Conductive sealing element
By designing conductive seals, the sealing body and the conductor come into contact with the shaft and bearing seat respectively, the bearing electrical corrosion problem of the high-voltage inverter automotive electric drive system is solved, and the durability and wear resistance of the seal are achieved while reducing costs.
Patent Information
- Application Number
- CN202422604509.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-28
AI Technical Summary
In the prior art, the electric corrosion problem of bearings in automotive electric drive systems for high-voltage inverters leads to an increase in costs. Although the use of ceramic bearings solves the electric corrosion, it increases costs.
A conductive seal is designed, and the sealing body and the conductor are in contact with the rotating shaft and the bearing seat respectively. The conductor conducts current to reduce the current output of the rotating shaft to the bearing. The sealing body is responsible for the oil seal, and the conductor is responsible for the current transmission. The metal conductive part is contacted with the bearing seat, and the contact conductive part made of PTFE material contacts the rotating shaft to reduce frictional damage.
It effectively reduces the electrical corrosion damage of the bearing, reduces the current output of the shaft to the bearing, and improves the durability and wear resistance of the seal.
Smart Images
Figure CN223306307U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of new energy drive systems, and in particular to a conductive seal. Background Art
[0002] In the field of new energy drive, automotive electric drive systems with high-voltage inverters as the core have become the mainstream technology route. As a result, high voltage, high frequency and high rotation speed have caused the problem of bearing electrical corrosion. Bearing electrical corrosion is caused by the potential difference between the two ends of the rotating shaft or between the shaft and the bearing when the motor is running, forming a current. The current discharges through the lubricating oil film in the bearing, causing local heat melting and unevenness.
[0003] In order to solve the problem of electrical corrosion of bearings, ceramic bearings are used. The outer diameter of the ceramic bearing abuts the bearing seat, and the inner diameter abuts the side wall of the shaft, providing high-strength and insulated rotation support for the shaft, which will lead to a significant increase in costs. Utility Model Content
[0004] In order to improve the above problems, the present application provides a conductive seal.
[0005] The conductive seal provided in this application adopts the following technical solution:
[0006] A conductive seal comprises a sealing body and a conductor, wherein the sealing body and the conductor are connected to each other and both the sealing body and the conductor are in contact with a rotating shaft and a bearing seat at the same time.
[0007] By adopting the above technical solution, the seal is located close to the bearing, the sealing body is responsible for oil sealing, and the conductor is responsible for allowing current to be transmitted between the rotating shaft and the bearing seat, reducing the current output of the rotating shaft to the bearing, thereby reducing electrical corrosion damage to the bearing.
[0008] Preferably, the conductor includes a metal conductive part and a contact conductive part, the metal conductive part and the contact conductive part are fixedly connected, the metal conductive part abuts against the bearing seat, the contact conductive part abuts against the side wall of the rotating shaft, and the material of the contact conductive part is conductive PTFE or conductive non-woven fabric.
[0009] By adopting the above technical solution, the metal conductive part is in contact with the bearing seat and is responsible for conducting electricity, but is not in direct contact with the rotating shaft. The contact conductive part made of PTFE material is in direct contact with the rotating shaft. While having the conductive function, it causes less friction damage to the rotating shaft and has higher durability.
[0010] Preferably, the sealing body includes a sealing rubber ring and a wear-resistant ring, the sealing rubber ring abuts against the bearing seat, and the wear-resistant ring abuts against the side wall of the rotating shaft.
[0011] Preferably, the sealing body further comprises a supporting skeleton ring, and the supporting skeleton ring is embedded in the sealing rubber ring.
[0012] By adopting the above technical solution, the supporting skeleton ring improves the structural stability of the sealing body and the ability of the sealing body to resist large-size deformation, thereby improving the sealing durability of the sealing body to the rotating shaft.
[0013] Preferably, a plurality of clamping blocks are fixedly connected to the sealing rubber ring, and the plurality of clamping blocks are arranged along the circumference of the sealing rubber ring. A mounting groove is formed between the clamping block and the sealing rubber ring, and the notch of the mounting groove is perpendicular to the axial direction of the rotating shaft, and the wear-resistant ring is embedded in the mounting groove.
[0014] By adopting the above technical solution, the installation groove provides a coaxial installation basis for the wear-resistant ring relative to the support skeleton ring and the sealing rubber ring, thereby improving the coaxiality among the support skeleton ring, the sealing rubber ring and the wear-resistant ring.
[0015] Preferably, a thread groove is provided on a side of the wear-resistant ring facing the rotating shaft, and along the direction close to the bearing, the rotation direction of the thread groove is consistent with the rotation direction of the rotating shaft.
[0016] By adopting the above technical solution, even when the oil inside the seal flows into the thread groove, the rotation of the shaft can play a certain driving role on the oil in the thread groove, prompting the oil therein to flow back to the inside of the seal.
[0017] Preferably, a positioning groove is formed between the sealing rubber ring and the metal conductive part, the contact conductive part is embedded in the positioning groove, and a friction edge is integrally formed on the side of the sealing rubber ring facing the positioning groove.
[0018] Preferably, the conductive contact portion is annular and coaxial with the rotating shaft, the side of the conductive contact portion facing the rotating shaft is inclined toward the installation direction of the rotating shaft, and a plurality of force-reducing notches are provided at the portion where the conductive contact portion abuts the rotating shaft.
[0019] By adopting the above technical solution, the presence of the force-reducing notch enables the inner side of the contact conductive part to have a more sensitive deformation ability, reduces the holding force of the contact conductive part on the rotating shaft, reduces wear, and prolongs the retention time of the conductive path.
[0020] In summary, this application includes at least one of the following beneficial technical effects:
[0021] 1. Through the arrangement of the sealing body and the conductor, the seal is located close to the bearing. The sealing body is responsible for oil sealing, and the conductor is responsible for transmitting current between the rotating shaft and the bearing seat, reducing the current output of the rotating shaft to the bearing, thereby reducing the electrical corrosion damage to the bearing;
[0022] 2. Through the setting of the metal conductive part and the contact conductive part, the metal conductive part is in contact with the bearing seat and is responsible for conducting electricity, but does not directly contact the rotating shaft. The contact conductive part made of PTFE material is in direct contact with the rotating shaft. While having the conductive function, it causes less friction damage to the rotating shaft and has higher durability. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a schematic cross-sectional view of the structure of the conductive seal in the embodiment of the present application.
[0024] Figure 2 It is a schematic diagram of the overall structure of the conductive seal in the embodiment of the present application.
[0025] Explanation of the accompanying reference numerals: 1. Sealing body; 11. Sealing rubber ring; 111. Friction edge; 112. Clamping block; 113. Mounting groove; 12. Wear-resistant ring; 121. Threaded groove; 2. Conductor; 21. Metal conductive part; 22. Contact conductive part; 223. Force-reducing notch; 3. Support skeleton ring; 4. Positioning groove; 5. Rotating shaft; 51. Bearing seat. DETAILED DESCRIPTION
[0026] The following is combined with Figure 1-2 This application is described in further detail.
[0027] The present application embodiment discloses a conductive seal, such as Figure 1 and 2 As shown, the seal comprises a sealing body 1 and a conductive body 2. Both sealing body 1 and conductive body 2 are annular and coaxially fixedly connected to each other. The inner edges of the sealing body 1 and conductive body 2 abut the rotating shaft 5, and the outer edges abut the bearing seat 51. The sealing body 1 is responsible for oil sealing the end of the rotating shaft 5, and the conductive body 2 is responsible for forming a current path between the rotating shaft 5 and the bearing seat 51.
[0028] like Figure 1 and 2 As shown, the conductor 2 includes a metal conductive part 21 and a contact conductive part 22 fixedly connected to each other, both of which are annular and coaxial with the rotating shaft 5. The metal conductive part 21 is located on the outside and abuts against the bearing seat 51, and the contact conductive part 22 is located on the inside and abuts against the side wall of the rotating shaft 5. The contact conductive part 22 is inclined towards the installation direction of the rotating shaft 5 on one side of the rotating shaft 5, which is convenient for the rotating shaft 5 to penetrate. The part where the contact conductive part 22 abuts against the rotating shaft 5 is provided with four force-reducing notches 223. The existence of the force-reducing notches 223 makes the inside of the contact conductive part 22 have a more sensitive deformation ability, reduces the holding force of the contact conductive part 22 on the rotating shaft 5, reduces wear, and prolongs the holding time of the conductive path. The material of the contact conductive part 22 can be selected from conductive PTFE or conductive non-woven fabric, and the material of the metal conductive part 21 can be selected from SUS304 stainless steel.
[0029] like Figure 1 and 2 As shown, the seal body 1 includes a sealing rubber ring 11 and a wear-resistant ring 12, which are fixedly connected to each other. Both are annular and coaxial with the rotating shaft 5. The sealing rubber ring 11 is located on the outside and abuts the bearing seat 51, while the wear-resistant ring 12 is located on the inside and abuts the side wall of the rotating shaft 5. The inner edge of the wear-resistant ring 12 is also inclined toward the side of the rotating shaft 5, in the direction of installation of the rotating shaft 5, so that this part has a tubular shape. The wear-resistant ring 12 has a threaded groove 121 on the side facing the rotating shaft 5. The cross-section of the threaded groove 121 can be V-shaped, U-shaped, or trapezoidal. In the direction close to the bearing, the rotation direction of the threaded groove 121 is consistent with the rotation direction of the rotating shaft 5. Therefore, even if oil inside the seal flows into the threaded groove 121, the rotating shaft 5 can play a certain role in driving the oil in the threaded groove 121, causing the oil in the threaded groove 121 to flow back to the inside of the seal. The wear-resistant ring 12 is made of wear-resistant PTFE.
[0030] like Figure 1 and 2 As shown, a positioning groove 4 is formed between the sealing rubber ring 11 and the metal conductive part 21. The notch of the positioning groove 4 is perpendicular to the axis of the rotating shaft 5. The outer ring edge of the contact conductive part 22 is embedded in the positioning groove 4. A friction ridge 111 is integrally formed on the side of the sealing rubber ring 11 facing the positioning groove 4. The tip of the friction ridge 111 abuts against the contact conductive part 22 to increase the friction force thereon.
[0031] like Figure 1 and 2 As shown, to improve the structural stability of the sealing body 1, the sealing body 1 also includes a support skeleton ring 3, which is embedded in the sealing rubber ring 11 and is made of SPCC, a material with high rigidity. The sealing rubber ring 11 is integrally formed with multiple clamping blocks 112, each of which is arranged in a circumferential array along the sealing rubber ring 11. A mounting groove 113 is formed between the clamping blocks 112 on the side facing the support skeleton and the sealing rubber ring 11. The notch of the mounting groove 113 is perpendicular to the axial direction of the rotating shaft 5. The outer ring edge of the wear-resistant ring 12 is embedded in the mounting groove 113. The sealing rubber ring 11 is vulcanized, and the mounting groove 113 tightly wraps and secures the wear-resistant ring 12.
[0032] The implementation principle of a conductive seal in the embodiment of the present application is as follows:
[0033] The seal is mounted on the end of the rotating shaft 5 and close to the bearing to realize oil sealing on the shaft end. The seal body 1 ensures the sealing performance. The conductor 2 forms a current path between the rotating shaft 5 and the bearing seat 51, and leads the voltage on the rotating shaft 5 to the bearing seat 51, thereby reducing the impact of the current on the bearing, thereby reducing the electrical corrosion damage to the bearing.
[0034] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A conductive seal, characterized in that: The invention comprises a sealing body (1) and a conductive body (2), wherein the sealing body (1) and the conductive body (2) are connected to each other, and the sealing body (1) and the conductive body (2) are both in contact with the rotating shaft (5) and the bearing seat (51); The conductor (2) comprises a metal conductive part (21) and a contact conductive part (22); the metal conductive part (21) and the contact conductive part (22) are fixedly connected; the metal conductive part (21) abuts against the bearing seat (51); the contact conductive part (22) abuts against the side wall of the rotating shaft (5); and the contact conductive part (22) is made of conductive PTFE or conductive non-woven fabric.
2. A conductive seal according to claim 1, characterized in that: The sealing body (1) comprises a sealing rubber ring (11) and a wear-resistant ring (12); the sealing rubber ring (11) abuts against the bearing seat (51); and the wear-resistant ring (12) abuts against the side wall of the rotating shaft (5).
3. A conductive seal according to claim 2, characterized in that: The sealing body (1) further comprises a supporting skeleton ring (3), wherein the supporting skeleton ring (3) is embedded in the sealing rubber ring (11).
4. A conductive seal according to claim 3, characterized in that: A plurality of clamping blocks (112) are fixedly connected to the sealing rubber ring (11), and the plurality of clamping blocks (112) are arranged along the circumference of the sealing rubber ring (11). A mounting groove (113) is formed between the clamping blocks (112) and the sealing rubber ring (11), and the notch of the mounting groove (113) is perpendicular to the axial direction of the rotating shaft (5), and the wear-resistant ring (12) is embedded in the mounting groove (113).
5. A conductive seal according to any one of claims 2 to 4, characterized in that: A thread groove (121) is provided on one side of the wear-resistant ring (12) facing the rotating shaft (5). In the direction close to the bearing, the rotation direction of the thread groove (121) is consistent with the rotation direction of the rotating shaft (5).
6. A conductive seal according to any one of claims 2 to 4, characterized in that: A positioning groove (4) is formed between the sealing rubber ring (11) and the metal conductive part (21), the contact conductive part (22) is embedded in the positioning groove (4), and a friction edge (111) is integrally formed on one side of the sealing rubber ring (11) facing the positioning groove (4).
7. A conductive seal according to any one of claims 1 to 4, characterized in that: The contact conductive portion (22) is annular and coaxial with the rotating shaft (5). The side of the contact conductive portion (22) facing the rotating shaft (5) is inclined toward the installation direction of the rotating shaft (5). The portion where the contact conductive portion (22) and the rotating shaft (5) abut is provided with a plurality of force-reducing notches (223).