A non-slip roller type magnetorheological stepless power transmission device

Abstract

The present invention discloses a non-slip roller type magnetorheological stepless speed regulation device. It comprises an active component and a driven component in a centrally symmetrical cylindrical roller structure; the active component comprises an active shaft (3), an active shaft bearing (7) mounted in cooperation with the active shaft, and an active roller (4) connected and fixed to the active shaft by a key; the driven component comprises a driven shaft (17), a driven shaft bearing (12) mounted in cooperation with the driven shaft, and a driven roller (11) connected and fixed to the driven shaft by a key; active roller magnetic poles (10) are movably mounted at both ends of the active roller, and driven roller magnetic poles (19) are movably mounted at both ends of the driven roller; an axial excitation coil, a circumferential excitation coil and a radial excitation coil are respectively arranged in the active roller and the driven roller. The present invention can realize non-slip stepless speed regulation in the transmission process, effectively solve the heat generation / heat dissipation problem in the magnetorheological fluid transmission process, and can greatly improve the power transmission efficiency.

Description

Technical Field

[0001] The invention relates to a magnetorheological fluid power transmission device, in particular to a non-slip roller magnetorheological stepless power transmission device, belonging to the technical field of mechanical power transmission. Background Art

[0002] A power transmission device is a device used to adjust and transmit power or motion in a mechanical system. Magnetorheological fluid is a typical intelligent material, mainly composed of soft magnetic particles, a base carrier fluid and additives wrapped on the surface of the soft magnetic particles. Under the action of a magnetic field, the shear yield stress of the magnetorheological fluid will change, and the process is reversible. It is suitable for coal mines, fans and other occasions that require stepless speed regulation and high-power transmission. However, the common disc-type roller transmission structure has a serious slip phenomenon during the transmission process, and the overall temperature rise problem of the device is large. It is not suitable for occasions with harsh working conditions such as coal mines. The present invention adopts a new cylindrical roller structure, and the rotation speed of each axial point in the working gap is the same, and there is no slip. Compared with disc rollers and cone rollers, the roller contact area is larger, which can transmit a larger torque, reduce or even eliminate the speed difference, and suppress the heat generation of magnetorheological fluid. The transmission device as a whole is mainly composed of three parts: the active part, the driven part, and the shell. The working space formed between the master and driven rollers is filled with magnetorheological fluid as the transmission medium. At the same time, the controllable solidification characteristics of the magnetorheological fluid are utilized, and different types and layers of excitation coils (circumferential coils, axial coils, radial coils) are installed inside the master / slave roller device. When different currents or levels are passed, the magnetic field thickness of the working gap is changed steplessly, and magnetorheological fluids of different thicknesses can be solidified, thereby realizing stepless changes in the roller transmission ratio. At the same time, radially movable magnetic poles are arranged at both ends of the roller, which can effectively guide the direction of the magnetic circuit and increase the adjustability of the magnetic field thickness. Compared with the disc-type magnetorheological power transmission device, the present invention has the advantages of simple structure, stepless speed regulation, and can eliminate slip to a certain extent, reducing energy waste.

