Oil seal structure and oil-cooled motor

Abstract

The application provides a sealing structure for the technical field of electric machines, in particular an oil seal structure, comprising: an oil seal body, which can be sleeved on a rotor shaft of an electric machine, and a hollow accommodating cavity is arranged in the oil seal body; the oil seal body comprises a first end and a second end in the axial direction, the first end is an end close to a stator of the electric machine, and the second end is an end away from the stator of the electric machine; and an elastic member is arranged in the accommodating cavity and extends along the axial direction of the accommodating cavity, and the elastic member can provide a radial constraint force for the oil seal body to adhere to the rotor shaft. The oil seal structure provides a radial constraint force for the oil seal structure through the elastic member arranged in the accommodating cavity and extending along the axial direction of the accommodating cavity, so that the oil seal body is integrally abutted on the rotor shaft of the electric machine from the first end to the second end, the sealing effect of the oil seal body on the rotor shaft is improved, and the sealing performance of the oil-cooled electric machine is improved. The application also provides an oil-cooled electric machine comprising the oil seal structure.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to an oil seal structure and an oil-cooled motor. Background Technology

[0002] The existing oil seal structure, after being fitted onto the rotor shaft, does not have a significant radial force compression effect and the sealing force is weak. Especially when running on bumpy roads, the sealing effect is not ideal due to vibration. Utility Model Content

[0003] In view of this, this application provides an oil seal structure and an oil-cooled motor. An elastic element provided in the receiving cavity and extending along the axial direction of the receiving cavity provides radial constraint force to the oil seal structure, thereby abutting the oil seal body from the first end to the second end against the rotor shaft of the motor as a whole, improving the sealing effect of the oil seal body on the rotor shaft and increasing the sealing performance of the oil-cooled motor.

[0004] To achieve the above objectives, this application provides the following technical solution: An oil seal structure, comprising: An oil seal body is provided, which can be sleeved on the rotor shaft of the motor. The oil seal body has a hollow receiving cavity. The oil seal body includes a first end and a second end in the axial direction. The first end is the end close to the stator of the motor, and the second end is the end away from the stator of the motor. An elastic element, disposed within the receiving cavity and extending axially along the receiving cavity, provides a radial constraint force for the oil seal body to conform to the rotor shaft.

[0005] Optionally, the radial constraint force of the elastic element on the oil seal body increases from the first end to the second end.

[0006] Optionally, the oil seal body includes an inner sidewall and an outer sidewall. The inner sidewall is attached to the outer periphery of the rotor shaft, and the outer sidewall is radially away from the rotor shaft. An end wall extending radially is also provided between the inner sidewall and the outer sidewall at the first end, and between the inner sidewall and the outer sidewall at the second end. The inner sidewall, the outer sidewall, and the end wall together form the receiving cavity, and the elastic element is sleeved on the inner sidewall and disposed in the receiving cavity.

[0007] Optionally, the thickness of the inner sidewall gradually increases from the first end to the second end; the elastic element is a compression spring, which is disposed in the receiving cavity and sleeved on the inner sidewall, with the end of the compression spring near the second end interlocking with the inner sidewall, and the end of the compression spring near the first end abutting against the first end of the oil seal body.

[0008] Optionally, an opening is provided on the end wall of the first end, and the compression spring can enter the receiving cavity from the opening and be sleeved on the inner side wall, with the end of the compression spring near the first end abutting against the end wall.

[0009] Optionally, an opening is provided on the end wall of the first end, and the compression spring can enter the receiving cavity from the opening and be sleeved on the inner side wall. A limiting block or limiting ring is provided at the opening to constrain the compression spring within the receiving cavity, and the end of the compression spring near the first end abuts against the limiting block or the limiting ring.

[0010] Optionally, the outer diameter of the compression spring is smaller than the inner diameter of the outer side wall.

[0011] Optionally, an annular sealing flange is provided on the inner sidewall surface near the rotor shaft, and the sealing flange abuts against the rotor shaft.

[0012] Optionally, the sealing flange is disposed on the side of the inner sidewall near the second end.

[0013] This application also provides an oil-cooled motor, including a motor housing, a stator, a rotor, a rotor shaft, and a motor end cover, and also includes the oil seal structure, which is disposed inside the motor end cover and sleeved on the rotor shaft.

[0014] The oil seal structure of this application provides radial constraint force to the oil seal structure through an elastic element disposed in the receiving cavity and extending along the axial direction of the receiving cavity, thereby abutting the oil seal body from the first end to the second end against the rotor shaft of the motor as a whole, improving the sealing effect of the oil seal body on the rotor shaft and increasing the sealing performance of the oil-cooled motor.

[0015] The oil-cooled motor of this application, by setting the above-mentioned oil seal structure, increases the sealing performance of the oil-cooled motor, prevents oil leakage, and prevents the oil inside the motor from seeping out from here when the motor vibrates, thereby increasing the sealing performance of the motor end. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the oil-cooled motor of this application.

[0018] Figure 2 This is a cross-sectional view of the oil seal structure of this application.

[0019] Figure 3 for Figure 2 Sectional view at point AA.

[0020] exist Figures 1-3 middle: 1. Motor housing; 2. Stator; 3. Rotor; 31. Rotor shaft; 4. Motor end cover; 5. Oil seal body; 51. Inner wall; 52. Outer wall; 53. End wall; 54. Opening; 55. Limiting ring; 56. Sealing flange; 6. Compression spring. Detailed Implementation

[0021] This application provides an oil seal structure and an oil-cooled motor. An elastic element disposed in the receiving cavity and extending axially along the receiving cavity provides radial constraint force to the oil seal structure, thereby abutting the oil seal body from the first end to the second end against the rotor shaft of the motor as a whole, improving the sealing effect of the oil seal body on the rotor shaft and increasing the sealing performance of the oil-cooled motor.

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] like Figures 1-3 As shown, this application provides an oil seal structure, including: The oil seal body 5 can be sleeved on the rotor shaft 31 of the motor. The oil seal body 5 has a hollow receiving cavity inside. The oil seal body 5 includes a first end and a second end in the axial direction. The first end is the end close to the stator 2 of the motor, and the second end is the end away from the stator 2 of the motor. An elastic element, disposed within the receiving cavity and extending axially along the receiving cavity, provides radial constraint force for the oil seal body 5 to conform to the rotor shaft 31.

[0024] Typically, the oil seal body 5 is made of a soft, elastic material. In this application, an elastic element is provided in the receiving cavity and extends along the axial direction of the receiving cavity. The elastic element can provide radial constraint force to press the oil seal body 5 toward the outer periphery of the rotor shaft 31, that is, to clamp the oil seal body 5 to the outer periphery of the rotor shaft 31, thereby making the oil seal body 5 as a whole abut against the rotor shaft 31 of the motor from the first end to the second end, thereby improving the sealing effect of the oil seal body 5 on the rotor shaft 31.

[0025] In a preferred embodiment, the radial constraint force of the elastic element on the oil seal body 5 increases from the first end to the second end.

[0026] If the radial constraint force of the elastic element on the oil seal body 5 is equal from the first end to the second end, then a larger constraint force is required to ensure the sealing effect, and the wear will be more severe. If the radial constraint force of the elastic element on the oil seal body 5 increases from the first end to the second end, then the area with more severe wear is only the second end. An additional anti-wear structure can be set at this point, which can extend the service life while ensuring the sealing effect.

[0027] In a preferred embodiment, such as Figure 2 and Figure 3 As shown, the oil seal body 5 includes an inner wall 51 and an outer wall 52. The inner wall 51 is attached to the outer periphery of the rotor shaft 31, and the outer wall 52 is radially away from the rotor shaft 31. Radially extending end walls 53 are respectively provided between the inner wall 51 and the outer wall 52 at the first end, and between the inner wall 51 and the outer wall 52 at the second end. The end walls 53 form a support component between the inner wall 51 and the outer wall 52. The inner wall 51, the outer wall 52, and the end walls 53 together form an annular receiving cavity. Alternatively, it can be viewed as holding a cylindrical oil... An annular cavity is carved out of the solid part of the sealing body 5 to house the elastic element; the elastic element is sleeved on the inner side wall 51 and disposed in the annular cavity, so the elastic element is also an annular elastic element; the cavity can be a closed space or a space with an opening 54. If the cavity is a closed space, the elastic element needs to be pre-placed in the cavity and then the opening 54 is closed, or it can be integrally formed; if the cavity is a space with an opening 54, the elastic element is easier to put in and take out and does not need to be pre-placed in the cavity.

