JP2005140060A - Throttle device for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throttle controller for an internal combustion engine capable of reducing influence exerted on airtight performance when closing a valve fully by dimensional unevenness due to molding contraction. <P>SOLUTION: A valve angle of a throttle valve 1 when closing the valve fully is set to less than 90° for the direction of central axial line of a bore internal pipe 31 of a throttle body 5, and a first outside diameter side end part of a resin-made disc part 13 of the throttle valve 5 is brought into contact with a first seal face of a bore inside diameter face of the bore internal pipe 31 of the throttle body 5 airtightly prior to the resin-made disc part 14. Furthermore, the resin-made disc part 14 of the throttle valve 1 is elastically deformed by utilizing negative pressure (positive pressure generated on the intake upstream side in the case of an engine with a supercharger) generated on the intake downstream side to bring it into contact with a second seal face of the bore inside diameter face of the bore internal pipe 31 of the throttle body 5 airtightly when closing the valve fully. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a throttle device for an internal combustion engine mounted on a vehicle such as an automobile, for example. In particular, the valve drive device such as a drive motor is driven according to the accelerator operation amount of a vehicle occupant so that the throttle body can rotate freely. The present invention relates to a throttle control device for an internal combustion engine that controls a valve opening degree of a supported throttle valve.

  In recent years, for the purpose of improving fuel economy and reducing weight, a throttle body that forms an intake passage communicating with the cylinder of the internal combustion engine, and a throttle valve that adjusts an intake air amount toward the internal combustion engine by opening and closing the intake passage, A throttle device for an internal combustion engine integrally formed by molding has been proposed. Here, for example, as shown in FIG. 14, a valve drive device such as a drive motor is driven in accordance with the amount of depression of the accelerator pedal by the vehicle occupant to control the valve opening of the throttle valve by a predetermined amount. In the engine throttle control device, the bore inner surface of the substantially circular tube-shaped bore wall (circular tubular portion) of the throttle body 101 and the outer diameter of the substantially disk-shaped disk portion (disk-shaped portion) of the throttle valve 102. It is known that the gap formed between the side ends greatly affects the airtight performance when the valve is fully closed.

  For this reason, conventionally, the throttle body 101 and the throttle valve 102 are manufactured in separate steps in advance, and the outer diameter side end shape of the disk portion is matched to the finished bore inner diameter of the bore wall portion, or the disk portion. By aligning the bore inner diameter of the bore wall with the finish of the outer diameter side end of the bore and assembling them in the subsequent process, the bore inner diameter surface of the bore wall of the throttle body 101 and the disk portion of the throttle valve 102 are removed. A predetermined gap dimension is formed between the radial end portion. Here, reference numeral 103 denotes a throttle shaft that rotates by receiving rotational power from a valve drive device such as a drive motor. Both ends of the throttle shaft 103 in the axial direction (thrust direction) are connected to a cylindrical valve bearing 104 formed integrally with a bore wall portion of the throttle body 101 via bearing parts such as a thrust bearing and a ball bearing. And is supported rotatably.

  In contrast to the above-described throttle control device for an internal combustion engine, a throttle control device for an internal combustion engine has been proposed in which the number of manufacturing steps and the above-mentioned clearance dimension accuracy are improved (for example, see Patent Documents 1 and 2). In these methods, the throttle body 101 and the throttle valve 102 as shown in FIG. 15 are integrally formed by resin molding in the same resin molding die. After integrally forming by resin molding, the bore inner diameter surface of the bore wall portion of the throttle body 101 is used as a part of the resin molding die at the time of resin molding of the throttle valve 102, so that the bore inner diameter dimension of the bore wall portion is obtained. Is the resin molding method of the throttle valve 102 in which the shape of the outer diameter side end portion of the disk portion is matched with the quality of the disk, but in reality, the radial direction and the circumferential direction inside the bore wall portion are the resin molding molds. In order to perform resin molding of the throttle valve 102 in a state where it is restrained by the throttle body, the throttle body is removed during slow cooling after removal from the resin molding die. Disk portion of the bore wall portion and the throttle valve 102 of the 101 occurs deformation due to molding shrinkage after the resin molding (molding distortion or free deformation). Therefore, when the throttle body 101 and the throttle valve 102 are integrally formed by resin molding, it is difficult to maintain the above gap in a desired gap size.

  In this case, for example, the roundness in the circumferential direction of the bore inner surface of the bore wall portion of the throttle body and the roundness in the circumferential direction of the disc-shaped disc portion of the throttle shaft are reduced, and the bore inner diameter surface of the bore wall portion is reduced. And the outer diameter side end of the disk portion become larger than a desired gap size, the amount of intake air leakage increases when the valve is fully closed, and fuel used in an internal combustion engine (for example, If the amount of gasoline is controlled by the flow rate of the intake air, the increase in the intake air leakage amount when the valve is fully closed leads to deterioration in fuel consumption. On the other hand, as shown in FIG. 16, the throttle valve 102 is resin-molded inside the bore wall portion of the throttle body 101 at a valve angle other than the valve fully closed (right angle: 90 ° in the figure). Thus, in the structure in which the throttle body 101 and the throttle valve 102 are partitioned by the resin molding die, the bore inner diameter surface of the bore wall portion and the outer diameter side end portion of the disk portion are subjected to respective molding shrinkage or actual use. Although it becomes possible to make it with a resin molding die based on deformation, it is difficult to suppress this particularly for dimensional variations due to molding shrinkage.

  In particular, as shown in FIGS. 17 and 18, the bore inner diameter surface of the bore inner tube 106 of the bore wall portion 105 of the throttle body 101 and the first and second first and second disk portions 111 and 112 of the throttle valve 102. (2) When the airtight performance when the valve is fully closed is ensured by the gap formed between the end portion on the outer diameter side, the substantially circular valve contraction is determined by the size of the valve outer diameter, and the valve thickness direction ( Compared with the amount of shrinkage in the thickness direction), the amount of shrinkage varies greatly. Similarly, the bore contraction of the substantially circular tubular shape is also caused by the bore inner diameter of the bore inner tube 106 of the bore wall portion 105 and the peripheral shape of the throttle body 101 (for example, the shape of the gear housing portion or the connecting rib between the bore wall portion and the gear housing portion). Shape, the shape of the motor housing portion or the shape of the connecting rib between the bore wall portion and the motor housing portion, etc.), and further, the bore inner tube 106 of the bore wall portion 105 is held in a substantially circular tube shape on the bore inner diameter. This structure does not exist, and there is no means to counter the contraction deformation of the bore wall 105 of the throttle body 101 in the direction of the central axis of the bore inner tube 106. Therefore, there is a problem that the amount of contraction varies greatly. There is.

The bore inner diameter surface of the bore inner tube 106 of the bore wall portion 105 of the throttle body 101 and the first and second outer diameter sides of the first and second disk portions 111 and 112 of the throttle valve 102 with large variations in the amount of contraction. The gap formed between the end and the valve when the valve is fully closed has a large variation in the gap size, and there is a problem that the airtight performance when the valve is fully closed cannot be secured sufficiently. .
In order to eliminate such problems, an arc-shaped raised portion is integrally formed on the bore inner surface of the throttle body by resin molding, and the throttle valve and the seal surfaces of the two first and second raised portions are formed. There has been proposed a throttle device for an internal combustion engine that can be brought into contact to ensure airtight performance when the valve is fully closed (see, for example, Patent Document 3). A throttle body of the throttle device for an internal combustion engine includes a first raised portion corresponding to a substantially semicircular intake upstream side portion of a throttle valve disk portion on one end side of the throttle shaft, and a throttle shaft. On the other end side, a second raised portion corresponding to a substantially semicircular portion corresponding to a substantially semicircular intake downstream side portion of the disk portion of the throttle valve is integrally provided. The throttle valve is fastened and fixed to the valve holding portion of the throttle shaft using a screw member.
JP 05-141540 A (page 1-8, FIGS. 1-7) Japanese Patent No. 3315135 (page 1-8, FIGS. 1-7) JP 11-193726 A (page 1-5, FIGS. 1 to 4)

  However, in the throttle device for an internal combustion engine described in Patent Document 3, when the valve is fully closed, the respective seal surfaces of the intake upstream side portion and the intake downstream side portion of the disk portion of the throttle valve and the first and second raised portions of the throttle body. Are simultaneously formed by resin molding, and when the throttle valve is integrally formed by resin molding, it is caused by substantially circular valve contraction and substantially circular bore contraction. There is a problem that it is very difficult in consideration of dimensional variations due to molding shrinkage. Moreover, the throttle device for an internal combustion engine described in Patent Document 3 has a problem that the margin is low with respect to dimensional variations due to molding shrinkage in the direction of the rotation center axis of the throttle valve.

  The object of the present invention is to change the amount of molding shrinkage due to molding shrinkage after resin molding depending on the dimensions of the corresponding parts, and when the valve is fully closed, the first and second disk portions of the throttle valve and the bore inner diameter surface of the throttle body In view of the fact that it is difficult to contact the entire surface simultaneously, it is an object of the present invention to provide a throttle device for an internal combustion engine that can solve this problem.

  According to the first aspect of the present invention, in the throttle device for an internal combustion engine in which the throttle body and the throttle valve are made of resin, that is, integrated by resin molding, for the purpose of improving fuel consumption and reducing the weight of the throttle valve, The valve angle at the time of closing is set to be less than 90 ° with respect to the central axis direction of the throttle body, and further, the throttle valve is first positioned on the intake downstream side of the intake air flow direction when the valve is fully closed or fully opened. A disk part and a second disk part located upstream of the first disk part in the intake air flow direction when the valve is fully closed or fully opened are provided. In addition, a structure (method) in which the first disk portion of the throttle valve is brought into airtight contact with the bore inner surface of the throttle body and then the second disk portion of the throttle valve is brought into airtight contact with the bore inner surface of the throttle body. By adopting it, the amount of molding shrinkage due to molding shrinkage after resin molding changes depending on the dimensions of the corresponding parts, and when the valve is fully closed, the first and second disc parts of the throttle valve and the bore inner diameter surface of the throttle body Even if it is difficult to contact the entire surface simultaneously, the first and second disk portions of the throttle valve and the bore inner surface of the throttle body can be brought into airtight contact when the valve is fully closed. Thereby, it is possible to reduce the influence of the dimensional variation due to molding shrinkage of the resinized throttle body and throttle valve on the airtight performance when the valve is fully closed. In addition, a margin is also increased with respect to dimensional variations due to molding shrinkage in the direction of the rotation center axis of the throttle valve.

