JP2974515B2 - Intake control valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake control valve device.

[0002]

2. Description of the Related Art Conventionally, as a structure for installing an intake control valve in an intake port formed in a body of an intake control valve device of an internal combustion engine, for example, as shown in FIG. Then, the valve shaft 2 is inserted through the insertion hole 3 so as to cross the intake port 4, and the valve shaft 2 of the intake port 4 is inserted into the valve shaft 2 from a disk having substantially the same cross-sectional shape as the intake port 4. (See, for example, Japanese Utility Model Laid-Open No. 1-113682).

Further, as shown in FIG. 11, an intake control valve for controlling the flow of the intake air-fuel mixture at a helical-type intake port for applying a swirl flow to the combustion chamber of the internal combustion engine to suck the air-fuel mixture is provided as shown in FIG. In some cases, the intake control valve 7 is installed to be inclined with respect to the axis of the intake port 8. Then, the structure is such that a screw hole 10 inclined with respect to the axis of the intake port 8 is formed in the body 9,
, A valve shaft 12 is rotatably provided in the valve holder 11, an intake control valve 7 is fixed to an inner end of the valve shaft 12, and a rotation operation mechanism is provided at an outer end. (2-9070)
No.).

[0004]

In the former case (FIG. 10) of the conventional structure, the disk-shaped intake control valve 5 is attached to the valve shaft 2 by connecting the intake control valve 5 to the intake port 4. A bolt 6 is used as a fixing means because it must be inserted into the intake port 4 from the open end. However, according to this bolt fixation,
Since the bolt head protrudes from the surface of the intake control valve 5,
This becomes the intake resistance when the valve is fully open, and the intake control valve 5
Near the upper and lower stream, turbulence and eddies occur in the flow of the air-fuel mixture. In addition, since the valve shaft 2 is also provided on the back surface of the intake control valve 5, when the valve is fully opened, the valve shaft 2 similarly becomes an intake resistance, and turbulence and eddies are generated in the flow of the air-fuel mixture.

In the latter structure (FIG. 11) of the conventional structure, a step is inevitably formed between the lower surface 12a of the valve shaft 12 and the upper wall surface 8a of the intake port 8, so that the recess space formed by the screw hole 10 is formed. 13 is formed, and the concave space 1 is formed.
Due to the presence of 3, the flow of the air-fuel mixture is disturbed or swirled in the intake control valve portion as described above.

As described above, when the intake resistance increases in the intake control valve portion, or when the flow of the air-fuel mixture is disturbed or swirled, the pressure loss of the air-fuel mixture increases. For this reason, it is necessary to increase the flow path diameter of the intake port in order to obtain the required flow rate of the air-fuel mixture, which causes a problem that the intake control valve device becomes large and the output of the internal combustion engine is reduced.

Therefore, the present invention proposes an intake control valve device which does not have a bolt or a valve shaft which generates turbulence or a vortex in the flow of the intake resistance or the air-fuel mixture as described above, and which does not have a concave space, and solves the above-mentioned problems. It is intended to do so.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a body (15) having an intake port (1).
A valve insertion hole (19) is formed in a direction transverse to 6), and the inside diameter of the valve insertion hole (19) is set to an inside diameter capable of passing an intake control valve (18) installed in an intake port (16). A plug (20) is fitted into the valve insertion hole (19),
A valve shaft (22) is rotatably provided on the plug (20), and an intake control valve (18) is fixed to an inner surface end of the plug (20) in the valve shaft (22);
The inner surface (20a) of the plug (20) has the same diameter as the inner peripheral surface (16a) of the intake port (16) when the plug (20) is fitted in the valve insertion hole (19). It is characterized by being formed on a continuous arc surface.

[0009]

In order to assemble the intake control valve (18) into the intake port (16), the intake control valve (18) is fixed to the inner end of the valve shaft (22) previously inserted into the plug (20). Then, the plug (20) is fitted into the valve insertion hole (19) of the body (15), and the intake control valve (18) is installed in the intake port (16) as shown in FIG.

As described above, the fact that the intake control valve (18) can be fixed to the valve shaft (22) outside the body (15), that is, outside the intake port (16), means that the intake control valve (18) can be fixed to the valve shaft (22). 22) It can be easily and securely fixed to the end face by brazing. Therefore, unlike the related art, it is possible to eliminate a shaft penetrating into the intake port and a bolt fixing the intake control valve to the shaft. By eliminating the valve shaft and the bolt in this manner, the intake resistance due to their presence is eliminated, and the flow of the air-fuel mixture is not disturbed and the vortex is not generated.

Further, even when the intake control valve (18) and its valve shaft (22) are provided so as to be inclined with respect to the axis of the intake port (16), the inner surface (2) of the plug (20) is formed.
By forming Oa) on a continuous arc surface having the same diameter as the inner wall surface (16a) of the intake port (16), the concave space (13) formed by the conventional structure can be eliminated.

Therefore, the flow of the air-fuel mixture is not disturbed or the vortex is not generated due to the presence of the concave space (13).

[0013]

Next, a description will be given of a first embodiment shown in FIGS. 1 to 8 in which the present invention is applied to an intake control valve device of a multi-cylinder internal combustion engine.

In FIG. 1, reference numeral 15 denotes a body of an intake control valve device, in which intake ports 16 and exhaust ports 17 of a number corresponding to the number of cylinders of the internal combustion engine are formed to penetrate in the front-rear direction. The embodiment of FIG. 1 shows an example in which the present invention is used for a four-cylinder internal combustion engine.

An intake control valve 18 is provided in each intake port 16, and the body 15 is provided with an operating section A for opening and closing each intake control valve 18. Since the intake control valve 18 and the operating portion A in all the intake port portions are the same, the following description will be made with respect to one intake control valve 18 and the operating portion A in FIGS.
This will be described in detail below.

Reference numeral 19 denotes a valve insertion hole, which is bored from the lower surface 15a side of the body 15 so that the axis thereof is orthogonal to the axis of the intake port 16. Further, the valve insertion hole 19 is formed in a circular hole, and its diameter is set slightly larger than the inner diameter of the intake port 16, and its inner portion 19 a reaches the axis of the intake port 16.

Reference numeral 20 denotes a plug for closing the valve insertion hole 19.
The outer diameter D ₁ shown in FIG. 6 is set to be substantially the same as the diameter of the valve insertion hole 19 so as to fit into the valve insertion hole 19. Further, the depth length L ₁ on both sides of the plug 20 is formed to be the same as the depth length of the valve insertion hole 19.

Reference numeral 20a denotes a semicircular inner surface formed inside the plug 20. The radius R of the semicircular inner surface is
The diameter of the intake port 16 is set to be the same as the radius of the intake port 16a, and the generatrix is set so as to be in the axial direction of the intake port 16 when the plug 20 is attached. When the plug 20 is fitted into the valve insertion hole 19, the feet 20 b and 20 c on both sides of the plug 20 are positioned by contacting the inner part 19 a of the valve insertion hole 19, and the peripheral wall surface of the intake port 16 is formed. The semicircular surface 16a and the semicircular inner surface 20a of the plug 20 form a perfect circular surface equivalent to the intake port 16.

Reference numeral 20d denotes a groove formed on the outer periphery of the plug 20, in which an O-ring 21 is fitted. Reference numeral 22 denotes a valve shaft rotatably provided in a shaft hole 20e formed in a shaft core portion of the plug 20, and a disk-shaped intake control valve 1 is provided at an inner end thereof.
8 is attached and fixed by brazing. A shaft 23 is rotatably fitted into a shaft hole 24 formed in the body 15 at a position opposite to the valve shaft 22 in the intake control valve 18 and fixedly attached thereto by brazing.

Reference numeral 25 denotes a dust seal fitted in a groove 20f formed in the plug 20.
It seals between the two. Reference numeral 26 denotes a plate for preventing the plug 20 from coming off. The base end of the plate 26 is fixed to the body 15 by a screw 27, and the intermediate portion is fixed to the plug 20 by a screw 28. Further, the tip portion is formed in a crotch shape as shown in FIG. 4, and the crotch portions 26a and 26b
It is fitted in a groove 22 a formed in the valve shaft 22.

The outer end of the valve shaft 22 is connected to the plug 2
An operation lever 29 is rotatably provided at the tip of the projection. A ball joint 30 is provided upright at the tip of the operating lever 29, and a clip 31 is provided on the ball joint 30.

