Bottom point adjusting device

Abstract

The invention provides a bottom point adjusting device (10). A liquid volume (60) through which a central longitudinal axis (Z) passes and which comprises a first portion (20) and a second portion (30), respectively having perforations (27, 37) in the direction of the central longitudinal axis (Z), a radially outer diaphragm-folded balloon (40) extending from the first portion (20) to the second portion (30) radially outside the liquid volume (60), and a diaphragm-folded balloon (40) extending from the first portion (20) to the second portion (30) radially inside the liquid volume (60) a radially inner diaphragm fold bladder (50), wherein the radially inner diaphragm fold bladder (50) forms a radially inner seal of the liquid volume (60).

Description

[0001] This invention relates to a bottom point adjustment device according to claim 1.

[0002] Practice has shown that bottom point adjustment devices have a central through-hole. These devices can be adjusted mechanically, hydraulically, or pneumatically. In the case of hydraulic or pneumatic bottom point adjustment devices with a central through-hole and a hydraulically or pneumatically filled actuator pressure chamber, one challenge is sealing the pressure-bearing actuator pressure chamber relative to the radially inward side of the central through-hole to prevent pressure loss.

[0003] Therefore, practical experience has shown that a diaphragm folding airbag (Rollbalg) is positioned radially inward relative to the actuator pressure chamber in a pneumatic bottom point adjustment device. The diaphragm folding airbag, due to its geometry, does not conform to the contours and must maintain its shape under pressure. If its folds are designed to deform under excessively high pressure, the diaphragm folding airbag will not fold as intended. Therefore, this solution can only be used at low air pressures.

[0004] As an alternative to diaphragm folding airbags, sliding seals or O-rings have also been learned from practice regarding radially inward sealing, especially in hydraulic actuator concepts. This type of seal is often used due to structural space constraints. However, sliding seals are complex to manufacture, expensive, prone to wear, and do not provide satisfactory sealing performance over their service life. Friction that occurs within the seal also increases power requirements during adjustment and exacerbates wear.

[0005] In a vehicle, the body is connected to the wheel carrier via spring-damper struts, which serve as the wheel suspension. The spring-damper struts, or spring-damper units, allow for vertical decoupling of the body movement from the wheel carrier. Spring-damper struts may include chassis springs made of steel, such as coil springs. Known spring-damper struts with steel springs may include ground point adjustment devices. Depending on the vehicle load, the steel chassis springs are subjected to varying static loads and are pre-compressed statically. Therefore, the distance between the wheels or wheel carrier and the body changes. Different mobility concepts require the vehicle's level to remain constant or be intentionally adjusted under various loading conditions. For example, in the case of electric vehicles, optimal positioning relative to airflow or optimal ground clearance is required for cooling the battery within the floor. Significant road unevenness may also make increased ground clearance seem advantageous. Therefore, the desired level adjustment can be achieved by adjusting the vertical position of the upper (ground point adjustment device above the chassis spring) and / or lower (ground point adjustment device below the chassis spring) ground points. Vertical position adjustment can be achieved mechanically, for example, by using a screw thread to vertically adjust the slider against which the spring seat rests, thus limiting the bottom point of the helical spring. However, a solution is also known where the bottom point adjustment device can be adjusted using a hydraulic system.

[0006] Various technical solutions for bottom point adjustment devices require a central through-hole. This may be necessary, for example, to allow a tubular damper to pass through the bottom point adjustment device from the wheel carrier to the damper's body-side support point. However, a central through-hole may also be advantageous for, for example, for a guide that allows vertical movement of the bottom point adjustment device while withstanding radial forces, to be located within the device. In the case of a hydraulically adjustable bottom point adjustment device, the adjustable helical spring seat is adjusted by means of hydraulic pressure generated in a pressure chamber below the helical spring seat. If such a bottom point adjustment device now has a central through-hole, it passes through the pressure chamber in most technical solutions. In this case, the pressure chamber must be sealed through the mostly tubular central through-hole, often using a sealing ring that, in addition to its sealing function, must also allow vertical sliding. This leads to two disadvantages. First, the typically radially inward sliding seal can be damaged and leak due to dirt or tribological wear. Second, this seal usually has a relatively small effective area and must withstand high pressure. All components must therefore be designed accordingly.

