JPH0642356A - Structure of intake control valve for internal combustion engine - Google Patents

Abstract

PURPOSE:To reduce flow resistance in the spot of an intake control valve and to improve assembling ability of the intake control valve, in structure wherein the intake control valve is provided with two intake valves disposed in a single cylinder, two intake passages of each of the two intake air valves, and a butterfly type plate valve body arranged in one intake air passage of the two intake passages. CONSTITUTION:A valve insertion hole 16 communicated with the interior of an intake passage 6 is arranged in a direction crossing the axis of the intake passage approximately at right angles, and a plug member 17 to close the valve insertion hole is removably inserted in the valve insertion hole. A plate valve body 11 has one end part to which a valve stem 12 for opening and closing operation is fixed and the other end part to which the pin shaft 19 for support is secured. The valve shaft 12 on the one end part side and the pin shaft 19 on the other end side are rotatably inserted in a bearing hole 20, formed in the plug member, and a bearing hole 21, respectively, formed on the inner surface of the intake passage 6, and supported thereto rotatably around an axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to one cylinder,
An intake control that includes two intake valves and two intake passages to each of the intake valves, and opens and closes the one intake passage in one of the intake passages according to a load. The present invention relates to the structure of the intake control valve in an internal combustion engine having a valve.

[0002]

2. Description of the Related Art As described above, one cylinder is provided with two intake valves and two intake passages to each of the intake valves, while one of the intake passages is provided. An internal combustion engine having an intake control valve for opening and closing one of the intake passages according to the load is disclosed in, for example, Japanese Patent Laid-Open No. 61-
It is well known as described in Japanese Patent Publication No. 70132.

In the conventional internal combustion engine of this type, an intake control valve provided in one of the intake passages of the internal combustion engine is disclosed in JP-A-61-70132. The valve shaft for opening and closing the valve shaft is provided so as to penetrate the intake passage in a skewered manner, and the butterfly type plate valve body is attached to the valve shaft by a plurality of headed screws. ing.

[0004]

However, in the conventional intake control valve, as described above, the valve shaft for opening / closing operation is inserted into the intake passage in a skewered manner, and the valve shaft is inserted into the intake passage. Since the butterfly type plate valve body is configured to be attached with a plurality of headed screws, the valve shaft has both ends supported, so that it has the advantage of having high strength. Since the passage cross-sectional area at the location of the intake control valve will be greatly reduced by the valve shaft penetrating the intake passage in a skewered manner and the heads of the plurality of screws for attaching the plate valve body, There is a problem that the flow resistance of the intake air is large, and therefore the output is greatly reduced by this flow resistance.

In addition, in the conventional intake control valve, the valve shaft for opening / closing operation is first inserted into the intake passage so as to penetrate the intake passage in a skewer-like manner at the time of assembly, and then the butterfly type valve is installed inside the intake passage. Since it is necessary to attach the plate valve body to the valve shaft with a plurality of headed screws, there is also a problem in that it requires a great deal of work for assembling the plate valve and the cost is greatly increased. It was

An object of the present invention is to provide a structure of an intake control valve that solves these problems.

[0007]

In order to achieve this technical object, the present invention provides one cylinder with two intake valves and two intake passages to each of the intake valves. In an internal combustion engine in which an intake control valve having a butterfly-type plate valve body is provided in one of the intake passages, a valve insertion hole opening in the intake passage is provided.
Provided so as to extend in a direction substantially perpendicular to the axis of the intake passage,
A plug member for closing the valve insertion hole is removably inserted into the valve insertion hole, while the plate valve body of the intake control valve has an opening / closing valve shaft supported at one end and the other end. Pin shafts are fixed so that the axes of the valve shaft and the pin shafts coincide with each other, and one of the opening / closing operation valve shafts is inserted into the bearing hole formed in the plug member and the other support pin is inserted. The shafts are rotatably inserted into the bearing holes formed on the inner surface of the intake passage to support the shafts.

[0008]

[Operation] In this configuration, the butterfly type plate valve body in the intake control valve is constituted by an opening / closing valve shaft fixed to one end thereof and a supporting pin shaft fixed to the other end thereof.
Both ends can be supported. On the other hand, since the valve shaft and the pin shaft supporting both ends of the plate valve body need only be provided to both ends of the plate valve body, the valve shaft for opening / closing operation is provided in the intake passage as in the conventional case. It does not need to be installed so as to penetrate in a skewered state, in other words, it is possible to omit the installation of the valve shaft for opening / closing operation in the intake passage, and moreover, as in the conventional case, Since it is not necessary to use a plurality of screws with heads to attach the valve element as in the conventional case, the passage cross-sectional area at the intake control valve in the intake passage should be reduced by the valve shaft for opening / closing operation. Can be prevented.

Further, the plate valve body having the opening / closing operation valve shaft and the supporting pin shaft is mounted in the intake passage through the valve insertion hole together with the plug member that pivotally supports the opening / closing operation valve shaft. As a result, it is possible to reduce the number of steps required for assembling because it is not necessary to perform the assembling work in the intake passage as in the conventional case.

