Shock absorber with line block

Abstract

The invention relates to a vibration damper having a line block which closes an outer container tube on the end side and is connected to the container tube via a first connecting surface, a cylinder being arranged inside the container tube and having two working chambers hydraulically separated by a piston on an axially movable piston rod, the working chamber remote from the piston rod is coupled to the line block via a first fluid connection, in which the intermediate tube surrounding the cylinder forms a second fluid connection, which is coupled to the annular chamber of the line block, in which the annular wall of the line block separates the first fluid connection from the second fluid connection, the container tube, the intermediate tube and the cylinder are supported on the line block, and the intermediate tube is operatively connected to an adapter element which eliminates a cross-sectional difference between a line section of the second fluid connection and a coupling on the line block.

Description

Technical Field

[0001] The invention relates to a vibration damper having a line block according to the preamble of claim 1 . Background Art

[0002] Patent document DE 10 2021 212 966 A1 discloses a shock absorber which has a line block at one end, which closes an outer container tube and has a connection for a mechanical connection, for example to an axle. The line block is used to connect the working chamber inside the shock absorber to at least one adjustable damping valve and, if necessary, to further hydraulic connections, for example for an external hydraulic supply.

[0003] Some advantages, such as miniaturization of the structural space for the numerous channels between the working chamber and the connection or in terms of compressive strength, are inseparable from the robust construction of the manifold block. On the other hand, the production of channels and functional surfaces on and in the manifold block requires extensive machining.

[0004] Furthermore, suitable manifold blocks have been previously produced for shock absorbers of the same functional type but with different cylinder diameters, which results in standard sizes that require the use of more complex blank production concepts, which are uneconomical.

[0005] The manifold blocks known from the prior art have connection surfaces for the outer container tube, the intermediate tube and the cylinder. An increase in the diameter of the cylinder also results in an increase in the diameter of the intermediate tube. Therefore, additional constraints must be taken into account when designing the manifold blocks. Summary of the invention

[0006] The object of the present invention is to solve the problem of the diversity of components in a pipeline block known in the prior art.

[0007] This object is achieved in that the intermediate pipe is operatively connected to an adapter element which eliminates the difference in cross section between the line section of the second fluid connection and the connection on the line block.

[0008] The adapter element enables the use of a uniform line block for various structural sizes of the vibration damper. Another positive effect is the installation space advantage of the radial extension.

[0009] In a first embodiment, the adapter element is formed by a longitudinal section of the intermediate pipe, which longitudinal section comprises a radial shoulder and a guide section. The size of the radial shoulder is determined by the outer diameter of the intermediate pipe and the diameter of the connection on the line block.

[0010] In another embodiment, the adapter element is formed by an adapter ring which is independent of the intermediate tube and the manifold block. This makes it possible to minimize deformations of the intermediate tube. The intermediate tube can also be designed as a simple tube with a constant cross section. This also simplifies the assembly of the shock absorber by making it possible to use the larger cross section of the intermediate tube for inserting the cylinder and then placing the adapter ring on the intermediate tube.

[0011] Optionally, the adapter ring can engage in an annular chamber of the line block. This simplifies the hydraulic separation of the fluid lines in the central tube from the annular compensating space surrounding the central tube.

[0012] In a further advantageous embodiment, the adapter ring is axially supported on a second annular wall of the manifold block. The contact between the adapter ring and the annular wall ensures a hydraulic seal.

[0013] According to an advantageous dependent claim, the adapter ring has at least one L-shaped section which comprises an axial support surface for the intermediate pipe and a radial support surface for the support function on the manifold block.

[0014] Another measure for optimizing the space of the manifold block is that the cylinder is supported on the manifold block via a tapering ring. Additional assembly advantages are achieved by making the adapter element a component of the tapering ring.

[0015] With a view to standardizing manifold blocks for use in different structural sizes of vibration dampers, the manifold blocks have at least two stepped centering surfaces for tank tubes with different inner diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The invention is explained in more detail with reference to the following description of the figures.

[0017] The accompanying drawings show:

[0018] Figure 1 is a cross-sectional view of a shock absorber according to the prior art;

[0019] Figures 2 to 4 is and according to Figure 1 The structural principle of the shock absorber and the cut-out sections of the shock absorber with different structural sizes;

[0020] Figure 5 and Figure 6 is based on Figure 1 Illustration of the vibration damper shown with the adapter ring;

[0021] Figure 7 is an illustration of an alternative embodiment of the adapter ring;

[0022] Figure 8 It is an adapter ring and a reducer ring combined into an assembly. DETAILED DESCRIPTION

[0023] Figure 1 The longitudinal section of the shock absorber 1 is shown with a cylinder 3, in which an axially displaceable piston rod 5 with a piston 7 is guided. Fluid can flow through the piston 7 from both sides via damping valves 9, 11, and the piston divides the cylinder 3 into a working chamber 13 on the piston rod side and a working chamber 15 remote from the piston rod. Both working chambers are completely filled with hydraulic damping medium.

