CN101713332A

CN101713332A - An internal combustion engine

Info

Publication number: CN101713332A
Application number: CN200910221460A
Authority: CN
Inventors: 泷口亲司; 阿部克哉; 渡边觉
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2008-09-30
Filing date: 2009-09-25
Publication date: 2010-05-26
Anticipated expiration: 2029-09-25
Also published as: CN101713332B; JP5162400B2; JP2010084652A

Abstract

The invention provides an internal combustion engine that can be assembled temporarily without increasing amounts of chucking appliances or components. A box body (91) covers a power transmission component comprises a crankshaft case (24B) on a lateral side and a part (transmission case (61A) on internal side) amount the power transmission components; one end of the shaft component (155) that set parappel to the crank (51) communicates with an opening (24B1) on at least one side of the crankshaft case (24B), is supported by the box body that covers the power transmission component. The other end of the shaft component (155) is supported by a crankshaft case (24A) on the other side; the shaft component (155) is provided with an expansion part (160) that set on opening (24B1) of the crankshaft case (24B).

Description

Internal-combustion engine

Technical field

The present invention relates to a kind of internal-combustion engine.

Background technique

Have at the motor (internal-combustion engine) that is equipped on automatic two-wheeled cycle etc. the support shaft supports that will be arranged on the supporting axle of in-engine power-transmission system and starting system in about technology on the crankcase cut apart.In assembling during this motor, a side of the crankcase of cutting apart about described each supporting axle is assembled in positions, and afterwards, assembles the crankcase (for example, with reference to patent documentation 1) of opposite side again.

Patent documentation 1: Japanese kokai publication sho 59-058123 communique.

Yet, in the outside that other casing (for example speed changer case) is connected in crankcase, support with this casing and another crankcase under the situation of engine structure of supporting axle, owing to could assemble other casing behind the crankcase of the assembling left and right sides, so, preferably before the other casing of assembling, on the crankcase about described supporting axle is assembled in temporarily and position.

Yet, in the method for the anchor clamps that use interim assembling usefulness, might increase anchor clamps or parts number of packages, interim assembling operation becomes necessary part, makes operation complicated more.

Summary of the invention

The present invention In view of the foregoing proposes, and its objective is, provides a kind of anchor clamps or parts number of packages of neither increasing, again the internal-combustion engine that can temporarily assemble.

In order to address the above problem, the invention provides a kind of internal-combustion engine, it has bent axle that is supported on the pairing left and right crankcase and the spindle unit that be arranged in parallel with this bent axle, end at this bent axle is provided with power transmission member, and be provided with the casing that covers this power transmission member, described internal-combustion engine is characterised in that, the casing that covers described power transmission member comprises at described crankcase of the side and the position between the described power transmission member, one end of the described spindle unit that be arranged in parallel with described bent axle passes the opening on the described crankcase that is arranged at least one side, and be supported on the casing that covers described power transmission member, the other end of described spindle unit is supported on the opposing party's the described crankcase, be provided with wide diameter portion on described spindle unit, described wide diameter portion is in the face of the opening on the described crankcase that is arranged on a side.

According to the present invention, the casing that covers power transmission member comprises at a side crankcase and the position between the power transmission member, one end of the spindle unit that be arranged in parallel with bent axle passes in the opening of the crankcase that is arranged at least one side, be supported on the casing that covers power transmission member, the other end of described spindle unit is supported on the opposing party's the described crankcase, on described spindle unit, be provided with wide diameter portion, described wide diameter portion is in the face of the opening on the crankcase that is arranged on a side, therefore, need not increase anchor clamps or parts number of packages, just can realize the interim assembling of the spindle unit (supporting axle of power-transmission system or starting system) that be arranged in parallel with bent axle.

In addition, internal-combustion engine of the present invention comprises: a pair of crankcase of supporting crankshaft; Be arranged at the speed changer case of covering speed changer of a side of this crankcase; Be supported on the axle that steps of this crankcase; Be supported on the jack shaft that steps of the opposite side of crankcase and speed changer case, via step jack shaft will step the axle rotation pass to bent axle, described internal-combustion engine is characterised in that, be provided with in a side of described crankcase and make the described opening that jack shaft connects that steps, the described jack shaft that steps supports by the opposite side of described crankcase and in a side of described crankcase and the described speed changer case between the described speed changer by described opening, is provided with the wide diameter portion of facing described opening at the described jack shaft that steps.

According to the present invention, be provided with to make in a side of crankcase and step the opening that jack shaft connects, described step jack shaft by described opening by the opposite side of crankcase and in a side and the supporting of the speed changer case between the speed changer of crankcase, be provided with the wide diameter portion right at the described jack shaft that steps with described opening surface, therefore, need not increase anchor clamps or parts number of packages, just can step the interim assembling of jack shaft.

In said structure, describedly step the below that jack shaft can be positioned at described bent axle, the described opening portion of described crankcase disposes with the part of described bent axle is approaching under side-looking, and described wide diameter portion is to have downcut a part of flange shape, can avoid the part of described bent axle.According to this structure, can avoid and the contacting of bent axle, can step the interim assembling of jack shaft again.

In addition, in said structure, the described jack shaft that steps is being supported under the opposite side and the state on the described speed changer case of described crankcase, described wide diameter portion also can between the counterweight of described bent axle and described crankcase.According to this structure, can effectively utilize space idle between the counterweight of bent axle and the crankcase and dispose wide diameter portion.

The invention effect

In the present invention, because covering the casing of power transmission member comprises at a side crankcase and the position between the power transmission member, one end of the spindle unit that be arranged in parallel with bent axle passes in the opening on the crankcase that is arranged at least one side, be bearing on the casing that covers power transmission member, the other end of described spindle unit is bearing on the opposing party's the crankcase, be provided with wide diameter portion at above-mentioned spindle unit, described wide diameter portion is faced the opening of the crankcase that is arranged on a side, therefore, need not increase anchor clamps or parts number of packages, just can assemble temporarily.

In addition, in the present invention, be provided with to make in a side of crankcase and step the opening that jack shaft connects, described step jack shaft by described opening by the opposite side of crankcase and in a side and the supporting of the speed changer case between the speed changer of crankcase, be provided with the wide diameter portion right at the described jack shaft that steps with described opening surface, therefore, need not increase anchor clamps or parts number of packages, just can step the interim assembling of jack shaft.

In addition, step jack shaft and can be positioned at the below of bent axle, the opening portion of crankcase disposes with the part of bent axle is approaching under side-looking, described wide diameter portion is for downcutting the flange shape of a part, can avoid the part of bent axle, therefore, can avoid and the contacting of bent axle, can step the interim assembling of jack shaft again.

In addition, be supported under the opposite side and the state on the speed changer case of crankcase will stepping jack shaft, described wide diameter portion between the counterweight of bent axle and crankcase also can, therefore, can effectively utilize that idle space disposes wide diameter portion between the counterweight of bent axle and the crankcase.

Description of drawings

Fig. 1 is the side view of the automatic two-wheeled cycle of embodiment of the present invention.

Fig. 2 is a schematic representation of seeing the engine interior structure from the car body right side.

Fig. 3 is the figure in the III-III cross section of presentation graphs 2.

Fig. 4 is the figure in IV-IV cross section in the presentation graphs 2.

Fig. 5 (A) is the sectional side view that expression second steps jack shaft, (B) is the figure from a distolateral observation.

Fig. 6 is the figure that observes right crankcase from the outside.

Fig. 7 is the figure that observes right crankcase from the inboard.

Fig. 8 is the figure that observes left crankcase from the inboard.

Symbol description

The 1-automatic two-wheeled cycle, 2-vehicle body frame, 20-motor (internal-combustion engine), 22-cylinder portion, 24-crankcase, 24A-left crankcase, 24B-right crankcase, 24B1-opening portion, the 25-hood that generates electricity, the 31-output shaft, 38-steps axle, and 39-steps arm, the 40-pedal, 41-plays motor, the 51-bent axle, 51A rotating band wheel shaft, 60-variable v-belt drive (power transmission mechanism), 61-speed changer case (power transmission mechanism casing), the inboard speed changer case of 61A-, 61B-outer variator cover 64-driven belt wheel shaft, 89-centrifugal clutch (wet-type centrifugal clutch), 81-reduction gear, 140-step and play mechanism, 150-steps jack shaft, 151-first steps jack shaft, and 155-second steps jack shaft, the 160-wide diameter portion, the 161-notch, the 170-gear mechanism of beating, L1-cylinder-bore axis, R0-crankshaft room, the R1-clutch chamber, R2-speed changer chamber.

Embodiment

Below, with reference to description of drawings an embodiment of the invention.

In addition, in the following description, front and back and above-below direction are the directions from driver's observation of car body.In addition, arrow F represents car body the place ahead among the figure, and arrow L represents the car body left, and arrow U represents the car body top.

Fig. 1 is the side view of the automatic two-wheeled cycle 1 of an embodiment of the present invention.The vehicle body frame 2 of this automatic two-wheeled cycle 1 comprises: the head pipe 3 of Vehicular body front; From the downward also main frame 4 of diagonally extending of these pipe 3 tilted rearward; Extend fixing pairing left and

right pivot cradle

5,5 downwards at the rear portion of this main frame 4; At the rear portion of main frame 4, extend upward near the tilted rearward front, fixed position of

pivot cradle

5,5, bend to the pairing left and right

seat guide rail

6,6 of rear end halfway; The pairing left and right strengthened frame of strengthening between the central part to

pivot cradle

5,5 and above-mentioned

seat guide rail

6,67,7.

Above the pairing left and right

seat guide rail

6,6 of vehicle body frame 2, be provided with by bus with vehicle seat 8, be provided with accommodation section (accommodating case) 9 in its underpart.Be supported on handlebar 10 on the head pipe 3 being provided with axle above the Vehicular body front, below handlebar 10, be provided with

front fork

11,11 with extending, be supported with front-wheel 12 at the lower end axle of front fork 11,11.On the

pivot cradle

5,5 of car body central authorities, by pivot 13 swingably axle supporting the front end of back vent 14, this back vent 14 rearward extends, and is supported with trailing wheel 15 at the rearward end axle of back vent 14.Between the rear portion of back vent 14 and seat guide rail 6, insert pairing left and right

posterior bumper

16,16.

Below main frame 4, and hanging motor (being called power unit) 20 in the place ahead of

pivot cradle

5,5 as internal-combustion engine.Hang on the supporting bracket 17,17 of the central part that is arranged on main frame 4 floppily on the top of motor 20, and the rear portion of motor 20 is fixed on two positions of pivot cradle 5.That is, motor 20 is supported with the form of the rear portion downside that is hung in main frame 4.In addition, the car body cover 18 made by the synthetic resin that is divided into each several part of vehicle body frame 2 covers.

Motor 20 is four-circulation motors of single cylinder, cylinder portion 22 from the front of crankcase 24 to roughly near horizontal state, constitute the horizontal engine that leans forward significantly.Therefore, can make the car body centre of gravityization, and, can make main frame 4 step-downs in illustrated mode, driving the M of leap portion that crosses over when riding thereby can reduce, improved the performance of getting on or off the bus.In addition, left surface front portion at crankcase 24 is equipped with (back detailed description) generating hood 25, and as shown in Figure 1, car body cover 18 is seen near the outer rim of crankcase 24 from vehicle body side, hood-shaped shape with covering body makes the side of the crankcase 24 that comprises the hood that generates electricity expose the outside.

Cylinder portion 22 upsides at this motor 20 are connected with sucking pipe 26, and this sucking pipe 26 extends upward, are connected with throttle valve body 27 and air-strainer 28 on being bearing in main frame 4.Downside in cylinder portion 22 is connected with outlet pipe 29, and this outlet pipe 29 extends the crooked and extension rearward in back towards the below, be connected with the silencing apparatus 30 that is configured in trailing wheel 15 right sides.

In addition, be supported with the output shaft 31 of motor 20, the front end of this output shaft 31 is exposed in the left surface rear axle of crankcase 24.Front end at output shaft 31 is equipped with driving sprocket wheel 32, at this driving sprocket wheel 32 be arranged on integratedly between the driven sprocket 33 on the trailing wheel 15 and be wound with power transmission chain 34, constitutes chain drive.Like this, the rotation of the output shaft 31 of this motor 20 is transmitted to trailing wheel 15 by chain drive.In addition, this chain drive is also as the secondary speed-reducing mechanism performance function of recently setting the reduction speed ratio (secondary speed-reducing ratio) between output shaft 31 and the rear-wheel spindle by the number of teeth of each sprocket wheel 32,33.In addition, among the figure, symbol 35 is the covers that cover chain drive.

In the bottom of crankcase 24 pedal-rod 36 that extends to the car body left and right directions is installed, at these pedal-rod 36 two ends the driver is installed and puts the pair of pedals 36A of pin, 36A.

In addition, on this automatic two-wheeled cycle 1, the parts (starting system parts) 37 that step that constitute the part of 20 the pedaling starting arrangement of piloting engine are provided in crankcase 24 left side sides.Promptly, this steps parts 37 has: front end from crankcase 24 expose by axle supporting be installed on step on the axle 38 step arm 39 and be installed in this front end that steps arm 39 and rotate freely treadle 40, the driver treadles 40 by pedal, make to step axle 38 rotations, can pilot engine 20.

And then, on this automatic two-wheeled cycle 1, except the pedaling starting arrangement, also be equipped with the starting motor 41 that engine start is used.This starting motor 41 is installed in the top front portion of crankcase 24, pilots engine 20 by making these starting motor 41 work.That is, on this automatic two-wheeled cycle 1, adopt any means of pedaling and starting motor formula, can constitute 20 the mechanism of piloting engine.

Fig. 2 is the in-built figure that observes motor 20 from the car body right side, shows the unify position of main running shaft of starting system of power conveying system.In addition, also show cylinder-bore axis L1.In addition, Fig. 3 is the figure in III-III cross section in the presentation graphs 2.

As shown in Figures 2 and 3, the crankcase 24 of motor 20 by left crankcase 24A and right crankcase 24B constitute about two cut apart the structure form, in the front portion of this crankcase 24, by being bearing in pairing left and right bearing (rolling bearing) 45,45 cross settings (along the vehicle-width direction) the ground axle suspension bent axle 51 on left and right sides crankcase 24A, the 24B.

On this bent axle 51, same with four-circulation motor in the past, linking by connecting rod has slides freely the not shown piston along cylinder-bore axis L1 cylinder portion 22 in, under the situation that drives motor 20, utilize moving of piston, rotates driving bent axle 51.In addition, the balancer weight that is used for spin balancing (below, be called counterweight) 52 is installed on this bent axle 51.

In addition, among the figure, symbol 55 is provided in a side of the cam chain driving sprocket wheel on the bent axle 51, utilizes this cam chain driving sprocket wheel 55 driving cam chains, by this cam chain, the rotation of bent axle 51 is passed to active valve mechanism in the front shroud that is located at cylinder portion 22.

As shown in Figure 3, left at crankcase 24, promptly on left crankcase 24A, the bolt binding is useful on the generating hood 25 of accommodating generator 180, right-hand at crankcase 24, promptly the bolt binding has speed changer case (power transmission mechanism casing) 61 on right crankcase 24B, and speed changer case 61 contains variable v-belt drive (power transmission mechanism) 60, and variable v-belt drive 60 makes the transmission of power variable ratio between bent axle 51 and the output shaft 31.In addition, crankcase 24, generating hood 25 and speed changer case 61 form by cast member.

Variable v-belt drive 60 is without the lubricated dry type power transmission mechanism of engine oil, speed changer case 61 and the crankcase 24 that is lubricated with engine oil, form another chamber, constitute the chamber of no fluid, by inboard speed changer case (the being called the belt pass box) 61A that covers vehicle-width direction inboard and cover the vehicle-width direction outside outer variator cover (being called belt transmission cover) 61B about two cut apart the structure formation.

Bent axle 51 connects right crankcase 24B and inboard speed changer case 61A, and exposes in speed changer case 61, and use as the rotating band wheel shaft 51A of variable v-belt drive 60 right part of this bent axle that exposes 51, on this rotating band wheel shaft 51A driving pulley 63 is installed.

In addition, be supported with the driven belt wheel shaft 64 of variable v-belt drive 60 in the rear axle of crankcase 24.More particularly, this driven belt wheel shaft 64 is by being bearing in the pairing left and right bearing (rolling bearing) 65,65 on right crankcase 24B and the speed changer case 61 (inboard speed changer case 61A), the parallel earth's axis is bearing in the rear of rotating band wheel shaft 51A, and driven pulley 67 is installed.And, between driving pulley 63 and driven pulley 67, be hung with V-type band 68.In addition, between speed changer case 61 and each

belt shaft

51A, 64, be inserted with the engine oil that is used for stoping in the crankcase 24 and invade sealed member 69A, the 69B of speed changer case 61, speed changer case 61 and belt Pyatyi speed changer 60 are isolated (sealing) with crankcase 24.

Driving pulley 63 has fixedly halfbody 63A and the movable halves 63B that rotates with rotating band wheel shaft 51A, and fixedly halfbody 63A is fixed on the bent axle right part, and movable halves 63B is disposed at than fixing halfbody 63A by the crankshaft direction left side, and is moving axially freely.This movable halves 63B is also with bent axle 51 rotations, and effect by means of the counterweight roller 70 that under action of centrifugal force, moves along centrifugal direction, endwisely slipping, near or away from fixing halfbody 63A, change is clamped in the winding radius of two V-type bands 68 between pulley half 63A, the 63B.

The driven pulley 67 of variable v-belt drive 60 has fixedly halfbody 67A and the movable halves 67B with 64 rotations of driven belt wheel shaft, and fixedly halfbody 67A is configured in than movable halves 67B by axial left side.Movable halves 67B moves the right part be configured in driven belt wheel shaft 64 freely in the axial direction by ring-type slider 71, by means of helical spring force application part 72 to left (the fixedly halfbody 67A one side) application of force.Therefore, when the winding radius of the V-type band 68 between two halfbody 63A, the 63B being clamped in driving pulley 63 becomes big, on the contrary, overcome the application of force of helical spring 72, interval between two halfbody 67A, the 67B of driven pulley 67 is enlarged, the winding radius of V-type band 68 is diminished, realize automatic stepless change.

Driven belt wheel shaft 64 by centrifugal clutch 80 with transmission of power to the reduction gear 81 that is provided in the crankcase 24, described centrifugal clutch 80 is equipped between right crankcase 24B and inboard speed changer case 61A in the formed space.

