CN104565120B - A kind of magnetic flow liquid becomes torquer - Google Patents

Abstract

The invention discloses a magneto-rheological fluid torque device, which belongs to the technical field of mechanical power transmission. The excitation coil (12) is installed in the groove formed by the left-rotary magnetic-conductive plate (1) and the right-rotary magnetic-conductive plate (9); The plate (9), the exciting coil (12) and the transmission plate (8) constitute a single-disk transmission structure in series, and are fixedly connected through the connecting ring (10); the transmission plate (8) and the left-rotating magnetic plate (1 ) and the right-rotating magnetic guide plate (9) are filled with a magneto-rheological fluid transmission medium, and there is an air flow gap between each transmission structure, forming an array air-cooled transmission structure. The magnetorheological fluid torque device has large transmission torque, significantly improved heat dissipation effect, and small radial dimension, which is suitable for large torque power transmission occasions that require radial dimension; the transmission structure does not need cooling water, and adopts self-winding Cooling and heat dissipation, it can be used in occasions where water cooling cannot be used.

Description

A magneto-rheological fluid torque device

technical field

The invention relates to a magnetorheological fluid device, in particular to a magnetorheological fluid torque device, which belongs to the technical field of mechanical power transmission.

Background technique

Magnetorheological Fluids (MRF) is a typical intelligent material, which is mainly composed of soft magnetic particles, carrier fluid and additives wrapped on the surface of soft magnetic particles. The viscosity of magnetorheological fluid has the characteristic of controlling the magnetic field. The basic feature is: under the action of an external magnetic field, the particles in the magnetorheological fluid form fiber-like chains along the direction of the magnetic field, which hinders the free flow of the base carrier fluid and makes the magnetorheological fluid change from a Newtonian fluid to one with a certain shear. The viscoplastic fluid with strong force undergoes a strong "solidification" phenomenon; and when the external magnetic field disappears, the magnetorheological fluid returns to a free-flowing state (liquid state). When the magnetorheological fluid is under the action of a certain external magnetic field, its viscoplasticity and other properties will change, which is called the magnetorheological effect. In the 1990s, a breakthrough was made in the preparation technology of magnetorheological fluid, and the research on applied technology began to rise, making its application develop rapidly. It has been used in dampers, shock absorbers, variable torque devices (clutches, brakes, etc.), polishing devices, Composite components and other fields have been widely used and have broad application prospects. Among them, the magnetorheological fluid torque device is a new type of power transmission technology developed with magnetorheological fluid as the transmission medium. The magnetorheological fluid torque device is divided into two parts, the master and the slave, and the master and slave parts are filled with magnetic flow. The variable fluid transmission medium changes the viscosity of the magnetorheological fluid by changing the magnetic field strength of the magnetorheological fluid, so as to realize the stepless control of the torque between the master and slave parts; compared with the traditional torque variable device, it has a small volume , low energy consumption, small wear, low noise and fast response.

At present, there are many patents related to magnetorheological fluid torque devices, such as: the Chinese patent "radial self-pressurized magnetorheological fluid clutch" (application number: 00104451.6) published on January 16, 2002. The heat dissipation problem is not considered in the clutch, and the heat dissipation effect is poor. The Chinese patent "Magneto-rheological stepless transmission" (application number: 201010121882.9) published on August 4, 2010, the magneto-rheological clutch transmits torque in the way of repeated superimposition of multiple discs. Although it can transmit large torque, it uses multiple Disk continuous superimposition method, the heat dissipation effect is poor. The Chinese patent "A water-cooled magnetorheological soft starter" (application number: 201110334597.X) published on February 22, 2012, uses water cooling to dissipate heat, but the water cooling channel is likely to cause an increase in the magnetic resistance of the magnetic circuit , reduces the transmission torque and requires a large amount of cooling water, which cannot be used in water-deficient occasions, and the structure is bulky.

Contents of the invention

Aiming at the problems existing in the above-mentioned prior art, the present invention provides a magneto-rheological liquid variable torque device, which has a small radial size and a large transmission torque; significantly improves the heat dissipation effect, and is suitable for large-torque air-cooled transmissions that require a radial size occasion.

In order to achieve the above purpose, the magnetorheological fluid torque device includes an active part installed on the bearing seat, and a driven part cooperating with the active part, and the drive part is filled with a magnetorheological fluid transmission medium;

The active components include the drive shaft, the left-rotating magnetic guide plate, the right-rotating magnetic guide plate, the connecting ring and the excitation coil;

The driven part includes a driven shaft, a transmission disk, a wide sleeve and a narrow sleeve, the transmission disk is fixed on the driven shaft through a spline, and the wide sleeve is fitted on the driven shaft to connect each transmission disk sequentially separated;

The excitation coil is installed in the groove formed by the left-rotating magnetic conducting plate and the right-rotating magnetic conducting plate;

A single-disc transmission structure composed of a plurality of left-rotating magnetic guide plates, right-rotating magnetic guide plates, excitation coils and transmission discs is connected in series and fixedly connected through the connecting ring;

The gap between the transmission plate and the left-rotation magnetic guide plate and the right-rotation magnetic guide plate is filled with magnetorheological fluid transmission medium, and there is an air flow gap between each transmission structure, forming an array air-cooled transmission structure.

Further, a narrow sleeve is fixedly installed on the driven shaft by screws.

Further, the gap between the transmission disc and the left-rotating magnetic-conducting plate and the right-rotating magnetic-conducting plate is sealed by a sealing ring.

Further, thermal expansion holes are provided on the left-rotating magnetic conducting plate and the right-rotating magnetic conducting plate located at both ends.

Compared with the existing technology, the magnetorheological fluid torque device adopts a single-disc axial array transmission structure, and multiple single-disc transmission structures are connected in series, and there is an air flow gap between the single-disk structures, so that the transmission torque is large and the heat dissipation is large. The effect has been significantly improved, and the radial dimension is small, which is suitable for large-torque power transmission occasions that require radial dimension; in addition, the transmission structure does not need cooling water, and adopts self-air cooling to dissipate heat, which can be used in applications that cannot be cooled by water flow occasion.

Description of drawings

Fig. 1 is a schematic diagram of the main structure of the present invention;

In the figure: 1. Left-rotating magnetic guide plate, 2. Driven shaft, 3. Driving shaft, 4. Collector ring, 5. Sealing ring, 6. Bearing seat, 7. Thermal expansion hole, 8. Transmission disc, 9. Right rotation magnetic guide plate, 10, connecting ring, 11, wide sleeve, 12, excitation coil, 13, narrow sleeve, 14, end cap.

detailed description

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

As shown in Figure 1, the magneto-rheological fluid torque device includes an active part installed on the bearing housing 6, and a driven part cooperating with the active part, and the drive part is filled with magnetorheological fluid to drive medium;

The active component includes a drive shaft 3, a left-rotating magnetic plate 1, a right-rotating magnetic plate 9, a connecting ring 10 and an excitation coil 12;

The driven part includes a driven shaft 2, a transmission disc 8, a wide sleeve 11 and a narrow sleeve 13, the transmission disc 8 is fixed on the driven shaft 2 by a spline, and the wide sleeve 11 is sleeved on the driven shaft. Each drive disc 8 is sequentially separated on the moving shaft 2;

The excitation coil 12 is installed in the groove formed by the left-rotary magnetic-conductive plate 1 and the right-rotary magnetic-conductive plate 9;

A single-disc transmission structure composed of a plurality of left-rotating magnetic-conducting plates 1, right-rotating magnetic-conducting plates 9, excitation coils 12 and transmission discs 8 is connected in series and fixedly connected through the connecting ring 10;

The gap between the transmission plate 8 and the left-rotation magnetic guide plate 1 and the right-rotation magnetic guide plate 9 is filled with magnetorheological fluid transmission medium, and there is an air flow gap between each transmission structure, forming an array air-cooled transmission structure. The radial size is small, the transmission torque is large, and the heat dissipation effect is good.

When the excitation coil 12 is energized through the collector ring 4, a variable magnetic field can be generated in the working gap of the magnetorheological fluid. The moving parts rotate to realize the transmission of different torques. According to the requirements of transmission power, the number of series magnetic circuits can be increased or decreased arbitrarily.

Further, a narrow sleeve 13 is fixedly installed on the driven shaft 2 by screws. To prevent transmission disc 8 from moving left and right.

Further, the gap between the transmission disk 8 and the left-rotating magnetic-conducting plate 1 and the right-rotating magnetic-conducting plate 9 is sealed by a sealing ring 5 .

Further, thermal expansion holes 7 are provided on the left-rotating magnetic conducting plate 1 and the right-rotating magnetic conducting plate 9 located at both ends. When the array magnetorheological fluid torque device is in working state, the magnetorheological fluid in the working gap is subjected to friction to generate heat, the temperature rises, the volume of the magnetorheological fluid expands, and the magnetorheological fluid passes through the thermal expansion hole to generate heat. Counteract the heated volume expansion of magnetorheological fluid and prevent the leakage of magnetorheological fluid.

In summary, the magnetorheological fluid torque device adopts a single-disk axial array transmission structure, and multiple single-disc transmission structures are connected in series, and there is an air flow gap between the single-disk structures, so that the transmission torque is large and the heat dissipation effect is improved. It is significantly improved, and the radial dimension is small, which is suitable for large-torque power transmission occasions that require radial dimension; in addition, the transmission structure does not need cooling water, and uses self-air cooling to dissipate heat, which can be used in occasions where water cooling cannot be used.

Claims (4)

1. A magneto-rheological fluid torque device, comprising an active part installed on the bearing seat (6), and a driven part cooperating with the active part installed; The active component includes a drive shaft (3), a left-rotating magnetically conductive plate (1), a right-rotating magnetically conductive plate (9), a connecting ring (10) and an excitation coil (12); The driven part includes a driven shaft (2), a transmission disc (8), a wide sleeve (11) and a narrow sleeve (13), and the transmission disc (8) is fixed on the driven shaft (2) by a spline , the wide sleeve (11) is set on the driven shaft (2) to separate each drive disc (8) in sequence; It is characterized in that the excitation coil (12) is installed in the groove formed by the left-rotation magnetic guide plate (1) and the right-rotation magnetic guide plate (9); The single-disc transmission structure composed of a plurality of left-rotary magnetic guide plates (1), right-rotary magnetic guide plates (9), excitation coils (12) and transmission discs (8) is connected in series, and through the connecting ring (10) Fixed connection, there is an air flow gap between each single disc transmission structure, forming an array air-cooled transmission structure; The gap between the transmission disc (8) and the left-rotating magnetic-conducting plate (1) and the right-rotating magnetic-conducting plate (9) is filled with a magnetorheological fluid transmission medium. 2. A magneto-rheological fluid torque device according to claim 1, characterized in that, A narrow sleeve (13) is fixedly installed on the driven shaft (2) by screws. 3. A magneto-rheological fluid torque device according to claim 1, characterized in that, The gaps between the drive discs (8) at both ends, the left-rotating magnetic-conducting plate (1) and the right-rotating magnetic-conducting plate (9) are sealed by sealing rings (5). 4. A magneto-rheological fluid torque device according to claim 1, characterized in that, Thermal expansion holes (7) are provided on the left-rotating magnetic conducting plate (1) and the right-rotating magnetic conducting plate (9) located at both ends.