Motor bearing seal structure

Abstract

The utility model relates to a kind of motor bearing sealing structure with better sealing effect between bearing outer cover and oil-throwing disc, including motor shaft, bearing inner cover, motor end cover, bearing, bearing outer cover, O type sealing ring and oil-throwing disc, the bearing is installed in motor end cover and the bearing hole of bearing is installed with motor shaft, the inside of motor end cover is equipped with bearing inner cover and the outside of motor end cover is equipped with bearing outer cover, oil-throwing disc is installed on the motor shaft and curve-shaped gap that multiple labyrinths are formed is equipped between oil-throwing disc and bearing outer cover, annular groove is equipped on the outer circular surface of oil-throwing disc and annular groove is located in curve-shaped gap, O type sealing ring is equipped in annular groove and O type sealing ring forms radial seal to curve-shaped gap. Advantage: a kind of motor bearing sealing structure uses double sealing measures between bearing outer cover and oil-throwing disc, so that a kind of motor bearing sealing structure has better sealing effect.

Description

Technical Field

[0001] This utility model belongs to the field of motor manufacturing technology, and specifically relates to a motor bearing sealing structure. Background Technology

[0002] CN 201393119 Y, entitled "A Waterproof Motor Bearing Sealing Structure," includes an end cover, an inner bearing cover, a bearing, an outer bearing cover, and a motor shaft. Two angular contact bearings are mounted side-by-side in opposite directions inside the end cover. The motor shaft is mounted within the inner ring of the bearing. The inner bearing cover is installed inside the end cover to position the bearing. The outer bearing cover is mounted on the end cover and fixes the outer bearing ring. A protective cover is installed on the motor shaft outside the inner bearing ring and is adjusted and fixed with a round nut. A turntable is installed at the end of the motor shaft, with a curved gap between the turntable and the outer bearing cover forming a multi-layered labyrinth seal. An oil seal is installed between the motor shaft and the outer bearing cover. An O-ring is installed on the contact surface between the outer bearing cover and the end cover. Its drawback is that the multi-layered labyrinth seal between the turntable and the outer bearing cover in this waterproof motor bearing sealing structure results in a relatively poor sealing effect. Utility Model Content

[0003] Design objective: To overcome the shortcomings of the prior art, a motor bearing sealing structure with better sealing effect between the bearing outer cover and the oil slinger is designed.

[0004] Design scheme: To achieve the above design objectives.

[0005] 1. The oil slinger is mounted on the motor shaft and there is a curved gap between the oil slinger and the bearing cover to form a multiple labyrinth seal. The outer circular surface of the oil slinger is provided with an annular groove and the annular groove is located in the curved gap. The design of the O-ring seal forming a radial seal on the curved gap is one of the technical features of this utility model. The purpose of this design is as follows: an oil slinger is installed on the motor shaft, and a curved gap forming a multi-layered labyrinth seal is provided between the oil slinger and the bearing outer cover. An annular groove is provided on the outer circumference of the oil slinger, and the annular groove is located in the curved gap. An O-ring is provided in the annular groove, and the O-ring forms a radial seal on the curved gap. That is, a motor bearing sealing structure, in addition to the multi-layered labyrinth seal formed by the bearing outer cover and the oil slinger, the bearing outer cover and the oil slinger are also sealed by an O-ring. Because the motor bearing sealing structure of this application adopts a double sealing measure between the bearing outer cover and the oil slinger, the sealing effect of the motor bearing sealing structure is relatively better. The bearing outer cover, the oil slinger, and the O-ring work together to achieve a highly efficient seal against dust, water, and grease leakage. Moreover, this sealing structure can operate for a long time, significantly improving the service life of the bearing and the reliable operation of the motor.

[0006] 2. The curved gap is composed of a first radial gap segment, a first axial gap segment, a second radial gap segment, a second axial gap segment, a third radial gap segment, and a third axial gap segment connected in sequence. The radial distance between the first axial gap segment, the second axial gap segment, and the third axial gap segment is 0.49mm-0.51mm, which is the second technical feature of this utility model. The purpose of this design is that the curved gap is composed of a first radial gap segment, a first axial gap segment, a second radial gap segment, a second axial gap segment, a third radial gap segment, and a third axial gap segment connected in sequence, with a radial distance between the first axial gap segment, the second axial gap segment, and the third axial gap segment being 0.49mm-0.51mm. Because the radial distance between the axial gap segments is 0.49mm-0.51mm, there is sufficient clearance between the bearing outer cover and the oil slinger to ensure that the oil slinger contacts and rubs against the bearing outer cover when rotating with the motor shaft, thereby ensuring the effectiveness of the motor bearing sealing structure.

[0007] 3. The design that the O-ring is made of fluororubber is the third technical feature of this utility model. The purpose of this design is that the O-ring is made of fluororubber, which has advantages such as high temperature resistance up to 300℃, resistance to acids and alkalis, and good oil resistance.

[0008] Technical solution: A motor bearing sealing structure includes a motor shaft, an inner bearing cover, a motor end cover, a bearing, an outer bearing cover, an O-ring seal, and an oil slinger. The bearing is installed inside the motor end cover, and the motor shaft is installed in the bearing hole of the bearing. The inner bearing cover is provided on the inner side of the motor end cover, and the outer bearing cover is provided on the outer side of the motor end cover. An oil slinger is installed on the motor shaft, and a curved gap forming a multiple labyrinth seal is provided between the oil slinger and the outer bearing cover. An annular groove is provided on the outer circumference of the oil slinger, and the annular groove is located in the curved gap. An O-ring seal is provided in the annular groove, and the O-ring seal forms a radial seal on the curved gap.

[0009] Compared with the prior art, the present invention provides a motor bearing sealing structure that employs a double sealing measure between the bearing outer cover and the oil slinger, resulting in a better sealing effect. Attached Figure Description

[0010] Figure 1 This is a partial cross-sectional view of a motor bearing sealing structure.

[0011] Figure 2 yes Figure 1 A magnified view of a section at circle A in the middle.

[0012] Figure 3 This is a schematic diagram of the oil-slinging disc.

[0013] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure at point BB.

[0014] Figure 5 This is a schematic diagram of the bearing outer cover. Detailed Implementation

[0015] Example 1: Refer to Appendix Figures 1-5 A motor bearing sealing structure includes a motor shaft 1, an inner bearing cover 2, a motor end cover 3, a bearing 4, an outer bearing cover 5, an O-ring seal 6, and an oil slinger 7. The bearing 4 is installed inside the motor end cover 3, and the motor shaft 1 is installed in the bearing hole of the bearing 4. The inner bearing cover 2 is provided on the inner side of the motor end cover 3, and the outer bearing cover 5 is provided on the outer side of the motor end cover 3. The oil slinger 7 is installed on the motor shaft 1, and a curved gap 8 forming a multiple labyrinth seal is provided between the oil slinger 7 and the outer bearing cover 5. An annular groove 71 is provided on the outer circular surface of the oil slinger 7, and the annular groove 71 is located in the curved gap 8. An O-ring seal 6 is provided in the annular groove 71, and the O-ring seal 6 forms a radial seal on the curved gap 8, that is, the O-ring seal 6 located in the annular groove 71 forms a sealing contact with the wall surface of the outer bearing cover 5.

[0016] The curved gap 8 is composed of a first radial gap section 81, a first axial gap section 82, a second radial gap section 83, a second axial gap section 84, a third radial gap section 85, and a third axial gap section 86 connected in sequence. The radial distance between the first axial gap section 82, the second axial gap section 84, and the third axial gap section 86 is 0.49mm-0.51mm. Because the radial distance between the axial gap sections is 0.49mm-0.51mm, there is sufficient clearance between the bearing cover and the oil slinger to ensure contact friction between the bearing cover and the oil slinger when the oil slinger rotates with the motor shaft, thereby ensuring the effectiveness of the motor bearing sealing structure.

[0017] Preferably, the radial distance between the first axial clearance section 82, the second axial clearance section 84, and the third axial clearance section 86 is 0.50 mm. The bearing outer cover 5 is fixedly mounted on the motor end cover 3 by bolts, and the oil slinger 7 is mounted on the motor shaft 1 by a heat-fitting sleeve. The O-ring seal 6 is made of fluororubber. O-ring seals made of fluororubber have advantages such as high temperature resistance up to 300℃, resistance to acids and alkalis, and good oil resistance.

[0018] It should be understood that although the above embodiments provide a relatively detailed textual description of the design concept of this utility model, these textual descriptions are merely simple textual descriptions of the design concept of this utility model, and not limitations on the design concept of this utility model. Any combination, addition, or modification that does not exceed the design concept of this utility model shall fall within the protection scope of this utility model.

Claims

1. A motor bearing sealing structure, comprising a motor shaft (1), a bearing inner cover (2), a motor end cover (3), a bearing (4), a bearing outer cover (5), an O-ring seal (6), and an oil slinger (7), wherein the bearing (4) is installed inside the motor end cover (3) and the motor shaft (1) is installed in the bearing hole of the bearing (4), the bearing inner cover (2) is provided on the inner side of the motor end cover (3) and the bearing outer cover (5) is provided on the outer side of the motor end cover (3), the oil slinger (7) is installed on the motor shaft (1) and a curved gap (8) forming a multi-layer labyrinth seal is provided between the oil slinger (7) and the bearing outer cover (5), characterized in that: The outer circular surface of the oil slinger (7) is provided with an annular groove (71) and the annular groove (71) is located in the curved gap (8). An O-ring (6) is provided in the annular groove (71) and the O-ring (6) forms a radial seal on the curved gap (8).

2. The motor bearing sealing structure according to claim 1, characterized in that: The curved gap (8) is composed of a first radial gap segment (81), a first axial gap segment (82), a second radial gap segment (83), a second axial gap segment (84), a third radial gap segment (85), and a third axial gap segment (86) connected in sequence. The radial distance between the first axial gap segment (82), the second axial gap segment (84), and the third axial gap segment (86) is 0.49mm-0.51mm.

3. The motor bearing sealing structure according to claim 2, characterized in that: The radial distance between the first axial gap section (82), the second axial gap section (84) and the third axial gap section (86) is 0.50 mm.

4. A motor bearing sealing structure according to claim 1 or 2, characterized in that: The bearing cover (5) is fixedly installed on the motor end cover (3) by bolts, and the oil slinger (7) is installed on the motor shaft (1) by heat fitting.

5. A motor bearing sealing structure according to claim 1, 2, 3, or 4, characterized in that: The O-ring (6) is made of fluororubber.

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