| 摘要 |
Cap segment surfaces ( 9 a) and ( 9 b) of a larger-diameter end portion ( 7 ) of a connecting rod ( 5 ) are positioned at an upper and a lower portions of a crank pin ( 8 ) and are inclined from a right upper portion of the larger-diameter end portion ( 7 ) of the connecting rod ( 5 ) to a left lower portion thereof. A cap ( 10 ) is attached by connecting rod bolts ( 11 a) and ( 11 b), head portion ( 12 a) and ( 12 b) of which are arranged vertically along the inclination direction of the cap segment surfaces ( 9 a) and ( 9 b). With a piston ( 24 ) existing at a bottom dead center, a weight connection portion ( 15 a) of an upper rotary balancer ( 4 a) is provided with a recess ( 13 a) at a portion oriented leftwards and downwards which comes to face the head portion ( 12 a) of the upper connecting rod bolt ( 11 a).
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