# US 2025/0018757 A1 · Vibration damper and motor vehicle with active suspension

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- Number: US 2025/0018757 A1
- Document ID: US20250018757A1
- Status: Published application
- Kind: A1
- Application number: 18/766,982
- Filed: 2024-07-09
- Published: 2025-01-16
- Earliest claimed: 2023-07-13
- Assignees: Dr. Ing. h.c. F. Porsche Aktiengesellschaft; ZF Friedrichshafen AG
- Applicants: Dr. Ing. h.c. F. Porsche Aktiengesellschaft; ZF Friedrichshafen AG
- Inventors: Swen Zschocke; Robert SCHREIBER; Rainer BEILNER
- Web page: https://patentgrep.com/patent/US20250018757A1

## CPC

- B60G 13/14: having dampers accumulating utilisable energy, e.g. compressing air {(fluid springs with an accumulator B60G11/30)}
- B60G 15/12: and fluid damper
- B60G 11/27: wherein the fluid is a gas
- F16F 9/06: using both gas and liquid {(F16F9/486 take precedence; self-pumping fluid springs B60G17/044)}
- F16F 9/084: 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
- B60G 2202/152: Pneumatic spring
- B60G 2202/24: Fluid damper
- B60G 2202/314: The spring being a pneumatic spring
- B60G 2202/416: using a pump, e.g. in the line connecting the lower chamber to the upper chamber of the actuator
- B60G 2204/201: of fluid lines
- B60G 2206/41: Dampers
- B60G 2206/42: Springs
- B60G 2206/8201: by welding
- F16F 9/185: {Bitubular units (where compression of gas leads to a clear spring action F16F9/062)}
- F16F 2226/048: Welding
- F16F 2230/105: Flexible, e.g. bellows or bladder
- B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00})
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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.

### Claim 4 (depends on 3)

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.

### Claim 5 (depends on 3)

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.

### Claim 6 (depends on 5)

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.

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 1)

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