CN109563764A - Air-cooled internal combustion engine - Google Patents
Air-cooled internal combustion engine Download PDFInfo
- Publication number
- CN109563764A CN109563764A CN201780047836.9A CN201780047836A CN109563764A CN 109563764 A CN109563764 A CN 109563764A CN 201780047836 A CN201780047836 A CN 201780047836A CN 109563764 A CN109563764 A CN 109563764A
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- China
- Prior art keywords
- air
- cylinder body
- fan
- exhaust
- cooling
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
- F01P5/06—Guiding or ducting air to, or from, ducted fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
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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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/02—Cylinders; Cylinder heads having cooling means
- F02F1/04—Cylinders; Cylinder heads having cooling means for air cooling
- F02F1/06—Shape or arrangement of cooling fins; Finned cylinders
- F02F1/065—Shape or arrangement of cooling fins; Finned cylinders with means for directing or distributing cooling medium
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
There is provided a kind of air-cooled internal combustion engine, wherein cylinder body and cylinder cap can be cooled down thoroughly, and can efficiently cool down the extension of the exhaust pipe extended from the very big cylinder cap of calorific value.The present invention provides a kind of air-cooled internal combustion engine, wherein, Centrifugal Cooling Fan 56 is fixed to an axial end of crankshaft 21, and cylinder body 23 and cylinder cap 24 are surrounded by shield 70, in which: multiple air guidance cooling fins 82 are arranged in parallel on the exhaust side cylinder body side surface 23D of cylinder body 23；Air guiding groove 83 is formed between adjacent air guidance cooling fins 82；And, in multiple air guiding grooves 83, entrance 83i is open upwards in the side of the fan side side edge 23Dr towards exhaust side cylinder body side surface 23D, and outlet 83e is open upwards towards the side of exhaust side cylinder cap side surface 24D, and entrance 83i is allowed to be connected to outlet 83e.
Description
Technical field
The present invention relates to a kind of air-cooled internal combustion engines, wherein cooling air stream is by being directly connected to the cooling wind of crankshaft
Fan is sent into shield, thus cooling cylinder body and cylinder cap.
Background technique
It is well known that air-cooled internal combustion engine has the cylinder body and cylinder cap surrounded by shield, wherein by being fixed to crankshaft
Cooling air stream is sent into shield by the rotation of the cooling fan of end, for cooling down cylinder body and cylinder cap, for example, such as patent document
Described in 1.
[existing technical literature]
[patent document]
[patent document 1] JP H7-253019 A
Air-cooled internal combustion engine disclosed in Patent Document 1 is mounted on two-wheeled motor vehicle, and crankshaft is in left and right or vehicle width direction
Upper orientation, and cylinder body and cylinder cap are extended forward with the state successively stacked from crankcase.Air inlet pipe from the uper side surface of cylinder cap to
Upper extension, exhaust pipe are extended downwardly from the downside surface of cylinder cap.Centrifugal Cooling Fan is fixed to the right end of crankshaft.
Cylinder body and cylinder cap are surrounded by shield, are connected to shield from the fan cover of cross side covering Centrifugal Cooling Fan, and
Cooling air stream is sent into shield by Centrifugal Cooling Fan, to cool down cylinder body and cylinder cap.The left-hand face of cylinder body and downside
Surface is formed with the cooling fins being orientated in a circumferential direction, and the right lateral surface for being provided with Centrifugal Cooling Fan is formed with forward
With reclinate cooling fins, also, uper side surface is formed with inclined cooling fins, so as to curved cooling fins one
It rises and forms V-arrangement.
Therefore, the major part of the cooling air stream generated by the rotation of Centrifugal Cooling Fan passes through shield from fan cover quilt
Guidance, to be sent to the upper area of the right lateral surface of cylinder body, and is divided into the flowing along uper side surface and the right side along cylinder body
The flowing of side surface.The cooling air stream (it is separated towards the uper side surface of cylinder body) of side is guided by inclined cooling fins,
To circulate from the uper side surface of cylinder cap to left-hand face, and further downside surface is arrived in circulation.Cooling air stream (its of the other side
Separated towards the right lateral surface of cylinder body) downside surface of cylinder body is sent to by inclined cooling fins, and by circumference side
The cooling fins being upwardly oriented flow it near downside surface towards the left-hand face of cylinder body, arrive left-hand face with circulation.
Summary of the invention
[technical problem]
In patent document 1 in disclosed air-cooled internal combustion engine, pass through the cooling of the rotation generation of Centrifugal Cooling Fan
Air stream is as described above by cool down cylinder body and cylinder cap.However, the extension of the exhaust pipe from biggish cylinder cap extension of generating heat
Part is located at the downside surface of cylinder cap, cooled by following procedure, wherein to be sent to the cooling air of the uper side surface of cylinder body
Stream circulates from uper side surface to left-hand face, and further arrives the downside surface of cylinder cap.Therefore, cooling air stream reaches exhaust
The extension institute travel distance of pipe is long, and the cooling air stream institute that extension is heated up by the heating during advancing
It is cooling.Therefore, it is necessary to a kind of structures of more effectively extension of cooled exhaust pipe.
In consideration of it, completing the present invention.Therefore, the purpose of the present invention is to provide a kind of air-cooled internal combustion engine,
It can thoroughly cool down cylinder body and cylinder cap, and can particularly efficiently cool down the exhaust extended from the very big cylinder cap of calorific value
The extension of pipe.
[technological means]
To achieve the goals above, according to the present invention, a kind of air-cooled internal combustion engine is provided, in which: be provided with cooling fins
Cylinder body and cylinder cap in a manner of successively stacking from the crankcase of crankshaft is pivotably supported in the side of the axis perpendicular to crankshaft
It upwardly extends；Centrifugal Cooling Fan is fixed to one end of crankshaft；Air inlet pipe and exhaust pipe are in opposite the upper side and lower side from cylinder
The side surface of lid extends；Cylinder body and cylinder cap are surrounded by shield；Also, connect from the fan cover of cross side covering Centrifugal Cooling Fan
It is connected to shield, so that cooling air stream is sent into shield by Centrifugal Cooling Fan, to cool down cylinder body and cylinder cap；
It is characterized by:
The exhaust side cylinder body side surface of the cylinder body and exhaust side cylinder cap side surface are continuous, which is
The downside surface of the cylinder cap, the exhaust pipe extend from the downside surface, and exhaust side cylinder body side surface is provided with flat
Multiple air of row arrangement guide cooling fins, and air guiding groove is formed between adjacent air guidance cooling fins；And
Respectively there is a structure by the multiple air guiding groove (83) that air guidance cooling fins are formed,
In, entrance is open upwards in the side of the fan side side edge towards exhaust side cylinder body side surface, the fan side side edge
It is located at same side with the end of the fixation Centrifugal Cooling Fan of the crankshaft, also, the air guiding groove respectively has
There is outlet, the outlet is open upwards towards the side of exhaust side cylinder cap side surface, each in the air guiding groove
It is a to be communicated to the outlet from the entrance.
