Hydraulic anti-locking braking systems for vehicles

Details Hydraulic anti-locking braking systems for vehicles Hydraulic anti-locking braking systems for vehicles

1996-01-22

1997-10-21

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

3031161, 3031192, B60T 832

Patent

active

056789025

ABSTRACT:
In a hydraulic anti-lock braking system a flow control valve operates with a single-acting solenoid operated valve (35) and the flew control valve incorporates a spool (17) working in a bore (8) in a housing (7) with the flow directed through a passage (20) passing substantially through the center of the spool (7). A fixed orifice (21) is located at the one end of the spool which defines a chamber (19) for a control spring (18), and a variable orifice is defined between a port (33) in the housing (7) end a metering edge on the input side of an annular groove (24) in the spool (17) and which communicates with the passage (20) in the spool (17). A chamber containing the spring (18) being of a larger bore than the bore containing the spool (17).

REFERENCES:
patent: 4915459 (1990-04-01), Hashida et al.
patent: 5002344 (1991-03-01), Hashida
patent: 5026123 (1991-06-01), Nokubo et al.
patent: 5094512 (1992-03-01), Kohno et al.
patent: 5445447 (1995-08-01), Farr et al.

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