Bearing dismounting assembly

Abstract

The utility model relates to the technical field of magnetic suspension motors, in particular to a bearing dismounting assembly. The bearing dismounting assembly comprises a plurality of stretching parts, the multiple stretching parts are arranged in the circumferential direction of a rotor at intervals, each stretching part comprises a stretching rod and an abutting part, the stretching rod is provided with a first end in the length direction of the stretching rod, and the abutting part is arranged at the first end and suitable for being inserted between two adjacent balls of a bearing; the abutting part protrudes out of the peripheral face of the stretching rod in the first direction, the abutting part is provided with a first side face and a second side face which are oppositely arranged in the axial direction of the stretching rod, the first side face is closer to the stretching rod than the second side face, and the two ends of the first side face are provided with a first abutting face and a second abutting face respectively; the first abutting face and the second abutting face abut against the two adjacent balls respectively, the first abutting face and the second abutting face are both constructed to be concave faces, and the first direction is perpendicular to the axial direction of the stretching rod. The purpose of simply, conveniently and quickly disassembling the bearing can be achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of magnetic suspension motors, in particular to a bearing dismounting assembly. BACKGROUND

[0002] The magnetic suspension motor has the advantages of high rotating speed, high power density, small size and energy saving and consumption reduction, and is increasingly applied in the industrial field. The magnetic suspension motor will be unstable due to interference or impact during operation, and the high-speed rotating rotor assembly will fall on the protection bearing, and the protection bearing needs to bear a high rotating speed for a short time.

[0003] Common bearings all have retainers to uniformly distribute the balls, so that the inner and outer rings of the bearing are uniformly stressed, thereby improving the service life of the bearing. However, the retainer will reduce the limit rotating speed of the bearing, so the protection bearing of the magnetic suspension motor generally adopts a protection bearing without a retainer.

[0004] The protection bearing of the magnetic suspension motor is a backup auxiliary support bearing, and the rotating speed borne by the protection bearing is generally high when the rotor is unstable. After several times of rotor instability, the protection bearing will fail due to high temperature or large stress, and needs to be replaced. CONTENT OF THE INVENTION

[0005] The application provides a bearing dismounting assembly, which can achieve the purpose of simple, convenient and rapid dismounting of the bearing.

[0006] In order to achieve the above purpose, the main technical scheme adopted by the application comprises:

[0007] The application provides a bearing dismounting assembly, which is used for a pump core assembly of a motor, the pump core assembly comprises a rotor and a bearing sleeved outside the rotor, the bearing dismounting assembly comprises a plurality of stretching parts, the plurality of stretching parts are arranged at intervals along the circumference of the rotor, each stretching part comprises a stretching rod and an abutting part, the stretching rod has a first end along the length direction of the stretching rod, and the abutting part is arranged at the first end and is adapted to be inserted between two adjacent balls of the bearing; wherein the abutting part protrudes from the outer circumferential surface of the stretching rod along a first direction, the abutting part has a first side surface and a second side surface arranged oppositely along the axial direction of the stretching rod, the first side surface is closer to the stretching rod than the second side surface, two ends of the first side surface are respectively provided with a first abutting surface and a second abutting surface along the first direction, the first abutting surface and the second abutting surface respectively abut against two adjacent balls, the first abutting surface and the second abutting surface are both configured as concave surfaces, and the first direction is perpendicular to the axial direction of the stretching rod.

[0008] The bearing dismounting assembly provided by the embodiment of the present application, the stretching part includes a stretching rod and an abutting part, the abutting part protrudes from the outer circumferential surface of the stretching rod, along the first direction, the first side surface of the abutting part includes a first abutting surface and a second abutting surface, both the first abutting surface and the second abutting surface are configured as concave surfaces to abut against two adjacent balls of the bearing, by pulling the stretching rod, the first abutting surface and the second abutting surface of the abutting part abut against the balls of the bearing, the bearing is moved, thereby dismounting the bearing, the whole dismounting process is simple and convenient, and the bearing can be quickly dismounted.

[0009] Optionally, along the first direction, the abutting part has oppositely arranged third and fourth side surfaces, the first abutting surface is connected to the third side surface, and the second abutting surface is connected to the fourth side surface. Both the first abutting surface and the second abutting surface are recessed towards the inside of the abutting part to form concave surfaces, so as to increase the contact area between the first abutting surface and the second abutting surface and the balls of the bearing, and the bearing can be more stably dismounted.

