KWGDL KWGDLS & AGDL Duplex Worm Gears - GIDEN Russia/KWGDL KWGDLS AGDL.pdf · tooth surface and, therefore, you must orient the worm and worm wheel properly. Please carefully verify

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Duplex Worm GearsKWGDL・KWGDLS & AGDL

■ Description of duplex worm gearsThe usual method of adjusting the backlash of a worm gear as-sembly is to modify the center distance. Once assembled, such adjustment requires a major rework of the gearbox housing. The use of duplex worm gears allows the backlash adjustment to be made by axially shifting the worm. This simplifies greatly the as-sembly and maintenance operations. Because of the unique char-acteristics of the product, please take time to study its construc-tion and proper use.

■ Backlash adjustment mechanism and method of adjustment

〔CAUTION〕The amount of change in backlash ( △ j mm) in relation to the axial movement of the duplex worm shaft (V mm) can be calculated from the formula below.

Wherema ＝ Nominal Axial Module －（0.01 × Nominal Axial Module）

mb ＝ Nominal Axial Module ＋（0.01 × Nominal Axial Module）

Δ j ＝ 2Vmb －ma

ma ＋mb

〔CAUTION〕 The KHK duplex worm is designed so that, for all modules, the backlash reduces by 0.02 mm when the worm is shifted 1 mm.

Fig.1

■ Application Examples

Adjustment by using Screws * Adjustment by using Shims *

Fig. 2

Adjusting Screw Adjusting Shim

The dual-lead worm is formed to give a difference between the right tooth surface and left tooth surface so that it provides a unique tooth profile in which the tooth thick-ness varies continuously, corresponding with the lead difference. (Fig.1)The worm gear is also formed in its right and left tooth surface.When such a worm and worm gear are set up at a constant assembly distance and the worm is moved in the axial direction, the tooth thickness of the worm in mesh with the worm gear changes making backlash adjustment possible.

An arrow marking on the outer circumference of the hub of the KHK duplex worm indicates the direction of assembly as well as acts as a guide for the backlash adjustment.When the worm is held with arrow mark pointing right, the tooth thickness is thinner on the right and thicker on the left. Therefore, moving the worm to the right causes the thicker teeth to come into actual engagement with the worm gear, thereby reducing the backlash. (Fig.2)

(a tooth surface pitch) (b tooth surface pitch)

b tooth surface a tooth surface

(Nom

inal s

urfa

ce)

Reference tooth

Moving the worm in the direction of the arrow causes the backlash to decrease.

* The illustration above is a design example, not a design for machinery or a device in actual use.

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To find information on new products, see Page 6 and 7.

Arrow mark indicates the correct orientation of two gears when assembled. As shown, the two arrows must point in the same direction.

■ Point of caution during assemblyKHK duplex worm gears differs in module between the right and left tooth surface and, therefore, you must orient the worm and worm wheel properly. Please carefully verify the following two aspects be-fore proceeding with assembly.

1. Verifying the orientation of assembly An arrow indicating the orientation of assembly is stamped on both the duplex worm and worm wheel. When assembling

the worm and worm wheel, check the worm wheel of the arrow mark on the front such that the direction of arrow mark on the worm coincides with that on the worm wheel. Should the assembly be incorrect, the center distance “a” will become larger than the normal distance, resulting in difficulty of assembly and improper gear engagement. (Fig.3)

2. Verifying the reference positionA V-groove (60 ,゚ 0.3 mm deep line) on tip peripheral of the duplex worm tooth marks the reference tooth. The gear set is des-ignated to have a backlash of nearly zero ( ± 0.045) when the reference tooth is positioned in alignment with the center of rota-tion of the worm wheel with the center distance set at the value "a". (Fig.4)

Fig. 3

Fig. 4

Reference toothReference tooth

Cen

ter d

ista

nce

Duplex Worm Gears

KWGDL・KWGDLS & AGDL

Cen

ter d

ista

nce

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Duplex WormsModule 1.5、2KWGDL・KWGDLS

Duplex Worms WheelsModule 1.5、2AGDL

R

M

P Q

L N O

S

Vmax

G GG

G

G

G

W4

Catalog No.Nominal axial

moduleNumber of

startNominal

lead angleHand of tread Shape

Bore Hub dia. Pitch dia. Outside dia. Face width Hub width Total length

LH7 M N O P Q RKWGDL2-R1 m2 1 3°41' R W4 14 25 31 35 36 14 50


moduleNumber of

startNominal


Total length Shaft length (L) Neck length (L) Face width Neck length (R) Shaft length (R) Pitch dia.

J K L M N O PKWGDLS1.5-R1 m1.5 1 3°26' R W6 190 66 12 28 18 66 25KWGDLS2-R1 m2 1 3°41' R W6 220 75 13 36 21 75 31

Catalog No.Reduction

ratioNominal axial

moduleNo. of teeth

Helix angle Hand of tread ShapeBore Hub dia. Pitch dia. Throat dia. Outside dia. Face width Hub width

AH7 B C D D' E F

AGDL1.5-20R1AGDL1.5-30R1AGDL1.5-36R1AGDL1.5-40R1AGDL1.5-50R1AGDL1.5-60R1

203036405060

m1.5

203036405060

3°26'3°26'3°26'3°26'3°26'3°26'

RRRRRR

H1H1H1H1H1H1

81010121212

223035354550

304554607590

334857637893

34.549.558.564.579.594.5

141414141414

101010101010

AGDL2-20R1AGDL2-30R1AGDL2-36R1AGDL2-40R1AGDL2-50R1AGDL2-60R1

203036405060

m2

203036405060

3°41'3°41'3°41'3°41'3°41'3°41'

RRRRRR

H1H1H1H1H1H1

121515151515

334045455060

40607280

100120

44647684

104124

46667886

106126

181818181818

151515151515

GE F

J

A B DC D’

H1

[Caution on Product Characteristics] ① When the center distance is moved to reduce the backlash, the V max is the maximum amount of distance that you may shift without causing problems with the gear mesh. The V max is not a recommended value to use for adjustment when assembling.

② For W6 Shaped Gears, the tolerances of the shaft diameter are set to S +0.2 and +0.1 (+0.40 and +0.35 for the ground area).③ These worms produce axial thrust forces. See page 512 for more details.

[Caution on Product Characteristics] ① The allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 510 for more details.

② Duplex worms and worm wheels must be mated in a predetermined orientation, which is indicated by the arrows. Therefore, the arrow on the wheel does not indicate the mounting direction, but the rotating direction. Please refer to the Application Hints on page 515.

Specifications

Precision grade KHK W 002 grade 1Referencesection of gear Rotating plane

Gear teeth Standard full depth

Normalpressure angle 17° 30'

Material CAC702 （formerly JIS AℓBC2)

Heat treatment ―

Tooth hardness ―

Specifications

Precision grade KHK W 001 grade 1Referencesection of gear Axial



Material SCM440

Heat treatment Thermal refined, tooth surfaceinduction hardened

Tooth hardness 45～ 55HRC

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JML N OK

T

S R P Q S

Vmax

G G G G

W6

Position ofreference tooth Max. allowable shift Weight

(kg)Catalog No.

S Vmax22 8 0.21 KWGDL2-R1

Outside dia. Neck dia. Shaft dia. Position ofreference tooth Max. allowable shift Weight

(kg)Catalog No.

Q R S T Vmax28 21 26 17 6 0.74 KWGDLS1.5-R135 24 30 22 8 1.17 KWGDLS2-R1

Total length Web thickness Web O.D. Mounting distance Allowable torque (N·m) NOTE 1 Backlash

(mm)

Weight

(kg)Catalog No.

G （H）（ I ） J 30 rpm 100 rpm 300 rpm 600 rpm 900 rpm 1200 rpm 1800 rpm

242424242424

――――――

――――――

27.53539.542.55057.5

9.8420.829.335.653.875.3

8.1817.524.630.045.463.8

6.4013.919.824.236.951.9

5.3011.716.820.631.644.7

4.6810.414.918.328.340.4

4.259.40

13.516.625.836.7

3.688.28

11.914.622.632.4

0±0.0450±0.0450±0.0450±0.0450±0.0450±0.045

0.10 0.22 0.320.37 0.59 0.83


333333333333

――――――

――――――

35.545.551.555.565.575.5

21.044.362.375.8

115160

17.537.352.664.096.8

136

13.629.642.051.478.4

110

11.224.835.543.666.994.6

9.8421.931.338.559.584.9

8.9419.828.434.954.277.2

7.7517.425.030.747.668.1

0±0.0450±0.0450±0.0450±0.0450±0.0450±0.045

0.260.510.730.861.301.88


[Caution on Secondary Operations] ① Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available.

② Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. 1 to 2 mm).


Duplex Worms

KWGDL・KWGDLS

Duplex Worm Wheels

AGDL

NOTE 1. Allowable torques for worm rotation (rpm)

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GE F

J

A B DC D’

H1

R

M

P Q

L N O

S

Vmax

G GG

G

G

G

W4


moduleNumber of

startNominal



LH7 M N O P Q RKWGDL2.5-R1 m2.5 1 3°52' R W4 18 30 37 42 48 17 65KWGDL3-R1 m3 1 3°54' R W4 20 35 44 50 54 20 74


moduleNumber of

startNominal





ratioNominal axial

moduleNo. of teeth


AH7 B C D D' E F


203036405060

m2.5

203036405060

3°52'3°52'3°52'3°52'3°52'3°52'

RRRRRR

H1H1H1HBHBHB

151515151515

404045456080

507590

100125150

558095

105130155

57.582.597.5

107.5132.5157.5

222222222222

151515151515


203036405060

m3

203036405060

3°54'3°54'3°54'3°54'3°54'3°54'

RRRRRR

H1H1H1HBHBHB

202020202020

505560607080

6090

108120150180

6696

114126156186

6999

117129159189

282828282828

171717171717





Specifications




Material CAC702 （formerly JIS AℓBC2)

Heat treatment ―

Tooth hardness ―

Specifications




Material SCM440



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JML N OK

T

S R P Q S

Vmax

G G G G

W6


(kg)Catalog No.

