TWI626174B - Wheel rim for bicycle and method for processing spoke hole of the rim - Google Patents

Abstract

A bicycle rim comprising an inner ring wall and an outer ring wall, the outer ring wall surrounding the outer ring wall and spaced apart from the inner ring wall by a predetermined distance, wherein the inner ring wall is heated A spoke hole is processed in a pressing manner, and a bearing portion is extruded at the periphery of the top end of the spoke hole at the same time during the forming process, and the outer ring wall is drilled with a drill hole, and the perforation corresponds to the spoke of the inner ring wall hole. Thereby, the rim of the present invention allows the spoke head to be easily installed in the spoke hole by the perforation, and provides a good supporting effect on the spoke head by the bearing portion after the installation is completed, and the processing method by the hot spinning method is additionally utilized. It can eliminate the congenital weakness of the slotted rim and achieve the effect of simplifying the process, not damaging the structure and reducing material waste.

Description

Wheel rim for bicycle and method for processing spoke hole of the rim

The invention relates to bicycles, and more particularly to a method for processing a rim of a bicycle and a spoke hole of the rim.

In the conventional method for manufacturing a bicycle rim, the alloy material is mainly extruded by extrusion molding, and the alloy material must be heated to a semi-molten shape during extrusion, and then squeezed into the pressure. The mold having a plurality of holes is divided into three or four pieces and then inserted into the back mold to be melted into one body and then extruded, which is called a seam extrusion type, and then extruded by pressure and then fixed by welding. Finally, it is bent into an annular frame, and the two ends of the annular frame are connected together, thus forming a slotted rim. In order to assemble the rim 1 and the spokes, the inner ring wall 2 of the rim 1 needs to process a plurality of spoke holes 3, as shown in Fig. 1, and then one end of the spoke is threaded to a screwing member, and the snail is reused. The fitting screw is disposed in the spoke hole 3 of the rim 1 to complete the fixing of the spoke.

However, in the prior art, the spoke hole 3 is usually disposed on the bonding wire 4 formed by the rim 1 during the extrusion process. As shown in Fig. 1, this position is just where the entire rim 1 is relatively fragile. Thus, under the long-term use, the rim 1 can easily break from the spoke hole 3 in the direction of the bonding wire 3. In order to solve this structural problem, the conventional method will increase the entire inner ring wall 2 by The thickness enhances the structural strength of the rim 1, but the increase in wall thickness affects the weight of the rim 1 so that the rim 1 cannot simultaneously meet the demand for weight reduction. In order to solve the problem of weight, the rim disclosed in the CN103192662 patent case is finished. After the processing of the spoke holes, a part of the circumference of the rim is processed by the milling cutter, especially for the position outside the spoke holes, so that the structural strength of the rim can be appropriately reduced without being greatly affected. The weight of the rim. However, in the aforementioned conventional patent case, in addition to the inconvenience in mounting the spokes, a step of milling is performed after the processing of the spoke holes is completed, so that problems of complicated processes, high manufacturing costs, and waste of materials are caused.

The main object of the present invention is to provide a rim for a bicycle, which can maintain the convenience of mounting the spoke head, and can provide good support strength to the spoke head, and can increase the structural strength while satisfying the weight reduction. Improve fatigue performance.

In order to achieve the above object, the rim of the present invention comprises an inner ring wall, an outer ring wall, two side walls and two fetal lip engaging walls, the outer ring wall surrounding the outer ring wall and the inner ring wall The top and bottom ends of the two side walls are respectively connected to the left and right sides of the inner and outer ring walls, and the two fetal lip engaging walls are respectively away from the top end of the side wall toward the outer ring. Extending in the direction of the wall for engaging a tire lip of the tire, wherein the inner ring wall has a plurality of spoke holes and a plurality of bearing portions, each of the spoke holes penetrating the top and bottom sides of the inner ring wall Each of the abutting portions is respectively disposed at a periphery of a top end of each of the spoke holes, and the outer ring wall has a plurality of perforations, each of the perforations respectively penetrating the top and bottom surfaces of the outer ring wall and corresponding to the inner ring wall respectively Each spoke hole, wherein each of the bearing portions is formed by hot-spinning the inner ring wall by using a hot-melt drill and the respective perforations of the outer ring wall toward the inner ring wall.

It can be seen from the above that the rim of the present invention allows a spoke head to be easily installed in the spoke hole by the perforation, and provides good spoke head by the bearing portion after the installation is completed. The contact surface and support effect enable the spoke head to be quickly assembled with the rim of the present invention.

In an embodiment of the invention, the aperture of the aperture is larger than the aperture of the spoke aperture, such that the spoke head can be more conveniently placed into the spoke aperture.

A second object of the present invention is to provide a method for processing a spoke hole of the aforementioned rim, which can greatly increase structural strength and improve fatigue performance while satisfying weight reduction, and has a simplified process, no damage to the structure, and reduction of material waste. Features.

