JP2006044583A - Fuel feeding device for riding type vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance fuel feeding efficiency, to reduce that thermal influence is given from an exhaust device and an engine unit to a fuel feeding device and to provide insurance of fuel tank capacity and low center of gravity of a vehicle body. <P>SOLUTION: The exhaust device of the engine unit 14 is arranged below an upper pipe and at one side in a vehicle width direction, a fuel pump 121 is installed in the fuel tank 17 arranged at the opposite side thereto and a fuel outlet 122 is provided on an upper part of the fuel tank 17. A cylinder assembly 32 is forwardly inclined and a mixture air production means (37) and an air cleaner 39 are connected to a rear upper part thereof. The fuel outlet 122 and the mixture air production means (37) are arranged at equal height to the upper pipe 3 between left and right upper pipes 3 respectively and the fuel outlet 122 and a fuel pipe connection part 123 are connected by a flexible fuel pipe 124. The fuel pipe 124 is approximately horizontally and longitudinally arranged at approximately equal height to the upper pipe 3 between the left and right upper pipes 3. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel supply device for a straddle-type vehicle that supplies fuel from a fuel tank to an engine unit.

In a three-wheel or four-wheel straddle-type vehicle (such as a buggy vehicle or ATV) for traveling on rough terrain, an engine unit is mounted on a body frame formed of a steel pipe or the like as disclosed in Patent Documents 1 to 3 and the like. A fuel tank is installed behind the engine unit, and a fuel pipe is connected between the engine unit and the fuel tank.
Japanese Patent Laid-Open No. 2002-225876 JP-A-60-94878 Japanese Utility Model Publication No. 60-85290

  However, when installing a fuel tank behind the engine unit, the fuel pipe connecting the two must be bent (bent) into a complex shape along the other members, resulting in a long fuel pipe and pressure loss. As a result, the fuel supply efficiency decreases, and in order to compensate for this, it is necessary to increase the size of the fuel pump.

  In addition, since there is an exhaust device behind the engine unit and adjacent to the fuel tank, there is a concern that the fuel tank may be thermally damaged. Even if the fuel tank is arranged above the engine unit as in a motorcycle, it is not only easily affected by the heat of the engine unit itself, but also a large capacity of the fuel tank cannot be secured.

  The present invention has been made to solve the above-described problems, and improves the fuel supply efficiency by a simple and highly durable structure, and at the same time, the fuel supply device is affected by heat from the exhaust device or the engine unit. It is an object of the present invention to provide a fuel supply device for a straddle-type vehicle that can reduce fuel consumption and can secure a fuel tank capacity and lower the center of gravity of a vehicle body.

  In order to achieve the above object, a fuel supply device for a saddle-ride type vehicle according to the present invention includes a front wheel and a rear wheel at the front and rear portions of a vehicle body frame that includes a pair of left and right upper pipes extending substantially horizontally in the vehicle front-rear direction. The engine unit is mounted on the vehicle body frame so as to be positioned between the front and rear wheels and below the upper pipe, and the exhaust device of the engine unit is disposed below the upper pipe and on one side in the vehicle width direction. A fuel tank is disposed behind the engine unit and on the opposite side of the exhaust system, and a fuel pump is accommodated and installed inside the fuel tank to provide a fuel outlet at the top of the fuel tank, while a cylinder assembly of the engine unit is tilted forward. Then, an air-fuel mixture generating means and an air cleaner are connected to the upper part, and the fuel outlet and the air-fuel mixture generating means Arranged between the left and right upper pipes at the same height as the upper pipe, the air cleaner is arranged so as to protrude above the upper pipe, and the fuel outlet and fuel mixture connection of the air-fuel mixture generating means The fuel pipes are connected to each other by a flexible fuel pipe, and the fuel pipe is disposed between the left and right upper pipes at a height substantially equal to that of the upper pipe in the front-rear direction.

