A quick response non-hysteresis electromagnetic clutch for new energy vehicle transmission

Abstract

The application discloses a quick-response and non-hysteresis electromagnetic clutch for a new energy vehicle transmission, and relates to the technical field of electromagnetic clutches, which comprises a shell and a replacement friction assembly. An output shaft is arranged in the shell. A reset spring sleeve is arranged on the right side of a driven friction plate. An extension sleeve is fixed to the outer side of the driven friction plate. The application realizes the staged contact of the clutch engagement process. When power is supplied, the driven friction ring is in contact with the driving friction ring first, the whole sliding friction energy generated due to the speed difference in the initial engagement stage is transferred to the friction ring, the driving friction plate and the driven friction plate are in stable contact only after the speed difference is basically eliminated, the relative sliding friction between the driving friction plates is fundamentally avoided, the service life of the driving friction plate is greatly prolonged, the core advantage of the electromagnetic clutch, i.e., the fast response speed, is completely retained, and the double effects of zero hysteresis of power transmission and zero sliding friction of the friction plate are realized.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic clutch technology, specifically to a fast-response, lag-free electromagnetic clutch for new energy vehicle transmissions. Background Technology

[0002] With the rapid development of new energy vehicle technology, electromagnetic clutches, as the core component of electric drive transmission systems, are widely used in two-speed transmissions, power coupling devices, and parking brake systems due to their advantages such as fast response speed, high control precision, compact structure, and no need for complex hydraulic auxiliary systems. Existing electromagnetic clutches mainly generate a magnetic field by energizing an electromagnetic coil, which drives the armature to press the driven friction plate against the active friction plate. Power transmission and disconnection are achieved by relying on friction, which can meet the rapid response requirements of electric drive systems for power on / off. However, existing electromagnetic clutches suffer from insurmountable slippage defects during actual operation. When the clutch is engaged, the driving friction plate rotates at high speed with the power source, while the driven friction plate remains stationary or at low speed. There is a significant speed difference between the two, and when they come into direct contact, they generate severe relative sliding friction. This slippage phenomenon accelerates the wear of the friction plates and significantly shortens the service life of the clutch. Under conditions of frequent start-stop and high-speed gear shifting, the slippage problem is even more prominent, and in severe cases, it can even lead to friction plate burning, transmission failure, and other malfunctions. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a fast-response, lag-free electromagnetic clutch for new energy vehicle transmissions, solving the problems mentioned in the background section.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a fast-response, lag-free electromagnetic clutch for a new energy vehicle transmission, comprising a housing and a replacement friction assembly. An output shaft is disposed inside the housing, and an electromagnetic coil is fixed at the inner edge of the housing. From left to right, a telescopic spring sleeve and an active friction plate are sequentially fitted onto the outer wall of the output shaft. A driven friction plate is arranged parallel to the right side of the active friction plate. A return spring sleeve is disposed on the right side of the driven friction plate, and an output turntable is disposed inside the return spring sleeve. The replacement friction assembly includes a micro-telescopic sleeve elastically connected to the outer wall of the telescopic spring sleeve, and an active friction ring is fixed to the side of the micro-telescopic sleeve. An extension sleeve is fixed to the outer side of the driven friction plate, and a driven friction ring is fixed to the side of the extension sleeve.

[0005] Furthermore, the side of the active friction ring is flush with the side of the active friction plate, and the surface of the active friction ring is provided with grooves that are compatible with the surface of the active friction plate.

[0006] Furthermore, the side of the driven friction ring protrudes beyond the side of the driven friction plate, and the surface of the driven friction ring is provided with a toothed groove that matches the surface of the driven friction plate.

[0007] Furthermore, the surface grooves of the driven friction ring are adapted to the surface grooves of the driven friction plate, and the surface grooves of the active friction ring are adapted to the surface grooves of the active friction plate.

[0008] Furthermore, when the electromagnetic coil is energized, it becomes magnetically connected to the extension sleeve through the micro-telescopic sleeve, and the micro-telescopic sleeve is unaffected by the magnetic force.

[0009] Furthermore, the telescopic spring sleeve has a sliding groove inside, and the micro-telescopic sleeve is slidably connected to the telescopic spring sleeve through the sliding groove. Moreover, the portion of the micro-telescopic sleeve located inside the sliding groove is provided with a toothed surface.

[0010] Furthermore, miniature springs are provided on both sides of the groove, and the ends of the miniature springs are elastically connected to sliding plates.

[0011] Furthermore, a magnetic sheet is fixed to the side of the slider away from the micro spring, and a meshing tooth surface is fixed to the side of the slider facing the tooth groove surface.

[0012] Furthermore, a magnetic block is embedded in the middle of the driven friction plate, and an electromagnet is embedded inside the output shaft. When the electromagnet is energized, it repels the magnetic block and the magnetic plate due to their similar polarities.

[0013] This invention provides a fast-response, lag-free electromagnetic clutch for new energy vehicle transmissions, which has the following advantages: 1. This fast-response, lag-free electromagnetic clutch for new energy vehicle transmissions achieves graded contact during clutch engagement by setting an axially retractable active friction ring around the active friction plate and a driven friction ring protruding from its surface around the driven friction plate. When energized, the driven friction ring preferentially engages with the active friction ring, transferring all the slippage energy generated by the speed difference in the initial engagement stage to the friction ring. This ensures that the active and driven friction plates only make stable contact after the speed difference is essentially eliminated, fundamentally avoiding relative sliding friction between the main friction plates and significantly extending their service life. Furthermore, this structure eliminates the speed difference mechanically, eliminating the need for an electronically controlled slow engagement strategy that extends engagement time. It fully retains the core advantage of the electromagnetic clutch's fast response speed, achieving the dual effects of zero power transmission lag and zero friction plate slippage.

[0014] 2. This fast-response, lag-free electromagnetic clutch for new energy vehicle transmissions utilizes an electromagnet-controlled locking mechanism within the telescopic spring sleeve. When the clutch disengages, the repulsive force generated by the energized electromagnet pushes the sliding plate to move, causing the meshing tooth surface to tightly engage with the tooth groove surface of the micro-telescopic sleeve. This instantly locks the micro-telescopic sleeve and the active friction ring fixedly connected to it in the current position, effectively preventing the active friction ring from following the driven friction ring under the rebound of the telescopic spring sleeve. This ensures that the driven friction ring and the active friction ring can be completely separated instantly, completely eliminating the torque transmission lag problem caused by friction ring dragging. At the same time, combined with the auxiliary repulsive force of the electromagnet on the driven friction plate, it can effectively overcome the influence of residual magnetism, ensuring complete clutch disengagement, significantly reducing drag losses, and improving the efficiency and control accuracy of the transmission system. Attached Figure Description

[0015] Figure 1 This is a cross-sectional schematic diagram of the housing of a fast-response, lag-free electromagnetic clutch for a new energy vehicle transmission according to the present invention. Figure 2 This is a schematic diagram of the housing structure of an electromagnetic clutch for a fast-response, lag-free new energy vehicle transmission according to the present invention. Figure 3 This is a schematic diagram of the active friction plate structure of a fast-response, lag-free electromagnetic clutch for a new energy vehicle transmission according to the present invention. Figure 4 This is a schematic diagram of the driven friction plate structure of a fast-response, lag-free electromagnetic clutch for a new energy vehicle transmission according to the present invention. Figure 5 This is a schematic diagram of the structure of the active friction plate and the driven friction plate when the electromagnetic coil of the electromagnetic clutch of a fast-response, lag-free new energy vehicle transmission is de-energized. Figure 6 This is a schematic diagram of the structure of the active friction ring and the driven friction ring meshing and adsorbing when the electromagnetic coil of the electromagnetic clutch of the fast-response, lag-free new energy vehicle transmission is energized. Figure 7 This is a schematic diagram of the structure of the active friction plate and the driven friction plate engaging and adsorbing when the electromagnetic coil of the electromagnetic clutch of the new energy vehicle transmission with fast response and no hysteresis is energized. Figure 8 This is a schematic diagram of the internal structure of the slide groove of an electromagnetic clutch for a fast-response, lag-free new energy vehicle transmission according to the present invention.

