CN110848283B - Temperature control round wedge-shaped magnetorheological fluid clutch - Google Patents
Temperature control round wedge-shaped magnetorheological fluid clutch Download PDFInfo
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- CN110848283B CN110848283B CN201911244221.2A CN201911244221A CN110848283B CN 110848283 B CN110848283 B CN 110848283B CN 201911244221 A CN201911244221 A CN 201911244221A CN 110848283 B CN110848283 B CN 110848283B
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- end cover
- clutch
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- magnetorheological fluid
- isolation baffle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D37/00—Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive
- F16D37/02—Clutches in which the drive is transmitted through a medium consisting of small particles, e.g. centrifugally speed-responsive the particles being magnetisable
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Abstract
The invention discloses a temperature-control round variable wedge magnetorheological fluid clutch, which comprises a driving shaft, a clutch shell, a driven shaft, an excitation coil and magnetorheological fluid, wherein the driving shaft is connected with the clutch shell; a coil groove is formed in the outer side of the clutch shell, the magnet exciting coil is installed in the coil groove, a plurality of isolation baffles are arranged on the outer side of the transmission section around the circumference of the transmission section, a first return spring is arranged on the outer side of each isolation baffle, and the magnetorheological fluid is filled in a gap between each isolation baffle and the inner wall of the shell; the inner sides of the isolation baffles are respectively provided with a centrifugal plate, each isolation baffle is also provided with a filter hole, a filter membrane is arranged in each filter hole, the driving shaft is also sleeved with two electric brush slip rings, one end of the excitation coil is connected with one of the electric brush slip rings after passing through the shape memory alloy temperature control switch, and the other end of the excitation coil is directly connected with the other electric brush slip ring. The invention has the advantages of larger maximum value of the transmitted torque, higher transmission efficiency, lower energy consumption and ensured stability in the transmission process.
Description
Technical Field
The invention relates to the technical field of clutches, in particular to a temperature-controlled round wedge-shaped magnetorheological fluid clutch.
Background
The magnetorheological fluid is a solid-liquid two-phase functional material with the shape and performance restricted and controlled by an external magnetic field; the material is a magnetic intelligent material, mainly comprises magnetic particles and base liquid, is controlled by an external magnetic field, and shows the property of Newtonian fluid in the absence of the external magnetic field; after the magnetic field is added, the viscosity of the magnetorheological fluid can change by several orders of magnitude in a very short time, and the magnetorheological fluid shows mechanical properties similar to those of a solid; the whole change process is rapid, continuous, controllable and reversible.
Based on the magneto-rheological effect of the magneto-rheological fluid, the magneto-rheological fluid can be widely applied to the clutch, for example, the 'communicated magneto-rheological clutch' disclosed in CN104019153A, when the magneto-rheological fluid is changed into a solid state under the action of a coil magnetic field, the whole shell and the output shaft are rotated under the action of the piston and the convex strip on the input shaft, and a plurality of U-shaped grooves can be set according to the load condition to improve the output torque. For example, patent CN105288876A discloses a "permanent magnet length variable magnetorheological fluid and friction composite soft landing device", which utilizes a permanent magnet to generate a magnetic field to excite the magnetorheological fluid to generate a magnetorheological effect, thereby controlling the braking torque of the soft landing device, and simultaneously utilizes the friction torque between a spring and a friction disk to assist deceleration landing; for example, the "double-disc type extrusion magnetorheological brake" disclosed in CN102562874A can not only increase the torque by increasing the current of the excitation coil, but also increase the current of the electromagnet, thereby increasing the normal stress generated by the magnetorheological fluid in the direction of the magnetic field, and greatly increasing the braking torque; for example, CN207470642U discloses a blade wedge extrusion magnetorheological clutch, which can effectively improve the maximum torque transmitted by the magnetorheological clutch and ensure the stability of the torque transmitted by the clutch. The wedge-shaped extrusion soft start device based on the magnetorheological fluid and the shape memory alloy disclosed in CN103591234A transmits torque through cooperation of the wedge-shaped extrusion and the shape memory alloy, so that the transmission performance of the soft start device is more reliable.
