Gearbox for use in power unit of car, has countershaft provided with two reverse pinions that mesh with pinions of secondary shaft and primary shaft, respectively, where reverse pinions are selectively rotated relative to each other

摘要

The gearbox (2) has a transmission gear (I) provided with a pinion (10) of a primary shaft (6), where the pinion meshes with a pinion (26) of a secondary shaft (8). Another transmission gear (V, VI) is provided with another pinion (14) of the primary shaft. A countershaft (48) is provided with a reverse pinion (42) that meshes with the pinion of the secondary shaft. The countershaft is provided with another reverse pinion (46) that meshes with the latter pinion of the primary shaft. The reverse pinions are selectively rotated relative to each other.