Valve-actuating mechanism

US5535704A · kind A · utility

Assignee

• AUDI AG · DE

Inventor

• Michael Paul · Passau, DE

Key dates

• Filing date: Mar 28, 1995
• Grant date: Jul 16, 1996
• Expiry date: Mar 28, 2015

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L1/267
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A valve-actuating mechanism for a multicylinder internal combustion engine has, for each inlet valve of a cylinder, a low engine speed cam and a high engine speed cam. A first rocker arm cooperates with the low engine speed cam and the valve, while a second rocker arm cooperates only with the high engine speed cam and in the high engine speed range can be coupled to the first rocker arm in order to operate the valve in accordance with the contour of the high engine speed cam. The coupling between the first and second rocker arms is effected by means of a piston which can be moved by a pressure medium and which is acted on by the latter only when sufficient time remains to bring the piston into its coupling position before the commencement of the lifting phase of the valve in question.