TWM600723U - Composite crank - Google Patents

Abstract

A composite crank includes a first metal piece, a second metal piece, a socket space, an outer fiber piece, and a reinforcing fiber piece. The first metal piece and the second metal piece are arranged at intervals to define a set The connecting space is formed in the composite crank and located between the first metal piece and the second metal piece. The outer fiber piece covers the first metal piece, the second metal piece, and the socket space, and the reinforcing The fiber piece is arranged between the first metal piece and the second metal piece, and includes two bonding sections respectively attached to two opposite inner surfaces of the outer fiber piece along the thickness direction of the composite fiber piece, and are arranged on the The space is sleeved and a rib wall of the two bonding sections is connected; the composite crank has the advantages of light weight and can improve the structural strength in the thickness direction.

Description

Compound crank

This model relates to a crank used for bicycles, in particular to a crank of composite material.

Bicycle design usually uses a rigid structure frame to connect the front and rear wheels in series, and the crank is connected between the sprocket and the pedal, and the force of the user's pedal is transmitted to the rear wheel through the sprocket and chain. As a structural component for power transmission, bicycle cranks are often made of steel or alloys. In order to ensure that both the pedal end and the sprocket end of the crank can pivot smoothly, both ends of the crank must have a strong pivot structure to withstand the torsional load from the pedal end and the sprocket end at the same time. In addition, in order to reduce the weight of the vehicle body, fiber materials are used in the manufacture of bicycle frames. However, fiber materials are not conducive to the production of pivotal structures that can withstand high torsion forces. Therefore, bicycle cranks are made of composite materials of metal and fiber.

The main purpose of the present invention is to provide a composite crank and a manufacturing method thereof. The composite crank has the advantages of light weight and can improve the structural strength of the composite crank in the thickness direction.

In order to achieve the above-mentioned purpose, the composite crank proposed by the present invention includes: A first metal piece, including A first contact hole portion having a first contact hole; and A first connecting section extending from the first hole portion and forming a first opening at an end away from the first hole portion; A second metal piece is arranged at intervals from the first metal piece to define a socket space formed in the composite crank and located between the first metal piece and the second metal piece, the second metal piece including A second contact hole portion having a second contact hole; and A second connecting section extending from the second connecting hole portion and forming a second opening at an end away from the second connecting hole portion, and the socket space communicates with the first opening and the second opening; An outer fiber piece covering the first metal piece, the second metal piece, and the socket space; and A reinforcing fiber piece, extending along a connecting direction of the first metal piece and the second metal piece, is disposed between the first metal piece and the second metal piece, and includes Two bonding sections are respectively bonded to two opposite inner surfaces of the outer fiber member along the thickness direction of the composite crank; and A rib wall is arranged in the socket space and connects the two bonding sections.

The invention reduces the weight of the composite crank by covering the first metal part and the second metal part by the outer fiber part, and uses the reinforcing fiber part arranged in the socket space to increase the thickness direction rigidity of the composite crank, and make the The novel composite crank has the advantages of light weight and can improve the structural strength of the composite crank in the thickness direction.

Please refer to Figure 1, Figure 2, Figure 3A/3B and Figure 4A/B, the first preferred embodiment of the composite crank 1 of the present invention, which is suitable for a bicycle, for the convenience of description, each drawing defines a long axis X, a minor axis Y, and a reference axis Z or the thickness direction of the composite crank 1, the major axis X and minor axis Y are perpendicular to the reference axis Z or the thickness direction of the composite crank 1, and the minor axis Y is perpendicular to the major axis X. For ease of description, each embodiment of the present invention takes a flat composite crank 1 as an example; in other embodiments of the present invention, the upper surface, lower surface, and side surface of the composite crank 1, as well as all elements and structures, may be along Two or three directions of the reference axis Z, the major axis X, and the minor axis Y extend at the same time, so that the composite crank 1 has curvature, twist, or deflection. Therefore, a straight crank with a single thickness is not necessarily limited.

The composite crank 1 includes a first metal part 10, a second metal part 20, a socket space, an outer fiber part 40, and one or more reinforcing fiber parts 30/30a/30b. The composite crank 1 mainly extends along the long axis X. The first metal piece 10 and the second metal piece 20 are spaced apart and arranged at intervals, and a socket space S is defined between the first metal piece 10 and the second metal piece 20, The outer fiber member 40 covers the outer circumferences of the first metal member 10, the second metal member 20 and the socket space S, and the reinforcing fiber member 30 penetrates the socket space S longitudinally and connects the two opposite inner surfaces of the outer fiber member 40 . The long axis X is also called the connection direction of the first metal piece 10 and the second metal piece 20, the short axis Y is called the width direction of the composite crank 1, and the reference axis Z is called the thickness direction of the composite crank 1. The composite crank 1 is mainly used to improve the structural strength of the reference axis Z direction or the thickness direction of the composite crank 1.

The first metal member 10, for example, may be an aluminum member, and includes a first connecting hole portion 11 and a first connecting section 13. The first connecting hole portion 11 has a wavy toroidal hole wall and defines a first connecting hole 110. A connecting hole 110 extends along the reference axis Z direction or the thickness direction of the compound crank 1, and the first connecting hole 11 is used for the tee or five-way wheel shaft at the junction of the bicycle down tube, chainstay and/or seat tube Connection, in this embodiment, the first connection hole 110 is a through hole, but the first connection hole 110 can also be a blind hole, or a combination of a partial through hole and a blind hole; the first connection section 13 is formed by the first connection hole 11 extends, for example, can extend along the long axis X direction, and form a first opening 132 at an end away from the first hole portion 11, and the first connecting section 13 has a first width D1 extending along the short axis Y direction.

The second metal piece 20 and the first metal piece 10 are arranged at intervals to define the socket space S by their outer profile. The second metal piece 20 and the first metal piece 10 may be arranged at intervals along the long axis X direction, for example, the second metal piece 20 It can be an aluminum piece. The second metal piece 20 includes a second hole portion 21 and a second connecting section 23. The second hole portion 21 defines a second hole 210, which is along the reference axis Z Extending in the direction or thickness direction of the compound crank 1, the second hole portion 21 is used to connect with the pedal of the bicycle. In this embodiment, the second hole 210 is a through hole, and the second hole 210 can also be set as a Blind hole; the second connecting section 23 extends from the second hole portion 11, for example, can extend along the long axis X direction toward the first metal piece 10, and at one end away from the second hole portion 21 and adjacent to the first metal piece 10 A second opening 232 is formed, and the second connecting section 23 has a second width D2 extending along the short axis Y direction.

The socket space S is formed in the composite crank 1, and is located between the first metal piece 10 and the second metal piece 20, and communicates with the first opening 132 and the second opening 232; preferably, the first connecting section 13 It further includes a first containing chamber 131 formed in the first connecting section 13 and communicating with the first opening 132. The outer periphery of the first containing chamber 131 forms a first connecting peripheral wall 133. The chamber 131 communicates with the socket space S through the first opening 132; the second connecting section 23 further includes a second chamber 231 formed in the second connecting section 23 and communicating with the second opening 232, In addition, a second connecting peripheral wall 233 is formed around the outer periphery of the second chamber 231, and the second chamber 231 communicates with the sleeve space S through the second opening 232.

The outer fiber member 40 can be a resin prepreg made of carbon fiber, glass fiber or other fiber materials (fiber sheet), which is wrapped around the first metal member 10, the second metal member 20, and the entire outer periphery of the sleeve space S . The reinforcing fiber parts 30/30a/30b shown in FIGS. 3A/3B and 4A/4B can be carbon fiber, glass fiber or other fiber material (fiber sheet) resin prepregs, one or more reinforcing fiber parts 30/ 30a/30b are all arranged between the first metal piece 10 and the second metal piece 20, and the reinforcing fiber piece 30/30a/30b includes two bonding sections 33/33a/33b and a rib wall 31/31a/31b. The joint sections 33/33a/33b are respectively attached to the two opposite inner surfaces of the outer fiber member 40 along the reference axis Z direction or the thickness direction of the composite crank 1, and the ribs 31/31a/31b are arranged in the sleeve space S and connect the two stickers. Combine section 33/33a/33b. In different embodiments, the reinforcing fiber member 30/30a/30b and its two bonded sections 33/33a/33b and the ribs 31/31a/31b are substantially along the first metal member 10 and the second metal member 20. The straight line connection (for example, the straight composite crank 1 in the aforementioned figure) or the curved line connection direction (for example, the compound crank 1 with curvature) extends, and the two fitting sections 33/33a/33b extend by the rib wall 31/31a/31b After being bent, it is attached to the two opposite inner surfaces of the outer fiber member 40 along the thickness direction of the composite crank 1.

