Rim, wheel, method for forming spoke holes in rim and pre-forming die

Abstract

The invention relates to a wheel rim, a wheel, a method for forming a spoke hole in the wheel rim and a pre-forming mold, in the pre-forming stage before the wheel rim is heated and cured, the basic shape of the spoke hole is formed by adopting a strip-shaped reinforcing unit in a winding manner, so that the continuity of reinforcing fibers at the edge of the spoke hole is reserved, and the spoke hole is formed in the pre-forming stage. And the axial load bearing capability of the edge of the spoke hole is enhanced.

Description

Technical Field

[0001] The present invention relates to wheel manufacturing technology, and particularly to the structure and manufacturing method of spoke holes in a rim of a bicycle wheel. Background Art

[0002] A typical bicycle wheel includes a rim, a hub (sometimes also referred to as a spoke drum), and spokes connecting the rim and the hub. In the past, most bicycle rims were made of metal materials such as aluminum. However, in recent years, rims made of advanced reinforcing materials mainly based on carbon fiber have become more popular due to their excellent performance. The manufacturing process of such carbon fiber rims usually forms the wall structure of the rim with laminated carbon fiber sheets. After preforming the carbon fiber sheets into an approximate shape of the rim, they are placed in a thermosetting mold for curing. Then, spoke holes are drilled at the ends of the rim. When installing the rim, the spokes are passed through the spoke holes, and one end of the spoke is connected to the hole end of the spoke hole through a spoke joint, and the other end of the spoke is connected to the hub.

[0003] There is a problem with the spoke holes formed by drilling in this way. That is, the process of drilling the spoke holes cuts the originally continuous carbon fiber at the spoke holes, and also causes microcracks to form in the matrix material in the edge area of the spoke holes. These two points result in a reduction in the ability of the edge of the spoke hole to bear axial loads, weakening the connection strength between the spoke hole and the spoke joint. Some manufacturers add additional material layers in the spoke hole area to increase its bearing strength to make up for this defect, but this increases the weight of the rim. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a rim and a method for forming spoke holes on the rim, which can form the basic shape of the spoke holes in the preforming stage before the rim is heated and cured, and maintain the continuity of the reinforcing fibers at the edge of the spoke holes.

[0005] The present invention is implemented by the following technical solutions:

[0006] The present invention proposes a rim, including a spoke connection part at the radially inner end. The spoke connection part is provided with spoke holes, and the outer periphery of the spoke holes has strip-shaped reinforcing units. Each reinforcing unit includes at least one layer of reinforcing fibers, and several reinforcing units are stacked in an interleaved manner around the spoke holes, and at least part of the reinforcing units are combined to construct the outer contour of the spoke holes.

[0007] In one embodiment, the reinforcing fibers are continuous or substantially continuous in the strip length direction of the reinforcing unit.

[0008] In one embodiment, at least part of the reinforcing units are tangent to the spoke holes.

[0009] In one embodiment, in the bar length direction of the reinforcing unit, the reinforcing unit bends and extends from the outer periphery of one spoke hole to the outer periphery of another adjacent spoke hole in an "S" shape around the axis of the spoke hole.

[0010] In one embodiment, in the bar length direction of the reinforcing unit, the reinforcing unit bends in a manner around the circumferential direction of the rim.

[0011] In one embodiment, a single reinforcing unit is bent in a U shape, and several reinforcing units form a U-shaped spoke connecting part extending from the radially inner end to the radially outer end of the rim.

[0012] In one embodiment, the reinforcing fibers of at least one reinforcing unit are distributed on the same side of the spoke hole and bend away from the spoke hole in a common direction.

[0013] In one embodiment, the reinforcing fibers of at least one reinforcing unit are distributed on both sides of the spoke hole and bend away from the spoke hole in opposite directions.

[0014] In one embodiment, the inner sides of the reinforcing units in contact with the spoke hole are connected one by one, and enclose the outer contour of the spoke hole.

[0015] In one embodiment, the reinforcing fibers are carbon fibers.

[0016] In one embodiment, at least one layer of sheet-shaped reinforcing substrate is further laid on the side of the reinforcing unit facing radially outward of the rim.

[0017] Based on the above-mentioned rim, the present invention further provides a wheel, including a rim, a hub, and spokes connecting the rim and the hub. The rim is the above-mentioned rim, the spokes extend through the spoke holes, and the spokes are connected to the spoke connecting part of the rim through spoke joints.

[0018] Moreover, the present invention further provides a method for forming spoke holes on a rim, including:

[0019] Providing a stud matching the shape of the spoke hole;

[0020] Winding a bar-shaped reinforcing unit around the outer periphery of the stud. During the winding process, the reinforcing unit gradually encloses the stud and roughly constructs the outer contour of the spoke hole;

[0021] Separating the stud and the reinforcing unit.

[0022] In one embodiment, the stud is provided on a pre-forming mold. The pre-forming mold is of an annular or arc-shaped structure. Several studs are fixedly arranged at intervals in the circumferential direction of the pre-forming mold at the radially inner end of the pre-forming mold, and the studs extend substantially radially inward of the pre-forming mold.

[0023] In one embodiment, the end of the convex column facing the radially inner end of the preform die is set to a sharp shape.

[0024] In one embodiment, a groove surrounding the outer periphery of the convex column is provided on the preform die, and the step of laying at least one layer of sheet-shaped reinforcing base in the groove before winding the reinforcing unit is further included.

[0025] In one embodiment, the step of laying at least one layer of annular strip-shaped reinforcing bar along the inner end circumference of the preform die before winding the reinforcing unit is further included.

[0026] In one embodiment, the reinforcing unit is bent in a circumferential manner around the preform die, and:

[0027] The reinforcing unit semi-surrounds the preform die in a manner that does not pass through the radially outer end of the preform die; or, the reinforcing unit completely surrounds the preform die in a manner that passes through the radially outer end of the preform die, and the step of removing a part of the reinforcing unit at the radially outer end of the preform die after the winding of the reinforcing unit is completed is further included.

[0028] In one embodiment, the reinforcing unit is a strip structure and is attached to the surface of the preform die.

[0029] In one embodiment, the reinforcing unit winds from the outer periphery of one convex column to the outer periphery of another adjacent convex column in an "S" - shaped path.

[0030] In one embodiment, the reinforcing unit is curled into a rod shape before winding.

[0031] In one embodiment, the step of thermosetting the formed rim is further included. In the thermosetting die, a pin body is provided and inserted into the spoke holes formed by enclosing the reinforcing unit.

[0032] The present invention also provides a preform die for forming spoke holes on a rim. The preform die is of an annular or arc-shaped structure, and several convex columns matching the shape of the spoke holes are fixedly arranged at intervals in the circumferential direction of the preform die at the radially inner end, and the convex columns extend substantially radially inwards of the preform die.

[0033] In one embodiment, the end of the convex column facing the radially inner end of the preform die is set to a sharp shape.

[0034] In one embodiment, a groove surrounding the outer periphery of the convex column is provided on the preform die.

[0035] The present invention has the following beneficial effects: The present invention forms the basic shape of the spoke holes at the preforming stage before the rim is heated and cured, without destroying the continuity of the reinforcing fibers at the edge of the spoke holes, effectively solving the problems in the background art and enhancing the ability of the edge of the spoke holes to bear axial loads. Brief Description of the Drawings

[0036] Figure 1 is a schematic view of a wheel in the embodiment;

[0037] Figure 2 is a cross-sectional view of the wheel in the embodiment;

[0038] Figure 3 is a schematic view of a preform mold in the embodiment;

[0039] Figure 4 is a schematic view of the winding of the reinforcing unit around the convex post on the preform mold in the embodiment;

[0040] Figure 5 is a planar development view of the reinforcing unit wound around the convex post in the embodiment;

[0041] Figure 6 is a development view of the reinforcing unit around the spoke hole after the rim is thermoset molded in the embodiment;

[0042] Figure 7 is a schematic view of an alternative example of the embodiment;

[0043] Figure 8 is a schematic view of the piercing and squeezing of the reinforcing unit by the convex post in the embodiment;

[0044] Figure 9 is a schematic view of another alternative example of the embodiment;

[0045] Figure 10 is a schematic view of the thermoset molding die and the pin body in the embodiment;

[0046] Figure 11 is a schematic view of the reinforcing base in the embodiment;

[0047] Figure 12 is a schematic view of laying a reinforcing strip on the preform mold in the embodiment. Detailed Description of the Invention

[0048] To further illustrate the embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0049] The present invention will be further described below in conjunction with the drawings and the specific embodiments.

