WO2020066879A1 - 鞍乗り型車両のパワーユニット - Google Patents
鞍乗り型車両のパワーユニット Download PDFInfo
- Publication number
- WO2020066879A1 WO2020066879A1 PCT/JP2019/036924 JP2019036924W WO2020066879A1 WO 2020066879 A1 WO2020066879 A1 WO 2020066879A1 JP 2019036924 W JP2019036924 W JP 2019036924W WO 2020066879 A1 WO2020066879 A1 WO 2020066879A1
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- WO
- WIPO (PCT)
- Prior art keywords
- power unit
- saddle
- crankcase
- ride type
- type vehicle
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J23/00—Other protectors specially adapted for cycles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J99/00—Subject matter not provided for in other groups of this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
- B62M7/00—Motorcycles characterised by position of motor or engine
- B62M7/02—Motorcycles characterised by position of motor or engine with engine between front and rear wheels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F7/00—Casings, e.g. crankcases or frames
Definitions
- the present invention relates to an AC generator having a crankcase rotatably supporting a crankshaft, a rotor connected to the crankshaft outside the crankcase, and rotating around the rotation axis of the crankshaft, and covering the crankcase from outside. And a case cover for accommodating the AC generator.
- Patent Document 1 discloses an ACG (alternating current generator) starter that generates power according to rotation of a crankshaft and causes rotation of the crankshaft according to supply of electric current.
- the ACG starter includes a rotor (rotating body) fixed to the crankshaft outside the crankcase and surrounding the stator around the rotation axis.
- An ACG cover (rotating body cover) that surrounds the rotor around the rotation axis and forms a housing space for the rotor is coupled to the crankcase.
- a notch is formed in a peripheral wall surrounding the ACG below a horizontal plane including the rotation axis.
- the notch provides an outside air communication port.
- the cooling air of the ACG flows into the housing space from the front, and then flows out from the outside air communication port.
- the cooling air was directly scattered as warm air from the outside air communication port into the outside air.
- the outside air communication port is disposed in front of the driver's step, the driver's feet have been exposed to warm air.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power unit of a saddle-ride type vehicle that does not require exposing a driver's feet to warm air from an AC generator.
- an AC power generator having a crankcase rotatably supporting a crankshaft, and a rotor connected to the crankshaft outside the crankcase and rotating about a rotation axis of the crankshaft.
- a power unit for a saddle-ride type vehicle comprising: a crankcase; and a case cover that covers the crankcase from the outside and accommodates the AC generator, wherein a peripheral wall surrounding the AC generator is provided between the crankcase and the case cover.
- An exhaust passage extending rearward from a step installed in the vehicle body is formed from the exhaust port defined in the vehicle.
- the power unit is rotatably supported on the crankcase behind the crankshaft around an axis parallel to the rotation axis, and is provided via a transmission.
- An output shaft that outputs the rotational force of the crankshaft at an arbitrary reduction ratio, and is fixed to the output shaft outside the crankcase, and is covered by the case cover at the rear of the alternator;
- a sprocket that transmits the rotational force of the output shaft to the rear wheel through the case cover, wherein the case cover covers the AC generator and has a generator cover having the peripheral wall, and the case cover is disposed behind the generator cover.
- a sprocket cover that covers the sprocket and has a partition wall that partitions the exhaust passage from a space that houses the sprocket.
- the exhaust passage extends rearward of the vehicle body at a position below the sprocket.
- the exhaust passage is coaxial with the rotor and extends along a tangential direction of a cylindrical surface surrounding the rotor. It extends downstream in the direction of rotation.
- the outlet of the exhaust passage is located behind the step and lower than a tandem step installed on the vehicle body.
- the exhaust passage is inclined so as to decrease toward the ground toward the rear of the vehicle body.
- the AC generator functions as a starter that generates a driving force that causes the crankshaft to rotate when the vehicle starts.
- the rotor is provided with a blade that generates an airflow in a centrifugal direction when the rotor rotates.
- the case cover is made of resin.
- the case cover contacts the crankcase with a mating surface formed by a plane orthogonal to the rotation axis, and A water blocking wall protruding from an outer periphery of the mating surface and covering an outer surface of the crankcase;
- the water blocking wall is disposed forward and above the rotation axis.
- the outlet of the exhaust passage is fixed to an engine hanger formed in the crankcase and connected to a vehicle body frame. Facing the connecting device to be connected.
- the cooling wind of the AC generator flows out of the air outlet opening in the peripheral wall surrounding the AC generator, and is guided to the rear of the step along the exhaust air passage. Since the warm air is discharged from behind the steps, the path of the warm air can avoid the driver's feet. The driver's feet need not be exposed to the warm air from the alternator.
