| 摘要 |
<p>A utility vehicle, such as an agricultural harvesting machine (10) is provided with a variable belt transmission of the positorque type. The transmission comprises a transmission device (200) including a hub (204) supporting a first sheave member (202) and a sleeve (210) received on said hub (204) and moveable axially and rotationally in relation thereto, said sleeve supporting a second sheave member (214), defining together with the first sheave member (202) a variable groove (216) adapted to receive a belt (32). The device (200) further comprises wedge members (250) disposed on said hub (204) and an associated wedge track (252) disposed on said sleeve (210), said wedge member (250). In the event of belt slippage the wedge member (250) moves along the wedge track (252) in such a manner as to rotate said sheave members (202, 214) relative to each other and to simultaneously force said sheave members axially towards each other and thereby to increase grip on said belt. The wedge member (250) and said wedge track (252) are enclosed in a casing (270) defined within said power transmission device (200, 400) by one or more of said sheave members (202, 214/410, 412), hub (204) and sleeve (210). <IMAGE></p> |
