Method and apparatus for making a two piece unitary piston
First Claim
1. A two piece unitary piston being adapted for use with an engine, said two piece unitary piston comprising:
- a head member being made of a material having a preestablished material strength, having a crown portion to which is connected a ring band portion having a plurality of ring grooves therein, defining a bottom surface being axially positioned below said plurality of ring grooves and having a support portion defining a mating surface having a preestablished surface area;
a skirt member being made of a material having a preestablished material strength being substantially the same as the preestablished material strength of said head member, having a ring band support surface being aligned with the bottom surface and having a top surface being aligned with said mating surface said skirt member being void of a ring groove;
said head member and said skirt member being joined forming said two piece unitary piston, said joining being at the interface of said bottom surface and said mating surface, and said ring band support surface and said top surface respectively; and
said joining being formed by an inertia welding process.
1 Assignment
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Reexamination
Accused Products
Abstract
Past pistons have been susceptible to reduced longevity due to increased forces of combustion thereon during operating cycles of an engine. The present two piece unitary piston increases the longevity of pistons used with increased forces of combustion. For example, a head member has a crown portion defining a ring band portion having a bottom surface and a support portion. And, a skirt member defines a ring band support surface and a top surface. The head member and the skirt member have a preestablished material strength being generally the same. The head member and the skirt member are joined by an inertia welding process. The force of combustion acting on the crown portion is resisted by the ring band support surface being in contacting relationship with the bottom surface. Thus, the skirt member structure supports and resists the bending moment of the combustion forces on the head member.
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Citations
11 Claims
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1. A two piece unitary piston being adapted for use with an engine, said two piece unitary piston comprising:
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a head member being made of a material having a preestablished material strength, having a crown portion to which is connected a ring band portion having a plurality of ring grooves therein, defining a bottom surface being axially positioned below said plurality of ring grooves and having a support portion defining a mating surface having a preestablished surface area; a skirt member being made of a material having a preestablished material strength being substantially the same as the preestablished material strength of said head member, having a ring band support surface being aligned with the bottom surface and having a top surface being aligned with said mating surface said skirt member being void of a ring groove; said head member and said skirt member being joined forming said two piece unitary piston, said joining being at the interface of said bottom surface and said mating surface, and said ring band support surface and said top surface respectively; and said joining being formed by an inertia welding process. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification