JP2006021638A - Motorcycle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motorcycle having a fuel tank attachment structure by reducing the number of parts with a simple structure and to improve ease of assembly and serviceability. <P>SOLUTION: This motorcycle has a head pipe, vehicle body frames 6, 6 branched to left and right at a rear portion of the head pipe, and a fuel tank 7. A fuel tank lower portion 7a is disposed between the left and right vehicle body frames 6, 6, a boss 9 protruded inward is integrated and formed on an inner side for each of the left and right vehicle body frames 6, 6, dampers 10 attached at the respective left and right bosses 9 are provided, a damper sandwiching portion 12a which is brought into pressure contact with the damper 10 and can slide the damper 10 in a longitudinal direction is formed at a side surface of the fuel tank lower portion 7a, and a fixing portion for fixing the fuel tank at the vehicle body frame is formed in front of the damper sandwiching portion 12a of the fuel tank 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a motorcycle, and more particularly to a fuel tank mounting structure thereof.

The body frame of a motorcycle has a shape that is coupled to the head pipe and is provided in a single rear state as it is, and a shape that is provided in two states by branching left and right behind the head pipe. In either case, the fuel tank is supported by the vehicle body frame. There are cases where two body frames branched to the left and right are used due to strength and design requirements. When the fuel tank is supported by the two left and right vehicle body frames, the lower portion of the fuel tank is formed in a shape sandwiched between the left and right vehicle body frames because of space arrangement. When attaching fuel tanks to these two left and right body frames, cross members and brackets that connect the left and right body frames are provided and the fuel tanks are fixed on them, which increases the number of parts and the structure. become.

  On the other hand, Patent Document 1 discloses a conventional fuel tank mounting structure for a motorcycle including two left and right body frames. The fuel tank mounting structure disclosed in Patent Document 1 is to restrict and fix the movement of the vehicle body in the front-rear and up-down directions using bolts and nuts at four positions on the front and rear with respect to the left and right vehicle body frames.

  However, in the fuel tank mounting structure of Patent Document 1, since the fuel tank is fastened and fixed to the vehicle body frame with four bolts and nuts, the number of parts increases, the mounting work becomes complicated, and maintenance becomes troublesome.

Japanese Patent Laid-Open No. 2004-98861

  The present invention has been made in consideration of the above prior art, and an object of the present invention is to provide a motorcycle having a fuel tank mounting structure in which the number of parts is reduced with a simple configuration and the assemblability and maintainability are improved.

  In order to achieve the above object, a first aspect of the present invention is a motorcycle including a head pipe, a body frame branched to the left and right behind the head pipe, and a fuel tank, between the left and right body frames. A fuel tank lower portion is disposed on each of the left and right body frames, and a boss projecting inward is integrally formed on each inner side of the left and right body frames, and includes a damper attached to each of the left and right bosses. Forming a damper holding portion that is in pressure contact with the damper and capable of sliding the damper in the front-rear direction, and a fixing portion that fixes the fuel tank to the vehicle body frame is formed in front of the damper holding portion of the fuel tank. A motorcycle characterized by the above.

The invention of claim 2 is characterized in that, in the invention of claim 1, the damper clamping part has a movement preventing part for stopping the damper from moving backward.

  The invention of claim 3 is characterized in that, in the invention of claim 1, the damper is cap-shaped.

  According to a fourth aspect of the present invention, in the second aspect of the present invention, the damper clamping portion is composed of a part of a U-shaped bracket whose front side is open.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the fixing portion is a support bracket fixed to a front end portion of the fuel tank, and a key cylinder holding member for holding the key cylinder is provided on the body frame. The support bracket is fixed to the key cylinder holding member via a fastening member.

  According to a sixth aspect of the invention, in the first aspect of the invention, the left and right dampers are integrally formed with an insulating sheet, and the insulating sheet covers a lower surface of the fuel tank.

A seventh aspect of the invention is characterized in that, in the first aspect of the invention, the damper clamping portion includes a pair of parallel clamping plates, and the clamping plates are inclined forward and downward relative to the horizontal.

  According to the present invention, each of the left and right body frames has, for example, a U-shaped cross-section with an open inner side, and a boss projects integrally on the inner surface side. The fuel tank can be supported via the damper, and the following effects can be obtained.

1. Since the boss is integrally formed with the body frame, the number of parts is reduced and the structure is simplified.
2. Since the boss protrudes from the inner surface of the body frame having a U-shaped cross section, the boss can be easily formed integrally with the body frame by casting.
3. Since two parallel damper holding parts can be slid and mounted on the damper, the mounting and removing work can be facilitated.
4). Because the damper clamping part at the rear of the fuel tank slides, the fixed part of the front end of the fuel tank to the body frame side can be used as a reference for positioning, and the fuel tank can be easily and highly accurate with respect to the body frame and body cover. Therefore, it is always positioned at a certain optimum position.
5. With the fixed part at the front end of the fuel tank removed, the fuel tank can be rotated around the damper holding part at the rear and the front part of the tank can be lifted up. Inspection is possible, and maintainability during maintenance is improved.

  According to the first aspect of the present invention, since the boss protruding inside the body frame is integrally formed, the number of parts can be reduced. In this case, if the body frame is formed by casting, the boss can be easily formed integrally. For example, a cast body having a U-shaped cross section can be used as the body frame, but other shapes may be used.

  A fuel tank can be attached to and detached from the vehicle body frame by mounting a damper on the boss of the vehicle body frame and sliding a damper holding portion of the fuel tank on the damper. As a result, the fuel tank can be easily attached and removed.

  According to the second aspect of the present invention, when the damper holding portion is slid forward along the damper and the fuel tank is mounted, the forward movement is stopped by the movement blocking portion, so that the damper holding portion falls out forward. This improves installation workability. In addition, the fuel tank can be moved to the movement blocking portion and rotated about the movement blocking portion to lift the front portion of the tank. In this state, the fuel tank is held and the inside can be inspected.

  According to the invention of claim 3, since the damper is cap-shaped, not only the peripheral part where the damper clamping part is slidably contacted but also the top part is provided with elasticity, so that the vibration isolating action of the fuel tank is obtained in the vehicle width direction, It is fixed and held stably.

  According to the invention of claim 4, by bending one belt-like sheet metal to form a U-shaped bracket, it is possible to easily manufacture and assemble the damper clamping portion that becomes the slide portion and the movement blocking portion at the end thereof. Handleability is improved.

According to the invention of claim 5, when the front end portion of the fuel tank is fixed to the key cylinder holding member with a fastening member such as a bolt, the damper clamping portion at the rear portion of the fuel tank is slid and positioned. Can be used as a reference hole for alignment without forming a loose hole, and positioning work can be facilitated. In addition, since the fuel tank is attached to the vehicle body frame via the key cylinder holding member, a compact component arrangement is achieved and space can be used effectively.

  According to the sixth aspect of the present invention, the metal material is not rubbed against the harness or the like disposed on the lower surface side of the fuel tank, and the harness is prevented from being deteriorated or disconnected.

  According to the seventh aspect of the present invention, when the fuel tank is assembled, it can be inserted somewhat downward from the rear, and the assembling workability is improved.

FIG. 1 is an external view of a motorcycle to which the present invention is applied.
The motorcycle 1 includes an under bracket 3 and a handle crown 4 through which left and right front forks (only the left side in the figure) 2 are inserted. A steering shaft (not shown) is fixed to the center of the under bracket 3 and the handle crown 4 in the vehicle width direction. The steering shaft is inserted through the head pipe 5 fixed to the vehicle body frame side.

  A main frame 6 constituting a vehicle body frame is coupled to the rear of the head pipe 5. The main frame 6 branches right and left behind the head pipe 5. The lower portion of the fuel tank 7 is disposed between the main frame 6 branched to the left and right, and is fixedly held.

  A key cylinder holding member 30 that holds a key cylinder (not shown) is fixed to the main frame 6 behind the handle crown 4. The front end side surface of the fuel tank 7 is covered with a top cover 31.

FIG. 2 is an explanatory view of the main configuration of an embodiment of the present invention.
A lower portion 7 a of the fuel tank 7 is disposed between the left and right main frames 6. Each of the left and right main frames 6 has a U-shaped cross-sectional shape with the inside opened. A boss 9 protruding inward is integrally formed on the inner surface side of each main frame 6. A cap-shaped damper 10 made of an elastic insulating material such as rubber is put on the tip of the boss 9. The left and right dampers 10 are integrally formed with the elastic insulating sheet 11 (see FIG. 6). The elastic insulating sheet 11 covers the lower surface of the fuel tank 7 with the fuel tank 7 mounted.

  U-shaped brackets 12 are fixed to the left and right side surfaces of the fuel tank lower portion 7a via a plate 13, for example, by welding. As shown in (B), the U-shaped bracket 12 is open at the front, and presses and clamps the damper 10 attached to the boss 9.

  When attaching the fuel tank 7, a U-shaped bracket 12 is fitted from the rear of the damper 10, the damper 10 is sandwiched between the parallel damper clamping portions 12 a and 12 a constituting both sides of the U-shaped bracket 12, and the U-shaped bracket is mounted on the damper 10. Slide 12 to position. Thereafter, as will be described later, the front end portion of the fuel tank 7 is fixed to the main frame side.

FIG. 3 is an inner view of the main frame 6 on the right side of the vehicle body.
The main frame 6 is a cast body made of, for example, die casting, and reinforcing ribs 17 are formed on the inner surface thereof. Further, the above-mentioned boss 9 protrudes and is integrally formed at a substantially central portion of the main frame 6.

  A head pipe holding portion 6a is formed at the front end portion of the main frame 6, and the head pipe 5 (see FIG. 1) is sandwiched between the head pipe holding portion of the main frame on the left side of the vehicle body (not shown). The left and right main frames 6 and 6 are fixed by bolts (not shown) through six bolt insertion holes 15 with the head pipe interposed therebetween.

  The rear portions of the left and right main frames 6 are fixed by bolts (not shown) through three bolt insertion holes 16. Therefore, the left and right main frames 6 are integrally joined at the front end portion and the rear end portion, and are separated from each other at the middle portion. A fuel tank is attached to the left and right portions.

4 and 5 are a central sectional view and a bottom view of the fuel tank.
A tank fixing bracket 19 is fixed to the front end portion of the fuel tank 7 by welding, for example. An attachment hole 21 for attaching a top cover 31 (see FIG. 1) covering the front and side surfaces of the fuel tank 7 exposed at the upper part of the main frame 6 and the fuel tank 7 are attached to the tank fixing bracket 19 on the vehicle body frame side. A mounting hole 22 is formed. The fuel tank 7 is fixed to the key cylinder holding member 30 (see FIG. 1) through two mounting holes 22 of the tank fixing bracket 19 with bolts (not shown). The key cylinder holding member 30 is fixed to the main frame 6 with bolts or the like. Thereby, the fuel tank 7 is fixed to the vehicle body frame side. At this time, as described above (FIG. 2), the U-shaped bracket 12 at the rear of the fuel tank is slid back and forth with respect to the damper 10 mounted on the boss integral with the main frame 6. 7 is aligned and fixed to the main frame 6 at an optimum position set in advance with reference to the mounting hole 22 of the tank fixing bracket 19 at the front end.

  A fuel filler port 18 into which a fuel cap is fitted is formed in the upper part of the fuel tank 7. An opening 20 for mounting a fuel pump is formed on the lower surface of the lower portion 7 a of the fuel tank 7. Further, as described above, U-shaped brackets 12 fixed on the plate 13 are fixed to both sides of the fuel tank lower portion 7a. As shown in FIG. 4, the U-shaped bracket 12 is inclined so that the opening side is somewhat lowered with respect to the horizontal. This is to improve workability when the U-shaped bracket 12 is fitted from the rear side of the damper 10 (see FIG. 2) when the fuel tank is assembled.

  In FIG. 5, reference numeral 23 denotes a top cover mounting grommet mounting piece. Reference numerals 24 and 25 denote outlets for a drain hose and an overflow liquid discharge hose communicating with the fuel filler port 18, respectively.

FIG. 6 is an explanatory view of the shape of the elastic insulating sheet integrally formed with the damper.
On both the left and right sides of an elastic insulating sheet 11 made of an elastic insulating material such as rubber, dampers 10 are integrally formed with gear-shaped cuts on the outer periphery to increase flexibility and make it easy to mount. Bending pieces 11 a are formed on the left and right edges of the elastic insulating sheet 11. As shown in FIG. 2, the bent piece 11 a is in close contact with the inner surface of the upper edge of the main frame 6, and prevents a cable, a harness, or the like disposed in the main frame 6 from coming out.

FIG. 7 is an explanatory diagram of the structure of the vehicle body structure at the front portion of the fuel tank according to the embodiment of the present invention.
A head pipe 5 (a front end portion of the main frame 6 in front of the center axis in the figure) extends between the upper handle crown 4 and the lower under bracket 3 between the head pipe holding portion 6a at the front end portion of the main frame 6 of the die cast body. Only the portion exposed to the upper side is shown). A steering shaft 43 is provided through the head pipe 5. The steering shaft 43 is fixed to the handle crown 4 and the under bracket 3, respectively. The steering shaft 43 is rotatable with respect to the head pipe 5 via upper and lower bearings 42. The head pipe 5 is integrally fixed to the main frame 6.

  A cylinder stay mounting piece 6c is integrally formed so as to protrude from the upper edge of each main frame 6 branched to the left and right behind the handle crown 4. A key cylinder holding member (cylinder stay) 30 is fixed to the cylinder stay mounting piece 6c by bolts 33 and 34 from the left and right side surfaces. The key cylinder holding member 30 accommodates the key cylinder 8 and is fixed from below by a bolt 36.

  A key 41 is inserted into the upper surface of the key cylinder 8. By the key operation, the lock pin 35 protrudes, protrudes forward of the key cylinder holding member 30, and fits into the lock hole 44 of the handle crown 4. As a result, the handle is locked.