[0003] At present, there are many patents for the research of magnetorheological transmission devices. The Chinese patent "A magnetorheological clutch with multiple excitation coils" (application number: CN201811266803.6) published on January 4, 2019, generates a working magnetic field by energizing multiple excitation coils at the same time, effectively reducing the current stabilization time of the excitation coils and responding quickly; the magnetic field response speed of the working gap of the magnetorheological fluid is fast, which can effectively meet the needs of fast transmission occasions; the master and slave disk groups are both hollow structures, with simple transmission structures and good heat dissipation effects, which can partially solve the problem of heat loss generated during the slip process, but the magnetic field inside the device is messy and uncontrollable, and the transmission ratio cannot be accurately adjusted. The Chinese patent "Planetary magnetorheological transmission device based on shear-extrusion effect" (publication number: CN110925380A) published on December 6, 2019, uses a planetary gear structure to form a closed space. By changing the size of the closed space, the extrusion effect is achieved, which can achieve high torque transmission and uniform transmission. At the same time, the magnetorheological fluid is not affected by centrifugal force, and the torque and speed can be adjusted in real time. Both of the above inventions adopt the traditional magnetorheological fluid transmission structure, that is, the dual transmission form of the coaxial master and slave components. When speed adjustment is performed, the speed difference is inevitable, and the slip heat generation is serious. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a non-slip roller type magnetorheological stepless power transmission device, which not only innovates the transmission structure into a cylindrical transmission structure, but also can effectively reduce or even eliminate the speed difference and inhibit the heat generation of magnetorheological fluid. At the same time, the excitation coil is built into the rotating part, and different types of excitation coils (circumferential coil, axial coil, radial coil) are arranged at different positions inside the rotating part, wherein the circumferential coil is arranged on the inner wall of the drum and wound along the circumference, and an axial magnetic field will be generated in the working gap of the roller; the axial coil is arranged on the inner wall of the drum and wound along the axial direction, and a circumferential magnetic field will be generated in the working gap of the roller; the radial coil will be arranged near the transmission interface of the roller to correct the working gap magnetic field and adjust the uniformity of the magnetic field at different positions. The coil can be wound in multiple layers (i.e., multi-level coils), and current can be passed through each layer respectively. When different currents or levels are passed through, the magnetic field thickness of the working gap will produce stepless changes, and magnetorheological fluids of different thicknesses can be solidified, thereby realizing stepless changes in the transmission ratio of the roller. At the same time, different types and levels of current sources for exciting coils are set separately, and the overall transmission device can flexibly change the magnetic field effect of the working space according to the working conditions, reduce energy consumption, and increase the overall economic and environmental performance of the device. In addition, radially movable magnetic poles are installed at both ends of the drum, which can effectively guide the direction of the magnetic circuit and increase the adjustability of the magnetic field thickness. The shell, end cover, shaft, sealing device, etc. in the device are made of brass, stainless steel and other magnetic isolation materials with superior performance according to the working conditions and cost performance. The drum and magnetic poles are made of electrical pure iron, 20 steel and other materials with good magnetic conductivity to enhance the magnetic field strength of the transmission working space and inhibit the leakage of magnetic lines. The invention can realize stepless speed regulation without slip during the transmission process, effectively solve the heat generation / heat dissipation problem in the magnetorheological fluid transmission process, and can greatly improve the power transmission efficiency.

[0005] In order to achieve the above-mentioned purpose, the non-slip roller type magnetorheological stepless power transmission device comprises an active component mounted on a housing, a driven component mounted in cooperation with the active component, and a fixed component;

[0006] The active component and the driven component form a centrally symmetrical cylindrical roller structure;

[0007] The active component includes an active shaft, an active shaft bearing mounted in cooperation with the active shaft, and an active roller connected and fixed to the active shaft by a key;

[0008] The driven component includes a driven shaft, a driven shaft bearing mounted in cooperation with the driven shaft, and a driven roller connected and fixed to the driven shaft by a key;

[0009] The two ends of the active roller are movably mounted with active roller magnetic poles, and the two ends of the driven roller are movably mounted with driven roller magnetic poles;

[0010] The active roller and the driven roller are respectively provided with an axial exciting coil, a circumferential exciting coil and a radial exciting coil.

[0011] Furthermore, the active roller is divided into two parts, left and right, by a central partition plate, an active roller axial excitation coil is wound along the axial direction on the inner wall of one side of the active roller, and an active roller circumferential excitation coil is wound along the circumferential direction on the inner wall of the other side;

[0012] The driven roller is divided into left and right parts by a central partition plate. An axial excitation coil of the driven roller is axially wound on the inner wall of one side of the driven roller, and a circumferential excitation coil of the driven roller is circumferentially wound on the inner wall of the other side.

[0013] Furthermore, on the inner wall of the active roller, near the transmission interface of the rollers, a first exciting coil installation groove is symmetrically opened with the central partition of the active roller as the center, and a local radial exciting coil of the active roller is installed in the first exciting coil installation groove;

[0014] On the inner wall of the driven roller, near the roller transmission interface, a second exciting coil installation groove is symmetrically opened with the driven roller central partition as the center, and a local radial exciting coil of the driven roller is installed in the second exciting coil installation groove.

[0015] Furthermore, the fixing component includes a housing for mounting the driving component and the driven component, and a driving shaft end cover and a driven shaft end cover respectively mounted on both sides of the driving component and the driven component.

[0016] Furthermore, active shaft sealing devices are provided on both sides of the active roller, and driven shaft sealing devices are provided on both sides of the driven roller. Both the active shaft sealing device and the driven shaft sealing device are skeleton oil seals.

