JPS6012271B2 - Pivot part of rotating parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a pivot part of a rotating part, and in particular to the structure of a pivot part that passes through a rotating part such as a rear arm, main stand, brake pedal, etc. of a motorcycle.

For rotating parts such as the rear arm of a motorcycle, main stand, brake pedal, etc.,
The pivot part was made of mechanical structural carbon steel pipes or steel cut into a pipe shape.

However, carbon steel pipes for machine structures are expensive, and those processed from camphor steel have the disadvantage of being slow to produce and expensive. The purpose of the present invention is to eliminate such drawbacks, and its features include forming a pivot portion by simply wrapping a sheet metal, and welding the arm portion to the pivot portion by straddling the abutting portion. Accordingly, it is an object of the present invention to provide a pivot portion of a rotating component that can ensure sufficient strength without welding the abutting portion itself. That is, according to the present invention, in a rotating component including a pivot portion and an arm portion whose one end is welded to the pivot portion, the pivot portion is formed by winding a sheet metal into a cylindrical shape, and the pivot portion is There is provided a pivot portion of a rotating component, characterized in that the arm portion is welded to the pivot portion across the abutting portion.

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

FIG. 1 is a diagram showing a pivot part of the rotating part of the present invention. The pivot part 12 is made by winding and forming a sheet metal into a cylindrical shape, and one end of the arm part 16 is straddled over the abutting part of the pivot part. is welded.

Therefore, even if the abutting portions 14 themselves are not completely joined by welding, the abutting portions are connected to each other by the arm portions 16 and the same strength as a steel pipe can be maintained. The abutting portion 14 will not be expanded and deformed even by the force applied thereto. FIG. 2 is a diagram showing a case where the structure of the pivot portion according to the present invention is adopted in the rear arm of a motorcycle.

The rear arm has left and right pivot parts li6, 18,
Each pivot part has a steel pipe arm 2 corresponding to the arm part.
One end (tip) of 0.20 is force welded. The left and right arms are connected by a connecting member 22, and rear axle mounting holes 24, 24 and reaction mounting bottles 26, 26 are provided at the rear end of each arm. Each of the pivot parts 18, 18 is made by winding and forming a sheet metal into a cylindrical shape, and the abutting parts 28, 2 are located at the rear, and each arm 20, 20 straddles the abutting part. Welded to the pivot part of the

Therefore, each pivot 18, 18 has sufficient strength and can function as a completely continuous pipe without welding the abutting portions 28, 28 themselves. That is,
The pivot portions 8 and 18 of the rear arm have the function of transmitting rotational movement when the rear wheel moves up and down and the driving force or braking force generated in the rear wheel to the vehicle body. Even in this case, the butt portions 28, 28 do not widen or deform, and can exhibit the same strength as a conventional continuous pipe.

FIG. 3 is a diagram showing a case where the structure of the pivot portion according to the present invention is adopted in the main stand of a motorcycle.

The main stand has a pivot portion 30 that is attached to the vehicle body, and the pivot portion has both leg portions 32, 3 corresponding to the arm portions.
2 is welded. The left and right legs are connected by a connecting part 34' to a pivot part 38', to which a stopper member 36 is welded to come into contact with the vehicle body frame and support the weight when the main stand is erected. The pivot portion 38 is made by winding and forming a sheet metal into a cylindrical shape as in the examples shown in FIG. 2 and FIG. It is welded to the part.

Therefore, even without welding the abutment part 38 itself, the three pivot parts are connected by the respective legs 32, 32 and are given the same strength as a complete pipe. Even if the abutting portion 38 is acted on, deformation such as expansion of the abutment portion 38 is reliably prevented. Fig. 4 is a diagram showing a case where the structure of the pivot portion according to the present invention is applied to a brake pedal of a motorcycle.

The brake pedal has a pivot portion 40 rotatably attached to a shaft, and a base end portion of a pedal body 42 corresponding to the arm portion is welded to the pivot portion. A step portion 44 is welded to the tip of the pedal body, and a lever 46 to which a wire or rod for braking operation is connected is welded to a portion spanning the pivot portion 40 and the base end of the pedal body 42. In the case of the brake pedal as well, the pivot portion is formed by rolling a sheet metal into a cylindrical shape, and the pedal body 42 is welded across the abutting portion 48 of the pivot portion.

Therefore, even without welding the butt portion 48 itself, the pivot portion 40' is connected by the pedal body 42, providing strength comparable to that of a complete pipe. That is, it is possible to prevent the abutting portion 48 from expanding or otherwise deforming even if a braking operation force is repeatedly applied by stepping on the foot. Since the pivot part of the rotating component according to the present invention has the configuration described above, the pivot part can be manufactured by a simple process of simply winding a sheet metal, and the abutting part itself does not need to be welded. Deformation such as expansion of the abutting portion can be prevented by the arm portion welded to the abutting portion.

Therefore, costs can be reduced compared to those using conventional structural steel pipes or those machined from cast steel. Moreover, in terms of strength, there is almost no difference from the conventional one, and there are no practical problems.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a pivot part of a rotating part according to the present invention, FIG. 2 is a perspective view of a rear arm of a motorcycle in which the pivot part is made of bran according to the present invention, and FIG. 3 is a perspective view showing a pivot part according to the present invention. FIG. 4 is a perspective view of a brake pedal of a motorcycle in which the pivot portion structure according to the present invention is implemented. In each figure, reference numbers indicate the following parts.
12, 18, 30? 40...Pivot part, 14? 28
, 38, 48... Butt part, 16... Arm part, 20
...Arm (Arm) 32...Arm (leg of main stand), 42...Arm (brake pedal body) shown respectively. Figure 3 Figure 4

Claims (1)

[Claims] 1. In a rotating component including a pivot part and an arm part welded at one end to the pivot part, the pivot part is formed by winding a sheet metal into a cylinder, and the pivot part is straddled over the abutting part of the pivot part. A pivot part of a rotating part, characterized in that an arm part is welded to the pivot part.