EP4080029A1

EP4080029A1 - Straddled vehicle

Info

Publication number: EP4080029A1
Application number: EP22157051.8A
Authority: EP
Inventors: Tsubasa Konya
Original assignee: Yamaha Motor Co Ltd
Current assignee: Yamaha Motor Co Ltd
Priority date: 2021-04-23
Filing date: 2022-02-16
Publication date: 2022-10-26
Also published as: JP2022167406A

Abstract

There is disclosed a straddled vehicle (1) including a body frame (3), an engine (11), a throttle device (41), an ignition device (61), and a supporting portion (81). The engine (11) includes a cylinder head (26), and a head cover (29). The throttle device (41) is located behind the cylinder head (26). The throttle device (41) includes a magnetic sensor (46). The ignition device (61) includes a spark plug (63), and an ignition coil (67). The spark plug (63) is attached to the cylinder head (26). At least part of the ignition coil (67) is located in front of a cylinder axis (B) in side view of the vehicle. The ignition coil (67) includes a flange (73). The supporting portion (81) supports the ignition coil (67). The supporting portion (81) is supported by the head cover (29). The supporting portion (81) electrically connects the head cover (29) to the flange (73).

Description

This invention relates to a straddled vehicle provided with an ignition coil.
Japanese Unexamined Patent Publication No. 2011-196218A discloses a two-wheeled motor vehicle. The two-wheeled motor vehicle includes a body frame and an engine. The engine is fixed to the body frame.
The engine includes a cylinder member, a cylinder head, and a head cover. The cylinder head is provided above the cylinder member. The head cover is provided above the cylinder head.
The two-wheeled motor vehicle includes an intake pipe. The intake pipe is connected to the cylinder head. The intake pipe includes a throttle device. The throttle device is located behind the cylinder head.
The two-wheeled motor vehicle includes an ignition device. The ignition device includes a spark plug, a plug cord, and an ignition coil. The spark plug is attached to the cylinder head. The plug cord is connected to the spark plug. The ignition coil is connected to the plug cord.
The ignition coil includes a casing, a secondary terminal, and a flange. The secondary terminal is attached to the casing. The secondary terminal is connected to the plug cord. The flange is attached to the casing.
The two-wheeled motor vehicle includes a supporting portion. The supporting portion supports the ignition coil. The supporting portion is connected to the flange. The supporting portion is supported by the body frame. Accordingly, the ignition coil is supported by the body frame via the supporting portion. The supporting portion is not supported by the engine. Accordingly, the ignition coil is not supported by the engine.
The ignition coil is located in front of the head cover. More specifically, the ignition coil is entirely located more forward than a front end of the head cover.
As described above, in the straddled vehicle whose engine is fixed to the body frame, the currently-used ignition coil is not supported by the engine. In the technical field of the straddled vehicle with engine fixed to the body frame, it is currently considered that the body frame preferably supports the ignition coil. That is because the ignition coil does not easily undergo heat and vibration of the engine. That is because the heat and vibration of the engine are not easily transferred to the ignition coil.
The Inventor studied that the ignition device is arranged more appropriately. The present invention has been made regarding the state of the art noted above, and its object is to provide a straddled vehicle that allows more appropriate arrangement of an ignition device.
The Inventor studied as under to arrange the ignition device more appropriately.
First of all, the Inventor found that vibration of a body frame differs from vibration of an engine. Firstly, the vibration of the body frame is weaker than the vibration of the engine. For example, an amplitude of the vibration of the body frame is smaller than an amplitude of the vibration of the engine. Secondly, the vibration of the body frame deviates from the vibration of the engine. For example, a period of the vibration of the body frame differs from a period of the vibration of the engine. For example, a frequency of the vibration of the body frame differs from a frequency of the vibration of the engine. For example, a phase of the vibration of the body frame is shifted from a phase of the vibration of the engine.
The Inventor found, based on the above finding, that vibration of an ignition coil differs from vibration of a spark plug. As described above, the ignition coil is supported by the body frame in the traditional art. Accordingly, the ignition coil receives the vibration of the body frame. As described above, the spark plug is conventionally attached to the engine. Accordingly, the spark plug receives the vibration of the engine. As described above, the vibration of the body frame differs from the vibration of the engine. Accordingly, the vibration transferred to the ignition coil differs from the vibration transferred to the spark plug. This generates difference in vibration between the ignition coil and the spark plug in the traditional art.
Then, the Inventor studied for suppressing the difference in vibration between the ignition coil and the spark plug. The difference in vibration between the ignition coil and the spark plug corresponds to a difference between the vibration of the ignition coil and the vibration of the spark plug.
Here, a throttle device includes a throttle valve and a magnetic sensor. The magnetic sensor detects a position of the throttle valve. Specifically, the magnetic sensor detects the position of the throttle valve by sensing a magnetic field.
Then, the Inventions found that the ignition device may affect a detection accuracy of the magnetic sensor.
Firstly, the ignition coil may affect the magnetic field sensed by the magnetic sensor. That is because the ignition coil is a high voltage component that generates high voltages. For example, the ignition coil may distort the magnetic field sensed by the magnetic sensor. For example, the ignition coil may form a disturbance magnetic field for the magnetic sensor. The detection accuracy of the magnetic sensor is reduced when the ignition coil significantly affects the magnetic field sensed by the magnetic sensor.
Secondly, radio noise emitted from the ignition device may also affect the magnetic field sensed by the magnetic sensor. That is because the ignition device is a source of the radio noise. For example, the radio noise emitted from the ignition device may distort the magnetic field sensed by the magnetic sensor. For example, the radio noise emitted from the ignition device may form a disturbance magnetic field for the magnetic sensor. The detection accuracy of the magnetic sensor is reduced when the radio noise from the ignition device significantly affects the magnetic field sensed by the magnetic sensor.
Then, the Inventor paid attention to protection of the magnetic sensor from the ignition coil. Here, the protection of the magnetic sensor from the ignition coil corresponds to protection of the magnetic field, sensed by the magnetic sensor, from the ignition coil. Moreover, the Inventor paid additional attention to protection of the magnetic sensor from radio noise of the ignition device. Here, the protection of the magnetic sensor from the radio noise of the ignition device corresponds to protection of the magnetic field, sensed by the magnetic sensor, from the radio noise of the ignition device.
In summary, the Inventor studied the straddled vehicle in which the ignition device can be installed more appropriately. More specifically, the Inventor studied installation of the ignition device that can suppress the difference in vibration between the ignition coil and the spark plug, and can protect the magnetic sensor from the ignition coil as well as from the radio noise of the ignition device.
Based on the above findings and study, this invention provides the following construction. A straddled vehicle, according to this invention, includes:

a body frame;
an engine fixed to the body frame;
a throttle device configured to control an intake air amount of the engine;
an ignition device including a spark plug, a plug cord connected to the spark plug, and an ignition coil connected to the plug cord; and
a supporting portion configured to support the ignition coil;
the engine including:
- a cylinder member having a cylinder bore centering on a cylinder axis;
- a cylinder head provided above the cylinder member; and
- a head cover provided above the cylinder head,
the throttle device being located behind the cylinder head,
the throttle device including:
- a throttle valve; and
- a magnetic sensor configured to detect a position of the throttle valve;
the spark plug being attached to the cylinder head,
the ignition coil including:
- a casing;
- a secondary terminal attached to the casing and connected to the plug cord; and
- a flange attached to the casing and connected to the supporting portion; the supporting portion being supported by the head cover,
at least part of the ignition coil being located in front of the cylinder axis in side view of the straddled vehicle, and
the supporting portion electrically connecting the head cover to the flange.

The straddled vehicle includes the body frame and the engine. The engine is fixed to the body frame. The engine includes the cylinder member, the cylinder head, and the head cover. The cylinder member includes the cylinder bore. The cylinder bore centers on the cylinder axis. The cylinder axis is an imaginary straight line. The cylinder head is provided above the cylinder member. The head cover is provided above the cylinder head.
The straddled vehicle includes the throttle device. The throttle device controls an intake air amount of the engine. The throttle device is located behind the cylinder head. The throttle device includes the throttle valve and the magnetic sensor. The magnetic sensor detects the position of the throttle valve.
The straddled vehicle includes the ignition device. The ignition device includes the spark plug, the plug cord, and the ignition coil. The spark plug is attached to the cylinder head. The plug cord is connected to the spark plug. The ignition coil is connected to the plug cord.
The ignition coil includes a casing, a secondary terminal, and a flange. The secondary terminal is attached to the casing. The secondary terminal is connected to the plug cord. The flange is attached to the casing.
The straddled vehicle includes the supporting portion. The supporting portion supports the ignition coil. The supporting portion is connected to the flange. The supporting portion is supported by the head cover. Accordingly, the ignition coil is supported by the head cover via the supporting portion. As described above, the spark plug is attached to the cylinder head. Accordingly, the ignition coil and the spark plug are both supported by the engine. This can effectively suppress a difference in vibration between the ignition coil and the spark plug. That is, a difference between vibration of the ignition coil and vibration of the spark plug can be suppressed effectively. Accordingly, the ignition device can be installed more appropriately.
The head cover is lower in temperature than the cylinder member and the cylinder head. Accordingly, the ignition coil can be protected suitably from the heat of the engine. This can install the ignition device more appropriately.
As described above, the throttle device is located behind the cylinder head. At least part of the ignition coil is located in front of the cylinder axis in the side view of the straddled vehicle. Accordingly, the magnetic sensor can be sufficiently spaced apart from the ignition coil. In other words, a separation distance between the magnetic sensor and the ignition coil can be obtained appropriately. This can protect the magnetic sensor from the ignition coil suitably. That is, the magnetic field sensed by the magnetic sensor can be protected from the ignition coil suitably. Consequently, the magnetic sensor can detect the position of the throttle valve accurately.
The supporting portion electrically connects the head cover to the flange. Accordingly, the radio noise emitted by the ignition device is reduced effectively. This can protect the magnetic sensor from the radio noise of the ignition device suitably. That is, the magnetic field sensed by the magnetic sensor can be protected from the radio noise of the ignition device suitably. Consequently, the magnetic sensor can detect the position of the throttle valve more accurately.
Here, it is presumed that the radio noise emitted from the ignition device is reduced effectively because a current loop containing the ignition device becomes small effectively. Specifically, current flows from the ignition coil through the plug cord to the spark plug. The current flows from the spark plug to the engine. Then, the current returns from the engine through the supporting portion to the ignition coil. In such a manner as above, the current loop is a path of the current that flows in the ignition coil, the plug cord, the spark plug, the engine, the supporting portion, and the ignition coil in this order. More specifically, the current loop is a path of the current that flows in the ignition coil, the plug cord, the spark plug, the cylinder head, the head cover, the supporting portion, and the ignition coil in this order. Here, the current loop does not contain the body frame. That is because the supporting portion electrically connects the head cover to the flange. That is because the supporting portion electrically connects the engine to the ignition coil. Since the current loop does not contain the body frame, the current loop becomes small effectively. Specifically, an area surrounded by the current loop becomes small effectively. Accordingly, the radio noise emitted from the ignition device is reduced effectively.
In summary, first of all, the engine is fixed to the body frame, the ignition coil is supported by the head cover of the engine, and the spark plug is attached to the cylinder head. Consequently, in the straddled vehicle whose engine is fixed to the body frame, the difference in vibration between the ignition coil and the spark plug can be suppressed suitably. Moreover, the ignition coil can be protected suitably from the heat of the engine. This results in more suitable installation of the ignition device. Secondly, the throttle device is located behind the cylinder head, and at least part of the ignition coil is located in front of the cylinder axis in the side view of the straddled vehicle. Accordingly, the magnetic sensor can be sufficiently spaced apart from the ignition coil. This results in suitable protection of the magnetic sensor from the ignition coil. Thirdly, the supporting portion electrically connects the flange to the head cover. This effectively reduces the radio noise radiated from the ignition device. This results in suitable protection of the magnetic sensor from the radio noise of the ignition device.
As described above, with the straddled vehicle according to the present invention, the ignition device can be installed more appropriately. Specifically, with the straddled vehicle according to the present invention, the difference in vibration between the ignition coil and the spark plug can be suppressed, and the magnetic sensor can be protected from the ignition coil as well as from the radio noise of the ignition device.
It is preferred in the straddled vehicle described above that the ignition coil is entirely located in front of the cylinder axis in the side view of the straddled vehicle. This can sufficiently obtain the separation distance between the ignition coil and the magnetic sensor.
It is preferred in the straddled vehicle described above that the throttle device is entirely located behind the cylinder axis in the side view of the straddled vehicle. This can suitably obtain the separation distance between the ignition coil and the magnetic sensor.
It is preferred in the straddled vehicle described above that at least part of the ignition coil is located more rearward than a front end of the head cover. Accordingly, the ignition coil is located near the head cover. Consequently, the head cover can support the ignition coil suitably.
Moreover, the throttle device is located behind the cylinder head, at least part of the ignition coil is located in front of the cylinder axis in the side view of the straddled vehicle, and at least part of the ignition coil is located more rearward than the front end of the head cover. Accordingly, the ignition coil is not too close to the magnetic sensor and not too far from the spark plug. In other words, the current loop is made as small as possible while the separation distance between the ignition coil and the magnetic sensor is obtained sufficiently. This can protect the magnetic sensor from the ignition coil while protecting the magnetic sensor from the radio noise of the ignition device. This results in achievement in a high level both the protection of the magnetic sensor from the ignition coil and the protection of the magnetic sensor from the radio noise of the ignition device.
It is preferred in the straddled vehicle described above that the ignition coil is entirely located more rearward than a front end of the head cover. The head cover can support the ignition coil more suitably. Moreover, it is possible to achieve both the protection of the magnetic sensor from the ignition coil and the protection of the magnetic sensor from the radio noise of the ignition device in a much higher level.
It is preferred in the straddled vehicle described above that, in the side view of the straddled vehicle, the ignition coil overlaps a first imaginary line that passes a front end of the head cover and is parallel to an up-down direction of the straddled vehicle. The ignition coil overlaps the first imaginary line in the side view of the straddled vehicle. Here, the first imaginary line passes the front end of the head cover, and is parallel to the up-down direction of the straddled vehicle. Accordingly, the head cover can support the ignition coil more suitably. Moreover, it is possible to achieve both the protection of the magnetic sensor from the ignition coil and the protection of the magnetic sensor from the radio noise of the ignition device in a much higher level.
It is preferred in the straddled vehicle described above that at least part of the ignition coil is located above the head cover, and overlaps the head cover in plan view of the straddled vehicle. The head cover can support the ignition coil more suitably.
It is preferred in the straddled vehicle described above that at least part of the ignition coil is located higher than the throttle device. The magnetic sensor can be spaced apart from the ignition coil easily.
It is preferred in the straddled vehicle described above that at least part of the ignition coil is located higher than an upper end of the head cover, and at least part of the throttle device is located lower than the upper end of the head cover. This can protect the ignition coil from the heat of the engine suitably. Moreover, this can easily obtain the separation distance between the ignition coil and the magnetic sensor.
It is preferred in the straddled vehicle described above that the ignition coil is entirely located more forward than the spark plug, and the throttle device is entirely located more rearward than the spark plug. The current loop is formed more forward than the spark plug. The current loop extends forward from the spark plug. The throttle device is located more rearward than the current loop. The throttle device is entirely located more rearward than the current loop. This can protect the magnetic sensor from the radio noise of the ignition device suitably.
It is preferred in the straddled vehicle described above that the throttle device is entirely located more rearward than the ignition device. This can protect the magnetic sensor from the radio noise of the ignition device suitably.
It is preferred in the straddled vehicle described above that the ignition coil is entirely located higher than the spark plug, and at least part of the throttle device is located higher than the spark plug. This can arrange the ignition coil, the spark plug, and the throttle device at appropriate positions.
It is preferred in the straddled vehicle described above that the spark plug overlaps the cylinder axis in the side view of the straddled vehicle. The spark plug can be positioned near the ignition coil. This further reduces the size of the current loop. Accordingly, the radio noise from the ignition device is further reduced.
It is preferred in the straddled vehicle described above that the spark plug is entirely located in front of an extension of a rear edge of the cylinder bore in the side view of the straddled vehicle. This can easily reduce the size of the current loop. Accordingly, the radio noise of the ignition device can be reduced suitably. This results in more suitable protection of the magnetic sensor from the radio noise of the ignition device.
Here, the extension is an imaginary straight line obtained by extending the rear edge of the cylinder bore. The extension is parallel to the cylinder axis. The extension is located at a position where the cylinder axis is shifted rearward.
It is preferred in the straddled vehicle described above that the ignition coil is entirely located in front of the extension of the rear edge of the cylinder bore in the side view of the straddled vehicle. The magnetic sensor can be protected from the radio noise of the ignition device more suitably. The magnetic sensor can be protected from the ignition coil more suitably.
It is preferred in the straddled vehicle described above that the throttle device is entirely located behind the extension of the rear edge of the cylinder bore in the side view of the straddled vehicle. The magnetic sensor can be protected from the radio noise of the ignition device more suitably.
It is preferred in the straddled vehicle described above that the ignition coil is entirely located at one of a right area rightward of the cylinder axis and a left area leftward of the cylinder axis in the plan view of the straddled vehicle, and the spark plug is entirely located at the other of the right area and the left area in the plan view of the straddled vehicle. This can bend the plug cord relatively gently. For example, the plug cord can be bent at a relatively low curvature. For example, the plug cord can be bent at a relatively large radius of curvature. Accordingly, the plug cord can be laid easily.
It is preferred in the straddled vehicle described above that the supporting portion extends upward and forward from the head cover. The supporting portion can support the ignition coil suitably.
It is preferred in the straddled vehicle described above that at least part of the supporting portion overlaps the head cover in the plan view of the straddled vehicle. The head cover can support the supporting portion suitably. Consequently, the supporting portion can support the ignition coil suitably.
It is preferred in the straddled vehicle described above that the supporting portion contacts the head cover. The supporting portion can electrically connect the head cover (engine) to the ignition coil suitably.
It is preferred in the straddled vehicle described above that the supporting portion contacts the flange. The supporting portion can electrically connect the head cover (engine) to the ignition coil suitably.
It is preferred in the straddled vehicle described above that the supporting portion includes a boss connected to the head cover, and a fastening portion configured to fasten the flange to the boss, and that the boss electrically connects the head cover to the flange. The supporting portion can electrically connect the engine to the ignition coil suitably while supporting the ignition coil suitably.
It is preferred in the straddled vehicle described above that the cylinder axis extends upward and forward at an angle of 45 degrees or more with respect to a horizontal line in the side view of the straddled vehicle. The cylinder axis is closer to a vertical line than the horizontal line. Consequently, the present invention is suitably applicable to the engine having the cylinder axis that is closer to the vertical line than the horizontal line.
It is preferred in the straddled vehicle described above that the body frame includes a main frame connected to the engine, and that at least part of the main frame is located above the engine and the ignition device in the side view of the straddled vehicle. As described above, the current loop does not contain the body frame. Accordingly, the current loop can be reduced in size suitably even when at least part of the main frame is located above the engine and the ignition device in the side view of the straddled vehicle. Consequently, the magnetic sensor can be protected from the radio noise of the ignition device suitably.
It is preferred in the straddled vehicle described above that the throttle device includes a throttle body configured to accommodate the throttle valve, and that the throttle body contacts the cylinder head. Accordingly, the throttle body is positioned near the cylinder head (engine). This achieves suitably enhanced performance of the engine.
For the purpose of illustrating the invention, there are shown in the drawings several forms which are presently preferred, it being understood, however, that the invention is not limited to the precise arrangement and instrumentalities shown.

Fig. 1 is a right side view of a straddled vehicle according to an embodiment.
Fig. 2 is a right side view of a body frame and an engine.
Fig. 3 is a plan view of the body frame and the engine.
Fig. 4 is a left side view of the engine.
Fig. 5 is a sectional view of the engine.
Fig. 6 is a front view of the engine.
Fig. 7 is a perspective view of an ignition coil.
Fig. 8 is a sectional view of a supporting portion.
Fig. 9 schematically shows a current loop in the straddled vehicle according to the present embodiment.
Fig. 10 schematically shows a current loop in a straddled vehicle according to a comparative example.

