Fluid-pressure and analogous brake systems – Motorman's valves – Multiple motors
Patent
1987-04-02
1988-05-03
Reger, Duane A.
Fluid-pressure and analogous brake systems
Motorman's valves
Multiple motors
303 54, B60T 1520
Patent
active
047415797
ABSTRACT:
The distributor includes a body with first and second inlet connectors for connection to two pressure sources, and first and second outlet connectors for connection to two separate brake circuits. Communication between the inlet connectors and the outlet connectors is controlled by two valves formed coaxially in the body and provided with a common control device. This device comprises first and second pistons movable coaxially in the body to control the first and second valves. The first piston is movable by means of the operation of the brake pedal and has an extension which extends through an aperture in the second. The latter has an associated spring which biasses it towards the position in which it opens the second valve. First and second reaction members are movable on the extension of the first piston, the first of these cooperating with the second piston and the second being located between the first reaction member and an end retaining head of the extension. Between the reaction members is a spring which urges the first of these towards the first piston and the second against the retaining head. A stop member is provided in the body for stopping the second reaction member relative to the extension of the first piston when the latter is close to the position in which it causes the opening of the first valve, so that further movement of the first piston causes compression of the spring between the reaction members. This spring is therefore not compressed in the initial operating phase of the brake pedal and hence does not provide any reaction to the foot. This spring is compressed only when the opening of the valves is imminent and the consequent reaction transmitted to the foot of the driver is an advantageous indication of the imminence of the opening of the valves.
REFERENCES:
patent: 3152844 (1964-10-01), Bueler
Industrie Magneti Marelli S.p.A.
Reger Duane A.
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