High-torque strong-output three-phase asynchronous motor

Abstract

The utility model provides a high torque strong output three-phase asynchronous motor, which comprises a motor casing and a front end cover, a stator and a rotor shaft are arranged in the motor casing, the front end cover is provided with a via hole I for the rotor shaft to pass through, the front end cover is fixed with the motor casing through a screw, the rear end of the via hole is also provided with a counter bore, a tapered roller bearing is arranged in the counter bore, and the tapered roller bearing is arranged in the front end cover. The front end cover is further provided with a pressing shaft assembly used for stabilizing the rotor shaft, the pressing shaft assembly comprises a mounting base and a plurality of positioning balls, a second through hole allowing the rotor shaft to penetrate through is formed in the mounting base, a ball ring groove is formed in the rotor shaft, and the positioning balls are arranged between the ball ring groove and the mounting base. The tapered roller bearing is arranged between the front end cover and the rotor shaft, rigid connection between the front end cover and the motor shell is kept, so that the connection rigidity is improved, the positioning balls are matched with the ball ring grooves, the rotor shaft is pressed by the positioning balls, and the limiting point positions of the rotor shaft are increased.

Description

Technical Field

[0001] The utility model relates to a motor, in particular to a three-phase asynchronous motor with high torque and strong output. Background Art

[0002] The three-phase asynchronous motor is an induction motor that is powered by a 380V three-phase AC current. The three-phase asynchronous motor has the characteristics of simple structure, reliable operation, large torque, strong load adaptability, and high efficiency. At the same time, the maintenance cost of the three-phase asynchronous motor is relatively low, so it has been widely used.

[0003] At present, a Chinese patent with announcement number CN215498546U discloses a high-strength motor with a vibration-resistant output shaft, including a motor body, a motor shaft connected to one side of the motor body, a fixing ring sleeved on the outer surface of the motor shaft, the outer end of the fixing ring is fixed to the motor body, a shock-absorbing ring is arranged inside the fixing ring, a bearing is arranged inside the shock-absorbing ring, a first shock-absorbing mechanism is also arranged between the shock-absorbing ring and the inner wall of the fixing ring, the first shock-absorbing mechanism includes a first reinforcing plate and a second reinforcing plate, and a rubber plate is arranged between the first reinforcing plate and the second reinforcing plate through an adhesive.

[0004] The above patent still has shortcomings. When the output torque requirement of the motor is high, the stability of the motor's output shaft is also required to be high. It is usually necessary to ensure that the motor output shaft does not produce a large amount of shaking during rotation. The above motor can only reduce the impact of external vibration on the motor output shaft by increasing the seismic performance through the rubber plate. The shaking of the motor output shaft itself due to the high torque cannot be eliminated by the rubber plate. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a high-torque and high-output three-phase asynchronous motor, which has the advantage of high motor shaft stability.

[0006] In order to solve the above technical problems, the technical solution of the utility model is: a high-torque and high-output three-phase asynchronous motor, comprising a motor housing and a front end cover, the motor housing is provided with a stator and a rotor shaft, the front end cover is provided with a through hole one for the rotor shaft to pass through, the front end cover is fixed to the motor housing by screws, a countersunk hole is also provided at the rear end of the through hole, a tapered roller bearing is provided in the countersunk hole, a pressure shaft assembly for stabilizing the rotor shaft is also provided on the front end cover, the pressure shaft assembly comprises a mounting base and a plurality of positioning balls, a through hole two is provided in the mounting base for the rotor shaft to pass through, the positioning balls are arranged in a ring array in the through hole two, a ball ring groove is provided on the rotor shaft, and the positioning balls are arranged between the ball ring groove and the mounting base.

[0007] Through the above-mentioned technical means, by arranging the tapered roller bearing between the front end cover and the rotor shaft and maintaining the rigid connection between the front end cover and the motor housing, the connection stiffness is increased, and by selecting the tapered roller bearing, the connection rigidity and seismic resistance of the rotor shaft and the front end cover are further increased, and the damage to the bearing is reduced. By arranging the shaft pressing assembly and cooperating the locating balls with the ball ring grooves, the locating balls press the rotor shaft, thereby increasing the limiting points of the rotor shaft, further increasing the rotation stability of the rotor shaft, and making the motor suitable for high-torque working environments.

