The invention relates to a damper arrangement, in particular an air spring strut, comprising a shock absorber having an essentially cylindrical housing and an air spring with a working space which is under internal pressure, and comprising an additional volume which can be connected to the working s
The invention relates to a damper arrangement, in particular an air spring strut, comprising a shock absorber having an essentially cylindrical housing and an air spring with a working space which is under internal pressure, and comprising an additional volume which can be connected to the working space via a closable flow duct. It is proposed to enclose the additional volume by a hollow body which surrounds the shock absorber which can be fastened thereto and is formed from an outer cylinder and an inner cylinder, which is connected to the latter and, in particular, is arranged concentrically.
대표청구항▼
The invention claimed is: 1. A shock absorber/pneumatic spring strut comprising an essentially cylindrical housing, an air spring with a working space which is under internal pressure, an additional volume which can be connected to the working space via a closable flow duct, wherein the additional
The invention claimed is: 1. A shock absorber/pneumatic spring strut comprising an essentially cylindrical housing, an air spring with a working space which is under internal pressure, an additional volume which can be connected to the working space via a closable flow duct, wherein the additional volume is enclosed by a hollow body which radially surrounds the housing and is formed from an outer cylinder and a concentrically arranged and connected inner cylinder and the flow duct is formed within an annular gap between the housing and the inner cylinder of the hollow body. 2. The strut as claimed in claim 1, wherein the outer cylinder or the inner cylinder of the hollow body is formed by hydroforming or by a hot drawing-in process by means of rolling metallic pipe lengths. 3. The strut as claimed in claim 1, wherein the axial ends of the outer cylinder and of the inner cylinder are connected to one another frictionally or with an adhesive material in order to form the hollow body. 4. The strut as claimed in claim 1, wherein the hollow body is fastened to the housing of the strut with a form fit or press-fit. 5. The strut as claimed in claim 1, wherein the working space of the air spring surrounds the housing, and wherein the hollow body is arranged in the axial direction of the housing below the working space of the air spring. 6. The strut as claimed in claim 1, wherein the air spring has a flexible wall in the form of a rolling bellows and bounds the working space which is under internal pressure, the rolling bellows being fastened at one end thereof to the outer cylinder of the hollow body. 7. The strut as claimed in claim 1, wherein the outer cylinder of the hollow body forms a sliding surface, in particular running conically, for a rolling fold of the rolling bellows. 8. The strut as claimed in claim 1, wherein the outer cylinder or the inner cylinder has a wall thickness of between 0.5 mm and 4.8 mm. 9. The strut as claimed in claim 1, wherein a press fit is formed in a region below the flow duct between the housing of the shock absorber and the inner cylinder of the hollow body. 10. The strut as claimed in claim 1, wherein at least one spacer is arranged in the flow duct between the housing and the inner cylinder of the hollow body. 11. The strut as claimed in claim 10, wherein the spacer is of annular design and has air passage openings running in the axial direction. 12. The strut as claimed in claim 10, wherein a plurality of the spacers designed as ring segments are arranged in the flow duct between the housing and the inner cylinder of the hollow body. 13. The strut as claimed in claim 10, wherein the inner cylinder of the hollow body has at least one radially outwardly directed, wall recess to form at least one mount for the spacer. 14. The strut as claimed in claim 1, wherein at least two diametrically opposite, but preferably three or more radially inwardly curved bead shaped regions are formed on the inner cylinder of the hollow body in the region of the flow duct. 15. The strut as claimed in claim 1, wherein the inner cylinder of the hollow body has a valve seat for an overflow valve for closing the flow duct. 16. The strut as claimed in claim 15, wherein the inner cylinder of the hollow body has a radially outwardly directed curvature in order to form the valve seat. 17. The strut as claimed in claim 15, wherein the overflow valve has a tappet which reaches through the hollow body, in particular in the radial direction, and which is mounted in the outer cylinder of the hollow body. 18. The strut as claimed in claim 17, wherein the outer cylinder of the hollow body has, for the mounting of the overflow valve, and the tappet, a receiving opening surrounded by a radially inwardly directed wall section of the outer cylinder. 19. The strut as claimed in claim 1, wherein the inner cylinder of the hollow body has at least one radially outwardly directed grooved corrugation in order to form at least one holder for a circumferential seal. 20. A hollow body for the enclosure of an additional volume of air for a shock absorber/pneumatic spring strut of the type having an air spring portion and, a damper arrangement including a shock absorber having an essentially cylindrical housing, and the air spring including a working space under internal pressure comprising: the hollow body being connected to the working space via a closable flow duct, wherein the hollow body includes an outer cylinder concentrically arranged and connected with an inner cylinder and defining a wall, the inner cylinder being adapted for surrounding the housing of the shock absorber and the flow duct is formed within an annular gap between the housing and the inner cylinder of the hollow body. 21. The hollow body as claimed in claim 20, wherein the wall comprises a part of the air spring. 22. The hollow body as claimed in claim 20, wherein the outer cylinder or the inner cylinder is formed by hydroforming or by a hot drawing-in process by means of rolling metallic pipe lengths. 23. The hollow body as claimed in claim 20, wherein the axial ends of the outer cylinder and of the inner cylinder are connected to one another frictionally or with an adhesive material joint. 24. The hollow body as claimed in claim 20, wherein the outer cylinder can be connected at one end to a rolling bellows of the air spring, the rolling bellows being formed by a flexible wall of the air spring. 25. The hollow body as claimed in claim 24, wherein the outer cylinder forms a sliding surface, in particular running conically, for a rolling fold of the rolling bellows. 26. The hollow body as claimed in claim 20, wherein the inner cylinder has at least one radially outwardly directed, wall recess in order to form at least one mount for one or more spacers arranged in the flow duct between the housing of the shock absorber and the inner cylinder. 27. The hollow body as claimed in claim 20, wherein at least two diametrically opposite, radially inwardly curved bead shaped regions are formed on the inner cylinder. 28. The hollow body as claimed in claim 27, wherein three or more bead-like, radially inwardly curved regions are formed on the inner cylinder in the region of the flow duct. 29. The hollow body as claimed in claim 20, wherein the inner cylinder has a valve seat for an overflow valve for closing the flow duct. 30. The hollow body as claimed in claim 20, wherein the inner cylinder has a radially outwardly directed curvature in order to form the valve seat. 31. The hollow body as claimed in claim 20, wherein the outer cylinder has, for the mounting of an overflow valve, in particular a tappet of an overflow valve, a receiving opening which is preferably surrounded by a radially inwardly directed wall section of the outer cylinder. 32. The hollow body as claimed in claim 20, wherein the inner cylinder has at least one radially outwardly directed, grooved corrugation in order to form at least one holder for a circumferential seal. 33. The hollow body as claimed in claim 20, wherein the outer cylinder or the inner cylinder has a wall thickness of 0.5 mm and 4.8 mm.
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이 특허에 인용된 특허 (5)
Geno Wayne H. (Cicero IN) Weitzenhof David A. (Akron OH), Air spring suspension system.
Gandiglio Romolo (Cambiano ITX) Urbinati Maurizio (Bruino ITX), Suspension device for vehicles, comprising a telescopic shock-absorber and an air spring.
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