CN1079760C - Mounting structure of starting motor for unit oscillating internal combustion engine - Google Patents

Abstract

The installation structure of the starter motor of the unit swing type internal combustion engine of the present invention can ensure a large degree of freedom in the space under the vehicle seat, shorten the distance between the wheel and axle, and have a large degree of freedom in the arrangement of the mechanism that exerts the basic performance of the internal combustion engine. The structure has a belt drive and is swayably supported relative to the vehicle body. The power cylinder protrudes forward from the crankcase at the front of the unit swing box; a cooling fan is provided on one side of the crankcase, and on the same side of the power cylinder There is a passage for blowing air from the cooling fan to the power cylinder; on the side opposite to the air supply passage of the power cylinder, a starter motor is arranged at a position overlapping with the power cylinder when viewed from the side; the power cylinder is located on the left and right sides connected to the front fork pipe between a pair of rear frames.

Description

The mounting structure of starting motor of unit oscillating internal combustion engine

The present invention relates to be contained on the motor bike, have a belt torque transfer and can be with respect to the unit oscillating internal combustion engine of vehicle body swing, the particularly installation constitution of Starting motor.

This kind unit oscillating internal combustion engine, for example on the books in special fair 5-68398 number of Japanese patent gazette.

Installation constitution such as Figure 13 and shown in Figure 14 of the Starting motor of this communique record.

Being configured in to bent axle 02 left and right horizontal the unit swings the front, center of case 01, makes power cylinder 04 that combustion engine 03 is set with protruding upward.

Hind axle props up in the rear portion of unit swing case 01 (figure does not show), and the driving of bent axle is passed to trailing wheel by belt gear.

Frame support bracket 05 forwards stretches out from the antetheca of unit swing case 01, and its front end is hinged on vehicle frame by pivot 06, and unit swing case 01 can be that the center swings up and down with trailing wheel with this pivot 06.Folder is being established buffer gear between the rear end of unit swing case 01 and the vehicle frame of its top.

Starting motor 07 is installed in the front portion of swinging case 01 on the unit swing case 01 in the unit, Starting motor 07 is installed in the left and right directions position (crank center C) identical with the Crankpin 02a of bent axle 02 and in the place ahead of Crankpin 02a, between power cylinder 04 and frame support bracket 05, axle drive shaft 07a is parallel to bent axle 02.

Starting motor 07 is installed in the front portion of unit swing case 01 from crank center C side (right side), between unit swing case 01 and left side case lid 08, setting up reducing gear axle 09, reducing gear 011 is entrenched on this reducing gear axle 09 rotationally, the gear wheel in large diameter 011a of reducing gear 011 and driven wheel 010 engagement that is formed on the axle drive shaft 07a of Starting motor 07, the start system gear 012 of the small diameter gear 011b of reducing gear 011 and bent axle 02 side meshes.

In this example, because swinging the front crankshaft case of case 01 from the unit, stretches out upward power cylinder 04, so the space of below-seat is restricted greatly.

When power cylinder being leaned forward, then exist the problem of disturbing with the rear portion vehicle frame in order to ensure the space of below-seat.For fear of this interference case 01 is swung when rearward mobile in the unit, then the wheel shaft lengthening.

In addition, as previously mentioned, when Starting motor 07 is provided in crank center C, identical with the left and right directions position of power cylinder 04 position float chamber guide valve type air gulp system mechanism and exhaust system mechanism thereof, thereby the mechanism of performance combustion engine basic function is subjected to Starting motor configuration restriction, and the degree of freedom of setting is defined.

In addition, because Starting motor 07 is installed in the outside of unit swing case 01, so, the mud that splashes when travelling and the fail-safe structure of water are set, the oil sealings in O shape ring, the sealing member motor etc. increase part.

If Starting motor is configured in the downside that case 01 is swung in the unit, then water proof structure must be tighter, and influence the angle of heel of motor bike.

Also the handlebar Starting motor is configured in the example (special fair 1-31036 number) in the unit swing case, in this example, power-transmission system is a linked transmission, and space more than needed is arranged between the speed reduction gearing at bent axle and rear, be configured in this space, different with the belt power delivery mode.

