JPH05209540A - Sliding air adjustment valve of internal combustion engine - Google Patents

Abstract

PURPOSE:To improve operability of a valve by preventing or reducing abrasion powder caused by vibration of the end part of the valve due to oscillation and preventing scuffing caused by the abrasion powder or another foreign materials. CONSTITUTION:A plate-shaped valve 1 is assembled into a body 7 forming a passage 9 to flow through intake air of an internal combustion engine so that the valve is slid in the direction crossing the passage 9. Escape grooves 4a, 4b running along the width of the end part of the valve 1 are provided on the bottom surface of a valve storage part 4, in which the valve 1 of the body 7 is assembled. The escape grooves 4a, 4b have functions of damping the degree of contact to the body 7 due to the vibration of the end part of the valve, and they also function as escapes for abrasion powder and foreign materials intruded into the valve storage part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide type air for an internal combustion engine which opens and closes the passage, that is, increases and decreases the passage area by sliding a plate valve in a direction orthogonal to the passage of intake air of the internal combustion engine. Regarding quantity control valve.

[0002]

2. Description of the Related Art A conventional slide type air amount adjusting valve of this type is a plate-shaped valve which is incorporated in a body which forms a passage through which intake air of an internal combustion engine flows and which is slidable in a direction orthogonal to the passage. Is equipped with. A needle bearing is interposed between the body and the valve for the purpose of improving the operability of the valve. As such a slide type air amount adjusting valve, for example, Japanese Utility Model Publication No. 2-160
There is one disclosed in Japanese Patent No. 41.

[0003]

In the conventional slide type air amount adjusting valve, engine vibration or the like is added because the clear clearance between the valve and the body required for the sliding operation of the valve is set to be small ( This is also referred to as vibration), and the valve end portion bends and comes into contact with the body, which causes abrasion powder. Further, since there is no escape area for the abrasion powder and foreign matter that has entered there in the valve accommodating portion of the body, they are stagnant. Then, as the valve slides,
So-called caulking, such as the abrasion powder and foreign matter biting into the valve, occurs, which adversely affects the operation of the valve.

Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to prevent or reduce the generation of abrasion powder due to the vibration of the valve end portion due to vibration, and to prevent the abrasion powder or foreign matter. It is an object of the present invention to provide a slide type air amount adjusting valve for an internal combustion engine, which is capable of avoiding caulking and improving valve operability.

[0005]

In a slide type air amount adjusting valve for an internal combustion engine according to the present invention which solves the above problems, a plate valve is orthogonal to the passage in a body forming a passage through which intake air of the internal combustion engine flows. In a slide type air amount adjusting valve of an internal combustion engine of a type which is slidably incorporated in a direction in which the valve slides to open and close the passage.
A relief groove along the width direction of an end portion of the valve is provided on a bottom surface of a valve accommodating portion of the body in which the valve is incorporated.

[0006]

According to the above means, even if the end portion of the valve is bent due to vibration, the end portion can escape to the escape groove of the valve accommodating portion, and the degree of contact of the end portion with the body can be reduced. It Further, in the valve accommodating portion of the body, the abrasion powder and the foreign matter that has entered there are allowed to escape to the escape groove without stagnation, thereby avoiding a problem such as caulking of the valve.

[0007]

An embodiment of the present invention will be described with reference to the drawings. A slide type air flow control valve is shown in plan view in FIG.
FIG. 3 shows a sectional view taken along the line AA of FIG. For convenience of explanation, the front-back direction of the device corresponds to the left-right direction of FIGS. 2 and 3, and the left-right direction of the device corresponds to the up-down direction of FIG. The body 7 is composed of a main body 2 of the main body and a cover 3 fixed to the upper surface of the body 7 with bolts 5. A proper number of passages (4 in the figure) 9 through which the intake air of the internal combustion engine flows are penetrated through the body 7 in the vertical direction.
Are formed at substantially equal intervals in the front-rear direction. Shallow-bottomed rectangular recessed grooves 8 are symmetrically formed on the joint surface between the body 2 and the cover 3. The biconcave groove 8 forms a flat valve housing 4 by joining the body 2 and the cover 3. A plan view with the cover 3 removed is shown in FIG. As shown in FIG. 7, a cutout groove 8 a is provided on one side of the concave groove 8. Although not shown, the notch groove 8a is also formed in the cover 3 so as to be symmetrical with it.

In FIGS. 3 and 7, the valve accommodating portion 4 is provided with a strip-shaped valve 1 slidable in the front-back direction of the body. The valve 1 is provided with a valve hole 1a which communicates the passages 9 at the front slide position. Further, when the valve 1 is retracted to the sliding position shown in FIG. 6 showing the closed state, the passage 9 is closed, that is, fully closed. By sliding the valve 1 between fully closed and fully opened, the passage area of the intake air of the internal combustion engine is changed. A predetermined clearance that allows the valve 1 to slide is provided between the upper and lower surfaces of the valve 1 and the bottom surface of the concave groove 8 facing the valve 1. As shown in FIG. 7, the valve 1 is provided on one side thereof with a valve operating device mounting portion 10 which projects through the cutout groove 8 a of the recessed groove 8 and is connected to this mounting portion 10. It is opened and closed by operating an operation rod (not shown).

