Shift element sub-assembly for a transmission

US6968935B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Eberhard Biermann · Überlingen, DE
• Georg Gierer · Kreßbronn, DE

Key dates

• Filing date: Jun 25, 2002
• Grant date: Nov 29, 2005
• Expiry date: Jun 25, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16D2021/0692
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A shift element sub-assembly for a transmission having two axially adjacent shift elements (2, 3) that are located in a transmission housing (1). The discs of both shift elements (2, 3) lie axially adjacent in the interior of the disc carrier (4) and are separated from one another by a central partition (40) of the disc carrier (4). Each shift element (2, 3) has a piston (23, 33) and a closing pressure chamber (24, 34), and at least one resetting element (27, 37, 39) for resetting the piston. Additionally, each shift element (2, 3) has a secondary piston (26, 36), which acts on the discs of each shift element (2, 3) in opposition to a resetting force of the resetting element (27, 37, 39) of each shift element (2, 3), via the piston (23, 33) of each shift element (2, 3), and at least one resetting element (27, 37, 39) of the shift element sub-assembly is configured as a drain pressure chamber (27, 37) that can be hydraulically or pneumatically actuated.