| 摘要 |
<p>A method for assembling a rotary valve for hydraulic power assisted steering systems may be used for a rotary valve having the following features: both valve elements of the rotary valve have longitudinal control grooves, interacting control edges of the longitudinal control grooves of the control bushing and of the rotary slide being formed parallel to each other and converging in an oblique manner at the same angle in relation to the longitudinal axis of the rotary valve. The method includes the following steps: the rotary slide is pushed into the control bushing up to a point just ahead of a stop in the region of the valve output member. The two valve elements of the rotary valve are aligned in their central position and are clamped there in a manner secure against rotation in relation to a torsion bar spring. In order to determine the profile of a basic characteristic curve, the rotary valve is deflected fully in both directions and the pressure/angle or the pressure/torque ratio is recorded. The basic characteristic curve is compared with a desired nominal characteristic curve from a predetermined family of nominal characteristic curves (valve characteristic curves). The axial position of the rotary slide is adjusted until the desired nominal characteristic curve has been achieved at least at a predetermined point. The rotary slide is then connected definitively to the torsion bar spring in a manner secure against relative rotation.</p> |
