CN1772558A - Swing arm structure in motorcycle - Google Patents

Abstract

A structure for supporting a swing arm in a motorcycle is provided in which a power unit swingably supports a front portion of the swing arm via a first pivot of a cylindrical shape that is coaxial with an output shaft of the power unit and a second pivot that is coaxial with the first pivot. The number of parts used are reduced and the removal and installation of the swing arm is facilitated. An output shaft, an outer end portion of which projects outwardly of a swing arm, is connected to a final transmission member of a reduction transmission and is capable of removal or insertion in an axial direction, while being incapable of relative rotation about an axis. A first pivot is removably mounted on a power unit. A second pivot is removably secured to the power unit PA or the swing arm.

Description

Rocker structure in the motor bike

Technical field

The present invention relates to a kind of structure that is used to support the motor bike rocking arm, wherein be installed in the front portion that power unit on the body shell supports rocking arm swingably, its rear portion by with coaxial cylindricality first pivot of the output shaft support trailing wheel that pivots.In addition, second pivot is coaxial with first pivot.Power unit comprises driving engine and deceleration gear arrangement, and this deceleration gear arrangement comprises the output shaft that is used for providing to trailing wheel propulsive effort.The output that this deceleration gear arrangement is used for transmitting by deceleration driving engine is set.

The invention still further relates to a kind of structure that is used for supporting the rocking arm of motor bike, this structure comprises a pair of left and right sides support arm portion of extending forward, this left and right sides support arm portion is arranged in the front portion of this rocking arm, be used for pivoting and support the trailing wheel at rear portion, this is supported on the rocking arm support component that is arranged in therebetween by shaft element swingably to support arm portion.

Background technology

Become known for supporting the structure of rocking arm.For example, as open the disclosed structure of No.Hei11-342754 the Japanese Patent spy.This structure is arranged to have the front portion of rocking arm, and this rocking arm is the left and right sides of power unit is supported on pair of pivot with the output shaft coaxial arrangement of power unit swingably by this power unit on.

Yet, open the disclosed structure that is used for supporting rocking arm of No.Hei 11-342754 the Japanese Patent spy, this output shaft is on the such housing of state lower support at power unit, and promptly the axial motion of this output shaft is restricted under the state that the power unit assembling finishes.Under this state, first pivot that output shaft is passed betwixt coaxially removably is fastened on the power unit, and is fastened on second pivot on the rocking arm front portion can be assemblied on the power unit about the mode of a rotational and by its support.More specifically, unclamp the fixing of first pivot and power unit, then by unclamping fixing on rocking arm from rocking arm and power unit dismounting second pivot.Even do like this, also rocking arm can not be installed on the power unit in a structure or and dismantle rocking arm from this power unit, this structure has the rocking arm with its one.Therefore, in order to allow Assembly ﹠Disassembly, rocking arm is divided into right-hand part and left side.This causes employed number of components to increase.This structure also makes rocking arm to be installed on power unit or to be dismantled rocking arm from power unit and bothers very much.

Known for example opening the Japanese Patent spy discloses a kind of structure that is used for supporting the rocking arm of motor bike among the No.2004-122864.This structure comprises a pair of support arm portion that is arranged in the anterior place of rocking arm.This is supported on swingably to support section on the shaft element that is arranged between power unit and the body shell, and this power unit is arranged in this between the support arm portion, and body shell is arranged in this outside to support arm portion.

Open in the disclosed rocker supporting structure of No.2004-122864 the Japanese Patent spy, shaft element is supported by power unit, and body shell is arranged in the outside of rocking arm.This structure has been guaranteed the rigidity of shaft element, and this provides good performance for rocking arm when the operation motor bike.Yet this supporting construction needs body shell to be arranged in the outside of rocking arm.Yet, need guarantee certain Design freedom by the outside that body shell is not arranged in rocking arm.In this case, also expectation obtains and the rigidity of opening disclosed supporting construction par among the No.2004-122864 the Japanese Patent spy.

Summary of the invention

In view of the above, the purpose of the embodiment of the invention is to provide a kind of structure that is used for supporting the rocking arm of motor bike, wherein, condition precedent as necessity, by eliminating the necessity of between power unit and body shell, arranging rocker structure, and can obtain the enough rigidity of shaft element, and obtaining certain Design freedom simultaneously, described power unit and body shell can be positioned over the rocking arm inboard or the outside respectively.

The purpose of the embodiment of the invention is to provide a kind of structure that is used for supporting the rocking arm of motor bike, and this structure allows rocking arm to be supported on the power unit, reduces used unit quantity simultaneously and is convenient to carry out rocking arm with respect to the dismounting of power unit and installation process again.

To achieve these goals, embodiments of the invention provide a kind of structure that is used for supporting the rocking arm of motor bike, wherein, be installed in the front portion that power unit on the body shell supports rocking arm swingably, its rear portion by with coaxial cylindricality first pivot of output shaft and with coaxial second pivot of first pivot support trailing wheel that pivots.This power unit comprises driving engine and deceleration gear arrangement, and this deceleration gear arrangement comprises the output shaft that is used for providing to trailing wheel propulsive effort.The output that the deceleration gear arrangement is used for transmitting by deceleration driving engine is set.Described structure comprises output shaft, and this output shaft has from the outwardly directed outer end portion of rocking arm, this rocking arm with can along axis direction remove or insert and can not about axis in relative rotation mode link to each other with the final stage transfer element of deceleration change-speed box.First pivot is removably mounted on the power unit, and second pivot removably is fastened on power unit or the rocking arm.

In an embodiment of the present invention, described second pivot is can fixedly removably being fastened on power unit or the rocking arm to the mode of throwing off from the power unit shaft under the releasing orientation.

In an embodiment of the present invention, described rocking arm is integrally moulded.

In an embodiment of the present invention, the output axle bed that is used for supporting rotationally the outer end portion of output shaft is removably mounted on the front portion of rocking arm, thereby covers the outer end portion of this output shaft.

In an embodiment of the present invention, the pivotal block of outer end portion that can keep passing second pivot of rocking arm regularly is screwed in the power unit, and be removably mounted on a plurality of bossings, the part place of this bossing outside the oscillating motion scope of rocking arm is arranged in the power unit.

According to embodiments of the invention, the output shaft of described power unit is being connected on the final stage transfer element of deceleration gear arrangement along its mode of axially removing or inserting.Therefore this output shaft can axially be dismantled or be inserted into this power unit from power unit.In addition, first pivot is removably mounted on the power unit, and second pivot removably is fastened on power unit or the rocking arm.In order to remove rocking arm, carry out following step from power unit.More specifically, carry out in order: pull down output shaft from power unit, unclamp the fixing of the relative power unit of first pivot, and pull down second pivot from power unit.Just can dismantle rocking arm then from power unit.Therefore, in order once more rocking arm to be installed in the power unit, only need to put upside down the dismounting order.This helps simplify to remove and installation steps once more.This structure has also been eliminated separately necessity of rocking arm, has therefore reduced the quantity of used unit.

According to embodiments of the invention, with respect to power unit dismounting or installation rocking arm the time, can pull down second pivot, thereby prevent that second pivot from hindering dismounting or installation process from power unit.This has improved the operability of dismounting and installation process.

According to embodiments of the invention, described rocking arm is integrally moulded.This has not only reduced the quantity of used unit, and has improved the assembly precision of rocking arm with respect to power unit.This structure is also by having eliminated necessity to the fastening structure that is used to assemble rocking arm with bolt etc. in conjunction with a plurality of different parts.This helps to improve the rigidity of rocking arm self, and has reduced the weight of unspringing weight.

According to embodiments of the invention, usefulness acts on the supporting member of output shaft and the described output axle bed of cladding element is removably mounted on the front portion of rocking arm.This has improved outward appearance and provides more effective support for output shaft.

