JPS6296185A - Frame for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to frames for motorcycles.

[Prior art]

Conventionally, in a cradle-shaped or diamond-shaped frame, a rear frame for supporting a seat is constructed by framing a plurality of pipe materials, that is, a pair of left and right seat rails and a backstay.

By the way, in motorcycles, various electrical components such as batteries, air cleaners, etc. are usually installed in the space under the seat, so conventional rear frames made of a combination of pipe materials cannot be used. A side cover is provided on the rear frame, and the side cover covers the electrical components, air cleaner, etc. from the side.

[Problem that the invention seeks to solve]

However, according to this configuration, special side covers,
The installation of this side cover requires a part to be installed on the rear frame side, which leads to an increase in the number of parts.Furthermore, since the rear frame itself is constructed from a combination of pipe materials, the structure around the rear frame becomes even more complicated. It became complicated, and there was room for improvement in terms of cost and weight.

[Means for solving problems]

Therefore, in the present invention, the rear frame is constituted by a pair of left and right frame materials press-formed into flat plates that are long in the front-rear direction and wide in the vertical direction, and the wide surfaces of the frame materials are placed on the side of the vehicle body. It is characterized by being exposed to the side.

[Effect]

According to this configuration, since a single frame material replaces the conventional seat rail and backstay, the number of parts can be reduced accordingly, and the frame configuration can be simplified. At the same time, since the side surfaces of the frame material cover the space under the seat from the sides, the rear frame itself serves the same function as a conventional side cover.

This eliminates the need for the side cover and its attachment, which together with the simplification of the frame structure allows for a further reduction in the number of parts, making it possible to reduce the weight and cost of the frame.

Additionally, the rear frame becomes wider in the vertical direction when viewed from the side, emphasizing its presence, so the rear frame can be used as one of the exterior elements, making it possible to create a new frame shape.

[Embodiments of the invention]

The present invention will be explained below based on an embodiment shown in the drawings.

Reference numeral 1 in the figure indicates a cradle-shaped frame, and this frame 1 is divided into a main frame 2 constituting a front half and a rear frame 3 extending rearward from this main frame 2.

The main frame 2 includes a pair of left and right brackets 8a that linearly connect a steering head vibe 5 that pivotally supports the front fork 4, and a pair of left and right brackets 8a that pivotally support the rad vibe 5 and rear arm 8 to the steering wheel. It is a pipe frame mainly composed of a main vibro and a down tube 7 that connects the front end of the main vibro and the lower end of the bracket 8a, and in the space surrounded by the main vibro and the down tube 7, It is equipped with engine 9.

As shown in FIG. 4, the main vibro of this embodiment has a cross section shaped like a flat rectangular cylinder that is vertically elongated. Dimensions are steering head vibe 5
The length of the longitudinal direction is approximately equal to the axial length of the axial length of the axial direction of the axial direction of the axial direction of the axial direction of the axial direction of the axial direction of the axial direction of the axial direction of the axial direction.

On the other hand, the rear frame 3 includes a pair of left and right frame materials 10 extending rearward and diagonally upward from a connecting portion between the main vibro and the bracket 8a.

This frame material 10 has a plate thickness of, for example, 0.8t to 1.7t.
It is press-formed from a steel plate of about 100 mL, and is formed into a flat plate that is long in the front-rear direction. Moreover, frame material 10
is formed to be wide in the vertical direction, and this wide side surface 10a is exposed on the side of the vehicle body, and the width of this side surface 10a in the vertical direction is a dimension corresponding to the width of the separation between the conventional seat rail and the back stay. It is formed. Further, the vertical width of this frame material 10 is the width of the main frame 2.
It is maximum at the front end connected to the front end, and gradually decreases as it goes rearward from this front end. Therefore, the side shape of the frame material 10 tapers toward the rear.

The frame material 10 has three front end portions that are fastened to boss portions 11 provided on the upper surface of the rear end of the member 6 and the upper surface of the rear end of the bracket 8a through bolts 12. A sheet 13 is placed on this frame material 10. Various electrical components (not shown) such as batteries are arranged in the space below the seat 13, and the left and right sides of this transmission component are
It is covered from the side by the side surface 10a of the wide frame material 10.

Note that a lightening hole 28 is provided in the side surface 10a of the frame material 10 for weight reduction.

An inwardly extending flange wall 14 is integrally bent and formed on the upper edge of the frame material 10, and between the flange walls 14 of the frame material 10, there are cross members 15 at three locations spaced apart in the front and back direction. The frame is spanned and secured by bolts 16 and nuts 17.

