Wabco Gmbh

Wabco Westinghouse Fahrzeugbremsen Gmbh

Wabco Gmbh & Co Ohg

Wabco Standard Gmbh

Wabco Vermogensverwaltungs Gmbh

Hartmut Geiger

Johann Lucas

Karl-Heinrich Schonfeld

Uwe Lentz

Reinhard Gocz

Andreas Russ

Dieter Zimpel

A pneumatic suspension system for a vehicle includes pneumatic bellows connectable by means of a valve arrangement to at least one other component of the pneumatic suspension system in order to selectively increase or decrease the amount of compressed air therein. The other component contains at least one volume. Undesirable changes in the amount of compressed air inside the pneumatic bellows arising as a result of pressure compensation are avoided or reduced to a non-disruptive level by a return valve between the valve arrangement and the volume which prevents compressed air from flowing between the pneumatic bellows and the volume in one direction of flow.

Pneumatic suspension system for a vehicle

A pneumatic suspension system for a vehicle includes a compressed air accumulator, a compressed air transport device, at least one pneumatic bellows and an electrically controllable reversing valve used to connect the compressed air accumulator to a suction connection of the compressed air transport device, in order to increase the amount of air in the pneumatic bellows in a first switching position, and to connect an outlet connection of the compressed air transport device to the pneumatic bellows, also used to connect the pneumatic bellows to the suction connection of the compressed air transport device and the outlet connection of the compressed air transport device to the pressure accumulator in a second switching position in order to reduce the amount of air in the pneumatic bellows. The reversing valve can be pre-controlled with the compressed air of the pneumatic suspension system.

A pressure fluid operated ride leveler which adjusts the actual level of a vehicle body relative to a vehicle axle to a desired level, includes a pressure fluid source and a pressure fluid sink, pressure fluid chambers which support the vehicle body, and a pressure fluid conduit connecting the pressure fluid chambers to either the pressure fluid source or the pressure fluid sink. First and second controllable valve mechanisms are disposed in the pressure fluid conduit. The second valve mechanism is, e.g., a controllable throttling valve, capable of reducing the diameter of the pressure fluid conduit. Both the first and second valve mechanisms are actuated by a control unit. The control unit actuates the first valve mechanism to connect the chambers to the pressure fluid source or the pressure fluid sink based on the difference between the actual level of the vehicle body and the desired level. When the difference between the actual level and the desired level becomes less than a predetermined value, the control unit actuates the second valve mechanism, thereby reducing the diameter of the pressure fluid conduit and slowing down the delivery or withdrawal of pressure fluid. In this way, overshoot of the desired level is avoided and the number of adjustment steps is reduced.

Pressure-fluid operated ride leveler

The inventive device controls the trailing axle of a vehicle having at least two rear axles, wherein at least one rear axle is a driving axle. Pressure fluid chambers, mounted on both the driving and trailing axles, support the vehicle structure. Their pressure is varied to raise or lower the vehicle structure depending on the vehicle load and road conditions. The inventive device further comprises a first valve arrangement and a second valve arrangement. The first valve arrangement selectively connects the pressure fluid chambers of the driving axle to a compressed-air supply, to a pressure fluid sink, or isolates them. The first valve arrangement has a first and a second valve. The first valve is a 3/2-position valve actuated by a first solenoid. The second valve of the first valve arrangement is a 2/2-position valve actuated by a second solenoid. The second valve arrangement is a 3-position valve actuated by a third solenoid. The 3-position valve is controlled by cooperation of the third solenoid and a control pressure. This selectively connects the pressure fluid chambers of the trailing axle to the pressure fluid chamber of the driving axle, or to the pressure fluid sink. Alternatively, the 3-position valve isolates the trailing axle pressure fluid chambers. The control pressure is taken from the pressure fluid output of the first valve.

Device to control the trailing axle of a vehicle

A device for changing the pressure in tires of a motor vehicle. The novel device achieves that the venting of the tires can be performed independent of throttling. The device includes a tire-pressure control valve (1) with a pneumatic connection terminal (8). A control element (10) is chargeable via the pneumatic connection terminal (8). The control element (10) is formed as an actuating piston, for actuation of the valve device, comprised of valve seat (5) and closure body (6), against a restoring force, furnished by a valve spring (7), into the open position by the pressure of the compressed-air source. The device can be retrofitted into the conventional tire-pressure control device systems.

Growing community of inventors

Garbsen, Germany

Hartmut Geiger