According to embodiments of the invention, can realize the dual-support structure of second pivot on power unit, and it is minimum to be used in second pivot that prevents to be screwed in the power unit used number of components that gets loose.This has not only improved the support stiffness of second pivot on power unit, and has further stablized the oscillating motion that is used for rocking arm and supported.

In order to realize the purpose of the embodiment of the invention, a kind of structure that is used for supporting the rocking arm of motor bike is provided, and wherein, described structure comprises a pair of left and right sides support arm portion of extending forward, this is arranged in the front portion of rocking arm to support arm portion, is used for pivoting supporting the trailing wheel at rear portion.This is supported on swingably by a shaft element support arm portion and is arranged on therebetween the rocking arm support component, wherein, this shaft element passes at least this support arm portion one of them outer end portion in left and right sides is supported by a holding element, and this holding element is removably mounted on the rocking arm support component.

In an embodiment of the present invention, thus described rocking arm support component comprise and be installed on the body shell power unit that drives trailing wheel.

In an embodiment of the present invention, described axle holding element roughly forms annular, thereby makes the outer end portion of shaft element pass betwixt, and comprises a retaining part, and this part peripheral position place therein has slit.Shaft element will be by crossing the slit and being screwed into the bolted in the retaining part and being kept in position by this holding element.

In an embodiment of the present invention, described rocking arm support component comprises a plurality of removably bossings of installation shaft holding element that are used for.This bossing is arranged on the position in the oscillating motion scope outside that falls into rocking arm, and described bossing is overlapping with rocking arm in its top view.

In embodiments of the present invention, be arranged in the rocking arm support component to the described a plurality of bossings of small part, thus protruding from rocking arm.

In an embodiment of the present invention, at least one in a pair of bossing comprises a plurality of fastening seats that are used for the fastener shaft holding element, and this is arranged in the rocking arm support component in the position from the above and below clamping rocking arm of rocking arm bossing.Position of each fastening seat all forms like this, that is, from the center of shaft element to distance of each fastening seat less than with the distance of the fastening seat of location forwardly.

According to embodiments of the invention, pass this outer end portion and keep by the axle holding element that is removably mounted on the rocking arm support component to the shaft element of at least one in the support arm portion of the left and right sides.The rigidity of shaft element can improve by simple structure, and this shaft element is supported by rocking arm support component and axle holding element in this structure.Rigidity that also can the adjusting shaft holding element, thus allow the rigidity of shaft element is adjusted to the exact value of setting up according to suitable vehicle.In addition, the structure of simplification makes that the increase of weight and cost is relatively low, and makes and the rocking arm support component can be arranged on the rocking arm inside.Therefore, can improve the degree of freedom of body drawing.

According to embodiments of the invention, eliminated in the necessity of arranging body shell near the some place of the oscillating motion support section of rocking arm.Therefore, can utilize the rigidity of power unit and obtain stable oscillating motion by rocking arm.

According to embodiments of the invention, by axle holding element simple in structure the outer end of shaft element is kept in position reliably, thereby improve the rigidity of shaft element.In addition, be easy to carry out the maintenance and the releasing maintenance operation of shaft element.

According to embodiments of the invention, described shaft element can be securely held on suitable position, and the oscillating motion that is used for rocking arm stroke is provided simultaneously.Also tectonic axis holding element more compactly.All these helps cost-cutting.

According to embodiments of the invention, can constitute a holding element compactly by projection and the recess minimum that makes a holding element.Therefore, this holding element also can be made by for example press forming.

According to embodiments of the invention, a plurality of fastening seats are set for described at least one in the bossing.This makes the axle holding element to be fixed on the bossing reliably.Can be effectively and disposed axle holding member compactly, guarantee the gap of itself and rocking arm simultaneously.

Will clearer further Applicable scope of the present invention from following given detailed description.Yet, be understood that, because according to this detailed description, various changes within the spirit and scope of the present invention and modification all are conspicuous to one skilled in the art, although therefore described detailed description and concrete example shown the preferred embodiments of the present invention, they only are that mode with example provides.

Description of drawings

To more fully understand the present invention from following given in conjunction with the accompanying drawings detailed description, wherein accompanying drawing only provides in the mode of example, is not limitation of the present invention therefore, in the accompanying drawings:

Fig. 1 is the lateral plan of expression according to the motor bike of first embodiment of the invention;

Fig. 2 is the amplification longitudinal sectional view of this motor bike front portion of expression;

Fig. 3 is that the line 3-3 along Fig. 1 cuts open the cutaway view of getting;

Fig. 4 is the enlarged view of expression by the represented part of the arrow 4 of Fig. 3;

Fig. 5 is that the line 5-5 along Fig. 4 cuts open the cutaway view of getting;

Fig. 6 is the view along the arrow 6-6 of Fig. 4;

Fig. 7 is the view along the arrow 7-7 of Fig. 4;

Fig. 8 is the lateral plan of expression according to the motor bike of second embodiment of the invention;

Fig. 9 is the cutaway view that the line 5-5 in Fig. 4 cuts open another embodiment that gets; And

Figure 10 is the cutaway view that the line 7-7 in Fig. 4 cuts open another embodiment that gets.

The specific embodiment

Describe below with reference to accompanying drawings and implement specific embodiments of the invention.

With reference to Fig. 1, the body shell F of pedal motorcycle comprise head pipe 17, a pair of about pipe 18 down ..., a pair of left and right sides bottom tube 19 ... and be responsible for 20 about a pair of ...Head pipe 17 operably supporting pivot the front fork 15 that supports front-wheel WF and with front fork 15 bonded assembly signaling handles 16.Under manage 18 ... from the beginning managing 17 extends backward and downwards.Bottom tube 19 ... be arranged on down pipe 18 to be connected form in a row with head pipe 17 ... the below, and with than under manage 18 ... extend backward and downwards at littler inclination angle.Be responsible for 20 ... with bottom tube 19 ... the lower end connect and extend back.In addition, following pipe 18 ... the rear end be responsible for 20 ... the middle part connect.

Engine lifting bracket 19a ... be bonded on bottom tube 19 ... lower end.Engine lifting bracket 19a ... along bottom tube 19 ... bearing of trend extend.Be responsible for 20 ... from bottom tube 19 ... with engine lifting bracket 19a ... between the junction near point extend back.Reinforced company's fishplate bar 21 ... be arranged in down pipe 18 ... with bottom tube 19 ... between center.

With reference to Fig. 2, be responsible for 20 and for example engage and form by preceding half sloping portion 20a, later half sloping portion 20b and the mutual one of sweep 20c.Preceding half sloping portion 20a from the lower end of bottom tube 19 backward and extend upward.Later half sloping portion 20b extends backward and downwards.Sweep 20c bends to and protrudes upward and connect the rear end of preceding half sloping portion 20a and the front end of later half sloping portion 20b.Being responsible for 20 is that vertically length is greater than the essentially rectangular pipe along the length of horizontal direction.In addition, the lower end of following pipe 18 is by the middle part of welded joint at preceding half sloping portion 20a.

The front end of the seat rail 23 that makes progress and extend back is connected on the front portion of later half sloping portion 20b.Described a pair of left and right sides seat rail 23 ... the rear portion one be bonded together.Back pipe 24 ... the rear end by welded joint at seat rail 23 ... the rear portion.Back pipe 24 ... backward and extend upward, and its front end is bonded on later half sloping portion 20b ... the rear end on.In addition, at seat rail 23 ... with back pipe 24 ... between centre portion in also be furnished with reinforced company's fishplate bar 25 ...

