procedure for reducing rotationsmotstu00e5ndet of gears in a gearbox for motor vehicles, together with the gearbox for the implementation of the procedure

摘要

A gearbox (10) in which the normal oil level (Nj) for operating with gear combinations of the gearbox is temporarily lowered during direct-drive operation to a level (NSUB2/SUB) at which lower gearwheels (20) of the gear combinations rotate with substantially no contact with the oil in the oil sump (22). The oil level is raised back to the normal level (NSUB1/SUB) upon engagement of gear combinations. To this end, an oil gathering tank (24) is connected to the gearbox housing (12) and has not only an upper oil inlet (26) in the region (28) of the housing (12) which during operation of gear combinations of the gearbox is exposed to oil splash from the lower gearwheels (20) immersed in the oil in the oil sump (22), but also a lower outlet (32) for leading oil accumulated in the tank (24) back to the oil sump (22). The outlet (32) is closable during direct-drive operation in order to lower the oil level in the oil sump (22).