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:
May. 29, 1990
Filed:
Jun. 22, 1989
Honda Giken Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A hydraulic brake pressure control device for a vehicle including a casing having first and second cylinder portions in coaxial arrangement and a pillar-like cylinder projecting portion which projects into the first cylinder portion. A piston is disposed in the casing having first and second piston portions which are connected together and slidably fitted in the first and second cylinder portions, repsectively. A third cylinder portion in the piston is slidably fitted around the projecting portion. A spring is provided in the casing urging the piston in one direction. A control chamber is defined in the first cylinder portion and exerts, upon introduction of a liquid pressure thereinto, a pressing force onto the piston in the opposite direction. An input hydraulic pressure chamber is defined within the first and second cylinder portions to apply a pressing force to the piston in the one direction with a hydraulic pressure introduced thereinto and an output hydraulic pressure chamber is further defined in the third cylinder portion for exerting a pressing force to the piston in the opposite direction with an introduced hydraulic pressure. An oil passage is in the piston for communicating the input and output hydraulic pressure chambers. A valve mechanism is provided for closing the passage in response to movement of the piston in the opposite direction. This allows the pressure receiving area of the piston exposed to the input chamber to be easily made small irrespective of the provision of the valve mechanism, improving the piston responsiveness and making the whole device compact.