US3843283A - Inner seal for the piston of a rotary piston machine - Google Patents
Inner seal for the piston of a rotary piston machine Download PDFInfo
- Publication number
- US3843283A US3843283A US00343151A US34315173A US3843283A US 3843283 A US3843283 A US 3843283A US 00343151 A US00343151 A US 00343151A US 34315173 A US34315173 A US 34315173A US 3843283 A US3843283 A US 3843283A
- Authority
- US
- United States
- Prior art keywords
- ring
- scraper
- piston
- inner seal
- rings
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
- F01C19/00—Sealing arrangements in rotary-piston machines or engines
- F01C19/10—Sealings for working fluids between radially and axially movable parts
Definitions
- This invention relates to an annular seal for the face of the piston of a rotary piston machine of the trochoidal [30]
- Foreign Application Priority Data type of which the housing comprises two end portions Mar. 24, 1972 Germany 7211239 and a peripheral wall portion with a multi-lobed inner surface, in which the piston is mounted to rotate on an [52] US. Cl. .Q 418/142 e oentric, the seal having at least two scraper rings [51] Int. Cl. F01c 19/12 which are urged resiliently against the adjacent end [58] Field of Search 418/142 wall of the housing to prevent the passage of coolant or lubricant into the working chambers.
- Such seals are [56] References Cited known as inner seals.
- the object of the invention is to provide an inner seal which achieves effective engagement of both scraper rings against the adjacent end wall of the housing and in which the elastic O-ring, if indeed required at all, is arranged so that it is subjected to the heat of the piston only to a slight degree.
- the scraper rings are arranged between the axial limb and the radial limb of a backing ring of L-shaped cross section, the radially inner scraper ring being located in a radial direction by the inner peripheral surface of the radial limb of the backing ring and the radially outer scraper ring being located on the inner scraper ring, and there being a gap between the outer scraper ring and the backing ring, and a resiliently yielding sealing ring being arranged between the two scraper rings and the radially inner scraper ring being non-detachably and tightly connected to the backing ring by an annular disphragm.
- Such an inner seal can be produced as a complete unit ready for installation and is pressed into a circular opening in the end wall of the piston.
- the gap between the outer scraper ring and the axial limb of the backing ring prevents the possibility of this scraper ring jamming.
- the provision of the yielding sealing ring be tween the two scraper rings ensures a relatively long path for the flow of heat from the hot piston to this sealing ring, thereby reducing the thermal loading to which the latter is subjected, so that even if it is an O-ring of elastomeric material it has an adequate working life.
- the diaphragm which connects the inner scraper ring to the backing ring prevents the passage of the working medium through the gap between the inner scraper ring and the backing ring into the interior of the piston and despite this allows practically frictionless movement of the scraper rings.
- This diaphragm can be constructed so that it exerts an axial spring force on the inner scraper ring so that no separate engaging spring is needed for this scraper ring.
- FIG. 1 is a sectional view of the invention take through an inner seal and the adjacent components of the piston and its housing;
- FIG. 2 is an end elevation view thereof
- FIG. 3 is a sectional view of a modification of the invention taken through an inner seal and the adjacent components of the piston and its housing.
- an end wall of a piston is indicated at l, and its face 2 defines, together with the end wall 3 of the adjacent end portion 4 of a housing, a gap 5.
- an annular so-called inner seal indicated 0 generally at 7 is pressed into the circular opening 6 in the end wall I of the piston.
- This inner seal comprises a backing ring 8 of L-shaped cross-section, having an axial limb 9 and a radial limb 10 extending radially inwards from the axial limb.
- the backing ring 8 receives two scraper rings 11 and 12, arranged concentrically one within the other, urged by wavy springs 13 and 14 against the end wall 3 of the housing.
- the wavy springs abut against the radial limb 10 of the backing ring 8.
- the radially inner scraper ring 11 is provided with an axial extension 15 by which it is centered, i.e., located in a radial direction, on the inner peripheral surface 16 of the limb 10 of the backing ring 8.
- the outer scraper ring 12 is located on the inner scraper ring 11, and be tween the limb 9 and the outer scraper ring 12 there is a gap 22 which prevents jamming of the outer scraper ring 11 when the backing ring 8 is pressed into the opening 6.
- an O-ring 18 of elastomeric material which seals the gap between the two scraper rings and prevents the passage of coolant or lubricant from the space 19 radially inside the inner seal 7 via the space 20 between the scraper rings 11 and 12 and the backing ring 8 into the gap 5 between the face 2 of the piston and the end wall 3 of the housing.
- the working medium can penetrate through the gap 5 and the annular gap 22 between the axial limb 9 of the backing ring 8 and the outer scraper ring 12 into the space 20 and assist the engagement of the scraper rings 11 and 12.
- the inner scraper ring 11 is tightly and permanently connected to the backing ring 8 by an elastic annular diaphragm 21.
- the diaphragm 21, which has a U-shaped cross section, is connected by its limbs to the backing ring 8 and to the scraper ring 11, for example by a press fit, by adhesive or by soldering or brazing.
- the inner scraper ring 11 is centered on the backing ring 8 by abutment of its leg 15 on the surface 16 of the backing ring 8. Naturally this abutment is never gas tight nor oil tight because the scraper ring must move axially relative to the backing ring 8. Therefore, the resilient annular diaphragm 21 is provided which bridges gap 17. i
- the seal of the present invention is designed for use with a conventional type rotary piston engine.
- the general components of the engine would include piston 30, mounted on the eccentric 31 of an eccentric shaft 32.
- a housing 33 surrounds piston 30 and has a multi-lobed inner surface 34 so as to provide the necessary working chambers for operation of the engine.
- the annular diaphragm 21 can be made so stiff that it exerts an axial force on the inner scraper ring 11 and urges that ring against the end wall of the housing, so that the wavy sping 13 can be omitted.
- an appropriately shaped single spring can be provided for causing engagement of both scraper rings 11 and 12.
- An inner annular seal for the piston of a rotary piston machine of the trochoidal type of which the housing comprises two end wall portions and a peripheral wall portion with a multi-lobed inner surface, in which the piston is arranged to rotate on an eccentric, the inner seal comprising at least two scraper rings, means for resiliently urging the rings against the adjacent end wall of the housing, a backing ring of L-shaped cross section and having a radial limb with an inner peripheral surface and an axial limb, the scraper rings being arranged between the axial limb and the radial limb of the backing ring of L-shaped cross section, the inner scraper ring being located by the inner peripheral surface of the radial limb of the backing ring and the outer scraper ring being located on the inner scraper ring.
- annular diaphragm is formed so that it serves as an engaging spring for the inner scraper ring to urge it in use against the adjacent end wall of the housing.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Devices (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE7211239 | 1972-03-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3843283A true US3843283A (en) | 1974-10-22 |
Family
ID=6629194
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00343151A Expired - Lifetime US3843283A (en) | 1972-03-24 | 1973-03-20 | Inner seal for the piston of a rotary piston machine |
Country Status (4)
Country | Link |
---|---|
US (1) | US3843283A (US07122547-20061017-C00032.png) |
JP (1) | JPS4947707A (US07122547-20061017-C00032.png) |
FR (1) | FR2178613A5 (US07122547-20061017-C00032.png) |
GB (1) | GB1373193A (US07122547-20061017-C00032.png) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3884602A (en) * | 1974-01-11 | 1975-05-20 | Gen Motors Corp | Rotary engine oil seal assembly |
US4005953A (en) * | 1974-10-18 | 1977-02-01 | Audi Nsu Auto Union Aktiengesellschaft | Piston of a rotary piston engine of trochoid type, having an internal seal |
-
1973
- 1973-03-20 GB GB1325673A patent/GB1373193A/en not_active Expired
- 1973-03-20 US US00343151A patent/US3843283A/en not_active Expired - Lifetime
- 1973-03-21 FR FR7310117A patent/FR2178613A5/fr not_active Expired
- 1973-03-23 JP JP48032799A patent/JPS4947707A/ja active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3884602A (en) * | 1974-01-11 | 1975-05-20 | Gen Motors Corp | Rotary engine oil seal assembly |
US4005953A (en) * | 1974-10-18 | 1977-02-01 | Audi Nsu Auto Union Aktiengesellschaft | Piston of a rotary piston engine of trochoid type, having an internal seal |
Also Published As
Publication number | Publication date |
---|---|
GB1373193A (en) | 1974-11-06 |
JPS4947707A (US07122547-20061017-C00032.png) | 1974-05-09 |
FR2178613A5 (US07122547-20061017-C00032.png) | 1973-11-09 |
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