According to this structure, the fan side of cylinder body is sent to by the cooling air stream that the rotation of Centrifugal Cooling Fan generates
Cylinder body side surface, and be further sent to and the side surface of the continuous cylinder cap in fan side cylinder body side surface (fan side cylinder cap side table
Face), and make the major part for the cooling air stream for being sent to fan side cylinder body side surface bypass fan side edge by shield
From fan side cylinder body side surface circulate to exhaust side cylinder body side surface, thus be directed on exhaust side cylinder body side surface by
The entrance for the air guiding groove that air guides cooling fins to be formed, to be directed into air guiding groove and be flowed out to by outlet
Exhaust side cylinder cap side surface.Therefore, cooling air stream blows to the extension of the exhaust pipe extended from exhaust side cylinder cap side surface,
Thus, it is possible to especially actively and efficiently cool down the extension of the very big exhaust pipe of calorific value.
In addition, being sent to one of the cooling air stream of the fan side cylinder cap side surface of fan side cylinder body side surface and cylinder cap
Divide the side surface for flowing to the air inlet pipe side of cylinder body and cylinder cap, and further the side table of the side opposite with fan side is arrived in circulation
Face.Therefore, cylinder body and cylinder cap are thoroughly cooled down.
In above-mentioned configuration, air guidance cooling fins can be bent camber, and air guiding groove can from entrance to
Exit bend camber.
Since the air guiding groove of exhaust side cylinder body side surface is bent camber from the inlet to the outlet, limit to drawing
The resistance of the cooling air stream of entrance, and by changing flow direction, cooling air stream can be flowed glibly by outlet
Out, so as to the extension of cooled exhaust pipe with higher efficiency.
In above-mentioned configuration, the air guidance cooling fins with upstream end thereof part may include with upstream end thereof portion
The outermost air divided guides cooling fins, farthest from cylinder cap, and is located at the exhaust side cylinder body side surface of crankcase side
End edge at, and outermost air guidance cooling fins can have positioned at the exhaust side cylinder body side surface of cylinder cap side
End edge at downstream end part.
According to this configuration, the outermost air in multiple air guidance cooling fins guides cooling fins (its upstream end
Portion part is farthest away from cylinder cap) upstream end portion be located at crankcase side the end edge of exhaust side cylinder body side surface on,
Downstream end portion is located in the end edge of exhaust side cylinder body side surface of cylinder cap side.Therefore, from fan side cylinder body side surface
The cooling air stream to circulate to exhaust side cylinder body side surface can guide cooling fins efficiently to be drawn by outermost air
Enter, while reducing leakage, and cooling air stream can be made to guide the air guiding groove of cooling fins to flow out by multiple air
To exhaust side cylinder cap side surface.Therefore, prolonging for the exhaust pipe extended from exhaust side cylinder cap side surface can more efficiently be cooled down
Extending portion point.
In above-mentioned configuration, the air guidance cooling fins except outermost air guidance cooling fins be can have
End sections are swum, are spaced apart scheduled distance with the fan side side edge of exhaust side cylinder body side surface respectively.
According to this configuration, the air guidance cooling fins except outermost air guidance cooling fins can make thereon
Trip end sections are spaced apart scheduled distance with the fan side side edge of exhaust side cylinder body side surface respectively.Therefore, exhaust side cylinder
Body side surface forms the space having there is no cooling fins in the side of fan side side edge, and the space is by outermost air
Cooling fins are guided to surround.Therefore, exhaust side cylinder body side table is flow to from fan side cylinder body side surface around fan side side edge
The cooling air stream in face can efficiently enter the space, and can flow into curved air guiding groove.Therefore, exhaust pipe
Extension can cool down with higher efficiency.
In above-mentioned configuration, fan side cylinder body side surface is the end with the fixation Centrifugal Cooling Fan of crankshaft of cylinder body
Positioned at the side surface of same side, cooling fins can not be formed except the region of cylinder cap side.
Cooling is not formed outside the region of cylinder cap side on the fan side cylinder body side surface of cylinder body according to this arrangement
Fin.It therefore, can be efficiently by the cooling air stream that the rotation of Centrifugal Cooling Fan is sent to fan side cylinder body side surface
Into in the space on the fan side cylinder body side surface for not forming cooling fins.Air-flow can be made along fan side cylinder body side
The part flowing for not forming cooling fins on surface, and it is flow to exhaust side cylinder body side surface around fan side side edge, make
It can be introduced into the extension of exhaust pipe in air guiding groove and can be blown to enough to the cooling air stream of amount, so as to
The extension of cooled exhaust pipe with higher efficiency.
In above-mentioned configuration, the exhaust side inner surface of the exhaust side cylinder body side surface towards cylinder body of shield be could be formed with
Air guiding rib extends along the air guiding groove formed by air guidance cooling fins.
According to this configuration, the exhaust side inner surface of shield is also formed with air guiding rib, cold along being guided by air
But the air guiding groove that fin is formed extends.Therefore, the air guiding rib of cooling fins and shield is guided by the air of cylinder body
Cooperation, the cooling air stream to have circulated to exhaust side cylinder body side surface can guide by shield, can make its row of flowing out to
Gas side cylinder cap side surface, and can be blown out towards the extension of exhaust pipe.Therefore, it can be guided with multiple air of economization cylinder body
Cooling fins, the fire check to be conducive to the formation of cylinder body, and when can prevent from being formed.
In above-mentioned configuration, air guiding rib and air guidance cooling fins interlaced with each other can be arranged.
According to this configuration, air guiding rib and air guide cooling fins arrangement interlaced with each other, as a result, air guiding rib
Cooling fins can be guided effectively to arrange relative to air.
In above-mentioned configuration, the air guidance partition wall for cooling air stream to be separately directed to cylinder cap and cylinder body can be with
It is formed in the inside of the lateral parts of the connection fan cover of shield.
According to this configuration, divided by the cooling air stream of the rotation supply of Centrifugal Cooling Fan by air guidance partition wall
It opens, and is substantially directed separately to cylinder body and cylinder cap.Therefore, only it is sent to the cooling empty of the fan side cylinder body side surface of cylinder body
Air-flow is ensured that sufficiently, without flowing to cylinder cap side.This adequate amount of cooling air stream circulates to exhaust side cylinder body side
Surface, and the extension of exhaust pipe is blown to by air guiding groove, so as to improve cooling effect.
[beneficial effect]
According to the present invention, the air that the exhaust side cylinder body side surface of cylinder body is formed with multiple parallel arrangements guides cooling wing
Piece, and the air guiding groove being formed between adjacent air guidance cooling fins has following structure, wherein and entrance is in court
It is open upwards, is exported in the direction towards exhaust side cylinder cap side surface to the side of the fan side side edge of exhaust side cylinder body side surface
It is upper to open wide, also, air guiding groove is communicated to outlet from entrance.
Therefore, the fan side cylinder body side table of cylinder body is sent to by the cooling air stream that the rotation of Centrifugal Cooling Fan generates
Face, and be further sent to the side surface of the continuous cylinder cap in fan side cylinder body side surface (fan side cylinder cap side surface), also, by
Shield promotes the major part for being sent to the cooling air stream of fan side cylinder body side surface to surround fan side side edge from fan side cylinder
Body side surface flow to exhaust side cylinder body side surface, guides cooling wing with the air being directed on exhaust side cylinder body side surface
The entrance for the air guiding groove that piece is formed, to be directed into air guiding groove and flow out to exhaust side cylinder cap side table by outlet
Face.Therefore, cooling air stream blows to the extension of the exhaust pipe extended from exhaust side cylinder cap side surface, it is possible thereby to especially long-pending
Pole and the extension for effectively cooling down the very big exhaust pipe of calorific value.
