DEVICE FOR CHANGING THE CONTROL TIMES OF GAS EXCHANGE VALVES OF INTERNAL COMBUSTION ENGINE, PARTICULARLY ROTARY PISTON ADJUSTMENT DEVICE FOR ROTATION ANGLE ADJUSTMENT OF A CAMSHAFT RELATIVE TO A CRANKSHAFT

US6805080B2 · kind B2 · utility

Assignee

• Ina Schaeffler KG · DE

Inventors

• Eduard Golovatai-Schmidt · Hemhofen, DE
• Jens Schafer · Herzogenaurach, DE
• Andreas Strauss · Forchheim, DE
• Martin Scheidt · Höchstadt an der Aisch, DE

Key dates

• Filing date: Oct 15, 2002
• Grant date: Oct 19, 2004
• Expiry date: Oct 15, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L2001/34469
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A device for changing the control times of gas exchange valves of an internal combustion engine, including a drive wheel in driving connection with a crankshaft and a vane wheel connected to rotate with a camshaft. A plurality of hydraulic working spaces are formed within the device and are divided by the vanes of the vane wheel into respectively A and B pressure chambers. The vane wheel can be mechanically coupled to the drive wheel by a locking element, which is displaceable by a spring element into a locking position within a seat in one of the sidewalls of the drive wheel, and is hydraulically moved into an unlocked position in the vane wheel upon application of pressure to the pressure chambers. The locking element is a generally uniform cylindrical locking pin, and is arranged in an axial bore in the hub of the vane wheel. The longitudinal axis of the axial bore has a smallest possible distance from the longitudinal mid-axis of the device. The seat has a generally quadrilateral shaped contour that is larger by a play on all sides than the cross sectional area of the locking element, and includes a worm groove opening into it for supplying pressure medium.