KHK Stock Gears 3013
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290SpurGearsHelicalGearsInternalGearsRacksCP Racks& PinionsMiterGearsBevelGearsScrewGearsWormGear PairBevelGearboxesOtherProductsGround Spiral Bevel GearsModule 2、2.5、3、4MBSGABCDKEFGHIJGGB3SpecificationsPrecision gradeJIS B 1704 : 1978 grade 1Gear teethGleasonPressure angle20°Helix angle35°MaterialSCM415Heat treatment CarburizingTooth hardness55~60HRC■ Contact Surface of Spiral Bevel GearsTooth surfaces of spiral gears have concave and convex sides. Changes in the rotational direction of the driving gear alter the contact surface accordingly. The illustrations show the top view of RH and LH Spiral Gears, and the tables on the right explain the dierent contact surface depending on the situation.Rotating Direction of Driving Gear Note 1Contact SurfaceDriving Gear (RH Spiral)Driving Gear (LH Spiral)RH Rotation (Clockwise)Convex SurfaceConcave SurfaceLH rotation (counterclockwise)Concave SurfaceConvex SurfaceRH Spiral as a driving gearRotating Direction of Driving Gear Note 1Contact SurfaceDriving Gear (LH Spiral)Driving Gear (RH Spiral)RH Rotation (Clockwise)Concave SurfaceConvex SurfaceLH Rotation (Counterclockwise)Convex SurfaceConcave SurfaceLH Spiral as a driving gear[Caution on Product Characteristics]① Allowable torques shown in the table are the calculated values according to the assumed usage conditions. Please see page 283 for more details.② Dimensions of the outside diameter, the overall length and crown to back length are all theoretical values, and some dif-ferences will occur due to the corner chamfering of the gear tips.③ These gears produce axial thrust forces. Please see Page 284 for more details.〔Note 1〕Rotation directions given in the tables are for viewing the gears from the hub side.Concave surfaceConvex surfaceRH spiralLH spiralToothTooth*For products not categorized in our KHK Stock Gear series, custom gear production services with short lead times is available. For details see Page 8.Catalog No.Gear ratioModuleNo. of teethDirectionof spiralShapeBoreHub dia.Pitch dia.Outside dia.Mounting distanceTotal lengthCrown to back lengthAH7BCDEFGMBSG2-4020RMBSG2-2040L2m24020RLB4B315124535804081.144.1455531.7828.1626.116.02MBSG2.5-4020RMBSG2.5-2040Lm2.54020RLB4B31612554310050101.2955.12506533.3531.0126.2916.28MBSG3-4020RMBSG3-2040Lm34020RLB4B32016655212060121.5766.03608039.8138.931.5721.51MBSG4-4020RMBSG4-2040Lm44020RLB4B32520807016080162.0688.467510048.2745.3837.0622.12

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