An installation device for the flywheel snap spring of an electric bicycle driving motor

Abstract

The utility model discloses an installation equipment of electric bicycle drive motor flywheel snap spring, including base, cylinder, upper die, lower die, the cylinder body fixed connection on base of cylinder, the upper end fixed connection of upper die is on the top rod of cylinder, the lower die sets up the just below of upper die, and the lower die is the structure of small upper and big lower, and its diameter gradually increases from top to bottom, and the maximum diameter is not less than the outer diameter of motor shaft snap spring groove, and snap spring can be set on the lower die, when the top rod of cylinder drives upper die and moves down, the lower die is worn into upper die, and the lower end of upper die promotes snap spring and is along lower die and is installed in snap spring groove, prevents flywheel and falls off from motor shaft. As the installation equipment of electric bicycle drive motor flywheel snap spring, instead of the mode of installation of manual use of the present art grip snap spring pincers, realizes electric car flywheel snap spring's quick, accurate installation, promotes production efficiency, reduces manual labor intensity, guarantees the consistency of installation quality.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycle technology, and in particular to an installation device for a flywheel retaining spring of an electric bicycle drive motor. Background Technology

[0002] The flywheel is one of the core components of an electric vehicle's transmission system. It transmits power in one direction, directly engaging with the chain and motor shaft to transfer the rider's pedaling force to the rear wheel, propelling the vehicle forward. The flywheel circlip (also known as a clip) is the core component that secures the flywheel to the motor shaft, preventing it from coming loose during riding through elastic locking. Currently, the flywheel on the drive motor of electric bicycles is fixed using a circlip, requiring the use of circlip clamps for installation. This installation method has three main problems: 1. High labor intensity for operators during mass production, leading to hand fatigue and injuries over extended periods; 2. Installation quality is greatly affected by the operator's skill level, easily resulting in improper circlip installation, deformation, and other quality issues; 3. Low production efficiency, leading to high overall manufacturing costs for electric bicycles. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of the existing technology by providing an installation device for the flywheel retaining ring of an electric bicycle drive motor.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0005] An installation device for a flywheel retaining ring of an electric bicycle drive motor is characterized by comprising a base, a cylinder, an upper mold, and a lower mold. The cylinder body is fixedly connected to the base, the upper end of the upper mold is fixedly connected to the push rod of the cylinder, and the lower mold is positioned directly below the upper mold. The lower mold has a structure that is smaller at the top and larger at the bottom, with its diameter gradually increasing from top to bottom. The maximum diameter is not less than the outer diameter of the retaining ring groove on the motor shaft. The retaining ring can pass through the lower mold. When the push rod of the cylinder drives the upper mold to move downward, the lower mold passes into the upper mold, and the lower end of the upper mold pushes the retaining ring to move along the lower mold and engage in the retaining ring groove, preventing the flywheel from falling off the motor shaft.

[0006] Furthermore, the upper mold is a hollow cylindrical structure with a first opening on its side. When the upper mold moves from top to bottom along the lower mold, the first opening is gradually widened by the lower mold, and the inner surface of the bottom of the upper mold always abuts against the outer surface of the lower mold.

[0007] Furthermore, the lower mold is a hollow conical structure with a second opening on the side, and the cavity in the center is used to accommodate the motor shaft.

[0008] Furthermore, a connecting column is provided at the upper end of the lower mold, and the connecting column and the lower mold are an integral structure, with the connecting column connected to the base.

[0009] Furthermore, a flat key is connected to the side of the connecting post, and the connecting post is connected to the base via the flat key.

[0010] Furthermore, the thickness of the flat key is equal to the width of the retaining ring notch.

[0011] Furthermore, the flywheel is connected to the motor shaft via a spline.

[0012] Furthermore, the retaining ring groove is formed on the spline of the motor shaft.

[0013] Furthermore, the bottom of the lower mold is provided with an arc-shaped groove, which mates with the upper end face of the spline of the motor shaft.

[0014] Furthermore, the cylinder is a twin-shaft cylinder.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This utility model serves as an installation device for the flywheel retainer of an electric bicycle drive motor. It replaces the existing method of manual installation using gripping retainer pliers, enabling rapid and precise installation of the flywheel retainer, improving production efficiency, reducing manual labor intensity, and ensuring consistent installation quality.