  A fuel tank mounting portion 37 a is provided at the rear portion of the key cylinder holding member 30. A bracket 46 fixed to a front end portion of a fuel tank (not shown) is fixed to the fuel tank mounting portion 37a with a bolt 47.

FIG. 8 is an explanatory diagram of the configuration of the key cylinder holding member 30. (A) is a top view and (B) is a side view.
The key cylinder holding member 30 is a cast product, and a key cylinder insertion hole 39 and a fuel tank mounting screw hole 37 are formed on the upper surface, and screw holes 33a and 34a for mounting to the main frame are formed on the side surface. As described above, the key cylinder holding member 30 is fixed to the attachment piece 6c (FIG. 7) of the main frame 6 behind the handle crown 4 with the bolts 33 and 34. 36a is a bolt hole into which a bolt 36 (FIG. 7) for locking the key cylinder 8 from the lower side is screwed. By fixing the key cylinder using the cast key cylinder holding member in this way, the strength is increased and the appearance is improved as compared with the case of using a sheet metal. Therefore, mischief and theft can be prevented, and a decorative cover for covering the sheet metal holding the key cylinder is not necessary.

  A screw hole 37 is formed in the fuel tank mounting portion 37a at the rear of the key cylinder holding member 30, and a bolt 47 is screwed into the screw hole 37 to fix the bracket 46 on the fuel tank side.

  7 and FIG. 8 corresponds to the tank fixing bracket 19 of FIG. 5 although the shape is different.

  The present invention can be applied to a motorcycle in which a fuel tank is fixedly held between two left and right main frames.

1 is an external view of a motorcycle to which the present invention is applied. The principal part structure explanatory drawing of the fuel tank mounting structure of this invention. The internal view of the main frame which concerns on this invention. The center sectional view of the fuel tank concerning the present invention. The bottom view of the fuel tank of FIG. The shape explanatory drawing of the elastic insulation sheet integrated with the damper concerning the present invention. The vehicle body structure explanatory drawing of the fuel tank front part of the Example of this invention. The structure explanatory view of the key cylinder holding member of the present invention.

Explanation of symbols

1: motorcycle, 2: front fork, 3: under bracket, 4: handle crown, 5: head pipe, 6: main frame, 6a: head pipe holding portion, 6c: key cylinder mounting piece, 7: fuel tank, 7a : Lower part of fuel tank, 8: Key cylinder, 9: Boss, 10: Damper, 11: Elastic insulating sheet, 11a: Bending piece, 12: U-shaped bracket, 12a: Damper clamping part, 13: Plate, 15: Bolt insertion hole 16: Bolt insertion hole, 17: Rib, 18: Refueling port, 19: Tank fixing bracket, 20: Opening for mounting the fuel pump, 21: Mounting hole for the top cover, 22: Mounting hole for the fuel tank, 23: Top Cover mounting hole, 24: Drain hose outlet hole, 25: Overflow hose outlet hole, 30: Key cylinder holding member, 3 : Top cover, 33, 34: Bolt, 35: Lock pin, 36: Bolt, 36a: Bolt hole, 37: Screw hole, 37a: Fuel tank mounting part, 41: Key, 42: Bearing, 43: Steering shaft, 44 : Lock hole, 45: Grommet, 46: Bracket of fuel tank, 47: Bolt.

Claims (7)

A motorcycle equipped with a head pipe, a body frame branched right and left behind the head pipe, and a fuel tank,
A fuel tank lower part is arranged between the left and right body frames,
Inside each of the left and right body frames, bosses projecting inward are integrally formed,
With dampers attached to the left and right bosses,
On the side surface of the lower part of the fuel tank, a damper clamping part is formed which is pressed against the damper and can slide the damper in the front-rear direction.
2. A motorcycle according to claim 1, wherein a fixing portion for fixing the fuel tank to the vehicle body frame is formed in front of the damper clamping portion of the fuel tank.   2. The motorcycle according to claim 1, wherein the damper clamping unit includes a movement blocking unit that stops the movement of the damper to the rear. 3.   The motorcycle according to claim 1, wherein the damper has a cap shape.   The motorcycle according to claim 2, wherein the damper clamping portion is formed of a part of a U-shaped bracket whose front side is open.   The fixing portion is a support bracket fixed to a front end portion of the fuel tank, a key cylinder holding member holding a key cylinder is fixed to the body frame, and the support bracket is fastened to the key cylinder holding member. The motorcycle according to claim 1, wherein the motorcycle is fixed via a vehicle.   The motorcycle according to claim 1, wherein the left and right dampers are integrally formed with an insulating sheet, and the insulating sheet covers a lower surface of the fuel tank. The motorcycle according to claim 1, wherein the damper clamping portion includes a pair of parallel clamping plates, and the clamping plates are inclined forward and downward with respect to the horizontal.

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