Patent ID: 11867088
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 10:
11. The turbine blade according to claim 1, wherein
the shank has a front end surface and a rear end surface which are both end surfaces in the extension direction,
on the cross-section of the shank, the first lateral surface includes a first front contour connected to the front end surface, a first rear contour connected to the rear end surface, and a first recess contour that is disposed between the first front contour and the first rear contour and forms the first recess portion,
on the cross-section of the shank, the second lateral surface includes a second front contour connected to the front end surface, a second rear contour connected to the rear end surface, and a second recess contour that is disposed between the second front contour and the second rear contour and forms the second recess portion,
each of the first front contour and the first rear contour overlaps with a linear first reference contour extending along the extension direction of the blade root portion in at least one region including a connection point with the first recess contour,
the first recess contour is disposed on an inner side from the pressure surface side with respect to the first reference contour,
each of the second front contour and the second rear contour overlaps with a linear second reference contour extending along the extension direction of the blade root portion in at least one region including a connection point with the second recess contour, and
the second recess contour is disposed on an inner side from the suction surface side with respect to the second reference contour.