Device and method for adjusting base point of spring element for vehicle

Abstract

The invention relates to a device and a method for adjusting a base point of a spring element for a vehicle, comprising a first wall element for connection to the vehicle and a second wall element arranged at a distance therefrom for connection to the spring element, and a chamber arranged between the first and second wall elements, the distance between the first and second wall elements is varied by varying the volume of the chamber, the chamber having an incompressible fluid, the first and / or second wall element having a through-hole for the fluid through the chamber, which through-hole can be connected in fluid communication to an input / discharge device for the fluid in order to vary the volume of the chamber, the chamber has a chamber wall having at least one third wall element extending from the first wall element up to the second wall element, the total amount of substance of which is constant as the volume of the chamber changes, the third wall element having a portion arranged in a suspended manner on a flange of the second wall element, and the third wall element having a portion arranged in a suspended manner on the flange of the second wall element when the amount of fluid in the chamber increases. The third wall piece can be tensioned between the first wall piece and the second wall piece.

Description

[0001] This application is a divisional application of the invention patent application with the original application number 202080054353.3 (international application number PCT / EP2020 / 071562) (application date: July 30, 2020, invention name: Device and method for adjusting the bottom point of a spring part for a vehicle). Technical Field

[0002] The invention relates to a device for adjusting the bottom point of a spring element for a vehicle, a system comprising the device and a method for adjusting the bottom point of a spring element for a vehicle. Background Art

[0003] In a vehicle, the body is connected to the wheel suspension via vehicle springs. This serves to drive the wheel away from the body after a collision during driving, which moves the wheel and the wheel suspension towards the body. Depending on the load state of the vehicle, the vehicle springs are compressed to varying degrees. As a result, the distance between the wheel or the wheel suspension and the body also changes. In particular, future mobility concepts require that the vehicle level can be kept constant or adjusted in a targeted manner under different load states. Therefore, an optimized positioning relative to the driving relative airflow is required for cooling of electric vehicles and for optimal ground clearance. For this purpose, a level controller is used to adjust the position of the bottom point of the vehicle springs.

[0004] For example, US Pat. No. 3,598,422 discloses a hydraulic bottom point displacement device for a vehicle bearing spring at the body-side or wheel-side connection by means of a hydraulic cylinder with a sliding seal. However, the sliding seal is complex, expensive to manufacture and the seal is susceptible to damage. The friction occurring in the seal increases the power requirement during adjustment. In particular, in the case of floating springs without integral shock absorbers, the linear guidance function must be implemented in the hydraulic cylinder, which requires additional structural height. Summary of the invention

[0005] It is therefore considered an object of the present invention to provide a device for adjusting the bottom point of a spring element for a vehicle which has a simple construction, is cost-effective and has high-speed control for driving dynamics control.

[0006] In a device for adjusting the bottom point of a spring element for a vehicle, the device comprises a first wall element for connection to the vehicle and a second wall element for connection to the spring element arranged at a distance from the first wall element, and a chamber arranged between the first wall element and the second wall element, the chamber being used to change the distance between the first wall element and the second wall element by changing the volume of the chamber, wherein the chamber contains an incompressible fluid and the first wall element and / or the second wall element has a through hole for the incompressible fluid leading directly to the chamber, wherein the through hole can be connected in a fluid-connected manner to an inlet / outlet device for the incompressible fluid in order to change the volume of the chamber, wherein the chamber has a chamber wall having at least one third wall element extending from the first wall element to the second wall element, the mass of the third wall element being constant when the volume of the chamber changes, wherein the invention provides that the third wall element has a portion which is suspended on a flange of the second wall element, wherein the third wall element can be tensioned between the first wall element and the second wall element when the amount of incompressible fluid in the chamber increases.

[0007] The core of the invention is to use a chamber whose chamber wall has a surface area that remains essentially unchanged when the volume of the chamber changes. That is, the third wall member is part of the chamber wall and extends from the first wall member to the second wall member at the same contact point before and after the volume change, without adding sections to the third wall member or removing sections from the third wall member. Therefore, the mass of the third wall member remains constant. Therefore, no sliding seal is required to achieve a change in the surface area of ​​the chamber wall when the volume of the chamber changes. In order to change the volume of the chamber, an incompressible fluid such as hydraulic oil or ethylene glycol is introduced into the chamber or discharged from the chamber via the through hole. The amount of incompressible fluid in the chamber defines the volume of the chamber. Here, when the amount of incompressible fluid in the chamber and thus the volume of the incompressible fluid changes, the surface area of ​​the surface of the incompressible fluid in the chamber remains essentially unchanged. The surface of the incompressible fluid arranged in the chamber corresponds to the surface area of ​​the chamber wall. In addition, the change in the volume of the chamber causes a change in the distance between the first wall member that can be connected to the vehicle and the second wall member that can be connected to the spring member for the vehicle (such as a vehicle spring). Here, an increase in the volume of the chamber results in an increase in the distance, while a decrease in the volume of the chamber results in a decrease in the distance. Here, the change in the volume of the chamber caused by the incompressible fluid arranged in the chamber is not caused by external forces occurring in the vehicle. The first wall element and the second wall element can also be arranged, for example, relative to each other, i.e., on opposite sides of the chamber. In this way, the position of the bottom point of the spring element of the vehicle can be changed to change the vehicle level. Since no sliding seal is required, the device is simple in structure and low in cost. In addition, high-speed control for driving dynamics control is provided by the use of an incompressible fluid, since the incompressible fluid can be introduced into or out of the chamber at high speed.

[0008] The connection with the vehicle body can also be realized by the wheel suspension. In other words, the device can be arranged between the spring element and the vehicle body or between the spring element and the wheel suspension.

[0009] According to one example, the chamber wall may include a first wall member and a second wall member.

[0010] The first wall member and the second wall member can therefore also be a part of a chamber wall. In addition, the chamber manufacturing is therefore simplified, thereby saving costs.

[0011] In another example, the third wall element has at least one deformable wall element that is flexible and tensile-resistant and extends between the first wall element and the second wall element.

[0012] By means of a deformable wall element, a chamber wall can be provided in a simple manner, the surface area of ​​which remains constant when the volume of the chamber changes when the amount of incompressible fluid in the chamber changes. The chamber wall thus has a wall element which, in conjunction with the incompressible fluid in the chamber, is rigid between the first wall element and the second wall element in the main direction of action of the chamber, but is flexible with respect to a relative displacement or tilting of the first wall element and the second wall element. As a result, forces outside the main load direction, the force action direction and the force distribution between the vehicle body and the spring element can be compensated.

[0013] According to another example, the third wall element may be connected to the first wall element and the second wall element by means of a seal, respectively.

[0014] Thus, the chamber can be produced, for example, from a plurality of wall elements connected to one another by seals. Thus, a chamber is provided which is easy to produce and has a sufficiently high tightness.

[0015] Furthermore, the at least one third wall element can, for example, comprise a fluid-tight fabric or a fabric-reinforced membrane and / or a fiber-reinforced membrane, preferably a reinforced elastomeric membrane.

[0016] The third wall element can be designed as a bellows, for example a bellows tube. Thus, a cheap deformable wall element is provided. According to another example, the chamber can have two deformable wall elements that are opposite to each other.

[0017] In this case, the chamber can be defined, for example, by means of a first wall element and a second wall element and two mutually oppositely disposed deformable wall elements. In this way, for example, a toroidal chamber can be provided, which has an opening in the center, through which, for example, a damper element can be guided. In this case, the first wall element and the second wall element can be designed, for example, in an annular shape. The damper element can then be arranged through the opening of the ring of the first wall element and the second wall element. In this way, a device can be provided with a toroidal chamber with an annular first wall element and a second wall element, which can be arranged around a damper.

[0018] Furthermore, the third wall element can have, for example, at least two wall portions, wherein the at least two wall portions are connected to one another by means of a seal.

[0019] Here, for example, one wall section can be connected to the first wall element and the other wall section can be connected to the second wall element. In this way, a chamber with a plurality of subchambers can be provided, which are defined by several wall sections. Thus, for example, the device can be provided with a greater overall height by means of standard parts for the deformable wall elements, in order to save costs.

[0020] In another example, the through hole may be closable.

[0021] Therefore, the amount of incompressible fluid in the chamber can only be changed when the through hole is opened. After the amount of incompressible fluid in the chamber has been set, the through hole can be closed, so that the incompressible fluid input / discharge device is activated only when a change in the amount of incompressible fluid in the chamber should be achieved.

[0022] According to another example, the first wall element and the second wall element may be designed as plates connected to the chamber.

[0023] This plate can be for example a baffle, and the first wall member or the second wall member can be connected to the vehicle body or the spring member by means of a fastening mechanism. This makes it easy to connect with the vehicle body or the spring member, thus reducing installation and maintenance costs.

[0024] According to another example, the device may have an axial guide mechanism, which guides the first wall member and the second wall member in the axial direction of the spring member. The axial guide mechanism prevents the first wall member and the second wall member from being radially offset from each other. It may have a centering member and a guide member. The centering member may be connected to the first wall member or the second wall member. Then, the guide member is connected to the other wall member. With the help of the axial guide mechanism, the radial force caused by the spring member is transmitted to the entire device. Therefore, the radial force not only acts on the second wall member, but the second wall member also transmits the force as a radial shear force to the third wall member. Therefore, the protection of the third wall member and the extension of its service life are achieved by the axial guide mechanism.

[0025] The axial guide can be arranged in the chamber. Here, the centering piece can be a centering pipe and the guide piece can be a guide pipe. In addition, the axial guide can have a pipeline connected to the through hole in a fluid-connected manner. Then, the centering piece or the guide piece can have another through hole connected to the pipeline in a fluid-connected manner.

[0026] In another example, the device may have at least two axial guide mechanisms.

[0027] The device can have, for example, a separate component which is connected to the second wall element and can have a receiving geometry for the spring element. For connection to the second wall element, the separate component can have a receiving geometry for the second wall element.

[0028] In addition, the axial guide mechanism can be arranged outside the chamber. Here, the axial guide mechanism can connect the first wall element to the second wall element or a separate component.

[0029] In another example, the separate component can have an outer guide for the third wall element. The outer guide can guide at least a portion of the third wall element and avoid radial displacement of the third wall element or its expansion. This prolongs the service life of the third wall element, especially when the third wall element is designed as a bellows. In addition, a thinner and softer embodiment of the third wall element can be achieved. As a result, the third wall element can be cheaper and sometimes also provide higher comfort, because it is easier to unfold, for example due to the thinner wall.

[0030] The invention also relates to a system for a vehicle spring mount, wherein the system comprises a spring element, a device according to the above description and an inlet / outlet device for an incompressible fluid, wherein a second wall element is connected to an end element of the spring and a through hole is connected to the inlet / outlet device for the incompressible fluid in a fluid-connected manner.

[0031] The advantages and effects of the system and the improvement solutions are derived from the advantages and effects of the above-mentioned device and the improvement solutions. Therefore, reference is made to the above description in this regard.

[0032] According to one example, the system further comprises a damper component, wherein the spring element and the device are arranged around at least a portion of the damper component.

[0033] Thus, an arrangement of a damper element, a spring element and a device for adjusting the bottom point of a spring element for a vehicle is provided which has a simple construction, is cost-effective and has high-speed control for driving dynamics control.

[0034] The present invention also relates to a method for adjusting the bottom point of a spring element for a vehicle by means of a device or system according to the above description, the vehicle having a body and a wheel suspension rotatably mounted on the body, the wheel suspension having a spring element and a sensor for determining the angle between the body and the wheel suspension, wherein the system or device and the spring element are arranged between the body and the wheel suspension, the method comprising the following steps: determining the actual angle between the body and the wheel suspension by means of a sensor; determining a desired angle between the body and the wheel suspension; changing the volume of a chamber by changing the amount of an incompressible fluid in the chamber to adjust the bottom point of the spring element, the chamber having a chamber wall, the chamber wall having at least one third wall element extending from a first wall element to a second wall element, the mass of the third wall element remaining unchanged when the volume of the chamber changes.

[0035] The invention thus provides a fast control method for providing driving dynamics control. After the actual angle between the vehicle body and the wheel suspension has been determined by means of sensors and a desired angle has been determined, the volume of the chamber can be changed very quickly by means of an incompressible fluid. As a result, the bottom point of the spring element can be adjusted very quickly to produce the desired angle between the vehicle body and the wheel suspension. Changes in the actual angle during driving can thus also be compensated.

[0036] Further advantages and effects as well as improvements of the method are derived from the advantages and effects as well as improvements of the above-described device. Reference is therefore made to the above description in this regard. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Further features, details and advantages of the invention emerge from the wording of the claims and from the following description of embodiments in conjunction with the accompanying drawings, in which:

[0038] Figure 1 is a schematic diagram of an apparatus for adjusting a bottom point of a spring member for a vehicle;

[0039] Figure 2a and Figure 2b is a schematic cross-sectional view of a device having different chamber internal volumes;

[0040] Figure 3 is a schematic diagram of one embodiment of the device;

[0041] Figure 4 is a schematic diagram of another embodiment of the device;

[0042] Figure 5 is a schematic diagram of another second embodiment of the device;

[0043] Figures 6a to 6e are schematic diagrams of various embodiments of the device;

[0044] Figure 7 is a schematic diagram of the system; and

[0045] Figure 8 is a flow chart of a method of adjusting a bottom point of a spring member for a vehicle.

[0046] In the following, a device for adjusting the bottom point of a spring element for a vehicle is generally denoted by the reference numeral 10 . DETAILED DESCRIPTION

[0047] The device 10 comprises a first wall member 14 for connection to a vehicle and a second wall member 16 for connection to the spring member 12. The first wall member 14 and the second wall member 16 are arranged at a distance from each other. A chamber 18 for changing the distance between the first wall member 14 and the second wall member 16 is arranged between the first wall member 14 and the second wall member 16. The chamber 18 is connected to the first wall member 14 and the second wall member 16. The chamber 18 may include the first wall member 14 and the second wall member 16, so that the first wall member 14 and the second wall member 16 may be part of the chamber 18.

[0048] Furthermore, the chamber 18 has an incompressible fluid 27. That is, the chamber 18 is filled with the incompressible fluid 27. The first wall element 14 and / or the second wall element 16 also have a through hole 20 for the incompressible fluid 27, through which the incompressible fluid 27 can be filled into the chamber 18 or discharged from the chamber 18. The through hole 20 is thus connected to the chamber 18 in a fluid-connected manner. Furthermore, the through hole 20 is designed to be connected to an inlet / discharge device 22 for the incompressible fluid 27. For this purpose, a valve 21 can be arranged at the through hole 20.

[0049] The incompressible fluid 27 may be, for example, ethylene glycol, an ethylene glycol-water mixture, brake fluid, or hydraulic steering fluid.

[0050] The change in the size of the chamber 18 between the first wall member 14 and the second wall member 16 causes a change in the distance between the first wall member 14 and the second wall member 16. The distance between the first wall member 14 and the second wall member 16 can be changed by means of the chamber 18 by feeding additional incompressible fluid 27 into the chamber 18 or by draining incompressible fluid 27 from the chamber 18. By changing the amount of incompressible fluid 27 in the chamber 18, the volume of the chamber 18 changes.

[0051] Here, Figure 2a and Figure 2b Different states of the chamber 18 or device 10 are shown. Figure 2a In the embodiment, the chamber 18 has a first volume, and Figure 2b The chamber 18 in has a second volume that is smaller than the first volume. Figure 2a and Figure 2bIn the embodiment, the chambers 18 therefore each have a different amount of incompressible fluid 27 .

[0052] Furthermore, the chamber 18 has a chamber wall 24 which delimits the chamber 18. The chamber wall 24 has at least one third wall element 25 which extends from the first wall element 14 to the second wall element 16. The third wall element 25 extends from the first wall element 14 to the second wall element 16 regardless of the volume of the chamber 18. Therefore, the mass of the third wall element 25 is constant. That is, a change in the volume of the chamber 18 does not cause a significant change in the surface area of ​​the chamber wall 24. Furthermore, in order to change the volume of the chamber 18, it is not necessary to add new wall elements that are in contact with the volume of the chamber 18 to the chamber wall (for example, as when a plunger of a hydraulic chamber is pulled out or pushed in) or to lose wall elements that are in contact with the volume or to remove such wall elements. This can also be seen from the Figure 2a and Figure 2b 2 , it can be seen that here, despite the different volumes, the third wall element 25 has the same mass and in both cases extends from the first wall element 14 to the second wall element 16 .

[0053] For this purpose, the third wall member 25 may have a flexible and tensile deformable wall member. The deformable wall member extends between the first wall member 14 and the second wall member 16. The deformable wall member forms a bellows extending between the first wall member 14 and the second wall member 16. In the following embodiments, the third wall member 25 may have a deformable wall member, respectively.

[0054] In this embodiment, the third wall element 25 has a C-shaped cross section and extends in an annular shape around a central axis (not shown). The first wall element 14 and the second wall element 16 close the opening of the ring formed by the third wall element 25. The chamber 18 is thus defined. The connection between the third wall element 25 and the first and second wall elements 16 can be achieved here by means of a seal 26.

