Piston Unit, Top Land Member, and Combination of Piston Unit Parts
Number of patents in Portfolio can not be more than 2000
United States of America
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Issued Date -
Apr 3, 2025
app pub date -
Feb 7, 2023
filing date -
Feb 7, 2023
priority date (Note) -
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status (Latency Note)
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Abstract
A piston unit adapted to reciprocate in a cylinder includes a piston and a top land member attached to the piston. The piston includes a first portion including a piston end at one end surface side and fitted with the top land member. The first portion has a smaller outer diameter than a second portion such that there is a step therebetween. The second portion is the other portion of the piston than the first portion. The top land member has a groove wall forming surface opposed to a step surface that connects the outer circumferential surface of the first portion and the outer circumferential surface of the second portion. The first ring groove is defined by the groove wall forming surface, the step surface, and the outer circumferential surface of the first portion.
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