CN110500366A - A magneto-rheological fluid clutch with airbag pressurization - Google Patents

Abstract

The invention discloses a magneto-rheological fluid clutch with air bag pressurization, which mainly includes an input end, an output end, a magneto-rheological fluid, an exciting coil, a casing and the like. The input end is mainly composed of input shaft, driving piece, air bag, etc.; the output end is mainly composed of output shaft, driven piece, etc.; a number of air bags with anisotropic materials are installed between the driving pieces. The excitation coil is energized to generate a magnetic field to change the viscosity of the magnetorheological fluid until it becomes solid-like, and the generated torque is transmitted to the output shaft through the input shaft, active piece, magnetorheological fluid, and driven piece; the airbag is inflated through an external device Squeeze the magnetorheological fluid to improve the transmission torque and shorten the response time.

Description

A magneto-rheological fluid clutch with airbag pressurization

technical field

The invention relates to a magneto-rheological fluid clutch, in particular to a twist-increasing magnetorheological fluid clutch in which the magnetorheological fluid works in a squeeze-shear mode.

Background technique

Magnetorheological fluid is a new type of intelligent material composed of micron-scale magnetic particles, surfactants and solvents. Under the action of a magnetic field, its yield stress and viscosity will change with the change of the applied magnetic field, and the response speed is fast. . Based on these special mechanical properties, magnetorheological fluids have very broad application prospects in the fields of mechanical engineering, automotive engineering, control engineering, precision instrument processing, and aerospace.

The magnetorheological fluid clutch is an important field of magnetorheological fluid application. According to the properties of the magnetorheological fluid, the external magnetic field can be controlled to realize the separation and combination of the clutch. Under the action of different magnetic field strengths, the shear of the magnetorheological fluid The shear stress changes, and then realizes the change of speed and torque, and can realize stepless control. Compared with the traditional clutch, magnetorheological fluid has the advantages of no wear, low power consumption, low noise, short response time, simple structure and simple control. According to the structure of the magnetorheological fluid clutch, it is generally divided into a cylindrical magnetorheological fluid clutch, a disc magnetorheological fluid clutch and a cup magnetorheological fluid clutch. Invention patent CN102562857A discloses "a conical squeeze-shear type magneto-rheological fluid clutch", which utilizes the force of the armature under the action of a magnetic field. When there is current in the excitation coil, the armature will be attracted and squeezed Magneto-rheological fluid. At this time, the magnetorheological fluid works in the squeeze-shear mode, which can greatly increase the output torque. The disadvantages are that the structure is complex and the working noise is large. Invention patent CN106884898A discloses "a squeeze-type torque-increasing magneto-rheological fluid clutch". A number of steel balls arranged radially on the output sleeve squeeze the magnetorheological fluid under the action of centrifugal force. At the same time, the piston is moved under the action of electromagnetic attraction, and under the combined extrusion of the steel ball and the piston, the torque is increased, the transmission efficiency is improved, and a quick response is realized. The disadvantage is that the pressure provided by the steel ball is limited. At the same time, the magneto-rheological fluid clutch also has the problem that the transmission torque is not large enough, which restricts the development and application of the magneto-rheological fluid clutch, so how to improve the transmission torque of the magneto-rheological fluid clutch has become a constraint for the magneto-rheological fluid clutch. Key to clutch development.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a magneto-rheological fluid clutch with air bag pressurization, which squeezes the magneto-rheological fluid through the air bag to make the magneto-rheological fluid work in the squeeze-shear mode, It has the advantages of improving the transmission torque, simple structure, quick response and high transmission efficiency.

A magneto-rheological fluid clutch with air bag pressurization according to the present invention specifically includes an input shaft, a sealing ring I, a bearing I, an input shaft end cover, a bearing II, an air bag, an input end housing, an excitation coil, a coil housing, an output End housing, bolts, driven plate, active plate, bearing III, output shaft, sealing ring II, bearing IV, active plate magnetic isolation ring, driven plate magnetic isolation ring, magnetorheological fluid, air intake channel, etc. The active pieces are installed on the input shaft through splines, and the distance between the active pieces is maintained by the active piece magnetic isolation ring. The space formed by the input shaft housing, the output shaft housing and the exciting coil housing is used for placing the exciting coil. The driven pieces are connected by bolts, and there is a magnetic isolation ring for the driven pieces to maintain the distance between the driven pieces. The connection is simple and reliable, and the distances are consistent. The output shaft and the driven pieces are connected by bolts.