Further, another flange wall 18 extending inward is integrally bent and molded on the lower edge of the frame material 10, and the tip of this flange wall 18 is further extended upward to form the wide It forms a reinforcing wall 19 facing the side surface 10a. Therefore, in the case of the present embodiment, a curling portion 20 is formed at the lower edge of the frame material 10 and is curled inward over the entire length.

A support fitting 22 for supporting a passenger footrest 21 is attached to this curling portion 20. The structure of this installation will be explained with reference to FIG. 3. The support fitting 22 is made of pipe material bent into a U-shape.
An opening 23 whose both ends 22a are formed in the flange wall 18
It is introduced into the curling section 20 through. A hollow cylindrical collar 2 is provided at both ends 22a of the support fitting 22.
4 is welded, and this collar 24 is attached to frame material 1.
It is interposed between the side surface 10a of 0 and the reinforcing wall 19.

A bolt 25 is installed between the flat surface 10a and the reinforcing wall 19, passing through the inside of the collar 24. By tightening the insertion end of this bolt 25 with a nut 2G, the support fitting 22 can be fixed. At the same time, the side surface 10a and the reinforcing wall 19 are connected, and the curling width of the curling portion 20 is kept constant.

In addition, the main vibro of the main frame 2 mentioned above.

An air cleaner 30 and a fuel tank 31 connected to the carburetor 29 of the engine 9 from the front are installed in this order between the air cleaner 30 and the fuel tank 3.
1 is covered by a tank cover 32 that extends to the front end of the seat 13 and forms the original fuel tank.

According to such an embodiment of the present invention, the rear frame 3
Since the frame material 10 is formed of a press-formed flat frame material 10, the number of parts is smaller than that of a conventional frame material made of pipe materials, and the frame structure can be simplified accordingly.

Further, since the wide side surface 10a of the frame material 10 is exposed to the side of the vehicle body and covers the electrical components placed under the seat 3 from the side, the rear frame 3 itself also functions as a side cover. It also happens. This eliminates the need for a special side cover and its mounting parts as in the past, which, combined with the simplification of the frame structure mentioned above, allows for a further reduction in the number of parts.
This makes it possible to reduce weight and cost.

Moreover, when compared to a conventional vibe frame, the rear frame 3 is wider in the vertical direction when viewed from the side, which emphasizes its presence and allows the rear frame 3 to be incorporated as one of the exterior elements. This, coupled with the fact that the main vibro is vertically elongated, creates a highly rigid appearance and enables new frame shaping.

Furthermore, since the frame material 10 is a flat press-molded product, when an occupant sits on the seat 3, compression (buckling) force is applied to the lower edge of the frame material 10. Since the curling portion 20 is formed at the lower edge of the frame material 10 and is rolled inward, the curling portion 20 resists the compressive force. Moreover, in this case, since the bolts 25 that fix the support fittings 22 connect the reinforcing wall 19 of the curling part 20 and the side surface 10a, deformation of the curling part 20 when compressive force is applied is prevented, and therefore The strength of the frame material 10 can be increased without requiring any reinforcing parts.

Furthermore, this curling portion 20
Since it also functions as a bracket for supporting the first support fitting 22, there is an advantage in this respect as well, contributing to a reduction in the number of parts.

Note that the frame according to the present invention is not limited to a cradle shape, but can be similarly implemented even if it is a diamond shape.

〔Effect of the invention〕

According to the present invention described in detail above, not only the configuration of the rear frame is simplified, but also the side cover and its attachment can be omitted, so the number of parts can be further reduced, reducing weight and cost. becomes possible. Furthermore, since the presence of the rear frame is emphasized, this rear frame can be effectively used as one of the exterior elements, and an exterior that appears to have high rigidity can be obtained, making it possible to create a new frame shape.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of a motorcycle, Fig. 2 is a side view of a rear frame, and Fig. 3 is a side view of a rear frame.
A cross-sectional view along the line ■-■ in the figure, Figure 4 is IV-r in Figure 1.
It is a sectional view along the V line. 1...Frame, 2...Main frame, 3...
Rear frame, 4... Front fork, 9... Engine, 10... Frame material, 10a... Surface (side surface). Applicant's agent Patent attorney Takeshi Suzue

Claims (1)

[Claims] In a frame for a motorcycle that is composed of a main frame that supports a front fork and an engine, and a rear frame that extends rearward from the main frame and supports a seat on its upper surface, the rear frame is formed by press molding. Equipped with a pair of flat plate-shaped left and right frame materials,
This frame material for a motorcycle is characterized in that the frame material is elongated in the longitudinal direction and wide in the vertical direction, with the wide surface exposed on the side of the vehicle body.