Body shell F also comprises power unit PA, and this power unit PA comprises four-stroke motor EA and deceleration change-speed box M.The deceleration of deceleration change-speed box M by necessity is transferred to trailing wheel WR with the output of driving engine EA.Driving engine EA can for example form water-cooled single cylinder structure.Driving engine EA comprises crankcase 28, cylinder block 29, cylinder head 30 and housing 31.Cylinder block 29 has the cylinder-bore axis that extends vertically upward from crankcase 28.Cylinder head 30 is connected the upper end of cylinder block 29.Housing 31 is connected the place, summit of cylinder head 30.

First engine lifting bracket 32 is approaching pipe 18 down in body shell F ... the point place of lower end is arranged in and is responsible for 20 ... preceding half sloping portion 20a in.The top of crankcase 28 is by first engine lifting bracket 32 ... be supported on the some place of cylinder block 29 front portions among the driving engine EA.Cylinder block 29 and cylinder head 30 are arranged in is responsible for 20 ... sweep 20c ... between.Second engine lifting bracket 33 ... with pair of bolts 43 ... be connected engine lifting bracket 19a ... the lower end, this engine lifting bracket 19a ... be connected bottom tube 19 ... the lower end.Bottom on the front side of crankcase 28 is bonded on second engine lifting bracket 33 by bolt 44 ... go up and by second engine lifting bracket 33 ... support.

As mentioned above, driving engine EA can be by being responsible for 20 ... be supported on part place with higher stiffness.In addition, first engine lifting bracket 32 ... by with pair of bolts 26 ... fastening and be arranged in and be responsible for 20 ... preceding half sloping portion 20a ... on, this is to bolt 26 ... to be derived from down pipe 18 ... the extension line of line of centers is clipped in the middle from both sides.The crankcase 28 of driving engine EA is by the fastening pipe 18 that is arranged in down ... bolt 27 on the extension line of line of centers and be supported on first engine lifting bracket 32 ... on.Like this, crankcase 28 just is supported on first engine lifting bracket 32 effectively ... on, and rigidity is improved.

With reference to Fig. 3, be supported on rotationally bent axle 34 on the crankcase 28 comprise as a pair of crank arm 34a, the 34a of one body component and with this crank arm 34a, 34a bonded assembly crank pin 34b.The piston 35 that is assemblied in slidably in the cylinder block 29 is being connected on the crank pin 34b between crank arm 34a, the 34a by connecting rod 36.

One end of bent axle 34 stretches out from crankcase 28 in the left side along the direction that motor bike is advanced.AC (interchange) electrical generator 39 forms by being fixed on rotor 37 on bent axle 34 1 ends and the stator 38 that is contained in this rotor 37.AC driving engine 39 is covered by the left side cover 40 that engages with crankcase 28.Stator 38 is fixed on the left side cover 40.

Camshaft 41 is supported on the cylinder head 30 rotationally, thereby is formed for opening and closing the parts of the valve train of the air inlet valve that is arranged in the cylinder head 30 and blow off valve (not shown).Timing control change-speed box 42 is set at camshaft 41 and between the bent axle 34 between crankcase 28 and the AC driving engine 39.Timing control change-speed box 42 reduced to half with the speed of the rotary driving force of bent axle 34 before power is transferred to camshaft 41.

Change speed gear box main body 45 is connected on the crankcase 28 on the right side along the motor bike direct of travel.Change speed gear box main body 45 extends back from crankcase 28.Be bonded on the right side cover 46 on change speed gear box main body 45 right sides, gear case 47 and the change speed gear box main body 45 that is bonded on the right side in change speed gear box main body 45 rear portions constituted change speed gear box 48.In addition, change-speed box chamber 49 is formed between change speed gear box main body 45 and the right cover 46.Gear chamber 50 is formed between change speed gear box main body 45 and the gear case 47.

Deceleration change-speed box M comprises variable v-belt drive 51, reduction gear train 52 and output shaft 60.The toric transmission 51 unlimited velocity ratios that change the rotary driving force of bent axle 34.Reduction gear train 52 makes from the output speed of toric transmission 51 and reduces.Output shaft 60 provides propulsive effort to trailing wheel WR, and its speed reduces by reduction gear train 52.Toric transmission 51 is contained in the change-speed box chamber 49.Reduction gear train 52 is contained in the gear chamber 50.

Toric transmission 51 comprises driving pulley 53, driven pulley 55 and endless belt 56.Driving pulley 53 is installed in the other end of bent axle 34 in the face of change-speed box chamber 49.Driven pulley 55 is installed in transmission shaft 54 in the face of on the part of change-speed box chamber 49.Transmission shaft 54 has the axis that extends in parallel with bent axle 34 and is supported rotationally by the rear portion of change speed gear box 48.Endless belt 56 twines around driving pulley 53 and driven pulley 55.

The sliding motion of driving pulley 53 by slip pipe 57 changes the winding radius with 56, makes this slip pipe 57 endwisely slipping along bent axle 34 by operating unshowned motor etc.On the other hand, driven pulley 55 is according to changing winding radius with 56 with the variation of 56 cooling diameters towards opposite sides with driving pulley 53.Centrifugal clutch 58 is plugged between driven pulley 55 and the transmission shaft 54.

The end of transmission shaft 54 is arranged in the face of gear chamber 50.The reduction gear train 52 that is contained in the gear chamber 50 comprises driving gear 61, intermediate gear 62 and driven gear 63.Driving gear 61 is formed on the end of transmission shaft 54.Intermediate gear 62 and driving gear 61 engagements.Driven gear 63 and intermediate gear 62 engagements.Intermediate gear 62 and driven gear 63 are supported about the axis parallel with transmission shaft 54 rotationally by change speed gear box main body 45 and gear case 47 respectively.

With reference to Fig. 4, driven gear 63 is used as the final stage transfer element among the deceleration change-speed box M and is included in the columnar shaft part 63a of the center combination.The end of shaft portion 63a is supported by bearing seat 45a rotationally by means of ball-bearing casing 64.Bearing seat 45a becomes one with the rear portion of change speed gear box main body 45 in change speed gear box 48.In addition, the rear portion of the gear case 47 in the change speed gear box 48 comprises annular opening part 65, and this annular opening part 65 forms corresponding with bearing seat 45a.The other end of shaft portion 63a is arranged in the opening portion 65 coaxially.In addition, ball-bearing casing 66 was inserted between the interior week of the periphery of shaft portion 63a and opening portion 65.And, be arranged in ball-bearing casing 66 exterior lip rings 67 and be inserted between the interior week of the periphery of shaft portion 63a and opening portion 65.

Output shaft 60 is connected on the shaft portion 63a of driven gear 63 by spline 68.Rear portion and part that output shaft 60 passes gear case 47 reach left side in gear case 47 rear portions.More specifically, output shaft 60 with can be along axis direction dismounting and can not about this axis in relative rotation mode be connected coaxially on the driven gear 63.

The axle 69 of trailing wheel WR is supported by the rear portion pivot of rocking arm 70.Rocking arm 70 comprises rocking arm principal part 70a and pair of support arms part 70b, 70c, and they become one each other.Rocking arm principal part 70a forms the roughly shape of U-shaped by both sides and the front that is arranged in trailing wheel WR.Described support arm portion 70b, 70c are carried out clamping to them in each Background Region of change speed gear box main body 45 that forms part change speed gear box 48 and gear case 47.This to support arm portion 70b, 70c by means of first pivot 71 with coaxial second pivot 72 of first pivot 71 and support swingably by the rear portion of power unit PA.First pivot 71 and second pivot 72 and output shaft 60 coaxial arrangement.

