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. 25, 1988
Filed:
Dec. 24, 1986
Alfred Laffter, Laudenbach, DE;
Erich Neuthard, Hemsbach, DE;
Klaus Schlag, Birkenau, DE;
Helmut Schluter, Reichelsheim, DE;
Firma Carl Freudenberg, Weinheim, DE;
Abstract
A piston-cylinder cup-type tappet for an internal combustion engine comprises an outer housing defining a first cavity and a hollow piston having a second cavity with the hollow piston being disposed in the first cavity. An aperture provides for fluid flow between the first and second cavities. An inner housing is disposed in the first cavity with the inner housing defining a third cavity. The piston is received in the third cavity of the inner housing wherein the piston and the inner housing jointly define a throttle gap. A compression spring is disposed in the third cavity and supports the hollow piston and the inner housing. A check valve is disposed between the second and third cavities and permits fluid flow from the second cavity to the third cavity. A chamber is defined by the first cavity, the second cavity, the third cavity, the aperture and the throttle gap. An incompressible fluid fills this chamber. The chamber is closed off from the exterior thereof by a fluid impermeable wall and at least a portion of this wall adjacent the first cavity is designed as an elastically resilient spring bellows.