Permanent magnet electric drive assembly bearing chamber wave spring mounting and fixing tool and using method thereof

Abstract

The invention discloses a permanent magnet electric drive assembly bearing chamber wave spring installing and fixing tool and a using method thereof.The tool comprises a base and a plurality of elastic clamping jaws, a positioning face and a connecting piece are arranged on the base, the multiple elastic clamping jaws are distributed in the circumferential direction of the base, one end of each elastic clamping jaw is fixedly connected with the base, and the other end of each elastic clamping jaw protrudes out of the base; and one end, protruding out of the base, of the elastic clamping jaw is in a reverse barb shape. The tool is provided with a plurality of elastic clamping jaws, the installation space of the elastic clamping jaws is reserved on the bearing chamber by drilling through holes or windowing and the like, so that the elastic clamping jaws in the tool extend into the bearing chamber, and the tool is integrally assembled at the bearing chamber through the positioning surface on the base and the connecting piece, so that the problem that when a stator and a rotor are assembled, the tool cannot be assembled easily is solved. And a flat gasket and a wave spring in a bearing chamber at the tail end of the motor fall off. And after the stator and the rotor are assembled, the rear bearing of the rotor is pressed into the bearing chamber and exerts withdrawing acting force on the elastic clamping jaw, so that the tool withdraws smoothly.

Description

Technical Field

[0001] The present invention relates to the technical field of electric drive systems for new energy vehicles, and in particular to a permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool and a use method thereof. Background Art

[0002] The electric drive system is a core component of new energy vehicles, responsible for converting electrical energy into mechanical power to propel the vehicle forward. It is usually composed of multiple components, including drive motors, motor controllers, transmission devices, etc. The development of the electric drive system directly affects the power output, energy efficiency, range and safety of new energy vehicles.

[0003] At present, new energy vehicles on the market mostly use permanent magnet motors as the driving device of the electric drive system. When using permanent magnet motors as the driving device of the electric drive system, the motor rotor and the input shaft of the reduction gearbox share three bearings, the motor has only a rear bearing, and a bearing chamber is provided on the motor housing. For the design of the bearing chamber, there are mainly wave spring + rear bearing + bearing inner cover structure, wave spring + rear bearing with fixed cover structure, and wave spring + rear bearing structure.

[0004] When a system using a permanent magnet motor as an electric drive adopts a wave spring + rear bearing structure, the bearing chamber axial space is less occupied, the product structure is simple, the bearing chamber structure size is the smallest, materials are saved, the overall cost is the lowest, and it has the most development and exploration value. However, at this stage, systems using permanent magnet motors as electric drives rarely use a wave spring + rear bearing structure, mainly because this structure has the following process assembly problems: Since the new energy electric drive system needs to reduce weight, the motor housing is made of aluminum alloy, and the end face of the bearing chamber is wear-resistant (the wave spring repeatedly squeezes the aluminum end face) and pits will be produced, so a flat pad needs to be added between the wave spring and the motor housing. For permanent magnet motors as electric drive systems, because the rotor is connected to the reducer through internal and external splines and the rotor is a permanent magnet structure, the rotor must be at the bottom when the stator and rotor of the permanent magnet motor are assembled, and the assembly equipment holds the rotor up and fixes the rotor through the middle hole to prevent the stator core and the rotor permanent magnet from being magnetically attracted and deflected during the assembly process. The stator part of the motor needs to be assembled from top to bottom with the bearing chamber facing downward, which will cause the flat washers and wave springs in the bearing chamber to fall out of the bearing chamber during the assembly process. Therefore, how to fix the wave springs and flat washers is the key and difficulty in the assembly process. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a device that can stably fix the flat washer and the wave spring in the bearing chamber with the opening facing downward, so that the stator and the rotor can automatically flip and load the material when the box is assembled. A permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool that can automatically clamp and fix, automatically close the box without falling, and can simply be recovered and reused, and a method for using the tool.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool comprises a base and a plurality of elastic claws, wherein a positioning surface and a connecting piece are provided on the base, and the plurality of elastic claws are distributed circumferentially along the base, one end of the elastic claw is fixedly connected to the base, and the other end of the elastic claw protrudes from the base, and the end of the elastic claw protruding from the base is in a reverse hook shape.

[0007] Preferably, there are three elastic claws distributed along the circumference of the base, the three elastic claws form a quasi-circular structure, one end of the elastic claw in the shape of a reverse barb has an arc structure protruding outward, and the arc structure of the three elastic claws forms a discontinuous drum ring.

[0008] Preferably, a positioning stop is provided on the base at a position connected to the elastic claw, the elastic claw is located at the positioning stop, and the elastic claw is fixedly connected to the base via a connecting bolt.

[0009] A method for using the above-mentioned permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tooling comprises the following steps: Step 1) machining a plurality of through holes at the bearing chamber of the motor housing, wherein the number and positions of the through holes correspond one-to-one to the elastic claws; Step 2) Extend the elastic claw from the outside of the bearing chamber through the through hole at the corresponding position into the bearing chamber, and connect the base to the bearing chamber through the positioning surface and the connecting piece; Step 3) Retract the elastic claws inwards and install the flat washer and wave spring in sequence, then push the elastic claws outwards and reset them to fix the wave spring and flat washer; Step 4) When assembling the stator and the rotor, the rear bearing of the rotor is pressed into the bearing chamber and an outward force is applied to the elastic claws, so that the elastic claws withdraw from the bearing chamber through the through hole and withdraw from the tooling.

[0010] Preferably, there are three elastic claws distributed along the circumference of the base, and the three elastic claws form a quasi-circular structure. The end of the elastic claw in the shape of a reverse hook has an arc structure protruding outward, and the arc structures of the three elastic claws form a discontinuous circular drum ring; and the diameter of the largest outer circle formed by the arc structures of the three elastic claws is larger than the inner diameter of the wave spring.

[0011] Preferably, the diameter of the largest outer circle formed by the three elastic claw arc structures is 4-7 mm larger than the inner diameter of the wave spring.

[0012] Preferably, the diameter of the largest outer circle formed by the three elastic claw arc structures is 5 mm larger than the inner diameter of the wave spring.

[0013] Preferably, the positioning surface on the base is an outer stop surface, and the connecting parts are a plurality of glass ball screws arranged at different circumferential positions of the base, and each of the glass ball screws is radially installed on the outer stop surface.

[0014] Preferably, the elastic claw is made of an elastic steel structure, elastic plastic, or elastic non-ferrous metal.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The tooling of the present invention is provided with three or more elastic claws, and installation space for the elastic claws is reserved on the bearing chamber by drilling holes or opening windows, so that the elastic claws in the tooling can be extended into the bearing chamber, and the tooling as a whole is assembled in the bearing chamber through the positioning surface and the connector on the base. The elastic claws are in the shape of reverse barbs, and a plurality of elastic claws are distributed to form a quasi-circular shape. The elastic claws are elastic, and the elastic claws shrink inward to cover the flat washers and wave springs, and then they are reset and stretched outward to fix the flat washers and wave springs in the bearing chamber, so as to solve the problem of the flat washers and wave springs falling off in the bearing chamber at the rear end of the motor when the stator and the rotor are combined. After the stator and the rotor are assembled, the rear bearing of the rotor is pressed into the bearing chamber and the withdrawal side force is applied to the elastic claws, and the tooling is smoothly withdrawn. The tooling is easy to recycle and can be reused.

[0016] 2. The present invention solves the problem of flat washers and wave springs falling off during assembly through tooling, so that the steel inserts in the bearing chamber can be replaced by flat washers, which significantly optimizes the motor housing processing technology (deep hole finishing of two soft and hard materials becomes deep hole processing of the same material), effectively saving processing costs and improving processing accuracy in mass production. Each unit saves 30 to 50 yuan in manufacturing costs (including insert casting and tool wear costs for finishing of two materials), and uses elastic claws to fix the wave spring, replacing the bearing inner cover and inner cover assembly, which saves the bearing inner cover or C-type clamp ring, and saves 5 to 10 yuan in manufacturing costs (including the cost of bearing chamber extension materials, bearing inner cover and C-type clamp ring) per unit, providing effective support for the mass production of permanent magnet electric drive systems.

[0017] 3. The invention solves the problem of wave spring falling off when the stator and rotor of the permanent magnet motor with the structure of wave spring + flat washer + rear bearing are assembled; solves the problem of wave spring falling off when the stator is flipped 180°; and provides a solid process manufacturing guarantee for the optimization of the electric drive structure.

[0018] 4. The tooling of the present invention is easy to manufacture, has a stable fixing method, is easy to assemble and disassemble, and tooling of different sizes is suitable for fixing with different types of wave springs.

[0019] 5. The present invention can stably fix the flat washer and the wave spring in the bearing chamber with the opening facing downward, so that the stator and the rotor can be automatically turned over and loaded, automatically clamped and fixed, and automatically closed without falling during the assembly, and the tooling can be simply recovered and reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 It is a structural schematic diagram of a permanent magnet motor electric drive system in the prior art; Attached Figure 2 A schematic structural diagram of a fixture for mounting a wave spring in a bearing chamber of a permanent magnet electric drive assembly according to the present invention; Attached Figure 3 A schematic diagram of the arrangement of through holes on the motor housing in the method for using the permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tooling of the present invention; Attached Figure 4 Structural dimension diagram of the flat washer of the permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tooling of the present invention; Attached Figure 5 A structural dimension diagram of a wave spring in a method for using a wave spring installation and fixing tool for a bearing chamber of a permanent magnet electric drive assembly of the present invention; Attached Figure 6 Structural dimension diagram of the elastic claw in the method for using the permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tooling of the present invention; Attached Figure 7 Structural dimension diagram of the base in the method for using the permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tooling of the present invention.

[0021] Explanation of the reference numerals: rotor 1, reduction gearbox input shaft 2, rear bearing 3, bearing chamber 4, wave spring 5, flat washer 6, motor housing 7, through hole 701, stator 8, elastic claw 9, base 10, connector 11, positioning surface 12. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0023] When using a permanent magnet motor as the driving device of an electric drive system, Figure 1 As shown, the rotor 1 of the motor and the input shaft 2 of the reduction box share three bearings, the motor has only a rear bearing 3, and a bearing chamber 4 is provided on the motor housing 7. For the design inside the bearing chamber 4, there are mainly wave spring + rear bearing + bearing inner cover structure, wave spring + rear bearing with fixed cover structure, and wave spring + rear bearing structure. The advantages and disadvantages of various structural forms are shown in Table 1.

[0024] Table 1: Advantages and disadvantages of various structural forms in the bearing chamber Structural form advantage shortcoming Wave spring + rear bearing + bearing inner cover 1. The axial fixed dimension control quality is stable and reliable; 2. The structure is adapted to the diameter of each shaft 1. The assembly is complicated, and an additional assembler is required to tighten the bolts; the labor cost is high; 2. The axial space is large, which is not conducive to reducing the volume; 3. The structural size of the bearing room becomes larger, and the material cost is high; Wave spring + rear bearing with fixed cover 1. The axial fixed dimension control quality is stable and reliable; 2. Compared with the inner cover structure, the axial space occupies less; 3. Compared with the inner cover structure, the bearing chamber structure size is smaller; 1. The assembly is complicated, and an additional assembler is required to tighten the bolts; the labor cost is high; 2. There are few models of bearings with fixed covers, and the price is high Wave spring + rear bearing 1. Small axial space occupation and simple product structure 2. Smallest bearing chamber structure size, saving materials 3. Lowest overall cost 1. The assembly structure is complex, the wave spring cannot be fixed, and batch manufacturing is difficult From the table above, we can see that the structure of wave spring + rear bearing takes up less axial space in the bearing chamber, has a simple product structure, has the smallest bearing chamber structure size, saves materials, has the lowest overall cost, and has the most development and mining value. However, at present, systems that use permanent magnet motors as electric drives rarely use the structure of wave spring + rear bearing, mainly because this structure has the following process assembly problems: 1. As the new energy electric drive system needs to reduce weight, the motor housing is made of aluminum alloy. The end surface of the bearing chamber is wear-resistant (the wave spring repeatedly squeezes the aluminum end surface) and pits will be produced, so a flat washer needs to be added between the wave spring and the motor housing. When assembling the flat washer and the wave spring, the opening of the bearing chamber should face upward.

[0025] 2. For permanent magnet motors as electric drive systems, because the rotor is connected to the reducer through internal and external splines, and the rotor is a permanent magnet structure rotor, the rotor must be at the bottom when the stator and rotor of the permanent magnet motor are assembled, and the assembly equipment holds the rotor against the rotor through the middle hole to prevent the rotor from shifting to prevent the stator core and the rotor permanent magnet from magnetically deflecting and sticking during the assembly process. The stator part of the motor needs to be assembled from top to bottom with the bearing chamber facing downward, which will cause the flat washer and wave spring in the bearing chamber to fall out of the bearing chamber during the assembly process.

[0026] 3. After the flat washers and wave springs are placed on the motor stator, it needs to be flipped 180°. At the same time, when the stator is fixed on the assembly equipment, it is subjected to a certain impact, and the flat washers and wave springs may fall off.

[0027] 4. Many bearings of new energy electric drive are oil-cooled, and flat washers and wave springs are not allowed to be fixed with grease. It involves oil and grease compatibility, oxidation resistance, etc.

[0028] In order to solve the problem of falling off easily when using flat washers and wave springs, this specific embodiment first provides a permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool, as shown in the attached Figure 2As shown, the tooling includes a base 10 and a plurality of elastic claws 9. A positioning surface 12 and a connecting piece 11 are provided on the base 10. In this specific embodiment, the positioning surface 12 is an outer stop surface, and the connecting piece 11 is a plurality of glass bead screws arranged at different positions around the base 10, and each glass bead screw is radially installed on the outer stop surface. A plurality of elastic claws 9 are distributed around the base 10, one end of the elastic claw 9 is fixedly connected to the base 10, and the other end of the elastic claw 9 protrudes from the base 10, and the end of the elastic claw 9 protruding from the base 10 is in a reverse hook shape. The elastic claw 9 is made of elastic steel structure, elastic plastic, or elastic non-ferrous metal.

[0029] In this specific embodiment, there are three elastic claws 9 distributed along the circumference of the base 10, and the three elastic claws 9 form a quasi-circular structure. The end of the elastic claw 9 in the reverse hook shape has an arc structure protruding outward, and the arc structure of the three elastic claws 9 forms a discontinuous drum ring. The diameter of the maximum outer circle formed by the arc structure of the three elastic claws 9 is greater than the inner diameter of the wave spring. In this specific embodiment, the diameter of the maximum outer circle formed by the arc structure of the three elastic claws 9 is 5 mm larger than the inner diameter of the wave spring.

[0030] In this specific embodiment, a positioning stop is provided at a position on the base 10 connected to the elastic claw 9, the elastic claw 9 is located at the positioning stop, and the elastic claw 9 is fixedly connected to the base 10 via a connecting bolt.

[0031] In addition, in this specific embodiment, a method for using a permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool is provided, comprising the following steps: Step 1) Process multiple through holes at the bearing chamber 4 of the motor housing 7, the number and position of the through holes corresponding to the elastic claws 9 one by one; Figure 3 As shown, three through holes 701 are reserved at the bearing chamber 4 of the motor housing 7, and three holes with a diameter of 8.5 are designed and processed to allow the elastic claws 9 on the tooling to extend into the bearing chamber 4 and contact the flat washer 6 and the wave spring 5.