With reference to Fig. 5, first pivot 71 is removably mounted on the outside face in gear case 47 rear portions in the change speed gear box 48.First pivot 71 forms cylindricality, thereby centers on output shaft 60 from the gear case 47 coaxial sponsons that stretch out.First pivot 71 comprises the flange portion 71a that is integrally formed therewith and crosses out near the end of gear case 47.Flange portion 71a is by a plurality of, and for example four bolt 73A, 73A, 73A, 73B removably are bonded on the change speed gear box 48, and described four bolt 73A, 73A, 73A, 73B arrange at interval along the circumferencial direction of first pivot 71.Flange portion 71a forms and is installing under the release position and can bolt 73A be installed under the release position along the plane motion of the axis that is approximately perpendicular to first pivot 71 ..., 73B unclamps.Pull down output shaft 60 and unclamp power unit PA and the state of the installation of change speed gear box 48 under, can move and pull down first pivot 71 along the direction that is approximately perpendicular to described axis by making first pivot 71 from power unit PA.

Bolt 73A ..., the live part of 73B is promptly according to three bolt 73A in whole four bolts of this embodiment of the invention ... in lateral plan, be arranged on the outer peripheral portion of change speed gear box 48.Be used to engage a plurality of bolts 74,74 of change speed gear box main body 45 and gear case 47 ... arranged spaced apart each other on the outer peripheral portion of change speed gear box 48.Pass each bolt 74,74 of change speed gear box main body 45 ... be screwed in the gear case 47.Therefore, be arranged in the bolt 73A on the outer peripheral portion of change speed gear box 48 ... be arranged in roughly and a plurality of bolts 74 ... along the corresponding position, position that the outer peripheral portion of change speed gear box main body 45 and gear case 47 is arranged, thereby change speed gear box main body 45 and gear case 47 are engaged with each other.Pass each bolt 73A of flange portion 71a and gear case 47 ... be screwed in order in the change speed gear box main body 45, thereby not only first pivot 71 be fastened on the change speed gear box 48, and change speed gear box main body 45 is engaged with gear case 47.

As mentioned above, be used for first pivot 71 is fastened to bolt 73A on the change speed gear box 48 ..., the live part of 73B, i.e. bolt 73A ... in lateral plan, be arranged on the outer peripheral portion of change speed gear box 48.Therefore, first pivot 71 can be fastened on the part that change speed gear box 48 has high rigidity.Therefore, even moving or acting on first pivot 71, can prevent that also a part of change speed gear box 48 on the side of gear case 47 from deforming at load under the similar state at motor bike.This can eliminate the situation that unnecessary distortion takes place in the shaft portion of each gear 61 to 63 in gear case 47.And, bolt 73A ... also play the effect of mutual fastening change speed gear box main body 45 and gear case 47.This helps to reduce fastening change speed gear box main body 45 and gear case 47 and the required bolt quantity of first pivot 71 is installed on change speed gear box 48.

With reference to Fig. 9, primary shaft element 171 is removably mounted on the outside face in gear case 147 rear portions in the change speed gear box 148.Primary shaft element 171 forms cylindricality, thereby the sponson of pivot 160 is provided, and this sponson stretches out from gear case 147, and passes coaxially betwixt, and pivot is supported on the output shaft 160.Primary shaft element 171 passes and can unsteadily support the first support arm portion 170b.The end of primary shaft element 171 adjacent teeth roller boxs 147 comprises the flange portion 171a that is integrally formed therewith and crosses out.

Flange portion 171a is bonded on the change speed gear box 148 by a plurality of for example four bolt 173A, 173A, 173A, 173B detouchables, and described bolt is arranged on the ring Zhou Fangxiang of primary shaft element 171 at interval.Be formed on each front end place of four circumferential isolated bolt positions of flange portion 171a towards the sweep 171aa of change speed gear box 148 lateral bending songs.This sweep 171aa ... use bolt 173A ..., 173B is fixed on the change speed gear box 148.At bolt 173A ... under the installation release position that 173B unclamps, sweep 171aa ... be resisted against on the gear case 147 of change speed gear box 148, thereby extend along plane, so that sweep 171aa perpendicular to primary shaft element 171 axis ... move along the direction that is approximately perpendicular to the axis of primary shaft element 171.Therefore, at bolt 173A ..., under the installation release position that 173B unclamps, flange portion 171a can be along the plane motion of the axis that is approximately perpendicular to primary shaft element 171.Pull down output shaft 160 and unclamp power unit PA and the state of the installation of change speed gear box 148 under, by moving along the direction that is approximately perpendicular to described axis and primary shaft element 171 can being pulled down from power unit PA.

Flange portion 171a forms the outward flange that its part at least extends to change speed gear box 148.Three sweep 171aa ... extend to the outward flange of change speed gear box 148.Extend to the outer peripheral sweep 171aa of change speed gear box 148 ... use bolt 173A ..., three bolt 173A among the 173B ... be bolted on the change speed gear box 148.

A plurality of bolts that are spaced apart from each other 174,174 ... be arranged on the outer peripheral portion of change speed gear box 148, thereby change speed gear box main body 145 is engaged with gear case 147.Each passes the bolt 174,174 of change speed gear box main body 145 ... all be screwed in the gear case 147.Therefore, be arranged in the bolt 173A on the outward flange of change speed gear box 148 ... be arranged in roughly and a plurality of bolts 174 ... along the corresponding position, position that the outer peripheral portion of change speed gear box main body 145 and gear case 147 is arranged, thereby change speed gear box main body 145 and gear case 147 are engaged with each other, and this change speed gear box main body 145 and gear case 147 are constituted to small part change speed gear box 148.Pass each bolt 173A of flange portion 171a and gear case 147 ... all be screwed in order in the change speed gear box main body 145, thereby not only primary shaft element 171 be fastened on the change speed gear box 148, and change speed gear box main body 145 is fastened on the gear case 147.

Needle bearing 75 and the lip ring 76,77 that is arranged on this needle bearing 75 inside and outside are inserted between the output shaft 60 and first pivot 71 that passes first pivot 71.

Support arm portion 70b in the rocking arm 70 comprises supported hole 78, and the output shaft 60 and first pivot 71 pass this supported hole 78.Needle bearing 79 and be arranged in lip ring 80,81 on this needle bearing 79 inside and outside and be inserted between the interior week of the periphery of first pivot 71 and supported hole 78.Wherein the oscillating motion that helps to stablize rocking arm 70 of first pivot 71 structure of passing the support arm portion 70b of rocking arm 70 is supported.This structure also can provide the secure support to output shaft 60.

The support arm portion 70b from rocking arm 70 is protruding for the outer end portion of output shaft 60.Drive sprocket 82 is fastened on this part of the output shaft 60 that stretches out from rocking arm 70.On the other hand, as shown in Figure 1, driven sprocket 83 is fastened on the axle 69 of trailing wheel WR in the left side along the direction of motorcycle driving.Loop chain 84 twines around drive sprocket 82 and driven sprocket 83.

With reference to Fig. 6, the output axle bed 85 that is used for covering the outer end portion of output shaft 60 is installed in the side of the front end outside face of rocking arm 70 support arm portion 70b.Output axle bed 85 comprises as the bearing seat part 85a of its integral part and hold-down arm part 85b, 85c, 85d.Bearing seat part 85a forms annular slab, thereby covers the outer end of output shaft 60.Hold-down arm part 85b, 85c, 85d form from circumferential each other isolated three positions of bearing seat part 85a and stretch out.The outer end portion of output shaft 60 is supported by bearing seat part 85a rotationally by means of ball-bearing casing 86.

Drive sprocket 82 is fastened on the part that output shaft 60 stretches out from rocking arm 70.Drive sprocket 82 is for being used for the propulsive effort of output shaft 60 is transferred to the propulsive effort transfer wheel of trailing wheel WR.On the other hand, as shown in Figure 1, driven sprocket 83 is fastened on the axle 69 of trailing wheel WR in the left side along the motor bike direct of travel.Loop chain 84 twines around drive sprocket 82 and driven sprocket 83.

