Expansible chamber devices – Relatively movable working members – Interconnected with common rotatable shaft
Patent
1997-07-10
1998-08-18
Denion, Thomas E.
Expansible chamber devices
Relatively movable working members
Interconnected with common rotatable shaft
92 57, 92179, 92129, 91499, 417269, F01B 300
Patent
active
057945144
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns: articulation of the pistons with correction of the trajectories, prevalent unloading of the thrust from the pistons and seal system with compensated ring, that is connection devices of the pistons of volumetric machines with curved cylinder liners to their relative rotating supports, to compensate for the deviations in trajectory, due to their rigid assembly, that arise at the intermediate angles of rotation of 45.degree., 135.degree., 225.degree., and 315.degree. during the rotation through one complete revolution, within and in combination with the inclined block of liners to a significant degree with respect to the average at the maximum displacement; articulation of the pistons of volumetric machines with crank mechanism or with curved liners that reduces the thrust of the fluid acting on the piston to a minimum, and, furthermore, an improved sealing system with compensated ring with recovery of wearing and of the manufacturing imperfections of the liner, in volumetric machines in general.
BACKGROUND OF THE INVENTION
Prior art relevant to the present invention comprises the pistons of volumetric machines with curved liners as described in patent application (WO94/10442), where three types of piston are described: piston for endothermic engines or for gaseous fluids with a high angle of inclination, coupled to the extremities of the engine shaft by means of gudgeons arranged radially at the centre of curvature of the trajectories; piston rigidly connected to the relative support plate; pistons with rigid stem and a spherical coupling with oscillating clearance on the screw with semi-spherical head, positioned in axis with the stem of the piston. Said first type show the seal rings that are not positioned in the plane of rotation of the pistons, but in an inclined plane, different for each piston, containing the centre of intersection of axis of rotation of the pistons and of the liner block.
Prior art also comprises articulations of the pistons of volumetric machines, with crank mechanism, of the known type with gudgeons or spherical couplings between the piston and the connecting rod.
Prior art solutions, however, do not permit a satisfactory transmission of the thrust generated by the fluid on the connecting rod or support element and, in the case of machines with curved liners, a satisfactory simultaneous compensation of the errors in the paths of the trajectories at the intermediate angles of rotation, 45.degree., 135.degree., 225.degree., and 315.degree.: the correction has to occur in a direction which is tangential to the trajectory of the piston, that is, perpendicular to the radial direction.
At the same time as the said correction it is also necessary to compensate the centrifugal load acting on the piston that is free to oscillate, in order to prevent it from sliding against the internal surface of the curved liner: this causes both a rapid deterioration of the seal rings and an ovalisation of the liner. The combined effect of the error in the trajectory and of the centrifugal load is not compensated by any of the prior art pistons; at least one oscillating element is present in all of these: the piston on the gudgeon, the seal ring on the piston or the head of the piston on the stem that does not completely counteract the said combined effect. Volumetric machines with curved liners obtained with the said solutions have a high degree of wearing of the curved liner, short lifetime of the fluid seal and excessive noise levels due to the clearance required for the oscillation.
Prior art also comprises various types of seals in all kinds of materials, split rings, with clearance recovery with separate internal elastic elements or due to their elastic properties, though always requiring the arrangement of a plurality of rings, each in its own seat, in the sealing surface and/or with a limited capacity for recovering wearing and/or manufacturing clearances in the liner-piston coupling.
Prior art, therefore, has considerable limitations as r
REFERENCES:
patent: 2329480 (1943-09-01), Neuland
patent: 2691348 (1954-10-01), Gunther
patent: 3281065 (1966-10-01), Chaffiotte
patent: 3762276 (1973-10-01), Gates
patent: 3945348 (1976-03-01), Balve
patent: 4138930 (1979-02-01), Searle
patent: 5249506 (1993-10-01), Willimczik
patent: 5636561 (1997-06-01), Pecorari
Denion Thomas E.
S.A.I. Societa' Apparecchiature Idrauliche S.p.A.
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