JPH0522401Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a vehicle wheel that has a hub, a rim, and spokes integrally molded to increase its rigidity and reduce its weight.

"Prior Art" Conventionally, measures have been taken to increase the rigidity and reduce the weight of vehicle wheels.
This is shown in Publication No. 164801.

This vehicle wheel is a wheel whose rim, spokes, and hub are integrally cast from light alloy.
A hole is provided from the rim to the spoke part, and a part of the spoke part is formed hollow.By forming the hollow part in the spoke part, it is lighter and stronger than the conventional solid spoke part. In addition, by communicating the holes from the rim to the spokes with the inside of the tire, the amount of air sealed in the tire can be increased, making it possible to improve the tire's cushioning performance.

``Problem to be solved by the invention'' However, in the conventional vehicle wheels described above, the hollow cylindrical spokes are integrally formed with the rim, and although the cushioning performance of the tire is improved, the amount of air in the tire is As the amount of tire deformation increases, the amount of deformation of the tire increases. Therefore, if you install a tire used on a general wheel with solid spokes on the conventional wheel mentioned above and try to obtain the same tire contact surface as when installing it on a general wheel, you will have to increase the air pressure. There are some inconveniences that cannot be avoided.

In addition, the area of the inner wall surface on the foil side that seals the air inside the tire is increased, and in order to maintain airtightness,
In particular, it is necessary to increase the wall thickness, including the spoke parts.
The drawback was that the weight of the wheel increased.

Therefore, in the past, it has been desired to deal with the above-mentioned problems, and the present invention is intended to solve the remaining problems in the conventional technology.

"Means for Solving the Problems" The present invention aims to provide a vehicle wheel that can effectively solve the above-mentioned problems, and this vehicle wheel includes a hub in which an axle mounting hole is formed,
A rim on which the tire is mounted and a plurality of spoke parts connecting the rim and the hub are integrally molded, the hub is formed in a hollow cylinder shape centered on the axle, and the spoke parts are formed in a cylindrical shape. and one end is connected to the outer peripheral surface of the hub and arranged radially around the axle, the rim is formed in an annular shape with the other end of the spoke part joined to the inner surface of the rim, One end of the cylindrical spoke part is integrally formed so that the inside of the spoke part and the inside of the hollow cylindrical hub are continuous and form a hollow part, and the other end part of the cylindrical spoke part is The end portion is closed and integrally formed with the rim.

"Operation" In the vehicle wheel according to the present invention, the cylindrical spoke part and the hollow cylindrical hub are joined so that the inside thereof forms a continuous hollow part, so that when the wheel is cast, , each spoke part can be formed into a cylindrical shape with one core. Furthermore, this vehicle wheel can be lightweight and highly rigid due to the hollow cylindrical hub, cylindrical spokes, and rim that are integrally molded, and
Since the other end of the spoke part is closed by the rim, there is no need to increase the air capacity inside the tire.
There is no need to consider the airtightness of the spokes.

``Example'' Hereinafter, one example of the present invention will be described as a first example based on the drawings.
This will be explained based on the diagram and FIG.

In FIGS. 1 and 2, the symbol W indicates a vehicle wheel according to this embodiment, and this vehicle wheel W has a hub 1, spoke portions 2... and a rim 3 made of lightweight aluminum alloy or the like. It is made of an alloy and is integrally cast.

The hub 1 has an axle mounting hole 1a formed in its center, and a hollow portion 4a that is hollow inside and communicates with the axle mounting hole 1a.

A plurality of reinforcing ribs 1b (10 in the figure) are formed on both sides of the hub 1 so as to protrude outward from both sides in the radial direction of the hub 1. has been done. Also, this hub 1
On the outer periphery of the hub 1, there are a plurality of spokes 2 (five in the figure) extending radially outward from the hub 1.
...is formed.

These spoke parts 2... are shown in FIGS. 1 and 2.
As shown in the figure, its appearance is approximately truncated square pyramid-shaped, and its interior is hollow, and its base end on the hub 1 side communicates with a cavity 4a formed in the hub 1, Further, a cylindrical hollow portion 4b whose outer tip portion is closed by the rim 3 is formed, respectively.

Further, the wall thickness of each of these spoke portions 2 along the length direction of the axle mounting hole 1a is substantially uniform, as shown in FIG. 2.

Brake disk attachment holes 5 are formed between adjacent base end portions of these spoke portions 2. In addition, these spoke portions 2...
A rim 3 is formed at the tip of the....

The rim 3 is formed in an annular shape so as to straddle the tips of the spoke portions 2, and as shown in FIG. 2, its cross section is approximately U-shaped for mounting a tire. The inner circumferential surface 3a is formed to close the cylindrical hollow portions 4b of the spoke portions 2 at their tips as described above.

According to such a vehicle wheel W, since the cavity 4b of the spoke part 2 is closed by the rim 3 and communication with the inside of the tire is cut off, the cavity 4 has a sealed structure. It is not necessary and manufacturing control is easy.

Furthermore, since the tip of the cavity 4b is closed by the rim 3, the capacity of the cavity communicating with the inside of the tire is set by the internal shape of the tire and the external shape of the rim 3. As a result, the capacity of the cavity communicating with the inside of the tire is almost uniquely set regardless of the casting accuracy of the hub 1 and the spoke parts 2.

As a result, the casting quality of the spoke portions 2 contributes to improving the quality of the vehicle wheel W, and when the tire is mounted on the vehicle wheel W, the characteristics set for the tire can be reliably obtained.

Further, the spoke portion 2 in which the cylindrical hollow portion 4b is formed has a large section modulus and a substantially uniform wall thickness, so it has excellent rigidity. , since it is communicated with the axle mounting hole 1a through the cavity 4a in the hub 1, the capacity of the cavity formed in the vehicle wheel W as a whole is large, thereby providing high rigidity and A vehicle wheel W that is significantly reduced in weight can be obtained.

Further, the hollow portion 4 formed by the hollow portion 4a of the hub 1 and the cylindrical hollow portions 4b of the spoke portions 2 is approximately star-shaped with the axle mounting hole 1a at its center. .

In such a wheel, the cavity 4 in the hub 1
When forming the cylindrical hollow portions 4b in the spoke portions 2, an integrated star-shaped core can be used, which simplifies the configuration of the casting mold and makes it possible to form the hub. 1. Coupled with the fact that the spoke portions 2... and the rim 3 are integrally molded, manufacturing becomes easy.

In addition, in the above-mentioned embodiment, the reinforcing rib 1b
... are provided so as to protrude outward from both sides of the hub 1, but the invention is not limited to this.
It may also be provided so as to protrude from both side surfaces toward the inner cavity 4a.

"Effects of the Invention" As explained above, the vehicle wheel of this invention can provide the following excellent effects.

a The vehicle wheel of the present invention can use an integrated star-shaped core when forming the hollow part in the hollow cylindrical hub and the cylindrical hollow parts in the spoke parts. This simplifies the construction of the casting mold, and together with the fact that the hub, spokes, and rim are integrally molded, manufacturing becomes easy.

b In addition, since the vehicle wheel of the present invention has a hollow cylindrical hub, the width of the axle support point of the hub can be increased without significantly increasing the weight of the vehicle wheel itself, and the overall width is improved. The rigidity of the vehicle wheel can be increased, and the rigidity of the vehicle wheel can be maintained to a certain extent even if the thickness of the spokes is made thinner, so the vehicle wheel can be made to be highly rigid and lightweight as a whole. It can be done.

c In the vehicle wheel of the present invention, communication between the inside of the cylindrical spoke portion and the inside of the tire is cut off, so that the air capacity of the tire does not increase. In addition, due to the increase in air capacity, the amount of tire deformation does not increase, and the contact surface of the tire can be prevented from changing due to an increase in the amount of tire deformation, so the performance of the tire does not deteriorate. .

That is, since the other end of the spoke part is closed by the rim, the air capacity of the tire is set by the internal shape of the tire and the external shape of the rim, and as a result, the air capacity of the tire is can be set almost uniquely regardless of the casting precision of the hub and spoke parts.
Therefore, when the tire is mounted on a vehicle wheel, the characteristics set for the tire can be reliably obtained.

d In addition, the vehicle rim of the present invention does not need to take into account the airtightness of the cylindrical spokes, and unlike conventional wheels with holes extending from the rim to the spokes, the vehicle rim does not require the spokes to ensure airtightness. Since there is no need to increase the wall thickness of the wheel, the wheel can be made lighter.

e Furthermore, since there is no need to consider the airtightness of the cylindrical hollow portion of the spoke portion as described above, manufacturing management can be made easier compared to conventional wheels.

f In addition, since the hollow cylindrical hub, cylindrical spokes, and rim are integrally formed, the rigidity in the direction perpendicular to the circumferential surface of the vehicle wheel can be increased, making it suitable for use as a wheel for wide tires. Are better.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the vehicle wheel of the present invention, and FIG. 1 is a side view thereof;
FIG. 2 is a sectional view taken along the - line in FIG. 1. 1... Hub, 1a... Axle mounting hole, 2... Spoke part, 3... Rim, 4, 4a... Hollow part, 4b
...A cylindrical hollow part.

Claims (1)

[Scope of utility model registration request] A hub in which an axle mounting hole is formed, a rim on which a tire is mounted, and a plurality of spokes connecting the rim and the hub are integrally molded, and the hub is formed in a hollow cylindrical shape centered on the axle. The spokes are formed into a cylindrical shape, and one end is connected to the outer circumferential surface of the hub and arranged radially around the axle, and the other end of the spoke is connected to the inner surface of the rim. formed into an annular shape joined to
One end of the cylindrical spoke part is formed integrally with the inside of the spoke part and the inside of the hollow cylindrical hub so that they both form a hollow part. A vehicle wheel characterized in that the other end is closed and integrally formed with the rim.