- the degree of freedom of the shapes of the generator cover and the sprocket cover in molding is increased.
- the degree of freedom in the arrangement of the exhaust passage can be increased.
- the partition wall of the sprocket cover prevents the exhaust air from entering the sprocket, the sprocket can be protected from the accumulation of dust contained in the exhaust air.
- the exhaust air can be exhausted downward as far as possible. Therefore, the influence of the exhaust air on the occupant can be avoided as much as possible.
- the exhaust air passage extends along the direction of the air pushed out by the rotation of the rotor, so that the exhaust air can be efficiently introduced from the storage space of the rotor into the exhaust air passage.
- the exhaust air is exhausted from a position lower than the feet of the tandem occupant mounted on the tandem step, the effect of the exhaust air on the feet of the tandem occupant is suppressed (or avoided).
- the exhaust air since the exhaust air has directivity backward and downward, the influence of the exhaust air on the driver and the tandem occupant can be suppressed (avoided).
- the AC generator since the AC generator also functions as a starter, the AC generator easily has heat as compared with a case having only a power generation function. Even in such a case, since the AC generator is effectively cooled by the function of the exhaust passage, heat generation of the AC generator can be effectively suppressed.
- the cooling air can efficiently flow into the accommodating space of the AC generator. Heat generation of the AC generator can be effectively suppressed.
- the case cover since the case cover is made of a resin, the case cover generally has a lower thermal conductivity than that of a metal case cover, and it is possible to effectively prevent the case cover from becoming hot. it can. Moreover, since the resin case cover is lighter than the metal case cover, the resin case cover can contribute to the weight reduction of the vehicle.
- the accommodating space of the AC generator when the accommodating space of the AC generator is flooded, water sprinkled in the centrifugal direction from the rotor enters between the crankcase and the case cover at the mating surface. At this time, since the water traveling along the mating surface is blocked by the water blocking wall, it is possible to prevent the water from splattering outward from the mating surface toward the occupant.
- water is prevented from being scattered around the case cover in front of and above the rotation axis, but effectively behind the mating surface of the crankcase and the case cover behind and below the rotation axis. Can leak out. Thus, drainage from the accommodating space of the alternator can be promoted.
- an obstacle is opposed to the outlet of the air discharge passage, so that entry of dust into the air discharge passage can be suppressed.
- FIG. 1 is a side view schematically showing an overall image of a motorcycle (saddle-ride type vehicle) according to one embodiment of the present invention.
- FIG. 2 is a front view of the motorcycle.
- FIG. 3 is a cross-sectional view of the power unit observed on a cutting plane including the cylinder axis, the rotation axis of the crankshaft, the axis of the main shaft, and the axis of the counter shaft.
- FIG. 4 is an enlarged left side view of the power unit.
- FIG. 5 is an enlarged vertical sectional view taken along line 5-5 in FIG.
- FIG. 6 is an enlarged left side view of the power unit observed when the outer member is removed from the inner member.
- FIG. 7 is an enlarged sectional view taken along line 7-7 of FIG. FIG.
- FIG. 8 is an enlarged left side view of the power unit observed when an AC generator (ACG) cover is removed.
- FIG. 9 is an enlarged perspective view schematically showing an entire image of the inner member of the ACG cover from a diagonally upper viewpoint.
- FIG. 1 schematically shows an overall image of a motorcycle which is a saddle-ride type vehicle according to an embodiment of the present invention.
- the motorcycle 11 includes a body frame 12 and a body cover 13 attached to the body frame 12.
- the vehicle body cover 13 has a tank cover 16 that covers the fuel tank 14 and is connected to an occupant seat 15 behind the fuel tank 14. Fuel is stored in the fuel tank 14. The occupant straddles the occupant seat 15 when driving the motorcycle 11.
- a tandem occupant hereinafter referred to as a “tandem occupant” can be seated on the occupant seat 15.
- the vehicle body frame 12 includes a head pipe 17, a main frame 19 extending rearward and downward from the head pipe 17 and having a pivot frame 18 at a rear lower end, and a down frame extending downward from the head pipe 19 at a position below the main frame 19. 21, left and right seat frames 22 extending rearward in the horizontal direction from a curved area 19 a of the main frame 19, extending rearward upward from the pivot frame 18 below the seat frames 22, and coupled to the seat frames 22 from below at rear ends. And a rear frame 23.
- the rear frame 23 supports the seat frame 22 from below.
- a front fork 24 is supported on the head pipe 14 so as to be steerable.
