Base point adjustment device

Abstract

The invention relates to a base point adjustment device (10) that is intersected by a central longitudinal axis (Z), said device comprising: a first part (20) and a second part (30) which each have an opening (27, 37) in the direction of the central longitudinal axis (Z); an outwardly radial rolling bellows (40) which extends outwardly radially of a fluid volume (60) from the first part (20) to the second part (30); and an inwardly radial rolling bellows (50) which extends inwardly radially of the liquid volume (60) from the first part (20) to the second part (30), wherein the inwardly radial rolling bellows (50) forms the inwardly radial seal of the liquid volume (60).

Description

[0001] Foot point adjustment device

[0002] The invention relates to a foot point adjustment device according to claim 1.

[0003] Base adjustment devices with a central port are known from practice. These base adjustment devices can be adjusted mechanically, hydraulically, or pneumatically. One of the challenges with hydraulic or pneumatic base adjustment devices with a central port and a hydraulically or pneumatically filled actuator pressure chamber is the internal radial sealing of the pressurized actuator pressure chamber against the central port to prevent pressure losses.

[0004] For this purpose, a bellows of a pneumatically operated base point adjustment device is known from practice. Due to its geometry, the bellows cannot conform to a contour and must remain dimensionally stable even under pressure. If its folds deform under excessive pressure, the bellows cannot collapse as defined. Therefore, this solution can only be used for low air pressures. As an alternative to bellows, sliding seals or O-rings are also known from practice for inner radial sealing, particularly in hydraulic actuator concepts. These seals are also commonly used due to installation space limitations. However, sliding seals are complex, expensive to manufacture, susceptible to wear, and do not provide satisfactory sealing over their service life.The friction occurring in the seal also increases the power required for adjustment and wear.

[0005] In vehicles, the vehicle body is connected to the wheel carrier via spring struts, which are part of the wheel suspension. These spring struts, or spring-damper units, enable the vertical decoupling of the body from the wheel carrier movements. The spring struts can contain steel chassis springs, for example coil springs. Common spring struts with steel springs can include a base point adjustment device. Depending on the vehicle's loading situation, the steel chassis springs are subjected to different static loads and statically pre-compressed. This changes the distance between the wheels or the wheel carrier and the vehicle body. Various mobility concepts require that the vehicle level can be kept constant or specifically adjusted even under different loading conditions. For example, for the cooling of batteries in the underbody of electrically powered vehicles, optimized positioning relative to the airstream is required.optimal ground clearance is required. Large road irregularities can also make an increase in ground clearance advantageous. Therefore, the level control required for this is achieved by adjusting the vertical position of the upper (foot point adjustment device placed above the suspension spring) and / or lower (foot point adjustment device placed below the suspension spring) foot point of the suspension springs. The vertical position can be adjusted mechanically, for example by using a thread to vertically adjust a disc on which the spring rests and which thus defines the foot point of the coil spring. However, solutions are also known in which the foot point adjustment device can be adjusted hydraulically.

[0006] Various technical solutions for foot-point adjustment devices require a central passage. This can be necessary, for example, to guide a tubular damper through the foot-point adjustment device from the wheel carrier to the damper's body-side bearing point. However, a central passage can also be advantageous, for example, to provide a guide element within the foot-point adjustment device that allows vertical movements of the foot-point adjustment device while absorbing radial forces. In hydraulically adjustable foot-point adjustment devices, the adjustable coil spring mounts are adjusted by means of a hydraulic pressure buildup in the pressure chamber below the coil spring mount. If such foot-point adjustment devices have a central passage, this central passage runs through the pressure chamber in most technical solutions.In this case, the pressure chamber must be sealed by a central passage, usually a tubular one. Sealing rings are often used for this purpose. These seals must also allow vertical sliding in addition to their sealing function. This leads to two main disadvantages. First, internally radially sliding seals are usually used, which can be damaged by contamination or tribological wear and become leaky. Second, such seals typically have a relatively small effective area that must withstand high pressure. All components must therefore be designed accordingly.

[0007] The object of the invention is therefore to improve the prior art accordingly, in particular with regard to an improved seal of a liquid volume in a pressure chamber of a base point adjustment device.

[0008] Main features of the invention are defined in the characterizing part of claim 1. Embodiments are the subject of claims 2 to 10.

[0009] According to the invention, a base point adjustment device is proposed which is penetrated by a central longitudinal axis, comprising a first part and a second part, each of which has a passage in the direction of the central longitudinal axis, an outer radial rolling bellows which extends in the outer radial direction of a liquid volume from the first part to the second part, and an inner radial rolling bellows which extends in the inner radial direction of the liquid volume from the first part to the second part, wherein the inner radial rolling bellows forms the inner radial seal of the liquid volume.

[0010] It has been recognized that the fluid volume of a base adjustment device can be adequately sealed radially by using an inner radial rolling bellows. Therefore, the conventional seals previously arranged there, such as sliding seals or O-rings, can be omitted. The inner radial rolling bellows and / or the outer radial rolling bellows can also be referred to as a diaphragm. Such a diaphragm can, for example, comprise an elastomer matrix, which can be reinforced with a textile reinforcement, for example, intersecting thread layers.

[0011] A further advantage is its resistance to contamination. Since it doesn't require a sliding seal on a single surface, the inner radial rolling bellows can roll over contamination or damage to the surfaces without affecting its sealing performance. The inner radial rolling bellows also solves the wear problem due to its rolling properties. Because the inner radial rolling bellows contacts adjacent surfaces instead of causing friction with them, the base adjustment device is significantly improved in terms of material stress and wear.

[0012] The inner radial rolling bellows also improves the pressure condition. By utilizing the installation space around the fluid volume, the fluid pressure can be distributed over a large effective area of ​​the inner radial rolling bellows and thus kept low, compared to, for example, O-rings, where the fluid pressure acts on a very small area.

[0013] The first part can be a volume cover. The first part can axially limit the liquid volume in a first axial direction. The second part can be a volume cover. The second part can axially limit the liquid volume in a second axial direction. The first and second axial directions can run opposite to one another, starting from the liquid volume. The liquid volume can be limited by the first part in the first axial direction, by the second part in the second axial direction, by the outer radial rolling bellows in an outward radial direction, and by the inner radial rolling bellows in an inward radial direction, preferably exclusively. The liquid volume can be toroidal. The liquid volume can be filled with a liquid or can be filled with a liquid. The liquid can be an incompressible liquid. The liquid, in particular the incompressible liquid, serves to prevent the base point adjustment device from springing.The base point adjustment device is suitable for the static adjustment of a base point of a spring, for example a coil spring.

[0014] It is conceivable that one of the two parts has a spring receptacle suitable for accommodating a spring of a spring unit. It is conceivable that the other of the two parts can be connected to a vehicle, for example, to the body or wheel carrier. It is conceivable that one of the two parts has a valve for the fluid volume, for introducing or discharging a fluid into the fluid volume.

[0015] The two parts are arranged and / or designed to be movable relative to one another at least along the central longitudinal axis. One of the two parts can be movable relative to the other of the two parts and guided by a guide. They can be adjustable between an approach position and a distance position. The two parts can be arranged at a distance from one another along the central longitudinal axis. The two parts can be arranged opposite one another along the central longitudinal axis, i.e. arranged on two opposite sides of the liquid volume. The distance between the two parts can be adjusted by the fill level of the liquid volume - an increase in volume causes an increase in distance, while a decrease in volume causes a decrease in distance.The fluid that is or can be present in the liquid volume ensures that a change in volume is not caused by external forces that occur in vehicles.

[0016] The two bellows can be attached to the first part and the second part, forming a single fastening. The first bellows can be attached to the two parts separately from the second bellows, and vice versa.

