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DE-102024133093-A1 - Damper and vehicle with a damper

DE102024133093A1DE 102024133093 A1DE102024133093 A1DE 102024133093A1DE-102024133093-A1

Abstract

The present invention relates to a damper (1) and a vehicle with a damper (1) according to the invention. The damper (1) according to the invention has a damper tube (10) which encloses and limits a working volume (11) in which a piston (20) is provided that divides the working volume (11) into two different chambers, the piston (20) being connected to a piston rod (21) which projects from the damper tube (10) at a closure section (40). Furthermore, a protective tube (50) is provided which at least partially encloses the damper tube (10) regardless of the position of the damper. A labyrinth structure (80) is also arranged between the protective tube (50) and the damper tube (10), which is designed to act as a flow resistance for an airflow generated between the protective tube (50) and the damper tube (10) during a damper stroke.

Inventors

  • Maximilian Haase

Assignees

  • DR. ING. H.C. F. PORSCHE AKTIENGESELLSCHAFT

Dates

Publication Date
20260513
Application Date
20241112

Claims (9)

  1. Damper (1) comprising: a damper tube (10) enclosing a working volume (11) in which a piston (20) is provided, which separates the working volume (11) into two different chambers, the piston (20) being connected to a piston rod (21) which projects from the damper tube (10) at a closure section (40); a protective tube (50) which at least partially encloses the damper tube (10) regardless of the position of the damper, wherein: a labyrinth structure (80) is arranged between the protective tube (50) and the damper tube (10), which is designed to act as a flow resistance for an airflow generated between the protective tube (50) and the damper tube (10) during a damper stroke.
  2. Damper (1) according to the preceding claim, wherein the labyrinth structure (80) is formed from different labyrinth elements (81, 82) which are designed and arranged to redirect the airflow.
  3. Damper (1) according to the preceding claim, wherein the labyrinth elements (81, 82) are arranged offset from each other in an immersion direction of the damper (1).
  4. Damper (1) according to the preceding claim, wherein first labyrinth elements (81) and second labyrinth elements (82) are provided in the labyrinth structure (80), wherein the first labyrinth elements (81) extend less far in the radial direction of the damper tube (10) than the second labyrinth elements (82).
  5. Damper (1) according to one of the preceding Claims 3 or 4 , wherein in the immersion direction of the damper (1) three rows of labyrinth elements (81, 82) are provided in the labyrinth structure (80), wherein in particular the middle row is formed from second labyrinth elements (82) and the other two rows from first labyrinth elements (81).
  6. Damper (1) according to one of the preceding claims, wherein the labyrinth structure (80) is at least partially formed from an elastic material.
  7. Damper (1) according to one of the preceding claims, wherein the labyrinth structure (80) is arranged on the damper tube (10).
  8. Damper (1) according to one of the preceding Claims 1 until 6 , wherein the labyrinth structure (80) is arranged on the protective tube (50).
  9. Vehicle comprising at least one damper (1) according to one of the preceding claims.

Description

The present invention relates to a damper and a vehicle with a damper. For the purposes of this application, a damper is defined as a technical device capable of damping movements. Dampers are known in the prior art, for example, in the field of vehicle chassis. The design of an embodiment of a damper, such as that used in a motor vehicle, is characterized by 1 described. 1 Figure 1 shows a schematic cross-sectional representation of a damper 1. The central element of the damper 1 is the damper tube 10, which forms a closed working volume 11. A piston 20 divides the working volume 11 into two separate chambers. The working fluid, which is typically a hydraulic fluid, can flow from one chamber to the other via valves 22 designed as check valves. The throttling effect of the valves 20 dampens the movement of the piston 20, thus dissipating energy from the movement and producing the damping effect. Furthermore, a piston rod 21 is provided, which is attached to the piston 20 and protrudes from the working volume 11. To ensure this, a sealing section 40 is provided on one end face of the working volume 11 or the damper tube 10. This section guides the piston rod 21 in its stroke and seals the working volume 11 against the piston rod 21 via a sealing assembly 41. The piston rod 21 has an upper suspension 61, while a lower suspension 62 is provided on the opposite side of the damper 1. In a vehicle, the upper suspension 61 is connected to the vehicle body, while the lower suspension is connected to the wheel suspension. Thus, movements between the vehicle body and the wheels can be dampened by the damper. It should be noted here that other detailed solutions besides those described in 1 The embodiment shown is conceivable. This embodiment serves only as an exemplary illustration of a simple, basic damper design. Furthermore, a protective tube 50 is provided, which at least partially encompasses or encases the damper tube 10. The protective tube 50 is also firmly connected to the piston rod 21. The protective tube is designed to protect the closure section 40 and the sealing assembly 41 provided therein, in order to largely prevent the effects of corrosive liquids or dirt. When a pumping motion is transmitted via the lower suspension 61 to the damper tube 10, the piston 21 moves within the working volume, thereby changing the pressure in the chambers separated by the piston 20. Pressure equalization occurs via the valves 22, allowing the piston 20 to move, thus enlarging one chamber and shrinking the other. The movement of the piston 20 and the rigidly connected piston rod 21 also causes the protective tube 50 to move relative to the damper tube 10. This relative movement induces an airflow that may introduce dirt or corrosive liquid into the area between the protective tube 50 and the damper tube 10, leading to increased wear. The ingress of liquid or dirt should therefore be avoided as much as possible. Various damper arrangements are known from the prior art. (From document) DE 1 041 742 B A sealing method for telescopic shock absorbers is known in which sealing rings are arranged between the damper tube and the protective tube. (From document) JP S60122036 U A sealing structure between the damper tube and protective tube of a damper is also known. Document DE 10 2012 213 833 B3 Disclosing a piston rod-cylinder assembly, wherein a sealing device is provided between the piston and the protective tube, the sealing device consisting of a sealing surface and a helical ventilation groove formed therein. Document DE 3 836 897 A1 relates to a device for protecting a piston rod of a hydropneumatic adjusting element, wherein a protective tube is arranged which is arranged opposite the pressure tube by a ring element. Against the background described above, the object of the present invention is to provide a damper that largely prevents the ingress of liquid and dirt at the sealing section. It is also an object to provide a vehicle equipped with a damper according to the invention. This problem is solved by the subject matter of the independent claims. Advantageous embodiments of the invention are disclosed in the dependent claims. The damper according to the invention has a damper tube which encloses and limits a working volume in which a piston is provided which divides the working volume into two different chambers, wherein the piston is connected to a piston rod which is attached to a closure The section of the damper tube protrudes from the damper tube. Furthermore, a protective tube is provided which, regardless of the damper's position, at least partially encloses the damper tube. In other words, the protective tube encompasses the damper tube, wherein preferably both the damper tube and the protective tube are cylindrical, and the damper tube, as a smaller cylinder, is at least partially enclosed within the protective tube, which is a larger cylinder. The section of the protective tube where it encompasses the dam