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

• US 20150336223A1
• Filed: 08/04/2015
• Published: 11/26/2015
• Est. Priority Date: 09/27/2012
• Status: Active Grant

• Current Assignee: Federal-Mogul, LLC (Apollo Global Management, Inc.)
• Original Assignee: Federal-Mogul Corporation (Apollo Global Management, Inc.)
• Inventors: AZEVEDO, MIGUEL, WEINENGER, MICHAEL
• Granted Patent: US 10,065,276 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 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.

2. The method of claim 1 further including forming at least one support extending between the undercrown surface and an upper surface of the floor.

3. The method of claim 2 further including forming the at least one support along a central longitudinal axis of the piston head.

4. The method of claim 2 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.

5. The method of claim 4 further including forming an opening extending through the floor, wherein the opening is centrally located along a central longitudinal axis of the piston head.

6. The method of claim 1 further including forming the piston head having a top part and a bottom part and bonding the top part to the bottom part.

7. The method of claim 1 further including forming an outlet lubrication port extending out of the cooling gallery in tangential relation with the pin.

8. The method of claim 1 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.

9. The method of claim 1 further including forming the cooling gallery as a completely closed cooling gallery.

10. The method of claim 9 further including providing a coolant within the completely closed cooling gallery.