# US 2009/0260588 A1 · Cylinder head

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- Number: US 2009/0260588 A1
- Document ID: US20090260588A1
- Status: Published application
- Kind: A1
- Application number: 12/275,054
- Filed: 2008-11-20
- Published: 2009-10-22
- Earliest claimed: 2008-04-21
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Soon Il Hong
- Web page: https://patentgrep.com/patent/US20090260588A1

## CPC

- F02F 1/40: cylinder heads with means for directing, guiding, or distributing liquid stream
- F01P 2003/028: {Cooling cylinders and cylinder heads in series}
- F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- 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)

## Abstract

A cylinder head having a coolant passage therein includes a coolant inlet, an exhaust valve seat portion, intake valve seat portion, and a spark plug mounting portion formed centrally in the cylinder head, wherein a guide rib is formed close to the coolant inlet for coolant to flow near the spark plug mounting portion along around the exhaust valve seat portion and a coolant outlet is disposed near to a corner of the intake valve seat portion.

## Claims

### Claim 1

A cylinder head having a coolant passage therein, comprising:
a coolant inlet;
an exhaust valve seat portion disposed near the coolant inlet;
a spark plug mounting portion disposed near the exhaust valve seat portion and formed substantially in a center portion of the cylinder head in a longitudinal direction thereof; and
a guide rib protruding from an inner circumference of the cylinder head and configured to be close to the exhaust valve seat portion for coolant to flow near the exhaust valve seat portion and the spark plug mounting portion.

### Claim 2 (depends on 1)

The cylinder head of claim 1, wherein the guide rib is disposed near to distal end portion of the coolant inlet.

### Claim 3 (depends on 1)

The cylinder head of claim 1, wherein the guide rib is disposed between a center line connecting the exhaust valve seat portions and the inner circumference of the cylinder head.

### Claim 4 (depends on 3)

The cylinder head of claim 3, wherein a plurality of the guide ribs are formed symmetrically with respect a line perpendicular to the center line connecting the centers of the exhaust valve seat portions.

### Claim 5 (depends on 1)

The cylinder head of claim 1, wherein the guide rib has a triangle-shaped cross-section.

### Claim 6 (depends on 1)

The cylinder head of claim 1, wherein the guide rib has a semi-circular cross-section.

### Claim 7 (depends on 1)

The cylinder head of claim 1, further comprises an intake valve seat portion disposed opposite the exhaust valve seat portion with respect to the spark plug mounting portion.

### Claim 8 (depends on 7)

The cylinder head of claim 7, wherein a coolant outlet is disposed between a center line of the intake valve seat portions and inner circumference of the cylinder head.

### Claim 9 (depends on 8)

The cylinder head of claim 8, wherein the coolant outlet is offset with a predetermined distance with respect to a line perpendicular to the center line connecting the centers of the intake valve seat portions.

### Claim 10 (depends on 7)

The cylinder head of claim 7, wherein an injector mounting portion is formed adjacent to the intake valve seat portion.

### Claim 11 (depends on 1)

An engine comprising the cylinder head of claim 1.

### Claim 12 (depends on 1)

A passenger vehicle comprising the engine of claim 1.