CN111623056A - Braking device based on magneto-rheological effect - Google Patents
Braking device based on magneto-rheological effect Download PDFInfo
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- CN111623056A CN111623056A CN202010610378.9A CN202010610378A CN111623056A CN 111623056 A CN111623056 A CN 111623056A CN 202010610378 A CN202010610378 A CN 202010610378A CN 111623056 A CN111623056 A CN 111623056A
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- brake
- brake disc
- shell
- electromagnetic coil
- accommodating cavity
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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
- 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
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Abstract
The invention provides a braking device based on a magneto-rheological effect, which relates to the technical field of brakes and comprises: the brake device comprises a shell, a brake actuating member and a magnetic conduction assembly; the shell is approximately disc-shaped and consists of two end covers which are configured mutually, an internal accommodating cavity is formed by covering the two end covers, and magnetorheological fluid is filled in the accommodating cavity; the brake executing piece comprises a transmission shaft transversely arranged in the shell in a penetrating mode and a brake disc fixedly connected with the transmission shaft, the brake disc is rotatably arranged in the accommodating cavity, and a plurality of fin-shaped bulges are distributed on two end faces of the brake disc; the magnetic conduction component is provided with an electromagnetic coil which is positioned outside the containing cavity and is closely arranged on one of the end covers. The two end surfaces of the brake disc are provided with the fin-shaped bulges, and the plurality of bulges are matched with the magnetorheological fluid, so that the braking torque of the magnetorheological fluid on the brake disc is improved.
Description
Technical Field
The invention relates to the technical field of brakes, in particular to a brake device based on a magneto-rheological effect.
Background
The magnetic rheological liquid is an intelligent material, generates rheological effect under the action of an external magnetic field, and instantly presents solid-like characteristics from initial Newtonian fluid characteristics. The magnetorheological fluid mainly comprises soft magnetic particles, a base carrier liquid, a surface additive and the like, wherein the soft magnetic particles coated with the surface additive are in a suspension state in the base carrier liquid, the suspension is in a free flowing state (liquid state) when no external magnetic field acts, and a solidification phenomenon occurs under the action of the external magnetic field, and the suspension is represented as a viscoplastic fluid (semi-solid state) with certain shearing force. The magnetorheological process has the advantages of rapid reaction, reversible effect, low energy consumption, strong adaptability and the like.
The magneto-rheological fluid braking system is a novel braking technology developed by taking magneto-rheological fluid as a working medium, and adopts a method of adjusting the intensity of an external magnetic field of the magneto-rheological fluid to change the shear yield stress of the magneto-rheological fluid so as to realize stepless control of braking torque.
At present, a plurality of magnetorheological fluid braking systems appear at home and abroad, but in the existing magnetorheological fluid braking system, the magnet exciting coil is mostly in an integral cylindrical structure, the magnet exciting coil is placed inside the device, and the disassembly and the assembly are complex. In addition, the existing brake disc and magnetorheological fluid are complicated in configuration, large braking torque is difficult to obtain, and meanwhile, large energy loss exists between the existing brake disc and the magnetorheological fluid, so that the design requirements cannot be met.
Disclosure of Invention
The invention discloses a braking device based on a magnetorheological effect, and aims to solve the problems of complex structure, insufficient braking torque and the like in the conventional magnetorheological fluid braking system.
The invention adopts the following scheme:
the application provides a arresting gear based on magnetic current becomes effect, includes: the brake device comprises a shell, a brake actuating member and a magnetic conduction assembly; the shell is approximately disc-shaped and consists of two end covers which are configured mutually, an internal accommodating cavity is formed by covering the two end covers, and magnetorheological fluid is filled in the accommodating cavity; the brake executing piece comprises a transmission shaft transversely arranged in the shell in a penetrating mode and a brake disc fixedly connected with the transmission shaft, the brake disc is rotatably arranged in the accommodating cavity, and a plurality of fin-shaped bulges are distributed on two end faces of the brake disc; the magnetic conduction component is provided with an electromagnetic coil which is positioned outside the containing cavity and is closely arranged on one of the end covers.
As a further improvement, the brake disc is approximately centrally arranged in the accommodating cavity, and the transmission shaft penetrates through the shell and is in rotary connection with the end cover through a sealed bearing.