Hold-down arm part 85b among hold-down arm part 85b, 85c, the 85d extends back from bearing seat part 85a.The fore-end of hold-down arm part 85b removably is fastened on the left-hand face of rocking arm.Remaining hold-down arm part 85c, 85d extend respectively up and down from bearing seat part 85a.The fore-end of hold-down arm part 85c, 85d removably is fastened on stay bearing plate part 70d, the 70e by bolt 88,88.

With reference to Fig. 6, in perpendicular to the multiview drawing on the plane of output shaft 60 axis (plane that extends in parallel with the paper surface of Fig. 6), be used for the flange portion 71a of primary shaft element 71 is fastened to a plurality of bolt 73A of change speed gear box 48 ..., 73B outwards arranges from the periphery of drive sprocket 82.

The output axle bed 85 that is used for covering the outer end portion of output shaft 60 is installed in the side of front end outside face of the first support arm portion 70b of rocking arm 70.Output axle bed 85 comprises as the bearing seat part 85a of its integral part and hold-down arm part 85b, 85c, 85d.Bearing seat part 85a forms circular slab, thereby covers the outer end of output shaft 60.Hold-down arm part 85b, 85c, 85d form from three positions that the circumferencial direction along bearing seat part 85a is spaced apart from each other and stretch out.The outer end portion of output shaft 60 is supported by bearing seat part 85a rotationally by means of ball-bearing casing 86.

Stay bearing plate part 70d, 70e are arranged in respectively on the top and lower part of the first support arm portion 70b in the rocking arm 70 integratedly.Be used for hold-down arm part 85b, 85c, 85d be installed in bolt 87,88,88 on the rocking arm 70 be arranged in perpendicular to the multiview drawing on the plane of the axis of output shaft 60 (plane of extending with the paper plane parallel of Fig. 6) not with bolt 73A ..., 73B position overlapped place, described bolt 73A ..., 73B is used for primary shaft element 71 is installed in change speed gear box 48.These structures make the first support arm portion 70b obtain higher support stiffness by the complementation of primary shaft element 71 and output axle bed 85.

The first half that is fastened on the drive sprocket 82 on the output shaft 60 is arranged to expose forward from the bearing seat part 85a of output axle bed 85.Fender 89 is arranged in the front of drive sprocket 82, and it forms semicircle, thereby covers the first half of drive sprocket 82 from direction forward.

Cylindricality pad 90 ... an end (referring to Fig. 4) be resisted against on stay bearing plate part 70d, the 70e.Fender 89 is clipped in pad 90 ... the other end and hold-down arm part 85c, 85d between.In addition, pass hold-down arm part 85c, 85d, fender 89 and pad 90 ... bolt 88 ... be screwed among stay bearing plate part 70d, the 70e.

Second shaft element 72 passes the second support arm portion 70c in the rocking arm 70, and removably is fastened on the power unit PA.According to the first embodiment of the present invention, second shaft element 72 is the bolts that are screwed in the cylindrical bodies 91, and this cylindrical bodies 91 is inserted to be connected with change speed gear box main body 45 in the change speed gear box 48 of power unit PA.

The second support arm portion 70c of rocking arm 70 comprises that supported hole 92, the second shaft elements 72 pass this supported hole 92.A pair of ball-bearing casing 93,93 was inserted between the interior week of the periphery of second shaft element 72 and supported hole 92.Each ball-bearing casing 93 ... race, inner all be clipped between the end of annular shoulder 72a and cylindricality pad 94.Shoulder 72a is arranged on the periphery of second shaft element 72.Pad 94 is arranged to center on coaxially second shaft element 72 and its other end outer end against cylindrical bodies 91.In addition, lip ring 95 is inserted in the periphery and the ball-bearing casing 93 of pad 94 ... between the interior week of the supported hole 92 on the inboard.Lip ring 96 is inserted in the periphery and the ball-bearing casing 93 of second shaft element 72 ... between the interior week of the supported hole 92 on the outside.

With reference to Fig. 7, the outer end portion of second pivot 72 is kept regularly by pivotal block 97, and this pivotal block 97 is removably mounted on the change speed gear box main body 45 of change speed gear box 48.Pivotal block 97 makes mounting portion 97b and retaining part 97a form one.Retaining part 97a is roughly annular and a circumferential location therein is formed with slit 98.Mounting portion 97b stretches out to the side from retaining part 97a.The bolt 99 that crosses slit 98 is screwed among the retaining part 97a.Therefore, the outer end portion of second pivot 72 is kept in position regularly by retaining part 97a when bolt 99 is fastened on the retaining part 97a, and wherein bolt 99 is in the state of the outer end portion of passing second pivot 72.

A plurality of for example two bossings 100,101 under the state that stretches out on the extraneous part of the oscillating motion of rocking arm 70 place is wholely set change speed gear box main body 45 at the change speed gear box 48 of power unit PA.Bossing 100,101 is arranged to the mounting portion 97b against pivotal block 97.Each of mounting portion 97b is with two bolts 102,102 ... removably be fastened on the bossing 100,101.

Upwardly extending a pair of carriage 106 ... be arranged in the rear portion of change speed gear box 48.These carriages 106 ... by being responsible for 20 ... rear end part support.Shown in Fig. 1 is clear, a pair of main support axle 107 ... be arranged in the rear lower office of change speed gear box 48 coaxially.Main support 108 centers on this to main support axle 107 ... pivoted rotationally and supported.In addition, cross branch 109 is arranged in and is responsible for 20 ... sweep 20c ... between.Rear shock absorber 110 with the axis that extends along fore-and-aft direction is arranged between the cross branch 109, and shock absorber support 111 is arranged in the front portion of rocking arm 70.

With reference to Figure 10, the outer end portion of second shaft element 272 is kept regularly by axle holding element 297, and this holding element 297 is removably mounted on the change speed gear box main body 245 of the change speed gear box 248 among the power unit PA.Axle holding element 297 moulded parts for casting or other type, it makes retaining part 297a and mounting portion 297b become one.Retaining part 297a is roughly annular, and a circumferential location therein is formed with slit 298.Mounting portion 297b from retaining part 297a to extending laterally.The bolt 299 that crosses slit 298 is screwed among the retaining part 297a.Therefore, when the bolt 299 in being in the state that passes second shaft element, 272 outer end portion was fastened on the retaining part 297a, the outer end portion of second shaft element 272 remained on suitable position regularly by retaining part 297a.

Change speed gear box main body 245 in the change speed gear box 248 of power unit PA comprises a plurality of for example two bossings 2100,2101, and this bossing for example is arranged to stretching out state and its formation one, thereby from the above and below clamping second support arm portion 270c.Bossing 2100,2101 is protruding from the second support arm portion 270c, simultaneously in its top view with rocking arm 270 in the second support arm portion 270c overlapping.In addition, bossing 2100,2101 is arranged in the extraneous position of oscillating motion of the second support arm portion 270c that drops in the rocking arm 270.

Comprise a plurality of, a pair of fastening seat 2100a, 2100b, 2101a, the 2101b that is arranged on its front end for example according at least one bossing in two bossings 2100,2101 of the embodiment of the invention or two bossings 2100,2101. Fastening seat 2100a, 2100b, 2101a, 2101b are against the mounting portion 297b of axle holding element 297.The mounting portion 297b bolt 2102,2102 of axle holding element 297 ... removably be fastened on fastening seat 2100a, 2100b, 2101a, the 2101b.