In this embodiment, the axle drive shaft of Starting motor points to fore-and-aft direction substantially, is not parallel to bent axle, so owing to want the conversion power direction, parts increase.

The present invention makes in view of the above problems, and its purpose is to provide a kind of mounting structure of starting motor of unit oscillating internal combustion engine.Installation constitution of the present invention can be guaranteed the big degree of freedom in below-seat space, and can shorten wheelbase, the mechanism of performance combustion engine key property that degree of freedom is set is big.

To achieve these goals, the mounting structure of starting motor of unit oscillating internal combustion engine of the present invention is used for motor bike, has the belt torque transfer and is supporting swingably with respect to vehicle body, it is characterized in that,

Power cylinder stretches out from the crankcase of swing case front portion, unit with leaning forward;

Side at crankcase has cooling fan, is provided with from the path of this cooling fan to the power cylinder air-supply at the homonymy of power cylinder;

With the air-supply path opposition side side of power cylinder, see the position configuration Starting motor that overlaps with power cylinder from the side;

Power cylinder with pair of right and left that front fork tube links to each other after between the vehicle frame.

Because power cylinder stretches out from crankcase with leaning forward, and with pair of right and left that front fork tube links to each other after between the vehicle frame, so, guarantee the big degree of freedom in below-seat space, can shorten wheel shaft.

Owing to be provided with from the air-supply path that cools off fan in a side at the power cylinder between the vehicle frame after the pair of right and left, the idle space configuration Starting motor of utilizing seeing from the side of opposition side to overlap with power cylinder, so, can realize the miniaturization of combustion engine, and the layout degree of freedom of the mechanism relevant with the combustion engine key property is big.

The invention of claim 2 record is in the mounting structure of starting motor of claims 1 described unit oscillating internal combustion engine, it is characterized in that, above-mentioned Starting motor is provided in the unit swing case.

Owing to needn't establish water proof structure in addition, the influence that water or mud splash in the time of being prevented to travel by unit swing case and case lid for Starting motor.

The invention of claim 3 record is in the mounting structure of starting motor of the described unit oscillating internal combustion engine of claim 1, it is characterized in that above-mentioned combustion engine has air suctiton inlet on the crankcase of crank arm periphery; Engine lifting bracket is located between air suctiton inlet and the power cylinder.

Air suctiton inlet is arranged on crankcase, and aspirate tube stretches out from this air suctiton inlet, between this air suctiton inlet and the power cylinder that leans forward, be provided with engine lifting bracket, be provided in compactly in the space on the crankcase, can realize the miniaturization of combustion engine and guarantee minimum terrain clearance.

Be positioned at the rear of the driving engine between vehicle frame after the pair of right and left, be provided with engine lifting bracket, the degree of freedom of connecting rod that connects back vehicle frame and engine lifting bracket is big.

The invention of claim 4 record is in the mounting structure of starting motor of the described unit oscillating internal combustion engine of claim 1, it is characterized in that, Starting motor has reducing gear between it and bent axle; The ventilation path shoulder of the bearing portion of reduction gear on crankcase.

Because the bearing portion of reduction gear avoids the ventilation path of crankcase, be positioned at shoulder, so, make Starting motor and reduction gear all near the power cylinder center configuration, can shorten the left and right sides width of combustion engine, dwindle the width between the vehicle frame after the pair of right and left of power cylinder both sides, make the vehicle body miniaturization.

The invention of claim 5 record is in the mounting structure of starting motor of each described unit oscillating internal combustion engine in claim 1 to 3, it is characterized in that Starting motor is configured in the power cylinder line of centers downside of power cylinder one side; Power cylinder line of centers upside in the same side of power cylinder is provided with the hot blast path that leads to carburettor.

Because in a side of power cylinder, disposing Starting motor at power cylinder line of centers downside, the hot blast path passes upside, the hot blast path can be lumped together with Starting motor compactly, can guarantee the hot blast path and make the power unit miniaturization.

