Rotary expansible chamber devices – Intermittently accelerated and receding members rotate in... – Each a working member
Patent
1995-07-14
1997-10-14
Freay, Charles G.
Rotary expansible chamber devices
Intermittently accelerated and receding members rotate in...
Each a working member
475332, F01C 1702
Patent
active
056765347
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a gearing for use in connection with a rotary machine, and more particularly relates to what may be correctly described as by definition a "dveljagimmal"--being a combination of the Norse origin word "dvelja" (meaning "dwell" or "slight regular pause in motion" without necessarily stopping--"to linger" and the word "gimmal" (meaning anything consisting of parts moving within each other and interlocked).
Rotary machines to which this invention are applicable include rotary steam engines, rotary pumps and, importantly, rotary internal combustions engines, all of the type known as "cat and mouse" machines.
Such rotary machines typically comprise a pair of piston assemblies having at least double wing or vane type pistons radially disposed in a cylinder. The piston assemblies are rotatable about the central axis of the cylinder and fluid or combustion chambers are formed between adjacent cooperating pistons. These pistons are typically connected by way of a control mechanism in a manner whereby, in addition to a common rotary motion, a relative regular oscillatory motion is superimposed thereby causing the chamber created between adjacent cooperating pistons to cyclically enlarge and reduce.
The present invention is particularly directed to control mechanisms and devices for control of the relative oscillatory motion between the pistons of rotary machines, but utilising principles of construction and operation significantly different from those conventionally or previously employed.
BACKGROUND AND PRIOR ART
Rotary machines of the kind referred to generally employ one of two possible operational actions.
The first action involves superimposing on the rotational motion of the first piston a backward and forward cyclical oscillation, relative to the second piston. Examples of rotary machines operating with this action can be found in prior patent specifications numbers GB 987989, GB 1028098, GB 1031626, GB 1034023, and GB 1410498.
The second action involves superimposing a backward and forward cyclical oscillation on the rotational motion of both pistons, phase shifted by 180.degree. with respect to each other so that as the pistons of the first piston assembly rock forward the pistons of the second piston assembly, in relative terms, rock backward to meet them. Prior patent specifications numbers WO 86/01255, GB 1419043 and GB 2251655 describe rotary machines which operate on this action.
Rotary machines are generally of much simpler construction than their reciprocating counterparts, requiring no valves, connecting rods and the like. However, a problem does arise in how to control the relative motion of the pistons to achieve the desired effect.
In this regard, the desired action can be, and has previously been, produced with control mechanisms designed to employ a simple harmonic oscillation derived from the motion of a point rotating about an axis. The principle difficulty in achieving control of the piston relative motion is in turning what is essentially a two dimensional motion, namely, rotation, into a simple backward and forward oscillation.
Many prior art control systems utilise a sliding pin and slot arrangement to produce the simple harmonic oscillation from rotation of the pin on a pinion gear running off a gear mounted on the main shaft of the rotary machine, or some similar arrangement. Patent specifications GB 1034042 and U.S. Pat. No. 4,788,952 provide examples. Other prior art control systems involve complex systems of cranks, connecting rods and/or cams to derive the oscillation. GB 987989, GB 1028098, GB 1031626, GB 1410478 and WO 86/01255 disclose devices in this regard. All of the above noted prior art devices are deficient in at least one or other of the following ways--they include oscillating masses at relatively large distances from the rotational axis creating complex vibration patterns resulting in mechanical inefficiencies, they are unable to cope with high speed operation and/or rapid changes in operating speed, they are subject to high m
REFERENCES:
patent: 4788952 (1988-12-01), Schonholzer
patent: 4879924 (1989-11-01), Holthoff et al.
patent: 4957474 (1990-09-01), Kemper
patent: 5203858 (1993-04-01), Seymour-Chalk
Abstract of New Zealand Patent Specification No. 232098 (Donald Clive Hiscock) of Jan. 12, 1990, published in New Zealand Patent Office Journal, No. 1364, vol. 81, Issue No. 12, p. 1828, Issued on Jan. 27, 1993.
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