KR20070014954A - Fuel supply structure of moveable three wheeled motor vehicle - Google Patents

Abstract

A fuel supply structure of a movable three wheeled motor vehicle is provided to absorb twist caused due to the vertical swing movement and horizontal roll movement of a vehicle body. A movable three wheeled motor vehicle comprises a swing unit(17) constituted by an engine(76) and a non-stage transmission. A fuel pump(41) is arranged in a fuel tank(38) which is mounted on a vehicle body so as to supply fuel to the engine. A fuel injection valve(91) mounted on the engine is connected to the fuel pump through a fuel supply pipe(92) including a flexible pipe made of a resin material. The fuel supply pipe contains thermoplastic resin material, and has an outer diameter of 7mm or smaller.

Description

FUEL SUPPLY STRUCTURE OF MOVEABLE THREE WHEELED MOTOR VEHICLE}

1 is a side view of a rocking tricycle according to the present invention.

2 is a side view showing the vehicle body rear portion of the rocking tricycle according to the present invention;

Figure 3 is a plan view of the main part of the rocking tricycle according to the present invention.

4 is a side view of an essential part of a rocking tricycle showing a fuel supply pipe according to the present invention;

5 is an explanatory diagram of a fuel supply pipe according to the present invention;

6 is a graph showing the relationship between the flatness ratio and the required bending radius R of the fuel supply pipe according to the present invention.

7 is an explanatory diagram for explaining a flatness ratio and a required bending radius R of a fuel supply pipe according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: rocking tricycle

17: swing unit (power unit)

38: fuel tank

41: fuel pump

76: engine

77: continuously variable transmission

91: fuel injection valve

92: fuel supply pipe

209, 210: support member (clamp).

This invention relates to the improvement of the fuel supply structure of a rocking tricycle.

As a fuel supply structure of a conventional rocking tricycle, it is known that a fuel pipe is composed of a plurality of members and connected to a fuel tank and a power unit (see Patent Document 1, for example).

Moreover, what connected the fuel pump in a fuel tank, and the injector of the engine unit side with the high pressure rubber hose is known (for example, refer patent document 2).

[Patent Document 1] Utility Model Publication No. 57-122492

[Patent Document 2] Patent Publication No. 2003-176762

FIG. 1 of patent document 1 describes that the vehicle body rear part 15 is swingably and rollably attached to the whole vehicle body 2 through the link 12, the swing shaft 11, and the shaft 14. As shown in FIG.

In addition, in FIG. 2 of patent document 1, the connection pipe 21 is connected to the fuel tank 19 installed in the whole vehicle body through the cock 20, and the joint 22 attached to the frame to this connection pipe 21 is carried out. One end of the first flexible connector 23 is connected via the second connector, and one end of the intermediate connector 24 made of a metal pipe is connected to the other end of the first flexible connector 23. One end of the second flexible connector 25 is connected to the other end of the 24, and one end of the guide connector 26 fixed to the vehicle body rear part 15 is connected to the other end of the second flexible connector 25. The other end of this guide connecting pipe 26 is connected to the power unit 16 side vaporizer 27 via the rubber tube 28, and it is described.

The first flexibility positioned between the joint 22 on the whole body 2 side and the guide connecting pipe 26 on the rear body 15 side when the body rear portion 15 swings up and down with respect to the whole body 2. The connecting pipe 23, the intermediate connecting pipe 24, and the second flexible connecting pipe 25 are vertically swept. In addition, when the vehicle body rear part 15 rolls from side to side with respect to all the vehicle bodies 2, the first flexible connector 23, the intermediate connector 24, and the second flexible connector 25 are twisted.

In FIG. 2 and FIG. 7 of patent document 2, a fuel pump is installed in the fuel tank 10, the engine unit 19 is attached to the vehicle body frame 34 so that a swing is possible, and the injector 50 is attached to the engine unit 19. FIG. And the fuel pump and the injector 50 are connected by a high pressure rubber fuel hose 62, and the middle of the fuel hose 62 is supported by the steer 63 attached to the body frame 34. It is described.

