TWI274008B - Manufacturing method of crank - Google Patents

Abstract

The invention relates to providing a manufacturing method of crank. It is manufactured by fiber yarn entwining, heat press molding, surface treatment, and product finishing. The crack doesn't need to strengthen by metal parts to be less weight. The pretension from the compounded fiber yarn brings the maximum strength, and its path almost parallels the axis of the crack to increase the bearing from stamping force of a rider, and it is enhanced the structure strength. It is applied the structural foam or honeycomb structure and entwining equipment to replace the stacking by hand, to solve the problem of traditional manufacture of the crack to be less cost, less weight, high strength, and mass production.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a bicycle crank, and more particularly to a crank which is formed by winding a fiber bundle, which can greatly reduce the weight of the crank and increase the strength of the crank structure. [Prior Art]

With the development and advancement of science and technology, people's demands for things have become quite delicate and demanding from the old thinking of "can be used". Only the concept of continuous improvement or innovation has produced new forms to improve products. The added value and effective cost reduction can survive the fierce competition in the market. Referring to the first figure, the conventional bicycle crank is made of iron, aluminum, etc., in order to reduce the weight and increase the strength, the current crankshaft is mostly made of composite material 2 to manufacture the metal component 3 Basically, the composite material 2 is stacked on the outer edge of the metal member 3 and then hot pressed. The crank 1 replaces some of the impurities with a composite material, so that the crank is lightened and the knot is improved. The base of the crank handle makes the weight of the crank 1 limited. And the song ^ = : (four), need to bear the rider's axial pedaling force, but the cover is all: the part of the axis _ composite cross pattern ': the stacked composite material is perpendicular to the force method . In addition, Qian Ke layer = construction, not easy to use, too private, 'completely need to manually carbon fiber pre-

This time, the crank 1274008 is immersed in a stack of sheets, which is time consuming and labor intensive. The above-mentioned conventional methods of making f"Shifa _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Therefore, the present invention intends to eliminate the redness and reduce the problems encountered in the prior art. [Technical content] The technical problem to be solved by the manufacturing method of Yu Yu inf crank is that the handle is replaced by a composite material, so that the weight of the crank is made. Γ The knot is increased, and the basic principle of the lyric handle is - the metal structure makes the weight of the crank can be reduced. When the crank is in use, the treading force 'the second and the -1 series which are covered on the outside of the metal member are stacked in a parental manner to form a cross-shaped road, and some of the axially stacked materials can bear the pedaling. Strength, however, the laterally stacked composites are perpendicular to the direction of the force and cannot withstand the pedaling force. The increased structural strength is limited and not easy to use. The present invention provides a method for producing a crank which is produced by a fiber yarn winding, a hot press forming, a surface treatment, and a finished product (4). The use of a metal member is based on the use of a metal member to substantially reduce the weight of the crank. And the pre-force winding of the composite fiber yarn bundle exerts the maximum strength of the fiber yarn bundle and the path line is mostly parallel to the axial direction of the crank, and can effectively withstand the riding force I, so that the structural strength of the crank is greatly increased. Improve, real = dog breaks all the bottlenecks of the traditional crank process, and replaces the domestic bicycle industry to bring another peak, in order to achieve low-cost, light weight, high-intensity mass production requirements, it is a very industrial use and Progressive design. 1274008 Therefore, the characteristics of the technology are as follows: 1. Applying the fiber yarn winding technique, the strength and rigidity of the fiber bundle are maximized due to the pre-stress effect of the fiber bundle. 2. Replace the artificial lamination with the lamination device stacking, saving time and maintaining good quality. 3. Special pattern of winding to increase the torsion resistance of the crank. 4. Short fiber bundles strengthen the structural foaming of the foamed material, increase the strength of the foamed material (>5000 psi), and increase the compressive strength of the crank. 5. The fiber yarn weaving and honeycomb structure greatly increases the compressive strength of the crank while reducing the weight. Other objects, advantages and novel features of the invention will be apparent from the description and appended claims. [Embodiment] The technology, the means and the functions thereof used in the present invention are described in detail with reference to the drawings as follows: Please refer to the second figure to the tenth figure, which is shown in the figure. The manufacturing method/structure used in the invention is selected for the purpose of illustration and is not limited by such manufacturing method/structure. The present invention relates to a method for manufacturing a crank and a product thereof. Referring to the second figure, the manufacturing method of the bicycle crank is mainly for winding a composite material between two joint members, so that the crank is reduced in weight A. The next step is "rigid", "dynamic" and "impact resistance", and then the crank is formed by hot press forming, and the semi-finished product is subjected to surface treatment 12740008 (dressing, grinding, soil filling, painting, etc.) ^ Only the finished product can be completed, and the bicycle crank of the present invention can be completed after the above-mentioned process, which is lighter, more diligent and has better weight than a crank made of a composite material. = good, impact resistance, the production process for the present invention will be described in detail by way of example below (this patent is not limited to this example) · · "I" · entanglement:

Referring to the third figure, the joint member 2 having the screw hole 12 is first placed on the mold_positioning rod 21 during production. Referring to the fourth figure, the winding machine 31 is then wound around the two-joint member 丨丨. Referring to the fifth drawing, the pre-formed foamed material 4〇 or honeycomb structure material may be placed between the two δ members 11, and the composite fiber bundle 3 丨 is wound around the two joint members 11 by the winder 30. The winding method may be wet winding, that is, the fiber yarn bundle is entangled on the two joint members after being impregnated with the resin, and may be hardened at normal temperature or high temperature; or may be dry-wound, that is, the fiber yarn bundle is pre-formed into a pre-impregnated yarn bundle and then wound. . In the first embodiment, the winding path of the winding machine 30 is an annular winding. The composite fiber yarn bundle is carbon fiber, aramid fiber, glass fiber, ceramic fiber, and various reinforcing rayon and natural fiber. The impregnated resin is a reactive artificial resin such as an epoxy resin, a vinyl ester, a polyester, a phenol resin, an acrylic resin, a polyurethane, a silicone resin, etc., and can be molded at room temperature or high temperature. Referring to the sixth drawing, a part of the space 13 in the winding 1 is not entangled by the composite fiber bundle to form a cavity. Referring to the seventh drawing, a short fiber (<1/2 inch pair) reinforced structural foaming material 4〇 can be filled into the space 13. The space is filled in the space 13 according to the eighth figure or in a honeycomb structure, and the composite material 1274008 prepreg is coated on the outer edge of the crank 10. The foamed material may be a conventional foaming material such as an epoxy resin, a vinyl ester, a polyester, a phenol resin, an acrylic resin, a polyamine phthalic acid, a polyvinyl chloride resin or the like. The honeycomb structure can be used as a common honeycomb structure material such as Ming, Nomex (Aramid), plastic, etc., and the best use is Nomex material. "Π"·Hot forming:

After the first winding step of the present invention, the mold can be processed according to the processing conditions of the composite prepreg, usually at a temperature of 14 〇, ΐ6 〇π, and the high pressure is heated for about 10 min to 45 min to make the composite fiber yarn. The bundle 31 and the staple fiber reinforced structural foam material 4〇 can be thermally foamed or thermally cured with the honeycomb structure prepreg, and the composite fiber bundle 31 and the composite prepreg are bonded to the two. The piece 11 is combined and molded. "冚" · Surface treatment: Referring to the ninth figure, the formed crank 1〇 can be removed for reaming, rounding, grinding, painting, etc., so that the surface of the crank 1 is trimmed by the rough surface To a smoother surface, and can be painted according to the color or pattern of the bicycle. "IV"·Finished product: Referring to the tenth figure, after all the above-mentioned manufacturing processes, the finished product of the bicycle crank 10 can be produced. It is to be noted that the present invention does not require the use of a metal member, and the entire crank 10 joint member u is made of a metal material, which can greatly reduce the weight of the crank 10. In addition, in order to fix the two-metal joint U, a thin bar can also be used for connection and positioning. Referring to the seventh figure, and the winding of the composite fiber yarn bundle

1274008 The orbital path is mostly parallel to the axial direction of the crank 10, and can effectively withstand the rider's pedaling force, so that the structural strength of the crank 10 is greatly improved, and it is easy to use and practical. The field/the eleventh drawing shows a second embodiment of the present invention, and the second embodiment is the same as the first embodiment, except that the winding path of the winding machine 30 is eight-shaped in the second embodiment. Intertwined with the ring to provide better torsion resistance of the composite crank. As can be seen from the above detailed description, the present invention provides a method for manufacturing a crank, which is a manufacturing bottleneck of the breakthrough and the crank, and is actually an invention with great industrial applicability. The above arguments are discussed: The manufacturing method of the crank is made by a manufacturing process such as fiber yarn winding, hot press forming, surface treatment, and finished product. The crank: The metal member is used as a reinforcement foundation to greatly reduce the weight of the crank. Moreover, the composite fiber bundle _ age (four) is mostly parallel to the axial direction of the crank and can effectively bear the pedaling force of the rider, so that the structural strength of the crank is greatly improved, and the bottleneck of the traditional crank process has been broken. ^ Bring another peak to the domestic bicycle industry, in order to achieve the low-cost, heavy = degree of mass production requirements, it is quite practical and the former is the view, the invention is very industrial use Value, and there is no such thing as 3 or similar inventions appearing in domestic and foreign publications or in public use. It has already been a positive and negative element of the law, and it should be granted invention patents. Only the above description is only a preferred embodiment of the present invention, and when it cannot be implemented by a mosquito, it is a change or an equivalent element.

The replacement of the 1274008 component or the equivalent variations and modifications in accordance with the scope of the present invention should remain within the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a cross-sectional view of a conventional crank. The second figure is a flow chart of the manufacturing method of the present invention. The third figure is a schematic diagram of the date of the hair, and the joint member is placed on the mold. The fourth figure is a third_continuation' table winder that winds the composite fiber bundle around the two joints. The fifth figure is the continuation of the third figure. The foaming material is pre-formed and placed between the two joints. The line reader then wraps the composite fiber yarn around the two joints. In the continuation of the four figures, some of the space in the handle of the watch is not entangled by the bundle of composite fiber yarns to form a void. The seventh figure is a continuation of the sixth figure, which fills the space of the crank with the foam material. The eighth figure is a continuation of the sixth figure, which fills the space of the crank with the honeycomb structure. Figure 9 is a schematic illustration of the surface treatment steps of the present invention. The tenth figure is a perspective view of the finished product of the present invention. Figure 11 is a schematic view of a winding path of a second embodiment of the present invention. [Main component symbol description] (conventional) 1 crank 2 composite material 3 metal member (present invention) 1274008

10 Crank 11 Engagement 12 13 Space 20 Mold 21 30 Winding machine 31 Fiber yarn bundle 40 Screw hole Positioning rod Foaming material 镛

12 (E

Claims (1)

1274008 fT year μ丨丨I曰Supplement 10, the scope of application for patents·· The manufacturing method of L cranks, including the following steps·· The resin parts are placed on the mold: then the yarn bundle of the impregnated suction mouth is wound around the two joint pieces; ; "Π" hot press forming: the winding is completed into the mold, the hot pressing m surface treatment · · the forming of the crank for surface treatment; "finished product: the surface after the completion of the crank is the finished product. The crank hitting joint member as described in claim 1 has a screw hole. The method of manufacturing the crank according to the first aspect of the patent application, wherein (4) y, the fiber yarn bundle is wound by the winding machine or the circular knitting machine in the second joint, and the patent application scope is the first item. In the manufacturing method of the crank, the pot is pre-modified with a bundle of fiber yarns.丌 干 干 咳 t t 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请 申请The winding path of the bundle of material fibers is annularly wound. (4) =! Please refer to the manufacturing method of the crank described in the first paragraph of the patent scope, Lizhong fun coffin fiber turn, silk _ road shot for the time shape and the intertwined entanglement in the middle of the complex ^ such as / material rhyme the first rhyme The manufacturing method of the stalk is the rayon and the natural fiber for the reinforcement of the money, the gram, the recording fiber, the surface fiber, the pottery, the cut, the quasi-and the various reinforcements. Spoon £ δ. The method for manufacturing a crank as described in claim 1, the 13 i 1274008 - 曰 ... 曰 - disc resin, acrylic resin, polyurethane urethane, can be hardened by temperature or high temperature forming. ▲ 9· The manufacturing method of the crank according to claim 1 of the patent scope, wherein / 廛, : 7 〇 之 之 曲 部份 部份 部份 部份 部份 部份 部份 部份 部份 部份 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲 曲The foaming material or the honeycomb structure material is placed in the cavity and then subjected to a hot press forming step. 10. The method for manufacturing a crank according to the application of the patent specification, wherein the foam material or the honeycomb structure material previously prepared as 51 is placed between the two joint members, and the composite fiber bundle of the έ/又树 is wrapped around Two joint pieces. 11. The manufacturing method of the crank described in the ninth or first aspect of the patent application 'is used in the production of epoxy resin, vinyl ester, polyester, secret resin, acryl resin, polyamine Ethyl citrate, polyvinyl chloride resin and other materials. 12. The method for manufacturing a crank as described in claim 9 or 1 (), wherein the honeycomb structure material used therein can be pumped, Nomex, plastic #, etc. 13. If the patent application scope is the first item In the manufacturing method of the crank, the composite material may be coated on the outer edge of the crank, and then hot-twisted. 14. The method of manufacturing a crank according to claim 1, wherein the surface treatment step comprises reaming, rounding, and grinding the backing paint. 15. The crank of claim 1 The manufacturing method ' ^ The mold can be formed at medium temperature or high temperature, and the optimum molding is used after heating at a pressure of about 1 14 1274008 ° C to 160 ° C for about 10 min to 45 min. 15 (s