Centrifugal clutch 80 is the wet-type centrifugal clutch that each several part are lubricated and cool off with engine oil, possess clutch inner ring 83 and the clutch outer 85 chimeric with driven belt wheel shaft 64 splines, this clutch outer 85 links with the clutch output gear 84 that relative rotation is arranged on the left part of driven belt wheel shaft 64 freely, and a plurality of supporting axles 86 distolateral in the periphery that is based in clutch inner ring 83 are provided with clutch weight 87.Therefore, when the rotational speed of driven belt wheel shaft 64 surpasses under the situation of fixing speed, the clutch weight 87 that moves along centrifugal direction under centrifugal action cooperates with clutch outer 85, and clutch outer 85 and driven belt wheel shaft 64 are rotated integratedly, makes clutch output gear 84 rotations.

Reduction gear 81 is the transmission of power that are used for carrying out between the output shaft 31 of variable v-belt drive 60 and motor 20, and is the mechanism that has as a reducing gear performance function.This reduction gear 81 has intermediate gear shaft 91, this intermediate gear shaft 91 is arranged between driven belt wheel shaft 64 and the output shaft 31, the rotation that is located at the described clutch output gear 84 on the driven belt wheel shaft 64 is slowed down with the reduction speed ratio of regulation, and it is passed to output shaft 31.

Intermediate gear mechanism 91 has and connects axial region 91A, and this perforations axial region 91A rotates the earth's axis freely and is bearing on the pairing left and right bearing (rolling bearing) 92,92 by left and

right sides crankcase

24A, 24B supporting, and the wall portion of perforation right crankcase 24B.On this perforation axial region 91A, be fixed with and be located at the big footpath counter shaft driven gear 93 of clutch output gear 84 engagements on the driven belt wheel shaft 64, be fixed with and be fixed on the path countershaft drive gear 94 of the output shaft gear 31A engagement on the output shaft 31 in the space between left and right sides crankcase 24A, 24B.Thus, intermediate gear shaft 91 is passed through in the rotation that will be positioned at the clutch output gear 84 in crankcase 24 outsides, is delivered on the output shaft 31 that is positioned at crankcase 24 with the reduction speed ratio of stipulating.In addition, as shown in the figure, also support by the pairing left and right bearing (rolling bearing) 96,97 that is bearing on left and right sides crankcase 24A, the 24B for output shaft 31.

As shown in Figure 2, in the crankcase 24 of this motor 20, be provided with oil pump 100, supply to the each several part of motor 20 being stored in engine oils in the crankcase 24.This oil pump 100 is located at the oblique below in bent axle 51 the place aheads, drive by means of the rotation of bent axle 51, discharge engine oil, this engine oil is supplied in each bearing such as bearing 45,45 of supporting crankshaft 51, active valve mechanism (not shown), centrifugal clutch 80 and the reduction gear 81 etc. of cylinder portion 22.

Below, the cooling construction of this motor 20 is described.

Being provided with on every side of cylinder portion 22 at this motor 20 is mainly used in a plurality of radiating fin 22A that cool off cylinder portion 22.These radiating fin 22A extends around cylinder portion 22, and, form many pieces on cylinder-bore axis L1 direction devices spaced apart ground, thereby increase the surface area of cylinder portion 22.Thus, increased the heat exchange area with outer gas, cooled off cylinder portion 22 enough effectively by means of the running wind of side flow before car body.

In addition, this motor 20 is provided with oil cooler 105 (with reference to Fig. 2), and the engine oil of the each several part in 105 pairs of lubricated crankcases 24 of this oil cooler cools off.This oil cooler 105 comprises: the oil cooler main body (extension part) 106 that roughly extends to the car body front side from speed changer case 61 along cylinder-bore axis L1; And be linked to oil cooler cover (oil circuit cover) 107 on this oil cooler main body 106 with bolt, between forms oily path (oil circuit) 108 roughly long, roughly ring-type that fore-and-aft direction is short, that tilt along the front above-below direction of crankcase 24.The car body outside (the cylinder outside) and inboard (cylinder side) at oil cooler 105 are provided with radiating fin 109 (cylinder side radiating fin, not shown), increase surface area by means of these radiating fin 109, can carry out the cooling of engine oil effectively by the wind that travels that flows towards motor 20.In addition, owing to increased the section factor of oil cooler cover 107 and oil cooler 105 by means of radiating fin 109, so, also can improve the rigidity of oil cooler 105.

As shown in Figure 3, in this motor 20, be formed with the clutch chamber R1 that is used to accommodate centrifugal clutch 80, be formed with the speed changer chamber R2 that is used to accommodate variable v-belt drive 60 on the right side of this clutch chamber R1 on the right side of crankcase 24.Space (R0 of crankshaft room) in the inside of this clutch chamber R1 and the crankcase 24 is communicated with, with the R0 of crankshaft room, in abutting connection with ground formation engine oil between wherein chamber.In addition, do not have engine oil between wherein speed changer chamber R2 owing to be formed with between the right side of wherein chamber at this engine oil, thus on the vehicle-width direction, can clearly mark off engine oil between wherein chamber and engine oil not between wherein chamber.

In the R2 of this speed changer chamber, promptly in speed changer case 61, import the cooling air that is useful on cooling variable v-belt drive 60.That is, aspiration inlet 115 (with reference to Fig. 2 and Fig. 3) outside the casing front upper part of speed changer case 61 is provided with, this outer aspiration inlet 115 is used for outer aspiration is gone in the speed changer case 61.Outside this, on the aspiration inlet 115 not shown cooling tube is installed, upstream-side-end at this cooling tube is provided with air-strainer (stepless speed variator air-strainer) 120 (with reference to Fig. 1), the outer gas that utilizes this air-strainer 120 to purify as cooling air, is imported in the speed changer case 61.

