An oil seal and motor

Abstract

The utility model provides an oil seal and motor relates to oil seal technical field. The oil hole on shell and the oil injection hole on motor intercommunication, thereby form lubricating oil circuit. The shell is equipped with the installation ring groove, and multiple sealing lips are installed in the installation ring groove respectively, and each sealing lip has the inclined section arranged with the motor shaft in the preset angle, and multiple inclined sections form the sealed cavity in communication with the lubricating oil circuit after contacting with the motor shaft, and one side of the inclined section is equipped with the undulating structure. Multiple locking sheets are installed in two installation ring grooves respectively, and are located at the outside of sealing lip, are used for locking sealing lip in the installation ring groove. The lubricating oil circuit formed by the oil hole can supplement the lubricating grease regularly, lubricates the sealing lip, and the entering lubricating grease can also effectively reduce the friction heat between the sealing lip and the motor shaft, avoids the motor shaft surface abrasion or damage caused by long -term operation. The sealed cavity formed by multiple inclined sections after contacting with the motor shaft enhances the sealing and lubrication effect.

Description

Technical Field

[0001] This utility model relates to the field of oil seal technology, and in particular to an oil seal and a motor. Background Technology

[0002] The sealing and protection system of rotating equipment has a critical impact on the service life and safe and reliable operation of the equipment. If no sealing device is installed during the rotation of the equipment, external dust, rainwater and other impurities can easily enter the equipment, fill the cavities or enter the rotating bearings, leading to poor lubrication, bearing damage, or even equipment shutdown.

[0003] In existing technologies, many motors or reducers using fully enclosed bearings typically employ composite oil seals for sealing and protection, preventing dust, rainwater, and other impurities from entering the equipment from the outside, thus achieving high protection performance, with a protection level reaching IP67. However, these devices often operate continuously for extended periods, and the internal components usually lack the grease or lubricating oil necessary to lubricate the sealing lips of the composite oil seals. Due to the high coefficient of friction of the composite oil seal sealing lips, prolonged operation can easily lead to an increase in bearing temperature at this contact point. In severe cases, this can result in excessively high bearing temperature, seizure, or burnout, and may also cause irreversible damage to the equipment shaft, thereby affecting the subsequent sealing and protection effect. Utility Model Content

[0004] The first objective of this utility model is to provide an oil seal that solves the technical problem in the prior art where the temperature of the sealing lip rises due to friction, which can easily damage the bearing and motor shaft.

[0005] A further objective of this invention is to improve the anti-slip performance of the sealing lip.

[0006] The second aspect of this utility model is to provide a motor having the above-mentioned oil seal.

[0007] According to the first aspect of the present invention, the present invention provides an oil seal, comprising: The outer casing extends axially and is fitted onto the motor shaft of the motor. The outer casing has an oil passage hole that communicates with the oil injection hole on the motor to form a lubrication oil passage. The outer casing has mounting annular grooves on opposite sides. Multiple sealing lips are respectively installed in the two mounting ring grooves. Each sealing lip has an inclined section arranged at a preset angle with the motor shaft. After the multiple inclined sections contact the motor shaft, they form a sealing cavity. The sealing cavity is connected to the lubricating oil passage. One side of the inclined section is provided with an undulating structure. At least one of the undulating structures of the multiple inclined sections is located inside the sealing cavity. Multiple locking plates are respectively installed in the two mounting ring grooves and located outside the sealing lip, for locking the sealing lip in the mounting ring groove.

[0008] Optionally, the inclined sections of all the sealing lips are inclined outward toward the motor shaft.

[0009] Optionally, the preset angle range is 40°-50°.

[0010] Optionally, the undulating structure is wave-shaped, sawtooth-shaped, or spiral-shaped.

[0011] Optionally, each of the sealing lips further includes a vertical section, one side of which is fitted with the locking piece and locked by the locking piece within the mounting ring groove.

[0012] Optionally, the side of the outer casing that fits against the vertical section is provided with at least one groove. The locking piece has at least one annular groove on the side that fits against the vertical section.

[0013] Optionally, the number of grooves is multiple, and the multiple grooves are spaced apart along the circumference of the outer shell.

[0014] Optionally, there are two sealing lips and two locking pieces, with one sealing lip and one locking piece installed in each mounting ring groove.

[0015] Optionally, the sealing lip is made of Teflon material.

[0016] In accordance with the second aspect of the present invention, the present invention also provides an electric motor, including the oil seal described above.