  According to the second aspect of the present invention, the substantially central shaft-shaped reinforcing member or the metal shaft is insert-molded inside the cylindrical portion of the throttle valve, so that the throttle valve integrated by resin molding is used as the reinforcing rib or the like. It can be reinforced without adopting a complicated shape. According to the third aspect of the present invention, the throttle shaft that rotates integrally with the throttle valve, the motor as the drive source, and the rotational power of the motor are supplied to the throttle shaft that rotates integrally with the throttle valve. And a power unit configured to include a power transmission device for transmission. As a result, a power unit such as a motor is driven in accordance with an accelerator operation amount such as an accelerator pedal depression amount by a vehicle occupant, and the valve angle of the throttle valve becomes a predetermined valve angle corresponding to the accelerator operation amount. Can be controlled. Furthermore, according to the fourth aspect of the present invention, the axial direction of the throttle shaft that rotates integrally with the throttle valve, that is, the rotational central axis direction of the throttle valve is set to the central axial direction of the bore wall portion of the throttle body. Necessary size and number of parts of the power transmission device that connects the motor output shaft and the throttle shaft by setting the direction so as to be substantially orthogonal and parallel to the direction of the central axis of the motor housing. Can be minimal.

  According to the fifth aspect of the present invention, when the valve is fully closed, the rotational force of the motor or the biasing force of the spring is used to bring the first disk portion into airtight contact with the bore inner surface of the throttle body, and the throttle A system is adopted in which the second disk portion is brought into airtight contact with the bore inner surface of the throttle body by utilizing a pressure difference between the pressure upstream of the valve and the pressure downstream of the intake. Thereby, when the valve is fully closed, it is possible to realize a structure in which the first disk portion is hermetically contacted with the bore inner surface of the throttle body before the second disk portion. As a result, when the valve is fully closed, the first and second disk portions of the throttle valve and the bore inner surface of the throttle body can be brought into contact with each other almost simultaneously and reliably, and the airtight performance when the valve is fully closed can be improved. .

  According to the sixth aspect of the present invention, in the case of a naturally aspirated engine in which intake air under atmospheric pressure conditions is sucked into the cylinder by the intake negative pressure generated from the cylinder, it is more effective than the throttle valve when the valve is fully closed. A supercharged engine that uses negative pressure (intake pipe negative pressure lower than atmospheric pressure) generated downstream of the intake air or forcibly sucks intake air that has been pressurized above atmospheric pressure by a turbocharger into the cylinder. In this case, the second disk portion of the throttle valve is elastically deformed by using the positive pressure (supercharging pressure higher than the atmospheric pressure) generated upstream of the throttle valve when the valve is fully closed, The disk portion is brought into airtight contact with the bore inner surface of the throttle body after the first disk portion, so that the dimension of the resinized throttle body and throttle valve can be reduced by molding shrinkage. For it is possible to reduce the impact on the airtightness performance of the valve is fully closed.

  According to the seventh aspect of the present invention, when the valve is fully closed, first, the first outer diameter side end portion of the first disc portion of the throttle valve has a substantially semicircular outer end on the entire circumference of the bore inner diameter surface of the throttle body. One of them is in airtight contact with the substantially semicircular first seal surface. Thereafter, the substantially semicircular second outer diameter side end portion of the second disc portion of the throttle valve is the second semicircular second seal surface on the other side of the entire circumference of the bore inner diameter surface of the throttle body. In an airtight manner. As a result, when the valve is fully closed, the first and second disk portions of the throttle valve and the bore inner surface of the throttle body can be brought into contact with each other almost simultaneously and reliably, and the airtight performance when the valve is fully closed can be improved. .

  According to the eighth aspect of the present invention, the intake air of the substantially semicircular first protrusion formed so that the first seal surface protrudes to the inner diameter side from the bore inner diameter surface of the throttle body. Provided on the downstream side surface of the intake air in the flow direction, and the second seal surface is formed in a substantially semicircular second projection portion formed so as to protrude from the bore inner diameter surface of the throttle body toward the inner diameter side. It is provided on the intake upstream side in the flow direction. As a result, in the prior art, the substantially semicircular disk-shaped first and second disk portions of the throttle valve have outer diameter side ends and the substantially semicircular shaped seal surfaces of the bore inner diameter surface of the throttle body. Only the gap formed between them, which has secured the airtight performance when the valve is fully closed, the first outer diameter side end of the first disk portion of the throttle valve is the first protrusion on the bore inner diameter surface of the throttle body. After making airtight contact with the first seal surface provided in the portion, the second disc portion of the second valve portion of the throttle valve and the second protrusion provided on the end surface of the inner diameter surface of the bore of the throttle body. 2 gaps formed between the two seal surfaces and a gap formed between the end surface of the second outer diameter side end of the second disk portion of the throttle valve and the bore inner diameter surface of the throttle body. Pressure loss due to the clearance causes the throttle valve to The second outer diameter end of the second disk portion, the bending moment in the valve fully closed around the rotation center axis of the throttle valve occurs. As a result, the second outer diameter side end portion of the second disk portion of the throttle valve is elastically deformed, so that the second outer diameter side end portion of the second disk portion of the throttle valve becomes the first inner diameter surface of the bore of the throttle body. 2 in airtight contact with the second seal surface provided on the protrusion. Therefore, since the airtight performance when the valve is fully closed can be secured, the influence of the dimensional variation due to molding shrinkage of the resinized throttle body and the throttle valve on the airtight performance when the valve is fully closed can be further reduced.

  According to the ninth aspect of the present invention, the first protrusion is provided continuously on one side of the entire circumference of the bore inner diameter surface of the throttle body and in the circumferential direction at substantially the same height. In addition, the second protrusion is provided continuously on the other side of the entire circumference of the bore inner diameter surface of the throttle body in the circumferential direction at substantially the same height. As a result, it is possible to further reduce the influence of the dimensional variation due to molding shrinkage of the resinized throttle body and throttle valve on the airtight performance when the valve is fully closed. According to the tenth aspect of the present invention, the first and second outer diameter side ends of the first and second disc portions of the throttle valve in the direction of the central axis of the throttle body A groove portion, a flat portion, or a substantially linear portion is provided in the parallel direction. Thereby, the space (space) in which the molding die enters the gap formed between the bore inner diameter surface of the throttle body and the first and second outer diameter side ends of the first and second disk portions of the throttle valve. Can be secured. As a result, when the valve is fully closed, the gap dimension formed between the bore inner diameter surface of the throttle body and the first and second outer diameter side ends of the first and second disk parts of the throttle valve is set to a desired gap dimension. Can be formed. The shape of the bore inner surface of the throttle body is such that when the throttle body and the throttle valve are molded with resin almost simultaneously in the same molding die, that is, the throttle valve is rotatably assembled inside the throttle body. Thus, an optimal body shape is obtained when resin molding is performed.

  According to the eleventh aspect of the present invention, when the valve is fully closed, the first and second outer diameter side ends of the first and second disc portions of the throttle valve in the direction of the rotation center axis and the throttle body are disposed inside the throttle body. A body side joint for hermetically sealing the bore inner surface is formed by insert molding or integrally. Then, by configuring the body side joint with a material that is not compatible or adhesive with the resin material forming the throttle body or throttle valve, the throttle body and the throttle valve are completely formed by the molding die and the body side joint. Can be partitioned. As a result, the throttle body and the throttle valve can be resin-molded substantially simultaneously in the same molding die.

  According to the invention described in claim 12, when the dimension in the thickness direction of the first and second disk parts of the throttle valve is t, and the dimension in the radial direction of the first and second disk parts is Rv, t < It is characterized by satisfying the relationship of Rv. Thereby, the dimension of the valve | bulb thickness direction which can further reduce the dimensional dispersion | variation by shaping | molding shrinkage | contraction can be obtained. In addition, since the amount of elastic deformation of the second disc part of the throttle valve can be increased, the effect of dimensional variations due to resin-made throttle body and throttle valve molding shrinkage on the airtight performance when the valve is fully closed is further reduced. can do.

  In the best mode for carrying out the present invention, when the valve is fully closed, the gap formed between the bore inner surface of the throttle body and the first and second disk portions of the throttle valve is maintained at a desired gap size. For this purpose, the valve angle when the valve is fully closed is less than 90 ° with respect to the central axis direction of the throttle body, and further, the first disk portion (the intake downstream valve end face located on the intake downstream side in the intake air flow direction) ) Is airtightly contacted with the bore inner surface of the throttle body prior to the second disk portion (intake upstream valve end surface) located upstream of the intake air in the intake air flow direction. did.

[Configuration of Example 1]
1 to 4 show a first embodiment of the present invention. FIG. 1 is a diagram showing the overall structure of an electronically controlled throttle control device, and FIG. 2 is integrally formed on the outer wall surface of the throttle body. FIG. 3 is a view showing each component part such as a drive motor and a gear reduction device configured inside the gear box portion, and FIG. 3 is a view showing a bore wall portion of a double pipe structure of the throttle body.

  The electronically controlled throttle control device of this embodiment includes a throttle valve 1 that adjusts the amount of intake air to the internal combustion engine (engine), and a drive motor (actuator) that rotationally drives the throttle valve 1 in the fully open direction (or fully closed direction). , Valve drive means) 3, a coil spring 4 that urges the throttle valve 1 in the fully closed direction, and a gear reduction device (power transmission device) that transmits the rotational output of the drive motor 3 to the throttle valve 1 and the throttle shaft 2. An actuator case that rotatably accommodates each gear constituting the gear reduction device, a throttle body 5 that forms an intake passage to each cylinder of the engine, and an engine control device (engine control) that electronically controls the drive motor 3 An intake air control apparatus for an internal combustion engine.

