Shaft current grounding carbon brush assembly for automobile high-voltage driving motor

Abstract

The utility model discloses a shaft current grounding carbon brush assembly for an automobile high-voltage driving motor, which relates to the field of motor driving assemblies, and comprises a mounting cover, a plurality of sealing rings are arranged on the outer wall of the mounting cover, a carbon brush cover is movably arranged in the mounting cover, a shaft seal is arranged in the carbon brush cover, and the shaft seal is arranged in the carbon brush cover. One side of the mounting cover is fixedly connected with a mounting shell, and the inner wall of the mounting shell is provided with a grounding carbon brush structure. According to the utility model, the plurality of sealing rings are arranged between the installation cover and the motor casing, the sealing rings can seal the installation cover and the motor casing after the installation cover is inserted into the motor casing, and the shaft seal is arranged between the carbon brush cover and the speed reducer shaft and seals the speed reducer shaft and the carbon brush cover. The sealing ring and the shaft seal can directly play a sealing role in the installation process, and compared with a traditional carbon brush assembly which needs to be provided with an additional sealing mechanism after installation, the cost of the sealing ring and the shaft seal is lower, and the installation speed is higher.

Description

Technical Field

[0001] The utility model relates to the field of motor drive assemblies, and particularly to a shaft current grounding carbon brush assembly for an automotive high-voltage drive motor. Background Technique

[0002] Modern new energy high-voltage drive motors for vehicles are generally permanent magnet synchronous motors with special high-voltage control circuits. Based on the working principle of the control circuit, a certain shaft voltage will be generated between the rotating shaft of the motor and the motor housing (ground) during the operation of the motor. The shaft voltage will form a loop through the rotating shaft, bearings, motor housing, etc. and generate shaft current in the loop. The shaft current will cause irreversible damage to the bearing raceways, steel balls, etc., resulting in premature failure of the bearings such as abnormal noise. Bearing failures caused by shaft current account for a relatively large proportion of current vehicle drive motors. Moreover, with the continuous increase of the motor voltage and speed, the shaft voltage is getting larger and larger, and more effective, reliable and economical technical solutions are needed to solve this problem.

[0003] Currently, several mainstream shaft current technical solutions include carbon fiber rings (refer to the background patent "Slip Ring and Motor", application publication number: CN218386131U); conductive bearings (refer to the background patent "Motor Rotor, Motor and Vehicle", application publication number: CN112701824 A); and carbon brush / carbon rod structures (refer to the background patent "Carbon Brush Assembly for Shaft Current Grounding of Motor and Its Installation Structure", application publication number: CN11614191A). Among these methods, when comparing from the aspects of cost, structural complexity, reliability, etc., the carbon brush / carbon rod structure has advantages in terms of cost, maintenance, reliability, etc., but there are still certain disadvantages.

[0004] Currently, the carbon brush assembly is installed inside the motor and requires an external sealing structure (cover, sealing ring, etc.) to seal and protect the components. The overall installation is relatively complex and increases the cost. Content of the Utility Model

[0005] Based on this, the purpose of the utility model is to provide a shaft current grounding carbon brush assembly for an automotive high-voltage drive motor, so as to solve the technical problems that the existing carbon brush assembly is installed inside the motor and requires the installation of an external sealing structure, which is time-consuming, laborious and costly.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A shaft current grounding carbon brush assembly for an automotive high-voltage drive motor, including an installation cover, the outer wall of the installation cover is provided with a plurality of sealing rings, a carbon brush cover is movably arranged inside the installation cover, a shaft seal is arranged inside the carbon brush cover, one side of the installation cover is fixedly connected with an installation shell, and a grounding carbon brush structure is installed on the inner wall of the installation shell.

[0007] The present utility model is further configured such that the grounding carbon brush structure includes a carbon rod, a spring, a sleeve, and a braided wire. A braided wire is disposed at the brush cover on the inner side wall of the mounting shell, and one end of the braided wire is connected to a carbon rod.

[0008] The present utility model is further configured such that a sleeve is sleeved on the outer wall of the braided wire, a spring is sleeved on the outer wall of the sleeve, one ends of the sleeve and the spring are mounted on one side of the mounting seat inside the mounting shell, and one end of the spring is connected to the side wall of the carbon rod.

[0009] The present utility model is further configured such that structural adhesive is filled at the brush cover of the braided wire and the mounting shell.

[0010] The present utility model is further configured such that a clamping block is disposed on the outer wall of the mounting shell, a groove is formed on the outer wall of the carbon brush cover, and the clamping block and the groove cooperate with each other.

[0011] In summary, the present utility model mainly has the following beneficial effects: By arranging a plurality of sealing rings between the mounting cover and the motor housing, the sealing rings can seal between the mounting cover and the motor housing after the mounting cover is inserted into the motor housing, and a shaft seal is arranged between the carbon brush cover and the reducer shaft to seal between the reducer shaft and the carbon brush cover. The sealing rings and the shaft seal can directly play a sealing role during the installation process. Compared with the traditional carbon brush assembly that requires an additional sealing mechanism to be installed after installation, the sealing rings and the shaft seal have lower costs and faster installation speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic external structure diagram of the motor housing of the present utility model;

[0013] Figure 2 is a schematic installation diagram of the mounting cover and the reducer shaft of the present utility model;

[0014] Figure 3 is a schematic internal structure diagram of the mounting cover of the present utility model

[0015] Figure 4 is a schematic structure diagram of the unmounted state of the carbon brush cover and the mounting shell of the present utility model;

[0016] Figure 5 is a schematic structure diagram of the mounted state of the carbon brush cover and the mounting shell of the present utility model.

[0017] In the figure: 1, motor housing; 2, mounting cover; 3, reducer shaft; 4, sealing ring; 5, carbon brush cover; 6, mounting shell; 7, carbon rod; 8, spring; 9, sleeve; 10, braided wire; 11, shaft seal; 12, groove; 13, clamping block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0019] An axial current grounding carbon brush assembly for an automotive high-voltage drive motor, as Figures 1-5 shown, includes a mounting cover 2, which is mounted on the outer drive end of the motor housing 1. When the mounting cover 2 is inserted into the motor housing 1 and detachably connected by bolts, a plurality of sealing rings 4 provided at the contact position between the outer wall of the mounting cover 2 and the motor housing 1 seal between the mounting cover 2 and the motor housing 1.

[0020] After the mounting cover 2 is inserted into the outer drive end of the motor housing 1, a carbon brush cover 5 movably arranged inside the mounting cover 2 is pushed up by the reducer shaft 3 inside the motor housing 1. At this time, a shaft seal 11 is provided between the carbon brush cover 5 and the reducer shaft 3 to seal between the reducer shaft 3 and the carbon brush cover 5;

[0021] Furthermore, the mounting cover 2 is not limited to being mounted on the outer drive end of the motor, and can also be mounted on the non-drive end side of the motor.

[0022] Through the sealing ring 4 and the shaft seal 11, the mounting cover 2 can be effectively sealed, and the installation is more convenient and fast, and the cost is lower.

[0023] One side of the mounting cover 2 is fixedly connected with a mounting shell 6. The inner wall of the mounting shell 6 is provided with a grounding carbon brush structure. The grounding carbon brush structure includes a carbon rod 7, a spring 8, a sleeve 9 and a braided wire 10. The braided wire 10 is provided at the brush cover of the inner side wall of the mounting shell 6. One end of the braided wire 10 is connected with a carbon rod 7. The outer wall of the braided wire 10 is sleeved with a sleeve 9, and the outer wall of the sleeve 9 is sleeved with a spring 8. One ends of the sleeve 9 and the spring 8 are mounted on one side of the mounting seat inside the mounting shell 6, and one end of the spring 8 is connected with the side wall of the carbon rod 7. When the mounting cover 2 moves downward, the carbon brush cover 5 is pushed up by the reducer shaft 3. A clamping block 13 is provided on the outer wall of the mounting shell 6, and a groove 12 is opened on the outer wall of the carbon brush cover 5, and the clamping block 13 and the groove 12 cooperate with each other. The clamping block 13 will be stuck into the groove 12, and the groove 12 fixes the clamping block 13. The groove 12 and the clamping block 13 are in interference fit. After the carbon brush cover 5 is stuck into the mounting shell 6, the spring 8 pushes the carbon rod 7 into the carbon brush cover 5. When installing, the operator does not need to contact the grounding carbon brush structure. When the assembly is installed and the mounting cover 2 is pressed in place, the carbon rod 7 automatically pops out and contacts the reducer shaft 3, avoiding the hidden danger of failure caused by installation.

[0024] The braided wire 10 and the brush cover of the mounting shell 6 are filled with structural adhesive, and the structural adhesive can improve the sealing effect inside the mounting shell 6.

[0025] Although embodiments of the present utility model have been shown and described, the specific embodiments are only explanations of the present utility model and do not limit the utility model. The specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can make modifications, substitutions, and variations that do not contribute creatively to the embodiments as needed, but as long as they are within the scope of the claims of the present utility model, they are protected by the patent law.

Claims

1. An axial current grounding carbon brush assembly for a high-voltage drive motor of an automobile, comprising a mounting cover (2), characterized in that: A plurality of sealing rings (4) are provided on the outer wall of the mounting cover (2). A carbon brush cover (5) is movably arranged inside the mounting cover (2). A shaft seal (11) is arranged inside the carbon brush cover (5). One side of the mounting cover (2) is fixedly connected to a mounting shell (6). A grounding carbon brush structure is installed on the inner wall of the mounting shell (6).

2. The shaft current grounding carbon brush assembly for a high-voltage drive motor of an automobile according to claim 1, wherein: The grounding carbon brush structure includes a carbon rod (7), a spring (8), a sleeve (9) and a braided wire (10). A braided wire (10) is arranged at the brush cover on the inner side wall of the mounting shell (6). One end of the braided wire (10) is connected to a carbon rod (7).

3. The shaft current grounding carbon brush assembly for a high-voltage drive motor of an automobile according to claim 2, characterized in that: A sleeve (9) is sleeved on the outer wall of the braided wire (10). A spring (8) is sleeved on the outer wall of the sleeve (9). One ends of the sleeve (9) and the spring (8) are installed on one side of the mounting seat inside the mounting shell (6), and one end of the spring (8) is connected to the side wall of the carbon rod (7).

4. The shaft current grounding carbon brush assembly for a high-voltage drive motor of an automobile according to claim 2, characterized in that: The braided wire (10) and the brush cover of the mounting shell (6) are filled with structural adhesive.

5. The shaft current grounding carbon brush assembly for a high-voltage drive motor of an automobile according to claim 1, characterized in that: A clamping block (13) is arranged on the outer wall of the mounting shell (6). A groove (12) is formed on the outer wall of the carbon brush cover (5), and the clamping block (13) and the groove (12) cooperate with each other.

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