However, the shear yield stress generated by the magnetorheological fluid is limited, so that the maximum torque transmitted is greatly influenced by the magnetorheological fluid, and particularly, the performance of the magnetorheological fluid is gradually weakened along with the rise of the temperature under a high-temperature environment, so that the transmission requirement of the torque cannot be met; therefore, how to take measures to increase the shear yield stress of the magnetorheological fluid and increase the application occasions of the magnetorheological fluid becomes a technical problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the problems that the maximum value of the transmitted torque of the conventional transmission device is small, the transmission efficiency is low, the energy consumption is high, the automatic adjustment cannot be carried out according to the real-time temperature, and the stability is poor, and provides the temperature-controlled round-variable wedge-shaped magnetorheological fluid clutch which has the advantages of larger maximum value of the transmitted torque, higher transmission efficiency, capability of automatically adjusting the transmitted torque according to the real-time temperature, lower energy consumption and guarantee of the stability in the transmission process.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: a temperature control round wedge-shaped magnetorheological fluid clutch comprises a driving shaft, a clutch shell, a driven shaft, an excitation coil and magnetorheological fluid; the clutch shell comprises a clutch left end cover, a shell and a clutch right end cover which are sequentially connected, the driving shaft is fixedly connected with the clutch left end cover, the left end of the driven shaft penetrates through the clutch right end cover and then extends into the clutch shell, the left end of the driven shaft is connected with the clutch left end cover and the clutch right end cover through bearings, and the part of the driven shaft, which is positioned in the clutch shell, is expanded to form a transmission section; the middle part of the outer side of the clutch shell is provided with a coil groove which is wound by one circle, the excitation coil is arranged in the coil groove, the outer side of the coil groove is provided with a sealing sleeve, the sealing sleeve is sleeved on the clutch shell and is fixedly connected with the clutch shell, and the excitation coil is sealed in the coil groove; the method is characterized in that:
a plurality of isolation baffles are arranged around the transmission section at the outer side of the transmission section, and two sides of each isolation baffle extend to be correspondingly attached to the left end cover and the right end cover of the clutch; one end corresponding to each isolation baffle is fixedly connected with the transmission end to form a fixed end, and the other end forms a free end, wherein the free end of each isolation baffle extends above the fixed end of the adjacent isolation baffle; the outer side of each isolation baffle is respectively provided with a first return spring at a position close to the free end, the inner wall of the shell is respectively provided with a first spring groove corresponding to each first return spring, two ends of each first return spring are respectively fixedly connected with the groove bottom of each first spring groove and the isolation baffle, and the free end and the fixed end of each adjacent isolation baffle are tightly attached together under the action of the first return spring; the magnetorheological fluid is filled in a gap between the isolation baffle and the inner wall of the shell;
the inner sides of the isolation baffles are respectively provided with a centrifugal plate, the centrifugal plate is close to the free end of the isolation baffle, the length direction of the centrifugal plate is consistent with the axial direction of the transmission section, the width direction of the centrifugal plate is consistent with the radial direction of the transmission section, and the two ends of the centrifugal plate extend to be correspondingly attached to the left end cover and the right end cover of the clutch; the transmission section is provided with a containing groove corresponding to each centrifugal plate, the centrifugal plates are positioned in the containing groove, the middle part of the bottom of the containing groove is also provided with a second spring groove, a second reset spring is arranged in the second spring groove, two ends of the second reset spring are respectively fixedly connected with the centrifugal plates and the bottom of the containing groove, and under the action of the first reset spring, the centrifugal plates are in a contraction state, and the outer sides of the centrifugal plates are protruded out of the transmission section and tightly attached to the isolation baffle; each isolation baffle is also provided with a filtering hole, the filtering hole is positioned between the fixed end of the isolation baffle and the centrifugal plate, a filtering membrane is arranged in the filtering hole, and the basic liquid of the magnetorheological fluid can be separated from the magnetic particles through the filtering membrane;
and two electric brush slip rings are further sleeved on the driving shaft, one end of the excitation coil is connected with one of the electric brush slip rings after passing through the shape memory alloy temperature control switch, and the other end of the excitation coil is directly connected with the other electric brush slip ring.
Further, a sealing strip is arranged between the outer side of the centrifugal plate and the inner side of the isolation baffle and fixedly connected with the centrifugal plate.
