JPH0354087A - Frame device for motorcycle - Google Patents

Abstract

PURPOSE:To eliminate a firm cross member between frames on both sides and to improve a rigid feeling in terms of appearance by a method wherein a seat rail and a rear arm bracket are integrally molded, and the wide surface, formed in a vertical direction, of the seat rail is exposed sideways of a car body. CONSTITUTION:A car body frame 1 of a motorcycle comprises a head pipe 2 made of aluminum casting, a pair of main frames 3 on both sides, a seat rail 4, and a rear arm bracket 5. The rear frame 6 formed with the seat rail 4 and the rear arm bracket 5 is integrally cast and welded to the main frames 3. The front and the two sides of the motorcycle are covered with a cowling 17, and the rear part of the motorcycle is covered with a side cover 19. Constitution in which the shape of approximately the whole of the head pipe 2, the main frame 3, the seat rail 4, and the rear arm bracket 5 is visible from the outside is employed.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a frame device for a motorcycle.

[Conventional technology] Conventionally, the rear frame of a motorcycle for supporting the seat is constructed using a plurality of pipe materials, framed by a pair of left and right seat rails and a back stay, with side covers on both the left and right sides. This covers electrical components such as batteries and the support part of the vehicle installed in the space below the seat.

However, according to this configuration, it is necessary to provide the side force bar and the attachment part of this side cover on the rear frame side, which increases the number of parts.In addition, since the side covers are provided on both sides, the seat must be lowered. However, it had the disadvantage that the driver's feet could not reach the ground.

In order to solve this problem, the applicant has proposed
! In Publication No. 185, the frame is divided into a main frame and a seat rail fixed to the rear of the main frame, and the seat rail is formed into a pair of press-formed flat plate-shaped left and right frame materials. In addition to being long in the direction and wide in the vertical direction,
We are proposing a frame with its wide side exposed on the side of the vehicle.

[Problems to be Solved by the Invention] However, in the frame disclosed in the above-mentioned Japanese Patent Application Laid-open No. Sho El 2-98185, since the seat rail is made of a pair of press-formed flat plate-shaped left and right frame materials, there is a gap between the left and right frames. It is necessary to span multiple cross members as strength members, and it is also necessary to separately provide mounting members for attaching electrical components such as batteries and the rear cushion support, which poses the problem of increased assembly man-hours and weight. are doing.

The present invention solves the above problems by forming the seat rail integrally with the rear arm bracket, thereby eliminating the need for a strong cross member between the left and right frames, and by exposing the entire frame. An object of the present invention is to provide a frame device for a motorcycle that can further emphasize the strong rigidity of the frame in terms of appearance.

[Means for Solving the Problems] To this end, the frame device for a motorcycle of the present invention includes: a head vip 2 that supports a front fork 7; a pair of left and right main frames 3 branching from the head vipe 2;
It has a seat rail 4 that is connected to the main frame 3 and supports a seat 13, and a rear arm bracket 5 that is connected to the seat rail 4 and supports a rear arm 10. 4 and the rear arm bracket 5 are made of the same material, and at least the seat rail 4 and the rear arm bracket 6 are integrally molded. It is characterized in that it is exposed laterally and the width of the left and right seat rails 4 is made approximately the same as the width of the seats 1 and 13.

Note 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.

[Function] In the present invention, as shown in FIG. 1, for example, the front and both sides of the motorcycle are covered with a cowling 17, and the rear part of the motorcycle is covered with a side force bar 19.
Since substantially the entire shapes of the head vip 2, main frame 3, seat rail 4, and rear arm bracket 5 can be visually recognized from the outside, the strong appearance of the frame can be further emphasized.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an overall side view of a motorcycle according to the present invention. A rear frame 6 consisting of a seat rail 4 and a rear arm bracket 5 is cast on the body and welded to the main frame 3.

A front fork 7 is rotatably supported on the hend pipe 2, and a front wheel 9 is provided at the lower part of the front fork 7. Also,
A rear wheel 11 is supported on the rear arm bracket 5 via a rear arm 10, while the upper part of the main frame 3 is covered with a cover 12 for driving the vehicle. Further, a main seat 13 is provided on the seat rail 4, and an auxiliary seat 16 is provided on a rear tube 15 connected to the seat rail 4.

The front and both sides of the motorcycle are covered with a cowling 17, and the rear of the motorcycle is covered with a side force bar 19, which covers almost the entire head pipe 2, main frame 3, seat rail 4, and rear arm bracket 5. The configuration is such that the shape is visible from the outside. A mechanical engine 20 is mounted and fixed between the main frame 3 and the rear arm bracket 5, and an exhaust pipe 21 from the mechanical engine 20 passes below the vehicle body, extends rearward, and is connected to a silencer 22. . Furthermore, a rear arm bracket 23 is supported by the rear arm bracket 5 via a link mechanism 24.

2 to 4 show the structure of the main frame 3, with FIG. 2 being a perspective view, FIG. 3 being a side view, and FIG. 4 being a sectional view taken along line IV-IV in FIG. 3.

As shown in FIG. 4, the pair of left and right main frames 3 are
An outer frame 3a and an inner frame 3b, which have a U-shaped cross section, are fixed by welding, and are formed hollow with a substantially rectangular cross section, with their wide surfaces exposed on the sides of the vehicle body.

