TW200817226A - Motorcycle - Google Patents

Abstract

To provide a motorcycle capable of preventing that worsening in coolability, which is caused by deformation, such as dent, etc., of a cooling duct, and heightening a feeling of directness at the time of starting and acceleration. A part of an engine unit 8 is supported on a body frame 2 to swing about an engine unit support portion 47 of the body frame 2, a cooling duct 60 for introduction of a cooling air into a belt chamber 8b, in which a belt continuously variable transmission 17 of the engine uint 8 is accommodated, and the cooling duct 60 includes a flexible portion 67 having flexibility and passes the vicinity of that portion 47, by which the engine unit 8 is supported on the body frame, to connect to the belt chamber 8b, and an opposite portion 66b of the flexible portion 67 to the belt chamber 8b is fixed to the body frame 2.

Description

200817226 IX. Description of the invention: [Technical field of the invention] Having a belt continuously variable by the skeleton supporting the invention The invention relates to a locomotive comprising an engine unit of a speed transmission device, and a skeleton, To be able to swing vertically. [Prior Art] For example, a scooter type locomotive is generally constructed to support an engine single cymbal by a skeleton to be vertically oscillatable, in which an engine body = a belt continuous variable speed transmission device is manufactured to each other In the body, the engine is 7L early - the back support - the rear wheel 'and the saddle seat is attacked on the shelf. For such locomotives, the only way to prohibit engine vibration from being transmitted to a rider via a skeleton is to support an engine unit on the skeleton via a linkage mechanism (for example, see the patent literature). i). Also in Patent Document 1, cooling air is introduced into the skin f of the engine unit via a cooling pipe to cool a continuous variable speed transmission = a belt. In this case, to absorb the vertical swing of the engine single S, the cooling tube is connected to a belt chamber by a bellows-type flexible portion. [Patent Document 1] JP-A-2003-182674 [Problem to be Solved by the Invention] By the way, in the U shape in which the engine unit is supported by the link mechanism on the skeleton, The swing center of the engine unit is disposed at the joint of the link and the engine unit 7L, and the direction in which the engine unit swings becomes complicated, for example, vertical and vertical. Therefore, it is necessary to configure the flexible portion 121337.doc 200817226 of the cooling tube to have flexibility corresponding to the swinging direction. However, having only flexibility makes the flexible portion susceptible to deformation due to external forces and negative pressure caused by suction in the belt chamber, such as depressions, etc., and there is a reduction in the amount of air drawn and in some cases Also in the case of impairing the cooling capacity of the belt chamber, the configuration in which the engine unit is supported by the link mechanism on the skeleton involves the following problem: even when the opening operation of the throttle valve is implemented, it is easy to appear-response Hysteresis, in which acceleration is always started after one beat, especially at start-up and acceleration, and thus lacks a direct sensation during start-up and acceleration. The present invention has been conceived in the above-described conventional circumstances, and an object thereof is to provide a locomotive capable of preventing deterioration of cooling capacity due to deformation (for example, depression, etc.) of a cooling pipe and enhancing starting and acceleration. Direct reduction

feel. The locomotive of the present invention is a locomotive comprising an engine unit having a belt continuous t: speed transmission device and a skeleton supporting the engine unit such that the engine unit can be vertically oscillated, and one of the engine units is partially supported The locomotive further includes a cooling tube for introducing cooling air into a belt chamber, the belt interior continuously accommodating the belt unit a variable speed transmission, and wherein the cooling tube includes a flexible portion having flexibility and is adjacent to a portion of the engine unit supported on the frame to be coupled to the belt chamber, and the flexible portion is disposed opposite A portion of the belt chamber is fixed to the skeleton. 121337.doc 200817226 Here, in the present invention, the one of the skeletons is supported by the skeleton, and one of the skeletons is supported by the support member of the engine unit, and is pivoted. The connecting rod is usually supported by the (4) knife on the skeleton without a connection between them. Therefore, the bow engine is oscillating and the engine unit of the unit swinging engine suspension unit frame of the locomotive is oscillated without causing The swing center from the bone will be ... roughly shifted " meaning ^ roughly - shift. In addition, in this case, "not the same situation, the elastic set or the like to support

移位 The deflection of the set. θ′··substantially shifting includes the same as the elastic lining of the same 'in the towel of the present invention' - the crankshaft r Ximei / a building on the skeleton " meaning except the shape, it also includes support The case of a cylinder block or a cylinder head or the like. [Effects of the Invention] In the locomotive according to the present invention, since the engine unit is oscillated centering on the support portion of the engine unit of a moon frame, the engine swings only vertically and thus one of them The flexible portion of the cooling tube can absorb only the configuration of vertical fluctuation. Thereby, the flexible portion knife can be formed by a flexible portion having a high strength corresponding to the external force and the suction force in the belt chamber, and thus it is possible to ensure that a sufficient amount of air is taken, thereby enhancing the cooling of the belt chamber. . According to the present invention, since the engine unit is supported to swing centering on the engine unit supporting portion of the skeleton (in other words, without using a link for supporting therebetween), the responsiveness to the throttle valve opening operation can be enhanced' Therefore, the direct feeling at the time of starting and accelerating can be improved. That is, in the case where such a link is inserted between the engine unit and the bobbin, when a flow opening operation is performed 121337.doc 200817226 to start the first time during the transmission to the rear wheel, when 4= travels Because the engine twists the rear wheel, it feels that there is a "response ^ dry absorption and then is transmitted to the section behind the fourth (four) open operation - (four) shoot to = will not feel that the vehicle can not be obtained when the vehicle is wide - full direct feeling. According to the present invention, this problem can be suppressed by inserting any link. Since it is not described in the following, an embodiment of the present invention will be described with reference to the accompanying drawings. Figures I through U illustrate a view of a locomotive in accordance with an embodiment of the present invention. Further, before and after the reference to the description of the embodiment, and the left and right directions are referred to before and after, and to the right, as seen on the state of the seat. In the drawings, reference numeral i denotes a pedal type locomotive. Locomotive 1 pack

丄: a unit swing type bow with a belt continuous variable speed transmission 17 is 7; 8; and a high-strength steel tube (Underbone) type skeleton 2, which supports the engine unit 8 for the same vertical swing; A seat 9 is mounted on the skeleton 2. The locomotive 1 comprises: a front fork 6 supported by a head pipe 3 positioned at the front end of the skeleton 2 to be steered left and right; and a steering handle 5 disposed at an upper end of the front fork 6 and disposed on the front side One of the lower ends of the forks 6; a rear wheel 7 disposed at a rear end of the engine unit 8; and a rear pad 10 interposed between the engine unit 8 and the bobbin 2. The same locomotive 1 comprises: a front cover 11 covering the front of the head pipe 3; a sufficient 7 P i plate 12' covering the back of the head pipe 3 and the front of the rider's legs; - 121337.doc -10- 200817226 side A cover 13 covering the lower periphery of the seat 9; a footrest 15 disposed at the lower edge of the foot 4 panel 12, and a lower cover 16' laterally covering the lower portion of the foot pedal is. The foot board 15 is disposed on the upper surface of the bracket 29 fixed to the frame 2 of the frame 2. The skeleton 2 includes: left and right lower tubes 20, 20 which are outwardly divided from the head tube 3 in a vehicle width direction, extend downward and extend substantially horizontally rearward from the lower end thereof, left and right seat rails 21, 21, which extends rearward from the middle portion of the left and right lower tubes 2〇, 2〇 and upwards diagonally, and extends substantially horizontally rearward from the rear end thereof; and left and right engine suspensions 22, 22 from the left And the rear end of the lower right tube 20 extends vertically and is connected to the seat holder 21 at its upper end. Similarly, the skeleton 2 comprises: left and right upper tubes 24, 24 extending substantially rearwardly from the head tube 3 and joined to the seat holder 21 at its rear end; left and right seat brackets 25, 25 connected to The left and right engine suspensions 22 are interspersed with the seat; and a cross member 23 is coupled between the portions of the left and right seat supports 21 and the engine suspension 22 in the vehicle width direction. An engine block 8a and a gearbox 8b are integrally joined to the engine unit 8, and a belt continuously variable transmission 17 is housed in the gearbox 8b. An air filter 36 is fixed to the upper wall surface of the transmission case 8b. The engine body 8a is a water-cooled type of four-hearted heart & Jing, Gan " & 4

