Patent ES-8605076-A1 (ES)
Title: Fuel injection pump
IPC: F02M41/14
Filed: 1985-04-16
Abstract: The pump has a piston (35) for adjusting the timing of fuel delivery, and a valve member (28) adjustable to determine fuel quantity. Alow pressure pump member supplies fuel at a pressure varying with speed. Fixed orifices (60, 74) are connected in series between the outlet of the low pressure pump member and a variable orifice (53, 76) defined by the valve member. The variable orifice allows fuel flow to a drain. The piston is subject to the pressure intetermediate the fixed orifices. - A first valve element (45) is responsive to the pressure drop across the first orifice and acts to maintain the pressure drop constant on reaching a predetermined value. A second valve element (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 second orifice (7) to a drain (54).  (10pp Dwg.No 1/8) GBAB- GB2174515 B A fuel injection pump of the kind specified comprising an adjustable orifice through which fuel can flow to a drain, said adjustable orifice being controlled in accordance with the setting of said means whereby as said means is adjusted to increase the amount of fuel supplied to the associated engine the degree of restriction offered by said adjustable orifice will be decreased, first and second fixed orifices connected in series with said adjustable orifice with the first fixed orifice being positioned immediately downstream of the outlet of the low pressure pump, said fluid pressure operable device being responsive to the pressure intermediate said first and second fixed orifices, first valve means responsive to the pressure drop across said first fixed orifice and arranged to maintain the pressure drop substantially constant when a predetermined pressure drop has been attained, and second valve means responsive to the pressure intermediate said first and second fixed orifices and arranged when said pressure exceeds a further predetermined value to open a flow path from downstream of said second fixed orifice to a drain. - GB2174515 B A fuel injection pump of the kind specified comprising an adjustable orifice through which fuel can flow to a drain, said adjustable orifice being controlled in accordance with the setting of said means whereby as said means is adjusted to increase the amount of fuel supplied to the associated engine the degree of restriction offered by said adjustable orifice will be decreased, first and second fixed orifices connected in series with said adjustable orifice with the first fixed orifice being positioned immediately downstream of the outlet of the low pressure pump, said fluid pressure operable device being responsive to the pressure intermediate said first and second fixed orifices, first valve means responsive to the pressure drop across said first fixed orifice and arranged to maintain the pressure drop substantially constant when a predetermined pressure drop has been attained, and second valve means responsive to the pressure intermediate said first and second fixed orifices and arranged when said pressure exceeds a further predetermined value to open a flow path from downstream of said second fixed orifice to a drain.