Integrated large load axial electric drive device and mounting method

Abstract

The application discloses an integrated large-load axial electric driving device, which comprises a stator assembly and a rotor assembly; the stator assembly comprises a stator, and the stator is sleeved outside the rotor assembly; the rotor assembly comprises a rotor assembly; the rotor assembly comprises a rotor shaft assembly and an outer ring bearing; the rotor shaft assembly comprises a rotor shaft and a screw nut; the rotor shaft is connected with the screw nut; a permanent magnet is arranged on the outer periphery of the rotor shaft; the stator is located outside the permanent magnet; the application further discloses a hollow motor and controller integrated large-load axial electric driving installation method; the integrated large-load axial electric driving device adopts a hollow motor as a power unit to provide a rotating torque, and adopts a coaxial hollow motor and a ball screw pair; the product weight is reduced, the driver mute effect is optimized, and the flexibility of the whole vehicle arrangement is improved.

Description

Technical Field

[0001] This invention relates to the field of electric drive, specifically to an integrated high-load axial electric drive device and its installation method. Background Technology

[0002] The axial drive unit comprises a hollow brushless permanent magnet synchronous motor, an electronic controller, a motor angle sensor, ball bearing nut pairs, a lead screw, a tie rod, and other mechanical components. The hollow motor, as the power unit of the electric drive unit, can accommodate the motor-driven shaft parts, allowing them to rotate and move axially. Current technologies for converting electrical energy into mechanical energy generally employ worm gears for speed reduction and torque amplification. However, limitations in the strength, structure, and durability of the worm gear material (synthetic resin) make it difficult to achieve high thrust, failing to meet the demands of large vehicles. Other structures use pulleys and belts for speed reduction and torque amplification, but these also suffer from limitations in belt strength and durability, making it difficult to achieve high thrust, also failing to meet the needs of large vehicles. Therefore, there is an urgent need for a new speed reduction and torque amplification structure to address this situation. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated high-load axial electric drive device that can withstand large axial forces, has a simple structure, and lower cost.

[0004] To solve the above-mentioned technical problems, the present invention provides an integrated high-load axial electric drive device, including a stator assembly and a rotor assembly;

[0005] The stator assembly includes a stator, which is sleeved outside the rotor assembly;

[0006] The rotor assembly includes a rotor assembly;

[0007] The rotor assembly includes a rotor shaft assembly and an outer ring bearing;

[0008] The rotor shaft assembly includes a rotor shaft and a lead screw nut; the rotor shaft is fixedly connected to the lead screw nut; the stator is located outside the permanent magnet.

[0009] The outer ring bearing includes a first outer ring, a second outer ring, and steel balls;

[0010] The first outer ring and the second outer ring surround the lead screw nut to form an annular steel ball raceway, and the steel ball is placed inside the annular steel ball raceway.

[0011] Preferably, the lead screw nut has a first annular steel ball raceway on its outer periphery, a second steel ball raceway on its first outer ring, and a third steel ball raceway on its second outer ring; the first annular steel ball raceway, the second steel ball raceway, and the third steel ball raceway together form an annular steel ball raceway.

[0012] Preferably, the electric drive device further includes an end cap;

[0013] The end cap is disposed on the outer periphery of the lead screw nut;

[0014] The outer ring bearing is located inside the end cover;

[0015] A locking nut is provided on the outer side of the outer ring bearing. The locking nut passes through the screw hole on the end cover and abuts against the second outer ring in the outer ring bearing. The locking nut is used to fix the second outer ring and the first outer ring to the inner side wall of the end cover in sequence.

[0016] Preferably, an adjustment shim is provided between the first outer ring and the second outer ring.

[0017] Preferably, the outer periphery of one end of the rotor shaft protrudes outward to form a first step; the tail end of the rotor shaft is connected to the lead screw nut through the first step; the first step is used for positioning when the rotor shaft and the lead screw nut are assembled.

[0018] The outer periphery of the rotor shaft protrudes outward at a distance from the first step to form a second step; the retaining ring is sleeved on the rotor shaft and abuts against the second step; the second step is used to restrict the axial movement of the retaining ring.

[0019] The rotor shaft is provided with a permanent magnet between the first step and the second step; the stator is located outside the permanent magnet.

[0020] A deep groove ball bearing is provided on the outer circumference of the rotor shaft, and a wave spring is provided between the retaining ring and the deep groove ball bearing; the wave spring is used to eliminate the gap between the deep groove ball bearing and the outer ring bearing.

[0021] Preferably, the electric drive device further includes a housing;

[0022] The stator, deep groove ball bearing, and rotor assembly are all housed within the housing.

[0023] The end cap is fixedly mounted on the housing.

[0024] Preferably, the housing is provided with a motor position signal connector hole, one end of the motor position sensor connector is connected to the circuit board, and the other end is plugged into the pins of the motor position sensor;

[0025] The housing is provided with a motor power connector hole. One end of the motor power connector is connected to the circuit board, and the other end is soldered to the motor's busbar.

[0026] Preferably, the rotor shaft is interference-fitted with the lead screw nut.

[0027] The present invention also provides an installation method for an integrated high-load axial electric drive device, comprising the following steps:

[0028] The rotor shaft is fixed to the lead screw nut, and the permanent magnet and wave spring are assembled onto the rotor shaft; one end of the wave spring abuts against the second step.

[0029] Install the deep groove ball bearing and stator into the housing;

[0030] After one end of the lead screw nut passes through the end cover and is fixed, the first outer ring, steel ball, adjusting shim and second outer ring are placed into the end cover and fixed in sequence.

[0031] Fix the end cap to the housing, and place the rotor shaft and lead screw nut into the housing so that the deep groove ball bearing abuts against the other end of the wave spring, and the stator is located outside the permanent magnet.

[0032] Preferably, the method for selecting the adjusting shim specifically includes the following steps:

[0033] Obtain the span distance A of the first annular steel ball raceway; assuming the standard span distance is A0, calculate the span distance difference ΔA between span distance A and the standard span distance A0;

[0034] Obtain the initial outer ring spacing B between the first outer ring and the second outer ring; calculate the target thickness s based on the initial outer ring spacing B and the span difference ΔA.

[0035] Select the appropriate adjustment shim based on the target thickness s.

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] 1. A hollow rotor is used, with the lead screw passing through inside the rotor, reducing the installation space;

[0038] 2. A lead screw nut is interference-fitted to the rotor shaft, enabling synchronous rotation between the lead screw nut and the rotor shaft, and effectively transmitting the motor torque to the nut;

[0039] 3. The lead screw nut has a first annular steel ball raceway on its outer circumference and two outer rings with grooves of about a quarter circle. The first annular steel ball raceway of the lead screw nut and the steel ball raceways of the two outer rings form a four-point contact ball bearing. Because the outer ring of the four-point ball bearing adopts a split structure, more steel balls can be installed, so it can withstand greater axial and radial forces.

[0040] 4. An adjusting shim is provided between the two outer rings to adjust the bearing clearance and improve the transmission stiffness of the drive unit;

[0041] 5. The first annular steel ball raceway and the steel ball raceways of the two outer rings of the lead screw nut form a four-point contact ball bearing. An oil seal is provided between the bearing grease and the stator to prevent bearing grease from overflowing onto the stator assembly and rotor assembly.

[0042] 6. The first annular steel ball raceway and the steel ball raceways of the two outer rings of the lead screw nut form a four-point contact ball bearing. A cage is provided inside to prevent friction between adjacent steel balls, which would lead to excessive wear of the entire bearing.

[0043] 7. The bearing composed of the lead screw nut, steel ball, and outer ring serves as a support bearing at one end of the motor rotor shaft and can withstand large axial forces.

[0044] 8. Two through holes are provided on the motor housing: one for the motor's power connector and the other for the motor position sensor signal connector. The controller circuit board is mounted on the motor housing, with the power connector and motor position signal connector connecting the controller circuit board to the motor. The motor power connector is soldered to the motor busbar, while the motor position sensors are connected via plug-in connections. The circuit board and motor are directly connected via connectors, reducing the number of connecting wires and connectors at the other end of the wires, lowering costs, reducing defects caused by soldering, and improving EMC performance. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of an integrated high-load axial electric drive device according to the present invention;

[0046] Figure 2 This is a schematic diagram of the outer ring bearing.

[0047] Figure 3 This is a schematic diagram of the assembly of the end cap and the housing;

[0048] Figure 4 This is a schematic diagram of the rotor shaft being pressed into the lead screw nut;

[0049] Figure 5 This is a schematic diagram of the permanent magnet being assembled onto the rotor shaft;

[0050] Figure 6 This is a schematic diagram of the rotor shaft assembly;

[0051] Figure 7 This is a schematic diagram of a deep groove ball bearing installed in a housing;

[0052] Figure 8 This is a schematic diagram of the structure where the stator is installed into the housing;

[0053] Figure 9 This is a schematic diagram of the structure of the oil seal being inserted into the end cap;

[0054] Figure 10 This is a schematic diagram of the structure in which the outer ring bearing is used in conjunction with the rotor shaft;

[0055] Figure 11 This is a schematic diagram of the rotor assembly;

[0056] Figure 12 This is a schematic diagram of the end cover and rotor assembly installed in the housing;

[0057] Figure 13 This is a schematic diagram of the motor position sensor assembled onto the housing;

[0058] Figure 14 This is a schematic diagram of the sensor target plate being assembled onto the rotor shaft;

[0059] Figure 15 This is a schematic diagram of the motor power connector being assembled onto the circuit board.

[0060] Figure 16 This is a schematic diagram of the structure for assembling the controller connector onto the controller cover;

[0061] Figure 17 This is a side view of the integrated high-load axial electric drive device of the present invention.

[0062] Figure 18 This is a cross-sectional view of an integrated high-load axial electric drive device according to the present invention.

[0063] In the diagram, the correspondence between the components and the reference numerals is as follows:

[0064] 1-Housing, 2-Stator, 3-Permanent magnet, 4-Rotor shaft, 5-Oil seal, 6-O-ring seal, 7-First outer ring, 8-Adjusting shim, 9-Second outer ring, 10-Cage, 11-End cap, 12-Locking nut, 13-Lead screw nut, 14-Steel ball, 15-Controller connector, 16-Connector pin, 17-Motor power connector, 18-Circuit board, 19-Retaining ring, 20-Wave spring, 21-Motor position signal connector, 22-Motor position sensor, 23-Sensor target plate, 24-First bolt, 25-Deep groove ball bearing, 31-Second bolt, 35-Controller cover, 36-O-ring seal. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] The present invention will now be described in further detail with reference to the accompanying drawings:

[0067] This invention provides an integrated high-load axial electric drive device, such as... Figure 1 As shown, it includes a stator assembly and a rotor assembly;

[0068] The stator assembly includes a stator 2, which is sleeved outside the rotor assembly;

[0069] The rotor assembly includes the rotor assembly;

[0070] The rotor assembly includes a rotor shaft assembly 28 and an outer ring bearing 41;

[0071] The rotor shaft assembly 28 includes a rotor shaft 4 and a lead screw nut 13; the tail end of the rotor shaft 4 is inserted into the lead screw nut 13, and the two are interference-fitted 27. The lead screw nut 13 and the rotor shaft 4 rotate synchronously, and the motor torque is effectively transmitted to the lead screw nut 13.

[0072] The outer ring bearing 41 supports the rotor shaft 4 and withstands the radial pressure of the rotor shaft 4. The outer ring bearing 41 includes a first outer ring 7, a second outer ring 9, and steel balls 14.

[0073] A first annular steel ball raceway 37 is provided on the outer circumference of the lead screw nut 13. The cross-sections of the first outer ring 7 and the second outer ring 9 respectively have a second steel ball raceway 39 and a third steel ball raceway 40 with approximately one-quarter circumference. Figure 2 (As shown); the first annular steel ball raceway 37, the second steel ball raceway 39 and the third steel ball raceway 40 together form an annular steel ball raceway, and the steel ball 14 is placed in the annular steel ball raceway and rolls.

[0074] The first outer ring 7 and the second outer ring 9 form the outer ring portion of the outer ring bearing 41, and the lead screw nut 13 forms the inner ring portion of the outer ring bearing 41. The two do not contact each other directly.

[0075] In the above embodiments, preferably, an integrated high-load axial electric drive device further includes an end cap 11;

[0076] The end cover 11 is bolted to the mounting carrier, thereby transferring the axial force on the lead screw to the mounting carrier, reducing the axial force on the motor rotor assembly and stator assembly, and improving the axial bearing capacity of the motor.

[0077] The end cap 11 is also fixedly installed on the outer periphery of the lead screw nut 13; an oil seal 5 is provided between the end cap 11 and the lead screw nut 13.

[0078] An adjusting shim 8 is provided between the first outer ring 7 and the second outer ring 9 to adjust the bearing clearance of the outer ring bearing 41. When the thickness of the adjusting shim 8 increases, the distance between the first outer ring 7 and the second outer ring 9 increases, and the clearance of the outer ring bearing 41 increases; conversely, when the thickness of the adjusting shim 8 decreases, the distance between the first outer ring 7 and the second outer ring 9 decreases, and the clearance of the outer ring bearing 41 decreases.

[0079] The outer ring bearing 41 is located inside the end cover 11 and serves as a support bearing for one end of the rotor assembly;

[0080] A locking nut 12 is provided on the outer side of the outer ring bearing 41. The locking nut 12 passes through the screw hole on the end cover 11 and abuts against the second outer ring 9 in the outer ring bearing 41. The second outer ring 9, the adjusting shim 8 and the first outer ring 7 are fixed to the inner wall of the end cover 11 in sequence by the locking nut 12.

[0081] In this embodiment, when the motor rotates, the rotor shaft 4 and the lead screw nut 13 rotate synchronously due to the interference fit 27. At this time, the lead screw nut 13 converts the rotational motion of the rotor shaft 4 into the axial motion of the lead screw through the internal threaded lead screw transmission pair. The axial force on the lead screw is then transmitted to the end cover 11 through the outer ring bearing 41 composed of the lead screw nut 13, steel ball 14, first outer ring 7, second outer ring 9, and adjusting shim 8. The end cover 11 is fixed to the mounting carrier with bolts, thereby transmitting the axial force on the lead screw to the mounting carrier, reducing the axial force on the motor assembly and stator assembly, and improving the axial bearing capacity of the motor.

[0082] In the above embodiment, preferably, the outer periphery of the tail end of the rotor shaft 4 protrudes outward to form a first step 42; the tail end of the rotor shaft 4 is connected to the lead screw nut 13 through the first step 42; the first step 42 is used for positioning when the rotor shaft 4 and the lead screw nut 13 are assembled.

[0083] The outer periphery of the rotor shaft 4 protrudes outward at a distance from the first step 42 to form a second step 43; the retaining ring 19 is sleeved on the rotor shaft 4 and abuts against the second step 43, and the second step 43 is used to restrict the axial movement of the retaining ring 19.

[0084] The first step 42 and the second step 43 are set sequentially from the tail end to the head end of the rotor shaft 4;

[0085] A permanent magnet 3 is also installed on the outer periphery of the rotor shaft 4, and the permanent magnet 3 is located between the first step 42 and the second step 43.

[0086] A deep groove ball bearing 25 is also installed on the outer periphery of the rotor shaft 4, and a wave spring 20 is disposed between the retaining ring 19 and the deep groove ball bearing 25.

[0087] Wave spring 20 is used to eliminate the clearance between deep groove ball bearing 25 and outer ring bearing 41: one end of wave spring 20 contacts the retaining ring 19 on the second step 43 of rotor shaft 4, and the other end contacts the inner ring end face of deep groove ball bearing 25. Rotor shaft 4 and lead screw nut 13 are interference-fitted, and the first annular steel ball raceway 37 of lead screw nut 13 is the inner ring portion of outer ring bearing 41. Essentially, the inner ring portion of outer ring bearing 41 includes lead screw nut 13 and rotor shaft 4. Therefore, one side of wave spring 20 contacts the inner ring end face of deep groove ball bearing 25, and the other side can be considered to be in contact with outer ring bearing 41, thus eliminating the clearance between the deep groove ball bearing 25 and outer ring bearing 41. This achieves buffering during motor rotation direction reversal and eliminates noise. Figure 6 As shown.

[0088] In the above embodiments, preferably, an integrated high-load axial electric drive device further includes a housing 1;

[0089] The stator 2, deep groove ball bearing 25 and rotor assembly are all fixedly installed in the housing 1.

[0090] In the above embodiment, preferably, the end cover 11 has a through hole 33, and the end face of the housing 1 has a threaded hole 32. The through hole 33 and the threaded hole 32 are coaxial, and the bolts are used to fix the entire motor by engaging the through hole 33 and the threaded hole 32. Figure 3 As shown.

[0091] In the above embodiment, preferably, an O-ring seal 6 is provided between the end cap 11 and the housing 1.

[0092] In the above embodiment, preferably, a motor position signal connector hole 45 is provided on the housing 1, one end of the motor position sensor connector 21 is connected to the circuit board 18, and the other end is plugged into the pin of the motor position sensor 22, which is simple and convenient to install.

[0093] The housing 1 is provided with a motor power connector hole 44. One end of the motor power connector 17 is connected to the circuit board 18, and the other end is soldered to the motor busbar. There is no additional power line between the motor and the circuit board 18, which reduces the number of wires and connectors at the other end of the wires, thus reducing costs.

[0094] In the above embodiments, preferably, the lead screw nut 13 is connected to the lead screw through its internal thread 38 to form a ball screw pair.

[0095] In the above embodiments, preferably, the rotor shaft 4 is a hollow motor shaft.

[0096] In the above embodiments, preferably, a retainer 10 is also provided inside the annular steel ball raceway.

[0097] This invention relates to an integrated high-load axial electric drive device that uses a hollow motor as the power unit to provide rotational torque, which is then converted into axial high-load thrust via a ball screw pair. This eliminates the worm gear structure, employing a coaxial hollow motor and ball screw pair, resulting in reduced product weight, optimized drive noise reduction, and improved vehicle layout flexibility. Furthermore, the hollow motor has a simple structure, allowing for individual manufacturing, packaging, and transportation, leading to low manufacturing costs. The assembled integrated high-load axial electric drive device boasts high integration and can be used as a common component to derive multiple product models, demonstrating broad market prospects.

[0098] This invention also discloses a method for axially mounting a hollow motor and controller under high load, comprising the following steps:

[0099] 1) Press one end of the rotor shaft 4 into the lead screw nut 13, and measure the span A of the first annular steel ball raceway 37, such as... Figure 4 As shown.

[0100] 2) Let the standard span distance be A0, then the difference between the span distance A of the first annular steel ball raceway 37 of the lead screw nut 13 and the span distance A0 of the standard lead screw nut 13a is △A=A0-A;

[0101] 3) Assemble the permanent magnet 3 onto the rotor shaft 4, such as... Figure 5 As shown;

[0102] 4) Assemble the retaining ring 19 onto the rotor shaft 4, making it abut against the second step 43; then assemble the wave spring 20 onto the rotor shaft 4, making one end abut against the retaining ring 19; thus forming the rotor shaft assembly 28, as shown. Figure 6 As shown;

[0103] 5) Install the deep groove ball bearing 25 into housing 1, as follows: Figure 7 As shown;

[0104] 6) Install the stator 2 into the housing 1, as follows: Figure 8 As shown;

[0105] 7) Install the oil seal 5 into the end cap 11, as follows: Figure 9 As shown;

[0106] 8) Obtain the initial outer ring spacing B; calculate the target thickness s based on the initial outer ring spacing B and the difference between the spans ΔA; select the appropriate adjustment shims 8 based on the target thickness s;

[0107] First, assemble the first outer ring 7, the second outer ring 9, the cage 10, and the steel ball 14 onto the lead screw nut 13. Measure the distance between the first outer ring 7 and the second outer ring 9 at this point, and use this distance as the initial outer ring spacing B. Figure 10 As shown; thus, the target thickness s is obtained, and the target thickness s is used as the thickness of the adjusted shim 8;

[0108] s = B - △A

[0109] This step allows for the adjustment to obtain a reasonable bearing clearance.

[0110] 9) Pass the rotor shaft assembly 28 through the inner hole of the end cover 11, place the first outer ring 7 into the end cover 11, then place the cage 10, and then place the steel ball 14 into the steel ball hole of the cage 10. Next, place the adjusted shim 8 and the second outer ring 9 in sequence; finally, install the lock nut 12 and apply torque to tighten it. Assemble the O-ring seal 6 onto the end cover 11. This forms the end cover 11 and rotor assembly 29. Figure 11 As shown;

[0111] 10) Install the end cover 11 and the rotor assembly 29 into the housing 1, and fix the end cover 11, the rotor assembly 29 and the housing 1 with the second bolt 31.

[0112] 11) Assemble the motor position sensor 22 onto the housing and secure it with the first bolt 24. (Example:) Figure 13 As shown.

[0113] 12) Assemble the sensor target plate 23 onto the rotor shaft 4, as follows: Figure 14 As shown.

[0114] 13) Assemble the circuit board 18 onto the housing 1, and assemble the motor position sensor signal connector 21 onto the sensor target plate 23; assemble one end of the motor position sensor signal connector 21 onto the circuit board 18, and insert the other end into the pin of the motor position sensor 22.

[0115] 14) Assemble one end of the motor power connector 17 onto the circuit board 18, and solder the other end to the motor busbar. (Example:) Figure 15 As shown.

[0116] 15) Assemble the controller connector 15 onto the controller cover 35, then assemble the controller cover 35 onto the housing 1, and tighten the mounting screws of the controller cover 35. Figure 16 As shown. Assembly complete.

[0117] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An integrated high-load axial electric drive device, characterized in that: Includes stator assembly and rotor assembly; The stator assembly includes a stator (2), which is sleeved on the outside of the rotor assembly; The rotor assembly includes a rotor assembly; The rotor assembly includes a rotor shaft assembly (28) and an outer ring bearing (41). The rotor shaft assembly (28) includes a rotor shaft (4) and a lead screw nut (13); one end of the rotor shaft (4) is fixedly connected to the lead screw nut (13); a permanent magnet (3) is provided on the rotor shaft (4); the stator (2) is located outside the permanent magnet (3); The outer ring bearing (41) includes a first outer ring (7), a second outer ring (9), and a steel ball (14); the first outer ring (7) and the second outer ring (9) are both sleeved on the outside of the lead screw nut (13); the first outer ring (7) and the second outer ring (9) form an annular steel ball raceway on the lead screw nut (13), and the steel ball (14) is placed inside the annular steel ball raceway; An adjustment shim (8) is provided between the first outer ring (7) and the second outer ring (9).

2. The integrated high-load axial electric drive device according to claim 1, characterized in that: The lead screw nut (13) has a first annular steel ball raceway (37) on its outer periphery, a second steel ball raceway (39) on its first outer ring (7), and a third steel ball raceway (40) on its second outer ring (9); the first annular steel ball raceway (37), the second steel ball raceway (39) and the third steel ball raceway (40) together form an annular steel ball raceway.

