Description (page 2 of 2)

The steering box assembly is similar to the traditional mechanical rack steering box apart from the following:

• an operating cylinder (2) has been integrated with the steering box with a double action piston (1) machined onto the rack rod;
• a distribution valve (3) with relative ducts is located in the worm screw seating and is controlled by a torsion device (4) located at the tip of the worm screw.

Depending on the torsion transmitted by the steering wheel to the device, the fluid from the pump is sent to the reservoir or to one of the two chambers A or B of the operating cylinder. Force generated by the fluid pressure on the lateral surface of the piston determines its movement and hence of the rack.

1. Double action piston
2. Operating cylinder
3. Distribution valve
4. Torsion device
5. A. Right-hand chamber of the operating cylinder
6. B. Left-hand chamber of the operating cylinder