Fig. 1 is motor-scooter type moped 1 the lateral plan that has the unit oscillating internal combustion engine of one embodiment of the invention.

Fig. 2 is a view, the local section of expression swing unit bonded assembly shaft portion on the vehicle frame.

Fig. 3 is the cross sectional drawing along III-III line among Fig. 1.

Fig. 4 is the cross sectional drawing along combustion engine powered cylinder line of centers.

Fig. 5 is the lateral plan that unloads the swing unit behind the transmission-case cover.

Fig. 6 is the anterior top view of swing unit.

Fig. 7 is the lateral plan of unit swing case.

Fig. 8 is the cross sectional drawing along VIII-VIII line among Fig. 7.

Fig. 9 is the lateral plan of guard shield.

Figure 10 is the lateral plan of hot air duct.

Figure 11 is the top view of hot air duct.

Figure 12 be another embodiment swing unit want portion's cross sectional drawing.

Figure 13 is the cross sectional drawing of the existing mounting structure of starting motor of expression.

Figure 14 is the cross sectional drawing along XIV-XIV line among Fig. 13.

Below, referring to figs. 1 through Figure 11 one embodiment of the present of invention are described.

Fig. 1 is motor-scooter type moped 1 the lateral plan that has the unit oscillating internal combustion engine of one embodiment of the invention.

Body forward structure 2 and body tail 3 are connected by low base plate 4, as the vehicle frame 5 of body framwork by front vehicle frame 5a, pair of right and left level frame 5b, 5b and pair of right and left after vehicle frame 5c, 5c constitute.Front vehicle frame 5a descends from body forward structure.Pair of right and left level frame 5b, 5b are branched off into 2 strands in the lower end of front vehicle frame 5a, extend back from the below of base plate 4.Vehicle frame 5c, 5c erect from the rear portion of each level frame 5b, 5b after the pair of right and left, to oblique rear extension.

Above the back vehicle frame 5c of body tail 3, be provided with vehicle seat 6, setting at the downside of vehicle seat 6 and accommodating case 7.

At body forward structure 2, the steering head 9 that top has handlebar 8 is being set, downside hangs front-wheel 11 by front fork 10, by handlebar 8 steerings.Vehicle frame 5c, 5c after the pair of right and left of vehicle frame 5, erect obliquely upward steep dip, flat pitch ground, crooked again back rearward extends, the curve that carriage 12,12 is fixed on about this, between carriage 12,12, setting up pivot 13, the prominent pair of right and left of establishing hangs carriage 17,17 on the unit of swing unit 15 swing case 16 anterior, with linkage component 14 above-mentioned pivot 13 and suspension carriage 17,17 is coupled together.

As Fig. 2 and shown in Figure 4, linkage component 14 usefulness link 14c connect front end sleeve 14a and constitute with back end pivoting 14b, front end sleeve 14a props up on the pivot 13 of vehicle frame by the rubber bush 13a axle that is pressed in it, and back end pivoting 14b is propping up a pair of suspension carriage 17,17 of swing unit 15 sides by rubber bush 17a, 17a axle.

Protrusion tab 14d is forwards outstanding from the middle position of front end sleeve 14a, crossbeam 5d is erected between side back vehicle frame 5c, the 5c, basket 5e is fixed on the central authorities of this crossbeam 5d, setting-in rubber elastomer 5f in this basket 5e is embedded in this rubber elastomer 5f from the forebody of the outstanding protrusion tab 14d of front end sleeve 14a.

Therefore, vehicle frame 5 flexibly limits the rotation of hinged linkage component 14 on pivot 13 by rubber elastomer 5f.

Because the effect of this linkage component 14, the preceding upper lateral part of swing unit 15 is by back vehicle frame 5c supporting and can swing up and down, at the rear of linkage component 14, and vehicle frame 5 between folder establishing posterior bumper 19.

The front portion of the unit swing case 16 of swing unit 15 constitutes crankcase 16a and is provided with combustion engine 20 integratedly, is propping up trailing wheel 21 in rear axle, and the power of combustion engine 20 is delivered to trailing wheel 21 by the belt gear 22 with automatic speed changing function.

