VEHICLE WITH A CAB STORAGE SYSTEM WITH PASSIVE COMPRESSED AIR GENERATOR

Description

[0001] The invention relates to a vehicle having the features of the preamble of claim 1.

[0002] Particularly in the commercial vehicle sector, mounting systems for the spring-loaded and vibration-damped mounting of a driver's cab relative to the vehicle frame are known, serving to improve comfort during driving. The mounting system is typically implemented using air springs located between the vehicle cab and the vehicle frame. The air springs are connected to an air supply, which is generally provided by an air mass reservoir located in the vehicle. This reservoir is typically designed as a pressure accumulator and is filled with air by a compressor. A control system then supplies the air to the individual air springs. The compressor requires an electrical power source for this operation.

[0003] German patent application DE 10 2009 012581 A1 describes an active suspension system with air springs for vehicle cabins, an electric compressor, and Skyhook control. DE 10 2009 012581 A1 focuses on reducing vibrations and increasing driver comfort and uses complex control with multiple sensors. DE 10 2009 012581 A1 discloses the preamble of claim 1.

[0004] German patent application DE 10 2013 009 204 A1 describes a system for leveling the cab of a commercial vehicle relative to a vehicle chassis, as well as a corresponding operating procedure. The system comprises a spring-loaded mounting to suspend the cab on the vehicle chassis; a distance sensor configured to detect relative movements and / or the distance between the cab and the vehicle chassis; and a control device configured for variable control of the spring-loaded mounting, using signals from the distance sensor to control the mounting. The spring-loaded mounting is adjustable to a first height position, so that the distance between the cab and the vehicle chassis is controlled by the control device to a first target distance.The spring-loaded mounting is adjustable to at least a second height position, so that the distance between the driver's cab and the vehicle chassis is controlled by the control device to a second target distance, whereby the control device sets the spring-loaded mounting to the first or to at least one second height position depending on at least one parameter relating to a driving distance and / or a vehicle condition.

[0005] The invention aims to create a cabin storage system of the type mentioned above, which is characterized by low energy consumption and a cost-effective design.

[0006] This problem is solved according to the invention by a vehicle with the features of claim 1. Advantageous embodiments will become apparent from the dependent claims, the drawings and / or the description.

[0007] The invention relates to a vehicle comprising a vehicle frame and a vehicle cabin, wherein the vehicle cabin is movable relative to the vehicle frame. The vehicle cabin, also referred to as the driver's cab, is understood to be the part of the vehicle body that provides a space for the driver and, if applicable, one or more accompanying persons. The vehicle frame, also referred to as the chassis or running gear, is understood to be the part of the vehicle body that accommodates or supports the drive system, the vehicle cabin, and, if applicable, payloads.

[0008] The vehicle features a cabin mounting system, in particular a pneumatic one. Specifically, the cabin mounting system serves to dampen vibrations and / or to adjust the position of the vehicle cabin relative to the vehicle frame.

[0009] The cabin mounting system includes at least one air spring located between the vehicle frame and the cabin. The air spring's function is to influence the suspension characteristics and / or the position of the cabin relative to the vehicle frame by changing the air volume and / or mass within the air spring. In principle, the cabin can be supported on the vehicle frame solely by the at least one air spring. Alternatively, the cabin can be additionally supported or mounted on the vehicle frame by at least one damping element and / or spring element and / or bearing element. Specifically, the cabin mounting system is designed to include at least two air springs, with at least one air spring located on each side of the vehicle.The air spring is essentially formed by a rolling bellows, which is airtightly connected on one side to a receiving plate and on the other side to a rolling piston.

[0010] The cabin mounting system includes a valve unit designed and / or suitable for variably adjusting the air mass in the air spring. In principle, the valve unit is integrated into the air spring. Alternatively, however, the valve unit can also be designed as a central valve unit, which serves to variably adjust the air mass of two or more air springs. Preferably, the valve unit can increase the air mass in at least one of the air springs to raise the air spring or the vehicle cabin, or decrease the air mass to lower the air spring or the vehicle cabin. Specifically, an air mass is supplied to or discharged from the air spring via the valve unit.

