JP2017180311A - Intake control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake control device which is compact and can be adapted to the shape of a cowl of a motor cycle.SOLUTION: An intake control device 1 includes a valve gear 9 fixed to a valve shaft 4 of a throttle body 3, 30, a pinion gear 8 disposed on a rotating shaft of a motor 6, a speed reduction gear 10 transmitting power of the pinion gear 8 to the valve gear 9, and a gear cover 11, 31 forming a gear accommodation portion for accommodating these gears, with a side face of the throttle body 3, 30. A large gear 14 of the speed reduction gear 10 is positioned inside of a small gear 15, the motor 6 is positioned at an inner side with respect to the pinion gear 8, an outer side face 16 of the gear cover 11, 31 is successively displaced inward from a part opposed to an end portion of the valve shaft 4 to a part opposed to the speed reduction gear, and from a part opposed to the speed reduction gear to a part opposed to the pinion gear 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an intake air control device that controls intake air of an internal combustion engine.

  2. Description of the Related Art Conventionally, an intake control device that controls intake air of an internal combustion engine is known in which an intake passage of a throttle body is opened and closed by a butterfly type throttle valve (see, for example, Patent Document 1). In the intake control device of Patent Document 1, the opening and closing of the throttle valve is controlled by the motor rotating the valve shaft that supports the throttle valve.

  At that time, the driving force of the motor is controlled through a pinion gear provided on the rotating shaft, a reduction gear having a large gear and a small gear meshing with the pinion gear, and a valve gear meshed with the small gear and fixed to the valve shaft. Transmitted to the shaft. These gears are housed in a gear housing portion formed between the side surface of the throttle body and the gear cover that covers the gear.

JP-A-11-132707

  However, according to the intake control device of Patent Document 1, the cross section of the gear housing portion parallel to the surface including the shaft of each gear has a rectangular shape, and an unnecessary space exists in the gear housing portion. If such an unnecessary space can be eliminated, it is considered that the intake control device can be configured more compactly.

  Further, the above-described cross-sectional shape of the gear housing portion is a rectangular shape that is long in a direction substantially perpendicular to the valve shaft. For this reason, when the intake control device is mounted on a motorcycle so that the length direction thereof is along the front-rear direction of the vehicle, the dimensions of the cowl so that the rectangular front outer corner does not interfere with the inner wall of the cowl. It is necessary to give a margin. In other words, an unnecessary space is created inside the cowl.

  An object of the present invention is to provide an intake control device that is compact and can be adapted to the shape of a cowl of a motorcycle in view of the problems of the prior art.

  An intake control device according to a first aspect of the present invention includes a throttle body provided with an intake passage, a valve shaft rotatably provided in the throttle body and arranged extending in a vehicle width direction of the vehicle, and fixed to the valve shaft. A butterfly-type throttle valve that opens and closes the intake passage, a valve gear fixed to the valve shaft, a motor supported by the throttle body, a pinion gear provided on the rotation shaft of the motor, and a large gear And a reduction gear that has a small gear with fewer teeth than that, decelerates the power of the pinion gear and transmits it to the valve gear, and a gear storage portion that stores the pinion gear, the reduction gear, and the valve gear. A gear cover formed between the side surfaces of the body, and the large gear of the reduction gear is more forward than the small gear in the direction along the valve shaft. Located on the inner side of the throttle body, the motor is located on the inner side of the pinion gear, and the outer surface of the gear cover opposite to the inner side is an end portion of the valve shaft. And a portion facing the reduction gear, and a portion facing the pinion gear from a portion facing the reduction gear to a portion facing the pinion gear.

  According to the first aspect of the invention, since the surface of the gear cover opposite to the throttle body is sequentially positioned inward as described above, the width of the device is larger than when the outer surface of the gear cover is planar. Is gradually narrowed from the valve shaft side to the motor side, so that the apparatus can be made compact and adapted to the shape of the cowl of the motorcycle.

  That is, when the intake control device of the present invention is mounted on a motorcycle, the intake control device is in such a posture that the outer surface of the gear cover is arranged along the shape of a cowl that narrows toward the front of the motorcycle. The motorcycle can be made compact and easy to ride.

  In addition, when the gear cover is formed by being sequentially positioned inward as described above, the portion corresponding to the valve gear is the portion that bulges most in the valve axis direction, but when adapted to the cowl shape as described above. The bulge amount can be increased relatively easily. Therefore, a space for arranging a sensor or the like for detecting the opening degree of the throttle valve can be easily secured between the valve gear and the gear cover.

  In the intake control device according to a second aspect of the present invention, in the first aspect, the gear cover and the throttle body are joined to each other via a joint surface, and the joint surface is the entire outer surface of the gear cover. Further, it is configured as a plane having an inclination along an inclination with respect to the valve shaft.