S Vmax29 10 0.37 KWGDL2.5-R132 10 0.61 KWGDL3-R1


(kg)Catalog No.


A B C D D’

( I )

J

GE F

(H)

CS

CS

HB＊ CS has a sand mold casting finish.

[Caution on Secondary Operations]


Duplex Worms

KWGDL・KWGDLS

Duplex Worm Wheels

AGDL


(mm)

Weight

(kg)Catalog No.


373737373737

―――

(10)(12)(12)

―――(86)

(108)(133)

43.55663.568.58193.5

38.180.5

113138208291

31.467.194.5

115174245

24.553.175.592.4

141198

20.144.563.878.3

120170

17.639.156.068.8

106152

16.035.551.062.797.3

139

13.830.944.354.484.3

121

0±0.0450±0.0450±0.0450±0.0450±0.0450±0.045

0.450.881.251.141.932.90


454545454545

―――

(14)(14)(14)

―――

(106)(134)(164)

5267768297

112

65.0137193235355497

53.3114160195295415

41.590.0

128157239336

33.874.7

107131202285

29.565.593.8

115178254

26.959.585.6

105163233

22.851.273.490.1

140200

0±0.0450±0.0450±0.0450±0.0450±0.0450±0.045

0.811.652.322.193.264.48



① Please read “Caution on Performing Secondary Operations” (Page 512) when performing modifications and/or secondary operations for safety concerns. Haguruma Kobo, the KHK's system for quick modification of KHK stock gears is also available.

② Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bottom land (approx. 1 to 2 mm).

520

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R

M

P Q

L N O

S

Vmax

G GG

G

G

G

W4


moduleNumber of

startNominal



LH7 M N O P Q RKWGDL3.5-R1 m3.5 1 3°47' R W4 24 44 53 60 62 23 85KWGDL4-R1 m4 1 3°41' R W4 28 50 62 70 74 26 100


moduleNumber of

startNominal





ratioNominal axial

moduleNo. of teeth


AH7 B C D D' E F


203036405060

m3.5

203036405060

3°47'3°47'3°47'3°47'3°47'3°47'

RRRRRR

H1H1H1HBHBHB

202020202020

556070708090

70105126140175210

77112133147182217

80.5115.5136.5150.5185.5220.5

323232323232

181818181818


203036405060

m4

203036405060

3°41'3°41'3°41'3°41'3°41'3°41'

RRRRRR

H1HBHBHBHBH5

202020202030

6065757590

120

80120144160200240

88128152168208248

92132156172212252

353535353535

202020202020

GE F

J

A B DC D’

H1





＊ H5 shape have a hub made from S45C cast iron.

Specifications




Material CAC702 （formerly JIS AℓBC2)＊

Heat treatment ―Tooth hardness ―

Specifications




Material SCM440



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JML N OK

T

S R P Q S

Vmax

G G G G

W6


(kg)Catalog No.

S Vmax

37 12 1.05 KWGDL3.5-R144 14 1.67 KWGDL4-R1


(kg)Catalog No.



② Due to the gear teeth being induction hardened, no secondary operations can be performed on tooth areas including the bot-tom land (approx. 1 to 2 mm).

＊ CS has a sand mold casting finish.

Duplex Worms

KWGDL・KWGDLS

Duplex Worm Wheels

A B C D D’

( I )

J

GE F

(H)

CS

CS

HB

( I )

J

A B C D D’

GE F

(H)

H5

AGDL



(mm)

Weight

(kg)Catalog No.


505050505050

―――

(15)(16)(16)

―――

(124)(155)(189)

61.57989.596.5

114131.5

98.5208293356538753

80.4172242295446627

62.5136193236360506

50.4111160196301425

44.298.1

141173267381

40.088.3

127156243345

33.775.7

109133207296

0±0.0450±0.0450±0.0450±0.0450±0.0450±0.045

1.242.513.613.345.026.87


555555555555

―(17)(17)(17)(17)(17)

―(99)

(121)(137)(177)(200)

7191

103111131151

134284400486735

1030

109234329400605851

84.8184262320488687

67.9150215264405572

59.7132190233361515

53.4118170208324461

44.8101144177275393

0±0.0450±0.0450±0.0450±0.0450±0.0450±0.045

1.763.014.184.787.07

11.5



Documents

KWGDL KWGDLS & AGDL Duplex Worm Gears - GIDEN Russia/KWGDL KWGDLS AGDL.pdf · tooth surface and, therefore, you must orient the worm and worm wheel properly. Please carefully verify