[0024] The working chamber 13 on the piston rod side is closed at the end by a piston rod guide 17. At the other end of the cylinder 3, a manifold block 19 is arranged in series with the cylinder 3, and a hopper-shaped tapered element 21 is arranged between the cylinder 3 and the manifold block 19. The tapered element 21 forms an annular bottom for the working chamber 15 remote from the piston rod, which has a first fluid connection 23 to an adjustable damping valve device 25. In this variant, the tapered element 21 is formed by a component separate from the manifold block 19, so that the manufacturability of the manifold block 19 is particularly simplified, and is supported on a first annular wall 22 surrounding the fluid connection 23.

[0025] The piston rod-side working chamber 13 is connected to the second damping valve device 29 via a second fluid connection 27. The second fluid connection 27 is connected to the piston rod-side working chamber 13 via a connection opening 31, which is located inside the piston rod guide 17 or in the area of ​​the cylinder 3 that is not passed by the piston 7.

[0026] The cylinder 3 is surrounded by a central tube 33 which is positioned radially on the cylinder 3 with a connection region 35 . The annular space between the central tube 33 and the outer side of the cylinder 3 forms the longest section of the second fluid connection 27 .

[0027] At the other end of the intermediate pipe, the intermediate pipe is centered and held by the nipple of the pipeline block 19 ( Figures 2 to 4 ). Therefore, the socket 37 forms a second annular wall opposite to the annular wall 22 on the first fluid connection part 23.

[0028] The cylinder 3 and the intermediate tube 33 are in turn surrounded by an outer container tube 41. The container tube 41 extends at least from the outer end face 43 of the piston rod guide 17 to a centering shoulder 45 as a connection face of the manifold block 19. The manifold block 19 thus forms an end-side closure of the entire shock absorber 1.

[0029] The annular space between the intermediate tube 33 and the inner wall of the container tube 41 forms a compensation chamber 47 which is only partially filled with damping medium and compensates for the volume of damping medium displaced by the piston rod 5 from the working chambers 13, 15 of the cylinder 3. The two adjustable damping valve devices 25, 29 are connected to the common compensation chamber 47 in the outflow direction.

[0030] The second fluid connection 27 in the central pipe 33 is likewise connected to the manifold block 19, and the two fluid connections 23, 27 have separate radial channels 49, 51 in the manifold block 19, which are each connected to an inlet opening (not shown) of the damping valve device 25, 29. For the design and function of the two structurally identical damping valve devices 25, 29, see, for example, patent document DE 10 2013 218 658 A1.

[0031] The longitudinal section 57 of the second fluid connection 27 extends within the manifold block 19. The tapered element 21 separates an annular chamber 59 in the second fluid connection 27 in the region of the end face 61 of the manifold block 19 from the working chamber 15 remote from the piston rod. The annular chamber 59 forms a radial transition between the region of the outer side of the cylinder 3 and the axial longitudinal section 57 of the second fluid connection 27 within the manifold block 19, within the second fluid connection 27. The radial channel 51 of the damping valve device 29 for the working chamber 13 on the piston rod side is connected to this axial longitudinal section 57.

[0032] The longitudinal section 63 of the first fluid connection 23 extends concentrically within the pipeline block 19 ( Figure 2 ). The longitudinal section 63 receives the tapered element 21 and has a radial channel 49 connected to a coupling nipple 65, which leads to the damping valve device 25 for the working chamber 15 remote from the piston rod. The two radial channels 49, 51 have an axial overlap, wherein the two damping valve devices 25, 29 in this specific embodiment also have the same axial distance from the end face 67 of the manifold block 19. Due to the annular chamber 59, the longitudinal section 57 can be displaced radially inwards relative to the longitudinal section 63, whereby the distance of the coupling nipples 65, 69 for the two damping valve devices 25, 29 can also be minimized.

[0033] The line block 19 has a circumferential annular web 53 as part of a centering shoulder. The annular web 53 overlaps axially with the container pipe 41. The outer housing 55 of the damping valve device 25, 29 is connected to the line block 19 in a pressure-tight manner in the region of the annular web 53 by means of a weld seam 71. Furthermore, all axial channels 63, 57 open into the end face 61 of the line block 19. The end face 61 delimits a compensation chamber 47 in a radially outer region between the connection region 39 for connecting the intermediate pipe 33 at the socket 37 as a second annular wall. The connection region 39 for the intermediate pipe 33 at the socket 37 of the line block 19 is designed to be axially offset (axially offset) relative to the second annular web 53 in the direction of the radial channels 49, 51. Figure 2 ).