In order to achieve the above object, the spoke hole processing method of the present invention comprises the following two steps. Firstly, a drill bit is used to machine each of the perforations outside the rim of the rim, and then the hot-melt drill is used to process the spoke holes of the inner ring wall of the rim by hot spinning, and borrow Extrusion by the hot melt drill causes the inner ring wall of the rim to form each of the abutments at the periphery of the top end of each of the spoke holes.

In the spoke hole processing method of the present invention, before the hot-melt drill is used, a fixture may be installed on the bottom surface of the inner ring wall of the rim, after the hot-melt drill passes through the inner ring wall of the rim It will be accepted by the jig, so that the extension length of the bottom end of the spoke hole can be controlled.

Detailed construction, features, assembly or use of the rim and its spoke hole processing method provided by the present invention will be described in the detailed description of the subsequent embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not limited by the scope of the invention.

"Utility Technology"

1‧‧‧ rims

2‧‧‧ Inner Ring Wall

3‧‧‧ spoke holes

4‧‧‧bonding line

"this invention"

10‧‧‧ rims

12‧‧‧ Inner Ring Wall

14‧‧‧ outer ring wall

16‧‧‧ side wall

18‧‧‧ fetal lip card wall

20‧‧‧ spoke holes

22‧‧‧ bearing flange

24‧‧‧Perforation

26‧‧‧ Department of Management

28‧‧‧ spoke head

29‧‧‧ drill bit

30‧‧‧Hot melt drill

40‧‧‧ fixture

42‧‧‧Tough groove

50‧‧‧ fixture

52‧‧‧ socket

Figure 1 is a schematic view of the structure of a conventional rim, mainly showing the position of the spoke holes.

Fig. 2 is a perspective view showing the appearance of a rim according to a first embodiment of the present invention.

Fig. 3 is a partial perspective sectional view showing the rim of the first embodiment of the present invention.

Fig. 4 is a schematic cross-sectional view showing the use of a rim-equipped spoke head according to a first embodiment of the present invention.

Fig. 5 is a flow chart showing the manufacturing process of the rim according to the first embodiment of the present invention.

Figure 6 is a partial perspective cross-sectional view showing a rim according to a second embodiment of the present invention.

Figure 7 is a schematic view showing the processing flow of the rim according to the second embodiment of the present invention.

Figure 8 is a partial perspective cross-sectional view showing a rim according to a third embodiment of the present invention.

Figure 9 is a schematic view showing the processing flow of the rim according to the third embodiment of the present invention.

Referring to Figures 2 and 3, the rim 10 of the first embodiment of the present invention includes an inner ring wall 12, an outer ring wall 14, two side walls 16, and two fetal lip engaging walls 18. The outer ring wall 14 surrounds the outer periphery of the inner ring wall 12 and is spaced apart from the inner ring wall 12 by a predetermined distance. The top and bottom ends of the two side walls 16 are respectively connected to the left and right sides of the inner and outer ring walls 12 and 14, respectively. On the side, the two fetal lip engaging walls 18 extend from the top end of one side wall 16 away from the outer ring wall 14 for engaging the tire lip (not shown) of the tire (not shown). . The inner ring wall 12 has a plurality of spoke openings 20, each of the spoke holes 20 extends through the top and bottom surfaces of the inner ring wall 12, and a peripheral portion of the top end of each spoke hole 20 is provided with a bearing portion 22, and the outer ring wall 14 There are a plurality of perforations 24, each of which extends through the top and bottom surfaces of the outer ring wall 14 and corresponds to a spoke hole 20 of the inner ring wall 12. In addition, in this embodiment, the bottom end of each spoke hole 20 faces away from the inside. A tube portion 26 extends in the direction of the annular wall 12.

As can be seen from the above structure, as shown in Fig. 4, the rim 10 of the present invention allows a spoke head 28 to be easily mounted in the spoke hole 20 by the through hole 24, and the spoke head 28 is held by the bearing portion 22 after the mounting is completed. Providing a good supporting effect enables the spoke head 28 to be quickly assembled with the rim 10 of the present invention to achieve an effect of increasing assembly convenience. To further increase the ease of assembly process, the apertures of the perforations 24 can be larger than the apertures of the spoke openings 20, allowing the spoke heads 28 to be more easily placed within the spoke openings 20 through the perforations 24.

The above is the detailed structure of the rim 10 of the present invention, and the method of processing the spoke holes of the rim 10 of the present invention will be described below.

a): As in step S1 shown in Fig. 5, the perforations 24 are machined into the outer wall 14 of the rim 10 using a general drill bit 29.

b): as in step S2 shown in Fig. 5, the inner ring wall 12 of the rim 10 is subjected to hot spinning processing via a perforation 24 using a hot melt drill 30, at which time the inner ring wall 12 of the rim 10 is subjected to heat. The high temperature friction of the melt drill 30 forms a molten state at the position of the machining point, and the spoke hole 20 is machined after the hot melt drill 30 passes through the inner ring wall 12 of the rim 10. In the process of processing the spoke hole 20 by the hot-melt drill 30, since the inner ring wall 12 of the rim 10 is in a molten state, the periphery of the tip end of the spoke hole 20 is pressed by the hot-melt drill 30 to the bearing portion 22, In addition, the peripheral edge of the bottom end of the spoke hole 20 will follow the downward displacement of the hot melt drill 30 and extend away from the inner ring wall 12 in the direction of the tube portion 26, as shown in Fig. 4.

