Importance

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Abstract

A pneumatic motor is provided with twin cylinders each with a piston installed therein slidably, disposed horizontally adjacent in a direction parallel to axis of a motor shaft interposed between the twin cylinders and arranged in a direction intersecting with the twin cylinders at a right angle. An association system couples the motor shaft to each piston and is arranged so as to convert a linear movement of each piston into a rotational movement and transmit the rotational movement to the motor shaft. The twin cylinders, the motor shaft and the association system are disposed integrally in a casing. The association system has each of a first eccentric shaft and a second eccentric shaft, which in turn are disposed projecting from the motor shaft in opposite directions at a phase angle of 90 and coupled with a first eccentric pin and a second eccentric pin in an eccentric state, which in turn are coupled in association with the respective pistons. A pinion gear is disposed in mesh with a ring gear mounted integrally in a motor chamber on an outer periphery of the first eccentric shaft and the second eccentric shaft, respectively.

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First Claim