[0017] In this invention, the outer casing has an oil passage hole that connects to the oil filling hole on the motor, thus forming a lubrication oil passage. Mounting ring grooves are provided on opposite sides of the outer casing, and multiple sealing lips are installed in two mounting ring grooves respectively. Each sealing lip has an inclined section arranged at a preset angle to the motor shaft. After contacting the motor shaft, the multiple inclined sections form a sealing cavity, which connects to the lubrication oil passage. Multiple locking pieces are installed in the two mounting ring grooves, located outside the sealing lips, to lock the sealing lips within the mounting ring grooves. Through this structural design, the lubrication oil passage formed by the oil passage hole allows the user to periodically replenish grease, providing continuous lubrication to the sealing lips. The grease entering also effectively reduces the frictional heat between the sealing lips and the motor shaft, preventing wear or damage to the motor shaft surface due to long-term operation. Furthermore, the sealing cavity formed by the multiple inclined sections after contacting the motor shaft further enhances the sealing and lubrication effect, thereby achieving superior sealing protection performance and operational reliability.

[0018] Meanwhile, one side of the inclined section is equipped with an undulating structure, and at least one undulating structure of multiple inclined sections is located inside the sealing cavity. This undulating structure not only has oil return and oil-retaining functions, but can also be understood as creating multiple tiny oil groove spaces, allowing grease to be effectively retained within the sealing contact interface. On one hand, this undulating structure can guide the grease squeezed or thrown out during operation back to the sealing contact area, thus maintaining the grease's long-term distribution. On the other hand, the oil-retaining space provided by the undulating structure can increase the grease retention, forming a stable oil film at the sealing interface and reducing direct dry friction between the sealing lip and the motor shaft. This not only effectively reduces frictional heat and wear, delays sealing lip aging, but also further improves the stability and reliability of the sealing performance, ensuring continuous sealing and lubrication effects during long-term equipment operation.

[0019] Furthermore, in this invention, the side of the outer shell that fits against the vertical section is provided with at least one groove, and the side of the locking plate that fits against the vertical section is provided with at least one annular groove. After the sealing lip is pressed by the locking plate, the groove and the annular groove together form a structural interface that enhances friction. Thus, on the one hand, it significantly improves the anti-slip capability of the sealing lip in the axial direction, preventing the sealing lip from rotating with the shaft due to uneven force or long-term operation after forming frictional contact with the motor shaft; on the other hand, it ensures that the sealing lip always works in the predetermined position, thereby stabilizing the sealing state and avoiding sealing failure, accelerated wear, or abnormal temperature rise caused by the rotation of the sealing lip, thus improving the service life and operational reliability of the sealing lip.

[0020] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0021] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic structural diagram of an oil seal installed on a motor according to an embodiment of the present invention; Figure 2 This is a schematic structural diagram of an oil seal according to an embodiment of the present invention; Figure 3 yes Figure 2 A schematic structural diagram of the outer shell in the oil seal shown; Figure 4 yes Figure 2 A schematic structural diagram of the locking plate in the oil seal shown; Figure 5 yes Figure 2 A schematic structural diagram of the sealing lip in the oil seal shown; Figure 6 yes Figure 5 A schematic enlarged view of part A.

[0022] Figure label: 100-Oil seal, 210-Motor shaft, 220-Oil filling hole, 230-Motor end cover, 240-Oil filling cup, 10-Outer shell, 20-Locking piece, 30-Sealing lip, 11-Oil passage hole, 12-Mounting ring groove, 13-Groove, 21-Annular groove, 31-Vertical section, 32-Inclined section, 321-Undulating structure. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may be further included.

[0025] Unless otherwise expressly specified and limited, the terms "connection," "installation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Unless otherwise specified, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] Figure 1 This is a schematic structural diagram of an oil seal 100 installed on a motor according to an embodiment of the present invention. Figure 2 This is a schematic structural diagram of an oil seal 100 according to an embodiment of the present invention. Figure 3 yes Figure 2A schematic structural diagram of the outer shell 10 in the oil seal 100 is shown. Figures 1 to 3 As shown, in a specific embodiment, the oil seal 100 includes a housing 10, multiple sealing lips 30, and multiple locking plates 20. The housing 10 extends axially and is sleeved on the motor shaft 210 of the motor. The housing 10 has an oil passage hole 11, which communicates with the oil injection hole 220 on the motor to form a lubrication oil passage. Mounting ring grooves 12 are provided on opposite sides of the housing 10. Multiple sealing lips 30 are respectively installed in two mounting ring grooves 12. Each sealing lip 30 has an inclined section 32 arranged at a preset angle to the motor shaft 210. After contacting the motor shaft 210, the multiple inclined sections 32 form a sealing cavity, which communicates with the lubrication oil passage. One side of the inclined section 32 has an undulating structure 321, and at least one undulating structure 321 of the multiple inclined sections 32 is located inside the sealing cavity. Multiple locking plates 20 are respectively installed in two mounting ring grooves 12 and located outside the sealing lips 30, for locking the sealing lips 30 within the mounting ring grooves 12. Here, the oil seal 100 of this embodiment is installed between the motor end cover 230 and the motor shaft 210. The outer shell 10 is press-fitted into the groove of the motor end cover 230 by a press. The outer shell 10 and the motor end cover 230 are interference-fitted, and the sealing lip 30 is in interference contact with the motor shaft 210. An oil cup 240 is installed on the motor end cover 230. When installing the oil cup 240, it is necessary to ensure that the oil filling hole 220 on the motor end cover 230 is aligned with the oil passage hole 11 of the oil seal 100 to ensure that the lubrication oil passage is not blocked. After the motor is assembled, the oil seal 100 provides a protective seal for the through-hole of the motor shaft 210 and also has a refillable lubrication function.

