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In the rotary type cylinder device, a first crank shaft is revolved around a shaft and a composite piston assembly is revolved around the first crank shaft in a state where first rotational mass balance relating to first and second piston units around second virtual crank shafts, second rotational m

In the rotary type cylinder device, a first crank shaft is revolved around a shaft and a composite piston assembly is revolved around the first crank shaft in a state where first rotational mass balance relating to first and second piston units around second virtual crank shafts, second rotational mass balance relating to the composite piston assembly around the first crank shaft and third rotational mass balance relating to the first crank shaft and the composite piston assembly around the shaft are uniformly produced by only first and second balance weights which are attached to end parts of the first crank shaft. Therefore, first and second piston units, which are attached to the second cylindrical sections, are linearly reciprocally moved in radial directions of a circular orbit of second virtual crank shafts, which has radius of 2 r, with relatively revolving around the shaft.

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1. A rotary type cylinder device, which is capable of dealing with interconversion of reciprocating motions of pistons in cylinders and a rotary motion of an input/output shaft (4), comprising: an input/output shaft (4) being rotated;a first crank shaft (5) being eccentrically provided with respect

1. A rotary type cylinder device, which is capable of dealing with interconversion of reciprocating motions of pistons in cylinders and a rotary motion of an input/output shaft (4), comprising: an input/output shaft (4) being rotated;a first crank shaft (5) being eccentrically provided with respect to an axis of the input/output shaft (4), the first crank shaft (5) being revolved around the input/output shaft (4) by a first balance weight (9) adapted to function as a first virtual crank arm and having a radius of r from the input/output shaft (4);an eccentric cylindrical body (6) being constituted by a first cylindrical section (6a), to which the first crank shaft (5) is coaxially fitted, and second cylindrical sections (6b), whose axes are second virtual crank shafts (14a, 14b) made eccentric with respect to an axis of the first cylindrical section (6a) and which are integrated with the first cylindrical section (6a) and located, respectively, on each side of the first cylindrical section (6a) in an axial direction;a first piston unit (7) and a second piston unit (8), in each of which seal caps (17a, 17b) and seal cap retainers 18a 18b are integrally attached to piston head sections (7c, 8c) of piston main bodies (7A, 7B), being crisscrossed with each other and relatively-rotatably attached to the second cylindrical sections (6b) of the eccentric cylindrical body (6);a first balance weight (9) and a second balance weight (10) being adapted to produce rotational balances around the input/output shaft (4), the first balance weight (9) and the second balance weight (10) being respectively provided to both end parts of the first crank shaft (5);a main body case (3) rotatably holding the input/output shaft (4) which is integrally formed in a least one of the first balance weight (9) and the second balance weight (10), the main body case (3) accommodating the first crank shaft (5), the first balance weight (9) and the second balance weight (10), which are adapted to revolve around the input/output shaft (4), the eccentric cylindrical body (6), which is relatively revolved around the first crank shaft (5), and the first piston unit (7) and the second piston unit (8), which are attached to the eccentric cylindrical body (6);wherein a composite piston assembly (P) includes the first piston unit (7) and the second piston assembly (8), which are crisscrossed with each other and relatively-rotatably attached to the second cylindrical body (6b), and the eccentric cylindrical body (6), which is relatively rotatable, with a second virtual crank arm having a radius r, around the first crank shaft (5);a first static balance (B1) relating to the first and second piston units (7, 8) around the second virtual crank shafts (14a, 14b), a second static balance (B2) relating to the composite piston assembly (P) around the first crank shaft (5), and a third static balance (B3) relating to the first crank shaft (5) and the composite piston assembly (P) around the input/output shaft (4) are uniformly produced by only the first balance weight (9) and the second balance weight (10), which are attached to the both end parts of the first crank shaft (5),thereby the first crank shaft (5) is revolved around the input/output shaft (4) and the eccentric cylindrical body (6) is relatively revolved around the first crank shaft (5), so that the first and second piston units (7, 8), which are attached to the second cylindrical sections (6b), are linearly reciprocally moved, along a hypocycloid track centered on the input/output shaft (4), in radial directions of a circular orbit of the second virtual crank shafts (14a, 14b), which has radius of 2r, while relatively revolving around the input/output shaft (4). 2. The rotary type cylinder device according to claim 1, wherein first pinholes (5b) are formed in both end parts of the first crank shaft (5), respectively, and axes of the pinholes (5b) are perpendicular to the axis of the first crank shaft (5),axial holes and second pinholes (9b, 10b) are formed in shaft sections of the first and second balance weights (9, 10) respectively,axes of the second pinholes (9b, 10b) of the first and second balance weights (9, 10) are perpendicular to the axes of the first and second balance weights (9, 10), andthe both end parts of the first crank shaft (5) are respectively fitted in the axial holes of the first and second balance weights (9, 10) in a state where the first pinholes (5b) of the first crank shaft (5) correspond to the second pinholes (9b, 10b) of the first and second balance weights (9, 10), so as to integrate the first crank shaft (5) with the first and second balance weights (9, 10) by fitting pins (11a, 11b) into corresponding pairs of the first pin holes (5b) and the second pin holes (9b, 10b), and retaining the pins (11a, 11b) therein. 3. The rotary type cylinder device according to claim 1, wherein each of the second cylindrical sections (6b) has bearing retainer parts (6c, 6d), which are respectively formed in an inner circumferential face and an outer circumferential face,an inner bearing (15a, 15b) is retained by the bearing retainer parts (6c) formed in the inner circumferential face,an outer bearing (16a, 16b) is retained by the bearing retainer parts (6d) formed in the outer circumferential face, andthe first crank shaft (5) is rotatably held by the inner bearings (15a, 15b), the first and second piston units (7, 8) are held by the outer bearings (16a, 16b).