In a further improvement, the protrusions are regularly arranged at intervals along the rotation direction of the brake disc and are disposed at the positions of the whole end surfaces, and the protrusions located at both end surfaces of the brake disc are symmetrically arranged with each other.
As a further improvement, the protrusions are tapered protrusions, each of which has a thickness that increases gradually in the circumferential direction of the brake disk and a width that increases gradually in the radial direction of the brake disk.
As a further improvement, the direction in which the thickness of the projection increases is opposite to the rotation direction of the brake disc, and the width of the projection increases from the direction away from the transmission shaft.
As a further improvement, a protective shell covers the end face of the end cover where the electromagnetic coil is located, and an installation cavity for placing the electromagnetic coil is formed between the protective shell and the end cover.
As a further improvement, the size of the protective shell is smaller than the size of the end cap.
As a further improvement, the two end covers are made of different materials; the end cover positioned on one side of the electromagnetic coil is made of magnetic conduction materials, and the other end cover is made of magnetic isolation materials.
As a further improvement, an iron core is arranged in the electromagnetic coil, and the electromagnetic coil is electrified to generate a magnetic field arranged in the same direction, so that the shear stress generated by the magnetorheological fluid filled in the accommodating cavity is enabled to further provide braking torque for the brake disc.
As a further improvement, the two end covers are matched and arranged in a quick-release mode.
By adopting the technical scheme, the invention can obtain the following technical effects:
the brake device is a novel brake technology designed based on a magneto-rheological effect. Its simple structure and operation are convenient, through the holding intracavity packing at the casing have magnetorheological suspensions, and the rotatable configuration of brake disc is in the holding intracavity, and one of them end cover department just is located the solenoid outside the holding chamber and produces magnetic field after the circular telegram for the shear stress that magnetorheological suspensions produced, and then provide braking torque to the brake disc. Wherein, the both ends face of brake disc has laid and is the arch of fin form, cooperatees with magnetorheological suspensions via a plurality of archs to improve the braking moment of magnetorheological suspensions to the brake disc, in the magnetic field that produces under the same circular telegram circumstances, the braking efficiency of this application is higher and more stable, very big energy loss of having avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of a brake apparatus according to an embodiment of the present invention;
FIG. 2 is a disassembled schematic view of FIG. 1;
FIG. 3 is a schematic view of a brake apparatus according to an embodiment of the present invention from another perspective;
FIG. 4 is a disassembled schematic view of FIG. 3;
FIG. 5 is a sectional view of a brake apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a brake actuator of the brake apparatus according to the embodiment of the present invention;
fig. 7 is a schematic view of the structure of fig. 6 from another perspective.
Icon: 1-a shell; 11-end cap; 2-a brake actuator; 21-a transmission shaft; 22-a brake disc; 221-a bump; 3-a magnetic conductive component; 31-an electromagnetic coil; 4-sealing the bearing; 5-protective shell.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Examples
With reference to fig. 1 to 4, the present embodiment provides a braking device based on a magnetorheological effect, including: the brake device comprises a shell 1, a brake actuator 2 and a magnetic conduction assembly 3. The brake device is a novel brake technology designed based on the magneto-rheological effect, and is suitable for the field of braking of automobiles or rotating equipment and the like.
In the present embodiment, the housing 1 is substantially disc-shaped and is composed of two end caps 11 arranged to each other. An inner containing cavity is formed by covering the two end covers 11, and magnetorheological fluid (not shown) is filled in the containing cavity. The brake actuator 2 includes a transmission shaft 21 transversely disposed through the housing 1 and a brake disc 22 fixedly connected to the transmission shaft 21. The brake disc 22 is rotatably disposed in the accommodating cavity, and a plurality of fin-shaped protrusions 221 are disposed on two end surfaces of the brake disc 22. The magnetic conducting component 3 has an electromagnetic coil 31, and the electromagnetic coil 31 is located outside the accommodating cavity and configured on one of the end caps 11 in a close fit manner.
In this embodiment, magnetorheological fluid is filled in the accommodating cavity of the housing 1, and the brake disc 22 is rotatably disposed in the accommodating cavity, wherein the electromagnetic coil 31 at one end cover 11 and located outside the accommodating cavity generates a magnetic field after being energized, so that shear stress generated by the magnetorheological fluid is generated, and braking torque is provided for the brake disc 22. Wherein, the both ends face of brake disc 22 is laid and is the arch 221 of fin form, cooperatees with magnetorheological suspensions via a plurality of archs 221 to improve magnetorheological suspensions to the braking moment of brake disc 22, in the magnetic field that produces under the same circular telegram circumstances, the braking efficiency of this application is higher and more stable, very big having avoided the energy loss.
