US Patent 11131201 Rotor blade, rotor unit, and rotating machine

In a rotating machine, a tip shroud of a rotor blade includes a plurality of shroud outer peripheral surfaces which are provided such that radial positions of the shroud outer peripheral surfaces are located stepwise radially outward from an upstream side toward a downstream side, and a step portion which connects adjacent shroud outer peripheral surfaces to each other. The step portion includes an acute angle-forming surface which extends toward the upstream side while extending toward a radially outer side and is connected to an upstream-side end portion of the shroud outer peripheral surface located on the downstream side with an acute angle θ1.