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US 2019/0048822 A1Published application
Piston bowl rim with fatigue resistance
AssigneeGM Global Technology Operations LLC
InventorFrancesco GERMANO
Life of this patent
Estimating the term…
Abstract
A piston with an improved bowl geometry includes a piston body having a generally planar crown and a skirt extending from the crown. An oval or multi-lobed bowl rim of a combustion bowl that is recessed in the crown so that the sides of the bowl rim are provided with increased material to resist fatigue along the pin plane, optionally along the thrust/antithrust plane and generally optionally along other planes between the pin plane and the thrust/antithrust plane.
Claims17
A piston for an engine, comprising:
- a piston body having a generally planar crown and a skirt extending from the crown;
- and
- an combustion bowl recessed in the crown and having an oval-shaped bowl rim, wherein the combustion bowl defines an undercut.
A piston for an engine, comprising:
- a piston body having a generally planar crown and a skirt extending from the crown;
- and
- a combustion bowl recessed in the crown and has a bowl rim maximum diameter region and a minimum diameter region that is smaller than the maximum diameter region, the minimum diameter region being along an axis that is parallel to a piston pin axis wherein the crown has increased material on opposite sides of the bowl rim in a direction parallel to the piston pin axis.
A piston for an engine, comprising:
- a piston body having a generally planar crown and a skirt extending from the crown;
- and
- a combustion bowl recessed in the crown and has a bowl rim maximum diameter region and a minimum diameter region that is smaller than the maximum diameter region, the minimum diameter region being along an axis that is parallel to a piston pin axis wherein the crown has increased material on opposite sides of the bowl rim in a direction parallel to the piston pin axis, wherein the bowl rim includes a first pair of lobes defining the minimum diameter region that is along the axis that is parallel to the piston pin axis.
Dependencies are inferred from the claim text.