JP2002087364A - Motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure rigidity of a rear arm, and compact a body. SOLUTION: In this motorcycle wherein the rear arm 14 is pivoted to a body frame 1, wherein the rear arm 14 is supported by a rear wheel suspension device 21, and wherein a rear wheel 15 supported by the rear arm 14 is driven by a shaft driving mechanism, the rear arm 14 is integrally formed with left and right arm parts 14a, 14b extended to the rear wheel side, and a head part 14c for connecting the arm part 14a, 14b to be pivoted to the body frame 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle having a shaft drive mechanism.

[0002]

2. Description of the Related Art Some motorcycles pivotally support a rear arm on a body frame, support the rear arm by a rear wheel suspension device, and drive a rear wheel supported by the rear arm by a shaft drive mechanism.

[0003]

When the rear wheels are driven by such a shaft drive mechanism, the drive shaft of the shaft drive mechanism is disposed inside the rear arm, so that the head portion of the rear arm is divided to secure rigidity. Was difficult.

Further, there is another problem that the head of the rear arm is outside the drive shaft and the rider's feet are widened accordingly.

The present invention has been made in view of such circumstances, and has as its object to provide a motorcycle in which the rigidity of the rear arm is ensured and which is compact.

[0006]

Means for Solving the Problems In order to solve the above problems and achieve the object, the present invention has the following constitution.

According to the first aspect of the invention, there is provided a motorcycle in which a rear arm is pivotally supported on a vehicle body frame, the rear arm is supported by a rear wheel suspension device, and a rear wheel supported by the rear arm is driven by a shaft drive mechanism. , The rear arm extends to the rear wheel side and includes a shaft drive mechanism therein, and a second arm constituting an opposite side of the first arm portion with respect to the rear wheel suspension device. Part and a head part which connects the first and second arm parts and is pivotally supported by the body frame are integrally formed.
Motorcycle characterized in that it is connected to the frame side by a pivot shaft. ].

According to the first aspect of the present invention, since the first and second arms are connected and integrated with the head portion pivotally supported by the vehicle body frame, the rigidity of the rear arm is ensured, and the rear arm is compact. is there.

According to a second aspect of the present invention, a frame member is arranged inside the shaft drive mechanism, and a pivot shaft is provided between the frame member and an opposite frame member. The motorcycle according to claim 1, wherein a head portion of the rear arm is pivotally supported. ].

According to the second aspect of the present invention, a frame member is disposed inside the shaft drive mechanism, and a pivot shaft is provided between the frame member and the opposite frame member to provide a head portion of the rear arm. And the frame width does not increase because the frame member does not come out of the shaft drive mechanism.

According to a third aspect of the invention, there is provided the motorcycle according to the second aspect, wherein the pivot shaft is detachable from a side opposite to the shaft drive mechanism. ].

According to the third aspect of the present invention, the pivot shaft can be easily attached and detached from the side opposite to the shaft drive mechanism.

According to a fourth aspect of the present invention, there is provided an apparatus according to the first aspect, wherein a decorative cover for covering the shaft drive mechanism is detachably provided on the rear arm.
The motorcycle according to any one of the preceding claims. ].

[0014] According to the fourth aspect of the present invention, the decorative cover detachably provided on the rear arm makes the shaft drive mechanism invisible from the outside, thereby improving the appearance.

According to a fifth aspect of the present invention, the footrest bracket on the shaft drive mechanism side is detachable from the vehicle body frame, and when removed, the universal joint portion of the shaft drive mechanism can be exposed to the side of the vehicle. The motorcycle according to any one of claims 1 to 4, wherein: ].

According to the fifth aspect of the present invention, when the footrest bracket is detached, the universal joint portion of the shaft drive mechanism can be exposed to the side of the vehicle. Work is easy.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A motorcycle according to an embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is a side view of a motorcycle, FIG. 2 is a side view showing a state where an engine is supported on a body frame, FIG. 3 is a side view of a pivot portion of a rear arm, FIG. 4 is a rear view of a pivot portion of a rear arm, 5 is a view showing a shaft drive mechanism, FIG. 6 is a right side view of a rear wheel support portion of a rear arm, FIG. 7 is a side view of the rear arm, FIG. 8 is a plan view of the rear arm, and FIG. 9 is a side view of a footrest bracket. 10 is a plan view of a footrest bracket, FIG. 11 is a view showing a decorative cover, FIG.
2 is a side view of the disc brake device, and FIG.
It is sectional drawing which follows the XIII-XIII line.

A front fork 4 on which a front wheel 3 is suspended is rotatably supported on a head pipe 2 constituting a body frame 1 of the motorcycle, and can be steered by a bar handle 5. A pair of left and right main frames 6 extending rearward is welded to the rear side of the head pipe 2, and a rear arm bracket 7 is welded to the rear portion of the main frame 6.

The rear arm bracket 7 is shown in FIGS.
As shown in FIG. 5, the front end has an opening 7a in the front-rear direction and a concave portion 7b which is open on the side.
f is formed. A stay mounting portion 7g is formed on both left and right sides of the upper connecting portion 7c, and a shock absorber mounting portion 7h is formed in the center. A link attachment portion 7i is formed in the lower connection portion 7d.

The rear side of the back stay 9 extending rearward is mounted on the stay mounting portion 7g. Seat frames 8 are welded to the rear ends of the pair of left and right main frames 6, respectively, and the rear side of the seat frames 8 is welded to the rear side of the back stay 9.

A seat 90 is mounted on the seat frame 8, and a fuel tank 91 is mounted on the main frame 6 in front of the seat 90. A pair of left and right down tubes 12 is connected to the rear side of the head pipe 2. The engine 26 is mounted on the main frame 6 and the rear arm bracket 7.

The frame part 7 of the rear arm bracket 7
e and 7f constitute a frame member.
The pivot shaft 10 is inserted into the e and 7f from the right side, and the screw portion 10a at the tip of the pivot shaft 10 is screwed to the frame portion 7e. A nut 11 is screwed into a screw portion 10b on the head of the pivot shaft 10, and the pivot shaft 10 is connected to the frame portions 7e and 7f.
Attached to.

A rear arm 14 is pivotally supported on the pivot shaft 10, and the rear arm 14 includes left and right arm portions 14a and 14b (first and second arm portions) extending to the rear wheel side as shown in FIGS. And the left and right arm portions 14a,
The head portion 14c which is connected to the rear arm 14 and is pivotally supported by the rear arm bracket 7 is integrally formed, so that the rigidity of the rear arm 14 is ensured, and the rear arm 14 is compact.

The head portion 14c has a pivot shaft insertion hole 1
4d are formed, and the shock absorber insertion opening 14 is formed.
e is formed. On the lower side of the center of the head portion 14c,
A link mounting portion 14f is formed, a tension member mounting portion 14g is formed on the upper right side, and a screw boss portion 14h is formed on the left side portion.

The arm portion 14a is shorter than the arm portion 14b, and is positioned from the left side of the head portion 14c.
a, a drive shaft insertion hole 14i is formed, and a gear box mounting portion 14 is formed at the rear end of the arm portion 14a.
j is formed. An axle mounting hole 14k is formed at the rear end of the arm 14b.

The pivot shaft insertion hole 14d of the rear arm 14
The rear arm 14 is pivotally supported between the left and right arm portions 14a and 14b, and the rear arm 14 is supported by a link 22 of a rear wheel suspension device 21. The link 22 is an L-shaped relay arm 22 in side view.
a and a pair of left and right arms 22b. The relay arm 22a is pivotally supported on the frame side via a support shaft 80, and has an end 22 opposite to the pivotal support 22a1.
a2 is rotatably connected to the lower end 28a of the shock absorber 28 via a support shaft 81. An upper end portion 28b of the shock absorber 28 is connected to a shock absorber mounting portion 7h of the rear arm bracket 7, and the shock absorber 28 is disposed so as to pass through the shock absorber insertion opening 14e of the rear arm 14.

The pair of left and right arms 22b connects the intermediate point 22a3 of the relay arm 22a and the link mounting portion 14f of the rear arm 14. The intermediate point 22a3 is rotatably connected via a support shaft 82, and is rotatably connected to the link mounting portion 14f via a support shaft 83.

In this motorcycle, a rear wheel 15 supported by a rear arm 14 is driven by a shaft drive mechanism 40. The output shaft 41 of the engine 26 is connected to a drive shaft 43 via a universal joint 42, and the drive shaft 43 is disposed in the drive shaft insertion hole 14i.

The drive shaft 43 is connected to the gearbox 4
4 and is connected to a bevel gear 45 disposed at the center position. The gear box 44 is attached to the gear box attachment portion 14j, and the axle attachment hole 44a of the gear box 44 and the arm 1
An axle 46 is mounted between the axle mounting hole 14k and the axle 46b.

