US3943828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary machines
Assignee: Hydromatic GmbH
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Filing: 1974-11-07
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Granted: 1976-03-16
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Expires: 1994-11-07
Abstract
Abstract In a rotary machine a piston member articulated to a rotary drive member reciprocates in a piston-reciprocation chamber in a piston block mounted for rotation obliquely to the drive member. The piston member comprises a first length, whose cross-section decreases with increasing distance in opposite directions from a plane of maximum cross-section corresponding to the chamber cross-section, and an adjacent length, whose cross-section decreases with increasing distance from the first length, engaging in the chamber for torque transmission between the drive member and the block via the piston member.
Inventors
- 👤 Ludwig Wagenseil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:04
CPC Classifications
F; F16; F16J; F16J1/00; F16J1/001; F04; F04B; F04B1/00; F04B1/12; F04B1/122; F04B1/124
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
256 words
A rotary machine comprising: a rotary drive member; a rotary piston block having portions which define an open piston-reciprocation chamber having a central chamber axis along which the chamber extends with the uniform cross-sectional diameter into the block; bearing means mounting the rotary drive member for rotation about a first axis, fixed relative to the bearing means; mounting means mounting the rotary piston block for rotation about a second axis which is oblique to the said first axis and is spaced from the said central chamber axis; and a piston member having an end portion articulated to the said rotary drive member at a location spaced from the said first axis and having a main portion received in the said piston-reciprocation chamber for reciprocation therein, the said main portion comprising: a first piston length of part-spherical shape for sliding exclusively sealingly in the said piston-reciprocation chamber, so as to form an articulatedly movable sealing location, said part-spherical shape having a cross-sectional plane at which it has a maximum cross-sectional diameter corresponding to the said uniform cross-sectional diameter, the said first piston length decreasing in cross-sectional diameter with increasing distance in opposite directions from the said cross-sectional plane, and a second piston length of frusto-conical shape being located to one end of the said first piston length and having a cross-sectional diameter decreasing with increasing distance from the said first piston length, for engaging with the said rotary piston block in the said piston-reciprocation chamber to transmit rotary drive between the said drive member and the block.
Claim 2
Dependent Claim
256 words
A rotary machine comprising: a rotary drive member; a rotary piston block having portions which define an open piston-reciprocation chamber having a central chamber axis along which the chamber extends with the uniform cross-sectional diameter into the block; bearing means mounting the rotary drive member for rotation about a first axis, fixed relative to the bearing means; mounting means mounting the rotary piston block for rotation about a second axis which is oblique to the said first axis and is spaced from the said central chamber axis; and a piston member having an end portion articulated to the said rotary drive member at a location spaced from the said first axis and having a main portion received in the said piston-reciprocation chamber for reciprocation therein, the said main portion comprising: a first piston length of part-spherical shape for sliding exclusively sealingly in the said piston-reciprocation chamber, so as to form an articulatedly movable sealing location, said part-spherical shape having a cross-sectional plane at which it has a maximum cross-sectional diameter corresponding to the said uniform cross-sectional diameter, the said first piston length decreasing in cross-sectional diameter with increasing distance in opposite directions from the said cross-sectional plane, and a second piston length of frusto-conical shape being located to one end of the said first piston length and having a cross-sectional diameter decreasing with increasing distance from the said first piston length, for engaging with the said rotary piston block in the said piston-reciprocation chamber to transmit rotary drive between the said drive member and the block.
Claim 3
Dependent Claim
21 words
A rotary machine as claimed in claim 1, wherein said first and second piston lengths merge with one another without discontinuity.
Claim 4
Dependent Claim
26 words
A rotary machine as claimed in claim 1, wherein the said main portion is formed with a radial constriction between said first and second piston lengths.
Claim 5
Dependent Claim
56 words
A rotary machine as claimed in claim 1, wherein the said main portion is formed with a circumferentially-extending groove between the said first and second piston lengths, and a piston ring is received in the groove, said piston ring having a radially-outer circumferentially-extending surface of part-spherical shape and being accommodated in said groove with radial clearance.
Claim 6
Dependent Claim
81 words
A rotary machine as claimed in claim 1, wherein the said main portion further comprises a third piston length of a frusto-conical shape located to that end of the said first piston length which is remote from the said second piston length, of cross-sectional diameter decreasing with increasing distance from the said first piston length, for engaging with the said rotary piston block in the said piston-reciprocation chamber to transmit rotary drive between the said rotary drive member and the block.
Claim 7
Dependent Claim
22 words
A rotary machine as claimed in claim 5, wherein the said first and third piston lengths merge with one another without discontinuity.
Claim 8
Dependent Claim
27 words
A rotary machine as claimed in claim 5, wherein the said main portion is formed with a radial constriction between the said first and third piston lengths.
References Cited (Backward Citations)
US2967491A
Cited
DE1949611A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |