Antilock liquid-pressure control apparatus

• US 5,725,286 A
• Filed: 08/09/1996
• Issued: 03/10/1998
• Est. Priority Date: 08/09/1995
• Status: Expired due to Fees

• Current Assignee: Akebono Brake Industry Company Limited (Akebono Brake Corporation)
• Original Assignee: Akebono Brake Industry Company Limited (Akebono Brake Corporation)
• Inventors: Sekiguchi, Akihiko
• Primary Examiner(s): Butler, Douglas C.
• Application Number:
  US08/694,702
• Time in Patent Office: 578 Days
• Field of Search: 303/116.1, 303/116.2, 303/116.3, 303/116.4, 303/115.1, 303/115.3, 303/115.4, 303/115.5, 303/68, 303/61, 303/117.1, 303/119.1, 303/900, 303/901 , 303/84.1, 303/84.2
• US Class Current: 303/115.4
• CPC Class Codes: B60T 8/4225 having a fluid actuated expansion unit
• CPC Class Codes: B60T 8/5043 debooster systems

Abstract

An antilock liquid-pressure control apparatus includes a first liquid-pressure control mechanism and a second liquid-pressure control mechanism. A second liquid chamber in the first liquid-pressure control mechanism is communicatively connected to a wheel cylinder, and through a check valve to a pressure chamber of a master cylinder. A first liquid chamber in the first liquid-pressure control mechanism is communicatively connected to a discharge port of a liquid pressure pump and a liquid chamber in the second liquid-pressure control mechanism, through a flow control valve, and further to a reservoir through a decay valve. A spring container in the second liquid-pressure control mechanism communicates with the pressure chamber of the master cylinder. In a pressure reduction mode of the antilock control, the brake liquid is sucked from the first liquid chamber by the liquid pressure pump, and the sucked brake liquid is accumulatively pressurized in the liquid chamber of the record control mechanism, and the brake liquid is returned from the spring container to the master cylinder. In a pressure reapplication mode of the antilock control, the brake liquid is supplied from the liquid chamber of the record control mechanism to the first liquid chamber, through the flow control valve.

Claims

1. An antilock liquid-pressure control apparatus comprising:

a first liquid-pressure control mechanism, an inner space thereof being partitioned into a first liquid chamber and a second liquid chamber by a piston;

a second liquid-pressure control mechanism, an inner space thereof being partitioned into a liquid chamber and a spring container by a piston;

wherein said second liquid chamber in said first liquid-pressure control mechanism is communicatively connected to a wheel cylinder and a pressure chamber of a master cylinder through a valve mechanism which closes a flow path only when an antilock control is executed, said first liquid chamber in said first liquid-pressure control mechanism is communicatively connected to a discharge port of a liquid pressure pump and said liquid chamber in said second liquid-pressure control mechanism through a flow control valve and further to a reservoir through a decay valve, and said spring container in said second liquid-pressure control mechanism communicates with said pressure chamber of said master cylinder, and

wherein in a pressure reduction mode of said antilock control, brake liquid is sucked from said first liquid chamber by a liquid pressure pump, and said sucked brake liquid is accumulatively pressurized in said liquid chamber of said second liquid-pressure control mechanism, and said brake liquid is returned from said spring container to said master cylinder, and in a pressure reapplication mode of said antilock control, said brake liquid is supplied from said liquid chamber of said second liquid-pressure control mechanism to said first liquid chamber, through said flow control valve.

2. The antilock liquid-pressure control apparatus according to claim 1, wherein said flow control valve includes a sleeve having a side port comprising an opening and a valve body having an orifice and being slidable within said sleeve, wherein the area of the opening of said side port is varied with the movement of said valve body.

3. The antilock liquid-pressure control apparatus according to claim 2, wherein said flow control valve further includes a spring for urging one end of said valve body, said side port is connected to said first liquid chamber, and the other end of said valve body is connected to said discharge port of said liquid pressure pump.