JP2011196192A - Intake control device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake control device for an engine, certainly performing abutment and retainment between a flange on the side of a throttle body and a flange on the side of a manifold without producing distortion of a throttle body caused by a molded resin shrinkage cavity.SOLUTION: The throttle body 1 and a control housing 3 are integrally connected to each other through an integrally connecting section 4 positioned on the periphery of the throttle body 1, a plurality of fastening bosses 12a, 12b, 12c fastened to the flange 41 on the side of the manifold by fastening members 43, 44 are formed in the control housing 3 while avoiding the integrally connecting section 4, and a space 14 is formed in each zone with these fastening bosses 12a, 12b, 12c and throttle body 1 connected to each other at the shortest distance. When the control housing 3 is formed, the molded resin shrinkage cavity generated around each of the fastening bosses is absorbed by the space 14.

Description

  In the present invention, a throttle body having an intake passage and a control housing adjacent thereto are integrally formed of synthetic resin, and a throttle valve for opening and closing the intake passage is attached to a valve shaft rotatably supported by the throttle body. The control housing accommodates an electric motor and a reduction gear device that decelerates the rotation of the electric motor and transmits it to the valve shaft. A throttle body side flange formed at the downstream end of the throttle body This is related to an improvement in an intake control device for an engine, which is disposed opposite to a manifold side flange formed in an intake pipe of an intake manifold of an engine.

  In recent years, in order to reduce the weight of such an intake control device for an engine, a throttle body having an intake passage and a control housing adjacent thereto are integrally formed of a synthetic resin. (See Patent Document 1 below).

Japanese Patent Laid-Open No. 11-107869

  By the way, in the conventional one, a plurality of fastening bosses for fastening the throttle body side flange to the manifold side flange are formed. Therefore, in the throttle body side flange, the portion where the fastening boss exists and The thickness in the radial direction differs greatly from the non-existing part, and this may cause distortion in the throttle body due to molding resin shrinkage when molding the throttle body and control housing with synthetic resin. Such a distortion is undesirable because it causes variations in the intake air amount of the throttle valve, particularly at the idle opening, and increases the opening / closing resistance of the throttle valve.

  The present invention has been made in view of such circumstances, so that the contact between the throttle body side flange and the manifold side flange can be reliably maintained without causing distortion of the throttle body due to shrinkage of the molding resin. An object of the present invention is to provide an intake control device for an engine.

  To achieve the above object, according to the present invention, a throttle body having an intake passage and a control housing adjacent to the throttle body are integrally formed of a synthetic resin, and the intake shaft is mounted on a valve shaft rotatably supported by the throttle body. A throttle valve for opening and closing the passage is attached, and the control housing accommodates an electric motor and a reduction gear device for reducing the rotation of the electric motor and transmitting it to the valve shaft. In the intake control device for an engine, in which the throttle body side flange formed in the engine is disposed opposite to the manifold side flange formed in the intake intake pipe of the intake manifold of the engine, the throttle body and the control housing are provided with The control housing is integrally connected via an integrated connecting portion located on the outer periphery, and the integrated connecting portion is avoided. A grayed, the manifold flange to form a plurality of fastening bosses that are fastened by a fastening member, the first characterized in that these fastening bosses and the throttle body provided with a space section which connects with the shortest distance. The fastening members correspond to bolts 43 and nuts 44 in the embodiments of the present invention described later.

  In addition to the first feature of the present invention, as the fastening boss, the first and second fastening bosses arranged across the valve shaft, and a straight line connecting the centers of the first and second fastening bosses, A second feature is that a third fastening boss located near the center of gravity of the throttle body and the control housing on which the throttle valve, the electric motor, and the reduction gear device are mounted is formed on the control housing.

  Further, according to the present invention, a throttle body having an intake passage and a control housing adjacent thereto are integrally formed of synthetic resin, and a throttle valve for opening and closing the intake passage is provided on a valve shaft rotatably supported by the throttle body. The control housing accommodates an electric motor and a reduction gear device that decelerates the rotation of the electric motor and transmits it to the valve shaft, and is formed on the throttle body side formed at the downstream end of the throttle body. In an engine intake control device in which a flange is arranged opposite to a manifold side flange formed in an intake pipe of an intake manifold of an engine, at least three pieces are fastened to the control housing by a fastening member to the manifold side flange. Of the fastening bolts, and the first and second of the fastening bolts lined up across the valve shaft A straight line connecting the connecting bosses between the centers thereof passes between the center of the intake passage and the total center of gravity of the throttle body and the control housing on which the throttle valve 9, the electric motor and the reduction gear device are mounted. The arrangement is the third feature.