The fuel pipe from the fuel tank 19 to the vaporizer 27 of Patent Document 1 does not particularly have a large pressure of the fuel. For example, a fuel pump is provided in the fuel tank, and a fuel injection valve is provided in place of the carburetor on the engine side. In one case, it is preferable that the fuel pipe connecting these fuel pumps and the fuel injection valves endures the large pressure of the fuel and absorbs the vertical swing motion of the vehicle body rear part 15, the bending due to the left and right roll motions, and the twist.

In the case of the oscillating tricycle in Patent Document 2, since the vibrations in the left and right roll directions are added to the swing of the upper and lower sides, the molding hose made of rubber for high pressure has achieved both the vibration of the upper and lower sides and the required fuel supply amount. It was difficult to do.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel pipe for a rocking tricycle having high pressure resistance while absorbing warpage and twist due to vertical swing motion and left and right roll motion of a vehicle body.

The invention according to claim 1, wherein in a swinging tricycle including a swing unit comprising an engine and a continuously variable transmission, a fuel pump is provided in a fuel tank disposed on the vehicle body side to supply fuel to the engine, and the fuel pump is provided on the engine side. The fuel injection valve provided in this connection was connected via the fuel supply pipe containing the resin pipe which can be elastically deformed.

By using the fuel supply pipe made of resin, the fuel pipe connecting the fuel pump and the fuel injection valve ensures high pressure resistance and is elastically deformable, so that in addition to the swing movement of the swing unit on the vehicle body side, even if the roll movement is made As the fuel supply pipe serving as the pipe is bent, the fuel supply pipe for the swinging tricycle including the fuel pump and the fuel injection valve can be realized.

The invention according to claim 2 is characterized in that the fuel supply pipe is made of a thermoplastic resin material, and its outer diameter is formed up to 7 mm.

Since the fuel supply pipe is a thermoplastic resin material, it is possible to produce a smaller thickness and a smaller inner diameter than the rubbery high pressure fuel supply pipe which needs to knit and insert a high-pressure fiber material or the like, and the outer diameter can be made small. Thereby, the fuel supply amount and sufficient elasticity which are required for a rocking tricycle can be ensured.

The invention according to claim 3 is characterized in that the outer diameter of the fuel supply pipe is at most 4 mm, and the distance between the support members attached to the vehicle body side to support the fuel supply pipe is at least 150 mm.

By setting the spacing of the support members to at least 150 mm, even if the roll angle of the rocking tricycle is 180 °, a suitable fuel supply pipe can be obtained.

Best Mode for Carrying Out the Invention The best mode for carrying out the present invention will be described below based on the accompanying drawings. In addition, the figure shall be seen in the sign direction.

1 is a side view of a rocking tricycle according to the present invention, the rocking tricycle 10 is a vehicle body 14 having a bar handle 12 for steering one front wheel 11 and a seat 13 on which a driver is seated. And the vehicle body rear portion 18 including the pair of left and right rear wheels 16 and 16 and the power unit 17 for driving the rear wheels 16 and 16 through the swing mechanism 21, thereby providing the entire vehicle body ( It is a vehicle which connected the vehicle body rear part 18 so that up-and-down swinging and rolling were possible.

The whole body 14 is provided with a front cover 23 in front of the bar handle 12, a wind screen 26 having a wiper 24 attached to the upper side of the front cover 23, the bar handle 12 and the sheet 13 to install the step floor (27) downwardly between, and the posts (28, 28) of the pair of right and left from the rear of the seat 13 (the sign of the front 280,000 illustrated hereinafter) sewoomyeo a, The loop 31 is applied to the wind screen 26 and the posts 28 and 28, and the luggage compartment 32 is disposed behind the seat 13. In addition, 35 is a front fender which covers the upper part of the front wheel 11, 36 is a rearview mirror, 37 is a headlamp, 38 is a fuel tank installed under the seat 13, 41 is a fuel pump installed in the fuel tank 38 , 42 is a cushion unit for shock absorbing between the vehicle body frame on the entire body 14 side and the swing mechanism 21.

The vehicle body rear part 18 connects the intake apparatus 51 and the exhaust apparatus 52 to the power unit 17, These power units 17, the intake apparatus 51, the exhaust apparatus 52, other functional parts, The rear wheels 16 and 16 are covered with an integral cover 53.

The swing mechanism 21 is a link 55 having one end attached to the lower body frame lower portion of the entire body 14 so as to swing forward and backward, and the front end is swingably attached to the other end of the link 55, and the rear end is attached to the vehicle body. It consists of a joint case 57 attached to the power unit 17 of the rear part 18 via the bracket 56.

The joint case 57 includes a case main body 61, a joint shaft 62 rotatably inserted into the case main body 61, and a rear end portion attached to the power unit 17 side, and these case main bodies 61. ) And a damper portion 63 interposed between each of the joint shafts 62.

The damper portion 63 has a plurality of cylindrical rubbers interposed between the plurality of pressing members extending in the radial direction from the joint shaft 62 and the case main body 61, and the relative rotation of the pressing member and the case main body 61 is prevented. Is a so-called "Neidhardt damper" which exerts a damper action by compressing rubber.

2 is a side view (partial cross-sectional view) showing a rear portion of the vehicle body of the rocking tricycle according to the present invention, and attaching the brackets 56 with bolts 66 and 66 to the joint shaft 62 constituting the rocking mechanism 21. The lower part of the power unit 17 is attached to the bracket 56 with bolts 67 and 67, and the intake device 51 is attached to the upper part of the cylinder head 68 constituting the power unit 17. The exhaust device 52 is attached to the lower part of the cylinder head 68, and the stay member 71 which supports the cover 53 to the upper part of the power unit 17 is shown. In addition, the arrow (front) in the figure shows the front of a vehicle (similarly below). 73 in the figure is a radiator arranged on the right side of the power unit 17.

The power unit 17 is composed of an engine 76 and a continuously variable transmission 77 integrally connected to the engine 76, and the rotation of the crankshaft 81 is driven through the belt 82 through the driven shaft 83. ), Which is transmitted from the driven shaft 83 to the output shaft 84 via a gear (not shown) to drive the left and right rear wheels 16 and 16 (refer to FIG. 1) attached to the output shaft 84. 86 is the head cover, 87 is the cylinder block, and 88 is the transmission case.

The cylinder head 68 is provided with an intake pipe 95 having a combustion injection valve 91 for injecting fuel into an intake passage, and the fuel of the fuel tank 38 (see FIG. 1) is attached to the fuel injection valve 91. The resin fuel supply pipe 92 extending from the pump 41 (see FIG. 1) is connected.

The intake apparatus 51 includes an intake pipe 95, a throttle body 96 connected to an end of the intake pipe 95, a connecting tube 97 connected to the inlet side of the throttle body 96, and It consists of an air cleaner 98 connected to the connecting tube 97, and both the throttle body 96 and the air cleaner 98 are located above the power unit 17, and the air cleaner 98 is attached to the stay member 71. Support). In addition, 101 is a throttle cable extended from the throttle grip of the bar handle 12 (refer FIG. 1) for opening and closing the throttle valve installed in the throttle body 96. As shown in FIG.

The exhaust device 52 attaches one end to the lower side of the cylinder head 68 with bolts 104 and 104 and nuts 105 and 105 and at the same time extends the left side of the cylinder head 68 almost upwards. It is connected to the exhaust pipe 106, the other end of this front side exhaust pipe 106, and the catalyst pipe 107 extended rearward so that it may fall back slightly, and it is connected to the rear side of this catalyst pipe 107, and obliquely rearwards. Rear exhaust pipe 108 extending downward, a silencer 111 connected to the rear end of the rear exhaust pipe 108, and a tail pipe 112 extending obliquely downward from the silencer 111. The silencer 111 is disposed at a position lower than the catalyst tube 107 and the silencer 111 is attached to the protrusion 88a protruding from the transmission case 88 through the bracket 114. .

Considering the attachment from the front side exhaust pipe 106 to the cylinder head 68 to the rear side exhaust pipe 108 as one exhaust pipe, the front exhaust pipe 106 is approximately upward from the lower side of the cylinder head 68. Extends, the catalyst tube 107 extends rearward approximately horizontally, and the rear end exhaust pipe 108 extends obliquely downwards in the rear so that the confined space in the cover 53 at the rear of the vehicle body 18 is extended. It is possible to increase the overall length of one exhaust pipe, that is, the length of the exhaust pipe.

The stay member 71 is a stay body 117 attached to the power unit 17, a frame member 118 attached to an upper end of the stay body 117, and a cover attached to the frame member 118. It consists of a support bracket 121.

The stay main body 117 is composed of the front side stays 124 and 125 and the rear side stays 127, and the rear side stays 127 are located between the air cleaner 98 and the silencer 111, and the silencer 111 ) Is a member provided with a heat shield plate 128 for shielding heat generated from the air cleaner 98 from being transmitted to the air cleaner 98 and the like.

The cover support bracket 121 includes a pair of left and right front side brackets 131 and 131 (only the front reference numeral 131 is shown) provided at the front side and a pair of left and right rear side brackets 132 and 132 provided at the rear side. (Only the front reference numeral 132 is shown), and is a member in which the integral cover 53 is attached to the bolt 133 through rubber.

The cover 53 is provided with a front side opening 136 for directing the head cover 86 side toward the front of the vehicle body at the front side, and a vent hole 137 having a maze structure at the upper side for venting the inside and outside of the cover 53. ) And a rear side opening 138 in the rear side.

The component parts of the intake device 51, the component parts of the exhaust device 52, and the fuel injection valve 91 are functional parts, and these functional parts and the power unit 17 (that is, the engine 76 and the continuously variable transmission). 77 constitutes a drive unit 130 for driving the rear wheels 16 and 16.

3 is a plan view of the main part of the oscillating tricycle according to the present invention, and arranges the power unit 17 between the left and right rear wheels 16 and 16, and moves the throttle body 96 constituting the intake device 51 in the vehicle body front and rear directions. Disposed on the vehicle body center line 140 extending from the vehicle body, the air cleaner 98 disposed behind the throttle body 96, and extending the catalyst pipe 107 constituting the exhaust device 52 in the vehicle body front-rear direction. Simultaneously, the longitudinal direction of the catalyst tube 107 and the longitudinal direction of the silencer 111 are arranged at right angles by extending the silencer 111 in the vehicle width direction. In addition, 141A and 141B are wheels of the rear wheels 16 and 16, and these wheels 141A and 141B are connected through a differential mechanism (not shown).

The throttle body 96 is connected to the rear end of the intake pipe 95 extending rearward from the cylinder head 68.

The air cleaner 98 is attached to the rear side of the frame member 118 fitted in a U-shape by bolts 142 at three points. The air cleaner 98 is short in the vehicle width direction in the front and rear directions when viewed in a plane constituting the air cleaner 98. The long rectangular air cleaner case 143 is separated into a triangular duct chamber 146 and a purification chamber 147 when viewed in a plan view as the partition wall 144, and is formed in a triangular shape on the upper upper wall of the duct chamber 144. The inlet port 148 is provided, and the upper side duct 151 which connects the duct chamber 144 and the purification chamber 147 to the upper wall of the air cleaner case 143 is provided. In addition, S1 in the figure is the width | variety of the vehicle body left-right direction of the air cleaner 98, S2 is the length of the vehicle body front-back direction of the air cleaner 98, and there is a relationship of S1> S2. 152 is an extension part provided integrally with the connecting tube 97 and is a part disposed in the purification chamber 147.

The catalyst tube 107 and the silencer 111 form two sides of the rectangular space 155.

Since the space 155 is rectangular, a larger area can be obtained between the rear wheels 16 and 16, and the space 155 includes a throttle body 96, an air cleaner 98, and many other functional parts (e.g., And fuel injection valve 91, electrical equipment, batteries (not shown), etc. can be arranged in an orderly and compact manner, and compactness can be achieved, and the space 155 can be effectively used.

