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:
Oct. 01, 2002
Filed:
Jan. 29, 2002
Joachim Dietz, Frensdorf, DE;
Ina Walzlager Schaeffler oHG, , DE;
Abstract
A hydraulic camshaft adjusting device in a rotary piston design, which comprises a drive wheel ( ) that is drive-connected to a crankshaft and an impeller wheel ( ) connected in a rotationally fixed manner to a camshaft ( ), the drive wheel ( ) comprising a cavity formed by a peripheral wall ( ) and two lateral walls ( ), in which cavity at least one hydraulic working space is formed by at least two delimitation walls ( ), the impeller wheel ( ) has at least one radial blade ( ), and with each blade ( ) divides a hydraulic working space into two hydraulic pressure chambers, each blade ( ) of the impeller wheel ( ) is pressed by a spring element ( ), by its upper end surface ( ) against the peripheral wall ( ) of the drive wheel ( ) wherein each blade ( ) of the impeller wheel ( ) can additionally be pressed radially by the compressive force of the hydraulic pressure medium that can be selectively applied to its lower end surface ( ), by its upper end surface ( ) against the peripheral wall ( ) of the drive wheel ( ), the latter comprising, on one or both of its lateral surface(s), at least one additional pressure-medium channel ( ) starting from its lower end surface ( ).