Omnidirectional elastomer high-conductivity segmentation ring

Abstract

Provided is an omnidirectional elastomer high-conductivity segmentation ring, comprising an outer framework (1), a gasket (2) and a flow guide assembly. The flow guide assembly comprises a conductive ring (4), a plurality of lips (3), liquid-cured conductive silica gel (12), and an elastomer integrally bonded with the conductive silica gel (12). The omnidirectional elastomer high-conductivity segmentation ring solves the problem that shaft current generated by a motor at high speed corrodes parts, affecting the stability of the working state of bearings and other accessories sleeved on a main shaft, and then affecting the working stability, reliability and safety of the motor at high speed, high power and high torque, and overcomes the leading technical problem of limited motor power, which is a shaft current problem that must be solved in a short time, otherwise there will be potential safety hazards. The plurality of sector lips (3) are provided, and can synchronously move on the basis of the radial or axial movement of a shaft (16) while ensuring good electrical contact and enough contact area with the shaft (16), the following performance is excellent, and it is also ensured that the instantaneous electrical contact performance of the conductive silica gel (12) and the shaft (16) is good.

Description

An all-round elastic high-conductivity split ring Technical Field

[0001] The present invention relates to the technical field of motor accessories, and in particular to an omnidirectional elastic high-conductivity split ring. Background Art

[0002] At present, the new energy vehicle market is booming, and the development of the "three electrics" of new energy vehicles is progressing rapidly. Many new energy vehicle companies are gradually increasing their R&D investment in motors, batteries and electronic controls. Among them, the most important motor technology has become the current theme of overcoming difficulties.

[0003] At present, the technical barriers to motors in new energy vehicles lie in the motor power, torque and speed limits. The highest power currently available is difficult to exceed 400KW, and the maximum torque is also difficult to exceed 800Nm. The technical difficulties that need to be overcome are: the stability, reliability and safety of the motor spindle at high speeds.

[0004] The existing problem we have identified is that at high speeds, the motor shaft generates shaft currents due to static and dynamic friction between the various stator and rotor components within the motor. This shaft current is particularly pronounced in high-voltage 800V new energy vehicle powertrains. This shaft current can corrode surrounding components, directly impacting the stability of the shaft bearings, and thus the motor's operating stability under high speeds, high power, and high torque. Higher power levels increase the shaft currents, and the resulting damage is more severe. Therefore, most motor manufacturers set a power cap. While increasing input power to increase motor speed is practical, the shaft currents generated accelerate wear and corrosion of the motor's internal dynamic components, effectively halving the motor's service life.

[0005] To this end, many car companies have discussed, designed and demonstrated various solutions to solve the shaft current problem. The current solution is to use a metal brush at the bearing position to guide the current generated by the shaft at high speed and release the current. However, the actual effect of the metal brush's current diversion will be restricted by the water cooling or oil cooling solution used by the motor. The metal brush needs to be isolated from water or oil to work; and the metal brush itself will also cause wear on the shaft. The greater the pressure on the contact, the more it affects the shaft speed; and it will also cause the shaft to heat up quickly, causing the heat inside the entire motor powertrain to rise, affecting the heat exchange of the powertrain and causing unstable operating conditions.

[0006] Therefore, the electric motor technology used in new energy vehicles, or various technical fields that need to be applied to electric motors, need to solve the problem of how to release the shaft current as soon as possible, and it must not cause wear and corrosion to the rotating shaft, nor affect the water cooling or oil cooling solution of the internal stator and rotor.

[0007] Summary of the Invention

[0008] The purpose of the present invention is to solve the problem that the shaft current generated by the motor at high speed will corrode the peripheral parts of the shaft, affect the stability of the working state of accessories such as bearings sleeved on the main shaft, and further affect the working stability, reliability and safety of the motor under high speed, high power and large torque. It is necessary to design an auto part that can quickly guide and release the shaft current without affecting the water or oil flow circulation in the water cooling or oil cooling system; while contacting with the shaft to release the current, a small radial force is applied to the outer periphery of the shaft, and the sliding friction is greatly reduced, which does not affect the shaft speed, thereby effectively reducing the energy consumption of the motor, and ensuring the working stability and safety of the motor, so that the motor power can be increased with confidence, thereby enabling the new energy vehicle motor to release higher speed, power and torque.

[0009] The technical solutions adopted to solve the above problems are:

[0010] An omnidirectional elastomer highly conductive split ring comprises an exoskeleton made of a metal material, a gasket made of a metal material, and a flow guide assembly tightly compressed by the exoskeleton and the gasket. The flow guide assembly comprises a conductive ring, a plurality of lips arranged in a fan-shaped annular array on the outer periphery of the shaft, conductive silicone that is in direct contact with the outer periphery of the shaft after liquid solidification, and an elastomer with conductive ability that is bonded to the conductive silicone and can move radially along the shaft.

[0011] The conductive silicone is filled in the lip, and the lip stabilizes the conductive silicone structure. The elastomer can conduct the current guided by the conductive silicone from the shaft to the conductive ring, and the conductive ring releases the current outward through the gasket and / or the outer frame.

[0012] The outer frame, gasket and conductive ring are all annular and are sleeved on the high-speed shaft with clearance fit. The outer peripheral surface of the lip is provided with a conductive hole that matches the elastomer. The conductive hole is sleeved with the elastomer. One end of the inner side of the elastomer is directly bonded to the conductive silicone before curing filled in the lip flow groove. After the conductive silicone liquid is cured, it is integrally formed.

[0013] One end of the outer side of the elastic body is sleeved with the adjustment hole provided in the conductive ring.

[0014] An adjustable positioning pin is provided between the elastomer and the conductive ring. The positioning pin is arranged in the adjustment hole. The positioning pin adjusts the pressing force of the elastomer on the conductive silicone along the radial direction of the shaft, can adapt to the shaft diameter of different rotating shafts, and adjust the contact pressing force.

[0015] Furthermore, the outer ring of the exoskeleton is tightly fitted with the metal shell, and the inner ring of the exoskeleton is tightly fitted with the gasket through interference fit, both of which constitute electrical conduction and guide the current to be released outward.

[0016] Furthermore, the lip and the inner ring of the conductive silicone are both provided with an arc-shaped surface that touches the outer ring of the shaft. The arc-shaped surface contacts the shaft and maintains a small clamping force to maintain electrical conduction.

[0017] Furthermore, the lip is made of rubber or silicone material.

[0018] Furthermore, the elastomer adopts a metal spring, and the lip and conductive silicone can be radially pressed against the outer periphery of the shaft under the elastic force of the spring to maintain electrical conduction. It can jump with the radial jump of the shaft and can move slightly with the axial slight movement. Even if the outer periphery of the shaft has a taper, it can still maintain all-round stable contact and conduct the shaft current.

[0019] Furthermore, the elastomer adopts a metal guide rod to increase the outward discharge efficiency of the conductive silicone. The metal guide rod is sleeved with the through hole in the center of the positioning pin. A spring is also sleeved between the metal guide rod and the positioning pin to ensure that the metal guide rod can slide radially.

[0020] The beneficial effects of the present invention are:

[0021] 1. This omnidirectional, highly conductive elastomer split ring solves the problem of shaft current generated by high-speed motors in new energy vehicles corroding surrounding shaft parts, affecting the stability of the working state of accessories such as bearings mounted on the main shaft, and thus affecting the operating stability, reliability, and safety of the motor under high speed, high power, and high torque. This solves the cutting-edge technical challenge of limited motor power, a shaft current issue that must be resolved quickly to prevent safety hazards.

[0022] 2. The several fan-shaped lips used in this design ensure good electrical contact with the shaft and sufficient contact area. At the same time, they can also move synchronously according to the radial or axial movement of the shaft, with excellent following performance, and also ensure good instantaneous electrical contact performance between the conductive silicone and the shaft.

[0023] 3. A positioning pin is set inside the conductive ring to match the elastic body threaded connection. The strength of the conductive silicone gripping the shaft can be freely adjusted, reducing the sliding friction between the lip and the conductive silicone on the outer periphery of the shaft, reducing heat generation, reducing motor damping, saving electricity, and extending vehicle range when used in electric vehicles.

[0024] 4. The use of liquid conductive silicone makes up for the high resistivity deficiency of the traditional resin conductive material, increases the conductive contact area between the conductive ring and the inner frame, makes it easier to conduct current, reduces the technical requirements for the conductive ring resin conductive material, and reduces costs;

[0025] 5. By shortening the electrical conduction distance between the elastomer and the shaft in the liquid-cured conductive silicone, the shaft current can be quickly guided and released. The shaft current is immediately guided outward from the elastomer and released, which can improve the working stability of the motor at high power. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a perspective view of an omnidirectional elastic high-conductivity split ring according to Example 1;

[0027] FIG2 is a perspective view of the omnidirectional elastomer high-conductivity split ring of Example 1 without the gasket;

[0028] FIG3 is a perspective view of the omnidirectional elastic high-conductivity split ring of Example 1 without the gasket and the conductive ring;

[0029] FIG4 is a partial cross-sectional view of the omnidirectional elastic high-conductivity split ring of Example 1;

[0030] FIG5 is a cross-sectional view of section AA in FIG4 ;

[0031] FIG6 is a cross-sectional view of an omnidirectional elastic high-conductivity split ring according to Example 2;

[0032] FIG7 is a cross-sectional view of an omnidirectional elastic high-conductivity split ring according to Example 3;

[0033] Among them, 1-exoskeleton, 2-gasket, 3-lip, 4-conductive ring, 5-flow groove, 6-spring, 7-arc surface, 8-center hole, 9-locating pin, 10-gap, 11-conductive silicone filling groove, 12-conductive silicone, 13-arc surface where conductive silicone contacts the shaft, 14-gap, 15-conductive hole, 16-shaft, 17-metal guide rod, 18-through hole. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described in the following in conjunction with the accompanying drawings in the form of multiple embodiments.