  Here, the ECU opens the accelerator opening that converts how much the accelerator pedal is depressed by the vehicle occupant (accelerator operation amount) into an electrical signal (accelerator opening signal) and outputs how much the accelerator pedal is depressed to the ECU. A sensor (not shown) is connected. The electronic control type throttle control device has a throttle position sensor that converts the opening of the throttle valve 1 into an electrical signal (throttle opening signal) and outputs to the ECU how much the throttle valve 1 is open. Yes. Then, the ECU of this embodiment performs proportional-integral-derivative control (PID control) on the drive motor 3 so that there is no deviation between the throttle opening signal from the throttle position sensor and the accelerator opening signal from the accelerator opening sensor. Is configured to perform feedback control.

  The throttle position sensor includes a split (substantially square) permanent magnet 10 that is a magnetic field generation source, a split (substantially arc-shaped) yoke (magnetic body: not shown) magnetized by the permanent magnet 10, Conductive metal for electrically connecting a hall element (not shown) integrally disposed on the sensor cover 12 side so as to face the split permanent magnet 10 and this hall element and an external ECU. A terminal (not shown) made of a thin plate and a stator (not shown) made of an iron-based metal material (magnetic material) for concentrating the magnetic flux to the Hall element. The split-type permanent magnet 10 and the split-type yoke are fixed to the inner peripheral surface of the valve gear 16 that is one of the components of the gear reduction device using an adhesive or the like.

  The throttle valve 1 of this embodiment is a substantially disc-shaped butterfly type rotary valve (resin valve) having a rotation center axis in a direction substantially orthogonal to the center axis direction of the bore wall portion 6 of the throttle body 5. The amount of intake air taken into the engine is controlled by changing the rotation angle from the fully closed position to the fully open position. The throttle valve 1 includes a substantially semi-disc-shaped first resin disc (first plate-like portion, first disc portion: hereinafter referred to as a resin-made disc portion) 13, and a substantially semi-disc-shaped second resin disc (first disc). 2 plate-like portion, second disc portion: hereinafter referred to as resin disc portion) 14, substantially cylindrical resin shaft (cylindrical portion: hereinafter referred to as resin shaft portion) 15, and medium shaft round bar-shaped metal shaft portion (Metal shaft: hereinafter referred to as throttle shaft) 2 or the like. The resin disk portions 13 and 14 are substantially circular with a resin material such as a thermoplastic resin (heat-resistant resin: for example, polyphenylene sulfide: PPS, or polyamide resin: PA, or polypropylene: PP, or polyetherimide: PEI). It is formed in a plate shape. In addition, the resin-made disc part 13 comprises the resin-made disc part 14, and comprises the substantially disc-shaped resin-made disc part (disk-shaped part).

  As shown in FIG. 4A, the resin disk portion 13 is provided so as to be positioned on the intake downstream side in the intake air flow direction when the valve is fully closed or when the valve is fully open. Further, as shown in FIG. 4A, the resin disk portion 14 is provided so as to be positioned on the intake upstream side in the flow direction of intake air when the valve is fully closed or when the valve is fully open. The resin disc portions 13 and 14 are formed in a substantially semicircular shape centering on the central axis of the bore wall portion 6 of the throttle body 5. The radially outer diameter side of the resin disk portion 13 has a substantially semicircular first shape on one side of the entire circumference of the bore inner diameter surface of the bore wall portion 6 of the throttle body 5 when the valve is fully closed. A substantially semicircular first outer diameter side end portion that hermetically contacts the seal surface is provided. Further, on the outer diameter side of the resin disk portion 14 in the radial direction, when the valve is fully closed, a second, substantially semicircular shape on the other side of the entire circumference of the bore inner diameter surface of the bore wall portion 6 of the throttle body 5 is provided. A substantially semicircular second outer diameter side end portion that hermetically contacts the seal surface is provided.

  The resin disc portions 13 and 14 are formed so that both end faces are located on the same plane. Further, as shown in FIG. 4B, the throttle valve 1 of the present embodiment has a valve angle when the valve is fully closed with respect to the central axis direction of the bore inner pipe 31 of the bore wall portion 6 of the throttle body 5. When the valve is fully closed, the resin disc 13 is hermetically contacted with the bore inner surface of the bore wall 6 of the throttle body 5 before the resin disc 14. I have. Here, one end surface of the resin disk portion 13 (for example, an upstream end surface positioned upstream in the flow direction of the intake air when the valve is fully closed) or both end surfaces are used for reinforcement to reinforce the resin disk portion 13. Ribs (not shown) are integrally formed by resin molding. The resin shaft portion 15 is formed in a substantially cylindrical shape from the same resin material as the resin disk portions 13 and 14. The resin shaft portion 15 is integrally formed on the outer periphery of the valve holding portion of the throttle shaft 2 by resin molding. As a result, the throttle valve 1 and the throttle shaft 2 can be integrated and rotated integrally. Note that both end portions of the resin shaft portion 15 in the rotation center axis direction (axial direction) are in the rotation center axis direction (axial direction) of the resin disk portions 13 and 14 of the throttle valve 1 as shown in FIG. Both end portions (outer diameter side end portions of the throttle valve 1) are provided on substantially the same plane.

  The throttle shaft 2 is a metal shaft formed in the shape of a round shaft with a metal material such as brass or stainless steel, for example, in a direction substantially perpendicular to the central axis direction of the bore wall portion 6 of the throttle body 5, and The axial direction is set so as to be parallel to the central axis direction of the motor housing portion 7. Here, the throttle shaft 2 of the present embodiment has a metal valve holding portion for holding and fixing the resin shaft portion 15 of the throttle valve 1, and the resin disc portions 13 and 14 and the resin shaft portion of the throttle valve 1. 15 is reinforced and insert-molded inside the resin shaft portion 15 with both ends projecting from both end surfaces of the resin shaft portion 15 in the rotational center axis direction.

  Further, the left end portion (one end portion) of the throttle shaft 2 is exposed (protruded) from one end face of the resin shaft portion 15 of the throttle valve 1 so that the first valve bearing of the bore wall portion 6 of the throttle body 5 is exposed. It functions as a first bearing sliding portion that slides rotatably within the portion 41. Further, the right end portion (the other end portion) of the throttle shaft 2 is exposed (projected) from the other end surface of the resin shaft portion 15 of the throttle valve 1, and the second valve bearing portion of the bore wall portion 6 of the throttle body 5 is exposed. It functions as a second bearing sliding portion that slides in a freely rotating manner (not shown). A valve gear 16 that is one of the components of the gear reduction device is integrally formed at the right end (other end) of the throttle shaft 2 in the figure.

  Here, the actuator case of the present embodiment includes a gear box portion (gear housing portion, case body) 11 integrally formed on the outer wall surface of the bore wall portion 6 of the throttle body 5 by resin molding, and the gear box portion. 11 and the sensor cover (gear cover, cover) 12 for holding the hall element of the throttle position sensor, the terminal, and the stator. The gear box portion 11 is formed in a predetermined shape by the same resin material as that of the bore wall portion 6 and forms a gear chamber in which each gear constituting the gear reduction device is rotatably accommodated. Further, on the inner wall surface of the gear box portion 11, a fully closed stopper 17 for restricting the rotational operation of the throttle valve 1 in the fully closed direction at the fully closed position of the throttle valve 1 is integrally formed by resin molding. ing. Note that the fully closed stopper 17 may not be provided.

  The sensor cover 12 is formed in a predetermined shape by a resin material such as a thermoplastic resin that can electrically insulate between the terminals of the throttle position sensor described above and between the motor energization terminals for the drive motor 3. Yes. The sensor cover 12 has a fitted portion that is fitted to a fitting portion provided on the opening side of the gear box portion 11 of the throttle body 5 and is formed by rivets, screws (not shown), heat caulking, or the like. The gear box part 11 is assembled to the opening side end part. The sensor cover 12 is integrally formed with a cylindrical connector receiving portion 18 to which a connector (not shown) is connected by resin molding.

  The drive motor 3 of the present embodiment is integrally connected to a motor energization terminal embedded in the sensor cover 12 and the substantially cylindrical motor housing portion 7, and when energized, a motor shaft (not shown) is provided. It is an electric actuator (drive source) that rotates in the forward direction or the reverse direction. The drive motor 3 is housed and held in the motor housing portion 7 with the front end frame 19 being fastened and fixed to the projection portion 21 of the motor housing portion 7 or the gear box portion 11 using a fastener 20 such as a fastening screw. Yes. In addition, a buffer material (or drive) such as a leaf spring for preventing engine vibration from being transmitted to the drive motor 3 between the rear end frame or end yoke (not shown) of the drive motor 3 and the bottom wall surface of the motor housing portion 7. A vibration isolating material for improving the vibration resistance of the motor 3 may be attached.

  The gear reduction device reduces the rotation speed of the drive motor 3 to a predetermined reduction ratio, and a pinion gear 22 fixed to the outer periphery of the motor shaft of the drive motor 3 and an intermediate portion that meshes with the pinion gear 22 and rotates. This is a valve driving means that has a reduction gear 23 and a valve gear 16 that rotates in mesh with the intermediate reduction gear 23 and that rotationally drives the throttle valve 1 and its throttle shaft 2. The pinion gear 22 is a motor gear that is integrally formed of a metal material in a predetermined shape and rotates integrally with the motor shaft of the drive motor 3. The intermediate reduction gear 23 is integrally formed in a predetermined shape with a resin material, and is rotatably fitted on the outer periphery of a support shaft 24 that forms the center of rotation. The intermediate reduction gear 23 is provided with a large-diameter gear 25 that meshes with the pinion gear 22 and a small-diameter gear 26 that meshes with the valve gear 16. Further, the support shaft 24 is integrally formed by resin molding on the bottom wall surface of the gear box portion 11 of the throttle body 5, and the tip portion thereof is fitted into a concave portion formed on the inner wall surface of the sensor cover 12. Yes.

