Magnetorheological shock absorber working in mixed modes

Abstract

The invention discloses a magnetorheological shock absorber working in mixed modes. The magnetorheological shock absorber comprises a working cylinder, a guide end cover, a piston and a floating piston, wherein the piston is coaxially and slidably installed inside the working cylinder and comprises a piston rod and a piston body which are coaxially installed, the piston body is internally and fixedly provided with a coil, the coil generates a magnetic field under the action of an external control system, magnetorheological fluid inside a piston hole gap works in a flowing mode under the actionof the magnetic field, the magnetorheological fluid inside a narrow gap works in a shearing mode under the action of the magnetic field, and the magnetorheological fluid inside a conical gap works ina squeezing mode under the action of the magnetic field. According to the magnetorheological shock absorber working in the mixed modes, more of the shearing and squeezing modes are introduced in theworking process which is originally dominated by the flowing mode, exertion of the solid-like characteristic of the magnetorheological fluid is facilitated, excessive sensitivity of shock absorber damping force on speed change is avoided, the fact that the damping force change curve is close to the ideal state is facilitated, and calibration and control processes are made to be more convenient.

Description

technical field [0001] The invention belongs to the technical field of automobile chassis components, and in particular relates to a magneto-rheological shock absorber working in a mixed mode. Background technique [0002] Piston-type shock absorbers provide damping force through the resistance of the moving piston in the working medium, resulting in attenuation of relative motion, and are widely used in many fields such as vehicles, machinery, construction, and bridges. The magnetorheological shock absorber is an electronically controlled shock absorber with magnetorheological fluid as the core working medium. It uses the different performances of the magnetorheological fluid in different electromagnetic environments to achieve controllable damping, and then to control the damping at different speeds. The relative movement can achieve the best attenuation effect. [0003] The working mode of magnetorheological fluid can be divided into three types: flow, shear and extrusio...

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Problems solved by technology

[0004] In the process of design and use of magnetorheological shock absorbers in the prior art, the principle mainly used is the flow mode of magnetorheological fluid, and the attention and application of shear mode and extrusion mode are not enough. The phenomenon of shearing and extrusion of the magnetorheological fluid naturally produced in the shock absorber also has little influence on the damping force of the shock absorber, resulting in the liquid characteristics of the magnetorheological fluid being obvious while the solid-like characteristics are not in the working process of the shock absorber. If it is properly applied, the damping force of the shock absorber is too sensitive to the change of speed, and the change curve of the damping force is quite different from the ideal state. Calibration difficulty and workload

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