A PERIOD OF MOTION

Chen Xinbo

(Tongji University)

Iwatsuki Nobuyuki  Hayashi Iwao

Jinbo Katsuhisa  Morikawa Kouichi

(Tokyo Institute of Technology, Tokyo 145-0061, Japan)

Abstract: In previous researches, Grashof Neutral mechanisms are usually considered that when they come its change points, the transmission ratio will become to 0/0 and then the output motion will be uncertain. Based on the continuity of mechanism motion and the L¢Hospital¢s theorem, the transmission ratio at the change points of the mechanisms are analytically derived and through the kinematic analysis, simulation and experiments, it is demonstrated that the rotating mechanisms will smoothly pass through its change poins with certain speed and make the driving crank rotate two turns in a period of motion. Further, when the links have nearly same length, the mechanisms can output intermittent motion with a long pause and self-locking characteristic, they are useful for industry.

Key words: Grashof  Neutral mechanism  Change point  L'Hospital's theorem  Period of motion  Intermittent motion

CLC No: TH113

Received 20011017, received in revised form 20020530