Vehicle transmission and method for its operation

摘要

A transmission having a plurality of shifting elements which are selectively engaged and disengaged when a gearshift is carried out, and a plurality of gearsets which, depending on the shifting position of the shifting elements produce a defined transmission ratio, and a shifting oil system which supplies the shifting elements with oil in order to operate them and a cooling and lubricating oil system which supplies assemblies of the transmission with oil for cooling and/or lubricating. From the shifting oil provided by the shifting oil system, a partial stream of oil can be tapped off for cooling and/or lubricating the shifting elements, such that a quantity of cooling and lubricating oil that is or can be supplied by the cooling and lubricating oil system can be reduced to the quantity required for cooling and/or lubricating those assemblies of the transmission which do not contain the shifting elements.

主权项

1. A transmission of a motor vehicle comprising:
a plurality of shifting elements (A, B, C, D, E) which are selectively engaged and disengaged when a gearshift is carried out, a plurality of gearsets (11, 12, 13, 14) for producing, depending on a shifting position of the shifting elements and hence depending on a gear engaged, a defined transmission ratio, a shifting oil system (15) for supplying the shifting elements with shifting oil in order to operate the shifting elements, the shifting oil system having a central shifting oil line and a plurality of shifting oil supply lines, and each of the shifting oil supply lines communicates with the central shifting oil line and a respective one of the plurality of shifting elements such that a flow of shifting oil is deliverable to each of the shifting elements via a respective one of the plurality of shifting oil supply lines, and a cooling and lubricating oil system for supplying assemblies of the transmission with cooling and lubricating oil for at least one of cooling and lubricating the assemblies of the transmission, a tap is arranged in each of the shifting oil supply lines such that a partial stream of shifting oil is divertable, via the tap, from the flow of shifting oil to the respective shifting element for at least one of cooling and lubricating the shifting elements (A, B, C, D, E) such that a quantity of the cooling and lubricating oil, that is supplied by the cooling and lubricating oil system is reducible to a quantity required for the at least one of cooling and lubricating the assemblies of the transmission which do not contain the shifting elements (A, B, C, D, E).