| 摘要 |
A transmission compounder assembly comprising an input shaft, an output shaft and a one-way clutch operable to establish a direct-ratio drive path between the shafts. A planetary gearset can be selectively engaged to establish a compound-ratio drive path between the shafts. The planetary gearset includes a sun gear, a ring gear fixed to the output shaft, a carrier fixed to the input shaft, and a plurality of planet gears rotatably supported from the carrier and meshed with both the ring gear and the sun gear. A band brake is provided for selectively braking the sun gear. A clutch pack is mounted between the carrier and the sun gear and can be selectively actuated to prevent relative rotation therebetween. The compounder assembly further includes a brake actuator for controlling actuation of the band brake and a clutch actuator for controlling actuation of the clutch pack. The compounder assembly is operable in a direct drive mode wherein the band brake is released and the clutch pack is engaged to couple the sun gear for common rotation with the carrier. As such, the one-way clutch functions to transfer rotary power from the input shaft to the output shaft while the clutch pack absorbs any reverse relative rotation. In addition, an overdrive mode is established by releasing the clutch pack and engaging the band brake such that the sun gear is braked and the ring gear drives the output shaft at a non-direct speed relative to the input shaft.
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