JPS60261786A - Frame body for two-wheel barrow - 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 frame body for a two-wheeled vehicle, the frame of which is constituted by a pipe member, and a part of which has a bracket 1' for supporting a rear suspension.

``Prior Art'' As shown in FIG. 5, a conventional two-wheeled military frame body includes a bracket l for supporting one end of a rear suspension 3 at the rear end of a main pipe 2 extending rearward from a head pipe I. Mounted configurations are known. This bracket 4 is attached by welding to a curved surface near the rear end of the main pipe 2, as shown in Figure 1.

The frame body includes the head pipe 1, the main pipe 2, the down tube 5, the lower vibro,
Front stay 7, center pipe 8. A complete framework is constituted by the seat pipe 9, the pack pipe LO, etc., and the seat pipe 9 and the back pipe IO are both connected to connecting pins 9a and 1. are removably bonded via Q a f<.

It is structured so that it can be divided from there. In the figure, the reference numeral ``l'' indicates a rear fork of the rear wheel W, and L2 indicates a link supporting the other end of the rear suspension 3.

``Problems to be Solved by the Invention'' By the way, in such a frame body, stress due to the load of the fence acts on the safe and in some parts, so it is required to have sufficient strength to withstand this stress. . In the register,
Since the bracket 4 as shown in FIG. 4. Sufficient measures are desired from the viewpoint of the mounting structure for the main pipe 2 and its strength. On the other hand, it goes without saying that consideration must be given to reducing the overall weight of the frame body and ease of manufacture.

However, in the conventional frame body, the bracket 4 is attached to the main frame 2 by being directly welded to a part of the circumferential surface of the main frame 2. (Rotated) Yo, there are six.

aspect. -sK concentration is effective.

Therefore, it became necessary to increase the wall thickness of the entire main pipe in advance, and as a result, there was a problem that the amount of electricity in the frame body increased. Since the IL main pipe 2 is usually made of a round pipe and has a curved surface, a structure in which the bracket is attached only by welding to such a curved surface has problems in that it is not easy to manufacture and requires skill.

"Means for Solving the Problem" The present invention provides a frame body for a two-wheeled vehicle in which a bracket for supporting the -i of the rear suspension is attached by welding to the rear end of the main pipe extending rearward from the head pipe. , a patch plate covering the rear end surface of the main pipe is attached to the main pipe by welding, and the bracket is attached to the main pipe.

It was attached by welding to both the surface of the caul plate and the curve of the main pipe.

"Function" According to the above means, the backing plate that covers the rear end surface of the main pipe exerts a function of preventing deformation of the cross-sectional shape of the rear southern part of the main pipe, that is, a reinforcing function. moreover,
Is the front side of this backing plate part of the bracket? : In addition to being able to be used as a welding surface, the surface of this bracket is flat, so it has the effect of facilitating the welding work of the bracket.

``Example'' This example shows an example in which a seat vibrator 9 is applied to a detachable so-called minute 1ll type frame body, which is similar to the conventional example shown in FIG. 5. A side view of the entire body is shown.

In this embodiment, the parts basically common to those of the conventional example shown in FIG. 5 are given the same reference numerals to simplify the explanation thereof.

In the embodiment, as shown in detail in FIGS. 1 to 3, the main pipe 2 extending rearward from the head pipe 1 is provided with an abutment that covers the rear end surface of the main pipe 2. The plate 2o is attached so that it is in contact with the entire circumference. A bracket 30 for supporting one end of the rear suspension 3 is attached as shown in the figure (the above-mentioned abutment 20
It is attached in contact with both the 0 surface and the main pipe 20 surface. That is, the bracket 30 has a pair of opposing side plate portions 31 and 31 when viewed from the rear end side of the main pipe 2, as shown in FIG. A lower contact edge 3L is formed in a channel shape with i′, and is provided at the lower edge portions of the side plate portions 31 and 31, and is in contact with the surface of the backing plate 200, respectively.
a, 3La, and upper abutting edges 31b, 31b that respectively abut on the upper circumferential surface of the main pipe 20, and these abutting edges are attached by fillet welding.

Here, the rear end surface of the main pipe 2 has a shape that is inclined with respect to the axis of the main pipe 2 so that its outline forms an ellipse. Therefore, the backing plate 20 also has an elliptical shape that merges with the outline of the rear end surface. It is formed into a plate shape. In addition, a cylindrical member 22 that forms a bolt hole for attaching to the main pipe 2 near the rear end surface (in the seat vibe 9?pol) 21 extends in the left and right direction of the frame body. installed. A part of the outer circumferential surface of the cylindrical member 22 extends slightly beyond the rear end surface of the main pipe 2, so that the backing plate 20 has a curved inner arc shape in cross section corresponding to the exposed part. A curved portion 20a is formed. The inner surface of this curved portion 20a is in contact with the repaired portion, so that the cylindrical member 22 is held down by the stopper 20. The thickness of the backing plate 20 is preferably thicker than the wall thickness of the main frame 2 in order to provide the backing plate 20 with a reinforcing effect for the main frame 2.

According to the configuration of the above embodiment, the load acting on the main pipe 2 from the rear suspension 3 through the bracket 30 is distributed t' between the peripheral surface of the main pipe 2 and the backing plate 20. (in addition, stress is not concentrated on a part of the main pipe 20).
is reinforced by the backing plate 20 to maintain its cross-sectional shape, resulting in a structure with sufficient strength. Therefore, the wall thickness of the main pipe 2 can be made 7 times thinner, thereby reducing the weight. In addition, by storing the temporary contact 20, its surface can be used as a part of the bracket 30 to be welded.Furthermore, since the surface of the bracket 200 is flat [fi″r: (The welding work of the bracket 20 can be easily carried out without the need for a.

Since it is pressed from the outside by the stopper 20, the strength of the attachment portion of the seat pipe 9 is also improved.

"Effects of the Invention" In the present invention, a backing plate that covers the rear end surface of the main pipe is welded to the main pipe, and a bracket Y for supporting the rear suspension is attached to the front surface of the backing plate and the circumferential surface of the main pipe. Since it is attached by welding to both sides, the load acting on the main pipe with the two-way valve is dispersed, eliminating stress concentration, and the first main pipe is also effectively reinforced by the patch plate. It is no longer necessary to increase the wall thickness of the main pipe in advance, thereby reducing the weight of the frame body, and by providing the backing plate 20, the surface can be used to accommodate the bracket. In addition to being usable as a surface, since the surface of the backing plate 20 is flat, the welding work of the bracket is facilitated, resulting in excellent young fruit production, such as improved manufacturability.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the invention, Figure 1 is an enlarged perspective view of the part indicated by the mark in Figure 4, Figure 2 is a view in the direction of arrow A in Figure 1, and Figure 3. is the 1ll-ffl@@ direction diagram in Figure 1,
FIG. 4 is a side view of the metal seat of the frame body, and FIG. 5 is an overall side view of the conventional frame body. l...Head pipe, 2...Main pipe, 3...
・Rear suspension, 20-...This-1:. 30...Bracket, 31°...Side plate part, 3La...
- Lower contact edge, 31b...upper contact line. Applicant Honda Motor Co., Ltd. Closed Company

Claims (1)

[Claims] A 9fi rear suspension is installed at the rear end of the main pipe that extends rearward from the head pipe! 'a' In a frame body for a two-wheeled vehicle to which a bracket for supporting T is attached by welding, a temporary fiI is attached to the main pipe to cover the rear end l11 of the main pipe: Attached by welding, the bracket is attached to the backing plate Frame body for two-wheeled vehicles characterized by welding and fitting both the surface and the side of the main pipe.