  Furthermore, in addition to the third feature of the present invention, the fourth feature is that the remaining third fastening boss of the three fastening bolts is disposed closer to the overall center of gravity from the straight line.

  Furthermore, in addition to the fourth feature, the fifth feature of the present invention is that the three fastening bosses are arranged so as to surround the overall center of gravity.

  Furthermore, in addition to any one of the third to fifth features, the present invention integrally connects the throttle body and the control housing via an integral connecting portion located on the outer periphery of the throttle body. A sixth feature is that the first to third fastening bosses are formed in the control housing while avoiding a portion, and a space is provided in a section connecting the first to third fastening bosses and the throttle body at the shortest distance. And

  In addition to any one of the second, fourth to sixth features, the present invention provides a resultant force position of the fastening force of the first, second, and third fastening bosses on the manifold side flange, and the total center of gravity. The seventh feature is that the positions of the two substantially coincide with each other.

  Furthermore, according to the present invention, in addition to any one of the first to seventh features, an eighth aspect is that an elastic fastening means for elastically fastening these is provided between the manifold side flange and the throttle body side flange. It is characterized by.

  Furthermore, in addition to the eighth feature, the present invention is characterized in that the elastic fastening means is formed on the throttle body side flange, which is formed on the nail portion thinner than the flange, and on the manifold side flange. The ninth feature is that it is configured with a snap-fit portion that elastically engages with the snap fit portion.

  Furthermore, the present invention is characterized in that, in addition to the eighth feature, the elastic fastening means is constituted by an elastic clip that elastically clamps between the manifold side flange and the throttle body side flange.

  Furthermore, in addition to any of the first, second, sixth, and seventh features, the present invention provides the integral connecting portion that protrudes from the outer peripheral surface of the throttle body so that the valve shaft is interposed through a bearing. The eleventh feature is that the bearing boss is supported.

  According to the first feature of the present invention, it becomes possible to make the outer shape of the flange on the throttle body side the same shape as the cross-sectional shape of the intake passage. It is possible to suppress the occurrence of distortion of the throttle body. Moreover, a plurality of fastening bosses are formed in the control housing while avoiding the integral connection between the throttle body and the control housing, and a space is provided in the section connecting these fastening bosses and the throttle body with the shortest distance. Even if molding resin shrinkage occurs around the fastening boss, the shrinkage is absorbed by the space and does not spread to the throttle body, so that the throttle body can be maintained in a normal state without distortion.

  As described above, it is possible to prevent variations in the intake air amount when the throttle valve is idling, and to smoothly open and close the throttle valve by avoiding an increase in rotational resistance of the valve shaft.

  Further, even if the fastening boss is vibrated by the vibration of the engine and distortion occurs around the fastening boss, the distortion is also absorbed into the space, so that the distortion of the throttle body due to the vibration can be prevented.

  According to the second feature of the present invention, the distance between the position of the resultant force of the fastening force with respect to the manifold side flange of the first to third fastening bosses and the position of the total center of gravity is shortened, and the moment generated therebetween is reduced. Accordingly, the distortion of the control housing and the throttle body due to the moment can be prevented.

  According to the third to fifth features of the present invention, the distance between the position of the resultant force of the fastening force with respect to the manifold side flange of at least three fastening bosses and the position of the total center of gravity is shortened, and the moment generated therebetween Thus, the distortion of the control housing and the throttle body due to the moment can be prevented.

  According to the sixth aspect of the present invention, since a space is provided in a section connecting each fastening boss and the throttle body with the shortest distance, when the control housing is molded, molding resin is drawn around the fastening boss. However, the shrinkage is absorbed by the space, and does not affect the throttle body, so that the throttle body can be maintained in a normal state without distortion.

  According to the seventh feature of the present invention, the occurrence of the moment can be suppressed and the distortion of the control housing and the throttle body can be surely prevented by substantially matching the position of the resultant force point and the position of the total center of gravity. .