Be provided with wind-guiding blade 63C on the fixedly halfbody 63A of the driving pulley 63 in being disposed at speed changer case 61, and, in speed changer case 61, be provided with: will direct into right-hand next door 116 of bent axle 51 from the air that outer aspiration inlet 115 imports; And will be directed to the wind deflector 117 of wind-guiding by the air that this next door 116 imports with interior all sides of blade 63C.Thus, make under the situation of wind-guiding with blade 63C rotation, suck air (cooling air), from interior all side direction blade 63C outer circumferential side air-supplies of blade 63C from outer aspiration inlet 115 in rotation by driving pulley 63.In addition, also be provided with wind-guiding blade 67C on the fixedly halfbody 67A of the driven pulley 67 in speed changer case 61, the wind-guiding that drives by means of the rotation of driven pulley 67 is with the rotation of blade 67C, with the guiding of the cooling air in the speed changer case 61 driven pulley 67 sides, and, discharge from the outer gas exhaust port that is arranged on assigned position, variable v-belt drive 60 integral body are cooled off.

And then, in speed changer case 61, being provided with radiating fin 130, this radiating fin 130 dispels the heat the heat of this speed changer case 61 in speed changer case 61.Detailed description is, this radiating fin 130 comprises the first radiating fin 130A and the second radiating fin 130B that is wholely set, wherein, the first radiating fin 130A be wholely set on the inboard speed changer case 61A of speed changer case 61, extend with the concentric circles ground of the rotating band wheel shaft 51A of variable v-belt drive 60 and on the car body right side with the outstanding raised line of ring-type; The second radiating fin 130B is a plurality of (being 3 the in this example) raised line that extends and give prominence to ring-type on the car body right side with driven belt wheel shaft 64 concentric circles.These radiating fin 130A, 130B are owing to be arranged on the inboard speed changer case 61A, so will be delivered to the heat of speed changer case 61, for example the heat of crankcase 24 (heat that produces during motor 20 combustion strokes or the frictional heat of power-transmission system, the heat of engine oil) etc. is utilized by the cooling airs in this case 61 and is rejected heat to the outside.That is to say, can the heat in the crankcase 24 be discharged to the outside forcibly, can carry out so-called forced air-cooling, promote the cooling of motor 20 motor 20 by means of the cooling air that in speed changer case 61, flows forcibly.

And, because these radiating

fin

130A, 130B are located at rotating band wheel shaft 51A side and driven belt wheel shaft 64 sides, so the front and back of crossing over speed changer case 61 all dispose radiating fin, can increase heat exchange area.And then, because these radiating

fin

130A, 130B are along the wind-guiding of driving pulley 63 blade with the sense of rotation of

blade

63C and 67C, so, can be effectively carry out heat exchange with the cooling air that rotation produced of

blade

63C and 67C with wind-guiding.Like this, can promote the cooling of motor 20 effectively.In addition, because these blade 130A cylindraceous, 130B have increased the section factor of speed changer case 61, in other words, because it plays a role as strengthening rib, so, improved the rigidity of speed changer case 61, its result, when improving motor 20 rigidity, also can reduce from motor 20 interior engine operation noises to outer transmission.

And then, in this structure, as shown in Figure 2, the following LL1 of speed changer chamber R2 is positioned at the top of motor 20 bottom LL2, on the lateral parts between this speed changer chamber R2 and the motor 20 bottom LL2, that is, on the side face 61A1 below the R2 of the speed changer chamber of inboard speed changer case 61A, also be provided with the radiating fin 135 that extends along fore-and-aft direction with straight line shape.Thus, the heat of speed changer case 61 (heat of crankcase 24 etc.) is also cooled off with being exposed to outside radiating fin 135, also can utilize the wind that travels to promote the cooling of motor.

Below, be described in detail the pedaling starting arrangement of this motor 20.

Fig. 4 is the schematic representation in IV-IV cross section in the presentation graphs 2, simultaneously with on every side structure, also shows mechanism's part (stepping starting mechanism 140) of pedaling starting arrangement.This steps and plays the below (mainly being the below of crankcase 24) that mechanism 140 is housed in motor 20.

Step axle 38 and observe from vehicle body side and be positioned at (with reference to Fig. 2) under the driven belt wheel shaft 64, can axle be supported on left and right sides crankcase 24A, 24B in the formed bearing portion (being formed in the sliding bearing in the through hole in this example) 141,142 and slide freely.This steps axle left part of 38 and connects bearing portion 141 in the wall portion that is formed on left crankcase 24A and outstanding to left, is fixed with the base end part that steps arm 39 on this perforation axial region 38A, steps on the front end of arm 39 pedal 40 is installed.In addition, be provided with the sealed member 143 that stops up it and step the gap between the axle 38 on the left crankcase 24A.In this crankcase 24, step axle 38 right side branch be equipped with towards with the side of stepping in the opposite direction to stepping the Returnning spring 145 of 38 application of force; And make the axle 38 that steps that rotates by the application of force of this Returnning spring 145 step the stop component 146 that the operation initial position stops.Step axle 38 left part be provided with the big footpath of bearing portion 141 adjacency step actuation gear 147.

Between this steps axle 38 and bent axle 51, dispose will step a rotation of spools 38 be delivered to and step jack shaft 150 on the bent axle 51.The jack shaft 150 of stepping in this structure is cross-compound arrangement, has by what step that axle 38 rotations drive first to step jack shaft 151 and first rotation that steps jack shaft 151 is delivered to second on the bent axle 51 and step jack shaft 155.

As shown in Figure 2, first steps jack shaft 151 observes landscape configuration below the neutral position of driven belt wheel shaft 64 and bent axle 51 from vehicle body side, as shown in Figure 4, rotating freely, the earth's axis is bearing in the left and right sides bearing portion (being the sliding bearing that forms at non-through hole in this example) 161,162 that is arranged on left and right sides crankcase 24A, the 24B.This first steps jack shaft 151 and is housed in fully in the crankcase 24, form with first of the path that steps actuation gear 147 engagements and step counter shaft driven gear 163, and, be fixed with in the right-hand adjacency of this gear 163 and step first of the big big footpath of counter shaft driven gear 163 diameters than first and step countershaft drive gear 164.