[0011] The cabin mounting system includes position sensors designed and / or suitable for detecting the relative position between the vehicle cabin and the vehicle frame. In particular, the position sensors are designed to detect a distance, movement, and / or inclination of the vehicle cabin relative to the vehicle frame, especially during driving. For this purpose, the position sensors may include, for example, a displacement sensor, an inclination sensor, and / or an acceleration sensor. Preferably, the position sensors are designed to detect the absolute or relative position of the vehicle cabin.

[0012] The cabin mounting system includes a control unit designed to control the air spring's valve unit based on the detected relative and / or absolute position. Specifically, the control unit is designed as an electronic control unit (ECU). The control unit can be a vehicle control unit or at least integrated into the vehicle control unit. Alternatively, the control unit can also be a separate control unit, which is connected to the vehicle control unit, for example, via a bus system such as a CAN bus. Specifically, the control unit is designed to lower or raise the vehicle cabin or the air spring depending on the relative position and / or to increase or decrease the air mass in the air spring. Preferably, the control unit is connected to the position sensor and the valve unit via a signal connection.

[0013] Within the scope of the invention, it is proposed that the cabin mounting system comprises at least one passive compressed air generator, which is configured to supply a mass of compressed air for the at least one air spring based on a relative movement between the vehicle frame and the vehicle cabin, particularly during driving. In particular, the vehicle is designed as a vehicle without an electrically driven compressor, wherein the air mass required for the air spring is supplied exclusively or largely by the passive compressed air generator. Preferably, the compressed air generator is coupled to the vehicle frame and the vehicle cabin in such a way that the relative movement occurring during driving between the vehicle cabin and the vehicle frame can be used as an energy source to supply the air mass for at least one air spring.

[0014] A pneumatic cabin mounting system is therefore proposed, which, by utilizing kinetic energy to propel the air mass, no longer requires an active energy supply. This allows the cabin mounting system to operate particularly energy-efficiently and autonomously. A further advantage is that the passive compressed air generator can be designed much more simply and cost-effectively than a compressor typically installed in the vehicle.

[0015] In an advantageous embodiment, the compressed air generator is motion-coupled to the vehicle frame and the vehicle cabin such that, during a relative roll or pitching motion between the vehicle frame and the vehicle cabin, particularly about a longitudinal axis (x-axis) of the vehicle, the compressed air generator delivers the air mass. Alternatively or optionally, the compressed air generator is motion-coupled to the vehicle frame and the vehicle cabin such that, during a relative pitching motion between the vehicle frame and the vehicle cabin, particularly about a transverse axis (y-axis) of the vehicle, the compressed air generator delivers the air mass. For this purpose, the compressed air generator is specifically arranged off-center, particularly offset from the longitudinal axis and / or the transverse axis of the vehicle, between the vehicle cabin and the vehicle frame.Optionally, the cabin mounting system can include at least one additional compressed air generator, one for generating compressed air during relative roll movements and the other for generating compressed air during relative pitch movements. Thus, a compressed air generator is proposed that can be easily integrated between the vehicle frame and the vehicle cabin, utilizing different relative movements to generate compressed air.

[0016] In another embodiment, the compressed air generator is designed as an air pump coupled to both the vehicle frame and the vehicle cabin. Specifically, the relative motion is translated into a working motion of the air pump to move a mass of air contained within it and supply it, at least indirectly, to the air spring. For this purpose, the air spring is pneumatically connected to the air pump, particularly to at least one working chamber of the air pump. In principle, the air mass supplied by the air pump can be delivered directly or indirectly to the valve unit via an air mass reservoir, as explained in more detail below. Thus, a compressed air generator is proposed that is characterized by a particularly simple and cost-effective design and can also be easily integrated between the vehicle frame and the vehicle cabin.

[0017] In another exemplary embodiment, the compressed air generator comprises a cylinder and a piston guided within the cylinder by a piston rod, dividing the cylinder into a first and a second working chamber. In particular, the compressed air generator is designed at least as a single-acting piston air pump. Preferably, the piston rod is connected to the piston at one end and, at the other end, is optionally connected to the vehicle frame or the vehicle cabin via a connection interface. Similarly, the cylinder can be optionally connected to the vehicle cabin or the vehicle frame on a side opposite the piston rod via a further connection interface. In particular, the first working chamber is to be understood as a working chamber close to the piston rod, and the second working chamber as a working chamber farther from the piston rod.

