Apparatus for adjusting a rotational angular relationship between a camshaft and its drive element

US5056477A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ernst Linder · Mühlacker, DE
• Helmut Rembold · Stuttgart, DE

Key dates

• Filing date: Jul 6, 1990
• Grant date: Oct 15, 1991
• Expiry date: Jul 6, 2010

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2001/34483
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An apparatus for adjusting an angular rotational relationship of a camshaft, serving in particular to actuate gas exchange valves of an internal combustion engine, with respect to its drive element, which apparatus has two control motors acting counter to one another, the mutually corresponding movable walls of which are coupled to one another, wherein to reduce an expense for furnishing control fluid and generating pressure in this control fluid the work chambers of the control motors are on the one hand both connected via a respective check valve, to a control fluid pressure source and on the other hand can be made to communicate selectively with one another directly via a control valve or can be disconnected from one another via this valve, so that torque fluctuations of the camshaft are exploited for generating pressure in one of the work chambers at a time and the resultant pressure is exploited purposefully at certain times for adjustment with subsequent relocking of the work chambers.