JP2012197774A - Saddle-riding type vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a saddle-riding type vehicle suppressing projecting of a valve driving motor to the vehicle width direction outside to make the vehicle compact.SOLUTION: In this saddle-riding type vehicle including an engine 13 supported by a main frame 3 and including a cylinder 15 and a cylinder head 16, an intake pipe 19 extending from an upper part of the cylinder head 16 toward a front upper side, a throttle valve 20 arranged in the middle of the intake pipe 19 to adjust amount of air to be supplied to the engine 13, and a valve driving motor for driving the throttle valve 20 according to an input from an operation element operated by an occupant, a rotary shaft of the throttle valve 20 and a rotary shaft of the valve driving motor are extended in a vehicle body vertical direction and are provided in parallel with each other.

Description

  The present invention relates to a straddle-type vehicle including a throttle valve and a valve drive motor that drives the throttle valve.

  Conventionally, in a saddle riding type vehicle such as a motorcycle equipped with an engine supported by a lower part of a main frame extending rearward and downward from a head pipe, an intake pipe for supplying air to the engine is directed from the upper part of the cylinder head toward the front upper part. Is provided. A throttle valve for adjusting the amount of air supplied to the engine is disposed in the intake pipe. This throttle valve is an electric throttle valve that is controlled to open and close in response to an input from an operator operated by a passenger, and includes a valve drive motor for driving the throttle valve (see, for example, Patent Document 1). . This type of throttle valve is arranged such that the rotation axis of the throttle valve is along the vehicle width direction so that an air flow path is formed above and below the throttle valve. The valve drive motor that drives the throttle valve is also arranged so that the rotation shaft is along the vehicle width direction so that the rotation direction of the rotation shaft matches the rotation direction of the rotation shaft of the throttle valve.

JP 2008-45434 A

However, when the rotation shaft of the valve drive motor is arranged along the vehicle width direction as in the prior art, the valve drive motor projects outward in the vehicle width direction. As a result, the lateral bulge of the vehicle by the valve drive motor increases, and there is a problem that the vehicle width increases.
SUMMARY OF THE INVENTION An object of the present invention is to provide a straddle-type vehicle that solves the above-described problems of the conventional technology, suppresses the protrusion of the valve drive motor to the outside in the vehicle width direction, and can reduce the size of the vehicle. To do.

  In order to achieve the above object, the present invention provides a main frame (3) comprising a head pipe (5) for rotatably supporting a steering device, and a single frame extending rearward and downward from the head pipe (5). An engine (13) supported by the main frame (3) and having a crankcase (14), a cylinder (15) projecting forward from the crankcase (14), and a cylinder head (16), and the cylinder head An intake pipe (19, 119) extending from the upper part of (16) toward the front upper side, and a throttle arranged in the middle of the intake pipe (19, 119) for adjusting the amount of air supplied to the engine (13) A valve (201) and a valve drive motor (220) that drives the throttle valve (201) in response to an input from an operator operated by an occupant. In the saddle-ride type vehicle, the rotation shaft (202) of the throttle valve (201) and the rotation shaft (221) of the valve drive motor (220) extend in the vehicle body vertical direction or vehicle body longitudinal direction and are parallel to each other. It is provided.

The said structure WHEREIN: The said valve drive motor (220) is good also as a structure arrange | positioned above the said rotating shaft (202) of the said throttle valve (201).
Moreover, the said structure WHEREIN: The said valve drive motor (220) is good also as a structure arrange | positioned so that it may overlap with the said main frame (3) in side view.

Moreover, the said structure WHEREIN: The said valve drive motor (220) is good also as a structure supported by the said main frame (3).
In the above configuration, an intake chamber (17, 117) communicating with the intake pipe (19, 119) is provided on the upstream side of the intake pipe (19, 119), and the valve drive motor (220) has a side surface. It is good also as a structure arrange | positioned so that it may overlap with the said intake chamber (17, 117) in view.

In the above configuration, the valve drive motor (220) may be supported by the intake chambers (17, 117).
Moreover, the said structure WHEREIN: The said intake chamber (17, 117) is equipped with the recessed part (B) in the side surface, and the said valve drive motor (220) is good also as a structure arrange | positioned in the said recessed part (B).

Moreover, the said structure WHEREIN: The said intake chamber (17, 117) is good also as a structure provided with the rib (27c) which covers the part of the said valve drive motor (220) projected outside from the said recessed part (B) from the front.
In the above configuration, the intake pipes (19, 119) are disposed substantially parallel to the main frame (3) and offset from the main frame (3) to the outside of the vehicle body in a plan view. A throttle body (200) that supports the throttle valve (201) is disposed under the frame (3), and a rotation shaft (221) of the valve drive motor (220) and a rotation shaft (202) of the throttle valve (201). ) Extending in the vertical direction of the vehicle body and parallel to each other, and offset to the outside of the vehicle body in the length direction of the intake pipes (19, 119).

