JP2011255828A - Structure of fuel tank of motorcycle and method for mounting fuel tank of motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a fuel tank of a motorcycle, which secures sufficient capacity of a fuel tank, irrespective of the size of an air cleaner box.SOLUTION: The fuel tank structure 22 of a motorcycle 1 includes: an engine 5 installed on the lower side of a main frame 17; the fuel tank 23 formed substantially in an L-shape in a vehicle side view, and including a front swelling 62 that is disposed on the rear side of the engine 5 and extended in upper and lower directions of the vehicle and a lower half bottom 63 that is extended continuously from the lower side of the front swelling 62 to the rear side of the vehicle; and a seating seat 59 disposed in an upper part of the lower half bottom 63.

Description

  The present invention relates to a fuel tank structure for a motorcycle and a method for mounting a fuel tank for a motorcycle.

  In order to improve engine output, so-called supersport type motorcycles have a substantially straight intake path from the outlet tube (intake duct) that opens into the air cleaner box to the throttle body and intake port, and are substantially vertical. A system employing an intake system oriented in a direction (a so-called downdraft intake system) is known.

  A motorcycle equipped with a downdraft intake system includes a pair of left and right main frames or a pair of left and right tank rails, an engine mounted between the left and right main frames or the left and right tank rails, and the left and right main frames. Alternatively, a tank cover mounted so as to straddle between the left and right tank rails, an air cleaner box housed on the front side of the tank cover, and a fuel tank housed on the rear side of the tank cover are provided. The air cleaner box covers the upper part of the engine to form a downdraft intake system. The tank cover is generally disposed between the handle and the seat. (For example, refer to Patent Document 1).

JP 2004-314679 A

  In the conventional motorcycle, since the air cleaner box constituting the downdraft intake system covers the upper part of the engine, the size (volume) of the fuel tank accommodated in the tank cover together with the air cleaner box is limited.

  However, the tank cover cannot be extremely enlarged in consideration of the physique of the passenger.

  Therefore, an object of the present invention is to propose a fuel tank structure for a motorcycle that can sufficiently secure the volume of the fuel tank regardless of the size of the air cleaner box.

  Here, when the volume of the fuel tank is sufficiently secured and the volume of the fuel tank is increased, the assemblability when the fuel tank is mounted on the vehicle may be impaired.

  Therefore, an object of the present invention is to propose a method for mounting a fuel tank of a motorcycle that can be easily mounted on a vehicle.

  In order to solve the above problems, a fuel tank structure for a motorcycle according to the present invention includes a pair of left and right main frames extending in the front and rear of the vehicle, an engine mounted on the lower side of the main frame, and a side view of the vehicle. A front bulge portion that is formed in a substantially L shape, is arranged behind the engine and extends up and down the vehicle, and a lower half bottom portion that extends from the lower side of the front bulge portion and extends rearward of the vehicle. It has the fuel tank which has, and the seat seat arrange | positioned above the said lower half bottom part, It is characterized by the above-mentioned.

  The motorcycle fuel tank mounting method according to the present invention includes a pair of left and right main frames extending in the front-rear direction of the vehicle, a substantially L-shape when viewed from the side of the vehicle, and a front bulge and the front bulge. It has a lower half bottom portion that extends continuously from below the protruding portion, and is formed so as to be located behind the center of gravity of the fuel pump and a pair of left and right front concave portions formed to be disposed forward in the vehicle side view. A pair of left and right fuel tanks, a seat seat disposed above the lower half bottom portion, and a pair of left and right seats provided on the main frame and disposed inside the width of the fuel tank. A rail, a front fixing bracket provided on the main frame and sandwiched between the front recess, and a front recess and a rear recess of the fuel tank. An intermediate fixing bracket that can be freely inserted and removed so as to sandwich the starting end of the seat rail, a front fastening member that fastens the front fixing bracket to the front recess, and a center fixing bracket that raises the seat rail. A mounting method for a fuel tank of a motorcycle, comprising: a rear fastening member to be fastened to an end portion; and a rubber elastic body provided at a rear end portion of the seat rail with a gap in the rear recess. The fuel tank removed from the vehicle is brought close to the seat rail, the rear recess is pressed against the rubber elastic body, the fuel tank is tilted around the rear recess, and the front recess is fixed to the front. The front fixing bracket is temporarily fastened to the front recess by the front fastening member, and the rear recess is separated from the rubber elastic body. Serial by the rear fastening member temporarily fastening the intermediate portion fixing bracket to the start end of the seat rail, characterized in that the fastening of the front fastening member and the rear fastening member.

  Furthermore, the method for attaching the fuel tank of the motorcycle according to the present invention includes a pair of left and right main frames extending in the front and rear of the vehicle, and a substantially L-shape when viewed from the side of the vehicle. It has a lower half bottom portion that extends continuously from below the protruding portion, and is formed so as to be located behind the center of gravity of the fuel pump and a pair of left and right front concave portions formed to be disposed forward in the vehicle side view. A pair of left and right fuel tanks, a seat seat disposed above the lower half bottom portion, and a pair of left and right seats provided on the main frame and disposed inside the width of the fuel tank. A rail, a front fixing bracket which is provided on the main frame and is detachable so as to sandwich the front recess, and is provided between the front recess and the rear recess of the fuel tank. An intermediate fixing bracket that is detachable so as to sandwich the starting end portion of the seat rail, a front fastening member that fastens the front fixing bracket to the front recess, and a central fixing bracket that raises the seat rail. A mounting method for a fuel tank of a motorcycle, comprising: a rear fastening member to be fastened to an end portion; and a rubber elastic body provided at a rear end portion of the seat rail with a gap in the rear recess. The fuel tank removed from the vehicle is brought close to the seat rail, the rear concave portion is pressed against the rubber elastic body, the fuel tank is tilted around the rear concave portion, and the intermediate portion fixing bracket is attached to the seat The intermediate bracket is temporarily fastened to the starting end of the seat rail by the rear fastening member, and is fitted to the starting end of the rail. Part of the front fixing bracket temporarily fastened to the front recess by the front fastening member while spaced from the rubber elastic body, characterized in that the fastening of the front fastening member and the rear fastening member.

  ADVANTAGE OF THE INVENTION According to this invention, the fuel tank structure of the motorcycle which can fully ensure the volume of a fuel tank irrespective of the magnitude | size of an air cleaner box can be proposed.

  Further, according to the present invention, it is possible to propose a method for mounting a fuel tank of a motorcycle that can be easily mounted on a vehicle.

The right view which showed the motorcycle provided with the fuel tank structure which concerns on embodiment of this invention. 1 is a left side view showing a fuel tank structure of a motorcycle according to an embodiment of the present invention. 1 is a left side view showing a fuel tank structure of a motorcycle according to an embodiment of the present invention. 1 is a left side view showing a fuel tank structure of a motorcycle according to an embodiment of the present invention. The rear view which showed the fuel tank structure of the motorcycle which concerns on embodiment of this invention. The side view which showed the fuel tank of the fuel tank structure of the motorcycle which concerns on embodiment of this invention. The perspective view which showed the fuel tank of the fuel tank structure of the motorcycle which concerns on embodiment of this invention. The side view which showed the seat cowl and bottom cover of the fuel tank structure of the motorcycle concerning the embodiment of the present invention. 1 is a perspective view showing a seat cowl and a bottom cover of a fuel tank structure for a motorcycle according to an embodiment of the present invention. The side view which showed the bottom cover of the fuel tank structure of the motorcycle which concerns on embodiment of this invention. The perspective view which showed the bottom cover of the fuel tank structure of the motorcycle which concerns on embodiment of this invention. The side view which showed the attachment middle in the attachment method of the fuel tank of the motorcycle which concerns on embodiment of this invention. The side view which showed the attachment middle in the attachment method of the fuel tank of the motorcycle which concerns on embodiment of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a motorcycle fuel tank structure and a motorcycle fuel tank mounting method according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a right side view showing a motorcycle having a fuel tank structure according to an embodiment of the present invention.

  In describing the structure of the motorcycle 1, the solid arrow F in FIG. 1 is defined as the front, and the solid arrow R in FIG. 1 is defined as the rear. Further, the left hand side when viewed from the passenger of the motorcycle 1 is defined as the left side of the motorcycle 1 and the opposite side is defined as the right side of the motorcycle 1. Furthermore, the head side of the passenger of the motorcycle 1 is defined as the upper side of the motorcycle 1 and the opposite side is defined as the lower side of the motorcycle 1. The direction of each part constituting the motorcycle 1 is the same as that of the motorcycle 1.

  As shown in FIG. 1, a motorcycle 1 includes a vehicle body frame 2, an engine 5 mounted on the vehicle body frame 2, a steering mechanism 6 pivotally supported on the front end portion of the vehicle body frame 2, and a lower end portion of the steering mechanism 6. A front wheel 8 pivotally supported on the vehicle, a front wheel suspension device 11 provided on the steering mechanism 9, a swing arm 12 pivotally supported on the rear portion of the body frame 2 so as to be swingable in the vertical direction, and a rear end of the swing arm 12 And a rear wheel suspension device 15 connected between the vehicle body frame 2 and the swing arm 12.