[0017] Compared with the prior art, the present invention innovatively adopts a cylindrical roller structure, and the excitation coil is built into the rotating part. At the same time, different types of excitation coils (circumferential coils, axial coils, radial coils) are arranged at different positions inside the roller. The circumferential coil is arranged on the inner wall of the roller and wound along the circumference, which can generate an axial magnetic field in the working gap of the roller; the axial coil is arranged on the inner wall of the roller and wound along the axial direction, which can generate a circumferential magnetic field in the working gap of the roller; the radial coil will be arranged near the roller transmission interface, which can be used to correct the magnetic field of the roller interface and adjust the uniformity of the magnetic field at different positions. In addition, the coil can be wound in multiple layers (i.e., multi-level coils), and each layer can be respectively connected to current. When different currents or levels are connected, the magnetic field thickness between the roller interfaces will change steplessly, and magnetorheological fluids of different thicknesses can be solidified, thereby realizing stepless changes in the transmission ratio of the roller. At the same time, the current sources of the excitation coils of different types and levels are set separately, and the current size can be adjusted according to the needs, and the working state of each magnetic pole inside the working space is adjusted, so as to achieve the effect of locally adjusting the magnetic field strength of the working space, changing the transmission ratio, and reducing the energy consumption of the overall device. Radially movable magnetic poles are also provided at both ends of the drum, which can effectively guide the direction of the magnetic circuit and increase the adjustability of the magnetic field thickness. In addition, the shell, end cover, shaft, sealing device, etc. in the device are made of brass, stainless steel and other materials with excellent magnetic isolation properties according to the working conditions. The drum and magnetic poles are made of electrical pure iron, 20 steel and other materials with good magnetic conductivity, which enhance the spatial magnetic field strength of the transmission part, inhibit the leakage of magnetic lines of force, and improve the overall transmission efficiency. The present invention can achieve stepless speed regulation without slip, effectively solve the heat generation / heat dissipation problem in the magnetorheological fluid transmission process, and can greatly improve the power transmission efficiency. Finally, the active part and the driven part of this non-slip double-roller magnetorheological stepless power transmission device have the same structure, design, and process, and can be processed in batches, which is economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the main structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the installation of the local radial exciting coil of the active drum in the present invention;

[0020] Figure 3 It is a schematic diagram of the installation of the local radial exciting coil of the driven drum in the present invention;

[0021] In the figure: 1, shell, 2, driving shaft end cover, 3, driving shaft, 4, driving roller, 4-1, excitation coil mounting groove one, 5, axial excitation coil of driving roller, 6, circumferential excitation coil of driving roller, 7, driving shaft bearing, 8, driving shaft sealing device, 9, local radial excitation coil of driving roller, 10, magnetic pole of driving roller, 11, driven roller, 11-1, excitation coil mounting groove two, 12, driven shaft bearing, 13, driven shaft sealing device, 14, circumferential excitation coil of driven roller, 15, axial excitation coil of driven roller, 16, driven shaft end cover, 17, driven shaft, 18, local radial excitation coil of driven roller, 19, magnetic pole of driven roller. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1 As shown, the non-slip roller type magnetorheological stepless power transmission device comprises an active component mounted on a housing 1, a driven component mounted in cooperation with the active component, and a fixed component;

[0024] The active component and the driven component form a centrally symmetrical cylindrical roller structure, and the rotation speeds of the axial points at the working gap of the roller interface are the same, there is no slip, and the roller contact area is large, so a large torque can be transmitted.

[0025] The active component includes an active shaft 3, an active shaft bearing 7 mounted in cooperation with the active shaft 3, and an active roller 4 connected and fixed to the active shaft 3 by a key;

[0026] The driven component includes a driven shaft 17, a driven shaft bearing 12 mounted in cooperation with the driven shaft 17, and a driven roller 11 connected and fixed to the driven shaft 17 by a key;

[0027] The two ends of the active roller 4 are movably mounted with active roller magnetic poles 10, and the two ends of the driven roller 11 are movably mounted with driven roller magnetic poles 19; the magnetic poles are connected to the active / driven rollers by bolts. On the active / driven rollers, threaded holes of the same type are opened at different positions, and the radial movable adjustment of the magnetic poles is achieved by changing the connection position of the magnetic poles with the active / driven rollers. It can effectively guide the direction of the magnetic circuit, increase the adjustability of the magnetic field thickness, and further achieve stepless changes in the transmission ratio of the overall device.

[0028] The active roller 4 and the driven roller 11 are respectively provided with an axial excitation coil, a circumferential excitation coil and a radial excitation coil. The working space formed by the active roller 4 and the driven roller 11 is filled with magnetorheological fluid. The excitation coil is placed inside the rotating part, which further simplifies the overall device volume and reduces the overall cost.

[0029] Furthermore, the active roller 4 is divided into two parts, left and right, by a central partition. An active roller axial excitation coil 5 is axially wound on the inner wall of one side of the active roller 4, and an active roller circumferential excitation coil 6 is circumferentially wound on the inner wall of the other side.

