JPH10131774A - Intake air control valve interlocking device for multicylinder internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a connection device and reduce a clearance between intake air control valves to be connected. SOLUTION: An end 7 of a valve shaft 3 and an end 7A of a valve shaft 3A are semicircularly formed in their sections. Valves 5, 5A and screws 6, 6A are arranged on sectionally semi-circular portions of the valve shafts 3, 3A. Flat portions 8, 8A of the semi-circular portions recede from valve installation surfaces 4, 4A in a radial direction. The ends 7, 7A of the valve shafts are journalled to a shaft hole 9 of a valve stem 1. The valve installation surfaces 4 and 4A are directed oppositely to each other. The ends 7, 7A of the valve shafts 3, 3A are connected to each other by means of a plate spring member 10 in substantially an M-character form. Extention/contraction of the valve shafts 3, 3A in an axial direction due to thermal expansion is eliminated by a clearance (h).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a device for interlocking a plurality of intake air control valves in a multi-cylinder internal combustion engine.

[0002]

2. Description of the Related Art As a throttle valve interlocking device for a multi-cylinder internal combustion engine, a device disclosed in Japanese Utility Model Publication No. 4-2046 is known.

A throttle valve interlocking device of this type is, for example, as shown in FIGS. 4 (a) and 4 (b), valve bodies 21 and 22 forming a plurality of intake passages 20 and 20A substantially parallel to each other.
1A, the throttles are respectively independently supported at right angles to the intake passages 20, 20A, are coaxial with each other, are arranged with a gap a between opposing ends, and open and close the intake passages 20, 20A, respectively. Valve 22, 22A
, A plurality of valve shafts 23, 23A,
It has a shaft coupling 24 for connecting 23A.

[0004] Opposite ends of the valve shafts 23, 23A are provided with diametric grooves 25, 25 which are parallel to each other when the opening of each throttle valve 22, 22A is the same.
A is formed.

[0005] The shaft coupling 24 has a pair of diametric grooves 2 opposed to each other.
The center portion of a leaf spring material having a width c slightly smaller than the distance b between the bottom surfaces of 5, 25A is bent 180 degrees to form a groove 2 having the same diameter.
A parallel portion 26 having an outer dimension substantially equal to the groove width d of 5, 25A and a portion following both sides of the parallel portion 26 are inverted and bent, respectively, to form a parallel portion 2 on the outer surface side of the parallel portion 26 at the distal end.
6 is formed of a pair of clip portions 27, 27 having a narrower gap than the middle portion, and as shown in FIG.
It is formed in the shape of a letter.

The parallel portions 26 of the shaft coupling 24 are simultaneously inserted into a pair of diametric grooves 25, 25A facing each other, and the clip portions 27, 27 are elastically attached to the outer periphery of the ends of the valve shafts 23, 23A. The plurality of valve shafts 23, 23A are connected by locking. The throttle valves 22, 22A are attached to the respective valve shafts 23, 23A by screws 28, 28A, respectively.

The symbol e indicates that the valve bodies 21 and 21A are the valve shafts 23 and 2
3A is an interval between the portions that support the 3A. Valve shaft 2
The change in the gap a between the end portions of the valve shafts 23 and 23A due to the difference in thermal expansion between the valve shafts 23 and 23A and the valve bodies 21 and 21A is the parallel portion 26.
And, it is absorbed by the sliding in the valve axis direction of the contact surface between the clip portions 27, 27 and the ends of the valve shafts 23, 23A.

In addition to the difference in thermal expansion, the gap a
It is necessary to set the size to a certain value or more in consideration of the axial dimensional tolerance of the opposed valve shafts 23 and 23A and the variation in the assembly size.

[0009]

In the above prior art,
The space e between the valve bodies 21 and 21A, which determines the space for providing the connecting mechanism including the connecting portions of the valve shafts 23 and 23A and the shaft coupling 24, is determined by the difference in the thermal expansion, the dimensional tolerance of the valve shaft in the axial direction, and the assembling size. In consideration of the variation of the valve shafts 23 and 23A, the gap between the distal ends of the valve shafts 23 and 23A needs to be equal to or more than a certain value, so that it has to be increased.

However, in the case of a multi-cylinder internal combustion engine having no intake air control valve, the design of the connecting mechanism for connecting the valve shafts of the intake air control valves is not designed in consideration of the space required for the connection. There is a problem that an intake air control valve cannot be provided with a certain gap or more between the opposed ends.

Accordingly, the present invention provides an intake system for a multi-cylinder internal combustion engine that can connect a valve shaft with a small installation space without providing a gap between opposing ends of the valve shaft to absorb a difference in thermal expansion and the like. An object of the present invention is to provide an air control valve connecting device.

