CN113431850B - Electromagnetic extrusion magnetorheological and shape memory alloy friction composite brake - Google Patents
Electromagnetic extrusion magnetorheological and shape memory alloy friction composite brake Download PDFInfo
- Publication number
- CN113431850B CN113431850B CN202110837125.XA CN202110837125A CN113431850B CN 113431850 B CN113431850 B CN 113431850B CN 202110837125 A CN202110837125 A CN 202110837125A CN 113431850 B CN113431850 B CN 113431850B
- Authority
- CN
- China
- Prior art keywords
- brake
- disc
- shape memory
- memory alloy
- guide rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F16D63/00—Brakes not otherwise provided for; Brakes combining more than one of the types of groups F16D49/00 - F16D61/00
-
- 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
- F16D51/00—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like
- F16D51/10—Brakes with outwardly-movable braking members co-operating with the inner surface of a drum or the like shaped as exclusively radially-movable brake-shoes
-
- 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
- F16D57/00—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders
- F16D57/002—Liquid-resistance brakes; Brakes using the internal friction of fluids or fluid-like media, e.g. powders comprising a medium with electrically or magnetically controlled internal friction, e.g. electrorheological fluid, magnetic powder
-
- 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
- F16D65/00—Parts or details
- F16D65/02—Braking members; Mounting thereof
- F16D65/04—Bands, shoes or pads; Pivots or supporting members therefor
- F16D65/08—Bands, shoes or pads; Pivots or supporting members therefor for internally-engaging brakes
-
- 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
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
- F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
-
- 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
- F16D2121/00—Type of actuator operation force
- F16D2121/18—Electric or magnetic
- F16D2121/32—Electric or magnetic using shape memory or other thermo-mechanical elements
Abstract
The invention relates to an electromagnetic extrusion magneto-rheological and shape memory alloy friction composite brake, which comprises a brake shaft, a brake shell and a brake base, wherein a brake disc is also arranged in the brake shell; an armature plate is respectively arranged between the brake disc and the left shell and between the brake disc and the right shell, an extrusion plate is arranged between the armature plate and the brake disc, and magnetorheological fluid is filled between the extrusion plate and the brake disc; the brake disc is provided with a plurality of accommodating grooves, hollow liquid guide rods and shape memory alloy springs are arranged in the accommodating grooves, and the outer ends of the accommodating grooves are provided with a friction block; a liquid guide hole is arranged between the coil groove and the accommodating groove, a plurality of through holes are formed in the side wall of the hollow liquid guide rod, and heat conduction liquid is filled in the liquid guide hole, the accommodating groove and the hollow liquid guide rod. The invention can effectively improve the braking torque of the brake, ensure the braking stability and improve the braking effect.
Description
Technical Field
The invention relates to the technical field of brakes, in particular to an electromagnetic extrusion magnetorheological and shape memory alloy friction composite brake.
Background
The magnetic rheological liquid is a magnetic intelligent material, mainly comprises magnetic particles and base liquid (usually silicon oil), 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 changes by several orders of magnitude, and the property of the Bingham plastic fluid is shown; the whole change process is rapid and reversible, and the operation is simple and convenient.
Based on the properties of the magnetorheological fluid, the magnetorheological fluid has wide application prospect in the field of clutches and brakes; for example, the "electrothermal magnetic shape memory alloy and magnetorheological fluid composite centrifugal clutch" disclosed in chinese patent CN104895956A, utilizes the dual force transmission characteristics of the magnetorheological fluid and the shape memory alloy, and the generated centrifugal force to further increase the output power, so that the transmission efficiency of the clutch can be improved by a small current. However, when the magnetorheological fluid reaches magnetic saturation, the generated braking torque cannot be increased continuously; and in the long-term working process, when the performance of the magnetorheological fluid is reduced due to temperature rise, the generated braking torque is also reduced, so that the performance of the transmission device is unstable at high temperature. For example, "a radial extrusion type magnetorheological fluid brake" disclosed in CN103089863A, the brake has a simpler structure and can provide a larger braking torque; but the stability and reliability of the transmission torque are poor under the high-temperature environment.
