A friction combined transmission device of electrothermal extrusion disc magnetorheological and electromagnetic bearing

Abstract

The invention discloses an electric heating extrusion disc magnetorheological and electromagnetic bearing friction combined transmission device, including a driving shaft, a driven shaft and a transmission housing, the part of the driving shaft located in the driven housing is expanded to form a transmission section; two armature bushes are symmetrically arranged on the transmission section, and a guide column and a compression shape memory alloy spring are arranged in the middle of the inner side of the armature bush; a liquid containing tank is arranged on the outer side of the armature ring, and the liquid containing tank is filled with magnetorheological fluid; an extrusion disk is arranged between the two ends of the transmission section and the left end cover and the right end cover respectively, and a guide rod and an extrusion shape memory alloy spring are arranged on the side of the extrusion disk close to the transmission section; the gap between the extrusion disk close to the left end cover and the left end cover and the gap between the extrusion disk close to the right end cover and the right end cover are also filled with magnetorheological fluid. The invention can reduce the influence of temperature on magnetorheological fluid, improve the transmission performance of the transmission device, ensure the stability of torque transmission, fully transform and utilize thermal energy, and reduce energy waste.

Description

Technical Field

[0001] The invention relates to the technical field of power transmission, and in particular to a friction combined transmission device of an electrothermal extrusion disc magnetorheological and electromagnetic bearing bush. Background Art

[0002] Magnetorheological fluid is a solid-liquid two-phase intelligent material whose morphology and performance are constrained and controlled by an external magnetic field. It is a special non-colloidal suspension formed by micron-sized magnetic particles uniformly distributed in a base liquid and a surfactant. Its excellent performance is manifested in that under the action of an external magnetic field, the magnetorheological fluid completes a reversible transformation from liquid to viscoplastic in milliseconds. In the process of increasing magnetic induction intensity, the apparent viscosity of these fluids can show a change of several orders of magnitude, has a certain shear yield strength, and can be continuously controlled by an external magnetic field. Shape memory alloys are new intelligent materials. Shape memory alloys with a certain initial shape will undergo a certain degree of deformation under certain conditions, and will undergo reverse deformation by appropriately changing the temperature, so that the material returns to its initial shape. In the process of shape recovery, if the shape memory alloy is constrained, it will generate a large restoring force, and its restoring force can be used to do external work;

[0003] Based on the excellent performance of continuous control, reversible transformation and rapid response of magnetorheological fluid, it has a wide range of application scenarios in the field of transmission devices. For example, the "multi-plate magnetorheological fluid electromagnetic clutch" disclosed in CN103603891A adopts a multi-plate structure and uses magnetorheological fluid as a medium to fill the gaps between multiple master and slave friction plates of the electromagnetic clutch to form multiple magnetorheological fluid working annular surfaces. The gap magnetic field has a large intensity, reasonable distribution, large transmission torque, compact structure, good rigidity, and convenient installation and maintenance; the structure is simple, the reliability is high, the transmission is stable, and it is suitable for various small and medium-sized automation equipment and servo transmission devices. For example, the "magnetorheological fluid soft start device" disclosed in CN102278446A first transmits torque through the magnetorheological fluid medium when starting, and then smoothly transitions to gear transmission when the start is smooth; it not only solves the impact problem of hard start, especially the problem of starting with load, but also ensures the reliability of transmission after the start is smooth. For example, CN110360248A discloses a "magnetorheological brake capable of recovering structural motion energy". When the brake shaft drives the rotor yoke and permanent magnet to rotate, a rotating magnetic field that cuts the stator winding is generated, and an induced current that can be output to the outside is generated in the stator winding. This magnetorheological brake can not only recover structural motion energy, but also has a compact structure and few applicable restrictions. For example, CN103591234A discloses a "wedge-shaped extrusion soft start device based on magnetorheological fluid and shape memory alloy". This device utilizes the extrusion strengthening effect of magnetorheological fluid to improve the transmission power of the soft start device; at the same time, the memory alloy assists in transmitting torque, making the transmission performance of the soft start device more reliable.

[0004] The above patents use extruded magnetorheological fluid to increase the torque transmitted by the device, or use the friction of the centrifugal armature shoe to increase the torque transmitted by the device, or use structural stacking to increase the torque transmitted; but they still cannot overcome the limited torque transmission of magnetorheological fluid; they cannot effectively compensate for the problem of decreased torque transmission due to increased temperature and decreased performance of magnetorheological fluid; they cannot automatically and adaptively transmit torque according to the speed. At the same time, the energy converted from the heat generated by the transmission device is directly discarded, resulting in a waste of energy, and will also reduce the transmission efficiency of the transmission device. The shape memory effect of shape memory alloy can be used to compensate for the decreased performance of magnetorheological fluid caused by temperature rise, and can also absorb and utilize the heat energy generated by the transmission device. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problems that the magnetorheological fluid has limited torque transmission, performance decreases with increasing temperature, poor stability, cannot automatically and adaptively transmit torque according to the rotational speed, transmission efficiency is reduced, and energy waste is caused. An electric heating extrusion disc magnetorheological and electromagnetic bearing friction combined transmission device is provided, which can reduce the influence of excessive temperature on the magnetorheological fluid. At the same time, the extrusion force generated by the shape memory alloy spring causes the magnetorheological fluid to produce an extrusion strengthening effect, effectively improving the transmission performance of the transmission device and ensuring the stability of torque transmission; and the heat generated by the excitation coil is conducted to the shape memory alloy spring, and the extrusion force is generated through the temperature shape memory effect of the shape memory alloy to act externally, thereby fully converting and utilizing thermal energy and reducing energy waste.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: an electric hot extrusion disc magnetorheological and electromagnetic bearing friction combined transmission device, including a driving shaft, a driven shaft and a transmission housing, the transmission device housing includes a left end cover, a driven cylinder and a right end cover connected in sequence; the driving shaft passes through the right end cover and extends into the housing, and is connected to the left end cover and the right end cover through bearings, and the part of the driving shaft located in the driven housing is expanded to form a transmission section; the driven shaft is fixedly connected to the left end cover; coil grooves are respectively provided around the transmission section near both ends, and an excitation coil is respectively wound in the two coil grooves; it is characterized in that: two armature shoes are symmetrically provided on the transmission section, the two armature shoes are movably connected, and during the radial movement of the armature shoes along the transmission section, the two armature shoes start The two armatures are finally connected together. When the two armature shoes are attached to the transmission section, an armature ring can be formed, and there is a gap between the armature ring and the driven cylinder. A guide column is provided in the middle of the inner side of the armature shoe. On the transmission section, a first guide groove is provided at a position corresponding to the guide column. One end of the guide column is connected to the armature shoe, and the other end extends into the first guide groove and is connected with the transmission section in a sliding fit. A compression shape memory alloy spring is provided between the guide column and the first guide groove. A liquid containing groove is provided around the armature ring in the middle of the outer side of the armature ring, and magnetorheological fluid is filled in the liquid containing groove. An armature sealing ring is provided around the armature ring on both sides of the liquid containing groove, and the armature sealing ring can always close the gap between the armature shoe and the driven cylinder during the axial movement of the armature shoe along the transmission section.

[0007] An extrusion plate is provided between the two ends of the transmission section and the left end cover and the right end cover respectively. The extrusion plate is sleeved on the driving shaft and can move along the driving shaft. When the extrusion plate is in contact with the transmission section, there is a gap between the extrusion plate and the left end cover and the right end cover respectively. An extrusion sealing ring is provided between the outer edge of the extrusion plate and the driven cylinder. A plurality of guide rods are provided around the extrusion plate on one side close to the transmission section. A second guide groove is provided on the transmission section at a position corresponding to the guide rod. One end of the guide rod is connected to the extrusion plate, and the other end extends into the second guide groove and is connected to the transmission section in a sliding manner. An extrusion shape memory alloy spring is provided between the guide rod and the second guide groove. Magnetorheological fluid is also filled in the gaps between the extrusion plate close to the left end cover and the left end cover, and between the extrusion plate close to the right end cover and the right end cover.