Preferably, the rib walls 31/31a/31b of the reinforcing fiber member 30/30a/30b are along the long axis X (or the connection direction of the first metal member 10 and the second metal member 20) and the reference axis Z (or The thickness direction of the composite crank 1) extends, and the two bonding sections 33/33a/33b extend along the long axis X; in this embodiment, the longitudinal ends of the reinforcing fiber member 30/30a/30b are respectively connected to the first metal member 10 Adjacent to the second metal piece 20.

In this embodiment, the two bonding sections 33/33a/33b of the reinforcing fiber member 30/30a/30b respectively extend from the ribs 31/31a/31b to the opposite direction along the minor axis Y (the width direction of the composite crank 1) , And form a zigzag (FIG. 4A/4B), the first width D1 of the first connecting section 13 of the first metal piece 10 is greater than the second width D2 of the second connecting section 23 of the second metal piece 20 (FIG. 3A/ 3B), and the width of each bonding section 33/33a/33b of the reinforcing fiber member 30/30a/30b adjacent to the first metal member 10 along the minor axis Y (the width direction of the composite crank 1) is larger than that of the adjacent second metal member The width dimension of one end of 20 along the minor axis Y (the width direction of the composite crank 1) can increase the strength of the part of the composite crank 1 adjacent to the first metal piece 10. In other embodiments, the bonding section 33/33a/33b can also be set to a fixed width.

In FIG. 2, the longitudinal ends of the reinforcing fiber member 30 have gaps G1/G2 between the first connecting section 13 of the first metal member 10 and the second connecting section 23 of the second metal member 20, and the outer fiber member 40 is formed The two inner ring ribs 41a/41b are located at the gap G1/G2, that is, the inner ring rib 41a is located between a longitudinal end of the reinforcing fiber member 30 and the first connecting section 13 of the first metal member 10, and the inner ring rib 41b is located on the reinforcing fiber member 30 Between the other longitudinal end and the second connecting section 23 of the second metal member 20.

The outer fiber part 40 is used to cover the first metal part 10/the second metal part 20 with the hollow first connecting section 13/second connecting section 23, and the socket space S between the two, which can reduce the composite crank The weight of the composite crank 1 and the use of the reinforcing fiber 30/30a/30b provided in the socket space S to enhance the structural strength of the composite crank 1 in the thickness direction, so that the composite crank 1 of the present invention has a light weight and can enhance the composite The advantage of the rigidity of the crank 1 in the thickness direction.

Please refer to FIG. 5, FIG. 6 and FIG. 12, the above-mentioned manufacturing method of the composite crank 1 includes the following steps. The following description is mainly based on the manufacturing method. Please refer to the drawings of other embodiments and the corresponding text descriptions for the structural or component features. The component features or structures of other embodiments that are not directly mentioned in the following process are common knowledge in the field. It can also be achieved by applying the following process steps in conjunction with the description of component features or structure.

Step S1: Provide a first metal piece 10, a second metal piece 20, and a longitudinally extending core material 50. For the convenience of description, the following takes the flat composite crank 1 as an example, so the long axis X, the short axis Y, and the reference axis Z that are perpendicular to each other are taken as direction references. However, as mentioned above, in different embodiments, the composite crank 1 can have curvature, torsion or deflection, and variable thickness/width, so the long axis X should be replaced by the first metal piece 10 and the second metal piece 20. The direction of the straight line connection or the curve connection line, the minor axis Y should be replaced by the width direction of the composite crank 1, and the reference axis Z should be replaced by the thickness direction of the composite crank 1, and the aforementioned connection direction, width direction and thickness direction , There is no absolute necessity to be perpendicular to each other in order to conform to the composite crank 1 with curvature, twist or deflection, and thickness/width.

The first metal part 10 may be an aluminum part used to connect the five-way mandrel of the bicycle, and it includes a first connecting hole portion 11 and a first connecting section 13. The first connecting hole portion 11 defines a direction along a reference axis Z A first contact hole 110 is extended, and the first connecting section 13 extends from the first contact hole portion 11 along a long axis X direction, and forms a first opening 132 at an end away from the first contact hole portion 11, the long axis X It is perpendicular to the reference axis Z, and a first chamber 131 communicating with the first opening 132 is formed in the first connecting section 13.

The second attachment member 10 may be an aluminum member for connecting bicycle pedals, and includes a second connecting hole 21 and a second connecting section 23. The second connecting hole 21 defines a direction extending along the reference axis Z A second connecting hole 210. The second connecting section 23 extends from the second connecting hole portion 21 along the long axis X direction, and forms a second opening 232 at an end away from the second connecting hole portion 21. A second chamber 231 communicating with the second opening 232 is formed.

The core material 50 can be waxy material or foamed resin. The core material 50 made of waxy material is a wax core that can be taken out. The core material 50 extends along the long axis X direction, and the core material 50 is opposite to each other along the long axis X direction. The ends are respectively protruding with an insertion portion 53; the core material 50 is provided with a through groove 51 and two embedding grooves 52, the through groove 51 is a long and narrow through hole, along the long axis X direction and the reference axis Z direction or composite crank 1/core The thickness direction of the material 50 extends, and two embedding grooves 52 are respectively recessed on the surface of the core material 50 along the reference axis Z direction or the surface of the opposite side of the composite crank 1/the thickness direction of the core material 50, and communicate with the through groove 51. 52 respectively extend from the through slot 51 in the direction along the minor axis Y.

Step S2: forming a reinforcing fiber piece 30 on the core material 50. The reinforcing fiber piece 30 may use the resin prepreg of the aforementioned fiber sheet, and after passing through the slot 51 of the core material 50, the reinforcing fiber piece 30 protrudes from the core material The sections on opposite sides of the reference axis Z direction are respectively bent and attached to the opposite side surfaces of the core material 50 along the reference axis Z direction, and are respectively accommodated in the two embedding grooves 52 of the core material 50, so as to be reinforced The section of the fiber member 30 passing through the core material 50 forms a rib wall 31, and the section that is attached to the core material 50 on opposite sides along the reference axis Z direction forms two attaching sections 33.

Step S3: Insert opposite ends of the core material 50 with the reinforcing fiber member 30 into the first opening 132 of the first metal member 10 and the second opening 232 of the second metal member 20, respectively. Insert the insertion portions 53 at opposite ends of the core material 50 along the long axis X direction into the first opening 132 of the first metal piece 10 and the second opening 232 of the second metal piece 20, respectively, so that the insertion portion 53 is inserted in the first Inside the first chamber 131 of the metal member 10 and the second chamber 231 of the second metal member 20, the outer surface of the core material 50 is flush with the outer surfaces of the first metal member 10 and the second metal member 20, and The bonding section 33 of the reinforcing fiber member 30 is flush with the outer surfaces of the first metal member 10 and the second metal member 20 on the opposite sides along the reference axis Z direction.

Step S4: Wrap the outer fiber member 40 on the surface of the first metal member 10, the second metal member 20 and the core material 50, and heat and press them into a mold. The outer fiber member 40 can use one or more pieces of the aforementioned fiber sheet resin prepreg to wrap the outer fiber member 40 on the first metal member 10, the second metal member 20, the core material 50 and the reinforcing fiber member 30. After the outer surface of the semi-finished product is completed, the outer fiber part 40 will cover the outer sides of the two bonding sections 33 of the reinforcing fiber part 30, and then the semi-finished product covered with the outer fiber part 40 is placed in a mold for hot pressing. During the compression molding process, the high temperature of the mold can be transmitted from the outer fiber part 40 to the reinforcing fiber part 30, so that the fiber prepreg of the outer fiber part 40 and the fiber prepreg of the reinforcing fiber part 30 are solidified and formed, and the outer fiber The member 40, the first metal member 10, the second metal member 20, and the core material 50 are combined with the reinforcing fiber member 30 into one body.