  The body frame 2 is of a twin tube type, for example. The vehicle body frame 2 includes a head pipe 16 disposed at a front end, a pair of left and right main frames 17 that expands in the left-right direction immediately after the head pipe 16 and extends obliquely rearward and downward to serve as a tank rail, and a main frame 17 is provided with a pair of left and right center frames 18 integrally connected to the rear end portion of the main frame 17 and extending substantially downward, and a pair of left and right seat rails 19 extending obliquely rearward and upward from the rear end portion of the main frame 17.

  The head pipe 16 pivotally supports the steering mechanism 6 via a built-in steering shaft (not shown). The center frame 18 supports a pivot shaft 21 installed at a substantially central portion in the longitudinal direction. The pivot shaft 21 pivotally supports the swing arm 12.

  The main frame 17 and the seat rail 19 support the fuel tank 23 constituting the fuel tank structure 22 from below.

  The engine 5 is disposed at the lower center of the motorcycle 1, more specifically below the main frame 17, and is connected to the engine intake system 25 and the engine exhaust system 26. The engine 5 includes a single cylinder engine, a parallel two cylinder engine, a parallel six cylinder engine, a V-type two-cylinder engine, a V-type four-cylinder engine, and a V-type six in addition to a parallel four-cylinder engine that is a four-cycle multi-cylinder engine. A cylinder engine is used as appropriate. The output of the engine 5 is transmitted to a rear wheel 13 via a driven sprocket (not shown) from a chain (not shown) constituting a secondary reduction mechanism (not shown).

  The engine 5 includes a cylinder assembly 5a including a cylinder having a fuel chamber (not shown), a valve mechanism (not shown), a cylinder head having an intake / exhaust port (not shown), and a crankshaft (not shown). And a crank assembly 5b having a transmission (not shown).

  The engine intake system 25 includes a throttle body 27 disposed above the engine 5 and an air cleaner box 28 disposed above the throttle body 27. The engine intake system 25 is a so-called downdraft system in which an intake path from an outlet tube (not shown) opened in the air cleaner box 28 to the throttle body 27 and the intake port is configured in a substantially straight line and oriented in a substantially vertical direction. This is the intake system.

  The engine exhaust system 26 includes an exhaust pipe 29 that extends downward from the front of the engine 5 to the rear of the motorcycle 1, and a muffler that is disposed on both sides of the motorcycle 1 in the vehicle width direction and connected to the exhaust pipe 29. 31. The muffler 31 extends from near both sides of the rear wheel 13 toward the upper rear side of the motorcycle 1.

  The steering mechanism 6 is pivotally supported by the head pipe 16 and the steering shaft so as to be rotatable in the left-right direction of the motorcycle 1. The steering mechanism 6 includes a steering head 33 pivotally supported on a steering shaft, a pair of left and right front forks 34 provided on the steering head 33, and a pair of handle bars provided near the upper end of the front fork 34 or on the steering head 33. 35. The left and right handlebars 35 each include a handle grip 36. A handle grip 36 disposed on the right side of the motorcycle 1 is a throttle grip 37.

  The front wheel 8 is steered so as to be rotatable left and right by a handle bar 35 of the steering mechanism 6. The front wheel 8 includes a front wheel 42 that is pivotally supported on the front fork 34 by a front wheel axle 41, a front tire 43 that is attached to the outer periphery of the front wheel 42, and a fastening member such as a bolt (not shown). And a front wheel brake plate 45 fixed by (omitted).

  The front end portion of the swing arm 12 is pivotally supported by a pivot shaft 21 provided substantially at the center in the vertical direction of the center frame 18.

  The rear wheel 13 includes a rear wheel 48 that is pivotally supported on the swing arm 12 by a rear wheel axle 47, a rear wheel tire 49 that is attached to the outer periphery of the rear wheel 48, and a bolt or the like attached to the rear wheel 48. A rear wheel brake plate (not shown) fixed by a fastening member (not shown).

  The rear wheel suspension device 15 is a shock absorber that cushions the swing arm 12 so as not to be transmitted to the vehicle body frame 2 due to the unevenness of the road surface caught by the rear wheel 13, and presses the rear wheel 13 against the road surface. It also functions.

  The motorcycle 1 is covered with a streamlined cowling 53 from at least a part of the vehicle, for example, from the front to the lower center. The cowling 53 reduces the air resistance during the traveling of the motorcycle 1 and protects the rider from the traveling wind pressure. The cowling 53 is connected to the front cover 55 covering the front of the vehicle, a pair of left and right side covers 56 covering the sides of the engine 5, an air cleaner box cover 57 covering the air cleaner box 28, and the air cleaner box cover 57. And a seat cowl 58 that covers the fuel tank 23 and covers the rear of the vehicle. The seat cowl 58 supports the seating seat 59.