In summary, researchers have developed extensive application of magnetorheological fluid in braking, but the magnetorheological fluid also has the following defects in braking: the brake torque is smaller based on the magnetorheological fluid brake; the performance of the magnetorheological fluid is easy to be reduced or even fail in a high-temperature environment. Therefore, how to better apply the shape memory alloy and the magnetorheological fluid to the brake; reasonably utilizing the extrusion strengthening effect of the magnetorheological fluid; the problems that the stability of the brake is poor and the braking effect is poor in a high-temperature environment are not considered in the magnetorheological brake, and the high-performance operation of the magnetorheological brake is guaranteed, so that the technical problems which are continuously solved by technical personnel in the field are solved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to solve the problems of poor braking effect, large high-temperature influence, high volatility and poor stability of the existing magnetorheological fluid brake, and provides an electromagnetic extrusion magnetorheological and shape memory alloy friction composite brake which can effectively improve the braking torque of the brake, ensure the braking stability and improve the braking effect.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows: an electromagnetically extruded magnetorheological and shape memory alloy friction composite brake comprises a brake shaft, a brake shell and a brake base, wherein the brake shell comprises a left shell, an outer cylinder and a right shell which are sequentially connected, and the brake base is fixedly connected with the outer cylinder; the left end of the brake shaft penetrates through the right shell and then extends into the brake shell, and is rotationally connected with the left shell and the right shell through a bearing; a coil groove is coaxially arranged on each of two sides of the brake disc, and an excitation coil is wound in the coil groove; the method is characterized in that: an armature disc is arranged between the brake disc and the left and right shells respectively, the armature disc is sleeved on the brake shaft and is connected with the brake shaft in a sliding fit manner, a squeezing disc is arranged between the armature disc and the brake disc, the squeezing disc is tightly attached to the armature disc, a gap is formed between the squeezing disc and the brake disc, and magnetorheological fluid is filled in the gap between the squeezing disc and the brake disc; a plurality of threaded guide rods are further arranged on the left shell and the right shell along the axial direction of the brake shaft, the outer ends of the threaded guide rods are correspondingly in threaded connection with the left shell and the right shell, the inner ends of the threaded guide rods sequentially penetrate through the armature disc and the extrusion disc, and the armature disc and the extrusion disc are connected with the threaded guide rods in a sliding fit manner;
a plurality of accommodating grooves are formed on the circumferential surface of the brake disc around one circumference of the brake disc, and the axial direction of each accommodating groove is consistent with the radial direction of the brake disc; a hollow liquid guide rod and a shape memory alloy spring are arranged in the accommodating groove, the inner end of the hollow liquid guide rod is fixedly connected with the bottom of the accommodating groove, the outer end of the hollow liquid guide rod extends to the outer end close to the accommodating groove, and the outer end of the accommodating groove is provided with a friction block which is sleeved on the hollow liquid guide rod and is connected with the side wall of the accommodating groove in a sliding fit manner; the shape memory alloy spring is sleeved on the hollow liquid guide rod, the inner end of the shape memory alloy spring is connected with the bottom of the accommodating groove, the outer end of the shape memory alloy spring is connected with the friction block, and in an initial state, under the action of the shape memory alloy spring, a gap is formed between the friction block and the outer cylinder;
a liquid guide hole is arranged between the coil groove and the accommodating groove, a plurality of through holes are formed in the side wall of the hollow liquid guide rod, and heat conduction liquid is filled in the liquid guide hole, the accommodating groove and the hollow liquid guide rod.
Furthermore, a guide sleeve is arranged between the friction block and the hollow heat-conducting guide rod, the inner end of the guide sleeve is sleeved on the hollow heat-conducting guide rod and is connected with the hollow heat-conducting guide rod and the side wall of the accommodating groove in a sliding fit manner, and the outer end of the shape memory alloy spring is connected with the guide sleeve; the friction block is connected with the outer end of the guide sleeve, a blind hole is formed in the inner side of the friction block and corresponds to the position of the hollow liquid guide rod, a heat conduction film is arranged between the blind hole and the guide sleeve, and heat conduction liquid is filled in the blind hole and the guide sleeve.
Furthermore, a plurality of arc-shaped bulges are arranged on the outer side of the friction block along the circumferential direction of the friction block, so that the outer side surface of the radial section of the friction block is wavy; the inner side of the outer cylinder is provided with an arc-shaped groove which is wound around the arc-shaped bulges in a circle corresponding to the arc-shaped bulges.
Furthermore, a magnetic isolation film is plated on one side of the extrusion disc, which is close to the side passing through the armature disc.
Furthermore, the inner side of the armature plate is correspondingly provided with a pressing plate which is provided with a groove, and the pressing plate is embedded in the groove and fastened with the armature plate.
Furthermore, a heat insulation sleeve is arranged on the outer side of the excitation coil, and the excitation coil is sealed in the coil groove by the heat insulation sleeve.
Furthermore, at least one threaded hollow guide rod is respectively arranged on the left shell and the right shell, the outer end of the threaded hollow guide rod is correspondingly connected with the left shell and the right shell in a threaded manner, the inner end of the threaded hollow guide rod sequentially penetrates through the armature disc and the extrusion disc, the armature disc and the extrusion disc are connected with the threaded hollow guide rod in a sliding fit manner, and a liquid injection screw plug is arranged at the outer end of the threaded hollow guide rod.
