Grounding carbon brush holder of new energy electric drive system

Abstract

The utility model provides a grounding carbon brush holder of a new energy electric drive system, which comprises a mounting ring, a plurality of brush boxes are mounted on the side wall of the mounting ring, carbon brushes are slidably connected in the brush boxes, springs are mounted in the brush boxes, and two ends of the springs are fixedly connected with the brush boxes and the side walls of the carbon brushes respectively. The new energy electric drive system grounding carbon brush holder provided by the utility model has the advantages of effective oil film scratching, good conductive effect and long service life.

Description

Technical Field

[0001] This utility model relates to the field of new energy electric drive system technology, and in particular to a grounding carbon brush holder for a new energy electric drive system. Background Technology

[0002] In recent years, the new energy sector has developed rapidly, and the application of variable frequency motors has become increasingly widespread. With the continuous increase in motor power, the higher voltage platform often leads to higher shaft voltage. Furthermore, to adapt to high speeds, the viscosity of lubricating oil / grease decreases, resulting in a thinner oil film and poorer load-bearing capacity. Therefore, bearing electro-corrosion problems have become prominent in the past two years. Bearing electro-corrosion in motors is a key concern for OEMs recently.

[0003] A current Chinese patent document, CN218386131U, discloses a side-circuit conductive ring and a motor. It includes a conductive ring body and conductive fibers. The conductive ring body has radially opened fiber holes, and the conductive fibers are implanted within the fiber holes, with at least one end of the conductive fiber extending out of the fiber hole. A clamping portion is formed on the sidewall of the fiber hole, protruding into the fiber hole and abutting against the conductive fiber. The contact surface between the clamping portion and the conductive fiber is wavy. By pressing the conductive fiber radially into the clamping portion of the conductive ring body, the conductive fiber is securely installed within a limiting hole in the conductive ring body. The clamping portion acts on the undulating wavy contact surface of the conductive fiber, achieving a repeated tightening and loosening of the conductive fiber through multiple clamping and loosening processes.

[0004] This conductive ring uses carbon fiber as the conductive contact material, relying on the rigidity of the fiber itself to contact the shaft surface for friction. However, it is not sustainable, and the lifespan ends when the fiber's interference length is worn out. Furthermore, when the motor shaft is running at high speed, oil forms an oil film that the fiber cannot break through. Excessive oil volume can also wash away the fiber bundle, leading to conductive failure.

[0005] Therefore, it is necessary to provide a new type of grounding carbon brush holder for new energy electric drive systems to solve the above problems. Utility Model Content

[0006] The technical problem solved by this utility model is to provide a grounding carbon brush holder for a new energy electric drive system that effectively breaks through oil films, has good conductivity, and a long service life.

[0007] To solve the above-mentioned technical problems, the new energy electric drive system grounding carbon brush holder provided by this utility model includes: a mounting ring, a plurality of brush boxes installed on the side wall of the mounting ring, carbon brushes slidably connected inside the brush boxes, and springs installed inside the brush boxes, with the two ends of the springs respectively fixedly connected to the side walls of the brush boxes and the carbon brushes.

[0008] Preferably, the side wall of the brush box is fitted with multiple protrusions, which are inserted into the mounting ring and then riveted to fix the brush box to the side wall of the mounting ring.

[0009] Preferably, a plurality of brush boxes are evenly arranged on the surface of the mounting ring, and the number of brush boxes is 2 to 20.

[0010] Preferably, one end of the carbon brush is arc-shaped.

[0011] Preferably, the mounting ring internally engages with the bushing, and the surface of the bushing abuts against the sidewall of the carbon brush.

[0012] Compared with related technologies, the grounding carbon brush holder for the new energy electric drive system provided by this utility model has the following beneficial effects:

[0013] This utility model provides a grounding carbon brush holder for a new energy electric drive system. The mounting ring adopts a stamping structure with interference fit on the outer circle. The thickness of the mounting ring can be as small as 3mm, and the shaft diameter can be as small as 10mm, making it more adaptable. It does not require machining on turning or milling machines, and is formed in one stamping process. This device has a compact structure, occupies less space, and has a lower cost, making it suitable for new energy electric drive systems. During use, because the spring applies pressure to the carbon brush, the conductivity is more reliable. The contact surface between the carbon brush and the motor shaft is arc-shaped, resulting in lower contact resistance. The carbon brush can more effectively break through the oil film and maintain stable contact with the motor shaft. Furthermore, the spring conducts electricity, and the spring material is selected from conductive materials such as phosphor bronze, manganese steel, and stainless steel. The spring pushes the carbon brush to always be in contact with the motor shaft, giving the carbon brush sustainable wear characteristics and a longer service life. Moreover, the carbon brush is made of a rigid material, which allows the carbon brush to effectively break through the oil film without being pushed up by the oil film. The large contact surface makes the contact with the motor shaft more reliable. Attached Figure Description

[0014] Figure 1 A schematic diagram of a preferred embodiment of the grounding carbon brush holder for a new energy electric drive system provided by this utility model;

[0015] Figure 2 for Figure 1 The front view of the mounting ring structure shown;

[0016] Figure 3 for Figure 1 The side view of the mounting ring structure shown;

[0017] Figure 4 for Figure 1 The diagram shows the interior of the brush box;

[0018] Figure 5 for Figure 4 The diagram shows a schematic of a carbon brush structure.