As a further improvement of the present invention, several airbags are fixedly connected to the input shaft, and the airbags are connected to external devices through the input shaft air intake channel. The direction is deformed.

As a further improvement of the present invention, the torque is transmitted between the output shaft and the driven plate through bolt connection, which has a simple structure and reliable performance.

As a further improvement of the present invention, the distance between the driven plates and the distance between the active plates can be adjusted arbitrarily, and the range is between 0.5mm-3mm.

Beneficial effects of the present invention: (1) The present invention expands the volume of the air bag installed on the shaft under the action of external equipment, squeezes the magnetorheological fluid, and makes the magnetorheological fluid work in the squeeze-shear mode, It can improve the transmission torque and shorten the response time; (2) The driven pieces are connected by bolts, and there is a magnetic isolation ring for the driven pieces to maintain the distance between the driven pieces, the distance adjustment is convenient, and the connection is simple and reliable.

Description of drawings

Fig. 1 is a schematic structural diagram of a magneto-rheological fluid clutch with air bag pressurization of the present invention;

Fig. 2 is a partial sectional view of the air bag of a magneto-rheological fluid clutch with air bag pressurization according to the present invention;

Fig. 3 is the active plate of a magneto-rheological fluid clutch with air bag pressurization according to the present invention;

Fig. 4 is a driven plate of a magneto-rheological fluid clutch with air bag pressurization according to the present invention;

1-input shaft; 2-sealing ring Ⅰ; 3-bearing Ⅰ; 4-input shaft end cover; 5-bearing Ⅱ; 6-airbag; 7-input end housing; 8-excitation coil; 10-output shell; 11-bolt; 12-driven plate; 13-active plate; 14-bearing III; 15-output shaft; 16-seal ring II; 17-bearing IV; ; 19-magnetic spacer ring for driven piece; 20-magnetorheological fluid; 21-intake channel; 22-spline.

Specific implementation method

Below in conjunction with accompanying drawing and specific embodiment the present invention is further described:

As shown in Figure 1, a magneto-rheological fluid clutch with air bag pressurization according to the present invention specifically includes an input shaft 1, a sealing ring I2, a bearing I3, an input shaft end cover 4, a bearing II5, an air bag 6, and an input end shell Body 7, excitation coil 8, coil casing 9, output end housing 10, bolt 11, driven piece 12, driving piece 13, bearing III14, output shaft 15, sealing ring II16, bearing IV17, driving piece magnetic isolation ring 18, The driven plate is separated from the magnetic ring 19, the magneto-rheological fluid 20, the air intake channel 21, the spline 22, and the like. The input shaft 1 cooperates with the bearing I3, the input shaft end cover 4 and the input shaft housing 7, and the input shaft end cover 4 and the input end housing 7 are connected by bolts; several airbags 6 are fixedly connected to the input shaft 1, and the airbags 6 pass through The air intake passage 21 of the input shaft 1 is connected with an external device; the active plate 13 and the input shaft 1 are connected by a spline 22; the input end housing 7, the output end housing 10 and the coil housing 9 are connected by bolts; The active sheet 13 and the driven sheet 12 are distributed alternately, and an air bag 6 is installed between the two active sheets 12; the active sheet magnetic isolation ring 18 is arranged between the active sheet 12 to keep the distance, and the driven sheet 12 is provided with a slave The moving piece is separated from the magnetic ring 19 to maintain a distance, which can be adjusted arbitrarily, and the range is between 0.5mm-3mm; the excitation coil 8 is installed in the space formed by the input end housing 7, the output end housing 10 and the coil housing 9 ;Use the bolt 11 to connect the driven piece 12 and the output shaft 15; the output shaft 15 cooperates with the output end housing 10 through the bearing III14; the driven piece 12 cooperates with the input shaft 2 through the bearing II5; the input shaft 1 and the input shaft end cover 4. A sealing ring is provided between the output shaft 15 and the output shaft housing 10 .

As shown in Figure 2, a partial cross-sectional view of the input shaft 1 of the magneto-rheological fluid clutch with air bag pressurization of the present invention where the air bag 6 is installed, several air bags 6 are fixed in the radial direction of the input shaft 1, and the air bag 6 passes through The air intake channel 21 is connected to the external pipeline, and the airbag is made of anisotropic material, and the inflation is mainly deformed along the circumferential direction, as indicated by the arrow in the figure. There is also a spline 22 on the drive shaft 1 for installing the drive plate 13 .

During the working process of the magneto-rheological fluid clutch, the input shaft 1 rotates, and the external equipment delivers gas to the airbag 6 through the input shaft inlet channel 21, and the volume of the airbag 6 increases. Since the airbag 6 is made of anisotropic material, The airbag will deform along the circumferential direction and the radial direction, and generate a certain pressure on the magneto-rheological fluid 20, so that the magnetorheological fluid 20 works in the extrusion mode, and electrifying the excitation coil 8 will generate a magnetic field to act on the magneto-rheological fluid 20 in the clutch. The rheological fluid 20, due to the inherent properties of the magnetorheological fluid 20, will change from Newtonian fluid to Bingham fluid, from liquid-like to solid-like, and the magnetorheological fluid works in the squeeze-shear mode, which can produce Torque is transmitted due to larger yield stress, and the response time is short; the present invention has designed many pairs of driving plates 13 and driven plates 12, which can further enhance the torque, and as the current in the exciting coil 8 increases, the transmitted Torque rises. The torque is transmitted to the output shaft 15 through the input shaft 1 , the driving plate 13 , the magneto-rheological fluid 20 , and the driven plate 12 . When the excitation coil 8 is powered off, the magnetorheological fluid changes from solid-like to liquid-like, the transmission torque decreases, the output shaft 15 stops rotating, and at the same time, the external equipment stops delivering gas to the airbag 6, the volume of the airbag 6 decreases, and the recovery original shape. By controlling the current of the excitation coil 8 and cooperating with external devices, the magneto-rheological fluid clutch can realize the purpose of transmitting torque and boosting torque.

The above-mentioned embodiments are preferred implementations of the present invention, and are not limited to the above-mentioned implementations. Without departing from the essence of the present invention, any obvious improvement, replacement or modification shall belong to the protection scope of the present invention.

Claims (4)

1. The present invention is a magneto-rheological fluid clutch with air bag pressurization, which is characterized in that it includes an input shaft (1), a sealing ring I (2), a bearing I (3), an input shaft end cover (4), Bearing II (5), air bag (6), input housing (7), excitation coil (8), coil housing (9), output housing (10), bolts (11), driven plate (12) , driving plate (13), bearing III (14), output shaft (15), seal ring II (16), bearing IV (17), driving plate magnetic isolation ring (18), driven plate magnetic isolation ring (19) , magnetorheological fluid (20), air intake channel (21), spline (22); on the input shaft (1) of the input end, several airbags (6) are fixedly connected, and the airbags (6) are located on two active between the plates (13), and through the input shaft (1) air intake channel, and connected with the external device; at the output end, use bolts (11) to connect the driven plate (12) and the output shaft (15); A driven piece magnetic spacer (19) is arranged between the driven pieces (12) to keep the distance between the driven pieces. 2. A magneto-rheological fluid clutch with airbag supercharging according to claim 1, characterized in that: anisotropic materials are used in the airbag (6), and when inflated, gas flow occurs along the circumferential direction and the radial direction. deformation. 3. A magneto-rheological fluid clutch with airbag pressurization according to claim 1, characterized in that: said input end, between the active plates (13) is provided with an active plate magnetic isolation ring (18), To keep the distance between active sheet (13). 4. A magneto-rheological fluid clutch with airbag pressurization according to claim 1, characterized in that: the distance between the driven plates (12) and the distance between the driving plates (13) The distance can be adjusted arbitrarily, and the range is between 0.5mm-3mm.