Each clip 31 in each operating section A
Are commonly connected to one link 32 as shown in FIG. In FIG. 1, reference numeral 33 denotes a negative pressure type actuator. The other end of a negative pressure conduit 34 communicating with the negative pressure chamber is connected to an intake manifold (not shown). Reference numeral 35 denotes a rod, the base end of which is connected to a diaphragm (not shown) in the negative pressure type actuator 33, and the other end of which is connected to the operating lever 29 of one operating portion A.

By increasing or decreasing the negative pressure acting on the negative pressure type actuator 33, one link 3
2 reciprocates, and all the intake control valves 18 open and close simultaneously. Next, the order of assembling the intake control valve 18 and the plug 20 in this embodiment will be described.

First, a valve shaft 22 is connected to the intake control valve 18.
And the shaft 23 are soldered. Next, the dust seal 25 is press-fitted to the plug 20. Next, the valve shaft 22 to which the intake control valve 18 is fixed is connected to the shaft hole 20 e of the plug 20.
At the inner surface 20a side. Next, after the O-ring 21 is fitted into the groove 20d of the plug 20,
The two feet 20 b and 20 c are located at the back 1 of the valve insertion hole 19.
It fits into the valve insertion hole 19 until it hits 9a.

Next, the crotch portions 26a, 26b of the plate 26
Is inserted into a groove 22a formed in the valve shaft 22, the base of the plate 26 is fixed to the body 15 by a screw 27, and the plug 2 is fixed to the middle by a screw 28.
Fix to 0.

The above embodiment is an example in which the intake control valve 18 is provided so that its rotation axis is orthogonal to the axis of the intake port 16. In the case of being provided inclined with respect to the axis of the intake port 16,
For example, the structure is as shown in FIG.

In this embodiment, the valve shaft 2
2 and the plug 20 is inclined with respect to the axis of the intake port 16, so that the circular surface 20 a of the plug 20 is positioned so that its generatrix is flush with the generatrix of the peripheral wall surface 16 a of the intake port 16. It is formed inclined with respect to the axis. The intake control valve 18 is formed in a strip shape as an example corresponding to the helical intake port shown in FIG.

Since other structures are the same as those of the above-described embodiment, the same members are denoted by the same reference numerals as those of the above-described embodiment, and the description thereof will be omitted.

[0029]

As described above, according to the present invention, it is possible to reduce the intake resistance in the intake port and reduce the occurrence of turbulence in the flow of the air-fuel mixture and the generation of eddies as compared with the conventional structure. Pressure loss can be reduced.

Therefore, the flow path diameter of the intake port for obtaining the required air-fuel mixture flow rate can be made smaller than that of the conventional one, which contributes to downsizing of the intake control valve device. Further, since the pressure loss of the air-fuel mixture is reduced, the output of the internal combustion engine can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a view as seen from an arrow P in FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view taken along line CC of FIG. 2;

FIG. 6 is a front view of the plug.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

8 is a view of the plug of FIG. 7 viewed from the right side.

FIG. 9 is a sectional view showing another embodiment of the present invention.

FIG. 10 is a front view showing a first example of a conventional structure.

FIG. 11 is a sectional view showing a second example of the conventional structure.

[Explanation of symbols]

 15 Body 16 Intake port 16a Peripheral wall surface 18 Intake control valve 19 Valve insertion hole 20 Plug 20a Inner surface 22 Valve shaft

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02D 9/10 F16K 1/22

Claims (1)

(57) [Claims] The body (15) has an intake port (1).
A valve insertion hole (19) is formed in a direction transverse to 6), and the inside diameter of the valve insertion hole (19) is set to an inside diameter capable of passing an intake control valve (18) installed in an intake port (16). A plug (20) is fitted into the valve insertion hole (19),
The plug (20) is provided with a valve shaft (22) so as to be rotatable, an intake control valve (18) is fixed to an inner side end of the plug (20) in the valve shaft (22), and the plug (20) When the plug (20) is fitted into the valve insertion hole (19), the inner surface (20a) of the inner surface (20a) has the same diameter as the inner peripheral surface (16a) of the intake port (16) and is formed into a continuous arc surface. An intake control valve device characterized in that: