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:
Sep. 19, 2000
Filed:
Jan. 18, 2000
Walter Speil, Ingolstadt, DE;
Ina Walzlager Schaeffler oHG, Herzogenaurch, DE;
Abstract
A hydraulic clearance compensation element actuated by a cam of a camshaft and adapted for use with a valve drive, includes a casing closed on one end by a bottom which bears upon one end of a gas exchange valve, a pressure piston so received in the interior of the casing that a leakage gap for hydraulic fluid is formed between an outer surface area of the pressure piston and an adjacent side wall of the casing for enabling the clearance compensating function. The pressure piston and the casing are movable relative to one another in axial direction, with a high pressure chamber being defined between the bottom and a confronting end face of the pressure piston for receiving a hydraulic fluid. In order to provide the leakage gap of optimum size over the entire temperature range adjacent structural components of the pressure piston and the casing in the area of the leakage gap are configured in accordance with the following equation: ##EQU1## wherein C is a characteristic ratio number,