Abstract: A method for creating a cracking line in a connecting rod includes etching, using a first pass of a laser, a groove in an inner surface of a larger bore of a connecting rod by removing material from the inner surface. The groove may be discontinuous and include a plurality of holes that are spaced apart and have different depths. The method further includes removing more material from the groove using a second pass of the laser to increase the depths of the holes, thereby increasing the stress concentration factor of the groove.

Abstract: An oil separating device is provided in an intake path through which a cavity of a mold and an intake port of a vacuum pump communicate with each other and the oil separating device is configured to separate oil from a combustion gas flowing through the intake path. The oil separating device includes a first tubular body and a spiral plate accommodated in the first tubular body. The spiral plate and the first tubular body define a spiral flow path.

Abstract: A blowby gas processing device including a cylinder block, a cylinder head, a cylinder head cover, an oil separator and a flow velocity amplification device is provided. The cylinder block contains an inter-block passage constituting part of a blowby gas passage passing the blowby gas through in a crank case of an internal combustion engine and introducing the gas into an intake passage of the internal combustion engine. The cylinder head cover contains an in-head passage constituting part of the blowby gas passage provided in at least one of the cylinder head or the cylinder head cover. The oil separator is provided in the inter-block passage and configured to separate and remove oil from the blowby gas. The flow velocity amplification device increases the flow velocity of blowby gas flowing at a bottommost portion provided in the vicinity of the lowest position in the in-head passage.

Abstract: A blowby gas processing device including a cylinder block, a cylinder head, a cylinder head cover, an oil separator and a flow velocity amplification device is provided. The cylinder block contains an inter-block passage constituting part of a blowby gas passage passing the blowby gas through in a crank case of an internal combustion engine and introducing the gas into an intake passage of the internal combustion engine. The cylinder head cover contains an in-head passage constituting part of the blowby gas passage provided in at least one of the cylinder head or the cylinder head cover. The oil separator is provided in the inter-block passage and configured to separate and remove oil from the blowby gas. The flow velocity amplification device increases the flow velocity of blowby gas flowing at a bottommost portion provided in the vicinity of the lowest position in the in-head passage.