[0010] Optionally, the size of the abutting part along the first direction is greater than the size of the abutting part along the second direction, and the first direction, the second direction and the axial direction of the stretching rod are perpendicular to each other. The size of the abutting part along the first direction is greater than the size of the abutting part along the second direction, so as to increase the contact area between the first abutting surface and the second abutting surface and the balls along the axial direction of the stretching rod, so that the acting force is applied to the balls, and the bearing is more easily dismounted. The size of the abutting part along the second direction is smaller than the size of the abutting part along the first direction, that is, the size of the abutting part along the second direction is reduced, so that the abutting part can be deeply inserted below the balls from the gap between the two balls.

[0011] Optionally, both the first abutting surface and the second abutting surface are configured as arc surfaces. Both the first abutting surface and the second abutting surface are configured as arc surfaces, so as to better fit and contact the surface of the balls, thereby increasing the contact area between the first abutting surface and the second abutting surface and the balls, and the bearing is more easily dismounted.

[0012] Optionally, the number of the stretching parts is two, and the two stretching parts are oppositely arranged along the radial direction of the rotor. The two stretching parts are symmetrical along the axial direction of the rotor, when the bearing is dismounted, the two stretching parts are respectively arranged on the opposite sides of the bearing, the acting force is respectively applied to the two stretching parts, the opposite sides of the bearing are pulled at the same time, the stress of the bearing is uniform, and the bearing is more easily dismounted.

[0013] Optionally, the bearing dismounting assembly further includes a pulling mechanism, the stretching rod has a second end opposite to the first end, the pulling mechanism is connected to the second end, and the pulling mechanism is used for abutting against the shell of the motor or the rotor. The pulling mechanism abuts against the shell of the motor or the rotor, by applying the acting force to the pulling mechanism, the acting force is transmitted to the abutting part through the second end of the stretching rod, and the dismounting of the bearing is realized.

[0014] Optionally, the pulling mechanism comprises a pulling shaft, a mounting plate and a connecting rod, one end of the pulling shaft is arranged to abut against the rotor, the other end of the pulling shaft is threadedly connected with the mounting plate, one end of the connecting rod is fixed to the mounting plate, and the other end of the connecting rod is connected to the second end. By rotating the pulling shaft, the mounting plate moves relative to the pulling shaft. Since the pulling shaft abuts against the rotor, the pulling shaft remains stationary along the axial direction of the rotor, and the mounting plate moves upward relative to the rotor, thereby driving the stretching part to move upward, and further driving the bearing to move upward through the abutting part, so as to achieve the purpose of dismounting the bearing.

[0015] Optionally, the bearing dismounting assembly further comprises a pressing member, the pressing member is sleeved on the stretching rod, and the pressing member is arranged between the first end and the second end and is arranged to abut against the bearing.

[0016] Optionally, the position of the one end of the connecting rod on the mounting plate is adjustable. The position of the connecting rod on the mounting plate can be adjusted to adapt to bearings of different sizes, thereby achieving the dismounting of bearings of different sizes.

[0017] Optionally, an oblong hole is arranged on the mounting plate, the one end of the connecting rod passes through the oblong hole and is fixed to the mounting plate by a fastener. The oblong hole is arranged on the mounting plate, and the position of the connecting rod in the oblong hole is adjusted to adapt to bearings of different diameters. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0019] Figure 1 Fig. 1 is a structural schematic diagram of the stretching part of the bearing dismounting assembly of the present application;

[0020] Figure 2 Fig. 2 is a sectional view of the bearing dismounting assembly of the present application acting on the pump core assembly;

[0021] Figure 3 Fig. 3 is a structural schematic diagram of the bearing dismounting assembly of the present application acting on the pump core assembly.

[0022]

Explanation of reference signs

[0023] 1: pump core assembly; 11: rotor; 12: bearing; 121: ball;

[0024] 2: stretching portion; 21: stretching rod; 211: first end; 212: second end; 213: notch; 22: abutting portion; 221: first side surface; 222: second side surface; 223: third side surface; 224: fourth side surface; 225: first abutting surface; 226: second abutting surface;

[0025] 3: pulling mechanism; 31: pulling shaft; 311: main body portion; 312: first portion; 313: first plane; 32: mounting plate; 321: oblong hole; 33: connecting rod;

[0026] 4: housing;

[0027] 5: pressing member;

[0028] A: first direction; B: second direction; C: axial direction of the stretching rod. DETAILED DESCRIPTION

[0029] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application or the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0031] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0032] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] The term "and / or" in the present application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0034] The "multiple" appearing in the present application refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0035] At present, when the B-end protection bearing needs to be replaced, the entire rear bearing assembly needs to be disassembled, and then the bearing is disassembled separately by using a puller. After replacing the bearing, the bearing assembly is installed on the motor. When the A-end protection bearing needs to be replaced, the shaft assembly needs to be disassembled first, and then the A-end protection bearing is disassembled.

[0036] That is to say, at present, when the protection bearing needs to be replaced, the shaft assembly or the rear bearing assembly needs to be disassembled first, so that the disassembly work of the protection bearing can be carried out. The entire disassembly process is complex, time-consuming and laborious, and the control line is easily pressed or broken during the disassembly and replacement process. Therefore, a bearing disassembly tool is needed, which can directly disassemble the protection bearing without disassembling the shaft assembly or the rear bearing assembly.

[0037] In view of this, reference is made to Figure 1The embodiment of the present application provides a bearing dismounting assembly, which is used for a pump core assembly 1 of a motor, the pump core assembly 1 comprises a rotor 11 and a bearing 12 sleeved outside the rotor 11, the bearing dismounting assembly comprises a plurality of stretching parts 2, the plurality of stretching parts 2 are arranged at intervals along the circumference of the rotor 11, each stretching part 2 comprises a stretching rod 21 and an abutting part 22, along the length direction of the stretching rod 21, the stretching rod 21 has a first end 211, the abutting part 22 is arranged at the first end 211 and is suitable for being inserted between two adjacent rolling balls 121 of the bearing 12, wherein, along a first direction A, the abutting part 22 protrudes from the outer circumferential surface of the stretching rod 21, along the axial direction C of the stretching rod 21, the abutting part 22 has oppositely arranged first and second side faces 221 and 222, the first side face 221 is closer to the stretching rod 21 than the second side face 222, along the first direction A, the two ends of the first side face 221 are respectively provided with first and second abutting faces 225 and 226, the first and second abutting faces 225 and 226 respectively abut the two adjacent rolling balls 121, and the first and second abutting faces 225 and 226 are both configured as concave faces, and the first direction A is perpendicular to the axial direction C of the stretching rod 21.

[0038] The bearing dismounting assembly provided by the embodiment of the present application, the stretching part 2 comprises the stretching rod 21 and the abutting part 22, the abutting part 22 protrudes from the outer circumferential surface of the stretching rod 21, along the first direction A, the first side face 221 of the abutting part 22 comprises the first and second abutting faces 225 and 226, and the first and second abutting faces 225 and 226 are both configured as concave faces to abut the two adjacent rolling balls 121 of the bearing 12, by pulling the stretching rod 21, the first and second abutting faces 225 and 226 of the abutting part 22 abut the rolling balls 121 of the bearing 12, the bearing 12 is moved, and thus the bearing 12 is dismounted, the whole dismounting process is simple and convenient, and the bearing 12 can be quickly dismounted.

[0039] Specifically, along the axial direction C of the stretching rod 21, the abutting part 22 is arranged at the first end 211 of the stretching rod 21, along the first direction A, the abutting part 22 protrudes from the outer circumferential surface of the stretching rod 21, and along the first direction A, the two ends of the first side face 221 are provided with the first and second abutting faces 225 and 226, the first and second abutting faces 225 and 226 are both concave faces formed by being recessed inward toward themselves, and the contact area between the first and second abutting faces 225 and 226 and the rolling balls 121 of the bearing 12 is increased. When the bearing 12 needs to be dismounted, the abutting part 22 is inserted between the two adjacent rolling balls 121 inside the bearing 12, the first and second abutting faces 225 and 226 abut the two adjacent rolling balls 121 respectively, and force is applied to the stretching rod 21, so that the force is transmitted to the rolling balls 121 through the first and second abutting faces 225 and 226, and then the bearing 12 is pulled out.

[0040] It should be understood that the force can be applied to the stretching part 2 by means of a hydraulic rod or a puller, etc. in the present application to disassemble the bearing 12.