[0017] The base point is the wheel carrier-side or body-side support point of a spring, particularly a coil spring. A base point adjustment device is used to adjust the distance between the wheel carrier and the wheel carrier-side support point of the spring and / or between the body and the body-side support point of the spring, regardless of the spring travel. The distance between the body and the wheel carrier can be adjusted by adjusting the base point adjustment device. While a spring is subjected to dynamic deflections during ferry operation, the adjustment travel of the base point adjustment device can remain virtually constant during ferry operation. Its adjustment travel cannot be adjusted by external stimuli from the road surface, but rather in a controlled manner and can then remain in this position.

[0018] The directions “radial”, “radial direction”, “axial” and “axial direction” refer to the central longitudinal axis.

[0019] According to a conceivable further development of the base point adjustment device, the base point adjustment device may not comprise any further sealing means between the two mutually movable parts apart from the inner radial rolling bellows in order to control the fluid volume

[0020] - inward radial and / or

[0021] - relative to an inner circumference of the movable part of the two parts and / or

[0022] - to seal against the inner circumference of the section of the multi-piece part on which the inner radial rolling bellows is arranged. The inner radial rolling bellows can therefore form the only inner radial seal of the fluid volume.

[0023] According to a further development of the base point adjustment device, it can comprise an inner wall which can be arranged radially inward of the inner radial rolling bellows, wherein the inner radial rolling bellows can be designed and / or arranged to roll against and / or bear against the inner wall. The inner wall can be a cylindrical section extending along the central longitudinal axis. The inner wall can have an outer circumferential surface on which the inner radial rolling bellows can roll and / or bear. The inner radial rolling bellows can thus transmit the fluid pressure radially inward to the inner wall and therefore does not have to withstand the fluid pressure itself. The inner radial rolling bellows can thus also transmit very high.

[0024] It is conceivable that the inner radial rolling bellows is designed and / or arranged to withstand a pressure in the liquid volume in the range of at least 0.8 MPa to 4 MPa and / or to transfer it to the inner wall. This embodiment demonstrates the advantageous interaction of the appropriate location of the inner radial rolling bellows and the inner wall. It is conceivable that the inner radial rolling bellows is designed and / or arranged to withstand a pressure peak in the liquid volume in the range of at least 4 MPa to 10 MPa and / or to transfer it to the inner wall. It is conceivable that such an inner radial rolling bellows is reinforced, for example by means of fabric layers. Although these fabric layers lead to increased stiffness, which is disadvantageous in the context of air springs and undesirable in terms of spring comfort, they are suitable for achieving pressure resistance in the present context of a base point adjustment.This design also shows the advantageous interaction of the corresponding location of the inner radial rolling bellows and the inner wall.

[0025] In this arrangement, a bellows would be particularly disadvantageous with regard to radial forces. State-of-the-art bellows must be able to absorb the pressures prevailing in the system on its own. Its folds must remain dimensionally stable so that they can fulfill their function. Otherwise, a predetermined folding and unfolding movement would no longer be possible. The inner radial rolling bellows does not need to exhibit such dimensional stability in this respect.

[0026] According to a conceivable development of the base point adjustment device, the inner radial rolling bellows can form at least one rolling fold. The at least one rolling fold can run radially inward with respect to a fastening of the inner radial rolling bellows, preferably the closer fastening, to the respective part. The rolling fold itself can then transfer the axially acting fluid pressure in the direction of the central longitudinal axis to the respective part, whereby the rolling fold itself can assume a supporting function. Such axial support is technically not possible with a sliding seal, an O-ring, or even a bellows, for example. Such a rolling fold, which can be formed by the inner radial rolling bellows, advantageously serves both to ensure the tightness and adjustability of the parts relative to one another.