[0032] Step 2) Extend the elastic claw 9 from the outside of the bearing chamber 4 through the through hole at the corresponding position into the bearing chamber 4, and the base 10 is connected to the bearing chamber 4 through the positioning surface 12 and the connector 11. In mass production, because the bearing chamber 4 is at the tail end of the motor, the installation of the components (flat washers, wave springs) is a deep hole installation, and the best ergonomics is to place and install from top to bottom. Therefore, the tooling installation should be installed from bottom to top. Lift it up from bottom to top through the electric cylinder. The fixing of the tooling is completed by the outer cylindrical stop glass bead screw on the base 10.

[0033] Step 3) Contract the elastic claw 9 inwards and install the flat washer 6 and wave spring 5 in sequence, then push the elastic claw 9 outwards and reset it to fix the wave spring 5 and flat washer 6. Because the inner circle size of the flat washer is smaller than the inner circle size of the wave spring, the inner circle size of the flat washer is as shown in the attached figure. Figure 4 The figure is ɸ59mm, the inner circle size of the wave spring is as shown in the attached Figure 5 As shown, it is ɸ61.15mm. First, install the flat washer, requiring that the inner circle size of the tooling elastic claw 9 after contraction must be less than ɸ59mm, and then install the wave spring, requiring that the inner circle size of the tooling after it is expanded outward and reset must be greater than ɸ61.15mm. Since the stator needs to be flipped 180° in the later stage, the bearing chamber opening faces downward, and the wave spring does not fall off, the inner circle size of the tooling after it is expanded outward and reset must be much greater than ɸ 61.15, which is ɸ 65mm in this specific embodiment. The tooling is made of spring steel material (60Si2Mn) and is heat treated (C45) to have good elasticity. At the same time, a special elastic claw 9 with a fishhook barb structure is designed, and the size of the elastic claw 9 is as shown in the attached figure. Figure 6 As shown, the size of the base 10 is as shown in the attached Figure 7 shown.

[0034] Step 4) When the stator and the rotor are assembled, the rear bearing of the rotor is pressed into the bearing chamber and an outward force is applied to the elastic claw 9, so that the elastic claw 9 withdraws from the bearing chamber through the through hole and withdraws from the tooling.

[0035] Compared with the prior art, the tooling of the present invention is provided with three or more elastic claws 9 on the base 10, the tooling is fixed at the tail end of the stator, and the installation space of the elastic claws 9 is reserved on the bearing chamber by drilling through holes or opening windows, so that the elastic claws 9 in the tooling can be extended into the bearing chamber, and the tooling is assembled as a whole in the bearing chamber through the positioning surface 12 and the connecting piece 11 on the base 10. The elastic claws 9 are in the shape of reverse barbs, and multiple elastic claws 9 are distributed to form a quasi-circular shape. The elastic claws 9 are elastic. The elastic claws 9 shrink inwardly to cover the flat washers and wave springs on them, and then the flat washers and wave springs are fixed in the bearing chamber by resetting and stretching outwards, so as to solve the problem of the flat washers and wave springs falling in the bearing chamber at the tail end of the motor when the stator and the rotor are combined. After the stator and the rotor are assembled, the rear bearing of the rotor is pressed into the bearing chamber and the withdrawal side force is applied to the elastic claws 9, and the tooling is smoothly withdrawn. The tooling is easy to recycle and can be reused.

[0036] The present invention solves the problem of flat washers and wave springs falling off during assembly through tooling, so that the steel inserts in the bearing chamber can be replaced by flat washers, and the motor housing processing technology is significantly optimized (deep hole finishing of two soft and hard materials becomes deep hole processing of the same material), and in mass production, it effectively saves processing costs and improves processing accuracy. Each unit saves 30 to 50 yuan in manufacturing costs (including insert casting and tool wear costs for finishing of two materials), and the elastic claw 9 is used to fix the wave spring, replacing the bearing inner cover and inner cover assembly, which saves the bearing inner cover or C-type clamp ring, and each unit saves 5 to 10 yuan in manufacturing costs (including the cost of bearing chamber extension materials, bearing inner cover and C-type clamp ring), providing effective support for the mass production of permanent magnet electric drive systems.

