| 摘要 |
PURPOSE:To prevent an inner gear ring from being positionally shifted due to the shearing failure of knock pins, by providing such an arrangement that a resilient member is fitted over the outer periphery of each knock pin so that counter-drive force exerted to the inner ring gear is absorbed by the deformation of the resilient members fitted over the knock pins. CONSTITUTION:An inner ring gear 3 tends to be positionally shifted with respect to a casing 6 by counter-drive force when a planetary gear is driven to rotate, and therefore, knock pins 10 are subjected to shearing load. However, this shearing load is absorbed by the deformation of a resilient member 12 fitted over the periphery of each knock pin 10. By setting the wall thickness of the resilient member 12 larger than the clearance between each bolt and each bolt hole, the inner ring gear 3 is positionally shifted to the position where the shearing load is exerted to a plurality of bolts wich secures the inner gear ring 3 to the gear case 6, when the deforming force of the resilient members 12 becomes large, and the shearing force applied by the counter-drive force which is exerted to the inner ring gear 3 is distributed to the fastening bolts. Thereby, the concentration of the searing load with respect to the knock pins 10 due to the counterdrive force exerted to the inner ring gear 3 does not occurs so that the shearing failure of the knock pins 10 in use may be surely prevented. |