Furthermore, two guide grooves are arranged at the bottom of the accommodating groove and distributed on two sides of the second spring groove; and a guide rod is respectively arranged on the inner side of the centrifugal plate corresponding to the two guide grooves, one end of the guide rod is fixedly connected with the centrifugal plate, and the other end of the guide rod extends into the guide grooves and is in clearance fit with the groove walls of the guide grooves.
Furthermore, a liquid injection hole is also arranged on the shell, and a liquid injection screw plug is arranged in the liquid injection hole in a matching way.
Furthermore, the shell and the isolation baffle are made of soft magnetic materials, and the left end cover and the right end cover are made of non-magnetic materials.
Furthermore, a bearing end cover is further sleeved on the driven shaft and fixedly connected with the right end cover.
Further, the shape memory alloy temperature control switch comprises a switch left end cover, a switch outer cylinder, a switch right end cover, a guide shaft, a resistance wire, a slip ring, a conductive slip sheet and a shape memory alloy spring; the switch left end cover, the switch outer barrel and the switch right end cover are all made of insulating materials and are sequentially connected together, the guide shaft is arranged in the switch outer barrel along the axial direction of the switch outer barrel, and two ends of the guide shaft are respectively connected with the switch left end cover and the switch right end cover; the resistance wire is of a cylindrical structure, extends into the switch outer cylinder from the left end of the switch outer cylinder, is embedded in the side wall of the switch outer cylinder, and has an inner wall flush with the inner wall of the switch outer cylinder; the sliding ring is sleeved on the guide shaft and is connected with the guide shaft in a sliding fit manner, a gap is formed between the outer side of the sliding ring and the outer cylinder of the switch, the conductive sliding sheet is arranged on the sliding ring and is made of an elastic material, and part of the conductive sliding sheet protrudes out of the sliding ring and is tightly attached to the outer cylinder of the switch; the shape memory alloy spring is positioned between the conductive sliding piece and the switch right end cover and is sleeved on the guide shaft, two ends of the shape memory alloy spring are respectively and fixedly connected with the conductive sliding piece and the switch right end cover, and a vent hole is formed in the switch outer cylinder corresponding to the position of the shape memory alloy spring; an input terminal and an output terminal are respectively arranged on the left end cover and the right end cover, the input terminal is connected with the conductive sliding sheet through a lead, and the output terminal is connected with one end of the resistance wire close to the left end cover of the switch; the input terminal is connected with one end of the excitation coil, and the output terminal is connected with the corresponding brush slip ring.
Furthermore, the two conductive sliding sheets are symmetrically distributed on two sides of the sliding ring; one end of the conductive sliding sheet is fixedly connected with the sliding ring, the other end of the conductive sliding sheet is tightly attached to the inner wall of the switch outer cylinder, and the fixed ends of the two conductive sliding sheets are connected together.
Compared with the prior art, the invention has the following advantages:
1. simple structure carries out automatic control through temperature detect switch to can realize that the automation of clutch opens and stops, and according to the torque size of ambient temperature automatically regulated transmission, thereby can be that the energy consumption of clutch is lower, and stability is better.
2. The isolation baffle is pushed by the centrifugal plate, so that the magnetorheological fluid working gap forms a plurality of wedge-shaped working gaps, and the magnetorheological effect can be increased; meanwhile, the base liquid in the magnetorheological fluid enters the centrifugal plate and the isolation baffle plate through the filtering membrane on the isolation baffle plate to form a sealed space, so that the volume fraction of magnetic particles in the magnetorheological fluid is improved, the shear yield stress of the magnetorheological fluid is obviously improved, the maximum transmission torque of the clutch is improved, and the transmission efficiency is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a sectional view taken along a-a of fig. 1.
Fig. 3 is a schematic structural diagram of the present invention in an operating state.
Fig. 4 is an enlarged view of a portion B in fig. 3.
FIG. 5 is a schematic structural view of a shape memory alloy temperature control switch.
Fig. 6 is a cross-sectional view taken along line C-C of fig. 5.
