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8/10/2019 ANSI Y14.7.2-1978
1/27
A M E R I C A NA T I O N A LT A N D A R D
ENGINEERING DRAWING ANDRELATED DOC UMENTATION PRACTICES
Gear and Spline Drawing Standards
Part 2-Bevel and
Hypoid
Gears
ANSI Y14.7.2
-
1978
~
-
SECRETARIAT
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
AMERICAN SOCIETY OF ENGINEERING EDUC ATION
SOCIETY OF AUTOMOTIVE ENGINEERS
P U B L I S H E D B Y
T H EA M E R I C A N O C I E T Y O F M E C H A N I C A L N G I N E E R S
U n i t e d n g i n e e r i n g e n t e r4 5
E a s t
4 7 t ht r e e t N ew York, N. Y. 0017
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REAFFIRMED 2004
FOR CURRENT COMMITTEE PERSONNEL
PLEASE E-MAIL [email protected]
8/10/2019 ANSI Y14.7.2-1978
2/27
ANSI Y14.7.2-1978
2
February 1978
ACCEPTANCE NOTICE
The above non-government Stand ardization Docu men t was ado pted on 2 February 1978 and is approved
for use by the DoD. The indicated industry group has furnished the clearances required by existing regula-
tions. Copies of the document are stocke d by DoD Single Stoc k Poin t, Naval Publications and Form s Cen-
ter,
Philadelphia, Pa., 19120 for issue
to
DoD activities only. Contractors and industry groups may obtain
copies directly from:
The American S ociety of Mechanical Engineers
345 E. 47th St . ,New Yor k, N.Y., 100 17 or
The American Natipnal Standards Institute
143 0 Broadway, New York , N.Y. 1001 8
Title
of
Docu men t: Gear and Spline Drawing Standards-Part
2
Bevel and Hypoid Gea rs
Docu men t No.: ANSI Y14.7.2-1978
Date
of
Specific Issue Ado pted : 17 Januar y 1978
Releasing Industry Group : T he American Society of Mechanical Engineers
Custodians;:
Army
-
AR
A i r
Force
-
16
Navy - AS
User
Activities:
Army - AR, AV, AT, EL, E, MI
Navy
-
MC, OS SH , YD, AS
Air Forc:e -
16,
1 1
Military Coordinating Activity:
Army
-
AR
Project Number: DRPR-019
No part of this document may be reproduced in any form, in an electronic
retrieval system or otherwise, without the prior written permission of the
publisher.
THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
Copyright 1978 by
All Rights Reserved
Printed n U.S.A.
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FOREWORD
For many years there was a growing desire for a national standard for engineering drawings, and as far
backasDecember1914ASMEapprovedandpubl ished he eportof tsCommit teeonStandards or
Cross-Sections.
The subject of standard practice was aid befor e the ASME Standardiz ation Com mittee in April 1925
and in May the ASME Counci l voted to appro ve the recomm endat ion .of the Comm it tee that the American
Standards Associat ion be requested to authorize the organizat ion of a nat ional ly representat ive commit tee
under its procedures t o develop standards for drawings and drafting room practice. This recommendation
was considered favorably and a preliminary conference was called by the ASA for October 14, 192 5, and a
general conference for December4 , 1 9 2 5 .
At the meet ing of the ASA Standard s Coun ci l , Decem ber 1925 , the project was f inal ly approved, t s
scope was out l ined, and the Society for the Promotion of Eng ineering Educat ion and the Am erican Society
of Mechanical Engineers were designated as joint sponsors. The organization meeting of the sectional com-
mit tee was held September 24, 1926, a t which Dean Frankl in deR. Furman was elected chairman. Subse-
quent ly s ix subcommit tees were appointed. These subcommit tees undertook the formulat ion of tenta t ive
drafts of the several sections of the final report which were distributed for criticism and comment.
In the spr ing of 1931 an Edi t ing Commi t t ee , Dr . Thomas E . F rench , Cha i rman, combined and ha rmo-
nized th e final reports of the several subcommittees. The proposed standard was approved by the sectional
commit teeand was subsequentlyapprovedby he ponsor ocietiesand ransmit ted o heAmerican
Standards Association for approval and designation as an American Stan dard, a status which was granted in
May, 1935.
The sect ional commit tee authorized the revis ion of the American Standard in Decembe r, 1940, and the
Subc omm it tee on Revisionwas appointed n September, 1941. A draft dated August , 1944 received the
approval
of
the sectional commit tee . The proposal was subsequen t ly submit ted to the sponsors and to the
American Standards Association for their approval. This approval with designation as an American Standard
was received
on
Apri l 12, 1946.
In 1948, the scope of the projectwas enla rged , and a revision was b egun in view of th e inc rease d dra fting
standardization work in Great Britain and Canada. An Execut ive Commit tee was formed in 1 949 to sup er-
vise th e wor k. It was decided to publish the eventual revision in separate sections. Upon completion and
sect ional commit tee approval of the las t of the f i rst s ix sect ions, they were sent o sponso rs a nd to ASA for
approval.Succeedingsections , as approved by he sect ional commit tee were subsequent ly submit ted o
sponsors
and ASA.
A section, Gears, Splines and Serrations, Y14.7, was approved and published as an American Standard
o n A p ri l 8 , 1 9 5 8 .
Recognizing the need for a universal gear draf ting stan dard , a C OR C om mitt ee as organized, in Decem-
ber 1961 , for the purpo se of coordinat ing the views of the SAE, Y14, the Mil i tary and the AGMA on a
draftin g standard for gears which could provide a fundam ental docum ent for wide national use of all inter-
ested parties.
I t was recommend ed by the SAE Drawing Standards Comm it tee and concurred in by the members of
the COR co mmit tee that this sect ion be divided into parts wi th Part covering spur, helical , double-hel ical ,
and rack gears, Part
2
covering bevel and hypo id gears, Part 3 covering crossed helical gears, worm gears,
Spiroid and Helicon gears, and Part 4 covering splines.
After e ight meet ings , the COR Comm it tee was incorpo rated into Subco mmit tee7 of S tandards Commi t -
tee Y14. Many drafts were c i rcula ted among the members of AG MA, AOA, SAE, Y14 and the Mil i tary for
suggestions and criticisms.
iii
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During this time the American Standards Association became the United S tates
of
America Standards
Institute and,. as
of
October 6, 196 9, the American National Standards Institute, Inc. In addition, he
Society of Autom otive Engineers became a cospon sor, along with the ASEE an d the ASME
of
all
Y14
Drafting Practices.
Part1 was designated an American National Sta nda rdon November 1,1971. This section covering
Part
2
received the approval
of
the Y14 Standards Comm ittee and was subsequently approved by the spon-
sor societies a nd sub mi tted to the American National Standards Institute. It was designated an American
National Standard on 17 January, 1978.
iv
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AMERICAN NATIONAL STANDARDS COMMITTEE
Y14
Engineering Draw ing and Related Documentation Practices
The fo l lowing s t he Ros ter of t h e C o m m i t t e e a t t h e t i m ef approval
of
t h i s S t andard)
OFFICERS
R . F. Franciose Chairman
C. W.
Stockwell Vice Chairman E.
L.
Kardas Vice Chairman
C. J. Gomez Secretary
COMMITTEE PERSONNEL
AMERICAN GEAR MANUFACTURERS ASSOCIATION
G.
L. Scon American Gear Manufacturers Associat ion, Washington, D.C.
AEROSPACE 1NDUSTRIES.ASSOCIATION OF AMERICA, INC.
R.
E.
Linse, North American Rockwell Corporat ion, El Segundo, Cal i fornia
R. C. Robley, Westinghouse Electr ic Corporat ion, Electura Systems Support D ivis ion, Hunt Val ley, Maryland
AMERICAN NSTITUTE FOR DESIGN AND DRAFTING
f . A. Saint, Kansas Gas Electr ic Company, Wichi ta, Kansas
AMERICAN SOCIETY FOR ENGINEERING EDUCATION, THE
R. W. Bokenkamp, University of Illinois, Urbana, Illinois
K.
E.
Botkin, Purdue Un ivers i ty, Lafayet te, Indiana
W . J. Luzadder, Purdue U nivers i ty, Lafayet te, Indiana
C. H. Springer, No. F or t Myers , Flor ida
AMERICAN SOCIETY
O F
CIVIL ENGINEERS
f
. Kircher, Malcolm Pirnie, Inc., White Plains, New Y ork
AMERICAN SOCIETY O F HEATING, REFRIGERATING AIR CONDITIONING ENGINEERS
fr it z Honerkamp, Anemostat Corp. of America, Scranton, Pennsylvania
H. J. Donovan, Alternate, Carr ier Corporat ion, Syracuse, New York
N. A. Lacourte, Alternate, AmericanSocietyofHeat ing,Refrigera ting Air Cond itioningEngineers ,NewYork,
New York
AMERICAN SOCIETY
OF
MECHANICAL ENGINEERS, TH E
A. R. Machell, Jr., Xerox Corporat ion, Rochester , New York
ff. . Spalding, Urbana, Illinois
ASSOCIATION OF AMERICAN RAILROADS
M. f McCorcle,
St.
Louis-San Francisco R ailway, Springfield, Missouri
BRITISH STANDARDS NSTITUTION
C. R. Austin, Liaison, Rolls Royce, Ltd. , Derby, Ihgland
COMPUTERS AND BUSINESS EQUIPMENT MANUFACTURERS ASSOCIATION
W.
M. Souza, IBM Corporat ion, San Jose, C al i fornia
CANADIAN STANDARDS ASSOCIATION
f Rowland Hi //, Liaison, St . Cather ines , Ontar io , Canada
CONSTRUCTION INDUSTRIES MANUFACTURERS ASSOCIATION
L.
R. Srrang, Caterpi l lar Tractor Company, East Peor ia, I l l inois
P.
McKim, Alternate, Caterpi l lar Tractor Company, East Peor ia, I l l inois
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ILLUMINATING ENGINEERING SOCIETY
L.
E.
Barbrow; National Bureau of Standards , Washington, D.C.
J.
E.
Kaufman, Alternate, I l luminat ing Engineer ing Society, New York, New Y ork
I N S T I T U T E O F E L E C T R I C A L E L E C T R O N IC S E N G I N E E R S , T H E
C.
R. Muller,
The Ins t i tute of Electr ical Electronics Engineers , New York, New York
C.
A. Fricke, Alternate,
Aeronutronics-Ford Corporat ion, Wil low Grove, Pennsylvania
MANUFACTU RING CHEMISTS ASSOCIATION
John B erts, Jr., E.I . DuPo nt de Nemo urs Company, Wilmington, Delaware
MOTOR VEHICLE MANUFACTURERS A SSOCIATION
J. H. Venema,
Ford Motor Company, Dearborn, Michigan
NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION
R.
F.
Franciose, General Electr ic Company, Eng ineer ing Standards and Specif icat ions , San Jose, Cal i fornia
R.
L Mancini, Alternate, National Electr ical Manufacturers Associat ion, New York, New York
NAT IONAL FLUID POWER ASSOCIATION
J.
L.
fisher, Jr., Bellows Valvair, A kron, Ohio
NATIONAL MACHINE TOOL BUILDERS ASSOCIATION
L G. Glesmann, Gleason Works , Rochester , New York
SOCIETY O F AUTOM OTIVE ENGINEERS
G.
M.
Garcina,
All ison Divis ion, General Motors C orporat ion, Indianapol is , Indiana
E. L.
Kardas, Prat t Whitney Aircraf t , East Har t ford, Connec t icut
J.
E.
Long,
General Motors Corporat ion, Warren, Michigan
C.
W. Srockwell,
Internat ional Harvester C ompany, Hinsdale, I l l inois
L.
