# US 2018/0306320 A1 · Piston > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0306320 A1 - Document ID: US20180306320A1 - Status: Published application - Kind: A1 - Application number: 15/769,336 - Filed: 2016-10-04 - Published: 2018-10-25 - Earliest claimed: 2015-10-19 - Assignees: Mahle International GmbH - Applicants: Mahle International GmbH - Inventors: Rudi Juergen; Ralf Braig - Web page: https://patentgrep.com/patent/US20180306320A1 ## CPC - F16J 1/16: with gudgeon-pin; Gudgeon-pins - F02F 3/02: having means for accommodating or controlling heat expansion - F02F 3/022: {the pistons having an oval circumference or non-cylindrical shaped skirts, e.g. oval (F02F3/025, F02F3/027 take precedence)} - F16C 33/1065: {Grooves on a bearing surface for distributing or collecting the liquid} - F02F 3/00: Pistons - F02F 3/0015: {Multi-part pistons} - F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS - F02F: CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS ## Abstract A piston for an internal combustion engine may include two pin bosses configured to receive a gudgeon pin. The two pin bosses may respectively include a nadir pocket of at least two nadir pockets at α=180° and extending outward from a piston axis. The at least two nadir pockets may have a respective length that is smaller than a length of a respective pin boss of the at least two pin bosses. The piston may also include a pin boss axis that is axially offset from the piston axis by 0.1-1.0 mm. ## Claims ### Claim 1 A piston for an internal combustion engine, comprising two pin bosses configured to receive a gudgeon pin, the two pin bosses respectively including a nadir pocket of at least two nadir pockets at α=180° and extending outward from a piston axis, the at least two nadir pockets having a respective length that is smaller than a length of a respective pin boss of the at least two pin bosses, wherein a pin boss axis is axially offset from the piston axis by 0.1-1.0 mm. ### Claim 2 (depends on 1) The piston as claimed in claim 1, wherein the respective length of the at least two nadir pockets is 10-75% of the length of the respective pin boss. ### Claim 3 (depends on 1) The piston as claimed in claim 1, wherein the at least two nadir pockets have a depth from 0.1 to 1.0 mm. ### Claim 4 (depends on 1) The piston as claimed in claim 1, wherein a depth of the at least two nadir pockets decreases along the piston axis in a direction extending away from a central axis, the central axis disposed between the two pin bosses and extending perpendicular to the piston axis. ### Claim 5 (depends on 1) The piston as claimed in claim 1, wherein the two pin bosses are configured as one of symmetrically shaped pin bores and asymmetrically shaped pin bores. ### Claim 6 (depends on 1) The piston as claimed in claim 1, wherein the at least two nadir pockets extend over a circumferential angle of 30° to 130°. ### Claim 7 (depends on 1) The piston as claimed in claim 1, wherein the two pin bosses have at least one of a superimposed transverse ovality and a vertical ovality. ### Claim 8 (depends on 1) The piston as claimed in claim 1, wherein the two pin bosses include oil pockets. ### Claim 9 (depends on 1) The piston as claimed in claim 1, wherein the two pin bosses include a circumferential lubricating groove. ### Claim 10 (depends on 8) The piston as claimed in claim 8, wherein the oil pockets are at least one of i) narrow straight oil pockets, ii) large straight oil pockets, and iii) oblique large oil pockets. ### Claim 11 (depends on 2) The piston as claimed in claim 2, wherein the at least two nadir pockets have a depth from 0.1 to 1.0 mm. ### Claim 12 (depends on 11) The piston as claimed in claim 11, wherein the depth of the at least two nadir pockets decreases along the piston axis in a direction extending away from a central axis, the central axis disposed between the two pin bosses and extending perpendicular to the piston axis. ### Claim 13 (depends on 12) The piston as claimed in claim 12, wherein the at least two nadir pockets extend over a circumferential angle of 30° to 130°. ### Claim 14 A piston for an internal combustion engine, comprising two pin bosses configured to receive a gudgeon pin, the two pin bosses respectively including a nadir pocket of at least two nadir pockets at α=180° and extending outward from a piston axis, the at least two nadir pockets having a respective length that is smaller than a length of a respective pin boss of the at least two pin bosses, the at least two nadir pockets having a depth from approximately 0.1 to 1.0 mm, the depth of the at least two nadir pockets decreasing along the piston axis in a direction extending away from a central axis, the central axis disposed between the two pin bosses and extending perpendicular to the piston axis, wherein a pin boss axis is axially offset from the piston axis by 0.1 to 1.0 mm, the pin boss axis and the piston axis extending perpendicular to the central axis. ### Claim 15 (depends on 14) The piston as claimed in claim 14, wherein the two pin bosses are configured as one of symmetrically shaped pin bores and asymmetrically shaped pin bores. ### Claim 16 (depends on 14) The piston as claimed in claim 14, wherein the at least two nadir pockets extend over a circumferential angle of 30° to 130°. ### Claim 17 (depends on 14) The piston as claimed in claim 14, wherein the two pin bosses each include at least one oil pocket and a circumferential lubricating groove. ### Claim 18 A piston for an internal combustion engine, comprising two pin bosses configured to receive a gudgeon pin, the two pin bosses having at least one of a superimposed transverse ovality and a vertical ovality and respectively including a nadir pocket of at least two nadir pockets at α=180° and extending outward from a piston axis, the at least two nadir pockets extending over a circumferential angle of 30° to 130° and having a respective length that is smaller than a length of a respective pin boss of the at least two pin bosses, the at least two nadir pockets having a depth from approximately 0.1 to 1.0 mm, the depth of the at least two nadir pockets decreasing along the piston axis in a direction extending away from a central axis, the central axis disposed between the two pin bosses and extending perpendicular to the piston axis, wherein a pin boss axis is axially offset from the piston axis by 0.1 to 1.0 mm, the pin boss axis and the piston axis extending perpendicular to the central axis. ### Claim 19 (depends on 18) The piston as claimed in claim 18, wherein the nadir pocket extends across approximately 10% to 75% a length from the proximal edge to the distal edge. ### Claim 20 (depends on 19) The piston as claimed in claim 19, wherein the two pin bosses are configured as one of symmetrically shaped pin bores and asymmetrically shaped pin bores.