Abstract: There is disclosed a gear system wherein a gear (5) is mounted on a conical main shaft (8) in such a manner to move axially thereon, the gear being in meshing engagement with a gear (3) and a receiving device is provided to receive thrust generated at the gear (5). When a plurality of gears (5) are employed, a clearance (S) formed between the surface of the conical shaft (8) and the inner peripheral surface of a bearing (17) of each gear (5) is changed according to axial position of the gear (5) on the conical shaft (8) under the influence of thrust counterbalance device. Thus, a distance between the center axis of the conical shaft (8) and that of the ger (5) is thereby increased or decreased so as to effect even application of load to each gear (5).

Abstract: 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).