V.
Porrer, Alternate, General Electr ic Company, Lynn, Ma ssachuset ts
. H. E. Guetzlaff, JohnDeereWater looTractorWorks ,Water loo , owa
S O C IE T Y O F M A N U F A C T U R I N G E N G I N E E R S
Joe Fenn, Indianapol is , Indiana
SOCIETY O F NAVAL ARCHITECTS AND MARINE ENGINEERS
G. R. Daniels,
Quincy, M assachuset ts
TECHNICAL DESIGN ASSOCIATES
R. L. Vanderzille, Eastman Kodak Comp any, Rochester , New York
R .
E.
Nisfa, Alrernare, Combust ion Engineer ing, Ihc. , Windsor , Con nect icut
TELEPHONE G R O U P
H.
A. Spielman,
Western Electric Company, New York, New York
R.
E,
Thiemer, Bell Telephone L aborator ies , Holmdel , New Jersey
A. Maone,
Western Electr ic Co., New York, New York
TRADE AND HIGH SCHOOL GROUP
Frank Scott, Belleville Juni or Co llege , Belleville, Illinois
U.S. DEPARTMENT OF
T H E
A R M Y
U.S . D E P A R T M E N T
O F
C O M M E R C E
M . E. Taylor,
Army Armament Research and Development Command, Dover , New Jersey
D.
M,
Mills, Patent Off ice Draf t ing Branch, Washington, D.C.
INDIVIDUAL MEM BERS
Burt Brown,
General Dynamics Corporat ion, For t Worth, Texas
H . L Dubocq, Grumman A erospace Corpora tion , Bethpage, New Y ork
J. J. Duero, A. 0 mith Corporat ion, Milwaukee, Wisconsin
R. J. Dybas, Bell AerosystemsCompany, Buffalo, New York
C.
J. Fausf, Lycoming D ivis ion, AVCO Corporat ion, Strat ford, Connect icut
G. J. Fisher, Thiokol Chemical Corporat ion, Rr igham City, Utah
t R. D. Furay, Vought Systems D ivis ion, LTV Aerospace Corporat ion, Dal las , Texas
* E . E. Heibeck, Chrysler Corporat ion, Detroi t , Michigan
E.
w
Lewis,
Chevrolet Divis ion, General Motors Corporat ion, Warren, Michigan
R. E.
Moore, Cessna Aircraf t Company, C ommercial Aircraf t Divis ion, Wichi ta. Kansas
tS.
H. Watson, Haddo nfield, New Jersey
vi
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PERSONNEL O F SUBCOMMITTEE 7 GEARS AND SPLINES
J. E.
Long, Chairman,
General Motors Corporation Warren Michigan
W.
M. Ahern, Internat ional Harvester Company Melrose Park Illinois
Roland Barlow, Ex-Ce1l-O Corporation Walled Lake Michigan
R.
J.
Belansky,
Illinois Tool Works Chicago Illinois
K .
E.
Botkin,
Purdue University Lafayette Indiana
P.
M.
Dean,
Mechanical Technology Incorporated Latham New York
Erwin F Geppert,
U.S.
Army Tank Automotive Command Warren Michigan
J.
J.
Knopp, Gleason Works Rochester New York
Robert K oehler,
Milwaukee Gear Company Milwaukee Wisconsin
J. f Kothman,
General Electric Company Lynn Massachusetts
C.
J. Krzyszczak,
Fruehauf Corporation Warren Michigan
V.
A. Lenar,
Oak Park Michigan
E. J.
Margavich,
U.S. Army Tank Automotive Command Warren Michigan
Thaddeus Pietrykowski, U.S.
Army Tank Automotive Command Warren Michigan
Thomas Raye, Raska Spline Products Company Warren Michigan
C. K
Reece,
John Deere Waterloo Tractor Works Waterloo Iowa
G. J. Schmidt (Alternarel, Illinois
Tool
Works Chicago Illinois
G. L. Scott,
American Gear Manufacturers Association Washington D.C.
D. L. Thurman,
Caterpillar Tractor Company East Peoria Illinois
J.
T. Wilson, Ford Motor Company Warren Michigan
tC. A. Nazian,
Frankford Arsenal Philadelphia Pennsylvania
W
L. Tuschak,
General Motors Corporation Ypsilanti Michigan
CONSULTANTS
tWells Coleman, Rochester New York
t h i n Grif f i th, Birmingham Michigan
tC.
H. Parker,
North Springfield Vermont
t R .
F. Zogbaum, Jr.,
East Hartford Connecticut
D. W. Dudley,
International Harvester Company San Diego California
t
Retired
*Deceased
vii
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CONTENTS
Subsection Page
1 Scope
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2urpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3General Drawing Practice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Gear Drawing Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
Dimensioning
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DrawingFormat
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DrawingTitle
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Straight Bevel Gear Teeth
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Spiral Bevel Gear Teeth
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Angular Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hypoid Gear Teeth
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MatchedSets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5Gear To oth Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
5.1 1
5.12
5.13
5.14
5.1
5
Axialplane
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PitchPlane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transverse Plane
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NormalPlane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MeanPoint
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ToothTrace
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diametral Pitch
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PressureAngle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tange nt Plane
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Metric)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SpiralAngle
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hand
of
Spiral
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hypoid Pinion Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Direction
of
Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T o o t h F o r m
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 5.1 Gene rated . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1
5.2 Non-Generated
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.15.3 CONIFLEX@ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.15.4 REVACYCLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.15.5FORMATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 5.6 HEL IXFO RM a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.15.7 ZEROL@ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.16 Depthwise To oth Taper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.17 Clearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
9
9
9
9
9
9
9
9
9
9
9
10
10
10
10
10
10
10
10
10
10
1 0
10
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Subsection Page
5.18
5.19
5.20
5.21
5.22
5.23
5.24
5.25
5.26
5.27
5.28
5.29
5.30
5.3
1
Baclilash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0
5.18.1 Backlash Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 0
5.18.2 Backlash Variation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
5.18.3 Backlash Variationolerance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Circularhickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10
Measuring Addendum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Measuring Thickness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 1
Mean Measuring Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Runout Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1
Pitch Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Index Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
.Com posite Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Tooth Surface Texture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
AGMA Quality Class
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
V a n d H C h e c k . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Face Angle Distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1
BackAngle Distance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
11
Figures
1 Straight Bevel Gear/Pinion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2
2 Data Specifications for Straight Bevel Gears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3piral Bevel Gear/Pinion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
4 Data Specifications for Spiral Bevel Gears . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5ypoid Pinion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
6 HypoidGear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
8 DataSpecifications for Bevel Gear Matched Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9 Bevel GearNomenclature-Axial Plane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
10
Hypoid Gear Nom enclature-Ax ial Plane
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14
11
Bevel GearNom enclature-Tra nsverse Plane atOutsideDiameter . . . . . . . . . . . . . . . . . . . . 1 5
12 Bevel Gear Nom enclature-No rmal Plane at he Mean Point . . . . . . . . . . . . . . . . . . . . . . . . 16
13 Mean Spiral Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
14
Pressure Angle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
15 Hand
of
Spiraland Pinion Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
.
