Patent ID: 7669575
Filing Date: 2010-03-02
Classification: F02B,F16F,Y10T

Abstract:
1. A counterbalancing shaft accommodating structure, comprising: a pair of counterbalancing shafts, provided in an oil pan attached to a lower end portion of an engine; and a housing, adapted to accommodate the counterbalancing shafts in the oil pan, and comprising an upper housing and a lower housing, and an upper-side journal portion and a lower-side journal portion, extending in a direction, which intersects both rotational axes of the counterbalancing shafts at right angles, in the housing, respectively, the upper-side journal portion that supports rotatably the counterbalancing shafts thereabove, the lower-side journal portion that supports rotatably the counterbalancing shafts therebelow, wherein an upper end portion of the upper housing is provided further upwards than the lower end portion of the engine, an opening is formed continuously to expand over both rotational axes of the pair of counterbalancing shafts in an upper surface of the upper housing, the opening is partitioned into at least two areas by the upper-side journal portion, the pair of counterbalancing shafts are provided with a first balancer weight and a second balancer weight, and the upper-side journal portion and the lower-side journal portion support the counterbalancing shafts between the first balancer weight and the second balancer weight.