A bracket for a middle motor of an electrically assisted bicycle
Patent Information
- Application Number
- CN202521835289.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-27
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-08-27
AI Technical Summary
[0007]本申请实施例通过提供一种电助力自行车中置电机用挂架，解决了现有技术中制造成本高、产品重量重、材料利用率低的问题
1、由于采用了降低制造成本：挂架主体的制造工艺由原来的热锻改为挤压成形，减少了模具成本和能耗，降低了生产过程中的材料损耗，从而有效降低了挂架的生产成本。减轻产品重量：挤压成形工艺能够在保证挂架强度的前提下，优化挂架主体的结构，使其不再像锻打成形的挂架那样结构厚重，进而减轻了电助力自行车的整体重量，改善了骑行体验。提高材料利用率：相较于锻打工艺需要对原材料进行多次锻造和切削加工，导致大量材料被作为废料去除的情况，挤压成形工艺减少了材料的浪费，显著提高了材料利用率。提升生产效率：挂架主体采用挤压成形工艺，左支架板和右支架板采用冲压工艺成形，这两种工艺都具有生产周期短、工序相对简单的特点，能够实现大规模批量生产，大大提高了生产效率，以满足日益增长的市场需求。改善外观质量：挤压成形工艺使得挂架主体表面更加光滑、美观，提升了产品的外观质量。增强通用性：通过更换不同的左支架板和右支架板，可以吊挂多种不同型号的电机，提高了挂架对不同电机型号的适配能力，增强了其通用性。
Smart Images
Figure CN224829475U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric-assisted bicycles, and in particular to a bracket for a mid-mounted motor in an electric-assisted bicycle. Background Technology
[0002] In existing technologies, the mid-mounted motor mount of electric-assist bicycles is generally manufactured using an aluminum alloy forging process. This traditional manufacturing process has the following significant defects and shortcomings: High manufacturing costs: The forging process requires high mold costs and energy consumption, and the material loss during processing is significant, resulting in high production costs for the racks.
[0003] Heavy product weight: Forged frame is often thick and heavy, which increases the overall weight of electric bicycle and affects the riding experience.
[0004] Low material utilization: The forging process requires multiple forging and cutting processes of raw materials, and a large amount of material is removed as waste, resulting in extremely low material utilization.
[0005] Low production efficiency: The forging process has a long production cycle and complex procedures, making it difficult to achieve large-scale mass production and unable to meet the growing market demand.
[0006] To address the aforementioned problems, the structure of the mid-drive motor mounting bracket provided by this utility model effectively solves the issues of high manufacturing cost, heavy weight, low material utilization, and low production efficiency in existing mounting brackets by changing the manufacturing process of the bracket body from hot forging to extrusion forming and using stamping to produce the left and right support plates. The extrusion forming process significantly improves material utilization and reduces production costs while ensuring the bracket's strength, and also makes the surface of the bracket body more aesthetically pleasing. The stamping process greatly improves the production efficiency of the left and right support plates, and by replacing different left and right support plates, it can be adapted to various motor models, improving the bracket's versatility. Utility Model Content
[0007] This application provides a hanger for a mid-mounted motor in an electric-assist bicycle, which solves the problems of high manufacturing cost, heavy product weight, and low material utilization in the prior art.
[0008] The technical solutions adopted in the embodiments of this application are as follows.
[0009] A hanger for a mid-mounted motor of an electric-assist bicycle includes a hanger body manufactured by extrusion molding and having positioning holes for mounting positioning pins; a left support plate mounted on the left side of the hanger body via positioning pins and fixing screws; and a right support plate mounted on the right side of the hanger body via positioning pins and fixing screws, wherein the left and right support plates are structurally symmetrical; at least four positioning pins are pressed into the positioning holes of the hanger body for positioning the left and right support plates; and at least eight fixing screws are used to fix the left and right support plates to the hanger body, wherein the threads of the fixing screws are coated with thread-locking adhesive.
[0010] As a further improvement to the above technical solution: the cross-sectional shape of the main body of the bracket is U-shaped or L-shaped, and bracket holes are provided on its two side walls.
[0011] As a further improvement to the above technical solution: both the left and right support plates are formed by stamping, and they are provided with mounting holes for installing the mid-mounted motor.
[0012] As a further improvement to the above technical solution: the positioning pin is a cylindrical pin, which is interference-fitted with the positioning hole of the bracket body.
[0013] As a further improvement to the above technical solution: the thread-fastening adhesive is an anaerobic adhesive or silicone, used to prevent the fixing screws from loosening.
