A brushless motor oil filling port sealing structure and a brushless motor

Abstract

The utility model discloses a kind of for brushless motor oil filler port sealing structure, including the oil filler port being opened in the upper cover of brushless motor, recessed hole is provided in the upper portion of the oil filler port, limit ring table is provided in the recessed hole bottom portion, oil inlet channel is provided in the lower portion of the oil filler port with the intercommunication of the limit ring table, sealing washer is provided in the limit ring table, sealing column is provided in the oil filler port, the sealing column is connected in the oil inlet channel after passing the sealing washer, sealing glue is filled in the oil filler port above the limit ring table, the sealing glue completely covers the sealing column upper portion. The utility model is simple in structure, and through sealing washer, sealing column and sealing glue are carried out composite sealing to oil filler port, effectively solve the leakage problem of brushless motor under high-speed rotation and temperature alternation working condition.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, specifically to a sealing structure for the oil inlet of a brushless motor and a brushless motor. Background Technology

[0002] The rotor of a brushless motor is supported on a fixed shaft by ball bearings to achieve high-speed, low-friction rotation. To reduce friction between the balls and the inner and outer raceways, prevent wear, dissipate heat, prevent corrosion, and isolate contaminants, the bearing interior must be filled or coated with grease. Currently, grease ports are typically provided on the rotor housing to allow for grease filling. The sealing reliability of these ports directly affects the motor's lifespan and operational stability. Traditional grease port seals rely primarily on gaskets and screws; however, during high-speed rotor operation, screws can easily loosen, leading to leaks.

[0003] Therefore, the existing sealing structure for the oil inlet of brushless motors needs further improvement. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an oil inlet sealing structure that is simple in structure, can effectively seal the oil inlet, and effectively prevent loosening and leakage.

[0005] Another objective of this invention is to provide a brushless motor that includes the aforementioned oil inlet sealing structure.

[0006] Regarding the oil inlet sealing structure, in order to achieve the above-mentioned objectives, this utility model adopts the following solution: A sealing structure for the oil inlet of a brushless motor includes an oil inlet provided on the upper cover of the brushless motor, a groove hole provided in the upper part of the oil inlet, a limiting ring platform provided at the bottom of the groove hole, an oil inlet channel connected to the limiting ring platform provided in the lower part of the oil inlet, a sealing gasket provided in the limiting ring platform, a sealing post provided in the oil inlet, the sealing post passing through the sealing gasket and connected to the oil inlet channel, and sealant filling the oil inlet above the limiting ring platform, the sealant completely covering the upper part of the sealing post.

[0007] As another improvement to the sealing structure of the oil inlet of the brushless motor of this utility model, a limiting ring groove is provided on the inner wall of the groove, and the inner diameter of the limiting ring groove is larger than the inner diameter of the groove.

[0008] As another improvement to the oil filling port sealing structure of this utility model, a number of positioning grooves are provided at intervals on the inner wall of the groove.

[0009] As another improvement to the oil filling port sealing structure of this utility model, an arc-shaped groove is provided on the outer wall of the sealing gasket.

[0010] As another improvement to the oil inlet sealing structure of this utility model for brushless motors, at least one sealing protrusion is provided on the limiting ring platform.

[0011] As another improvement to the oil inlet sealing structure of this utility model for brushless motors, an outer cover is screwed or snapped onto the outer wall of the upper end of the oil inlet.

[0012] Regarding the brushless motor, in order to achieve the above objectives, this utility model adopts the following solution: a brushless motor, including a lower cover, a middle cover provided on the outer periphery of the lower cover, a plurality of strong magnetic sheets evenly distributed along the circumferential direction on the inner wall of the middle cover, a mounting seat provided at the center of the lower cover, a first bearing provided in the mounting seat, a fixed shaft provided in the first bearing, a bracket sleeved on the outer wall of the fixed shaft above the first bearing, a stator core provided on the outer periphery of the bracket, a coil wound on the stator core, an upper cover provided at the upper end of the middle cover, a bushing provided at the center of the upper cover, a second bearing provided in the bushing sleeve, the second bearing sleeved on the fixed shaft, a shaft sealing mechanism provided in the bushing sleeve, an oil inlet provided on the upper cover, and an oil inlet sealing structure as described in any of the above embodiments provided in the oil inlet, the lower cover, middle cover, upper cover, and shaft sealing mechanism forming a sealed oil storage cavity.

