CYLINDER HEAD

• US 20200132013A1
• Filed: 09/16/2019
• Published: 04/30/2020
• Est. Priority Date: 10/29/2018
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: YARINO, Motonari
• Granted Patent: US 10,914,265 B2
• Time in Patent Office: Days
• CPC Class Codes: F02B 2075/1816 four
• CPC Class Codes: F02F 1/40 cylinder heads with means for directing, guiding, or distributing liquid stream
• CPC Class Codes: F02F 1/4214 specially adapted for four or more valves per cylinder
• CPC Class Codes: F02F 1/4235 of intake channels

Abstract

In a cylinder head according to an example of the present disclosure, a pair of intake ports communicating with the common combustion chamber are formed so that the wall thickness of the port walls on opposing sides is relatively small and the wall thickness of the port walls on reversing sides is relatively large. Herein, the opposing side is the side on which the port walls of the pair of the intake ports face each other. The reversing side is the side opposite to the opposing side. That is, the reversing side is the side on which the port walls of the pair of the intake ports face away from each other. An inter-ports flow path for flowing the cooling water is formed between the port walls on the opposing sides of the pair of the intake ports.

Claims

1. A cylinder head of an internal combustion engine comprising:

a pair of intake ports communicating with a combustion chamber; and

an inter-ports flow path for flowing cooling water formed between port walls on opposing sides of the pair of the intake ports, wherein,

wall thickness of the port walls on the opposing sides is thinner than wall thickness of the port walls on reversing side of the pair of the intake ports,

the opposing side is the side on which the port walls of the pair of the intake ports face each other, and

the reversing side is the side opposite to the opposing side and is the side on which the port walls of the pair of the intake ports face away from each other.

2. The cylinder head according to claim 1, wherein

the pair of the intake ports are parts of an intake passage into which the intake passage bifurcates in the cylinder head, and

the inter-ports flow path is formed in a gap between a crotch at which the intake passage bifurcates into the pair of the intake ports and the combustion chamber).

3. The cylinder head according to claim 1, wherein the wall thickness of the each port wall gradually increases from the opposing side to the reversing side.

4. The cylinder head according to claim 1, further comprising:

an injector insertion hole provided between the pair of the intake ports and the cylinder block mating surface and communicating with the combustion chamber; and

a communication passage for introducing the cooling water into the inter-ports flow path formed between the pair of the intake ports and the injector insertion hole, wherein

wall thickness of a hole wall of the injector insertion hole on the side facing the pair of the intake ports is thinner than the wall thickness of the hole wall of the injector insertion hole on the side facing away from the pair of the intake ports.