Furthermore, an electric brush slip ring is sleeved on the brake shaft, wire holes are formed in the brake shaft and the brake disc, and two ends of the excitation coil are connected with the electric brush slip ring after passing through the wire holes.
Compared with the prior art, the invention has the following advantages:
1. when the magnet exciting coil is electrified, a magnetic field generated by the magnet exciting coil acts on the armature disc, the armature disc is attracted through electromagnetic force, the armature disc pushes the extrusion disc inwards along the axial direction of the brake shaft, the extrusion disc extrudes the magnetorheological fluid, and the extrusion strengthening effect is generated on the chained magnetorheological fluid through extrusion, so that the shearing yield stress of the magnetorheological fluid is multiplied, the extrusion strengthening effect of the magnetorheological fluid is strengthened along with the increase of the magnetic field, and the braking range and the braking performance of the brake are further improved.
2. In the long-time load working process of the brake, most of Joule generated by the exciting coil is restrained in the exciting coil groove by the heat insulation sleeve around the coil, and heat is conducted to the accommodating groove through the heat conduction liquid on the inner side of the coil groove; in the heat gathering process in the accommodating hole, the temperature of the shape memory alloy spring rises, the top end of the shape memory alloy spring pushes the friction block to extrude with the inner wall of the outer cylinder to generate friction torque, the heat energy of the coil is converted into near mechanical energy required by braking through the shape memory alloy, the performance attenuation of the magnetorheological fluid caused by overhigh temperature is reduced, the braking performance of the brake under the high-temperature working condition is enhanced, the heat energy is fully converted and utilized, and the energy waste is reduced.
3. The friction contact surface at the top of the friction block is wave-shaped, so that the contact area is increased, and the friction torque is enhanced; through the blind hole of cavity drain guide bar hole and clutch blocks inboard, the heat that produces among the clutch blocks friction process also can be through heat conduction liquid conduction to the holding in, has both reduced the temperature rise of clutch blocks contact surface, can promote the temperature of shape memory alloy spring again to further improve the performance of friction braking.
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.
In the figure: the brake comprises a brake shaft 1, a brake base 2, a brake base 3, a left shell, an outer cylinder 4, a right shell 5, a brake disc 6, a magnet exciting coil 7, an armature disc 8, a squeezing disc 9, magnetorheological fluid 10, a threaded guide rod 11, a hollow liquid guide rod 12, a shape memory alloy spring 13, a friction block 14, heat conducting liquid 15, a guide sleeve 16, a heat conducting film 17, a heat insulating sleeve 18, a threaded hollow guide rod 19 and a liquid injection screw plug 20.
Detailed Description
The invention will be further explained with reference to the drawings and the embodiments.
Example (b): referring to fig. 1 and 2, an electromagnetic extrusion magnetorheological and shape memory alloy friction composite brake comprises a brake shaft 1, a brake housing and a brake base 2. The brake shell comprises a left shell body 3, an outer cylinder 4 and a right shell body 5 which are connected in sequence, and the brake base 2 is fixedly connected with the outer cylinder 4. The left end of the brake shaft 1 penetrates through the right shell 5 and then extends into the brake shell, and is rotatably connected with the left shell 3 and the right shell 5 through bearings, wherein the bearings are provided with oil seal bearings, and the sealing lip edges of the bearings are tightly attached to the brake disc 6; thereby effectively sealing the automatic housing. A brake disc 6 is also arranged in the brake shell, the brake disc 6 is sleeved on the brake shaft 1 and is fixed with the brake shaft 1 into a whole, and gaps are formed among the brake disc 6, the left shell 3, the outer cylinder 4 and the right shell 5; in actual manufacturing, the brake disc 6 is integrally formed with the brake shaft 1. And a coil groove is coaxially arranged on each of two sides of the brake disc 6, and an excitation coil 7 is wound in the coil groove. A heat insulation sleeve 18 is arranged on the outer side of the excitation coil 7, and the excitation coil 7 is sealed in the coil groove by the heat insulation sleeve 18; wherein, the section of the heat insulation sleeve 18 is U-shaped, and the opening of the heat insulation sleeve faces the bottom direction of the coil slot; therefore, heat generated by the magnet exciting coil 7 can be effectively prevented from being transferred to the magnetorheological fluid 10, the magnetorheological fluid 10 is prevented from being heated too fast, and the stability of the working state of the magnetorheological fluid 10 can be effectively improved. A transparent cover is further arranged on the right side of the right shell 5, the transparent cover is sleeved on the brake shaft 1 and is fixedly connected with the right end cover, and a felt ring is further arranged between the transparent cover and the brake shaft 1.
An armature disc 8 is arranged between the brake disc 6 and the left shell 3 and the right shell 5 respectively, and the armature disc 8 is sleeved on the brake shaft 1 and connected with the brake shaft 1 in a sliding fit manner. A squeezing disc 9 is arranged between the armature disc 8 and the brake disc 6, the squeezing disc 9 is tightly attached to the armature disc 8, a gap is arranged between the squeezing disc 9 and the brake disc 6, and a magnetic isolation film is plated on one side of the squeezing disc 9, which is close to the armature disc 8; the magnetic induction line is prevented from acting on the armature plate 8 after passing through the extrusion plate 9 along the axial direction, so that the armature plate 8 is ensured to be only subjected to the axial suction force. When the method is implemented, the inner side of the armature plate 8 is correspondingly provided with a pressing plate 9 which is provided with a groove, and the pressing plate 9 is embedded in the groove and fastened with the armature plate 8; therefore, the consistency of the movement of the pressing disc 9 and the armature disc 8 can be ensured, and the magnetorheological fluid 10 can be better pressed. The gap between the pressing disc 9 and the brake disc 6 is filled with magnetorheological fluid 10. The left shell 3 and the right shell 5 are respectively provided with at least one threaded hollow guide rod 19, the outer end of each threaded hollow guide rod 19 is correspondingly in threaded connection with the left shell 3 and the right shell 5, the inner end of each threaded hollow guide rod sequentially penetrates through the armature disc 8 and the extrusion disc 9, the armature disc 8 and the extrusion disc 9 are in sliding fit connection with the threaded hollow guide rods 19, and the outer ends of the threaded hollow guide rods 19 are provided with liquid injection screw plugs 20; thereby facilitating the filling of the magnetorheological fluid 10. During processing, a sealing ring is arranged between the brake disc 6 and the left shell 3 and the right shell 5 respectively, and the sealing ring is wound on the outer side of the armature disc 8, so that leakage of magnetorheological fluid 10 is avoided. A plurality of threaded guide rods 11 are further arranged on the left shell 3 and the right shell 5 along the axial direction of the brake shaft 1, the outer ends of the threaded guide rods 11 are correspondingly in threaded connection with the left shell 3 and the right shell 5, the inner ends of the threaded guide rods 11 sequentially penetrate through an armature disc 8 and an extrusion disc 9, and the armature disc 8 and the extrusion disc 9 are connected with the threaded guide rods 11 in a sliding fit manner; in this way, it is possible to ensure that the braking torque developed by the brake base 2 is transmitted to the brake shaft 1.
On the circumferential surface of the brake disk 6, a plurality of receiving grooves are formed around the circumferential surface, the axial direction of the receiving grooves is the same as the radial direction of the brake disk 6, and the inner ends of the receiving grooves extend to the inner side of the excitation coil 7. The inside of the hollow liquid guide rod 12 is fixedly connected with the bottom of the containing groove, the outside end of the hollow liquid guide rod 12 extends to the outside end close to the containing groove, the outside end of the containing groove is provided with a friction block 14, and the friction block 14 is sleeved on the hollow liquid guide rod 12 and is connected with the side wall of the containing groove in a sliding fit manner. The shape memory alloy spring 13 is sleeved on the hollow liquid guide rod 12, the inner end of the shape memory alloy spring is connected with the bottom of the accommodating groove, the outer end of the shape memory alloy spring is connected with the friction block 14, in an initial state, under the action of the shape memory alloy spring 13, a gap is formed between the friction block 14 and the outer cylinder 4, and after the shape memory alloy spring 13 extends, the friction block 14 can be pushed to move outwards and is pressed on the outer cylinder 4, so that friction is generated between the friction block 14 and the outer cylinder 4. The outer side surface of the axial section of the friction block 14 is arc-shaped, and the radian of the outer cylinder 4 is consistent with that of the friction block, so that the friction block 14 can be better attached to the outer cylinder 4, and the contact area is increased. A plurality of arc-shaped bulges are arranged on the outer side of the friction block 14 along the circumferential direction of the friction block, so that the outer side surface of the radial section of the friction block 14 is wavy; an arc-shaped groove which is wound around the arc-shaped bulges is arranged on the inner side of the outer cylinder 4 corresponding to the arc-shaped bulges; thus, the contact area can be further increased, thereby making the frictional force larger and providing a larger frictional torque. A guide sleeve 16 is arranged between the friction block 14 and the hollow heat-conducting guide rod, and a sealing ring is arranged between the guide sleeve 16 and the side wall of the accommodating groove so as to prevent the heat-conducting liquid 15 from leaking. The inner end of the guide sleeve 16 is sleeved on the hollow heat-conducting guide rod and is connected with the hollow heat-conducting guide rod and the side wall of the accommodating groove in a sliding fit manner; the outer end of the shape memory alloy spring 13 is connected to the guide sleeve 16. The friction block 14 is connected with the outer end of the guide sleeve 16, a blind hole is arranged on the inner side of the friction block 14 and corresponds to the position of the hollow liquid guide rod 12, a heat conduction film 17 is arranged between the blind hole and the guide sleeve 16, and heat conduction liquid 15 is filled in the blind hole and the guide sleeve 16.
