JPH09242600A - Cylinder head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the stay of water on an intake lead-in cylinder, and to prevent the intrusion of water into a combustion chamber in a cylinder head, in which a part of an intake port projected from one side surface of the cylinder head is formed of an intake lead-in cylinder part. SOLUTION: Plural intake lead-in cylinders 21a, 21b are projected from one side surface 1a of a cylinder head, and while a drain passage 22 passing through in the vertical direction is formed between the intake lead-in cylinder each end of these intake lead-in cylinder parts 21a, 21b is provided with integrated inner manifold connection flange 20 so as to flow down the water, which intruded onto the intake lead-in cylinder parts 21a, 21b, through the drain passage 22 along one side surface of the cylinder head, and intrusion of the water into a combustion chamber from a seal surface of an injector fitting part is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head, and more particularly to a cylinder head for a multi-cylinder in-line engine.

[0002]

2. Description of the Related Art Conventionally, for example, actual Kaihei 3-59453
As disclosed in Japanese Utility Model Publication No. 3-17245 and Japanese Utility Model Laid-Open No. 3-17245, in a multi-cylinder in-line engine, a portion of the intake port is part of the cylinder head in order to make the intake manifold mounting surface of the intake port upward from the vertical plane. It is known that the side wall is inclined obliquely upward and projected.

Referring to FIG. 6, 31 is a cylinder head, 32 is a combustion chamber, 33 is an intake port, 34 is an exhaust port, 35 is an intake valve, 36 is an exhaust valve, 37 is an intake valve and an exhaust valve. Is a spark plug, the intake port 33 is an ordinary curved intake port, and the intake manifold mounting surface 39 is one side surface 31a of the cylinder head 31.
Is formed so as to be obliquely outwardly inclined from above, and a part of the intake port 33 projects outward from one side surface 31a of the cylinder head 31. An exhaust manifold mounting surface of the exhaust port 34 is configured by the other side surface 31b of the cylinder head 31.

[0004]

By the way, when the width of the cylinder head is reduced while securing the required length of the intake port, the intake introducing cylinder portion having one or a plurality of intake ports formed therein is used as a cylinder. It is necessary to project from one side surface of the head, and to provide an intake manifold connecting flange at the tip thereof.

As described above, when the intake introducing cylinder portion forming a part of the intake port is projected from one side surface of the cylinder head, an upward concave portion is formed between the intake introducing cylinder portion and one side surface of the cylinder head. If the injector mounting part that injects fuel into the intake port is placed in this recess, the sealing surface of the injector will be immersed in water, and the water will mix into the combustion chamber through the sealing surface. There is a problem that may cause engine trouble.

In view of the above problems, the present invention provides a cylinder head in which water is prevented from entering the combustion chamber in the cylinder head in which the intake introducing cylinder portion projects from one side surface of the cylinder head. To aim.

[0007]

According to the present invention, in a cylinder head of a multi-cylinder in-line engine, an end portion of an intake port is projected outward from one side surface of the cylinder head, and the intake port is viewed from one side surface of the cylinder head. The protruding portion is composed of a plurality of intake introduction cylinder parts, and a drainage passage vertically passing along one side surface of the cylinder head is formed between the intake introduction cylinder parts, and the cylinders are formed at the ends of these intake introduction cylinder parts. By providing the integral intake manifold connecting flange along the arrangement direction, a recess is not formed between the intake introducing cylinder and one side surface of the cylinder head, and the water that has entered the intake introducing cylinder passes through the drainage passage to the cylinder. It flows down along one side surface of the head so that there is no risk of water mixing into the combustion chamber from the sealing surface of the mounting portion of the injector.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A cylinder head according to an embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a cylinder head of four in-line cylinders in an engine unit mounted on a vehicle in a slant posture, and a spark plug mounting hole 2 is provided at a substantially central position of each cylinder.
(See FIG. 2) is formed, and the lower end of the cylinder head 1 is formed.
Is opened to the combustion chamber 3 of each cylinder on the lower surface of the cylinder.
A pair of intake valve openings 4a and 4b are formed on the upper side of one side of each combustion chamber 3, and a pair of exhaust valve openings 5a and 5b are formed on the upper side of the other side (see FIG. 3).

