JPH0221961B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an assembly type wheel for a small vehicle such as a motorcycle, and mainly relates to an assembly type wheel intended for weight reduction.

A prefabricated wheel shown in FIG. 3 is known as a wheel for a small vehicle such as a motorcycle. That is, the spoke plate 103 is bonded to the inner circumference of the rim 102 that holds the tire 101 at the outer circumference by press-fitting or the like, and the drum 104 is fitted to the inner circumference of the spoke plate 103 and bonded by welding. Further, a cylindrical boss 105 through which the axle of the vehicle is inserted is fitted and connected to the inner peripheral portion of the drum 104.

By the way, in order to connect the drum 104 and the boss 105, as shown in the figure, the flange 106 constituting the inner periphery of the drum 104 is slightly bent outward from the flange 104 (to the right in the figure), and then the flange 106
The inner circumferential edge 107 of the boss 1 is also formed to protrude slightly outward, and the protruding tip 108 of the inner circumferential edge 107
It was done by welding in 2005. For this reason, a reinforcing member (reinforcement) 109 is attached to the inner surface (left side in the illustration) of the flange 106 of the drum 104.
is welded, and the reinforcement 109 is bent inward of the drum 104 to form a tip 110 of the inner peripheral edge thereof.
had to be welded to the boss 105.

Therefore, since this type of assembly type wheel requires reinforcement 109, it has disadvantages such as being unfavorable in terms of weight reduction, and an improvement is desired.

Therefore, the purpose of the present invention is to reduce the number of components, reduce the number of welding points, and maintain sufficient strength by moving the flange of the drum closer to the center of the wheel (center of gravity) without requiring any reinforcing members that were previously required. , the wheel weight can be reduced, the strength can be improved with a lightweight and simple structure, cost can be reduced and mass production can be achieved, and the flange itself can have a spring effect to absorb shock from the ground. The wall thickness of the hub can be made thinner, making it possible to obtain a wheel that is overall lightweight and with well-balanced rigidity.Furthermore, by suppressing the reduction in wall thickness due to flange processing, it is possible to secure a wide contact area at the joint with the boss, and the connection part It is an object of the present invention to provide an assembly type wheel that can improve strength and ensure sufficient strength against stress concentration as well as spring effect.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
This will be explained in detail based on the figure and FIG. FIG. 1 is a front view of a prefabricated wheel implementing the configuration according to the present invention, and FIG. 2 is a cross-sectional view taken along the line 2--2 in FIG. 1 showing a vertical side view thereof.

As shown in the figure, the tire 1 is fitted and held in the groove-shaped outer circumferential portion 3 of the rim 2, and spoke plates 5 are press-fitted and bonded to the inner circumferential portion 4 of the rim 2. In the embodiment, the spoke plates 5 are radially arranged 3
The spoke portions 6 extend and expand, and the spoke portions 6
... are integrated at the inner circumferential portion 7, and each is provided with a window 8 for weight reduction, etc., and the three spoke portions 6
The outer circumferential portion 9 formed by... is bent 9a parallel to the axle of the vehicle, and the bent portion 9a is force-fitted and press-fitted into the inner circumferential surface 4a of the center portion of the rim 2 parallel to the bent portion 9a, and then spot welded. The spoke plate 5 and the rim 2 are bonded together.

A drum 10 is fitted and connected to the inner peripheral portion 7 of the spoke plate 5. The drum 10 surrounds a flange 11 in the inner diameter direction, and the flange 1
1 divides the drum 10 into an inner side (left side of the flange 11 in FIG. 2) and an outer side (right side of the flange 11 in FIG. Inner peripheral part 7 of 5
The drum 10 and the spoke plate 5 are fitted into a cylindrical shape and welded to connect the drum 10 and the spoke plate 5.

By the way, in the present invention, the flange 11 of the drum 10
is bent 14 inward of the drum 10 (left side in FIG. 2), and the drum 1 is bent in this way.
Inner peripheral edge 1 of flange 11 bent inwardly at 0
5 is formed into a cylindrical shape. In detail, the above flange 11
When forming the bend 14, the flange 11 is attached to the drum 1.
The shoulder portion 16, which is a continuous portion between the body portion 12 and the flange 11, is bent with the minimum radius of curvature that can be processed, that is, with a large curvature. is forming.

As described above, a cylindrical boss 18 having a certain length is fitted to the inner peripheral part 17 of the drum 10, which is constituted by the cylindrical inner peripheral edge 15 of the flange 11 which is bent 14 inwardly of the drum 10, Both 10 and 18 are bonded together by welding, which will be described later.

That is, the inward bending 1 of the flange 11 of the drum 10
4 and by further inwardly cylindricalizing the inner peripheral edge 15, the flange 11 is moved closer to the wheel center (center of gravity) so that it approximately coincides with the center line l as shown in the figure, in other words, the inside of the drum 10 is The peripheral part 17 is aligned with the center line l above.
The cylindrical inner peripheral edge 15 is aligned with the boss 1.
8, thereby fitting and bonding the boss 18 to the inner peripheral portion 17 of the drum 10.

The wheel according to the present invention assembled as described above has a flange 1 of the drum 10 constituting the wheel.
1 bends 14 inward of this 10 and approaches the center line of the wheel, so the shape of the bend 14 causes the boss 18
It is possible to reduce the bending moment applied to the connecting portion between the drum 10 and the flange 11, thereby making it possible to have sufficient strength in the flange 11, and in particular, there is no need for reinforcement members (reinforcement) as in the past. , it is possible to reliably achieve reduction in wheel weight. Moreover, since the drum 10 is made of a single plate, the number of components can be reduced and the number of welding points can be reduced, resulting in excellent mass productivity.

In addition, since there is no need to weld reinforcement to the flange 11 of the drum 10 from the side, there is no heat influence on the inner diameter of the drum 10, and the drum 1
It is also possible to improve the accuracy of the zero inner diameter. Drum 10
If the shoulder portion 16 of
The shoulder portion 16 can be provided with sufficient strength to withstand the stress relatively concentrated on the shoulder portion 6, and
Thermal effects such as thermal distortion on the drum 10 caused by the welding of the drum 10 and the spoke plate 5 can be minimized, and in combination with the above, this contributes to improving the accuracy of the drum 10.

Furthermore, if the flange 11 bent inwardly of the drum 10 is formed into a smooth curved shape that slightly bulges outward of the drum 10, stress concentration on the flange 11 can be prevented.

By the way, if the drum 10 and the boss 18 are welded in the following manner, sufficient rigidity can be ensured at the joint between the two 10 and 18.

That is, the cylindrical inner peripheral edge 1 of the flange 11 of the drum 10
Both the front portion 15a (left side in FIG. 2) and the rear portion 15b (right side in FIG. 2) of the boss 18 are welded to the outer peripheral portion 19 of the boss 18. As a result, the cylindrical inner circumferential edge 15, which is tapered due to processing, is bonded to the outer circumferential portion 19 of the boss 18 at both its tip 15a and rear portion 15b, so that the bonded portion has rigidity. This means that the company will have a sufficient amount of That is, it is possible to improve the strength despite the lightweight and simple structure.

In particular, a flange 11 formed around the inner diameter of the drum 10 made of a single plate is bent inward from the drum outer circumference 13 and has a curved shape that swells outward from the drum 10. 11 is formed into a cylindrical part 15 which bends inwardly with a large curvature of the drum 10, and the cylindrical part 15 is formed into a boss 1 near the center of the wheel.
By fitting and welding 8, the flange 1 itself has a spring effect and can absorb shock from the ground.This reduces the rigidity of the spoke plate 5 connected to the drum outer periphery 13 and increases the wall thickness. can be made thinner. Therefore, it is lightweight overall,
A wheel with balanced rigidity can be obtained.

Moreover, the flange 11 of the drum 10 is bent inward from the outer peripheral portion 13 of the drum 10 so that the flange 11 of the drum 10 is
0 It has a curved shape that swells outward, and the drum 1
0 Since the cylindrical part 15 of the inner circumferential edge that bends inward with a large curvature is welded to the boss 18, the shape after press forming only suppresses the decrease in wall thickness due to processing of the flange 11 that joins with the boss 18. In addition, it is possible to secure a wide contact area at the joint portion, and the strength of the connection portion can be improved. Furthermore, since the drum 10 is made of a single plate and has a spring effect, sufficient strength can be ensured even if stress concentration occurs.

As described above, according to the present invention, in a prefabricated wheel consisting of a rim, spoke plate, drum, and boss, the number of component parts can be reduced and welded by using a single drum without requiring any reinforcing members, which were conventionally required. In addition to reducing the number of points, the flange can be brought closer to the center of the wheel (center of gravity) to ensure that the flange has sufficient strength, reducing the weight of the wheel. Moreover, it is lightweight and simple. Despite the structure, it is possible to achieve an improvement in strength, which in turn can exhibit advantages such as contributing to cost reduction and mass production.

In particular, a flange formed around the inner diameter of the drum made of a single plate is bent inward from the outer periphery of the drum and has a curved shape that bulges outward of the drum. Since the cylindrical part, which is bent inward from the drum due to its curvature, is fitted and welded to the boss near the center of the wheel, the flange itself has a spring effect, absorbing shock from the ground, and this allows the outer circumference of the drum to It is possible to reduce the stiffness of the spoke plate that connects to the spoke plate and reduce the wall thickness. Therefore, it is possible to obtain a wheel that is overall lightweight and has well-balanced rigidity.

In addition, the flange of the drum has a curved surface shape that is bent inward from the outer circumference of the drum and bulges outward, and is welded to the boss at the cylindrical portion of the inner circumference that bends inward to the drum with a large curvature. Therefore, the shape after press working not only suppresses the reduction in wall thickness due to processing of the flange that joins the boss, but also ensures a wide contact area at the joint, which improves the strength of the connection part. Furthermore, since the drum is made of a single plate and has a spring effect, sufficient strength can be ensured even when stress concentration occurs.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, in which FIG. 1 is a front view of an assembly type wheel, FIG. 2 is a sectional view taken along the line 2-2 in FIG. Third
The figure is a vertical side view of a conventional assembly type wheel. In the drawings, 1 is a tire, 2 is a rim, 3 is its outer periphery, 4 is its inner periphery, 5 is a spoke plate, 7 is its inner periphery, 10 is a drum, 11 is a flange, 1
5 is a cylindrical portion, 17 is an inner peripheral portion of the drum, and 18 is a boss.

Claims (1)

[Claims] 1. A rim 2 that holds the tire 1 at the outer circumference 3, and a spoke plate 5 that is attached to the inner circumference 4 of the rim 2.
, a drum 10 that is fitted and connected to the inner peripheral part 7 of the spoke plate 5, and a boss 18 that is fitted and connected to the inner peripheral part 17 of the drum 10, the drum 10 is made of a single plate, and surrounds a flange 11 in the inner diameter direction from the outer circumferential portion 13 of the drum 10, and bends the flange 11 inward from the drum outer circumferential portion 13. The inner peripheral edge of the flange 11 is formed into a curved shape that swells outwardly, and the inner peripheral edge of the flange 11 is
The cylindrical part 15 is bent inwardly with a large curvature.
An assembly type wheel characterized in that: the cylindrical portion 15 is fitted and welded to the boss 18 near the center of the wheel.