JPH04238787A - Rear wheel support structure for motorcycle - Google Patents

Abstract

PURPOSE:To obtain a rear wheel support structure permitting the arrangement of a muffler without sacrificing a body banking angle and riding comfort, and further permitting easy wheel mounting or demounting. CONSTITUTION:In a motorcycle having such a cantilever structure as supporting a rear wheel 30 with a rear swing arm 6, a coupled structure to permit the slidable mounting and demounting of a rear wheel 30 only in a single direction orthogonal with an axle, is constituted between the outer side of the flange section 23b of a rear axle 23 and the inner side of the hub 30a of a rear wheel 30. A rear wheel support structure for the motorcycle is thereby obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure in which a rear swing arm cantilevers a rear wheel in a two-wheeled vehicle.

0002

2. Description of the Related Art Conventionally, this type of two-wheeled vehicle has generally had a rear wheel support structure as shown in FIG.

[0003] A rear swing arm 01 that is swingably supported on the vehicle body frame is aligned with the center line X- in the width direction of the vehicle body.
It is arranged offset to the left side from X, and is curved slightly to the center line
An axle holder part 02 is formed at the rear end located closer to -X, and a bearing holder 03 is fitted and supported therein. The bearing holder 03 rotatably supports the rear axle 05 via the bearing 04, and a caliper support member 06 is fitted into the protruding cylindrical portion on the side of the center line XX. is supported.

[0004] The rear axle 05 supported by the bearing holder 03 has a support member 09 that supports the chain sprocket 08 fitted into a portion 05a that protrudes to the left of the bearing holder 03, while a support member 09 that supports the chain sprocket 08 is fitted to a portion 05a of the rear axle 05 that protrudes to the left of the bearing holder 03. Protruding part 05b
A flange 05c is formed near the bearing holder 03, and the hub 01 in the center of the rear wheel 010
0a is fitted into the protrusion 05b of the rear axle 05, and the bottom surface of the hub 010a abuts and fits into the flange 05c.

Bosses 011 are fixed to the flange 05c of the rear axle 05 at several locations so as to protrude to the right, and the hub 010a of one rear wheel 010 has the bosses 011 fixed thereto.
A hole 010b is formed corresponding to the boss 011, and by fitting the boss 011 into the hole 010b, the rotation of the rear axle 05 is reliably transmitted to the rear wheel 010.

[0006] A brake disc 012 is fixed to the flange 05c of the rear axle 05 with bolts and nuts.

The rear axle 05 has a cylindrical shape and has a locking portion 05d with a reduced inner diameter formed at a predetermined position inside the rear axle 05, and an axle bolt 013 inserted into the rear axle 05 from the left side passes through the locking portion 05d. Te head 013
a to the locking part 05d, and the holding metal fitting 014 is fitted into the tip male threaded part 013b protruding to the right side, and the peripheral edge of the holding metal fitting 014 is attached to the hub 010 of the rear wheel 010.
a, screw the nut 015 onto the threaded portion 013b exposed further to the right of the presser metal fitting 014, and securely fasten the rear wheel 010 to the rear axle 05.

[0008] Rear wheel 010 is rear axle 0
The hub 010a fixed to the hub 010a is located on the right side of the center line It is connected to the rim 010c that corresponds to XX.

Rotation is transmitted to the rear axle 05 via a chain spanned between a drive pulley of the engine (not shown) and a chain sprocket 08, and
The rear wheel 010, which is integrated with the rear wheel 010, is rotated.

0010

[Problem to be solved] Conventionally, the structure is as described above, so when removing the rear wheel, the axle bolts must be
13 Unscrew the nut 015 and remove the presser metal fitting 014.
It was necessary to remove the retainer, move the rear wheel 010 to the right, remove the boss 011 from the hole 010b, and then remove the rear wheel 010 to the rear.

The distance that the rear wheel 010 is moved to the right is the distance that the boss 011 moves to the flange 05c of the rear axle 05.
A minimum length d that protrudes further to the right is required (see FIG. 1), and a margin for this distance d must be secured on the right side of the rear wheel 010. In other words, when installing the muffler on the rear wheel 010 side, it is necessary to place the muffler outward by a distance d from the rear wheel 010, which causes problems such as a small bank angle and poor comfort. .

[0012] There is also a rear wheel support structure in which a stud bolt protrudes outward from the flange of the axle, the rear wheel is fitted into it, and a nut is screwed onto the stud bolt from the outside. When removing it, it is necessary to move the rear wheel by the length of the outward protrusion of the stud bolt, which causes the same problems as in the conventional example.

[0013] The present invention has been made in view of the above points.
The purpose of this is to provide a rear wheel support structure that does not require a space for attachment/detachment on the outside of the rear wheel, and allows the muffler to be attached to the rear wheel side without sacrificing bank angle or comfort. At the point.

[0014]

[Means and operations for solving the problems] In order to achieve the above object, the first invention provides a two-wheeled vehicle having a structure in which the rear swing arm supports the rear wheel in a cantilever manner. This rear wheel support structure for a two-wheeled vehicle has a fitting structure between the inner surface of the hub of the rear wheel that abuts the flange portion and which allows the rear wheel to be slidably attached and detached only in one direction perpendicular to the axle shaft.

The rear wheel can be attached to and detached from the rear axle by sliding in a direction perpendicular to the axle axis, and there is no need to move the rear wheel outward in the direction of the axle axis. There is no need to sacrifice bank angle or livability.

[0016] The second invention is a two-wheeled vehicle in which the rear swing arm supports the rear wheel in a cantilever manner, in which the axle holder portion of the rear swing arm is split in half so that it can be opened and closed, and the bearing holder is attached to the rear axle and the rear wheel. This is a rear wheel support structure for a two-wheeled vehicle that can be attached and detached along with the rear wheel in a direction perpendicular to an axle axis.

[0017] By opening one of the halves of the axle holder section, the rear wheel can be attached and detached in a direction perpendicular to the axle axis, so the muffler can be attached close to the rear wheel.

[0018] The third invention is a two-wheeled vehicle having a structure in which a rear swing arm supports a rear wheel in a cantilever manner, in which the rear end of the rear swing arm is branched into left and right branches, and a brake disc is installed between the left and right branch parts. This is a rear wheel support structure for a two-wheeled vehicle in which a rear wheel is provided on the outside of one of the branch parts.

Since the brake disc is disposed between the rear end branches of the rear swing arm, there is no need to offset the rear wheel outward to avoid the caliper that brakes the brake disc, and it is not necessary to dispose the rear wheel further outward. This allows the muffler to be positioned as close to the center of the vehicle body as possible, ensuring sufficient bank angle and comfort.

[0020]

Embodiment An embodiment of the first invention shown in FIGS. 2 to 5 will be described below. FIG. 2 is an overall side view of the motorcycle 1 of this embodiment, in which a main pipe 3 extends backward and slightly diagonally downward from a head pipe 2, and a bottom plate 4 is joined to both rear ends of the main pipe 3. It is bent and points downward. A pair of seat pipes 5 extend slightly diagonally upward toward the rear from the rear portions of the pair of left and right main pipes 3.

A rear swing arm 6 is swingably provided below the seat pipe 5 with its tip supported by a pivot 7 on the bottom plate 4, and a rear wheel 30 is pivotally supported at the rear end of the rear swing arm 6. has been done. A V-type engine 9 is suspended below the main pipe 3, and an exhaust pipe 10 extending from the engine 9 gathers in a chamber 11 in front of the rear wheel 30, and is inclined diagonally from the chamber 11 to the right side of the rear wheel 30. The muffler 12 is connected to a muffler 12 arranged at the

As shown in FIG. 3, the rear swing arm 6 has a tip 6a pivotally supported on the bottom plate 4 by a pivot 7, a central portion 6b that is largely curved to the left to avoid the rear wheel 30, and a rear end 6c. is located back toward the vehicle body center line XX side. An annular axle holder 20 is formed at the rear end 6c of the rear swing arm 6. A part of the rear of the annular ring is cut off so that it can be brought into and out of contact with the axle holder 20, and a coaxial A through hole 20b is formed, and a bolt is passed through the through hole 20b and fastened with a nut. A bearing holder 21 is fitted inside the annular ring of the axle holder 20, and the bearing holder 21 rotatably supports the rear axle 23 via a bearing 22 (see FIG. 4).

The bearing holder 21 extends slightly from the axle holder 20 toward the center line XX (right side), and a caliper support member 24 is fitted on the outer periphery of the extending cylindrical portion.
A caliper 25 is supported by the caliper support member 24. The rear axle 23 supported by the bearing holder 21 extends to the left side of the bearing holder 21, and a chain sprocket 2 is attached to the extending cylindrical portion 23a.
The cylindrical portion 23 is fitted with the sprocket support member 27 that supports the sprocket support member 6, and is exposed to the left side of the sprocket support member 27.
Attach the nut 2 through the washer 28 to the male thread formed on the
9 are screwed together, the sprocket support member 27 is fastened to the bearing 22, and the sprocket support member 27 is fixed integrally with the rear axle 23.

On the other hand, a flange 23b is formed on the right side of the vehicle body center line XX in a portion of the rear axle 23 that extends to the right from the bearing holder 21, and a flange 23b is formed on the right side of the flange 23b as shown in FIG. A rectangular guide portion 23c is provided in the. The guide portion 23c is formed by a rectangular shape that bulges out from the side surface of the flange 23b, which is shaped like a hollow disk.
d, and bolt holes 23e are bored on both sides thereof. Further, the flange 23b has bolt holes 23 on both sides of the guide portion 23c (upper and lower sides of the guide portion 23c in FIG. 5).
e is perforated.

The other rear wheel 30 has a central hub 30.
a has the same outer diameter as the outer diameter of the flange 23b, and a rectangular recess 30d is formed in the hub 30a corresponding to the rectangular guide portion 23c protruding from the flange 23b. The recessed portion 30d is formed by cutting out the thickness of the guide portion 23c over the entire diameter direction and having a width substantially equal to the short width of the guide portion 23c.

Therefore, as shown in FIG. 5, the rear axle 23 is rotated so that the guide portion 23c is horizontally elongated in the front and rear directions, and is placed on the same plane as the right side of the flange 23b at the same height behind the rear axle 23. rear wheel 30
When the rear wheel 30 is moved forward with the left side of the cylindrical portion 30a aligned and the recessed portion 30d in a longitudinally and laterally elongated posture, the right side of the flange 23b is aligned with the cylindrical portion 3 of the rear wheel 30.
A recessed portion 30d is in sliding contact with the left side surface of the guide portion 23c.
are mated. In this way, the rear wheel 3
0 forward, align the circular hole 30e drilled in the hub 30a of the rear wheel 30 with the bolt hole 23e provided in the flange 23b, and insert the bolt 31 from the outside into the bolt hole 23e. Then, the rear wheel 30 is fastened to the flange 23b of the rear axle 23.

When the rear wheel 30 is fastened, the central hub 30a of the rear wheel 30 is located on the right side of the vehicle center line XX, and the spokes 30 extending from the hub 30a
As b goes in the centrifugal direction, it curves inward to avoid the caliper 25, and its outer peripheral end is aligned with the vehicle center line X-X.
It is connected to a rim 30c that coincides with the rim 30c. Therefore V
Type engine 9 drive pulley and chain sprocket 26
Rear axle 23 via a chain spanned between
When the rear wheel 30 rotates, the rear wheel 30 rotates together with the rear axle 23.

The muffler 12 is disposed on the right side of the rear wheel 30 sufficiently close to it. As described above, the rear wheel 30 moves from the rear to the front and the guide portion 2
Since the muffler 12 is attached to the rear axle 23 by fitting the recess 30d into the muffler 3c and sliding it, the muffler 12 can be provided sufficiently close to the right side of the rear wheel 30 since no movement in the axle axis Y-Y direction is required.

Conversely, when removing the rear wheel 30,
After removing the bolt 31, it is sufficient to move the rear wheel 30 rearward so that the guide portion 23c is elongated longitudinally and horizontally, and there is no movement in the axle axis Y-Y direction, and the rear wheel 30 is moved close to the rear wheel 30. There is no problem in providing the muffler 12. Therefore, the muffler 12 does not protrude outward to a large extent, making it possible to secure a sufficiently large bank angle and maintain good comfort for the driver.

Next, an embodiment according to the second invention will be explained based on FIGS. 6 to 8.

A side view of the swing arm 40 according to this embodiment is shown in FIG. 6, and a plan view is shown in FIG. 7. The axle holder 41 having an annular shape at the rear end of the swing arm 40 is
It is divided into half along the Z-Z line in FIG. 6, and the upper member 42 of one of the divided parts is the swing arm 4
It is pivotally supported by a support shaft 44 located above the Z-Z line with respect to a lower member 43 that is integral with the main body, and can be opened by swinging upward. For the pivoting by the support shaft 44, the end of the lower member 43 is cut in the center to form a forked protrusion 43a, and the end 42a of the upper member 42 is narrowed to form a forked protrusion. It is fitted between the portions 43a and is supported by a support shaft 44 passing through both. In FIG. 6, a state in which the upper member 42 of the axle holder 41 is swung upward about the support shaft 44 and opened is shown by a two-dot chain line.

Open ends 42b and 43b of the upper member 42 and lower member 43 opposite to the pivot portions bulge slightly outward, and have coaxial through holes when both members 42 and 43 are closed. Then, the bolt 45 passes through both through holes and the nut 46
can be screwed together and tightened. A bearing holder 47 is fitted into the axle holder 41 tightened in this manner, and a rear axle 49 is rotatably supported by the bearing holder 47 via a bearing 48.

A sprocket support member 50 is fitted to the left protrusion 49a of the rear axle 49, a chain sprocket 51 is fixed to the sprocket support member 50, and a rear wheel 52 is attached to the protrusion 49b and flange 49c on the right side. The rear wheel 52 is fitted with a central hub 52a fitted into the protrusion 49b of the rear axle 49, and with the bottom surface of the hub 52a abutting against the flange 49c. At this time, bosses 53 are fixed at several locations on the flange 49c so as to protrude to the right side, and one rear wheel 52 is fixed to the flange 49c.
A hole 52 is bored in the cylindrical portion 52a of the cylindrical portion 52a corresponding to the boss 53.
A boss 53 is fitted into b. A brake disc 57 is fixed to the flange 49c of the rear axle 49 with bolts and nuts.

The rear axle 49 has a cylindrical shape and has a locking portion 49d with a reduced inner diameter formed at a predetermined position inside the rear axle 49, and an axle bolt 54 inserted into the rear axle 49 from the left side passes through the locking portion 49d. The head 54a is locked to the locking part 49d, and the tip male threaded part 54b protrudes to the right side.
Fit the holding fitting 55 into the rear axle 49 so that the peripheral edge of the holding fitting 55 presses the hub 52a of the rear wheel 52, and screw the nut 56 onto the threaded portion 54b exposed further to the right side of the holding fitting 55. wheel 52
We will firmly conclude this.

Since the rear wheel support structure of this embodiment is constructed as described above, the procedure for removing the rear wheel is to first remove the nut 56 that tightens the rear wheel 52 to the rear axle 49 from the axle bolt 54, and then remove the holding metal fitting. 55, remove the chain that spans the chain sprocket 51, then remove the bolts 45 and nuts 46 of the axle holder 41 into which the bearing holder 47 is fitted, swing the upper member 42 upwards to open it, and remove the bearing. If you move the holder 47 diagonally upward together with the rear axle 49 and rear wheel 52 to a position where the brake disc 57 does not interfere with the axle holder 41, and move the bearing holder 47 to the left together with the rear axle 49 while leaving the rear wheel 52 as it is, the brake disc 57 The rear axle 49 comes out of the hub 52a of the rear wheel 52 without interfering with the axle holder 41, and at the same time the boss 53 comes out of the hole 52b, and the rear wheel 52
can be taken out to the rear.

In this way, the rear wheel 52 can be removed rearward without moving in the axle axis Y-Y direction, and when reinstalling it, it can be done in the reverse order. Since movement in the axle axis Y-Y direction is not required, the muffler disposed on the right side of the rear wheel 52 can be close to the rear wheel 52.
The bank angle of the vehicle body and the comfort of the vehicle can be ensured sufficiently.

Next, an embodiment according to the third invention will be explained based on FIG. 9. The rear swing arm 60 of the same embodiment has an arm portion 60b that is offset to the left and extends rearward substantially straight from a pivot base 60a connected to the vehicle body frame, and the rear end of the arm portion 60b is bifurcated into two arms. Part 6
A left rear end portion 60c extending rearward along the left side surface of 0b and a right rear end portion 60d bent inward and extending rearward are opposed to each other with a space 61 formed therebetween. Bearing holders are formed at the left and right rear end portions 60c and 60d, and a rear axle 63 is rotatably supported via a bearing 62.

Space 6 between left and right rear end portions 60c and 60d
1, a chain sprocket 64 is fitted to the rear axle 63 near the left rear end 60c, and a brake disc 65 is fitted to the rear axle 63 near the right rear end 60d. A caliper 66 is fixed to the inside of the right rear end 60d, and the brake disc 6
It is designed to brake 5. Note that a cover 67 for preventing oil from adhering covers the outer periphery and left side of the brake disc 65.

In this manner, the brake disc 65, caliper 66, and chain sprocket 64 are compactly housed between the left and right rear ends 60c, 60d of the rear swing arm 60. A flange 6 is located near the rear end 60d of the protrusion 63a of the rear axle 63 that protrudes to the right from the right rear end 60d of the rear swing arm 60.
3b is formed to connect the central hub 68 of the rear wheel 68.
a is fitted into the protrusion 63a and abuts against the flange 63b, and is fastened by an axle bolt 69 passing through the inside of the rear axle 63 and a nut 70 via a presser fitting 71.

As described above, the brake disc 65, caliper 66 and chain 64 are attached to the rear swing arm 6.
Since the rear wheel 68 is compactly housed within the left and right rear ends 60c and 60d of the rear swing arm 60, the rear wheel 68, which is supported cantilevered on the right side of the rear swing arm 60, needs to be offset to the right to avoid the caliper. Since there is no offset and the muffler disposed on the right side of the rear wheel 68 can also be disposed closer to the center, it is possible to ensure a sufficient bank angle and comfort.

In the above embodiment, even if the muffler disposed on the right side of the rear wheel is close to the rear wheel, the rear wheel can be easily removed, and the bank angle and comfort can be secured. In the combination of a V-type engine and a cantilevered rear swing arm, a chamber 11 is present as shown in FIG. 2, and a connecting portion 13 connected to the muffler is connected to the chamber 11 via a joint 14. Therefore, even if the muffler is rotated, the torsional load can be supported by the chamber 11 and the surrounding supporting members, so that the rotation of the muffler will not cause any trouble in moving the rear wheel in the axle axis direction and removing it. can do.

However, as shown in FIG. 10, in the combination of a parallel multi-cylinder engine and a cantilevered rear swing arm, providing such a joint requires supporting members and a special structure, and it is difficult to rotate the muffler. It will cost money to make it work. That is, in FIG. 10, the exhaust pipe 81 first extends forward from the parallel multi-cylinder engine 80, bends downward, extends rearward below the engine 80, and further extends to the right side of the rear wheel 84 cantilevered by the rear swing arm 83. However, when the muffler 82 is located on the right side of the rear wheel 84 as shown by the broken line, rotating the rear wheel 84 and removing the rear wheel 84 takes away the torsional load as described above. This requires a special supporting structure, which increases costs.

[0043] Therefore, it is conceivable to arrange the muffler 82 away from the rear wheel 84 or on the left side of the vehicle body, but this may make it impossible to obtain a sufficient bank angle or cause the lateral balance to be lost. It turns out. Therefore, by arranging the muffler 82 on the right side of the vehicle above the rear wheel 84 as shown by the solid line, it is possible to secure a sufficient bank angle and maintain the left-right balance.Also, the rear wheel 84 can be removed by rotating the muffler 82. Or it can be easily done without removing it.

[0044]

[Effects of the Invention] The first invention is that the rear wheel is slidably fitted to the rear axle in a direction perpendicular to the axle axis, and the second invention is that the axle holder is divided and the rear wheel is fitted together with the bearing holder. By making it removable in a direction perpendicular to the axle axis, the rear wheel can be removed rearward without moving in the direction of the axle axis, making it possible to place the muffler close to the rear wheel and adjusting the bank angle and Sufficient livability can be ensured.

Furthermore, in the third aspect of the invention, since the brake disc is disposed between the rear end branches of the rear swing arm, there is no need to dispose the rear wheel outwardly to avoid the caliper that brakes the brake disc. The muffler, which is disposed outward from the rear wheels, can be positioned as close to the center of the vehicle body as possible, ensuring sufficient bank angle and comfort.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a conventional rear wheel support structure.

FIG. 2 is a partial side sectional view of an embodiment of a motorcycle according to the first invention.

FIG. 3 is a plan view of the same.

FIG. 4 is a cross-sectional view of the same main part.

FIG. 5 is an exploded perspective view of the same essential parts.

FIG. 6 is a side view of the rear swing arm of an embodiment according to the second invention.

FIG. 7 is a plan view of the same.

FIG. 8 is a cross-sectional view showing the rear wheel support structure.

FIG. 9 is a cross-sectional view showing a rear wheel support structure according to an embodiment of the present invention.

FIG. 10 is a partial side view of a motorcycle according to another embodiment.

[Explanation of symbols]

1...Motorcycle, 2...Head pipe, 3...Main pipe, 4...Bottom plate, 5...Seat pipe, 6...Rear swing arm, 7...Pivot, 9...V-type engine, 10
...Exhaust pipe, 11...Chamber, 12...Muffler, 20...
Axle holder, 21...Bearing holder, 22...
Bearing, 23... Rear axle, 24... Caliper support member, 25... Caliper, 26... Chain sprocket, 27... Sprocket support member, 30... Rear wheel, 31... Bolt, 40... Swing arm, 41... Axle holder, 42... Upper member , 43...lower member, 44...
Support shaft, 45... Bolt, 46... Nut, 47... Bearing holder, 48... Bearing, 49... Rear axle, 5
0... Sprocket support member, 51... Chain sprocket, 52... Rear wheel, 53... Boss, 54... Axle bolt, 55... Holding metal fitting, 56... Nut, 57... Brake disc, 60... Rear swing arm, 61... Space,
62... Bearing, 63... Rear axle, 64... Chain sprocket, 65... Brake disc, 66... Caliper, 67... Cover, 68... Rear wheel, 69... Axle bolt, 80... Parallel multi-cylinder engine, 81... Exhaust pipe, 82... Muffler, 83...Rear swing arm, 84
...Rear wheel.

Claims (3)

[Claims] 1. In a two-wheeled vehicle having a structure in which a rear swing arm supports a rear wheel on a cantilever, the rear wheel is located between an outer surface of a flange portion of a rear axle and an inner surface of a hub of the rear wheel that abuts the flange portion. A rear wheel support structure for a two-wheeled vehicle, comprising a fitting structure that can be slidably attached and detached only in one direction perpendicular to an axle shaft. 2. In a two-wheeled vehicle having a structure in which a rear swing arm supports a rear wheel in a cantilever manner, an axle holder portion of the rear swing arm is split in half and can be opened and closed, and the bearing holder is attached to the axle together with the rear axle and the rear wheel. A rear wheel support structure for a two-wheeled vehicle characterized by being able to be attached and detached in a direction perpendicular to the axis. 3. In a two-wheeled vehicle having a structure in which a rear swing arm supports a rear wheel on a cantilever, the rear end of the rear swing arm is bifurcated into left and right branches, a brake disc is disposed between the left and right branch parts, and one A rear wheel support structure for a two-wheeled vehicle, characterized in that a rear wheel is provided on the outside of a branching part.