3. The integrated high-load axial electric drive device according to claim 2, characterized in that: The electric drive unit also includes an end cap (11). The end cap (11) is disposed on the outer periphery of the lead screw nut (13); The outer ring bearing (41) is located inside the end cap (11); A locking nut (12) is provided on the outer side of the outer ring bearing (41). The locking nut (12) passes through the screw hole on the end cover (11) and abuts against the second outer ring (9) in the outer ring bearing (41). The second outer ring (9) and the first outer ring (7) are fixed to the inner wall of the end cover (11) in sequence by the locking nut (12).

4. The integrated high-load axial electric drive device according to claim 3, characterized in that: The outer periphery of one end of the rotor shaft (4) protrudes outward to form a first step (42); the tail end of the rotor shaft (4) is connected to the lead screw nut (13) through the first step (42); the first step (42) is used for positioning when the rotor shaft (4) and the lead screw nut (13) are assembled. The outer periphery of the rotor shaft (4) protrudes outward at a distance from the first step (42) to form a second step (43); the retaining ring (19) is sleeved on the rotor shaft (4) and abuts against the second step (43); the second step (43) is used to restrict the axial movement of the retaining ring (19); The rotor shaft (4) has a permanent magnet (3) disposed between the first step (42) and the second step (43); the stator (2) is located outside the permanent magnet (3); The outer periphery of the rotor shaft (4) is provided with a deep groove ball bearing (25), and a wave spring (20) is provided between the retaining ring (19) and the deep groove ball bearing (25); the wave spring (20) is used to eliminate the gap between the deep groove ball bearing (25) and the outer ring bearing (41).

5. An integrated high-load axial electric drive device according to claim 4, characterized in that: The electric drive unit also includes a housing (1); The stator (2), deep groove ball bearing (25) and rotor assembly are all housed inside the housing (1); The end cap (11) is fixedly mounted on the housing (1).

6. The integrated high-load axial electric drive device according to claim 5, characterized in that: The housing (1) is provided with a motor position signal connector hole (45). One end of the motor position sensor connector (21) is connected to the circuit board (18), and the other end is plugged into the pin of the motor position sensor (22). The housing (1) is provided with a motor power connector hole (44). One end of the motor power connector (17) is connected to the circuit board (18), and the other end is soldered to the busbar of the motor.

7. The integrated high-load axial electric drive device according to claim 1, characterized in that: The rotor shaft (4) is interference-fitted with the lead screw nut (13).

8. A method for installing the integrated high-load axial electric drive device according to any one of claims 5-6, characterized in that, Includes the following steps: The rotor shaft (4) is fixed to the lead screw nut (13), and the permanent magnet (3) and wave spring (20) are assembled onto the rotor shaft (4); one end of the wave spring (20) abuts against the second step (43); After the lead screw nut (13) passes through the end cover (11) and is fixed, the first outer ring (7), steel ball (14), adjusting shim (8) and second outer ring (9) are placed into the end cover (11) and fixed in sequence; The deep groove ball bearing (25) and the stator (2) are installed into the housing (1); Fix the end cap (11) to the housing (1), and place the rotor shaft (4) and the lead screw nut (13) into the housing (1), so that the deep groove ball bearing (25) abuts against the other end of the wave spring (20), and the stator (2) is located outside the permanent magnet (3).

9. The installation method of an integrated high-load axial electric drive device according to claim 8, characterized in that: The method for obtaining the adjusting shim (8) specifically includes the following steps: Obtain the span distance A of the first annular steel ball raceway (37); set the standard span distance as A0, and calculate the span distance difference △A between span distance A and standard span distance A0; Obtain the initial outer ring spacing B between the first outer ring (7) and the second outer ring (9); calculate the target thickness s based on the initial outer ring spacing B and the difference between the spans ΔA. Select the appropriate adjustment shim (8) according to the target thickness s.

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