[0013] As another improvement of the brushless motor of this utility model, the bracket includes a sleeve, a frame is provided outside the sleeve, an mounting ring groove is provided on the outer periphery of the frame, and the stator core is disposed in the mounting ring groove.

[0014] As another improvement to the brushless motor of this utility model, the shaft sealing mechanism includes a first limiting step, a second limiting step, a third limiting step, and a fourth limiting step arranged sequentially in a bushing tube above the second bearing. A first sealing ring is arranged in the first limiting step, a second sealing ring is arranged on the second limiting step, a first positioning ring is arranged in the bushing tube between the first sealing ring and the second sealing ring, a sealing sleeve is arranged on the third limiting step, a second positioning ring is arranged in the bushing tube between the sealing sleeve and the second sealing ring, and an end cap is arranged in the fourth limiting step. The fixed shaft passes sequentially through the first sealing ring, the first positioning ring, the second sealing ring, the second positioning ring, the sealing sleeve, and the end cap.

[0015] As another improvement of the brushless motor of this utility model, multiple connecting seats are evenly distributed at the center of the outer side of the lower cover, and an outer reinforcing rib is provided on the lower cover between the connecting seats. An inner protrusion is provided on the inner side of the lower cover at a position corresponding to the connecting seat, and an inner reinforcing rib is provided between the inner protrusions. A connecting hole is provided on the connecting seat, and the connecting hole extends into the inner protrusion.

[0016] In summary, the advantages of this utility model compared to the prior art are: the utility model has a simple structure and effectively solves the leakage problem of brushless motors under high-speed rotation and temperature alternation conditions by using a sealing gasket, sealing post and sealing adhesive to achieve composite sealing of the oil injection port. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0018] Figure 2 This is one of the cross-sectional schematic diagrams of this utility model.

[0019] Figure 3 for Figure 2 Enlarged diagram of point A in the middle.

[0020] Figure 4 This is a schematic diagram of the first embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the third embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the fourth embodiment of the present invention.

[0023] Figure 7 This is the second cross-sectional schematic diagram of the present invention.

[0024] Figure 8 for Figure 7 Enlarged diagram of point B in the middle.

[0025] Figure 9 This is one of the schematic diagrams of the lower cover of this utility model.

[0026] Figure 10 This is the second schematic diagram of the lower cover of this utility model. Detailed Implementation

[0027] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings.

[0028] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0029] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0030] Furthermore, it should be noted that, in the description of this utility model, 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 according to the specific circumstances.

[0031] like Figure 1-10 As shown, a sealing structure for the oil inlet of a brushless motor includes an oil inlet 2 on the upper cover 1 of the brushless motor, a groove 3 in the upper part of the oil inlet 2, a limiting ring 4 at the bottom of the groove 3, an oil inlet channel 5 communicating with the limiting ring 4 in the lower part of the oil inlet 2, a sealing gasket 6 in the limiting ring 4, a sealing post 7 in the oil inlet 2, the sealing post 7 passing through the sealing gasket 6 and connecting to the oil inlet channel 5, and sealant 8 filling the oil inlet 2 above the limiting ring 4, the sealant 8 completely covering the upper part of the sealing post 7.

[0032] In this invention, an oil-resistant rubber sealing gasket 6 is embedded in the limiting ring 4 at the bottom of the groove hole 3. A sealing post 7 presses the sealing gasket 6 against the surface of the limiting ring 4, forming an initial sealing interface to prevent oil overflow. One embodiment of the sealing post 7 is a screw. The cavity above the limiting ring 4 is filled with high-temperature resistant epoxy sealant 8, which completely covers the exposed section of the sealing post 7 and cures, forming a tight composite seal with the inner wall of the oil inlet 2, completely sealing off the intrusion channel from the external environment. This also effectively prevents the sealing post 7 from loosening due to vibrations during motor rotation.

[0033] In the first embodiment of this utility model, a limiting annular groove 10 is provided on the inner wall of the groove 9, and the inner diameter of the limiting annular groove 10 is larger than the inner diameter of the groove 9. When the sealant 8 is filled, the sealant 8 can fill the limiting annular groove 10. After the sealant 8 cures, it can form a stable anchor, preventing the sealant 8 from moving upward, thereby effectively locking it.

