CN220286254U - Magnetic fluid clutch with variable disc gap - Google Patents
Magnetic fluid clutch with variable disc gap Download PDFInfo
- Publication number
- CN220286254U CN220286254U CN202321574954.4U CN202321574954U CN220286254U CN 220286254 U CN220286254 U CN 220286254U CN 202321574954 U CN202321574954 U CN 202321574954U CN 220286254 U CN220286254 U CN 220286254U
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- gap
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- 239000011553 magnetic fluid Substances 0.000 title claims abstract description 26
- 238000010008 shearing Methods 0.000 claims abstract description 26
- 206010066054 Dysmorphism Diseases 0.000 claims description 6
- 230000033001 locomotion Effects 0.000 claims description 5
- 239000010839 body fluid Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 20
- 230000009471 action Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Mechanical Operated Clutches (AREA)
Abstract
The utility model relates to a variable disc gap magnetic fluid clutch, which comprises a shearing disc, a magnetic field generating device and a disc gap adjusting device; the shearing disc comprises a driving shaft, a driven shaft, a driving disc, a driven disc and a disc cover, wherein the driven disc is fixedly connected to the inner wall of the shell, and a reset spring which is sleeved on the driving shaft and is in a compressed state is arranged between the two driving discs; the magnetic field generating device is sleeved outside the disc body; the disc gap adjusting devices are two and are respectively connected to the driving shaft and the driven shaft to adjust the gap between the driving disc and the driven disc. The variable disc gap magnetorheological fluid clutch changes the structure of the shearing disc, adopts a mode that two driving discs clamp a driven disc to enable the shearing surface to be more, and simultaneously adds the variable of the adjustable shearing disc gap besides the variable magnetic field, so that the variable disc gap magnetorheological fluid clutch can adapt to various working conditions by multivariable control, and can be applied to the aspects of clutch, mechanical soft start, constant torsion control and the like for transmitting power.
Description
Technical Field
The utility model relates to the technical field of magnetorheological fluid clutches, in particular to a variable disc gap magnetic fluid clutch.
Background
The magnetorheological fluid clutch is a mechanical device based on the characteristic of solidification of a magnetorheological fluid material, and torque is transmitted by means of shear yield stress generated by the magnetorheological fluid under the action of an external magnetic field, namely, a magnetorheological fluid shearing working mode is utilized. When no magnetic field acts, the magnetorheological fluid is represented as a common Newtonian fluid, only torque generated by common liquid viscous resistance is transmitted, and the clutch is in a disconnected state; when a magnetic field with certain strength is applied, magnetic particles of the magnetorheological fluid are distributed in a chain shape along the magnetic field, and when the rotating speed difference exists at two sides of the clutch, the magnetic chain is cut, and a larger shearing yield stress is generated, so that enough torque can be transmitted to enable the clutch to work normally. The transmitted shear torque can be controlled by controlling the strength of the magnetic field due to the nature of the magnetorheological fluid itself. Therefore, the magnetorheological fluid clutch has the advantages of stable transmission torque, simple structure, easy control, low energy consumption, long service life and the like.
The principle of the conventional magnetorheological fluid clutch in the current research is basically the same as that of the clutch of the single disc type, and the magnetorheological fluid between the driving disc and the driven disc enters different solidification states by changing the strength of an external magnetic field, so that shearing stress is generated to drive the driven disc to rotate to transfer torque. Theoretically, under the same condition, the gap between the driving disc and the driven disc can also have an influence on the transmitted maximum torque; in general, the smaller the gap, the larger the torque transmitted, but the larger the lost motion resistance (when the magnetic field is 0). The smaller the gap is, the better, and the smaller the gap is, so that the magnetorheological fluid layer between the shearing surfaces of the driving disk and the driven disk is too thin, and the two are basically in a dry friction state, and at the moment, large torque cannot be transmitted and the heating value is large. Therefore, the novel variable disc gap magnetic fluid clutch is designed for the research of the development of the disc type magneto-rheological fluid at the present stage.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provides a variable disc gap magnetic fluid clutch which is suitable for different working conditions.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the magnetic fluid clutch with variable disc gap comprises a shearing disc, a magnetic field generating device and a disc gap adjusting device;
the shearing disc comprises a driving shaft, a driven shaft, a driving disc, a driven disc and a disc cover, wherein the front end of the driven shaft is provided with a shell, the shell and the disc cover are connected to form a disc body, a closed cavity is formed in the disc body, and magnetic fluid is filled in the closed cavity; the driving shaft and the driven shaft are coaxially arranged, and the tail end of the driving shaft is rotationally connected in the closed cavity;
the driven plate is fixedly connected to the inner wall of the shell, the two driving plates are respectively connected to the driving shaft through splines, the driven plate is positioned between the two driving plates, the two driving plates can also axially slide along the driving shaft when doing circumferential rotary motion along with the driving shaft, and a reset spring which is sleeved on the driving shaft and is in a compression state is arranged between the two driving plates;
the magnetic field generating device is sleeved outside the disc body and used for generating a magnetic field;
the two disc gap adjusting devices are respectively connected to the driving shaft and the driven shaft, and the two disc gap adjusting devices respectively act on the driving discs on the corresponding sides so as to adjust the gaps between the driving discs and the driven discs.
Further, the magnetic field generating device comprises a coil fixing seat, an exciting coil and two protecting covers, wherein the exciting coil is fixed on the coil fixing seat in a nested mode, and the two protecting covers are respectively fixed on two sides of the coil fixing seat in a wrapping mode.
Further, the disc gap adjusting device comprises a fixed disc, a knob disc and a push sleeve, wherein the fixed disc is fixedly sleeved on a driving shaft or a driven shaft through an expanding device, the knob disc is rotatably sleeved on the driving shaft or the driven shaft, three unlocking buttons are arranged on the disc wall of the knob disc at equal intervals along the circumferential direction, unlocking push rods capable of radially moving along the knob disc are respectively connected with the inner side end parts of the unlocking buttons, button reset elastic pieces are connected in the knob disc and radially propped against the inner sides of the heads of the unlocking push rods, and clamping grooves are respectively arranged on the periphery of an inner hole of the knob disc corresponding to the unlocking push rods; the inner side disc surface of the fixed disc is provided with three locking blocks capable of sliding along the axial direction at equal intervals along the circumferential direction, the fixed disc is connected with locking block reset elastic pieces, the button reset elastic pieces are propped against each locking block along the axial direction, and the front ends of the locking blocks are provided with inclined planes; when the knob disc is in a locking state, the inner side end parts of the unlocking push rods are propped against the inclined planes of the corresponding locking blocks; the push sleeve is fixed with the ejector pin that pushes away in corresponding initiative dish on the terminal surface towards initiative dish, pushes away the terminal surface of cover towards knob dish and is the dysmorphism face, and this dysmorphism face comprises three highly different planes, passes through curved surface transition between two adjacent planes, be fixed with protruding point on the terminal surface towards push sleeve of knob dish, this protruding point acts on the dysmorphism face of push sleeve.
Further, the tail end of the driving shaft is connected to the inner cavity of the driven shaft shell through a bearing.
Furthermore, a plurality of ribs which are arranged at intervals along the circumferential direction are respectively arranged on the opposite disc surfaces of the driving disc and the driven disc.
Further, the magnetic field generating device comprises a coil fixing seat, an exciting coil and two protecting covers, wherein the exciting coil is fixed on the coil fixing seat in a nested mode, and the two protecting covers are respectively fixed on two sides of the coil fixing seat in a wrapping mode.
By adopting the technical scheme, the variable disc gap magnetorheological fluid clutch changes the structure of the shearing disc, adopts the mode that the two driving discs clamp the driven disc to enable the shearing disc to have more shearing surfaces, and simultaneously, the variable magnetic field which is the variable is additionally provided with the variable of the adjustable gap of the shearing disc, so that the variable gap magnetorheological fluid clutch can adapt to various working conditions, and can be applied to the aspects of clutch, mechanical soft start, constant torque control and the like for transmitting power
Drawings
The utility model is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is an overall cross-sectional view of a variable disc gap magnetic fluid clutch of the present utility model;
FIG. 2 is a cross-sectional view of a shear disk;
FIG. 3 is a cross-sectional view of a magnetic field generating device;
FIG. 4 is a cross-sectional view of the disc space adjusting device;
FIG. 5 is an exploded view of the disc space adjusting device (push sleeve omitted);
FIG. 6 is a schematic diagram of a driving disk and a driven disk;
FIG. 7 is a schematic illustration of a push sleeve;
FIG. 8 is a schematic view of a knob disk;
fig. 9 is a schematic diagram of a disc space adjusting device.
Description of the embodiments
As shown in fig. 1 to 9, the variable disc gap magnetic fluid clutch of the present utility model comprises a shearing disc 1, a magnetic field generating device 2 and a disc gap adjusting device 3;
the shearing disc 1 comprises a driving shaft 11, a driven shaft 12, a driving disc 13, a driven disc 14 and a disc cover 15, wherein the front end of the driven shaft 12 is provided with a shell 16, the shell 16 and the disc cover 15 are connected to form a disc body, a closed cavity is formed in the disc body, and magnetic fluid is filled in the closed cavity; the driving shaft 11 and the driven shaft 12 are coaxially arranged, and the tail end of the driving shaft 11 is rotatably connected in the closed cavity;
the driven plate 14 is fixedly connected to the inner wall of the shell 16, the driving plates 13 are two, the two driving plates 13 are respectively connected to the driving shaft 11 through splines, the driven plate 14 is located between the two driving plates 13, the two driving plates 13 can also axially slide along the driving shaft 11 when doing circumferential rotation movement along with the driving shaft 11, and a reset spring 17 which is sleeved on the driving shaft 11 and is in a compression state is arranged between the two driving plates 13.
The power is transmitted to the driving disk 13 from the input of the driving shaft 11 through the spline, the power of the driving disk 13 is transmitted to the driven disk 14 again under the shearing action of the magnetic fluid, and finally the driven disk 14 is transmitted to the output of the driven shaft 12. The return spring 17 is used for resetting the play of the driving disk 13, and when the external play adjusting device 3 is not present, the play is reset to a maximum value under the action of the return spring 17. Meanwhile, the tail end of the driving shaft 11 is connected in the inner cavity of the shell 16 of the driven shaft 12 through a bearing, so that the coaxiality of two-shaft transmission is higher, and the transmission is smoother.
The driving disk 13 and the driven disk 14 are provided with a plurality of ribs 131 and 141, respectively, which are arranged at intervals in the circumferential direction on the disk surfaces facing each other. The ribs 131 and 141 on the disk surface can not only increase shearing friction, but also store a part of magnetic fluid, so that dry friction of the disk surface caused by too little magnetic fluid is avoided when the gap is adjusted too little. The driven plate 14 is clamped between the driving plates 13, and compared with a common single-plate magnetic fluid clutch, the shearing surface is larger, and the maximum torque which can be transmitted is larger. The outer race of the driven disk 14 is bolted to the housing 16 of the driven shaft 12 to transmit power.
The magnetic field generating device 2 is sleeved outside the disc body and is used for generating an adjustable magnetic field (by changing the magnitude of current input to the exciting coil 22), and the effect of the magnetic field generating device is mainly to change the fluid property of magnetic fluid between the shell 16 of the driven shaft 12 and the disc cover 15 so as to change the shearing stress of the magnetic fluid. The magnetic field generating device 2 comprises a coil fixing seat 21, an exciting coil 22 and two protecting covers 23, wherein the exciting coil 22 is nested and fixed on the coil fixing seat 21, and the two protecting covers 23 are respectively coated and fixed (through clamping rings) on two sides of the coil fixing seat 21. The protecting cover 23 and the coil fixing seat 21 can be supported by magnetic conductive materials, so that a magnetic loop can be better optimized, and a stronger magnetic field acts on internal magnetic fluid; the maximum outer dimensions of the magnetic field generating means 2 are not limited and can be specifically tailored.
