JPS59106383A - Frame structure of 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] The present invention relates to a frame structure for a motorcycle.

Generally, to manufacture a frame for a motorcycle, the front half of the frame that supports the engine, etc., and the back half of the frame that supports the seat, etc. are assembled by welding separately, and then these front half and rear half are welded together. I try to use it as a frame.

By the way, various tubes are welded in assembling each of the front and rear halves, and it is inevitable that some dimensional errors will occur in the completed halves or halves. However, when welding the front half and the second half that have dimensional errors, for example, the main tube that makes up the first half has a /-trail that makes up the second half, and the Leroy tube that makes up the first half has a subtube that makes up the second half. When welding the two tubes together, if there is a dimensional error, one tube will protrude from the other, making the welding process extremely difficult.

The present invention has been made to improve this disadvantage, and provides a frame structure for a motorcycle in which the front half and the rear half of the frame can be easily welded when manufacturing the frame of the motorcycle. With the goal.

In order to achieve such an object, the present invention makes the tubes constituting the rear half of the frame of a motorcycle square, the tubes constituting the front half of the frame square, and the width of the rear half of the frame is made smaller than the width of the front half. The gist is:

An example of the implementation of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side view of a motorcycle to which the frame structure according to the present invention is applied. The frame of the motorcycle 1 is made by welding a frame front half body 2 and a frame half body 3, and the front half body 2 is made up of left and right members. The left side member shown in FIG. 1 consists of a main tube 5 that extends in a straight line from the top of the head tube 4 rearward and downward when viewed from the side, and a main tube 5 that extends rearward and downward from the bottom of the head tube 4 in a straight line when viewed from the side. It consists of an extended down tube 6 and a curved lower tube 7 welded to connect the main tube 5 and down tube 6.

A side V-shaped water-cooled engine 8 is supported on the front half of the frame, and an upper radiator 9 is attached to the upper part of the down tube 6, and a lower radiator 10 is attached from the lower part of the down tube 6 to the front of the lower tube 7. ing. The upper bridge 11 and lower bridge 12 are still attached to the head tube 4, the front fork 13 is inserted into these upper and lower bridges 1L12, and the front wheel 14 is rotatably supported by the lower end of the front fork 13. There is. Further, a handle 15 for steering the front wheels 14 is provided on the upper brinnon 11, and rearview mirrors 16 and 16 are attached to the left and right sides of this handle 15. In front of the handle 15, a fairing 17 whose base is supported by the upper part of the front half body 2 of the frame is located.

Furthermore, a bracket 20 provided with a pivot 19 for pivoting the front end of the rear fork 18 is welded to the rear of the lower tube 7, and the rear wheel 2.1 is rotatably supported at the rear end of the rear fork 18. There is. A muffler 22 connected to an exhaust pipe from the engine 7 extends to the side of the rear fork 18.

On the other hand, the frame rear half body 3 consists of a seat rail 23 extending rearward from the middle part of the main tube 5, and a sub tube 24 installed diagonally between the rear part of the seat rail 23 and the lower tube 1. rail 23,
A pair of left and right subtubes 24 are provided. Then, the fuel tank 25 is placed across the front part of the seat rail 23 and the upper half of the main tube 5, the fuel tank ender 26 and the rear cowl 27 are attached to the rear part of the seat rail 23, and the fuel tank 25 is placed on the seat rail 23 behind the fuel tank 25. is sheet 28
is installed. Further, an air cleaner, a battery, etc. are housed and supported in the space surrounded by the seat rail 23, sub tube 24, main tube 5, and lower tube 7, and the outside thereof is covered by a side cowl 29.

Next, the frame structure, which is the gist of the present invention, is shown in Figures 2 to 8.
This will be explained in detail based on the diagram. Figure 2 is a side view showing the left side member of the frame, Figure 3 is a plan view of the rear half of the frame, Figure 4 is a rear view of the rear half of the frame, and Figures 5 and 6 are enlarged views of the main parts of the rear half of the frame. It is a diagram.

The frame of the front half body 2 is constructed by welding the rear upper end of the lower tube 7 to the rear end of the main tube 5, and then welding the front end of the lower tube 7 to the lower end of the down tube 6. In .6.7, a flat material is press-formed to have a rectangular cross section, and the butted ends are welded to form a hollow tube. By arranging each tube so that the welded beat is on the inside, we aim to improve the appearance, and by assembling it vertically, we increase the rigidity against vertical vibrations and forces acting in the front and rear directions. That's what I do.

Then, the front end of the hollow tension member 30 is attached to the upper end of the down tube 6, and the tension member 3
0 is welded to the middle part of the main tube 5, and the welded part 31 between the main tube 5 and the lower tube 7 is welded to the middle part of the main tube 5.
A support bracket 32 for supporting the upper part of the engine is provided on the main tube 5 in front of the engine. A collar 31a for supporting the engine mantle is passed through the welded portion 31.

The left side member of the down tube 6 and lower tube 7 is still a split type, and the divided parts 6a and 7a are removable.When removing the engine, the lower half of the down tube 6 and the lower tube 7 are separated. This can be done by removing the front half of the down tube 6, and there is also a support bracket 3 at the bottom of the down tube 6 that supports the front part of the engine.
4, and a support bracket 35 for supporting the rear lower part of the engine is attached to the rear part of the lower F-tube 7, respectively.

