| CPC B60T 8/3675 (2013.01) [B21K 1/20 (2013.01); B60T 8/3605 (2013.01); B60T 13/683 (2013.01); B60T 15/18 (2013.01); F16K 11/22 (2013.01); F16K 11/24 (2013.01); F16K 31/1262 (2013.01); B60T 2270/10 (2013.01)] | 16 Claims |
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1. An ABS pressure control valve assembly for controlling the fluid pressure in a pressure-medium-operated brake system of a vehicle with brake-slip control, by which the brake pressure in pressure-medium-operated brake actuators is adaptively adjusted for a lockup tendency of individual wheels of the vehicle, comprising:
a) a housing which has at least two housing parts, namely a first housing part and a second housing part;
b) two diaphragm valves having diaphragms loaded by spring elements, namely an inlet diaphragm valve having an inlet diaphragm and an outlet diaphragm valve having an outlet diaphragm;
c) an electrical signal input port for the inputting of electrical control signals of an electronic control device;
d) solenoid valves, which are activated by the electronic control device, for subjecting the diaphragm valves to pilot control by a control pressure in each case, namely a holding solenoid valve, which subjects the inlet diaphragm valve to pilot control by a first pilot pressure, and an outlet solenoid valve, which subjects the outlet diaphragm valve to pilot control by a second pilot pressure;
e) a pressure relief port, which is connected to a negative pressure source;
f) a pressure output port for the connection of at least one pressure-medium-operated brake actuator;
g) a pressure input port for the connection of a device which generates a brake pressure; and
h) an intermediate plate which is arranged between the two housing parts;
wherein:
i) first and second spring elements are supported on the one hand on the intermediate plate and on the other hand on the diaphragms,
j) in a first closed position the inlet diaphragm is urged in a sealing manner against a first diaphragm valve seat by at least the first spring element, and in a second closed position the outlet diaphragm is urged in a sealing manner against a second diaphragm valve seat by at least the second spring element,
k) in a first lifted position the inlet diaphragm is lifted from the first diaphragm valve seat, whereby the pressure input port is connected to the pressure output port, and in a second lifted position the outlet diaphragm is lifted from the second diaphragm valve seat, whereby the pressure output port is connected to the pressure relief port,
l) an outer edge of the inlet diaphragm is clamped between the first housing part and the intermediate plate, and wherein
m) the first diaphragm valve seat is formed in the first housing part, wherein
n) an outer edge of the outlet diaphragm is clamped between the second housing part and the intermediate plate,
o) the second diaphragm valve seat is formed in the second housing part,
p) there is formed in the intermediate plate at least a portion of an inlet control chamber which is delimited by the inlet diaphragm and to which the holding solenoid valve applies the first pilot pressure,
q) there is formed in the intermediate plate at least a portion of an outlet control chamber which is delimited by the outlet diaphragm and to which the outlet solenoid valve applies the second pilot pressure, wherein
r) there is formed in the intermediate plate at least a portion of a first control channel which connects the holding solenoid valve to the inlet control chamber,
s) there is formed in the intermediate plate at least a portion of a second control channel which connects the outlet solenoid valve to the outlet control chamber, and
t) a first movement of the inlet diaphragm from the first closed position into the first lifted position and a second movement of the outlet diaphragm from the second closed position into the second lifted position are directed opposite to one another and in the direction towards the intermediate plate;
wherein a) the holding solenoid valve is formed by a first 3/2-way solenoid valve, wherein its first port is connected to the pressure input port, its second port is connected to the first control channel, and
wherein b) the outlet solenoid valve is formed by a second 3/2-way solenoid valve, wherein its first port is connected to the pressure input port, its second port is connected to the second control channel.
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