JP2021008172A - Saddle-riding type vehicle - Google Patents

Abstract

To provide a saddle-riding type vehicle having an internal combustion engine with a motor for driving a throttle valve and a fuel injection valve.SOLUTION: An internal combustion engine 15 includes: a cylinder body 3 extending forward and upward from a crank case 2; an intake pipe 10 extending upward from a cylinder head 5; and a motor 13 for driving a throttle valve 11. At least a part of the fuel injection valve 12 is disposed forward of the intake pipe 10. At least a part of the motor 13 is disposed backward of the intake pipe 10. At least the part of the fuel injection valve 12 and at least a part of the throttle valve 11 are disposed downward of an upper end 13a of the motor 13 and upward of a lower end 13b.SELECTED DRAWING: Figure 3

Description

The present invention relates to a saddle-mounted vehicle including an internal combustion engine having a motor for driving a throttle valve and a fuel injection valve.

Conventionally, a saddle-type vehicle having an internal combustion engine in which a cylinder axis extends forward and upward from a crankcase has been known. Further, such an internal combustion engine is known to include a motor for driving a throttle valve arranged in an intake passage and a fuel injection valve for injecting fuel into the intake passage. For example, FIG. 8 of Patent Document 1 describes such an internal combustion engine. According to the internal combustion engine described in Patent Document 1, the intake passage extends upward from the cylinder head. The motor is located in front of the intake passage and the fuel injection valve is located behind the intake passage.

Japanese Patent No. 4916563

In the internal combustion engine, the cylinder axis extends forward and upward, and the intake passage extends upward from the cylinder head. The upstream end of the intake passage is connected to the air cleaner and the downstream end of the intake passage is connected to the cylinder head. A part of the cylinder head and a part of the cylinder head cover are arranged in front of the intake passage. Therefore, there is no room in front of the downstream end of the intake passage (that is, the connection portion with the cylinder head).

In order to drive the throttle valve accurately and enhance the responsiveness of the throttle valve, it is preferable to arrange the motor in the vicinity of the throttle valve. However, the motor that drives the throttle valve is a relatively large device. In a conventional internal combustion engine, since there is no space in front of the downstream end of the intake passage, the motor is arranged closer to the upstream end. As a result, the distance between the throttle valve and the combustion chamber was long. This has been a factor limiting the miniaturization of the internal combustion engine.

The present invention has been made in view of this point, and an object of the present invention is to miniaturize a saddle-type vehicle equipped with an internal combustion engine having a motor for driving a throttle valve and a fuel injection valve.

The saddle-mounted vehicle disclosed herein is equipped with an internal combustion engine. The internal combustion engine includes a crankcase that rotatably supports a crank shaft extending in the vehicle width direction, a cylinder body extending forward and upward from the crankcase, a cylinder formed inside the cylinder body, and the cylinder body. A cylinder head connected to the cylinder head, an intake port formed inside the cylinder head and opening toward the inside of the cylinder, an intake valve supported by the cylinder head to open and close the intake port, and the cylinder head. An intake cam that is rotatably supported and drives the intake valve, an intake port that is formed inside the cylinder head and is connected to the intake port, and an intake port that is connected to the cylinder head and extends upward from the cylinder head. An intake pipe connected to the intake port, a throttle valve arranged inside the intake pipe, a fuel injection valve having an injection hole arranged between the throttle valve and the intake port, and a fuel injection valve connected to the throttle valve. It has a motor for driving the throttle valve. At least a part of the fuel injection valve is arranged in front of the intake pipe. At least a part of the motor is arranged behind the intake pipe. At least a part of the fuel injection valve and at least a part of the throttle valve are arranged below the upper end and above the lower end of the motor.

According to the saddle-mounted vehicle, the cylinder body and the cylinder head extend forward and upward from the crankcase, and the intake pipe extends upward from the cylinder head. Therefore, in front of the portion of the intake pipe near the cylinder head. , There is no room for space. However, it was decided to place at least a part of the motor behind the intake pipe. Therefore, the motor could be arranged in the intake pipe near the cylinder head. Further, according to the saddle-mounted vehicle, at least a part of the fuel injection valve is arranged in front of the intake pipe. As a result, there was no interference between the fuel injection valve and the motor, and the fuel injection valve could be arranged compactly. Further, according to the saddle-mounted vehicle, at least a part of the fuel injection valve and at least a part of the throttle valve are arranged below the upper end of the motor and above the lower end, so that the motor and the fuel injection valve are arranged. , And the overall vertical dimension of the throttle valve can be suppressed. Therefore, the internal combustion engine can be miniaturized, and the saddle-mounted vehicle can be miniaturized.

According to a preferred embodiment, at least a portion of the intake cam is located below the top and above the bottom of the motor.

According to the above aspect, the entire vertical dimension of the motor, the fuel injection valve, the throttle valve, and the cylinder head (specifically, the portion of the cylinder head provided with the intake cam) can be suppressed, so that the internal combustion engine can be operated. It can be further miniaturized.

According to a preferred embodiment, the rotation center of the intake cam, the injection hole of the fuel injection valve, and the rotation center of the throttle valve are arranged below the upper end of the motor and above the lower end. There is.

According to the above aspect, the vertical dimensions of the entire motor, fuel injection valve, throttle valve, and cylinder head can be further suppressed, so that the internal combustion engine can be further miniaturized.

According to a preferred embodiment, the fuel injection valve and the throttle valve are arranged behind the front end of the rotation locus of the intake cam and in front of the rear end of the motor.

According to the above aspect, the overall front-rear dimension of the motor, the throttle valve, the fuel injection valve, and the intake cam can be suppressed, so that the internal combustion engine can be further miniaturized.

According to a preferred embodiment, the fuel injection valve and the throttle valve are arranged behind the rotation center of the intake cam and in front of the center of the motor.

According to the above aspect, the overall front-rear dimension of the motor, the throttle valve, the fuel injection valve, and the intake cam can be further suppressed, so that the internal combustion engine can be further miniaturized.

According to a preferred embodiment, the fuel injection valve and the throttle valve are arranged behind the rotation center of the intake cam and in front of the rotation center of the crankshaft.

According to the above aspect, the overall front-rear dimension of the motor, the throttle valve, the fuel injection valve, and the intake cam can be suppressed, so that the internal combustion engine can be further miniaturized.

According to a preferred aspect, in a vehicle side view, a straight line passing through the center of rotation of the intake cam and perpendicular to the axis of the cylinder is the first line, passing through the center of the intake port and perpendicular to the axis of the cylinder. When the straight line is the second line, the injection hole of the fuel injection valve, the center of the throttle valve, and the center of the motor are arranged between the first line and the second line. ing.

According to the above aspect, the overall dimensions of the motor, throttle valve, fuel injection valve, and intake cam can be suppressed with respect to the direction along the cylinder axis. The internal combustion engine can be further miniaturized.

According to a preferred embodiment, in a vehicle side view, the injection hole of the fuel injection valve, the entire throttle valve, and the entire motor are arranged between the first line and the second line. Has been done.

According to the above aspect, the overall dimensions of the motor, throttle valve, fuel injection valve, and intake cam can be further suppressed with respect to the direction along the cylinder axis. The internal combustion engine can be further miniaturized.

According to a preferred embodiment, the center line of the intake pipe is located behind the center of rotation of the intake cam and in front of the rear end of the motor.

According to the above aspect, the dimension of the intake pipe in the front-rear direction is small. The internal combustion engine can be further miniaturized.

According to a preferred embodiment, the angle between the axis of the cylinder and the horizontal line is 45 degrees or more in the side view of the vehicle.

According to the above aspect, since the cylinder has a large inclination, the space between the cylinder body and the cylinder head and the intake pipe is small. Therefore, the above-mentioned effect such that the motor can be arranged in the portion of the intake pipe close to the cylinder head becomes particularly remarkable.

According to a preferred aspect, the angle of the angle formed by the axis of the fuel injection valve with the horizontal line is larger than the angle of the angle formed by the axis of the cylinder with the horizontal line in the side view of the vehicle.

According to the above aspect, the fuel injection valve is arranged in a posture along the more vertical direction. The dimensions of the fuel injection valve in the front-rear direction can be suppressed. Therefore, the fuel injection valve can be compactly arranged in a small space between the cylinder head and the intake pipe.

According to a preferred embodiment, the saddle-mounted vehicle includes a body frame that supports the internal combustion engine. The vehicle body frame has a side frame that overlaps at least a part of the throttle valve, at least a part of the fuel injection valve, and at least a part of the motor when viewed from the side of the vehicle.

According to the saddle-mounted vehicle, at least a part of the fuel injection valve is arranged in front of the intake pipe, and at least a part of the motor is arranged behind the intake pipe. The side frame can be placed on the side of the intake pipe without being disturbed by the fuel injection valve and the motor. According to the above aspect, at least a part of the throttle valve, at least a part of the fuel injection valve, and at least a part of the motor can be compactly arranged on the side of the side frame. In addition, the overall vertical dimensions of the throttle valve, fuel injection valve, motor, and side frame can be suppressed. As a result, the saddle-mounted vehicle can be miniaturized.

According to a preferred embodiment, the saddle-mounted vehicle includes a fuel tank arranged behind the intake pipe and a fuel hose connected to the fuel tank and the fuel injection valve. A part of the fuel hose is arranged on the side of the intake pipe.

According to the above aspect, the fuel hose extends from the fuel tank toward the fuel injection valve through the side of the intake pipe. Since the motor is located behind the intake pipe, interference between the fuel hose and the motor can be avoided.

The saddle-mounted vehicle may include an air cleaner case having a connection port to which the intake pipe is connected.

According to a preferred embodiment, the internal combustion engine includes a piston arranged in the cylinder, a crankpin provided on the crankshaft, and a connecting rod connected to the piston and the crankpin. At least a part of the connection port of the air cleaner case, at least a part of the throttle valve, and at least a part of the motor are rearward of the front end and front of the rear end of the rotation locus of the crankpin. Is located in.

According to the above aspect, since the connection port of the air cleaner case, the throttle valve, and the entire front-rear dimension of the motor can be suppressed, the saddle-type vehicle can be miniaturized.

According to a preferred embodiment, at least a part of the fuel injection valve is located below the upper end of the connection port of the air cleaner case and above the lower end.

According to the above aspect, the vertical distance between the connection port of the air cleaner case and the fuel injection valve is short. The saddle-mounted vehicle can be miniaturized.

According to a preferred embodiment, in a vehicle side view, a straight line passing through the center of the motor and parallel to the axis of the cylinder overlaps the air cleaner case.

According to the above aspect, the motor is located near the air cleaner case. The motor and air cleaner case can be arranged compactly.

According to a preferred embodiment, the fuel injection valve is a mixed flow injector whose injection direction is inclined from the axis of the fuel injection valve toward the intake port.

According to the above aspect, the fuel can be effectively injected toward the intake port.

According to a preferred embodiment, the intake valve comprises a poppet valve including an umbrella portion that closes the intake port and a rod-shaped stem extending from the umbrella portion. The fuel injection valve is arranged so that a straight line extending from the injection hole in the injection direction intersects the umbrella portion.

According to the above aspect, the fuel can be effectively injected toward the intake port.

According to the present invention, a saddle-type vehicle equipped with an internal combustion engine having a motor for driving a throttle valve and a fuel injection valve can be miniaturized.

It is a left side view of the motorcycle which concerns on embodiment. It is a right side view of a part of a body frame, an internal combustion engine, an air cleaner, and a fuel tank. It is sectional drawing of an internal combustion engine and an air cleaner. It is an enlarged sectional view of a part of an internal combustion engine and an air cleaner. It is the figure corresponding to FIG. 3 which described the auxiliary line. It is a figure corresponding to FIG. 4 which described the auxiliary line.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a left side view of the motorcycle 50 according to the present embodiment.

Unless otherwise specified in the following description, the front, rear, left, right, top, and bottom are stationary motorcycles 50 with no occupants and no fuel or luggage loaded upright on a horizontal surface. In this case, it means front, rear, left, right, top, and bottom as seen from a virtual occupant sitting on the seat 21. The symbols F, Re, L, R, U, and D in the figure represent front, back, left, right, top, and bottom, respectively. Unless otherwise specified, the term "forward" includes not only a direction extending forward along the vehicle center line but also a direction inclined at an angle of 45 degrees to the left or right from the direction in the vehicle plan view. Similarly, the term "rear" includes not only a direction extending backward along the vehicle center line in a vehicle plan view, but also a direction tilted to the left or right within 45 degrees from the direction. The term "left" includes not only a direction extending to the left perpendicular to the center line of the vehicle in a vehicle plan view, but also a direction tilted at an angle within 45 degrees in the front-rear direction from the direction. The right side includes not only the direction extending to the right perpendicularly to the vehicle center line in the vehicle plan view, but also the direction inclined at an angle within 45 degrees in the front-rear direction from the direction. The term "upward" includes not only the direction vertically upward in the side view of the vehicle, but also the direction tilted at an angle within 45 degrees in the front-rear direction from the direction. The term "downward" includes not only the direction vertically downward in the side view of the vehicle, but also the direction in which the vehicle is tilted forward and backward within 45 degrees from the direction.

As shown in FIG. 1, the motorcycle 50 includes an air cleaner 35 covered with a body frame 22, front wheels 23, rear wheels 24, an internal combustion engine (hereinafter referred to as an engine) 15, and an exterior cover 35A (see FIG. 2). ), A fuel tank 14, and a seat 21. The seat 21 is arranged behind the fuel tank 14.

The vehicle body frame 22 includes a head pipe 26, left and right side frames 27 extending rearward from the head pipe 26 and outward in the vehicle width direction, and left and right down frames 28 extending downward from the rear ends of the left and right side frames 27. Includes. A steering shaft (not shown) to which the steering wheel 29 is fixed is rotatably supported on the head pipe 26. The steering shaft is fixed to the front fork 30.

The front wheel 23 is supported by the front fork 30. The rear wheel 24 is supported by the rear end portion of the rear arm 31. The front end portion of the rear arm 31 is supported by the pivot shaft 32 so as to be swingable up and down by the down frame 28. The front wheel 23 is a driven wheel. The rear wheels 24 are drive wheels driven by the engine 15. The engine 15 and the rear wheel 24 are connected by a chain 33. The chain 33 is an example of a power transmission member. However, the power transmission member that transmits the power of the engine 15 to the rear wheels 24 is not limited to the chain 33, and may be a transmission belt, a drive shaft, or the like.

FIG. 2 is a right side view of a part of the vehicle body frame 22, the engine 15, the air cleaner 35, and the fuel tank 14. FIG. 3 is a cross-sectional view of the engine 15 and the air cleaner 35. FIG. 4 is an enlarged cross-sectional view of a part of the engine 15 and the air cleaner 35. Note that FIGS. 3 and 4 are cross-sectional views orthogonal to the vehicle width direction.

As shown in FIG. 2, the engine 15 is supported by the vehicle body frame 22. As shown in FIG. 3, the engine 15 includes a crankshaft 1, a crankcase 2, a cylinder body 3, a cylinder head 5, and a cylinder head cover 36. Further, the engine 15 includes an intake valve 7, an exhaust valve 37, an intake cam 8, an exhaust cam 38, an intake pipe 10, an exhaust pipe 40 (see FIG. 1), a fuel injection valve 12, and a fuel injection valve. It includes a 12B, a throttle valve 11, and a motor 13 that drives the throttle valve 11.

The crankshaft 1 extends in the vehicle width direction. The crankshaft 1 is arranged inside the crankcase 2. The crankcase 2 rotatably supports the crankshaft 1. The cylinder body 3 extends forward and upward from the crankcase 2. A cylinder 4 is formed inside the cylinder body 3. A piston 18 is arranged inside the cylinder 4. A crankpin 19 is provided on the crankshaft 1. A connecting rod 20 is connected to the piston 18 and the crank pin 19. The piston 18 is connected to the crankshaft 1 via a connecting rod 20 and a crank pin 19. Reference numeral 67 indicates a balancer gear, and reference numeral 68 indicates a clutch.

The engine 15 of the present embodiment is an engine in which the cylinder 4 is relatively raised. As shown in FIG. 5, the angle θ1 of the angle formed by the cylinder axis 4c with the horizontal line PL is 45 degrees or more. However, the value of the angle θ1 is not particularly limited. θ1 may be less than 45 degrees.

As shown in FIG. 4, the cylinder head 5 is connected to the cylinder body 3. The cylinder head 5 extends forward and upward from the cylinder body 3. The cylinder head cover 36 is connected to the cylinder head 5. The cylinder head cover 36 extends forward and upward from the cylinder head 5. Inside the cylinder head 5, an intake port 6 and an exhaust port 39 that open toward the inside of the cylinder 4 are formed. Further, inside the cylinder head 5, an intake port 9 connected to the intake port 6 and an exhaust port 41 connected to the exhaust port 39 are formed. The intake valve 7 is composed of a poppet valve having an umbrella portion 42 that closes the intake port 6 and a shaft-shaped stem 43 extending from the umbrella portion 42. The exhaust valve 37 is also composed of a poppet valve. The intake valve 7 and the exhaust valve 37 are supported by the cylinder head 5 so as to be movable in the axial direction of the stem 43. The intake valve 7 closes the intake port 6 so that it can be opened and closed, and the exhaust valve 37 closes the exhaust port 39 so that it can be opened and closed.

The intake cam 8 and the exhaust cam 38 are rotatably supported by the cylinder head 5. The intake cam 8 drives the intake valve 7 by rotating. The exhaust cam 38 drives the exhaust valve 37 by rotating. The rotation center 8c of the intake cam 8 is located behind and above the rotation center 38c of the exhaust cam 38.

The intake pipe 10 is connected to the cylinder head 5 and is connected to the intake port 9. The intake pipe 10 is configured to guide air to the intake port 9. As shown in FIG. 3, the intake pipe 10 extends upward from the cylinder head 5. Specifically, the intake pipe 10 extends upward and rearward from the cylinder head 5. The size of the intake pipe 10 in the front-rear direction is relatively small. Here, the center line 10c of the intake pipe 10 is located behind the rotation center 8c of the intake cam 8 and in front of the rear end 13r of the motor 13.

The intake pipe 10 includes a first intake pipe 10A and a second intake pipe 10B. The first intake pipe 10A is arranged above the second intake pipe 10B. The first intake pipe 10A is arranged on the upstream side of the second intake pipe 10B. The first intake pipe 10A is removable from the second intake pipe 10B. The motorcycle 50 includes an actuator 10K that drives the first intake pipe 10A.

When the actuator 10K moves the first intake pipe 10A downward, the first intake pipe 10A is connected to the second intake pipe 10B. In this case, the air is sucked from the inlet 10Ai of the first intake pipe 10A, passes through the first intake pipe 10A and the second intake pipe 10B, and then flows into the intake port 9. When the actuator 10K moves the first intake pipe 10A upward, the first intake pipe 10A is separated from the second intake pipe 10B. In this case, the air is sucked from the inlet 10Bi of the second intake pipe 10B, passes through the second intake pipe 10B, and then is sucked into the intake port 9.

When the first intake pipe 10A is connected to the second intake pipe 10B, the length of the intake pipe 10 is the sum of the length of the first intake pipe 10A and the length of the second intake pipe 10B. When the first intake pipe 10A is separated from the second intake pipe 10B, the length of the intake pipe 10 becomes equal to the length of the second intake pipe 10B. As described above, the length of the intake pipe 10 is variable by attaching and detaching the first intake pipe 10A to and from the second intake pipe 10B. However, the length of the intake pipe 10 does not necessarily have to be variable. The first intake pipe 10A and the second intake pipe 10B may be always connected. The first intake pipe 10A and the second intake pipe 10B may be integrated. Further, the first intake pipe 10A may be omitted.

The throttle valve 11 is arranged inside the intake pipe 10 (specifically, the second intake pipe 10B). The throttle valve 11 is driven by the motor 13. The motor 13 is connected to the throttle valve 11 so as to be able to transmit power. At least a part of the motor 13 is arranged behind the intake pipe 10. Here, the entire motor 13 is arranged behind the center line 10c of the intake pipe 10. The entire motor 13 is arranged behind the intake pipe 10.

As shown in FIG. 4, the fuel injection valve 12 is attached to the intake pipe 10 (specifically, the second intake pipe 10B). The fuel injection valve 12 is attached so as to extend upward from the intake pipe 10. The fuel injection valve 12 may be attached so as to extend vertically upward, but here, as shown in FIG. 6, the axis line 12c of the fuel injection valve 12 is inclined from the horizontal line PL and the vertical line VL. The angle θ2 formed by the axis 12c of the fuel injection valve 12 with the horizontal line PL is larger than the angle θ1 (see FIG. 5) formed by the cylinder axis 4c with the horizontal line PL. θ2> θ1.

As shown in FIG. 4, a part of the fuel injection valve 12 is arranged outside the intake pipe 10, and the other part of the fuel injection valve 12 is arranged inside the intake pipe 10. At least a part of the fuel injection valve 12 is arranged in front of the intake pipe 10. The entire fuel injection valve 12 is arranged in front of the center line 10c of the intake pipe 10 (see FIG. 3). The injection hole 12a of the fuel injection valve 12 is arranged between the throttle valve 11 and the intake port 6. The injection hole 12a is arranged on the downstream side in the air flow direction with respect to the throttle valve 11.

In the present embodiment, as shown in FIG. 6, the fuel injection valve 12 is a diagonal flow injector in which the fuel injection direction 12s is inclined from the axis 12c of the fuel injection valve 12. Here, the injection direction 12s of the fuel injection valve 12 is inclined from the axis 12c of the fuel injection valve 12 toward the intake port 6. Strictly speaking, the injected fuel becomes a jet and disperses, so the injection direction is not one direction. The injection direction of the fuel injection valve 12 referred to here is the direction of the center line of the jet flow. In the present embodiment, the injection hole 12a of the fuel injection valve 12 is opened in a direction inclined from the axis 12c of the fuel injection valve 12 toward the intake port 6. A straight line extending from the injection hole 12a in the injection direction 12s intersects the umbrella portion 42 of the intake valve 7.

The timing at which the fuel injection valve 12 injects fuel is not particularly limited. The fuel injection valve 12 may inject fuel when the intake valve 7 is open, or may inject fuel when the intake valve 7 is closed. In the present embodiment, the fuel injection valve 12 injects fuel when the intake valve 7 is closed, and does not inject fuel when the intake valve 7 is open. A part of the fuel injected from the fuel injection valve 12 adheres to the umbrella portion 42 of the intake valve 7, then evaporates and mixes with the air.

As shown by a virtual line in FIG. 5, the fuel injection valve 12 and the fuel tank 14 are connected by a fuel hose 16. In the present embodiment, the fuel tank 14 is arranged behind the intake pipe 10, and the root portion of the fuel injection valve 12 is arranged in front of the intake pipe 10. Therefore, the fuel hose 16 is arranged from the rear of the intake pipe 10. You need to extend it forward. The fuel hose 16 extends forward through the side of the intake pipe 10. Specifically, the fuel hose 16 extends forward through the right side of the intake pipe 10. A part of the fuel hose 16 is arranged on the side of the intake pipe 10.

The straight line 13aL in FIG. 6 is a horizontal line passing through the upper end 13a of the motor 13. The straight line 13bL is a horizontal line passing through the lower end 13b of the motor 13. At least a part of the fuel injection valve 12 and at least a part of the throttle valve 11 are arranged below the upper end 13a of the motor 13 and above the lower end 13b. Unless otherwise specified in the present specification, the position of the throttle valve 11 means the position when the throttle valve 11 is in the fully closed state (see FIGS. 3 to 6). In the present embodiment, the fuel injection valve 12, the throttle valve 11, and the motor 13 are arranged at positions close to each other in the vertical direction. The overall vertical dimensions of the fuel injection valve 12, the throttle valve 11, and the motor 13 are reduced. The fuel injection valve 12, the throttle valve 11, and the motor 13 are arranged below the upper end 36u of the cylinder head cover 36.

At least a part of the intake cam 8 is arranged below the upper end 13a of the motor 13 and above the lower end 13b. In the present embodiment, the intake cam 8 is also arranged at positions close to the fuel injection valve 12, the throttle valve 11, and the motor 13 with respect to the vertical position. The overall vertical dimensions of the fuel injection valve 12, the throttle valve 11, the motor 13, and the intake cam 8 are reduced. The rotation center 8c of the intake cam 8, the injection hole 12a of the fuel injection valve 12, and the rotation center 11c of the throttle valve 11 are arranged below the upper end 13a of the motor 13 and above the lower end 13b.

In FIG. 6, the virtual line represented by the reference numeral 8d represents the rotation locus of the intake cam 8. Reference numeral 8f represents the front end of the rotation locus 8d, and the straight line 8fL is a vertical straight line passing through the front end 8f of the rotation locus 8d. The straight line 13rL is a vertical straight line passing through the rear end 13r of the motor 13. The fuel injection valve 12 and the throttle valve 11 are arranged behind the front end 8f of the rotation locus 8d of the intake cam 8 and in front of the rear end 13r of the motor 13.

In FIG. 6, the straight line 8cL is a vertical straight line passing through the rotation center 8c of the intake cam 8. The straight line 13cL is a vertical straight line passing through the center 13c of the motor 13. The center 13c of the motor 13 is the center of rotation of the rotor (not shown) of the motor 13. The fuel injection valve 12 and the throttle valve 11 are arranged behind the rotation center 8c of the intake cam 8 and in front of the center 13c of the motor 13.

In FIG. 6, the straight line 1cL is a vertical straight line passing through the rotation center 1c of the crankshaft 1. The fuel injection valve 12 and the throttle valve 11 are arranged behind the rotation center 8c of the intake cam 8 and in front of the rotation center 1c of the crankshaft 1.

As shown in FIG. 3, at least a part of the motor 13 overlaps with the side frame 27 in the side view of the vehicle. Further, when viewed from the side of the vehicle, at least a part of the throttle valve 11 overlaps with the side frame 27. When viewed from the side of the vehicle, at least a part of the fuel injection valve 12 overlaps with the side frame 27. In the side view of the vehicle, at least a part of the intake cam 8 overlaps with the side frame 27. Here, when viewed from the side of the vehicle, the entire fuel injection valve 12 overlaps the side frame 27, and the entire intake cam 8 overlaps the side frame 27.

As shown in FIG. 6, in the side view of the vehicle, a straight line passing through the rotation center 8c of the intake cam 8 and perpendicular to the cylinder axis 4c is defined as the first line L1. In the side view of the vehicle, the straight line passing through the center 6c of the intake port 6 and perpendicular to the cylinder axis 4c is defined as the second line L2. The injection hole 12a of the fuel injection valve 12, the center 11c of the throttle valve 11, and the center 13c of the motor 13 are arranged between the first line L1 and the second line L2. Here, in the vehicle side view, the injection hole 12a of the fuel injection valve 12, the entire throttle valve 11, and the entire motor 13 are arranged between the first line L1 and the second line L2. ..

As shown in FIG. 3, the air cleaner 35 has an air cleaner case 17 and an element 45 arranged inside the air cleaner case 17. The air cleaner case 17 has an inflow port 17b into which air flows in and a connection port 17a to which the intake pipe 10 is connected. The upper portion of the intake pipe 10 is inserted into the inside of the air cleaner case 17 through the connection port 17a. The air flows into the inside of the air cleaner case 17 from the inflow port 17b, is purified by passing through the element 45, and then is sucked into the intake pipe 10.

The motor 13, the throttle valve 11, the fuel injection valve 12, and the intake cam 8 are located below the air cleaner 35. The motor 13, the throttle valve 11, the fuel injection valve 12, and the intake cam 8 are arranged behind the front end of the air cleaner case 17 and in front of the rear end.

In FIG. 5, the straight line 17uL is a horizontal line passing through the upper end 17u of the connection port 17a of the air cleaner case 17. The straight line 17dL is a horizontal line passing through the lower end 17d of the connection port 17a of the air cleaner case 17. At least a part of the fuel injection valve 12 is located below the upper end 17u of the connection port 17a of the air cleaner case 17 and above the lower end 17d.

In FIG. 5, the virtual line represented by the reference numeral 19d represents the rotation locus of the crank pin 19. That is, the crankpin 19 turns around the center of the crankshaft 1 as the crankshaft 1 rotates, but the virtual line 19d follows a trajectory drawn by the contour of the portion of the crankpin 19 farthest from the center of the crankshaft 1. Represents. The straight line 19fL is a vertical straight line passing through the front end 19f of the rotation locus 19d of the crank pin 19. The straight line 19rL is a vertical straight line passing through the rear end 19r of the rotation locus 19d of the crank pin 19. At least a part of the connection port 17a of the air cleaner case 17, at least a part of the throttle valve 11, and at least a part of the motor 13 are rearward of the front end 19f of the rotation locus 19d of the crank pin 19 and the rear end 19r. It is located in front of.

In FIG. 5, the straight line L3 is a straight line passing through the center 13c of the motor 13 and parallel to the cylinder axis 4c in the side view of the vehicle. In the side view of the vehicle, the straight line L3 passing through the center 13c of the motor 13 and parallel to the cylinder axis 4c overlaps with the air cleaner case 17.

The above is the configuration of the motorcycle 50. Next, various effects of the motorcycle 50 according to the present embodiment will be described.

According to the motorcycle 50 according to the present embodiment, as shown in FIG. 3, the cylinder body 3 and the cylinder head 5 of the engine 15 extend forward and upward from the crankcase 2, and the intake pipe 10 extends upward from the cylinder head 5. It is extending. Therefore, there is no room in front of the intake pipe 10 near the cylinder head 5. When viewed from the side of the vehicle, there is only a small V-shaped space between the intake pipe 10 and the cylinder head 5.

However, in the present embodiment, the motor 13 which was conventionally arranged in front of the intake pipe 10 is arranged behind the intake pipe 10. Therefore, the motor 13 can be arranged in the portion of the intake pipe 10 close to the cylinder head 5.

Further, in the present embodiment, the fuel injection valve 12, which was conventionally arranged behind the intake pipe 10, is arranged in front of the intake pipe 10. As a result, the fuel injection valve 12 and the motor 13 did not interfere with each other, and the fuel injection valve 12 could be arranged compactly.

Further, according to the present embodiment, as shown in FIG. 6, at least a part of the fuel injection valve 12 and at least a part of the throttle valve 11 are arranged below the upper end 13a of the motor 13 and above the lower end 13b. Has been done. The overall vertical dimensions of the motor 13, the fuel injection valve 12, and the throttle valve 11 are small. Therefore, the engine 15 can be miniaturized, and the motorcycle 50 can be miniaturized.

According to the present embodiment, since the motor 13 can be arranged in the portion of the intake pipe 10 close to the cylinder head 5, the throttle does not need to lengthen the power transmission path between the motor 13 and the throttle valve 11. The valve 11 can be arranged at a position close to the cylinder head 5. Therefore, the distance between the throttle valve 11 and the intake port 6 can be shortened. As a result, the engine 15 can be miniaturized, the responsiveness of the output of the engine 15 to a change in the opening degree of the throttle valve 11 can be improved, and the performance of the engine 15 can be improved.

Further, according to the present embodiment, at least a part of the intake cam 8 is arranged below the upper end 13a of the motor 13 and above the lower end 13b. Therefore, the overall vertical dimensions of the motor 13, the fuel injection valve 12, the throttle valve 11, and the cylinder head 5 (specifically, the portion of the cylinder head 5 where the intake cam 8 is provided) can be suppressed, so that the engine can be suppressed. 15 can be further miniaturized.

Although not particularly limited, according to the present embodiment, the rotation center 8c of the intake cam 8, the injection hole 12a of the fuel injection valve 12, and the rotation center 11c of the throttle valve 11 are the upper end 13a of the motor 13. It is arranged below and above the lower end 13b. As a result, the engine 15 can be further miniaturized.

According to the present embodiment, the fuel injection valve 12 and the throttle valve 11 are arranged behind the front end 8f of the rotation locus of the intake cam 8 and in front of the rear end 13r of the motor 13. Although not particularly limited, the fuel injection valve 12 and the throttle valve 11 are arranged behind the rotation center 8c of the intake cam 8 and in front of the center 13c of the motor 13. The fuel injection valve 12 and the throttle valve 11 are arranged behind the rotation center 8c of the intake cam 8 and in front of the rotation center 1c of the crankshaft 1. According to the present embodiment, the motor 13, the throttle valve 11, the fuel injection valve 12, and the intake cam 8 as a whole have small front-rear dimensions. Therefore, the engine 15 can be further miniaturized.

According to the present embodiment, in the vehicle side view, the injection hole 12a of the fuel injection valve 12, the center 11c of the throttle valve 11 and the center 13c of the motor 13 pass through the rotation center 8c of the intake cam 8 and the cylinder axis 4c. It is arranged between the vertical first line L1 and the second line L2 that passes through the center 6c of the intake port 6 and is perpendicular to the cylinder axis 4c. Although not particularly limited, when viewed from the side of the vehicle, the injection hole 12a of the fuel injection valve 12, the entire throttle valve 11, and the entire motor 13 are between the first line L1 and the second line L1. Is located in. According to the present embodiment, the overall dimensions of the motor 13, the throttle valve 11, the fuel injection valve 12, and the intake cam 8 can be suppressed with respect to the direction along the cylinder axis 4c. Therefore, the engine 15 can be further miniaturized.

According to the present embodiment, as shown in FIG. 3, the center line 10c of the intake pipe 10 is located behind the rotation center 8c of the intake cam 8 and in front of the rear end 13r of the motor 13. According to this embodiment, the size of the intake pipe 10 in the front-rear direction is small. Therefore, the engine 15 can be further miniaturized.

According to the present embodiment, as shown in FIG. 5, the angle θ1 of the angle formed by the cylinder axis 4c with the horizontal line PL is 45 degrees or more in the side view of the vehicle. In the motorcycle 50, since the cylinder 4 has a large inclination, the space between the cylinder body 3 and the cylinder head 5 and the intake pipe 10 is small. Therefore, the above-mentioned effect such that the motor 13 can be arranged in the portion of the intake pipe 10 close to the cylinder head 5 becomes particularly remarkable.

According to the present embodiment, as shown in FIG. 6, the angle θ2 of the angle formed by the axis 12c of the fuel injection valve 12 with the horizontal line PL is the angle θ1 of the angle formed by the cylinder axis 4c with the horizontal line PL (FIG. 6). 5) is larger. The fuel injection valve 12 is arranged in a posture along the more vertical direction. Therefore, the size of the fuel injection valve 12 in the front-rear direction is small. Therefore, the fuel injection valve 12 can be compactly arranged in a small V-shaped space between the cylinder head 5 and the intake pipe 10.

According to the present embodiment, at least a part of the fuel injection valve 12 is arranged in front of the intake pipe 10, and at least a part of the motor 13 is arranged behind the intake pipe 10. Therefore, the side frame 27 can be arranged on the side of the intake pipe 10 without being disturbed by the fuel injection valve 12 and the motor 13. According to the present embodiment, at least a part of the throttle valve 11, at least a part of the fuel injection valve 12, and at least a part of the motor 13 overlap with the side frame 27 in the side view of the vehicle (see FIG. 3). It is compactly arranged on the side of the side frame 27. The overall vertical dimensions of the throttle valve 11, the fuel injection valve 12, the motor 13, and the side frame 27 are small. As a result, the motorcycle 50 can be miniaturized.

By the way, in the present embodiment, since the fuel injection valve 12 is arranged in front of the intake pipe 10, the fuel hose 16 connecting the fuel tank 14 arranged behind the intake pipe 10 and the fuel injection valve 12 is used. It is necessary to extend from the rear to the front of the intake pipe 10. However, according to the present embodiment, the fuel hose 16 extends from the fuel tank 14 toward the fuel injection valve 12 through the side of the intake pipe 10. Since the motor 13 is arranged behind the intake pipe 10, it is possible to easily prevent the fuel hose 16 and the motor 13 from interfering with each other.

According to the present embodiment, as shown in FIG. 5, at least a part of the connection port 17a of the air cleaner case 17, at least a part of the throttle valve 11, and at least a part of the motor 13 rotate the crank pin 19. It is located behind the front end 19f of the locus 19d and in front of the rear end 19r. The overall front-rear dimension of the connection port 17a of the air cleaner case 17, the throttle valve 11, and the motor 13 is small. Therefore, the motorcycle 50 can be miniaturized.

According to the present embodiment, at least a part of the fuel injection valve 12 is located below the upper end 17u of the connection port 17a of the air cleaner case 17 and above the lower end 17d. The vertical distance between the connection port 17a of the air cleaner case 17 and the fuel injection valve 12 is short. Therefore, the motorcycle 50 can be miniaturized.

According to the present embodiment, the straight line L3 passing through the center 13c of the motor 13 and parallel to the cylinder axis 4c overlaps with the air cleaner case 17 in the vehicle side view. The motor 13 is arranged near the air cleaner case 17. Since the motor 13 and the air cleaner case 17 can be arranged compactly, the motorcycle 50 can be miniaturized.

According to the present embodiment, as shown in FIG. 6, the fuel injection valve 12 is a mixed flow injector in which the injection direction 12s is inclined from the axis 12c of the fuel injection valve 12 toward the intake port 6. The fuel injection valve 12 is arranged so that a straight line extending from the injection hole 12a in the injection direction 12s intersects the umbrella portion 42 of the intake valve 7. Therefore, the fuel can be effectively injected toward the intake port 6.

Although one embodiment has been described above, the above-described embodiment is merely an example, and various other embodiments are possible.

The internal combustion engine may be a multi-cylinder internal combustion engine having a plurality of cylinders 4, or may be a single-cylinder internal combustion engine having only one cylinder 4. The internal combustion engine may be a water-cooled internal combustion engine or an air-cooled internal combustion engine.

The side frame 27 does not necessarily have to overlap at least a part of the throttle valve 11, at least a part of the fuel injection valve 12, and at least a part of the motor 13 in the side view of the vehicle.

The fuel injection valve 12 does not have to be a mixed flow injector. The straight line extending in the injection direction 12s of the fuel injection valve 12 does not have to intersect with the umbrella portion 42 of the intake valve 7.

A saddle-mounted vehicle is a vehicle on which an occupant straddles. A motorcycle is an example of a saddle-mounted vehicle, but a saddle-mounted vehicle is not limited to a motorcycle. Saddle-type vehicles include motorcycles, tricycles, ATVs (All Terrain Vehicles), and the like.

The terms and expressions used herein are for illustration purposes only and not for limited interpretation. It must be recognized that it does not preclude any equivalent of the features shown and stated herein, but allows various modifications within the claimed scope of the invention. The present invention can be embodied in many different forms. This disclosure should be considered as providing an embodiment of the principles of the invention. Embodiments are described herein with the understanding that those embodiments are not intended to limit the invention to the preferred embodiments described and / or illustrated herein. It is not limited to the embodiments described here. The present invention also includes any embodiment, including equal elements, modifications, deletions, combinations, improvements and / or modifications that can be recognized by those skilled in the art based on this disclosure. The limitations of a claim should be broadly construed on the basis of the terms used in that claim and should not be limited to the embodiments described herein or in the process of the present application.

