CN100528682C - Motorcycle - Google Patents

Abstract

Motorcycle (10) includes a power unit (18) mounted to the underside of a main frame (12) extending in a rearward and downward direction from a head pipe (11). Rear fork (47) is pivotably mounted to pivot plates (13, 14) provided on a rear portion of the main frame, and a rear wheel (46) is supported by the rear fork. Muffler (63) is positioned between the power unit and the rear wheel and mounted to a lower end portion of one of the pivot plates (13). Brake pedal (67) is provided beneath and remotely from one of the pivot plates (14) for braking the rear wheel and supported by the power unit (18) via a support shaft (101).

Description

Motor bike

Technical field

The present invention relates to motor bike, and more specifically, relate to the noise silencer that is attached to a power unit and the improved layout and the structure of the brake pedal that supported by this power unit.

Background technology

Noise silencer is arranged on an example of the motor bike of driving engine back can announce that No.2002-37174 knows from Japanese patent unexamined.

Disclosed exhaust gear comprises the downtake pipe that becomes S shape to extend backward basically from the bottom of the cylinder head that constitutes engine main body in this announcement, be connected to the downtake pipe rear end and go up the exhaust muffler that extends at the Width (being vehicle-width direction) of vehicle, and the second exhaust pipe that is connected to the exhaust muffler end.

An a pair of left side and right steps are fixed to the bottom of the crankcase of engine main body via a stretcher retainer, and a side stand is fixed to an end of stretcher retainer via bracket supports parts.

Downtake pipe be positioned near its to cylinder head and protruding on vehicle-width direction to the part of exhaust muffler connecting portion, and when birds-eye view is observed, be exposed to outside.In addition, exhaust muffler protruding on vehicle-width direction with second exhaust pipe bonded assembly end, and when birds-eye view is observed, be exposed to the outside.Therefore, for disclosed conventional exhaust device, still having further room for improvement aspect the outward appearance of freeing pipe.If exposed parts covers with certain cover plate more attractive in appearance, then need quite high extra cost.

In addition,, improves above-mentioned motor bike practicality if also will being provided with a main support except that side stand, then because downtake pipe and exhaust muffler are arranged near engine main body or the stretcher retainer, so will be difficult to main support is mounted to the rear portion of engine main body or is mounted to the stretcher retainer.And, do not wish main support is mounted to the bottom of stretcher retainer fwd crankcase, because the bottom of crankcase is near the front end of vehicle body, and main support is mounted to the bottom will causes weight lack of equilibrium on the vehicle body fore-and-aft direction.

Summary of the invention

The technical matters that the present invention solves provides a kind of motor bike, and it has improved outward appearance, and cost has been lowered.

According to the present invention, a kind of motor bike is provided, this motor bike comprises: the head pipe; From the beginning manage backward and the upwardly extending main car frame in downward side; Comprise a driving engine and be mounted to the power unit of main car frame downside; Be arranged on the pivot plate on the main car frame rear portion; Be mounted to the back vent of pivot plate pivotly; The trailing wheel that is supported by back vent; Be arranged between power unit and the trailing wheel and be mounted to the noise silencer of the end portion of pivot plate; And be arranged on the below of a pivot plate in the described pivot plate and away from the brake pedal of this pivot plate, this brake pedal is used for braking rear-wheel, and via a bolster by the power unit bearing.

Noise silencer is arranged between driving engine and the trailing wheel, can avoids noise silencer to be exposed to the outside basically, thereby can improve the outward appearance of motor bike significantly.

Preferably, support shaft supports main support and brake pedal.Therefore, can reduce the number of necessary parts and thereby reduce the cost of motor bike.

Preferably, power unit has the supporting convex portion (supporting bosses) that is arranged on the part of its rear end, and bolster passes the axle support holes that is formed in the supporting convex portion.By the supporting convex portion that is arranged on the power unit rear end part, brake pedal and main support can easily be mounted to described supporting convex portion.

Description of drawings

Fig. 1 is the lateral plan that has according to the motor bike of one embodiment of the invention;

Fig. 2 is a birds-eye view, with the ratio of amplifying power unit and the noise silencer of Fig. 1 and other parts around power unit and the noise silencer is shown;

Fig. 3 is a lateral plan, and Fuel Tank, pivot plate and the noise silencer of Fig. 1 is shown, and other parts around Fuel Tank, pivot plate and the noise silencer;

Fig. 4 is the back view of the amplification of motor bike, and a crankcase and this crankcase other parts on every side are shown specially;

Fig. 5 is the lateral plan that the noise silencer of Fig. 3 is shown with the ratio of amplifying;

Fig. 6 is the birds-eye view of noise silencer;

Fig. 7 is the cross sectional drawing that cuts along straight line 7-7 in Fig. 5; And

Fig. 8 is the backplan of the noise silencer of Fig. 5.

