New energy vehicle driving motor shaft self-releasing grounding brush conductive ring

Abstract

The application relates to a ring-shaped structure grounding system module capable of automatically releasing brushes during installation, comprising a conductive ring and a brush self-releasing mechanism, the center of the conductive ring is provided with an opening for the main shaft to pass through, a plurality of brush self-releasing mechanisms are uniformly and circumferentially arranged on the annular end face of the conductive ring, each brush self-releasing mechanism comprises a brush, a brush holder, an elastic member and a mounting seat, sliding grooves are arranged on the two sides of the brush holder, a clamping groove is arranged on the top and one side of the brush holder; the brush is arranged in the brush holder, the head and tail of the brush are respectively limited and supported by torsional springs; before the grounding ring and the main shaft are installed, the brush is limited in the brush holder by the two ends of the torsional spring and cannot move freely; during installation, the motor main shaft passes through the center hole of the grounding ring, and the end of the extended end of the torsional spring is pushed to move in a specific direction, the limitation of the contact end of the brush is removed, the brush is released along the fixed direction of the inner cavity of the brush holder and freely pops out. The ring-shaped grounding module can be installed in limited space, the axial force of the torsional spring during installation of the main shaft is converted into the radial release force of the brush, the release of the brush can be realized at the same time during installation of the motor main shaft, and the extra brush release step is omitted.

Description

TECHNICAL FIELD

[0001] The present application relates to an automatic release mechanism of a conductive ring with a brush, in particular to a grounding brush conductive ring installed in a new energy vehicle drive motor and in sliding contact with the main shaft to lead out the shaft current. BACKGROUND

[0002] With the current new energy vehicle electrical architecture upgrading to 800V or even higher voltage, it means that the shaft current of the drive motor will cause more damage to the motor bearing. First, the motor controller of the new energy vehicle converts direct current into high-frequency alternating current to drive the motor to run, and the capacitive induced voltage caused by current conversion is coupled to the motor shaft, and then high-frequency discharge is performed on the bearing, which ablates the bearing. The high-frequency magnetic flux generated by the common-mode current of the motor controller will also cause high-frequency loop current in the drive motor, which will also damage the bearing. Therefore, a conductive module is needed to lead out the harmful shaft current to protect the bearing from the influence of electric corrosion. The brush grounding system is usually the smallest impedance, the best shaft current leading-out effect, and the longest service life of the grounding solution. At the same time, considering the convenience of installation, it is more economical and efficient to make a ring-shaped grounding module and install it close to the bearing.

[0003] The existing ring-shaped grounding solution generally uses a ring-shaped conductive fiber module, which is composed of a ring-shaped metal middle clamping multiple bundles of conductive fibers. The potential disadvantages of this ring-shaped conductive fiber module are: 1. Short service life: with the long-time operation of the motor, the conductive fiber gradually shortens after wear and tear, which cannot stably contact the motor shaft to protect the motor bearing throughout the life cycle of the motor. 2. High impedance: the contact resistance between the conductive fiber and the shaft is 1Ω, while the contact resistance between the brush and the shaft is 0.01Ω, and the contact resistance of the conductive fiber is two orders of magnitude higher than that of the carbon brush, which is not high in shaft current leading-out efficiency. 3. Additional process and higher cost: usually, the method to reduce the contact resistance between the conductive fiber and the shaft is to apply silver glue at the corresponding contact position of the shaft, and in the oil-cooled motor filled with oil, an additional isolation module is needed to isolate the oil to reduce the impedance, which increases the cost, but the effect of reducing the impedance is not obvious or sustainable.

[0004] The disadvantage of other known circular conductive modules is that the installation is difficult or requires an extra installation process. The condition for good contact between the carbon brush and the main shaft is that the contact force needs to be continuously applied to the carbon brush. At present, the carbon brush is usually pushed by a spring to contact the main shaft. Before the installation of the conductive ring and the main shaft, the carbon brush will protrude into the inside of the conductive ring under the action of the spring force. Direct assembly of the carbon brush conductive ring and the main shaft will interfere and cause abnormal assembly. Therefore, a mechanism is needed to fix the carbon brush in the conductive ring before installation and release the carbon brush after the installation of the main shaft. The existing release requires additional auxiliary installation tools or parts and an additional installation process other than the main shaft installation process to release the carbon brush. It cannot achieve the direct one-time release of the carbon brush after the installation of the main shaft. SUMMARY

[0005] The present application aims at the above problems and discloses a new energy vehicle driving motor shaft self-releasing grounding brush conductive ring, which solves the problem of the release of the brush of the brush conductive ring in the prior art, which requires additional auxiliary installation tools or parts and an additional installation process. It also solves the problem of large contact impedance and low service life of the ring-shaped conductive fiber module. The conductive ring with a ring-shaped structure is matched with the directional opening of the brush holder, the leading end of the torsion spring is turned, the axial force of the pushing spring during the installation of the main shaft is converted into the radial release force of the brush, and the fixation and release of the brush are realized. In the limited ring-shaped space, not only the brush holder installation and support structure of the brush are provided, but also the self-release mechanism of the brush is designed, the quick and simple installation of the conductive ring and the self-release of the brush are realized, the work efficiency is improved, and the cost is reduced.

[0006] The specific technical solutions are as follows:

[0007] The application discloses a new energy vehicle driving motor shaft self-releasing grounding brush conductive ring which is arranged in an electric drive and coaxially arranged with a main shaft or a gear box main shaft; the grounding brush conductive ring comprises a conductive ring and a brush self-releasing mechanism; the center of the conductive ring is provided with an opening for the main shaft to penetrate through; at least one set of brush self-releasing mechanisms are uniformly arranged on the annular end face of the conductive ring in the circumferential direction; each brush self-releasing mechanism comprises a brush, a brush holder, an elastic piece and a mounting seat; the brush holder is fixed on the end face of the conductive ring through fasteners; the front and rear ends of the brush holder are provided with openings; the sliding grooves are formed in the two sides of the brush holder; one end of the sliding groove extends to the rear end opening of the brush holder; the clamping grooves are formed in the top and one side of the brush holder; the brush is arranged in the brush holder; the head and tail of the brush are respectively limited and supported by the elastic piece; the elastic piece is arranged on one side of the brush holder through the mounting seat; the supporting end and the limiting end are respectively arranged at the two ends of the elastic piece; the supporting end of the elastic piece penetrates through the sliding groove on one side of the brush holder and pushes against the tail of the brush in the front direction to support the tail of the brush; the limiting end of the elastic piece penetrates through the clamping groove on the top of the brush holder to limit and support the head of the brush, so that the brush is kept in the brush holder; and one end of the limiting end of the elastic piece is bent and extends to the center opening of the conductive ring in the front direction, so that when the main shaft penetrates through the center opening of the conductive ring and pushes the limiting end of the elastic piece out of the clamping groove, the limiting end of the elastic piece no longer limits the head of the brush, and the tail of the brush is released and freely pops out along the fixed direction of the inner cavity of the brush holder under the support of the supporting end of the elastic piece, so that the head of the brush is pushed against the main shaft.

[0008] Further, the conductive ring is further provided with a protective sleeve matched with the conductive ring; the protective sleeve is in an annular structure and is matched with the size and shape of the conductive ring; a plurality of inner baffles for abutting against the end face of the conductive ring are vertically arranged on the inner side of the protective sleeve; a plurality of positioning blocks are outwardly arranged on the outer side of the protective sleeve; an outer baffle is vertically arranged on the outer periphery of the conductive ring; and a positioning groove for accommodating the positioning blocks is formed in the top of the outer baffle, so as to realize the plug-in positioning of the protective sleeve and the conductive ring.