[0050] First, refer to Figure 1 and Figure 2, respectively showing the structure of the wheel 900 and the connection structure between the rim 100 and the spokes 200. The wheel 900 includes a rim 100, a hub 800, and spokes 200 connecting the rim 100 and the hub. The rim 100 includes a spoke connection portion 101 at the radially inner end and a top 102 at the radially outer end. The spoke connection portion 101 is generally U-shaped. A spoke hole 103 is provided at the bent position of the spoke connection portion 101, that is, the innermost end of the spoke connection portion 101. The spoke hole 103 generally extends along the radial direction of the rim 100 (in some wheels, there is a slight angle between the plane where the spokes are located and the rim, and the spoke holes extend radially towards the center of the circle or extend substantially radially with a slight eccentricity according to the weaving method of the spokes between the rim and the hub). When the spoke 200 is connected to the rim 100, the spoke 200 passes through the spoke hole 103, and a spoke joint 300 is connected to the end of the spoke 200 extending into the rim 100. The other end of the spoke 200 is connected to the hub. By the spoke 200 bearing the tensile force, the spoke joint 300 is pressed against the edge of the spoke hole 103. Usually, the spoke joint 300 can be a threaded joint. It can be understood that the edge of the spoke hole 103 is always subjected to the forces from the spoke 200 and the spoke joint 300. Therefore, the strength of the edge of the spoke hole 103 affects the service life of the rim 100 to a certain extent.

[0051] During the forming process of the rim 100, usually the approximate shapes of the two parts, namely the spoke connection portion 101 and the top 102, are preformed separately. Then, the approximate shapes of the spoke connection portion 101 and the top 102 are spliced and placed in the cavity of a thermosetting forming mold for heating and curing. Usually, an airbag is also placed in the cavity surrounded by the spoke connection portion 101 and the top 102. Before heating and curing, the airbag is inflated so that it can expand and press against the inner wall of the rim to obtain an ideal rim shape.

[0052] In the prior art, the material commonly used for forming the shape of the rim 100 is a composite reinforcing material pre-impregnated with a matrix material. For example, typically, it is a carbon fiber cloth pre-impregnated with epoxy resin. During the preforming process of the spoke connection portion 101, the prior art always laminates a whole piece of carbon fiber sheet on the inner edge of an annular mold to form the U-shaped inner bend of the spoke connection portion 101. The whole piece of carbon fiber sheet completely covers the position of the spoke hole 103, and the spoke hole 103 is drilled on the spoke connection portion 101 only after the rim 100 is heated and cured.

[0053] This embodiment first provides a method for forming spoke holes on the rim by means of winding. This method can form the basic shape of the spoke holes 103 at the preforming stage before the rim 100 is heated and cured, and does not damage the continuity of the carbon fiber at the edge of the spoke holes 103.

[0054] AsFigure 3 , a preform mold 400 adopted in this embodiment is shown. The preform mold 400 is used to preform the shape of at least the portion of the spoke connection part 101 around the spoke hole 103. The preform mold 400 is of an annular structure so as to be able to form the shape of a circle of spoke connection parts 101. Or, in other embodiments, the preform mold 400 can also be of an arc-shaped structure, and the arc-shaped splicing is used to form the shape of a circle of spoke connection parts 101. If the preform mold 400 adopts an arc-shaped structure, the formed rim preform structure on the preform mold 400 has a slightly worse forming accuracy due to the need for further splicing, but the arc-shaped preform mold 400 is easier to separate from the rim preform structure. At the radially inner end of the preform mold 400, there are protruding columns 1. The outer shape of the protruding columns 1 matches the shape of the spoke holes 103. There are multiple protruding columns 1, and several protruding columns 1 are arranged at intervals in the circumferential direction of the preform mold 400. The number of protruding columns 1 depends on the number of spoke holes on the rim, and the positions of the protruding columns 1 also correspond to the positions of the spoke holes on the rim. It can be expected that the orientation of the protruding columns 1 also extends radially towards the center of the circle or extends substantially radially with a slight eccentricity according to the weaving method of the spokes between the rim and the hub to finally form the corresponding spoke holes 103.

