Steel Piston With Optimized Design
AssigneeKS Kolbenschmidt GmbH
InventorsEmmerich Ottliczky, Gerhard Luz, Eberhard Weiss, Ingo Roth
Life of this patent
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Abstract
A steel piston (1) for a combustion engine, having an upper part in which a ring section (7) with at least one ring groove (8) is arranged, wherein the upper part is adjoined by a lower part that has two opposing skirt wall sections (2), wherein the two skirt wall sections (2) are connected via two mutually opposite case walls (3), wherein a pin bore (4) surrounded by a piston boss (6) is provided in each case wall (3). In one example, there is at least one aperture (14) or at least one recess in the case wall (3) in the region between the piston boss (6) and the skirt wall section (2).
Claims15
A steel piston for use in a combustion engine comprising:
- an upper part in which a ring section with includes at least one ring groove;
- a lower part connected to the upper part, the lower part having two opposite skirt wall sections;
- and
- two mutually opposite case walls connecting the two skirt wall sections, each case wall defining a pin bore surrounded by a piston boss and further defining at least one of at least one aperture or at least one recess positioned in a region around the pin bore.
(canceled)
The method of claim 14 further comprising reworking the piston blank by a machining process.
A method for producing a steel piston for a combustion engine, the piston having an upper part having a ring section including at least one ring groove, a lower part connected to the upper part and having two opposite skirt wall sections, and two mutually opposing case walls connecting the skirt wall sections, each case wall having a pin boss defining a pin bore, the method comprising:
- implementing through a material displacement process in a piston blank for the steel piston at least one of:
- at least one recess or at least one aperture in a region around the respective pin bore;
- the two case walls positioned at an angle alpha relative to a piston stroke axis;
- an excavation groove positioned in a pin surface of the respective pin bore;
- a recess extending from the excavation groove towards at least one end of the respective pin bore;
- or
- a recess extending from the at least one ring groove in one of an upward or downward direction relative to the piston stroke axis.
Dependencies are inferred from the claim text.