[0041] Optionally, the abutting part 22 has oppositely arranged third and fourth side faces 223 and 224 along the first direction A, and the first and second abutting faces 225 and 226 are connected to the third and fourth side faces 223 and 224, respectively. The abutting part 22 has oppositely arranged third and fourth side faces 223 and 224 along the first direction A, and the first and second abutting faces 225 and 226 are connected to one end of the first side face 221 and the third side face 223 and the other end of the first side face 221 and the fourth side face 224, respectively. The first and second abutting faces 225 and 226 are concave towards the inside of the abutting part 22 to form concave faces, so as to increase the contact area between the first and second abutting faces 225 and 226 and the balls 121 of the bearing 12, and the bearing 12 can be disassembled more stably.

[0042] Optionally, the abutting part 22 has a dimension along the first direction A greater than a dimension along the second direction B, and the first and second directions A and B are perpendicular to the axial direction C of the stretching rod 21. The abutting part 22 has the first and second abutting faces 225 and 226 along the first direction A to abut against the adjacent two balls 121, respectively, and the abutting part 22 has the dimension along the first direction A greater than the dimension along the second direction B, so as to increase the contact area between the first and second abutting faces 225 and 226 and the balls 121 along the axial direction of the stretching rod 21, so that the force can be applied to the balls 121, and the bearing 12 can be disassembled more easily. The dimension of the abutting part 22 along the second direction B is smaller than the dimension along the first direction A, that is, the dimension of the abutting part 22 along the second direction B is reduced, so that the abutting part 22 can be deepened from the gap between the two balls 121 to below the balls 121.

[0043] Specifically, the abutting part 22 is cut into a flat structure, and the abutting part 22 has the dimension along the first direction A greater than the dimension along the second direction B. The side face of the abutting part 22 along the second direction B is directed towards the adjacent two balls 121 and deepened into the inside of the bearing 12, and then the abutting part 22 is rotated by 90°, so that the first and second abutting faces 225 and 226 of the abutting part 22 along the first direction A are located below the two balls 121 and abut against the adjacent two balls 121, respectively. The force is applied to the stretching rod 21, so that the force is transmitted to the balls 121 through the first and second abutting faces 225 and 226, and the bearing 12 is pulled out.

[0044] Optionally, the first abutting surface 225 and the second abutting surface 226 are both configured as arc surfaces. The first abutting surface 225 and the second abutting surface 226 are both configured as arc surfaces to better match the surface of the ball 121, thereby increasing the contact area between the first abutting surface 225 and the second abutting surface 226 and the ball 121, and thus more easily disassembling the bearing 12.

[0045] Optionally, referring to Figure 2 and Figure 3 , the number of the stretching parts 2 is two, and the two stretching parts 2 are oppositely arranged along the radial direction of the rotor 11. The two stretching parts 2 are oppositely arranged along the radial direction of the rotor 11, that is, the two stretching parts 2 are symmetrical along the axial direction of the rotor 11. When disassembling the bearing 12, the two stretching parts 2 are respectively arranged on the opposite sides of the bearing 12, and the forces are respectively applied to the two stretching parts 2, and the opposite sides of the bearing 12 are pulled at the same time, so that the bearing 12 is uniformly stressed, thereby more easily disassembling the bearing 12.

[0046] Optionally, referring to Figure 2 and Figure 3 , the bearing 12 disassembling assembly further comprises a pulling mechanism 3, and the stretching rod 21 has a second end 212 opposite to the first end 211, and the pulling mechanism 3 is connected with the second end 212. The pulling mechanism 3 is used for abutting with the shell 4 or the rotor 11 of the motor. The pulling mechanism 3 abuts with the shell 4 or the rotor 11 of the motor, and by applying a force to the pulling mechanism 3, the force is transmitted to the abutting part 22 through the second end 212 of the stretching rod 21, thereby achieving the disassembly of the bearing 12.

[0047] Optionally, the pulling mechanism 3 comprises a pulling shaft 31, a mounting plate 32 and a connecting rod 33. One axial end of the pulling shaft 31 is used for abutting with the rotor 11, and the other axial end of the pulling shaft is threadedly matched with the mounting plate 32. One end of the connecting rod 33 is fixed to the mounting plate 32, and the other end of the connecting rod 33 is connected to the second end 212.

