| 摘要 |
<p>A rotary sliding valve consisting of a valve liner (1) and a rotary sliding valve (2) is fitted with control channels (3 to 8 or 16 to 18) distributed around the periphery having control edges (e.g. 27, 28) for control and distribution of the pressurized oil. The pressure buildup in an ancillary servomotor (12) is managed by deflecting part of the incoming flow. This deflection occurs at the control edges in control phases. A return flow channel (20) located behind each of the incoming flow control edges (e.g. 28) is fitted with a deep gap (34) which has a relatively large flow-through cross section. On both sides of the deep gap are arranged choke gaps (35 and 36). The choke gaps have a narrow choke cross-section. When the rotating walve (2) is rotated, e.g. in a clockwise direction, a high pressure gradient develops between the control channel (3) connected with the active pressure chamber (10) and the return-flow channel (20). In order to avoid the production of hissing noises when the pressurized oil enters the return flow channel (20), the deep gap (34) is closed at the time of a control phase (9), still in the low pressure area at approximately 30 bar. Then, in the high pressure area, the pressure regulation is effected only by way of the choke gaps (35 and 36), with the deflected flow being conducted over a long choke stretch. In this choke stretch the pressure is gradually reduced to that of the low pressure area so that there are no flow-out noises at the entry to the return flow channel (20).</p> |