In the above configuration, the rotary shaft (221) of the valve drive motor (220) and the rotary shaft (202) of the throttle valve (201) mesh with each other, and the rotation of the valve drive motor (220) is controlled by the throttle valve. The reduction gears (21, 210) transmitted to (201) may be arranged toward the outside of the vehicle body in the order of the reduction gears (21, 210) and the valve drive motor (220).
Further, in the above configuration, the valve drive motor (220) may be arranged in the space above the intake pipe (19, 119).

  In the above configuration, the intake pipe (19, 119) includes a resonator (129) for reducing the intake noise of the intake pipe (19, 119) above the intake pipe (19, 119), and the resonator The valve drive motor (220) may be arranged behind (129).

According to the present invention, the rotation shaft of the throttle valve and the rotation shaft of the valve drive motor that drives the throttle valve are provided in parallel to each other so as to extend in the vehicle body vertical direction or vehicle body front-rear direction. This makes it possible to align the rotation direction of the rotation shaft of the throttle valve and the rotation shaft of the valve drive motor that drives the throttle valve, without using a bevel gear or the like for changing the transmission direction of the valve drive motor power. The power of the valve drive motor can be transmitted to the throttle valve, and the valve drive motor can be prevented from protruding outward in the vehicle width direction. Therefore, when the electric throttle valve is applied to the layout structure of the saddle riding type vehicle, the vehicle can be made compact.
The valve drive motor is disposed above the rotation shaft of the throttle valve. As a result, the valve drive motor can be separated from the engine, and the valve drive motor is less susceptible to the heat generated by the engine. In addition, the valve drive motor can be arranged near the side of the intake pipe where there is enough space so that the rotating shaft extends vertically, so when the valve drive motor is placed horizontally above the intake pipe In comparison, the lateral protrusion of the valve drive motor can be reduced.

Further, the valve drive motor is disposed so as to overlap the main frame in a side view. Thereby, at least a part of the main frame is arranged in a space formed by the valve drive motor and the throttle valve, and the position of the main frame can be lowered. Therefore, it is possible to further improve the boarding / exiting performance of the occupant.
The valve drive motor is supported by the main frame. Thereby, the heavy valve drive motor can be firmly supported by the relatively rigid main frame.
An intake chamber communicating with the intake pipe is provided on the upstream side of the intake pipe, and the valve drive motor is disposed so as to overlap the intake chamber in a side view. As a result, the valve drive motor can be separated from the engine, and the valve drive motor is less susceptible to the heat generated by the engine.

The valve drive motor is supported by the intake chamber. Thereby, a valve drive motor can be firmly fixed.
The intake chamber includes a recess on a side surface, and the valve drive motor is disposed in the recess. As a result, the valve drive motor can be arranged without protruding in the lateral width direction of the intake chamber or with a reduced extent of protrusion. Further, the valve drive motor can be brought close to the center of the vehicle body by disposing the valve drive motor in the recess. Therefore, the position of the center of gravity of the vehicle can be made closer to the center of the vehicle body. Therefore, the center of gravity of the vehicle can be closer to the center of the vehicle body while ensuring the capacity of the intake chamber.
In addition, the intake chamber includes a rib that covers a portion of the valve drive motor that protrudes outward from the recess from the front. Thereby, even if solids such as stones, water, etc. fly from the front of the intake chamber, the valve drive motor can be protected by the intake chamber. Further, since it is not necessary to attach a protective member or the like to the valve drive motor, an increase in weight and cost can be suppressed.

In addition, the intake pipe is disposed substantially parallel to the main frame and offset from the main frame to the outside of the vehicle body in a plan view, and a throttle body that supports the throttle valve is disposed under the main frame. The rotating shaft and the rotating shaft of the throttle valve are provided so as to extend in the vertical direction of the vehicle body and are parallel to each other and offset to the outside of the vehicle body in the length direction of the intake pipe. As a result, interference between the valve drive motor and the vehicle main frame can be prevented and the throttle body can be arranged close to the vehicle main frame, and the protrusion of the valve drive motor to the outside in the vehicle width direction can be suppressed, resulting in a compact vehicle. Can be achieved.
Further, a reduction gear that meshes with the rotation shaft of the valve drive motor and the rotation shaft of the throttle valve and transmits the rotation of the valve drive motor to the throttle valve is arranged in the order of the reduction gear and the valve drive motor toward the outside of the vehicle body. Thereby, interference with a valve drive motor and the main frame of a vehicle can be prevented, and a throttle body can be arrange | positioned close to the main frame of a vehicle.

