CN202597631U - Magneto-rheological hydraulic control planetary transmission device - Google Patents

Abstract

The utility model discloses a magneto-rheological hydraulic control planetary transmission device which comprises a magneto-rheological transmission device and a differential planetary gear transmission device. The magneto-rheological transmission device and the composite differential planetary gear transmission device are organically combined, not only is the defect that the magneto-rheological control device only can transfer small torque overcome, but also the defects that the planetary gear transmission device can not absorb impacts and vibrations and can not realize stepless speed regulation are overcome. The control of large torque through small torque is realized, so that stepless speed regulation and soft starting can be realized, large torque can also be transferred, impacts and vibrations from a prime motor and a load can be absorbed, and the device can always operate stably and efficiently.

Description

Magneto-rheological hydraulically controlled planetary transmission

technical field

The invention belongs to the field of continuously variable transmissions, in particular to a magneto-rheological liquid-controlled planetary transmission device. the

Background technique

Power machinery generally needs a special soft-start device when starting to avoid excessive load and required power during the start-up process and achieve a smooth start. However, the existing soft-start devices have their own defects. the

The friction clutch has the advantages of compact structure, reliable operation, smooth engagement, etc. It is easy to realize soft start, but it has the disadvantages of easy wear of the friction plate, no long-term slip operation, easy heat generation, and slow response speed. It is generally used in low-speed working conditions. Down. the

At present, the electrical soft starter generally uses a soft starter, which can realize the smooth start of the motor, but it cannot be used in a transmission system that requires a large torque from the beginning. the

Although hydraulic transmission devices have the advantages of high transmission efficiency, reliable performance, easy control, and ability to realize stepless speed change, the disadvantages are that the hydraulic system has a large structure, expensive cost, and difficult maintenance. the

The hydraulic transmission device can realize on-load starting and a wide range of variable torque speed regulation, but it has disadvantages such as huge energy loss caused by the impact of liquid molecules on each other, and the torque conversion coefficient cannot be changed after setting. the

At present, regardless of whether it is a mechanical or electrical soft starter, the torque is generally only adjusted during the startup process to achieve a smooth start of the device. However, during the transmission process, when the load changes, the torque and speed cannot be adjusted in real time. to accommodate changes in load. the

Currently more advanced is the magneto-rheological soft-starter; Chinese patent CN101029664A discloses a magneto-rheological soft-starter, which has a simple structure and high heat dissipation efficiency. The service life is long, but the transmission torque is low. The Chinese patent CN1295453C has announced a magneto-rheological stepless transmission. The device adopts a V-shaped working gap. big. Chinese patent CN2575371Y discloses a double-cone disc type magneto-rheological transmission device. The device has good dynamic quality but the torque that can be transmitted is not very large. the

Contents of the invention

The object of the present invention is to provide a magneto-rheological fluid-controlled planetary transmission device capable of stable start, large transmission torque, stepless speed change and torque change, and long service life. the

The technical solution that realizes the object of the present invention is:

A magneto-rheological liquid-controlled planetary transmission device, including a magneto-rheological transmission device and a differential planetary gear transmission device, wherein the left casing, the right casing, and the fixed frame form the casing of the entire device, and the drive shaft is connected to the The distance between the inner friction plates connected to the inner friction plates is determined by the inner cage and is axially positioned by it; the distance between the outer friction plates is determined by the outer cage and is axially positioned by it; the driven shaft and the absolute magnet The rings are connected by bolts, and they constitute the cavity of the entire magnetorheological fluid control device. The magnetic-absolute ring is fixed on the driven shaft by bolts, and the cavity between the inner and outer friction plates, that is, the magnetorheological control device, is filled with magnetorheological fluid. The coil is wound in the left casing, the lead wire of the coil is led out through the conduit, the magneto-rheological fluid is sealed by the felt ring, the driven shaft is connected with the inner ring gear of the first-stage planetary differential gear train by bolts, and the driving shaft is also the first-stage planetary differential gear train. The sun gear, ring gear, planetary gear, planetary carrier, and driving shaft of the first-stage differential planetary gear train constitute the first-stage planetary differential gear train, thereby realizing differential input, and the planetary carrier of the first-stage differential planetary gear train It is connected with the connecting shaft through a key; the planet carrier, connecting shaft, planetary gear and ring gear constitute the second-stage planetary gear train, the ring gear is fixed on the casing by bolts, the planet carrier is supported on the right casing through bearings, and the planet carrier The right half and the output shaft are integrated and supported on the right casing by bearings. The power is input from the driving shaft and output through the output shaft. the

The magneto-rheological liquid-controlled planetary transmission mechanism has two ways of power transmission, one is through the motor to directly drive the driving shaft to rotate, that is, the sun gear of the first-stage planetary differential gear system rotates, and the other is through the driving shaft through The magnetorheological fluid drives the driven shaft on the control device to rotate, thereby driving the ring gear of the first-stage planetary gear train to rotate, thereby realizing differential input, which is achieved by changing the current of the excitation coil, thereby changing the viscosity of the magnetorheological fluid Control the load speed and torque. the

The planetary transmission mechanism adopts the method of differential planetary gears in series, the ring gear and the sun gear of the first-stage planetary gear train are used as differential inputs, and the planetary carrier of the planetary gear train of the first-stage planetary gear train and the planetary gear of the second-stage planetary train The sun gear of the gear train is connected by a key, and the planet carrier of the second-stage planetary gear train is connected to the output shaft to realize power transmission. the

The inner friction plate is connected with the driving shaft through a spline. the

Compared with the prior art, the present invention has significant advantages:

The present invention introduces a compound differential planetary transmission device and organically combines the magneto-rheological control device with the planetary transmission device, which not only overcomes the shortcoming that the magnetorheological control device can only transmit relatively small torque, but also overcomes the fact that the planetary gear transmission device cannot absorb The shortcomings of shock, vibration and inability to realize stepless speed regulation, realize the control of small torque to large torque, so that the present invention can not only realize stepless speed regulation and soft start, but also transmit relatively large torque and absorb torque from the prime mover and Shock and vibration of the load, and make the device run stably and efficiently all the time. the

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

Description of drawings

Figure 1 is a schematic diagram of a magneto-rheological hydraulically controlled planetary transmission. the

Fig. 2 is a structural diagram of a magneto-rheological hydraulically controlled planetary transmission device. the

Fig. 3 is a control schematic diagram of a magneto-rheological hydraulically controlled planetary transmission device. the

Detailed ways

The working principle of the present invention is shown in Figure 1, the dotted line part is the magneto-rheological control device, and the planetary transmission mechanism adopts the way of differential planetary gears connected in series. The driving shaft a1 drives the sun gear b1 of the first-stage planetary differential gear train to rotate. When the magneto-rheological fluid solidifies, the power is transmitted to the driven shaft a2 through the magneto-rheological fluid, and the driven shaft a2 and the first-stage planetary differential The ring gear b3 of the gear train is connected, so that the power is transmitted to the first-stage planetary differential gear train to realize differential input. The planetary carrier b4 of the first-stage planetary differential gear train is connected to the sun gear c1 of the second-stage planetary gear train, so that the planetary gear b2 of the first-stage planetary differential gear train transmits power to the second-stage planets through the planetary carrier b4 gear train. The ring gear c3 of the second-stage planetary gear train is fixed on the frame, and the final power is output through the planet carrier c4 of the second-stage planetary gear train. the

As shown in accompanying drawing 2, the present invention can be driven by a motor, and the planetary transmission mechanism in the present invention adopts the mode of differential planetary gears in series, and its power transmission passes through two ways. The first power is driven by the motor to rotate the driving shaft 11. The driving shaft 11 is provided with several inner friction plates 15. The distance between the inner friction plates 15 is determined by the inner cage 14, because the inner friction plates 15 are fixed on the driving shaft 11. Therefore, when the driving shaft 11 rotates, the inner friction plate 15 rotates accordingly. When the excitation coil 6 is energized, the magneto-rheological fluid 10 starts to solidify, and the inner friction plate 15 transmits torque to the outer friction plate 9 through the magneto-rheological fluid 10 , the outer friction plate 9 and the inner friction plate 15 are spaced apart, and the distance between the outer friction plate 9 is determined by the outer cage 8, and both the outer friction plate 9 and the outer cage 8 are fixed on the driven shaft 16, so the driven shaft 16 starts Rotate and output torque. The driven shaft 16 is fixedly connected with the ring gear 3 of the first-stage planetary differential gear train through screws, and the power is transmitted to the first-stage planetary differential gear train. When the magneto-rheological fluid is completely solidified, the inner and outer friction plates rotate at the same speed. After the second power is transmitted to the input shaft 11 by the motor, the input shaft 11 is also the center wheel of the first-stage differential planetary gear train. Through the differential output with the ring gear 3, the planetary gear 18 is driven to rotate, and the planetary gear 18 It is connected with the connecting shaft 27 through the key 26, so that the power is transmitted to the connecting shaft 28. The connecting shaft 27 is also the sun gear of the second-stage planetary gear system. The ring gear 20 is fixed on the frame, so that the planetary gear 21 starts to rotate and passes through The planet carrier 22 transmits the power to the output shaft 25, and finally the output shaft 25 outputs torque to drive the load to run. the

When the motor starts to run, the magneto-rheological fluid under no external current behaves like a fluid, and the rotational speed and torque output by the magneto-rheological control device are almost zero, and only the center wheel 11 of the first-stage differential gear train is in the mechanism. Input speed and torque, the output shaft 25 does not output torque at this time; when the excitation coil 6 is energized, the magnetic field is added to the magnetorheological fluid at this time, the magnetorheological fluid begins to solidify, and the magnetorheological control device works. And start to output the speed and torque. At this time, the power input of the mechanism is divided into two circuits: the magnetorheological control device and the motor. The speed of the load begins to increase. When the magnetorheological fluid is completely solidified and the load speed reaches the maximum value, a startup is completed. process. The greater the current of the excitation coil, the greater the magnetic field generated, so the shear stress of the magneto-rheological fluid is also greater. At the same time, when the magnetic field is constant, the slip (active piece and driven piece The greater the speed difference), the greater the shear stress of the magnetorheological fluid. Therefore, the method of controlling the coil current can be used to control the shear stress of the magnetorheological fluid, and at the same time, the slip can be used to regulate the speed. The specific method is: if the output speed is too high, the coil current can be reduced to make the magnetorheological The slip of the liquid becomes larger, so that the output speed decreases, and vice versa, the coil current is increased, so that the output torque of the device can be adapted to the load, and the corresponding speed can be obtained. the

The present invention is combined in this way: the left casing 2, the right casing 28, and the fixed frame 19 form the casing of the whole device, the driving shaft 11 is connected to the inner friction plate 15 through a key, and the distance between the inner friction plates 15 is passed through the inner friction plate. The cage 14 determines and is axially positioned by it, the distance between the outer friction plates 9 is determined by the outer cage 8 and is axially positioned by it, the driven shaft 16 and the magnetic ring 7 are connected by bolts, and they constitute the whole The cavity of the magneto-rheological fluid control device 5, the magnetic-absolute ring 7 is fixed on the driven shaft 16 by bolts, the cavity between the inner and outer friction plates, that is, the cavity of the magnetorheological control device is filled with the magnetorheological fluid 10, and the coil 6 is wound on the Inside the left casing 2, the leads of the coil 6 are led out through the conduit 17, the magneto-rheological fluid 10 is sealed by a felt ring, the driven shaft 16 is connected with the ring gear 3 of the first-stage planetary differential gear train by bolts, and the driving shaft 11 At the same time, it is also the sun gear of the first-stage differential planetary gear train, the inner ring gear 3, the planetary gear 18, the planetary carrier 4, and the driving shaft 11 constitute the first-stage planetary differential gear train, thereby realizing differential input, the first-stage The planetary carrier 4 of the differential planetary gear train is connected with the connecting shaft 27 through the key 26; the planetary carrier 22, the connecting shaft 27, the planetary gear 21 and the ring gear 20 constitute the second-stage planetary gear train, and the ring gear 20 is fixed on the machine by bolts. On the shell, the planetary carrier 22 is supported on the right casing 28 by bearings, and the right half of the planetary carrier 22 is integrated with the output shaft 25 and supported on the right casing 28 by the bearings. the

The control method of the magneto-rheological hydraulic control transmission device is shown in Figure 3. The torque sensor TB1A/100 and the matching MP55 power amplifier are used to monitor the load torque T in real time. Through AD conversion, the analog signal output by MP55 is converted to Convert it into a digital signal and transmit it to the single-chip microcomputer. The single-chip microcomputer judges whether the output torque of the magneto-rheological hydraulic control transmission can match the torque required by the load, and the single-chip microcomputer controls the output current I of the power supply, thereby changing the magnetic field of the excitation coil. size, thereby changing the magnitude of the shear force of the magneto-rheological fluid, thereby changing the output torque of the magneto-rheological fluid-controlled transmission. When the load torque becomes larger, the torque sensor detects the signal and transmits it to the single-chip microcomputer. The single-chip microcomputer controls the controllable power supply, making the power supply current I larger, so that the output torque becomes larger. On the contrary, if the load torque becomes smaller, the single-chip microcomputer controls The output current I of the power supply becomes smaller, so that the output torque becomes smaller, so that the output torque of the magneto-rheological hydraulically controlled transmission adapts to the load torque, and thus obtains a corresponding speed. the

Claims (4)

1. A magneto-rheological liquid-controlled planetary transmission, characterized in that it comprises a magneto-rheological transmission and a differential planetary gear transmission, wherein the left casing (2), the right casing (28), the fixed frame ( 19) The housing that composes the whole device, the driving shaft (11) is connected with the inner friction plate (15) through a key, and the distance between the inner friction plates (15) is determined by the inner cage (14) and is axially positioned by it , the distance between the outer friction plates (9) is determined by the outer cage (8) and is axially positioned by it, the driven shaft (16) and the magnetic ring (7) are connected by bolts, and they constitute the entire magneto-rheological The cavity of the fluid control device (5), the magnetic-absolute ring (7) is fixed on the driven shaft (16) by bolts, and the cavity between the inner and outer friction plates, that is, the magnetorheological control device, is filled with magnetorheological fluid (10) , the coil (6) is wound in the left casing (2), the lead wire of the coil (6) is drawn out through the conduit (17), the magneto-rheological fluid (10) is sealed by a felt ring, the driven shaft (16) and the first-stage planet The ring gear (3) of the differential gear train is connected by bolts, the driving shaft (11) is also the sun gear of the first stage differential planetary gear train, the ring gear (3), the planetary gears (18), and the planet carrier (4), the driving shaft (11) constitutes the first-stage planetary differential gear train, thereby realizing differential input, and the planetary carrier (4) of the first-stage differential planetary gear train is connected to the connecting shaft (27) through the key (26) ) connected; the planet carrier (22), the connecting shaft (27), the planetary gear (21) and the ring gear (20) constitute the second-stage planetary gear train, the ring gear (20) is fixed on the casing by bolts, and the planet carrier (22) is supported on the right casing (28) by bearings, the right half of the planet carrier (22) is integrated with the output shaft (25) and is supported on the right casing (28) by bearings, and the power is provided by the driving shaft (11) input, output via the output shaft (25). 2. The magneto-rheological fluid-controlled planetary transmission device according to claim 1, characterized in that its power is transmitted through two channels, one is that the motor directly drives the driving shaft (11) to rotate, that is, the first-stage planetary differential The sun gear of the gear train rotates, and the other way drives the driven shaft (16) on the control device to rotate through the drive shaft (11) through the magneto-rheological fluid, thereby driving the ring gear of the first-stage planetary gear train to rotate, thereby realizing the differential Input, by changing the current of the excitation coil, thereby changing the viscosity of the magneto-rheological fluid to realize the control of the load speed and torque. 3. The magneto-rheological fluid-controlled planetary transmission device according to claim 1, characterized in that the planetary transmission mechanism adopts the method of connecting differential planetary gears in series, and the ring gear and the sun gear of the first-stage planetary gear train are used as differential inputs , the planet carrier (4) of the planetary gear system of the first stage planetary gear system is connected with the sun gear of the second stage planetary gear system through a key, and the planet carrier of the second stage planetary gear system is connected to the output shaft to realize power transmission. 4. The magneto-rheological fluid-controlled planetary transmission device according to claim 1, characterized in that: the inner friction plate is connected to the driving shaft (11) through a spline. the

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