The rear axle 15 of the rear wheel 15 is mounted on the axle 46.
a is provided rotatably, and a bevel gear 47 is provided on the rear axle 15a so as to be integrally rotatable. The bevel gear 47 is meshed with the bevel gear 45, and power from the drive shaft 43 is transmitted to the rear axle 15a via the bevel gear 45 and the bevel gear 47.

The motorcycle has a rear brake device 5
0, and the rear brake device 50
As shown in FIG. 13, a disc brake device is used.

The brake disk 51 of the rear brake device 50 is fixed to the side opposite to the bevel gear 47 side and can rotate integrally. A bracket 52 of the rear brake device 50 is provided so as to be pivotally supported on the axle 46.
2, a caliper 54 is movably supported by a pair of slide pins 60, and the caliper 54 is
1 straddles the outer circumference.

A piston 62 is slidably provided in the cylinder 61 of the caliper 54, and the piston 62 moves toward the brake disk 51 by the pressure of the brake fluid supplied to the brake fluid chamber 63. The pads 55 and 56 disposed inside the caliper 54
When the friction pad 55 is in sliding contact with the braking surface of the brake disc 51 by the piston 62, the caliper 54 moves due to the reaction force of the friction pad 55 and the pad 56
Is brought into sliding contact with the braking surface on the opposite side of the brake disk 51 to apply braking.

A tension member mounting portion 52a is formed on the bracket 52 of the rear brake device 50, and the end of the tension member 53 is fastened and fixed to the tension member mounting portion 52a by a bolt 88. The portion is connected to the tension member mounting portion 14g by tightening and fixing with a bolt 89.

A brake hose 57 is connected to the caliper 54, and brake fluid is supplied to the caliper 54 from the brake hose 57. The brake hose 57 is held by the tension member 53 by the holder 58, and the brake hose 57 and the tension member 53 swing together, so that the brake hose 57 is not damaged.

The caliper 54 of the rear brake device 50 is disposed below the rear arm 14 and
3 is arranged so as to cross the inside of the rear arm 14 as shown in FIG. Thus, by setting the mounting angle of the caliper 54 to the front side, the tension member 53 can be easily taken out tangentially to the outer periphery of the brake disc 51, and the tension member 53 can be mounted to the rear arm 14 at the shortest distance. Tension member 53
Compact and lightweight.

Further, since the offset of the tension member 53 from the surface of the brake disk 51 can be reduced, the strength of the mounting portion of the tension member 53 and the uneven wear of the pads 55 and 56 are advantageous, and the drag of the rear wheel 15 and the brake Squeak can be prevented.

The line L1 connecting the axle axis O1 of the rear wheel 15 and the braking center O2 of the caliper 54 extends from the ground line L.
The tension member 53 is disposed on the tangent line L4 of the intersection O3 between the extension of the connecting line L1 and the outer periphery of the brake disk 51 and the caliper 54 at the time of braking. To bracket 5
2 can be received by the tension member 53 arranged along the tangent line L4, and the bending in the rotation direction can be reduced by the tension member 53, the tension member mounting portion 52a, and the tension member mounting portion 14g.
The strength of the mounting portion of the tension member 53 is improved.

The universal joint 42 of the shaft drive mechanism 40 is
The recess 7b is covered with a footrest bracket 70 attached to the rear arm bracket 7, as shown in FIGS. As shown in FIGS. 9 and 10, the footrest bracket 70 has a pair of mounting holes 70 a in an upper part and a pair of mounting holes 70 b in a lower part, and further includes a cover part 70 c and a footrest mounting part 70.
d.

The footrest bracket 70 has a mounting hole 7
0a is fastened and fixed to the upper mounting portion 7p of the rear arm bracket 7 with screws 75, and the mounting hole 70b is tightened and fixed to the lower mounting portion 7q of the rear arm bracket 7 with screws 76, and mounted to the rear arm bracket 7.

The cover 7 of the footrest bracket 70
0c prevents the rider's foot from interfering with the shaft drive mechanism 40 or the like inside the vehicle body. A footrest 71 is mounted on the footrest mounting portion 70d.

The rear arm 14 is provided with a removable cover 72 for covering the shaft drive mechanism 40. As shown in FIG.
It has two screw insertion holes 72a and positioning recesses 72b,
Further, a live shaft escape recess 72c is provided.

When the footrest bracket 70 is removed, the universal joint portion 42 of the shaft drive mechanism 40 can be exposed to the side of the vehicle, so that the work of connecting the universal joint portion 42 is easy at the time of assembly.

