JP2000062671A - Rear fender attaching structure of motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain deviation of centers in the width direction, between a rear fender and a rear wheel by improving attaching accuracy of the rear fender, to improve attaching strength of the rear frame, and to reduce cost. SOLUTION: In this rear fender attaching structure of a motorcycle, a rear frame 18 is attached to the rear end of a pair of right and left main frames 8 extending from a head pipe to the rear part of a vehicle, and the rear fender 29 is attached to the rear frame 18. The rear frame 18 is arranged in the rear fender 29 and integrated with the main frame 8 by welding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear fender mounting structure for a motorcycle.

[0002]

2. Description of the Related Art A rear fender that covers a rear wheel of a motorcycle is attached to a pair of left and right main frames via a rear frame. That is, a rear frame is attached to the rear end portions of a pair of left and right main frames extending from the head pipe to the rear of the vehicle body, and a rear fender is attached to the rear frame.

[0003]

However, conventionally, the rear frame extends from the head pipe to the rear of the vehicle body and is attached to the pair of left and right main frames exposed outward in the vicinity of the lower part of the seat by bolts. Therefore, there is a problem in that the mounting accuracy cannot be kept high, and there is a large misalignment in the width direction between the rear fender mounted on the rear frame and the rear wheel.

Further, conventionally, since the rear frame is located outside the rear fender in the width direction to form the external parts,
There is also a problem in that the cost of the rear frame is increased due to the improvement in appearance quality.

The present invention has been made in view of the above problems, and an object of the present invention is to improve the mounting accuracy of the rear fender to suppress the misalignment between the rear fender and the rear wheel in the width direction and to reduce the rear frame. An object of the present invention is to provide a rear fender mounting structure for a motorcycle, which can improve the mounting strength and reduce the cost.

[0006]

In order to achieve the above object, the invention according to claim 1 includes a pair of left and right main frames which extend from the head pipe to the rear of the vehicle body and are exposed outward in the vicinity of the lower portion of the seat. In a rear fender mounting structure for a motorcycle, in which a rear frame is attached to a rear end portion and a rear fender is attached to the rear frame,
The rear frame is disposed inside the rear fender and is integrally welded to the main pipe.

According to a second aspect of the invention, in the first aspect of the invention, the rear frame is welded and integrated with the main pipe via a bracket which is a forged component.

According to a third aspect of the present invention, in the second aspect of the present invention, the bracket includes a side surface and an upper surface that extend upward from the main frame and then bend inward in the vehicle width direction. A three-dimensional vehicle width surface having a front surface formed so as to connect the front portions is formed.

Therefore, according to the first aspect of the invention, since the rear frame is integrally welded to the left and right main frames, the rear frame is fixed to the main frame with the conventional bolts. Therefore, the mounting accuracy of the rear fender mounted on the rear frame is also improved, the misalignment in the width direction between the rear fender and the rear wheels is suppressed, and the rear frame is mounted. Strength is also increased. or,
The rear frame is arranged in the rear fender, and since the entire rear frame is covered by the rear fender, the rear frame does not form an external component, and therefore the rear frame needs to be processed to enhance its external appearance. Therefore, the cost of the rear frame can be reduced.

According to the second aspect of the present invention, since the rear frame is welded and integrated with the main pipe via the bracket which is a forged component, the mounting strength and the mounting accuracy of the rear frame are further enhanced.

According to the third aspect of the present invention, since the three-dimensional surface is formed on the bracket, higher rigidity can be secured for the bracket while avoiding interference with the rear arm.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of the motorcycle, and FIG. 2 is a side view of a body frame of the motorcycle.

In the motorcycle 1 shown in FIG. 1, reference numeral 2 is a head pipe located in the upper front part of the vehicle body, and a steering shaft (not shown) is rotatably inserted in the head pipe 2. An upper end of a front fork 5 is supported on the steering shaft via a top bridge 3 and a bottom bridge 4, and a front wheel 6 is rotatably supported on the lower end of the front fork 5. A handle 7 is attached to the top bridge 3.

A main frame 8 and a down tube 9 extend from the head pipe 2 toward the rear of the vehicle body, and these constitute a vehicle body frame 10.

