JP2007224831A - Fuel supply device for motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce an inertia force when a body moves with a head pipe as a center by arranging a fuel pump forward. <P>SOLUTION: A cylinder 8 of an engine 7 is erected and a fuel tank 13 is arranged thereon. An intake air passage 43 extending obliquely upward is formed at a cylinder head 11 and a throttle body 18 is connected to the passage. A fuel pipe 40 is inserted in the fuel tank 13 from a bottom, and positioned on an extension of a cylinder axis line C1. A base 61 of the fuel pump 40 and a fuel injection nozzle 42 of a throttle body 18 are connected by a short fuel supply pipe 41. The inertia force when the body moves with the head pipe 2 as the center can be reduced by arranging the fuel pump 40 which is a heavy article. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a fuel supply device for a motorcycle, and more particularly to a device suitable for an off-road vehicle.

An engine having an upright cylinder is mounted, a fuel pump is inserted into the fuel tank located above the cylinder in an inverted state from the upper rear wall, and a fuel supply pipe extending from the fuel pump is connected to the fuel tank. There is a fuel supply device for a motorcycle that is piped along a tank and whose tip is connected to a fuel injection nozzle located below the fuel tank (see Patent Document 1).
JP 2005-170273 A

In motorcycles, by placing heavy objects as close to the head pipe as possible, the inertial force when the body moves around the head pipe can be reduced to realize agile body movement. It is hoped that. Such a configuration is particularly desirable for off-road motorcycles.
However, when the fuel pump is arranged as in the above-mentioned Patent Document 1, the relatively heavy fuel pump mounting position becomes the upper rear wall of the fuel tank, so that the fuel pump is far away from the head pipe. In addition, the center of gravity is increased, and the length of the fuel supply pipe connected between the fuel pump and the fuel injection nozzle is increased, and the weight is increased accordingly.
Accordingly, an object of the present invention is to make it possible to dispose the fuel pump as close to the head pipe as possible and to make the piping of the fuel supply pipe as short as possible.

In order to solve the above problems, the invention of claim 1 relating to a fuel supply device for a motorcycle includes:
A pair of left and right main frames extending downward from the head pipe that supports the front wheels, an engine disposed below the main frame, and a portion of the engine disposed above a cylinder extending upward from a crankcase of the engine. In a motorcycle with a fuel tank located between the left and right main frames,
The fuel tank includes a fuel pump, and the cylinder includes a vertical cylinder axis, and the fuel pump is disposed on an extension line in the cylinder axis direction.

According to a second aspect of the present invention, in the first aspect, an intake passage extending rearward from the upper portion of the cylinder is provided, a fuel injection nozzle is disposed in the intake passage, and the fuel injection nozzle and the fuel pump are connected to each other. They are connected by a fuel supply pipe, and fuel is supplied from the fuel pump to the fuel injection nozzle.

  According to the first aspect of the present invention, the fuel tank partially disposed between the main frames extending from the head pipe in a pair of left and right is disposed above the cylinder in which the cylinder axis extends in the vertical direction. Since the built-in fuel pump is arranged on the extension line in the cylinder axial direction, the heavy fuel pump can be arranged close to the vicinity of the head pipe. For this reason, the inertial force when the vehicle body moves around the head pipe can be reduced.

  Also, when driving, the front and rear of the vehicle body is moved up and down due to the unevenness of the road surface, but at this time the fuel pump is arranged near the engine, so heavy objects are concentrated near the center of the vehicle body, and as a result The inertial force can be reduced, and the vertical movement of the vehicle body can be reduced.

According to the invention of claim 2, since the fuel pump is located above the cylinder and the fuel injection nozzle is provided in the intake passage extending from the upper part of the cylinder toward the rear, the fuel pump and the fuel injection nozzle can be arranged close to each other. For this reason, the length of the fuel supply pipe connecting the fuel pump and the fuel injection nozzle can be shortened as much as possible, contributing to weight reduction.