Then, as shown in FIG. 4(a), the rigidity of the main frame 3 is increased by tightening bolts 32 through elastic members 30 and washers 31 into holes formed horizontally in the outer frame 3a and inner frame 3b. It is raised and prevents vibration. In this example, the washer 3l and bolt 32 are visible from the outside, so these parts are attached to the cowling 1.
Make sure to cover it with 7. FIGS. 4(b) and 4(c) show an example in which the washer, bolt, etc. are not visible from the outside. In FIG. 4(b), the elastic material 30 is pushed in with the claw bolt 33 to connect the outer frame 3a. In (C), the outer frame 3a and the inner frame 3b are fixed by tightening the elastic members 30 with bolts 35. Moreover, as shown in FIG. 2, a rib 3ct3d is formed at one end of the outer frame 3a.

Figure m5 (a) is a side view showing the structure of the main frame and rear frame, Figure 5 (b) is a view of the rear frame seen from the rear, and Figures 6 and 7 are the connection structure between the seat rail and the main frame. 6 is a sectional view taken along the line Vl-Vl in FIG. 5(a), and FIG. 7 is a sectional view taken along the line Vl-Vl in FIG.
) is a cross-sectional view taken along line ■-■.

As described above, the seat rail 4 and the rear arm bracket 5 that constitute the rear frame 6 are integrally formed by aluminum casting. The width of the pair of left and right seat rails 4 is made substantially the same as the width of the main seat 13. seat rail 4
On the back side of the rear arm bracket 5, a rib 51 for supporting the rear cushion 23, a boss section 53 for attaching the battery box 52, and a shelf section 55 are integrally molded. In addition to bosses 56 and 57 for supporting the mirror 20, a large number of bosses are integrally molded.

As shown in FIG. 5(b), a cross member 25 is fixed to the lower portions of the left and right rear arm brackets 5 at welded portions 5g by welding. Further, a cross member 28a for attaching a rear cushion is welded to the center part of the left and right rear arm brackets 5, and a cross member 28b is further welded to the upper part. The cross member 25 has a substantially U-shape, and a rear cushion bracket 26 and an engine mounting stay 27 are integrally formed.

Note that 29 is a drive chain.

As shown in FIG. 6, the seat rail 4 and the main frame 3 are connected by connecting the outer frame 3a and the inner frame 3b to the seat rail') stage MS 4 a 14b.
At the same time, as shown in FIG. 7, the rib 3c of the outer frame 3a explained in FIG. 2 is pushed into the groove 40 formed in the seat rail 4, and the other rib 3d is After contacting the stepped portion 4d, it is fixed by welding.

FIG. 8 is a sectional view taken along line 1-1 in FIG. 5 for explaining the mounting structure of the battery box.

The figure shows only the left side of the rear of the vehicle, and the right side is omitted because it has the same left-right symmetrical structure. The battery box 52 for accommodating the battery 58 is shaped to be placed on a stepped portion 55 formed on the seat rail 4, and has a boss portion 53.
It is fixed with bolts 59.

Note that the present invention is not limited to the above-mentioned embodiments, and various modifications can be made.

For example, in the above embodiment, the main frame 3 and the rear frame 6 are molded separately, but they may all be molded into one piece.

[Effects of the Invention] As explained above, in the present invention, by forming at least the seat rail integrally with the rear arm bracket, sliding of the rear frame is simplified, and the cross member between the left and right frames is used as a strength member. By exposing the entire frame, the frame forms the design surface of the vehicle body, further emphasizing the strong rigidity of the frame in appearance.

Further, since there is no need to separately provide a mounting member for mounting electrical components such as a battery or a support portion of the rear cover, assembly man-hours and weight can be reduced.

[Brief explanation of drawings]

FIG. 1 is an overall side view of a motorcycle which is an embodiment of the present invention, FIGS. 2 to 4 show the structure of a main frame 3, FIG. 2 is a perspective view, and FIG. 3 is a side view. Figure 4 is the third
5(a) is a side view showing the structure of the main frame and rear frame; FIG. 5(b) is a view of the rear frame from the rear;
7 and 7 show the connection structure between the seat rail and the main frame, and FIG. 6 shows the Vl-V in FIG. 5(a).
7 is a sectional view taken along line 1 in Figure 5(a), and Figure 8 is a sectional view taken along line 1 in Figure 5 to explain the battery box mounting structure. FIG. 7...Front fork, 2...Head pipe, 3
... Main frame, 4... Seat rail, 5...
・Rear arm bracket, 10...Rear arm, 13
...Sheet.

Claims (1)

[Claims] (1) A head pipe that supports the front fork, a pair of left and right main frames that branch from the head pipe, a seat rail that is connected to the main frame and supports the seat, and a rear arm that is connected to the seat rail. The main frame, the seat rail, and the rear arm bracket are made of the same material, and at least the seat rail and the rear arm bracket are integrally molded, and the seat rail supports the main frame in the vertical direction. A frame device for a motorcycle, characterized in that a wide surface is formed, the wide surface is exposed on the side of the vehicle body, and the width of the left and right seat rails is made substantially the same as the width of the seat.