In addition, being sent to one of the cooling air stream of the fan side cylinder cap side surface of fan side cylinder body side surface and cylinder cap
Divide the side surface for flowing to the air inlet pipe side of cylinder body and cylinder cap, and further arrives opposite with fan side one by shield guidance circulation
The side surface of side.Therefore, cylinder body and cylinder cap are thoroughly cooled down.
Detailed description of the invention
Fig. 1 is the overall right side view of two-wheeled motor vehicle, is equipped in the air-cooled type of embodiment according to the present invention thereon
Combustion engine；
Fig. 2 is mounted in the left view of the power unit on two-wheeled motor vehicle；
Fig. 3 is the right side view of power unit；
Fig. 4 is the front view of power unit；
Fig. 5 is the bottom view of the lower part of the internal combustion engine of power unit；
Fig. 6 is bottom view, wherein a part of internal combustion engine is shown with section, and has cut off shield；
Fig. 7 is the right side view of internal combustion engine, wherein fan cover and shield are cut off；
Fig. 8 is the perspective view of cylinder body；
Fig. 9 is the bottom view of cylinder body；And
Figure 10 is the cross-sectional view along the arrow X-X of Fig. 5 cylinder body and shield intercepted.
Specific embodiment
The embodiment of the present invention is described below with reference to Fig. 1 to 9.
The pedal-type two-wheel motorcycle 1 being equipped with thereon according to the air-cooled internal combustion engine of the present embodiment is shown in FIG. 1.
Note that this paper forward, backward, to the left, to the right, upward and downward direction meet common standard, wherein with this
The straight ahead direction of the related two-wheeled motor vehicle 1 of embodiment is forward direction；Therefore, in the accompanying drawings, FR indicates front side, RR table
Show that rear side, LH indicate left side, RH indicates right side, and UP indicates upside, and DW indicates downside.
Vehicle foreside 1F and body tail 1R is interconnected by lower plate part 1C, and the body shell for constituting body frame is big
It causes to be made of down tube 3 and supervisor 4.
Specifically, down tube 3 is extended downwardly from the head tube 2 of vehicle foreside 1F, down tube 3 its lower ends bent at horizontal and
It extends back below bottom parts 1C, a pair of of left and right pipe 4 is connected to the rear end of down tube 3, and supervisor 4 is formed from coupling part backward
The sloping portion 4a that inclined upward extends, the top of sloping portion 4a are further bent to form horizontal component 4b, the horizontal part
4b is divided essentially horizontally to extend towards rear side.
Between a pair of supervisor 4, containing box 5 and fuel tank 6 are supported on front side and rear side, and seat 7 is disposed over
The upside of containing box 5 and fuel tank 6.
On the other hand, at vehicle foreside 1F, the setting of handle 8 is rotatably supported in upside, while by head tube 2, front fork 9
It extends downwardly, front-wheel 10 is pivotally supported at the lower end of front fork 9.
Support bracket 11 is arranged at the front end portion of supervisor 4 in a manner of rearwardly projecting, and power unit P passes through company
Bar component 12 is pivotably connected Support bracket 11 and is supported by Support bracket 11.
Its front is provided with single-cylinder four-stroke air-cooled internal combustion engine 20 referring to Fig. 2 and Fig. 3, power unit P.Internal combustion engine 20
Cylinder body 23, cylinder cap 24 and cylinder cap covering 25 is set as to stack from crankcase 22 in order, and with relative to horizontality with compared with
The posture that big degree turns forward forward extends out, and crankshaft 21 is supported in the orientation of crankcase 22 in the vehicle width direction.From song
The end sections of the lower part of axle box 22 a pair of left and right engine suspension frame 22h outstanding forward are connected to link component by pivot 13
12。
Referring to Fig. 6, this is bottom view, wherein a part of internal combustion engine 20 is shown with section, and shield is removed, bent
Axle box 22 is made of the left crankcase part 22L and right crankcase part 22R for being divided into the left and right sides.It takes in the vehicle width direction
To crankshaft 21 be pivotally supported on left crankcase part 22L and right crankcase part 22R by base bearing 21b respectively.
Exchange (AC) generator 55 is arranged at the right side shaft portion of crankshaft 21, also, 56 one of Centrifugal Cooling Fan
Ground is installed to the outer rotor 55r of AC generator 55.
Centrifugal Cooling Fan 56 is accommodated wherein from the fan cover 57 of right side covering right crankcase part 22R.
Fan cover 57 is formed with grid 57g towards Centrifugal Cooling Fan 56, and grid 57g is outside air inlet.
Referring to Fig. 6, left crankcase part 22L extends back with while being used as transmission components, and gear shift cover 65 is from left side
Transmission components (left crankcase part) 22L is covered, also, Belt-type Adjustable-speed speed changer 60 is provided at its inner portion.
At the left side shaft portion of crankshaft 21, drive sprocket 58 is arranged near base bearing 21b, and in left-hand axis end
At part, it is provided with the driving pulley 61 of Belt-type Adjustable-speed speed changer 60.
By winding the cam chain 59 of drive sprocket 58, power is passed to the valve activator on the side of cylinder cap 24.
Referring to fig. 2, the reduction gearing output shaft of the deceleration mechanism 64 of the rear side of Belt-type Adjustable-speed speed changer 60 is set
It is rear axle 28a, and rear-wheel 28 is arranged on rear axle 28a (see Fig. 2).
Posterior bumper 19 is plugged in the upper end for accommodating the rear portion of transmission case body portion 22L of deceleration mechanism 64 and supervisor 4
Upper bending part between.
The reduction gearing that the driven pulley 63 of Belt-type Adjustable-speed speed changer 60 is pivotally supported at deceleration mechanism 64 is defeated
Enter on axis 64a, and band 62 is wrapped on the driving pulley 61 being arranged on crankshaft 21 and is arranged in speed reducing gear input 64a
On driven pulley 63 on, the power of internal combustion engine 20 is transmitted to driven pulley 63 by band 62 as a result,.The rotation of driven pulley 63
The speed reducing gear input 64a of deceleration mechanism 64 is transmitted to by centrifugal clutch 68, by the deceleration of deceleration mechanism 64 come
It executes and is transmitted to the power of rear-wheel 28.
External feed stream fan 61F is formed in the left pulley half portion of driving pulley 61.
In vehicle foreside 1F, the vertically oriented part of head tube 2 and down tube 3 by front cover 1a and leg protective cover 1b from front side and after
Side covering.At bottom parts 1C, the front and back alignment portion of down tube 3 is covered by base plate cover 1c.In body tail 1R, supervisor 4
It is covered in left and right sides and rear side by body cover 1d.
Referring to Fig. 2 and Fig. 3, internal combustion engine 20 has following configuration at the front of power unit P, wherein air inlet pipe 31 from
The upper surface of cylinder cap 24 upwardly extends, and cylinder cap 24 is stacked on from crankcase 22 forward cylinder body 23 outstanding and further along
It is prominent, also, exhaust pipe 51 is extended downwardly from the lower surface of cylinder cap 24.
In addition, as shown in figure 3, cylinder cap 24 right lateral surface, spark plug 26 is assembled near center cylinder cap covering 25
Part, oxygen concentration sensor 27 is assembled to the part that exhaust pipe 51 is extended to.
It is connected to the air inlet 30 of cylinder cap 24 and is bended backward from the air inlet pipe 31 that the upper surface of cylinder cap 24 extends, with connection
Fuel injection valve 32 is provided with to throttle valve body 33, and in the middle section of air inlet pipe 31.
Throttle valve body 33 is connected to the connecting tube 34 extended from the air purifier unit 40 being arranged on crankcase 22, and
And construction extends through connecting tube 34 from air purifier unit 40 and passes through throttle valve body 33 and air inlet pipe 31 and air inlet 30
The gas handling system of connection.
On the other hand, it as shown in Fig. 1,3 and 4, is connected to the exhaust outlet 50 of cylinder cap 24 and downward from the lower surface of cylinder cap 24
The exhaust pipe 51 of extension to the right and retreats and is tiltedly bent, and is further rearwardly and downwardly obliquely bent, under crankcase 22
It extends back on the right side of portion, and is connected to the silencer 52 that the right side of rear-wheel 28 is set.
Referring to Figure 2 to Figure 4, the periphery of cylinder body 23 and cylinder cap 24 is surrounded by shield 70, the substantially rectangular tubulose of shield 70, and
Shield 70 is connected to the fan cover 57 on right side.
Shield 70 has following structure, wherein is divided into upper shield 71 and the lower shield 72 of the upper half and lower half with from upper
The mode of side and downside covering cylinder body 23 and cylinder cap 24 is combined together, and to surround cylinder body 23 and cylinder cap 24, and cylinder cap covers
Part 25 is from the front side of upper shield 71 and lower shield 72, substantially open opening is protruded.
Air inlet pipe 31 is passed through and is upwardly extended from the upper side wall 71U of upper shield 71, and exhaust pipe 51 is from lower shield 72
The exhaust outlet 72h of lower wall 72D is passed through and is extended downwardly (see Fig. 3 and Fig. 4).
As shown in figure 3, spark plug 26 is before the matching surface of upper shield 71 and the right side wall 71R and 72R of lower shield 72
The opening of side portion is prominent, and oxygen concentration sensor 27 is prominent from the opening in the right side wall 72R of lower shield 72.
As shown in fig. 6, the right side wall 71R and 72R of upper shield 71 and lower shield 72 heave, while from front side (cylinder cap 24 1
Side) it is bending to the right towards rear side (23 side of cylinder body), and it is connected to fan cover 57.
In the inside for heaving side wall 71R and 72R simultaneously bending to the right simultaneously, air guides partition wall 73 to be roughly parallel to
The curved state of right side wall 71R and 72R is formed.
Referring to Fig. 6, air guides partition wall 73 to have in the rear end of 56 front of Centrifugal Cooling Fan, the rear end along with
The rotation axis of crankshaft 21 substantially orthogonal to plane formed.Air guides partition wall 73 to have positioned at cylinder body 23 and cylinder cap 24
Front end or proximal end near matching surface.
Air guide partition wall 73 separate right side wall 71R and 72R inner space, be consequently formed cylinder cap side conduit 74H and
Cylinder body side conduit 74C.
Due to the provision of fan cover 57, shield is admitted to by the cooling air stream that the rotation of Centrifugal Cooling Fan 56 generates
The inner space of 70 right side wall 71R and 72R, and separated by air guidance partition wall 73.The cooling air stream of side is by cylinder
Lid side conduit 74H is guided to cylinder cap 24, mainly to cool down cylinder cap 24；And the cooling air stream of the other side is by cylinder body side conduit 74C
Guidance is to cylinder body 23, mainly to cool down cylinder body 23.
Cylinder body 23 and cylinder cap 24 are in from the posture outstanding forward of crankcase 22, and have and have in up, down, left and right side
There is the rectangular outer perimeter surface of side wall, also, the peripheral surface is formed with multiple cooling fins 81 and 85.
The exhaust side cylinder cap side surface 24D (exhaust pipe 51 extends here) of cylinder cap 24 is lower cylinder cap side surface.
Lower cylinder body side surface with the continuous cylinder body 23 of exhaust side cylinder cap side surface 24D of cylinder cap 24 is exhaust side cylinder body side
Surface 23D.
Referring to Fig. 8, it is the perspective view seen in the inclined underside as the cylinder body 23 of single component, is provided with vapour
Cylinder holes 23b and cam chain room 23c, piston move back and forth in casing bore 23b, and cam chain room 23c is located at the left side of casing bore 23b
And cam chain 59 rotates wherein.Casing bore 23b and cam chain room 23c are formed as penetrating cylinder body in a vehicle longitudinal direction
23.Cylinder body 23 has side surface in upper and lower, left and right side.
The downside surface of cylinder body 23 is exhaust side cylinder body side surface 23D.
The right cylinder side surface of cylinder body 23 is the fan side cylinder body side surface 23R positioned at right side, the right side and crankshaft 21
The right side that Centrifugal Cooling Fan 56 is fixed to is same right side.
Referring to Fig. 6,8 and 9, the exhaust side cylinder body side surface 23D of cylinder body 23 is formed with the air guidance of multiple parallel arrangements
Cooling fins 82 form air guiding groove 83 between adjacent air guidance cooling fins 82.
It is all had by multiple air guiding grooves 83 that air guidance cooling fins 82 are formed with flowering structure, wherein entrance 83i
It is opened wide generally toward the fan side side edge 23Dr of exhaust side cylinder body side surface 23D.Fan side side edge 23Dr is and fan
The continuous corner side cylinder body side surface 23R connects edge.On the other hand, outlet 83e is in the exhaust side cylinder cap side towards cylinder cap 24
The side of surface 24D is open upwards, and exhaust pipe 51 extends from exhaust side cylinder cap side surface 24D.Each air guiding groove 83 is from entering
Mouth 83i is communicated to outlet 83e.
Air guides cooling fins 82 to be bent camber, and therefore, air guiding groove 83 is bent camber and is connected to from entrance 83i
To outlet 83e.
It is the bottom view of cylinder body 23 referring to Fig. 9, the outermost air guidance in multiple air guidance cooling fins 82
Cooling fins 82E (its upstream end sections 82i is farthest from cylinder cap 24) has the crankcase positioned at exhaust side cylinder body side surface 23D
Upstream end thereof part 82Ei at the end edge of 22 sides, and there is the cylinder cap 24 positioned at exhaust side cylinder body side surface 23D
Downstream end part 82Ee at the end edge of side.
Referring to Fig. 9, the air guidance cooling fins 82 other than outermost air guides cooling fins 82E have upper
End sections 82i is swum, is spaced apart scheduled distance with the fan side side edge 23Rd of exhaust side cylinder body side surface 23D respectively.
Therefore, exhaust side cylinder body side surface 23D forms to have in the side of fan side side edge 23Dr is not present cooling wing
The exhaust side space S d of piece, also, therefore exhaust side space S d is surrounded by outermost air guidance cooling fins 82E.
In addition, (it is centrifugal cold with being fixed with for crankshaft 21 to the fan side cylinder body side surface 23R of cylinder body 23 referring to Fig. 8
But the side of fan 56 is in ipsilateral side surface) any cooling fins 81 are not formed, the portion in addition to being located at 24 side of cylinder cap
Point.
Therefore, on the fan side cylinder body side surface 23R of cylinder body 23, cooling fins 81 exist only in 24 side of cylinder cap,
In the case where not having cooling fins 81, fan side space S r is formed in the crankcase side opposite with cylinder cap 24.
The periphery of shield 70 encirclement cylinder body 23 and cylinder cap 24.Referring to Fig. 5, lower wall 72D (its of the lower shield 72 of shield 70
Cover the downside of cylinder body 23 and cylinder cap 24) on the inner surface of its exhaust side cylinder body side surface 23D towards cylinder body 23, it is formed empty
Gas guiding rib 75 is bent and prolongs along the air guiding groove 83 for the arc-shaped bend being formed in exhaust side cylinder body side surface 23D
It stretches.Air guiding rib 75 is formed in a projecting manner.
Note that air guiding rib 75 is formed and the lower wall 72D of lower shield 72 is bent waviness, such as Figure 10 institute
Show.
Referring to Fig.1 0, for 70 cross-sectional view of cylinder body 23 and shield intercepted along the arrow X-X of Fig. 5, the exhaust side of cylinder body 23
Air guide fins 82 on the 23D of cylinder body side surface and the cloth interlaced with each other of the air guiding rib on the lower wall 72D of shield 70 75
It sets.
Therefore, the air guiding rib 75 of shield 70 is located at the air between the air guidance cooling fins 82 of cylinder body 23
The opposite of guiding groove 83.
When the Centrifugal Cooling Fan 56 on the right axle end that crankshaft 21 is arranged in rotates together with crankshaft 21, outside air
It is inhaled by the grid 57g of fan cover 57.The air of sucking disperses on centrifugal direction while rotating, and such as Fig. 7
It is shown, by the spiral shape peripheral wall 57s of fan cover 57 inner peripheral surface (its be covered on rotated clockwise in right side view it is centrifugal
The periphery of cooling fan 56) guidance, it is vortexed shown in the blank arrowhead in Fig. 7 with becoming.Then, air is from the upper of fan cover 57
The space of the side diameter of peripheral wall 57s (herein, maximum) is sent to front openings, and the right side for entering shield 70 heave part (see
Blank arrowhead in Fig. 6 and Fig. 7).
As shown in fig. 6, the cooling air stream that part is heaved on the right side for being sent into shield 70 is separated by air guidance partition wall 73.
Cooling air stream into the cylinder cap side conduit 74H of side is directed to cylinder cap 24, and enters the cylinder body side conduit 74C of the other side
Cooling air stream be directed to cylinder body 23 (see the blank arrowhead in Fig. 6).
As shown in fig. 7, being divided into the uper side surface stream towards cylinder body 23 by the cooling air stream that cylinder body side conduit 74C is guided
Dynamic cooling air stream and the cooling air stream flowed towards fan side cylinder body side surface 23R, fan side cylinder body side surface 23R are
The right lateral surface of cylinder body 23 (see the blank arrowhead in Fig. 7).
The cooling air stream for flowing to the upside side surface of cylinder body 23 is further guided by shield 70, to circulate to cylinder body 23
Left-hand face, to cool down the uper side surface and left-hand face of cylinder body 23.
Referring to Fig. 7, on the fan side cylinder body side surface 23R of cylinder body 23, cooling fins 81 are partly present in cylinder cap 24
In the region of side, and other than the region, the fan side space S r that cooling fins 81 are not present is formed.Therefore, direction
The cooling air stream that fan side cylinder body side surface 23R advances efficiently enters fan side space S r (see the blank arrowhead in Fig. 7).
Then, it is guided into the cooling air stream of the fan side space S r of fan side cylinder body side surface 23R by shield 70, with
Exhaust side cylinder body side surface (downside side surface) 23D is flow to around fan side side edge 23Rd.
Referring to Fig. 8 and 9, the cooling empty of the fan side side edge 23Rd to exhaust side cylinder body side surface 23D of cylinder body 23 is flowed through
Air-flow (see the blank arrowhead in Fig. 8 and Fig. 9) enters in exhaust side space S d, and exhaust side space S d is by exhaust side cylinder body side surface
The outermost air guidance cooling fins 82E of the side fan side side edge 23Rd of 23D is surrounded and is formed.
Cooling air stream into exhaust side space S d is introduced into the multiple air formed by air guidance cooling fins 82
The entrance 83i of guiding groove 83 (referring to the arrow → in Fig. 6,8 and 9).
The cooling air stream for introducing each entrance 83i changes stream and the air guiding groove 83 for being bent to arc guides
Dynamic direction, so that outlet 83e is conducted through towards 24 side of cylinder cap, specifically in cylinder cap 24 (exhaust pipe 51 extends from it)
(see the arrow → in Fig. 6 and Fig. 9) on the direction of exhaust side cylinder cap side surface 24D.
Therefore, cooling air stream blows to the extension from the exhaust side cylinder cap side surface 24D exhaust pipe extended, as a result,
Very efficiently cool down the extension of the very big exhaust pipe 51 of calorific value.
The embodiment of air-cooled internal combustion engine according to the present invention as described above generates following effect.
The air guidance of multiple parallel arrangements is formed with referring to Fig. 7 and Fig. 8, the exhaust side cylinder body side surface 23D of cylinder body 23
Cooling fins 82, and the air guiding groove 83 being formed between adjacent air guidance cooling fins 82 respectively has following knot
Structure, wherein the fan side side edge 23Dr of entrance 83i towards exhaust side cylinder body side surface 23D are opened wide, and outlet 83e is arranged in direction
The side of gas side cylinder cap side surface 24D is open upwards, and each air guiding groove 83 is communicated to outlet 83e from entrance 83i.
Therefore, when the cooling air stream that the rotation of Centrifugal Cooling Fan 56 generates is sent to the fan side cylinder body of cylinder body 23
Side surface 23R is simultaneously further sent to and the side surface of the continuous cylinder cap 24 of fan side cylinder body side surface 23R (fan side cylinder cap side table
Face 24R) when, as shown in fig. 6, the cooling air stream into fan side space S r for being sent to fan side cylinder body side surface 23R is protected
70 guidance of cover, to flow to exhaust side cylinder body side surface (downside surface) 23D around fan side side edge 23Rd and enter exhaust
Thus side space S d is introduced into the entrance 83i of multiple air guiding grooves 83 and is guided by air guiding groove 83, to pass through outlet
83e flows out to exhaust side cylinder cap side surface 24D.Therefore, cooling air stream blows to the row extended from exhaust side cylinder cap side surface 24D
The extension of tracheae very efficiently cools down the extension of the very big exhaust pipe 51 of calorific value as a result,.
Referring to Fig. 8, fan side cylinder body side is sent in the cooling air stream generated by the rotation of Centrifugal Cooling Fan 56
A part of the cooling air stream of the fan side cylinder cap side surface 24R of surface 23R and cylinder cap 24 flow to the air inlet pipe of cylinder body 23
The uper side surface of 31 sides, and further guided by shield 70, with the left side cylinder side surface for arriving cylinder body 23 that circulates, thus cooling
The uper side surface and left-hand face of cylinder body 23.As a result, this part of cooling air stream and being directed to fan side cylinder body side surface 23R
Cooling air stream thoroughly cooling cylinder body 23 together.
Note that as shown in fig. 6, the right side for being sent into shield 70, which is heaved in the cooling air stream of part, guides separation by air
The separated cooling air stream of wall 73 will enter cylinder cap side conduit 74H in side and be directed into cylinder cap 24, be promoted by shield 70
Make to be flowed along the cooling fins 85 of the periphery of cylinder cap 24, thus thoroughly cooling cylinder cap 24.
Cooling air stream is by the exhaust outlet 72h discharge of the lower wall 72D of lower shield 72, and exhaust pipe 51 is from the lower shield 72
It is prominent.
As shown in figure 9, the air guiding groove 83 being formed in exhaust side cylinder body side surface 23D is from entrance 83i to outlet 83e
It is bent camber, therefore, the limited resistance to the cooling air stream for introducing entrance 83i, and cooling air stream can be by changing
Become flow direction and flow out glibly and by outlet 83e, so as to the extension of cooled exhaust pipe 51 with higher efficiency.
As shown in figure 8, outermost air guidance cooling fins 82E is (thereon in multiple air guidance cooling fins 82
Trip end sections are farthest from cylinder cap 24) upstream end thereof part 82Ei be located at the exhaust side cylinder body side surface of 22 side of crankcase
In the end edge of 23D, and end sections 82Ee is located at the end of the exhaust side cylinder body side surface 23D of 24 side of cylinder cap downstream
On portion edge.Therefore, circulating the cooling air stream to exhaust side cylinder body side surface 23D from fan side cylinder body side surface 23R can be with
It is efficiently introduced by outermost air guidance cooling fins 82E, while reducing leakage, and cooling air stream can be made to pass through
Exhaust side cylinder cap side surface 24D is flowed out to by the air guiding groove 83 that multiple air guidance cooling fins 82 limit.It therefore, can be with
It more efficiently cools down from the part of the exhaust side cylinder cap side surface 24D exhaust pipe 51 extended.
As shown in figure 9, the air guidance cooling fins 82 in addition to outermost air guides cooling fins 82E are with upper
End sections 82i is swum, is spaced apart scheduled distance with the fan side side edge 23Rd of exhaust side cylinder body side surface 23D respectively.
Therefore, on exhaust side cylinder body side surface 23D, the exhaust side space S d of no cooling fins 81 and 82 by outermost air to be drawn
The state for leading cooling fins 82E encirclement is formed in the side fan side side edge 23Dr.Therefore, by fan side side edge 23Dr from
The cooling air stream that fan side cylinder body side surface 23R to exhaust side cylinder body side surface 23D flows can efficiently enter exhaust side
Space S d, and curved air guiding groove 83 can be flowed into.Therefore, can efficiently cooled exhaust pipe 51 extension.
As shown in FIG. 7 and 8, other than the part of 24 side of cylinder cap, the fan side cylinder body side surface 23R of cylinder body 23 not shape
At there is cooling fins 81.Therefore, the cooling empty of fan side cylinder body side surface 23R is sent to by the rotation of Centrifugal Cooling Fan 56
Air-flow can be efficiently into the fan side space S r on the fan side cylinder body side surface 23R for not forming cooling fins 81.
Cooling air stream can be made to flow along the part for not forming cooling fins 81 of fan side cylinder body side surface 23R, and bypassed
Fan side side edge 23Rd flow to exhaust side cylinder body side surface 23D, and enough cooling air streams is allowed to be introduced into air
In guiding groove 83 and the extension of exhaust pipe 51 can be blown to, so as to prolonging for cooled exhaust pipe 51 with higher efficiency
Extending portion point.
As shown in figure 5 and figure 10, (it is covered under cylinder body 23 and cylinder cap 24 the lower wall 72D of the lower shield 72 of shield 70
Side) on the inner surface of its exhaust side cylinder body side surface 23D towards cylinder body 23, form air guiding rib 75 outstanding, edge
Be formed in the air guiding groove 83 of arc-shaped bend in exhaust side cylinder body side surface 23D and extend and be bent.Therefore, pass through shield
70 air guiding rib 75 and the air of cylinder body 23 guide the cooperation of cooling fins 82, and exhaust side cylinder body side surface 23D is arrived in circulation
Cooling air stream can be guided by shield 70, it can be made to flow out to exhaust side cylinder cap side surface 24D, and can be towards exhaust pipe
51 extension blowout.Therefore, it is convenient to omit the air of some quantity of cylinder body 23 guides cooling fins 82, to be conducive to
The formation of cylinder body 23, and fire check when can prevent from being formed.
As shown in Figure 10, air guiding rib 75 and air guide the arrangement interlaced with each other of cooling fins 82, and air guides as a result,
Rib 75 can guide cooling fins 82 effectively to arrange relative to air.
As shown in fig. 6, guiding partition wall 73 by air by the cooling air stream of the rotation supply of Centrifugal Cooling Fan 56
It separates, and is substantially directed separately to cylinder body 23 and cylinder cap 24.Therefore, mainly it is sent to the fan side cylinder body side table of cylinder body 23
The cooling air stream of face 23R is to ensure that abundance, without flowing to 24 side of cylinder cap too much.The cooling sky of this sufficient quantity
Air-flow circulates to exhaust side cylinder body side surface 23D, and the extension of exhaust pipe 51 is blown to by air guiding groove 82, so as to
To improve cooling effect.
Although air-cooled internal combustion engine according to an embodiment of the invention is described above, mould of the invention
Formula is not limited to the above embodiments, and the various modes including executing in the range of the purport of the present invention.
For example, the vehicle for being equipped with air-cooled internal combustion engine of the invention is not limited to the pedal-type two-wheel motor in embodiment
Any one of vehicle, but can be the various saddle-type vehicles of such as three-wheel or four-wheeled vehicle, as long as having institute
The vehicle of the requirement of protection.
[reference signs list]
1 ... pedal-type two-wheel motorcycle, 2 ... head tubes, 3 ... down tubes, 4 ... supervisors, 5 ... containing boxs, 6 ... fuel tanks, 7 ... seats
Position, 8 ... handles, 9 ... front forks, 10 ... front-wheels, 11 ... Support brackets, 12 ... link components, 13 ... pivots, 19 ... posterior bumpers；
P ... power unit, 20 ... internal combustion engines, 21 ... crankshafts, 22 ... crankcases, 22L ... left crankcase part (speed change case portion
Point), 22R ... right crankcase part, 22h ... engine suspension frame；
23 ... cylinder bodies, 23D ... exhaust side cylinder body side surface, 23Dr ... fan side side edge, Sd ... exhaust side space,
23R ... fan side cylinder body side surface, Sr ... fan side space, 23Dr ... fan side side edge, 24 ... cylinder caps, 24D ... exhaust side
Cylinder cap side surface；
25 ... cylinder cap coverings, 26 ... spark plugs, 27 ... oxygen concentration sensors, 28 ... rear-wheels；
30 ... air inlets, 31 ... air inlet pipe, 32 ... fuel injection valves, 33 ... throttle valve bodys, 34 ... connecting tubes, 40 ... air
Filter；
50 ... exhaust outlets, 51 ... exhaust pipes, 52 ... silencers, 55 ... AC generators, 56 ... Centrifugal Cooling Fans, 57 ...