In the figure: 1-driving shaft, 201-left clutch end cover, 202-shell, 203-right clutch end cover, 204-transmission section, 3-driven shaft, 4-magnet exciting coil, 5-magnetorheological fluid, 6-sealing sleeve, 7-isolation baffle, 8-first return spring, 9-centrifugal plate, 10-second return spring, 11-filtering film, 12-brush sliding ring, 13-shape memory alloy temperature control switch, 131-left switch end cover, 132-switch outer cylinder, 133-right switch end cover, 134-guide shaft, 135-resistance wire, 136-sliding ring, 137-conductive sliding sheet, 138-shape memory alloy spring, 14-sealing strip, 15-guide rod and 16-bearing end cover.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Example (b): referring to fig. 1 to 6, a temperature-controlled round wedge magnetorheological fluid clutch comprises a driving shaft 1, a clutch shell, a driven shaft 3, an excitation coil 4 and magnetorheological fluid 5. The clutch shell comprises a clutch left end cover 201, a shell 202 and a clutch right end cover 203 which are sequentially connected, the shell 202 and the isolation baffle 7 are made of soft magnetic materials, and the left end cover and the right end cover are made of non-magnetic materials, so that a magnetic line path of a magnetic field can be guaranteed. The driving shaft 1 is fixedly connected with a clutch left end cover 201, the left end of the driven shaft 3 penetrates through a clutch right end cover 203 and then extends into a clutch housing, the left end is connected with the clutch left end cover 201 and the clutch right end cover 203 through bearings, and the part of the driven shaft 3 located in the clutch housing is expanded to form a transmission section 204. Wherein, the inboard of left end cover and right-hand member lid is the plane to seted up the bearing groove at the middle part of left end cover, the dead eye has been seted up at the middle part of right-hand member lid, and overall structure is more reasonable like this, and the assembly of being more convenient for. A bearing end cover 16 is further sleeved on the driven shaft 3, and the bearing end cover 16 is fixedly connected with the right end cover, so that the sealing effect of the whole clutch is improved. The middle part of the outer side of the clutch shell is provided with a coil groove which is wound by one circle, the magnet exciting coil 4 is arranged in the coil groove, the outer side of the coil groove is provided with a sealing sleeve 6, the sealing sleeve 6 is sleeved on the clutch shell and is fixedly connected with the clutch shell, and the magnet exciting coil 4 is sealed in the coil groove.
A plurality of isolation baffles 7 are arranged around the transmission section 204 at the outer side of the transmission section, two sides of each isolation baffle 7 extend to be correspondingly attached to the left end cover 201 and the right end cover 203 of the clutch, and the isolation baffles 7 are made of elastic metal or plastic. One end corresponding to each isolation baffle 7 is fixedly connected with the transmission end to form a fixed end, and the other end forms a free end, wherein the free end (clockwise or anticlockwise) of each isolation baffle 7 extends above the fixed end of the adjacent isolation baffle 7. A first return spring 8 is respectively arranged at the outer side of each isolation baffle 7 and close to the free end; the inner wall of the shell 202 is provided with first spring grooves corresponding to the first return springs 8, two ends of each first return spring 8 are fixedly connected with the groove bottom of the corresponding first spring groove and the corresponding isolation baffle 7, and the free end and the fixed end of each adjacent isolation baffle 7 are tightly attached together under the action of the corresponding first return spring 8. The magnetorheological fluid 5 is filled in the gap between the isolation baffle 7 and the inner wall of the shell 202. The shell 202 is also provided with a liquid injection hole which is communicated with a gap between the isolation baffle 7 and the inner wall of the shell 202, and a liquid injection screw plug is arranged in the liquid injection hole in a matching way; thereby facilitating the filling of the magnetorheological fluid 5. In one embodiment, the isolation baffles 7 are four and evenly distributed around the transmission section 204, and the centrifugal plates 9 are correspondingly four and distributed in a cross shape, so that the working stability of the whole clutch can be improved.
The inner sides of the isolation baffles 7 are respectively provided with a centrifugal plate 9, the centrifugal plate 9 is close to the free end of the isolation baffle 7, the length direction of the centrifugal plate is consistent with the axial direction of the transmission section 204, the width direction of the centrifugal plate is consistent with the radial direction of the transmission section 204, and the two ends of the centrifugal plate 9 extend to be correspondingly attached to the left end cover 201 and the right end cover 203 of the clutch. The transmission section 204 is provided with an accommodating groove corresponding to each centrifugal plate 9, the centrifugal plates 9 are positioned in the accommodating groove, a second spring groove is further arranged in the middle of the bottom of the accommodating groove, a second return spring 10 is arranged in the second spring groove, two ends of the second return spring 10 are respectively fixedly connected with the centrifugal plates 9 and the bottom of the accommodating groove, the centrifugal plates 9 are in a contraction state under the action of the first return spring 8, and the outer sides of the centrifugal plates are protruded out of the transmission section 204 and tightly attached to the isolation baffle 7.