[0016] In the diagram: 1. Housing; 2. Output shaft; 3. Electromagnetic coil; 4. Telescopic spring sleeve; 5. Active friction plate; 6. Driven friction plate; 7. Return spring sleeve; 8. Output turntable; 9. Alternate friction assembly; 901. Micro telescopic sleeve; 902. Active friction ring; 903. Extension sleeve; 904. Driven friction ring; 905. Slide groove; 906. Toothed surface; 907. Miniature spring; 908. Slide plate; 909. Magnetic plate; 910. Meshing tooth surface; 911. Magnetic block; 912. Electromagnet. Detailed Implementation

[0017] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0018] like Figures 1-8 As shown, the present invention provides a technical solution: a fast-response, lag-free electromagnetic clutch for a new energy vehicle transmission, comprising a housing 1 and a replacement friction assembly 9. An output shaft 2 is inserted inside the housing 1, and an electromagnetic coil 3 is fixed at the inner edge of the housing 1. A telescopic spring sleeve 4 and an active friction plate 5 are sequentially fitted onto the outer wall of the output shaft 2 from left to right. A driven friction plate 6 is arranged parallel to the right side of the active friction plate 5. A return spring sleeve 7 is arranged on the right side of the driven friction plate 6, and an output turntable 8 is inserted inside the return spring sleeve 7. The replacement friction assembly 9 includes a micro-telescopic sleeve 901 elastically connected to the outer wall of the telescopic spring sleeve 4, and an active friction ring 902 is fixed to the side of the micro-telescopic sleeve 901. The outer side of the driven friction plate 6... An extension sleeve 903 is fixed, and a driven friction ring 904 is fixed to the side of the extension sleeve 903. The side of the active friction ring 902 is flush with the side of the active friction plate 5, and the surface of the active friction ring 902 has a tooth groove that matches the surface of the active friction plate 5. The side of the driven friction ring 904 protrudes from the side of the driven friction plate 6, and the surface of the driven friction ring 904 has a tooth groove that matches the surface of the driven friction plate 6. The tooth groove on the surface of the driven friction ring 904 matches the tooth groove on the surface of the driven friction plate 6. The tooth groove on the surface of the active friction ring 902 matches the tooth groove on the surface of the active friction plate 5. When the electromagnetic coil 3 is energized, it is magnetically connected to the extension sleeve 903 through the micro-telescopic sleeve 901, and the micro-telescopic sleeve 901 is not affected by the magnetic force. The specific operation is as follows: In the initial power-off separation state, i.e. standby state, all electromagnetic components are not powered, the clutch is in a fully disengaged state, and power transmission is interrupted; the return spring sleeve 7 is in a naturally extended state, and pushes the driven friction plate 6 to the right to the maximum separation position through the elastic force, so that the driven friction plate 6 and the driving friction plate 5 form the designed rated air gap, and the side of the driven friction ring 904 protrudes slightly from the side of the driven friction plate 6 at this time; Under the elastic action of the telescopic spring sleeve 4, the micro telescopic sleeve 901 carries the active friction ring 902 to move, so that the side of the active friction ring 902 is flush with the side of the active friction plate 5. After being powered on, the first stage begins. When the electromagnetic coil 3 is powered on, it generates a ring-shaped magnetic field. The magnetic field passes through the air gap and acts on the extension sleeve 903 to generate an axial electromagnetic attraction. The electromagnetic attraction overcomes the elastic force of the return spring sleeve 7 and pushes the driven friction plate 6 closer to the active friction plate 5. Since the driven friction ring 904 protrudes from the driven friction plate 6, the driven friction ring 904 first contacts and meshes with the active friction ring 902. At this time, a small gap is still maintained between the active friction plate 5 and the driven friction plate 6, and no contact occurs. All the sliding energy generated by the speed difference is borne by the small-area and low-cost active friction ring 902 and driven friction ring 904. The friction plates are completely protected. The surfaces of the active friction ring 902 and the driven friction ring 904 are provided with mutually compatible tooth grooves. After contact, the torque is quickly transmitted through tooth meshing to achieve fast response and lag-free power transmission. The materials used for the active friction ring 902 and the driven friction ring 904 are selected based on actual requirements. Ceramic-reinforced copper-based composite materials with a composition of 85% Cu can be used. The 15% ceramic particles give the friction ring significant wear resistance and high-temperature performance. In the later stages, only the relatively low-cost active friction ring 902 and driven friction ring 904 need to be replaced periodically, thereby reducing maintenance costs. In the second stage of energization, as the friction rings contact and begin to transmit torque, the driven friction plate 6 continues to approach the driving friction plate 5 under magnetic attraction. At this time, the driven friction ring 904 maintains its meshing and adsorption state with the driving friction ring 902 and pushes the driving friction ring 902 to translate. Meanwhile, the micro-telescopic sleeve 901 slides along the surface of the telescopic spring sleeve 4 until the driven friction plate 6 meshes and adsorbs with the driving friction plate 5. The influence caused by the speed difference is eliminated by the driven friction ring 904 and the driving friction ring 902, so that the driving friction plate 5 and the driven friction plate 6 can transmit the full rated torque after meshing through the surface grooves, and will not wear excessively due to friction caused by clutch engagement and speed difference. At this time, the driving friction ring 902 and the driven friction ring 904 only play an auxiliary positioning role and no longer bear the slip wear. When a separation command is received, the clutch enters a de-energized state. The electromagnetic coil 3 is de-energized, causing the electromagnetic attraction to disappear. At this time, under the elastic action of the return spring sleeve 7, the driven friction plate 6 carries the driven friction ring 904 back, causing the driven friction plate 6 to quickly separate from the driving friction plate 5, and the driven friction ring 904 to separate from the driving friction ring 902. The clutch returns to the initial de-energized and separated state. Based on the above description, this invention achieves graded contact during clutch engagement by providing an axially extendable active friction ring 902 around the active friction plate 5 and a driven friction ring 904 protruding from the surface of the driven friction plate 6. When energized, the driven friction ring 904 preferentially contacts and engages with the active friction ring 902, transferring all the slippage energy generated by the speed difference in the initial engagement stage to the friction ring. This ensures that the active friction plate 5 and the driven friction plate 6 only make stable contact after the speed difference is basically eliminated, fundamentally avoiding relative sliding friction between the main friction plates and significantly extending the service life of the main friction plates. At the same time, this structure eliminates the speed difference mechanically, eliminating the need for an electronically controlled slow engagement strategy that extends the engagement time. It fully retains the core advantage of the electromagnetic clutch's fast response speed, achieving the dual effects of zero power transmission lag and zero friction plate slippage.