The intake valve ports 4a and 4b are provided in the cylinder head 1.
Is connected to an intake port 6 extending toward one side, and the exhaust valve ports 5a and 5b communicate with an exhaust port 7 extending toward the other side of the cylinder head 1. A water cooling jacket portion 8 for cooling the upper portion of the combustion chamber 3 and the periphery of the intake port 6 and the exhaust port 7 is formed in the lower portion of the cylinder head 1, and an oil jacket portion 9 having an upper surface opening is formed in the upper portion thereof. The cylinder head cover is joined to the upper end surface of the.

A valve shaft hole 11 is formed in the lower wall 10 of the oil jacket portion 9 so as to correspond to each of the intake valve openings 4a and 4b and the exhaust valve openings 5a and 5b, and an appropriate through space 12 is formed above the valve shaft hole 11.
The respective valve mechanism supporting cylinder portions 13 are formed by opening the above, and are connected to the side wall 14 of the oil jacket portion 9 along the cylinder arrangement direction via the continuous portion 15. Further, on both sides of the spark plug mounting hole 2, there are camshaft bearing portions 16 that rotatably support a camshaft that drives the intake valve and the exhaust valve to open and close.
(See FIG. 2) is formed, and the through space 12 is also formed through the lower portion of the camshaft bearing portion 16.
In addition, a total of 1 at both ends of the cylinder row and both sides between each cylinder
A head bolt hole 1 for penetrating a head bolt for fixing the cylinder head 1 to the cylinder block is provided at 0 position.
7 is formed so as to penetrate the water cooling jacket portion 8 (see FIG. 4), and a seat 17a is formed on the upper surface of the lower wall 10 of the oil jacket portion 9.

When the cylinder head 1 is mounted in a slanting posture, as shown in FIGS. 2 to 4, the intake port 6 is mounted substantially vertically upward and the exhaust port 7 side is mounted downward. . Then, along the side wall 14 on the exhaust port 7 side, which is below the oil jacket portion 9,
An oil passage 18 shown by cross-hatching in FIGS. 2 to 4 is formed at a corner of the side wall 14 and the lower wall 10 or in the vicinity thereof.
The side wall 14 is formed so as to be inclined downward toward the oil passage 18 so that the oil passage 18 is at the lowest position. In addition, the oil passage 18 passes through a through space 12 that penetrates a lower portion of a cam shaft bearing portion 16 and a valve mechanism supporting cylinder portion 13 which are provided corresponding to each cylinder, and below the connecting portion 15 (FIG. 2, FIG. 3), head bolt hole 1
It is formed so as to be continuous across both ends of the cylinder head 1 through the side portion of the seat 17a of No. 7 (see FIG. 4). Then, one oil discharge hole 19 penetrating the lower surface of the cylinder head 1 is formed at one end of the oil passage 18.

Further, as shown in FIGS. 2 and 3, each intake port 6 is branched midway so as to communicate with the pair of intake valve openings 4a and 4b, and toward the intake valve openings 4a and 4b. It is configured by a straight port that extends substantially straight, and is configured such that the axis of the cylinder head 1 is oriented substantially vertically when the cylinder head 1 is in the slant position. The intake port 6 is provided on one side surface 1 of the cylinder head 1.
An integral intake manifold connecting flange 20 is disposed above the upper end of the cylinder "a" and is arranged at the upper end thereof in a horizontal state perpendicular to the axis along the cylinder arrangement direction. The intake manifold connecting flange 20 and the one side surface 1a of the cylinder head 1 are connected to each other by a pair of intake introducing cylinders 21a and 21b in which upper ends of a pair of intake ports 6 are formed inside. A drainage passage 22 is formed between 21a and 21b as shown in FIGS. Further, as shown in FIG. 5, a boss portion 23 is projected upward at the center of the upper surface of each intake introduction cylinder portion 21a, 21b, and a mounting screw 24 for fastening the intake manifold is formed. In addition,
Reference numeral 25 is an injector mounting hole formed in the upper surface of the intake introducing cylinders 20a, 20b so as to correspond to each intake port 6, and fuel is injected from the injector mounted in the injector mounting hole 25 toward each intake valve port 4a, 4b. Is jetted. Further, reference numeral 26 is a weight reducing recess formed in the intake manifold connecting flange 20.

