Inner-channel vehicle suspension system magnetorheological damper

Abstract

The invention discloses an inner-channel vehicle suspension system magnetorheological damper, which comprises a cylinder barrel; a combined electromagnetic piston and a floating piston are arranged in the cylinder barrel in sequence from top to bottom; the combined electromagnetic piston divides the cavity chamber above the floating piston into an upper cavity chamber and a lower cavity chamber, which are filled with magnetorheological fluid; a bottom cover is arranged at the bottom end of the cylinder barrel; the bottom cover is respectively fixedly connected with an inflating and deflating valve and a lower lifting ring; a guide seat is arranged at the upper end of the cylinder barrel; the upper end of the guide seat tightly covers an upper end cover pressing the guide seat; the lower end of the guide seat is fixedly connected with a buffering block; the combined electromagnetic piston is fixedly connected with a piston rod penetrating through the guide seat and the upper end cover to extend outwards; the outer end of the piston rod is fixedly connected with an upper lifting ring of which the inside is provided with a wire outgoing groove. The inner-channel vehicle suspension system magnetorheological damper is simple in structure and low in manufacturing cost, can accurately adjust vehicle vibration generated by random excitation of a road face, and is high in work efficiency and work stability; the floating piston is enabled not to be clamped in the moving process up and down, and is stable when being used for pressure compensating; the liquid cannot easily leak in the work process.

Description

technical field [0001] The invention relates to a suspension vibration control device, in particular to a magneto-rheological shock absorber of an inner channel type automobile suspension system. Background technique [0002] Magneto-rheological fluid is an intelligent material whose yield stress and viscosity can change with the external magnetic field. It has the characteristics of fast, reversible and controllable. Combining it with the shock absorber can make the shock absorber continuously and controllably adjusted The output of mechanical equipment is a promising new type of semi-active shock absorber. Due to the variable damping of the shock absorber combined with magnetorheological fluid, simple structure, good robustness, low power and fast response, it is widely used in aerospace industry, bridge buildings and other fields, especially in the automotive industry . [0003] Existing magneto-rheological shock absorbers for automotive suspension systems are generally...

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Problems solved by technology

[0004] 1. Most of the magnetorheological fluid of the magnetorheological shock absorber flows along the axial channel around the electromagnetic piston, which causes the heat generated by the electromagnetic coil to be wrapped by the liquid and cannot be dissipated in time, thus intensifying the temperature effect on the magneto-rheological shock absorber. The rheological effect and the influence of fluid viscosity; the damping area where the magneto-rheological effect occurs mainly occurs between the cylinder and the piston. During the reciprocating motion of the shock absorber, the piston rod and the cylinder are easily not on the same axis, so that The width of the gap where the magneto-rheological effect occurs varies everywhere, so it is easy to cause the axial damping force of the piston to be different and cause stagnation

[0005] 2. In order to increase the effective length of the magneto-rheological effect and the utilization rate of the magnetic field to increase its controllable damping force, methods such as increasing the axial length of the piston and the number of winding stages are generally adopted, which greatly shorten the installation profile when the installation profile remains unchanged. The working stroke of the shock absorber is reduced and the utilization rate of the magnetic field is not high

[0006] 3. If it is necessary to adjust the width of the gap where the magneto-rheological effect occurs, the shock absorber piston structure needs to be redesigned and processed, thereby increasing the production cycle of different specifications of such products and increasing the manufacturing cost

[0007] 4. As for the asymmetry of the tension and pressure damping force on the vehicle, most of them use valves to match, and the opening of the valve cannot be accurately controlled, so the magneto-rheological shock absorber cannot be accurately controlled in real time

Although this magneto-rheological shock absorber improves the working stability of the shock absorber and has a large load-carrying capacity, when the shock absorber works for a long time, the coil winding is surrounded by liquid, and the high temperature generated by the electromagnetic heat is not easy to dissipate. It is easy to cause unstable fluid viscosity and failure of magnetorheological fluid effect; at the same time, the magnetic circuit of this shock absorber only generates a magnetic field in the damping gap channel facing the non-wound piston shaft section, and the effective magnetic field area of ​​each section is limited , cannot give full play to the Coulomb damping force of the magneto-rheological shock absorber

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