A webbed bevel gear in which webs are formed of a minimal size so that the
gear can be downsized, while also improving the mechanical strength of the
gear. The webbed bevel gear is made so as to be capable of avoiding losses
from the webs and so that the strength of the dedendum can be maintained
by the webs, while the strength and the wear resistance of the dedendum
and the tooth surface is further improved. The webbed bevel gears (2,
2a-2c) are constructed as follows: each of the webs is formed with a
concave curved surface defined by the base cone so that it can connect the
two adjacent teeth at the dedendum between the teeth at the radial end of
the gear, the value obtained by dividing the height (h) of the webs in
relation to the module (m) of the gear meets the equation
0.2.ltoreq.h/m.ltoreq.0.6, and the value obtained by dividing the width
(w) of the webs along the generating line of the base cone by the width
(W) of the gear along the generating line of the base pitch cone meets the
equation 0.04.ltoreq.w/W.ltoreq.0.20. A surface treatment, such as
carburizing and/or nitriding is performed in a state in which the webs are
coated with a surface treatment inhibitor, or alternatively, the tooth
surface and the dedendum, except for the webs, are coated with a hard
layer formed of a super hard material.