JP2005153877A - Motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motorcycle having an engine unit reduced in size and a radiator suitably arranged. <P>SOLUTION: In the motorcycle 1, a car body frame 2 between a head pipe 3 supporting the front wheel 4 capable of steering it to right and left and the drive seat 20 for seating an occupant and a car body cover 24 are curved downward into a substantially U shape to form a foot passing space 26, a front fender is provided to the front wheel 4 rotatably provided, an engine main body 29 equipped with a cylinder assembly 33 and a crank case at the back of the front fender and an engine unit 13 equipped with a transmission part 30 are mounted to the car body, and an inlet device 57 is provided to the upper part of the cylinder assembly 33. A fixing part for fixing the engine unit 13 is provided to the car body frame 2 near the lowest part where the car body cover 24 is curved into a substantially U shape, the cylinder assembly 33 is arranged at a position in front of the fixing part with its axial line 37 rising forward rather than a horizontal level in a forward tilting state, while the inlet device 57 and a radiator 102 are arranged in front of the fixing part and above the axial line 37 of the cylinder assembly 33. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a motorcycle.

  In recent years, scooter-type motorcycles have become increasingly difficult to apply to a conventional swing-type engine unit that integrates an engine and a power transmission unit in a swingable manner due to the increase in size of the vehicle body and the engine. . The reason for this is that as the engine becomes larger, the engine unit becomes longer, the overall length of the vehicle becomes longer, the center of gravity of the vehicle shifts to the rear, the load sharing on the front wheels is reduced, and steering performance and running stability are reduced. There is a problem that decreases.

  Therefore, in recent years, there is a type in which the engine unit can be disposed closer to the front of the vehicle body by fixing the engine unit to the vehicle body side, and separating a part of the power transmission part and swingably attaching to the vehicle body (for example, Patent Document 1).

  In general, the engine unit has a power generation part, a transmission part, and a part of the power transmission part integrally incorporated in the unit case.

On the other hand, when the engine adopts a water cooling method, it is necessary to provide a radiator for cooling the cooling water. The radiator is arranged in front of the engine unit so that the traveling wind can easily hit. In the case of a scooter type motorcycle, the radiator is often arranged in the front lower part of the engine unit because of its unique body cover shape.
Japanese Patent Laid-Open No. 11-129969

  However, when the power generation unit, the transmission unit, and the power transmission unit are arranged in series inside the unit case of the engine unit, the total length of the engine unit becomes longer, the vehicle wheelbase becomes longer, the vehicle becomes larger, and the small turn becomes smaller. It becomes difficult to work.

  In addition, if the radiator is placed at the front lower part of the engine unit, it will be difficult to secure the bank angle, mud that the front wheels will jump up will be easily attached to the radiator, and the front wheels will block the running wind and reduce the cooling efficiency Problems arise.

  The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a motorcycle in which the engine unit is downsized.

  Another object of the present invention is to provide a motorcycle having a suitable arrangement of radiators.

  In order to solve the above-described problem, a motorcycle according to the present invention has a vehicle body frame between a head pipe that supports a front wheel so that it can be steered left and right and a driver seat for occupant seating. And a vehicle body cover that is bent downward in a substantially U shape to form a foot-through space, a front fender is provided on the front wheel that is rotatably provided, and an engine body that includes a cylinder assembly and a crankcase behind the front fender; In a motorcycle in which an engine unit including a transmission unit is mounted on the vehicle body and an intake device is provided above the cylinder assembly, the vehicle body cover is curved in a substantially U shape. Provided in the body frame near the lowermost part, and the cylinder assembly is placed forward of the fixed part and the axis thereof from the horizontal. While disposed forwardly inclined state of and forwardly and upwardly, the intake device and the radiator, in which is arranged above the axis of the forward and the cylinder assembly of the fixed part.