1 ... Crankshaft, 2 ... Crankcase, 3 ... Cylinder body, 4 ... Cylinder, 5 ... Cylinder head, 6 ... Intake port, 7 ... Intake valve, 8 ... Intake cam, 9 ... Intake port, 10 ... Intake pipe, 11 ... Throttle valve, 12 ... Fuel injection valve, 12a ... Injection hole, 13 ... Motor, 14 ... Fuel tank, 15 ... Internal combustion engine, 16 ... Fuel hose, 17 ... Air cleaner case, 17a ... Connection port, 18 ... Piston, 19 ... Crankpin, 20 ... connecting rod, 22 ... body frame, 27 ... side frame, 42 ... umbrella part, 43 ... stem, 50 ... motorcycle (saddle-type vehicle)

Claims (19)

A crankcase that rotatably supports the crankshaft that extends in the vehicle width direction,
A cylinder body extending forward and upward from the crankcase,
The cylinder formed inside the cylinder body and
With the cylinder head connected to the cylinder body,
An intake port formed inside the cylinder head and opening toward the inside of the cylinder,
An intake valve that is supported by the cylinder head and opens and closes the intake port,
An intake cam that is rotatably supported by the cylinder head and drives the intake valve,
An intake port formed inside the cylinder head and connected to the intake port,
An intake pipe that is connected to the cylinder head, extends upward from the cylinder head, and connects to the intake port.
A throttle valve arranged inside the intake pipe and
A fuel injection valve having an injection hole arranged between the throttle valve and the intake port,
An internal combustion engine having a motor connected to the throttle valve and driving the throttle valve.
At least a portion of the fuel injection valve is located in front of the intake pipe.
At least a portion of the motor is located behind the intake pipe.
A saddle-type vehicle in which at least a part of the fuel injection valve and at least a part of the throttle valve are arranged below the upper end and above the lower end of the motor. The saddle-type vehicle according to claim 1, wherein at least a part of the intake cam is arranged below the upper end of the motor and above the lower end. Claim 1 or 2 in which the rotation center of the intake cam, the injection hole of the fuel injection valve, and the rotation center of the throttle valve are arranged below the upper end and above the lower end of the motor. The saddle-mounted vehicle described in. The fuel injection valve and the throttle valve are arranged behind the front end of the rotation locus of the intake cam and in front of the rear end of the motor, according to any one of claims 1 to 3. Saddle-type vehicle. The saddle riding according to any one of claims 1 to 4, wherein the fuel injection valve and the throttle valve are arranged behind the rotation center of the intake cam and in front of the center of the motor. Type vehicle. The fuel injection valve and the throttle valve are arranged behind the rotation center of the intake cam and in front of the rotation center of the crankshaft, according to any one of claims 1 to 5. A saddle-mounted vehicle. In the side view of the vehicle, the straight line passing through the center of rotation of the intake cam and perpendicular to the axis of the cylinder is referred to as the first line, and the straight line passing through the center of the intake port and perpendicular to the axis of the cylinder is referred to as the second line. When the fuel injection valve, the injection hole, the center of the throttle valve, and the center of the motor are arranged between the first line and the second line, claims 1 to 1. The saddle-mounted vehicle according to any one of 6. Claim 1 in which the injection hole of the fuel injection valve, the entire throttle valve, and the entire motor are arranged between the first line and the second line in a vehicle side view. The saddle-mounted vehicle according to any one of 7 to 7. The saddle-type vehicle according to any one of claims 1 to 8, wherein the center line of the intake pipe is located behind the rotation center of the intake cam and in front of the rear end of the motor. The saddle-type vehicle according to any one of claims 1 to 9, wherein the angle between the axis of the cylinder and the horizontal line is 45 degrees or more when viewed from the side of the vehicle. The saddle riding according to any one of claims 1 to 10, wherein the angle of the angle formed by the axis of the fuel injection valve with the horizon is larger than the angle of the angle formed by the axis of the cylinder with the horizon in the side view of the vehicle. Type vehicle. A vehicle body frame that supports the internal combustion engine is provided.
Any of claims 1 to 11, wherein the vehicle body frame has a side frame that overlaps at least a part of the throttle valve, at least a part of the fuel injection valve, and at least a part of the motor in a vehicle side view. The saddle-mounted vehicle described in one. A fuel tank located behind the intake pipe and
A fuel hose connected to the fuel tank and the fuel injection valve is provided.
The saddle-mounted vehicle according to any one of claims 1 to 12, wherein a part of the fuel hose is arranged on the side of the intake pipe. The saddle-type vehicle according to any one of claims 1 to 13, further comprising an air cleaner case having a connection port to which the intake pipe is connected. The internal combustion engine
With the piston arranged in the cylinder,
With the crank pin provided on the crankshaft,
A connecting rod connected to the piston and the crank pin.
At least a part of the connection port of the air cleaner case, at least a part of the throttle valve, and at least a part of the motor are rearward of the front end and front of the rear end of the rotation locus of the crankpin. The saddle-type vehicle according to claim 14, which is located in. The saddle-type vehicle according to claim 14 or 15, wherein at least a part of the fuel injection valve is located below the upper end of the connection port of the air cleaner case and above the lower end. The saddle-type vehicle according to any one of claims 14 to 16, wherein a straight line passing through the center of the motor and parallel to the axis of the cylinder overlaps with the air cleaner case when viewed from the side of the vehicle. The saddle-mounted vehicle according to any one of claims 1 to 17, wherein the fuel injection valve is a diagonal flow injector whose injection direction is inclined from the axis of the fuel injection valve toward the intake port. The intake valve comprises a poppet valve including an umbrella portion that closes the intake port and a rod-shaped stem extending from the umbrella portion.
The saddle-type vehicle according to claim 18, wherein the fuel injection valve is arranged so that a straight line extending from the injection hole in the injection direction intersects the umbrella portion.

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