In addition, a valve drive motor is arranged in the space above the intake pipe. Thereby, a valve drive motor can be arrange | positioned along the up-down direction of a vehicle, and the protrusion to the vehicle width direction outer side of a valve drive motor can be suppressed. Therefore, interference between the valve drive motor and the occupant's feet can be avoided.
In addition, the intake pipe is provided with a resonator for reducing the intake noise of the intake pipe above the intake pipe, and a valve drive motor is disposed behind the resonator. Thereby, even if solids such as stones, water, etc. fly from the front of the resonator, the valve drive motor can be protected by the resonator. Further, since it is not necessary to attach a protective member or the like to the valve drive motor, an increase in weight and cost can be suppressed.

1 is a left side view showing an overall configuration of a saddle riding type vehicle according to a first embodiment to which the present invention is applied. It is a left side view around the engine of the saddle riding type vehicle in the first embodiment. FIG. 3 is a schematic diagram of a cross section taken along the line aa in FIG. 2. It is a left side view around the engine of the saddle riding type vehicle in the second embodiment. FIG. 5 is a schematic diagram of a cross section taken along line bb in FIG. 4. It is a left view of the saddle riding type vehicle main part in 3rd Embodiment. It is a top view of the saddle riding type vehicle main part in 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the following description, an embodiment in which the saddle riding type vehicle according to the present invention is a small motorcycle will be described. Arrow FR shown in each figure indicates the front of the vehicle, arrow LH indicates the left side of the vehicle, and arrow UP indicates the upper side of the vehicle.

<First Embodiment>
FIG. 1 is a left side view showing an overall configuration of a motorcycle (saddle-type vehicle) 1 according to a first embodiment to which the present invention is applied. As shown in FIG. 1, the motorcycle 1 according to this embodiment includes a body frame 2, and the body frame 2 includes a main frame 3 and a rear frame 4. The main frame 3 is joined to the rear side surface of the head pipe 5 by welding, and extends from the head pipe 5 so as to be inclined rearward and downward. The rear frame 4 is joined to the rear end of the main frame 3 by welding. The main frame 3 and the rear frame 4 are formed of steel pipes. The main frame 3 can be formed in a shape such as a substantially circular cross section, an I shape, or a U shape that opens downward. The main frame 3 can also be formed using an aluminum casting or the like.

Below the head pipe 5, a pair of left and right front forks 6 are attached to be steerable. The front fork 6 rotatably supports the front wheel 7. A rear fork 9 is attached to the lower end of the rear frame 4 via a pivot shaft 4a so as to be swingable up and down. The rear fork 9 rotatably supports the rear wheel 8.
A saddle 11 on which an occupant sits is attached to the upper surface of the rear frame 4. A rear cushion 10 is interposed between the rear fork 9 and the rear frame 4, and the rear cushion 10 is connected to the vicinity of the rear end of the rear fork 9 and the rear of the saddle 11 of the rear frame 4. . Further, a fuel tank 12 is accommodated inside the rear frame 4 and immediately below the saddle 11, and the fuel tank 12 is held by the rear frame 4.

  A crankcase 14 of an engine 13 serving as a prime mover is further attached to the rear frame 4. The crankcase 14 is disposed below the joint between the main frame 3 and the rear frame 4. The engine 13 includes a crankcase 14, a cylinder block 15 protruding forward from the crankcase 14, and a cylinder head 16 attached to the front end of the cylinder block 15. The crankcase 14, the cylinder block 15, and the cylinder head 16 are assembled together to constitute the engine 13.

An intake chamber (air cleaner) 17 is attached behind the head pipe 5 and below the front end of the main frame 3. The intake chamber 17 and the intake port 18 (see FIG. 2) of the cylinder head 16 are connected via an intake pipe 19. That is, the intake chamber 17 communicates with the intake pipe 19 and is disposed on the upstream side of the intake pipe 19. The intake pipe 19 is disposed below the main frame 3. A throttle valve unit 20 that adjusts the amount of air supplied to the engine 13 by electronic control according to the throttle operation by the occupant is attached to the intake pipe 19.
The motorcycle 1 also includes a vehicle body cover 31 attached to the upper surface of the main frame 3. The vehicle body cover 31 is disposed so as to cover the main frame 3, the cylinder block 15, the cylinder head 16, the intake chamber 17, the intake pipe 19, and the throttle valve unit 20 from the side and from above.

  FIG. 2 is a left side view around the engine of the motorcycle 1 shown in FIG. As shown in FIG. 2, the intake pipe 19 includes a connecting tube 21 and an intake pipe 22. The connecting tube 21 extends obliquely from an intake chamber 17 provided at the upper front of the vehicle body to a throttle valve unit 20 provided at the lower rear of the vehicle body. The upper end of the connecting tube 21 protrudes into the intake chamber 17 and opens.

  The intake chamber 17 includes a chamber case 27, a case cover 28, and an air cleaner element 29. The chamber case 27 is formed of a resin material, and is disposed directly under the main frame 3 in front of the engine 13. The chamber case 27 includes an opening 27a on the front surface. The opening 27 a is closed by a case cover 28 attached to the front side of the chamber case 27. An opening 28a is formed in the upper part of the case cover 28, and an inlet duct 32 for taking in outside air is connected to the opening 28a.

  The air cleaner element 29 is provided so as to face the case cover 28. The air flowing in from the inlet duct 32 is introduced into the air cleaner element 29 from the front side (dirty side) of the air cleaner element 29 and purified. The air purified through the air cleaner element 29 is supplied to the intake pipe 19 from the rear surface side (clean side) of the air cleaner element 29. The periphery of the air cleaner element 29 is sealed by a seal member (not shown) so that the air flowing in from the inlet duct 32 always passes through the air cleaner element 29 and is supplied to the connecting tube 21. The lower end of the connecting tube 21 is connected to the suction side of the throttle valve unit 20.

An intake pipe 22 is connected between the throttle valve unit 20 and the intake port 18 of the cylinder head 16. The upper end of the intake pipe 22 is connected to the discharge side of the throttle valve unit, and the lower end of the intake pipe 22 is connected to the intake port 18 of the cylinder head 16. The intake pipe 22 is also provided with a fuel injection device 23 that injects fuel toward the intake port 18. Although not shown, the fuel injection device 23 sprays the fuel supplied from the fuel inlet provided at the upper end toward the intake port 18 from the opening provided at the lower end.
The outside air sucked into the intake port 18 from the intake chamber 17 through the connecting tube 21, the throttle valve unit 20, and the intake pipe 22 is mixed with the fuel sprayed from the fuel injection device 23 in the intake port 18. It becomes.

FIG. 3 is a schematic diagram of a cross section taken along the line aa in FIG. In FIG. 3, the cross-section and shape of the members are appropriately simplified or omitted for easy explanation.
As shown in FIG. 3, the throttle valve unit 20 includes a throttle body 200, a gear box 210, and a valve drive motor 220. The throttle body 200 supports a butterfly type throttle valve 201. The throttle valve 201 is rotatably supported on the throttle body 200 by a valve rotation shaft 202. The throttle body 200, the throttle valve 201, and the valve rotating shaft 202 are all housed in a throttle valve case 203. One end of the valve rotation shaft 202 extends to the outside of the throttle valve case 203 and is connected to an angle sensor 24 attached to the outer surface of the throttle valve case 203.

The angle sensor 24 detects the opening / closing angle of the throttle valve 201, converts it into an electric signal, and inputs it to a control device (not shown) of the throttle valve unit 20. The control device opens and closes in real time while comparing the control amount (target value) of the opening / closing angle calculated according to the throttle operation by the occupant and the detected amount of the opening / closing angle of the throttle valve 201 transmitted from the angle sensor 24. Angle feedback control is performed.
The other end of the valve rotation shaft 202 protrudes from the throttle valve case 203 into the gear box 210.

  The gear box 210 is a device that decelerates the rotational speed of the rotational output generated by the valve drive motor 220 using a reduction gear. The gear box 210 includes a first spur gear 211, a second spur gear 212, a third spur gear 213, and a fourth spur gear 214 housed in a gear box case 219. The gear box case 219 is connected to the throttle valve case 203.

The first spur gear 211 is attached to the end of the motor rotation shaft 221 that transmits the rotation output of the valve drive motor 220. The second spur gear 212 is attached to the gear rotation shaft 215 and meshes with the first spur gear 211. The gear rotation shaft 215 is rotatably held by bearings 216 and 217 provided on the gear box case 219. A third spur gear 213 is attached to the bearing 217 side of the second spur gear 212. The third spur gear 213 is attached to the gear rotation shaft 215 and rotates together with the second spur gear 212.
The fourth spur gear 214 is attached to the other end of the valve rotation shaft 202, and the fourth spur gear 214 meshes with the third spur gear 213. The motor rotation shaft 221, the gear rotation shaft 215, and the valve rotation shaft 202 extend in the vertical direction of the vehicle body of the motorcycle 1 and are provided in parallel to each other.

  The valve drive motor 220 is a drive source that generates a rotational output for opening and closing the throttle valve 201, and in the present embodiment, is constituted by a cylindrical rotary motor. The valve drive motor 220 is housed in the gear box case 219. The rotational output generated by the valve drive motor 220 is transmitted in the order of the first spur gear 211, the second spur gear 212, the third spur gear 213, and the fourth spur gear 214. The rotation output generated by the valve drive motor 220 is decelerated according to the reduction ratio set for each gear while being transmitted by each gear, and rotates the valve rotation shaft 202. The rotation output generated by the valve drive motor 220 is high rotation and low torque, but is decelerated while being transmitted by each gear and is converted to rotation output of low rotation and high torque.

  The valve drive motor 220 is disposed above the valve rotation shaft 202 of the throttle valve 201 and is disposed so as to overlap the main frame 3 (see FIG. 2) in a side view. The valve drive motor 220 is accommodated in a gear box case 219, and the gear box case 219 is supported by the main frame 3 at a portion where the valve drive motor 220 is accommodated. Specifically, the gear box case 219 includes a mounting bracket 222 formed integrally with the gear box case 219 on the upper part of the portion in which the valve drive motor 220 is accommodated. The mounting bracket 222 is provided with a mounting hole (not shown) through which the bolt 25 passes. The main frame 3 includes a boss portion 3a for attaching the gear box case 219 to the main frame 3, and a screw hole (not shown) formed in the boss portion 3a. The gear box case 219 is fixed to the main frame 3 by aligning the mounting holes of the mounting bracket 222 and the screw holes of the boss portion 3a and screwing them with the bolts 25 and washers 26.

  As described above, according to the present embodiment, the valve rotation shaft 202 of the throttle valve 201 and the motor rotation shaft 221 of the valve drive motor 220 that drives the throttle valve 201 extend in the vehicle body vertical direction of the motorcycle 1. Are provided parallel to each other. According to this configuration, the valve drive motor 220 can be transmitted to the throttle valve 201 without using a bevel gear for changing the power transmission direction of the valve drive motor 220, and the valve drive motor 220 protrudes outward in the vehicle width direction. Can be suppressed. Therefore, when the electric throttle valve 201 is applied to the layout structure of the motorcycle 1, the vehicle can be made compact.

  The valve drive motor 220 is disposed above the valve rotation shaft 202 of the throttle valve 201. According to this configuration, the valve drive motor 220 can be separated from the engine 13, and the valve drive motor 220 is not easily affected by the heat generated in the engine 13. Further, the valve drive motor 220 can be arranged near the side of the intake pipe 19 having a sufficient space so that the motor rotation shaft 221 extends in the vertical direction. Compared to the case where the valve drive motor 220 is disposed in a horizontal position, the lateral protrusion of the valve drive motor 220 can be reduced.

Further, the valve drive motor 220 is disposed so as to overlap the main frame 3 in a side view. According to this configuration, at least a part of the main frame 3 is disposed in a space formed by the valve drive motor 220 and the throttle valve 201, and the position of the main frame 3 can be lowered. Therefore, it is possible to further improve the boarding / exiting performance of the occupant.
The valve drive motor 220 is supported by the main frame 3. Thereby, the heavy valve drive motor 220 can be firmly supported by the main frame 3 having relatively high rigidity.

Second Embodiment
Next, a second embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a left side view around the engine 13 of the motorcycle 1 in the second embodiment. The overall configuration of the motorcycle 1 in the second embodiment is the same as that of the first embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted as appropriate.
In the first embodiment, the throttle valve unit 20 is supported by the main frame 3, but in the second embodiment, the throttle valve unit 20A is supported by the intake chamber 17. The internal configuration of the throttle valve unit 20A is the same as that of the throttle valve unit 20 of the first embodiment, and the description thereof is omitted.

The throttle valve unit 20A is arranged so as to overlap the intake chamber 17 in a side view. The intake chamber 17 is provided on the upstream side of the intake pipe 19 and communicates with the intake pipe 19. As shown in FIG. 5, the intake chamber 17 includes a chamber case 27, a case cover 28, and an air cleaner element 29.
As shown in FIG. 5, the air cleaner element 29 is provided so as to face the case cover 28. The air flowing in from the inlet duct 32 is introduced into the air cleaner element 29 from the front side (dirty side) of the air cleaner element 29 and purified. The air purified through the air cleaner element 29 is supplied to the intake pipe 19 from the rear surface side (clean side) of the air cleaner element 29. The periphery of the air cleaner element 29 is sealed by a seal member (not shown) so that the air flowing in from the inlet duct 32 always passes through the air cleaner element 29 and is supplied to the intake pipe 19.

  A recess B is formed on the left side surface of the chamber case 27, and the throttle valve unit 20A is disposed in the recess B. The throttle valve unit 20A is arranged such that the motor rotation shaft 221 of the valve drive motor 220 extends in the vertical direction. According to this configuration, the valve drive motor 220 can be arranged without protruding in the lateral width direction of the chamber case 27. Further, the recess B is provided at a position behind the chamber case 27 so as not to overlap the air cleaner element 29. According to this configuration, the recess B can be formed without reducing the width of the air cleaner element 29. As a result, it is possible to make the air cleaner element 29 common, and it is possible to prevent the air cleaner element 29 from being deteriorated in performance by reducing the lateral width of the air cleaner element 29 and reducing the capacity.

  The recess B is provided with a rib 27c. The rib 27c may be formed integrally with the chamber case 27, and is formed so as to cover the entire valve drive motor 220 disposed in the recess B from the front, and projects outward from the recess B in the width direction of the chamber case 27. ing. A pair of flanges 250 are provided on the side surface of the gear box case 219 in which the valve drive motor 220 is housed. The flange 250 may be formed integrally with the gear box case 219. The rib 27 c and the flange 250 are provided with mounting holes (not shown) for mounting the gear box case 219 that houses the valve drive motor 220 to the chamber case 27. The gear box case 219 and the chamber case 27 are fixed by screwing bolts 30 into the mounting holes.

  As described above, according to the present embodiment, the intake chamber 17 communicating with the intake pipe 19 is provided on the upstream side of the intake pipe 19, and the valve drive motor 220 is disposed so as to overlap the intake chamber 17 in a side view. Is done. According to this configuration, the valve drive motor 220 can be separated from the engine, and the valve drive motor is less susceptible to the heat generated by the engine.

  The valve drive motor 220 is supported by the intake chamber 17. According to this configuration, the valve drive motor 220 can be firmly fixed. The intake chamber 17 has a recess B on its side surface, and the valve drive motor 220 is disposed in the recess B. According to this configuration, the valve drive motor 220 can be arranged without protruding in the lateral width direction of the intake chamber 17 or with a reduced degree of protrusion. Further, by disposing the valve drive motor 220 in the recess B, the valve drive motor 220 can be brought closer to the center of the vehicle body. Therefore, the position of the center of gravity of the vehicle can be made closer to the center of the vehicle body. Therefore, the center of gravity of the vehicle can be closer to the center of the vehicle body while ensuring the capacity of the intake chamber 17. The intake chamber 17 includes a rib 27c that covers the portion of the valve drive motor 220 that protrudes outward from the recess B from the front. As a result, even if solids such as stones or water fly from the front of the intake chamber 17, the valve drive motor 220 can be protected by the ribs 27c, and it is necessary to attach a protection member or the like to the valve drive motor 220. As a result, weight increase and cost increase can be suppressed.

<Third Embodiment>
Next, a third embodiment will be described with reference to FIGS. FIG. 6 is a left side view around the engine 13 of the motorcycle 1 in the third embodiment. In the first embodiment, the intake chamber 17 is arranged behind the head pipe 5 and below the main frame 3. However, in the third embodiment, the intake chamber 117 is disposed in front of the head pipe 5. It is a configuration to be arranged. According to this configuration, the connecting tube that connects the intake chamber 117 and the throttle body 200 by disposing the intake chamber 117 in front of the head pipe 5 to increase the distance between the intake chamber 117 and the throttle body 200. The length of the intake pipe 121 can be increased, and the low-speed torque can be increased.
In the third embodiment, the entire configuration of the motorcycle 1 is the same as that of the first embodiment except for the arrangement configuration of the arrangement intake chamber 117, and the same components as those in the first embodiment are denoted by the same reference numerals. The description thereof will be omitted as appropriate.

As shown in FIG. 6, an intake chamber 117 is disposed in front of the head pipe 5. The vehicle body cover 31 is disposed so as to cover the main frame 3, the cylinder block 15, the cylinder head 16, the intake chamber 117, the intake pipe 19, and the throttle valve unit 20 from the side and from above.
The intake chamber 117 includes a chamber case 127, a case cover 128, and an air cleaner element 129. The chamber case 127 is disposed in front of the head pipe 5 with the opening 128c facing forward and upward. The air cleaner element 129 is sandwiched between the chamber case 127 and the case cover 128 so as to cover the opening 128c. As a result, the intake chamber 117 is partitioned into a dirty side 127B on the front side of the air cleaner element 129 and a clean side 127C on the rear side of the air cleaner element 129. An intake duct 132 for taking outside air into the intake chamber 117 is attached to the dirty side 127B. At the lower end of the intake duct 132, an opening 132A that opens downward is provided.

  As shown in FIG. 7, a bulging portion 128 </ b> B that bulges rearward is formed on the left side of the rear portion of the chamber case 127. A communication port 133 is formed on the rear surface of the bulging portion 128 </ b> B, and the intake pipe 19 is connected to the communication port 133. The intake pipe 119 sends the air from the clean side 127C purified by passing through the air cleaner element 129 to the engine 13 behind the vehicle. The intake pipe 119 includes a connecting tube 121 and an intake pipe 122. The upper end of the connecting tube 121 protrudes and opens into the clean side 127 </ b> C of the chamber case 127 through the communication port 133. On the other hand, the lower end of the connecting tube 121 is connected to the suction side of the throttle valve unit 20C. The upper side of the intake pipe 22 is connected to the discharge side of the throttle valve unit 20 </ b> C, and the lower part of the intake pipe 22 is connected to the intake port 18 of the cylinder head 16.

