# US 11,078,872 B2 · Engine with EGR device

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- Number: US 11,078,872 B2
- Document ID: US11078872B2
- Status: Granted
- Kind: B2
- Application number: 16/202,209
- Filed: 2018-11-28
- Published: 2019-07-04
- Granted: 2021-08-03
- Earliest claimed: 2017-12-28
- Assignees: Kubota Corporation
- Applicants: KUBOTA Corporation
- Inventors: Yoshikazu Takemoto; Hideyuki Goto; Takahito Hamasaki; Kentaro Nagai; Tomoya Akitomo; Kumiko Sakaguchi
- Web page: https://patentgrep.com/patent/US11078872B2

## CPC

- F02M 26/22: with coolers in the recirculation passage
- F01P 3/20: Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence)
- F02M 26/11: Manufacture or assembly of EGR systems; Materials or coatings specially adapted for EGR systems
- 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
- F28D 7/106: {consisting of two coaxial conduits or modules of two coaxial conduits}
- F28D 21/0003: {the heat being recuperated from exhaust gases (F28D21/0014 takes precedence)}
- F28F 1/025: {with variable shape, e.g. with modified tube ends, with different geometrical features (F28F1/06, F28F1/08, F28F9/16, F28F9/18 take precedence)}
- F28F 1/06: crimped or corrugated in cross-section
- F01P 2060/00: Cooling circuits using auxiliaries
- F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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)
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)

## Abstract

An engine with an EGR device includes an engine case, and an EGR pipe that introduces an EGR gas into an intake path. The EGR pipe is arranged to pass through an inside of the engine case. A part of the EGR pipe in the engine case is arranged to face a cooling water path in the engine case. The engine case is defined by a cylinder head. The cooling water path is arranged to surround a whole circumference of the EGR pipe.

## Claims

### Claim 1

An engine with an EGR device comprising:
an engine case; and
an EGR pipe that introduces an EGR gas into an intake path, the EGR pipe being arranged to pass through an inside of the engine case,
wherein
a part of the EGR pipe in the engine case is arranged to face a cooling water path in the engine case,
a case end portion formed by an end portion of the engine case is partially expanded to an outer side,
the EGR pipe is arranged in an expanded portion of the case end portion expanded toward the outer side,
the cooling water path includes a lower water path located at a lower portion of the engine case and an outer peripheral water path formed at an outer periphery of the EGR pipe at an expanded side,
the engine case is provided with a guide portion, which guides cooling water, in a portion of the EGR pipe at an outer side in a radial direction, in the cooling water path, and
the guide portion includes a guide body protruded into the lower water path at a lower portion of the EGR pipe, and a circumferential guide portion protruded into a half of the outer peripheral water path so as to surround a half of the EGR pipe.

### Claim 2 (depends on 1)

The engine with the EGR device according to claim 1, wherein the cooling water path is formed to surround the EGR pipe.

### Claim 3 (depends on 2)

The engine with the EGR device according to claim 2, wherein the EGR pipe is formed of an aluminum alloy.

### Claim 4 (depends on 1)

The engine with the EGR device according to claim 1, wherein the EGR pipe is formed of an aluminum alloy.

### Claim 5 (depends on 1)

The engine with the EGR device according to claim 1, wherein the engine case is defined by a cylinder head.