New energy automobile driving motor conducting ring assembly structure
By adopting a conductive ring assembly structure, the problem of electrical corrosion in the bearings of drive motors in new energy vehicles has been solved, improving the reliability and durability of the motor, simplifying the assembly process, and reducing costs.
Patent Information
- Application Number
- CN202423082190.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-13
AI Technical Summary
In existing technologies, the bearings of drive motors in new energy vehicles are susceptible to electro-corrosion, which can lead to bearing damage, affecting the reliability and stability of the motor. Furthermore, existing improvement measures are costly or involve complex processes.
The structure employs a conductive ring assembly, including a cover plate frame, bolt columns, conductive ring brackets, a dummy shaft, and conductive rings. The motor rotor is connected to the motor housing via bolts, forming a current path. This achieves the connection between the motor shaft and the motor housing, preventing the formation of a current path between the shaft, bearing, and housing, thus protecting the bearing.
It achieves protection of motor bearings, improves motor reliability and durability, simplifies assembly process, adapts to different shaft diameters, and reduces costs.
Smart Images
Figure CN223639117U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to new energy automobile drive motor technical field especially, it is a kind of new energy automobile drive motor conducting ring subassembly structure. BACKGROUND
[0002] With the continuous development of new energy vehicles, the reliability of new energy vehicle drive motor is also increasingly high, with the continuous improvement of voltage platform, the probability of motor bearing electric corrosion that follows will greatly increase, and bearing electric corrosion is caused by the shaft voltage of motor. The shaft voltage is the potential difference between the two ends of the motor shaft or between the shaft and the bearing, and the shaft current is the loop formed by the shaft neck, oil film, bearing, base and base bottom. When the oil film is damaged, an electric current is generated in the loop. Since the bearing ball and raceway are point contact, the discharge current density is large, and instantaneous discharge occurs between the bearing ball and raceway, forming an electric spark, which produces high temperature and causes the surface of the raceway and the ball to be burned, resulting in pitting and grooves on the raceway / ball ring. Long-term such will form a washboard pattern in the raceway, and the oil in the bearing will also be damaged, which will cause the bearing to be damaged and the motor to malfunction, resulting in great economic loss. Therefore, the motor shaft voltage problem must be paid enough attention to.
[0003] Current motor shaft voltage improvement measures are mainly:
[0004] 1. Take insulation measures to block the path between the shaft, bearing and end cover.
[0005] 2. Use a conductive measure to conduct the shaft current on the shaft to the end cover through other paths, thereby protecting the bearing.
[0006] 3. Use a block and a through measure, that is, take a scheme of one end insulation and one end conduction at both ends of the motor. This scheme can reduce the cost while ensuring the improvement of shaft current.
[0007] The main schemes of measure 1 are: 1) ceramic ball bearings are used at the front and rear ends of the motor, which can effectively block the passage between the shaft and the end cover, and avoid bearing damage caused by shaft current. The cost of this measure is relatively high. 2) Insulation measures are taken at the bearing position on the shaft to block the passage between the shaft and the inner ring of the bearing. The manufacturing and installation process of this scheme is relatively complex.
[0008] The main schemes of measure 2 are: taking a conductive measure at the front or rear end of the motor, mainly including conductive brush, conductive oil seal, graphite carbon brush and conductive grease. Through the conductive way, the current on the shaft can be conducted to the end cover. The durability of this measure needs to be verified.
[0009] The main scheme of measure 3 is: insulation measures are adopted at the output end of the motor, and conduction measures are adopted at the non-output end, which can reduce the cost compared with the measures of adopting insulation at both ends, and can also ensure good shaft current improvement purposes. SUMMARY
[0010] The utility model discloses a new energy automobile drive motor conducting ring assembly structure, be applicable to the scheme in measure 3.
[0011] The utility model discloses a new energy automobile drive motor conducting ring assembly structure, including cover frame, bolt column, conducting ring support, dummy shaft, conducting ring and rear cover plate, the cover frame is annular structure, and coaxial setting is in the cover plate outside, in the space that cover frame surrounds, bolt column is established between conducting ring support with the end cover, and the first bolt fastening conducting ring support is on bolt column, and the conducting ring is fixed on conducting ring support through third bolt, and the dummy shaft is fixed in the end of rotating shaft through the second bolt of its center, and the dummy shaft is in contact with the inside metal fibre of conducting ring, and the rear cover plate is fixed at the opening of cover frame, and makes the inside of cover frame form sealed structure.
[0012] Further, the conducting ring support is a central symmetric structure, which has four symmetric fixing feet extending outward, and bolt holes are formed in the fixing feet; a central hole is formed in the center of the conducting ring support, and a plurality of conducting ring positioning holes are formed around the central hole.
[0013] Further, the conducting ring has conducting ring fixing holes corresponding to the conducting ring positioning holes.
[0014] The utility model has the advantages of:
[0015] 1. The utility model has simple assembly process, and can be reliably connected through bolts, meeting the requirements of motor vibration;
[0016] 2. The conducting ring wire harness can fully contact the motor rotating shaft (dummy shaft), so that the rotating shaft and the motor shell form a passage, and the motor has good shaft voltage / axle current conduction effect during normal operation;
[0017] 3. Compared with the traditional scheme, the utility model has good durability and can effectively improve the reliability of the motor. DRAWINGS
[0018] Figure 1 It is the structure explosion map of the utility model;
[0019] Figure 2 It is the structure schematic view of the end cover in the utility model;
[0020] Figure 3It is the structure schematic view of the bolt column in the utility model.
[0021] Figure 4 It is the structure schematic view of the conductive ring support in the utility model.
[0022] Figure 5 It is the structure schematic view of the dummy shaft in the utility model.
[0023] Figure 6 It is the structure schematic view of the conductive ring in the utility model.
[0024] Figure 7 It is the structure schematic view of the rear cover plate in the utility model.
[0025] In the drawing: 1 - end cover, 2 - bolt column, 3 - first bolt, 4 - conductive ring support, 41 - fixed foot, 42 - conductive ring positioning hole, 43 - center hole, 5 - second bolt, 6 - dummy shaft, 7 - third bolt, 8 - conductive ring, 81 - conductive ring fixing hole, 9 - rear cover plate, 10 - rotating shaft, 11 - cover plate frame. DETAILED DESCRIPTION
[0026] The utility model will be further explained in connection with the drawings.
[0027] As Figure 1 , Figure 2 and Figure 7 indicated, the utility model is a new energy automobile drive motor conductive ring assembly structure, including cover plate frame 11, bolt column 2, conductive ring support 4, dummy shaft 6 and conductive ring 8, cover plate frame 11 is annular, sets up the side surface of the end cover 1 outside drive motor, and is sealed by rear cover plate 9;Bolt column 2, conductive ring support 4, dummy shaft 6 and conductive ring 8 are arranged in the airtight space surrounded by end cover 1, cover plate frame 11 and rear cover plate 9.
[0028] As Figure 3 and Figure 4 indicated, four bolt columns 2 are tightly fixed on end cover 1.The center of conductive ring support 4 is provided with center hole 43, and four symmetrical fixed feet 41 extend outward around, and bolt holes are formed in four fixed feet 41, and the whole is a central symmetrical structure.The lower portion of four fixed feet 41 corresponds with bolt column 2, and conductive ring support 4 is connected with bolt column 2 by first bolt 3.Four conductive ring positioning holes 42 are symmetrically distributed around center hole 43 on conductive ring support 4, and are used to be connected with conductive ring 8.
[0029] As Figure 5 and Figure 6As shown, four conductive ring fixing holes 81 are correspondingly formed on the conductive ring 8, and the third bolt 7 passes through the conductive ring positioning hole 81 to fix the conductive ring 8 on the conductive ring support 4, at this time, the conductive ring 8 is coaxial with the rotating shaft 10. One end of the rotating shaft 10 of the driving motor passes through the center hole 43 of the end cover 1 and the conductive ring support 4, and the dummy shaft 6 is fixed on the end of the rotating shaft 10 by the second bolt 5 and is in contact with the metal fiber inside the conductive ring 8; or a lengthened rotating shaft 10 is used instead of the dummy shaft 6, so that the material can be reduced.
[0030] The bolt needs to be tightened according to proper torque in the assembling process of the utility model, so that bolt damage caused by excessive torque and bolt connection failure caused by too small torque can be prevented.
[0031] The conductive ring assembly can conduct the motor rotating shaft and the shell, form a current path, conduct the shaft current to the shell through the dummy shaft-conductive ring-end cover path, form grounding, avoid forming a path among the rotating shaft-bearing-shell, and effectively protect the motor bearing.
[0032] The utility model can satisfy most motor to solve the bearing corrosion caused by shaft voltage / current, does not limit the front and rear end position of motor, can be suitable for different shaft diameter's conductive ring. The conductive ring has higher service life and durability, can protect the motor bearing for a long time, thereby improving the stability of motor operation.
Claims
1. A new energy automobile drive motor conducting ring assembly structure, comprising a cover plate frame, a bolt column, a conducting ring support, a dummy shaft, a conducting ring and a rear cover plate; characterized in that: The cover plate frame is an annular structure coaxially arranged outside the cover plate; a bolt column is arranged between the conductive ring support and the end cover in the space surrounded by the cover plate frame, a first bolt is used to fasten the conductive ring support on the bolt column; the conductive ring is fixed on the conductive ring support through a third bolt; the dummy shaft is fixed on the end of the rotating shaft through a second bolt in the center of the dummy shaft, the dummy shaft is in contact with the metal fibers inside the conductive ring; the rear cover plate is fixed at the opening of the cover plate frame, so that the inside of the cover plate frame forms a closed structure.
2. The electrically conductive ring assembly structure of a drive motor of a new energy vehicle according to claim 1, characterized in that: The conductive ring support is a central symmetric structure, four symmetric fixing feet are extended outwardly, bolt holes are formed in the fixing feet; a central hole is formed in the center of the conductive ring support, a plurality of conductive ring positioning holes are formed around the central hole.
3. The new energy vehicle drive motor conducting ring assembly structure according to claim 1, characterized in that: The conductive ring is provided with conductive ring fixing holes corresponding to the conductive ring positioning holes.