JP4530787B2 - Motorcycle - Google Patents

Description

  The present invention relates to a motorcycle in which at least a part of an air cleaner connected to the engine is disposed above a radiator disposed in front of an engine mounted on a vehicle body frame.

In order to reduce the influence of heat from the radiator on the fuel tank, a scooter type motorcycle is known which is a heat shielding plate arranged between the fuel tank and the radiator so as to guide the traveling wind to the radiator side. (For example, refer to Patent Document 1).
JP 2002-284072 A

  However, it is desirable to reduce the number of parts when cooling the radiator by guiding the driving wind to the radiator, and to improve the power performance of the engine, the driving wind is more efficiently sent to the radiator side. It is desirable to guide.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a motorcycle that can efficiently guide traveling wind to a radiator with a smaller number of parts.

To achieve the above object, a first aspect of the present invention, above a radiator arranged in front of an engine mounted on the vehicle body frame, at least a portion of the air cleaner connected to the engine is disposed, the A fuel tank is disposed above the air cleaner and is disposed behind the fuel tank so that a vehicle driver can sit on the fuel tank. A hollow space is formed so as to be positioned behind the air cleaner and the radiator, and the cleaner case of the air cleaner is disposed on the front side of the radiator to guide the traveling wind from the front to the front surface of the radiator. As described above, the air guide plate extending toward the radiator is integrally provided continuously.

According to a second aspect of the present invention, there is provided a motorcycle in which at least a part of an air cleaner connected to the engine is disposed above a radiator disposed in front of an engine mounted on a vehicle body frame. A front portion of the case projects above the radiator and forward of the radiator, and the cleaner case is disposed on the front side of the radiator to guide the traveling wind from the front to the front surface of the radiator. A wind guide plate is integrally provided continuously, and the wind guide plate extends from the lower portion of the front end of the cleaner case so as to incline downward toward the radiator .

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the present invention, the cleaner case is provided with a bulging portion disposed between the radiator and the engine.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect of the present invention, the front surface of the bulging portion is formed as an inclined surface inclined rearwardly downward.

In addition to the configuration of the invention described in claim 1 , the engine according to claim 5 is provided with a crankcase, a cylinder block and a cylinder head rising upward from the crankcase, The above-mentioned leg under space is arranged above.

Further claims 6 the described invention, in addition to the configuration of the invention according to any one of claims 1 to 5, before Symbol radiator In the rear side of the front wheel, and a part of the radiator is the axle of the front wheels It is located at the same height.

According to each of the first to sixth aspects of the present invention, in the motorcycle in which at least a part of the air cleaner is disposed above the radiator, the cleaner case of the air cleaner is disposed on the front side of the radiator and travels from the front. Since the wind guide plate extending to the radiator side is integrally connected so as to guide the wind to the front surface of the radiator, the wind guide plate can effectively guide the traveling wind to the radiator side to cool the radiator. In addition, the number of parts can be reduced by providing the air guide plate integrally with the cleaner case of the air cleaner.

According to the invention of claim 1, in the scooter type motorcycle having the underhole space, the bulky member is not disposed behind the radiator while ensuring the capacity of the fuel tank and the air cleaner. The wind guide effect of the wind guide plate can be further extracted.

According to the third aspect of the present invention, it is possible to effectively utilize the space between the radiator and the engine to increase the capacity of the air cleaner.

According to the fourth aspect of the present invention, while increasing the capacity of the air cleaner, cooling air is guided to the radiator side cooling air ducts can be efficiently flowed to the rearward side.

  Furthermore, according to the fifth aspect of the present invention, it is possible to lower the center of gravity of the engine while efficiently cooling the cylinder block and the cylinder head, and it is possible to secure a leg space.

  1 to 7 show a first embodiment of the present invention. FIG. 1 is a side view of a scooter type motorcycle. FIG. 2 is a longitudinal side view showing an enlarged front portion of the scooter type motorcycle. 3 is a front view of the engine, FIG. 4 is an enlarged cross-sectional view taken along line 4-4 in FIG. 1, FIG. 5 is a view taken in the direction of arrow 5 in FIG. 7 is a cross-sectional view taken along line 7-7 of FIG.

  First, in FIG. 1, a body frame F of the scooter type motorcycle includes a front fork 15 that pivotally supports a front wheel WF and a head pipe 17 that supports a steering handle 16 connected to the front fork 15 so as to be steerable. A pair of left and right down pipes 18 extending rearward and downward from the head pipe 17 and the head pipe 17 are provided below the down pipes 18 and the rear pipes are inclined more steeply than the down pipes 18. A pair of left and right lower pipes 19 that extend, and a pair of left and right main pipes 20 that are connected to the lower ends of the lower pipes 19 and extend rearward, and the rear ends of the down pipes 18 are connected to an intermediate portion. Is provided.

  Engine hanger brackets 19a extending in the extending direction of the lower pipes 19 are joined to lower ends of the lower pipes 19. The main pipes 20 are extended rearward from the vicinity of the joints of the lower pipes 19 and the engine hanger brackets 19a. In this embodiment, the engine hanger brackets 19a are connected to the lower pipes 19 of the main pipes 20 ... The function as a connecting member to the lower end is achieved. Further, reinforcing connecting plates 21 are provided between intermediate portions of the down pipes 18 and the lower pipes 19 that are paired on the left and right.

  Referring also to FIG. 2, the main pipe 20 is bent so as to swell upward, for example, a front half inclined part 20 a extending rearwardly from the lower end of the lower pipe 19, and a rear half inclined part 20 b extending rearwardly downward. A bent portion 20c connecting the rear end of the front half inclined portion 20a and the front end of the rear half inclined portion 20b is integrally formed, and as shown in FIG. 3 described later, the vertical direction is made longer than the horizontal direction. It consists of a square tube with a substantially right-angled quadrilateral. Moreover, the lower end of the down pipe 18 is connected to the middle portion of the front half inclined portion 20a by welding.

  A connecting plate 22 is joined by welding to the front part of the rear half inclined part 20b, the front end of the seat rail 23 extending rearward is connected to the connecting plate 22, and the rear part of the pair of left and right seat rails 23 ... Are integrally connected to each other. Moreover, in this embodiment, a part of the front end side of the connecting plate 22 is arranged so as to cover the bent portion 20c, whereby the connecting plate 22 and the seat rail 23 are efficiently connected to the rear half inclined portion 20b of the main pipe 20. Can be joined to the front. Further, the rear ends of the rear pipes 24 that extend rearward with the front ends joined to the rear ends of the rear inclined portions 20b are joined to the rear portions of the seat rails 23 by welding, respectively. Further, reinforcing connecting plates 25 are provided between the middle portions of the seat rails 23 and the rear pipes 24 that are paired on the left and right.

  Referring also to FIG. 3, in the vehicle body frame F, a power unit PA including an engine EA that is four cycles and a continuously variable transmission M that changes the output of the engine EA is to drive the rear wheels WR. Installed. The engine EA is configured, for example, as a water-cooled single cylinder, and is coupled to a crankcase 28, a cylinder block 29 having a cylinder axis extending vertically and rising from the crankcase 28, and an upper end of the cylinder block 29. And a head cover 31 coupled to the top of the cylinder head 30.

  By the way, first engine hangers 32 are provided on the front half inclined portions 20a of the main pipes 20 in the vicinity of the lower ends of the down pipes 18 in the vehicle body frame F, and the front of the cylinder block 29 in the engine EA. The upper portion of the crankcase 28 is supported by the first engine hangers 32, and the cylinder block 29 and the cylinder head 30 are disposed between the bent portions 20c of the main pipes 20. Further, second engine hangers 33 are attached to the lower ends of the engine hanger brackets 19a connected to the lower ends of the lower pipes 19 with a pair of bolts 43, and the lower part on the front side of the crankcase 28 is a second engine hanger. 33... Are fastened and supported by bolts 44.

  In this way, the engine EA can be supported by the main pipes 20 at a portion having high rigidity, and the first engine hanger 32 has a pair of the extension lines of the center line of the down pipe 18 from both sides. The crankcase 28 of the engine EA is provided on the extension line of the center line of the down pipes 18 by fastening the bolts 27. It is supported by the first engine hanger 32... The crankcase 28 can be supported by the first engine hanger 32.

  In FIG. 4, a crankshaft 34 rotatably supported by the crankcase 28 is integrally provided with a pair of crank webs 34a, 34a and a crank pin 34b connecting the crank webs 34a, 34a. A piston 35 slidably fitted into the cylinder block 29 is connected to a crank pin 34b between the two crank webs 34a, 34a via a connecting rod 36.

  One end of the crankshaft 34 protrudes from the crankcase 28 on the left side along the traveling direction of the motorcycle, and a rotor 37 fixed to one end of the crankshaft 34 and a stator accommodated in the rotor 37. The AC generator 39 is covered with a left cover 40 coupled to the crankcase 28, and the stator 38 is fixed to the left cover 40.

  The camshaft 41 is rotatably supported by the cylinder head 30 so as to constitute a part of a valve operating device that opens and closes an intake valve and an exhaust valve (not shown) disposed in the cylinder head 30. A timing transmission device 42 is provided between the crankcase 28 and the crankshaft 34 between the AC generator 39, and the rotational power of the crankshaft 34 is halved by the timing transmission device 42. And is transmitted to the camshaft 41.

  A case main body 45 extending rearward from the crankcase 28 is connected to the crankcase 28 on the right side along the traveling direction of the motorcycle. A right cover 46 fastened to the right side of the case main body 45 and the case A gear case 47 fastened to the rear right side of the main body 45 and the case main body 45 constitute a transmission case 48. A transmission chamber 49 is formed between the case main body 45 and the right cover 46, and the case main body 45 and the gear case 47 are formed. A gear chamber 50 is formed between them.

  The transmission chamber 49 of the transmission case 48 houses a belt-type continuously variable transmission M for continuously changing the rotational power of the crankshaft 34 and transmitting it to the rear wheel side. The continuously variable transmission M has a drive pulley 51 attached to the other end of the crankshaft 34 facing the transmission chamber 49, and an axis parallel to the crankshaft 34, and is rotatable to the rear of the transmission case 48. And a drive pulley 51 and an endless belt 53 that is wound around the driven pulley 52.

  The drive pulley 51 changes the winding radius of the belt 53 by a sliding operation of a slide cylinder 56 that slides in the axial direction of the crankshaft 34 by the operation of an electric motor (not shown). The driven pulley 52 changes the winding radius to the opposite side of the drive pulley 51 in accordance with the change in the winding radius of the belt 53 at the drive pulley 51. A centrifugal clutch 55 is interposed.

  The other end side of the transmission shaft 54 is disposed facing the gear chamber 50, and an output shaft 57 having an axis parallel to the transmission shaft 54 is rotatably supported by the case main body 45 and the gear case 47. Accommodates a reduction gear train 58 that reduces the rotational power of the transmission shaft 54 and transmits it to the output shaft 57. One end portion of the output shaft 57 passes through the rear portion of the gear case 47 and protrudes to the left side of the rear portion of the gear case 47.

  By the way, the axle 59 of the rear wheel WR is pivotally supported by the rear part of the swing arm 60, and between the rear part of the case main body 45 and the gear case 47 constituting a part of the transmission case 48 is provided at the front end of the swing arm 60. A pair of support arm portions 60a and 60b sandwiching each other are provided. Thus, one support arm portion 60a is supported on the output shaft 57 so as to be relatively rotatable, and the other support arm portion 60b is provided on the rear portion of the case main body 45 so as to be coaxial with the output shaft 57. The shaft 61 is rotatably supported. That is, the front end portion of the swing arm 60 is supported by the transmission case 48 so as to be swingable up and down.

  One end of the output shaft 57 protrudes from one support arm portion 60a of the swing arm 60, and the drive sprocket 62 is fixed to the protrusion portion of the output shaft 57 from the support arm portion 60a. On the other hand, a driven sprocket 63 is fixed to the axle 59 of the rear wheel WR on the left side along the traveling direction of the motorcycle, and an endless chain 64 is wound around the drive sprocket 62 and the driven sprocket 63. Moreover, a sprocket cover 65 that covers the drive sprocket 62 is attached to the outer surface of the front end of the support arm 60a.

  A pair of brackets 66 extending upward are provided at the rear portion of the transmission case 48, and these brackets 66 are supported by the rear end portion of the main pipe 20. Further, as clearly shown in FIG. 1, a pair of main stand shafts 67 are coaxially provided at the lower rear side of the transmission case 48, and the main stand 68 can be rotated by the main stand shafts 67. Is pivotally supported. Further, a cross pipe 71 is installed between the bent portions 20c of the main pipes 20, and between the cross pipe 71 and a cushion bracket 60c provided at the front portion of the swing arm 60, A rear cushion 72 having an axis extending in the front-rear direction is provided.

  Referring to FIG. 2, the downstream end of the throttle body 74 is connected to the front side surface of the cylinder head 30. Further, a fuel tank 90A is disposed so as to straddle both down pipes 18 in the vehicle body frame F, and an air cleaner 76A disposed in front of the engine EA and below the fuel tank 90A is disposed at the upstream end of the throttle body 74. The fuel injection valve 77 is attached to the throttle body 74.

  The air cleaner 76 </ b> A has a cleaner element 149 housed in a cleaner case 148. The cleaner case 148 includes a bowl-shaped first case member 150 opened to the rear side and a bowl-shaped second case member 151 opened to the front, in the cleaner case 148 in the front unpurified chamber 152 and the rear purification. The cleaner element 149 partitioned into the chamber 153 is joined so as to be sandwiched between the peripheral portions of the case members 150 and 151.

  The first case member 150 is provided with an outside air introduction pipe 154 leading to the unpurified chamber 152 so as to introduce outside air from the right side of the air cleaner 76A, for example, and the throttle body 74 via the second case member 151 is provided. An intake pipe 155 having the downstream end connected to the upstream end is accommodated in the purification chamber 153.

  Referring also to FIG. 5, a radiator 91 for cooling engine cooling water heated by the water-cooled engine EA is provided below the engine EA below the front portion of the first case member 150 in the air cleaner 76A. A radiator grill 174 is attached to the front surface of the radiator 91. At the lower part of the radiator 91, there are provided mounting arm portions 168 that project toward the engine hanger bracket 19a provided on the vehicle body frame F, and the mounting arm portions 168 are provided on the engine hanger bracket 19a. The brackets 169 are supported by mount rubbers 170. Further, the upper portion of the radiator 91 is provided with mounting arm portions 171... Projecting toward the upper lower pipe 19..., And the mounting arm portions 171 are mounted on the brackets 172. 173... That is, the radiator 91 is supported by the lower pipes 19 and the engine hanger brackets 19a of the vehicle body frame F.

  An air guide plate 156 is disposed below the first case member 150 constituting a part of the cleaner case 148 in the air cleaner 76A, and is disposed on the front side of the radiator 91 so as to guide the traveling wind from the front to the front surface of the radiator 91. The air guide plate 156 is provided so as to extend from the lower front end portion of the cleaner case 148 toward the radiator 91 so as to be inclined downward and to wrap around the upper portion of the radiator 91 from both sides. Plates 156a are integrally provided on both sides of the air guide plate 156.

  Further, a bulging portion 157 bulging downward is provided at a lower portion of the cleaner case 148 in the air cleaner 76A, and the bulging portion 157 is disposed between the radiator 91 and the engine EA. In addition, the front surface 157a of the bulging portion 157 is formed in an inclined surface that is inclined downward.

  The upstream end of the exhaust pipe 95 is connected to the rear side surface of the cylinder head 30 in the engine EA, and the downstream end of the exhaust pipe 95 is connected to an exhaust muffler 97 disposed on the right side of the rear wheel WR.

  Referring to FIG. 1, the head pipe 17 at the front end of the vehicle body frame F is provided with a lock mechanism 101 that can switch between the locked state and the unlocked state of the steering handle 16. A stay 111 extending obliquely upward in front of the head pipe 17 is fixed to the head pipe 17, and a meter 112 disposed in front of the center portion of the steering handle 16 is attached to the upper end of the stay 111. A supporting member 114 to be supported is attached to the upper portion of the stay 111. A key cylinder lock 102 is attached to the stay 111 in the vicinity of the meter 112, and the lock mechanism 101 is switched by operation of the key cylinder lock 102.

  The fuel tank 90A, the air cleaner 76A, the power unit PA, and the vehicle body frame F are covered with a vehicle body cover 125 made of synthetic resin. The vehicle body cover 125 covers the front part of the head pipe 17 and the upper part of the front wheel WF. In addition, a front cover 126 to which the headlamp 113 is attached, a center cover 127 that covers the head pipe 17 and the fuel tank 90A from the rear side and that is continuous with the front cover 126, and is joined to both the left and right sides of the front cover 126 to occupant legs. A pair of left and right leg shields 128 covering the front, a pair of left and right footrests 129 connected to the leg shield 128 to support the occupant's feet (see FIG. 3), and the upper part between the footrests 129. Floor tunnel that protrudes from the center cover 127 Part 130, skirt part 131 (see FIG. 3) hanging downward from the outer edges of both foot rest parts 129, and foot rest parts 129 covering the left and right sides of the rear part of body frame F, and a floor tunnel part And a rear cover 132 joined to 130.

  On the rear cover 132, a tandem riding seat 133 that allows a vehicle driver who steers the steering handle 16 to be seated and allows the passenger to rest behind the vehicle driver is provided so as to be openable and closable. . By the way, the riding seat 133 is disposed behind the fuel tank 90A, and a center cover 127 that covers the fuel tank 90A from the rear side of the vehicle body cover 125, and a floor that continues to the rear portion of the center cover 127. The tunnel portion 130 and the rear cover 132 on which the riding seat 133 is provided, the undercut space 135 having a substantially U shape in a side view, the fuel tank 90A and the air cleaner 76A on the front side, and the riding seat 133 on the rear side. The radiator 91, and both the down pipes 18 and the lower pipes 19 in the vehicle body frame F are also disposed in front of the leg space 135, and the cylinder head 30 in the engine EA. And a foothole space 135 above the head cover 31. It is location.

  6 and 7, a storage box 140 is disposed below the riding seat 133 so that the upper end opening of the riding seat 133 is closed so as to be openable and closable. Are supported by the seat rails 23 and the rear pipes 24.

  The storage box 140 is disposed above a rear cushion 72 provided between the cross pipe 71 and the swing arm 60 of the vehicle body frame F, and the rear cushion 72 is placed on the bottom wall 140a of the storage box 140. An accommodation recess 142 is provided for accommodating the axis so that the axis is located above the lower surface of the bottom wall 140a. Moreover, as clearly shown in FIG. 7, the storage recess 142 is disposed at the center in the width direction of the storage box 140, and the visor 144 is opened upward by such an arrangement of the storage recess 142. It is possible to store the jet-type helmet 143 in the stored state in the storage box 140.

  Next, the operation of the first embodiment will be described. For a ride on which a vehicle driver who operates a head pipe 17 at the front end of the body frame F and a steering handle 16 supported so as to be steerable by the head pipe 17 sits. A substantially U-shaped under bore space 135 disposed between the seat 133 and the seat 133 is formed by the vehicle body cover 125, and the vehicle body frame F extends from the head pipe 17 to the left and right in front of the under bore space 135. A pair of down pipes 18, a pair of left and right lower pipes 19 that are disposed below the down pipes 18 and that extend rearwardly downward from the head pipe 17, and both lower pipes 19 that extend rearward from the lower ends of the lower pipes 19. A pair of left and right main pipes 20 with the lower ends of the down pipes 18 connected to the middle portion. A first-half inclined portion 20a extending from the lower end of the lower pipe 19 to the rear and the lower end of the down-pipe 18 being connected to the middle portion, a second-half inclined portion 20b extending rearwardly downward, and bent so as to expand upward, the first-half inclined portion. A bent part 20c connecting the rear end of 20a and the front end of the rear half inclined part 20b is integrally formed.

  According to such a structure of the vehicle body frame F, the main pipe 20 is formed in a shape that extends rearwardly from the lower end of the lower pipe 19, and further bends upward after being bent upward. The degree of freedom of the shape of the engine EA can be increased, and the curved portion 20c in the middle of the main pipe 20 can be made appropriate, so that the maneuverability can be optimized. it can.

  Further, the first engine hanger 32 that supports the engine EA is provided in the front half inclined portion 20a of the main pipe 20 in the vicinity of the lower end of the down pipe 18 so that the rigidity is enhanced by the connection with the down pipe 18. The engine EA can be supported on the vehicle body frame F efficiently and reliably by supporting the engine EA on the main pipe 20.

  Further, the front ends of the pair of left and right seat rails 23 extending rearward so as to support the riding seat 133 are joined to the front portions of the rear half inclined portions 20b of the main pipes 20 respectively, thereby the main pipe. 20 and the seat rails 23 can be made appropriate, and the rigidity of joining the seat rails 23 to the main pipes 20 can be increased and balanced.

  In addition, since the main pipes 20 are made of rectangular tubes having a right-angled quadrilateral cross-sectional shape whose vertical direction is longer than the horizontal direction, the vertical rigidity of the main pipes 20 is high, and in the horizontal direction. By providing a bend, more comfortable maneuverability can be obtained.

  By the way, the front part of the swing arm 60 that pivotally supports the rear wheel WR at the rear part is supported by the transmission case 48 so as to be swingable up and down, and above the rear cushion 72 provided between the vehicle body frame F and the swing arm 60. The storage box 140 is disposed below the riding seat 133 on which the vehicle driver sits. The rear cushion 72 is disposed on the bottom surface of the bottom wall 140a of the storage box 140, and the central axis of the rear cushion 72 is the bottom surface of the bottom wall 140a. Since the storage recess 142 is provided so as to be positioned at a higher position than the rear cushion 72, the bottom wall 140a of the storage box 140 can be set at a lower position while providing a gap with the rear cushion 72. A large capacity of 140 can be secured.

  A radiator 91 is disposed in front of the engine EA, and an air cleaner 76A is disposed above the radiator 91. The air cleaner 76A extends toward the radiator 91 so as to guide traveling air from the front to the cleaner case 148 of the air cleaner 76A. Since the air guide plate 156 is integrally provided continuously, it is possible to cool the radiator 91 by effectively guiding the traveling wind to the radiator 91 side as indicated by the arrow in FIG. 2 while reducing the number of parts. .

  Further, since the bulging portion 157 disposed between the radiator 91 and the engine EA is provided in the cleaner case 148, the capacity of the air cleaner 76A can be increased by effectively utilizing the space between the radiator 91 and the engine EA. In addition, since the front surface 157a of the bulging portion 157 is formed in an inclined surface that is inclined downward, the cooling air guided to the radiator 91 side by the air guide plate 156 is efficiently rearward while increasing the capacity of the air cleaner 76A. Can be shed.

  In addition, since the undercut space 135 is disposed behind the fuel tank 90A, the air cleaner 76A, and the radiator 91, in the scooter type motorcycle, the volume of the fuel tank 90A and the air cleaner 76A is secured, and the volume behind the radiator 91 is increased. It is possible to draw out the wind guide effect of the wind guide plate 156 in such a manner that a member having a gap is not disposed.

  Further, the engine EA includes a crankcase 28, a cylinder block 29 and a cylinder head 30 standing upward from the crankcase 28, and the undercut space 135 is disposed above the cylinder head 30, so that the cylinder block 29 and the cylinder head 30 can be efficiently cooled, and the center of gravity of the engine EA can be lowered to secure the undercut space 135.

  Furthermore, since the key cylinder lock 102 is disposed in front of the steering handle 16 and in the vicinity of the meter 112, the operation of the key cylinder lock 102 by the vehicle driver can be facilitated.

  FIG. 8 is a side view of a scooter type motorcycle according to a second embodiment of the present invention, FIG. 9 is a longitudinal side view showing an enlarged front portion of the scooter type motorcycle, and FIG. 10 is a power unit in a state where the intake system is omitted. FIG. 11 is a view taken in the direction of arrow 11 in FIG. 10, FIG. 12 is a view taken in the direction of arrow 12 in FIG. 10, and FIG. 13 is a cross-sectional view taken along line 13-13 in FIG. Are denoted by the same reference numerals, and detailed description thereof is omitted.

  First, in FIG. 8 and FIG. 9, the vehicle body frame F of the scooter type motorcycle is configured in the same manner as in the first embodiment. The vehicle body frame F includes an engine EB having four cycles and the engine EB. A power unit PB comprising a continuously variable transmission M that shifts the output of the rear wheel WR is mounted to drive the rear wheel WR.

  Referring to FIGS. 10 to 12 as well, the engine EB is configured in, for example, a water-cooled two-cylinder V-type, and has a crankcase 28 and a cylinder axis slightly inclined forward. A front bank BF extending forward from the crankcase 28, and a rear bank BR extending upward from the crankcase 28 so as to form a V shape with the front bank BF. Each bank BF, BR The cylinder blocks 29F and 29R coupled to the crankcase 28, the cylinder heads 30F and 30R coupled to the cylinder blocks 29F and 29R on the opposite side of the crankcase 28, and the tops of the cylinder heads 30F and 30R. Head covers 31F and 31R are provided.

  The first engine hanger 32 provided in the front half inclined portion 20a of the main pipes 20 in the vicinity of the lower end of the down pipe 18 in the vehicle body frame F includes a portion between the front and rear banks BF and BR of the engine EB. The upper portion of the crankcase 28 is supported, and the rear bank BR is disposed between the bent portions 20c of the main pipes 20. Further, second engine hangers 33 are fastened to the engine hanger brackets 19a connected to the lower ends of the lower pipes 19 and the lower part of the crankcase 28 is supported by the second engine hangers 33 below the front bank BF. Is done.

  In FIG. 13, the pistons 35 of the banks BF, BR are connected to crank pins 34b between the crank webs 34a, 34b of the crankshaft 34 rotatably supported by the crankcase 28 via connecting rods 36. Commonly connected.

  Further, the two cylinder heads 30F are configured so as to constitute a part of a valve operating device that opens and closes intake valves and exhaust valves (not shown) disposed in the cylinder heads 30F, 30R of the banks BF, BR, respectively. , 30R, a camshaft 41 rotatably supported by the crankshaft 34 between the crankcase 28 and the AC generator 39 is provided between the camshaft 41 and the AC generator 39. Is transmitted to the camshafts 41... By the timing transmission device 42.

  A pair of brackets 66 provided at the rear portion of the transmission case 48 coupled to the crankcase 28 and extending upward are supported by the rear end portion of the main pipe 20. Further, a rear cushion 72 having an axial line extending in the front-rear direction is interposed between a cross pipe 71 installed between the bent portions 20c of the main pipes 20 and a cushion bracket 60c provided at the front portion of the swing arm 60. Provided.

  Referring to FIG. 9, the intake system 73 of the engine EB includes a throttle body 74F having a downstream end connected to one side surface of the cylinder heads 30F, 30R of the banks BF, BR between the front and rear banks BF, BR. , 74R, intake pipes 75F, 75R connected to the upstream ends of both throttle bodies 74F, 74R, and the intake pipes 75F, 75R are arranged above the front bank BF so that the intake pipes 75F, 75R are connected in common. Air cleaner 76B, and fuel injection valves 77F and 77R are attached to the throttle bodies 74F and 74R.

  The air cleaner 76 </ b> B is configured by storing a cleaner element 79 in a cleaner case 78. The cleaner case 78 has a bowl-shaped first case member 80 that opens upward, and a second case member 81 that integrally includes a partition wall 81 a that partitions the cleaner case 78 into an upper unpurified chamber 83 and a lower purified chamber 84. And a bowl-shaped third case member 82 that opens downward is joined so that the peripheral portion of the second case member 81 is sandwiched between the peripheral portions of the first and third case members 80 and 82. The cleaner element 79 is detachably attached to the flow hole 85 provided in the partition wall 81a from above, that is, from the unpurified chamber 83 side.

  The intake pipes 75F and 75R are connected to the cleaner case 78 so as to enter the purification chamber 84, and an intake hole 86 communicating with the non-purification chamber 83 is provided on the side of the third case member 82 in the cleaner case 78.

  The cleaner case 78 of the air cleaner 76B is formed with a length in the front-rear direction larger than the length in the vertical direction, and a fuel tank arranged so as to straddle both down pipes 18 above the air cleaner 76B. 90B is mounted and supported on the front portion of the vehicle body frame F, that is, on both down pipes 18.

  Further, the ceiling wall of the cleaner case 78, that is, the ceiling wall 82a of the third case member 82 is formed to extend substantially horizontally in the front-rear direction so as to face the bottom wall 90Ba of the fuel tank 90B, and the partition wall of the second case member 81 81a is also formed to extend substantially horizontally in the front-rear direction.

  A radiator 91 for cooling the engine coolant heated by the water-cooled engine EB is disposed in front of the front bank BF in the engine EB and below the air cleaner 76B. The radiator 91 is disposed on the vehicle body frame F. Are supported by the lower pipe 19. Thus, the radiator 91, the fuel tank 90 </ b> B, and the air cleaner 76 </ b> B are disposed in front of the leg space 135 formed by the vehicle body cover 125.

  In addition, an air guide plate 92 that is disposed in front of the radiator 91 and guides the traveling wind from the front to the front surface of the radiator 91 is integrally provided in the lower portion of the cleaner case 78 in the air cleaner 76B, that is, the first case member 80. The air guide plate 92 extends from the lower front end portion of the cleaner case 78 so as to incline rearwardly downward toward the radiator 91 side, and has a side plate 92a that wraps around to cover the upper portion of the radiator 91 from both sides. The air guide plate 92 is integrally provided on both sides.

  As clearly shown in FIG. 9, an element replacement window 136 for replacing the cleaner element 79 housed in the cleaner case 78 is provided at the rear of the third case member 82 in the cleaner case 78 of the air cleaner 76B. The element replacement window 136 is provided facing the under space 135 and is closed by a lid member 137 that can be opened and closed.

  Further, the ceiling wall 82a of the cleaner case 78 is formed so as to extend substantially horizontally in the front-rear direction so as to face the bottom wall 90Ba of the fuel tank 90B, and the cleaner element 79 is also substantially horizontal from the element replacement window 136. It can be pulled out and is arranged in the cleaner case 78 in a substantially horizontal posture facing the ceiling wall 82a. Corresponding to the element replacement window 136, the floor tunnel portion 130 is provided with an opening that allows the lid member 137 to be opened and closed and the cleaner element 79 to be inserted and removed.

  The exhaust system 93 of the engine EB has an exhaust pipe 94 that is connected to the lower side surface of the cylinder head 30F in the front bank BF and extends rearward below the power unit PB, and the rear side surface of the cylinder head 30R in the rear bank BR. An exhaust pipe 95 to which the upstream end is connected, a collective exhaust pipe 96 that is connected in common to the downstream ends of the exhaust pipes 94 and 95, and a collective exhaust pipe 96 that is arranged on the right side of the rear wheel WR. The exhaust muffler 97 is provided.

  The exhaust pipe 94 of the front bank BF is bent in a substantially C shape downward from the cylinder head 30F, extends rearward through the lower side of the power unit PB, and rises toward the right side of the rear wheel WR behind the power unit PB. An accommodation recess 98 for accommodating at least the upper part of the exhaust pipe 94 is provided on the lower surface of the bottom wall 48a of the transmission case 48 constituting a part of the case of the power unit PB.

  Moreover, as shown in FIG. 13, the housing recess 98 is disposed between the crank pulley 34a on the drive pulley 51 side of the crankshaft 34 and the drive pulley 51, and thereby has a relatively large diameter. By avoiding interference with the drive pulley 51, the housing recess 98 can be formed without difficulty on the outer surface of the bottom wall 48a of the transmission case 48.

  Further, the exhaust pipe 95 of the rear bank BR is located behind the main stand shaft 67 and is arranged in parallel with the exhaust pipe 94 of the front bank BF so as to dive from the left side of the crankcase 28 to the rear part of the transmission case 48. It is formed by bending. That is, the exhaust pipe 95 of the rear bank BR extends from the cylinder head 30R to the left side of the crankcase 28 and the transmission case 48, and further penetrates the rear part of the transmission case 48 and behind the main stand shaft 67 to the front bank BF. The exhaust pipe 94 is formed in parallel.

  The collective exhaust pipe 96 is connected in common to the downstream ends of both exhaust pipes 94 and 95 arranged in parallel on the rear side of the power unit PB, and the upstream end of the exhaust muffler 97 is connected to the downstream end of the collective exhaust pipe 96. .

  A storage box 140 whose upper end opening is closed by a bottom plate 141 of the passenger seat 133 so as to be openable and closable is disposed below the passenger seat 133. A rear cushion 72 is provided on the bottom wall 140a of the storage box 140. A storage recess 142 is provided for storing the axis so that its axis is located above the bottom surface of the bottom wall 140a.

  According to the second embodiment, as in the first embodiment, the space below the main pipe 20 can be made relatively large, the degree of freedom of the shape of the engine EB can be increased, and the middle of the main pipe 20 can be increased. It is also possible to optimize the curved portion 20c of the engine so that the maneuverability can be optimized, and the engine EB is connected to the main pipe 20 at a portion where the rigidity is increased by the connection with the down pipe 18. Thus, the engine EB can be efficiently and reliably supported on the vehicle body frame F.

  Further, the bottom wall 140a of the storage box 140 can be set at a lower position while providing a gap between the rear cushion 72 and the storage box 140 can have a large capacity.

  Further, since the air guide plate 92 that is disposed in front of the engine EB and extends toward the radiator 91 is integrally connected to the cleaner case 78 of the air cleaner 76B, the number of parts can be reduced and the radiator 91 side of FIG. The radiator 91 can be cooled by effectively guiding the traveling wind as shown by the arrows.

  Further, the engine EB includes a crankcase 28 and a cylinder block 29R and a cylinder head 30R of a rear bank BR standing upward from the crankcase 28, and a leg hole space 135 is disposed above the cylinder head 30R. In addition, the cylinder block 29R and the cylinder head 30R can be efficiently cooled, and the center of gravity of the engine EB can be lowered to secure the undercut space 135.

  In addition, since the undercut space 135 is disposed behind the fuel tank 90B, the air cleaner 76B, and the radiator 91, in the scooter type motorcycle, the volume of the fuel tank 90B and the air cleaner 76B is secured, and the volume behind the radiator 91 is increased. It is possible to draw out the wind guide effect of the wind guide plate 92 in such a manner that a member having a gap is not disposed.

  Further, the front bank BF of the V-type engine EB mounted on the vehicle body frame F has a cylinder block 29F and a cylinder head 30F with the cylinder axis inclined forward, and on the right side of the crankcase 28 of the engine EB, A transmission case 48 that houses the continuously variable transmission M that constitutes the power unit PB together with the engine EB is coupled, and an exhaust pipe 94 whose upstream end is connected to the cylinder head 30F of the forwardly inclined cylinder axis passes below the power unit PB. However, an accommodation recess 98 for accommodating at least the upper part of the exhaust pipe 94 is provided on the lower surface of the bottom wall 48 a of the transmission case 48.

  Therefore, it is possible to arrange the exhaust pipe 94 so as to be closer to the power unit PB, thereby ensuring a minimum ground clearance and disposing the engine EB at a lower position, and a scooter type which is a low floor type vehicle. The center of gravity of a motorcycle can be lowered.

  Also, an exhaust pipe 95 connected to the rear side surface of the cylinder head 30R provided in the rear bank BR of the engine EB is disposed at a position corresponding to the rear portion of the power unit PB so as to pivotally support the main stand 68. The rear part of the transmission case 48 is dived from the left side of the crankcase 28 so as to be parallel to the exhaust pipe 94 that is connected to the cylinder head 30F of the front bank BF and passes below the power unit PB, behind the shaft 67. It is formed by bending. According to this, the space for arranging the exhaust pipe 95 to be secured behind the rear bank BR can be secured, and the space behind the rear bank BR can be effectively used for other purposes. Further, since the exhaust pipe 95 can be passed above the lowest part of the engine EB, it is easy to ensure the lowest ground clearance, and the center of gravity of the scooter type motorcycle can be lowered.

  A V-type engine EB is mounted on the vehicle body frame F so as to be supported by the first engine hanger 32... Between the front and rear banks BF, BR, and the rear bank BR is connected to both main pipes 20. Are arranged between the bent portions 20c of the V-type engine so that the front portion of the V-type engine EB and the rear banks BF and BR are supported by a relatively high portion of the main pipe 20 ... The engine EB can be efficiently mounted on the vehicle body frame F.

  An air cleaner 76B constituting a part of the intake system 73 connected to the engine EB mounted on the vehicle body frame F is disposed below the fuel tank 90B, and is housed in the cleaner case 78 of the air cleaner 76B. Since the element replacement window 136 for replacing the cleaner element 79 is provided facing the undercut space 135, when the cleaner element 79 of the air cleaner 76B is replaced, the cleaner element is opened with the element replacement window 136 opened. 79 can be easily exchanged from the side of the foothole space 135.

  Further, the ceiling wall 82a of the cleaner case 78 is formed so as to extend substantially horizontally in the front-rear direction so as to face the bottom wall 90Ba of the fuel tank 90B, and the cleaner element 79 can be pulled out almost horizontally from the element replacement window 136. Since the fuel tank 90B and the air cleaner 76B can be efficiently disposed while sufficiently securing their respective capacities, the fuel tank 90B and the air cleaner 76B are disposed in the cleaner case 78 in a substantially horizontal posture facing the ceiling wall 82a.

  In addition, since the cleaner case 78 of the air cleaner 76B is formed with a length in the front-rear direction larger than the length in the vertical direction, the capacity of the air cleaner 76B can be sufficiently secured and efficiently arranged.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. It is.

1 is a side view of a scooter type motorcycle according to a first embodiment. FIG. 2 is a longitudinal side view showing an enlarged front portion of the scooter type motorcycle. It is a front view of an engine. FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. FIG. 5 is a view taken in the direction of arrow 5 in FIG. 1. 1 is an enlarged side view of a rear part of a scooter type motorcycle. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6. It is a side view of the scooter type motorcycle of the second embodiment. FIG. 2 is a longitudinal side view showing an enlarged front portion of the scooter type motorcycle. It is a top view of a power unit in the state where an intake system was omitted. It is 11 arrow line view of FIG. It is a 12 arrow view of FIG. FIG. 13 is a cross-sectional view taken along line 13-13 in FIG. 8.

28 ... Crankcase 29, 29R ... Cylinder block 30, 30R ... Cylinder head 76A, 76B ... Air cleaner 78, 148 ... Cleaner case 90A, 90B ... Fuel tank 91 ... Radiator 92, 156 ... Wind guide plate 133 ... Riding seat 135 ... Foot hole space 157 ... Swelling portion 157a ... Front surface EA, EB ... Engine F ... Body frame WF ... Front wheel

Claims (6)

At least a part of an air cleaner (76A, 76B) connected to the engine (EA, EB) above a radiator (91) disposed in front of the engine (EA, EB) mounted on the vehicle body frame (F). And a fuel tank (90A, 90B) is disposed above the air cleaner (76A, 76B), and is disposed behind the fuel tank (90A, 90B) so that a vehicle driver can sit there. Between the seat (133) and the fuel tank (90A, 90B), there is a leg under space (135) that is substantially U-shaped in a side view than the air cleaner (76A, 76B) and the radiator (91). is formed so as to be positioned rearward, the air cleaner (76A, 76B) to the cleaner case (148,78), said radiator (91 An air guide plate (156, 92) arranged on the front side and extending toward the radiator (91) side is integrally connected so as to guide the traveling wind from the front to the front surface of the radiator (91). Motorcycle. At least a part of an air cleaner (76A, 76B) connected to the engine (EA, EB) above a radiator (91) disposed in front of the engine (EA, EB) mounted on the vehicle body frame (F). In a motorcycle in which
The front portion of the cleaner case (148, 78) of the air cleaner (76A, 76B) protrudes above the radiator (91) and in front of the radiator (91), and the cleaner case (148, 78). ), Wind guide plates (156, 92) that are disposed in front of the radiator (91) and guide the traveling wind from the front to the front surface of the radiator (91) are integrally provided,
The motorcycle according to claim 1, wherein the air guide plate (156, 92) extends from the lower part of the front end of the cleaner case (148, 78) to the radiator (91) so as to incline backward.   The motorcycle according to claim 1 or 2, wherein the cleaner case (148) is provided with a bulging portion (157) disposed between the radiator (91) and the engine (EA).   The motorcycle according to claim 3, wherein a front surface (157a) of the bulging portion (157) is formed as an inclined surface inclined downwardly and rearwardly. The engine (EA, EB) includes a crankcase (28), a cylinder block (29, 29R) and a cylinder head (30, 30R) standing upward from the crankcase (28). above the foot wicket space (135) according to claim 1 mOTORCYCLE of, wherein the is located in 30, 30r). The radiator (91) is located on the rear side of a front wheel (WF), and a part of the radiator (91) is located at the same height as an axle of the front wheel (WF). The motorcycle according to any one of 1 to 5 .

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