TWM445546U - Bicycle crank - Google Patents

Description

Bicycle crank

The present invention relates to a bicycle component, and more particularly to a bicycle crank having a cage skeleton structure.

The traditional bicycle crank is generally made of metal materials such as aluminum alloy or alloy steel, which results in a heavier weight of the crank. It is difficult to meet the growing demand for lightweight bicycles. Therefore, the relevant developers have developed and designed such as TW Bulletin No. 582360. And the bicycle cranks formed by the carbon fiber composite material disclosed in the TW publication No. 503909, and the cranks are mainly made of carbon fiber to cover the two metal joint blocks and form a handle body between the two joint blocks. The early carbon fiber composite cranks are respectively connected with the pedals and the gear plate by the metal joint blocks at the two ends, and the middle handle portion is overmolded with a light weight composite material, thereby reducing the overall weight of the crank. Effect.

The entire handle body of the carbon fiber composite crank is composed of a carbon fiber composite material, which inevitably leads to deterioration of the structural strength of the crank, and may be caused by the pedaling force during riding, the upside vibration of the road surface, or accidental collision. The factor is broken and the damage is broken. Therefore, the relevant industry further develops and designs a composite crank having a metal core material such as TW certificate number M355892, TW certificate number M296826, and TW certificate number M286179, thereby improving the structural strength of the crank. However, embedding a metal core material inside the composite crank increases the weight of the crank, and it is difficult to give full play to the lightweight characteristics of the composite crank.

In order to solve the problems and limitations of the existing bicycle composite cranks regarding light weight and structural strength, the main purpose of this creation is to propose a bicycle crank with a cage skeleton structure, which is matched with two internal embedded parts, with carbon fiber. The composite yarn is wound inside the crank to form a cage-shaped skeleton, and the cladding body is covered with a carbon fiber composite cloth to form a bicycle crank capable of greatly improving the structural strength by the cage skeleton.

The present invention solves the bicycle crank proposed by the prior art problem, comprising: two joint blocks, each of which is a metal member and disposed opposite to the two ends of the crank; and two embedded members, each of which is of a light elongated structure and parallel side by side Between two joint blocks; a cage-shaped skeleton, which is a skeleton structure formed by winding a carbon fiber composite yarn material to join the joint blocks and the inner embedded members; and a covering body, which is made of a carbon fiber composite cloth material A covering structure that is coated on each of the bonding blocks, the respective embedded members, and the outer portion of the cage-shaped skeleton and molded and hardened.

The bicycle crank, wherein the cage skeleton comprises a ridge strip, a ring frame and a plurality of rib rings connecting the ridge strip and the ring frame; the ridge strip is sandwiched between the two embedded parts and two Each end of the end is connected with a set of ferrules disposed on the corresponding joint block; the ring frame is wrapped around the outer edge of each of the joint blocks and the inner embedded parts and partially overlapped with the ferrule; each rib ring system is spaced apart Winding on the two embedded members and tightening the ridge strips and the ring frame that are relatively staggered.

The bicycle crank, wherein the embedded member is disposed at a plurality of intervals on the surface A plurality of beam rims, each rib ring bundled to each corresponding beam recess.

In the bicycle crank, the binding block integrally protrudes toward the middle of the crank to form a positioning plate having a teardrop shape and a polygonal kneading surface is formed on the circumferential surface.

The enhancements to the technical means proposed by this creation include:

1. The cage-shaped skeleton of this creation is similar to the design of the human skeleton, and the structure can provide the crank with sufficient and good structural strength, so that the lightweight characteristics of the composite crank can be fully exerted.

2. The two embedded parts of the creation may be various lightweight components such as foamed elastic strips or plastic hollow strips, which can further reduce the overall weight of the crank and improve the elasticity of the crank.

3. This creation has multiple bundles of concave edges at the interval of the embedded parts, which can provide the rib rings of the carbon fiber composite yarns to form the cage-shaped skeleton, and improve the convenience and stability of the cage-shaped skeleton processing.

4. The creation of the metal joint block is provided with a substantially water-dropping positioning plate and a polygonal card surface on the circumferential surface, which can greatly improve the structural strength and durability of the metal joint block embedded at both ends of the crank.

In order to understand the technical features and practical functions of the present invention in detail, and in accordance with the contents of the specification, further description will be made in detail with reference to the preferred embodiment shown in the following figure: The preferred embodiment includes, as shown in FIG. 1 to FIG. 4 , a bonding block 10A, 10B made of a metal material, and a pair of embedded components 20 disposed side by side between the two bonding blocks 10A, 10B. a cage-shaped bobbin 30 for winding the respective binding blocks 10A, 10B and each of the embedded members 20, and a covering body 40 covering the bonding blocks 10A, 10B, the embedded member 20 and the cage-shaped skeleton 30; wherein: As shown in FIG. 1 and FIG. 2, the two joint blocks 10A, 10B are made of aluminum alloy or alloy steel, and are respectively located at the two ends of the crank for use with the pedal and the gear plate. For the connection, the size of the joint block 10A is smaller than the size of the joint block 10B; each of the joint blocks 10A, 10B is integrally provided with a joint hole 11 at an intermediate position, and is integrally convexly disposed toward the middle direction of the crank. The positioning plate 12 having a drop shape and having an appropriate length and thickness, and a polygonal kneading surface 13 formed on the circumferential surface of each of the bonding blocks 10A and 10B can prevent each combination by the design of the positioning plate 12 and the kneading surface 13 The blocks 10A, 10B are rotated or turned relative to the crank, and the assembly strength and load capacity of each of the joint blocks 10A, 10B embedded in the crank are greatly improved.

As shown in FIG. 2 and FIG. 3, the two embedded members 20 are in an elongated configuration and are arranged side by side in parallel between the two coupling blocks 10A, 10B, thereby being embedded in the inside of the handle body of the crank, and along the In the extending direction of the crank, a plurality of groove-shaped recessed edges 21 are formed on the surface of each of the embedded members 20; the embedded member 20 may be a foamed elastic strip made of a foamed material or plastic. Various lightweight components such as hollow strips made of materials, thereby further reducing the overall weight of the crank and improving the elasticity of the crank. In the preferred embodiment as shown, the embedded member 20 is a foamed elastic strip. .

As shown in FIG. 2 and FIG. 3, the cage-shaped skeleton 30 is a cage-shaped skeleton structure formed by winding a carbon fiber composite yarn material to join the joint blocks 10A, 10B and the respective embedded members 20, and includes a ridge 31 and a ring. Box 32 and most a rib 33 connecting the ridge strip 31 and the ring frame 32; wherein the ridge strip 31 is located at a center line position and sandwiched between the two embedded members 20, and extends at both ends of the ridge strip 31 Connecting a set of ferrules 311 disposed on the corresponding joint blocks 10A, 10B; the ring frame 32 is wrapped around the outer edges of the joint blocks 10A, 10B and the inner embedded members 20, and the ring frame 32 and the two The ferrules 311 are wound together around the outer periphery of each of the joint blocks 10A, 10B; the ribs 33 are respectively spaced around the positions of the respective concave edges 21 of the embedded members 20 and the bundled links are relatively staggered. The ridge strip 31 and the ring frame 32 are passed, and each rib ring 33 can obtain a good positioning setting effect by using the corresponding beam concave edge 21; thereby the ridge strip 31, the ring frame 32 and the rib ring 33 is formed inside the crank to form the cage skeleton 30.

As shown in FIG. 3 to FIG. 5, the covering body 40 is coated with a carbon fiber composite cloth on each of the bonding blocks 10A, 10B, the inner embedded members 20, and the outer portion of the cage-shaped skeleton 30, and is molded and hardened. The cladding structure is used to form a new type of bicycle crank having a cage skeleton as shown in FIG.

