PRESSURE BUFFER STOP FOR A VIBRATION DAMPER

Abstract

A pressure buffer stop for a vibration damper that comprises for being at least partially received in a dome bearing housing an outer contour and for coaxial arrangement on a piston rod of the vibration damper a hollow-cylindrical basic structure with an inner contour, wherein the outer contour of the pressure buffer stop comprises in at least one region for being at least partially received in the dome bearing housing a three-dimensionally structured surface.

Claims

1.-12. (canceled)

13. A pressure buffer stop for a vibration damper, wherein the pressure buffer stop comprises: an outer contour configured to be at least partially received in a dome bearing housing of the vibration damper, a hollow-cylindrical basic structure with an inner contour configured to arrange the pressure buffer stop coaxially on a piston rod of the vibration damper, wherein the outer contour of the pressure buffer stop comprises in at least one region configured to be at least partially received in the dome bearing housing a three-dimensionally structured surface.

14. The pressure buffer stop of claim 13, wherein the outer contour comprises a three-dimensional topographical surface structure.

15. The pressure buffer stop of claim 13, wherein the three-dimensionally structured surface comprises a plurality of projections and/or a plurality of recesses.

16. The pressure buffer stop of claim 15, wherein the plurality of projections and/or recesses are at least partially distributed homogeneously, at least in the region.

17. The pressure buffer stop of claim 15, wherein the plurality of projections and/or recesses are at least partially distributed heterogeneously, at least in the region.

18. The pressure buffer stop of claim 13, including a plurality of clamping elements arranged on the inner contour of the pressure buffer stop, the clamping elements sized and shaped to extend and connect to the piston rod to form a clamping connection between the piston rod and the pressure buffer stop and arrange the pressure buffer stop coaxially on the piston rod.

19. The pressure buffer stop of claim 18, wherein the plurality of clamping elements at least partially comprise a helical geometric construction and are arranged on the inner contour of the pressure buffer stop in a helical manner.

20. The pressure buffer stop of claim 18, wherein the plurality of clamping elements are arranged in groups as clamping modules in the piston rod longitudinal direction on the inner contour of the pressure buffer stop.

21. The pressure buffer stop of claim 20, wherein the plurality of clamping elements and/or clamping modules are arranged in opposing directions in a helical manner in the piston rod longitudinal direction on the inner contour of the pressure buffer stop.

22. The pressure buffer stop of claim 20, wherein the plurality of clamping elements and/or clamping modules comprise a three-dimensional structured surface at least in a region for the coaxial arrangement on the piston rod.

23. The pressure buffer stop of claim 22, wherein the three-dimensionally structured surface of the plurality of clamping elements and/or clamping modules comprises a plurality of projections and/or a plurality of recesses.

24. A vibration damper for a vehicle, comprising: a damper pipe at least partially filled with damping fluid, a piston rod movably disposed in the damper pipe, and a piston operatively connected to the piston rod, the piston dividing an inner space of the damper pipe into a piston-rod-side operating space and an operating space remote from the piston rod, and the pressure buffer stop of claim 13 arranged on the piston rod.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The pressure buffer stop according to the invention is explained with reference to the drawings.

[0037] FIG. 1 is a schematic oblique plan view of a pressure buffer stop according to an embodiment of the invention,

[0038] FIG. 2 is a schematic longitudinal section of a pressure buffer stop according to FIG. 1 with clamping elements which are formed in the inner contour according to an embodiment of the invention,

[0039] FIG. 3 is a schematic longitudinal section of a vibration damper having a pressure buffer stop according to FIG. 2 according to an embodiment of the invention.

[0040] FIG. 1 is a schematic oblique plan view of a pressure buffer stop 1 having a hollow-cylindrical basic structure comprising an outer contour 4 and an inner contour 6. The outer contour 4 comprises a three-dimensional (topographic) surface structure 7. The three-dimensional (topographic) surface structure 7 a plurality of projections (8, 8, 8, 8) and/or a plurality of recesses (9, 9, 9, 9). The plurality of projections (8, 8, 8, 8) and/or plurality of recesses (9, 9, 9, 9) are distributed at least partially in a homogeneous manner. A plurality of clamping elements 10, 10, 10, 10 are arranged on the inner contour 6 of the pressure buffer stop 1, wherein, for example, a clamping element 10 is illustrated.