  2 to 4 are left side views showing a fuel tank structure of a motorcycle according to an embodiment of the present invention.

  FIG. 3 is a view obtained by removing the seat cowl 58 and the seating seat 59 from FIG. 4 is a view in which the seat cowl 58, the seating seat 59, and the bottom cover 61 are removed from FIG.

  FIG. 5 is a rear view showing the fuel tank structure of the motorcycle according to the embodiment of the present invention.

  As shown in FIGS. 2 to 5, the fuel tank structure 22 of the motorcycle 1 includes a pair of left and right main frames 17 extending in the front-rear direction of the vehicle, an engine 5 mounted on the lower side of the main frame 17, and a vehicle side surface. A front bulging portion 62 that is formed in a substantially L shape in view and extends behind the engine 5 and extends in the vertical direction of the vehicle, and a lower half bottom portion that extends from the lower side of the front bulging portion 62 to the rear of the vehicle. A fuel tank 23 having a seat 63 and a seat 59 disposed above the fuel tank 23.

  The fuel tank structure 22 includes a pair of left and right seat rails 19 provided on the main frame 17 to support the fuel tank 23 from below the fuel tank 23 and disposed inside the width of the fuel tank 23.

  Further, the fuel tank structure 22 is sandwiched between a front fixing bracket 65 provided on the main frame 17 and supporting the fuel tank 23 on the main frame 17, and a starting end portion of the seat rail 19 provided on the fuel tank 23. An intermediate fixing bracket 66 that supports the seat rail 19, a front fastening member 67 that fastens the front fixing bracket 65 to the fuel tank 23, and a rear fastening member 68 that fastens the intermediate fixing bracket 66 to the seat rail 19. And a rubber elastic body 69 provided at the rear end portion of the seat rail 19.

  Furthermore, the fuel tank structure 22 includes a seat cowl 58 that covers a part of the fuel tank 23, and a bottom cover 61 that covers the fuel tank 23 together with the seat cowl 58.

  The main frame 17 is a frame that is inclined so that the front side of the vehicle becomes higher and extends in the front and rear of the vehicle, and supports the air cleaner box 28 above the engine 5 and on the front side of the fuel tank 23.

  The fuel tank 23 is formed using an aluminum alloy, and is disposed behind the engine 5 and extends up and down the vehicle. The fuel tank 23 extends from the front of the front bulge 62 to the rear of the vehicle. A lower half bottom 63. The front half of the front bulge 62 and the lower half bottom 63 is supported near the rear end of the main frame 17, and the rear half of the lower half bottom 63 is supported by the seat rail 19.

  The front bulging portion 62 has an outer surface smoothly connected to the rear end portion of the air cleaner box cover 57 that covers the air cleaner box 28, and is smooth so that the joint between the front bulging portion 62 and the air cleaner box cover 57 is not conspicuous. Connected to.

  The lower half bottom portion 63 extends rearward of the vehicle and is buried under the seating seat 59. Further, the lower half bottom portion 63 has an upper surface wall 63a that is inclined so that the front side of the vehicle is low and becomes high toward the rear, and a bottom wall 63b that is lowest at the substantially central portion in the front-rear direction. The bottom wall 63b of the lower half bottom portion 63 includes a fuel pump 71 provided at a substantially central portion in the front-rear direction that is rearward of the front bulging portion 62 in a plan view of the vehicle and lowest in a side view of the vehicle. . The fuel pump 71 is accommodated in the fuel tank 23 and supported by the bottom wall 63b.

  The fuel tank 23 includes a pair of left and right front recesses 72 that are arranged at the front in a side view of the vehicle, and a pair of left and right rear recesses 73 that are formed behind the center of gravity of the fuel pump 71. Have. Since the center of gravity of the fuel tank 23 formed in an L shape exists on the front bulging portion 62 side, the rear recess 73 is disposed behind the center of gravity of the fuel pump 71 and the fuel tank 23 as a whole. Will be.

  The front recess 72 is positioned below the front bulge 62 and is formed by recessing the side wall 63c of the lower half bottom 63.

  The rear recess 73 is disposed above the rubber elastic body 69 of the seat rail 19 and is formed by recessing the corner portions of the side wall 63c and the bottom wall 63b of the lower half bottom 63.

  The front fixing bracket 65 detachably sandwiches the front recess 72 of the fuel tank 23 to support the fuel tank 23 on the main frame 17.

  The intermediate portion fixing bracket 66 supports the fuel tank 23 on the seat rail 19 by detachably sandwiching the starting end portion of the seat rail 19.

  The rubber elastic body 69 is disposed below the rear recessed portion 73 of the fuel tank 23 while leaving a gap in the rear recessed portion 73.

  The seating seat 59 is disposed above the lower half bottom portion 63 and is integrally fixed to the fuel tank 23 via the seat cowl 58.

  The seat rail 19 is a frame that extends from the front end connected to the rear end of the main frame 17 to the rear end that sandwiches the fuel pump 71 in a plan view of the vehicle.

  The seat cowl 58 is fixed to the fuel tank 23 and covers the top wall 63a and the side wall 63c and extends rearward of the vehicle.

  The bottom cover 61 is fixed to the fuel tank 23 and covers the bottom wall 63b and the side wall 63c. The bottom cover 61 shields the fuel pump 71 approaching the engine exhaust system 26 such as the exhaust pipe 29 and the muffler 31 from the radiant heat by the lower half bottom portion 63 of the fuel tank 23 sinking below the seating seat 59. The generation of bubbles in 71 is prevented.

  FIG. 6 is a side view showing a fuel tank of a motorcycle fuel tank structure according to an embodiment of the present invention.

  FIG. 7 is a perspective view showing a fuel tank of a fuel tank structure for a motorcycle according to an embodiment of the present invention.

  As shown in FIGS. 6 and 7, the fuel tank 23 of the fuel tank structure 22 includes, in addition to the front recess 72 and the rear recess 73, seat cowl fastening portions 75 and 76 that fix the seat cowl 58 to the fuel tank 23, Bottom cover fastening portions 77 and 78 for fixing the bottom cover 61 to the fuel tank 23.

  A pair of seat cowl fastening portions 75 and 76 and bottom cover fastening portions 77 and 78 are provided on the left and right.

  The seat cowl fastening portion 75 is disposed near the lower portion of the front bulging portion 62 of the fuel tank 23 and fixes the front side of the seat cowl 58. On the other hand, the seat cowl fastening portion 76 is disposed in the vicinity of the rear end of the lower half bottom portion 63 of the fuel tank 23 and fixes the rear side of the seat cowl 58.

  The bottom cover fastening portion 77 is disposed above the intermediate portion fixing bracket 66 and fixes the front side of the bottom cover 61. On the other hand, the bottom cover fastening portion 78 is disposed near the rear end of the lower half bottom portion 63 and fixes the rear side of the bottom cover 61.

  The bottom wall 63 b of the fuel tank 23 has a supply port 81 communicated with the fuel pump 71.

  FIG. 8 is a side view showing a seat cowl and a bottom cover of a fuel tank structure for a motorcycle according to an embodiment of the present invention.

  FIG. 9 is a perspective view showing a seat cowl and a bottom cover of a fuel tank structure for a motorcycle according to an embodiment of the present invention.

  As shown in FIGS. 8 and 9, the seat cowl 58 of the fuel tank structure 22 has an outer surface continuously connected to the lower end edge of the front bulging portion 62 of the fuel tank 23, and the lower half of the fuel tank 23. It extends toward the rear of the vehicle while covering the bottom 63. The seat cowl 58 is formed by narrowing a portion sandwiched between the thighs of the occupant narrower than other portions in consideration of the rider's legibility at the sitting position.

  FIG. 10 is a side view showing the bottom cover of the fuel tank structure of the motorcycle according to the embodiment of the present invention.

  FIG. 11 is a perspective view showing a bottom cover of a fuel tank structure for a motorcycle according to an embodiment of the present invention.

  As shown in FIGS. 10 and 11, the bottom cover 61 of the fuel tank structure 22 has an opening 82 through which the intermediate portion fixing bracket 66 fixed to the fuel tank 23 passes and an opening corresponding to the rear recess 73 of the fuel tank 23. 85. Further, the bottom cover 61 has a bottom surface that is partially expanded corresponding to the fuel pump 71.

  The fuel tank 23, the seating seat 59, the seat cowl 58, and the bottom cover 61 can be integrally attached to or removed from the vehicle, and these are first attached to the fuel tank 23 and then the seat. A cowl 58 is attached to the fuel tank 23 to be integrally formed.

  Next, a method for attaching the fuel tank 23 of the motorcycle 1 according to this embodiment will be described.

  FIG. 12 and FIG. 13 are side views showing how the fuel tank is attached in the motorcycle according to the embodiment of the present invention.

  FIG. 13 is a view obtained by removing the seat cowl 58 and the seating seat 59 from FIG.

  Here, generally, when the motorcycle 1 is serviced, it may be necessary to unload or load the fuel tank 23 from the body frame 2.

  By the way, compared with the conventional fuel tank in which the front-rear length is restricted by the distance between the seating seat and the handle grip, the fuel tank 23 provided with a portion that sinks into the seating seat 59 can have a longer front-rear length. However, in the method of simply holding the fuel tank 23 in the operator's arm and loading or unloading the fuel tank 23 from the body frame 2, the workability decreases as the fuel tank 23 becomes larger. Specifically, the operator has to position and fasten the fuel tank while holding the large fuel tank 23 on the arm for a long time.

  Therefore, in the method of attaching the fuel tank 23 of the motorcycle 1 according to the present embodiment, the fuel tank 23 removed from the vehicle is brought close to the seat rail 19 and the rear recess 73 of the fuel tank 23 is formed as a rubber elastic body of the seat rail 19. 69, the fuel tank 23 is tilted around the rear recess 73 (FIG. 13), and the front recess 72 of the fuel tank 23 is fitted to the front fixing bracket 65 of the main frame 17 to be positioned. 67, the front fixing bracket 65 is temporarily fastened to the front recess 72, and the rear fixing member 68 is used to fix the intermediate fixing bracket 66 of the fuel tank 23 to the starting end of the seat rail 19 while separating the rear recess 73 from the rubber elastic body 69. The front fastening member 67 and the rear fastening member 68 are finally fastened.

  More specifically, when the fuel tank 23 is brought close to the seat rail 19, the fuel tank 23 is handled integrally with the seating seat 59, the seat cowl 58 and the bottom cover 61.

  When the rear recess 73 of the fuel tank 23 is pressed against the rubber elastic body 69 of the seat rail 19, the rubber elastic body 69 passes through the opening 85 of the bottom cover 61 and is pressed against the rear recess 73.

  When the rear recess 73 is separated from the rubber elastic body 69, the fuel tank 23 is tilted around the front fastening member 67 that temporarily fastens the front fixing bracket 65 to the front recess 72, so that the rear recess 73 is rubber elastic. Separated from the body 69.

  Note that the method of attaching the fuel tank 23 of the motorcycle 1 according to the present embodiment includes a work order of temporary coupling between the front fixing bracket 65 and the front recess 72 and temporary fastening between the intermediate fixing bracket 66 and the seat rail 19. May be replaced.

  Specifically, in the method of attaching the fuel tank 23 of the motorcycle 1 according to the present embodiment, the fuel tank 23 removed from the vehicle is brought close to the seat rail 19, and the rear recess 73 of the fuel tank 23 is formed on the seat rail 19. The rubber tank 69 is pressed against the rubber elastic body 69, the fuel tank 23 is tilted around the rear recess 73 (FIG. 13), and the front recess 72 of the fuel tank 23 is fitted to the front fixing bracket 65 of the main frame 17 for positioning. The intermediate fixing bracket 66 is temporarily fastened to the starting end portion of the seat rail 19 by the fastening member 68, and the front fixing bracket 65 is temporarily attached to the front concave portion 72 by the front fastening member 67 while the rear concave portion 73 is separated from the rubber elastic body. The front fastening member 67 and the rear fastening member 68 may be fastened.

  Further, when the fuel tank 23 is loaded and unloaded from the vehicle body frame 2, the reverse procedure of the above mounting method can be performed.

  According to the fuel tank structure 22 of the motorcycle 1 according to the present embodiment, the so-called downdraft type engine intake system 25 can be configured by increasing the size of the air cleaner box 28 in front of the fuel tank 23 and above the engine 5. At the same time, the fuel tank 23 is allowed to bulge from the rear of the air cleaner box 28 to the lower side of the seating seat 59 to be submerged, so that a sufficient volume of the fuel tank 23 can be secured.

  In addition, according to the fuel tank structure 22 of the motorcycle 1 according to the present embodiment, the fuel tank 23 is supported by the seat rail 19 disposed below the fuel tank 23 and the seat 59 is supported by the fuel tank 23. Compared to a conventional motorcycle having a seat rail that directly supports a seating seat, the fuel tank 23 can be formed larger in the width direction (left-right direction) of the vehicle without being obstructed by the seat rail 19.

  Here, in the case of a conventional motorcycle having a seat rail that directly supports the seating seat, the distance between the pair of left and right seat rails arranged immediately below the seating seat is taken into consideration in consideration of the rider's footing. It cannot be expanded too much. Therefore, in a conventional motorcycle including a seat rail that directly supports the seating seat, the width of the lower space of the seating seat is regulated by the seat rail.

  Therefore, in the fuel tank structure 22 of the motorcycle 1 according to the present embodiment, the seat rail 19 is disposed below the fuel tank 23, so that the fuel tank 23 is not obstructed by the seat rail 19 in the vehicle width direction ( It can be formed large in the horizontal direction. Further, since the fuel tank structure 22 can be formed large in the width direction (left and right direction) of the vehicle without being obstructed by the seat rail 19, the front and rear length of the fuel tank 23 can be increased when a predetermined volume is ensured. Can be shortened.