[0009] Further, the surface of the outer baffle on the outer periphery of the conductive ring is arranged in an arc surface, and the positions of the outer baffles are respectively located between the adjacent two brush self-releasing mechanisms; and the outer periphery arc surface and the bottom surface of the conductive ring are in contact with the shell of the electric drive.

[0010] Further, the brush holder is integrally stamped and formed in a "j" shaped structure, so that the brush holder comprises a shell part and flat plate parts horizontally arranged on the two sides of the shell part; the flat plate parts are fixed on the end face of the conductive ring through fasteners; the sliding grooves and the clamping grooves are respectively arranged on the two sides and the top of the shell part; and the brushes are arranged on the inner side of the shell part.

[0011] Further, a recess is formed on the end face of the conductive ring at each brush self-release mechanism, the recess is arranged in abutment with the two side plate portions of the brush holder, and a convex portion is arranged on the surface of the recess at the inner side of the shell portion, the convex portion cooperates with the inner side of the shell portion to form a square area and limits and guides the brush.

[0012] Further, the limiting end of the elastic member is arranged in Z-shaped bending, and the end of the plate portion of the brush holder near the elastic member is bent upward to form a limiting strip for abutting and limiting the limiting end of the elastic member, so that one end of the limiting end abuts against the limiting strip, the middle part of the limiting end passes through the clamping slot on the brush holder and limits the head of the brush, the clamping slot limits the middle part of the limiting end in the horizontal direction, and the other end of the limiting end is arranged in bending and extends into the central opening of the conductive ring.

[0013] Further, the elastic member is preferably a cylindrical helical torsion spring, and the extending ends of the two ends of the torsion spring form the supporting end and the limiting end respectively.

[0014] Further, the mounting seat is a cylindrical rotary body and is used for sleeving the torsion spring, and the mounting seat is arranged on the plate portion of the brush holder or the end face of the conductive ring.

[0015] Further, the brush comprises a brush body and a brush braid, the brush braid passes through the sliding slot on the other side of the brush holder and is connected and fixed with the brush holder or the conductive ring, the head top end and the tail part of the brush body are respectively provided with recesses for abutting and contacting the limiting end and the supporting end of the elastic member, and the brush body is arranged in the square area formed by the convex portions of the brush holder and the conductive ring.

[0016] Further, the recess of the head of the brush body is a stepped groove structure and is arranged at the head top end of the brush body, and the recess of the tail part of the brush body is a V-shaped groove structure.

[0017] The beneficial effects of the present application are embodied in:

[0018] (1) The present application not only sets the brush holder installation and support structure of the brush in the limited annular space, but also designs the self-release mechanism of the brush, so that the existing conductive fiber ring can be directly replaced without changing the structure design of the motor, the contact impedance can be greatly reduced, the shaft current lead-out efficiency is improved, and the service life of the motor bearing is prolonged. In the wet environment of the high-pressure oil-cooled motor, the self-releasing brush conductive ring has a more significant effect of reducing impedance and prolonging the service life of the motor.

[0019] (2) The present application adopts the annular structure of the conductive ring to cooperate with the directional opening of the brush and the brush holder, uses the first end of the torsion spring to turn, changes the axial force of the spring during the installation of the main shaft into the radial release force of the brush, realizes the automatic release of the brush without additional tooling and parts support, reduces the additional carbon brush release process, and improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structural schematic diagram of the present application.

[0021] Figure 2 is a structural schematic diagram of the present application. Figure 1 is an enlarged schematic diagram of A in the present application.

[0022] Figure 3 is a structural schematic diagram of the brush self-releasing mechanism on the conductive ring in the present application.

[0023] Figure 4 is a structural schematic diagram of the present application before the brush is released (without a protective sleeve).

[0024] Figure 5 is a structural schematic diagram of the present application. Figure 4 is an enlarged schematic diagram of B in the present application.

[0025] Figure 6 is a structural schematic diagram of the present application after the brush is released (without a protective sleeve).

[0026] Figure 7 is a structural schematic diagram of the present application. Figure 6 is an enlarged schematic diagram of C in the present application.

[0027] Figure 8 is a structural schematic diagram of the brush holder in the present application.

[0028] Figure 9 is a structural schematic diagram of the brush in the present application.

[0029] Conductive ring (1), outer baffle (12), positioning groove (121), recess (13), protrusion (14);

[0030] Brush (2), brush braid (21), stepped groove (22), V-shaped groove (23), sliding contact surface (24), brush body (25);

[0031] Brush holder (3), shell part (301), flat plate part (302), clamping groove (31), sliding groove (32), limiting clamping strip (33);

[0032] Elastic member (4), limiting end (41), supporting end (42);

[0033] Mounting seat (5), protective sleeve (6), inner baffle (61), positioning block (62), rivet (7), main shaft (8). DETAILED DESCRIPTION

[0034] In order to make the technical solutions of the present application more clear and explicit, the present application will be further described below in combination with the drawings. Any solution obtained by equivalent replacement and conventional reasoning of the technical features of the technical solutions of the present application falls within the protection scope of the present application. The fixed connection and fixed arrangement mentioned in the present application are general connection modes in the mechanical field, and welding, bolt and nut connection and screw connection are all possible.

[0035] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] As shown in Figures 1-7 The present embodiment provides a new energy vehicle driving motor shaft self-releasing grounding brush conductive ring, which is arranged in the electric drive and coaxially arranged with the main shaft or gear box main shaft, and the bottom surface and the outer cylindrical surface of the grounding brush conductive ring are in contact with the shell of the electric drive. The grounding brush conductive ring comprises a conductive ring 1 and a brush self-releasing mechanism. The center of the conductive ring 1 is provided with an opening for the main shaft 8 to pass through. Three sets of brush self-releasing mechanisms are uniformly distributed on the annular end face of the conductive ring 1 in the circumferential direction. Each brush self-releasing mechanism comprises a brush 2, a brush holder 3, an elastic member 4 and a mounting seat 5. The brush holder 3 is fixed on the end face of the conductive ring 1 by fasteners. The front and rear ends of the brush holder 3 are open. Sliding grooves 32 are formed on both sides of the brush holder 3. One end of each sliding groove 32 extends to the rear end opening of the brush holder 3. A clamping groove 31 is formed on the top and one side of the brush holder 3. The brush 2 is arranged in the brush holder 3. The head and tail of the brush 2 are respectively limited and supported by the elastic members 4.

[0037] The elastic member 4 in the embodiment is preferably a cylindrical helical torsion spring, and other springs of similar form and structure that trigger to release the brush 2 are also within the protection scope of the patent. The extended ends of the torsion spring form a support end 42 and a limiting end 41 respectively, and the torsion spring is arranged on one side of the brush holder 3 through the mounting seat 5. The support end 42 of the torsion spring passes through the sliding groove 32 on one side of the brush holder 3 and presses against the tail of the brush 2, and the limiting end 41 of the torsion spring passes through the clamping groove 31 on the top of the brush holder 3 and presses against the head of the brush 2 to limit the brush 2 before it is released, so that the brush 2 is kept in the brush holder 3. One end of the limiting end 41 of the torsion spring is bent and extends forward into the central opening of the conductive ring 1, so that when the main shaft 8 passes through the central opening of the conductive ring 1 and pushes the limiting end 41 of the torsion spring out of the clamping groove 31, the limiting end 41 of the torsion spring no longer limits the head of the brush 2, and at the same time the tail of the brush 2 is released along the fixed direction of the inner cavity of the brush holder 3 under the support of the support end 42 of the torsion spring and freely pops out, so that the head of the brush 2 is pressed against the main shaft 8.

[0038] In the embodiment, the conductive ring 1 is made of metal or metal composite material, and the implementation is not limited, and in the embodiment, it is pressure cast. The conductive ring 1 is also provided with a protective sleeve 6 matched with the conductive ring 1. The protective sleeve 6 is annular in structure and is adapted in size and shape to the conductive ring 1. A plurality of inner baffles 61 are vertically arranged on the inner side of the protective sleeve 6 for abutting against the end face of the conductive ring 1. A plurality of positioning blocks 62 are outwardly extended on the outer side of the protective sleeve 6. An outer baffle 12 is vertically arranged on the outer side of the conductive ring 1. A positioning groove 121 is formed on the top of the outer baffle 12 for accommodating the positioning blocks 62, so as to realize the insertion and positioning of the protective sleeve 6 and the conductive ring 1. The installation and connection mode of the protective sleeve 6 and the conductive ring 1 is not limited, and the protective sleeve 6 can be cancelled in some applications.

[0039] In the embodiment, the surface of the outer baffle 12 on the outer periphery of the conductive ring 1 is arc-shaped, and the position of the outer baffle 12 is between the self-release mechanisms of the adjacent two brushes. The outer periphery arc surface and part or all of the bottom surface of the conductive ring 1 are in contact with the shell of the electric drive.

[0040] As shown in Figure 8 The brush holder 3 is integrally stamped and formed in a "j" shape structure, so that the brush holder 3 includes a shell part 301 and flat plate parts 302 horizontally arranged on both sides of the shell part 301. The installation and connection mode of the brush holder 3 and the conductive ring 1 is not limited, and in the embodiment, it is connected by rivets 7, which fix the flat plate parts 302 on both sides of the brush holder 3 through rivet interfaces. The sliding groove 32 and the clamping groove 31 are arranged on both sides and the top of the shell part 301 respectively, and the brush 2 is arranged on the inner side of the shell part 301.

[0041] In the embodiment, a recess 13 is formed on the end face of the conductive ring 1 at each brush self-releasing mechanism, and the two sides of the recess are attached to the flat plate part 302 on both sides of the brush holder 3. A protrusion 14 is arranged on the surface of the recess 13 at the inner side of the shell part 301, and the protrusion 14 cooperates with the inner side of the shell part 301 to form a square area and limit and guide the brush 2.

[0042] In the embodiment, the limiting end 41 of the torsion spring is arranged in a Z-shaped bending manner, and the one end of the flat plate part 302 on the side of the brush holder 3 close to the torsion spring is bent upward to form a limiting strip 33 for abutting and limiting the limiting end 41 of the torsion spring. One end of the limiting end 41 abuts against the limiting strip 33, the middle part of the limiting end 41 passes through the clamping groove 31 on the brush holder 3 and limits the head of the brush 2, and the clamping groove 31 limits the middle part of the limiting end 41 in the horizontal direction. The other end of the limiting end 41 is arranged in a bending manner and extends into the central hole of the conductive ring 1.

[0043] In the embodiment, the mounting seat 5 is a cylindrical rotary body and is used for sleeving the torsion spring. The mounting seat 5 is arranged on the flat plate part 302 of the brush holder 3 or the end face of the conductive ring 1. In the embodiment, the mounting seat 5 is arranged in a vertical penetrating manner in the circular hole on one side of the flat plate part 302.

[0044] As shown in Figure 9 , the brush 2 includes a brush body 25 and a brush braid 21. The brush braid 21 passes through the sliding groove 32 on the other side of the brush holder 3 and is connected and fixed with the brush holder 3 or the conductive ring 1. In the embodiment, the brush braid 21 is connected with the flat plate part 302 of the brush holder 3. In some applications, the brush braid 21 can be omitted to reduce the cost. The head top end and the tail part of the brush body 25 are respectively provided with recesses for abutting and contacting the limiting end 41 and the supporting end 42 of the torsion spring. The end face of the head of the brush body 25 is a sliding contact surface 24 for contacting the main shaft 8. In the embodiment, the recess of the head of the brush body 25 is a stepped groove structure and is arranged at the head top end of the brush body 25. The recess of the tail of the brush body 25 is a V-shaped groove 23 structure. The brush body 25 is arranged in the square area formed by the protrusion 14 of the brush holder 3 and the conductive ring 1. The brush holder 3 and the conductive ring 1 are fixed to limit the brush 2 in the square area.

[0045] As shown in Figures 1-2 , the main shaft 8 is inserted into the central hole of the conductive ring 1 and is pushed in the axial direction. When the bent part of the limiting end 41 of the torsion spring is touched, the limiting end 41 of the torsion spring is lifted upward. Under the action of the spring force, the limiting end 41 is retracted in the peripheral direction of the conductive ring 1, and the triggering action of the torsion spring is completed.

[0046] As shown in Figures 6-7 , after the torsion spring is pushed and retracted in the axial direction, the supporting end 42 of the torsion spring pushes the brush 2 to move to the center of the conductive ring 1, and the self-releasing of the brush 2 is completed.

[0047] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A new energy vehicle drive motor shaft self-releasing grounding brush conductive ring, which is arranged in an electric drive and coaxially arranged with a main shaft or a gear box main shaft; characterized in that, The ground brush conducting ring comprises a conducting ring (1) and a brush self-releasing mechanism, the center of the conducting ring (1) is provided with an opening for the main shaft (8) to pass through, at least one set of brush self-releasing mechanisms are uniformly arranged on the annular end face of the conducting ring (1) in the circumferential direction, each brush self-releasing mechanism comprises a brush (2), a brush holder (3), an elastic member (4), and a mounting seat (5), the brush holder (3) is fixed on the end face of the conducting ring (1) by a fastener, sliding grooves (32) are formed on both sides of the brush holder (3), one end of each sliding groove (32) extends to the opening at the rear end of the brush holder (3), and a clamping groove (31) is formed on the top and one side of the brush holder (3); the brush (2) is arranged in the brush holder (3), the front end and the tail end of the brush (2) are respectively limited and supported by the elastic member (4); the elastic member (4) is arranged on one side of the brush holder (3) through the mounting seat (5), the two ends of the elastic member are respectively provided with a supporting end (42) and a limiting end (41), wherein the supporting end (42) of the elastic member passes through the sliding groove (32) on one side of the brush holder (3) and presses against the tail end of the brush (2) in the forward direction, the limiting end (41) of the elastic member passes through the clamping groove (31) on the top of the brush holder (3) and presses against the front end of the brush (2) to limit the front end of the brush (2), so that the brush (2) is kept in the brush holder (3), and one end of the limiting end (41) of the elastic member is bent and extends into the central opening of the conducting ring (1) in the forward direction, so that when the main shaft (8) passes through the central opening of the conducting ring (1) and pushes the limiting end (41) of the elastic member (4) out of the clamping groove (31), the limiting end (41) of the elastic member no longer limits the front end of the brush (2), and at the same time, the tail end of the brush (2) is released and freely pops out along the fixed direction of the inner cavity of the brush holder (3) under the support of the supporting end (42) of the elastic member (4), so as to press the front end of the brush (2) against the main shaft (8).

2. A self-releasing grounding brush conducting ring of a drive motor of a new energy vehicle according to claim 1, characterized in that, The conducting ring (1) is further provided with a protective sleeve (6) matched with the conducting ring, the protective sleeve (6) has an annular structure and is matched with the size and shape of the conducting ring (1), a plurality of inner baffles (61) are vertically arranged on the inner side of the protective sleeve (6) and used for abutting against the end face of the conducting ring (1), a plurality of positioning blocks (62) are outwardly arranged on the outer side of the protective sleeve (6), and an outer baffle (12) is vertically arranged on the outer side of the conducting ring (1), the top of the outer baffle (12) is provided with a positioning groove (121) for accommodating the positioning blocks (62), and the insertion and positioning of the protective sleeve (6) and the conducting ring (1) are realized.

3. A self-releasing ground brush conducting ring of a drive motor of a new energy vehicle according to claim 2, characterized in that, The surface of the outer baffle (12) on the outer periphery of the conducting ring (1) is arranged in an arc shape, the positions of the outer baffles (12) are respectively located between adjacent two brush self-releasing mechanisms, and the outer periphery arc surface and the bottom surface of the conducting ring (1) are in contact with the shell of the electric drive.

4. A self-releasing ground brush conducting ring of a drive motor of a new energy vehicle according to claim 1, characterized in that, The brush holder (3) is integrally stamped and formed into a "C" - shaped structure, such that the brush holder (3) includes a housing portion (301) and flat plate portions (302) horizontally arranged on both sides of the housing portion (301). The flat plate portions (302) are fixed to the end face of the slip ring (1) by fasteners. The sliding grooves (32) and clamping grooves (31) are respectively arranged on both sides and the top of the housing portion (301), and the carbon brush (2) is arranged inside the housing portion (301).

5. A self-releasing ground brush conducting ring of a drive motor of a new energy vehicle according to claim 4, characterized in that, On the end face of the slip ring (1), concave platforms (13) are respectively opened at the positions of each brush self - release mechanism. Both sides of the concave platform are in contact with the flat plate portions (302) on both sides of the brush holder (3). And on the surface of the concave platform (13) at the inner position of the housing portion (301), a convex platform (14) is provided. The convex platform (14) and the inner side of the housing portion (301) cooperate to form a square area for limiting and guiding the carbon brush (2).

6. A self-releasing ground brush conducting ring of a drive motor of a new energy vehicle according to claim 4, characterized in that, The limiting end (41) of the elastic member is bent in a Z - shape. And at one end of the flat plate portion (302) on the side of the brush holder (3) close to the elastic member (4), a limiting clip (33) is bent upward for abutting and limiting the limiting end (41) of the elastic member, such that one end of the limiting end (41) presses against the limiting clip (33). The middle part of the limiting end (41) passes through the clamping groove (31) on the brush holder (3) to limit the head of the carbon brush (2), and the other end of the limiting end (41) is bent and extends into the central opening of the slip ring (1).

7. A self-releasing ground brush conducting ring of a drive motor of a new energy vehicle according to claim 6, characterized in that, The elastic member (4) is a cylindrical helical torsion spring, and the extending ends at both ends of the cylindrical helical torsion spring respectively form the supporting end (42) and the limiting end (41).

8. A self-releasing ground brush conducting ring of a drive motor of a new energy vehicle according to claim 7, characterized in that, The mounting seat (5) is a cylindrical rotating body and is used for sleeving the cylindrical helical torsion spring. The mounting seat (5) is arranged on the flat plate portion (302) of the brush holder (3) or on the end face of the slip ring (1).

9. A self-releasing ground brush conducting ring of a drive motor of a new energy vehicle according to claim 5, characterized in that, The carbon brush (2) includes a brush body (25) and a brush pigtail wire (21). The brush pigtail wire (21) passes through the opening of the sliding groove (32) on the other side of the brush holder (3) and is fixedly connected to the brush holder (3) or the slip ring (1). Grooves are respectively provided at the top and the tail of the head of the brush body (25) for pressing contact with the limiting end (41) and the supporting end (42) of the elastic member. The brush body (25) is installed in the square area formed by the convex platform (14) of the brush holder (3) and the slip ring (1).

10. A self-releasing ground brush conducting ring of a drive motor of a new energy vehicle according to claim 9, characterized in that, The groove at the head of the brush body (25) is in a stepped groove structure and is located at the top of the head of the brush body (25). The groove at the tail of the brush body (25) is in a V - shaped groove (23) structure.

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