  In order to solve the above-described problem, as described in claim 2, the intake device includes an air cleaner, an intake pipe, and a fuel injection device, and the intake pipe is provided from the air cleaner provided in the vicinity of the head pipe. The fuel injection device is provided in the lower portion and the fuel injection device is provided at an intermediate portion thereof, while the axis of the internal passage of the intake pipe is inclined toward the head pipe in a side view and is curved in the substantially U shape. It is set so as to cross the axis of the cylinder assembly in front of the lowest part of the through space.

  Furthermore, in order to solve the above-mentioned problem, as described in claim 3, the radiator for cooling the engine body is provided between the front fender and the vehicle body frame curved in a substantially U shape in a side view. The radiator is provided above the cylinder head of the cylinder assembly, and the radiator and the intake device are both disposed in front of the foot passage space.

  Furthermore, in order to solve the above-described problem, as described in claim 4, the fuel injection device of the intake device is attached between the intake pipe and the radiator, and is downstream of the fuel injection device. The axis of the intake pipe on the side is connected to the intake port of the cylinder head in a substantially straight state in the vertical direction.

  In order to solve the above-described problem, as described in claim 5, an engine starter is provided in the vicinity of the fixed portion above the engine body, and the fixed portion is sandwiched between the intake device. The fuel tank and the article storage chamber are arranged below the operation seat at the rear.

  As described above, according to the motorcycle according to the present invention, it is possible to arrange the radiator without lengthening the wheel base, and the overall length of the engine unit can be shortened. Further, since the intake passage can be connected to the intake port in a substantially straight state, the intake efficiency is increased and the output of the engine is improved. Furthermore, mud and the like that the front wheel jumps are less likely to adhere to the radiator, and the traveling wind is not blocked by the front wheel, thereby improving the cooling efficiency.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a left side view showing an example of a motorcycle to which the present invention is applied. FIG. 2 is a left side view showing the internal structure of the motorcycle. As shown in FIGS. 1 and 2, the scooter type motorcycle 1 has a body frame 2, and a head pipe 3 is provided at the front end of the body frame 2. The head pipe 3 is provided with a front fork 5, a front fender 6, a handle bar 7, and the like that rotatably support the front wheel 4, and the front wheel 4 is steered to the left and right by the handle bar 7.

  From the rear part of the head pipe 3, a pair of upper and lower down tubes 8a, 8b are extended obliquely downward rearward. The lower down tube 8a extending from the rear lower part of the head pipe 3 once extends substantially vertically downward, then bends substantially horizontally and extends rearward, and the rear end portion extends obliquely upward. .

  Further, the center frame 9 extends obliquely upward and rearward from the middle of the substantially vertical portion of the lower down tube 8a, and the subframe 10 extends from the rear end portion toward the rear end portion of the lower down tube 8a. , 10 are combined. And the pivot part 11 is provided in this coupling | bond part.

  Further, a seat frame 12 extends obliquely upward from the rear upper part of the subframe 10.

  On the other hand, the upper down tube 8 b extending from the rear upper part of the head pipe 3 extends downward in parallel with the lower down tube 8 a and is joined to the vicinity of the front end of the center frame 9.

  The engine unit 13 is mounted in a space surrounded by the lower down tube 8 a, the center frame 9, and the subframe 10 of the vehicle body frame 2. A conduction unit 14 as a power transmission unit is disposed at the rear of the engine unit 13, and a front part of the transmission unit 14 is pivotally attached to the pivot unit 11.

  The conduction unit 14 also serves as a swing arm, and is elastically and swingably supported by the vehicle body frame 2 by a shock absorber 15. A rear wheel 16 that is a driving wheel is held at the rear end of the transmission unit 14.

  Above the rear wheel 16, there are provided helmet storage chambers 19, which are storage containers for helmets 17 and 18, luggage (not shown), tools, and the like. Further, an occupant seating operation seat 20 that also serves as a lid of the article storage chamber 19 is installed above the article storage chamber 19 so as to be freely opened and closed. The driving seat 20 is divided into two parts, a driver's seat 20a and a passenger's seat 20b.

  On the other hand, the article storage chamber 19 is also divided into two parts, a front chamber 19a immediately below the driver's seat 20a and a rear chamber 19b directly below the passenger's seat 20b. The floor surface 21a of the front chamber 19a is formed to be rearwardly lowered, and is formed so that the helmet 17 can be stored in a forward-facing state. On the other hand, the floor surface 21b of the rear chamber 19b is formed so as to be rearwardly raised so that the helmet 18 can be stored in a rearward state.

  Further, a fuel tank 22 is disposed in the space between the lower part of the article storage chamber 19, the pivot portion 11 and the rear wheel 16, and its fuel supply pipe 23 is located between the front chamber 19 a and the rear chamber 19 b of the article storage chamber 19. Placed in space. The vehicle body frame 2 is covered with a vehicle body cover 24 that is, for example, a synthetic resin molded product, and an oil supply port 25 of the oil supply pipe 23 faces the side surface thereof.

  The vehicle body frame 2 and the vehicle body cover 24 between the head pipe 3 and the front portion of the driving seat 20 are bent downward in a substantially U shape to form a foot passage space 26 extending in the width direction of the vehicle body. A low floor rider footrest floor 27a on which the driver puts his / her foot on the left and right is formed. Further, a pillion rider footrest floor 27b on which a passenger rests his / her foot is formed behind the left and right rider footrest floors 27a. Further, a tunnel-shaped engine tunnel 28 is formed at the center of the rider footrest floor 27a so as to extend forward and backward and protrude upward.

  FIG. 3 is a schematic plan view of the motorcycle 1 shown in FIGS. 1 and 2. The engine unit 13 and the transmission unit 14 are shown in a plane sectional view along the line III-III in FIG. This is indicated by a two-dot chain line). 4 is an enlarged plan sectional view of the engine unit 13, and FIG. 5 is an enlarged left side view (partially a longitudinal sectional view) of the engine unit 13. As shown in FIG.

  As shown in FIGS. 2 to 5, the engine unit 13 is mainly divided into an engine main body 29 that is a power generation unit, a transmission unit 30 that is a transmission unit, and a differential unit 31 that is a part of the power transmission unit. Is done. The engine body 29 is mainly composed of a crankcase 32 and a cylinder assembly 33 disposed in the engine tunnel 28 at the upper front of the crankcase 32. As shown in detail in FIG. 5, the engine body 29 is fixed to the body frame 2 with bolts 34, for example, at the upper part, the front lower part and the rear lower part of the crankcase 32, and as shown in FIG. 4, The center axis 35 of the engine body 29 extending in the traveling direction of the vehicle body is arranged offset from the center line 36 extending in the front-rear direction of the vehicle body to the left side in the traveling direction of the vehicle body in this embodiment.

  As shown in FIG. 2, the cylinder assembly 33 is disposed in a forward tilted state slightly upward from the horizontal so that its axis 37 is directed between the head pipe 3 and the upper edge of the front wheel 4. It arrange | positions so that it may face between 8a and 8b.

  The cylinder head 38 above the cylinder assembly 33 is formed with a combustion chamber 41 aligned with a cylinder 40 formed horizontally in the cylinder block 39 below the cylinder head 38. The engine body 29 used in the present embodiment is a so-called parallel two-cylinder engine in which two cylinders 40 sharing one crankshaft 42 extending in the vehicle width direction in the crankcase 32 are arranged side by side. .

  A piston 43 is slidably inserted into the cylinder 40, and the piston 43 and the crankshaft 42 are connected by a connecting rod 44. The reciprocating stroke of the piston 43 is configured to be converted into the rotational motion of the crankshaft 42.

