Wedge-shaped extrusion soft start device based on magnetorheological fluid and shape memory alloy

A technology of magnetorheological fluid and memory alloy, which is applied in the direction of transmission, friction transmission, belt/chain/gear, etc. It can solve the problems of performance degradation, low yield stress of magnetorheological fluid, and inability to meet the transmission of high-power power. , to achieve the effect of improving transmission power and reliable transmission performance

Inactive Publication Date: 2014-02-19
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the good performance of magnetorheological fluid in transmission, such as flexible transmission between the main and driven parts, high sensitivity, high precision, and stable stepless speed regulation, it is easy to realize remote control and automatic control of the speed regulation process, etc. , so in recent years, there are more and more studies on the application of magnetorheological fluids in transmission, but magnetorheological fluids also have the following defects in transmission: (1) The yield stress of magnetorheological fluids is small under normal conditions, and cannot To meet the need to transmit high-power power, the researchers found that applying positive pressure to the magnetorheological fluid along the direction of the magnetic field can cause the magnetorheological fluid to produce a squeeze strengthening effect and increase the yield stress of the magnetorheological fluid, thereby increasing its transmission power. How to reasonably apply the extrusion strengthening effect of magnetorheological fluid is a difficult problem in the magnetorheological fluid transmission device at present; work requirements, and the shape memory effect of shape memory alloys can be used to make up for the defects of magnetorheological fluids in transmission. Although researchers have done a lot of research on the separate applications of shape memory alloys and magnetorheological fluids in the field of transmission engineering, However, there are few studies on the combined application of shape memory alloys and magnetorheological fluids in transmissions.

Method used

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  • Wedge-shaped extrusion soft start device based on magnetorheological fluid and shape memory alloy
  • Wedge-shaped extrusion soft start device based on magnetorheological fluid and shape memory alloy

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Experimental program
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Embodiment 1

[0026] see figure 1 , a wedge extrusion soft start device based on magnetorheological fluid and shape memory alloy, including a driving shaft 1 and a driven shaft 2, the driving shaft 1 is provided with a device capable of transmitting the torque output by the driving shaft 1 to the driven shaft 2, the magnetorheological fluid transmission mechanism, the magnetorheological fluid transmission mechanism includes two active inner cylinders 3 sleeved on the drive shaft 1 and capable of rotating with the drive shaft 1, sleeved on the drive shaft 1 and located in the two active inner cylinders The excitation coil 5 between the cylinders 3 and the driven outer cylinder 4 sleeved outside the two active inner cylinders 3 and the excitation coil 5, wherein the diameter of the excitation coil 5 is smaller than the inner diameter of the driven outer cylinder 4, the active A wedge-shaped working gap 6 is formed between the inner cylinder 3 and the driven outer cylinder 4, and the gap betw...

Embodiment 2

[0030] The active inner cylinder 3 and the drive shaft 1 of this embodiment have perforations corresponding to each other, and the active inner cylinder 3 and the drive shaft 1 have flow guide holes 12 communicating with the perforations; two tops are symmetrically installed in the perforations. Rod 10, an O-ring 14 is arranged between the ejector rod 10 and the perforation, there are guide grooves corresponding to each other on the two ejector rods 10, a guide rod 11 is arranged between the two ejector rods 10, and the two ends of the guide rod 11 They are respectively located in the guide grooves of the two push rods 10. When there is relative rotation between the driving inner cylinder 3 and the driven outer cylinder 4, the magneto-rheological fluid in the wedge-shaped working gap 6 is squeezed through the guide hole 12 It flows into the perforation and pushes the two push rods 10 to move so that the push rods 10 engage with the driven outer cylinder 4 .

[0031] When the e...

Embodiment 3

[0033]A spring 13 made of a shape memory alloy is arranged between the two push rods 10 of this embodiment, the spring 13 is sleeved on the guide rod 14, a step is provided at the opening of the guide groove of the two push rods 10, and the spring 13 is sleeved on the guide rod 14. On the guide rod 12, and the two ends of the bullet 13 are respectively positioned on the steps at the openings of the guide grooves of the two push rods 10. When the temperature rises and the transfer performance of the magneto-rheological fluid decreases, the spring 13 will elongate under the effect of heat to help push the ejector rod 10, so that the ejector rod 10 is engaged with the driven outer cylinder 4, thus ensuring the soft start device The transmission power at high temperature makes the transmission performance of the soft starter more reliable.

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Abstract

The invention discloses a wedge-shaped extrusion soft start device based on magnetorheological fluid and shape memory alloy. The wedge-shaped extrusion soft start device comprises a driving shaft and a driven shaft. A magnetorheological fluid transmission mechanism is arranged on the driving shaft. The magnetorheological fluid transmission mechanism comprises a driving inner cylinder, a driven outer cylinder and an excitation coil, wherein the driving inner cylinder sleeves the driving shaft and can rotate along the driving shaft, the driven outer cylinder sleeves the driving inner cylinder and can transmit the torque output by the driving inner cylinder to the driven shaft, the excitation coil can generate a magnetic field, a wedge-shaped work gap is formed between the driving inner cylinder and the driven outer cylinder, the wedge-shaped work gap is filled with magnetorheological fluid, and the magnetic field generated by the excitation coil can act on the magnetorheological fluid in the wedge-shaped work gap to enable the driving inner cylinder to drive the driven outer cylinder to rotate through the magnetorheological fluid. The wedge-shaped extrusion soft start device uses the extrusion reinforcing effect of the magnetorheological fluid to improve the transmission power. Meanwhile, the torque is transmitted through assistance of the memory alloy, so that the transmission performance of the soft start device is more reliable.

Description

technical field [0001] The invention relates to a starting device installed between a prime mover and a working machine for power transmission, in particular to a wedge-shaped extrusion soft starting device based on magnetorheological fluid and shape memory alloy. [0002] Background technique [0003] The traditional mechanical device is prone to mechanical shock when it is started, which affects the service life of the mechanical device, especially in the case of starting with load, the mechanical shock is more obvious. Shape memory alloys (SMA) and magnetorheological fluids (MR fluids) are new smart materials. After a shape memory alloy with a certain initial shape undergoes a certain degree of deformation under certain conditions, the reverse deformation will occur by appropriately changing the temperature. , to restore the material to its original shape. During the shape restoration process, if the shape memory alloy is constrained, it will generate a large restoring f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H15/01
CPCF16H15/01
Inventor 黄金陈松杨岩
Owner CHONGQING UNIV OF TECH
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