Lightweight wheel rim for preventing sidewall dishing

Abstract

The utility model discloses a kind of lightweight wheel rim for preventing side wall recess, it relates to wheel rim technical field, this kind of lightweight wheel rim for preventing side wall recess, use PMI sheet as the main side wall of wheel rim body, avoid using all carbon fiber material, the material density of PMI sheet is far lower than carbon fiber composite material density, under the condition of same size, can greatly reduce the weight of wheel rim body, by PMI sheet and the first side wall part and second side wall part of carbon fiber material as the side wall of wheel rim body, the bending stiffness of this structure, shear deformation capacity is far superior to single layer or multilayer carbon fiber laminated structure, PMI is low-density high-performance core material, the cost price of material is far lower than carbon fiber material, PMI plus carbon fiber combination can significantly reduce total material cost under the premise of guaranteeing performance, relative to the mode of laying multiple long gauze pieces to replace gauze piece, can reach the purpose of saving carbon patch, while guaranteeing strength, prevent side wall recess due to high tire pressure.

Description

Technical Field

[0001] This utility model relates to the field of wheel rim technology, and in particular to a lightweight wheel rim that prevents sidewall denting. Background Technology

[0002] As people's living standards improve, the demand for high-end bicycles is increasing, and cycling is becoming more and more popular. People are starting to pursue lighter riding tools. Due to its lightness and strength, carbon fiber composite materials are very suitable for manufacturing lightweight bicycles. At present, the trend of "carbon fiberization" in high-end bicycles is becoming more and more obvious.

[0003] In the manufacturing process of wheel rims, composite materials are difficult to handle at the arc transitions and irregular mating areas. It is necessary to add fiber yarn sheets to meet the requirements of shape and strength. In particular, the sidewalls of the wheel rims are reinforced with yarn sheets to improve strength and aesthetics. The existing method of adding yarn sheets usually involves laying multiple layers of vertical strips of yarn sheets. Although the strength is improved, it not only increases the amount of composite material used and the material cost, but also makes the wheel rim relatively heavy. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a lightweight wheel rim that prevents side wall dents, so as to solve the problem that the existing patching method usually involves laying multiple layers of vertical strips of yarn, which can improve the strength, but not only increases the amount of composite material used and the material cost, but also makes the wheel rim relatively heavy.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a lightweight wheel rim for preventing sidewall denting, comprising a wheel rim body, wherein the wheel rim body includes: The inner patch layer includes a first tire connection portion, a first spoke connection portion, and two first sidewall portions, and the inner patch layer is made of carbon fiber. An outer patch layer is located outside the inner patch layer. The outer patch layer includes a second tire connection portion, a second spoke connection portion, and two second sidewall portions. The outer patch layer is made of carbon fiber. An intermediate patch layer is located between an inner patch layer and an outer patch layer. The intermediate patch layer includes two PMI sheets, each of which is located between a first sidewall portion and a second sidewall portion.

[0006] Preferably, the intermediate patch layer further includes a first intermediate patch and a second intermediate patch, wherein the first intermediate patch is located between the first tire connection portion and the second tire connection portion, and the second intermediate patch is located between the first spoke connection portion and the second spoke connection portion.

[0007] Preferably, the thickness of the PMI sheet is 0.3mm-1mm.

[0008] Preferably, the width of the PMI sheet is 15mm-100mm.

[0009] Preferably, both the first intermediate patch and the second intermediate patch are made of carbon fiber.

[0010] Preferably, the wheel rim body is hollow inside.

[0011] Compared with the prior art, the beneficial effects that this utility model can achieve are: Using PMI sheets as the main sidewalls of the wheel rim body avoids using all-carbon fiber material. The material density of PMI sheets is much lower than that of carbon fiber composites, which can greatly reduce the weight of the wheel rim body for the same size. By using PMI sheets and carbon fiber first and second sidewalls as the sidewalls of the wheel rim body, the bending stiffness and shear deformation resistance of this structure are far superior to single-layer or multi-layer carbon fiber composite structures. PMI is a low-density, high-performance core material, and its material cost is much lower than that of carbon fiber. The combination of PMI and carbon fiber can significantly reduce the total material cost while ensuring performance. Compared with the existing method of laying multiple layers of long strips of yarn to patch the yarn, it can save carbon fiber patches, while ensuring strength and preventing sidewall dents caused by high tire pressure. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of the wheel rim of this utility model; Figure 2 This utility model Figure 1 Cross-sectional structural diagram; Figure 3 This is a schematic diagram of the inner patch layer, middle patch layer and outer patch layer structure of this utility model; Figure 4 This is a schematic diagram of the PMI sheet structure of this utility model; The components are: 1. Wheel rim body; 11. Inner patch layer; 12. Middle patch layer; 121. PMI sheet; 122. First middle patch; 123. Second middle patch; 13. Outer patch layer. Detailed Implementation

[0013] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model is further described below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this utility model.

