US3799709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radial seal for rotary engine pistons
Assignee: Schmidt K dt GmbH
•
Filing: 1972-06-08
•
Granted: 1974-03-26
•
Expires: 1992-06-08
Abstract
Abstract A radial seal for rotary-piston, internal-combustion engines is disclosed. The piston is polygonal and concentrically mounted on an eccentric shaft for rotation with a sliding fit about an internal axis of rotation. The radial seal includes a sealing strip at each corner of the piston in piston grooves which are parallel to the piston axis. Sealing strip carriers at each corner of the piston extend radially and parallel to the piston axis are made of a material other than that of the piston. The carriers include tubes closed at both ends through which a cooling fluid is circulated. At the radially outer side of the tubes an extension forms the piston grooves. The tubes communicate with an annular chamber located at each face of the piston hub. The annular chambers are divided into a plurality of compartments in communication with each other. The compartments of one annular chamber are connected to the corresponding compartments in the other annular chamber by by-pass conduits.
Inventors
- 👤 J Reitz
- 👤 H Frese
- 👤 R Bedenbender
- 👤 J Heim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:08
CPC Classifications
F; F01; F01C; F01C19/00; F01C19/02; F01C19/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A rotary engine piston having a plurality of corners comprising: a. sealing strip means inserted at each corner of the piston in piston grooves parallel to the piston axis, b. sealing strip carrier means made of a material other than that of the piston positioned at each corner of the piston, said carrier means comprising, i. tube means closed at both ends and ii. extension means forming the piston groove, c. two annular chamber means in said piston, said tube means being in communication with said chamber means for circulating a cooling fluid therethrough, said annular chamber means being divided into, i. a plurality of compartment means which are in communication with each other within each chamber means, ii. the compartment means of one of said chamber means being in communication with the corresponding compartment means of the other of said chamber means except for those compartment means adjacent the corners of said piston.
Claim 2
Dependent Claim
154 words
A rotary engine piston having a plurality of corners comprising: a. sealing strip means inserted at each corner of the piston in piston grooves parallel to the piston axis, b. sealing strip carrier means made of a material other than that of the piston positioned at each corner of the piston, said carrier means comprising, i. tube means closed at both ends and ii. extension means forming the piston groove, c. two annular chamber means in said piston, said tube means being in communication with said chamber means for circulating a cooling fluid therethrough, said annular chamber means being divided into, i. a plurality of compartment means which are in communication with each other within each chamber means, ii. the compartment means of one of said chamber means being in communication with the corresponding compartment means of the other of said chamber means except for those compartment means adjacent the corners of said piston.
Claim 3
Dependent Claim
16 words
Piston of claim 1, wherein leakage oil from the piston bearing is used as the coolant.
Claim 4
Dependent Claim
219 words
A rotary engine piston having a plurality of corners comprising: a. sealing strip means inserted at each corner of the piston with a small play in a piston groove parallel to the piston axis, sealing insert means at each face of the piston, the ends of the sealing strip means fitting into notches formed in said sealing insert means in register with the piston groove, b. sealing strip carrier means positioned at each corner of the piston and extending radially and parallel to the piston axis, said carrier means being made of a material other than that of the piston and comprising i. tube means closed at both ends and ii. extension means on the radially outer side of the tube means forming the piston groove, c. said tube means communicating through inlet passage means with annular chamber means positioned at one face of the piston, said chamber means being divided into a plurality of compartment means in communication with each other, d. said tube means communicating through outlet passage means with annular chamber means positioned at the other face of the piston, said last-mentioned e. the compartment means of one annular chamber means between the compartment means at the piston corners being connected by by-pass conduit means to the opposite compartment means of the other annular chamber means.
Claim 5
Dependent Claim
219 words
A rotary engine piston having a plurality of corners comprising: a. sealing strip means inserted at each corner of the piston with a small play in a piston groove parallel to the piston axis, sealing insert means at each face of the piston, the ends of the sealing strip means fitting into notches formed in said sealing insert means in register with the piston groove, b. sealing strip carrier means positioned at each corner of the piston and extending radially and parallel to the piston axis, said carrier means being made of a material other than that of the piston and comprising i. tube means closed at both ends and ii. extension means on the radially outer side of the tube means forming the piston groove, c. said tube means communicating through inlet passage means with annular chamber means positioned at one face of the piston, said chamber means being divided into a plurality of compartment means in communication with each other, d. said tube means communicating through outlet passage means with annular chamber means positioned at the other face of the piston, said last-mentioned e. the compartment means of one annular chamber means between the compartment means at the piston corners being connected by by-pass conduit means to the opposite compartment means of the other annular chamber means.
Claim 6
Dependent Claim
24 words
Piston of claim 3, wherein said sealing strip carrier means is made of a copper-silicon alloy with an iron group metal, such as nickel.
Claim 7
Dependent Claim
15 words
Piston of claim 3, wherein the sealing strip carrier means is made of a cast-iron.
Claim 8
Dependent Claim
35 words
Piston of claim 3, wherein the inlet and outlet passage means of the tube means open into the respective annular chamber means at an angle of 45*-90* relative to the radius of the tube means.
Claim 9
Dependent Claim
32 words
Piston of claim 3, wherein the by-pass conduit means are inclined from the first chamber means (12) to the second chamber means (14) at an angle of 0*-30* toward the piston axis.
Claim 10
Dependent Claim
49 words
Piston of claim 3, wherein the first chamber means (12) is positioned at that face of the piston which is opposite the gear of the piston and the second chamber means (14) is positioned at that face of the piston which is adjacent to the gear of the piston.
Claim 11
Dependent Claim
42 words
Piston of claim 8 wherein the end of the first chamber means (12) is defined by cover means in the form of a circular ring and the end of the second chamber means (14) is defined by the gear of the piston.
References Cited (Backward Citations)
US3204614A
Cited
GB941029A
Cited
US3130683A
Cited
US3206108A
Cited
US3263657A
Cited
US3302624A
Cited
US3366317A
Cited
US3444842A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |