JP2021038752A - Throttle device - Google Patents

Abstract

To provide a technology which can suppress the enlargement of a spring while securing an area of an abutting portion at the energization of a valve body.SOLUTION: A coil spring for energizing a valve body comprises: a first spring part which is arranged in an intermediate position from one end of the coil spring, and energizes a valve body toward an initial opening when the valve body rotates to a direction in which the valve body is opened from the initial opening; a second spring part which is arranged in the intermediate position from the other end of the coil spring, and energizes the valve body toward the initial opening when the valve body rotates to a direction in which the valve body is closed from the initial opening; and a first abutment part which is arranged along the second spring part at the outside of the second spring part. At least either of a throttle main body and a throttle gear may comprise a second abutment part which abuts on the first abutment part when the valve body is maintained in the initial opening.SELECTED DRAWING: Figure 5

Description

This specification relates to a throttle device mounted on an automobile or the like.

Patent Document 1 discloses a throttle device. The throttle device includes a spring that urges the valve body to opener opening. The spring includes a second spring portion that urges the valve body toward the opener opening when the valve body moves from the opener opening in the closing direction. When the valve body moves from the opener opening in the closing direction, the second spring portion is pressed by the stopper and elastically deformed. The second spring portion urges the valve body by the restoring force against elastic deformation.

Japanese Unexamined Patent Publication No. 2013-185489

In the above technique, when the valve body rotates in the opening direction from the opener opening degree, the second spring portion separates from the stopper. As a result, when the valve body returns to the opener opening degree, the second spring portion collides with the stopper. As a result, the portion where the second spring portion and the stopper come into contact with each other is likely to be worn. Therefore, it is desired to reduce the pressure applied from the spring to the stopper. On the other hand, in order to reduce the pressure, it is desired to avoid increasing the size of the spring by expanding the area of the portion that comes into contact with the valve body when urging.

The present specification provides a technique capable of suppressing an increase in the size of a spring while securing an area of a portion that comes into contact with the valve body when it is urged.

The techniques disclosed herein relate to throttle devices. The throttle device includes a throttle body, a valve body rotatably supported by the throttle body, a throttle gear for rotating the valve body, and a coil spring for urging the valve body. The spring is arranged at an intermediate position from one end of the coil spring, and when the valve body rotates in the opening direction from the initial opening degree, the first spring portion that urges the valve body toward the initial opening degree. And, when the valve body is arranged at the intermediate position from the other end of the coil spring and the valve body rotates in the closing direction from the initial opening degree, the valve body is urged toward the initial opening degree. The spring portion, the first contact portion arranged outside the second spring portion along the second spring portion, and one of the first contact portion with the end of the first spring portion on the intermediate position side. A connecting portion having a pair of connecting portions connecting the portions and the other connecting the end opposite to the intermediate position of the second spring portion and the first contact portion. At least one of the throttle body and the throttle gear may be provided with a second contact portion that comes into contact with the first contact portion when the valve body is maintained at the initial opening degree. ..

According to this configuration, the first contact portion of the coil spring that comes into contact with the second contact portion can be arranged along the second spring portion. According to this configuration, it is possible to secure the length of the first contact portion while suppressing the increase in the total length of the coil spring. Further, it is possible to prevent the coil spring from expanding in the radial direction. According to this configuration, by securing the length of the first contact portion, which is the portion that contacts when the valve body is urged, the area where the first contact portion and the second contact portion abut is secured. At the same time, it is possible to suppress the increase in size of the spring.

The second contact portion may include a main body-side contact portion arranged on the throttle main body and a gear-side contact portion arranged on the throttle gear. The main body side contact portion and the gear side contact portion are arranged side by side in the radial direction of the coil spring at the initial opening degree, and the first contact portion is the main body side contact portion. It may have a shape that straddles the gear-side contact portion. According to this configuration, the contact area between the first contact portion and the second contact portion is expanded by contacting the first contact portion with both the main body side contact portion and the gear side contact portion. Can be done.

The perspective view of the throttle device is shown. A perspective view of the throttle device of the first embodiment excluding the throttle body is shown. The perspective view of the coil spring of 1st Example is shown. The perspective view of the state which removed the cover of the throttle device of 1st Example is shown. A side view of the coil spring and the throttle gear of the first embodiment is shown. The perspective view of the state which removed the cover of the throttle device of 2nd Example is shown. A side view of the coil spring and the throttle gear of the second embodiment is shown. The perspective view of the valve body, the coil spring and the throttle gear of the 2nd Example is shown. The perspective view of the coil spring of the 3rd Example is shown. The perspective view of the coil spring of the modification is shown.

(First Example)
(Throttle device configuration)
The throttle device 10 of this embodiment will be described with reference to FIGS. 1 to 5. The throttle device 10 is mounted on a vehicle having an internal combustion engine such as an automobile. The throttle device 10 is arranged on the intake path of the vehicle. The throttle device 10 opens and closes the intake path according to an instruction from the vehicle's ECU (abbreviation of Engine Control Unit: not shown).

As shown in FIGS. 1 and 2, the throttle device 10 includes a throttle body 12, a valve body 16, a valve shaft 18, a throttle gear 20, intermediate gears 21 and 22, a motor gear 24, and a motor 26. A coil spring 30 is provided.

The throttle body 12 includes a valve body 13 and a cover 14. The valve body 13 is made of an aluminum alloy. The valve body 13 includes an intake path 13a. The intake path 13a is connected to the intake path of the vehicle. The intake path 13a penetrates the valve body 13.

The valve body 13 houses the motor 26, the coil spring 30, the throttle gear 20, the intermediate gears 21 and 22, and the motor gear 24. The accommodation space of the valve body 13 is closed by the cover 14. The cover 14 is made of resin.

The throttle body 12 rotatably supports the valve body 16 via the valve shaft 18. The valve shaft 18 is rotatably supported by the throttle body 12. The valve body 16 is arranged in the intake path 13a. The valve body 16 is arranged parallel to the central axis of the intake path 13a from a fully closed state in which the intake path 13a is completely closed by rotating around the valve shaft 18 with respect to the valve body 13 ( In the following, it can rotate with an opening degree between (referred to as "fully open state").

A throttle gear 20 is fixed to one end of the valve shaft 18. The throttle gear 20 is made of resin. The throttle gear 20 is fixed to one end of the valve shaft 18 and is rotatably supported by the throttle body 12. The throttle gear 20 meshes with the intermediate gear 21. The intermediate gear 21 is fixed adjacent to the intermediate gear 22. The intermediate gear 22 meshes with the motor gear 24. The intermediate gears 21 and 22 are rotatably supported by the throttle body 12.

The motor gear 24 is fixed to the drive shaft of the motor 26. The motor 26 is driven according to a signal from the ECU. When the motor 26 is driven, the drive shaft rotates. As a result, the throttle gear 20 is rotated via the motor gear 24 and the intermediate gears 21 and 22. As a result, the valve body 16 is rotated around the valve shaft 18 via the valve shaft 18. The motor gear 24 and the intermediate gears 21 and 22 are made of the same resin as the throttle gear 20.

A coil spring 30 is attached to the throttle gear 20. The coil spring 30 is arranged coaxially with the valve shaft 18. FIG. 3 shows a perspective view of the coil spring 30. The coil spring 30 includes a first spring portion 32, a second spring portion 34, and a connecting portion 36. The first spring portion 32 spirally extends from the body side end portion 32a to the intermediate position of the coil spring 30. A second spring portion 34 is arranged on the cover 14 side of the first spring portion 32. The second spring portion 34 spirally extends from the body side end portion 34a located at the intermediate position of the coil spring 30 to the end on the cover 14 side of the coil spring 30.

The first spring portion 32 and the second spring portion 34 are connected by a connecting portion 36. The connecting portion 36 is connected to each of the cover side end portion 34b of the second spring portion 34 and the intermediate position side end portion 32b of the coil spring 30 of the first spring portion 32. The connecting portion 36 is a contact portion 36b that connects a pair of connecting portions 36a extending in the radial direction of the coil spring 30 from each of the cover side end portion 34b and the intermediate position side end portion 32b and the connecting portion 36a (“first hit”. An example of a "contact part") is provided. The contact portion 36b is arranged outside the second spring portion 34 and parallel to the axial direction of the second spring portion 34, that is, the axial direction of the coil spring 30.

As shown in FIGS. 4 and 5, the coil spring 30 is slidably arranged on the cylindrical guide portion 20a arranged at the center of rotation of the throttle gear 20 via the guide member 40. The coil spring 30 maintains the valve body 16 in a state of being slightly opened from the fully closed state while the throttle device 10 is not energized. Hereinafter, the opening degree of the valve body 16 in a state where the throttle device 10 is not energized is referred to as an “initial opening degree”. FIG. 4 shows the state of the coil spring 30 and the valve body 13 at the initial opening degree. FIG. 5 shows the states of the coil spring 30 and the throttle gear 20 at the initial opening degree.

At the initial opening degree, the connecting portion 36a of the connecting portion 36 is in contact with the abutting portion 20b of the throttle gear 20. Further, the contact portion 36b of the connecting portion 36 is in contact with the contact portion 13c (an example of the "second contact portion") of the valve body 13. Further, the body side end portion 34a of the second spring portion 34 is in contact with the contact portion 20c of the throttle gear 20. The second spring portion 34 is attached to the throttle gear 20 in a state of being elastically deformed in a direction in which the inner diameter of the second spring portion 34 becomes smaller. Although not shown, the body-side end 32a of the first spring portion 32 is in contact with the valve body 13. Thereby, the initial opening degree is determined.

When the valve body 16 rotates in the closing direction from the initial opening (clockwise in FIG. 4 and counterclockwise in FIG. 5), the contact portion 20c makes the body side end portion 34a counterclockwise in FIG. Press. The connecting portion 36 is brought into contact with the abutting portion 13c of the valve body 13 and movement is prohibited. As a result, when the valve body 16 rotates in the closing direction, the second spring portion 34 is deformed so that its inner diameter becomes smaller. As a result, the valve body 16 is urged toward the initial opening degree by the second spring portion 34. When the valve body 16 rotates in the closing direction from the initial opening degree, the stopper mechanism (for example, a mechanism in which a part of the valve body 13 and a part of the throttle gear 20 come into contact with each other) is used in a preset fully closed state. The rotation of the valve body 16 is restricted.

On the other hand, when the valve body 16 rotates in the opening direction from the initial opening (counterclockwise in FIG. 4 and clockwise in FIG. 5), the contact portion 20b presses the connecting portion 36 clockwise in FIG. To do. The body-side end 32a of the first spring portion 32 is in contact with the valve body 13 and is prohibited from moving clockwise. As a result, when the valve body 16 rotates in the opening direction, the first spring portion 32 is deformed so that its inner diameter becomes smaller. As a result, the valve body 16 is urged toward the initial opening degree by the first spring portion 32.

In this configuration, when the valve body 16 rotates in the opening direction, the contact portion 36b is separated from the contact portion 13c of the valve body 13. As a result, when the valve body 16 returns from the state of being opened more than the initial opening to the initial opening, the contact portion 36b and the contact portion 13c collide with each other due to the restoring force of the first spring portion 32. Therefore, the contact portion 36b and the contact portion 13c are easily worn. If the contact portion 36b and the contact portion 13c are worn, the initial opening degree cannot be maintained. The initial opening degree is, for example, an opening degree required to secure intake air in a situation where the throttle device 10 does not operate normally. If the initial opening degree cannot be maintained, it may not be possible to secure intake air in a situation where the throttle device 10 does not operate normally. Therefore, it is desired to suppress the wear of the contact portion 36b and the contact portion 20b and avoid the situation where the initial opening degree cannot be maintained.

In FIG. 3, a schematic view of the contact portion 20b and the contact portion 13c is shown by a broken line. In the coil spring 30, the contact portion 36b of the connecting portion 36 is arranged outside the second spring portion 34 and parallel to the axial direction of the second spring portion 34. An area where the contact portion 36b and the contact portion 13c come into contact with each other can be secured along the axial direction of the second spring portion 34. As a result, wear between the contact portion 36b and the contact portion 13c can be suppressed. Further, the overall length of the coil spring 30 can be shortened as compared with the configuration in which the contact portion 36b is arranged between the first spring portion 32 and the second spring 34 portion. Further, the radial direction of the coil spring 30 can be reduced as compared with the configuration in which the contact portion 36b is arranged along the radial direction of the coil spring 30. As a result, it is possible to prevent the throttle device 10 from becoming large.

(Second Example)
The second embodiment will be described with reference to FIGS. 6 to 8. In this embodiment, the contact portion 20b of the throttle gear 20 (an example of the "second contact portion") comes into contact with the contact portion 36b of the connecting portion 36. On the other hand, the valve body 13 includes an abutting portion 13b that abuts the connecting portion 36a of the connecting portion 36. On the other hand, the valve body 13 is not in contact with the contact portion 36b of the connecting portion 36.

In this configuration, when the valve body 16 rotates in the closing direction (counterclockwise in FIG. 7), the contact portion 13b of the valve body 13 prohibits the movement of the connecting portion 36, so that the contact portion 36b is throttled. It is separated from the contact portion 20b of the gear 20. As a result, when the valve body 16 returns to the initial opening from the state where the valve body 16 is closed from the initial opening, the contact portion 36b and the contact portion 20b collide with each other due to the restoring force of the second spring portion 34. Therefore, the contact portion 36b and the contact portion 20b are easily worn. In the throttle device 10 of the present embodiment, the area where the contact portion 36b and the contact portion 20b come into contact with each other can be secured along the axial direction of the second spring portion 34. As a result, wear between the contact portion 36b and the contact portion 20b can be suppressed.

(Third Example)
A third embodiment will be described with reference to FIG. In this embodiment, in the coil spring 30, the contact portion 36b of the connecting portion 36 is curved toward the second spring portion 34 side. The contact portion 36b extends along the axial direction of the second spring portion 34 and also extends along the radial direction of the second spring portion 34. The contact portion 36b contacts the contact portion 20b of the throttle gear 20 (an example of the “gear side contact portion”), and at the initial opening degree, the contact portion 20b and the second spring portion 34 are aligned in the radial direction. It also contacts the contact portion 13b (an example of the "main body side contact portion") of the valve body 13 arranged in.

According to this configuration, the abutting portion 36b has a shape straddling the abutting portions 20b and 13b, and the area where the abutting portion 36b and the abutting portions 20b and 13b abut can be made larger. In the modified example, the valve body 13 may include the contact portion 13c instead of the contact portion 13b, as in the second embodiment. At the initial opening degree, the contact portion 36b may be in contact with both the contact portion 20b and the contact portion 13c.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.

(1) The shape of the connecting portion 36 is not limited to the shape of the above embodiment. For example, as shown in FIG. 10, the contact portion 36b may have a flat plate shape. Similarly, the connecting portion 36a is not limited to the shape of the above embodiment, and may be bent or may have a flat plate shape, for example.

(2) The contact portion 20b may be formed separately from the other portion of the throttle gear 20 and may be fixed to the other portion of the throttle gear 20. In this case, the contact portion 20b may be made of a material having higher wear resistance than other portions of the throttle gear 20.

(3) The contact portions 13b and 13c may be formed separately from the other portion of the valve body 13 and may be fixed to the other portion of the valve body 13. In this case, the contact portions 13b and 13c may be screwed with respect to other parts of the valve body 13 and their positions may be adjustable.

In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or drawings can achieve a plurality of purposes at the same time, and achieving one of the purposes itself has technical usefulness.

10: Throttle device 12: Throttle body 13: Valve body 13a: Intake path 13b: Contact part 13c: Contact part 14: Cover 16: Valve body 18: Valve shaft 20: Throttle gear 20a: Guide part 20b: Contact part 20c: Contact portion 21: Intermediate gear 22: Intermediate gear 24: Motor gear 26: Motor 30: Coil spring 32: First spring portion 32a: Body side end portion 32b: Intermediate position side end portion 34: Second spring portion 34a: Body side end 34b: Cover side end 36: Connecting part 36a: Connecting part 36b: Contact part 40: Guide member

Claims (2)

Throttle body and
A valve body rotatably supported by the throttle body and
The throttle gear that rotates the valve body and
A coil spring for urging the valve body is provided.
The coil spring
A first spring portion that is arranged at an intermediate position from one end of the coil spring and that urges the valve body toward the initial opening when the valve body rotates in the opening direction from the initial opening.
A second spring portion that is arranged at the intermediate position from the other end of the coil spring and that urges the valve body toward the initial opening when the valve body rotates in a closing direction from the initial opening. When,
The first contact portion arranged along the second spring portion on the outside of the second spring portion, and one connects the end of the first spring portion on the intermediate position side and the first contact portion. The other includes a connecting portion including a pair of connecting portions connecting the end opposite to the intermediate position of the second spring portion and the first contact portion.
At least one of the throttle body and the throttle gear includes a second contact portion that comes into contact with the first contact portion when the valve body is maintained at the initial opening degree. The second contact portion includes a main body side contact portion arranged on the throttle body and a gear side contact portion arranged on the throttle gear.
The main body side contact portion and the gear side contact portion are arranged side by side in the radial direction of the coil spring at the initial opening degree.
The throttle device according to claim 1, wherein the first contact portion has a shape straddling the main body side contact portion and the gear side contact portion.

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