Magneto-rheological stepless speed changer

Abstract

The invention relates to a multi-disc type magneto-rheological stepless speed changer which mainly comprises a magnetic isolation hub, an input shaft, an output shaft, a driving friction plate, a driven friction plate, magnetic exciting coils and magnetic isolation rings; wherein the driving friction plate and the driven friction plate are respectively fixed on an outer magnetic isolation circular ring and the magnetic isolation hub through the magnetic isolation rings; a right magnetic conducting lateral plate is connected with the input shaft through a big magnetic isolation circular ring and a left magnetic conducting lateral plate; the output shaft is connected with the driven friction plate and the magnetic isolation hub; magneto-rheological fluid is sealed between the driving friction plate and the driven friction plate through a seal ring; the magnetic exciting coils are fixed on two bearing seats through a magnetic conducting shell, the left magnetic isolation lateral plate and the right magnetic isolation lateral plate in a motionless way, and the driving friction plate and the driving friction plate are in interleaved matching and isolated through the magnetic isolation rings. The shear yield stress of the magneto-rheological fluid can be changed by adjusting the electric current of the magnetic exciting coils, therefore, the speed difference between a driving shaft and a driven shaft is changed, and the stepless speed change is further realized. The invention has the advantages of simple structure, no electric sparks, high transmission torque and large transmission power.

Description

technical field [0001] The invention relates to a transmission, in particular to a magneto-rheological stepless transmission used for speed regulation of mechanical equipment with relatively large transmission torque. Background technique [0002] The traditional liquid viscous transmission is a fluid transmission technology that uses the shearing effect of the oil film to transmit torque. It is based on Newton's law of internal friction, and the transmission torque can be controlled by changing the thickness of the oil film. It is characterized by high speed regulation sensitivity and good stability, and the output speed can be adjusted steplessly within the range of 0-100%. However, it requires a huge oil supply system and complex control devices, which is bulky and expensive. [0003] Magnetorheological fluid is a smart material that can produce significant rheological properties under the action of a magnetic field. In the past ten years, due to its superior rheologica...

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Problems solved by technology

The above patents are all introductions to magnetorheological clutches and brakes. At present, there are few patents on magnetorheological continuously variable transmissions at home and abroad. CN1523251A discloses a magnetorheological continuously variable transmission with a V-shaped rotor structure, which adopts a double V-shaped structure. , the structure is simple, the transmission torque is small, and it is suitable for industrial low-power occasions, but it is not suitable for occasions that need to transmit high power. In addition, due to the small transmission power, the heat dissipation characteristics of the device are not considered; the brush mechanism is adopted. The coil can be rotated, reducing the size of the equipment, but the use of brushes is easy to generate electric sparks, which has limitations in coal mines and other occasions that require electric sparks

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