JP2010000813A - Motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motorcycle capable of adjusting the height of only a hip point without changing the height position of a rear end of a seat. <P>SOLUTION: A fixing part 40 fixed to a vehicle body frame 2 so as to be able to adjust the longitudinal position is formed on a rear portion 8b of a seat 8, and height variable mechanisms 41 capable of setting the height of front portions 8a, 8c when the seat 8 is located on the front side higher than that when the seat 8 is located on the rear side are provided in the front portions (a front end and a center portion) 8a, 8c from the fixed part 40 of the seat 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motorcycle including a fuel tank mounted on a vehicle body frame, and a seat disposed so that a lower surface of the front portion is along an upper surface of a rear portion of the fuel tank.

A motorcycle may be provided with a seat height adjustment structure that allows the seat height to be adjusted so that a riding posture corresponding to the rider's physique can be obtained. For example, in Patent Document 1, a stepped portion is provided at the front and rear portions of the bottom plate of the seat, and the height of the seat is adjusted by changing the meshing position of the stepped portion with the vehicle body frame stepwise. A proposed structure has been proposed. In the seat height adjustment structure, the entire sheet is translated in the vertical direction to adjust the height.
JP 2007-118890 A

  By the way, in a motorcycle (motocrosser) for motocross competition, when jumping or getting over obstacles, the rider may improve running performance by moving his / her waist to the rear end of the seat as much as possible. In order to perform such an operation smoothly, it is desirable that the height of the rear end portion be as low as possible regardless of the height of the hip point of the seat.

  In the case of the conventional seat height adjusting structure, as described above, the height of the seat is adjusted by moving the entire seat in the vertical direction. Therefore, when the hip point of the seat is increased, the rear end portion is also increased. . Accordingly, it is impossible to meet the above-described requirement for increasing the hip point and keeping the rear end portion at a low position.

  The present invention has been made in view of the above-described conventional situation, and provides a motorcycle including a seat height adjustment mechanism that can adjust the height of a hip point without changing the height of the rear end portion of the seat. Is an issue.

  The present invention includes an automatic body comprising a vehicle body frame, a fuel tank mounted on the vehicle body frame, and a seat attached to the vehicle body frame, the fuel tank mounted on the rear surface of the fuel tank and the front lower surface thereof being disposed along the rear upper surface. In a two-wheeled vehicle, a rear portion of the seat is fixed to a vehicle body frame so as to fix the position in the front-rear direction, and a front portion of the seat is fixed to the first fixing position. A height varying mechanism that increases the height of the front portion of the seat when the rear portion of the seat is fixed to the second fixing portion located on the rear side of the first fixing portion. It is characterized by that.

  According to the motorcycle of the present invention, the position in the front-rear direction can be adjusted for the rear portion of the seat, the position in the vertical direction can be adjusted for the front portion of the seat, and the rear portion of the seat is fixed at the first fixed position. Since the height of the front side portion is higher than that when it is fixed at the second fixing position on the rear side of the first fixing portion, the front side is changed by fixing the rear portion of the seat in the front-rear direction. Only the part can be changed in height. As a result, it is possible to change only the height of the hip point without changing the height of the rear portion of the seat. For example, it is possible to meet the rider's request when the seat height adjusting mechanism is provided in the motocrosser.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 9 are views for explaining a motorcycle according to an embodiment of the present invention. In the description of the present embodiment, the terms front and rear and left and right mean front and rear and left and right when viewed in a seated state unless otherwise specified.

  In the figure, reference numeral 1 denotes an off-road type motorcycle used for motocross racing or the like.

  The motorcycle 1 includes a cradle-type body frame 2, a water-cooled four-cycle single-cylinder type engine 3 mounted on the body frame 2 with a cylinder axis oriented substantially vertically, and the engine 3 of the body frame 2. A fuel tank 4 mounted on the upper side, and a straddle-type seat 8 disposed on the rear side of the fuel tank 4 and detachably attached to the vehicle body frame 2 are provided.

  The motorcycle 1 includes an intake device 6 and an exhaust device 7 connected to the engine 3, and a radiator 5 is disposed in front of the engine 3.

  The vehicle body frame 2 has a head pipe 9 positioned in front of the fuel tank 4. The head pipe 9 supports the front fork 10 so that it can be steered left and right. A front wheel 11 is pivotally supported at the lower end of the front fork 10, and a steering handle 12 is attached to the upper end. A front fender 13 that covers the front wheel 11 is attached to the front fork 10.

  The motorcycle 1 includes a rear arm 14 supported by a body frame 2 so as to be swingable up and down, a rear wheel 15 pivotally supported on a rear end portion of the rear arm 14, and the body frame 2. 15 and a rear fender 17 that covers the upper part of 15. A rear cushion 16 is interposed between the rear arm 14 and the vehicle body frame 2.

  The vehicle body frame 2 includes the head pipe 9, left and right main frames 20 and 20 extending rearward from the head pipe 9, and one upper down tube 21 extending substantially linearly downward from the head pipe 9. And left and right lower down tubes 22, 22 that branch from the lower end of the upper down tube 21 to the left and right outside and extend substantially horizontally rearward.

  The left and right main frames 20 extend obliquely downward and rearward from the head pipe 9 while expanding outward in the vehicle width direction. The rear ends of the left and right lower down tubes 22 are coupled to the lower ends of the left and right main frames 20.

  The vehicle body frame 2 includes left and right seat rails 23 and 23 extending obliquely upward and rearward from rear lower portions of the left and right main frames 20, and the left and right seat rails 23 and the left and right main frames 20. And left and right seat stays 24, 24 connected to each other.

  Outside the left and right main frames 20 in the vehicle width direction, left and right front side covers 26 and 26 that cover the outside of the fuel tank 4 and the radiator 5 are disposed. Rear side covers 27 and 27 are disposed outside the left and right seat rails 23 and 23 to cover the outside of the exhaust device 7.

  The intake device 6 of the motorcycle 1 of the present embodiment takes in air from an intake port that opens in the front wall 3b of the engine 3 and discharges exhaust gas because it opens in the rear wall 3d. Is adopted.

  The exhaust device 7 has an exhaust pipe 7a connected to the rear wall 3d of the engine 3 and a muffler 7b connected to the downstream end of the exhaust pipe 7a. The muffler 7 b is arranged to extend in the front-rear direction on the right outer side in the vehicle width direction at the boundary between the seat 8 and the rear fender 17.

  The exhaust pipe 7 a extends rearward from the rear wall 3 d of the engine 3 to the right side of the rear cushion 16, and is disposed so as to pass through the front of the rear fender 17 and below the seat 8.

  The exhaust pipe 7a is bent so as to form a substantially ring shape in the vehicle width direction in the space between the rear cushion 16, the seat 8, and the rear wheel 15. By thus bending the exhaust pipe 7a in an annular shape, the required length of the exhaust pipe 7a is secured while adopting the rear exhaust system.

  The intake device 6 includes an air cleaner 30 disposed on the front side of the fuel tank 4, left and right outside air introduction ducts (not shown) connected to the upper end of the air cleaner 30 and extending forward of the vehicle, and the air cleaner. And an intake pipe (not shown) that connects the bottom portion of 30 and an intake port opened in the front wall 3b of the engine 3 in the vertical direction.

  The fuel tank 4 is mounted on the upper surfaces of the front portions of the left and right main frames 20 and extends rearward and obliquely downward along the main frame 20.

  A rear upper surface 4d of the upper wall 4b of the fuel tank 4 is a flat inclined surface that is rearwardly lowered. A fuel cap 4a for opening and closing the fuel filler opening 4e is attached to the front end portion of the upper wall 4b of the fuel tank 4. Furthermore, a recess 4 c into which the upper part of the air cleaner 30 enters is formed in the front wall of the fuel tank 4.

  The rear fender 17 has a generally arcuate shape with a transverse cross-section opening downward, and a rear half 17a that extends substantially linearly rearward from the rear end face 8d of the seat 8 and a rear half 17a. And a front half portion 17b that extends downward from the seat 8 and is formed in a stepped shape from the front edge. The front half 17 b is curved forward and is fixed to the left and right seat rails 23 and the seat stays 24.

  The seat 8 has a structure in which a cushion 35 is stuck on a seat bottom plate 34 and the outer surface of the cushion 35 is covered with a skin 36 (see FIGS. 3, 8, and 9).