  On the other hand, an intake port 45 and an exhaust port 46 connected to the combustion chamber 41 are formed in the cylinder head 38. In addition, an intake valve 47 and an exhaust valve 48 for opening and closing both ports 45 and 46 are disposed in the cylinder head 38, and camshafts 49 a and 49 b for opening and closing these valves 47 and 48 are also provided in the cylinder head 38. Be placed. The engine body 29 used in this embodiment has a DOHC type valve mechanism 50 in which independent camshafts 49a and 49b are arranged in the vertical direction for intake and exhaust.

  The intake port 45 is provided on the upper side of the cylinder head 38, and for example, an intake pipe 52 including a fuel injection device 51 is connected thereto. For example, as shown in FIG. 5, the intake pipe 52 has an intake passage 53 that is connected to the intake port 45 in a substantially linear state, and its central axis 54 is above the head pipe 3 and is connected to the axis 55 of the head pipe 3. The arrangement angle is set so as to intersect. Further, an air cleaner 56 is disposed in the space above the cylinder head 38, and the upstream end of the intake pipe 52 is connected to the air cleaner 56. The air cleaner 56, the intake pipe 52, the fuel injection device 51, and the like constitute an intake device 57.

  On the other hand, the exhaust port 46 is provided on the lower side of the cylinder head 38 and is connected to the base end portion of the exhaust pipe 58. The exhaust pipe 58 extends rearward around the lower part of the engine. Further, a muffler 59 is connected to the downstream end of the exhaust pipe 58.

  By the way, a balancer chamber 60 is formed above the crankshaft 42 of the crankcase 32, and a balancer device 61 is disposed in the balancer chamber 60. The balancer device 61 has a balancer shaft 63 provided with a balancer weight 62, and the balancer shaft 63 is disposed above the crankshaft 42 and in parallel with the crankshaft 42. The balancer shaft 63 is connected to a starter motor 64 that is an engine starting device.

  A primary drive gear 65 that also serves as a balancer drive gear is provided at one end of the crankshaft 42, in the left end in the present embodiment, and a balancer driven gear 66 is provided at one end of the balancer shaft 63. These balancer gears 65, 66 Are operatively connected, and the rotation of the crankshaft 42 is transmitted to the balancer shaft 63. A power generator 67 is also provided at the end of the crankshaft 42.

  The crankcase 32 behind the primary drive gear 65 extends rearward to form a crankcase 32 having a substantially L shape in plan view, and is pivotally supported by a pair of bearings 69 inside the extended portion 68. The first connecting shaft 70 is disposed in parallel with the crankshaft 42. A primary driven gear 71 is provided on the first connecting shaft 70, and the primary driven gear 71 is operatively connected to a primary drive gear 65 provided on the crankshaft 42, so that rotation of the crankshaft 42 is transmitted to the first connecting shaft 70. .

  A water pump 72 for circulating cooling water for cooling the engine, which will be described later, is connected to one end of the first connecting shaft 70, in this embodiment, the left end, while the other end, in this embodiment, the right end is the crankcase 32. Protruding outside.

  A mission unit 30 is disposed behind the crankcase 32 and below the driver's seat 20a. The mission unit 30 includes a mission case 73 in which a V-belt type automatic transmission 74 is disposed. The transmission 74 includes a drive pulley 75, a drive shaft 77 rotatably supported in the mission case 73 by a bearing 76, and a driven pulley 78, and a shaft rotatably supported in the mission case 73 by a bearing 79. The drive shaft 77 is supported behind the crankshaft 42 and is coaxially arranged with the first connection shaft 70 at a position facing the first connection shaft 70 in the width direction of the vehicle body. In addition, a driven shaft 80 is disposed behind the drive shaft 77 in parallel with the drive shaft 77.

  The end of the drive shaft 77 that faces the first connection shaft 70, in this embodiment, the left end, protrudes out of the transmission case 73 and is splined to the first connection shaft 70, for example. A V belt 81 is stretched between the drive pulley 75 and the driven pulley 78, and the rotational driving force of the engine body 29 is transmitted to the driven pulley 78 via the V belt 81.

