US 12,276,235 B2
Internal combustion engine with reduced oil maintenance
Jacob Zuehl, Hartland, WI (US); Richard Sebzda, Wauwatosa, WI (US); and Vernon Moss, Wauwatosa, WI (US)
Assigned to Briggs & Stratton, LLC, Wauwatosa, WI (US)
Filed by Briggs & Stratton, LLC, Wauwatosa, WI (US)
Filed on Sep. 18, 2023, as Appl. No. 18/369,662.
Application 18/369,662 is a continuation of application No. 17/908,330, granted, now 11,761,402, previously published as PCT/IB2021/051703, filed on Mar. 1, 2021.
Claims priority of provisional application 62/984,234, filed on Mar. 2, 2020.
Prior Publication US 2024/0011452 A1, Jan. 11, 2024
Int. Cl. F02P 1/06 (2006.01); F01L 1/14 (2006.01); F01L 1/18 (2006.01); F01L 3/02 (2006.01); F01P 1/00 (2006.01); F02F 1/00 (2006.01); F02F 3/00 (2006.01); F02F 7/00 (2006.01); F16J 9/28 (2006.01); F16C 7/02 (2006.01)
CPC F02F 7/0085 (2013.01) [F01L 1/146 (2013.01); F01L 1/181 (2013.01); F01L 3/02 (2013.01); F01P 1/00 (2013.01); F02F 1/004 (2013.01); F02F 3/0084 (2013.01); F16J 9/28 (2013.01); F01L 2301/00 (2020.05); F16C 7/023 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An internal combustion engine comprising:
an engine block comprising:
a cylinder block defining a cylinder bore;
a crankcase defining a crankcase chamber with a crankshaft positioned within the crankcase chamber; and
a cylinder sleeve fabricated from a self-lubricating plastic material;
a piston coupled to the crankshaft and slidably arranged within the cylinder sleeve; and
a cylinder head coupled to the cylinder block to form a combustion chamber,
wherein the piston further comprises:
a piston top adjacent the combustion chamber;
a piston body including a wrist pin hole configured to receive a wrist pin;
a first piston ring positioned on the piston body; and
a non-metallic gasket positioned on the piston body closer to the combustion chamber than the first piston ring and structured to prevent combustion gases from escaping the combustion chamber; and
wherein the crankcase chamber is oilless during operation.