A bicycle five-way structure and its production process

Abstract

The present invention discloses a bicycle five-way structure and its production process. A bicycle five-way structure includes a five-way body, the five-way body is formed with an installation cavity for installing a motor, the side wall of the installation cavity is formed with at least one motor base for fixing the motor, and the motor base and the five-way body are integrally formed. The production process is to first separately form a latex mandrel and a silicone mandrel with a motor base shaping groove, and then combine the two, adhere a composite material on their surfaces, and put them into a mold for pressurized heating and molding. The present invention uses a latex mandrel and a silicone mandrel combination as the inner core of the product without changing the shape of the existing five-way motor, and forms a motor base shaping groove on the silicone mandrel, so that the motor base is integrally formed with the product to ensure that the motor base is accurately positioned on the product, which can not only simplify the mold design of the five-way area of ​​the product, but also prevent the problem of position displacement and size enlargement of the motor base during the product molding process, reduce yarn clamping, and improve product quality.

Description

Technical Field

[0001] The invention relates to the field of bicycles, in particular to a bicycle five-way structure and a production process thereof. Background Art

[0002] The public's awareness of environmental protection is increasing. At the same time, the market demand for electric bicycles that meet daily commuting and fitness needs is increasing. More and more traditional bicycle brands are launching electric bicycle models. High-end series of composite bicycles (generally carbon fiber bicycles) are also beginning to launch electric bicycle series in large quantities. The development trend of composite electric bicycles is obvious.

[0003] The five-way area of ​​composite electric bicycles needs to assemble the motor, so its shape is much more complicated than that of traditional bicycles. The base for installing the motor needs to be formed in the five-way area. If it is formed by traditional compression molding, not only is the mold design complicated and difficult to operate, but also the material overflow and extrusion of yarn are prone to problems during the compression molding process, which will cause the base position to shift or the size to become larger, and the product quality rate is low. Therefore, it is necessary to grind the part that exceeds the size, which not only increases the subsequent processing steps, but also reduces the fiber straightness due to grinding, affecting the strength quality of the product. Summary of the invention

[0004] The invention aims to provide a bicycle five-way structure and a production process thereof, which can simplify mold design, reduce yarn clamping and improve product quality.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A bicycle five-way structure comprises a five-way body, wherein the five-way body is formed with an installation cavity for installing a motor, and the side wall of the installation cavity is formed with at least one motor base for fixing the motor, and the motor base is integrally formed with the five-way body.

[0007] The five-way body and the motor base are both made of composite materials.

[0008] The number of the motor bases is six, which are divided into two groups and symmetrically arranged on both sides of the installation cavity.

[0009] A production process for a bicycle five-way structure comprises the following steps:

[0010] Step 1, forming a latex mandrel and a silicone mandrel respectively;

[0011] When forming the latex core shaft, first use EPS foam material to form an EPS core shaft with the same appearance as the product, and the surface of the EPS core shaft is concave to form a clearance space corresponding to the silicone core shaft; then the surface of the EPS core shaft is roughened and covered with latex liquid, and the latex liquid is solidified to obtain the latex core shaft;

[0012] When forming the silicone mandrel, a silicone mandrel corresponding to the silicone forming and the clearance space is used, and a motor base shaping groove is formed on the surface of the silicone mandrel;

[0013] Step 2, assemble the silicone mandrel in the clearance space of the latex mandrel to obtain a combined mandrel;

[0014] Step 3: Paste the composite material on the surface of the combined mandrel according to the physical properties and modeling requirements of the product, and make a pre-stacked product with the assistance of a pre-stacked fixture;

[0015] Step 4: Place the pre-stacked product into the product mold, close the mold, pressurize, heat and solidify it.

[0016] In the step 1, the thickness of the latex liquid after solidification is 0.4-1.5 mm.

[0017] In step 3, the composite material includes one or at least two of carbon fiber, carbon fiber cloth, glass fiber, glass fiber cloth, aromatic fiber, aromatic fiber cloth, basalt fiber, etc.

[0018] In step 4, the pressurizing pressure is 1-15 kgf / cm2.

[0019] In step 4, the heating temperature is 100-160°C.

[0020] After adopting the above structure, the present invention uses a combination of a latex core shaft and a silicone core shaft as the inner core of the product without changing the shape of the existing five-way motor, and forms a motor base molding groove on the silicone core shaft, so that the motor base and the product are integrally molded to ensure that the motor base is accurately positioned on the product, which can not only simplify the mold design of the five-way area of ​​the product, but also prevent the motor base from being displaced and enlarged in size during the product molding process, thereby reducing yarn clamping and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of a bicycle five-way structure according to a specific embodiment of the present invention;

[0022] Figure 2 It is a stereoscopic diagram of a latex mandrel according to a specific embodiment of the present invention;

[0023] Figure 3 It is a three-dimensional diagram of a silicone mandrel according to a specific embodiment of the present invention;

[0024] Figure 4 A three-dimensional diagram of a combined mandrel according to a specific embodiment of the present invention;

[0025] Description of the accompanying drawings: five-way body 1; mounting cavity 11; motor base 12; latex core shaft 2; clearance space 20; silicone core shaft 3; motor base molding groove 31. DETAILED DESCRIPTION

[0026] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0027] refer to Figure 1 As shown, a bicycle five-way structure is mainly used in electric bicycles, including a five-way body 1, the five-way body 1 is formed with a mounting cavity 11 for mounting a motor, the side wall of the mounting cavity 11 is formed with at least one motor base 12 for fixing the motor, and the motor base 12 and the five-way body 1 are integrally formed.

[0028] The five-way body 1 and the motor base 12 are both made of composite materials.

[0029] In this embodiment, the number of the motor bases 12 is six, which are divided into two groups and symmetrically arranged on both sides of the mounting cavity 11 to ensure the stable installation of the electric bicycle motor. In this embodiment, four of the motor bases 12 are formed using the following method, and the other two are directly molded.

[0030] In the above-mentioned bicycle five-way structure, the motor base 12 and the five-way body 1 are designed to be integrally formed, which can avoid the strength reduction problem caused by drilling holes in the five-way body 1 to install the motor base 12, so that the strength of the product is guaranteed.

[0031] The above-mentioned bicycle five-way bracket structure can be produced by the following production process of a bicycle five-way bracket structure, which specifically includes the following steps:

[0032] Step 1: Form a latex core shaft 2 and a silicone core shaft 3 respectively.

[0033] The molding Figure 2 When the latex core shaft 2 is shown, an EPS core shaft with the same appearance as the product is first formed using EPS foam material, and the surface of the EPS core shaft is concave to form a clearance space 20 corresponding to the silicone core shaft 3, and then the surface of the EPS core shaft is roughened and impregnated in a container filled with latex liquid, and a 0.4-1.5 mm latex layer is attached to the surface of the EPS core shaft by baking, thereby obtaining the latex core shaft 2. The above-mentioned latex layer acts as a wind pressure air bag in the subsequent production process.

[0034] Forming Figure 3When the silicone core shaft 3 is shown, the silicone core shaft 3 corresponding to the clearance space 20 is used for silicone molding, and the surface of the silicone core shaft 3 is formed with a motor base molding groove 31. Of course, before molding the latex core shaft 2 and the silicone core shaft 3, it is necessary to design drawings to determine the shape and size of the latex core shaft 2 and the silicone core shaft 3 according to the product thickness, the shape of the five-way area of ​​the product, the assembly method of the latex core shaft 2 and the silicone core shaft 3, etc. The silicone material can be replaced by other pre-molded rubber materials with good release effect.

[0035] Step 2: Assemble the silicone core shaft 3 in the clearance space 20 of the latex core shaft 2 to obtain Figure 4 Combined mandrel shown.

[0036] Step 3. Different fiber materials (such as carbon fiber, carbon fiber cloth, glass fiber, glass fiber cloth, aromatic fiber, aromatic fiber cloth, basalt fiber, etc.) and different layers of pre-impregnated resin fiber yarns are affixed to the surfaces of different areas of the combined mandrel according to the physical properties and modeling requirements of the electric bicycle product, and a pre-stacked product close to the product appearance is made with the assistance of a pre-stacking fixture.

[0037] Step 4: Place the pre-stacked product with laminated fibers into the product mold, close the mold, and apply pressure (1~15kgf / cm 2 ), heating (100-160°C) and curing. In this step, the silicone core shaft 3 is used as a shaping piece between the latex core shaft 2 and the fiber, which can prevent the fiber in the motor base shaping groove 31 from displacement and overflow due to extrusion when the fiber is cured.

[0038] Through the above method, the present invention uses a combination of a latex core shaft 2 and a silicone core shaft 3 as the inner core of the product without changing the shape of the existing five-way motor, and forms a motor base molding groove 31 on the silicone core shaft 3, so that the motor base 12 is integrally formed with the product to ensure that the motor base 12 is accurately positioned on the product, which can not only simplify the mold design of the five-way area of ​​the product, but also prevent the motor base 12 from being offset and enlarged in size during the product molding process, thereby reducing yarn clamping and improving product quality.

[0039] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A production process for a bicycle five-way structure, characterized in that The following steps are involved: Step 1, forming a latex mandrel and a silicone mandrel respectively; When forming the latex core shaft, first use EPS foam material to form an EPS core shaft with the same appearance as the product, and the surface of the EPS core shaft is concave to form a clearance space corresponding to the silicone core shaft; then the surface of the EPS core shaft is roughened and covered with latex liquid, and the latex liquid is cured into a latex layer by baking to obtain the latex core shaft; When forming the silicone mandrel, a silicone mandrel corresponding to the silicone forming and the clearance space is used, and a motor base shaping groove is formed on the surface of the silicone mandrel; Step 2, assemble the silicone mandrel in the clearance space of the latex mandrel to obtain a combined mandrel; Step 3: Paste the composite material on the surface of the combined mandrel according to the physical properties and modeling requirements of the product, and make a pre-stacked product with the assistance of a pre-stacked fixture; Step 4: placing the pre-stacked product into a product mold, closing the mold, pressurizing, heating and curing the mold; wherein the latex layer of the latex core shaft acts as a wind pressure air bag.

2. The production process of a bicycle bottom bracket structure according to claim 1, characterized in that: In the step 1, the thickness of the latex liquid after solidification is 0.4-1.5 mm.

3. The production process of a bicycle bottom bracket structure according to claim 1, characterized in that: In step 3, the composite material includes one or at least two of carbon fiber, carbon fiber cloth, glass fiber, glass fiber cloth, aromatic fiber, aromatic fiber cloth, and basalt fiber.

4. The production process of a bicycle bottom bracket structure according to claim 1, characterized in that: In step 4, the pressure is 1-15 kgf / cm 2 .

5. The production process of a bicycle bottom bracket structure according to claim 1, characterized in that: In step 4, the heating temperature is 100-160°C.

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