Hitachi, Ltd.

Shin Meiwa Industry Co., Ltd.

Toshio Kushiro

Shigeru Machida

Katsumi Matsubara

Masahiro Yoshioka

Makoto Uenishi

Kazuaki Miyazaki

An oil-free scroll fluid machine having a stationary scroll member, an orbiting scroll member opposing the stationary scroll member, an orbiting bearing boss provided on the orbiting scroll member and receiving an orbiting bearing, and a drive shaft drivingly engaging with the orbiting scroll member through the orbiting bearing and causing an orbiting motion of the orbiting scroll member relative to the stationary scroll member. The orbiting bearing boss projects from the orbiting scroll member into a compression chamber formed between both scroll members beyond a plane which is at 1/2 the height of the wrap on the stationary scroll member. An ample discharge space is formed between the end of the orbiting bearing boss and the end plate of the stationary scroll member.

Oil-free scroll fluid machine with projecting orbiting bearing boss

A scroll type pump has a fixed scroll and an orbiting scroll engaging therewith, wherein a curve of a wrap of either of the scrolls is offset inwardly or outwardly relative to a set curve so as to prevent formation of a gap between the wraps due to thermal expansion of the scroll wraps.

Scroll type pump with wrap curve offset for thermal expansion

Growing community of inventors

Kawanishi, Japan

Toshio Kushiro