Oil seal structure

Abstract

The utility model relates to the technical field of motors, in particular to an oil seal structure, which comprises a rotating shaft, a bearing and a pressing sleeve assembly which are fixedly sleeved on the rotating shaft, and an oil seal sleeved on the pressing sleeve assembly, the pressing sleeve assembly comprises an inner pressing sleeve and an outer pressing sleeve, wherein the inner pressing sleeve is attached to the bearing in the axial direction of the rotating shaft; the outer pressing sleeve is arranged on the side, away from the bearing, of the inner pressing sleeve in the axial direction of the rotating shaft, and an oil storage cavity used for providing lubricating oil for the oil seal is defined by the outer pressing sleeve and the inner pressing sleeve. According to the invention, only a single oil seal is adopted, and compared with the arrangement of double oil seals in the prior art, the structure cost is reduced, the resistance of the rotating shaft during operation is reduced, and the operation efficiency of the motor is ensured; in addition, the space needed by a single oil seal is small, especially the requirement for the space in the axial direction of the rotating shaft is small, and therefore the application range of the oil seal is larger.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to an oil seal structure. Background Technology

[0002] Most existing motor dynamic sealing systems use a single-frame oil seal structure, see [link / reference] Figure 1 The system includes a rotating shaft 11, a front cover 91, and an oil seal 41. Lubrication and sealing are achieved through a critical oil film formed between the oil seal lip and the rotating shaft. While this structure is a mature technology, it has significant drawbacks in actual operation: when the pre-filled lubricating grease on the oil seal lip leaks or evaporates, resulting in insufficient oil volume, the oil film thickness will fall below the critical value, leading to dry friction, causing the oil seal to overheat and wear, reducing its service life, and increasing motor maintenance costs.

[0003] To address the aforementioned issues, existing technologies have proposed a dual-oil-seal assembly structure, including a rotating shaft 12, a front end cover 92, an oil seal 42, and an oil reservoir 51. This solution achieves grease replenishment by setting an oil reservoir between the two oil seals, but it also has some problems, as follows:

[0004] 1. The double oil seal structure increases the axial installation size, making it difficult to implement in compact motor designs and limiting its applicability;

[0005] 2. The double oil seal structure and the double friction surfaces increase the resistance encountered when the shaft rotates, affecting the motor's operating efficiency.

[0006] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content

[0007] The purpose of this invention is to provide an oil seal structure.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] An oil seal structure includes a rotating shaft, a bearing and a pressure sleeve assembly fixedly sleeved on the rotating shaft, and an oil seal sleeved on the pressure sleeve assembly;

[0010] The pressure sleeve assembly includes:

[0011] An inner pressure sleeve is fitted to the bearing along the axial direction of the rotating shaft;

[0012] An outer pressure sleeve is disposed along the axial direction of the rotating shaft on the side of the inner pressure sleeve away from the bearing, and together with the inner pressure sleeve, forms an oil reservoir for supplying lubricating oil to the oil seal.

[0013] In the above scheme, when the oil seal structure is running, the shaft, bearing and pressure sleeve assembly operate synchronously, while the oil seal does not move synchronously with the three. The lip of the oil seal is tightly fitted to the surface of the pressure sleeve assembly away from the shaft. The oil storage cavity inside the pressure sleeve assembly continuously provides lubricating oil to the lip of the oil seal, avoiding oil seal overheating and wear due to lack of lubricating oil at the lip, ensuring the service life of the oil seal and reducing motor maintenance costs.

[0014] This application uses only a single oil seal, which reduces structural costs compared to the double oil seal setup used in some existing technologies. It also reduces the resistance experienced by the rotating shaft during operation, ensuring the operating efficiency of the motor. In addition, a single oil seal requires less space, especially less space in the axial direction of the rotating shaft, thus making this application more applicable.

[0015] This application utilizes the conventional structure of the pressure sleeve assembly in a motor. By modifying the pressure sleeve assembly, an oil storage cavity for supplying lubricating oil to the oil seal is created without increasing the structure, thereby reducing structural costs and meeting the motor's requirements for compact internal structure.

[0016] To facilitate the processing of the oil reservoir, this application splits the pressure sleeve assembly into two parts, processes them separately, and then combines them to form the oil reservoir to store lubricating grease.

[0017] In a further technical solution, the rotating shaft is provided with an oil storage chamber for supplying lubricating oil to the oil storage cavity, and the oil storage chamber is connected to the oil storage cavity through an oil guide hole.