  The valve gear 16 is integrally formed of a resin material into a predetermined substantially annular shape, and a gear portion (tooth portion) 27 that meshes with the small-diameter gear 26 of the intermediate reduction gear 23 is integrally formed on the outer peripheral surface of the valve gear 16. Has been. Further, the outer peripheral portion of the cylindrical portion integrally formed so as to protrude from the body side surface (bore wall side surface) of the valve gear 16 toward the left in the figure is a spring that holds the coil inner diameter side of the coil spring 4. It functions as an inner periphery guide (not shown). It should be noted that the outer peripheral portion of the valve gear 16, that is, one end surface in the circumferential direction of the gear portion 27, is an all-enclosed portion that is locked by the full-close stopper 17 when the throttle valve 1 is closed to the full-close position. The closing stopper portion 28 is integrally formed. In addition, the fully closed stopper part 28 does not need to be provided.

  The coil spring 4 is mounted on the outer peripheral side of the throttle shaft 2, and the right end portion (the other end portion) of the coil spring 4 is provided on the outer wall surface of the bore wall portion 6 of the throttle body 5, that is, the bottom wall surface of the gear box portion 11. Further, the left end portion (one end portion) is held by a gear side hook provided on the side surface of the bore wall portion of the valve gear 16.

  The throttle body 5 has a tubular bore wall portion 6 that accommodates the throttle valve 1 in an openable and closable manner, and a circular intake passage through which intake air (air) directed to the engine flows. The throttle housing is a device that holds the throttle valve 1 in the bore inner diameter (inside the intake passage) of the bore wall 6 so as to be rotatable in the rotational direction from the fully closed position to the fully open position. The intake manifold is fastened and fixed using fasteners (not shown) such as fixing bolts and fastening screws.

  Here, the bore wall portion 6 of the throttle body 5 of this embodiment is made of, for example, a resin material such as a thermoplastic resin (heat-resistant resin: for example polyphenylene sulfide: PPS, or polyamide resin: PA, or polypropylene: PP, or polyether. (I.e., imide: PEI) formed in a predetermined shape, on the outer diameter side in the radial direction of the substantially circular bore inner pipe (inner diameter side cylindrical portion forming the bore inner diameter) 31, It is formed in a double pipe structure in which a pipe (an outer diameter side cylindrical part forming the outer shell of the throttle body 5) 32 is disposed. The bore inner pipe 31 and the bore outer pipe 32 are an air inlet (intake passage) for sucking intake air from an air cleaner (not shown) through an intake pipe (not shown), and a surge tank or intake manifold of the engine. Has an air outlet (intake passage) for allowing the intake air to flow in, and has substantially the same inner and outer diameters in the flow direction of the intake air (the direction from the upper end side in the drawing toward the lower end side in the drawing). It is integrally formed by resin molding.

  Here, as shown in FIG. 1, the throttle body 5 of the present embodiment is directed to the central axis direction of the bore wall portion 6 rather than the side wall surface of the bore outer tube 32 of the bore wall portion 6 of the double tube structure. A motor housing portion 7 for housing and fixing the drive motor 3 is integrally formed by resin molding in parallel with a plurality of plate-like connecting portions 9 on the outer diameter side in the radial direction. The motor housing portion 7 is integrally formed by resin molding on the left end surface of the container-shaped gear box portion 11 for rotatably housing each gear of the gear reduction device. The motor housing portion 7 has a substantially cylindrical side wall portion 36 extending in the left direction from the left end surface of the gear box portion 11 in the drawing direction, and a substantially annular shape for closing the left side opening side of the side wall portion 36 in the figure. The bottom wall portion 37 is provided. The central axis direction of the side wall portion 36 of the motor housing portion 7 is set to be parallel to the axial direction of the throttle shaft 2 (rotational central axis direction of the throttle valve 1), and the bore wall portion 6 is set in a direction substantially orthogonal to the central axis direction. As shown in FIG. 1, the plurality of flat connection portions 9 are integrated by resin molding so as to reach the side wall surface of the side wall portion 36 of the motor housing portion 7 from the side wall surface of the bore outer tube 32 of the bore wall portion 6. A rib structure formed in a special manner is provided.

  An intake passage through which intake air directed to the engine flows is formed in the bore inner pipe 31, and the throttle valve 1 and the throttle shaft 2 are rotatably incorporated in the intake passage. A cylindrical space (cylindrical space) formed between the bore inner tube 31 and the bore outer tube 32 is partitioned by a substantially annular ring-plate-shaped connecting portion 33. The annular plate-like connecting portion 33 is almost entirely around a part of the cylindrical space, that is, substantially in the center of the cylindrical space (in the radial direction of the axial center portion of the throttle shaft 2 near the fully closed position of the throttle valve 1). It functions as an annular connecting portion that connects the outer periphery of the bore inner tube 31 and the inner periphery of the bore outer tube 32 so as to cross over. The cylindrical space on the upstream side of the annular plate-like connecting portion 33 is a blocking recess (moisture trap groove) 34 for blocking moisture flowing in along the inner peripheral surface of the intake pipe. . Further, the cylindrical space on the downstream side of the annular plate-like connecting portion 33 is a blocking recess (moisture trap groove) 35 for blocking moisture flowing in along the inner peripheral surface of the intake manifold. .

  Further, on the one side of the entire circumference of the bore inner diameter surface corresponding to the inner wall surface of the bore inner pipe 31, the first outer diameter side of the resin disc portion 13 of the throttle valve 1 when the valve of the throttle valve 1 is fully closed. A substantially semicircular first sealing surface with an end portion in airtight contact is provided. Further, on the other side of the entire circumference of the bore inner diameter surface of the bore inner pipe 31, when the throttle valve 1 is fully closed, the second outer diameter side end portion of the resin disk portion 14 of the throttle valve 1 is airtight. A substantially semi-circular second seal surface that contacts is provided. These first and second sealing surfaces are continuously provided in the circumferential direction. The first seal surface is provided downstream of the second seal surface in the intake air flow direction, and is provided in a step difference from the second seal surface in the central axis direction of the bore wall 6. .

  Further, the bore inner tube 31 and the bore outer tube 32 are provided with a first valve bearing portion 41 having a substantially cylindrical shape that rotatably supports the first bearing sliding portion of the throttle shaft 2 and a second bearing slide of the throttle shaft 2. A substantially cylindrical second valve bearing portion (not shown) that rotatably supports the moving portion is integrally molded with resin. The first valve bearing portion 41 is provided with a round shaft-shaped first shaft through-hole 43, and the second valve bearing portion has a round-hole-shaped second shaft through-hole (not shown). Is provided. A plug (not shown) for closing the opening side of the first valve bearing portion 41 is attached to the opening side end portion of the first valve bearing portion 41. The second valve bearing portion is integrally formed so as to protrude from the outer wall surface of the bore wall portion 6 of the throttle body 5, that is, the bottom wall surface of the gear box portion 11, toward the right in the figure, and its outer periphery. The portion functions as a spring inner peripheral guide (not shown) that holds the coil inner diameter side of the coil spring 4. A mounting stay 45 is integrally formed on the outer peripheral portion of the bore outer pipe 32 by resin molding to be coupled to a coupling end surface of the intake manifold of the engine using a fastener (not shown) such as a fastening bolt. ing. The mounting stay 45 is provided so as to protrude from the outer wall surface of the lower end portion of the bore outer tube 32 to the outer diameter side in the radial direction, and is inserted in a round hole shape through which a fastener such as the fastening bolt is inserted. A plurality of holes 46 are formed.

[Production Method of Example 1]
Next, a method for manufacturing the electronically controlled throttle control device of this embodiment will be briefly described with reference to FIGS.

  The resin molding die (injection molding die) of the present embodiment is mainly composed of a fixed die and a movable die that can move forward and backward with respect to the fixed die. In the present embodiment, when the resin mold is clamped, the resin disk portions 13 and 14 of the throttle valve 1 and the mold surfaces of the fixed mold and the movable mold are separated. A valve cavity having a shape corresponding to the product shape of the resin shaft portion 15 and a body cavity having a shape corresponding to the product shape of the bore wall portion 6 of the double pipe structure of the throttle body 5 are formed. Note that the valve cavity and the body cavity are partitioned by a fixed mold or a movable mold. The valve cavity and the body cavity are connected to a resin material supply device that supplies a resin material into the resin molding die. This resin material supply device is made of a resin material that is heated and melted in a valve cavity (for example, a thermoplastic resin such as PPS or PBT) at the front ends of a plurality of resin flow paths that send the resin material into a resin mold. One or two or more valve gates for injecting a molten resin) and a molten resin material (for example, a molten resin made of a thermoplastic resin such as PPS or PBT) that is heated in the body cavity. One or more body gates. The body gate may be provided on either the bore inner tube 31 side or the bore outer tube 32 side of the bore wall portion 6 of the throttle body 5 or the motor housing portion 7 side.

