# US 2017/0284342 A1 · Exhaust-gas recirculation device

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- Number: US 2017/0284342 A1
- Document ID: US20170284342A1
- Status: Published application
- Kind: A1
- Application number: 15/453,236
- Filed: 2017-03-08
- Published: 2017-10-05
- Earliest claimed: 2016-03-31
- Assignees: Fuji Jukogyo Kabushiki Kaisha
- Applicants: Fuji Jukogyo Kabushiki Kaisha
- Inventors: Yoshihiro TERAI
- Web page: https://patentgrep.com/patent/US20170284342A1

## CPC

- F02M 26/20: Feeding recirculated exhaust gases directly into the combustion chambers or into the intake runners
- F02M 26/41: characterised by the arrangement of the recirculation passage in relation to the engine, e.g. to cylinder heads, liners, spark plugs or manifolds; characterised by the arrangement of the recirculation passage in relation to specially adapted combustion chambers
- F02M 26/44: in which a main EGR passage is branched into multiple passages
- F02M 35/104: Intake manifolds
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF

## Abstract

An exhaust-gas recirculation device is configured to be attached to a cylinder block including cylinders individually including built-in pistons and cause a portion of exhaust gas flowing through an exhaust system to recirculate to an intake system. The exhaust-gas recirculation device includes an intake manifold, a recirculation pipe, and a recirculation manifold. The intake manifold includes intake branches each including an intake passage communicating with an intake port and is configured to be disposed at the cylinder block. The recirculation pipe is coupled to an exhaust manifold capable of guiding the exhaust gas outward. The recirculation manifold includes recirculation branches each provided with a recirculation passage communicating with the intake passage via an introduction hole and is coupled to the recirculation pipe. The introduction hole has an inner diameter at a recirculation-passage side that is larger than an inner diameter at an intake-passage side.

## Claims

### Claim 1

An exhaust-gas recirculation device that is configured to be attached to a cylinder block comprising cylinders individually comprising built-in pistons and cause a portion of exhaust gas flowing through an exhaust system to recirculate to an intake system, the exhaust-gas recirculation device comprising:
an intake manifold that comprises intake branches each comprising an intake passage communicating with an intake port and that is configured to be disposed at the cylinder block;
a recirculation pipe coupled to an exhaust manifold capable of guiding the exhaust gas outward; and
a recirculation manifold that comprises recirculation branches each provided with a recirculation passage communicating with the intake passage via an introduction hole and that is coupled to the recirculation pipe,
wherein the introduction hole has an inner diameter at a recirculation-passage side that is larger than an inner diameter at an intake-passage side.

### Claim 2 (depends on 1)

The exhaust-gas recirculation device according to claim 1,
wherein the introduction hole is any one of a curved surface, a tapered surface, and a stepped tapered surface constituted of a straight surface at the intake-passage side and a tapered surface at the recirculation-passage side.

### Claim 3 (depends on 1)

The exhaust-gas recirculation device according to claim 1,
wherein the intake manifold is configured to be disposed at an upper side of the cylinder block, and the recirculation manifold is configured to be disposed between the intake manifold and the cylinder block.

### Claim 4 (depends on 2)

The exhaust-gas recirculation device according to claim 2,
wherein the intake manifold is configured to be disposed at an upper side of the cylinder block, and the recirculation manifold is configured to be disposed between the intake manifold and the cylinder block.