JPH0129122Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle wheel mainly applied to motorcycles and other two-wheeled vehicles.

Conventionally, this kind of wheel has a drum a made of a steel plate or other metal plate as shown in FIG.
A spoke plate e made of a steel plate or other metal plate, which is fitted and bound onto the boss d and extends outward in the circumferential direction, is fitted onto the boss d at the center cylindrical shaft-shaped or other shaft hole f. A type is known in which this is provided at least in the middle part of the drum a, overlapped with the outer periphery of the end face of the drum a, and bonded by welding g performed at the inner seam. As shown in Figure 2, a drum a and a spoke plate e are generally overlapped and a part of them is welded g.
is flat or conical, and the distance l to the joints at both ends is relatively small, so that the outward bending stress acting on the intermediate portion h is concentrated on the bent portion j. However, high rigidity of the flange b is required, which is accompanied by inconveniences such as an increase in plate thickness.

Furthermore, it is difficult to process the intermediate portion h of the flange b and the spoke plate e so that they overlap with each other in flat or conical surfaces.

The object of the present invention is to obtain a device free of such inconveniences, and a flange 2 is attached to one end of a drum 1 made of a metal plate via a shoulder 9 bent inward.
A cylindrical shaft 3 is provided in the center of the cylindrical shaft 3, which is fitted and fixed to the boss 4. A shaft hole 6 is provided in the center of a spoke plate 5 made of a metal plate, which is fitted and fixed to the boss 4. 2 and a spoke plate 5 are overlapped and welded, the shoulder portion 9 of the drum 1 is formed into an arcuate surface, and the flange 2 is curved to bulge toward the spoke plate 5 side with a radius of curvature larger than the shoulder portion. An annular convex portion 10 is formed on the surface and protrudes toward the drum 1 at the intermediate portion of the spoke plate 5.
It is characterized in that the inner diameter side of the convex portion 10 is circumscribed to the shoulder portion 9 of the drum 1, and the convex portion 10 and the drum 1 are welded 7 to connect the drum 1 and the spoke plate 5.

FIG. 3 shows one example of this, in which the shaft hole 6 is formed into a cylindrical shaft shape with a bent flange 11 at the inner peripheral edge. In the drawing, 12 indicates a rim on the outer periphery of the spoke plate 5, and 13 indicates a tire on the outer periphery.

To explain its operation, a welding point 7 between the drum 1 and the spoke plate 5 is formed in the intermediate portion 8, and the inner peripheral edge of the welding point 7 is fixed onto the boss 4, so that the flange 2 has a sufficient length L. Furthermore, the intermediate portion 8 has a convex portion 10 in advance, and the seam formed between the inner side thereof and the outer periphery of the end surface of the drum 1 is, for example, a convex portion 10. As clearly shown in Figure 4, the angle α is relatively large, thus making it easier to position the welding torch during welding work, and making the end face of the overlay of the weld 7 substantially flat, improving weldability. Furthermore, the outward bending stress acting on the plate 5 is dispersed from the weld 7 portion to the outer circumferential side thereof, and thus the weld strength is increased compared to a case where the stress is concentrated.

In this way, according to the present invention, the shoulder portion 9 of the flange 2 bent at one end of the brake drum 1 is formed into an arc surface that circumscribes the inner diameter side of the convex portion 10 at the intermediate portion of the spoke plate 5, and the shoulder portion 9 of the flange 2 is bent at one end of the brake drum 1. Since the flange 2 bent at one end is formed into a curved surface that bulges toward the spoke plate 5 side and has a radius of curvature larger than the arc surface of the shoulder portion 9, the flange 2 has a distance between the fixed portions at both ends of the flange 2. is large, and therefore the supporting force against the bending moment applied to the spoke plate 5 is small, so the flange 2
It is possible to increase the rigidity of the flange 2 without increasing the thickness of the spoke plate 5, contributing to the weight reduction of the wheel, and to prevent stress concentration on the fixed parts at both ends of the spoke plate 5, thereby increasing the strength of the fixed parts. When a bending moment acting on the flange 2 is transmitted to the curved surface of the flange 2 via the annular convex portion 10 and the shoulder 9, the moment acts as a bending force on the curved surface, causing the curved surface to bend slightly. By doing so, it is possible to alleviate the impact and reduce the stress at the joint with the boss 4.

In addition, the flange 2 that bulges out toward the spoke plate 5 side enlarges the internal space of the drum 1, making it easier to store brakes, etc. in the space, and is smoothly curved, making it easy to mold. It has the effect of being able to perform

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of a conventional example, Fig. 2 is an enlarged sectional view of its main parts, Fig. 3 is a cutaway side view of an example of the proposed wheel, and Fig. 4 is an enlarged sectional view of its main parts. . 1...Drum, 2...Flange, 3...Cylinder shaft,
4... Boss, 5... Spoke plate, 6... Shaft hole, 7... Welding, 8... Middle part, 9... Shoulder part, 1
0...Protrusion.

Claims (1)

[Scope of utility model registration request] A flange 2 is connected to one end of a drum 1 made of a metal plate via a shoulder part 9 bent inward, and a cylindrical shaft 3 is provided at the center of the flange 2, which is fitted and fixed to a boss 4, and a spoke plate made of a metal plate. In a vehicle wheel in which a shaft hole 6 is provided at the center of the drum 1, the shoulder 9 of the drum 1 is formed into an arcuate surface, and the flange 2 and the spoke plate 5 are overlapped and welded. At the same time, the flange 2 is formed into a curved surface that bulges toward the spoke plate 5 side with a radius of curvature larger than the shoulder portion,
An annular convex portion 10 that protrudes toward the drum 1 is provided at the intermediate portion of the spoke plate 5, the inner diameter side of the convex portion 10 is circumscribed to the shoulder portion 9 of the drum 1, and a weld 7 is attached to the convex portion 10 and the drum 1. A vehicle wheel characterized in that a drum 1 and a spoke plate 5 are combined by applying the same process.