A liquid guide hole is arranged between the coil groove and the accommodating groove, a plurality of through holes are arranged on the side wall of the hollow liquid guide rod 12, and heat-conducting liquid 15 is filled in the liquid guide hole, the accommodating groove and the hollow liquid guide rod 12. In actual manufacturing, the heat conducting liquid 15 is made of silicone oil, so that the heat conducting effect is better, and the heat transfer speed is higher.
During assembly, an electric brush slip ring is sleeved on the brake shaft 1, wire holes are formed in the brake shaft 1 and the brake disc 6, and two ends of the magnet exciting coil 7 are connected with the electric brush slip ring after passing through the wire holes.
In the working process:
1. in an initial state, the brake shaft 1 is driven by a prime motor to rotate, when the excitation coil 7 is not electrified, magnetic particles in the magnetorheological fluid 10 are in a free state in the base fluid, obvious braking torque cannot be generated by means of viscous torque of the magnetorheological fluid 10 under a zero magnetic field, the temperature of the brake is lower than a certain temperature (such as 60 ℃), the shape memory alloy spring 13 does not generate extrusion force to push the friction block 14 to generate friction torque, and the brake does not generate a braking effect.
2. When the exciting coil 7 is electrified, the magnetic flux generated by the exciting coil 7 passes through the magnetorheological fluid 10, the magnetic particles in the magnetorheological fluid 10 are arranged into a chain-shaped structure along the direction of the magnetic flux, and an obvious braking effect can be generated by means of the torque transmitted by the shearing stress of the chain-shaped structure; and the magnetic field intensity is controlled by the current, the chaining degree of the magnetorheological fluid 10 is more obvious along with the increase of the magnetic field intensity, and when the magnetorheological fluid 10 reaches magnetic saturation, the braking torque which can be generated by the magnetorheological fluid 10 reaches the maximum value. Meanwhile, magnetic induction lines generated by the magnet exciting coils 7 on the two sides act on the armature plate 8 and generate electromagnetic force, the electromagnetic force enables the armature plate 8 to push the pressing plate 9 on the inner side to press the magnetorheological fluid 10, the magnetorheological fluid 10 generates a pressing strengthening effect after being pressed, the shearing yield stress of the magnetorheological fluid 10 is multiplied, and the braking torque of the brake is obviously increased.
3. In the process of continuous braking, the working temperature of the magnet exciting coil 7 gradually rises due to the electrothermal effect, but the outer sides of the magnet exciting coil 7 are respectively sleeved with the heat insulating sleeve 18, and the heat conduction of the coil to the magnetorheological fluid 10 can be obviously reduced through the heat insulating sleeve 18. Meanwhile, a plurality of liquid guide holes are formed in the circumferential direction of the coil groove and are communicated with the shape memory alloy containing holes, and heat generated by the excitation coil 7 can be conducted to the shape memory alloy spring 13 through silicon oil in the liquid guide holes because the heat insulation sleeve 18 is not arranged on the inner side of the coil groove. The heat of the exciting coil 7 is accumulated in the area of the shape memory alloy spring 13, when the temperature of the shape memory alloy spring 13 rises to a certain temperature (for example, 60 ℃), the shape memory alloy spring 13 generates the shape memory effect under the drive of the heat energy, the shape memory alloy spring 13 pushes the friction block 14 to move outwards, the friction block 14 and the inner wall of the outer cylinder 4 are rubbed to generate friction braking torque, so that the braking performance of the brake is further improved, meanwhile, along with the rise of the temperature of the shape memory alloy spring 13, the pushing force generated by the shape memory alloy spring 13 is larger, the friction torque generated by the friction block 14 is larger, and the friction braking torque reaches the maximum value when the shape memory alloy spring 13 reaches a certain temperature (for example, 100 ℃). In the process, through the friction block 14, the guide sleeve 16 and the silicon oil in the channel inside the hollow liquid guide rod 12, the heat generated by the friction between the friction block 14 and the inner wall of the outer cylinder 4 can be conducted to the shape memory alloy spring 13; therefore, the temperature rise of the friction contact surface of the friction block 14 and the inner wall of the outer cylinder 4 can be slowed down, and the stability of the friction torque generated by the shape memory alloy spring 13 is ensured.
4. When braking is finished, the magnetic flux of the exciting coil 7 is cut off, the armature plate 8 does not push the extrusion plate 9 to extrude the magnetorheological fluid 10 any more, magnetic particles in the magnetorheological fluid 10 are restored to a free state in the base fluid, and the magnetorheological fluid 10 does not generate braking torque any more; meanwhile, when the temperature of the shape memory alloy spring 13 is reduced to a certain temperature (such as 60 ℃), the friction block 14 is not pushed any more to generate braking torque, and the brake does not generate braking effect.