[0008] Preferably, a positioning ring groove is provided on the front end cover, a positioning ring is provided on the mounting base, the positioning ring is matched with the positioning ring groove, and the front end cover and the mounting base are fixed by screws.

[0009] By means of the above technical means, the installation accuracy between the front end cover and the mounting base is increased through the cooperation between the positioning ring groove and the positioning ring, thereby improving the cooperation accuracy between the positioning ball and the rotor shaft.

[0010] Preferably, the outer side of the mounting base is hexagonal, and a mounting groove is provided on the mounting base. A ball seat is provided in the mounting groove. The ball seat is fixed to the mounting base by screws, and the positioning ball is provided in the ball seat.

[0011] Through the above technical means, by arranging the positioning ball in the ball seat and fixing the ball seat to the mounting base through screws, the installation of the positioning ball during assembly is facilitated.

[0012] Preferably, a support hole is further provided in the ball seat, the positioning ball is arranged in the support hole, a support head and a pressure head are also provided in the support hole, the bottom of the support head supports the positioning ball, the pressure head is threadedly connected to the support hole, and a spring is provided between the support head and the pressure head.

[0013] Through the above technical means, through the threaded connection between the pressure head and the abutment hole, and the spring pressing the abutment to make it abut against the positioning ball, the positioning ball is fixed and the positioning ball preload is adjusted, so that the rotation stability of the rotor shaft is improved.

[0014] Preferably, a grease storage groove is provided on one side of the abutment head that is in close contact with the positioning ball, and the grease storage groove is used to place grease and lubricate the positioning ball.

[0015] Through the above technical means, by providing a grease storage groove and placing grease in the grease storage groove, the friction between the positioning ball and the ball ring groove is reduced, thereby slowing down the wear of the positioning ball.

[0016] Preferably, the outer side of the front end cover is provided with first ribs in a circular array, and the inner side of the front end cover is provided with second ribs.

[0017] Through the above technical means, the structural strength and rigidity of the interior and exterior of the front end cover are increased by the first rib plate and the second rib plate, thereby reducing the possibility of deformation of the front end cover.

[0018] Preferably, the tapered roller bearing comprises a bearing inner ring, a bearing outer ring and a tapered roller, the bearing inner ring is provided with a connecting sleeve, a fixing hole 1 is formed on the connecting sleeve, a threaded hole 1 is formed on the rotor shaft, the connecting sleeve is fixed to the rotor shaft by screws, the bearing outer ring is provided with a connecting ring, a fixing hole 2 is formed on the connecting ring, and the connecting ring is fixed to the front end cover by screws.

[0019] Through the above technical means, the tapered roller bearing is fixed to the front end cover and the rotor shaft by a screw, which facilitates the disassembly of the bearing, thereby facilitating the replacement of the bearing when the tapered roller is worn.

[0020] Preferably, the tapered roller bearing comprises a bearing inner ring, a bearing outer ring and a tapered roller, the bearing inner ring is provided with a connecting sleeve, a fixing hole is provided on the connecting sleeve, a threaded hole is provided on the rotor shaft, the connecting sleeve is fixed to the rotor shaft by screws, the bearing outer ring is provided with a connecting ring, a locking groove is provided on the connecting ring, a positioning locking block is provided at the rear end of the front end cover, and the positioning locking block is stuck in the locking groove.

[0021] Through the above technical means, the circumferential rotation between the bearing outer ring and the front end cover is limited by the locking groove and the positioning locking block, and the axial movement of the tapered roller bearing is limited by the connecting sleeve, which further facilitates the disassembly of the bearing.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. The connection stability is increased by selecting tapered roller bearings, while the deformation caused by the temperature rise during friction is reduced. By matching the positioning balls with the ball ring grooves, the limiting points of the rotor shaft are increased, further increasing the stability of the rotor shaft;

[0024] 2. By cooperating the butt head with the butt hole and rotating the butt head against the positioning ball, the pressing force of the positioning ball on the rotor shaft is adjusted. By opening a grease storage groove, the friction of the positioning ball is reduced to prevent the positioning ball from wearing too fast.

