JP2004301118A - Electronically controlled throttle control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronically controlled throttle control device capable of reducing a rotational load of a driving motor and preventing malfunction of a throttle valve 3 by extensively decreasing sliding resistance between the periphery of a spring inner peripheral guide 53 of a valve gear 9 and the inner periphery of a default spring 62 of a piece of coil spring 6. <P>SOLUTION: An offset amount (rotational deformation amount) of the default spring 62 generated when the other end of the spring 62 is set in a second locking part provided in the opener member 52 of the valve gear 9, and a U-shaped hook part 63 is set in a locking part 55 in the opener member 52 is previously added in the opposite direction when the coil spring 6 is formed, thus reducing the offset amount generated when the spring 6 is set in the control device. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electronically controlled throttle control device that controls the amount of intake air to an internal combustion engine by adjusting the opening degree of a throttle valve by the operation of a drive motor. Electronic control comprising a coil spring having a U-shaped hook portion fixed to the coil spring and winding both ends in different directions, and a power transmission device having a spring inner peripheral guide for holding the coil inner diameter side of the coil spring. The present invention relates to a throttle control device.

[Conventional technology]
Conventionally, when supply of current to a drive motor is interrupted for some reason, the throttle valve is mechanically moved between a fully closed position and a fully opened position by utilizing different biasing forces of a plurality of springs. An electronically controlled throttle control device having an opener-side function that allows the vehicle to evacuate without holding the internal combustion engine immediately without being stopped by holding it at an intermediate position (for example, see Patent Document 1) 1).

  However, the conventional electronically controlled throttle control device has an opener side function of holding the throttle valve at an intermediate position when supply of current to the drive motor is interrupted for some reason. In addition, two lever members including an intermediate stopper member, and two spring members including a spring for an opener-side function and a spring for a return-side function are required, resulting in a problem that the number of parts is large and the cost is high. . In addition, since the intermediate stopper member abutting on the locking portion on the throttle body side adopts a complicated configuration in which an intermediate position in the throttle valve is set via a contact portion with the opener member, component tolerances and the like are reduced. There has been a problem that the opening position of the throttle valve at the intermediate position changes due to the variation.

  Therefore, in order to solve the above-mentioned problem, in the opener mechanism of the electronically-controlled throttle control device, the number of parts is reduced to simplify the configuration, and the opening position of the throttle valve at the intermediate position (also referred to as a default position). For the purpose of improving accuracy, as shown in FIGS. 10 to 13, a first spring portion 101 having a return-side function (hereinafter, referred to as a return spring function) and an opener-side function (hereinafter, referred to as an opener spring function). The joint portion with the second spring portion 102 is bent into a substantially inverted U-shape to form a U-shaped hook portion 103 fixed at an intermediate position fixed to the throttle body 114, and both ends (one end of the first spring portion 101) Coil-like spring (coil spring) in which the second part and the other end of the second spring part 102 are wound in different directions. Ring 100) structure has been proposed (e.g., see Patent Document 2). In addition, 121 is a body side hook, 122 is a gear side hook, 123 is a lateral displacement prevention guide, 124 is an engaging portion provided on the opener member 106, and 125 is a body side spring inner circumference guide.

[Faults of conventional technology]
However, when the throttle valve 104 and the throttle shaft 105 are closed from the intermediate position to the fully closed position in the electronic control type throttle control device described in Patent Document 2, the U-shaped hook portion of one coil spring 100 is used. 103 is locked by an intermediate stopper member 115, and a power transmission device (for example, a gear reduction device including a valve gear 111, an intermediate reduction gear 112, and a pinion gear 113) for transmitting the rotational power of the drive motor 110 to the throttle valve 104 and the throttle shaft 105. The opener member 106 integrally formed on the opposing surface of the valve gear 111 forming one component rotates together with the spring gear side hook 107 which is the other end of the second spring portion 102 to move from the fully closed position to the intermediate position. When generating biasing force in the direction to return to Second spring inner periphery guide 108 which holds the inner diameter side of the spring portion 102 of the coil spring 100, relative motion increases the inner peripheral surface of the second spring portion 102.

Therefore, from the above, when closing the throttle valve 104 and the throttle shaft 105 from the default position to the fully closed position side, the outer peripheral surface of the spring inner peripheral guide 108 integrally formed with the opener member 106 on the opposing surface of the valve gear 111. With the occurrence of a large sliding resistance in the relative movement between the surface and the inner peripheral surface of the second spring portion 102 of one coil spring 100, the malfunction of the throttle valve 104 and the throttle shaft 105 and the operation of the drive motor 110 There is a new problem that the rotation load may be increased.
U.S. Pat. No. 5,492,097 (pages 1-9, FIGS. 1-9) JP-A-2002-256894 (pages 1 to 10, FIGS. 1 to 7)

  SUMMARY OF THE INVENTION It is an object of the present invention to significantly reduce the sliding resistance between a rotating body of a power transmission device and one coil spring, thereby reducing the rotational load of an actuator such as a drive motor and a throttle. An object of the present invention is to provide an electronically controlled throttle control device capable of preventing a malfunction of a valve.

  According to the first aspect of the present invention, the coil shape of one coil spring whose one end is locked to the throttle body and the other end is locked to the rotating body of the power transmission device, The other end of the coil spring is formed in a coil shape in which the center axis of the coil spring is decentered on the side opposite to the direction in which the coil spring is deformed when assembled, so that one end of the coil spring is assembled to the throttle body, and When the other end is assembled to the rotating body, a cylindrical gap can be formed between the rotating body and the coil spring.

  Accordingly, even when the throttle valve is driven to rotate by the actuator and the rotating body and the coil spring move relative to each other, the rotating body and the coil spring hardly come into sliding contact with each other. Sliding resistance can be significantly reduced compared to conventional products. Therefore, malfunction of the throttle valve can be prevented, and the rotational load of the actuator such as the drive motor can be reduced, so that the size of the actuator such as the drive motor can be reduced. Further, wear of the sliding portion between the rotating body and the coil spring can be prevented, so that deterioration of sliding resistance over time can be prevented.

  According to the invention described in claim 2, the coil spring is mounted between the outer wall surface of the throttle body and the opposing surface of the rotating body. As the above-mentioned coil spring, the coil outer diameter is substantially the same in the central axis direction, and the pitch of the coil is the same pitch coil, or the coil outer diameter is substantially the same in the central axis direction, and the coil interval is changed. A non-uniform pitch coil or a non-linear spring whose coil outer diameter changes in the direction of the central axis may be used.

