JP4255961B2 - Throttle control device - Google Patents

Description

  The present invention relates to a throttle control device that electrically controls opening and closing of a throttle valve of an engine.

A conventional example of a throttle control device will be described. 9 is a partial plan view of a conventional throttle control device, FIG. 10 is a partial plan view of an opening state larger than the opener opening degree, FIG. 11 is a cross-sectional view of the same, and FIG. 12 is an opening state smaller than the opener opening degree. A partial plan view is shown, FIG. 13 is a sectional view of the same plane, and FIG. 14 is a characteristic diagram of the operating torque. The basic configuration of the throttle control device described in this conventional example is substantially the same as the basic configuration of the throttle control device described in one embodiment of the present invention, and therefore the same or substantially the same configuration. Possible portions are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 11, a throttle gear 5 is fixed to an end portion of a throttle shaft 2 rotatably provided on the throttle body 1. Further, a relief lever 9 is rotatably provided on the throttle shaft 2 between the throttle body 1 and the throttle gear 5. A predetermined gap exists between the fitting surfaces of the throttle shaft 2 and the relief lever 9 due to the rotation of the relief lever 9, and components adjacent to both sides of the relief lever 9, that is, the throttle body 1 and the throttle gear. There is also a predetermined gap between the opposing surfaces of 5 and the relief lever 9. Therefore, the relief lever 9 may tilt with respect to the throttle shaft 2 as shown in FIG. 11 or FIG.

  As shown in FIG. 11, a back spring 11 is interposed between the throttle body 1 and the relief lever 9. The back spring 11 biases the relief lever 9 against the throttle body 1 in the valve closing direction. A relief spring 10 is interposed between the throttle gear 5 and the relief lever 9. The relief spring 10 biases the throttle gear 5 in the valve opening direction with respect to the relief lever 9.

  As shown in FIG. 9, between the throttle gear 5 and the relief lever 9, a first contact means b that can contact each other at a predetermined rotational position in the valve opening direction of the throttle gear 5 is provided. ing. Further, between the throttle body 1 and the relief lever 9, there is provided second contact means a that can contact each other at a predetermined rotational position of the relief lever 9 in the valve closing direction. The relief lever 9 is engaged with a terminal portion 11 a of the back spring 11.

In the throttle control device described above, when the throttle valve (throttle shaft 2) is controlled to open or close at a predetermined rotational position (this position is also referred to as an opener opening), the first contact means b is in contact with the contact portion. Since the contact is made at B, the relief lever 9 is rotated together with the throttle gear 5 (see FIG. 10). When the throttle shaft 2 is controlled to be opened and closed below the opening of the opener, the second abutting means a abuts at the abutting portion A, so that only the throttle gear 5 can be operated with the relief lever 9 being prevented from rotating. It is rotated (see FIG. 12).

  A configuration similar to the conventional example is disclosed in Patent Document 1.

Japanese Patent No. 2880733

According to the above conventional example, as shown in FIG. 9, a single plane P that is perpendicular to the axis L of the throttle shaft 2 (see FIG. 11), and the restoring force acting position C of the back spring 11 with respect to the relief lever 9 is positioned during, it is arranged separately with the contact portion a of the contact portion B and the second abutment means a first abutment means b is. That is, the contact portion B of the first contact means b is arranged on one side of the one plane P (downward in FIG. 9), and the second portion on the other side of the one plane P (upward in FIG. 9). The contact part A of the contact means a is disposed.

Therefore, the state in which the relief lever 9 is rotated together with the throttle shaft 2 by the first contact means b (see FIG. 10) and the state in which the relief lever 9 is prevented from rotating by the second contact means a (FIG. 12). In the state of “see”, the inclination of the relief lever 9 varies. Specifically, when the opening degree is larger than the opening degree, as shown in FIG. 10, the first abutting means b abuts at the abutting portion B on one side of the plane P (downward in FIG. 9). Then, the relief lever 9 is tilted leftward and downwardly in FIG. Further, in the opening state smaller than the opening degree of the opener, as shown in FIG. 12, the second contact means a comes into contact with the contact part A on the other side of the plane P (upward in FIG. 9). The relief lever 9 is tilted downward in the left direction and upward in FIG.

