A brushless motor with oil-impregnated bearings

Abstract

The utility model discloses a kind of brushless motor with oil bearing, it is related to motor design field, including base, drive plate, stator assembly and rotor assembly;The middle part of the base is formed with positioning cylinder;The rotor assembly includes rotating cover and rotating shaft, and oil bearing is cooperatively installed between positioning cylinder and rotating shaft;The outside of the upper end of oil bearing is formed with thin shaft, and positioning cylinder and thin shaft form oil storage groove structure between, and the outside of oil bearing is formed with several vertical grooves, and the upper end of vertical groove is connected into oil storage groove structure;The utility model utilizes the structural design of oil bearing, let lubricating oil store in oil storage groove, when brushless motor is running, lubricating oil will be evenly distributed to oil bearing and positioning cylinder between along the vertical groove around oil bearing, realize sufficient lubrication, replace the installation mode of traditional double-ball bearing by single oil bearing, realize effective noise reduction, can avoid the defect of double-ball bearing concentricity difference, guarantee production quality, reduce manufacturing cost.

Description

Technical Field

[0001] This utility model relates to the field of motor design, and in particular to a brushless motor with an oil-impregnated bearing. 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] The following defects are commonly found in current brushless motors: 1. The existing brushless motor shafts are generally assembled using a double ball bearing assembly method. The concentricity of the two ball bearings during assembly is poor, and the ball bearings are noisy when working. As a result, the production yield of brushless motors is not high, and the cost of ball bearings is high, which increases the production cost of brushless motors. 2. The installation method of double ball bearings requires the setting of a slot in the motor that matches the height of the bearing, which makes it difficult to reduce the height of the brushless motor and makes it impossible to achieve the miniaturization design of the motor. Utility Model Content

[0004] To overcome the shortcomings mentioned above, this utility model provides a technical solution that can solve the above problems.

[0005] A brushless motor with an oil-impregnated bearing includes a base, a drive board, a stator assembly, and a mover assembly; A positioning cylinder is formed in the middle of the base, and the drive plate and stator assembly are fixedly installed on the positioning cylinder; The moving part assembly includes a rotating cover and a rotating shaft. The rotating cover covers the stator assembly and the rotating shaft is fixedly installed in the middle of the rotating cover. An oil-impregnated bearing is installed between the positioning cylinder and the rotating shaft, and the rotating shaft is rotatably installed in the positioning cylinder through the oil-impregnated bearing. The oil-impregnated bearing has a cylindrical structure. A thin shaft is formed on the outer side of the upper end of the oil-impregnated bearing. A transition curved edge is formed between the outer side wall of the thin shaft and the outer side wall of the oil-impregnated bearing. A limiting ring is formed at the upper end of the positioning cylinder. The positioning cylinder, the limiting ring and the thin shaft form an oil storage groove structure. Several vertical grooves are formed on the outer side of the oil-impregnated bearing. The several vertical grooves are arranged in a circular array with each other. The upper end of the vertical grooves leads into the oil storage groove structure.

[0006] Furthermore: the lower end of the vertical groove extends out of the positioning cylinder, an oil baffle ring is sleeved on the rotating shaft, the oil baffle ring covers the lower end of the positioning cylinder, a limit groove is formed on the rotating shaft, a retaining spring is installed in the limit groove with clearance fit, and the oil baffle ring abuts against the retaining spring for installation limit.

[0007] Furthermore: a first countersunk groove is formed on the inner side of the lower end of the positioning cylinder, and the oil baffle ring is fitted into the first countersunk groove with a clearance fit.

[0008] Furthermore, the retaining ring is made of PEEK (polyether ether ketone) engineering plastic.

[0009] Furthermore: the stator assembly is fixedly mounted on the drive board. The stator assembly includes a wire frame, a rubber-coated frame, and copper wire windings. Several winding slots are formed on the outer side of the wire frame. The rubber-coated frame covers and is installed on the several winding slots of the wire frame. The copper wire windings are wound and installed in the rubber-coated frame. The copper wire windings and the winding slots are insulated and separated by the rubber-coated frame. The copper wire windings and the drive board are electrically connected to each other.

[0010] Furthermore: the moving part assembly includes a rotating cover, a permanent magnet ring, and a rotating shaft. The rotating shaft is fixedly installed in the middle of the rotating cover, the permanent magnet ring is fixedly installed on the inner side of the rotating cover, and the stator assembly's wire frame is fitted with the permanent magnet ring with a clearance fit.

[0011] Compared with existing technologies, this utility model utilizes the structural design of an oil-impregnated bearing to store lubricating oil in an oil reservoir formed between the thin shaft and the positioning cylinder. When the brushless motor is running, the lubricating oil is evenly distributed between the oil-impregnated bearing and the positioning cylinder along the vertical grooves around the oil-impregnated bearing, achieving full lubrication for rotation. By replacing the traditional double ball bearing installation method with a single oil-impregnated bearing, effective noise reduction is achieved during the operation of the brushless motor. At the same time, it can avoid the defects of poor concentricity of double ball bearings, ensuring the production quality of the brushless motor and reducing manufacturing costs.

[0012] 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

[0013] 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.

[0014] Figure 1 This is an exploded structural diagram of the present invention; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a half-sectional structural diagram of the present invention; Figure 4 yes Figure 3A schematic diagram of the structure when the rotating cover and permanent magnet ring are concealed; Figure 5 yes Figure 3 This is a structural diagram from another perspective; Figure 6 yes Figure 5 A schematic diagram of the structure when the rotating cover and permanent magnet ring are concealed; Figure 7 yes Figure 1 A structural diagram from another perspective.

[0015] The figure shows: 1. Base; 2. Drive board; 3. Stator assembly; 31. Wire frame; 311. Iron core lamination; 32. Rubber-coated frame; 33. Copper wire winding; 4. Mover assembly; 41. Rotating cover; 42. Permanent magnet ring; 43. Shaft; 5. Positioning cylinder; 6. Round hole; 7. Oil-impregnated bearing; 8. Winding groove; 9. PIN pin; 10. Pin hole; 11. Thin shaft; 12. Transition curved edge; 13. Limiting ring; 14. Oil reservoir; 15. Vertical groove; 16. Oil baffle ring; 17. Limiting groove; 18. Snap ring; 19. First countersunk groove; 20. Second countersunk groove; 21. Graphite gasket; 22. Connector. Detailed Implementation

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] Example 1, as Figure 1-7 As shown, the present invention discloses a brushless motor with an oil-impregnated bearing, comprising a base 1, a drive plate 2, a stator assembly 3, and a mover assembly 4. The base 1 has a positioning cylinder 5 formed in the middle, and the drive plate 2 and the stator assembly 3 are both fixedly installed on the positioning cylinder 5. The moving part assembly 4 includes a rotating cover 41 and a rotating shaft 43. The rotating cover 41 covers the stator assembly 3. The rotating shaft 43 is fixedly installed in the middle of the rotating cover 41. An oil-impregnated bearing 7 is installed between the positioning cylinder 5 and the rotating shaft 43. The rotating shaft 43 is rotatably installed in the positioning cylinder 5 through the oil-impregnated bearing 7. The oil-impregnated bearing 7 has a cylindrical structure. A thin shaft 11 is formed on the outer side of the upper end of the oil-impregnated bearing 7. A transition curved edge 12 is formed between the outer side wall of the thin shaft 11 and the outer side wall of the oil-impregnated bearing 7. A limiting ring 13 is formed at the upper end of the positioning cylinder 5. The positioning cylinder 5, the limiting ring 13 and the thin shaft 11 form an oil storage tank 14 structure. Several vertical grooves 15 are formed on the outer side of the oil-impregnated bearing 7. The several vertical grooves 15 are arranged in a circular array with each other. The upper end of the vertical grooves 15 passes into the oil storage tank 14 structure. The principle is as follows: by utilizing the structural design of the oil-impregnated bearing 7, lubricating oil is stored in the oil reservoir 14 formed between the thin shaft 11 and the positioning cylinder 5. When the brushless motor is running, the lubricating oil will be evenly distributed between the oil-impregnated bearing 7 and the positioning cylinder 5 along the vertical groove 15 around the oil-impregnated bearing 7, so as to achieve full lubrication rotation. By replacing the traditional double ball bearing installation method with a single oil-impregnated bearing 7, the noise of the brushless motor is effectively reduced when it is working. At the same time, it can also avoid the defect of poor concentricity of double ball bearings, ensure the production quality of the brushless motor, and reduce the manufacturing cost.

[0022] Furthermore: the lower end of the vertical groove 15 extends out of the positioning cylinder 5, and an oil baffle ring 16 is sleeved on the rotating shaft 43, covering the lower end of the positioning cylinder 5. A limiting groove 17 is formed on the rotating shaft 43, and a retaining spring 18 is installed in the limiting groove 17 with clearance fit. The oil baffle ring 16 abuts against the retaining spring 18 for installation limitation. The setting of the oil baffle ring 16 can reduce the occurrence of oil leakage, and at the same time can effectively cover the positioning cylinder 5 and reduce noise transmission.

[0023] Furthermore, the lower end of the positioning cylinder 5 has a first countersunk groove 19 formed on its inner side, and the oil baffle ring 16 is fitted into the first countersunk groove 19 with a clearance fit, making the installation of the oil baffle ring 16 more stable.

[0024] Furthermore, the retaining ring 18 is made of PEEK (polyether ether ketone) engineering plastic, which can effectively clamp the oil retaining ring 16 to achieve precise fixation.

[0025] Furthermore: the stator assembly 3 is fixedly mounted on the drive plate 2. The stator assembly 3 includes a wire frame 31, a rubber-coated frame 32, and a copper wire winding 33. The outer side of the wire frame 31 is formed with several winding slots 8. The rubber-coated frame 32 covers and is installed on the several winding slots 8 of the wire frame 31. The copper wire winding 33 is wound and installed in the rubber-coated frame 32, and the copper wire winding 33 and the winding slots 8 are insulated and separated by the rubber-coated frame 32. The copper wire winding 33 and the drive plate 2 are electrically connected to each other. Compared with the existing brushless motor, the related structure of the rubber-coated frame 32 has been added. The design of the rubber-coated frame 32 can achieve sufficient insulation between the wire frame 31 and the copper wire winding 33, and at the same time achieve precise winding of the copper wire winding 33, thus accelerating its production efficiency.

[0026] Furthermore: the mover assembly 4 includes a rotating cover 41, a permanent magnet ring 42, and a rotating shaft 43. The rotating shaft 43 is fixedly installed in the middle of the rotating cover 41, and the permanent magnet ring 42 is fixedly installed on the inner side of the rotating cover 41. The wire frame 31 of the stator assembly 3 is fitted into the permanent magnet ring 42 with a clearance fit. When the copper wire winding 33 of the stator assembly 3 is energized, a magnetic field can be formed on the wire frame 31. This magnetic field can match the magnetic field of the permanent magnet ring 42, thereby driving the mover assembly 4 to rotate at high speed, which can ensure the stable operation of the brushless motor.

[0027] Example 2, as Figure 1-7 As shown, the brushless motor of this utility model includes a base 1, a drive board 2, a stator assembly 3, and a mover assembly 4. A positioning cylinder 5 is formed in the middle of the base 1, and a round hole 6 is formed in the middle of the drive plate 2. The positioning cylinder 5 is installed in the round hole 6 with clearance fit. The drive plate 2 is fixedly installed on the base 1, and the stator assembly 3 is fixedly installed on the positioning cylinder 5. The moving part assembly 4 includes a rotating cover 41, a permanent magnet ring 42 and a rotating shaft 43. The rotating shaft 43 is fixedly installed in the middle of the rotating cover 41, the permanent magnet ring 42 is fixedly installed on the inner side of the rotating cover 41, and the stator assembly 3 is installed in the permanent magnet ring 42 with clearance fit. An oil-impregnated bearing 7 is fitted between the positioning cylinder 5 and the rotating shaft 43, and the rotating shaft 43 is rotatably fitted inside the positioning cylinder 5 through the oil-impregnated bearing 7. The principle is as follows: by using a bearing to replace the traditional double ball bearing structure, the concentricity of the rotating shaft 43 is guaranteed during rotation. There is no problem of concentricity misalignment caused by the assembly of double ball bearings. At the same time, the noise of the oil-impregnated bearing 7 is lower than that of the ball bearing when running at high speed. It also improves the product yield after assembly. In addition, using a single oil-impregnated bearing 7 to replace the existing double ball bearing can effectively reduce the design height of the brushless motor product, realize the miniaturization of the brushless motor, and achieve higher integration.

