Load conscious brake pressure control valve
AssigneeLucas Industries public limited company
InventorGlyn P. R. Farr
Life of this patent
Estimating the term…
Abstract
A load conscious brake pressure reduction valve is mounted between the suspension arm (1) and the suspension spring (5) of a vehicle. The control piston (8) of the valve is directly loaded with a force equal to the suspension spring load less the force of a compensating spring (12). To enable the valve to close against this load the area (A) of the control piston is made large. The movement required to effect valve closing is made small by careful control of the projection of the valve opening pin (26) and of the length of the valve seat member (20).
Claims11
A load conscious brake pressure control valve assembly comprising:
- a valve body;
- a brake fluid inlet in the valve body;
- a brake fluid outlet in the valve body;
- a control piston slidably mounted in the valve body for controlling communication between the inlet and the outlet, the control piston being urged by brake pressure within the valve body in the direction tending to isolate the outlet from the inlet;
- a rigid force transmitting spring seat rigidly and directly connected to the control piston and defining a seat for a vehicle suspension spring whereby, in use, the spring force of the suspension spring urges the control piston in the direction opposite to that in which it is urged by brake pressure within the valve body;
- and a compensating spring acting directly on the control piston in the sense to oppose the suspension spring whereby the net force applied to the control piston is equal to the difference between the force of the suspension spring and the force of the compensating spring.
Dependencies are inferred from the claim text.