Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1986-04-11
1987-07-14
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
60591, 188349, 303 24A, 303 24C, 303 24F, B60T 828
Patent
active
046798641
ABSTRACT:
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 disposed in a portion of the channel (31), the channel (31) communicating by an opening (90) with the fluid-containing chamber (13). During initial brake application 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 preventing 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 surface (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 assembly (10) eliminates the communication of excessive pressure to a brake assembly during vehicle travel on a low coefficient of friction roadway surface.
REFERENCES:
patent: 3147042 (1964-09-01), Stelzer
patent: 3476443 (1969-11-01), Bratten et al.
patent: 4196937 (1980-04-01), Falk
patent: 4205883 (1980-06-01), Gaiser
patent: 4331364 (1982-05-01), Koshimizu et al.
patent: 4412702 (1983-11-01), Bach et al.
patent: 4477123 (1984-10-01), Schnurer
patent: 4509800 (1985-04-01), Kubota
patent: 4595243 (1986-06-01), Gaiser
Bach Lloyd G.
Gaiser Robert F.
Myers Lawrence R.
Allied Corporation
Butler Douglas C.
Decker Ken C.
Palguta Larry J.
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