The specific embodiment

Fig. 1 is the lateral plan of the motor bike (being autoped) according to one embodiment of the invention.Motor bike 10 is a kind of vehicles, wherein as shown in Fig. 1, the power unit 18 that comprises driving engine 16 and change-speed box 17 is by a single main car frame 12 and an a pair of left side and Thuban axillare 13 and 14 (pivot plate 13 in them only is shown among the figure) supporting, described single main car frame 12 along from a pipe 11 backward and downward direction extend, a described left side and Thuban axillare 13 and 14 are mounted to the rear end part of main car frame 12 and extend downwards from main car frame 12 rear end parts.Fuel Tank 23 is mounted to from the rear portion of main car frame backward and the upwardly extending a pair of left side, side and the right back vehicle frame 21 and 22 (vehicle frame 21 after in them only is shown the figure) that make progress, on Fuel Tank 23 and back vehicle frame 21 and 22, a storage bin 24 is installed, and a vertical arrange seats 26 is installed on storage bin 24, be used for respect to storage bin 24 pivoting actions, to close and to open storage bin 24.

Can be fixed with front fork 31 on the head pipe 11 with turning to, be supported with front-wheel 28 in the office, bottom of front fork 31, and one vertical handgrip 32 is arranged at the upper part of head pipe 11 upper support.

Pivot plate 13 and 14 and the back be connected with an a pair of left side and right subframe 34 (in them only is shown in the drawings) between the vehicle frame 21 and 22, and a pair of left side and the right back seat leg pedal 36 and 37 (their a back seat stretcher 36 only is shown in the drawings) that are used for rear rider are bearing in a pair of stretcher bearing support 41 and 42.

Above-mentioned head pipe 11, main car frame 12, pivot plate 13 and 14, back vehicle frame 21 and 22 and subframe 34 is common constitutes body structures 45.

The rocking arm of supporting wheels 46 (back vent just) 47 is connected to each pivot plate 13,14 pivotly in its back-end.

Driving engine 16 is included in the cylinder section 50 of essentially horizontally extending of its front portion, and the cylinder head 51 of cylinder section 50 is connected with an air inlet system 52 and an exhaust gear 53.

Air inlet system 52 comprises that the throttle body 57 that 55, one of the airfilters of the front portion that is mounted to main car frame 12 are equipped with eductor is connected to airfilter 55 at one end, and is connected to cylinder head 51 at other end place via an air inlet pipe 56.

Catalytic convertor 62 in the centre portion that exhaust gear 53 comprises the freeing pipe 61 that is connected to cylinder head 51 at one end, be arranged on freeing pipe 61 and be connected to the noise silencer 63 of the rear end part of freeing pipe 61.Noise silencer 63 is positioned at the back of power unit 18.

Catalytic convertor 62 is arranged in space 64 of fwd of the below that is formed on cylinder section 50 and following crankcase 65.

Power unit 18 comprises crankcase 65, and is fixed to the bottom of crankcase 65 and laterally stretches out from crankcase 65 for the main pedal 66 (main pedal only is shown in the drawings) that chaufeur uses.In addition, the posterior end part of crankcase 65 is fixed with trailing wheel brake pedal 67 and main support 68 pivotly.

Reference numeral 71 indication one handle cover plates, Reference numeral 72 indications one front shroud, Reference numeral 73 indications are arranged on head pipe 11 fwd storage batterys, Reference numeral 73a indication is fixed to the storage battery frame support bracket that head pipe 11 front portions are used to support storage battery 73, the front fender apron at the top and the rear portion of front-wheel 28 is covered in Reference numeral 74 indications, and Reference numeral 76 indication leg guards (being the vehicle body cover plate).And, Reference numeral 77 indications have the filling lid of locked plug-in unit, this filling lid is arranged on leg guard or the vehicle body cover plate 76, is used for opening and closing when passing through the filler opening 23e (see figure 3) fueling of Fuel Tank 23, and Reference numeral 78 indications are used to close the lid of filler opening 23e.In addition, Reference numeral 81 indications are fixed to the engine hanger of main car frame 12, Reference numeral 82 indications are installed in the drum brake system on the hind axle 83, Reference numeral 84 indications are connected the brake facing (not shown) of drum brake system 82 and the torsion bar between the Rocker arm 47, be used to prevent that drum brake system 82 from rotating, and Reference numeral 86 indications are arranged on the rear shock absorber unit between in the rear shock absorber carriage 47a that is fixed to Rocker arm 47 and the back vehicle frame 21 one.And Reference numeral 87 indications are mounted to the mudwing at the following rear portion of storage bin 24, and Reference numeral 88 indications cover the back protective case on the top of trailing wheel 46, Reference numeral 91 indications one handrail, and Reference numeral 92 indications one taillight.