  According to the third aspect of the present invention, a rotating body (for example, a throttle shaft or a valve gear) constituting one component of a power transmission device for transmitting the rotational power of the actuator to the throttle valve is opposed to, for example, an outer wall surface of a throttle body. While holding the coil inner diameter side of the coil spring on the opposite surface, it rotates integrally with the spring inner circumference guide that operates relative to the coil spring, and the throttle valve, and urges the coil spring in the fully open or fully closed direction The opener member is integrally formed. In this case, even if the throttle valve is driven to rotate by the actuator and the outer peripheral surface of the spring inner peripheral guide of the rotating body and the inner peripheral surface of the coil spring move relative to each other, the outer peripheral surface of the spring inner peripheral guide and the coil spring are moved. Since the sliding contact between the inner circumferential surface and the inner circumferential surface is difficult, the sliding resistance in the relative movement between the outer circumferential surface of the spring inner circumferential guide and the inner circumferential surface of the coil spring can be significantly reduced as compared with the conventional product.

  According to the fourth aspect of the present invention, since the first spring portion of the coil spring has a return spring function, when the throttle valve operates in the operation range of the intermediate position or more and the full open position or less. Then, the throttle valve can be returned from the fully open position side to the intermediate position via the opener member. Further, since the second spring portion of the coil spring has an opener spring function (default spring function), when the throttle valve is operated in the operating range below the intermediate position and above the fully closed position, the opener spring function is used. The throttle valve can be returned from the fully closed position side to the intermediate position via the member.

  According to the fifth aspect of the present invention, as a coil spring, a connecting portion between the first spring portion and the second spring portion is bent into a substantially inverted U shape to form a U-shaped hook portion, and a shaft of the first spring portion. One coil-shaped spring structure is employed in which one end in the direction and the other end in the axial direction of the second spring portion are wound in different directions. As a result, the number of parts can be reduced, and the effect of reducing costs can be obtained.

  According to the invention described in claim 6, when power to the actuator (for example, a drive motor) is cut off for some reason by the throttle body, the U-shaped hook portion is locked and the throttle valve is moved to the intermediate position. An intermediate stopper member for holding and a first locking portion for locking one end of the first spring portion are provided. Further, the opener member is provided with an engaging portion which is detachably engaged with the U-shaped hook portion, and a second locking portion which locks the other end of the second spring portion. As a result, the throttle valve is reliably held at a predetermined position (intermediate position) between the fully closed position and the fully opened position. Therefore, even if the power supply to the actuator is cut off for some reason, the internal combustion engine is stopped. The minimum required intake air can be sent to the internal combustion engine, so that the vehicle can be evacuated without immediately stopping the internal combustion engine.

  Here, in this case, at the time of assembling one coil spring, that is, the U-shaped hook portion, which is the connecting portion between the first spring portion and the second spring portion, is connected to a rotating body (for example, a throttle shaft or a valve gear). An offset amount of the second spring portion (which is generated when the second spring portion is set on the engagement portion provided on the opener member and the other end of the second spring portion is set on the second locking portion provided on the opener member) The amount of rotational deformation) is given in the opposite direction in advance when molding one coil spring, so that the second spring portion when one coil spring is assembled to the electronic control type throttle control device. Can be reduced.

  According to the invention described in claim 7, one end of the first spring portion of one coil spring is assembled to (the first locking portion of) the throttle body, and the second spring portion of one coil spring is When the other end is assembled to (the second locking portion of) the valve gear, the outer peripheral surface of the spring inner peripheral guide of the valve gear and the inner peripheral surface (inner diameter side) of the second spring portion of the coil spring become substantially concentric. A cylindrical gap can be formed between the spring inner circumference guide of the valve gear and the second spring portion of the coil spring. Accordingly, even when the throttle valve and the throttle shaft are driven to rotate by the actuator and the outer peripheral surface of the spring inner peripheral guide of the valve gear and the inner peripheral surface of the second spring portion of the coil spring move relative to each other, the spring inner peripheral guide of the valve gear is moved. The outer peripheral surface of the coil spring and the inner peripheral surface of the second spring portion of the coil spring are less likely to slide, so that the relative movement between the outer peripheral surface of the spring inner peripheral guide of the valve gear and the inner peripheral surface of the second spring portion of the coil spring. , The sliding resistance can be significantly reduced as compared with conventional products.

  The above-mentioned second locking portion for locking the other end of the second spring portion of the coil spring to the opener member which rotates integrally with the throttle valve and the throttle shaft, the first spring portion and the second spring portion are provided. And a plurality of lateral displacement prevention guides (shafts) for restricting the further movement of the U-shaped hook portion of the coil spring in the axial direction. (Direction regulating means) may be provided integrally.

  According to the invention described in claim 8, the rotating body has an engaging portion that engages with the U-shaped hook portion in a detachable manner, and a circumferential direction of the engaging portion (for example, on the same circumference as the engaging portion). ) Is provided with a locking portion for locking the other end of the coil spring, whereby the U-shaped hook portion of the coil spring is assembled to the engaging portion of the rotating body, and the other end of the coil spring is engaged with the rotating body. When assembled to the stop, the rotation of the coil spring can be prevented, and a cylindrical gap can be formed between the coil inner peripheral guide and the coil spring provided integrally with the rotating body. Thereby, the sliding resistance in the relative movement between the outer peripheral surface of the spring inner peripheral guide of the rotating body and the inner peripheral surface of the coil spring can be further reduced.

  According to the ninth aspect of the present invention, the engaging portion that engages with the U-shaped hook portion in a detachable manner with the rotating body, and the circumferential direction of the engaging portion (for example, on the substantially same circumference as the engaging portion) ) Is provided with a locking portion for locking the other end of the coil spring, whereby the U-shaped hook portion of the coil spring is assembled to the engaging portion of the rotating body, and the other end of the coil spring is engaged with the rotating body. When assembled to the stop, the rotation of the coil spring can be prevented, and a cylindrical gap can be formed between the rotating body and the coil spring. Here, when the rotating body is formed integrally with the inner peripheral side of the coil spring of the coil spring and operating relative to the coil spring, the spring is provided integrally with the rotating body. A cylindrical gap can be formed between the inner peripheral guide and the coil spring.

  Accordingly, even when the throttle valve is driven to rotate by the actuator and the rotating body and the coil spring move relative to each other, the rotating body and the coil spring hardly come into sliding contact with each other. Sliding resistance can be significantly reduced compared to conventional products. Therefore, malfunction of the throttle valve can be prevented, and the rotational load of the actuator such as the drive motor can be reduced, so that the size of the actuator such as the drive motor can be reduced. Further, wear of the sliding portion between the rotating body and the coil spring can be prevented, so that deterioration of sliding resistance over time can be prevented.

  The best mode for carrying out the present invention is to reduce the rotational load of an actuator such as a drive motor and to prevent a malfunction of a throttle valve by using a rotating body of a power transmission device and one coil spring. This was realized by greatly reducing the sliding resistance between the two.

[Configuration of First Embodiment]
1 to 6 show a first embodiment of the present invention. FIG. 1 is a diagram showing a main structure of an electronically controlled throttle control device, and FIG. 2 is a diagram showing an entire structure of an electronically controlled throttle control device. FIG. 3 is a diagram showing components such as a drive motor and a gear reduction device formed inside a gear case integrally formed on the outer wall surface of the throttle body, and FIG. 4 is an electronically controlled throttle. FIG. 3 is a diagram illustrating a schematic structure of a control device.

  The electronically controlled throttle control device of the present embodiment is housed in a throttle body 1 forming an intake passage to each cylinder of an internal combustion engine (engine), and openable and closable in a cylindrical bore wall 2 of the throttle body 1. A throttle valve 3 for adjusting the amount of air taken into the engine; a throttle shaft 4 holding the throttle valve 3 and rotatably supported by a bearing support of the bore wall 2; A drive motor (actuator, valve driving means) 5 for rotating and driving the shaft 4 in the fully open direction or the fully closed direction, and a gear reduction device (power transmission device) for transmitting the rotation output of the drive motor 5 to the throttle valve 3 and the throttle shaft 4. And an engine control device (engine) that electronically controls the drive motor 5 based on the accelerator operation amount. Emission control unit: a hereinafter referred to as ECU) and the internal combustion engine intake control device provided with a.

  Further, as shown in FIGS. 1 to 4, the electronically controlled throttle control device of the present embodiment has a first spring portion (hereinafter referred to as a return spring) 61 having a return spring function and a second spring portion having an opener spring function. A single coil spring (valve biasing means) 6 for biasing the throttle valve 3 in a fully closed direction or a fully opened direction by integrating a spring portion (hereinafter referred to as a default spring) 62 is provided. The one coil spring 6 is mounted between the outer wall surface (the right end surface in the figure) of the bore wall portion 2 of the throttle body 1, that is, the cylindrical concave bottom wall surface of the gear case 7 and the left end surface in the figure of the valve gear 9. A connecting portion (middle) between the return spring 61 and the default spring 62 is bent into a substantially inverted U-shape to form a U-shaped hook portion 63 held by the intermediate stopper member 25, and both ends are wound in different directions. It has a coiled spring structure.

  The electronically controlled throttle control device controls the rotation speed of the engine by controlling the amount of intake air flowing into the engine based on the degree of depression (accelerator operation amount) of an accelerator pedal (not shown) of the vehicle. It is. The ECU is connected to an accelerator opening sensor (not shown) which converts the degree of depression of the accelerator pedal into an electric signal (accelerator opening signal) and outputs to the ECU how much the accelerator pedal is depressed. ing.

  The electronically controlled throttle control device includes a throttle position sensor that converts the opening of the throttle valve 3 into an electric signal (throttle opening signal) and outputs to the ECU how much the throttle valve 3 is open. . The throttle position sensor includes a rotor 10 fixed to the right end of the throttle shaft 4 in the figure by caulking or the like, a divided (substantially square) permanent magnet 11 serving as a magnetic field source, and a permanent magnet 11. A split type (substantially arc-shaped) yoke (magnetic material) 12 to be magnetized, a Hall element 13 integrally arranged on the gear cover 8 side to face the split type permanent magnet 11, A terminal (not shown) made of a conductive thin metal plate for electrically connecting to an external ECU, and a stator 14 made of an iron-based metal material (magnetic material) that concentrates magnetic flux on the Hall element 13. It is configured.

  The split type permanent magnet 11 and the split type yoke 12 are fixed to the inner peripheral surface of a rotor 10 insert-molded in a valve gear 9 which is one of the components of the gear reduction device, using an adhesive or the like. The split type permanent magnet 11 is disposed between two adjacent yokes 12. In the split type permanent magnet 11 of the present embodiment, a substantially rectangular permanent magnet whose magnetization direction is the vertical direction in FIG. 3 (the upper pole in the drawing is the north pole and the lower pole in the drawing is the south pole) is such that the same poles are on the same side. It is arranged to become. The Hall element 13 is equivalent to a non-contact type detection element, and is arranged to face the inner peripheral side of the permanent magnet 11. When a magnetic field of N pole or S pole is generated on the sensitive surface, the Hall element 13 responds to the magnetic field. This generates an electromotive force (a positive potential is generated when a magnetic field of the N pole is generated, and a negative potential is generated when a magnetic field of the S pole is generated).

  The throttle body 1 is made of a metal material, for example, aluminum die cast, and rotates a throttle valve 3 in a rotation direction from a fully closed position to a fully open position in an intake passage having a substantially circular cross section formed in a bore wall portion 2. It is a device that holds freely, and is fastened and fixed to the intake manifold of the engine using fasteners (not shown) such as fixing bolts and fastening screws. The throttle body 1 includes a cylindrical bearing support portion 16 that rotatably supports a right end (one end) of the throttle shaft 4 in the figure via a ball bearing (bearing) 15 and a left end (shown in the figure) of the throttle shaft 4. A cylindrical bearing support portion 18 rotatably supporting the other end portion via a dry bearing (bearing) 17 and an actuator case accommodating the drive motor 5 and the gear reduction device.

  Here, the actuator case of this embodiment includes a gear case (gear housing, case body) 7 integrally formed on the outer wall surface of the bore wall 2 of the throttle body 1, and closes an opening side of the gear case 7. And a gear cover (sensor cover, cover) 8 for holding a throttle position sensor. The gear cover 8 is made of a thermoplastic resin that electrically insulates the terminals of the above-described throttle position sensor. The gear cover 8 has a fitting portion fitted to a fitting portion provided on the opening side of the gear case 7, and is assembled to the opening side end of the gear case 7 by rivets and screws (not shown). I have.

  As shown in FIGS. 2 and 3, one of the two bearing support portions 16, 18 is provided on the outer wall surface of the bore wall portion 2 of the throttle body 1, that is, the cylindrical concave portion of the gear case 7. It is integrally formed so as to protrude rightward in the drawing from the bottom wall of the shape, and holds the inner diameter side of the return spring 61 of the coil spring 6. Further, a plurality of insertion holes 19 through which fasteners such as fixing bolts and fastening screws are inserted are formed in the outer peripheral portion of the bore wall portion 2.

  A motor housing portion (motor case portion) that is greatly recessed as compared with the gear housing portion (gear case portion) on the upper side in the figure is provided on the lower side of the gear case 7 in the figure. A boss-shaped fully-closed position stopper 21 protruding inward is provided at the center of the upper side of the gear case 7 of the throttle body 1 in the figure. When the throttle valve 3 is closed to the fully closed position, the fully closed position stopper 21 has a fully closed stopper member having an engagement portion with which a fully closed stopper portion 22 formed integrally with the valve gear 9 abuts (adjustment). An adjusting screw 23 having a screw function is screwed.

  A boss-shaped intermediate position stopper (also referred to as a body hook or a default stopper) 24 protruding inwardly is provided on the left side of the gear case 7 of the throttle body 1 in the figure. The intermediate position stopper 24 utilizes the biasing forces of the return spring 61 and the default spring 62 of the coil spring 6 in different directions when the supply of current to the drive motor 5 is interrupted for some reason. An intermediate stopper member (adjust screw having an adjusting screw function) 25 having a locking portion for mechanically holding or locking the throttle valve 3 at a predetermined intermediate position (intermediate stopper position) between the fully closed position and the fully opened position. Is screwed in.

  Here, a boss-shaped fully open position stopper 29 protruding inward is provided on the inner peripheral portion of the gear case 7 opposite to the intermediate position stopper 24. The fully open position stopper 29 is configured such that when the throttle valve 3 is opened to the fully open position, a fully open stopper portion (not shown) integrally formed with the valve gear 9 abuts. A first locking portion (body side hook) for locking one end of the return spring 61 of the coil spring 6 to the outer wall surface of the bore wall portion 2 of the throttle body 1, that is, the cylindrical concave bottom wall surface of the gear case 7. 27 are integrally formed.

  The throttle valve 3 is a butterfly-shaped rotary valve which is formed of a metal material or a resin material into a substantially disk shape and controls the amount of air taken into the engine, and is a valve formed on a valve holding portion of the throttle shaft 4. While being inserted into an insertion hole (not shown), it is fastened and fixed to the throttle shaft 4 using a fastener 28 such as a fastening screw. Thereby, the throttle valve 3 and the throttle shaft 4 are integrated and can be integrally rotated.

  The throttle shaft 4 is formed in a round bar shape from a metal material, and both ends thereof are rotatably or slidably supported by bearing support portions 16 and 18. At the right end of the throttle shaft 4 in the figure, a rotor 10 which is one of the components of the throttle position sensor, which is insert-molded on the inner peripheral portion of the valve gear 9 which is one of the components of the gear reduction device, is swaged. Fixed.

  The drive motor 5 is integrally connected to a motor energizing terminal embedded in the gear case 7 and the gear cover 8, and when energized, an electric actuator (drive) that rotates the motor shaft 36 in a forward direction or a reverse direction. Source). The drive motor 5 includes a field including a yoke 31 or the like made of an iron-based metal material (magnetic material) holding a plurality of permanent magnets 30 on an inner peripheral surface thereof, and fixing means such as caulking on the right end of the yoke 31 in the drawing. The bearing case 32 is fixed to the armature, an armature rotatably supported in the yoke 31 and the bearing case 32, and a brush 33 for supplying a current to the armature.

  The armature is rotatably supported at its left end in the bearing holding portion of the yoke 31 via a thrust bearing 34, and rotatably supported at its right end in the bearing holding portion of the bearing case 32 via a ball bearing 35. A rotor (fixed) comprising a motor shaft 36, an armature core 38 fixed to the outer periphery of the motor shaft 36 and having an armature coil 37 wound around the outer periphery thereof, a commutator 39 electrically connected to the armature coil 37, and the like. Child). The brush 33 is slidably held in a brush holder fixed to the bearing case 32, and is pressed by a coil spring (not shown) so as to always contact the outer peripheral surface of a commutator 39 described later.

  The reduction gear device reduces the rotation speed of the drive motor 5 so as to have a predetermined reduction ratio, and the pinion gear 41 fixed to the outer periphery of the motor shaft 36 of the drive motor 5 meshes with the pinion gear 41 to rotate. A valve drive unit that has an intermediate reduction gear 42 and a valve gear 9 that rotates while meshing with the intermediate reduction gear 42, and that rotates the throttle valve 3 and its throttle shaft 4. The pinion gear 41 is a motor gear integrally formed of a metal material into a predetermined shape and rotated integrally with the motor shaft 36 of the drive motor 5.

  The intermediate reduction gear 42 is integrally formed of a resin material into a predetermined shape, and is rotatably fitted to an outer periphery of a support shaft 44 forming a rotation center. The intermediate reduction gear 42 is provided with a large-diameter gear 45 that meshes with the pinion gear 41 and a small-diameter gear 46 that meshes with the valve gear 9. Here, the pinion gear 41 and the intermediate reduction gear 42 are torque transmitting means for transmitting the torque of the drive motor 5 to the valve gear 9. One end (right end in the figure) of the support shaft 44 in the axial direction is fitted into a concave portion formed on the inner wall surface of the gear cover 8, and the other end (left end in the figure) is fitted into a bore wall of the throttle body 1. 2 is press-fitted and fixed to a concave portion formed on the outer wall surface.

  As shown in FIGS. 1 to 4, the valve gear 9 of the present embodiment is integrally formed in a predetermined substantially annular shape with a resin material, and a small-diameter gear 46 of the intermediate reduction gear 42 is provided on an outer peripheral surface of the valve gear 9. The gear portion 51 that meshes with the gear is integrally formed. A fully-closed stopper portion 22 is integrally formed on the outer peripheral portion of the valve gear 9 as a locked portion that is locked by the fully-closed stopper member 23 when the throttle valve 3 is fully closed. Further, a full-open stopper portion is formed integrally with the outer peripheral portion of the valve gear 9 as a locked portion that is locked by the full-open position stopper 29 when the throttle valve 3 is opened to the full-open position.

  Further, from the side of the bore wall of the valve gear 9 (the left end face in the figure), it rotates integrally with the throttle valve 3 and the throttle shaft 4 and the default spring 62 of the coil spring 6 moves from the fully closed position to the intermediate position side (fully opened direction). ), And a cylindrical spring inner peripheral guide 53 for holding the inner diameter side of the default spring 62 of the coil spring 6 are integrally formed so as to protrude leftward in the axial direction in the figure. I have. The rotor 10 made of an iron-based metal material (magnetic material) is insert-molded on the inner diameter side of the spring inner peripheral guide 53.

  The opener member 52 has a second locking portion 54 that locks the other end of the default spring 62 of the coil spring 6, and is detachably engageable with a U-shaped hook portion 63 that is a connecting portion between the return spring 61 and the default spring 62. A plurality of lateral displacement prevention guides for restricting further movement of the U-shaped hook portion 63 of the coil spring 6 in the axial direction (horizontal direction in the drawing) in the vicinity of the engaging portion 55. 56 are integrally formed.

  The spring inner peripheral guide 53 is substantially coaxial with the bearing support 16 that holds the inner diameter side of the return spring 61 of the coil spring 6 and has substantially the same outer diameter, and is opposed to the bearing support 16. And holds the inner diameter side of the coil spring 6 from the return spring 61 near the U-shaped hook portion 63 of the coil spring 6 to the vicinity of the other end of the default spring 62.

  Here, one coil spring 6 of this embodiment is mounted between the outer wall surface of the bore wall 2 of the throttle body 1 and the opposing surface of the valve gear 9 as shown in FIGS. This is a single coil-shaped spring in which the return spring 61 and the default spring 62 are integrated, and one end of the return spring 61 and the other end of the default spring 62 are wound in different directions. The coupling portion between the return spring 61 and the default spring 62 is provided with a U-shaped hook portion 63 that is held by the intermediate stopper member 25 when power supply to the drive motor 5 is cut off for some reason. ing.

  The return spring 61 is formed by forming a round bar of spring steel into a coil shape, and has a return spring function of urging the throttle valve 3 through the opener member 52 in a direction of returning the throttle valve 3 from a fully open position to an intermediate position (also referred to as a default position). It is a first spring having. The default spring 62 is formed by coiling a round bar of spring steel into a coil shape, and has a second opener spring function for urging the throttle valve 3 via the opener member 52 in a direction to return the throttle valve 3 from the fully closed position to the intermediate position. It is a spring.

  One end of the return spring 61 has a spring body side hook (first cover) which is locked or held by a first locking portion 27 integrally formed on the outer wall surface of the bore wall portion 2 of the throttle body 1. Locking portion) 64 is provided. The other end of the default spring 62 is provided with a spring gear side hook (second locked portion) 65 locked or held by the second locking portion 54 of the opener member 52.

  Here, as shown in FIGS. 1, 5 and 6, one coil spring 6 of the present embodiment has one end of the return spring 61 connected to the first locking portion of the bore wall 2 of the throttle body 1. 27, and the center axis of the default spring 62 is previously eccentric (offset) to the side opposite to the direction in which the other end of the default spring 62 is rotationally deformed when assembled to the second locking portion 54 of the opener member 52 of the valve gear 9. )).

  The default spring 62 has a winding number that is opposite to the winding direction (coil direction) of the return spring 61 and that is smaller than the winding number of the return spring 61 (height of the return spring 61 in the central axis direction). (Height in the central axis direction of the default spring 62) is wound in a coil shape, and together with the return spring 61, constitutes a substantially equal pitch coil in which the coil outer diameter is substantially the same in the central axis direction and the coil interval is substantially equal. are doing. Further, the wire diameter of the default spring 62 is substantially equal to the wire diameter of the return spring 61, and the coil outer diameter of the default spring 62 is substantially equal to the coil outer diameter of the return spring 61.

[Operation of First Embodiment]
Next, the operation of the electronically controlled throttle control device according to the present embodiment will be briefly described with reference to FIGS.

  The operation when the throttle valve 3 is opened from the intermediate position when the electronically controlled throttle control device is normal will be described. When a driver depresses an accelerator pedal, an accelerator opening signal is input to the ECU from an accelerator opening sensor. Then, the drive motor 5 is energized by the ECU so that the throttle valve 3 has a predetermined opening degree, and the motor shaft 36 of the drive motor 5 rotates. Then, the torque of the drive motor 5 is transmitted to the pinion gear 41 and the intermediate reduction gear 42.

  At this time, the engaging portion 55 of the opener member 52 is opposed to the urging force of the return spring 61 having the return spring function, and the engaging portion 55 of the opener member 52 is connected to the U-shaped hook provided at the connecting portion between the return spring 61 and the default spring 62. The part 63 is pressed. At this time, as the valve gear 9 rotates in the opening direction, the spring body side hook 64 is locked or held by the first locking portion 27 integrally formed on the outer wall surface of the bore wall portion 2 of the throttle body 1. The return spring 61 generates an urging force for urging the throttle valve 3 through the opener member 52 in a direction of returning the throttle valve 3 from the fully open position to the intermediate position.

  As a result, the valve gear 9 rotates, so that the throttle shaft 4 rotates by a predetermined rotation angle, and the throttle valve 3 is rotationally driven in a direction (opening direction) in which the throttle valve 3 opens from the intermediate position toward the fully open position. The biasing force of the default spring 62 is not involved in the rotation of the throttle valve 3 in the opening direction, and the opener member 52 is sandwiched between the coupling-side end of the default spring 62 and the spring gear-side hook 65. To maintain.

  Conversely, the operation when the throttle valve 3 is closed from the intermediate position when the electronically controlled throttle control device is normal will be described. When the driver returns the accelerator pedal, the motor shaft 36 of the drive motor 5 rotates in the reverse direction, and the throttle valve 3, the throttle shaft 4 and the valve gear 9 also rotate in the reverse direction. At this time, the second locking portion 54 of the opener member 52 presses the spring gear side hook 65 of the default spring 62 against the urging force of the default spring 62. At this time, as the valve gear 9 rotates in the closing direction, the spring gear side hook 65 is connected to the default spring 62 locked or held by the second locking portion 54 of the opener member 52 via the opener member 52 via the throttle valve. An urging force is generated that urges No. 3 from the fully closed position to the intermediate position.

  As a result, the throttle shaft 4 rotates by a predetermined rotation angle, and the throttle valve 3 is rotationally driven in a direction to close from the intermediate position to the fully closed position side (that is, a closing direction opposite to the opening direction of the throttle valve 3). . The fully closed stopper portion 22 integrally formed on the outer peripheral portion of the valve gear 9 abuts on the fully closed stopper member 23, so that the throttle valve 3 is held at the fully closed position. The urging force of the return spring 61 does not affect the rotation of the throttle valve 3 in the closing direction. The directions of the currents flowing through the drive motor 5 are opposite to each other with the middle position as a boundary.

  On the other hand, the operation of the electronically controlled throttle control device when the current supply to the drive motor 5 is interrupted for some reason will be described. At this time, in a state where the opener member 52 is sandwiched between the coupling portion side end portion of the default spring 62 and the spring gear side hook 65, the return spring function of the return spring 61, that is, the throttle valve 3 is fully opened via the opener member 52. The biasing force that urges the throttle valve 3 from the position to the intermediate position and the opener spring function of the default spring 62, that is, the biasing force that urges the throttle valve 3 to return from the fully closed position to the intermediate position via the opener member 52 are provided. The engagement portion 55 of the opener member 52 comes into contact with the U-shaped hook portion 63 of the coil spring 6. As a result, the throttle valve 3 is reliably held at the intermediate position, so that limp-home traveling can be performed when the supply of current to the drive motor 5 is interrupted for some reason.

[Features of Embodiment 1]
In the electronic control type throttle control device of this embodiment, the return spring 61 is used for the purpose of reducing the number of parts of the opener mechanism to simplify the configuration and improving the accuracy of the opening position of the throttle valve 3 at the intermediate position. The connection between the spring and the default spring 62 is bent into a substantially inverted U-shape to form a U-shaped hook 63 fixed to the intermediate position stopper 24 (intermediate stopper member 25) fixed to the throttle body 1, and different ends. One coil-shaped spring structure wound in the direction is adopted.

  Here, when opening the throttle valve 3 from the intermediate position, the spring body side hook 64 on the bore wall portion 2 side of the throttle body 1 is locked or held by the first locking portion 27 of the bore wall portion 2 of the throttle body 1. The return spring 61 rotates the U-shaped hook portion 63 of the coil spring 6 together with the spring gear side hook 65 and urges the throttle valve 3 via the opener member 52 in the direction of returning the throttle valve 3 from the fully open position to the intermediate position. The bearing support portion 16, which is formed integrally with the bore wall portion 2 of the throttle body 1 and holds down the inner diameter of the return spring 61 of the coil spring 6, is formed on the inner peripheral surface of the return spring 61 of the coil spring 6. On the other hand, there is no relative movement. At this time, the U-shaped hook portion 63 of the coil spring 6, the engaging portion 55 of the opener member 52 formed integrally with the valve gear 9, and the plurality of lateral displacement prevention guides 56 operate integrally, so that the U-shaped hook There is no relative movement between the part 63 and the opener member 52.

