CLOSED GALLERY PISTON HAVING CON ROD LUBRICATION

• US 20030051694A1
• Filed: 09/19/2001
• Published: 03/20/2003
• Est. Priority Date: 09/19/2001
• Status: Active Grant

• Current Assignee: Federal-Mogul World Wide LLC (Apollo Global Management, Inc.)
• Original Assignee: Federal-Mogul Worldwide Incorporated (Apollo Global Management, Inc.)
• Inventors: Ribeiro, Carmo, Matsuo, Eduardo H., Gaiser, Randall R.
• Granted Patent: US 6,539,910 B1
• Time in Patent Office: Days
• US Class Current: 123/193.6
• CPC Class Codes: F01M 2001/086 for lubricating gudgeon pins
• CPC Class Codes: F02B 23/0672 Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis the surrounding wall being exactly vertical F02B23/0696
• CPC Class Codes: F02B 23/0693 the combustion space consisting of step-wise widened multiple zones of different depth
• CPC Class Codes: F02F 3/003 the parts being connected by casting, brazing, welding or clamping
• CPC Class Codes: F02F 3/22 the fluid being liquid
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A piston for diesel engines includes a piston body having a closed oil gallery and a pair of pin bosses with axially aligned pin bores. The inner faces of the pin bosses are separated from one another by an intervening space between the pin bosses for receiving the upper end of a connecting rod, which has associated outer faces adjacent the inner faces of the pin bosses. Oil passages extend from the gallery and open to the inner faces of the pin bosses for providing direct lubrication to the inner faces.

Claims

1. A piston for diesel engines, comprising:

a piston body having an oil gallery;

a pair of pin bosses having pin bores aligned about a pin bore axis and axially inwardly directed inner faces surrounding said pin bores and separated from one another by an intervening space between said pin bosses for receiving an upper end of a connecting rod; and

at least one oil passage extending from said oil gallery to at least one of said inner faces of said pin bosses to provide direct lubrication of cooling oil thereto.

2. The piston of claim 1 including at least one said oil passage extending from said oil gallery to each of said inner surface of said pin bosses.

3. The piston of claim 1 wherein there are two said oil passages extending from said oil gallery to each of said inner faces of said pin bosses.

4. The piston of claim 3 wherein said oil passages associated with each said inner surface are disposed on opposite sides of said pin bore axis.

5. The piston of claim 1 wherein said inner faces are generally planer.

6. The piston of claim 5 wherein said inner surfaces are non-parallel.

7. The piston of claim 6 wherein said inner surfaces diverge away from said oil gallery.

8. The piston of claim 1 wherein said piston body is fabricated of at least two separate parts which are connected across at least on joint to form said oil gallery.

9. The piston of claim 8 wherein said joint comprises a friction weld joint.