JPS62205887A - Tubular frame material - 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] [Field of Industrial Application] The present invention relates to a tubular frame material, and particularly to a method for strengthening the rigidity of the joint end of a tubular frame material used in a motorcycle with another frame material. , relates to a tubular frame material that is passed through to reduce the number of parts and processing steps.

[Conventional technology]

Conventionally, in the body frame structure of a two-wheeled motor vehicle, for example, as shown in FIG. 7, a seat rail frame 17 and a sub-frame 18 are connected to a main frame 16 connected to a top pipe 15 by tightening bolts 19, respectively. , and the down tube 2 connected to the top vibe 15
0 is fixed to the lower part of the non-frame 16 by tightening bolts 19.

On the other hand, the connection between the seat rail frame 17 and the subframe 18 is also fixed with bolts 19.

The structure of the connecting end of each of these frames 17, 18, 20 with other members is as shown in FIG.
As shown in the figure, an inner pipe 23 is fitted into the pipe hole and the end is flattened to form a bolt hole 24.
Also, a drain hole 25 for painting inside the tube hole is formed.

[Problem that the invention seeks to solve]

In the tubular frame materials 17, 18, 20 shown in the conventional example, regardless of whether the pipe material is a round pipe or a square vibe, if the joint member 21 is fitted to the connecting end with the base material, the joint member 21 is required, which increases the number of parts, and requires man-hours for welding 22 at the contact portion between the tubular frame and the joint member 21, increasing costs.

In addition, as shown in Fig. 9, in the case where the bolt holes 24 are opened by flattening one end of the tubular frame, the thickness is thin, so it is difficult to perform processes such as carving a female thread in the bolt holes 24. (In addition, it required man-hours and materials to fit the inner pipe 23, and it was also necessary to open the drain hole 25.

[Means for solving problems]

The present invention solves the above problems and provides a tubular frame material that can significantly reduce weight and cost by crushing the connecting end in one direction and opening the bolt hole without using a joint member. It was developed with the aim of Two opposing wall surfaces are folded inward toward the inside of the tube hole, and the two opposing wall surfaces are crushed in opposing directions at a position perpendicular to the invagination direction to form a flat surface. It constitutes a tubular frame material characterized by having bolt holes drilled in the frame, and preferably, the connecting end has a drainage gap that communicates with the pipe hole of the frame between the opposing intercultivated invaginations. It is characterized by the formation of

[Effect]

If the tubular frame material is made into a rectangular tubular shape, for example, and the connecting end formed at one end in the longitudinal direction is folded halfway into the pipe hole with the upper and lower two wall surfaces facing each other as the bending line at the center of the width, In the cross section of the pipe opening, the earthen wall is approximately W-shaped with the two side walls and the lower wall. When both the left and right walls are crushed and flattened toward the center of the tube hole, the upper and lower walls are folded in half and sandwiched between the left and right walls, that is, the width of this connecting end in the plane is It is four times the wall thickness of the pipe, which is several times the thickness of the conventional pipe shown in Figure 9, and has excellent rigidity. Connections can be fixed.

Furthermore, since the connection end is thick, it is sufficiently durable even when a female thread is formed in the bolt hole, and members such as a joint member and an inner vibe can be omitted.

〔Example〕

Embodiments of the present invention will be described based on the drawings. FIG. 1 shows the main parts of the body frame structure of a motorcycle.

A main frame 5 is integrally installed between the top vibe 4 and the pivot part 6, and a fixing seat 5A is provided in the longitudinal middle part of the main frame 5, and the connecting end IA of the seat rail frame 1 is fixed with bolts 7. It is tightened and fixed to the seat 5A. The seat rail frame l is made of a rectangular tube (not shown), but when viewed from above, it is formed in a pair of parallel arrangements on the left and right sides of the vehicle body, and the seat (not shown) and the rear part of the fuel tank are placed on top of this. It is supported and fixed by a subframe 2 provided diagonally rearward from the pivot portion 6.

A fixing seat 6A is provided at the upper rear portion of the pivot portion 6, and the connecting end portion 2A of the subframe 2 is tightened and fixed with a bolt 7.

The subframe 2 is made of a square tube, and has connection parts 2A at both ends.
, 2B are formed, and the upper connecting end 2B facing obliquely upward is fixed to the fixing part IB of the seat rail I by tightening bolts 7.

Further, the upper end of the down tube 3 is fixed to the top pipe 4 by welding, and the connecting end 3A formed at the lower end of the down tube 3 is fixed to the engine 8 side with bolts 7 so as to suspend the engine 8. .

Seat rail frame 1 shown in FIG. Subframe 2. Both of the down tube 3 and the down tube 3 are frame members constituting the vehicle body frame structure, and will be generally described below as a tubular frame member 9 in FIG. 2. The connecting ends IA, 2A, 2B, and 3A of these tubular frame members 9 will be collectively described as 10 in FIG.

The tubular frame material 9 has a rectangular tubular shape, and has a predetermined length at one end as a connecting end 10 for connection with other members, and has an upper wall 9A and a lower wall as shown in FIG. When the center part of each width of 9B is folded in the middle with the press die 12 toward the center O of the tube hole, as shown in FIG.
The shape is approximately W between both side walls 9G and 9D and the lower wall 9B.
It shows the glyph shape. In Fig. 4, both side walls 9G, 9D
When pressed flat with the press mold 12 toward the center 0 of the tube hole, an upper wall 9A is formed between the both side walls 9C and 9D as shown in FIG.
The lower wall 9B is folded inward.

Therefore, the height h of the side walls 9G and 9D is higher than that of the upper wall 9A.
If the length is longer than W, as shown in FIG.
G communicates with the tube hole 9H of the tubular frame material 9, and this serves as a drainage gap for the machining fluid on the surface of the tubular frame material 9.

A bolt hole 1) can be formed through the flat surface of the connecting end 10 thus formed, and a female thread (not shown) can be formed on the inner peripheral surface of the bolt hole 1).

As explained above, the tubular frame material 9 according to the present invention has a connection end portion 10 at one end thereof that allows connection with other members.
is formed, and the connecting end lO is connected to the upper and lower walls 9A in the figure.
, 9B are both side walls 9C.

Since it is flattened and compressed in a way that it is folded in the middle between 9D, there is no need to fit a joint member into the pipe or an inner pipe (it is not necessary to fit a joint member into the pipe or to insert an inner pipe into the pipe). The connecting end 10 can be formed with a certain degree of rigidity.

Further, since the connecting end 10 has a thick wall, there is no problem in terms of strength even if a female thread is carved on the inner peripheral surface of the bolt hole 1) and a threaded bolt is directly screwed into the bolt hole 1). Therefore, this tubular frame material 9 can be used for each of the frames 1, 2, and 3 forming the vehicle body frame structure shown in FIG. 1, depending on the purpose of use.

Note that the present invention is not limited to the embodiments described above, and the design can be changed as appropriate. For example, FIG. 5 shows the end face of the connection end in another embodiment, with a drain gap of 9G.
The center of the tube is shifted from the center of the tube hole in the lateral direction, and the lengths of both side walls 90.9D are slightly different.

Further, FIG. 6 shows still another embodiment, and shows the end face of the connecting end implemented on a round tubular frame material.

These tubular frame members are used as the seat rail frame 1 shown in FIG. Subframe 2. In addition to being used for the down tube 3, it can also be used for these attached frames.

〔effect〕

The present invention has the following excellent effects.

A. Since the connecting end is formed by folding the two opposing wall surfaces of the tube into the tube hole, the tube does not become wider than the tube diameter even if it is flattened, and the wall is thick and has excellent rigidity.

B. Since a drain gap is formed between the opposing center-folded recesses during the press molding process, the number of man-hours required to create a drain hole can be saved.

Since the C0 connection end is flat but thick, it has sufficient strength even if a female thread is formed in the bolt hole and a bolt is directly screwed into it.

D. Members such as joint members and inner pipes can be omitted, and the cost can be reduced because it can be easily implemented on ordinary pipes.

[Brief explanation of drawings]

The drawings relate to the present invention, and FIG. 1 is a side view showing the body frame structure of a two-wheeled motor vehicle, FIG. 2 is a perspective view of a tubular frame material, FIG. 3 is an end view of the connection end before processing, and The figure is an end view showing the processing process of the connection end, FIGS. 5 and 6 are end views of the connection end showing other embodiments, FIG. 7 is a perspective view of the conventional vehicle body frame structure, and FIG. FIG. 9 is a perspective view of a conventional tubular frame member. l... Seat rail frame IA... Connection end IB... Fixed part 2...
・Subframe static, 2B...Connection end 3...
Down tube 4...Top pipe 5...Nohen frame 5
8...Fixed seat 6...Pivot part 68.
... Fixed seat 7 ... Bolt 8 ... Engine 9 ... Tubular frame material 9A ... Upper wall
9B...Bottom wall 9C, 9D...Side wall
9E, 9F...Central folded part 9G...Drainage gap 9H...Pipe hole 10...Connection end
1)...Bolt hole 12...Press type

Claims (3)

[Claims] (1) Forming a connecting end to be joined to another member at one end of a tubular frame material that constitutes a part of the structure of the vehicle body frame,
The connecting end is formed by folding two opposing wall surfaces toward the inside of the tube hole, and collapsing the two opposing wall surfaces in opposite directions at a position perpendicular to the invaginating direction to form a flat surface. A tubular frame material characterized in that bolt holes are formed in the flat surface. (2) The tubular frame material according to claim 1, wherein the bolt hole is provided with a female thread. (3) The connecting end portion is characterized in that a liquid drainage gap is formed between the opposing center-folded recessed portions and communicates with the pipe hole of the frame. Tubular frame material described in .