# US 2019/0316518 A1 · Acoustic insulation system for internal combustion engine

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- Number: US 2019/0316518 A1
- Document ID: US20190316518A1
- Status: Published application
- Kind: A1
- Application number: 16/279,534
- Filed: 2019-02-19
- Published: 2019-10-17
- Earliest claimed: 2018-04-17
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Haruyuki KATAYAMA
- Web page: https://patentgrep.com/patent/US20190316518A1

## CPC

- F01P 11/12: Filtering, cooling, or silencing cooling-air
- F02B 77/13: Acoustic insulation
- B60R 13/0838: {for engine compartments}
- F01P 5/02: Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
- F01P 7/02: the coolant being cooling-air
- G10K 11/162: Selection of materials
- F01P 2001/005: {Cooling engine rooms}
- F01P 2005/025: {using two or more air pumps}
- F01P 2007/146: {using valves}
- F01P 2050/24: Hybrid vehicles
- F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28)
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR

## Abstract

An acoustic insulation system for an internal combustion engine mounted on a vehicle according to the present disclosure includes: an acoustic insulation cover configured to cover the internal combustion engine with a gap interposed between the acoustic insulation cover and the internal combustion engine; a first fan configured to introduce air toward the interior of the acoustic insulation cover; and a second fan configured to discharge air from the interior of the acoustic insulation cover.

## Claims

### Claim 1

An acoustic insulation system for an internal combustion engine mounted on a vehicle, the acoustic insulation system comprising:
an acoustic insulation cover configured to cover the internal combustion engine with a gap interposed between the acoustic insulation cover and the internal combustion engine;
a first fan configured to introduce air toward an interior of the acoustic insulation cover; and
a second fan configured to discharge air from the interior of the acoustic insulation cover.

### Claim 2 (depends on 1)

The acoustic insulation system according to claim 1,
wherein the acoustic insulation cover includes an opposed portion that is opposed to the second fan, and
wherein the opposed portion includes an opening portion and a flap configured to open and close the opening portion.

### Claim 3 (depends on 2)

The acoustic insulation system according to claim 2,
wherein the flap is configured to close during operation of the internal combustion engine and open during stop of the internal combustion engine.

### Claim 4 (depends on 1)

The acoustic insulation system according to claim 1,
wherein the first fan and the second fan are integrally arranged in parallel with a bulkhead interposed between the first fan and the second fan,
wherein the bulkhead is formed so as to protrude toward the internal combustion engine and separate a flow of air by the first fan from a flow of air by the second fan, and
wherein the second fan is configured to blow air in a direction opposite to a flow direction of air by the first fan.

### Claim 5 (depends on 2)

The acoustic insulation system according to claim 2,
wherein the first fan and the second fan are integrally arranged in parallel with a bulkhead interposed between the first fan and the second fan,
wherein the bulkhead is formed so as to separate a flow of air by the first fan from a flow of air by the second fan,
wherein the flap is configured to close during operation of the internal combustion engine and open during stop of the internal combustion engine, and
wherein the second fan is configured, during the stop of the internal combustion engine, to blow air in a direction opposite to a flow direction of air by the first fan.

### Claim 6 (depends on 1)

The acoustic insulation system according to claim 1,
wherein the internal combustion engine includes a portion which is not covered by the acoustic insulation cover, and
wherein the first fan is opposed to the internal combustion engine at the portion which is not covered by the acoustic insulation cover.