CN-224218184-U - Current corrosion prevention structure of electric drive assembly bearing

CN224218184UCN 224218184 UCN224218184 UCN 224218184UCN-224218184-U

Abstract

The utility model belongs to the technical field of electric driving, and particularly relates to a current corrosion prevention structure of an electric driving assembly bearing, which comprises an insulating cover and a conductive component, wherein the insulating cover is arranged on the inner side of a bearing installation area in one end of the electric driving assembly, a bearing in the one end of the electric driving assembly is arranged in the insulating cover, a through hole for a power driving rotating shaft to pass through is formed in the end part of the insulating cover, a threaded hole is formed in the end face of a shell at the other end of the electric driving assembly, the conductive component comprises a cylinder and conductive fibers, an external thread is formed in the side face of one end of the cylinder, the conductive fibers are arranged at the other end of the cylinder, the cylinder is in threaded connection with the threaded hole, one end of the cylinder provided with the conductive fibers is positioned in the other end of the electric driving assembly, and the conductive fibers are in contact with the electric driving rotating shaft. The mode that one end separation other end switched on has been formed, protects the electricity better and drives assembly bearing, prolongs its life, and the cost is lower relatively, and conductive component installs firmly reliable and be convenient for change, can reduce the maintenance degree of difficulty and cost of labor.

Inventors

An Jintao
LU FANGJUN
CHEN HUI
CHEN ZHICHU
TANG XIONGHUI

Assignees

无锡中车时代电驱科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250528

Claims (10)

1. The utility model provides an electric drive assembly bearing prevents electric current corrosion structure, its characterized in that includes insulating boot (1) and conductive component (2), insulating boot (1) set up the inboard at the inside bearing installation district of electric drive assembly (100) one end, and the inside bearing setting of this one end of electric drive assembly (100) is inside insulating boot (1), and the through-hole (121) that the power supply driven the pivot to pass have been seted up to the tip of insulating boot (1), the casing terminal surface of the other end of electric drive assembly (100) is provided with screw hole (101), conductive component (2) include cylinder (21) and conductive fiber (22), cylinder (21) one end side is provided with external screw thread (211), and conductive fiber (22) set up the other end at cylinder (21), cylinder (21) and screw hole (101) threaded connection, and cylinder (21) are equipped with the one end of conductive fiber (22) and are located the inside of this other end of electric drive assembly (100), and conductive fiber (22) and electric drive the pivot contact.
2. The electric drive assembly bearing current corrosion prevention structure according to claim 1, wherein the conductive fiber (22) is arranged on the side surface of the other end of the column body (21), one end of the electric drive rotating shaft, which is away from the insulating cover (1), is arranged in a hollow mode, one end of the column body (21), which is provided with the conductive fiber (22), is arranged in the hollow mode of the electric drive rotating shaft in a penetrating mode, and the conductive fiber (22) is in contact with the inner wall of the electric drive rotating shaft.
3. An electro-drive assembly bearing galvanic corrosion protection structure according to claim 2, wherein the conductive fibres (22) have bundles of conductive fibres (22) arranged at circumferentially and/or axially spaced apart positions laterally of the cylinder (21).
4. A structure for preventing corrosion of bearing of electric drive assembly according to any one of claims 1-3, characterized in that a limit table (23) is arranged at one end of the cylinder (21) provided with external screw thread (211), the width or diameter of the limit table (23) is larger than the diameter of the cylinder (21), and after the cylinder (21) is in threaded connection with the screw hole (101), the limit table (23) is located outside the casing of the electric drive assembly (100).
5. The structure for preventing corrosion of bearings of electric drive assemblies according to claim 4, wherein the middle part of the limiting table (23) is provided with a hexagonal hole (231), or the limiting table (23) is hexagonal.
6. The structure for preventing corrosion of electric drive assembly bearing according to claim 4, further comprising a sealing ring, wherein an annular groove is arranged on one surface of the limiting table (23) facing the electric drive assembly (100) shell, and the sealing ring is arranged in the annular groove and is abutted against the electric drive assembly (100) shell.
7. The structure for preventing current corrosion of an electric drive assembly bearing according to any one of claims 1 to 3, 5 and 6, further comprising a wave spring, wherein the wave spring is positioned inside the insulating cover (1), and the wave spring is sleeved on the motor rotating shaft and is in contact with the end face of the outer ring of the bearing positioned inside the insulating cover (1).
8. An electric drive assembly bearing current corrosion prevention structure as claimed in any one of claims 1-3, 5, 6, wherein the insulating cover (1) comprises an insulating ring (11) and an insulating plate (12), the insulating plate (12) is arranged at one end of the insulating ring (11), and the through hole (121) is formed in the middle of the insulating plate (12).
9. The structure for preventing current corrosion of an electric drive assembly bearing according to claim 8, wherein a fixing plate (13) is arranged on a side surface of one end of the insulating ring (11) facing away from the insulating plate (12), and a fixing hole (131) is formed in the fixing plate (13).
10. The structure for preventing corrosion of bearings for electric drive assemblies according to claim 9, characterized in that said fixing plates (13) are symmetrically arranged in two along the axis of the insulating ring (11).

Description

Current corrosion prevention structure of electric drive assembly bearing Technical Field The utility model belongs to the technical field of electric drive, and particularly relates to a current corrosion prevention structure of an electric drive assembly bearing. Background Most of the current new energy vehicles adopt an electric drive assembly as a drive device, however, as the voltage of an electric drive platform is increased and the switching frequency of a controller is increased, the NVH and reliability problems caused by shaft current corrosion of a motor bearing are increasingly focused in the industry. In the prior art, a ceramic ball bearing is generally used to block a shaft current flow path and/or bypass current by arranging a conductive member so as to avoid or reduce the influence of shaft current on an electric drive system bearing. However, the ceramic ball bearing has the problem of high cost, is unfavorable for controlling the manufacturing cost of the electric drive assembly, and the conductive piece and the motor shaft form rolling contact, so that the contact resistance between the conductive piece and the motor shaft is increased due to the increase of the abrasion loss after long-time use, thereby influencing the conductive effect, and the conductive piece needs to be replaced regularly. Disclosure of utility model The utility model aims to provide the current corrosion prevention structure of the electric drive assembly bearing, which can better protect the electric drive assembly bearing, prolong the service life of the electric drive assembly bearing, has relatively lower cost, is stable and reliable in installation of the conductive component, is convenient to replace and can reduce the maintenance difficulty and the labor cost. The electric drive assembly comprises an insulating cover and a conductive component, wherein the insulating cover is arranged on the inner side of a bearing installation area in one end of the electric drive assembly, a bearing in the one end of the electric drive assembly is arranged in the insulating cover, a through hole for a power drive rotating shaft to pass through is formed in the end part of the insulating cover, a threaded hole is formed in the end face of a shell at the other end of the electric drive assembly, the conductive component comprises a cylinder and conductive fibers, external threads are formed in the side face of one end of the cylinder, the conductive fibers are arranged at the other end of the cylinder, the cylinder is in threaded connection with the threaded hole, one end of the cylinder, provided with the conductive fibers, is positioned in the other end of the electric drive assembly, and the conductive fibers are in contact with the electric drive rotating shaft. Still further, conductive fiber sets up in the other end side of cylinder, the one end cavity setting that the electricity driven shaft deviates from the insulating boot, and the cylinder is equipped with conductive fiber's one end and wears to establish in the one end inside that the electricity driven shaft cavity set up, and conductive fiber and the inner wall contact of electricity driven shaft. Still further, the conductive fibers have bundles of conductive fibers circumferentially and/or axially spaced at the sides of the cylinder. Still further, the one end tip that the cylinder was equipped with the external screw thread is provided with spacing platform, and spacing platform width or diameter are greater than the cylinder diameter, post and screw hole threaded connection back, spacing platform is located the electricity and drives assembly casing outside. Furthermore, the middle part of the limiting table is provided with an inner hexagonal hole, or the limiting table is hexagonal. Still further still include the sealing washer, the limit station is provided with the ring channel towards the one side of electric drive assembly casing, the sealing washer sets up in the ring channel and with electric drive assembly casing butt. Still further still include wave spring, wave spring is located inside the insulating boot, wave spring cover is established on the motor shaft and is contacted with the outer lane terminal surface of the bearing that is located inside the insulating boot. Still further, the insulating boot includes insulating ring and insulation board, the insulation board sets up the one end at the insulating ring, the through-hole is seted up at the middle part of insulation board. Further, a fixing plate is arranged on the side face of one end, away from the insulating plate, of the insulating ring, and fixing holes are formed in the fixing plate. Further, the fixing plates are symmetrically arranged in two along the axis of the insulating ring. The utility model has the beneficial effects that one end of the electric drive assembly, which is internally provided with the insulating cover, can effectively block shaft current to form a closed loop