Internal combustion engines
AssigneeDavid Brown Tractors Limited
InventorMaurice Jones
Life of this patent
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Abstract
An internal combustion engine of the reciprocating piston type has oil jets for cooling the pistons. The jets are fed by the pump which supplies oil to the engine's lubrication system. A valve in the feed line to the jets is arranged to close automatically when the pressure of oil flowing through it falls below a determined value due to the engine and thus the pump running temporarily at low speed, so as to give priority to the lubrication system at such times.
Claims4
An internal combustion engine, of the type having at least one cylinder in which there is reciprocable a piston, comprising a lubrication system including a pump drawing oil from a sump and delivering it under pressure through a first feed line to the engine's bearings, maximum pressure relief valve means connecting the first feed line directly to the sump, a second feed line connecting the first feed line at a point downstream of the maximum pressure relief valve means to at least one oil jet directed into the or each cylinder for cooling the piston therein, all of the oil flowing through the second feed line returning to the sump by way of the oil jet or jets, and low pressure relief valve means in the second feed line for closing said line to prevent the flow of oil to the oil jet or jets when the pressure acting on the low pressure relief valve means is less than a determined value.
Dependencies are inferred from the claim text.