[0055] As Figure 4 and Figure 5 , prepare a plurality of strip-shaped reinforcing units 2, and wind the reinforcing units 2 around the outer periphery of the protruding columns 1 one by one. The plurality of reinforcing units 2 are stacked on top of each other, and most of them are staggered with each other. Finally, the reinforcing units 2 gradually enclose the basic outer contour of the spoke holes 103 around the outer periphery of the protruding columns 1. The winding of the reinforcing units 2 is also a method in which the reinforcing units 2 extend around the protruding columns 1 in a manner of avoiding the protruding columns 1 and substantially cover the outer periphery of the protruding columns 1. The reinforcing units 2 can be very close to the protruding columns 1 until they are substantially tangent to or even abut against the protruding columns 1 to more precisely enclose the shape contour of the spoke holes 103. The reinforcing units 2 can also be appropriately far away from the protruding columns 1 to supplement the gaps formed by the stacking and staggering between several reinforcing units 2.

[0056] The winding operation of the reinforcing units 2 can be realized either manually or by using an automated machine. When operating manually, the worker can consciously avoid the reinforcing units 2 covering the top of the protruding columns 1; when operating by using an automated machine, the method of numerical control programming and positioning can be used to avoid the reinforcing units 2 covering the top of the protruding columns 1. In this embodiment, as Figure 3 , the radially inward end 11 of the protruding column 1 towards the preform mold 400 is further set to a sharp shape. In this way, even if the reinforcing units 2 cover the top of the protruding column 1 during the winding process, they will be punctured by the protruding column 1 and finally like Figure 8As shown, it is pierced by the protruding post 1. In this case, the reinforcing unit 2 fits more closely to the outer periphery of the protruding post 1. Moreover, since the reinforcing unit 2 is pierced, the reinforcing fibers therein can still basically maintain continuity. The structure of the protruding post 1 with a tip is obviously very suitable for the case of winding the reinforcing unit 2 using an automated machine, because in this way, there is no need to try to avoid the winding direction directly facing the protruding post 1. However, in any case, since the reinforcing unit 2 continues to wind around the periphery of the protruding post 1 to basically cover the peripheral range of the protruding post 1, the number of reinforcing units 2 that can be pierced by the protruding post 1 is small. The tip structure of the protruding post 1 can also play a certain guiding role, making the winding of the reinforcing unit 2 smoother. In other embodiments of the protruding post 1, for example, in the case of manually winding the reinforcing unit 2, it can also be a cylindrical structure with a uniform diameter.

[0057] The preforming and shaping of the reinforcing unit 2 on the preform mold 400 can be achieved by existing means. For example, hot air can be blown onto the reinforcing unit 2 to enable it to be basically shaped on the preform mold 400. The reinforcing unit 2 in Figure 4 The illustrated embodiment can adopt a strip structure, so it can better adhere to the preform mold 400.

[0058] It can be expected that during the winding process, the reinforcing unit 2 cannot completely fill the outer peripheral space of the protruding post 1. As shown in Figure 5 the planar development view of the reinforcing unit 2 wound around the protruding post 1, the reinforcing unit 2 will leave some gaps on the outer periphery of the protruding post 1. However, during the subsequent heat curing process, due to the thermoplasticity of the reinforcing unit 2, the reinforcing unit 2 can fill these gaps. Specifically, after the reinforcing unit 2 is preformed on the preform mold 400, the reinforcing unit 2 and the preform mold 400 are separated to obtain a rim preform structure with the basic outer contour of the spoke hole 103 formed. Finally, the rim preform structure will be placed in a thermosetting mold for heat curing. As shown in Figure 10 , in the thermosetting mold 500, a pin body 600 inserted into the spoke hole formed by the surrounding of the reinforcing unit 2 is provided. The pin body 600 only needs to be positioned in the cavity of the thermosetting mold 500. Then, once the heat curing is completed, the reinforcing unit 2 can shape a complete structure of the spoke hole 103 around the pin body 600. As shown in Figure 6 the development view of the reinforcing unit 2 around the spoke hole 103 after the thermosetting of the rim 100 is shown. Some of the reinforcing units 2 will further bend and deform due to their thermoplasticity to fit the pin body, thus filling the gaps around the pin body. The reinforcing unit 2 includes at least one layer of reinforcing fibers 20, and the reinforcing fibers 20 of these bent reinforcing units 2 are distributed on the same side of the spoke hole 103 and bend away from the spoke hole 103 in a common direction. If it is Figure 8In the case where the reinforcing unit 2 shown is punctured and squeezed through, the reinforcing fibers 20 of the reinforcing unit 2 are distributed on both sides of the spoke hole 103 and bend away from the spoke hole 103 in opposite directions. It can be expected that the orientation of the pin body 600 also radially extends towards the center of the circle or extends substantially radially with a slight eccentricity according to the weaving method of the spokes between the rim and the hub to finally form the corresponding spoke hole 103.

