JP4125429B2 - Motorcycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention includes an engine disposed in front of a rear wheel, a transmission case connected to a crankcase of the engine and extending to one side of the rear wheel, a rear wheel pivotally supported at a rear portion of the transmission case, A front portion of a power unit having a transmission means provided between one end portions of the crankshaft of the engine and housed in the transmission case is swingably supported by a vehicle body frame, and is connected to the other end portion of the crankshaft. The present invention relates to a motorcycle to which a starter / power generator is connected.
[0002]
[Prior art]
  Japanese Laid-Open Patent Publication No. 8-175473 discloses a conventional starting and power generating device connected to a crankshaft of an engine provided in a power unit that is swingably supported on a body frame.
[0003]
[Problems to be solved by the invention]
  By the way, the starter / generator has a function as a starter motor that rotates and starts the crankshaft of the engine when the engine is started, and a function as a generator that is driven by the rotational power of the crankshaft. Depending on the engine mounted on the motorcycle, the torque required to start the engine changes. Therefore, the performance required for the function of the starter motor in the starter / power generator varies from engine to engine. The external shape will also change depending on the engine.
[0004]
  On the other hand, in a motorcycle of a type in which a power unit is swingably supported on a body frame, an engine crankshaft disposed in front of a rear wheel is close to the rear wheel. For this reason, depending on the arrangement of the starter / generator, it may be necessary to devise the design of the power unit according to the type of engine so as to avoid interference between the starter / generator and the rear wheels, In addition, the rear wheel must be arranged more rearward, and the wheelbase may extend.
[0005]
  The present invention has been made in view of such circumstances, and reliably prevents interference between the starter / power generator and the rear wheels while avoiding design changes according to the type of engine and extension of the wheel base. An object is to provide a motorcycle.
[0006]
[Means for Solving the Problems]
  In order to achieve the above object, an invention according to claim 1 includes an engine disposed in front of a rear wheel, a transmission case connected to a crankcase of the engine and extending to one side of the rear wheel, A front portion of a power unit having a rear wheel pivotally supported at the rear portion of the transmission case and a transmission means provided between one end portions of the crankshaft of the engine and housed in the transmission case can swing on the vehicle body frame. In the motorcycle in which the starter / power generator is connected to the other end of the crankshaft, the starter / power generator is located outward from the side end of the rear wheel opposite to the transmission case. A portion of the stator case that is disposed and connected to the crankshaft and that covers the starter / power generator and that faces the outer periphery of the starter / power generator overlaps a part of the rear wheel in a direction along the axis of the crankshaft. Yo It is located inA storage chamber for storing a driven sprocket fixed to the valve camshaft of the engine and an endless cam chain wound around a drive sprocket fixed to the crankshaft includes the cylinder of the engine and the starter / generator The portion of the crankcase that forms a part of the peripheral wall of the storage chamber and that faces the outer periphery of the drive sprocket is positioned on the front side of the rear end portion of the stator case. And it is arranged so as to overlap a part of the starter / power generator in a direction along the axis of the crankshaft.It is characterized by that.
[0007]
  According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, a rotational speed sensor that detects the rotational speed of the crankshaft is opposed to the outer periphery of the starter / power generator, and It is fixedly arranged at a position overlapping with a part of the rear wheel in a direction along the axis..
[0008]
  Claim3The described invention is claimed.1 or 2In addition to the configuration of the invention described above, the starter / power generator includes an inner rotor and an outer stator, and a portion of the cylinder block that faces the outer periphery of the drive sprocket extends in the direction along the axis of the crankshaft. It is arranged to overlap with a part of the outer stator.
[0009]
  Claim4The invention described in claims 1 to3In addition to the configuration of any of the inventions described above, an auxiliary machine driven by a valve camshaft included in the engine is configured to perform the start-up function with respect to a cam chain wound around a driven sprocket fixed to the valve camshaft. It is arranged on the same side as the power generation device.
[0010]
  Claim5According to the invention described above, in addition to the configuration of the invention according to claim 1, the engine is a four-cycle engine.
[0011]
  Further claims6The described invention is claimed.5In addition to the configuration of the invention described above, the engine is mounted with its cylinder axis substantially horizontal.
[0012]
  Claims 1 to6According to the described invention, regardless of the type of engine, the starter / power generator is disposed on the outer side of the rear wheel,In addition, the portion of the stator case covering the starter / power generator that faces the outer periphery of the starter / power generator is arranged so as to overlap a part of the rear wheel in the direction along the axis of the crankshaft. The part of the crankcase that forms part of the peripheral wall of the cam chain storage chamber that is located between the drive and the outer periphery of the drive sprocket is positioned in front of the rear end of the stator case that covers the starter / power generator. In such a manner, it is arranged so as to overlap a part of the starter / power generator in a direction along the axis of the crankshaft. With the above,The design change according to the type of engine and the extension of the wheel base can be avoided, and the interference between the starter / power generator and the rear wheel can be surely prevented.
[0013]
  By the way, a 4-cycle engine has a longer cylinder head in the direction along the cylinder axis than a 2-cycle engine, and a motorcycle equipped with a 4-cycle engine has a wheelbase that is larger than a motorcycle with a 2-cycle engine. In addition, since the starting torque required for starting the 4-cycle engine is larger than the starting torque of the 2-cycle engine, the starter / power generator must be increased in size. For this reason, the above claims5By applying the invention according to claim 1 to a motorcycle equipped with a four-cycle engine according to the configuration of the invention described in the above, it is possible to avoid a design change according to the type of engine and an extension of the wheel base, and The effect of reliably preventing rear wheel interference can be obtained more remarkably.
[0014]
  More particularly the claims6According to the described invention, it is possible to obtain the effect of reliably preventing interference between the starter / power generator and the rear wheel by avoiding the design change according to the type of engine and the extension of the wheel base.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
  Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the accompanying drawings.
[0016]
  1 to 14 show a first embodiment of the present invention. FIG. 1 is a side view of a scooter type motorcycle, FIG. 2 is a sectional view of a power unit taken along line 2-2 of FIG. 1, and FIG. 2 is an enlarged cross-sectional view of the engine and compressor shown in FIG. 2, FIG. 4 is an enlarged cross-sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a diagram showing opening / closing timings of intake valves, exhaust valves, and supercharging valves. FIG. 7 is an enlarged cross-sectional view of the starter / power generator of FIG. 2, FIG. 7 is a circuit diagram showing the configuration of an electric circuit related to the commutator of the rotating electrical machine, and FIG. 9 is an enlarged cross-sectional view taken along line 9-9 in FIG. 6, FIG. 10 is a view showing a state in which the weight roller is inclined in the housing recess, FIG. 11 is a view showing a control system of the engine and the rotating electrical machine, and FIG. Throttle opening, crankshaft rotation speed and clan FIG. 13 is a diagram showing the output torque of the shaft over time, FIG. 13 is a diagram showing the relationship between the motor output when the assist torque is applied, the engine speed and the throttle opening, and FIG. 14 is the throttle opening when the assist torque is applied. It is a figure which shows a crankshaft rotation speed and the output torque of a crankshaft according to time passage.
