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:
Jul. 04, 1989
Filed:
Nov. 21, 1988
Jack Martinic, South Bend, IN (US);
Allied-Signal Inc., Morristown, NJ (US);
Abstract
A control valve (10) comprises a valve assembly (12) having a stepped bore (18) which communicates with a first inlet (30) from a master cylinder, a second inlet (40) from a pump, a first outlet (50) to a wheel brake, and a decay outlet (60) permitting fluid flow away from the first outlet (50) during decay of fluid pressure for anti-lock operation. A first valve element (31) comprises a reduced diameter section (20) extending into an enlarged diameter section (22) which is received within a correspondingly shaped enlarged diameter section (32) of the bore (18). The first valve element (31) includes a longitudinal through passage (35) with a restriction (43) therein, and a transverse fluid passage (37) which intersects the longitudinal through passage (35) and communicates with the enlarged diameter section (22) of the stepped bore (18). One end of the first valve element (31) comprises a valve seat (36) disposed adjacent a second valve element (70) that is operated by an actuator (14). A spring (80) extends between the first valve element (31) and second valve element (70) to bias the second valve element (70) toward a closed position at a valve seat (62) of the decay outlet (60). The first inlet (30) communicates fluid pressure from the master cylinder to the enlarged diameter section (22) of the bore (18) to effect fluid communication with the longitudinal through passage (35) separate from fluid pressure received from the pump and communicated through the second inlet (40) to a separate receiving chamber (44) defined between the enlarged diameter sections (22, 32) of the first valve element (31) and stepped bore (18).