JP2001280205A - Engine intake device mounting structure - Google Patents

Abstract

(57) [Problem] To provide a mounting structure of an intake device for an engine, to which an intake device having a different arrangement of insertion holes can be mounted without changing a screw arrangement of a cylinder head. A first intake passage formed in a cylinder head of an engine and a second intake passage formed in an intake device.
A communication passage 2b communicating with the intake passage 3b, a first insertion hole 2f through which a first bolt 4 screwed with a first female screw portion 1f provided in the cylinder head 1, and a first bolt 2g forming the seating surface of the cylinder head 4 and the cylinder head 1
And a second insertion hole 2 e through which a second bolt 6 screwed with a second female screw portion 1 e provided in the suction device 3 is inserted together with a third insertion hole 3 e formed in the suction device 3. The cylinder head 1 and the intake device 3 are attached via the spacer 2 provided with the third female screw 2h screwed with the third bolt 5 inserted into the fourth insertion hole 3h. .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure between an engine cylinder head and an intake device.

[0002]

2. Description of the Related Art Conventionally, when an intake device is mounted on a cylinder head provided as a component constituting an intake passage of an engine, a female screw is inserted into the cylinder head and a male screw is inserted into the intake device. And place each
It is common to use a method in which a male screw (bolt) is inserted into the insertion hole of the intake device and attached. The arrangement of the female screw provided in this cylinder head is such that the gasket inserted between the cylinder head and the intake device has a sealing property, various air passages of the cylinder head and the screw holes,
It is determined in consideration of the attachment of the intake device.

[0003]

In general, a cylinder head of an engine not only constitutes a combustion chamber of each cylinder and an intake passage to the combustion chamber, but also a cooling water passage of the combustion chamber and intake and exhaust of each cylinder. Since the valve mechanism, the mounting portion of the ignition plug, the pit for engine oil, and the like are arranged, the internal structure is very complicated. For this reason, it is very difficult to change the arrangement of the female screw for fastening the intake device.

For example, in order to improve the output performance of the engine, it is common practice to adjust the length of the intake passage and the diameter of the intake passage when improving the engine (model change). . In general, when improving an engine, it is desirable to continue using existing products that have been used so far for cylinder heads and the like that require a large capital investment due to cost problems. In such a case, it is necessary to use the existing product arrangement as it is for the arrangement of screws for mounting. For this reason, even if the optimal specifications of the intake passage are found, the arrangement of the screws for attaching the cylinder head and the intake device is restricted, so that it cannot be often adopted.

In addition, in recent years, a space-saving intake system component in which various components constituting an intake system called an intake system module are assembled has been proposed. In this intake system module, in order to collect various components in a compact manner, it is difficult to take up a space for mounting to the cylinder head, particularly, a space for inserting bolts (such as mounting parts) and mounting tools. Therefore, the change to the intake system module causes a problem that the mountability of the intake system components to the cylinder head is further deteriorated. Also, in such a space-saving intake system module, if an attempt is made to secure a mounting space between the cylinder head and the intake device, it may be necessary to forcibly curve the intake port of the intake device, It is expected that the output performance of the engine will be adversely affected. Also, as described above, in order to use the existing parts (cylinder head), it is necessary to match the screw arrangement of the intake system module with the screw arrangement of the existing product.
Replacement of parts is very difficult.

[0006] Alternatively, a resin-made air intake device, which has been widely used in recent years, uses a rib-like structure (referred to as a welding rib) in which a part of the pieces is melted and joined in order to join the pieces. ing. For this reason, even if an attempt is made to attach a resin-made intake device having the same shape as an existing intake passage to an existing cylinder head, there may be a problem that a mounting space cannot be secured due to a welding rib. In such a case, it is necessary to make the welding rib thinner, move the position from an optimum position for joining, or change the shape of the intake passage, thereby lowering the strength of the intake device and reducing the engine output. There is a risk of causing a problem such as a decrease in performance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a mounting structure of an intake device for an engine in which an intake device having a different arrangement of insertion holes can be mounted without changing a screw arrangement of a cylinder head. I do.

[0008]

The technical measures taken in the present invention to solve the above-mentioned problems include a first intake passage formed in a cylinder head of an engine, and a first intake passage formed in an intake device of the engine. A communication passage for communicating a second intake passage to be formed, a first insertion hole for inserting a first bolt screwed into a first female screw portion provided in the cylinder head, A concave portion forming a seat surface, and a second insertion hole through which a second bolt screwed with a second female screw portion provided in the cylinder head is inserted together with a third insertion hole formed in the intake device. Attaching the cylinder head and the intake device via a spacer provided with a third female screw portion screwed with a third bolt inserted into a fourth insertion hole provided in the intake device. That's what we did.