[0012]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of valve shafts are provided with approximately M
Interlocking devices connected by shaft couplings made of U-shaped spring members, each having a semi-lunar cross-section to which an intake air control valve (5) (5A) is attached.
(3A) are coaxial with each other and the valve mounting surface (4)
(4A) are arranged in opposite directions, and the ends (7) (7A) of both valve shafts (3) (3A) are axially oriented so that their flat portions (8) (8A) face each other. Determine the position of
An intake air control valve interlocking device for a multi-cylinder internal combustion engine, wherein end portions (7) and (7A) whose flat portions (8) and (8A) face each other are connected by the shaft coupling (10).

According to the present invention, since the ends of the valve shafts to be connected do not abut each other, a gap between the ends of both valve shafts is unnecessary as in the prior art, and the mounting space for the interlocking device is reduced.

According to a second aspect of the present invention, in the intake air control valve interlocking device for a multi-cylinder internal combustion engine according to the first aspect, the valve mounting surface (4) of each valve shaft (3) (3A) is provided.
(4A) is substantially in the same plane.

According to the present invention, the opening degrees of the plurality of interlocking valves (5) and (5A) match well. According to a third aspect of the present invention, in the intake air control valve interlocking device for a multi-cylinder internal combustion engine according to the second aspect, the shaft coupling (10) is provided.
The flat portions (8) and (8A) of the valve shafts (3) and (3A) abutting the parallel portions (11) of the valve shafts (4) and (4A) in the radial direction from the valve mounting surfaces (4) and (4A) of the respective valve shafts (3) and (3A). It is characterized by being retracted.

According to the present invention, the parallel portion of the shaft coupling can be easily inserted between the flat portions (8) and (8A) of the valve shafts (3) and (3A), and the parallel portion (11) of the shaft coupling (10) can be easily inserted. ) Is easier to form.

According to a fourth aspect of the present invention, in the intake air control valve interlocking device for a multi-cylinder internal combustion engine according to the second or third aspect, one of the valve shafts (3) contacting the parallel portion (11) of the shaft coupling (10). Or 3A) flat part (8 or 8
A) and the radial gap (h) between the valve mounting surface (4A or 4) of the other valve shaft (3A or 3) connected to the one valve shaft (3 or 3A) is defined by the valve (5) ( 5A) is set to be larger than the plate thickness.

According to the present invention, the intake air control valve attached to one of the valve shafts does not interfere with the other valve shaft and works smoothly.

[0019]

1 to 3 show preferred embodiments of the present invention, which will be described below with reference to these drawings.

In the valve body 1, intake passages 2 and 2A are formed in parallel. A first valve shaft 3 is provided across the intake passage 2 and a second valve shaft 3A is provided across the intake passage 2A.
Both valve shafts 3 and 3A are rotatably supported by the valve body 1.

The valve shafts 3 and 3A are provided with an intake air control valve (hereinafter simply abbreviated as "valve") mounting portion having a half-moon cross section as is well known. Valves 5 and 5A are attached by screws 6 and 6A, respectively.

As shown in FIG. 2B, the valve mounting surfaces 4 and 4A are formed by a plane including the diameter of the valve shaft 4 as shown in FIG. Therefore, the half-moon shape of the cross section of the portion where the valves 5, 5A of the valve shafts 3, 3A are attached is just a semicircle.

The valve shafts 3 and 3A are arranged such that the valve mounting surfaces 4 and 4A face in opposite directions. Valve stem 3
At the end 7 of the valve shaft 3A and at the end 7A of the valve shaft 3A, flat portions 8, 8A retreated in the radial direction from the valve mounting surfaces 4, 4A are formed in parallel with the valve mounting surfaces 4, 4A, respectively. The amount of retreat of the flat portions 8, 8A from the valve mounting surfaces 4, 4A is indicated by a symbol f (see FIG. 2).

The ends 7 and 7A of the two valve shafts 3 and 3A are loosely inserted into the shaft hole 9 of the valve body (body) such that the ends 7, 7A face each other in the radial direction as shown in the figure, and are substantially M-shaped. Are connected by a shaft coupling 10.

The shape of the shaft coupling 10 is made of a leaf spring material formed substantially in an M shape as shown in FIG. As shown in FIGS. 1 (a) and 1 (b), a shaft joint 10 is formed by a parallel portion 11 formed by bending this leaf spring material and a pair of clip portions 12 and 12 connected to both ends thereof. The parallel portion 11 is obtained by bending the central portion 11b of the leaf spring material by 180 degrees with an appropriate radius, and its outer dimension g is as shown in FIG.
Are formed so as to be substantially equal to the interval between the plane portions 8 and 8A.

