A bearing assembly structure for an electric motor

Abstract

This utility model discloses a bearing assembly structure for an electric motor, relating to the field of motor design, including a stator and a mover. A positioning cylinder is formed in the middle of the stator, and a rotating shaft is fixedly installed in the middle of the mover. A limiting ring is formed inside the positioning cylinder, and rolling bearings are fitted on both the upper and lower sides of the positioning cylinder. The limiting ring is positioned between two rolling bearings, and the outer rings of the rolling bearings are fixedly installed inside the positioning cylinder. The rotating shaft is fixedly installed at the inner rings of the two rolling bearings. A first washer is abutted between the inner rings of the two rolling bearings and is sleeved on the rotating shaft. The thickness of the first washer is greater than or equal to the thickness of the limiting ring. In this utility model, the inner rings of the two rolling bearings are separated by the first washer. Even if the inner rings of the rolling bearings are completely locked on the rotating shaft, it will not affect the outer rings of the rolling bearings. Therefore, the rolling bearings will not be jammed, and no play noise will be generated, ensuring the stable operation of the brushless motor.

Description

Technical Field

[0001] This utility model relates to the field of motor design, and in particular to a bearing assembly structure for a motor. Background Technology

[0002] A brushless DC motor consists of a motor body and a driver, and is a typical mechatronic product. Because a brushless DC motor operates in a self-controlled manner, it does not require an additional starting winding on the rotor like a synchronous motor that starts under heavy load with frequency conversion speed regulation, nor does it experience oscillation or loss of synchronism during sudden load changes.

[0003] Among the brushless motors on the market, such as Figure 4 As shown, the rotating shaft 4 of the mover 2 generally adopts a cantilever beam structure. It is installed in the middle of the stator 1 through the rotational engagement of the rolling bearing 6 and locked by the fastening nut 9. When the fastening nut 9 is locked, it presses down on the inner ring of the lower rolling bearing 6, while the outer ring of the rolling bearing 6 is fixed in the stator 1. The rolling bearing 6 is in a state where the outer ring is fixed and the inner ring is suspended. In order to eliminate the play noise when the brushless motor is running, it is generally necessary to achieve this by pre-tightening the rolling bearing 6. In the above structure, if the pre-tightening force is too small, play noise will be generated. If the pre-tightening force is too large, the rolling bearing 6 will be jammed, causing it to be unable to operate normally.

[0004] Therefore, it is necessary to design a bearing assembly structure suitable for brushless motors to solve the technical problem of difficulty in adjusting the preload in the above scheme. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model provides a technical solution that can solve the above problems.

[0006] A bearing assembly structure for an electric motor includes a stator and a mover; a positioning cylinder is formed in the middle of the stator, and a rotating shaft is fixedly installed in the middle of the mover, with the rotating shaft rotatably fitted into the positioning cylinder; The positioning cylinder is formed with a limiting ring. Rolling bearings are installed on both the upper and lower sides of the positioning cylinder. The limiting ring is set between two rolling bearings. The outer ring of the rolling bearing is fixedly installed in the positioning cylinder, and the rotating shaft is fixedly installed at the inner ring of the two rolling bearings. A first washer is abutted between the inner rings of the two rolling bearings. The first washer is sleeved on the rotating shaft, and the thickness of the first washer is greater than or equal to the thickness of the limiting ring.

[0007] Furthermore: the outer side of the lower end of the shaft is formed with an external thread, and a fastening nut is screwed onto the external thread. A second washer is installed between the inner ring of the lower rolling bearing and the fastening nut, and the second washer is sleeved on the shaft.

[0008] Furthermore, the bottom end of the positioning cylinder is formed with a countersunk groove, and the fastening nut is fitted into the countersunk groove with clearance fit.

[0009] Furthermore: a positioning seat is fixedly installed between the middle part of the mover and the rotating shaft. The outer side of the lower end of the positioning seat is formed with a tapered surface that is wider at the top and narrower at the bottom. The lower edge of the tapered surface abuts against the inner ring of the upper rolling bearing.

[0010] Furthermore: a copper wire winding is fixedly installed on the stator, the copper wire winding is located outside the positioning cylinder, and a permanent magnet ring is fixedly installed inside the mover, with the copper wire winding installed in a clearance fit inside the permanent magnet ring.

[0011] Furthermore: There are two first gaskets, which are stacked on top of each other.

[0012] Furthermore: the first gasket is made of either a rubber washer or a spring washer.

[0013] Furthermore: the thickness of the first gasket before pressing is greater than the thickness of the limiting ring, and the thickness of the first gasket after pressing is equal to the thickness of the limiting ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: the rotating shaft is installed in the positioning cylinder by the cooperation of rolling bearings on the upper and lower sides. The outer rings of the two rolling bearings are separated by a limiting ring, and the inner rings of the two rolling bearings are separated by a first washer, so as to achieve stable installation of the rolling bearings. Even if the inner ring of the rolling bearing is completely locked on the rotating shaft, it will not affect the outer ring of the rolling bearing, so the rolling bearing will not be stuck. After locking the inner ring of the rolling bearing, no play noise will be generated, thus ensuring the stable operation of the brushless motor.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a half-sectional structural diagram of the present invention; Figure 3 yes Figure 2 A magnified structural diagram at point A; Figure 4 This is a schematic diagram of the installation structure of the rolling bearing in a brushless motor in the prior art.

[0018] The following components are shown in the figure: 1. Stator; 2. Mover; 3. Positioning cylinder; 4. Rotating shaft; 5. Limiting ring; 6. Rolling bearing; 7. First washer; 8. External thread; 9. Fastening nut; 10. Second washer; 11. Countersunk groove; 12. Positioning seat; 13. Conical surface; 14. Copper wire winding; 15. Permanent magnet ring. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0020] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0021] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] like Figure 1-3As shown, the present invention provides a bearing assembly structure for an electric motor, comprising a stator 1 and a mover 2; a positioning cylinder 3 is formed in the middle of the stator 1, and a rotating shaft 4 is fixedly installed in the middle of the mover 2, the rotating shaft 4 being rotatably fitted into the positioning cylinder 3; The positioning cylinder 3 is formed with a limiting ring 5. Rolling bearings 6 are installed on both the upper and lower sides of the positioning cylinder 3. The limiting ring 5 is set between the two rolling bearings 6. The outer ring of the rolling bearing 6 is fixedly installed in the positioning cylinder 3. The rotating shaft 4 is fixedly installed at the inner ring of the two rolling bearings 6. A first washer 7 is abutted between the inner rings of the two rolling bearings 6. The first washer 7 is sleeved on the rotating shaft 4. The thickness of the first washer 7 is greater than or equal to the thickness of the limiting ring 5. The principle is as follows: the rotating shaft 4 is installed in the positioning cylinder 3 through the cooperation of the upper and lower rolling bearings 6. The outer rings of the two rolling bearings 6 are separated by the limiting ring 5, and the inner rings of the two rolling bearings 6 are separated by the first washer 7, so as to achieve stable installation of the rolling bearings 6. Even if the inner ring of the rolling bearing 6 is completely locked on the rotating shaft 4, it will not affect the outer ring of the rolling bearing 6, so the rolling bearing 6 will not be stuck. After locking the inner ring of the rolling bearing 6, no play noise will be generated, thus ensuring the stable operation of the brushless motor.

[0025] Furthermore: the outer side of the lower end of the rotating shaft 4 is formed with an external thread 8, and a fastening nut 9 is screwed onto the external thread 8. A second washer 10 is installed between the inner ring of the lower rolling bearing 6 and the fastening nut 9. The second washer 10 is sleeved on the rotating shaft 4. The rotating shaft 4 can be assembled by locking the rolling bearing 6 by screwing on the fastening nut 9. When the fastening nut 9 is completely locked, the inner rings of the two rolling bearings 6 will press against each other because there is a first washer 7 between the two rolling bearings 6. At this time, the rolling bearings 6 will not be stuck, thus ensuring the stable operation of the brushless motor while achieving stable assembly. This invention uses a fastening nut 9 to lock the inner ring of the rolling bearing 6, thereby locking the inner ring of the rolling bearing 6 onto the rotating shaft 4. At this time, the outer ring of the rolling bearing 6 is not affected, so the rolling bearing 6 will not be jammed. At the same time, the fastening nut 9 will not produce any play noise after being tightened, thus ensuring the stable operation of the brushless motor.

[0026] Furthermore, the bottom end of the positioning cylinder 3 is formed with a countersunk groove 11, and the fastening nut 9 is fitted into the countersunk groove 11 with clearance fit; this allows the fastening nut 9 to be hidden in the countersunk groove 11, which can effectively reduce the overall thickness of the brushless motor, improve the structural compactness of the brushless motor, and realize the miniaturized brushless motor design.