Fan cover, 58 ... drive sprockets, 59 ... cam chains；
60 ... Belt-type Adjustable-speed speed changers, 61 ... driving pulleys, 61F ... external feed stream fan, 62 ... bands, 63 ... is driven
Wheel, 64 ... deceleration mechanisms, 64a ... speed reducing gear input, 65 ... gear shift covers；
70 ... shields, 71 ... upper shields, 71U ... upper side wall, 71R ... right side wall, 72 ... lower shields, 72D ... lower wall,
72h ... exhaust outlet, 72R ... right side wall, 73 ... air guidance partition wall, 74H ... cylinder cap side conduit, 74C ... cylinder body side conduit,
75 ... air guiding ribs；
81 ... cooling fins, 82 ... air guide cooling fins, 82i ... upstream end thereof part, 82e ... upstream end thereof portion
Point, the outermost air of 82E ... guides cooling fins, and 82Ei ... upstream end thereof part, 82Ee ... downstream end part, 83 ... is empty
Gas guiding groove, 83i ... entrance, the outlet 83e ..., 85 ... cooling fins.
Claims (according to the 19th article of modification of treaty)
1. a kind of air-cooled internal combustion engine, in which:
Be provided with cooling fins (81) cylinder body (23) and cylinder cap (24) in a manner of successively stacking from being pivotably supported crankshaft
(21) crankcase (22) is upwardly extended in the side of the axis perpendicular to the crankshaft (21)；
Centrifugal Cooling Fan (56) is fixed to the one end of the crankshaft (21)；
Air inlet pipe (31) and exhaust pipe (51) extend in opposite the upper side and lower side from the side surface of the cylinder cap (24)；
The cylinder body (23) and the cylinder cap (24) are surrounded by shield (70)；And
The fan cover (57) for covering the Centrifugal Cooling Fan (56) from cross side is connected to the shield (70), so that cooling
Air stream is sent into the shield (70) by the Centrifugal Cooling Fan (56), with the cooling cylinder body (23) and the cylinder cap
(24)；
It is characterized by:
The exhaust side cylinder body side surface (23D) of the cylinder body (23) and exhaust side cylinder cap side surface (24D) continuously, the exhaust side cylinder
Lid side surface is the downside surface of the cylinder cap (24), and the exhaust pipe (51) extends from the downside surface, the exhaust side
Cylinder body side surface (23D) is provided with multiple air guidance cooling fins (82) of parallel arrangement, and air guiding groove (83) is formed in
Between adjacent air guidance cooling fins (82)；
Respectively there is a structure by the multiple air guiding groove (83) that air guidance cooling fins (82) is formed,
In, entrance (83i) is open upwards in the side of the fan side side edge (23Dr) towards exhaust side cylinder body side surface (23D),
The end of the fixation Centrifugal Cooling Fan (56) of the fan side side edge and the crankshaft (21) is located at same side, and
And the air guiding groove (83) respectively has outlet (83e), the outlet is towards exhaust side cylinder cap side surface
The side of (24D) is open upwards, and each of described air guiding groove (83) is communicated to the outlet from the entrance (83i)
(83e)；And
Air guidance cooling fins (82) is bent camber, and the air guiding groove (83) from the entrance (83i) to
The outlet (83e) is bent camber.
2. air-cooled internal combustion engine as described in claim 1, wherein the air with upstream end thereof part (82i) guides cooling
Fin (82) includes outermost air guidance cooling fins (82E) with upstream end thereof part (82Ei), the outermost
Air guidance cooling fins upstream end thereof part farthest from the cylinder cap (24), and be located at exhaust side cylinder body side surface
(23D) at the end edge of the crankcase (22) side, and outermost air guidance cooling fins (82E) tool
Have downstream end part (82Ee), the downstream end part be located at exhaust side cylinder body side surface (23D) in the cylinder cap
(24) at the end edge of side.
3. air-cooled internal combustion engine as claimed in claim 2, wherein outermost air guidance cooling fins (82E) it
Outer air guidance cooling fins (82) has upstream end thereof part (82i), the upstream end thereof part respectively with the exhaust side
The fan side side edge (23Dr) of cylinder body side surface (23D) is spaced apart scheduled distance.
4. air-cooled internal combustion engine as claimed any one in claims 1 to 3, wherein fan side cylinder body side surface (23R)
It is located at same side for the cylinder body (23) and the end of the fixation Centrifugal Cooling Fan (56) of the crankshaft (21)
Side surface, fan side cylinder body side surface are formed without the cooling fins except the region of the cylinder cap (24) side
(81)。
5. air-cooled internal combustion engine according to any one of claims 1 to 4, wherein the shield (70) towards the cylinder
The exhaust side inner surface of the exhaust side cylinder body side surface (23D) of body (23) is formed with air guiding rib (75), the air guiding rib
Extend along the air guiding groove (83) formed by air guidance cooling fins (82).
6. air-cooled internal combustion engine as claimed in claim 5, wherein the air guiding rib (75) and air guidance cooling
Fin (82) interlaced arrangement.
7. such as air-cooled internal combustion engine described in any one of claims 1 to 6, wherein for distinguishing the cooling air stream
It guides to the air of the cylinder cap (24) and the cylinder body (23) guidance partition wall (73) and is formed in the connection of the shield (70)
To the inside of the lateral parts of the fan cover (57).
Illustrate or states (according to the 19th article of modification of treaty)
Content appended below is the content modified according to the 19th article of PCT Article, wherein with a new claims the
1-7 are replaced original claims 1-8.
Claims of this modification are accepted on December 20th, 2017 by international office.
Statement based on the 19th article of treaty (1)
1. modifying content
(1) claim 1 is added in the content of claim 2, and deletes claim 2.
(2) with the deletion of claim 2, modification right requires 3,5,6,8 subordinate relation.
2. explanation
It is pointed out in the written comment of international search report, the invention of claim 2-4 and the invention of claim 5-7
" having novelty and creativeness relative to any document 1-9 quoted in international search report ", so will be for this field skill
Claim 1 is added in the content of the non-obvious claim 2 of art personnel.
In addition, being deleted the claim 2 in claim 1 is added into.
