CN101085636A - Motorcycle - Google Patents

Abstract

The present invention provides a motorcycle which can prevent the deterioration of the cooling capability caused by the deformation of the cooling pipe such as dent and the like and can increase the direct feeding in the actuating and accelerating. One part of the engine unit (8) is supported by the vehicle body frame (2) in order to swing around the engine unit supporting part (47) of the vehicle body frame (2), the cooling pipe (60) is used for leading the cooling air into the strip chamber (8b), the strip stepless speed changer (17) of the engine unit (8) is accommodated in the strip chamber (8b), the cooling pipe (60) comprises a flexible part (67) which has flexibility and is supported to the vicinity of that part (47) on the vehicle body frame by the engine unit (8) to be connected to the strip chamber (8b), and the part (66b) of the flexible part (67) at the side opposite to the strip chamber (8b) is fixed to the vehicle body frame (2).

Description

Motor bike

Technical field

The present invention relates to motor bike, described motor bike comprises engine unit and body shell, and engine unit is provided with variable v-belt drive, and engine unit is supported for and can be swung vertically by body shell.

Background technology

For example, the common following structure of motor scooter: engine body and variable v-belt drive are made into integration each other in engine unit, engine unit is supported for and can be swung vertically by body shell, trailing wheel is supported in the rear end of engine unit, and the saddle-type vehicle seat is installed on the body shell.

Utilize such motor bike, be delivered to rider's viewpoint from the vibration that suppresses driving engine as far as possible by body shell, engine unit is supported on (referring to for example Fig. 1 of patent documentation 1) on the body shell by bindiny mechanism usually.

In addition, in patent documentation 1, coolant air is incorporated in the band chamber of engine unit the band with the cooling toric transmission by cooling pipe.In the case, in order to absorb the vertical oscillation of engine unit, cooling pipe is connected to the band chamber by the flexible portion of bellow-shaped.

[patent documentation 1] JP-A-2003-182674

Summary of the invention

The problem to be solved in the present invention

Engine unit is supported on situation on the body shell by bindiny mechanism by body shell under, the center of oscillation of engine unit is arranged in the connecting portion of bindiny mechanism and engine unit, the direction of engine unit swing becomes complicated, such as vertical and longitudinal direction.Thereby the flexible portion that the requires cooling pipe corresponding flexibility of direction that is constructed with and swings.Yet, only have under the flexible situation, make easily negative pressure that suction by external force and band chamber causes and on flexible portion, produce distortion such as depression, and can worry that the aspirated air amount reduces and be impaired with the cooling of chamber in some cases.

In addition, wherein engine unit is supported on the problem that the structure on the body shell relates to by bindiny mechanism and is, even when the aperture of carrying out throttle gate is handled, be easy to take place operating lag, when wherein especially starting and when quickening, quicken slow one and clap and just to begin, and the direct sense when therefore lacking starting and acceleration.

In view of above-mentioned conventional situation has been conceived the present invention, and the purpose of this invention is to provide a kind of motor bike, this motor bike can prevent because the deterioration of the caused cooling performance of distortion such as depression of cooling pipe and when improving starting and the direct sense in when acceleration.

The invention is characterized in: a kind of motor bike, comprise engine unit and body shell, engine unit is provided with variable v-belt drive, but body shell supports engine unit so that the engine unit vertical oscillation, the part of engine unit is supported on the body shell with the engine unit support section swing around body shell, motor bike also comprises the cooling pipe that is used for coolant air is introduced the band chamber, the variable v-belt drive of engine unit is contained in the band chamber, and wherein, cooling pipe comprises having flexible flexible portion, and through engine unit be supported on that part on the body shell neighbouring being connected to the band chamber, and flexible portion with the body shell that is fixed to of being with the chamber opposition side.

Herein, in the present invention, the meaning of " part of engine unit is supported on the body shell with the engine unit support section swing around body shell " be engine unit a part and body shell between not have the situation lower support of employed bindiny mechanism in the common unit oscillating driving engine suspension on body shell at motor bike.Thereby, engine unit in center of oscillation roughly not from the engine unit support section out-of-position situation lower swing of body shell.The meaning of " center of oscillation does not roughly have ... skew " is for example by supported situations such as resilient bushings, with the situation in corresponding mobile being included in of the deflection of resilient bushing " center of oscillation does not roughly have ... skew " in addition, in the case.

In addition, in the present invention, the meaning of " part of engine unit is supported on the body shell " is except it comprises the supported situation of crankcase, also comprises supported situations such as cylinder block or cylinder head.

The invention effect

Utilization is according to motor bike of the present invention, because engine unit is supported with the engine unit support section swing around body shell, thus only simply swing vertically of engine unit, thereby, can carry out such structure, promptly wherein the flexible portion of cooling pipe only absorbs vertical fluctuation.Thus, can form a kind of like this flexible portion, the intensity height of this flexible portion to be can dealing with external force and the suction of band in the chamber, and it is hereby ensured the air that sucks q.s, thereby can improve the cooling of band chamber.

According to the present invention, because engine unit is supported for around the engine unit support section of body shell and swings (in other words, and body shell between do not have under the situation of bindiny mechanism supported), so housing improves the responsibility of throttle gate opening operation, thereby can improve starting the time and the direct sense in when acceleration.Promptly, under such bindiny mechanism places situation between engine unit and the body shell, when carrying out the throttle gate opening operation with when halted state begins to travel, can feel operating lag, make motor torque in being delivered to the process of trailing wheel, at first be connected mechanism and absorb, just be delivered to trailing wheel then.As a result, after a slow bat, feel that just vehicle begins to overtake, therefore especially when starting, do not obtain enough direct senses than throttle gate opening operation.According to the present invention, owing to do not insert bindiny mechanism, so can suppress this problem.

Description of drawings

Fig. 1 is the lateral plan that illustrates according to the motor bike of the embodiment of the invention.

Fig. 2 is the lateral plan that the motorcycle body framework is shown.

Fig. 3 is the birds-eye view that body shell is shown.

Fig. 4 illustrates the lateral plan that is supported on the body shell with engine unit that can vertical oscillation.

Fig. 5 is the lateral plan that the balancer mechanism of engine unit is shown.

Fig. 6 is the cutaway view that balancer mechanism is shown.

Fig. 7 is the lateral plan that engine unit is shown.

Fig. 8 is the lateral plan that the cooling pipe that is connected to engine unit is shown.

Fig. 9 is the lateral plan that the flexible tube of cooling pipe is shown.

Figure 10 is the cutaway view (cutaway view that the line X-X in Fig. 8 is got) that cooling pipe is shown.

Figure 11 is the cutaway view (cutaway view that the line XI-XI in Fig. 8 is got) that cooling pipe is shown.

Figure 12 is the plan view that illustrates according to the cross-sectional plane of the engine unit support section of the driving engine of present embodiment.

Figure 13 is the scheme drawing of diagram according to the structure of the balancer mechanism of the driving engine of present embodiment.

Figure 14 (a)-Figure 14 (c) is that diagram is according to the function that piping layout obtained of the driving engine of present embodiment and the scheme drawing of effect.

Description of symbols

1: motor bike 2: body shell

8: engine unit 8b: change speed gear box (band chamber)

8c: crankcase 8j: suspension part (part of engine unit)

8p: band chamber connecting bridge 15: stretcher (leg rest part)

17: variable v-belt drive 18: crank mechanism

18b: bent axle 27: balancer mechanism

27a: balancing device axle 47: pivot member (engine unit support section)

50: resilient bushing (elastic component) 51: pivot (being supported on the part on the body shell)

60: cooling pipe 66b: installation portion (vehicle body fixed part)

67: flexible tube (flexible portion) A: cylinder-bore axis

B: the line of centers of cooling pipe

The specific embodiment

Below embodiment of the invention will be described with reference to drawings.

Fig. 1 to Figure 14 is the view of diagram according to the motor bike of the embodiment of the invention.In addition, in the description of present embodiment the front and back of indication and about the expression from the front and back of observing under the state that is sitting on the vehicle seat and about.

In the accompanying drawings, mark 1 expression motor scooter.Motor bike 1 comprises integrated oscillating type engine unit 8, sending down the fishbone posture body shell 2 and is installed in saddle-type vehicle seat 9 on the body shell 2, wherein said engine unit 8 is provided with variable v-belt drive 17, but body shell 2 supports engine unit 8 so that engine unit 8 vertical oscillations.