In this embodiment, in order to achieve the purpose of molding the throttle valve 1 with the throttle body 5 almost simultaneously with the throttle body 5 in the same resin molding die as the throttle body 5, the throttle valve 1 At a position that rotates a predetermined angle from the fully closed position (rotational angle larger than the fully closed position of the throttle valve 1), that is, at a rotational angle (θ) other than the fully closed position of the throttle valve 1 inside the throttle body 5. The valve cavity and the body cavity are formed so as to be assembled. The rotation angle at this time is such that the rotation angle (valve angle) of the throttle valve 1 when the valve is fully closed is α (≧ 0 °) with respect to the substantially cylindrical bore inner pipe 31, and the throttle valve 1 becomes the throttle body 5. When the contact rotation angle (valve angle) is β (≦ 180 °), resin molding is performed at the rotation angle (θ) shown in the following equation 1. As a result, the outer diameter of the throttle valve 1 excluding the gap between the outer diameter side end of the throttle valve 1 in the rotation center axis direction (axial direction) and the bore inner diameter surface in the vicinity of the first and second valve bearing portions 41. The side end portion and the bore inner diameter surface of the bore inner tube 31 can be partitioned by a fixed mold or a movable mold of a resin mold.
[Equation 1]
α <θ <β

First, in a valve cavity and a body cavity formed by a resin mold including a fixed mold and a movable mold, a molten resin material (for example, a molten resin made of a thermoplastic resin such as PPS or PBT: (Hereinafter referred to as a molten resin) is injected from one or more valve gates and one or more body gates, and the molten resin is filled into the valve cavities and body cavities of the resin mold (injection Filling step). At this time, the throttle shaft 2 is held at predetermined positions in the valve cavity and the body cavity by a shaft holding portion (not shown) provided in the resin molding die.
Next, the molten resin pressure in the resin molding die (resin pressure in the die) is gradually increased to perform holding pressure at a molten resin pressure larger than the maximum molten resin pressure at the time of injection. That is, a predetermined pressure is applied to the molten resin in the resin molding die, and cooling water is introduced into the resin molding die, and the molten resin contracted by the cooling water is supplied to one or more valve gates. Then, the valve cavity and the body cavity are replenished from one or more body gates (pressure-holding step).

  Next, the molten resin filled in the valve cavity and body cavity of the resin mold is taken out and cooled to be cured (solidified), or the molten resin is cooled in the valve cavity and body cavity of the resin mold. When it is cooled and hardened (solidified) with water or the like, a resin-molded product in which the throttle valve 1 and the throttle shaft 2 are rotatably incorporated inside the throttle body 5 having the bore wall portion 6 having a double pipe structure. The product is manufactured by injection molding of a resin member (molten resin). At this time, the throttle shaft 2 is insert-molded inside the resin molded product, that is, inside the resin shaft portion 15 of the throttle valve 1.

[Operation of Example 1]
Next, the operation of the electronically controlled throttle control device of this embodiment will be briefly described with reference to FIGS.

  When the driver (driver) steps on the accelerator pedal, an accelerator opening signal is input to the ECU from the accelerator opening sensor. The drive motor 3 is energized so that the throttle valve 1 is at a predetermined angle by the ECU, and the motor shaft of the drive motor 3 rotates. Then, the torque of the drive motor 3 is transmitted to the pinion gear 22, the intermediate reduction gear 23 and the valve gear 16. Thereby, the valve gear 16 rotates the rotation angle corresponding to the depression amount of the accelerator pedal against the urging force of the coil spring 4. Accordingly, since the valve gear 16 rotates, the throttle shaft 2 rotates at the same rotation angle as that of the valve gear 16, and the throttle valve 1 is rotationally driven in a direction to open from the fully closed position to the fully opened position (fully opened direction). As a result, the intake passage formed in the bore inner pipe 31 of the throttle body 5 is opened by a predetermined angle, so that the rotational speed of the engine is changed to a speed corresponding to the depression amount of the accelerator pedal.

  Conversely, when the driver removes his / her foot from the accelerator pedal, the throttle valve 1, throttle shaft 2, valve gear 16 and accelerator pedal are moved to their original positions (idling position, throttle valve 1 fully closed position) by the biasing force of the coil spring 4. Is returned to. When the driver returns the accelerator pedal, an accelerator opening signal (0%) is output from the accelerator opening sensor, so that the ECU 3 controls the drive motor 3 so that the throttle valve 1 reaches the opening when the valve is fully closed. You may make it reversely rotate the motor shaft of the drive motor 3 by supplying with electricity. In this case, the throttle valve 1 can be rotationally driven by the drive motor 3 in the fully closed direction.

  When the valve is fully closed, as shown in FIG. 4B, first, the rotational power of the motor or the urging force of the coil spring 4 is used to make a substantially semicircular circumference of the resin disc portion 13 of the throttle valve 1. The first outer-diameter-side end of the shape is in airtight contact with the substantially semicircular first seal surface on one side of the entire circumference of the bore inner-diameter surface of the bore inner tube 31 of the throttle body 5. At this time, in the case of a naturally aspirated engine in which intake air under atmospheric pressure is sucked into the cylinder by the intake negative pressure generated from the cylinder, a negative pressure (lower than the atmospheric pressure) generated downstream of the throttle valve 1 The resin disk portion 14 of the throttle valve 1 is elastically deformed using the intake pipe negative pressure. As a result, the substantially semicircular second outer diameter side end of the resin disc portion 14 of the throttle valve 1 is substantially the other side of the entire circumference of the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5. Airtightly contacts the semicircular second sealing surface. As a result, when the valve is fully closed, the resin disk portions 13 and 14 of the throttle valve 1 and the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 can be brought into contact with each other almost simultaneously and reliably. Airtight performance can be enhanced. As a result, the intake passage to the engine is fully closed, and the rotational speed of the engine becomes the idle rotational speed.

[Effect of Example 1]
As described above, in the electronically controlled throttle control apparatus in which the throttle valve 1 and the throttle body 5 are made of resin, that is, integrated by resin molding, for the purpose of improving fuel efficiency and weight reduction, as shown in FIG. Further, the valve angle of the throttle valve 1 when the valve is fully closed is set to be less than 90 ° with respect to the central axis direction of the bore inner pipe 31 of the bore wall portion 6 of the throttle body 5. Further, the amount of molding shrinkage due to molding shrinkage after resin molding changes depending on the dimensions of the corresponding parts, and when the valve is fully closed, the first and second outer diameter side ends of the resin disc portions 13 and 14 of the throttle valve 1 Even if it is difficult to bring the entire portion into contact with the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5, the resin disk portion 13 of the throttle valve 1 is connected to the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5. By adopting a structure (method) in which the resin disc portion 14 of the throttle valve 1 is brought into airtight contact with the bore inner surface of the bore inner pipe 31 of the throttle body 5 after being brought into airtight contact with the valve. Sometimes, the resin disk portions 13 and 14 of the throttle valve 1 and the bore inner surface of the bore inner tube 31 of the throttle body 5 can be brought into airtight contact. Thereby, it is possible to reduce the influence of the dimensional variation due to molding shrinkage of the resinized throttle valve 1 and throttle body 5 on the hermetic performance when the valve is fully closed. In addition, the margin is increased with respect to dimensional variations due to molding shrinkage of the throttle valve 1 in the rotation center axis direction.

Further, a gap formed between the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 and the first and second outer diameter side ends of the resin disk portions 13 and 14 of the throttle valve 1 is formed as a resin molding die. Thus, the desired gap size can be maintained, so that the resin disk portions 13 and 14 of the throttle valve 1 are within the full rotation range (full rotation angle range) of the throttle valve 1 from the fully closed position to the fully open position. 1. The second outer diameter side end and the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 do not interfere with each other, and the throttle valve 1 does not malfunction. Further, a gap formed between the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 and the first and second outer diameter side ends of the resin disk portions 13 and 14 of the throttle valve 1 is formed as a resin molding die. Therefore, it is possible to maintain the desired gap size, so that the airtight performance when the valve is fully closed can be secured, and the amount of intake air leakage during idle operation can be reduced.
And from the current situation that the amount of fuel (for example, gasoline) used in the engine is controlled by the flow rate of the intake air, it can be said that the amount of intake air leakage during idle operation can be reduced. You will get improvements.

  FIG. 5 is a diagram showing a schematic structure of an electronically controlled throttle control device according to a second embodiment of the present invention.

  The electronically controlled throttle control device of the present embodiment has a first spring portion (hereinafter referred to as a return spring) 51 having a return spring function and a second spring portion (hereinafter referred to as a default spring) 52 having an opener spring function. Thus, a single coil spring (valve biasing means) 4 for biasing the throttle valve 1 in the fully closed direction or the fully open direction is provided. The single coil spring 4 is mounted between the outer wall surface of the bore wall portion 6 of the throttle body 5, that is, between the bottom wall surface of the gear box portion 11 and the end surface on the bore wall portion 6 side of the valve gear 16. 1 coil spring in which both ends are wound in different directions by bending the connection portion (on the way) between the first spring 52 and the default spring 52 into a substantially inverted U shape to form a U-shaped hook portion 54 held by the intermediate stopper member 53. It is structured.

  The gear box portion 11 of the throttle body 5 is provided with a boss-shaped intermediate position stopper (not shown) protruding toward the inner peripheral side. The intermediate position stopper mechanically uses the urging forces of the return spring 51 and the default spring 52 in different directions when the supply of current to the drive motor 3 is cut off due to some factor, so that the throttle valve 1 is mechanically used. An intermediate stopper member (adjustment screw with an adjusting screw function) 53 that holds or locks at a predetermined intermediate position between the fully closed position and the fully open position is screwed. Note that the outer peripheral portion of the cylindrical portion integrally formed so as to protrude from the outer wall surface of the bore wall portion 6 of the throttle body 5, that is, the bottom wall surface of the gear box portion 11, toward the right in the figure is the coil spring 4. It functions as a spring inner peripheral guide 55 that holds the inner diameter side of the coil. The outer peripheral portion of the cylindrical portion that is integrally formed so as to protrude from the side surface of the bore wall portion of the valve gear 16 toward the left in the figure is a spring inner peripheral guide 56 that holds the coil inner diameter side of the coil spring 4. Function.

Further, an opener member 57 urged from the fully closed position to the intermediate position side (fully opened direction) by the default spring 52 is integrally formed by resin molding from the side surface of the bore wall portion of the valve gear 16 of the present embodiment. . The opener member 57 includes a gear side hook (second locking portion) 61 that locks the right end portion (the other end portion) of the default spring 52 of the coil spring 4 and a connecting portion between the return spring 51 and the default spring 52. An engaging portion 62 that is detachably engaged with a U-shaped hook portion 54, and a plurality of lateral displacement preventions that restrict further movement of the U-shaped hook portion 54 in the axial direction in the vicinity of the engaging portion 62. A guide 63 is integrally formed.
A body side hook integrally formed on the outer wall surface of the bore wall portion 6 of the throttle body 5, that is, the bottom wall surface of the gear box portion 11, is shown on the left end portion (one end portion) of the return spring 51 of the coil spring 4. A spring body side hook (first locked portion) 65 that is locked or held by the (first locking portion) 64 is provided. A spring gear side hook (second locked portion) 66 that is locked or held by the gear side hook 61 of the opener member 57 is provided at the right end portion (the other end portion) of the default spring 52 of the coil spring 4 in the drawing. Is provided.