[0055] In the first embodiment, the third wall element 25 can be a fluid-tight fabric. The fluid-tight fabric here surrounds the incompressible fluid 27 arranged in the chamber 18. The incompressible fluid 27 in the chamber 18 stabilizes the shape of the fluid-tight fabric, so that the distance between the first wall element 14 and the second wall element 16 remains constant when the volume of the chamber 18 is constant.

[0056] In another embodiment, the third wall element 25 can be a fabric-reinforced membrane and / or a fiber-reinforced membrane. It can be, for example, a reinforced elastomer membrane. When the reinforced elastomer membrane is arranged between the spring element 12 and the vehicle body 44 or the wheel suspension 46, a force acts on the elastomer membrane, which presses the first wall element and the second wall element 16 toward each other. The elastomer membrane is thereby deformed (see Figure 2b), while the surface area of ​​the elastomeric membrane does not change significantly. By inputting the incompressible fluid 27, the volume of the chamber 18 is increased and the reinforced elastomeric membrane is also deformed, wherein the entire surface area of ​​the reinforced elastomeric membrane remains constant. In addition, the reinforced elastomeric membrane is easy to produce and low in price.

[0057] Figure 3 Another embodiment of the device 10 is shown. Here, the device 10 comprises a torus-shaped chamber 18. The third wall element 25 can here have two deformable wall elements arranged opposite each other. One of the two deformable wall elements here extends along the outer radius of the torus. The other of the two deformable wall elements 25 'extends along the inner radius of the torus.

[0058] Both deformable wall elements are connected to the first wall element 14 and the second wall element 16 by means of a seal 26 .

[0059] Furthermore, the first wall element 14 and the second wall element 16 can be designed in an annular shape. The openings 28, 30 of the ring are arranged at the opening 31 of the annular surface. The damper element 42 can be guided through the openings 28, 30, 31, so that the device 10 can be arranged around the damper element 42. Likewise, the spring element 12 can thus be arranged around the damper element 42. The spring element 12, the damper element 42 and the device 10 can form a system 40 that can be designed as an assembly.

[0060] Figure 4 A further embodiment of the device 10 is shown. In this embodiment, the third wall element 25 has at least two wall parts, which are connected to each other by a seal 29 and can be a deformable wall part. Here, one wall part is connected to the first wall element 14 by a seal 26. The wall part 25" is connected to the second wall element 16 by a seal 26. The two wall parts define two subchambers 18, 18' of the chamber 18. In this way, the maximum distance between the first wall element 14 and the second wall element 16 can be enlarged by means of the known components of the third wall element 25 without the need to construct new components and with little effort.

[0061] The number of wall sections can also be selected to be greater than two in this case, in order to further increase the maximum distance between the first wall element 14 and the second wall element 16 .

[0062] Figure 5 Shows Figure 3 and Figure 4Here, the chamber 18 is designed in a toroidal shape and has two third wall members 25 opposite to each other. In this example, the two third wall members 25 each have two wall portions connected to each other by a seal 29. One of the two wall portions 25", 25"" of the third wall member 25 is connected to the first wall member 14 by a seal 26. The other of the two wall portions 25", 25"' of the third wall member 25 is connected to the second wall member 16 by a seal 26.

[0063] Figure 6a FIG. 6 c shows different embodiments of the chamber 18 and of the first and second wall elements 16 .

[0064] Figure 6a Here, a chamber 18 is shown which has a deformable wall section which is suspended on the flange of the second wall element 16. The second wall element 16 is designed in a U-shaped manner and has a receiving geometry 17 for the spring element 12. The chamber 18 is formed for the most part by the volume enclosed by the flange 13 of the second wall element 16. When the amount of incompressible fluid 27 in the chamber 18 increases, the third wall element 25 is stretched between the first wall element 14 and the second wall element 16 until the suspended part of the third wall element 25 has risen above the second wall element 16. Since the third wall element 25 is not designed to be stretchable, a maximum distance between the first wall element 14 and the second wall element 16 is obtained.

[0065] Figure 6b A further embodiment of the device 10 is shown, in which the second wall element 16 is formed by a plate in which a receiving geometry 17 for the spring element 12 is integrally formed.

[0066] 6 c shows a further embodiment of the device 10, in which the receiving geometry 17 for the spring element 12 is provided by a separate component 15, which also has partial receiving geometries for the second wall element 16 and for the third wall element 25. Furthermore, this illustration shows a fastening means 19 on the first wall element 14, by means of which the first wall element 14 can be fastened to the vehicle body 44 or the wheel suspension 46.

