Damping valve for shock absorber

Abstract

The invention relates to a damping valve for a vibration damper, comprising a damping valve body having at least one flow channel, the outlet side of which is at least partially covered by at least one valve disk, the at least one valve disc is lifted from the valve seat surface of the damping valve body under the impact of the flow via the flow channel, and the support disc resists a further lifting movement, at least one elastomer element axially penetrates through the support disc and rests on the support disc with an end-side retaining head, at least the connecting part between the retaining head and the supporting disc is provided with a deformation protection structure aiming at the retaining head at least in the radial direction.

Description

Technical Field

[0001] The present invention relates to a damping valve for a shock absorber as described in the preamble of claim 1 of the patent. Background Art

[0002] A damping valve for a shock absorber is known from the patent document DE 10 2016 218 375 A1, in which a support disk bears a plurality of elastomeric elements that generate a force acting in the closing direction of the valve disk. Here, the elastomeric elements penetrate the support disk.

[0003] The patent document DE 10 2019 218 021 A1 discloses elastomeric elements in the shape of rivet elements. The earlier patent document DE 10 2023 210 857 A1 also relates to a general damping valve, where the retaining head here has a structure for more targeted adjustment of the support force.

[0004] The shape of the retaining head is crucial for the function of the damping valve in terms of diameter, height, and cross-sectional profile. When a very soft valve disk is combined with a smaller retaining head diameter and retaining head height, the elastomeric elements may come out of the valve disk. Summary of the Invention

[0005] The object of the present invention is to solve the problems known in the prior art.

[0006] This object is achieved in that the connection between at least one retaining head and the support disk has a deformation protection structure for the retaining head, at least in the radial direction.

[0007] Thereby, the pushing phenomenon of the retaining head in the direction of the receiving opening for the elastomeric elements in the support disk is prevented.

[0008] In a first embodiment, the deformation protection structure is formed by an adhesive layer between the retaining head and the support disk. The adhesive layer prevents relative movement between the more or less elastic support disk and the elastomeric elements.

[0009] Another configuration is characterized in that the support disk has a surface structure at least in the contact area in contact with the retaining head. This surface structure forms a form-fit connection between the support disk and the retaining head.

[0010] In another advantageous design, the surface structure is formed by at least one stamping. The stamping can be carried out very simply and precisely defined in a plane.

[0011] Thus, in the region of the receiving opening for the elastomeric element in the support disk, the stamping can be configured as a corrugated structure. The corrugated structure is particularly advantageous when the mounting orientation of the support disk is arbitrary, i.e., when there is no distinction between a top side and a bottom side.

[0012] It can also be provided that the stamping is configured as at least a segmented groove. The elastomeric element is subjected to an axial preloading force and is thus fitted in the groove. Even a very small groove depth can prevent the retaining head from undergoing lateral displacement relative to the receiving opening in the support disk.

[0013] Furthermore, the stamping can also be configured as a material accumulation in the contact region. Here, a slight increase in the material thickness is sufficient to form a radial stop for the retaining head.

[0014] If a particularly soft and elastic support disk is required, the surface structure is configured along the circumferential direction of the support disk.

[0015] The technical problem can also be solved by utilizing the structure of the receiving opening in the support disk. The elastomeric element has a connecting web between the retaining head and the deformation region, wherein the cross-section of the connecting web has a greater elongation in the circumferential direction of the support disk than in the radial direction. Thereby, a greater protrusion is produced at the retaining head along the radial direction with respect to the support disk compared to the connecting web.

[0016] As an alternative or supplement to the above solution, the support disk can also have a reinforcement region for the at least one elastomeric element. Although the support disk will continue to deform, which will cause a lift stroke, the deformation of the support disk is restricted to the region of the retaining head, so that the negative effects of the relative movement between the support disk and the retaining head during the deformation of the support disk will not occur. Description of the Drawings

[0017] The present invention will be explained in more detail with reference to the following description of the drawings.

[0018] In which the drawings show:

[0019] Figure 1 is a cross-sectional view of the shock absorber in the region of the damping valve;

[0020] Figure 2 is according to Figure 1 the exploded view of the damping valve shown;

[0021] Figures 3 to 6 is a diagram showing a variant for connecting the elastomeric element / valve disk according to Figure 1 shown;

[0022] Figure 7 is a top view of the valve disk. Detailed implementation manner

[0023] Figure 1 Fig. shows a cross-sectional view of the shock absorber 1 in the region of the damping valve 3. In this embodiment, the damping valve 3 is the bottom valve in a twin-tube shock absorber, but the present invention is not limited to such a spatial or functional design.

[0024] The shock absorber 1 includes a working cylinder 5, which is filled with a damping medium. In this working cylinder, a plunger (not shown) on the piston rod discharges the damping medium through the damping valve 3 into a compensation space 7. The annular compensation space 7 is defined on the outside by a container tube 9 and on the inside by the working cylinder 5. The end-side bottom 11 closes the compensation space 7 and, if necessary, also bears the exemplary joint mechanism 13 shown. In addition, the bottom 11 supports the damping valve body 15 of the damping valve 3.

