JPH01164688A - Car body frame of motorcycle - Google Patents

Abstract

PURPOSE: To improve rigidity and easily fit on-vehicle components by connecting the reinforcement section of an arm bracket and a main frame with a front rail to form a triangular rear frame bracket, and removably fitting a rear frame to it. CONSTITUTION: The front end of a front rail 10 is welded to the rear section upper face of a main frame 3, and the rear section is welded to the upper face of a reinforcement section 5a, thus a rear frame bracket 32 having a nearly triangular shape on the side view is formed with the rail 10, reinforcement section 5a and the rear section of the main frame 3. A rail support section 10a is integrally formed on the rear end section of the rail 10, i.e., on the upper end section of the rear side of the bracket 32, and the front end 9b of a seat rail main body 9a on the same straight line as the support section 10a is removably fitted to the support section 10a with bolts. A rear frame 9 is fitted to the bracket 32, the rigidity of the junction of the main and rear frames 3, 9 can be improved, various support sections are formed on the front frame 10, and many on-vehicle components can be easily mounted.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a motorcycle body frame, and particularly to a case where a pair of left and right rear frame frames are connected to the rear ends of a pair of left and right main frames. This invention relates to improving the rigidity of the rear frame connection portion and facilitating the installation of in-vehicle components.

[Conventional technology]

On the body frame of a motorcycle, there is a left steering shaft cylinder.

A pair of right main frames are connected, and an arm bracket for pivotally supporting a rear arm is welded and fixed to the rear end of each main frame, and a left and right rear frame consisting of a seat rail and a back stay is attached near the connection part. There is something connected. In such a vehicle body frame, the seat rail and backstay are attached to the mounting brackets formed on the main frame and arm bracket, respectively, by tightening bolts from the viewpoint of improving maintenance workability (for example, in the case of boat fishing). 62-43107).

In addition, as for the installation of the rear frame, as another conventional example of the structure,
There is also a structure in which the arm bracket is extended upward and the front end of the seat rail is bolted and fixed to the upper end of the cough extension.

(For example, see Japanese Patent Application Laid-Open No. 62-205886.) [Problems to be Solved by the Invention] By the way, the main frame of a motorcycle is subject to a large load, so various shapes and other modifications are required to obtain sufficient rigidity. Therefore, it is undesirable to perform any processing on this main frame that would reduce the section modulus.However, in the structure described in the former publication, in which the seat rail is bolted and fixed to the main frame, , the design requires a mounting bracket for bolting to be attached to the main frame by welding, etc.

There is a concern that the rigidity of the main frame may decrease depending on how it is manufactured.

On the other hand, in the structure described in the latter publication, since there is no need to provide a seat rail mounting bracket on the main frame, concerns about a decrease in the rigidity of the main frame can be eliminated. However, it is necessary to install a large number of in-vehicle parts such as the fuel tank, tank cover, driver's seat or pantry case near the connection between the main frame and the seat rail. In this case, there is no member between the upper extension part of the arm bracket and the main frame that forms the attachment part for the vehicle-mounted parts, which is disadvantageous in this point.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional situation, an object of the present invention is to provide a motorcycle body that can improve the rigidity near the connection part between the main frame and the carrier frame, and can easily attach a large number of on-vehicle parts to the vicinity of the connection part. The purpose is to provide a frame.

[Means for solving problems]

The present invention provides a body frame for a motorcycle in which a rear frame is detachably attached to a pair of left and right main frames in the vicinity of arm bracket connection parts, and in which a reinforcing part is integrally formed by extending the upper end of the arm bracket upward. , a front rail constituting the front part of the seat rail is constructed and fixed between the reinforcing part and the rear upper surface of the main frame, so that the front rail, the reinforcing part, and the rear side of the main frame are A rear frame bracket having a substantially triangular shape in view is formed, and a plurality of in-vehicle component mounting parts are formed on the upper side of the rear frame bracket, and the front end of the seat rail body is attached to the upper rear side of the rear frame bracket, and the front end of the seat rail body is attached to the upper rear side of the rear frame bracket, and the front end of the seat rail body is attached to the upper rear side of the rear frame bracket. The front end of the backstay is removably attached to the front end of the backstay.