  The transmission case 73 is formed in a substantially L shape in a plan view like the crankcase 32, and the inner side of the folding part of the transmission case 73 and the inner side of the folding part of the crankcase 32 face each other, so that the L-shaped longitudinal portion extends in the width direction of the vehicle body. As shown in FIG. 4, the belt line 82 of the V-belt 81 stretched between the drive pulley 75 and the driven pulley 78 extends from the center line 36 extending in the front-rear direction of the vehicle body 29. Is arranged on the opposite side to the central axis 35, in the present embodiment, offset to the right in the traveling direction of the vehicle body.

  Further, as shown in detail in FIG. 5, the front four portions of the transmission case 73 are on the side of the extending portion 68 of the crankcase 32, and the rear one portion of the transmission case 73 is on the vehicle body frame 2 with bolts 83, for example. Fixed.

  A differential portion 31 is disposed behind the extended portion 68 of the crankcase 32. The differential portion 31 includes a differential case 84, and a second connection shaft 86 that is rotatably supported by a bearing 85 is provided therein. The second connecting shaft 86 is disposed coaxially with the driven shaft 80 at a position facing the driven shaft 80 in the width direction of the vehicle body, and both shafts 80 and 86 are spline-connected and decelerated by the transmission 74, for example. 29 rotational driving force is transmitted to the second connecting shaft 86.

  A secondary shaft 88 that is rotatably supported by a bearing 87 is disposed in parallel with the second connection shaft 86 in a differential case 84 substantially above the second connection shaft 86. The second connecting shaft 86 is provided with a secondary drive gear 89, and a secondary driven gear 90 is provided at one end of the secondary shaft 88. These secondary gears 89, 90 are operatively connected so that the rotational driving force of the engine body 29 is generated. It is transmitted to the secondary shaft 88.

  Further, a transmission shaft 92 rotatably supported by a bearing 91 is disposed in the differential case 84 so as to be orthogonal to the secondary shaft 88, and the rotation direction of the secondary shaft 88 is converted by 90 ° via a bevel gear 93, thereby transmitting the transmission shaft. 92.

  As shown in FIG. 4, the differential case 84 is opposite to the V-belt type automatic transmission 74 in the transmission case 73 across the center line 36 extending in the front-rear direction of the vehicle body. It is arranged offset to the left side in the direction. Further, as shown in detail in FIG. 5, for example, a plurality of bolts 94 are fixed to the rear left side surface of the mission case 73.

  The rotational driving force of the engine body 29 transmitted to the transmission shaft 92 is transmitted to the axle shaft 96 of the rear wheel 16 via the propeller shaft 95 which is another power transmission unit. The propeller shaft 95 is rotatably supported by a plurality of bearings 97 and is accommodated in the conduction unit 14. The conduction unit 14 is located on one side from the center line 36 extending in the front-rear direction of the vehicle body, and in the present embodiment, the muffler 59. They are arranged offset to the left in the direction of travel on the opposite side (see FIG. 3).

  Further, as described above, the conduction unit 14 is supported elastically and swingably on the vehicle body frame 2 by the shock absorber 15. The shock absorber 15 is disposed in a space surrounded by the engine unit 13, the transmission unit 14, and the rear wheel 16 in a side view, and in the vicinity of a pivoting portion of the transmission unit 14 to the pivot portion 11 in a plan view. The

  The propeller shaft 95 in the transmission unit 14 is divided into a front shaft 95a and a rear shaft 95b, and the transmission shaft 92 and the front shaft 95a are connected by, for example, a universal joint 98, so that the engine main body 29 is driven to rotate. The force is transmitted to the propeller shaft 95, and the transmission of the rotational force of the engine body 29 is not hindered even if the transmission unit 14 swings up and down around the pivot portion 11.

  On the other hand, a clutch mechanism 99, which is another power transmission unit, is disposed at a connecting portion between the front shaft 95a and the rear shaft 95b in the transmission unit 14. As this clutch mechanism 99, for example, an electromagnetically controlled wet multi-plate type is used.

  Here, although not shown in detail, the electromagnetically controlled wet multi-plate clutch mechanism 99 is a pilot clutch that can be electrically intermittently controlled and has a small transmission torque, and a main clutch that can transmit a larger torque than this pilot clutch. A rotation phase difference is generated between the main clutch and the pilot clutch, and the rotation phase difference is converted into a pressing force of the pressure plate of the main clutch by a cam mechanism provided in the pilot clutch. It is amplified together and enables transmission of a large torque. Since the electromagnetically controlled pilot clutch can be formed in a small size, the response of the clutch is improved, and at the same time, the size of the main clutch can be reduced, which leads to the size reduction of the entire engine. Note that a centrifugal clutch mechanism may be used instead of the electromagnetically controlled wet multi-plate clutch mechanism 99.

  Further, the axle shaft 96 is rotatably supported by the bearing 100 in the vicinity of the rear end portion of the rear shaft 95b, and the rotation direction of the propeller shaft 95 is changed by 90 ° via the bevel gear 101 and transmitted to the axle shaft 96. .

  By the way, the engine main body 29 mounted on the motorcycle 1 is water-cooled, and a radiator 102 for cooling the cooling water for cooling the engine main body 29 is disposed in a vehicle body cover 24 between the front wheels 4 and the engine. The

  6 is a cross-sectional view taken along the line VI-VI in FIG. As shown in FIGS. 3, 5, and 6, the radiator 102 is disposed in front of the intake device 57 and in front of the cylinder head 38. The radiator 102 is disposed with its lower part facing the front upper side of the camshaft 49b disposed on the lower side in the cylinder head 38.

  Further, as shown in FIG. 6, the radiator 102 has a planar shape in which a central portion is curved in an arcuate shape rearward along the rotation trajectory 103 of the rear end of the front fender 6, and the cooling water in the radiator 102 is A cooling fan 104 that forcibly cools the engine is disposed on the opposite side of the center axis 35 of the engine body 29 from the center line 36 extending in the front-rear direction of the vehicle body, in this embodiment, on the rear side of the radiator 102 on the right side in the vehicle body traveling direction. Is done.

  Further, an air guide plate 105 having an arcuate planar shape opposite to that of the radiator 102 is provided integrally or integrally with the air cleaner 56 in front of the intake pipe 52 of the intake device 57.

  Next, the operation of this embodiment will be described.

  If the crankcase 32, the transmission case 73, and the differential case 84 of the engine main body 29 are arranged along the center line 36 extending in the front-rear direction of the vehicle body, the overall length of the engine unit 13 is inevitably increased. The center axis 35 of the engine body 29 extending in the traveling direction is offset from the center line 36 extending in the front-rear direction of the vehicle body to one side (in the present embodiment, the left side in the traveling direction of the vehicle body). The belt line 82 of the V-belt 81 is offset from the center line 36 extending in the front-rear direction of the vehicle body to the side opposite to the center axis 35 of the engine body 29 (right side in the vehicle body traveling direction in this embodiment). At the same time, the differential case 84 is fitted with a center line 36 extending in the longitudinal direction of the vehicle. The total length of the engine unit 13 can be shortened by being offset on the opposite side to the V-belt type automatic transmission 74 in the case 73 (in the present embodiment, on the left side in the traveling direction of the vehicle body). In addition, the space on both sides of the engine unit 13 can be used effectively.

  Further, the cylinder assembly 33 provided at the foremost part of the engine unit 13 is disposed in a forward inclined state slightly upward from the horizontal so that the axis 37 is directed between the head pipe 3 and the upper edge of the front wheel 4. By facing between the down tubes 8a and 8b, the space in the engine tunnel 28 can be used effectively, and the overall length of the engine unit 13 can be further shortened. By shortening the overall length of the engine unit 13, the wheel base of the vehicle is shortened, the vehicle is made compact, and the operability is improved by using a small turn.

  Since the cylinder assembly 33 is disposed in the engine tunnel 28, it is possible to dispose an intake device 57 including the air cleaner 56, the intake pipe 52, and the fuel injection device 51 in the space above the engine assembly 28. As a result, the intake passage 53 in the intake pipe 52 can be set so that the central axis 54 intersects the axis 55 of the head pipe 3 above the head pipe 3, and the intake passage 53 is connected to the intake port 45 in a substantially straight state. It can be connected to increase the suction efficiency, leading to increased engine output.

  Further, the radiator 102 is disposed in front of the intake device 57, in front of and above the cylinder head 38, and the lower portion thereof faces in front of the cam shaft 49b disposed on the lower side in the cylinder head 38. The radiator 102 can be arranged without lengthening the wheel base, and even if the width of the radiator 102 is widened, a sufficient bank angle can be secured, thereby improving the cooling efficiency of cooling water and improving the cornering performance. it can.

  Furthermore, by arranging the radiator 102 at the above position, mud and the like that the front wheel 4 jumps are less likely to adhere to the radiator 102, and the traveling wind is not blocked by the front wheel 4, thereby improving the cooling efficiency. And since the front shape of the vehicle body cover 24 lower part can be made into an inverted triangle (not shown), an external appearance improves.

  Further, the radiator 102 is formed in a planar shape in which the central portion is curved in an arcuate shape rearward along the rotation trajectory 103 at the rear end of the front fender 6, so that the rear portion of the head pipe 3 is inclined obliquely downward to the rear. The span before and after the pair of upper and lower down tubes 8a and 8b that are extended can be increased. As a result, the rigidity of the body frame 2 is increased.

  Further, when the cooling fan 104 provided in the radiator 102 is disposed at the rear portion of the radiator 102, the center line 36 extending in the front-rear direction of the vehicle body is opposite to the center axis 35 of the engine body 29 (in this embodiment, the vehicle body traveling direction). Since the right side) has a larger space than the other side, a large cooling fan 104 can be attached.

  On the other hand, a space surrounded by the engine unit 13, the conduction unit 14, and the rear wheel 16 in a side view, the shock absorber 15 that elastically and swingably supports the conduction unit 14 also serving as a swing arm. The space above the conduction unit 14 between the engine unit 13 and the rear wheel 16 can be effectively used by arranging the conduction unit 14 at a position in the vicinity of the pivotal attachment portion of the conduction unit 14 to the pivot portion 11 in plan view.

  The fuel tank 22 is disposed in this space, that is, the space between the lower part of the article storage chamber 19, the pivot portion 11 and the rear wheel 16, thereby sufficiently securing the length of the conduction unit 14 (swing arm length). However, the car body can be kept compact.

  In addition, the article storage chamber 19 is divided into a front chamber 19a and a rear chamber 19b, and the front chamber 19a can store the helmet 17 in a forward-facing state, and the rear chamber 19b includes a helmet 18 therein. Is formed so that it can be stowed in the rearward direction, the seat height of the driving seat 20 can be lowered as compared with the case where both the helmets 17 and 18 are stowed in the opposite directions, and the rider's legability is improved.

  Furthermore, the floor surface 21a of the front chamber 19a is lowered downward and the floor surface 21b of the rear chamber 19b is rearwardly raised, so that the seat height can be further lowered and the helmets 17 and 18 are unidirectionally stored during storage. Since it slips and fits, the fit of the helmets 17 and 18 is improved.

  Since the fuel pipe 23 of the fuel tank 22 is disposed in the space between the front chamber 19a and the rear chamber 19b of the article storage chamber 19 and the fuel filler port 25 of the fuel pipe 23 faces the side surface of the vehicle body cover 24, The fuel supply pipe 23 and the fuel supply port 25 can be arranged at a position higher than the upper surface of the fuel tank 22, so that the capacity of the fuel tank 22 can be greatly increased, the driver's boarding is performed without opening the driving seat 20. Fuel can be supplied.