[0025] The damping valve body 15 includes at least one flow passage 17, but preferably includes a first group of flow passages, which are used to realize the flow-through from the working space 19 in the working cylinder to the compensation space 7 when the plunger moves into the working space 19. The at least one flow passage 17 is at least substantially closed by at least one valve disk 21, in this case a valve disk group.

[0026] At least one flow passage 23 is arranged on a larger pitch circle of the damping valve body 15. When the plunger is withdrawn from the working cylinder 5, the damping medium flows through the flow passage in the flow direction from the compensation space 7 towards the working space 19 in the working cylinder 5. At the outlet side of the flow passage 23, at least one valve disk 25 is also placed flat on the valve seat surface of the damping valve body 15. The valve disk 25 is equipped with a support disk 27 that resists the lifting movement of the valve disk 25. In this case, the support disk is configured as an elastic disk. The support disk 27 has a receiving opening 29 for an elastomeric element 31. The elastomeric element axially passes through the support disk 27 and a retaining head 35 is placed on the back side 33 facing away from the valve disk 25. Generally speaking, the pressure difference borne by the flow passage 17 and at least one valve disk 21 in the pressure damping valve is greater than the pressure difference borne by the valve disk 25 and the flow passage 23.

[0027] Combined with Figure 2 It can be clearly seen that a connecting element 37 (in this case a fastening rivet) penetrates the damping valve body 15. The riveting head 39 of the fastening rivet 37 is used to tension the valve disk group 21 on the annular tensioning surface 40 of the damping valve body 15 against the flow-through direction of the damping medium into the compensation space 7 ( Figure 1 ).

[0028] On the opposite cover side of the damper body 15, the outer valve seat surface 41 and the inner valve seat surface 43 define an annular groove 45, which forms the outlet side of the flow passage 23 for the flow direction of the damping medium from the compensation space 7 into the working space 19 of the working cylinder 5. The shape of the valve seat surface is also only regarded as exemplary. Annular valve seat surfaces can also be provided around each flow passage 23.

[0029] If required, a pre-throttling ring 47 can be placed on the cover side, which causes a first pressure drop in the inflow direction of the flow passage 17. The support surface 49 of the damper body 15 for the pre-throttling ring 47 is arranged deeper axially in the damper body 15 than the two raised valve seat surfaces 41; 43 for the valve disk 25.

[0030] Both the valve disk 25 and the support disk 27 have star-shaped notched centering structures 51; 53, and the notches allow the damping medium to enter the flow passage 17. The support disk 27 and the valve disk 25 preferably have the same centering diameter 55. Both the valve disk 25 and the support disk 27 are centered at the cylindrical region 57 of the elastic seat element 59, where the suspended support disk 27 is supported on the support surface 61 due to the axial pre-tension force of the elastomeric element 31.

[0031] The cylindrical region 57 of the elastic seat element 59 is axially superimposed on the valve seat surfaces 41; 43 for the valve disk 25, and at the same time tensions the pre-throttling ring 47 on the support surface 49 of the damper body 15. The upset head 65 of the connecting element 37 ensures the pre-tension force of the elastic seat element 59 with the cylindrical region 57. As can be seen from Figure 1 it, there is a free space 63 between the support disk 27 and the valve disk 25 in the inner diameter region, so that the support disk 27 can move towards the valve disk 25 against the pre-tension force of the elastomeric element 31.

[0032] In the lifting movement of the valve disk 25 from the valve seat surface 41, the valve disk 25 starts to bend at the edge side and is simultaneously supported on the elastomeric element 31. The elastically supported support disk 27 is also bent and is simultaneously supported on the elastic seat element 59 on the inner side. The bending of the support disk 27 causes a relative movement between the retaining heads 35 on the back side 33 of the support disk 27, and this relative movement may cause a reduction in the retaining force of the retaining heads 35. According to the invention, at least the connection between the retaining heads 35 and the support disk 27 has a deformation protection structure for the retaining heads 35 at least in the radial direction. In accordance with Figure 3In the embodiment shown, the deformation protection structure is formed by an adhesive layer 67 between the holding head 35 and the support disk 27. The adhesive layer 67 can be limited to an annular contact area 69 between the holding head 35 and the support disk 27. However, for manufacturing reasons, it may be simpler to provide the adhesive layer 67 on the entire back side 33 of the support disk 27 or on the entire surface of the support disk 27.

[0033] according to Figures 4 to 6 The embodiment shown comprises a support disk 27 which, at least in the contact region 69 with the holding head 35, has a surface structure 71 based on a stamping. Figure 4 In the embodiment, by punching in the region of the receiving opening 29, a material accumulation 73 is produced in the contact region 69 between the holding head 35 and the support disk 27. The material accumulation 73 does not need to have any particular dimensional or geometric accuracy. Figure 4 7 , a web-shaped cross section is shown as a material accumulation 73 by way of example. The web-shaped cross section is not necessarily uniform over the entire circumference. They serve as form-fitting elements for the retaining head 35.

[0034] Alternatively, in the region of the receiving opening 29 for the elastomeric element in the support disk 27, the embossing can be designed as a wave-shaped structure and extend simultaneously in two directions, such as Figure 5 shown.

[0035] In accordance with Figure 6 In the illustrated support disk 27 , the punched portion is configured as an at least segment-shaped recess 75 . The recess 75 is configured relatively close to the receiving opening 29 and therefore does not affect the strength of the support disk 27 .

[0036] The surface structure 71 is preferably formed in the circumferential direction and thus transversely to the curvature of the support disk 27 .

[0037] Figures 1 to 6 The elastomeric element is shown to have a connecting web 77 between the retaining head 35 and the deformation region 79. Figure 7 2 shows a top view of the support disk 27. It can be seen that, as an alternative measure, the cross section of the connecting web 77 has a greater extension in the circumferential direction of the support disk 27 than in the radial direction. As a result, the radial overlap in the contact area 69 is increased.

[0038] exist Figure 7 The knurling is shown in A flat surface structure 71 of the pattern is provided which is limited to the contact area with the holding head 35 .

[0039] Alternatively, or also in combination with the measures already described, the support disk 27 can have a reinforcement area 81 for at least one elastomeric element 31. For example, Figure 7 Two radially extending beads (Sicke) in the support disk 27 are shown, which partially reinforce the support disk 27 in the region of the retaining head 35 and thus prevent any relative movement between the support disk 27 and the retaining head 35 of the elastomeric element 31.

[0040] In principle, several of the embodiments of the deformation protection structure can also be implemented on the support disk 27 in combination.

[0041] List of reference numerals:

[0042] 1 Shock absorber

[0043] 3 Damping valve

[0044] 5 Working cylinder

[0045] 7 Compensation space

[0046] 9 Container tube

[0047] 11 Bottom

[0048] 13 Connector mechanism

[0049] 15 Damping valve body

[0050] 17 Flow passage

[0051] 19 Working space

[0052] 21 Valve disk

[0053] 23 Flow passage

[0054] 25 Valve disk

[0055] 27 Support disk

[0056] 29 Receiving opening

[0057] 31 Elastomeric element

[0058] 33 Dorsal side

[0059] 35 Retaining head

[0060] 37 Connecting element

[0061] 39 Riveting head

[0062] 41 Outer valve seat surface

[0063] 43 Inner valve seat surface

[0064] 45 Annular groove

[0065] 47 pre-throttling ring

[0066] 49 bearing surface

[0067] 51 centering structure

[0068] 53 centering structure

[0069] 55 centering diameter

[0070] 57 cylindrical region

[0071] 59 elastic seat element

[0072] 61 support surface

[0073] 63 free space

[0074] 65 upset head

[0075] 67 adhesive layer

[0076] 69 contact area

[0077] 71 surface structure

[0078] 73 material accumulation part

[0079] 75 groove

[0080] 77 connecting web

[0081] 79 deformation region

[0082] 81 reinforcement region

Claims

1. A damping valve (3) for a shock absorber (1), the damping valve comprising a damping valve body (15) having at least one flow passage (23), an outlet side of the flow passage being at least partially covered by at least one valve disc (25), wherein, The at least one valve disk (25) is lifted from the valve seat surfaces (41; 43) of the damper valve body (15) by the flow impact via the flow passage (23), and the support disk (27) resists further lifting movement, wherein at least one elastomeric element (31) axially penetrates the support disk (27) and abuts against the support disk (27) with an end-side retaining head (35), characterized in that at least the connection between the retaining head (35) and the support disk (27) has a deformation protection structure (67; 71; 81) for the retaining head (35) at least in the radial direction.

2. The damping valve (3) according to claim 1, characterized in that, The deformation protection structure is formed by an adhesive layer (67) between the retaining head (35) and the support disk (27).

3. The damping valve (3) according to claim 1, characterized in that, The support disk (27) has a surface structure (71) at least in the contact area (69) in contact with the retaining head (35).

4. The damping valve (3) according to claim 3, characterized in that, The surface structure (71) is formed by at least one stamping.

5. The damping valve (3) according to claim 4, characterized in that, The stamping (71) is configured as a corrugated structure in the region of the receiving opening (29) for the elastomeric element (31) in the support disk (27).

6. The damping valve (3) according to claim 4, characterized in that, The stamping (71) is configured as at least segmental grooves (75).

7. The damping valve (3) according to claim 4, characterized in that, The stamping (71) is configured as a material accumulation part (73) in the contact area (69).

8. The damping valve (3) according to any one of claims 4 to 7, characterized in that, The surface structure (71) is configured along the circumferential direction of the support disk (27).

9. The damping valve (3) according to claim 1, characterized in that, The elastomeric element (31) has a connecting web (77) between the retaining head and the deformation region (79), wherein the cross-section of the connecting web (77) has a greater elongation in the circumferential direction of the support disk (27) than in the radial direction.

10. The damping valve (3) according to claim 1, characterized in that, The support disk (27) has a reinforcement region (81) for the at least one elastomeric element (31).

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