Wedge squeeze soft start device based on magnetorheological fluid and shape memory alloy

Abstract

The invention discloses a wedge extrusion soft start device based on magnetorheological fluid and shape memory alloy, which comprises a driving shaft and a driven shaft, the driving shaft is provided with a magnetorheological fluid transmission mechanism, and the magnetorheological The hydraulic transmission mechanism includes a driving inner cylinder that is sleeved on the driving shaft and can rotate with the driving shaft, and a driven outer cylinder that is sleeved outside the driving inner cylinder and can transmit the torque output by the driving inner cylinder to the driven shaft. and an excitation coil capable of generating a magnetic field, a wedge-shaped working gap is formed between the active inner cylinder and the driven outer cylinder, and magnetorheological fluid is installed in the wedge-shaped working gap, and the magnetic field generated by the excitation coil can act on the wedge-shaped The magnetorheological fluid in the working gap enables the active inner cylinder to drive the driven outer cylinder to rotate through the magnetorheological fluid. The invention utilizes the extrusion strengthening effect of the magneto-rheological fluid to improve the transmission power of the soft start device; meanwhile, the invention assists in the transmission of torque through memory alloys, 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. Background technique [0002] 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 (MRfluids) 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, in the process of shape recovery, if the shape memory alloy is constrained, it will generate a large restoring force, which can b...

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Problems solved by technology

[0003] 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 have been 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 current magnetorheological fluid transmission device; (2) The performance of magnetorheological fluid will decrease with the increase of ambient temperature, which cannot meet the requirements of different temperature environments 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.

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