CYLINDER HEAD

• US 20200132015A1
• Filed: 10/29/2018
• Published: 04/30/2020
• Est. Priority Date: 10/29/2018
• Status: Active Grant

• Current Assignee: Komatsu Ltd.
• Original Assignee: Komatsu Ltd.
• Inventors: Kageyama, Yuuki
• Granted Patent: US 10,968,861 B2
• Time in Patent Office: Days
• CPC Class Codes: F01L 1/18 Rocking arms or levers
• CPC Class Codes: F01M 11/02 Arrangements of lubricant conduits
• CPC Class Codes: F01M 9/101 of cam surfaces
• CPC Class Codes: F01M 9/107 of rocker shaft bearings
• CPC Class Codes: F01P 3/02 Arrangements for cooling cylinders or cylinder heads
• CPC Class Codes: F02B 31/04 by means within the induction channel, e.g. deflectors
• CPC Class Codes: F02F 1/242 Arrangement of spark plugs or injectors
• CPC Class Codes: F02F 1/243 Cylinder heads and inlet or exhaust manifolds integrally cast together
• CPC Class Codes: F02F 1/36 for liquid cooling
• CPC Class Codes: F02F 1/38 the cylinder heads being of overhead valve type
• CPC Class Codes: F02F 1/4285 of both intake and exhaust channel
• CPC Class Codes: F02F 2001/244 Arrangement of valve stems in cylinder heads
• CPC Class Codes: F02M 35/10288 Air intakes combined with another engine part, e.g. cylinder head cover or being cast in one piece with the exhaust manifold, cylinder head or engine block
• CPC Class Codes: F02M 35/104 Intake manifolds
• CPC Class Codes: F02M 37/0052 Details on the fuel return circuit; Arrangement of pressure regulators
• CPC Class Codes: F02M 55/02 Conduits between injection pumps and injectors , e.g. conduits between pump and common-rail or conduits between common-rail and injectors

Abstract

The cylinder head includes an intake port communicating with a cylinder of a cylinder block, a cylinder head main body having an exhaust port communicating with the cylinder, and a rocker housing integrally formed on the cylinder head main body and an inner side of which is defined as a valve-system accommodating space. The rocker housing includes a lateral wall having a lateral wall main body and a base end portion which extends along a lower end of the lateral wall main body, connects the lateral wall main body to the cylinder head main body, and has a thickness thicker than that of the lateral wall body. A flow path which extends in an extending direction of the base end portion and through which a fluid flow is formed in the base end portion.

Claims

1. A cylinder head comprising:

a cylinder head main body having an intake port communicating with a cylinder of a cylinder block and an exhaust port communicating with the cylinder; and

a rocker housing integrally formed on the cylinder head main body and an inner side of which is a valve-system accommodating space,

wherein the rocker housing includes

a lateral wall having a lateral wall main body and a base end portion that extends along a lower end of the lateral wall main body, connects the lateral wall main body to the cylinder head main body, and has a thickness thicker than that of the lateral wall main body, and

wherein a flow path extending in an extending direction of the base end portion and through which a fluid flows is formed in the base end portion.

2. The cylinder head according to claim 1,

wherein the fluid is a fuel or a lubricating oil.

3. The cylinder head according to claim 1,

wherein a plurality of the cylinders arranged in the cylinder block,

the intake port and the exhaust port communicate with each of the cylinders, and

the lateral wall and the flow path extend in a cylinder arranged direction that is an arrangement direction of the cylinders.

4. The cylinder head according to claim 3,

wherein each intake port is formed so as to intake air from an intake side which is one side of an orthogonal direction orthogonal to the cylinder arranged direction,

wherein the rocker housing has an intake-side lateral wall disposed on the intake side as the lateral wall, and

wherein as the flow path, a fuel return flow path through which a fuel flows is formed in the base end portion of the intake-side lateral wall, wherein the fuel has returned from a plurality of fuel injectors that are arranged so as to inject fuel into each cylinders.

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

an intake manifold integrally formed on the intake side of the cylinder head main body and extending in the cylinder arranged direction so as to be connected to each intake port,

wherein a connecting flow path extending from each fuel injector to the fuel return flow path is formed in the cylinder head main body, and

the connecting flow path extends while inclining upward from each fuel injector toward the intake side so as to pass between the valve-system accommodating space and an internal space of the intake port and the intake manifold communicating with the intake port.

