JPH0532321Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is a wheel for a vehicle such as a two-wheeled motor vehicle, specifically, a wheel having a hollow structure,
The present invention relates to a vehicle wheel that is integrally cast.

[Conventional technology]

2. Description of the Related Art Conventionally, there are wheels that are made lighter by having spokes of a hollow structure. An example of this is shown in FIG.

In FIG. 4, the wheel 1 includes a hub 2 that supports an axle (not shown), hollow spokes 3 extending radially from the hub 2, and the spokes 3.
The rim 4, which is connected to the hub 2 via the rim 4, is integrally cast. In this wheel 1, the inner peripheral side 5a of the hollow portion 5 of the spokes 3 opens into a space 6 through which the axle passes through the hub 3, so that the hollow portion 5 can be formed by the core A. .

[Problem that the invention attempts to solve]

However, in the above-mentioned prior art, since only the center portion A1 of the core A is supported by the two outer molds B, a positional shift occurs at the outer peripheral end portion A2. For this reason, conventionally, since uneven thickness occurs in the spokes 3, it is necessary to make the spokes 3 thick in consideration of this, and therefore it is not possible to reduce the weight of the wheel 1 sufficiently.

Therefore, a wheel is known in which small holes are provided on the left and right sides of the spokes 3 in the drawing, and the outer circumferential ends A2 of the core A are positioned using these small holes (see Japanese Patent Laid-Open No. 61-92754). ). However, in this prior art, it is difficult for rainwater that has entered the hollow part of the spoke through the small hole to drain out, and therefore rainwater accumulates in the hollow part. In addition, the small holes provided for manufacturing purposes remain on the side of the wheel, which is a conspicuous part, resulting in an unsightly appearance.

This invention was made in view of the above-mentioned conventional problems, and the purpose is to provide a vehicle wheel that is free from the risk of rainwater accumulating in the hollow portions of the spokes and has a good appearance.

[Means for solving problems]

In order to achieve the above object, this invention provides an opening in at least one of the front and rear surfaces in the rotating direction of the hollow spoke, which is in contact with the inner circumferential surface of the rim and communicates with the hollow part of the spoke. .

[Effect]

Rainwater that has entered the hollow part of the above spokes,
Due to the centrifugal force and inertia in the circumferential direction that occur as the wheel rotates, the holes move relative to the rim in the longitudinal direction of rotation along the inner circumferential surface of the rim. According to this invention, which is provided on at least one of the front and rear surfaces in the rotational direction of the spoke so as to be in contact with the inner circumferential surface of the spoke, the moved rainwater flows toward the above-mentioned opening, so that water can easily drain out. Therefore, there is no risk that rainwater or the like will accumulate in the hollow parts of the spokes.

Further, since the holes are provided on the front and rear surfaces of the spoke in the rotational direction, which are not easily visible from the side of the vehicle, there is no risk of the holes spoiling the aesthetic appearance of the wheel.

〔Example〕

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

In FIG. 1, three spokes 3 are provided radially from the hub 2 toward the rim 4. Opening holes 7A and 7B are provided in the front surface 3a and rear surface 3b of the spokes 3 in the rotational direction, respectively, so as to contact the inner circumferential surface 4a of the rim 4. 8
is a rib, which is arranged between the inner circumferential surface 4a of the rim 4 and the front surface 3a or rear surface 3b of the spokes 3,
A notch 8a is located at a position opposite to the openings 7A and 7B.
is provided.

In FIG. 2, the openings 7A, 7B and the rib 8 are provided at the center of the spoke 3 in the left-right direction, and the rib 8 is provided so as to cover the openings 7A, 7B. The rest of the structure is the same as that of the conventional example shown in FIG. 4, and the same or corresponding parts are denoted by the same reference numerals, and detailed explanation thereof will be omitted.

Next, a method of manufacturing the wheel 1 will be explained.

First, on the core A, presser portions A3 shown in FIG. 3 are formed to protrude at positions corresponding to the openings 7A and 7B. This presser part A3 fits into the outer shape B,
The tip of a cross-sectional hollow pin P that penetrates the outer mold B is in contact with it. The core A in FIG. 2 is supported by the two outer molds B at the center A1, and the holding part A3 in FIG. 3 is supported by the outer mold B to supply hot water.
Therefore, since the core A is also supported at the outer circumferential end A2 in FIG. 2, there is no risk of uneven thickness in the spokes 3. In particular, in this embodiment, since two holding parts A3 shown in FIG. 3 are provided, the core A can be supported more stably, so that the spoke
The wall thickness becomes more uniform. In addition, when hot water is supplied, core A
Gas generated from the hollow pin P is discharged upward through the hollow portion S of the hollow pin P. Further, the holding portion A3 of the core A may be a projection that is separate from the core A and is added to the core A.

In the above-mentioned structure, since this invention provides the openings 7A, 7B in the hollow spoke 3 of FIG. 1, rainwater enters the hollow portion 5 through the openings 7A, 7B, etc. As the wheel 1 rotates in the direction of arrow C and travels in the direction of arrow D, this rainwater that has entered is subjected to the action of centrifugal force and inertia in the circumferential direction, so that the inner circumferential surface of the rim 4 4a relative to the rim in the circumferential direction, ie in the direction of arrow E. Here, the openings 7A and 7B are located on the inner circumferential surface 4 of the rim 4.
a and in the direction of rotation of the spokes 3, the relatively moved rainwater flows toward the openings 7A, 7B, and the openings 7A, 7B
easily flows out. Therefore, there is no risk that rainwater or the like will accumulate in the hollow portions 5 of the spokes 3. In addition,
It goes without saying that this effect can be obtained even if only one of the openings 7A and 7B is provided.

In addition, the above-mentioned opening 7 provided from a manufacturing point of view
Since A and 7B are provided on the front and rear surfaces 3a and 3b of the spoke 3, they are not easily visible from the side of the vehicle. Therefore, there is no risk that the apertures 7A and 7B will spoil the aesthetic appearance of the wheel 1. This effect is particularly significant in vehicles such as motorcycles where the design of the wheel 1 greatly influences its appearance.

By the way, since the openings 7A and 7B are provided, the strength members of the spokes 3 are damaged. However, since the openings 7A and 7B are formed on the front and rear surfaces 3a and 3b of the spokes 3, the above defects can be compensated for by the ribs 8 that are normally provided.

Furthermore, in this embodiment, since the rib 8 shown in FIG. 2 is provided to cover the openings 7A and 7B,
Rainwater flows into the spokes 3 from the openings 7A and 7B,
There is little risk of dust entering.

By the way, since the hollow pin P shown in Fig. 3 is generally shaped like a round pipe, it is easier to manufacture it if the notch 8a shown in Fig. 1 is made circular to match the cross section of the pin P (Fig. 3). become.

[Effect of idea]

As explained above, according to this invention, in a wheel that has hollow spokes and is integrally cast, the holes are arranged so that they are in contact with the inner peripheral surface of the rim.
Moreover, since it is provided on at least one of the front and rear surfaces in the rotational direction of the spoke, the weight of the wheel can be reduced, and there is no risk of rainwater accumulating in the hollow part of the spoke or spoiling the aesthetic appearance of the wheel.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of this invention, and is a partially sectional side view of the wheel, and Fig. 2 is a side view of the wheel shown in Fig. 1.
FIG. 3 is a cross-sectional view taken along the - line in FIG. 2, and FIG. 4 is a vertical cross-sectional view showing a conventional wheel. 1...Wheel, 2...Hub, 3...Spokes, 3a, 3b...Front and rear surfaces, 4...Rim, 4a...
...Inner circumference surface, 5...Hollow part, 5a...Inner circumference side of hollow part, 5b...Outer circumference side of hollow part, 6...Space, 7
A, 7B...Open hole.

Claims (1)

[Scope of utility model registration request] A vehicle wheel in which a hub for pivotally supporting an axle, hollow spokes extending radially from the hub, and a rim connected to the hub via the spokes are integrally cast, the hollow portions of the spokes being integrally cast. The outer circumferential side of the hollow part is closed by the rim, the inner circumferential side of the hollow part opens into a space through which the axle of the hub passes, and the inner circumferential surface of the rim is closed on at least one of the front and rear surfaces in the rotational direction of the spokes. A vehicle wheel provided with an aperture that abuts and communicates with the hollow portion.