As shown in Figure 2, second steps jack shaft 155 observes landscape configuration below bent axle 51 from vehicle body side, as shown in Figure 4, by being arranged on 166,167 supportings of pairing left and right bearing portion (being the sliding bearing that forms at non-through hole in this example) on left crankcase 24A and the inboard speed changer case 61A and rotating freely.That is to say, this second steps jack shaft 155 and steps the longer axle of jack shaft 151 by forming than first, and under the state that its left part is bearing on the left crankcase 24A, perforation is formed on the opening portion 24B1 in the wall portion of right crankcase 24B and extends, it extends the space between axial region 155A leap crankcase 24 and the speed changer case 61, and axle is bearing on the inboard speed changer case 61A.On this second axial region that steps in the crankcase 24 of jack shaft 155, be formed with and first step path second counter shaft driven gear 168 that first of jack shaft 151 steps countershaft drive gear 164 engagements, be equipped with the gear mechanism 170 of beating on the extension axial region 155A outside this steps the crankcase of jack shaft 155.

This beats gear mechanism 170 between right crankcase 24B and inboard speed changer case 61A, possesses: step jack shaft 155 at the gear 171 of beating that axially is provided with respect to second with moving freely; And force application part 173,173 pairs of this force application parts gear 171 application of forces of beating, this gear 171 of beating is in not and is located at having stepped on the bent axle 51 and employs the retreating position of driven gear 172 engagements, second rotation that steps jack shaft 155 when stepping, the gear 171 of beating slides, and employs driven gear 172 and mesh with having stepped.In addition, in illustrated embodiment, use helical spring situation though show force application part 173,, can also use helical springs such as leaf spring or dish spring parts in addition.

Thereby, step on pedal 40 by stepping on, step axle 38 and overcome application of forces when rotation of Returnning spring 145, stepping axle 38 rotation steps the gear biographies that jack shaft 151 and second steps jack shaft 155 by first and passs, make the gear 171 of beating towards employing the direction that driven gear 172 meshes and move with having stepped, force bent axle 51 rotations, thereby can pilot engine 20.

At this, Fig. 5 (A), (B) show second and step jack shaft 155.Second steps jack shaft 155 is respectively equipped with at two ends and is inserted into the shaft end 156,157 that is formed in the bearing portion 166,167 that left crankcase 24A and inboard speed changer case 61A go up separately, on the axle main part 158 between the shaft end 156,157 at these two ends, form in turn from left end side: formation and first steps the 158A of tooth portion of second counter shaft driven gear 168 of jack shaft 151 engagements; Diameter is less than the minor diameter part 158B of the 158A of this tooth portion; Diameter is greater than the large-diameter portion 158C of this minor diameter part 158B.This minor diameter part 158B steps jack shaft 155 second and is assembled under the state on the motor 20 (with reference to Fig. 4), forms with the counterweight 52 discontiguous diameters with the part of bent axle 51.

In addition, large-diameter portion 158C comprises: with the diameter formation roughly the same with the opening portion 24B1 that is located at right crankcase 24B, step jack shaft 155 second and be assembled under the state on the motor 20 (with reference to Fig. 4), in the perforation position of opening portion 24B1 and less than the perforation axial region 158C1 in the gap between itself and the opening portion 24B1; And the gear assembly department 158C2 that the gear 171 of beating is installed sliding freely.

When assembled engines 20, any side at left and right sides crankcase 24A, 24B is assembled the supporting axle of power-transmission system or the supporting axle of starting system, crankcase 24A, the 24B of itself and opposite side are linked, afterwards, assembling miscellaneous part (cap assemblies such as the gear mechanism of beating, centrifugal clutch 43, speed changer case 61, variable v-belt drive 60 etc.).

In this motor 20, because second steps jack shaft 155 by left crankcase 24A and inboard speed changer case 61A supporting, so after assembling left and right sides crankcase 24A, 24B, before assembling speed changer case 61, second steps jack shaft 155 connects right crankcase 24B, the one end is in non-bearing state, so second steps jack shaft 155 might extract from crankcase 24.Extract from crankcase 24 if second steps jack shaft 155, then in crankcase 24, owing to step a near part (counterweight 52) that has bent axle 51 placement position of jack shaft 155 second, therefore, need to adopt and to step jack shaft 155 is inserted into the extremely very complicated the bearing portion 166 of left crankcase 24A from the outside of crankcase 24 operation second.

At this, in the present embodiment, second steps jack shaft 155 is provided with wide diameter portion 160 in the face of the opening portion 24B1 of right crankcase 24B, to comprise when the supporting axle of power-transmission system and second supporting axle that steps the starting system of jack shaft 155 are assembled on the crankcase 24, by this wide diameter portion 160, can step jack shaft 155 with second and be assembled into crankcase 24 1 sides (right crankcase 24B) temporarily.

In detail, as shown in Figure 5, this wide diameter portion 160 is made the big footpath flange shape of diameter greater than the opening portion 24B1 of right crankcase 24B, is arranged on second left end that steps the perforation axial region 158C1 of jack shaft 155.As shown in Figure 3, the position that is provided with this wide diameter portion 160 is assembled under the situation on the crankcase 24 stepping jack shaft 155 with second, is equivalent near the opening portion 24B1 of crankcase 24B and the position of crankcase 24 inboards.

Therefore, stepping jack shaft 155 when being assembled on the crankcase 24 with second, wide diameter portion 160 is positioned at the opening portion 24B1 inboard of right crankcase 24B, as preventing that second steps jack shaft 155 and play a role from the anti-portion of pulling out that right crankcase 24B extracts.That is to say, if stepping jack shaft 155 with second is assembled in left and right sides crankcase 24A, the 24B, second step jack shaft 155 by means of wide diameter portion 160 with the opening portion 24B1 place of its position limit at right crankcase 24B, it can not be extracted from

crankcase

24A, 24B, can not fall down yet.Like this, can step jack shaft 155 with second is assembled on the crankcase 24 and the location temporarily.

And, owing near the inboard of the opening portion 24B1 of right crankcase 24B, the space of very little free time is arranged between bent axle 51 and right crankcase 24B, so, can effectively utilize this idle space, wide diameter portion 160 is made the flange shape in bigger footpath.Therefore, can guarantee and the part (counterweight 52) of bent axle 51 between the space that separates is arranged, also can assemble second reliably temporarily and step jack shaft 155.

In addition, shown in Fig. 5 (B), this wide diameter portion 160 forms to establish the flange shape (being D type flange shape in this example) with notch 161 on the part.In view of the above,, can make the position of this notch 161 leave the part (counterweight 52) of bent axle 51 more reliably, avoid easily and the contacting of bent axle 51, can carry out the second interim assembling that steps jack shaft 155 by the position of this notch 161 being adjusted to bent axle 51 sides.

Because can step jack shaft 155 with second in such a manner is assembled on the crankcase 24 temporarily, so can avoid second to step jack shaft 155 and from crankcase 24, extract, contact with the miscellaneous part in the crankcase 24, also need not carry out stepping jack shaft 155 again and insert very complicated operation in the bearing portion 166 of left crankcase 24A second, in addition, because do not need to use the special instrument of interim assembling usefulness yet, so, the increase of parts numbers of packages avoided.

As mentioned above, according to present embodiment, because second on the opposite side (left crankcase 24A) that is supported on crankcase 24 and the speed changer case 61 steps jack shaft 155 and is provided with wide diameter portion 160 in the face of the opening portion 24B1 of right crankcase 24B, so, when the supporting axle that will comprise power-transmission system or second supporting axle that steps the starting system of jack shaft 155 are assembled on the crankcase 24, neither increase anchor clamps or parts number of packages, can step jack shaft 155 with second again temporarily and be assembled on the crankcase 24.

And, because second steps the below that jack shaft 155 is positioned at bent axle 51, the opening portion 24B1 of crankcase 24 disposes with the part of bent axle 51 is approaching under side-looking, because wide diameter portion 160 forms the flange shape of downcutting a part, with the part (counterweight 52) that can avoid bent axle 51, so can avoid and the contacting of bent axle 51, also can carry out the second interim assembling that steps jack shaft 155.

In addition, owing to be supported under the opposite side and the state on the speed changer case 61 of crankcase 24 stepping jack shaft 155 with second, wide diameter portion 160 is between the counterweight 52 and crankcase 24 of bent axle 51, dispose wide diameter portion 160 so can effectively utilize the counterweight 52 and the space of the free time between the crankcase 24 of bent axle 51, in addition, wide diameter portion 160 is maximized, assemble second more reliably temporarily and step jack shaft 155.

Below, the configuration structure of the oil gauge of this motor 20 is described.

As shown in Figures 3 and 4, in this motor 20, contain generator (AC Generator (ACG)) 180 in the space (generator containing room) that between left crankcase 24A and generating hood 25, is communicated with.Generator 180 comprises rotor 181 that is fixed on the bent axle 51 and the stator 182 that is configured in the rotor 181, and stator 182 is fixed on the generating hood 25.

Be connected with overrunning clutch 183 on rotor 181, overrunning clutch 183 is provided with by the driven gear 185 of intermediate gear 184 with the actuation gear 41A engagement of starting motor 41.In addition, between this driven gear 185 and bearing 45, dispose cam chain driving sprocket wheel 55.

This generator 180 is the wet type generators that are lubricated and cool off with engine oil, stores engine oil in generating hood 25.

Generating hood 25 have generator 180 that covering stretches out from the opposite side (left side) of bent axle 24 around and the roughly bowl-shape cover main body 25A of side (left side side), use bolton on crankcase 24 by a plurality of bolt linking departments (not shown) that will form along this periphery devices spaced apart ground that covers main body 25A, the hood 25 that should generate electricity is fixed on the crankcase 24.In addition, when the hood 25 that will generate electricity is fixed on the crankcase 24, be inserted with the sealed member that plays a role as oil seal therebetween.

This cover main body 25A has the base end part top from generator covering part 25B of the tube portion of the roughly cylinder that covers generator 180 and observes the top extension part 25C that the general triangular shape extends with the side, as shown in the figure, extension part 25C motor gear covering part of being arranged in the gear row (the gear row that actuation gear 41A, intermediate gear 184 and driven gear 185 are formed) of the starting motor 41 of left crankcase 24A left side side as covering in this top plays a role.

On generating hood 25, on the part in car body of extension part 25C outside above this (car body left side), promptly be provided with the pouring orifice 190 of engine oil at the upper section of generator covering part 25B, inboard at this pouring orifice 190 is formed with internal thread part, be threaded with this internal thread part by the oiling flap 196 that will have oil gauge 195, this oil gauge 195 is installed in dismounting freely.In this case, because pouring orifice 190 is located on the car body outside (car body left side) of the top extension part 25C of generating hood 25, so, under side-looking, pouring orifice 190 and oiling flap 196 are overlapping with top extension part 25C, the motor 20 that produces by such layout design concavo-convex sees that in appearance performance do not come out, and avoided the change significantly of motor outward appearance.

Below, the ventilating structure of motor 20 is described.

Fig. 6 is the figure that (car body right side) observes right crankcase 24B from the outside, and Fig. 7 is the figure that observes from inboard (car body left side).In addition, Fig. 8 is the figure that observes left crankcase 24A from the inboard.On left crankcase 24A and right crankcase 24B, under situation about linking mutually, between this

case

24A, 24B, have the left ventilation chamber 200A and the right ventilation chamber 200B that form ventilation chamber 200 respectively.

As shown in Figure 6, right ventilation chamber 200B forms to the crankcase right side is outstanding with the upper area of opening portion 64D through the driven belt wheel shaft of the driven belt wheel shaft 64 that is used for support right crankcase 24B.In addition, as shown in Figure 8, left ventilation chamber 200A is arranged on the opposed zone of right ventilation chamber 200B with left crankcase 24A.That is each when, ventilation chamber about 200 two being cut apart forms with left and right sides crankcase 24A, 24B respectively.In addition, among the figure, symbol 91D represents the intermediate gear shaft opening portion of intermediate gear shaft 91 supporting usefulness, and symbol 31D represents the output shaft opening portion of output shaft 31 supporting usefulness, and symbol 51D is the bent axle opening portion of bent axle 51 supporting usefulness.

As Fig. 6 and shown in Figure 2, the vent openings portion 201 of ventilation chamber 200 is arranged on the right crankcase 24B (right ventilation chamber 200B).More particularly, as shown in Figure 2, this vent openings portion 201 is arranged on the forward side and down of driven belt wheel shaft 64, this towards be equivalent to the direction opposite with the sense of rotation of driven belt wheel shaft 64 towards.That is, driven belt wheel shaft 64 is observed rotation in a clockwise direction from the car body right side, and in vent openings portion 201, the sense of rotation opposite direction ground formation with this driven belt wheel shaft 64 prevents the intrusion of motor wet goods.

As shown in Figures 7 and 8, right ventilation chamber 200B and left ventilation chamber 200A separate inside with a plurality of next doors, form a plurality of chambers (having in this example: the first Room 200B1,200A1, the second Room 200B2,200A2, the 3rd Room 200B3,200A3, fourth ventricle 200B4,200A4, the 5th Room 200B5,200A5) that are interconnected when linking each ventilation chamber.

Wherein, in right ventilation chamber 200B, as shown in Figure 7, between the 3rd Room 200B3 and fourth ventricle 200B4, and be communicated with by narrow communication paths between fourth ventricle 200B4 and the 5th Room 200B5, other chamber 200B1,200B2 separated with the next door fully.On the other hand, in left ventilation chamber 200A, as shown in Figure 8, be communicated with narrow communication paths between the first Room 200A1 and the second Room 200A2,200A3～200A5 separates with the next door fully with other chambers.

Therefore, vent openings portion 201 from be located at right ventilation chamber 200B enters the high-pressure air of the first Room 200B1 and 200A1, after left ventilation chamber 200A moves by side to the second Room 200B2 and the 200A2, move by side to the 3rd Room 200B3 and 200A3, fourth ventricle 200B4 and 200A4, the 5th Room 200B5 and the 200A5 from right ventilation chamber 200B in turn, be discharged in the air-strainer 28 through the not shown breathing pipe on the opening portion (exit opening portion) 210 of the 5th Room 200A5 that is connected to terminal ventricle.

That is, each chamber of this ventilation chamber 200 plays a role as the other end expansion chamber, and the high-pressure air with in the crankcase 24 passes through each chamber of each ventilation chamber 200 in turn, when slowly becoming low pressure, suppresses the variation (pulsatile change) of pressure.And, comprise that the access of each chamber forms with crooked up and down complications structures (labyrinth structure), so, ventilation path can be prolonged in limited space effectively, can more effectively reduce high-pressure air, in other words, can make ventilation chamber 200 miniaturizations.And, because ventilation chamber 200 and crankcase 24 is integrally formed, so, compare with the situation of parts formation that ventilation chamber 200 usefulness are other, reduced the parts number of packages, make motor 20 integral miniaturization.

More than, though based on a mode of execution the present invention has been described,, the present invention is not limited thereto, and can carry out various design variations.For example in the above-described embodiment, although understand wide diameter portion 160 and second is stepped the integrally formed situation of jack shaft 155, but being not limited to this, wide diameter portion 160 for example can also use circlip (C ring etc.) individual components formation.In addition, in the above-described embodiment, be applicable to that possessing first steps the situation of starting arrangement that jack shaft 151 and second steps the motor 20 of jack shaft 155 although understand the present invention, but, be not limited to this, the present invention is applicable to that also stepping jack shaft is engine starting gear more than one or 3.Mainly be that the starting arrangement that possesses the motor that steps jack shaft of opposite side by crankcase and the supporting of speed changer case can be widely used in enforcement the present invention.

In addition, in the above-described embodiment, although understand the situation that steps the formations of jack shaft 155 interim assemblings with second, but, be not limited to this, situation with the structure of the interim assembling of spindle unit other supporting axles of the supporting axle of power-transmission system or starting system, that be arranged in parallel with bent axle also extensively is suitable for implementing the present invention.Promptly, cover the casing (for example the speed changer case 61) of power transmission member, comprise crankcase and the position between the power transmission member (for example inboard speed changer case 61A) a side, one end of the spindle unit that be arranged in parallel with bent axle 51 is inserted in the opening (for example opening portion 24B1) that leads on the crankcase that is arranged at least one side, by covering the supporting of power transmission member casing, the other end of above-mentioned spindle unit is by the opposing party's crankcase supporting, under situation about so constituting, because this spindle unit is provided with above-mentioned wide diameter portion 160, so, can constitute the structure of interim this spindle unit of assembling.

In addition, in the above-described embodiment, although understand that the present invention is applicable to the situation of single-cylinder engine, but be not limited to this.In addition, also be not limited to the situation that the present invention is suitable for automatic two-wheeled cycle, also can be widely used in the internal-combustion engine of other vehicles such as three-wheeled vehicle in ATV (vehicle of the traveling on mountainous region) classification or four-wheel car.

Claims

1. internal-combustion engine, it has bent axle that is supported on the pairing left and right crankcase and the spindle unit that be arranged in parallel with this bent axle, is provided with power transmission member at an end of this bent axle, and is provided with the casing that covers this power transmission member, and described internal-combustion engine is characterised in that,

The casing that covers described power transmission member comprises at described crankcase of the side and the position between the described power transmission member, one end of the described spindle unit that be arranged in parallel with described bent axle passes the opening on the described crankcase that is arranged at least one side, and be supported on the casing that covers described power transmission member, the other end of described spindle unit is supported on the opposing party's the described crankcase, be provided with wide diameter portion on described spindle unit, described wide diameter portion is in the face of the opening on the described crankcase that is arranged on a side.

2. internal-combustion engine, it comprises: a pair of crankcase of supporting crankshaft; Be arranged at the speed changer case of covering speed changer of a side of this crankcase; Be supported on the axle that steps of this crankcase; Be supported on the jack shaft that steps of the opposite side of crankcase and speed changer case, pass to bent axle via stepping the rotation that jack shaft will step axle, described internal-combustion engine is characterised in that,

Be provided with in a side of described crankcase and make the described opening that jack shaft connects that steps, the described jack shaft that steps is provided with the wide diameter portion of facing with described opening by described opening and by the opposite side of described crankcase and in a side of described crankcase and the described speed changer case supporting between the described speed changer at the described jack shaft that steps.

3. internal-combustion engine according to claim 2 is characterized in that,

Describedly step the below that jack shaft is positioned at described bent axle, the described opening portion of described crankcase under side-looking with the part of described bent axle near configuration, described wide diameter portion is to have downcut a part of flange shape, can avoid the part of described bent axle.

4. according to claim 2 or 3 described internal-combustion engines, it is characterized in that,

The described jack shaft that steps is being supported under the opposite side and the state on the described speed changer case of described crankcase, and described wide diameter portion is between the counterweight and described crankcase of described bent axle.