Fuel Tank 23 sets up and is fixed between level frame 5b, the 5b of base plate 4.

Combustion engine 20 is 2 stroke IC engines, and power cylinder 25 forwards stretches out until approaching level from crankcase 16a with leaning forward, and this power cylinder 25 connects ground between the steep rake of vehicle frame 5c, 5c after the pair of right and left.

Combustion engine 20 is that the employing pilot valve is located at the crankcase pilot valve mode on the crankcase.As shown in Figure 4, periphery at crankshaft cheek 36b, formation air suctiton inlet 16g above crankcase 16a, pilot valve 26 is flush-mounted on the air suctiton inlet, aspirate tube 27 stretches out with carburettor 28 from air suctiton inlet 16g and is connected, as shown in Figure 1, the airfilter 29 that is positioned in swing case 16 rear portions, unit is connected with carburettor 28, to import air.

Fig. 4 rearward extends after stretching out also bending in the left side from the air suctiton inlet 16g that is formed at crankcase 16a upper central position obliquely upward to aspirate tube 27 shown in Figure 6, is connected with carburettor 28 by the 27a of butt flange portion.

At crankcase 16a, upper central has air suctiton inlet 16g, and power cylinder 25 forwards stretches out, the position, the left and right sides between air suctiton inlet 16g and power cylinder 25, and a pair of suspension carriage 17,17 is outstanding upward.

The freeing pipe 30 that stretches out downwards from power cylinder 25 bottoms of combustion engine 20 towards the rear and walk around the below of crankcase 16a from the right side, is connected (see figure 1) with the noise silencer 31 that is provided in the vehicle body right side.

In the rear end of the level frame 5b of base plate 4, leg 33 is articulated in the front end 33 of carriage 32 of the rising portions of back vehicle frame 5c.

Fig. 3 is the cross sectional drawing that dissects and launch along III-III line among Fig. 1, and the part of swing unit 15 is different with Fig. 1.

Unit swing case 16 is divided into left cell case 16L and right sided cell case 16R at front side crankcase 16a, and two Cell 16L, 16R connect with bolt 35.

The front portion of unit swing case 16 is equivalent to crankcase 16a, forwards stretches out at its anterior power cylinder 25.

In crankcase 16a, bent axle 36 is rotatably being supported by the main bearing 37L that is contained in the main bearing 37R on the right Cell 16R and be contained on the left cell case 16L, and direction is extended to the left and right, and stretch out to foreign side from crankcase 16a at its two ends.

The crank pin 36a of pistons reciprocating 24 and bent axle 36 is connected by pipe link 34 in the 25a of the power cylinder hole of power cylinder 25.

As shown in Figure 3 and Figure 4, be provided with the exhausr port 25b and the scavenge port 25c that are opened and closed by piston 24 on the 25a of power cylinder hole, exhausr port 25b is connected with freeing pipe 30 at downside, scavenge port 25c about reach upside and be communicated with the path 25d that takes a breath.

During the upward stroke of piston 24, the negative pressure that produces in the 16a of crankcase portion is opened pilot valve 26, mixture gas is inhaled in the 16a of crankcase portion from carburettor 28, is compressed in the descending stroke of piston 24, and 25d supplies to combustion side power cylinder hole 25a from scavenge port 25c by the ventilation path.

Electrical generator 38 and cooling fan 39 are installed in the right part of bent axle 36, the drive pulley 40 of belt gear 22 are installed, be provided with starting free-wheel clutch 41 on the right side of drive pulley 39 at left end.

Starting free-wheel clutch 41 is roll-type free-wheel clutchs, wheel 42a on starting driven gear 42, forming, take turns 42a and bearing 43 relative rotations and form camming surface at inner peripheral surface by interior with bent axle 36 all-in-one-piece foreign steamers 44, roller 45 is folded in and the interior 42a of wheel between (see figure 3).