  An embodiment will be described below with reference to the drawings. FIG. 1 is a side view of an off-road motorcycle to which the vehicle body frame structure of this embodiment is applied. The motorcycle body frame 1 includes a head pipe 2, a main frame 3, a center frame 4, a down frame 5 and a lower frame 6, which are connected in a loop shape, and an engine 7 is supported on the inside thereof. Yes. The engine 7 includes a cylinder 8 and a crankcase 9. The main frame 3, the center frame 4 and the lower frame 6 are provided in a pair of left and right, respectively, and the head pipe 2 and the down frame 5 are provided in one along the center of the vehicle body.

  The main frame 3 extends obliquely downward in a straight line above the engine 7 and is connected to the upper end portion of the center frame 4 extending in the vertical direction behind the engine 7. The down frame 5 extends obliquely downward in front of the engine 7 and is connected to the front end of the lower frame 6 at the lower end thereof. The lower frame 6 is bent from the lower front side of the engine 7 to the lower side of the engine 7 and extends rearward in a substantially linear shape, and is connected to the lower end of the center frame 4 at the rear end.

  A fuel tank 13 is disposed above the engine 7 and supported on the main frame 3. A seat 14 is disposed behind the fuel tank 13 and is supported on a seat rail 15 extending rearward from the upper end of the center frame 4. Reference numeral 16 denotes a reinforcing pipe disposed below the seat rail 15. An air cleaner 17 is supported on the seat rail 15 and the reinforcing pipe 16 and is sucked into the cylinder head 11 from the rear side of the vehicle body via the throttle body 18.

  From the front part of the cylinder 8, the exhaust pipe 20 is bent into a substantially S shape and extends downward, and is connected to a muffler 21 disposed in front of the crankcase 9. A tail pipe 22 extends rearward from the muffler 21 and crosses the center frame 4, and a rear end portion thereof is supported by the reinforcing pipe 16 at the rear thereof.

  A front fork 23 is supported on the head pipe 2, and a front wheel 24 supported on the lower end is steered by a handle 25. The center frame 4 is supported by a pivot shaft 26 so that the front end portion of the rear arm 27 is swingable. A rear wheel 28 is supported at the rear end of the rear arm 27 and is chain driven by the engine 7. A rear suspension cushion unit 29 is provided between the rear arm 27 and the rear end of the center frame 4.

  30 is a radiator, 31 is a rubber mount portion, 32 and 33 are engine mount portions, 34 is an engine hanger, and 35 is an electrical component case. The engine 7 is also supported on the center frame 4 by the pivot shaft 26.

  FIG. 2 is an enlarged side view of the engine and fuel supply system. The engine 7 is a water-cooled four-cycle type, and the cylinder 8 is provided at the front portion of the crankcase 9 in an upright state in which the cylinder axis C1 is substantially vertical, and the cylinder block 10, the cylinder head 11, A head cover 12 is provided. By making the cylinder 8 stand upright, the stroke of a piston (not shown) is lengthened and the longitudinal direction of the engine 7 is shortened to make the engine 7 suitable for off-road vehicles.

  A fuel tank 13 is disposed immediately above the cylinder 8. The fuel tank 13 has a space of about the stiffener portion 36 between its bottom and the top of the head cover 12. The stiffener portion 36 is an arm-shaped frame reinforcing member that connects the intermediate portion in the vertical direction of the down frame 5 and the rear portion of the main frame 3. A built-in fuel pump 40 is accommodated in the fuel tank 13.

  The fuel pump 40 is also disposed immediately above the cylinder 8 and is disposed so as to overlap an extension in the axial direction of the cylinder axis C1 that is the center of the cylinder 8 (the axis of the piston). The arrangement of the fuel pump 40 may move slightly in the front-rear direction as long as it partially overlaps the cylinder axis C1. Even in this case, the cylinders 8 are arranged so as to be within the front-rear width of the cylinder 8, that is, between the inner sides of the upper extension portions of the front-rear contour lines in side view. This arrangement allows the heavy fuel pump 40 to be located near the center of gravity W of the engine 7 in the longitudinal direction of the vehicle body. The center of gravity W of the engine 7 is positioned obliquely rearward and up close to the axis O of the crankshaft 9a.

  The fuel pump 40 is inserted inward from the bottom 13 a of the fuel tank 13, a fuel supply pipe 41 extends forward from a base portion 61, which is the bottom of the fuel pump 40, and bends backward to return to the fuel injection nozzle 42 of the throttle body 18. Connected to. The fuel injection nozzle 42 constitutes a known electronic fuel injection device. The fuel supply pipe 41 is a pipe that supplies high-pressure fuel from the fuel pump 40 to the fuel injection nozzle 42, and is curved relatively shortly between the bottom 13 a and the head cover 12 to the rear part of the cylinder head 11. It is piped, reducing fuel pressure loss and contributing to weight reduction.

  The throttle body 18 is connected to an intake passage 43 provided in the cylinder head 11 and extending obliquely upward. The fuel injection nozzle 42 is inserted obliquely into a socket provided on the side surface of the throttle body 18, and the tip injection port faces the intake passage 43 to inject fuel into the intake passage 43. Reference numeral 44 denotes an electric wire connector to which one end of the control electric wire 45 of the fuel injection nozzle 42 is connected.

  One end of a high tension cord 47, which is a high voltage electric wire for ignition, is connected to the abbreviated ignition plug 46 of the head cover 12, and a high voltage for ignition is applied. Reference numeral 48 denotes a drive wire for supplying drive power to the fuel pump 40. The other ends of these electric wires 45, 47 and 48 are connected to a capacitor 50 provided in the electrical component case 35. In the electrical component case 35, a regulator 51 and a fall switch 52 are accommodated in addition to the capacitor 50 as electrical components.

  The electrical component case 35 is supported by the center frame 4 on the left side at a position behind the cylinder 8 and above the crankcase 9 and at a position close to the cylinder 8. On the right side of the electrical component case 35, a stay 53 extending forward is connected to and supported by the tip of the engine hanger 34. Further, the tail pipe 22 extends rearwardly through the side of the electrical component case 35, and the rear end portion opens at a position behind the electrical component case 35 (see FIG. 1). For this reason, the electrical component case 35 is designed to effectively block heat from the cylinder 8 and exhaust heat from the electrical component.

  FIG. 3 is a partially cutaway side view of the fuel tank 13. The fuel pump 40 includes a main body portion 60 that enters the inside of the fuel tank 13 and a base portion 61 that is exposed downward from the bottom portion 13 a of the fuel tank 13. The main body portion 60 is inserted into the fuel tank 13 through an opening 13b provided in the bottom portion 13a, and the flange 62 of the base portion 61 is overlapped with the bottom portion 13a around the opening 13b from the lower side and fixed by a bolt 63. A joint pipe 64 connected to a discharge port (not shown) of the main body 60 extends forward, and one end of the fuel supply pipe 41 (FIG. 2) is connected to the base 61. Further, a connector 65 is provided, and an electric wire 48 for driving power is wired here.

  The fuel tank 13 has a substantially right-angled triangle shape in a side view, a substantially right-angled portion is located at the front lower portion, and the upper surface is a comparatively small-sized one that forms an obliquely downwardly inclined slope. Reference numeral 13c denotes a stepped portion that rides on the upper surface of the main frame 3, and reference numeral 13d denotes a mounting bracket. The lower part of the mounting bracket 13d is bolted to the upper part of the front surface of the side wall of the fuel tank 13, and the upper part is bolted to a gusset 37 (FIG. 2) formed integrally with the head pipe 2 and extending rearward. 13e is a tank cap.

