SUSPENSION AND MR DAMPER WITH FUNCTION OF SEMI-ACTIVE AND PASSIVE DAMPER

摘要

A MRF damper of a suspension with passive and semi-active operational function is provided to reduce size and to reduce dangerousness caused by malfunction of the damper by allowing a spring to perform cracking operation. An MRF(Magneto-Rheological Fluid) damper of a suspension with passive and semi-active operational function comprises a center orifice(113), a plurality of periphery orifices(114), and a spring(112). An electromagnet(111) having a coil(111a) is formed at the center part of the center orifice. The coil is controlled by a controller. The center orifice regulates flow and speed of an MRF(107) if pressure of the suspension is lower than set pressure. The plural periphery orifices are formed at a periphery of the center orifice and regulating flow and speed of MRF flowed into/out. The spring is formed at the center orifice and one end of the periphery orifices, and operated by the MRF when pressure of the suspension is over set pressure. The spring is shaped as a disk.