  The seat 8 has a substantially rectangular shape with the front-rear direction dimension longer than the vehicle width direction dimension in plan view (see FIG. 7). The front end portion 8 a of the seat 8 is located in the vicinity of the fuel supply port 4 e of the upper wall 4 b of the fuel tank 4, and the rear end portion 8 b is located at the rear end portion of the seat rail 23.

  Further, when the seat 8 is viewed from the side of the vehicle, the upper surface of the front end portion 8a is positioned slightly higher than the upper surface of the rear end portion 8b, and the upper surface of the center portion (hip point) 8c in the front-rear direction is from the rear end portion 8b. It has a gentle curve that curves slightly downward so that it is low.

  In the motorcycle 1 of this type, the rider greatly changes its posture during traveling in view of its use. For example, an operation is performed in which the waist is moved as far back as possible during japping and is moved forward during cornering. Therefore, the longitudinal length of the seat 8 is longer than that of other motorcycles, and the vehicle width dimension is narrower than that of other motorcycles. Also in the fuel tank 4, the vehicle width dimension is reduced according to the vehicle width dimension of the seat 8.

  The rear end 8b of the seat 8 is formed with a concave portion 8e having a concave shape forward (see FIG. 7). When viewed from above, the concave portion 8e has a shape in which a central portion in the vehicle width direction of the rear end portion 8b of the seat 8 is cut out into a generally square shape.

  The lower surfaces of the left and right portions 8e ′ and 8e ′ of the recess 8e are in contact with the upper surface of the rear fender 17. Specifically, the left and right rear end portions 34 a and 34 a of the seat bottom plate 34 are bent downward, and the edge portion 34 a ′ of the left and right rear end portion 34 a is in contact with the front half portion 17 b of the rear fender 17. . As a result, the load of the rider seated on the rear end portion 8b of the seat 8 is transmitted from the left and right side portions 8e 'of the recess 8e to the left and right seat rails 23 and the seat stay 24 via the rear fender 17.

  The recess 8e of the seat 8 and the rear fender 17 form left and right openings 37, 37 that open toward the rear of the vehicle. The left and right openings 37 constitute a rear end opening of a gap 37a extending in the front-rear direction provided between the left and right sides 8e 'of the recess 8e and the front half 17b of the rear fender 17. As a result, the heat of the exhaust pipe 7a trapped below the seat 8 passes through the gap 37a between the seat bottom plate 34 and the front half 17b of the rear fender 17 and is directed upward from the left and right openings 37 to the rear half 17a. (See arrow a in FIG. 7).

  The seat 8 includes a seat height adjusting mechanism A that can adjust the height thereof. The seat height adjusting mechanism A includes a fixing portion 40 that fixes the bottom portion of the rear end portion 8b of the seat 8 to the seat rail 23 so that the position in the front-rear direction can be adjusted, and a central portion that is located in front of the fixing portion 40 of the seat 8. A height variable mechanism 41 for locking the bottom of 8c to the seat rail 23 so that the height position can be adjusted, and a locking portion 42 for locking the bottom of the front end of the seat 8 to the fuel tank 4 are provided.

  A front portion 34 b located below the front end portion 8 a of the seat bottom plate 34 of the seat 8 is formed so as to incline forward along the rear upper surface 4 d of the fuel tank 4. When the seat 8 is moved forward, the front end portion 8a is moved forward and obliquely upward along the forward rising slope.

  The engaging portion 42 engages with a locking groove 34e formed in the seat bottom plate 34 with a guide pin 42c disposed so as to protrude upward in the vehicle width direction central portion of the rear upper surface 4d of the fuel tank 4. It has a structure to stop.

  The guide pin 42c has a shaft portion 42a fixed to the fuel tank 4 by welding or the like, and a disk-shaped head portion 42b formed on the upper end surface of the shaft portion 42a.

  The locking groove 34e is formed in a tunnel portion 34c formed to form a tunnel shape in the vehicle width direction central portion of the front portion 34b of the seat bottom plate 34. The locking groove 34e extends long in the front-rear direction, and an insertion hole 34d having a size that allows the head 42b of the guide pin 42 to be inserted is formed at the front end thereof (see FIG. 6).

  By inserting the head portion 42b of the guide pin 42c through the insertion hole 34d and engaging the lower surface of the head portion 42b with the upper surface of the edge portion of the engagement groove 34ec, the seat 8 is arranged in the vehicle width direction and the rear portion of the fuel tank. Movement in a direction away from the upper surface 4d is restricted. The seat 8 is allowed to move in the front-rear direction.

  The fixing portion 40 is a combination of a pair of left and right fixing plates 40a and 40a attached to the rear end portion of the seat bottom plate 34, and the left and right seat rails 23 and the left and right seat stays 24. Left and right seat brackets 44, 44 fixed to the section.

  Each seat bracket 44 has a fender fixing portion 44b protruding rearward and a sheet fixing portion 44a protruding upward, and a bolt hole (fixing hole) 44c is formed in the seat fixing portion 44a.

  Each of the fixing plates 40a is formed with a front fixing hole 40b and a rear fixing hole 40c so as to be positioned at substantially the same height at the front and rear, and the front and rear fixing holes 40b, 40c is selectively coupled to the bolt hole 44c by a bolt 47.

  By tightening the bolt 47 with the front fixing hole 40b aligned with the bolt hole 44c of the seat fixing portion 44a, the seat 8 is positioned on the rear side (second fixing position, see FIG. 4). Further, by tightening the rear fixing hole 40c in the bolt hole 44c, the seat 8 is positioned on the front side (first fixing position, see FIG. 5). Note that the height position of the rear end portion 8b of the sheet 8 hardly changes even if any of the front and rear fixing holes 40b, 40c is coupled to the bolt hole 44c.

  Seat load receiving members 45 and 45 are disposed and fixed on the front side of the seat bracket 44 of the left and right seat rails 23. Further, seat load transmission members 46 and 46 that can come into contact with the sheet load receiving member 45 are attached to the front portion of the seat bottom plate 34 from the fixing portion 40.

  The left and right seat load transmission members 46 include a low position transmission portion 46a located on the upper surface of the seat load receiving member 45 when the seat 8 is located on the rear side, and the seat 8 is located on the front side. It sometimes has a height transmitting portion 46b located on the upper surface of the seat load receiving member 45. As a result, the rider's load acting on the seat 8 is transmitted from the seat load transmitting member 46 to the vehicle body frame 2 via the seat load receiving member 45.

  The height varying mechanism 41 is attached to the locking member 50 disposed in front of the seat load receiving member 45 and the rear side of the seat bottom plate 34 in the vicinity of the central portion 8c. It has a pair of left and right locked members 51 and 51 to be stopped.

  The locking member 50 includes a cross member 50 a that is fixed over the left and right seat rails 23 and 23, and a flange portion 50 b that is bent so as to be parallel to the seat rail 23.

  The locked member 51 includes an upper locked portion 51a and a lower locked portion 51b in two stages having different height positions. The upper latched portion 51a and the lower latched portion 51b are configured by a notch groove into which the flange portion 50b of the engagement member 50 can be inserted, and the lower latched portion 51b is the upper latched portion 51a. It is formed so as to be located on the rear side.

  The vertical interval between the upper locked portion 51 a and the lower locked portion 51 b of the locked member 51 is set to a required seat height adjustment amount, and the front-rear direction interval is the amount of movement of the fixed portion 40 in the front-rear direction. It is set to correspond to.

  When the sheet 8 is set to the standard height, the sheet 8 is fixed at the second fixing position. Specifically, with the front fixing hole 40b of the fixing portion 40 aligned with the bolt hole 44c, the fixing portion 40 is fixed to the sheet fixing portion 44a with the bolt 47, and the hook portion 50b of the locking member 50 is engaged with the upper locking portion 51a. Stop. Further, the guide pin 42c of the fuel tank 4 is engaged with the front portion of the engagement groove 34e of the seat bottom plate 34 (see FIG. 4).

  When the seat 8 is set at a high place, the seat 8 is fixed at the first fixing position. Specifically, the bolt 47 is removed to release the fixing portion 40, the seat 8 is once shifted rearward, and the upper locking portion 51 a is removed from the flange portion 50 b of the locking member 50.