  Furthermore, according to the fuel tank structure 22 of the motorcycle 1 according to the present embodiment, the fuel tank 23 is fixed to the starting end portion of the seat rail 19 via the intermediate portion fixing bracket 66, and the rear end portion of the seat rail 19 is Since the gap between the fuel tank 23 and the fuel tank 23 is increased, the support rigidity of the fuel tank 23 is increased, and even if the rear end portion (free end portion) of the seat rail 19 vibrates, the fuel tank 23 and the seat 59 In addition, vibration transmitted to the passenger can be minimized.

  Furthermore, according to the fuel tank structure 22 of the motorcycle 1 according to the present embodiment, the fuel tank 23 sinks below the seating seat 59 and the fuel pump 71 approaches the engine exhaust system 26 such as the exhaust pipe 29 or the muffler 31. The bottom cover 61 can block the fuel pump 71 from radiant heat and prevent the generation of bubbles in the fuel pump 71.

  Therefore, the fuel tank structure 22 of the motorcycle 1 according to the present embodiment can sufficiently secure the volume of the fuel tank 23 regardless of the size of the air cleaner box 28.

  By the way, since the motorcycle 1 is a so-called super sports type motorcycle, it may be used in competitions that run on the circuit for a long time. When a problem occurs in the fuel pipe or the like connecting the fuel tank 23 and the fuel injection device (not shown) during the race, the passenger returns the motorcycle 1 to the pit provided on the outer periphery of the circuit and It will be repaired. Repair work in such a case must be done quickly. However, if the procedure of removing the seat cowl first and then removing the fuel tank is required, as in conventional motorcycles, a great deal of time is wasted on visualizing, approaching, investigating, and repairing the fuel piping. become. Considering the assembly after repair, the wasted time further increases.

  Therefore, according to the method of attaching the fuel tank 23 of the motorcycle 1 according to this embodiment, the L-shaped fuel tank 23 is rotated with the rear recess 73 of the fuel tank 23 and the rubber elastic body 69 of the seat rail 19 as fulcrums. By tilting it, the fuel tank 23 that becomes larger than the fuel tank of the conventional motorcycle can be easily and quickly positioned and attached to the vehicle body frame 2 together with the seat cowl 58 with certainty. As a result, the fuel pipe can be quickly seen, approached, investigated, and repaired even in race situations.

  Therefore, according to the method for attaching the fuel tank 23 of the motorcycle 1 according to this embodiment, the fuel tank 23 can be easily mounted on the vehicle.

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 5 Engine 5a Cylinder assembly 5b Crank assembly 6 Steering mechanism 8 Front wheel 9 Steering mechanism 11 Front wheel suspension device 12 Swing arm 13 Rear wheel 15 Rear wheel suspension device 16 Head pipe 17 Main frame 18 Center frame 19 Seat rail 21 Pivot shaft 22 Fuel tank structure 23 Fuel tank 25 Engine intake system 26 Engine exhaust system 27 Throttle body 28 Air cleaner box 29 Exhaust pipe 31 Muffler 33 Steering head 34 Front fork 35 Handlebar 36 Handle grip 37 Throttle grip 41 Front wheel axle 42 Front wheel 43 Front wheel tire 45 Front wheel brake plate 47 Rear wheel axle 48 Rear wheel wheel 49 Rear wheel tire 53 Cowling 55 Front cover 56 Side cover 57 Air cleaner box cover 58 Seat cowl 59 Seating seat 61 Bottom cover 62 Front bulging part 63 Lower half bottom part 63a Top wall 63b Bottom wall 63c Side wall 65 Front part fixing bracket 66 Middle part fixing bracket 67 Front part fastening member 68 Rear fastening member 69 Rubber elastic body 71 Fuel pump 72 Front concave portion 73 Rear concave portion 75, 76 Seat cowl fastening portion 77, 78 Bottom cover fastening portion 81 Feed port 82 Opening 85 Opening

Claims (7)