Step S5: Take out the core material 50 from the outer fiber member 40 if necessary. When the core material 50 is a wax core, the new manufacturing method further includes providing a wax hole to heat the core material 50 out of the outer fiber member 40. The way to take it out can be to drill holes at the position of the outer fiber piece 40 corresponding to the core material 50, and put the drilled crank into the oven to heat the wax, and let the melted core material 50 flow out of the hole and let The original space of the core material 50 forms a hollow socket space S, and a hollow composite crank 1 with reinforcing ribs can be obtained. Since the molten wax can flow out with only a small hole diameter, relatively high structural strength can be maintained after the drilling is filled, and there will be no residual core material 50 or more in the composite crank 1, which will increase the weight or knock sound. The drilling location is not limited to the area where the core material 50 is not inserted into the first metal piece 10 and the second metal piece 20, and wax outlet holes can also be reserved on the first metal piece 10 and/or the second metal piece 20 as needed. When the core material 50 is a foam material, since the core material 50 binds the shrink sleeve to the reinforcing fiber member 30 during the hot pressing process, although it does not need to be taken out, it will not cause unnecessary noise.

Please refer to FIG. 7, in the second preferred embodiment of the present invention, the second hole portion 21 of the second metal member 20 includes a ring groove 24 that surrounds the outer periphery of the second hole 210 and is connected to the second hole The holes 210 are separated by a hole wall 211, and the ring groove 24 is in communication with the second chamber 231, which can further reduce the weight of the composite crank 1; specifically, the second metal piece 20 includes a composite crank along the Z direction of the reference axis 1. Two sub-metal parts 201, 202 that are aligned with each other in the thickness direction of 1, the two sub-metal parts 201, 202 respectively include a sub-outer ring wall 221, 222 and a convex part, and the sub-outer ring walls 221, 222 are formed on the sub-metal part On the outer periphery of 201, 202, the convex part protrudes in the direction of the other sub-metal part 201, 202 along the reference axis Z or the thickness direction of the composite crank 1, and is connected to the other sub-metal part 201, 202. The convex part of 202 abuts, a sub-ring groove 241, 242 is formed between the convex part and the sub-outer ring walls 221, 222, and a sub-joint extending along the reference axis Z or the thickness direction of the compound crank 1 is formed in each convex part. Holes 2101, 2102, and a sub-hole wall 2111, 2112 is formed on the outer periphery of the sub-holes 2101, 2102, and the sub-hole walls 2111, 2112 of the two sub-metal parts 201, 202 abut to form the hole wall of the second metal part 20 211, the sub-contact holes 2101, 2102 of the two sub-metal parts 201, 202 are aligned with each other to form the second contact hole 210 of the second metal part 20, and the sub-ring grooves 241, 242 of the two sub-metal parts 201, 202 are connected to each other. A ring groove 24 surrounding the outer circumference of the hole wall 211 is formed.

Please refer to FIGS. 8-10. In the third preferred embodiment of the present invention, the final product of the composite crank 1 may further include a core material 50. The core material 50 may use foamed resin, and the core material 50 is arranged in the socket space S , The opposite ends of the core material 50 are respectively inserted into the first opening 132 of the first metal piece 10 and the second opening 232 of the second metal piece 20, and the rib wall 31 of the reinforcing fiber piece 30 penetrates the core material 50, so that The core material 50 is used to be supported in the sleeve space S to improve the structural strength of the composite crank 1 during the hot press forming process of the model.

The method for manufacturing the composite crank 1 with the core material 50 is to assemble the first metal part 10, the second metal part 20, and the core material 50 with the reinforcing fiber part 30, and then overmold the outer fiber part 40 in After the first metal member 10 and the second metal member 20 are combined with the surface of the core material 50 and the two bonding sections 33 of the reinforcing fiber member 30, the composite crank 1 with the core material 50 can be obtained without the need to The core material 50 is taken out from the outer fiber member 40. When the core material 50 is a foamed material, since the core material 50 fixes the shrinkage hoops on the reinforcing fiber member 30 after the hot pressing process of the model, although it does not need to be taken out, it will not cause unnecessary noise.