[0030] The driven roller 11 is divided into two parts, left and right, by a central partition. A driven roller axial excitation coil 15 is axially wound on the inner wall of one side of the driven roller 11, and a driven roller circumferential excitation coil 14 is circumferentially wound on the inner wall of the other side.

[0031] The circumferential exciting coil can generate an axial magnetic field in the working gap between the rollers, and the axial exciting coil can generate a circumferential magnetic field in the working gap between the rollers.

[0032] Further, if Figure 2 As shown, on the inner wall of the active roller 4, near the roller transmission interface, an exciting coil installation groove 4-1 is symmetrically opened with the central partition of the active roller 4 as the center, and the local radial exciting coil 9 of the active roller is installed in the exciting coil installation groove 4-1;

[0033] like Figure 3 As shown, on the inner wall of the driven roller 11, near the roller transmission interface, an excitation coil mounting groove 11-1 is symmetrically opened with the center partition of the driven roller 11 as the center, and a driven roller local radial excitation coil 18 is installed in the excitation coil mounting groove 11-1.

[0034] The excitation coil installation grooves are evenly opened along the circumference of the cylinder wall, and the radial excitation coils can be well embedded in the excitation coil installation grooves. The specific number of the excitation coil installation grooves and the corresponding radial excitation coils can be adjusted according to the working conditions and transmission requirements. The main function of the radial excitation coil is to improve the overall magnetic field effect by adjusting the radial magnetic field current when the local magnetic field in the working space is detected to be uneven. It can be used to correct the magnetic field on the roller interface, adjust the uniformity of the magnetic field at different positions, enhance the transmission performance, and reduce energy consumption.

[0035] The above-mentioned axial coils, circumferential coils and radial coils can all be wound in multiple layers (i.e., multi-level coils), and current can be passed through each layer. When different currents or levels are passed through, the magnetic field thickness of the working gap will change steplessly, and magnetorheological fluids of different thicknesses can be solidified, thereby realizing stepless changes in the roller transmission ratio and stepless speed regulation without slip, effectively solving the heat generation / heat dissipation problem in the magnetorheological fluid transmission process, and at the same time greatly improving the power transmission efficiency. Current sources of different types and levels of excitation coils are independently set, and each coil is connected to an independently controlled programmable current source, and can adjust the size of the programmable current source and the working state of each magnetic pole inside the working space according to needs, so as to achieve the effect of locally adjusting the working magnetic field strength, changing the transmission ratio, and reducing the energy consumption of the overall device.

[0036] Furthermore, the fixing component includes a housing 1 for mounting the driving component and the driven component, and a driving shaft end cover 2 and a driven shaft end cover 16 respectively mounted on both sides of the driving component and the driven component.

[0037] Furthermore, active shaft sealing devices 8 are provided on both sides of the active roller 4, and driven shaft sealing devices 13 are provided on both sides of the driven roller 11. Both the active shaft sealing devices 8 and the driven shaft sealing devices 13 are skeleton oil seals.

[0038] The axial position of the driving shaft bearing 7 is determined by the driving shaft end cover 2 and the driving shaft sealing device 8; the axial position of the driven shaft bearing 12 is determined by the driven shaft end cover 16 and the driven shaft sealing device 13. During the overall transmission process of the device, due to the influence of factors such as external loads, the bearing will move in the axial position. To prevent such a situation, the end cover and the sealing device are used to fix the axial position of the bearing, reduce the damage to the bearing, and increase the service life of the bearing.

[0039] The housing 1, the master / slave shaft end cover, the master / slave shaft bearing, and the master / slave shaft sealing device in the device can be made of superior brass, stainless steel and other magnetic isolation materials according to working conditions and cost-effectiveness, so as to suppress the overflow of magnetic lines during operation and enhance the overall transmission performance of the device;

[0040] The two rollers and the corresponding magnetic poles in the device can be made of materials with good magnetic conductivity such as electrical pure iron and 20 steel according to working conditions and cost performance, which can more effectively guide the direction of the magnetic circuit, enhance the magnetic field strength in the transmission space, and improve the transmission power;

[0041] The active component and the driven component have the same structure, design and process as each component, and can be processed in batches, which is economical.

[0042] In summary, the present invention innovatively adopts a cylindrical roller structure, and the excitation coil is built into the rotating part, which simplifies the overall device volume and reduces the cost. At the same time, different types of excitation coils (circumferential coils, axial coils, radial coils) are arranged at different positions inside the roller. The circumferential coil is arranged on the inner wall of the roller and wound along the circumference, which can generate an axial magnetic field in the working gap of the roller; the axial coil is arranged on the inner wall of the roller and wound along the axial direction, which can generate a circumferential magnetic field in the working gap of the roller; the radial coil will be arranged near the roller transmission interface, which can be used to correct the magnetic field of the roller interface and adjust the uniformity of the magnetic field at different positions. In addition, the coil can be wound in multiple layers (i.e., multi-level coils), and each layer can be respectively passed through current. When different currents or levels are passed through, the magnetic field thickness between the roller interfaces will produce stepless changes, and magnetorheological fluids of different thicknesses can be solidified, thereby realizing stepless changes in the roller transmission ratio, realizing stepless speed regulation without slip, effectively solving the heat generation / heat dissipation problem in the magnetorheological fluid transmission process, and greatly improving the power transmission efficiency. At the same time, different types and levels of excitation coil current sources are set separately, and the current size can be adjusted according to the needs, and the various magnetic poles inside the working space can be changed, so as to achieve the effect of locally adjusting the working magnetic field strength, changing the transmission ratio, and reducing the energy consumption of the overall device. In addition, the magnetic conductive poles that can move radially are set at the working state of both ends of the roller, which can effectively guide the direction of the magnetic circuit, increase the adjustability of the magnetic field thickness, and further enhance the stepless change of the transmission ratio of the overall device. The shell, end cover, shaft, sealing device, etc. in the device are respectively made of brass, stainless steel and other magnetic isolation materials with superior performance according to the working conditions and cost performance. The roller and magnetic conductive poles are made of electrical pure iron, 20 steel and other materials with good magnetic conductivity, so as to enhance the magnetic field strength of the transmission working space and inhibit the leakage of magnetic lines. Finally, the active part and the driven part of the non-slip differential magnetorheological stepless power transmission device have the same structure, design and process, which can be processed in batches, and the processing is convenient, which can enhance the economy of the overall device.

Claims

1. A non-slip roller type magnetorheological continuously variable power transmission device, comprising an active component mounted on a housing (1), a driven component mounted in cooperation with the active component, and a fixed component; characterized in that: The active component and the driven component form a centrally symmetrical cylindrical roller structure; The active component comprises an active shaft (3), an active shaft bearing (7) mounted in cooperation with the active shaft (3), and an active roller (4) connected and fixed to the active shaft (3) via a key; The driven component comprises a driven shaft (17), a driven shaft bearing (12) mounted in cooperation with the driven shaft (17), and a driven roller (11) connected and fixed to the driven shaft (17) via a key; Active roller magnetic conductive poles (10) are movably mounted at both ends of the active roller (4), and driven roller magnetic conductive poles (19) are movably mounted at both ends of the driven roller (11); The active roller (4) and the driven roller (11) are respectively provided with an axial excitation coil, a circumferential excitation coil and a radial excitation coil; On the inner wall of the active roller (4), near the roller transmission interface, an exciting coil installation groove (4-1) is symmetrically provided with the central partition of the active roller (4) as the center, and a local radial exciting coil (9) of the active roller is installed in the exciting coil installation groove (4-1); On the inner wall of the driven roller (11), near the roller transmission interface, a second exciting coil installation groove (11-1) is symmetrically provided with the central partition of the driven roller (11) as the center, and a local radial exciting coil (18) of the driven roller is installed in the second exciting coil installation groove (11-1); The fixed component comprises a housing (1) for mounting the active and passive components, and an active shaft end cover (2) and a passive shaft end cover (16) respectively mounted on both sides of the active and passive components.

2. The non-slip roller type magnetorheological continuously variable power transmission device according to claim 1, characterized in that: The active roller (4) is divided into left and right parts by a central partition plate, an active roller axial excitation coil (5) is axially wound on the inner wall of one side of the active roller (4), and an active roller circumferential excitation coil (6) is circumferentially wound on the inner wall of the other side; The driven roller (11) is divided into two parts, left and right, by a central partition. A driven roller axial excitation coil (15) is axially wound on the inner wall of one side of the driven roller (11), and a driven roller circumferential excitation coil (14) is circumferentially wound on the inner wall of the other side.

3. The non-slip roller magnetorheological continuously variable power transmission device according to claim 1, characterized in that: Active shaft sealing devices (8) are provided on both sides of the active roller (4), and driven shaft sealing devices (13) are provided on both sides of the driven roller (11). Both the active shaft sealing device (8) and the driven shaft sealing device (13) are skeleton oil seals.

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