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:
Mar. 22, 1994
Filed:
Feb. 03, 1993
Klaus Dohring, Heidelberg, DE;
Wolfgang Krause, Waibstadt, DE;
Firma Carl Freudenberg, Weinheim/Bergstr, DE;
Abstract
A hydraulic valve play equalization element for the valve drive of an internal combustion engine is disclosed. The equalization element comprises an inner tappet and an outer tappet arranged to move relative to one another in the axial direction. The outside tappet is formed by an essentially cup-shaped housing with a level bottom and the inside tappet and the outside tappet delimit an oil-filled storage space which is sealed towards the outside and which can change in volume. A displacement element to equalize volume changes is enclosed in the storage space. The outside tappet is formed by an essentially tube-shaped mantle of thermoplastic material, which has slide surfaces radially inside and outside. The mantle is closed off with a fluid seal, by a disk structured as an expeller, in the direction of a cam shaft that is used. The inside slide surface encloses the inside tappet, resting against its circumference, and forming a fluid seal.