  In the electronically controlled throttle control device, the operation when the current supply to the drive motor 3 is interrupted due to some factor will be described. At this time, in a state where the opener member 57 is sandwiched between the coupling portion side end of the default spring 52 and the spring gear side hook 66, the throttle valve 1 is fully opened via the return spring function of the return spring 51, that is, the opener member 57. By an urging force that urges the throttle valve 1 to return to the intermediate position and an opener spring function of the default spring 52, that is, an urging force that urges the throttle valve 1 to return to the intermediate position from the fully closed position via the opener member 57. The engaging portion 62 of the opener member 57 comes into contact with the U-shaped hook portion 54 of the coil spring 4. As a result, the throttle valve 1 is reliably held at the intermediate position, so that the retreat travel is possible when the current supply to the drive motor 3 is interrupted due to some factor.

  FIGS. 6 to 9 show a third embodiment of the present invention. FIG. 6 shows a throttle body in which a throttle valve is opened and closed. FIGS. 7, 8A and 8B are views. FIGS. 9A and 9B are views showing a throttle valve and a throttle body injection molding method. FIGS. 9A and 9B are views showing valve side joint dimensions and body side joint dimensions.

  In this embodiment, the positions of both end portions in the rotational center axial direction (axial direction) of the resin shaft portion 15 of the throttle valve 1 are set to the rotational central axial directions (axial direction) of the resin disc portions 13 and 14 of the throttle valve 1. Ring-shaped first retracted by a predetermined axial dimension from the positions of both end portions (first and second outer diameter side end portions in the rotational center axis direction of the resin disc portions 13 and 14 of the throttle valve 1). 1. A valve side joint structure provided with second annular end faces 15a and 15b is employed. Further, the throttle valve 1 of the present embodiment has a bore wall portion 6 of the throttle body 5 on the first and second outer diameter side end portions of the substantially semicircular resin disc portions 13 and 14 in the rotation center axis direction. A valve side joint structure provided with first and second flat portions (substantially linear portions, notches) 13a, 13b, 14a, 14b extending in a direction parallel to the central axis direction is employed.

  The bore wall portion 6 of the throttle body 5 has a bore inner pipe 31 of the throttle body 5 on the bore inner diameter surface of the bore inner pipe 31 in the vicinity of the first valve bearing portion 41, that is, around the first shaft through hole 43. A first body side joint (not shown) having a first groove opening in a direction parallel to the central axis direction is insert-molded. Further, the bore wall portion 6 of the throttle body 5 has a bore inner pipe 31 of the throttle body 5 on the bore inner diameter surface of the bore inner pipe 31 in the vicinity of the second valve bearing portion 42, that is, around the second shaft through hole 44. A second body side joint 72 having a second groove 71 opened in a direction parallel to the central axis direction is insert-molded. These first and second body side joints 72 are made of a material that is not compatible or adhesive with the resin material (thermoplastic resin) forming the throttle valve 1 or the throttle body 5 (for example, metal material: brass, oilless metal). , A sliding member such as copper).

  The first and second body-side joints 72 include first and second outer diameter side end portions of the resin disk portions 13 and 14 of the throttle valve 1 and the bore inner pipe 31 of the throttle body 5 when the valve is fully closed. Flat first and second seal portions 73 for hermetic sealing with the bore inner surface of the bore, and first and second bearing sliding portions of the throttle shaft 2 in the first and second seal portions 73. The first and second shaft through holes 74 are provided to support the shaft so as to be rotatable or slidable. The first and second seal portions 73 have a predetermined gap with respect to the first and second flat portions 13a, 13b, 14a, and 14b of the resin disc portions 13 and 14 of the throttle valve 1 when the valve is fully closed. It is provided so as to face each other. The first and second shaft through holes 74 are provided corresponding to the central portion of the bore wall portion 6 in the central axis direction, that is, the portion where the annular plate-like connecting portion 33 is connected to the outer periphery of the bore inner tube 31. ing. The first and second shaft through holes 74 communicate the upstream and downstream grooves of the first and second grooves 71 in the flow direction of the intake air, and the first and second valve bearings 41, 42 has the same inner diameter as the first and second shaft through holes 43 and 44, and is provided on the same axis.

  By adopting the valve side joint structure and the body side joint structure described above, the first and second bodies are viewed from the drawing direction of the resin mold that forms the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5. Since the first and second groove portions 71 are provided in the side joint 72 at portions where the first and second outer diameter side ends of the resin disk portions 13 and 14 of the throttle valve 1 are in contact with each other, the resin of the throttle valve 1 is provided. Provide a space for the resin mold to enter between the first and second outer diameter side end portions of the disk-made disk portions 13 and 14 in the rotation center axis direction and the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5. Can do. This makes it possible to further improve the durability of the resin mold. Further, when the bore wall portion 6 of the throttle valve 1 and the throttle body 5 is integrally formed by resin molding, the first and second outer sides in the rotation center axis direction of the resin disc portions 13 and 14 of the throttle valve 1 are formed. The structure is such that the diameter side end portion and the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 are not in direct contact with each other. When the throttle valve 1 is molded with the throttle body 5 substantially simultaneously with the throttle body 5 in the same resin molding die as the throttle body 5, the throttle inner diameter surface between the throttle valve 1 and the bore inner pipe 31 of the throttle body 5 is defined. Arbitrary gaps can be formed between the resin molding dies.

Here, as shown in FIGS. 9A and 9B, the dimension in the central axis direction of the first and second shaft through holes 74 of the first and second body-side joints 72 is defined as dimension A, and The dimension in the width direction of the first and second groove portions 71 of the first and second body side joints 72 is dimension B, the diameter of the throttle shaft 2 is dimension C, and the throttle valve 1 is made of resin. The dimension in the plate thickness direction of the first and second flat portions 14a and 14b of the disk portions 13 and 14 is defined as a dimension D, and the depths of the first and second groove portions 71 of the first and second body side joints 72 are as follows. The dimension in the direction (the thickness direction of the first and second body side joints 72) is defined as dimension E.
[Equation 2]
Dimension A ≦ Dimension C
[Equation 3]
Dimension D ≦ Dimension B
[Equation 4]
0 <dimension E

  As described above, when the joint structure of this embodiment is adopted, the dimensions A to E satisfy the relational expressions of the above formulas 2 to 4, so that the resin disk portions 13 and 14 of the throttle valve 1 can be obtained. The first and second outer diameter side ends in the rotation center axis direction and the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 can be more reliably partitioned by the resin molding die. Therefore, the throttle valve 1 can be molded with the resin substantially simultaneously with the throttle body 5 in the same resin molding die as the throttle body 5, and the bore inner diameter surface of the bore inner pipe 31 of the throttle valve 1 and the throttle body 5. It is possible to form an arbitrary gap (for example, a gap having a desired dimension without deteriorating the product function such as airtight performance when the valve is fully closed) by the resin molding die.

  Further, in this embodiment, since the throttle shaft (metal shaft) 2 is insert-molded inside the resin shaft portion 15 of the throttle valve 1, the first and second of the resin disc portions 13 and 14 of the throttle valve 1 are formed. The outer diameter side end and the bore inner pipe 31 of the throttle body 5 are completely partitioned by the resin molding die and both ends of the throttle shaft 2, and in the same resin molding die as the throttle body 5, The throttle valve 1 can be molded with resin almost simultaneously with the throttle body 5. In this embodiment, the throttle shaft 2 may be made of a material (for example, ceramics) that is not compatible or adhesive with the resin material (for example, thermoplastic resin) that forms the throttle valve 1 or the throttle body 5. good. Even in this case, the same effect can be obtained. Further, the throttle shaft 2 may be formed of a substantially round bar-shaped resin shaft portion using the same resin material as the throttle valve 1.

  10 and 11 show a fourth embodiment of the present invention. FIG. 10 is a view showing a throttle body in which a throttle valve is opened and closed. FIGS. 11 (a) to 11 (c) show a valve fully closed. It is the figure which showed the movement of the throttle valve at the time.

  The electronically controlled throttle control device of the present embodiment uses the rotational power of the motor or the urging force of the coil spring 4 when the valve is fully closed, and the first outer diameter side end portion of the resin disc portion 13 of the throttle valve 1. Is in airtight contact with the first seal surface of the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 and the pressure difference between the pressure upstream of the throttle valve 1 and the pressure downstream of the intake air is utilized. The second outer diameter side end of the resin disk portion 14 of the throttle valve 1 is hermetically contacted with the second seal surface of the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5.

  In the present embodiment, when the valve is fully closed, the first outer diameter side end of the resin disc 13 of the throttle valve 1 is placed in the bore of the throttle body 5 by using the rotational power of the motor or the urging force of the coil spring 4. In the case of a naturally aspirated engine in which intake air under atmospheric pressure conditions is sucked into the cylinder by suction negative pressure generated from the cylinder, for example, after making airtight contact with the first seal surface of the bore inner diameter surface of the pipe 31. Utilizing negative pressure (intake pipe negative pressure lower than atmospheric pressure) generated downstream of the throttle valve 1 or forcibly sucking intake air pressurized above atmospheric pressure by a supercharger into the cylinder In the case of a supercharged engine to be operated, a positive pressure (supercharging pressure higher than atmospheric pressure) generated upstream of the throttle valve 1 is utilized, as shown in FIG. Of the second outer diameter side end portion of the resin disk unit 14, to generate a bending moment to the valve fully closed around the rotation center axis of the throttle valve 1.

