JP2005139913A - Throttle control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a throttle gear reliably return to a given opening position by the spring force of a coil spring in such a way that poor slide is prevented from occurring between a coil spring 40 and a cylinder part 52 of a throttle gear 50. <P>SOLUTION: A throttle control device is mounted on the periphery of the cylinder part 52 of the throttle gear 50, the one end is engaged with a throttle body and the other end with the throttle gear 50, and equipped with the coil spring 40 constituted such that the throttle gear 50 can be returned to a given opening position. A plurality of grooves 53 extending in a direction crossing a spring material are formed in the outer peripheral surface of a cylinder part 52 of the throttle gear 50 and at a portion where the groove can make contact with the spring material of at least the coil spring 40. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a throttle control device used for adjusting an intake air amount of an engine.

A related throttle control device is described in Patent Document 1.
As shown in FIG. 6A, the throttle control device drives a reduction gear mechanism (motor pinion 92p, counter gear 93, throttle gear 94) by a motor 92, and is connected to the throttle gear 94 via a shaft 95. The throttle valve 96 is rotated to control the flow rate of the intake air flowing through the intake passage 93 formed in the throttle body 91.
The throttle gear 94 is generally made of resin and includes a cylindrical portion 94t and a fan-shaped gear portion 94w, as shown in FIG. 6B. Around the cylindrical portion 94t of the throttle gear 94, A coiled back spring 98 is mounted in a substantially contact state.

The back spring 98 includes a first coil spring (not shown in FIG. 6) that applies a closing force to the throttle gear 94 when the throttle valve 96 is positioned on the open side of the opener opening position, A second coil spring 99 (see FIG. 6C) that applies an opening force (force in the direction of the arrow) to the throttle gear 94 when the valve 96 is positioned closer to the opener opening position. It is composed of
The second coil spring 99 is configured such that the tip end portion 99f is hooked on the cylindrical portion 94t side of the throttle gear 94, and rotates together with the throttle gear 94. Further, the base end portion 99m of the second coil spring 99 is hooked on the protrusion 91t on the throttle body 91 side when the throttle gear 94 rotates in the closing direction (rightward in FIG. 6C) from the opener opening position. It is configured to be. For this reason, when the throttle gear 94 rotates together with the throttle valve 96 in the closing direction from the opener opening position, the second coil spring 99 is twisted clockwise (in the direction of the white arrow) in FIG. On the other hand, a force in the opening direction (force in the direction of the arrow) is applied. Therefore, for example, even if a malfunction of the motor 92 occurs at the fully closed position of the throttle valve 96, the throttle valve 96 is returned to the opener opening position by the elastic force of the second coil spring 99.

JP 2001-303978 A

  According to the throttle control device described above, the base end portion 99m of the second coil spring 99 and its vicinity are located at the throttle gear 94 when the throttle gear 94 rotates in the closing direction (rightward in FIG. 6) from the opener opening position. It rotates relative to the cylindrical portion 94t. And when the 2nd coil spring 99 and the cylindrical part 94t of the throttle gear 94 rotate relatively, the contact part S of both 99 and 94t slides mutually. Here, in the throttle control device, the back spring 98 resonates due to the vibration of the engine and hits the cylindrical portion 94t of the throttle gear 94, and the cylindrical portion 94t is scraped over time, so that the resin wear powder of about 0.1 to 0.2 mm is obtained. May occur.

  When these wear powder enters the contact portion S (sliding portion S) between the second coil spring 99 and the cylindrical portion 94t of the throttle gear 94, the wear powder is crushed by sliding of both 99 and 94t, and with time. The wear powder sticks to the spring material of the second coil spring 99. As a result, the sliding resistance of the contact portion S between the spring material of the second coil spring 99 and the cylindrical portion 94t of the throttle gear 94 increases, and sliding failure occurs between the second coil spring 99 and the cylindrical portion 94t of the throttle gear 94. May occur. When the sliding failure occurs, for example, even if the motor 92 stops at a fully closed position of the throttle valve 96 due to a failure, the throttle valve 96 and the throttle gear 94 are moved to the opener position by the spring force of the second coil spring 99. You may not be able to return it.