- a front wheel WF is supported by the front fork 24 so as to be rotatable around an axle 25.
- a steering handle 26 is connected to an upper end of the front fork 24. As shown in FIG. 2, the steering handle 26 extends left and right in the vehicle width direction in parallel with the ground. Handle grips 27 are fixed to both ends of the steering handle 26. The driver grips the handle grips 27 with the left and right hands when driving the motorcycle 11.
- a swing arm 29 is connected to the body frame 12 behind the vehicle so as to swing up and down around a pivot 28.
- a rear wheel WR is supported at the rear end of the swing arm 29 so as to be rotatable around the axle 31.
- a power unit 32 that generates a driving force transmitted to the rear wheel WR is mounted on the body frame 12 between the front wheel WF and the rear wheel WR. The power of the power unit 32 is transmitted to the rear wheel WR via the power transmission device 33.
- the motorcycle 11 is provided with a pair of steps 34 disposed on the left and right sides of the power unit 32 in front of the pivot frame 18, and is disposed behind the step 34 and disposed on the left and right sides of the rear wheel WR in front of the axle 31. And a pair of tandem steps 35 performed.
- the steps 34 are fixed to both ends of a rod 36 attached to the engine 32 from below and extending in the vehicle width direction.
- the tandem steps 35 extend rearward from the pivots 28, bend upward on the sides of the rear wheel WR, and are fixed to brackets 37 connected to the rear frame 23 at the upper ends, respectively.
- the driver can put his foot on step 34 while straddling the occupant seat 15.
- the tandem occupant can rest his foot on the tandem step 35 over the occupant seat 15 behind the driver.
- the power unit 32 is disposed between the down frame 21 and the main frame 19, and is connected to the down frame 21 and the main frame 19, respectively, and a cylinder extending upward from the front side of the crank case 38 and tilting forward.
- a cylinder block 39 having an axis C, a cylinder head 41 coupled to an upper end of the cylinder block 39 to support a valve operating mechanism, and coupled to an upper end of the cylinder head 41 to cover the valve operating mechanism on the cylinder head 41.
- a head cover 42 a head cover 42.
- the crankcase 38 is formed with two upper and lower engine hangers 43a projecting forward from the front side and two upper and lower engine hangers 43b and 43c projecting rearward from the rear side.
- the front engine hanger 43a is connected to the down frame 21 by a connector 44a such as a bolt and nut.
- the rear engine hangers 43b and 43c are connected to the pivot frame 18 by connecting members 44b and 44c such as bolts and nuts.
- power is generated around the rotation axis Rx.
- a left case cover 45 that accommodates an alternating current generator (ACG) starter and a sprocket, which will be described later, is coupled to the crankcase 38.
- ACG alternating current generator
- the cylinder block 39 defines a cylinder 48 for guiding the linear reciprocating motion of the piston 47 along the cylinder axis C.
- a single cylinder 48 that receives a single piston 47 is formed in the cylinder block 39.
- a combustion chamber 49 is defined between the piston 47 and the cylinder head 41.
- a spark plug 51 facing the combustion chamber 49 is attached to the cylinder head 41.
- the air-fuel mixture is introduced into the combustion chamber 49 by the action of an intake valve and an exhaust valve that open and close according to the rotation of the camshaft 52, and the exhaust gas after combustion is exhausted from the combustion chamber 49.
- the crankcase 38 is divided into a first case half 38a and a second case half 38b.
- the first case half 38a and the second case half 38b face each other on their inner surfaces.
- the first case half 38a and the second case half 38b are connected to each other in a liquid-tight manner at the mating surfaces to cooperate to define the crank chamber 53.
- the left case cover 45 is coupled to an outer surface of the first case half 38a, and an ACG cover (rotating body cover) 55 for accommodating the ACG starter 54 between the first case half 38a and the first case half.
- a sprocket cover 57 for receiving the sprocket 56 between the first case half 38a and the outer case 38a.
- the ACG cover 55 and the sprocket cover 57 are disposed inside a virtual plane VP that connects the tip of the step 34, the tip of the handle grip 27, and the ground point of the front wheel WF when inverted.
- a clutch cover 59 for accommodating a friction clutch 58 described later is coupled between the outer surface of the second case half body 38b and the second case half body 38b.
- the crankshaft 61 is arranged between journals 64a, 64b connected to ball bearings 62, 63 fitted into the first case half 38a and the second case half 38b, respectively, and the journals 64a, 64b. And a crank 65 housed in the crank 53.
- the crank 65 has a crank web 66 integrated with the journals 64a and 64b, and a crank pin 67 connecting the crank webs 66 to each other.
- the axes of the journals 64a, 64b coincide with the rotation axis Rx.
- a large end of a connecting rod 68 extending from the piston 47 is rotatably connected to the crank pin 67.
- the connecting rod 68 converts a linear reciprocating motion of the piston 47 into a rotary motion of the crankshaft 61.
- An ACG starter 54 is connected to one end of a crankshaft 61 projecting outward from the crankcase 38 in one direction.
- the ACG starter 54 includes a stator 71 fixed to the outer surface of the crankcase 38, and a rotor (rotating body) 72 that is non-rotatably coupled to one end of the crankshaft 61 protruding from the crankcase 38.
- the stator 71 has a plurality of coils 71a arranged in a circumferential direction around the crankshaft 61 and wound around a stator core.
- the rotor 72 has a plurality of magnets 72a arranged in a circumferential direction along an annular orbit surrounding the stator 71.
- the magnet 72a When the crankshaft 61 rotates, the magnet 72a is displaced relative to the coil 71a, and the ACG starter 54 generates power. Conversely, when a current flows through the coil 71a, a magnetic field is generated in the coil 71a, causing rotation of the crankshaft 61.
- the rotor 72 is provided with a blade 72b that draws air in the axial direction during rotation and generates an airflow in the accommodation space in the centrifugal direction.
- the power unit 32 includes a dog clutch type transmission 73 combined with the crankshaft 61.
- the transmission 73 is accommodated in a transmission room 74 that is continuously partitioned from the crankcase 53 in the crankcase 38.
- the transmission 73 includes a main shaft 75 having an axis parallel to the axis of the crankshaft 61 and a counter shaft (output shaft) 76.
- the main shaft 75 and the counter shaft 76 are rotatably supported by the crankcase 38 by rolling bearings.
- a plurality of transmission gears 77 are supported on the main shaft 75 and the counter shaft 76.
- the transmission gear 77 is disposed between the rolling bearings and housed in the transmission room 74.
- the transmission gear 77 includes a rotating gear 77a coaxially and rotatably supported on the main shaft 75 or the counter shaft 76, and a fixed gear 77b fixed to the main shaft 75 so as to be relatively non-rotatable and meshing with the corresponding rotating gear 77a.
- a shift gear 77c supported by the main shaft 75 or the counter shaft 76 so as to be relatively non-rotatable and axially displaceable and mesh with the corresponding rotary gear 77a.
- the axial displacement of the rotating gear 77a and the fixed gear 77b is restricted.
- the shift gear 77c is connected to the rotary gear 77a through the axial displacement, the relative rotation between the rotary gear 77a and the main shaft 75 or the counter shaft 76 is restricted.
- the shift gear 77c meshes with the fixed gear 77b of the other shaft, rotational power is transmitted between the main shaft 75 and the counter shaft 76.
- the shift gear 77c is connected to the rotating gear 77a that meshes with the fixed gear 77b of the other shaft, rotational power is transmitted between the main shaft 75 and the counter shaft 76.
- the counter shaft 76 outputs the torque of the crank shaft 61 at an arbitrary reduction ratio via the transmission 73.
- the main shaft 75 is connected to the crankshaft 61 through a primary reduction mechanism 78 housed between the crankcase 38 and the clutch cover 59 outside the crankcase 38.
- the primary reduction mechanism 78 includes a power transmission gear 78a and a driven gear 78b supported on the main shaft 75 so as to be relatively rotatable.
- the power transmission gear 78a is fixed to the other end of the crankshaft 61 projecting outward from the crankcase 38.
- the driven gear 78b meshes with the power transmission gear 78a.
- the friction clutch 58 housed between the crankcase 38 and the clutch cover 52 is connected to the main shaft 75.
- the friction clutch 58 includes a clutch outer 58a and a clutch hub 58b.
- the driven gear 78b of the primary reduction mechanism 78 is connected to the clutch outer 58a.
- connection and disconnection are switched between the clutch outer 58a and the clutch hub 58b according to the operation of the clutch lever.
- the sprocket 56 is fixed to the counter shaft 76.
- the power transmission device 33 includes a sprocket 56, a driven sprocket fixed to the axle 31 of the rear wheel WR, and a winding chain 79 wound around the sprocket 56 and the driven sprocket.
- the sprocket 56 transmits the rotational force of the counter shaft 76 to the rear wheel WR via the wrapping chain 79.