  According to the eighth aspect of the present invention, since the throttle body side flange and the manifold side flange are elastically fastened by the elastic fastening means, the fastening force between the throttle body side flange and the manifold side flange can be strengthened. . In addition, even if there is a slight manufacturing error between the elastic fastening means and the fastening boss, the elastic fastening means can absorb the manufacturing error by elastic deformation of the elastic portion, thus preventing distortion of the throttle body. be able to.

  According to the ninth aspect of the present invention, the fastening force between the throttle body side flange and the manifold side flange can be strengthened. In addition, even if there are some manufacturing errors between the claw and snap fit parts and the fastening boss, the above manufacturing errors can be absorbed by the elastic deformation of the snap fit parts, and the distortion of the throttle body can be prevented. . Further, the engagement state of the claw portion and the snap fit portion is firmly held by the fastening of the fastening boss to the manifold side flange, and there is no fear of loosening. Further, since the claw portion is thinner than the flange on the throttle body side, it does not become a factor that causes the throttle body to contract when the throttle body is molded.

  According to the tenth feature of the present invention, the fastening force between the throttle body side flange and the manifold side flange can be enhanced by using the elastic clip. In addition, even if there are some manufacturing errors between the claw portion and the snap fit portion and the fastening boss, the manufacturing errors can be absorbed by the elastic deformation of the elastic clip, and the distortion of the throttle body can be prevented. In addition, the outer shape of the flange on the throttle body side can be matched to the cross-sectional shape of the intake passage, and therefore, when the throttle body is molded, it is possible to reliably prevent the distortion of the throttle body due to the shrinkage of the molded resin.

  According to the eleventh feature of the present invention, since the bearing boss of the throttle body is an integral connection portion between the throttle body and the control housing, there is no need to form a dedicated integral connection portion on the outer peripheral surface of the throttle body, The structure can be simplified.

1 is a front view of an engine intake control device according to an embodiment of the present invention. The cross-sectional front view of the same apparatus. FIG. 3 is an exploded perspective view of a throttle body, a control housing, and an intake manifold in the same device. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 in FIG. FIG. 5 is a view corresponding to FIG. 4 showing another embodiment of the present invention.

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

  1 to 3, an intake control device for an engine mounted on a vehicle such as a motorcycle or an automobile includes a synthetic resin throttle body 1 having an intake passage 2 at the center thereof, and a composite integrally connected thereto. The control housing 3 made of resin is mainly used.

  As clearly shown in FIG. 2, the throttle body 1 integrally has a pair of bearing bosses 4, 4 on the left and right side walls thereof, and at the downstream end of the intake passage 2 of the throttle body 1, A circular throttle body side flange 5 whose outer shape is basically the same as the cross-sectional shape of the intake passage 2 is integrally formed.

  A pair of left and right ball bearings 7 and 7 for rotatably supporting a valve shaft 6 traversing the intake passage 2 are attached to the bearing bosses 4 and 4. A throttle valve for opening and closing the intake passage 2 is attached to the valve shaft 6. 9 is fixed. One bearing boss 4 is fitted with a ball bearing 7 on the same side and a cap 10 that covers one end surface of the valve shaft 6, and the other end of the valve shaft 6 extends into the control housing 3. .

  1 to 3 again, the control housing 3 is integrally connected to the one bearing boss 4, and apart from the bearing boss 4, the control housing 3 is separated from the throttle body 1. The control housing 3 is orthogonal to the valve shaft 6 from one end of the motor housing portion 3a in the axial direction, and a cylindrical motor housing portion 3a disposed in parallel with the valve shaft 6 on one side of the throttle body 1. A flat gear housing portion 3b extending in the direction and continuing to the one bearing boss 4 is formed on the surface opposite to the throttle body 1 of the gear housing portion 3b. The motor accommodating portion 3a accommodates the electric motor 20, and the gear accommodating portion 3b accommodates a reduction gear device 21 that decelerates the rotation of the electric motor 20 and transmits it to the valve shaft 6. A synthetic resin cover 22 covering the device 21 is joined to the open surface of the control housing 3 by screws 23.