Here, the shape of the rear frame bracket in the present invention includes a case where the rear part of the front rail is placed and fixed on the upper surface of the reinforcing part of the arm bracket, and the front end of the seat rail main body is attached to the rear end of the front rail. This includes both cases in which the rear end of the front rail is fixed against the front of the upper end of the reinforcing part, and the front end of the seat rail body is attached to the upper @ rear surface of the reinforcing part, and furthermore, this front rail is cast. This also includes those formed integrally with the arm bracket.

[Effect]

According to the motorcycle body frame according to the present invention, the rear part of the main frame is located near the connection part of the arm bracket;
The rear frame bracket, which is approximately triangular in side view, is formed by the reinforcing part that is an extension of the arm bracket and the front rail installed between them.This bracket improves the rigidity of the rear part of the main frame, and also makes it possible to improve the rigidity of the main frame. There is no need to form a seat rail mounting bracket as in the conventional example.

Further, since the front rail is installed between the reinforcing portion and the main frame, it is possible to use this portion to form a large number of mounting bosses for mounting on-vehicle components, and it is possible to easily mount a large number of on-vehicle components.

〔Example〕 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 9 are diagrams for explaining a body frame of a motorcycle according to an embodiment of the present invention.

In the figure, reference numeral 1 denotes a motorcycle employing the frame of this embodiment, and the body frame 2 of this vehicle is of a so-called double cradle type constructed as follows. That is, the steering shaft cylinder 4 is located between the front ends of the left and right main frames 3.3.
At the same time, an arm bracket 5 is welded and fixed to the rear end of each main frame 3, and a pair of left and right downs are connected between the lower end of each arm bracket 5 and the front lower surface of each main frame 3. The tube 6 is removably attached, and the left and right arm brackets 5, 5 are connected by upper and lower cross vibes 7.8.

A front fork 13, which pivotally supports the front wheel 12 at its lower end, is rotatably supported on the steering shaft cylinder 4 to the left and right.
A rear arm 15, which pivotally supports a rear wheel 14 at its rear end, is pivotally supported in the middle of the arm bracket 5 so as to be able to swing up and down.

A link member 17 of a rear wheel suspension W16 is disposed between the front part of the post-cough arm 15 and the lower cross pipe 8. A lower end of a buffer 18 is pivotally supported by the link member 17, and an upper end of the buffer 18 is pivotally supported by the center of the upper cross pipe 7. Further, an engine unit 19 is suspended below the main frame 3 of the vehicle body frame 2.

At the upper end of the arm bracket 5, a reinforcing portion 5a is provided.
is integrally formed so as to extend upward 1, and the reinforcing portion 5
a. A front rail 10, which forms the front part of the seat rail, is stretched between the rear portions of each of the main frames 3. The front end of this front rail 1o is welded and fixed to the rear upper surface of the main frame 3, and the rear part is fixed to the reinforcement part 5a.
The front rail 10. is fixed by welding while being placed on the upper surface of the front rail 10. A rear frame bracket 32 having a generally triangular shape in side view is formed at the rear of the reinforcing portion 5a and the main frame 3.

A rail support portion 10a is integrally formed at the rear end of the front rail 10 that constitutes the upper side of the rear frame bracket 32, that is, at the upper end of the rear side of the bracket 32.
A front end 9b of a seat rail main body 9a, which is in the same straight line as the support portion 10a, is removably attached to the support portion 10a by tightening bolts. In addition, the above rear frame bracket 3
A stay support part 5b is formed at the lower part of the reinforcing part 5a constituting the rear side of the back stay 11, and the front end ita of the back stay 11 is fixed with bolts to the support part 5b. The rear end of this back stay 11 is welded and fixed to the rear lower surface of the seat rail body 9a, and the rear frame 9 is constituted by this back stay 11 and the seat rail body 9a.

Further, between the rear portions of the left and right front rails 10, a battery case 29 that accommodates the battery 30 is arranged in the longitudinal direction of the vehicle. The right side wall of this battery case 29 is located inside the rail support portion 10a of the right front rail 10.
The left side wall is fixed to case support portions 10d protruding from the left front rail 10 with mounting pins 1-298. Note that the rear end of the lower surface of the battery case 29 is located at the front end of the reinforcing member 15a fixed to the rear arm 15, and although not shown, the front end of the reinforcing member 15a is A relief part is formed to avoid interference with the pantry case 29.

Further, a driver seat 31 is disposed above the pantry case 29 so as to cover the case 29. A hook member 24i attached to the center of a rear wall 24e of the tank cover 24, which will be described later, is inserted and locked into a locking hole formed at the center of the front end of the seat 31. Further, the seat 31 has a pair of left and right locking pieces 31b protruding from the bottom wall of the seat 31, which are attached to the rail support portions of the left and right front rails 10.
0a, and is supported by this rail support portion 10a.

A fuel tank 20 is mounted on the front side of the battery case 29 between the left and right front rails 10. This fuel tank 20 is made of a steel plate by welding the flange parts of the left and right tank members together, and the locking bracket 20a formed on the front wall of this tank is not shown, but the left and right tank members are welded together. The main frame 3.3 is secured to a support member installed between the main frames 3 and 3 via an elastic member. Further, support brackets 20b and 20C are welded and fixed to the left and right corners of the rear wall of the 1i fuel tank 20, and the support brackets 20b and 20C are connected to the left and right front rails 1.
The tank support portions 10b and 10c integrally formed with the tank support portions 10b and 10c are fixed via bushings 21 with bolts 21a. Note that a recess is formed in the rear wall of the fuel tank 20 to avoid interference with the puffer case 29.

This is due to the fact that the pantel case 29 is disposed in the front-rear direction as described above. As shown in FIG. 8, the bushing 21 is constructed by arranging a main grommet 21b on the lower side, a sub grommet 21c on the upper side, and inserting a collar 21d into the main grommet 2Ib.

An air cleaner 23 is mounted on the front side of the fuel tank 20, and a tank cover 24 that covers the air cleaner 23 and the fuel tank 20 is provided above the main frame 3.3.

This tank cover 24 is made of a steel plate, and the lower end surface 24h of the side wall of the tank cover 24 is connected to the main frame 3. and is formed to follow the top surface shape of the front rail 10, and a support piece 24d is fixed to the front end portion 24c of the side wall. As shown in FIG. 5, this support piece 24d is bolted to a support bracket 27 on the vehicle body side via a damper 26a made of an elastic member, and the support bracket 27 is bolted to the steering shaft cylinder 4. Fixed radiator bracket 2nd is welded and fixed.

Further, as shown in FIG. 7, the rear end portion 24e of the side wall is bolted to a support bracket 20e fixed to the rear wall of the fuel tank 20 via a damper 26b. Furthermore, as shown in FIG. 6, an insertion portion 24g is formed on the left and right side portions 24f of the side wall to extend downward, and a rubber grommet 26C is provided at the lower end of the insertion portion 24g. It is installed. This grommet 261. is inserted into a locking groove 10d recessed in the upper surface of the rail bracket 10, whereby the front, rear, left and right portions of the side wall of the tank cover 24 are fixed to the vehicle body frame 2.

Next, the effects of this embodiment will be explained.

As mentioned above, a large load acts on the body frame of a motorcycle, so it is important to ensure sufficient rigidity. Therefore, in this embodiment, the upper part of the arm bracket 5 is extended to form a reinforcing part 5a, and the reinforcing part 5a and the rear part of the main frame 3 are connected by a front rail 10. A rear frame bracket 32 having a generally triangular shape in side view is formed, and the rear frame 9 is attached to this. Therefore, there is no need to form a conventional seat rail mounting bracket at the rear of the main frame 3, and concerns about a decrease in the rigidity of the main frame 3 itself can be avoided.

Further, the triangular rear frame bracket 32 itself can improve the rigidity of the connecting portion between the main frame 3 and the rear frame 9.

Further, since the front rail 10 is located between the reinforcing portion 5a and the main frame 3, various supporting portions can be formed in this portion, and a large number of vehicle components can be easily mounted. Moreover, in this case, the front rail 10 is formed to extend rearward through the upper surface of the reinforcing portion 5a, and the front rail 10 is
Since the above-mentioned various parts are mounted on the 0, each part is supported on one common member, and the arrangement accuracy between the parts can be improved accordingly.

In addition, since the rear frame 9 is connected to the rear end of the rear frame bracket 32, the seat rail body 9a is shorter than the conventional structure in which the rear frame is directly attached to the main frame. The ease of handling the carrier frame 9 can be improved.

In the above embodiment, the front rail 10 has a shape extending rearward from the upper surface of the reinforcing portion 5a, but in the rear frame bracket of the present invention, the front rail 10 is connected to the upper end front wall of the reinforcing portion 5a and the main frame. It may be arranged so as to be sandwiched between the two.

Further, in the above embodiment, the reinforcing portion of the arm bracket and the front rail are separate bodies, but they may be formed integrally.

〔Effect of the invention〕

As described above, according to the body frame of a motorcycle according to the present invention, the upper end of the reinforcing portion which is an extension of the arm bracket;
The rear upper surface of the main frame is connected with the front rail to form a roughly triangular rear frame bracket, and the rear frame is removably attached to the bracket, which has the effect of improving the rigidity of the rear frame attachment part. Moreover, there is an effect that a large number of vehicle-mounted parts can be easily attached using the upper side of the rear frame bracket.

[Brief explanation of the drawing]

1 to 9 are diagrams for explaining a body frame of a motorcycle according to an embodiment of the present invention, in which FIG. 1 is a side view thereof, FIGS. 2 and 3 are a plan view thereof, and FIGS. Figure 4 is a rear view of the arm bracket part, Figures 5 to 7 are a cross-sectional side view of the front end attachment part, a cross-sectional front view of the side attachment part, a cross-sectional side view of the rear end attachment part, and Figures 5 to 7 are respectively a cross-sectional side view of the tank cover. 8
The figure is a sectional side view of a tank mounting bush, and FIG. 9 is a side view of a motorcycle to which the above embodiment is applied. In the figure, 1 is a motorcycle, 2 is a body frame, and 3.
3 is a pair of left and right main frames, 4 is a steering shaft cylinder, 5 is an arm bracket, 5a is a reinforcement part, 9 is a rear frame,
9a is the seat rail body, 10 is the front rail, 108~
10d is a support part (vehicle parts attachment part), 11 is a back stay, 15 is a rear arm, and 20, 24, 29.31 is a fuel tank. Tank cover, panteri case, seat (31 in-vehicle parts), 32 is rear frame bracket. Patent Applicant Yamaha Motor Co., Ltd. Agent Patent Attorney Tsutomu Tsutomu Figure 4 Figure 7

Claims (1)

[Claims] (1) An arm bracket for pivotally supporting the rear arm is welded and fixed to the rear ends of the pair of left and right main frames extending rearward from the steering shaft cylinder, and a seat rail and a back stay are installed near the connection part of the arm bracket. In a motorcycle body frame with a removably attached rear frame,
A reinforcing part is integrally formed by extending the upper end of the arm bracket upward, and a front rail constituting the front part of the seat rail is constructed and fixed between the reinforcing part and the rear upper surface of the main frame. A rear frame bracket having a generally triangular shape in side view is formed by the rear frame rail, the reinforcement portion, and the rear part of the main frame, and a plurality of in-vehicle component mounting portions are formed on the upper side of the rear frame bracket. A body frame for a motorcycle, characterized in that the front end of a seat rail body is removably attached to the upper part of the rear side and the front end of a backstay to the lower part of the rear side.