[0059] Since the basic shape of the spoke hole 103 is formed in the preforming stage before the rim 100 is heated and cured in this embodiment, the reinforcing fibers 20 in the reinforcing unit 2 remain continuous in the longitudinal direction of the bar-shaped extension of the reinforcing unit 2, so that the ability of the edge of the spoke hole 103 to bear the axial load is effectively enhanced. If the tip structure of the convex post 1 is not used to puncture the reinforcing unit 2, the reinforcing fibers of the reinforcing unit 2 that are wound around the convex post 1 to form the spoke hole 103 structure are basically completely unbroken (ideally completely unbroken, but accidental fiber breakage in the manufacture of the reinforcing unit 2 itself cannot be excluded). In the case of using the tip structure of the convex post 1 to puncture the reinforcing unit 2, there will be a little breakage of the reinforcing fibers of the reinforcing unit 2 that are wound around the convex post 1 to form the spoke hole 103 structure. On the one hand, since the reinforcing unit 2 is squeezed through by the convex post 1, the broken reinforcing fibers 20 are very few. On the other hand, the proportion of the reinforcing unit 2 that will contact the tip of the convex post 1 is very small, so generally the reinforcing fibers of these reinforcing units 2 are still basically unbroken.

[0060] In Figure 4 In the embodiment shown, there are multiple disconnected reinforcing units 2. A single reinforcing unit 2 is U-shaped bent in a circumferential manner around the rim (or the preforming mold 400). The reinforcing unit 2 semi-surrounds the preforming mold 400 in a way that does not pass through the radially outer end of the preforming mold 400. The reinforcing unit 2 fits on the inner end of the preforming mold 400. Thus, several reinforcing units 2 can form the basic shape of a U-shaped spoke connecting portion 101 extending from the radially inner end to the radially outer end of the rim 100. In this case, the reinforcing unit 2 can be directly separated from the preforming mold 400. Figure 7 Another feasible alternative is shown. In this alternative, the length of the reinforcing unit 2A is longer. The reinforcing unit 2A continuously and completely surrounds the preforming mold 400 in a way that passes through the radially outer end of the preforming mold 400 and winds around the preforming mold 400 for multiple turns. In this case, the winding efficiency of the reinforcing unit 2A is higher, but some of the reinforcing unit 2A at the radially outer end of the preforming mold 400 needs to be removed additionally to better separate the reinforcing unit 2 from the preforming mold 400, for example, by using a cutting method to achieve the removal.

[0061] Whether it is Figure 4 the embodiment shown, or Figure 7In the alternative examples shown, the reinforcing units are all wound in a circumferential manner around the rim (or the preform mold 400). Additionally, as Figure 9 , this embodiment also proposes alternative examples with different winding directions. In this alternative example, the strip-shaped reinforcing unit 2B is wound from the outer periphery of one stud 1 to the outer periphery of another adjacent stud 1 in an "S" shape around the axis of the stud 1. After forming, that is, the strip-shaped reinforcing unit 2B is wound from the outer periphery of one spoke hole 103 to the outer periphery of another adjacent spoke hole 103 in an "S" shape around the axis of the spoke hole 103. In this solution, it is better for the stud 1 to adopt a cylindrical structure with a uniform diameter. Moreover, the reinforcing unit 2B can be curled into a rod shape before winding, or the reinforcing unit 2 forms a multi-layer structure through continuous "Z"-shaped folding so that the reinforcing unit 2B can be wound more stably around the outer periphery of the stud 1. This alternative example can form the inner circumferential end of the rim faster.

[0062] Referring to Figure 3 as shown, this embodiment further sets a groove 3 around the outer periphery of the stud 1 on the preform mold 400. Before starting the winding of the reinforcing unit 2, at least one layer of sheet-shaped reinforcing substrate 700 (such as Figure 11 ) can be laid in the groove 3. During the laying process of the reinforcing substrate 700, the stud 1 is allowed to pierce through. Alternatively, perforations can be provided on the reinforcing substrate 700 for the stud 1 to pass through. The setting of the reinforcing substrate 700 can increase the thickness at the spoke hole 103 and enhance the strength of the spoke hole 103. After the rim 100 is thermoset molded, the reinforcing substrate 700 is arranged on the side of the reinforcing unit 2 facing radially outward of the rim 100.

