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CN-224204551-U - Press-fit type conducting ring and motor

CN224204551UCN 224204551 UCN224204551 UCN 224204551UCN-224204551-U

Abstract

The utility model provides a press-fit type conducting ring and a motor, which belong to the technical field of conducting rings, and comprise an annular part, wherein the annular part is provided with at least one press-fit hole, one part of a conducting fiber bundle is arranged in a metal pipe in a penetrating way, the metal pipe is tightly hooped with the conducting fiber bundle, the inner pipe wall of the metal pipe is attached to the conducting fiber bundle, the metal pipe is inserted into the press-fit hole, the metal pipe is in interference fit with the press-fit hole, the conducting fiber bundle can be implanted into the metal pipe and form a conducting brush in a pre-riveting way, then the conducting brush can be press-fitted into the press-fit hole, and in the press-fitting process, the metal pipe is contracted and deformed by the radial extrusion force of the press-fit hole, so that the metal pipe is in interference fit with the press-fit hole, the metal pipe and the annular part are ensured to be fixed together, the deformed metal pipe is tightly hooped with the conducting fiber bundle, the conducting fiber bundle is combined together in a surface contact way, the conducting performance and the riveting strength are ensured, and the conducting fiber bundle cannot be broken.

Inventors

  • SHEN YINGJIE
  • YU ZHENHUAN
  • QIN YULIN
  • LIU YIWEN

Assignees

  • 浙江黎明智造股份有限公司

Dates

Publication Date
20260505
Application Date
20250429

Claims (20)

  1. 1. A press-fit conductive ring, comprising: The annular piece (100), the annular piece (100) is provided with at least one press-fit hole (110), the press-fit hole (110) is arranged along the radial direction of the annular piece (100), two ports of the press-fit hole (110) are respectively an inner port (111) and an outer port (112), the inner port (111) is positioned on the inner peripheral surface of the annular piece (100), and the outer port (112) is positioned on the outer peripheral surface of the annular piece (100); Conductive brush (200), the quantity of conductive brush (200) with the quantity of pressure equipment hole (110) is unanimous and one-to-one sets up, conductive brush (200) include tubular metal resonator (210) and electrically conductive fiber bundle (220), in partly wearing to locate tubular metal resonator (210) of electrically conductive fiber bundle (220), tubular metal resonator (210) banding electrically conductive fiber bundle (220), the interior pipe wall of tubular metal resonator (210) with electrically conductive fiber bundle (220) laminating, tubular metal resonator (210) are inserted in pressure equipment hole (110), tubular metal resonator (210) with pressure equipment hole (110) interference fit.
  2. 2. A press-fit conductive ring as set forth in claim 1, wherein an end portion of said metal tube (210) is provided with an outer chamfer portion (212), and an outer diameter of an end portion position of said outer chamfer portion (212) is smaller than an aperture of said outer port (112).
  3. 3. A press-fit conductive ring as set forth in claim 1, wherein said outer port (112) is provided with an inner chamfer portion (113) for guiding said conductive brush (200) to be pressed into said press-fit hole (110), said inner chamfer portion (113) having a larger pore diameter than an original outer diameter of said metal pipe (210).
  4. 4. A press-fit conductive ring as set forth in claim 1, 2 or 3, wherein said press-fit holes (110) are formed in a tapered hole body structure having gradually decreasing diameters in a direction from said outer port (112) to said inner port (111).
  5. 5. A press-fit conductive ring as set forth in claim 4, wherein the interference between said metal tube (210) and said press-fit hole (110) increases gradually in the direction from said outer port (112) to said inner port (111).
  6. 6. A press-fit conductive ring as set forth in claim 4, wherein said press-fit holes (110) are provided in a conical hole structure having a linearly changing pore diameter or said press-fit holes (110) are provided in a trumpet hole structure having a non-linearly changing pore diameter.
  7. 7. A press-fit conductive ring as set forth in claim 1, 2 or 3, wherein said press-fit hole (110) has a critical position therein, a tapered hole section (114) is formed between said outer port (112) and said critical position, a pinching hole section (115) is formed between said critical position and said inner port (111), and the aperture of said tapered hole section (114) is tapered from said outer port (112) to said critical position.
  8. 8. A press-fit conductive ring as set forth in claim 7 wherein said gripping aperture section (115) is configured as a cylindrical bore of constant bore diameter.
  9. 9. A press-fit conductive ring as set forth in claim 7 wherein said tapered bore section (114) is configured as a conical bore having a linearly varying bore diameter or said tapered bore section (114) is configured as a trumpet bore having a non-linearly varying bore diameter.
  10. 10. A press-fit conductive ring as set forth in claim 1, wherein said metal tube (210) is provided with at least one pre-pressing portion (211) for preliminarily fixing said conductive fiber bundle (220), said metal tube (210) being capable of preliminarily pressing said conductive fiber bundle (220) through said pre-pressing portion (211) in an original state to thereby form a preform of said metal tube (210) and said conductive fiber bundle (220).
  11. 11. A press-fit conductive ring as set forth in claim 10, wherein said pre-pressing portion (211) is provided in a structure protruding from a wall of said metal pipe (210) into the pipe.
  12. 12. A press-fit conductive ring as set forth in claim 11, wherein said pre-pressing portion (211) is provided in an elongated convex structure, and a length direction of said pre-pressing portion (211) is provided in an axial direction of said metal pipe (210) or a length direction of said pre-pressing portion (211) is provided in a circumferential direction of said metal pipe (210).
  13. 13. A press-fit conductive ring as set forth in claim 10 or 12, wherein the number of said pre-pressing portions (211) is plural, and the pressing surfaces of the plurality of pre-pressing portions (211) and said conductive fiber bundles (220) are wavy.
  14. 14. A press-fit conductive ring as set forth in claim 1, wherein said press-fit holes (110) are plural in number, and each of said press-fit holes (110) is arranged in a circumferential direction of said ring member (100).
  15. 15. A press-fit conductive ring as set forth in claim 1, wherein said ring member (100) is provided as an aluminum alloy member or a copper alloy member or a stainless steel member.
  16. 16. A press-fit conductive ring as set forth in claim 1 or 10, wherein said conductive fiber bundles (220) are comprised of a plurality of conductive filaments.
  17. 17. A press-fit conductive ring as set forth in claim 1, wherein at least one annular surface of said ring member (100) is provided with an annular cooling groove (120).
  18. 18. A press-fit conductive ring as set forth in claim 1, wherein one end of said conductive fiber bundle (220) extends out of said inner port (111) or one end of said conductive fiber bundle (220) extends out of said outer port (112).
  19. 19. An electric motor comprising a press-fit conductive ring as claimed in any one of claims 1 to 18, and further comprising a housing (300) and a spindle (400), one of the ring (100) and the conductive fiber bundle (220) being connected to the housing (300) and the other being connected to the spindle (400).
  20. 20. An electric motor according to claim 19, wherein the outer peripheral surface of the ring member (100) is fixedly connected to the housing (300), and one end of the conductive fiber bundle (220) extends from the inner end (111) of the ring member (100) and contacts the main shaft (400).

Description

Press-fit type conducting ring and motor Technical Field The utility model belongs to the technical field of conducting rings, and relates to a press-fit conducting ring and a motor. Background In the motor system powered by the variable frequency power supply, high-order harmonic components exist in the power supply voltage due to the rapid switching of the power conversion device in the variable frequency power supply, electromagnetic induction is generated between the stator winding coil and the rotor coil under the action of a voltage pulse waveform, the voltage of the rotating shaft is changed through distribution parameters, so that shaft voltage is generated, and when an oil film between a motor shaft and a bearing breaks down, a loop is formed between the motor shaft and the bearing, and then shaft current is generated. In addition, the motor has asymmetric three-phase current, unbalanced magnetic circuit reluctance, static accumulated charge and the like, and axial current can be generated. Because the shaft current of the motor system is the current with transient change, the intensity of electromagnetic waves radiated outwards is higher in the current change process, and the electromagnetic compatibility of the system is seriously affected. And when the shaft current is too large, the bearing can be corroded electrically, and the service life of the motor is influenced. Taking a new energy automobile motor as an example, with current passing through the bearing, the electric corrosion phenomenon can occur on the surfaces of the seat ring and the ball, so that the dynamic performance of the automobile is gradually reduced. When the vehicle eventually fails to travel due to insufficient power, this means that the motor bearings have been severely damaged. Is embodied in that the grease color is darkened to black and pits are visible on the bearing race and ball surfaces. The particulate matter generated by the electro-erosion is sealed inside the bearing, further accelerating the wear process of the bearing and greatly shortening the service life. In order to solve the problem caused by shaft current, in the prior art, a conducting ring is usually arranged on a motor shaft, the main body of the conducting ring is a metal ring, the conducting ring is sleeved on the periphery of the motor shaft, a conducting brush is fixed on the inner side of the conducting ring, and the conducting brush comprises conducting fiber bundles. When the motor shaft rotates, the conductive fiber bundles are kept in contact with the motor shaft, and the conductive fiber bundles are grounded through the conductive brush, so that the current of the motor shaft is discharged. In the production flow of the conductive ring, the installation of the conductive fiber bundles is a key difficulty in the manufacturing process. At present, the traditional riveting process is generally adopted in the industry to connect the ring body and the conductive fiber bundles, but the traditional riveting method has the defects that the riveting part only forms dotted line contact, so that the conductive performance between the ring body and the conductive fiber bundles is unstable, the riveting strength is insufficient, and the problem of broken wires of the conductive fiber bundles is easily caused. Disclosure of utility model The utility model aims to solve the problems in the prior art and provides a press-fit conductive ring and a motor. The utility model can be realized by the following technical scheme that the press-fit conductive ring comprises: the annular piece is provided with at least one press-fit hole, the press-fit hole is arranged along the radial direction of the annular piece, two ends of the press-fit hole are respectively an inner port and an outer port, the inner port is positioned on the inner peripheral surface of the annular piece, and the outer port is positioned on the outer peripheral surface of the annular piece; The quantity of the electric conduction brushes is consistent with that of the press-fit holes and corresponds to that of the press-fit holes one by one, the electric conduction brushes comprise metal tubes and conductive fiber bundles, a part of the conductive fiber bundles are arranged in the metal tubes in a penetrating mode, the metal tubes are hooped by the conductive fiber bundles, the inner tube walls of the metal tubes are attached to the conductive fiber bundles, the metal tubes are inserted into the press-fit holes, and the metal tubes are in interference fit with the press-fit holes. Preferably, an outer chamfer portion is arranged at one end of the metal pipe, and the outer diameter of the end portion of the outer chamfer portion is smaller than the aperture of the outer port. Preferably, the outer port is provided with an inner chamfer portion for guiding the conductive brush to be pressed into the press-fit hole, and the aperture of the inner chamfer portion is larger than the original outer di