Control valve assemblies for hydraulic braking systems

Details Control valve assemblies for hydraulic braking systems Control valve assemblies for hydraulic braking systems

1981-05-28

1983-10-11

Butler, Douglas C.

Fluid-pressure and analogous brake systems

Multiple fluid-receiving devices

Multiple motors

60581, 188 16, 188354, B60T 1300

Patent

active

044088051

ABSTRACT:
In a dual hydraulic braking system in which brakes on opposite sides of a vehicle can be applied simultaneously for retarding or independently for steering the vehicle, a dual control valve assembly ensures that the brakes on one side cannot be applied before the brakes on the opposite side. When the brakes on one side are to be applied independently, a stem carrying inlet and exhaust valve heads moves with a pedal-operated piston so that the exhaust valve head engages with a valve spool to close an exhaust passage. The spool moves with the piston and head until it is arrested by a stop face, whereafter a seating on the piston moves away from the inlet valve head to allow pressurized fluid to be supplied to the outlet for the brakes. When the brakes are to be applied simultaneously, a volume of fluid trapped in a transfer connection between the exhaust valve heads arrests movement of the spools to ensure that the inlet valves open simultaneously.

REFERENCES:
patent: 3568441 (1971-03-01), Walker
patent: 3640067 (1972-02-01), Ingram
patent: 4178757 (1979-12-01), Ketterling et al.

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