A straddled vehicle 1 according to this invention will be described hereinafter with reference to the drawings.
Fig. 1 is a right side view of a straddled vehicle 1 according to one embodiment. The straddled vehicle 1 is a dual purpose vehicle, for example. The straddled vehicle 1 is also called a dual-sport motorcycle.
Fig. 1 shows a longitudinal direction X, a transverse direction Y, and an up-down direction Z of the straddled vehicle 1. The longitudinal direction X, transverse direction Y, and up-down direction Z are defined with reference to a driver (also called a rider) mounted on the straddled vehicle 1. The longitudinal direction X, transverse direction Y, and up-down direction Z are perpendicular to one another. The longitudinal direction X and transverse direction Y are horizontal. The up-down direction Z is vertical.
The terms "forward", "rearward", "upward", "downward", "rightward", and "leftward", respectively, mean "forward", "rearward", "upward", "downward", "rightward", and "leftward" as seen from the driver mounted on the straddled vehicle 1. Unless otherwise stated in this specification, "forward" and "rearward" include not only directions parallel to the longitudinal direction X but also directions close to the longitudinal direction X. The directions close to the longitudinal direction X are, for example, directions at angles not exceeding 45 degrees to the longitudinal direction X. Similarly, unless otherwise specified, "rightward" and "leftward" include not only directions parallel to the transverse direction Y but also directions close to the transverse direction Y. Unless otherwise specified, "upward" and "downward" include not only directions parallel to the up-down direction Z but also directions close to the up-down direction Z. For reference, the drawings show the terms FRONT, REAR, UP, DOWN, RIGHT, and LEFT, as appropriate.
It is to be understood that, in this specification, various expressions describing arrangements have the following meanings, respectively. The following description will be made taking the transverse direction Y for example, and the same may be applied to the longitudinal direction X and up-down direction Z.
The expression "Member Ma is located more rightward/leftward than Member Mb," defines a position in the transverse direction Y of Member Ma relative to Member Mb, and does not define a position in the longitudinal direction X or the up-down direction Z of Member Ma relative to Member Mb. In the case of this expression, Member Ma may, or may not, overlap Member Mb in a side view of the straddled vehicle 1.
The expression "Member Ma is located rightward/leftward of Member Mb," without reference to a looking direction defines a position in the transverse direction Y of Member Ma relative to Member Mb, a position in the longitudinal direction X of Member Ma relative to Member Mb, and a position in the up-down direction Z of Member Ma relative to Member Mb. This expression means that Member Ma is located more rightward/leftward than Member Mb, and that at least part of Member Ma overlaps at least part of Member Mb in a side view of the straddled vehicle 1.
The expression "Member Ma is located rightward/leftward of Member Mb in plan view of the straddled vehicle 1," defines a position in the transverse direction Y of Member Ma relative to Member Mb, and a position in the longitudinal direction X of Member Ma relative to Member Mb, and does not define a position in the up-down direction Z of Member Ma relative to Member Mb. This expression means that Member Ma is located more rightward/leftward than Member Mb, and that a front end of Member Ma is located more forward than a rear end of Member Mb, and that a rear end of Member Ma is located more rearward than a front end of Member Mb.
The expression "Member Ma is located rightward/leftward of Member Mb in front view of the straddled vehicle 1," defines a position in the transverse direction Y of Member Ma relative to Member Mb, and a position in the up-down direction Z of Member Ma relative to Member Mb, and does not define a position in the longitudinal direction X of Member Ma relative to Member Mb. This expression means that: Member Ma is located more rightward/leftward than Member Mb, an upper end of Member Ma is located higher than a lower end of Member Mb, and a lower end of Member Ma is located lower than an upper end of Member Mb.
In the present specification, the language "in side view of the straddled vehicle 1" is referred to as "in side view of the vehicle", as appropriate. Likewise, the language "in plan view of the straddled vehicle 1" is referred to as "in plan view of the vehicle", as appropriate. The language "in front view of the straddled vehicle 1" is referred to as "in front view of the vehicle", as appropriate.
The straddled vehicle 1 includes a body frame 3, and a steering device 7. The steering device 7 is supported by the body frame 3. The steering device 7 is rotatable relative to the body frame 3.
The steering device 7 includes an accelerator grip 8.
The straddled vehicle 1 includes a front wheel 9. The front wheel 9 is supported by the steering device 7.
The straddled vehicle 1 includes an engine 11. The engine 11 is supported by the body frame 3. The engine 11 is fixed to the body frame 3. The engine 11 is unrockable relative to the body frame 3.
The straddled vehicle 1 includes an engine fastening portion 13. The engine fastening portion 13 fastens the engine 11 to the body frame 3. The engine fastening portion 13 is a bolt, for example. Accordingly, the engine 11 is immovable relative to the body frame 3.
Here, the engine 11 is fastened to the body frame 3 at a plurality of positions in addition to the position of the engine fastening portion 13 shown in Fig. 1.
The straddled vehicle 1 includes a seat 15. The seat 15 is located behind the steering device 7 in the side view of the vehicle.
The straddled vehicle 1 includes a rear arm 17. The rear arm 17 is located behind the engine 11 in the side view of the vehicle. The rear arm 17 is supported by the body frame 3. The rear arm 17 is swingable relative to the body frame 3.
The straddled vehicle 1 includes a rear wheel 19. The rear wheel 19 is supported by the rear arm 17.
The driver of the straddled vehicle 1 sits astride the seat 15. The driver steers the steering device 7. The driver operates the accelerator grip 8.
Fig. 2 is a right side view of the body frame 3 and the engine 11. The body frame 3 includes a head tube 4. The head tube 4 is located higher and more forward than the engine 11 in the side view of the vehicle. The head tube 4 supports the steering device 7.
The body frame 3 includes a main frame 5. The main frame 5 is connected to the head tube 4. The main frame 5 extends rearward and downward from the head tube 4.
At least part of the main frame 5 is located above the engine 11 in the side view of the vehicle. The main frame 5 may or may not overlap the engine 11 in the side view of the vehicle.
The main frame 5 passes a position above the engine 11, and extends from a position more forward than the engine 11 to a position more rearward than the engine 11 in the side view of the vehicle.
The main frame 5 is coupled to the engine 11. The main frame 5 fixes the engine 11. The engine fastening portion 13 fastens the main frame 5 to the engine 11.
Fig. 3 is a plan view of the body frame 3 and the engine 11. Fig. 3 shows the main frame 5 with dotted lines. The main frame 5 extends from a position more forward than the engine 11 to a position more rearward than the engine 11 in the plan view of the vehicle.
The main frame 5 includes a right main frame 5R and a left main frame 5L. The left main frame 5L is located leftward of the right main frame 5R.
At least part of the engine 11 is located leftward of the right main frame 5R in the plan view of the vehicle. At least part of the engine 11 is located rightward of the left main frame 5L in the plan view of the vehicle.
The right main frame 5R extends from a position more forward than the engine 11 to a position more rearward than the engine 11 in the plan view of the vehicle. The left main frame 5L extends from a position more forward than the engine 11 to a position more rearward than the engine 11 in the plan view of the vehicle.
The right main frame 5R is shown in Fig. 2. The left main frame 5L overlaps the right main frame 5R in the side view of the vehicle, which illustration is omitted.
Reference is now made to Figs. 2 to 4. Fig. 4 is a left side view of the engine 11.
The engine 11 includes a crankcase 21. The crankcase 21 accommodates a crankshaft not shown. The crankcase 21 is fastened to the body frame 3 by the engine fastening portion 13.
The engine 11 includes a cylinder unit 22. The cylinder unit 22 is provided above the crankcase 21. The cylinder unit 22 is connected to the crankcase 21.
The cylinder unit 22 extends forward and upward.
The cylinder unit 22 extends along a cylinder axis B. The cylinder axis B is an imaginary straight line. The cylinder axis B extends forward and upward in the side view of the vehicle.
Reference is made to Fig. 2. The cylinder axis B forms an angle θ with respect to a horizontal line H in the side view of the vehicle. The angle θ is 45 degrees or larger. The horizontal line H is an imaginary line that is parallel to the longitudinal direction X in the side view of the vehicle.
Reference is made to Fig. 3. The cylinder axis B is parallel to the longitudinal direction X in the plan view of the vehicle.
The cylinder axis B is located leftward of the right main frame 5R in the plan view of the vehicle. The cylinder axis B is located rightward of the left main frame 5L in the plan view of the vehicle.
Reference is now made to Figs. 2 to 4. The cylinder unit 22 includes a cylinder member 23, a cylinder head 26, and a head cover 29. The cylinder head 26 is provided above the cylinder member 23. The head cover 29 is provided above the cylinder head 26.
The cylinder member 23 is connected to the crankcase 21.
The cylinder head 26 is connected to the cylinder member 23. The head cover 29 is connected to the cylinder head 26.
Fig. 5 is a sectional view of the engine 11. Fig. 5 is a sectional view taken on a plane orthogonal to a transverse direction Y. The cylinder head 26 contacts the cylinder member 23. The head cover 29 contacts the cylinder head 26. The cylinder member 23 contacts the crankcase 21, which illustration is omitted.
The cylinder member 23 has a cylinder bore 24. The cylinder bore 24 is a space. The cylinder bore 24 is formed inside the cylinder member 23. The cylinder bore 24 extends on the cylinder axis B. The cylinder bore 24 centers on the cylinder axis B. The cylinder bore 24 is of a cylindrical shape.
The engine 11 includes a piston 31. The piston 31 is accommodated in the cylinder member 23. The piston 31 is located in the cylinder bore 24. The piston 31 is coupled to the crankshaft described above.
The cylinder head 26 covers an upper part of the cylinder bore 24. The cylinder member 23, the piston 31, and the cylinder head 26 define a combustion chamber 25. The combustion chamber 25 corresponds to a part of the cylinder bore 24 positioned higher than the piston 31.
The cylinder head 26 has an intake passage 27. The intake passage 27 is a space. The intake passage 27 is formed inside the cylinder head 26. The intake passage 27 is in communication with the combustion chamber 25. The intake passage 27 supplies fuel-air mixture to the combustion chamber 25.
The intake passage 27 is located above the combustion chamber 25. The intake passage 27 is located more rearward than the cylinder axis B in the side view of the vehicle. The intake passage 27 extends rearward from the combustion chamber 25. The intake passage 27 extends to a rear part of the cylinder head 26. Here, the rear part of the cylinder head 26 is a region of the cylinder head 26 positioned behind the cylinder axis B.
The cylinder head 26 includes an exhaust passage 28. The exhaust passage 28 is a space. The exhaust passage 28 is formed inside the cylinder head 26. The exhaust passage 28 is in communication with the combustion chamber 25. The exhaust passage 28 discharges combustion gas from the combustion chamber 25.
The exhaust passage 28 is located above the combustion chamber 25. The exhaust passage 28 is located more forward than the intake passage 27. The exhaust passage 28 is located more forward than the cylinder axis B in the side view of the vehicle. The exhaust passage 28 extends forward from the combustion chamber 25. The exhaust passage 28 extends to a front part of the cylinder head 26. Here, the front part of the cylinder head 26 is a region of the cylinder head 26 positioned in front of the cylinder axis B.
The cylinder unit 22 includes an inlet valve 33 and an exhaust valve 34. The inlet valve 33 is located in the intake passage 27. The inlet valve 33 opens and closes the intake passage 27. The exhaust valve 34 is located in the exhaust passage 28. The exhaust valve 34 opens and closes the exhaust passage 28.
Reference is made to Figs. 2 to 5. The straddled vehicle 1 includes a throttle device 41. The throttle device 41 controls an intake air amount of the engine 11.
The throttle device 41 is located behind the cylinder head 26. For example, the throttle device 41 is entirely located behind the cylinder head 26. The throttle device 41 overlaps cylinder head 26 in rear view of the vehicle, which illustration is omitted.
The throttle device 41 is connected to the cylinder head 26. The throttle device 41 is connected to the rear part of the cylinder head 26. The throttle device 41 extends rearward from the cylinder head 26.
The throttle device 41 is located more rearward than the head cover 29. For example, the throttle device 41 is entirely located more rearward than the head cover 29.
The throttle device 41 is connected to an air cleaner, not shown, for example. The throttle device 41 controls an amount of air to be fed from the air cleaner to the engine 11.
Reference is made to Fig. 2. At least part of the throttle device 41 is located below the main frame 5 in the side view of the vehicle. In other words, at least part of the main frame 5 is located above the throttle device 41 in the side view of the vehicle. The throttle device 41 may or may not overlap the main frame 5 in the side view of the vehicle.
The main frame 5 extends from a position more forward than the throttle device 41 to a position more rearward than the throttle device 41 in the side view of the vehicle. More specifically, the main frame 5 passes a position above the throttle device 41, and extends from a position more forward than the throttle device 41 to a position more rearward than the throttle device 41 in the side view of the vehicle. The main frame 5 extends from a position more forward and higher than the throttle device 41 to a position more rearward and lower than the throttle device 41 in the side view of the vehicle. The engine fastening portion 13 is located more rearward and lower than the throttle device 41.
The throttle device 41 is entirely located behind the cylinder axis B in the side view of the vehicle. In other words, the throttle device 41 is entirely located more rearward than the cylinder axis B in the side view of the vehicle.
Reference is made to Fig. 3. The main frame 5 extends from a position more forward than the throttle device 41 to a position more rearward than the throttle device 41 in the plan view of the vehicle.
The right main frame 5R is located rightward of the throttle device 41 in the plan view of the vehicle. The right main frame 5R passes a position rightward of the throttle device 41, and extends from a position more forward than the throttle device 41 to a position more rearward than the throttle device 41 in the plan view of the vehicle. The left main frame 5L is located leftward of the throttle device 41 in the plan view of the vehicle. The left main frame 5L passes a position leftward of the throttle device 41, and extends from a position more forward than the throttle device 41 to a position more rearward than the throttle device 41 in the plan view of the vehicle.
The throttle device 41 is located on the cylinder axis B in the plan view of the vehicle.
Reference is made to Fig. 4. The head cover 29 has an upper end 29a. At least part of the throttle device 41 is located lower than the upper end 29a of the head cover 29. For example, the throttle device 41 is entirely located lower than the upper end 29a.
Reference is made to Fig. 5. The throttle device 41 contacts the cylinder head 26. The throttle device 41 is connected in communication with the intake passage 27.
The cylinder bore 24 has a rear edge 24a in the side view of the vehicle. Fig. 5 shows an extension E. Here, the extension E corresponds to an imaginary line obtained by extending the rear edge 24a of the cylinder bore 24. The extension E is parallel to the cylinder axis B. The extension E is located at a position where the cylinder axis B is shifted rearward. The throttle device 41 is entirely located behind the extension E in the side view of the vehicle. The throttle device 41 is entirely located more rearward than the extension E in the side view of the vehicle.
The throttle device 41 includes a throttle body 42. The throttle body 42 is connected to the cylinder head 26. The throttle body 42 contacts the cylinder head 26.
The throttle body 42 includes an intake passage 43. The intake passage 43 is a space. The intake passage 43 is formed inside the throttle body 42. The intake passage 43 is in communication with the intake passage 27.
The throttle device 41 includes a throttle valve 44. The throttle valve 44 is accommodated in the throttle body 42. The throttle valve 44 is located in the intake passage 43.
The throttle valve 44 is supported by the throttle body 42. The throttle valve 44 is movable relative to the throttle body 42. The throttle valve 44 opens and closes the intake passage 43. The throttle valve 44 changes a sectional area of the intake passage 43. The throttle valve 44 changes an amount of air flowing through the intake passage 43.
The throttle valve 44 is a butterfly valve, for example. The throttle valve 44 is rotatable relative to the throttle body 42, for example. Rotation of the throttle valve 44 changes the sectional area of the intake passage 43.
The throttle device 41 includes a valve shaft 45, for example. The valve shaft 45 is supported by the throttle body 42. The valve shaft 45 is movable relative to the throttle body 42. The valve shaft 45 supports the throttle valve 44. The throttle valve 44 rotates integrally with the valve shaft 45. The throttle valve 44 rotates when the valve shaft 45 rotates relative to the throttle body 42.
The throttle valve 44 moves in accordance with an amount of operation of the accelerator grip 8. The straddled vehicle 1 includes an accelerator operation transmitting device, not shown, for example. The accelerator operation transmitting device transmits the amount of operation of the accelerator grip 8 to the throttle valve 44.
The throttle device 41 may be classified as a mechanical throttle or an electronically controlled throttle. As for the mechanical throttle, the throttle valve 44 is mechanically coupled to the accelerator grip 8. If the throttle device 41 is classified as the mechanical throttle, the accelerator operation transmitting device includes a member (including at least any of a wire, cable, or link mechanism, for example) for mechanically coupling the accelerator grip 8 to the throttle valve 44. If the throttle device 41 is classified as the electronically controlled throttle, the accelerator operation transmitting device includes an accelerator sensor, an actuator, and a controller, which are each not shown. The accelerator sensor detects the amount of operation of the accelerator grip 8. The actuator actuates the throttle valve 44. The controller controls the actuator in accordance with detection results of the accelerator sensor.
Reference is made to Fig. 4. The throttle device 41 includes a magnetic sensor 46. Fig. 4 shows the magnetic sensor 46 with dotted lines. The magnetic sensor 46 is accommodated in the throttle body 42, for example.
The magnetic sensor 46 detects a position of the throttle valve 44. The magnetic sensor 46 detects a degree of opening of the throttle valve 44.
The magnetic sensor 46 senses a magnetic field. The magnetic sensor 46 senses a magnetic field, thereby detecting the position of the throttle valve 44. The magnetic sensor 46 detects the position of the throttle valve 44 without contacting the throttle valve 44.
The magnetic sensor 46 includes, for example, at least one of a Hall element, a Hall IC, and a magnetoresistive element.
The throttle device 41 includes a magnetic field forming device, not shown, for example. The magnetic field forming device is arranged in the vicinity of the magnetic sensor 46. The magnetic field forming device forms a magnetic field in the vicinity of the magnetic sensor 46. The magnetic sensor 46 senses the magnetic field formed by the magnetic field forming device. The magnetic field formed by the magnetic field forming device corresponds to the magnetic field sensed by the magnetic sensor 46. The magnetic field forming device is, for example, a magnet. The magnet is attached to either the throttle valve 44 or the valve shaft 45, for example. The magnet moves integrally with the throttle valve 44, for example. The magnet rotates integrally with the throttle valve 44, for example.
Part of the description about arrangement of the throttle device 41 described above is applied to arrangement of the magnetic sensor 46. The magnetic sensor 46 is located behind the cylinder head 26, for example. The magnetic sensor 46 is entirely located behind the cylinder head 26. The magnetic sensor 46 is located more rearward than the head cover 29. The magnetic sensor 46 is entirely located more rearward than the head cover 29. At least part of the magnetic sensor 46 is located lower than the upper end 29a of the head cover 29. The magnetic sensor 46 is entirely located behind the cylinder axis B in the side view of the vehicle. The magnetic sensor 46 is entirely located more rearward than the cylinder axis B in the side view of the vehicle. The magnetic sensor 46 is entirely located behind the extension E in the side view of the vehicle. The magnetic sensor 46 is entirely located more rearward than the extension E in the side view of the vehicle.
The straddled vehicle 1 further includes a fuel injector 51. The fuel injector 51 is attached to the throttle device 41, for example. The fuel injector 51 injects fuel to the intake passage 43, for example. The fuel injected from the fuel injector 51 is mixed with air flowing through the throttle device 41 to form a fuel-air mixture. The fuel-air mixture passes through the intake passage 27 of the cylinder head 26 into the combustion chamber 25. Here, instead of injecting fuel to the intake passage 43, the fuel injector 51 may inject fuel to the intake passage 27.
Reference is made to Figs. 2 to 5. The straddled vehicle 1 includes an ignition device 61. The ignition device 61 includes a spark plug 63, a plug cord 65, and an ignition coil 67. The spark plug 63 is shown in Fig. 5.
The plug cord 65 is connected to the spark plug 63. The ignition coil 67 is connected to the plug cord 65.
The ignition coil 67 is a high-voltage component. The ignition coil 67 generates a high voltage. The ignition coil 67 generates a high voltage current. The plug cord 65 transmits the high voltage current generated by the ignition coil 67. The plug cord 65 supplies the high voltage current to the spark plug 63. The spark plug 63 ignites the fuel-air mixture in the combustion chamber 25.
The number of spark plugs 63 of the ignition device 61 is one. The number of plug cords 65 of the ignition device 61 is one. The number of ignition coils 67 of the ignition device 61 is one.
Reference is made to Figs. 2 and 3. The plug cord 65 includes a first end 65a, and a second end 65b. The first end 65a is electrically connected to the ignition coil 67. The second end 65b is electrically connected to the spark plug 63. The second end 65b will hereinafter be called the "plug cap 65b". In Figs. 2 and 3, a position of the plug cap 65b substantially corresponds to a position of the spark plug 63.
Reference is made to Fig. 2. At least part of the ignition device 61 is located below the main frame 5 in the side view of the vehicle. In other words, at least part of the main frame 5 is located above the ignition device 61 in the side view of the vehicle. The ignition device 61 may or may not overlap the main frame 5 in the side view of the vehicle.
The main frame 5 extends from a position more forward than the ignition device 61 to a position more rearward than the ignition device 61 in the side view of the vehicle. More specifically, the main frame 5 passes above the ignition device 61, and extends from a position more forward than the ignition device 61 to a position more rearward than the ignition device 61 in the side view of the vehicle. The main frame 5 extends from a position more forward and higher than the ignition device 61 to a position more rearward and lower than the ignition device 61 in the side view of the vehicle. The engine fastening portion 13 is located more rearward and lower than the ignition device 61.
The ignition device 61 is located more forward than the throttle device 41. The ignition device 61 is entirely located more forward than the throttle device 41. The ignition device 61 is located more forward than the magnetic sensor 46. The ignition device 61 is entirely located more forward than the magnetic sensor 46.
Reference is made to Fig. 3. The main frame 5 extends from a position more forward than the ignition device 61 to a position more rearward than the ignition device 61 in the plan view of the vehicle.
At least part of the ignition device 61 overlaps the main frame 5 in the plan view of the vehicle.
Reference is made to Fig. 5. The ignition device 61 is entirely located in front of the extension E in the side view of the vehicle. The ignition device 61 is entirely located more forward than the extension E in the side view of the vehicle.
Reference is made to Fig. 2. The spark plug 63 is attached to the cylinder head 26. The spark plug 63 is supported by the cylinder head 26.
The spark plug 63 is attached to a right part of the cylinder head 26. Here, the right part of the cylinder head 26 is a region of the cylinder head 26 positioned rightward of the cylinder axis B. The right part of the cylinder head 26 is shown in Fig. 2.
Reference is made to Fig. 3. The spark plug 63 is entirely located rightward of the cylinder axis B in the plan view of the vehicle. The spark plug 63 is entirely located more rightward than the cylinder axis B in the plan view of the vehicle. The spark plug 63 does not cross the cylinder axis B in the plan view of the vehicle.
An area rightward of the cylinder axis B in the plan view of the vehicle is referred to as a "right area AR" as appropriate. The right area AR is located more rightward than the cylinder axis B. The spark plug 63 is entirely located in the right area AR in the plan view of the vehicle.
Reference is made to Fig. 5. The spark plug 63 passes through the right part of the cylinder head 26. The spark plug 63 is inserted into the cylinder head 26. The spark plug 63 reaches the combustion chamber 25.
The spark plug 63 contacts the cylinder head 26. The spark plug 63 is electrically connected to the cylinder head 26. The cylinder head 26 has conductivity. The cylinder head 26 is electrically connected to the head cover 29. The head cover 29 also has conductivity. Consequently, the spark plug 63 is electrically connected to the head cover 29.
The spark plug 63 overlaps the cylinder axis B in the side view of the vehicle.
The spark plug 63 is entirely located in front of the extension E in the side view of the vehicle. The spark plug 63 is entirely located more forward than the extension E in the side view of the vehicle.
The spark plug 63 is entirely located more forward than the throttle device 41. In other words, the throttle device 41 is entirely located more rearward than the spark plug 63. The spark plug 63 is entirely located more forward than the magnetic sensor 46. In other words, the magnetic sensor 46 is entirely located more rearward than the spark plug 63.
At least part of the spark plug 63 is located lower than the throttle device 41. In other words, at least part of the throttle device 41 is located higher than the spark plug 63.
Reference is made to Fig. 3. At least part of the ignition coil 67 overlaps the head cover 29 in the plan view of the vehicle. For example, the ignition coil 67 entirely overlaps the head cover 29 in the plan view of the vehicle.
The ignition coil 67 is entirely located leftward of the cylinder axis B in the plan view of the vehicle. The ignition coil 67 is entirely located more leftward than the cylinder axis B in the plan view of the vehicle. The ignition coil 67 does not cross the cylinder axis B in the plan view of the vehicle.
An area leftward of the cylinder axis B in the plan view of the vehicle is referred to as a "left area AL" as appropriate. The left area AL is located more leftward than the cylinder axis B. The ignition coil 67 is entirely located in the left area AL in the plan view of the vehicle.
Reference is made to Fig. 4. At least part of the ignition coil 67 is located in front of the cylinder axis B in the side view of the vehicle. At least part of the ignition coil 67 is located more forward than the cylinder axis B. For example, the ignition coil 67 is entirely located in front of the cylinder axis B in the side view of the vehicle. For example, the ignition coil 67 is entirely located more forward than the cylinder axis B in the side view of the vehicle.
The ignition coil 67 is entirely located more forward than the throttle device 41. The ignition coil 67 is entirely located more forward than the magnetic sensor 46.
The head cover 29 has a front end 29b. At least part of the ignition coil 67 is located more rearward than the front end 29b. For example, the ignition coil 67 is entirely located more rearward than the front end 29b.
Fig. 4 shows a first imaginary line F. The first imaginary line F passes the front end 29b and is parallel to the up-down direction Z in the side view of the vehicle. At least part of the ignition coil 67 is located behind the first imaginary line F in the side view of the vehicle. For example, the ignition coil 67 is entirely located behind the first imaginary line F in the side view of the vehicle. For example, the ignition coil 67 is entirely located more rearward than the first imaginary line F in the side view of the vehicle. For example, the ignition coil 67 does not overlap the first imaginary line F in the side view of the vehicle.
The ignition coil 67 is entirely located higher than the cylinder head 26.
At least part of the ignition coil 67 is located above the head cover 29. For example, the ignition coil 67 is entirely located above the head cover 29.
At least part of the ignition coil 67 is located higher than the upper end 29a of the head cover 29. For example, the ignition coil 67 is entirely located higher than the upper end 29a.
At least part of the ignition coil 67 is located higher than the throttle device 41. For example, the ignition coil 67 is entirely located higher than the throttle device 41. At least part of the ignition coil 67 is located higher than the magnetic sensor 46. For example, the ignition coil 67 is entirely located higher than the magnetic sensor 46.
Reference is made to Fig. 5. The ignition coil 67 is entirely located more forward than the spark plug 63.
The ignition coil 67 is entirely located higher than the spark plug 63.
The ignition coil 67 is entirely located in front of the extension E in the side view of the vehicle. The ignition coil 67 is entirely located more forward than the extension E in the side view of the vehicle.
