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:
Feb. 05, 1991
Filed:
Apr. 28, 1989
Teruhisa Kohno, Itami, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A brake pressure control device introduces pump pressure which is produced by a pump (16) into piping which connects a master cylinder (4) and wheel brakes (11, 11', 12, 12'). The increase, decrease and retention of the wheel brake pressure are effected by utilizing the pump pressure. Absorbers (19, 19') which consume hydraulic fluid are installed in branches from piping which connects the master cylinder (4) and the wheel brakes (11, 11', 12, 12'). 4-port 2-position control valves (5, 5') are installed in the hydraulic passages which connect the master cylinder (4) and the absorbers (19, 19') and at the inlet port for the pump pressure and at the outlet port to the absorbers (19, 19'). The 4-port 2-position control valves (5, 5') selectively switch the hydraulic passages in such a manner that when the pump pressure is normal, they render conductive the hydraulic passage which connects the master cylinder (4) and absorbers (19, 19') but when the pump pressure fails and thereby decreases, they render conductive the hydraulic passage which connects the master cylinder (4) and wheel brakes (11, 11', 12, 12').