  In the above-described embodiment, an example in which the present invention is applied to the scooter type motorcycle 1 has been described. However, other types of small vehicles including a unit engine such as a small four-wheel drive vehicle for traveling on rough terrain. It is also applicable to.

1 is a left side view of a scooter type motorcycle showing an embodiment of a motorcycle according to the present invention. Fig. 2 is a left side view showing an internal structure of the motorcycle shown in Fig. 1. FIG. 3 is a schematic plan view of the motorcycle shown in FIGS. 1 and 2, and the engine unit and the transmission unit are shown in a plan sectional view taken along line III-III in FIG. 2. The expanded plane sectional view of an engine unit. The enlarged left view of an engine unit. Sectional drawing which follows the VI-VI line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 3 Head pipe 4 Front wheel 8a, 8b Down tube 11 Pivot part 13 Engine unit 14 Conduction unit 15 Shock absorber 16 Rear wheel 17, 18 Helmet 19 Article storage room 19a Front room 19b of article storage room Rear chamber 20 Driving seat 21a Front chamber floor 21b Rear chamber floor 22 Fuel tank 23 Refueling pipe 24 Body cover 25 Refueling port 26 Footing space 27a, 27b Footrest floor 28 Engine tunnel 29 Engine body 30 Mission section 31 Differential Portion 32 Crankcase 33 Cylinder assembly 35 Center axis 36 of engine body Center line 37 extending forward and backward of vehicle body Cylinder assembly axis 38 Cylinder heads 49a, 49b Camshaft 50 Valve mechanism 52 Intake pipe 5 Center axis 55 axis 57 intake device 74 V-belt type automatic transmission 81 V belt 102 radiator 104 cooling fan of the head pipe of the intake passage 54 intake passage

Claims (5)

The body frame and body cover between the head pipe that supports the front wheels so that they can be steered to the left and right and the occupant seating driving seat are curved downward in a substantially U shape to form a foot-through space, and are provided to be rotatable. The front wheel is provided with a front fender, and an engine unit including a cylinder assembly and a crankcase on the rear side and an engine unit including a transmission unit is mounted on the vehicle body, and an intake device is provided above the cylinder assembly. In a motorcycle, a fixing portion for fixing the engine unit is provided in the vehicle body frame near the lowermost portion where the vehicle body cover is curved in a substantially U shape, and the cylinder assembly is disposed in front of the fixing portion and the axis thereof is set horizontally. While the air intake device and the radiator are arranged in a slightly tilted forward and forward tilted state, Write and motorcycle, characterized in that arranged above the axis of the cylinder assembly. The intake device includes an air cleaner, an intake pipe, and a fuel injection device. The intake pipe is provided below the air cleaner provided in the vicinity of the head pipe, and the fuel injection device is provided in an intermediate portion thereof. The axis of the internal passage of the pipe is inclined toward the head pipe in a side view, and is set so as to intersect with the axis of the cylinder assembly in front of the lowermost part of the leg-passing space curved in a substantially U shape. The motorcycle according to claim 1. The radiator for cooling the engine body is provided between the front fender and the vehicle body frame curved in a substantially U shape in a side view and above the cylinder head of the cylinder assembly, and both the radiator and the intake device are The motorcycle according to claim 1 or 2, wherein the motorcycle is disposed in front of a foot-through space. The fuel injection device of the intake device is mounted between the intake pipe and the radiator, and the axis of the intake pipe downstream from the fuel injection device is substantially linear with the intake port of the cylinder head in the vertical direction. The motorcycle according to claim 1 or 2, connected by 2. An engine starting device is provided near the fixed portion above the engine body, and a fuel tank and an article storage chamber are disposed below the operation seat at the rear of the intake device with the fixed portion interposed therebetween. Or the motorcycle according to 2.

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