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:
Jan. 29, 1991
Filed:
Dec. 29, 1989
Wilhelm Zirps, Hemmingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The pump having a housing with a bore for receiving a pump cylinder having a pump piston, which is drivable by a cam. An outlet valve housing is disposed, coaxially with the cylinder, in an enlarged portion of the bore. An annular chamber formed thereby encompasses the outlet valve and is closed off by a cap. The pump piston cylinder, the outlet valve and the cap are retained by a closure screw in the pump housing, which screw is screwed into the bore portion. In combination with a pump outlet bore embodied as a throttle, the annular chamber acts as a damper chamber for the brake fluid that in this type of pump is pumped discontinuously. Because of the damper chamber and pump outlet bore, pressure vibrations of the brake fluid reduced, and an impetus toward vibration of the vehicle body during a pump operation is avoided, so that noise generation in the interior of the vehicle is largely suppressed.