Fig. 2 is a birds-eye view that amplifies, and power unit and the noise silencer of Fig. 1 is shown, and other parts around the power unit.Freeing pipe 61 downwards and then extends back along the lower surface of power unit 18 from the cylinder head 51 of driving engine 16.Be connected to the rear end of freeing pipe 61 near the rear end part of the crankcase 65 of noise silencer 63 power units 18.Crankcase 65 has an a pair of left side and the right support supporting convex 65S of portion that integrally forms with the box back of crankcase 65 part, and is formed with spool a support holes 65a and a 65b respectively in a left side and right support supporting convex portion 655.Bolster 101 passes spool a support holes 65a and a 65b, and brake pedal 67 and main support 68 are bearing on the bolster 101 pivotly.Arrow " FRONT " indication is towards the direction in the place ahead of motor bike 10 in the figure.

Freeing pipe 61 extends on the fore-and-aft direction at vehicle below the power unit 18 substantially as the crow flies.Catalytic convertor 62 extends upward in the vehicle front and back, and when observing in birds-eye view, overlapping with the cylinder section 50 of driving engine 16 basically, catalytic convertor 62 is positioned at the left side of crankcase 65 and the front of right projection 65c and 65d.

Noise silencer 63 is L shaped noise silencers, and this noise silencer has a broad leading portion 63a and the back segment 63b of an extend longitudinally, and the right lateral surface of this back segment from broad leading portion 63a along trailing wheel 46 extends back.

Broad leading portion 63a has one the left mounting portion 63c (see figure 1) that is attached in the pivot plate 13, and the back segment 63b of longitudinal extension has one the right mounting portion 63d that is attached in the stretcher bearing support 42.

Torsion bar 84 is connected to a crossbeam 105 at its front end place, and this crossbeam connects a left side and right arm part 103 and 104 of Rocker arm 47.

Reference numeral 111 indications are fixed to leg guard 76 installation bracket of cylinder section 50, Reference numeral 112 indications are arranged on the gear shift pedal on the change-speed box 17, Reference numeral 113 indication one side stand, Reference numeral 114 indications are connected to the pivot plate 13 that is used for support arm 47 and the pivot of 14 (see figure 1)s.Moreover Reference numeral 116 indications are used for the kickpedal of fire an engine, and Reference numeral 117 indications are attached to the foot-operated plate stem that crankcase 65 is used to interconnect a left side and right main pedal 66.

Above-mentioned pivot 114 supporting left sides and right steps bearing support 41 and 42 and Rocker arm 47.

Fig. 3 is a lateral plan, and the Fuel Tank of Fig. 1, other parts around other parts, pivot plate and the noise silencer around the Fuel Tank are shown.As shown in the figure, Fuel Tank 23 is connected to Fuel Tank installation bracket 121 and 122 at its flange portion 23a place by bolt 123 and nut 124, and these installation brackets are fixed to a left side and right back vehicle frame 21 and 22 then; Nut 124 is fixed to the downside of Fuel Tank installation bracket 121 and 122.Reference numeral 125 indications are arranged in the Fuel Tank 23 and are fixed to the petrolift of the upper wall of Fuel Tank 23.

Fuel Tank installation bracket 121 and 122 is mounted to back vehicle frame 21 and 22 regularly and is positioned at the v-shaped bending part 21b and the 22b fwd part of vehicle frame, and is mounted to the part that back vehicle frame 21 and 22 is positioned at sweep 21b and 22b back.Because Fuel Tank 23 is fixed to back vehicle frame part in the front and back of sweep 21b and 22b, so Fuel Tank 23 can act on the reinforcing member of back vehicle frame 21 and 22 week, and increases the rigidity of back vehicle frame 21 and 22 thus.In addition, because Fuel Tank 23 is connected between a left side and right back vehicle frame 21 and 22, so it can be used as the crossbeam of body structure 45, greatly helps to increase the overall stiffness of body structure 45 thus.

Main car frame 12 has a rear end part 12a, and this rear end part has the upper surface to lower recess.Therefore, rear end part 12a has the height H 2 less than the height H 1 of the front portion of main car frame 12, thereby makes Fuel Tank 23 make its downside 23f be positioned at lower height.Therefore, Fuel Tank 23 can have the size and thereby the total volume that increases of increase.

Storage bin 24 has an a pair of left side and right front downward bossing 24a (a forward direction lower convexity part 24a in them only is shown among the figure) in its end section, and an a pair of left side and right back downward bossing 24b (only illustrate in the drawings in them after bossing 24b) downwards.Forward direction lower convexity part 24a is fixed to an a pair of left side and right storage bin installation bracket 126 (a storage bin installation bracket 126 in them only is shown among the figure) via bolt 128 and nut member 131, described storage bin installation bracket is fixed to the upper surface of Fuel Tank 23, and back bossing 24b downwards is fixed to an a pair of left side and right storage bin installation bracket 127 via bolt 128 and nut member 131, and described storage bin installation bracket is fixed to back vehicle frame 21,22.

Each nut member 131 is to have the cylinder part that flange and its inside face have screw thread at the one end, and nut member passes the patchhole that is formed in storage bin installation bracket 126 or 127 from the below, and by being welded and fixed to storage bin installation bracket 126 or 127.

Storage bin 24 by being formed on storage bin 24 forward direction lower convexity part 24a and the back downwards first in the bossing 24b cooperate through hole in the upraised portion upper fixed of storage bin installation bracket 126 and 127 to storage bin carriage 126 and 127, suitably locate storage bin 24 with respect to installation bracket 126 and 127 thus, and in storage bin 24, bolt 128 is screwed to the negative thread of cooresponding nut member 131 then.

Noise silencer 63 comprises that one is connected to second part 135 of noise silencer and first part 136 of a noise silencer of freeing pipe 61, and these two second parts of noise silencer engage the formation container shapes each other vertically with first part 135 and 136 (along their lateral edges).

When observing from the side, second part 135 of noise silencer has lower convexity part 135a, and this bossing 135a is shaped as that its downside is positioned to the main support 68 of raised position is overlapping.

Has respectively nut (not shown) on installation bracket 137 that the end surface of along noise silencer lower and upper half part 135 and 136 extends and a side surface that is installed in installation bracket 137 at the left mounting portion 63c that noise silencer 63 is attached to pivot plate 13 places.Left side mounting portion 63c is attached to pivot plate 13 by bolt 138, and this bolt 138 passes the bolt-inserting hole (not shown) in the end portion that is formed on pivot plate 13 and is screwed into the in the above-mentioned unshowned nut.

The right mounting portion 63d that is attached to (stretcher bearing support 41 back in Fig. 3) stretcher bearing support 42 places at noise silencer 63 has the cylinder part 142 on installation bracket 141 that is fixed to first part 136 of noise silencer and the top that is installed in installation bracket 141.Right mounting portion 63d is attached to stretcher bearing support 42 by cylinder part 142, and this cylinder part 142 is fixed to installation bracket 144 by bolt 146 and nut 147.

Stretcher bearing support 41 and 42 is fixed to pivot plate 13 and 14 (pivot plate 13 in them only is shown among the figure) at place, its underpart with one heart by bolt 151 and Rocker arm 47, and locate at an upper portion thereof to be fixed to installation bracket 152 (in the described installation bracket only is shown among the figure) by bolt 153, this installation bracket is fixed to back vehicle frame 21,22.

Fig. 4 is the back view of the amplification of motor bike, and crankcase and crankcase other parts on every side are shown specially.More specifically, Fig. 4 illustrates main support 68 and brake pedal 67, and this brake pedal is fixed to the bracket supports lug boss 65S on the rear end part that is arranged on power unit 18 via bolster 101.In an illustrated embodiment, main support 68 is in ground connection (ground-engaging) position of working, Reference numeral 155 indication ground.