[0018] The oil reservoir is considered the initial oil storage space, while the oil chamber and the oil reservoir can form an expanded oil storage space with a larger capacity, which is considered an expansion of the initial oil storage space. This allows for a longer supply of lubricating oil to the oil seal, reduces the frequency of adding lubricating oil to the oil storage space, and avoids affecting the continuous operation of the shaft.

[0019] It should be emphasized that the oil storage chamber is located inside the rotating shaft, which expands the function of the rotating shaft and improves the utilization of the rotating shaft. Moreover, it does not occupy additional space outside the rotating shaft due to the expansion of the initial oil storage space. This allows the compactness requirements of the internal structure of motors and other equipment to be met when this application is used.

[0020] It should also be emphasized that since the oil reservoir can supply lubricating oil to the oil storage chamber, the oil injection hole does not need to be set on the pressure sleeve assembly, which reduces the degree and difficulty of modifying the pressure sleeve assembly.

[0021] A further technical solution is that, along the axial direction of the rotating shaft, one end of the oil storage chamber is provided with an oil delivery hole;

[0022] An oil baffle is sealed on one side of the oil reservoir along the axial direction of the rotating shaft. The oil baffle serves as a component to limit the leakage of lubricating oil from the oil reservoir through the oil inlet.

[0023] The purpose of the oil inlet is to facilitate the replenishment of lubricating oil into the oil storage chamber. To prevent the lubricating oil in the oil storage chamber from leaking out through the oil inlet, an oil baffle is installed to seal it.

[0024] This section clarifies how to replenish lubricating oil to the oil reservoir and how to prevent lubricating oil leakage, thereby expanding the oil reservoir space to stably provide lubricating oil to the oil seal.

[0025] In a further technical solution, the oil baffle plate is interference-fitted with the rotating shaft.

[0026] This section clarifies the method by which the oil baffle and the rotating shaft are fixed relative to each other, without relying on screws or other structures, and without requiring much modification to the oil baffle and the rotating shaft.

[0027] In a further technical solution, the oil storage chamber is configured as a cylindrical structure;

[0028] And / or, the oil guide hole is configured as a cylindrical structure.

[0029] This section restricts the shape of the oil reservoir and the oil guide hole. On the one hand, it reduces the difficulty of modifying the shaft; on the other hand, it reduces the resistance encountered by the lubricating oil during flow, making the lubricating oil flow easier.

[0030] In a further technical solution, the oil storage cavity is configured as a circular ring structure;

[0031] And / or, the oil guide holes are provided in a plurality of manner, and each of the oil guide holes is circumferentially distributed around the axis of the rotating shaft.

[0032] This section restricts the shape of the oil reservoir. The annular structure allows the oil reservoir to hold more lubricating oil, further reducing the frequency of adding lubricating oil and further avoiding affecting the continuous operation of the shaft. In addition, it also facilitates the expansion of the number of oil guide holes.

[0033] This section increases the number of oil guide holes, thereby increasing the number of channels for transferring lubricating oil from the oil reservoir to the oil storage chamber. This increases the speed at which lubricating oil is replenished to the oil storage chamber, ensuring a stable supply of lubricating oil to the oil seal and meeting the needs of continuous operation of the oil seal.

[0034] In a further technical solution, the length direction of the oil storage chamber is consistent with the length direction of the rotating shaft.

[0035] This section restricts the length of the oil reservoir, which on the one hand reduces the difficulty of machining the oil reservoir; on the other hand, it allows the oil reservoir to hold more lubricating oil, further reducing the frequency of adding lubricating oil and further avoiding affecting the continuous operation of the shaft; and on the other hand, it further improves the utilization of the shaft.

[0036] In a further technical solution, the length direction of the oil guide hole is perpendicular to the length direction of the rotating shaft.

[0037] This section restricts the length direction of the oil guide hole, which on the one hand reduces the difficulty of machining the oil guide hole; on the other hand, it further reduces the resistance encountered by the lubricating oil when it is transferred through the oil guide hole; and further reduces the movement path of the lubricating oil when it moves through the oil guide hole, thus ensuring the rapid transfer of the lubricating oil.

[0038] In a further technical solution, along the radial direction of the rotating shaft, the extension dimension of the oil reservoir is greater than the extension dimension of the oil guide hole.

