Electrically conductive nonwoven oil seal

Abstract

The application provides a conductive non-woven fabric oil seal, which is sleeved in a cavity between a shell and a shaft and comprises an elastic base body, an elastic body and a conductive cloth, wherein the elastic base body and the elastic body are annular structures, the elastic body is arranged on the inner circumferential side of the elastic base body, the conductive cloth is arranged on the inner circumferential side of the elastic body, the elastic body is configured to provide a holding force for holding the conductive cloth to adhere to the side surface of the shaft, the outer circumferential end of the elastic base body is in interference fit with the inner wall of the shell, the elastic base body and the conductive cloth are both conductive, the conductive cloth is electrically connected with the shaft, the elastic base body is electrically connected with the shell, and the conductive cloth is electrically connected with the elastic base body, so that the assembly stability of the conductive non-woven fabric oil seal in the cavity is improved, the conductive cloth is ensured to stably adhere to the outer circumferential surface of the shaft, the stable electrical connection between the shaft and the shell is ensured, the potential difference of the shaft is effectively eliminated, and the electric corrosion of the shaft is prevented.

Description

Technical Field

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

[0002] Against the backdrop of the rapid development of the new energy vehicle industry, the drive motor, as the core component of vehicle power output, directly determines the overall vehicle performance and service life through its operational reliability. During the operation of the drive motor in a new energy vehicle, the presence of shaft voltage creates a potential difference between the outer and inner rings of the bearing, leading to shaft current and causing bearing electro-corrosion, which poses a threat to driving safety.

[0003] Meanwhile, to meet the higher requirements of new energy vehicles for motor power density and heat dissipation efficiency, high-end new energy vehicle drive motors generally adopt more integrated oil-cooled heat dissipation structures. Currently, the mainstream solution for shaft current control of oil-cooled motors in the industry mainly involves opening multiple mounting slots distributed along the circumference on the inner wall of the annular body, fixing conductive fibers one by one in the mounting slots, and then assembling the annular body on the corresponding position of the motor end cover or bearing seat, so that the free end of the conductive fiber makes elastic contact with the outer circular surface of the motor shaft, thereby constructing a conductive path between the motor shaft and the cavity and achieving potential difference balance.

[0004] However, in practical applications, after prolonged use, the conductive fibers may deform and fail to make sufficient contact with the bearing, leading to a decrease in conductivity. Utility Model Content

[0005] The purpose of this application is to provide a conductive nonwoven fabric oil seal to solve the problem of poor contact between the conductive fibers of the oil seal and the shaft of the oil-cooled motor during long-term use, which leads to a decrease in conductivity.

[0006] To achieve this objective, the following technical solution is adopted in this application:

[0007] This application provides a conductive nonwoven fabric oil seal, which is fitted into a cavity between a housing and a shaft. The oil seal includes an elastic matrix, an elastic body, and a conductive fabric, wherein:

[0008] Both the elastic matrix and the elastomer are ring-shaped structures, with the elastomer disposed on the inner circumference of the elastic matrix.

[0009] The conductive cloth is disposed on the inner circumferential side of the elastomer, which is configured to provide a clamping force to keep the conductive cloth abutting against the side of the shaft, and the outer circumferential end of the elastic matrix is ​​interference-fitted with the inner wall of the housing.

[0010] Both the elastic substrate and the conductive cloth are conductive. The conductive cloth is electrically connected to the shaft, the elastic substrate is electrically connected to the shell, and the conductive cloth is electrically connected to the elastic substrate.

[0011] Optionally, the conductive fabric is configured as a conductive nonwoven fabric, and the conductive fabric is configured as a ring structure. The outer periphery of the conductive fabric is attached to the inner periphery of the elastomer. The cross-section of the conductive fabric includes a continuous first horizontal segment, an inclined segment, and a vertical segment, wherein:

[0012] The first horizontal segment extends radially, and the first end of the first horizontal segment is fixedly connected to the elastic matrix. The second end of the first horizontal segment is connected to the first end of the inclined segment. The vertical segment extends axially, and the second end of the inclined segment is connected to the first end of the vertical segment.

[0013] Optionally, the conductive nonwoven fabric oil seal also includes a ring-shaped clamping spring, and the elastic body is provided with an annular mounting part, which is arranged radially corresponding to the first horizontal segment;

[0014] The clamping spring is installed inside the annular mounting part, and the clamping spring is adapted to the annular mounting part. The clamping spring is configured to apply force to the elastomer in the inward circumferential direction close to the axis.

[0015] Optionally, the annular mounting portion is configured as a first annular groove, which is formed on the outer peripheral surface of the elastomer;

[0016] Alternatively, the annular mounting portion can be configured as an annular channel, which is located inside the elastomer.

[0017] Optionally, the conductive nonwoven fabric oil seal also includes a metal skeleton, which is fixedly connected to the elastic substrate and is configured to reinforce and support the elastic substrate.

[0018] Optionally, the metal frame is a ring structure with an "L" shaped cross-section. The outer periphery of the metal frame abuts against the inner wall of the shell to achieve electrical connection between the metal frame and the shell.

[0019] Optionally, the outer peripheral wall of the metal skeleton is partially exposed and the elastic matrix covers the outer peripheral wall of the metal skeleton, while the inner peripheral wall of the metal skeleton is partially exposed and the root of the elastic body covers the end of the second horizontal segment of the metal skeleton extending radially.

[0020] Optionally, the outer peripheral wall of the metal skeleton is partially exposed and the elastic matrix covers the outer peripheral wall of the metal skeleton, the elastic matrix covers the inner peripheral wall of the metal skeleton and the root of the elastic body covers the end of the third horizontal segment of the metal skeleton extending radially, and the first horizontal segment of the conductive cloth extends to the bottom of the third horizontal segment and is fixedly connected to the third horizontal segment.

[0021] Optionally, the outer periphery of the metal skeleton and the elastic matrix are respectively provided with a first chamfer, and the inner periphery of the elastic body is provided with a second chamfer.

[0022] Optionally, both the elastic matrix and the elastomer are made of conductive rubber material.

[0023] Compared with the prior art, the conductive nonwoven fabric oil seal proposed in this application has the following advantages:

[0024] 1) By making the elastic matrix and conductive cloth conductive and electrically connected to each other, and forming electrical connections with the housing and shaft respectively, while utilizing the elastic body to provide a clamping force to keep the conductive cloth close to the side of the shaft, and the outer peripheral end of the elastic matrix is ​​interference-fitted with the inner wall of the housing, the assembly stability of the conductive nonwoven oil seal in the cavity is improved, while ensuring that the conductive cloth is stably close to the outer peripheral surface of the shaft, thereby ensuring a stable electrical connection between the shaft and the housing, effectively eliminating the potential difference of the shaft, and preventing the shaft from electro-corrosion.

[0025] 2) By setting the conductive cloth as a ring-shaped conductive nonwoven fabric with a specific cross-section, a large-area stable contact between the conductive cloth and the shaft and a solid connection with the elastic matrix are achieved, thereby ensuring the conductivity of the oil seal during long-term use.

[0026] 3) By setting the annular mounting part as the first annular groove on the outer circumference of the elastic body, the clamping spring is conveniently installed and securely positioned, which facilitates the assembly and subsequent maintenance of the spring, and effectively restricts the position of the clamping spring. By setting the annular mounting part as an annular channel inside the elastic body, the clamping spring is securely installed inside, isolating the clamping spring from external impurities and reducing the corrosion of the spring by the environment. At the same time, the channel structure can restrict the displacement of the spring in all directions, ensuring that the direction and force of its application to the elastic body are always stable, and maintaining the long-term reliability of the conductivity.

[0027] 4) By extending the first horizontal section of the conductive cloth to below the third horizontal section of the metal frame and fixing it in place, a direct electrical connection between the conductive cloth and the metal frame is achieved, adding a conductive path from the conductive cloth to the metal frame and then to the shell, reducing the conductive impedance, and thus enhancing the conductivity. Attached Figure Description

[0028] To more clearly illustrate and understand the technical solutions in the embodiments of this application, the accompanying drawings used in the background technology and embodiment descriptions of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0029] Figure 1 This is a cross-sectional view of the first embodiment of the conductive nonwoven fabric oil seal provided in this application;

[0030] Figure 2 This is a cross-sectional view of a second embodiment of the conductive nonwoven fabric oil seal provided in this application.

[0031] Figure 3 This is a cross-sectional view of the third embodiment of the conductive nonwoven fabric oil seal provided in this application.

[0032] Figure 4 This is a cross-sectional view of the fourth embodiment of the conductive nonwoven fabric oil seal provided in this application. Detailed Implementation

[0033] To facilitate understanding of this application, a more complete description of the application will be provided below with reference to the accompanying drawings. Preferred embodiments of the application are shown in the drawings. However, the application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application. It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Please see Figures 1 to 4 As shown in the embodiment of this application, a conductive nonwoven fabric oil seal is provided. The conductive nonwoven fabric oil seal is installed in the cavity 30 between the housing 10 and the shaft 20. It includes an elastic base 40, an elastic body 50, and a conductive cloth 60. The elastic base 40 and the elastic body 50 are both annular structures. The elastic body 50 is disposed on the inner circumferential side of the elastic base 40. The conductive cloth 60 is disposed on the inner circumferential side of the elastic body 50. The elastic body 50 is configured to provide a clamping force to keep the conductive cloth 60 against the side of the shaft 20. The outer circumferential end of the elastic base 40 is interference-fitted with the inner wall of the housing 10. Both the elastic base 40 and the conductive cloth 60 are conductive. The conductive cloth 60 is electrically connected to the shaft 20, the elastic base 40 is electrically connected to the housing 10, and the conductive cloth 60 is electrically connected to the elastic base 40.

[0035] Specifically, a ring of protrusions 41 is integrally provided on the outer periphery of the elastic substrate 40. The protrusions 41 are interference-fitted with the inner wall of the housing 10 to improve the stability of the oil seal after installation and prevent the oil seal from shifting or loosening due to vibration or pressure changes during operation.

[0036] Specifically, the elastic matrix 40 and the elastomer 50 are integrated, and both the elastic matrix 40 and the elastomer 50 are in a radially compressed state within the cavity 30.

[0037] By making the elastic substrate 40 and the conductive cloth 60 conductive and electrically connected to each other, and forming electrical connections with the housing 10 and the shaft 20 respectively, while the elastic body 50 provides a clamping force to keep the conductive cloth 60 against the side of the shaft 20, and the outer peripheral end of the elastic substrate 40 is interference-fitted with the inner wall of the housing 10, the assembly stability of the conductive nonwoven oil seal in the cavity 30 is improved, and the conductive cloth 60 is stably attached to the outer peripheral surface of the shaft 20. This ensures a stable electrical connection between the shaft 20 and the housing 10, effectively eliminates the potential difference of the shaft 20, and prevents the electrical corrosion of the shaft 20.

[0038] In one embodiment, the conductive fabric 60 is configured as a conductive nonwoven fabric, and the conductive fabric 60 is configured as a ring structure. The outer peripheral side of the conductive fabric 60 is attached to the inner peripheral side of the elastic body 50. The cross-section of the conductive fabric 60 includes a continuous first horizontal segment 61, an inclined segment 62, and a vertical segment 63, wherein: the first horizontal segment 61 is radially ( Figure 1 Extending in the direction of X, the first end of the first horizontal segment 61 is fixedly connected to the elastic matrix 40, the second end of the first horizontal segment 61 is connected to the first end of the inclined segment 62, and the vertical segment 63 extends along the axial direction ( Figure 1 Extending in the direction of Y, the second end of the inclined segment 62 is connected to the first end of the vertical segment 63.

[0039] Specifically, the conductive cloth 60 is fixedly connected to the elastomer 50 by a conductive adhesive, which not only prevents the conductive cloth 60 from shifting or falling off during use, ensuring the reliability of the connection between the two, thereby ensuring the stability of the oil seal installed in the cavity, but also ensures the smooth conduction between the conductive cloth and the elastomer, maintaining the reliability of the overall conductivity.

[0040] By setting the conductive cloth 60 as a ring-shaped conductive nonwoven fabric with a specific cross-section, a large-area stable contact between the conductive cloth 60 and the shaft 20 and a solid connection with the elastic substrate 40 are achieved, thereby ensuring the conductivity of the oil seal during long-term use.

[0041] In one embodiment, the conductive nonwoven fabric oil seal further includes an annular clamping spring 70. An annular mounting portion 80 is provided on the elastic body 50, and the annular mounting portion 80 is radially corresponding to the first horizontal segment 61. The clamping spring 70 is installed in the annular mounting portion 80 and is adapted to the annular mounting portion 80. The clamping spring 70 is configured to apply force to the elastic body 50 in the inward circumferential direction toward the shaft 20.

[0042] By installing a clamping spring 70 inside the annular mounting portion 80 of the elastic body 50, a continuous inward circumferential force is applied to the elastic body 50, ensuring that the elastic body 50 drives the conductive cloth 60 to always be tightly attached to the shaft 20. This avoids loosening of the conductive contact due to the elastic decay of the elastic body 50, and ensures the long-term stability and smoothness of the conductive path.

[0043] In one embodiment, the annular mounting portion 80 is configured as a first annular groove, which is formed on the outer peripheral surface of the elastic body 50; or, the annular mounting portion 80 is configured as an annular channel, which is disposed inside the elastic body 50.

[0044] By setting the annular mounting part 80 as a first annular groove on the outer circumference of the elastic body 50, the clamping spring 70 is conveniently installed and securely positioned, facilitating spring assembly and subsequent maintenance, while effectively limiting the position of the clamping spring 70. By setting the annular mounting part 80 as an annular channel within the elastic body 50, the clamping spring 70 is securely installed internally, isolating it from external impurities and reducing environmental corrosion. At the same time, the channel structure can restrict spring displacement in all directions, ensuring that the direction and force of its application to the elastic body 50 remain stable, maintaining long-term reliable conductivity.

[0045] In one embodiment, the conductive nonwoven fabric oil seal further includes a metal skeleton 90, which is fixedly connected to the elastic substrate 40 and is configured to reinforce and support the elastic substrate 40.

[0046] Specifically, the metal frame 90 is made of metal, such as stainless steel or cold-rolled steel.

[0047] By setting a metal skeleton 90 that is fixedly connected to the elastic substrate 40, the elastic substrate 40 is strengthened and supported, the deformation resistance of the elastic substrate 40 is improved, and it is prevented from cracking during installation or long-term use, thus extending the service life of the oil seal.

[0048] In one embodiment, the metal frame 90 is a ring structure with an "L"-shaped cross-section. The outer periphery of the metal frame 90 abuts against the inner wall of the housing 10 to achieve electrical connection between the metal frame 90 and the housing 10.

[0049] By designing the metal skeleton 90 as a ring structure with its outer periphery abutting against the inner wall of the housing 10, a stable electrical connection between the metal skeleton 90 and the housing 10 along the circumference and a firm support for the elastic substrate 40 are achieved, thereby enhancing the reliability of the conductive path.

[0050] In one embodiment, the outer peripheral wall of the metal skeleton 90 is partially exposed and the elastic matrix 40 covers the outer peripheral wall of the metal skeleton 90, the inner peripheral wall of the metal skeleton 90 is partially exposed and the root of the elastomer 50 covers the end of the second horizontal segment 91 of the metal skeleton 90 extending radially.

[0051] By exposing the outer and inner peripheral walls of the metal skeleton 90 and covering the rest with the roots of the elastic matrix 40 and the elastic body 50, an efficient electrical connection and stable combination of the metal skeleton 90 with the shell 10, the elastic matrix 40 and the elastic body 50 are achieved, ensuring smooth conductive paths and enhancing the stability of the overall structure.

[0052] In one embodiment, the outer peripheral wall of the metal skeleton 90 is partially exposed and the elastic matrix 40 covers the outer peripheral wall of the metal skeleton 90. The elastic matrix 40 covers the inner peripheral wall of the metal skeleton 90 and the root of the elastic body 50 covers the end of the third horizontal segment 92 of the metal skeleton 90 extending radially. The first horizontal segment 61 of the conductive cloth 60 extends below the third horizontal segment 92 and is fixedly connected to the third horizontal segment 92.

[0053] By extending the first horizontal segment 61 of the conductive cloth 60 to below the third horizontal segment 92 of the metal frame 90 and fixing it in place, a direct electrical connection between the conductive cloth 60 and the metal frame 90 is achieved. This adds a conductive path from the conductive cloth 60 to the metal frame 90 and then to the housing 10, reducing the conductive impedance and thus enhancing the conductivity.

[0054] In one embodiment, the outer periphery of the metal skeleton 90 and the elastic substrate 40 are respectively provided with a first chamfer 94, and the inner periphery of the elastic body 50 is provided with a second chamfer 51.

[0055] By setting a first chamfer 94 on the outer periphery of the metal skeleton 90 and the elastic substrate 40, and a second chamfer 51 on the inner periphery of the elastic body 50, the oil seal installation process is made smooth. The direct benefit is that it reduces the wear on the housing 10, shaft 20 and oil seal itself during installation and improves assembly efficiency.

[0056] In one embodiment, both the elastic matrix 40 and the elastomer 50 are made of conductive rubber material.

[0057] Specifically, the elastic matrix 40 and the elastomer 50 are integrally injection molded using conductive rubber.

[0058] By using conductive rubber material to make the elastic matrix 40 and elastomer 50, the conductive function of the elastic matrix 40 and elastomer 50 is realized, which simplifies the overall structure, reduces costs, and ensures the integrity and stability of the conductive path.

[0059] The conductive nonwoven oil seal proposed in this application is suitable for the conductivity between the housing 10 and the shaft 20 in an oily environment.

[0060] The above embodiments merely illustrate the basic principles and characteristics of this application. This application is not limited to the above examples. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A conductive nonwoven fabric oil seal, wherein the conductive nonwoven fabric oil seal is fitted into a cavity between a housing and a shaft, characterized in that, The conductive nonwoven fabric oil seal comprises an elastic matrix, an elastomer, and a conductive fabric, wherein: Both the elastic matrix and the elastic body are ring-shaped structures, and the elastic body is disposed on the inner peripheral side of the elastic matrix; The conductive cloth is disposed on the inner circumferential side of the elastomer, the elastomer is configured to provide a clamping force to hold the conductive cloth against the side of the shaft, and the outer circumferential end of the elastic matrix is ​​interference-fitted with the inner wall of the housing. Both the elastic substrate and the conductive cloth are conductive. The conductive cloth is electrically connected to the shaft, the elastic substrate is electrically connected to the shell, and the conductive cloth is electrically connected to the elastic substrate.

2. The conductive nonwoven fabric oil seal according to claim 1, characterized in that, The conductive fabric is configured as a conductive nonwoven fabric, and the conductive fabric is configured as a ring structure. The outer periphery of the conductive fabric is attached to the inner periphery of the elastic body. The cross-section of the conductive fabric includes a continuous first horizontal segment, an inclined segment, and a vertical segment, wherein: The first horizontal segment extends radially, and the first end of the first horizontal segment is fixedly connected to the elastic matrix. The second end of the first horizontal segment is connected to the first end of the inclined segment. The vertical segment extends axially, and the second end of the inclined segment is connected to the first end of the vertical segment.

3. The conductive nonwoven fabric oil seal according to claim 2, characterized in that, The conductive nonwoven fabric oil seal also includes a ring-shaped clamping spring, and the elastic body is provided with a ring mounting part, which is arranged radially corresponding to the first horizontal segment; The clamping spring is installed in the annular mounting portion, the clamping spring is adapted to the annular mounting portion, and the clamping spring is configured to apply force to the elastomer in the inward circumferential direction toward the axis.

4. The conductive nonwoven fabric oil seal according to claim 3, characterized in that, The annular mounting portion is configured as a first annular groove, which is formed on the outer peripheral surface of the elastic body. Alternatively, the annular mounting portion may be configured as an annular channel, which is disposed inside the elastomer.

5. The conductive nonwoven fabric oil seal according to claim 2, characterized in that, The conductive nonwoven fabric oil seal also includes a metal skeleton, which is fixedly connected to the elastic matrix and is configured to reinforce and support the elastic matrix.

6. The conductive nonwoven fabric oil seal according to claim 5, characterized in that, The metal frame is a ring structure with an "L" shaped cross-section. The outer periphery of the metal frame abuts against the inner wall of the housing to achieve electrical connection between the metal frame and the housing.

7. The conductive nonwoven fabric oil seal according to claim 6, characterized in that, The outer peripheral wall of the metal skeleton is partially exposed and the elastic matrix covers the outer peripheral wall of the metal skeleton, while the inner peripheral wall of the metal skeleton is partially exposed and the root of the elastic body covers the end of the second horizontal segment of the metal skeleton extending radially.

8. The conductive nonwoven fabric oil seal according to claim 6, characterized in that, The outer peripheral wall of the metal skeleton is partially exposed and the elastic matrix covers the outer peripheral wall of the metal skeleton. The elastic matrix covers the inner peripheral wall of the metal skeleton and the root of the elastic matrix covers the end of the third horizontal segment of the metal skeleton extending radially. The first horizontal segment of the conductive cloth extends below the third horizontal segment and is fixedly connected to the third horizontal segment.

9. The conductive nonwoven fabric oil seal according to claim 6, characterized in that, The outer periphery of the metal skeleton and the elastic matrix are respectively provided with a first chamfer, and the inner periphery of the elastic body is provided with a second chamfer.

10. The conductive nonwoven fabric oil seal according to claim 1, characterized in that, Both the elastic matrix and the elastic body are made of conductive rubber material.

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