# US 10,119,452 B2 · Internal combustion engine provided with cooling water passage

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- Number: US 10,119,452 B2
- Document ID: US10119452B2
- Status: Granted
- Kind: B2
- Application number: 15/600,952
- Filed: 2017-05-22
- Published: 2017-11-23
- Granted: 2018-11-06
- Earliest claimed: 2016-05-23
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Yukio Konishi
- Web page: https://patentgrep.com/patent/US10119452B2

## CPC

- F01P 3/12: Arrangements for cooling other engine or machine parts
- F01P 3/02: Arrangements for cooling cylinders or cylinder heads
- F01P 11/04: Arrangements of liquid pipes or hoses
- F02B 75/22: with cylinders in V, fan, or star arrangement
- F01P 2003/021: {Cooling cylinders}
- F01P 2003/024: {Cooling cylinder heads}
- F01P 2060/16: Outlet manifold
- F02B 2075/1824: {six}
- 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)

## Abstract

An internal combustion engine includes: an engine body; an exhaust pipe fastened to the engine body; an engine body cooling water passage provided in the engine body and having a cooling water injection port and a cooling water discharge port; an exhaust pipe cooling water passage provided in the exhaust pipe; a supply passage that connects the engine body cooling water passage with the exhaust pipe cooling water passage such that cooling water flows from the engine body cooling water passage to the exhaust pipe cooling water passage through the supply passage; and a return passage that connects the engine body cooling water passage with the exhaust pipe cooling water passage such that the cooling water flows from the exhaust pipe cooling water passage to the engine body cooling water passage through the return passage.

## Claims

### Claim 1

An internal combustion engine, comprising:
an engine body;
an exhaust pipe fastened to the engine body;
an engine body cooling water passage provided in the engine body and having a cooling water injection port and a cooling water discharge port;
an exhaust pipe cooling water passage provided in the exhaust pipe;
a supply passage that connects the engine body cooling water passage with the exhaust pipe cooling water passage such that cooling water flows from the engine body cooling water passage to the exhaust pipe cooling water passage through the supply passage; and
a return passage that connects the engine body cooling water passage with the exhaust pipe cooling water passage such that the cooling water flows from the exhaust pipe cooling water passage to the engine body cooling water passage through the return passage, wherein:
the supply passage is provided at a higher position than the cooling water injection port in a cylinder axis direction;
the return passage is provided at a higher position than the supply passage in the cylinder axis direction; and
the cooling water discharge port is provided at a higher position than the return passage in the cylinder axis direction.

### Claim 2 (depends on 1)

The internal combustion engine according to claim 1, wherein:
the engine body includes an engine body fastening part fastened to the exhaust pipe and at least one exhaust port opening out in the engine body fastening part;
the exhaust pipe includes an exhaust pipe fastening part fastened to the engine body and at least one exhaust branch passage that opens out in the exhaust pipe fastening part and is in communication with the at least one exhaust port;
the supply passage and the return passage are included in the engine body cooling water passage;
the supply passage and the return passage open out in the engine body fastening part; and
the exhaust pipe cooling water passage opens out in the exhaust pipe fastening part and is connected with the supply passage and the return passage.

### Claim 3 (depends on 2)

The internal combustion engine according to claim 2, wherein:
the at least one exhaust port includes a plurality of exhaust ports each opening out in the engine body fastening part;
the at least one exhaust branch passage includes a plurality of exhaust branch passages each opening out in the exhaust pipe fastening part and being in communication with a corresponding one of the exhaust ports;
the exhaust branch passages are arranged along a cylinder row direction;
the exhaust pipe includes an exhaust merging part for merging exhaust flowing through the plurality of exhaust branch passages; and
the exhaust merging part is provided between the exhaust pipe cooling water passage and the engine body.

### Claim 4 (depends on 3)

The internal combustion engine according to claim 3, wherein the exhaust pipe cooling water passage further includes at least one inter-branch cooling water passage between each pair of adjoining exhaust branch passages.

### Claim 5 (depends on 4)

The internal combustion engine according to claim 4, wherein the at least one inter-branch cooling water passage is configured to pass between the exhaust merging part and the engine body.

### Claim 6 (depends on 1)

The internal combustion engine according to claim 1, wherein the exhaust pipe has a vertically symmetrical shape.