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. 15, 2019
Filed:
Jan. 14, 2016
Schaeffler Technologies Ag & Co. KG, Herzogenaurach, DE;
Markus Fischer, Hessdorf, DE;
Schaeffler Technologies AG & Co. KG, Herzogenaurach, DE;
Abstract
A hydraulic tensioning device for a chain device, having a housing and having a clamping piston guided displaceably in a housing bore of the housing, the clamping piston having a piston cavity with a hardened inner circumferential surface, and also having a pressure relief valve unit arranged in the piston cavity. The pressure relief valve unit () is a preassemblable unit and includes a spring (), a closing body () and a valve seat () and also a receptacle () at least partially enclosing the valve seat (), wherein the valve seat () is made of a metal material, has an at least partially hardened surface and wherein the receptacle () forms a press-fit with the inner circumferential surface of the clamping piston ().