The position of fastening seat 2100a, 2100b in the bossing 2100 forms like this, and promptly the distance L 1 of the center to center between the fastening seat 2100a of the location forwardly among two fastening seat 2100a, the 2100b and second shaft element 272 is greater than the distance L 2 at fastening the 2100b and the center to center between second shaft element 272 of location, rear portion.The position of fastening seat 2101a, 2101b in the bossing 2101 forms like this, promptly between the fastening seat 2101a of the location forwardly among two fastening seat 2101a, the 2101b and second shaft element 272 distance L 3 of center to center greater than distance L 4 at fastening the 2101b and the center to center between second shaft element 272 of location, rear portion.More specifically, this of the second support arm portion 270c of clamping rocking arm 270 comprises be used for fastener shaft holding element 297 described to fastening seat 2100a, 2100b, 2101a to bossing 2100,2101.2101b。In each bossing 2100,2101, the distance that the position of each fastening seat 2100a, 2100b, 2101a, 2101b all forms from the center of second shaft element 272 each fastening seat 2100a, 2100b, 2101a, 2101b less than with the distance of fastening seat 2100a, the 2101a of location forwardly.

A pair of upwardly extending support 2106 ... be arranged in the rear portion of change speed gear box 248.These supports 2106 ... by being responsible for 220 ... rear end part support.

Shown in Fig. 1 is clear, a pair of main support axle 107 ... be arranged in coaxially on the rear lower of change speed gear box.Main support 108 centers on this to main support axle 107 ... pivoted rotationally and supported.In addition, cross branch 109 is arranged in and is responsible for 20 ... sweep 20c ... between.Rear shock absorber 110 with the axis that extends along fore-and-aft direction is arranged in center cross 109 and is arranged between the rear shock absorber support 111 of rocking arm 70 front portions.

Specifically with reference to Fig. 2, the downstream end of the air inlet pipe 112 that extends forward from cylinder head 30 is connected on the front side surface of cylinder head 30.Fuel injection valve 113 is being installed on the cylinder head 30 near the junction of air inlet pipe 112.The upstream extremity of air inlet pipe 112 is connected on the airfilter 115 by throttling bodies 114.

Radiator 116 is arranged in the office, preceding bottom of airfilter 115, thereby makes radiator 116 be positioned at the front of driving engine EA.Radiator 116 coolings are by the engine coolant of liquid-cooled engine EA heating.Hold-down arm part 117 ... engine lifting bracket 19a towards body shell F ... one side is stretched out and is arranged on the bottom of radiator 116.Hold-down arm part 117 ... by means of Rubber Parts 119 is installed ... by being arranged in engine lifting bracket 19a ... on support 118 ... support.In addition, the hold-down arm part 120 ... towards the bottom tube 19 that is positioned at radiator 116 tops ... one side is stretched out, and is arranged on the top of radiator 116.Hold-down arm part 120 ... by means of the Rubber Parts (not shown) being installed by being arranged in bottom tube 19 ... on support 121 ... support.That is, radiator 116 is by bottom tube 19 ... engine lifting bracket 19a with body shell F ... support.

The upstream extremity of freeing pipe 122 is connected on the rear side surface of the cylinder head 30 among the driving engine EA.The downstream end of freeing pipe 122 is connected with exhaust muffler 123 on being arranged in trailing wheel WR right side.

Specifically with reference to Fig. 1, body shell F and power unit PA use the vehicle body cover of being made by synthetic resin 125 to cover.Vehicle body cover 125 comprises front shroud 126, middle cover 127, a pair of left and right sides foot protection plate 128 ..., floor tunnel part 129 and back cover 130.Front shroud 126 covers the front portion of head pipe 17 and the top of front-wheel WF.In cover 127 continuous by cover head pipe 17 from rear side with front shroud 126.Be used to hide the foot protection plate 128 of the front portion of jockey's shank ... be bonded on the respective side of front shroud 126.Floor tunnel part 129 extends to foot protection plate 128 ... with middle cover 127.Back cover 130 covers the left and right sides at body shell F rear portion.

Storage box 134 is arranged in the below of jockey's seat 131.This storage box 34 has the upper end open part, and this upper end open part can be opened and closed by the base plate 132 of jockey's seat 131.Storage box 134 is by being responsible for 20 ... with seat rail 23 ... support.

Storage box 134 is arranged in the top of rear shock absorber 110, and rear shock absorber 110 is arranged between the cross branch 109 of body shell F and the rocking arm 70 and along fore-and-aft direction and extends.The bottom of storage box 134 has to the cross section of the roughly U-shaped of under shed, thus from the top across on rear shock absorber 110.

Fuel tank 135 is arranged in the rear of storage box 134.Can be by opening jockey's seat 131 to fuel tank 135 filling fuels.Fuel tank 135 is by back pipe 24 ... rear elastic ground support.

The operation of first embodiment of the invention will be described below.Be included among the power unit PA output shaft 60 with can be along axis direction dismounting and can not about this axis in relative rotation mode be connected on the driven gear 63 as the final stage transfer element of deceleration change-speed box M.Output shaft 60 also is arranged to make its outer end portion to stretch out outside the rocking arm 70.The first and second support arm portion 70b, 70c are arranged in the left and right sides in the place ahead of rocking arm 70 front portions, and on the other hand, by means of cylindricality primary shaft element 71 and second shaft element 72 and support swingably by the change speed gear box among the power unit PA 48, it is coaxial with primary shaft element 71 that primary shaft element 71 has output shaft 60, the second shaft elements 72 that pass coaxially wherein.Primary shaft element 71 is by being removably mounted on the change speed gear box 48 in the mode that can discharge from the change speed gear box 48 of power unit PA along the plane motion that is approximately perpendicular to its axis under the installation release position.Second shaft element 72 removably is fastened on the change speed gear box 48 in the mode that can be in axial direction under fixing release position discharges from the change speed gear box 48 of power unit PA.

Be used for the oscillating motion supporting construction of the rocking arm 70 on the power unit PA according to this, as described below from power unit PA dismounting rocking arm 70.More specifically, unclamp output shaft 60, unclamp primary shaft element 71 fixing with respect to power unit PA, unclamp second shaft element 72 from power unit PA, and pull down output axle bed 85 from rocking arm 70 from power unit PA.Then, pull down rocking arm 70 from power unit PA.Aforementioned demounting procedure is put upside down, rocking arm 70 can be ressembled on the power unit PA.Therefore, can conveniently carry out dismounting or the reloading procedure of rocking arm 70 with respect to power unit PA.This structure has also been eliminated separately necessity of rocking arm 70, has so just reduced the quantity of used unit.In addition, second shaft element 72 removably is fastened on the power unit PA in the mode that can unclamp along axis direction from power unit PA under fixing release position.This structure makes second shaft element 72 to unclamp from power unit PA, interferes to prevent second shaft element 72 and the dismounting or the reloading procedure of rocking arm 70 with respect to power unit PA.This has strengthened the operability of dismounting and refitting process.

In addition, the single type of rocking arm 70 is molded with the quantity that helps reduce used unit, and has improved the assembly precision of rocking arm 70 with respect to power unit PA.This structure is also by making a plurality of elements engage to have eliminated necessity of the fastening structure that is used to assemble rocking arm 70 with bolt etc.This helps to strengthen the rigidity of rocking arm 70 itself, and has reduced the weight of unspringing weight.

In addition, rocking arm 70 can unsteadily be supported by the power unit PA that is installed among the body shell F, thereby drives trailing wheel WR.This has eliminated the necessity of arranging body shell F in the oscillating motion support section vicinity of rocking arm 70.By utilizing the rigidity of power unit PA, the oscillating motion that can stablize rocking arm 70.

Output axle bed 85 is removably mounted on the front portion of rocking arm 70, thereby covers and support rotationally the outer end portion of output shaft 60.Therefore export axle bed 85 also with the supporting member and the cladding element that act on output shaft 60.This has not only improved presentation quality, even also failure-free supports for output shaft 60 provides more.

In addition, the outer end portion of passing rocking arm 70 and being screwed into second pivot 72 on the change speed gear box 48 among the power unit PA is kept regularly by pivotal block 97, and this pivotal block 97 is on the extraneous part of the oscillating motion of rocking arm 70 place is removably mounted on a plurality of bossings 100,101 on the change speed gear box 48 that is located at power unit PA.Can realize the dual-support structure of second pivot 72, and can make that second pivot 72 that is used for preventing the being screwed into power unit PA used number of components that gets loose is minimum with respect to power unit PA.This has not only strengthened the support stiffness of second pivot 72 on power unit PA, has also further stablized the oscillating motion of rocking arm 70 and has supported.

Primary shaft element 71 passes the first support arm portion 70b and forms cylindrical shape, thereby supports the first support arm portion 70b swingably.Flange portion 71a is removably mounted on the change speed gear box 48, and this flange portion 71a stretches out to the side from the end of primary shaft element 71 contiguous change speed gear boxs 48, thereby it extends to the outward flange of the change speed gear box 48 that is included among the power unit PA to small part.Pass primary shaft element 71 and stretch out in the outside of the first support arm portion 70b by the pivot outer end of the output shaft 60 that supports of primary shaft element 71.Then, drive sprocket 82 is fastened on the outer end portion of output shaft 60 in the outside of the first support arm portion 70b.Therefore obtain the support stiffness of rocking arm 70 easily by primary shaft element 71, this is easier to obtain the required intensity of support section.In addition, primary shaft element 71 comprises flange portion 71a, and this flange portion 71a comprises change speed gear box 48 outward flanges that extend to power unit PA and the part with relative higher stiffness, and this flange portion 71a is installed on the change speed gear box 48.Therefore, can more easily obtain rigidity.

Be constituted to the change speed gear box main body 45 and the gear case 47 bolt 73A of a plurality of box elements of small part change speed gear box 48 ... fastening, this bolt 73A ... being formed up to small part is used for flange portion 71a is installed in a plurality of bolt 73A on the change speed gear box 48 ..., 73B.Therefore, so that change speed gear box main body 45 and gear case 47 combinations, can improve the installation rigidity of primary shaft element 71 by part flange portion 71a being fastened on the part that its rigidity relatively improves.This structure also helps to reduce the quantity that is used for fastening change speed gear box main body 45 and gear case 47 and primary shaft element 71 required bolts are installed on change speed gear box 48.

Be used for primary shaft element 71 is fastened to bolt 73A on the change speed gear box 48 ..., the live part of 73B, i.e. bolt 73A ... in lateral plan, be arranged on the outer peripheral portion of change speed gear box 48.Therefore primary shaft element 71 is securable to change speed gear box 48 and has on the part of higher stiffness.Therefore, even when motorcycle driving or at load under the similar situation, act on the primary shaft element 71, can prevent that also change speed gear box 48 from producing distortion in the part of gear case 47 1 sides.This has eliminated the situation that produces unnecessary distortion in the shaft portion of each gear 61 to 63 in gear case 47.

Sweep 71aa towards the edgewise bend of change speed gear box 48 ... be formed on the outer peripheral part that flange portion 71a extends to change speed gear box 48.These sweeps 71aa ... use bolt 73A ... be bolted on the change speed gear box 48.This makes can further inwardly arrange bolt 73A ... head.As a result, can suppress for example increase of vehicle width etc. of body dimensions, for example avoid interference simultaneously with rocking arm 70.

Be used for flange portion 71a is fastened to a plurality of bolt 73A on the change speed gear box 48 ..., 73B outwards arranges from the periphery of drive sprocket 82 in perpendicular to the projection view on the plane of output shaft 60 axis.Even therefore when than heavy load when output shaft 60 acts on the primary shaft element 71, primary shaft element 71 also can be firmly fastened on the change speed gear box 48 of power unit PA.As a result, can further improve the rigidity of the oscillating motion support section of the rocking arm 70 by primary shaft element 71.

Output axle bed 85 is removably mounted on the front portion of rocking arm 70, thereby covers and support rotationally the outer end portion of output shaft 60.Therefore, output axle bed 85 also is used as the supporting member and the cladding element of output shaft 60.This has not only improved presentation quality, but also failure-free supports for output shaft 60 provides more.

The outer end portion of passing rocking arm 70 and being screwed into second shaft element 72 on the change speed gear box 48 among the power unit PA is kept regularly by axle holding element 97, this holding element 97 is removably mounted on a plurality of bossings 100,101, and this bossing 100,101 is arranged on the change speed gear box 48 of power unit PA.Because the simple structure that supports second shaft element 72 with power unit PA and axle holding element 97 has improved the rigidity of second shaft element 72, so can realize the dual-support structure of second shaft element 72 with respect to power unit PA.Thereby the swing that can further stablize rocking arm 70 is supported.Rigidity that can also adjusting shaft holding element 97, thus make according to suitable vehicle and the rigidity of second shaft element 72 is adjusted to exact value.In addition, the number of components that can make second shaft element 72 that is used for preventing being screwed into power unit PA get loose is minimum.This simplified structure makes weight relative with the cost increase less, and power unit PA can be arranged on the inboard of rocking arm 70.Therefore can improve the degree of freedom of body drawing.

Axle holding element 97 comprises retaining part 97a, and this retaining part 97a roughly forms annular, thereby makes the outer end portion of second shaft element 72 pass therein, and is included in the slit 98 of one circumferential location.Second shaft element 72 is kept in position by axle holding element 97 by binding bolt 99, and bolt 99 crosses slit 98 and is screwed among the retaining part 97a.Because the enhancing of second shaft element, 72 rigidity, therefore the axle holding element 97 by simple structure can remain on suitable position reliably with the outer end of second shaft element 72.And, be easy to carry out the maintenance of second shaft element 72 and remove the operation that keeps.

The change speed gear box 48 of power unit PA comprises a plurality of for example a pair of removably bossings 100,101 of installation shaft holding element 97 that are used for.In its top view, be arranged in the position in the oscillating motion scope outside of dropping on rocking arm 70 with the overlapping bossing 100,101 of rocking arm 70.This has guaranteed the oscillating motion stroke of rocking arm 70, and makes that second shaft element 72 can be in position fastening reliably.The tectonic axis holding element 97 compactly.More than all help cost-cutting.

According to being located in the change speed gear box 48 of power unit PA to 100,101 or two bossings 100,101 of small part bossing of first embodiment of the invention, thus protruding from rocking arm 70.This makes and keeps its projection and recess minimum simultaneously by tectonic axis holding element 97 compactly.Therefore, although, also can make a holding element 97 by for example press forming according to the axle holding element 97 of first embodiment of the invention moulded parts for casting or other type.

In addition, according to the described of this embodiment of the invention at least one bossing in the bossing 100,101 or two projectioies are comprised a plurality of fastening seat 100a, 100b, 101a, 101b that are used for fastener shaft holding element 97, described bossing 100,101 is arranged in the change speed gear box 48 of power unit PA in the position of the support arm portion 70c of clamping rocking arm 70.In each bossing 100,101, the position of each fastening seat 100a, 100b, 101a, 101b form make second shaft element 72 the center to the distance of each fastening seat 100a, 100b, 101a, 101b less than with the distance of fastening seat 100a, the 101a of location forwardly.This makes axle holding element 97 can be fixed on reliably on the bossing 100,101.Therefore, can be effectively and disposed axle holding element 97 compactly, guarantee gap simultaneously with rocking arm 70.

Fig. 8 is the lateral plan of expression according to the motor bike of second embodiment of the invention.Identical parts are by representing with Reference numeral identical in first embodiment of the invention.

The body shell F of pedal motorcycle comprises the power unit PB that is mounted thereon, and is used to drive trailing wheel WR.Power unit PB comprises four-stroke motor EB and deceleration change-speed box M, is used for by required deceleration the output of driving engine EB being transported to trailing wheel WR.Driving engine EB for example can form water-cooled twin-tub V-shaped configuration.Driving engine EB comprises rear portion cylinder line (bank) BR and anterior cylinder line BF.Rear portion cylinder line BR upwards promotes from crankcase 28.Anterior cylinder line BF has cylinder-bore axis, and this cylinder-bore axis is inclined upwardly forward and slightly, thereby forms alphabetical V with rear portion cylinder line BR.