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 (8)
1. An electromagnetically extruded magnetorheological and shape memory alloy friction composite brake comprises a brake shaft, a brake shell and a brake base, wherein the brake shell comprises a left shell, an outer cylinder and a right shell which are sequentially connected, and the brake base is fixedly connected with the outer cylinder; the left end of the brake shaft penetrates through the right shell and then extends into the brake shell, and is rotationally connected with the left shell and the right shell through a bearing; a coil groove is coaxially arranged on each of two sides of the brake disc, and an excitation coil is wound in the coil groove; the method is characterized in that: an armature disc is arranged between the brake disc and the left and right shells respectively, the armature disc is sleeved on the brake shaft and is connected with the brake shaft in a sliding fit manner, a squeezing disc is arranged between the armature disc and the brake disc, the squeezing disc is tightly attached to the armature disc, a gap is formed between the squeezing disc and the brake disc, and magnetorheological fluid is filled in the gap between the squeezing disc and the brake disc; a plurality of threaded guide rods are further arranged on the left shell and the right shell along the axial direction of the brake shaft, the outer ends of the threaded guide rods are correspondingly in threaded connection with the left shell and the right shell, the inner ends of the threaded guide rods sequentially penetrate through the armature disc and the extrusion disc, and the armature disc and the extrusion disc are connected with the threaded guide rods in a sliding fit manner;
a plurality of accommodating grooves are formed on the circumferential surface of the brake disc around one circumference of the brake disc, and the axial direction of each accommodating groove is consistent with the radial direction of the brake disc; a hollow liquid guide rod and a shape memory alloy spring are arranged in the accommodating groove, the inner end of the hollow liquid guide rod is fixedly connected with the bottom of the accommodating groove, the outer end of the hollow liquid guide rod extends to the outer end close to the accommodating groove, and the outer end of the accommodating groove is provided with a friction block which is sleeved on the hollow liquid guide rod and is connected with the side wall of the accommodating groove in a sliding fit manner; the shape memory alloy spring is sleeved on the hollow liquid guide rod, the inner end of the shape memory alloy spring is connected with the bottom of the accommodating groove, the outer end of the shape memory alloy spring is connected with the friction block, and in an initial state, under the action of the shape memory alloy spring, a gap is formed between the friction block and the outer cylinder;
a liquid guide hole is arranged between the coil groove and the accommodating groove, a plurality of through holes are formed in the side wall of the hollow liquid guide rod, and heat conduction liquid is filled in the liquid guide hole, the accommodating groove and the hollow liquid guide rod.
2. The electromagnetic extrusion magnetorheological and shape memory alloy friction compound brake according to claim 1, wherein: a guide sleeve is arranged between the friction block and the hollow heat-conducting guide rod, the inner end of the guide sleeve is sleeved on the hollow heat-conducting guide rod and is connected with the hollow heat-conducting guide rod and the side wall of the accommodating groove in a sliding fit manner, and the outer end of the shape memory alloy spring is connected with the guide sleeve; the friction block is connected with the outer end of the guide sleeve, a blind hole is formed in the inner side of the friction block and corresponds to the position of the hollow liquid guide rod, a heat conduction film is arranged between the blind hole and the guide sleeve, and heat conduction liquid is filled in the blind hole and the guide sleeve.
3. The electromagnetic extrusion magnetorheological and shape memory alloy friction compound brake according to claim 1, wherein: a plurality of arc-shaped bulges are arranged on the outer side of the friction block along the circumferential direction of the friction block, so that the outer side surface of the radial section of the friction block is wavy; the inner side of the outer cylinder is provided with an arc-shaped groove which is wound around the arc-shaped bulges in a circle corresponding to the arc-shaped bulges.
4. The electromagnetic extrusion magnetorheological and shape memory alloy friction compound brake according to claim 1, wherein: one side of the extrusion disc close to the armature disc is plated with a magnetic isolation film.
5. The electromagnetic extrusion magnetorheological and shape memory alloy friction compound brake according to claim 1, wherein: the inner side of the armature plate is correspondingly provided with an extrusion plate which is provided with a groove, and the extrusion plate is embedded in the groove and fastened with the armature plate.
6. The electromagnetic extrusion magnetorheological and shape memory alloy friction compound brake according to claim 1, wherein: and a heat insulation sleeve is arranged on the outer side of the excitation coil and seals the excitation coil in the coil groove.
