Magnetorheological damper with adjustable piston net cross section area

Abstract

The invention discloses a damper, and particularly relates to a magnetorheological damper, in particular to a magnetorheological damper with the adjustable piston net cross section area. The magnetorheological damper comprises a main piston and an auxiliary piston, wherein the main piston and the auxiliary piston are overlapped and coaxial. Due to the fact that the two pistons relatively rotate in the radial direction, the net cross section area is adjusted, and the damping performance is improved. As for relative radial rotation between the main piston and the auxiliary piston, one of the main piston and the auxiliary piston can be driven by a motor to perform radial movement, and relative radial movement of the other one of the main piston and the auxiliary piston is limited, or, spirally-inclined guide grooves matched with convex lugs or teeth on the periphery of the auxiliary piston are formed in the inner wall of a piston cylinder, and when the auxiliary piston vertically and axially moves along with the main piston, relative radial movement of the main piston and the auxiliary piston is generated under the abutting and pushing effect between the convex lugs or the teeth and the guide grooves. By means of the magnetorheological damper, the multiple functions can be achieved, the same damper can have multiple modes such as the flow valve mode, the shearing mode, the extruding mode and the combined mode of the flow valve mode, the shearing mode and the extruding mode at the same time, and the production cost is reduced.

Description

technical field [0001] The present invention relates to a damper, especially a magneto-rheological (MR) damper, in particular to a magneto-rheological damper with adjustable net cross-sectional area of ​​the piston, comprising two overlapping coaxial pistons, passed through two The piston rotates radially relative to each other to adjust the net cross-sectional area, expand the damping force adjustment means, and improve the performance of the damper. Background technique [0002] Magneto Rheological Fluid (MRF) is composed of tiny metal particles (such as iron powder), carrier fluid and stabilizer, etc., with the change of external magnetic field, the suspension of specific non-colloidal properties with controllable rheological properties liquid. Under the action of no magnetic field, it behaves like a general fluid. When an external magnetic field is applied, the rheological behavior of magnetorheological fluid shows that the yield stress increases linearly with the inten...

AI Technical Summary

Problems solved by technology

[0003] However, the damping hole or separate bypass passage of the traditional damper is often a fixed structure, and the net cross-sectional area of ​​the damping hole or bypass passage of the fixed structure is constant. Under the same magnetic field strength, the damping force adjustment range of the damper is fixed. When When the magnetic field strength is established faulty or other needs related to the adjustable damping performance, it will lead to the technical problem of uncontrollable damping performance. Once the damper is uncontrollable, it will easily delay the normal production or even damage the production equipment, causing economic losses.

In addition, due to the fixed structure of the traditional damper, it cannot realize multi-functional multi-purpose in multiple fields, resulting in excessive vibration control costs

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