[0028] Furthermore: The stator assembly 3 is fixedly mounted on the drive plate 2. The stator assembly 3 includes a wire frame 31, a rubber-coated frame 32, and a copper wire winding 33. The outer side of the wire frame 31 is formed with a plurality of winding slots 8, which are arranged in a circular array. The rubber-coated frame 32 covers and is installed on the plurality of winding slots 8 of the wire frame 31. The copper wire winding 33 is wound and installed in the rubber-coated frame 32, and the copper wire winding 33 and the winding slots 8 are insulated and separated by the rubber-coated frame 32. The copper wire winding 33 and the drive plate 2 are electrically connected to each other. Compared with the existing technology of directly coating the winding slots 8 of the wire frame 31 with insulating glue, the addition of the rubber-coated frame 32 can speed up the production efficiency of the wire frame 31, and at the same time, it will not cause uneven glue thickness, ensuring the precise winding of the copper wire winding 33.

[0029] Furthermore: the wire frame 31 includes a plurality of iron core laminations 311, which are stacked one on top of the other. The winding grooves 8 are integrally formed on the outside of the iron core laminations 311, and the winding grooves 8 of two adjacent iron core laminations 311 are arranged vertically corresponding to each other. The rubber-coated frame 32 is covered and installed on the winding grooves 8 of the plurality of iron core laminations 311, and the bottom side of the rubber-coated frame 32 is fixedly installed on the drive plate 2. The stacking arrangement of the iron core laminations 311 ensures the stability of the overall wire frame 31, thereby effectively strengthening the strength of the wire frame 31 and ensuring its service life. Moreover, the rubber-coated frame 32 has an insulating effect. When it is directly fixed to the drive plate 2, it can prevent the wire frame 31 from directly contacting the drive plate 2 electrically, ensuring stability when energized and thus avoiding short circuit damage.

[0030] Furthermore, the bottom side of the rubber-coated frame 32 is inlaid with several PIN pins 9, and the drive board 2 is formed with several pin holes 10. The PIN pins 9 are inserted into the pin holes 10 with a gap fit and are welded and fixed. The end of the copper wire winding 33 is wound and welded to the PIN pins 9. The pin holes 10 and the drive board 2 are electrically connected to each other. This facilitates the wiring operation on the drive board 2 after the copper wire winding 33 is wound, thereby speeding up production efficiency.

[0031] Furthermore: the oil-impregnated bearing 7 has a cylindrical structure, with a thin shaft 11 formed on the outer side of the upper end of the oil-impregnated bearing 7. A transition curved edge 12 is formed between the outer wall of the thin shaft 11 and the outer wall of the oil-impregnated bearing 7. A limiting ring 13 is formed at the upper end of the positioning cylinder 5. The positioning cylinder 5, the limiting ring 13, and the thin shaft 11 form an oil storage tank 14 structure. Several vertical grooves 15 are formed on the outer side of the oil-impregnated bearing 7. The vertical grooves 15 are arranged in a circular array with each other. The upper end of the vertical grooves 15 leads into the oil storage tank 14 structure. The oil storage tank 14 stores lubricating oil, which can be replenished between the positioning cylinder 5 and the oil-impregnated bearing 7 through the surrounding vertical grooves 15, thereby achieving sufficient lubrication, reducing sliding friction, effectively reducing the noise generated when the motor is working, and also ensuring the production quality of the motor.

[0032] Furthermore: the lower end of the vertical groove 15 extends out of the positioning cylinder 5, and an oil baffle ring 16 is sleeved on the rotating shaft 43, covering the lower end of the positioning cylinder 5. A limiting groove 17 is formed on the rotating shaft 43, and a retaining spring 18 is installed in the limiting groove 17 with clearance fit. The oil baffle ring 16 abuts against the retaining spring 18 for installation limitation. The oil baffle ring 16 can be used to block and prevent excessive wear of lubricant. The retaining spring 18 can provide a limiting function for the oil baffle ring 16, ensuring that the oil baffle ring 16 will not move on its own.