Left cell case 16L, transmission wall 16b rearward extends from the 16a of crankcase portion, the left side open surface is topped by transmission-case cover 47 by packing seal 46, belt gear 22 is contained in its inside, the rotation of bent axle 36 is delivered to driven shaft 51 through drive pulley 40, vee-belt 48, driven pulley 49, power-transfer clutch 50, and the rotation of driven shaft 51 is delivered to back axle 53 by speed reducing device 52 again.

As mentioned above, transmission wall 16b is from front and back that crankcase 16a rearward extends, the left cell case 16L of strip shape unit swing case 16 such as Fig. 3 and Fig. 7, ground shown in Figure 8, periphery wall 16c surrounds the left side around openings, the end face of periphery wall 16c becomes face of joint 16d, forms the outstanding bolt protruding base part 16e to foreign side at the some places of periphery wall 16c.

As shown in Figure 7, the crankcase 16a of left cell case 16L is formed with and holds the circular space 61 that starts free-wheel clutch 41.This circular space 61 is formed by sidewall 60 and circle wall thereof.Sidewall 60 is that center deployment is circular with the chimeric circular hole of the main bearing 37L of supporting crankshaft 36.Slightly tiltedly downside forms the circular depressions 63 of holding reducing gear 96 in its place ahead, is provided with bearing hole 63a at the central part of this circular depressions 63.

The part of this circular depressions 63 forms that general plan semicircular in shape forward bloats bloats recess 64, and the axle drive shaft 83 of Starting motor 80 is positioned at this and bloats recess 64.

Therefore, Starting motor 80 itself is arranged on and sees the position that overlaps with power cylinder 25 from the side as illustrated in fig. 5, and is topped by transmission-case cover 47 in the inboard of unit swing case 16.

Because Starting motor 80 is topped by transmission-case cover 47, so Starting motor 80 itself needn't be provided with water proof structure, water that splashes in the time of fully avoiding travelling or mud etc.

Starting motor 80 as illustrated in fig. 3, inner rotator 82 is the inside that the center can be rotated to support on cylinder-shaped coat 81 with axle drive shaft 83, the overcoat open side of stretching out at axle drive shaft 83, fixing motor carriage 85 integratedly, this motor carriage 85 is solid on left cell case 16L by bolt 86 spiral shells, and Starting motor 80 is installed in the unit swing case 16.

Axle drive shaft 83 on motor carriage 85 outwardly directed parts, form driving gear 83a.

In the bearing hole of bearing hole 63a that the two ends of reducing gear axle 95 embed left cell case 16L respectively and relative motor carriage 85, between two Embedded Divisions, reducing gear 96 by bearing carrier ring 97 rotatably mounted (see figure 3).

Reducing gear 96 is by gear wheel in large diameter 96a and small diameter gear 96b is coaxial constitutes integratedly.

Small diameter gear 96b and starting driven gear 42 engagements that are entrenched in the starting free-wheel clutch 41 on the bent axle 36, the driving gear 83a engagement of the axle drive shaft 83 of gear wheel in large diameter 96a and Starting motor 80.

Therefore, the power of Starting motor 80 is delivered to bent axle 36 by reducing gear 96, starting free-wheel clutch 41, makes combustion engine 20 startings.

As shown in Figure 8, the reducing gear axle 95 of reducing gear 96 embeds bearing hole 63a, this bearing hole 63a is arranged in the shoulder in left side (Fig. 8 is the right side) of the ventilation path 25d below of power cylinder 25, reducing gear 96 do not stretch out downwards near power cylinder 25 center configuration, so can make the entire internal combustion engine miniaturization.

Topped guard shield 101 on power cylinder 25, the right opening of guard shield 101 is connected (see figure 3) with the fan cover 102 of topped cooling fan 39, and the rotation suction air of the fan 39 that is cooled directs into power cylinder 25, makes power cylinder 25 coolings.

As Fig. 3 and shown in Figure 9, at the left side wall of guard shield 101, section is that the connection pipe 101a of rectangle stretches out to left, forms a pair of projection 101b, 101b up and down on the antetheca of this connection pipe 101a.

On connection pipe 101a, connecting hot air duct 103.