  According to the second invention, since the joint surface is configured as a flat surface, the airtightness at the joint surface can be improved.

  Further, since the joint surface is inclined along the outer surface of the gear cover with respect to the valve shaft, the cross-sectional shape of the gear cover on the surface including the valve shaft and the shaft of each gear is made closer to a rectangular shape. Can do. Therefore, the gear cover can be formed relatively advantageously in terms of deformation and strength balance.

  Furthermore, since the joint surface between the throttle body and the gear cover is inclined as described above, the valve shaft side end of the throttle body bulges toward the gear cover. Therefore, a part such as a stop screw can be easily attached to the metal throttle body by attaching to the bulged portion.

  According to a third aspect of the present invention, there is provided an intake control device according to the second aspect, wherein a bulge portion bulging toward the gear cover side of an end portion on the valve shaft side of the throttle body is in contact with the valve gear and is a minimum of the throttle valve. A stop screw for determining the opening degree is provided.

  According to the third aspect of the invention, the stop screw is provided at the bulging portion of the throttle body, so that the stop screw can be attached to the throttle body relatively easily.

  An intake control device according to a fourth aspect of the present invention is characterized in that, in any one of the first to third aspects, the pinion gear is attached to a vehicle so as to be positioned in front of the valve gear side.

  According to the fourth aspect of the present invention, water droplets or the like adhering or staying on the end face of the gear cover can be easily blown off by the airflow from the front while the vehicle is running. Accordingly, it is possible to prevent water droplets or the like from entering the gear cover and adhering to the gear, motor, sensor, or the like in the gear cover. Further, it is possible to prevent water droplets and the like from entering the gaps between the joint surfaces of the throttle body and the gear cover as much as possible and prevent corrosion of the joint surfaces. Furthermore, it is possible to prevent water droplets or the like from staying in the stop screw and deteriorating the stop screw.

It is a front view which shows the principal part of the intake control device which concerns on one Embodiment of this invention. It is a figure which shows an example of the shape of the gear cover of the intake control device of FIG. 3A is a front view showing the effect of the gear cover of the intake control device of FIG. 1, and FIG. 3B is a side view showing the effect of the gear cover. It is a figure which shows the other example of the shape of the gear cover of the intake control device of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The intake control device 1 according to the embodiment controls intake air to the internal combustion engine. As shown in FIG. 1, the intake air control device 1 is provided with a throttle body 3 provided with an intake passage 2 and rotatably provided in the throttle body 3. A valve shaft 4 and a butterfly throttle valve 5 which is fixed to the valve shaft 4 and opens and closes the intake passage 2 are provided.

  The valve shaft 4 is rotated via a gear mechanism 7 by a motor 6 supported by the throttle body 3. The gear mechanism 7 includes a pinion gear 8 fixed to the rotation shaft of the motor 6, a valve gear 9 fixed to the valve shaft 4, and a reduction gear 10 that reduces and transmits the driving force of the pinion gear 8 to the valve gear 9. Composed. One side surface of the throttle body 3 and the gear cover 11 covering the side surface form a gear housing portion that houses the reduction gear 10 therebetween.

  The reduction gear 10 is provided on a rotation shaft that is rotatably supported by the throttle body 3, and includes a large gear 14 that meshes with the pinion gear 8, and a small gear 15 that is integral with the gear 14 and meshes with the valve gear 9. The large gear 14 has more teeth than the small gear 15 and is located on the A direction side of the small gear 15. The motor 6 is located on the A direction side with respect to the pinion gear 8. The A direction side is the inner side of the throttle body 3 in the direction along the valve shaft 4, and the opposite side is the B direction side.

  Corresponding to the arrangement of the valve gear 9, the reduction gear 10, and the pinion gear 8, the outer surface 16 that is the surface on the B direction side of the gear cover 11 extends from the portion corresponding to the valve shaft 4 to the portion corresponding to the pinion gear 8. In the range E, the pinion gear 8 side is displaced toward the A direction side in accordance with the arrangement of the components in the gear cover 11, and has a stepped shape.

  Therefore, the outer surface 16 is inclined with respect to the valve shaft 4 as indicated by a line L as a whole. Then, the width of the intake control device 1 is as much as the outer surface 16 is displaced as compared with the case where the outer surface 16 is a plane perpendicular to the valve shaft 4 (in this embodiment, it has a stepped shape). Therefore, it gradually narrows from the valve shaft 4 side to the pinion gear 8 side.

  Correspondingly, the gear cover 11 has a cover bulging portion 17 that bulges most in the direction of the valve shaft 4 at a portion corresponding to the valve shaft 4 or the valve gear 9. A return spring 18 for urging the throttle valve 5 in the closing direction is provided in the space between the cover bulging portion 17 of the gear cover 11 and a portion of the gear cover 11 that is lowered to the first stage A direction side and the valve gear 9.

