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US 4,456,310 AGranted
Hydraulic pump and anti-skid brake system
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsTsutomu Hayashi, Masaie Kato, Mitsuru Saito
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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsTsutomu Hayashi, Masaie Kato, Mitsuru Saito
Estimating the term…
A hydraulic pump with an unloading function which comprises a pump body, a spring chamber formed in the pump body and communicating with a fluid reservoir, a pump chamber formed in the pump body and communicating with the spring chamber and an accumulator through a suction valve and a delivery valve, respectively. An operation chamber is also formed in the pump body and accommodates a drive member such as a pump drive shaft. A plunger slidably extending through a first partition between the spring chamber and the pump chamber, and a tappet having a smaller diameter than that of the plunger and slidably extends through a second partition between the pump chamber and the operation chamber to abut against the plunger. A spring is accommodated in the spring chamber and is adapted to apply a predetermined resilient force to the plunger to bias it toward the tappet.
A hydraulic pump comprising a pump body including first and second partitions dividing said pump body into a spring chamber, a pump chamber and an operation chamber, said first partition being between said spring chamber and said pump chamber, said second partition being between said pump chamber and operation chamber, said spring chamber having a fluid inlet, suction valve means connecting said pump chamber and spring chamber for providing communication therebetween when said pump chamber is at a reduced pressure, delivery valve means connected to said pump chamber for delivering fluid therefrom when fluid in said pump chamber is at elevated pressure, a drive member in said operation chamber, a tappet slidably engaged in said second partition and driven by said drive member, a plunger slidably engaged in said first partition and disengagably contacted by said tappet, said plunger and tappet being operative in said pump chamber to increase and decrease the pressure of the fluid therein, said tappet having a smaller diameter than said plunger, and spring means in said spring chamber acting on said plunger for resiliently biasing the same against said tappet.
An anti-lock brake system for a vehicle having an engine, said brake system comprising:
An anti-lock brake system for a motorcycle having a frame, front and rear wheels on said frame, and a power unit including an engine mounted on said frame between said front and rear wheels, said anti-lock brake system comprising a wheel brake including an actuator for applying braking force to said wheels;
A method of operating a hydraulic pump in an anti-lock brake system of a vehicle, said method comprising driving a hydraulic pump from an engine of the vehicle for pumping pressure fluid from a reservoir to an accumulator to store pressurized fluid in said accumulator, supplying said pressurized fluid from said accumulator to a brake actuator to reduce braking torque applied to a braked wheel of the vehicle when incipient skidding of the braked wheel is detected, and halting the pumping of the pressure fluid to relieve load on the engine when pressurized fluid of a predetermined volume is stored in the accumulator.
Dependencies are inferred from the claim text.