Hot air duct 103 is that section is long tube flattened rectangular, fore-and-aft direction as shown in Figure 10 and Figure 11, and its leading section forms than big slightly towards right-hand rectangular aperture frame 103a in the pipe, on its antetheca up and down pair of engaging sheet 104,104 to right-hand outstanding.On joint fastener 104,104, wearing aperture 104a, 104a.

Hot air duct 103 is from the crooked on one side oblique upper extension backward on one side of its leading section, form discharge orifice 103b in the rear end, left surface in the centre of this strip shape hot air duct 103, prominent establishing towards left to pin 105, fixing pin at the rear portion right flank and accepting parts 106.

It is rectangle small pieces that pin is accepted parts 106, forms the engaged groove 106a of openings at one side.

Protrude in the suspension carriage 17 above the crankcase 16a of unit swing case 16, top embeds the bearing rubber bush 17a that is supporting pivot 14b, and thereunder the predetermined position of sidewall forms circular hole 17b (seeing Fig. 7, Fig. 8).

Aspirate tube 27 stretches out from air suctiton inlet 16g, from this aspirate tube 27 with the carburettor 28 bonded assembly butt flange 27a of portion prominent establishing towards left to pin 107.

When hot air duct 103 is installed, the inboard (right side) that hangs carriage 17 along the left side is passed hot air duct 103 between pivot 14b and the crankcase 16a earlier, make the rectangular aperture frame 103a of front end consistent with the connection pipe 101a of guard shield 101, projection 101b with the antetheca of connection pipe 101a, 101b embeds pair of engaging sheet 104 up and down, 104 aperture 104a, in the 104a, the pin 105 that is darted at hot air duct 103 left surfaces is embedded in the circular hole 17b of the sidewall that hangs carriage 17, the pin that the 27a of butt flange portion of aspirate tube 27 is based in hot air duct 103 rear portion right flanks is accepted in the engaged groove 106a of parts 106 again, (sees Fig. 5 and engage with pin 107, Fig. 6).

As mentioned above, make front end rectangular aperture frame 103a and the connection consistent of hot air duct 103 with the connection pipe 101a of guard shield 101, make the front end location by joint fastener 104,104 and engaging of projection 101b, 101b, chimeric by pin 105 and circular hole 17b, with location before and after the pars intermedia, by hanging carriage 17 pushing left surfaces, accept engaging of parts 106 and pin 17 by pin, the rear portion is fixed and pushed right flank, like this hot air duct 103 is installed on the unit swing case 16 effectively.

In the present embodiment, screw etc. is not adopted in the installation of hot air duct 103, can improve operating efficiency, can certainly use screw etc.

After hot air duct 103 has installed, imported this hot air duct 103, discharge, blow to the relative carburettor 28 that is disposing with discharge orifice 103b from rear end discharge orifice 103b by power cylinder 25 warmed-up air.

By blowing hot-air, in the running of combustion engine 20 because of the carburettor 28 of the heat of gasification cooling temperature more than remaining on to a certain degree, can keep gasification performance, and can prevent to freeze at cold district.

As shown in Figure 5, left side at power cylinder 25, at power cylinder line of centers C-C downside, disposing and seeing the Starting motor 80 that overlaps with power cylinder 25 from the side, utilize the space of the power cylinder line of centers C-C upside of its top, setting hot air duct 103, can guarantee to blow to the hot blast path of carburettor 28 and can make swing unit 15 miniaturizations.

The right side of power cylinder 25 is provided with the fan cover 102 of formation to the path of power cylinder 25 air-supplies, sees from the side in the idle space that overlaps with opposition side (left side) power cylinder 25 setting Starting motor 80.So the layout degree of freedom of the mechanism relevant with the combustion engine key property is big, and Starting motor 80 does not stretch out in the below of swing unit 15, effectively utilizes the space, can make swing unit 15 miniaturizations.

Power cylinder 25 leans forward horizontal until being bordering on, and between back vehicle frame 5c, 5c, so, guaranteed the space of vehicle seat 6 belows to increase the volume of accommodating case 7, shorten wheelbase.