A crank mechanism 18 is housed in the axle housing 8c, and the crank mechanism 18 includes a crankshaft 18b that is disposed substantially horizontally in the width direction. The continuously variable transmission 17 disposed to extend to the v-belt includes: 121337.doc 200817226 The drive pulley Ha at the left end of the crankshaft 18b in the transmission case 8b; the driven pulley 17b disposed at the rear end of the transmission case 8b; and a roll The V-belt 17c is wound around the drive pulley and the driven pulley 17b. Similarly, a spindle 17d (to which the rotation of the driven pulley 17b is transmitted) and a drive shaft 17e are disposed in the transmission case 8b, and the rear wheel 7 is mounted to the drive shaft 17e. The V-belt continuous variable speed transmission 1 7 includes A winding diameter varying mechanism 26 that uses a controller (not shown) to variably control the drive pulley between the lower position and the top position by means of a variablely operated rider accelerator based on engine speed, vehicle speed or the like. One of the 17a belt winding diameters (see Figure 4). The winding diameter changing mechanism 26 includes: a driving motor 26a; a reciprocating driving gear 26b that axially moves one of the moving side pulleys (not shown) of the driving pulley 17b to change a winding diameter; and a reduction gear set 26〇, which transmits the rotation of the drive motor 26a to the reciprocating drive gear 26b. As shown in Figures 5 and 6, the engine unit 8 includes a balancer mechanism 27 that includes a balancer shaft 27a and suppresses engine swing due to one-time inertial force. The balancer mechanism 27 is configured to rotate at the same rotational speed as the rotational speed of the crankshaft 18b of the crank mechanism 18 and in a direction opposite to the rotational speed of the crankshaft 18b. The balancer mechanism 27 includes a balancer shaft 27a disposed above the crankshaft 18b in the crankcase 8c and disposed parallel to the crankshaft i8b; a balancer counterweight 27b' integral with the balancer shaft 27a to be perpendicular to the balancer The shaft extends. The balancer weight 27b extends to be positioned between the left and right counterweights 121337.doc -12- 200817226 18a, 18a of the crankshaft 18b. The left and right ends of the balancer shaft 27a are supported on the crankcase 8c by bearings 28 and 28 therebetween, and a balancer gear 27c is coupled to the balance shaft 27a on the inner side of the right bearing 28 with a cushioning member 27d therebetween. The balancer gear 27c is meshed with a drive gear 18b that is coupled to the crankshaft i8b. Herein, the first inertial force generated by the rotation of the crank mechanism 18 8 Han 18b includes: a rotational component whose constant value is constant and rotated; and a translational amount 'which is fixed in the direction and The rotation of the crankshaft l8b varies in magnitude. Similarly, the balancer mechanism 27 is configured to cause an acceleration caused by a moment force (which is generated by one of the inertial forces generated by the rotation of the balancer shaft 27a by the one-time inertial force of the crankshaft 18b). And the acceleration caused by one of the one-time inertial forces of the crankshaft 1 is substantially opposite in direction to each other and is substantially the same in magnitude around a pivot 51 (which supports a portion of the engine unit 8). In order to make the two accelerations substantially opposite in magnitude in the direction, as shown in FIG. 12, an instantaneous center of rotation is provided on the pivot 51. The instantaneous center is not generated by the crank mechanism. 8 times the inertial force F丨 and the vibration caused by the inertial force F2 of the balance mechanism 27. The method of arranging the instantaneous rotation center on the pivot 51 is explained below. As shown in FIG. 13, the shape of the first inertial force F1 of the crank mechanism 18 drawn in one cycle by the vector representation is a predetermined elliptical shape S1. On the other hand, the balancer mechanism 27 is once. The inertial force F2 plots a vector representation with a standard circular shape 52. The balancer shaft 27a and the crankshaft 18b 121337.doc -13- 200817226 are configured such that a crank-balancer line L2 connected between the two shafts is substantially parallel to a center of gravity G and a pivot connected to the engine unit 8 The center of gravity between 5丨 - the target position line L1. Similarly, the major axis of the elliptical force of the primary inertial force of the crank mechanism 18 is configured to be substantially parallel to the crank-balancer line L2, and the primary inertial force F2 of the balancer mechanism 27 is configured to have a diameter of the standard circular shape S2. The magnitude is approximately the same as the magnitude of the major axis of the ellipse of the primary inertial force of the crank mechanism. An instantaneous center of rotation can be disposed near the pivot 51 by controlling the elliptical shape of the secondary inertial force of the crank mechanism such that the acceleration caused by a translational force and the acceleration caused by the even force are substantially opposite in direction. The magnitudes in the vicinity of the frame axis 5 1 are substantially the same. As an example, an explanation has been given for the case where the balancer shaft 27a and the crankshaft 18b are configured such that the crankshaft-balancer line L2 connected between the two shafts is substantially parallel to the center of gravity connected to the engine unit 8. The center of gravity between g and the pivot axis - the target position is 绿吉绿 T!. Pull y straight green L1 However, the configuration of the two axes is not limited to this. This will be explained below. The shape of the first inertial force caused by the crank mechanism 18 and the elliptical shape of the knife are controlled by at least adjusting the dry weight hammer 18a of the crank mechanism and the mechanism s μ 竿 mechanism 18. By adjusting the counterweight 18a for the position and the weight, the elliptical shape (four) of the upper inertial force caused by the crank mechanism 18 can be easily made into the predetermined elliptical shape si. Similarly, by adjusting the balancer weight 27b' of the balancer mechanism 27 for the position and the weight i, the balance of the hammer 1 and the inertia force F2 of the mechanism 27 can be controlled so that the vector representation is in one cycle. A patterned shape of the painted squash becomes a standard circular shape S2 having a predetermined magnitude. 121337.doc •14- 200817226 The manner described above can be at a target position even in the case where the crankshaft-balancer line £2 is not parallel to the center of gravity_target position line L1 (ie, at the pivot 5 1 A momentary center of rotation is placed in the vicinity). In this way, since the vibration in the vicinity of the pivot 51 can be suppressed, it is not necessary to provide a link that prohibits the engine vibration from being transmitted to the skeleton or the like, whereby the number of parts can be reduced and the weight can be reduced.