[0017]
  First, in FIG. 1, a vehicle body frame F of a scooter type motorcycle includes a head pipe 12 that supports a front fork 11 with a front wheel WF suspended therein, a down tube 13 that extends downward from the head pipe 12, and A rear frame 14 or the like that is provided at the lower end of the down tube 13 and extends rearward is provided. The rear frame 14 has a front end connected to the lower end of the down tube 13 and extends substantially horizontally toward the rear side, and a pair of front frame portions 14a... And rear frame 14a. It has a pair of intermediate frame portions 14b, and a rear frame portion 14c that connects the rear ends of the intermediate frame portions 14b, and is formed in an approximately elliptical shape in plan view.
[0018]
  The vehicle body frame F is covered with a vehicle body cover 15 having a floor board 15a that supports the feet of the driver, and a seat 16 on which the driver sits is provided at the rear of the vehicle body cover 15.
[0019]
  A front portion of the power unit P is supported on the intermediate frame portion 14b of the rear frame 14 in the vehicle body frame F so as to be able to swing around the axis of rotation of the rear wheel WR around a parallel axis, and the rear wheel WR is mounted on the rear portion of the power unit P. Is supported.
[0020]
  In FIG. 2, the power unit P includes a water-cooled four-cycle single-cylinder engine E disposed in front of a rear wheel WR, transmission means 17 provided between the engine E and the rear wheel WR, and the engine E. And a starter / generator 18 connected thereto.
[0021]
  3 and 4 together, the cylinder block 20 of the engine E is arranged so that the axis of the cylinder 21 provided in the cylinder block 20 is substantially horizontal along the front-rear direction of the motorcycle. A combustion chamber 24 is formed between a cylinder head 22 coupled to the cylinder block 20 and a piston 23 slidably fitted to the cylinder 21. The piston 23 is connected to a crankshaft 27 having a rotation axis parallel to the rotation axis of the rear wheel WR via a connecting rod 25 and a crankpin 26. The crankshaft 27 is integrated with the cylinder block 20. The crankcase 28 is rotatably supported via first and second ball bearings 29 and 30.
[0022]
  The cylinder head 22 is provided with an intake port 31, an exhaust port 32, and a supercharging port 33 that are respectively connected to the combustion chamber 24. An intake valve 34 and an exhaust valve 35 that open and close the intake port 31 and the exhaust port 32 respectively are arranged in a substantially V shape on a projection view on a plane including the rotation axis of the crankshaft 27 and the axis of the cylinder 21. A supercharging valve 36 that is attached to the head 22 and opens and closes the supercharging port 33 and a spark plug 37 that faces the combustion chamber 24 substantially V in a direction crossing the parallel direction of the intake valve 34 and the exhaust valve 35. It is attached to the cylinder head 22 so as to be arranged in a letter shape. Thus, the intake valve 34, the exhaust valve 35 and the supercharging valve 36 are spring-biased in the direction in which the intake port 31, the exhaust port 32 and the supercharging port 33 are closed.
[0023]
  One end of a valve cam shaft 38 having an axis parallel to the axis of the crankshaft 27 is rotatably supported on the cylinder head 22 via a third ball bearing 39 and the longitudinal direction of the valve camshaft 38 is An intermediate portion is rotatably supported via a fourth ball bearing 40, and the valve cam shaft 38 has intake and exhaust cams 41 disposed between the third and fourth ball bearings 39 and 40. , 42 and a supercharging cam 43 disposed outside the fourth ball bearing 40. Thus, the intake cam 41 and the exhaust cam 42 are respectively engaged with the intake valve 34 and the exhaust valve 35 via the intake and exhaust rocker arms 44 and 45, respectively, and are formed in a tapered shape. 43 is directly engaged with the supercharging valve 36.
[0024]
  A driven sprocket 48 is fixed to the valve camshaft 38 at a position adjacent to the supercharging cam 43 on the side opposite to the fourth ball bearing 40. On the other hand, a driving sprocket 49 is fixed at a position corresponding to the driven sprocket 48 on the outer side of the second ball bearing 30 on the crankshaft 27, and an endless cam chain is provided on the driving and driven sprockets 49, 48. 50 is wound. The valve drive camshaft 38 is rotationally driven by the drive sprocket 49, the driven sprocket 48, and the cam chain 50 at a rotational speed that is half the rotational speed of the crankshaft 27. As a result, the intake valve 34, the exhaust valve 35, and the supercharging valve 36 are opened / closed at the timing shown in FIG. 5, and the supercharging valve 36 is opened immediately before the intake valve 34 is closed.
[0025]
  The cylinder block 20 and the cylinder head 22 are formed with a storage chamber 51 in which the drive sprocket 49, the driven sprocket 48, and the cam chain 50 are stored. The storage chamber 51 is a portion that faces the other end of the valve camshaft 38. , The opening 52 provided in the cylinder head 22 is closed by a lid member 53. An opening 54 that leads to the storage chamber 51 is provided in the crankcase 28 at a portion facing the crankshaft 27, and the opening 54 is closed by the starter / power generator 18.
[0026]
  In the storage chamber 51, a drive gear 55 is fixed between the drive sprocket 49 of the crankshaft 27 and the second ball bearing 30, and an oil pump (not shown) is driven by the drive gear 55.
[0027]
  Incidentally, an intake device 58 (see FIG. 1) including an air cleaner 56 and a carburetor 57 and an exhaust device (not shown) are connected to the intake port 31 and the exhaust port 32, respectively. Is connected to a reciprocating compressor 60. The compressor 60 is driven by the valve drive cam shaft 38 and is disposed adjacent to the outer side of the lid member 53 coupled to the cylinder head 22 so as to close the opening 52 of the storage chamber 51. .
[0028]
  The compressor 60 includes a cylinder body 62 having a cylinder hole 61 extending parallel to the axis of the cylinder 21 in the engine E, and first and second pumps coupled to the cylinder body 62 so as to close both ends of the cylinder hole 61. A first pump chamber 65 is formed between the cylinder heads 63, 64 and the first pump cylinder head 63, and a second pump chamber 66 is formed between the second pump cylinder head 64 and sliding into the cylinder hole 61. And a pump piston 67 that is movably fitted.
[0029]
  A pump crankshaft 68 having a rotational axis coaxial with the valve drive camshaft 38 in the engine E is rotatably supported via fifth and sixth ball bearings 69 and 70 at an intermediate portion in the axial direction of the cylinder body 62. One end of the pump crankshaft 68 passes through the cylinder body 62 and the lid member 53 in a rotatable manner, and is coaxially connected to the other end of the valve operating camshaft 38 in the storage chamber 51 so as not to be relatively rotatable. That is, the pump crankshaft 68 rotates together with the valve operating camshaft 38, and an annular seal member 71 is provided between the lid member 53 and the pump crankshaft 68.
[0030]
  The pump piston 67 is connected to the pump crankshaft 68 through a connecting rod 72. The pump piston 67 interferes with the reciprocating operation of the pump piston 67 according to the rotation of the pump crankshaft 68. An operating hole 73 that allows the pump crankshaft 68 to pass therethrough is provided.
[0031]
  The first and second pump cylinder heads 63 and 64 are provided with annular discharge chambers 74 and 75, respectively, and suction chambers 76 and 77 are provided so as to be surrounded by the discharge chambers 74 and 75, respectively. The discharge chambers 74 and 75 are in communication with each other, and the suction chambers 76 and 77 are in communication with each other.
[0032]
  Both suction chambers 76 and 77 are communicated with the suction device 58, and between the suction chambers 76 and 77 and the two pump chambers 65 and 66, the valve chambers 65 and 66 are opened in response to the low pressure. A suction valve (not shown) is provided. Further, a discharge valve (not shown) is provided between the discharge chambers 74 and 75 and the pump chambers 65 and 66, and the pump chambers 65 and 66 are opened in response to the high pressure. A discharge conduit 78 having one end passing through one end of 75, for example, 74, is provided between the pump cylinder heads 63 and 64, and the other end of the discharge conduit 78 is connected to one end of a discharge passage 79 provided in the second pump cylinder head 64. Communicate. Further, the lid member 53 that closes the opening 52 is integrally formed with a conduit portion 81 that forms a passage 80 that communicates with the other end of the discharge passage 79. The conduit portion 81 is connected to the other end of the passage 80. Is connected to the cylinder head 22 of the engine E in an airtight manner so as to communicate with the supercharging port 33.
[0033]
  By such a reciprocating compressor 60, air is pushed into the combustion chamber 24 from the supercharging port 33 in response to opening of the supercharging valve 36 immediately before the intake valve 34 is closed when the engine E is operated. As a result, the charging efficiency is improved and the output torque of the engine E is increased.
[0034]
  Referring again to FIG. 2, the transmission case 84 extending to the left side of the rear wheel WR is connected to the crankcase 28 of the engine E in a state of facing the front in the traveling direction of the motorcycle. The transmission case 84 includes a case main body 85 coupled to the crankcase 28, a left cover 86 that is fastened to the case main body 85 from the left side by forming a first transmission chamber 88 between the case main body 85, A second transmission chamber 89 is formed between the case main body 85 and a right cover 87 fastened to the right rear portion of the case main body 85.
[0035]
  A support arm 90 is projected from a front portion of the case main body 85 in the transmission case 84 so as to be disposed on the side of the cylinder block 20 in the engine E, and the support arm 90 is connected to the vehicle body frame F. Are pivotally supported by the intermediate frame portions 14b of the rear frame 14.
[0036]
  The axle 91 of the rear wheel WR is rotatably supported by the rear part of the case main body 85 and the right cover 87 in the transmission case 84. As shown in FIG. 1, a rear cushion 92 is provided between the rear portion of the case main body 85 and the intermediate frame portion 14 b in the rear frame 14 of the vehicle body frame F.
[0037]
  The transmission means 17 provided between the engine E and the rear wheel WR includes a V-belt type continuously variable transmission mechanism 93 housed in the first transmission chamber 88, and a deceleration provided between the continuously variable transmission mechanism 93 and the axle 91. And a gear train 94.
[0038]
  The continuously variable transmission mechanism 93 has a drive-side transmission pulley 95 connected to one end of the crankshaft 27 and an axis parallel to the crankshaft 27 and is rotatably supported by the rear portion of the case main body 85 and the right cover 87. A driven-side transmission pulley 98 attached to the driven shaft 96 via a centrifugal clutch 97 and an endless V-belt 99 wound around both the transmission pulleys 95 and 98 are provided.
[0039]
  The drive-side transmission pulley 95 includes a fixed pulley half 95a that is fixed to the crankshaft 27 and a movable pulley half 95b that is slidably mounted on the crankshaft 27 in the axial direction. A V-shaped annular groove 100 is formed between the pulley halves 95a and 95b, and a V-belt 99 is inserted into the annular groove 100. The ramp plate 101 is fixed to the crankshaft 27 on the back side of the movable pulley half 95a, and a plurality of weight rollers 102 are accommodated in a floating state between the movable pulley half 95a and the ramp plate 101. Thus, when the rotational speed of the crankshaft 27 increases, the weight roller 102 receiving the centrifugal force moves radially outward of the crankshaft 27 to bring the movable pulley half 95a close to the fixed pulley half 95b. This increases the contact radius of the V-belt 99 to both pulley halves 95a and 95b.
[0040]
  On the other hand, the driven side transmission pulley 98 is connected to a driven shaft 96 via a centrifugal clutch 97 and is rotatably supported on the driven shaft 96, and a fixed pulley half formed integrally with the support tube 103. A body 98a and a movable pulley half 98b that is supported by the support cylinder 103 so as to be close to and away from the fixed pulley half 98a and is spring-biased in a direction close to the fixed pulley half 98a. A V-belt 99 is inserted into a V-shaped annular groove 104 formed between the halves 98a and 98b. Thus, as the contact radius of the V-belt 99 to the drive-side transmission pulley 95 increases, the movable pulley half 98a decreases so that the contact radius of the V-belt 99 to the driven-side transmission pulley 98 of the V-belt 99 decreases. Then, the movable pulley half 98b moves in the axial direction, whereby a continuously variable transmission according to the rotation of the crankshaft 27 between the crankshaft 27 and the driven shaft 96 is performed.
[0041]
  A kick shaft 106 is rotatably supported on the left cover 86 of the transmission case 84, and a kick pedal 105 (see FIG. 1) is provided on the outer end of the kick shaft 106. A kick-type starter 107 is provided between the kick shaft 106 and the crankshaft 27 on the inner surface side of the left cover 86 so that the power of the kickshaft 106 according to the depression operation of the kick pedal 105 can be transmitted to the crankshaft 27. Provided.
[0042]
  The reduction gear train 94 is provided between the driven shaft 96 and the axle 91 and is housed in the second transmission chamber 89. The rotational power of the driven shaft 96 in the continuously variable transmission mechanism 93 is reduced by the reduction gear train 94. To the axle 91 of the rear wheel WR.
[0043]
  The starter / power generator 18 includes a rotating electrical machine 110 and a centrifugal governor 111. The starter / power generator 18 is connected to the other end of the crankshaft 27 of the engine E, that is, the end of the crankshaft 27 opposite to the side to which the continuously variable transmission mechanism 93 of the transmission means 17 is connected. The wheel WR is disposed on the outer side of the side end opposite to the transmission case 84.
[0044]
  Rotating electrical machine 110 is in a state that functions as a starter motor that applies start torque to engine E, a state that functions as an assist motor that applies assist torque to engine E, and a generator that is driven by the power of engine E The power unit P is configured in a hybrid type including an engine E, a transmission means 17, and a motor (rotary electric machine 110) that assists the output of the engine E. Become.
[0045]
  In FIG. 6, the rotating electrical machine 110 includes an inner rotor 112 that is fixed to the other end of the crankshaft 27, an outer stator 113 that surrounds the inner rotor 112, and a commutator 114 that is fixedly supported by the outer stator 113. The brush assembly 115 is disposed between the commutator 114 and the inner rotor 112 and is spring-biased in a direction close to the commutator 114.
[0046]
  The inner rotor 112 is formed by providing a magnet 117 on the outer periphery of the rotor boss 116, and a tapered shaft portion 27 a provided coaxially with the other end portion of the crankshaft 27 is fitted to the rotor boss 116 and protrudes from the rotor boss 116. The nut 118 is screwed onto the end of the crankshaft 27, whereby the rotor boss 116 is fixed to the other end of the crankshaft 27. A rotor cover 119 that covers the magnet 117 is fixed to the rotor boss 116.
[0047]
  The outer stator 113 is formed by, for example, winding a single-phase 6-pole coil 121 around a stator core 120, and the stator core 120 is fixed to the stator case 122. The stator case 122 is formed in a bowl shape so as to cover the inner side of the stator core 120, the commutator 114, and the brush assembly 115 along the axial direction of the crankshaft 27 in the coil 21. The opening 54 provided in the crankcase 28 is fastened to the crankcase 28 so as to be closed by the end wall 122 a of the stator case 122. The crankshaft 27 passes through the central portion of the end wall 122 a of the stator case 122 so as to freely rotate, and an annular seal member 123 is provided between the inner peripheral portion of the end wall 122 a and the outer periphery of the stator case 122.
[0048]
  The commutator 114 is opposed to the brush assembly 115 of the commutator holder 124 that has a through hole 124a that allows the crankshaft 27 to pass through gently in the center and is formed in a substantially disk shape from a non-conductive material such as synthetic resin. As shown in FIG. 7, an annular first conductive path 125, an annular second conductive path 126 that coaxially surrounds the first conductive path 125, and a periphery of the second conductive path 126 are formed on the surface. The number of commutator pieces 127 corresponding to the number of poles of the coil 121, for example, six commutator pieces 127 is provided, and the commutator holder 124 is opposed to the inner surface of the end wall 122a of the stator case 122. And fixedly supported by the stator core 119.
[0049]
  The first conductive path 125 is connected to the negative terminal of the battery 128, the second conductive path 126 is connected to the positive terminal of the battery 128 via the relay switch 131, and each commutator piece 127 is connected to the outer stator 113. It is connected to the connection point between the coils 121 of each pole.
[0050]
  A relay coil 132 and a starter switch 129 are connected in series between the plus side and minus side terminals of the battery 128, and the relay coil 132 and the relay switch 131 constitute a starter relay 130. That is, the relay switch 131 is turned on according to the excitation of the relay coil 132 according to the conduction of the starter switch 129.
[0051]
  The brush assembly 115 can rotate around the axis of the crankshaft 27 together with the inner rotor 112, and can reciprocate in the axial direction of the crankshaft 27. The nonconductive material is disposed between the commutator 114 and the inner rotor 112. The brush holder 133 made of is provided. A coiled spring 134 surrounding the crankshaft 27 is provided between the brush holder 133 and the rotor boss 116 of the inner rotor 112, and the brush holder 133, that is, the brush assembly, is provided by the spring force of the spring 134. 115 is biased in a direction approaching the commutator 114.
[0052]
  Referring also to FIG. 8, the brush holder 133 is connected to the negative common brush 135 that is always in sliding contact with the first conductive path 125 of the commutator 114 and the negative common brush 135 and is connected to the commutator 114. Commonly connected to the three minus side individual brushes 136 that can be slidably contacted with the child pieces 127, the plus side common brush 137 that is always in slidable contact with the second conductive path 126 of the commutator 114, and the plus side common brush 137. In addition, three plus-side individual brushes 138 slidably contacted with the commutator pieces 127 of the commutator 114 are held while being spring-biased toward the commutator 114 side.
[0053]
  Referring again to FIG. 6, the centrifugal governor 111 is formed integrally with the rotor boss 116 of the inner rotor 112 so as to be fixed to the crankshaft 27, and the moving body 141 disposed to face the rotating body 140. And a plurality of weight rollers 142 interposed between the rotating body 140 and the moving body 141.
[0054]
  Referring also to FIG. 9, the rotating body 140 is integrally formed with the rotor boss 116 on the side opposite to the brush assembly 115. On the outer end surface of the rotating body 140, that is, the surface facing the brush assembly 115, a cylindrical portion 143 that is coaxial with the crankshaft 27, a circular concave portion 144 that surrounds the cylindrical portion 143, An annular groove 145 that opens to the inner peripheral edge and is flush with the outer surface of the cylindrical portion 143, and receiving recesses 146 that are arranged at equal intervals in the circumferential direction of the recess 144, for example, 6 locations, are provided. .
[0055]
  The cylindrical portion 143 is formed to have an inner diameter that allows insertion of a nut 118 that is screwed into the other end of the crankshaft 24, and the nut 118 is screwed to the other end of the crankshaft 27 in the cylindrical portion 143. Combined.
[0056]
  Each housing recess 146 is formed so as to extend from the annular groove 145 along the radial direction of the rotating body 140, and each housing recess 146... Is gradually shallower toward the outer side along the radial direction of the rotating body 140. Recesses 146 are formed.
[0057]
  On the other hand, the movable body 141 includes a guide cylinder portion 147 that is slidable along the axial direction of the crankshaft 27 and is fitted in the annular groove 145 of the rotating body 140, and a radially outer side from the outer end of the guide cylinder portion 147. And a disc-shaped contact plate portion 148 that protrudes in the direction and is accommodated in the concave portion 144 of the rotating body 140, and the contact plate portion 148 of the moving body 141 faces the rotating body 140.
[0058]
  On the other hand, the brush holder 133 in the brush assembly 115 is connected to one end of a plurality of, for example, a pair of connecting shafts 149 and 149 having an axis parallel to the crankshaft 27 and penetrating the rotating body 140 and the rotor boss 116. The other ends of the connecting shafts 149 and 149 are connected to the contact plate portion 148 in the moving body 141. Therefore, the abutting plate portion 148, that is, the moving body 141 cannot be rotated relative to the rotating body 140, that is, the inner rotor 112, but can move close to or away from the rotating body 140 along the axial direction of the crankshaft 27. Since the brush holder 133 is biased by the spring 134 in the direction close to the fixed commutator 114, the moving body 141 is also spring biased in the direction close to the rotating body 140.
[0059]
  Thus, in one of the opposing surfaces of the rotating body 140 and the moving body 141, in this embodiment, the housing provided at a plurality of places, for example, six places, spaced in the circumferential direction of the facing surface of the rotating body 140 to the moving body 141. Short columnar weight rollers 142 are accommodated in the recesses 146 so as to be interposed between the rotating body 140 and the contact plate portion 148 of the moving body 141.
[0060]
  In such a centrifugal governor 111, each weight roller 142... Is accommodated in the receiving recess 146 as the centrifugal force acting on each weight roller 142. ... inwardly moving toward the radially outward side of the rotator 140, and the depth of each of the receiving recesses 146 is shallower toward the outside along the radial direction of the rotator 140, The moving body 141 is pushed away from the rotating body 140 by the weight rollers 142. Accordingly, when the rotational speed of the crankshaft 27 becomes equal to or higher than a predetermined rotational speed set to be equal to or lower than the idle rotational speed, the brush assembly 115 is separated from the commutator 114 so that the brushes 135, 136, 137, 138,. The commutator 114 is separated from the first conductive path 125, the second conductive path 126, and the commutator pieces 127.
[0061]
  Thus, the weights of the weight rollers 142 are caused by the centrifugal force acting on the weight rollers 142 when the rotational speed of the engine E is equal to or higher than a predetermined rotational speed smaller than the idle rotational speed. .., 137, 138... Are set so as to be separated from the first conductive path 125, the second conductive path 126, and the respective commutator pieces 127. Is relatively small.
[0062]
  As described above, when the outer diameter of each weight roller 142 is relatively small, there is a slight gap between both ends of the weight roller 142 and both inner side surfaces of the accommodating recess 146 as shown in FIG. Therefore, the weight roller 142 is easily inclined in the housing recess 146. When the weight roller 142 is inclined in the accommodation recess 146 in this way, the chamfering process is not performed on the outer edges of both ends of the weight roller 142, or the chamfered part is tapered even if the chamfering process is performed. In some cases, the outer edges of both ends of the weight roller 142 may be caught in the inner surface of the housing recess 146 and locked. Therefore, in order to avoid the occurrence of lock due to the biting of the outer edges of the weight roller 142, the outer surfaces of the both ends of the weight roller 142 are formed with arcuate surfaces 142a to have an arcuate vertical cross-sectional shape bulging outward. Each is formed.
[0063]
  Moreover, grease 150 as a lubricant is filled in each of the housing recesses 146.
[0064]
  A pulsar rotor 151 protruding outward from the outer periphery of the rotator 140 is fastened to an end surface of the rotator 140 opposite to the brush assembly 133 so as to close the recess 144, and is externally connected to the pulsar rotor 151. The cooling fan 152 to be arranged is also fastened to the rotating body 140 together with the pulsar rotor 151. That is, the pulsar rotor 151 is fixed to the outer end of the crankshaft 27 so as to substantially seal each of the receiving recesses 146 of the centrifugal governor 111.
[0065]
  On the other hand, a rotation speed sensor 153 facing the outer periphery of the pulsar rotor 151 is attached to the stator case 122, and the rotation speed sensor 153 detects the rotation speed of the crankshaft 27, that is, the engine E.
[0066]
  The engine E and the starter / power generator 18 are covered with a shroud 155 indicated by a chain line in FIG. 2, and the shroud 155 has a cooling air intake 156 corresponding to the cooling fan 152 of the starter / power generator 18. Provided. Therefore, by the rotation of the cooling fan 152 according to the rotation of the crankshaft 27, the cooling air is taken into the shroud 155 from the cooling air inlet 156, and the engine E and the rotating electrical machine 110 are cooled by the cooling air. . In addition, a radiator 158 that circulates the cooling water between the cylinder block 20 of the engine E and the water jacket 157 provided in the cylinder head 22 is placed in the middle of the flow path of the cooling air from the cooling fan 152 in the shroud 155. It is fixedly arranged on the front side of the starter / power generator 18 so that the portion is exposed and the remaining portion protrudes from the shroud 155.
[0067]
  In FIG. 11, the ignition device 161 connected to the spark plug 37 in the engine E is controlled by the control unit 162, and the control unit 162 includes a rotation speed sensor 153 that detects the rotation speed of the engine E. The detection value, the detection value of the throttle sensor 164 attached to the throttle grip 163, the signal from the idle switch 165 for permitting or limiting idling of the engine E, and the detection value of the vehicle speed sensor 166 for detecting the vehicle speed are input. .
[0068]
  Thus, the control unit 162 stops the operation of the engine E when the motorcycle is stopped, that is, when the value detected by the vehicle speed sensor 166 indicates the stopped state of the motorcycle, and at the time of starting from the stopped state of the motorcycle. That is, the stop start mode in which the engine E is started in accordance with the operation of the throttle grip 163 in the stop state, and the idling permission mode in which idling is permitted for the purpose of warm-up operation at the start of the engine E, etc. It can be switched according to the operation of the idle switch 165.
[0069]
  The rotating electrical machine 110 is provided with an energization control circuit 167, and the control unit 162 controls the start of the rotating electrical machine 110 as a starter motor when the engine E is started regardless of the stop start mode and the idling permission mode. Mode, an assist control mode in which the rotating electric machine 110 functions as an assist motor when starting the motorcycle in the stop / start mode and idling permission mode, and rotation while the motorcycle is running regardless of the stop / start mode and idling permission mode. The energization control circuit 167 is controlled by switching between three control modes: a power generation control mode in which the electric machine 110 functions as a generator.
[0070]
  As shown in FIG. 7, the energization control circuit 167 includes an FET (field effect transistor) 168 as an energization control element interposed between the connection point between the coils 121 of each pole and the negative terminal of the battery 128. ..., FETs 169... Serving as energization control elements interposed between the connection points of the coils 121 of each pole and the positive side terminal of the battery 128, and diodes 170 connected in parallel to the FETs 168. , 171...
[0071]
  The start control mode of the control unit 162 includes a state where the engine speed is equal to or less than a predetermined speed less than the idle speed, a state where the starter switch 129 is pressed, and the brushes 135, 136, 137,. , 138... Are detected in any of the states in which they are in contact with the first conductive path 125, the second conductive path 126 and the commutators 127... Of the commutator 114. The FETs 168,..., 169, etc. in the energization control circuit 167 are cut off. Thus, when the engine E is in a stopped state, the brush assembly 115 causes the brushes 135, 136, 137,..., 138, ... to pass through the first conductive path 125, the second conductive path 126, and the commutators 127, respectively, of the commutator 114. Since the rotating electrical machine 110 acts as a brush motor so as to be in sliding contact with each other, the coils 121 of the outer stator 113 are activated by the conduction of the relay switch 131 according to the conduction operation of the starter switch 129. Current from the battery 128 flows. As a result, the inner rotor 112 rotates and the starting torque is applied to the crankshaft 27 from the inner rotor 112.
[0072]
  When the engine E is started by applying a starting torque from the rotating electrical machine 110 functioning as a starter motor, and the rotational speed of the engine E becomes equal to or higher than the predetermined rotational speed, the centrifugal governor 111 has the brushes 135, 136, 137,. Is moved away from the first conductive path 125, the second conductive path 126 and the commutators 127 of the commutator 114, thereby stopping the application of starting torque from the rotating electrical machine 110 to the engine E. Is done.
[0073]
  The assist control mode at the time of starting of the motorcycle in the stop / start mode is to apply an assist torque to the engine E for a predetermined time T from the time when the engine speed becomes equal to or higher than a set speed NS set larger than the idle speed NS. The control unit 162 operates the rotating electrical machine 110 so as to be given. In this assist control mode, the control unit 162 controls the conduction / cutoff of the FETs 168..., 169... In the energization control circuit 167 based on the detection values of the rotation speed sensor 153 and the throttle sensor 164. Will work as a brushless motor.
[0074]
  Thus, as shown in FIG. 12 (a), when the throttle opening is increased by the throttle grip 163 to start the motorcycle in the stop / start mode, the engine speed is increased as shown in FIG. 12 (b). When the crankshaft 27 is rotationally driven by the rotating electrical machine 110 from when the rotation speed NS becomes equal to or higher than the set rotational speed NS until the set time T elapses, the rotational speed of the crankshaft 27 is rotated by the rotation of the engine E as indicated by the shaded portion. It will increase with the number. Further, as shown in FIG. 12C, the output torque of the crankshaft 27 is increased by adding the assist torque from the rotating electrical machine 110 as indicated by the hatched portion.
[0075]
  At this time, as shown in FIG. 13, the output torque of the rotating electrical machine 110 that functions as an assist motor changes according to the engine speed and the throttle opening so as to increase linearly as the throttle opening increases. The control unit 162 controls the conduction / cutoff of the FETs 168..., 169... In the energization control circuit 167 so that the output torque of the rotating electrical machine 110 changes.
[0076]
  Even in the assist control mode when the motorcycle starts in the idling permission mode, the control unit 162 determines whether the control unit 162 in the energization control circuit 167 is based on the detection values of the rotation speed sensor 153 and the throttle sensor 164. Controls the conduction / cutoff of the FETs 168..., 169.
[0077]
  Accordingly, as shown in FIG. 14 (a), when the throttle opening is increased by the throttle grip 163 to start the motorcycle after warming up by idling, the engine speed is set as shown in FIG. 14 (b). When the crankshaft 27 is rotationally driven by the rotating electrical machine 110 from the time when the rotational speed NS or more is reached, the rotational speed of the crankshaft 27 increases on top of the rotational speed of the engine E as indicated by the hatched portion. Further, as shown in FIG. 14C, the output torque of the crankshaft 27 is increased by adding the assist torque from the rotating electrical machine 110 as indicated by the hatched portion.
[0078]
  Thus, the rotating electrical machine 110 functions as a starter motor that is a brush motor in the start control mode, and functions as an assist motor that is a brushless motor in the assist control mode. Thus, the torque required for the starter motor is relatively large. By using the brush motor, the rotating electrical machine 110 can output a large torque by flowing a large current through the coil 121. Further, the torque required for the assist motor when the vehicle starts is relatively small, and delicate output control according to the engine speed and the throttle opening is required. Therefore, by using the rotating electrical machine 110 as a brushless motor, An inexpensive energization control element that does not need to withstand a large current, FETs 168... 169. Further, the brushless motor generally requires a rotation sensor capable of detecting an absolute angle for its activation. However, since the rotating electric machine 110 functions as a brushless motor in the rotation state of the engine E, the reference angle can be detected. It is easy and the structure of the rotation sensor can be simplified.
[0079]
  By the way, when a brushless motor is used as a starter motor, an expensive element that can withstand a large current is required as an energization control element, and when a brush motor is used as an assist motor, the motor frequently turns on and off. Maintenance due to brush wear becomes complicated.
[0080]
  The power generation control mode is executed in a state in which the engine E is rotating at a rotation speed equal to or higher than the set rotation speed NS and is not in the assist control mode. In this power generation control mode, the control unit 162 first performs the battery 128. The FETs 168 connected to the minus side connection terminals of the battery 128 are turned on while the FETs 169 connected to the plus side connection terminals are cut off. As a result, the power generation voltage of the coil 121 is boosted as indicated by the solid line arrow in FIG. Next, the control unit 162 blocks the FETs 168 connected to the minus side connection terminals while blocking the FETs 169 connected to the plus side connection terminals of the battery 128. Then, as shown by the broken line arrow in FIG. 7, the battery 128 is charged with the generated voltage boosted by the coil 121.
[0081]
  In this power generation control mode, the control unit 162 controls the energization / interruption interval ratio of the FETs 168..., The duty ratio, in accordance with the voltage of the battery 128. That is, when the voltage of the battery 128 is less than the predetermined voltage, the duty ratio is increased to increase the charging current, and when the voltage of the battery 128 is equal to or higher than the predetermined voltage, the duty ratio is decreased to reduce the charging current. The control unit 162 controls the energization / cut-off interval ratio of the FETs 168.
[0082]
  Further, the control unit 162 also controls the energization / interruption interval ratio of the FETs 168. That is, when the throttle is returned or when the throttle opening is fully closed, the duty ratio is increased to increase the amount of power generation, and the control unit 162 causes the FET 168... The ratio is controlled.
[0083]
  Next, the operation of the first embodiment will be described. The power unit P can exhibit the engine E, the transmission means 17 for transmitting the output of the engine E to the rear wheels WR, and the power for assisting the output of the engine. A rotating electric machine 110 that can function as a starter motor and an assist motor is configured as a hybrid type. In such a power unit P, the rotating electric machine 110 is opposite to the transmission means 17 of the crankshaft 27. It is connected to the end of the. That is, the rotating electrical machine 110 is connected to the crankshaft 27 at a position close to the swing fulcrum of the power unit P to the vehicle body frame F, so that the unsprung load of the rear cushion 92 is increased for the hybrid power unit P. Thus, the rotating electric machine 110 does not adversely affect the swing performance of the power unit P, and the riding comfort and steering stability of the motorcycle can be improved.
[0084]
  The operations of the engine E and the rotating electrical machine 110 are controlled by a control unit 162. The control unit 162 stops the engine E when the vehicle is stopped, starts the engine E when the vehicle starts, and functions as an assist motor when the vehicle starts. Since the rotating electrical machine 110 is operated at the same time, the engine E is efficiently operated by preventing wasteful fuel consumption and exhaust gas emission by controlling the engine E stop / start according to the vehicle stop / start. It can be shown. In addition, the vehicle can be started quickly by applying the assist force from the rotating electrical machine 110 to the engine output when the vehicle is accelerated.
[0085]
  Furthermore, since the rotating electrical machine 110 is controlled by the control unit 162 so as to apply a starting torque to the engine E when the engine E is started, the rotating electrical machine 110 is not only used as an assist motor for assisting the output of the engine E. It can also be used as a starter motor.
[0086]
  By the way, the rotating electrical machine 110 constitutes the starter / power generator 18 together with the centrifugal governor 111, and the starter / power generator 18 is located outward from the side end of the rear wheel WR opposite to the transmission case 84. And is connected to the crankshaft 27 of the engine E. Therefore, regardless of the type of the engine E, the starter / power generator 18 is arranged on the outer side of the rear wheel WR, avoiding the design change according to the type of the engine E and the extension of the wheel base, Interference between the starter / power generator 18 and the rear wheel WR can be reliably prevented.
[0087]
  By the way, the engine E is a four-cycle engine, and the length of the cylinder head 22 in the direction along the cylinder axis is larger than that of the two-cycle engine. In a motorcycle equipped with the four-cycle engine E, the wheel base is two cycles. Since the starting torque required for starting the four-cycle engine E is larger than the starting torque of the two-cycle engine, the starting and power generating device 18 must be enlarged. . However, since the starter / power generator 18 is disposed outside the side end of the rear wheel WR opposite to the transmission case 84, the design change according to the type of the engine E and the extension of the wheel base are avoided. Thus, the effect of reliably preventing the interference between the starter / power generator 18 and the rear wheel WR can be obtained more remarkably.
[0088]
  Further, the engine E is mounted on a motorcycle with its cylinder axis being substantially horizontal. In such a motorcycle, the starter / generator 18 avoids a design change according to the type of the engine E and an extension of the wheel base. The effect of reliably preventing the interference of the rear wheel WR can be obtained more remarkably.
[0089]
  In the centrifugal governor 111 in the starter / generator 18, a plurality of weight rollers 142 interposed between the rotating body 140 and the moving body 141 are arranged in the circumferential direction of the surface of the rotating body 140 facing the moving body 141. It accommodates in the accommodating recessed part 146 ... provided in the several places spaced apart, respectively. In addition, the weights of the weight rollers 142 are caused by the centrifugal force acting on the weight rollers 142 when the rotational speed of the engine E is equal to or higher than a predetermined rotational speed smaller than the idle rotational speed. 137, 138... Are set apart from the first conductive path 125, the second conductive path 126, and the commutator pieces 127, and the outer diameters of the weight rollers 142 are relatively small. For this reason, the weight rollers 142 are easily inclined in the receiving recesses 146 due to the slight gap between both ends of the weight roller 142 and the inner side surfaces of the receiving recesses 146. Arc portions 142a... Having an arcuate vertical cross-sectional shape bulging outward are formed on the entire outer periphery of both ends of the weight roller 142. As a result, even if the weight rollers 142 are inclined in the receiving recesses 146 and the outer edges of the both ends of the weight rollers 142 are in contact with the inner surfaces of the receiving recesses 146, the outer peripheral edges of the both ends of the weight rollers 142 are outward. Therefore, the contact surface pressure to the inner surface of the receiving recesses 146 of the weight rollers 142 is relatively low, and the outer edges of both ends of the weight rollers 142 are in contact with the inner surfaces of the receiving recesses. It can be made slippery, and the malfunction of the centrifugal governor 111 due to the lock of the weight rollers 142 can be prevented as much as possible.
[0090]
  Moreover, since the grease 150 is filled in each of the receiving recesses 146, the inner surfaces of the weight rollers 142 and the receiving recesses 146 are lubricated by the grease 150, and the occurrence of malfunction due to the lock of the weight rollers 142 is further increased. It can be effectively prevented.
[0091]
  Further, each housing recess 146 is substantially sealed by a pulsar rotor 151 for detecting the engine speed, which covers the rotating body 140 and the moving body 141 and is fixed to the outer end of the crankshaft 27. The housing recesses 146... Can be sealed without using any parts, and dust can be prevented from entering the grease 150 from the outside to maintain a good lubrication state.
[0092]
  FIG. 15 shows a second embodiment of the present invention, and the coil 121 of the outer stator 113 may be configured in three phases. In this case, the energization control circuit 167 ′ includes the coil 121 of each phase and the battery. Three FETs 168... Interposed between the minus side terminals of 128, three FETs 169... Respectively interposed between the coil 121 of each phase and the plus side terminal of the battery 128, and the FETs 168. These are configured with diodes 170..., 171.
[0093]
  Although the embodiments of the present invention have been described in detail 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. Is possible.
[0094]
  For example, in the above embodiment, the charging voltage of the battery 128 is adjusted by the duty ratio in the power generation control mode. However, a conventional regulator may be used. In this case, each FET 168... 169. It can be used as a rectifier.
[0095]
  In the above embodiment, the starting torque at the start of the engine E, the assist torque at the start of the vehicle, and the generated voltage are obtained by the coil 121 in the outer stator 113. However, the starting torque, the assist torque, and the generated voltage are obtained. These may be obtained by separate coils, or an intermediate tap may be provided on the same coil and used for starting torque, assist torque, and generated voltage.
[0096]
【The invention's effect】
  As described above, claims 1 toEach of 6According to the invention,Regardless of the type of engine, the starter / power generator is disposed outside the rear wheels, and the portion of the stator case that covers the starter / power generator opposite the outer periphery of the starter / power generator is the crankshaft. A crankcase that is disposed so as to overlap a part of the rear wheel in a direction along the axis of the camshaft and that forms a part of the peripheral wall of the cam chain storage chamber disposed between the engine cylinder and the starter / power generator. Arranged so that the portion facing the outer periphery of the drive sprocket is located in front of the rear end of the stator case that covers the starter / power generator and overlaps with a part of the starter / power generator in the direction along the axis of the crankshaft Is done. With the above,The design change according to the type of engine and the extension of the wheel base can be avoided, and the interference between the starter / power generator and the rear wheel can be surely prevented.
[0097]
  And especially claims5According to the invention, it is possible to obtain a more remarkable effect of reliably preventing interference between the starter / power generator and the rear wheel by avoiding the design change according to the type of engine and the extension of the wheel base.
[0098]
  More particularly the claims6According to the invention, it is possible to obtain a more remarkable effect of reliably preventing interference between the starter / power generator and the rear wheel by avoiding the design change according to the type of engine and the extension of the wheel base.
[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 cross-sectional view of the power unit taken along line 2-2 in FIG.
FIG. 3 is an enlarged cross-sectional view of the engine and compressor of FIG.
4 is an enlarged cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is a diagram showing opening and closing timings of an intake valve, an exhaust valve, and a supercharging valve.
6 is an enlarged cross-sectional view of the starter / power generator shown in FIG. 2. FIG.
FIG. 7 is a circuit diagram showing a configuration of an electric circuit related to a commutator of a rotating electrical machine.
FIG. 8 is a circuit diagram showing a connection state of a commutator and each brush.
9 is an enlarged cross-sectional view taken along line 9-9 of FIG.
FIG. 10 is a view showing a state in which the weight roller is inclined in the housing recess.
FIG. 11 is a diagram showing a control system of the engine and the rotating electrical machine.
FIG. 12 is a diagram showing throttle opening, crankshaft rotation speed, and crankshaft output torque at the time of engine start as time elapses.
FIG. 13 is a diagram showing the relationship between motor output, engine speed, and throttle opening when assist torque is applied.
FIG. 14 is a diagram showing throttle opening, crankshaft rotation speed, and crankshaft output torque when assist torque is applied, over time.
FIG. 15 is a circuit diagram corresponding to FIG. 7 of the second embodiment.
[Explanation of symbols]
17 ... Transmission means
18 ... Starting and generating device
20 ... Cylinder block
21 ... Cylinder
22 ... Cylinder head
27 ... Crankshaft
28 ... Crankcase
38 ... Valve camshaft
48 ... driven sprocket
49 ... Drive sprocket
50 ... Cam chain
51 ... Storage room
60: Compressor as auxiliary equipment
84 ... transmission case
112-Inner rotor
113 .. Outer stator
122 .. Stator case
153 ・ ・ Rotational speed sensor
E ... Engine
F ... Body frame
WR ... Rear wheel
P ... Power unit

Claims (6)

An engine (E) disposed in front of the rear wheel (WR), and a transmission case (84) extending to one side of the rear wheel (WR) connected to a crankcase (28) of the engine (E); The rear case (WR) pivotally supported at the rear portion of the transmission case (84) and the one end portion of the crankshaft (27) of the engine (E) are housed in the transmission case (84). The front part of the power unit (P) having the transmission means (17) is swingably supported by the vehicle body frame (F), and the starter / generator (18) is connected to the other end of the crankshaft (27). Motorcycles
The starter / power generator (18) is disposed on the outer side of the rear wheel (WR) opposite to the transmission case (84) and connected to the crankshaft (27), so that the starter A portion of the stator case (122) that covers the cum generator (18) that faces the outer periphery of the starter / generator (18) is one of the rear wheels (WR) in the direction along the axis of the crankshaft (27). It is arranged so as to overlap with parts, wound around the valve operating cam shaft driven sprocket fixed to (38) (48) and said crankshaft drive sprocket fixed to (27) (49) of said engine (E) A storage chamber (51) for storing the endless cam chain (50) is disposed between the cylinder (21) of the engine (E) and the starter / generator (18), and the storage chamber (51). Forms part of the peripheral wall The portion of the crankcase (28) that faces the outer periphery of the drive sprocket (48) is positioned in front of the rear end of the stator case (122), and the axis of the crankshaft (27). A motorcycle that is arranged so as to overlap with a part of the starter / power generator (18) in a direction along the direction . A rotational speed sensor (153) for detecting the rotational speed of the crankshaft (27) is opposed to the outer periphery of the starter / power generator (18) and is arranged along the axis of the crankshaft (27) with the rear wheel ( 2. The motorcycle according to claim 1, wherein the motorcycle is fixedly arranged at a position overlapping with a part of WR) . The starting and power generating device (18) includes an inner rotor (112) and an outer stator (113), and a portion of the cylinder block (20) facing the outer periphery of the drive sprocket (48) is the crankshaft ( 27. The motorcycle according to claim 1 or 2 , wherein the motorcycle is disposed so as to overlap a part of the outer stator (113) in a direction along the axis of 27). A cam chain (50) wound around a driven sprocket (48) fixed to the valve camshaft (38) by an auxiliary machine (60) driven by the valve camshaft (38) provided in the engine (E). The motorcycle according to any one of claims 1 to 3 , wherein the motorcycle is arranged on the same side as the starter / power generator (18).   The motorcycle according to claim 1, wherein the engine (E) is a four-cycle engine. The motorcycle according to claim 5, wherein the engine (E) is mounted with its cylinder axis substantially horizontal.

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