Abstract:
Die Erfindung betrifft Feder-Dämpfer-Einrichtung für ein Kraftfahrzeug sowie ein Niveauregulierungssystem für ein Kraftfahrzeug. Die Feder-Dämpfer-Einrichtung verfügt über ein Haupthydraulikvolumen (2) und ein gegenüber dem Haupthydraulikvolumen (2) abgetrenntes, mit dem Haupthydraulikvolumen (2) zusammenwirkendes Pneumatikvolumen(3). Erfindungsgemäß ist in der Feder-Dämpfer-Einrichtung ein dezentrales Ausgleichshydraulikvolumen (11) vorhanden, wobei Hydraulikflüssigkeit vom Ausgleichshydraulikvolumen (11) in das Haupthydraulikvolumen (2) und umgekehrt zur Veränderung einer Tragkraft der Feder-Dämpfer-Einrichtung (1) und damit zur Bereitstellung einer Höhenänderung bzw. Niveauänderung für das Kraftfahrzeug umleitbar ist.
Abstract:
An apparatus and method for supporting a dynamic load relative to a foundation, such as a vehicle relative to the road, by a hydraulic system that monitors the movement of the load and adds or removes hydraulic fluid from the system to compensate for the load change. The hydraulic system is preferably one or more hydraulic cylinders that have a first chamber operably connected to the load and a second chamber operably connected to the foundation. The first and second chamber are connected by a valve. The valve is connected to the second chamber and a source of pressurized fluid with a reservoir. The first chamber senses the load change and the valve adds fluid from the pressurized fluid source to the second chamber or removes fluid from the second chamber to the reservoir to compensate for the change in the load and maintain the load in substantially the same position relative to the foundation.
Abstract:
A damper, (also called a shock absorber) is provided with the additional function of wheel bouncing so that the vehicle can be moved sideways, whilst airborne, against very little resistance. To achieve this, the damper is provided with an internal central post, (2) fixed to its base which acts as a plunger in the damper's piston rod (4) which is hollow. A high pressure hydraulic bounce fluid supply (14) is attached to the top of the bore of the piston rod which forms a bounce chamber (12). The post is hollow and has an annular space (22) around it which, together, allow damper fluid to pass between the upper (8) and lower (6) damper chambers with little restriction. A pressure sensitive valve (10) in the top of the post prevents flow through the post when the bounce chamber is not pressurised. A variable-speed bounce control valve connects the bounce chamber sequentially to an hydraulic pump and to an hydraulic reservoir to energise and exhaust the bounce chamber in order to create a repetitive wheel bounce of variable height and variable cycle time.
Abstract:
A hydropneumatic suspension, in particular for carrying the wheels of motor vehicles, has at least one damping device (1, 2) having at least one hydraulic spring strut (4), at least one hydropneumatic spring cylinder (6) and at least one damping valve (8). The spring strut (4) consists of a cylinder (10) that contains a hydraulic medium in which a piston (12) is movable to deflect and release the spring. The piston (12) separates a cylinder chamber (16) from a ring-shaped space (18) that surrounds the piston rod (14). The cylinder chamber (16) communicates through the damping valve (8) with the spring cylinder (6) to generate a spring force. The ring-shaped chamber (18) of the spring strut (4) communicates directly with the corresponding spring cylinder (6), bypassing the damping valve (8).
Abstract:
Die Erfindung betrifft einen Schwingungsdämpfer umfassend wenigstens ein Rohrelement und einen im Rohrelement in axialer Richtung verschiebbaren Kolben, eine mit dem Kolben verbundenen Kolbenstange sowie eine Dämpfkrafterzeugungseinrichtung, wobei der Kolben den Arbeitsraum im Inneren des Rohrelementes in einen ersten, kolbenstangenseitigen Arbeitsraum und einen zweiten, kolbenstangenabgewandten Arbeitsraum teilt, und wobei im oder am Kolben ein hydraulisches Übertragungsglied angeordnet ist, dessen Übertragungsverhalten von der Bewegung des Kolbens oder der Kolbenstange abhängt, wobei das hydraulische Übertragungsglied ein Ausgleichsvolumen einschließt, dadurch gekennzeichnet, dass die Größe des Ausgleichsvolumens des Übertragungsgliedes von der Ringfläche des Kolbens, die die Differenz der Querschnittsfläche des Kolbens und der Querschnittsfläche der Kolbenstange ist, abhängt.
Abstract:
A multi-point hydraulic suspension system (1) for a land vehicle has two or moreindividualhydraulic actuators (3, 5, 7). These two or more actuators (3, 5, 7) are each operatively arranged between a suspended structure and a wheeled base of the land vehicle for relative positioning one another. A common supply of pressurized fluid has a given pressure and a selectively operable pump (21) with an inlet and an outlet, for increasing the given pressure of the common supply of pressurized fluid. A fluid reservoir (35) is in selective fluid communication with the inlet of the pump. Controllable valve means (31, 33) are interposed between each of the two or more actuators and the common supply of pressurized fluid for selectively bringing each of the two or more actuators into fluid communication with the common supply of pressurized fluid in response to a control unit (41) for controlling the valve means (31, 33) and the pump (21).
Abstract:
An apparatus and method for supporting a dynamic load relative to a foundation, such as a vehicle relative to the road, by a hydraulic system that monitors the movement of the load and adds or removes hydraulic fluid from the system to compensate for the load change. The hydraulic system is preferably one or more hydraulic cylinders that have a first chamber operably connected to the load and a second chamber operably connected to the foundation. The first and second chamber are connected by a valve. The valve is connected to the second chamber and a source of pressurized fluid with a reservoir. The first chamber senses the load change and the valve adds fluid from the pressurized fluid source to the second chamber or removes fluid from the second chamber to the reservoir to compensate for the change in the load and maintain the load in substantially the same position relative to the foundation.
Abstract:
A variable hydraulic shock absorber (6) comprising a main valve (18) adapted to open and close a main passage (19) for connecting main oil chambers (7a, 7b) defined by a piston (9) in a cylinder (7); an auxiliary oil chamber (31) adapted to allow the pressure in the high-pressure main oil chamber to serve to close the main valve (18); a pilot valve (35) which is provided so that it can open and close a pilot passage (36) for connecting the auxiliary oil chamber (31) with a low-pressure side, and which is adapted to open the pilot passage (36) to discharge the working fluid from the auxiliary oil chamber (31) to the low-pressure side when the pressure in the auxiliary oil chamber (31) has exceeded a set level, whereby a closing force applied to the main valve (18) is varied; and a device (4) for variably controlling the set pressure, wherein the pilot valve (35) includes a valve disc (42) which is so designed that a pressure receiving surface and a valve seat are perpendicular to the direction of opening and closing movements of the pilot valve (35).