| 摘要 |
<p>WINCH CONSTRUCTION A winch construction including a frame having a winch drum journalled for rotation thereon, the winch drum having a hollow hub. A bidirectional, rotary output,hydraulic motor is mounted on the frame and has an output shaft extending into the hub. A first set of planetary gears is contained within the hub and includes a sun gear driven by the shaft, a planet gear engaging the sun gear and journalled on a rotatable carrier, and a ring gear engaging the planet gear. A second planetary gear set is disposed within the hub and includes a sun gear, at least one planet gear engaging the sun gear and journalled on the drum within the hub and a ring gear engaging the planet gear. An axially shiftable face gear is coupled to the carrier of the first set for rotation therewith and a motor is provided for selectively axially shifting the face gear between positions engaging the sun gear of the second set and the drum within the hub. A hollow shaft is concentric about the motor shaft and extends within the hub. A third planetary gear set is within the hub and includes a sun gear affixed to the hollow shaft, a planet gear engaging the sun gear and journalled on the frame, and a ring gear engaging the planet gear and carried by the drum within the hub. The ring gears of the first and second sets are coupled to the hollow shaft and the winch includes a normally engaged brake and a coupling between the hollow shaft and the brake including a one-way clutch.</p> |
