Double clutch and driving system provided with same

By using an axially fixed internal friction plate design and electro-hydraulic actuation, the problems of wear and stress exceeding limits in traditional dual clutches at high speeds are solved, achieving efficient, compact torque distribution and reliability in electric drive systems.

CN122122404APending Publication Date: 2026-05-29MERCEDES BENZ GRP
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Patent Information

Application Number
CN202480070557.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-11-29
Filing Date
2024-09-03
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Traditional dual clutches suffer from high losses and component stress exceeding critical levels due to centrifugal force at high speeds, making them difficult to apply in electric drive systems.

Method used

The design employs an axially fixed internal friction plate, with the friction area connected by an elastic connecting plate. The piston chamber is arranged on the rear wall of the piston chamber and at the support of the internal friction plate. Low-loss operation is achieved by using electro-hydraulic actuation, and centrifugal force is compensated by a centrifugal oil chamber to ensure the reliability and accuracy of piston movement.

Benefits of technology

It achieves reliability and accuracy at high speeds (such as 20,000 rpm), reduces the number of friction plates, lowers the torque transmission requirements, realizes a compact structure and torque vector distribution, and avoids the high losses and component stress problems in traditional designs.

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Abstract

The invention relates to a dual clutch (10) and a drive system having a first clutch (12a) and a second clutch (12b), the first clutch (12a) and the second clutch (12b) being actuatable by means of hydraulic pistons (28a, 28b) against respective spring forces (44a, 44b), the first clutch (12a) and the second clutch (12b) being arranged coaxially and substantially mirror-symmetrically, the first piston chamber (34a) and the second piston chamber (34b) of the clutches (12a, 12b) have a common piston chamber rear wall (14), a first outer friction plate (26a) of the first clutch (12a) is connected in a rotationally fixed manner to a first outer friction plate carrier (30a), and a second outer friction plate (26b) of the second clutch (12b) is connected in a rotationally fixed manner to a second outer friction plate carrier (30b), the first inner friction plate (22a) and the second inner friction plate (22b) are connected in a rotationally fixed manner to a common inner friction plate support (20), characterized in that the first inner friction plate (22a) and the second inner friction plate (22b) are fixed in an axially fixed manner on the inner friction plate support (20) and each have an inner fixing region (45) and a radially outer friction region (49), the piston chamber rear wall (14) and the piston (28a, 28b) are arranged axially between a first inner friction plate (22a) and a second inner friction plate (22b), which are connected via a number of elastic connecting webs (51) such that, in the engaged state, the friction region (49) is offset axially relative to the fastening region (45) when the connecting webs (51) are elastically deformed, and wherein the piston chamber rear wall (14) and the piston (28a, 28b) are arranged axially between the first inner friction plate (22a) and the second inner friction plate (22b), and wherein the piston chamber rear wall (14) and the piston (28a, 28b) are arranged axially between the first inner friction plate (22a) and the second inner friction plate (22b). The piston chamber rear wall (14) is supported on the inner side on the inner plate bearing (22). This makes it possible for the friction plate clutch to be used in a high rotational speed range including the drive motor.
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