[0007] Therefore, the objective of this invention is to improve upon existing technologies, particularly those related to improving the sealing of the liquid volume within the pressure chamber of the bottom point regulating device.

[0008] The main features of the invention are given in the characterizing portion of claim 1. The embodiments are the subject of claims 2 to 10.

[0009] According to the present invention, a bottom point adjustment device is provided, which is passed through by a central longitudinal axis and includes a first part and a second part having a through portion in the direction of the central longitudinal axis, a radially outward diaphragm folded airbag extending from the first part to the second part on the radially outer side of the liquid volume, and a radially inward diaphragm folded airbag extending from the first part to the second part on the radially inner side of the liquid volume, wherein the radially inward diaphragm folded airbag forms a radially inward seal of the liquid volume.

[0010] Knowing that the liquid volume of the bottom point regulating device can be fully sealed radially inward using a radially inward diaphragm pleated airbag, the common seals currently arranged there, such as sliding seals or O-rings, can be discarded. The radially inward diaphragm pleated airbag and / or the radially outward diaphragm pleated airbag can also be referred to as a diaphragm. Such a diaphragm can, for example, comprise an elastomeric substrate, which can be reinforced with fabric reinforcement such as cross-laid yarn layers.

[0011] Another advantage is its resistance to contamination. That is, because it does not need to slide to seal on the surface, the radially inwardly folded diaphragm airbag can roll over dirt or damage on the surface without affecting the seal.

[0012] Furthermore, the radially inward-aligned diaphragm folding airbag solves the wear problem due to its rolling characteristics. Because the radially inward-aligned diaphragm folding airbag is in contact with the adjacent surface, it replaces the friction ground that would otherwise cause friction, thus significantly improving the material stress and wear of the bottom point adjustment device.

[0013] Furthermore, the radially inward-facing diaphragm folded airbag improves the pressure state. Because the structural space around the liquid volume is utilized, the liquid pressure can be distributed over a large effective area of ​​the radially inward-facing diaphragm folded airbag and thus remain low, for example, compared to the liquid pressure acting on a very small surface of an O-ring.

[0014] The first part can be a volume cap. The first part can define the liquid volume along a first axial direction. The second part can be a volume cap. The second part can define the liquid volume along a second axial direction. The first and second axes can extend in opposite directions from the liquid volume. The liquid volume can preferably be defined only along the first axial direction by the first part, and along the second axial direction by the second part, defined radially outward by a radially outward-facing diaphragm folded airbag, and radially inward by a radially inward-facing diaphragm folded airbag. The liquid volume can be toroidal. The liquid volume can be filled or filled with liquid. The liquid can be incompressible. The liquid, especially incompressible liquid, is used to prevent the bottom point adjustment device from springing. The bottom point adjustment device is suitable for statically adjusting the bottom point of a spring such as a helical spring.

[0015] One of the two parts is conceivable to have a spring seat adapted to house the spring unit. The other of the two parts is conceivable to be connected to the vehicle, for example, on the body side or wheel carrier side. One of the two parts is conceivable to have a valve for the liquid volume to allow liquid to enter or exit the liquid volume.

[0016] Two parts are movably arranged and / or configured relative to each other, at least along a central longitudinal axis. One of the two parts can move relative to the other and is guided by a guiding mechanism. They can be adjustable between a close-up position and a spaced-out position. The two parts can be spaced apart from each other along the central longitudinal axis. The two parts can be opposite each other along the central longitudinal axis, i.e., arranged on opposite sides of the liquid volume. The distance between the two parts can be adjusted by the filling state of the liquid volume—an increase in volume causes a larger distance, while a decrease in volume causes a smaller distance. The volume change caused by the liquid present or potentially present in the liquid volume is not caused by external forces occurring in the vehicle.

[0017] The two diaphragm folding airbags can be fixed to the first and second parts respectively, forming a fixed point. The first diaphragm folding airbag can be fixed separately to the two parts from the second diaphragm folding airbag, and vice versa.

[0018] The bottom point is the support point of the spring, especially the coil spring, on the wheel carrier side or the vehicle body side. The bottom point adjustment device is used to adjust the distance between the wheel carrier and the spring support point on the wheel carrier side, and / or the distance between the vehicle body and the spring support point on the vehicle body side, regardless of spring displacement. The distance between the vehicle body and the wheel carrier can be adjusted by adjusting this bottom point adjustment device. When the spring encounters dynamic displacement during driving, the adjustment displacement of the bottom point adjustment device can remain almost constant. Its adjustment displacement cannot be adjusted by external vibrations on the road, but rather is controlled and can subsequently retain its position.

[0019] The directions “radial,” “diameter,” “axial,” and “axis direction” refer to the central longitudinal axis.

[0020] According to a conceivable improvement to the bottom point adjustment device, the bottom point adjustment device may exclude other sealing mechanisms between the two relatively movable parts, except for the radially inwardly folded diaphragm airbag.

[0021] - Radial inward, and / or

[0022] -The inner circumferential surface of the active portion relative to the two parts, and / or

[0023] -The inner circumferential surface of the part with a radially inwardly arranged diaphragm folded airbag relative to the multi-piece section.

[0024] The liquid volume is sealed. The radially inwardly folded diaphragm airbag thus forms a unique radially inward seal on the liquid volume.

[0025] According to an improved version of the bottom point adjustment device, it may include an inner wall arranged radially inward of a radially inward diaphragm folded airbag, wherein the radially inward diaphragm folded airbag can be designed and / or arranged to roll and / or abut against the inner wall. The inner wall may be a cylindrical segment extending along a central longitudinal axis. The inner wall may have an outer peripheral surface on which the radially inward diaphragm folded airbag can roll and / or abut. The radially inward diaphragm folded airbag can therefore transmit fluid pressure radially inward to the inner wall and thus does not need to bear the fluid pressure itself. Therefore, the radially inward diaphragm folded airbag can also transmit a large force.

[0026] It is conceivable that radially inwardly folded diaphragm airbags are designed and / or arranged to withstand pressure in a liquid volume residing in the range of at least 0.8 MPa to 4 MPa and / or transmitted to the inner wall. This embodiment demonstrates an advantageous fit between the corresponding positions of the radially inwardly folded diaphragm airbag and the inner wall. It is conceivable that radially inwardly folded diaphragm airbags are designed and / or arranged to withstand pressure peaks in a liquid volume residing in the range of at least 4 MPa to 10 MPa and / or transmitted to the inner wall. It is conceivable that such radially inwardly folded diaphragm airbags have reinforcing structures, such as by means of fabric layers. While fabric layers result in higher rigidity, which is disadvantageous in the context of air springs and undesirable given spring comfort, they are suitable in the current context for bottom-point adjustment to achieve pressure resistance. This embodiment also demonstrates an advantageous fit between the corresponding positions of the radially inwardly folded diaphragm airbag and the inner wall.

[0027] In particular, the diaphragm folding airbag is disadvantageous in this arrangement regarding radial forces. In the prior art, the diaphragm folding airbag must be able to withstand only the pressure present within the system. In this case, its folds must maintain shape stability so that the folds can fulfill their function. Otherwise, the intended folding and unfolding cannot be achieved. The radially inward diaphragm folding airbag must, in this respect, precisely lack this shape stability.

[0028] According to a conceivable improvement to the bottom point adjustment device, a radially inwardly folded diaphragm airbag can form at least one rolling pleat. This at least one rolling pleat can extend radially inward on its respective portion with respect to the fixing point of the radially inwardly folded diaphragm, preferably near the fixing point. The rolling pleat itself can then transmit axially acting liquid pressure toward the central longitudinal axis to its respective portion, thereby providing a support function. This axial support is technically impossible to achieve even with sliding seals, O-rings, or even folded diaphragms. This rolling pleat, which can be formed by the radially inwardly folded diaphragm airbag, advantageously serves both sealing and relative adjustability of the portion.