In the decorative cover 72, the live shaft escape concave portion 72c is fitted into the drive shaft 43, the positioning concave portion 72b is engaged with the positioning rib 141 of the rear arm 14 and positioned, and the screw 73 is inserted into the screw insertion hole 72a to thereby make the screw boss. Tighten it to the part 14h. Rear arm 14
The shaft drive mechanism 40 is made invisible from the outside by the decorative cover 72 which is detachably provided on the vehicle, and the appearance is improved.

Further, a frame portion 7e constituting a frame member is disposed inside the universal joint portion 42 of the shaft drive mechanism 40, and a pivot is provided between the frame member and a frame portion 7f constituting an opposite frame member. A shaft 10 is provided and a head portion 14c of the rear arm 14 is provided.
, And the frame width is not increased because the frame portion 7e does not protrude outside the universal joint portion 42, so that the vehicle becomes compact. Further, the pivot shaft 10 can be easily attached and detached by tightening or removing the nut 11 from the side opposite to the universal joint portion 42 of the shaft drive mechanism 40.

As the rear arm 14 of the above embodiment,
Although the rear wheel is described as being supported by the two left and right arms 14a and 14b, the present invention relates to a shaft drive mechanism 4
A cantilevered rear arm that is supported only by the first arm portion 14a that contains 0 may be used.

[0048]

As described above, in the first aspect of the present invention, the first and second arms are connected and integrated with the head that is pivotally supported by the body frame, so that the rigidity of the rear arm is ensured. And it is compact.

According to the second aspect of the present invention, the frame member is disposed inside the shaft drive mechanism, and a pivot shaft is provided between the frame member and the opposite frame member to pivotally support the head portion of the rear arm. However, since the frame member does not protrude outside the shaft drive mechanism, the vehicle width is not widened and the vehicle is compact.

According to the third aspect of the present invention, the pivot shaft can be easily attached and detached from the side opposite to the shaft drive mechanism.

According to the fourth aspect of the present invention, the decorative cover detachably provided on the rear arm makes the shaft drive mechanism invisible from the outside, thereby improving the appearance.

According to the fifth aspect of the present invention, when the footrest bracket is removed, the universal joint of the shaft drive mechanism can be exposed to the side of the vehicle.
At the time of assembly, the connection work of the universal joint is easy.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle.

FIG. 2 is a side view showing a state in which an engine is supported on a vehicle body frame.

FIG. 3 is a side view of a pivot portion of the rear arm.

FIG. 4 is a rear view of a pivot portion of the rear arm.

FIG. 5 is a view showing a shaft drive mechanism.

FIG. 6 is a right side view of a rear wheel supporting portion of the rear arm.

FIG. 7 is a side view of a rear arm.

FIG. 8 is a plan view of a rear arm.

FIG. 9 is a side view of the footrest bracket.

FIG. 10 is a plan view of a footrest bracket.

FIG. 11 is a view showing a decorative cover.

FIG. 12 is a side view of the disc brake device.

FIG. 13 is a sectional view taken along the line XIII-XIII of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body frame 2 Head pipe 14 Rear arm 14a, 14b 1st, 2nd arm part 14c Head part 15 Rear wheel 21 Rear wheel suspension device 40 Shaft drive mechanism

Claims (5)

[Claims] 1. A motorcycle in which a rear arm is pivotally supported on a vehicle body frame, the rear arm is supported by a rear wheel suspension device, and a rear wheel supported by the rear arm is driven by a shaft drive mechanism. A first arm portion extending to the side and including a shaft drive mechanism therein; a second arm portion forming the opposite side of the first arm portion across the rear wheel suspension device; A motorcycle characterized in that a two-arm part is connected to form a head part pivotally supported by a vehicle body frame, and the head part is connected to the frame by one pivot shaft. 2. A frame member is arranged inside the shaft drive mechanism, and a pivot shaft is provided between the frame member and an opposite frame member, and the pivot shaft pivotally supports a head portion of the rear arm. The motorcycle according to claim 1, wherein: 3. The motorcycle according to claim 2, wherein the pivot shaft is detachable from a side opposite to the shaft drive mechanism. 4. The motorcycle according to claim 1, wherein a decorative cover for covering the shaft drive mechanism is detachably provided on the rear arm. 5. The footrest bracket on the shaft drive mechanism side is detachable from the vehicle body frame, and when removed, the universal joint portion of the shaft drive mechanism can be exposed to the side of the vehicle. The motorcycle according to any one of claims 1 to 4.