In the above-mentioned structure, the intake port 6 is a straight port projecting upward from one side surface of the slanted cylinder head 1 and substantially vertically, and an intake manifold is connected to the upper end of the straight port perpendicularly to the axis of the intake port 6. Since the flange 20 is formed, when the surge tank and the intake manifold are arranged above the cylinder head 1, the intake manifold can be connected to the intake manifold connecting flange 20 without complicatedly bending the branch pipe of the intake manifold. Intake loss due to bending of the pipe does not occur, and since the intake port 6 composed of a straight port has a sufficient length, it is possible to form a tumble flow with high intake charging efficiency and effectively, and to perform combustion. The efficiency can be increased.

The portion of the intake port 6 projecting from the one side surface 1a of the cylinder head 1 is composed of a pair of intake introduction cylinders 21a and 21b having a pair of intake ports 6 and each intake introduction cylinders 21a and 21b. Since the boss portion 23 is projected at the center of the upper surface of the and the drainage passage 22 is formed between the intake introduction cylinder portions 21a and 21b, the intake introduction cylinder portion 21
The water that has entered the a and 21b flows on both sides as shown by the arrow in FIG. 5, and flows down along the cylinder head one side surface 1a through the drainage passage 22 between the intake introduction cylinders 21a and 21b. . Therefore, there is no possibility that water will mix into the combustion chamber from the seal surface of the injector mounting portion, and water will not mix into the combustion chamber and cause engine trouble.

Further, since the oil supplied to the cam mechanism in the oil jacket portion 9 flows toward the lower portion in the oil jacket portion 9, the oil passage 1 at the lowest position is provided.
8 and flows through the oil passage 18 toward one end of the cylinder head 1, and is smoothly discharged from the oil discharge hole 19 without generating an oil reservoir. Further, since the oil passage 18 is formed of a material shape, it is not necessary to perform drill hole processing later, and since the discharge hole that vertically penetrates is not formed in the material shape, deburring processing is also necessary. Since it is not, it can be constructed inexpensively.

Although an example of a slant engine has been shown in the above embodiment, the same effect can be obtained by applying the present invention to an upright engine, and an example in which the intake port is a straight port is shown. The same effect can be obtained even when applied to an engine having a curved intake port.

[0018]

According to the cylinder head of the present invention, the portion of the intake port projecting from one side surface of the cylinder head is constituted by a plurality of intake introducing cylinder portions, and one side surface of the cylinder head is provided between the intake introducing cylinder portions. Since a drain passage that penetrates up and down along the is formed, a recess is not formed between the intake introduction cylinder and one side of the cylinder head, and water that has entered the intake introduction cylinder does not pass through the drain passage. It is possible to allow the water to flow downward along one side surface of the cylinder head, water is not mixed into the combustion chamber from the seal surface of the mounting portion of the injector, and the risk of engine trouble can be eliminated.

[Brief description of drawings]

FIG. 1 shows an embodiment of a cylinder head of the present invention,
It is a top view of a cylinder head in a state where a cylinder axis is vertical.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 in a slant position.

FIG. 3 is a sectional view taken along the line BB of FIG. 1 in a slant position.

FIG. 4 is a sectional view taken along the line CC of FIG. 1 in a slant position.

FIG. 5: D- in FIG. 1 with the cylinder axis vertically
It is an arrow D view.

FIG. 6 is a cross-sectional view of a conventional cylinder head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head 1a One side surface 6 Intake port 20 Manifold connection flange 21a Intake introduction cylinder part 21b Intake introduction cylinder part 22 Drain passage

Claims (1)

[Claims] 1. In a cylinder head of a multi-cylinder in-line engine, an end of an intake port is projected outward from one side surface of the cylinder head, and a portion of the intake port projected from one side surface of the cylinder head is introduced into a plurality of intakes. A drain passage is formed between the cylinders and vertically penetrates along one side surface of the cylinder head between the intake introduction cylinders, and an intake manifold integrated along the cylinder arrangement direction is formed at the ends of the intake introduction cylinders. A cylinder head having a connection flange.