JP5869218B2 - Motorcycle fuel tank mounting structure - Google Patents

Description

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

  In a motorcycle, as shown in Patent Document 1, the fuel tank is supported by the body frame. When the fuel tank is attached to the pair of left and right body frames, the pair of left and right body frames are connected to each other. A cross member is provided, and a fuel tank is placed on the cross member.

JP 2006-21638 A

  Accordingly, an object of the present invention is to provide a fuel tank mounting structure that eliminates the need for a cross member for supporting the fuel tank and that can simplify the portion that supports the fuel tank while maintaining the rigidity of the vehicle body frame. To do.

  The present invention is characterized in that, in the fuel tank mounting structure for a motorcycle, a mounting body for detachably mounting the fuel tank to the vehicle body frame connects a pair of left and right rear frames.

  According to the above configuration, the attachment body for attaching the fuel tank to the vehicle body frame connects the pair of left and right rear frames, so that the cross member can be eliminated while maintaining the rigidity of the vehicle body frame. The configuration can be simplified.

The present invention preferably further comprises the following configuration.
(1) The mounting body supports the fuel tank so as to be angularly displaceable about an axis extending in the vehicle width direction.
(2) The pair of left and right rear frames has a protruding portion that protrudes inward in the vehicle width direction at a connecting portion with the mounting body, and the motorcycle seat is mounted on the protruding portion from above. A placement portion to be placed is formed.
(3) In the configuration (2), an engagement portion that protrudes forward and downward is provided on the lower surface of the front portion of the seat, and the engagement portion engages with the protrusion from below.
(4) In the configuration (2) or (3), a step for passengers is provided on an outer side surface in the vehicle width direction of the pair of left and right rear frames, and the connecting portion includes a step for the passengers It is provided in the vicinity.
(5) In any one of the configurations (2) to (4), the protruding portion protrudes further upward, and the attachment body is attached to the rear upper wall of the fuel tank. A bracket is provided, and in a state where the fuel tank is attached to the vehicle body frame by the attachment body, a rear end portion of the fuel tank is positioned below the rear portion of the attachment body.

  According to the configuration (1), since the attachment body supports the fuel tank so as to be angularly displaceable, the fuel tank is removed from the vehicle body frame when inspecting and maintaining parts located below the fuel tank, such as an air cleaner or a throttle body. The inspection and maintenance of the member can be performed only by angularly displacing the fuel tank with respect to the mounting body.

  According to the configuration (2), since the seat placing portion is placed on the protruding portion of the rear frame, it is not necessary to separately provide a portion for supporting the seat. Further, since the seat load is received by the rear frame, it is possible to prevent the seat load from being applied to the fuel tank.

  According to the configuration (3), since the protruding portion of the rear frame and the engaging portion of the seat are engaged, the seat can be held on the rear frame.

  According to the configuration (4), since the connecting portion of the rear frame is provided in the vicinity of the passenger's step, the passenger's load can be borne by the connecting portion of the rear frame and the mounting body. The rigidity of the rear frame against the load of the person can be improved.

  According to the configuration (5), since the rear end portion of the fuel tank is positioned below the rear portion of the attachment body, the vertical position of the fuel tank can be lowered. As a result, the center of gravity and the seat height of the vehicle body can be lowered.

  In short, according to the present invention, it is possible to provide a fuel tank mounting structure that does not require a cross member for supporting the fuel tank, and that can simplify the portion that supports the fuel tank while maintaining the rigidity of the vehicle body frame.

1 is a left side view of a motorcycle according to an embodiment of the present invention. Fig. 2 is a perspective view of a rear portion of a fuel tank of the motorcycle shown in Fig. 1. FIG. 3 is a perspective view of a rear portion of the fuel tank of the motorcycle of FIG. 1 from a direction different from that of FIG. 2. It is IV-IV sectional drawing of FIG. It is a side view of the rear part of a fuel tank in the state where the seat for drivers was attached. FIG. 6 is a rear perspective view of FIG. 5.

  FIG. 1 is a left side view of a motorcycle 1 according to an embodiment of the present invention. Note that the concept of direction used in the present embodiment will be described as being consistent with the concept of direction viewed from the driver of the motorcycle 1.

  As shown in FIG. 1, the motorcycle 1 includes a front wheel 2 and a rear wheel 3, and the front wheel 2 is rotatably supported by a lower portion of a front fork 4 extending substantially in the vertical direction. The front fork 4 is supported by the steering shaft 5. The steering shaft 5 is rotatably supported by the head pipe 6. A bar-type steering handle 7 extending left and right is attached to an upper bracket (not shown) provided at the upper end of the front fork 4. Accordingly, when the driver swings the steering handle 7 to the left and right, the front wheels 2 are steered with the steering shaft 5 as the rotation axis.

  The body frame has a main frame 8 and a rear frame 18, and the main frame 8 is a pair of left and right, and extends rearward from the head pipe 6. A front end portion of the swing arm 9 is pivotally supported by a pivot bolt 10 at the rear lower end portion of the main frame 8, and the rear wheel 3 is rotatably supported at the rear end portion of the swing arm 9. A fuel tank 11 is disposed above the main frame 8 and behind the steering handle 7, and a driver seat 12 is disposed behind the fuel tank 11. A passenger's seat 13 is disposed behind the driver's seat 12. An engine 20 is mounted below the fuel tank 11. An output sprocket (not shown) is disposed at the rear of the engine 20, and the power of the output sprocket is transmitted to the rear wheel 3 through the chain 14.

  A headlamp 16 is disposed in front of the steering handle 7, and the headlamp 16 is covered with a front cowl 17. The front cowl 17 is a full cowl type in which the upper part covers the headlamp 16 and the lower part covers the engine 20 and the like.

  2 is a perspective view of the rear portion of the fuel tank 11 of the motorcycle 1 of FIG. 1, and FIG. 3 is a perspective view of the rear portion of the fuel tank 11 of the motorcycle 1 of FIG. FIG. 2 and 3 exclude the driver's seat 12 and the passenger's seat 13. As shown in FIGS. 2 and 3, the front upper ends of the pair of left and right rear frames 18 are connected to the rear upper ends of the pair of left and right main frames 8, respectively. The rear ends of the pair of left and right rear frames 18 are connected by a connecting member 19.

  The rear frame 18 is formed in a shape that extends upward along the plane perpendicular to the vehicle width direction from the front end to the rear. A driver's seat 12 is arranged at the upper part of the rear frame 18, and a passenger's step 131 that is a footrest for the passenger sitting on the passenger's seat 13 is provided at the lower part of each rear frame 18. A supporting step stay 132 is connected. The rear portion of the fuel tank 11 is disposed between the front portions of the pair of left and right rear frames 18.

  A projecting portion 31 that projects inward in the vehicle width direction from the upper wall 18b of the rear frame 18 is formed at a middle portion in the front-rear direction of each rear frame 18, more specifically at a substantially central portion in the front-rear direction. The protruding portion 31 has an upper protruding portion 31a that protrudes further upward at the inner end in the vehicle width direction, and a mounting bolt 41 and a nut 42, which are mounting bodies, connect the pair of left and right upper protruding portions 31a. Yes. Specifically, a through-hole penetrating in the vehicle width direction is formed in the upper projecting portion 31a, the mounting bolt 41 penetrates the through-hole, and the bolt head 41a is an upper portion of one rear frame. The protrusion 31a is disposed on the outer surface in the vehicle width direction, and the bolt front end portion 41b is disposed on the outer side in the vehicle width direction of the upper protrusion 31a of the other rear frame. The mounting bolt 41 is formed with an external screw at least from the bolt front end portion 41b to the upper protruding portion 31a. The bolt head portion 41a of the mounting bolt 41 and the nut 42 screwed to the mounting bolt 41 A pair of rear frames 18 are sandwiched.

  A mounting bracket 433 for mounting the mounting bolt 41 is fixed to the upper rear wall of the fuel tank 11. 4 is a cross-sectional view taken along the line IV-IV in FIG. As shown in FIG. 4, on the inner periphery of the mounting bracket 433, a cylindrical collar member 431 and a cylindrical damper member 432 made of an elastic body such as rubber are provided in order from the mounting bolt 41 side to the outer side. It has been. The collar member 431 is made of a material having relatively high rigidity, for example, metal, and is disposed between the upper projecting portions 31 a of the rear frames 18. The collar member 431 is penetrated by the mounting bolt 41, and both end portions of the collar member 431 are in contact with the inner side surface in the vehicle width direction of the upper protruding portion 31a. Thus, the distance between the rear frames 18 in the vehicle width direction is defined by the collar member 431, and the rear frames 18 are rigidly connected to each other. That is, the mounting bolt 41 and the nut 42 are configured to fasten the upper projecting portion 31 a of the projecting portion 31 and the collar member 431. Then, the mounting bracket 433 or the mounting bracket 433 and the damper member 432 can be rotated with the mounting bolt 41 as an axis. As a result, the fuel tank 11 has a vertical angle with the mounting bolt 41 as an axis. Displaceable. Therefore, the fuel tank 11 has a rotation axis set at one end (rear part), and in the storage state of the fuel tank 11, one end (rear part) is located rearward and the other end (front part) is forward. The other end portion (front portion) and one end portion (rear portion) are arranged in the front-rear direction. And in the rotation state of the fuel tank 11, compared with the storage state, the other end portion (front portion) is positioned higher than the one end portion (rear portion). Further, the damper member 432 is provided between the mounting bracket 433 and the collar member 431, so that the fuel tank 11 has a buffering property with respect to the mounting bolt 41.

