Transmission shaft i.e. hollow countershaft, for dual-clutch transmission of motor vehicle, has oil supplying holes formed with increasing diameters such that oil volumetric flow supplied to bearing surfaces is controllable

摘要

The shaft i.e. hollow countershaft (1), has bearing surfaces (3-6) designed for loose gears and/or fixed wheels of to-be-switched gear stages, of a transmission i.e. dual-clutch transmission (2). Radial oil supplying holes (8-10, 10a, 11, 11a) are arranged in an area of the surfaces, where the oil supplying holes are led out from an axial hole (7) and are formed with increasing diameters (D, D1, D2), such that volumetric flow of oil i.e. lubricating oil, supplied to the surfaces is controllable. The shaft is connected to an oil supplying device or an oil injecting nozzle (14) at an end.