JPH088248Y2 - Intake control valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an intake control valve device used in an intake device of a multi-cylinder internal combustion engine.

[Prior art]

For example, in JP-A-56-115818, a butterfly type intake control valve is provided in the surge tank, and when the valve is fully closed, the inside of the surge tank is dispersed into a first internal chamber and a second internal chamber, A multi-cylinder internal combustion engine is disclosed in which, when fully opened, the two internal chambers are communicated with each other to change the equivalent pipe length of the intake passage, thereby utilizing the intake inertia effect to obtain high charging efficiency over the entire engine speed range. There is.

The intake control valve device used in this type of internal combustion engine has a high seal because the intake inertia effect is weakened and the charging efficiency cannot be sufficiently increased even if there is a slight air leak when the intake control valve is fully closed. Sex is required. Therefore, a valve holder equipped with a butterfly-type intake control valve is formed separately from the surge tank in order to secure sealing performance and improve workability in assembly.
The intake control valve device that fits the partition wall of the holder into the notch formed in the surge tank is actually opened.
No. 23 publication.

However, since this intake control valve device has a structure in which the valve holder is simply fitted into the notch, a gap is apt to occur at the joint surface between the holder and the notch and the sealing performance is not always sufficient.

Therefore, the present applicant has previously proposed the intake control valve device shown in FIGS. 4 to 7. The device comprises a valve holder 10 and a gasket 20, and the holder 10 is fitted to the notch 32 formed in the partition wall 31 of the surge tank 30 via the gasket 20.

This valve holder 10 is composed of a lid portion 11 and a partition wall portion 12 provided upright on the lid portion 11, and the partition wall portion 12 has a trapezoidal shape that narrows toward the tip and a communication hole 14 is formed in the central portion. . A butterfly-type intake control valve 15 for controlling the opening and closing of the hole 14 is rotatably assembled to the communication hole 14, and a shaft 16 to which the valve is fixed is connected to an actuator 17 fixed to the back side of the lid 11. Has been done.

Further, as shown in the enlarged view of FIG. 7C, a groove 18 having a concave cross section is formed in series on the outer peripheral surface of the partition wall 12,
As shown in the enlarged view of FIG. 5, two holes 19 having a perfect circular cross section are formed at appropriate intervals on the bottom surfaces of the grooves 18 on both side surfaces of the above.

On the other hand, the gasket 20 is made of an elastic material such as rubber and is formed in a gate shape in accordance with the trapezoid of the partition wall portion 12, and its cross-sectional shape is fitted into the groove 18 as shown in an enlarged view in FIG. 7 (C). It is formed of a rectangular base 21 and a projection 22 that abuts on the inner peripheral surface of the notch 32 of the surge tank 30. Further, a projection 23 that is press-fitted into the hole 19 is integrally formed on the surface of the base portion 21 facing the groove 18. As shown in the enlarged view of FIG. 6, the protrusion 23 has a length L ₁ along the longitudinal direction of the gasket 20 which is slightly longer than the inner diameter D _{1 of the} hole 19 and a length L _{2 in the} direction orthogonal to the longitudinal direction. Are formed in an oval shape shorter than the inner diameter of the hole 19. Furthermore, a gasket 18 is provided on both sides of the tip of the protrusion 23.
Two protrusions 24 projecting in a direction orthogonal to the longitudinal direction of the hole 24 are formed, and a length L ₃ between both ends of the protrusion 24 is set to be slightly longer than the inner diameter of the hole 19.

The gasket 20 having such a structure is a valve holder.
Prior to fitting the 10 into the notch 32 of the surge tank 30,
The protrusion 23 is press-fitted into the groove 19 and fitted into the groove 18.

The intake control valve device previously proposed by the applicant has the above-described configuration, and the gasket 20 is provided between the outer peripheral surface of the partition wall 12 of the valve holder 10 and the notch 32 of the surge tank 30 into which the partition wall 12 is fitted. Since the above is interposed, the sealability between the partition wall portion 12 and the notch portion 32 is improved, and air leakage can be reliably prevented.

