| 摘要 |
<p>A variable rate pump is disclosed which comprises a distributor member (10) rotatable within a sleeve (14). The distributor member (10) is provided with a bore within which a pumping plunger (20) is reciprocable under the influence of a first cam lobe (28) and a second cam lobe (30). Valve means is provided for selecting whether fuel is supplied due to the motion of the plunger (20) under the influence of the first cam lobe (28) or the second cam lobe (30). An arrangement is also disclosed in which the distributor member carries first and second plungers (80, 84, 94, 96) each reciprocable under the influence of respective cam lobes. A valve (88, 100) is provided for selecting whether the fuel is supplied to the first plunger (80, 94) or by the second plunger (84, 96). <IMAGE></p> |
