JPH05262269A - Rear frame mounting structure of motorcycle - Google Patents

Abstract

PURPOSE:To improve mounting precision of a rear frame by locking together a main frame and a seat rail by means of a screw, and fixing a round hole and an oblong hole by means of a bolt and nut. CONSTITUTION:The round hole A1 of a main frame 5 is caused to coincide with the round screw A2 of a seat rail 21 and fixed by means of a screw. The round screw holes B1 and E1 of the main frame 5 are caused to coincide with the round hole B2 and the oblong hole E2 of a foot rest bracket 25 and fixed by means of a screw. In this state, jolting of the foot rest bracket 25 is absorbed only in a direction Y owing to the presence of the oblong hole E2. Thereafter, the round hole C2 of a back stay 22 is caused to coincide with the oblong hole C1 of the foot rest bracket 25 and fixed by means of a bolt and a nut. In this case, movement only in a direction X is practical owing to the presence of the oblong hole C1 and thus, the rear end D point of a rear frame 6 is prevented from vertical jolting.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as an example of a rear frame which constitutes a rear frame of a motorcycle, there is a rear frame composed of a seat rail 51, a back stay 52 and a cross pipe 53 as shown in FIG. 51, the back stay 52, and the cross pipe 53 are fixed by welding, and one ends of the seat rail 51 and the back stay 52 are fixed to the main frame 55 and the footrest bracket 54 by bolts at points a and c, respectively, and further, Attach the footrest bracket 54 to the main frame 5 at points b and e.
It is fixed to 5 with bolts.

[0003]

However, in the above-mentioned conventional rear frame structure, the main frame 55 is used.
The footrest bracket 54 and the footrest bracket 54 are manufactured by casting, so that the length dimensions of ab and bc can be obtained with high accuracy. However, the seat rail 51, the back stay 52, and the cross pipe 53 are included.
Since it is manufactured by welding a pipe, the accuracy of the length dimension of ac cannot be obtained. Therefore, although the point e of the footrest bracket 54 is adjusted to have a large diameter hole, the triangle a
There is a problem that the shape of bc tends to vary and the position of the point d of the seat rail 51 fluctuates in the vertical direction. Since components such as a seat, a side cover, and a rear fender are attached to the seat rail 51, it becomes difficult to attach the seat rail 51, for example, if the side cover is displaced, it will interfere with the rear fender.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a rear frame mounting structure for a motorcycle which can improve the mounting accuracy of the rear frame.

[0005]

To this end, the invention according to claim 1 of the present invention provides a rear frame mounting structure for a motorcycle, including a main frame 5, a footrest bracket 25 mounted to the main frame 5, and a seat rail. 21 and the back stay 22 are fixed to each other by welding with a cross pipe 23 to the rear frame 6 and the back stay 22.
Round hole C2 formed on the footrest bracket 25
Is provided with a long hole C1 formed in the horizontal direction, the main frame 5 and the seat rail 21 are screwed, and the round hole C2 and the long hole C1 are fixed by bolts and nuts.

Further, in the invention according to claim 2 of the present invention, the main frame 5, the footrest bracket 25 attached to the main frame 5, the seat rail 21 and the back stay 22 are fixed by welding with the cross pipe 23. Both ends of the frame 6 and the cross pipe 23 are fixed to the main frame 5 and the footrest bracket 25. It should be noted that the numbers added to the above configurations are for comparison with the drawings, and the configurations of the present invention are not limited thereby.

[0007]

In the present invention, for example, as shown in FIG.
Due to the existence of the long hole C1, the bolt can be moved only in the X direction, so that the rear end of the rear frame 6 does not rattle up and down. Further, as shown in FIG. 3, since the shape of the triangle ABC is less likely to change, the rear frame can be attached accurately, and the variation in the position of the rear end of the rear frame 6 is reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an overall side view of a motorcycle showing an embodiment of the present invention. The motorcycle 1 has a head pipe 2, a front frame 3, a pair of left and right main frames 5, a rear frame 6, and a head pipe 2. A steering shaft 7 is rotatably connected to the lower part of the steering shaft 7, and a knuckle arm 8 is attached to the steering shaft 7. A front wheel 9 is pivotally supported by the knuckle arm 8, and the front wheel 9 is suspended by an upper arm 10, a lower arm 11 and a front shock 12 which are swingably provided on the main frame 5, and a well-known leading arm type front wheel suspension device is provided. I am configuring.
The engine 13 is mounted and fixed on the main frame 5,
A rear arm 16 supporting a rear wheel 15 is swingably supported on the rear portion of the main frame 5. A front cowling 17 and a front fender 19 are attached to the front frame 2, and side cowlings 20 are attached to the front frame 2 and the main frame 5.