[0027] According to a further development of the base-point adjustment device, the inner wall can be formed by one of the two parts. This allows the radially acting fluid pressure to be transferred to the corresponding part, eliminating the need for additional components. The base-point adjustment device can thus be pre-assembled before the spring unit is installed. Furthermore, radial installation space can be saved. The part forming the inner wall can thus form a linear guide for the other part. This eliminates the need for additional linear guides, saving installation space and reducing design complexity.

[0028] Alternatively or additionally, the inner wall can be formed by a damper tube of a damper. The damper can be enclosed by the base point adjustment device. In this case, the base point adjustment device can be a base point adjustment device arrangement. This can save radial installation space. The damper tube can extend along the central longitudinal axis into the parts of the base point adjustment device or extend through them. It is conceivable that one of the two parts is fixedly connected to the damper tube and the other of the two parts is movably mounted on the damper tube. The fixed connection can be a force-locking and / or form-locking connection. The damper tube can thus form a linear guide for the corresponding part. This makes additional linear guides unnecessary, which saves installation space and reduces design complexity.

[0029] According to a further development of the base adjustment device, it can comprise at least one axial guide ring that movably guides and / or supports one of the two parts relative to the other. This ensures secure support of the corresponding part. The axial guide ring can be arranged between the two parts or between the movably guided part and the damper tube.

[0030] According to a conceivable development of the base point adjustment device, the axial guide ring can be seal-free. It thus comprises no sealing element and is permeable to fluids, especially gases. The invention makes it possible, thanks to the inner radial seal of the liquid volume formed by the inner radial rolling bellows, to dispense with further inner radial seals. Thus, the axial guide ring can also be seal-free. This has the advantage that fluid exchange and pressure equalization between areas axially on both sides of the axial guide ring is possible, and the axial guide ring also experiences significantly less wear because it does not need to be tightly fastened. The axial guide ring is therefore not subject to wear. The lower friction also leads to improved responsiveness and lower forces when adjusting the base point adjustment device and to improved decoupling of the part connected to the axial guide ring.According to a further development of the base adjustment device, at least one of the two parts can form a bellows guide that guides the inner radial rolling bellows, preferably axially, more preferably axially and radially. The corresponding bellows guide can be a pleated guide, preferably rounded. This allows the inner radial rolling bellows to be securely guided in an approach position in which the two parts are brought closer together, and to transmit the acting fluid pressure to the parts without damage.

[0031] According to a further development of the base point adjustment device, the inner radial bellows can form only one roll fold or a first roll fold and a second roll fold. With only one roll fold, fastening the inner radial bellows is simplified, as there is more radial space for a fastening tool than with two roll folds. With two roll folds that can be axially opposite each other, the maximum possible distance between the two parts (spacing position) can be greater for the same overall height than with only one roll fold. This results in installation space efficiency.

[0032] According to a further development of the base point adjustment device, the inner radial rolling bellows can be fastened at least at one of its two axial end regions on the outer circumference side to a holding geometry of the corresponding one of the two parts, or it can be fastened on the inner circumference side to a holding geometry of the corresponding one of the two parts. In the first variant, the fastening is subjected to compressive loads. The corresponding axial end region can therefore be subjected to outward radial loads. In the second variant, the fastening is subjected to tensile loads. The corresponding axial end region can therefore be subjected to inward radial loads. The holding geometry can be an annular flange that protrudes along the central longitudinal axis.

[0033] According to a conceivable refinement of the base adjustment device, the inner radial rolling bellows can axially encompass the corresponding retaining geometry from the outer radial to the inner radial. The inner radial rolling bellows can therefore be positioned or positioned on the outer circumference, the free edge, and the inner circumference of the corresponding retaining geometry. This advantageously reduces mechanical stress and creates a self-locking effect.

[0034] According to a further development of the base point adjustment device, the inner radial rolling bellows can be attached to the two parts by means of self-locking rings or by means of force-locking rings.

[0035] According to a further development of the base adjustment device, at least one of the two parts can be constructed in multiple pieces, whereby the two rolling bellows can be attached to different parts of the multi-piece part. This simplifies pre-assembly or assembly of the parts. Furthermore, this results in cost advantages in manufacturing, since the injection molding tools can be designed to be less complex, in particular without or with less complex slides.

[0036] According to a conceivable development of the base point adjustment device, a sealing element, preferably a sealing ring, can be arranged between two adjacent pieces of the corresponding multi-piece part. The sealing element can seal the fluid volume axially in the corresponding first or second axial direction. This allows a part to be designed as a multi-piece part and also to be reliably and permanently sealed. This sealing element can be designed and / or arranged to perform a static sealing function, preferably exclusively. As a result, the sealing element is not subject to tribological wear and is therefore durable.

[0037] According to a further development of the base adjustment device, one of the two parts can engage with the other and thus be guided along the central longitudinal axis. The leading part can thus form a linear guide for the corresponding guided part. This eliminates the need for additional linear guides, saving installation space and reducing design complexity. This allows the parts to be adjusted relative to each other and independently of surrounding components.

[0038] A spring unit comprising a foot-point adjustment device according to the disclosure and a spring is also conceivable. The spring unit can optionally also comprise the damper tube. The spring can be a helical spring. If the foot-point adjustment device is arranged in series with the spring, it can serve for static level control. The features already described above with regard to the foot-point adjustment device also apply to the disclosed spring unit. The advantages already described above with regard to the foot-point adjustment device also apply analogously to the spring unit, to which reference is hereby made.

[0039] Further features, details, and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. They show:

[0040] Fig. 1 is a longitudinal sectional view of a foot point adjustment device of a first embodiment, Fig. 2 is a longitudinal sectional view of a foot point adjustment device of a second embodiment, Fig. 3 is a longitudinal sectional view of a foot point adjustment device of a third embodiment, Fig. 4 is a longitudinal sectional view of a foot point adjustment device of a fourth embodiment and Fig. 5 is a longitudinal sectional view of a foot point adjustment device of a fifth embodiment. In the figures, identical or corresponding elements are designated by the same reference numerals and will therefore not be described again unless expedient. Features already described will not be described again to avoid repetition and are applicable to all elements with identical or corresponding reference numerals, unless explicitly excluded. The disclosures contained in the entire description apply analogously to identical parts with identical reference numerals orThe same component designations are transferable. The positional information chosen in the description, such as top, bottom, side, etc., also refers to the directly described and illustrated figure and, if the position changes, must be transferred analogously to the new position. Furthermore, individual features or combinations of features from the various embodiments shown and described can represent independent, inventive, or inventive solutions in their own right.

[0041] Figure 1 shows a base adjustment device 10 suitable for use in a spring unit. The base adjustment device 10 is traversed by a central longitudinal axis Z. A circumferential direction U extends around the central longitudinal axis Z. A radial direction R extends perpendicular to it.

[0042] The foot-point adjustment device 10 comprises a first part 20 with a through-passage 27, which is depicted as a volume cover and can be connected to a vehicle. The foot-point adjustment device 10 comprises a second part 30 with a through-passage 37, which is also depicted as a volume cover and has a spring receptacle 35 suitable for receiving a spring of a spring unit, for example, a coil spring.

[0043] The two parts 20, 30 are movable relative to each other along the central longitudinal axis Z, whereby they are adjustable between an approach position and a distance position.

[0044] The first part 20 forms an inner wall 24. The inner wall 24 can be a cylindrical section extending along the central longitudinal axis Z. The inner wall 24 of the first part 20 provides the second part 30 with a guide 78 as a linear guide. The first part 20 also engages the second part 30 with the inner wall 24 along the central longitudinal axis Z. A seal-free axial guide ring 70 guides one of the parts 20, 30 to the other. The axial guide ring 70 is arranged on the inner wall 24 and, due to the absence of a seal, is permeable to fluids.

[0045] The base point adjustment device 10 additionally comprises an outer radial rolling bellows 40, which is axially fastened at one end to the first part 20 and at the other end to the second part 30. For this purpose, the axial end regions 43, 44 form fastenings 45, 46, wherein the outer radial rolling bellows 40 is fastened by force-locking rings 74. The base point adjustment device 10 further comprises an inner radial rolling bellows 50, which is also axially fastened at one end to the first part 20 and at the other end to the second part 30. The axial end regions 53, 54 of the inner radial rolling bellows 50 form fastenings 55, 56, wherein the inner radial rolling bellows 50 is fastened by force-locking rings 74. The inner radial rolling bellows 50 is fastened by its end region 54 to the inner wall 24. The two bellows 40, 50 are stretched between the parts 20, 30.

[0046] The base point adjustment device 10 also includes a toroidal fluid volume 60. The fluid volume 60 is bounded in a first axial direction A1 by the first part 20, in a second axial direction A2 by the second part 30, in an outer radial direction Ra by the outer radial rolling bellows 40, and in an inner radial direction Ri by the inner radial rolling bellows 50. The axial directions A1, A2 are opposite to each other. The radial directions Ra, Ri are opposite to each other. In the inner radial direction, the fluid volume 60 is sealed exclusively by the inner radial rolling bellows 50.

[0047] The inner radial rolling bellows 50 is designed and arranged to roll against the outer circumferential surface of the inner wall 24 and bear against it. The inner radial rolling bellows 50 also forms a rolling fold 51, which faces the second part 30. Starting from the closer attachment 55 of the inner radial rolling bellows 50, the rolling fold 51 extends radially inward. The second part 30 forms a bellows guide 31, which is a rolling fold guide for the rolling fold 51. This guides the rolling fold 51 axially and radially.

[0048] The second part 30 forms a retaining geometry 32 for the inner radial rolling bellows 50, wherein the retaining geometry 32 is designed as an annular flange 36 that protrudes along the central longitudinal axis Z. The inner radial rolling bellows 50 is fastened by its end region 53 to the outer peripheral side of the retaining geometry 32, so that the retaining geometry 32 is subjected to a compressive load. It is also evident that the inner radial rolling bellows 50 encompasses the retaining geometry 32 from the radial outside to the radial inside, starting from the attachment 55.

[0049] It can be seen that the two parts 20, 30 are arranged opposite one another along the central longitudinal axis Z and with respect to the fluid volume 60. The distance between the two parts 20, 30 can be adjusted by the fill level of the fluid volume 60, whereby an increase in the volume of the fluid volume 60 causes an increase in the distance, while a decrease in the volume of the fluid volume 60 causes a decrease in the distance. For this purpose, the first part 20 comprises a valve 23 for introducing a fluid into or discharging a fluid from the fluid volume 60. The base adjustment device can, in principle, form the body-side spring seat or the wheel carrier-side spring seat.

[0050] Figure 2 shows a foot-point adjustment device 10 according to a further embodiment. To avoid repetition, only the differences between Figure 2 and Figure 1 will be described below. Features not described shall be deemed to be disclosed and described.

[0051] The inner radial rolling bellows 50 forms a further rolling fold 52, which faces the first part 20. Starting from the closer attachment 56 of the inner radial rolling bellows 50, the rolling fold 52 extends radially inward. The first part 20 forms a bellows guide 21, which serves as a rolling fold guide for the rolling fold 52. This also guides the rolling fold 52 axially and radially.

[0052] The first part 20 forms a retaining geometry 22 for the inner radial rolling bellows 50, wherein the retaining geometry 22 is designed as an annular flange 26 that protrudes along the central longitudinal axis Z. The inner radial rolling bellows 50 is attached by its end region 54 to the outer peripheral side of the retaining geometry 22, so that it is subjected to a compressive load. It can be seen that the inner radial rolling bellows 50 encompasses the retaining geometry 22 from the radial outside to the radial inside, starting from the attachment 56.

[0053] Figure 3 shows a foot-point adjustment device 10 according to a further embodiment. To avoid repetition, only the differences between Figure 3 and Figure 1 will be described below. Features not described shall be deemed to be disclosed and described.

[0054] The inner radial rolling bellows 50 is now attached with its end region 53 to the inner circumferential side of the holding geometry 32, so that the holding geometry 32 is subjected to a tensile load. It is also evident that the inner radial rolling bellows 50 no longer encompasses the holding geometry 32 from the radial outside to the radial inside. The end region 54 of the inner radial rolling bellows 50 is now not arranged on the inner wall 24, but on a section of the first part 20 opposite in the radial direction R.

[0055] Figure 4 shows a base point adjustment device 10 according to a further embodiment. To avoid repetition, only the differences between Figure 4 and Figure 1 will be described below. Features not described shall be deemed to be disclosed and described. The second part 30 is formed in several pieces and comprises a first piece 33 and a second piece 34. The first piece 33 is arranged radially outward relative to the second piece 34. A sealing ring 76 is provided between the two pieces 33, 34 to seal the liquid volume 60 in the second axial direction A2.

[0056] The fastening 45 of the outer radial rolling bellows 40 is formed on the first piece 33, while the fastening 55 of the inner radial rolling bellows 50 is formed on the second piece 34. This significantly simplifies the assembly of both rolling bellows 40 and 50. The first piece 33 and the second piece 34 are connected to each other by means of a fastening means 23, here, for example, a screw.

[0057] Figure 5 shows a foot-point adjustment device 10 according to a further embodiment. To avoid repetition, only the differences between Figure 5 and Figure 1 will be described below. Features not described shall be deemed to be disclosed and described.

[0058] The foot-point adjustment device 10 or foot-point adjustment device assembly now comprises a damper 80 with a damper tube 82. The damper tube 82 extends along the central longitudinal axis Z through the two parts 20, 30. The first part 20 is fixedly connected to the damper tube 82, whereas the second part 30 is movable relative thereto. The axial guide ring 70 is now arranged on the damper tube 82. The damper tube 82 thus forms a linear guide for the second part 30.

[0059] An inner wall is now no longer formed by one of the two parts 20, 30. The inner wall 84 is now formed by the damper tube 82.

[0060] The inner radial rolling bellows 50 forms a further rolling fold 52, which faces the first part 20. Starting from the closer attachment 56 of the inner radial rolling bellows 50, the rolling fold 52 extends radially inward. The first part 20 forms a bellows guide 21, which serves as a rolling fold guide for the rolling fold 52. This also guides the rolling fold 52 axially and radially.

[0061] The first part 20 forms a retaining geometry 22 for the inner radial rolling bellows 50, wherein the retaining geometry 22 is designed as an annular flange 26 that protrudes along the central longitudinal axis Z. The inner radial rolling bellows 50 is attached by its end region 54 to the outer peripheral side of the retaining geometry 22, so that it experiences a compressive load. It can be seen that the inner radial rolling bellows 50 overlaps the retaining geometry 22 from the radial outside to the radial inside, starting from the attachment 56.

[0062] The invention is not limited to one of the above-described embodiments, but can be modified in a variety of ways. All features and advantages apparent from the claims, the description, and the drawings, including structural details, spatial arrangements, and method steps, may be essential to the invention both individually and in a wide variety of combinations.

[0063] The scope of the invention includes all combinations of at least two of the features disclosed in the description, the claims and / or the figures.

[0064] To avoid repetition, features disclosed by the device should also be considered as disclosed by the method and claimable. Likewise, features disclosed by the method should also be considered as disclosed by the device and claimable.

[0065] Reference symbol list

[0066] 10 spring unit

[0067] 20 first part

[0068] 21 Bellows guide

[0069] 22 Holding geometry

[0070] 23 Valve

[0071] 24 inner wall

[0072] 26 Ring flange

[0073] 27 penetration

[0074] 30 second part

[0075] 31 Bellows guide

[0076] 32 Holding geometry

[0077] 33 pieces

[0078] 34 pieces

[0079] 35 spring retainer

[0080] 36 Ring flange

[0081] 37 penetration

[0082] 38 fasteners

[0083] 40 outer radial rolling bellows

[0084] 43 End area

[0085] 44 End area

[0086] 45 Fastening

[0087] 46 Fastening

[0088] 50 inner radial rolling bellows

[0089] 51 roll fold

[0090] 52 roll pleat

[0091] 53 End area

[0092] 54 End area

[0093] 55 Fastening

[0094] 56 Fastening

[0095] 60 liquid volumes

[0096] 70 axial guide ring

[0097] 74 Force-locking ring

[0098] 76 Sealing ring

[0099] 78 leadership

[0100] 80 dampers

[0101] 82 Damper tube

[0102] 84 inner wall

[0103] A1 first axial direction

[0104] A2 second axial direction

[0105] R Radial direction

[0106] Ra outer radial direction

[0107] Ri inner radial direction

[0108] U circumferential direction

[0109] Z central longitudinal axis

Claims

Patent claims 1. Foot point adjustment device (10) through which a central longitudinal axis (Z) passes, comprising a first part (20) and a second part (30), each having a passage (27, 37) in the direction of the central longitudinal axis (Z), an outer radial rolling bellows (40) extending in the outer radial direction of a liquid volume (60) from the first part (20) to the second part (30), and an inner radial rolling bellows (50) extending in the inner radial direction of the liquid volume (60) from the first part (20) to the second part (30), characterized in that the inner radial rolling bellows (50) forms the inner radial seal of the liquid volume (60).

2. Foot point adjustment device (10) according to claim 1, characterized in that it comprises an inner wall (24, 84) which is arranged radially inwardly of the inner radial rolling bellows (50), wherein the inner radial rolling bellows (50) is designed and / or arranged to roll and / or bear against the inner wall (24, 84).

3. Foot point adjustment device (10) according to claim 2, characterized in that the inner wall (24) is formed by one of the two parts (20, 30) and / or the inner wall (84) is formed by a damper tube (82) of a damper (80).

4. Foot point adjustment device (10) according to one of the preceding claims, characterized by at least one axial guide ring (70) which guides one of the two parts (20, 30) is guided and / or supported movably relative to the other of the two parts (20, 30).

5. Foot point adjustment device (10) according to one of the preceding claims, characterized in that at least one of the two parts (20, 30) has a bellows guide (21, 31) which guides the inner radial rolling bellows (50), preferably axially.

6. Foot point adjustment device (10) according to one of the preceding claims, characterized in that the inner radial rolling bellows (50) forms only one rolling fold (51) or a first rolling fold (51) and a second rolling fold (52).

7. Foot point adjustment device (10) according to one of the preceding claims, characterized in that the inner radial rolling bellows (50) is fastened at least at one of its two axial end regions (53, 54) on the outer circumference side to a holding geometry (22, 32) of the corresponding one of the two parts (20, 30) or is fastened on the inner circumference side to a holding geometry (22, 32) of the corresponding one of the two parts (20, 30).

8. Foot point adjustment device (10) according to one of the preceding claims, characterized in that the inner radial rolling bellows (50) is fastened to the two parts (20, 30) by means of self-locking rings or by means of force-fit rings (74).

9. Foot point adjustment device (10) according to one of the preceding claims, characterized in that at least one of the two parts (20, 30) is designed in several pieces, wherein the two rolling bellows (40, 50) are fastened to different pieces (33, 34) of the multi-piece part.

10. Foot point adjustment device (10) according to one of the preceding claims, characterized in that one of the two parts (20, 30) engages in the other of the two parts (20, 30) and is thereby guided along the central longitudinal axis (Z).

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