7
Data Specifications for Hypoid Gears
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
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ANSI Y14.7.2-1978
AMERICAN NATIONAL STANDARD
ENGINEERING DRAWING AND RELATED DOCUMENTATION PRACTICES
Gear and Spline Drawing Standard
Part 2 for Bevel and Hypoid Gears
1
SCOPE.
This standard establishes me tho ds o be
followed in specifying drawing data for gears with in-
tersecting axes bevel gears), and non-pa rallel, non -
intersecting axes hyp oid gears). It also discusses the
method
of
specifying ma tched sets on a gear drawing.
2 PURPOSE. The purpose of this standard is to es-
tablish engineering drawing tandards which define he
finished prod uct or he following types of gears:
straight bevel, spiral bevel, and hypoid.
3 GENERAL DRAWINGPRACTICES. General draw-
ing practices re covered in ANSI Y14.1 throug h
ANSI Y14.5 of these AmericanNational Standards
for Engineering Drawing and Related Documentation
Practices. For he particularpractices, refer to he
applicable standard.
4 GEAR DRAWING PRACTICES.
Illustrations of
various gear con figu ratio ns are provided for guidance
only and are not manda tory.
4.1 Dimensioning.
Illustrations howonly hosedi-
mensions which cont rol the gear teeth and their
rela-
tion to the mo unting surfaces. Dimensional values are
indicated by Xs to show the numberf de cimal places
recommended in each instance.
4.2 AngularDimensions. All angulardimensionsare
expressed in degrees and decimal portion s hereof.
Specification of angles in degrees, minutes,nd
seconds is optional.
4.3 Drawing Format.
A gear drawingconsists of a
side view or axial section illustrating the general con-
figuration and tabulated gear tooth data. A front view
is used where necessary to sho w relationship of the
gear te eth oother eatures.Location of tabulated
gear tooth data s optional.
4.4 Drawing Title. For dentification purposes, the
title should include the word pinion or gear as appli-
cable.
4.5 Straight Bevel Gear Teeth
4.5.1 Straight bevel gear and pinion teeth are drawn
as shown in Figure 1. The mou nting distance shown
on the drawing is an assembly dimension and is speci-
fied as a reference dimension.
4.5.2 Gear datanot included n Figure 1 are tabu-
lated on the drawing as shown in Figure 2. The draw-
ingmust also show material nd eat treatme nt
specifications.
4. 6 Spiral Bevel Gear Teeth
4.6.1 Spiral bevel gear andpinion teeth are drawn
as shown in Figure
3 .
4.6.2 Gear d ata no t illustrated in Figure
3
are tabu-
late d o n the drawing as shown in Figure 4. T he draw-
ingmust also show material and heat treatme nt
specifications.
4.7 Hypoid Gear Teeth
4.7.1
Hypoid pinion and gear teeth are drawn as
shown in Figures 5 and 6 respectively.
4.7.2 Gear da ta not included in Figures 5 and 6 are
tabulatedon he drawingasshown in Figure
7.
The ~
drawing must also show material and heat treatm ent
specifications. Distances from the pitch apex
for
the
gear m ember only, face apex, and root apex o he
crossing point centerline of the mating memb er) are
included as reference dimensions. Values are positive
when the apex is beyondhe crossing point and
negative when the apex lies between the gear and
crossing point. Thepitch diameter and pitch angle
are specified on the gear membe r o nly.
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AMERICAN NATIONAL STANDARD
GEAR AND SPLINE DRAWING STANDARD
PART 2 FOR: 3EVEL AND HYPOID GEARS ANSI Y14.7.2-1978
A
x.xxx
.;/
L EA CH RAD I AL L EMENT
. xxx
+ . X X X )
. xxx
X . X X X X )
-Mounting Distance-
1 .
When face angle distance and back angle distance see
FIG. 9)
are used f or dimensioning the gear blank, the face
angle alnd the back angle should be given as reference dimension s on the drawing, wit hout a t olerance.
FIG. 1 STRAIGHT BEVEL GEAR/P INION
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AMERICAN NATIONAL STANDARD
GEAR AND SPLINE DRAWING STANDARD
PART 2
FOR
BEVEL AND H Y P O I D GEARS
ANSI Y14.7.2-1978
NUMBER OF TEETH
DIAMETRAL PITCH'
PRESSURE ANGLE
PITCH DIAMETER
ADDENDUM
WORKING DEPTH
WHOLE DEPTH
THEORETICAL OUTSIDE DIAMETER
THEORETICAL CROWN TO BACK
PITCH ANGLE
ROOT ANGLE
CIRCULAR THICKNESS
MEAN MEASURING ADDENDUM
MEAN MEASURING THICKNESS
NORMAL BACKLASH WITH MATE
BACKLASH VARIATION TOLERANCE3
SHAFT ANGLE
FILLET RADIUS
RUNOUT TOLERANCE3
PITCH TOLERANCE3
INDEX TOLERANCE3
TOOTH SUR FACE TEXTURE
AGMA QUALITY CLASS
TOOTH FORM
DRIV ING MEMBER
DIRECTION OF ROTATION
MFG SUMMARY NUMBER
PART NUMBER OF MATE
NUMBER OF TEETH IN MATE
xx
(XX.XXX)
(XX.XX )
(X.XXXX)
(.XXXI2
(.XXXI2
.xxx-.xxx2
(X.XXX)2
(X.XXXI2
( x x . x x o ) 2
(XX.XX0)
. xxxx )2
. xxx2
.xxx - .xxx2
.xxx- .xxx2
. x x x x
(XX.XX )
. x x x - . x x x 2
. xxxx
. xxxx
.xxxx
XX AA
OR
R a
x x
CONIFLEX@ OR
REVACYCLEa
PINION
OR
GEAR
CW AND/OR CCW
xxxxxx
x x x x x x
x x
2. Formetric drawings, the number of d ecimal places to the right of the decimal point should be reduced by one.
1 .
Formetric
drawings, specify module in plac eof diametral
pitch. (See 5.9).
3. See 5.18.3. 5.23, 5.24, 5.25and 5.26 concerning when to
specify these values on the gear drawin g.
FIG. 2 DATA SPECIFICATIONS FOR STRAIGHT BEVEL GEARS
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AM E RI CAN NAT I ONAL S T ANDARD
GEAR AND SPLINE DRAWING STANDARD
PART 2 FOR BEVEL AND HYPOID GEARS
x.xxx
A
x .xxx
x.xxx
f
ANSI Y14.7.2-197
Axis of Mating Mem,ber
xx.xx0
-xx.xxo
J
X.XXXX)
-
ounting Distance
1. When face angle distance and back angle distance (see FIG.
9)
are used for dimen sionin g the gear blank , the face
angle and the back angle should be given
as
reference dimensions on the drawing, without a olerance.
FIG. 3 SPIRAL BEVEL GEAR/PINION
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8/10/2019 ANSI Y14.7.2-1978
15/27
A M E R I C A N N A T I O N A L S T A N D A R D
GE A R A N D S P L I N E D R A W I N G S T A N D A R D
P A R T 2
FOR
B E V E L A N D HYPOID GE A R S
ANSI Y14.7.2-1978
x.x:xxx
Q x.x.xxx- : : : : q q
.xxx
. X X X )
Axis of Mating
Member
( x.xxx x
)
Mounting Distance
E A C H R A D I A L E L E M E N T
1. Whe n face angle distance and back angle distance (see FIG. 9) are used for dimensioning the gear blan k, the face
angle and the back elngle should be given as reference dimensions on the dra win g, w ith out tolerance .
FIG.
5
HYPOID
PINION
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AMERICAN NATIONAL STANDARD
GEAR AND SPLINE DRAWING STANDARD
PART 2
FOR
BEVEL AND HYPOID GEARS ANSI Y14.7.2-1978
xx
x x
1 .
When face angle distance and back angle distance (see
FIG. 9)
are used for dimensioning the gear blank, the face
angle and the back angle should be given as reference dimensions on the draw ing, with outa tolerance.
FIG. 6
HYPOID
GEAR
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AM E RI CAN NAT I ONAL S T ANDARD
GEAR AND SPLINE DRAWING STANDARD
PART 2 FOR BIEVEL AND HYPOID GEARS
ANSI Y14.7.2-1978
NlJMBER OF TEETH
DIAMETRAL PITCH'
- NORMAL PRESSURE ANGLE-GEAR CONVEX
GEAR CONCAVE
MEAN SPIRAL ANGLE
HAND
OF
SPIRAL
PINION OFFSET
DIRECTION OF OFFSET
PITCH DIAMETER (GEAR ONLY)
ADDENDUM (GEAR ONLY)
WORKING DEPTH
WHOLE DEPTH
THEORETICAL OUTSIDE DIAMETER
THEORETICAL CROWN TO BACK
PITCH ANGLE (GEAR ONLY)
ROOT ANGLE
FACE APEX TO CROSSING POINT
PITCH APEX TO CROSSING POINT (GEAR ONLY)
ROOT APEX TO CROSSING POINT
MEAN MEASURING ADDENDUM
MEAN MEASURING THICKNESS
MEAN MEASURING DEPTH
NORMAL BACKLASH WITH MATE
BACKLASH VARIATION TOLERANCE3
SHAFT ANGLE
FILLET RADIUS
RlJNOUT TOLERANCE3
PITCH TOLERANCE3
INDEX TOLERANCE3
TOOTH SURFACE TEXTURE
AGMA QUALITY CLASS
TOOTHFORM
DRI VING MEMBER
DIRECTION OF ROTATION
MFG SUMMARY NUMBER
PART NUMBER OF MATE
NUMBER OF TEETH IN MATE
xx
(XX.XXX)
(XX.XX )
(XX.XX )
(XX.XX )
LH OR RH
(X.XXX)
AC ORBC
(X.XXXX)
.xxx)2
(.XXXI2
( . xxx )2
x.xxx)2
( x . x x x ) 2
(XX.XX )
(XX.XX )
( . xxx )2
(.XXXI2
(.XXXI2
. xxx
.xxx-.xxx
.xxx-.xxx
.xxx-.xxx
.xxxx
.xxx-.xxx
(XX.XX )
.xxxx
. x xxx
. xxxx
XX AA OR
R a
xx
GENERATED OR
FORMATE@ OR
HELIXFORMB
PINION OR GEAR
CW AND/OR CCW
xxxxxx
x x x x x x
xx
V AND t i CHECK I N THOUSANDTHS OF AN INCH (OR HUNDREDTHS OF A MILL IMETER)
FOR FINISHED GEARS4
GEAR CONVEX
TOTAL HEEOE
EAR CONCAV'E
OTAL HEEL
OE
V
xx
x
xx
x
x
H
x x
xx
xxx
1. For metric drawings, specify module in place of diametral pitch. (See 5.9).
2. For metric drawings, the number of decimal places to the right of the decimal pcint should be reduced by one.
3. See 5.18.3, 5.23 , 5.2 4, 5. 25 an d 5.2 6 con cerning when to specify ihese values on the gear drawing.
4.