The connecting tube 121 passes through the left side of the head pipe 5, passes over the left front fork 6, and is positioned below the upper surface of the main frame 3 so as to follow the inclination of the main frame 3. It extends to the suction side of 20C. That is, a space is formed above the connecting tube 121 and the vehicle body cover 31.
The connecting tube 121 is also disposed substantially parallel to the main frame 3 and offset from the main frame 3 to the outside of the vehicle body from the intake chamber 117 to the vicinity of the engine 13 in a top view. The rear part of the connecting tube 121 is curved inward of the vehicle body.
The connecting tube 121 includes an empty box-shaped resonator 130 that communicates with the connecting tube 121 and is located approximately above the center. By providing the intake chamber 17 in front of the head pipe 5, the length of the intake pipe of the connecting tube 121 is increased, thereby increasing the intake noise. By attaching the resonator 130 to the connecting tube 121, the diameter of the connecting tube 121 is increased by the resonator 130, and the intake sound of the connecting tube 121 is reduced.

  The throttle valve unit 20C includes a throttle body 200, a gear box 210, and a valve drive motor 220. The throttle body 200 supports a butterfly type throttle valve 201. The motor rotation shaft 221 of the valve drive motor 220 and the valve rotation shaft 202 of the throttle valve 201 extend in the vertical direction of the vehicle body and are arranged in parallel to each other. The gear box 210 is a reduction gear that reduces the rotational speed of the rotational output generated by the valve drive motor 220 and transmits it to the throttle valve 201. The gear box 210 includes a first spur gear 211 attached to the motor shaft of the valve drive motor 220, a second spur gear 212 that meshes with the first spur gear 211, a third spur gear 213 that rotates together with the second spur gear 212, and a throttle valve. A fourth spur gear 214 that is attached to the valve rotation shaft 202 of the 201 and meshes with the third spur gear 213 is provided. The motor rotation shaft 221, the gear rotation shaft 215, and the valve rotation shaft 202 extend in the vertical direction of the vehicle body of the motorcycle 1 and are provided in parallel to each other.

The throttle valve unit 20 </ b> C is provided between the resonator 130 and the engine 13 in a top view, and the valve driving motor 220, the gear box 210, and the throttle body 200 are arranged along the shape of the connecting tube 121. That is, the throttle body 200 is provided below the main frame 3 at the rear portion of the connecting tube 121 curved to the inside of the vehicle body, and is offset from the main frame 3 toward the outside of the vehicle body in the order of the gear box 210 and the valve drive motor 220. Be placed. The valve drive motor 220 is disposed behind the resonator 130. Further, the valve drive motor 220 is disposed in the space above the connecting tube 121 formed in the vehicle body cover 31.
Although not shown, the valve drive motor 220 may be housed in the gear box case 219 and fixed to the main frame 3 as in the first embodiment.

  As described above, according to the present embodiment, the connecting tube 121 is disposed substantially parallel to the main frame 3 and offset from the main frame 3 to the outside of the vehicle body in plan view. A throttle body 200 that supports the throttle valve 201 is disposed, and the motor rotation shaft 221 of the valve drive motor 220 and the valve rotation shaft 202 of the throttle valve 201 extend in the vertical direction of the vehicle body and are parallel to each other, and the intake pipe 19 It was offset in the longitudinal direction outside the vehicle body. According to this configuration, it is possible to prevent the valve drive motor 220 from interfering with the main frame 3 of the vehicle, and to arrange the throttle body 200 close to the main frame 3 of the vehicle. The protrusion can be suppressed and the vehicle can be made compact.

  Further, the reduction gear 210 that meshes with the motor rotation shaft 221 of the valve drive motor 220 and the valve rotation shaft 202 of the throttle valve 201 and transmits the rotation of the valve drive motor 220 to the throttle valve 201 is represented by the reduction gear 210 and the valve drive motor 220. It was arranged toward the outside of the car body in this order. According to this configuration, the throttle body 200 can be disposed close to the main frame 3 of the vehicle by preventing interference between the valve drive motor 220 and the main frame 3 of the vehicle.

Further, a valve drive motor is disposed in a space formed in the vehicle body cover 31 above the connecting tube 121. According to this configuration, the valve drive motor 220 can be disposed along the vertical direction of the vehicle, and the protrusion of the valve drive motor to the outside in the vehicle width direction can be suppressed. Therefore, interference between the valve drive motor 220 and the occupant's feet can be avoided.
Further, the connecting tube 121 is provided with a resonator 130 for reducing the intake sound of the intake pipe 19 above the connecting tube 121, and a valve drive motor 220 is disposed behind the resonator 130. According to this configuration, even if solids such as stones or water can fly from the front of the resonator 130, the valve drive motor 220 can be protected by the resonator 130, and a protective member or the like is attached to the valve drive motor 220. Since there is no need, weight increase and cost increase can be suppressed.

