Patent ID: 7735596

Claim:
A power steering apparatus comprising: a hydraulic power cylinder including first and second fluid pressure chambers configured to assist a steering mechanism; a reversible pump including first and second outlets configured to supply a hydraulic pressure to the power cylinder; a first fluid passage connecting the first outlet of the reversible pump with the first pressure chamber of the power cylinder; a second fluid passage connecting the second outlet of the reversible pump with the second pressure chamber of the power cylinder; a motor configured to drive the reversible pump in one of forward and reverse directions; a steering load sensing section configured to ascertain a steering load of the steering mechanism; and a motor controlling section configured to control the motor in accordance with the steering load; wherein the first and second fluid passages are asymmetric such that the first and second fluid passages are unequal in pressure loss; and wherein the power steering apparatus further comprises a correcting section configured to make pressure losses of the first and second fluid passages substantially equal to each other; wherein each of the first and second fluid passages comprises a flexible tube.