Fluid-pressure and analogous brake systems – With pump – Pressure control
Reexamination Certificate
1999-03-24
2001-10-02
Oberleitner, Robert J. (Department: 3613)
Fluid-pressure and analogous brake systems
With pump
Pressure control
C060S591000, C060S592000
Reexamination Certificate
active
06296324
ABSTRACT:
FIELD OF THE INVENTION
This invention generally relates to a vehicle brake fluid operating system. More particularly, the present invention pertains to a vehicle brake fluid pressure generating device.
BACKGROUND OF THE INVENTION
A known type of brake fluid pressure generating device is disclosed in, for example, Japanese Patent Laid-Open Publication No. 9-315288. In this known brake pressure generating device, a master cylinder piston has a first master cylinder piston, a second master cylinder piston and an engage member. The first master cylinder piston and the second master cylinder piston are slidable relative to each other. When the second master cylinder piston moves toward the first master cylinder piston, the engage member engages the first master cylinder piston. One end of each of the first and the second master cylinder pistons is accommodated in a power chamber. The other ends of the first and second master cylinder pistons are accommodated in a pressure chamber. When a power fluid pressure that is generated by the supplemental fluid pressure source is sufficient, the master cylinder is driven by the regulator fluid pressure in response to the depression of a brake pedal. When a power fluid pressure that is generated by the supplemental fluid pressure source is not sufficient, the master cylinder is driven in a normal manner in response to the depression of the brake pedal. Instead of this condition, the master cylinder generates an appropriate fluid pressure.
However, this known brake fluid pressure generating device suffers from the following drawbacks and disadvantages. If the brake fluid pressure generating device experiences problems with respect to the master cylinder, the magnitude of the regulator pressure typically does not change as a result of operation of the brake pedal. As a result, the braking force that is generated by the wheel cylinders decreases.
A need thus exists for a brake pressure generating device that is able to generate a bigger magnitude regulator pressure when the master cylinder is in a disabled condition.
SUMMARY OF THE INVENTION
The present invention provides a brake fluid pressure generating device that includes a master cylinder piston slidably disposed in a cylinder body, a pressure chamber and a power chamber formed in the cylinder body, a master cylinder that generates a master cylinder fluid pressure in response to operation of a brake pedal, a supplemental fluid generator that generates a power fluid pressure, a fluid regulator that regulates the power fluid pressure to a regulator fluid pressure in response to operation of the brake pedal, a pressure increase valve that controls communication between the supplemental fluid generator and the power chamber, and a pressure release valve that controls communication between the power chamber and a reservoir tank. A valve operating force generating member controls the pressure increase valve and the pressure release valve, a first repulsion force generating member is controlled in response to the regulator fluid pressure and a second repulsion force generating member is controlled in response to the master cylinder fluid pressure.
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Nishii Michiharu
Oishi Masaki
Aisin Seiki Kabushiki Kaisha
Burch Melody M.
Burns Doane , Swecker, Mathis LLP
Oberleitner Robert J.
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