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:
May. 22, 2018
Filed:
Oct. 31, 2014
Schaeffler Technologies Ag & Co. KG, Herzogenaurach, DE;
David Koehler, Egloffstein, DE;
Schaeffler Technologies AG & Co. KG, Herzogenaurach, DE;
Abstract
A control valve for a camshaft adjuster is provided. The control valve contains a hollow cylindrical control piston, which has radially arranged piston openings on a piston head of the control piston, which piston head has a reduced diameter in comparison with the adjacent segment. Pressure medium flows along the outer cylindrical surface of the control piston, reaches into the piston openings, and causes a flow force that depends on the relative position of the control piston in the circumferential direction. For the purpose of weakening this dependence, the piston openings and sleeve openings are distributed over the circumference, wherein the angle between the axes of the piston openings differs from the angle between the axes of the sleeve openings and wherein the same angle range covered by the piston openings and sleeve openings at the same time, in dependence on the position of the control piston in relation to the control sleeve, remains approximately the same.