WO2017033615A1 - 鞍乗型車両のパワーユニット - Google Patents
鞍乗型車両のパワーユニット Download PDFInfo
- Publication number
- WO2017033615A1 WO2017033615A1 PCT/JP2016/070969 JP2016070969W WO2017033615A1 WO 2017033615 A1 WO2017033615 A1 WO 2017033615A1 JP 2016070969 W JP2016070969 W JP 2016070969W WO 2017033615 A1 WO2017033615 A1 WO 2017033615A1
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- WO
- WIPO (PCT)
- Prior art keywords
- transmission case
- cover
- duct cover
- power unit
- case cover
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K17/00—Arrangement or mounting of transmissions in vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62H—CYCLE STANDS; SUPPORTS OR HOLDERS FOR PARKING OR STORING CYCLES; APPLIANCES PREVENTING OR INDICATING UNAUTHORIZED USE OR THEFT OF CYCLES; LOCKS INTEGRAL WITH CYCLES; DEVICES FOR LEARNING TO RIDE CYCLES
- B62H1/00—Supports or stands forming part of or attached to cycles
- B62H1/02—Articulated stands, e.g. in the shape of hinged arms
-
- 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
- B62J13/00—Guards for chain, chain drive or equivalent drive, e.g. belt drive
- B62J13/04—Guards for chain, chain drive or equivalent drive, e.g. belt drive completely enclosing the chain drive or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K25/00—Axle suspensions
- B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
- B62K25/28—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay
- B62K25/283—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay for cycles without a pedal crank, e.g. motorcycles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K25/00—Axle suspensions
- B62K25/04—Axle suspensions for mounting axles resiliently on cycle frame or fork
- B62K25/28—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay
- B62K25/32—Axle suspensions for mounting axles resiliently on cycle frame or fork with pivoted chain-stay the chain-stay forming a chain-guard
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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
- B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
- B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
- B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
- B62M9/08—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving eccentrically- mounted or elliptically-shaped driving or driven wheel; with expansible driving or driven wheel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
- F16H57/0415—Air cooling or ventilation; Heat exchangers; Thermal insulations
- F16H57/0416—Air cooling or ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/048—Type of gearings to be lubricated, cooled or heated
- F16H57/0487—Friction gearings
- F16H57/0489—Friction gearings with endless flexible members, e.g. belt CVTs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- B60Y2200/00—Type of vehicle
- B60Y2200/10—Road Vehicles
- B60Y2200/12—Motorcycles, Trikes; Quads; Scooters
- B60Y2200/126—Scooters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62K—CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDE-CARS, FORECARS, OR THE LIKE
- B62K2202/00—Motorised scooters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H2057/02039—Gearboxes for particular applications
- F16H2057/02043—Gearboxes for particular applications for vehicle transmissions
- F16H2057/02065—Gearboxes for particular applications for vehicle transmissions for motorcycles or squads
Definitions
- the present invention relates to a power unit for a saddle riding type vehicle.
- the power unit mounted on the saddle-ride type vehicle includes a transmission case that is connected to a crankcase that supports the crankshaft of the internal combustion engine and extends to the side of the rear wheel, and a side of the transmission case in the vehicle width direction. It is known that a belt-type continuously variable transmission is accommodated inside a transmission case cover that covers the belt-type continuously variable transmission. In the belt chamber that houses the belt type continuously variable transmission of the power unit, cooling air is introduced from a cooling air introduction port formed in the front portion of the transmission case cover to cool the belt type continuously variable transmission.
- the front part of the metal transmission case cover including the cooling air introduction port is covered with the air guide duct cover, but has a relatively large surface area that is not covered by the air guide duct cover other than the front part of the transmission case cover.
- the belt inside the belt chamber is cooled by the cooling air introduced from the cooling air introduction port into the belt chamber because the transmission case cover is efficiently cooled by heat extraction that is exposed to the outside and exposed to the traveling wind. Cooling of the continuously variable transmission can be further promoted.
- the main stand pivotally supported at the lower part of the crankcase is located between a standing position that supports the vehicle body when parked and a retracted position that lies down along the lower surface of the transmission case when traveling.
- Is generally provided to swing see, for example, Patent Document 1).
- Patent Document 1 discloses a straddle-type vehicle in a state where a main stand is raised and a vehicle body is supported (see FIG. 1 of Patent Document 1).
- an operation arm that protrudes outward in the vehicle width direction extends from the leg portion that stands upright and supports the vehicle body while being curved. Since the air duct cover covers only the front part of the transmission case cover, if the main stand swings from the standing state to the retracted state and the legs fall down along the lower surface of the transmission case, The extending operating arm extends upward along the outer surface of the rear exposed transmission case cover that is not covered by the air duct cover, and the footrest at the tip is located near the upper edge of the transmission case cover. .
- the main stand When the occupant stands up in the main stand in the retracted state, the main stand is stood up by stepping on the footrest at the tip of the operating arm that extends upward along the outer surface of the transmission case cover. Let Since the footrest is located close to the outer side of the transmission case cover in the vehicle width direction, when the main stand is raised, the occupant's feet are likely to hit the exposed transmission case cover, and the metal transmission case cover If the painted surface is damaged, the scratches are noticeable and the appearance may be impaired.
- the present invention has been made in view of the above points, and the purpose of the present invention is to accompany the standing operation of the main stand while exposing the transmission case cover and sufficiently maintaining the cooling effect of the belt chamber by the traveling wind. It is in the point which provides the power unit of the saddle-ride type vehicle which can suppress the damage of the coating surface of a transmission case cover.
- a power unit for a saddle-ride type vehicle includes: A power unit in which an internal combustion engine and a belt-type continuously variable transmission are integrally configured and mounted on a saddle-ride type vehicle, and is connected to a crankcase that supports a crankshaft of the internal combustion engine in a vehicle width direction.
- a belt chamber is formed between the transmission case extending to the side of the rear wheel of the vehicle and the side of the transmission case in the vehicle width direction so as to accommodate the belt type continuously variable transmission.
- a metal transmission case cover having a cooling air introduction port for introducing cooling air into the belt chamber at the front, and at least a front portion including the cooling air introduction port of the transmission case cover.
- a resin air guide duct cover that covers from the side of the direction and guides the outside air to the cooling air inlet, and is supported by a lower portion of the crankcase, and stands upright to support the vehicle body and a lower surface of the transmission case.
- At least a part of the transmission case cover is exposed to the outside in a side view, and the wind guide duct cover is configured such that the rear side portion of the duct cover on the rear side of the wind guide duct cover is operated when the main stand is stored. It is arrange
- the wind guide duct cover is disposed up to the rear position where the rear portion of the duct cover exceeds the operation portion when the main stand is stored, so that an occupant can step on the operation portion of the main stand.
- the rear part of the duct cover is placed on the part where the passenger's feet are likely to hit to cover the transmission case cover, so that the metal transmission case cover is not damaged during the standing operation. It can be suppressed and the appearance can be kept good.
- the wind guide duct cover mainly covers at least the front part of the transmission case cover, and the rear part of the duct cover partially covers the transmission case cover to the rear position beyond the operation part of the main stand in the storage position.
- the portion of the transmission case cover that is not covered by the air duct cover can be exposed to a relatively large size, and the transmission is caused by the heat drawn by exposing the exposed portion of the metal transmission case cover to the traveling wind.
- the case cover can be efficiently cooled as a whole, and the effect of promoting the cooling of the belt type continuously variable transmission in the belt chamber by the cooling air introduced from the cooling air inlet into the belt chamber can also be maintained.
- the whole wind guide duct cover including the duct cover rear portion may be formed of colored resin.
- the wind guide duct cover including the duct cover rear portion disposed in a portion where the occupant's feet are likely to hit when the main stand stands, the duct cover rear portion is damaged. Even in the case of scratches, the scratches can be made inconspicuous.
- the rear portion of the duct cover is disposed at a position straddling an imaginary plane including both central axes of the crankshaft and the rear driven shaft, which are front drive shafts around which the belt of the belt type continuously variable transmission is bridged, in the vertical direction. It may be provided.
- the transmission case cover is located in the vehicle width direction in the vicinity of a virtual plane that includes the center axes of the front drive shaft (crankshaft) and the rear driven shaft on which the belt of the belt type continuously variable transmission is bridged. Since it is the part that bulges most outward, it is the part where the occupant's feet are most likely to hit. It is difficult to hit the transmission case cover, and it is possible to prevent the painted surface of the metal transmission case cover from being damaged.
- the duct cover rear side part is located in the center between the upper edge and the lower edge of the transmission case cover in a side view, and is exposed to the outside not covered by the wind guide duct cover of the transmission case cover
- the cover exposed portion includes a rear exposed portion behind the duct cover rear portion, an upper exposed portion and a lower exposed portion formed by extending the upper and lower sides of the duct cover rear portion forward from the rear exposed portion. And a portion.
- the exposed portion of the transmission case cover that is not covered by the wind guide duct cover is formed by extending the upper and lower portions of the rear exposed portion and the rear portion of the duct cover forward from the rear exposed portion.
- the upper exposed portion and the lower exposed portion are provided so that even if the air duct duct cover has a duct cover rear portion, a large surface area of the case cover exposed portion that is not covered by the air duct cover can be secured.
- the heat of the transmission case cover by the running wind can be efficiently performed, and a greater cooling effect of the belt type continuously variable transmission can be expected.
- the transmission case cover may be formed with a fitting recess that is recessed inward in the vehicle width direction so as to fit the rear portion of the duct cover.
- the duct cover rear side portion in the portion that bulges most outward in the vehicle width direction is fitted into the fitting recess formed in the transmission case cover. Protruding outward in the vehicle width direction can be suppressed, and the occupant's feet can also be prevented from hitting the duct cover rear portion.