The two disc gap adjusting devices 3 are provided, the two disc gap adjusting devices 3 are respectively connected to the driving shaft 11 and the driven shaft 12, and the two disc gap adjusting devices 3 respectively act on the driving disc 13 at the corresponding side to adjust the gap between the driving disc 13 and the driven disc 14. Specifically, the disc gap adjusting device 3 includes a fixed disc 31, a knob disc 32 and a push sleeve 33, the fixed disc 31 is fixedly sleeved on the driving shaft 11 or the driven shaft 12 through an expanding device 34, the knob disc 32 is rotatably sleeved on the driving shaft 11 or the driven shaft 12, three unlocking buttons 35 are arranged on the disc wall of the knob disc 32 at equal intervals along the circumferential direction, the inner side end parts of the unlocking buttons 35 are respectively connected with an unlocking push rod 36 capable of radially moving along the knob disc 32, a button reset elastic piece 37 is connected in the knob disc 32, the button reset elastic piece 37 is radially propped against the inner side of the head of each unlocking push rod 36, and the periphery of an inner hole of the knob disc 32 is respectively provided with a clamping groove 321 corresponding to each unlocking push rod 36; three locking blocks 38 capable of sliding along the axial direction are arranged on the inner disc surface of the fixed disc 31 at equal intervals along the circumferential direction, the fixed disc 31 is connected with locking block reset elastic pieces 39, the button reset elastic pieces 37 are propped against each locking block 38 along the axial direction, and the front ends of the locking blocks 38 are provided with inclined planes; when the knob disc 32 is in the locking state, the inner side end part of each unlocking push rod 36 is propped against the inclined surface of the corresponding locking block 38; the end face of the push sleeve 33 facing the driving disc 13 is fixedly provided with a push rod 331 propped against the corresponding driving disc 13, the end face of the push sleeve 33 facing the knob disc 32 is a special-shaped surface 332, the special-shaped surface 332 consists of three planes with different heights, two adjacent planes are transited through a curved surface, the end face of the knob disc 32 facing the push sleeve 33 is fixedly provided with a protruding point 322, and the protruding point 322 acts on the special-shaped surface 332 of the push sleeve 33.
The operation method of the disc gap adjusting device 3 comprises the following steps: simultaneously, when three unlocking buttons 35 (which can be loosened after being rotated by a small angle) are pressed down, the knob disc 32 can be rotated, and when any one of the I, II and III marks on the disc is rotated to an arrow on the fixed disc 31, clicking sound is generated, and the knob disc 32 is locked again, at the moment, the corresponding gap is a certain gear, the total three gears are adjustable, the gap is the largest, and the gap is the smallest.
The principle sketch of the backlash adjustment device 3 is shown in fig. 9 below, wherein the projection 322 slides on the profiled surface 332 of the push sleeve 33 when the knob disk 32 is rotated. This action corresponds to the left-right movement of knob disk 32 in the diagram, and then profiled surface 332 of push sleeve 33 moves up and down, pushing driving disk 13 to change the gap between driving disk 13 and driven disk 14. The clearance adjustment principle of the left driving disk 13 and the right driving disk 13 is the same, but the clearance adjustment mechanism is just a fixed disk 31, one fixed on the driven shaft 12, the other fixed on the driving shaft 11, and the pushing sleeve 33 adopts sealing measures on the disk cover 15 or the shell 16 of the driven shaft 12 to prevent the leakage of magnetic fluid.
In the state of the non-adjustment knob disc 32, the knob disc 32 is fixedly clamped on the fixed disc 31 by means of the locking piece 38, and at the moment, the knob disc 32 cannot independently rotate and can only rotate along with the fixed disc 31 and the shaft on which the fixed disc 31 is positioned. When the unlocking button 35 is pressed, the unlocking push rod 36 moves downwards to push the locking piece 38 outwards from the clamping groove 321 of the knob disc 32 in the axial direction, and the knob disc 32 can rotate to change the disc gap. In the process of pushing the locking piece 38 outwards, the restoring spring 17 of the locking piece 38 is in a force storage state, and when the button is released after the locking piece 38 is slightly rotated by a small angle, the locking piece 38 is tightly pressed on the knob disc 32 until the locking piece 38 is reset to be locked on the knob disc 32 when the clamping groove 321 corresponding to the next gear is reached.
The variable disc magnetorheological fluid clutch changes the structure of the shearing disc 1, so that the shearing surface is more; meanwhile, the variable of the adjustable gap of the shearing disc 1 is added besides the variable magnetic field, so that the variable-variable control can adapt to various working conditions, and can be applied to the aspects of clutch, mechanical soft start, constant torque control and the like of power transmission.
While particular embodiments of the present utility model have been described above, it will be understood by those skilled in the art that this is by way of example only, and that various changes and modifications may be made to this embodiment without departing from the spirit and scope of the utility model, but these changes and modifications are within the scope of the utility model.
Claims (6)
1. The magnetic fluid clutch with the variable disc gap is characterized in that: comprises a shearing disc, a magnetic field generating device and a disc gap adjusting device;
the shearing disc comprises a driving shaft, a driven shaft, a driving disc, a driven disc and a disc cover, wherein the front end of the driven shaft is provided with a shell, the shell and the disc cover are connected to form a disc body, a closed cavity is formed in the disc body, and magnetic fluid is filled in the closed cavity; the driving shaft and the driven shaft are coaxially arranged, and the tail end of the driving shaft is rotationally connected in the closed cavity;
the driven plate is fixedly connected to the inner wall of the shell, the two driving plates are respectively connected to the driving shaft through splines, the driven plate is positioned between the two driving plates, the two driving plates can also axially slide along the driving shaft when doing circumferential rotary motion along with the driving shaft, and a reset spring which is sleeved on the driving shaft and is in a compression state is arranged between the two driving plates;
the magnetic field generating device is sleeved outside the disc body and used for generating a magnetic field;
the two disc gap adjusting devices are respectively connected to the driving shaft and the driven shaft, and the two disc gap adjusting devices respectively act on the driving discs on the corresponding sides so as to adjust the gaps between the driving discs and the driven discs.
2. A variable disc gap magnetic fluid clutch as claimed in claim 1, wherein: the magnetic field generating device comprises a coil fixing seat, an exciting coil and two protecting covers, wherein the exciting coil is fixed on the coil fixing seat in a nested mode, and the two protecting covers are respectively fixed on two sides of the coil fixing seat in a wrapping mode.
3. A variable disc gap magnetic fluid clutch as claimed in claim 1, wherein: the disc gap adjusting device comprises a fixed disc, a knob disc and a push sleeve, wherein the fixed disc is fixedly sleeved on a driving shaft or a driven shaft through an expanding device, the knob disc is rotatably sleeved on the driving shaft or the driven shaft, three unlocking buttons are arranged on the disc wall of the knob disc at equal intervals along the circumferential direction, unlocking push rods capable of radially moving along the knob disc are respectively connected with the inner side end parts of the unlocking buttons, button reset elastic pieces are connected in the knob disc and radially propped against the inner sides of the heads of the unlocking push rods, and clamping grooves are respectively arranged on the peripheries of inner holes of the knob disc corresponding to the unlocking push rods; the inner side disc surface of the fixed disc is provided with three locking blocks capable of sliding along the axial direction at equal intervals along the circumferential direction, the fixed disc is connected with locking block reset elastic pieces, the button reset elastic pieces are propped against each locking block along the axial direction, and the front ends of the locking blocks are provided with inclined planes; when the knob disc is in a locking state, the inner side end parts of the unlocking push rods are propped against the inclined planes of the corresponding locking blocks; the push sleeve is fixed with the ejector pin that pushes against corresponding initiative dish on the terminal surface towards initiative dish, and the terminal surface towards knob dish of push sleeve is the dysmorphism face, and this dysmorphism face comprises three highly different planes, be fixed with protruding point on the terminal surface towards push sleeve of knob dish, this protruding point acts on the dysmorphism face of push sleeve.
4. A variable disc gap magnetic fluid clutch as claimed in claim 1, wherein: the tail end of the driving shaft is connected with the inner cavity of the driven shaft shell through a bearing.
5. A variable disc gap magnetic fluid clutch as claimed in claim 1, wherein: the driving disc and the driven disc are provided with a plurality of ribs which are arranged at intervals along the circumferential direction on the opposite disc surfaces respectively.
6. A variable disc gap magnetic fluid clutch as claimed in claim 1, wherein: the magnetic field generating device comprises a coil fixing seat, an exciting coil and two protecting covers, wherein the exciting coil is fixed on the coil fixing seat in a nested mode, and the two protecting covers are respectively fixed on two sides of the coil fixing seat in a wrapping mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321574954.4U CN220286254U (en) | 2023-06-20 | 2023-06-20 | Magnetic fluid clutch with variable disc gap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321574954.4U CN220286254U (en) | 2023-06-20 | 2023-06-20 | Magnetic fluid clutch with variable disc gap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220286254U true CN220286254U (en) | 2024-01-02 |
Family
ID=89328827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321574954.4U Active CN220286254U (en) | 2023-06-20 | 2023-06-20 | Magnetic fluid clutch with variable disc gap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220286254U (en) |
-
2023
- 2023-06-20 CN CN202321574954.4U patent/CN220286254U/en active Active
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