Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate
1998-07-20
2001-09-25
Graham, Matthew C. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C303S119300, C137S088000
Reexamination Certificate
active
06293634
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a hydraulic brake control device for a motor vehicle with an antilock brake control system or a traction control system. More specifically, this invention provides a hydraulic brake control device which improves a holding means for a coil unit of a solenoid valve.
A known hydraulic brake control device is an integral type device which comprises a hydraulic unit with a plural number of solenoid valves and an electronic control unit.
Each solenoid valve comprises a valve unit having the valve mechanism within a dome-shaped sleeve and a donut-shaped coil portion provided outside the valve unit. In order to assemble the solenoid valve, the valve unit is installed in a valve block of the hydraulic unit; the coil unit is installed in a cover of the electronic control unit; and the cover is assembled onto the valve block. This type of hydraulic brake control device is disclosed in the Japanese Opened Public Patent Application Number Heisei 7-215192.
In the above-described hydraulic brake control device, the coil unit is elastically supported between the top portion of the coil unit and the case via a spring material. A lead wire from the coil unit is extended through the lid portion of the case to be directly connected to the control board provided on the top surface of the case.
The above-described hydraulic brake control device has the following problems.
The hydraulic unit and the electronic control unit are individually manufactured and then assembled. The elastic effect of the spring becomes effective only after the coil unit is assembled on the valve block. Therefore, the coil unit is freely movable when transporting the electronic control unit with the coil unit before assembly with the hydraulic unit.
Accordingly, during transportation, the coil may move freely about which can apply a pulling force on the lead wire. In this manner, the electric connection of the lead wire may easily be broken.
Assembling the coil unit with or disassembling the coil unit from the valve unit can cause a compressive force or a pulling force on the lead wire, which could be a cause of breakage of the lead wire as well as breakage of the electric connection between the lead wire and the control board.
Thus, a special treatment must be done to provide a holding mechanism between the coil unit and the housing of the case during transport prior to assembly, which increases the cost of the device.
OBJECTS AND SUMMARY OF THE INVENTION
This invention is to resolve the above-identified problems, and to that end, this invention provides a hydraulic brake control device, which has a simple structure to hold the coil unit.
A further object of this invention is to provide a hydraulic brake control device, which prevents the electric connection of the lead wire of the coil unit from being broken, thereby assuring a long lasting electric connection.
The first aspect of the invention is to provide a hydraulic brake control device, which comprises a hydraulic unit with a valve unit of a solenoid valve, a control board installed in a cover covering one side surface of the hydraulic unit, and an electronic control unit with a coil unit of the solenoid valve, wherein a coil holding board, elastically contacted with a bottom portion of the coil unit, is installed at the opening side of the cover and the coil unit is frictionally engaged by the coil holding board and a lid of the cover.
The second aspect of the invention is to provide a hydraulic brake control device, which comprises a hydraulic unit with a valve unit of a solenoid valve, a control board installed in a cover covering one side surface of the hydraulic unit, and an electronic control unit with a coil unit of the solenoid valve, wherein a coil holding board is installed at the opening side of the cover, the coil unit is installed between a lid of the cover and the coil holding board, an elastic material is inserted between a top portion of the coil unit and the lid or between a bottom portion of the coil unit and the coil holding board, and the coil unit is frictionally engaged by the coil holding board and the lid.
The third aspect of this invention is to provide an hydraulic brake control unit as above, wherein a plural number of protuberances fix the position of the coil unit at the lid of the cover and the coil holding board.
The fourth aspect of this invention is to provide a hydraulic brake control unit as above, wherein protuberances are formed on one side of the coil holding board and the coil holding board has an elastic effect by being abutted against the bottom surface of the coil unit or a valve block of the hydraulic unit via the protuberances.
The fifth aspect of this invention is to provide a hydraulic brake control unit as above, wherein protuberances are formed on both surfaces of the coil holding board and the coil holding board has an elastic effect by being abutted against a bottom surface of the coil unit and a valve block of the hydraulic unit via the protuberances.
The sixth aspect of this invention is to provide a hydraulic brake control unit as above, wherein a hole is formed in the lid of the cover, into which a convex portion of the coil unit is engaged and the rotation of the coil unit is restricted by the engaging of the convex portion of the coil unit into the hole of the lid of the cover.
The seventh aspect of this invention is to provide a hydraulic brake control unit as above, wherein a hole is formed in the lid of the cover, into which a convex portion of the coil unit is engaged, the rotation of the coil unit is restricted by the engaging of the convex portion of the coil unit into the hole of the lid of the cover, and an elastic material with a sealing effect is provided between the lid of the cover and the top of the coil unit.
The eighth aspect of this invention is to provide a hydraulic brake control unit as above, wherein a cavity is formed on the inner circumference of the side surface of the cover, and the periphery of the coil holding device is engaged in the cavity.
REFERENCES:
patent: 5386337 (1995-01-01), Schoetl
patent: 5439279 (1995-08-01), Linkner, Jr. et al.
patent: 5820228 (1998-10-01), Schneider et al.
patent: 5823507 (1998-10-01), Inden et al.
patent: 5842753 (1998-12-01), Staib et al.
patent: WO 94/25320 (1994-11-01), None
Arent Fox Kintner & Plotkin & Kahn, PLLC
Graham Matthew C.
Nisshinbo Industries Inc.
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