Preferably, the rib wall 31 of the reinforcing fiber member 30 extends into the first chamber 131 of the first metal member 10 and the second chamber 231 of the second metal member 20, and the rib wall 31 of the reinforcing fiber member 30 and The first metal member 10 and the second metal member 20 are combined to increase the structure; the two bonding sections 33 of the reinforcing fiber member 30 can be further attached to the first chamber 131 of the first metal member 10 along the reference axis Z The opposite side of the direction, and the opposite side of the second chamber 231 of the second metal member 20 along the reference axis Z direction, the through slot 51 of the core material 50 extends to the insertion portion 53 of the core material 50, and the insertion portion 53 is located along the reference axis The surfaces on opposite sides of Z are respectively recessed with insertion grooves 525, which are connected to the insertion groove 52 and form a gap. The bonding section 33 of the reinforcing fiber member 30 can be placed in the insertion groove 52 and inserted along the gap. In the embedding groove 525, and selectively attached to the surfaces of the first chamber 131 of the first metal member 10 and the second chamber 231 of the second metal member 20, the bonding section 33 of the reinforcing fiber member 30 extends into the The two end parts of the first chamber 131 and the second chamber 231 may therefore have a step difference with the body section that does not extend into the first chamber 131 and the second chamber 231. Wherein, the bonding section 33 of the reinforcing fiber part 30 and the surfaces of the first chamber 131 and the second chamber 231 can be pasted with a glue material, so that the bonding section 33 of the reinforcing fiber part 30 can be more firmly combined On the inner surfaces of the first chamber 131 and the second chamber 231. In different embodiments, the ribs 31 and/or the two bonding sections 33 of the reinforcing fiber member 30 can extend into the first chamber 131 of the first metal member 10 and the second chamber of the second metal member 20 individually or simultaneously 231.

In different embodiments, the method for manufacturing the composite crank 1 of the present invention may include the step of bending the two bonded sections 33 of the reinforcing fiber member 30 from the long sides of the rib wall 31 and extending them in the width direction of the composite crank 1. Extending in the width direction can mean that the two bonding sections 33a of the single reinforcing fiber member 30a are facing the same direction at the same time (Figure 11), or the two bonding sections 33 of the single reinforcing fiber member 30 are facing opposite directions (FIG. 4A/4B), or as shown in the figure. 11. Each bonding section 33a/33b of the double-reinforcing fiber member 30a/30b extends on opposite sides of the short axis Y direction (width direction) at both ends of the rib wall 31. In other embodiments, the method for manufacturing the composite crank 1 of the present invention may include extending the rib 31 and/or the two bonding sections 33 of the reinforcing fiber part 30 into the first opening 132 and the second metal part of the first metal part 10. Step of the second opening 232 of the piece 20. In another embodiment, the first connecting section 13 of the first metal member 10 is provided with a first chamber 131, and the second connecting section 23 of the second metal member 20 is provided with a second chamber 231. The composite crank of the present invention The manufacturing method may include: extending the two bonding sections 33 of the reinforcing fiber member 30 through the first opening 132 and the second opening 232 respectively into the inner surface of the first chamber 131 attached to the first metal member 10, and The inner surface of the second chamber 231 of the two metal parts 20.

Preferably, the two sub-metal parts 201 and 202 of the second metal part 20 are respectively provided with at least one concave portion 252 and at least one convex portion 251 that are opposed to each other, which improves the convenience and stability of assembly.

Please refer to FIG. 11, in the fourth preferred embodiment of the present invention, the bonding sections 33a/33b of the two reinforcing fiber parts 30a/30b are opposite to each other along the short axis Y direction (width direction) at the ends of the rib wall 31 Side extension, so that the overall cross-section of the reinforcing fiber part 30a/30b is H-shaped. For example, the reinforcing fiber part 30a/30b can be folded into a U-shape and an inverted U-shape by using two carbon fiber prepregs, and then formed by thermocompression and solidification by a mold. The H-shaped reinforcing fiber parts 30a/30b are combined, and the H-shaped reinforcing fiber parts 30a/30b are used to improve the structural strength of the composite crank 1. Figure 11 is compared with Figure 4A/4B, Figure 4A/4B single reinforcing fiber member 30/30a/30b itself has two bonding sections 33/33a/33b bent by the long side of the rib wall 31/31a/31b, two The fitting section 33/33a/33b may extend in the same direction or in the reverse direction (in the short axis Y or the width direction of the composite crank 1) as needed; in addition, the reinforcing fiber member 30a/30b of the Z-frame in Figure 4A/4B, It can assist the composite crank 1 with curvature or deflection structure to be used for shear stress in a specific direction of load.

In other embodiments, with appropriate manufacturing processes, the two opposing inner surfaces of the aforementioned bonding section 33/33a/33b and the outer fiber member 40 may also not require large-area bending and surface attachment. The bonding section 33 /33a/33b can only be used as the attachment end surfaces of the two sides of the rib wall 31/31a/31b and the two opposite inner surfaces of the outer fiber member 40. In other words, the reinforcing fiber member 30/30a/30b may only have a 1-shape, and the bonding section 33/33a/33b is not bent.

The above are only the preferred embodiments of the present invention, and do not impose any formal restrictions on the present invention. Anyone with ordinary knowledge in the relevant technical field can use the present invention without departing from the scope of the technical features of the present invention. The equivalent embodiments with partial changes or modifications made to the technical content disclosed in the new model without departing from the content of the technical solution of the present invention still fall within the scope of the technical features of the present invention.

1: Compound crank 10: The first metal piece 11: The first hole 110: first jack 13: The first connection segment 131: The First Chamber 132: The first opening 133: The first connecting wall 20: The second metal piece 201,202: Sub-metal parts 21: The second hole 210: second jack 2101,2102: sub-hole 211: Hole Wall 2111,2112: sub-hole wall 221,222: Sub-outer ring wall 23: second connection segment 231: The Second Room 232: second opening 233: Second connecting peripheral wall 24: ring groove 241,242: Sub-ring groove 251: Convex 252: Concave 30: Reinforcing fiber parts 31: ribs 33: Fitting section 40: Outer fiber parts 41a, 41b: inner ring rib 50: core material 51: piercing 52: Insert slot 525: Insert slot 53: Insertion part X: long axis Y: short axis Z: reference axis D1: first width D2: second width G1, G2: gap S: socket space

Figure 1 is a perspective view of the first preferred embodiment of the new model. Fig. 2 is a top sectional view of the first preferred embodiment of the new type, showing that it has a reinforcing fiber member. Figure 3A is a side cross-sectional view of another preferred embodiment of the new invention, showing that it has a plurality of reinforcing fiber members. Figure 3B is a side cross-sectional view of the first preferred embodiment of the new type, showing that it has a reinforcing fiber member. Fig. 4A is a side sectional view of another preferred embodiment of the new type, showing that it has a plurality of reinforcing fiber members. Figure 4B is an end sectional view of the first preferred embodiment of the new type. Figure 5 is a three-dimensional exploded view of the first preferred embodiment of the new type (outer fiber parts omitted). Fig. 6 is a schematic diagram of the action of covering the outer fiber part of the first preferred embodiment of the new type. Fig. 7 is a perspective exploded view of the second preferred embodiment of the new type (outer fiber parts omitted). Figure 8 is a three-dimensional exploded view of the third preferred embodiment of the new type (outer fiber parts omitted). Fig. 9 is a top sectional view of the third preferred embodiment of the new type. Fig. 10 is a side sectional view of the third preferred embodiment of the new type. Fig. 11 is an end sectional view of the fourth preferred embodiment of the new type. Figure 12 is a block diagram of the new manufacturing method.

1: Compound crank

10: The first metal piece

11: The first hole

110: first jack

13: The first connection segment

131: The First Chamber

132: The first opening

133: The first connecting wall

20: The second metal piece

21: The second hole

210: second jack

23: second connection segment

231: The Second Room

232: second opening

233: Second connecting peripheral wall

30a, 30b: Reinforcing fiber parts

31a, 31b: rib wall

33a, 33b: Fitting section

40: Outer fiber parts

41a, 41b: inner ring rib

X: long axis

Y: short axis

D1: first width

D2: second width

G1, G2: gap

S: socket space

Claims (18)

