Expansible chamber devices – Spaced cylinder and piston walls define passage between...
Patent
1986-11-06
1989-01-24
Garrett, Robert E.
Expansible chamber devices
Spaced cylinder and piston walls define passage between...
92175, 92DIG2, 60517, 417418, 384 12, F16C 3100, F16C 3206
Patent
active
047994215
ABSTRACT:
A free-piston Stirling machine has a piston which can reciprocate and also rotate within a cylinder and which is supported and centered in the cylinder by a grooved dynamic bearing, the piston having two end faces which are acted upon during operation by different fluid pressures. The piston includes at least one sealing part having a circular-cylindrical smooth sealing surfaces and at least one bearing part which is provided in its peripheral surface with a groove pattern. The length of the sealing surface and the size of the gap between the sealing surface and the cylinder wall are selected such that the pressure difference across the bearing surface is reduced so that the piston remains free of radial dynamic instability during operation.
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Jones, G. J. et al., "Turbulent Journal Bearings: Dimensionless, Steady-State Performance Charts for the Two-Axial Groove Case", ASLE Transactions, vol. 22, No. 2, 163-174, (1978).
Reason, B. R. et al., "Rapid Design and Performance Evaluation of Steady-State Journal Bearings-A Technique Amenable to Programmable Hand Calculators", ASLE Transactions, vol. 25, No. 3, 429-444, (1981).
Ronald J. Vincent et al., "Test Results of High Efficiency Stirling Machine Components", 17th IECEC, 1982, Los Angeles, Calif., pp. 1867-18 74.
Hsing, F. C., "Formation of a Generalized Narrow Groove Theory for Spiral Grooved Viscous Pumps", Journal of Lubrication Tech., ASME, Jan. 1972, pp. 81-85.
Bremer Fridtjof
Muijderman Everhardus
Garrett Robert E.
Kapsalas George
U.S. Philips Corporation
Wieghaus Brian J.
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