[0029] According to an improved version of the bottom point adjustment device, the inner wall can be formed by one of two parts. Thus, radially acting liquid pressure can be transmitted to the corresponding part, thereby rendering other components redundant. The bottom point adjustment device can thus be pre-installed itself before the spring unit is installed. Furthermore, radial structural space can be saved. The part forming the inner wall can therefore form a linear guide mechanism for the other part. This eliminates the need for other linear guide mechanisms, saving structural space and reducing structural complexity.

[0030] Alternatively or additionally, the inner wall can be formed by the damping tube of the damper. The damper can be contained within a bottom point adjustment device. In this case, the bottom point adjustment device can be a bottom point adjustment device assembly. This saves radial structural space. The damping tube can extend into or through a portion of the bottom point adjustment device along the central longitudinal axis. It is conceivable that one of the two parts is fixedly connected to the damping tube and the other of the two parts is movably mounted on the damping tube. This fixed connection can be a force-transmitting fit connection and / or an active form-fit connection. The damping tube can thus form a linear guiding mechanism for the corresponding part. This eliminates the need for other linear guiding mechanisms, saving structural space and reducing structural complexity.

[0031] According to an improved version of the bottom point adjustment device, it may include at least one axial guide ring, which actively guides and / or supports one of the two parts relative to the other. This achieves reliable support for the respective part. The axial guide ring may be arranged between the two parts or between the actively guided part and the damping tube.

[0032] According to a conceivable improvement to the bottom point adjustment device, the axial guide ring can be sealless. It therefore does not include a seal and allows liquid, especially gas, to permeate. That is, the invention allows for the abandonment of other radially inward seals due to the radially inward liquid volume seal formed by the radially inward diaphragm folded air bladder. Therefore, the axial guide ring can also be sealless. This has the advantages of enabling fluid exchange and pressure balance between the regions on both sides of the axial guide ring along the axial direction, and the axial guide ring also experiences less wear because it does not need to be tightly secured. The axial guide ring therefore experiences no wear. Less friction also leads to improved response characteristics and less force during bottom point adjustment and improved decoupling of the portion connected to the axial guide ring.

[0033] According to an improved version of the bottom point adjustment device, at least one of the two parts can form an airbag guide mechanism, which preferably guides the radially inward diaphragm folding airbag axially, more preferably axially and radially. The corresponding rolling film guide mechanism can be a rolling pleat guide mechanism, preferably rounded. Thus, the radially inward rolling film can be reliably guided in the proximity position of the two parts and the applied liquid pressure can be transmitted to the parts without damage.

[0034] According to an improved version of the bottom point adjustment device, the radially inward diaphragm folding airbag can form only one rolling fold or one first rolling fold and one second rolling fold. With only one rolling fold, fixing the radially inward diaphragm folding airbag is simplified because there is more radial space for fixing the tool than with two rolling folds. With two axially opposed rolling folds, the maximum possible distance between the two parts (interval position) can be greater at the same structural height than with only one rolling fold. Therefore, structural space efficiency is achieved.

[0035] According to an improved version of the bottom point adjustment device, the radially inwardly folded diaphragm airbag can be fixed at least at one of its two axial end regions on the outer peripheral side to the retaining geometry of the corresponding portion of the two parts, or on the inner peripheral side to the retaining geometry of the corresponding portion of the two parts. In a first variation, the fixing point bears a compressive load. The corresponding axial end region can therefore bear a radially outward load. In a second variation, the fixing point bears a tensile load. The corresponding axial end region can therefore bear a radially inward load. The retaining geometry can be an annular flange projecting along the central longitudinal axis.

[0036] According to a conceivable improvement to the bottom point adjustment device, the radially inward diaphragm folded airbag can axially clamp the corresponding retaining geometry from the radially outer to the radially inner side. The radially inward diaphragm folded airbag can therefore be abutted or positioned against or positioned on the corresponding retaining geometry's outer peripheral surface, free edge, and inner peripheral surface. This advantageously results in a reduction of mechanical load and creates self-locking.

[0037] According to an improved version of the bottom point adjustment device, the radially inward diaphragm folding airbag can be fixed to the two parts by means of a self-locking ring or by means of a force-transmitting shape-fitting ring.

[0038] According to an improved version of the bottom point adjustment device, at least one of the two parts can be designed as a multi-piece unit, wherein the two diaphragm folded airbags can be fixed to different parts of the multi-piece unit. This simplifies the pre-installation or installation of the parts. Furthermore, this results in manufacturing cost advantages because the injection mold can be designed to be less complex, especially with little or no complex sliders.

[0039] According to a conceivable improvement to the bottom point adjustment device, a seal, preferably a sealing ring, can be provided between two adjacent parts of the corresponding multi-piece section. The seal can axially seal the liquid volume in the corresponding first or second axis. This allows a section to be designed as multi-piece and reliably and permanently sealed. The seal can be designed and / or arranged to preferably perform only a static sealing function. Thus, the seal does not experience tribological wear and correspondingly has a long service life.

[0040] According to an improved version of the bottom point adjustment device, one of the two parts can be inserted into the other and thus guided along the central longitudinal axis. The guiding part can therefore form a linear guiding mechanism for the corresponding guided part. This eliminates the need for other linear guiding mechanisms, saving structural space and reducing structural complexity. Thus, the parts can be guided to move relative to each other and independently of the surrounding members.

[0041] Another conceivable element is a spring unit, comprising the bottom adjustment device and spring as described herein. The spring unit may also include a damping tube. The spring may be a helical spring. If the bottom adjustment device and spring are arranged in series, it can be used for static leveling. The features already described above regarding the bottom adjustment device also appear to be applicable to the spring unit disclosed herein. The advantages already described above regarding the bottom adjustment device similarly apply to the spring unit, which is referred to herein.

[0042] Other features, details, and advantages of the invention are derived from the wording of the claims and the following description of embodiments in conjunction with the figures, wherein:

[0043] Figure 1 A longitudinal cross-sectional view of the bottom point adjustment device according to the first embodiment is shown.

[0044] Figure 2 A longitudinal cross-sectional view of the bottom point adjustment device according to the second embodiment is shown.

[0045] Figure 3 A longitudinal cross-sectional view of the bottom point adjustment device according to the third embodiment is shown.

[0046] Figure 4 A longitudinal cross-sectional view of the bottom point adjustment device according to the fourth embodiment is shown, and

[0047] Figure 5 A longitudinal cross-sectional view of the bottom point adjustment device according to the fifth embodiment is shown.

[0048] In the figures, identical or corresponding components are labeled with the same reference numerals and are therefore not described repeatedly unless it is inappropriate. Features that have already been described are not redescribed to avoid duplication and may be used for components with the same or corresponding reference numerals unless explicitly excluded. The disclosure contained in all descriptions is applicable, according to its meaning, to the same components with the same reference numerals or the same component names. The location descriptions selected in the specification, such as above, below, side, etc., also relate to the figures immediately described and shown, and are applied to new locations according to their meaning when the location changes. Furthermore, individual features or combinations of features from the different embodiments shown and described may also be independent, inventive, or solutions according to the invention.

[0049] Figure 1A bottom point adjustment device 10 is shown, which is suitable for use in a spring unit. The bottom point adjustment device 10 is traversed by a central longitudinal axis Z. A circumferential U extends around the central longitudinal axis Z. A radial R extends perpendicularly to it.

[0050] The bottom point adjustment device 10 includes a first portion 20 with a through portion 27, which is shown as a volume cover and is connectable to a vehicle. The bottom point adjustment device 10 includes a second portion 30 with a through portion 37, which is also shown as a volume cover and has a spring seat 35 adapted to accommodate a spring unit such as a coil spring.

[0051] The two parts 20 and 30 move relative to each other along the central longitudinal axis Z, and they can be adjusted between close and spaced positions.

[0052] The first portion 20 forms an inner wall 24. The inner wall 24 may be a cylindrical segment extending along a central longitudinal axis Z. The inner wall 24 of the first portion 20 provides a guide mechanism 78, in the form of a linear guide mechanism, to the second portion 30. Furthermore, the first portion 20 is inserted into the second portion 30 with its inner wall 24 along the central longitudinal axis Z. An unsealed axial guide ring 70 guides one of the portions 20, 30 relative to the other portion. The axial guide ring 70 is positioned on the inner wall 24 and allows fluid to pass through due to the lack of a seal.

