DE19510492C2 - Relay valve arrangement - Google Patents

Description

The invention relates to a relay valve device according to the preamble of Claim 1 and claim 12.

Such a relay valve device is known from DE 39 16 642 A1. through this known relay valve device is one of the level of a control pressure dependent pressure controllable.

This relay valve device is operated in an electrically controlled pressure medium arranged brake system of a vehicle, in which the pressure medium in the brake cylinder in case of trouble-free operation via a pressure modulator, in the event of malfunctions in the electrical part of the brake system, however, via the Relay valve set up. With trouble-free operation it is necessary to every braking process the connection between the control input of the relay valve interrupt the valve device and the control pressure source. For this purpose, in from the control pressure source to the control input of the relay valve device leading pressure medium line arranged a 3/2-way valve, which of the Pressure modulator controlled pressure is controlled. When the Brake cylinder with pressure medium coming from the pressure modulator becomes the control shut off the input of the relay valve device against the control pressure source and with connected to the atmosphere. The inlet and outlet valve of the relay valve device device is not operated, so that no pressure from the relay valve device is controlled.

If there is a defect in the electrical part of the brake system, this is due affects that from the pressure modulator no brake pressure and thus no tax pressure is controlled for the 3/2-way valve, the 3/2-way valve remains in  its starting position, in which it is the control input of the relay valve device shut off from the atmosphere and with the control pressure source (motor vehicle Brake valve) connects. The inlet and outlet valve of the relay valve device is then actuated by the relay piston and thus by the relay valve device the size of the control pressure dependent brake pressure, which the Brake cylinders is fed.

From DE 32 40 274 C2 a multi-circuit controllable pressure control valve is Direction for a pressure brake system known, which is a relay valve contains analog pilot valve and an electromagnetic valve. A first entrance to the Solenoid valve is connected to an output of the pilot valve and an second input of the solenoid valve is in with a control pressure source Connection. A pressure medium outlet of the solenoid valve is with a control Chamber of the relay valve connected. In the presence of an electrical control signals the control chamber of the relay valve with the pilot valve pressure and in the absence of an electrical control signal, the control chamber of the relay valve with the pressure of the control pressure source.

Furthermore, DE 30 31 105 A1 describes a load-dependent two-line Trailer brake system known, which has a brake force regulator and a Relaisven til as well as one from a trailer storage coupling to a trailer storage tank container leading supply line, one from a trailer brake coupling to Brake force regulator leading brake line and an emergency braking device with a Switching device contains. The switching device is between the supply line device and the brake line switched. In the event of failure of the motor vehicle The supply compressed air switches the switching device of the emergency braking device such that the leading from the emergency braking device to the reservoir Line with the leading from the emergency braking device to the brake force regulator Line is connected. The control chamber together with the brake force regulator menu-acting relay valve is therefore dependent on the position of the order switching device of the emergency braking device with the brake pressure or with the Supply pressure can be applied.  

DE 35 44 965 C2 is an electro-pneumatic multi-circuit brake system for Commercial vehicles are known which have at least one in a pressure medium brake circuit arranged, electrically controllable pressure control valve with at least one Pressure control input, control electronics for electrical control of the Pressure control valve and an emergency brake valve. If the tax fails electronics actuates the emergency brake valve, the pressure medium control input of the Pressure control valve connected to a compressed air reservoir.

The invention has for its object a relay valve device of the beginning mentioned type so that even in the presence of control pressure on Control input of the relay valve means actuation of the inlet and outlet valve of the relay valve device can be prevented without an external additional need to use directional valve.

This object is achieved with the inven in the claims 1 and 12 solutions solved. Further developments and advantageous refinements of the inventions are specified in the subclaims.

The invention specified in claim 1 offers in particular the advantage through the arrangement of a controllable auxiliary valve device in the relay valve direction venting and venting the control chamber and  thus the actuation of the intake and exhaust valve Relay valve device without the help of an external To control multi-way valve, regardless of whether a control at the control input of the relay valve device pressure pending or not.

The pressure reduction in the control chamber of the relay valve direction takes place according to an advantageous development the invention via a common vent connection for the pressure medium outlet chamber and the control chamber the relay valve device. For this purpose the Pressure medium outlet of the auxiliary valve device with the Pressure fluid outlet of the combined inlet and outlet valve of the relay valve device connected.

According to the invention specified in claim 12 serves to prevent actuation of the inlet and Exhaust valve of the relay valve device an additional cher Piston, the combined intake and exhaust valve the relay valve device when pressurized in To increase the distance between relays piston and valve member of the combined inlet and outlet takes valve. This prevents the relay piston moved by its control pressure with the Valve element of the combined intake and exhaust valve the relay valve device comes into contact and that Inlet valve opens. The arrangement of an auxiliary valve direction is not he with this relay valve device conducive.

According to an advantageous development of the patent award 1 specified invention is preferably as electromagnetically operated 2/2-way valve trained Dete valve device provided, by means of which  serve to actuate the auxiliary valve device the auxiliary control chamber after the auxiliary control piston a previous pressure control against one 2/2-way valve upstream valve device and thus can be shut off from the atmosphere, so that the auxiliary veins valve device from the auxiliary control piston in a switch position is held in which it is the tax chamber the relay valve device against the control pressure source cordoned off and connecting with the atmosphere. The print with tel exit chamber of the relay valve device is in this switching position of the auxiliary valve device on combined inlet and outlet valve of the relay valve blocked against the pressure medium inlet chamber and connected to the atmosphere, even if on Control input of the relay valve device control pressure pending.

Instead of an electromagnetically operated 2/2-way valve can advantageously also be a simple one Double check valve are provided, which with the pressure medium coming from a brake value transmitter and the coming from a pressure modulator into the auxiliary tax chamber controlled pressure medium is acted upon.

According to an advantageous further development of the Erfin the object of the relay piston with a shared trained control surface, the one Partial area with the pressure from the control pressure source and the other partial area (optional) with the atmosphere or the pressure of the auxiliary control chamber can be applied, can from the relay valve device pressures below different slope are controlled, the Slope from the ratio of the partial control area to the total area depends.

Based on the drawing, four versions are shown below tion examples of the invention explained in more detail.

Show it:

Fig. 1 a arranged in an electro-pneumatically operated brake system of a vehicle, relay-valve device with auxiliary valve means and auxiliary control chamber;

FIG. 2 shows a relay valve device according to FIG. 1, arranged in an electro-pneumatically actuable brake system of a vehicle, with a double check valve upstream of the auxiliary control chamber;

Fig. 3 is arranged in an electro-pneumatically actuated brake system of a vehicle relay valve device according to FIG. 1 with a 2/2-way solenoid valve and the auxiliary control chamber upstream

Fig. 4 is arranged in an electro-pneumatically actuated brake system of a vehicle relay valve device with an additional piston for changing the distance between the relay piston and the combined inlet and outlet valve of the relay valve device Re.

In Fig. 1, a fluid-actuated in an electrically controlled brake system pressure is shown a vehicle arranged relay valve means having a closed by a cover 1 housing (20). In the housing (20) includes a relay piston (22) is arranged movable in the direction of the longitudinal axis of the housing (20). The relay piston ( 22 ) separates a pressure medium outlet chamber ( 23 ) from a control chamber ( 45 , 7 ). A on the circumference of the relay piston ( 22 ) arranged sealing ring ( 21 ) seals the pressure medium outlet chamber ( 23 ) and the control chamber ( 45 , 7 ) against each other.

The pressure medium outlet chamber ( 23 ) is connected via a combined inlet and outlet valve ( 25 , 26 , 27 ) depending on the position of the relay piston ( 22 ) with a pressure medium inlet chamber ( 30 ) or with a pressure medium outlet leading to the atmosphere ( 39 ) bar or lockable against both.

The inlet valve ( 27 , 26 ) of the combined inlet and outlet valve ( 25 , 26 , 27 ) consists of an annular, housing-fixed valve seat ( 26 ) and a coaxial with this, provided with a sealing element annular valve member ( 27 ) with an inner and an outer tubular extension which on these to and from this is on the outer circumferential surface of a tubular guide (28) relative to the valve seat (26) can be moved away and is held by the force of a spring (31) on the valve seat (26). The tubular guide ( 28 ) consists of an annular body with an inner and an outer tubular extension, the inner and the outer tubular extension of the valve member ( 27 ) on the outer circumferential surface of the associated inner and outer tubular extension of the tubular guide ( 28 ) are sealed.

The relay piston ( 22 ) has a centrally arranged tubular extension ( 44 ) which extends in the direction of the valve member ( 27 ) and is designed at its free end as a valve seat ( 25 ). This valve seat ( 25 ) forms together with the valve member ( 27 ) the outlet valve ( 25 , 27 ) of the combined inlet and outlet valve ( 25 , 26 , 27 ).

At the tubular extension ( 44 ) a re relay piston ( 22 ) penetrating, stepped bore ( 43 ), which serves to receive a stepped pin-like part ( 24 ), which is part of a cup-shaped housing part ( 19 ). The peg-like part ( 24 ) is arranged centrally on the side of the bottom of the pot-shaped housing part ( 19 ) facing away from the interior of the pot-shaped housing part ( 19 ) and extends precisely into the bore ( 43 ) and the tubular extension ( 44 ) of the relay piston ( 22 ) into it. Between the outer surface of the pin-like part ( 24 ) and the inner wall of the tubular extension ( 44 ), a sealing ring ( 42 ) is arranged, which the control chamber ( 45 , 7 ) and the pressure medium outlet chamber ( 23 ) and the control chamber ( 45 , 7 ) and the Druckmit telauslaß ( 39 ) seals against each other.

In the cup-shaped housing part ( 19 ), a piston serving as an auxiliary control piston ( 16 ) is arranged to be movable in the direction of the longitudinal axis of the cup-shaped housing part ( 19 ). The auxiliary control piston ( 16 ) is designed as a membrane piston and separates an auxiliary control chamber ( 13 ) from a ventilation space ( 48 ). The ventilation space ( 48 ) is delimited by the bottom of the pot-shaped housing part ( 19 ) and by the side of the auxiliary control piston ( 16 ) facing it. The auxiliary control chamber ( 13 ) is limited by a cup-shaped housing part ( 19 ) closing, designed as a cover ( 12 ) wall and the cover ( 12 ) facing side of the auxiliary control piston ( 16 ). The peg-like part ( 24 ) has a bore ( 40 ) running in the direction of its longitudinal axis, via which the ventilation space ( 48 ) is permanently connected to the pressure medium outlet ( 39 ) of the relay valve device.

The cover ( 12 ) closing the auxiliary control chamber ( 13 ) has a centrally arranged through opening ( 49 ) through which a tappet ( 15 ) is guided. The plunger ( 15 ) is centrally attached to the auxiliary control piston ( 16 ) with its end located in the auxiliary control chamber ( 13 ).

Coaxial with the through-opening ( 49 ) arranged in the cover ( 12 ) closing the auxiliary control chamber ( 13 ), a graduated recess ( 3 , 51 ) is arranged in the cover ( 1 ) closing the housing ( 20 ) of the relay valve device. The stepped recess ( 3 , 51 ) has the function of a pressure medium line, which connects a control input ( 2 ) to the control chamber ( 7 , 45 ). The stepped recess ( 3 , 51 ) serving as a pressure medium line can of course also be arranged in the housing ( 20 ). Since the cover ( 1 ) is part of the housing ( 20 ), the pressure medium line is always considered to be arranged in the housing ( 20 ). In the larger cross-sectional area ( 51 ) of the recess ( 3 , 51 ) a plate ( 53 ) is mounted. The plate ( 53 ) is dimensioned in its strength so that after the connection between the housing ( 20 ) and the cover ( 1 ) of the relay valve device between the cover ( 1 ) of the housing ( 20 ) of the relay valve device and the cover ( 12 ) is clamped for the cup-shaped housing part ( 19 ). Between the plate ( 53 ) and the cover ( 1 ) of the relay valve housing Re, a sealing ring ( 52 ) is arranged, which seals the control chamber ( 45 , 7 ) and the recess ( 3 , 51 ) against each other. At the recess ( 3 , 51 ) is a transverse to the longitudinal axis of the housing ( 20 ) ver running, arranged in the cover ( 1 ) channel, which is connected to the control input ( 2 ) arranged on the cover ( 1 ).

The plate ( 53 ) has a through opening ( 9 ), which is coaxial with the through opening ( 49 ) in the cover ( 12 ) of the cup-shaped housing part ( 19 ) and coaxial with the recess ( 3 , 51 ) in the cover ( 1 ) of the housing ( 20 ) the relay valve device is arranged.

The plunger ( 15 ) attached to the auxiliary control piston ( 16 ) is guided through the through opening ( 9 ) and its free end extends into the stepped recess ( 3 , 51 ) of the cover ( 1 ) of the housing ( 20 ) of the relay valve device , The plunger ( 15 ) has a through hole ( 17 ) running in the direction of its longitudinal axis.

In the area ( 3 ) of the stepped recess ( 3 , 51 ) in the cover ( 1 ) with the smaller cross section, there is a plate-like body serving as a valve member ( 5 ) in the direction of the longitudinal axis of the recess ( 3 , 51 ) and the plunger ( 15 ). arranged movably. The valve member ( 5 ) facing free end of the plunger ( 15 ) is designed as a lassventilsitz ( 6 ). The plunger ( 15 ) provided with the through bore ( 17 ) and the outlet valve seat ( 6 ) thus forms with the valve member ( 5 ) an outlet valve ( 5 , 6 ). The diameter of the through opening ( 9 ) in the plate ( 53 ) and the cross section of the plunger ( 15 ) are chosen so that an annular gap remains between the outer lateral surface of the plunger ( 15 ) and the wall delimiting the through opening ( 9 ). The through opening ( 9 ) is delimited by a circumferential projection which first extends to the valve member ( 5 ) and which serves as an inlet valve seat ( 8 ) for the valve member ( 5 ) and forms an inlet valve ( 5 , 8 ) with it. On the side of the lid (12) facing the plate (53) and / or on the cover (12) facing side of the plate (53) are in or on the cover (12) and / or the plate ( 53 ) depressions or elevations are arranged, which form channels via which the control chamber ( 45 , 7 ) is connected to the through opening ( 9 ) in the plate ( 53 ).

The auxiliary control piston (16) will strike in the direction of the auxiliary control chamber (13) to beauf a is classified in abge peg-like part (24) supporting spring (18) and against in the auxiliary control chamber (13) hineinerstreckende projections (14) of the auxiliary control chamber ( 13 ) closing lid ( 12 ) pressed. A at the bottom of the stepped recess ( 3 , 51 ) of the cover ( 1 ) for the housing ( 20 ) of the Relaisventileinrich device supporting spring ( 4 ) acts on the valve member ( 5 ) in the direction of the outlet valve seat ( 6 ) and the inlet valve seat ( 8 ) and holds the valve member ( 5 ) on the exhaust valve seat ( 6 ) as long as the auxiliary control piston ( 16 ) is held by the spring ( 18 ) in its starting position on the projections ( 14 ) of the cover ( 12 ).

The inlet valve ( 5 , 8 ) and the outlet valve ( 5 , 6 ) bil together a combined inlet and outlet valve, which serves as an auxiliary valve device for the relay valve device ( 5 , 6 , 8 ). About the Hilfsventileinrich device ( 5 , 6 , 8 ), the control chamber ( 45 , 7 ) of the relay valve device depending on the position of the auxiliary control piston ( 16 ) with a control pressure source or with the atmosphere can be connected or shut off against both. The control chamber ( 45 , 7 ) is composed of the chamber ( 45 ) delimited by the relay piston ( 22 ) and an annular chamber ( 7 ), which from the facing sides of the cover ( 1 ) of the housing ( 20 ) of the relay valve device and the side of the auxiliary control chamber (13) closing the lid (12) is limited, which is remote from the auxiliary control chamber (13), said two chambers (45) and (7) connected to each other via a passage (10) extending from the Outer wall of the pot-shaped housing part ( 19 ) and the inner wall of the housing ( 20 ) of the relay valve device is limited.

Between the cover ( 12 ) of the cup-shaped housing part ( 19 ) and the cup-shaped housing part ( 19 ), a sealing ring ( 11 ) is arranged, which seals the control chamber ( 45 , 7 ) and the auxiliary control chamber ( 13 ) against each other. For the same purpose, the plunger ( 15 ) carries on its order a sealing ring ( 50 ) which sealingly abuts the wall defining the through opening ( 49 ) in the cover ( 12 ) of the cup-shaped housing part ( 19 ).

As already mentioned, the combined inlet and outlet valve ( 25 , 26 , 27 ) of the relay valve device, the relay piston ( 22 ), the auxiliary control piston ( 16 ) and the auxiliary valve device ( 5 , 6 , 8 ) are arranged coaxially to one another, the one with the exhaust valve (5, 6) of the auxiliary valve means (5, 6, 8) venting associated space (48) via the bore (40) in the peg-like extension (24) of the pot-shaped housing part (19) directly ver with the pressure medium outlet (39) of the relay valve means connected is. It is thus for the outlet valve ( 25 , 27 ) of the combined inlet and outlet valve ( 25 , 26 , 27 ) of the relay valve device and for the outlet valve ( 5 , 6 ) of the auxiliary valve device ( 5 , 6 , 8 ) only a common vent outlet on the housing ( 20 ) of the relay valve device required.

The pressure medium input chamber ( 30 ) of the Relaisventilein direction is connected via an associated pressure medium input ( 41 ) and a pressure medium line ( 54 ) and an adjoining pressure medium line ( 36 ) to a compressed air supply container ( 32 ) serving as a pressure medium source. The pressure medium outlet chamber ( 23 ) is connected via an associated pressure medium outlet ( 29 ) and a pressure medium line ( 122 ) to a first input of a shuttle valve ( 121 ), the output of which is connected via a pressure medium line ( 120 ) to brake cylinders ( 57 ) of the brake system of the vehicle is. In the drawing, for the sake of simplicity, only one brake cylinder is shown. The control input ( 2 ) of the relay valve device is connected via a pressure medium line ( 119 ) to the pressure medium output of a valve device designed as an electro-pneumatic brake value transmitter ( 118 ), which serves as a control pressure source for the relay valve device. The pressure medium inlet of the brake value transmitter ( 118 ) is connected to the compressed air reservoir ( 32 ) via a pressure medium line ( 117 ) which is connected to the pressure medium line ( 36 ). The auxiliary control chamber ( 13 ) is via a housing channel ( 47 ) serving as a pressure medium line, a control connection ( 46 ), a pressure medium line ( 38 ) and an electrically controllable valve device ( 37 ) designed as a pressure modulator and the pressure medium line ( 36 ) with the compressed air reservoir ( 32 ) connectable.

The pressure modulator ( 37 ) has an electrical control connection ( 35 ) which is connected via an electrical control line ( 34 ) to an output of an electrical control device ( 33 ). An input of the electrical control device ( 33 ) is connected via an electrical control line ( 116 ) to an electrical control output of the brake value transmitter ( 118 ).

The brake value transmitter ( 118 ) consists of a valve device designed as a Motorwa gene brake valve and an electrical device which, for. B. contains a variable resistor (potentiometer). If the tread plate of the brake signal transmitter (118) for the purpose of initiating a braking operation is actuated, on the one hand be controlled by the brake signal transmitter (118) a of the position of the pedal plate from-dependent control pressure to the control input (2) of the relay valve arrangement is fed, and at the other hand a of the Pedal position dependent electrical control signal generated, which is the electrical control's rule ( 33 ) supplied. The pressure modulator ( 37 ) contains an electrically controllable Ven valve device, which controls a pressure in the pressure medium line ( 38 ) dependent on the electrical control signal of the electrical control device ( 33 ).

Below is the function of the relay described valve device in the brake system explained in more detail.

It is believed that the relay valve means in Rear axle brake circuit of an electro-pneumatically operated Brake system of a vehicle is arranged.

When the brake is not applied, the relay valve device is in the position shown. The inlet valve ( 26 , 27 ) of the combined inlet and outlet valve ( 25 , 26 , 27 ) is in its closed position and the outlet valve ( 25 , 27 ) of the combined inlet and outlet valve ( 25 , 26 , 27 ) in its open position. The inlet valve ( 5 , 8 ) of the auxiliary valve device ( 5 , 6 , 8 ) is open, and the outlet valve ( 6 , 5 ) of the auxiliary valve device ( 5 , 6 , 8 ) is closed. At the input of the pressure modulator ( 37 ) and in the pressure medium input chamber ( 30 ) of the Relaisventilein direction there is supply pressure. The brake cylinder ( 57 ), of which only one is shown in the drawing, as well as the pressure medium outlet chamber ( 23 ), the control chamber ( 7 , 45 ) and the auxiliary control chamber ( 13 ) of the relay valve device Re are depressurized.

Is actuated by the driver of the vehicle, the braking value generator (118) passes from the electric control output of the brake signal transmitter (118) an electrical control signal to the electrical control device (33). The electrical control device ( 33 ) then gives an electrical control signal to the pressure modulator ( 37 ). The pressure modulator ( 37 ) then controls a pressure dependent on the control signal of the electrical control device ( 33 ). The compressed air coming from the pressure modulator ( 37 ) passes through the second inlet of the shuttle valve ( 121 ) to its outlet and from there into the brake cylinders ( 57 ). The first input of the shuttle valve ( 121 ) is blocked because the shuttle valve ( 121 ) always passes the higher pressure of the pressures at its inputs to its outlet. Via the pressure medium line ( 38 ) at the same time the compressed air controlled by the pressure modulator ( 37 ) reaches the auxiliary control chamber ( 13 ) of the relay valve device. The pressure building up in the auxiliary control chamber ( 13 ) causes the auxiliary control piston ( 16 ) to move against the force of the spring ( 18 ) towards the bottom of the cup-shaped housing part ( 19 ). The plunger ( 15 ) connected to the auxiliary control piston ( 16 ) is taken along by the auxiliary control piston ( 16 ). The valve member (5) of the auxiliary valve means (5, 6, 8) is based on the inlet valve seat (8). The inlet valve (5, 8) of the auxiliary valve means (5, 6, 8) is then in its closed position and thus blocks the connection between the control input (2) and the control chamber (7, 45) from. The controlled by the brake value transmitter ( 118 ), serving as control pressure compressed air can not get into the control chamber ( 7 , 45 ) of the relay valve device.

Upon further downward movement of the auxiliary control piston (16) and thus also of the plunger (15) of the plunger (15) is pulled away from the valve member (5). The outlet valve ( 6 , 5 ) of the auxiliary valve device ( 5 , 6 , 8 ) is then in the open position. Telauslaß via the now open from laßventil (6, 5), the vent space (48) of the pot-shaped housing part in the peg-like extension (24) (19) bore located (40) and the pressure with (39) of the relay valve arrangement is the STEU erkammer ( 7 , 45 ) then associated with the atmosphere. The inlet valve ( 26 , 27 ) of the relay valve means remains closed and the outlet valve ( 25 , 27 ) of the relay valve means remains open. The first input and the output of the shuttle valve ( 121 ) are blocked against each other so that the brake cylinders ( 57 ) cannot be inadvertently connected to the atmosphere via the relay valve device. An actuation of the inlet and outlet valve ( 25 , 26 , 27 ) of the relay valve device is thus prevented even in the presence of control pressure medium at the control input of the relay valve device and the brake cylinders ( 57 ) are only acted upon by the pressure modulated by the pressure modulator ( 37 ).

A prerequisite for an optimal sequence for the operations described without uncontrollable intermediate or transition states is that the control path from the electrical control output of the brake value transmitter ( 18 ) to the auxiliary control chamber ( 13 ) is run faster than that of the pneumatic control output of the brake value transmitter ( 118 ) to to the auxiliary valve device ( 5 , 6 , 8 ).

If the braking process is to be ended, the pedal of the brake value transmitter ( 118 ) is returned to its starting position. The electrical control signal on the electrical control device ( 33 ) and on the pressure modulator ( 37 ) drops. The pressure modulator ( 37 ) switches over in such a way that the connection between the pressure medium line ( 38 ) and the pressure medium line ( 36 ) leading to the compressed air reservoir ( 32 ) is interrupted and the pressure medium line ( 38 ) is connected to the atmosphere. The auxiliary control chamber ( 13 ) is vented via the housing channel ( 47 ), the control connection ( 46 ), the pressure medium line ( 38 ) and the pressure modulator ( 37 ). The auxiliary control piston ( 16 ) is then displaced towards the auxiliary control chamber ( 13 ) by the force of the spring ( 18 ). The outlet valve seat ( 6 ) provided on the tappet ( 15 ) comes to rest on the valve member ( 5 ). The outlet valve ( 6 , 5 ) of the auxiliary valve device ( 5 , 6 , 8 ) comes into the closed position. During the further movement of the auxiliary control piston ( 16 ) in the direction of the auxiliary control chamber ( 13 ), the valve member ( 5 ) is lifted off the inlet valve seat ( 8 ) by means of the tappet ( 15 ). The inlet valve (5, 8) of the auxiliary valve means (5, 6, 8) arrives in the open position. The control input ( 2 ) and the control chamber ( 7 , 45 ) of the relay valve device are then connected to one another again. Since the brake value transmitter ( 118 ) has been brought into its starting position before this process begins, the pressure medium line ( 119 ) leading from the brake value transmitter ( 118 ) to the control input ( 2 ) of the relay valve device is also against the compressed air reservoir ( 32 ) by means of the brake value transmitter ( 118 ) ) has been cordoned off and connected to the atmosphere. Thus, the control chamber ( 45 , 7 ) of the relay valve device is also connected to the atmosphere.

Occurrences during a braking operation z. B. in the electrical control device of the electro-pneuma table brake system, so that the electrical cal signal at the pressure modulator ( 37 ) drops, the pressure modulator ( 37 ) switches over in such a way that the connection between the compressed air reservoir ( 32 ) and the auxiliary control chamber ( 13 ) and the second input of the shuttle valve ( 121 ) are blocked and the auxiliary control chamber ( 13 ) and the second input of the shuttle valve ( 121 ) are connected to the atmosphere. The auxiliary control chamber ( 13 ) is vented to the atmosphere via the pressure modulator ( 37 ). The auxiliary control piston ( 16 ) is moved by the force of the spring ( 18 ) in the direction of the auxiliary control chamber ( 13 ), whereby the outlet valve ( 6 , 5 ) of the auxiliary valve device ( 5 , 6 , 8 ) in the closed position and the inlet valve ( 5 , 8 ) of the auxiliary valve device ( 5 , 6 , 8 ) in the open position. The actuated by the brake value transmitter ( 118 ) designed as a motor vehicle brake valve, serving as control pressure medium for the relay valve device and at the control input ( 2 ) of the relay valve device, then passes through the open inlet valve ( 5 , 8 ) of the auxiliary valve device ( 5 , 6 , 8 ) in the control chamber ( 7 , 45 ) of the relay valve device. The pressure building up in the control chamber ( 7 , 45 ) ver pushes the relay piston ( 22 ) towards the combined inlet and outlet valve ( 25 , 26 , 27 ), brings the outlet valve (25, 27 into the closed position and the inlet valve ( 26 , 27 ) into the open position Compressed air flows from the pressure medium inlet chamber ( 30 ) via the then opened inlet valve ( 26 , 27 ) of the combined inlet and outlet valve ( 25 , 26 , 27 ) into and from the pressure medium outlet chamber ( 23 ) continue via the pressure medium outlet ( 29 ) and the pressure medium line ( 122 ) connected to it to the first input of the shuttle valve ( 121 ) .Because of the now higher pressure at the first input of the shuttle valve ( 121 ), this switches over in such a way that its output is connected to its first inlet and blocked against its second inlet. From the outlet of the shuttle valve ( 121 ), the compressed air then reaches the brake cylinders ( 57 ) of the vehicle Control pressure in the control chamber ( 7 , 45 ) of the relay valve device dependent pressure builds up in the brake cylinders ( 57 ).

If the braking process is to be ended, the control chamber ( 7 , 45 ) is vented via the brake value transmitter ( 118 ). The relay piston ( 22 ) returns to its starting position due to the pressure difference between the pressure in the control chamber ( 7 , 45 ) and in the pressure medium outlet chamber ( 23 ). The inlet valve ( 26 , 27 ) reaches the closed position and the outlet valve ( 25 , 27 ) reaches the open position. The pressure medium outlet chamber ( 23 ) and thus also the brake cylinder ( 57 ) connected to it are vented via the pressure medium outlet ( 39 ) of the relay valve device.

If there is an electrical control signal on the pressure modulator ( 37 ) and, due to a fault on the pressure modulator ( 37 ), this pressure is not controlled, the auxiliary control chamber ( 13 ) is also, as described above, connected to the atmosphere and one dependent on the pressure in the control chamber ( 7 , 45 ) of the Relaisventilein direction dependent pressure in the brake cylinder ( 57 ).

Fig. 2 shows a arranged in an electro-pneumatically actuated brake system of a vehicle Relaisven valve device, which has the same structure as the relay valve device shown in Fig. 1, but is supplemented by a double check valve ( 65 ) trained additional valve device, by means of wel The connection between the auxiliary control chamber and the pressure modulator ( 37 ) connected upstream of the relay valve device can be blocked.

For the sake of clarity, those components and circuit parts which correspond to the components and circuit parts shown in FIG. 1 are provided with the same reference numbers in FIG. 2. Since the relay valve device shown in FIG. 2 has the same structure and also has the same function as the relay valve device shown in FIG. 1, the following description will only refer to the arrangement and design of the double check valve additionally integrated in the relay valve device ( 65 ) received.

In the housing ( 20 ) of the relay valve device, a recess ( 60 ) extending in the direction of the longitudinal axis of the housing ( 20 ) is arranged in the area between the cup-shaped housing part ( 19 ) and the control connection ( 46 ). A carrier ( 61 ) is mounted in the recess ( 60 ) and has a circumferential collar ( 58 ). On the control connection ( 46 ) facing the side of the federal government ( 58 ) on the carrier ( 61 ) a first groove ring with a sealing lip ( 56 ) is arranged, which rests under prestress on the recess ( 60 ) delimiting wall ( 66 ). Likewise, on the side of the collar ( 58 ) facing away from this side of the collar ( 58 ), a second grooved ring with a sealing lip ( 59 ) is arranged on the carrier ( 61 ), which under tension on the wall ( 66 ) delimiting the recess ( 60 ) ) is present. Instead of a grooving, a different type of sealing ring with a sealing lip can of course also be used.

In the recess ( 60 ) delimiting wall ( 66 ) in the area between the two sealing lips ( 56 ) and ( 59 ) egg ne groove-like recess ( 64 ) is provided, the verbun via a housing channel ( 47 ) with the auxiliary control chamber ( 13 ) is. The first sealing lip ( 56 ) is formed and arranged so that it forms with the recess ( 60 ) delimiting wall ( 66 ) in the direction of the auxiliary control chamber ( 13 ) to bring into the open position first check valve ( 56 , 66 ) and the second sealing lip ( 59 ) is arranged and designed such that it together with the wall ( 66 ) delimiting the recess ( 60 ) in the direction from the auxiliary control chamber ( 13 ) to the control input ( 2 ) of the relay valve device into the open position bringable second check valve ( 59 , 66 ) forms. A space ( 55 ) delimited by the carrier ( 61 ) and the first sealing lip ( 56 ) serves as an entry chamber for the first check valve ( 56 , 66 ), the groove-like recess ( 64 ) in the wall ( 66 ) serves as an exit chamber for the first check valve ( 56 , 66 ) and one of the carrier ( 61 ) and the second sealing lip ( 59 ) limited space ( 62 ) serves as an outlet chamber for the second check valve ( 59 , 66 ). The room ( 62 ) is connected via a housing channel ( 63 ) to the control input ( 2 ) of the relay valve device. The space ( 55 ) is connected to the control connection ( 46 ) of the relay valve device. The first check valve ( 56 , 66 ) and the second check valve ( 59 , 66 ) together form a double check valve ( 65 ).

The relay valve device shown in Fig. 2 works essentially the same as the relay valve device according to Fig. 1. When actuating the tilter designed as a motor vehicle Bremsven brake sensor ( 118 ) an electrical control signal from this is given to the electrical control device ( 33 ). This in turn generates an electrical control signal which reaches the pressure modulator ( 37 ) via the electrical control line ( 34 ). The compressed air coming from the pressure modulator ( 37 ) passes through the second inlet of the shuttle valve ( 121 ) to its outlet and from there into the brake cylinders ( 57 ). The first input of the shuttle valve ( 121 ) is blocked. Via the pressure medium line ( 38 ) and the control connection ( 46 ), the compressed air from the pressure modulator ( 37 ) reaches the space ( 55 ) at the same time. The compressed air flows past the sealing lip ( 56 ) of the first check valve ( 56 , 66 ) through the housing channel ( 47 ) into the auxiliary control chamber ( 13 ). Simultaneously with these processes, compressed air from the brake value transmitter ( 118 ) enters the room ( 62 ) via the control input ( 2 ) of the relay valve device and the housing channel ( 63 ). Since the pressure modulator ( 37 ) not only the electrical signals coming from the brake value transmitter ( 118 ) but also from other devices of the brake system also processes electrical signals such. B. axle load signals for axle load-dependent brake pressure control, is the pressure modulator ( 37 ) driven pressure, which is also via the space ( 55 ), the first check valve ( 56 , 66 ), the recess ( 64 ) and the housing channel ( 47 ) in the Auxiliary control chamber ( 13 ) arrives, generally lower than the brake value transmitter ( 118 ) and via the control input ( 2 ) of the relay valve device and the housing channel ( 63 ) into the space ( 62 ). The half is the second check valve ( 59 , 66 ) in its closed position, so that the pressure in the auxiliary control chamber ( 13 ) is held, and as long as the pressure controlled by the brake value transmitter ( 118 ) is not reduced or reduced ver. The pressure in the auxiliary control chamber ( 13 ) builds up a movement of the auxiliary control piston ( 16 ) in the direction of the ventilation space ( 48 ), whereby the inlet valve ( 5 , 8 ) of the auxiliary valve device ( 5 , 6 , 8 ) in the closed position and the outlet valve ( 6 , 5 ) of the auxiliary valve device ( 5 , 6 , 8 ) reaches the open position. The control chamber ( 7 , 45 ) of the relay valve device is then blocked against the control input ( 2 ) and via the outlet valve ( 5 , 6 ) of the auxiliary valve device ( 5 , 6 , 8 ) and the bore ( 40 ) in the peg-like extension ( 24 ) of the potfför migen housing part ( 19 ) and the pressure medium outlet ( 39 ) of the relay valve means connected to the atmosphere. The function of the relay valve device is then canceled and the brake cylinders ( 57 ) of the vehicle are only acted upon by the compressed air driven by the pressure modulator ( 37 ).