[0041] FIG. 2 is a schematic longitudinal section of the pressure buffer stop 1 according to FIG. 1 with the clamping elements 10, 10, 10, 10 formed in the inner contour 6. The pressure buffer stop 1 comprises the outer contour 4 and the inner contour 6, wherein the clamping elements 10, 10, 10, 10 of the inner contour 6 are illustrated arranged. The plurality of clamping elements 10, 10, 10, 10 illustrated have a helical geometric configuration. In addition, the illustrated plurality of clamping elements 10, 10, 10, 10 are illustrated in a state arranged in groups as clamping modules 11, 11, 11.

[0042] FIG. 3 is a schematic longitudinal section of a vibration damper 2 with the pressure buffer stop 1 according to FIG. 2. The pressure buffer stop 1 is arranged coaxially on a piston rod 5 of the vibration damper 2 and is received in a dome bearing housing 3. The three-dimensional (topographic) surface structure 7 is constructed in at least one region of the at least partial receiving member of the pressure buffer stop 1.

BRIEF DESCRIPTION OF THE TEST EXAMPLES

[0043] Exemplary pressure buffer stops according to the invention were produced using an injection-molding method. A cellular elastomer (PUR (NDI) Cellasto MH24-45) was used as a plastics material. Subsequently, the surface of the pressure buffer stop produced was scanned with a 3D scanner and evaluated. The three-dimensional (topographic) surface structure of the outer contour of the pressure buffer stop was detected with a 3D scanner and evaluated. An ATOS Core 135 with the ATOS Professional Software (V8 SR1) was used for the data acquisition as a sensor and the GOM Inspect Professional V8 SR1 from the company GOM, Gesellschaft fr Optische Messtechnik mbH, Mittelweg 7-8, 38106 Braunschweig, Germany was used for evaluation.

[0044] Firstly, a reference face which corresponds to the zero plane of the shaping tool used and against which the surface comparison was carried out was constructed. To this end, where possible all the regions of the smooth base face, that is to say, the zero plane for the portion to be analyzed, were selected and a triangulated polynomial surface (Construct Surface Triangulated polynomial surface) was constructed. In the software, 5 was selected for surface degree and all was selected for used locations as the parameters.

[0045] This surface was converted by means of Operations CAD Actual-Network in CAD into a CAD and with respect to this CAD a surface comparison was subsequently carried out.

[0046] The following Table 1 shows by way of example the evaluated data of a measurement series measured with the 3D scan in respect of the projections and recesses of the three-dimensional surface structure of the outer contour according to the invention of the pressure buffer stop.

TABLE-US-00001 TABLE 1 Projections and recesses measured with the 3D scan in respect of the three-dimensional surface structure of the outer contour according to the invention of the pressure buffer stop. Min [mm] Max [mm] Percentage [%] 0.3 5 0.2 0.3 5 0.1 0.2 25 0.1 0.1 40 0.2 0.1 10 0.3 0.2 5 0.3 5

[0047] The following Table 2 shows by way of example the evaluated data of a measurement series measured with the 3D scan in respect of the projections and recesses of the three-dimensional surface structure of the inner contour according to the invention of the pressure buffer stop.

TABLE-US-00002 TABLE 2 Projections and recesses measured with the 3D scan in respect of the three-dimensional surface structure of the inner contour according to the invention of a plurality of clamping elements of the pressure buffer stop. Min [mm] Max [mm] Percentage [%] 0.3 5 0.2 0.3 5 0.1 0.2 25 0.1 0.1 40 0.2 0.1 10 0.3 0.2 5 0.3 5

INDUSTRIAL APPLICABILITY

[0048] Pressure buffer stops of the type described above are used in the production of vibration dampers, in particular vibration dampers of motor vehicles.

LIST OF REFERENCE NUMERALS

[0049] 1=Pressure buffer stop

[0050] 2=Vibration damper

[0051] 3=Dome bearing housing

[0052] 4=Outer contour

[0053] 5=Piston rod

[0054] 6=Inner contour

[0055] 7=Three-dimensional structured surface

[0056] 8, 8, 8, 8=Projection(s)

[0057] 9, 9, 9, 9=Recess(es)

[0058] 10, 10, 10, 10=Clamping element(s)

[0059] 11, 11, 11=Clamping module(s)