Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate
1996-10-10
2001-06-26
Oberleitner, Robert J. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C303S116400
Reexamination Certificate
active
06250724
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a brake hydraulic controller including normally open electromagnetic valves interposed between a master cylinder and wheel brakes, reservoirs, normally closed electromagnetic valves interposed between the wheel brakes and the reservoirs, return pumps for returning hydraulic fluid from the reservoirs to the master cylinder, dampers interposed between the master cylinders, and a common base which disposes all of the above described elements.
A conventional brake hydraulic controller of this type has already been disclosed in Unexamined Japanese Patent Publication No. Hei. 7-9970. In this brake hydraulic controller, normally opened electromagnetic valves and normally closed electromagnetic valves are mounted on one side of the base, and reservoirs are mounted on another side of the base. A cover having a sealing member is fitted to the base so as to render the normally opened electromagnetic valves and the normally closed electromagnetic valves waterproof and dustproof.
In the above described conventional brake hydraulic controller, the reservoirs are attached to the base with some of them uncovered. The formation of rust on the uncovered portion of the reservoirs resulting from exposure to water is not prevented. It is only necessary to cover the reservoirs with a cover having a sealing member in order to prevent the reservoirs from rusting away. As previously described, the reservoirs are mounted on the side of the base which is different from the side on which the normally closed electromagnetic valves and the normally open electromagnetic valves are mounted. For this reason, it is necessary to cover the reservoirs with another cover, which results in the number of components and the number of manhours to fit a reservoir cover to the base being increased.
SUMMARY OF THE INVENTION
The present invention has been made in view of the conventional problems, and an object of the present invention is to provide a brake hydraulic controller in which a structure for rendering normally opened electromagnetic valves, normally closed electromagnetic valves, reservoirs, and dampers waterproof is formed with a few number of components, and in which the number of manhours needed to assemble the waterproof structure is reduced.
The object of the invention is achieved, according to a first aspect of the present invention, by a brake hydraulic controller for controlling a hydraulic pressure from a master cylinder operative to a wheel brake, in which the controller includes a base, a normally open electromagnetic valve mounted on the base for connecting the master cylinder and the wheel brake, a reservoir mounted on the base, a normally closed electromagnetic valve mounted on the base for connecting the wheel brake and the reservoir, a return pump mounted on the base for returning hydraulic fluid received from the reservoir to the master cylinder, a damper mounted on the base and connected to the master cylinder and the return pump, and a cover attached to the base for covering the normally open and closed electromagnetic valves, the reservoir, and the damper with a surface of the cover, the cover including a seal groove and a sealing member fitted to the seal groove for elastically contacting the surface.
In addition to the elements as described in the first aspect of the present invention, a brake hydraulic controller according to a second aspect of the present invention is characterized by the fact that the cover is made from synthetic resin; the seal grooves are formed in a substantially U-shaped cross section and is made up of an innermost closed surface and a pair of side surfaces connected to both sides of the innermost closed surface substantially at right angles; and the cover includes a reinforcing member which is made of rigid material so as to form at least one of the innermost closed surface and the pair of side surfaces.
In addition to the elements as described in the second aspect of the present invention, a brake hydraulic controller according to a third aspect of the present invention is characterized by the fact that the reinforcing member is embedded in the cover.
In addition to the elements as described in the third aspect of the present invention, a brake hydraulic controller according to a fourth aspect of the present invention is characterized by the fact that a cylindrical portion is integrally formed in the reinforcing member while one end of the cylindrical portion abuts against the surface of the base; and a lock head of a fastening bolt which is screwed to the base through the cylindrical portion is engaged with the other end of the cylindrical portion.
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patent: 5466055 (1995-11-01), Schmitt et al.
patent: 5482362 (1996-01-01), Robinson
patent: 5634695 (1997-06-01), Ohta et al.
patent: WO 94/26568 (1994-11-01), None
patent: 44 05 918 A1 (1995-08-01), None
patent: 0 675 030 A2 (1995-10-01), None
patent: 0 675 030 A3 (1995-10-01), None
patent: 79970 (1995-01-01), None
Amano Tsutomu
Kobayashi Masashi
Ohta Kazuhiro
Shimizu Shuichi
Lipka Pamela J.
McGuireWoods LLP
Nissin Kogyo Co. Ltd.
Oberleitner Robert J.
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