B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/87
B60T 15/00 (2006.01) B60T 8/26 (2006.01) B60T 11/34 (2006.01)
Patent
CA 2000864
PRESSURE-BALANCED PROPORTIONING VALVE WITH VENT-CONTROLLED BYPASS ABSTRACT A proportioning valve (40) is disposed within a stepped bore (13) of a master cylinder (10). The propor- tioning valve (40) defines with the stepped bore (13) a primary pressure receiving chamber (26) and a secondary pressure receiving chamber (28). The proportioning valve (40) includes a two-part piston (58) which includes a pri- mary piston part (52) and a secondary piston part (54) coupled together by a lost motion coupling (53, 55). The piston parts (52, 54) are biased apart by a spring (78), and a sleeve (43) is disposed about the two-part piston (50). Seals (46, 47, 69) are disposed about the primary piston part (52), sleeve (43) and secondary piston part (54) to define an intermediate vented chamber (90), where- in a vent (19) communicates with a reservoir. Pressure failure within the primary re- ceiving chamber (26) causes the primary piston part (52) to be displaced and close off the vent (19) so that fluid pressure is trapped within the intermediate chamber (90) to prevent the secondary piston part (54) from effecting the metering of fluid flow through an outlet (21).
Crumb Donald Arthur
Gaiser Robert Frank
Steer John Evan
Alliedsignal Inc.
Macrae & Co.
LandOfFree
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