Dual clutch transmission of a motor vehicle

Abstract

The invention relates to a sealing device for a dual clutch transmission (1) of a motor vehicle, comprising a transmission case (13) in which a clutch compartment (2), filled with a clutch oil, for receiving a dual clutch (4), and a transmission compartment (3), filled with a transmission oil, for receiving a dual clutch transmission gear train (5), and two drive shafts (7, 8), one coaxially received in the other, are arranged. One drive shaft (8) is configured as an internal central shaft that extends inside the transmission compartment (3) through the end of the second drive shaft (7) that is configured as an external hollow shaft. The two drive shafts (7, 8) are sealed by means of at least one seal for sealing the clutch compartment (2) from the transmission compartment (3). The aim of the invention is to provide a sealing device which is more reliable and which at the same time allows simple breathing and leakage detection. For this purpose, a receiving component (12) is arranged inside the transmission case (13) and is fixed thereto, two adjoining seals being received thereby. One seal (20) seals radially on the hollow drive shaft (7) and the other seal (19) seals radially on the central drive shaft (8).

Description

technical field [0001] The invention relates to a sealing device for a dual clutch transmission of a motor vehicle according to the preamble of claim 1 . Background technique [0002] Multiple clutch transmissions for motor vehicles have long been known. Its main advantage over conventional stepped transmissions is that the shifting process takes place with virtually no traction interruption during the shift. This avoids frequent acceleration and load changes when changing gears, resulting in more comfortable driving and a sportier driving style. In the gear arrangement described, for example, in DE 101 34 118 A1, the dual-clutch transmission has two transmission shafts (transmission input shafts) arranged coaxially with each other, to which on the one hand a friction clutch is assigned to each on the input side and on the transmission side A transmission gear set that assigns a set of gears, preferably even gears and on the other hand assigns odd gears and reverse. In th...

AI Technical Summary

Problems solved by technology

However, the problem with dual clutch transmissions is that the oil chambers must also be sealed against each other directly in the radially inner drive shaft from the radially outer drive shaft in the exit area of ​​the transmission housing, because the two oil chambers are sealed against each other through the gap between the shafts. annular gap junction

[0006] The disadvantage of this is that the radial shaft seal is loaded when the outer hollow shaft rotates

This has a detrimental effect on the tightness of the setup due to centrifugal force which can cause the sealing lip to lift off the central drive shaft

In addition, the construction of drains for venting and for leak detection is rather complex

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