[0035] Example 1:

[0036] Referring to Figures 1 to 5, this embodiment discloses an omnidirectional elastomer high-conductivity split ring, including an exoskeleton 1 made of metal material, a gasket 2 made of metal material, and a diversion component tightly pressed by the exoskeleton 1 and the gasket 2, the diversion component including a conductive ring 4, eight lips 3 arranged in a fan-shaped annular array on the periphery of the shaft 16, a conductive silicone rubber 12 that is in direct contact with the periphery of the shaft 16 after liquid solidification, and a metal spring 6 with conductive ability that is bonded to the conductive silicone rubber 12 and can move radially along the shaft.

[0037] 4 and 5 , the conductive silicone 12 is filled in the lip 3 , and the structure of the conductive silicone 12 is stabilized by the lip 3 . The metal spring 6 can conduct the current guided by the conductive silicone 12 from the shaft 16 to the conductive ring 4 , and the conductive ring 4 releases the current outward through the gasket 2 and / or the exoskeleton 1 .

[0038] Referring to Figures 2 and 3, the exoskeleton 1, gasket 2, and conductive ring 4 are all annular, and the gap 14 is fitted on the high-speed shaft 16. The outer peripheral surface of the lip 3 is provided with a conductive hole 15 that cooperates with the metal spring 6. The conductive hole 15 is fitted with the metal spring 6. One end of the inner side of the metal spring 6 is directly bonded to the liquid conductive silicone 12 filled in the flow groove 5 of the lip 3 before solidification, and is integrally formed after the liquid conductive silicone 12 solidifies.

[0039] Referring to Figure 5, one outer end of the metal spring 6 is sleeved with the adjustment hole set in the conductive ring 4. An adjustable positioning pin 9 is provided between the metal spring 6 and the conductive ring 4. The positioning pin 9 is threadedly connected to the adjustment hole. The pressing force of the metal spring 6 on the conductive silicone 12 is adjusted along the radial direction of the shaft 16 to adapt to different shaft diameters of the rotating shaft 16 and adjust the contact pressing force.

[0040] 5 , the outer ring of the exoskeleton 1 is tightly fitted with the metal shell, and the inner ring of the exoskeleton 1 is tightly fitted with the gasket 2 through interference fit, both forming electrical conduction and guiding the current to be released outward.

[0041] 3 and 5 , the lip 3 and the inner ring of the conductive silicone 12 are both provided with an arcuate surface 7 that touches the outer ring of the shaft 16 . The arcuate surface 7 is in surface contact with the shaft 16 and maintains a small clamping force to maintain electrical conduction with a larger contact surface.

[0042] In a further embodiment, the lip 3 is made of rubber.

[0043] A further advantageous solution is that the lip 3 and the conductive silicone 12 can be radially pressed against the outer periphery of the shaft 16 under the elastic force of the metal spring 6 to maintain electrical conduction. They can jump along with the radial jump of the shaft and can move slightly along with the slight movement of the shaft 16. Even if the outer periphery of the shaft 16 is tapered, they can still maintain all-round stable contact and conduct the shaft current.

[0044] Example 2:

[0045] Referring to FIG6, this embodiment discloses an omnidirectional elastomer high-conductivity split ring, comprising an outer skeleton 1 made of metal material, a gasket 2 made of metal material, a guide assembly tightly pressed by the outer skeleton 1 and the gasket 2, the guide assembly comprising a conductive ring 4, eight lip edges 3 arranged in a fan-shaped annular array on the periphery of the shaft 16, a conductive silicone rubber 12 that is in direct contact with the periphery of the shaft 16 after liquid solidification, and a metal spring 6 with conductive ability that can move along the radial direction of the shaft and is bonded to the conductive silicone rubber 12. The technical feature that distinguishes this embodiment 2 from embodiment 1 is that the outer peripheral surface of the lip edge 3 is not provided with a metal spring. The conductive hole 15 is not a conductive hole 15 that matches the spring 6, but is integrally injection-molded with the metal spring 6, and the inner end of the metal spring 6 is directly bonded and contacted with the conductive silicone 12 before the liquid solidifies, and is integrally formed after the conductive silicone 12 liquid solidifies. The advantages of this implementation are: the metal spring 6 and the lip 3 structure are more firmly connected, and the inner end of the metal spring 6 will not be integrally formed at the perforation as in Example 1. When the spring 6 is subjected to high-frequency radial bouncing of the shaft, vibration stretching is reduced, thereby reducing the generation of debris by the conductive silicone 12 after solidification, thereby ensuring the stability and safety of the external environment of the motor shaft 16.

[0046] Example 3:

[0047] Referring to Figure 7, this embodiment discloses an all-round elastomer high-conductivity split ring, including an exoskeleton 1 made of metal material, a gasket 2 made of metal material, and a guide assembly tightly pressed by the exoskeleton 1 and the gasket 2, the guide assembly including a conductive ring 4, eight lips 3 arranged in a fan-shaped annular array on the outer periphery of the shaft 16, a conductive silicone 12 that is in direct contact with the outer periphery of the shaft 16 after liquid solidification, and a metal spring 6 with conductive ability that is bonded to the conductive silicone 12 and can move radially along the axis. The technical feature that distinguishes this embodiment 3 from embodiment 1 is that the elastomer adopts a metal guide rod 17 to increase the outward discharge efficiency of the conductive silicone 12, the metal guide rod 17 is sleeved with the through hole 18 in the center of the positioning pin 9, and a spring 6 is also sleeved between the metal guide rod 17 and the positioning pin 9. The advantage of this implementation is that it ensures that the metal guide rod 17 can slide radially and maintain the pressing force on the conductive silicone 12 to hold the high-speed rotating shaft 16 tightly.

[0048] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes, modifications, substitutions and variations can be made within the scope of knowledge possessed by ordinary technicians in this field without departing from the spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An omnidirectional elastic high-conductivity split ring, comprising an outer frame made of metal material, a gasket made of metal material, and a flow guide component tightly compressed by the outer frame and the gasket, wherein the outer frame, the gasket, and the conductive ring are all annular and are sleeved on a high-speed shaft with clearance fit. Features: The flow guide assembly includes a conductive ring, a plurality of annular arrays arranged on the lip of the shaft periphery, conductive silicone that is in direct contact with the shaft periphery after liquid solidification, and an elastic body with conductive ability that is bonded to the conductive silicone and can move radially along the shaft.

2. The omnidirectional elastic high-conductivity split ring according to claim 1, Features: The conductive silicone is filled in the lip, and the lip stabilizes the conductive silicone structure. The elastomer can conduct the current guided by the conductive silicone from the shaft to the conductive ring, and the conductive ring releases it outward through the gasket and / or the outer frame.

3. The omnidirectional elastic high-conductivity split ring according to claim 2, Features: The lip edge and the inner ring of the conductive silicone are both provided with arc-shaped surfaces that touch the outer ring of the shaft, and the arc-shaped surfaces are in contact with the shaft and maintain a small clamping force.

4. The omnidirectional elastic high-conductivity split ring according to claim 3, Features: The outer peripheral surface of the lip is provided with a conductive hole that matches the elastomer, and the elastomer is inserted into the conductive hole. One inner end of the elastomer is directly bonded and contacted with the liquid conductive silicone before curing filled in the lip flow groove, and the conductive silicone liquid is cured to form an integral part.

5. The omnidirectional elastic high-conductivity split ring according to claim 4, Features: One end of the outer side of the elastic body is sleeved and matched with the adjustment hole provided in the conductive ring.

6. The omnidirectional elastic high-conductivity split ring according to claim 5, Features: An adjustable positioning pin is arranged between the elastic body and the conductive ring. The positioning pin is arranged in the adjustment hole. The positioning pin adjusts the pressing force of the elastic body on the conductive silicone rubber along the radial direction of the shaft.

7. The omnidirectional elastic high-conductivity split ring according to claim 4, Features: The elastic body adopts a metal spring, and the lip edge and the conductive silicone can be radially pressed on the outer periphery of the shaft under the elastic force of the spring to maintain electrical conduction.

8. The omnidirectional elastic high-conductivity split ring according to claim 4, Features: The elastic body adopts a metal guide rod, and the metal guide rod is sleeved and matched with the through hole in the center of the positioning pin, and a spring is sleeved between the metal guide rod and the positioning pin.

9. The omnidirectional elastic high-conductivity split ring according to claim 1, Features: The outer ring of the exoskeleton is tightly matched with the metal shell, and the inner ring of the exoskeleton is tightly matched with the gasket through interference fit, both of which constitute electrical conduction and guide the current to be released outward.

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