May be optional for matched sets. Specify on matched set drawing. See FI G. 8.
FIG. 7 D A T A SPECIFICATIONS FOR HYPO ID GEARS
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AMERICAN NATIONAL STANDARD
GEAR AND SPLINE DRAWING STANDARD
PART 2 FOR BEVEL AND HYPOID GEARS ANSI Y14.7.2-1978
4.8 Match ed Sets.
5.5 Tangent Plane. A plane tangent to the tooth sur-
4.8.1 Bevel and hypoid gears are frequen tly match ed
face at a point
Of contact . As used in the
in sets or pairs during sequence of the manufacturing
the
tangent piane is taken at the mean point-
Process. They aremaintained as a matc hed set in
5.6 Mean Point. The point on the intersection of the
assembly. See Figure
8.
too th surface with the pitch surface at the middle
of
4.8.2 Gear sets which have a comm on facto r in the the theoretica l face width of a bevel
or
hypoid gear.
toothnum bers of pinion and mating gear have a
See Figures
9
and 13.
specific marking
on
mating
teeth to 5.7 Tooth Trace.
Thefntersectionetween
of the gears as originally matched. See Figure
8.
the pitch surface an d the tooth surface. See Fieure 13.
4.8.3
Drawings for gears which operate as matched
sets shall contain the following note:
5.8 Diametral Pitch. The ratio of the number of teeth
to the pitch diametern inches. Unless otherwise spec-
THIS GEAR
IS
PART O F A MATCHED
ified , the transverse diametral pitc h specified in the
SET WITH MATE NO. XXXXXX.
transverse plane) is implied. For hypoid gears, it is the
EACH MATCHED SET IS TO BE MAIN-
transverse diametral pitch of the gear member.
TAINED AS A S ET AFT ER IDENTITY
5.9 Module Metric). The ratio of the pitch diameter
IS
DETERMINED. MARKED TEETH
in millimeters to the num ber of teeth . Unless othe r-
BLED AS SHOWN. transverse plane) is implied. For hypoid gears, it is the
NON-HUNTING) MUST
BE
ASSEM-ise specified, the transverse mo dule specified in the
transverse module o f the gear mem ber.
5 GEAR TOOTH NOMEN CLATUR E. The following
gear tooth nomenclature,is intended toamiliarize the
draftsm an with eneral terms used on thegear drawing.
Amore completeexplanationof erms, definitions
and llustrations is given in Ame rican National Sta n-
dard for Gear Nomenclature, ANSIlAGMA 112.05-
1976, published by the American G ear Manufacturers
Association, 1330 Massachusetts Avenue , N.W. Wash-
ington, D.C.
5. 10 Pressure Angle.
The angle at the pitch point be-
tween a line normal to the too th profile and th e pitc h
plane. See Figure 14. Unless otherwise specified for
bevel andhyp oid gears, the norma l pressure angle
measured in the norm al plane at the mean point) is
implied. The normal pressure angle is that angle in the
normal plane at the pitch point between the tangent
plane and a radial line to the gear center. On most
types of gears the pressure angles on bot h sides of the
5.1 Axial Plane.
A plane which contains the gear axis.
gear to oth profile are equal. An e xcep tion to this is in
Figure
9
illustrates the gear nomenc lature in the axial designs of gears with buttress teeth such as hypoids.
plane of a bevel gear and Figure 10 lower view) illus-
Hypoid gear teeth , because of their asym metric rela-
trates a view in the axial plane
of
a hypoid gear.
tionsh ip, do not naturally have equal pressure angles
on their tw o sides. With spiral bevel gears, the designer
5.2 Pitch Plane- A Plane tange nt o he gear Pitch may eliberately nbalance the pressure angles to
surface. For bevel gears, thePitch Plane is tang ent oproduce abuttressed too th. On spiral bevel and
theitch cone. hypoid gears, theeeth
are
cutith lengthwise
curva-
5.3 TransversePlane. A plane perpendicular to bo th
the axial plane and thepitc h plane. Figure illus-
trates he gear nome nclature in the transverse plane
ture. One too th surface is concave; the othe r is con-
vex. These two erms are used to dent ify he two
sides of the gear teeth. See Figure 13.
of a bevel gear. 5.11 Spiralngle. The angle between th eooth trace
5.4 Norm al Plane. A plane perpendicular to the pitc h
plane and containing a line norma l to the tooth
sur-
face at the pitch point . n bevel gears, it usually refers
to he plane which passes through the mea npoint
and an element
of
the pitch cone. See Figure
13.Un
less otherwise specified, the spiral angle is at the mean
point. On hypoid gears, the spiral angles on gear and
mating pinion are unequal.
the section at the cent er of the face width). Figure
5.12 Hand
of
Spiral. The direction of inclination of
12 illustrates the gear nomenclature in the normal
the teeth as viewed by an observer looking at the face
plane of a bevel gear.
of he gear. A eft-hand spiral is one in which the
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A M E R I C A N N A T I O N A L S T A N D A R D
G E AR A N D S P L I N E D R A W I N G S T A N D A R D
P A R T
2 FOR
B E V E L A N D H Y P O I D G E A R S
outer half of t.he teeth are inclined in a counter clock-
wise direc tion; a right-hand spiral is one in which the
outer half of the te eth are inclined in a clockwise di-
rection. See Figure 15. With the excep tion of a few
relatively rare hypoid gear designs, a gear and mating
pinion have opposite hands of piral.