Motor bike 1 comprise by the head pipe 3 at the front end place of body shell 2 support and can about turn to front fork 6, be arranged in front fork 6 upper end turn to handgrip 5, be arranged in the lower end of front fork 6 front-wheel 4, be arranged in engine unit 8 rear end trailing wheel 7 and place engine unit 8 and body shell 2 between rear shock absorber 10.

In addition, motor bike 1 comprise the preceding capping 11 of the front side that covers head pipe 3, the rear side that covers head pipe 3 and rider's shank the place ahead leg guard 12, cover the following circumference of vehicle seat 9 side seal lid 13, be arranged in leg guard 12 lower edge stretcher 15 and cover the underseal lid 16 of the bottom of stretcher 15 from the side.Stretcher 15 is arranged on the upper surface of the pedal support 29 that is fixed in body shell 2.

Pipe 20,20, left and right sides vehicle seat beam 21,21 and left and right sides driving engine suspension framework 22,22 under about body shell 2 comprises, wherein down pipe 20,20 from the beginning manage 3 on vehicle-width direction outside bifurcated and extending back, the approximate horizontal extension backward from its lower end then, left and right sides vehicle seat beam 21,21 from about down pipe 20 the middle part backward and tilt to extend upward, then from its rear end backward and approximate horizontal ground extend, left and right sides driving engine suspension framework 22,22 from about down the rear end of pipe 20 extend vertically and be connected to vehicle seat beam 21 in the top.

In addition, about comprising, goes up body shell 2 pipe 24,24, left and right sides vehicle seat stay 25,25 and crossbeam 23, go up wherein pipe 24,24 from the beginning manage 3 roughly straight and extend back, and locate to be connected to vehicle seat beam 21 in its back-end, left and right sides vehicle seat stay 25,25 is connected between left and right sides driving engine suspension framework 22 and the vehicle seat beam 21, crossbeam 23 be connected left and right sides vehicle seat beam 21 on the vehicle-width direction and driving engine suspension framework 22 bonded assembly connecting portions near part between.

Utilize engine unit 8, engine body 8a is connected with change speed gear box 8b one, and wherein variable v-belt drive 17 is contained among the change speed gear box 8b.Airfilter 36 is fixed to the top wall surface of change speed gear box 8b.

Engine body 8a is the water-cooled four-cycle single cylinder engine, this driving engine is guided to install by approximate horizontal with cylinder-bore axis A, and be configured to the preceding mating surfaces that cylinder block 8d, cylinder head 8e and cylinder head cover 8f are connected to crankcase 8c successively, wherein hold crank mechanism 18 in crankcase 8c, crank mechanism 18 is included in the bent axle 18b that approximate horizontal ground is arranged on the vehicle-width direction.

V band toric transmission 17 comprises driving pulley 17a, driven pulley 17b and V band 17c, wherein driving pulley 17a is arranged in the left end place of the bent axle 18 that protrudes among the change speed gear box 8b, driven pulley 17b is arranged in the rear end of change speed gear box 8b, and V band 17c twines around driving pulley 17a and driven pulley 17b.

In addition, main shaft 17d and axle drive shaft 17e are arranged among the change speed gear box 8b, and trailing wheel 7 is installed to axle drive shaft 17e, and wherein the rotation of driven pulley 17b is delivered to main shaft 17d.

V band toric transmission 17 comprises that cooling diameter changes mechanism 26, this cooling diameter changes mechanism 26 and uses controller (not shown) with along with the variable operation of rider to accelerator, based on the band cooling diameter (see figure 4) of controlling and driving belt wheel 17a changeably between upper/lower positions and last position such as engine speed, the speed of a motor vehicle.

Cooling diameter changes mechanism 26 and comprises driving motor 26a, reciprocal driven wheel 26b and train of reduction gears 26c, wherein back and forth driven wheel 26b moves axially to change cooling diameter the movable side channel wheel (not shown) of driving pulley 17b, and train of reduction gears 26c is delivered to reciprocal driven wheel 26b with the rotation of driving motor 26a.

