| 摘要 |
A constant mesh gearbox 10 providing a plurality of forward speed ratios. The gearbox 10 comprising a casing 14 defining a plurality of parallel shaft axes 11, 12, 13 having shafts 21, 22, 23, 31, 35 rotatable thereon and between which gear wheel pairs associated with each speed ratio are arranged to transmit torque. The casing 14 further defining a support plane 40 orthogonal to the axes 11, 12, 13 and containing a support bearing 45, 33, 37 for a shaft on each of the axes 11, 12, 13. The gearbox 10 providing four or more forward speed ratios, the gear wheel pairs associated with the odd forward speed ratios being provided on one side of the support plane 40, and the gear pairs associated the even forward speed ratios being provided on the other the of said support plane 40. Preferably there are two input shafts 21, 21 arranged one within the other and an output shaft 23 coaxial with the input shafts 21, 22. |