  The present invention has been made to solve the above-described problems, and a technical problem of the present invention is to prevent a sliding failure between the coil spring and the cylindrical portion of the throttle gear so that the throttle gear, etc. Is to be surely returned to a predetermined opening position by the spring force of the coil spring.

The above-described problems are solved by the inventions of the claims.
The invention of claim 1 includes an intake passage formed in the throttle body, and a throttle valve that adjusts the flow rate of intake air flowing in the intake passage by rotating in the opening direction or the closing direction in the intake passage; The throttle valve is coaxially attached to the throttle shaft so as not to rotate relative to the throttle shaft. The throttle gear is provided with a cylindrical portion and a gear portion, and is mounted around the cylindrical portion of the throttle gear. A throttle control device comprising a coil spring engaged with a throttle body, the other end engaged with the throttle gear, and a coil spring configured to be able to return the throttle gear to a predetermined opening position. On the outer peripheral surface of the cylindrical portion, at least in a part that can come into contact with the spring material of the coil spring, in a direction intersecting with the spring material. Wherein the building grooves are plural form.

According to the present invention, on the outer peripheral surface of the cylindrical portion of the throttle gear, a groove extending in a direction intersecting with the spring material is formed at least at a portion that can contact the spring material of the coil spring. For this reason, even if resin wear powder enters the sliding portion between the cylindrical portion of the throttle gear and the spring material of the coil spring, the wear powder falls into the groove, so that it is difficult to adhere to the surface of the spring material of the coil spring. .
Further, since the groove is formed in a direction intersecting with the spring material of the coil spring, even if wear powder adheres to the spring material of the coil spring, when the cylindrical portion of the throttle gear and the coil spring rotate relative to each other, The abrasion powder adhering to the spring material is rubbed against the edge of the groove and falls into the groove.
This makes it difficult for the wear powder to stick to the surface of the spring material of the coil spring. Therefore, it is difficult for sliding failure to occur when the coil spring and the cylindrical portion of the throttle gear rotate relative to each other, and the throttle gear and the like can be reliably returned to the predetermined opening position by the spring force of the coil spring.

According to the second aspect of the present invention, the grooves are parallel to each other, and the grooves are formed at intervals of about θ ° or less in the circumferential direction of the cylindrical portion of the throttle gear. The coil spring is approximately equal to an angle at which the coil spring can rotate relative to the cylindrical portion.
For this reason, the contact portion of the spring material of the coil spring that is in contact with the outer peripheral surface of the cylinder portion of the throttle gear always crosses one groove when the coil spring rotates relative to the cylinder portion of the throttle gear. become. Therefore, the abrasion powder adhering to the contact portion of the spring material of the coil spring is always rubbed against the edge of any one groove and dropped from the spring material. For this reason, it becomes more difficult for the wear powder to adhere to the spring material of the coil spring.

According to the invention of claim 3, the groove is characterized in that the cross-sectional shape is formed in a substantially semicircular shape.
For this reason, it becomes easy to form a groove in the cylindrical portion of the throttle gear.
According to a fourth aspect of the present invention, the depth of the groove is set to about 33% or less of the thickness of the cylindrical portion of the throttle gear. For this reason, the strength of the cylindrical portion of the throttle gear is hardly lowered by forming the groove.

  According to the present invention, when the throttle gear and the throttle valve are returned to the predetermined opening position by the spring force of the coil spring, it becomes difficult for malfunction to occur.

(Embodiment 1)
Hereinafter, the throttle control device according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. Here, FIG. 1 is an overall plan sectional view of the throttle control device according to the present embodiment, and FIG. 2 is a view taken in the direction of arrows II-II in FIG. 3 and 4 are side views showing a throttle gear and a back spring of the throttle control device, and FIG. 5 is an enlarged view of a groove formed in the throttle gear.
The throttle control device is a device that controls the amount of intake air flowing through the intake passage in the intake system of the engine, and includes a throttle body 1 made of resin, for example, as shown in FIG.

  The throttle body 1 has a bore portion 20 and a motor housing portion 24 integrally. The bore portion 20 is formed with a substantially hollow cylindrical intake passage 1a penetrating in the vertical direction (perpendicular to the paper surface in FIG. 1). An air cleaner (not shown) is connected to the upper portion of the bore portion 20, and an intake manifold (not shown) is connected to the lower portion of the bore portion 20. The bore portion 20 is provided with a metal throttle shaft 9 that traverses the intake passage 1a in the radial direction.

As shown in FIG. 1, the throttle shaft 9 is rotatably supported by the left and right bearings 8 and 10 with respect to the left and right bearing portions 21 and 22 formed integrally with the bore portion 20 of the throttle body 1.
A throttle valve 2 capable of opening and closing the intake passage 1a by rotation is fixed to the throttle shaft 9 by screws 3. The throttle valve 2 adjusts the opening degree of the intake passage 1a by driving a motor 4 (described later), thereby controlling the amount of intake air flowing through the intake passage 1a.

  The bearing portion 21 corresponding to one end portion 9a (left side in FIG. 1) of the throttle shaft 9 is fitted with a plug 7 that seals the end portion 9a in the bore portion 20. Further, the other end portion 9 b (right side in FIG. 1) of the throttle shaft 9 passes through the bearing portion 22. A throttle gear 50 constituting a reduction gear mechanism, which will be described later, is fixed coaxially to the other end portion 9b of the throttle shaft 9 (see FIG. 2).

  As shown in FIG. 1, the motor housing portion 24 of the throttle body 1 is formed in a substantially bottomed cylindrical shape parallel to the rotation axis L of the throttle shaft 9. Inside the motor housing portion 24 is a motor housing space 24 a that opens to the right of the throttle body 1. A motor 4 made of, for example, a DC motor is accommodated in the motor accommodating space 24a. The motor 4 is housed in the motor housing space 24a so that the front side is positioned on the opening side of the motor housing space 24a. A mounting flange 29 is provided on the front side (right end side in FIG. 1) of the motor casing 28 that forms the outline of the motor 4, and the mounting flange 29 is fixed to the motor housing portion 24.

  As shown in FIG. 2, a motor pinion 32 is provided on the output rotation shaft 4 a of the motor 4. Further, as shown in FIG. 1, the throttle body 1 is provided with a counter shaft 34 parallel to the rotation axis L of the throttle shaft 9 between the bore portion 20 and the motor housing portion 24. The counter gear 14 is rotatably supported on the counter shaft 34. The counter gear 14 has two gear portions 14a and 14b having different gear diameters, and the large-diameter side gear portion 14a is engaged with the motor pinion 32 as shown in FIG. 2, and the small-diameter side gear portion. 14 b is engaged with the throttle gear 50. That is, the motor pinion 32, the counter gear 14, and the throttle gear 50 constitute a reduction gear mechanism.

  Therefore, when the motor 4 rotates in the forward direction or the reverse direction, the rotational force of the motor 4 is transmitted to the throttle shaft 9 and the throttle valve 2 via the motor pinion 32, the counter gear 14, and the throttle gear 50. The throttle valve 2 is rotated in the direction of opening the intake passage 1a (opening direction) or the direction of closing the intake passage 1a (closing direction).

As shown in FIG. 1, a cover 18 that covers a reduction gear mechanism including a motor pinion 32, a counter gear 14, and a throttle gear 50 is attached to the right side surface of the throttle body 1. The cover 18 is formed with a recess 18 j that receives the end of the countershaft 34 at a position corresponding to the countershaft 34.
Further, a rotation angle sensor 38 that detects the rotation angle of the throttle valve 2 is attached to the cover 18.

The throttle gear 50 constituting the reduction gear mechanism is made of resin and includes a cylindrical portion 52 and a fan-shaped gear portion 54 provided at one end of the cylindrical portion 52 (right end in FIG. 1). The cylindrical portion 52 of the throttle gear 50 is a portion that supports a coiled back spring 40 (described later) from the inside, and is configured to be fixed to the end 9 b of the throttle shaft 9 coaxially with the throttle shaft 9. Yes. As shown in FIG. 4A, a plurality of linear grooves 53 having a semicircular cross section extending in the axial direction from the vicinity (base end portion) to the tip end of the sector gear portion 54 are formed on the outer peripheral surface of the cylindrical portion 52. Has been.
4A is a front view of the throttle gear 50 as viewed from the direction of arrows IV-IV in FIG. 2, and FIG. 4B is a side view of the throttle gear 50 in FIG. FIG. 4C is a side view showing a state in which the back spring 40 is attached to the cylindrical portion 52 of the throttle gear 50.

In the throttle control device, the back spring 40 resonates due to engine vibration or the like and hits the cylindrical portion 52 of the throttle gear 50, and the cylindrical portion 52 is scraped with time to generate resin wear powder P of about 0.1 to 0.2 mm. There are things to do. The above-described linear groove 53 prevents the wear powder P from entering the sliding portion S between the spring material of the back spring 40 and the cylindrical portion 52 of the throttle gear 50 (see FIGS. 5A and 5B). ) Reference) is a groove for holding. For this reason, the linear groove 53 is formed in a range in which the cylindrical portion 52 of the throttle gear 50 can contact the spring material of the back spring 40. That is, in the throttle control device of the present embodiment, the outer peripheral surface of the cylindrical portion 52 of the throttle gear 50 may come into contact with the spring material of the back spring 40 in a range of about 120 ° in the circumferential direction (a value that allows for a margin). Therefore, the straight groove 53 is formed in this range.
Each linear groove 53 is formed on the outer peripheral surface of the cylindrical portion 52 at equal intervals (approximately 4 ° intervals) in the circumferential direction.

  The cylindrical portion 52 of the throttle gear 50 has a wall thickness of about 1.5 mm, and the linear groove 53 has a depth of about 0.3 mm. Further, since the linear groove 53 is formed in a semicircular cross section as described above, the width dimension of the linear groove 53 is about 0.6 mm. For this reason, even the relatively large wear powder P (about 0.2 mm) can be stored with a margin by these linear grooves 53. Moreover, since the depth dimension of the linear groove 53 is about 20% of the thickness of the cylindrical part 52 of the throttle gear 50, the strength reduction of the cylindrical part 52 due to the provision of the linear groove 53 hardly causes a problem. Note that the depth dimension of the linear groove 53 can be increased to about 33% (about 0.5 mm) of the thickness dimension of the cylindrical portion 52.

  The sector gear portion 54 of the throttle gear 50 includes a gear main body 54m that functions as a reduction gear mechanism, and the gear main body 54m is engaged with the gear portion 14b on the small diameter side of the counter gear 14 (see FIG. 1). . As shown in FIGS. 4B and 4C, a first spring receiver 54k is formed at the end of the gear main body 54m, on which a tip 44f of a second coil spring 44 (described later) of the back spring 40 is hung. Yes. The first spring receiver 54k is provided with a protrusion 54u that functions as a stopper for preventing the distal end portion 44f of the second coil spring 44 from coming off. Further, a second spring receiver 54x on which the base end portions 42m and 44m of the first coil spring 42 are hooked is formed at a position substantially opposite to the first spring receiver 54k of the gear body 54m.

