| 摘要 |
<p>The cylindrical bush (6) surrounds a cavity extending over all or part of the bush length. The cavity includes guide surfaces inclined with respect to the bush longitudinal axis. The bush cavity occupies most of the bush volume. The guide surfaces are conical; their smaller diameters contacting the support shoe (8). In variant design, the guide surfaces are spiral or screw-like. The guide surfaces are formed by a guide body (17). This is an insert fitted into the bush. Bodies fitted into the bush cavity, reduce the flow cross section.</p> |