[0034] In a second embodiment of this invention, a plurality of positioning grooves 11 are provided at intervals on the inner wall of the groove 9. When the sealant 8 is filled, the sealant 8 can fill each positioning groove 11. After the sealant 8 has cured, it can also form a stable anchor, preventing the sealant 8 from moving upward and thus effectively locking it.

[0035] In a third embodiment of this invention, based on any of the above embodiments, an arc-shaped groove 12 is provided on the outer wall of the sealing gasket 6. When the sealant 8 is filled, the sealant 8 can fill the arc-shaped groove 12, thereby forming a physical interlock with the sealing gasket 6, thus improving the sealing effect.

[0036] In the fourth embodiment of this utility model, at least one sealing protrusion 13 is provided on the limiting ring platform 4. When the sealing column 7 moves down and compresses the sealing gasket 6, the sealing gasket 6 deforms under pressure, completely covering the sealing protrusion 13, thereby forming a sealing barrier. This greatly improves the sealing effect of the sealing gasket 6.

[0037] In the fifth embodiment of this utility model, an outer cover 14 is screwed or snapped onto the outer wall of the upper end of the oil inlet 2. The outer cover 14 can effectively prevent the sealant 8 from detaching due to collision or scratching by sharp objects, ensuring safety and reliability.

[0038] This utility model relates to a brushless motor, comprising a lower cover 15, a middle cover 16 disposed on the outer periphery of the lower cover 15, a plurality of strong magnetic sheets 17 evenly distributed along the circumferential direction on the inner wall of the middle cover 16, a mounting base 18 disposed at the center of the lower cover 15, a first bearing 19 disposed within the mounting base 18, a fixed shaft 20 disposed within the first bearing 19, a bracket 21 sleeved on the outer wall of the fixed shaft 20 above the first bearing 19, and a stator core 22 disposed on the outer periphery of the bracket 21. A coil is wound on the core 22. An upper cover 1 is provided on the upper end of the middle cover 16. A bushing 23 is provided at the center of the upper cover 1. A second bearing 24 is provided inside the bushing 23. The second bearing 24 is sleeved on the fixed shaft 20. A shaft sealing mechanism 25 is provided inside the bushing 23. An oil inlet 2 is provided on the upper cover 1. An oil inlet sealing structure as described above is provided inside the oil inlet 2. The lower cover 15, the middle cover 16, the upper cover 1, and the shaft sealing mechanism 25 form a closed oil storage cavity 26.

[0039] The bracket 21 of this utility model includes a sleeve 27, a frame 28 is provided outside the sleeve 27, and an mounting ring groove 29 is provided on the outer periphery of the frame 28, and the stator core 22 is disposed in the mounting ring groove 29.

[0040] The shaft sealing mechanism 25 of this utility model includes a first limiting step 30, a second limiting step 31, a third limiting step 32, and a fourth limiting step 33 sequentially arranged within a shaft sleeve 23 positioned above the second bearing 24. A first sealing ring 34 is arranged within the first limiting step 30, a second sealing ring 35 is arranged on the second limiting step 31, a first positioning ring 36 is arranged within the shaft sleeve 23 between the first and second sealing rings 34 and 35, a sealing sleeve 37 is arranged on the third limiting step 32, a second positioning ring 38 is arranged within the shaft sleeve 23 between the sealing sleeve 37 and the second sealing ring 35, and an end cap 39 is arranged within the fourth limiting step 33. The fixed shaft 20 passes sequentially through the first sealing ring 34, the first positioning ring 36, the second sealing ring 35, the second positioning ring 38, the sealing sleeve 37, and the end cap 39. This utility model achieves multiple seals using the first sealing ring 34, the second sealing ring 35, and the sealing sleeve 37, resulting in a good sealing effect.

[0041] The lower cover 15 of this utility model has a plurality of connecting seats 40 evenly distributed at the center of the outer side. An outer reinforcing rib 41 is provided on the lower cover 15 between the connecting seats 40. An inner protrusion 42 is provided on the inner side of the lower cover 15 at a position corresponding to the connecting seat 40. An inner reinforcing rib 43 is provided between the inner protrusions 42. A connecting hole 44 is provided on the connecting seat 40, and the connecting hole 44 extends into the inner protrusion 42.

