| 摘要 |
<p>A manual transmission (10) capable of producing six forward speed drive ratios including at least two different overdrive speed ratios. The transmission includes an input shaft (14) adapted to continuously drive a cluster gear assembly (26). Moreover, the input gear (22) may be selectively coupled directly to an output shaft (16) to provide for direct drive. The continuously driven cluster gear (26) may be selectively coupled to the output shaft (16) through any one of five other gear meshes (36,42,48,54,60). Two of those five other gear meshs include a pair of relatively large speed gears (58,64) arranged to freely rotate on the countershaft (28) of the cluster gear assembly (26) when the transmission is not engaged in either overspeed drive ratio. As such, these gears do not affect the rotational inertia of the cluster gear assembly (26) and reduces the rotational inertia of the input shaft (14). A reverse drive can be effected by coupling a gear (68) on the cluster gear assembly (26) through a reverse idler gear (72) to the output shaft (16).</p> |