7. The electromagnetic extrusion magnetorheological and shape memory alloy friction compound brake according to claim 1, wherein: the left shell and the right shell are respectively provided with at least one threaded hollow guide rod, the outer end of each threaded hollow guide rod is correspondingly connected with the left shell and the right shell in a threaded manner, the inner end of each threaded hollow guide rod sequentially penetrates through the armature disc and the extrusion disc, the armature disc and the extrusion disc are connected with the threaded hollow guide rods in a sliding fit manner, and the outer end of each threaded hollow guide rod is provided with a liquid injection screw plug.
8. The electromagnetic extrusion magnetorheological and shape memory alloy friction compound brake according to claim 1, wherein: the brake shaft is sleeved with an electric brush slip ring, the brake shaft and the brake disc are provided with wire holes, and two ends of the excitation coil are connected with the electric brush slip ring after passing through the wire holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110837125.XA CN113431850B (en) | 2021-07-23 | 2021-07-23 | Electromagnetic extrusion magnetorheological and shape memory alloy friction composite brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110837125.XA CN113431850B (en) | 2021-07-23 | 2021-07-23 | Electromagnetic extrusion magnetorheological and shape memory alloy friction composite brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113431850A CN113431850A (en) | 2021-09-24 |
| CN113431850B true CN113431850B (en) | 2022-03-08 |
Family
ID=77761800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110837125.XA Active CN113431850B (en) | 2021-07-23 | 2021-07-23 | Electromagnetic extrusion magnetorheological and shape memory alloy friction composite brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113431850B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864374B (en) * | 2021-09-30 | 2023-08-18 | 重庆理工大学 | Shape memory alloy compacted sliding block and electromagnetic friction combined brake |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990047271A (en) * | 1997-12-03 | 1999-07-05 | 윤덕용 | Braking system for both load device using magnetorheological fluid |
| WO2004092606A2 (en) * | 2003-04-17 | 2004-10-28 | Victhom Human Bionics Inc. | High power/weight ratio braking device based on shape memory material technology |
| EP1767804A1 (en) * | 2005-09-27 | 2007-03-28 | C.R.F. Societa Consortile per Azioni | Disk-brake device with shape memory damping means |
| CN104895956A (en) * | 2015-06-15 | 2015-09-09 | 重庆理工大学 | Electro-thermo-magnetic shape memory alloy and magnetorheological fluid composite centrifugal clutch |
| DE102015205705A1 (en) * | 2015-03-30 | 2016-10-06 | Robert Bosch Gmbh | Actuator, method of operation |
| CN108087449A (en) * | 2017-12-01 | 2018-05-29 | 江苏华强自动化科技有限公司 | The soft starting device squeezed based on magnetorheological fluid and marmem |
| CN207470647U (en) * | 2017-10-27 | 2018-06-08 | 重庆理工大学 | A kind of marmem cooperates with cydariform formula magnetorheological fluid brake apparatus |
| CN109681545A (en) * | 2019-03-08 | 2019-04-26 | 重庆理工大学 | The magnetorheological fluid of marmem driving combines transmission device with electromagnet-friction |
| CN112460165A (en) * | 2020-12-15 | 2021-03-09 | 重庆理工大学 | Electric heating extrusion disc magneto-rheological and electromagnetic bearing bush friction combined transmission device |
| CN113007242A (en) * | 2021-03-18 | 2021-06-22 | 重庆理工大学 | Shape memory alloy controlled single-variable double-cylinder type magnetorheological automatic heat dissipation device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11231078B2 (en) * | 2015-08-17 | 2022-01-25 | Ton Duc Thang University | Method and apparatus for magneto-rheological brake systems |
| DE102018100390A1 (en) * | 2018-01-10 | 2019-07-11 | Inventus Engineering Gmbh | Magnetorheological braking device |
-
2021
- 2021-07-23 CN CN202110837125.XA patent/CN113431850B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990047271A (en) * | 1997-12-03 | 1999-07-05 | 윤덕용 | Braking system for both load device using magnetorheological fluid |
| WO2004092606A2 (en) * | 2003-04-17 | 2004-10-28 | Victhom Human Bionics Inc. | High power/weight ratio braking device based on shape memory material technology |
| EP1767804A1 (en) * | 2005-09-27 | 2007-03-28 | C.R.F. Societa Consortile per Azioni | Disk-brake device with shape memory damping means |