  The return spring 18 is constituted by a mainspring spring so as to be accommodated in this space. One end of the return spring 18 is fixed to the throttle body 3 or the gear cover 11, and the other end is fixed to the valve gear 9 or the valve shaft 4.

  Further, in the space between the cover bulging portion 17 and the return spring 18, the rotor 19 and the stator 20 of the opening sensor for detecting the rotation angle of the throttle valve 5 are positioned in this order in the B direction. Provided. The rotor 19 is connected to the valve shaft 4, and the stator 20 is fixed to the gear cover 11.

  As shown in FIG. 2, the gear cover 11 and the throttle body 3 are joined to each other via a joining surface 21. The joint surface 21 is configured by a plane having an inclination along the overall inclination (indicated by the line L in FIG. 1) of the outer surface 16 of the gear cover 11 that has a stepped shape with respect to the valve shaft 4. . In FIG. 2, the joint surface 21 is indicated by a one-dot chain line, and the shape of the main part of the gear cover 11 as viewed from the direction along the central axis of the intake passage 2 is indicated by a thick broken line.

  Thus, since the joint surface 21 is inclined with respect to the valve shaft 4 at an angle along the outer surface of the gear cover 11, the direction along the central axis of the intake passage 2 (perpendicular to the valve shaft 4 and the rotation axis of the motor 6). The shape of the gear cover 11 as viewed from the direction in which it approaches is rectangular. Therefore, the gear cover 11 is formed so as not to be deformed and to have a good balance of strength.

  Further, since the joint surface 21 between the throttle body 3 and the gear cover 11 is inclined as described above, the gear cover 11 is provided at the joint surface 21 side of the throttle body 3 and at the end of the valve shaft 4 side. A body bulging portion 22 bulging to the side (B direction side) is formed. The body bulging portion 22 bulges considerably outside the valve gear 9 in the direction along the valve shaft 4 from a similar portion of the conventional intake control device.

  Therefore, a part such as the stop screw 23 that determines the minimum opening of the throttle valve 5 in contact with the valve gear 9 is easily attached to the metal throttle body 3 by being attached to the body bulging portion 22. .

  Specifically, the body bulging portion 22 is provided with a screw hole 24 penetrating to the valve gear 9 side for attaching the stop screw 23. Correspondingly, the valve gear 9 is provided with a contact surface 25 for determining the minimum opening of the throttle valve 5 in contact with the front end surface of the stop screw 23.

  In this configuration, when the intake control device 1 is attached to a motorcycle, the intake shaft is attached so that the pinion gear 8 is positioned in front of the valve gear 9 and the valve shaft 4 is substantially parallel to the vehicle width direction W. It is done. As a result, the gear cover 11 is displaced in the direction in which the outer side surface 16 that is displaced (in the present embodiment has a stepped shape) is located closer to the front side of the vehicle in a direction in which the vehicle width becomes narrower. Placed in.

  The stop screw 23 is attached to the throttle body 3 by screwing the stop screw 23 into the screw hole 24 of the body bulging portion 22 of the throttle body 3. At this time, since the body bulging portion 22 bulges in the vehicle width direction W, the stop screw 23 is screwed into the screw hole 24 and the screwing amount is easily set.

  Thereafter, a cowl 27 is attached to the motorcycle, and the cowl 27 is curved in a direction in which the vehicle width becomes narrower toward the front side of the vehicle. Therefore, the cowl 27 is located outside the intake control device 1 so as to be along the outer surface 16 of the gear cover 11 of the intake control device 1 that is displaced in a direction in which the vehicle width becomes narrower as the portion located on the front side of the vehicle. It is attached. Thereby, the effective use of the space inside the cowl 27 is achieved.

  When the motorcycle is driven, the outer surface 16 of the gear cover 11 is displaced (in the present embodiment, it is stepped), and is inclined overall with respect to the traveling direction, and the wind pressure is good. Therefore, as shown in FIG. 3A and FIG. 3B, the water droplets and the like 26 adhering to the outer surface 16 are effectively blown away without going around to the throttle body 3 side. Therefore, it is avoided as much as possible that water drops enter the joint surface 21 of the throttle body 3 and the gear cover 11, enter the gear cover 11, or stay in the stop screw 23.

  While the motorcycle is running, the motor 6 is controlled based on the driver's accelerator operation or the like, and the opening of the throttle valve 5 is adjusted appropriately. Thereby, the amount of intake air supplied to the engine via the intake passage 2 is appropriately controlled.

  As described above, according to the present embodiment, the outer surface 16 of the gear cover 11 is displaced (in the present embodiment, has a stepped shape), and the outer surface 16 is planar. Thus, since the width of the intake control device 1 gradually decreases in the A direction from the valve shaft 4 side to the motor 6 side, the intake control device 1 can be configured compactly.

  Therefore, when the intake control device 1 is mounted on a motorcycle, the outer surface 16 of the gear cover 11 is installed along the inner wall of the cowl 27 to make the motorcycle compact and easy to ride. it can.

  Further, since the outer surface 16 of the gear cover 11 is displaced (in the present embodiment, stepped), the cover bulging portion 17 that bulges most in the direction of the valve shaft 4 can be formed on the gear cover 11. it can. In this case, the amount of bulge can be easily increased by installing the intake control device 1 in conformity with the shape of the cowl 27 as described above.

  Therefore, a space for arranging the rotor 19, the stator 20, the return spring 18, etc. of the sensor that detects the opening degree of the throttle valve 5 can be easily secured between the valve gear 9 and the gear cover 11.

  Moreover, since the joint surface 21 between the throttle body 3 and the gear cover 11 is a flat surface, the airtightness at the joint surface 21 can be improved.

  Further, since the joint surface 21 is inclined with respect to the valve shaft 4 along the outer surface 16 of the gear cover 11, the shape of the gear cover 11 as viewed from the direction orthogonal to the valve shaft 4 and the rotation axis of the motor 6 can be obtained. It can be close to a rectangular shape. Therefore, the gear cover 11 can be molded as being difficult to deform and having a good balance of strength.

  Further, since the joint surface 21 is inclined as described above, a body bulging portion 22 is formed at the end of the throttle body 3 on the joint surface 21 side and on the valve shaft 4 side. The stop screw 23 can be easily attached.

  Further, the end surface of the pinion side gear cover that is displaced further inward is disposed in the front of the vehicle, and the end surface of the valve gear side that is displaced further outward is disposed in the rear of the vehicle, so that the gear cover 11 Water drops or the like adhering to or staying on the end face can be easily blown off by the airflow from the front while the vehicle is running. Therefore, it is possible to avoid inconveniences caused by water droplets or the like entering the gear cover, entering the joining surface 21, or staying in the stop screw 23.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this. For example, as shown in FIG. 4, instead of the throttle body 3 and the gear cover 11 described above, the shape 33 of the main portion indicated by the broken line of the gear cover viewed from the direction along the central axis of the intake passage 2 is substantially A throttle body and a gear cover having a triangular shape may be employed, and the joint surfaces 32 may be perpendicular to the valve shaft 4.

DESCRIPTION OF SYMBOLS 1 ... Intake control device, 2 ... Intake passage, 3, 30 ... Throttle body, 4 ... Valve shaft, 5 ... Throttle valve, 9 ... Valve gear, 6 ... Motor, 8 ... Pinion gear, 14 ... Large gear, 15 ... Small gear DESCRIPTION OF SYMBOLS 10 ... Reduction gear, 11 ... Gear cover, 16 ... Outer surface, 21, 32 ... Joint surface, 22 ... Body bulge part, 23 ... Stop screw.

Claims (4)

A throttle body provided with an intake passage;
A valve shaft that is rotatably provided in the throttle body and is arranged extending in the vehicle width direction of the vehicle;
A butterfly throttle valve fixed to the valve shaft and opening and closing the intake passage;
A valve gear fixed to the valve shaft;
A motor supported by the throttle body;
A pinion gear provided on the rotating shaft of the motor;
A reduction gear which has a large gear and a small gear with fewer teeth than this, and which reduces the power of the pinion gear and transmits it to the valve gear;
A gear cover that forms a gear housing portion that houses the pinion gear, the reduction gear, and the valve gear with a side surface of the throttle body;
The large gear of the reduction gear is located on the inner side of the throttle body in the direction along the valve shaft than the small gear.
The motor is located on the inner side of the pinion gear,
An outer surface of the gear cover opposite to the inner side extends from a portion facing the reduction gear to a portion facing the speed reduction gear from a portion facing the end portion of the valve shaft to the pinion. An air intake control device, wherein the air intake control device is sequentially positioned on the inward side over a portion facing the gear.   The gear cover and the throttle body are joined to each other via a joint surface, and the joint surface has an inclination along an overall inclination of the outer surface of the gear cover with respect to the valve shaft. The intake control device according to claim 1, wherein the intake control device is configured as a plane.   A stop screw for determining a minimum opening of the throttle valve in contact with the valve gear is provided at a bulging portion that bulges toward the gear cover at an end on the valve shaft side of the throttle body. The intake control device according to claim 2.   The intake control device according to any one of claims 1 to 3, wherein the pinion gear is attached to a vehicle such that the pinion gear is positioned in front of the valve gear side.