| 摘要 |
<p>Proposed is a pressure valve fitted in the feed line (7, 7') leading from a fuel-injection pump to a fuel-injection valve (8). The pressure valve has a closure element (121) which opens in the fuel-feed direction and which has a return-flow shoulder (135). To ensure uniform injection, in particular at a given load over the engine-speed range, the rate of increase of the cross-sectional area of the flow passage defined by the valve closure element (121) is controlled by virtue of the fact that, immediately adjacent to the return-flow shoulder (135), is a control element (131) with three recesses (138) round its perimeter. These recesses are bounded by the through-channel (120) in which the valve-closure element (121) is guided, and have the same, given, opening area, the sum of the opening areas being of the same order of magnitude as the cross-sectional area of the feed line. As the stroke movement progresses, the rim (139) bounding the recesses (138) on the flow-return shoulder (135) and the rim (122) at the outlet of the through-channel (120) together leave in the zone of the recesses (138) a complete passage which is never larger in cross-section area than the cross-sectional area of one recess.</p> |
