Nozzle for cooling engine pistons

Patent metadata

Field	Value
Publication number	US-11300019-B2
Application number	US-201716616695-A
Country	US
Kind code	B2
Filing date	Jul 7, 2017
Priority date	Jul 7, 2017
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

The present invention relates to a cooling jet nozzle (10) for an engine piston. The nozzle (10) comprises a cooling stream pathway (14), in which the internal cross-sectional dimensions of the pathway vary along the length of the pathway; and a plunger (28) located within the cooling stream pathway to impinge a cooling feedstream received within the pathway to provide a cooling jet. The plunger (28) is axially moveable within the pathway to adjust the internal cross-sectional dimensions of the cooling jet.

First claim

The invention claimed is:

1. A cooling jet nozzle for an engine piston, in which the cooling jet nozzle comprises: a cooling stream pathway, in which internal cross-sectional dimensions of the pathway vary along a length of the pathway; and a plunger located within the cooling stream pathway to impinge a cooling feedstream received within the pathway to provide a cooling jet, characterized in that the plunger is axially moveable in order to adjust the internal cross-sectional dimensions of the cooling jet;
wherein
the cooling stream pathway is provided by a first cylindrical pathway portion in communication with a second cylindrical pathway portion, in which the second cylindrical pathway portion provides a jet nozzle outlet, the plunger is moveable between a first open position in which the plunger is located within the first cylindrical pathway portion to provide a first cooling jet, and a second open position in which the plunger is at least partially engaged within the second cylindrical pathway portion to provide a second cooling jet stream,
wherein the plunger has a first axial end located on a side of the jet nozzle outlet; the jet nozzle outlet has an inside diameter, and in the second open position of the plunger, said first axial end is located at a distance from the jet nozzle outside outlet that is less than one-half of said inside diameter, said distance is inferior to one-quarter of said inside diameter wherein said distance is measured in a direction of flow of the cooling jet.

2. A nozzle as claimed in claim 1 , characterized in that the plunger is located at or adjacent the jet nozzle outlet.

3. A nozzle as claimed in claim 1 , characterized in that the plunger is located substantially centrally between opposing walls forming the pathway.

4. A nozzle as claimed in claim 1 , characterized in that the plunger is axially moveable in a direction extending substantially parallel to the direction of flow of the cooling feedstream.

5. A nozzle as claimed in claim 1 , characterized in that the plunger is moveable between a first open position to provide a first cooling jet having a first internal cross-sectional dimension, and at least a second open position to provide a second cooling jet having a second internal cross-sectional dimension, and in which the first internal cross-sectional dimension is greater than the second internal cross-sectional dimension.

6. A nozzle as claimed in claim 5 , characterized in that the plunger is resiliently biased towards the first open position.

7. A nozzle as claimed in claim 6 , characterized in that the nozzle further comprises a resilient biasing member arranged to resiliently bias the plunger in a direction towards the first open position.

8. A nozzle as claimed in claim 1 , characterized in that the first cylindrical pathway portion has a first internal cross-sectional dimension, and in which the second cylindrical pathway portion has a second internal cross-sectional dimension, in which the first internal cross-sectional dimension is greater than the second internal cross-sectional dimension.

9. A nozzle as claimed in claim 8 , characterized in that the first cooling jet has a first internal cross-sectional dimension within the second cylindrical pathway portion, the second cooling jet stream has a second internal cross-sectional dimension within the second cylindrical pathway portion, in which the first internal cross-sectional dimension is greater than the second internal cross-sectional dimension.

10. A nozzle as claimed in claim 9 , characterized in that in the second open position, the plunger is totally engaged within the second cylindrical pathway to provide the second cooling jet stream.

11. A nozzle according to claim 9 , characterized in that, in the second open position of the plunger, at least a portion of the plunger having the greatest outside diameter is engaged within the second cylindrical pathway.

12. A nozzle as claimed in claim 1 , characterized in that cross-sectional dimensions of the plunger increase in a direction extending substantially parallel to the direction of flow of the cooling jet.

13. A nozzle as claimed in claim 1 , characterized in that the nozzle is an oil jet nozzle.

14. An engine comprising at least one engine piston and at least one nozzle as claimed in claim 1 , in which each piston is in communication with a cooling jet outlet of a nozzle.

15. A method for providing a cooling jet having a predetermined speed and/or pressure characterized by the steps of: feeding a cooling stream into the cooling stream pathway of a nozzle as claimed in claim 1 ; and generating a cooling jet having a predetermined speed within the pathway of the nozzle, in which the cooling jet has an internal cross-sectional dimension which is dependent on the location of the plunger within the pathway.

16. A method for cooling at least one engine piston characterized ley the steps of: feeding a cooling stream into the cooling stream pathway of a nozzle as claimed in claim 1 ; generating a cooling jet having a predetermined speed and/or pressure within the pathway of the nozzle, in which the cooling jet has an internal cross-sectional dimension which is dependent on the location of the plunger within the pathway; and using the cooling jet having a predetermined speed and/or pressure to cool at least one engine piston.

Assignees

• Volvo Truck Corp

Inventors

• Granottier Nicolas
• Cuinier Catherine

Classifications

• F01M2001/083

  for lubricating cylinders · CPC title

• F01P3/08

  Cooling of piston exterior only, e.g. by jets · CPC title

• F01M2001/086

  for lubricating gudgeon pins · CPC title

• F01P3/10 Primary

  Cooling by flow of coolant through pistons · CPC title

• F01M1/08 Primary

  Lubricating systems characterised by the provision therein of lubricant jetting means · CPC title