A load ring for an injection molded combined conductive ring

Abstract

The utility model provides a kind of load ring of injection molding type combined conductive ring, including combined conductive ring, combined conductive ring includes middle support spring, the both sides of middle support spring are equipped with conductive sheet, the outside of combined conductive ring is equipped with inner ring, the center of inner ring is equipped with inner hole, inner hole is used to be connected on motor shaft, the outside of inner hole is equipped with positioning groove, conductive ring is arranged in positioning groove, the outside of positioning groove is also equipped with outer groove, and communication hole is equipped between outer groove and positioning groove, communication hole is used to connect outer groove and positioning groove, solve the problem that the conductive ring of original design needs to be placed groove on motor shaft, combined conductive ring is not convenient to disassemble.

Description

Technical Field

[0001] This utility model relates to the field of motor grounding, and in particular to a bearing ring for an injection-molded composite conductive ring. Background Technology

[0002] In electric vehicle (EV) drive systems, permanent magnet synchronous motors achieve precise control through variable frequency drives (VFDs) in the motor controller (MCU). The core technology is pulse width modulation (PWM)—using high-frequency switching devices (such as IGBTs) to convert the direct current from the battery into alternating current with adjustable frequency and voltage. While this process meets the vehicle's power requirements, it has inherent technical limitations: PWM modulation generates common-mode voltage due to three-phase voltage asymmetry. This voltage couples through the parasitic capacitance between the stator windings and the rotor, forming a shaft voltage between the motor shaft and the housing.

[0003] When the shaft voltage accumulates to a level exceeding the breakdown threshold of the bearing grease, discharge occurs at the contact points between the rolling elements and the inner and outer rings, triggering an electrical discharge machining (EDM) effect. This results in pits, electro-corrosion spots, and grooves forming on the bearing surface. Such damage deteriorates rapidly under EV operating conditions (high-frequency start-stop, high-speed fluctuations), directly causing abnormal motor noise, increased vibration, and even sudden shutdown, seriously affecting driving safety and significantly increasing maintenance costs.

[0004] To prevent the aforementioned damage paths, EV drive motors using VFD or DC drivers must be equipped with bearing protection devices. Our company's Chinese patent CN120033919A discloses a "combined conductive ring" that solves this problem by establishing a shaft voltage release path. Its core principle is that the shaft voltage generated when the motor shaft rotates is conducted to the motor housing through a conductive sheet for safe release, preventing current from flowing through the bearing and forming a discharge path.

[0005] This solution further optimizes the design by changing the original method of mounting the combined conductive ring on the motor shaft through slots to a load-bearing ring. This makes it easier for the contractor to standardize the specifications of the motor shaft. Its function remains the same: the shaft voltage generated when the motor shaft rotates is transmitted to the motor housing through the conductive sheet, thereby completing the release of the shaft voltage. Utility Model Content

[0006] The main purpose of this utility model is to provide a bearing ring for an injection-molded composite conductive ring, which solves the problem that the original conductive ring design requires a slot to be opened on the motor shaft, and the composite conductive ring is inconvenient to disassemble and assemble.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a bearing ring for an injection-molded combined conductive ring, including a combined conductive ring, the combined conductive ring including a middle support spring, conductive plates provided on both sides of the middle support spring, an inner ring provided on the outer side of the combined conductive ring, an inner hole provided at the center of the inner ring, the inner hole being used to fit onto the motor shaft, a positioning groove provided on the outer side of the inner hole, and the combined conductive ring being arranged in the positioning groove; The outer groove and the positioning groove are used to fill the conductive material. The conductive material is placed between the positioning groove and the conductive sheet, and the conductive sheet abuts against the conductive material.

[0008] In the preferred embodiment, an outer groove is provided on the outside of the positioning groove, and a connecting hole is provided between the outer groove and the positioning groove for connecting the outer groove and the positioning groove.

[0009] In the preferred embodiment, after the positioning groove is filled, a placement groove for placing the combined conductive ring is left.

[0010] In the preferred embodiment, the conductive material is a highly wear-resistant material – PEEK resin. The inner ring is made of 6061 aluminum.

[0011] In the preferred embodiment, the conductive sheet is made of SUS440C material.

[0012] In the preferred embodiment, after the outer groove and the positioning groove are filled, the conductive material forms a whole through the connecting hole to prevent the conductive material from falling off.

[0013] In the preferred embodiment, the combined conductive ring and the inner ring are arranged coaxially.

[0014] This utility model provides a support ring for an injection-molded composite conductive ring, which has the following advantages: 1. This solution changes the original method of mounting the combined conductive ring by slotting it on the motor shaft to mounting it as a load-bearing ring, which makes it easier for the supplier to standardize the specifications of the motor shaft and improves the installation compatibility of the conductive ring.

[0015] 2. The combined conductive ring utilizes the coordinated work of the intermediate support spring, conductive sheet and motor housing to effectively conduct the shaft voltage generated when the motor shaft rotates to the outside of the motor, avoiding the discharge of shaft voltage on the motor bearing. This prevents unexpected motor shutdown caused by electrical discharge machining (EDM) pits, electro-corrosion spots and groove damage, greatly reduces maintenance costs, significantly extends the service life of motor bearings, and ensures stable operation of the motor. Attached Figure Description The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the installation of the bearing ring of this utility model; Figure 2 This is a partially enlarged view of the bearing ring of this utility model; Figure 3 This is an axonometric view of the bearing ring of this utility model; Figure 4 This is a side view of the bearing ring after injection molding of this utility model; Figure 5 This is a schematic diagram of the half-section of the bearing ring after injection molding of this utility model; Figure 6 This is a partial sectional view of the bearing ring of this utility model after injection molding.

[0016] In the figure: 2. Conductive sheet; 3. Motor shaft; 4. Motor housing; 5. Ground wire; 6. Combined conductive ring; 7. Inner ring; 701. Inner hole; 702. Outer groove; 703. Connecting hole; 704. Positioning groove; 8. Conductive material; 9. Wear-resistant coating. Detailed Implementation

[0017] Example 1 Chinese patent CN120033919A proposes a combined conductive ring and its usage method. This solution further optimizes the design based on this, changing the original method of installing the combined conductive ring by slotting it on the motor shaft 3 to installing it as a bearing ring. This makes it easier for the supplier to standardize the specifications of the motor shaft 3. Its function is still that the shaft voltage generated when the motor shaft 3 rotates is transmitted to the motor housing 4 through the conductive sheet 2, and the shaft voltage is released by the ground wire 5.

[0018] like Figure 5 As shown, a carrier ring for an injection-molded composite conductive ring includes a composite conductive ring 6. The composite conductive ring 6 includes a central support spring 1, conductive plates 2 are provided on both sides of the central support spring 1, an inner ring 7 is provided on the outer side of the composite conductive ring 6, an inner hole 701 is provided at the center of the inner ring 7, the inner hole 701 is used to fit onto the motor shaft 3, a positioning groove 704 is provided on the outer side of the inner hole 701, and the composite conductive ring 6 is arranged in the positioning groove 704. like Figure 3 As shown, an outer groove 702 is also provided on the outside of the positioning groove 704, and a connecting hole 703 is provided between the outer groove 702 and the positioning groove 704. The connecting hole 703 is used to connect the outer groove 702 and the positioning groove 704.

[0019] like Figure 2 As shown, in the preferred embodiment, the outer groove 702 and the positioning groove 704 are used to fill the conductive material 8. The conductive material 8 is arranged between the positioning groove 704 and the conductive sheet 2, and the conductive sheet 2 abuts against the conductive material 8.

[0020] like Figure 1 As shown, in the preferred embodiment, after the positioning groove 704 is filled, a placement groove for placing the combined conductive ring 6 is left. The positioning groove 704 is filled by injection molding.

[0021] In the preferred embodiment, the conductive material 8 is a high wear-resistant material - PEEK resin material. In Chinese patent CN120033919A, the conductive sheet 2 is a high wear-resistant material - PEEK resin material as a consumable material. In this embodiment, the conductive sheet 2 is alloy tool steel, and the conductive material 8 is replaced with a high wear-resistant material - PEEK resin material, and the conductive material 8 is used as a consumable material.

[0022] The inner ring 7 is made of 6061 aluminum.

[0023] Example 2 Further explanation in conjunction with Example 1, such as Figure 5 The structure shown in Chinese patent CN120033919A uses a highly wear-resistant material, PEEK resin, as the consumable material for the conductive sheet 2. In the preferred embodiment of this solution, the conductive sheet 2 is made of SUS440C material and is a ring-shaped thin sheet. The processing difficulty of SUS440C material is much lower than that of high wear-resistant material PEEK resin material, thus improving the manufacturing efficiency and continuous production stability of the conductive sheet 2.

[0024] In the preferred embodiment, after the outer groove 702 and the positioning groove 704 are filled, the conductive material 8 forms a whole through the connecting hole 703 to prevent the conductive material 8 from falling off.

[0025] In the preferred embodiment, the conductive sheet 2 abuts against the sidewall of the positioning groove 704 on the inner ring 7.

[0026] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A bearing ring for an injection-molded composite conductive ring, comprising a composite conductive ring (6), wherein the composite conductive ring (6) includes an intermediate support spring (1), and conductive sheets (2) are provided on both sides of the intermediate support spring (1), characterized in that: The outer side of the combined conductive ring (6) is provided with an inner ring (7), and the center of the inner ring (7) is provided with an inner hole (701). The inner hole (701) is used to be sleeved on the motor shaft (3). The outer side of the inner hole (701) is provided with a positioning groove (704). The combined conductive ring (6) is arranged in the positioning groove (704). The outer groove (702) and the positioning groove (704) are used to fill the conductive material (8). The conductive material (8) is arranged between the positioning groove (704) and the conductive sheet (2). The conductive sheet (2) abuts against the conductive material (8).

2. The bearing ring of the injection-molded composite conductive ring according to claim 1, characterized in that: An outer groove (702) is provided on the outside of the positioning groove (704), and a connecting hole (703) is provided between the outer groove (702) and the positioning groove (704). The connecting hole (703) is used to connect the outer groove (702) and the positioning groove (704).

3. The bearing ring of the injection-molded composite conductive ring according to claim 2, characterized in that: After the positioning groove (704) is filled, there is a placement groove for placing the combined conductive ring (6).

4. The bearing ring of the injection-molded composite conductive ring according to claim 2, characterized in that: The conductive material (8) is a high wear-resistant material - PEEK resin material; The inner ring (7) is made of 6061 aluminum.

5. The carrier ring of the injection-molded composite conductive ring according to claim 1, characterized in that: The conductive sheet (2) is made of SUS440C material.

6. The bearing ring of the injection-molded composite conductive ring according to claim 1, characterized in that: external... After the groove (702) and the positioning groove (704) are filled, the conductive material (8) forms a whole through the connecting hole (703) to prevent the conductive material (8) from falling off.

7. The bearing ring of the injection-molded composite conductive ring according to claim 1, characterized in that: The combined conductive ring (6) and the inner ring (7) are arranged coaxially.

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