TWI566962B - Bicycle low air barrier - Google Patents

Description

Bicycle low wind resistance spoke

The present invention relates to a spoke, and more particularly to a spoke for a bicycle having a low wind resistance.

The existing low-resistance spokes can be divided into one-piece and multi-piece according to the number of components.

A one-piece spoke means that the spoke is made in one piece, for example, in U.S. Patent No. 7,928,885 B2. The spoke is formed by molding a composite material to reduce the wind resistance, and the two ends are respectively clamped in a clamping groove of a wheel frame and a clamping groove of a flower hub, and then fixed by gluing, although high strength and quality The light characteristics, but the tension can not be adjusted, and must be assembled with the wheel frame and the flower hub to reduce the shortcomings of the assembly flexibility. In addition, since the middle section of the spoke is a low wind resistance airfoil, and the two end sections are twisted into other shapes to respectively clamp the clamping groove of the wheel frame and the flower hub, the surface shape of the spoke is complicated, and further The process is cumbersome and difficult.

The multi-piece spoke includes at least one spoke body having a low wind resistance, and two connecting members respectively connected to the two ends of the spoke body and respectively connecting a wheel frame and a flower hub, as in U.S. Patent No. 5,350,221 and Republic of China Patent No. M358066. The aforementioned spokes are locked by one of them The connection is connected to the wheel frame to adjust the spoke tension and is more flexible in the assembly procedure. However, the spoke body is also manufactured in a solid or hollow shape by integral molding. Since the middle section of the spoke body is a low wind resistance airfoil, the connecting members are connected so that the ends of the spokes are twisted into a circular shape. Therefore, the shape and surface of the spoke body are complicated, which makes the process cumbersome and difficult.

A multi-piece spoke as disclosed in the European Patent No. 1930146 A1 further comprises a winding member surrounding the spoke body as compared to the aforementioned multi-piece spoke. The outer shape of the winding member wound around the spoke body changes with the appearance of the spoke body, thereby providing low wind resistance characteristics. However, winding and wrapping the spoke body means that the spokes as a whole have a solid structure, and although they have structural strength, they have the disadvantage of being incapable of being lightweight and complicated in the manufacturing process of the spokes. In addition, after the winding member is wound into a plurality of layers, the wind-cut side edge of the spoke is arcuate, and the utility of the low wind resistance is lost.

Accordingly, it is an object of the present invention to provide a bicycle low-resistance spoke that simplifies the process and is both lightweight and simple to assemble.

Therefore, the low-resistance spoke of the bicycle of the present invention comprises a main structure body and a casing unit mounted on the main structure body.

The main structure body comprises a rod member having a circular cross section and extending in the axial direction and having a composite material, and a first connecting member and a second connecting member respectively connected to opposite ends of the rod member. The outer casing unit includes a plurality of outer casing members extending in the axial direction and connected around the outer peripheral side of the rod member, and one of the outer casing sides of the outer casing members is defined to have at least one cut The outer circumferential surface of the low wind resistance section having a non-circular shape and an inner circumferential surface defined by the inner casing surfaces of the outer casing members.

The invention has the advantages that the combination of the assembly of the main structural body and the outer casing members not only makes the spokes lighter, but also simplifies the spokes process, and is more flexible and convenient in assembly.

1‧‧‧Main structure

11‧‧‧ rods

12‧‧‧ First link

121‧‧‧First shaft hole

122‧‧‧First Fixed Department

123‧‧‧ first joint

124‧‧‧ spherical end

13‧‧‧Second link

131‧‧‧Second shaft hole

132‧‧‧Second fixed department

133‧‧‧Second junction

134‧‧‧ cutting plane

2‧‧‧Shell unit

21‧‧‧Sheet parts

211‧‧‧Shell connection

212‧‧‧Outer arc

213‧‧‧ inner arc

22‧‧‧ outer perimeter

221‧‧‧Low wind resistance

23‧‧‧ inner circumference

231‧‧‧bar joints

232‧‧‧First end connection

233‧‧‧second end connection

24‧‧‧ cavity

E1‧‧‧ first imaginary plane

E2‧‧‧second imaginary plane

Other features and effects of the present invention will be apparent from the following description of the drawings. FIG. 1 is an exploded perspective view showing a first embodiment of the bicycle low wind resistance spoke of the present invention; 3 is a partial cross-sectional view taken along line III-III of FIG. 2; FIG. 4 is a partial cross-sectional view taken along line IV-IV of FIG. 2; and FIG. A partial cross-sectional view of line VV in FIG.

Referring to Figures 1 and 2, a first embodiment of the bicycle low-resistance spoke of the present invention comprises a main structure 1 and a casing unit 2 mounted on the main structure 1.