Power unit PB supports the front portion of rocking arm 70 swingably, and the rear portion of this rocking arm 70 is used the supporting construction identical with first embodiment of the invention to pivot and supported trailing wheel WR.

Can obtain and the identical effect of the present invention's first example by second embodiment of the invention.

Although got in touch the preferred embodiment of the present invention it is described, what it should be understood that is that this is not intended to the present invention is limited to these embodiment.On the contrary, be intended to cover all replacements, modification and equivalent thereof, as long as they are included in the spirit and scope of the present invention that defined by claims.

For example, in the embodiment of the invention described above, second pivot 72 removably is fastened on power unit PA, the PB.But also can provide a kind of structure, second pivot 72 that wherein removably is fastened on the rocking arm 70 is supported on power unit PA, the PB can insert with the detouchable mode.In addition, second pivot 72 can removably be bolted on power unit PA, PB or the rocking arm 70 with bolt etc.

According to the abovementioned embodiments of the present invention, rocking arm 70 is supported on power unit PA, the PB swingably by first and second shaft elements 71,72 that are divided into left and right sides two halves.Yet suitably, rocking arm 70 also can be supported on power unit PA, the PB swingably by the single shaft element that passes power unit PA, PB.

The rocking arm support component that is used for supporting swingably rocking arm 70 can be a body shell, rather than power unit PA, PB.

In addition, although axle holding element 97 moulded parts for casting or other type according to the above embodiment of the present invention also can form by compacting and make a holding element 97.

Therefore, be apparent that, can describe the present invention in many different modes.These changes should not be considered to break away from the spirit and scope of the present invention, it will be readily apparent to one skilled in the art that all such modifications all should be included in the scope of following claim.

The cross reference of related application

According to 35USC 119, the application requires to reach in the preceence of the Japanese patent application No.2004-357751 of submission on December 10th, 2004 in the Japanese patent application No.2004-328871 that on November 12nd, 2004 submitted to, and its full content is hereby incorporated by.

Claims (17)

1, a kind of structure, be used for supporting the rocking arm of motor bike, wherein, be installed in power unit on the body shell by with coaxial cylindricality first pivot of output shaft with support the front portion of rocking arm swingably with coaxial second pivot of this first pivot; the rear portion of rocking arm pivots and supports trailing wheel; this power unit comprises driving engine and deceleration gear arrangement; this deceleration gear arrangement comprises the output shaft that is used for to trailing wheel supply propulsive effort; this deceleration gear arrangement is set to be used for transmitting the output of driving engine by slowing down, and this structure comprises:

The outer end portion of described output shaft, its from rocking arm protruding and and be operatively coupled on the final stage transfer element of deceleration change-speed box, and can dismantle vertically and insert, can not relatively rotate about axis simultaneously;

Described first pivot, it is removably mounted on the power unit; And

Described second pivot, it removably is fastened on power unit or the rocking arm.

2, the structure that is used for supporting the rocking arm of motor bike according to claim 1 is characterized in that, described second pivot is fixedly can removably be fastened on power unit or the rocking arm to the mode that breaks away from from the power unit shaft under the release position.

3, the structure that is used for supporting the rocking arm of motor bike according to claim 1 is characterized in that described rocking arm is molded integratedly.

4, the structure that is used for supporting the rocking arm of motor bike according to claim 2 is characterized in that described rocking arm is molded integratedly.

5, the structure that is used for supporting the rocking arm of motor bike according to claim 1, it is characterized in that, the output axle bed that is used for supporting rotationally the outer end portion of described output shaft is removably mounted on the front portion of rocking arm, thereby covers the outer end portion of output shaft.

6, the structure that is used for supporting the rocking arm of motor bike according to claim 2, it is characterized in that, the output axle bed that is used for supporting rotationally the outer end portion of described output shaft is removably mounted on the front portion of rocking arm, thereby covers the outer end portion of output shaft.

7, the structure that is used for supporting the rocking arm of motor bike according to claim 3, it is characterized in that, the output axle bed that is used for supporting rotationally the outer end portion of described output shaft is removably mounted on the front portion of rocking arm, thereby covers the outer end portion of output shaft.

8, the structure that is used for supporting the rocking arm of motor bike according to claim 1, it is characterized in that, can keep the pivotal block of the outer end portion of second pivot to be removably mounted on a plurality of bossings regularly, described second pivot passes rocking arm and is screwed in the power unit, and the part place of described a plurality of bossings outside rocking arm oscillating motion scope is arranged in the power unit.

9, the structure that is used for supporting the rocking arm of motor bike according to claim 2, it is characterized in that, can keep the pivotal block of the outer end portion of second pivot detachably to be installed on a plurality of bossings regularly, described second pivot passes rocking arm and is screwed in the power unit, and the part place of described a plurality of bossings outside rocking arm oscillating motion scope is arranged in the power unit.

10, the structure that is used for supporting the rocking arm of motor bike according to claim 3, it is characterized in that, can keep the pivotal block of the outer end portion of second pivot detachably to be installed on a plurality of bossings regularly, described second pivot passes rocking arm and is screwed in the power unit, and the part place of described a plurality of bossings outside rocking arm oscillating motion scope is arranged in the power unit.

11, the structure that is used for supporting the rocking arm of motor bike according to claim 4, it is characterized in that, can keep the pivotal block of the outer end portion of second pivot detachably to be installed on a plurality of bossings regularly, described second pivot passes rocking arm and is screwed in the power unit, and the part place of described a plurality of bossings outside rocking arm oscillating motion scope is arranged in the power unit.

12, a kind of structure that is used for supporting the rocking arm of motor bike, it comprises: a pair of left and right sides support arm portion of extending forward and being arranged in the anterior place of rocking arm, and trailing wheel pivots and is supported in the rear portion, this is supported on the rocking arm support component that is arranged in therebetween by shaft element swingably to left and right sides support arm portion, and this structure comprises:

The outer end portion of shaft element, this outer end portion are passed described at least one in the support arm portion of the left and right sides, and are kept by the axle holding element that is removably mounted on the described rocking arm support component.

13, the structure that is used for supporting the rocking arm of motor bike according to claim 12 is characterized in that, described rocking arm support component comprises and being installed in the body shell to drive the power unit of trailing wheel.

14, the structure that is used for supporting the rocking arm of motor bike according to claim 12, it is characterized in that, described axle holding element roughly forms annular, thereby make the outer end portion of described shaft element pass therein, and be included in the retaining part that wherein a circumferential location has slit; And

Wherein, described shaft element is by a fastening bolt and in keeping in position by the axle holding element, this bolt crosses described slit and is screwed in the described retaining part.

15, the structure that is used for supporting the rocking arm of motor bike according to claim 12 is characterized in that described rocking arm support component comprises a plurality of bossings, is used for removably installation shaft holding element; And

Wherein, in bossing, in its top view, be arranged in position outside the oscillating motion scope that drops on rocking arm with the overlapping bossing of rocking arm.

16, the structure that is used for supporting the rocking arm of motor bike according to claim 15 is characterized in that, be arranged in the rocking arm support component to the described a plurality of bossings of small part, thus protruding from rocking arm.

17, the structure that is used for supporting the rocking arm of motor bike according to claim 15, it is characterized in that at least one that is arranged in the position from above and below clamping rocking arm in a pair of bossing the described rocking arm support component comprises a plurality of fastening seats that are used for the fastener shaft holding element; And

Wherein, position of each fastening seat all is installed in such position, in this position from the center of shaft element to distance of each fastening seat less than with the distance of the fastening seat of location forwardly.

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