Quantcast

Cylinder head structure in multi-cylinder engine

Imported: 24 Feb '17 | Published: 06 Jan '04

Yasutoshi Ito, Sadao Kojima, Teruo Kobayashi, Masakatsu Honda, Shinji Yamada, Masaki Kanehiro, Naohiro Isogai

USPTO - Utility Patents

Abstract

A collecting exhaust port

18 provided in a cylinder head

12 is comprised of exhaust port sections

46 extending from exhaust valve bores

35 in cylinders

14, and an exhaust collecting section

47 in which the exhaust port sections

46 are collected. The cylinder head

12 includes a protrusion

49 projecting in an arch shape outside a side wall

11

1 of a cylinder block

11. The exhaust collecting section

47 of the collecting exhaust port

18 directly faces an inner surface of a side wall

12 of the protrusion

49. Water jackets J

2 and J

3 for cooling the protrusion

49 are provided in upper and lower surfaces of the protrusion

49 having the collecting exhaust port

18 defined therein. The water jackets J

2 and J

3 are not provided between the side wall

12

1 of the protrusion

49 and the exhaust collecting section

47. Thus, the compact cylinder head

12 having the collecting exhaust port

18 integrally provided therein can be formed, while avoiding the complication of the structure of a core.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 to

6 show a first embodiment of the present invention, wherein

FIG. 1 is a vertical sectional view of a head portion of an engine;

FIG. 2 is a sectional view taken along a line

2

2 in FIG. 1;

FIG. 3 is a sectional view taken along a line

3

3 in FIG. 2;

FIG. 4 is a sectional view taken along a line

4

4 in FIG. 2;

FIG. 5 is a view taken in the direction of an arrow

5 in FIG. 2;

FIG. 6 is a sectional view taken along a line

6

6 in FIG. 5;

FIGS. 7 to

9 show a second embodiment of the present invention, wherein

FIG. 7 is a view similar to FIG. 2, but according to the second embodiment;

FIG. 8 is a sectional view taken along a line

8

8 in FIG. 7;

FIG. 9 is a sectional view of a mold forming a sand core;

FIG. 10 is a view similar to FIG. 2, but according to a third embodiment of the present invention;

FIG. 11 is a view similar to FIG. 2, but according to a fourth embodiment of the present invention;

FIG. 12 is a vertical sectional view of an engine according to a fifth embodiment of the present invention;

FIGS. 13 and 14 show a sixth embodiment of the present invention; FIG. 13 being a view similar to FIG. 2, and FIG. 14 being a view taken in the direction of an arrow

14 in FIG. 13;

FIG. 15 is a view similar to FIG. 2, but according to a seventh embodiment of the present invention;

FIGS. 16 to

18 show an eighth embodiment of the present invention, wherein

FIG. 16 is a vertical sectional view of an engine;

FIG. 17 is a view taken in the direction of an arrow

17 in FIG. 16;

FIG. 18 is a sectional view taken along a line

18

18 in FIG. 17;

FIGS. 19 and 20 show a ninth embodiment of the present invention, FIG. 19 being a view similar to FIG. 2, and FIG. 20 being a view taken in the direction of an arrow

20 in FIG. 19;

FIG. 21 is a sectional view taken along a line

21

21 in FIG. 20;

FIGS. 22 and 23 show a tenth embodiment of the present invention, FIG. 22 being a view similar to FIG. 2, and FIG. 23 being a view taken in the direction of an arrow

23 in FIG.

22.

Claims

1. A multi-cylinder engine comprising a collecting exhaust port which includes a plurality of exhaust port sections extending from a plurality of combustion chambers arranged along a cylinder array, said plurality of exhaust port sections being integrally collected together into an exhaust collecting section defined within a cylinder head, wherein an oxygen concentration sensor for detecting a concentration of oxygen in an exhaust gas is mounted on said cylinder head so as to have a detecting portion thereof disposed to face the exhaust collecting section.

2. A multi-cylinder engine comprising a collecting exhaust port which includes a plurality of exhaust port sections extending from a plurality of combustion chambers arranged along a cylinder array, said plurality of exhaust port sections being integrally collected together into an exhaust collecting section defined within a cylinder head, wherein a protrusion is formed to project outwardly in an arch shape from a side surface of the cylinder head, and an oxygen concentration sensor for detecting a concentration of oxygen in an exhaust gas is mounted so as to have a detecting portion thereof disposed to face the exhaust collecting section and a body portion thereof opposed to a side wall of said protrusion.

3. A multi-cylinder engine according to claim 2, wherein said oxygen concentration sensor is mounted in the vicinity of an exhaust outlet defined at an outer end of the protrusion of the cylinder head, said body portion of the oxygen concentration sensor being fixed in the vicinity of the exhaust outlet disposed parallel to the cylinder array, said detecting portion being provided at a tip end of the body portion, and the oxygen concentration sensor further includes a harness extending from a rear end of the body portion.

4. A multi-cylinder engine according to claim 3, wherein dead spaces are defined on opposite sides of the protrusion in the direction of the cylinder array and the oxygen concentration sensor is disposed in one of the dead spaces such that the body portion is gradually spaced apart from the side wall of the protrusion.

5. A multi-cylinder engine according to claim 2, wherein a chamber is provided for accommodating a driving device for a cam of the engine, and the oxygen concentration sensor is disposed on an opposite side from said chamber.

6. A multi-cylinder engine comprising a collecting exhaust port which includes a plurality of exhaust port sections extending from a plurality of combustion chambers arranged alone a cylinder array, said plurality of exhaust port sections being Integrally collected together into an exhaust collecting section defined within a cylinder head, wherein an oxygen concentration sensor for detecting a concentration of oxygen in an exhaust gas is mounted so as to have a detecting portion thereof disposed to face the exhaust collecting section,

7. A multi-cylinder engine according to claim 6, wherein a protrusion is formed to project outwardly in an arch shape from a side surface of the cylinder head.

8. A multi-cylinder engine according to claim 6, wherein said oxygen concentration sensor is mounted in the vicinity of an exhaust outlet defined at an outer end of the protrusion of the cylinder head, a body portion of the oxygen concentration sensor is fixed in the vicinity of the exhaust outlet disposed parallel to the cylinder array, and said detecting portion being provided at a tip end of the body portion.

9. A multi-cylinder engine according to claim 8, wherein the oxygen concentration sensor further includes a harness extending from a rear end of the body portion.

10. A multi-cylinder engine according to claim 8, wherein dead spaces are defined on opposite sides of the protrusion in the direction of the cylinder array and the oxygen concentration sensor is disposed in one of the dead spaces such that the body portion is gradually spaced apart from the side wall of the protrusion.