| 摘要 |
The distributor includes a body (2) with first and second inlet connectors (10, 11) for connection to two pressure sources, and first and second outlet connectors (12, 13) for connection to two separate brake circuits. Communication between the inlet connectors (10, 11) and the outlet connectors (12, 13; is controlled by two valves (15, 16; 19, 20) formed coaxially in the body (2) and provided with a common control device. This device comprises first and second pistons (5, 23) movable coaxially in the body to control the first and second valves. The first piston (5) is movable by means of the operation of the brake pedal and has an extension (26) which extends through an aperture (25) in the second (23). The latter has an associated spring (24) which biasses it towards the position in which it opens the second valve (19, 20). First and second reaction members (27, 28) are movable on the extension (26) of the first piston (5), the first of these cooperating with the second piston (23) and the second being located between the first reaction member (27) and an end retaining head (26a) of the extension (26). Between the reaction members is a spring (29) which urges the first of these towards the first piston (5) and the second against the retaining head (26a). A stop member (30) is provided in the body (2) for stopping the second reaction member (28) relativ to the extension (26) of the first piston (5) when the latter is close to the position in which it causes the opening of the first valve (15, 16), so that further movement of the first piston (5) causes compression of the spring (29) between the reaction members (27, 28). This spring (29) 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 (15, 16; 19, 20) 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. |
