| 主权项 |
1. A scroll expander to which steam is supplied as a working medium, comprising:
a driving scroll body that includes a pair of driving end plates and a driving wrap formed on each of the pair of driving end plates, and has a first axis line as a rotary shaft line; a driven scroll body that includes a driven end plate and a driven wrap formed on each of both surfaces of the driven end plate, is disposed between the pair of driving end plates, and has, as a rotary shaft line, a second axis line shifted with respect to the first axis line; a bearing plate that is disposed so as to interpose the driven scroll body, includes a pair of plates coupled to the driven scroll body, and has the second axis line as a rotary shaft line; a cylindrical driving pin that is attached to the driving scroll body, and protrudes from the driving end plate to the bearing plate; and a cylindrical guide ring that is attached to the bearing plate, and includes an inner diameter larger than an outer diameter of the driving pin, wherein a film including diamond-like carbon is formed on an outer circumferential surface of the driving pin in contact with an inner circumferential surface of the guide ring, and the inner circumferential surface of the guide ring includes a polymer resin material with self-lubricity. |
