Pressure fluid supply system for a variable camshaft adjustment

US5829399A · kind A · utility

Assignee

• INA Wälzlager Schaeffler oHG · DE

Inventors

• Martin Scheidt · Höchstadt an der Aisch, DE
• Dieter Goppelt · Herzogenaurach, DE
• Manfred Wilhelm · Weingarten, DE
• Eduard Golovatai-Schmidt · Hemhofen, DE

Key dates

• Filing date: Dec 11, 1996
• Grant date: Nov 3, 1998
• Expiry date: Dec 11, 2016

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2250/04
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

Apparatus for adjusting a rotational relation between a camshaft and a timing pulley of an internal combustion engine of a type having a crankshaft for driving the timing pulley and a cylinder head for rotatably supporting the camshaft, includes a housing receiving a double-acting piston for displacement in an axial direction between two axially spaced end positions and defining with the housing two pressure compartments. Secured to the piston is a control bushing which is geared to the timing pulley via a first gearing and operatively connected to the camshaft via a second gearing. A hydraulic regulating unit is fluidly connected to the pressure compartments via fluid-carrying passageways for alternately supplying a pressure fluid to the pressure compartments to effect an axial displacement of the piston and thereby a positional adjustment of the control bushing, with the fluid-carrying passageways including, for movement of the piston into one of the end positions, two axially spaced distribution spaces which are fluidly connected to each other by transition zones arranged in angularly offset disposition.