  Then, with the seat bottom plate 34 engaged with the guide pins 42c, the rear portion of the seat 8 is lifted up slightly and moved forward. Then, as the seat 8 moves to the front side, the front portion 34b of the seat bottom plate 34 moves diagonally forward and upward along the inclined surface of the rear upper surface 4d of the fuel tank 4. At this time, the hooked portion 50 b of the locking member 50 is locked to the lower locked portion 51 b of the locked member 51, and finally, the rear fixing hole 40 c and the bolt hole 44 c are aligned, and the fixing plate 40 a is fixed by the bolt 47. And fixed to the sheet fixing portion 44a (see FIG. 5).

  In this case, as compared with the case where the seat 8 is positioned on the rear side (second fixed position), the front portion of the seat 8 rotates upward with the bolt hole 44c as the center. Therefore, the central portion 8c of the seat 8 is positioned higher than the standard height by h, and the front end portion 8a moves slightly higher than the central portion 8c. On the other hand, with respect to the rear end portion 8b of the seat 8, the fixing plate 40a only moves substantially horizontally forward, so the seat height does not change.

  Thus, according to this embodiment, the rear end portion 8b of the seat 8 can be adjusted in the front-rear direction position, and the height positions of the front end portion 8a and the central portion 8c of the seat 8 can be adjusted. The height of the front end portion 8a and the central portion 8c can be changed without changing the height of the rear end portion 8b of the seat 8. Accordingly, when jumping or overcoming an obstacle, the rider can smoothly move the waist to the rear end portion 8b of the seat 8, and the motorcycle 1 for the motocrosser can adjust the seat height. It is possible to meet the rider's demand when providing a mechanism.

  Further, since the concave portion 8e having a concave shape is formed in the rear end portion 8b of the sheet 8, the height of the sheet rear end portion 8b can be further reduced while ensuring the necessary sheet length. In other words, when the height of the rear end portion 8b of the seat 8 is lowered, the seat height avoids interference with the portion 17b 'on the vehicle center line L of the front half portion 17b of the rear fender 17 of the seat rear edge portion 8b'. Limited to possible heights. In the case of a conventional sheet that does not include the recess 8e at the rear end of the sheet, the height is indicated by a two-dot chain line in FIGS. On the other hand, in the present embodiment, since the concave portion 8e is provided, it is equivalent to the rear edge portion 8b 'of the sheet 8 being advanced to 8b ". As a result, as shown by the solid lines in FIGS. The height of the rear end portion 8b can be reduced by the dimension b as compared with the conventional structure.

  In the structure of the present embodiment, the recess 8e is provided, but the cushioning properties for the left and right side portions 8e 'are ensured. When the rider moves his / her waist to the rear end portion of the seat, the left and right tail low bones e of the rider are positioned on the left and right side portions 8e ′ and do not directly hit the hard rear fender 17. Therefore, the ride comfort is hardly lowered by providing the recess 8e.

  In this embodiment, the height varying mechanism 41 is attached to the locking member 50 attached to the seat rail 23 and the seat bottom plate 34, and the two upper locked portions 51 a and the lower side covers that have different vertical heights. Since the configuration includes the locked member 51 having the locking portion 51b, it is possible to adjust the seat height with a simple structure, to suppress an increase in cost, and to easily adjust the height of the seat 8. Can be done.

  In the present embodiment, the rear upper surface 4d of the upper wall 4b of the fuel tank 4 has a rearwardly inclined surface, and the front portion 34b of the seat bottom plate 34 of the seat 8 is disposed along the rear upper surface 4d. As the portion 40 is positioned on the front side, the front portion 34b moves obliquely forward and upward along the inclined surface of the rear upper surface 4d. As a result, it is possible to change the seat height without causing a gap between the fuel tank 4 and the seat 8, and to prevent problems such as deterioration of appearance or lidar clothes hanging on the gap. .

  In the present embodiment, since the opening 37 is formed by the lower surface of the recess 8e and the upper surface of the rear fender, the heat of the exhaust pipe 7a accumulated below the seat 8 can be released to the outside from the opening 37, It is possible to prevent heat from being accumulated below the sheet 8.

  That is, since the motorcycle 1 of the present embodiment employs the front intake and rear exhaust system, the exhaust pipe 7 a is disposed in front of the rear fender 17 and below the seat 8. For this reason, the heat of the exhaust pipe 7 a tends to be trapped below the seat 8 and in front of the rear fender 17. In the present embodiment, such heat of the exhaust pipe 7a can be discharged, and adverse effects due to heat can be prevented.

  In the configuration of the height varying mechanism 41 of the present invention, the locking member may be attached to the seat side and the locked member may be attached to the vehicle body frame side. In the configuration of the fixing portion 40, the fixing plate may be provided on the frame side and the seat bracket may be provided on the seat side.

  In the above-described embodiment, the case where the seat height is adjusted in two stages has been described.

1 is a side view for explaining a motorcycle according to an embodiment of the present invention. FIG. 3 is a side view of a seat mounted on the motorcycle. It is an exploded side view in the state where the sheet was removed. It is a side view which shows the state which attached the said sheet | seat to standard height. It is a side view which shows the state which attached the said sheet | seat to the high place. It is a top view of the latching mechanism part to the fuel tank of the said sheet | seat. It is a top view of the sheet. It is sectional drawing (VIII-VIII sectional view taken on the line of FIG. 7) of the said sheet | seat. It is sectional drawing (the IX-IX sectional view taken on the line of FIG. 7) of the said sheet | seat. It is sectional drawing (XX sectional drawing of FIG. 7) of the said sheet | seat. It is sectional drawing (XI-XI sectional view taken on the line of FIG. 10) of the said sheet | seat.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 3 Engine 4 Fuel tank 4b Upper wall 4d Rear upper surface 8 Seat 8a Front end part 8b Rear end part 8c Center part (front side part)
34e Locking groove 40 Fixing part 40a Fixing plate 40b, 40c Front side fixing hole, Rear side fixing hole 41 Height variable mechanism 42 Locking part 42c Guide pin 44 Seat bracket 44c Bolt hole (fixing hole)
47 Bolt 50 Locking member 51 Locked member 51a Upper locked portion 51b Lower locked portion

Claims (7)

A motorcycle comprising a vehicle body frame, a fuel tank mounted on the vehicle body frame, and a seat attached to the vehicle body frame, the upper surface of the fuel tank being arranged so that at least a part of a front lower surface thereof is along the upper surface. In
A fixing portion for fixing the rear portion of the seat to the vehicle body frame so that the position in the front-rear direction can be adjusted;
The height of the front side portion of the seat when the rear portion of the seat is fixed at the first fixed position, the rear portion of the seat from the first fixed position. A motorcycle comprising: a height variable mechanism configured to be higher than when fixed to a second fixed position located on the rear side. The motorcycle according to claim 1,
2. The motorcycle according to claim 1, wherein the fixing portion includes a fixing plate provided on one of the vehicle body frame and the seat, and a seat bracket provided on the other and coupled to the fixing plate. The motorcycle according to claim 2,
A fixing hole is formed in the seat bracket,
The fixing plate is formed so that the front fixing hole and the rear fixing hole are spaced at the front and rear and are at substantially the same height position,
A motorcycle characterized in that either the front fixing hole or the rear fixing hole is coupled to the fixing hole with a bolt. The motorcycle according to claim 1,
The height varying mechanism includes a locking member provided on one of the body frame and the seat, and a locked member provided on the other and having a plurality of locked portions having different vertical heights. A motorcycle characterized by having a motorcycle. The motorcycle according to claim 1,
The rear upper surface of the fuel tank has a rearwardly inclined surface, and the front part of the seat moves obliquely forward and upward along the inclined surface of the fuel tank as the seat is positioned on the front side. Motorcycle characterized by The motorcycle according to claim 5,
Between the rear upper surface of the fuel tank and the front lower surface of the seat, there is a locking portion that allows the front and rear movement of the seat and prevents the fuel tank from moving away from the rear upper surface. A motorcycle characterized by being formed. The motorcycle according to claim 6,
The locking portion includes a guide pin disposed so as to protrude upward on a rear upper surface of the fuel tank, and a locking groove formed on a bottom plate of the seat and locked by the guide pin. A characteristic motorcycle.

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