[0014] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. Reduced Manufacturing Costs: The manufacturing process of the hanger body has been changed from hot forging to extrusion molding, reducing mold costs and energy consumption, and minimizing material waste during production, thus effectively lowering the production cost of the hanger. Reduced Product Weight: The extrusion molding process optimizes the structure of the hanger body while maintaining its strength, making it less bulky than forged hangers, thereby reducing the overall weight of the e-bike and improving the riding experience. Increased Material Utilization: Compared to forging, which requires multiple forging and cutting processes, resulting in significant material waste, extrusion molding reduces material waste and significantly improves material utilization. Increased Production Efficiency: The hanger body is extruded, while the left and right support plates are formed using stamping. Both processes have short production cycles and relatively simple procedures, enabling large-scale mass production and greatly improving production efficiency to meet growing market demand. Improved Appearance: The extrusion molding process makes the hanger body surface smoother and more aesthetically pleasing, improving the product's appearance quality. Enhanced versatility: By replacing different left and right bracket plates, various motor models can be suspended, improving the bracket's adaptability to different motor models and enhancing its versatility. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the hanging bracket for the mid-mounted motor of the electric-assist bicycle according to this utility model.
[0016] Figure 2 This is a cross-sectional schematic diagram of the bracket for the mid-mounted motor of an electric-assist bicycle according to this utility model.
[0017] In the diagram: 1. Hanger body; 2. Left bracket plate; 3. Right bracket plate; 4. Fixing screws; 5. Positioning pins; 6. Thread fastening adhesive; 7. Hanger holes. Detailed Implementation
[0018] This application provides a hanger for a mid-mounted motor in an electric-assist bicycle, which solves the problems of high manufacturing cost, heavy product weight, and low material utilization in the prior art.
[0019] The technical solution in this application embodiment is to solve the above problems, and the overall idea is as follows: To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0020] A hanger for a mid-mounted motor of an electric-assist bicycle includes a hanger body 1, which is manufactured by extrusion molding and has positioning holes for mounting positioning pins 5; a left support plate 2, which is mounted on the left side of the hanger body 1 by positioning pins 5 and fixing screws 4; and a right support plate 3, which is mounted on the right side of the hanger body 1 by positioning pins 5 and fixing screws 4. The left support plate 2 and the right support plate 3 are symmetrical in structure; at least four positioning pins 5 are pressed into the positioning holes of the hanger body 1 for positioning the left support plate 2 and the right support plate 3; and at least eight fixing screws 4 are used to fix the left support plate 2 and the right support plate 3 to the hanger body 1, with thread-locking adhesive 6 applied to the threads of the fixing screws 4.
[0021] The main body 1 of the bracket has a U-shaped or L-shaped cross-section, and bracket holes 7 are provided on its two side walls.
[0022] Both the left support plate 2 and the right support plate 3 are formed by stamping, and they are provided with mounting holes for installing the mid-drive motor.
[0023] The positioning pin 5 is a cylindrical pin, which is interference-fitted with the positioning hole of the bracket body 1.
[0024] The thread-fastening adhesive 6 is an anaerobic adhesive or silicone, used to prevent the fixing screw 4 from loosening.
[0025] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.
[0026] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
Claims
1. A mounting bracket for a mid-mounted motor of an electric-assist bicycle, characterized in that, The device includes a hanging frame body (1), which is made by extrusion molding and has positioning holes for installing positioning pins (5); a left bracket plate (2), which is installed on the left side of the hanging frame body (1) by positioning pins (5) and fixing screws (4); a right bracket plate (3), which is installed on the right side of the hanging frame body (1) by positioning pins (5) and fixing screws (4), and the left bracket plate (2) and the right bracket plate (3) are symmetrical in structure; at least 4 positioning pins (5) are pressed into the positioning holes of the hanging frame body (1) for positioning the left bracket plate (2) and the right bracket plate (3); at least 8 fixing screws (4) are used to fix the left bracket plate (2) and the right bracket plate (3) on the hanging frame body (1), and the threads of the fixing screws (4) are coated with thread fastening glue (6).
2. The mounting bracket for a mid-mounted motor of an electric-assist bicycle as described in claim 1, characterized in that, The cross-sectional shape of the main body (1) of the bracket is U-shaped or L-shaped, and bracket holes (7) are provided on its two side walls.
3. The mounting bracket for a mid-mounted motor of an electric-assist bicycle as described in claim 1, characterized in that, Both the left support plate (2) and the right support plate (3) are formed by stamping and have mounting holes for installing the mid-mounted motor.
4. The mounting bracket for a mid-mounted motor of an electric-assist bicycle as described in claim 1, characterized in that, The positioning pin (5) is a cylindrical pin that is interference-fitted with the positioning hole of the bracket body (1).
5. The mounting bracket for a mid-mounted motor of an electric-assist bicycle as described in claim 1, characterized in that, The thread fastening adhesive (6) is an anaerobic adhesive or silicone, used to prevent the fixing screw (4) from loosening.