If the braking process is to be ended, the pedal of the brake value transmitter ( 118 ) is returned to its starting position. The electrical control signal on the electrical control device ( 33 ) and on the pressure modulator ( 37 ) drops. The pressure modulator ( 37 ) switches over in such a way that the connection between the pressure medium line ( 38 ) and the pressure medium line ( 36 ) leading to the compressed air reservoir is interrupted and the pressure medium line ( 38 ) and via this the space ( 55 ) with the At is connected to the atmosphere. At the same time, the space ( 62 ) is connected to the atmosphere via the housing channel ( 63 ), the control input ( 2 ), the pressure medium line ( 119 ) and the brake value transmitter ( 118 ). The compressed air in the auxiliary control chamber ( 13 ) then flows past the sealing lip ( 59 ) of the second check valve ( 59 , 66 ) and passes through the space ( 62 ), the housing channel ( 63 ), the control input ( 2 ), the pressure medium line ( 119 ) and the brake value transmitter ( 118 ) also to the atmosphere. Due to the pressure reduction in the auxiliary control chamber ( 13 ), the force exerted by the spring ( 18 ) in the opposite direction on the auxiliary control piston ( 16 ) then predominates. The auxiliary control piston ( 16 ) is then moved in the direction of the auxiliary control chamber ( 13 ) by the spring ( 18 ). The outlet valve seat ( 6 ) provided on the tappet ( 15 ) comes to rest on the valve member ( 5 ). The outlet valve ( 6 , 5 ) of the auxiliary valve device ( 5 , 6 , 8 ) comes into the closed position. During the further movement of the auxiliary control piston ( 16 ) in the direction of the auxiliary control chamber ( 13 ), the valve member ( 5 ) is lifted off from the inlet valve seat ( 8 ) by means of the tappet ( 15 ). The A laßventil (5, 8) of the auxiliary valve means (5, 6, 8) arrives in the open position. The control input ( 2 ) and the control chamber ( 7 , 45 ) of the relay valve device are then connected to one another again. For this reason, the control chamber ( 7 , 45 ) of the Relaisven valve device with the atmosphere.

If a fault occurs in the electrical part of the electro-pneumatically actuated brake system, which leads to the pressure modulator ( 37 ) not receiving an electrical control signal when the brake value transmitter ( 118 ) is actuated, or that despite the presence of an electrical control signal on the pressure modulator ( 37 ) from this no pressure is controlled, the control connection ( 46 ) and thus the auxiliary control chamber ( 13 ) of the Relaisven valve device remain depressurized and the brake cylinder ( 57 ) th from the pressure modulator ( 37 ) receive no pressure medium. The inlet valve (5, 8) of the auxiliary valve means (5, 8, 6) remains in its open position and the outlet valve (5, 6) of the auxiliary valve means (5, 8, 6) remains in its closed position. The compressed air controlled by the brake value transmitter ( 118 ) passes through the control input ( 2 ) of the relay valve device through the open inlet valve ( 5 , 8 ) into the control chamber ( 45 , 7 ) of the relay valve device and via the channel ( 63 ) into the room ( 62 ) of the double check valve ( 65 ). The second check valve ( 59 , 66 ) of the double check valve ( 65 ) shuts off the channel ( 63 ) and the auxiliary control chamber ( 13 ) against each other. The pressurized by the pressure in the control chamber ( 45 , 7 ) relay piston ( 22 ) brings the outlet valve ( 25 , 27 ) of the relay valve device into the closed position and the inlet valve ( 26 , 27 ) in the open position. From the relay valve device is now a pressure dependent on the control pressure of the brake value transmitter ( 118 ). The compressed air coming from the pressure medium outlet ( 29 ) then passes through the first input and the outlet of the shuttle valve ( 121 ) into the brake cylinder ( 57 ). The second inlet of the shuttle valve ( 121 ) is shut off against the outlet of the shuttle valve ( 121 ).

If the braking process is to be ended, the control chamber ( 45 , 7 ) of the relay valve device is vented via the inlet valve ( 5 , 8 ) of the auxiliary valve device ( 5 , 8 , 6 ) and the brake value transmitter ( 118 ). The pressure in the room ( 62 ) of the double check valve ( 65 ) also decreases via the brake value transmitter ( 118 ). The relay piston ( 22 ) comes back to its starting position due to the difference between the pressures in the control chamber ( 7 , 45 ) and in the pressure medium output chamber ( 23 ). The brake cylinder ( 57 ) are then vented via the shuttle valve ( 121 ) and the outlet valve ( 25 , 26 ) of the relay valve device.

The relay valve device described is provided for an electro-pneumatically actuated brake system equipped with an anti-lock control system. Since the first check valve ( 56 , 66 ) of the double check valve ( 65 ) opens only in the direction of the auxiliary control chamber ( 13 ), but blocks in the direction from the auxiliary control chamber ( 13 ) to the control connection ( 46 ) and the pressure at the control input ( 2 ) the relay valve device holds the second check valve ( 59 , 66 ) of the double check valve ( 65 ) in the closed position, as long as pressure is present at the control input ( 2 ), the pressure in the auxiliary control chamber ( 13 ) when the brake value transmitter is activated, even during an ABS control process held. The pressure drop at the control terminal (46) of the relay valve means, caused by a bleeding process, the brake cylinder (57) via the pressure modulator (37), causes therefore no To turn the auxiliary valve means (5, 6, 8) in the sense of closing the exhaust valve (5, 6 ) of the auxiliary valve means (5, 6, 8) and the opening of the intake valve (5, 8) of the auxiliary valve means (5, 6, 8), so that no pressure into the control chamber (7, 45) of the relay valve arrangement can be made.

Shutting off the auxiliary control chamber ( 13 ) against the control connection ( 46 ) is required in the ABS rule to prevent the auxiliary control chamber ( 13 ) from being vented when the brake cylinder ( 57 ) is vented via the pressure modulator ( 37 ) and is therefore caused by this the auxiliary valve means (5, 6, 8), switches in such a way that the outlet valve (5, 6) of the auxiliary valve means (5, 6, 8) in the closed position and the inlet valve (5, 8) of the auxiliary valve means (5, 6, 8 ) ge in the open position, whereby the control input ( 2 ) with the control chamber ( 7 , 45 ) would be connected. The result would be that the brake cylinders ( 57 ) would be acted upon by a pressure from the control pressure in the control chamber ( 7 , 45 ) of the relay valve device. After completing an ABS control process, the space ( 55 ) of the double check valve ( 65 ) is again acted upon by the pressure modulator ( 37 ) which is then activated pressure.

In Fig. 3 is arranged in an electro-pneumatically actuated brake system of a vehicle relay valve device is shown, which has essentially the same structure and also has the same function as the relay valve device shown in Fig. 1. The relay valve device shown in Fig. 3, however, additionally has an electromagnetically operable 2/2-way valve ( 70 ), by means of which the auxiliary control chamber ( 13 ) can be shut off against the control connection ( 46 ) for the auxiliary control chamber ( 13 ). For the sake of clarity, those components and circuit parts which correspond to the components and circuit parts shown in FIG. 1 are provided with the same reference numerals in FIG. 3.

In a recess ( 69 ) of the housing ( 20 ) of the relay valve device is designed as an electromagnetically operable 2/2-way valve ( 70 ) formed further valve device. The 2/2-way valve ( 70 ) has a pressure medium input, which is also connected to the output of the electrically controllable pressure modulator ( 37 ) via the control connection ( 46 ) of the relay valve device and the pressure medium line ( 38 ). Furthermore, the 2/2-way valve ( 70 ) has an outlet which is connected to the auxiliary control chamber ( 13 ) via the housing channel ( 47 ). An electrical control line ( 67 ) is an electrical control connection ( 68 ) of the 2/2-way valve ( 70 ) with a second output of the electrical control device ( 33 ).

If the driver of the vehicle actuates the brake value transmitter ( 118 ), the relay valve device shown in FIG. 3 operates in exactly the same way as the relay valve device shown in FIG. 1, the 2/2-way valve ( 70 ) being deenergized and thus open for the connection between the auxiliary control chamber ( 13 ) and the pressure modulator ( 37 ).

If the vehicle is equipped with an anti-lock control system, an electrical control signal is usually sent from the electrical control device ( 33 ) via the electrical control line ( 67 ) to the electrical control connection ( 68 ) of the electromagnetically actuated 2/2-way valve ( 70 ). given. The 2/2-way valve ( 70 ) switches over in such a way that the connection between the auxiliary control chamber ( 13 ) and the control connection ( 46 ) is interrupted. The pressure in the auxiliary control chamber ( 13 ) is maintained. This shutting off the Hilfssteu erkammer (13) to the control terminal (46) being in ABS- usually necessary to prevent at Ent ventilate the brake cylinder (57) via the pressure modulator (37) the auxiliary control chamber (13) is vented with and thereby caused the auxiliary valve means (5, 6, 8) switches in such a way that the outlet valve (5, 6) of the auxiliary valve means (5, 6, 8) in the closed position and the inlet valve (5, 8) of the auxiliary valve means (5, 6 8 ) reaches the open position, whereby the control input ( 2 ) would be connected to the control chamber ( 7 , 45 ). The consequence would be that - builds although abge due to the ABS control of the braking pressure in the Bremsyzlindern (57) should be - the brake cylinder (57) with a soft terhin from the turned-controlled by the brake signal transmitter (118) control pressure in the control chamber (7, 45 ) of the relay valve dependent device pressure would be applied.

When the ABS control process is complete, the elec trical control signal at the electrical control connection ( 68 ) of the electromagnetically operable 2/2-way valve ( 70 ) drops. The 2/2-way valve ( 70 ) switches over again in such a way that the connection between the auxiliary control chamber ( 13 ) and the control connection ( 46 ) is established. Thus, the Relaisventileinrich shown in Fig. 3 device 1 operates again like the relay valve arrangement according to FIG..

If the braking process is ended, the electrical signal at the pressure modulator ( 37 ) also drops. The pressure modulator ( 37 ) switches over in such a way that the auxiliary control chamber ( 13 ) is shut off from the compressed air reservoir ( 32 ) and connected to the atmosphere. The auxiliary control chamber ( 13 ) is vented. The auxiliary control piston ( 16 ) is pushed back into its starting position by the force of the spring ( 18 ), the outlet valve ( 5 , 6 ) of the auxiliary valve device ( 5 , 6 , 8 ) in the closed position and the inlet valve ( 5 , 8 ) of the auxiliary valve device ( 5 , 6 , 8 ) reaches the open position. The control chamber ( 7 , 45 ) of the relay valve device is then connected to the control input ( 2 ) again.

If a malfunction occurs in the electrical part of the electro-pneumatically actuated brake system, so that when the brake value transmitter ( 118 ) is actuated by the pressure modulator ( 37 ) no pressure is controlled, the auxiliary control chamber ( 13 ) remains depressurized. The inlet valve (5, 8) of the auxiliary valve means (5, 6, 8) remains in its Of fenstellung and the exhaust valve (5, 6) of the auxiliary valve means (5, 6, 8) remains closed. The Bremszylin the ( 57 ) receive no pressure from the pressure modulator ( 37 ). The compressed air controlled by the brake value transmitter ( 118 ) reaches the control input ( 2 ) of the relay valve device and from there via the opened inlet valve ( 5 , 8 ) of the auxiliary valve device ( 5 , 6 , 8 ) into the control chamber ( 7 , 45 ) of the relay valve device. A pressure dependent on the control pressure of the brake value transmitter ( 118 ) is controlled by the relay valve device and supplied to the brake cylinders ( 57 ) of the vehicle. Since in this case the pressure modulator ( 37 ) does not control any pressure, the auxiliary control chamber ( 13 ) remains depressurized, as already mentioned. The second input of the shuttle valve ( 121 ) is blocked due to the pressure difference between the two inputs of the shuttle valve ( 121 ).

Fig. 4 shows an arranged in an electro-pneumatically operated braking system of a vehicle Relaisven valve device, which has an additional piston for increasing the distance between the valve member of the combi-inlet and exhaust valve and the relay piston. With the additional piston, the relay piston moved by its control pressure is prevented from coming into contact with the valve member of the combined inlet and outlet valve of the relay valve device and the inlet valve opening when the pressure is properly controlled electrically. Since only the relay valve device in its construction differs from FIGS . 1 to 3, the same reference numerals are used for the pressure medium lines, electrical lines and devices of the brake system as in FIGS. 1 to 3.