| DE102015205705A1 (en) * | 2015-03-30 | 2016-10-06 | Robert Bosch Gmbh | Actuator, method of operation |
| CN104895956A (en) * | 2015-06-15 | 2015-09-09 | 重庆理工大学 | Electro-thermo-magnetic shape memory alloy and magnetorheological fluid composite centrifugal clutch |
| CN207470647U (en) * | 2017-10-27 | 2018-06-08 | 重庆理工大学 | A kind of marmem cooperates with cydariform formula magnetorheological fluid brake apparatus |
| CN108087449A (en) * | 2017-12-01 | 2018-05-29 | 江苏华强自动化科技有限公司 | The soft starting device squeezed based on magnetorheological fluid and marmem |
| CN109681545A (en) * | 2019-03-08 | 2019-04-26 | 重庆理工大学 | The magnetorheological fluid of marmem driving combines transmission device with electromagnet-friction |
| CN112460165A (en) * | 2020-12-15 | 2021-03-09 | 重庆理工大学 | Electric heating extrusion disc magneto-rheological and electromagnetic bearing bush friction combined transmission device |
| CN113007242A (en) * | 2021-03-18 | 2021-06-22 | 重庆理工大学 | Shape memory alloy controlled single-variable double-cylinder type magnetorheological automatic heat dissipation device |
Non-Patent Citations (8)
| Title |
|---|
| Shape Localization and Recognition Using a Magnetorheological-Fluid Haptic Display;Rocco Rizzo;《IEEE》;20181231;全文 * |
| 形状记忆合金驱动的磁流变液传动及应用研究;麻建坐;《中国优秀硕士学位论文全文数据库 (工程科技Ⅰ辑)》;20131231;全文 * |
| 热效应下形状记忆合金挤压的磁流变液传动研究;王西;《中国优秀硕士学位论文全文数据库 (工程科技Ⅰ辑)》;20190815;全文 * |
| 热效应下形状记忆合金驱动的磁流变液与滑块摩擦复合传动研究;黄金等;《重庆理工大学学报(自然科学)》;20191215(第12期);全文 * |
| 热效应下记忆合金与磁流变液的复合传动设计研究;刘栗均;《中国优秀硕士学位论文全文数据库 (工程科技II辑)》;20150315;全文 * |
| 电热形状记忆合金与磁流变联合传动性能研究;熊洋等;《机械传动》;20210415;全文 * |
| 电阻形状记忆合金与磁流变联合传动装置分析与设计;谢勇;《中国优秀硕士学位论文全文数据库 (工程科技Ⅰ辑)》;20200815;全文 * |
| 磁流变液与形状记忆合金复合传动分析;陈松等;《机械传动》;20150515(第05期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113431850A (en) | 2021-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113431850B (en) | Electromagnetic extrusion magnetorheological and shape memory alloy friction composite brake | |
| CN110094509B (en) | Magnetic fluid sealing shaft with heat insulation device | |
| GB2215001A (en) | Electro-shear brake | |
| CN104895956B (en) | Electric heating magnetic marmem and magnetic flow liquid composite centrifugal formula clutch | |
| CN206092747U (en) | Spherical centrifugation extrusion magnetic current becomes transmission | |
| CN214092796U (en) | Hot extrusion magneto-rheological and centrifugal slider friction clutch | |
| CN110778618B (en) | Automatic clutch of cylindrical variable-volume magnetorheological fan | |
| CN112460165A (en) | Electric heating extrusion disc magneto-rheological and electromagnetic bearing bush friction combined transmission device | |
| CN110848283B (en) | Temperature control round wedge-shaped magnetorheological fluid clutch | |
| US5186288A (en) | Electro-shear brake | |
| CN109707759B (en) | Arc-shaped magneto-rheological and friction transmission device extruded by electromagnetic thermal memory alloy | |
| CN204692380U (en) | A kind of marmem and magnetic flow liquid composite centrifugal formula clutch | |
| CN111677789A (en) | Electromagnetic friction and centrifugal extrusion magnetorheological soft starting device | |
| CN112032216A (en) | Electromagnetic force extruded cross arc groove magneto-rheological clutch | |
| CN113007242A (en) | Shape memory alloy controlled single-variable double-cylinder type magnetorheological automatic heat dissipation device | |
| CN109681545B (en) | Magnetorheological fluid and electromagnetic friction combined transmission device driven by shape memory alloy | |
| CN212250902U (en) | Centrifugal slider friction and magnetorheological combined speed-limiting brake | |
| CN106949211B (en) | Electromagnetism squeezes and magnetorheological fluid compound gearing | |
| CN111692246A (en) | Hot extrusion volume percentage axle bush type magnetorheological fluid brake | |
| CN212297348U (en) | Variable-volume bearing bush type magnetorheological fluid brake | |
| CN107218320B (en) | Electric current becomes retarder brake | |
| CN113931940B (en) | Self-heating induced variable volume fraction and extrusion reinforced magnetorheological transmission device | |
| CN113864374B (en) | Shape memory alloy compacted sliding block and electromagnetic friction combined brake | |
| CN218817744U (en) | Memory spring compensated double-disk liquid cooling magnetorheological retarder | |
| CN213870827U (en) | Magnetorheological clutch based on shape memory alloy sliding block extrusion caused by coil heating |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |