Actuator for an automated or automatic transmission, and method for controlling the actuator

US11060538B2 · kind B2 · utility

Assignee

• WABCO GmbH · DE

Inventors

• Romain Poux · Hannover, DE
• Timo Gerlach · Hannover, DE
• Dennis Reimann · Hannover, DE

Key dates

• Filing date: Mar 20, 2018
• Grant date: Jul 13, 2021
• Expiry date: Jul 2, 2038

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B11/123
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

An actuator (1) for an automated or automatic transmission has a cylinder housing (3), a piston unit (2), and a piston rod (13). The piston unit (2) is coupled to the piston rod (13) and is arranged movably in the cylinder housing (3) along a longitudinal axis (4). The piston unit (2) separates two pressure chambers (8, 9) of variable volume in the cylinder housing (3). The pressure chambers are configured to load the piston unit (2) with compressed air on both sides. The two pressure chambers (8, 9) are connected to a valve unit (14) for switching between pressurization and purging of each of the two pressure chambers (8, 9). An end stop clamping device for damping at least one end stop of the piston unit (2) is arranged in the actuator (1). A pneumatically and a mechanically operating damping stage are provided improve the end stop damping device.