Thus, the position of the female screw portion of the spacer and the suction device and the position of the insertion hole can be determined regardless of the position of the female screw portion of the cylinder head. Engine performance can be improved, strength can be secured, and parts can be shared.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described with reference to the drawings.

FIG. 1 is an overall view showing an intake device of an engine and a mounting flange of a cylinder head.

In FIG. 1, an intake device 3 is mounted on a mounting flange 1 a provided on a cylinder head 1 via a spacer 2. The cylinder head 1 has an intake passage (first intake passage) 1b communicating with a combustion chamber 1c of the engine, and the intake device 3 has an intake passage (second intake passage) 3b communicating with an open end on the atmosphere side. Is formed. The two intake passages are communicated by a communicating portion 2b formed in the spacer 2, and the communicating portion 2b forms an intake passage between the first intake passage 1b and the second intake passage 2b.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, showing the shape of the mounting flange of the cylinder head.

In FIG. 2, a first female thread portion 1f for fastening a spacer (not shown) to the cylinder head is mounted on a mounting flange 1a of the cylinder head 1, and an intake device (not shown) is mounted via a spacer (not shown). Second
And the intake passages 1b of the cylinder head 1 are formed. A distance G in the cylinder direction of the engine of the cylinder head 1 with respect to the second female screw portion 1d.
The second female screw portion 1e is provided at a position separated by a distance H, and the first female screw portion 1f is provided at a position separated by a distance H.

FIG. 3 is a sectional view taken along the line BB of FIG. 1 and shows a sectional shape of the spacer according to the present invention.

In FIG. 3, the spacer 2 has second insertion holes 2d and 2e for inserting a second bolt (not shown) for mounting an intake device (not shown) to a cylinder head (not shown) via the spacer 2, and a spacer. First bolt 4 for attaching 2 to a cylinder head (not shown)
Are formed, a first insertion hole 2f through which the first bolt 4 is inserted, an opening (first opening) 2c to the cylinder head, and a concave portion 2g forming a seating surface of the first bolt 4. The recess 2g is
It has a diameter larger than the outer shape of the first bolt 4 and the tool to which the first bolt 4 is attached, and is formed by being drilled toward the cylinder head (not shown) beyond the intake device attachment surface (not shown) of the spacer 2. . The second insertion hole 2d is positioned at a position separated by a distance G in the longitudinal direction of the spacer 2 with respect to the second insertion hole 2d.
The first insertion hole 2f is disposed at a position where the insertion hole 2e is separated by a distance H, and the first insertion hole is formed by a first female screw portion of a cylinder head (not shown) and a second insertion hole. Have the same center positions as the second female screw portions.

FIG. 4 is a cross-sectional view taken along the line CC of FIG. 1 and shows the shape of the intake device mounting surface of the spacer.

In FIG. 4, the spacer 2 has second through holes 2d and 2d through which a second bolt (not shown) for mounting a cylinder head (not shown) is inserted.
e, a communication portion 2b forming an intake passage, and a third female screw portion 2h for attaching an intake device (not shown) to the spacer 2. The third female screw portion 2h is
Is formed at a position separated by a distance J with respect to the insertion hole 2d.

FIG. 5 is a view showing a bolt mounting seat surface of a flange of the intake device, as viewed from an arrow D in FIG.

In FIG. 5, the intake device 3 has a flange 3
a and an intake passage 3b. Flange 3a
Have third insertion holes 3d, 3e through which the second bolts 6 screwed with the second female screws (not shown) of the cylinder head are inserted.
And a fourth insertion hole 3h through which a third bolt 5 screwed with a third female screw provided in a spacer (not shown) is inserted. With reference to the second insertion hole 3d, a second insertion hole 3e is formed at a position separated by a distance G, and a fourth insertion hole 3h is formed at a position separated by a distance J.

FIG. 6 is a cross-sectional view taken along line FF of FIG.

In FIG. 6, a first female screw portion 1f provided in the cylinder head 1 is screwed by a first bolt 4 inserted through a first insertion hole 2f provided in the spacer 2, and the first female screw portion 1f is screwed into the first female screw portion 1f. The bearing surface of the bolt 4 is in contact with the recess 2 g to fasten the cylinder head 1 and the spacer 2. At this time,
The head 4a of the first bolt 4 does not protrude from the intake device mounting surface 2c of the spacer 2 due to the concave portion 2g formed by drilling from the intake device mounting surface 2c of the intake device 3 toward the cylinder head 1. The intake device 3 is formed so as to be attached to the spacer 2. A third female screw 2h formed near the recess 2g has a flange 3a
A third bolt 5 inserted into the fourth insertion hole 3h is screwed into the second engagement hole to fasten the intake device 3 and the spacer 2. on the other hand,
A second female screw portion 1e provided in the cylinder head has a second insertion hole 2e provided in the spacer 2 and an intake device 3
The second inserted through both of the third insertion holes 3e provided in the
Of the cylinder head 1 and the intake device 3
Are fastened via a spacer 2. Further, the first intake passage 1b and the second intake passage 3b are communicated by a communication portion 2b provided in the spacer 2.