[0033] Furthermore, the inner side of the lower end of the positioning cylinder 5 is formed with a first countersunk groove 19, and the oil baffle ring 16 is fitted into the first countersunk groove 19 with a clearance fit; this allows the oil baffle ring 16 to sink into the first countersunk groove 19, making the height design more reasonable and realizing the miniaturization design of the motor product.

[0034] Furthermore, the retaining ring 18 is made of PEEK (polyether ether ketone) engineering plastic; it has the functions of high temperature resistance, high strength and noise reduction, which can effectively reduce the noise generated by the motor product during operation.

[0035] Furthermore, a second countersunk groove 20 is formed on the inner side of the upper end of the positioning cylinder 5, and a graphite gasket 21 is installed in the second countersunk groove 20 with clearance fit; the graphite gasket 21 can effectively cover the upper end of the positioning cylinder 5 in conjunction with the second countersunk groove 20, and the graphite gasket 21 has a sound insulation effect, which can effectively reduce the noise generated when the bearing is in operation.

[0036] Furthermore: the rotating cover 41 and the base 1 are spaced apart vertically, and the drive plate 2 is located between the rotating cover 41 and the base 1. A connector 22 is embedded in the drive plate 2; the connector 22 can be used to perform external wiring operations, thereby facilitating the actual installation and use of the motor product.

[0037] 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 brushless motor with an oil-impregnated bearing, comprising a base, a drive plate, a stator assembly, and a mover assembly; characterized in that: A positioning cylinder is formed in the middle of the base, and the drive plate and stator assembly are fixedly installed on the positioning cylinder; The moving part assembly includes a rotating cover and a rotating shaft. The rotating cover covers the stator assembly and the rotating shaft is fixedly installed in the middle of the rotating cover. An oil-impregnated bearing is installed between the positioning cylinder and the rotating shaft, and the rotating shaft is rotatably installed in the positioning cylinder through the oil-impregnated bearing. The oil-impregnated bearing has a cylindrical structure. A thin shaft is formed on the outer side of the upper end of the oil-impregnated bearing. A transition curved edge is formed between the outer side wall of the thin shaft and the outer side wall of the oil-impregnated bearing. A limiting ring is formed at the upper end of the positioning cylinder. The positioning cylinder, the limiting ring and the thin shaft form an oil storage groove structure. Several vertical grooves are formed on the outer side of the oil-impregnated bearing. The several vertical grooves are arranged in a circular array with each other. The upper end of the vertical grooves leads into the oil storage groove structure.

2. The brushless motor with an oil-impregnated bearing according to claim 1, characterized in that: The lower end of the vertical groove extends out of the positioning cylinder. An oil baffle ring is sleeved on the rotating shaft, covering the lower end of the positioning cylinder. A limit groove is formed on the rotating shaft, and a retaining spring is installed in the limit groove with clearance fit. The oil baffle ring abuts against the retaining spring for installation limit.

3. A brushless motor with an oil-impregnated bearing according to claim 2, characterized in that: The lower end of the positioning cylinder has a first countersunk groove formed on its inner side, and the oil baffle ring is fitted into the first countersunk groove with a clearance fit.

4. A brushless motor with an oil-impregnated bearing according to any one of claims 2 or 3, characterized in that: The retaining ring is made of PEEK (polyetheretherketone) engineering plastic.

5. A brushless motor with an oil-impregnated bearing according to claim 1, characterized in that: The stator assembly is fixedly mounted on the drive board. The stator assembly includes a wire frame, a rubber-coated frame, and copper wire windings. Several winding slots are formed on the outer side of the wire frame. The rubber-coated frame covers and is installed on the several winding slots of the wire frame. The copper wire windings are wound and installed in the rubber-coated frame, and the copper wire windings and the winding slots are insulated and separated by the rubber-coated frame. The copper wire windings and the drive board are electrically connected to each other.

6. A brushless motor with an oil-impregnated bearing according to claim 5, characterized in that: The moving part assembly includes a rotating cover, a permanent magnet ring, and a rotating shaft. The rotating shaft is fixedly installed in the middle of the rotating cover, the permanent magnet ring is fixedly installed on the inner side of the rotating cover, and the stator assembly's wire frame is fitted into the permanent magnet ring with a clearance fit.

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