Patent ID: 6557828
Filing Date: 2003-05-06
Classification: B66D,F01B

Abstract:
A pneumatic motor, comprising:a motor shaft defining a shaft axis; twin cylinders disposed horizontally adjacent in a direction parallel to the shaft axis and with the motor shaft interposed between said twin cylinders such that the shaft axis is aligned a direction intersecting said twin cylinders at a right angle; pistons respectively slidably disposed in said twin cylinders; an association system coupling said motor shaft to said pistons and converting a linear movement of said pistons into a rotational movement and transmitting the rotational movement to said motor shaft; said twin cylinders, said motor shaft and said association system being disposed in a casing; and said association system including: a first eccentric shaft and a second eccentric shaft rotatably mounted in and projecting from opposite ends of said motor shaft, said first and second eccentric shafts being eccentrically disposed relative to said shaft axis, and said first and second eccentric shafts being angularly displaced from each other by a phase angle of 90Â°; said first and second eccentric shafts respectively having first and second eccentric pins disposed eccentrically relative to eccentric shaft axes of said first and second eccentric shafts, said first and second eccentric pins being coupled to respective ones of said pistons; first and second ring gears disposed in said casing coaxially with respect to said motor shaft and at opposite ends thereof; said first and second eccentric shafts respectively having first and second pinion gears on outer peripheries thereof, said first and second pinion gears being respectively meshed with said first and second ring gears; said first and second pinion gears having a pitch circle diameter equal to double an amount of eccentricity from said shaft axis of each of said first eccentric shaft and said second eccentric shaft; and axial centers of said first and second eccentric pins being located on peripheries of pitch circles of said first and second pinion gears.