Here, details of the structure of the vehicle body frame 10 will be described with reference to FIG.

As shown in FIG. 2, a pair of left and right main frames 8 extend obliquely downward toward the rear of the vehicle from the head pipe 2 in a side view, and a pair of left and right down tubes 9 in a side view. After extending obliquely downward toward the rear of the vehicle body, it is bent toward the rear of the vehicle body and extends below the main frame 8 substantially horizontally toward the rear of the vehicle body.

The rear ends of the main frame 8 and the down tube 9 on the same side are connected to each other by a pair of left and right rear end tubes 11 having an arc shape. A closed loop including the head pipe 2, the main frames 8, the down tubes 9 and the rear tubes 11 is independently provided on the left and right sides.

By the way, in the body frame 10,
A rear arm bracket 12 is erected substantially vertically at a front position of the rear end tube 11, an upper end of the rear arm bracket 12 is connected to the main frame 8, and a lower end is installed between left and right down tubes 9. It is bound to the upper surface of a square pipe-shaped cross pipe 13.

A rear arm 27 (see FIG. 1), which will be described later, is provided at an intermediate height position of the rear arm bracket 12.
A pivot pipe 14 pivotally supporting the front end of the rear pipe is pierced laterally, and cushion brackets 15 and 16 are attached to the rear surface of the rear arm bracket 12 so as to be distributed above and below the pivot pipe 14. There is.

Here, in FIG. 2, 17 is a reinforcing pipe, 18 is a rear frame attached to the rear ends of the left and right main frames 8, and 3 is provided between both rear frames 18.
One cross member 19 is installed.

As shown in FIG. 1, a V-type two-cylinder engine 20 is housed and supported in the closed loop of the vehicle body frame 10 having the above-described structure, and exhaust from the cylinders 20a and 20b in front of and behind the engine 20. The tubes 21 and 22 extend rearward on the right side (the back side in FIG. 1) of the vehicle body, and the carburetor 23 is disposed between the cylinders 20a and 20b.

A fuel tank 24 is supported on the main frame 8 above the engine 20, and a main seat 25 and a tandem seat 26 are provided behind the fuel tank 24.
Are arranged at the front and rear.

On the other hand, a front end of a rear arm 27 is pivotally attached to the pivot pipe 14 provided on the rear arm bracket 12 so as to be swingable, and a rear wheel 28 is rotatably attached to a rear end of the rear arm 27. It is pivotally supported. The upper half of the rear wheel 28 is covered with a rear fender 29, and the tandem seat 26 is installed on the rear fender 29. The rear arm 27 and the rear wheel 28 pivotally supported on the rear end of the rear arm 27 are suspended on the vehicle body side by a single rear cushion 30 (see FIG. 6) arranged between the rear arm bracket 12 and the rear wheel 28. ing.

Thus, the motorcycle 1 according to the present embodiment.
Adopts a shaft drive type as a drive system,
An output shaft (not shown) of the engine 20 is connected to a drive shaft 31 (see FIG. 1) via a universal joint (not shown).

The drive shaft 31 extends substantially horizontally toward the rear on the left side (hand side in FIG. 1) of the vehicle body, and its rear end is connected to a gear mechanism (not shown) housed in a rear gear case 32. Has been done. The rear gear case 32 is supported by one (left) rear arm end 33 of the rear arm 27.

The rotation of the engine 20 is controlled by the output shaft (not shown), the universal joint, and the drive shaft 31.
Also, it is transmitted to a rear wheel 28 via a gear mechanism (not shown), the rear wheel 28 is rotationally driven, and the motorcycle 1 is caused to travel at a predetermined speed. Further, when the rear wheel 28 and the rear arm 27 swing up and down due to the ups and downs of the road surface while the motorcycle 1 is running, the rear cushion 3 is accordingly moved.
0 expands and contracts to generate a damping force, and the damping force absorbs and relaxes the shock that the rear wheel 28 receives from the road surface.

The mounting structure of the rear fender 29, which constitutes the subject matter of the present invention, will be described with reference to FIGS. 3 is a partial plan view showing the rear fender mounting structure according to the present invention, FIG. 4 is a partial side view of the same, and FIG. 5 is a sectional view taken along line AA of FIG.

As shown in FIG. 3, a cross pipe 34 is laid horizontally between the rear ends of the pair of left and right main frames 8, and the inner outer peripheral surface of each main frame 8 at the rear of the cross pipe 34. Brackets 35, which are forged parts, are joined and integrated by welding.

As shown in FIG. 5, each of the brackets 35 is located on the inner side of the main frame 8 in the vehicle width direction so that the bracket 35 is prevented from interfering with the upper arm 27a of the rear arm 27 that swings up and down. Vertical part that rises substantially vertically ("side face" in the claims) 3
5a and the inner side in the vehicle width direction from the upper end of the vertical portion 35a (see FIG.
(A right side of), an inclined surface (“upper surface” in the claims) 35b inclined obliquely upward, and the inclined portion 35
It has an insertion portion 35c that rises substantially vertically from the inner end of b. As shown in FIG. 4, the vertical portion 35a of the bracket 35 has two surfaces (that is, "front surface" in the claims) that form a predetermined angle with each other (that is, are not located on the same plane) a, b, and the surfaces a and b and the slope c of the inclined portion 35b form a three-dimensional surface with each other, and since the bracket 35 has high strength and rigidity because it is a forged part, the rigidity of the bracket 35 is different from that of the upper arm 27a. It is further enhanced by the three-dimensional surfaces ac while avoiding interference.

Then, the insertion portion 35 of the bracket 35
One end of the rear frame 18 is inserted into c and integrated by welding. The rear frame 18 is composed of a channel-shaped member having a U-shaped cross section. As shown in FIG. 4, the rear frame 18 rises obliquely upward in the side view from the joint to the bracket 35 and then extends rearward. And extends substantially horizontally, and a pair of left and right rear frames 18
As described above, the three cross members 19 are horizontally provided between them.

The pair of left and right rear frames 18
The rear fender 29 is covered on the cross member 19 which is laid across these, and the rear fender 29 is attached and supported by the left and right rear frames 18 and the cross member 19. That is, as shown in FIG. 5, the rear frame 18 is arranged inside the rear fender 29, and the entire rear frame 18 is covered with the rear fender 29 as shown in FIG. 4, so that the rear frame 18 does not constitute an external component. Therefore, the rear frame 18 does not need to be processed to enhance its appearance, and the cost of the rear frame 18 can be reduced.

Further, since the left and right rear frames 18 are welded and integrated with the left and right main frames 8 via the bracket 35 which is a forged component, the rear frames 18 are mounted on the main frame 8 with a precision of the conventional bolt. However, the accuracy of mounting the rear fender 29 mounted on the rear frame 18 is also improved, and the misalignment in the width direction between the rear fender 29 and the rear wheel 28 is small. In addition to being suppressed, the mounting strength of the rear frame 18 is also enhanced.

Further, the left and right rear frames 18 are connected to each other via the bracket 35 which is a forged part.
Since the rear frame 18 is attached to the rear frame 18 by welding, the weight of the occupant loaded on the tandem seat 26 is increased by the cross member 19.
You can definitely receive it.

Here, the structure for the initial adjustment of the rear cushion 30 will be described with reference to FIGS. 6 is a partial side view around the rear cushion of the motorcycle, FIG. 7 is a partial plan view of the rear fender, FIG. 8 is a perspective view of the cover, FIG. 9 is a perspective view of the lid, and FIG. 10 is an initial adjustment of the rear cushion. It is a side view which shows the point.

As shown in FIG. 6, the rear cushion 3
The upper end of 0 is attached to the rear arm bracket 12 through the cushion bracket 15, and the lower end of the rear cushion 30 is supported by the rear arm bracket 12 and the rear arm 27 through a link mechanism (not shown).

By the way, the initial load of the cushion spring 30a of the rear cushion 30 is adjusted by the tool 36 shown in FIG. 10, but this initial load adjustment can be performed without removing the rear fender 29. In the form, the following structure was adopted.

That is, as shown in FIG. 7, the rear fender 2
A notch portion 29a is formed at the front end portion of 9, and the notch portion 29a is covered with a removable cover 37 as shown in FIG. Further, the opening formed between the main frames 8 above the rear cushion 30 is covered with the detachable lid 38.

By the way, the cover 37 is made of resin as shown in FIG.
6 is integrally formed with a resin rivet 39 (see FIG. 6) which is inserted through a circular hole 37a formed at the top of the resin rivet 39 (FIG. 6).
(See FIG. 6) and a plurality of circular holes 37b (see FIG. 8) formed on the left and right sides, and is detachably attached to the rear fender 29 by a resin rivet 40 (see FIG. 6). Notch 29a
Are covered.

Further, the lid 38 is integrally molded with resin in a shape as shown in FIG. 9, and this is mounted on the bracket shown in FIG. 6 by a resin rivet 41 which is inserted into an elongated hole 38a formed at the center of the front end thereof. 42, and the other end is overlapped on the front end of the cover 37 as shown in FIG. 6, and the cover 37 and the lid 38 are formed with circular holes 37c and 38b (see FIGS. 8 and 9). ) Is connected by a resin rivet 43 which is commonly inserted (see FIG. 6).

When the rear cushion 30 is initially adjusted, the notch portion of the rear fender 29 can be obtained by removing the main seat 25 shown in FIG. 1 and then removing the cover 37 and the lid 38 as shown in FIG. Since the opening 29a is exposed and the opening formed between the main frames 8 above the rear cushion 30 is opened, the adjustment tool 36 is inserted from above to form the rear cushion 30.
The initial adjustment can be easily performed without removing the rear fender 29. Then, after the initial adjustment, the cover 37 and the lid 38 may be attached as shown in FIG.

[0042]

As is apparent from the above description, claim 1
According to the invention described, since the rear frame is welded and integrated with the left and right main frames, the mounting accuracy of the rear frame to the main frame is higher than that of the one fastened with the conventional bolts. The effect that the mounting accuracy of the rear fender mounted on the rear frame is also improved, the misalignment in the width direction between the rear fender and the rear wheel is suppressed to be small, and the mounting strength of the rear frame is also enhanced. To be Further, since the rear frame is arranged in the rear fender and the whole of the rear frame is covered by the rear fender, the rear frame does not form an external component, and therefore, the rear frame is subjected to processing for enhancing the external appearance. There is no need, and there is an effect that the cost of the rear frame can be reduced.

According to the second aspect of the invention, since the rear frame is welded and integrated with the main pipe through the bracket which is a forged component, the effect of further increasing the mounting strength and mounting accuracy of the rear frame can be obtained.

According to the third aspect of the invention, since the three-dimensional surface is formed on the bracket, it is possible to obtain the effect of ensuring higher rigidity of the bracket while avoiding interference with the rear arm.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle.

FIG. 2 is a side view of a body frame of a motorcycle.

FIG. 3 is a cutaway side view of a rear arm portion of a motorcycle showing a rear fender mounting structure according to the present invention.

FIG. 4 is a partial side view of a rear arm portion of a motorcycle showing a rear fender mounting structure according to the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is a partial side view around a rear cushion of the motorcycle.

FIG. 7 is a partial plan view of a rear fender of a motorcycle.

FIG. 8 is a perspective view of a cover.

FIG. 9 is a perspective view of a lid.

FIG. 10 is a side view showing a procedure for initial adjustment of the rear cushion.

[Explanation of symbols]

1 motorcycle 2 head pipe 8 main frames 18 rear frame 29 Rear fender 35 Bracket (forged parts)

Claims (3)

[Claims] 1. A rear frame is attached to a rear end portion of a pair of left and right main frames that extend outward from the head pipe and exposed outward in the vicinity of a lower portion of the seat, and a rear fender is attached to the rear frame. A rear fender mounting structure for a motorcycle, wherein the rear frame is arranged inside the rear fender and welded to the main pipe so as to be integrated. 2. The rear fender mounting structure for a motorcycle according to claim 1, wherein the rear frame is welded and integrated with the main pipe via a bracket which is a forged component. 3. The bracket has a side surface and an upper surface that extend upward from the main frame and then bends inward in the vehicle width direction, and a front surface formed so as to connect the front portions of the side surface and the upper surface. The rear fender mounting structure for a motorcycle according to claim 2, wherein a three-dimensional surface having a vehicle width is formed.