Back to results
US 11,649,757 B2Granted
Passive piston cooling nozzle control with low speed hot running protection
AssigneeCummins Inc.
InventorsJames A. Dods, Nathaniel P. Hassall, Adam C. Cecil, Aaron S. Quinton
Life of this patent
Estimating the term…
Abstract
Systems and devices are disclosed for controlling fluid flow to piston cooling nozzles with a fluid flow control device configured to open when an internal combustion engine requires piston cooling at high speed but remains open for a period of time after the engine speed drops below a threshold to prevent heat soak damage to the pistons.
Claims20
A piston cooling system for an internal combustion engine, comprising:
- a reservoir from which fluid is fed;
- a piston cooling nozzle (PCN) coupled to the reservoir and configured to direct the fluid fed from the reservoir for spraying the fluid onto a piston in the engine;
- and
- a fluid flow control device connecting the reservoir and the PCN, the fluid flow control device having a first chamber that opens to allow the fluid to pass from the reservoir to the PCN in response to at least one of an engine speed and an air pressure exceeding a first threshold, the fluid flow control device including a second chamber in fluid communication with the first chamber for receiving fluid fed from the first chamber through a check valve between the first and second chambers in response to the fluid flow control device being opened, wherein at least one of the fluid flow control device and the check valve includes a clearance to bleed fluid from the second chamber into the reservoir to delay a closing of the fluid flow control device for a predetermined period of time in response to the one of the engine speed and the air pressure dropping below the first threshold.
1 more element
A piston cooling nozzle device for controlling a flow fluid used for cooling pistons in an internal combustion engine, comprising:
- a fluid flow control device having a first chamber and a second chamber for housing fluid and configured to control the fluid flow between the first and second chambers, the fluid flow control device including a check valve between the first and second chambers to regulate fluid flow from the first chamber into the second chamber to open a fluid flow path to the piston cooling nozzle in response to one of an engine speed and an air pressure being above a threshold, wherein the fluid flow control device includes a clearance to bleed fluid from the second chamber into the first chamber to delay a closing of the fluid flow path in response to the one of the engine speed and the air pressure dropping from below the threshold.
Dependencies are inferred from the claim text.