JP3759445B2 - Scooter type motorcycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body cover in which an engine having a cylinder portion whose cylinder axis is tilted forward is formed with a pair of left and right footrest portions and a floor tunnel portion raised upward between the footrest portions. The present invention relates to a covered scooter type motorcycle.
[0002]
[Prior art]
Conventionally, such a scooter type motorcycle is already known, for example, in Japanese Patent Application Laid-Open No. 2001-88763.
[0003]
[Problems to be solved by the invention]
By the way, in order to increase the engine displacement and increase the output, it is necessary to set the volume of the air cleaner sufficiently large. However, in the above-described conventional one, the pair of cylinders provided in the V-type engine is directed forward to the V-type. The air cleaner is disposed between the upper cylinder portion of the two cylinder portions and the head pipe at the front end of the body frame. For this reason, the air cleaner is surrounded on all sides, and it is difficult to secure a sufficient volume of the air cleaner, and there is a limit to increasing the engine displacement and output. In addition, since the air cleaner is disposed at a position where the traveling wind entering the vehicle body cover from above the front fender is blocked, the cooling performance of the engine is inevitably lowered.
[0004]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a scooter type motorcycle that can improve the cooling performance of the engine while sufficiently securing the volume of the air cleaner.
[0005]
[Means for Solving the Problems]
  In order to achieve the above object, according to a first aspect of the present invention, there is provided an engine having a cylinder portion whose cylinder axis is inclined forwardly upward, and a pair of left and right footrest portions and a raised portion between the footrest portions. In a scooter type motorcycle covered with a vehicle body cover where a floor tunnel portion is formed, above a cylinder head coupled to the cylinder portionThen, at least a part of the air cleaner is disposed in the floor tunnel portion over which the occupant straddles, and a part of the upper surface of the cleaner case of the air cleaner is exposed to the outside through the opening of the vehicle body cover, and the floor tunnel portion Part of the top surface ofIt is characterized by that.
[0006]
  According to such a configuration, above the cylinder head coupled to the cylinder portion having the cylinder axis inclined upward.Then, in the floor tunnel section where the occupants straddle,Air cleanerAt least part ofA cleaner case of the air cleanerA part of the upper surface of the vehicle body is exposed to the outside through the opening of the vehicle body cover and constitutes a part of the upper surface of the floor tunnel part.Therefore, it is possible to sufficiently secure the volume of the air cleaner and to increase the engine displacement and increase the output while maintaining the straddle property that is an advantage of the scooter type motorcycle. Moreover, since the air cleaner does not block the front of the engine, the cooling performance of the engine by the traveling wind can be improved, and the maintainability of the engine around the cylinder head can also be improved.
[0007]
According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, a radiator is disposed in front of the cylinder portion. According to the configuration, the air cleaner and the radiator are connected to the engine. Can be efficiently arranged along the space between the front wheel and the floor tunnel.
[0008]
According to a third aspect of the present invention, in addition to the configuration of the first or second aspect of the invention, the cleaner case includes a case front portion extending vertically and a case rear portion extending rearward from a lower portion of the case front portion. And having a substantially L-shape when viewed from the side, and according to such a configuration, the rear space of the head pipe at the front end of the vehicle body frame can be secured widely as an unpurified chamber side space in the air cleaner. This can contribute to reduction of intake noise and improvement of engine output.
[0009]
  Furthermore, in the invention according to claim 4, in addition to the configuration of the invention according to any one of claims 1 to 3, the air cleaner has an intake port opened behind a head pipe provided at the front end of the vehicle body frame. According to this configuration, inhalation of dust into the air cleaner can be avoided as much as possible.
  Further, the invention according to claim 5 is a V-type engine having the second cylinder part on the rear side of the cylinder part in addition to the configuration of the invention according to any one of claims 1 to 4. It is characterized by being.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.
[0011]
1 to 12 show a first embodiment of the present invention, FIG. 1 is a side view of a scooter type motorcycle, and FIG. 2 is a longitudinal section of a scooter type motorcycle with a part of a vehicle body cover omitted. 3 is an enlarged longitudinal sectional side view of the main part of FIG. 1, FIG. 4 is an enlarged sectional view of the engine along line 4-4 in FIG. 3, FIG. 5 is a sectional view taken along line 5-5 in FIG. 3 is a sectional view taken along line 6-6 in FIG. 3, FIG. 7 is an overall side view of the engine, intake device and exhaust device, FIG. 8 is a schematic plan view of the transmission system between the engine and rear wheels, intake device and exhaust device, and FIG. 2 is an enlarged cross-sectional view taken along line 9-9 in FIG. 2, FIG. 10 is a view taken in the direction of arrow 10 in FIG. 4, FIG. 11 is a partially cutaway plan view of a scooter type motorcycle, and FIG.
[0012]
1 to 3, a vehicle body frame F of this scooter type motorcycle includes a head pipe that supports a front fork 15 that pivotally supports a front wheel WF and a steering handle 16 that is coupled to the front fork 15 so as to be steerable. 17 and a pair of left and right down frame portions 18 extending rearward and downward from the head pipe 17, and a pair of left and right extension frame portions 19 extending rearward from upper ends of both down frame portions 18. A pair of left and right support frames 20 that extend forward and downward from the rear end of the frame portion 19 and a pair of left and right slopes that are connected to the rear end of the extension frame portion 19 and extend upward and are connected to each other. And a frame 21.
[0013]
The down frame portion 18 includes an upper down frame 22 extending downward from the head pipe 17, a lower down frame 23 extending downward from the head pipe 17 below the upper down frame 22, and upper and lower down frames 22, 23. The down frame portion 18 is connected to the head pipe 17 so as to extend straight in a side view.
[0014]
The extension frame portion 19 includes a horizontal frame 25 integrally connected to the rear end of the upper down frame 22 and extending substantially horizontally rearward, and an inclined frame 26 integrally connected to the rear end of the horizontal frame 25 and extending rearwardly upward. Prepare.
[0015]
The rear end of the inclined frame 26 in the extension frame portion 19 is coupled so that the front end of the inclined frame 21 is connected in a straight line, and the rear frame 27 is configured by both the inclined frames 26 and 21.
[0016]
4 to 8, the engine E includes a crankcase 29 that rotatably supports a crankshaft 28 having an axis extending in the left-right direction, and a first cylinder axis that extends upward from the crankcase 29. A first cylinder part 30A coupled to the crankcase 29 having C1, and a second cylinder part 30B coupled to the crankcase 29 having a second cylinder axis C2 extending rearwardly upward from the crankcase 29; The first cylinder head 31A coupled to the first cylinder portion 30A, the second cylinder head 31B coupled to the second cylinder portion 30B, and the first cylinder head 31A on the opposite side of the first cylinder portion 30A The second head coupled to the second cylinder head 31B on the opposite side of the first head cover 32A and the second cylinder portion 30B. A Ddokaba 32B, first and second cylinder portions 30A, 30B and configured to upwardly disposed the V-type, for example 2-cylinder back and forth.
[0017]
The down frame portion 18 of the body frame F is formed to extend straight between the first cylinder portion 30A on the front side of the cylinder portions 30A and 30B and the head pipe 17 in a side view. It is arrange | positioned at the both sides of 30 A of 1st cylinder parts which are sides.
[0018]
The extension frame portion 19 extending rearward from the down frame portion 18 extends rearward from the upper side of the first cylinder portion 30A through both sides of the second cylinder portion 30B which is the rear side.
[0019]
The upper part of the crankcase 29 is fastened and supported at the rear end of the upper down frame 22 of the down frame part 18 via bolts 33, and the crankcase 29 is attached to the rear end of the lower down frame 23 of the down frame part 18. The front part is fastened and supported via a bolt 34.
[0020]
By the way, the crankcase 29 is integrally provided with an extension case portion 29a extending rearward on the right side along the traveling direction of the motorcycle, and the right case 35 fastened to the extension case portion 29a and the extension case portion 29a change speed. A machine case 36 is constructed. The transmission case 36 is fastened and supported via bolts 37 to the front ends of the inclined frames 26 in the extension frame 19 of the vehicle body frame F, and fastened to the lower ends of the support frames 20 via bolts 38. Supported.
[0021]
Housed in the transmission case 36 is a belt type continuously variable transmission 39 for continuously changing the rotational power of the crankshaft 28 and transmitting it to the rear wheel WR side. The continuously variable transmission 39 has a transmission side transmission pulley 40 as a rotating means mounted on one end portion of the crankshaft 28 facing the transmission case 36, and an axis parallel to the crankshaft 28. 36, a transmission-side transmission pulley 42 mounted on one end of the transmission shaft 41 that is rotatably supported at the rear of the transmission 36, and an endless shape wound around the drive-side and driven-side transmission pulleys 40, 42. Belt 43.
[0022]
The drive-side transmission pulley 40 is fixed to the crankshaft 28 and is slidably supported on the crankshaft 28 so as to be close to and disengageable from the fixed pulley half 44. And a centrifugal mechanism 46 that exerts a force that presses the movable pulley half 45 toward the fixed pulley half 44 as the rotational speed of the crankshaft 28 increases. Composed. Thus, the fixed pulley half 44 is arranged closer to the crankcase 29 than the movable pulley half 45, that is, closer to the second cylinder portion 30B, and the centrifugal mechanism 46 is opposite to the fixed pulley half 44 with respect to the movable pulley half 45. Are provided between the ramp plate 47 fixed to the crankshaft 28 and the movable pulley half 45.
[0023]
The driven-side transmission pulley 43 slides on the transmission shaft 41 so that the fixed pulley half 48 is supported on the transmission shaft 41 so as to be relatively rotatable with the axial position being constant, and the fixed pulley half 48 can be moved close to and away from the transmission pulley 41. The movable pulley half 49 is supported so as to be capable of relative rotation and is urged by a spring toward the fixed pulley half 48, and the fixed pulley half 48 is cranked more than the movable pulley half 49. It arrange | positions at the case 29 side, ie, 2nd cylinder part 30B side.
[0024]
A centrifugal clutch 50 is provided between the movable pulley half 49 and the transmission shaft 41. When the rotational speed of the movable pulley half 49 exceeds a predetermined value, the centrifugal clutch 50 is separated from the movable pulley half 49 and the transmission shaft 41. The transmission shafts 41 are connected.
[0025]
An output shaft 51 having one end facing the transmission case 46 is supported at the rear portion of the transmission case 46 so as to be rotatable around an axis parallel to the transmission shaft 41, and is connected to the other end of the transmission shaft 41. The output shaft 51 is connected through a gear train 52.
[0026]
The other end of the output shaft 51 protrudes from the extension case portion 29a of the transmission case 36 on the left side along the traveling direction of the motorcycle, and a drive sprocket 55 is formed on the protruding portion of the transmission case 36 of the output shaft 51. Fixed. On the other hand, a driven sprocket 56 is fixed to the axle 58 of the rear wheel WR on the left side along the traveling direction of the motorcycle, and an endless chain 57 is wound around the drive sprocket 55 and the driven sprocket 56. In addition, the drive sprocket 55, the driven sprocket 56 and the chain 57 are covered with a chain case 59.
[0027]
Thus, the power of the engine E that is continuously shifted by the continuously variable transmission 39 is transmitted to the axle 58 of the rear wheel WR via the drive sprocket 55, the chain 57, and the driven sprocket 56.
[0028]
The other end portion of the crankshaft 28 protrudes from the crankcase 29 on the left side along the traveling direction of the motorcycle, and a rotor 61 fixed to the other end portion of the crankshaft 28 is accommodated in the rotor 61. An AC generator 63 is configured with the stator 62. The AC generator 63 is covered with a left cover 64 coupled to the crankcase 29, and the stator 62 is fixed to the left cover 64.
[0029]
Incidentally, both ends of the axle 58 of the rear wheel WR are pivotally supported by rear ends of a pair of left and right swing arms 65, 65, and the front ends of these swing arms 65, 65 are connected to the transmission case 36. Slightly rearward, it is supported on the support frame 20 of the vehicle body frame F through a support shaft 66 parallel to the axle 58 so as to be swingable up and down. Moreover, as clearly shown in FIG. 9, the swing arm 65 disposed on the left side of the swing arms 65, 65 along the traveling direction of the motorcycle is housed in a chain case 59. The intermediate portions 65 and 65 are connected to each other by a connecting pipe 67 that penetrates the inner wall of the chain case 59.
[0030]
With particular attention to FIG. 9, stays 68, 68 rising upward from the rear frames 27 are fixed to the connecting portions of the inclined frames 26, 21,. . Both the stays 68, 68 are bent so that the distance between the stays 68, 68 increases as they go upward. The upper end portions are connected to each other by a cross member 69.
[0031]
The upper ends of the stays 68, 68 on both ends of the cross member 69 are connected to the upper ends of the rear cushion units 70, 70 disposed outside the stays 68, 68 and the swing arms 65, 65, Lower end portions of the rear cushion units 70 and 70 are connected to the outer surface side of the intermediate portion of the swing arms 65 and 65. That is, the rear cushion units 70, 70 are provided between the intermediate portions of the swing arms 65, 65 that pivotally support the rear wheel WR and the rear frames 27 of the vehicle body frame F.
[0032]
In FIG. 10, the engine E is a SOHC type engine, and is disposed between the first and second cylinder heads 31A and 31B and the first and second head covers 32A and 32B, respectively. Then, the valve operating devices 77 that open and close the intake valves 75 and the exhaust valves 76 that are spring-biased in the valve closing direction are accommodated.
[0033]
The valve operating device 77 includes a camshaft 78 that can rotate about an axis parallel to the crankshaft 28, an intake side that exhausts the intake valve 75 and the exhaust valve 76, and an exhaust valve that is driven by a cam included in the camshaft 78. Side rocker arms 79 and 80 are provided.
[0034]
The intake-side and exhaust-side rocker arms 79, 80 can be rotated around an axis parallel to the camshaft 78, and can swing on the eccentric shaft portions 81a, 82b of the rocker arm shafts 81, 82 supported by the head covers 32A, 32B. The tappet clearance can be adjusted by adjusting the pivot positions of the rocker arm shafts 81 and 82.
[0035]
Virtually arcuate arcs centering on the axis of the rocker arm shafts 81 and 82 are arranged so that substantially fan-shaped adjusting members 83 and 84 connected to one ends of the rocker arm shafts 81 and 82 are arranged along the outer surfaces of the cylinder heads 31A and 31B. The bolts 87 and 88 are inserted into the long holes 85 and 86 provided in the adjustment members 83 and 84, and the bolts 87 and 88 are screwed into the head covers 32A and 32B.
[0036]
That is, after the bolts 87 and 88 are loosened and the adjusting members 83 and 84 are rotated, the bolts 87 and 88 are tightened to fix the rotating positions of the adjusting members 83 and 84 and the rocker arm shafts 81 and 82. The tappet clearance of the valve 75 and the exhaust valve 76 can be adjusted.
[0037]
4 to 6, the rotational power of the crankshaft 28 is transmitted to the camshaft 77 at a reduction ratio of 1/2 between the camshaft 77 and the crankshaft 28 of the valve gear 77. A timing transmission mechanism 90 is provided. The timing transmission mechanism 90 includes a driving sprocket 91 fixed to the crankshaft 28, a driven sprocket 92 fixed to the camshaft 77, a driving and driven sprocket 91, And an endless cam chain 93 wound around 92.
[0038]
A portion from the crankcase 29 to the first head cover 32A via the first cylinder portion 30A and the first cylinder head 31A, and a portion from the crankcase 29 to the second head cover 32B via the second cylinder portion 30B and the second cylinder head 31B Are formed with cam chain chambers 94 for running the cam chains 93.
[0039]
By the way, the second cylinder axis C2 of the second cylinder part 30B is disposed on the opposite side of the belt-type continuously variable transmission 39 across the first cylinder axis C1 of the first cylinder part 30A, and the second cylinder part 30B. The side cam chain chamber 94 is disposed on the opposite side of the belt-type continuously variable transmission 39 with respect to the second cylinder axis C2, that is, on the left side in the traveling direction of the motorcycle, and the cam chain chamber 94 on the first cylinder portion 30A side. Is disposed between the first cylinder axis C1 and the belt-type continuously variable transmission 39.
[0040]
The cylinder heads 31A and 31B have spark plugs 95 and 95 attached thereto. These spark plugs 95 are opposite to the cam chain chamber 94 with respect to the cylinder axes C1 and C2 of the cylinder portions 30A and 30B. Placed in. Moreover, the adjusting members 83 and 84 for adjusting the tappet clearance in each valve operating device 77 are also arranged on the outer surfaces of the head covers 32A and 32B on the side opposite to the cam chain chamber 94.
[0041]
Referring also to FIG. 11, the vehicle body frame F including the engine E is covered with a vehicle body cover 98 made of synthetic resin. The vehicle body cover 98 covers the front portion of the head pipe 17 and the upper portion of the front wheel WF. A front cover 99 to be covered, a pair of left and right leg shields 100 which are joined to the left and right sides of the front cover 99 to cover the front of the occupant's legs, and a pair of left and right footrests connected to the leg shield 100 to support the occupant's feet , A floor tunnel portion 102 that protrudes upward between the footrest portions 101, a skirt portion 103 that hangs downward from the outer edges of the both footrest portions 101, and the rear portion of the vehicle body frame F And a rear cover 104 that is joined to the floor tunnel portion 102.
[0042]
On the rear cover 104, an occupant seat 105 on which a driver sits and an occupant seat 106 on which the passenger sits can be opened and closed, and the occupant seat 106 is disposed above the rear portion of the occupant seat 105. .
[0043]
By the way, the first and second cylinder portions 30A, 30B in the engine E are arranged in the front-rear and upward direction along the inner side surface of the floor tunnel portion 102 in the vehicle body cover 98, and are formed on both side surfaces of the floor tunnel portion 102. An opening 107 corresponding to the adjusting members 83 and 84 and the spark plug 95 on the first cylinder portion 30A side, and an opening 107 corresponding to the adjusting members 83 and 84 and the spark plug 95 on the second cylinder portion 30B side are provided. The opening portions 107 and 107 are closed by lid members 108 and 108 that are detachably attached to the floor tunnel portion 102.
[0044]
A partition wall 109 that covers the engine E from above is fixedly disposed in the vehicle body cover 98 so as to form a travel air passage 110 between the partition wall 109 and the vehicle body cover 98.
[0045]
As clearly shown in FIGS. 2 and 3, a traveling wind introduction port 111 is provided at a lower portion of the front cover 99 of the vehicle body cover 98, and the traveling air introduced into the vehicle body cover 98 from the traveling wind introduction port 111. A front cover wind guide plate 112 is provided at the bottom of the front cover 99 to guide the wind toward the traveling wind passage 110, and a bottom bridge wind guide plate is provided between the front cover wind guide plate 112 and the front end of the partition wall 109. 113 is provided.
[0046]
The bottom bridge air guide plate 113 is fixed on the bottom bridge 15a of the front fork 15 and is formed in a circular shape centering on the rotational axis of the front fork 15 as shown in FIG. In addition, a part of the outer peripheral edge of the bottom bridge air guide plate 113 is slidably superposed on the rear portion of the front cover air guide plate 112, and the rear portion of the bottom bridge air guide plate 113 is accommodated in the front portion of the partition wall 109. Has been. Therefore, regardless of the steering operation of the front fork 15 and the steering handle 16, the traveling wind introduced into the vehicle body cover 98 from the traveling wind inlet 111 passes through the front cover wind guide plate 112 and the bottom bridge wind guide plate 113. Thus, the air is surely guided to the traveling wind passage 110 side.
[0047]
As clearly shown in FIG. 7, the intake device 114 of the engine E has a downstream end on one side of the cylinder heads 31A and 31B on the side corresponding to the first and second cylinder heads 31A and 31B included in the engine E. Are connected to the upstream ends of the throttle bodies 115A and 115B, and the intake pipes 116A and 116B are connected in common. The air cleaner 117 is disposed above the cylinder head 31A, and the fuel injection valves 118A and 118B are attached to the cylinder heads 31A and 31B at the connecting portions of the throttle bodies 115A and 115B.
[0048]
The partition wall 109 penetrates through the intermediate portions of the intake pipes 116A and 116B to partition the intake device 114 vertically, and the through holes 119A and 119B for penetrating both the intake pipes 116A and 116B are provided as partition walls. 109 is provided at an intermediate portion. In addition, the intake pipes 116A and 116B are formed to bend so that the distances from the air cleaner 117 to the throttle bodies 115A and 115B are substantially equal to each other in a side view, and the through hole 119A extends forward of the intake pipe 116A. The through-hole 119B is provided in the partition wall 109 so as to penetrate the intake pipe 116B from the rear.
[0049]
The air cleaner 117 disposed at the front portion in the traveling air passage 110 extends in the front-rear direction along the floor tunnel portion 102 and is disposed in the cleaner case 121 that constitutes a part of the top portion of the floor tunnel portion 102. The cleaner element 122 is accommodated so as to be divided into a front unpurified chamber 123 and a rear purified chamber 124, and the intake pipes 116A and 116B are plunged into the purified chamber 124.
[0050]
The cleaner case 121 has a case front portion 121a extending vertically and a case rear portion 121b extending rearward from the lower portion of the case front portion 121a, and is configured in a substantially L shape in a side view. The element 122 is a portion corresponding to the connecting portion of the case front part 121a and the case rear part 121b and is housed and fixed in the cleaner case 121.
[0051]
A suction pipe 125 leading to the non-purification chamber 123 is connected to the upper end of the front portion of the cleaner case 121. The suction pipe 125 extends downward with its lower end opening as a suction port 126, and the suction port 126 is opened behind the head pipe 17 provided at the front end of the vehicle body frame F.
[0052]
The partition wall 109 covers the cylinder heads 31A and 31B and the head covers 32A and 32B of the engine E, and the openings 127 corresponding to the openings 107 provided in the floor tunnel portion 102 of the vehicle body cover 98, respectively. Are attached to the partition wall 109 so as to be able to open and close the openings 127.
[0053]
By the way, the partition wall 109 extends to the lower part of the occupant seat 105 provided at the rear part of the vehicle body cover 98, and is covered by the occupant seat 105 from above between the occupant seat 105 and the rear part of the partition wall 109. A fuel tank 130 is disposed.
[0054]
A storage box 131 is disposed behind the fuel tank 130 and below the occupant seats 105 and 106 so that the upper end opening of the occupant seats 105 and 106 can be opened and closed. Moreover, the left and right sides of the storage box 131 are placed on support portions 68a and 68a formed as flat surfaces on the upper ends of stays 68 and 68 to which the upper ends of the rear cushion units 70 and 70 are connected.
[0055]
That is, the support portions 68 a and 68 a formed on the upper portions of the stays 68 and 68 support the loads of the occupant seats 105 and 106 through the storage box 131.
[0056]
A concave portion 131a for accommodating the cross member 69 is provided in the front portion of the storage box 131 so as to be recessed rearward, and a bag hole-shaped battery storage portion 131b that can be opened in the storage box 131 below the concave portion 131a. A battery 132 provided between the rear frames 27 provided in the vehicle body frame F is accommodated in the battery accommodating portion 131b. In addition, the battery accommodating portion 131b is closed in an openable and closable manner by a lid member 133 constituting a part of the bottom wall of the storage box 131.
[0057]
A radiator 134 is disposed below the partition wall 109 and in front of the first cylinder portion 30A. The radiator 134 supports a radiator that is suspended from the lower down frame 23 of the down frame portion 18 of the vehicle body frame F. Supported by a frame 135.
[0058]
The exhaust device 136 of the engine E is connected to the other side surfaces of the first and second cylinder heads 31A and 31B. The exhaust pipe 137A connected to the other side surface of the first cylinder head 31A and the second cylinder An exhaust pipe 137B connected to the other side surface of the head 31B and an exhaust muffler 138 to which both the exhaust pipes 137A and 137B are connected in common are provided.
[0059]
An exhaust pipe 137A extending downward and connected to the other side surface of the first cylinder head 31A having a forwardly rising axis among the first and second cylinder heads 31A and 31B is located at a position higher than the axis of the crankshaft 28. Of the two footrests 101, 101 provided in the vehicle body cover 98 and extending rearward below the right footrest 101 in the traveling direction of the motorcycle. It passes the outside of the right cover 35 coupled to the case 29.
[0060]
The exhaust muffler 138 is disposed on the right side of the rear wheel WR, and the exhaust pipe 137A is connected to the exhaust muffler 138. The exhaust pipe 137B connected to the second cylinder head 31B is bent toward the exhaust muffler 138 through the rear lower part of the transmission case 36.
[0061]
By the way, an exhaust pipe cover 139 that covers the exhaust pipe 137A from the outside is fixed in the middle of the exhaust pipe 137A that connects the first cylinder head 31A and the exhaust muffler 138. It is connected to the skirt part 103 suspended from the outer edge of the footrest part 101 so as to appear to be connected integrally in appearance.
[0062]
Next, the operation of the first embodiment will be described. The vehicle body frame F includes a pair of left and right down frame portions 18 extending downward from the head pipe 17 that supports the front wheel WF so as to be steerable. 18 is attached with a V-type engine E having first and second cylinder portions 30A, 30B arranged in a V-shape in a side view. In addition, the engine E is covered with a vehicle body cover 98 in which a pair of left and right footrest portions 101, 101 and a floor tunnel portion 102 raised upward between the footrest portions 101, 101 are formed. The portions 30A and 30B are disposed in the front-rear and upward direction along the inner side surface of the floor tunnel portion 102, and the down frame portions 18 are disposed on both sides of the first cylinder portion 30A in the floor tunnel portion 102.
[0063]
Accordingly, the angle formed by the first and second cylinder portions 30A and 30B can be set wide, and both cylinder portions can be set even if the width of the engine E in the direction along the axis of the crankshaft 28 is set relatively small. 30A and 30B do not interfere with each other. Therefore, it is possible not only to improve the sports running performance by allowing the engine E to be arranged forward while relatively narrowing the front vehicle body width, By making it possible to set the width relatively narrow, it is possible to secure the width 101, 101 of the footrest portion and improve the riding comfort.
[0064]
Further, between the first cylinder portion 30A and the head pipe 17 disposed on the front side of both the cylinder portions 30A and 30B, the pair of left and right down frame portions 18... Does not widen the front vehicle body width or the footrest portion. While extending in a straight line in a side view while ensuring the width of 101, 101, the shape of the down frame portions 18 can be simplified to increase the rigidity, and the down frame portions 18 can be reduced in weight. be able to.
[0065]
The extension frame portions 19 that extend rearward from the upper side of the first cylinder portion 30A through both sides of the second cylinder portion 30B on the rear side are connected to the upper rear end of the down frame portion 18. By setting the angle formed by the first and second cylinder portions 30A, 30B to be wide as described above, the two cylinder portions 30A, 30B are spaced apart from each other, so that the extension frame portion 19 is bent, It is possible to avoid an increase in the number of welding points with other members, and it is possible to reduce the weight and increase the rigidity of the extension frame portion 19.
[0066]
Moreover, the crankcase 29 of the engine E is attached to the down frame portion 18 so that a part of the diamond-shaped vehicle body frame F constitutes the engine E, and both of the crankcase 29 are located at positions corresponding to the down frame portion 18. Only the first cylinder portion 30A in front of the cylinder portions 30A and 30B is positioned to facilitate the coupling of the down frame portion 18 to the crankcase 29, and a part of the vehicle body frame F is constituted by the engine E. Thus, the number of parts can be reduced, and the entire vehicle body can be further reduced in weight while securing a footrest space.
[0067]
Incidentally, a drive-side transmission pulley 40 of a belt-type continuously variable transmission 39 capable of continuously transmitting the rotational power of the crankshaft 28 to the rear wheels WR is mounted on one end of the crankshaft 28 of the engine E. The first and second cylinder portions 30A and 30B are respectively formed with cam chain chambers 94 for running cam chains 93 that transmit power to the camshaft 78 of the valve gear 77 corresponding to each of the cylinder portions 30A and 30B. However, the second cylinder axis C2 of the second cylinder part 30B is disposed on the opposite side of the belt type continuously variable transmission 39 across the first cylinder axis C1 of the first cylinder part 30A, and the second cylinder part A cam chain chamber 94 of 30B is disposed on the opposite side of the belt-type continuously variable transmission 39 with respect to the second cylinder axis C2.
[0068]
According to such an arrangement, the cam of the second cylinder portion 30B is disposed between the second cylinder axis C2 of the second cylinder portion 30B on the rear side and the belt-type continuously variable transmission 39 extending rearward from the engine E. Since the chain chamber 94 is not disposed, the second cylinder portion can be provided without increasing the width of the engine E even with a simple structure in which the drive-side transmission pulley 40 of the belt-type continuously variable transmission 39 is directly assembled to the crankshaft 28. The interval between 30B and the belt type continuously variable transmission 39 can be set relatively large as shown in FIG. 3, and the running wind can sufficiently flow between the second cylinder portion 30B and the belt type continuously variable transmission 39. Thus, the cooling efficiency of the belt-type continuously variable transmission 39 can be improved, and the durability of the continuously variable transmission 39 can be enhanced.
[0069]
Moreover, the drive-side transmission pulley 40 includes a fixed pulley half 44 fixed to the crankshaft 28, and a movable pulley half 45 supported slidably on the crankshaft 28 so as to be close to and away from the fixed pulley half 44. And the fixed pulley half 44 is disposed closer to the second cylinder portion 30B than the movable pulley half 45, so that the endless shape which is a component of the continuously variable transmission 39 is used during low-speed running where the running wind is weak. The belt 43 is positioned farther from the second cylinder portion 30B, which is advantageous for cooling the belt 43.
[0070]
The first and second cylinder heads 31A and 31B coupled to the first and second cylinder portions 30A and 30B are opposite to the cam chain chambers 84 with respect to the cylinder axes C1 and C2 of the cylinder portions 30A and 30B. Since the spark plugs 95 are respectively mounted on the side, the cam chain 93 is not obstructed during maintenance and inspection of the spark plugs 95, and the workability during maintenance and inspection of the spark plugs 95 is good. Become. Further, since the cam chain chamber 94 of the first cylinder portion 30A and the cam chain chamber 94 of the second cylinder portion 30B are disposed on both the left and right sides of the engine E, the first cylinder head 30A passes through the first cylinder head 31A. The right side wall of the engine E up to the head cover 32A and the left side wall of the engine E from the second cylinder part 30B through the second cylinder head 31B to the second head cover 32B are formed substantially flat. Can be mounted on the vehicle body side, and the motorcycle can be downsized.
[0071]
Moreover, as described above, the side walls of the cylinder portions 30A and 30B and the cylinder heads 31A and 31B opposite to the side where the spark plugs 95 and 95 are disposed are made substantially flat so that the floor tunnel portion 102 It is possible to make the width smaller, and on the side where the spark plugs 95, 95 are arranged, cooling air is blown between the inner surface of the floor tunnel portion 102 and the cylinder portions 30A, 30B and the cylinder heads 31A, 31B. Sufficient space can be secured for distribution.
[0072]
The cylinder portions 30A and 30B and the cylinder heads 31A and 31B of the engine E are arranged along the inner surface of the floor tunnel portion 102 provided in the vehicle body cover 98, and maintenance and ignition of the spark plugs 95 of both the cylinder heads 31A and 31B are performed. An opening 107 for inspection is provided on a side surface of the floor tunnel portion 102 so as to be opened and closed by a lid member 108. The partition wall 109 that covers the engine E and is fixedly disposed in the floor tunnel portion 102 is also provided with the above-described partition wall 109. Openings 127 corresponding to the openings 107 are provided to be openable and closable.
[0073]
Accordingly, the spark plugs 95 are located at positions corresponding to the side surfaces of the floor tunnel portion 102, and opening and opening the openings 107, 127, etc. facilitates maintenance / inspection of the spark plugs 95 and contaminates workers. This makes it possible to improve the workability when maintaining and inspecting the spark plugs 95. Moreover, since the side surface of the floor tunnel portion 102 does not require strength as compared with the footrest portions 101, 101, there is a problem in strength even when the floor tunnel portion 102 is provided with maintenance / inspection openings 107. There is nothing, and the strength of the footrest portions 101, 101 can be ensured.
[0074]
In addition, since the engine E is a SOHC type engine, the floor tunnel portion 102 can be reduced in size by preventing the cylinder heads 31A and 31B from increasing in size, thereby improving boarding / exiting performance.
[0075]
The valve gear 77 accommodated between the cylinder heads 31A, 31B and the head covers 32A, 32B is configured to be able to adjust the tappet clearance, and adjusting members 83, 84,... For adjusting the tappet clearance. Are arranged on the outer surfaces of the head covers 32A, 32B at positions corresponding to the openings 107 of the floor tunnel 102. Therefore, the tappet clearance in the valve gear 77 can be easily adjusted using the openings 107 and the openings 127 of the partition wall 109.
[0076]
The intake device 114 of the engine E is connected to one side surface of both cylinder heads 31A and 31B on the side corresponding to the two cylinder heads 31A and 31B, and the exhaust device 136 is connected to the other side surface of both cylinder heads 31A and 31B. Thus, the intake device 114 can be disposed in the floor tunnel portion 102, and the exhaust device 136 can be disposed in the space before and after the engine E without difficulty.
[0077]
Moreover, since the air cleaner 117 that constitutes a part of the intake device 114 is formed in a shape that extends back and forth along the floor tunnel portion 102, the intake pipe length and volume of the intake device 114 are sufficiently secured to improve the performance of the engine E. Can be improved.
[0078]
The air cleaner 117 is disposed above the first cylinder head 31A coupled to the first cylinder part 30A having the first cylinder axis C1 inclined forwardly upward, and constitutes a part of the floor tunnel part 102 so as to move forward and backward. It has a cleaner case 121 that extends, and can maintain a sufficient capacity of the air cleaner 117 while maintaining the straddle property that is an advantage of the scooter type motorcycle, and can increase the displacement of the engine E and increase the output. it can. In addition, since the air cleaner 117 does not block the front of the engine E, the cooling performance of the engine E by the traveling wind can be improved, and the maintainability of the engine E around the first cylinder head 31A is also improved. be able to.
[0079]
A radiator 134 is disposed in front of the first cylinder portion 30 </ b> A, and the air cleaner 117 and the radiator 134 can be efficiently disposed along the space between the engine E, the front wheel WF, and the floor tunnel portion 102.
[0080]
The cleaner case 121 includes a case front portion 121a extending vertically and a case rear portion 121b extending rearward from the lower portion of the case front portion 121a, and is configured in a substantially L shape in a side view. A space behind the head pipe 17 at the front end of the frame F can be secured widely as a space on the air cleaner 117 side of the unpurified chamber 123, which can contribute to reduction of intake noise and improvement of engine output.
[0081]
Further, since the suction port 126 of the air cleaner 117 is opened behind the head pipe 17, it is possible to avoid the suction of dust into the air cleaner 117 as much as possible.
[0082]
Incidentally, the heights of the left and right footrest portions 101, 101 are defined by the drive side transmission pulley 40 and the AC generator 63 attached to both ends of the crankshaft 28, but the front side first cylinder head 31A. The exhaust pipe 137 </ b> A extending downward from the other side surface of the both footrest portions 101, 101 extends rearward below the right footrest portion 101, covers the drive side transmission pulley 40, and is coupled to the crankcase 29. It passes through the outside of the right cover 35.
[0083]
Accordingly, there is no exhaust pipe 137A below the crankcase 29, and the position of the crankshaft 28 can be lowered by that amount, so that the crankshaft 28 is moved forward as much as possible while preventing the footrest portions 101, 101 from being raised. The scooter-type motorcycle can be made comfortable to ride, and the crankshaft 28 is lowered to sufficiently place the intake device 114 above the engine E. Space can be secured.
[0084]
Further, an exhaust pipe cover 139 that covers the exhaust pipe 137A from the outside is fixed in the middle of the exhaust pipe 137A, and the skirt portion 103 that is integrally connected to the outer edge of one footrest portion 101 and hangs downward. In addition, since the exhaust pipe cover 139 is connected, it is possible to avoid the exhaust pipe cover 139 from being conspicuous and to maintain an excellent appearance, while avoiding an increase in the size of the exhaust pipe cover 139. It is possible to prevent the air flow that flows along the outer surface from being disturbed.
[0085]
In addition, since the attachment position of the exhaust pipe 137A to the engine E having the first cylinder axis C1 extending obliquely upward from the crankcase 29 is set higher than the axis of the crankshaft 28, Thus, the exhaust pipe 137A can be properly arranged, and thereby the bending of the exhaust pipe 137A can be increased to contribute to the improvement of the engine output.
[0086]
In the vehicle body cover 98 that covers the engine E, a partition wall 109 that covers the engine E from above is fixedly disposed so as to form a traveling air passage 110 between the inner surface of the vehicle body cover 98 and an engine that is a heat source. Since the traveling wind passage 110 is formed in the upper part of the vehicle body cover 98 so as to be partitioned by the partition wall 109, the auxiliary equipment affected by heat is arranged in the traveling wind passage 110 so that the auxiliary equipment is arranged. Can be cooled by the traveling wind, and the auxiliary machine can be prevented from being affected by the heat from the engine E. Further, since the engine E is double-covered by the partition wall 109 and the vehicle body cover 98, it can contribute to noise reduction, and can contribute to the improvement of the passenger's thermal environment.
[0087]
Moreover, since the partition wall 109 is interposed between the air cleaner 117 and the engine E, it is not necessary to provide a special heat insulator, and the air cleaner 117 can be prevented from being affected by the heat from the engine E. The engine output is unlikely to decrease due to an increase in intake air temperature.
[0088]
Further, the partition wall 109 extends to below the occupant seats 105 and 106 provided at the rear portion of the vehicle body cover 98, and the fuel tank 130 is disposed between the occupant seats 105 and 106 and the rear portion of the partition wall 109. The fuel tank 130 can be prevented from being affected by heat from the engine E, and in the case of the fuel tank 130, it is possible to suppress the deterioration of the fuel and the instability of the flow rate.
[0089]
Further, since the radiator 134 is disposed below the partition wall 109, it is possible to prevent the influence of the heat radiation from the radiator 134 from affecting other auxiliary machines.
[0090]
The vehicle body frame F includes a pair of rear frames 27 at its rear part, and a pair of left and right stays 68, 68 that rise upward from the rear frames 27 and are fixed to the rear frames 27 are cross members 69. Connected to On the other hand, on both sides of the rear wheel WR, there are disposed a pair of left and right swing arms 65, 65 that pivotally support the rear wheel WR and are supported on the body frame F so as to be swingable. Between the swing arms 65, there are provided stays 68, and rear cushion units 70 arranged outside the swing arms 65, respectively.
[0091]
Therefore, the pair of left and right stays 68 and 68 and the cross member 69 are connected in a gate shape so that the load from the rear cushion units 70 and 70 can be efficiently received by the rear frame 27... And the height of the rear frame 27. It is possible to set the cushion stroke of the rear cushion units 70, 70 long while being rearranged while keeping the position relatively low, and moreover, the space between the two rear frames 27 is effectively utilized, and the distance between the two rear frames 27. The capacity of the storage box 131 arranged in the can be set large.
[0092]
Further, since the battery 132 is disposed between the rear frames 27, it is possible to improve the riding comfort by disposing the battery 132 having a relatively large weight at the center in the width direction of the vehicle body.
[0093]
The upper ends of the rear cushion units 70 are connected to the stays 68 and 68 on both ends of the cross member 69, and the strength of the connecting portions of the rear cushion units 70 and 70 to the stays 68 and 68 by the cross member 69. Increases, and the load from the rear cushion units 70 can be more effectively received.
[0094]
Incidentally, support portions 68a for supporting the loads of the occupant seats 105, 106 are formed on the upper portions of the stays 68, respectively, and the occupant loads can be efficiently supported by the rear cushion units 70.
[0095]
In addition, on the storage box 131, the passenger seats 105 and 106 for closing the upper end opening of the storage box 131 so as to be openable and closable are provided, and the distance between the stays 68 and 68 is greater than the distance between the two rear frames 27. Both stays 68 and 68 are formed so as to be large at least at the upper end. The support portions 68a... Are formed at the upper ends of the stays 68 and 68, and the left and right sides of the storage box 131 are connected to the support portions 68a. ... supported on the upper side, the storage box 131 can be supported more stably while the capacity of the storage box 131 can be increased by setting the width of the storage box 131 larger. The upper occupant load can be efficiently supported by the rear cushion unit 70.
[0096]
FIG. 13 and FIG. 14 show a second embodiment of the present invention, and parts corresponding to the first embodiment are given the same reference numerals.
[0097]
A body frame F ′ of the scooter type motorcycle includes a head pipe 17 that supports a front fork 15 that pivotally supports a front wheel WF and a steering handle 16 that is coupled to the front fork 15, and a head pipe 17. A pair of left and right down frame portions 18 extending downward from the rear, a pair of left and right extension frame portions 19 extending rearward from the upper rear ends of both down frame portions 18 and a rear end of the extension frame portion 19. A pair of left and right support frames 20 extending forward and downward, and a pair of left and right inclined frames 21 connected to the rear ends of the extension frame portions 19 and extending rearward and having the rear ends coupled to each other. The crankcase 29 of the engine E ′ is designed so that the engine E ′ constitutes a part of the diamond-shaped body frame F ′ and the It is attached to the over-time portion 18 ....
[0098]
The engine E ′ includes a crankcase 29 that rotatably supports a crankshaft 28 that has an axis extending in the left-right direction, and a cylinder that is coupled to the crankcase 29 with a cylinder axis C that extends upward from the crankcase 29. A portion 30, a cylinder head 31 coupled to the cylinder portion 30, and a head cover 32 coupled to the cylinder head 31 on the opposite side of the cylinder portion 30 are provided.
[0099]
The down frame portion 18 of the vehicle body frame F ′ is formed between the cylinder portion 30 and the head pipe 17 so as to extend straight in a side view, and is disposed on both sides of the cylinder portion 30.
[0100]
The intake device 141 of the engine E ′ has a throttle body 142 whose downstream end is connected to the upper side surface of the engine E ′, an intake pipe 143 connected to the upstream end of the throttle body 142, and an upstream end of the intake pipe 143. The air cleaner 144 is disposed above the cylinder head 31 and has an inlet 126 disposed behind the head pipe 17. A fuel injection valve 118 is attached to the cylinder head 31.
[0101]
The air cleaner 144 includes a cleaner case 145 that is disposed above the partition wall 109 that is fixedly disposed in the vehicle body cover 98, that is, in front of the traveling air passage 110 and that constitutes a part of the top of the floor tunnel portion 102. The cleaner case 145 has a case front portion 145a extending vertically and a case rear portion 145b extending rearward from the lower portion of the case front portion 145a, as in the first embodiment. It is formed in a substantially L shape so as to extend long in the front-rear direction.
[0102]
Further, the exhaust pipe 137 extending downward from the cylinder head 31 is bent in the same manner as in the first embodiment and extends rearward, and is connected to the exhaust muffler 138.
[0103]
The second embodiment can achieve the same effects as the above embodiment.
[0104]
Further, as in the third embodiment shown in FIG. 15, it has a case front portion 147a extending vertically and a case rear portion 147b extending rearward from the lower portion of the case front portion 147a, and is configured in a substantially L shape in a side view. An air cleaner 146 having a crankcase 147 may be disposed above the cylinder head 31 with the suction port 126 disposed behind the head pipe 17.
[0105]
In the third embodiment, the length in the front-rear direction of the case rear portion 147b is shorter than the case rear portion 145b in the crankcase 145 of the second embodiment, but this third embodiment is similar to the second embodiment. There is an effect.
[0106]
The embodiments of the present invention have been described above. However, 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.
[0107]
【The invention's effect】
  As aboveBookAccording to the invention,In a scooter-type motorcycle in which the engine is covered with a vehicle body cover formed with a pair of left and right footrests and a floor tunnel portion that protrudes upward between the footrests, the scooter type motorcycle is coupled to a forwardly inclined cylinder portion of the engine. At least a part of the air cleaner is disposed in the floor tunnel portion above the cylinder head, and a part of the upper surface of the cleaner case of the air cleaner is exposed to the outside through the opening of the vehicle body cover, and the floor tunnel portion Part of the top surface ofWhile maintaining the straddle property which is an advantage of the scooter type motorcycle, it is possible to sufficiently secure the volume of the air cleaner and to increase the engine displacement and output. In addition, the cooling performance of the engine by the traveling wind can be improved, and the maintainability around the cylinder head can also be improved.
[0108]
According to the second aspect of the invention, the air cleaner and the radiator can be efficiently arranged along the space between the engine, the front wheel and the floor tunnel portion.
[0109]
According to the invention described in claim 3, the space behind the head pipe at the front end of the vehicle body frame can be secured widely as the primary space in the air cleaner, which can contribute to the reduction of intake noise and the improvement of engine output. .
[0110]
Furthermore, according to the fourth aspect of the present invention, it is possible to avoid the inhalation of dust into the air cleaner as much as possible.
[Brief description of the drawings]
FIG. 1 is a side view of a scooter type motorcycle according to a first embodiment.
FIG. 2 is a vertical side view of the scooter type motorcycle with a part of the vehicle body cover omitted.
FIG. 3 is an enlarged vertical side view of the main part of FIG. 1;
4 is an enlarged cross-sectional view of the engine taken along line 4-4 of FIG.
5 is a cross-sectional view taken along line 5-5 of FIG.
6 is a cross-sectional view taken along line 6-6 of FIG.
FIG. 7 is an overall side view of an engine, an intake device, and an exhaust device.
FIG. 8 is a schematic plan view of a transmission device between an engine and a rear wheel, an intake device, and an exhaust device.
9 is an enlarged cross-sectional view taken along line 9-9 of FIG.
10 is a view taken in the direction of arrow 10 in FIG.
FIG. 11 is a partially cutaway plan view of a scooter type motorcycle.
FIG. 12 is a plan view of a partition wall.
FIG. 13 is a side view of the scooter type motorcycle according to the second embodiment corresponding to FIG.
14 is an enlarged vertical sectional side view of a main part of FIG. 13;
15 is a longitudinal side view of the scooter type motorcycle according to the third embodiment corresponding to FIG.
[Explanation of symbols]
17 ... head pipe
30, 30A ... Cylinder part
31, 31A ... Cylinder head
98 ... Body cover
101 ... Foot rest
102 ... Floor tunnel
117, 144, 146 ... Air cleaner
121,145,147 ... cleaner case
121a, 145a, 147a ... case front
121b, 145b, 147b ... rear case
126 ... suction port
134 ... Radiator
C, C1 ... Cylinder axis
E, E '... Engine
F, F '... Body frame

Claims (5)

An engine (E, E ′) having a cylinder part (30A, 30) in which the cylinder axis (C1, C) is inclined forwardly upward includes a pair of left and right footrests (101) and their footrests (101 In a scooter type motorcycle covered with a vehicle body cover (98) formed with a floor tunnel portion (102) raised upward between
At least a part of the air cleaner (117, 144, 146) is disposed in the floor tunnel (102) above the cylinder head (31A, 31) coupled to the cylinder (30A, 30) ,
Part of the upper surface of the cleaner case (121, 145, 147) of the air cleaner (117, 144, 146) is exposed to the outside through the opening of the vehicle body cover (98), and the floor tunnel (102) A scooter type motorcycle characterized in that it constitutes a part of the upper surface of the motorcycle.   The scooter type motorcycle according to claim 1, wherein a radiator (134) is disposed in front of the cylinder portion (30A, 30).   The cleaner case (121) includes a case front portion (121a, 145a, 147a) extending vertically and a case rear portion (121b, 145b, 147b) extending rearward from the lower portion of the case front portion (121a, 145a, 147a). The scooter type motorcycle according to claim 1, wherein the scooter type motorcycle is configured in a substantially L shape in a side view.   The suction port (126) of the air cleaner (117, 144, 146) is opened behind the head pipe (17) provided at the front end of the vehicle body frame (F, F '). A scooter type motorcycle according to any one of the above. The scooter according to any one of claims 1 to 4, wherein the engine (E) is a V-type engine having a second cylinder part (30B) on the rear side of the cylinder part (30A). Type motorcycle.

Images