[0037] The invention solves the problem of wave spring falling off when the stator and rotor of a permanent magnet motor with a wave spring + flat washer + rear bearing structure is assembled; solves the problem of wave spring falling off when the stator is flipped 180 degrees; and provides a solid process manufacturing guarantee for the optimization of the electric drive structure.

[0038] The tooling of the invention is easy to manufacture, has a stable fixing method, is convenient to assemble and disassemble, and tooling of different sizes is suitable for fixing with wave springs of different models.

[0039] The present invention can stably fix the flat washer and the wave spring in the bearing chamber with the opening facing downward, so that the stator and the rotor can complete automatic flipping and loading, automatic clamping and fixing, and automatic closing without falling during the closing process, and the tooling can be simply recovered and reused.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. A permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool, characterized in that: It includes a base and a plurality of elastic claws, wherein a positioning surface and a connecting piece are provided on the base, wherein the plurality of elastic claws are distributed circumferentially along the base, wherein one end of the elastic claw is fixedly connected to the base, and the other end of the elastic claw protrudes from the base, and the end of the elastic claw protruding from the base is in the shape of a reverse hook.

2. The permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool according to claim 1 is characterized in that: There are three elastic claws distributed along the circumference of the base, and the three elastic claws form a circular structure. One end of the elastic claw in the reverse hook shape has an arc structure protruding outward, and the arc structure of the three elastic claws forms a discontinuous drum ring.

3. The permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool according to claim 1 is characterized in that: A positioning stop is provided on the base at a position connected to the elastic claw, the elastic claw is located at the positioning stop, and the elastic claw is fixedly connected to the base via a connecting bolt.

4. A method for using the permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool as claimed in claim 1, characterized in that: The following steps are involved: Step 1) machining a plurality of through holes at the bearing chamber of the motor housing, wherein the number and positions of the through holes correspond one-to-one to the elastic claws; Step 2) Extend the elastic claw from the outside of the bearing chamber through the through hole at the corresponding position into the bearing chamber, and connect the base to the bearing chamber through the positioning surface and the connecting piece; Step 3) Retract the elastic claws inwards and install the flat washer and wave spring in sequence, then push the elastic claws outwards and reset them to fix the wave spring and flat washer; Step 4) When assembling the stator and the rotor, the rear bearing of the rotor is pressed into the bearing chamber and an outward force is applied to the elastic claws, so that the elastic claws withdraw from the bearing chamber through the through hole and withdraw from the tooling.

5. The method for using the permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool according to claim 4 is characterized in that: There are three elastic claws distributed along the circumference of the base, and the three elastic claws form a quasi-circular structure. One end of the elastic claw in the shape of a reverse hook has an arc structure protruding outward, and the arc structures of the three elastic claws form a discontinuous drum ring shape; and the diameter of the largest outer circle formed by the arc structures of the three elastic claws is larger than the inner diameter of the wave spring.

6. The method for using the permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool according to claim 5 is characterized in that: The diameter of the largest outer circle formed by the arc-shaped structures of the three elastic claws is 4-7 mm larger than the inner diameter of the wave spring.

7. The method for using the permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool according to claim 6 is characterized in that: The diameter of the largest outer circle formed by the arc-shaped structures of the three elastic claws is 5 mm larger than the inner diameter of the wave spring.

8. The method for using the permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool according to claim 4 is characterized in that: The positioning surface on the base is an outer stop surface, and the connecting parts are a plurality of glass bead screws arranged at different positions around the base, and each of the glass bead screws is radially installed on the outer stop surface.

9. The method for using the permanent magnet electric drive assembly bearing chamber wave spring installation and fixing tool according to claim 4 is characterized in that: The elastic claw is made of an elastic steel structure, elastic plastic, or elastic non-ferrous metal.

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