[0053] Furthermore, the bottom point adjustment device 10 includes a radially outward diaphragm folded airbag 40, which is fixed at one axial end to the first portion 20 and at the other axial end to the second portion 30. For this purpose, the axial end regions 43 and 44 form fixing portions 45 and 46, wherein the radially outward diaphragm folded airbag 40 is fixed by means of a force-transmitting shape-fitting ring 74. The bottom point adjustment device 10 also includes a radially inward diaphragm folded airbag 50, which is also fixed at one axial end to the first portion 20 and at the other axial end to the second portion 30. The axial end regions 53 and 54 of the radially inward diaphragm folded airbag 50 form fixing portions 55 and 56 for this purpose, wherein the radially inward diaphragm folded airbag 50 is fixed by means of a force-transmitting shape-fitting ring 74. The radially inward diaphragm folded airbag 50 is fixed to the inner wall 24 with its end region 54. The two diaphragm folded airbags 40 and 50 are inflated between the two portions 20 and 30.

[0054] The bottom point adjustment device 10 also includes a toroidal liquid volume 60. The liquid volume 60 is defined by a first portion 20 along a first axial direction A1, by a second portion 30 along a second axial direction A2, and is defined radially outward Ra by a radially outwardly oriented diaphragm folded air bladder 40, and radially inward Ri by a radially inwardly oriented diaphragm folded air bladder 50. Axial directions A1 and A2 extend in opposite directions. Radial directions Ra and Ri extend in opposite directions. In the radially inward direction, the liquid volume 60 is sealed only by the radially inwardly oriented diaphragm folded air bladder 50.

[0055] The radially inwardly folded diaphragm airbag 50 is designed and arranged to roll and abut against the outer peripheral surface of the inner wall 24. Furthermore, the radially inwardly folded diaphragm airbag 50 forms rolling pleats 51 facing the second portion 30. Starting from the proximal fixing portion 55 of the radially inwardly folded diaphragm airbag 50, the rolling pleats 51 extend radially inward. The second portion 30 forms an airbag guide mechanism 31, which is a rolling pleat guide mechanism for the rolling pleats 51. Thus, the rolling pleats 51 are also guided axially and radially.

[0056] The second part 30 forms a retaining geometry 32 for the radially inwardly folded diaphragm airbag 50, wherein the retaining geometry 32 is designed as an annular flange 36 protruding along the central longitudinal axis Z. The radially inwardly folded diaphragm airbag 50 is fixed to the outer periphery of the retaining geometry 32 with its end region 53, thereby retaining the geometry 32 under pressure loads. It can also be seen that the radially inwardly folded diaphragm airbag 50 overlaps the retaining geometry 32 from the radially outer side to the radially inner side starting from the fixing part 55.

[0057] Two sections 20 and 30 are positioned opposite each other along the central longitudinal axis Z and about the liquid volume 60. The distance between the two sections 20 and 30 can be adjusted by the filling state of the liquid volume 60, where increasing the volume of the liquid volume 60 increases the distance, and decreasing the volume of the liquid volume 60 decreases the distance. The first section 20 includes a valve 23 for introducing liquid into or discharging liquid from the liquid volume 60.

[0058] The bottom point adjustment device can, in principle, form a spring seat on the vehicle body side or a spring seat on the wheel frame side.

[0059] Figure 2 A bottom point adjustment device 10 according to another design is shown. To avoid repetition, only the following description should be provided. Figure 2 and Figure 1 The difference lies in the fact that undescribed features should be treated as if they were publicly disclosed and described.

[0060] The radially inwardly folded diaphragm airbag 50 forms another rolling pleat 52, which faces the first portion 20. Starting from the fixing portion 56 near the radially inwardly folded diaphragm airbag 50, the rolling pleat 52 extends radially inward. The first portion 20 forms an airbag guide mechanism 21, which is a rolling pleat guide mechanism for the rolling pleat 52. Thus, the rolling pleat 52 is also guided axially and radially.