[0034] The receiving chambers 73 , 75 for the two damping valve devices 25 , 29 thus intersect the end region of the compensation chamber 47 . As a result, overflow channels 77 , 79 are formed between the compensation chamber 47 and the damping valve devices 25 , 29 .

[0035] Optionally, a hydraulic system is connected to the line block 19 , which system pumps damping medium into the two working chambers 13 , 15 by means of a pump (not shown).

[0036] Figures 2 to 4 Limited to Figure 1 The figure shows a part of a shock absorber of the structural form. The adjustable damping valve device is not shown. In addition, the check valve assemblies 81, 83 respectively provided for the two damping valve devices 25, 29 are shown. Each check valve assembly 81, 83 is arranged in hydraulic series with the corresponding damping valve device 25, 29. This structural design is known, for example, from patent document DE 102019 215 984A1. Figures 2 to 4 In all the figures of FIG. 1 , pipeline blocks 19 are shown with the same geometrical dimensions. Figure 2 The embodiment of FIG. 1 shows a shock absorber 1 with a minimum diameter with respect to the cylinder 3, the intermediate tube 33 and the container tube 41, which is also as Figure 1 As shown. Figure 3 and Figure 4 In the case of a truncated concrete structure, members with larger cross-sections are used.

[0037] In order to be able to use standardized manifold blocks 19 , the intermediate pipe 33 has an adapter element 85 which eliminates the cross-sectional difference between the line section 57 of the second fluid connection 27 and the nipple 37 on the manifold block 19 . The taper 21 must also be adjusted to the larger diameter of the cylinder 3 . Figure 3 and Figure 4 The smaller taper angle in the figure shows the changed dimensions while the basic structure of the tapered element 21 remains the same.

[0038] exist Figure 3 and Figure 4 In the embodiment, the adapter element 85 is formed by a longitudinal section of the intermediate tube 33, which includes a radial shoulder 87 and a guide section 89. Figure 4 As shown, the inner diameter of the guide section 89 can be smaller than the outer diameter of the cylinder 3. During assembly, the intermediate pipe 33 is first connected to the pipeline block 19, and then the cylinder 3 is pushed into the intermediate pipe 33. In this case, the tapered piece 21 can be connected to the intermediate pipe 33 or connected to the pipeline block 19, for example by means of a press fit.

[0039] Figures 5 to 7An embodiment of the invention is shown in which the adapter element 85 is formed by an adapter ring which is independent of the intermediate pipe 33 and the manifold block 19. The adapter ring 85 has at least one L-shaped section with support surfaces 91, 93. By dimensioning the radial extension of the adapter ring 85, a transition between the intermediate pipe 33 and the manifold block 19 is formed. The intermediate pipe 33 is designed in such a way that it has no special contour in the direction of the adapter ring 85, that is, a constant cross section of the cylindrical blank for the intermediate pipe 33 can be maintained. The intermediate pipe 33 is centered on the adapter ring 85 by means of a first support surface 91, and a second support surface 95 serves to center the adapter ring on the manifold block 19. In this embodiment, the support surface 95 bears against the socket 37, i.e. the second annular wall, of the manifold block 19.

[0040] Figure 7 The embodiment shown is intended to show that the adapter ring 85 can also be engaged in the annular chamber 59 of the pipeline block 19 and can therefore bear on the inside with its second radial support surface 97 against the second annular wall 37 of the pipeline block 19. Therefore, the end surface 99 of the second annular wall 37 on the pipeline block 19 serves as a support surface for the adapter ring and the intermediate pipe 33, thereby providing a larger flow cross section between the compensation chamber 47 and the non-return valve assemblies 81, 83.

[0041] according to Figure 8 The variant shown shows a combination of an adapter element 85 and a tapered ring 21, wherein the cylinder 3 is as shown in FIG. Figures 1 to 7 The adapter element 85 is supported on the pipeline block 19 via the tapered ring 21, but the adapter element 85 is an integral part of the tapered ring 21. This further simplifies the assembly work, because there is no need to assemble two parts, but only the tapered ring 21. In order to complete the design, Figure 8 It is also shown in FIG. 1 that a seal 101 independent of the second annular wall 37 of the manifold block 19 may be used.

[0042] In order to make it easy to combine container tubes 41 with different inner diameters with the standardized manifold block 19, the manifold block 19 has at least two stepped centering surfaces 45A, 45B. In this case, the container tube 41 does not necessarily have to rest axially on the shoulder, but can rest axially on the manifold block 19 as shown and be welded there.

[0043] List of reference numerals:

[0044] 1 Shock absorber

[0045] 3 Cylinder

[0046] 5 Piston rod

[0047] 7 Piston

[0048] 9 Damping valve

[0049] 11 Damping valve

[0050] 13 Working chamber on the piston rod side

[0051] 15 Working chamber away from piston rod

[0052] 17 Piston rod guide

[0053] 19 Pipeline Block

[0054] 21 Tapered

[0055] 22 First annular wall

[0056] 23 first fluid connection

[0057] 25 Adjustable damping valve device

[0058] 27 Second fluid connection

[0059] 29 Adjustable second damping valve device

[0060] 31 Connection opening

[0061] 33 Intermediate pipe

[0062] 35 Connection area of ​​the intermediate pipe on the cylinder block

[0063] 37 Second annular wall (connecting sleeve)

[0064] 39 Connection area

[0065] 41 Container tube

[0066] 43 outer end face

[0067] 45 Centering shoulder

[0068] 45A Centering shoulder

[0069] 45B Centering shoulder

[0070] 47 Compensation chamber

[0071] 49 Radial channel

[0072] 51 Radial channel

[0073] 53 Ring joint

[0074] 55 Housing of damping valve assembly

[0075] 57 longitudinal sections

[0076] 59 Ring Chamber

[0077] 61 End face

[0078] 63 Longitudinal section of the first fluid connection

[0079] 65 Connecting socket

[0080] 67 End face of pipeline block

[0081] 69 Connecting socket

[0082] 71 Weld

[0083] 73 Chamber

[0084] 75 Holding Chamber

[0085] 77 Overflow channel

[0086] 79 Overflow channel

[0087] 81 Check valve assembly

[0088] 83 Check valve assembly

[0089] 85 Adapter element

[0090] 87 Radial shoulder

[0091] 89 Guide section

[0092] 91 Support surface

[0093] 93 Support surface

[0094] 95 Support surface

[0095] 97 Support surface

[0096] 99 End face

[0097] 101 Seals.

Claims

1. A vibration damper (1) having a manifold block (19) which closes an outer container tube (41) at the end and is connected to the container tube (41) via a first connection surface (45), wherein: A cylinder (3) is arranged inside the container tube (41), the cylinder having two working chambers (13, 15) separated hydraulically by a piston (7) on an axially movable piston rod (5), wherein the working chamber (15) remote from the piston rod is connected to the pipeline block (19) via a first fluid connection (23), wherein an intermediate pipe (33) surrounding the cylinder (3) forms a second fluid connection (27), which is connected to an annular chamber (59) of the pipeline block (19), wherein the ... In the embodiment of the present invention, the annular wall (22) of the pipeline block (19) separates the first fluid connection part (23) from the second fluid connection part (27), and the container pipe (41), the intermediate pipe (33) and the cylinder body (3) are supported on the pipeline block (19), characterized in that the intermediate pipe (33) is effectively connected to an adapter element (85), and the adapter element eliminates the cross-sectional difference between the pipeline section of the second fluid connection part (27) and the connecting part (37) on the pipeline block (19).

2. The vibration absorber (1) according to claim 1, characterized in that The adapter element (85) is formed by a longitudinal section of the central tube (33), which comprises a radial shoulder (87) and a guide section (89).

3. The vibration absorber (1) according to claim 1, characterized in that The adapter element (85) is formed by an adapter ring which is independent from the intermediate pipe (33) and the manifold block (19).

4. The vibration absorber (1) according to claim 3, characterized in that The adapter ring (85) engages in the annular chamber (59) of the manifold block (19).

5. The vibration absorber (1) according to claim 3 or 4, characterized in that The adapter ring (85) is axially supported on a second annular wall (37) of the manifold block (19).

6. The vibration absorber (1) according to at least one of claims 3 to 5, characterized in that The adapter ring (85) has at least one L-shaped section, which includes an axial support surface (91) and a radial support surface (93).

7. The vibration absorber (1) according to at least one of claims 3 to 6, characterized in that The cylinder (3) is supported on the manifold block (19) via a tapered ring (21), wherein the adapter element (85) is a component of the tapered ring (21).

8. The vibration absorber (1) according to at least one of claims 1 to 7, characterized in that The manifold block (19) has at least two stepped centering surfaces (45A, 45B) for container tubes (41) with different inner diameters.

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