| 摘要 |
A power transmission mechanism (1) for use in a toy vehicle with an engine that realizes a smooth shift between a forward operation and a reverse operation with a relatively simple structure is provided. The power transmission mechanism has a first gear(8) secured to an input shaft (3). A second gear (13) connectable to the input shaft through a clutch mechanism (11,17,19,21,39) is provided around the input shaft to rotate freely in the direction of rotation of the driving force from the engine when the clutch mechanism is in a disengaged state but does not permit rotation of the second gear(13) relative to the input shaft in a direction opposite to the rotation direction of the driving force. A brake mechanism (25,27,29) is provided to restrain the rotation of the second gear. A third gear (51) is in mesh with the first gear (8). A fourth gear (53) is in mesh with the second gear(13). The power transmission mechanism further has first to third bevel gears (55.57,61). The gear ratio between the first and third gears (8,51) is equal to that between the second and fourth gears (13,53). <IMAGE> |
