The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 16, 2003
Filed:
Jul. 12, 2002
Thomas Bertelshofer, Ebermannstadt, DE;
Gerd Wiessner, Neustadt/Aisch, DE;
Jurgen Schwab, Rottenbach, DE;
Thomas Kleiber, Hirschaid, DE;
INA-Schaeffler KG, Herzogenaurach, DE;
Abstract
A device ( ) for hydraulic rotational angle adjustment of a camshaft relative to a crankshaft of an internal combustion engine including a drive unit ( ) connected with the crankshaft and an output unit ( ) non-rotatably connected with the camshaft. The drive unit ( ) stands in power transmitting connection with the output unit ( ) through at least two pressure chambers ( ) formed inside the device ( ) which bring about, under action by pressure under continuous compensation for external pressure leakages, a relative rotation or a hydraulic clamping of the output unit ( ) in relation to the drive unit ( ). In addition, the device ( ) has a coil spring ( ) arranged outside the device which is provided for adaptation of its adjustment speeds in both adjustment directions. The coil spring ( ) is arranged via enclosure in an additional housing ( ) in a closed annular space which is completely fillable with the external pressure medium leakages of the device ( ), whereby the hydraulic pressure medium acts at the same time as a damping agent against sympathetic resonant vibrations of the spring turns ( ) of the coil spring ( ) resulting from vibrations of the internal combustion engine.