[0042] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A sealing structure for the oil inlet of a brushless motor, comprising an oil inlet (2) formed on the upper cover (1) of the brushless motor, characterized in that: A groove hole (3) is provided in the upper part of the oil filling port (2), a limiting ring platform (4) is provided at the bottom of the groove hole (3), an oil inlet channel (5) is provided in the lower part of the oil filling port (2) and communicates with the limiting ring platform (4), a sealing gasket (6) is provided in the limiting ring platform (4), a sealing column (7) is provided in the oil filling port (2), the sealing column (7) passes through the sealing gasket (6) and is connected in the oil inlet channel (5), and the oil filling port (2) above the limiting ring platform (4) is filled with sealant (8), the sealant (8) completely covers the upper part of the sealing column (7).

2. The sealing structure for the oil inlet of a brushless motor according to claim 1, characterized in that: A limiting annular groove (10) is provided on the inner wall of the groove (9), and the inner diameter of the limiting annular groove (10) is larger than the inner diameter of the groove (9).

3. The sealing structure for the oil inlet of a brushless motor according to claim 1, characterized in that: A plurality of positioning grooves (11) are provided at intervals on the inner wall of the groove (9).

4. The sealing structure for the oil inlet of a brushless motor according to claim 1, characterized in that: An arc-shaped groove (12) is provided on the outer wall of the sealing gasket (6).

5. A sealing structure for the oil inlet of a brushless motor according to claim 1, characterized in that: At least one sealing protrusion (13) is provided on the limiting ring platform (4).

6. A sealing structure for the oil inlet of a brushless motor according to any one of claims 1-5, characterized in that: An outer cap (14) is screwed or snapped onto the outer wall of the upper end of the oil inlet (2).

7. A brushless motor, comprising a lower cover (15), a middle cover (16) disposed on the outer periphery of the lower cover (15), a plurality of strong magnetic sheets (17) evenly distributed along the circumferential direction on the inner wall of the middle cover (16), a mounting base (18) disposed at the center inside the lower cover (15), a first bearing (19) disposed in the mounting base (18), a fixed shaft (20) disposed in the first bearing (19), and a bracket (21) sleeved on the outer wall of the fixed shaft (20) above the first bearing (19). A stator core (22) is provided on the outer periphery of the bracket (21), and a coil is wound on the stator core (22). An upper cover (1) is provided on the upper end of the middle cover (16), and a bushing (23) is provided at the center of the upper cover (1). A second bearing (24) is provided inside the bushing (23), and the second bearing (24) is sleeved on the fixed shaft (20). A shaft sealing mechanism (25) is provided inside the bushing (23), and an oil inlet (2) is provided on the upper cover (1). The characteristic feature is that: An oil filling port sealing structure as described in any one of claims 1-6 is provided inside the oil filling port (2), and the lower cover (15), middle cover (16), upper cover (1), and shaft sealing mechanism (25) form a closed oil storage cavity (26).

8. The brushless motor according to claim 7, characterized in that: The bracket (21) includes a sleeve (27), a frame (28) is provided outside the sleeve (27), an mounting ring groove (29) is provided on the outer periphery of the frame (28), and the stator core (22) is disposed in the mounting ring groove (29).

9. The brushless motor according to claim 7, characterized in that: The shaft sealing mechanism (25) includes a first limiting step (30), a second limiting step (31), a third limiting step (32), and a fourth limiting step (33) sequentially arranged inside a bushing (23) above the second bearing (24). A first sealing ring (34) is arranged inside the first limiting step (30), and a second sealing ring (35) is arranged on the second limiting step (31). A sealing ring is arranged inside the bushing (23) between the first sealing ring (34) and the second sealing ring (35). The first positioning ring (36) has a sealing sleeve (37) on the third limiting step (32), a second positioning ring (38) is provided in the bushing tube (23) between the sealing sleeve (37) and the second sealing ring (35), and an end cap (39) is provided in the fourth limiting step (33). The fixed shaft (20) passes through the first sealing ring (34), the first positioning ring (36), the second sealing ring (35), the second positioning ring (38), the sealing sleeve (37) and the end cap (39) in sequence.

10. The brushless motor according to claim 7, characterized in that: Multiple connecting seats (40) are evenly distributed at the center of the outer side of the lower cover (15). An outer reinforcing rib (41) is provided on the lower cover (15) between the connecting seats (40). An inner protrusion (42) is provided on the inner side of the lower cover (15) at a position corresponding to the connecting seat (40). An inner reinforcing rib (43) is provided between the inner protrusions (42). A connecting hole (44) is provided on the connecting seat (40), and the connecting hole (44) extends into the inner protrusion (42).

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