The frame member 118 extends in the vehicle width direction and is disposed parallel to the front frame 161 while being rearward of the front frame 161 and crossing the front end of the catalyst tube 107. The rear frame 162, the left frame 163 connected to the front frame 161 and the rear frame 162 so as to be orthogonal to the front frame 161 and the rear frame 162 from the left end of the front frame 161, and the left frame 163 It consists of a right frame 164 connected to each of the front frame 161 and the rear frame 162 so as to be parallel to the left frame 163 to the right side of the (), and to the left frame 163 and the right frame 164 The air cleaner 98 is attached.

The rear frame 162 is a member supported by the rear side stay 127 having a substantially V-shape.

The radiator 73 is attached to the right front side of the cylinder block 87 and the transmission case 88 via a case cover (not shown), and is arranged to project from the cylinder block 87 side to the front of the right rear wheel 16. will be. 73a is a radiator cap.

The cover 53 shown by the dashed line covers the upper portion of the power unit 17, the intake device 51, the exhaust device 52, the rear wheels 16 and 16, the stay member 71, the radiator 73, In front of the radiator 73, the traveling wind is blown into the inside of the cover 53, and in particular, the louver 166 for contacting the traveling wind with the radiator 73 is provided.

The fuel supply pipe 92 extends obliquely rearward from the fuel pump 41 to the upper side of the fuel tank 38 to the right, and further extends the lower side of the fuel tank 38 to the front of the vehicle body, and U-turn rearwardly. It is a member which approaches to the swinging mechanism 21 (refer FIG. 1) later, extends backward along the swinging mechanism 21, and is connected to the fuel injection valve 91 provided in the intake pipe 95, and is of thin diameter. Since it is elastically deformed by resin, the assembly property to a rocking tricycle can be improved and it can follow the rocking | fluctuation of a vehicle body. 168 is a filler cap of the fuel tank 38.

4 is a side view of an essential part of a rocking tricycle showing a fuel supply pipe according to the present invention, and the fuel tank 38 has a pair of left and right upper brackets 202 and 202 (front reference numeral 202 ) installed in the vehicle body frame 201. The flange 38a is attached to the flange portion 38a, and the back plate 204 is attached to the pair of left and right lower brackets 203 and 203 (shown only with the reference numeral 203 in the front) attached to the body frame 201. The bottom part 38b was attached through this, and the built-in fuel pump 41 is attached to the upper side of this fuel tank 38. As shown in FIG.

The fuel supply pipe 92 is a pipe formed of an elastically deformable thermoplastic material and having an outer diameter of up to 7 mm, preferably an outer diameter of up to 4 mm, one end of which is connected to the fuel pump 41 through the connector 206. The rear side of the fuel tank 38 is extended rearward, bent downward from the rear of the fuel tank 38 to extend downward obliquely forward along the car frame 201, and the body frame 201. The joint case 57 of the swing mechanism 21 is placed near the rear end of the joint case 57 in the vicinity of the bent portion 201a, and the tip is connected to the fuel injection valve 91 through the connector 208, The way is supported by the clamps 209 and 209 attached to the vehicle body frame 201 and the clamps 210 and 210 attached to the joint case 57.

Since the fuel supply pipe 92 has a small outer diameter so as to have flexibility, the curvature radius of the bend can be reduced, the degree of freedom of layout is high, and the power unit 17 swings up and down or the rear body 18 rolls. In particular, even if bending and twisting forces are applied to a portion of the fuel supply pipe 92 extending from the body frame 201 to the joint case 57 and a portion from the joint case 57 to the fuel injection valve 91, Its flexion and ease of twisting make it less susceptible to this influence and can withstand large fuel pressures. In addition, it is also possible to bend easily when laying out, and the piping work can be easily performed.

Although not shown, the fuel supply pipe 92 is fixed to at least one of the vehicle body frame 201 and the joint case 57 at a plurality of points.

In addition, the space | interval of the cranks 209 and 209 and the space | interval of the clamps 210 and 210 were ensured at least 150 mm, respectively. Thereby, even if the fuel supply pipe 92 is twisted large (for example, 180 degrees) by the roll motion of a vehicle body, the fuel supply function of the fuel supply pipe 92 can be fulfilled.

5 is an explanatory view of a fuel supply pipe according to the present invention, wherein the fuel supply pipe 92 is a member formed from a thermoplastic material (for example, nylon), and has a moldability compared with the case of forming from an elastic material such as rubber. The outer circumferential surface may be covered with a coating layer 211 made of an elastic member (for example, rubber), and the fuel supply pipe 92 may be covered with the coating layer 211 as described above to maintain the fuel supply pipe 92. The fuel supply pipe 92 can be extended for a long time by protecting it from the adhesion of the battery liquid to the battery, the adhesion of the acid rain while driving, and the like. The coating layer 211 may be provided in the whole from one end to the other end of the fuel supply pipe 92 or may be provided in a part of the fuel supply pipe 92.

Further, the fluorine rubber layer may be formed on the fuel supply pipe 92 so as to cover the inner circumferential surface thereof. When the gasoline (sour gasoline) with a high sulfur content flows inside the fuel supply pipe 92 by the fluorine rubber layer, even if the fuel supply pipe 92 is protected from the gasoline, the life of the fuel supply pipe 92 is extended. Can be planned.

The connector 206 connected to the discharge side pipe 215 provided in the fuel pump includes a housing 216 and a retainer 218 coupled to an end of the housing 216.

The housing 216 connects the connecting portion 221 connected to the end portion 92a of the fuel supply pipe 92 and the end portion 215a of the discharge-side pipe 215 while communicating with the through hole 222 provided in the connecting portion 221. The pipe insertion hole 223 to insert, the annular part 224 provided in the edge part, and the opening parts 225 and 225 provided in the side surface are provided.

The retainer 217 includes an annular base portion 226, a plurality of elastically deformable tip portions 227 extending from the base portion 226 so that the ends thereof are retracted, and side projections provided on the side surfaces of these tip portions 227. 228, the front end 227 hits the diameter expansion portion 215b of the discharge side pipe 215, and the side protrusion 228 is coupled to the annular portion 224 of the housing 216, thereby discharging the discharge side pipe ( The connector 206 is connected to 215. In addition, 231 and 231 are O-rings as a sealing member, and 232 is a positioning member which positions the edge part 215a of the discharge side pipe 215 in the pipe insertion hole 223. As shown in FIG.

Fig. 6 is a graph showing the relationship between the flatness ratio and the required bending radius R of the fuel supply pipe according to the present invention, where the vertical axis represents the flatness ratio and the horizontal axis represents the required bending radius R.

7 is an explanatory diagram for explaining the flatness ratio and the required bending radius R of the fuel supply pipe according to the present invention.

In the state where the fuel supply pipe is extended straight without being bent in FIG. 7, the cross section taken along the line A-A of the fuel supply pipe is circular, and the outer diameter is D1 and the thickness (plate thickness) is t1. In the state where the fuel supply pipe is bent (the minimum bending radius of the neutral position is R [required bending radius R]), the cross section taken along the line BB of the fuel supply pipe is almost elliptical, and the short diameter of the ellipse's outline is D2, thickness. (Plate thickness) becomes t2.

From the above, the flatness ratio = [short diameter side outer diameter D2 + plate thickness t2] / [initial outer diameter D1 + plate thickness tl] is set.

Referring back to FIG. 6, the graph shows the relationship between the flatness ratio and the required bending radius R for the outer diameter of the fuel supply pipe being 4.0 mm, 5.0 mm, 7.0 mm and 8.0 mm.

As the required bending radius R exceeds the predetermined value M, the area where the flatness ratio is less than the allowable flatness ratio is an NG zone where the flatness is small and the fracture of the fuel supply pipe is large even though the required bending radius R is large. The outer diameter is outside the NG zone at up to 7.0 mm (ie, 4.0 mm, 5.0 mm, 7.0 mm), but enters the NG zone at an outer diameter of 8 mm.

In the rocking tricycle of the present embodiment, the flatness ratio is 80% or more and the required bending radius R is 25R. Therefore, in the fuel supply pipe having an outer diameter of up to 7 mm, it is possible to secure the fuel supply amount and sufficient elasticity required for the swing tricycle to swing and roll.

1, 3, and 4, the present invention relates to an oscillating tricycle 10 having a power unit 17 as a swing unit composed of an engine 76 and a continuously variable transmission 77. In order to supply fuel to the 76, the fuel pump 41 is provided in the fuel tank 38 disposed on the vehicle body side, and the fuel injection valve 91 provided on the engine 76 side is attached to the fuel pump 41. It is connected via the fuel supply line 92 which consists of an elastically deformable resin pipe. It is characterized by the above-mentioned.

As a result, the fuel supply pipe 92 is made of resin, and as a fuel pipe connecting the fuel pump 41 and the fuel injection valve 91 to ensure high breakdown voltage and elastic deformation, the power unit on the vehicle body side ( In addition to the swing motion of 17), the fuel supply pipe 92, which is a resin pipe, is bent even when the roll motion is performed, so that the fuel pipe of the swing tricycle 10 including the fuel pump 41 and the fuel injection valve 91 can be realized. Can be.

The present invention is also characterized in that the fuel supply pipe 92 is made of a thermoplastic resin material, and the outer diameter thereof is formed to a maximum of 7 mm.

As a result, since the fuel supply pipe 92 is a thermoplastic resin material, it is possible to produce a smaller thickness and a smaller inner diameter than the rubbery high pressure fuel supply pipe that needs to be knitted and inserted with a high-pressure fiber material. Can be made small. Thereby, the fuel supply amount and sufficient elasticity which are necessary for the oscillation tricycle 10 can be ensured.

In addition, in the present invention, the outer diameter of the fuel supply pipe 92 is at most 4 mm, and the clamps 209 and 209 (or the clamps 210 and 210 as the support members attached to the vehicle body side in order to support the fuel supply pipe 92). ] Is at least 150 mm apart.

Thereby, for example, even if the roll angle of the rocking tricycle 10 is 180 degrees, it can be set as the suitable fuel supply line 92. FIG.

Moreover, this invention can be applied to the motorcycle of a unit swing.

The fuel supply structure of the swinging tricycle of the present invention is suitable for the swinging tricycle.

In the invention according to claim 1, since the fuel pump on the vehicle body side and the fuel injection valve on the engine side are connected to a fuel supply pipe, which is a resin pipe that is elastically deformable, the fuel supply pipe is made of resin to connect the fuel pump and the fuel injection valve. In addition to ensuring high pressure resistance and enabling elastic deformation, in addition to the swing motion of the swing unit on the vehicle body side, the fuel supply pipe, which is a resin pipe, is bent even in the roll motion, and includes a fuel pump and a fuel injection valve. The fuel supply pipe of the tricycle can be realized.

In the invention according to claim 2, since the fuel supply pipe is made of a thermoplastic resin material and its outer diameter is formed to a maximum of 7 mm, the high-pressure rubbery high pressure fiber is required to be knitted and inserted since the fuel supply pipe is a thermoplastic resin material. It is possible to produce a smaller thickness and a smaller inner diameter as compared with the fuel supply pipe for the molten fuel, and to reduce the outer diameter. Thereby, the fuel supply amount and sufficient elasticity which are required for a rocking tricycle can be ensured.

In the invention according to claim 3, the outer diameter of the fuel supply pipe is set to 4 mm at maximum, and the distance between the supporting members of the fuel supply pipe is at least 150 mm, so that even if the roll angle of the rocking tricycle is 180 °, a suitable fuel supply pipe can be obtained.

Claims (3)

In the swing tricycle comprising a swing unit comprising an engine and a continuously variable transmission, A fuel pump is provided in a fuel tank disposed on the vehicle body side to supply fuel to the engine, and the fuel injection valve provided on the engine side is connected to the fuel pump via a fuel supply pipe including a resin pipe elastically deformable. The fuel supply structure of the rocking tricycle characterized by the above-mentioned. The fuel supply structure for a rocking tricycle according to claim 1, wherein the fuel supply pipe includes a thermoplastic resin material and has an outer diameter of 7 mm or less. 3. The fuel supply structure for a rocking tricycle according to claim 2, wherein the fuel supply pipe has an outer diameter of 4 mm or less, and an interval of a support member attached to the vehicle body side for supporting the fuel supply pipe is 150 mm or more.

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