  The reduction gear device 21 includes a primary drive gear 26 fixed to the output shaft 25 of the electric motor 20, a primary driven gear 26 ′ rotatably supported on the intermediate shaft 27 and meshed with the primary drive gear 26, A secondary drive gear 28 integrally formed on one side of the primary driven gear 26 ′, and a sector type secondary driven gear 28 ′ fixed to the valve shaft 6 by a nut 29 and meshing with the secondary drive gear 28. The rotation of the output shaft 25 of the electric motor 20 is decelerated in two steps and transmitted to the valve shaft 6 so that the throttle valve 9 can be opened and closed. Each gear of the reduction gear device 21 is a spur gear, and the valve shaft 6, the output shaft 25, and the intermediate shaft 27 are arranged so that their axes are arranged in parallel to each other. The intermediate shaft 27 is supported by a cylindrical support boss 30 formed integrally with the control housing 3, and the other end is inserted into an insertion hole 31 provided in the cover 22. The secondary driven gear 28 ′ is connected to a closing spring 32 made of a torsion coil spring that urges the secondary driven gear 28 ′ in the closing direction of the throttle valve 9.

  A throttle opening sensor 33 for detecting the opening of the throttle valve 9 is provided between the valve shaft 6 of the throttle valve 9 and the housing cover 22. The throttle opening sensor 33 is a known sensor that takes out the opening of the throttle valve 9 as an electrical signal. The throttle opening sensor 33 is attached to the end of a socket-type nut 29 that fixes the secondary driven gear 28 'to the valve shaft 6. And a receiver 35 attached to the cover 22 so as to face the transmitter 34.

  1 and 2, the control housing 3 includes three fastening bosses, i.e., first to third, which are arranged on the outer side in the radial direction of the flange 5 on the throttle body with their respective axes parallel to the intake passage 2. The fastening bosses 12a to 12c are integrally formed. At this time, the first fastening boss 12a is formed at the outer end portion of the motor housing portion 3a, and the second fastening boss 12b is formed at the outer end portion of the gear housing portion 3b, whereby the first and second fastening bosses 12a, 12b are formed. Are arranged so as to sandwich the valve shaft 6. The third fastening boss 12c is formed from the straight line L connecting the centers of the first and second fastening bosses 12a and 12b, and the throttle body 1 and the control housing 3 on which the throttle valve 9, the electric motor 20, and the reduction gear device 21 are mounted. It is formed integrally with the control housing 3 so as to be disposed near the position of the center of gravity G.

  Specifically, the first and second fastening bosses 12a and 12b arranged across the valve shaft 6 are arranged such that a straight line L connecting the centers thereof passes between the center of the intake passage 2 and the total center of gravity G. Be placed. The first to third fastening bosses 12a, 12b, and 12c are disposed so as to surround the overall center of gravity G.

  A metal collar 13 is integrally embedded in the center of each fastening boss 12a to 12c by insert molding or heat insert molding.

  Thus, the space 14 is provided in the section connecting the first to third fastening bosses 12a to 12c and the throttle body 1 with the shortest distance.

  On the other hand, as shown in FIGS. 3 and 4, a manifold side flange 41 facing the throttle body side flange 5 is integrally formed at the upstream end portion of the intake air intake pipe 40 in the intake manifold of the engine. The manifold side flange 41 is integrally formed with first to third support bosses 42a to 42c facing the first to third fastening bosses 12a to 12c. A nut 44 is integrally embedded in each central portion of the first to third support bosses 42a to 42c by insert molding or heat insert molding. Thus, the first to third fastening bosses 12a to 12c are screwed and fastened to the nuts 44 of the first to third support bosses 42a to 42c by tightening the bolts 43 inserted through the collar 13 into the first to third fastening bosses 12a to 12c. 3 fastened to the support bosses 42a to 42c.

  In FIG. 1, symbol G indicates the position of the total center of gravity of the throttle body 1 and the control housing 3 on which the throttle valve 9, the electric motor 20 and the reduction gear device 21 are mounted. The first to third fastening bosses 12a to 12c Are arranged such that the position of the resultant force F of the fastening force when bolted to the first to third support bosses 42a to 42c substantially coincides with the position of the total center of gravity G.