In specific implementation, a sealing strip 14 is further arranged between the outer side of the centrifugal plate 9 and the inner side of the isolation baffle 7, and the sealing strip 14 is fixedly connected with the centrifugal plate 9; thus, the sealing effect between the centrifugal plate 9 and the isolation baffle 7 can be effectively improved. The bottom of the accommodating groove is further provided with two guide grooves, the guide grooves are arranged along the radial direction of the transmission section 204, and the two guide grooves are distributed on two sides of the second spring groove. And a guide rod 15 is respectively arranged on the inner side of the centrifugal plate 9 corresponding to the two guide grooves, one end of the guide rod 15 is fixedly connected with the centrifugal plate 9, and the other end of the guide rod 15 extends into the guide grooves and is in clearance fit with the groove walls of the guide grooves. Like this, can effectively improve centrifugal plate 9 and remove the stability of in-process, avoid the centrifugal baffle to produce the circumstances such as slope, upset.
Each isolation baffle 7 is also provided with a filtering hole, the filtering hole is positioned between the fixed end of the isolation baffle 7 and the centrifugal plate 9, a filtering membrane 11 is arranged in the filtering hole, and the basic liquid of the magnetorheological fluid 5 can be separated from the magnetic particles through the filtering membrane 11. When the filter is specifically implemented, the filter hole is of a step type, and the filter membrane 11 is installed in the large-diameter section of the filter hole and fixedly connected with the section of the small-diameter section of the filter hole, and shields the small-diameter section of the filter hole.
Two electric brush slip rings 12 are sleeved on the driving shaft 1, one end of the excitation coil 4 is connected with one of the electric brush slip rings 12 after passing through the shape memory alloy temperature control switch 13, and the other end is directly connected with the other electric brush slip ring 12. In one embodiment, the shape memory alloy temperature controlled switch 13 includes a switch left end cap 131, a switch outer cylinder 132, a switch right end cap 133, a guide shaft 134, a resistance wire 135, a slip ring 136, a conductive slide 137, and a shape memory alloy spring 138. The switch left end cover 131, the switch outer cylinder 132 and the switch right end cover 133 are made of insulating materials and are sequentially connected together, the guide shaft is arranged in the switch outer cylinder 132 along the axial direction of the switch outer cylinder 132, and two ends of the guide shaft are respectively connected with the switch left end cover 131 and the switch right end cover 133. The resistance wire 135 is wound to form a tubular structure, extends into the switch outer cylinder 132 from the left end of the switch outer cylinder 132, is embedded in the side wall of the switch outer cylinder 132, and has an inner wall flush with the inner wall of the switch outer cylinder 132; in specific implementation, the inner hole of the switch outer cylinder 132 is in a step shape, and the diameter of a section of the switch outer cylinder close to the switch left end cover 131 is larger than that of a section close to the right end cover; the resistance wire 135 is installed in the large diameter section of the switch outer cylinder 132. The slip ring 136 is sleeved on the guide shaft 134 and is connected with the guide shaft 134 in a sliding fit manner, a gap is formed between the outer side of the slip ring 136 and the switch outer cylinder 132, the conductive slip sheet 137 is installed on the slip ring 136, the conductive slip sheet 137 is made of an elastic material, and part of the conductive slip sheet 137 protrudes out of the slip ring 136 and is tightly attached to the switch outer cylinder 132. The shape memory alloy spring 138 is positioned between the conductive sliding piece 137 and the switch right end cover 133, is sleeved on the guide shaft 134, has two ends respectively and fixedly connected with the conductive sliding piece 137 and the switch right end cover 133, and is provided with a vent hole on the switch outer cylinder 132 corresponding to the position of the shape memory alloy spring 138; so that ambient temperature can quickly act on the shape memory alloy spring 138. An input terminal and an output terminal are respectively arranged on the left end cover and the right end cover, the input terminal is connected with the conductive sliding sheet 137 through a conducting wire, and the output terminal is connected with one end of the resistance wire 135 close to the switch left end cover 131. The length of the wire is greater than or equal to the length of the switch outer cylinder 132, or the wire is guided elastically, and the stretching length of the wire is greater than or equal to the length of the switch outer cylinder 132. In the initial state, a distance is reserved between the slip ring 136 and the resistance wire 135, when the temperature rises, the shape memory alloy spring 138 extends to push the slip ring 136 to move, and when the conductive slide piece 137 is in contact with the resistance wire 135, the power can be switched on; when the shape memory alloy spring 138 continues to extend, the length of the resistance wire 135 that can be connected to the circuit is reduced, thereby increasing the current applied to the excitation coil 4. During assembly, the shape memory alloy temperature control switch 13 is fixedly connected with the clutch left end cover 201 through the switch left end cover 131 and the switch right end cover 133 in a welding mode and the like. The input terminal is connected to one end of the field coil 4, and the output terminal is connected to the corresponding brush slip ring 12. In specific implementation, the two conductive sliding pieces 137 are symmetrically distributed on two sides of the sliding ring 136; one end of the conductive sliding piece 137 is fixedly connected with the sliding ring 136, the other end of the conductive sliding piece is tightly attached to the inner wall of the switch outer cylinder 132, and the fixed ends of the two conductive sliding pieces 137 are connected together; in this way, the stability of the contact of the conductive slider 137 with the resistance wire 135 can be ensured.
In the working process:
1. in the initial state, when the environmental temperature is lower (less than 50 ℃), the shape memory alloy temperature control switch 13 is opened, the magnet exciting coil 4 is not electrified, and when the driving shaft 1 rotates, the driven shaft 3 cannot be driven to rotate by the torque transmitted by the viscous shear stress of the magnetorheological fluid 5 under the zero magnetic field.
2. When the environment temperature reaches a certain temperature (usually 50 degrees), and the working environment temperature of the clutch reaches 70 degrees, the shape memory alloy temperature control switch 13 is closed, so that the excitation coil 4 is electrified and generates a magnetic field, the magnetic field generated by the excitation coil 4 acts on the magnetorheological fluid 5, and when the magnetorheological fluid 5 is solidified, the driving shaft 1 drives the driven shaft 3 (the isolation baffle 7) to rotate through the magnetorheological fluid 5.
With the further increase of the environmental temperature, when the environmental temperature is higher than a certain temperature (usually 70 °), the shape memory alloy spring 138 in the shape memory alloy temperature controlled switch 13 further extends, so that the internal resistance of the shape memory alloy temperature controlled switch 13 is reduced, the current passing through the excitation coil 4 is increased, the magnetic field strength of the working area of the magnetorheological fluid 5 is increased, the compensation of the performance loss of the magnetorheological fluid 5 at a high temperature is realized, and the transmission efficiency of the clutch at the high temperature is improved.
Meanwhile, the centrifugal plate 9 on the driving shaft 1 (the transmission section 204) pushes the isolation baffle 7 under the action of centrifugal force, so that a magnetorheological fluid working gap formed between the isolation baffle 7 and the shell 202 is in a wedge shape; when the driving shaft 1 and the driven shaft 3 rotate relatively, the magnetorheological fluid 5 in the wedge-shaped gap is squeezed by the wedge to generate a squeezing strengthening effect, and the squeezing strengthening effect of the magnetorheological fluid 5 is strengthened along with the increase of the magnetic field and the rotating speed, so that the transmission power of the device is improved. In addition, in the process of pushing the isolation baffle 7 by the centrifugal plate 9, the base liquid in the magnetorheological fluid 5 enters a sealed space among the centrifugal plate 9, the isolation baffle 7 and the transmission section 204 through the filtering membrane 11 on the isolation baffle 7, so that the volume fraction of the magnetic particles in the magnetorheological fluid 5 is improved, the shear yield stress of the magnetorheological fluid 5 is obviously improved, the maximum torque value which can be transmitted by the clutch is greatly improved, and the compensation of the performance loss of the magnetorheological fluid 5 at high temperature can be realized under the same high-temperature working condition, so that the stability of torque transmission is ensured.