As shown in Figure 5 and Figure 6, engine unit 8 comprises balancer mechanism 27, and this balancer mechanism 27 comprises balancing device axle 27a, and suppresses the engine vibration that causes owing to one-level force of inertia (primary inertia force).It is identical with the rotative speed of the bent axle 18b of crank mechanism 18 that balancer mechanism 27 is configured to its rotative speed, but direction is opposite.

Balancer mechanism 27 comprises balancing device axle 27a and balancing device counterweight 27b, balancing device axle 27a is arranged in the bent axle 18b top in the crankcase 8c, and be arranged to be parallel to bent axle 18b, balancing device counterweight 27b and balancing device axle 27a are integrally formed to be extended with the axis perpendicular to balancing device axle 27a.Balancing device counterweight 27b extends with between the left and right sides counterweight 18a, the 18a that are positioned at bent axle 18b.

End is supported on the crankcase 8c by the bearing 28,28 between itself and the crankcase 8c about balancing device axle 27a, and balancing device gear 27c is connected to the balancing device axle 27a of right bearing 28 inboards by the cushioning members 27d between itself and the balancing device axle 27a.Balancing device gear 27c and the driven wheel 18b ' engagement that is connected to bent axle 18b.

, comprise rotational component and translational component by the one-level force of inertia that rotation produced of the bent axle 18b of crank mechanism 18 herein, rotational component is being rotated and its constant magnitude, and the direction of translational component is fixed, and its size changes with the rotation of bent axle 18b.

In addition, the force of inertia that balancer mechanism 27 is configured to rotational component that the one-level force of inertia by bent axle 18b wherein produces and balancing device axle 27a generation balances each other and the caused acceleration/accel of couple that produces and the acceleration/accel that caused by the translational component of the one-level force of inertia of bent axle 18b are roughly opposite each other on direction about pivot 51, roughly the same in size, wherein pivotal axis 51 is the parts that support engine unit 8.

In order to make two acceleration/accel directions roughly opposite and big or small roughly the same, as shown in figure 12 instantaneous center of turn is arranged on the pivot 51 and gets final product, wherein do not have to produce the vibration that the one-level force of inertia F2 by the one-level force of inertia F1 of crank mechanism 18 and balancer mechanism 27 causes at this instantaneous center place.Below the mode that instantaneous center of turn will be arranged on the pivot 51 is described.

As shown in figure 13, by being the elliptical shape S1 that is scheduled to through the formed shape of track of one-period with the one-level force of inertia F1 of the crank mechanism 18 of vector representation.On the other hand, the one-level force of inertia F2 of balancer mechanism 27 forms the vector locus with positive toroidal S2.Balancing device axle 27a and bent axle 18b be arranged such that bent axle-balancing device straight line L2 of being connected between two axles roughly with center of gravity G that is connected engine unit 8 and pivot 51 between straight line L1 is parallel in center of gravity-target location.

In addition, the main shaft of the ellipse of the one-level force of inertia of crank mechanism 18 is arranged to and bent axle-balancing device straight line L2 almost parallel, and the one-level force of inertia F2 of balancer mechanism 27 diameter big or small identical with the main shaft of the ellipse of the one-level force of inertia of crank mechanism roughly that be constructed such that just round shape S2.

The elliptical shape of one-level force of inertia by the control crank mechanism, instantaneous center of turn can be arranged in pivot 51 near, the acceleration/accel that makes near caused by translational force pivot 51 acceleration/accel and couple cause is roughly opposite on direction, roughly the same in size.

Such situation (being center of gravity G and the center of gravity between the pivot 51-target location straight line L1 that balancing device axle 27a and bent axle 1 8b are arranged to make the bent axle-balancing device straight line L2 that is connected between two axles to be roughly parallel to be connected engine unit 8) is illustrated as example.But the layout of two axles is not limited thereto.This will be described below.

Control the elliptical shape of the one-level force of inertia that causes by crank mechanism 18 by the counterweight 18a that regulates crank mechanism 18 at least.By regulating position and the weight of counterweight 18a, can be easily the elliptical shape of the one-level force of inertia that caused by crank mechanism 18 be controlled to predetermined elliptical shape S1.

In addition, position and the weight of balancing device counterweight 27b by adjustment device mechanism 27, can control the force of inertia F2 of balancer mechanism 27, making becomes the just round shape S2 with pre-sizing with the formed shape of the track of vector representation on one-period.