[0028] In a preferred embodiment, such as Figure 2 As shown, the thickness of the inner wall 51 (that is, the radial dimension of the inner wall 51) gradually increases from the first end to the second end; the elastic element is a compression spring 6, which is disposed in the receiving cavity and sleeved on the inner wall 51. The end of the compression spring 6 near the second end is interference-fitted with the inner wall 51, and the end of the compression spring 6 near the first end abuts against the first end of the oil seal body 5.

[0029] As the thickness of the inner wall 51 gradually increases from the first end to the second end, after prolonged use, the contact part between the oil seal body 5 and the rotor shaft 31, especially the inner wall 51 at the end of the compression spring 6 near the second end, experiences the greatest radial force and the greatest friction with the rotor shaft 31. Therefore, the inner wall 51 wears the most severely at this point, and its thickness also decreases accordingly. After the inner wall 51 shrinks due to failure at this point, the end of the compression spring 6 near the second end will extend towards the second end, and the interference fit will be closer to the second end. In this way, the part with the greatest friction and the most severe wear will move towards the second end, thus extending the service life of the oil seal structure while ensuring the sealing effect.

[0030] In a preferred embodiment, an opening 54 is provided on the end wall 53 of the first end, and the compression spring 6 can enter the receiving cavity through the opening 54 and be sleeved on the inner side wall 51. The end of the compression spring 6 near the first end abuts against the end wall 53.

[0031] In this embodiment, the compression spring 6 is directly inserted into the receiving cavity through the opening 54, and the axial deformation of the compression spring 6 is restricted by the end wall 53 of the first end. Since the end of the compression spring 6 needs to abut against the end wall 53 of the first end, the position of the opening 54 must be closer to the outer wall 52 for the compression spring 6. Therefore, it is not convenient to install the compression spring 6 on the inner wall 51. In addition, the oil seal body 5 is made of soft material and is easily deformed, so the opening 54 cannot be set too large. However, in this embodiment, there is no need to set an additional limiting block or limiting ring 55, and the overall structure is easier to process.

[0032] In a preferred embodiment, such as Figure 2 As shown, an opening 54 is provided on the end wall 53 of the first end. The compression spring 6 can enter the receiving cavity through the opening 54 and be sleeved on the inner side wall 51. A limiting block or limiting ring 55 is provided at the opening 54 to constrain the compression spring 6 in the receiving cavity. The end of the compression spring 6 near the first end abuts against the limiting block or limiting ring 55.

[0033] Compared to the previous embodiment, where the compression spring 6 is directly inserted into the receiving cavity through the opening 54 and the axial deformation of the compression spring 6 is restricted by the end wall 53 of the first end, in this embodiment, the compression spring 6 is restricted in the receiving cavity by a limiting block or limiting ring 55, which makes it easier to install the compression spring 6. However, the limiting block or limiting ring 55 needs to be fixed separately.

[0034] In a preferred embodiment, such as Figure 2 As shown, the outer diameter of the compression spring 6 is smaller than the inner diameter of the outer wall 52. This makes it easier to install the compression spring 6 into the receiving cavity and also prevents the compression spring 6 from being too large and coming into contact with the outer wall 52, causing it to deform.

[0035] In a preferred embodiment, such as Figure 2 As shown, an annular sealing flange 56 is provided on the surface of the inner wall 51 near the rotor shaft 31, and the sealing flange 56 abuts against the rotor shaft 31.

[0036] The sealing effect between the oil seal structure and the rotor shaft 31 is further enhanced by setting a sealing flange 56 on the surface of the inner sidewall 51 near the rotor shaft 31.

[0037] In a preferred embodiment, such as Figure 2 As shown, the sealing flange 56 is disposed on the side of the inner wall 51 near the second end.

[0038] The inner wall 51 experiences the greatest radial force and friction with the rotor shaft 31 at the end of the compression spring 6 near the second end. Therefore, the inner wall 51 experiences the most severe wear at this point. Thus, the sealing flange 56 is placed here to prevent excessive wear.

[0039] This application also provides an oil-cooled motor, such as Figure 1 As shown, it includes a motor housing 1, a stator 2, a rotor 3, a rotor shaft 31, and a motor end cover 4, and also includes an oil seal structure, which is disposed inside the motor end cover 4 and sleeved on the rotor shaft 31.

[0040] The oil-cooled motor of this application is provided with the above-mentioned oil seal structure, which increases the sealing performance of the oil-cooled motor, prevents oil leakage, and prevents the oil inside the motor from seeping out from here when the motor vibrates, thereby increasing the sealing performance at the end of the motor.

[0041] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0042] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the word “or” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0043] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled or recombined. These disassemblies or recombinations should be considered as equivalent solutions of this application.

[0044] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0045] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0046] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. An oil seal structure, characterized in that, include: Oil seal body (5), the oil seal body (5) can be sleeved on the rotor shaft (31) of the motor, the oil seal body (5) has a hollow receiving cavity; the oil seal body (5) includes a first end and a second end in the axial direction, the first end is the end close to the stator of the motor, and the second end is the end away from the stator of the motor. An elastic element, disposed within the receiving cavity and extending axially along the receiving cavity, provides radial constraint force for the oil seal body (5) to conform to the rotor shaft (31).

2. The oil seal structure according to claim 1, characterized in that, The radial constraint force of the elastic element on the oil seal body (5) increases from the first end to the second end.

3. The oil seal structure according to claim 1, characterized in that, The oil seal body (5) includes an inner sidewall (51) and an outer sidewall (52). The inner sidewall (51) is attached to the outer periphery of the rotor shaft (31), and the outer sidewall (52) is radially away from the rotor shaft (31). An end wall (53) extending radially is also provided between the inner sidewall (51) and the outer sidewall (52) at the first end and between the inner sidewall (51) and the outer sidewall (52) at the second end. The inner sidewall (51), the outer sidewall (52) and the end wall (53) together form the receiving cavity. The elastic element is sleeved on the inner sidewall (51) and disposed in the receiving cavity.

4. The oil seal structure according to claim 3, characterized in that, The thickness of the inner sidewall (51) gradually increases from the first end to the second end; the elastic element is a compression spring (6), which is disposed in the receiving cavity and sleeved on the inner sidewall (51). The end of the compression spring (6) near the second end is interference-fitted with the inner sidewall (51), and the end of the compression spring (6) near the first end abuts against the first end of the oil seal body (5).

5. The oil seal structure according to claim 4, characterized in that, An opening (54) is provided on the end wall (53) of the first end, and the compression spring (6) can enter the receiving cavity from the opening (54) and be sleeved on the inner side wall (51). The end of the compression spring (6) near the first end abuts against the end wall (53).

6. The oil seal structure according to claim 4, characterized in that, An opening (54) is provided on the end wall (53) of the first end. The compression spring (6) can enter the receiving cavity through the opening (54) and be sleeved on the inner side wall (51). A limiting block or limiting ring (55) is provided at the opening (54) to constrain the compression spring (6) in the receiving cavity. The end of the compression spring (6) near the first end abuts against the limiting block or the limiting ring (55).

7. The oil seal structure according to claim 4, characterized in that, The outer diameter of the compression spring (6) is smaller than the inner diameter of the outer wall (52).

8. The oil seal structure according to any one of claims 3-7, characterized in that, An annular sealing flange (56) is provided on the surface of the inner sidewall (51) near the rotor shaft (31), and the sealing flange (56) abuts against the rotor shaft (31).

9. The oil seal structure according to claim 8, characterized in that, The sealing flange (56) is disposed on the side of the inner wall (51) near the second end.

10. An oil-cooled motor, comprising a motor housing (1), a stator (2), a rotor (3), a rotor shaft (31), and a motor end cover (4), characterized in that, It also includes an oil seal structure as described in any one of claims 1-9, wherein the oil seal structure is disposed inside the motor end cover (4) and sleeved on the rotor shaft (31).

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