[0048] Specifically, the two stretching parts 2 are both fixed to the mounting plate 32 through the connecting rod 33, and the two stretching parts 2 are oppositely arranged relative to the pulling shaft 31. The mounting plate 32 is provided with an internally threaded hole in the middle, and the pulling shaft 31 passes through the internally threaded hole and is threadedly matched with the mounting plate 32, so as to press the pulling shaft 31 on the rotor 11 assembly. By rotating the pulling shaft 31, the mounting plate 32 and the pulling shaft 31 generate relative movement. Since the pulling shaft 31 abuts with the rotor 11, the pulling shaft 31 remains stationary along the axial direction of the rotor 11, and the mounting plate 32 moves upward relative to the rotor axial direction, thereby driving the stretching part 2 to move upward, and further driving the bearing 12 to move upward through the abutting part 22, so as to achieve the purpose of disassembling the bearing 12.

[0049] Optionally, the other end of the connecting rod 33 is threadedly matched with the second end 212. The other end of the connecting rod 33 is threadedly matched with the stretching rod 21 in a detachable manner.

[0050] Optionally, referring to Figure 2 and Figure 3 , the bearing 12 dismounting assembly further comprises a pressing member 5, the pressing member 5 is sleeved on the stretching rod 21, the pressing member 5 is arranged between the first end 211 and the second end 212, and is used for abutting against the bearing 12. When the abutting portion 22 penetrates into the bearing 12, the pressing member 5 abuts against the bearing 12, and the rotation of the stretching portion 2 is reduced. In addition, the second end 212 of the stretching rod 21 is cut out to form a notch 213, so as to facilitate fixing the stretching rod 21 and pressing the pressing member 5 on the bearing 12.

[0051] Optionally, referring to Figure 2 and Figure 3 , the position of one end of the connecting rod 33 on the mounting plate 32 is adjustable. The connecting rod 33 can be adjusted on the mounting plate 32 to adapt to bearings 12 of different sizes, so as to realize the dismounting of bearings 12 of different sizes.

[0052] Optionally, referring to Figure 2 and Figure 3 , the mounting plate 32 is provided with an oblong hole 321, and one end of the connecting rod 33 passes through the oblong hole 321 and is fixed to the mounting plate 32 by a fastener. The mounting plate 32 is provided with the oblong hole 321, and the position of the connecting rod 33 in the oblong hole 321 is adjusted to adapt to bearings 12 of different diameters. In one specific embodiment, the oblong hole 321 is a waist-shaped hole.

[0053] Specifically, on opposite sides of the pulling shaft 31, the mounting plate 32 is provided with a first waist-shaped hole and a second waist-shaped hole, and the two stretching portions 2 are connected to the mounting plate 32 by passing through the first waist-shaped hole and the second waist-shaped hole respectively. The length directions of the first waist-shaped hole and the second waist-shaped hole are in the same direction, and the first waist-shaped hole and the second waist-shaped hole extend away from each other.

[0054] One end of the connecting rod 33 is connected with a nut and abuts against and is fixed to the mounting plate 32 by passing through the oblong hole 321. The other end of the connecting rod 33 is threadedly connected with the second end 212 of the stretching rod 21. The section of the part between the one end and the other end of the connecting rod 33 is hexagonal. That is, in the axial direction of the stretching shaft, the projection structure of at least part of the connecting rod 33 is a regular hexagon. That is, the connecting rod 33 has a regular hexagonal surface, so as to facilitate the application of force by a wrench.

[0055] In one specific embodiment, the pulling shaft 31 comprises a connected main body part 311, a first part 312 abutting against the rotor 11, and a first flat surface 313, the first part 312 being connected between the main body part 311 and the first flat surface 313, the outer diameter of the first part 312 being smaller than that of the main body part 311, the first part 312 being configured as an arc-shaped part, and the first flat surface 312 abutting against the rotor 11. In the axial direction of the stretching part 2, the side of the main body part 311 away from the first part 312 has a regular hexagonal flat surface, so as to facilitate the application of torque by a wrench. That is, the pulling shaft 31 is provided with a ball head at one end, which is convenient for being pressed against the pin hole surface of the rotor 11, and the top end of the ball head is chamfered into a flat surface, which is convenient for being pressed against the rotor 11.

[0056] The bearing 12 dismounting assembly in the present application turns the abutting part 22 of the two stretching parts 2 by 90°, so that the first abutting surface 225 and the second abutting surface 226 of the abutting part 22 in the first direction A are located below the two adjacent rolling balls 121 and abut against the two adjacent rolling balls 121, respectively. The pressing part 5 abuts against the bearing 12, reducing the rotation of the stretching part 2. The stretching part 2 is fixed with the mounting plate through the connecting part, and the wrench is used to apply torque to the pulling shaft 31, so that the pulling shaft 31 presses the rotor 11, and the force applied to the pulling shaft 31 is applied to the stretching rod 21 through the mounting plate 32, so as to transmit the force to the rolling balls 121 through the first abutting surface 225 and the second abutting surface 226, and the mounting plate 32 moves upward relative to the pulling shaft 31, driving the stretching part 2 to move upward, and then the bearing 12 is pulled out, and the whole dismounting process is simple and convenient.

[0057] It should be noted that the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that processes, methods, articles, or devices that comprise a list of elements do not include only those elements, but also other elements not expressly listed, or other elements inherent to such processes, methods, articles, or devices. Without further limitation, an element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or device including the element.

[0058] Each of the embodiments in the present specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment mainly describes the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0059] The above merely provides an example of the present application, but is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

[0060] Although the embodiments of the present application are described with reference to the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes shall fall within the scope defined by the appended claims.

Claims

1. A bearing puller assembly for a pump core assembly of an electric machine, the pump core assembly comprising a rotor and a bearing disposed outside the rotor, characterized in that, The bearing dismounting assembly comprises: a plurality of stretching parts, the plurality of stretching parts are arranged at intervals along the circumference of the rotor, each of the stretching parts comprises a stretching rod and an abutting part, the stretching rod has a first end along the length direction of the stretching rod, and the abutting part is arranged at the first end and is adapted to be inserted between two adjacent rolling balls of the bearing; wherein, along a first direction, the abutting part protrudes from the outer circumferential surface of the stretching rod, along the axial direction of the stretching rod, the abutting part has oppositely arranged first and second side surfaces, the first side surface is closer to the stretching rod than the second side surface, along the first direction, the first side surface is provided with a first abutting surface and a second abutting surface at two ends respectively, the first and second abutting surfaces respectively abut the two adjacent rolling balls, and the first and second abutting surfaces are both configured as concave surfaces, and the first direction is perpendicular to the axial direction of the stretching rod.

2. The bearing puller assembly of claim 1, wherein, Along the first direction, the abutting part has oppositely arranged third and fourth side surfaces, the first abutting surface is connected to the third side surface, and the second abutting surface is connected to the fourth side surface.

3. Bearing puller assembly according to claim 1 or 2, characterized in that The size of the abutting part along the first direction is greater than the size of the abutting part along a second direction, and the first direction, the second direction and the axial direction of the stretching rod are perpendicular to each other.

4. The bearing puller assembly of claim 1, wherein, The first and second abutting surfaces are both configured as arc surfaces.

5. The bearing puller assembly of claim 1, wherein, The number of the stretching parts is two, and the two stretching parts are oppositely arranged along the radial direction of the rotor.

6. The bearing puller assembly of claim 1, wherein, The bearing dismounting assembly further comprises a pulling mechanism, the stretching rod has a second end opposite to the first end, the pulling mechanism is connected to the second end, and the pulling mechanism is used for abutting the housing of the motor or the rotor.

7. The bearing puller assembly of claim 6, wherein, The pulling mechanism comprises: a mounting plate; a pulling shaft, one axial end of the pulling shaft is used for abutting the rotor, and the other axial end of the pulling shaft is threadedly connected to the mounting plate; a connecting rod, one end of the connecting rod is fixed to the mounting plate, and the other end of the connecting rod is connected to the second end of the stretching rod.

8. The bearing puller assembly of claim 7, wherein, The bearing dismounting assembly further comprises a pressing member, the pressing member is sleeved on the stretching rod, and the pressing member is arranged between the first end and the second end and is used for abutting the bearing.

9. The bearing puller assembly of claim 7, wherein, The position of the one end of the connecting rod on the mounting plate is adjustable.

10. The bearing puller assembly of claim 9, wherein, The mounting plate is provided with an oblong hole, the one end of the connecting rod passes through the oblong hole, and the one end of the connecting rod is fixed to the mounting plate by a fastener.

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