  FIG. 4 is a bottom view of the fuel tank 13. The base 61 and the flange 62 have a substantially pentagonal shape, and are inserted into a recess 13 f provided in the bottom 13 a in the same shape, and at each apex of the flange 62. The bolt 63 is attached to the bottom portion 13a. The joint pipe 64 extends obliquely forward in the vicinity of the vehicle body center C0, and the connector 65 protrudes slightly to the rear side.

  The main frame 3 extends from the head pipe 2 to the left and right and extends rearward while expanding. Accordingly, the space surrounded by the head pipe 2 and the front portions of the left and right main frames 3 has a substantially acute triangular shape, and the shape of the bottom portion 13a of the fuel tank 13 accommodated therein also has a width toward the front head pipe 2. Narrow. The position where the base 61 of the fuel pump is provided is a position where the maximum width portion of the bottom portion 13a is used. Even if an attempt is made to move further forward from this position, the maximum width portion of the base 61 is the position of the bottom portion 13a. It will interfere with the narrowed part and cannot move substantially forward. For this reason, the illustrated position where the fuel pump is provided is a position where the fuel pump can be disposed at the foremost position under the restriction of the shape of the bottom portion 13a.

  FIG. 5 is a side view of the electrical component case 35. The electrical component case 35 includes a front wall 70, left and right side walls 71, and a bottom wall 72, and has a box shape opened upward and rearward. Brackets 73 that bend from the front wall 70 to the outer surfaces of the side wall 71 on the left side of the vehicle body are provided, and one end is attached to the front wall 70 and the other end is attached to the lower portion of the side wall 71 with rivets 74. The bracket 73 is detachably attached to a stay 38 provided on the upper portion of the center frame 4 by a nut portion 73a provided at an intermediate portion.

  Inside the electrical component case 35, a bracket 75 is provided at the top, and the capacitor 50 and the regulator 51 are supported side by side. An end portion of the bracket 75 located at the rear portion of the left side wall 71 forms an insertion portion 75a in which a step is formed, and a side portion of the capacitor 50 is locked here. Reference numeral 75b denotes locking protrusions formed before and after the insertion portion 75a.

  Capacitor 50 and regulator 51 constitute a battery-less power supply system, and AC current supplied from an AC generator (not shown) of the engine is converted to a constant voltage by regulator 51, converted to DC by capacitor 50, and DC current is supplied to each necessary part. Supply. When the vehicle falls, the fall sensor 52 cuts off the power supply from the AC generator to the regulator 51.

  A bracket 76 is also attached to the front lower wall 70 with a rivet 74 on the inner lower part of the electrical component case 35, and the fall sensor 52 is supported on the bracket 76, and is positioned below the regulator 51 in the vertical direction. When the vehicle tilts more than a predetermined angle, the fall sensor 52 detects the tilt and determines that the vehicle has fallen, and disconnects the circuit to the AC generator or the regulator 51.

  FIG. 6 is a top view of the electrical component case 35 (a view in the direction indicated by the arrow Y in FIG. 5). The bracket 75 bends in a substantially L shape, and the left side portion extends to the rear of the vehicle body to form an insertion portion 75a. The locking portion 50a provided on the side portion of the 50 is locked. The left rear portion of the side wall 71 of the electrical component case 35 extends rearward long so as to cover the side surface of the capacitor 50.

  The front portion of the bracket 75 is fixed to the left side of the front wall 70 with a rivet 74, the right end is separated rearward from the front wall 70, and the end of the regulator 51 is fixed here with bolts 77a and nuts 77b. A rear end portion of the stay 53 overlaps the outer surface of the side wall 51 on the right side of the vehicle body and is attached with a rivet 74.

  The bracket 76 is attached to the front wall 70 at the center, and the right end is bent and overlaps with the inside of the right side wall 71 of the electrical component case 35 and is secured by a rivet 74. At the portion along the front wall 70 of the bracket 76, the left and right ends of the fall sensor 52 disposed across the vehicle body center C0 are fixed by bolts 78a and nuts 78b.

