GEAR APPARATUS.

摘要

PCT No. PCT/JP84/00447 Sec. 371 Date May 3, 1985 Sec. 102(e) Date May 3, 1985 PCT Filed Sep. 17, 1984 PCT Pub. No. WO85/01334 PCT Pub. Date Mar. 28, 1985.A gear system has a planetary gear (5) mounted on a conical main shaft (8) in such a manner to move axially thereon, the planetary gear being in meshing engagement with a central gear (3). A receiving device is provided to receive thrust generated at the planetary gear (5). When a plurality of planetary gears (5) are employed, a clearance (S) formed between the surface of the conical main shaft (8) and an inner peripheral surface of a bearing (17) of each planetary gear (5) is changed according to the axial position of each gear (5) on the conical shaft (8) under the influence of a thrust counterbalancing device. Thus, a distance between the center axis of the conical shaft (8) and that of the planetary gear (5) is thereby increased or decreased to effect even application of load to each planetary gear (5).