In FIG. 1A, the valve mounting surfaces 4 and 4A of the shafts 3 and 3A are flush with each other, that is, the plane portion 8 when the shafts 3 and 3A are arranged coaxially. The external dimension g is set so as to be substantially equal to the interval of 8A.

Each of the clip portions 12 and 12 has a portion extending on both outer sides of the parallel portion 11 of the leaf spring material so as to form a semilunar space between each of the pieces 11 a and 11 a of the parallel portion 11. , And are formed by inverting and bending into an inward arc.
The maximum distance between the outer surfaces of the pieces 11a, 11a of the parallel portion 11 and the inner surfaces of the clip portions 12, 12 is smaller than the thickness of the semi-lunar cross-section of the ends 7, 7A shown in FIG. Has a free shape.

Clearances 13, 13 in which the distance between the parallel parts 11 is reduced are provided at the distal ends of the clip parts 12, 12, and the guide part 1 is provided to facilitate mounting of the shaft coupling 10.
4, 14 are bent.

1 (a) and 1 (b), the distance between the flat portions 8 and 8A is substantially determined by the external dimension g of the parallel portion 11 of the shaft coupling 10, as described above. The valve mounting surfaces 4 and 4A are on the same plane, and both valve shafts 3 and 3A are disposed on the body shaft.

In this state, the radial gap h between the valve mounting surfaces 4, 4A and the flat portions 8, 8A is set to be slightly larger than the thickness of the valve. Note that reference numeral 1
The space indicated by 5 is a space provided in the valve body (body) 1 for mounting the shaft coupling 10.

In the assembling procedure, first, the valve shaft is passed through the shaft hole of the body (valve body), then the valve is attached to the valve shaft with a screw, and a shaft coupling is attached to connect the two valve shafts.

[0032]

Since the intake air control valve interlocking device for a multi-cylinder internal combustion engine according to the present invention is constructed as described above, the ends of the two valve shafts connected to each other do not abut each other via a gap. Therefore, the shape of the connecting device is reduced, and the mounting space can be reduced. That is, the space between the valves can be reduced.

The function of absorbing a change in axial dimension such as a difference in thermal expansion due to a change in temperature has the advantage of being provided in the same manner as in the prior art. According to the second aspect of the present invention, the opening degrees of the interlocking valves are more preferably matched.

According to the third aspect of the present invention, the outer pieces of the parallel portion of the shaft coupling can be further spaced, so that the leaf spring material can be bent with a radius R at the center. There is no possibility that the bent portion is broken, and it is easy to insert the folded portion during assembly.

Further, according to the fourth aspect of the present invention, there is no possibility that one of the valve shafts interferes with a valve attached to the other valve shaft.

[Brief description of the drawings]

FIGS. 1A and 1B are enlarged cross-sectional views of a main part of an embodiment of the present invention, and FIG. 1B is an HH cross-sectional view of FIG.

2 (a) is a cross-sectional view of one valve shaft of FIG. 1 (a),
FIG. 2B is a right side view of FIG.

FIG. 3 is a plan view of the embodiment of the present invention.

FIGS. 4A and 4B are diagrams showing a part of the prior art, wherein FIG. 4A is an enlarged cross-sectional view, and FIG. 4B is a cross-sectional view taken along line GG of FIG.

[Explanation of symbols]

3, 3A Valve shaft 4, 4A Valve mounting surface 5, 5A Intake air control valve (valve) 7, 7A End 8, 8A Flat part 10 Shaft coupling 11 Parallel part 11a Each piece of parallel part h Radial gap

Claims (4)

[Claims] 1. An interlocking device for connecting a plurality of valve shafts with a shaft coupling made of a substantially M-shaped spring member, wherein the valve shafts each having a semilunar cross-section to which an intake air control valve is attached are coaxial with each other, In addition, the valve mounting surfaces are arranged in opposite directions, and the ends of both valve shafts are positioned in the axial direction such that their flat portions face each other. An interlocking device for an intake air control valve of a multi-cylinder internal combustion engine, which is connected. 2. The interlocking device for an intake air control valve of a multi-cylinder internal combustion engine according to claim 1, wherein the valve mounting surfaces of the respective valve shafts are substantially in the same plane. 3. The intake air for a multi-cylinder internal combustion engine according to claim 2, wherein a flat portion of the valve shaft abutting on a parallel portion of the shaft coupling is retreated in a radial direction from a valve mounting surface of each valve shaft. Control valve interlocking device. 4. A radial gap between a flat portion of one of the valve shafts abutting on a parallel portion of the shaft coupling and a valve mounting surface of the other valve shaft connected to the one of the valve shafts is determined by the thickness of the valve. 4. The interlocking device for an intake air control valve of a multi-cylinder internal combustion engine according to claim 2, wherein the interlocking valve is set to a large value.