[0019] The numbers in the diagram are: 1. Mounting ring, 2. Bushing, 3. Brush box, 4. Protrusion, 5. Carbon brush, 6. Spring. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Please see Figures 1 to 5 , Figure 1 A schematic diagram of a preferred embodiment of the grounding carbon brush holder for a new energy electric drive system provided by this utility model; Figure 2 for Figure 1 The front view of the mounting ring structure shown; Figure 3 for Figure 1 The side view of the mounting ring structure shown; Figure 4 for Figure 1 The diagram shows the internal structure of the brush box. Figure 5 for Figure 4 The diagram shows a schematic of the carbon brush structure. The grounding carbon brush holder for the new energy electric drive system includes: a mounting ring 1; multiple brush boxes 3 are mounted on the side wall of the mounting ring 1; carbon brushes 5 are slidably connected inside the brush boxes 3; and springs 6 are installed inside the brush boxes 3, with their two ends fixedly connected to the side walls of the brush boxes 3 and the carbon brushes 5, respectively. A bushing 2 engages inside the mounting ring 1, and the surface of the bushing 2 abuts against the side wall of the carbon brushes 5. The bushing 2 is secured inside the mounting ring 1 to prevent the springs 6 from pushing the carbon brushes 5 out. During installation, the mounting ring 1 is directly fitted onto the motor shaft. At this time, the bushing 2 is naturally pushed out by the motor shaft, and the springs 6 push the carbon brushes 5 to move and abut against the surface of the motor shaft, making installation convenient and quick.

[0022] Multiple protrusions 4 are installed on the side wall of the brush box 3. The protrusions 4 are inserted into the mounting ring 1 and then riveted to fix the brush box 3 to the side wall of the mounting ring 1, so as to facilitate fixing the brush box 3 to the surface of the mounting ring 1.

[0023] Multiple brush boxes 3 are evenly arranged on the surface of the mounting ring 1, and the number of brush boxes 3 is 2 to 20. In order to use multiple carbon brushes 5 to contact the surface of the motor shaft, improve the conductivity of the carbon brushes 5, and quickly draw away the circuit on the surface of the motor shaft.

[0024] One end of the carbon brush 5 is arc-shaped in order to increase the contact area between the carbon brush 5 and the motor shaft and improve the conductivity.

[0025] The working principle of the grounding carbon brush holder for the new energy electric drive system provided by this utility model is as follows: During installation, the mounting ring 1 is directly fitted onto the motor shaft. At this time, the bushing 2 is naturally pushed out by the motor shaft, and the spring 6 pushes the carbon brush 5 to move and contact the surface of the motor shaft, making the installation convenient and quick. The mounting ring 1 is installed on the grounding mechanism, and the spring 6 is electrically connected to the grounding mechanism. When the motor shaft rotates, the current generated by the motor shaft is introduced into the ground through the carbon brush 5, the spring 6, and the grounding mechanism. During use, the spring 6 applies pressure to the carbon brush 5, ensuring that the carbon brush 5 remains in constant contact with the motor shaft, resulting in stronger conductivity reliability. Furthermore, the arc-shaped contact surface between the carbon brush 5 and the motor shaft reduces contact resistance, allowing the carbon brush 5 to more effectively break through the oil film and maintain stable contact with the motor shaft. The spring 6 pushes the carbon brush 5 to remain in constant contact with the motor shaft, giving the carbon brush 5 sustainable wear characteristics and a longer service life. The rigid material of the carbon brush 5 ensures it can effectively break through the oil film without being lifted by it, and the relatively large contact surface further enhances the reliability of conductivity with the motor shaft.

[0026] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A grounding carbon brush holder for a new energy electric drive system, characterized in that, include: Mounting ring (1), multiple brush boxes (3) are mounted on the side wall of the mounting ring (1), carbon brushes (5) are slidably connected inside the brush box (3), and springs (6) are installed inside the brush box (3). The two ends of the springs (6) are respectively fixedly connected to the side walls of the brush box (3) and the carbon brushes (5).

2. The grounding carbon brush holder for the new energy electric drive system according to claim 1, characterized in that, Multiple protrusions (4) are installed on the side wall of the brush box (3). The protrusions (4) are inserted into the mounting ring (1) and then riveted to fix the brush box (3) to the side wall of the mounting ring (1).

3. The grounding carbon brush holder for the new energy electric drive system according to claim 1, characterized in that, Multiple brush boxes (3) are evenly arranged on the surface of the mounting ring (1), and the number of brush boxes (3) is 2 to 20.

4. The grounding carbon brush holder for the new energy electric drive system according to claim 1, characterized in that, One end of the carbon brush (5) is arc-shaped.

5. The grounding carbon brush holder for the new energy electric drive system according to claim 4, characterized in that, The mounting ring (1) engages with the bushing (2) internally, and the surface of the bushing (2) abuts against the sidewall of the carbon brush (5).

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