| 摘要 |
An apparatus (30) for controlling the rotational speed of an input shaft (72) of a motor vehicle transmission (14) such as a compound heavy duty transmission to achieve synchronous during a ratio change includes a variable speed motor (150) having a motor shaft (152) operably engaged with an input shaft (72) of the transmission (14), preferably through an intermediate gear (156) and a countershaft gear (104). The motor (150) may be an electric, hydraulic or pneumatic motor, having a speed variable between zero and a maximum value so that the speed of the input shaft (72) can be decreased during upshifts, or increased during downshifts. In an alternative embodiment, the motor (150) is operably engaged with the input shaft (72) and with the output shaft (22). <IMAGE> |