[0010]

Therefore, according to the present invention, the flow resistance in the intake passage can be greatly reduced, the output of the internal combustion engine can be increased, and the labor required for assembly can be reduced, resulting in a significant cost reduction. It has the effect that it can be reduced.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. In the figure, reference numeral 1 indicates an internal combustion engine including a plurality of cylinders A ₁ and A _2, and each of the cylinders A ₁ and A ₂ is
Two intake valves 2 and 3 and an intake port 4 for both intake valves 2 and 3 are formed.

Reference numeral 5 indicates a valve body attached to a longitudinal side surface of the internal combustion engine 1, and the valve body 5 has two intake passages of circular cross section which communicate with the one intake port 4 at the same time. 6 and 7 are formed at the locations of the cylinders A ₁ and A ₂ , respectively, and intake pipe lines 8 and 9 from an air cleaner (not shown) are connected to the intake passages 6 and 7, respectively. The cross-sections of the intake passages 6 and 7 are circular.

An intake control valve 10 having a butterfly type valve body 11 is provided in one of the intake passages 6 and 7, and the intake control valve 10 is an opening / closing valve. A lever 13 fixed to the shaft 12 is connected to an actuator 15 via a connecting rod 14, so that the actuator 15 causes the internal combustion engine 1 to be fully closed when the load is small and fully open when the load is large. It is configured.

The intake control valve 10 is constructed as described below. That is, the valve body 5 has a valve insertion hole 16 having a diameter larger than the inner diameter of the one intake passage 6, the axis of which is perpendicular to the axis of the one intake passage 6, and the valve insertion hole 16 is The valve insertion hole 16 is formed so as to communicate with the intake passage 6, and a plug member 17 having an O-ring 18 for sealing fitted on the outer peripheral surface is detachably inserted into the valve insertion hole 16. On the other hand, the plug member 17 is configured to be closed, and a substantially semicircular recess 17a is provided in a portion of the plug member 17 inside the intake passage 6, so that the passage cross section in the intake passage 6 is maintained to be circular. To do.

On the other hand, the plate valve body 11 of the intake control valve 10 is provided with the opening / closing valve shaft 12 at one end thereof and a supporting pin shaft 19 at the other end thereof. 19 are fixed so that their axes coincide with each other, and one of the opening / closing valve shafts 12 for opening and closing is inserted into a bearing hole 20 penetrating the plug member 17, and the other supporting pin shaft 19 is provided.
Are rotatably inserted into bearing holes 21 formed in the inner surface of the intake passage 6 to support them.

A seal member 25 for the valve shaft 12 is provided in the bearing hole 20 of the plug member 17, and the constricted portion 12a of the valve shaft 12 is fitted to the tip of the upper surface of the plug member 17. A retaining member 22 having a round groove 22a
While being fastened with the screw 23, the retaining member 22
Is fastened to the valve body 5 with a screw 24 so that the valve shaft 12 and the plug member 17 are held in a non-removable manner.

With this configuration, the butterfly type plate valve body 11 of the intake control valve 10 has an opening / closing valve shaft 12 fixed to one end thereof and a supporting pin shaft 19 fixed to the other end thereof. While both ends can be supported by, the plate valve body 11 has a valve shaft 12 at one end thereof.
However, since it is sufficient to provide the pin shaft 19 at the other end, the reduction of the passage cross-sectional area of the intake passage 6 due to the valve shaft can be greatly reduced.

Further, as shown in FIG. 6, the plate valve body 11 having the opening / closing operation valve shaft 12 and the supporting pin shaft 19 is different from the stopper member 17 which pivotally supports the opening / closing operation valve shaft 12. Since it can be mounted in the intake passage 6 through the valve insertion hole 16 in the assembled state, the number of steps required for assembly can be reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway plan view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a cross-sectional view in a disassembled state.

[Explanation of symbols]

1 Internal Combustion Engine A ₁ , A ₂ Cylinder 2, 3 Intake Valve 4 Intake Port 5 Valve Body 6, 7 Intake Passage 8, 9 Intake Pipeline 10 Intake Control Valve 11 Plate Valve Body 12 Open / Close Valve Shaft 16 Valve Insertion Hole 17 Plug member 19 Pin shaft 20 Bearing hole 21 Bearing hole

Claims (1)

[Claims] 1. A cylinder is provided with two intake valves and two intake passages to each of the intake valves,
In an internal combustion engine having an intake control valve having a butterfly-type plate valve element in one of the intake passages, a valve insertion hole opening in the intake passage is defined as an axis of the intake passage. The valve member is provided so as to extend in a substantially right-angled direction, and a plug member for closing the valve insertion hole is detachably inserted into the valve insertion hole, while the plate valve body of the intake control valve has an opening and closing at one end thereof. Operation valve shaft, support pin shaft at the other end,
The valve shaft and the pin shaft are fixed so that their axes coincide with each other, and one of the opening and closing operation valve shaft is provided in a bearing hole formed in the plug member, and the other supporting pin shaft is provided in the intake passage. A structure of an intake control valve in an internal combustion engine, wherein the structure is rotatably inserted and rotatably supported in bearing holes formed in the inner surface of the.