  A positioning cylinder 46 is formed integrally with the downstream end of the throttle body 1 so as to be concentric with the intake passage 2 and project from the throttle body flange 5 toward the intake air intake pipe 40. The positioning cylinder 46 is fitted into the positioning cylinder 46. A positioning hole 47 is formed in the inner peripheral surface of the upstream end portion of the intake air introduction pipe 40, and an O-ring 48 as an annular elastic seal member is mounted on the outer periphery of the base of the positioning cylinder portion 46. An annular seal housing 49 is formed at the upstream end of the intake pipe 40 so as to be continuous with the open end of the positioning hole 47.

  Accordingly, the coaxial arrangement of the throttle body 1 and the intake pipe 40 is ensured by the fitting of the positioning cylinder portion 46 and the positioning hole 47, and the throttle body side flange 5 around the intake passage 2 and the O-ring 48 are provided. Airtightness between the manifold side flanges 41 is ensured. The outer shape of the throttle body side flange 5 has a circular shape similar to the cross-sectional shape of the intake passage 2, so that the radial thickness of the throttle body side flange 5 is almost uniform over the entire circumference. When molding the throttle body 1 with resin, it is possible to suppress the occurrence of distortion of the throttle body 1 due to shrinkage of the molding resin.

  On the other hand, the integral connection between the throttle body 1 and the control housing 3 is only one bearing boss 4, and the first to third fastening bosses 12 a to 12 c formed on the control housing 3 and the throttle body 1 are connected to each other. Since the space 14 is provided in the section connected by the shortest distance, even if molding resin is contracted around the first to third fastening bosses 12a to 12c when the control housing 3 is molded, the contraction is not generated in the space 14. Absorbed, there is no spillover to the throttle body 1, and the inner peripheral surface of the throttle body 1, particularly the intake passage 2, can be maintained in a normal state without distortion. As a result, it is possible to prevent variation in the intake air amount when the throttle valve 9 is at an idle opening, and to avoid an increase in rotational resistance of the valve shaft 6 and to smoothly open and close the throttle valve 9.

  Further, even if the first to third fastening bosses 12a to 12c are vibrated by the vibration of the engine and distortion occurs around the first to third fastening bosses 12a to 12c, the distortion is also absorbed into the space 14. , Distortion of the throttle body 1 due to the vibration can be prevented.

  Further, the first and second fastening bosses 12a and 12b are arranged so as to sandwich the valve shaft 6, and the third fastening boss 12c is formed from a straight line L connecting the centers of the first and second fastening bosses 12a and 12b. Since the throttle body 1, on which the throttle valve 9, the electric motor 20, and the reduction gear device 21 are mounted, and the manifold side flange 41 are disposed near the overall center of gravity G, the first to third fastening bosses 12a to 12c have first to third. The distance between the position of the resultant force F of the fastening force with respect to the support bosses 42a to 42c and the position of the total center of gravity G can be shortened, and the moment generated therebetween can be reduced. Generation of distortion of the throttle body 1 can be prevented.

  At this time, as shown in the example, if the position of the resultant force F and the position of the total center of gravity G are substantially coincided with each other, the generation of the moment is suppressed and the distortion of the control housing 3 and the throttle body 1 due to vibration is suppressed. It can be surely prevented.

  Next, as shown in FIGS. 2, 4 and 5, an elastic fastening means 50 is provided between the throttle body side flange 5 and the manifold side flange 41 for elastically fastening them.

  The elastic fastening means 50 is formed integrally with the outer peripheral surface of the throttle body side flange 5 at equal intervals and protrudes in the radial direction, and is integrally formed with the manifold side flange 41 so as to form the claw portion 51. And a plurality of hook-shaped snap-fit portions 52 made of synthetic resin that are elastically engaged with each other. The claw portion 51 is formed thinner than the throttle body side flange 5 so as not to cause distortion in the throttle body side flange 5 due to shrinkage at the time of molding, and on the side surface of the flange 5 upstream of the intake passage 2, A constant gradient is given along the circumferential direction of the flange 5. That is, the claw portion 51 is formed such that its thickness varies along the circumferential direction of the throttle body side flange 5 so as to form a wedge shape.

  Thus, before the first to third fastening bosses 12a to 12c are fastened to the first to third support bosses 42a to 42c, the claw portion 51 is moved from the thin portion to the snap fit portion 52. If the claw portion 51 is inserted and rotated, the thickened portion of the claw portion 51 enters the flange portion of the snap fit portion 52 against the elastic force, and is engaged, and the throttle body side flange 5 and the manifold are engaged. The side flanges 41 can be elastically fastened.

  The claw portion 51 is rotated with respect to the snap fit portion 52 until the first to third fastening bosses 12a to 12c coincide with the first to third support bosses 42a to 42c, and then, as described above. Fasten the bolts.

  Thus, since the elastic fastening means 50 elastically fastens between the throttle body side flange 5 and the manifold side flange 41, the fastening force between the throttle body side flange 5 and the manifold side flange 41 is strengthened and interposed between them. The sealing function of the O-ring 48 can be ensured. Moreover, even if there is a slight manufacturing error between the elastic fastening means 50 and the first and second fastening bosses 12a to 12c, the elastic fastening means 50 is elastically deformed by its elastic part, that is, the snap fit part 52. Thus, the manufacturing error can be absorbed, so that distortion of the throttle body 1 can be prevented. Further, the engaging state of the claw portion 51 and the snap fit portion 52 is firmly held by the fastening between the first to third fastening bosses 12a to 12c and the first to third supporting bosses 42a to 42c, and there is no fear of loosening.

  Next, a second embodiment of the present invention shown in FIG. 6 will be described.

  In this second embodiment, the elastic fastening means 50 comprises an elastic clip 53 that elastically clamps between the throttle body side flange 5 and the manifold side flange 41. In this case, the elastic clip 53 may directly clamp the throttle body side flange 5 and the manifold side flange 41. However, in order to avoid an increase in the size of the elastic clip 53, the outer periphery of the throttle body side flange 5 is shown in the illustrated example. A thin and thin sandwiched flange 54 is formed on the bottom, and the sandwiched flange 54 and the manifold side flange 41 are sandwiched by an elastic clip 53. Reference numerals 55 and 56 denote annular projections for preventing the elastic clip 53 from coming off formed on the pinched flange 54 and the manifold side flange 41. Since other configurations are the same as those of the previous embodiment, portions corresponding to those of the previous embodiment in FIG. 6 are denoted by the same reference numerals, and redundant description is omitted.

  According to the second embodiment, by making the pinched flange 54 circular, it is possible to reliably prevent distortion of the throttle body 1 due to molding resin shrinkage when the throttle body 1 is molded. Further, the use of the elastic clip 53 can achieve the same effect as the elastic fastening means 50 of the previous embodiment.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, an integral connecting portion for integrally connecting the throttle body 1 and the control housing 3 is formed on the outer periphery of the throttle body 1 at a portion other than one bearing boss 4, for example, at a position sufficiently away from the throttle valve 9. However, since the bearing boss 4 protrudes from the outer peripheral surface of the throttle body 1, if this is used as an integral connecting portion, there is no need to form a special protruding portion on the outer peripheral surface of the throttle body 1, The structure can be simplified. Further, the number of the integral connecting portions is not limited to one, and a plurality of integral connecting portions can be provided.

DESCRIPTION OF SYMBOLS 1 ... Throttle body 2 ... Intake passage 3 ... Control housing 4 ... Bearing boss 5 ... Throttle body side flange 6 ... Valve shaft 7 ... Bearing (Ball bearing)
9... Throttle valve 14 ... Space 20 ... Electric motor 21 ... Reduction gear device 40 ... Intake intake pipe 41 ... Manifold side flanges 43, 44 ... Fastening members (bolts, nut)
50 ... elastic fastening member 51 ... claw part 52 ... snap fit part 53 ... elastic clip

Claims (11)

A throttle body (1) having an intake passage (2) and a control housing (3) adjacent to the throttle body (2) are integrally formed of synthetic resin, and are mounted on a valve shaft (6) rotatably supported on the throttle body (1). , A throttle valve (9) for opening and closing the intake passage (2) is provided, and the control housing (3) is provided with an electric motor (20) and the rotation of the electric motor (20) to reduce the rotation of the valve shaft ( 6), and the throttle body side flange (5) formed at the downstream end of the throttle body (1) is connected to the intake manifold (40) of the intake manifold of the engine. In the engine intake control device that is disposed opposite to the manifold side flange (41) formed in
The throttle body (1) and the control housing (3) are integrally connected via an integral connecting portion (4) located on the outer periphery of the throttle body (1), and the integral connecting portion (4) is avoided. A plurality of fastening bosses (12a, 12b, 12c) to be fastened to the manifold side flange (41) by fastening members (43, 44) are formed in the control housing (3), and these fastening bosses (12a, 12b, 12c) are formed. ) And the throttle body (1) in a section connecting the shortest distance, a space (14) is provided. The intake control apparatus for an engine according to claim 1,
As the fastening boss, the first and second fastening bosses (12a, 12b) arranged across the valve shaft (6) and a straight line (L) connecting the centers of the first and second fastening bosses (12a, 12b). ) To a third fastening boss (near the center of gravity (G) of the throttle body (1) and the control housing (3) on which the throttle valve 9, the electric motor (20) and the reduction gear device (21) are mounted. 12c) is formed in the control housing (3). A throttle body (1) having an intake passage (2) and a control housing (3) adjacent to the throttle body (2) are integrally formed of synthetic resin, and are mounted on a valve shaft (6) rotatably supported on the throttle body (1). , A throttle valve (9) for opening and closing the intake passage (2) is provided, and the control housing (3) is provided with an electric motor (20) and the rotation of the electric motor (20) to reduce the rotation of the valve shaft ( 6), and the throttle body side flange (5) formed at the downstream end of the throttle body (1) is connected to the intake manifold (40) of the intake manifold of the engine. In the engine intake control device that is disposed opposite to the manifold side flange (41) formed in
At least three fastening bosses (12a, 12b, 12c) fastened by fastening members (43, 44) to the manifold side flange (41) are formed in the control housing (3), and among these fastening bolts, A straight line (L) connecting the first and second fastening bosses (12a, 12b) arranged across the valve shaft (6) between the centers thereof, the center of the intake passage (2), and the throttle valve 9 The engine is characterized in that it is disposed so as to pass between the throttle body (1) on which the electric motor (20) and the reduction gear device (21) are mounted and the overall center of gravity (G) of the control housing (3). Intake control device. The intake control apparatus for an engine according to claim 3,
The engine intake control device according to claim 1, wherein the remaining third fastening boss (12c) of the three fastening bolts is disposed closer to the overall center of gravity (G) than the straight line (L). The intake control apparatus for an engine according to claim 4,
An intake control device for an engine, wherein the three fastening bosses (12a, 12b, 12c) are arranged so as to surround the overall center of gravity (G). The engine intake control device according to any one of claims 3 to 5,
The throttle body (1) and the control housing (3) are integrally connected via an integral connecting portion (4) located on the outer periphery of the throttle body (1), and the integral connecting portion (4) is avoided. The first to third fastening bosses (12a, 12b, 12c) are formed in the control housing (3), and the first to third fastening bosses (12a, 12b, 12c) and the throttle body (1) are shortest. An intake control device for an engine, wherein a space (14) is provided in a section connected by a distance. The engine intake control device according to any one of claims 2, 4 to 6,
The position of the resultant force (F) of the fastening force of the first, second and third fastening bosses (12a, 12b, 12c) with respect to the manifold side flange (41) is substantially coincident with the position of the total center of gravity (G). An intake control device for an engine, characterized in that The engine intake control device according to any one of claims 1 to 7,
An engine intake control apparatus comprising an elastic fastening means (50) for elastically fastening the manifold side flange (41) and the throttle body side flange (5). The intake control apparatus for an engine according to claim 8,
The elastic fastening means (50) is formed on the throttle body side flange (5), formed on a claw portion (51) thinner than the flange (5), and on the manifold side flange (41). An intake control device for an engine characterized by comprising a snap fit portion (52) that elastically engages with the portion (51). The intake control apparatus for an engine according to claim 8,
The engine intake control device according to claim 1, wherein the elastic fastening means (50) comprises an elastic clip (53) that elastically clamps the manifold side flange (41) and the throttle body side flange (5). The engine intake control device according to any one of claims 1, 2, 6, and 7,
The engine is characterized in that the integral connecting portion is constituted by a bearing boss (4) protruding from an outer peripheral surface of the throttle body (1) and supporting the valve shaft (6) via a bearing (7). Intake control device.

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