B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
137/2, 303/87
B60T 8/28 (2006.01) B60T 8/26 (2006.01)
Patent
CA 1277357
DECELERATION AND PRESSURE SENSITIVE PROPORTIONING VALVE WITH LOW DECELERATION RESPONSIVENESS. ABSTRACT OF THE DISCLOSURE A proportioning valve assembly (10) in a housing (12) is pressure responsive to control the flow of fluid to a wheel brake cylinder. The proportioning valve (20) is connected to a channel (31) opening into a reservoir or fluid-containing chamber (13), a second valve (34) being disposed in the channel (31) and engaging at one end an inertia sensitive ball (40) located on a variable slope surface (17), and engaging a third valve (35) at the other end. The proportioning valve (20) includes a second piston (80) having a reduced diameter end (82) engaging a third piston (105) of enlarged diameter dis- posed in a portion of the channel (31), the channel (31) communicating by means of an opening (90) with the fluid- containing chamber (13). During initial brake applica- tion by the operator, the third valve (35) remains closed so that the third piston (105) does not move and prevents further movement of the second piston (80), thereby pre- venting higher braking pressure from being communicated to the wheel brake cylinder. Upon obtaining an initial level of deceleration, the inertia sensitive ball (40) moves along an initial low slope portion (39) of the sur- face (17) so that the third valve (35) opens and permits movement of the third piston (105) by the second piston (80) so that higher braking pressures are communicated to the wheel brake cylinder. The proportioning valve assem- bly (10) eliminates the communication of excessive pres- sure to a brake assembly during vehicle travel on a low coefficient of friction roadway surface.
531122
Bach Lloyd G.
Gaiser Robert F.
Myers Lawrence R.
Allied-Signal Inc.
Macrae & Co.
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