[0017] Other features and advantages of this invention will be set forth in the following description or may be learned by practicing this invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the upper mold portion structure in an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the lower mold portion structure in an embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the snap ring groove portion of the motor shaft in an embodiment of the present utility model;

[0022] Figure 5 This is a diagram showing the fit between the lower mold and the motor shaft in an embodiment of this utility model.

[0023] Figure 6 This is a schematic diagram of the completed installation of the retaining ring in an embodiment of this utility model.

[0024] In the diagram: 1-base, 2-cylinder, 3-upper mold, 4-lower mold, 5-motor shaft, 6-circlip groove, 7-circlip, 8-flywheel, 9-connecting column, 10-flat key, 11-motor, 12-handle, 21-top rod, 31-first opening, 41-second opening, 42-groove, 51-spline. Detailed Implementation

[0025] To enhance understanding of this utility model, we will now describe it in further detail with reference to the accompanying drawings. This embodiment is only used to explain this utility model and does not constitute a limitation on the scope of protection of this utility model.

[0026] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," and "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] like Figure 1As shown, an installation device for a flywheel retaining ring of an electric bicycle drive motor includes a base 1, a cylinder 2, an upper mold 3, and a lower mold 4. The cylinder body of the cylinder 2 is fixedly connected to the base 1. The upper end of the upper mold 3 is fixedly connected to the push rod 21 of the cylinder 2. The lower mold 4 is located directly below the upper mold 3. The lower mold 4 has a structure that is smaller at the top and larger at the bottom, with its diameter gradually increasing from top to bottom. The maximum diameter is not less than the outer diameter of the retaining ring groove 6 on the motor shaft 5. The retaining ring 7 can pass through the lower mold 4. When the push rod 21 of the cylinder 2 drives the upper mold 3 to move downward, the lower mold 4 passes into the upper mold 3. The lower end of the upper mold 3 pushes the retaining ring 7 to move along the lower mold 4 and engage in the retaining ring groove 6, preventing the flywheel 8 from falling off the motor shaft 5.

[0030] like Figure 2 As shown, the upper mold 3 is a hollow cylindrical structure with a first opening 31 on the side. When the upper mold 3 moves from top to bottom along the lower mold 4, the first opening 31 is gradually widened by the lower mold 4, the bottom diameter of the upper mold 3 gradually increases, and elastic deformation occurs. The inner surface of the bottom of the upper mold 3 can always abut against the outer surface of the lower mold 4 to push the snap ring 7 on the lower mold 4 to move.

[0031] like Figure 3 As shown, the lower mold 4 is a hollow conical structure with a second opening 41 on its side, and its central cavity can accommodate the motor shaft 5. A cylindrical connecting post 9 is provided at the upper end of the lower mold 4. The connecting post and the lower mold 4 are an integral structure, and the connecting post 9 is connected to the base 1. A slot is cut into the side of the connecting post 9 and a flat key 10 is embedded therein. The connecting post 9 is connected to the base 1 via this flat key 10. The thickness of the flat key 10 is equal to the width of the notch in the retaining spring 7.

[0032] like Figure 4 As shown, the flywheel 8 is connected to the motor shaft 5 via a spline 51 on the surface of the motor shaft 5. A retaining ring groove 6 is formed on the spline 51 of the motor shaft 5. An arc-shaped groove 42 is provided at the bottom of the lower mold 4, which mates with the end face of the spline 51 of the motor shaft 5 to position and fix the relative position of the lower mold 4 and the motor shaft 5, so that the motor 11 will not move horizontally when the retaining ring 7 is installed.

[0033] Preferably, cylinder 2 is a dual-shaft cylinder. A handle 12 is connected to the side of the base 1.

[0034] The specific working process and principle of the above embodiments are as follows:

[0035] First, place the electric vehicle motor 11 horizontally on the work platform, aligning the motor shaft 5 directly below the lower mold 4; the operator grips the handle 12 on the side of the base to lower the entire installation equipment. Figure 5 As shown, the arc-shaped groove 42 at the bottom of the lower mold 4 comes into contact with the upper end face of the spline 51 of the motor shaft 5, at which point the motor 11 is fixed between the working platform and the snap ring mounting device.

[0036] Then the operator takes a retaining ring 7 and puts it on the lower mold 4. During the process of putting on the retaining ring 7, the retaining ring 7 enters the upper part of the lower mold 4 from the top of the connecting post 9 from top to bottom. At this time, the flat key 10 is just inserted into the notch of the retaining ring 7, so that the retaining ring 7 does not rotate during the pressing process and always maintains the same angle.

[0037] Next, cylinder 2 is activated. Under the action of the push rod 21 of cylinder 2, the upper mold 3 gradually moves downwards. When the upper mold 3 reaches the top position of the lower mold 4, because the lower mold 4 has a tapered structure that is smaller at the top and larger at the bottom, the diameter of the bottom surface of the upper mold 3 gradually increases during its descent. The first opening 31 undergoes elastic deformation and enlarges. The retaining spring 7 gradually descends under the push of the bottom of the upper mold 3, and at the same time, the diameter of the retaining spring 7 is gradually expanded by the lower mold 4 until the retaining spring 7 falls into the retaining spring groove 6 and returns to its original diameter. Figure 6 As shown, this completes the installation of the retaining ring 7.

[0038] Finally, raise the entire installation device and repeat the above steps to install the next retaining ring.

[0039] The above specific embodiments are only for illustrating the technical concept and structural features of this utility model, and are intended to enable those skilled in the art to implement them. However, the above content does not limit the protection scope of this utility model. Any equivalent changes or modifications made in accordance with the spirit and essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. An installation device for a flywheel retaining ring of an electric bicycle drive motor, characterized in that: The system includes a base (1), a cylinder (2), an upper mold (3), and a lower mold (4). The cylinder body of the cylinder (2) is fixedly connected to the base (1). The upper end of the upper mold (3) is fixedly connected to the push rod (21) of the cylinder (2). The lower mold (4) is located directly below the upper mold (3). The lower mold (4) has a structure that is smaller at the top and larger at the bottom. Its diameter gradually increases from top to bottom. The maximum diameter is not less than the outer diameter of the retaining ring groove (6) on the motor shaft (5). The retaining ring (7) can be inserted into the lower mold (4). When the push rod (21) of the cylinder (2) drives the upper mold (3) to move downward, the lower mold (4) enters the upper mold (3). The lower end of the upper mold (3) pushes the retaining ring (7) to move along the lower mold (4) and lock into the retaining ring groove (6) to prevent the flywheel (8) from falling off the motor shaft (5).

2. The installation device for the flywheel retaining ring of an electric bicycle drive motor according to claim 1, characterized in that: The upper mold (3) is a hollow cylindrical structure with a first opening (31) on the side. When the upper mold (3) moves from top to bottom along the lower mold (4), the first opening (31) is gradually widened by the lower mold (4), and the inner surface of the bottom of the upper mold (3) always abuts against the outer surface of the lower mold (4).

3. The installation device for the flywheel retaining ring of an electric bicycle drive motor according to claim 1, characterized in that: The lower mold (4) is a hollow conical structure with a second opening (41) on the side, and the cavity in the center is used to accommodate the motor shaft (5).

4. The installation device for the flywheel retaining ring of an electric bicycle drive motor according to claim 1, characterized in that: The upper end of the lower mold (4) is provided with a connecting column (9), and the connecting column (9) and the lower mold (4) are an integral structure. The connecting column (9) is connected to the base (1).

5. The installation device for the flywheel retaining ring of an electric bicycle drive motor according to claim 4, characterized in that: A flat key (10) is connected to the side of the connecting column (9), and the connecting column (9) is connected to the base (1) through the flat key (10).

6. The installation device for the flywheel retaining ring of an electric bicycle drive motor according to claim 5, characterized in that: The thickness of the flat key (10) is equal to the width of the notch in the retaining ring (7).

7. The mounting device for the flywheel retaining ring of an electric bicycle drive motor according to claim 2, characterized in that: The flywheel (8) is connected to the motor shaft (5) via a spline (51).

8. The mounting device for the flywheel retaining ring of an electric bicycle drive motor according to claim 7, characterized in that: The retaining ring groove (6) is formed on the spline (51) of the motor shaft (5).

9. The installation device for the flywheel retaining ring of an electric bicycle drive motor according to claim 8, characterized in that: The bottom of the lower mold (4) is provided with an arc-shaped groove (42), which is matched with the upper end face of the spline (51) of the motor shaft (5).

10. The mounting device for the flywheel retaining ring of an electric bicycle drive motor according to claim 1, characterized in that: The cylinder (2) is a twin-shaft cylinder.

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