Referring to Figures 6 and 7, in the second embodiment of the present invention, before the inner ring wall 12 of the rim 10 is processed using the hot-melt drill 30, the step S2 shown in Fig. 7 is first installed. With the bottom surface of the inner ring wall 12 of the rim 10, the jig 40 has a tapered groove 42, followed by a step S3 as shown in Fig. 7, in the inner wall 12 of the rim 10 using the hot melt drill 30. Machining spoke holes After 20, the end of the hot melt drill 30 will extend into the tapered groove 42 of the jig 40, at which time the length of the tubular portion 26 will be limited by the tapered groove 42 of the jig 40.

Referring to FIGS. 8 and 9, the jig 50 used in the third embodiment of the present invention has a receiving groove 52 after the spoke hole 20 is machined in the inner ring wall 12 of the rim 10 using the hot melt drill 30. The end of the hot-melt drill 30 abuts against the receiving groove 52 of the jig 50, as shown in step S3 of FIG. 9, when the bottom end of the spoke hole 20 is restricted by the receiving groove 52 of the jig 50. The tube portion 26 as in the previous embodiment is extended downward so that the bottom end of the spoke hole 20 and the bottom surface of the inner ring wall 12 of the rim 10 are brought into a state of being flush with each other.

In summary, the spoke hole processing method of the present invention mainly utilizes the high temperature generated by the hot melt drill 30 during high-speed rotation to cause the rim 10 to be in a molten state and then extrude the rim 10 out of the spoke hole 20 while being in a hot spin. The bearing portion 22 is formed during the press working process, and the milling process used in the conventional technology can be omitted to achieve the effect of simplifying the process, thereby solving the problem of chip evacuation and material waste caused by the conventional drilling method. Furthermore, the hot spinning method used in the present invention is different from the conventional drilling method. The present invention does not destroy the internal grain arrangement of the rim 10 during the hot spinning process, but instead the internal grain of the processing position is Remelted together. In addition, the present invention simultaneously produces the bearing portion 22 at the periphery of the spoke hole 20 in the process of processing the spoke hole 20 by hot spinning, and on the one hand, the spoke head 28 provides a good supporting effect by the bearing portion 22, and On the one hand, by the bearing portion 22, the thickness of the inner ring wall 12 around the spoke hole 20 is increased, and it is not necessary to increase the structural strength of the rim 10 by increasing the thickness of the entire inner ring wall 12 as in the prior art. The spoke hole processing method of the present invention not only allows the rim 10 to maintain good structural strength, but also allows the rim 10 to achieve a lightweight effect.

Claims (6)

A rim for a bicycle, comprising an inner ring wall, an outer ring wall, two side walls and two fetal lip engaging walls, the outer ring wall surrounding the outer ring wall and between the inner ring wall The top and bottom ends of the two side walls are respectively connected to the left and right sides of the inner and outer ring walls, and the two fetal lip engaging walls are respectively away from the top end of the side wall toward the outer ring wall. The inner ring wall has a plurality of spoke holes and a plurality of bearing portions, each of the spoke holes penetrates the top and bottom surfaces of the inner ring wall, and each of the bearing portions is respectively disposed on each of the spoke holes a peripheral edge of the top end, the outer ring wall has a plurality of perforations, each of the perforations respectively penetrating the top and bottom surfaces of the outer ring wall and respectively corresponding to the spoke holes of the inner ring wall, wherein each of the abutting portions is used A hot melt drill is formed by hot spinning of the inner ring wall by the respective perforations of the outer ring wall toward the inner ring wall. The bicycle rim according to claim 1, wherein a bottom end of the spoke hole is flush with a bottom surface of the inner ring wall. A bicycle rim according to claim 1, wherein a bottom end of the spoke hole extends in a direction away from the inner ring wall. The bicycle rim according to claim 1, wherein the perforation has a larger aperture than the aperture of the spoke hole. A method of processing a spoke hole of a rim according to any one of claims 1 to 4, comprising the steps of: a) machining a perforation of the ring wall outside the rim using a drill bit; b) using the hot-melt drill to machine the spoke holes of the inner ring wall of the rim by hot spinning, and extruding the hot-melt drill to make the inner ring wall of the rim Each of the abutments is formed at a periphery of the tip end of the spoke hole. The method for processing a spoke hole according to claim 5, in the step b), first installing a fixture on the bottom surface of the inner ring wall of the rim, and processing the inner ring wall of the rim by using the hot melt drill After the spoke hole, the hot melt drill is taken up by the jig.