REDUCED COMPRESSION HEIGHT PISTON AND PISTON ASSEMBLY THEREWITH AND METHODS OF CONSTRUCTION THEREOF

• US 20140083390A1
• Filed: 09/27/2013
• Published: 03/27/2014
• Est. Priority Date: 09/27/2012
• Status: Active Grant

• Current Assignee: Tenneco Incorporated (Apollo Global Management, Inc.)
• Original Assignee: Federal-Mogul Corporation (Apollo Global Management, Inc.)
• Inventors: Azevedo, Miguel, Weinenger, Michasel
• Granted Patent: US 9,127,618 B2
• Time in Patent Office: Days
• US Class Current: 123/193.6
• CPC Class Codes: B23P 15/08 piston rings from several pieces
• CPC Class Codes: F02F 2200/00 Manufacturing
• CPC Class Codes: F02F 3/00 Pistons
• CPC Class Codes: F02F 3/0069 the crown and skirt being interconnected by the gudgeon pin
• CPC Class Codes: F02F 3/16 having cooling means
• CPC Class Codes: F16J 1/005 obtained by assembling several pieces
• CPC Class Codes: F16J 1/09 with means for guiding fluids F16J1/08 takes precedence
• CPC Class Codes: F16J 1/16 with gudgeon-pin; Gudgeon-pins
• CPC Class Codes: F16J 7/00 Piston-rods
• CPC Class Codes: Y10T 29/49249 Piston making
• CPC Class Codes: Y10T 29/49268 with other attaching provision for connecting rod

Abstract

A piston assembly and method of construction thereof for an internal combustion engine are provided. The assembly includes a piston head having an upper combustion wall with an undercrown surface and a ring belt region. The piston head has a floor with an upper surface and a bottom surface. The floor is spaced beneath the upper combustion wall in radial alignment with the ring belt region. A substantially enclosed, annular cooling gallery is bounded by the undercrown surface and the floor. A pair of pin bores depends directly from the floor of the cooling gallery. The assembly further includes a pin having ends configured for oscillating receipt in the pin bores. A pin bearing surface extends within the pin bores and between the pin bores in the lower surface of the floor. The assembly includes a connecting rod with an end fixed to the pin for conjoint oscillation therewith.

Claims

1. A piston assembly for an internal combustion engine, comprising:

a piston head having an upper combustion wall with an undercrown surface and a ring belt region depending from said upper combustion wall, a floor having an upper surface and a bottom surface, said floor being spaced beneath said upper combustion wall in radial alignment with said ring belt region, a substantially enclosed, annular cooling gallery bounded by said undercrown surface and said floor, said cooling gallery extending radially inwardly from said ring belt region;

a pair of pin bores depending directly from the floor of the cooling gallery;

a pin having ends configured for oscillating receipt in the pin bores;

a pin bearing surface extending within said pin bores and between said pin bores in said lower surface of said floor; and

a connecting rod having an end fixed to the pin for conjoint oscillation therewith.

2. The piston assembly of claim 1 further comprising at least one support extending between the undercrown surface and said upper surface of said floor.

3. The piston assembly of claim 2 wherein said at least one support member extends along a central longitudinal axis of said piston head.

4. The piston assembly of claim 2 wherein said at least one support member includes a plurality of support members extending radially outwardly from a central longitudinal axis of said piston head.

5. The piston assembly of claim 4 further including an opening extending through said floor, said opening being centrally located along a central longitudinal axis of said piston head.

6. The piston assembly of claim 1 wherein said piston head includes a top part and a bottom part, said top part having an annular first upper joining surface depending from said upper combustion surface and a second joining surface depending from said upper combustion surface along a central longitudinal axis of the piston, said bottom part including an annular lower joining surface extending upwardly from said floor, said lower joining surface being bonded to said first upper joining surface at a first bond joint and an upper surface of said floor being bonded to said second joining surface at a second bond joint.

7. The piston assembly of claim 1 further including an inlet lubrication feed port extending into said cooling gallery and an outlet lubrication feed port extending out of said cooling gallery in tangential relation with said pin.

8. The piston assembly of claim 1 wherein said pin has a through hole and said connecting rod has an oil passage aligned with said through hole for oil flow through said connecting rod into said wrist pin and into contact with said pin bearing surface.

9. The piston assembly of claim 8 wherein said through hole extends through a diameter of said pin.

10. The piston assembly of claim 9 wherein said oil passage extends over a length of said connecting rod.

11. The piston assembly of claim 1 wherein said cooling gallery is closed.

12. The piston assembly of claim 11 wherein said cooling gallery contains a coolant.

13. The piston assembly of claim 12 wherein said coolant is a high thermal conductivity metal-containing composition.

14. A piston for an internal combustion engine, comprising:

a piston head having an upper combustion wall with an undercrown surface and a ring belt region depending from said upper combustion wall, a floor having an upper surface and a bottom surface, said floor being spaced beneath said upper combustion wall in radial alignment with said ring belt region, a substantially enclosed, annular cooling gallery bounded by said undercrown surface and said floor, said cooling gallery extending radially inwardly from said ring belt region;

a pair of pin bores depending directly from the floor of the cooling gallery; and

a pin bearing surface extending within said pin bores and between said pin bores on said lower surface of said floor.

15. The piston of claim 14 further comprising at least one support extending between the undercrown surface and said upper surface of said floor.

16. The piston of claim 15 wherein said at least one support member extends along a central longitudinal axis of said piston head.

17. The piston of claim 15 wherein said at least one support member includes a plurality of support members extending radially outwardly from a central longitudinal axis of said piston head.

18. The piston of claim 17 further including an opening extending through said floor, said opening being centrally located along a central longitudinal axis of said piston head.

19. The piston of claim 14 wherein said piston head includes a top part and a bottom part, said top part having an annular first upper joining surface depending from said upper combustion surface and a second joining surface depending from said upper combustion surface along a central longitudinal axis of the piston, said bottom part including an annular lower joining surface extending upwardly from said floor, said lower joining surface being bonded to said first upper joining surface at a first bond joint and an upper surface of said floor being bonded to said second joining surface at a second bond joint.

20. The piston of claim 14 wherein said cooling gallery is closed.

21. The piston of claim 20 wherein said cooling gallery contains a coolant.

22. The piston of claim 21 wherein said coolant is a high thermal conductivity metal-containing composition.

23. A method of constructing a piston assembly for an internal combustion engine, comprising:

forming a piston head having an upper combustion wall with an undercrown surface and a ring belt region depending from said upper combustion wall and having a floor spaced beneath the upper combustion wall in radial alignment with the ring belt region, with a substantially enclosed, annular cooling gallery bounded by the undercrown surface and the floor;

forming a pair of pin bores extending directly from the floor of the cooling gallery;

forming a pin bearing surface extending within the pin bores and between the pin bores within a lower surface of the floor;

inserting a pin for oscillating receipt in the pin bores; and

fixing an end of a connecting rod directly to the pin for conjoint oscillation therewith.

24. The method of claim 23 further including forming at least one support extending between the undercrown surface and an upper surface of the floor.

25. The method of claim 24 further including forming the at least one support along a central longitudinal axis of the piston head.

26. The method of claim 24 further including forming the at least one support member as a plurality of support members extending radially outwardly from a central longitudinal axis of the piston head.

27. The method of claim 26 further including forming an opening extending through the floor, wherein the opening is centrally located along a central longitudinal axis of the piston head.

28. The method of claim 23 further including forming the piston head having a top part and a bottom part and bonding the top part to the bottom part.

29. The method of claim 23 further including forming an outlet lubrication port extending out of the cooling gallery in tangential relation with the pin.

30. The method of claim 23 further including forming a through hole in the pin and forming an oil passage in the connecting rod and aligning the oil passage with the through hole to allow oil flow through the connecting rod and through the wrist pin into contact with the pin bearing surface.

31. The method of claim 23 further including forming the cooling gallery as a completely closed cooling gallery.

32. The method of claim 31 further including providing a coolant within the completely closed cooling gallery.