Claims (8)
1. a kind of air-cooled internal combustion engine, in which:
Be provided with cooling fins (81) cylinder body (23) and cylinder cap (24) in a manner of successively stacking from being pivotably supported crankshaft
(21) crankcase (22) is upwardly extended in the side of the axis perpendicular to the crankshaft (21)；
Centrifugal Cooling Fan (56) is fixed to the one end of the crankshaft (21)；
Air inlet pipe (31) and exhaust pipe (51) extend in opposite the upper side and lower side from the side surface of the cylinder cap (24)；
The cylinder body (23) and the cylinder cap (24) are surrounded by shield (70)；And
The fan cover (57) for covering the Centrifugal Cooling Fan (56) from cross side is connected to the shield (70), so that cooling
Air stream is sent into the shield (70) by the Centrifugal Cooling Fan (56), with the cooling cylinder body (23) and the cylinder cap
(24)；
It is characterized by:
The exhaust side cylinder body side surface (23D) of the cylinder body (23) and exhaust side cylinder cap side surface (24D) continuously, the exhaust side cylinder
Lid side surface is the downside surface of the cylinder cap (24), and the exhaust pipe (51) extends from the downside surface, the exhaust side
Cylinder body side surface (23D) is provided with multiple air guidance cooling fins (82) of parallel arrangement, and air guiding groove (83) is formed in
Between adjacent air guidance cooling fins (82)；And
Respectively there is a structure by the multiple air guiding groove (83) that air guidance cooling fins (82) is formed,
In, entrance (83i) is open upwards in the side of the fan side side edge (23Dr) towards exhaust side cylinder body side surface (23D),
The end of the fixation Centrifugal Cooling Fan (56) of the fan side side edge and the crankshaft (21) is located at same side, and
And the air guiding groove (83) respectively has outlet (83e), the outlet is towards exhaust side cylinder cap side surface
The side of (24D) is open upwards, and each of described air guiding groove (83) is communicated to the outlet from the entrance (83i)
(83e)。
2. air-cooled internal combustion engine as described in claim 1, wherein air guidance cooling fins (82) is bent camber,
And the air guiding groove (83) is bent camber from the entrance (83i) to the outlet (83e).
3. air-cooled internal combustion engine as claimed in claim 1 or 2, wherein the air guidance with upstream end thereof part (82i) is cold
But fin (82) includes outermost air guidance cooling fins (82E) with upstream end thereof part (82Ei), described outermost
The upstream end thereof part of the air guidance cooling fins of side farthest from the cylinder cap (24), and is located at exhaust side cylinder body side table
Face (23D) at the end edge of the crankcase (22) side, and outermost air guidance cooling fins (82E)
With downstream end part (82Ee), the downstream end part be located at exhaust side cylinder body side surface (23D) in the cylinder
It covers at the end edge of (24) side.
4. air-cooled internal combustion engine as claimed in claim 3, wherein outermost air guidance cooling fins (82E) it
Outer air guidance cooling fins (82) has upstream end thereof part (82i), the upstream end thereof part respectively with the exhaust side
The fan side side edge (23Dr) of cylinder body side surface (23D) is spaced apart scheduled distance.
5. air-cooled internal combustion engine according to any one of claims 1 to 4, wherein fan side cylinder body side surface (23R)
It is located at same side for the cylinder body (23) and the end of the fixation Centrifugal Cooling Fan (56) of the crankshaft (21)
Side surface, fan side cylinder body side surface are formed without the cooling fins except the region of the cylinder cap (24) side
(81)。
6. the air-cooled internal combustion engine as described in any one of claims 1 to 5, wherein the shield (70) towards the cylinder
The exhaust side inner surface of the exhaust side cylinder body side surface (23D) of body (23) is formed with air guiding rib (75), the air guiding rib
Extend along the air guiding groove (83) formed by air guidance cooling fins (82).
7. air-cooled internal combustion engine as claimed in claim 6, wherein the air guiding rib (75) and air guidance cooling
Fin (82) interlaced arrangement.
8. the air-cooled internal combustion engine as described in any one of claims 1 to 7, wherein for distinguishing the cooling air stream
It guides to the air of the cylinder cap (24) and the cylinder body (23) guidance partition wall (73) and is formed in the connection of the shield (70)
To the inside of the lateral parts of the fan cover (57).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016157187 | 2016-08-10 | ||
| JP2016-157187 | 2016-08-10 | ||
| PCT/JP2017/028438 WO2018030302A1 (en) | 2016-08-10 | 2017-08-04 | Air-cooled internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109563764A true CN109563764A (en) | 2019-04-02 |
| CN109563764B CN109563764B (en) | 2021-06-01 |
Family
ID=61162251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780047836.9A Active CN109563764B (en) | 2016-08-10 | 2017-08-04 | Air-cooled internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3499000A4 (en) |
| JP (1) | JP6639679B2 (en) |
| CN (1) | CN109563764B (en) |
| WO (1) | WO2018030302A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6795644B2 (en) * | 2018-03-23 | 2020-12-02 | 本田技研工業株式会社 | Swing unit type power unit |
| JP6892475B2 (en) * | 2019-03-29 | 2021-06-23 | 本田技研工業株式会社 | Internal combustion engine |
| JP7191871B2 (en) * | 2020-01-07 | 2022-12-19 | 本田技研工業株式会社 | blower |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49136928U (en) * | 1973-03-27 | 1974-11-26 | ||
| JPS5699034U (en) * | 1979-12-27 | 1981-08-05 | ||
| CN1112646A (en) * | 1994-03-15 | 1995-11-29 | 本田技研工业株式会社 | Air cooled internal combustion engine |
| CN102889125A (en) * | 2011-07-20 | 2013-01-23 | 雅马哈发动机株式会社 | Internal combustion engine and straddle-type vehicle equipped with the engine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5648917Y2 (en) * | 1976-09-10 | 1981-11-14 | ||
| JPH07293238A (en) * | 1994-04-26 | 1995-11-07 | Tokyo R & D:Kk | Cooling device for engine |
| JP4208341B2 (en) * | 1999-04-28 | 2009-01-14 | 本田技研工業株式会社 | A shroud of a forced air-cooled internal combustion engine mounted on a vehicle |
| JP2001241325A (en) * | 2000-02-29 | 2001-09-07 | Yamaha Motor Co Ltd | Cooling structure of forced-air-cooled four cycle engine |
| JP5801140B2 (en) * | 2011-08-22 | 2015-10-28 | 本田技研工業株式会社 | Forced air-cooled internal combustion engine |
| JP5924769B2 (en) * | 2012-06-22 | 2016-05-25 | 本田技研工業株式会社 | Cooling structure in forced air-cooled engine |
| JP6003710B2 (en) * | 2013-02-19 | 2016-10-05 | スズキ株式会社 | Cooling structure of forced air cooling engine |
-
2017
- 2017-08-04 EP EP17839373.2A patent/EP3499000A4/en not_active Withdrawn
- 2017-08-04 JP JP2018533007A patent/JP6639679B2/en active Active
- 2017-08-04 CN CN201780047836.9A patent/CN109563764B/en active Active
- 2017-08-04 WO PCT/JP2017/028438 patent/WO2018030302A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49136928U (en) * | 1973-03-27 | 1974-11-26 | ||
| JPS5699034U (en) * | 1979-12-27 | 1981-08-05 | ||
| CN1112646A (en) * | 1994-03-15 | 1995-11-29 | 本田技研工业株式会社 | Air cooled internal combustion engine |
| CN102889125A (en) * | 2011-07-20 | 2013-01-23 | 雅马哈发动机株式会社 | Internal combustion engine and straddle-type vehicle equipped with the engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6639679B2 (en) | 2020-02-05 |
| WO2018030302A1 (en) | 2018-02-15 |
| EP3499000A1 (en) | 2019-06-19 |
| CN109563764B (en) | 2021-06-01 |
| JPWO2018030302A1 (en) | 2019-06-13 |
| EP3499000A4 (en) | 2019-07-24 |
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