[0025] 3. By fixing the inner ring of the bearing on the rotor shaft, it is convenient to disassemble and replace the tapered roller bearing when the tapered roller is worn. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of embodiment 1;

[0027] Figure 2 The structure of the front cover is shown in Figure 1. Figure 1 ;

[0028] Figure 3 The structure of the front cover is shown in Figure 1. Figure 2 ;

[0029] Figure 4 is a cross-sectional schematic diagram of embodiment 1;

[0030] Figure 5 It is a partial cross-sectional view of the first embodiment;

[0031] Figure 6 for Figure 5 Schematic diagram of part A;

[0032] Figure 7 It is a structural diagram of embodiment 2.

[0033] 1. Motor housing; 2. Front end cover; 3. Stator; 4. Rotor shaft; 5. Through hole 1; 6. Countersunk hole; 7. Tapered roller bearing; 8. Bearing inner ring; 9. Bearing outer ring; 10. Tapered roller; 11. Connecting sleeve; 12. Fixing hole 1; 13. Threaded hole 1; 14. Connecting ring; 15. Fixing hole 2; 16. Shaft pressing assembly; 17. Mounting base; 18. Positioning ball; 19. Through hole 2; 20. Ball ring groove; 21. Positioning ring groove; 22. Positioning ring; 23. Mounting groove; 24. Ball seat; 25. Butt hole; 26. Butt head; 27. Press head; 28. Spring; 29. ​​Grease storage tank; 30. First rib; 31. Second rib; 32. Lock groove; 33. Positioning lock block. DETAILED DESCRIPTION

[0034] The specific implementation modes of the present invention are further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp. Embodiment 1:

[0035] A high torque and high output three-phase asynchronous motor, such as Figure 1-Figure 5As shown, it includes a motor housing 1 and a front end cover 2. A stator 3 and a rotor shaft 4 are arranged in the motor housing 1. A through hole 5 is opened on the front end cover 2 for the rotor shaft 4 to pass through. The front end cover 2 is fixed to the motor housing 1 by screws, and an elastic gasket is sleeved on the screw to prevent loosening. A countersunk hole 6 is also opened at the rear end of the through hole. A tapered roller bearing 7 is arranged in the countersunk hole 6. By selecting the tapered roller bearing 7, the connection rigidity and anti-seismic ability of the rotor shaft 4 and the front end cover 2 are further increased, and the damage of the bearing is reduced. The tapered roller bearing 7 includes a bearing inner ring 8, a bearing outer ring 9 and a tapered roller 10. The tapered roller 10 is arranged between the bearing outer ring 9 and the bearing inner ring 8. A connecting sleeve 11 is provided on the side end face of the bearing inner ring 8, a plurality of planes are provided on the outer side of the connecting sleeve 11, a fixing hole 12 is provided on the plane, a threaded hole 13 is provided on the rotor shaft 4, the connecting sleeve 11 is fixed to the rotor shaft 4 by screws, a connecting ring 14 is provided on the bearing outer ring 9, a fixing hole 15 is provided on the connecting ring 14, the connecting ring 14 is fixed to the front end cover 2 by screws, and the tapered roller bearing 7 is fixed by the screws, so that the tapered roller bearing 7 does not need to be tightly matched with the front end cover 2 and the rotor shaft 4. When the tapered roller 10 is worn, the tapered roller bearing 7 can be replaced by removing the screws, which is more convenient.

[0036] A pressure shaft assembly 16 for stabilizing the rotor shaft 4 is also provided on the front end cover 2. The pressure shaft assembly 16 includes a mounting base 17 and twelve positioning balls 18. A second through hole 19 is provided in the mounting base 17 for the rotor shaft 4 to pass through. The positioning balls 18 are arranged in a circular array in the second through hole 19. Two ball ring grooves 20 are provided on the rotor shaft 4. The positioning balls 18 are arranged between the ball ring grooves 20 and the mounting base 17. Six balls are arranged in each ball ring groove 20, thereby increasing the limiting points of the rotor shaft 4 and further increasing the rotation stability of the rotor shaft 4.

[0037] A positioning ring groove 21 is provided on the front end cover 2, and a positioning ring 22 is provided on the mounting base 17. The positioning ring 22 and the positioning ring groove 21 are clearance-matched. The front end cover 2 and the mounting base 17 are fixed by screws. When the selected length of the rotor shaft 4 is shorter, the shorter pressing shaft assembly 16 can be removed or replaced to ensure the applicability of the motor. The outer side of the mounting base 17 is hexagonal, and six mounting grooves 23 are provided in a circular array on the mounting base 17. A ball seat 24 is provided in the mounting groove 23. The ball seat 24 is fixed to the mounting base 17 by screws, and two positioning balls 18 are provided in the ball seat 24.

[0038] like Figure 6As shown, a pair of abutting holes 25 are also provided in the ball seat 24, and the positioning ball 18 is arranged in the abutting holes 25. Abutting head 26 and a pressing head 27 are also provided in the abutting hole 25. The bottom of the abutting head 26 abuts against the positioning ball 18, and the pressing head 27 is threadedly connected to the abutting hole 25. A spring 28 is provided between the abutting head 26 and the pressing head 27. Both ends of the spring 28 are welded to the abutting head 26 and the pressing head 27. When installing the positioning ball 18, first install the ball seat 24 on the mounting base 17, then remove the pressing head 27 and the abutting head 26 and put the positioning ball 18 into the abutting hole 25, and finally put the abutting head 26 back into the abutting hole 25, then screw on the pressing head 27 again and make the abutting head 26 The head 26 can be pressed against the positioning ball 18. At this time, it is necessary to adjust the pressure of the head 26 against the positioning ball 18. At the same time, the reaction force of the spring 28 ensures that the pressure head 27 will not rotate due to vibration, thereby reducing the pressing force. While ensuring the rotational movement of the positioning ball 18 and the ball ring groove 20, the vibration amplitude of the rotor shaft 4 is minimized. A grease storage groove 29 is also provided on the side of the head 26 that is close to the positioning ball 18. The grease storage groove 29 is used to place grease and lubricate the positioning ball 18. When grease needs to be filled, the head 26 can be removed and grease can be added to the grease storage groove 29. The grease can slow down the wear of the positioning ball 18.

[0039] like Figure 2 , Figure 3 As shown, a first rib 30 is arranged in a circular array on the outside of the front end cover 2, and a second rib 31 is arranged on the inside of the front end cover 2. The first rib 30 and the second rib 31 increase the structural strength and rigidity of the inside and outside of the front end cover 2 and reduce the possibility of deformation of the front end cover 2. Embodiment 2:

[0040] The difference between the second embodiment and the first embodiment is that the tapered roller bearing 7 includes a bearing inner ring 8, a bearing outer ring 9 and a tapered roller 10, the bearing inner ring 8 is provided with a connecting sleeve 11, a fixing hole 12 is provided on the connecting sleeve 11, a threaded hole 13 is provided on the rotor shaft 4, the connecting sleeve 11 is fixed to the rotor shaft 4 by screws, the bearing outer ring 9 is provided with a connecting ring 14, a locking groove 32 is provided on the connecting ring 14, a positioning locking block 33 is provided at the rear end of the front end cover 2, the positioning locking block 33 is inserted into the locking groove 32, the circumferential rotation between the bearing outer ring 9 and the front end cover 2 is limited by the locking groove 32 and the positioning locking block 33, the axial movement of the tapered roller bearing 7 is limited by the connecting sleeve 11, and the disassembly of the bearing is further facilitated.

[0041] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A three-phase asynchronous motor with high torque and high output, comprising a motor housing (1) and a front end cover (2), wherein a stator (3) and a rotor shaft (4) are arranged in the motor housing (1), and the front end cover (2) is provided with a through hole (5) for the rotor shaft (4) to pass through, wherein: The front end cover (2) is fixed to the motor housing (1) by screws. A countersunk hole (6) is provided at the rear end of the through hole. A tapered roller bearing (7) is arranged in the countersunk hole (6). A pressure shaft assembly (16) for stabilizing the rotor shaft (4) is also provided on the front end cover (2). The pressure shaft assembly (16) includes a mounting base (17) and a plurality of positioning balls (18). A second through hole (19) for the rotor shaft (4) to pass through is provided in the mounting base (17). The positioning balls (18) are arranged in a circular array in the second through hole (19). A ball ring groove (20) is provided on the rotor shaft (4). The positioning balls (18) are arranged between the ball ring groove (20) and the mounting base (17).

2. A high torque and high output three-phase asynchronous motor according to claim 1, characterized in that: The front end cover (2) is provided with a positioning ring groove (21), the mounting base (17) is provided with a positioning ring (22), the positioning ring (22) is adapted to the positioning ring groove (21), and the front end cover (2) and the mounting base (17) are fixed by screws.

3. A high torque and high output three-phase asynchronous motor according to claim 1, characterized in that: The outer side of the mounting base (17) is hexagonal, and the mounting base (17) is also provided with a mounting groove (23). A ball seat (24) is arranged in the mounting groove (23). The ball seat (24) is fixed to the mounting base (17) by screws, and the positioning ball (18) is arranged in the ball seat (24).

4. A high torque and high output three-phase asynchronous motor according to claim 3, characterized in that: The ball seat (24) is also provided with abutment hole (25), the positioning ball (18) is arranged in thebutment hole (25), abutment head (26) and a pressure head (27) are also provided in thebutment hole (25), the bottom of thebutment head (26) is against the positioning ball (18), the pressure head (27) is threadedly connected to thebutment hole (25), and a spring (28) is provided between thebutment head (26) and the pressure head (27).

5. A high torque and high output three-phase asynchronous motor according to claim 4, characterized in that: A grease storage groove (29) is also provided on one side of the abutment head (26) that is in close contact with the positioning ball (18). The grease storage groove (29) is used to store lubricating grease and lubricate the positioning ball (18).

6. The high-torque, high-output three-phase asynchronous motor according to claim 1 is characterized in that: The front end cover (2) is also provided with first ribs (30) in an annular array on the outside, and the front end cover (2) is also provided with second ribs (31) on the inside.

7. The high-torque, high-output three-phase asynchronous motor according to claim 1 is characterized in that: The tapered roller bearing (7) comprises a bearing inner ring (8), a bearing outer ring (9) and a tapered roller. The bearing inner ring (8) is provided with a connecting sleeve (11). A fixing hole (12) is provided on the connecting sleeve (11). A threaded hole (13) is provided on the rotor shaft (4). The connecting sleeve (11) is fixed to the rotor shaft (4) by screws. The bearing outer ring (9) is provided with a connecting ring (14). A fixing hole (15) is provided on the connecting ring (14). The connecting ring (14) is fixed to the front end cover (2) by screws.

8. The high-torque, high-output three-phase asynchronous motor according to claim 1 is characterized in that: The tapered roller bearing (7) comprises a bearing inner ring (8), a bearing outer ring (9) and a tapered roller. The bearing inner ring (8) is provided with a connecting sleeve (11), a fixing hole (12) is provided on the connecting sleeve (11), a threaded hole (13) is provided on the rotor shaft (4), the connecting sleeve (11) is fixed to the rotor shaft (4) by screws, the bearing outer ring (9) is provided with a connecting ring (14), a locking groove (32) is provided on the connecting ring (14), and a positioning locking block (33) is provided at the rear end of the front end cover (2), and the positioning locking block (33) is inserted into the locking groove (32).

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