Preferably, the brake disc 22 is substantially centrally disposed in the accommodating cavity, and the transmission shaft 21 penetrates through the housing 1 and is rotatably connected with the end cover 11 through the sealed bearing 4. The transmission shaft 21 is rotatably connected with the shell 1, so that the transmission shaft 21 drives the brake disc 22 to relatively rotate in the shell 1 without being influenced by friction resistance between the brake disc and the end cover 11, and the brake disc 22 is arranged in the center, so that magnetorheological fluid filled in the accommodating cavity can be fully contacted with the end surface of the brake disc 22, and the braking effect is further improved.
Referring to fig. 4 to 7, the protrusions 221 are regularly arranged along the rotation direction of the brake disc 22 at intervals and are disposed on the entire end surface, and the protrusions 221 located on the two end surfaces of the brake disc 22 are symmetrically disposed. Specifically, the protrusions 221 are tapered convex portions each of which has a thickness that increases gradually in the circumferential direction of the brake disc 22 and a width that increases gradually in the radial direction of the brake disc 22. The gradually changing fin-shaped protrusion 221 allows the fluid resistance during the rotation of the brake disc 22 to be controlled, and the contact area between the brake disc and the magnetorheological fluid to be increased.
Specifically, the direction in which the thickness of the projection increases is opposite to the rotation direction of the brake disk 22, and the width of the projection increases from the direction away from the transmission shaft 21. The thickness is gradually reduced along the rotation direction of the brake disc 22, so that the fluid resistance of the brake disc 22 in the rotation process is reduced, the viscous resistance in the zero magnetic field (the electromagnetic coil 31 is not electrified) is further reduced, the heat productivity between the magnetorheological fluid and the shell 1 and between the magnetorheological fluid and the brake disc 22 is reduced, the energy loss is reduced, and the stability of the braking device is effectively ensured. Moreover, the width of the convex part is gradually increased along the periphery close to the brake disc 22, so that the width of the end far away from the center of the rotation circle of the brake disc 22 is larger than the width of the convex part close to the center of the circle at the same rotation speed, and under the condition that the linear speeds of different positions of the same convex part are different, the state of relatively consistent stress is achieved through different contact areas of the convex part and the magnetorheological fluid, and the brake disc 22 is ensured to be in a stable state.
It should be noted that an iron core (not shown) is disposed inside the electromagnetic coil 31, and the electromagnetic coil 31 is energized to generate a magnetic field arranged in the same direction, so that the shear stress generated by the magnetorheological fluid filled in the accommodating cavity is applied to provide the braking torque to the brake disc 22. Under the action of an external magnetic field, the magnetorheological fluid is solidified. So that the viscous plastic fluid with certain shearing force is formed. The magnetorheological fluid in this state is in sufficient contact fit with the protrusions 221 on the brake disc 22 to provide shear stress, so that the rotating brake disc 22 is decelerated under stress in the opposite direction to the shear stress to achieve a braking effect.
Referring to fig. 3 to 5, a protective shell 5 covers an end surface of the end cap 11 where the electromagnetic coil 31 is located, and an installation cavity for placing the electromagnetic coil 31 is formed between the protective shell 5 and the end cap 11. In the present embodiment, both ends of the electromagnetic coil 31 for power supply are exposed to the outside through the through hole opened in the protective case 5, so as to facilitate the access of the external power supply. Since the housing 1 and the transmission shaft 21 are in a relative standing state through the bearing in a rotating fit, interference on connection of the electromagnetic coil 31 and an external power supply is avoided.
Wherein the size of the protective shell 5 is smaller than the size of the end cap 11. Make the protective housing 5 depend on and arrange the outside position of casing 1 in, under the condition that does not influence whole outward appearance, and guaranteed arresting gear's wholeness. In particular, the end caps 11 are made of different materials. The end cap 11 on one side of the electromagnetic coil 31 is made of magnetic conductive material, and the other end cap 11 is made of magnetic isolation material. The magnetic material is a material with high magnetic permeability, preferably iron, cobalt, nickel and their alloys. The magnetism isolating material is a non-magnetic material and is a material with low magnetic permeability, and preferably is an aluminum material or a copper material. The end cover 11 with good magnetic conductivity is used to facilitate the effective transmission of the magnetic field provided in the electromagnetic coil 31.