In aforesaid way,, also instantaneous center of turn can be arranged near target location (that is, pivot 51) even be not parallel at bent axle-balancing device straight line L2 under the situation of center of gravity-target location straight line L1.

In this way, owing to can suppress near the pivot 51 vibration, just do not need to provide and suppress the link that engine vibration is delivered to body shell etc.Thus, can reduce number of components and realization lightweight.

In addition, mark 77 expression oil pumps, this oil pump is delivered to each lubricated parts of engine body 8a with the lubrication pressure of crankcase 8c bottom, and mark 78 expression cooling water pumps, and each cooling-water chamber of engine body 8a delivered to cooling water pressure by this cooling water pump.In addition, mark 79 expression alternating current generators.

The part of engine unit 8 is supported for around pivot member (engine unit support section) 47 swings, and the structure 47 that wherein pivots is formed on the left and right sides driving engine suspension framework 22,22 of body shell 2.More specifically, the axis a of the pivot 51 of engine unit 8 in being inserted into pivotable member 47 swings vertically, and the part that is positioned at cylinder-bore axis A below of engine unit 8 is directly supported (that is not having link).More specifically, provide following structure.

The lower end of left and right sides driving engine suspension framework 22 is connected by lower portion 22c one.Left and right sides tubular pivot member 47,47 be fixed on left and right sides driving engine suspension framework 22 with following pipe 20 bonded assembly connecting portions near, wherein the axis of left and right sides tubular pivotable member 47,47 is towards vehicle-width direction.Resilient bushing 50,50 inserts in the left and right sides pivotable member 47,47 regularly.Each resilient bushing 50 is configured to rubber component 50c and places between urceolus 50a and the inner core 50b.Pivot 51 inserts among the inner core 50b of the left and right sides regularly.

The anterior 8c ' of diapire that a pair of left and right sides suspension (supported part) 8j, 8j saliently are formed on crankcase 8c forward goes up the below with the cylinder-bore axis A that is positioned at cylinder block 8d.Left and right sides suspension 8j is arranged in the inboard of left and right sides pivot member 47 and is supported rotating by bearing 52,52 by pivot 51.Thus, engine unit 8 passes through pivot 51 and resilient bushing 50 suspensions and support by left and right sides pivot member 47, swinging vertically.

In this way, under engine unit 8 directly was supported on situation on the body shell 2, engine unit 8 supported by resilient bushing 50, made can suppress engine vibration and vibration is delivered to the rider by body shell 2 from ground-surface.

Fuel Tank 30 is arranged in the front end place of body shell 2, and radiator 31 is arranged in the below of Fuel Tank 30.In addition, the storage tank 33 of upward opening is formed from a resin, and is arranged in the rear of Fuel Tank 30.

Vehicle seat 9 comprises main vehicle seat 9a and back vehicle seat 9b, and the rider is sitting on the main vehicle seat 9a, and back vehicle seat 9b and main seat 9a form discretely, and back occupant is sitting on the vehicle seat of back.Backrest 9c is arranged in the rear end of main vehicle seat 9a to support rider's waist.

The front end that main vehicle seat 9 is supported on storage tank 33 is sentenced and can be rotated forward, and back vehicle seat 9b is arranged in the rear end of storage tank 33 rotating backward.

Engine unit 8 is connected to cooling pipe 60, and to be used for that coolant air is incorporated into change speed gear box 8b, wherein variable v-belt drive 17 is contained among the change speed gear box 8b.Cooling pipe 60 comprises having flexible flexible portion, and by engine unit be supported on part on the body shell neighbouring being connected to the band chamber, and flexible portion and the body shell that is fixed to band chamber opposition side.

Particularly, form cooling pipe 60 and roughly extend as the crow flies in a longitudinal direction, and be arranged through the inboard of stretcher (leg rest part) 15 belows and underseal lid 16 with roughly straight horizontal component 20c along lower-left pipe 20.Safeguard that opening 16a is formed on facing on those parts of first air pipe 60 of underseal lid 16, safeguard that opening 16a is covered opening and closing by lid member 76.

