Energy-recuperating fluid vibration damper

Patent metadata

Field	Value
Publication number	US-9926918-B2
Application number	US-201314413652-A
Country	US
Kind code	B2
Filing date	Jun 19, 2013
Priority date	Jul 9, 2012
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

Energy-recuperating vibration damper having a cylinder in which a displacer executes a limited operating movement in a working chamber so that a pressurized fluid is supplied to a fluid motor which drives a generator. A compensation chamber compensates for a change in volume of the pressurized fluid. A pressure accumulator is provided in addition to the compensation chamber, which pressure accumulator communicates with and is parallel-connected to the fluid motor.

First claim

The invention claimed is:

1. An energy-recuperating vibration damper comprising:
a cylinder;
a generator;
a fluid motor that drives the generator;
a displacer arranged in the cylinder that divides the cylinder into a first and second working chamber, the displacer configured to execute a limited operating movement so that a pressurized fluid is supplied to the fluid motor;
a compensation chamber arranged in the cylinder that compensates for a change in volume of the pressurized fluid;
at least one pressure accumulator that communicates with and is parallel-connected to the fluid motor; and
an emergency operation detection valve arranged upstream of the fluid motor and configured to supply a fluid flow to a damping valve in case of emergency operation.

2. The energy-recuperating vibration damper according to claim 1 , further comprising at least one check valve configured to prevent the fluid from flowing out of the pressure accumulator directly into at least one of the first and second working chambers.

3. The energy-recuperating vibration damper according to claim 1 , wherein a steady state pressure in an additional pressure accumulator is greater than a working pressure at maximum usage of the compensation chamber.

4. The energy-recuperating vibration damper according to claim 1 , wherein a respective pressure accumulator is connected for each incident flow direction to the fluid motor.

5. The energy-recuperating vibration damper according to claim 1 , wherein the displacer is a piston/piston rod assembly and an additional pressure accumulator is arranged inside this assembly.

6. The energy-recuperating vibration damper according to claim 5 , wherein the piston rod is tubular and the additional pressure accumulator is arranged inside the piston rod.

7. The energy-recuperating vibration damper according to claim 1 , wherein the emergency operation detection valve is actuated by a control pressure that is proportional to an input pressure p1 to the fluid motor.

8. The energy-recuperating vibration damper according to claim 1 , wherein the emergency operation detection valve is actuated by a control pressure that is proportional to an output pressure p2 of the fluid motor.

Assignees

• Zahnradfabrik Friedrichshafen

Inventors

• Triebel Michael
• Thomae Achim
• Baalmann Helmut
• Broocks Wilhelm-Heinrich
• Lichtlein Oswald
• Heyn Steffen
• Förster Andreas
• Gajek Joachim
• Pradel Robert
• Sonnemann Anke

Classifications

• F16F9/3214 Primary

  of pistons (F16F9/0227 and F16F9/36 take precedence; throttling passages in or on piston body F16F9/3405) · CPC title

• B60G2300/60

  Vehicles using regenerative power · CPC title

• B60G2500/10

  Damping action or damper · CPC title

• F16F9/096

  comprising a hydropneumatic accumulator of the membrane type provided on the upper or the lower end of a damper or separately from or laterally on the damper {(F16F9/088 takes precedence)} · CPC title

• F15B1/04

  Accumulators · CPC title