Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1980-08-14
1982-09-07
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
303 7, 303 13, B60T 818, B60T 826
Patent
active
043480624
ABSTRACT:
A fluid pressure braking system for an articlated vehicle having a towed unit and a towing unit includes a source of fluid pressure carried on the towing unit and a supply line (68) and a service line (70) which communicates the braking system on the towing unit with the braking system on the towed unit. A proportioning valve (36) controls communication to the relay valve (42) which communicates braking pressure to the rear wheel service brakes of the towing unit. The proportioning valve (36) is connected through a control port (82) to an inversion valve (76). The inversion valve (76) is responsive to fluid pressure in the supply line (68) to communicate a pressure signal to the control port (82) when the pressure level in the supply line (68) drops below a predetermined level. The proportioning valve (36) is responsive to the pressure signal on the control port (82) to proportion communication to the control port of the relay valve (42). Accordingly, when the pressure level in the supply line (68) drops below the predetermined level, which indicates that the towed unit has been disconnected from the towing unit, the proportioning valve (36) cuts down on the braking pressure communicated to the rear wheel brakes of the towing unit. On the other hand, when the pressure in the supply line (68) is above the predetermined level, thereby indicating that the towing unit and towed unit are connected, the proportioning valve (36) permits substantially uninhibited communication to the relay valve (42).
REFERENCES:
patent: 3190700 (1965-06-01), Fites
patent: 3492052 (1970-01-01), Klimek
patent: 3957315 (1976-05-01), Cummins et al.
patent: 4230373 (1980-10-01), Plantan
Antonis William N.
Butler Douglas C.
Decker Ken C.
The Bendix Corporation
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