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है”ह”ह

IS 12587 (1989): Automotive Vehicles - Transmission System- Gear Arrangement - Recommendations [TED 2: AutomotivePrimemovers]

IS 12587 : 1989

Indian Standard

AUTOMOTIVE VEHICLES-TRANSMISSION -. , . , t ? SYSTEM-GEAR ARRANGEMENT- ._ RECOMMENDATIONS

. . . .

UDC 629’113-585

* -*, ’ I 6

. e’ DESCRIPTORS : AUTOMOTIVE VEHICLES - GEAR ARRANGEMENT IN TRANSMISSION SYSTEMS.

AUTOMOBILE TRANSMISSION SYSTEMS - GEAR ARRANGEMENTS.

. .-

@ BIS 1989

BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

October 1989 Price Group 3

Automotive Transmission Systems Sectional Committee, EDC 103

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards on 9 February 1989, after the draft finalized by the Automotive Transmission Systems Sectional Committee had been approved by the Mechanical Engineering Division Council.

This standard is one of the series of Indian Standards on the basics of automotive transmission systems and the arrrangement of gears in the transmissions. This standard will help to standardize the industry practice and help in clear understanding of the functional inter-relations of the gearing, clutches, hydrodynamic drive unit and other transmission components.

In the preparation of this standard, assistance has been derived from SAE J 647 June 198.5 ‘Transmissions - Schematic diagrams’, issued by the Society of Automotive Engineers Inc, USA.

AUTOMOTIVE

IS 12587 : 1989

Indian Standard

VEHICLES -TRANSMISSION SYSTEM -GEAR ARRANGEMENT-

RECOMMENDATIONS

1 SCOPE

1.1 This standard specifies through schematic diagrams, the gear arrangements in trans- mission systems of automotive vehicles.

1.2 F’or the purpose of clarity, the transmission in neutral and in gear have been illustrated.

2 TRANSMISSION IN NEUTRAL

2.1 Five Speed Countershaft Transmission

Fig. 1 illustrates five speed countershaft trans- mission which is constant mesh in all forward

. Each gear is identified according to the ~~f~cular transmission speed it provides when engaged, for example, first, second, third, etc. The numl>cr of teeth in each gear is indicated. Synchsonized and positive jaw clutches are schematically represented with a drive dog and mating slot in the affected gear. Two drive plates and one driven plate are used to desig- nate the plate clutch asseml,ly. The reverse idler gear is shown out of position for clarity.

2.2 Four Speed Planetary Gear Transmission

Fig. 2 illustrates a four speed planetary gear transmission in neutral with clutches and Lands shown disengagccl. Brake I,nnds and clutches are dcsignatccl as first, s~~oncl, third, reverse, etc, in accordance with their use. (iear sets are designated as Gl, G2, G3, etc. The number of teeth in each gear is also shown.

2.3 Three Speed Planetary Gear Transmission

Fig. 3 illustrat.cs a three speed p1anct;rt.y grar transmission wit.11 split torque path ;lntl cxtct n;tl gear final drive ( difii:rential is not illllstrated ).

2.4 Four Speed Two Axes Transmission

Fig. 4 illustrates a four speed transmission with chain drive connecting the two axes ( differen- tial is not illustrated ).

3 TRANSMISSION IN GEAR

3.1 Five Speed Countershaft Transmission

Fig. 5 illustrates the countershaft transmission in gear with the torque path denoted by straight bold arrows. Curved arrows indicate direction of shaft rotation. Active members are designa- ted with sections cross-hatched. For example, for engagement in the third gear, the main shaft third gear is clutched to the output shaft. This is schematically illustrated by means of the drive dog engaging the slot in the gear.

3.2 Four Speed Planetary Gear Transmission

Fig. 6 illustrates the four speed planetary gear transmission in gear with the torque path de-

noted 1)~ straight lmltl arrows. Curved arrows indicate direction of shaft rotation. Active memhcrs are designated with sections cross- hatched. For example, second gear is illustrated in Fig. 4. The pertinent brake hand is cross- hatched to denote brake application. Additional information added to this diagram is optional, ‘I’he speed of the sun gear, ring gear and carriers is designated for 100 rev/min input speed; clutch plate speed differential is designa- ted for 100 rev/min input speed; and torque of the sun gear, ring gear and carrier is designa- ted fur 1’00 ‘T’ input torque.

4 ONE-WAY CLUTCH DIAGRAMS

1;1%. 7 illustrates one way cllltch diagrams mm1perl to show the direction of relative rolntion l)c*twccri various elements.

r c CLUTCH /- ,

r 23~

LTH

\.-

3R@ 7NO WV --

\

1ST ,

L LO

I

-

X

37 -

\--

\

:

L

50

.-I-r. I -

- - x Tli X- 26

17 A -

IDLER7

x

.-_.I: 2’

. _ _.. _

50 . I \

-.t

I- 50

- - _ .

-

1 REVERSE SHAFT

GEAH ROTATABLE ON SHAFT IF NOT OTHERWISE INDlCATkD

GEAR FIXED TO SHAFT

GEAR SPI.INFD TO SHAFT ANll SLIDEABLF:

GEAR ENGAGEABLE BY JAW CLUTCH

GEAR ENGAGEABLE THRu SYNCHRONIZED CLUTCH

Y

z= r0R-r

7’ FIG. 1 FIVE Sre~r) TRANSMISSION DIAGIQ\M -- NIWI,K~\L

LTtl BANr

IS 12587 I 1989

2ND Cl

\-

.UTCH

REVERSE REAC _,--- ------

TION BR

IST, 2ND BAND _-_-

TORSIONAL DAMPER

TORQUE CONVERTER

INP~JT

FIG. 3 THREE SPEED TRANSMISSION WITH SPLI'I TORQUE PATH -NNEWRAL

LTH REACTION BRAKE ICLUTCti)

CLUTCH -..-.- _

TORQUE CONVERTER I -._._

TORSIONAL DAMPER

-.--.--_

INPUT

2NO @AND 3RD CLuTCti

RE VER,SE ANNI)

MANUAL 1ST CHAIN

REACTION BRAKE ,./-

(CLUTCH) -_ --. ..-._-.---.

OUTPIJT

3

IS 12587 : 1989

‘. _ CLUTCH _” _~

-

-

-

_)_-

-

30 7PM

-

FIG. 5 FIVE Smm TRANSMISSION DIAGRAM-THIRD SPEED

TORQUE k5XVtRTER

CLUTCH PLATF- DIFFERENTIAL : 1=,7 rprn

ONE WAY CLUTCH

(CONVFRTFR IN COlJPI INC, RANGI 1

4

IS 12587 : 1989

---1 OUTER ELEMENT ./-x-b - --

ROLLER OR SPRAG _-- ,_-.-- ~---- INNER ELEMENT _*-------

I. ~_ _..~~~. ._~_. - .__. ._.__ AXIS OF ROTATION

OUTER ELEMENT FREEWHEELING IN BACKWARD DIRECTION RELATIVE 10 INNER ELEMENT

OUTER ELEMENT _7-- ._

ROLLER 0R SPRAG . _.w-- xx _

INNER ELEMENT . ..-- .--- -’

___ . __.. - - -. -..-- _ _I_ _.._.__ _..._ .- -_ AXIS 0~ ROTATION

OUTER ELEMENT FREEWHEELING IN FORWARD IX’ECTION RELATIVE TO INNER ELEMENT

FIG. 7 ONE-WAY CLUTCH DIAORAM

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1 I .-..- .._ ____

.

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Dot : No. EDC 103 ( 5024 )

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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