- the duct cover rear portion may be formed with a duct cover rear recess that is recessed inward in the vehicle width direction at a portion including the virtual plane.
- the vehicle width is set at a portion including a virtual plane that bulges most outward in the vehicle width direction and easily hits the occupant's feet. Since the rear cover side concave portion that is recessed inward in the direction is formed, it is possible to suppress the occupant's feet from hitting the duct cover rear portion.
- the rear portion of the duct cover may be fastened together with the transmission case together with the transmission case cover by fastening bolts that fasten the transmission case cover to the transmission case.
- the duct cover rear portion of the air guide duct cover is fastened together with the transmission case cover together with the transmission case, so the duct cover rear portion is stably fixed even if the rear portion of the duct cover becomes long in the front and rear direction.
- the wind guide duct cover is fastened together with the fastening bolt that fastens the transmission case cover to the transmission case, the number of parts can be reduced.
- the transmission case cover is formed with a fitting recess recessed inward in the vehicle width direction so as to fit the rear portion of the duct cover, and a fastening seat surface to which the fastening bolt in the rear portion of the duct cover is fastened is
- the transmission case cover may be formed on the bottom surface of the bolt insertion recessed portion in the rear portion of the duct cover that is formed to protrude inward in the vehicle width direction to the bottom surface of the fitting recessed portion.
- the fastening seat surface to which the fastening bolt in the rear portion of the duct cover is fastened is formed so as to protrude inward in the vehicle width direction to the bottom surface of the fitting concave portion of the transmission case cover. Because it is formed on the bottom surface of the bolt insertion recess, even when the rear part of the duct cover is fastened together with the transmission case cover together with the transmission case, a short fastening bolt is used and the fastening bolt protrudes outward in the vehicle width direction. It is possible to tighten together without letting
- the air guide duct cover may be formed such that a duct cover rear portion extends rearward from a duct cover front main portion covering a front portion of the transmission case cover.
- the wind guide duct cover is formed by extending the rear portion of the duct cover from the front main portion of the duct cover that covers the front portion of the transmission case cover toward the rear.
- the main part on the front side of the cover and the rear side part of the duct cover are integrally formed continuously, reducing the number of parts and facilitating the assembly work. Further, by fastening the duct cover rear portion together with the transmission case cover to the transmission case, the wind guide duct cover can be securely attached to the transmission case with a small number of fastening bolts.
- the wind guide duct cover includes a duct cover front main part that covers a front part of the transmission case cover, and a duct cover rear part that is divided and disposed behind the duct cover front main part. You may make it do.
- the duct guide front main part and the duct cover rear side part are divided into front and rear parts and configured separately, so that various appearances can be easily formed according to the divided arrangement state. it can. Also, if the rear part of the duct cover is fastened together with the transmission case cover together with the transmission case cover, the front main part of the wind guide duct cover can be removed without removing the fastening bolts to be fastened, and maintenance etc. Good maintainability when performing.
- the rear portion of the duct cover of the air guide duct cover is disposed up to a rear position beyond the operation portion when the main stand is retracted, so that an occupant stands on the operation portion of the main stand to stand the main stand.
- the rear part of the duct cover is placed over the transmission case cover where it is easy for the passenger's feet to hit, so that the passenger's feet do not hit the metal transmission case cover as much as possible. Further, it is possible to prevent the painted surface of the metal transmission case cover from being scratched and to maintain a good appearance.
- the wind guide duct cover mainly covers at least the front part of the transmission case cover, and the rear part of the duct cover partially covers the transmission case cover to the rear position beyond the operation part of the main stand in the storage position.
- the portion of the transmission case cover that is not covered by the air duct cover can be exposed to a relatively large size, and the transmission is caused by the heat drawn by exposing the exposed portion of the metal transmission case cover to the traveling wind.
- the case cover can be efficiently cooled as a whole, and the effect of promoting the cooling of the belt type continuously variable transmission in the belt chamber by the cooling air introduced from the cooling air inlet into the belt chamber can also be maintained.
- FIG. 1 is an overall left side view of a motorcycle including a power unit according to a first embodiment of the present invention. It is a left view of a power unit.
- FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a left view of the V belt type continuously variable transmission of a power unit.
- FIG. 5 is a sectional view taken along line VV in FIG. 4.
- FIG. 6 is a sectional view taken along line VI-VI in FIG. 4.
- FIG. 7 is a sectional view taken along line VII-VII in FIG. 4.
- It is a left view of a transmission case cover. It is a left view of an inner duct member. It is a left view of a wind guide duct cover. It is a right view of the same air duct cover.
- FIG. 1 is a side view of a motorcycle 1 that is a straddle-type vehicle equipped with a power unit according to a first embodiment to which the present invention is applied.
- the directions of front, rear, left and right are based on a normal standard in which the straight traveling direction of the motorcycle 1 on which the power unit according to the present embodiment is mounted is the front.
- RR indicates the rear
- LH indicates the left side
- RH indicates the right side.
- the vehicle body front portion 1f and the vehicle body rear portion 1r are connected via a low floor portion 1c, and the vehicle body frame forming the skeleton of the vehicle body is generally composed of the down tube 3 and the main pipe 4. That is, the down tube 3 extends downward from the head pipe 2 at the front part 1f of the vehicle body, the down tube 3 is bent horizontally at the lower end and extends rearward under the floor 1c, and a pair of left and right main pipes 4 at the rear end.
- the main pipe 4 rises upward from the connecting portion, bends, and extends obliquely rearward.
- a seat 5 is disposed above the main pipe 4.
- a handle 6 is provided on the upper side and is pivotally supported by the head pipe 2.
- a front fork 7 extends downward and a front wheel 8 is pivotally supported at the lower end thereof.
- the power unit P mounted on the motorcycle 1 is configured by extending a V-belt type continuously variable transmission T from the front internal combustion engine E to the rear.
- the internal combustion engine E is a single-cylinder four-stroke internal combustion engine, and a cylinder block 22, a cylinder head 23, and a cylinder head cover 24 are forwarded from a crankcase 21c that supports a crankshaft 20 (see FIG. 2) oriented in the vehicle width direction. It protrudes greatly and leans forward to a state that is almost horizontal.
- a pair of left and right support brackets 12, 12 extend downward from the lower end of the crankcase 21, and the support brackets 12, 12 have hanger brackets 12 h, 12 h protruding forward, and the hanger brackets 12 h are connected to the main pipe 4.
- the power unit P is connected and supported so as to be swingable with respect to the vehicle body through a bracket 10 and a link member 11 projecting rearward from the front lower portion.
- a V-belt type continuously variable transmission T extending rearward from the internal combustion engine E in the power unit P has a rear wheel 15 on a rear axle 14 which is an output shaft of a reduction gear mechanism Tr (see FIG. 2) provided at the rear part thereof. Is provided.
- a rear cushion 17 is interposed between the support bracket 16 erected at the rear end of the V-belt type continuously variable transmission T and the rear portion of the main pipe 4 (see FIG. 1).
- An intake pipe 25 extends from the upper part of the cylinder head 23 which is largely inclined forward of the internal combustion engine E, curves backward, and reaches the air cleaner 27 above the V-belt type continuously variable transmission T via the throttle body 26.
- the exhaust pipe 28 extending downward from the lower portion of the cylinder head 23 is bent rearward, is biased to the right and extends rearward, and is connected to the muffler 29 on the right side of the rear wheel 21.
- the support brackets 12 and 12 extending from the lower end of the crankcase 21c support the base end rotation shaft 31 of the main stand 30 in the vehicle width direction.
- the main stand 30 has a pair of left and right leg portions 32, 32 extending from the base end rotation shaft 31 so as to extend toward each other, and the left and right leg portions 32, 32 are connected by a connecting bar 32b (see FIG. 3).
- An operation arm 33 extends to the left from a portion near the tip of the left leg 32.
- the main stand 30 has a spring 36 between a latching piece 35 a at the center of the leg portion 32 and a latching pin 35 b near the upper side of the base end rotation shaft 31 of the support bracket 12. It is interposed so that both standing and lying states of the legs 32 of the main stand 30 can be maintained.
- the standing state of the main stand 30 is indicated by a solid line
- the retracted state (the lying state of the leg portion 32) is indicated by a two-dot chain line
- FIGS. 2 and 3 indicate the retracted state. That is, the main stand 30 swings around the base end rotation shaft 31, and as shown in FIG. 1, the leg 32 is erected to support the vehicle body, and the leg 32 is swung upward during traveling.
- a V-belt type continuously variable transmission T is laid down substantially horizontally along the lower surface to be in a retracted state.
- the operating arm 33 extending leftward from the left leg 32 is a V-belt type stepless.
- the central portion of the transmission T in the front-rear direction is curved from the lower surface along the left side surface and extends upward.
- a footrest plate 33 a is fixed to the tip of the operation arm 33.
- the crankcase 21c that supports the crankshaft 20 with the crankshaft 20 oriented in the vehicle width direction is configured by combining the right crankcase portion 21R and the front portion 21Tf of the long transmission case 21T on the left and right sides (see FIG. 3). As shown in FIG. 5, the left transmission case 21 ⁇ / b> T extends rearward from the front portion 21 ⁇ / b> Tf to the side of the rear wheel 15.
- the transmission case 21T has a front portion 21Tf joined with the right crankcase portion 21R to form a crankcase 21c, and has a long oval shape extending forward and backward from the front portion 21Tf and opened to the left. Then, a transmission case cover 60 is covered from the left side, and a belt chamber 55 is formed inside, and the V-belt type continuously variable transmission T is accommodated in the belt chamber 55.
- the power unit P includes an internal combustion engine E and a belt type continuously variable transmission T that are integrally formed.
