Brake system in-line fast fill valve

Details Brake system in-line fast fill valve Brake system in-line fast fill valve

B - Operations, Transporting

60

T

188/159, 188/195

B60T 11/16 (2006.01) B60T 11/224 (2006.01)

Patent

CA 1319897

BRAKE SYSTEM IN-LINE FAST FILL VALVE ABSTRACT OF THE DISCLOSURE The brake system in-line fast fill valve (10) of the present invention comprises a valve housing (12) which may be threadably inserted within the body of a master cylinder so that an inlet (28) at one end of the fast fill valve (10) communicates with an outlet (39) from a pressure chamber (33) of the master cylinder (30). The valve housing (12) includes a stepped bore (22) having a differential area fast fill piston (40) receiving slidably therein a poppet piston (60). A first seal (50) is disposed about a reduced diameter portion (46) of the fast fill piston (40) and axially opposite a second seal (52) disposed at an enlarged diameter end (48) of the fast fill piston (40). The second seal (52) is received about a second radially enlarged end (62) of the poppet piston (60), the poppet piston (60) extending through the fast fill piston (40) and an end opening (44) within the fast fill piston (40), with a third seal (56) disposed about a first poppet end (66) and abutting a reduced diameter end (42) of the fast fill piston (40). A first spring (72) biases the poppet piston (60) into engagement with the fast fill piston (40), and a second spring (74) extends between a second radially enlarged end (68) of the poppet piston (60) and a radial wall (23) of said stepped bore (22). The enlarged ends (48, 68) of the pistons (40, 60) are disposed within a fast fill chamber (24) which communicates with an outlet (20) of the fast fill valve housing (12). The fast fill valve (10) effects a quick transmittal of fluid to a brake piston, and effects a slight delay in the transmission of higher pressure to the brake so that the fast fill valve (10~ functions as a hold-off valve.

597162

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