Hitachi Construction Machinery Co., Ltd.

National Institute for Materials Science

Susumu Meguro

Mitsuhiro Yoshimoto

Terumi Nakamura

Yoshitaka Matsushita

Masao Hayakawa

Takanobu Hiroto

Norihito Hata

Seisuke Nigo

Seiichi Kato

Tomohisa Kanazawa

Provided is a reusability determination method for a gear that makes it possible to determine reusability of a gear during or after use to increase the reuse ratio. The reusability determination method for a gear of the present invention includes a step of measuring a content of retained γ phases in the gear, a step of calculating a change rate of the content of the retained γ phases, a step of measuring residual stress applied to the gear, a residual stress ratio calculation step of calculating a residual stress ratio to residual stress in an initial state of the gear, and a reusability determination step of determining whether or not the gear is reusable on the basis of results of the calculation in the retained γ phase change rate calculation step and the residual stress ratio calculation step. In the reusability determination step, it is determined that the gear is reusable where the state of the gear corresponds to a first phase Por a second phase Pfrom among the first phase P, the second phase P, and a third phase P, and it is determined that the gear is not reusable where the state of the gear corresponds to the third phase P.

Reusability determination method for gear and reusability determination system for gear

[Object] To provide a thermoelectric generation cell using a safe and inexpensive general-purpose thermoelectric material. [Solving Means] A thermoelectric generation cell, including: a fire-resistant-material frame () that holds a plurality of stacked thermoelectric generation units in a state of being insulated from adjacent thermoelectric generation units with each other; a heating section () of a plurality of stacked bodies of the thermoelectric generation units, the heating section being provided to the fire-resistant-material frame; and first and second cooling insulation oil sections (and) that are provided at both sides of the fire-resistant-material frame, the first and second cooling insulation oil portions (and) being provided on sides of first and second cooling sections of the thermoelectric generation units, the thermoelectric generation cell having a structure in which the thermoelectric generation units are bridged while being extended between the first cooling insulation oil section, the fire-resistant-material frame, and the second cooling insulation oil section.

Thermoelectric generation cell and thermoelectric generation module

Growing community of inventors

Tsukuba, Japan

Susumu Meguro