Dual gallery steel piston

Patent metadata

Field	Value
Publication number	US-11067033-B2
Application number	US-201815980595-A
Country	US
Kind code	B2
Filing date	May 15, 2018
Priority date	May 17, 2017
Publication date	Jul 20, 2021
Grant date	Jul 20, 2021

Abstract

A piston capable of operating at a high temperature and consequently contributing to a high in-cylinder temperature, as well as reducing engine oil temperature, when used in an internal combustion engine, is provided. The piston includes an upper portion and a lower portion welded together to present a cooling gallery therebetween. The cooling gallery extends circumferentially around a center axis of the piston and is spaced the center axis. A partition is located in the cooing gallery and extends from one inner surface to another inner surface of the cooling gallery. The partition extends circumferentially around the center axis, and divides the cooling gallery into at least a first gallery portion and a second gallery portion. The partition can be formed as one piece with the upper portion or the lower portion. Alternatively, the partition can be formed as a separate piece from the upper portion and the lower portion.

First claim

The invention claimed is:

1. A piston, comprising:
a body having an upper portion formed of a single piece of material and a lower portion formed of a single piece of material, the upper portion and the lower portion joined to one another and each including inner surfaces forming a cooling gallery therebetween, said cooling gallery extending circumferentially around a center axis of said body and spaced from said center axis, said lower portion including a partition extending into said cooing gallery and having a distal end engaging one of said inner surfaces of said upper portion, said partition extending circumferentially around said center axis, said partition dividing said cooling gallery into at least a first gallery portion and a second gallery portion, and said partition sealing said first gallery portion and said second gallery portion,
wherein said body is formed of steel, said upper portion of said body includes an upper combustion wall, said upper combustion wall presents a combustion bowl surrounded by an outer rim, said upper portion includes an upper outer rib depending from said outer rim of said upper combustion wall, said upper outer rib extends circumferentially around said center axis of said body and is spaced from said center axis of said body, said upper portion includes an upper inner rib depending from said upper combustion wall opposite said combustion bowl, said upper inner rib extends circumferentially around said center axis of said body and is located between said center axis of said body and said upper outer rib, said lower portion of said body includes a lower outer rib extending circumferentially around said center axis of said body and spaced from said center axis of said body, said lower outer rib is welded to said upper outer rib at an outer weld joint, said lower portion of said body includes a lower inner rib extending circumferentially around said center axis of said body and located between said center axis of said body and said lower outer rib, said lower inner rib is welded to said upper inner rib at an inner weld joint, said lower portion includes a lower wall located between said lower outer rib and said lower inner rib, said upper combustion wall includes an upper inner surface located between said upper outer rib and said upper inner rib, said lower wall includes a lower inner surface, said inner ribs present a first inner surface, and said outer ribs present a second inner surface, said inner surfaces face and surround said cooling gallery, and said body includes flash located adjacent said weld joints, and
wherein said partition extends upwardly from said lower wall to said distal end at or adjacent said upper inner surface of said upper combustion wall such that said first gallery portion is located between said partition and said inner ribs and said second gallery portion is located between said outer ribs and said partition, said second gallery portion has a volume larger than a volume of said first gallery portion, said partition has a cylindrical shape, said flash is located along said first weld joint in said first gallery portion and is physically separated from said second gallery portion by said partition, said second gallery portion contains cooling oil, and said first gallery portion contains air.

2. The piston of claim 1 , wherein said upper ribs are friction welded to said lower ribs at said weld joints.

3. The piston of claim 1 , wherein said partition curves to one of said inner surfaces of said upper portion.

4. The piston of claim 1 , wherein said lower portion of said body includes skirt sections depending from said lower outer rib and spaced from one another circumferentially by pin bosses, and each of said pin bosses presents a pin bore.

5. A piston comprising:
a body having an upper portion formed of a single piece of material and a lower portion formed of a single piece of material, the upper portion and the lower portion joined to one another and each including inner surfaces forming a cooling gallery therebetween, said cooling gallery extending circumferentially around a center axis of said body and spaced from said center axis, said lower portion including a partition extending into said cooing gallery and having a distal end engaging one of said inner surfaces of said upper portion, said partition extending circumferentially around said center axis, said partition dividing said cooling gallery into at least a first gallery portion and a second gallery portion, and said partition sealing said first gallery portion and said second gallery portion,
wherein said body is formed of steel, said upper portion of said body includes an upper combustion wall, said upper combustion wall presents a combustion bowl surrounded by an outer rim, said upper portion includes an upper outer rib depending from said outer rim of said upper combustion wall, said upper outer rib extends circumferentially around said center axis of said body and is spaced from said center axis of said body, said upper portion includes an upper inner rib depending from said upper combustion wall opposite said combustion bowl, said upper inner rib extends circumferentially around said center axis of said body and is located between said center axis of said body and said upper outer rib, said lower portion of said body includes a lower outer rib extending circumferentially around said center axis of said body and spaced from said center axis of said body, said lower outer rib is welded to said upper outer rib at an outer weld joint, said lower portion of said body includes a lower inner rib extending circumferentially around said center axis of said body and located between said center axis of said body and said lower outer rib, said lower inner rib is welded to said upper inner rib at an inner weld joint, said lower portion includes a lower wall located between said lower outer rib and said lower inner rib, said upper combustion wall includes an upper inner surface located between said upper outer rib and said upper inner rib, said lower wall includes a lower inner surface, said inner ribs present a first inner surface, and said outer ribs present a second inner surface, said inner surfaces face and surround said cooling gallery, and said body includes flash located adjacent said weld joints, and
wherein said partition extends upwardly from said lower wall and curves to said distal end at or adjacent said first inner surface of said upper inner rib such that said first gallery portion is located between said partition and a portion of said inner ribs and a portion of said lower wall, and said second gallery portion has a volume larger than a volume of said first gallery portion, said flash is located along said first weld joint in said first gallery portion and is physically separated from said second gallery portion by said partition, said lower portion of said body includes an oil inlet to said second gallery portion, said second gallery portion contains cooling oil, and said first gallery portion is sealed and contains air.

6. A piston comprising:
a body having an upper portion formed of a single piece of material and a lower portion formed of a single piece of material, the upper portion and the lower portion joined to one another and each including inner surfaces forming a cooling gallery therebetween, said cooling gallery extending circumferentially around a center axis of said body and spaced from said center axis, said lower portion including a partition extending into said cooing gallery and having a distal end engaging one of said inner surfaces of said upper portion, said partition extending circumferentially around said center axis, said partition dividing said cooling gallery into at least a first gallery portion and a second gallery portion, and said partition sealing said fir

Assignees

• Fed Mogul Llc
• Tenneco Inc

Inventors

• Matsuo Eduardo
• Leibold Andrew
• Vezina Timothy Christopher
• Weinenger Michael
• Wang Kai

Classifications

• F02F3/22

  the fluid being liquid · CPC title

• B23K2101/003

  Pistons · CPC title

• F02F3/18 Primary

  the means being a liquid or solid coolant, e.g. sodium, in a closed chamber in piston · CPC title

• B23K20/12

  the heat being generated by friction; Friction welding · CPC title

• F02F3/003

  the parts being connected by casting, brazing, welding or clamping · CPC title