| 摘要 |
A planetary gear reduction assembly is provided with a ring gear (16) and a sun gear (12) which are each adapted to be directly driven in opposite directions by a rotary input to slowly drive pinions (14). An initial split or sharing of torque, i.e. load sharing, is provided with a rotary input consisting of an input shaft (22) and bevel gear (26) which simultaneously drives gears (28) and (30) in opposite directions. Gears (28) and (30) are supplemental driving surfaces of the sun gear (12) and the ring gear (16) respectively, and are operatively engaged by driving surfaces of bevel gear (26). Gears (28) and (30) are integral to sun gear (12) and ring gear (16) respectively. Gears (28) and (30) can also be driven by a second input shaft (36) and bevel gear (34). Gear (28) is a flanged extension of sun gear (12) which drives pinions (14). Gear (30) is a flanged extension of ring gear (16) which also drives pinions (14). The sun gear (12) and ring gear (16) are caused to rotate in opposite directions about a concentric axis (38). This configuration provides high gear reduction. It also provides a high Ds/Dr (diameter of sun gear to diameter of ring gear) ratio for accommodating a large number of planetary pinions to share in load transfer. A further embodiment of the invention replaces ring gear (16), sun gear (12), and pinion gears (14) with friction roller gears. |