  When the throttle valve 3 is closed from the intermediate position, the U-shaped hook portion 63 of the coil spring 6 is fixed to the engaging portion of the intermediate stopper member (body hook) 25 fixed to the throttle body 1, and the opener member 52 is closed. When the default spring 62 generates an urging force that rotates together with the spring gear side hook 65 and urges the throttle valve 3 via the opener member 52 from the fully closed position to the intermediate position, the default of the coil spring 6 The spring inner peripheral guide 53 that holds the inner diameter side of the spring 62 makes a large relative movement with respect to the inner peripheral surface of the default spring 62 of the coil spring 6.

  Here, in the case of an electronically controlled throttle control device (conventional product) having one coil spring 100 as shown in FIGS. 10 to 13, the position is shifted from the intermediate position (default position) to the fully closed position. When the throttle valve 104 is driven, a large relative distance exists between the inner peripheral surface (inner diameter side) of the second spring portion (default spring) 102 of one coil spring 100 and the outer peripheral surface of the spring inner peripheral guide 108 of the valve gear 111. Movement occurs, and a large sliding resistance is generated between the outer peripheral surface of the spring inner peripheral guide 108 and the inner peripheral surface of the second spring portion 102, and the malfunction of the throttle valve 104 due to the occurrence of the sliding resistance in the relative movement. Is concerned.

  This means that the other end of the second spring portion 102 of one coil spring 100 is set on the gear side hook 122 provided on the opener member 106 of the valve gear 111, and the U-shaped hook portion 103 is set on the opener member 106 of the valve gear 111. When the coil spring 100 is set on the engaging portion 124 provided, the second spring portion 102 is particularly rotationally deformed. Therefore, as shown in FIGS. When the throttle valve 104 is driven from the intermediate position (default position) to the fully closed position side when the inner peripheral surface of the second spring portion 102 comes into contact with the inner peripheral surface of the second spring portion 102, This is a factor in the occurrence of sliding resistance in the relative movement between the outer peripheral surface and the peripheral surface.

  Further, abrasion powder (metal powder or resin powder) is generated due to sliding friction between the outer peripheral surface of the spring inner peripheral guide 108 and the inner peripheral surface of the second spring portion 102, and this abrasion powder is generated by the spring inner peripheral guide 108. When interposed in a sliding portion between the outer peripheral surface and the inner peripheral surface of the second spring portion 102, the sliding portion is formed by sliding friction between the outer peripheral surface of the spring inner peripheral guide 108 and the inner peripheral surface of the second spring portion 102. The wear powder is rubbed on the inner peripheral surface of the spring inner peripheral guide 108 or the second spring portion 102, and the relative movement between the outer peripheral surface of the spring inner peripheral guide 108 and the inner peripheral surface of the second spring portion 102 is distorted. The sliding resistance, that is, the sliding resistance caused by the presence of wear powder between the outer peripheral surface of the spring inner peripheral guide 108 and the inner peripheral surface of the second spring portion 102 is further increased. Put away, further problem that promote arises a malfunction of the throttle valve 104.

  Therefore, in the electronic control type throttle control device of the present embodiment, the other end of the default spring 62 is set to the second locking portion (gear side hook) 54 of the opener member 52 of the valve gear 9, and the U-shaped hook portion A single coil spring 6 having a coil shape in which the center axis of the default spring 62 is eccentric in advance is adopted on the side opposite to the direction of rotational deformation when the 63 is set in the engaging portion 55 of the opener member 52. .

  That is, the other end of the default spring 62 is set to the second locking portion (gear-side hook) 54 of the opener member 52 of the valve gear 9, and the U-shaped hook portion 63 is set to the engaging portion 55 of the opener member 52. The offset amount (rotational deformation amount) of the default spring 62, which sometimes occurs, is given in the opposite direction in advance when molding one coil spring 6, and then molded. Thereby, the offset amount of the default spring 62 when one coil spring 6 is set in the electronic control type throttle control device can be reduced.

  Therefore, when one coil spring 6 is set in the electronic control type throttle control device, as shown in FIGS. 1, 5 and 6, the opposite surface of the valve gear 9 (the side opposite to the outer wall surface of the bore wall portion 2). The outer peripheral surface of the spring inner peripheral guide 53 formed integrally with the opener member 52 and the inner peripheral surface (inner diameter side) of the default spring 62 are substantially concentric, and the outer peripheral surface of the spring inner peripheral guide 53 and the A substantially cylindrical gap can be formed between the spring 62 and the inner peripheral surface (inner diameter side). That is, a sliding portion between the outer peripheral surface of the spring inner peripheral guide 53 and the inner peripheral surface of the default spring 62 is not formed. Thereby, the sliding resistance in the relative movement when driving the throttle valve 3 from the intermediate position (default position) to the fully closed position side can be significantly reduced as compared with the conventional product.

  Thus, the throttle valve 3, the throttle shaft 4, and the valve gear 9 can be operated smoothly, so that the rotational load of the drive motor 5 can be reduced and the drive motor 5 can be downsized. In addition to the effect of reducing the number of parts and simplifying the configuration, and in addition to the effect of improving the opening position accuracy of the throttle valve 3 at the intermediate position, the throttle valve 3, when closing the throttle valve 3 from the intermediate position, The effect is obtained that the occurrence of malfunctions of the throttle shaft 4 and the valve gear 9 can be greatly reduced. Here, even if abrasion powder is generated from another portion of the valve gear 9 (for example, the tooth portion of the gear portion 51, the fully closed stopper portion 22, the fully opened stopper portion, etc.), there is no contact resistance or the contact resistance is lower than that of the conventional product. Therefore, the friction resistance does not deteriorate.

  For the above reason, the sliding resistance in the relative movement when driving the throttle valve 3 from the intermediate position (default position) to the fully closed position side can be reduced, so that the hysteresis of the spring load of one coil spring 6 can also be reduced. Therefore, the controllability of the throttle valve 3, the throttle shaft 4, and the valve gear 9 can be improved particularly at the time of low-speed rotation of the engine including idling operation of a vehicle such as an automobile. In addition, since the abrasion of the sliding portion between the outer peripheral surface of the spring inner peripheral guide 53 and the inner peripheral surface of the default spring 62 can be completely and completely prevented, deterioration of the sliding resistance with time can be prevented. That is, the durability of the default spring 62 of the coil spring 6 and the spring inner peripheral guide 53 of the valve gear 9 can be greatly improved, and a highly reliable electronically controlled throttle control device with little change in characteristics over time can be obtained.

  FIG. 7 shows a second embodiment of the present invention and is a view schematically showing the structure of an electronically controlled throttle control device.

