FILTER DEVICE AND POWER STEERING DEVICE

PROBLEM TO BE SOLVED: To provide a power steering device suppressing that contaminants are caught in a pump by filtering, even in a structure wherein hydraulic oil alternately comes and goes between right and left pressure chambers according to normal/reverse rotations of the pump. SOLUTION: The power steering device comprises a hydraulic power cylinder assisting steering force of a steering mechanism coupled to turning wheels, a reversible pump equipped with a pair of discharging ports supplying oil pressure to both pressure chamber of the hydraulic power cylinder through first and second passages, a motor connected to the reversible pump and make the reversible pump normally/reversely rotate, a steering load detecting means detecting or estimating a steering load of a steering wheel controlling to turn the turning wheels, a motor controlling means outputting a driving signal to the motor so as to generate required oil pressure to the motor on the basis of the steering load, and filters provided between the reversible pump and both pressure chambers of the hydraulic power cylinder. COPYRIGHT: (C)2006,JPO&NCIPI