[0061] The first part 20 forms a retaining geometry 22 for the radially inward diaphragm folded airbag 50, wherein the retaining geometry 22 is designed as an annular flange 26 protruding along the central longitudinal axis Z. The radially inward diaphragm folded airbag 50 is secured to the outer periphery of the retaining geometry 22 with its end region 54, so that it is subjected to pressure load. It can be seen that the radially inward diaphragm folded airbag 50 overlaps the retaining geometry 22 from the radially outer side to the radially inner side starting from the fixing part 56.

[0062] Figure 3 A bottom point adjustment device 10 according to another design is shown. To avoid repetition, only the following description should be provided. Figure 3 and Figure 1 The difference lies in the fact that undescribed features should be treated as if they were publicly disclosed and described.

[0063] The radially inwardly folded diaphragm airbag 50 is now secured to the inner circumferential side of the retaining geometry 32 with its end region 53, so that the retaining geometry 32 is subjected to tensile loads. It can also be seen that the radially inwardly folded diaphragm airbag 50 no longer overlaps the retaining geometry 32 from the radially outer to the radially inner side. The end region 54 of the radially inwardly folded diaphragm airbag 50 is now not positioned on the inner wall 24, but on the radially R-opposite portion of the first part 20.

[0064] Figure 4 A bottom point adjustment device 10 according to another design is shown. To avoid repetition, only the following description should be provided. Figure 4 and Figure 1 The difference lies in the fact that undescribed features should be treated as if they were publicly disclosed and described.

[0065] The second part 30 is designed as a multi-piece unit and includes a first part 33 and a second part 34. The first part 33 is arranged radially outward relative to the second part 34. A sealing ring 76 is provided between the two parts 33 and 34 to seal the liquid volume 60 in the second axial direction A2.

[0066] The fixing portion 45 of the radially outward diaphragm folding airbag 40 is formed on the first part 33, while the fixing portion 55 of the radially inward diaphragm folding airbag 50 is formed on the second part 34. This makes the installation of the two diaphragm folding airbags 40 and 50 much easier. The first part 33 and the second part 34 are connected to each other by means of a fastener 38, for example, a screw.

[0067] Figure 5 A bottom point adjustment device 10 according to another design is shown. To avoid repetition, the following should only describe... Figure 5 In and Figure 1 The difference is that undescribed features should be treated as if they were publicly disclosed and described.

[0068] The bottom point adjustment device 10 or bottom point adjustment device assembly now includes a damper 80 with a damping tube 82. The damping tube 82 extends along the central longitudinal axis Z through two sections 20, 30. The first section 20 is fixedly connected to the damping tube 82, while the second section 30 is movable relative to it. An axial guide ring 70 is now mounted on the damping tube 82. The damping tube 82 thus forms a linear guide mechanism for the second section 30.

[0069] The inner wall is no longer formed by one of the two parts 20 and 30. The inner wall 84 is now formed by the damping tube 82.

[0070] The radially inwardly folded diaphragm airbag 50 forms another rolling pleat 52, which faces the first portion 20. The rolling pleat 52 extends radially inward from the fixing portion 56 near the radially inwardly folded diaphragm airbag 50. The first portion 20 forms an airbag guide mechanism 21, which is a rolling pleat guide mechanism for the rolling pleat 52. This also guides the rolling pleat 52 axially and radially.

[0071] The first part 20 forms a retaining geometry 22 for the radially inward diaphragm folded airbag 50, wherein the retaining geometry 22 is designed as an annular flange 26 protruding along the central longitudinal axis Z. The radially inward diaphragm folded airbag 50 is secured to the outer periphery of the retaining geometry 22 with its end region 54, thus encountering pressure loads. It can be seen that the radially inward diaphragm folded airbag 50 overlaps the retaining geometry 22 from the radially outer side to the radially inner side starting from the fixing part 56.

[0072] This invention is not limited to one of the foregoing embodiments, but can be modified in a variety of ways. All features and advantages derived from the claims, specification, and figures, including structural details, spatial arrangements, and method steps, are important to the invention not only individually but also in various different combinations.

[0073] All combinations of at least two features disclosed in the specification, claims and / or figures fall within the scope of this invention.

