Quality Transmission is the largest North American supplier of off-the-shelf metric gearing. KHK Stock Gears are proudly produced by Kohara Gear Industry of Saitama Japan and stocked in North America by Quality Transmission Components



Specifications
Precision grade JIS B 1704 grade 2 Core hardness HB250300
Gear teeth Gleason Surface hardness HRC5560
Pressure angle 20 Surface treatment Black oxide except
ground surfaces
Helix angle 35 Surface finish Ground
Material SCM415 (Alloy steel) Datum reference surface
for gear grinding		 Bore
Heat treatment Teeth induction hardened
after carburizing


B3
B4

Gear Ratio 2
 Module 24

Catalog No. Hand of
thread		 Module No. of
teeth		 Bore Hub dia. Pitch dia. Outside dia. Mounting
distance		 Total length Crown to
back length		 Hub width Length
of bore		 Face width Holding
surface dia.		 Face angle Shape Allowable
torque (kgfm)		 Allowable
torque (Nm)		 Backlash
(mm)		 Weight
(kgf)		 Catalog No.
m z AH7 B C D E F G H I J K L Bending
strength		 Surface
durability		 Bending
strength		 Surface
durability
MBSG2-4020R
[ DXF| DWG | 3D CAD]
MBSG2-2040L
[ DXF| DWG | 3D CAD]		 R

L

 2 40

20

 15

12

 45

35

 80

40

 81.1

44.1

 45

55

 31.78

28.16

 26.1

16.02

 18

13.75

 29

27

 14

14

 52.7

25.39

 6606'

3004'

 B4

B3

 4.862

2.436

 8.891

4.445

 47.68

23.89

 87.19

43.59

 0.050.11 0.55

0.17

 MBSG2-4020R

MBSG2-2040L

MBSG2.5-4020R
[ DXF| DWG | 3D CAD]
MBSG2.5-2040L
[ DXF| DWG | 3D CAD]		 R

L

 2.5 40

20

 16

12

 55

43

 100

50

 101.29

55.12

 50

65

 33.35

31.01

 26.29

16.28

 16

13.25

 30

29

 17

17

 66.99

29.97

 6528'

3007'

 B4

B3

 9.324

4.671

 17.36

8.678

 91.44

45.81

 170.2

85.1

 0.060.12 0.96

0.27

 MBSG2.5-4020R

MBSG2.5-2040L

MBSG3-4020R
[ DXF| DWG | 3D CAD]
MBSG3-2040L
[ DXF| DWG | 3D CAD]		 R

L

 3 40

20

 20

16

 65

52

 120

60

 121.57

66.03

 60

80

 39.81

38.9

 31.57

21.51

 20

18

 35

36.5

 20

20

 80.28

36.56

 6542'

2944'

 B4

B3

 15.91

7.969

 30.06

15.03

 156

78.15

 294.8

147.4

 0.070.13 1.52

0.55

 MBSG3-4020R

MBSG3-2040L

MBSG4-4020R
[ DXF| DWG | 3D CAD]
MBSG4-2040L
[ DXF| DWG | 3D CAD]		 R

L

 4 40

20

 25

20

 80

70

 160

80

 162.06

88.46

 75

100

 48.27

45.38

 37.06

22.12

 22

17.5

 42

43

 27

27

 106.63

51.25

 6529'

3045'

 B4

B3

 38.01

19.04

 73.66

36.83

 372.7

186.7

 722.4

361.2

 0.10.16 3.3

1.1

 MBSG4-4020R

MBSG4-2040L

Pitch Angle Gear 6326' Pinion 2634'
CAUTION: Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some differences will occur due to the corner chamfering of the gear tips.
NOTE: The allowable torques shown in the table are calculated according to JGMA Standards 403-01 and 404-01.
Reference: Tooth surfaces of spiral gears have concave and convex sides. Change in the rotational direction of the driving gear alters the contact surface accordingly. The illustrations show top views of RH and LH spiral gears, and the tables on the right explain the different contact surface depending on the situation.

RH spiral as a driving gear
Rotating direction of
driving gear		 Contact surface
Driving gear(RH spiral) Driven gear(LH spiral)
RH rotation
(clockwise)		 Convex surface Concave surface
LH rotation
(counterclockwise)		 Concave surface Convex surface

LH spiral as a driving gear
Rotating direction of
driving gear		 Contact surface
Driving gear(LH spiral) Driven gear(RH spiral)
RH rotation
(clockwise)		 Concave surface Convex surface
LH rotation
(counterclockwise)		 Convex surface Concave surface

 

Reference: or a spiral bevel gear with shaft angle = 90, pressure angl n=20and spiral angle m = 35, the tables below show the axial thrust force Fa and the radial force Fr when a tangential force Fu of 100 units is applied at the center of face width.

The tables show the values of

(1) Force acting upon pinion
Contact
surface		 Gear ratio z2/z1
1.0 1.5 2.0 2.5 3.0 4.0 5.0
Concave
surface
Convex
surface

(2) Force acting upon gear
Contact
surface		 Gear ratio z2/z1
1.0 1.5 2.0 2.5 3.0 4.0 5.0
Concave
surface
Convex
surface

 

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