  FIG. 7 shows a cross section of the capacitor 50 showing the structure of the locking portion 50a. The locking portion 50a is made of an elastic body such as rubber and is formed so as to protrude sideways from the side portion of the capacitor 50, and a slit 50b is provided through the slit 50b in the front-rear direction. When the insertion portion 75a is inserted into the slit 50b, the locking projection 75b goes outside while elastically deforming the slit 50b, and locks the end of the locking portion 50a. As a result, the capacitor 50 can be quickly installed simply by inserting it.

  8 to 11 show details of the fuel supply pipe 41. FIG. 8 is a plan view of the fuel supply pipe 41. The fuel supply pipe 41 is provided with connectors 80 and 81 at both ends, the connector 80 is connected to the joint pipe 64 (FIGS. 3 and 4) of the fuel pump from the front, and the connector 81 is also forward to the fuel injection nozzle 42 (FIG. 2). It comes to connect from. The connectors 80 and 81 are connected by a fuel hose that is bent in a substantially L shape. This fuel hose is divided into a front hose 82 and a rear hose 84, and can be connected and separated by an intermediate joint 83. The intermediate joint 83 is provided at the bent portion of the fuel hose. The front hose 82 is shorter than the rear hose 84.

The front hose 82 is disposed sideways in the left-right direction, one end is connected to the connector 80, and the other end is connected to the joint front part 85 constituting the intermediate joint 83.
The rear hose 84 is vertically arranged in the front-rear direction, the front end portion is connected to the joint rear portion 86 constituting the intermediate joint 83, and the rear end portion is connected to the connector 81. The joint front part 85 and the joint rear part 86 constitute an intermediate joint 83 together with the joint nut 87. Reference numeral 88 denotes a locking pin for preventing the removal. Reference numeral 89 denotes a clip that fastens and fixes the outer periphery of the end portion of the fuel hose.

  FIG. 9 is a cross-sectional view of the intermediate joint 83 portion (a cross-sectional view taken along line 9-9 in FIG. 8). The intermediate joint 83 is formed on the inner peripheral surface of the concave portion 87a of the joint nut 87, which is inserted into the concave portion 85a provided in the joint front portion 85 with the insertion shaft portion 86a of the joint rear portion 86 closely. The female screw 87b and the male screw 85b formed on the outer peripheral portion of the joint front portion 85 are fastened, and the lock pin 88 is inserted as described later to be connected in a retaining state.

  At this time, an annular groove 86c is formed in the outer peripheral portion of the insertion shaft portion 86a, and the inner peripheral surface of the recess 85a of the joint front portion 85 and the insertion shaft portion are fitted by the O-ring 93 fitted in the annular groove 86c. The joint portion with the outer peripheral surface of 86a is liquid-tightly sealed. A fuel passage 85 c is formed in the axial center portion of the joint front portion 85, and is connected coaxially to a fuel passage 86 d formed in the axial center portion of the rear hose 84.

  FIG. 10 is an exploded view of the intermediate joint 83. The joint nut 87 is a bottomed cylindrical body with the joint front portion 85 side opened, and a small hole 87d is provided in the bottom portion 87c. The joint rear portion 86 is previously inserted into the recess 87a from the open side of the joint nut 87, and the hose connection portion 86b is extended outward from the small hole 87d to connect the end portion of the rear hose 84. At this time, the flange part 86e formed in the boundary part of the insertion shaft part 86a and the hose connection part 86b is located in front of the bottom part 87c (on the joint front part 85 side) and can come into contact therewith.

  Therefore, if the insertion shaft portion 86a is inserted into the recess 85a of the joint front portion 85 and the female screw 87b of the joint nut 87 is fastened to the male screw 85b of the joint front portion 85, the space between the end portion of the joint front portion 85 and the bottom portion 87c. The flange 86e is clamped and integrated, and the joint rear portion 86 is prevented from coming off. Further, a lock pin 88 prevents the joint front portion 85 and the joint nut 87 from coming off.

