Rotary cylinder device

Abstract

A plurality of guide shafts which are disposed parallel to an input/output shaft (a first input/output shaft, a second input/output shaft) are assembled in a case body which holds a cylinder in which first and second piston sets, move reciprocally. A first guide bearing, which abuts both side surfaces of a first piston body and receives only lateral pressure generated by the reciprocal movement, and a second guide bearing, which abuts both side surfaces of a second piston body and receives only lateral pressure generated by the reciprocal movement, are assembled coaxially and separated in an axial direction on each guide shaft.

1 . A rotary cylinder device converting rotation of an input/output shaft, which is rotatably supported by a case body, into reciprocal movement of a plurality of piston sets, which are perpendicularly arranged with respect to an eccentric cam, according to the principle of hypocycloid,
 wherein a plurality of guide shafts, which are disposed parallel to the input/output shaft, are assembled in the case body, which accommodates a piston unit having first and second piston sets assembled to the eccentric cam and positioned in an axial direction, and   wherein a first guide bearing, which abuts both side surfaces of a first piston body and receives only lateral pressure generated by the reciprocal movement, and a second guide bearing, which abuts both side surfaces of a second piston body and receives only lateral pressure generated by the reciprocal movement, are assembled coaxially and separated in the axial direction on each of the guide shafts.   
     
     
         2 . The rotary cylinder device according to  claim 1 , wherein each of the guide shafts has a projected part, which is radially outwardly projected, a shaft part thereof including the projected part is fitted into a shaft hole formed in the case body, and rotation of the shaft part is prohibited. 
     
     
         3 . The rotary cylinder device according to  claim 1 , wherein both shaft ends of each of the guide shafts are held by corner parts where the first piston body and the second piston body are intersected in the case body, and each of the guide shafts is assembled to a position at which the first guide bearing abuts both side surfaces of the first piston body and the second guide bearing abuts both side surfaces of the second piston body. 
     
     
         4 . The rotary cylinder device according to  claim 2 , wherein both shaft ends of each of the guide shafts are held by corner parts where the first piston body and the second piston body are intersected in the case body, and each of the guide shafts is assembled to a position at which the first guide bearing abuts both side surfaces of the first piston body and the second guide bearing abuts both side surfaces of the second piston body.