  As shown in FIG. 11B, since the resin disc portion 14 of the throttle valve 1 is elastically deformed, the second outer diameter side end portion of the resin disc portion 14 of the throttle valve 1 is shown in FIG. As shown in c), it comes into airtight contact with the second seal surface of the bore inner diameter surface of the bore inner tube 31 of the throttle body 5 after the first outer diameter side end portion of the resin disc portion 13 of the throttle valve 1. To do. Thus, when the valve is fully closed, the resin disc portion 13 of the throttle valve 1 is brought into airtight contact with the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 before the resin disc portion 14 of the throttle valve 1. A structure can be realized. Further, when the valve is fully closed, the first and second seal surfaces of the first and second outer diameter side end portions of the resin disk portions 13 and 14 of the throttle valve 1 and the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 are provided. Can be reliably brought into contact with each other almost simultaneously, and the airtightness when the valve is fully closed can be improved. Furthermore, it is possible to reduce the influence of dimensional variations due to molding shrinkage of the resinized throttle valve 1 and throttle body 5 on the hermetic performance when the valve is fully closed.

  12 and 13 show a fifth embodiment of the present invention. FIG. 12 shows a throttle body in which a throttle valve is opened and closed. FIGS. 13 (a) and 13 (b) are views when the valve is fully opened. FIG. 5B is an explanatory view showing the fully open position of the throttle valve, and FIG. 5B is a view showing the fully closed position of the throttle valve when the valve is fully closed.

  The electronically controlled throttle control device according to the present embodiment is configured so that the first seal surface is formed so as to protrude from the bore inner diameter surface of the bore inner tube 31 of the bore wall portion 6 of the throttle body 5 toward the inner diameter side. The circumferential first protrusion 91 is provided on the intake downstream surface in the intake air flow direction. Further, the second seal surface is formed by a second semi-circular second protrusion 92 formed so as to protrude from the bore inner diameter surface of the bore inner tube 31 of the bore wall portion 6 of the throttle body 5 to the inner diameter side. It is provided on the intake upstream side in the flow direction of the intake air. The first projecting portion 91 is provided continuously on one side of the entire circumference of the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 and in the circumferential direction at substantially the same height. The second projecting portion 92 is continuously provided on the other side of the entire circumference of the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 and in the circumferential direction at substantially the same height.

Here, the height of the first and second protrusions 91 and 92 is h, the radial dimension of the resin disk portions 13 and 14 of the throttle valve 1 is Rv, the bore radius of the bore inner tube 31 is Rb, When the valve angle when closed is θ, the maximum molding shrinkage (%) of the molding resin of the throttle valve 1 is Sv, and the maximum molding shrinkage (%) of the molding resin of the throttle body 5 is Sb, The protrusion structure is such that the height (h) of the second protrusions 91 and 92 satisfies the following formula (5). [Equation 5]
h> Rb × (100−Sb) −Rv × cos θ × (100−Sv)

Further, when the dimension in the thickness direction (plate thickness direction) of the resin disc portions 13 and 14 of the throttle valve 1 is t and the dimension in the radial direction of the resin disc portions 13 and 14 of the throttle valve 1 is Rv, A valve (disk) structure in which the dimension (t) in the thickness direction (plate thickness direction) of the resin disk portions 13 and 14 of the throttle valve 1 that can reduce dimensional variations due to molding shrinkage satisfies the following equation 6: To do.
[Equation 6]
t <Rv

  Here, in the prior art, as shown in FIGS. 17 and 18, the first and second outer diameter side ends of the first and second disk portions 111 and 112 having a substantially semicircular shape of the throttle valve 102. And a gap formed between the first and second seal surfaces of the substantially semicircular shape of the bore inner diameter surface of the bore inner tube 106 of the bore wall portion 105 of the throttle body 101, when the valve is fully closed. Airtight performance was secured. In contrast to this conventional technique, in the present embodiment, the first outer diameter side end of the resin disc portion 13 of the throttle valve 1 is the first protrusion of the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5. After the airtight contact with the first seal surface provided at 91, the end surface of the second outer diameter side end portion of the resin disk portion 14 of the throttle valve 1 and the bore inner diameter surface of the bore inner pipe 31 of the throttle body 5 are shown. A gap formed between the second seal surface provided on the second protrusion 92, the end surface of the second outer diameter side end of the resin disc portion 14 of the throttle valve 1, and the bore inner pipe 31 of the throttle body 5. The rotation center axis of the throttle valve 1 is placed on the second outer diameter side end of the resin disk portion 14 of the throttle valve 1 due to pressure loss due to two gaps between the inner diameter surface of the bore and the bore. To central valve fully closed side Bending moment is generated. As a result, the second outer diameter side end of the resin disc portion 14 of the throttle valve 1 is elastically deformed, so that the second outer diameter side end of the resin disc portion 14 of the throttle valve 1 is It comes into airtight contact with the second seal surface provided on the second protrusion 92 on the bore inner diameter surface of the bore inner tube 31. Therefore, since the airtight performance when the valve is fully closed can be ensured, the effects of dimensional variations due to molding shrinkage of the resinized throttle valve 1 and throttle body 5 on the airtight performance when the valve is fully closed are described in Examples 1-4. Compared to the above, it can be further reduced.

[Modification]
In this embodiment, an example in which a Hall element is used as a non-contact type detection element has been described. However, a Hall IC or a magnetoresistive element may be used as the non-contact type detection element. In the present embodiment, the example in which the split permanent magnet 10 is employed as the magnetic field generation source has been described. However, a cylindrical permanent magnet may be employed as the magnetic field generation source. In this embodiment, the throttle valve (resin valve) 1 is constituted by the resin disk portions (disk-like portions) 13 and 14 and the resin shaft portion (cylindrical portion) 15, and the throttle shaft is made of only a metal material. (Metal shaft) 2 is configured, but the throttle valve 1 is configured by the resin disk portions 13 and 14, and the substantially cylindrical resin shaft portion (cylindrical portion) and the central shaft round metal shaft portion are formed. The throttle shaft 2 may be configured as described above. In the first to fifth embodiments, a metal shaft is used as the throttle shaft 2, but a resin shaft may be used as the throttle shaft 2. In this case, since the resin shaft portion 15 of the throttle valve 1 is integrally formed by resin molding, the number of parts is reduced.

  In the present embodiment, the present invention transmits the rotational power of the drive motor (actuator) 3 to the throttle shaft 2 via a power transmission device such as a gear reduction device, so that the rotational angle (valve opening) of the throttle valve 1 is determined. Although an example in which the present invention is applied to an electronically controlled throttle control device that controls in accordance with an accelerator operation amount of a driver (driver) has been described, the present invention may be applied to a throttle device for an internal combustion engine that does not have a drive motor 3. . In this case, instead of the valve gear 16 provided at the other end of the throttle shaft 2, a lever portion that is mechanically connected to the accelerator pedal via a wire cable is provided. Even in this case, the accelerator operation amount of the driver (driver) can be transmitted to the throttle valve 1 and the throttle shaft 2.

  The biting property (coupling performance) between the inner periphery of the resin shaft portion 15 of the throttle valve 1 and the outer periphery of the valve holding portion of the throttle shaft 2 is improved, and the shaft of the throttle valve 1 with respect to the throttle shaft 2 is improved. In order to prevent relative movement in the direction, that is, in order to prevent the throttle valve 1 from coming off from the valve holding portion of the throttle shaft 2, a part or all of the outer peripheral surface of the valve holding portion of the throttle shaft 2 is knurled. May be applied. For example, a notch or a concavo-convex portion may be formed in part or all of the outer peripheral surface of the valve holding portion of the throttle shaft 2. Alternatively, the cross-sectional shape of the valve holding portion of the throttle shaft 2 may be a substantially circular shape having a two-sided width, and the cross-sectional shape of the resin shaft portion 15 of the throttle valve 1 may be a substantially cylindrical shape having a two-sided width. This can prevent relative rotational movement of the throttle valve 1 and the throttle shaft 2 in the rotational direction.

  In this embodiment, the bore wall portion 6 of the throttle body 5 is arranged with a circular tube-shaped bore inner tube 31 in a circular tube-shaped bore outer tube 32, and the bore inner tube 31 and the bore outer tube 32 are concentric. However, the axial center of the bore inner tube 31 with respect to the axial center of the bore outer tube 32 is arranged on one side in the radial direction perpendicular to the central axis direction of the bore wall 6 (for example, the ground side in the vertical direction). ) May be formed in a double tube structure eccentric. In addition, the bore wall portion 6 of the throttle body 5 is arranged with a circular tube-shaped bore inner tube 31 in the circular tube-shaped bore outer tube 32, and the bore inner tube 31 is arranged with respect to the axial center of the bore outer tube 32. The shaft center may be formed in a double tube structure that is eccentric to the other side in the radial direction orthogonal to the central axis direction of the bore wall 6 (for example, the top side in the top-to-bottom direction). Further, the bore wall 6 of the throttle body 5 may have a single tube structure.

  In this embodiment, without introducing engine cooling water into the throttle body 5, the upstream side and the downstream side of the throttle valve 1 are used for the purpose of preventing the icing of the throttle valve 1 during cold weather such as winter and reducing the number of parts. Blocking recesses 34 and 35 for blocking water flowing into the bore wall 6 from the side are provided, but at least the bore wall along the inner peripheral surface of the intake pipe upstream from the throttle valve 1 Only the blocking recess 34 for blocking the moisture flowing into the portion 6 may be provided. An idle speed control for providing a bypass passage that bypasses the throttle valve 1 in the outer peripheral portion of the bore outer pipe 32 and further controlling the engine idle speed by adjusting the amount of air flowing in the bypass passage. A valve (ISC valve) may be attached. Further, an outlet hole of the blow-by gas reduction device (PCV) or a purge tube of the transpiration prevention device may be attached to the intake pipe upstream of the bore wall 6 of the throttle body 5 in the flow direction of the intake air. . In this case, the engine oil contained in the blow-by gas may be deposited on the inner wall surface of the intake pipe in the intake pipe. For this reason, it is possible to prevent malfunction of the throttle valve 1 and the throttle shaft 2 by blocking foreign matter such as oil mist and deposit transmitted from the inner wall surface of the intake pipe in the blocking recess 34.

  As a material for molding the resin disc portion 13, the resin disc portion 14 and the resin shaft portion 15 of the throttle valve 1, a filler is added to a heated and molten resin material (for example, a molten resin made of a thermoplastic resin). A resin-based composite material (for example, low-cost glass fiber, carbon fiber, aramid fiber, boron fiber, or the like) may be used (for example, polybutylene terephthalate containing 30% glass fiber: PBTG30). Further, as a material for forming the bore wall portion 6 and the motor housing portion 7 of the throttle body 5, a resin material that is heated and melted (for example, a molten resin made of a thermoplastic resin) and a filler (for example, low-cost glass fiber, Alternatively, a resin composite material (for example, polybutylene terephthalate: PBTG30 containing 30% glass fiber) in which carbon fiber, aramid fiber, boron fiber, or the like) is mixed may be used.

  Further, by injecting the resin-based composite material from the valve gate or the body gate into the valve cavity or the body cavity of the resin molding die, the resin throttle valve and the resin throttle body are formed by injection molding of the resin-based composite material. May be manufactured. In this way, a resin molded product molded by injection molding of a resin-based composite material is low in cost and excellent in resin moldability, and improved in performance such as mechanical properties, strength, rigidity, and heat resistance. . Further, a body cavity having a shape corresponding to the product shape of the throttle body and a valve cavity having a shape corresponding to the product shape of the throttle valve may be formed in the resin mold. It should be noted that when one or more body gates and valve gates are used to mold the throttle valve at the same time as the throttle body in the same resin molding die as the throttle body, the body cavity and valve of the resin molding die are used. The injection of the heated and molten resin material into the cavity may be performed at the same time or after the resin mold has been clamped until the mold is opened. Further, a plurality of injections may be performed at any time during the injection / filling step or the pressure holding step.

1 is a perspective view showing the overall structure of an electronically controlled throttle control device (Example 1). FIG. (Example 1) which is the front view which showed each component parts, such as a drive motor comprised in the gear box part integrally formed in the outer wall surface of a throttle body, and a gear reduction gear. (Example 1) which is the explanatory view which showed the bore wall part of the double pipe structure of a throttle body. (A) is explanatory drawing which showed the fully open position of the throttle valve at the time of valve full open, (b) is explanatory drawing which showed the fully closed position of the throttle valve at the time of valve full close (Example 1). (Example 2) which is the perspective view which showed schematic structure of the electronically controlled throttle control apparatus. (Example 4) which is the perspective view which showed the throttle body which accommodated the throttle valve so that opening and closing was possible. (Example 3) which is the perspective view which showed the injection molding method of a throttle valve and a throttle body. (A), (b) is explanatory drawing which showed the injection molding method of a throttle valve and a throttle body (Example 3). (A), (b) is explanatory drawing which showed the valve side joint dimension and the body side joint dimension (Example 3). (Example 4) which is the perspective view which showed the throttle body which accommodated the throttle valve so that opening and closing was possible. (A)-(c) is explanatory drawing which showed the motion of the throttle valve at the time of a valve fully closed (Example 4). (Example 5) which is the perspective view which showed the throttle body which accommodated the throttle valve so that opening and closing was possible. (A) is explanatory drawing which showed the fully open position of the throttle valve at the time of valve full open, (b) is explanatory drawing which showed the fully closed position of the throttle valve at the time of valve full close (Example 5). It is the perspective view which showed the whole structure of the electronically controlled throttle control apparatus (conventional technique). It is the perspective view which showed the throttle body which accommodated the throttle valve so that opening and closing was possible (prior art). It is the perspective view which showed the throttle body which accommodated the throttle valve so that opening and closing was possible (comparative example). It is the perspective view which showed the throttle body which accommodated the throttle valve so that opening and closing was possible (prior art). (A) is explanatory drawing which showed the fully open position of the throttle valve at the time of valve full open, (b) is explanatory drawing which showed the fully closed position of the throttle valve at the time of valve full close (prior art).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Throttle valve 2 Throttle shaft 3 Drive motor 4 Coil spring 5 Throttle body 6 Bore wall part 7 Motor housing part 9 Flat connection part 13 Resin disk part (1st disk part)
14 Resin disk part (second disk part)
15 Resin shaft (cylindrical part)
31 Bore inner pipe 32 Bore outer pipe 72 Second body side joint 91 First protrusion 92 Second protrusion 13a, 14a First flat part 13b, 14b Second flat part

Claims (12)

A substantially cylindrical throttle body in which intake air taken into the internal combustion engine flows in the direction of the central axis, and a substantially disc-shaped throttle valve having a rotation center axis in a direction substantially perpendicular to the central axis direction of the throttle body; With
The throttle body is made of a resin material,
The throttle valve is made of a resin material,
A throttle device for an internal combustion engine, wherein a valve angle of the throttle valve when the valve is fully closed is set to be less than 90 ° with respect to a central axis direction of the throttle body,
The throttle valve has a substantially semi-disc-shaped first disk portion located downstream of the intake air in the intake air flow direction when the valve is fully closed or fully opened, and the intake air flow direction when the valve is fully closed or when the valve is fully open Having a substantially semicircular disk-shaped second disk portion located on the intake upstream side of
A throttle device for an internal combustion engine, comprising: a structure in which the first disk portion is in airtight contact with the bore inner surface of the throttle body before the second disk portion when the valve is fully closed. The throttle device for an internal combustion engine according to claim 1,
In the throttle valve, the first disk part, the second disk part and the cylindrical part are integrally formed by resin molding,
A throttle device for an internal combustion engine, wherein a substantially central reinforcing member or a metal shaft is insert-molded inside the cylindrical portion. The throttle device for an internal combustion engine according to claim 1 or 2,
A throttle shaft that rotates integrally with the throttle valve;
An internal combustion engine comprising: a motor as a drive source; and a power unit including a power transmission device that transmits rotational power of the motor to the throttle shaft that rotates integrally with the throttle valve. Throttle device for engine. The throttle device for an internal combustion engine according to claim 3,
The throttle body includes a substantially cylindrical bore wall portion that accommodates the throttle valve in an openable / closable manner, a substantially cylindrical motor housing portion that accommodates the motor, and the bore wall portion and the motor housing portion. The connecting part to be connected is integrally formed by resin molding,
The throttle shaft has an axial direction set so as to be in a direction substantially perpendicular to the central axis direction of the bore wall portion and parallel to the central axis direction of the motor housing portion. A throttle device for an internal combustion engine. The throttle device for an internal combustion engine according to claim 3 or 4,
When the valve is fully closed, the throttle disk uses the rotational power of the motor or the biasing force of the spring to bring the first disk portion into airtight contact with the bore inner surface of the throttle body, and from the throttle valve Also, a method is adopted in which a pressure difference between the pressure on the intake upstream side and the pressure on the intake downstream side is used to bring the second disk portion into airtight contact with the bore inner surface of the throttle body. A throttle device for an internal combustion engine. The throttle device for an internal combustion engine according to claim 5,
The internal combustion engine is a naturally aspirated engine in which intake air under atmospheric pressure is sucked into the cylinder by negative suction pressure generated from the cylinder, or intake air pressurized to higher than atmospheric pressure by a supercharger A throttle device for an internal combustion engine, characterized by being a supercharged engine that forcibly sucks the gas into a cylinder. The throttle device for an internal combustion engine according to any one of claims 1 to 6,
When the valve is fully closed, the first disk portion has a substantially semicircular first shape that hermetically contacts a substantially semicircular first seal surface on one side of the entire circumference of the bore inner diameter surface of the throttle body. 1 has an outer diameter side end,
When the valve is fully closed, the second disk portion has a substantially semicircular second shape that hermetically contacts the other semicircular second seal surface on the other side of the entire circumference of the bore inner diameter surface of the throttle body. 2. A throttle device for an internal combustion engine having an outer diameter side end. The throttle device for an internal combustion engine according to claim 7,
The first seal surface is provided on the intake downstream surface in the intake air flow direction of a substantially semicircular first protrusion formed so as to protrude from the bore inner surface of the throttle body to the inner diameter side. ,
The second seal surface is provided on the intake upstream side surface in the intake air flow direction of a substantially semicircular second protrusion formed so as to protrude from the bore inner surface of the throttle body toward the inner diameter side. A throttle device for an internal combustion engine. The throttle device for an internal combustion engine according to claim 8,
The first protrusion is continuously provided on one side of the entire circumference of the bore inner diameter surface of the throttle body, and is provided in the circumferential direction at substantially the same height.
The second projecting portion is continuously provided on the other side of the entire circumference of the bore inner diameter surface of the throttle body, and is provided in the circumferential direction at substantially the same height. Throttle device. The throttle device for an internal combustion engine according to any one of claims 7 to 9,
At the first and second outer diameter side ends in the rotation center axis direction of the first and second disk portions, grooves, flat portions, or substantially linear portions in a direction parallel to the center axis direction of the throttle body A throttle device for an internal combustion engine is provided. The throttle device for an internal combustion engine according to any one of claims 7 to 10,
In the throttle body, when the valve is fully closed, the first and second outer diameter side ends of the first and second disk portions in the rotation center axis direction and the bore inner diameter surface of the throttle body are hermetically sealed. The body side joints are insert molded or integrally formed,
The throttle device for an internal combustion engine, wherein the body side joint is made of a material that is not compatible or adhesive with the resin material forming the throttle body or the throttle valve. The throttle device for an internal combustion engine according to any one of claims 1 to 11,
The throttle valve has dimensions t in the thickness direction of the first and second disk portions,
When the radial dimension of the first and second disk parts is Rv,
t <Rv
A throttle device for an internal combustion engine characterized by satisfying the relationship:

Images