Abstract: A gas turbine includes a blade ring which faces blades from the outer side in a radial direction perpendicular to a turbine shaft, and a channel provided in the blade ring 1 and through which a cooling medium is flowed. The channel includes an inner channel formed in the blade ring 1, and a tubular outer channel which is connected to the inner channel, is disposed in an outer portion of the blade ring 1, and extends in a circumferential direction of the blade ring 1. The outer channel includes a plurality of fixing portions fixed to the blade ring 1 and a thermal stress absorbing portion disposed between the fixing portions adjacent in the circumferential direction and expandable and contractible in the circumferential direction.

Abstract: A structure that mounts to a rotation shaft a lever that causes this rotation shaft to rotate, including a plurality of engaging members that are provided in the lever so as to be offset from the center axis of the rotation shaft, and that are capable of advancing toward and retracting from the outer periphery of the rotation shaft, and a plurality of abutted faces that are provided on the outer periphery of the rotation shaft so that the distal end faces of the plurality of engaging members respectively make contact, in which, when at least one of the engaging members and the abutted face that corresponds to that engaging member are in contact, relative rotation of the rotation shaft about the axis thereof in one direction with respect to the lever is restricted, and when another engaging member and another abutted face corresponding to the engaging member are in contact, relative rotation of the rotation shaft about the axis thereof in the other direction with respect to the lever is restricted.

Abstract: A gas turbine includes a blade ring which faces blades from the outer side in a radial direction perpendicular to a turbine shaft, and a channel provided in the blade ring 1 and through which a cooling medium is flowed. The channel includes an inner channel formed in the blade ring 1, and a tubular outer channel which is connected to the inner channel, is disposed in an outer portion of the blade ring 1, and extends in a circumferential direction of the blade ring 1. The outer channel includes a plurality of fixing portions fixed to the blade ring 1 and a thermal stress absorbing portion disposed between the fixing portions adjacent in the circumferential direction and expandable and contractible in the circumferential direction.

Abstract: A structure that mounts to a rotation shaft a lever that causes this rotation shaft to rotate, including a plurality of engaging members that are provided in the lever so as to be offset from the center axis of the rotation shaft, and that are capable of advancing toward and retracting from the outer periphery of the rotation shaft, and a plurality of abutted faces that are provided on the outer periphery of the rotation shaft so that the distal end faces of the plurality of engaging members respectively make contact, in which, when at least one of the engaging members and the abutted face that corresponds to that engaging member are in contact, relative rotation of the rotation shaft about the axis thereof in one direction with respect to the lever is restricted, and when another engaging member and another abutted face corresponding to the engaging member are in contact, relative rotation of the rotation shaft about the axis thereof in the other direction with respect to the lever is restricted.