Fig. 6 is a front view of the engine 11. At least part of the ignition coil 67 overlaps the head cover 29 in the front view of the vehicle.
Fig. 7 is a perspective view of the ignition coil 67. The ignition coil 67 includes a casing 71. The casing 71 has a substantially cylindrical shape. The casing 71 accommodates an iron core, a primary coil, and a secondary coil, which are each not shown. The primary coil and the secondary coil are wound around the iron core. The primary coil and the secondary coil are wound concentrically. For example, the primary coil is wound outward of iron core. For example, the secondary coil is wound outward of the primary coil. The iron core, the primary coil, and the secondary coil are electrically insulated from one another.
The ignition coil 67 includes a secondary terminal 72. The secondary terminal 72 is attached to the casing 71. The secondary terminal 72 is electrically connected to the secondary coil.
The secondary terminal 72 is connected to the plug cord 65. The secondary terminal 72 is electrically connected to the plug cord 65.
The secondary terminal 72 is electrically connected to the first end 65a of the plug cord 65.
The ignition coil 67 includes one or more (e.g., two) flanges 73. The flanges 73 are attached to the casing 71.
The flange 73 is of a plate shape, for example. The flange 73 is of a bar shape, for example.
One flange 73 extends rightward from the casing 71. The other flange 73 extends leftward from the casing 71.
The flanges 73 have conductivity, for example.
The flanges 73 are electrically connected to the iron core, for example. The flanges 73 are formed integrally with the iron core, for example.
Reference is made to Fig. 2. The plug cord 65 is located at a position equal to or lower than the ignition coil 67 in the up-down direction Z. The plug cord 65 has no portion located higher than the ignition coil 67.
The plug cord 65 is located at a position equal to or higher than the spark plug 63 in the up-down direction Z. The plug cord 65 has no portion located lower than the spark plug 63.
The plug cord 65 is located at a position equal to or more forward than the spark plug 63 in the longitudinal direction X. The plug cord 65 has no portion located more rearward than the spark plug 63. Accordingly, the plug cord 65 is entirely located in front of the extension E in the side view of the vehicle, which illustration is omitted. The plug cord 65 is entirely located more forward than the extension E in the side view of the vehicle. The position of the spark plug 63 corresponds to a rear end of the ignition device 61.
Reference is made to Fig. 3. At least part of the plug cord 65 overlaps the head cover 29. At least part of the plug cord 65 is located above the head cover 29.
The plug cord 65 is located in both the right area AR and the left area AL. The plug cord 65 extends from the right area AR to the left area AL.
The plug cord 65 is located at a position equal to or more rearward than the ignition coil 67 in the longitudinal direction X. The plug cord 65 has no portion located more forward than the ignition coil 67.
The position of the ignition coil 67 corresponds to a front end of the ignition device 61. Accordingly, the ignition device 61 is entirely located more rearward than the front end 29b of the head cover 29 in the side view of the vehicle, for example.
The plug cord 65 is located at a position equal to or more rightward than the ignition coil 67 in the transverse direction Y. The plug cord 65 has no portion located more leftward than the ignition coil 67.
The plug cord 65 is entirely located more forward than the throttle device 41. The plug cord 65 is entirely located more forward than the magnetic sensor 46.
Reference is made to Fig. 4. At least part of the plug cord 65 is located more rearward than the front end 29b of the head cover 29. For example, the plug cord 65 is entirely located more rearward than the front end 29b.
At least part of the plug cord 65 is located behind the first imaginary line F in the side view of the vehicle. For example, the plug cord 65 is entirely located behind the first imaginary line F in the side view of the vehicle.
Reference is made to Fig. 3. The first end 65a of the plug cord 65 extends rightward from the ignition coil 67.
Reference is made to Fig. 2. The plug cap 65b of the plug cord 65 extends upward from the spark plug 63. More specifically, the plug cap 65b extends upward and forward from the spark plug 63. Reference is made to Figs. 2 and 3. The plug cap 65b extends upward, forward, and rightward from the spark plug 63.
The plug cord 65 is curved. The plug cord 65 is curved with a relatively large radius of curvature.
Specifically, the plug cord 65 has a curved section 65c. The curved section 65c is positioned between the first end 65a and the plug cap 65b. The curved section 65c bends downward and rearward from the first end 65a in the side view of the vehicle. Then, the curved section 65c reaches the plug cap 65b.
Reference is made to Fig. 3. The curved section 65c is curved convexly rightward in the plan view of the vehicle.
The plug cord 65 is supported only by the spark plug 63 and ignition coil 67. That is, the plug cord 65 is not supported by any support members (e.g. clamp members) other than the spark plug 63 and ignition coil 67.
The plug cord 65 does not contact the body frame 3. The plug cord 65 does not contact the main frame 5. The plug cord 65 does not contact the engine 11.
Reference is made to Fig. 7. The straddled vehicle 1 includes a supporting portion 81. The supporting portion 81 supports the ignition coil 67. The supporting portion 81 supports the flange 73. The supporting portion 81 is connected to the flange 73.
The supporting portion 81 is supported by the head cover 29. The supporting portion 81 is connected to the head cover 29.
Reference is made to Fig. 3. At least part of the supporting portion 81 overlaps the head cover 29 in the plan view of the vehicle. For example, the supporting portion 81 entirely overlaps the head cover 29.
The supporting portion 81 is entirely located leftward of the cylinder axis B in the plan view of the vehicle. The supporting portion 81 is entirely located in the left area AL in the plan view of the vehicle.
Reference is made to Fig. 4. At least part of the supporting portion 81 is located in front of the cylinder axis B in the side view of the vehicle. At least part of the supporting portion 81 is located more forward than the cylinder axis B in the side view of the vehicle. For example, the supporting portion 81 is entirely located in front of the cylinder axis B in the side view of the vehicle. For example, the supporting portion 81 is entirely located more forward than the cylinder axis B in the side view of the vehicle.
The supporting portion 81 is entirely located more forward than the throttle device 41. The supporting portion 81 is entirely located more forward than the magnetic sensor 46.
At least part of the supporting portion 81 is located more rearward than the front end 29b. For example, the supporting portion 81 is entirely located more rearward than the front end 29b.
At least part of the supporting portion 81 is located behind the first imaginary line F in the side view of the vehicle. For example, the supporting portion 81 is entirely located behind the first imaginary line F in the side view of the vehicle.
The supporting portion 81 is entirely located higher than the cylinder head 26.
At least part of the supporting portion 81 is located above the head cover 29.
At least part of the supporting portion 81 is located higher than the upper end 29a of the head cover 29.
The supporting portion 81 extends upward and forward from the head cover 29.
The supporting portion 81 extends to a position higher than the upper end 29a of the head cover 29.
At least part of the supporting portion 81 is located higher than the throttle device 41. For example, the supporting portion 81 is entirely located higher than the throttle device 41.
Fig. 8 is a sectional view of the supporting portion 81. The supporting portion 81 contacts the head cover 29.
The supporting portion 81 contacts the flanges 73.
The supporting portion 81 electrically connects the head cover 29 to the flanges 73.
The supporting portion 81 has conductivity.
Reference is made to Figs. 7 and 8. The supporting portion 81 includes one or more (e.g., two) bosses 82. The bosses 82 are connected to the head cover 29.
The bosses 82 contact the head cover 29.
The bosses 82 are formed integrally with the head cover 29, for example. The bosses 82 are not separable from the head cover 29.
The bosses 82 extend upward and forward from the head cover 29.
The supporting portion 81 includes one or more (e.g., two) fastening portions 83. The fastening portions 83 fasten the flanges 73 to the bosses 82 individually.
Specifically, the fastening portion 83 is screwed into the boss 82. The fastening portion 83 and the boss 82 contact each other. The fastening portion 83 presses the flange 73 against the boss 82. The flange 73 and the boss 82 contact each other. The flange 73 and the fastening portion 83 contact each other. The fastening portion 83 is, for example, a bolt.
The bosses 82 electrically connect the head cover 29 to the flanges 73. The bosses 82 and the fastening portions 83 electrically connect the head cover 29 to the flanges 73.
The boss 82 has conductivity. The fastening portion 83 also has conductivity.
The straddled vehicle 1 has the body frame 3 and the engine 11. The engine 11 is fixed to the body frame 3. The engine 11 includes the cylinder member 23, the cylinder head 26, and the head cover 29. The cylinder member 23 has the cylinder bore 24. The cylinder bore 24 centers on the cylinder axis B. The cylinder head 26 is provided above the cylinder member 23. The head cover 29 is provided above the cylinder head 26.
The straddled vehicle 1 includes the throttle device 41. The throttle device 41 controls the intake air amount of the engine 11. The throttle device 41 is located behind the cylinder head 26. The throttle device 41 includes the throttle valve 44 and the magnetic sensor 46. The magnetic sensor 46 detects the position of the throttle valve 44.
The straddled vehicle 1 includes the ignition device 61. The ignition device 61 includes the spark plug 63, the plug cord 65, and the ignition coil 67. The spark plug 63 is attached to the cylinder head 26. The plug cord 65 is connected to the spark plug 63. The ignition coil 67 is connected to the plug cord 65.
The ignition coil 67 includes the casing 71, the secondary terminal 72, and the flanges 73. The secondary terminal 72 is attached to the casing 71. The secondary terminal 72 is connected to the plug cord 65. The flanges 73 are attached to the casing 71.
The straddled vehicle 1 includes the supporting portion 81. The supporting portion 81 supports the ignition coil 67. The supporting portion 81 is connected to the flange 73. The supporting portion 81 is supported by the head cover 29. Accordingly, the ignition coil 67 is supported by the head cover 29 via the supporting portion 81. As described above, the spark plug 63 is attached to the cylinder head 26. Accordingly, the ignition coil 67 and the spark plug 63 are both supported by the engine 11. The ignition coil 67 and the spark plug 63 both receive vibration of the engine 11. This can effectively suppress a difference in vibration between the ignition coil 67 and the spark plug 63. Accordingly, the ignition device 61 can be installed more appropriately.
The head cover 29 is lower in temperature than the cylinder member 23 and the cylinder head 26. Accordingly, the ignition coil 67 can be protected suitably from the heat of the engine 11. This can install the ignition device 61 more appropriately.
As described above, the throttle device 41 is located behind the cylinder head 26. At least part of the ignition coil 67 is located in front of the cylinder axis B in the side view of the vehicle. Accordingly, the magnetic sensor 46 can be sufficiently spaced apart from the ignition coil 67. In other words, a separation distance between the magnetic sensor 46 and the ignition coil 67 can be obtained appropriately. This can protect the magnetic sensor 46 from the ignition coil 67 suitably. That is, the magnetic field sensed by the magnetic sensor 46 can be protected from the ignition coil 67 suitably. Consequently, the magnetic sensor 46 can detect the position of the throttle valve 44 accurately.
The supporting portion 81 electrically connects the head cover 29 to the flanges 73. This effectively reduces radio noise emitted by the ignition device 61. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably. That is, the magnetic field sensed by the magnetic sensor 46 can be protected from the radio noise of the ignition device 61 suitably. Consequently, the magnetic sensor 46 can detect the position of the throttle valve 44 more accurately.
Here, it is presumed that the radio noise emitted from the ignition device 61 is reduced effectively because a current loop including the ignition device 61 becomes small effectively.
Fig. 9 schematically shows a current loop G1 in the straddled vehicle 1 according to the present embodiment. Fig. 9 shows the current loop G1 with dotted lines.
The current loop G1 is a path where current flows. Current flows from the ignition coil 67 through the plug cord 65 to the spark plug 63. The current flows from the spark plug 63 to the engine 11. Then, the current returns from the engine 11 through the supporting portion 81 to the ignition coil 67. In such a manner as above, the current loop G1 is a path of the current that flows in the ignition coil 67, the plug cord 65, the spark plug 63, the engine 11, the supporting portion 81, and the ignition coil 67 in this order. More specifically, the current loop G1 is a path of the current that flows in the ignition coil 67, the plug cord 65, the spark plug 63, the cylinder head 26, the head cover 29, the supporting portion 81, and the ignition coil 67 in this order. The current loop G1 is a closed path. A position of either the cylinder head 26 or the head cover 29 corresponds to a rear end of the current loop G1.
Here, the current loop G1 does not include the body frame 3. The current loop G1 does not include the main frame 5. That is because the supporting portion 81 electrically connects the head cover 29 to the flanges 73. In other words, that is because the supporting portion 81 electrically connects the engine 11 to the ignition coil 67.
Since the current loop G1 does not contain the body frame 3, the current loop G1 becomes small effectively. Specifically, an area surrounded by the current loop G1 becomes small effectively. Accordingly, the radio noise emitted from the ignition device 61 is reduced effectively.
Moreover, the throttle device 41 is located outward of the current loop G1 in the side view of the vehicle. That is, the throttle device 41 is not located inward of the current loop G1 in the side view of the vehicle. The throttle device 41 is located more rearward than the current loop G1 in the side view of the vehicle.
The magnetic sensor 46 is located outward of the current loop G1 in the side view of the vehicle. That is, the magnetic sensor 46 is not located inward of the current loop G1 in the side view of the vehicle. The magnetic sensor 46 is located more rearward than the current loop G1 in the side view of the vehicle.
The following exemplifies the configuration of a straddled vehicle and a current loop G2 in the straddled vehicle according to a comparative example for reference.
Fig. 10 schematically shows a current loop G2 in a straddled vehicle 101 according to a comparative example. Components identical to those of the embodiment are shown with the same signs, and will not particularly be described. In the straddled vehicle 101 according to the comparative example, the ignition coil 67 is supported by the body frame 3. In the straddled vehicle 101 according to the comparative example, the ignition coil 67 is not supported by the engine 11.
Specifically, the straddled vehicle 101 includes a supporting portion 103. The supporting portion 103 is supported by the body frame 3. Specifically, the supporting portion 103 is supported by the main frame 5. The supporting portion 103 supports the ignition coil 67. Accordingly, the ignition coil 67 is supported by the main frame 5 via the supporting portion 103. The supporting portion 103 is not supported by the engine 11. Accordingly, the ignition coil 67 is not supported by the engine 11.
In the straddled vehicle 101, current flows from the ignition coil 67 through the plug cord 65 to the spark plug 63. The current flows from the spark plug 63 to the engine 11. Then, the current flows from the engine 11 to the body frame 3 (specifically, main frame 5). Then, the current returns from the body frame 3 through the supporting portion 103 to the ignition coil 67. In such a manner as above, the current loop G2 is a path of the current that flows in the ignition coil 67, the plug cord 65, the spark plug 63, the engine 11, the body frame 3 (main frame 5), the supporting portion 103, and the ignition coil 67 in this order. For example, the current loop G2 is a path of the current that flows in the ignition coil 67, the plug cord 65, the spark plug 63, the cylinder head 26, the cylinder member 23, the crankcase 21, the engine fastening portion 13, the main frame 5, the supporting portion 103, and the ignition coil 67 in this order.
Here, the current loop G2 includes the body frame 3. The current loop G2 includes the main frame 5.
Since the current loop G2 contains the body frame 3, the current loop G2 is larger than the current loop G1. Since the current loop G2 contains the main frame 5, the current loop G2 is significantly larger than the current loop G1. Accordingly, the radio noise emitted from the ignition device 61 is relatively large in the straddled vehicle 101 according to the comparative example. This leads to difficulty in suppression of the radio noise emitted from the ignition device 61 in the straddled vehicle 101 according to the comparative example.
Moreover, the throttle device 41 is located inward of the current loop G2 in the side view of the vehicle. The current loop G2 extends from a position more forward than the throttle device 41 to a position more rearward than the throttle device 41 in the side view of the vehicle.
The magnetic sensor 46 is located inward of the current loop G2 in the side view of the vehicle. The current loop G2 extends from a position more forward than the magnetic sensor 46 to a position more rearward than the magnetic sensor 46 in the side view of the vehicle.
In summary, first of all, the engine 11 is fixed to the body frame 3, the ignition coil 67 is supported by the head cover 29 of the engine 11, and the spark plug 63 is attached to the cylinder head 26. Consequently, in the straddled vehicle 1 whose engine 11 is fixed to the body frame 3, the difference in vibration between the ignition coil 67 and the spark plug 63 can be suppressed suitably. Moreover, the ignition coil 67 can be protected suitably from the heat of the engine 11. This results in more suitable arrangement of the ignition device 61. Secondly, the throttle device 41 is located behind the cylinder head 26, and at least part of the ignition coil 67 is located in front of the cylinder axis B in the side view of the straddled vehicle. Accordingly, the magnetic sensor 46 can be sufficiently spaced apart from the ignition coil 67. This results in suitable protection of the magnetic sensor 46 from the ignition coil 67. Thirdly, the supporting portion 81 electrically connects the flanges 73 to the head cover 29. This effectively reduces the radio noise radiated by the ignition device 61. This results in suitable protection of the magnetic sensor 46 from the radio noise of the ignition device 61.
As described above, with the straddled vehicle 1, the ignition device 61 can be installed more appropriately. Specifically, with the straddled vehicle 1 according to the present invention, the difference in vibration between the ignition coil 67 and the spark plug 63 can be suppressed, and the magnetic sensor 46 can be protected from the ignition coil 67 as well as from the radio noise of the ignition device 61.
The ignition coil 67 is entirely located in front of the cylinder axis B in the side view of the vehicle. This can sufficiently obtain the separation distance between the ignition coil 67 and the magnetic sensor 46.
The throttle device 41 is entirely located behind the cylinder axis B in the side view of the vehicle. This can suitably obtain the separation distance between the ignition coil 67 and the magnetic sensor 46.
The magnetic sensor 46 is entirely located behind the cylinder axis B in the side view of the vehicle. This can suitably obtain the separation distance between the ignition coil 67 and the magnetic sensor 46.
The magnetic sensor 46 is located behind the cylinder head 26. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably.
The throttle device 41 is located more rearward than the head cover 29. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably.
The magnetic sensor 46 is located more rearward than the head cover 29. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably.
At least part of the ignition coil 67 is located more rearward than the front end 29b of the head cover 29. Accordingly, the ignition coil 67 is located near the head cover 29. Consequently, the head cover 29 can support the ignition coil 67 suitably.
Moreover, the throttle device 41 is located behind the cylinder head 26, at least part of the ignition coil 67 is located in front of the cylinder axis B in the side view of the vehicle, and at least part of the ignition coil 67 is located more rearward than the front end 29b of the head cover 29. Accordingly, the ignition coil 67 is not too close to the magnetic sensor 46 and not too far from the spark plug 63. In other words, the current loop G1 is made as small as possible while the separation distance between the ignition coil 67 and the magnetic sensor 46 is obtained sufficiently. This can protect the magnetic sensor 46 from the ignition coil 67 while protecting the magnetic sensor 46 from the radio noise of the ignition device 61. This results in achievement in a high level both the protection of the magnetic sensor 46 from the ignition coil 67 and the protection of the magnetic sensor 46 from the radio noise of the ignition device 61. In other words, the arrangement of the ignition coil 67 can be optimized.
The ignition coil 67 is entirely located more rearward than the front end 29b of the head cover 29. Accordingly, the head cover 29 can support the ignition coil 67 more suitably. Moreover, it is possible to achieve both the protection of the magnetic sensor 46 from the ignition coil 67 and the protection of the magnetic sensor 46 from the radio noise of the ignition device 61 in a much higher level.
At least part of the ignition coil 67 is located above the head cover 29. At least part of the ignition coil 67 overlaps the head cover 29 in the plan view of the vehicle. Accordingly, the head cover 29 can support the ignition coil 67 more suitably.
At least part of the ignition coil 67 is located higher than the throttle device 41. Accordingly, the magnetic sensor 46 can be easily spaced apart from the ignition coil 67.
At least part of the ignition coil 67 is located higher than the magnetic sensor 46. Accordingly, the magnetic sensor 46 can be easily spaced apart from the ignition coil 67.
At least part of the ignition coil 67 is located higher than the upper end 29a of the head cover 29. At least part of the throttle device 41 is located lower than the upper end 29a of the head cover 29. This can protect the ignition coil 67 from the heat of the engine 11 suitably. Moreover, this can easily obtain the separation distance between the ignition coil 67 and the magnetic sensor 46.
At least part of the ignition coil 67 is located higher than the upper end 29a of the head cover 29. At least part of the magnetic sensor 46 is located lower than the upper end 29a of the head cover 29. This can protect the ignition coil 67 from the heat of the engine 11 suitably. Moreover, this can easily obtain the separation distance between the ignition coil 67 and the magnetic sensor 46.
The ignition coil 67 is entirely located more forward than the spark plug 63. Accordingly, the current loop G1 is formed more forward than the spark plug 63. The current loop G1 extends forward from the spark plug 63. The throttle device 41 is entirely located more rearward than the spark plug 63. Accordingly, the throttle device 41 is located more rearward than the current loop G1. The throttle device 41 is entirely located more rearward than the current loop G1. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably.
The ignition coil 67 is entirely located more forward than the spark plug 63. The magnetic sensor 46 is entirely located more rearward than the spark plug 63. Accordingly, the magnetic sensor 46 is located more rearward than the current loop G1. The magnetic sensor 46 is entirely located more rearward than the current loop G1. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably.
The throttle device 41 is entirely located more rearward than the ignition device 61. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably.
The magnetic sensor 46 is entirely located more rearward than the ignition device 61. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably.
The ignition coil 67 is entirely located higher than the spark plug 63. At least part of the throttle device 41 is located higher than the spark plug 63. This can arrange the ignition coil 67, the spark plug 63, and the throttle device 41 at appropriate positions.
The spark plug 63 overlaps the cylinder axis B in the side view of the vehicle. Accordingly, the spark plug 63 can be positioned near the ignition coil 67. This further reduces the size of the current loop G1. Accordingly, the radio noise from the ignition device 61 is further reduced.
The spark plug 63 is entirely located in front of the extension E of the rear edge 24a of the cylinder bore 24 in the side view of the vehicle. This can easily reduce the size of the current loop G1. Accordingly, the radio noise of the ignition device 61 can be reduced suitably. This results in more suitable protection of the magnetic sensor 46 from the radio noise of the ignition device 61.
The ignition coil 67 is entirely located in front of the extension E in the side view of the vehicle. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 more suitably. The magnetic sensor 46 can be protected from the ignition coil 67 more suitably.
The throttle device 41 is entirely located behind the extension E in the side view of the vehicle. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 more suitably.
The magnetic sensor 46 is entirely located behind the extension E in the side view of the vehicle. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 more suitably.
The ignition coil 67 is entirely located in the left area AL in the plan view of the vehicle, and the spark plug 63 is entirely located in the right area AR in the plan view of the vehicle. This can bend the plug cord 65 relatively gently. For example, the plug cord 65 can be bent at a relatively low curvature. For example, the plug cord 65 can be bent at a relatively large radius of curvature. Accordingly, the plug cord 65 can be laid easily.
The supporting portion 81 extends upward and forward from the head cover 29. Consequently, the supporting portion 81 can support the ignition coil 67 suitably.
At least part of the supporting portion 81 overlaps the head cover 29 in the plan view of the vehicle. Thus, the head cover 29 can support the supporting portion 81 suitably. The supporting portion 81 can support the ignition coil 67 suitably.
The supporting portion 81 contacts the head cover 29. Thus, the supporting portion 81 can electrically connect the head cover 29 (engine 11) to the ignition coil 67 suitably.
The supporting portion 81 contacts the flanges 73. Thus, the supporting portion 81 can electrically connect the head cover 29 (engine 11) to the ignition coil 67 suitably.
The supporting portion 81 includes the bosses 82 and the fastening portions 83. The bosses 82 are connected to the head cover 29. The fastening portions 83 fasten the flanges 73 to the bosses 82 individually. The bosses 82 electrically connect the head cover 29 to the flanges 73. Thus, the supporting portion 81 can electrically connect the engine 11 to the ignition coil 67 suitably while supporting the ignition coil 67 suitably.
The cylinder axis B extends upward and forward at an angle of 45 degrees or more with respect to the horizontal line H in the side view of the vehicle. As described above, the cylinder axis B is closer to a vertical line than the horizontal line H. The vertical line is an imaginary line parallel to the up-down direction Z. Consequently, the present embodiment is suitably applicable to the engine 11 having the cylinder axis B that is closer to the vertical line than the horizontal line H.
The body frame 3 includes the main frame 5 connected to the engine 11. At least part of the main frame 5 is located above the engine 11 and the ignition device 61 in the side view of the vehicle. As described above, the current loop G1 does not contain the body frame 3. Accordingly, the current loop G1 can be reduced in size suitably even when at least part of the main frame 5 is located above the engine 11 and the ignition device 61 in the side view of the vehicle. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably.
The ignition coil 67 is entirely located more forward than the throttle device 41 in the side view of the vehicle. The throttle device 41 is entirely located behind the cylinder head 26. The main frame 5 extends from a position higher and more forward than the throttle device 41 to a position more rearward and lower than the throttle device 41 in the side view of the vehicle. The engine fastening portion 13 is located more rearward and lower than the throttle device 41 in the side view of the vehicle. In other words, at least one of the fastening points between the main frame 5 and the engine 11 is located more rearward and lower than the throttle device 41 in the side view of the vehicle. Accordingly, the current loop G1 can be reduced in size suitably even when the ignition coil 67, the engine 11, and the main frame 5 are arranged so as to surround the throttle device 41 in the side view of the vehicle. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably.
The main frame 5 includes the right main frame 5R and the left main frame 5L. The right main frame 5R passes a position rightward of the throttle device 41, and extends from a position more forward than the throttle device 41 to a position more rearward than the throttle device 41 in the plan view of the vehicle. The left main frame 5L passes a position leftward of the throttle device 41, and extends from a position more forward than the throttle device 41 to a position more rearward than the throttle device 41 in the plan view of the vehicle. Accordingly, the current loop G1 can be reduced in size suitably even when the right main frame 5R and the left main frame 5L are arranged so as to surround the throttle device 41 in the plan view of the vehicle. This can protect the magnetic sensor 46 from the radio noise of the ignition device 61 suitably.
The throttle device 41 includes the throttle body 42 configured to accommodate the throttle valve 44. The throttle body 42 contacts the cylinder head 26. Accordingly, the throttle body 42 is positioned near the cylinder head 26 (engine 11). This can enhance performance of the engine 11 suitably.
This invention is not limited to the foregoing embodiment, but may be modified as follows:

