B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
B60T 8/28 (2006.01)
Patent
CA 2054713
2054713 9013462 PCTABS00002 A deceleration conscious brake pressure reducing valve assembly comprises a valve body (2) defining an inlet chamber (3) and an outlet chamber (4) connected by way of passages (9, 10) formed in a piston (7). A ball (15) is mounted within a cage portion (16) of the piston and rests on an inclined ramp surface (17). A valve member (13) is provided for closing the passage (11) by engagement with the seat (12) formed on the piston (7). A spring (9) maintains the components in the illustrated position until the outlet pressure acting over area A0 is sufficient to overcome the force of spring (9). If at this point deceleration of the vehicle has reached a predetermined level, the piston (7) will move to the left and the ball (15) will run up the ramp (17) in order to close the valve (13). If, however, the vehicle is heavily laden so that the pressure at which the piston (7) starts to move is insufficient to produce a deceleration which will move the ball (15) up to the ramp (17), the piston (7), ball (15), and valve (13) will move as a unit to the left and the passage (11) will remain open. The ball (15) will run up the ramp (17) to close the valve (13) when system pressure produces sufficient deceleration. At pressures above cut-in pressure the valve acts as a metering valve to provide a progressive increase in outlet pressure as the inlet pressure rises. The valve is unable to close, regardless of vehicle deceleration or attitude, at pressures below that necessary to move the piston (7) against the force of spring (9). The ball (15) is substantially isolated from hydraulic fluid flow and is accordingly unaffected by changes in fluid viscosity. In the event of very rapid piston (7) movement the inertia of the ball (15) holds the valve member (13) in the illustrated position to ensure rapid closure of the valve.
Farr Glyn P. R.
Lucas Industries Public Limited Company
Sim & Mcburney
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