Intermediate pipe 66 and flexible tube (flexible portion) 67 that cooling pipe 60 comprises the element 65 that is arranged in stretcher 15 belows, extends back from this element 65, wherein flexible tube 67 has flexibility, and extend back with connection and connection between the inside that intermediate pipe 66 and change speed gear box 8b are provided from intermediate pipe 66, and flexible tube 67 just is positioned to the part on the body shell of being supported near engine unit.

In addition, element 65, intermediate pipe 66 and flexible tube 67 are removably clamped by means of cuff members 68,68,68 respectively.

Change speed gear box 8b comprises enclosure body 8g and housing capping 8h, the left end continuity of enclosure body 8g and crankcase 8c is to extend back, housing capping 8h is releasably attached to the left mating surfaces of enclosure body 8g, and the space that is limited by housing capping 8h and enclosure body 8g provides the band chamber.Herein, driving pulley 17a is formed with a plurality of fin (not shown), and wherein these fins suck coolant air in the band chamber by the torque of driving pulley 17a.

Housing capping 8h is divided into front case 8m and rear housing 8n, and wherein front case 8m is fixed to enclosure body 8g by means of a plurality of bolts 73, and rear housing 8n screw thread similarly is fixed to enclosure body 8g.

Front case 8m and air intake 8p are integrally formed, and air intake 8p extends forward in the mode of tubular, and flexible tube 67 removably clips to air intake 8p by cuff members 68.Thereby air intake 8p defines the band chamber connecting bridge of cooling pipe 60.In addition, the air outlet (not shown) is formed on the rear end of change speed gear box 8b.

The wind that travels that has flowed into left and right sides underseal lid 16 is filtered to be driven belt wheel 17a through intermediate pipe 66 and flexible tube 67 by element 65 and is drawn into change speed gear box 8b from air intake 8p, and the rear end from change speed gear box 8b is discharged to the outside in cooling V band 17c etc. then.

Installation portion 65a is formed on the antetheca of element 65 with to front protrusion, and installation portion 65a is fixed to the support 70a of radiator load-carrying element 70, and radiator load-carrying element 70 is connected to by means of pipe 20,20 down about bolt 71 bridge joints.

Before and after installation portion (body side fixed part) 66a, 66b be respectively formed at the preceding lower edge of intermediate pipe 66 and back upper limb with downwards with to upper process.Preceding installation portion 66a is fixed to support 20f by means of bolt 72, and back installation portion 66b is fixed to support 22f by means of 72, and support 20f is connected to down pipe 20, and support 22f is fixed to driving engine suspension framework 22.

Element 65 is the cylindrical shells with triangular cross section, and is configured to component body 65b and is arranged in the element housings 75 with filtered air.The air intake 75c of element housings 75 and component body 65b are arranged to inboard relative with underseal lid 16, and between have predetermined gap.

Intermediate pipe 66 is vertical elliptical shapes, and is arranged through down pipe 20 following horizontal component 20c and is between the side leg 44a of reception position.

Cooling pipe 60 is roughly straight to extend to the front end of the stretcher 15 that is positioned at vehicle front from air intake 8p on its total length, and wherein air intake 8p defines and with the connecting portion of chamber.

As shown in Figure 8, flexible tube 67 is arranged to, when observing in lateral plan, its line of centers B is near the axis upside of pivot member 47, and the back installation portion 66b on opposite that side with change speed gear box 8b that is positioned at flexible tube 67 of intermediate pipe 66 is fixed to driving engine suspension framework 22.

In this way, flexible tube 67 becomes according to engine unit 8 free bend between the state the when state the during minimum stroke shown in the solid line and the range represented by long and two-short dash line around the stroke of pivot 51 vertical oscillations and in Fig. 9.In the case, because flexible tube 67 is arranged near the pivot 51, it is littler than situation about being arranged at flexible tube 67 away from the position of the pivot of engine unit to follow amount of bow that stroke changes.

According to present embodiment, because engine unit 8 is supported with the axis swing around pivot member 47, wherein, pivot member 47 constitutes the engine unit support section of body shell, engine unit 8 is simply swing vertically only, and thereby can just carry out such structure, i.e. the wherein vertically fluctuation of flexible tube 67 absorptions of cooling pipe 60.Thus, can form a kind of like this flexible tube 67, the intensity of this flexible tube 67 is high and can deal with the suction of external force and band chamber, thereby the amount that can guarantee institute's aspirated air is enough, therefore can improve the cooling effectiveness of V band 17c.