In addition, utilize the air suctiton inlet 16g above the crankcase 16a and the power cylinder 25 that leans forward between the space, carriage 17 is hung in configuration highlightedly upward, so, the compact conformation of combustion engine 20, and since with the relation of back vehicle frame 5c, improve the degree of freedom of linkage component 14.

Do not stretch out owing to hang carriage 17, so also guarantee minimum terrain clearance towards the below.

In the foregoing description, be that the power of Starting motor 80 is passed to bent axle 36 by reducing gear 96, starting free-wheel clutch 41, combustion engine 20 is started.Below, the example of another drive transmission mechanism is described with reference to Figure 12.

Starting motor 110 is identical with above-mentioned Starting motor 80 cardinal principles, is positioned at and sees the position that overlaps with power cylinder 121 from the side, is fixed on the unit swing case 120 by bolt 112 from passing on left motor carriage 111.

With above-mentioned configuration reducing gear 96 similarly, the shoulder below the ventilation path 121d of power cylinder 121 is disposing Starting motor gear 115.

Starting motor gear 115, an end of its pinion shaft is supported in the bearing hole of motor carriage 111 with embedding, and the other end is supported on the unit with embedding and swings in the bearing hole 120a of the shoulder below the ventilation path 121d of case 120.

Driving gear 110a engagement on the input side gear 116 of this Starting motor gear 115 and the axle drive shaft that is formed on Starting motor 110, its outgoing side gear 117 is axially jumped out in driven in rotation.

With these outgoing side gear 117 position engaged of jumping out rotation, driven gear 118 is rabbeted integratedly on bent axle 122.

Therefore, the time beyond engine starting, driven gear 118 does not mesh with outgoing side gear 117, when starting, when Starting motor 110 drove, the outgoing side gear 117 of Starting motor gear 115 was jumped out and is meshed with driven gear 118, made bent axle 122 rotations and began starting.

In the present embodiment, do not need starting free-wheel clutch 41 in the foregoing description etc.

Though Starting motor gear 115 is bigger than above-mentioned reducing gear 96, but owing to be positioned at the shoulder of the ventilation path 121d below of power cylinder 121, so, can be near the line of centers C-C configuration of power cylinder 121, therefore, can avoid making Starting motor 110 to stretch out the side left, can keep the miniaturization of swing unit.

Claims (5)

1. the mounting structure of starting motor of a unit oscillating internal combustion engine, in the motor bike that has the unit oscillating internal combustion engine that has the belt power drive and be supported swingably with respect to vehicle body, power cylinder stretches out from the crankcase of swing case front portion, unit with leaning forward; Side at crankcase has cooling fan, is provided with from the path of this cooling fan to the power cylinder air-supply at the homonymy of power cylinder; It is characterized in that, with the air-supply path opposition side side of power cylinder, seeing that from the side the position configuration that overlaps with this power cylinder Starting motor; Power cylinder with pair of right and left that front fork tube links to each other after between the vehicle frame.

2. the mounting structure of starting motor of unit oscillating internal combustion engine as claimed in claim 1 is characterized in that, above-mentioned Starting motor is provided in the unit swing case.

3. the mounting structure of starting motor of unit oscillating internal combustion engine as claimed in claim 1 is characterized in that, above-mentioned combustion engine has air suctiton inlet on the crankcase of crankshaft cheek periphery;

Engine lifting bracket is located between air suctiton inlet and the power cylinder.

4. the mounting structure of starting motor of unit oscillating internal combustion engine as claimed in claim 1 is characterized in that,

Above-mentioned Starting motor and bent axle between have reducing gear;

The shoulder of the ventilation path of the bearing portion of reduction gear on crankcase.

5. as the mounting structure of starting motor of each described unit oscillating internal combustion engine in the claim 1 to 3, it is characterized in that,

Above-mentioned Starting motor is configured in the power cylinder line of centers downside of power cylinder one side;

Power cylinder line of centers upside in the same side of power cylinder is provided with the hot blast path that leads to carburettor.

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