  As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to this. In the present embodiment, the valve drive motor 220 and the gear box 210 are housed in the gear box case 219, and the gear box case 219 is fixed to the main frame 3 as an example. The motor 220 may be fixed to one place or a plurality of places by using a fixing member such as a bracket or a band without being housed in the case. In the present embodiment, a motorcycle is shown as an example. However, the present invention is not limited to this, and a configuration of a three-wheel or four-wheel straddle-type vehicle may be employed.

DESCRIPTION OF SYMBOLS 1 Motorcycle 3 Main frame 5 Head pipe 13 Engine 14 Crankcase 15 Cylinder block (cylinder)
16 Cylinder head 17, 117 Intake chamber 19, 119 Intake piping 20, 20 A, 20 C Throttle valve unit 21, 121 Connecting tube 22, 122 Intake pipe 27 c Rib 31 Body cover 129 Resonator 200 Throttle body 201 Throttle valve 202 Valve rotation shaft (rotation axis)
203 Throttle valve case 210, 21 Gear box (reduction gear)
215 Gear rotation shaft 216 Bearing 217 Bearing 219 Gear box 220 Valve drive motor 221 Motor rotation shaft 250 Flange B Recess

Claims (12)

A head pipe (5) for rotatably supporting the steering device;
A main frame (3) comprising one frame extending rearward and downward from the head pipe (5);
An engine (13) supported by the main frame (3) and having a crankcase (14), a cylinder (15) projecting forward from the crankcase (14), and a cylinder head (16);
An intake pipe (19, 119) extending from the upper part of the cylinder head (16) toward the front upper side;
A throttle valve (201) arranged in the middle of the intake pipe (19, 119) for adjusting the amount of air supplied to the engine (13);
In a saddle-ride type vehicle comprising: a valve drive motor (220) that drives the throttle valve (201) in response to an input from an operator operated by an occupant;
The rotary shaft (202) of the throttle valve (201) and the rotary shaft (221) of the valve drive motor (220) extend in the vertical direction of the vehicle body or in the longitudinal direction of the vehicle body and are provided in parallel with each other. Saddle type vehicle.   The straddle-type vehicle according to claim 1, wherein the valve drive motor (220) is disposed above the rotating shaft (202) of the throttle valve (201).   The straddle-type vehicle according to claim 2, wherein the valve drive motor (220) is arranged to overlap the main frame (3) in a side view.   The straddle-type vehicle according to claim 3, wherein the valve drive motor (220) is supported by the main frame (3). An intake chamber (17, 117) communicating with the intake pipe (19, 119) is provided on the upstream side of the intake pipe (19, 119),
The straddle-type vehicle according to claim 2, wherein the valve drive motor (220) is arranged to overlap the intake chamber (17, 117) in a side view.   The straddle-type vehicle according to claim 5, wherein the valve drive motor (220) is supported by the intake chamber (17, 117). The intake chamber (17, 117) includes a recess (B) on its side surface,
The straddle-type vehicle according to claim 5 or 6, wherein the valve drive motor (220) is disposed in the recess (B).   The said intake chamber (17, 117) is provided with the rib (27c) which covers the part of the said valve drive motor (220) projected outside from the said recessed part (B) from the front. Saddle type vehicle. The intake pipes (19, 119) are arranged substantially parallel to the main frame (3) and offset from the main frame (3) to the outside of the vehicle body in plan view,
A throttle body (200) that supports the throttle valve (201) is disposed under the main frame (3), and a rotary shaft (221) of the valve drive motor (220) and a rotary shaft of the throttle valve (201). (202) and extending in the vertical direction of the vehicle body, parallel to each other, and offset to the outside of the vehicle body in the length direction of the intake pipe (19, 119). The saddle riding type vehicle described.   A reduction gear that meshes with the rotation shaft (221) of the valve drive motor (220) and the rotation shaft (202) of the throttle valve (201) and transmits the rotation of the valve drive motor (220) to the throttle valve (201). The straddle-type vehicle according to claim 9, wherein the gears (21, 210) are arranged in the order of the reduction gears (21, 210) and the valve drive motor (220) toward the outside of the vehicle body.   The straddle-type vehicle according to claim 9 or 10, wherein the valve drive motor (220) is arranged in a space above the intake pipe (19, 119).   The intake pipe (19, 119) includes a resonator (129) for reducing the intake noise of the intake pipe (19, 119) above the intake pipe (19, 119), and is located behind the resonator (129). The straddle-type vehicle according to any one of claims 9 to 11, wherein the valve drive motor (220) is arranged.

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