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:
Jun. 16, 1998
Filed:
Jun. 03, 1997
Hermann Wiehl, Herzogenrauch, DE;
INA Waelzlager Schaeffler oHG, Herzogenaurach, DE;
Abstract
A device for continuously adjusting an angular orientation of a camshaft relative to a crankshaft of an internal combustion engine, includes a housing, an adjusting piston dividing the housing into two pressure compartments and reciprocating in the housing between two end positions in response to operation of a pressure fluid circuit, and a sliding sleeve connected in one piece to the adjusting piston. The sliding sleeve has a first toothed section in mesh with a drive wheel that is in driving relationship with the crankshaft, and a second toothed section in engagement with a toothed bushing that is securely fixed to the camshaft. The toothed sections are formed as helical gears so that an axial displacement of the adjusting piston effects a relative rotation between the drive wheel and the camshaft. In one end position, which represents a starting phase, with the internal combustion engine being at a standstill, the adjusting piston is subjected to a retention force so as to be securely held in place whereby the retention force can be overcome during the starting phase only after buildup of a sufficient pressure in the respective pressure compartment.