| 摘要 |
<p>A fuel injection pump of the rotary distributor type has a piston 35 for adjusting the timing of fuel delivery, a valve member 28 adjustable to determine fuel quantity and a low pressure pump which supplies fuel at a pressure varying with speed. Fixed orifices 60, 74 are connected in series between the outlet of the low pressure pump and a variable orifice 53, 76 defined by the member 28, the variable orifice allowing fuel flow to a drain. The piston is subject to the pressure intermediate the fixed orifices. A first valve means 45 is responsive to the pressure drop across the orifice 60 and acts to maintain the pressure drop constant on reaching a predetermined value and a second valve means 46 is responsive to the pressure between the orifices and when this attains a predetermined value it opens a flow path from downstream of the orifice 74 to a drain at 54. <IMAGE></p> |
