# US 2022/0032718 A1 · Air suspension apparatus

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- Number: US 2022/0032718 A1
- Document ID: US20220032718A1
- Status: Published application
- Kind: A1
- Application number: 17/276,948
- Filed: 2019-09-18
- Published: 2022-02-03
- Earliest claimed: 2018-09-25
- Assignees: Hitachi Astemo, Ltd.
- Applicants: Hitachi Astemo, Ltd.
- Inventors: Yoshinori KAWAI; Hiroshi SAKAI; Kan KOBAYASHI
- Web page: https://patentgrep.com/patent/US20220032718A1

## CPC

- B60G 17/0525: {Height adjusting or levelling valves}
- B60G 17/015: the regulating means comprising electric or electronic elements ({B60G17/002}, B60G17/005 take precedence)
- B60G 2202/152: Pneumatic spring
- B60G 2202/154: with an accumulator
- B60G 2202/42: Electric actuator
- B60G 2400/252: vertical
- B60G 2400/51222: Pneumatic
- B60G 2500/202: Height or leveling valve for air-springs
- B60G 2500/205: Air-compressor operation
- B60G 2600/26: Electromagnets; Solenoids
- B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00})

## Abstract

An air suspension apparatus includes a compressor configured to compress air, a tank configured to store the air, a tank-side suction conduit configured to supply the compressed air in this tank to an intake side of the compressor, a tank conduit connecting a discharge side of the compressor and the tank, an air suspension connected to the discharge side of the compressor via an air drier, an intake electromagnetic valve provided in the tank-side suction conduit, a return electromagnetic valve provided in the tank conduit, and a discharge conduit provided so as to branch off from between the discharge side of the compressor and the air drier and configured to be connected to an atmosphere by opening a discharge electromagnetic valve.

## Claims

### Claim 1

An air suspension apparatus comprising:
a compressor configured to compress air;
a tank configured to store the air;
a first passage configured to supply the compressed air in this tank to a suction side of the compressor;
a second passage connecting a discharge side of the compressor and the tank;
an air suspension connected to the discharge side of the compressor via an air drier;
a first valve provided in the first passage;
a second valve provided in the second passage; and
a third passage provided so as to branch off from between the discharge side of the compressor and the air drier and configured to be connected to an atmosphere by opening a third valve,
wherein the compressed air in the tank is supplied into the air suspension by closing the second valve and the third valve and opening the first valve, and
wherein the air drier can be regenerated via the compressed air in the air suspension by closing the first valve and the second valve and opening the third valve.

### Claim 2 (depends on 1)

The air suspension apparatus according to claim 1, wherein the compressed air compressed from the atmosphere is supplied to the air suspension without intervention of the tank according to an instruction from a control unit.

### Claim 3 (depends on 1)

The air suspension apparatus according to claim 1, further comprising a fourth passage connecting the air drier and the air suspension,
wherein a fourth valve is provided in the fourth passage.

### Claim 4 (depends on 1)

The air suspension apparatus according to claim 1, wherein a first orifice is provided between the air drier and the fourth valve and a second orifice is provided between the air drier and the second valve, and the first orifice has a larger orifice diameter than the second orifice.

### Claim 5 (depends on 1)

The air suspension apparatus according to claim 1, wherein the first valve and the second valve are two-way electromagnetic valves.

### Claim 6 (depends on 2)

The air suspension apparatus according to claim 2, wherein the first valve and the second valve are two-way electromagnetic valves.

### Claim 7 (depends on 3)

The air suspension apparatus according to claim 3, wherein the first valve and the second valve are two-way electromagnetic valves.

### Claim 8 (depends on 4)

The air suspension apparatus according to claim 4, wherein the first valve and the second valve are two-way electromagnetic valves.