Tool for motor rotor injection molding process

Abstract

The utility model discloses a tool for a motor rotor injection molding process, which comprises a support, the support comprises a platform, the lower side of the platform is provided with a first driving device, the platform is provided with a plurality of guide holes, any one guide hole is provided with a connecting rod, a connecting plate is arranged above the platform, and the connecting plate is connected with the platform. A lower shaft hole and a first heating device are arranged on the upper side of the platform, a mounting hole is formed in the middle of the connecting plate, an injection molding material chamber is arranged in the mounting hole, an upper shaft hole is formed in the injection molding material chamber, a second heating device is arranged on the lower side of the connecting plate, a support plate is arranged above the connecting plate, and a second driving device is arranged on the upper side of the support plate. A through hole is formed in the support plate, a plurality of injection rods are arranged on the bottom face of the second output plate, and a plurality of material cups are arranged in the injection molding material chamber. The beneficial effects of the utility model are that the risk of cracking between layers of the injection-molded iron core is reduced, and the NVH effect of the motor rotor is improved.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to a tool for processing motor rotors, and especially to a tooling for the injection molding process of motor rotors. Background Art

[0002] In the prior art, the permanent magnet motor rotor of a new energy vehicle drive motor adopts the process of inserting the shaft after injection molding. After injection molding, problems such as non-concentric installation holes of the iron core shaft may occur. After the shaft is inserted, problems such as cracking between layers of the injection-molded iron core occur. Such problems result in gaps between layers, which will affect the motor efficiency and NVH (Noise, Vibration, Harshness) performance. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a tooling for the injection molding process of motor rotors. The tooling for the injection molding process of motor rotors is to solve the technical problem that the injection molding process of the motor rotor in the prior art has non-concentric installation holes of the iron core shaft, thus affecting the motor efficiency and NVH performance.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A tooling for the injection molding process of motor rotors includes a bracket. The bracket includes a platform. A first driving device is arranged on the lower side of the platform. The first driving device includes an output shaft. The output shaft is arranged downward. The lower end of the output shaft is connected to the upper side of a first output plate. A plurality of guiding holes are arranged on the top of the platform. A connecting rod is arranged in any one of the guiding holes. The connecting rod and the guiding hole form a sliding pair along its axial direction. The lower end of any one of the connecting rods extends downward and is connected to the first output plate. A connecting plate is arranged above the platform. The upper end of the connecting rod extends upward and is connected to the connecting plate. A first heating device is arranged on the platform. An installation hole is arranged in the middle of the connecting plate. A plastic injection chamber is arranged in the installation hole. A second heating device is arranged on the connecting plate. A second driving device is arranged above the connecting plate. The lower end of the output shaft of the second driving device is connected to at least two injection rods. At least two material cups are arranged in the plastic injection chamber. The material cups are coaxial with the corresponding injection rods.

[0006] Further, a lower shaft hole is provided on the platform, an upper shaft hole is provided in the plastic injection chamber, the upper shaft hole and the lower shaft hole are coaxially arranged, the first heating device is arranged circumferentially on the outer periphery of the lower shaft hole, and the second heating device is arranged circumferentially on the outer periphery of the plastic injection chamber.

[0007] Further, a support plate is provided above the connecting plate, the support plate and the connecting plate are connected by a support member, the second driving device is arranged on the support plate, a through hole is provided on the support plate, and the output shaft of the second driving device passes through the through hole and extends downward.

[0008] Further, the lower end of the output shaft of the second driving device is connected to the upper side surface of a second output plate, and the injection plunger is arranged on the bottom surface of the second output plate.

[0009] Further, the bracket further includes four feet, and the feet are arranged on the bottom surface of the platform.

[0010] Further, the number of the shot sleeves is the same as that of the injection plungers, both the number of the injection plungers and the number of the shot sleeves are four, and the injection plungers and the shot sleeves are evenly arranged in the circumferential direction.

[0011] Further, the first driving device and the second driving device are oil cylinders or air cylinders.

[0012] Further, the first heating device and the second heating device are heating plates.

[0013] Working principle:

[0014] By changing the assembly process of the motor rotor, specifically, changing from injecting plastic first and then inserting the shaft to inserting the shaft first and then injecting plastic, the utility model ensures good assembly relationship among components inside the motor rotor after injection molding, and there will be no gaps, cracks or other conditions.

[0015] Compared with the prior art, the beneficial effects of the utility model are: reducing the risk of cracking between layers of the injection-molded iron core and improving the NVH effect of the motor rotor. Description of the drawings

[0016] Figure 1 is a three-dimensional schematic diagram of a tooling for the injection molding process of a motor rotor of the utility model.

[0017] Figure 2 is a side view schematic diagram of a tooling for the injection molding process of a motor rotor of the utility model.

[0018] Figure 3 is Figure 2Enlarged schematic view of part A Detailed implementation mode Embodiment

[0019] Please refer to Figure 1 、 Figure 2 、 Figure 3 The present utility model provides a technical solution:

[0020] A tooling for the injection molding process of a motor rotor, including a bracket. The bracket includes a platform 1. A first driving device 2 is arranged on the lower side of the platform 1. The first driving device 2 includes an output shaft which is arranged downward. The lower end of the output shaft is connected to the upper side surface of a first output plate 3. A plurality of guide holes are arranged on the top of the platform 1. A connecting rod 4 is arranged in any one of the guide holes. The connecting rod 4 and the guide hole form a sliding pair along its axial direction. The lower end of any one of the connecting rods 4 extends downward and is connected to the first output plate 3. A connecting plate 5 is arranged above the platform 1. The upper end of the connecting rod 4 extends upward and is connected to the connecting plate 5. A first heating device is arranged on the platform 1. An installation hole is arranged in the middle of the connecting plate 5. An injection plastic chamber 6 is arranged in the installation hole. A second heating device is arranged on the connecting plate 5. A second driving device 8 is arranged above the connecting plate 5. The lower end of the output shaft of the second driving device 8 is connected with at least two injection rods 10. The injection plastic chamber 6 is provided with at least two material cups. The material cups are coaxial with the corresponding injection rods 10.

[0021] Furthermore, a lower shaft hole is arranged on the platform 1, and an upper shaft hole is arranged in the injection plastic chamber 6. The upper shaft hole and the lower shaft hole are coaxially arranged. The first heating device is arranged circumferentially on the outer periphery of the lower shaft hole. The second heating device is arranged circumferentially on the outer periphery of the injection plastic chamber 6.

[0022] Furthermore, a support plate 7 is arranged above the connecting plate 5. The support plate 7 and the connecting plate 5 are connected by a support member. The second driving device 8 is arranged on the support plate 7. A through hole is arranged on the support plate 7. The output shaft of the second driving device 8 passes through the through hole and extends downward.

[0023] Furthermore, the lower end of the output shaft of the second driving device 8 is connected to the upper side surface of a second output plate 9. The injection rods 10 are arranged on the bottom surface of the second output plate 9.

[0024] Furthermore, the bracket further includes four feet which are arranged on the bottom surface of the platform 1.

[0025] Furthermore, the number of the material cups is the same as that of the injection rods 10. The number of both the injection rods 10 and the material cups is four. The injection rods 10 and the material cups are evenly arranged in the circumferential direction.

[0026] Furthermore, the first driving device 2 and the second driving device 8 are oil cylinders or air cylinders.

[0027] Further, the first heating device and the second heating device are heating plates.

[0028] Specifically, the material cup is in the shape of a through hole, which is used to temporarily store the preheated plastic injection cake and serve as a channel to guide the plastic injection cake into the rotor assembly after the plastic injection cake melts.

[0029] Working process:

[0030] Refer to Figure 1 、 Figure 2 、 Figure 3 as shown,

[0031] Pretreatment step: Assemble components such as the motor rotor shaft, iron core, and magnetic steel into the rotor assembly to be injection-molded.

[0032] Step 1: Place the rotor assembly assembled in the previous process on the upper side of platform 1.

[0033] This step can be completed manually or by a robot. The two ends of the shaft in the rotor assembly will extend beyond the upper and lower end faces of the rotor assembly. The upper and lower ends of the shaft need to be placed in the upper shaft hole and the lower shaft hole respectively to play a role in avoiding and positioning.

[0034] Step 2: Start the first driving device 2. The first driving device 2 pushes the first output plate 3 downward, drives the connecting plate 5 downward, and presses the bottom of the plastic injection chamber 6 against the upper part of the rotor assembly.

[0035] Step 3: Put the preheated plastic injection cake into the material cup of the plastic injection chamber 6.

[0036] During this step, keep the first heating device and the second heating device in the heating state to keep the plastic injection cake in a heated environment.

[0037] Step 4: Start the second driving device 8. The second driving device 8 pushes the injection rod 10 downward.

[0038] During this step, the injection rod 10 enters the material cup to push the plastic injection cake and presses the plastic injection cake into the magnetic steel groove of the rotor assembly. After the pressing is completed, the injection rod 10 continues to hold the pressure, and the holding time is adjusted according to the process, generally between 20s and 180s.

[0039] Step 5: Start the second driving device 8. The second driving device 8 retracts the injection rod 10 upward.

[0040] Step 6: Start the first driving device 2. The first driving device 2 pushes the connecting plate 5 upward to separate the plastic injection chamber 6 from the rotor assembly.

[0041] Step 6: Take out the rotor assembly and send it to the next working station.

[0042] Step 7, clean the residual injection molding material on the injection molding material chamber 6 and the injection plunger 10;

[0043] Step 8, repeat Step 1.

Claims

1. A tooling for the injection molding process of an electric motor rotor, characterized in that: It includes a bracket, and the bracket includes a platform (1). A first driving device (2) is provided on the lower side of the platform (1). The first driving device (2) includes an output shaft which is arranged downward. The lower end of the output shaft is connected to the upper side of a first output plate (3). A plurality of guiding holes are provided at the top of the platform (1). A connecting rod (4) is arranged in any one of the guiding holes. The connecting rod (4) and the guiding hole form a sliding pair along its axial direction. The lower end of any one of the connecting rods (4) extends downward and is connected to the first output plate (3). A connecting plate (5) is provided above the platform (1). The upper end of the connecting rod (4) extends upward and is connected to the connecting plate (5). A first heating device is provided on the platform (1). An installation hole is provided in the middle of the connecting plate (5). A plastic injection chamber (6) is arranged in the installation hole. A second heating device is provided on the connecting plate (5). A second driving device (8) is provided above the connecting plate (5). The lower end of the output shaft of the second driving device (8) is connected to at least two injection rods (10). At least two material cups are provided in the plastic injection chamber (6). The material cups are coaxial with the corresponding injection rods (10).

2. The tooling for the injection molding process of an electric motor rotor according to claim 1, characterized in that: A lower shaft hole is provided on the platform (1). An upper shaft hole is provided in the plastic injection chamber (6). The upper shaft hole and the lower shaft hole are coaxially arranged. The first heating device is arranged circumferentially on the outer periphery of the lower shaft hole. The second heating device is arranged circumferentially on the outer periphery of the plastic injection chamber (6).

3. The tooling for the injection molding process of an electric motor rotor according to claim 1, characterized in that: A support plate (7) is provided above the connecting plate (5). The support plate (7) and the connecting plate (5) are connected by a support member. The second driving device (8) is arranged on the support plate (7). A through hole is provided on the support plate (7). The output shaft of the second driving device (8) passes through the through hole and extends downward.

4. A tooling for the injection molding process of a motor rotor according to claim 1, characterized in that: The lower end of the output shaft of the second driving device (8) is connected to the upper side of a second output plate (9). The injection rods (10) are arranged on the bottom surface of the second output plate (9).

5. A tooling for the injection molding process of an electric motor rotor according to claim 1, characterized in that: The bracket further includes four feet which are arranged on the bottom surface of the platform (1).

6. The tooling for the injection molding process of a motor rotor according to claim 1, characterized in that: The number of the material cups is the same as that of the injection rods (10). The number of both the injection rods (10) and the material cups is four. The injection rods (10) and the material cups are evenly arranged in the circumferential direction.

7. The tooling for the injection molding process of an electric motor rotor according to claim 1, characterized in that: The first driving device (2) and the second driving device (8) are oil cylinders or air cylinders.

8. A tooling for the injection molding process of a motor rotor according to claim 1, characterized in that: The first heating device and the second heating device are heating plates.

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