- the front drive shaft of the V-belt type continuously variable transmission T is a crankshaft 20, and a drive pulley is connected to an extension shaft portion protruding from the transmission case 21 ⁇ / b> T of the crankshaft 20 into the belt chamber 55.
- 40 is provided.
- the drive pulley 40 is pivotally supported on the extension shaft portion of the crankshaft 20 so as to be opposed to the right side of the fixed drive pulley half 40a and to be slidable in the axial direction.
- a movable driving pulley half 40b The fixed drive pulley half 40a and the movable drive pulley half 40b have opposing tapered surfaces that face each other and sandwich the V-belt 44 therebetween.
- a plurality of centrifugal weights 42 have a diameter between a curved back surface behind the movable drive pulley half 40b (right side) and a guide plate 41 that is pivotally supported by the extension shaft portion of the crankshaft 20 and fixed in contact with the journal portion. It is arranged so as to be movable in the direction. Many blades of the cooling fan 43 are formed on the back surface (left surface) of the fixed drive pulley half 40a.
- the rear rear driven shaft corresponding to the front drive shaft (crankshaft 20) on which the drive pulley 40 is supported is the reduction gear input shaft 45 of the reduction gear mechanism Tr, and is relatively rotatable with respect to the reduction gear input shaft 45.
- a fixed driven pulley half 47a is fitted to the inner sleeve 46a supported by the outer sleeve 46a, and a movable driven pulley half is fitted to an outer sleeve 46b that is externally supported so as to be movable relative to the inner sleeve 46a on the left side of the fixed driven pulley half 47a.
- the body 47b is fitted, and the driven pulley 47 is constituted by the driven pulley halves 47a and 47b.
- the movable driven pulley half 47b is biased by a spring 48 in a direction approaching the fixed driven pulley half 47a, and a torque cam is provided between the outer sleeve 46b and the inner sleeve 46a integral with the movable driven pulley half 47b.
- Mechanism 49 is incorporated.
- the V belt 44 is sandwiched between both driven pulley halves 47a and 47b.
- V-belt type continuously variable transmission T when the V-belt 44 is wound around the drive pulley 40 and the driven pulley 47 and the engine speed (the rotational speed of the crankshaft 20) changes, Since the centrifugal weight 42 moves in the radial direction and the movable drive pulley half 40b moves in the axial direction to change the groove width between the drive pulley halves 40a and 40b, the drive pulley 40 of the V belt 44 is changed. When the winding diameter is changed, the winding diameter on the driven pulley 47 is naturally changed via the endless V-belt 44, and the gear is shifted.
- a centrifugal clutch 50 is provided on the left side of the speed reducer input shaft 45 and the inner sleeve 46a.
- a clutch outer 52 that covers the outer periphery of the clutch inner 51 that is fitted to the inner sleeve 46a is fitted to the reduction gear input shaft 45, and the clutch inner 51 swings in the centrifugal direction against the spring 51b.
- a moving clutch shoe 51 s is provided to face the inner peripheral surface of the clutch outer 52. Therefore, when the rotational speed of the power transmitted to the inner sleeve 46a via the V-belt 44 increases, the clutch shoe 51s swings in the centrifugal direction against the spring 51b and moves to the inner peripheral surface of the clutch outer 52. Then, the centrifugal clutch 50 is engaged and transmitted to the reduction gear input shaft 45.
- the left side of the longitudinally long transmission case 21T is covered with a transmission case cover 60, and there is no V-belt type in the belt chamber 55 formed between the transmission case 21T and the transmission case cover 60.
- a step transmission T is provided and a centrifugal clutch 50 is also accommodated.
- the transmission case cover 60 is made of a metal aluminum alloy, and the surface thereof is painted.
- FIG. 8 shows a left side view of the transmission case cover 60.
- transmission case cover 60 covers cooling fan 43 formed on fixed drive pulley half 40a fitted to the left end of crankshaft 20 as the front drive shaft from the left side.
- a case cover central portion 60c that connects the two to each other, and has a long oval shape in front and rear in a side view.
- the VV line in FIG. FIG. 5 which is a cross-sectional view, is a cross-sectional view of the V-belt type continuously variable transmission T cut along a virtual plane Li.
- the front drive pulley 40 and the rear driven pulley 47 are in the same position in the vehicle width direction because the V-belt 44 is bridged, and the centrifugal clutch 50 is driven on the rear side. Located on the left side of the pulley 47.
- a case cover rear side portion 60r covering the centrifugal clutch 50 bulges outward in the vehicle width direction from a case cover front side portion 60f covering the drive pulley 40 and the cooling fan 43 (see FIG. 5). .
- the case cover front portion 60f covering the drive pulley 40 of the transmission case cover 60 from the left side and the case cover front portion 60f from the top and bottom to the case cover center portion 60c along the top and bottom edges respectively.
- the extending upper edge extending portion 60fu and the lower edge extending portion 60fl constitute the innermost portion 60A (the portion to which the finest lattice hatching is applied in FIG. 8) that is the innermost in the vehicle width direction.
- a cooling air inlet 61 for introducing the cooling air into the belt chamber 55 is formed large in the case cover front side portion 60f.
- a case cover rear portion 60r that covers the centrifugal clutch 50 of the transmission case cover 60 from the left side and an upper extending portion 60ru that extends forward and downward from the case cover rear portion 60r into the case cover central portion 60c.
- the side extending portion 60rl constitutes the outermost portion 60D (the portion not hatched in FIG. 8) that is the leftmost outermost in the vehicle width direction.
- the upper extension portion 60ru and the lower extension portion of the outermost portion 60D As shown in FIG. 8, in the case cover center portion 60c between the case cover front side portion 60f and the case cover rear side portion 60r of the transmission case cover 60, the upper extension portion 60ru and the lower extension portion of the outermost portion 60D.
- the front end tapered portion of 60rl is fitted so that the upper edge extending portion 60fu and the lower edge extending portion 60fl of the innermost part 60A are sandwiched from above and below.
- a fitting recess 60v that is recessed inward in the vehicle width direction is formed between an upper extending portion 60ru and a lower extending portion 60rl that extend in a bifurcated manner from the case cover rear portion 60r of the outermost portion 60D. Yes.
- the fitting recess 60v formed between the upper extending portion 60ru and the lower extending portion 60rl is in a position straddling the virtual plane Li in the vertical direction, and is formed to taper by gradually narrowing the vertical width toward the rear.
- the fitting recess 60v has a recess depth (vehicle width direction position) that differs between the front and rear, and the front recess position 60B on the front side (the portion that is coarser than the innermost portion 60A in FIG. 8) and the rear.
- the rear-side recessed portion 60C on the side (the portion in FIG. 8 where the lattice hatching is coarser than the front-side recessed portion 60B) is located between the innermost portion 60A and the outermost portion 60D.
- the innermost portion 60A, the front concave portion 60B, the rear concave portion 60C, and the outermost portion 60D are located on the left outer side in this order in the vehicle width direction (see FIG. 5).
- the rear recessed portion 60C on the rear side of the fitting recessed portion 60v is provided with an operating arm 33 located on the left side of the V-belt type continuously variable transmission T in the retracted state where the main stand 30 has laid the leg portion 32 down. It becomes the same front-back direction position (refer FIG. 2).
- annular convex rib 62 is formed around the cooling air inlet 61 on the left side surface of the case cover front side portion 60 f of the transmission case cover 60.
- three cylindrical mounting bosses 63 are formed around the large cooling air inlet 61 at the center so as to protrude to the left (outward direction of the vehicle width). Yes.
- Three cylindrical mounting bosses 63 are formed in front of the cooling air introduction port 61 and the other two are formed obliquely above and below the cooling air introduction port 61.
- the cylindrical mounting boss 63 is formed with a screw hole.
- a central cylindrical mounting boss portion 64 is formed at the rear portion of the front concave portion 60B so as to protrude inward (right side) in the vehicle width direction (see FIGS. 5 and 8).
- the central cylindrical mounting boss portion 64 slightly protrudes inward (left side) in the vehicle width direction.
- a plurality of mounting boss portions 65 for coupling the transmission case cover 60 to the transmission case 21T are formed on the outer peripheral edge of the transmission case cover 60 that is elliptical when viewed from the side.
- the wind guide duct cover 80 covers the innermost part 60A excluding the outermost part 60D, the front recessed part 60B, and the rear recessed part 60C in the transmission case cover 60 from the outer side in the vehicle width direction. Therefore, as shown in FIG. 4, when the transmission case cover 60 is covered with a wind guide duct cover 80 (a member with a dotted pattern in the drawing), the transmission case cover 60 is only in the outermost portion 60D. Is exposed to the outside.
- a wind guide duct cover 80 is placed on the case cover front side portion 60f including the cooling air introduction port 61 of the transmission case cover 60 from the outside with the inner duct member 70 interposed therebetween.
- the inner duct member 70 and the air guide duct cover 80 are made of resin.
- the inner duct member 70 has a case cover facing portion 70f facing the case cover front side portion 60f of the transmission case cover 60 in a side view and an upper portion of the case cover facing portion 70f bulging upward.
- a cooling air introduction hole 71 is formed in the center of the case cover facing portion 70f so as to face and overlap the cooling air introduction port 61 of the transmission case cover 60.
- An edge concave rib 72 is formed (see FIG. 5).
- a cylindrical mounting boss portion 73 into which the cylindrical mounting boss portion 63 fits in correspondence with the three cylindrical mounting boss portions 63 of the transmission case cover 60 is provided on the outer side in the vehicle width direction (left side). ) Protruding.
- the end of the cylindrical mounting boss 73 has an annular bottom wall 73b.
- a wind guide concave rib 75 having a concave cross section is formed continuously from the outer periphery of the circular hole 71 of the case cover facing portion 70a to the upper edge of the upper bulging portion 70b. ing. As shown in FIG. 9, the air guide concave rib 75 surrounds the outer periphery of the circular hole 71 in the order of three quarters from the upper part to the front part, the lower part, and the rear part. Open and extend upward, bend and go forward along the upper edge of the upper bulging portion 70b, bend along the front edge and extend downward.
- the air guide duct cover 80 is a duct cover front main part facing the case cover facing part 70 f of the inner duct member 70 fitted into the case cover front part 60 f of the transmission case cover 60.
- 80f and an outside air intake portion 80b opposite to the upper bulging portion 70b of the inner duct member 70 are formed on the front side and extend rearward of the outside air intake portion 80b to face the upper edge extension portion 60fu of the transmission case cover 60
- An extending portion 80fu is formed, and a lower edge extending portion 80fl that extends rearward from the lower portion of the duct cover front main portion 80f and faces the lower edge extending portion 60fu of the transmission case cover 60 is formed.
- the wind guide duct cover 80 is formed such that a duct cover rear portion 80r extends rearward from the duct cover front main portion 80f.
- the duct cover rear side portion 80r is formed in a tapered shape so that the vertical width gradually decreases toward the rear so as to face the fitting recess 60v of the transmission case cover 60.
- a duct cover rear recess 80rd that is slightly recessed inward (right side) in the vehicle width direction is formed in the rear half of the duct cover rear portion 80r (see FIG. 3).
- the duct cover rear concave portion 80rd is formed in a horizontally long rectangular shape at a central portion (a portion straddling the virtual plane Li in the vertical direction) including the virtual plane Li of the duct cover rear portion 80r (see FIG. 4).
- the duct cover rear side recess 80rd in the duct cover rear side portion 80r may not be recessed.
- a mounting cylindrical portion 83 that forms an insertion recess 83d (see FIG. 6) is formed to protrude rightward.
- the annular bottom wall 83b at the end of the protruding mounting cylindrical portion 83 abuts on the annular bottom wall 73b of the opposing cylindrical mounting boss portion 73.
- An annular bottom wall 83b at the end of the mounting cylindrical portion 83 constitutes the bottom surface of the bolt insertion recess 83d and serves as a fastening seat surface 83bs of the fastening bolt 91.
- the duct cover rear portion 80r of the air duct cover 80 has a portion where the duct cover rear recess 80rd is formed, and a front recess portion 60B of the transmission case cover 60.
- a central mounting cylindrical portion 84 that forms a bolt insertion concave portion 84d that protrudes inward (right side) in the vehicle width direction so as to face the protruding central cylindrical mounting boss portion 64 is formed to protrude rightward.
- the annular bottom wall 84b at the end of the protruding central mounting cylinder 84 abuts the end of the opposing central cylindrical mounting boss 64.
- An annular bottom wall 84b at the end of the central mounting cylindrical portion 84 constitutes the bottom surface of the bolt insertion recess 84d and serves as a fastening seat surface 84bs of the fastening bolt 92.
- the wind guide is opposed to the wind guide concave rib 75 formed on the left side surface of the inner duct member 70.
- a convex rib 85 is formed so as to protrude.
- An outside air intake 81 opens toward the front of the outside air intake portion 80b of the air guide duct cover 80.
- the outside air inlet 81 is provided with a louver 82 that guides outside air and prevents foreign substances from entering. Yes.
- the entire wind guide duct cover 80 including the duct cover rear portion 80r is formed of a colored resin.
- the transmission case cover 60 is covered with the transmission case 21T having the alignment surface at the periphery.
- the mounting boss portion 65 formed on the outer peripheral edge of the transmission case cover 60 is fastened to the transmission case 21T by the fastening bolt 90, and the transmission case cover 60 is attached to the transmission case 21T.
- the transmission case cover 60 is attached to the transmission case 21 ⁇ / b> T
- the mounting boss protruding from the left side surface of the transmission case 21 ⁇ / b> T is opposed to the central cylindrical mounting boss portion 64 of the transmission case cover 60.
- the end surface of the central cylindrical mounting boss portion 64 on the transmission case cover 60 side contacts the end surface of the portion 21b.
- a screw hole is formed in the end face of the mounting boss portion 21b.
- the inner duct member 70 is superimposed on the case cover front side portion 60f of the transmission case cover 60 attached to the transmission case 21T.
- the three cylindrical mounting bosses 63 protruding from the case cover front portion 60f are positioned so as to fit into the cylindrical mounting bosses 73 of the inner duct member 70, respectively, and the inner duct member 70 is attached to the transmission case cover 60.
- the rim convex rib 62 of the transmission case cover 60 and the lip concave rib 72 of the inner duct member 70 are fitted with the seal member 68 interposed therebetween, and the cooling air inlet of the transmission case cover 60 is fitted.
- 61 and the cooling air introduction hole 71 of the inner duct member 70 are in communication with each other.
- the air duct cover 80 is covered from the side in a state where the inner duct member 70 is superimposed on the case cover front side portion 60f of the transmission case cover 60.
- a wind guide convex rib 85 of the wind guide duct cover 80 is fitted to the wind guide concave rib 75 of the inner duct member 70 with the seal member 78 interposed therebetween, and the wind guide duct is fitted to the fitting recess 60v of the transmission case cover 60.
- the duct cover rear portion 80 r of the cover 80 is fitted, and the air guide duct cover 80 is fitted to the inner duct member 70 and the transmission case cover 60.
- the wind guide duct cover 80 with the dotted pattern in FIG. 4 has a duct cover front main part 80f and an outside air intake part 80b, as shown in FIG.
- the inner duct member 70 superimposed on the portion 60f is covered from the outside, and the upper edge extending portion 80fu and the lower edge extending portion 80fl of the air guide duct cover 80 are respectively an upper edge extending portion 60fu and a lower edge extending portion of the transmission case cover 60.
- Covers 60fl Therefore, the duct cover front main part 80f and the outside air intake part 80b cover the innermost part 60A of the transmission case cover 60 from the outside, and the duct cover rear part 80r is fitted in the fitting recess 60v of the transmission case cover 60. Then, the front concave portion 60B and the rear concave portion 60C are covered.
- the portion of the transmission case cover 60 that is not covered by the air guide duct cover 80 is the outermost portion 60D that includes the case cover rear portion 60r, the upper extending portion 60ru, and the lower extending portion 60rl.
- the part 60D becomes the case cover exposed part 60D exposed to the outside.
- the case cover rear portion 60r, the upper extended portion 60ru, and the lower extended portion 60rl become a rear exposed portion 60r, an upper exposed portion 60ru, and a lower exposed portion 60rl, respectively (see FIG. 4).
- the bottom walls 83b of the three mounting cylindrical portions 83 of the wind guide duct cover 80 abut against the bottom walls 73b of the cylindrical mounting boss portions 73 of the inner duct member 70, respectively, and the central mounting cylindrical portion 84 of the wind guide duct cover 80 is contacted.
- the bottom wall 84b of the transmission case abuts against an end portion of the central cylindrical mounting boss portion 64 of the transmission case cover 60 that slightly protrudes outward in the vehicle width direction.
- fastening bolts 91 are respectively inserted into the bolt insertion recesses 83d of the three mounting cylindrical portions 83 of the air guide duct cover 80 from the outside in the vehicle width direction, and the annular bottom wall 83b of the mounting cylindrical portion 83
- the inner duct member 70 is threaded through the annular bottom wall 73b of the cylindrical mounting boss 73 of the inner duct member 70 and screwed into the screw hole of the cylindrical mounting boss 63 of the transmission case cover 60.
- the air duct cover 80 are fastened.
- the fastening bolt 91 Since the bottom surface of the bolt insertion recessed portion 83d of the mounting cylindrical portion 83 becomes the fastening seat surface 83bs of the fastening bolt 91, the fastening bolt 91 is attached to the cylinder of the transmission case cover 60 with the bolt head inserted into the bolt insertion recessed portion 83d. Since it approaches the screw hole of the boss part 63, a short fastening bolt can be used.
- a fastening bolt 92 is inserted from the outside in the vehicle width direction into the bolt insertion recess 84d of the central mounting cylindrical portion 84 formed in the duct cover rear portion 80r of the air duct cover 80, and the center Passes through the annular bottom wall 84b of the mounting cylindrical portion 84, further passes through the central cylindrical mounting boss portion 64 of the transmission case cover 60, and is screwed into the screw hole of the mounting boss portion 21b of the transmission case 21T, The transmission case 21T is fastened together with the transmission case cover 60 by fastening the duct cover rear portion 80r of the air duct cover 80 together.
- the fastening bolt 92 Since the bottom surface of the bolt insertion concave portion 84d of the central mounting cylindrical portion 84 becomes the fastening seat surface 84bs of the fastening bolt 92, the fastening bolt 92 is inserted into the bolt insertion concave portion 84d and the mounting boss of the transmission case 21T.
- the rear portion 80r of the duct cover is fastened together with the transmission case cover 60 together with the transmission case 21T in order to approach the screw hole of the portion 21b, a short fastening bolt is used and the fastening bolt is moved outward in the vehicle width direction. It is possible to fasten without projecting.
- the air duct cover 80 is attached with the inner duct member 70 interposed therebetween.
- the duct cover rear portion 80r of the air guide duct cover 80 is fitted into the fitting recess 60v that is located across the virtual plane Li of the transmission case cover 60 in the vertical direction. Therefore, the duct cover rear portion 80r is It is in a position straddling the virtual plane Li in the vertical direction.
- the duct cover rear portion 80r of the air guide duct cover 80 is located at a position straddling the virtual plane Li in the vertical direction and is fitted into the fitting recess 60v of the transmission case cover 60. Protrusion of the side portion 80r outward in the vehicle width direction is suppressed (see FIGS. 3 and 7). Further, a duct cover rear concave portion 80rd that is recessed inward in the vehicle width direction is formed in a portion including the virtual plane Li of the duct cover rear portion 80r, and the duct cover rear portion 80r extends outward in the vehicle width direction. Protrusion is further suppressed (see FIGS. 3 and 7).
- the cooling fan 43 formed on the back surface of the fixed drive pulley half 40 a is rotated by the rotation of the crankshaft 20, so that the outside air intake opening opened to the outside air intake portion 80 b of the air guide duct cover 80.
- the outside air is taken in from 81, and the introduced cooling air is guided through the air guide passage formed by the fitting of the air guide convex rib 85 of the air guide duct cover 80 and the air guide concave rib 75 of the inner duct member 70.
- the belt type continuously variable transmission T in the belt chamber 55 is cooled by being introduced into the belt chamber 55 from the cooling air introduction hole 71 and the cooling air introduction port 61.
- the main stand 30 provided at the lower portion of the power unit P extends to the left from the left leg 32 when the leg 32 is laid down in the retracted state.
- the arm 33 is bent from the bottom surface to the left side at the center of the transmission case cover 60 that covers the V-belt type continuously variable transmission T from the left and extends upward,
- the footrest plate 33a reaches the vicinity of the upper edge of the transmission case cover 60.
- the wind guide duct cover 80 which is mounted mainly covering the front part from the side of the transmission case cover 60, has a duct cover rear part extending rearward from the duct cover front main part 80f. 80r extends rearward from the operation arm 33 when the main stand 30 is stored.
- the embodiment of the power unit P of the motorcycle 1 that is the saddle riding type vehicle according to the present invention described in detail has the following effects.
- the operating arm 33 of the main stand 30 in the retracted state is located behind the leg portion 32 lying down along the lower surface of the transmission case cover 60 and rearward of the center portion in the front-rear direction of the transmission case cover 60. Is bent from the lower surface along the left side surface and extends upward, and the footrest plate 33a at the tip thereof is in a position reaching the upper edge of the transmission case cover 60.
- the duct cover rear portion 80 r of the resin air duct cover 80 that covers the transmission case cover 60 from the side in the vehicle width direction is used for operation when the main stand 30 is stored. Since it is disposed up to the rear position beyond the arm 33, when the occupant stands on the footrest plate 33a of the main stand 30 to stand the main stand 30, the transmission case cover 60 is placed at a position where the occupant's foot can easily touch.
- the metal transmission case cover can be prevented from being damaged during the standing operation, and the appearance can be kept good.
- the wind guide duct cover 80 including the duct cover rear portion 80r disposed at a position where the passenger's feet can easily hit when the main stand stands, the duct cover rear portion 80r is formed by colored feet. Even if it is scratched, the scratch can be made inconspicuous and the appearance is not impaired.
- the air guide duct cover 80 mainly covers at least the front side portion of the transmission case cover 60, and the duct cover rear side portion 80r covers the transmission case cover 60 to a rear position beyond the operation arm 33 of the main stand 30 in the retracted position.
- partially covering it is possible to expose a relatively large portion of the transmission case cover 60 that is not covered by the air duct cover 80, and the exposed portion of the metal transmission case cover 60 is exposed to the driving wind.
- the belt case continuously variable transmission in the belt chamber 55 by the cooling air introduced from the cooling air inlet 61 into the belt chamber 55 can be efficiently cooled as a whole by the heat drawn by the The effect of promoting the cooling of the machine T can also be maintained.
- the vicinity of the virtual plane Li including both the central axes is a part where the transmission case cover 60 bulges most outward in the vehicle width direction.
- the duct cover rear side portion 80 r at a position straddling the virtual plane Li of the air guide duct cover 80 in the vertical direction is fitted in the fitting recess 60 v of the transmission case cover 60.
- the outward protrusion in the vehicle width direction is suppressed, the occupant's feet are prevented from contacting.
- the part including the virtual plane Li of the duct cover rear portion 80r is recessed to form the duct cover rear recess 80rd, it is possible to further suppress contact of the passenger's feet (see FIG. 3). .
- the duct cover rear portion 80r of the air duct cover 80 is located at the center between the upper edge and the lower edge of the transmission case cover 60 in a side view, and
- the case cover exposed portion 60D exposed to the outside that is not covered by the air duct cover 80 includes a rear exposed portion 60r behind the duct cover rear portion 80r, and a duct cover rear portion 80r from the rear exposed portion 80r.
- the upper exposed portion 60ru and the lower exposed portion 60rl formed by extending the top and bottom forward can be provided, and a large surface area of the case cover exposed portion 60D that is not covered by the air duct cover 80 can be secured.
- the heat of the transmission case cover 60 by wind can be efficiently performed, and a greater cooling effect of the belt type continuously variable transmission T can be expected.
- the duct cover rear portion 80r of the air duct cover 80 is fastened together with the transmission case cover 60 together with the transmission case 21T by the fastening bolt 92, so that the duct cover rear portion 80r is moved back and forth. It can be fixed stably even if it becomes long, and the wind guide duct cover 80 is fastened together with the fastening bolt 92 that fastens the transmission case cover 60 to the transmission case 21T. Can be reduced.
- the fastening seat surface 84bs to which the fastening bolt 92 is fastened in the duct cover rear portion 80r of the air guide duct cover 80 extends to the bottom surface of the fitting recess 60v of the transmission case cover 60 in the vehicle width direction. Even if the duct cover rear portion 80r is fastened together with the transmission case cover 60 to the transmission case 21T because it is formed on the bottom surface of the bolt insertion recess 84d formed in the duct cover rear portion 80r.
- the short fastening bolt 92 can be used to fasten the fastening bolt 92 without protruding outward in the vehicle width direction.
- the present air duct cover 80 is formed by extending a duct cover rear portion 80r from the duct cover front main portion 80f covering the front portion of the transmission case cover 60 toward the rear, so that the air duct cover 80 is
- the duct cover front main portion 80f and the duct cover rear portion 80r are integrally formed continuously, reducing the number of parts and facilitating assembly work. Further, by fastening the duct cover rear portion 80r together with the transmission case cover 60 to the transmission case 21T, the air guide duct cover 80 can be securely attached to the transmission case with a small number of fastening bolts.
- the resin air guide duct cover 80 is formed by integrally forming the duct cover front main part 80f and the duct cover rear part 80r.
- a second embodiment in which the main part on the front side of the cover is divided and configured separately will be described below.
- FIG. 1 A left side view of the power unit P1 of the first example of the second embodiment is shown in FIG.
- the wind guide duct cover 100 is made of colored resin, and the duct cover front side main part 100f and the duct cover rear side part 100r are separately formed, and both abut the divided end faces 100fe and 100re.
- the duct cover front main part 100f is formed with an outside air intake part 100b, an upper edge extension part 100fu, and a lower edge extension part 100fr. As shown in FIG. 12, the duct cover front main part 100f and the duct cover rear part are formed.
- the state in which the side portions 100r are continuously provided has the same shape as the air guide duct cover 80 of the first embodiment.
- the split end faces 100fe and 100re of the duct cover front main part 100f and the duct cover rear part 100r are angled backward from the upper and lower intersections where the upper and lower edges of the duct cover rear part 100r intersect the duct cover front main part 100f. It is formed so as to protrude.
- the duct cover front main part 100f is fastened to the transmission case cover 60 by three fastening bolts 91, and the duct cover rear part 100r is fitted to the fitting recess 60v of the transmission case cover 60 and fastened by the fastening bolt 92. It is fastened together with the transmission case cover 60 together with the transmission case 21T.
- this power unit P1 prevents the painted surface of the transmission case cover 60 from being damaged by the occupant's feet as much as possible when the main stand is raised, and has the fastening bolt 92 to be fastened together. Without removing, the duct cover front main part 100f can be removed, and maintenance is good when performing maintenance or the like. In addition, various appearances can be formed by changing the shapes of the divided end faces 100fe and 100re without changing the shape of the entire air guide duct cover 100.
- the main air duct cover 110 of the power unit P2 of the second modified example is made of colored resin, and the duct cover rear side portion 110r is separated from the duct cover front side main portion 110f and separated from the rear side.
- the duct cover front main part 110f is integrally formed with the outside air intake part 110b, the upper edge extension part 110fu, and the lower edge extension part 110fr, and the duct cover front side main part 100f, the outside air intake part 100b, and the upper part of the first example.
- the duct cover rear portion 110r has the same shape as the edge extension portion 100fu and the lower edge extension portion 100fr, but the split end surface 100re of the duct cover rear portion 100r in the first example has a shape in which it is retracted rearward. ing.
- the duct cover front main part 110f and the duct cover rear main part 110r have a split end face 110re that forms an angle in a concave shape of the duct cover rear part 110r from the split end face 110fe that forms an angle in the convex shape of the duct cover front main part 110f. It is spaced apart rearward. As shown in FIG. 13, it is possible to form a characteristic appearance in which the transmission case cover 60 can be seen between the divided end surfaces 110fe and 110re that are separated from each other.
- the transmission case cover 60 partially bulges between the separated end faces 110fe and 110re of the duct cover front main part 110f and the duct cover rear part 110r, and the bulging surface is the duct cover front main part.
- the same surface as 110f and the duct cover rear portion 110r may be formed.
- the transmission case cover 60 Since the transmission case cover 60 is exposed to the outside between the separated end surfaces 110fe and 110re of the duct cover front side main portion 110f and the duct cover rear side portion 110r, the transmission case cover 60 made of metal is exposed. The number of parts is increased, the heat of the transmission case cover 60 is accelerated by the traveling wind, and the cooling effect of the belt type continuously variable transmission T can be expected.
- the duct cover rear portion 110r is disposed up to a rear position beyond the operation arm 33 when the main stand 30 is stored, so that the duct stand rear portion 110r is used for the main stand standing operation. Damage to the painted surface of the transmission case cover 60 can be suppressed.
- the duct cover front main part 110f is fastened to the transmission case cover 60 by three fastening bolts 91, and the duct cover rear part 110r is fitted into the fitting recess 60v of the transmission case cover 60 to be fastened by the fastening bolt 92. Because of this, the transmission case cover 60 and the transmission case 21T are fastened together and fastened, so that the duct cover front main part 100f can be removed without removing the fastening bolt 92 to be fastened together, and maintenance is performed. Good maintainability.
- the main air duct cover 120 of the power unit P3 of the third modified example is made of colored resin, and the duct cover front main part 120f and the duct cover rear part 120r are configured as separate bodies, but are partially overlapped. Established.
- the duct cover rear side portion 120r has substantially the same shape as the duct cover rear side portion 120r of the first example shown in FIG. 12, but the duct cover front side main portion 120f has a split end surface 120fe that forms an angle in a convex shape.
- the extension part 120ff extends rearward so that is moved rearward, and the rear end face of the extension part 120ff is a divided end face 120fe.
- the duct cover front side main The portion 120f is fastened to the transmission case cover 60 by three fastening bolts 91 with the extending portion 120ff overlapped with the front end portion of the duct cover rear portion 120r from the outside in the vehicle width direction.
- the duct cover front main part 100f can be removed without removing the fastening bolt 92 to be fastened together, and the maintainability when performing maintenance or the like is good.
- the duct cover rear portion 110r is disposed so as to cover the transmission case cover 60 to a rear position beyond the operation arm 33 when the main stand 30 is stored. With 110r, it is possible to suppress damage to the painted surface of the transmission case cover 60 that accompanies the main stand standing operation.
- the power unit of the saddle riding type vehicle has been described above.
- the aspect of the present invention is not limited to the above embodiment, and can be implemented in various aspects within the scope of the gist of the present invention. Is included.
- the split end face is formed to have an angle, but the present invention is not limited to this, and various shapes can be employed.
- As the shape of the divided end face it is desirable to have the front end shape of the duct cover rear side portion along the rear end shape of the duct cover front main portion. By adopting such a shape, the duct cover front main portion is formed. And the duct cover rear portion can have a sense of unity, and the appearance can be improved.
- Case cover rear part (rear exposed part), 60ru ... Upper extension part (upper exposed part), 60rl ... Lower side Extension part (lower exposed part), 60v: fitting recess, 60A: innermost part, 60B ... front concave part, 60C ... rear concave part, 60D ... outermost part (case cover exposed part), 61 ... cooling air Inlet, 63 ... Cylindrical mounting boss, 64 ... Central cylindrical mounting boss, 70 ... inner duct member, 70f ... case cover facing part, 70b ... upward bulging part, 71 ... cooling air introduction hole, 73 ... cylindrical mounting boss part, 80 ... Air guide duct cover, 80f ... Main part on the front side of the duct cover, 80b ...
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- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
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Abstract
Description
このパワーユニットのベルト式無段変速機を収容するベルト室は、変速機ケースカバーの前部に形成された冷却風導入口から冷却風が導入されてベルト式無段変速機が冷却される。
導風ダクトカバーは、変速機ケースカバーの前側部分のみを覆っているので、メインスタンドが起立状態から格納状態に揺動し、脚部が変速機ケースの下面に沿って倒伏すると、脚部から延出する操作用アームは、導風ダクトカバーにより覆われない後方の露出した変速機ケースカバーの外側面に沿って上方に延び、先端の足掛け部は変速機ケースカバーの上縁近傍に位置する。
足掛け部は変速機ケースカバーの車幅方向外側方に近接して位置するので、メインスタンドを起立させるときに、乗員の足が露出した変速機ケースカバーに当たりやすく、金属製の変速機ケースカバーの塗装面が傷ついてしまった場合は、傷が目立ち、外観を損ねる可能性がある。
内燃機関とベルト式無段変速機とが一体的に構成されて鞍乗型車両に搭載されるパワーユニットであって、前記内燃機関のクランク軸を車幅方向に支承するクランクケースに連設されて前記車両の後輪の側方まで延びる変速機ケースと、前記変速機ケースの車幅方向側方を覆い前記変速機ケースとの間に前記ベルト式無段変速機を収容するベルト室を形成し、前部に冷却風を前記ベルト室に導入する冷却風導入口が開口形成された金属製の変速機ケースカバーと、前記変速機ケースカバーの前記冷却風導入口を含む少なくとも前側部分を車幅方向側方から覆い前記冷却風導入口に外気を導く樹脂製の導風ダクトカバーと、前記クランクケースの下部に軸支され、起立して車体を支持する起立位置と前記変速機ケースの下面に沿って倒伏する格納位置との間を揺動するメインスタンドとを備え、前記メインスタンドが格納位置にあるときに、前記メインスタンドの側方に延出した操作部が前記変速機ケースカバーの車幅方向外側方に位置する鞍乗型車両のパワーユニットにおいて、
前記変速機ケースカバーの少なくとも一部は、側面視で外部に露出するとともに、前記導風ダクトカバーは、同導風ダクトカバーの後側のダクトカバー後側部分が前記メインスタンドの格納時の操作部を越える後方位置まで配設されることを特徴とする。
前記導風ダクトカバーは、前記ダクトカバー後側部分を含む全体が着色樹脂で形成されるようにしてもよい。
前記ダクトカバー後側部分は、前記ベルト式無段変速機のベルトが架け渡される前側駆動軸である前記クランク軸と後側従動軸の両中心軸線を含む仮想平面を上下方向で跨ぐ位置に配設されるようにしてもよい。
前記ダクトカバー後側部分は、側面視で前記変速機ケースカバーの上縁と下縁の間の中央に位置し、前記変速機ケースカバーの前記導風ダクトカバーにより覆われない外部に露出するケースカバー露出部位は、前記ダクトカバー後側部分より後方の後側露出部分と、同後側露出部分から前記ダクトカバー後側部分の上下を前方に延出して形成される上側露出部分と下側露出部分とを備えるようにしてもよい。
前記変速機ケースカバーには、前記ダクトカバー後側部分を嵌合するべく車幅方向内側に凹む嵌合凹部が形成されるようにしてもよい。
前記ダクトカバー後側部分は、前記仮想平面を含む部位に車幅方向内側に凹むダクトカバー後側凹部が形成されるようにしてもよい。
前記ダクトカバー後側部分は、前記変速機ケースカバーを前記変速機ケースに締結する締結ボルトにより前記変速機ケースカバーとともに前記変速機ケースに共締めされるようにしてもよい。
前記変速機ケースカバーには、前記ダクトカバー後側部分を嵌合するべく車幅方向内側に凹む嵌合凹部が形成され、前記ダクトカバー後側部分における前記締結ボルトが締結される締結座面は、前記変速機ケースカバーの前記嵌合凹部の底面まで車幅方向内側に凹出して形成された前記ダクトカバー後側部分のボルト挿入凹部の底面に形成されるようにしてもよい。
前記導風ダクトカバーは、前記変速機ケースカバーの前側部分を覆うダクトカバー前側主要部から後方に向けてダクトカバー後側部分が延出して形成されるようにしてもよい。
また、ダクトカバー後側部分を変速機ケースカバーとともに変速機ケースに共締めすることで、導風ダクトカバーを少ない締結ボルトで変速機ケースに確実に取り付けることができる。
前記導風ダクトカバーは、前記変速機ケースカバーの前側部分を覆うダクトカバー前側主要部と、同ダクトカバー前側主要部の後方に分割されて配設された前記ダクトカバー後側部分とから構成されるようにしてもよい。
また、ダクトカバー後側部分を変速機ケースカバーとともに変速機ケースに共締めする構成とすると、共締めする締結ボルトを外すことなく、導風ダクトカバーの前側主要部を取り外すことができ、メンテナンスなどを行うときの整備性が良い。
図1は、本発明を適用した第1の実施の形態のパワーユニットを搭載した鞍乗型車両である自動二輪車1の側面図である。
なお、本明細書の説明において、前後左右の向きは、本実施の形態に係るパワーユニットを搭載した自動二輪車1の直進方向を前方とする通常の基準に従うものとし、図面において、FRは前方を,RRは後方を、LHは左方を,RHは右方を示すものとする。
すなわち車体前部1fのヘッドパイプ2からダウンチューブ3が下方へ延出し、同ダウンチューブ3は下端で水平に屈曲してフロア部1cの下方を後方へ延び、その後端において左右一対のメインパイプ4が連結され、メインパイプ4は該連結部から上方に立ち上がり屈曲して斜め後方に延びている。
一方、車体前部1fにおいては、ヘッドパイプ2に軸支されて上方にハンドル6が設けられ、下方にフロントフォーク7が延びてその下端に前輪8が軸支されている。
内燃機関Eは、単気筒4ストロークの内燃機関であり、クランク軸20(図2参照)を車幅方向に指向させて支承するクランクケース21cからシリンダブロック22,シリンダヘッド23およびシリンダヘッドカバー24が前方に突出して略水平に近い状態にまで大きく前傾している。
Vベルト式無段変速機Tの後端に立設された支持ブラケット16と前記メインパイプ4の後部間にリヤクッション17が介装されている(図1参照)。
一方、シリンダヘッド23の下部から下方に延出した排気管28は、後方へ屈曲し右側に偏って後方に延びて後輪21の右側のマフラ29に連結される。
メインスタンド30は、基端回動軸31から左右一対の脚部32,32が、互いに末広がりに延出しており、左右脚部32,32は連結バー32bで連結されている(図3参照)。
そして、左側の脚部32の先端寄りの部位から左方に操作用アーム33が延出している。
図1においては、メインスタンド30の起立状態を実線で示し、格納状態(脚部32の倒伏状態)を2点鎖線で示しており、図2および図3では、格納状態を示している。
すなわち、メインスタンド30は、基端回動軸31を中心に揺動し、図1に示すように脚部32を起立して車体を支持し、走行時には脚部32を上方に揺動してVベルト式無段変速機Tの下面に沿って略水平に倒伏して格納状態とする。
操作用アーム33の先端には足掛けプレート33aが固着されている。
図5に示されるように、左側の変速機ケース21Tは、前部21Tfから後方に後輪15の側方まで延出している。
パワーユニットPは、内燃機関Eとベルト式無段変速機Tとが一体的に構成されたものである。
駆動プーリ40は、クランク軸20の延長軸部において、左端に嵌着される固定駆動プーリ半体40aと、固定駆動プーリ半体40aの右側で対向して軸方向に摺動可能に軸支される可動駆動プーリ半体40bとからなる。
固定駆動プーリ半体40aと可動駆動プーリ半体40bは、互いに対向してVベルト44を挟む対向テーパ面を有する。
固定駆動プーリ半体40aの背面(左面)には、冷却ファン43の羽根が多数形成されている。
両従動プーリ半体47a,47bに前記Vベルト44が挟まれる。
遠心クラッチ50は、インナスリーブ46aに嵌着されたクラッチインナ51の外周を覆うクラッチアウタ52が減速機入力軸45に嵌着されており、クラッチインナ51にばね51bに抗して遠心方向に揺動するクラッチシュー51sがクラッチアウタ52の内周面に対向して設けられている。
したがって、Vベルト44を介してインナスリーブ46aに伝達された動力は、その回転速度が増すと、クラッチシュー51sがばね51bに抗して遠心方向に揺動してクラッチアウタ52の内周面に接して遠心クラッチ50が接合し、減速機入力軸45に伝達される。
図8に、変速機ケースカバー60の左側面図を示す。同図8および図5を参照して、変速機ケースカバー60は、前側駆動軸であるクランク軸20の左端に嵌着される固定駆動プーリ半体40aに形成される冷却ファン43を左側から覆うケースカバー前側部分60fと、後側従動軸である減速機入力軸45の左端に設けられる遠心クラッチ50を左側から覆うケースカバー後側部分60rと、ケースカバー前側部分60fとケースカバー後側部分60rとを連結するケースカバー中央部分60cとからなり、側面視で前後に長尺の長円状をなしている。
同図5に示されるように、前側の駆動プーリ40と後側の従動プーリ47とは、Vベルト44が架渡されることから車幅方向で同じ位置にあり、後側において遠心クラッチ50は従動プーリ47より左側に位置する。
そのため、変速機ケースカバー60は、駆動プーリ40および冷却ファン43を覆うケースカバー前側部分60fより遠心クラッチ50を覆うケースカバー後側部分60rが車幅方向外側に膨出している(図5参照)。
ケースカバー前側部分60fには、冷却風をベルト室55に導入する冷却風導入口61が大きく開口形成されている。
そして、最外側部位60Dのケースカバー後側部分60rから前方に上下二股に分かれて延びた上側延伸部60ruと下側延伸部60rlの間に車幅方向内側に凹む嵌合凹部60vが形成されている。
嵌合凹部60vは、前後で凹部の凹入深さ(車幅方向位置)が異なり、前側の前側凹部位60B(図8において最内側部位60Aより粗い格子ハッチが施されている部分)と後側の後側凹部位60C(図8において前側凹部位60Bよりさらに粗い格子ハッチが施されている部分)の車幅方向位置は、いずれも最内側部位60Aと最外側部位60Dとの間にあり、最内側部位60A,前側凹部位60B,後側凹部位60C,最外側部位60Dは、この順に、車幅方向で左外側に位置する(図5参照)。
変速機ケースカバー60のケースカバー前側部分60fには、中央の大きな冷却風導入口61の周りに、3本の円筒取付ボス部63が、左方(車幅外方向)に突出して形成されている。
3本の円筒取付ボス部63は、1本が冷却風導入口61の前方に、他の2本が冷却風導入口61の斜め上下後方に形成されている。
円筒取付ボス部63には、ねじ孔が形成されている。
中央円筒取付ボス部64は、車幅方向内側(左側)に若干突出している。
なお、側面視で長円状をなす変速機ケースカバー60の外周縁には、変速機ケースカバー60を変速機ケース21Tに結合するための取付ボス部65が複数形成されている。
したがって、図4に示されるように、変速機ケースカバー60に導風ダクトカバー80(図中で散点模様が施された部材)が被せられると、変速機ケースカバー60は最外側部位60Dのみが外部に露出する。
内側ダクト部材70および導風ダクトカバー80は樹脂製である。
内側ダクト部材70の左側面には、変速機ケースカバー60の3本の円筒取付ボス部63にそれぞれ対応して同円筒取付ボス部63が嵌入する円筒取付ボス部73が車幅方向外側(左側)に突出して形成されている。
円筒取付ボス部73の端部は環状の底壁73bを有している。
同導風凹状リブ75は、図9に示されるように、円孔71の外周を上部から順に前部、下部、後部と4分の3周程取り巻いた後に、円孔71の斜め上後方を開放して上方に延び、屈曲して上方膨出部70bの上縁部に沿って前方に向かい、前縁部に沿って屈曲して下方に延びている。
該ダクトカバー後側部分80rは、変速機ケースカバー60の嵌合凹部60vに対向して嵌合すべく、後方に向かって上下幅が徐々に小さくなる先細に形成されている。
また、ダクトカバー後側部分80rの後半部分に、車幅方向内側(右側)に若干凹んだダクトカバー後側凹部80rdが形成されている(図3参照)。
ダクトカバー後側凹部80rdは、ダクトカバー後側部分80rの仮想平面Liを含む中央の部位(仮想平面Liを上下方向で跨ぐ部位)に横長の長方形状に形成されている(図4参照)。
なお、このダクトカバー後側部分80rにおけるダクトカバー後側凹部80rdの凹みはなくてもよい。
突出した取付円筒部83の端部の環状の底壁83bは、対向する円筒取付ボス部73の環状の底壁73bに当接する。
取付円筒部83の端部の環状の底壁83bが、ボルト挿入凹部83dの底面を構成し、締結ボルト91の締結座面83bsとなる。
突出した中央取付円筒部84の端部の環状の底壁84bは、対向する中央円筒取付ボス部64の端部に当接する。
中央取付円筒部84の端部の環状の底壁84bが、ボルト挿入凹部84dの底面を構成し、締結ボルト92の締結座面84bsとなる。
導風ダクトカバー80の外気取入部80bには、外気取入口81が前方に寄って開口しており、外気取入口81には外気を案内するとともに異物の侵入を防止するルーバー82が設けられている。
導風ダクトカバー80は、ダクトカバー後側部分80rを含む全体が着色樹脂で形成されている。
図5を参照して、変速機ケース21Tに変速機ケースカバー60を取り付けたとき、変速機ケースカバー60の中央円筒取付ボス部64に対向して変速機ケース21Tの左側面から突出した取付ボス部21bの端面に、変速機ケースカバー60側の中央円筒取付ボス部64の端面が当接する。
取付ボス部21bの端面にはねじ孔が形成されている。
ケースカバー前側部分60fに突出形成された3本の円筒取付ボス部63が内側ダクト部材70の円筒取付ボス部73にそれぞれ嵌入するように位置決めして、変速機ケースカバー60に内側ダクト部材70を重ね合わせると、変速機ケースカバー60の口縁凸状リブ62と内側ダクト部材70の口縁凹状リブ72とがシール部材68を介在させて嵌合し、変速機ケースカバー60の冷却風導入口61と内側ダクト部材70の冷却風導入孔71が合致して連通する。
内側ダクト部材70の導風凹状リブ75に、シール部材78を介在させて導風ダクトカバー80の導風凸状リブ85を嵌合し、変速機ケースカバー60の嵌合凹部60vに導風ダクトカバー80のダクトカバー後側部分80rを嵌合して、内側ダクト部材70と変速機ケースカバー60に導風ダクトカバー80を嵌め合わせる。
そして、ケースカバー後側部分60r,上側延伸部60ru,下側延伸部60rlは、それぞれ後側露出部分60r,上側露出部分60ru,下側露出部分60rlとなる(図4参照)。
取付円筒部83のボルト挿入凹部83dの底面が、締結ボルト91の締結座面83bsとなるので、締結ボルト91は、ボルト頭部がボルト挿入凹部83dに没入して変速機ケースカバー60の円筒取付ボス部63のねじ孔に近づくため、短い締結ボルトを使用することができる。
導風ダクトカバー80のダクトカバー後側部分80rは、変速機ケースカバー60の仮想平面Liを上下方向で跨ぐ位置にある嵌合凹部60vに嵌合し、よって、ダクトカバー後側部分80rは、仮想平面Liを上下方向で跨ぐ位置にある。
さらに、ダクトカバー後側部分80rの仮想平面Liを含む部位には、車幅方向内側に凹んだダクトカバー後側凹部80rdが形成されていて、ダクトカバー後側部分80rの車幅方向外側への突出が一層抑制されている(図3,図7参照)。
図2に示されるように、格納状態のメインスタンド30の操作用アーム33は、変速機ケースカバー60の下面に沿って倒伏した脚部32から変速機ケースカバー60の前後方向中央部の後寄りの位置を下面から左側面に沿って湾曲して上方に延びており、その先端の足掛けプレート33aは、変速機ケースカバー60の上縁に届く位置にある。
斯かる位置にある足掛けプレート33aに、乗員が足を掛けて踏込んでメインスタンド30を起立させるとき、乗員の足は、変速機ケースカバー60の外側面に沿って仮想平面Liを横切って下方に踏み込まれる。
さらに、ダクトカバー後側部分80rの仮想平面Liを含む部位が凹んでダクトカバー後側凹部80rdが形成されているので、乗員の足が接触するのを益々抑制することができる(図3参照)。
また、ダクトカバー後側部分80rを変速機ケースカバー60とともに変速機ケース21Tに共締めすることで、導風ダクトカバー80を少ない締結ボルトで変速機ケースに確実に取り付けることができる。
第2の実施の形態の第1の例のパワーユニットP1の左側面図を、図12に示す。
なお、ダクトカバー前側主要部100fには外気取入部100b,上縁延伸部100fu,下縁延伸部100frが形成されており、図12に示されるように、ダクトカバー前側主要部100fとダクトカバー後側部分100rが連設された状態は、前記第1の実施の形態の導風ダクトカバー80と同じ形状をしている。
また、導風ダクトカバー100全体の形状を変えることなく、分割端面100fe,100reの形状を変えることで、多様な外観を形成することができる。
第2の変形例のパワーユニットP2の本導風ダクトカバー110は、着色樹脂製であり、ダクトカバー後側部分110rがダクトカバー前側主要部110fから後方に離れて分離して配設されている。
図13に示されるように、互いに離れた分割端面110fe,110reの間に変速機ケースカバー60が覗き見える特徴ある外観を構成することができる。
なお、ダクトカバー前側主要部110fとダクトカバー後側部分110rの互いに離れた分割端面110fe,110reの間に変速機ケースカバー60が部分的に膨出して、その膨出表面がダクトカバー前側主要部110fおよびダクトカバー後側部分110rと同一表面をなすようにしてもよい。
第3の変形例のパワーユニットP3の本導風ダクトカバー120は、着色樹脂製であり、ダクトカバー前側主要部120fとダクトカバー後側部分120rが別体で構成されるが、一部重なって配設される。
共締めする締結ボルト92を外すことなく、ダクトカバー前側主要部100fを取り外すことができ、メンテナンスなどを行うときの整備性が良い。
また、第2、第3の変形例では、分割端面を角度をなすように形成したが、これに限らず様々な形状を採用することができる。
分割端面の形状としては、ダクトカバー前側主要部の後端形状に沿ったダクトカバー後側部分の前端形状を有していることが望ましく、このような形状とすることで、ダクトカバー前側主要部とダクトカバー後側部分とで一体感を持った形状とすることができ、外観性も良好なものとすることができる。
1…自動二輪車、20…クランク軸(前側駆動軸)、21R…右側クランクケース、21T…変速機ケース、21c…クランクケース、
30…メインスタンド、32…脚部、33…操作用アーム、
40…駆動プーリ、43…冷却ファン、44…Vベルト、45…減速機入力軸(後側従動軸)、47…従動プーリ、55…ベルト室、
60…変速機ケースカバー、60f…ケースカバー前側部分、60c…ケースカバー中央部分、60r…ケースカバー後側部分(後側露出部分)、60ru…上側延伸部(上側露出部分)、60rl…下側延伸部(下側露出部分)、60v…嵌合凹部、60A…最内側部位、60B…前側凹部位、60C…後側凹部位、60D…最外側部位(ケースカバー露出部位)、61…冷却風導入口、63…円筒取付ボス部、64…中央円筒取付ボス部、
70…内側ダクト部材、70f…ケースカバー対向部、70b…上方膨出部、71…冷却風導入孔、73…円筒取付ボス部、
80…導風ダクトカバー、80f…ダクトカバー前側主要部、80b…外気取入部、80r…ダクトカバー後側部分、81…外気取入口、83…取付円筒部、83d…ボルト挿入凹部、84…中央取付円筒部、84d…ボルト挿入凹部、84bs…締結座面、
90,91,92…締結ボルト、
P1…パワーユニット、100…導風ダクトカバー、100f…ダクトカバー前側主要部、100fe…分割端面、100r…ダクトカバー後側部分、100re…分割端面、
P2…パワーユニット、110…導風ダクトカバー、110f…ダクトカバー前側主要部、110fe…分割端面、110r…ダクトカバー後側部分、110re…分割端面、
P3…パワーユニット、120…導風ダクトカバー、120f…ダクトカバー前側主要部、120fe…分割端面、120r…ダクトカバー後側部分、120re…分割端面。
Claims (10)
- 内燃機関(E)とベルト式無段変速機(T)とが一体的に構成されて鞍乗型車両に搭載されるパワーユニット(P)であって、
前記内燃機関(E)のクランク軸(20)を車幅方向に支承するクランクケース(21c)に連設されて前記車両の後輪の側方まで延びる変速機ケース(21T)と、
前記変速機ケース(21T)の車幅方向側方を覆い前記変速機ケース(21T)との間に前記ベルト式無段変速機(T)を収容するベルト室(55)を形成し、前部に冷却風を前記ベルト室(55)に導入する冷却風導入口(61)が開口形成された金属製の変速機ケースカバー(60)と、
前記変速機ケースカバー(60)の前記冷却風導入口(61)を含む少なくとも前側部分を車幅方向側方から覆い前記冷却風導入口に外気を導く導風ダクトカバー(80)と、
前記クランクケース(21c)の下部に軸支され、起立して車体を支持する起立位置と前記変速機ケース(21T)の下面に沿って倒伏する格納位置との間を揺動可能のメインスタンド(30)とを備え、
前記メインスタンド(30)が格納位置にあるときに、前記メインスタンド(30)の側方に延出した操作部(33)が前記変速機ケースカバー(60)の車幅方向外側方に位置する鞍乗型車両のパワーユニットにおいて、
前記変速機ケースカバー(60)の少なくとも一部は、側面視で外部に露出するとともに、
前記導風ダクトカバー(80)は、同導風ダクトカバー(80)の後側のダクトカバー後側部分(80r)が前記メインスタンド(30)の格納時の操作部(33)を越える後方位置まで配設されることを特徴とする鞍乗型車両のパワーユニット。 - 前記導風ダクトカバー(80)は、前記ダクトカバー後側部分(80r)を含む全体が着色樹脂で形成されることを特徴とする請求項1記載の鞍乗型車両のパワーユニット。
- 前記ダクトカバー後側部分(80r)は、前記ベルト式無段変速機(T)のベルトが架け渡される前側駆動軸である前記クランク軸(20)と後側従動軸(45)の両中心軸線を含む仮想平面(Li)を上下方向で跨ぐ位置に配設されることを特徴とする請求項1または請求項2記載の鞍乗型車両のパワーユニット。
- 前記ダクトカバー後側部分(80r)は、側面視で前記変速機ケースカバー(60)の上縁と下縁の間の中央に位置し、
前記変速機ケースカバー(60)は、前記導風ダクトカバー(80)により覆われない外部に露出するケースカバー露出部位(60D)を有し、該ケースカバー露出部位(60D)は、前記ダクトカバー後側部分(80r)より後方の後側露出部分(60r)と、同後側露出部分(60r)から前記ダクトカバー後側部分の上下を前方に延出して形成される上側露出部分(60ru)と下側露出部分(60rl)とを備えることを特徴とする請求項3記載の鞍乗型車両のパワーユニット。 - 前記変速機ケースカバー(60)には、前記ダクトカバー後側部分(80r)を嵌合するべく車幅方向内側に凹む嵌合凹部(60v)が形成されることを特徴とする請求項4記載の鞍乗型車両のパワーユニット。
- 前記ダクトカバー後側部分(80r)は、前記仮想平面(Li)を含む部位に車幅方向内側に凹むダクトカバー後側凹部(80rd)が形成されることを特徴とする請求項3ないし請求項5のいずれか1項記載の鞍乗型車両のパワーユニット。
- 前記ダクトカバー後側部分(80r)は、前記変速機ケースカバー(60)を前記変速機ケース(21T)に締結する締結ボルト(92)により前記変速機ケースカバー(60)とともに前記変速機ケース(21T)に共締めされることを特徴とする請求項3ないし請求項6のいずれか1項記載の鞍乗型車両のパワーユニット。
- 前記変速機ケースカバー(60)には、前記ダクトカバー後側部分(80r)を嵌合するべく車幅方向内側に凹む嵌合凹部(60v)が形成され、
前記ダクトカバー後側部分(80r)は、前記締結ボルト(92)が締結される締結座面(84bs)を有し、該締結座面(84bs)は、前記変速機ケースカバー(60)の前記嵌合凹部(60v)の底面まで車幅方向内側に凹出して形成された前記ダクトカバー後側部分(80r)のボルト挿入凹部(84d)の底面に形成されることを特徴とする請求項7記載の鞍乗型車両のパワーユニット。 - 前記導風ダクトカバー(80)は、前記変速機ケースカバー(60)の前側部分を覆うダクトカバー前側主要部(80f)から後方に向けて前記ダクトカバー後側部分(80r)が延出して形成されることを特徴とする請求項1ないし請求項8のいずれか1項記載の鞍乗型車両のパワーユニット。
- 前記導風ダクトカバー(80)は、前記変速機ケースカバー(60)の前側部分を覆うダクトカバー前側主要部(80f)と、同ダクトカバー前側主要部(80f)の後方に分割されて配設された前記ダクトカバー後側部分(80r)とから構成されることを特徴とする請求項1ないし請求項8のいずれか1項記載の鞍乗型車両のパワーユニット。
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