  The mounting bracket 433 is connected to the plate-like base portion 433a extending along the upper surface of the fuel tank 11 and fixed to the tank, the standing portion 433b standing upward from the base portion 433a, and the standing portion 433b. And a cylindrical portion 433c having a cylindrical shape. The upright portions 433b are arranged at intervals in the vehicle width direction, and a side end portion 433b1 extending along a plane perpendicular to the vehicle width direction and a central portion 433b2 extending in the vehicle width direction and connecting the side end portion 433b1. And having. The cylindrical portion 433c is fixed to the standing portion 433b so that the central axis extends in the vehicle width direction and coincides with a predetermined rotation axis of the fuel tank 11. The cylindrical portion 433c is formed between the side end portions 433b1 of the standing portion 433b, and both end portions of the cylindrical portion 433c protrude in the vehicle width direction from the standing portion 433b. The internal space of the cylindrical portion 433c is opened at both ends of the cylindrical portion 433c. As described above, in the inner space of the cylindrical portion 433c, the cylindrical damper member 432, the cylindrical collar member 431, and the mounting bolt 41 are arranged coaxially in this order toward the center in the radial direction.

  FIG. 5 is a side view of the rear portion of the fuel tank 11 with the driver's seat 12 attached, and FIG. 6 is a rear perspective view of FIG. As shown in FIGS. 5 and 6, an engagement portion 12 a that protrudes downward and forward is provided on the lower surface of the front portion of the driver seat 12. Then, the distal end of the engaging portion 12a is inserted between the protruding portion 31 and the fuel tank 11, and the upper surface of the leading end of the engaging portion 12a and the lower surface of the protruding portion 31 come into contact with each other, thereby engaging with the protruding portion 31. The joint portion 12a is engaged.

  Further, on the front lower surface of the driver's seat 12, a mounting portion 12b protruding downward is provided in front of the engaging portion 12a. The driver's seat 12 is supported by the protruding portion 31 by mounting the mounting portion 12b on the protruding portion 31 from above. Further, a damper member 12c made of an elastic body such as rubber is attached to the lower end portion of the mounting portion 12b, and the mounting portion 12b has a buffering property with respect to the protruding portion 31.

  As shown in FIG. 1, step stays 132 that support the passenger step 131 are respectively attached to the pair of left and right rear frames 18. 2, 3, 5, and 6, the rear frame 18 is formed with a boss portion 18 a for attaching the step stay 132. The step stay 132 is attached to the boss portion 18 a by a bolt. At 133, it can be attached.

  The projecting portion 31 fastened to the mounting bolt 41 and the nut 42 for connecting the left and right rear frames 18 is provided in the vicinity of the boss portion 18a.

  According to the mounting structure of the fuel tank 11 having the above configuration, the following effects can be exhibited.

(1) Since the mounting bolt 41 and the nut 42 for attaching the fuel tank 11 to the rear frame 18 connect the pair of left and right rear frames 18, the rigidity of the rear frame 18 can be maintained. Therefore, it is not necessary to integrally form a cross member for connecting the rear frame 18 with the rear frame 18, and the configuration of the rear frame 18 can be simplified, for example, the rear frame 18 can be reduced in size.

(2) Since the mounting bolt 41 and the nut 42 support the fuel tank 11 so as to be angularly displaceable, when performing inspection and maintenance of parts located below the fuel tank 11, such as an air cleaner or a throttle body, the fuel tank 11 is attached to the rear frame. The member can be inspected and maintained by merely angularly displacing the fuel tank 11 with respect to the mounting bolt 41 and the nut 42 without removing the fuel tank 11.

(3) Since the placement portion 12b of the driver's seat 12 is placed on the protruding portion 31 of the rear frame 18, there is no need to separately provide a portion for supporting the driver's seat 12. . Further, since the load of the driver's seat 12 is received by the rear frame 18, it is possible to prevent the load of the driver's seat 12 from being applied to the fuel tank 11.

(4) Since the protrusion 31 of the rear frame 18 and the engaging portion 12a of the driver's seat 12 are engaged, the driver's seat 12 can be held on the rear frame 18. .

(5) Since the mounting bolt 41 for connecting the rear frame 18 and the protruding portion 31 to which the nut 42 is attached are provided in the vicinity of the boss portion 18a to which the step stay 132 for supporting the passenger step 131 is attached. The load of the passenger can be borne by the connecting portion of the rear frame 18 and the mounting bolt 41, and the rigidity of the rear frame 18 with respect to the passenger's load can be improved.

(6) Since the rear end portion of the fuel tank 11 is positioned below the rear portion of the mounting bolt 41, the vertical position of the fuel tank 11 can be lowered. As a result, the center of gravity of the vehicle body of the motorcycle 1 and the height of the driver's seat 12 can be reduced.

(7) Since the damper member 432 is provided between the mounting bracket 433 and the collar member 431, the fuel tank 11 has a buffering property with respect to the mounting bolt 41. As a result, vibration between the fuel tank 11 and the rear frame can be mitigated when the motorcycle 1 is operated or when the fuel tank 11 is angularly displaced.

(8) Since the damper member 12c is attached to the lower end portion of the mounting portion 12b, the mounting portion 12b has a buffering property with respect to the protruding portion 31. As a result, vibration between the driver's seat 12 and the rear frame 18 during driving can be mitigated.

(9) Since the rotation axis of the fuel tank 11 is set above the rear frame 18, the fuel tank can be attached and detached easily. Further, since the rotation axis of the fuel tank 11 is set above the rear frame 18, the upper surface of the fuel tank 11 can be disposed as high as possible with respect to the rear frame 18. The fuel tank part located can be increased.

(10) Since the left and right rear frames 18 are formed in a plate shape, when the rear frame 18 is formed by a molding die, it is possible to prevent the molding die from becoming large. Further, even when the rear frame 18 is formed by cutting, the portion cut from the plate state can be reduced, and the yield can be improved.

(11) Since the upward projecting portion 31a is disposed on the inner side in the vehicle width direction with respect to the upper wall 18b of the rear frame 18, the mounting bolt 41 and the nut 42 of the mounting body protrude on the outer side in the vehicle width direction with respect to the rear frame 18. Can be prevented.

(12) Since the protruding portion 31 is located between the fuel tank 11 and the driver's seat 12, the support of the fuel tank 11 and the holding of the driver's seat 12 are performed by the same member (the protruding portion 31). This can be realized and the number of parts can be reduced. In addition, since the driver's seat 12 is placed on the upper surface of the protruding portion 31, the driver's seat 12 can be easily attached and detached. Further, the mounting bolt 41 can be disposed in the space between the fuel tank 11 and the driver's seat 12 by disposing the mounting bolt 41 on the inner side in the vehicle width direction of the two mounting portions 12b. There is no need to separately form a storage space for the bolt 41.

(13) Since the mounting bolt 41 is configured to be detachable from the rear frame 18, it interferes with the mounting bolt 41 by removing the mounting bolt 41 before the fuel tank 11 or attaching it after the fuel tank 11. The fuel tank 11 can be detached from the rear frame 18 without any trouble.

(14) Since the mounting bolt 41 is disposed between the portion connected to the main frame 8 of the rear frame 18 and the portion connected by the connecting member 19, at least at three positions spaced in the front-rear direction. The left and right rear frames 18 can be connected, and the rigidity of the rear frame 18 can be improved.

(15) Since the placement portion 12b is formed, the driver's seat 12 and the mounting bracket 433 can be prevented from contacting each other.

[Other Embodiments]
In the present embodiment, the mounting body is the mounting bolt 41 and the nut 42, but the mounting body is not limited to the mounting bolt 41 and the nut 42, and any shaft body that supports the fuel tank 11 so as to be angularly displaceable may be used. However, the shaft body needs to have a fastening function capable of connecting the left and right rear frames.

  In the present embodiment, the protruding portion 31 protrudes inward in the vehicle width direction and further protrudes upward at the inner end in the vehicle width direction. However, the protruding portion 31 protrudes outward in the vehicle width direction, and further You may protrude upwards in the width direction outer end. In this case, the length in the vehicle width direction of the mounting bolt 41 is longer than the length in the vehicle width direction between the rear frames 18. The protruding portion 31 may protrude upward from the upper wall 18b of the rear frame 18, and may further protrude inward in the vehicle width direction or outward in the vehicle width direction at the upper end.

  In the present embodiment, the rotation axis of the fuel tank 11 is set above the upper wall 18b of the rear frame 18, but may be set below the upper wall 18b of the rear frame 18. Further, although the collar member 431 is in contact with the upper protruding portion 31a, a gap may be formed between the collar member 431 and the upper protruding portion 31a. In this embodiment, the nut 42 is disposed on the outer surface in the vehicle width direction of the upper protrusion 31a of the other rear frame, but a gap is formed between the collar member 431 and the upper protrusion 31a. In this case, in addition to the nut 42, a nut may be further disposed on the inner side surface in the vehicle width direction of the upper projecting portion 31 a of the rear frame 18, and the collar member 431 may be positioned in the vehicle width direction.

  In the present embodiment, the mounting bolt 41 supports the fuel tank 11, but instead of the fuel tank 11, a tank body that contains other fuel may be supported. Further, the mounting bolt 41 may support a lid that covers the upper portion of the main frame 8.

  Various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the appended claims.

  The fuel tank mounting structure according to the present invention eliminates the need for a cross member for supporting the fuel tank and simplifies the portion supporting the fuel tank while maintaining the rigidity of the vehicle body frame. It is.

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Front wheel 3 Rear wheel 4 Front fork 5 Steering shaft 6 Head pipe 7 Steering handle 8 Main frame 9 Swing arm 10 Pivot bolt 11 Fuel tank 12 Driver's seat 12a Engagement part 12b Mount part 12c Damper member 13 Passenger seat 131 Passenger step 132 Step stay 133 Bolt 14 Chain 16 Headlamp 17 Front cowl 18 Rear frame 18a Boss portion 18b Upper wall 19 Connecting member 20 Engine 31 Protruding portion 31a Upper projecting portion 41 Mounting bolt 41a Bolt head Part 41b Bolt tip part 42 Nut 431 Collar member 432 Damper member 433 Mounting bracket 433a Base part 433b Standing part 433b1 Side end part 433b2 Center part 433c The cylindrical portion

Claims (6)

A mounting body for detachably attaching a fuel tank of a motorcycle to a vehicle body frame includes a shaft body that supports the fuel tank so as to be angularly displaceable about an axis extending in a vehicle width direction.
The shaft body includes a collar member extending along the axis, and a bolt member disposed on the coaxial line of the axis,
When the collar member is disposed between the pair of left and right rear frames, the bolt member presses one rear frame against one end of the collar member and presses the other rear frame against the other end of the collar member. The fuel tank mounting structure is characterized in that the shaft body connects the pair of left and right rear frames by pressing the pair of rear frames in a direction approaching each other . The shaft body is disposed between the pair of left and right rear frames in the vehicle width direction, and defines the width direction of the pair of left and right rear frames.
The fuel tank mounting structure according to claim 1 , wherein the shaft body includes a damper member made of an elastic body on an outer peripheral portion of the collar member . The shaft body includes a cylindrical collar member and a bolt member penetrating the collar member,
The bolt member is constituted by one bolt that penetrates the pair of left and right rear frames,
The fuel tank mounting structure according to claim 1 or 2, wherein the pair of left and right rear frames are fastened by the bolt members. The pair of left and right rear frames has a protruding portion that protrudes inward in the vehicle width direction at a connecting portion with the attachment body,
The shaft body is adapted to connect the pair of left and right protrusions,
The protrusion includes a seat fixing portion for fixing the seat, and a connecting portion connected to the shaft body,
The fuel tank mounting structure according to any one of claims 1 to 3, wherein the seat fixing portion is disposed on the outer side in the vehicle width direction than the connecting portion . Passenger steps are provided on the vehicle lateral direction outer side surfaces of the pair of left and right rear frames,
The fuel tank mounting structure according to claim 4, wherein the connecting portion is provided in the vicinity of the passenger step. The protruding portion protrudes further upward,
A mounting bracket for the mounting body is provided on the rear upper wall of the fuel tank,
6. The fuel tank according to claim 4, wherein a rear end portion of the fuel tank is positioned below a rear portion of the attachment body in a state where the fuel tank is attached to the vehicle body frame by the attachment body. Fuel tank mounting structure.

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