JP3408952B2 - Air flow control 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 air amount control device used in an internal combustion engine having a plurality of cylinders, for example.

[0002]

2. Description of the Related Art In general, an air amount control device for an internal combustion engine having a plurality of cylinders has a cylindrical shape, and a pair of left and right main bodies that are adjacent to each other so that their axes are parallel to each other. An interlocking shaft penetrating therethrough and a throttle valve that is supported by the interlocking shaft in the main body and that opens and closes as the interlocking shaft rotates.

When mounting the interlocking shaft to the main body, it is necessary to position the interlocking shaft with respect to the main body in the left-right direction after inserting the interlocking shaft into the main body. Conventionally, as a positioning method, (1) one of the bearings that supports the interlocking shaft on the left and right sides of the main body is used as a reference, and the interlocking shaft is positioned by supporting one end of the interlocking shaft with this bearing. . (2) Position the interlocking shaft by engaging both ends of the interlocking shaft with both bearings that support the interlocking shaft on the left and right sides of the main body. There are two known methods.

[0004]

By the way, generally, an aluminum alloy is used for the main body of the air amount control device, and an iron-based material is used for the interlocking shaft. In contrast, the above
In the method of (1), since the interlocking shaft is positioned at one end of the interlocking shaft, due to the difference in the coefficient of thermal expansion between the aluminum alloy and the iron, the interlocking shaft becomes relatively closer to the main body toward the other end of the interlocking shaft. The position may be displaced, and as a result, the throttle valve may come into contact with the main body, which may hinder the opening and closing of the throttle valve.

Therefore, measures have been taken such as increasing the clearance between the throttle valve and the main body to prevent contact between them and using a material having a coefficient of thermal expansion similar to that of aluminum alloy for the interlocking shaft.
It

On the other hand, in the method (2), the work process is complicated because both ends of the interlocking shaft are engaged with both bearings, and the bearing is used for both axial support and positioning of the interlocking shaft. The fitting accuracy between the shaft and the bearing must be set high, resulting in an increase in cost and difficulty in quality control.

The present invention has been made in view of the above circumstances, and solves the problem of the positional deviation of the throttle valve due to the difference in the coefficient of thermal expansion when the aluminum alloy and the iron-based material are used for the main body and the interlocking shaft, respectively. Its purpose is to make it possible to position the interlocking shaft in the left-right direction easily and at low cost.

[0008]

DISCLOSURE OF THE INVENTION The present invention has a cylindrical shape and is adjacent to each other with their axes parallel to each other. In an air amount control device having a single interlocking shaft that penetrates through the main body and a throttle valve that is supported by the interlocking shaft in the main body and that opens and closes as the interlocking shaft rotates, the interlocking operation between the pair of main bodies A collar attached to the interlocking shaft at the exposed portion of the shaft at a substantially central portion in the longitudinal direction of the interlocking shaft.
The positioning means for positioning the lateral direction of the interlocking shaft relative to the body is provided by the
The positioning means includes one end face thereof and the one end face of the main body.
For positioning by abutting the side surface opposite to
It is set to its features to be urged from the one longitudinal end of the follower shaft.

By providing the positioning means approximately at the center in the longitudinal direction of the interlocking shaft, the distance from the positioning means to both ends of the interlocking shaft is shortened. As a result, even if a long interlocking shaft that penetrates through the pair of left and right main bodies is used, and the main body and the interlocking shaft are made of a material having a large difference in thermal expansion coefficient, the main body accompanying the thermal expansion during use is used. The relative displacement of the interlocking shaft with respect to is small.

[0010]

Further, one end surface of the collar and a side surface of the main body may be brought into contact with each other via a washer rotatably attached to the interlocking shaft.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An air amount control device according to the present invention will be described below with reference to the drawings. An example of the air quantity control device according to the present invention is shown in FIG. Reference numeral 1 is a main body of the air amount control device. The main body 1 is a pair of left and right cylindrical members, which are adjacent to each other so that their axes are parallel to each other, and are connected by stays 1a and 1b which are integral with the main body 1.

Reference numeral 2 is an interlocking shaft, and the interlocking shaft 2 is a rod-shaped member penetrating the pair of main bodies 1 across the left and right.
A drive mechanism 3 and a lever 4 for rotating the interlocking shaft 2 are installed at one end (the right end in the drawing) and the other end (the left end in the drawing), respectively. Reference numeral 5 is a throttle valve that is supported by the interlocking shaft in the main body 1 and that opens and closes as the interlocking shaft 2 rotates. The throttle valve 5 is inserted into a slit 2a extending leftward and rightward on the interlocking shaft 2 and further fixed to the interlocking shaft 2 with a screw 6 or the like.

On the other hand, reference numeral 7 is a collar (positioning means) mounted on the interlocking shaft 2 at an exposed portion of the interlocking shaft 2 between the pair of main bodies 1, that is, at a substantially central portion in the longitudinal direction of the interlocking shaft 2. is there. The collar 7 is fixed to the interlocking shaft 2 with a screw 8 or a press-fitting pin, and the interlocking shaft 2 is provided between one end face of the collar 7 (the end face on the right side in the drawing) and the side face of the main body 1 facing the one end face. A washer 9 which is rotatably attached to the shaft 2 is interposed between the two.

The position of the collar 7 is such that one end face of the collar 7 and the side face of the main body 1 facing the one end face are in contact with each other via the washer 9, and the interlocking shaft 2 with respect to the main body 1 is positioned. The right and left positions of the are set to be appropriate. Further, reference numeral 10 is a spring (biasing means) which is mounted on the interlocking shaft 2 between one end of the main body 1 and the drive mechanism 3 and urges the interlocking shaft 2 toward one end.

When assembling the air amount control device, first,
After disposing the collar 7 and the washer 9 between the pair of main bodies 1, the interlocking shaft 2 is inserted through the main body 1, the collar 7 and the washer 9 in the order shown in FIG. Next, the collar 7 is positioned so that the position of the interlocking shaft 2 with respect to the main body 1 in the left-right direction is appropriate when the one end surface of the collar 7 and the side surface of the main body 1 are brought into contact with each other via the washer 9. Interlocking axis 2
Fixed to. Then, the spring 10 and the drive mechanism 3 are installed on one end side of the interlocking shaft 2, and the lever 4 is installed on the other end side of the interlocking shaft 2, thereby forming an air amount control device.

In the air amount control device according to the present invention, as described above, the collar 7 is provided at the substantially central portion in the longitudinal direction of the interlocking shaft 2.
The lateral position of the interlocking shaft 2 with respect to the main body 1 is positioned with reference to the contact position between the main body 1 and the main body 1. Therefore, the distance from the reference position in positioning the interlocking shaft 2 to both ends of the interlocking shaft 2 is shortened.

As a result, a long interlocking shaft 2 penetrating through the pair of left and right main bodies 1 is used, and the main body 1 and the interlocking shaft 2 are made of aluminum alloy and iron-based material having a large difference in coefficient of thermal expansion. Even in such a case, the relative displacement of the interlocking shaft 2 with respect to the main body 1 due to thermal expansion can be small. As a result, the problem of contact between the main body 1 and the throttle valve 5 is prevented and the material of the interlocking shaft 2 does not have to be expensive and inferior in strength, even if the throttle valve 5 is not downsized. .

Further, since the interlocking shaft 2 is biased by the spring 10 toward one end side thereof, that is, the side where one end face of the collar 7 and the side face of the main body 1 are brought into contact with each other, a special member such as a bearing is used. Even if it is not prepared, the position of the interlocking shaft 2 with respect to the main body 1 in the left-right direction is positioned at the proper position, and the interlocking shaft 2 is held at the proper position. As a result, the positioning work of the interlocking shaft 2 in the left-right direction can be performed easily and at low cost.

[0020]

As described above, according to the air amount control device of the present invention, the positioning means for positioning the interlocking shaft with respect to the main body in the left-right direction is provided with the exposed portion of the interlocking shaft, that is, between the pair of main bodies. Since the interlocking shaft is provided substantially at the center in the longitudinal direction, the distance from the positioning means to both ends of the interlocking shaft is shortened.

Therefore, even when a long interlocking shaft penetrating through the pair of right and left main bodies is used and the main body and the interlocking shaft are made of aluminum alloy and iron-based material, which have large differences in thermal expansion coefficient, they can be used. The relative displacement of the interlocking shaft with respect to the main body due to the thermal expansion inside is small, and as a result,
In particular, without reducing the size of the throttle valve, contact between the main body and the throttle valve is prevented, and expensive and inferior strength brass or the like is not used as the material of the interlocking shaft.

Further, the interlocking shaft is provided with a collar by an urging means .
Since we urged the one end face and the side face of the main body to contact ,
Even if no special member such as a bearing is prepared, the position of the interlocking shaft with respect to the main body in the left-right direction is positioned at the proper position, and the interlocking shaft is held at the proper position. As a result, the horizontal positioning work of the interlocking shaft can be performed easily and at low cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of an air amount control device according to the present invention.

[Explanation of symbols]

1 body 2 interlocking axes 5 throttle 7 colors (positioning means) 9 washers 10 Spring (biasing means)

Continuation of front page (56) Reference JP-A-7-19072 (JP, A) JP-A-2-211337 (JP, A) JP-A-7-158458 (JP, A) JP-A-2-61331 (JP , A) JP 2-64235 (JP, A) JP 1-249931 (JP, A) JP 7-293285 (JP, A) JP 7-42578 (JP, A) JP 6-185377 (JP, A) JP 10-131774 (JP, A) JP 8-210188 (JP, A) Actually open 63-118335 (JP, U) Actually open 4-104141 (JP, U) Actually open 62-52250 (JP, U) Actually open 3-19438 (JP, U) Actually open 4-27132 (JP, U) Actually open 58-186144 (JP, U) Actually open 58 −154827 (JP, U) Actual development Sho 60-77731 (JP, U) Actual development Hei 5-36048 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F02D 9/00- 11/10

Claims (2)

(57) [Claims] 1. A pair of left and right main bodies which are cylindrical and adjoin so that their axes are parallel to each other and which are integrally formed, and a single interlocking shaft that passes through these main bodies laterally. And an throttle valve that is supported by the interlocking shaft in the main body and that opens and closes in accordance with the rotation of the interlocking shaft, wherein the interlocking shaft is provided at an exposed portion of the interlocking shaft between the pair of main bodies. It is attached to the interlocking shaft at approximately the center in the longitudinal direction of the shaft.
Positioning means is provided for positioning the interlocking shaft with respect to the main body in the left-right direction by the collar, and the positioning means has one end surface thereof and the one of the main body.
For positioning by abutting the end face and the opposite side surface,
The air amount control device is urged from one end side in the longitudinal direction of the interlocking shaft . Wherein one end face of the collar and the side surface of said body, an air amount control apparatus according to claim 1, wherein the contact via the rotatably mounted around been washer to the interlocked shaft .