| 摘要 |
The present disclosure generally relates to an internal combustion engine (1) comprising a cylinder (2) a piston (30) reciprocally movable within the cylinder (2) between a top dead center (TDC) and a bottom dead center (BDC). The piston (30) may separate the cylinder (2) into an upper piston section (40) and a lower piston section (42), and may include at least one piston ring (32, 34) configured to sealingly contact the cylinder (2) having spaced a piston ring thickness (D). The internal combustion engine (1) may further comprise an annular crevice (18) being in fluid communication with the upper piston section (40) and being defined by the cylinder (2), the piston (30), and the at least one piston ring (32), and a plurality of venting grooves (14, 16) vertically disposed in the cylinder (2) and each having a length (L) being greater than the piston ring thickness (D), wherein the plurality of venting grooves (14, 16) is configured and positioned to fluidly connect the annular crevice (18) with the lower piston section (42), only when the piston (30) has a position corresponding to a crank angle range of about 85° to 95° and about 265° to 275° after the top dead center (TDC). |
