Hydraulic play compensation element for a valve gear of an internal combustion engine

US6718923B2 · kind B2 · utility

Assignee

• Mahle Ventiltrieb GmbH · DE

Inventors

• Rainer Barth · Stuttgart, DE
• Oliver Fritz · Landshut, DE
• Volker Korte · Bissingen, DE
• Martin Lechner · Lindlar, DE
• Christoph Steinmetz · Ludwigsburg, DE

Key dates

• Filing date: Jan 31, 2003
• Grant date: Apr 13, 2004
• Expiry date: Jan 31, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L13/0031
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The aim of the invention is to functionally improve a hydraulic play compensation element for a valve gear of an internal combustion engine. To this end, the play compensation element is characterized by the following features. Both components (4; 6) enclose a pressure chamber (7) between them, which is sealed from the exterior and which has a volume that depends on the relative position of both components (4; 6). A pressure spring (5) that presses both components (4; 6) away from one another is mounted inside the pressure chamber (7). The pressure chamber (7) can be connected to the storage chamber (8) via a spring-loaded one-way valve (10) through which media can flow exclusively into the pressure space. An additional controllable stop valve (11) is provided in the connection of the pressure chamber (7) to the storage chamber (8). A throttling channel (17), which serves as a bypass to the one-way valve (10), is provided between the pressure chamber (7) and the controllable stop valve (11). The throttling channel (17) is connected to a reversibly size-changing buffer chamber (22).