[0074] To avoid duplication, features disclosed regarding the apparatus should also be considered as disclosed and claimable regarding the method. Similarly, features disclosed regarding the method should also be considered as disclosed and claimable regarding the apparatus.

[0075] List of reference numerals

[0076] 10 Spring Units

[0077] 20 Part 1

[0078] 21. Airbag guiding mechanism

[0079] 22. Maintain geometry

[0080] 23 valves

[0081] 24 Inner Wall

[0082] 26. Annular flange

[0083] 27. Penetrating section

[0084] 30 Part Two

[0085] 31 Airbag guiding mechanism

[0086] 32. Maintain geometry

[0087] 33 parts

[0088] 34 parts

[0089] 35 Spring seat

[0090] 36. Annular flange

[0091] 37 Penetrating section

[0092] 38 Fasteners

[0093] 40 radially outward-facing diaphragm folded airbags

[0094] 43 End region

[0095] 44 End Region

[0096] 45 Fixing part

[0097] 46 Fixing part

[0098] 50 radially inward diaphragm folding airbag

[0099] 51 Rolling pleats

[0100] 52 Rolling pleats

[0101] 53 End region

[0102] 54 End Region

[0103] 55 Fixing part

[0104] 56 Fixing part

[0105] 60 Liquid volume

[0106] 70 Axial Guide Ring

[0107] 74 Force transmission shape matching ring

[0108] 76 Sealing ring

[0109] 78 Guiding Mechanism

[0110] 80 damper

[0111] 82 Damping tube

[0112] 84 Inner Wall

[0113] A1 First Axial Direction

[0114] A2 Second Axis

[0115] R radial

[0116] Ra radially outward direction

[0117] Ri radially inward direction

[0118] U Zhou Xiang

[0119] Z-center longitudinal axis

Claims

1. A nadir adjustment device (10) which is penetrated by a central longitudinal axis (Z) and comprises a first part (20) and a second part (30) each having a through- going portion (27, 37) in the direction of the central longitudinal axis (Z), a radially outer bellows (40) extending from the first part (20) to the second part (30) radially outside a liquid volume (60), and a radially inner bellows (50) extending from the first part (20) to the second part (30) radially inside the liquid volume (60), characterized in that, The radially inner film-folded airbag (50) forms a radially inner seal of the liquid volume (60).

2. The nadir adjustment device (10) according to claim 1, characterized in that The nadir adjustment device (10) comprises an inner wall (24, 84) which is arranged radially inside the radially inner film-folded airbag (50), wherein the radially inner film-folded airbag (50) is designed and / or arranged to roll and / or to lie against at the inner wall (24, 84).

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

4. Nadir adjustment device (10) according to any one of the preceding claims, characterized in that There is provided at least one axial guide ring (70) which actively guides and / or supports one of the two parts (20, 30) relative to the other.

5. Nadir adjustment device (10) according to any one of the preceding claims, characterized in that At least one of the two parts (20, 30) forms an airbag guide (21, 31) which preferably guides the radially inner film-folded airbag (50) in axial direction.

6. Nadir adjustment device (10) according to any one of the preceding claims, characterized in that The radially inner film-folded airbag (50) forms only one rolling fold (51) or one first rolling fold (51) and one second rolling fold (52).

7. Nadir adjustment device (10) according to any one of the preceding claims, characterized in that The radially inner film-folded airbag (50) is fixed at least at one of its two axial end regions (53, 54) on a holding geometry (22, 32) of the respective one of the two parts (20, 30) on the outer circumferential side or on the inner circumferential side.

8. Nadir adjustment device (10) according to any one of the preceding claims, characterized in that The radially inner film-folded airbag (50) is fixed on the two parts (20, 30) by means of a self-locking ring or by means of a force-transmitting form-fit ring (74).

9. Nadir adjustment device (10) according to any one of the preceding claims, characterized in that At least one of the two parts (20, 30) is designed in multiple pieces, wherein the two film-folded airbags (40, 50) are fixed on different pieces (33, 34) of this multiple-piece part.

10. Nadir adjustment device (10) according to any one of the preceding claims, characterized in that One of the two parts (20, 30) is inserted into the other one of the two parts (20, 30) and is guided thereby along the central longitudinal axis (Z).

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