[0028] Through the above-described structural design, the lubrication path formed by the oil passage 11 in this embodiment allows users to periodically replenish grease, providing continuous lubrication to the sealing lip 30. The incoming grease can also effectively reduce the frictional heat between the sealing lip 30 and the motor shaft 210, preventing wear or damage to the surface of the motor shaft 210 due to long-term operation. The sealing cavity formed by the multiple inclined sections 32 after contacting the motor shaft 210 further enhances the sealing and lubrication effect, thereby achieving better sealing protection performance and operational reliability. At the same time, the undulating structure 321 on the inclined section 32 not only has oil return and oil-containing functions, but can also be understood as constructing multiple tiny oil groove spaces, allowing the grease to be effectively retained within the sealing contact interface. On the one hand, the undulating structure 321 can guide the grease that is squeezed or thrown out during operation back to the sealing contact area, thus maintaining the long-term distribution of the grease. On the other hand, the oil-containing space provided by the undulating structure 321 can increase the grease retention, forming a stable oil film at the sealing interface and reducing direct dry friction between the sealing lip 30 and the motor shaft 210. This not only effectively reduces frictional heat and wear and delays the aging of the sealing lip 30, but also further improves the stability and reliability of the sealing performance, ensuring the continuous sealing and lubrication effects during long-term operation of the equipment.

[0029] During installation, the sealing lip 30 is first installed into the mounting ring groove 12 of the housing 10, and then the locking plate 20 is installed into the mounting ring groove 12 of the housing 10, and the sealing lip 30 is locked. After installation, the direction and angle of the sealing lip 30 are fixed. Here, the sealing lip 30 and the locking plate 20 are pressed into the mounting ring groove 12 for fixation using an interference fit press. In addition, the reasonable interference fit between the sealing lip 30 and the motor shaft 210 is determined through simulation analysis, so that the sealing lip 30 can maintain sufficient sealing pressure after assembly while avoiding excessive wear on the motor shaft 210. Through the optimized design of this interference fit, not only can grease leakage from the seal be effectively prevented, ensuring that the sealing performance of the equipment meets the IP67 protection level requirements, but also irreversible damage to the motor shaft 210 caused by excessive friction can be avoided. At the same time, the reasonable interference fit also helps to reduce the frictional heat of the sealing interface, ensuring that the operating temperature of the equipment bearing is maintained within a safe range, thereby improving the overall operational reliability and service life of the machine.

[0030] In some embodiments, the inclined sections 32 of all sealing lips 30 are inclined outwards towards the motor shaft 210 to ensure that external dust, rainwater, and other debris do not enter the equipment, thus improving protective performance. In some embodiments, the preset angle range is 40°-50°, such as 40°, 45°, or 50°. An angle that is too large cannot guarantee a protective seal, while an angle that is too small will cause the motor bearing temperature to become too high. In other embodiments, the preset angle can also be determined according to specific design requirements.

[0031] In some embodiments, the undulating structure 321 is wavy, serrated, or spiral. A wavy shape can be understood as being formed by a series of circular protrusions. The extension length of the undulating structure 321 can be determined according to specific design requirements. In other embodiments, the undulating structure 321 can also be designed in other deformable shapes.

[0032] In some embodiments, each sealing lip 30 further includes a vertical section 31, one side of which abuts against the locking piece 20 and is locked within the mounting ring groove 12 by the locking piece 20. It can be understood that one end of the sealing lip 30 is locked onto the housing 10, while the other end is a free end.

[0033] In some embodiments, the side of the housing 10 that fits against the vertical section 31 is provided with at least one groove 13, and the side of the locking piece 20 that fits against the vertical section 31 is provided with at least one annular groove 21. After the sealing lip 30 is pressed by the locking piece 20, the groove 13 and the annular groove 21 together form a structural interface that enhances friction. This significantly improves the anti-slip capability of the sealing lip 30 in the axial direction, preventing the sealing lip 30 from rotating with the motor shaft 210 after frictional contact with the motor shaft 210 due to uneven force or long-term operation. On the other hand, it ensures that the sealing lip 30 always remains in a predetermined position, thereby stabilizing the sealing state and avoiding sealing failure, increased wear, or abnormal temperature rise caused by the rotation of the sealing lip 30, thus improving the service life and operational reliability of the sealing lip 30.

[0034] In some embodiments, the number of grooves 13 is multiple, and the multiple grooves 13 are spaced apart circumferentially along the housing 10. Here, the number of grooves 13 is six, and the six grooves 13 are evenly arranged on the housing 10. In other embodiments, the number of grooves 13 may also be designed to be five, seven, or eight, etc.

[0035] In some embodiments, the groove 13 is circular. In other embodiments, the shape of the groove 13 may be determined according to specific design requirements.

[0036] In some embodiments, there are two sealing lips 30 and two locking pieces 20, with one sealing lip 30 and one locking piece 20 installed in each mounting ring groove 12. During installation, one sealing lip 30 is first installed into the mounting ring groove 12 on one side of the housing 10, and then the locking piece 20 is installed to press the sealing lip 30 tightly into the mounting ring groove 12. Then the sealing lip 30 and locking piece 20 on the other side are installed.

[0037] In some embodiments, the two sealing lips 30 have undulating structures 321, one of which is located inside the sealing cavity and the other is located outside the sealing cavity. In other embodiments, both undulating structures 321 may be located inside the sealing cavity.

[0038] In some embodiments, the sealing lip 30 is made of Teflon material, which has the characteristics of low coefficient of friction, strong self-lubrication, good wear resistance, and high temperature resistance. In working environments where it is in long-term contact and continuous friction with the motor shaft 210, this material can significantly reduce the frictional resistance between the sealing lip 30 and the motor shaft 210, reducing the heat generated by friction during operation, thereby effectively preventing abnormal temperature rise at the sealing and bearing positions. This reduces the risk of aging or deformation of the sealing lip 30 due to high temperatures and prevents wear on the surface of the motor shaft 210, extending the service life of the sealing structure and the entire machine. Furthermore, Teflon material has excellent chemical stability and is not easily degraded by lubricating grease or external environmental factors such as moisture and dust, maintaining good sealing performance and reliability for a long time.

[0039] This embodiment also provides a motor, which includes the oil seal 100 of any of the above embodiments. Details regarding the oil seal 100 are not provided here.

[0040] This embodiment, under grease lubrication, can reduce the heat generated by friction between the sealing lip 30 and the motor shaft 210, ensuring that the bearing temperature remains within a safe range, extending the service life of the equipment, and reducing malfunctions and downtime. After contacting the motor shaft 210, the sealing lip 30 forms a locally sealed cavity, thereby enhancing the sealing and lubrication effect. Simultaneously, a lubrication oil passage is provided at the housing 10, allowing users to periodically replenish grease or use an automatic grease injector for continuous grease replenishment, thus ensuring that the sealing lip 30 will not damage the motor shaft 210 during long-term operation of the equipment.

[0041] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. An oil seal, characterized in that, include: The outer casing extends axially and is fitted onto the motor shaft of the motor. The outer casing has an oil passage hole that communicates with the oil injection hole on the motor to form a lubrication oil passage. The outer casing has mounting annular grooves on opposite sides. Multiple sealing lips are respectively installed in the two mounting ring grooves. Each sealing lip has an inclined section arranged at a preset angle with the motor shaft. After the multiple inclined sections contact the motor shaft, they form a sealing cavity. The sealing cavity is connected to the lubricating oil passage. One side of the inclined section is provided with an undulating structure. At least one of the undulating structures of the multiple inclined sections is located inside the sealing cavity. Multiple locking plates are respectively installed in the two mounting ring grooves and located outside the sealing lip, for locking the sealing lip in the mounting ring groove.

2. The oil seal according to claim 1, characterized in that, All the inclined sections of the sealing lips are inclined toward the outside of the motor shaft.

3. The oil seal according to claim 2, characterized in that, The preset angle range is 40°-50°.

4. The oil seal according to any one of claims 1-3, characterized in that, The undulating structure is wave-shaped, sawtooth-shaped, or spiral-shaped.

5. The oil seal according to any one of claims 1-3, characterized in that, Each of the sealing lips also includes a vertical section, one side of which is fitted with the locking piece and locked by the locking piece within the mounting ring groove.

6. The oil seal according to claim 5, characterized in that, The outer shell has at least one groove on the side that fits against the vertical section. The locking piece has at least one annular groove on the side that fits against the vertical section.

7. The oil seal according to claim 6, characterized in that, The number of grooves is multiple, and the multiple grooves are spaced apart along the circumference of the outer shell.

8. The oil seal according to any one of claims 1-3, characterized in that, The number of sealing lips and locking pieces are both two, with one sealing lip and one locking piece installed in each mounting ring groove.

9. The oil seal according to any one of claims 1-3, characterized in that, The sealing lip is made of Teflon material.

10. An electric motor, characterized in that, Including the oil seal as described in any one of claims 1-9.

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