Main support 68 comprises the plate member 165 and 166 that supports pivotly via bolster 101, is fixed to the arm member 167 and 168 and be connected between arm member 167 and 168 and be fixed to the crossbeam 171 of arm member 167 and 168 of two pipe forms of plate member 165 and 166 respectively.Main support 68 comprises that also one crosses out parts 172 and a reinforcing member 173, it is laterally protruding that this crosses out one the end portion of parts from arm member 167, thereby allow motorcycle driver with a his or her pin pivot main car frame 68, described reinforcing member 173 is connected between the proximal part that crosses out parts 172 and the arm member 167 and is fixed to proximal part and the arm member 167 that crosses out parts 172.Reference numeral 175 indications are arranged on a pin on the plate member 165.Extension coil spring 178 is connected between pin 175 and the pin 177, rise or out-of-action stowed position thereby main support 68 can be switched to from the earthing position that works by the pulling force of coil spring 178, described pin 177 is arranged on the carriage 176 that is fixed to crankcase 65.

The far-end that brake pedal 67 comprises the cylinder part 181 that is installed in rotation on the bolster 101, the arm member 182 that is connected to cylinder part 181, be arranged on arm member 182 is placed the pedal part 183 and the forearm parts 184 of another pin for chaufeur, these forearm parts 184 are fixed to cylinder part 181, so that may be operably coupled to drum brake system 82 (see figure 1)s that are used for trailing wheel.

Bolster 101 comprises the panhead part 101a that is arranged on the one end, and extends through cylinder part 181, pad 185, plate member 166, axle support holes 65b and the 65a and the plate member 165 of brake pedal 67 in the following order successively.Being provided with spring cotter 186 skids off from preposition to prevent bolster 101.

Freeing pipe 61 is arranged in the space 188 that support shaft 101, arm member 167,168 and crossbeam 171 center on, and is positioned at plate member 165 and 166 inside zones (promptly along the inside face of plate member 165 and 166 and between the inside face of plate member 165 and 166) extending through on the fore-and-aft direction.In other words, when main support 68 remains on the earthing position that works, the zone of freeing pipe 61 between the inside face that extends through a left side and right arm parts 167 and 168 on the fore-and-aft direction.

Fig. 5 is a lateral plan, with the ratio of amplifying the noise silencer 63 of Fig. 3 is shown, and for clarity, first part 136 of noise silencer is removed.

The rear end part 61a of freeing pipe 61 is received in the wide front section 63a of noise silencer 63, one first disconnector 195 and have isolated second disconnector 196 to be mounted to the back segment 63b of longitudinal extension backward from first disconnector 195, and two first extend through first and second disconnectors 195 and 196 communicating pipe 197.In addition, two length extends through second disconnector 196 less than second communicating pipe 198 and the tail pipe 201 of first communicating pipe 197, and tail pipe 201 has a rear end part, and this rear end part extends through the rear wall 63f of the back segment 63b of longitudinal extension.

Fig. 6 is a birds-eye view, and the noise silencer 63 of Fig. 3 is shown, and first part 136 of noise silencer is removed.

As seen from Figure 6, the inside of noise silencer 63 is separated by first and second disconnectors 195 and 196, all is first, second and the 3rd chamber 211,212 and 213 of expansion chamber so that each to be provided.The rear end section 61a of freeing pipe 61 is arranged in first chamber 211.

The rear end section 61a of freeing pipe 61 comprises: extend to the noise silencer 63 from the outside of noise silencer 63 and basically with the pipe shaft end 61c of right-angled bend; Extension pipe 61e, this extension pipe 61e are connected to pipe shaft end 61c via a joint pipe 61d and bend to respect to pipe shaft end 61c with about 180 ° of extensions; And end pipe 61f, this end pipe 61f is connected to the far-end of extension pipe 61e, and has a plurality of deflation holes.Extension pipe 61e is set at carriage 215 supportings on second part 135 of noise silencer.

The first and the 3rd chamber 211 and 213 is communicated with chamber 197 via first and communicates with each other, and the second and the 3rd chamber 212 and 213 is communicated with chamber 198 via second and communicates with each other, and second chamber 212 is communicated with the outside via tail pipe 201.

The exhaust that flows to first chamber 211 by freeing pipe 61 from driving engine is communicated with chamber 197 by first and flows to the 3rd chamber 213, and is communicated with chamber 198 from the 3rd chamber by second and continues to flow to second chamber 212.By this way, can suitably realize exhaust expansion and noise elimination, and exhaust is discharged to the outside via tail pipe 201 at last.

Fig. 7 is the cross sectional drawing that the straight line 7-7 along Fig. 5 cuts, and illustrates first specially and is communicated with the arrangement that chamber 197 and second is communicated with chamber 198 and is arranged on the tail pipe 201 between them.As shown in Figure, first a maximum height place that is positioned at whole chambers 197 and 198 that is communicated with in the chamber 197.

As finding in from Fig. 5, the open rearward end 61h of the extension pipe 61e of freeing pipe 61 (promptly, the open end of freeing pipe 61) is positioned at (more specifically through the open rearward end 201a of tail pipe 201, the top of the horizon 220 upper extreme point 201b through open rearward end 201a), and described that is communicated with the top that chamber 197 also is positioned at horizon 220.Therefore, first is communicated with the preceding and after-opening 197a of chamber 197 and the top that 197b is positioned at horizon 220.

For example, even when the opening 201a of water by tail pipe 201 enters noise silencer 63, can prevent effectively that also sealing enters freeing pipe 61 part adjacent with driving engine by extension pipe 61e, because the open rearward end 61h of extension pipe 61e is positioned at the top of horizon 220.Moreover, because first be communicated with the top that chamber 197 also is positioned at horizon 220, therefore can avoid at in-engine resistance of exhaust owing to air layer increases, thereby the difficulty that runs into can avoid engine breakdown during the engine operation and fire an engine the time.

Fig. 8 is the backplan of the noise silencer of Fig. 5, clearance groove part 135d in the downside 135c that is formed on second part 135 of noise silencer is shown specially, and this clearance groove partly is used to prevent the interference between the arm member 168 of the downside 135c of second part 135 of noise silencer when main support is raised up to out-of-action punctured position and main support 68.By the clearance groove 135d of setting like this, can increase the height of main support 68 built on stilts greatly, guarantee the volume that noise silencer 63 is enough simultaneously.

In addition, by the arm member 168 that is positioned at 63 times side-lowers of noise silencer, be placed to noise silencer with the arm member of main support and become the situation of the side by side relationship of approximate horizontal to compare, present embodiment of the present invention can reduce noise silencer 63 or the overhang of main support 68 on vehicle-width direction, as its result, can reduce the overall dimensions of vehicle and improve the outward appearance of vehicle.

Though described noise silencer 63 is carriage 144 supportings that are set at stretcher bearing support 42 upper support pivot plates 13 and back seat stretcher 37, it also can be supported a left side and the right steps bearing support 41 and 42 supportings of a left side and right back seat leg pedal 36 and 37.

In addition, though the 68 launched machine supportings of described main support, it also can be supported by pivot plate; In this case, freeing pipe 61 is set to extend through the inside zone of plate member (upper support part) 165 and 166 that is positioned at main support 68.

Industrial usability

When being applied to comprise the motorcycle of silencer and brake pedal, the present invention is particularly useful.

Claims (5)

1. motor bike, described motor bike comprises:

The head pipe;

Manage backward and the upwardly extending main car frame in downward side from described head;

Be mounted to the power unit of the downside of described main car frame;

Be arranged on the pivot plate on the described main car frame rear portion;

Be mounted to the back vent of described pivot plate pivotly;

The trailing wheel that is supported by described back vent;

Be arranged on the noise silencer between described power unit and the described trailing wheel, described noise silencer is mounted to one end portion in the described pivot plate;

It is characterized in that described motor bike also comprises: be arranged on the below of a pivot plate in the described pivot plate and away from the brake pedal of this pivot plate, described brake pedal is used to brake described trailing wheel, and is supported by described power unit via a bolster.

2. according to the described motor bike of claim 1, it is characterized in that the described brake pedal of described support shaft supports and a main support.

3. according to the described motor bike of claim 1, it is characterized in that described power unit has the supporting convex portion that is arranged on the part of its rear end, and described bolster passes the axle support holes that is formed in the described supporting convex portion.

4. according to the described motor bike of claim 2, it is characterized in that, described power unit comprises a freeing pipe, described freeing pipe is mounted to and extends through a space, when described main support was in the earthing position that works, described space was centered on by the left side of described bolster, described main support and right arm parts and the crossbeam that is connected the described main support between the described arm member.

5. according to the described motor bike of claim 2, it is characterized in that, described noise silencer has the clearance groove part that is formed on its downside, and described clearance groove partly is used for avoiding the interference between the left side of the described downside of described noise silencer when described main support is elevated to out-of-action punctured position and described main support and right arm parts one.

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