6. The cylinder head according to claim 3,

wherein each exhaust port is formed so as to be exhausted to an exhaust side, which is the other side of an orthogonal direction orthogonal to the cylinder arranged direction,

wherein the rocker housing has an exhaust-side lateral wall disposed on the exhaust side as the lateral wall, and

wherein as the flow path, a lubricating oil flow path through which a lubricating oil supplied to the valve-system component flows is formed in the base end portion of the exhaust-side lateral wall.

7. The cylinder head according to claim 2,

wherein a plurality of the cylinders arranged in the cylinder block,

the intake port and the exhaust port communicate with each of the cylinders, and

the lateral wall and the flow path extend in a cylinder arranged direction that is an arrangement direction of the cylinders.

8. The cylinder head according to claim 7,

wherein each intake port is formed so as to intake air from an intake side which is one side of an orthogonal direction orthogonal to the cylinder arranged direction,

wherein the rocker housing has an intake-side lateral wall disposed on the intake side as the lateral wall, and

wherein as the flow path, a fuel return flow path through which a fuel flows is formed in the base end portion of the intake-side lateral wall, wherein the fuel has returned from a plurality of fuel injectors that are arranged so as to inject fuel into each cylinders.

9. The cylinder head according to claim 8, further comprising:

an intake manifold integrally formed on the intake side of the cylinder head main body and extending in the cylinder arranged direction so as to be connected to each intake port,

wherein a connecting flow path extending from each fuel injector to the fuel return flow path is formed in the cylinder head main body, and

the connecting flow path extends while inclining upward from each fuel injector toward the intake side so as to pass between the valve-system accommodating space and an internal space of the intake port and the intake manifold communicating with the intake port.

10. The cylinder head according to claim 4,

wherein each exhaust port is formed so as to be exhausted to an exhaust side, which is the other side of an orthogonal direction orthogonal to the cylinder arranged direction,

wherein the rocker housing has an exhaust-side lateral wall disposed on the exhaust side as the lateral wall, and

wherein as the flow path, a lubricating oil flow path through which a lubricating oil supplied to the valve-system component flows is formed in the base end portion of the exhaust-side lateral wall.

11. The cylinder head according to claim 5,

wherein each exhaust port is formed so as to be exhausted to an exhaust side, which is the other side of an orthogonal direction orthogonal to the cylinder arranged direction,

wherein the rocker housing has an exhaust-side lateral wall disposed on the exhaust side as the lateral wall, and

wherein as the flow path, a lubricating oil flow path through which a lubricating oil supplied to the valve-system component flows is formed in the base end portion of the exhaust-side lateral wall.

12. The cylinder head according to claim 7,

wherein each exhaust port is formed so as to be exhausted to an exhaust side, which is the other side of an orthogonal direction orthogonal to the cylinder arranged direction,

wherein the rocker housing has an exhaust-side lateral wall disposed on the exhaust side as the lateral wall, and

wherein as the flow path, a lubricating oil flow path through which a lubricating oil supplied to the valve-system component flows is formed in the base end portion of the exhaust-side lateral wall.

13. The cylinder head according to claim 8,

wherein each exhaust port is formed so as to be exhausted to an exhaust side, which is the other side of an orthogonal direction orthogonal to the cylinder arranged direction,

wherein the rocker housing has an exhaust-side lateral wall disposed on the exhaust side as the lateral wall, and

wherein as the flow path, a lubricating oil flow path through which a lubricating oil supplied to the valve-system component flows is formed in the base end portion of the exhaust-side lateral wall.

14. The cylinder head according to claim 9,

wherein each exhaust port is formed so as to be exhausted to an exhaust side, which is the other side of an orthogonal direction orthogonal to the cylinder arranged direction,

wherein the rocker housing has an exhaust-side lateral wall disposed on the exhaust side as the lateral wall, and

wherein as the flow path, a lubricating oil flow path through which a lubricating oil supplied to the valve-system component flows is formed in the base end portion of the exhaust-side lateral wall.