The rear frame 6 comprises a seat rail 21, a back stay 22, and a cross pipe 23. Seat rail 21, back stay 22, cross pipe 23
Are fixed by welding, and one ends of the seat rail 21 and the back stay 22 are fixed to the main frame 5 and the footrest bracket 25 by bolts at points A and C, respectively, and the footrest bracket 25 is further attached at points B and E.
It is fixed to the main frame 5 with bolts at points. A seat 26, a side cover 27, and a rear fender 29 are attached to the seat rail 21, and a front footrest 30 and a rear footrest 31 are attached to the footrest bracket 25.

FIG. 2 shows an embodiment of the rear frame mounting structure of the present invention. FIG. A is a plan view of the main frame, and FIG.
Is a side view of the rear frame, and FIG. C is a plan view of the footrest bracket.

A seat rail mounting piece 5a and a footrest bracket mounting piece 5b are formed on the main frame 5, and a round hole A1 is formed in the seat rail mounting piece 5a.
Round screw holes B1 and E on the footrest bracket mounting piece 5b
1 is formed. A round screw hole A2 matching the round hole A1 on the main frame 5 side is formed at one end of the seat rail 21, and a round hole C2 is formed at one end of the back stay 22. On the main frame 5 side of the footrest bracket 25, a round hole B2 matching the round screw hole B1 and a long hole E2 facing the round screw hole E1 are formed, and on the back stay 22 side, a round hole is formed. A long hole C1 is formed so as to face C2.

The mounting of the rear frame 6 will be described.
The round holes A1 of the main frame 5 are aligned with the round screw holes A2 of the seat rail 21 and fixed with screws, and the round screw holes B1 and E1 of the main frame 5 are fixed to the footrest bracket 2.
5 are matched with the round hole B2 and the long hole E2 and fixed with screws. In this state, the rattling amount of the footrest bracket 25 is absorbed only in the Y direction due to the existence of the long hole E2. Next, the round hole C2 of the back stay 22 is aligned with the long hole C1 of the footrest bracket 25 and fixed with bolts and nuts. At this time, the bolt can move only in the X direction due to the existence of the long hole C1, and therefore,
The rear point D (FIG. 1) of the rear frame 6 does not rattle up and down.

In FIG. A, the main frame 5 is provided with front frame attachment pieces 5c and 5d, a round hole F1 is formed in the attachment piece 5c, and a horizontal elongated hole G1 is formed in the attachment piece 5d. The formed front frame 2 can be prevented from tilting by fixing the front frame 2 with bolts and nuts through the round hole F1 and the horizontal elongated hole G1.

FIG. 3 shows another embodiment of the present invention, in which a cross rail 23, a seat rail 21 and a back stay 22 are provided.
Are fixed by welding, and both ends A and C of the cross pipe 23 are fixed to the main frame 5 and the footrest bracket 25, respectively. In this embodiment, since the shape of the triangle ABC is less likely to change, the rear frame can be attached with high accuracy, and the variation in the position of the point D is reduced.

[0015]

As is apparent from the above description, according to the present invention, the mounting accuracy of the rear frame can be improved and the variation in the rear end position of the rear frame can be reduced.

[Brief description of drawings]

FIG. 1 is an overall side view of a motorcycle showing an embodiment of the present invention.

2 shows an embodiment of a rear frame mounting structure of the present invention, FIG. A is a plan view of a main frame, FIG. B is a side view of the rear frame, and FIG. C is a plan view of a footrest bracket.

FIG. 3 is a side view of a rear frame showing another embodiment of the present invention.

FIG. 4 is a side view showing a conventional rear frame structure.

[Explanation of symbols]

5 ... Main frame, 6 ... Rear frame, 21 ... Seat rail 22 ... Back stay, 23 ... Cross pipe, 25 ... Foot rest bracket C1 ... Long hole, C2 ... Round hole

Claims (2)

[Claims] 1. A main frame, a footrest bracket attached to the main frame, a rear frame in which a seat rail and a backstay are fixed by welding with a cross pipe, a round hole formed in the backstay, and the footrest. A rear frame for a motorcycle, comprising: a bracket having an elongated hole formed in a horizontal direction, the main frame and a seat rail being screwed together, and the round hole and the elongated hole being fixed by bolts and nuts. Mounting structure. 2. A main frame, a footrest bracket attached to the main frame, a rear frame in which a seat rail and a backstay are fixed by welding with a cross pipe, and both ends of the cross pipe are fixed to the main frame and the footrest bracket. Rear frame mounting structure for motorcycles, characterized in that