A pair of left and right mainframes extending in front and rear of the vehicle;
An engine mounted on the lower side of the main frame;
The vehicle is formed in a substantially L shape when viewed from the side, and is disposed behind the engine and extends upward and downward of the vehicle, and continuously extends from below the front bulge and extends rearward of the vehicle. A fuel tank having a lower bottom half;
A fuel tank structure for a motorcycle, comprising: a seat seat disposed above the lower half bottom portion. The left and right seat rails provided on the main frame and supporting the fuel tank from below the fuel tank and disposed inside the width of the fuel tank are provided. Motorcycle fuel tank structure. A fuel pump provided in the lower half bottom;
The fuel tank for a motorcycle according to claim 2, wherein the seat rail extends from a front end connected to a rear end portion of the main frame to a rear end sandwiching the fuel pump in a plan view of the vehicle. Construction. The fuel tank has a pair of left and right front concave portions formed to be disposed forward in the side view of the vehicle, and a pair of left and right rear concave portions formed to be disposed rearward of the center of gravity of the fuel pump. And
A front fixing bracket provided on the main frame and sandwiching the front recess to support the fuel tank on the main frame;
An intermediate portion fixing bracket that is provided between the front recess and the rear recess of the fuel tank, sandwiches the starting end portion of the seat rail, and supports the fuel tank on the seat rail;
A front fastening member for fastening the front fixing bracket to the fuel tank;
A rear fastening member for fastening the central portion fixing bracket to the seat rail;
The fuel tank structure for a motorcycle according to claim 2 or 3, further comprising: a rubber elastic body provided at a rear end portion of the seat rail and disposed with a gap in the rear concave portion. 5. The automatic vehicle according to claim 1, further comprising a seat cowl fixed to the fuel tank and covering an upper surface and a side surface of the lower half bottom portion and extending rearward of the vehicle. Motorcycle fuel tank structure. A pair of left and right mainframes extending in front and rear of the vehicle;
The vehicle is formed in a substantially L shape in a side view of the vehicle, and has a front bulge portion and a lower half bottom portion extending continuously from below the front bulge portion, and is disposed in front of the vehicle in a side view. A fuel tank having a pair of left and right front recesses and a pair of left and right rear recesses formed rearward of the center of gravity of the fuel pump;
A seat seat disposed above the lower half bottom;
A pair of left and right seat rails provided on the main frame and disposed inside the width of the fuel tank;
A front fixing bracket that is provided on the main frame so as to sandwich the front concave portion; and
An intermediate fixing bracket that is provided between the front recess and the rear recess of the fuel tank and is detachable so as to sandwich the starting end of the seat rail; and
A front fastening member for fastening the front fixing bracket to the front recess;
A rear fastening member for fastening the central portion fixing bracket to the starting end portion of the seat rail;
A rubber elastic body provided at a rear end portion of the seat rail and disposed with a gap in the rear recess, and a mounting method for a fuel tank of a motorcycle,
Bringing the fuel tank removed from the vehicle closer to the seat rail and pressing the rear recess against the rubber elastic body;
Position the front recess by fitting the front recess to the front fixing bracket by tilting the fuel tank around the rear recess,
Temporarily fastening the front fixing bracket to the front recess by the front fastening member;
Temporarily fastening the intermediate portion fixing bracket to the starting end portion of the seat rail by the rear fastening member while separating the rear concave portion from the rubber elastic body,
A method for attaching a fuel tank of a motorcycle, wherein the front fastening member and the rear fastening member are fastened together. A pair of left and right mainframes extending in front and rear of the vehicle;
The vehicle is formed in a substantially L shape in a side view of the vehicle, and has a front bulge portion and a lower half bottom portion extending continuously from below the front bulge portion, and is disposed in front of the vehicle in a side view. A fuel tank having a pair of left and right front recesses and a pair of left and right rear recesses formed rearward of the center of gravity of the fuel pump;
A seat seat disposed above the lower half bottom;
A pair of left and right seat rails provided on the main frame and disposed inside the width of the fuel tank;
A front fixing bracket which is provided on the main frame and is detachable so as to sandwich the front recess,
An intermediate fixing bracket that is provided between the front recess and the rear recess of the fuel tank and is detachable so as to sandwich the starting end of the seat rail;
A front fastening member for fastening the front fixing bracket to the front recess;
A rear fastening member for fastening the central portion fixing bracket to the starting end portion of the seat rail;
A rubber elastic body provided at a rear end portion of the seat rail and disposed with a gap in the rear recess, and a mounting method for a fuel tank of a motorcycle,
Bringing the fuel tank removed from the vehicle closer to the seat rail and pressing the rear recess against the rubber elastic body;
The fuel tank is tilted around the rear recess, and the intermediate portion fixing bracket is fitted to the starting end portion of the seat rail and positioned,
Temporarily fastening the intermediate portion fixing bracket to the starting end portion of the seat rail by the rear fastening member,
Temporarily fastening the front fixing bracket to the front recess by the front fastening member while separating the rear recess from the rubber elastic body,
A method for attaching a fuel tank of a motorcycle, wherein the front fastening member and the rear fastening member are fastened together.

Images