[0067] Figure 6d A further embodiment of the device 10 is shown. In this example, the separate component 15 has an outer guide 32 for the third wall element 25, which extends through the spring element 12. The outer guide 32 therefore has a greater supporting effect than in the embodiment according to FIG. 6 c.

[0068] This example also has an axial guide mechanism, which has a centering piece 34 and a guide piece 36. The guide piece 36 is designed to guide the centering piece 34 in the axial direction of the spring element 12. For this purpose, the centering piece 34 can be slidably connected to the guide piece 36. In addition, the centering piece 34 can be connected to the first wall element 14 or the second wall element 16. Then, the guide piece 36 is connected to the other wall element 14, 16. In this example, the axial guide mechanism is arranged in the chamber 18. The third wall element 25 extends around the axial guide mechanism. The centering piece 34 and the guide piece 36 can also form a pipeline 23 for an incompressible fluid 27, which is connected to the valve 21 in a fluid-connected manner. In this example, the valve 21 is arranged on the first wall element 14 and is connected to the pipeline 23 via a passage hole 20. The pipeline 23 has other through holes 20' and 20" on the centering piece 34, through which the incompressible fluid 27 can flow into the chamber 18.

[0069] In this example, the centering piece 34 can be a centering tube. In addition, the guide piece 36 can be a guide tube.

[0070] Figure 6e Another example of the device 10 is shown. This example can also have a separate component 15. Figure 6d In the example of the embodiment of the present invention, the device has at least two axial guides. For this purpose, the first wall element 14 is connected to the second wall element 16 or a separate component 15 outside the chamber 18 via the axial guide. In this example, the third wall element 25 does not extend around the axial guide.

[0071] In this example, the centering element 34 can also be connected to the first wall element 14 or the second wall element 16 or the separate component 15. The guide element 36 is then connected to the respective other wall element 14, 16 or the separate component.

[0072] It should be noted that the axial guide mechanism with the centering member 34 and the guide member 36 can be combined with any of the above examples. In addition, the axial guide mechanism can be used independently of the outer guide mechanism 32.

[0073] Figure 7 A system 40 is shown with a spring element 12, a damper component 42 and a device 10 for adjusting the bottom point of the spring element 12 of a vehicle. Also shown is a portion of a vehicle body 44 and a wheel suspension 46 with a sensor 48, such as a rotation angle sensor. The wheel suspension 46 is rotatably connected to the vehicle body 44 via an axle 50. The sensor 48 measures the angle between the wheel suspension 46 and the vehicle body 44 at the axle 50. The control unit 52 can also receive a signal from the sensor 48 to determine the angle between the wheel suspension 46 and the vehicle body 44.

[0074] The spring element 12 and the damper element 42 are arranged between the vehicle body 44 and the wheel suspension 46. In this case, the device 10 is arranged between the vehicle body 44 and the spring element 12 and / or between the spring element 12 and the wheel suspension 46. By means of the device 10, the distance between the wheel suspension 46 and the vehicle body 44 can be changed when the spring element 12 is compressed. In this case, the angle between the wheel suspension 46 and the vehicle body 44 will also be changed.

[0075] The distance change by means of the device 10 is achieved by feeding the incompressible fluid 27 into the device 10 or draining it out of the device 10. For this purpose, an inlet / discharge device 22 is provided, which can feed or drain the incompressible fluid 27 relative to the chamber 18 of the device 10. The inlet / discharge device 22 can be, for example, a pump for incompressible fluids. The inlet / discharge device 22 is also connected to the control unit 52, so that the control unit 52 can transmit control signals to the inlet / discharge device 22.

[0076] Here, the control unit 52 can use a method for adjusting the bottom point of the spring element 12 for the vehicle. According to the method 100, Figure 8 As shown, in a first step 102, the actual angle between the vehicle body 44 and the suspension is determined by means of the sensor 48. In a further step 104, the control unit 52 also determines the desired angle between the vehicle body 44 and the wheel suspension 46. In order to adjust the actual angle to the desired angle, the control unit 52 transmits a control signal to the input / discharge device 22, whereby in step 106 the volume of the chamber 18 is changed by changing the amount of the incompressible fluid 27 in the chamber 18. In this case, the bottom point of the spring element 12 is adjusted and moved, wherein the chamber 18 has a chamber wall 24, which has at least one third wall element 25 extending from the first wall element 14 to the second wall element 16, and the mass of the third wall element 25 remains unchanged when the volume of the chamber 18 changes.

[0077] The present invention is not limited to one of the above-described embodiments but can be modified in various ways.

[0078] All features and advantages from the claims, the description and the drawings, including constructional details, spatial arrangements and process steps, both individually and in various combinations, are essential to the invention.

Claims

1. A device for adjusting the bottom point of a spring member (12) for a vehicle, the device (10) comprising a first wall member (14) for connection to the vehicle and a second wall member (14) for connection to the spring member (12) arranged at a distance from the first wall member and a chamber (18) arranged between the first wall member (14) and the second wall member (16), wherein the distance between the first wall member (14) and the second wall member (16) is changed by changing the volume of the chamber (18), in, The chamber (18) contains an incompressible fluid (27), and the first wall element and / or the second wall element (16) has a through hole (20) for the incompressible fluid (27) directly reaching the chamber (18), wherein the through hole (20) can be connected in a fluid-communicating manner to an input / discharge device (22) for the incompressible fluid (27) to change the volume of the chamber (18), and wherein the chamber (18) has a chamber wall (24) having a through hole (20) extending from the first wall element (14) to the second wall element (16). At least one third wall member (25) extending from the first wall member (14) to the second wall member (16), the total amount of material in the third wall member being constant when the volume of the chamber (18) changes, characterized in that the third wall member (25) has a portion which is suspended on a flange (13) of the second wall member (16), wherein the third wall member (25) can be tightened between the first wall member (14) and the second wall member (16) when the amount of the incompressible fluid (27) in the chamber (18) increases.

2. The device according to claim 1, It is characterized in that The chamber wall (24) includes the first wall member (14) and the second wall member (16).

3. The device according to claim 1 or 2, It is characterized in that The third wall element (25) has at least one deformable wall element which is flexible and tensile-resistant and extends between the first wall element (14) and the second wall element (16).

4. The device according to claim 1, It is characterized in that The third wall member (25) is connected to the first wall member (14) and the second wall member (16) respectively by means of sealing members (26).

5. The device according to claim 1, It is characterized in that The third wall member (25) has a fluid-tight fabric or a fabric-reinforced membrane and / or a fiber-reinforced membrane.

6. The device according to claim 1, It is characterized in that The third wall member (25) has two deformable wall members arranged opposite to each other.

7. The device according to claim 1, It is characterized in that The third wall element (25) has at least two wall portions, wherein the at least two wall portions are connected to each other via a sealing element (26).

8. The device according to claim 1, It is characterized in that The chamber (18) is designed in the shape of a torus.

9. The device according to claim 8, It is characterized in that The first wall member (14) and the second wall member (16) are designed to be annular.

10. The device according to claim 1, It is characterized in that The through hole (20) is closable.

11. The device according to claim 1, It is characterized in that The first wall element (14) and the second wall element (16) are designed as plates connected to the chamber.

12. A system for spring-mounting a vehicle, in, The system (40) comprises a spring element (12), an inlet / outlet device (22) for an incompressible fluid (27), and a device (10) according to any one of claims 1 to 11, wherein the second wall element (16) is connected to an end element of the spring element (12) and the through hole (20) is connected to the inlet / outlet device (22) for the incompressible fluid (27) in a fluid-communicating manner.

13. The system according to claim 12, It is characterized in that The system (40) further comprises a damper element (42), wherein the spring element (12) and the device (10) are arranged at least partially around the damper element (42).

14. A method for adjusting the bottom point of a spring element for a vehicle with a body and a wheel suspension rotatably mounted on the body, the wheel suspension having a spring element and a sensor for determining the angle between the body and the wheel suspension, by means of a device according to any one of claims 1 to 11 or a system according to claim 12 or 13, in, The system or the device and the spring element are arranged between the vehicle body and the wheel suspension, and the method (100) comprises the following steps: - determining (102) the actual angle between the vehicle body and the wheel suspension by means of the sensor; - determining (104) a desired angle between the vehicle body and the wheel suspension; and -Changing (106) the volume of the chamber by changing the amount of incompressible fluid in the chamber to adjust the bottom point of the spring member, the chamber having a chamber wall, the chamber wall having at least one third wall member extending from a first wall member to a second wall member, the total amount of material in the third wall member remaining unchanged when the volume of the chamber changes.

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