| 摘要 |
PURPOSE:To achieve sufficient steering response corresponding with the car speed by providing means for producing hydaulic pressure corresponding with the car speed in the reaction chamber and the rack guide pressurizing chamber. CONSTITUTION:Upon entering into high speed travel condition, smaller current is fed to a solenoid 65 when compared with that under low speed traveling, to displace a control spool 67 downward thus to increase the repellent force of spring 69. Consequently, the hydraulic pressure in a feed path 63 is set at high level. While main spool 59 will displace to the position corresponding with the pilot pressure thus to set the pressure in first feed path 57 at high level. Since high pressure in the path 63 is fed into the pressure chamber 36 and the rack pressurizing chamber 44, pushing forces of rack guide 41 and plunger 34 respectively against the rack shaft 14 and the projected section 30 will increase. Consequently, the torsion bar 25 is never twisted by small steering torque thus to increase the rigidity at the servo section. |
