JPH0920101A - Wheel and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wheel of which irregular rotation and the like are not generated, manufacture is easy, and the price is low, by integratedly forming the whole body extending from a boss part to a rim part on the outer circumference side out of light metal, and providing a penetrating part for mounting a bearing and an axle on the boss part. SOLUTION: This wheel 1 is provided with a plurality of arms 3 extending from a boss art 2 to the outer circumference side, and an annular rim part 4 held with these arms 3 on the outer circumference, and the whole body is integratedly formed out of light metal. The boss part 2 is formed with a through part 5 penetrating through the center part, composed of large diameter parts 5a provided on the opening part side of both ends and a small diameter part 5b provided between the large diameter parts 5a, bearings 7, 7 are fitted in both end parts of the large diameter parts 5a without play, nut members 9, 9 are fitted to both end parts of the small diameter part 5b for supporting the bearings 7, 7 so as not to slip out, and an axle 8 extending between the mutual bearings 7, 7 is insertedly fitted so as to spacedly hold the nut members 9, 9 in a fixed distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheel used for a wheel of a bicycle and the like and a manufacturing method thereof.

[0002]

2. Description of the Related Art Some wheels of bicycles and the like are integrally formed of resin from the boss portion to the outer peripheral rim portion. This resin wheel is suitable in that the structure can be simplified and the weight can be reduced as compared with a steel spoke wheel or the like. In this resin wheel, a short tubular member made of metal is insert-molded on the boss portion, and a bearing tool such as a bearing and an axle are attached to the short tubular member as a measure for strength. In this insert molding, a short tubular member with bearings and axles assembled in advance is set in a predetermined direction at the boss-corresponding position in the molding die that constitutes the molding recess of the wheel shape, and then the molding die This is performed by pouring uncured resin into (around the short tubular member).

[0003]

By the way, the above-mentioned short tubular member is provided with complicated irregularities on its outer peripheral surface in order to prevent slipping or displacement in the axle direction in the boss portion. I need to put it. Therefore, it is necessary to manufacture the short tubular member itself by casting, which increases the number of steps related to wheel manufacturing and lowers manufacturing efficiency,
It was troublesome and costly.

Further, since the resin wheel is apt to warp or load unbalance due to cooling shrinkage of the resin after casting, when it is assembled as a bicycle, for example,
Although there is no hindrance to the running, there is a drawback in that the wheels are unevenly rotated and the appearance is deteriorated. The present invention has been made in view of the above circumstances, and an object thereof is to provide a wheel for a wheel that does not cause uneven rotation and the like and that can be manufactured easily and at low cost, and a manufacturing method thereof. And

[0005]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, in the present invention (wheel for a wheel) according to claim 1, the entire portion from the boss portion to the outer peripheral rim portion is integrally formed of light metal, and the boss portion is provided with a penetrating portion for mounting a bearing tool and an axle. It is characterized by

By integrally forming the entire wheel with the light metal as described above, it is possible to directly provide the boss portion with the through portion for mounting the bearing and the axle. That is, there is no need for the trouble of separately manufacturing the conventional short tubular member and inserting the short tubular member.
Further, since it is made of light metal, dimensional distortion is less likely to occur due to cooling after casting, and it is possible to obtain a wheel free from warpage, load imbalance, and the like. Therefore, there is an advantage that uneven rotation of the wheels can be prevented. In addition, since it is possible to reduce the thickness while maintaining a predetermined strength (it can be set to about 2 mm), it is possible to further reduce the weight.

As the light metal, magnesium alloy, aluminum alloy or the like can be used. Further, according to the present invention of claim 2 (method for manufacturing a wheel for a wheel), a bearing corresponding to a position of a boss portion is formed in a forming die which forms a forming concave portion of a wheel shape extending from a boss portion to a rim portion on an outer peripheral side thereof. The present invention is characterized in that a molten core of light metal is cast into the molding recess after a core forming a through hole for mounting a tool and an axle is loaded.

When the wheel is manufactured in this manner, the conventional procedure of setting the short tubular member in the forming die is not required. Therefore, the manufacturing of the short tubular member and the bearing tool for the short tubular member and Not only the assembling of the axle, but also the labor and cost for positioning the short tubular member with respect to the forming die can be omitted. Further, the present invention according to claim 3 (a method for manufacturing a wheel for a wheel) is obtained by pouring a molten light metal into a forming die which forms a forming concave portion of a wheel shape extending from a boss portion to a rim portion on an outer peripheral side thereof. It is characterized in that the boss portion of the cast-molded product is formed with a penetrating portion for mounting the bearing and the axle by machining.

