Coil externally-wrapping magnetorheological fluid damper

Abstract

Provided is a coil externally-wrapping magnetorheological fluid damper. The coil externally-wrapping magnetorheological fluid damper is characterized in that the outside of a working cylinder barrel is provided with a dust-proof housing, one end of which is fixed with guide magnets and coils; a guide groove is formed in outside of the working cylinder barrel; relative sliding is achieved between the dust-proof housing and the working cylinder barrel by means of a steel ball in the guide groove; the coils are fixed in damping holes, just opposite to a piston, of the housings; and coefficient of viscosity of a magnetorheological fluid is affected by current magnitude of the coils such that output of damping force of the damper is thus affected. The coil externally-wrapping magnetorheological fluid damper has following beneficial effects: the excitation coils surround the outside of the working cylinder such that heat of the working cylinder barrel in work can be timely dispersed and magnetic field distribution near the working cylinder can be improved; therefore, the damper has great damping force and a wider adjusting range of damping force; the coils can be easily detached for replacement if damage occurs so that the coils are economical and practical; service lifetime of the damper is prolonged and usage performance of the coil externally-wrapping magnetorheological fluid damper is enhanced; and compared with a conventional mode that a middle hole is casted in the piston rod, the mode that the coils are directly placed outside is more convenient and has an easy process.

Description

technical field [0001] The patent of the invention belongs to auto parts, and specifically relates to a coil outsourcing type magnetorheological fluid shock absorber. Background technique [0002] The automobile shock absorber is an important part of the suspension system. Its main function is to attenuate the shock vibration generated by the vehicle during motion, improve the safety of the car and improve the ride comfort of the car. At present, the suspension of automobiles is mainly passive. For example, the traditional hydraulic shock absorber mainly realizes the damping effect by adjusting the damping of the internal one-way valve, and cannot change the damping coefficient of the shock absorber in real time according to the road conditions. Therefore vehicle ride comfort just cannot be satisfied. The active suspension system with adjustable damping force and spring stiffness can change the damping force and spring stiffness according to road conditions and vehicle driv...

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Problems solved by technology

[0004] The magnetorheological fluid itself is greatly affected by temperature changes. Although injecting coolant between the shell and the working cylinder is a good way to dissipate heat, if the coil is damaged, it will be inconvenient to disassemble and may be replaced directly.

[0005] The excitation coil of the magnetorheological fluid shock absorber mainly has the coil placed outside the working cylinder and the coil placed outside the working cylinder. Although the coil built-in magnetorheological fluid shock absorber has been widely used in various engineering fields, its After working for a long time, there are heating problems and the contradiction between the output force and the structure size of the shock absorber

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