A retractable magneto-rheological damper with built-in permanent magnets in double rods

Abstract

The invention discloses a double-outlet-rod telescopic magneto-rheological damper with built-in permanent magnets. The double-outlet-rod telescopic magneto-rheological damper comprises the two built-in permanent magnets (14) and a movable inner cylinder (19), wherein the two built-in permanent magnets (14) are symmetrically distributed on a piston (13), the movable inner cylinder (19) is arranged in a center hole of a fixed outer cylinder (10), the external diameters of the two ends of the movable inner cylinder (19) are smaller than the internal diameters of a left end cover (20) and a right end cover (18) of the fixed outer cylinder, and the external diameter of the middle of the movable inner cylinder (19) is larger than the inner diameter of the movable inner cylinder (19). The damper is internally provided with the two NdFeB permanent magnets in series and externally provided with an electromagnet, the permanent magnet do not need to be powered on, the heat dissipating problem does not exist in the damper, the using reliability of magneto-rheological liquid is integrally improved; meanwhile, by means of the double-outlet-rod structure with the movable inner cylinder, a gas compensation device does not need to be additionally arranged, the working stroke is increased, the stroke of the damper is greatly increased on the original basis due to the fact that the inner cylinder is movable, and a very large advantage is achieved on the large-stroke damper.

Description

technical field [0001] The invention relates to a magneto-rheological damper with double-outlet rods, in particular to a retractable magneto-rheological damper with built-in permanent magnets in double-outlet rods, which belongs to the technical field of magnetorheological fluid. Background technique [0002] Magnetorheological fluid is a new type of magnetic functional material. When there is no external magnetic field, it behaves as a well-flowing Newtonian fluid. However, under the action of an external magnetic field, the rheological properties of the fluid change dramatically, showing mechanical properties similar to solids. And the viscosity change is continuous and reversible, that is, once the magnetic field is removed, it becomes a flowable liquid again. The continuous, reversible, rapid and easy-to-control characteristics of magnetorheological fluid effects make magnetorheological fluid mechanical devices have very wide application prospects in aviation, aerospace,...

AI Technical Summary

Problems solved by technology

[0003] The magneto-rheological damper is an intelligent damping device. The existing damper generally places the electromagnetic coil on the piston, and adjusts the damping force by changing the magnitude of the current, but the coil will generate A lot of heat, under such working conditions, the performance of the magneto-rheological damper will decrease, and the expected effect will not be achieved; the working stroke of the magnetorheological damper with two rods is limited by the length of the working cylinder, blindly Increasing the length of the working cylinder or increasing the length of the piston rod will increase the overall size of the damper

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