[0063] The strip-shaped reinforcing unit 2 can be obtained by cutting the existing pre-impregnated composite reinforcing material. For example, a strip-shaped reinforcing unit 2 is cut from a whole piece of carbon fiber cloth.

[0064] Although in the above embodiment, the reinforcing unit 2 is made of carbon fiber fabric, in the applications of other embodiments, other high-strength fiber materials that are the same or different can also be selected according to the different rim materials, such as glass fiber, aramid fiber, basalt fiber, ultra-high molecular weight polyethylene fiber (UHMWPE), and so on.

[0065] This embodiment mainly provides a forming method for the shape of the spoke connection part 101 in the peripheral area of the spoke hole 103 (stud 1). In the circumferentially spaced area between the studs 1, it can continue to be covered by the method of winding the reinforcing unit 2, or it can be covered by pasting large carbon fiber sheets. The top 102 can be formed in the existing way. Finally, the spoke connection part 101 and the top 102 are spliced and heat-cured to obtain the rim 100.

[0066] To improve the forming quality, such as Figure 12 , before winding the reinforcing unit 2, at least one layer of annular strip-shaped reinforcing bars 450 can also be laid along the inner end circumference of the preform mold 400. During the laying process of the reinforcing bars 450, the protruding posts 1 are allowed to pierce through, or alternatively, perforations can be provided on the reinforcing bars 450 for the protruding posts 1 to pass through. The reinforcing bars 450 can be provided with several layers, and the reinforcing bars 450 are also woven carbon fibers impregnated with thermosetting resin, and preferably, the weft and warp directions of the fibers form angles of +45° and -45° with the circumferential direction.

[0067] It can be seen that the orientation of the reinforcing bars 450 is very close to the orientation of the reinforcing unit 2B in the Figure 9 substitute example shown. Therefore, the reinforcing bars 450 can also be laid in the same way as the reinforcing unit 2B, that is, the reinforcing bars 450 are laid in a way that winds around the axis of the protruding post 1 from the outer circumference of one protruding post 1 to the outer circumference of another adjacent protruding post 1 along an "S" - shaped path.

[0068] According to the different strengths required for the rim, either only the reinforcing bars 450 or the reinforcing base 700 can be laid, or both the reinforcing bars 450 and the reinforcing base 700 can be laid simultaneously.

[0069] This embodiment further provides the structure of the above - mentioned rim 100. Among them, several reinforcing units 2 are stacked on top of each other in a staggered manner around the spoke holes 103, and a part of the reinforcing units 2 connected to the spoke holes 103 are combined to construct the outer contour of the spoke holes 103. The reinforcing units 2 connected to the spoke holes 103 are the reinforcing units 2 closest to the spoke holes 103 and forming the circumference of the spoke holes 103. Further, the inner sides 21 of the reinforcing units 2 connected to the spoke holes 103 are connected one by one and enclose the outer contour of the spoke holes 103. These reinforcing units 2 connected to the spoke holes 103 are tangent or substantially tangent to the spoke holes 103 (some of the arc - shaped structures of the reinforcing units 2 overlap with the edges of the spoke holes 103). The reinforcing fibers 20 remain continuous or substantially continuous in the bar - shaped length direction of the reinforcing units 2, strengthening the ability of the edges of the spoke holes to withstand axial loads. For more detailed descriptions of the reinforcing units 2 and the reinforcing fibers 20, reference can be made to the above - mentioned explanations.

[0070] Based on the structure of the above - mentioned rim 100, this embodiment further provides the structure of the above - mentioned wheel 900. Since the wheel 900 is composed of the rim 100, it has higher strength and longer service life at the spoke holes 103.

[0071] Although the present invention has been specifically shown and described in connection with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all such changes fall within the protection scope of the present invention.

Claims

1. Rim, including a spoke connection part at the radially inner end, and spoke holes are provided on the spoke connection part, characterized in that, The outer periphery of the spoke hole has strip-shaped reinforcing units, each reinforcing unit includes at least one layer of reinforcing fibers, several reinforcing units are stacked on each other in a staggered manner around the spoke hole, and at least part of the reinforcing units are combined to construct the outer contour of the spoke hole.

2. The rim according to claim 1, characterized in that, The reinforcing fibers are continuous or substantially continuous in the strip length direction of the reinforcing unit.

3. The rim according to claim 1, characterized in that, At least part of the reinforcing units are tangent to the spoke hole.