5.13
HypoidPinionOffset. Th e perpendicular dis-
tance between the axes
of
a hypoid gear set. Hypoid
gears and pinions, in Figure 15 a) a nd b) are referred
to as having a pinionoffset below cen ter, while
those in Figure 15 c). and d) have apinionoffset
above center. The direction of pinion offset is de-
termined where viewing the face of the gear with the
pinion at the r:ight.
5.14 Direction
of
Rotation. The direction
of
rotation
is determined where viewing the gear or pinion from
its back. The direction of rotation
of
gear and mating
pinion are eithe r clockwise or counterclockw ise and
always opposite to each other.
5.15 Tooth Form. The shape
of
the oot h profile.
Since bevel and h ypoid gears are manufa ctured with a
variety of tooth form s, t is essential to specify the
desired f orm on the gear drawing.
5.15.1
Generated.
A
tooth orm where both mem-
bers have too th profiles roducedwith relative
motion between thecutting ool and the work n
addition
to
the: cutting action.
5.15.2. Non-Generated.
A
tooth form where the gear
too th profile is produc ed without a generating motion
betw een the wtting tool and the work. The mating
pinion m ust be: generated.
5.15.3 CONIFLEXO.
A
trade nam e applied to gen-
era ted straight bevel gears whose tee th have lengthwise
crowning.
5.15.4
REVACYCLEO.
A
trade name pplied to
straight bevel gears produc ed with circular arc too th
profiles.
5.15.5 FORMATE@. A
trade nameapplied to
non-
generated spird and hypo id gears in which th e too th
profiles are straight. The matingpinions are generated
to be conjugate to the gears.
5.15.6 HELIX:FORM@. A trade name applied to
non-gene rated spiral bevel and hypo id gears in which
the too th surfaces are helicoidal in fo rm.
5.15.7 ZEROLO.
A
tradename applied to spiral
bevel gears with ero spiral angle at some point
a lo ng t he t o o ~ hength.
10
ANSI Y14.7.2-1978
5.16 Depthwise Tooth Taper. The difference in
tooth d epth at th e inner and outer ends of the teeth.
Standard depthwise tooth taper refers to gears in
which th e tooth dep th is pro[.
r t i rna l
to the distance
from the pitch apex. Zero depthwise aper refers to
teeth with constant depth. Frequen tly conical gears
are designed with tilted root lines.This generally
refers to a depthwise too th taper which
is
deeper at
the outer end
of
the tooth and shallower at the inner
end of the ooth han hat resulting fromstandard
taper. T ilting the root lines is don e o improve the
point width of the c utting ools.
5.17 Clearance. The space between the op land of
the tooth of one gear and the root land of the mating
gear. See Figures
11
and 12.
5.18 Backlash. The space between m ating tooth sur-
faces. For purposes of measurement and calculation ,
backlash is the amoun t by which the width of a too th
space exceeds the thickness of an engaging tooth.
Numerical values of backlash on bevel andhypoid
gears are measured at he ightest point of mesh on
the pitch circle at he outer end of the ooth with
gears assembled at their specified moun ting distances.
See Figure 12. Unless otherwisespecified, the term
backlash denotes normalbacklash; tha t is, backlash
measured in a direction perpendicular to he oot h
surface.
5.18.1
BacklashTolerance. The allowable
variation
in the backlash measured at the tightest point
o f
mesh
among all pairs of gears of a given population as a
result of oot h size variation. Backlash tolerance is
used as a con trol of tooth size in produc tion and is
specified on the drawing.
5.18.2
Backlash V ariation. The difference nback-
lash between the tightest and loosest points of mesh
in one pair of gears as a result of runo ut, inde x varia-
tion, and profile variation.
5.18.3 Backlash VariationTolerance.The.allowable
variation i n backlash in a single pair of gears. Backlash
variation tolerance is only specified if backlash varia-
tion is critical.
5.19 Circular Thickness. Th e eng th of arcbetween
the wo sides of a gear toothon hepitch circle.
Unless otherwise specified, it is the transverse circu-
lar thickness t theouter nds of the eeth. See
Figure 11 .
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AM E RI CAN NAT I ONAL S T ANDARD
GEAR AND SPLINE DRAWING STANDARD
P ART
2 FOR
BE V E L AND HY P OI DGEARS
ANSI Y14.7.2-1978
5.2 0 Measuring Addendum. The height from the top
of he ooth o hechordsubtending he circular-
thickness arc in the norm al plane. The mean measur-
ing addendum is the value at the center of the tooth
length.
5.21 MeasuringThickness.
The length of thechord
subtending aircular-thicknessrc in the ormal
plane. The mean measuring thickness is the value used
at the centerof the too th length.
5.2 2 Mean Measuring D epth. The dep th of the tooth
at the centerof the tooth length.
5.23 Run out Tolerance. The total allowable variation
of
the distance between a surface of revolution and
an indicatedsurfacemeasuredperpendicular to he
surface of revolution. Unless otherwisespecified, it
refers to radial runo ut of the gear teeth ; tha t is, in a
direction perpendicular to the axis of gear rotatio n.
This value is specified on he drawing when AGMA
quality class numbers are not available.
5.24 PitchTolerance. The allowable differencebe-
tween the pitch and h e measured distance between
any two adjac ent teeth. This value is specified on the
drawing for gears of high accuracy requirement.
5.25 Index Tolerance. The allowable displacement of
any tooth from its theoretical angular or linear posi-
tion relative to a d atu m to oth . This value is specified
on the drawing for gears used for accura te positioning,
such as ind ex drives.
5.26 Compositeolerance.
Tooth-to-toothom-
posite olerance and otalcomposite tolerancemay
be specified in place
of
runout toleranceand pitch
tolerance for gears
of 2
diametral pitch andfiner.
These values are specified on thedrawing when AGMA
quality
class
numbers
are
no t available.
5.27 Tooth Surface Texture.
The texture of the fin-
ish on the working tooth surface
of
a gear tooth; ex-
pressed either as an arithmetical average deviation
AA) or an arithm etical mean deviation Ra).
5.28 AG M A Qua lity Class.
The classification num ber
established by the American Gear Manu facturers As-
sociation to designate the quality requirements of a
gear. See AGMA 390. 03 JAN ., 1973-AGMA GEAR
HANDBOOK, VOLUME 1 , GEAR
CLASSIFICA
TION, MATERIALS AND MEASURING METHODS
FOR UNASSEMBLED GEARS.
5.29
V
and H Check. A check used for produc tion
control of the ooth contact pattern on gears after
sample gears have been established which are known
to functio n properly in the ap plication. The V and H
che ck gives the relative vertical V) andhorizontal
H)displacements on a estingmachine to position
the tooth contact pattern at both the inner toe) and
oute r heel) end of the tooth while maintaining the
contactpatte rn in the middle of he ooth profile.
For control purposes, theoothontact attern
shouldduplicate thepatternon thesample pair
of
gears when similarly positioned in the testing machine .
These da ta are optio nal on a gear drawing and should
only be specified when a atisfactorydevelopment
has been achieved. See Figures
4
and 7.
5.30 FaceAngle -Distance. The perpendicular dis-
tance from the intersection of the gear axis with the
locating surface at the b ack of a bevel
or
hypoid gear
to the face cone elem ent. See Figures 9 and
10.
5.31 BackAngleDistance. The perpendicular dis-
tance from the intersection
of
the gear axis with the
locating surface at the back
of
a bevel o r hypoid gear
to the back cone element.
See
Figures 9 and
10.
11
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AMERICAN NATIONAL STANDARD
GEAR AND SPLINE DRAWING STANDARD
PART 2 FOR BEVEL. AND HYPOID GEARS
ANSI Y14.7.2-1978
Pinion and Gear to be
Matched in Pairs for Proper
Tooth Contact and
Backlash. Etch Serial
Number, Measured
Backlash and Measured
Mounting Distance
on These Surfaces.1
/
/ / .
Distance
C I X . X X X X l + P i n i o n
Mounting Oistance
DRIVING MEMBER PINION
OR
GEAR
DIRECTION OF ROT ATION CW AND/OR CCW
MFG x x x x x x
PART NUMBER OF DRIVER x x x x x x
PART NUMBER OF DRIVEN x x x x x x
V AND H CHECK IN THOUSANDTHS OF AN INCH OR HUNDREDTHS
OF
A MILLIMETER)
FOR FINISHED GEAR SET
GEARCONVEX
TOTAL
EEL
OE
EAR CONCAVE
OTAL
EEL
OE
V
x x
x x x
x
x
x
x x x x x x
x
x x x
MARKED TEETH MUST BE ASSEMBLED AS SHOWN
1. On even or m ultipl e ratios,
a
pair of meshing eeth should be etched
X
when in mesh in order that they may be
2. For metric drawsings, the number o f places to t he rig ht of the decimal p oint should be reduced by one.
assembled in the
same
running position as when manufactured. See Para.
4.8.2.
FIG. 8 DATA SPECIFICATIONS FOR BEVEL GEAR MATCHED SET
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A M E R I C A N N A T I O N A L S T A N D A R D
GE A R A N D S P L I N E D R A W I N G S T A N D A R D
P A R T 2 FOR B E V E L A N D
HYPOID
GEARS
ANSI Y14.7.2-1970
Mounting Distance
1. The pitch apex and the root apex m ay or may not coincide depending on individual gear design.
2. See Figure 11 for developed view of A-A.
FIG.
9
B E V E L GE A R N OME N C L A T U R E - A X IA L P L A N E
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AMERICAN NATIONAL STANDARD
GEAR AND SPLINE DRAWING STANDARD
PART 2
FOR
BEVEL AND HYPOID GEARS
Pinion Mounting Distance
-4
ANSI Y14.7.2-1978
utside Diameter
IG. 10 H Y P OI D GE A R N OME N C L A T U R E - A X I A L P L A N E
14
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A M E R I C A N N A T I O N A L S T A N D A R D
G E A R A N D S P L I N E D R A W I N G S T A N D A R D
P A R T 2
FOR
B E V E L A N D
HYPOID
GEA RS ANSI Y14.7 .2-1978
T , D e d e n d /
Distance
/.i
Circular Thickness
Top Land
Working DepthJ
I .
Root
Land
- Whole Depth .
Tooth Fi l let
Developed
View
at
A-A
See Fig. 9)
FIG.
11
BEVEL GEAR NOM ENCLATURE-TRANSVERSE PLANE AT OUTSIDE DIAMETER
15
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A M E R I C A N N A T I O N A L S T A N D A R D
G E A R A N D S P L I N E D R A W I N G S T A N D A R D
P A R T 2
FOR
B E V E L A N D H Y P O I D G E A R S
I Measuring
Normal
Thickness
Backlash
I
Measured Whole Dep th A
Measuring Addendum
1
FIG. 12 BEVEL GEAR NOMENCLATURE-NORMAL PLANE AT THE MEAN POINT
Element of Pitch Cone
Mean Point of Tooth
Ctonvex Side of Tooth
Tooth Trace
7
Section Through Tooth
on Pitch Cone
Concave Side
of
Tooth
1 1
Trace of Tangent Plane
FIG. 13; MEAN SPIRAL ANGLE
FIG. 14 PRESSURE ANGLE
16
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AM E RI CAN NAT I ONAL S T ANDARD
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PART 2
FOR
BE V E L AND HY P OI DGEARS
Offset
Offset
ANSI Y14.7.2-1978
b)
Offset
Below Center
LH
Pinion
R H
Gear
C )
Offset Above Center R H Pinion
LH
Gear
Offset
Offset
FIG. 15 H A N D
OF
SPIRAL AND P INION OFFSET
17
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