A composite crank, including: A first metal piece, including A first contact hole portion having a first contact hole; and A first connecting section extending from the first hole portion and forming a first opening at an end away from the first hole portion; A second metal piece is arranged at intervals from the first metal piece to define a socket space formed in the composite crank and located between the first metal piece and the second metal piece, the second metal piece including A second contact hole portion having a second contact hole; and A second connecting section extending from the second connecting hole portion and forming a second opening at an end away from the second connecting hole portion, and the socket space communicates with the first opening and the second opening; An outer fiber piece covering the first metal piece, the second metal piece, and the socket space; and A reinforcing fiber piece, extending along a connecting direction of the first metal piece and the second metal piece, is disposed between the first metal piece and the second metal piece, and includes Two bonding sections are respectively bonded to two opposite inner surfaces of the outer fiber member along the thickness direction of the composite crank; and A rib wall is arranged in the socket space and connects the two bonding sections. The composite crank according to claim 1, wherein the ribs of the reinforcing fiber member extend along the thickness direction and the connecting direction, and the two bonding sections extend along the connecting direction and the width direction of the composite crank. The composite crank according to claim 1, wherein the first connecting section of the first metal piece is provided with a first chamber communicating with the socket space through the first opening, and the second connection of the second metal piece The section is provided with a second chamber communicating with the socket space through the second opening. The composite crank according to claim 3, which comprises a core material disposed in the socket space, and opposite ends of the core material are respectively inserted into the first chamber and the second metal of the first metal part The second chamber of the fiber part, and the rib wall of the reinforcing fiber part penetrates the core material. The composite crank of claim 4, wherein the core material is provided with a through groove and two embedding grooves, the through groove extending along the connecting direction and the thickness direction, and the two embedding grooves are respectively recessed in the core material along the The surface on the opposite side of the thickness direction is connected with the through groove, the rib wall of the reinforcing fiber piece is penetrated through the through groove of the core material, and the two bonding sections of the reinforcing fiber piece are respectively accommodated in the two inserts of the core material groove. The compound crank according to claim 3, wherein the second receiving hole portion of the second metal member includes a ring groove surrounding the outer circumference of the second receiving hole, and a gap between the ring groove and the second receiving hole The hole wall is separated, and the ring groove communicates with the second chamber. The composite crank according to claim 6, wherein the second metal piece includes two sub-metal pieces that are aligned with each other along the thickness direction. The compound crank according to claim 7, wherein the two sub-metal parts are respectively provided with at least one concave portion and at least one convex portion that are opposed to each other. The composite crank according to any one of claims 1 to 8, wherein the two bonding sections of the reinforcing fiber member are respectively bent from the long side of the rib wall and extend in opposite directions. The composite crank according to any one of claims 1 to 8, wherein the two bonding sections of the reinforcing fiber member are respectively bent from the long side of the rib wall and extend in the same direction. The composite crank according to any one of claims 3 to 8, wherein the rib wall of the reinforcing fiber member extends into the first chamber of the first metal member and the second chamber of the second metal member. The composite crank according to any one of claims 3 to 8, wherein the two bonding sections of the reinforcing fiber member extend into the first chamber of the first metal member and the second chamber of the second metal member . The composite crank according to any one of claims 3 to 8, wherein the rib wall extension and the two bonding sections of the reinforcing fiber part extend into the first chamber of the first metal part and the second metal part The second room. The composite crank according to claim 12, wherein the two bonding sections of the reinforcing fiber member extend into the two end portions of the first chamber and the second chamber, and the two bonding sections do not extend into the The body section of the first chamber and the second chamber has a step difference. The composite crank according to claim 13, wherein the two bonding sections of the reinforcing fiber member extend into the two end portions of the first chamber and the second chamber, and the two bonding sections do not extend into the The body section of the first chamber and the second chamber has a step difference. The composite crank according to claim 12, wherein the two bonding sections of the reinforcing fiber member respectively extend into the surface of the first chamber attached to the first metal member and the surface of the second chamber of the second metal member . The composite crank according to claim 13, wherein the two bonding sections of the reinforcing fiber member respectively extend into the surface of the first chamber attached to the first metal member and the surface of the second chamber of the second metal member . The compound crank according to any one of claims 1 to 8, wherein the first connecting section has a first width extending in the width direction of the compound crank, and the second connecting section has a first width extending in the width direction A second width, the first width of the first connecting section of the first metal piece is greater than the second width of the second connecting section of the second metal piece, and each bonding section of the reinforcing fiber piece is adjacent to one end of the first metal piece The width dimension along the width direction is greater than the width dimension along the width direction adjacent to one end of the second metal piece.

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