Further, reference numeral 77 denotes an oil pump which feeds the lubricating oil pressure at the bottom of the crankcase 8c to each of the lubricated portions of the engine body 8a, and reference numeral 78 denotes a cooling water pump which will be a cooling water. The pressure is fed to each of the cooling water jackets of the engine body 8a. Similarly, the reference numeral designates that a portion of an alternator 0 engine unit 8 is supported to swing with a pivot member (engine unit support portion) 47 formed on the left and right engine suspensions 22, 22 of the bobbin 2 as a center. More specifically, the engine unit 8 is vertically oscillated centering on the axis a of the cymbal 51 which is inserted into the pivot member 47, and its yoke under the cylinder axis a is forked to the direct support, that is, There is no link. More specifically, the following configuration will be provided. The lower ends of the left and right engine suspensions 22 are integrally connected by the lower side portion 22c. The left and right cylindrical pivot members 47 47, which are arranged with their axes pointing in the width direction of the vehicle, are fixed near the connection of the left and right engine suspensions 22 to the lower tubes. The elastic bushings 50, 5〇 are inserted in a fixed manner into the left and right pivot members 4, and the respective elastic bushings 50 are formed to insert a rubber member 5〇c into an outer cylinder 50a and an inner cylinder. Between 5〇b. The pivot 51 is inserted into the left and right cylinders 50b in a fixed manner. 121337.doc 200817226 A pair of left and right suspension units (via the support portion) 8′′, (5) projecting forwardly on the bottom wall front surface 8c of one of the crankcases 8c to be positioned below the cylinder axis A of the cylinder block 8d. The left and right suspension units (5) are disposed inside the left and right pivot members and are rotatably supported by the pivots 51 via bearings 52, 52. Thereby, the engine unit 8 is supported and suspended by the left and right pivot members 经由 via the pivot shaft 51 and the elastic bushing 50 to be vertically swingable.以此 ϋ In this way, in the case where the engine unit 8 is directly supported on the skeleton 2, the engine unit 8 is supported via the elastic bushing 5〇 so that engine vibration and vibration from the road surface can be prohibited from being transmitted to the ride via the skeleton 2 The car. The magazine 30 is disposed at the front end of the bobbin 2, and a radiator 31 is disposed below the fuel tank 30. Similarly, an upwardly open storage tank 3 3 made of resin is disposed behind the fuel tank 30. . The upper part includes a main seat seat, a rider rides on the main seat, and a rear seat 9b which is formed independently of the main seat and rides on a rear companion. A backrest 9c is disposed at the rear end of the main seat 9a to support a rider's waist. The main seat 9a is supported at the front end of the storage box 33 to be rotatable forward, and the rear seat 9b is disposed at the rear end of the storage box 33 to be rotatable rearward. Connected to a system for introducing cooling air into the transmission case 8b. The transmission case houses a belt continuously variable transmission second engine" including a flexible portion having flexibility and being supported by a portion of the engine hand And the portion to which the belt-flexible portion is placed in the belt chamber is fixed to the bone, and specifically the 'cooling tube 6' is formed to be along the lower left tube in the longitudinal direction 121337.doc -16 - 200817226 20 One of the substantially straight horizontal portions 20c extends substantially linearly, passes under the footrest (foot portion) 15 and inside the bottom cover 16, and is disposed so that -U is avoided. The maintenance opening 16a is formed in the bottom cover 16 The portion facing the first air tube 60, the cover member 76 covers the maintenance opening! 6a can be opened and closed. The cooling tube 60 includes an element 65 disposed under the footrest • 5 • a • the component 65 extends rearward The intermediate tube 66; and a flexible tube (flexible portion *7* having flexibility and extending rearward from the intermediate tube 66 to provide connection and communication between the intermediate tube 66 and the interior of the transmission C-box, and the flexible tube 67 is positioned just near the support Similarly, the component 65, the intermediate tube 66 and the flexible tube 67 are detachably held by the strip members 68, 68, 68, respectively. The transmission jaw 8b includes an adjacent crankcase 8c. The left end is a rearwardly extending box body 8g, and a cover 8h detachably mounted to the left side of the box, and a space defined by the box cover 8h and the box body 8g provides a belt chamber. The drive pulley 17a is formed with a plurality of blades, and the torque of the drive pulleys 17 & 1 causes the blades to break a cooling air into the belt chamber. The cover 8h is divided into a box 8m by means of a plurality of bolts to be fixed to the box. And the box 8n is also bolted to the box 8h in a fixed manner. The front box 8m and an air inlet 8p (which extends forward in a cylindrical manner)