As shown in FIG. 1 which is a sectional view taken along the line AA of FIG. 2 and FIG. 4 which is a sectional view taken along the line C-C of FIG.
On the bottom surface of each groove 8 of the body 2 and the cover 3,
Rail grooves 11 facing the left and right sides of the valve 1 are formed symmetrically. The needle bearings 6 are housed in the respective rail grooves 11 via shims 12 on the bottom surface thereof. Each needle roller 6a of the needle bearing 6 comes into contact with the surface of the valve 1 and rolls as the valve 1 slides.
The closed state of the valve 1 of FIG. 1 is shown in FIG. Further, the needle bearing 6 is well shown in FIG. 8 which is a plan view with the cover 3 and the valve 1 removed.
The front-rear length of each of the groove 8 and the rail groove 11 is equal to that of the valve 1
The slide amount of the needle bearing 6 is set to be slightly larger than that in consideration of the slide amount. As well known, each needle roller 6a is rotatably held by a cage 6b at predetermined intervals (see FIG. 8).

In FIGS. 1 and 4, an elastic body 14 made of elastic rubber or rubber is interposed between the bottom surface (upper surface in the drawing) of the rail groove 11 of the cover 3 and the shim 12. The elastic body 14 is incorporated in a state of being compressed by a predetermined amount, and always urges, ie, presses the needle bearing 6 to the valve 1 via the shim 12. The needle roller 6a of each needle bearing 6 has a valve contact side portion slightly protruding from the opening end surface of each recessed groove 8 and holds the valve 1 in a state of being separated from the opening end surface of each recessed groove 8. is doing.

Further, as shown in FIGS. 1 and 8, front and rear escape grooves 4a and 4b along the width direction of both ends of the valve 1 are provided on the bottom surface of the concave groove 8, respectively. The depths of the escape grooves 4a and 4b are set to be equal to or larger than the maximum swing width of the end portion of the valve 1.

In the above slide type air amount adjusting valve, as shown in FIGS. 1 and 3, the valve 1 and the needle bearing 6 are in the forward position when fully opened. At this time, the valve 1 is in contact with the front wall of the valve accommodating portion 4, and the needle bearing 6 is in contact with each rail groove 1
It is in a state of being in contact with the front end of 1 or having a slight gap. When the valve 1 is retracted from this state, the passage area through which the intake air of the internal combustion engine flows is reduced. At this time, the needle bearing 6 moves in the same direction in each rail groove 11 as the valve 1 slides. The needle bearing 6 is driven by the elastic force of the elastic body 14 so that the valve 1
In addition, the shim 12 can be moved without rattling. Further, since a constant load is constantly applied between the valve 1 and the needle bearing 6, the needle bearing 6 rolls following the operation of the valve 1.

Then, as shown in FIGS. 5 and 6, the passage 9 is fully closed in the state where the valve 1 is in contact with the rear wall of the valve accommodating portion 4. At this time, the needle bearing 6
Is in contact with the rear end of the rail groove 11 or has a slight gap. Further, the reverse operation to the above causes the fully closed to fully open state.

According to the slide type air amount adjusting valve, even if the end portion of the valve 1 is bent due to the vibration of the engine or the like, the end portion of the valve 1 escapes the relief grooves 4a, 4b.
And the degree of contact of the end portion with the body 7 is reduced. This prevents or reduces the generation of abrasion powder due to the contact between the body 7 and the valve end portion. In addition, in the valve accommodating portion 4 of the body 7, the abrasion powder and the foreign matter that has entered there are not stagnation and escape grooves 4a,
Since it is possible to escape to 4b, it is possible to avoid problems such as caulking of the valve 1 due to the abrasion powder and foreign matter. Therefore, the escape grooves 4a and 4b provided in the valve accommodating portion 4 have a function of reducing the degree of contact with the body 7 due to the swing of the valve end portion, and serve as an escape area for abrasion powder and foreign matter that has entered the valve accommodating portion 4. By also having a function, it is possible to prevent or reduce the generation of wear debris, and avoid the caulking of the valve 1 due to the wear debris or foreign matter, and thus the operability of the valve 1 can be improved.

[0015]

According to the present invention, the relief groove provided in the valve accommodating portion of the body has a function of reducing the degree of contact with the body due to the swing of the valve end portion, and has entered into the abrasion powder and the valve accommodating portion. By also having a function as an escape area for foreign matter, it is possible to prevent or reduce the generation of wear debris, and further, it is possible to avoid the caulking of the valve due to the wear debris and foreign matter, thus improving the operability of the valve.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a slide type air amount adjusting valve.

FIG. 2 is a plan view of the same.

3 is a cross-sectional view taken along the line AA of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

5 is a cross-sectional view showing a closed state of the valve of FIG.

6 is a cross-sectional view showing a closed state of the valve of FIG.

FIG. 7 is a plan view with a cover removed.

FIG. 8 is a plan view with a cover and a valve removed.

[Explanation of symbols]

 1 Valve 4 Valve Housing 4a, 4b Relief Groove 7 Body 9 Passage

Claims (1)

[Claims] 1. An internal combustion engine of a type in which a plate-shaped valve is slidably installed in a body forming a passage through which intake air flows in the internal combustion engine in a direction orthogonal to the passage, and the passage is opened and closed by sliding the valve. The slide type air amount adjusting valve for an internal combustion engine, wherein a relief groove extending along a width direction of an end portion of the valve is provided on a bottom surface of a valve accommodating portion of the body in which the valve is incorporated.