[0018] According to this embodiment, at least one of the working chambers is connected to the environment via an inlet valve, and the other working chamber is connected to the air spring, at least indirectly, via an outlet valve. Specifically, the relative movement between the vehicle cabin and the vehicle frame is translated into a stroke of the piston, whereby the air mass is conveyed based on this stroke, particularly during the extension and / or retraction of the piston rod. In principle, the at least one inlet and outlet valve can be integrated into the cylinder. Alternatively, the at least one inlet and outlet valve can also be designed separately from the air pump and / or integrated into a flow path before or after the air pump. Thus, a passive compressed air generator is proposed, characterized by a particularly simple and robust design.

[0019] In a further embodiment, the compressed air generator is designed as a double-acting piston air pump. "Double-acting" means, in particular, that the air pump delivers the air mass during both a pulling and a pushing movement, i.e., during the extension and retraction of the piston rod. For this purpose, the compressed air generator has a first and a second inlet valve as well as a first and a second outlet valve. The first working chamber is connected to the environment via the first inlet valve and at least indirectly to the air spring via the first outlet valve. The second working chamber is connected to the environment via the second inlet valve and at least indirectly to the air spring via the second outlet valve.During a compression stroke, i.e., when the piston rod is drawn into the cylinder, air from the surroundings flows through the first inlet valve into the first working chamber. Simultaneously, the air in the second working chamber is compressed and exits through the second outlet valve as the air mass flow. During a contraction stroke, i.e., when the piston rod is extended from the cylinder, air from the surroundings flows through the second inlet valve into the second working chamber. Simultaneously, the air in the first working chamber is compressed and exits through the first outlet valve as the air mass flow. Preferably, the first and second inlet valves and / or the first and second outlet valves are designed as spring-loaded check valves that open and close automatically depending on the stroke.An air pump is therefore proposed which is characterized by a continuous supply of air mass during relative movement and can therefore be operated particularly efficiently.

[0020] In a further development, it is provided that the cabin mounting system includes an air mass storage unit designed and / or suitable for the intermediate storage of the air mass generated by the compressed air generator. Specifically, the air mass storage unit functions to store the air mass delivered and supplied by the compressed air generator and to make it available via the valve unit of the air spring. For this purpose, the air mass storage unit is fluidically positioned between the air pump and the air spring. The air mass storage unit is pneumatically connected to the compressed air generator via an inlet compressed air line and to the air spring via an outlet compressed air line. Specifically, the air mass storage unit is designed as a pressure accumulator.The air mass storage unit can, for example, be designed as a central air mass storage unit, from which one or more of the air springs can be supplied with air mass. Specifically, the air mass storage unit can be designed such that the air spring can be lifted at least once, particularly in a depressurized state. In principle, the air mass storage unit can be located anywhere in the vehicle, e.g., in the vehicle frame or the vehicle cabin. Preferably, however, the air mass storage unit is located between the vehicle frame and the vehicle cabin, particularly adjacent to the compressed air generator and / or the air spring. Thus, a cabin mounting system is proposed that is characterized by high operational reliability, whereby the air mass storage unit ensures a compressed air supply for a limited period, particularly when the vehicle is stationary.

[0021] In an advantageous implementation, the at least one outlet valve, preferably the first and / or the second outlet valve of the compressed air generator, is connected to the air mass storage unit via the inlet compressed air line. In particular, the first and second outlet valves are connected to the air mass storage unit via a common compressed air line. Alternatively, the first and second outlet valves can each be connected to the air mass storage unit via a separate compressed air line. This proposes a particularly easy-to-install cabin storage system.

[0022] In a further advantageous embodiment, the air mass storage unit is provided with a filling valve designed and / or suitable for external filling and / or pre-filling of the air mass storage unit with air mass. In particular, the filling valve serves to connect a compressed air source for supplying air mass from the outside. For example, the filling valve is designed as a spring-loaded check valve with a compressed air connection for connecting the compressed air source. In particular, if the air mass storage unit is installed inside the vehicle, the filling valve is accessible from the outside so that the air mass storage unit can be refilled with air mass as needed.

[0023] In a further embodiment, the air spring valve unit comprises an inlet valve and an outlet valve, with a control device designed to actuate the inlet valve or the outlet valve to raise or lower the air spring. In simplified terms, the inlet valve is actuated to supply air to the air spring for raising, while the outlet valve is simultaneously closed. Conversely, the outlet valve is opened to discharge air for lowering the air spring, while the inlet valve remains closed. In principle, the inlet valve and / or the outlet valve are designed as a switching valve with discrete switching states, preferably exactly two switching states. Alternatively, however, the inlet valve and / or the outlet valve can also be designed as a continuous valve, in particular a throttle valve, with continuous switching states.Preferably, the inlet and outlet valves are electrically controllable or adjustable by the control unit. For this purpose, each inlet and outlet valve can be connected to the control unit via a signal line. Thus, an air spring is proposed which is characterized by simple control and a cost-effective design.

[0024] In another embodiment, the inlet valve of the air spring is directly connected to the air reservoir via the outlet compressed air line. Specifically, each air spring has a separate inlet valve, with all inlet valves being connected to the air reservoir via the outlet compressed air line. In principle, the inlet valves can be integrated as individual valves within each air spring. Alternatively, the inlet valves can be grouped together in a valve block. Furthermore, the outlet valve of the air spring can be connected either to the air reservoir or to the environment. Thus, a cabin mounting system is proposed that is characterized by a simple connection of the air spring(s).

[0025] In a further embodiment, the cabin mounting system is provided with a pressure relief valve. Specifically, the pressure relief valve is designed to protect the air reservoir and / or the air spring from an impermissible pressure increase. For this purpose, the pressure relief valve can open at a defined set pressure, allowing the air mass to be released into the environment via the pressure relief valve until a defined closing pressure is reached. The pressure relief valve is connected between the compressed air generator and the air spring, specifically between at least one outlet valve of the compressed air generator and the inlet valve of the air spring. In particular, the pressure relief valve is optionally connected to the compressed air generator after at least one outlet valve, to the inlet compressed air line, or to the air reservoir.A cabin storage system is therefore proposed which is characterized by particularly safe operating behavior and simple monitoring of the air pressure.

[0026] Further training stipulates that the control device be designed to implement level control and / or tilt control of the vehicle cabin by controlling and / or regulating the valve unit based on the relative position. Advantageously, the control device can be designed such that it increases the distance and / or tilt or angle of the vehicle cabin relative to the vehicle frame by supplying air mass to the air spring, or decreases the distance and / or tilt or angle of the vehicle cabin relative to the vehicle frame by releasing air mass from the air spring, in order to change the level and / or tilt of the vehicle cabin relative to the vehicle frame.

[0027] In another alternative implementation, the cabin mounting system may include at least one vibration damper, which is designed and / or suitable for vibration-damped support of the vehicle cabin on the vehicle frame. The vibration damper may be a hydraulic damper or a gas pressure damper. In particular, the vibration damper is arranged between the vehicle frame and the vehicle cabin. The vibration damper is coupled to the vehicle frame on one side and to the vehicle cabin on the other. Preferably, the vibration damper is pivotably mounted on the vehicle cabin and / or the vehicle frame. In particular, at least one vibration damper may be provided for each air spring. In principle, at least one vibration damper may be arranged on each side of the vehicle.Specifically, exactly two vibration dampers and / or two air springs can be arranged on each side of the vehicle. Two vibration dampers or air springs can be located in the front section and two in the rear section of the vehicle or vehicle cabin.

[0028] In another example implementation, the compressed air generator is located at the front of the vehicle and the vibration damper at the rear. Alternatively, the at least one vibration damper can be located at the front and the at least one compressed air generator at the rear. Specifically, the at least one air spring is located between the compressed air generator and the vibration damper when viewed in the direction of travel. In particular, a vibration damper, an air spring, and a compressed air generator can be arranged on each side of the vehicle, symmetrically positioned relative to each other with respect to a longitudinal axis of the vehicle. Thus, a cabin mounting system is proposed that is characterized by vibration-damped mounting and a simple transmission of relative motion to the compressed air generator.

[0029] In a further embodiment, it is provided that the vehicle is a commercial vehicle, for example a truck, or an agricultural machine, for example a tractor, or a construction machine, for example a wheel loader.

[0030] Further features, advantages, and effects of the invention will become apparent from the following description of preferred embodiments of the invention. These will show: Figure 1 is a schematic representation of a vehicle with a cabin storage system.