In this manufacturing method, the bearing fitting and the through-hole for mounting the axle provided on the boss are machined to the cast-molded product obtained after the casting. It is possible to position the rotation center or the optimum position in consideration of the load balance of each product with high accuracy. Therefore, there is an advantage that unevenness in rotation and blurring of the wheels can be minimized.

By combining the methods of claims 2 and 3, the formation of the penetrating portion with respect to the boss,
It is also possible to perform the rough formation by the core and the finish formation by machining in two stages.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a wheel 1 which is one of the embodiments of the present invention.
Is integrally formed of light metal over a plurality of arms 3 extending from the boss portion 2 to the outer peripheral side thereof and a rim portion 4 held by the arms 3.

As the light metal, for example, a magnesium alloy is preferably used. Especially when mass production is performed by die casting, (Mg) 90.4% by weight, (A)
l) 8.7% by weight, (Zn) 0.7% by weight, (Mn)
It is preferred to use 0.2% by weight of die casting alloy. The boss portion 2 has a penetrating portion 5 penetrating its central portion.
Is provided. The penetrating portion 5 has a large-diameter portion 5a provided near both ends of the penetrating portion 5 and a small-diameter portion 5b provided between the large-diameter portions 5a.

As shown in FIG. 3, the large diameter portion 5a has a bearing member 7a.
The main purpose is to fit in without rattling. Further, it is also used for accommodating most of the nut members 9 that are screwed from both sides to the axles 8 that are inserted in the bearing tools 7 on both sides in a skewered manner and that hold the bearing tools 7 irremovably. The nut member 9 is adapted to act as a grease sealing plug for the bearing member 7 due to the portion accommodated in the large-diameter portion 5a, which not only lubricates the bearing member 7 but also intrudes sand or water. Can be blocked. Reference numeral 10 is a nut for preventing the nut member 9 from loosening.

The small-diameter portion 5b is used for holding the bearing members 7 on both sides at a predetermined interval and for allowing the axle 8 to pass through between the bearing members 7. In addition, this boss 2
In addition, as shown in FIG.
A male screw portion 11 is engraved on the outer peripheral side of the. The male screw portion 11 is used, for example, when the wheel 1 is used as a rear wheel of a two-wheeled vehicle, and when a drum type or disc type brake device, a transmission, etc. (all not shown) are attached to the wheel 1. Is used. However,
The male screw portion 11 can be eliminated if, for example, a brake device (not shown) of a cantilever type or a center pull type is attached to the wheel 1 and the transmission is not attached.

The shape and the number of the arms 3 are not limited at all. For example, the arms 3 may be thin and the number of arms may be increased to represent spokes or a mesh shape, or the boss portion 2 and the rim portion 4 may be formed to be connected in a plate shape. It is also possible. FIG. 4 shows a wheel manufacturing method which is one of the embodiments of the present invention. In this manufacturing method, a molding die 16 capable of forming a molding concave portion 15 of a shape corresponding to the wheel 1 and a molding die A core 17 to be loaded into the inside 16 is used.

The molding die 16 has, for example, split dies 18 and 19 which can be divided and combined in the vertical direction, and corresponds to the boss portion 2 of the wheel 1 in the molding recess 15 formed during the molding. A core holding portion 20 is provided at the position to be turned. In this molding die 16, a parting line may be set appropriately with respect to the loading direction of the core 17 and the demolding direction, and thus the number of divisions, the dividing direction, the mold structure, etc. are not limited at all.

The core 17 is formed by molding sand or the like into a shape corresponding to the penetrating portion 5 by means of a core remover (not shown) or the like. It is also possible to use a metallic material as the core 17. However, in this case, it is advisable to have a structure that allows connection / separation in consideration of the releasability of the through portion 5 from the large diameter portion 5a and the small diameter portion 5b.

In the molding die 16 having such a structure, the split dies 18 and 19 are divided, and the core 17 is loaded into the core holding portion 20 in a predetermined state to be combined. Then, the molten light metal is poured into the mold. When the poured light metal has cooled and hardened to some extent, the mold is removed or the mold is collapsed to take out the cast product having the wheel shape.
Then, the wheel 1 is obtained by performing deburring, polishing, finishing machining, etc., if necessary.

By the way, the invention is not limited to the above embodiment. For example, it is possible to cast a light metal without using the core 17 in the molding die 16. In this case, the obtained cast-molded product is in a state where the penetrating portion 5 is not yet provided (clogged) in the portion corresponding to the boss portion 2. Therefore, the penetrating portion 5 having a predetermined shape is formed by machining using a lathe, a milling machine, or the like.

[0020]

As is apparent from the above description, in the present invention (wheel for wheel) according to claim 1, the entire body from the boss portion to the outer peripheral rim portion is integrally formed of light metal and the boss portion is formed. Since it has a through hole for mounting the bearing and axle, it is not necessary to separately manufacture a short tubular member for mounting the bearing and axle, and to attach this short tubular member to the boss. Becomes for that reason,
The manufacturing efficiency of the wheel (as the assembly of the bearing and the axle) can be significantly improved, and the manufacturing thereof can be performed easily and at low cost.

Further, since it is made of light metal, it is possible to obtain a wheel with high accuracy and without warping and which has an excellent load balance, and there is an advantage that uneven rotation of the wheel can be prevented. Therefore, it looks good when the vehicle is running. Further, in the case of using a cantilever type or center pull type braking device, there is an advantage that a smooth and reliable operating condition can be obtained especially during high-speed traveling.

Since it is made of a light metal, it has an advantage that it can be thinned while having a required strength, so that it is possible to further reduce the weight of the wheel. Further, according to the present invention of claim 2 (method for manufacturing a wheel for a wheel), a bearing is formed in a molding die forming a molding recess of a wheel shape extending from a boss portion to a rim portion on an outer peripheral side thereof in correspondence with a position of the boss portion. Since the molten light metal is cast into the molding recess after the core that forms the fitting and the through-hole for mounting the axle is loaded, the manufacturing of the short tubular member and the bearing tool and the axle for the short tubular member are performed. No assembly work is required. Therefore, the manufacturing efficiency of the wheel (as the assembly of the bearing and the axle) can be significantly improved, and the manufacturing thereof can be performed easily and at low cost.

Conventionally, a contractor who manufactures short tubular members and assembles bearings and axles for the short tubular members is inevitably different from a resin wheel molder. While it was necessary to perform packing, transportation, unpacking, quality judgment, etc. of the parts in between, the present invention allows only one trader to perform from wheel molding to assembly, thus improving manufacturing efficiency and lowering costs. There is an advantage that can be achieved.

Further, according to the present invention of claim 3 (method for manufacturing a wheel for a wheel), a cast product of a wheel shape is obtained without using a core, and then a bearing is provided at a position corresponding to the boss portion of the cast product. Since the mounting penetrating portion for the tool and the axle is formed by machining, it is possible to position the penetrating portion with high accuracy at an optimum position in consideration of the wheel rotation center or the load balance of each product. for that reason,
There is an advantage that uneven rotation and shake of the wheels can be minimized.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 2 is an overall view showing a wheel that is an example of an embodiment of the present invention.

FIG. 3 is an enlarged cross-sectional view showing a situation in which a bearing tool and an axle are attached to a penetrating portion of a boss.

FIG. 4 is a diagram showing a wheel manufacturing method that is an example of the embodiment of the present invention.

[Explanation of symbols]

 1 Wheel 2 Boss Section 4 Rim Section 5 Penetration Section 7 Bearing Tool 8 Axle 15 Molding Recess 16 Molding Mold 17 Core

Claims (3)

[Claims] 1. The entire boss portion (2) to the outer peripheral rim portion (4) is integrally formed of light metal, and the boss portion (2) has a through hole for mounting a bearing (7) and an axle (8). A wheel for a wheel, characterized in that a part (5) is provided. 2. A molding die (16) constituting a molding recess (15) of a wheel shape extending from the boss portion (2) to the rim portion (4) on the outer peripheral side thereof, corresponding to the position of the boss portion (2). After loading the core (17) forming the through hole (5) for mounting the bearing tool (7) and the axle (8), the molten light metal is cast into the molding recess (15). A method of manufacturing a wheel for a featured wheel. 3. Cast molding obtained by pouring molten light metal into a molding die (16) forming a molding recess (15) of a wheel shape extending from the boss portion (2) to the rim portion (4) on the outer peripheral side thereof. A method for manufacturing a wheel for a wheel, characterized in that a bearing tool (7) and a through-hole (5) for mounting an axle (8) are formed on a boss (2) of the product by machining.