Patent ID: 7334553

Claim:
A balancer driven gear of an engine comprising: a bush member having a boss portion adapted to be fixed to a balancer shaft and a plurality of unevenly spaced outward dowels projecting radially outwardly from an outer periphery of the boss portion; a gear member disposed coaxially with said bush member, said gear member having an annular portion with gear teeth formed on an outer periphery thereof and a plurality of inward dowels projecting radially inwardly from an inner periphery of the annular portion; said bush member and said gear member being assembled in such a manner that said outward and inward dowels are disposed alternately in a peripheral direction of the balancer driven gear; and elastic members respectively provided between selected outward dowels on the bush member and selected inward dowels on the gear member; wherein at least one of the shapes and dimensions of said outward and inward dowels are asymmetric with respect to an axis of the balancer driven gear.