Timothy H Andros

20130154196, Jun 20, 2013

Dec 4, 2012

13/693472

Mahle International GmbH - Stuttgart, DE
Timothy Andros - Fowler MI, US
Robert J. Piccard - St. Johns MI, US

B23P 15/06
F16J 9/00

277434, 29888075, 29888074

A piston ring is formed from a ring blank, e.g., a wire, that has a cross sectional profile including upper and lower surfaces that are generally parallel and disposed between inner and outer peripheral faces. The cross sectional profile also includes a hook area at the outer portion of the lower surface that includes a nose area. The nose area is provided with a radius that is as sharp as possible, and is disposed such that a grinding operation performed on the lower surface, e.g., with a single generally planar grinding surface, will also grind the nose area, thereby truncating the nose area and increasing sharpness of the nose area without having to perform additional machining operations.

20170108122, Apr 20, 2017

Oct 12, 2016

15/291427

- Stuttgart, DE
Alexander S. Cooper - Maple Rapids MI, US
Robert J. Piccard - St. Johns MI, US
Timothy Andros - Fowler MI, US
Claudinei J. de Oliveira - St. Johns MI, US
Jason P. Bieneman - Ann Arbor MI, US
Victor H. Tapia Ramirez - Aguascalientes, MX
Terry Pecott - Whitehall MI, US

Mahle International GmbH - Stuttgart

F16J 9/26
B23P 15/06

A method of forming a piston ring includes providing a base portion formed of a metallic material, the base portion having a first surface, and a second surface that is opposite the first surface, the base portion configured to interface with a piston ring groove. The method includes grinding the first surface to form a reference surface, applying a chromium layer to the second surface, and grinding the chromium layer to reduce a surface roughness of the chromium layer.