- the ACG cover 55 accommodates the inner peripheral wall 81a surrounding the rotor 72 of the ACG starter 54 around the rotation axis Rx, and the ACG starter 54 around the rotation axis Rx outside the rotor 72 of the ACG starter 54 in the axial direction of the rotation axis Rx.
- an outer peripheral wall 81b surrounding the space.
- the inner peripheral wall 81a and the outer peripheral wall 81b are formed in a cylindrical shape that draws a circle coaxially with the rotation axis Rx.
- the outer peripheral wall 81b has a wall 82 that is continuous over the entire circumference around the rotation axis Rx.
- the ACG cover 55 is provided with a mounting boss 84 that is disposed radially outside the inner peripheral wall 81a, overlaps the outer surface of the crankcase 38, and is fastened to the crankcase 38 with bolts 83.
- the ACG cover 55 is connected to the sprocket cover 57 by a box-shaped expansion body 85 extending rearward from the inner peripheral wall 81a.
- a recess 87 is formed in the sprocket cover 57 at a position above and below the sprocket 56 for accommodating a screw 86 for fastening the sprocket cover 57 to the crankcase 38.
- the bottom plate of the recess 87 is placed on the outer surface of the crankcase 38 and receives the head of a screw 86 screwed into the crankcase 38.
- the outer peripheral wall 81b is provided with a wind guide port 87 for introducing outside air in the radial direction.
- the air guide port 87 is disposed below the horizontal plane HP including the rotation axis Rx.
- a rectifying plate 88a that is arranged at the air guide opening 87 and extends radially with respect to the rotation axis Rx is formed.
- the current plates 88a are arranged at equal intervals around the rotation axis Rx.
- the ACG cover 55 has an attachment boss 84 (see FIG. 4), is fixed to the crankcase 38, and has an inner member (first body) 55a forming an inner peripheral wall 81a; An outer member (second body) 55b having an outer peripheral wall 81b coupled to the outer member 55b; The outer member 55b covers the inner member 55a outside the rotor 72 in the axial direction of the rotation axis Rx.
- a mesh-like partition 89 is formed on the inner member 55a to separate the space surrounded by the inner member 55a from the space surrounded by the outer peripheral wall 81b.
- the partition 89 draws a linear body 89 a extending radially from the outer edge of the opening 91 having a circular contour toward the rotation axis Rx, and a circle concentrically with the circular shape of the opening 91.
- a circular body 89b that connects the first and second parts 89a.
- the size of the mesh may be set to, for example, about 1.5 to 3.0 cm square.
- a plurality of projections 92 are formed on the inner surface of the outer member 55b and project toward the partition 89 above a horizontal plane HP including the rotation axis Rx.
- the protrusion 92 is formed of, for example, a rod having an axis parallel to the rotation axis Rx.
- the protrusions 92 are arranged, for example, along an arc drawn concentrically with the rotation axis Rx.
- the inner member 55a is formed of a material having higher rigidity than the outer member 55b.
- both the inner member 55a and the outer member 55b are molded from a resin material.
- the inner member 55a is molded from, for example, polyamide 66 (PA66 resin).
- the outer member 55b is molded from, for example, polypropylene (PP resin).
- the inner member 55a is surrounded by the wall body 82 of the outer peripheral wall 55b, and has a connection end 93 that is reduced in the radial direction toward the distal end.
- the connection end 93 has a first wall 93a radially contracting toward the front end facing the outer peripheral wall 81b, a second wall 93b extending from the front end of the first wall 93a toward the rotation axis Rx, and a second wall 93b.
- a third wall 93c extending toward the crankcase 38 from the inside and forming a space with the first wall 93a.
- An opening 91 is defined inside the third wall 93c.
- the inner peripheral wall 81a, the first wall 93a, the second wall 93b, and the third wall 93c are continuous with a uniform wall thickness.
- one or more engagement mechanisms 94 that engage with each other are arranged between the connection end 93 and the outer member 55b.
- the engagement mechanism 94 is formed at the connection end 93 and extends in the radial direction with two grooves 94 a, and is formed in the outer member 55 b. And two entering plate pieces 94b.
- the grooves 94a are arranged at intervals of less than 120 degrees around the rotation axis Rx.
- the grooves 94a may be arranged at intervals other than equal intervals in the circumferential direction, for example.
- the grooves 94a are arranged at intervals other than equal intervals, the correspondence between the grooves 94a and the plate pieces 94b is reliably determined, so that the outer member 55b is erroneously attached to the inner member 55a at a prescribed angular position around the rotation axis Rx. Can be stacked.
- a groove may be formed in the outer member 55b and a plate piece may be formed in the inner member 55a.
- a boss 96 into which a screw 95 that passes through the inner member 55a from the inside of the inner member 55a is formed on the outer member 55b.
- the boss 96 enters the recess 93d defined by the connection end 93 from the outside in the axial direction, and is received at the tip by the bottom plate of the recess 93d.
- the screw 95 fastens the boss 96 to the bottom plate of the recess 93d.
- the screw 95 has an axis parallel to the rotation axis Rx.
- the bosses 96 are arranged at equal intervals of 120 degrees around the rotation axis Rx.
- a gap is formed between the edge (end face) of the wall 82 and the inner member 55a.
- the head of the screw 95 faces the surface 72c of the rotor 72 that is continuous around the rotation axis Rx outside the cylindrical surface circumscribing the blade 72b.
- the blade 72b is formed as a member having a smaller diameter than the surface 72c and fastened to the rotor 72 in a recess inside the surface 72c.
- a partition wall 97 is formed which extends vertically between the space for accommodating the ACG starter 54 and the space covered by the sprocket cover 57 and separates them.
- An exhaust port 98 is formed at the lower end of the partition wall 97.
- the sprocket cover 57 defines an exhaust passage 99 extending from the exhaust port 98 at a predetermined length between the sprocket cover 57 and the outer surface of the crankcase 38.
- the sprocket cover 57 has a partition wall 101 that divides the exhaust passage 99 from a space that accommodates the sprocket 56.
- An exhaust passage 99 is defined between the partition wall 101 and the outer wall 102.
- the exhaust passage 99 extends downstream in the rotation direction of the rotor 54 along the tangential direction of the virtual cylindrical surface surrounding the rotor 54 coaxially with the rotor 54.
- the exhaust passage 99 extends rearward of the vehicle body at a position below the sprocket 56.
- the exhaust passage 99 is inclined so as to decrease toward the ground as it goes rearward of the vehicle body.
- the outlet 99a of the exhaust passage 99 faces a connecting member 44c fixed to the engine hanger 43c.
- the outer wall of the sprocket cover 57 facing the partition wall 101 is turned upward toward the partition wall 101. The turning back can prevent foreign matter from entering the exhaust passage 99 from below.
- the outer wall of the ACG cover 55 overlaps the outer wall of the sprocket cover 57 from above.
- the outlet 99 a of the exhaust passage 99 is disposed behind the step 34.
- the outlet 99a of the exhaust passage 99 is located at a position lower than the horizontal plane ZP circumscribing the tandem step 35 from below.
- the inner member 55a of the ACG cover 55 comes into contact with the crankcase 38 at a mating surface 103 formed by a plane orthogonal to the rotation axis Rx.
- the inner member 55 a has a water blocking wall 104 that protrudes from the outer periphery of the mating surface 103 and covers the outer surface of the crankcase 38.
- the water stop wall 104 is disposed forward and above the rotation axis Rx.
- the water stop wall 104 continues from the upper end of the partition wall 97 forward along the mating surface 103 and is interrupted at a position lower than the horizontal plane HP including the rotation axis Rx (see FIG. 6).
- the blades 72b generate airflow in the centrifugal direction according to the rotation of the rotor 72.
- the outside air flows into the accommodating space of the ACG starter 54 in a radial direction from the air guide port 87 of the outer member 55b along the second wall 93b of the connection end 93.
- the outside air advances toward the rotor 72 in the axial direction of the rotation axis Rx in the accommodation space. Since the flow path of the outside air is non-linear, the flow of foreign matter toward the rotor 72 can be suppressed.
- Outside air flows into the inner space of the inner member 55a from the opening 91. The outside air cools the ACG starter 54 in the accommodation space of the ACG starter 54.
- the left case cover 45 covers the ACG starter 54 and has the ACG cover 55 having the peripheral walls 81a and 81b, and is disposed behind the ACG cover 55 to cover the sprocket 56 and accommodate the sprocket 56. And a sprocket cover 57 having a partition wall 101 for partitioning the exhaust passage 99 from the space.
- the left case cover 45 is formed by the ACG cover 55 and the sprocket cover 57, the degree of freedom of the shapes of the ACG cover 55 and the sprocket cover 57 is increased in molding. As a result, the degree of freedom in the arrangement of the exhaust passage 99 is increased.
- the partition wall 101 of the sprocket cover 57 prevents the exhaust air from entering the sprocket 56, the sprocket 56 can be protected from the accumulation of dust contained in the exhaust air.
- the exhaust passage 99 extends rearward of the vehicle body at a position below the sprocket 56.
- the exhaust air is exhausted downward as far as possible. Therefore, the effect of the exhaust air on the occupant is avoided as much as possible.