  For this reason, the operating torque of the throttle valve in the conventional example is represented by a characteristic diagram shown in FIG. In FIG. 14, the horizontal axis indicates the rotational position of the throttle valve (this is referred to as the throttle opening), and the vertical axis indicates the operating torque of the throttle valve. As apparent from FIG. 14, the operating torque is 0 in the opening range between the opening θ2 larger than the opener opening θ and the opening θ1 smaller than the opener opening θ. It can be seen that this is called hysteresis. If this opener opening hysteresis is large, the opener opening θ, which is the reference value of the throttle opening during throttle valve opening / closing control, varies between θ1 and θ2 and becomes unstable. Will be reduced.

  The present invention has been made in order to solve the above-described problems, and the problem to be solved by the present invention is to prevent the fluctuation of the tilt valve accompanying the change in the operating state of the relief lever, thereby An object of the present invention is to provide a throttle control device capable of improving control accuracy.

A first aspect of the present invention that solves the above-described problems is a throttle control device that is summarized in the configuration described in the first aspect of the present invention. With this configuration, the throttle valve is controlled to open and close by driving the control motor, whereby the amount of intake air flowing through the intake passage of the throttle body is adjusted. Thus, when the throttle valve is controlled to open or close at a predetermined rotational position (this position is also referred to as an opener opening), the first abutting means abuts at the abutting portion B, so that the relief together with the throttle gear is performed. The lever is rotated. When the throttle valve is controlled to open and close below the opener opening, the second contact means contacts the contact portion A, so that only the throttle gear is rotated while the relief lever is prevented from rotating. .

By the way, when the drive of the control motor is stopped when the throttle valve is opened beyond the opening of the opener, the throttle gear is rotated in the valve closing direction together with the relief lever by the biasing force of the back spring. The state where the first contact means is in contact with the contact portion B, that is, the throttle valve is closed to the opener opening. Further, when the drive of the control motor is stopped when the throttle valve is closed below the opener opening, the throttle gear is rotated in the valve opening direction by the urging force of the relief spring, and the second contact is made. The state in which the contact means is in contact with the contact portion A, that is, the throttle valve is opened to the opener opening. Thereby, engine starting failure due to freezing in a cold region or the like or adhesion of combustion products or the like is prevented.

Further, the contact portion B of the first contact means and the contact position of the second contact means are placed on a plane perpendicular to the axis of the throttle shaft and where the return spring acting position C of the back spring with respect to the relief lever is located. The contact part A is arranged. For this reason, the relief lever can be operated in either the state where the relief lever is rotated together with the throttle shaft by the first contact means or the state where the relief lever is prevented from rotating by the second contact means. Since the tilt is kept in a prevented state, it is possible to prevent the tilt from being changed due to the change in the operating state of the relief lever. Thereby, the control accuracy of the throttle valve can be improved. Further, as described above, by preventing the relief lever from tilting, it is possible to reduce the frictional force generated during sliding between the relief lever and a component adjacent to the relief lever.

A second aspect of the present invention is a throttle control device having the configuration described in the second aspect of the present invention. According to this throttle control device, the abutting portion B of the first abutting means is arranged on a plane perpendicular to the axis of the throttle shaft and where the back spring return force acting position C is located with respect to the relief lever. Yes.
The invention of claim 3 is a throttle control device having the gist of the configuration described in claim 3 of the claims. According to this throttle control device, the contact portion A of the second contact means is arranged on a plane perpendicular to the axis of the throttle shaft and where the back spring return force acting position C is located with respect to the relief lever. Yes.

  According to the throttle control device of the present invention, the relief lever in which the relief lever is rotated together with the throttle shaft by the first abutting means and the rotation of the relief lever is prevented by the second abutting means. Since it is possible to prevent the inclination from being changed due to the change in the operating state, the control accuracy of the throttle valve can be improved.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the following examples.

Illustrating an embodiment of the present invention with reference to the drawings. 1 is a cross-sectional plan view of the throttle control device, FIG. 2 is a partial front view showing a state of an opener opening, FIG. 3 is a partial plan view thereof, and FIG. 4 is a partial front view showing a state larger than the opener opening. The partial front view which shows a state smaller than an opener opening degree is shown.

  In FIG. 1, the throttle body 1 forms a substantially cylindrical intake passage 1a. The intake passage 1a communicates with the intake system of the engine. A throttle shaft 2 is rotatably supported on the throttle body 1. A throttle valve 13 for opening and closing the intake passage 1a is attached to the throttle shaft 2. The throttle valve 13 is rotated in the counterclockwise direction in FIG. 2 together with the throttle shaft 2 to open the intake passage 1a (see FIG. 1), and is rotated in the clockwise direction in FIG. Thus, the intake passage 1a is closed, and the intake air amount to the engine is adjusted by the opening / closing control.

  A gear housing portion le is formed on a peripheral portion of one side surface (lower side surface in FIG. 1) of the throttle body 1. A gear cover 8 is attached to the opening end surface of the gear housing portion 1e. In the accommodation space 8a surrounded by the gear cover 8, a drive gear 3a, a counter gear 4, a throttle gear 5, a relief lever 9 and the like which will be described later are accommodated.

  As shown in FIG. 1, one end (the lower end in FIG. 1) of the throttle shaft 2 protrudes into the accommodation space 8 a through a boss 1 b formed on one side of the throttle body 1. An engagement shaft portion 2 a having a substantially square cross section is formed at the protruding end portion of the throttle shaft 2. Furthermore, a small-diameter shaft portion 2b that penetrates the gear cover 8 is formed at the end of the engagement shaft portion 2a.

  The throttle shaft 2 is fixed to the throttle shaft 2 by being fastened to the engagement shaft portion 2a of the throttle shaft 2 by a nut 14 in a state where the substantially disc-like throttle gear 5 is engaged. . The throttle gear 5 is a sector gear as shown in FIG. 2, and has a gear portion 5a on the outer peripheral portion thereof.

  As shown in FIG. 1, a motor housing recess 1c that opens into the housing space 8a is formed at one side of the throttle body 1 (left side in FIG. 1). A control motor 3 made of, for example, a DC motor is mounted in the motor housing recess 1c. On the output shaft of the control motor 3, a drive gear 3a located in the accommodation space 8a is fixed.

  As shown in FIG. 1, a counter shaft 15 is installed between the throttle body 1 and the gear cover 8. The countershaft 15 is disposed at a substantially intermediate portion between the throttle shaft 2 and the control motor 3. The counter gear 4 is rotatably supported on the counter shaft 15. The counter gear 4 has a large-diameter gear portion 4a located on the gear case side and a small-diameter gear portion 4b located on the throttle body side. The large diameter gear portion 4 a is meshed with the drive gear 3 a of the control motor 3. The small-diameter gear portion 4b is engaged with the gear portion 5a of the throttle gear 5.

  Thus, the control motor 3 is driven and controlled by the control circuit 20 as is well known. The control circuit 20 drives the control motor 3 by outputting a drive signal to the control motor 3 when a signal corresponding to the engine operating state such as an accelerator pedal depression amount of an engine (not shown) is input. Control. Then, the driving force of the control motor 3 is transmitted to the throttle shaft 2 through the driving gear 3a, the counter gear 4 and the throttle gear 5, whereby the throttle valve 13 is rotated (so-called opening degree adjustment). .

  As shown in FIG. 1, a substantially disc-shaped relief lever 9 is rotatably supported on the throttle shaft 2. The relief lever 9 is disposed between the boss portion 1 b of the throttle body 1 and the throttle gear 5. Since the relief lever 9 is rotatable with respect to the throttle shaft 2, there is a predetermined gap between the fitting surfaces of the two, and components adjacent to both sides of the relief lever 9, that is, the throttle body 1 and the throttle. There is also a predetermined gap between the facing surfaces of the gear 5 and the relief lever 9. Therefore, the relief lever 9 can tilt with respect to the throttle shaft 2.

  As shown in FIG. 1, in the relief lever 9, a large-diameter annular groove 9a is formed on the end face on the throttle body side, and a small-diameter annular groove 9b is formed on the end face on the throttle gear 5 side.

  As shown in FIG. 1, a back spring 11 made of a coil spring is interposed between the throttle body 1 and the relief lever 9. An end portion (upper end portion in FIG. 1) of the back spring 11 on the throttle body side is fitted to the boss portion 1b, and a terminal portion 11b (see FIG. 2) is hooked on the throttle body 1. Further, as shown in FIG. 1, the end portion (lower end portion in FIG. 1) of the back spring 11 on the relief lever side is fitted in the large-diameter annular groove 9a of the relief lever 9, and its end portion 11a (see FIG. 1). 2 and FIG. 3) are hooked on the relief lever 9. The back spring 11 always biases the relief lever 9 in the valve closing direction (clockwise direction in FIG. 2) with respect to the throttle body 1. As shown in FIG. 2, the terminal portion 11 a of the back spring 11 is latched by a latching recess 9 c formed in the groove wall of the large-diameter annular groove 9 a of the relief lever 9.

  As shown in FIG. 1, a relief spring 10 made of a coil spring is interposed between the throttle gear 5 and the relief lever 9. As shown in FIG. 2, one terminal portion 10 a of the relief spring 10 is hooked on the throttle gear 5, and the other terminal portion 10 b is hooked on the relief lever 9. The relief spring 10 always urges the throttle gear 5 in the valve opening direction (counterclockwise in FIG. 2) with respect to the relief lever 9. As shown in FIG. 1, the relief spring 10 is fitted in the small-diameter annular groove 9 b of the relief lever 9.

  The urging force of the back spring 11 and the relief spring 10 is set to be smaller than the driving torque on the throttle shaft 2 by the control motor 3 and larger than the stopping torque when the control motor 3 is not energized. .

  As shown in FIGS. 2 and 3, between the throttle gear 5 and the relief lever 9, a predetermined rotational position in the valve opening direction of the throttle gear 5 (corresponding to the opening degree of the throttle valve 13). Are provided with first contact means b that can contact each other. The first abutting means b includes a pin 5 b made of a pin protruding from the end face of the throttle gear 5 on the relief lever side, and a protrusion 9 d protruding from the outer peripheral portion of the relief lever 9. The protrusion 9d is formed with the latching recess 9c.

  As shown in FIGS. 2 and 3, a predetermined rotation position in the valve closing direction of the relief lever 9 (corresponding to an opener opening of the throttle valve 13) is provided between the throttle body 1 and the relief lever 9. ) Is provided with second contact means a that can contact each other. The second abutting means a is composed of an opener adjusting screw 12 screwed to the gear housing portion le of the throttle body 1 and a protruding portion 9 d of the relief lever 9. It should be noted that the abutting position of the tip of the relief lever 9 with respect to the protrusion 9d (refer to reference numeral A in FIG. 3) can be adjusted by screwing or screwing the opener adjustment screw 12.

Thus, as shown in FIG. 3, perpendicular to the axis L of the throttle shaft 2, and the restoring force acting position of the relief lever 9 on one plane P (code, subjecting C) is arranged, the first person An abutting portion (reference symbol, B) of the contact means b and an abutting portion (reference symbol, A) of the second abutting means a are arranged.

  As shown in FIG. 5, between the throttle body 1 and the throttle gear 5, a predetermined rotational position in the valve closing direction of the throttle gear 5 (the minimum opening of the throttle valve 13 (see FIG. 1)). The third abutting means d that can abut against each other is provided. The third abutting means d is composed of a minimum opening adjusting screw 18 screwed to a projecting piece 1 f projecting to the gear housing portion le of the throttle body 1 and a projecting portion 5 c projecting to the throttle gear 5. ing. Note that the position of contact of the tip of the throttle gear 5 with the protruding portion 5c (see symbol D in FIG. 5) can be adjusted by screwing or screwing the minimum opening adjustment screw 18 forward.

  As shown in FIG. 1, a sensor housing portion 8b is formed at one end portion of the gear cover 8 (right end portion in FIG. 1). A sensor substrate 7 is attached to the opening end surface of the sensor housing portion 8 b and is closed by a sensor cover 16. The small-diameter shaft portion 2 b of the throttle shaft 2 protrudes through the gear cover 8 into the sensor housing portion 8 b. A sensor lever 6 is fixed to the small diameter shaft portion 2b. The sensor lever 6 and the sensor substrate 7 constitute a throttle sensor for detecting the opening degree of the throttle valve 13 as is well known.

In the throttle control device described above, when the control motor 3 is not energized when the engine is stopped or the like, as shown in FIGS. 2 and 3, the back of the throttle body 1 opener adjusting screw 12 in the second contact means a is backed up. The protrusion 9d of the relief lever 9 comes into contact with the urging of the spring 11. Further, the pin 5b of the throttle gear 5 comes into contact with the protrusion 9d of the relief lever 9 in the first contact means b by the urging of the relief spring 10. The throttle valve 13 in this state is held at the opener opening determined based on the contact portion A (see FIG. 3) of the protrusion 9d of the relief lever 9 set by the opener adjusting screw 12. In this state, the engine is waiting to start, so that the throttle valve 13 or the throttle shaft 2 is frozen in a cold region or the like, or the throttle valve 13 is prevented from being fixed due to adhesion of combustion products, etc. It is possible to prevent engine starting failure.

  When the engine is started from the engine start waiting state, the control motor 3 is driven and controlled by the control circuit 20 (see FIG. 1). By controlling the opening and closing of the throttle valve 13 by driving the control motor 3, the amount of intake air flowing through the intake passage 1a of the throttle body 1 is adjusted.

  Specifically, in an idling state in which the accelerator pedal is not depressed (also referred to as a released state), the control motor 3 causes the throttle valve 13 to be opened at an opening that is equal to or less than the opening of the opener (the idling opening). Closed). That is, as shown in FIG. 5, the throttle gear 9 is in a state in which the protrusion 9d of the relief lever 9 abuts against the opener adjusting screw 12 of the throttle body 1 in the second abutting means a and the relief lever 9 is prevented from rotating. 5 is rotated in the valve closing direction against the urging force of the relief spring 10, and the protrusion 5c of the throttle gear 5 contacts the minimum opening adjusting screw 18 of the throttle body 1 in the third contact means d. By contacting, the rotation of the throttle gear 5 in the closing direction is stopped. The idling opening of the throttle valve 13 in this state is determined by the contact position D of the protrusion 5c of the throttle gear 5 set by the minimum opening adjusting screw 18 of the throttle body 1.

  Subsequently, when the accelerator pedal is depressed, the control motor 3 is driven via the control circuit 20 (see FIG. 1) according to the depression amount, so that the throttle valve 13 is controlled to open and close to a predetermined opening. . Thus, when the throttle valve 13 is controlled to be opened or closed below the opening of the opener, the protrusion 9d of the relief lever 9 comes into contact with the opener adjusting screw 12 of the throttle body 1 in the second contact means a so that the relief lever Only the throttle gear 5 is rotated against the urging force of the relief spring 10 in a state where 9 is prevented from rotating.

  Further, when the throttle valve 13 is controlled to open and close above the opening of the opener, the protrusion of the relief lever 9 in the first abutting means b due to the urging of the back spring 11 and the relief spring 10 as shown in FIG. The pin 5b of the throttle gear 5 is held in contact with the portion 9d, and the relief lever 9 is rotated together with the throttle gear 5.

  By the way, when the driving of the control motor 3 is stopped by stopping the engine or the like during engine operation, the throttle valve 13 has an opener opening and is in a state of waiting for engine start, as shown in FIGS. The More specifically, when the drive of the control motor 3 is stopped when the throttle valve 13 is opened beyond the opening of the opener (see FIG. 4), the throttle gear is moved together with the relief lever 9 by the biasing force of the back spring 11. 5 is rotated in the valve closing direction so that the protrusion 9d of the relief lever 9 is in contact with the opener adjusting screw 12 of the throttle body 1 in the first contact means b, that is, the throttle valve 13 is closed to the opener opening. It is done. Further, when the drive of the control motor 3 is stopped when the throttle valve 13 is closed below the opener opening (see FIG. 5), the throttle gear 5 is moved in the valve opening direction by the urging force of the relief spring 10. The pin 5b of the throttle gear 5 is in contact with the protrusion 9d of the relief lever 9 of the second contact means a, that is, the throttle valve 13 is opened to the opener opening.

Also as shown in FIG. 3, perpendicular to the axis L of the throttle shaft 2, and on one plane P which returning force acting position C is located in the back spring 11 against the relief lever 9, those of the first abutment means b The contact part B and the contact part A of the second contact means a are arranged. For this reason, in any operating state of the state in which the relief lever 9 is rotated together with the throttle shaft 2 by the first contact means b and the state in which the relief lever 9 is prevented from rotating by the second contact means a. In addition, since the relief lever 9 is held in a state in which the tilt is prevented, fluctuations in the tilt due to a change in the operating state of the relief lever 9 can be prevented.

  The operating torque of the throttle valve 13 in this embodiment is represented by a characteristic diagram shown in FIG. In FIG. 6, the horizontal axis indicates the throttle opening, and the vertical axis indicates the operating torque of the throttle valve 13. As can be seen from FIG. 6, in the opener opening θ, there is no opener opening hysteresis (opening range of θ1 and θ2 in FIG. 14) due to the inclination accompanying the change of the operating state of the relief lever. . Therefore, it is possible to prevent variations in the opener opening θ that becomes the reference value of the throttle opening during the opening / closing control of the throttle valve 13.

  As described above, the control accuracy of the throttle valve 13 can be improved by preventing the fluctuation of the inclination accompanying the change of the operating state of the relief lever 9.

  Further, as described above, since the tilt of the relief lever 9 is prevented, the sliding between the relief lever 9 and the components adjacent to the relief lever 9 (the boss 1b of the throttle body 1 and the throttle gear 5). Frictional force generated during movement can be reduced.

[ Related Technology 1 ]
A related technique 1 of the present invention will be described with reference to FIG. Since Related Technology 1 is a partial modification of one embodiment , the changed portion will be described in detail, and redundant description will be omitted. FIG. 7 is a plan view of an essential part of the throttle control device.

This related art, as shown in FIG. 7, perpendicular to the axis L of the throttle shaft 2, and one side of the return force acting position C comprises a plane upper P located in the back spring 11 against the relief lever 9 (Fig. downwards) at 7, in which the contact portion B and the contact portion a of the second abutment means a first abutment means b is arranged.

  If comprised in this way, either the state in which the relief lever 9 is rotated together with the throttle shaft 2 by the first contact means b, or the state in which the relief lever 9 is prevented from rotating by the second contact means a. Even in the operating state, the relief lever 9 is held in a state inclined in the same direction. That is, the relief lever 9 is tilted in the same direction in any operating state, and is tilted to the left-up and right-down state in FIG. 7, so that the inclination of the relief lever 9 according to the change in the operating state of the relief lever 9 Variations can be prevented. Thereby, the control accuracy of the throttle valve 13 can be improved.

[ Related Technology 2 ]
A related technique 2 of the present invention will be described with reference to FIG. Since the related technique 2 is a partial modification of one embodiment , the changed part will be described in detail, and a duplicate description will be omitted. FIG. 8 is a plan view of a main part of the throttle control device.

This related art, as shown in FIG. 8, perpendicular to the axis L of the throttle shaft 2, and one side of the return force acting position C comprises a plane upper P located in the back spring 11 against the relief lever 9 (Fig. above) at 7, in which the contact portion B and the contact portion a of the second abutment means a first abutment means b is arranged.

  If comprised in this way, either the state in which the relief lever 9 is rotated together with the throttle shaft 2 by the first contact means b, or the state in which the relief lever 9 is prevented from rotating by the second contact means a. Even in the operating state, the relief lever 9 is held in a state inclined in the same direction. That is, the relief lever 9 is inclined in the same direction in any operating state, and is inclined to the left-lowering and rising-right state in FIG. Variations can be prevented. Thereby, the control accuracy of the throttle valve 13 can be improved.

  The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, the throttle gear 5 can be replaced with a lever member that does not have the gear portion 5a.

It is a plane sectional view of a throttle control device concerning one example of the present invention. It is a partial front view which shows the state of an opener opening degree. It is the partial top view. It is a partial front view which shows the opening degree state larger than an opener opening degree. It is a partial front view which shows the opening degree state smaller than an opener opening degree. It is a characteristic line figure of an operation torque. It is a principal part top view of the throttle control apparatus concerning the related technique 1 of this invention. It is a principal part top view of the throttle control apparatus concerning the related technology 2 of this invention. It is a partial top view of the throttle control apparatus of a prior art example. It is a partial top view which shows the opening degree state larger than an opener opening degree. FIG. It is a fragmentary top view which shows the opening degree state smaller than an opener opening degree. FIG. It is a characteristic line figure of an operation torque.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Throttle body 1a Intake passage 2 Throttle shaft 3 Control motor 5 Throttle gear 9 Relief lever 10 Relief spring 11 Back spring 13 Throttle valve a 2nd contact means b 1st contact means A 2nd contact means a B contact part B first contact means b contact part C back spring return force acting position L throttle shaft axis

Claims (3)

A throttle body, a throttle shaft, a throttle valve, a control motor, a throttle gear, a relief lever, a back spring, and a relief spring are provided, the throttle body forms an intake passage, and the throttle shaft is rotatable to the throttle body. The throttle valve is provided on the throttle shaft so that the intake passage can be opened and closed by rotation thereof, the control motor is provided so that the throttle valve can be opened and closed, and the throttle gear is fixed to the throttle shaft. The relief lever is pivotally provided on the throttle shaft, the back spring biases the relief lever in a valve closing direction, the relief spring biases the throttle gear in a valve opening direction, throttle Between the throttle body and the relief lever is provided with a first abutting means capable of abutting each other at a predetermined rotational position in the valve opening direction of the throttle gear, and between the throttle body and the relief lever. Is a throttle control device provided with second contact means that can contact each other at a predetermined rotation position in the valve closing direction of the relief lever,
Perpendicular to the axis of the throttle shaft, and a back spring return force action position C is on a plane which is positioned relative to the relief lever abutting portion of the abutting portion B and a second abutment means of the first abutment means A throttle control device, wherein A is arranged. A throttle body, a throttle shaft, a throttle valve, a control motor, a throttle gear, a relief lever, a back spring, and a relief spring are provided, the throttle body forms an intake passage, and the throttle shaft is rotatable to the throttle body. The throttle valve is provided on the throttle shaft so that the intake passage can be opened and closed by rotation thereof, the control motor is provided so that the throttle valve can be opened and closed, and the throttle gear is fixed to the throttle shaft. The relief lever is pivotally provided on the throttle shaft, the back spring biases the relief lever in a valve closing direction, the relief spring biases the throttle gear in a valve opening direction, throttle Between the throttle body and the relief lever is provided with a first abutting means capable of abutting each other at a predetermined rotational position in the valve opening direction of the throttle gear, and between the throttle body and the relief lever. Is a throttle control device provided with second contact means that can contact each other at a predetermined rotation position in the valve closing direction of the relief lever,
And wherein the perpendicular to the axis of the throttle shaft, and a back spring return force action position C is on a plane positioned with respect to the relief lever abutting portion B of the first abutment means is arranged Throttle control device. A throttle body, a throttle shaft, a throttle valve, a control motor, a throttle gear, a relief lever, a back spring, and a relief spring are provided, the throttle body forms an intake passage, and the throttle shaft is rotatable to the throttle body. The throttle valve is provided on the throttle shaft so that the intake passage can be opened and closed by rotation thereof, the control motor is provided so that the throttle valve can be opened and closed, and the throttle gear is fixed to the throttle shaft. The relief lever is pivotally provided on the throttle shaft, the back spring biases the relief lever in a valve closing direction, the relief spring biases the throttle gear in a valve opening direction, throttle Between the throttle body and the relief lever is provided with a first abutting means capable of abutting each other at a predetermined rotational position in the valve opening direction of the throttle gear, and between the throttle body and the relief lever. Is a throttle control device provided with second contact means that can contact each other at a predetermined rotational position in the valve closing direction of the relief lever,
The contact portion A of the second contact means is arranged on a plane perpendicular to the axis of the throttle shaft and on which the return spring acting position C of the back spring with respect to the relief lever is located. Throttle control device.

Images