According to present embodiment, because the part of driving engine 8 is supported on the body shell with the axis a swing around the pivot 51 of pivot member 47, wherein, pivot member 47 constitutes the engine unit support section, in other words, the part of driving engine 8 and body shell between do not have to be supported under the situation of link, and this link is used in the unit oscillating driving engine suspension usually, so engine unit 8 can make its center of oscillation substantially can be from axis a out-of-position situation lower swing.Thereby, and compare in the situation of arranging link, can increase the responsibility of throttle gate opening operation, thereby can improve starting the time and the direct sense in when acceleration.Promptly, under link places situation between engine unit and the body shell,, can feel operating lag when carrying out the throttle gate opening operation with when halted state begins to travel, make motor torque in being delivered to the trailing wheel process, at first be connected mechanism and absorb, be delivered to trailing wheel then.As a result, feeling that just vehicle begins to advance after the slow bat, therefore especially when starting, can not obtain enough direct senses than throttle gate opening operation.According to present embodiment, owing to engine unit 8 directly is supported on the body shell 2, and between the two without any bindiny mechanism, so the problems referred to above can be inhibited.

In addition, because engine unit 8 is supported by the resilient bushing 50 that pivot member 47 passes through between the two, be delivered to body side so can suppress engine vibration.In addition, even under the situation of inserting resilient bushing 50, the center of oscillation of engine unit 8 does not have skew substantially.That is, center of oscillation slightly moves along with the deflection of resilient bushing 50, and the amount of movement of this degree is for almost not influence of operating lag, and the operating lag problem place that to be the present invention discuss.

And, according to present embodiment, because balancer mechanism 27 is arranged on the engine unit 8, so can suppress the vibration itself that causes by engine unit 8, thereby can when directly be supported by body shell 2, engine unit 8 suppress engine vibration and be delivered to the rider by body shell 2.

More specifically, be configured to the acceleration/accel that causes by couple (rotational component that this couple is produced by the one-level force of inertia of bent axle 18b balances each other with the force of inertia that rotation produced by balancing device axle 27a and produces) owing to balancer mechanism 27, and by the caused acceleration/accel of translational component of the one-level force of inertia of bent axle 18b near the axis a of pivot 51, roughly opposite each other on direction, and it is roughly the same in size, wherein pivot 51 is those parts by the body shell support of engine unit 8, is delivered to the rider so can suppress engine vibration.

According to present embodiment, because that part suspension that is arranged in cylinder-bore axis A downside of engine unit 8 and being supported on the body shell 2, so compare with the situation that part that is arranged in cylinder-bore axis A top of engine unit is supported, especially the amount with the vertical fluctuation of cooling pipe bonded assembly connecting portion of engine unit 8 can access and reduce.Thus, the vertical fluctuating quantity of flexible tube 67 is reduced, and makes the structure can simplify flexible tube 67, correspondingly increases the intensity of flexible tube 67.

And, since flexible tube 67 be arranged to be positioned at body shell 2 pivot member 47 near, can reduce the vertical fluctuating quantity of flexible tube 67 in view of the above, thereby can further simplify the structure of flexible tube 67, and easily guarantee the intensity of flexible tube 67.

According to present embodiment, because forming, cooling pipe 60 makes the integral body straight line roughly on the longitudinal direction of vehicle that comprises flexible tube 67, so can reduce air resistance to the coolant air that in cooling pipe 60, flows.As a result, can guarantee that the air of q.s sucks in the band chamber, and therefore realize the raising of the responsibility of driving engine.

According to present embodiment and since cooling pipe 60 form from engine unit 8 extend to the front end of the stretcher 15 that the rider that is positioned at front part of vehicle uses with band chamber bonded assembly connecting portion, so can make the volume of cooling pipe 60 become big.Thus, amount of air drawn in the time of can guaranteeing to start and when quickening, thereby the cooling that can improve V band 17c.