The main structure 1 includes a rod member 11 having a circular cross section and extending in the axial direction and having a composite material, and a first connecting member 12 and a second connecting member 13 respectively connected to opposite ends of the rod member 11. The first connecting member 12 has a first shaft hole 121 for inserting one end portion of the rod member 11 , a first fixing portion 122 away from the rod member 11 , and a first fixing portion The first joint portion 123 on the inner side of the portion 122. A spherical end 124 is formed on the outer side of the first fixing portion 122. The spherical end 124 can be engaged on a spoke hole of a flower hub (not shown), and the first joint portion 123 is frustoconical and is provided for The outer casing unit 2 is adhered at one end. The second connecting member 13 has a second shaft hole 131 for the other end of the rod member 11 , a second fixing portion 132 away from the rod member 11 , and a second fixing portion 132 . The second joint portion 133. The outer peripheral surface of the second fixing portion 132 is formed with a thread for a bolt (not shown) to be locked on a wheel frame (not shown), and the second joint portion 133 has two opposite cutting planes 134. The other end of the outer casing unit 2 is adhered.

Since the rod member 11 is a round rod made of a composite material, the manufacturing process is simple and has high strength supportability. By connecting the first connecting member 12 and the second connecting member 13 in an embedded manner, the assembling procedure of the main structural body 1 is effectively simplified. The composite material can be a carbon fiber reinforced plastic. If it is pre-impregnated with a long-fiber fiber cloth, it can be wound into a solid round rod. If the medium-short fiber is pre-mixed into the plastic material, it can be shot or poured into a solid round rod.

With reference to FIG. 3, defining a first imaginary plane E1 and a second imaginary plane E2 that are orthogonal to each other and pass through the axis of the rod member 11, the outer casing unit 2 includes two axially extending and mutually symmetrical to the first The imaginary plane E1 is made of a shell member 21 of a composite material. Each of the outer casing members 21 has two shell connecting portions 211 located on the first imaginary plane E1 and symmetrical to the second imaginary plane E2. The composite material can be a carbon fiber reinforced plastic. It is worth mentioning that the material of the outer casing parts is not limited to the above, and can also be a plastic material.

The outer casing members 21 are attached to the shell connecting portions 211 corresponding to each other by gluing. It is to be noted that the housing connecting portions 211 of the housing members 21 that are corresponding to each other can also be connected in a fitting manner, that is to say, the housing connecting portions 211 corresponding to each other have a mutual fit. Chimeric structure. The outer casing of each outer casing member 21 has an outer arc segment 212 which is symmetrical to the first imaginary plane E1 and which together forms a low wind resistance section 221 which is non-circular in cross section and conforms to the air guiding shape. . The inner casing of each outer casing member 21 has an inner arc segment 213 opposite the outer outer arc segment 212 and centrally passing through the second imaginary plane E2. The center of each inner arc segment 213 passes through the second imaginary plane E2 and forms a rod connecting portion 231 which is in contact with the outer peripheral surface of the rod member 11, and each inner arc segment 213 has a curvature greater than the radius of the rod member 11 from the center. Extending toward the shell connecting portions 211. The rod connecting portions 231 are glued to the rods 11 .

The outer casing unit 2 further includes an outer peripheral surface 22 formed by the outer casing faces of the outer casing members 21, and an inner peripheral surface 23 formed by the inner casing faces of the outer casing members 21. A cavity 24 is formed between the inner circumferential surface of the outer casing unit 2 and the outer circumferential surface of the rod member 11, that is, the outer casing unit 2 is not completely surrounded by the outer circumferential surface of the rod member 11, which not only reduces the material cost, but also Lightweight can be achieved. The inner peripheral surface 23 of the outer casing unit 2 further has a first end connecting portion 232 (see FIG. 4) contacting the first joint portion 123, and a second end connecting portion 233 contacting the second joint portion 133. (See Figure 5).

Referring to FIG. 2 and FIG. 4 , the outer peripheral surface 22 of the outer casing unit 2 is adjacent to the first joint portion 123 and has a circular curved surface whose radius is substantially equal to the radius of the first fixed portion 122 , so as to be opposite to the outer peripheral surface of the first fixing portion 122 . Continuous Connect.

Referring to FIG. 2 and FIG. 5, the second end connecting portion 233 of the outer casing unit 2 is a plane parallel to the first imaginary plane E1, and the planes are respectively glued with the two cutting planes 134 on the second joint portion 133. connection. The outer peripheral surface 22 of the outer casing unit 2 is continuously connected to the outer peripheral surfaces of the second joint portion 133 and the second fixing portion 132 adjacent to the second joint portion 133 and the second fixing portion 132.