[0014] like Figures 1-3As shown, this utility model provides a lightweight wheel rim that prevents sidewall denting, including a wheel rim body 1, the wheel rim body 1 being hollow inside, and the wheel rim body 1 including an inner patch layer 11, an outer patch layer 13 and a middle patch layer 12; The inner patch layer 11 includes a first tire connection portion, a first spoke connection portion and two first sidewall portions. Each first sidewall portion is connected to one end of the first tire connection portion and one end of the first spoke connection portion at both ends, and the inner patch layer 11 is made of carbon fiber. The outer patch layer 13 is located outside the inner patch layer 11. The outer patch layer 13 includes a second tire connection part, a second spoke connection part, and two second sidewall parts. Each second sidewall part is connected to one end of the second tire connection part and the second spoke connection part at both ends. The outer patch layer 13 is made of carbon fiber. The intermediate patch layer 12 is located between the inner patch layer 11 and the outer patch layer 13. The intermediate patch layer 12 includes two PMI sheets 121, each of which is located between a first sidewall portion and a second sidewall portion. PMI sheet 121 is used as the main sidewall of the wheel rim body 1, avoiding the use of all carbon fiber materials. The material density of PMI sheet 121 is 30kg / m³-120kg / m³, which is much lower than the 1500kg / m³-1800kg / m³ of carbon fiber composite materials. Under the same size, the weight of the wheel rim body 1 can be greatly reduced. Using PMI sheet 121 and carbon fiber first and second sidewalls as the sidewalls of the wheel rim body 1, the bending stiffness and shear deformation resistance of this structure are far superior to single-layer or multi-layer carbon fiber composite structures. PMI is a low-density, high-performance core material, and its cost is much lower than that of carbon fiber. The combination of PMI and carbon fiber can significantly reduce the total material cost while ensuring performance. Compared with the existing method of patching with multiple layers of long strips of yarn, it can save carbon fiber patches while ensuring strength and preventing sidewall dents caused by high tire pressure.

[0015] like Figure 3 As shown, the intermediate patch layer 12 also includes a first intermediate patch 122 and a second intermediate patch 123. The first intermediate patch 122 is located between the first tire connection part and the second tire connection part, and the second intermediate patch 123 is located between the first spoke connection part and the second spoke connection part. Both the first intermediate patch 122 and the second intermediate patch 123 are made of carbon fiber, specifically carbon fiber yarn. The spoke joints and tire are the "performance-critical areas" of a wheel: the former needs to withstand multi-directional, alternating core loads, which determines the "structural safety" of the wheel; the latter needs to ensure sealing, wear resistance, and compression resistance, which determines the "functional reliability" of the wheel. The high strength, high modulus, low expansion, and high wear resistance of all-carbon fiber yarn can simultaneously meet the "performance upper limit requirements" of these two areas. If PMI foam or metal is used in these parts, it will either be unable to bear the core load.

[0016] like Figure 3 As shown, the thickness of PMI sheet 121 is 0.3mm-1mm; When the thickness of PMI sheet 121 is less than 0.3mm, the sidewall is prone to "excessive indentation" (deformation exceeding 2mm) due to lateral force when the vehicle is cornering (especially at high speeds), resulting in gaps at the contact point between the tire and the rim, which may cause tire "bulges" or "rim slippage". When the thickness of PMI sheet 121 is greater than 1mm, it will increase costs. At the same time, the stress characteristics of the wheel sidewall are "high surface stress and low internal stress" ("bending normal stress distribution" in materials mechanics: stress is proportional to the distance to the neutral axis). A PMI thickness of more than 1mm will cause the internal PMI material to be "insufficiently stressed". The stress borne by the inner layer of the sidewall is only less than 1 / 3 of that of the surface layer. This part of PMI is "functionally redundant" and cannot play a supporting role. Instead, the "excessive thickness" will cause uneven overall stiffness of the sidewall.

[0017] like Figure 4 As shown, the width of the PMI sheet 121 is 15mm-100mm, depending on the size of the wheel.

[0018] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lightweight wheel rim for preventing sidewall denting, comprising a wheel rim body (1), characterized in that: The wheel rim body (1) includes: The inner patch layer (11) includes a first tire connection part, a first spoke connection part and two first sidewall parts, and the inner patch layer (11) is made of carbon fiber. The outer patch layer (13) is located outside the inner patch layer (11). The outer patch layer (13) includes a second tire connection part, a second spoke connection part and two second sidewall parts. The outer patch layer (13) is made of carbon fiber. An intermediate patch layer (12) is located between an inner patch layer (11) and an outer patch layer (13). The intermediate patch layer (12) includes two PMI sheets (121), each of which is located between a first sidewall portion and a second sidewall portion.

2. The lightweight wheel rim for preventing sidewall denting according to claim 1, characterized in that: The intermediate patch layer (12) further includes a first intermediate patch (122) and a second intermediate patch (123), wherein the first intermediate patch (122) is located between the first tire connection portion and the second tire connection portion, and the second intermediate patch (123) is located between the first spoke connection portion and the second spoke connection portion.

3. The lightweight wheel rim for preventing sidewall denting according to claim 1, characterized in that: The thickness of the PMI sheet (121) is 0.3mm-1mm.

4. The lightweight wheel rim for preventing sidewall denting according to claim 1, characterized in that: The width of the PMI sheet (121) is 15mm-100mm.

5. The lightweight wheel rim for preventing sidewall denting according to claim 2, characterized in that: Both the first intermediate patch (122) and the second intermediate patch (123) are made of carbon fiber.

6. The lightweight wheel rim for preventing sidewall denting according to claim 1, characterized in that: The wheel rim body (1) is hollow inside.

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