Inner by-pass valve type magnetorheological fluid suspension

Abstract

The invention discloses an inner by-pass valve type magnetorheological fluid suspension. The inner by-pass valve type magnetorheological fluid suspension is characterized in that according to a magnetorheological fluid unit, a hydraulic cavity is formed by an outer cylinder block, an inner cylinder barrel is concentrically arranged in the outer cylinder block, and an annular runner is formed between the outer cylinder block and the inner cylinder barrel; a magnetic exciting coil is embedded in an annular groove in the periphery of the inner cylinder barrel, and the magnetic exciting coil produces a magnetic field to enable magnetorheological fluid in the annular runner to work in a flow pattern; a rubber main spring in a rubber unit with bearing static loads is located on the exterior of the hydraulic cavity; and a piston rod and a piston form a piston mechanism, the piston axially moves in the inner cylinder barrel to drive the magnetorheological fluid in the hydraulic cavity to flow between the annular channel and an inner cavity of the inner cylinder barrel, and parallel action between the piston mechanism and the magnetorheological fluid unit is achieved. The inner by-pass valve type magnetorheological fluid suspension can control the damping force of the magnetorheological fluid, the dynamic rigidity of the suspension can be controlled, and the inner by-pass valve type magnetorheological fluid suspension has a large damping force control range, a maximal operating stroke and small null field dynamic rigidity.

Description

technical field [0001] The invention relates to the technical field of using magnetorheological fluid for vibration reduction, in particular to a valve-type magnetorheological fluid mount used for engine mount systems of automobiles, ships, engineering machinery and the like. Background technique [0002] Hydraulic mounts are currently widely used in engine mount systems such as automobiles, ships, and construction machinery. Compared with cheap rubber mounts, hydraulic mounts exhibit greater damping characteristics under low-frequency excitation, which inhibits the mounting system to a certain extent. Under high-frequency excitation, due to the blockage of the damping hole or the inertia channel, the large stiffness characteristic of the hydraulic mount deteriorates the high-frequency vibration isolation performance of the mount system. Compared with ordinary suspension liquids, magnetorheological fluids are smart materials with adjustable rheological properties. Under the ...

AI Technical Summary

Problems solved by technology

The magneto-rheological fluid mount with this structure does not solve the problem of blockage of the damping hole or inertial channel during high-frequency vibration. Even with the addition of a decoupler, the resonance of the liquid will still increase the zero-field motion of the mount. Stiffness; at the same time, due to the blockage of the damping hole or inertial channel, the adjustable range of the damping force of the magnetorheological fluid mount of this structure is limited; moreover, due to the large volume of the upper liquid chamber, the magnetorheological fluid mount of this structure needs to use A large amount of magnetorheological fluid increases the production cost of the mount

[0004] Based on this, the Chinese invention patent "engine magnetorheological hydraulic mount based on extrusion mode", publication number: CN103148158A, discloses a magnetorheological fluid extrusion mount for automobile powertrain mount system. The suspension is equipped with upper and lower extrusion pole plates, inertial channels and decoupling membranes, and the extrusion motion of magnetorheological fluid in the upper and lower extrusion pole plates does not interfere with the flow motion of magnetorheological fluid in the inertial channel, so even In the case of blockage of the inertial channel, the extrusion motion of the magneto-rheological fluid can still be used to control the dynamic stiffness of the mount in a large range; large zero-field dynamic stiffness problem

Chinese invention patent "Magneto-rheological fluid mount based on one-way extrusion mode", publication number: CN104776153A discloses a magneto-rheological hydraulic mount in one-way extrusion mode, which abandons the damping in traditional hydraulic mounts Hole or inertia channel structure, and the rubber main spring is set separately from the magneto-rheological fluid extrusion unit. Only the extrusion characteristics of the magneto-rheological fluid are used to adjust the dynamic stiffness of the suspension, effectively avoiding high-frequency blockage or high-frequency flow of the fluid. Vibration; but because the extrusion performance of magnetorheology is limited by the size of the extrusion gap, the extrusion effect of magnetorheological fluid will be more obvious only when the extrusion gap is small, so the application range of this mount is limited The vibration displacement amplitude is limited, and in specific use, the initial extrusion gap of the extruded plate will change with the change of the preload, which will affect the mechanical properties of the suspension

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