Lubrication system for an internal combustion engine
AssigneeDAF Trucks N.V.
InventorBart Adrianus Simon VEEKE
Life of this patent
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Abstract
In one aspect, a lubrication system according to the present invention is characterized by a lubrication system for an internal combustion engine, comprising a pressure less lubricant collection chamber; a lubricant pump having a pump inlet fluidly coupled to the collection chamber; and a pump outlet fluidly coupled to a lubricant filter module. A control valve is provided with a bias member. The control valve is controlled by a terminal pressure derived from the lubricant gallery against a bias force provided by the bias member, so that in case of under pressure of the lubricant gallery the bias member actuates the control valve to return to its normally open condition.
Claims6
1:
- A lubrication system for an internal combustion engine, comprising a pressure less lubricant collection chamber;
- a lubricant pump having a pump inlet fluidly coupled to the collection chamber;
- and a pump outlet fluidly coupled to a lubricant gallery being fluidly connected to selective engine parts to be lubricated;
- wherein said lubricant pump further comprises a pilot pressure control line;
- said pilot pressure control line controlling the pump between a maximum output at low pilot pressure and a minimum output at high pilot pressure;
- said pilot pressure line in fluid connection with the lubricant gallery via a regulating valve, that controls a pressurized lubricant flow from the gallery to the pilot pressure control line;
- wherein a control valve is provided with a bias member, said control valve controlled by a terminal pressure derived from the lubricant gallery against a bias force provided by the bias member, so that in case of under pressure of the lubricant gallery the bias member actuates the control valve to return to its normally open condition;
- thereby allowing fluid flow between the pilot pressure line and the collection chamber to increase the pumps output until a minimum set pressure is reached in the lubricant gallery in accordance with the bias force provided by the bias member;
- in which case the control valve is kept in closed condition so that the pilot pressure can regulate the lubricant pump.
2:
- The lubrication system according to claim 1, said lubricant pump further comprising a safety pressure relieve valve and said safety valve in fluid connection with the collection chamber;
- said return line fluidly connecting the pump outlet via a first overpressure valve for directing overpressure to the collection chamber.
3:
- The lubrication system according to claim 1, wherein a second overpressure valve is provided between the pump outlet and the pilot pressure line that in case of overpressure provides a lubricant flow from the pump outlet to the pilot pressure line additional to the pressurized lubricant flow from the regulating valve, to provide a maximum flow rate through the second overpressure valve that is higher than a pump leakage flow rate.
4:
- The lubrication system according to claim 1, wherein the control valve is passive.
5:
- The lubrication system according to claim 1, wherein the lubricant pump is powered by the internal combustion engine.
6:
- The lubrication system according to claim 1, wherein the lubricant pump comprises a displaceable pump rotor, wherein the pump rotor displacement is controlled by the pilot pressure control line via a hydraulic displacement actuator.