PRESSURE CONTROL UNIT

PROBLEM TO BE SOLVED: To provide a compact and light-weight pressure control unit that controls oil pressure accurately and has improved layout properties. SOLUTION: An oil pressure control unit 14 comprises: a housing 21 having a flow inlet 21a and a flow outlet 21b of oil; a super-magnetostrictive shaft 22 provided in an electronic component storage section 21d in the housing 21; a pressure receiving plate 23 for applying oil pressure to the super-magnetostrictive shaft 22; a sensor coil 24 for detecting the permeability of the super-magnetostrictive shaft 22, changing according to the oil pressure; an actuator coil 25 for expanding and contracting the super-magnetostrictive shaft 22 by applying a magnetic field with respect to the super-magnetostrictive shaft 22; and a needle valve 26 in linking with the expansion and contraction of the super-magnetostrictive shaft. The super-magnetostrictive shaft 22 has permeability changed, when stress is applied from the outside, and a ratio of magnetostriction is changed, by applying magnetic field from the outside, so that the super-magnetostrictive shaft is used as an actuator for driving the pressure sensor and the valve. COPYRIGHT: (C)2007,JPO&INPIT