Also, when the protrusion 23 is press-fitted into the hole 19 when the gasket 20 is fitted into the groove 18, the protrusion 23 is pressed as shown in FIG. 7 (B).
Since both the large-diameter side surfaces and the projection 24 are pressed against the inner surface of the hole 19, when a load is applied to the projection 23 in the detaching direction,
The friction resistance due to the pressure contact suppresses the movement of the protrusion 23 in the detaching direction.

[Problems to be solved by the present invention]

As described above, the peripheral surface of the protrusion 23 is formed into a hole 19 like the conventional one previously proposed by the applicant (hereinafter referred to as the conventional one).
In the case of elastically pressure-contacting the inner surface of the protrusion, the resistance force that prevents the protrusion 23 from coming off is only the frictional resistance force due to the axial surface of the protrusion 23. Protrusion when assembled in surge tank 30
There is a problem that the gasket does not have enough resistance against the load in the detaching direction acting on 23, and the gasket floats up or detaches from the groove 18.

In view of this point, the present invention increases the locking force of the protrusion 23 with the partition wall 12, that is, the resistance force against the load in the detaching direction of the protrusion 23, and prevents the gasket from rising or detaching from the valve holder. It is an object of the present invention to provide an intake control valve device which can be more effectively prevented and improved in workability in assembling.

[Means for solving the problem]

In order to achieve such an object, the present invention provides an intake control valve device in which a notch is formed in a partition of a surge tank and a partition of a valve holder having an intake control valve is fitted in the notch. A series of grooves (18) are formed on the outer peripheral surface of the valve holder partition (12), and a hole (19) is formed on the bottom surface of the groove (18). An auxiliary hole (19) that is orthogonal to (19) and opens on the upper surface of the partition (12) and has a diameter larger than the inner diameter of the hole (19).
A) and the groove (1) separately formed in the partition wall (12).
8) A gasket (20) made of an elastic material to be fitted is provided, the inner surface of the gasket (20) has a diameter to be press-fitted into the hole (19), and the tip portion is in the auxiliary hole (19A). A protrusion (23) having a length to be inserted is integrally formed, and a protrusion (24) located on the side surface of the tip end portion of the protrusion (23) and having a diameter larger than the inner diameter of the hole (19) is integrally formed. 23) through hole (19)
The projection (24) by pressing into the hole (19) and the auxiliary hole (19A).
It is characterized in that it is engaged with the surface of the auxiliary hole (19A) in the step portion (19a) formed by.

[Operation and effect of the present invention]

According to the above configuration, the load acting in the detaching direction of the protrusion (23) can be received by the engagement surface between the protrusion (24) and the auxiliary hole (19A) orthogonal to the load direction, and this receiving The force is larger than the frictional resistance force by the axial surface of the protrusion (23). Therefore, the resistance force against the detachment of the protrusion (23) is not only the friction resistance force that the outer peripheral portion of the protrusion is elastically pressed against the inner surface of the hole in the related art, but also the large resistance force (including the large resistance force due to the engaging surface). The locking force) can be further prevented from detaching the gasket as compared with the conventional one. Therefore, the valve holder (1
When assembling (0) into the surge tank (30), the gasket (20) is prevented from rising or coming off the groove (18), and the workability of assembling the valve holder is improved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, the partition wall of the valve holder 10
An auxiliary hole 19A, which communicates with a hole 19 formed in the bottom surface of the groove 18, is formed on the upper surface of 12 in a direction orthogonal to the hole 19. As shown in FIG. 2, the auxiliary hole 19A has an inner diameter D ₂ larger than the inner diameter D _{1 of the} hole 19, and a step portion is formed at the connecting portion between the hole 19 and the auxiliary hole 19A.
19a is formed.