After the end.

121337.doc -17- 200817226 is thus discharged from the rear end of the transmission box 8b to the outside by the driving pulley 17a, and a bracket 65a is formed on the wall of the member 65# to extend upward, and the bracket 05a is assisted by 4 The & 71 is fixed to the bracket 7〇a of the radiator support member 70 and the bracket 7〇a is connected to bridge the left and right lower tubes 20, 20. ^ Scythe) 66a, 66b are formed in the middle

"The lower edge of the moon and the rear upper edge of the moon extend downward and upward. The front bracket 66a is fixed to a bracket 20f (which is connected to the lower tube 20) by a bolt 72, and the rear bracket 66b is screwed 72 is fixed to a bracket 22f (which is fixed to the engine suspension 22). The element 65 is a cylinder having a polygonal cross section and is configured to dispose a 70 piece body 65b in a component box 75 to filter air. The air inlet 75c and thus the element body 65b are disposed to face the inner side of the bottom cover 16 with a predetermined gap therebetween. (The intermediate tube 66 and the flexible tube 67, the port 8p is inserted into the transmission case 8b while cooling the V-belt The intermediate tube 66 of 1 7C or the like has a longitudinal elliptical shape and is configured to pass between the horizontal portion 20c below the lower tube 2b and the side frame 44a present in a storage position. The cooling tube 60 is substantially straight over its entire length. From the air inlet 8p (the connection of the boundary to the belt chamber) extends to the front end of the footboard 15 positioned in front of a vehicle. As shown in Figure 8, the flexible tube 67 is configured such that its centerline b is sideways As seen from time to time on and near the axis a of the pivot member 47 And the bracket 66b is fixed to the engine suspension 22 after the intermediate tube 66 on the opposite side of the flexible tube 67 and the transmission case 8b. 121337.doc -18- 200817226 In this way, the flexible tube 67 becomes available in the engine The state of the vertical oscillating stroke of the unit 8 about the pivot axis 5i is free to bend between the state at the minimum stroke (indicated by the solid line in Fig. 9) and the state at the maximum stroke (indicated by the double-dotted line). In this case, Since the flexible tube 67 is disposed near the pivot 51, the amount of bending accompanying the stroke change is smaller than the amount of bending in the case where the flexible tube 67 is disposed at a position away from the pivot of the engine unit.

According to this embodiment, since the engine unit 8 is supported so as to swing centering on the shaft & the pivot member 47 (which constitutes the engine unit supporting portion of the skeleton), the engine unit 8 swings only vertically and thus Wherein the flexible portion of the cooling tube absorbs only the configuration of vertical fluctuation. Thereby, the flexible portion can be formed by a flexible portion which is high enough to correspond to the external force and the suction force in the belt chamber, and thus can ensure that a sufficient amount of air is taken, thereby enhancing the cooling of the V-belt 17c. effectiveness. According to this embodiment, a portion of the engine unit 8 is pivoted on the skeleton so as to be centered on the axis a of the thumb shaft 51 of the pivot member 47 (which constitutes the engine unit supporting portion), in other words, In the meantime, the - link is not used to support 'the link is usually used in the unit swing type engine suspension unit, so the engine unit 8 can swing without causing its swing center to be substantially moved from the axis a. - In the case of the linkage mechanism, the oscillating stomach test of the - throttle opening operation can be increased, thus achieving a direct impression during starting and acceleration: that is, 'inserting in the linkage mechanism - the engine unit and the skeleton Between the implementation of the throttle valve opening operation to start from a stop-like travel will feel the existence - the shore delay, 3 丨 + τ stop ^ ^ ^ JL ^ ^, ~ engine torque transmitted to a The rear wheel is absorbed by the money rod mechanism and then transmitted to the rear wheel. Since 121337.doc -19- 200817226 this 'appears the following feelings··the vehicle falls # is open at n, day h Ρ 1 open operation - a beat. Β ^ At this +, I received a full direct salty meal. According to this embodiment, since the engine-wamen is directly supported on the skeleton 2 without any link mechanism interposed therebetween, the above-mentioned problems are suppressed. Similarly, since the engine unit 亓 s οσ is 8 The pivot member 47 is supported, and the right elastic bushing 50 is therebetween, so that the indexing of the engine can be suppressed, and the engine can be transmitted to the vehicle body side. In addition, even when the elastic bushing 5 is inserted, The opening/middle engine of the month is 兀 兀

No shifting, i.e., the 'swing center corresponds to the flexing of the elastic bushing 50.' However, the movement of this magnitude has little effect on the response delay discussed by the present invention as a problem. Further, according to this embodiment, since the balancer mechanism 27 is provided on the engine unit-8, it is possible to suppress the vibration caused by the engine unit 8 when the engine unit 8 is directly supported by the skeleton 2, and thus it is possible to When the skeleton 2 directly supports the engine unit 8, the engine vibration is suppressed from being transmitted via the skeleton 2 to a rider. More specifically, since the balancer mechanism 27 is configured to be caused by an inertial force generated by a moment force (which is generated by the rotation of the rotational force component of the first inertial force of the curve (10) balance rotation of the balancer shaft 27a) The acceleration and the acceleration caused by the first inertia force of the crankshaft 1 8 b, the acceleration caused by the dry movement of the knife are substantially in the direction of each other and around the pivot 51 (which is supported by the skeleton) The axis a of one of the upper engine units 8 is substantially the same in magnitude, so that engine vibration can be suppressed from being transmitted to a rider. According to this embodiment, since the portion of the engine unit 8 disposed under the cylinder axis A is suspended from and supported by the bobbin 2, the portion of the engine unit that is disposed above the cylinder axis A is supported by 121337.doc -20-200817226. Compared to 'can reduce (in particular) the amount of vertical fluctuation of the connection of the engine unit 8 to the cooling tube. Therefore, the amount of vertical fluctuation of the flexible tube 67 is reduced, so that the flexible tube 67 can be structurally simplified and the strength thereof can be correspondingly increased. In addition, since the flexible tube 67 is configured to be positioned near the pivot member 47 of the bobbin 2, the amount of vertical fluctuation of the flexible tube 67 can be reduced accordingly, thereby enabling the flexible tube 67 to be further simplified in structure and Its strength is easily guaranteed. According to this embodiment, since the cooling pipe 60 is formed such that the entirety including the flexible pipe 67 is substantially straight in the longitudinal direction of the vehicle, the air resistance to the cooling air flowing into the cooling pipe 60 can be reduced. Therefore, it is ensured that a sufficient amount of air is drawn into the belt chamber, and thus an improvement in engine responsiveness is achieved. According to this embodiment, since the cooling tube 60 is formed to extend from the connection of the engine unit 8 to the belt chamber to the front end of a rider's footrest 15 positioned in front of a vehicle, the cooling tube 60 can be made in volume It is bigger. Thereby, it is possible to ensure that a large amount of air is taken up during starting and acceleration, and thus the cooling property of the V-belt 17c can be enhanced. Also, since the flexible tube 67 is configured such that the center line b passes over the axis a of the pivot member 〇 which is the portion of the engine unit 8 supported on the skeleton as seen from the side, the bellows shape can be reduced The flexible tube 67 is capable of correspondingly reducing the flow resistance in the tube for the following reasons. That is, as regards the stroke of the suspension device of the engine unit 8, as shown in Fig. 14 (4), the stroke s 1 of the self-stabilized traveling state to the maximum contraction state (high load input complaint) is generally greater than one self-stabilizing. The marching bear i 121337.doc -21 - 200817226 Stroke S2 of the maximum extended state. The flexible tube 67 is disposed in the shape of the engine unit, and the flexible tube 67 is contracted with the shaft of the engine unit 8° Ρ 上面 上面 至 至 至 至 至 至 且 且 且 且 且 且 且 且 且 且 且 且 且 且 且The γ-like shape of the 仃-- extends to the maximum stretch from the stroke. Therefore, as shown in Fig. 14(b), the deflection of the bellows of the birth tube 67 becomes maximum when the table is in a large contraction state, and becomes the maximum extension state. small. Since the deflection in the steady state of travel is close to the minimum amount of deflection and the enthalpy is so small, the flow resistance in the tube can be reduced. On the other hand, 'in the case where the flexible tube 67 is disposed under the axis a, the underside of the shaft a of the support portion of the engine, the flexible tube 67 extends at the stroke of the maximum contraction state and is in the Shrinks during the stroke of the maximum stretch state. Therefore, as shown in (10) and (4), the amount of deflection of the bellows of the flexible tube 67 becomes minimum at the time of maximum contraction and becomes maximum at the maximum extension state. Due to the stable behavior: the shape 1, the Ninth's deflection is close to the maximum deflection and is so large, so the flow resistance in the tube is increased. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view showing a locomotive according to an embodiment of the present invention. Figure 2 is a side view showing one of the skeletons of the locomotive. Figure 3 is a plan view showing the skeleton. . . Figure 4 is a side elevational view of an engine unit supported on the frame for vertical swinging. Figure 5 is a side elevational view of one of the balancer mechanisms of the engine unit. Figure 6 is a cross-sectional view showing the balancer mechanism. Figure 7 is a side view showing the engine unit. 121337.doc -22- 200817226, a side view of the cold tube of the _ 叇 至 至 ( ( m m m ^ m ^ ^. Figure 9 is a side view of a flexible tube showing one of the cooling tubes. Fig. 10 is a cross-sectional view showing the cooling pipe (a cross-sectional view taken along line χ χ in Fig. 8). Figure 11 is a cross-sectional view showing the cooling tube (a cross-sectional view taken along line χι·χι in Figure 8). Figure U is a plan view showing the cross-face of the engine unit supporting portion of one of the engines according to this embodiment. Figure 13 is a schematic view showing the construction of a balancer mechanism of an engine according to the present invention. Figure 14 (aHc) is a schematic diagram showing the functions and effects obtained in the tube configuration of the engine according to this embodiment. [Main component symbol description] 1 Locomotive 2 Skeleton 3 Head tube 4 Front wheel 5 Steering handle 6 Front fork 7 Rear wheel 8 Engine unit 8a Engine body 8b Transmission case 8c Crankcase 121337.doc -23- 200817226 Ο ί. 8cf Bottom wall front 8d cylinder block 8e cylinder head 8f head cover 8g case 8h cover 8j suspension unit 8m front case 8n rear case 8p belt room connection part 9 saddle seat 9a main seat 9b rear seat 10 rear pad 11 front cover 12 foot Guard plate 13 Side cover 15 Foot pedal 16 Lower cover 16a Maintenance opening 17 V-belt continuous variable speed transmission 17a Drive pulley 17b Drive pulley 17c V-belt 121337.doc .24- 200817226 Ο ϋ 17d Spindle 17e Drive shaft 18 Crankshaft mechanism 18a counterweight 18b crankshaft 18b, [drive gear 20 lower tube 20c lower horizontal portion 20f bracket 21 seat handle 22 engine suspension 22c lower side portion 22f bracket 23 head tube 24 upper tube 25 seat bracket 26 winding Diameter change mechanism 26a Drive motor 26b Reciprocating drive gear 26c Reduction gear set 27 Balancer mechanism 27a Balancer shaft 27b Balancer counterweight 27 c balancer gear 121337.doc -25- 200817226

ί / 27d cushioning member 28 bearing 29 foot bracket 30 fuel tank 31 radiator 33 storage tank 36 air filter 44a side frame 47 pivot member 50 elastic bushing 50a outer cylinder 50b inner cylinder 50c rubber member 51 pivot 52 standard circle Shape 60 Cooling tube 65 Element 65a Bracket 65b Bracket 66 Intermediate tube 66a Bracket 66b Bracket 67 Flexible tube 68 Strip member 121337.doc -26- 200817226 70 Radiator support member 70a Bracket 71 Bolt 72 Bolt 73 Bolt 75 Component box 75c Air inlet 76 Cover member 77 Oil pump 78 Cooling water pump 79 Alternator 121337.doc -27-

Claims (1)

200817226 X. Patent application scope: 1. A locomotive comprising an engine unit having a belt continuous variable speed transmission and a skeleton supporting the engine unit such that the engine unit can swing vertically, one part of the engine unit Supported on the skeleton and oscillated centering on an engine unit supporting portion of the skeleton, the locomotive further comprising a cooling tube for introducing a cooling air into a belt chamber, the belt continuous variable speed transmission of the engine unit Is housed in the belt chamber, and wherein the cooling tube includes a flexible portion having flexibility and is adjacent to a portion of the engine unit supported on the skeleton to be coupled to the belt chamber, and one of the flexible portions The portion that is placed in the belt chamber is fixed to the skeleton. 2. The locomotive of claim 1, wherein the engine unit includes a balancer mechanism that includes a balancer shaft and suppresses engine vibration due to a primary inertial force. 3. The locomotive of claim 2, wherein the engine unit includes a crank mechanism including a crankshaft, and a first inertial force generated by the rotation of the crankshaft includes: a rotational component that is constant in magnitude and rotated; a translation component that is fixed in direction and varies in magnitude with the rotation of the crankshaft, and one of the inertia forces generated by the rotation of the crankshaft is balanced by the rotation of the balancer shaft. The acceleration caused by the moment of inertia and the translation of one of the first moments of inertia of the crankshaft 121337.doc 200817226 The acceleration caused by the knife is substantially opposite in direction and supported by the engine unit The portions of the skeleton are approximately the same in magnitude. 4. The locomotive of claim 1, wherein the engine unit is supported on the skeleton by an elastic member. 5. The locomotive of claim 1 wherein one of the supported engine units is mounted on a crankcase that supports the crankshaft of the engine unit. For example, in the locomotive of claim 1, wherein one of the engine units is directly supported by the locomotive at a portion of the cylinder shaft with a forward slanted heart, such as a locomotive of the item i, wherein the side view is At least the portion of the cooling tube is placed in a straight line shape between a belt chamber connecting portion and a vehicle body fixing portion.丨 丨:: The locomotive of item 1, wherein the flexible portion is positioned adjacent to a portion of the frame that is supported by the single 7°. 9 · 如ό青求项1 $播_ ϋ , locomotive, wherein the cooling pipe extends from the belt chamber connecting portion to a 黯 疋 疋 疋 — 、 、 、 、 、 π π π π π π π π π Positioned relative to the belt to the connecting portion toward a front portion of the vehicle. 10. If the fish of the request item i is dry, as in the side view, the cooling pipe is configured as an eight-line, I borrowed to support the engine unit above the scalpel on the skeleton. 0 121337.doc