3. When the temperature is further increased to reduce the transfer performance of the magnetorheological fluid 5, the shape memory alloy temperature control switch 13 further increases the current of the excitation coil 4 under the action of the thermal effect to increase the magnetic field strength of the working area of the magnetorheological fluid 5, so that the stability of the transfer performance of the device under the high-temperature condition is ensured, and the transfer performance of the device is more reliable.
4. Along with the reduction of the environmental temperature, the current of the magnet exciting coil 4 is reduced by the shape memory alloy temperature control switch 13, the torque transmitted by the magnetorheological fluid 5 is reduced, the rotating speed of the driven shaft 3 is reduced, the centrifugal plate 9 returns to the original position under the action of the second return spring 10, the basic liquid in the sealed space formed by the isolation baffle 7, the driven shaft 3 and the centrifugal plate 9 returns to the working gap of the magnetorheological fluid again through the filter membrane 11, the volume fraction of the magnetic particles in the working gap is reduced, the yield stress is weakened, the transmission power is reduced, and the isolation baffle 7 can return to the original position under the action of the second return spring 10.
When the environmental temperature continues to decrease (less than 50 ℃), the shape memory alloy temperature control switch 13 is switched off, no current exists in the magnet exciting coil 4, the clutch is disengaged, and no torque is transmitted any more.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (7)
1. A temperature control round wedge-shaped magnetorheological fluid clutch comprises a driving shaft, a clutch shell, a driven shaft, an excitation coil and magnetorheological fluid; the clutch shell comprises a clutch left end cover, a shell and a clutch right end cover which are sequentially connected, the driving shaft is fixedly connected with the clutch left end cover, the left end of the driven shaft penetrates through the clutch right end cover and then extends into the clutch shell, the left end of the driven shaft is connected with the clutch left end cover and the clutch right end cover through bearings, and the part of the driven shaft, which is positioned in the clutch shell, is expanded to form a transmission section; the middle part of the outer side of the clutch shell is provided with a coil groove which is wound by one circle, the excitation coil is arranged in the coil groove, the outer side of the coil groove is provided with a sealing sleeve, the sealing sleeve is sleeved on the clutch shell and is fixedly connected with the clutch shell, and the excitation coil is sealed in the coil groove; the method is characterized in that:
a plurality of isolation baffles are arranged around the transmission section at the outer side of the transmission section, and two sides of each isolation baffle extend to be correspondingly attached to the left end cover and the right end cover of the clutch; one end corresponding to each isolation baffle is fixedly connected with the transmission end to form a fixed end, and the other end forms a free end, wherein the free end of each isolation baffle extends above the fixed end of the adjacent isolation baffle; the outer side of each isolation baffle is respectively provided with a first return spring at a position close to the free end, the inner wall of the shell is respectively provided with a first spring groove corresponding to each first return spring, two ends of each first return spring are respectively fixedly connected with the groove bottom of each first spring groove and the isolation baffle, and the free end and the fixed end of each adjacent isolation baffle are tightly attached together under the action of the first return spring; the magnetorheological fluid is filled in a gap between the isolation baffle and the inner wall of the shell; the shell and the isolation baffle are made of soft magnetic materials, and the left end cover and the right end cover are made of non-magnetic materials;
the inner sides of the isolation baffles are respectively provided with a centrifugal plate, the centrifugal plate is close to the free end of the isolation baffle, the length direction of the centrifugal plate is consistent with the axial direction of the transmission section, the width direction of the centrifugal plate is consistent with the radial direction of the transmission section, and the two ends of the centrifugal plate extend to be correspondingly attached to the left end cover and the right end cover of the clutch; the transmission section is provided with a containing groove corresponding to each centrifugal plate, the centrifugal plates are positioned in the containing groove, the middle part of the bottom of the containing groove is also provided with a second spring groove, a second reset spring is arranged in the second spring groove, two ends of the second reset spring are respectively fixedly connected with the centrifugal plates and the bottom of the containing groove, and under the action of the first reset spring, the centrifugal plates are in a contraction state, and the outer sides of the centrifugal plates are protruded out of the transmission section and tightly attached to the isolation baffle; each isolation baffle is also provided with a filtering hole, the filtering hole is positioned between the fixed end of the isolation baffle and the centrifugal plate, a filtering membrane is arranged in the filtering hole, and the basic liquid of the magnetorheological fluid can be separated from the magnetic particles through the filtering membrane;
and two electric brush slip rings are further sleeved on the driving shaft, one end of the excitation coil is connected with one of the electric brush slip rings after passing through the shape memory alloy temperature control switch, and the other end of the excitation coil is directly connected with the other electric brush slip ring.
2. The temperature-controlled round wedge magnetorheological fluid clutch of claim 1, wherein: and a sealing strip is also arranged between the outer side of the centrifugal plate and the inner side of the isolation baffle and is fixedly connected with the centrifugal plate.
3. The temperature-controlled round wedge magnetorheological fluid clutch of claim 1, wherein: the bottom of the accommodating groove is also provided with two guide grooves which are distributed on two sides of the second spring groove; and a guide rod is respectively arranged on the inner side of the centrifugal plate corresponding to the two guide grooves, one end of the guide rod is fixedly connected with the centrifugal plate, and the other end of the guide rod extends into the guide grooves and is in clearance fit with the groove walls of the guide grooves.
4. The temperature-controlled round wedge magnetorheological fluid clutch of claim 1, wherein: the shell is also provided with a liquid injection hole, and a liquid injection screw plug is arranged in the liquid injection hole in a matching way.
5. The temperature-controlled round wedge magnetorheological fluid clutch of claim 1, wherein: and the driven shaft is also sleeved with a bearing end cover which is fixedly connected with the right end cover.
6. The temperature-controlled round wedge magnetorheological fluid clutch of claim 1, wherein: the shape memory alloy temperature control switch comprises a switch left end cover, a switch outer barrel, a switch right end cover, a guide shaft, a resistance wire, a slip ring, a conductive slip sheet and a shape memory alloy spring; the switch left end cover, the switch outer barrel and the switch right end cover are all made of insulating materials and are sequentially connected together, the guide shaft is arranged in the switch outer barrel along the axial direction of the switch outer barrel, and two ends of the guide shaft are respectively connected with the switch left end cover and the switch right end cover; the resistance wire is of a cylindrical structure, extends into the switch outer cylinder from the left end of the switch outer cylinder, is embedded in the side wall of the switch outer cylinder, and has an inner wall flush with the inner wall of the switch outer cylinder; the sliding ring is sleeved on the guide shaft and is connected with the guide shaft in a sliding fit manner, a gap is formed between the outer side of the sliding ring and the outer cylinder of the switch, the conductive sliding sheet is arranged on the sliding ring and is made of an elastic material, and part of the conductive sliding sheet protrudes out of the sliding ring and is tightly attached to the outer cylinder of the switch; the shape memory alloy spring is positioned between the conductive sliding piece and the switch right end cover and is sleeved on the guide shaft, two ends of the shape memory alloy spring are respectively and fixedly connected with the conductive sliding piece and the switch right end cover, and a vent hole is formed in the switch outer cylinder corresponding to the position of the shape memory alloy spring; an input terminal and an output terminal are respectively arranged on the left end cover and the right end cover, the input terminal is connected with the conductive sliding sheet through a lead, and the output terminal is connected with one end of the resistance wire close to the left end cover of the switch; the input terminal is connected with one end of the excitation coil, and the output terminal is connected with the corresponding brush slip ring.
7. The temperature-controlled round wedge magnetorheological fluid clutch of claim 6, wherein: the two conductive sliding sheets are symmetrically distributed on two sides of the sliding ring; one end of the conductive sliding sheet is fixedly connected with the sliding ring, the other end of the conductive sliding sheet is tightly attached to the inner wall of the switch outer cylinder, and the fixed ends of the two conductive sliding sheets are connected together.
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| CN201911244221.2A CN110848283B (en) | 2019-12-06 | 2019-12-06 | Temperature control round wedge-shaped magnetorheological fluid clutch |
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| CN201911244221.2A CN110848283B (en) | 2019-12-06 | 2019-12-06 | Temperature control round wedge-shaped magnetorheological fluid clutch |
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| CN110848283B true CN110848283B (en) | 2021-01-05 |
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| CN112503113B (en) * | 2020-12-15 | 2021-08-06 | 吉林大学 | Self-adjusting rectangular limiting clutch based on magnetorheological fluid |
| CN114033815B (en) * | 2021-11-12 | 2023-08-22 | 重庆理工大学 | Multi-disc circular arc type MRF and SMA spring friction compound transmission device |
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