Motor bearing protection structure

Abstract

The utility model relates to a motor bearing protection structure, including the bearing outer cover and bearing inner cover of installing in both sides of bearing seat, be equipped with bearing and labyrinth oil seal between bearing outer cover and bearing inner cover, the bearing outer cover and the bearing inner cover between be equipped with bearing and labyrinth oil seal, the labyrinth oil seal sleeve is fixed on the pivot, be equipped with first oil baffle end and second labyrinth end on the labyrinth oil seal, first oil baffle end along the radial setting of labyrinth oil seal, second labyrinth end along the axial setting of labyrinth oil seal, the side of bearing outer cover close to labyrinth oil seal is equipped with oil seal cavity and with second labyrinth end clearance cooperation's clearance notch, first oil baffle end and oil seal cavity clearance cooperation. Compared with prior art, the utility model has the advantages of simple structure and high oil seal reliability.

Description

Technical Field

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

[0002] Currently, the existing motor bearing protection structure is achieved through a fixed bracket that is separate from the motor housing. After the bearing protection ring is installed on the fixed bracket, it is inserted into the shaft extension end of the motor housing, and then the fixed bracket with the bearing protection ring is fastened to the motor with bolts.

[0003] This type of motor bearing protective ring structure is relatively complex, requiring the cooperation of multiple components and using a large number of parts. In addition, this structure requires bolt holes to be drilled in the motor housing, which affects the motor's sealing performance, structural strength, and other issues. The material cost is high, which weakens the motor's market competitiveness. Moreover, the sealing method of this structure is poor, with the bearing protective ring basically exposed to the outside, making it impossible to achieve effective sealing. The carbon brushes of the bearing protective ring are prone to failure when in contact with liquids, dust, impurities, and other foreign objects, affecting the reliability of the motor.

[0004] Existing bearing protection structures, especially oil seal structures, are generally quite complex, or simple but with poor reliability. They cannot simultaneously achieve both a simple structure and reliable sealing. Moreover, complex protection structures make later maintenance difficult and increase maintenance costs. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology, which has a complex protective structure, leading to difficulties in later maintenance and increased maintenance costs, and to provide a protective structure for motor bearings.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An electric motor bearing protection structure includes an outer bearing cover and an inner bearing cover installed on both sides of a bearing housing, wherein a bearing and a labyrinth oil seal are provided between the outer bearing cover and the inner bearing cover.

[0008] The labyrinth oil seal is fixed on the rotating shaft. The labyrinth oil seal is provided with a first oil-blocking end and a second labyrinth end. The first oil-blocking end is arranged radially along the labyrinth oil seal, and the second labyrinth end is arranged axially along the labyrinth oil seal. The bearing outer cover is provided with an oil-sealing cavity and a clearance groove that is clearance-fitted with the second labyrinth end on the side near the labyrinth oil seal. The first oil-blocking end is clearance-fitted with the oil-sealing cavity.

[0009] Preferably, a dust cover is provided on the side of the bearing outer cover away from the bearing, and the dust cover is sleeved on the rotating shaft and fixed to the bearing outer cover.

[0010] Preferably, the dust cover is provided with a through hole that mates with the rotating shaft, and the through hole is clearance-fitted with the rotating shaft.

[0011] Preferably, the bearing outer cover has a skeleton mounting groove on the side near the dust cover, the skeleton is installed in the skeleton mounting groove, and the inner ring of the skeleton abuts against the rotating shaft.

[0012] Preferably, the skeleton is a bilip skeleton.

[0013] Preferably, the labyrinth oil seal further includes a spacer end, which is located between the first oil-blocking end and the bearing.

[0014] Preferably, the axial cross-section of the first oil-blocking end is a trapezoidal structure, and the axial thickness of the first oil-blocking end gradually decreases along the radial direction close to the oil-sealing cavity.

[0015] Preferably, the two axial side walls of the gap groove are respectively clearance-fitted with the two sides of the second labyrinth end, and the axial height of the side wall of the gap groove near the rotating shaft is greater than the axial height of the side wall away from the rotating shaft.

[0016] Preferably, both the outer bearing cover and the inner bearing cover are mounted on the bearing housing by screws.

[0017] Preferably, there are multiple second maze ends, each second maze end has a ring structure, and all second maze ends are coaxially distributed.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) In this solution, a labyrinth oil seal is set in the oil sealing cavity between the bearing and the bearing cover, and a gap groove is set on the bearing cover. Based on the gap between the first oil-blocking end of the labyrinth oil seal and the side wall of the oil sealing cavity, and the U-shaped path between the second labyrinth end and the gap groove, a reliable labyrinth gap is formed. The seal rotates with the shaft, which can effectively prevent the bearing grease from overflowing. The sealing reliability is high, and it can be achieved by only an annular seal. The sealing structure is simple, which is convenient for later maintenance and reduces maintenance costs.

[0020] (2) This solution sets a dust cover on the outside of the bearing cover, which, together with the double-lip oil seal skeleton inside the dust cover, greatly improves the dustproof and waterproof capabilities of the bearing protection structure. The double-lip skeleton can also work with the labyrinth oil seal to seal the lubricating grease in the sealing cavity, effectively preventing grease from overflowing. Attached Figure Description

[0021] Figure 1 A schematic diagram of the electric motor bearing protection structure provided by this utility model;

[0022] Figure 2This is a schematic diagram of the bearing protection structure at the two ends of the second labyrinth in this embodiment;

[0023] In the diagram: 1. Bearing outer cover, 2. Bearing inner cover, 3. Bearing, 4. Labyrinth oil seal, 5. Shaft, 6. Dust cover, 7. Frame, 11. Oil sealing cavity, 12. Gap groove, 41. First oil baffle end, 42. Second labyrinth end, 43. Spacer end. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0027] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They 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. Therefore, they should not be construed as limitations on this utility model.

[0028] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment provides a motor bearing protection structure, including an outer bearing cover 1 and an inner bearing cover 2 installed on both sides of the bearing housing. A bearing 3 and a labyrinth oil seal 4 are provided between the outer bearing cover 1 and the inner bearing cover 2. The labyrinth oil seal 4 is sleeved and fixed on the rotating shaft 5. The labyrinth oil seal 4 is provided with a first oil-blocking end 41 and a second labyrinth end 42. The first oil-blocking end 41 is arranged radially along the labyrinth oil seal 4, and the second labyrinth end 42 is arranged axially along the labyrinth oil seal 4. The outer bearing cover 1 is provided with an oil-sealing cavity 11 and a clearance groove 12 that is clearance-fitted with the second labyrinth end 42 on the side near the labyrinth oil seal 4. The first oil-blocking end 41 is clearance-fitted with the oil-sealing cavity 11.

[0032] A labyrinth oil seal 4 is installed in the oil sealing cavity 11 between bearing 3 and bearing outer cover 1. This, along with a clearance groove 12 on the bearing outer cover, forms a reliable labyrinth clearance based on the gap between the first oil-blocking end 41 of the labyrinth oil seal and the side wall of the oil sealing cavity 11, and the U-shaped path between the second labyrinth end 42 and the clearance groove 12. As the seal rotates with the shaft, it effectively prevents bearing lubricating grease from overflowing. The seal has high reliability, at least meeting an IP55 protection rating. Furthermore, it is achieved using only a ring-shaped seal, resulting in a simple sealing structure that is easy to install and disassemble, facilitating future maintenance and reducing maintenance costs.

[0033] In a preferred embodiment, a dust cover 6 is provided on the side of the bearing outer cover 1 away from the bearing 3. The dust cover 6 is sleeved on the rotating shaft 5 and fixed to the bearing outer cover 1. The dust cover 6 is provided with a through hole that mates with the rotating shaft 5, and the through hole is clearance-fitted with the rotating shaft 5.

[0034] Furthermore, the bearing outer cover 1 has a skeleton mounting groove on the side near the dust cover 6, and a skeleton 7 is installed in the skeleton mounting groove. The inner ring of the skeleton 7 abuts against the rotating shaft 5. In this embodiment, the skeleton 7 is a double-lip skeleton.

[0035] The dust cover 6 installed on the outside of the bearing cover, together with the double-lip skeleton inside the dust cover 6, protects against external dust and other contaminants, greatly improving the dustproof and waterproof capabilities of the bearing protection structure.

[0036] In this embodiment, the labyrinth oil seal 4 further includes a spacer end 43, which is located between the first oil-blocking end 41 and the bearing 3. The first oil-blocking end 41 has a trapezoidal axial cross-section, and its axial thickness gradually decreases along the radial direction near the sealing cavity 11. It should be understood that, under the basic condition of forming a gap with the sidewall of the sealing cavity 11, the shape of the first oil-blocking end 41 can be effectively adjusted to reduce weight and processing difficulty; for example, a rectangular axial cross-section is not required.

[0037] In this embodiment, the two axial side walls of the clearance slot 12 are respectively clearance-fitted with the two sides of the second labyrinth end 42, and the axial height of the side wall of the clearance slot 12 near the rotating shaft is greater than the axial height of the side wall away from the rotating shaft. By extending the clearance path between the second labyrinth end 42 and the clearance slot 12, while ensuring the axial contact length between the inner ring of the bearing outer cover 1 and the rotating shaft 5, the sealing effect can be further improved.

[0038] In this embodiment, the outer bearing cover 1 is mounted on the bearing housing with screws. The inner bearing cover 2 is also mounted on the bearing housing with screws. The same screw can be used to mount the outer bearing cover 1 and the inner bearing cover 2 together on the bearing housing, reducing the installation difficulty and improving the coaxiality of both with the rotating shaft.

[0039] Preferred implementation methods, such as Figure 2 As shown, there are two second labyrinth ends, each with a ring-shaped structure, and the two second labyrinth ends are coaxially distributed. By increasing the number of second labyrinth ends, the length of the labyrinth path is extended, thereby improving the sealing effect of the labyrinth oil seal. Of course, the number of second sealing ends can be adjusted according to requirements, and the length of the labyrinth path can also be adjusted by the overlap depth between the gap groove and the second labyrinth end to improve the sealing effect. The structure is quite flexible and not subject to many limitations.

[0040] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A protective structure for an electric motor bearing, comprising an outer bearing cover (1) and an inner bearing cover (2) mounted on both sides of a bearing housing, characterized in that, A bearing (3) and a labyrinth oil seal (4) are provided between the outer bearing cover (1) and the inner bearing cover (2); The labyrinth oil seal (4) is sleeved and fixed on the rotating shaft (5). The labyrinth oil seal (4) is provided with a first oil-blocking end (41) and a second labyrinth end (42). The first oil-blocking end (41) is arranged radially along the labyrinth oil seal (4), and the second labyrinth end (42) is arranged axially along the labyrinth oil seal (4). The bearing outer cover (1) is provided with an oil-sealing cavity (11) and a clearance groove (12) that is clearance-fitted with the second labyrinth end (42) on the side near the labyrinth oil seal (4). The first oil-blocking end (41) is clearance-fitted with the oil-sealing cavity (11).

2. The electric motor bearing protection structure according to claim 1, characterized in that, The bearing outer cover (1) is provided with a dust cover (6) on the side away from the bearing (3). The dust cover (6) is sleeved on the rotating shaft (5) and fixed on the bearing outer cover (1).

3. The electric motor bearing protection structure according to claim 2, characterized in that, The dust cover (6) is provided with a through hole that cooperates with the rotating shaft (5), and the through hole is clearance-fitted with the rotating shaft (5).

4. The electric motor bearing protection structure according to claim 2, characterized in that, The bearing outer cover (1) has a skeleton mounting groove on the side near the dust cover (6), and a skeleton (7) is provided in the skeleton mounting groove. The inner ring of the skeleton (7) abuts against the rotating shaft (5).

5. The electric motor bearing protection structure according to claim 4, characterized in that, The skeleton (7) is a bilip skeleton.

6. The electric motor bearing protection structure according to claim 1, characterized in that, The labyrinth oil seal (4) also includes a spacer end (43), which is located between the first oil-blocking end (41) and the bearing (3).

7. The electric motor bearing protection structure according to claim 1, characterized in that, The first oil-blocking end (41) has a trapezoidal cross-section, and the axial thickness of the first oil-blocking end (41) gradually decreases along the radial direction close to the oil-sealing cavity (11).

8. The electric motor bearing protection structure according to claim 1, characterized in that, The two axial side walls of the gap slot (12) are respectively fitted with the two sides of the second labyrinth end (42) with clearance. The axial height of the side wall of the gap slot (12) near the rotating shaft is greater than the axial height of the side wall away from the rotating shaft.

9. The electric motor bearing protection structure according to claim 1, characterized in that, Both the outer bearing cover (1) and the inner bearing cover (2) are mounted on the bearing housing by screws.

10. The electric motor bearing protection structure according to claim 1, characterized in that, There are multiple second maze ends (42), and each second maze end (42) has a ring structure and is coaxially distributed.

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