JP2016013818A - Motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the capacity of a tank to be secured by effectively using a space below the bridge spanned between right and left seat rails.SOLUTION: A bridge 9 is spanned between right and left seat rails 3R, 3L which extend in the vehicle body longitudinal direction. The bridge 9 forms a portal shape which is constituted of leg parts 9b, 9b erected on the upper surfaces of the right and left seat rails 3R, 3L, and right and left direction extension parts 9a connecting the right and left leg parts 9b, 9b. At rear end portions of the right and left seat rails 3R, 3L, behind the bridge, fuel tank mounting brackets 20, 20 are provided protrudingly inward. A fuel tank 8 arranged between the right and left seat rails 3R, 3L is extended while passing the lower part of the bridge 9, and the rear part of the fuel tank 8 is fixed to the fuel tank mounting brackets 20, 20.

Description

  The present invention relates to a motorcycle in which a fuel tank is disposed between left and right seat rails.

  The scooter type motorcycle has a configuration in which the front of the seat enters the lower side and gets on and off using the space in front of the seat. In such a scooter type motorcycle, a fuel tank cannot be arranged at the front part of the vehicle body, and the fuel tank is arranged below the seat at the rear part of the vehicle body.

  As this type of technology, for example, in Patent Document 1, a storage box is disposed in front between the left and right seat rails, a fuel tank is disposed in the rear, and each side portion of the lower portion of the fuel tank is extended below each seat rail. It is disclosed that a capacity is secured by adopting a configuration in which it is made to come out.

JP 2002-225769 A

  In the scooter type motorcycle, a bridge (cross member) is installed between rear end portions of the left and right seat rails. In order to avoid interference with the bridge when the storage box is disposed in front between the left and right seat rails and the fuel tank is disposed rearward, a configuration in which the fuel tank is disposed in front of the bridge is conceivable. However, in the configuration in which the fuel tank is arranged in front of the bridge, the front and rear length of the fuel tank is shortened, and the capacity of the fuel tank is reduced. Or if the length of the fuel tank is to be secured, the capacity of the storage box will be reduced.

  Moreover, in patent document 1, it is set as the structure which extends each side part of the lower part of a fuel tank to the downward direction of each seat rail. However, since the space below the seat rail is occupied, the degree of freedom when arranging an air cleaner, a cushion unit, or the like below the seat rail is low.

  The present invention has been made in view of the above points, and is intended to ensure the capacity of the fuel tank by effectively utilizing the space below the bridge constructed between the left and right seat rails. Objective.

The motorcycle according to the present invention includes left and right seat rails extending in the longitudinal direction of the vehicle body, a bridge constructed between the left and right seat rails, a fuel tank disposed between the left and right seat rails, and a rear side of the bridge. And fuel tank mounting brackets provided on the left and right seat rails, the fuel tank extends rearward through the lower part of the bridge, and the rear portion of the fuel tank is fixed to the fuel tank mounting bracket. Characterized by points.
Another feature of the motorcycle according to the present invention is that the bridge includes a leg portion erected on an upper surface of the left and right seat rails, and a laterally extending portion that connects the left and right leg portions. It is in the point which exhibits A bracket extending rearward is provided in the laterally extending portion of the bridge, and in a plan view of the vehicle body, a grab bar or a carrier to the bracket is placed inside a fixed portion of the fuel tank to the fuel tank mounting bracket. You may make it arrange | position a fixed location.
Another feature of the motorcycle according to the present invention is that the upper surface of the fuel tank has a shape in which the rear side surface is lowered by one step compared to the front side surface, and below the bridge, The rear surface of the upper surface of the fuel tank is located.
Another feature of the motorcycle according to the present invention is that the fuel tank bulges up and down the seat rail in a side view of the vehicle body.

  According to the present invention, the capacity of the fuel tank can be ensured by effectively utilizing the space below the bridge that is laid between the left and right seat rails.

1 is a left side view showing a schematic configuration of a scooter type motorcycle according to an embodiment. 1 is a perspective view showing a structure around a fuel tank of a scooter type motorcycle according to an embodiment. 1 is a left side view showing a structure around a fuel tank of a scooter type motorcycle according to an embodiment. It is the figure which looked at the structure around the fuel tank of the scooter type motorcycle concerning an embodiment from the back. 1 is a plan view showing a structure around a fuel tank of a scooter type motorcycle according to an embodiment.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a left side view showing a schematic configuration of a scooter type motorcycle according to the present embodiment. In each figure described below, the front of the vehicle is indicated by an arrow Fr, and the rear is indicated by an arrow Rr. Note that the front, rear, left, and right directions are directions viewed from the driver when boarding.

As shown in FIG. 1, the body frame of the scooter type motorcycle includes a head pipe 1, a down tube 2 that extends downward from the head pipe 1, and extends substantially horizontally from the middle toward the rear, and a down tube 2. A bridge tube 32 extending in the left-right width direction from the rear end portion, and left and right seat rails (also referred to as rear frames) 3R, 3L respectively extending rearward and upward from substantially left and right end portions of the bridge tube 32. Configured as the main element.
The left and right front forks 4 are supported by the head pipe 1 so as to be rotatable left and right. A front wheel 5 is rotatably supported at a lower portion of the front fork 4, and the front wheel 5 is steered left and right by a handle bar 6.

The seat rails 3R and 3L are formed in a pipe shape, and rise from the substantially right and left ends of the bridge tube 32 toward the back surface of the seat 12, respectively. It extends rearward toward the tail lamp 10 substantially parallel to the lower edge.
As shown in FIG. 2, a storage box 7 is disposed between the left and right seat rails 3R, 3L. The storage box 7 is mounted such that its front part protrudes forward from the seat rails 3R, 3L. A fuel tank 8 is disposed behind the storage box 7 between the left and right seat rails 3R, 3L.
A seat 12 is installed above the storage box 7 and the fuel tank 8. The front portion of the seat 12 is supported by a hinge mechanism so as to be pivotable up and down, covers the storage box 7 and the fuel tank 8 from above, and also serves as a lid for closing the opening of the storage box 7 opened upward.

A support frame is provided below the seat rails 3R and 3L, and the engine unit 15 is swingably coupled to the support frame. The engine unit 15 includes a four-cycle single-cylinder engine body 16 disposed along the front-rear direction of the vehicle with the cylinder head facing forward and the cylinder axis nearly horizontal, and extends rearward from the left side of the engine body 16 The transmission case 17 is integrally provided. The transmission case 17 also serves as a swing arm. The rear case 18 is pivotally supported at the rear end thereof, and the transmission case 17 is elastically supported by the seat rail 3L by the rear cushion unit 19. Note that the upper end of the rear cushion unit 19 may be supported by a bridge tube 25 described later. An air cleaner 22 is provided on the transmission case 17 of the engine unit 15 to clean the outside air and supply it to the engine unit 15. The air cleaner 22 is connected to the engine body 16 and is integrated with the engine unit 15.
Further, on the side opposite to the transmission case 17, that is, on the right side of the vehicle body, an exhaust pipe is connected to the exhaust port of the engine body 16 of the engine unit 15, and a muffler extending rearward and obliquely upward at the rear end of the exhaust pipe. 21 connects.

  In the scooter type motorcycle, a step floor 26 on which the front of the seat 12 enters the lower side and the occupant puts his / her foot on the bottom is configured. The vehicle body frame is covered with a vehicle body cover, and the vehicle body cover constitutes the appearance of the vehicle body. The body cover covers the seat rail cover front 27 disposed between the rear end of the step floor 26 and the front edge of the seat 12, and the seats that cover the left and right seat rails 3 </ b> R and 3 </ b> L, the storage box 7, and the side of the fuel tank 8. A plurality of cover elements such as the rail cover 28 are combined. A tail lamp 10 is disposed at the rear end of the seat rail cover 28. Further, the rear fender 29 is disposed so as to be connected to the seat rail cover 28 from below the fuel tank 8, and extends from the rear end lower part of the tail lamp 10 to the rear lower part.

  Hereinafter, the structure around the fuel tank 8 will be described with reference to FIGS. FIG. 2 is a perspective view showing a structure around the fuel tank 8. FIG. 3 is a left side view showing the structure around the fuel tank 8. FIG. 4 is a view of the structure around the fuel tank 8 as seen from the rear. FIG. 5 is a plan view showing the structure around the fuel tank 8 and shows a state where a grab bar (tandem grip) 13 is mounted.

  A bridge 9 is installed between rear end portions of the left and right seat rails 3R and 3L. The bridge 9 is made of a pipe material, and has a gate shape including leg portions 9b and 9b erected on the upper surfaces of the left and right seat rails 3R and 3L, and a laterally extending portion 9a that connects the left and right leg portions 9b and 9b. Presents. The joint between the seat rails 3R and 3L and the leg portion 9b of the bridge 9 is reinforced by the reinforcing plate 31. The reinforcing plates 31 are respectively joined to the upper surfaces of the seat rails 3R and 3L and the front surfaces of the leg portions 9b of the bridge 9, and are reinforced by suppressing the collapse of the leg portions 9b. Further, the bridge 9 is installed between the rear end portions of the left and right seat rails 3R and 3L in this way, which greatly contributes to the improvement of the rigidity of the frame.

  A seat lock mechanism 11 that engages and holds the rear portion of the seat 12 is provided on the front side of the central portion of the laterally extending portion 9a. The seat lock mechanism 11 is disposed above a rear side surface 8d that is one step lower than a front side surface 8c in an upper surface 8b of a fuel tank 8 to be described later.

Moreover, as shown in FIG. 5, the bracket 14 is provided in the center part of the left-right direction extension part 9a so that it may extend back. The bracket 14 is formed shorter in the left-right direction than the left-right extending portion 9a, and mounting holes 14a are formed in the left and right ends of the bracket 14, and the grab bar 13 is screwed and fixed using these mounting holes 14a. It is possible. The front part of the grab bar 13 is respectively arranged on the outside thereof along the rear part of the seat rails 3R, 3L, the rear part of the grab bar 13 extends rearward from the seat rails 3R, 3L and is curved, and the left and right are continuous. And has a U-shaped basic shape opening forward as a whole. The grab bar 13 has an attachment arm portion extending inward from the U-shaped basic shape, the tip end portion of this attachment arm portion is overlapped with the left and right end portions of the bracket 14, and the grab bar 13 is screwed and fixed to the bracket 14. Although the grab bar 13 has been described here, it is also possible to fix a carrier (loading platform) that is disposed along the both sides of the rear portion of the seat rails 3R and 3L and extends rearward in the same manner.
In the bracket 14, a region 14b between the mounting holes 14a is used as a frame number stamping space. Further, a mounting hole for fastening and fixing the tail lamp 10 with a screw, for example, may be formed in the bracket 14.

  At the rear ends of the left and right seat rails 3 </ b> R and 3 </ b> L, fuel tank mounting brackets 20 and 20 are projected inwardly behind the bridge 9. The fuel tank mounting brackets 20 and 20 have a substantially horizontal fuel tank mounting surface, and receive a load in a planar shape on this mounting surface.

As shown in FIG. 2, the fuel tank 8 has a shape in which the front is wide and the rear is slightly narrow so as to match the width between the seat rails 3R and 3L. That is, the seat rails 3R and 3L pass through the left and right sides of the fuel tank 8 and extend back and forth. The fuel tank 8 is formed by joining an upper member and a lower member, and around the fuel tank 8 is formed a flange 8a that is a joint portion between the upper member and the lower member and also functions as an attachment portion. Further, as shown in FIG. 3, the fuel tank 8 bulges up and down the seat rails 3R and 3L in a side view of the vehicle body, and has a relief shape 8e of the rear cushion unit 19 at the lower front side portion. The relief shape 8 e is formed by denting the front left lower corner of the fuel tank 8.
The upper surface 8b of the fuel tank 8 has a shape in which the rear side surface 8d is lowered by one step compared to the front side surface 8c. A fuel filler port 23 is provided on the upper surface 8 b of the fuel tank 8 in front of the bridge 9. That is, the fuel filler port 23 is disposed on the front side surface 8c formed one step higher. Further, the fuel filler 23 is disposed at a position biased to one side of the front surface 8c in the left-right direction of the vehicle, and a fuel pump is disposed on the other side of the front surface 8c.

Here, the mounting structure of the fuel tank 8 will be described.
A bridge tube 25 is installed between intermediate positions of the seat rails 3R and 3L in front of the bridge 9, and the front portion of the fuel tank 8 is supported in such a manner that the flange 8a is placed on the bridge tube 25. . That is, the bridge tube 25 is disposed between the storage box 7 and the fuel tank 8 so as to cross the front side of the fuel tank 8.
On the other hand, the fuel tank 8 passes below the bridge 9 and extends rearward from the bridge 9 (in this embodiment, extends rearward from the rear end of the bracket 14 to ensure the capacity of the fuel tank 8. ) The rear portion of the fuel tank 8 is supported in such a manner that the flange 8a is placed on the fuel tank mounting brackets 20 and 20. Below the bridge 9, a rear surface 8 d (a surface having a shape lowered one step) of the upper surface 8 b of the fuel tank 8 is located. In other words, the bridge 9 has a leg portion 9b, 9b that is disposed on the side of the rear portion of the fuel tank 8 and extends higher than the upper surface of the fuel tank 8, and connects the left and right leg portions 9b, 9b. The extending portion 9 a crosses over the rear surface 8 d of the upper surface 8 b of the fuel tank 8.

  The mounting structure of the rear part of the fuel tank 8 will be described in more detail. A tank fixing nut (not shown) is fixed to the fuel tank mounting bracket 20 on the back side of the mounting surface. Further, as shown in FIG. 2, holes corresponding to the nuts of the fuel tank mounting bracket 20 are formed in the left and right corners of the flange 8 a at the rear portion of the fuel tank 8. The rear part of the fuel tank 8 can be fixed by fastening the screw 30 to the hole from above with the flange 8a placed on the mounting bracket 20. The fuel tank mounting bracket 20 has a structure in which the center is not connected in a configuration in which a pair of left and right are arranged, so that interference with the fuel tank 8 can be avoided, and the mounting locations on the fuel tank 8 side are the left and right corner portions of the flange 8a. Thus, the rear portion of the fuel tank 8 can be disposed behind the front end edge of the fuel tank mounting bracket 20, and the capacity of the fuel tank can be further ensured.

  Further, as shown in FIG. 2, the grab bar 13 (or carrier) is fixed to the bracket 14 on the inner side of the fuel tank 8 fixing point (see the screw 30) to the fuel tank mounting bracket 20 in a plan view of the vehicle body. (See the mounting hole 14a). That is, the fuel tank 8 is fixed at the rear side of the bridge 9 and outside the bracket 14 in the vehicle left-right direction. Thereby, the assembly of the fuel tank 8 and the assembly of the grab bar 13 can be avoided and the assembly work can be facilitated. As shown in FIG. 5, when the grab bar 13 is assembled, the mounting arm portion of the grab bar 13 is disposed above the fixed portion of the fuel tank 8, and the fixed portion of the fuel tank 8 to the fuel tank mounting bracket 20 is fixed by the grab bar 13. Will be obscured. The mounting arm portion of the grab bar 13 also functions as a contact surface with which a cushion of a load receiver attached to the lower surface of the seat 12 contacts, and contributes to downsizing of the bracket 14 while ensuring a wide cushion interval.

As described above, since the fuel tank 8 extends rearward through the lower part of the bridge 9, the space under the bridge 9 can be effectively used to secure the capacity of the fuel tank 8. it can. Alternatively, the capacity of the storage box 7 in front of the fuel tank 8 can be secured by positioning the fuel tank 8 rearward.
Since the capacity of the fuel tank 8 can be ensured in this way, it is not necessary to extend each side part of the lower part of the fuel tank to below the seat rails as in Patent Document 1. Therefore, it is possible to secure a degree of freedom when arranging an air cleaner, a cushion unit, or the like below the seat rail.

  Further, since the fuel tank 8 is supported not by the bridge 9 but by the fuel tank mounting brackets 20 and 20 which are separate from the bridge 9, the seat load and impact acting on the bridge 9 are transmitted to the fuel tank 8. Can not be. Further, since it is not necessary to support the fuel tank 8 with the bridge 9, the degree of freedom in designing the bridge 9 is increased. For example, the support portion of the rear portion of the seat 12 can be arranged as far back as possible to expand the seat seat surface. . Further, as shown in FIG. 5, when the grab bar 13 or the carrier is fixed to the bridge 9, the support portion of the grab bar 13 or the carrier is arranged at the rear, and the distance from the power point is reduced to act on the grab bar 13 or the carrier. The bending moment to be reduced can be reduced.

  Further, since the flange 8a of the fuel tank 8 is supported by being placed on the fuel tank mounting bracket 20, the weight of the fuel tank 8 can be received in a planar shape. This reduces the burden on the fuel tank 8 compared to, for example, supporting the fuel tank 8 in a suspended form, which is advantageous in terms of strength.

As mentioned above, although this invention was demonstrated with various embodiment, this invention is not limited only to these embodiment, A change etc. are possible within the scope of the present invention.
In the above embodiment, the example in which the bridge 9 is made of a pipe material has been described. However, the present invention is not limited thereto, and for example, the bridge 9 may be made of a plate material.

  1: head pipe, 2: down tube, 3R, 3L: seat rail, 8: fuel tank, 8a: flange, 8b: top surface, 9: bridge, 9a: left and right direction extending portion, 9b: leg portion, 12: seat, 13: Grab bar, 14: Bracket, 15: Engine unit, 20: Fuel tank mounting bracket

Claims (5)

Left and right seat rails extending in the longitudinal direction of the vehicle body,
A bridge constructed between the left and right seat rails;
A fuel tank disposed between the left and right seat rails;
A fuel tank mounting bracket provided on the left and right seat rails behind the bridge,
2. The motorcycle according to claim 1, wherein the fuel tank extends rearward under the bridge, and a rear portion of the fuel tank is fixed to the fuel tank mounting bracket.   The said bridge | bridging exhibits the portal type | mold consisting of the leg part standingly arranged by the upper surface of the said left and right seat rail, and the left-right direction extension part which connects between the said left and right leg parts. Motorcycle. A bracket extending rearward is provided in the laterally extending portion of the bridge,
The motorcycle according to claim 2, wherein a grab bar or carrier fixing part to the bracket is arranged inside a fixing part of the fuel tank to the fuel tank mounting bracket in a plan view of the vehicle body. The upper surface of the fuel tank has a shape in which the rear side surface is lowered by one step compared to the front side surface,
The motorcycle according to any one of claims 1 to 3, wherein a rear side surface of the upper surface of the fuel tank is located below the bridge.   The motorcycle according to any one of claims 1 to 4, wherein the fuel tank bulges up and down the seat rail in a side view of the vehicle body.

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