4. The rim according to claim 1, characterized in that, In the strip length direction of the reinforcing unit, the reinforcing unit extends from the outer periphery of one spoke hole to the outer periphery of another adjacent spoke hole in an "S"-shaped path around the axis of the spoke hole.

5. The rim according to claim 1, characterized in that, In the strip length direction of the reinforcing unit, the reinforcing unit bends in a circumferential direction around the rim.

6. The rim according to claim 1, characterized in that, The reinforcing fibers of at least one reinforcing unit are distributed on the same side of the spoke hole and bend away from the spoke hole in a common direction, or the reinforcing fibers of at least one reinforcing unit are distributed on both sides of the spoke hole and bend away from the spoke hole in opposite directions.

7. The rim according to claim 1, characterized in that, The inner sides of the reinforcing units in contact with the spoke hole are connected one by one to enclose the outer contour of the spoke hole.

8. The rim according to claim 1, characterized in that, At least one layer of sheet-shaped reinforcing base is also laid on the side of the reinforcing unit facing radially outward of the rim.

9. A wheel, comprising a rim, a hub and spokes connecting the rim and the hub, characterized in that, The rim is the rim according to any one of claims 1-8, the spoke extends through the spoke hole, and the spoke is connected to the spoke connection part of the rim through a spoke joint.

10. A method for forming spoke holes on a rim, characterized in that, Comprising: Providing a convex column matching the shape of the spoke hole, Winding the strip-shaped reinforcing unit around the outer periphery of the convex column. During the winding process, the reinforcing unit gradually encloses the convex column and roughly constructs the outer contour of the spoke hole, Separating the convex column and the reinforcing unit.

11. The method for forming spoke holes on a rim according to claim 10, characterized in that, The convex column is arranged on a preforming mold, the preforming mold is of an annular or arc-shaped structure, several convex columns are fixedly arranged at intervals in the circumferential direction of the preforming mold at the radially inner end of the preforming mold, and the convex column extends roughly radially inward of the preforming mold.

12. The method for forming spoke holes on a rim according to claim 11, characterized in that, The radially inward end of the convex column is set to a sharp shape.

13. The method for forming spoke holes on a rim according to claim 11, characterized in that, A groove is provided on the preforming mold around the outer periphery of the convex column, and further includes the step of laying at least one layer of sheet-shaped reinforcing base in the groove before winding the reinforcing unit.

14. The method for forming spoke holes on a rim according to claim 11, characterized in that, Further includes the step of laying at least one layer of annular strip-shaped reinforcing strip along the inner end circumference of the preforming mold before winding the reinforcing unit.

15. The method for forming spoke holes on a rim according to claim 11, characterized in that, The reinforcing unit bends in a circumferential direction around the preforming mold, and: The reinforcing unit semi-surrounds the preforming mold in a way that does not pass through the radially outer end of the preforming mold; or, the reinforcing unit completely surrounds the preforming mold in a way that passes through the radially outer end of the preforming mold, and further includes the step of removing part of the reinforcing unit at the radially outer end of the preforming mold after the winding of the reinforcing unit is completed.

16. The method for forming spoke holes on a rim according to claim 15, characterized in that, The reinforcing unit is a strip structure and adheres to the surface of the preforming mold.

17. The method for forming spoke holes on a rim according to claim 11, characterized in that, The reinforcing unit winds from the outer periphery of one convex column to the outer periphery of another adjacent convex column in an "S"-shaped path.

18. The method for forming spoke holes on a rim according to claim 10 or 17, characterized in that, The reinforcing unit is curled into a rod shape before winding.

19. The method for forming spoke holes on a rim according to claim 10, characterized in that, Further includes the step of thermosetting and forming the rim. In the thermosetting mold, a pin body is provided and inserted into the spoke hole formed by enclosing the reinforcing unit.

20. A preform die for forming spoke holes on a rim, characterized in that, The preforming mold is of an annular or arc-shaped structure, several convex columns matching the shape of the spoke hole are fixedly arranged at intervals in the circumferential direction of the preforming mold at the radially inner end of the preforming mold, and the convex column extends roughly radially inward of the preforming mold.

21. The preforming die for forming spoke holes on a rim according to claim 20, wherein, The radially inward end of the convex post towards the preform mold is set to a sharp shape.

22. The preforming die for forming spoke holes on a rim according to claim 20, characterized in that, A groove surrounding the outer periphery of the convex post is provided on the preform mold.

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