[0039] One purpose of this section is to further ensure that the oil reservoir can hold more lubricating oil, thereby further reducing the frequency of adding lubricating oil; another purpose of this section is to further ensure that the path of lubricating oil transfer within the oil guide hole is shorter, thereby further ensuring rapid transfer of lubricating oil.

[0040] A further technical solution also includes a front end cover, wherein the rotating shaft is mounted on the front end cover via the bearing.

[0041] This section clarifies one scenario for shaft installation.

[0042] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.

[0043] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0044] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0045] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0046] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.

[0047] The working principle and advantages of this utility model are as follows:

[0048] When the oil seal structure is in operation, the shaft, bearing and pressure sleeve assembly move synchronously, while the oil seal does not move synchronously with the three. The lip of the oil seal is tightly fitted to the surface of the pressure sleeve assembly away from the shaft. The oil storage chamber inside the pressure sleeve assembly continuously provides lubricating oil to the lip of the oil seal, avoiding overheating and wear of the oil seal due to lack of lubricating oil at the lip, ensuring the service life of the oil seal and reducing motor maintenance costs.

[0049] This application uses only a single oil seal, which reduces structural costs compared to the double oil seal setup used in some existing technologies. It also reduces the resistance experienced by the rotating shaft during operation, ensuring the operating efficiency of the motor. In addition, a single oil seal requires less space, especially less space in the axial direction of the rotating shaft, thus making this application more applicable.

[0050] This application utilizes the conventional structure of the pressure sleeve assembly in a motor. By modifying the pressure sleeve assembly, an oil storage cavity for supplying lubricating oil to the oil seal is created without increasing the structure, thereby reducing structural costs and meeting the motor's requirements for compact internal structure. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of a single-frame oil seal structure in the prior art;

[0052] Figure 2 This is a schematic diagram of the existing double oil seal combination structure;

[0053] Figure 3 This is a schematic diagram of the oil seal structure according to one embodiment of the present invention;

[0054] Figure 4 This is a schematic diagram of the pressure sleeve assembly according to an embodiment of the present utility model;

[0055] Figure 5 for Figure 4 A cross-sectional view of the middle structure along line AA;

[0056] Figure 6 This is a schematic diagram of the oil seal structure under another embodiment of the present utility model.

[0057] In the above attached diagram: 1. Shaft; 2. Bearing; 3. Pressure sleeve assembly; 31. Inner pressure sleeve; 32. Outer pressure sleeve; 4. Oil seal; 5. Oil reservoir; 6. Oil reservoir chamber; 7. Oil guide hole; 8. Oil baffle plate; 9. Front end cover; 10. Front end cover plate; 11. Transmission flange. Detailed Implementation

[0058] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0059] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0060] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0061] See Figures 1-6 An oil seal structure includes a rotating shaft 1, a bearing 2 and a pressure sleeve assembly 3 fixedly sleeved on the rotating shaft 1, and an oil seal 4 sleeved on the pressure sleeve assembly 3;

[0062] The pressure sleeve assembly 3 includes:

[0063] The inner pressure sleeve 31 is attached to the bearing 2 along the axial direction of the rotating shaft 1;

[0064] The outer pressure sleeve 32 is arranged along the axial direction of the rotating shaft 1 on the side of the inner pressure sleeve 31 away from the bearing 2, and together with the inner pressure sleeve 31, forms an oil storage cavity 5 for providing lubricating oil (or lubricating grease or grease) to the oil seal 4.

[0065] This application describes the use of an oil seal structure in an electric motor, but is not limited to its application in electric motors.

[0066] Bearing 2 is an existing configuration, and its specific purpose will not be explained here.

[0067] The pressure sleeve assembly 3 serves to fix the position of the bearing 2, and is actually a bearing pressure sleeve. For specific uses, refer to existing ones.

[0068] When the oil seal structure is in operation, the rotating shaft 1, bearing 2 and pressure sleeve assembly 3 operate synchronously, while the oil seal 4 does not move synchronously with the three. The lip of the oil seal 4 is tightly fitted to the surface of the pressure sleeve assembly 3 away from the rotating shaft 1. The oil storage cavity 5 inside the pressure sleeve assembly 3 continuously provides lubricating oil to the lip of the oil seal 4, avoiding the oil seal 4 from overheating and wear due to lack of lubricating oil at the lip of the oil seal 4, ensuring the service life of the oil seal 4 and reducing motor maintenance costs.

[0069] This application uses only a single oil seal 4, which reduces structural costs compared to the double oil seal setup used in some existing technologies. It also reduces the resistance experienced by the rotating shaft 1 during operation, ensuring the operating efficiency of the motor. In addition, the space required by a single oil seal 4 is smaller, especially the space required for the axial direction of the rotating shaft 1. Therefore, this application has a wider range of applications.

[0070] This application utilizes the conventional structure of the pressure sleeve assembly 3 in the motor. By modifying the pressure sleeve assembly 3, an oil storage cavity 5 for supplying lubricating oil to the oil seal 4 is opened without increasing the structure, thereby reducing structural costs and meeting the motor's requirements for the compactness of the internal structure.

[0071] To facilitate the processing of the oil storage cavity 5, this application splits the pressure sleeve assembly 3 into two parts, processes them separately, and then combines them to form the oil storage cavity 5 to store lubricating grease.

[0072] When the motor is running, the pressure sleeve assembly 3 uses the centrifugal force generated by the rotation of the rotating shaft 1 to throw the lubricating grease in the oil storage chamber 5 to the lip of the oil seal 4, so as to automatically replenish the lubricating grease. The specific transfer process is the same as that in the prior art.

[0073] The centrifugal force generated when the motor is running will shake the stored grease. At low speeds, the centrifugal force is small, and the lip of the oil seal 4 fits tightly with the pressure sleeve assembly 3, resulting in high sealing performance. At high speeds, the grease slightly lifts the oil seal 4, reducing the radial pressure on the lip of the oil seal 4, increasing the oil film thickness, improving lubrication performance, and reducing wear on the oil seal 4.

[0074] Holes can be made on the inner pressure sleeve 31 or the outer pressure sleeve 32 for oil transportation. This is a standard feature and will not be explained in detail here.

[0075] It should be noted that in some existing technologies, the lip of the oil seal 4 is in contact with the surface of the rotating shaft 1. In this application, since the rotating shaft 1 and the pressure sleeve assembly 3 operate synchronously, the setting of the lip of the oil seal 4 being in contact with the pressure sleeve assembly 3 can also enable the oil seal 4 to perform its function.

[0076] It should also be noted that the specific connection methods between the structures are existing settings, such as the connection method between shaft 1 and bearing 2, which will not be described in detail here; the support of the structures is also existing settings, such as the support for oil seal 4.

[0077] See Figure 6 In this embodiment, the rotating shaft 1 is provided with an oil storage chamber 6 for providing lubricating oil to the oil storage cavity 5, and the oil storage chamber 6 is connected to the oil storage cavity 5 through an oil guide hole 7.

[0078] Oil reservoir 5 is considered as the initial oil storage space, while oil reservoir 6 and oil reservoir 5 can form an expanded oil storage space with a larger capacity, which is considered as an expansion of the initial oil storage space. This allows for a longer supply of lubricating oil to oil seal 4, reduces the frequency of adding lubricating oil to the oil storage space, and avoids affecting the continuous operation of shaft 1.

[0079] It should be emphasized that the oil storage chamber 6 is located inside the rotating shaft 1, which expands the function of the rotating shaft 1 and improves the utilization of the rotating shaft 1. Moreover, it does not occupy additional space outside the rotating shaft 1 due to the expansion of the initial oil storage space. This allows the compactness requirements of the internal structure of the motor and other equipment to be met when this application is used in motors and other equipment.

[0080] It should also be emphasized that since the oil reservoir 6 can supply lubricating oil to the oil reservoir 5, the pressure sleeve assembly 3 does not need to be provided with an oil injection hole, thus reducing the degree and difficulty of modification to the pressure sleeve assembly 3. Of course, this embodiment is not limited to providing an oil injection hole on the pressure sleeve assembly 3.

[0081] The lubricating oil is readily available and will not be described in detail here.

[0082] In this embodiment, along the axial direction of the rotating shaft 1, one end of the oil storage chamber 6 is provided with an oil delivery hole;

[0083] See Figure 6 An oil baffle 8 is sealed and fitted on one side of the oil storage chamber 6 along the axial direction of the rotating shaft 1. The oil baffle 8 serves as a component to limit the leakage of lubricating oil in the oil storage chamber 6 through the oil inlet.

[0084] For the specific location of the oil baffle 8, please refer to the attached document. Figure 6 .

[0085] The purpose of opening the oil supply hole is to facilitate the replenishment of lubricating oil into the oil storage chamber 6. In order to prevent the lubricating oil in the oil storage chamber 6 from leaking out through the oil supply hole, an oil baffle plate 8 is installed to block it.

[0086] This embodiment clarifies how to replenish lubricating oil to the oil storage chamber 6 and how to prevent lubricating oil leakage, thereby expanding the oil storage space to stably provide lubricating oil to the oil seal 4.

[0087] In some embodiments, a groove-shaped structure is provided at the end of the rotating shaft 1 along the axial direction of the rotating shaft 1. The internal space of the groove-shaped structure is regarded as the oil storage chamber 6, and the opening of the groove-shaped structure is regarded as the oil delivery hole.

[0088] See Figure 6 In this embodiment, the oil baffle 8 is interference-fitted with the rotating shaft 1.

[0089] The interference fit method is existing technology and will not be explained in detail here.

[0090] This embodiment clearly defines the method by which the oil baffle 8 and the rotating shaft 1 are fixed relative to each other, without relying on screws or other structures, and without requiring much modification to the oil baffle 8 and the rotating shaft 1.

[0091] In some embodiments, along the axial direction of the shaft 1, the end of the shaft 1 is provided with an opening for accommodating the oil baffle 8.

[0092] In some embodiments, the edge of the oil baffle 8 is elastic, for example, the edge is made of a material such as rubber.

[0093] In this embodiment, the oil storage chamber 6 is configured as a cylindrical structure;

[0094] And / or, the oil guide hole 7 is configured as a cylindrical structure.

[0095] In other embodiments, the oil reservoir 6 and the oil guide hole 7 may be configured in other shapes.

[0096] This embodiment restricts the shape of the oil reservoir 6 and the oil guide hole 7. On the one hand, it reduces the difficulty of modifying the rotating shaft 1; on the other hand, it reduces the resistance encountered by the lubricating oil during flow, making the lubricating oil flow easier.

[0097] See Figure 4 , Figure 5 In this embodiment, the oil storage cavity 5 is configured as a circular ring structure;

[0098] And / or, the oil guide holes 7 are provided in multiples, and each of the oil guide holes 7 is circumferentially distributed around the axis of the rotating shaft 1.

[0099] In some embodiments, each oil guide hole 7 is uniformly distributed in a circular pattern around the axis of the rotating shaft 1.

[0100] In some embodiments, four oil guide holes 7 are provided.

[0101] This embodiment restricts the shape of the oil reservoir 5. The circular structure allows the oil reservoir 5 to hold more lubricating oil, further reducing the frequency of adding lubricating oil and further avoiding affecting the continuous operation of the rotating shaft 1. In addition, it also facilitates the expansion of the number of oil guide holes 7.

[0102] This embodiment increases the number of oil guide holes 7, thereby increasing the number of channels for transferring lubricating oil from the oil reservoir 6 to the oil reservoir 5, thus increasing the speed at which lubricating oil is replenished to the oil reservoir 5, achieving a stable supply of lubricating oil to the oil seal 4, and meeting the needs of continuous operation of the oil seal 4.

[0103] See Figure 6 In this embodiment, the length direction of the oil storage chamber 6 is consistent with the length direction of the rotating shaft 1.

[0104] This embodiment restricts the length of the oil reservoir 6, which on the one hand reduces the difficulty of machining the oil reservoir 6; on the other hand, it allows the oil reservoir 6 to hold more lubricating oil, further reducing the frequency of adding lubricating oil and further avoiding affecting the continuous operation of the rotating shaft 1; and on the other hand, it further improves the utilization of the rotating shaft 1.

[0105] See Figure 6 In this embodiment, the length direction of the oil guide hole 7 is perpendicular to the length direction of the rotating shaft 1.

[0106] This embodiment restricts the length direction of the oil guide hole 7, which on the one hand reduces the difficulty of machining the oil guide hole 7; on the other hand, it further reduces the resistance encountered by the lubricating oil when it transfers through the oil guide hole 7; and further reduces the movement path of the lubricating oil when it moves through the oil guide hole 7, thus ensuring the rapid transfer of the lubricating oil.

[0107] In this embodiment, along the radial direction of the rotating shaft 1, the extension dimension of the oil reservoir 6 is greater than the extension dimension of the oil guide hole 7.

[0108] For ease of understanding, this embodiment describes the oil storage chamber 6 and the oil guide hole 7 as cylindrical structures, with the length direction of the oil storage chamber 6 consistent with the length direction of the rotating shaft 1, and the length direction of the oil guide hole 7 perpendicular to the length direction of the rotating shaft 1.

[0109] Along the radial direction of the rotating shaft 1, the extension dimension of the oil reservoir 6 is greater than the extension dimension of the oil guide hole 7. At this time, the cross-sectional radius of the oil reservoir 6 can be regarded as 10 (units are not considered), and the length of the oil guide hole 7 is 5. The oil guide hole 7 can be regarded as having two. At this time, the sum of the lengths of the two oil guide holes 7 is 10.

[0110] One purpose of this embodiment is to further ensure that the oil reservoir 6 can hold more lubricating oil, thereby further reducing the frequency of adding lubricating oil; another purpose of this embodiment is to further ensure that the path of lubricating oil transfer within the oil guide hole 7 is shorter, thereby further ensuring rapid transfer of lubricating oil.

[0111] It should be noted that this embodiment is not specifically limited to the ratio of the extension dimension of the oil reservoir 6 to the extension dimension of the oil guide hole 7 in the radial direction of the rotating shaft 1, and can be adjusted according to specific needs.

[0112] See Figure 6 In this embodiment, a front end cover 9 is also included, and the rotating shaft 1 is mounted on the front end cover 9 via the bearing 2.

[0113] The explanation will focus on the application of shaft 1 to the motor. The front cover 9 is a conventional structure in the motor and will not be explained in detail here.

[0114] This embodiment clarifies one case of shaft 1 installation.

[0115] See Figure 6 In some embodiments, the device further includes a front cover plate 10 and a transmission flange 11. The front cover plate 10 is mounted on the front cover 9, the transmission flange 11 is mounted on the rotating shaft 1, and the oil seal 4 is disposed between the front cover plate 10 and the pressure sleeve assembly 3. The front cover plate 10 and the transmission flange 11 are conventional structures in motors.

[0116] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An oil seal structure, characterized in that: It includes a rotating shaft (1), a bearing (2) fixedly sleeved on the rotating shaft (1) and a pressure sleeve assembly (3), and an oil seal (4) sleeved on the pressure sleeve assembly (3). The pressure sleeve assembly (3) includes: The inner pressure sleeve (31) is attached to the bearing (2) along the axial direction of the rotating shaft (1). An outer pressure sleeve (32) is disposed along the axial direction of the rotating shaft (1) on the side of the inner pressure sleeve (31) away from the bearing (2), and together with the inner pressure sleeve (31) forms an oil reservoir (5) for providing lubricating oil to the oil seal (4).

2. The oil seal structure according to claim 1, characterized in that: The rotating shaft (1) is provided with an oil storage chamber (6) for supplying lubricating oil to the oil storage cavity (5), and the oil storage chamber (6) is connected to the oil storage cavity (5) through an oil guide hole (7).

3. The oil seal structure according to claim 2, characterized in that: Along the axial direction of the rotating shaft (1), one end of the oil storage chamber (6) is provided with an oil delivery hole; The oil reservoir (6) is sealed with an oil baffle (8) on one side along the axial direction of the rotating shaft (1). The oil baffle (8) serves as a component to restrict the leakage of lubricating oil in the oil reservoir (6) through the oil outlet.

4. The oil seal structure according to claim 3, characterized in that: The oil baffle (8) is interference-fitted with the rotating shaft (1).

5. The oil seal structure according to claim 2, characterized in that: The oil storage chamber (6) is configured as a cylindrical structure; And / or, the oil guide hole (7) is configured as a cylindrical structure.

6. The oil seal structure according to claim 2, characterized in that: The oil storage cavity (5) is configured as a circular structure; And / or, the oil guide hole (7) is provided as a plurality of them, and each of the oil guide holes (7) is circumferentially distributed around the axis of the rotating shaft (1).

7. The oil seal structure according to claim 2, characterized in that: The length direction of the oil storage chamber (6) is consistent with the length direction of the rotating shaft (1).

8. The oil seal structure according to claim 2, characterized in that: The length direction of the oil guide hole (7) is perpendicular to the length direction of the rotating shaft (1).

9. An oil seal structure according to claim 2, characterized in that: Along the radial direction of the rotating shaft (1), the extension dimension of the oil reservoir (6) is greater than the extension dimension of the oil guide hole (7).

10. An oil seal structure according to any one of claims 1-9, characterized in that: It also includes a front cover (9), and the rotating shaft (1) is mounted on the front cover (9) via the bearing (2).

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