POWER STEERING SYSTEM


  1. CONSTRUCTION


    1. The steering column assembly consists of an electric power steering column sub-assembly, power steering motor assembly and power steering ECU assembly.

    2. The electric power steering column sub-assembly includes a torque sensor and reduction mechanism.

      A018GF1C01
      *1 Electric Power Steering Column Sub-assembly *2 Power Steering Motor Assembly
      *3 Power Steering ECU Assembly *4 Torque Sensor
      *5 Reduction Mechanism - -
      *a A-A Cross Section *b B-B Cross Section

    3. The torque sensor consists of a sleeve, stub shaft and 2 detection coils.

    4. The sleeve is mounted on the input shaft, and the stub shaft is mounted on the output shaft. The input shaft and the output shaft are joined by the torsion bar. The detection coils are placed on the outside of the sleeve to complete an excitation circuit without making contact.

    5. When the steering wheel is turned, the twist that is created in the torsion bar creates a relative displacement between the sleeve and the stub shaft. The torque sensor outputs this change as an electrical signal to the power steering ECU assembly.

      A018G7EC01
      *1 Torque Sensor *2 Stub Shaft
      *3 Sleeve *4 Detection Coil
      *5 Input Shaft *6 Torsion Bar
      *7 Output Shaft - -

    6. A low inertia, low noise, and high power output brushless type power steering motor assembly is used.

    7. The power steering motor assembly consists of a rotor, stator, motor shaft and rotation angle sensor.

    8. The rotation angle sensor consists of a highly reliable and durable resolver sensor. The rotation angle sensor detects the rotation angle of the motor and outputs it to the power steering ECU assembly. As a result, effient EPS is ensured.

    9. The torque that is generated by the power steering motor assembly is transmitted via the joint to the reduction mechanism.

    10. The reduction mechanism reduces the speed of the power steering motor assembly via a worm gear and wheel gear and transmits it to the column shaft.

    11. The wheel gear is made of a high strength, low friction, and low wear plastic material, to realize low noise and a lightweight construction.

    12. A worm gear supported by ball bearings is used. Also, a spring is provided to ensure optimal gear engagement at all times.

      A018GFOC01
      *1 Spring *2 Ball Bearing
      *3 Worm Gear *4 Column Shaft
      *5 Wheel Gear *6 Power Steering Motor Assembly
      *a This illustration is an example only. - -