Because the additional piston in different ways can be formed, are two versions in the figure Forms of the additional piston shown. In the The left half of the figure is the one described first first embodiment and in the right half of the Ab education is the second embodiment of the additional Pistons shown.

The relay valve device shown has a housing ( 71 , 85 ) consisting of an upper housing part ( 71 ) and a lower housing part ( 85 ). A sealing ring ( 102 ) is arranged between the upper housing part ( 71 ) and the lower housing part ( 85 ). A relay piston ( 109 ) is arranged in the upper housing part ( 71 ) so as to be movable in the direction of the longitudinal axis of the housing ( 71 , 85 ). The relay piston ( 109 ) separates a control chamber ( 107 ) from a Druckmit tel output chamber ( 72 ). A sealing ring ( 106 ) arranged on the circumference of the relay piston ( 109 ) seals the control chamber ( 107 ) and the pressure medium outlet chamber ( 72 ) from one another. The relay piston ( 109 ) has a cen trically arranged, extending into the pressure medium outlet chamber ( 72 ) tubular extension ( 111 ), in which in turn a pin ( 112 ) arranged on the upper housing part ( 71 ) extends into it. Between the outer circumferential surface of the pin ( 112 ) and the inner wall of the tubular extension ( 111 ), a sealing ring ( 113 ) is arranged, which the control chamber ( 107 ) and a pressure medium outlet ( 88 ) as well as the control chamber ( 107 ) and the pressure medium outlet chamber ( 72 ) seals against each other. The control chamber ( 107 ) is connected via a control input ( 108 ) and a pressure medium line ( 119 ) to the pressure medium output of a brake value transmitter ( 118 ) serving as a control pressure source.

In the lower housing part ( 85 ) a from a first piston part ( 90 ) and a second piston part ( 115 ) best existing additional piston ( 90 , 115 ) is arranged, which is movable in the direction of the longitudinal axis of the housing ( 71 , 85 ). The first piston part ( 90 ) has a centrally arranged, in the direction of the longitudinal axis of the housing ( 71 , 85 ) and on the pressure medium outlet chamber ( 72 ) to be extended tubular part ( 78 ), which as a connecting part for connecting the first piston part ( 90 ) with the second piston part ( 115 ). The tubular part ( 78 ) is passed through a through opening in a wall ( 83 ) of the lower housing part ( 85 ). In a circumferential groove of the tubular part ( 78 ), a sealing ring ( 81 ) is arranged, which rests on the wall through which the through opening in the wall ( 83 ) adjoins the wall. From the mutually facing sides of the first piston part ( 90 ) and the wall ( 83 ) an additional pressure medium chamber ( 84 ) be limited, which is connected via a passage in the wall ( 83 ) provided ( 82 ) with a control connection ( 80 ) , With its side facing away from the additional pressure medium chamber ( 84 ), the first piston part ( 90 ) delimits a space ( 89 ) which is connected to the pressure medium outlet ( 88 ). The additional pressure medium chamber ( 84 ) and the space ( 89 ) connected to the pressure medium outlet ( 88 ) are by means of a sealing ring ( 91 ) which is arranged on the circumference of the first piston part ( 90 ) and bears sealingly on the inner wall of the housing ( 71 , 85 ) , sealed against each other.

Coaxial with the tubular part ( 78 ) of the first piston part ( 90 ) is in a stepped through-opening ( 104 ) of the housing ( 71 , 85 ), which is between the pressure-medium outlet chamber ( 72 ) and the wall ( 83 ) of the housing ( 71 , 85 ) is located, the graduated second piston part ( 115 ) is arranged. The second piston part ( 115 ) is pot-shaped and has on its wall ( 83 ) of the housing ( 71 , 85 ) side facing a bottom ( 93 ) to which a collar-shaped recessed area ( 96 ) adjoins. The collar-shaped area ( 96 ) extends into the cup-shaped second piston part ( 115 ) and extends essentially parallel to the longitudinal axis of the tubular part ( 78 ) of the first piston part ( 90 ). On the outer surface of the tubular part ( 78 ) of the first piston part ( 90 ) facing side of the bottom ( 93 ) of the second piston part ( 115 ) a circumferential projection ( 95 ) is arranged, which in a in the outer surface of the tubular part ( 78 ) provided ringför shaped recess ( 92 ). The projection ( 95 ) and the recess ( 92 ) of the tubular part ( 78 ) interact in the manner of a snap connection, by means of which the first piston part ( 90 ) and the second piston part ( 115 ) are connected to one another.

The bottom (93) of the second piston part (115) is arranged opposite a serving as a first valve seat (74) ring-shaped body at the open end portion of the second piston part (115). The first valve seat ( 74 ) lies on a step on the inside of the cup-shaped second piston part ( 115 ) via a sealing ring ( 105 ) and is secured by means of a retaining ring ( 110 ) on the side of the valve seat ( 74 ) facing away from the step this rests and is held in a groove in the inner wall of the second piston part ( 115 ), fixed in the direction of the longitudinal axis of the second piston part ( 115 ). On the free end region of the tubular part ( 78 ) of the first piston part ( 90 ) and the free end region of the collar-shaped region ( 96 ) of the second piston part ( 115 ) facing the side of the first valve seat ( 74 ) is a ring-shaped provided with a sealing body Valve member ( 75 ) arranged. The valve member ( 75 ) has an inner tubular extension ( 114 ) and an outer tubular extension ( 98 ) and is thus to the tubular part ( 78 ) of the first piston part ( 90 ) and to the collar-shaped area ( 96 ) of the second piston part ( 115 ) arranged that both the inner tubular extension ( 114 ) and the outer tubular extension ( 98 ) face the collar-shaped area ( 96 ) of the second piston part ( 115 ). With its inner tubular extension ( 114 ) the valve member ( 75 ) lies sealingly against the outer lateral surface of the tubular part ( 78 ) and with its outer tubular extension ( 98 ) the valve member ( 75 ) lies sealingly against the outer lateral surface of the collar-shaped area ( 96 ) of the second piston part ( 115 ). The valve member ( 75 ) is movable in the direction of the longitudinal axis of the tubular part ( 78 ) of the first piston part ( 90 ) and the collar-shaped area ( 96 ) of the second piston part ( 115 ) and is on the outer surface of the tubular part ( 78 ) and the collar-shaped area ( 96 ) slidably guided. A spring ( 76 ), which is supported on the peripheral projection ( 95 ) of the second piston part ( 115 ) and is located in a spring space ( 134 ) of the second piston part ( 115 ), acts on the valve member ( 75 ) in the direction of the first valve seat ( 74 ) holds the valve member ( 75 ) under tension on the first valve seat ( 74 ).

The tubular part ( 78 ) of the first piston part ( 90 ), the valve member ( 75 ), the first valve seat ( 74 ), the second piston part ( 115 ) and the first extension to the second piston part ( 115 ) tubular extension ( 111 ) of the Relay pistons ( 109 ) are arranged coaxially to one another. The tubular extension ( 111 ) of the relay piston ( 109 ) is formed at its end facing the second piston part ( 115 ) as a second valve seat ( 73 ) au 28232 00070 552 001000280000000200012000285912812100040 0002019510492 00004 28113s. The valve member ( 75 ) together with the first valve seat ( 74 ) arranged on the second piston part ( 115 ) forms an inlet valve ( 75 , 74 ) and with the second valve seat ( 73 ) arranged on the relay piston ( 109 ) forms an outlet valve ( 73 , 75 ) combined intake and exhaust valve ( 73 , 74 , 75 ).

On the circumference of the smaller diameter area of the second piston part ( 115 ) is a first sealing ring ( 94 ) and on the circumference of the larger diameter area of the second piston part ( 115 ) a second sealing ring ( 103 ) is arranged. The sealing rings ( 94 ) and ( 103 ) lie sealingly on the wall of the housing ( 71 , 85 ) delimiting the through opening ( 104 ). Characterized, are formed in that the second piston part (115) and the through opening (104) graduated, is the outer surface of the smaller-diameter region of the second Kol benteiles (115) and the through opening (104) defining in its larger diameter portion the wall is an annular chamber serving as a first partial chamber ( 100 ), which is located between the two sealing rings ( 94 ) and ( 103 ). In the wall of the smaller diameter area of the second piston part ( 115 ) passages ( 79 ) and ( 99 ) are arranged, which are located in the area between the two sealing rings ( 94 ) and ( 103 ). About these passages ( 79 ) and ( 99 ) ei ne within the cup-shaped second Kol part ( 115 ) located second sub-chamber ( 97 ) is connected to the first sub-chamber ( 100 ) designed as an annular chamber. The second part chamber ( 97 ) and the first part chamber ( 100 ) form a pressure medium inlet chamber ( 97 , 100 ) which is connected to a pressure medium inlet ( 77 ). About the combined inlet and outlet valve ( 73 , 74 , 75 ) is the pressure medium outlet chamber ( 72 ) depending on the position of the relay piston ( 109 ) and the additional piston ( 90 , 115 ) with the Druckmit telingangskammer ( 97 , 100 ) or can be connected to the pressure medium outlet ( 88 ) leading to the atmosphere or can be shut off against both.

By grading the second piston part ( 115 ) an annular surface ( 124 ) is formed on this, which is a step ( 125 ) of the through opening ( 104 ) delimiting stepped wall opposite. The valve member ( 75 ) has a through opening ( 132 ), which is located in the region between the first valve seat ( 74 ) - inlet seat - and the second valve seat ( 73 ) - outlet seat - that the pressure medium outlet chamber ( 72 ) is always with a rear space ( 133 ) of the second piston part ( 115 ) of the additional union piston ( 90 , 115 ) connects, regardless of whether the inlet valve ( 74 , 75 ) or the outlet valve ( 73 , 75 ) be in the open position or in the closed position place. It is of course also possible the through-hole (132) instead of a z. B. provided as a housing channel formed pressure medium line, which connects the pressure medium outlet chamber ( 72 ) to the rear space ( 133 ).

This measure compensates for the pressure forces acting on the two piston parts ( 115 ), so that the additional piston ( 90 , 115 ) can react very sensitively to pressure changes in the additional pressure medium chamber ( 84 ).

With the annular surface ( 124 ) on the second piston part ( 115 ) it is achieved that when the additional pressure medium chamber ( 84 ) becomes depressurized, the additional piston ( 90 , 115 ) of the pressure medium in the pressure medium input chamber ( 100 , 97 ) is returned to its starting position.

The pressure medium inlet ( 77 ) is connected via the pressure medium line ( 54 ) and the pressure medium line ( 36 ) to the compressed air supply container ( 32 ) serving as a pressure medium source. The pressure medium outlet chamber ( 72 ) is via a pressure medium outlet ( 101 ) and the pressure medium line ( 122 ) as well as the first input and the output of the shuttle valve ( 121 ) and the pressure medium line ( 120 ) connected to the outlet of the shuttle valve ( 121 ) with the brake cylinders ( 57 ) of the electro-pneumatically actuated vehicle brake system. As already mentioned, the control chamber ( 107 ) is connected via the control connection ( 108 ) and the pressure medium line ( 119 ) to the pressure medium outlet of the brake value transmitter ( 118 ) serving as a control pressure source. A pressure medium input of the brake value transmitter ( 118 ) is connected to the compressed air supply container ( 32 ) via the pressure medium line ( 117 ) and the pressure medium line ( 36 ). Via the passage ( 82 ) provided in the wall ( 83 ) of the housing ( 71 , 85 ) and the control connection ( 80 ) and the pressure medium line ( 38 ) into which a further valve device designed as an electromagnetically actuatable 2/2-way valve ( 128 ) is formed is switched, the additional pressure medium chamber ( 84 ) can be connected to the output of the electrically controllable pressure modulator ( 37 ), the input of which is connected to the compressed air reservoir ( 32 ) via the pressure medium line ( 36 ). The electrical control connection ( 35 ) of the pressure modulator ( 37 ) is connected to the output of the electrical control device ( 33 ) via the electrical control line ( 34 ). An electrical control connection ( 127 ) of the 2/2-way valve ( 128 ) is also connected to an output of the electrical control device ( 33 ) via an electrical control line ( 129 ). The output of the pressure modulator ( 37 ) is additionally connected to a second input of the shuttle valve ( 121 ). The electrical control output of the brake value transmitter ( 118 ) is connected via the electrical control line ( 116 ) to an input of the electrical control device ( 33 ).

The function of the relay valve described above device in the electro-pneumatically operated brake plant is explained in more detail below.

When the brake is not applied, the Relaisven valve device is in the position shown. The pressure medium outlet chamber ( 72 ) and the control chamber ( 107 ) and the additional pressure medium chamber ( 84 ) are depressurized. In the pressure medium inlet chamber ( 97 , 100 ) there is supply pressure from the compressed air storage container ( 32 ). The opposing, from the pressure in the pressure medium input chamber ( 97 , 100 ) acted surfaces of the second piston part ( 115 ) are dimensioned so that the additional piston ( 90 , 115 ) due to the enlarged by the annular surface ( 124 ) an active surface in Rich direction to the pressure medium outlet chamber ( 72 ) and so the additional piston ( 90 , 115 ) with its first piston part ( 90 ) is held on a wall ( 83 ) arranged on the first stop ( 131 ) for the additional piston ( 90 , 115 ) ,

If braking is initiated by actuating the pedal of the brake value transmitter ( 118 ), compressed air serving as control pressure flows from the brake value transmitter ( 118 ) into the control chamber ( 107 ). At the same time, when the pedal of the brake value transmitter ( 118 ) is actuated, this gives an electrical control signal to the electrical control device ( 33 ). This in turn gives an electrical control signal to the electrical control connection ( 35 ) of the pressure modulator ( 37 ) via the electrical control line ( 34 ). The pressure modulator ( 37 ) then controls a pressure which is dependent on the position of the pedal of the brake value transmitter ( 118 ). The compressed air controlled by the pressure modulator ( 37 ) passes through the open 2/2-way valve ( 128 ), the pressure medium line ( 38 ) and the control connection ( 80 ) as well as the passage ( 82 ) in the wall ( 83 ) of the housing ( 71 , 85 ) in the additional pressure medium chamber ( 84 ) and on the other hand via the second input and the output of the shuttle valve ( 121 ) in the brake cylinder ( 57 ), the first input of the shuttle valve ( 121 ) being blocked.

When the force of the pressure which builds up in the additional pressure medium chamber ( 84 ) and acts on the first piston part ( 90 ) has become so great that it forces the force of the second piston part ( 115 ), which acts in the opposite direction to the ring surface ( 124 ). pressure acting overcomes, the existing from the first piston part ( 90 ) and the second piston part ( 115 ) existing existing piston ( 90 , 115 ) from the pressure in the additional pressure medium chamber ( 84 ) towards the pressure medium outlet chamber ( 72 ) and the valve seat ( 73 ) of the relay piston ( 109 ) moved away until the first piston part ( 90 ) comes to rest on a second stop ( 130 ) arranged on the bottom of the lower housing part ( 85 ). The control pressure building up simultaneously in the control chamber ( 107 ) of the relay valve device causes the relay piston ( 109 ) to move in the direction of the pressure medium outlet chamber ( 72 ) and in the direction of the second piston part ( 115 ) of the additional piston ( 90 , 115 ) until it comes to rest against a stop ( 123 ) in the housing ( 71 , 85 ). Since the additional piston ( 90 , 115 ) carrying the first valve seat ( 74 ) and the valve member ( 75 ) has been moved away from the pressure in the additional pressure medium chamber ( 84 ) in the direction of the relay piston ( 109 ), as a result of which the distance between the Additional piston ( 90 , 115 ) arranged valve member ( 75 ) of the combined intake and exhaust valve ( 73 , 74 , 75 ) and the relay piston ( 109 ) has increased, the second valve seat ( 73 ) arranged on the relay piston ( 109 ) cannot on the on the additional piston ( 90 , 115 ) arranged valve member ( 75 ). The outlet valve ( 73 , 75 ) of the combined inlet and outlet valve ( 73 , 74 , 75 ) cannot be closed for the above reason and the inlet valve ( 74 , 75 ) of the combined inlet and outlet valve ( 73 , 74 , 75 ) cannot be opened. No pressure is thus controlled by the relay valve device. In the brake cylinder ( 57 ) of the vehicle only the compressed air coming from the pressure modulator ( 37 ) is controlled.

If the braking process is to be ended, the pedal of the brake value transmitter ( 118 ) is brought into its starting position and the control chamber ( 107 ) of the relay valve device is vented via the brake value transmitter ( 118 ).

At the same time, the electrical control signal on the electrical control device ( 33 ) and on the pressure modulator ( 37 ) drops. The pressure modulator ( 37 ) switches over in such a way that the additional pressure medium chamber ( 84 ) and the brake cylinders ( 57 ) are shut off from the compressed air reservoir ( 32 ) and connected to the atmosphere via the pressure modulator ( 37 ). If the pressure in the additional pressure medium chamber ( 84 ) has dropped so far that the force of the pressure on the annular surface ( 124 ) having the active surface of the second piston part ( 115 ) acting pressure in the pressure medium input chamber ( 97 , 100 ) is greater than the force of the pressure acting in the opposite direction on the first piston part ( 90 ) in the additional pressure medium chamber ( 84 ), the additional piston ( 90 , 115 ) from the pressure in the pressure medium inlet chamber ( 97 , 100 ) in the direction of the pressure medium outlet chamber ( 72 ) moved so far until he comes with his most piston part ( 90 ) at the first stop ( 131 ). In this process, the valve member ( 75 ) comes to rest on the valve seat ( 73 ) and moves the relay piston ( 109 ) towards the control chamber ( 107 ). The spring ( 76 ) which loads the valve member ( 75 ) in the closing direction of the inlet valve ( 74 , 75 ) is designed so that its force is sufficient to prevent an unwanted opening of the inlet valve ( 74 , 75 ) during this process.

If a defect occurs in the electrical part of the electro-pneumatically actuated brake system, so that no electrical control signal arrives at the electrical control connection ( 35 ) of the pressure modulator ( 37 ), or the pressure modulator ( 37 ) is defective, so that there is no pressure from it is controlled, the additional pressure medium chamber ( 84 ) remains connected to the atmosphere via the pressure modulator ( 37 ) even when the Bremswertge sensor ( 118 ) is actuated. No brake pressure is fed into the brake cylinders ( 57 ) by the pressure modulator ( 37 ). The additional piston ( 90 , 115 ) remains in its initial position, in which it acts with its first piston part ( 90 ) in the pressure medium inlet chamber ( 97 , 100 ) due to the force of the supply pressure acting on its effective area enlarged by the ring surface ( 124 ). is held at the first stop ( 131 ). The pressure applied by the brake value transmitter ( 118 ) into the control chamber ( 107 ) of the relay valve device causes the relay piston ( 109 ) to move in the direction of the additional piston ( 90 , 115 ) and thus in the direction of the combined inlet and outlet valve ( 73 , 74 , 75 ). The valve seat ( 73 ) arranged on the relay piston ( 109 ) rests on the valve member ( 75 ). The outlet valve ( 73 , 75 ) of the combined inlet and outlet valve ( 73 , 74 , 75 ) comes into the closed position. When the relay piston ( 109 ) moves further downward, the valve member ( 75 ) is lifted off the valve seat ( 74 ). The inlet valve ( 74 ) of the combined inlet and outlet valve ( 73 , 74 , 75 ) comes into the open position. Compressed air now flows from the pressure medium inlet chamber ( 97 , 100 ) through the open inlet valve ( 74 , 75 ) of the combined inlet and outlet valve ( 73 , 74 , 75 ) into the pressure medium outlet chamber ( 72 ) and from there through the pressure medium outlet ( 101 ) , the pressure medium line ( 122 ), the first input and the output of the shuttle valve ( 121 ), the second input of the shuttle valve ( 121 ) being blocked, to the brake cylinders ( 57 ) of the vehicle. A pressure dependent on the control pressure in the control chamber ( 107 ) of the relay valve device is then introduced into the brake cylinders ( 57 ) of the vehicle. At the same time, through the through opening ( 132 ) in the valve member ( 75 ), compressed air from the pressure medium outlet chamber ( 72 ) enters the rear space ( 133 ) of the second piston part ( 115 ), so that the balance between the front and the rear of the second piston part ( 115 ) acting forces.

If the braking process is to be ended, the control chamber ( 107 ) of the relay valve device is vented via the brake value transmitter ( 118 ). Due to the pressure difference occurring between the pressure in the control chamber ( 107 ) and the pressure in the pressure medium outlet chamber ( 72 ), the relay piston ( 109 ) returns to its initial position. The inlet valve ( 74 , 75 ) closes and the outlet valve ( 73 , 75 ) of the combined inlet and outlet valve ( 73 , 74 , 75 ) reaches the open position. The brake cylinders ( 57 ) are vented to the atmosphere via the Druckmit tel exit chamber ( 72 ) and the exhaust valve ( 73 , 75 ) of the combined intake and exhaust valve ( 73 , 74 , 75 ) and the pressure fluid outlet ( 88 ) of the Relaisventileinrich device. Likewise, the rear space ( 133 ) via the passage opening ( 132 ) and the pressure medium outlet chamber ( 72 ) and the pressure medium outlet ( 88 ) is vented.

If the vehicle is equipped with an anti-lock control system, an electrical control signal is usually sent from the electrical control device ( 33 ) via the electrical control line ( 129 ) to the electrical control connection ( 127 ) of the electromagnetically actuated 2/2-way valve ( 128 ). given. The 2/2-way valve ( 128 ) switches over in such a way that the connection between the additional pressure medium chamber ( 84 ) and the pressure modulator ( 37 ) is interrupted. The pressure in the additional pressure medium chamber ( 84 ) is maintained. This shut-off of the additional pressure medium chamber ( 84 ) against the pressure modulator ( 37 ) is required in the ABS rule, in order to prevent the additional pressure medium chamber ( 84 ) from being vented when the brake cylinder ( 57 ) is vented via the pressure modulator ( 37 ) and this causes the additional piston ( 90 , 115 ) to return to its starting position - first piston part ( 90 ) at the first stop ( 131 ) - and thus the outlet valve ( 73 , 75 ) of the relay valve device into the closed position and the inlet valve ( 74 , 75 ) Relay valve device reaches the open position. The consequence would be that the brake cylinders ( 57 ) would be pressurized with a pressure dependent on the control pressure in the control chamber ( 107 ) of the relay valve device.

If the ABS control process is completed, the elec tric control signal at the electrical control connection ( 127 ) of the electromagnetically operable 2/2-way valve ( 128 ) drops. The 2/2-way valve then switches over in such a way that the connection between the additional pressure medium chamber ( 84 ) and the pressure modulator is restored.

As shown in the right half of the drawing ( Fig. 4) Darge, it is also possible to replace the tubular part of the most piston part by a second piston part ( 115 ) arranged tube ( 126 ) and this tube ( 126 ) then by a through opening in a first piston part ( 86 ) of the additional piston. In this exemplary embodiment, the tube ( 126 ) with the second piston part ( 115 ) is designed as a one-piece construction unit.

In the transition area from the second piston part ( 115 ) to the tubular part ( 126 ) there is at least one through opening ( 135 ) in the area between the outer outer surface of the tubular part ( 126 ) and the collar-shaped recessed area ( 96 ) of the second piston part ( 115 ) Connection of the piston rear chamber ( 133 ) with the spring chamber ( 134 ) located in the second piston part ( 115 ).

A stop ( 87 ) is arranged on the free end region of the tube ( 126 ) which extends through the through opening in the first piston part ( 86 ) and extends into the space ( 89 ), on which the first piston part ( 86 ) of the additional piston ( 86 , 115 ) and when the additional pressure medium chamber ( 84 ) is pressurized, the tube ( 126 ) connected to the second piston part ( 115 ) and thus also the second piston part ( 115 ) carrying the valve seat ( 74 ) and the valve member ( 75 ) in Takes direction away from the relay piston ( 109 ). A sealing element, which seals the additional pressure medium chamber ( 84 ) and the space ( 89 ) against one another, must be arranged between the wall delimiting the through opening in the first piston part ( 86 ) and the outer circumferential surface of the tube ( 126 ). If the first piston part ( 86 ), as shown, is designed as a membrane piston consisting of a membrane and a membrane plate, the membrane seals the tube ( 126 ).

The connecting part for connecting the first piston part ( 86 ) with the second piston part ( 115 ) serving tubular part ( 126 ) can also be detachable with the second piston part ( 115 ), for. B. by a snap or snap connection, or by other connecting means, connected or integrally formed with the second piston part ( 115 ) (right half of the drawing, Fig. 4).

The first piston part ( 86 ) or ( 90 ) and the second piston part ( 115 ) and the connecting part serving as the tubular part ( 126 ) or ( 78 ) and the combined inlet and outlet valve ( 73 , 74 , 75 ) can Of course, it can also be designed differently than described above and connected to one another.

Of importance for the embodiments of the subject matter shown in FIG. 4 is that the combined inlet and outlet valve ( 73 , 74 , 75 ) is arranged in the housing of the relay valve device and is connected to the additional piston that when the additional is applied Piston with pressure medium at least one valve seat and with this valve seat and a further valve seat arranged on the relay piston, the combined inlet and outlet valve ( 73 , 74 , 75 ) forming valve member by the additional piston are brought into a position in which the inlet valve from Relay piston not in its open position and the exhaust valve from the relay piston can not be brought into its closed position.

In Figs. 1 to 3, the auxiliary control piston and in Fig. 4, the second half of the picture, the additional piston is formed as a diaphragm piston. The auxiliary control piston or the additional piston can of course also be designed as a piston which can be pushed in a housing bore in the direction of its longitudinal axis and which is made of metal or plastic. Since a diaphragm piston works with almost no loss of friction, the auxiliary control piston or the additional piston can react very sensitively to changes in pressure. Therefore, in the relay valve device according to the invention, an auxiliary control piston or additional piston designed as a membrane piston is preferably used.

The auxiliary valve device operable by the auxiliary control piston according to FIGS . 1 to 3 can of course also be designed differently than shown in FIGS. 1 to 3. Of importance for the embodiment of the invention shown in FIGS . 1 to 3 is that an auxiliary valve device which can be actuated by an auxiliary control piston is provided, via which the control chamber of the relay valve device can optionally be connected to a control pressure source or to the atmosphere.

The embodiment of the invention shown in FIG. 4 offers the particular advantage of being able to dispense with an auxiliary valve device. By means of an additional part connected to parts of the combined inlet and outlet valve already present in the relay valve device, the actuation of the combined inlet and outlet valve can be influenced.

The relay valve device according to the invention is as on hand explained the above embodiments, be especially suitable for use in an electrical ge controlled braking system. However, it is also possible to do this  Relay valve device in other facilities and on were to be used in which a pressure medium operated Setup only if a predetermined loading is present condition with one from the relay valve device controllable pressure can be applied or alternatively with the pressure controllable by the relay valve device or a pressure from another pressure medium source should be openable. In the described embodiment For example, this condition is the lack of printing kes from the pressure modulator.

The valve device ( 37 ) can be designed as a pressure modulator or as a simple 3/2-way valve that can be controlled by a pressure medium or electrically.

For the sake of simplicity, there is only one in the drawing Compressed air reservoir shown. However, it is of course, that in a multi-circuit brake several compressed air storage containers are arranged, the different circles of the brake system assigned are. That entered into the pressure medium inlet chamber Pressure medium and that in the control chamber of the relay valve pressure device to be controlled comes usually from two separate pressure medium reservoirs food holding.

Compressed air or another can be used as the pressure medium serve gaseous or liquid medium.

Claims (21)

1. Relay valve device with the following features:

• a) in a housing ( 20 , 1 ) are provided with a pressure medium inlet ( 41 ) pressure medium inlet chamber ( 30 ), a pressure medium outlet ( 29 ) provided with pressure medium outlet chamber ( 23 ) and a pressure medium outlet leading to a pressure medium sink ( 39 );
• b) there is a combined inlet and outlet valve ( 25 , 26 , 27 ) consisting of an inlet valve ( 26 , 27 ) and an outlet valve ( 25 , 27 ), via which the pressure medium outlet chamber ( 23 ) optionally with the pressure medium inlet chamber ( 30 ) or can be connected to the pressure medium outlet ( 39 ) or can be blocked against both;
• c) for actuating the combined inlet and outlet valve ( 25 , 26 , 27 ) is used a relay piston ( 22 ) which separates the pressure medium outlet chamber ( 23 ) from a control chamber ( 45 , 7 ) connected to a control input ( 2 );

characterized by the following features:

• a) in an arranged in the housing ( 20 , 1 ) pressure medium line ( 3 , 51 ), which serves to connect the control chamber ( 45 , 7 ) to the control input ( 2 ), is an inlet valve ( 5 , 8 ) and an outlet valve ( 5 , 6 ) auxiliary valve device ( 5 , 6 , 8 ) arranged, by means of which the control chamber ( 45 , 7 ) can be connected either to a control pressure source ( 118 ) or to a pressure medium sink.
• b) for actuating the auxiliary valve device ( 5 , 6 , 8 ) is also a Ge in the housing ( 20 , 1 ) of the relay valve device arranged auxiliary control piston ( 16 ) is provided by a control pressure medium against a restoring force in the closing direction of the inlet valve ( 5 , 8 ) and in the opening direction of the exhaust valve (5, 6) of the auxiliary valve means (5, 6, 8) can be acted upon.

2. Relay valve device according to claim 1, characterized in that the auxiliary valve device ( 5 , 6 , 8 ) and the auxiliary control piston ( 16 ) coaxially to the relay piston ( 22 ) and coaxially to the combined inlet and outlet valve ( 25 , 26 , 27 ) of the relay valve device are arranged, wherein the outlet valve (5, 6) of the auxiliary valve means (5, 6, 8) and the outlet valve (25, 27) of the combined inlet and outlet valve (25, 26, 27) of Relaisventileinrich tung with both exhaust valves ( 5 , 6 ) and ( 25 , 27 ) common pressure medium outlet ( 39 ) of the relay valve device are connected. 3. Relay valve device according to claim 2, characterized by the following features:

• a) the auxiliary valve device ( 5 , 6 , 8 ) consists of an annular A lassventilsitz ( 8 ), an exhaust valve seat ( 6 ) which is arranged at the free end of a centrally on the auxiliary control piston ( 16 ) and through the inlet valve seat ( 8 ) guided plunger (15) is arranged, and a movable relative to the inlet valve seat (8) and the outlet valve (6) toward the inlet valve seat (8) and the outlet valve (6) to a spring (4) loaded valve member (5);
• b) the auxiliary control piston ( 16 ) and the plunger ( 15 ) have a through hole ( 17 ) extending in the direction of their longitudinal axis to the part of the outlet valve ( 5 , 6 ) via which the control chamber ( 7 , 45 ) of the relay valve device with a ventilation space ( 48 ) is connectable;
• c) the ventilation space ( 48 ) is separated on the one hand by the auxiliary control piston ( 16 ) from an auxiliary control chamber ( 13 ) delimited by the auxiliary control piston ( 16 ) and on the other hand by a housing wall ( 19 ) from the control chamber ( 7 , 45 ) of the relay valve device in the housing ( 20 , 1 ) arranged net;
• d) on the side of the housing wall ( 19 ) facing away from the ventilation space ( 48 ), a peg-like extension ( 24 ) is arranged centrally, which seals through the relay piston ( 22 ) and the outlet valve seat ( 25 ) of the combined inlet and outlet valve ( 25 , 26 , 27 ) is passed and extends in the direction of the pressure medium outlet chamber ( 23 );
• e) the auxiliary control chamber ( 13 ) is delimited from the ventilation space ( 48 ) facing away from the side of the auxiliary control piston ( 16 ) and a wall ( 12 ) between the inlet valve seat ( 8 ) of the auxiliary valve device ( 5 , 6 , 8 ) and the auxiliary control piston ( 16 ) is arranged and the auxiliary control chamber ( 13 ) from the control chamber ( 7 , 45 ) separates;
• f) the inlet valve seat (8) and the outlet valve (6) and the valve member (5) of the auxiliary valve means (5, 6, 8) on which the auxiliary control chamber (13) side facing away from the wall (12) in a, as a pressure medium line (3 51 ) for connecting the control chamber ( 7 , 45 ) to the control input ( 2 ) serving recess ( 3 , 51 );
• g) the plunger ( 15 ) is sealed by means of a sealing ring ( 50 ) through a passage ( 49 ) arranged coaxially to the plunger ( 15 ) in the wall ( 12 );
• h) the peg-like extension ( 24 ) of the wall ( 19 ) has a through hole ( 40 ) running in the direction of its longitudinal axis, via which the ventilation space ( 48 ) is connected to the pressure medium outlet ( 39 ).

4. Relay valve device according to claim 3, characterized in that the auxiliary control chamber ( 13 ) via a valve device ( 37 ) either with a pressure medium source ( 32 ) or with a pressure medium sink can be connected or shut off against both. 5. Relay valve device according to claim 4, characterized in that the auxiliary control chamber ( 13 ) by means of a further valve device ( 70 , 65 ), which is arranged in a valve means ( 37 ) with the auxiliary control chamber ( 13 ) connecting pressure medium line ( 38 , 47 ), can be shut off against the valve device ( 37 ). 6. Relay valve device according to claim 5, characterized in that the further valve device ( 70 , 65 ) is designed as an electromagnetically actuated 2/2-way valve ( 70 ). 7. Relay valve device according to claim 5, characterized in that the further valve device ( 70 , 65 ) is designed as a double check valve ( 65 ). 8. Relay valve device according to claim 7, characterized by the following features:

• a) the double check valve ( 65 ) consists of a first check valve ( 56 , 66 ) and a second check valve ( 59 , 66 );
• b) the first check valve ( 56 , 66 ) is designed such that it can be brought into the open position by the pressure medium controlled by the valve device ( 37 ) in the direction of the auxiliary control chamber ( 13 );
• c) the second check valve ( 59 , 66 ) is designed so that it can be brought into the open position from the pressure medium of the auxiliary control chamber ( 13 ) in the direction of the control input ( 2 ) of the relay valve device if there is no control pressure at the control input ( 2 ) is.

9. Relay valve device according to claim 8, characterized in that the double check valve ( 65 ) is arranged in a recess ( 60 ) of the housing ( 1 , 20 ) of the relay valve device, a serving as an output chamber recess ( 64 ) of the double check valve ( 65 ) via a a channel ( 47 ) arranged in the housing ( 20 , 1 ) with the auxiliary control chamber ( 13 ), a space ( 55 ) of the double check valve ( 65 ) serving as an input chamber with a control connection ( 46 ) of the housing ( 20 ) connected to the pressure medium source (valve device 37 ) , 1 ) and serving as an outlet chamber ( 62 ) of the double check valve ( 65 ) via a housing channel ( 63 ) is connected to the control input ( 2 ) of the relay valve device. 10. Relay valve device according to claim 7, characterized by the following features:

• a) the double check valve ( 65 ) has a carrier ( 61 ) arranged in a recess ( 60 ) of the housing ( 1 , 20 ) of the relay valve device for a first sealing lip ( 56 ) and a second sealing lip ( 59 );
• b) the first sealing lip ( 56 ) bears against the wall ( 66 ) delimiting the recess ( 60 ) for receiving the carrier ( 61 ) and thus forms the first check valve ( 56 ) with the carrier ( 61 ) and the wall ( 66 ) , 66 ), which can be brought from the pressure medium of the pressure medium source (Ventileinrich device 37 ) in the direction of the auxiliary control chamber ( 13 ) into the open position;
• c) the second sealing lip ( 59 ) is under tension on the recess ( 60 ) for receiving the support ( 61 ) delimiting wall ( 66 ) and forms with the support ( 61 ) and with the wall ( 66 ) the second back Impact valve ( 59 , 66 ), which can be brought into the open position by the pressure medium of the auxiliary control chamber ( 13 ) in the direction of the control input ( 2 ) of the relay valve device.

11. Relay valve device according to claim 6, characterized in that the electromagnetically actuated 2/2-way valve ( 70 ) is arranged in a recess ( 69 ) of the housing ( 1 , 20 ) of the relay valve device, a pressure medium input of the 2/2-way valve ( 70 ) with a control connection ( 46 ) of the relay valve device and a pressure medium outlet of the 2/2-way valve ( 70 ) via a pressure medium line ( 47 ) in the housing ( 20 , 1 ) of the relay valve device with the auxiliary control chamber ( 13 ). 12. Relay valve device with the following features:

• a) in a housing ( 71 , 85 ) are provided with a pressure medium inlet ( 77 ) pressure medium inlet chamber ( 97 , 100 ), a pressure medium outlet ( 101 ) with a pressure medium outlet chamber ( 72 ) and a pressure medium outlet ( 88 ) leading to a pressure medium sink hen;
• b) there is a combined inlet and outlet valve ( 73 , 74 , 75 ) consisting of an inlet valve ( 74 , 75 ) and an outlet valve ( 73 , 75 ), via which the pressure medium outlet chamber ( 72 ) optionally with the pressure medium inlet chamber ( 97 , 100 ) or with the Druckmittelaus let ( 88 ) connectable or lockable against both;
• c) for actuating the combined inlet and outlet valve ( 73 , 74 , 75 ) a relay piston ( 109 ) is used which separates the pressure medium outlet chamber ( 72 ) from a control chamber ( 107 ) connected to a control input ( 108 );

characterized in that an additional piston ( 90 , 86 , 115 ) which can be acted upon by the pressure medium of a pressure medium source is arranged in the housing ( 71 , 85 ) and is connected to a valve member ( 74 , 75 ) of the combined inlet and outlet valve ( 73 , 74 , 75 ) is connected in such a way that when the additional piston ( 90 , 86 , 115 ) is acted upon by the pressure medium from the pressure medium source, the distance between the valve member ( 74 , 75 ) of the combined inlet and outlet valve ( 73 , 74 , 75 ) and the relay piston (109) in the sense of preventing an actuation of the combined inlet and outlet valve (73, 74, 75) is increased by the relay piston (109). 13. Relay valve device according to claim 12, characterized by the following features:

• a) the additional piston ( 90 , 86 , 115 ) is on the pressure medium outlet chamber ( 72 ) facing side of the relay piston ( 109 ), in the direction of the longitudinal axis of the housing ( 71 , 85 ) movable, arranged in the housing ( 71 , 85 ) ;
• b) the additional piston ( 90 , 86 , 115 ) consists of a first piston part ( 90 , 86 ) and a second piston part ( 115 ) connected to it and formed as a stepped piston, the two piston parts ( 90 , 86 and 115 ) lying one behind the other and are arranged substantially coaxially to each other;
• c) the second piston part ( 115 ) is located between the relay piston ( 109 ) and the first piston part ( 86 , 90 ) and serves as a carrier for a first valve seat ( 74 ) and a valve member ( 75 ) movable relative to the latter;
• d) the valve member (75) forms with the first valve seat (74) the inlet valve (74, 75) and having disposed on the relay piston (109) second valve seat (73) the outlet valve (73, 75);
• e) a wall ( 83 ) is arranged in the housing ( 71 , 85 ) between the first piston part ( 86 , 90 ) and the second piston part ( 115 ), which has a piston rear space ( 133 ) with its side facing the second piston part ( 115 ) limited and with its piston rear chamber ( 133 ) facing side and the first piston part ( 90 , 86 ) of the additional piston ( 90 , 86 , 115 ) forms an additional pressure medium chamber ( 84 );
• f) the first piston part ( 90 , 86 ) is connected to the second piston part ( 115 ) via a tubular part ( 78 , 126 ) which extends through an opening in the wall ( 83 ) onto the outlet valve ( 73 , 75 ) , with the pressure medium outlet chamber ( 72 ) having a space on the side of the additional piston ( 90 , 86 , 115 ) facing away from the additional pressure medium chamber ( 84 ) via the tubular part ( 78 , 126 ) with the outlet valve ( 73 , 75 ) open. 89 ) is connected to which the pressure medium outlet ( 88 ) of the relay valve device closes;
• g) the first valve seat ( 74 ) and the valve member ( 75 ) are arranged in the second piston part ( 115 ) of the additional piston ( 90 , 86 , 115 ) and thus to the relay piston ( 109 ) carrying the second valve seat ( 73 ), that in a first position of the additional piston ( 90 , 86 , 115 ), in which the additional pressure medium chamber ( 84 ) is depressurized, the distance between the relay piston ( 109 ) and the combined inlet and outlet valve ( 73 , 74 , 75 ) is dimensioned such that the combined inlet and outlet valve ( 73 , 74 , 75 ) can be actuated by the relay piston ( 109 ) and in a second position of the additional piston ( 90 , 86 , 115 ), in which the additional pressure medium chamber ( 84 ) is struck by a control pressure, the distance between the relay piston ( 109 ) and the combined inlet and outlet valve ( 73 , 74 , 75 ) is dimensioned such that actuation of the combined inlet and outlet valve ( 73 , 74 , 75 ) through the re the lais piston ( 109 ) is prevented;
• h) there is a connecting line for permanent connection of the pressure medium outlet chamber ( 72 ) with the piston rear space ( 133 ) of the second piston part ( 115 ) of the additional piston ( 90 , 86 , 115 );
• i) the second piston part ( 115 ) has an annular surface ( 124 ) which is arranged on the second piston part ( 115 ) such that the additional piston ( 90 , 86 , 115 ) from the pressure medium of the pressure medium inlet chamber ( 97 , 100 ) in the direction the pressure medium outlet chamber ( 72 ) is too loaded.

14. Relay valve device according to at least one of the preceding claims 12 or 13, characterized in that a valve device ( 37 ) is provided, by means of which the additional pressure medium chamber ( 84 ) can be connected to a pressure medium source ( 32 ) or to a pressure medium sink or can be shut off against both , 15. Relay valve device according to claim 14, characterized in that the additional pressure medium chamber ( 84 ) by means of a further valve device ( 128 ), which is arranged in a the valve device ( 37 ) with the additional Druckmit telkammer ( 84 ) connecting pressure medium line ( 38 ) against the valve device ( 37 ) can be shut off. 16. Relay valve device according to claim 13, characterized by the following features:

• a) the second piston part ( 115 ) is pot-shaped and has a bottom ( 93 ) with a collar-shaped retracted area ( 96 ), which extends into the second piston part ( 115 ) and essentially parallel to the longitudinal axis of the tubular part ( 78 , 126 ) extends and the tubular part ( 78 , 126 ) surrounds part of its axial extent;
• b) the open end region of the second piston part ( 115 ) points towards the relay piston ( 109 ) and carries the first valve seat ( 74 ) which is designed as an annular body;
• c) the valve member ( 75 ) is annular and is guided in a sealed, sliding manner on the free end region of the tubular part ( 78 , 126 ) which extends into the second piston part ( 115 );
• d) the valve member ( 75 ) is held by a spring ( 76 ) on the first valve seat ( 74 ) and forms with this the inlet valve ( 74 , 75 ) of the combined inlet and outlet valve ( 73 , 74 , 75 );
• e) the second valve seat ( 73 ) arranged on the relay piston ( 109 ) forms with the valve member ( 75 ) and the tubular part ( 78 ) the outlet valve ( 73 , 75 ) of the combined inlet and outlet valve ( 73 , 74 , 75 );
• f) one of the outer surface of the collar-shaped area ( 96 ), the bottom ( 93 ) and the inner wall of the cup-shaped two-th piston part ( 115 ) and the inlet valve ( 74 , 75 ) limited space ( 97 ) is in the wall of Pot-shaped second piston part ( 115 ) provided passages ( 79 , 99 ) with an annular chamber ( 100 ) in connection, which from the outer lateral surface of the second piston part ( 115 ) and which the stepped housing recess for receiving me also the graduated second piston part ( 115 ) delimiting wall ( 104 ) is limited and communicates with the pressure medium input ( 77 ) of the relay valve device;
• g) the space ( 97 ) and the annular chamber ( 100 ) serve as pressure medium input chamber ( 97 , 100 ) for the relay valve device;
• h) the pressure medium outlet chamber ( 72 ) is limited on the one hand by the relay piston ( 109 ) and on the other hand by the second piston part ( 115 ) and the combined inlet and outlet valve ( 73 , 74 , 75 ).
• i) the annular surface ( 124 ) is formed by the step of the second piston part ( 115 );
• j) the annular surface ( 124 ) of the second piston part ( 115 ) lies opposite a step ( 125 ) of the wall ( 124 ) formed by the gradation of the wall ( 104 ).

17. Relay valve device according to at least one of the preceding claims 13 or 16, characterized by the following features:

• a) the second piston part ( 115 ) is connected to a tubular part ( 126 ) which, from the second piston part ( 115 ) away through a through opening in the wall ( 83 ) and further through a in the first piston part ( 86 ) centrally arranged through opening extends in the direction of the pressure medium outlet ( 88 ) of the relay valve device;
• b) the first piston part ( 86 ) is arranged on the first extending on the pressure medium outlet ( 88 ) free end portion of the tubular part ( 126 ) in Rich direction of the longitudinal axis of the tubular part ( 126 );
• c) on the free end region of the tubular part ( 126 ) there is a stop ( 87 ) against which the first piston part ( 86 ) rests;
• d) the stop ( 87 ) is arranged on the tubular part ( 126 ) that when the first piston part ( 86 ) moves in the direction away from the wall ( 83 ), the second piston part ( 115 ) from the first piston part ( 86 ) in Rich device is taken away from the relay piston ( 109 ).

18. Relay valve device according to at least one of the preceding claims 13 or 17, characterized in that the first piston part ( 90 , 86 ) and the second piston part ( 115 ) are connected to one another by means of a snap connection ( 95 , 92 ). 19. Relay valve device according to claim 17, characterized in that the tubular part ( 126 ) is integrally formed with the second piston part ( 115 ), wherein in the transition region from the second piston part ( 115 ) to the rohrföhrmi gene part ( 126 ) in the region between the outer lateral surface of the tubular part ( 126 ) and the collar-shaped retracted area ( 96 ) of the second piston part ( 115 ) at least one through opening ( 135 ) for connec tion of the piston rear space ( 133 ) with a in the second piston part ( 115 ) located spring chamber ( 134 ) is. 20. Relay valve device according to claim 13, characterized in that the connecting line of a through the valve member ( 75 ) penetrating through opening ( 132 ) is formed, the valve seat in the region between the second Ven ( 73 ) and the first valve seat ( 74 ) of the combined inlet - And from lassventils ( 73 , 74 , 75 ) in the valve member ( 75 ) is arranged. 21. Relay valve device according to claim 13, characterized in that the first piston part ( 86 ) of the additional piston ( 86 , 126 , 115 ) is designed as a membrane piston ben.