US 12,214,458 B2
Piston ring installation jig and piston ring installation method using the jig
Atsushi Tanaka, Tokyo (JP); Manabu Sato, Tokyo (JP); Toshihiko Furukawa, Tokyo (JP); Nanaka Hosoda, Tokyo (JP); Ryuta Shinohara, Tokyo (JP); and Tomoki Kajikawa, Tokyo (JP)
Assigned to SUBARU CORPORATION, Tokyo (JP)
Filed by SUBARU CORPORATION, Tokyo (JP)
Filed on Aug. 23, 2023, as Appl. No. 18/454,295.
Claims priority of application No. 2022-144900 (JP), filed on Sep. 12, 2022.
Prior Publication US 2024/0082965 A1, Mar. 14, 2024
Int. Cl. B23P 19/08 (2006.01); B25B 27/12 (2006.01)
CPC B23P 19/088 (2013.01) [B25B 27/12 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A piston ring installation jig to be used when installing a first piston ring, having a ring gap, in a first ring groove formed in an outer peripheral surface of a piston, the piston ring installation jig comprising
a main body having a first main body portion having a semi-cylindrical shape that is configured for surrounding the outer peripheral surface of the piston,
the first main body portion comprising a first arc shaped groove formed in an inner peripheral surface of the first main body portion in a region located as to correspond to a location of the first ring groove of the piston such that a portion of the first piston ring in a circumferential direction is insertable into the first arc shaped groove, and
the first arc shaped groove defines a circle which has a circle center biased more to an outer peripheral side of the first main body portion than a circle center of the inner peripheral surface of the first main body portion, and wherein
the piston has a second ring groove separated from the first ring groove in an axial direction,
the main body comprises a second main body portion disposed opposing the first main body portion as to form a cylindrical shape,
the first main body portion has the first arc shaped groove in a region corresponding to a location of the first ring groove of the piston, and has a first non-groove-formed portion located in a region corresponding to a location of the second ring groove of the piston, the first non-groove-formed portion being defined by the inner peripheral surface of the first main body portion, and
the second main body portion has a second arc shaped groove located in a region corresponding to a location of the second ring groove of the piston, and has a second non-groove-formed portion located in a region corresponding to a location of the first ring groove of the piston, the second non-groove-formed portion being defined by an inner peripheral surface of the second main body portion.