Rotary expansible chamber devices – Interengaging rotating members – Non-parallel axis
Patent
1994-09-08
1996-05-07
Freay, Charles
Rotary expansible chamber devices
Interengaging rotating members
Non-parallel axis
418 20, 418 19, F01C 108, F01C 2116
Patent
active
055139698
DESCRIPTION:
BRIEF SUMMARY
The invention is based on a rotary piston machine, which functions as a pump, compressor or engine, as generically defined hereinafter.
Rotary piston machines of this generic type always have at least one wall portion, which is sealed off from another wall portion and moved, thereby enlarging or shrinking the work chambers. At least one wall portion is moved in a work-producing manner; that is, this moved wall portion outputs power to the operating medium, such as air, gas, oil, etc., or receives power from the operating medium. The other wall parts which serve to define the work chamber that do not actually transmit power, are often called blocking-off parts, even though they may actually have motion of their own or in other words may themselves be a moving wall part. It is accordingly not precluded that the work-producing and the blocking off wall portions can trade tasks. In each case, however, this involves angled-axis rotary piston machines, with a rotary axis position similar to that in cone wheels.
In a know rotary piston machine of this generic type (U.S. Pat. No. 3,856,440), the teeth facing one another are in principle embodied similarly and mesh with one another. The two parts are radially sealingly disposed in a housing with a spherical interior. A ball disposed in the center takes on the task of support for the tumbling motion resulting as the parts rotate relative to one another and also the task of radially sealing off the work chambers from the inside. In this rotary piston machine, functioning as a compressor or pump, the tooth cogs are embodied as convex or concave, or in other words the tooth flanks are slightly curved inward or outward, in order to achieve adequate sealing of the tooth cog from the flank of the tooth opposite it.
Aside from the fact that by using identical tooth structures for the intermeshing teeth, the work chambers cannot be sealed off cleanly and cannot be optimized, and the idle space is unavoidable, the production of this kind of toothing is extraordinarily complicated and expensive.
SUMMARY OF THE INVENTION
The rotary piston machine according to the invention has an advantage over the prior art that by the cooperation of a cycloidally shaped flank face or end face of the cycloid part and the tooth cogs of the other teeth of the control part, a desired positive engagement between the tooth cog and the opposite face is assured. Another advantage is that the axial position (within a conical jacket) of the cycloid part and control part relative to one another can be varied without hindrance to the sealing function.
Another advantage of the invention is that the rotary piston machine can be designed with an idle space ranging toward zero, which is not possible with the generic machine discussed above. Moreover, the ratio between the chamber-defining surfaces and the work chamber volume itself can be determined largely freely, which is likewise not possible in the prior art. Not least, there is a substantial advantage in the fact that the radius of the cog of the teeth on the control part can be largely freely designed.
Although it is known (U.S. Pat. No. 3,492,974) to use a pairing of a cycloidally designed running surface with teeth that have steep flanks in an internal combustion engine, nevertheless a ring, called a control part in the invention, is rotated relative to a housing and tumbles in the process. Thus, a central axis on the tooth ring is also present, which is not embodied with an angled axis to the blocking-off part but rather central-axially or straight-axially. Accordingly, a rotary piston machine of a completely different generic type is involved. Axial readjustability is not possible, nor is optimizing of the idle volume, nor a modification of the tooth cogs, quite aside from the fact that the teeth have a sharp burr on the cog that must accept strong moments without being capable of doing so. This known motor lacks the second rotating part.
In another advantageous feature of the invention, the working positions of the axes of rotation of the exis
REFERENCES:
patent: 1623596 (1927-04-01), Holmes
patent: 2049775 (1936-08-01), Holmes
patent: 3236186 (1966-11-01), Wildhaber
patent: 3464361 (1969-09-01), Voser
patent: 3492974 (1970-02-01), Kreimeyer
Freay Charles
Greigg Edwin E.
Greigg Ronald E.
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