The invention discloses a
bevel gear with combined arc tooth profile curves and
involute tooth profile curves, wherein the tooth profile curves of the
bevel gear comprise a top convex-arc segment, an
involute segment and a root concave-arc segment, wherein the top convex-arc segment, the
involute segment and the root concave-arc segment are sequentially connected from the top to the root; the top convex-arc segment and the root concave-arc segment are both tangential to the involute segment; and the
radius of the root concave-arc segment is larger than that of the top convex-arc segment. The
bevel gear of the invention has the advantages of separability of center distance of the
involute gear; the bevel gear is simple in manufacturing, convenient in measuring, large in
contact strength of the arc gear, excellent in running-in performance and the like; the contact stress of the gear surface can be largely reduced and the loading ability of the gear surface can be largely improved. In addition, the bevel gear does not have undercutting phenomenon, and the minimum number of teeth can be one, so that the bevel gear has remarkable meaning for realizing light weight of the gear and the transmission device thereof.