11 shows a structure for preventing loosening and retaining, and shows a cross-section perpendicular to the axis of the joint nut 87 (cross section taken along line 11-11 in FIG. 10) and a lock pin 88 together.
As shown in the lower part of the figure, a through hole 90 is provided that partially crosses the outer circumference 87e of the recess 87a like a string. The portion crossing the outer circumference circle forms an exposed portion 92 that is opened into the recess 87a. The exposed portion 92 faces the annular groove 91 of the joint front portion 85 inserted into the recess 87a. The through holes 70 are formed at intervals of 120 degrees around the axis of the joint nut 87, and form an equilateral triangle when the through holes 90 are extended in the length direction.

The lock pin 88 shown in the upper part of the figure is a ring in which a straight straight portion 94 inserted into the through hole 90, an arc-shaped portion 95 overlapping the outer peripheral portion of the joint nut 87, and a portion opposite to each free end thereof are continuous. It consists of a shaped part 96. The ring-shaped portion 96 serves as a spring portion that performs elastic deformation when the arc-shaped portion 95 rides on the outer peripheral portion of the joint nut 87, and also serves as a gripping portion when the lock pin 88 is attached or detached.
The outer diameter of the lock pin 88 is the same as the inner diameter of the through hole 90 in the straight portion 94, and the straight portion 94 can be inserted into the through hole 90.

  When the straight portion 94 of the lock pin 88 shown in the upper part of the figure is inserted into the through hole 90 of the joint nut 87 shown in the lower part of the figure, the straight part 94 crosses the inside of the concave part 87 a at the exposed part 92. At this time, if the joint front portion 85 is fitted into the recess 87 a, a part of the straight portion 94 protruding from the exposed portion 92 is fitted into the annular groove 91, and the joint front portion 85 and the joint nut 87 are loosened. Stop and retain. At this time, the arc-shaped portion 95 overlaps the outer peripheral portion of the joint nut 87 and prevents the lock pin 88 itself from coming off from the joint nut 87.

In addition, by providing a plurality of through holes 90 having different angles when viewed from the axial direction of the joint nut 87, the lock pin 88 is most operated regardless of the position of the joint nut 87 around the axis. Can be attached and detached in an easy direction.
Therefore, it is possible to operate the intermediate joint 83 even in a narrow space where other parts are arranged close to each other around the intermediate joint 83. However, the number and angle of the through holes 90 can be freely set.

  As described above, the fuel supply pipe 41 is divided into the front and rear, and can be connected and separated by the intermediate joint 83. Therefore, when the fuel tank 13 is removed, the fuel pump 40 and the fuel injection nozzle 42 can be separated by the intermediate joint 33. Thus, the rear hose 84 on the side of the fuel injection nozzle 42 having a narrow working space can be left without being removed, so that the maintainability is improved. Further, when maintaining the fuel injection nozzle 42 side, the fuel supply pipe 41 is similarly separated by the intermediate joint 83, so that the work can be performed with the fuel tank 13 attached to the vehicle body side. improves.

  In addition, as shown in FIG. 2, the front lower side position of the fuel tank 13 has a relatively large space. Therefore, by arranging the intermediate joint 83 at this position, a work space with a sufficient space can be secured. Further, the front hose 82 and the rear hose 84 can be easily manufactured in a straight simple shape.

  Further, since the joint portion of the joint front portion 85 and the joint rear portion 86 is sealed by the O-ring 93, it is possible to maintain a good sealing property by simply replacing the O-ring 93 at the time of disassembling the intermediate joint 83. . Although the seal structure can be simplified by using the O-ring 93, the seal structure is not necessarily limited to the O-ring 93, and various shapes other than the O-ring 93 can be adopted as the seal member.

  Next, the operation of this embodiment will be described. As shown in FIG. 2, the fuel tank 13 is disposed above the upright cylinder 8, and the fuel pump 40 incorporated therein is disposed on the extension line in the axial direction of the cylinder axis C1. It can be placed close to the vicinity of the head pipe 2.

  In addition, when the fuel pump 40 is disposed forward in the fuel tank 13 with the width narrowing toward the front, the fuel tank 13 is restricted to the front as much as possible. In addition, since the cylinder axis C1 is close to the center of gravity W of the engine 7, the heavy fuel pump 40 can be disposed near the center of gravity W near the center of the vehicle body in the front-rear direction.

  For this reason, the front and rear of the vehicle body is moved up and down due to the unevenness of the road surface during traveling, but heavy objects can be concentrated at the center of the vehicle body, and the inertial force when the vehicle body moves around the head pipe 2 is reduced to reduce the vehicle body. The vertical movement of the front and rear can be reduced, and agile body movement can be realized. As a result, it is particularly suitable for off-road motorcycles.

  Furthermore, since the fuel pump 40 is inserted from the bottom of the fuel tank 13 and the base 61 is attached to the bottom 13a, the mounting position of the built-in fuel pump 40 can be made as low as possible, contributing to a lower center of gravity of the vehicle body. it can. In addition, the joint pipe 64 of the base 61 is located immediately above the head cover 12, and the fuel injection nozzle 42 is provided in the throttle body 18 connected to the intake passage 43 behind the cylinder head 11 in the vicinity thereof. Therefore, the fuel supply pipe 41 connecting the joint pipe 64 and the fuel injection nozzle 42 is as short as possible, and the piping structure can be simplified by simplifying the piping, and the relatively heavy fuel supply pipe 41 can be shortened. Therefore, it can contribute to reducing the weight of the car body.

  In addition, since the electrical component case 35 is disposed at a position behind the cylinder 8 and above the crankcase 9 and at the front of the center frame 4, the capacitor 50 and the regulator 51, which are heavy electrical components, are installed together with the overturn switch 52 together with the space efficiency. It can be arranged well and can concentrate the mass. Further, by opening the rear end of the tail pipe 22 behind the electrical component case 35, it is possible to avoid the thermal effects of the engine 7 and exhaust gas on these electrical components, and approach the cylinder 8 and move forward. Can be positioned.

In addition, these electrical components are arranged in the vicinity of the AC generator of the engine 7 that is the power generation source, the ignition plug 46 of the cylinder head 11 that is the connection destination, the connector 65 of the fuel pump 40, and the connector 44 of the fuel injection nozzle 42. Therefore, the wires 45, 47 and 48 can be shortened and efficiently wired.

Side view of motorcycle according to embodiment Enlarged side view of the engine and fuel supply system Partial cutaway side view of fuel tank Bottom view of fuel tank Side view of electrical component case Top view of electrical component case Cross section of capacitor Top view of fuel supply pipe Sectional view along line 9-9 in FIG. Exploded view of intermediate joint Sectional drawing which follows the 11-11 line of FIG.

Explanation of symbols

7: engine, 8: cylinder, 9: crankcase, 11: fuel supply pipe, 18: throttle body, 35: electrical component case, 40: fuel pump, 41: fuel supply pipe, 42: fuel injection nozzle, 43: intake air 50: condenser, 51: regulator, 52: fall sensor, 60: main body of fuel pump, 61: base of fuel pump, 83: intermediate joint, 93: O-ring

Claims (2)

A pair of left and right main frames extending downward from the head pipe that supports the front wheels, an engine disposed below the main frame, and a portion of the engine disposed above a cylinder extending upward from a crankcase of the engine. In a motorcycle with a fuel tank located between the left and right main frames,
The fuel tank has a built-in fuel pump, the cylinder has a cylinder axis in the vertical direction, and the fuel pump is disposed on an extension line in the cylinder axis direction. An intake passage extending rearward from the upper part of the cylinder is provided, and a fuel injection nozzle is disposed in the intake passage, and a fuel supply pipe is connected between the fuel injection nozzle and the fuel pump. The fuel supply device for a motorcycle according to claim 1, wherein fuel is supplied to the fuel injection nozzle.

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