Here, the operation of the spacer according to the present invention will be described with reference to FIGS.

As shown in FIG. 5, the second intake passage 3b formed in the intake device 3 is formed to be curved from an opening formed in the flange 3a of the intake device 3. Thus, the first bolt 4 screwed into the first female screw portion 1f formed in the cylinder head 1 cannot be tightened due to the presence of the intake passage 3b. Therefore, as shown in FIG. 4, a third female screw portion 2h is newly provided in the spacer 2, and the third bolt 5 is inserted through the fourth insertion hole 3h shown in FIG. Thereby, the intake device 3 is fastened to the spacer 2. As shown in FIG. 3 and FIG. 6, the spacer 2 and the cylinder head 1
And the first female screw portion 1f shown in FIG. 1 are screwed and fastened. As a result, the cylinder head 1 and the intake device are fastened without using the second female screw portion of the cylinder head 1, and the cylinder head 1 and the intake device 3 having different screw arrangements can be attached, It is advantageous.

The spacer 2 is provided with an exhaust gas recirculation gas passage, a crankcase ventilation gas passage, and the like.
It is also possible to provide a distribution path for distributing to each cylinder.

[0026]

As described above, according to the first aspect of the present invention, the arrangement of the insertion holes provided in the intake device is made irrespective of the arrangement of the female screw portion for mounting the intake device provided in the cylinder head. Can be arranged freely. This increases the degree of freedom of the shape of the intake port of the intake device,
It is possible to configure an intake passage having an optimum length and a diameter with a priority on the output performance of the engine. In addition, since it can be used without changing the arrangement of the mounting screws of the existing parts, it is also possible to achieve commonality of parts and reduce equipment costs. Also, under the influence of welding ribs,
Because the space for tightening is not enough, the intake device made of resin material, which changed the shape of the intake passage, can be attached to the existing cylinder head without changing the shape of the intake passage, so the engine output performance Can be further improved.

[Brief description of the drawings]

FIG. 1 is an overall view showing an intake device of an engine and a flange portion of a cylinder head.

FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, showing the shape of a flange of a cylinder head.

FIG. 3 is a sectional view taken along line BB of FIG. 1, showing a sectional shape of a spacer according to the present invention in the vicinity of a mounting flange of a cylinder head.

FIG. 4 is a cross-sectional view taken along the line CC shown in FIG. 1, showing a cross-sectional shape of a spacer near a mounting surface of the intake device.

FIG. 5 is a drawing showing a direction indicated by an arrow D shown in FIG. 1;

FIG. 6 is a sectional view taken along line FF shown in FIG. 3;

[Explanation of symbols]

Reference Signs List 1 cylinder head 1a mounting flange 1b intake passage (first intake passage) 1c combustion chamber 1d, 1e female thread portion (second female thread portion) 1f female thread portion (first female thread portion) 2 spacer 2a cylinder head Mounting surface 2b Communication portion 2c Intake device mounting surface 2d, 2e Insertion hole (second insertion hole) 2f Insertion hole (first insertion hole) 2g Recess (first insertion hole) 2h Female screw portion (first female) 2j Opening to cylinder head (first opening) 2k Opening to intake device (second opening) 3 Intake device 3a Flange 3b Intake passage 3d, 3e Insertion hole (third insertion hole) ) 3h insertion hole (fourth insertion hole) 4 bolt (first bolt) 4a bolt head 5 bolt (third bolt) 6 bolt (second bolt)

Claims (1)

[Claims] A first intake passage formed in a cylinder head of the engine, a communication passage communicating a second intake passage formed in an intake device of the engine, and a first passage provided in the cylinder head. A first insertion hole for inserting a first bolt screwed with the female screw portion, a concave portion forming a seating surface of the first bolt, and a second female screw portion provided on the cylinder head; A second bolt through which a second bolt to be inserted is inserted together with a third insertion hole formed in the suction device, and a third bolt inserted through a fourth insertion hole provided in the suction device. An intake device for an engine, wherein the cylinder head and the intake device are attached via a spacer provided with a third female screw portion.