[0031] Figure 1 Figure 1 shows a highly schematic representation of a vehicle 1 with a cabin mounting system 2 as an embodiment of the invention. For example, the vehicle is a commercial vehicle, e.g., a truck.

[0032] Vehicle 1 comprises a vehicle frame 3 and a vehicle cabin 4, the vehicle cabin 4 being movable relative to the vehicle frame 3. The cabin mounting system 2 ensures the relative position of the vehicle cabin 4 to the vehicle frame 3, in addition to providing driving comfort.

[0033] The cabin mounting system 2 comprises at least one controlled air spring 6 and at least one vibration damper 7, which serve to provide vibration-damping support for the vehicle cabin 4 on the vehicle frame 3. The air spring 6 and the vibration damper 7 are each arranged between the vehicle frame 3 and the vehicle cabin 4 and are coupled to the vehicle frame 3 on one side and to the vehicle cabin 4 on the other.

[0034] The air spring 6 essentially comprises a rolling diaphragm 8, a mounting plate 9, and a rolling piston 10, which are airtightly connected to one another and define an air chamber 11. The mounting plate 9 is connected to the vehicle cabin 4, and the rolling piston 10 is connected to the vehicle frame 3.

[0035] The cabin mounting system 2 has a valve unit 12, which serves to variably adjust the air mass in the air chamber 11 of the air spring 6. For this purpose, the valve unit 12 has an inlet valve 13 for supplying air mass and an outlet valve 14 for discharging air mass. For example, the inlet valve 13 and the outlet valve 14 are each designed as a switching valve with two discrete switching states, which are integrated into the rolling piston 10.

[0036] The cabin air leveling system 2 has an electronic control unit 15 for regulating and / or controlling the valve unit 12, which is connected to the inlet valve 13 and the outlet valve 14 via signal lines 16. For example, the control unit 15 is designed as a so-called electronic Cabin Air Leveling Module (eCALM).

[0037] Furthermore, the cabin mounting system 2 includes a position sensor 17, which is designed to detect the relative position between the vehicle frame 3 and the vehicle cabin 4. For example, the position sensor 17 includes at least one displacement sensor 18, which is designed to detect the relative or absolute position of the vehicle cabin 4 with respect to the vehicle frame 3. For example, the displacement sensor 18 is designed as a magnetic and / or inductive and / or optoelectronic sensor. The displacement sensor 18 is connected to the control unit 15 via a further signal line 19 in order to transmit the detected relative position or the relative or absolute position of the vehicle cabin 4 to the control unit 15.

[0038] The control unit 15 is configured to control the valve unit 12 based on the relative position, e.g., by means of an algorithm executed on the control unit 15, in order to, for example, level, lower, or raise the vehicle cabin 4 to different levels. For example, based on the relative position, it can be decided whether air mass needs to be supplied to or removed from the air spring 6, whereby the inlet valve 13 and the outlet valve 14 are controlled or regulated via the signal lines 16.

[0039] For this purpose, the air spring 6 must be supplied with air. In vehicles with an existing compressed air system, this system simply needs to be connected to the air spring 6. If such a compressed air system is not present, it must be implemented separately, requiring an active energy supply for its compressed air generation. Therefore, a compressed air system for a cabin mounting system 2 is proposed that no longer requires an active energy supply. For this purpose, the cabin mounting system 2 has a passive compressed air generator 5, which supplies air to the air spring 6 based on a relative movement between the vehicle frame 3 and the vehicle cabin 4.

[0040] According to this embodiment, the compressed air generator 5 is designed as a double-acting air piston pump, which essentially comprises a cylinder 20 and a piston 22 attached to a piston rod 21, which is guided along an inner wall within the cylinder 20. The compressed air generator 5 is arranged between the vehicle frame 3 and the vehicle cabin 4, with the cylinder 20 being kinematically coupled to the vehicle frame 3 on one side and the piston rod 21 being kinematically coupled to the vehicle cabin 4 on the other.

[0041] The piston 22 divides the cylinder 20 into a first working chamber 23 and a second working chamber 24. The two working chambers 23 and 24 are each connected via an inlet compressed air line 25 to an air mass accumulator 27, which stores the air mass generated by the compressed air generator 5 and supplies it to the air spring 6. For this purpose, the air mass accumulator 27 is connected via an outlet compressed air line 26 to the inlet valve 12 of the air spring 6.