It is to be noted that the outer casing unit 2 and the main structural body 1 may be glued to the outer peripheral surface of the rod member 11 only by the rod connecting portions 231, and the outer casing unit 2 and the main structural body One of the remaining contact points can be selectively glued to increase the flexibility of the assembly.

However, the combination design of the main structural body 1 and the outer casing unit 2 of the low-resistance strip of the bicycle of the present invention has an advantage over the conventional spokes in that the supporting strength of the spoke is provided by the rod-shaped rod member 11, Not only the process is simple, but also has high tensile properties, and the combination of the first and second connecting members 12 and 13 can effectively simplify the assembling process of the main structural body 1. The outer casing unit 2 is mainly used for forming a low wind resistance, and does not need to emphasize its strength. The material may be plastic or composite material, and the two identical outer casing members 21 are arcuate and thin shell-shaped open structures, regardless of molding, Lamination or injection molding is easier than conventional processes. Moreover, the joint structure of the main structural body 1 and the outer casing members 21 is elasticized to improve the assembly flexibility, and the combined spokes include two cavities 24, which not only exhibits light weight but also materials compared to conventional solid structures. The cost can be reduced, so the object of the present invention can be achieved. In addition, even if the main structural body 1 has been first assembled with the wheel frame and the flower hub, the outer casing unit 2 can be retrofitted to the main structural body 1 afterwards. It is not necessary to install the invention at the spokes manufacturing plant, providing a more flexible choice for the wheel set plant, the group car plant, or the consumer.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and patent specification content of the present invention, All remain within the scope of the invention patent.

1‧‧‧Main structure

11‧‧‧ rods

12‧‧‧ First link

121‧‧‧First shaft hole

122‧‧‧First Fixed Department

123‧‧‧ first joint

124‧‧‧ spherical end

13‧‧‧Second link

131‧‧‧Second shaft hole

132‧‧‧Second fixed department

133‧‧‧Second junction

134‧‧‧ cutting plane

2‧‧‧Shell unit

21‧‧‧Sheet parts

211‧‧‧Shell connection

212‧‧‧Outer arc

213‧‧‧ inner arc

Claims (5)

A bicycle low-resistance spoke includes: a main structural body comprising a rod member having a circular cross section and extending in the axial direction and having a composite material; and a first connecting member and a first connecting member respectively connected to opposite ends of the rod member a second connecting member having a first fixing portion away from the rod and a first joint portion inside the first fixing portion, the second connecting member having a second fixing away from the rod And a second joint portion located inside the second fixing portion; and a casing unit mounted on the main structure body, and including a plurality of axially extending portions connected and surrounding the outer peripheral side of the rod member a housing member, an outer peripheral surface defined by the mating surfaces of the outer casing members, and an inner peripheral surface defined by the inner casing surfaces of the outer casing members, each outer casing member having two axial extensions and a shell connecting portion for connecting the other outer casing members, wherein the adjacent outer casing members are gluingly connected to the shell connecting portions corresponding to each other, the outer peripheral mask having a low wind resistance section having a non-circular cross section, the inner peripheral surface and the inner peripheral surface The outer peripheral surface of the rod Into two cavities and having an axially extending at least along the connecting portion and the rod member in contact with the lever member and the two are in contact is connected to an end portion of the first binding portion and the second portion of the binding. The bicycle low-resistance spoke according to claim 1, wherein the outer casing unit comprises two outer casing members defining a first imaginary plane and a second imaginary plane orthogonal to each other and passing through the rod axial center, each outer casing The shell connecting portions of the piece are located in the first imaginary plane and are symmetrical to the second imaginary plane, and the outer shell surfaces of the outer shell members each have an outer arc segment, and the outer arc segments Symmetrical to the first imaginary plane and jointly forming the low wind resistance section, the inner casing surfaces of the outer casing members each have an inner arc segment opposite to the outer arc segment thereof, and the center of the inner arc segment passes through the second imaginary plane And forming the rod connecting portion, and the inner arc segment extends from the center toward the shell connecting portions by a curvature greater than a radius of the rod. The bicycle low-resistance spoke according to claim 1, wherein the first connecting member further has a first shaft hole for the rod member, and the second connecting member further has a first portion for the rod member to be embedded. Two shaft holes. The bicycle low-resistance spoke according to claim 3, wherein the end joints of the inner circumferential surface are respectively glued to the first joint portion and the second joint portion. The bicycle low-resistance spoke according to claim 1, wherein the outer casing member is made of a composite material.