JPH1193770A - Intake passage structure for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake passage structure for an internal combustion engine with reliable sealing performance by using sealing members with the same quality and shape. SOLUTION: The same-shape recesses 3a are formed around both opening 31, 32 of an auxiliary intake port P2 in a cylinder head cover 3 and the same- shape sealing members 5 are fitted to the recesses 3a, so that sealing can be performed with the same-shape and -material sealing members 5 and sealing performance can be improved. As a die-cast cylinder head cover 3 can be used, no machining of a seal face is required, one type mold is required for molding the sealing members and one type material is required, thus reducing the cutting cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an intake passage structure for an internal combustion engine, and more particularly to an intake passage structure for an internal combustion engine having a cylinder head whose intake port is open upward.

[0002]

Conventionally, an intake port - an intake passage structure for an internal combustion engine E having a cylinder head 2 which bets P ₁ is open upwardly, as shown in FIG. 8, above the cylinder block 1,
Cylinder head 2 and the intake auxiliary port - sequentially superposed cylinder head cover -3 with bets P ₂ are integrally configured, furthermore, the auxiliary intake port - Above the bets P _2, Intel - Kumaniho - field 4 are connected. Then, in the joint surface between the cylinder head 2 and the cylinder head cover -3, rubber sheet - is interposed seal member 15 _1, 15 _3, also the cylinder head cover -3 and integrin - Kumaniho - the field 4 the bonding surface is interposed a gasket 15 _2. (See Japanese Patent Application Laid-Open No. 8-296446)

[0003]

[SUMMARY OF THE INVENTION However, the conventional sheet - the seal member, rubber sheet - sheet of seal member 15 ₁ and the gasket 15 ₂ - the shape of the seal member Despite the similarity, two the material and shape of different sheet - seal member is required, and usually, although the cylinder head cover -3 are often manufactured by die-casting, when using the gasket 15 _2, mechanical joints Need to finish by processing. Further, although the cylinder head cover 3 is made of a material such as an aluminum alloy, it is often thinner than the cylinder head 2 due to its thin shape, so that the cylinder head cover 3 holds the intake manifold. However, it is not easy to secure the sealability of the joint surface.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and uses a seal member of the same material and shape to ensure reliable sealability.
An object of the present invention is to provide an intake passage structure for an internal combustion engine that also ensures assemblability.

[0005]

According to the first aspect of the present invention,
An intake port mounted above a cylinder block of an internal combustion engine
A cylinder head having an upper opening, a cylinder head cover joined to the cylinder head and having an intake auxiliary port communicating with the intake port, and an interior joined to the intake auxiliary port. -In the intake passage structure of the internal combustion engine constituted by the
Forming a recess of the same shape around each of the openings of the
A seal member having the same shape is fitted in the recess.

According to a second aspect of the present invention, in the intake passage structure for an internal combustion engine according to the first aspect, a cylinder head cover is provided.
The seal member is formed of an elastic member having a convex portion corresponding to the concave portion.

According to a third aspect of the present invention, in the intake passage structure for an internal combustion engine according to the first aspect, the joint between the intake auxiliary port and the intake manifold is made rigid while deforming the seal member. It is characterized by being supported.

According to a fourth aspect of the present invention, there is provided an intake passage structure for an internal combustion engine according to the first aspect, wherein the joint between the intake auxiliary port and the intake manifold is provided with an intake port.
It is characterized in that the manifold is extended to one side of the internal combustion engine, and the pedestal on one side is formed higher than the pedestal on the other side.

According to a fifth aspect of the present invention, in the intake passage structure for an internal combustion engine according to the first aspect, first joining means for joining the intake manifold and the cylinder head cover, and the cylinder head The cover and the second joining means for joining the cylinder head are alternately arranged in the crankshaft direction.

[0010]

[Action] As shown in FIG. 1, an intake auxiliary ports of the cylinder head cover -3 - around each of the two openings 3 _1, 3 ₂ bets P ₂ a recess 3a of the same shape, the concave portion 3a By fitting the seal members 5 of the same shape, it becomes possible to seal with the seal members 5 of the same shape and material.
Since the seal performance is improved and the die-cast cylinder head cover-3 can be used, machining of the seal surface is not required.

A recess 3a is formed in the cylinder head cover-3.
Wherein provided on the opposite direction to each other sheet - by constructing an elastic member having a convex portion of the seal member 5 corresponding to the concave portion 3a, auxiliary intake port - DOO P ₂ and the intake port - junction between bets P ₁ Can be elastically supported, and noise and vibration can be reduced. Further, auxiliary intake port - DOO P ₂ and integrin - Kumaniho - the junction between the shield 4 - by which is rigid support while deforming the seal member 5, shea - can hold the balance between Le performance and dynamic performance.

Further, as shown in FIG.
Doo P ₂ and integrin - Kumaniho - at the junction of the shield 4, Intel - Kumaniho - forming higher than the other side of the base portion 4a of one side of the base portion 4b with extending the field 4 on the one side of the internal combustion engine it makes Intel - Kumaniho - remove interference tightening tool field 4 and the bolt 13 _2, it is possible to improve the workability.

Further, as shown in FIGS. 4 and 5,
First joining means for joining the intake manifold 4 and the cylinder head cover 3, and a cylinder head cover 3;
By disposing the second joining means for joining the cylinder head 2 and the cylinder head 2 alternately in the crankshaft direction, the seal balance of each joining surface can be properly maintained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the same members as those of the conventional example are denoted by the same reference numerals. As shown in FIG. 1, an intake passage structure of an internal combustion engine E according to the present invention includes a cylinder block 1 having a cylinder (not shown) therein.
Upwardly of the cylinder head 2 and the intake auxiliary port - constitute integral sequentially superposed cylinder head cover -3 with bets P _2, further wherein the auxiliary intake port - above the bets P ₂ are Intel -The manifold 4 is connected.
A rubber seal member 5 is interposed between the cylinder head cover 3 and the joint surface between the cylinder head 2 and the intake manifold 4.

[0015] Further, inside the cylinder head 2, an intake port is opened and closed by an intake valve 9 - and bets P _1, the exhaust port is opened and closed by an exhaust valve 10 - DOO P ₃ are formed, the intake port - DOO The upstream side of P ₁ has a shape that rises along the cylinder axis A while being curved, and is wider in the crank axis direction with respect to the cylinder axis A than the downstream side.
And is released in the same plane as the joint surface B-B of the cylinder head cover -3, The exhaust port - a downstream side of bets P ₃ includes an intake port - curved approximately 90 degrees in a direction away from the preparative P ₁ And is open to the side of the cylinder head. Note that two intake valves 9 and two exhaust valves 10 are provided for each cylinder.
Correspondingly, the intake port - DOO P ₁ and the exhaust port - DOO P ₃ is 2
They are formed one by one and partially merge. Further, an intake camshaft 1 for the intake valve 9 is provided on the joint surface BB.
1 and an exhaust camshaft 12 for the exhaust valve 10 are provided.
The cam caps 7 and 8 rotatably support the cam caps 7 and 8, respectively.

The cylinder head cover-3 is provided with the cover
Formed so as to cover the memory caps 7 and 8
Is the intake auxiliary port P_Two And plug auxiliary hole P_Four Is each
The shafts are formed so that their axial directions are almost parallel to each other.
Auxiliary port P_Two Lower opening 3 ₁ Intake port P₁ Contact with
As shown in FIG. 6, a concave groove 3a is formed at the joint.
And a convex seal member 5 fitted into the groove 3a.₁ (Figure
3), the intake port P₁ Upper end and intake auxiliary port
P_Two Lower end 3₁ Are sealed. Further
Next, the connection of the cylinder head cover-3 to the cylinder head 2 is performed.
In this case, as shown in FIG.
Cap bolt 13 to be joined to the pad 2 _Three Top of the
Cap nut 13 on the stud bolt_Four By screwing
The stud bolt part is used for the cylinder head cover.
3 as positioning means when covering the cylinder head 2
Also used. In addition, the intake auxiliary port P_Two Top 3 of_Two 
Is connected to the intake manifold 4.
At the joint, as shown in FIG._Two of
Lower opening 3₁ And the same concave groove 3a is formed.
A convex seal member 5 fitted into the groove 3a.₁ (See Figure 3
) By the intake auxiliary port P_Two Upper opening 3 of_Two And Inn
The space between the take manifolds 4 is sealed.

[0017] Next, as shown in FIGS. 2 and 4, Intel - Kumaniho - The field 4, auxiliary intake ports of each of the two cylinders - branch pipe 4 to be joined to the upper opening 3 ₂ bets P _{2 14
2} and between the plug assist ho - seat 13 of the ignition coil connected to Le P ₄ is provided, the branch pipe 4
_1, the seat 13 of the ignition coil, in the order of the branch pipes 4 _2, the number fraction of the cylinder is repeatedly arrayed. Also,
As shown in FIG. 2, plug assist e of the cylinder head cover -3 - Puraguho of the cylinder head 2 of the both opening portions of the Le P ₄ - the auxiliary intake port is at the junction of the seat 13 of the Le and ignition coil - DOO similar to P _2, concave grooves 3b are formed, convex sheet fitted to the groove 3b - seal member 5
₂ (see FIG. 3) seals each joint.

Then, as shown in FIG.
Has a substantially T-shaped cross section (see FIGS. 1 and 2),
a corresponds to the concave grooves 3a and 3b of the cylinder head cover-3.
The flange portions 5b are fitted to each other so that
3₁ , 3_Two And the intake port P ₁ And Inte Maniho
The clamp 4 is held between the joints. Also,
Two intake ports P of the seal member 5₁ Seal part 5₁ while
Has a plug auxiliary hole P_Four Plug seal part 5_Two Ga
Formed one after the other, thereby
-The screw member 5 is integrally formed, and furthermore, the
Linda is integrated.

Here, by making the seal member 5 an elastic member, the cylinder head 2 and the cylinder head cover-3 can be formed.
It becomes possible to support elastically between the members, so that noise and vibration can be reduced. Further, auxiliary intake port - upper opening 3 bets P ₂
The joint between the intake manifold ₂ and the intake manifold 4 is fastened with bolts 13 ₁ 13 ₂ (see FIG. 7) by bringing the joining surface other than the sealing surface into metallic contact while elastically deforming the sealing member 5. By doing so, rigidity is supported to achieve a balance between sealability and vibration performance. Also, since an excessive load is not applied to the seal member, the durability is improved.

As shown in FIG. 7, Intel - Kumaniho - auxiliary intake port of field 4 - Intel joined to the upper end 3 ₂ bets - Kumaniho - a certain amount than the other side 4a of the one side 4b of the base portion of the shield 4 L By forming it only as high as possible,
Integrated the field 4 when screwed into the cylinder head 2 by bolts 13 ₂ - Kumaniho - remove interference of the tool of field 4 and spanner or the like, the workability is improved. The fixed amount L is:
The height is set high enough not to cause interference between the intake manifold 4 and a tool such as a spanner. In particular, the intake manifold
The bolt 13 _2, which is an end of field 4 extending by a stud bolt, Intel - Kumaniho - Intel during assembling in cooperation with the high pedestal 4b of field 4 - Kumaniho -
The fall of the field can be prevented, and workability can be improved.

As shown in FIG. 4 and FIG.
Auxiliary port P_Two Lower opening 3₁ And intake port P₁ And the first
Flange portion 14 as joining means of 1₁ And the intake auxiliary port
To P _Two Upper opening 3 of_Two And of the INT Manifold 4
Flange part 14 as second joining means_Two And independent of each other
Formed at equal intervals in the crankshaft direction.
On the bolted part
The sealing property of the lower surface is made uniform. In addition, together with the recess
Both openings of the cylinder head cover
Connecting surface of the intake manifold and the cylinder head
It is also possible to provide on each of the joining surfaces of the metal.

[0022]

Effects of the Invention cylinder head cover - auxiliary intake port of the - both the openings 3 ₁ bets, 3 to form a recess of the same shape around the ₂ each, of the same shape in the recess sheet - fitting the seal member By doing so, it is possible to seal with a seal member of the same shape and material, and the sealing performance is improved, and a die-cast cylinder head cover can be used.
No machining of the seal surface is required, only one type of mold is required for forming the seal member, and only one type of material for the seal member is required, so that the cutting cost can be reduced.

Also, by providing the cylinder head cover with concave portions facing each other, the seal member is constituted by an elastic member having a convex portion corresponding to the concave portion.
The joint between the intake auxiliary port and the intake port can be elastically supported, so that vibration and noise can be reduced. Further, the joint between the intake auxiliary port and the intake manifold is rigidly supported while deforming the seal member, so that the balance between the sealability and the vibration performance can be maintained.

At the joint between the intake auxiliary port and the intake manifold, the intake manifold extends to one side of the internal combustion engine, and the pedestal on one side is separated from the pedestal on the other side. By forming it high, interference between the intake manifold and the bolt tightening tool is eliminated, and workability is improved. Further, the first joining means for joining the intake manifold and the cylinder head cover and the second joining means for joining the cylinder head cover and the cylinder head are alternately arranged in the crankshaft direction. Thereby, the seal balance of each joint surface can be properly maintained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of an intake passage structure of an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional side view of a plug hole portion of an intake passage structure of an internal combustion engine according to an embodiment of the present invention.

FIG. 3 is a perspective view of a seal member according to the embodiment of the present invention.

FIG. 4 is a top view of the intake passage structure of the internal combustion engine according to the embodiment of the present invention.

FIG. 5 is a top view of the cylinder head cover according to the embodiment of the present invention.

FIG. 6 is a bottom view of the cylinder head cover according to the embodiment of the present invention.

FIG. 7 is a sectional view taken along the line CC of FIG. 4;

FIG. 8 is a vertical sectional side view of an intake passage structure of an internal combustion engine according to a conventional example.

[Explanation of symbols]

1 a cylinder block 2 the cylinder head 3 a cylinder head cover - 4 integrin - Kumaniho - field 5 - seal member 7 intake side cam cap 8 exhaust cam cap 9 intake valve 10 exhaust valve 11 intake camshaft 12 the exhaust cam shaft P ₁ intake port - DOO P ₂ auxiliary intake port - DOO P ₃ exhaust port - DOO P ₄ plug assist ho - Le

Claims (5)

[Claims] A cylinder head mounted above a cylinder block of an internal combustion engine and opening an intake port upward;
A cylinder head cover joined to the cylinder head and having an intake auxiliary port communicating with the intake port;
In an intake passage structure for an internal combustion engine comprising an intake manifold joined to the intake auxiliary port, a recess having the same shape is formed around each of both openings of the intake auxiliary port. An intake passage structure for an internal combustion engine, wherein a seal member of the same shape is fitted in the recess. 2. The internal combustion engine according to claim 1, wherein concave portions are provided in the cylinder head cover in directions facing each other, and said seal member is constituted by an elastic member having a convex portion corresponding to said concave portion. Intake passage structure. 3. The intake passage structure for an internal combustion engine according to claim 1, wherein a joint between the intake auxiliary port and the intake manifold is rigidly supported while deforming a seal member. . 4. A joint between the intake auxiliary port and the intake manifold, wherein the intake manifold extends to one side of the internal combustion engine, and a pedestal on one side is replaced with a pedestal on the other side. The intake passage structure for an internal combustion engine according to claim 1, wherein the intake passage structure is formed higher. 5. A crankshaft comprising: first joining means for joining the intake manifold and the cylinder head cover; and second joining means for joining the cylinder head cover and the cylinder head. The intake passage structure for an internal combustion engine according to claim 1, wherein the intake passage structure is alternately arranged in the direction.