  In the fuel supply device for a saddle-ride type vehicle according to the present invention, the exhaust device and the fuel tank are arranged so as to protrude outward in the vehicle width direction from the left and right upper pipes of the vehicle body frame, respectively, and in plan view of the vehicle The fuel tank is arranged so that the fuel tank bulges over the vehicle center line to the exhaust system side.

  Furthermore, the fuel supply device for a saddle-ride type vehicle according to the present invention, the fuel outlet is disposed inside an upper pipe on the opposite side of the exhaust device in a plan view of the vehicle, and a fuel pipe connection portion of the air-fuel mixture generating means is provided. The fuel pipe was arranged on the same side as the fuel outlet, and the fuel pipe was arranged along the inside of the upper pipe on the opposite side of the exhaust device.

  In the straddle-type vehicle fuel supply device according to the present invention, the fuel pipe connection portion is provided at a position higher than the fuel outlet.

  In the fuel supply device for a saddle-ride type vehicle according to the present invention, a relative position restricting means for restricting a relative position change with respect to a vehicle body frame above the engine unit is provided near the outside of the mixture generating means. The fuel pipe is disposed between the position regulating means and the air-fuel mixture generating means.

  Further, in the fuel supply device for a saddle-ride type vehicle according to the present invention, the fuel pipe is disposed so as to pass below the air cleaner, and a pipe holding shape for holding the fuel pipe is integrally formed on the lower surface of the air cleaner. .

  The fuel supply device for a saddle-ride type vehicle according to the present invention includes a front wheel and a rear wheel arranged at the front and rear portions of a body frame extending substantially horizontally in the vehicle front-rear direction, and an engine unit is mounted between the front and rear wheels, A fuel tank is disposed behind the engine unit, and a cylinder assembly, a crankcase, a transmission, and a fuel tank, which form the engine unit in a side view of the vehicle, sequentially overlap without being separated from each other, and are substantially V-shaped. The battery is disposed in the V-shaped inner space, while the air-fuel mixture generating means of the engine unit and the fuel outlet of the fuel tank are disposed near both upper ends of the V-shaped space, A fuel pipe was connected substantially horizontally between the air-fuel mixture generating means and the fuel outlet.

  According to the present invention, the engine unit and the fuel tank can be mounted at the lower part of the vehicle body frame to lower the center of gravity of the vehicle, and the fuel pipe is disposed at a location away from the engine unit to reduce the thermal effect. Can be made.

  Since the fuel tank is installed inside the vehicle body frame and behind the engine unit, a large capacity can be ensured, and the component layout inside the vehicle body is also good.

  Moreover, the fuel pipe can be formed in a simple straight tube that does not meander in the vertical direction, thereby improving the fuel supply efficiency. Since the fuel pipe is disposed inside the upper pipe of the vehicle body frame, the fuel pipe can be protected and durability can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a left side perspective view showing an example of a saddle-ride type vehicle to which the present invention is applied, and FIG. 2 is a left side view showing only a vehicle body frame, an engine unit, a fuel tank, etc. FIG. 3 is a plan view taken along arrow III in FIG.

  As shown in FIGS. 1 to 3, the saddle riding type vehicle 1 includes a vehicle body frame 2 assembled in a substantially cage shape by using, for example, a steel pipe material. The body frame 2 includes a pair of left and right upper pipes 3 and a lower pipe 4, a pair of left and right rear vertical pipes 5 that connect the rear ends of these pipes in the vertical direction, and a substantially central portion of the rear vertical pipe 5 and the lower pipe 4. A pair of left and right rear horizontal pipes 6 that are connected in the front-rear direction, a pair of left and right front vertical pipes 7 that are vertically connected between the upper pipe 3 and the lower pipe 4 at the front, and the front vertical pipe 7 and the upper The left and right upper pipes include a pair of left and right front horizontal pipes 8 that connect the front part of the pipe 3 in the front-rear direction, and a plurality of bridge members 9 that connect the pair of left and right members. The front end of 3 is bent downward and fixed to the front end of the lower pipe 4.

  A pair of left and right front wheels 11 and rear wheels 12 are provided on the front and rear of the vehicle body frame 2 via a suspension mechanism (not shown). The front wheels 11 and the rear wheels 12 are provided between the front and rear wheels 11 and 12 and below the upper pipe 3. The engine unit 14 is suspended and mounted substantially at the center of the vehicle body frame 2 so as to be located at the center.

  A saddle-type seating seat 15 is installed above the upper pipe 3, and a steering handle 16 for steering the front wheels 11 is provided in front of the upper pipe 3. A fuel is disposed below the seating seat 15 and behind the engine unit 14. A tank 17 is provided. A heat exchanger (oil cooler, radiator, etc.) 18 of the engine unit 14 is installed near the foremost part of the vehicle body frame 2.

  A front cover 21 is provided at the front of the vehicle body so as to cover the upper front portion of the vehicle body frame 2, and a front fender 22 that covers the left and right front wheels 11 is integrally or integrally formed. And a rear fender 24 that covers the left and right rear wheels 12 is formed integrally or integrally. These members 21 to 24 are, for example, synthetic resin molded products.

  For example, the engine unit 14 includes an engine body 28 and a belt-type continuously variable transmission 29 that are integrally formed. The engine body 28 is, for example, a water-cooled four-cycle single-cylinder engine, and includes a crankcase 31 and a cylinder assembly 32 that is disposed in a forwardly inclined state of about 45 degrees in front of the upper surface of the crankcase 31. The cylinder head 34 is mounted on the cylinder block 33.

  As shown in FIGS. 1 and 2, the cylinder assembly 32, the crankcase 31, the transmission device 29, and the fuel tank 17 that constitute the engine unit 14 in a side view of the vehicle are sequentially overlapped without being separated from each other, and are substantially V-shaped. The battery 35 is arranged in the V-shaped inner space.

  An engine intake system is disposed above and below the cylinder assembly 32 and below the seating seat 15. The engine intake system is disposed at the upper part of the throttle body 37 as an air-fuel mixture generating means connected to the intake port on the rear surface of the cylinder head 34 via the intake pipe 36 and in front of the seat 15 and through the intake pipe 38. And an air cleaner 39 connected to the upstream side of the throttle body 37. The air cleaner 39 is disposed so as to protrude upward from the upper pipe 3 of the vehicle body frame 2, and is covered with a cleaner cover 40 made of the same material as the front cover 21 and the rear cover 23. A breather hose 41 extending from the upper part of the crankcase 31 of the engine unit 14 is connected to the air cleaner 39.

  On the other hand, the exhaust device of the engine unit 14 is arranged on one side in the vehicle width direction (right side in the present embodiment) and below the upper pipe 3 of the body frame 2. The exhaust device is composed of an exhaust pipe 42 and an exhaust muffler 43. The exhaust pipe 42 extends forward from an exhaust port 44 (see FIG. 2) on the front surface of the cylinder head 34 and curves rightward and rearward. The right side of the vehicle body extends substantially horizontally rearward along the lower side of the upper frame 3 of the vehicle body frame 2 and is connected to the exhaust muffler 43 at the downstream end thereof. The exhaust muffler 43 is disposed, for example, above the rear wheel 12 and below the rear fender 24 (or the rear cover 23) in a side view.

  4 is a cross-sectional view of the engine unit 14 developed along line IV-IV in FIG. The crankcase 31 constituting the lower portion of the engine body 28 is a left-right split type in which a left case 47 and a right case 48 are combined, and a crankshaft 49 is disposed horizontally and in the vehicle width direction at the front of the inside. Is done. Further, a case cover 50 is mounted on the left opening surface of the left case 47.

  Also, a piston 52 is slidably provided in a cylinder bore 51 (cylinder) formed in the cylinder block 33, and this piston 52 is connected to a crank pin 54 of a crankshaft 49 via a connecting rod 53, so that the cylinder bore The reciprocating motion of the piston 52 in 51 is converted into the rotational motion of the crankshaft 49 and becomes the output of the engine body 28.

  Two balancer shafts 55 are arranged in parallel at the front lower side and the rear upper side of the crankshaft 49 (the front balancer shaft is not shown), and these balancer shafts 55 rotate to the crankshaft 49 via the balancer gear 56. By being driven, engine vibration is reduced.

  A cam drive chamber 58 is provided on the left side surface of the cylinder assembly 32 in a plan view of the vehicle (see FIG. 4), and a transmission 29 is disposed on the opposite side (right side) of the cam drive chamber 58 with the cylinder assembly 32 interposed therebetween. Yes. In FIG. 4, reference numeral 59 denotes a generator device for power generation, and reference numeral 60 denotes a low precoil starter device for starting the engine.

  The transmission 29 is disposed in a space between the belt case 61 installed on the right side of the crankcase 31, that is, the right side of the right case 48, and the case cover 62 mounted on the right side of the belt case 61. Has been.

  The transmission device 29 includes, for example, a drive pulley shaft 64 disposed coaxially on the right side of the crankshaft 49, a driven pulley shaft 65 disposed in parallel behind the drive pulley shaft 64, and a shaft mounted on the drive pulley shaft 64. The drive pulley 66, the driven pulley 67 mounted on the driven pulley shaft 65, the automatic centrifugal clutch device 68 provided on the right side of the drive pulley 66, and the front and rear pulleys 66, 67 are wound around. And a V-belt 69.

  When the engine body 28 is actuated and the rotational speed of the crankshaft 49 reaches a predetermined value, the automatic centrifugal clutch device 68 is connected to rotate the drive pulley shaft 64 and the drive pulley 66, and this rotation is driven by the V belt 69. 67 and the driven pulley shaft 65.

  A weight roller 70 is built in the drive pulley 66. As the rotational speed of the drive pulley 66 increases, the weight roller 70 expands in the centrifugal direction as the centrifugal force increases, and the effective pulley diameter is increased by narrowing the face interval of the drive pulley 66. On the other hand, since the face interval of the driven pulley 67 is increased and the effective pulley diameter is reduced, the rotation is increased steplessly.

  The rotation of the driven pulley shaft 65 is transmitted to the transmission countershaft 72 that is coaxially and integrally connected to the rotation, and the rotation of the transmission countershaft 72 is transmitted to the transmission drive shaft 74 via the transmission gear device 73 of several stages. It is transmitted to a front wheel driving propeller shaft 78 and a rear wheel driving propeller shaft 79 shown in FIG. 1 via a bevel gear shaft 75 and a bevel gear device 76.

  The front wheel driving propeller shaft 78 and the rear wheel driving propeller shaft 79 are oriented substantially horizontally on the center line C (see FIG. 3) of the saddle riding type vehicle 1 in the vehicle length direction (front-rear direction), and the front and rear ends thereof are respectively The front wheel differential device 81 and the rear wheel differential device 82 are connected. A pair of left and right axle shafts (not shown) extending in the vehicle width direction from the front wheel differential device 81 and the rear wheel differential device 82 are connected to the front and rear wheels 11 and 12.

  In this way, the output of the engine body 28 (rotation of the crankshaft 49) is steplessly changed by the transmission 29, and the front and rear wheels 11, the propeller shaft 78 for driving the front wheels and the propeller shaft 79 for driving the rear wheels are transmitted. 12 is transmitted.

  As shown in FIGS. 1, 2 and 5 to 8, the engine unit 14 is suspended and mounted on the vehicle body frame 2 in a vibration-proof manner by a pair of front and rear lower engine mounts 85 and 86. Yes.

  The configuration of the lower engine mount 85 is as follows. As shown in FIG. 5, plate-like mounting brackets 88 are fixed to the left and right lower pipes 4 of the vehicle body frame 2 so as to stand upward. On the other hand, a left-side case 47 and a right-side case 48 constituting the crankcase 31 are integrally formed with a horizontal hole-shaped mount housing 89, and a pair of left and right substantially cylindrical mounting rubbers 91 are tightly inserted therein. . A cushion flange 92 is formed on the outside of each mount rubber 91, a metal washer 93 is applied on the outside thereof, and a single metal spacer pipe 94 passing through the center of each mount rubber 91 is inserted.

  A mount housing 89, a mount rubber 91, and a metal washer 93 are sandwiched between the left and right mount brackets 88 of the body frame 2, and a long bolt-like mount bolt 95 is mounted on the mount bracket 88, the metal washer 93, the spacer pipe 94, and the mount. A mount nut 96 is fastened from the opposite side through the rubber 91 and the mount housing 89 in the vehicle width direction. Since the spacer pipe 94 is interposed between the left and right mounting brackets 88, the fastening force of the mounting bolt 95 does not reach the mounting rubber 91, so that the engine unit 14 is supported by the body frame 2 so that it can float slightly due to the elasticity of the mounting rubber 91. Thus, the engine vibration is not easily transmitted to the body frame 2.

  On the other hand, the upper engine mount 86 functions as a relative position restricting means for restricting a relative position change with respect to the vehicle body frame 2 above the engine unit 14, and is fixed to the vehicle body frame 2 side as shown in FIGS. Frame side mount member 101, engine unit side mount member 102 fixed to the engine unit 14 side, and cushion member 103.

  The frame side mounting member 101 has a structure in which an annular ring 106 is fixed to a flat frame mounting bracket 105, and the upper end portion of the frame mounting bracket 105 is an intermediate portion of the upper pipe 3 on the left side of the vehicle body frame 2 with two bolts 107. It is fastened and fixed to a mount fixing bracket 108 provided on the left side surface.

  The engine unit side mounting member 102 has a configuration in which a core rod 111 extending vertically upward is fixed to an upper surface of an L-shaped engine mounting bracket 110 when viewed in the front-rear direction (see FIG. 8), and the upper surface of the engine mounting bracket 110 is a core. It also serves as a hook (stopper) at the lower end of the bar 111.

  The engine unit side mounting member 102 is fastened together with the thermostat housing 112 with two bolts 114 together with a lid 113 of the thermostat housing 112 provided at the lower intermediate portion of the engine mounting bracket 110 at the rear intermediate portion of the cylinder assembly 32. Contributes to the simplification of the surrounding structure.

  On the other hand, the cushion member 103 is made of an elastic material such as rubber or urethane, and a flange 116 is formed at the lower end thereof. The cushion member 103 is closely fitted around the core rod 111 of the engine unit side mounting member 102 with the flange 116 facing downward, and the flange 116 of the cushion member 103 is inserted into the flange (engine mounting bracket 110) of the engine unit side mounting member 102. The upper surface).

  The annular ring 106 of the frame side mount member 101 is loosely fitted around the cushion member 103 inserted into the engine unit side mount member 102 (core bar 111). Here, as shown in FIG. 8, a gap S <b> 1 is formed over the entire circumference between the outer peripheral surface of the cushion member 103 and the inner peripheral surface of the annular ring 106, and the upper surface of the flange 116 of the cushion member 103 and the annular ring 106. A gap S <b> 2 is provided between the lower end surface of each other. These gaps S1 and S2 are sized to allow only a predetermined amount of displacement in the horizontal and vertical directions of the engine unit 14 (engine unit side mount member 102) relative to the vehicle body frame 2 (frame side mount member 101), for example, several It is set to about millimeters.

  The upper engine mount 86 is disposed at the upper part of the cylinder assembly 32 and in the vicinity of the side surface on the offset side (left side) of the cylinder assembly 32. The frame side mounting member 101 constituting the upper engine mount 86, and the engine unit side mount The member 102 and the cushion member 103 are all provided so as to be able to be assembled from the side of the vehicle (here, the left side), and contribute to the improvement of vehicle maintainability.

  When the saddle riding type vehicle 1 travels on a paved road or a little rough terrain, the engine unit 14 does not swing greatly with respect to the vehicle body frame 2. The vibration of the engine unit 14 is absorbed by the elasticity of the mount rubber 91 of the lower engine mount 85 and is supported by the frame 2 in a vibration-proof manner. For this reason, vibration is not transmitted to the body frame 2 side.

  On the other hand, when the saddle riding type vehicle 1 travels at high speed on rough rough terrain, jumps landing, sudden cornering, sudden acceleration / deceleration, etc., the engine unit 14 is driven by the inertial force due to its own weight or driving reaction force. When the upper part of 14 is displaced more than a predetermined amount with respect to the vehicle body frame 2, the cushion member 103 inserted into the core rod 111 of the engine unit side mount member 102 in the upper engine mount 86 and the annular ring of the frame side mount member 101 The gaps S <b> 1 and S <b> 2 provided between the engine unit 106 and the upper surface of the engine unit 14 are prevented from being displaced with respect to the vehicle body frame 2.

  Therefore, engine accessory parts such as the air cleaner 39, the exhaust pipe 42, and the exhaust muffler 43 due to excessive displacement of the upper portion of the engine unit 14 with respect to the vehicle body frame 2 are subjected to repeated loads due to the displacement of the engine unit 14. The fear of breakage can be eliminated.

  In addition, since the upper engine mount 86 having a very simple structure suppresses a large displacement of the upper part of the engine unit 14, the elastic constant (hardness) of the mount rubber 91 of the lower engine mount 85 is reduced correspondingly, and the pavement road surface travels. The vibration absorbability of the engine unit 14 at times can be improved to reduce rider's body vibration, and as a result, the riding comfort of the saddle riding type vehicle 1 can be remarkably improved by a simple structure.

  And the fuel supply apparatus which concerns on this invention is comprised as follows.

  As described above, the fuel tank 17 is provided below the seating seat 15 and behind the engine unit 14, and the fuel tank 17 is disposed on the opposite side of the exhaust pipe 42 and the exhaust muffler 43 constituting the exhaust device, that is, on the left side of the vehicle body. Has been placed.

  As shown in FIG. 3, the fuel pipe 17 and the exhaust pipe 42 and the exhaust muffler 43 constituting the exhaust device project in a vehicle plan view so as to protrude outward in the vehicle width direction from the left and right upper pipes 3 of the vehicle body frame 2, respectively. The fuel tank 17 is shaped so as to bulge to the exhaust device side (right side) beyond the vehicle center line C.

  A fuel pump 121 is housed and installed inside the fuel tank 17. An upper portion of the fuel pump 121 is exposed from the upper surface of the fuel tank 17, and a fuel outlet 122 is provided in this portion. Both the fuel outlet 122 and the throttle body 37 of the engine unit 14 are disposed between the left and right upper pipes 3 and 3 of the vehicle body frame 2 at substantially the same height as the upper pipe 3.

  As described above, the cylinder assembly 32, the crankcase 31, the transmission device 29, and the fuel tank 17 are sequentially overlapped in a substantially V shape when viewed from the side of the vehicle, but both front and rear upper ends of the V-shaped space formed therebetween. A throttle body 37 and a fuel outlet 122 are arranged in the vicinity of each part.

  The fuel outlet 122 is disposed inside the upper pipe 3 on the opposite side (left side) of the exhaust device in a plan view of the vehicle, and the fuel pipe connection portion 123 of the throttle body 37 is also shifted to the same side as the fuel outlet 122. Yes. The fuel pipe connection portion 123 is provided at a position slightly higher than the fuel outlet 122.

  The fuel outlet 122 and the fuel pipe connection portion 123 are connected by a fuel pipe 124 such as a flexible rubber hose. The fuel pipe 124 is disposed between the left and right upper pipes 3 and 3 of the vehicle body frame 2 at a height substantially equal to the upper pipe 3 in the front-rear direction, and is straight along the inside of the left upper pipe 3. Are arranged.

  A pair of tongue-shaped pipe holding shapes 125 facing each other are integrally formed on the lower surface of the air cleaner 39 disposed so as to protrude above the upper pipe 3 as shown in FIGS. The fuel pipe 124 is sandwiched and held by the pipe holding shape 125. Thus, the fuel pipe can be held with a simple structure without providing a dedicated holding member.

  The above-described upper engine mount 86 functions as a relative position restricting means between the upper portion of the engine unit 14 and the vehicle body frame 2. The upper engine mount 86 is located on the outer side of the throttle body 37 (here, the left side). The fuel pipe 124 is disposed between the upper engine mount 86 and the throttle body 37.

  Note that a breather port 126 is formed on the upper surface of the fuel tank 17 obliquely to the left of the fuel outlet 122, and a fuel filler port 127 is further provided on the rear side.

  In the fuel supply apparatus configured as described above, the fuel pipe 124 that connects between the fuel outlet 122 of the fuel tank 17 and the fuel pipe connecting portion 123 of the throttle body 37 provided at the upper part of the engine unit 14 includes: Since the engine unit 14 and the exhaust device (the exhaust pipe 42 and the exhaust muffler 43) are disposed at locations far away from the heat source that generates high heat, the thermal influence on the fuel pipe 124 is reduced and percolation is achieved. Generation and material deterioration can be effectively prevented.

  Moreover, since the fuel pipe 124 is a straight pipe that does not meander in the vertical and horizontal directions, the fuel pipe 124 can be formed simply and inexpensively using a straight pipe hose material. In addition to the fact that the fuel pipe 124 is a straight pipe in this way, the downstream end (throttle body 37 side) of the fuel pipe is higher than the upstream end (fuel tank 17 side), so that the flow of fuel and air The fuel supply efficiency can be improved.

  The fuel tank 17 is installed inside the vehicle body frame 2 and behind the engine unit 14, and the fuel tank 17 and the exhaust devices (42, 43) are more outward in the vehicle width direction than the left and right upper pipes 3 in a plan view of the vehicle. The fuel tank 17 is disposed so as to swell over the vehicle center line C to the exhaust device (42, 43) side, so that the heat effect on the fuel tank 17 is reduced and the fuel tank 17 Capacitance can be secured to the maximum, and parts layout inside the vehicle can be improved.

  Since the fuel pipe 124 is disposed between the throttle body 37 and the upper engine mount 86 provided near the outside of the throttle body 37, the fuel pipe 124 is located in a place where the displacement amount of the engine unit 14 with respect to the vehicle body frame 2 is the smallest. As a result, displacement of the fuel pipe 124 can be prevented and durability can be improved. Furthermore, the fuel pipe 124 can be protected and the durability can be improved in that the fuel pipe 124 is disposed inside the upper pipe 3 of the vehicle body frame 2.

  In addition, the cylinder assembly 32, the crankcase 31, the transmission device 29, and the fuel tank 17 of the engine unit 14 and the fuel tank 17 are sequentially overlapped without being separated from each other and viewed in a side view of the vehicle. Since the battery 35 is disposed in the inner space, the fuel tank 17 and the battery 35 can be brought close to the center of gravity of the vehicle body to improve running stability, and the fuel pipe 124 can be moved away from the engine unit 14 that is a heat source.

  Since the engine unit 14 and the fuel tank 17 are mounted below the upper pipe 3 of the vehicle body frame 2, the center of gravity of the vehicle can be lowered.

The left side perspective view showing an example of a saddle riding type vehicle to which the present invention is applied. 1 is a left side view of a vehicle body frame, an engine unit, and a fuel tank showing an embodiment of the present invention. The top view by the III arrow of FIG. FIG. 4 is a cross-sectional view of the engine unit developed along line IV-IV in FIG. 2. FIG. 5 is a cross-sectional view of the lower engine mount along the line V-V in FIG. 2. An enlarged left side view near the upper engine mount. A left side view of the upper engine mount alone. FIG. 8 is a longitudinal sectional view of the upper engine mount along the line VIII-VIII in FIG. 7. The bottom view of an air cleaner.

Explanation of symbols

1 straddle-type vehicle 2 body frame 3 upper pipe 11 front wheel 12 rear wheel 14 engine unit 17 fuel tank 28 engine body 29 transmission 31 crankcase 32 cylinder assembly 35 battery 37 throttle body 39 as air-fuel mixture generating means air cleaner 42 exhaust Exhaust pipe 43 constituting the device Exhaust muffler 49 constituting the exhaust device Crankshaft 86 Upper engine mount 121 as a relative position regulating means Fuel pump 122 Fuel outlet 123 Fuel pipe connection 124 Fuel pipe 125 Pipe holding shape C Vehicle center line

Claims (7)

The front and rear wheels are arranged at the front and rear portions of a vehicle body frame that includes a pair of left and right upper pipes extending substantially horizontally in the vehicle front-rear direction, and the engine is positioned between the front and rear wheels and below the upper pipe. The unit is mounted on a vehicle body frame, the exhaust unit of the engine unit is disposed below the upper pipe and on one side in the vehicle width direction, a fuel tank is disposed behind the engine unit and on the opposite side of the exhaust unit, and the fuel A fuel pump is accommodated in the tank and a fuel outlet is provided at the upper part of the fuel tank. On the other hand, a cylinder assembly of the engine unit is tilted forward, and an air-fuel mixture generating means and an air cleaner are connected to the upper part. Set the air-fuel mixture generating means to the same height as the upper pipe between the left and right upper pipes. The air cleaner is disposed so as to protrude above the upper pipe, and the fuel outlet and the fuel pipe connecting portion of the air-fuel mixture generating means are connected by a flexible fuel pipe. A fuel supply device for a saddle-ride type vehicle, characterized in that fuel piping is disposed between the left and right upper pipes at a height substantially equal to that of the upper pipes in a substantially horizontal direction. The exhaust device and the fuel tank are disposed so as to protrude outward in the vehicle width direction from the left and right upper pipes of the body frame, and the fuel tank bulges toward the exhaust device over the vehicle center line in a plan view of the vehicle. The fuel supply device for a saddle-ride type vehicle according to claim 1, wherein the fuel tank is arranged to do so. The fuel outlet is disposed inside the upper pipe on the opposite side of the exhaust device in a plan view of the vehicle, and the fuel pipe connecting portion of the air-fuel mixture generating means is shifted to the same side as the fuel outlet, and the fuel pipe The fuel supply device for a saddle-ride type vehicle according to claim 1, wherein the fuel supply device is disposed along an inner side of an upper pipe opposite to the exhaust device. The fuel supply device for a saddle-ride type vehicle according to claim 3, wherein the fuel pipe connection portion is provided at a position higher than the fuel outlet. Relative position restricting means for restricting relative position change with respect to the vehicle body frame on the upper part of the engine unit is provided near the outside of the air-fuel mixture generating means, and the fuel pipe is provided between the relative position restricting means and the air-fuel mixture generating means. The fuel supply device for a saddle type vehicle according to any one of claims 1 to 4, wherein the fuel supply device is provided. The straddle-type vehicle according to any one of claims 1 to 5, wherein the fuel pipe is disposed so as to pass under the air cleaner, and a pipe holding shape for holding the fuel pipe is integrally formed on a lower surface of the air cleaner. Fuel supply device. A front wheel and a rear wheel are arranged at the front and rear portions of a vehicle body frame that extends substantially horizontally in the vehicle longitudinal direction, an engine unit is mounted between the front and rear wheels, and a fuel tank is arranged behind the engine unit. The cylinder assembly, crankcase, and transmission that make up the engine unit, and the fuel tank are arranged so as to overlap each other without being separated from each other, and are arranged in a substantially V-shape, and a battery is arranged in the V-shaped inner space. On the other hand, the air-fuel mixture generating means of the engine unit and the fuel outlet of the fuel tank are respectively arranged near both upper ends of the V-shaped space, and the fuel pipe is substantially horizontal between the air-fuel mixture generating means and the fuel outlet. A fuel supply device for a saddle-ride type vehicle, characterized by being connected to

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