[0042] Furthermore, the first working chamber 23 of the compressed air generator 5 is connected to the environment or atmosphere via a first inlet valve 28 and to the air mass storage tank 27 via a first outlet valve 30. The second working chamber 24 is connected to the environment or atmosphere via a second inlet valve 29 and to the air mass storage tank 27 via a second outlet valve 31. Both outlet valves 31 are connected to the air mass storage tank 27 via the inlet-side compressed air line 25.

[0043] The cabin mounting system 2 also includes a pressure relief valve 32, which ensures that excessive pressure cannot build up in the air mass reservoir 27 or that a defined operating pressure is not exceeded. In the illustration shown, the pressure relief valve 32 is connected to the inlet compressed air line 25.

[0044] The air mass storage unit 27 also has a filling valve 33, which allows the air mass storage unit 27 to be initially filled via the filling valve 33. The filling valve 33 is suitable, for example, for connecting an external compressed air source, such as a compressor, so that the air mass storage unit 27 can be pre-filled or refilled as needed.

[0045] The compressed air generator 5 is arranged between the vehicle frame 3 and the vehicle cabin 4 such that air mass is supplied both during a relative roll movement between the vehicle frame 3 and the vehicle cabin 4 about a longitudinal axis (x-axis) and during a relative pitch movement between the vehicle frame 3 and the vehicle cabin 4 about a transverse axis (y-axis). For this purpose, the compressed air generator 5 is arranged in a front area of ​​the vehicle cabin 4, offset from both the longitudinal axis (x-axis) and the transverse axis (y-axis). The vibration damper 7 is arranged in a rear area of ​​the vehicle cabin 4, with the air spring 6 positioned between the compressed air generator 5 and the vibration damper 7. For example, an air spring 6, a vibration damper 7, and a compressed air generator 5 can be arranged on each side of the vehicle in a mirror-symmetrical manner, particularly with respect to the x-axis.

[0046] During operation, the relative movements are translated into a relative stroke between cylinder 20 and piston rod 21. When the piston rod 21 retracts into cylinder 20, air mass flows into the first working chamber 23 via the first inlet valve 28. Simultaneously, the air mass in the second working chamber 24 is compressed by the piston 22 and flows out as air mass via the second exhaust valve 31 and is stored in the air mass reservoir 27. When the piston rod 21 extends from cylinder 20, air mass flows into the second working chamber 24 via the second inlet valve 29. Simultaneously, the air mass in the first working chamber 23 is compressed by the piston 22 and flows out as air mass via the first exhaust valve 30 and is stored in the air mass reservoir 27.The two inlet valves 28, 29 and the two outlet valves 30, 31 are each designed as a spring-loaded check valve, which automatically opens or closes the flow path depending on the stroke movement.

[0047] Based on the relative position, the control device is designed to implement level control or tilt control of the vehicle cabin 4 relative to the vehicle frame 3 by appropriately controlling the valve unit 12. For example, the inlet valve 13 is opened when the outlet valve 14 is closed, allowing air from the air mass reservoir 27 to flow into the air chamber 11, thereby raising the air spring 6 and / or increasing the damping force. Conversely, the outlet valve 14 is opened when the inlet valve 13 is closed, allowing air from the air chamber 11 to flow into the environment, thereby lowering the air spring 6. Reference sign

[0048] 1 Vehicle 2 Cabin mounting system 3 Vehicle frame 4 Vehicle cabin 5 Air generator 6 Air spring 7 Vibration damper 8 Rolling bellows 9 Mounting plate 10 Rolling piston 11 Air chamber 12 Valve unit 13 Inlet valve 14 Outlet valve 15 Control unit 16 Signal line 17 Position sensor 18 Position sensor 19 Additional signal line 20 Cylinder 21 Piston rod 22 Piston 23 First working chamber 24 Second working chamber 25 Inlet air line 26 Outlet air line 27 Air mass accumulator 28 First inlet valve 29 Second inlet valve 30 First outlet valve 31 Second outlet valve 32 Pressure relief valve 33 Filling valve