[0008] Furthermore, two ends of the armature shoe are respectively flush with two ends of the transmission section.

[0009] Furthermore, the outer side of the armature sealing ring is fixedly connected to the driven cylinder, and a sealing groove is provided on the outer side of the armature shoe corresponding to the position of the armature sealing ring. The inner side of the armature sealing ring extends into the sealing groove and is tightly attached to the side wall of the sealing groove.

[0010] Furthermore, a heat conduction hole is opened on the driving shaft along its axial direction, the right end of the heat conduction hole passes through the right end of the driving shaft, and the left end extends to the middle of the transmission section; the bottoms of the two first guide grooves are connected to the heat conduction hole through the first heat transfer hole, and the bottoms of each second guide groove are connected to the first heat transfer hole through the second heat transfer hole.

[0011] Furthermore, a brush slip ring is provided on the driving shaft, and both ends of the excitation coil are connected to the brush slip ring through a wire, wherein one end of the wire is connected to the brush slip ring, and the other end is connected to the brush slip ring after passing through the second heat transfer hole, the first heat transfer hole and the heat conduction hole.

[0012] Furthermore, the diameter of the guide rod is smaller than the diameter of the second guide groove, and its outer end is enlarged to form a slider, the diameter of the slider is consistent with the diameter of the second guide groove, and fits with the side wall of the guide groove; the extruded shape memory alloy spring is sleeved on the guide rod, the inner end of which is connected to the bottom of the second guide groove, and the outer end is connected to the slider.

[0013] Furthermore, a liquid injection hole is respectively provided on the left end cover, the driven cylinder and the right end, wherein the liquid injection hole on the driven cylinder is connected to the liquid containing tank; and a liquid injection screw plug is provided on the liquid injection hole.

[0014] Furthermore, a slot and a plate are respectively provided on one side where the two armature shoes are connected, wherein the slot passes through both ends of the armature shoe, and the plate extends to be flush with both ends of the armature shoe; the plate is inserted into the slot, and its two sides are respectively fitted with two side walls of the slot, and during the radial movement of the armature shoe along the transmission section, the plate is always located in the slot.

[0015] Furthermore, a sealing ring is provided between the guide column and the first guide groove.

[0016] Furthermore, a blind cover is provided on the outer side of the left end cover, the blind cover is fixedly connected to the left end cover and closes the left end cover, and the driven shaft is fixedly connected to the blind cover; a transparent cover is provided on the outer side of the right end cover, the transparent cover is sleeved on the driving shaft and fixedly connected to the right end cover, and a felt ring is provided between the transparent cover and the driving shaft.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. Combining electromagnetic friction transmission with magnetorheological shear transmission can transmit greater torque; at high temperatures, the compression force generated by the shape memory alloy spring can also make up for the decrease in the torque transmitted by the device, thereby greatly improving the reliability and stability of torque transmission.

[0019] 2. The magnetic field generated by the excitation coil can attract the armature shoe, thereby pressing the armature shoe against the cylindrical shell, and the friction torque generated further increases the transmission of the transmission torque; at the same time, the heat generated by the heating of the excitation coil is transferred to the compression shape memory alloy spring, so that the shape memory alloy spring pushes the armature shoe, thereby enhancing the squeezing force of the armature shoe on the inner wall of the cylindrical shell, further improving the transmission torque transmission, thereby ensuring the working stability of the transmission under high temperature working conditions.

[0020] 3. The heat generated by the excitation coil is transferred to the extrusion shape memory alloy spring, which pushes the extrusion plate. The extrusion plate squeezes the magnetorheological fluid to make the magnetorheological fluid produce extrusion strengthening phenomenon. By squeezing the solidified magnetorheological fluid, the shear yield stress of the magnetorheological fluid can be significantly improved; as the temperature continues to rise, the extrusion force of the extrusion shape memory alloy spring on the magnetorheological fluid becomes greater, and the extrusion strengthening of the magnetorheological fluid becomes more obvious. The higher the temperature, the greater the torque transmitted by the transmission device, which further compensates for the torque lost due to the decline in the performance of the magnetorheological fluid due to the increase in temperature, thereby further ensuring the reliability and stability of braking.

[0021] 4. The heat generated by the excitation coil is transferred to the shape memory alloy spring, so that the heat energy dissipated by the coil is converted into mechanical energy using the shape memory alloy, which reduces the attenuation of the magnetorheological fluid performance due to excessive temperature, enhances the transmission performance of the transmission device under high temperature conditions, and fully converts and utilizes thermal energy, reducing energy waste; and the transmission of torque is automatically adjusted according to the temperature, thereby greatly improving the effectiveness of torque transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 for Figure 1 Cross-sectional view along A-A.

[0024] Figure 3 It is a structural schematic diagram of the armature shoe in the present invention.

[0025] In the figure: 1—driving shaft, 2—driven shaft, 3—left end cover, 4—driven cylinder, 5—right end cover, 6—transmission section, 7—excitation coil, 8—armature shoe, 9—compression shape memory alloy spring, 10—magnetorheological fluid, 11—armature sealing ring, 12—extrusion disk, 13—extrusion sealing ring, 14—guide rod, 15—extrusion shape memory alloy spring, 16—heat conduction hole, 17—brush slip ring, 18—liquid injection plug, 19—blocking cover, 20—transparent cover. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Example: See Figure 1 , Figure 2 as well as Figure 3 , an electrothermal extrusion disc magnetorheological and electromagnetic bearing friction combined transmission device, comprising a driving shaft 1, a driven shaft 2 and a transmission housing; the transmission housing comprises a left end cover 3, a driven cylinder 4 and a right end cover 5 connected in sequence; wherein the left end cover 3 and the right end cover 5 are fixedly connected to the driven cylinder 4 by connecting screws, and a bearing hole is respectively provided in the middle of the left end cover 3 and the right end cover 5, and the bearing hole is arranged coaxially with the driven cylinder 4. The driving shaft 1 passes through the right end cover 5 and then extends into the housing, and is connected to the left end cover 3 and the right end cover 5 through a bearing, and the part of the driving shaft 1 located in the driven housing is expanded to form a transmission section 6; the driven shaft 2 is fixedly connected to the left end cover 3; the bearing is installed in the bearing holes of the left end cover 3 and the right end cover 5; sealing rings are provided between the inner side of the bearing and the driving shaft 1 and between the outer side of the bearing and the hole wall of the bearing hole. In specific implementation, a blind cover 19 is provided on the outside of the left end cover 3, the blind cover 19 is fixedly connected to the left end cover 3 and closes the left end cover 3, and the driven shaft 2 is fixedly connected to the blind cover 19; a transparent cover 20 is provided on the outside of the right end cover 5, the transparent cover 20 is sleeved on the driving shaft 1 and fixedly connected to the right end cover 5, and a felt ring is provided between the transparent cover 20 and the driving shaft 1. Thus, a closed cavity is formed inside the transmission housing.

[0028] Coil grooves are provided around the transmission section 6 near both ends, and an excitation coil 7 is wound in each of the two coil grooves. Two armature shoes 8 are symmetrically provided on the transmission section 6, wherein the two ends of the armature shoes 8 are respectively flush with the two ends of the transmission section 6, so that the magnetic flux that can pass through the armature shoes 8 is sufficient to increase the electromagnetic force on the armature. The two armature shoes 8 are movably connected, and during the radial movement of the armature shoes 8 along the transmission section 6, the two armature shoes 8 are always connected together. When the two armature shoes 8 are attached to the transmission section 6, an armature ring (shaft sleeve) can be formed, and there is a gap between the armature ring and the driven cylinder 4. During the processing, a slot and a card plate are provided on one side where the two armature shoes 8 are connected. The slot runs through both ends of the armature shoe 8, and the card plate extends to be flush with both ends of the armature shoe 8. The card plate is inserted into the slot, and its two sides are respectively fitted with the two side walls of the slot, and the card plate is always located in the slot during the radial movement of the armature shoe 8 along the transmission section 6. In this way, the two armature shoes 8 can move relative to each other and are always connected together. A guide column is provided in the middle of the inner side of the armature shoe 8, and a first guide groove is provided on the transmission section 6 corresponding to the position of the guide column. One end of the guide column is connected to the armature shoe 8, and the other end extends into the first guide groove and is connected to the transmission section 6 in a sliding fit. A sealing ring is provided between the guide column and the first guide groove to provide a better sealing effect between the guide column and the side wall of the first guide groove. In order to ensure the stability of the armature shoe 8 during movement, the middle part of its inner side protrudes inward to form a positioning boss. The positioning boss is arc-shaped and its axis first coincides with the axis of the armature shoe 8 and extends to the two side edges of the armature shoe 8. At the position of the transmission section 6 corresponding to the positioning boss, a positioning groove corresponding to the positioning boss is provided. The positioning boss extends into the positioning groove and is connected to the positioning groove by sliding fit. During the radial movement of the armature shoe 8 along the transmission section 6, the positioning boss is always located in the positioning groove, thereby preventing the armature shoe 8 from axial movement. A clamping shape memory alloy spring 9 is provided between the guide column and the first guide groove, through which the armature can be driven to move radially along the transmission section 6; as an embodiment, the two ends of the clamping shape memory alloy spring 9 are connected to the guide column and the bottom of the first guide groove.

[0029] A liquid containing groove is provided around the armature ring in the middle of the outer side, and the liquid containing groove is filled with magnetorheological fluid 10. An armature sealing ring 11 is provided around the armature ring on both sides of the liquid containing groove, and the armature sealing ring 11 can always close the gap between the armature shoe 8 and the driven cylinder 4 during the axial movement of the armature shoe 8 along the transmission section 6. During manufacturing, the outer side of the armature sealing ring 11 is fixedly connected to the driven cylinder 4, and a sealing groove is provided on the outer side of the armature shoe 8 corresponding to the position of the armature sealing ring 11, and the inner side of the armature sealing ring 11 extends into the sealing groove and is tightly attached to the side wall of the sealing groove; thereby achieving a better sealing effect during the movement of the armature ring and making the processing more convenient.

[0030] An extrusion disc 12 is provided between the two ends of the transmission section 6 and the left end cover 3 and the right end cover 5, respectively. The surface of the extrusion disc 12 is covered with an amorphous wear-resistant and high-magnetic-permeability functional coating (Fe-Si-B-Cr-CW) by cold spraying or laser cladding technology to ensure the wear resistance of the extrusion disc 12. The extrusion disc 12 is sleeved on the driving shaft 1 and can move along the driving shaft 1. When the extrusion disc 12 is in contact with the transmission section 6, there is a gap between the extrusion disc 12 and the left end cover 3 and the right end cover 5. An extrusion sealing ring 13 is provided between the outer edge of the extrusion disc 12 and the driven cylinder 4 (and between the inner edge and the driving shaft 1); wherein the extrusion sealing ring 13 is fixedly connected to the extrusion disc 12, thereby ensuring the sealing effect of the extrusion disc 12 during movement. Several guide rods 14 are arranged around the extrusion plate 12 on one side close to the transmission section 6. A second guide groove is arranged on the transmission section 6 at the position corresponding to the guide rod 14. One end of the guide rod 14 is connected to the extrusion plate 12, and the other end extends into the second guide groove and is connected to the transmission section 6 in a sliding manner. In order to facilitate assembly, the extrusion plate 12 is fixedly connected to the guide rod 14 through a connecting pin. An extrusion shape memory alloy spring 15 is arranged between the guide rod 14 and the second guide groove, and the extrusion plate 12 can be driven to move along the axial direction of the driving shaft 1 through the extrusion shape memory alloy spring 15. Among them, the diameter of the guide rod 14 is smaller than the diameter of the second guide groove, and its outer end is enlarged to form a slider, the diameter of the slider is consistent with the diameter of the second guide groove, and fits with the side wall of the guide groove; the extrusion shape memory alloy spring 15 is sleeved on the guide rod 14, and its inner end is connected to the bottom of the second guide groove, and the outer end is connected to the slider; in this way, the extrusion shape memory alloy has a better effect of pushing the extrusion plate 12. The gaps between the extrusion disc 12 near the left end cover 3 and the left end cover 3 and between the extrusion disc 12 near the right end cover 5 and the right end cover 5 are also filled with magnetorheological fluid 10. A liquid injection hole is respectively provided on the left end cover 3, the driven cylinder 4 and the right end, wherein the liquid injection hole on the driven cylinder 4 is connected to the liquid containing tank; a liquid injection screw plug 18 is provided on the liquid injection hole; thereby, the magnetorheological fluid 10 is easily added.

[0031] A heat-conducting hole 16 is provided on the driving shaft 1 along its axial direction, the right end of the heat-conducting hole 16 passes through the right end of the driving shaft 1, and the left end extends to the middle of the transmission section 6. The bottom of the two first guide grooves is connected to the heat-conducting hole 16 through the first heat-conducting hole, and the bottom of each second guide groove is connected to the first heat-conducting hole through the second heat-conducting hole; so that the heat generated by the entire transmission device (especially the excitation coil 7) can be quickly transferred to the shape memory alloy spring, thereby improving the corresponding efficiency of the shape memory alloy spring. As an optimization, the bottom of the coil groove is connected to each second guide groove through the third heat-conducting hole, so that the heat emitted by the excitation coil 7 can be more directly and quickly transferred to the shape memory alloy spring, so that the shape memory alloy spring responds faster; a wire hole is also provided on the guide rod 14, and the two ends of the wire hole correspond to the positions of the third heat-conducting hole and the second heat-conducting hole respectively. A brush slip ring 17 is provided on the driving shaft 1, and both ends of the excitation coil 7 are connected to the brush slip ring 17 through a wire, wherein one end of the wire is connected to the brush slip ring 17, and the other end is connected to the brush slip ring 17 after passing through the third heat transfer hole, the wire hole, the second heat transfer hole, the first heat transfer hole and the heat conduction hole 16. In specific implementation, a sealing screw plug is also provided at the right end of the driving shaft 1, and the heat transfer hole is closed by the sealing screw plug, thereby improving the sealing effect of the entire transmission device.

[0032] In order to enable the magnetorheological fluid 10 in each working gap to produce magnetorheological effect, the gap between the extrusion plate 12 and the left end cover 3 and the right end cover 5 and the depth of the liquid containing groove on the armature shoe 8 should be within the effective working gap range of the magnetorheological fluid 10 (for example: when the shear yield stress of the magnetorheological fluid 10 is 58.5 kPa, the viscosity is 0.23 Pa·s, and the controllable transmission ratio is 20, the effective gap is 1.149 mm).

[0033] During work:

[0034] 1. In the initial state, the driving shaft 1 rotates under the drive of the prime mover. When the excitation coil 7 is not energized, the magnetic particles in the magnetorheological fluid 10 are in a free state in the base fluid. The viscous torque of the magnetorheological fluid 10 under zero magnetic field cannot drive the driven shaft 2 to rotate. When the temperature is less than 60°C, the shape memory alloy spring does not generate driving force, and the transmission device is in a separated state.

[0035] 2. When the excitation coil 7 is energized, the magnetic flux generated by the excitation coil 7 passes through the magnetorheological fluid 10, and the magnetic particles in the magnetorheological fluid 10 are arranged in a chain structure along the direction of the magnetic flux. The torque transmitted by the shear stress of the chain structure can drive the transmission housing and the driven shaft 2 to rotate; and the magnetic field intensity is controlled by the current. As the magnetic field intensity increases, the degree of chaining of the magnetorheological fluid 10 becomes more significant. When the magnetorheological fluid 10 reaches magnetic saturation, the torque that the magnetorheological fluid 10 can transmit reaches the maximum value. At the same time, the magnetic lines of force generated by the excitation coil 7 pass through the armature shoe 8 to generate electromagnetic force, which drives the armature shoe 8 to press against the inner wall of the driven cylinder 4, thereby generating friction torque, and the driven shaft 2 is driven to rotate by the combined action of the magnetorheological fluid 10 and the electromagnetic friction torque; and, under the action of centrifugal force, the armature shoe 8 increases the pressing force, thereby improving the transmission performance of the transmission device.

[0036] 3. During the continuous transmission process, the working temperature of the magnetorheological fluid 10 in the transmission device gradually rises. When it rises to a certain temperature (such as 60°C), the magnetic chain structure stability composed of magnetic particles in the magnetorheological fluid 10 begins to decrease, and the transmission performance also decreases. The decrease is more significant as the temperature increases. However, at this time, the compression shape memory alloy spring 9 and the extrusion shape memory alloy spring 15 produce a shape memory effect driven by thermal energy. The extrusion shape memory alloy spring 15 pushes the extrusion disk 12 to move outward, thereby causing the extrusion disk 12 to squeeze the magnetorheological fluid 10. Through the extrusion strengthening of the magnetorheological fluid 10, the magnetorheological fluid 10 can overcome the stagnation of the shear yield stress growth caused by magnetic saturation, and can effectively improve the shear yield stress of the magnetorheological fluid 10, thereby further improving the transmission performance of the transmission device; at the same time, the compression shape memory alloy spring 9 pushes the armature shoe 8 to move outward and further squeeze the driven cylinder 4, thereby increasing the friction between the two, thereby increasing the friction torque, and further improving the transmission performance of the transmission device. In this process, the heat generated by the entire device (heat generated by the excitation coil 7) can be quickly transferred to the compression shape memory alloy spring 9 and the extrusion shape memory alloy spring 15 through the heat conduction holes 16 and the heat transfer holes, thereby greatly improving the corresponding efficiency of the shape memory alloy.

[0037] In addition, during the entire process, the transmission of torque is automatically adjusted according to the temperature, thereby greatly improving the effectiveness of torque transmission.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the technical solution. Those skilled in the art should understand that those modifications or equivalent substitutions of the technical solution of the present invention that do not depart from the purpose and scope of the technical solution should be included in the scope of the claims of the present invention.

Claims

1. An electric hot extrusion disc magnetorheological and electromagnetic bearing friction combined transmission device, comprising a driving shaft, a driven shaft and a transmission housing, wherein the transmission housing comprises a left end cover, a driven cylinder and a right end cover which are connected in sequence; the driving shaft passes through the right end cover and then extends into the housing, and is connected to the left end cover and the right end cover through a bearing, and the portion of the driving shaft located in the driven housing is expanded to form a transmission section; the driven shaft is fixedly connected to the left end cover; coil grooves are respectively arranged around the transmission section near both ends, and an excitation coil is respectively wound in the two coil grooves; the characteristics are as follows: Two armature shoes are symmetrically arranged on the transmission section, and the two armature shoes are movably connected. During the radial movement of the armature shoes along the transmission section, the two armature shoes are always connected together. When the two armature shoes are attached to the transmission section, an armature ring can be formed, and there is a gap between the armature ring and the driven cylinder. A guide column is arranged in the middle of the inner side of the armature shoe, and a first guide groove is arranged on the transmission section corresponding to the position of the guide column. One end of the guide column is connected to the armature shoe, and the other end extends into the first guide groove and is connected to the transmission section in a sliding manner. A compression-shaped groove is arranged between the guide column and the first guide groove. A memory alloy spring; a liquid containing groove is provided around the armature ring in the middle of the outer side of the armature ring, and the liquid containing groove is filled with magnetorheological fluid; an armature sealing ring is provided around the armature ring on both sides of the liquid containing groove, and the armature sealing ring can always close the gap between the armature shoe and the driven cylinder during the axial movement of the armature shoe along the transmission section; the outer side of the armature sealing ring is fixedly connected to the driven cylinder, and a sealing groove is provided on the outer side of the armature shoe at a position corresponding to the armature sealing ring, and the inner side of the armature sealing ring extends into the sealing groove and is tightly attached to the side wall of the sealing groove; An extrusion plate is provided between the two ends of the transmission section and the left end cover and the right end cover respectively. The extrusion plate is sleeved on the driving shaft and can move along the driving shaft. When the extrusion plate is fitted with the transmission section, there is a gap between the extrusion plate and the left end cover and the right end cover respectively. An extrusion sealing ring is provided between the outer edge of the extrusion plate and the driven cylinder. A plurality of guide rods are provided around the extrusion plate on one side close to the transmission section. A second guide groove is provided on the transmission section at a position corresponding to the guide rod. One end of the guide rod is connected to the extrusion plate, and the other end extends into the second guide groove. The invention relates to a heat transfer device for driving a motor, wherein the heat transfer hole is provided on the driving shaft and the heat transfer hole is provided on the driving shaft. The ...

2. The electrothermal extrusion disc magnetorheological and electromagnetic bearing friction combined transmission device according to claim 1 is characterized by: The two ends of the armature shoe are respectively flush with the two ends of the transmission section.

3. The electrothermal extrusion disc magnetorheological and electromagnetic bearing friction combined transmission device according to claim 1 is characterized in that: A brush slip ring is provided on the driving shaft, and both ends of the excitation coil are connected to the brush slip ring through a wire, wherein one end of the wire is connected to the brush slip ring, and the other end is connected to the brush slip ring after passing through the second heat transfer hole, the first heat transfer hole and the heat conduction hole.

4. The electrothermal extrusion disc magnetorheological and electromagnetic bearing friction combined transmission device according to claim 1 is characterized in that: The diameter of the guide rod is smaller than the diameter of the second guide groove, and its outer end is enlarged to form a slider, the diameter of the slider is consistent with the diameter of the second guide groove, and fits with the side wall of the guide groove; the extruded shape memory alloy spring is sleeved on the guide rod, the inner end of which is connected to the bottom of the second guide groove, and the outer end is connected to the slider.

5. The electrothermal extrusion disc magnetorheological and electromagnetic bearing friction combined transmission device according to claim 1 is characterized in that: A liquid injection hole is respectively arranged on the left end cover, the driven cylinder and the right end cover, wherein the liquid injection hole on the driven cylinder is connected with the liquid containing tank; and a liquid injection screw plug is matched on the liquid injection hole.

6. The electrothermal extrusion disk magnetorheological and electromagnetic bearing friction combined transmission device according to claim 1 is characterized by: A slot and a card plate are respectively provided on one side where the two armature shoes are connected. The slot runs through both ends of the armature shoe, and the card plate extends to be flush with both ends of the armature shoe. The card plate is inserted into the slot, and its two sides are respectively fitted with the two side walls of the slot, and during the radial movement of the armature shoe along the transmission section, the card plate is always located in the slot.

7. The electrothermal extrusion disk magnetorheological and electromagnetic bearing friction combined transmission device according to claim 1 is characterized in that: A sealing ring is arranged between the guide column and the first guide groove.

8. The electrothermal extrusion disk magnetorheological and electromagnetic bearing friction combined transmission device according to claim 1 is characterized by: A blind cover is provided on the outer side of the left end cover, which is fixedly connected to the left end cover and closes the left end cover, and the driven shaft is fixedly connected to the blind cover; a transparent cover is provided on the outer side of the right end cover, which is sleeved on the driving shaft and fixedly connected to the right end cover, and a felt ring is provided between the transparent cover and the driving shaft.

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