# US 5,263,559 A · Damping system for a shock absorber having a one-way check valve

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- Number: US 5,263,559 A
- Document ID: US5263559A
- Status: Granted
- Kind: A
- Application number: 07/553,520
- Filed: 1990-07-18
- Granted: 1993-11-23
- Earliest claimed: 1989-09-23
- Assignees: Robert Bosch GmbH
- Inventors: Michael Mettner
- Web page: https://patentgrep.com/patent/US5263559A

## CPC

- F16F 9/466: {Throttling control, i.e. regulation of flow passage geometry (F16F9/464, F16F9/465 take precedence)}
- B60G 17/08: Characteristics of fluid dampers (adjusting fluid dampers in general F16F9/44 - F16F9/53)
- F16F 9/062: {Bi-tubular units}
- B60G 2202/154: with an accumulator
- B60G 2400/202: Piston speed; Relative velocity between vehicle body and wheel
- B60G 2400/252: vertical
- B60G 2400/51222: Pneumatic
- B60G 2400/5182: Fluid damper
- B60G 2500/10: Damping action or damper
- B60G 2500/30: Height or ground clearance
- B60G 2600/26: Electromagnets; Solenoids
- B60G 2800/012: Rolling condition
- B60G 2800/014: Pitch; Nose dive
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00})

## Abstract

A shock absorber damping system including at least one cylinder including a compensation chamber which is made to communicate with a pressure source. Thus the load-bearing capacity of the shock absorber can additionally be arbitrarily adjusted and varied within wide limits, independently of a damping of the shock absorber.

## Claims

### Claim 1

A damping system having a shock absorber including at least one cylinder that is at least partly filled with a pressure fluid and is disposable between two masses of a vehicle, the spacing between which is variable, a damper piston connected to a piston rod, said damper piston divides a first work chamber, penetrated by the piston rod, from a second work chamber in said at least one cylinder, a second connecting conduit, a check valve which monitors said second connecting conduit to enable a flow of pressure fluid out of the second work chamber into the first work chamber; a first connecting conduit, said first connecting conduit is monitored by a second check valve to enable a pressure fluid flow out of a compensation chamber into the second work chamber, and a third connecting conduit which connects said first work chamber with said compensation chamber, said third connecting conduit is monitored by a throttle restriction which restricts a fluid flow of a flow of pressure fluid out of the first work chamber into the compensation chamber, and a pressure source connected to said compensation chamber (30) for varying pressure within said compensation chamber.

### Claim 2 (depends on 1)

A damping system as set forth in claim 1, in which said third connecting conduit connects said first work chamber with said compensation chamber and said pressure source is connected to said compensation chamber via said third connecting conduit.

### Claim 3 (depends on 1)

A damping system as defined in claim 1, in which said compensation chamber is formed by an outer cylinder which surrounds said at least one cylinder.

### Claim 4 (depends on 1)

A damping system as defined by claim 1, in which said pressure source (1) includes a pump (44), a control valve (48) and a supply container (42), wherein the compensation chamber (30) communicates by means of the control valve (48), with a pressure connection (49) of the pump (44) and alternatively with the supply container (42) to control fluid pressure within said compensation chamber.

### Claim 5 (depends on 4)

A damping system as set forth in claim 4, in which said throttle restriction is variable.

### Claim 6 (depends on 5)

A damping system as set forth in claim 5, which includes an electric control unit (2) that controls said control valve (48) and said variable throttle restriction (34).