[0027] Furthermore: a positioning seat 12 is fixedly installed between the middle part of the mover 2 and the rotating shaft 4. The outer side of the lower end of the positioning seat 12 is formed with a tapered surface 13 that is wider at the top and narrower at the bottom. The lower edge of the tapered surface 13 abuts against the inner ring of the upper rolling bearing 6. When the fastening nut 9 is tightened, the inner ring of the upper rolling bearing 6 will press against the bottom side of the tapered surface 13 of the positioning seat 12 for locking. Since the fastening nut 9 only locks the inner ring of the rolling bearing 6, the first washer 7 and the second washer 10 when it is tightened, it will not affect the rotation of the outer ring of the bearing, thus ensuring the stable operation of the brushless motor.

[0028] Furthermore: a copper wire winding 14 is fixedly installed on the stator 1, the copper wire winding 14 is located on the outside of the positioning cylinder 3, and a permanent magnet ring 15 is fixedly installed on the inside of the mover 2. The copper wire winding 14 is installed in the permanent magnet ring 15 with a clearance fit. When the copper wire winding 14 is energized, it generates a magnetic field, which matches the magnetic field of the permanent magnet ring 15, thereby driving the entire mover 2 to rotate. At this time, the rotating shaft 4 will rotate in the positioning cylinder 3 through the rolling bearings 6 on the upper and lower sides. Since the rolling bearings 6 will not be jammed when the fastening nut 9 is locked, the stable operation of the brushless motor can be ensured.

[0029] Furthermore: There are two first gaskets 7, which are stacked on top of each other; the thickness of the limiting ring 5 can be adapted by stacking the first gaskets 7 to ensure the stable assembly of the rolling bearing 6.

[0030] Furthermore: the first gasket 7 is made of either a rubber washer or a spring washer; it has a certain elastic stress, which can effectively prevent the rolling bearing 6 from seizing when locked.

[0031] Furthermore: the thickness of the first gasket 7 before pressing is greater than the thickness of the limiting ring 5, and the thickness of the first gasket 7 after pressing is equal to the thickness of the limiting ring 5; thus achieving stable assembly of the rolling bearing 6.

[0032] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A bearing assembly structure for an electric motor, comprising a stator and a mover; characterized in that: A positioning cylinder is formed in the middle of the stator, and a rotating shaft is fixedly installed in the middle of the mover; The positioning cylinder is formed with a limiting ring. Rolling bearings are installed on both the upper and lower sides of the positioning cylinder. The limiting ring is set between two rolling bearings. The outer ring of the rolling bearing is fixedly installed in the positioning cylinder, and the rotating shaft is fixedly installed at the inner ring of the two rolling bearings. A first washer is abutted between the inner rings of the two rolling bearings. The first washer is sleeved on the rotating shaft, and the thickness of the first washer is greater than or equal to the thickness of the limiting ring.

2. The bearing assembly structure for an electric motor according to claim 1, characterized in that: The outer side of the lower end of the shaft is formed with an external thread, and a fastening nut is installed on the external thread in a spiral fit. A second washer is installed between the inner ring of the lower rolling bearing and the fastening nut, and the second washer is sleeved on the shaft.

3. The bearing assembly structure for an electric motor according to claim 2, characterized in that: The bottom of the positioning cylinder is formed with a countersunk groove, and the fastening nut is installed in the countersunk groove with clearance fit.

4. The bearing assembly structure for an electric motor according to claim 1, characterized in that: A positioning seat is fixedly installed between the middle part of the mover and the rotating shaft. The outer side of the lower end of the positioning seat is formed with a tapered surface that is wider at the top and narrower at the bottom. The lower edge of the tapered surface abuts against the inner ring of the upper rolling bearing.

5. The bearing assembly structure for an electric motor according to claim 1, characterized in that: A copper wire winding is fixedly installed on the stator, and the copper wire winding is located outside the positioning cylinder. A permanent magnet ring is fixedly installed on the inside of the mover, and the copper wire winding is installed in the permanent magnet ring with a clearance fit.

6. The bearing assembly structure for an electric motor according to claim 1, characterized in that: There are two first gaskets, which are stacked on top of each other.

7. The bearing assembly structure for an electric motor according to claim 1, characterized in that: The first gasket is either a rubber washer or a spring washer.

8. The bearing assembly structure for an electric motor according to claim 7, characterized in that: The thickness of the first gasket before pressing is greater than the thickness of the limiting ring, and the thickness of the first gasket after pressing is equal to the thickness of the limiting ring.

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