- the exhaust passage 99 extends downstream in the rotation direction DR of the rotor 72 along the tangential direction of the cylindrical surface surrounding the rotor 72 coaxially with the rotor 72. Since the air discharge passage 99 extends along the direction of the air pushed out by the rotation of the rotor 72, the exhaust air is efficiently introduced from the storage space of the rotor 72 into the air discharge passage 99.
- the exit 99a of the exhaust passage 99 is located at a position lower than the tandem step 35 installed on the vehicle body behind the step 34. Since the exhaust air is exhausted from a position lower than the feet of the tandem occupant mounted on the tandem step 35, the influence of the exhaust air on the feet of the tandem occupant is suppressed (or avoided).
- the exhaust passage 99 is inclined so as to decrease toward the ground as it goes rearward of the vehicle body. Since the exhaust air has a directivity backward and downward, the influence of the exhaust air on the driver and the tandem occupant is suppressed (avoided).
- the ACG starter 54 generates a driving force that causes the crankshaft 61 to rotate when the vehicle starts. Since the alternator also functions as a starter in this way, it is easier for the alternator to have heat than a case having only a power generation function. Even in such a case, since the ACG starter 54 is effectively cooled by the function of the exhaust passage 99, the heat generation of the ACG starter 54 is effectively suppressed.
- the rotor 72 of the ACG starter 54 is provided with a blade 72b that generates an airflow in the centrifugal direction when the rotor 72 rotates. Since an air current is generated in accordance with the rotation of the blade 72 b, the cooling air efficiently flows into the storage space of the ACG starter 54. Heat generation of the ACG starter 54 is effectively suppressed.
- the left case cover 45 is made of resin. Since the left case cover 45 is made of resin, the left case cover 45 generally has a lower heat conduction coefficient than a metal case cover, and the temperature rise of the case cover is effectively suppressed. In addition, since the resin left case cover 45 is lighter than the metal case cover, the resin left case cover 45 can contribute to the weight reduction of the vehicle.
- the left case cover 45 has a water stop wall 104 that comes into contact with the crankcase 38 at a mating surface 103 formed by a plane orthogonal to the rotation axis Rx, protrudes from the outer periphery of the mating surface 103, and covers the outer surface of the crankcase 38.
- a water stop wall 104 that comes into contact with the crankcase 38 at a mating surface 103 formed by a plane orthogonal to the rotation axis Rx, protrudes from the outer periphery of the mating surface 103, and covers the outer surface of the crankcase 38.
- the water blocking wall 104 is disposed forward and above the rotation axis Rx. Spraying of water around the left case cover 45 is prevented before and above the rotation axis Rx, but effectively from the mating surface 103 of the crankcase 38 and the left case cover 45 behind and below the rotation axis Rx. Water can leak. In this way, drainage from the storage space of the ACG starter 54 is promoted.
- the outlet 99a of the exhaust passage 99 faces a connecting member 44c formed on the crankcase 38 and fixed to the engine hanger 43c connected to the vehicle body frame 12 of the vehicle. Since an obstacle faces the outlet 99a of the exhaust passage 99, entry of dust into the exhaust passage 99 is suppressed.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
Description
12…車体フレーム
32…パワーユニット
34…ステップ
35…タンデムステップ
38…クランクケース
43c…エンジンハンガー
44c…連結具
45…ケースカバー(左ケースカバー)
54…交流発電機(ACG)スターター
55…発電機カバー(ACGカバー)
56…スプロケット
57…スプロケットカバー
61…クランク軸
72…ローター
72b…羽根
73…変速機
76…出力軸(カウンター軸)
79…巻き掛けチェーン
81a…周壁(内側周壁)
98…排風口
99…排風通路
99a…出口
101…仕切り壁
103…合わせ面
104…止水壁
Rx…(クランク軸)の回転軸線
WR…後輪
Claims (12)
- 回転自在にクランク軸(61)を支持するクランクケース(38)と、
前記クランクケース(38)の外側で前記クランク軸(61)に連結され、前記クランク軸(61)の回転軸線(Rx)回りで回転するローター(72)を有する交流発電機(54)と、
前記クランクケース(38)に外側から被さって前記交流発電機(54)を収容するケースカバー(45)と、
を備える鞍乗り型車両のパワーユニット(32)において、
前記クランクケース(38)と前記ケースカバー(45)との間に、前記交流発電機(54)を囲む周壁(81a)に区画される排風口(98)から、車体に設置されるステップ(34)よりも後方に延びる排風通路(99)が形成される
ことを特徴とする鞍乗り型車両のパワーユニット。 - 請求項1に記載の鞍乗り型車両のパワーユニットにおいて、
記クランク軸(61)の後方で前記回転軸線(Rx)に平行な軸心回りで回転自在に前記クランクケース(38)に支持され、変速機(73)を介して任意の減速比で前記クランク軸(61)の回転力を出力する出力軸(76)と、前記クランクケース(38)の外側で前記出力軸(76)に固定されて、前記交流発電機(54)の後方で前記ケースカバー(45)に覆われ、巻き掛けチェーン(79)を介して後輪(WR)に前記出力軸(76)の回転力を伝達するスプロケット(56)とを備え、
前記ケースカバー(45)は、前記交流発電機(54)を覆って前記周壁(81a)を有する発電機カバー(55)と、前記発電機カバー(55)の後方に配置され前記スプロケット(56)を覆い、前記スプロケット(56)を収容する空間から前記排風通路(99)を仕切る仕切り壁(101)を有するスプロケットカバー(57)とを有することを特徴とする鞍乗り型車両のパワーユニット。 - 請求項1または2に記載の鞍乗り型車両のパワーユニットにおいて、前記排風通路(99)は、前記スプロケット(56)の下方位置で車体後方に向かって延びることを特徴とする鞍乗り型車両のパワーユニット。
- 請求項1~3のいずれか1項に記載の鞍乗り型車両のパワーユニットにおいて、前記排風通路(99)は、前記ローター(72)に同軸に前記ローター(72)を囲む円筒面の接線方向に沿って、前記ローター(72)の回転方向に下流に向かって延びることを特徴とする鞍乗り型車両のパワーユニット。
- 請求項4に記載の鞍乗り型車両のパワーユニットにおいて、前記排風通路(99)の出口(99a)は、前記ステップ(34)よりも後方で前記車体に設置されるタンデムステップ(35)よりも低い位置に位置することを特徴とする鞍乗り型車両のパワーユニット。
- 請求項5に記載の鞍乗り型車両のパワーユニットにおいて、前記排風通路(99)は、車体後方にいくにつれて地面に向かって低下するように傾斜することを特徴とする鞍乗り型車両のパワーユニット。
- 請求項1~6のいずれか1項に記載の鞍乗り型車両のパワーユニットにおいて、前記交流発電機(54)は、車両の始動時に前記クランク軸(61)の回転を引き起こす駆動力を生成するスターターとして機能することを特徴とする鞍乗り型車両のパワーユニット。
- 請求項1~7のいずれか1項に記載の鞍乗り型車両のパワーユニットにおいて、前記ローター(72)には、前記ローター(72)の回転時に遠心方向に気流を生成する羽根(72b)が取り付けられることを特徴とする鞍乗り型車両のパワーユニット。
- 請求項1~8のいずれか1項に記載の鞍乗り型車両のパワーユニットにおいて、前記ケースカバー(45)は樹脂製であることを特徴とする鞍乗り型車両のパワーユニット。
- 請求項1~9のいずれか1項に記載の鞍乗り型車両のパワーユニットにおいて、前記ケースカバー(45)は、前記回転軸線(Rx)に直交する平面で形成される合わせ面(103)で前記クランクケース(38)に接触し、前記合わせ面(103)の外周から突出して前記クランクケース(38)の外面に被さる止水壁(104)を有することを特徴とする鞍乗り型車両のパワーユニット。
- 請求項10に記載の鞍乗り型車両のパワーユニットにおいて、前記止水壁(104)は前記回転軸線(Rx)よりも前方および上方に配置されることを特徴とする鞍乗り型車両のパワーユニット。
- 請求項1~11のいずれか1項に記載の鞍乗り型車両のパワーユニットにおいて、前記排風通路(99)の出口(99a)は、前記クランクケース(38)に形成されて車両の車体フレーム(12)に連結されるエンジンハンガー(43c)に固定される連結具(44c)に向き合わせられることを特徴とする鞍乗り型車両のパワーユニット。
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JP2020549112A JP7130053B2 (ja) | 2018-09-25 | 2019-09-20 | 鞍乗り型車両のパワーユニット |
BR112021003673-3A BR112021003673A2 (pt) | 2018-09-25 | 2019-09-20 | unidade de potência para veículo de montar em selim |
CN201980062044.8A CN112739615B (zh) | 2018-09-25 | 2019-09-20 | 鞍乘型车辆的动力单元 |
PH12021550618A PH12021550618A1 (en) | 2018-09-25 | 2021-03-18 | Power unit for straddle-type vehicles |
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