It should be mentioned that the two end caps 11 are arranged in a quick-release manner. The space between the two end covers 11 is opened to expose the brake actuating member 2 and the magnetorheological fluid inside, so that the replacement and the maintenance are convenient. The connection can be realized by fasteners such as bolts or the like, or by snap-in press-fit connection.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention.
Claims (10)
1. A magnetorheological effect based brake apparatus, comprising:
the magnetorheological fluid generator comprises a shell, a shell and a fluid flow control device, wherein the shell is approximately disc-shaped and consists of two end covers which are mutually configured, an internal accommodating cavity is formed by covering the two end covers, and magnetorheological fluid is filled in the accommodating cavity;
the brake executing piece comprises a transmission shaft transversely arranged in the shell in a penetrating way and a brake disc fixedly connected with the transmission shaft, the brake disc is rotatably arranged in the accommodating cavity, and a plurality of fin-shaped bulges are distributed on two end faces of the brake disc;
the magnetic conduction component is provided with an electromagnetic coil which is positioned outside the containing cavity and is closely arranged on one of the end covers.
2. The brake apparatus of claim 1, wherein the brake disc is substantially centrally disposed within the receiving cavity, and wherein the drive shaft extends through the housing and is rotatably coupled to the end cap by a sealed bearing.
3. The brake device according to claim 1, wherein the protrusions are regularly arranged at intervals in the rotational direction of the brake disc and are disposed at positions on the entire end surfaces, and the protrusions located on both end surfaces of the brake disc are symmetrically disposed with respect to each other.
4. A brake apparatus according to claim 3, wherein the protrusions are tapered protrusions, each of which has a thickness that increases gradually in a circumferential direction of the brake disc and a width that increases gradually in a radial direction of the brake disc.
5. The brake apparatus of claim 4, wherein the protrusion increases in thickness in a direction opposite to a rotation direction of the brake disc, and the width of the protrusion increases from a direction away from the transmission shaft.
6. The brake device according to claim 1, wherein a protective shell covers the end face of the end cover where the electromagnetic coil is located, and a mounting cavity for placing the electromagnetic coil is formed between the protective shell and the end cover.
7. The brake apparatus of claim 6, wherein the protective shell is smaller in size than the end cap.
8. The brake apparatus of claim 1, wherein said end caps are of different materials; the end cover positioned on one side of the electromagnetic coil is made of magnetic conduction materials, and the other end cover is made of magnetic isolation materials.
9. The braking device according to claim 1, wherein an iron core is arranged inside the electromagnetic coil, and the electromagnetic coil is electrified to generate magnetic fields arranged in the same direction, so that shear stress generated by the magnetorheological fluid filled in the accommodating cavity is enabled to provide braking torque for the brake disc.
10. The brake apparatus of claim 1, wherein the end caps are removably coupled to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010610378.9A CN111623056A (en) | 2020-06-30 | 2020-06-30 | Braking device based on magneto-rheological effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010610378.9A CN111623056A (en) | 2020-06-30 | 2020-06-30 | Braking device based on magneto-rheological effect |
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| Publication Number | Publication Date |
|---|---|
| CN111623056A true CN111623056A (en) | 2020-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010610378.9A Pending CN111623056A (en) | 2020-06-30 | 2020-06-30 | Braking device based on magneto-rheological effect |
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| CN (1) | CN111623056A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202884A (en) * | 2021-05-21 | 2021-08-03 | 吉林大学 | Hydraulic control self-adjustment rectangular clutch based on magnetorheological fluid |
| CN113883184A (en) * | 2021-09-15 | 2022-01-04 | 江苏大学 | Magneto-rheological clutch with groove structure transmission disc |
-
2020
- 2020-06-30 CN CN202010610378.9A patent/CN111623056A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113202884A (en) * | 2021-05-21 | 2021-08-03 | 吉林大学 | Hydraulic control self-adjustment rectangular clutch based on magnetorheological fluid |
| CN113883184A (en) * | 2021-09-15 | 2022-01-04 | 江苏大学 | Magneto-rheological clutch with groove structure transmission disc |
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