Filing Information

Inventor(s)	John Haake · Kevin Corgan ·
Assignee(s)	NUVONYX, INC. ·  View assignee updates
Correspondent	MCGINN INTELLECTUAL PROPERTY LAW GROUP, PLLC ·
Application Number	US11892384
Filing date	08/22/2007
Publication date	03/06/2008
Predicted expiration date	08/22/2027
U.S. Classifications	123/18.00R  · 29/888.043  · 148/525  ·
International Classifications	B23K2600  · C21D109  · F01C107  ·
Kind Code	A1

Patent Family

Abstract

A piston having a head includes a circumferential compression ring groove having a top surface, a bottom surface and an inset rear wall extending between the top surface and the bottom surface, wherein a confined area of the compression ring groove is hardened.

Independent Claims | See all claims (20)

1. 1. A piston having a head comprising: a circumferential compression ring groove having a top surface, a bottom surface and an inset rear wall extending between the top surface and the bottom surface, wherein a confined area of said compression ring groove is hardened.
2. 5. A method of forming a piston having a head, comprising: forming a compression ring groove in the head, said compression ring groove having a top surface, a bottom surface and an inset rear wall extending between the top surface and the bottom surface; and hardening a confined area of said compression ring groove using a diode laser.
3. 18. A piston having a head comprising: at least a primary circumferential compression ring groove defined by a top surface, a bottom surface and an inset rear wall extending between the top surface and the bottom surface, wherein a portion of the top surface toward the rear wall is hardened by direct diode laser contact with or without portions of the rear wall being heat treated, with the bottom surface being maintained unhardened by the laser on another landing.
4. 19. A method of hardening a surface of a compression ring groove formed in a piston head comprising the steps of: generating a linearly polarized radiation beam from a laser diode; directing the beam at an angle with respect to radially extending surface of the groove in a manner to create p-polarized radiation; and rotating the piston with respect to the beam to harden the radially extending surface.