  In the present embodiment, similarly to the first embodiment, the other end of the default spring 62 is set to the second locking portion (gear-side hook) 54 of the opener member 52 of the valve gear 9 and the U-shaped hook portion 63 is A single coil spring 6 having a coil shape in which the center axis of the default spring 62 is eccentric in advance is adopted on the side opposite to the direction of rotational deformation when set in the engagement portion 55 of the opener member 52.

  A spring body side hook (first locked portion) 64 which is one end of the return spring 61 of one coil spring 6 is locked to the first locking portion (body side hook) 27 of the throttle body 1. Have been. A spring gear side hook (second locked portion) 65, which is the other end of the default spring 62 of one coil spring 6, is attached to the second locking portion 54 of the opener member 52 of the valve gear (rotating body) 9. Is locked.

  The U-shaped hook portion 63 of one coil spring 6 is engaged with an engagement portion 55 provided between the lateral displacement prevention guides 56 of the opener member 52 of the valve gear 9. The spring between the second locking portion 54 and the engagement portion 55 of the opener member 52 of the valve gear 9, that is, between the spring gear side hook 65 of one coil spring 6 and the U-shaped hook portion 63. The inner peripheral guide 53 is provided at a predetermined distance in the axial direction.

  8 and 9 show a third embodiment of the present invention. FIG. 8 is a diagram showing one coil spring and a valve gear, and FIG. 9 is a diagram showing one coil spring.

  In the present embodiment, the other end of the default spring 62 of one coil spring 6 is extended in an S-shape so as to approach the U-shaped hook portion 63, and the S-shaped portion constitutes a spring gear side hook 65. are doing. A spring body side hook 64, which is one end of the return spring 61 of one coil spring 6, is locked to the first locking portion 27 of the throttle body 1. The spring gear side hook 65 of the default spring 62 of one coil spring 6 is locked to the second locking portion 54 of the opener member 57 of the valve gear 9. Further, the U-shaped hook 63 of one coil spring 6 is engaged with an engagement portion 55 provided between the lateral displacement prevention guides 56 of the opener member 52 of the valve gear 9.

  Further, in the present embodiment, the second locking portion 54 and the engaging portion 55 of the opener member 57 of the valve gear 9, that is, the spring gear side hook 65 of one coil spring 6 and the U-shaped hook portion 63 The valve gear 9 and the spring inner peripheral guide 53 are provided at a predetermined distance in a circumferential direction (for example, on substantially the same circumference). That is, the second locking portion 54 is provided on the opener member 57 of the valve gear 9 that extends leftward from the outer wall portion 58 surrounding the annular housing portion (not shown) that houses the default spring 62. I have. A concave portion 59 is provided at the base of the opener member 57 so as not to contact the other end of the default spring 62 of one coil spring 6. The window 60 having the concave portion 59 is open in the left direction in the drawing so that the spring gear side hook 65 can be passed when one coil spring 6 is assembled to the valve gear 9. The opener members 52 and 57 are formed integrally with the outer wall 58.

  Here, in the case of the first and second embodiments, when assembling one coil spring 6 to the valve gear 9, that is, the U-shaped hook portion 63 which is one end of the default spring 62 of one coil spring 6 is used. After being assembled to the engagement portion 55 of the opener member 52 of the valve gear 9, the spring gear side hook 65, which is the other end of the default spring 62 of one coil spring 6, is engaged with the second engagement of the opener member 52 of the valve gear 9. When assembled to the portion 54, the default spring 62 rotates around the second locking portion 54 in the left-hand rotation direction in the drawing, and the inner surface (inner peripheral surface) of the default spring 62 of one coil spring 6 There is a possibility that the outer peripheral surface of the spring inner peripheral guide 53 of the valve gear 9 slides. In particular, since the default spring 62 has a smaller number of turns of the spring coil than the return spring 61, the default spring 62 has a high spring constant (rigidity), and a strong force for slidingly contacting the outer peripheral surface of the spring inner peripheral guide 53 by rotation.

  Therefore, in the present embodiment, the second locking portion 54 and the engaging portion 55 of the opener member 57 of the valve gear 9, that is, the spring gear side hook 65 and the U-shaped hook portion 63 of one coil spring 6 are connected. The coil gear 6 is installed at a predetermined distance in the circumferential direction (for example, on substantially the same circumference) of the valve gear 9 and the spring inner circumferential guide 53, and a U-shaped hook portion 63 which is one end of the default spring 62 of one coil spring 6. And the other end of the spring gear side hook 65 are sandwiched between the second engagement portion 54 and the engagement portion 55 of the valve gear 9, so that one coil spring 6 is assembled to the valve gear 9. In other words, after assembling the U-shaped hook portion 63 of one coil spring 6 to the engaging portion 55 of the opener member 52 of the valve gear 9, Even when the spring gear side hook 65 of the fault spring 62 is assembled to the second locking portion 54 of the opener member 57 of the valve gear 9, it does not rotate around the second locking portion 54 and the default of one coil spring 6 The inner peripheral surface (inner peripheral surface) of the spring 62 and the outer peripheral surface of the spring inner peripheral guide 53 of the valve gear 9 do not slide.

  Therefore, even when one coil spring 6 is assembled to the throttle body 1 and the valve gear 9, a substantially cylindrical gap is reliably formed between the outer peripheral surface of the spring inner peripheral guide 53 of the valve gear 9 and the inner peripheral surface of the default spring 62. Therefore, the sliding resistance in the relative movement when driving the throttle valve 3 from the intermediate position (default position) to the fully closed position side can be significantly reduced as compared with the conventional product. Thereby, the same effect as in the first embodiment can be achieved.

  In this embodiment, when the other end of the default spring 62 is set to the second locking portion 54 of the opener member 52 of the valve gear 9 and the U-shaped hook portion 63 is set to the engaging portion 55 of the opener member 52, the rotation is performed. A single coil spring 6 having a coil shape in which the center axis of the default spring 62 is eccentric in advance is adopted on the side opposite to the deforming direction. The central axis of 62 need not be eccentric.

[Modification]
In this embodiment, the example in which the Hall element 13 is used as the non-contact type detection element has been described. However, a Hall IC, a magnetoresistive element, or the like may be used as the non-contact type detection element. Further, in the present embodiment, an example in which the split type permanent magnet 11 is employed as the magnetic field generation source has been described, but a cylindrical permanent magnet may be employed as the magnetic field generation source.

  In addition, as one coil spring 6, that is, as a return spring (first spring portion) 61 or a default spring (second spring portion) 62, particularly as a default spring (second spring portion) 62, the outer diameter of the coil is centered. Equal pitch coils with substantially the same axial direction and the same coil spacing, or unequal pitch coils with the same coil outer diameter in the center axis direction and with changed coil spacing, or with the coil outer diameter in the center axis direction (For example, a drum-shaped spring, a bale-shaped spring, a frusto-conical spring, etc.) may be used.