The length L of the hole 19 is set to be substantially equal to or slightly shorter than the length L ₄ from the lower end of the protrusion 24 of the protrusion 23 to the gasket base portion 21 shown in FIG. When press-fitted, the protrusion 24 is located in the auxiliary hole 19A, and the lower end of the protrusion 24 is locked to the surface of the auxiliary hole 19A of the stepped portion 19a.

Since the other structure of this embodiment is the same as that of the intake control valve device described with reference to FIGS. 4 to 9, the same components are designated by the same reference numerals and the description thereof will be omitted.

According to the present embodiment, when the protrusion 23 is press-fitted into the hole 19 when the gasket 20 is fitted in the groove 18, both the side surfaces of the protrusion 23 in the large diameter direction and the protrusion 24 are compressed and deformed to be pressed against the inner surface of the hole 19. While approaching. Then, the protrusion 24 passes through the hole 19 and the auxiliary hole
When it reaches 19A, the shape is restored and the auxiliary hole in step 19a
Engage with surface 19A.

Therefore, when a load in the detaching direction is applied to the protrusion 23, due to the frictional force between the protrusion 23 and the hole 19 and the engaging force between the engaging surface between the protrusion 24 and the auxiliary hole 19A orthogonal to the load direction. The resistance against the detachment of the protrusion 23 is increased. Therefore gasket 20
The detachment of the valve holder 10 from the valve holder 10 can be prevented more than in the conventional case, and the workability of assembling the valve holder 10 can be further improved.

Further, by visually observing the protrusion 24 through the auxiliary hole 19A, it can be confirmed whether or not the gasket 20 is detached from the groove 18.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an intake control valve device according to an embodiment of the present invention, and FIG. 2 (A) is an enlarged side view of essential parts showing holes and auxiliary holes formed in a valve holder of the device. 2B is a sectional view taken along the line BB of FIG. 2A, FIG. 3A is an enlarged sectional view of an essential part showing a fitted state of a valve holder and a gasket, and FIG. 3B is BB of FIG. 3 (A)
3C is a sectional view taken along line CC of FIG. 3B, FIG. 4 is an exploded plan view showing a conventional intake control valve device, and FIG. 5A is FIG. 5B is an enlarged side view of an essential part showing holes formed in the valve holder of the device.
FIG. 6 (A) is an enlarged plan view showing a protrusion provided on the gasket of the device, FIG. 6 (B) is a side view of the protrusion, and FIG. (A) is an enlarged cross-sectional view of a main part showing a fitted state of a valve holder and a gasket of the same device, FIG. 7 (B) is a cross-sectional view taken along line BB of FIG. 7 (A), and FIG. 7 (C). ) Is a sectional view taken along line CC of FIG. 7 (A). 10 …… Valve holder, 12 …… Differential wall section, 15 …… Intake control valve, 18 …… Groove, 19 …… Hole, 19A …… Auxiliary hole, 19a ……
Step, 20 …… Gasket, 23 …… Protrusion, 24 …… Protrusion, 30
...... Surge tank, 31 ...... Bulk wall, 32 ...... Notch

Claims (1)

[Scope of utility model registration request] 1. An intake control valve device comprising a partition of a surge tank, wherein a partition is formed in the partition of the surge tank, and the partition of the valve holder having an intake control valve is fitted into the partition. A series of grooves are formed on the outer peripheral surface and a hole is formed on the bottom surface of the groove, and an auxiliary hole having a diameter larger than the inner diameter of the hole is formed in the inner part of the hole at the upper surface of the partition wall orthogonal to the hole. A hole is formed and a gasket made of an elastic material that fits into the groove formed in the partition wall is separately provided, and the inner surface of the gasket has a diameter for press-fitting into the hole, and the tip portion projects into the auxiliary hole. And a projection having a diameter larger than the inner diameter of the hole is integrally formed on the side surface of the tip of the projection, and the projection is press-fitted into the hole to form the projection and the auxiliary hole. It is locked to the surface of the auxiliary hole in the step formed by Intake control valve and wherein the a.