Referring to FIG. 6 and FIG. 2 and FIG. 3, the manufacturing process of the preferred embodiment of the present invention generally includes: first preparing two bonding blocks 10A, 10B and two embedded members 20; and then according to the size of the crank The two bonding blocks 10A, 10B are arranged at intervals in the opposite direction of the positioning plate 12, and then the two bonding blocks 10A, 10B are wound and joined by a carbon fiber composite yarn to form a ridge 31 at the center line position of the crank; 20 is placed on both sides of the ridge strip 31 in a parallel manner; then a carbon fiber composite yarn is wound around the outer sides of the two joint blocks 10A, 10B and the two embedded members 20 to form a ring frame 32; The positions of the respective concave edges 21 of the two embedded members 20 are wound around the carbon fiber composite yarn to form a plurality of rib rings 33, and the The ridge strip 31, the ring frame 32 and the rib rings 33 are joined to form a cage-shaped cage-shaped skeleton 30 structure; then, the carbon fiber composite cloth is coated on each of the joint blocks 10A, 10B, the embedded parts 20 and the The outside of the cage skeleton 30 is placed in a molding die by pressure heating and hardening molding, and finally, through the reaming, rounding, grinding and painting, and the like, the bicycle crank can be made as shown in FIG.

In the present invention, a cage-shaped skeleton 30 is formed in the inside of the crank by winding a carbon fiber composite yarn, and the positioning plate 12 and the kneading surface 13 of the bonding blocks 10A and 10B are designed to obtain the crank after molding. With sufficient structural strength and the use of the lightweight embedded member 20 embedded in the interior, the overall weight and good elasticity of the crank can be further reduced, and the structural strength and lightweight characteristics of the composite crank can be greatly improved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Anyone having ordinary knowledge in the technical field may use the present invention without departing from the technical features of the present invention. Equivalent embodiments of the local changes or modifications made by the technical content disclosed herein are still within the scope of the features of the present invention.

10A, 10B‧‧‧ combination block

11‧‧‧Combination hole

12‧‧‧ Positioning board

13‧‧‧Car face

20‧‧‧ embedded parts

21‧‧‧beam recess

30‧‧‧Cage skeleton

31‧‧‧ ridge strips

311‧‧‧ ferrules

32‧‧‧ ring frame

33‧‧‧ Ribs

40‧‧‧ Covering body

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a preferred embodiment of the present invention.

2 is a schematic view showing the arrangement of the joint and the embedded member of the preferred embodiment of the present invention.

3 is a schematic view showing the combined arrangement of the joint, the embedded member and the cage skeleton of the preferred embodiment of the present invention.

Figure 4 is a schematic cross-sectional view of a preferred embodiment of the present invention.

Figure 5 is a schematic cross-sectional view of a preferred embodiment of the present invention.

Figure 6 is a schematic diagram showing the manufacturing process of the preferred embodiment of the present invention.

10A, 10B‧‧‧ combination block

11‧‧‧Combination hole

12‧‧‧ Positioning board

13‧‧‧Car face

20‧‧‧ embedded parts

21‧‧‧beam recess

30‧‧‧Cage skeleton

31‧‧‧ ridge strips

311‧‧‧ ferrules

32‧‧‧ ring frame

33‧‧‧ Ribs

Claims (6)

A bicycle crank comprising: two joint blocks, each of which is a metal member and disposed opposite to the two ends of the crank; the two embedded members are all of a light elongated structure and are arranged side by side in parallel between the two joint blocks a cage-shaped skeleton which is a skeleton structure formed by winding a carbon fiber composite yarn material to join the joint blocks and the respective embedded members, and a coating body coated with the carbon fiber composite cloth material in each of the joint blocks, each An embedded member and a cladding structure of the outer portion of the cage-shaped skeleton and molded and hardened. The bicycle crank according to claim 1, wherein the cage skeleton comprises a ridge strip, a ring frame and a plurality of rib rings connecting the ridge strip and the ring frame; the ridge strip is sandwiched between the two And a plurality of ferrules disposed on the opposite joint block between the two embedded parts; the ring frame is wrapped around the outer edge of each of the joint blocks and the inner embedded parts and partially overlaps the ferrule The ribs are respectively wound around the two embedded members and are tightly coupled to the ridge strip and the ring frame which are relatively staggered. The bicycle crank according to claim 2, wherein the embedded member is provided with a plurality of beam concave edges at surface intervals, and the rib rings are fastened to the corresponding beam concave edges. The bicycle crank according to claim 3, wherein the embedded member is a foamed elastic strip. The bicycle crank described in 3 or 4, wherein The bonding block integrally protrudes toward the middle of the crank to form a positioning plate and forms a polygonal locking surface on the circumferential surface. The bicycle crank according to claim 5, wherein the positioning plate is in the shape of a drop.