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:
Jun. 06, 2000
Filed:
Mar. 13, 1998
Chiharu Nakazawa, Kawasaki, JP;
Inisia Jecs Corporation, Atsugi, JP;
Abstract
A brake circuit is provided for providing a fluid communication between a master cylinder and a brake cylinder of a road wheel. A fluid pressure control valve is installed in the brake circuit for controlling the fluid pressure in the brake cylinder. A reservoir is connected to a discharge circuit extending from the fluid pressure control valve. A pump includes a cylinder member, a plunger movably disposed in the cylinder member to define a volume variable pressure chamber, and a seal member operatively disposed between the cylinder member and the plunger to hermetically insulating the pressure chamber. A first inlet circuit conveys the brake fluid in the reservoir to the pressure chamber of the pump, a second inlet circuit conveys the brake fluid in the master cylinder to the pressure chamber of the pump, and an outlet circuit conveys the brake fluid in the pressure chamber of the pump to the fluid pressure control valve. An outside gate valve selectively opens and closes the brake circuit. An inside gate valve selectively opens and closes the second inlet circuit. A control unit controls the fluid pressure control valve, the pump and the outside and inside gate valves for carrying out an antilock brake control and a vehicle motion stabilizing control. The cylinder member of the pump is formed with an opening through which the second inlet circuit is fluidly communicated with the pressure chamber of the pump. The opening is exposed to the pressure chamber even when the plunger takes a deepest position in the cylinder member to minimize the size of the pressure chamber.