Vibration damper and motor vehicle with active suspension

Patent metadata

Field	Value
Publication number	US-12251972-B2
Application number	US-202418766982-A
Country	US
Kind code	B2
Filing date	Jul 9, 2024
Priority date	Jul 13, 2023
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

A vibration damper with a damper piston which is arranged in a main tube with hydraulic medium and can be moved to and fro in an axial direction relative to the main tube. The main tube is arranged in a container tube, wherein an intermediate tube is arranged between the main tube and the container tube. The main tube, the intermediate tube and the container tube are arranged coaxially in a three-tube damper. The damper piston is attached at one end of a piston rod. The three-tube damper is equipped with a hydraulic end-position damping and at its end opposite the piston rod, has a central valve block with two damper valve devices. The central valve block is partially fitted with an air spring resting on an axial support ring which is connected by a single main weld seam to the container tube and central valve block by substance bonding.

First claim

What is claimed is:

1. A vibration damper comprising:
a container tube;
a main tube arranged in the container tube;
an intermediate tube arranged between the main tube and the container tube;
wherein the main tube, the intermediate tube and the container tube are arranged coaxially to form a three-tube damper,
a damper piston arranged in the main tube, wherein the damper piston is configured to be moved to and fro in an axial direction relative to the main tube,
wherein the damper piston is attached at one end of a piston rod,
wherein the three-tube damper comprises (i) a hydraulic end-position damping and (ii) a central valve block with two damper valve devices arranged at an end of the three-tube damper that is opposite the piston rod,
wherein the central valve block is partially surrounded by an air spring resting on an axial support ring,
wherein the axial support ring is connected by a single main weld seam to the container tube and the central valve block,
wherein on a piston rod side of the three-tube damper, the three-tube damper comprises a gas compensation volume which is arranged in an annular space between the intermediate tube and the container tube.

2. The vibration damper according to claim 1 , wherein the axial support ring has a rectangular ring cross-section.

3. The vibration damper according to claim 1 , wherein the axial support ring is combined with a support sleeve which surrounds an exterior of the container tube.

4. The vibration damper according to claim 3 , further comprising a chamfer disposed on an outside of the support sleeve and at an end of the support sleeve that faces away from the axial support ring.

5. The vibration damper according to claim 3 , wherein the support sleeve is combined with an adapter body which serves to provide an axial extension control for the air spring disposed on the axial support ring.

6. The vibration damper according to claim 5 , wherein the air spring has an air spring housing which is fixed to the adapter body in an axial direction by a snap or latch connection.

7. The vibration damper according to claim 1 , wherein the main weld seam is arranged on a ring face of the axial support ring facing the central valve block.

8. The vibration damper according to claim 1 , wherein the main weld seam is arranged on an outer circumferential face of a base block of the central valve block.

9. A motor vehicle with an active suspension that comprises the vibration damper according to claim 1 .

Assignees

• Porsche Ag
• Zahnradfabrik Friedrichshafen

Inventors

• Zschocke Swen
• Schreiber Robert
• Beilner Rainer

Classifications

• F16F9/06 Primary

  using both gas and liquid {(F16F9/486 take precedence; self-pumping fluid springs B60G17/044)} · CPC title

• F16F2230/105

  Flexible, e.g. bellows or bladder · CPC title

• F16F2226/048

  Welding · CPC title

• F16F9/084

  comprising a gas spring contained within a flexible wall, the wall not being in contact with the damping fluid, i.e. mounted externally on the damper cylinder · CPC title

• F16F9/185

  Bitubular units (where compression of gas leads to a clear spring action F16F9/062) · CPC title