  In the present embodiment, a valve gear (rotating body) 9 which is a component of a gear reduction device (power transmission device) that transmits the rotation output of the drive motor 5 to the throttle valve 3 is provided on an opposing surface (an outer wall surface of the bore wall portion 2). The opener member 52 and the spring inner circumference guide 53 are integrally provided on the opposed surface), but the opener member and the spring inner circumference guide are integrally formed on the outer circumference of the throttle shaft 4 that rotates integrally with the throttle valve 3. It may be provided. In this case, the throttle shaft 4 forms a rotating body.

(A), (b) is explanatory drawing which showed the main structure of the electronic control type throttle control apparatus (Example 1). FIG. 1 is a cross-sectional view illustrating an entire structure of an electronic control type throttle control device (Example 1). FIG. 3 is a front view showing components such as a drive motor and a gear reduction device formed inside a gear case integrally formed on an outer wall surface of a throttle body (Example 1). FIG. 1 is a perspective view showing a schematic structure of an electronic control type throttle control device (first embodiment). (A) is a side view showing one coil spring, and (b) is a side view showing one coil spring (Example 1). (A) is a front view showing one coil spring, and (b) is an explanatory view showing a main structure of an electronic control type throttle control device (first embodiment). FIG. 5 is a perspective view illustrating a schematic structure of an electronic control type throttle control device (second embodiment). FIG. 10 is a side view showing one coil spring and a valve gear (Example 3). It is sectional drawing which showed one coil spring (Example 3). It is a perspective view showing the schematic structure of the electronic control type throttle control device (prior art). (A), (b) is explanatory drawing which showed the main structure of the electronic control type throttle control apparatus (prior art). (A) is a side view showing one coil spring, and (b) is a side view showing one coil spring (prior art). (A) is a front view showing one coil spring, and (b) is an explanatory diagram showing a main structure of an electronic control type throttle control device (prior art).

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Throttle body 2 Bore wall 3 Throttle valve 4 Throttle shaft 5 Drive motor (actuator)
6 One coil spring 9 Valve gear (rotating body)
24 Intermediate position stopper 25 Intermediate stopper member 27 First locking part (body side hook)
41 Pinion gear 42 Intermediate reduction gear 52 Opener member 53 Spring inner circumference guide 54 Second locking portion (gear side hook)
55 engagement part 61 return spring (first spring part)
62 Default spring (2nd spring part)
63 U-shaped hook part (joining part)
64 Spring body side hook (first locked part)
65 Spring gear side hook (second locked part)

Claims (9)

(A) a throttle body forming an intake passage inside;
(B) a throttle valve housed in the intake passage so as to be openable and closable;
(C) a power transmission device having a rotating body that transmits the rotational power of the actuator to the throttle valve and drives the throttle valve to rotate in a fully open direction and a fully closed direction; and (d) one end is connected to the throttle body. A single coil spring that is stopped and the other end is locked to the rotating body, and biases the throttle valve in a fully open direction or a fully closed direction,
The coil spring has a coil shape in which the center axis of the coil spring is eccentric in advance on the side opposite to the direction in which the other end of the coil spring is deformed when assembled to the rotating body. Electronically controlled throttle control. The electronically controlled throttle control device according to claim 1,
The coil spring is mounted between an outer wall surface of the throttle body and an opposing surface of the rotating body, the outer diameter of the coil is substantially the same in the center axis direction, and the pitch of the coil is the same pitch coil, or An electronically controlled throttle control device characterized in that the outer diameter of the coil is substantially the same in the direction of the central axis, and the coil is an irregular pitch coil in which the distance between the coils is changed, or a non-linear spring in which the outer diameter of the coil changes in the direction of the central axis. . The electronically controlled throttle control device according to any one of claims 1 and 2,
The rotator holds the inner diameter side of the coil spring of the coil spring, rotates integrally with the spring inner peripheral guide that operates relative to the coil spring, and the throttle valve, and fully opens or closes the coil spring. An electronically controlled throttle control device, wherein an opener member biased in a direction is integrally provided. The electronically controlled throttle control device according to claim 3,
A first spring portion having a return spring function for urging the throttle valve from a fully open position to an intermediate position via the opener member in a direction to return the throttle valve to a middle position, and fully closing the throttle valve via the opener member An electronically controlled throttle control device, comprising a single coil-shaped spring integrated with a second spring portion having an opener spring function for urging in a direction returning from a position to an intermediate position. The electronically controlled throttle control device according to claim 4,
The coil spring may be configured such that a coupling portion between the first spring portion and the second spring portion is bent into a substantially inverted U-shape to form a U-shaped hook portion, and one end of the first spring portion in the axial direction and the second spring portion. An electronically controlled throttle control device comprising a single coiled spring in which the other end of the two spring portions in the axial direction is wound in different directions. The electronically controlled throttle control device according to claim 4 or 5,
An intermediate stopper member that locks the U-shaped hook portion to hold the throttle valve at an intermediate position when power to the actuator is cut off for some reason; A first locking portion for locking one end portion,
The opener member has an engaging portion that is removably engaged with the U-shaped hook portion, and a second locking portion that locks the other end of the second spring portion. Electronically controlled throttle control. The electronically controlled throttle control device according to any one of claims 4 to 6,
The throttle valve is a butterfly-type rotary valve held and fixed to a valve holding portion of a throttle shaft rotatably supported by the throttle body,
The rotating body is a valve gear that rotates integrally with the throttle shaft,
The electronic control unit is characterized in that the spring inner circumference guide is integrally provided on an opposing surface of the valve gear opposing an outer wall surface of the throttle body so as to hold an inner diameter side of the second spring portion. Type throttle control device. The electronically controlled throttle control device according to claim 5,
The rotating body includes an engaging portion that is detachably engaged with the U-shaped hook portion, and a locking portion that is provided in a circumferential direction of the engaging portion and locks the other end of the coil spring. An electronically controlled throttle control device comprising: (A) a throttle body forming an intake passage inside;
(B) a throttle valve housed in the intake passage so as to be openable and closable;
(C) a power transmission device having a rotating body that transmits the rotational power of the actuator to the throttle valve and drives the throttle valve to rotate in a fully open direction and a fully closed direction; and (d) one end is connected to the throttle body. A single coil spring that is stopped and the other end is locked to the rotating body, and biases the throttle valve in a fully open direction or a fully closed direction,
A first spring portion having a return spring function for biasing the throttle valve from a fully open position to an intermediate position through the rotator, in a direction to return the throttle valve from the fully open position to an intermediate position; and the throttle valve is fully closed via the rotator. A second spring portion having an opener spring function for urging in a direction to return from the position to the intermediate position,
A connecting portion between the first spring portion and the second spring portion is bent into a substantially inverted U-shape to form a U-shaped hook portion, and one end of the first spring portion in the axial direction and a shaft of the second spring portion. One coil-shaped spring in which the other end of the direction is wound in a different direction,
The rotating body includes an engaging portion that is detachably engaged with the U-shaped hook portion, and a locking portion that is provided in a circumferential direction of the engaging portion and locks the other end of the coil spring. An electronically controlled throttle control device comprising:

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