In addition, because when flexible tube 67 is arranged to from side elevation, its line of centers B process is as the top of the axis a of the pivot member that is supported on the part on the body shell 47 of engine unit 8, so can reduce the deflection of bellow-shaped flexible tube 67 because of following reason, thereby can correspondingly reduce the resistance to flow in the pipe.

Promptly, stroke about the draft hitch that is used for engine unit 8, shown in Figure 14 (a), be set to usually greater than from stablizing the stroke S2 of motoring condition to the stroke S1 of maximum collapse state (high load capacity input state) to the maximum elongation state from stablizing motoring condition.

Be arranged at flexible tube 67 under the situation above the axis a of engine unit support section, flexible tube 67 makes stroke reach the maximum collapse state along with engine unit 8 and shrinks, and is that the maximum elongation state extends along with engine unit makes stroke.Thereby shown in Figure 14 (b), the deflection of the ripple of flexible tube 67 becomes maximum under the maximum collapse state, becomes minimum under the maximum elongation state.Owing to stablize deflection in the motoring condition near the minimum of deflection, and this minimum is quite little, so the interior resistance to flow of pipe reduces.

On the other hand, be arranged at flexible tube 67 under the situation below the axis a of engine unit support section, flexible tube 67 extends when stroke reaches the maximum collapse state, shrinks when stroke reaches maximum Zhongchang state.Thereby shown in Figure 14 (c), the deflection of the ripple of flexible tube 67 becomes minimum under the maximum collapse state, and is maximum under the maximum elongation state.Deflection approaches maximum deflection under the motoring condition owing to stablize, and this deflection is quite big, so the resistance to flow in the pipe increases.

Claims (10)

1. a motor bike comprises engine unit and body shell, and described engine unit is provided with variable v-belt drive, the described engine unit vertical oscillation but described body shell supports described engine unit,

The part of described engine unit supports on the described body shell and swings with the engine unit support section around described body shell,

Described motor bike also comprises the cooling pipe that is used for coolant air is introduced the band chamber, and the variable v-belt drive of described engine unit is contained in the described band chamber, and

Wherein, described cooling pipe comprises having flexible flexible portion, and through described driving engine be supported on that part on the described body shell neighbouring being connected to described band chamber, and described flexible portion and the described body shell that is fixed to described band chamber opposition side.

2. motor bike according to claim 1, wherein, described engine unit comprises balancer mechanism, described balancer mechanism comprises the balancing device axle, and suppresses the engine vibration that causes owing to the one-level force of inertia.

3. motor bike according to claim 2, wherein, described engine unit comprises the crank mechanism with bent axle,

Comprise rotational component and translational component by the one-level force of inertia that crankshaft revolution produced, described rotational component rotation and its constant magnitude, the direction of described translational component is fixed and its size changes along with the rotation of described bent axle,

That part of on the described body shell of being supported on of described driving engine of acceleration/accel that is caused by couple and the acceleration/accel that caused by the translational component of the one-level force of inertia of described bent axle is on the direction roughly opposite each other, and roughly the same in size, described couple is balanced each other by the rotational component of the one-level force of inertia that rotation produced of described bent axle and the force of inertia that rotation produced by described balancing device axle and produces.

4. motor bike according to claim 1, wherein, described engine unit is supported on the described body shell by elastic component.

5. motor bike according to claim 1, wherein, the supported part of described engine unit is arranged on the crankcase, and described crankcase supports the described bent axle of described engine unit.

6. motor bike according to claim 1, wherein, the part that is positioned at the cylinder-bore axis below of described driving engine directly is supported on the described body shell, and described cylinder-bore axis is arranged as the state that turns forward.

7. motor bike according to claim 1, wherein, described cooling pipe to be arranged in that part between band chamber connecting bridge and the vehicle body fixed part observes from lateral plan be rectilinear form.

8. motor bike according to claim 1, wherein, described flexible portion be positioned at described engine unit be supported on that part on the described body shell near.

9. motor bike according to claim 1, wherein, described cooling pipe extends to rider's leg rest part from connected part, and described rider's leg rest portion is divided the front portion that is positioned at described vehicle with respect to band chamber connecting bridge.

10. motor bike according to claim 1, wherein, when described cooling pipe was arranged to from side elevation, its line of centers was supported on the top of that part on the described body shell through described engine unit.

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