Back to results
US 12,241,405 B2Granted
Internal combustion engine and cylinder block
AssigneeIsuzu Motors Limited
InventorYasuhiro Ishikawa
Life of this patent
Estimating the term…
Abstract
An internal combustion engine to reduce abrasion with a piston while retaining oil film on an upper portion of a cylinder includes: a cylinder block that includes a cylinder, and a piston that is stored in the cylinder in a manner capable of reciprocating along an axis line of the cylinder, in which the cylinder includes a multi-bulging inner circumference portion in which a diameter in a thrust-anti thrust direction is a minimal diameter.
Claims4
An internal combustion engine, comprising:
- a cylinder block that includes a cylinder;
- and
- a piston that is stored in the cylinder in a manner capable of reciprocating along an axis line of the cylinder,
- wherein
- the cylinder includes a multi-bulging inner circumference portion in which a diameter in a thrust-anti thrust direction is a minimal diameter, the multi-bulging inner circumference portion including multiple bulging portions that bulge outward relative to an outer diameter of a virtual cylinder having a perfect circular shape through which the piston passes;
- the multi-bulging inner circumference portion is positioned below a position at which a maximal side thrust is received in the cylinder during combustion and expansion strokes;
- and
- the bulging portions are parts having major diameters longer than the minimal diameter and gradually increase downward from the position.
5 more elements
A cylinder block, comprising a cylinder that stores therein a piston such that the piston is capable of reciprocating therein,
- wherein the cylinder includes a multi-bulging inner circumference portion in which a diameter in a thrust-anti thrust direction is a minimal diameter, the multi-bulging inner circumference portion including multiple bulging portions that bulge outward relative to an outer diameter of a virtual cylinder having a perfect circular shape through which the piston passes;
- the multi-bulging inner circumference portion is positioned below a position at which a maximal side thrust is received in the cylinder during combustion and expansion strokes;
- and
- the bulging portions are parts having major diameters longer than the minimal diameter and gradually increase downward from the position.
1 more element
Dependencies are inferred from the claim text.