For example, when the power supply to the motor 4 is cut off due to a failure or the like, the back spring 40 has a predetermined opening position (hereinafter referred to as an opener opening position) between the fully open position and the fully closed position of the throttle valve 2 by the spring force. To return to the position).
As shown in the plan view of FIG. 3A, the back spring 40 includes a right-handed first coil spring 42 and a left-handed second coil spring 44 connected to the first coil spring 42. The first coil spring 42 is configured to apply a force in the closing direction to the throttle valve 2 when the throttle valve 2 is positioned on the open side with respect to the opener opening position. The second coil spring 44 is configured to apply a force in the opening direction to the throttle valve 2 when the throttle valve 2 is located closer to the opener opening position.

As shown in FIG. 3A, the first coil spring 42 and the second coil spring 44 are accommodated in the throttle body 1 in a state of covering the cylindrical portion 52 of the throttle gear 50 and the bearing portion 22 of the throttle body 1. (See FIG. 1). And the front-end | tip part 42f of the 1st coil spring 42 is hung on the protrusion 1t of the throttle body 1, as shown in FIG. Further, the tip end portion 44f of the second coil spring 44 is hung on the first spring receiver 54k of the sector gear portion 54 of the throttle gear 50 as described above. Further, the base end portions 42m, 44m of the first coil spring 42 and the second coil spring 44 are hooked on the second spring receiver 54x formed in the sector gear portion 54 of the throttle gear 50 as described above, and the throttle body 1 The stopper 1s is also hung (see FIG. 3B).
Here, FIG. 3 (B) shows a view taken along the arrow BB in FIG. 3 (A).

Next, the operation of the throttle control device described above will be described.
When the driver steps on the accelerator pedal while the automobile engine is started, the motor 4 is driven in the forward direction by a control means such as an ECU. When the motor 4 rotates in the forward direction, the rotation of the motor 4 is transmitted to the throttle gear 11, the throttle shaft 9 and the throttle valve 2 via the motor pinion 32 and the counter gear 14. As a result, the throttle valve 2 and the like rotate in the opening direction (leftward in FIGS. 2 and 3B), the intake passage 1a is opened, and the air flow rate taken into the engine increases.

  When the throttle gear 50 rotates in the opening direction (leftward in FIGS. 2 and 3B) from the opener opening position, the first spring receiver 54k and the second spring receiver 54k formed on the sector gear portion 54 of the throttle gear 50 are rotated. The spring receiver 54x moves in the counterclockwise direction. As a result, the base end portions 42m and 44m of the first coil spring 42 and the second coil spring 44 are pushed by the second spring receiver 54x and rotate leftward. As a result, the first coil spring 42 is twisted counterclockwise between the protrusion 1t (see FIG. 2) of the throttle body 1 and the second spring receiver 54x of the throttle gear 50, and is elastically deformed. As a result, the throttle gear 50 receives a force in the closing direction (force in the clockwise direction) from the first coil spring 42.

For this reason, if the power supply to the motor 4 is cut off due to, for example, a failure or the like when the throttle valve 2 is on the open side with respect to the opener opening position, the throttle gear 11 and the throttle valve 2 are springs of the first coil spring 42. It is returned to the opener position by force.
On the other hand, since the tip end portion 44f of the second coil spring 44 is hooked on the first spring receiver 54k of the throttle gear 50, when the throttle gear 50 rotates counterclockwise, the entire second coil spring 44 rotates counterclockwise. For this reason, the second coil spring 44 does not operate.
That is, when the throttle gear 50 rotates in the opening direction from the opener opening position, the first coil spring 42 and the second coil spring 44 rotate together with the throttle gear 50 (excluding the tip portion 42f of the first coil spring 42). The first coil spring 42 and the second coil spring 44 hardly rotate relative to the cylindrical portion 52 of the throttle gear 50.

  Contrary to the above, when the driver loosens the accelerator pedal during driving, the motor 4 is driven in the reverse direction by the control means such as ECU. As a result, the throttle gear 11 and the throttle valve 2 rotate in the closing direction (rightward in FIGS. 2 and 3B), the opening of the intake passage 1a is reduced, and the air flow rate sucked into the engine is reduced. .

  When the throttle gear 50 rotates in the closing direction (rightward) from the opener opening position, the first spring receiver 54k and the second spring receiver 54x formed on the sector gear portion 54 of the throttle gear 50 are shown in FIGS. In 3 (B), it moves in the clockwise direction. As a result, the tip end portion 44 f of the second coil spring 44 is pushed by the first spring receiver 54 k of the throttle gear 50 and rotates clockwise together with the throttle gear 50. Further, when the second spring receiver 54x of the throttle gear 50 moves in the right direction (closing direction), the base end portion 44m of the second coil spring 44 and the base end portion 42m of the first coil spring 42 become the stopper of the throttle body 1. Multiplied by 1s. As a result, the second coil spring 44 is twisted clockwise between the stopper 1s of the throttle body 1 and the first spring receiver 54k of the throttle gear 50, and is elastically deformed. As a result, the throttle gear 50 receives a force in the opening direction (force in the left rotation direction) from the second coil spring 44.

Therefore, when the power supply to the motor 4 is cut off due to, for example, a failure or the like in a state where the throttle valve 2 is on the closed side with respect to the opener opening position, the throttle gear 11 and the throttle valve 2 are subjected to a spring force of the second coil spring 44 To return to the opener opening position.
At this time, the first coil spring 42 is hung between the stopper 1s of the throttle body 1 and the protrusion 1t, and therefore does not operate.

  As described above, when the throttle gear 50 rotates in the closing direction with respect to the opener opening position, the base ends 42m and 44m of the first coil spring 42 and the second coil spring 44 are held at the position of the stopper 1s of the throttle body 1. Is done. For this reason, the base end portions 42 m and 44 m of the first coil spring 42 and the second coil spring 44 and the vicinity thereof rotate relative to the cylindrical portion 52 of the throttle gear 50. As a result, at the portion where the spring material of the first coil spring 42 and the second coil spring 44 and the cylindrical portion 52 of the throttle gear 50 come into contact with each other, both 44 (42) and 52 come to slide relative to each other. Here, since the throttle gear 50 is set to approximately 6.5 ° from the opener opening position to the fully closed position, the first coil spring 42 and the second coil spring 44 are approximately 6.5 ° with respect to the cylindrical portion 52 of the throttle gear 50. It will slide relative to the amount.

Here, on the outer peripheral surface of the cylindrical portion 52 of the throttle gear 50, a linear groove 53 extending in a direction intersecting with the spring material is formed at least at a portion in contact with the spring material of the coil springs 42 and 44. For this reason, even if resin wear powder P or the like enters the sliding portion S between the cylindrical portion 52 of the throttle gear 50 and the spring material of the coil springs 42 and 44, as shown in FIG. By falling to 53, it becomes difficult to adhere to the surface of the spring material of the coil springs 42 and 44.
Further, even if the wear powder P adheres to the spring material of the coil springs 42 and 44, the throttle gear 50 rotates with respect to the coil springs 42 and 44, for example, in the direction of the white arrow in FIG. As a result, the wear powder P is rubbed at one edge E 1 of the linear groove 53 and falls into the linear groove 53. Further, when the throttle gear 50 rotates in the black arrow direction (opener opening direction) in FIG. 5B, the wear powder P is rubbed at the other edge E <b> 2 of the linear groove 53 and falls into the linear groove 53. It becomes like this.

Here, since the interval between the linear grooves 53 is set to about 4 °, when the throttle gear 50 rotates between the opener opening position and the fully closed position, the spring material of the coil springs 42 and 44 is a straight line. The groove 53 is rubbed at least once with the edges E1 and E2.
For this reason, it becomes difficult for the abrasion powder P to stick to the surface of the spring material of the coil springs 42 and 44. Therefore, when the coil springs 42 and 44 and the cylindrical portion 52 of the throttle gear 50 rotate relative to each other, a sliding failure is unlikely to occur between the both 44 and 52, and the throttle gear 50 and the like are moved by the spring force of the coil springs 42 and 44. It is possible to reliably return to the opener opening position.

Further, since the straight groove 53 has a substantially semicircular cross-sectional shape, it is easy to form a groove in the cylindrical portion 52 of the throttle gear 50.
Further, since the depth dimension of the linear groove 53 is set to about 33% or less (about 20%) of the thickness of the cylindrical portion 52 of the throttle gear 50, the throttle gear 50 is formed by forming the linear groove 53. The strength of the cylindrical portion 52 is hardly lowered.

Note that the present invention is not limited to the above-described embodiment, and can be modified without departing from the gist of the present invention. For example, in the present embodiment, the linear groove 53 is formed along the axial direction of the cylindrical portion 52 of the throttle gear 50. However, the linear groove 53 may be formed obliquely so as to have a predetermined inclination with respect to the axial direction. Is possible. It is also possible to cross the linear groove 53 formed in the oblique direction and the linear groove 53 formed in the oblique direction with the reverse inclination. Further, a curved groove can be used instead of the straight groove 53.
Moreover, although the example which forms the linear groove | channel 53 in cross-sectional semicircle was shown, as shown in FIG.5 (C), it is also possible to form in cross-sectional square shape.
Moreover, although the example which sets the space | interval of the linear groove | channel 53 to about 4 degrees was shown, it is possible to make it slightly larger than about 4 degrees, and to make it slightly small.

It is a whole plane sectional view of the throttle control device concerning this embodiment. It is an II-II arrow line view of FIG. FIG. 3 is a plan view (A diagram) showing a relationship between a throttle gear and a back spring of the throttle control device, and a view taken along the line BB in FIG. 2 is a front view of the throttle gear as viewed from the direction of arrows IV-IV in FIG. 2 (A), a side view of FIG. A as viewed from the BB arrow (viewed from the back side of FIG. 2), and a back spring on the cylindrical portion of the throttle gear. It is a side view (C figure) showing the state which mounted | wore. It is an enlarged view (A, B, C) of the linear groove formed in the cylindrical part of the throttle gear. FIG. 2 is an overall plan sectional view (FIG. A) of a conventional throttle control device, an enlarged plan sectional view (B diagram) showing a throttle gear and a back spring, and an enlarged side view (C diagram) showing a throttle gear and a back spring. .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Throttle body 1a Intake passage 2 Throttle valve 9 Throttle shaft 42 1st coil spring 44 2nd coil spring 50 Throttle gear 52 Cylindrical part 53 Straight groove (groove)
54 Fan-shaped gear (gear)
P wear powder

Claims (4)

An intake passage formed in the throttle body, a throttle valve that adjusts the flow rate of intake air flowing in the intake passage by rotating in the opening direction or the closing direction in the intake passage, and a throttle shaft of the throttle valve It is attached coaxially in a state where relative rotation is impossible, a throttle gear provided with a cylindrical portion and a gear portion, and mounted around the cylindrical portion of the throttle gear, with one end engaged with the throttle body, A throttle control device comprising: a coil spring configured to engage the throttle gear at the other end and return the throttle gear to a predetermined opening position;
A throttle control device, wherein a plurality of grooves extending in a direction intersecting with the spring material are formed at least on a portion that can contact the spring material of the coil spring on the outer peripheral surface of the cylindrical portion of the throttle gear. . The throttle control device according to claim 1,
Each groove is parallel to each other, and these grooves are formed at intervals of about θ ° or less in the circumferential direction of the cylindrical portion of the throttle gear.
The θ ° is substantially equal to an angle at which the coil spring can rotate relative to the cylindrical portion of the throttle gear. The throttle control device according to claim 1 or 2,
A throttle control device characterized in that the groove has a substantially semicircular cross-sectional shape. The throttle control device according to any one of claims 1 to 3,
A throttle control device characterized in that the depth of the groove is set to about 33% or less of the thickness of the cylindrical portion of the slot gear.

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