On the other hand, as shown in Fig. 8, for the right side member of the front half of the frame 2, both the down tube 6 and the lower tube 7 are not removable, but the down tube 6 and the lower tube 7 are separate parts and are welded together. . A support bracket 34 for supporting the front portion of the engine is attached to the down tube 6 above the welded portion 33 between the down tube 6 and the lower tube 7.

Then, the front end of the main tube 5 and the down f j-
- Attach the upper end of the flap 5 to the head tube 3 by welding,
Additionally, gusset plates 36 and 37 are welded to this mounting portion to strengthen the area around the head tube 3. Furthermore, a first cross pipe 39 with a plate 38 provided between the rear upper parts of the left and right lower tubes 7 is constructed, and the seat rails 23 and sub tubes constituting the rear half body 3 of the left and right lower tubes 7 are also installed. 24 has a vertically elongated rectangular cross section like the tubes 5, 6.7 constituting the front half body 2 of the frame, and the seat rail 23, sub tube 2
4, the width of both of which is narrower than the main tube 5 and the lower tube 7, and the seat rail 23 is small.
the front end of the main tube 5, and the sub tube 24
Even if there is some dimensional error when welding the lower end of the to the lower tube 7, it will not protrude.

In addition, the left and right seat rails 23 are bent inward at their intermediate portions to conform to the shape of the seat 28, and their tips are widened into a flat shape, and between the rear portions of the seat rails 23 and at the intermediate portions. A cross plate 41, 42 is welded between the seats, and a support bracket 43 for mounting a cushion unit is provided between the bent portions 23a of the seat rail 23. A fourth cross pipe 44.45 is installed.

3 above. The installation of the 4th cross pipe 44.45 is the 5th.
As shown in FIG. 7, the intermediate member 46, 46' has a concave cross section.
After fitting into the bent portion 23a from below or from the inside and positioning it by spot welding, the tip of the U-shape is arc welded a, and the weld bead 47 on the inside of the seat rail 23 is welded by this intermediate member 46, 46'. cover. Then, the ends of the cross pipes 44 and 45 are butted against the intermediate member 46 and welded all around. By doing this, the weld bead 47 of the seat rail 23 and the weld bead of the cross pipe do not overlap when welding the cross 9 and the eaves 44 and 45. By providing an air gap S between the seat rail 23 and the intermediate member 46' as shown in FIG. 7, heat can be effectively dissipated during welding.

The welding order of the frame rear half body 3 is that first the upper end of the subtube 24 is welded to the rear lower surface of the seat rail 23, and then the upper end of the tension member 48, which has been attached to the subtube 24 in advance, is welded to the seat rail 23. Weld. After this, the cross plates 41 and 42 are welded between the left and right seat rails 23 in order from the rear and the bead direction is from front to back, and then the cross pipes 44 and 45 are welded to the intermediate member 46 attached to the seat rail 23. By doing this, the second half of the frame 3 is completed. Note that the intermediate member may be welded to the cross pipe first.

Next, the frame rear half body 3 is welded to the frame front half body 2, and the order is that the seat rail 2 is first welded to the frame front half body 2.
As shown in FIG. 6, the front end of the seat rail 23 is butted against the upper surface of the middle part of the main tube 5, and the width Ll of the front end trail 23 is made smaller than the width L2 of the main tube 5. Even if the seat rail is deformed by the heat of welding at a bent part, the seat rail 23 will not protrude from the main tube 5. Next, the lower end of the subtube 24 is welded to the rear surface of the lower tube 1. In this case as well, since the width of the subtube 24 is smaller than the width of the lower tube 7, the subtube 24 does not protrude from the lower tube 1.

After that, the upper end of the plate 38 is connected to the third cross pipe 44.
Complete the production of the motorcycle frame by welding the front and rear edges of the frame.

As explained above, according to the present invention, the width of the seat rail, sub tube, etc. that constitutes the rear half of the frame is made smaller than the width of the main tube, lower tube, etc. that constitutes the front half of the frame to which these are welded. Therefore, when welding the rear half of the frame to the front half of the frame, even if there is some dimensional error, the seat rail or sub tube will not protrude from the main tube or lower tube, etc., and the welding work can be performed reliably and safely. It is extremely easy to perform and has many effects.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is a side view of a motorcycle to which the frame structure according to the present invention is applied, FIG. 2 is a side view of the left side member of the frame, and FIG. FIG. 4 is a plan view of the frame, FIG. 4 is an enlarged view of the main part of the rear half of the frame, and FIG. 8 is a side view of the right side member of the frame. In the drawing, 2 is the front half of the frame, 3 is the back half of the frame, 4 is the head tube, 5 is the main tube, 6 is the down tube, γ is the lower tube, 8 is the engine, 23 is the seat rail, and 24 is the sub tube. , 28 are sheets. Patent applicant Honda Motor Co., Ltd. agent Patent attorney 2 1) Production department Patent attorney Kuni Ohashi Production volume Patent attorney Yu Koyama

Claims (1)

[Claims] In a motorcycle frame in which a seat rail constituting the rear half of the frame is welded to the upper surface of the front half of the frame that supports the engine, the front half and the rear half of the frame are constituted by a square/two-beam structure, and the seat rail is The middle part of the left and right spiders is bent inward to match the seat shape, and the black ζ-ib is welded between these bent parts, and then A frame structure of a motorcycle, characterized in that d is smaller than the angle d] of the corner and crossbeam forming the front half of the frame.