Bearing grease leakage-proof structure and motor

Abstract

The utility model discloses a bearing grease leakage-proof structure and a motor. The bearing grease leakage-proof structure comprises a motor end cover, a main shaft, a bearing and a sealing assembly. A mounting hole is formed in the motor end cover; the main shaft is sleeved with a bearing, and the main shaft is rotatably mounted in the mounting hole through the bearing; the sealing assembly comprises a bearing sealing outer cover and a stop piece, the bearing sealing outer cover is arranged on the first side of the motor end cover and covers the mounting hole, the stop piece is arranged on the main shaft in a sleeving mode and located on the side, away from the bearing sealing outer cover, of the bearing, and the stop piece is located in the mounting hole. The problem that in the prior art, bearing lubricating grease is prone to leakage in the high-speed operation process of a motor can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of motor bearing sealing, and in particular to a bearing grease leakage prevention structure and a motor. Background Art

[0002] Motor end covers are usually provided at both ends of the motor. Depending on the special working conditions, if a closed bearing is provided on the motor end cover, the bearing grease provided by the closed bearing cannot meet the high temperature requirements. Therefore, an open bearing needs to be provided on the motor end cover. The inner and outer sides of the open bearing are closed with bearing covers. The motor end cover and the bearing outer cover are provided with oil filling holes and oil drain holes for filling grease into the open bearing. A certain sealed oil storage cavity structure needs to be formed between the inner and outer sides of the bearing. The bearing relies on the grease in the sealed oil storage cavity to maintain lubrication.

[0003] At present, the motor adopts a fully sealed structure of lubricating grease, which has the defects of using too many parts, complex structure, inconvenient installation and high cost. When the motor adopts a semi-sealed structure of lubricating grease, the lubricating grease on the inside of the bearing is sealed by the bearing inner cover. Although the bearing inner cover is machined with an oil groove, there is no seal on the bearing inner cover, which easily leads to a gap between the bearing inner cover and the motor shaft, thereby posing a greater risk of grease leakage. Utility Model Content

[0004] The main purpose of the present application is to provide a bearing grease leakage prevention structure and a motor, so as to solve the problem of easy leakage of bearing lubricating grease during high-speed operation of the motor in the prior art.

[0005] According to one aspect of the present application, a bearing grease leakage prevention structure is provided, comprising:

[0006] A motor end cover, wherein the motor end cover is provided with a mounting hole;

[0007] A main shaft, wherein a bearing is sleeved on the main shaft, and the main shaft is rotatably mounted in the mounting hole through the bearing;

[0008] A sealing assembly, the sealing assembly comprising a bearing sealing cover and a stopper, the bearing sealing cover being arranged on a first side of the motor end cover and covering the mounting hole, the stopper being sleeved on the main shaft and being located on a side of the bearing away from the bearing sealing cover, and the stopper being located in the mounting hole.

[0009] Furthermore, there is a predetermined gap between the inner wall surface of the mounting hole and the outer peripheral surface of the stopper.

[0010] Furthermore, the width of the predetermined gap along the radial direction of the main shaft is 0.5 mm to 1.5 mm.

[0011] Furthermore, an oil groove is provided on the inner wall surface of the mounting hole and / or the outer peripheral surface of the stopper.

[0012] Furthermore, the oil groove comprises an annular groove, and the annular groove is coaxially arranged with the main shaft.

[0013] Further, the oil grooves include a plurality of oil grooves, and the plurality of oil grooves are arranged at intervals along the axial direction of the main shaft on the inner wall surface of the mounting hole and / or the outer peripheral surface of the stopper.

[0014] Furthermore, there are 2 to 3 oil tanks.

[0015] Furthermore, the stopper and the main shaft are fixedly connected by means of interference fit.

[0016] On the other hand, the present application also provides a motor, which includes the above-mentioned bearing grease leakage prevention structure.

[0017] In the present application, when the motor is actually processed, a mounting hole can be set on the motor end cover, and then the bearing sleeve is set on the main shaft, so that the main shaft can be rotatably mounted in the mounting hole through the bearing, and then the bearing sealing cover is installed on the first side of the motor end cover to cover the mounting hole to protect the bearing. At the same time, the stopper is sleeved on the main shaft. At this time, the stopper is located on the side of the bearing away from the bearing sealing cover and is located in the mounting hole. In this way, when the motor starts to run at high speed, the lubricating grease will not leak from the bearing to the inner cavity of the motor under the action of the stopper, which prolongs the service life of the bearing and improves the safety performance of the motor to a certain extent. Compared with the structure in the prior art where no sealing member is set on the bearing, the present application is provided with a main shaft, a bearing and a stopper in the mounting hole. By sleeve-mounting the bearing and the stopper on the main shaft, and installing the stopper on the side of the bearing away from the bearing sealing cover, the lubricating grease on the bearing can be sealed, and the sealing effect is good, which effectively prevents the grease from leaking into the motor, thereby prolonging the service life of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 A partial cross-sectional view of the motor end cover and the bearing matching position of a motor disclosed in an embodiment of the present application;

[0020] Figure 2 The attached embodiment disclosed in this application Figure 1 A partial enlarged schematic diagram of the structure A in the middle.

[0021] The above drawings include the following reference numerals:

[0022] 10. Motor end cover; 111. First side; 11. Mounting hole; 20. Main shaft; 30. Bearing; 40. Sealing assembly; 41. Bearing sealing cover; 42. Stopper; 50. Oil groove; 60. Sealing ring; 70. Predetermined gap. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0026] As mentioned in the background technology, when the existing motor adopts a semi-sealed structure of lubricating grease, the lubricating grease on the inner side of the bearing is usually sealed by the inner cover of the bearing, but since there is no seal on the inner cover of the bearing, there is a gap between the inner cover of the bearing and the motor shaft, which causes the lubricating grease to leak from the gap. Therefore, in order to prevent the bearing lubricating grease from leaking during the high-speed operation of the motor, the inventor of the present application has designed a new type of bearing grease leakage prevention structure, and the bearing grease leakage prevention structure of the present application will be described in detail below.

[0027] See also Figure 1 to Figure 2As shown, the present application provides a bearing grease leakage prevention structure, which includes a motor end cover 10, a main shaft 20, a bearing 30 and a sealing assembly 40.

[0028] Among them, a mounting hole 11 is provided on the motor end cover 10; a bearing 30 is sleeved on the main shaft 20, and the main shaft 20 is rotatably mounted in the mounting hole 11 through the bearing 30; the sealing assembly 40 includes a bearing sealing outer cover 41 and a stopper 42, the bearing sealing outer cover 41 is arranged on the first side 111 of the motor end cover 10 and covers the mounting hole 11, the stopper 42 is sleeved on the main shaft 20 and is located on the side of the bearing 30 away from the bearing sealing outer cover 41, and the stopper 42 is located in the mounting hole 11.

[0029] In this embodiment, the sealing assembly 40 includes a bearing sealing cover 41 and a stopper 42. When the motor is actually processed, a mounting hole 11 can be set on the motor end cover 10, and then the bearing 30 is sleeved on the main shaft 20, so that the main shaft 20 is rotatably mounted in the mounting hole 11 through the bearing 30, and then the bearing sealing cover 41 is installed on the first side 111 of the motor end cover 10 to cover the mounting hole 11 to protect the bearing 30. At the same time, the stopper 42 is sleeved on the main shaft 20. At this time, the stopper 42 is located on the side of the bearing 30 away from the bearing sealing cover 41 and is located in the mounting hole 11. In this way, when the motor starts to run at high speed, the lubricating grease will not leak from the bearing 30 to the inner cavity of the motor under the action of the stopper 42, which prolongs the service life of the bearing 30 to a certain extent and improves the safety performance of the motor.

[0030] That is to say, compared with the structure in the prior art in which no seal is set on the bearing, in this embodiment, a main shaft 20, a bearing 30 and a stopper 42 are set in the mounting hole 11. By sleeved the bearing 30 and the stopper 42 on the main shaft 20, and installing the stopper 42 on the side of the bearing 30 away from the bearing sealing outer cover 41, the lubricating grease on the bearing 30 can be sealed, and the sealing effect is good, which can effectively prevent grease from leaking into the interior of the motor, thereby extending the service life of the bearing 30.

[0031] Further, see Figure 2As shown, in this embodiment, there is a predetermined gap 70 between the inner wall surface of the mounting hole 11 and the outer peripheral surface of the stopper 42. Since the bearing 30 and the stopper 42 are both sleeved on the main shaft 20 and are both located in the mounting hole 11, and the stopper 42 is located on the side of the bearing 30 away from the bearing sealing outer cover 41, when the motor starts to work, the main shaft 20 will rotate, thereby driving the bearing 30 and the stopper 42 to rotate together. In this process, the stopper 42 directly contacts the inner wall surface of the mounting hole 11, generating friction. If the motor is in a working state for a long time, it is easy to cause the stopper 42 to wear. Therefore, in this embodiment, a predetermined gap 70 is set between the inner wall surface of the mounting hole 11 and the outer peripheral surface of the stopper 42. The existence of the predetermined gap 70 avoids damage to the stopper 42 due to friction to a certain extent, and provides a rotation space for the stopper 42 to rotate on the main shaft 20.

[0032] Further, in this embodiment, the width of the predetermined gap 70 along the radial direction of the main shaft 20 is 0.5 mm to 1.5 mm, for example, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, or 1.5 mm. Along the radial direction of the main shaft 20, when the width of the predetermined gap 70 is less than 0.5 mm, the too small gap easily causes the outer peripheral surface of the stopper 42 to contact the inner wall surface of the mounting hole 11, increasing the friction area between the stopper 42 and the mounting hole 11. In this way, if the motor works for a long time, it is easy to damage the stopper 42; when the width of the predetermined gap 70 is greater than 1.5 mm, the excessive gap will affect the limiting ability of the mounting hole 11 to the stopper 42. Although the stopper 42 is sleeved on the main shaft 20, the motor is in a high-speed and high-temperature state during operation. At this time, if the width of the predetermined gap 70 is too large, the rotating stopper 42 will be deflected to a certain extent, thereby reducing the sealing ability of the stopper 42 to the lubricating grease in the bearing 30, and then reducing the service life of the bearing 30. Therefore, in this embodiment, the width of the predetermined gap 70 along the radial direction of the main shaft 20 is set to 0.5 mm to 1.5 mm, which effectively enhances the sealing effect of the stopper 42 on the lubricating grease, thereby extending the service life of the bearing 30 to a certain extent.

[0033] Furthermore, in this embodiment, an oil groove 50 is provided on the inner wall surface of the mounting hole 11 and / or the outer peripheral surface of the stopper 42. That is to say, the provision of the oil groove 50 may include the following two situations: (1) in this embodiment, the oil groove 50 is provided on both the inner wall surface of the mounting hole 11 and the outer peripheral surface of the stopper 42; (2) in this embodiment, the oil groove 50 is provided on one of the inner wall surface of the mounting hole 11 or the outer peripheral surface of the stopper 42 (this embodiment has shown that the oil groove 50 is provided on the outer peripheral surface of the stopper 42). Since the stopper 42 is sleeved on the main shaft 20 and is located on the side of the bearing 30 away from the bearing sealing outer cover 41, when the motor runs at high speed, the main shaft 20 and the bearing 30 will generate heat, and the lubricating grease in the oil groove will become thinner after being thrown out of the oil groove due to the rotation of the motor. Therefore, when an oil groove 50 is provided on the inner wall surface of the mounting hole 11, the oil groove 50 moves from the end close to the main shaft 20 to the motor end cover 10. At this time, the oil groove 50 is away from the high temperature position and is located on the inner wall surface of the mounting hole 11 where the temperature is relatively low, which improves the oil groove 50's ability to retain lubricating grease to a certain extent; when an oil groove 50 is provided on the outer peripheral surface of the stopper 42, the oil groove 50's ability to retain lubricating grease can also be improved. In addition, the gap left between the stopper 42 and the oil groove 50 is small, which can improve the sealing ability of the stopper 42 to the oil groove 50, and then to a certain extent ensure that the lubricating grease in the oil groove 50 can be retained for a long time without leaking into the inner cavity of the casing.

[0034] Specifically, in this embodiment, the oil groove 50 includes an annular groove, which is coaxially arranged with the main shaft 20. The annular groove surrounds the inner wall surface of the mounting hole 11 and / or the outer peripheral surface of the stopper 42 along the circumferential surface of the stopper 42. In this way, during the operation of the motor, the lubricating grease will be thrown out in a direction away from the main shaft 20 under high-speed rotation. At this time, the existence of the annular groove can collect the thrown lubricating grease, which increases the storage capacity of the lubricating grease in the oil groove 50 to a certain extent, thereby effectively improving the sealing effect of the lubricating grease retention at the oil groove 50.

[0035] Furthermore, in this embodiment, the oil groove 50 includes a plurality of oil grooves 50, which are arranged at intervals along the axial direction of the main shaft 20 on the inner wall surface of the mounting hole 11 and / or the outer peripheral surface of the stopper 42. In this way, the storage amount of lubricating grease in the oil groove 50 can be further increased, thereby ensuring the sealing effect of the lubricating grease retention in the oil groove 50, thereby preventing the lubricating grease from leaking into the housing when the motor runs at high speed, thereby extending the service life of the motor.

[0036] Specifically, in this embodiment, there are 2 to 3 oil grooves 50. Figure 1As shown, in this embodiment, three oil grooves are arranged on the outer peripheral surface of the stopper 42. Such arrangement can improve the retention and sealing effect of the lubricating grease in the oil groove 50, and can meet the lubricating grease required by the bearing 30 when running at high temperature and high speed. The structure is simple and easy to implement.

[0037] Furthermore, in this embodiment, the stopper 42 is fixedly connected to the main shaft 20 by means of interference fit. The purpose of this connection method is to firmly fix the stopper 42 on the main shaft 20 to prevent the stopper 42 from falling off the main shaft 20 and sliding on the main shaft 20 when the motor is running at high speed, thereby improving the stopping effect of the stopper 42 on the lubricating grease, thereby preventing the leakage of the lubricating grease, and then ensuring that the lubricating grease fully lubricates the surface of the bearing 30, and finally prolonging the service life of the bearing 30. Therefore, the stopper 42 of this embodiment is fixedly connected to the main shaft 20 by means of interference fit.

[0038] Furthermore, the bearing 30 in this embodiment is fixedly connected to the main shaft 20 by means of interference fit. In this embodiment, the inner ring of the bearing 30 is fixed to the main shaft 20 by means of shrink fit (i.e., interference fit), and the outer ring of the bearing 30 is fixed to the motor end cover 10. Such an arrangement can prevent the bearing 30 from falling off the main shaft 20 and sliding on the main shaft 20 during the high-speed operation of the motor, thereby preventing the contact surface of the bearing 30 and the main shaft 20 from being worn, thereby ensuring that the bearing 30 plays a full role on the main shaft 20. Therefore, the bearing 30 in this embodiment is fixedly connected to the main shaft 20 by means of interference fit.

[0039] Furthermore, in this embodiment, the bearing 30 is an open bearing, and a sealing ring 60 is provided between the outer wall surface of the bearing 30 and the inner wall surface of the mounting hole 11. Compared with the motor adopting a fully sealed structure, the bearing 30 in this embodiment is an open bearing, which reduces the number of parts used in the motor to a certain extent, has a simple structure, is easy to install, and has a low manufacturing cost. The presence of the sealing ring 60 can keep the lubricating grease inside the bearing 30 from being lost when the bearing 30 rotates, and the unclean lubricating grease outside is not easy to flow in, so as to ensure that the bearing 30 is in a lubricated state. In addition, the sealing ring 60 can also protect the dust or harmful gas outside the bearing 30 from entering the inner cavity of the bearing 30, effectively preventing the bearing 30 from being damaged.

[0040] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: Compared with the structure in the prior art where no seal is provided on the bearing, the newly added stopper of the present application makes up for the deficiency that the lubricating grease is easy to leak during the high-speed operation of the motor. The existence of the stopper can ensure that the lubricating grease on the bearing will not leak from the bearing into the housing under high-speed and high-temperature conditions, thereby ensuring that the lubricating grease can fully lubricate the surface of the bearing, prolonging the service life of the bearing to a certain extent, and improving the safety performance of the motor.

[0041] On the other hand, the embodiment of the present application further provides a motor, which includes the above-mentioned bearing grease leakage prevention structure, and thus the motor includes all the technical effects of the above-mentioned bearing grease leakage prevention structure. Since the technical effects of the bearing grease leakage prevention structure have been described in detail above, they will not be repeated here.

[0042] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0043] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0044] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bearing grease leakage prevention structure, characterized in that: include: A motor end cover (10), wherein the motor end cover (10) is provided with a mounting hole (11); A main shaft (20), wherein a bearing (30) is sleeved on the main shaft (20), and the main shaft (20) is rotatably mounted in the mounting hole (11) via the bearing (30); A sealing assembly (40), the sealing assembly (40) comprising a bearing sealing outer cover (41) and a stopper (42), the bearing sealing outer cover (41) being arranged on a first side (111) of the motor end cover (10) and covering the mounting hole (11), the stopper (42) being sleeved on the main shaft (20) and being located on a side of the bearing (30) away from the bearing sealing outer cover (41), and the stopper (42) being located in the mounting hole (11).

2. The bearing grease leakage prevention structure according to claim 1, characterized in that: A predetermined gap (70) is provided between the inner wall surface of the mounting hole (11) and the outer peripheral surface of the stopper (42).

3. The bearing grease leakage prevention structure according to claim 2, characterized in that: The width of the predetermined gap (70) along the radial direction of the main shaft (20) is 0.5 mm to 1.5 mm.

4. The bearing grease leakage prevention structure according to claim 1, characterized in that: An oil groove (50) is provided on the inner wall surface of the mounting hole (11) and / or the outer peripheral surface of the stopper (42).

5. The bearing grease leakage prevention structure according to claim 4, characterized in that: The oil groove (50) comprises an annular groove, and the annular groove is coaxially arranged with the main shaft (20).

6. The bearing grease leakage prevention structure according to claim 4, characterized in that: The oil grooves (50) include a plurality of oil grooves (50), which are arranged at intervals along the axial direction of the main shaft (20) on the inner wall surface of the mounting hole (11) and / or the outer peripheral surface of the stopper (42).

7. The bearing grease leakage prevention structure according to claim 4, characterized in that: There are 2 to 3 oil grooves (50).

8. The bearing grease leakage prevention structure according to any one of claims 1 to 7, characterized in that: The stopper (42) and the main shaft (20) are fixedly connected by means of interference fit.

9. A motor, comprising the bearing grease leakage prevention structure according to any one of claims 1 to 8.

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