(1) In the present embodiment, the ignition coil 67 is entirely located behind the first imaginary line F in the side view of the vehicle. The ignition coil 67 does not overlap the first imaginary line F in the side view of the vehicle. However, the present invention is not limited to this. For example, at least part of the ignition coil 67 may be located in front of the first imaginary line F in the side view of the vehicle. For example, the ignition coil 67 may have a first portion positioned more forward than the first imaginary line F, and a second portion positioned more rearward than the first imaginary line F in the side view of the vehicle. For example, the ignition coil 67 may overlap the first imaginary line F in the side view of the vehicle. For example, the ignition coil 67 may cross the first imaginary line F in the side view of the vehicle. With such modifications as above, the head cover 29 can support the ignition coil 67 more suitably. Moreover, it is possible to achieve both the protection of the magnetic sensor 46 from the ignition coil 67 and the protection of the magnetic sensor 46 from the radio noise of the ignition device 61 in a much higher level.
(2) In the present embodiment described above, the supporting portion 81 is formed integrally with the head cover 29. The supporting portion 81 is not separable from the head cover 29. Specifically, the boss 82 is formed integrally with the head cover 29. The boss 82 is not separable from the head cover 29. However, the present invention is not limited to this. For example, the supporting portion 81 may be a member separable from the head cover 29. For example, the supporting portion 81 may be a member attachable to and detachable from the head cover 29. For example, the supporting portion 81 may be fastened to the head cover 29. Specifically, the boss 82 may be a member separable from the head cover 29, for example. The boss 82 may be a member attachable to and detachable from the head cover 29, for example. The boss 82 may be fastened to the head cover 29, for example.
(3) In the present embodiment described above, the number of flanges 73 of the ignition coil 67 is two. However, the present invention is not limited to this. For example, the number of flanges 73 may be one or may be more than two.
(4) In the present embodiment, the spark plug 63 is entirely located in the right area AR in the plan view of the vehicle, and the ignition coil 67 is entirely located in the left area AL in the plan view of the vehicle. However, the present invention is not limited to this. The spark plug 63 may entirely be located in the left area AL in the plan view of the vehicle, and the ignition coil 67 may entirely be located in the right area AR in the plan view of the vehicle. With such a modification, the plug cord 65 can be bent relatively gently. Accordingly, the plug cord 65 can be laid easily.
(5) In the present embodiment, the spark plug 63 is attached to the right part of the cylinder head 26. However, the present invention is not limited to this. For example, the spark plug 63 may be attached to a left part of the cylinder head 26. For example, the spark plug 63 may be attached to the front part of the cylinder head 26. With such a modification, the spark plug 63 can entirely be located in front of the extension E in the side view of the vehicle. Consequently, the throttle device 41 is entirely located more rearward than the spark plug 63. The magnetic sensor 46 is entirely located more rearward than the spark plug 63.
(6) In the present embodiment, the number of spark plugs 63 is one. However, the present invention is not limited to this. For example, the number of spark plugs 63 may be more than one.
(7) In the present embodiment, the number of plug cords 65 is one. However, the present invention is not limited to this. For example, the number of plug cords 65 may be more than one.
(8) In the present embodiment, the main frame 5 extends to a position more rearward than the engine 11. However, the present invention is not limited to this. For example, the main frame 5 may not extend to a position more rearward than the engine 11.
(9) In the present embodiment, the number of front wheels 9 is one. However, the present invention is not limited to this. The number of front wheels 9 may be two. In the embodiment described above, the number of rear wheels 19 is one. The present invention is not limited to this. The number of rear wheels 19 may be two.
(10) In the present embodiment described above, the straddled vehicle 1 has been illustrated as an example of dual purpose vehicles. The present invention is not limited to this. For example, the straddled vehicle 1 may be changed to vehicles of other types, such as the off-road type, street type, sport type or a vehicle for irregular grounds (ALL-TERRAIN VEHICLE). For example, the straddled vehicle 1 may be changed to a vehicle other than a scooter type.
(11) The foregoing embodiment and each of the modified embodiments described in paragraphs (1) to (10) above may be further varied as appropriate by replacing or combining their constructions with the constructions of the other modified embodiments.

Claims

A straddled vehicle (1), comprising:
a body frame (3);

an engine (11) fixed to the body frame (3);

a throttle device (41) configured to control an intake air amount of the engine (11);

an ignition device (61) including a spark plug (63), a plug cord (65) connected to the spark plug (63), and an ignition coil (67) connected to the plug cord (65); and

a supporting portion (81) configured to support the ignition coil (67),

the engine (11) including:
a cylinder member (23) having a cylinder bore (24) centering on a cylinder axis (B);

a cylinder head (26) provided above the cylinder member (23); and

a head cover (29) provided above the cylinder head (26),

the throttle device (41) being located behind the cylinder head (26),

the throttle device (41) including:
a throttle valve (44); and

a magnetic sensor (46) configured to detect a position of the throttle valve (44);

the spark plug (63) being attached to the cylinder head (26),

the ignition coil (67) including:
a casing (71);

a secondary terminal (72) attached to the casing (71) and connected to the plug cord (65); and

a flange (73) attached to the casing (71) and connected to the supporting portion (81);

the supporting portion (81) being supported by the head cover (29),

at least part of the ignition coil (67) being located in front of the cylinder axis (B) in side view of the straddled vehicle (1), and

the supporting portion (81) electrically connecting the head cover (29) to the flange (73).
The straddled vehicle (1) according to claim 1, wherein
at least part of the ignition coil (67) is located more rearward than a front end (29b) of the head cover (29).
The straddled vehicle (1) according to claim 1 or 2, wherein
the ignition coil (67) is entirely located more rearward than a front end (29b) of the head cover (29).
The straddled vehicle (1) according to claim 1 or 2, wherein
in the side view of the straddled vehicle (1), the ignition coil (67) overlaps a first imaginary line (F) that passes a front end (29b) of the head cover (29) and is parallel to an up-down direction (Z) of the straddled vehicle (1).
The straddled vehicle (1) according to any of claims 1 to 4, wherein
at least part of the ignition coil (67) is located above the head cover (29), and

at least part of the ignition coil (67) overlaps the head cover (29) in the plan view of the straddled vehicle (1).
The straddled vehicle (1) according to any of claims 1 to 5, wherein
at least part of the ignition coil (67) is located higher than the throttle device (41).
The straddled vehicle (1) according to any of claims 1 to 6, wherein
at least part of the ignition coil (67) is located higher than an upper end (29a) of the head cover (29), and

at least part of the throttle device (41) is located lower than the upper end (29a) of the head cover (29).
The straddled vehicle (1) according to any of claims 1 to 7, wherein
the ignition coil (67) is entirely located more forward than the spark plug (63), and

the throttle device (41) is entirely located more rearward than the spark plug (63).
The straddled vehicle (1) according to any of claims 1 to 8, wherein
the spark plug (63) is entirely located in front of an extension (E) of a rear edge (24a) of the cylinder bore (24) in the side view of the straddled vehicle (1).
The straddled vehicle (1) according to any of claims 1 to 9, wherein
the supporting portion (81) extends upward and forward from the head cover (29).
The straddled vehicle (1) according to any of claims 1 to 10, wherein
at least part of the supporting portion (81) overlaps the head cover (29) in the plan view of the straddled vehicle (1).
The straddled vehicle (1) according to any of claims 1 to 11, wherein
the supporting portion (81) includes:
a boss (82) connected to the head cover (29); and

a fastening portion (83) fastening the flange (73) to the boss (82), and the boss (82) electrically connects the head cover (29) to the flange (73).
The straddled vehicle (1) according to any of claims 1 to 12, wherein
the cylinder axis (B) extends upward and forward at an angle of 45 degrees or more with respect to a horizontal line (H) in the side view of the straddled vehicle (1).
The straddled vehicle (1) according to any of claims 1 to 13, wherein
the body frame (3) includes a main frame (5) configured to be connected to the engine (11), and

at least part of the main frame (5) is located above the engine (11) and the ignition device (61) in the side view of the straddled vehicle (1).
The straddled vehicle (1) according to any of claims 1 to 14, wherein
the throttle device (41) includes a throttle body (42) configured to accommodate the throttle valve (44), and

the throttle body (42) contacts the cylinder head (26).