Claims

1. Vehicle (1), having a vehicle frame (3) and having a vehicle cab (4), which is mounted movably relative to the vehicle frame (3), having a cab mounting system (2), the cab mounting system (2) having at least one air spring (6) arranged between the vehicle frame (3) and the vehicle cab (4), wherein an air mass in the air spring (6) is variably adjustable via a valve unit (12), wherein the cab mounting system (2) has a position sensor system (17) for detecting a relative position between the vehicle cab (4) and the vehicle frame (3), and a control unit (15), the control unit (15) being designed to control the valve unit (12) of the air spring (6) on the basis of the relative position, characterized in that the cab mounting system (2) has at least one passive compressed air generator (19), which is designed to convey air mass for the air spring (6) on the basis of a relative movement between the vehicle frame (3) and the vehicle cab (4).

2. Vehicle (1) according to Claim 1, characterized in that the compressed air generator (19) is coupled in terms of movement to the vehicle frame (3) and to the vehicle cab (4) in such a way that the compressed air generator (19) conveys air mass during a relative rolling movement and / or a relative pitching movement between the vehicle frame (3) and the vehicle cab (4).

3. Vehicle (1) according to Claim 1 or 2, characterized in that the compressed air generator (19) is designed as an air pump.

4. Vehicle (1) according to any one of the preceding claims, characterized in that the compressed air generator (19) has a cylinder (20) and a piston (22) which is guided in the cylinder (20) via a piston rod (21) and divides the cylinder (20) into a first and a second working chamber (23, 24), wherein at least one of the working chambers (23, 24) is connected via an inlet valve (28, 29) to an environment and the other working chamber (23, 24) is connected via an outlet valve (30, 31) at least indirectly to the air spring (6).

5. Vehicle (1) according to Claim 4, characterized in that the compressed air generator (5) is designed as a double-acting air pump, wherein the first working chamber (23) is connected via a first inlet valve (28) to an environment and is connected via a first outlet valve (30) at least indirectly to the air spring (6), and wherein the second working chamber (24) is connected via a second inlet valve (29) to an environment and is connected via a second outlet valve (31) at least indirectly to the air spring (6).

6. Vehicle (1) according to any one of the preceding claims, characterized in that the cab mounting system (2) has an air mass accumulator (27) for temporarily storing the air mass conveyed by the compressed air generator (5), the air mass accumulator (27) being pneumatically connected via an input-side compressed air line (25) to the compressed air generator (5) and via an output-side compressed air line (26) to the air spring (6).

7. Vehicle (1) according to Claim 6, characterized in that the first and / or the second outlet valve (30, 31) of the compressed air generator (5) is / are connected via the input-side compressed air line (25) to the air mass accumulator (27).

8. Vehicle (1) according to Claim 6 or 7, characterized in that the air mass accumulator (27) has a filling valve (33) for the external filling and / or pre-filling of the air mass accumulator (27) with air mass.

9. Vehicle (1) according to any one of the preceding claims, characterized in that the valve unit (12) of the air spring has an inlet valve (13) and an outlet valve (14), wherein the control device (15) is designed to actuate the inlet valve (13) or the outlet valve (14) for raising or lowering the air spring (6).

10. Vehicle (1) according to Claim 9, characterized in that the inlet valve (13) of the air spring (6) is connected via the output-side compressed air line (26) directly to the air mass accumulator (27).

11. Vehicle (1) according to any one of the preceding claims, characterized in that the cab mounting system (2) has a pressure relief valve (32), the pressure relief valve (32) being connected between the compressed air generator (5) and the air spring (6).

12. Vehicle (1) according to any one of the preceding claims, characterized in that the control device (15) is designed to implement a level control and / or an inclination control of the vehicle cab (4) by controlling and / or regulating the valve unit (12) of the air spring (6).

13. Vehicle (1) according to any one of the preceding claims, characterized in that the cab mounting system (2) has at least one vibration damper (7) for the vibration-damped support of the vehicle cab (4) on the vehicle frame (3), the vibration damper being coupled on the one hand to the vehicle frame (3) and on the other hand to the vehicle cab (4).

14. Vehicle (1) according to Claim 11, characterized in that the compressed air generator (5) is arranged in a front region and the vibration damper (7) is arranged in a rear region, as viewed in the direction of travel.

15. Vehicle (1) according to any one of the preceding claims, characterized in that the vehicle (1) is a commercial vehicle or a construction machine or an agricultural machine.