凸轮轴 Traditional form: 凸輪軸 Pinyin (reading): tūlúnzhóu Definitions: camshaft Characters: 凸 - to protrude, to bulge out; convex 轮 - wheel; to turn, to revolve; to recur 轴 - axle, pivot, shaft; axis Traditional characters: 凸 - to protrude, to bulge out; convex 輪 - wheel; to turn, to revolve; to recur 軸 - axle, pivot, shaft; axis