Fuel tank structure of straddle vehicle

Abstract

A fuel tank structure of a straddle vehicle includes a fuel tank which accumulates fuel supplied from a fuel filler port, a fuel tray which is provided above the fuel tank so as to surround the fuel filler port, and a gas-liquid separator which is connected to the fuel tank and separates the fuel into gas and liquid. The gas-liquid separator is spaced apart from the fuel tank and provided on the fuel tray.

Claims

1. A straddle vehicle comprising: a fuel tank structure, the fuel tank structure comprising: a fuel tank which accumulates fuel supplied from a fuel filler port; a fuel tray which is provided above the fuel tank so as to surround the fuel filler port; and a gas-liquid separator which is connected to the fuel tank and separates the fuel into gas and liquid, wherein the gas-liquid separator is spaced apart from the fuel tank and provided on the fuel tray, and a bottom surface of the gas-liquid separator is inclined at an angle different from that of a tank upper surface of the fuel tank.

2. The straddle vehicle according to claim 1, wherein the gas-liquid separator is a resin member integrally formed with the fuel tray.

3. The straddle vehicle according to claim 1, wherein the gas-liquid separator comprises: a breather pipe connection portion, to which a breather pipe leading to the fuel tank is connected, in a lower portion; and a purge pipe connection portion, to which a purge pipe leading to a canister is connected, in an upper portion.

4. The straddle vehicle according to claim 3, wherein a rising portion inclined toward an upper left side is provided in the bottom surface of the gas-liquid separator.

5. The straddle vehicle according to claim 1, wherein the fuel tank is covered with a cover member including a fuel lid which is openable and closable above the fuel tray, and the gas-liquid separator is arranged in a space between the fuel tank and the cover member.

6. The straddle vehicle according to claim 5, wherein a breather pipe for connecting the fuel tank and the gas-liquid separator is routed between the fuel tank and the cover member on a side of a tray portion of the fuel tray.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a left side view of a motorcycle according to an embodiment of a straddle vehicle according to the invention.

(2) FIG. 2 is a plan view of the motorcycle illustrated in FIG. 1 as viewed from above.

(3) FIG. 3 is a perspective view illustrating a state where a cover member above a fuel tank in the motorcycle illustrated in FIG. 1 is removed.

(4) FIG. 4 is a plan view of a fuel tray as viewed from above.

(5) FIG. 5 is a perspective view of the fuel tray as viewed obliquely from a front upper left side.

(6) FIG. 6 is a front view of the fuel tray as viewed from the front side.

(7) FIG. 7 is a cross-sectional right side view taken along a line A-A of FIG. 2 in a state where the cover member is mounted.

(8) FIG. 8 is a cross-sectional rear view taken along a line B-B of FIG. 2 in the state where the cover member is mounted.

(9) FIG. 9 is an enlarged right side view of the motorcycle illustrated in FIG. 1 as viewed from the right side while passing through the cover member and a riding seat.

MODE FOR CARRYING OUT THE INVENTION

(10) Hereinafter, a motorcycle which is a straddle vehicle adopting a fuel tank structure according to an embodiment of the invention will be described with reference to FIGS. 1 to 9. In the following description, the drawings shall be viewed in a direction of reference signs and front and rear, left and right, and up and down are described in accordance with a direction viewed from a rider. Further, in the drawings, the front of the vehicle is indicated by Fr, the rear is Rr, the left is L, the right is R, the upper is U, and the lower is D.

(11) As illustrated in FIG. 1, a body frame 2 as a skeleton portion in a motorcycle 1 has a pair of right and left main frames 4 extending rearward and downward from a head pipe 3, a pair of pivot frames 5 extending downward from the main frame 4, a pair of lower frames 6 which extends downward from the head pipe 3 and extends rearward, and further, is connected with the lower portion of the pivot frame 5, a pair of seat frames 7 which extends obliquely upper-rearward from the pivot frame 5, a pair of rear lower frames 8 for supporting the seat frame 7 from the lower side, and a bag frame 9 for supporting a saddle bag 40 and the like which will be described below on the rear side of the rear lower frame 8.

(12) The head pipe 3 is attached to a top bridge 12t of a front fork 12 on which a front wheel FW is steerably mounted and a steering handle 18 is mounted on the top bridge 12t. In the body frame 2, a side stand 10 for supporting the vehicle body at the time of parking a vehicle is provided only on the left side of the lower portion at a substantially center portion in a front-rear direction of the vehicle, and a main stand 39 is installed further on the rear side from the side stand 10. Also, just in front of the side stand 10, a main step 20 on which a rider's foot is placed is installed so as to protrude to both the right and left sides (see FIG. 2).

(13) On the seat frame 7, a riding seat 17 on which a driver sits and a passenger seat 17p on which an additional rider sits are arranged so as to have steps in the front-rear direction. Also, a trunk box 41 is provided behind the passenger seat 17p.

(14) An engine E is mounted in a space surrounded by the main frame 4, the pivot frame 5, and the lower frame 6. An exhaust pipe 55 extending obliquely to the rear-lower side from the engine E further extends backward and is connected to a muffler 50. Further, a rear wheel RW is appropriately supported by the body frame 2 via a swing arm, a cushion unit, and the like (not illustrated). Saddle bags 40 are provided on both right and left sides of the rear wheel RW and the mufflers 50 are provided on the lower side of the saddle bag 40 so as to pinch the rear wheel RW.

(15) As illustrated in FIG. 3, a fuel tank 16 which is appropriately fixed to a cross member 5c and the like suspended across the main frame 4 and the pivot frame 5 is disposed above the engine E.

(16) The outer surface of a vehicle is appropriately covered with a cover member. Also referring to FIG. 2, a headlight HL is provided at the center of the front portion of the vehicle and a front cowl 46 is provided so as to cover the upper, lower, left, and right sides of the headlight HL. A front screen 47 is provided above the front cowl 46.

(17) A side cover 48 is provided behind the front cowl 46 so as to cover the sides of the main frame 4 and the fuel tank 16, and a top cover 70 is provided so as to cover the obliquely upper front side of the fuel tank 16. Further, a head cover 54 and the like for covering the side surface of the engine E and the like are provided below the front cowl 46.

(18) A rear portion of the exhaust pipe 55 and the muffler 50 are covered with an exhaust pipe cover 56 and the exhaust pipe cover 56 is provided with a guard body cover 13k covering a guard body 13 protruding from an opening portion. Further, the upper portion of the front wheel FW is covered with a front fender 19f and the upper portion of the rear wheel RW is covered with a rear fender 19r.

(19) As illustrated in FIG. 3, in the fuel tank 16, a fuel filler port 16h through which the fuel is filled is provided in the front portion of a tank upper surface 16s and a fuel tray 60 is provided so as to surround the fuel filler port 16h. Further, in FIG. 3, reference numerals and letters 16p indicate an oil inlet cap for sealing the fuel filler port 16h and reference numerals and letters 16u indicate a remaining fuel sensor. In the fuel tray 60, a gas-liquid separator 65 that is connected to the fuel tank 16 and separates the fuel into gas and liquid is integrally provided. A fuel pump 16np for supplying the fuel in the fuel tank 16 to the engine E is provided in the rear portion of the tank upper surface 16s so as to protrude into the tank.

(20) As illustrated in FIG. 4, the fuel tray 60 has a tray portion 60b which has a cup shape and is formed by a tray bottom surface portion 60bb and a side wall portion 60bt rising from the outer edge portion of the tray bottom surface portion 60bb and a tray opening 60h having a circular shape is provided in the tray bottom surface portion 60bb. Further, in the rear portion of the side wall portion 60bt, a drain connection portion 60m protrude right-rearward and downward. In the front portion of the side wall portion 60bt, a central guide portion 60k and a left guide portion 60j for holding a purge pipe 67 described below are respectively provided in the substantially central portion and the left side. Further, the gas-liquid separator 65 having a cylindrical shape is provided in the front portion of the fuel tray 60 on the opposite side (right side) to the left guide portion 60j with the central guide portion 60k interposed therebetween. In the drain connection portion 60m, surplus fuel is discharged to the lower portion of a vehicle body via a drain pipe 68.

(21) As illustrated in FIG. 5, the gas-liquid separator 65 is connected to the fuel tray 60 via a separator connection portion 60g. The fuel tray 60, the separator connection portion 60g, and a separator lower half portion 65d of the gas-liquid separator 65 are simultaneously formed by injection molding. In addition, the separator lower half portion 65d is covered with a separator upper half portion 65u and those are fixed by welding or bonding or the like to form an internal space BS having a predetermined volume (see FIGS. 7 and 8).

(22) As illustrated in FIG. 6, in the gas-liquid separator 65, a purge pipe connection portion 65f communicating with the uppermost portion of the internal space BS is provided in the separator upper half portion 65u so as to protrude to the lower left side from the front end portion. The gas-liquid separator 65 is connected to a canister (not illustrated) via a purge pipe 67 connected to the purge pipe connection portion 65f. In the separator lower half portion 65d, a breather pipe connection portion 65r communicating with the lowest portion of the internal space BS protrudes to the rear-lower side from the rear end portion. The gas-liquid separator 65 is connected to the fuel tank 16 via a breather pipe 66 connected to the breather pipe connection portion 65r (see FIG. 7). In this way, the volatile fuel is easily guided to the canister by allowing the purge pipe connection portion 65f to communicate with the uppermost part of the internal space BS, and the liquid fuel is easy to return to the fuel tank 16 by allowing the breather pipe connection portion 65r to communicate with the lowest portion of the internal space BS.

(23) Also, on the bottom surface 65b of the gas-liquid separator 65, a rising portion 65bd is provided so as to be inclined toward the upper left direction from the vicinity of the breather pipe connection portion 65r. The rising portion 65bd is formed by inclining the bottom surface 65b toward the upper left direction. When the bottom surface 65b is viewed from the lower side, it has a shape which is recessed upward as illustrated in FIG. 6.

(24) As illustrated in FIGS. 7 and 9, the gas-liquid separator 65 is supported by the fuel tray 60 via the separator connection portion 60g, and thus the gas-liquid separator 65 is arranged to be separated from the tank upper surface 16s of the fuel tank 16. Also, the bottom surface 65b of the gas-liquid separator 65 is inclined rearwardly and downwardly as illustrated in the drawings and is inclined at an angle different from that of the tank upper surface 16s inclined in the front downward direction just below the gas-liquid separator 65.

(25) As illustrated in FIG. 8, in the fuel tray 60, the fuel filler port 16h of the fuel tank 16 is inserted through the tray opening 60h and is fixed above the fuel tank 16 such that the periphery of the fuel filler port 16h is surrounded by the tray bottom surface portion 60bb and the side wall portion 60bt. Further, the upper portion of the fuel tray 60 is covered with a top cover 70 which is a cover member. The top cover 70 is provided with a fuel lid 70a which can be opened and closed corresponding to the fuel filler port 16h. In addition, the top cover 70 is provided with an opening wall surface 70b extending downward toward the inner side of the side wall portion 60bt of the fuel tray 60. A space SP is formed between the fuel tank 16 and the top cover 70 on the outside of the opening wall face 70b of the top cover 70 and the side wall portion 60bt of the fuel tray 60. The gas-liquid separator 65 is disposed in the space SP.

(26) As illustrated in FIG. 7, the above-described breather pipe 66 connecting the fuel tank 16 and the gas-liquid separator 65 is routed between the fuel tank 16 and the top cover 70, that is, the space SP, on the side of the tray portion 60b of the fuel tray 60. The purge pipe 67 is supported by the central guide portion 60k and the left guide portion 60j. Further, the purge pipe 67 is routed on the side wall portion 60bt of the fuel tray 60 and the front portion of the fuel tank 16 and is connected to the canister (not illustrated).

(27) Further, when the side stand 10 is raised at the time of vehicle parking, the vehicle body is inclined to the left side. In this case, the rising portion 65bd is provided, and thus the fuel in the gas-liquid separator 65 cannot stay on the left side of the bottom surface 65b and is returned from the breather pipe connection portion 65r to the fuel tank 16 through the breather pipe 66.

(28) Although an embodiment of the invention has been described above, the invention is not limited thereto and can be modified as appropriate. For example, in the embodiment described above, the gas-liquid separator 65 is configured to be integrally molded on the fuel tray 60, but it may not be provided by integral molding. Further, the position at which the gas-liquid separator 65 is provided is not limited to the embodiment described above and can be appropriately changed in consideration of the vehicle body structure. Also, the shape of the gas-liquid separator 65 and the fuel tray 60 is not limited to the embodiment described above.

(29) In the embodiment described above, a motorcycle is described, but the invention may be another straddle vehicle such as a tricycle or a four-wheeled vehicle.

DESCRIPTION OF REFERENCE NUMERALS AND CHARACTERS

(30) 1: motorcycle (straddle vehicle) 16: fuel tank 16s: upper surface 16h: fuel filler port 60: fuel tray 60b: tray portion 65: gas-liquid separator 65b: bottom surface 65bd: rising portion 65r: breather pipe connection portion 65f: purge pipe connection portion 66: breather pipe 67: purge pipe 70: top cover (cover member) 70a: fuel lid SP: space