[0019] like Figures 1-8 As shown, the telescopic spring sleeve 4 has a sliding groove 905 inside, and the micro telescopic sleeve 901 is slidably connected to the telescopic spring sleeve 4 through the sliding groove 905. The part of the micro telescopic sleeve 901 located inside the sliding groove 905 is provided with a toothed surface 906. Micro springs 907 are provided on both sides of the sliding groove 905, and the ends of the micro springs 907 are elastically connected to the sliding pieces 908. A magnetic piece 909 is fixed on the side of the sliding piece 908 away from the micro springs 907, and a meshing tooth surface 910 is fixed on the side of the sliding piece 908 facing the toothed surface 906. A magnetic block 911 is embedded in the middle of the driven friction piece 6. An electromagnet 912 is embedded inside the output shaft 2. When the electromagnet 912 is energized, it repels the magnetic block 911 and the magnetic piece 909. The specific operation is as follows: when the power is cut off upon receiving the separation command, the driven friction piece 6 quickly separates from the active friction piece 5. At the same time, the electromagnet 912 is energized and repels the magnetic block 911 to enhance the separation effect between the driven friction piece 6 and the active friction piece 5, so as to avoid the driven friction piece 6 and the active friction piece 5 from being incompletely separated due to residual magnetic force. When the electromagnet 912 is energized, it also repels the magnetic plate 909 due to their similar polarity. Under the influence of the repulsive force, the magnetic plate 909 carries the meshing tooth surface 910 to mesh with the tooth groove surface 906 of the micro-telescopic sleeve 901. At this time, the micro spring 907 enters the contracted state, thereby locking the micro-telescopic sleeve 901 when the driven friction plate 6 separates from the active friction plate 5. This prevents the active friction ring 902 from prolonging the meshing state between the active friction ring 902 and the driven friction ring 904 due to the rebound effect of the telescopic spring sleeve 4, so as to ensure that the driven friction ring 904 can separate from the active friction ring 902 at the same time as the driven friction plate 6, so as to ensure that the interruption of torque transmission is not delayed. The electromagnet 912 is energized momentarily, that is, it is energized for a preset time and then automatically de-energized. After the electromagnet 912 is de-energized, the clutch has already entered the initial de-energized separation state. At this time, the miniature spring 907 rebounds and resets, causing the meshing tooth surface 910 to separate from the tooth groove surface 906, thereby unlocking the sliding of the micro telescopic sleeve 901, thus entering the preparation state for the next energization process. Based on the above description, the present invention provides a locking mechanism controlled by an electromagnet 912 inside the telescopic spring sleeve 4. When the clutch is disengaged, the repulsive force generated by the energized electromagnet 912 pushes the slide plate 908 to move, so that the meshing tooth surface 910 and the tooth groove surface 906 of the micro-telescopic sleeve 901 are tightly engaged, instantly locking the micro-telescopic sleeve 901 and the active friction ring 902 fixedly connected to it in the current position. This effectively prevents the active friction ring 902 from following the driven friction ring 904 under the rebound action of the telescopic spring sleeve 4, ensuring that the driven friction ring 904 and the active friction ring 902 can be completely separated instantly, completely eliminating the torque transmission lag problem caused by friction ring drag. At the same time, combined with the auxiliary repulsive force of the electromagnet 912 on the driven friction plate 6, the residual magnetism effect can be effectively overcome, ensuring complete clutch disengagement, significantly reducing drag loss, and improving the efficiency and control accuracy of the transmission system.

[0020] In summary, the working process of this fast-response, lag-free electromagnetic clutch for new energy vehicle transmissions is described in detail in stages: I. Initial power-off disconnection state (standby state) All electromagnetic components are de-energized, the clutch is fully disengaged, and power transmission is completely interrupted. When the return spring sleeve 7 is in its naturally extended state, the spring generates axial elastic force to push the driven friction plate 6 to move to the maximum separation limit, so that the driven friction plate 6 and the driving friction plate 5 form the designed rated air gap; The pre-compression spring inside the telescopic spring sleeve 4 is in a naturally extended state, pushing the micro-telescopic sleeve 901 to slide along the slide groove 905 to the initial limit, so that the active friction ring 902 and the active friction plate 5 remain flush. The driven friction ring 904 is rigidly fixed to the outer circumference of the driven friction plate 6 by the extension sleeve 903. Its side protrudes from the side of the driven friction plate 6 by a certain distance. This protrusion ensures the realization of the graded contact sequence. The miniature springs 907 on both sides of the slide groove 905 are in a natural state, so that the meshing tooth surface 910 at the end of the slide plate 908 is completely disengaged from the tooth groove surface 906 on the inner wall of the micro-telescopic sleeve 901, and the micro-telescopic sleeve 901 is in a free axial sliding state. The electromagnet 912 inside the output shaft 2 is not energized, and the magnetic block 911 in the center of the driven friction plate 6 and the magnetic plate 909 on the slider 908 are not subject to magnetic force. Power input path: Output shaft 2 → telescopic spring sleeve 4 → active friction plate 5 → active friction ring 902 rotates with it; driven friction plate 6, output turntable 8, and driven friction ring 904 remain stationary, with no drag torque; II. First stage after energization: Friction rings engage preferentially, quickly eliminating speed difference. When the vehicle controller issues an engagement command, electromagnetic coil 3 is first energized with its rated current, while electromagnet 912 remains de-energized. When the electromagnetic coil 3 is energized, it generates a closed loop magnetic field. Since the micro-telescopic sleeve 901 is made of non-magnetic material, the magnetic field completely bypasses the component and does not generate magnetic flux shunting. The magnetic field acts on the extension sleeve 903 to generate an axial electromagnetic attraction force, which overcomes the elastic force of the return spring sleeve 7 and pushes the driven friction plate 6 to move axially as a whole. Since the driven friction ring 904 protrudes from the driven friction plate 6, the driven friction ring 904 first contacts and engages with the driving friction ring 902. At this time, a safe gap is still maintained between the main friction plates, and no contact occurs. The surfaces of the active friction ring 902 and the driven friction ring 904 are provided with mutually compatible involute tooth grooves. After contact, part of the rated torque is transmitted instantaneously through tooth surface meshing, reducing the speed difference between the active and driven sides to an extremely low level in a very short time. During this stage, all the sliding energy and impact load are borne by the friction ring made of ceramic-reinforced copper-based composite material, and the main friction plate is completely protected. The friction ring material has excellent wear resistance and high temperature performance, and can withstand the instantaneous high temperature generated by sliding without thermal decay. III. Second stage of energization: The main friction plates smoothly engage, transmitting the full rated torque. After the friction rings are engaged, the electromagnetic attraction continues to act, entering the main torque transmission stage: The electromagnetic attraction force continuously generated by the electromagnetic coil 3 pushes the driven friction plate 6 to continue moving. The driven friction ring 904 drives the active friction ring 902 to move synchronously through tooth surface meshing, compressing the micro telescopic sleeve 901 to slide along the slide groove 905, and at the same time compressing the pre-compression spring of the telescopic spring sleeve 4. When the micro-telescopic sleeve 901 slides to the corresponding position, the driven friction plate 6 and the active friction plate 5 are fully engaged. At this time, the speed difference between the active and driven sides has been basically eliminated, and the main friction plate achieves a smooth engagement without slippage or impact. The positive pressure generated by electromagnetic attraction causes the main friction plates to mesh tightly through the surface grooves, transmitting the full rated torque; at this time, the active friction ring 902 and the driven friction ring 904 only serve as auxiliary positioning and overload protection, and no longer bear the sliding load. Stable power transmission path: Output shaft 2 → Active friction plate 5 → Driven friction plate 6 → Output turntable 8 → Load; IV. Power-off separation stage: Dual magnetic repulsion forces work together to achieve rapid, drag-free separation. When the separation command is received, electromagnetic coil 3 is de-energized, and electromagnet 912 is momentarily energized with a pulse current: After the electromagnetic coil 3 is de-energized, the main electromagnetic attraction force rapidly decreases; at the same time, the electromagnet 912 inside the output shaft 2 is energized to generate a magnetic field, and its magnetic poles are the same as those of the magnetic block 911 and the magnetic sheet 909, generating a double repulsive force. The first repulsive force is the main separation force: the repulsive force of the electromagnet 912 on the central magnetic block 911 of the driven friction plate 6, combined with the elastic force of the return spring sleeve 7, jointly pushes the driven friction plate 6 to quickly return to its original position. The separation time is significantly shortened compared with the traditional electromagnetic clutch, which can effectively overcome the residual magnetism of soft magnetic materials. The second repulsive force is the locking force: the repulsive force of the electromagnet 912 on the magnetic piece 909 on the slider 908 overcomes the miniature spring 907 and compresses it, pushing the slider 908 to make the meshing tooth surface 910 tightly mesh with the tooth groove surface 906 of the micro-telescopic sleeve 901, and instantly locking the micro-telescopic sleeve 901 in the current position. After the micro-telescopic sleeve 901 is locked, the active friction ring 902 is fixed in the corresponding position and cannot move with the driven friction ring 904, ensuring that the driven friction ring 904 and the active friction ring 902 are completely separated instantly, thus completely avoiding torque transmission lag caused by friction ring dragging. After the electromagnet 912 reaches the preset energization time, it automatically de-energizes, the miniature spring 907 returns to the slide 908 to reset, the meshing tooth surface 910 disengages from the tooth groove surface 906, the micro-telescopic sleeve 901 unlocks, and the telescopic spring sleeve 4 pushes the micro-telescopic sleeve 901 back to the initial position, preparing for the next engagement. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A fast-response, lag-free electromagnetic clutch for a new energy vehicle transmission, comprising a housing (1) and a replacement friction assembly (9), characterized in that: An output shaft (2) is inserted inside the housing (1), and an electromagnetic coil (3) is fixed at the inner edge of the housing (1). A telescopic spring sleeve (4) and an active friction plate (5) are sequentially fitted on the outer wall of the output shaft (2) from left to right. A driven friction plate (6) is arranged parallel to the right side of the active friction plate (5). A return spring sleeve (7) is arranged on the right side of the driven friction plate (6), and an output turntable (8) is inserted inside the return spring sleeve (7). The alternative friction assembly (9) includes a micro telescopic sleeve (901) elastically connected to the outer wall of the telescopic spring sleeve (4), and an active friction ring (902) is fixed on the side of the micro telescopic sleeve (901). An extension sleeve (903) is fixed on the outer side of the driven friction plate (6), and a driven friction ring (904) is fixed on the side of the extension sleeve (903). The telescopic spring sleeve (4) 4) has a sliding groove (905) inside, and the micro-telescopic sleeve (901) is slidably connected to the telescopic spring sleeve (4) through the sliding groove (905). The part of the micro-telescopic sleeve (901) inside the sliding groove (905) is provided with a toothed surface (906). Micro springs (907) are provided on both sides of the sliding groove (905), and the ends of the micro springs (907) are elastically connected to a sliding piece (908). A magnetic piece (909) is fixed on the side of the sliding piece (908) away from the micro springs (907), and a meshing tooth surface (910) is fixed on the side of the sliding piece (908) facing the toothed surface (906). A magnetic block (911) is embedded in the middle of the driven friction piece (6). An electromagnet (912) is embedded inside the output shaft (2), and the electromagnet (912) is energized and repulses the magnetic block (911) and the magnetic piece (909) of the same polarity.

2. The fast-response, lag-free electromagnetic clutch for a new energy vehicle transmission according to claim 1, characterized in that: The side of the active friction ring (902) is flush with the side of the active friction plate (5), and the surface of the active friction ring (902) is provided with a tooth groove that matches the surface of the active friction plate (5).

3. The fast-response, lag-free electromagnetic clutch for a new energy vehicle transmission according to claim 1, characterized in that: The side of the driven friction ring (904) protrudes from the side of the driven friction plate (6), and the surface of the driven friction ring (904) is provided with a tooth groove that matches the surface of the active friction plate (5).

4. The fast-response, lag-free electromagnetic clutch for a new energy vehicle transmission according to claim 1, characterized in that: The surface grooves of the driven friction ring (904) are adapted to the surface grooves of the driven friction plate (6), and the surface grooves of the active friction ring (902) are adapted to the surface grooves of the active friction ring (902).

5. The fast-response, lag-free electromagnetic clutch for a new energy vehicle transmission according to claim 1, characterized in that: When the electromagnetic coil (3) is energized, it is magnetically connected to the extension sleeve (903) through the micro-telescopic sleeve (901), and the micro-telescopic sleeve (901) is not affected by the magnetic force.

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