Hitachi, Ltd.

Tokico, Ltd.

Shingo Miyake

Tatsuya Suzuki

Takahisa Hirasawa

Yoshio Senoo

Kazunari Komatsu

Shinji Masubuchi

Yoshie Tsujimi

Toru Okuda

Teruyuki Komori

An oscillating type piston is connected to an output shaft of an electric motor through a crankshaft. The piston is provided with a lip ring that slidingly contacts a cylinder. The motor is rotated forward and reversely by using a control circuit. Thus, different regions of the piston are subjected to a load during forward rotation of the motor and during reverse rotation thereof. Accordingly, wear of the lip ring can be distributed to different regions thereof.

Oscillating type compressor

A lip ring is attached to a piston so as to be rotatable relative to the piston in a circumferential direction, and a seal portion is provided between a ring attachment groove of the piston and an attachment portion of the lip ring. During a suction stroke, the lip ring can be rotated in a circumferential direction of the piston, thus distributing wear around the entire periphery of a lip portion of the lip ring. During a compression stroke, leakage of air from a compression chamber can be prevented by means of the seal portion provided between the ring attachment groove and the lip ring.

Brake-friction material

Growing community of inventors

Yokohama, Japan

Shingo Miyake