WO2006134309A2 - Sealing device for internal combustion engine piston - Google Patents
Sealing device for internal combustion engine piston Download PDFInfo
- Publication number
- WO2006134309A2 WO2006134309A2 PCT/FR2006/050602 FR2006050602W WO2006134309A2 WO 2006134309 A2 WO2006134309 A2 WO 2006134309A2 FR 2006050602 W FR2006050602 W FR 2006050602W WO 2006134309 A2 WO2006134309 A2 WO 2006134309A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- segment
- sealing device
- groove
- piston
- holding member
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/06—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction using separate springs or elastic elements expanding the rings; Springs therefor ; Expansion by wedging
- F16J9/064—Rings with a flat annular side rail
- F16J9/066—Spring expander from sheet metal
Definitions
- the present invention relates to internal combustion engines and particularly relates to a piston sealing device.
- the invention more particularly relates to a piston comprising at least one segment, said segment being disposed in an annular groove formed at the periphery of the piston, and held against the lower side of the annular groove by a holding member interposed between the upper face of said segment and the upper side of said groove.
- the upper sealing segments have a cut necessary for the opening of the segment during the mounting operation of the latter in the upper groove.
- a passage for the combustion gases is formed at the sectional cut. Crossing this passage, so-called “blow-by” gas flows observed at full load or so-called “blow-back” gas flow rates in the foot-lift phases represent at least 85% of the total flow.
- the upper sealing segment becomes unstable and no longer ensures tightness. This beat phenomenon is usually observed under low load and at high speed. During these flapping phases, the gas flow suddenly increases up to six times the full load flow, which is accompanied by a decrease in power and an increase in the dilution (presence of gasoline in the oil). ). Also under low load and very high speed, the first segment can remain plated on the upper side of the first groove while the piston is in the relaxation phase. Under these conditions the pressure in the chamber does not compensate for the forces resulting from the inertia of the segment. Thus the segment remains plated on the upper flank of the throat. The segments have a very slight bulge on the rubbing surface.
- This crown exposes the pressure of the combustion gases to a sufficient surface to generate a radial resultant force capable of causing the temporary collapse of the segment. There is then a very significant increase in the flow of combustion gas to the casing. This phenomenon is known as of "radial collapse”. The two aforementioned phenomena occur on the same range of speed and load.
- the axial flapping movements of the upper segment reduce the seal with respect to gas flow rates from the combustion chamber to the oil sump as well as the gas flows mixed with the oil of the casing.
- the present invention aims to limit the movements of axial flapping of a sealing segment.
- the subject of the invention is a device for sealing a piston, comprising at least one segment mounted in a groove of the piston, characterized in that it comprises a segment holding member for pressing said segment against one of the sides of the throat.
- the holding member is disposed between the segment and the upper side of the groove.
- the holding member comprises a circumferential portion forming a spring and having a succession of peaks in contact with the segment or the side of the groove.
- the holding member comprises a circumferential portion forming a spring and provided with a succession of vertices in alternating contact with the segment or the side of the groove.
- the circumferential portion forming a spring consists of a succession of trapezoidal shapes, the vertices of which are in alternating contact with the upper flank of the groove and with the upper face of the segment.
- the circumferential spring portion has a stiffness greater than a Kmin value so as to maintain the segment in contact with the lower flank of the groove.
- the circumferential portion forming a spring has a stiffness less than a value Kmax so as to allow free rotation of the segment around the axis of the piston.
- the circumferential spring portion has a section with two raised edges.
- the segment comprises along its inner periphery a rail and the holding member is provided with means for hooking said member to the rail.
- the holding member further comprises lugs.
- the circumferential part is manufactured by cutting, stamping and bending from a spring steel strip.
- the segment is a superior sealing segment.
- the invention also relates to an internal combustion engine piston comprising at least one sealing device according to any one of the preceding claims.
- FIG. 1 is a schematic representation of a portion of an engine including a crankshaft and a piston mounted in a cylinder head and having three grooves segments;
- FIG. 2 is a schematic representation of the upper part of an internal combustion engine piston comprising the sealing device according to the invention.
- FIG. 3 is a detailed schematic representation of the assembled sealing device according to the invention.
- FIG. 4 is a schematic front view of the sealing device of Figure 3.
- FIG. 1 represents a part of an internal combustion engine composed in particular of a crankshaft 9, a connecting rod 8 and a piston 1 placed in a jacket 7 and provided with three grooves 4a, 4b, 4c intended to house each a piston ring.
- the crankshaft 9 When the crankshaft 9 is in rotation, it puts in translation movement via the rod 8 the piston 1 in the jacket 7.
- FIG. 2 shows the piston 1 comprising in its groove 4a an upper sealing segment 2. Between the upper part of the groove 4a and the upper face of the segment 2 is interposed a holding member 3 intended to be plated, by its stiffness axial, the segment 2 against the lower part of the groove 4a.
- said upper sealing segment 2 is provided along its inner periphery with a rail 5.
- said holding member 3 comprises in particular a circumferential portion 3a, forming a spring, consisting of a succession of trapezoidal shapes, whose vertices are in alternating contact with the upper flank of the groove 4a and with the upper face of the segment 2.
- Said holding member 3 also comprises a quantity N of hooks 3b regularly arranged on the side inside the circumferential portion 3a and intended to hook the holding member 3 to the rail 5 of the segment 2. More specifically, the hooks 3b are made of material of the tops of the circumferential portion forming a spring, in contact with the upper face of the segment (2).
- the rail 5, produced by machining represents a prominent catch for the hooks 3b.
- the rail 5 can be hollowed in the segment 2 thus allowing the housing of the hooks 3b.
- the hooks 3b provide a diametral position of the holding member 3 relative to the relatively fixed segment 2. It will be noted that the hooks 3b exert radial forces which guarantee the radial extension of the segment 2.
- the circumferential portion 3a forming a spring has a stiffness intended to suppress the axial beat movements of the segment 2.
- the stiffness is therefore greater than a value Kmin so as to maintain the segment 2 in contact with the lower flank of the groove 4a .
- the stiffness is less than a Kmax value so as to allow the free rotation of the segment 2 about the axis 6 of the piston 1. It is not necessary to generate too much friction between the segment 2 and the lower flank of the groove 4a because there could occur phenomena of micro welding during engine break-in and wear phenomena.
- the terminals Kmin and Kmax delimiting the stiffness are calculated in particular according to the mass of the segment 2, the maximum engine speed and the stroke of the piston 1.
- the circumferential portion 3a forming a spring has at its cutting two raised edges 3d which in contact allow peripheral crushing of said circumferential portion 3a during the mounting phase.
- the holding member 3 further comprises lugs 3c which facilitate the assembly of the assembly consisting of the segment 2 and the holding member 3 in the groove 4a.
- the rail 5 is obtained directly by machining the sealing segment 2.
- the holding member 3 is manufactured by cutting, stamping and bending from a spring steel strip.
- the hooking member 3 is first hooked onto the segment 2 by means of the hooks 3b, and then the assembly constituted by the segment 2 and the hold 3 in the groove 4a.
- the holding member 3 then mounted in the groove 4a plates the segment 2 against the lower face of the groove 4a by virtue of its stiffness. Due to its shape, it adapts to several groove widths and therefore has a self-calibrating character.
- the invention proposes an original sealing device which solves the problems of axial flapping of the piston rings by interposing an inexpensive holding member.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2006800177128A CN101310133B (en) | 2005-06-14 | 2006-06-13 | Sealing device for internal combustion engine piston |
BRPI0612970-6A BRPI0612970A2 (en) | 2005-06-14 | 2006-06-13 | sealing device for an internal combustion engine piston |
EP06778949A EP1910718A2 (en) | 2005-06-14 | 2006-06-13 | Sealing device for internal combustion engine piston |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0506027A FR2887004B1 (en) | 2005-06-14 | 2005-06-14 | SEALING DEVICE FOR INTERNAL COMBUSTION ENGINE PISTON |
FR0506027 | 2005-06-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2006134309A2 true WO2006134309A2 (en) | 2006-12-21 |
WO2006134309A3 WO2006134309A3 (en) | 2007-05-03 |
Family
ID=35695867
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2006/050602 WO2006134309A2 (en) | 2005-06-14 | 2006-06-13 | Sealing device for internal combustion engine piston |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1910718A2 (en) |
CN (1) | CN101310133B (en) |
BR (1) | BRPI0612970A2 (en) |
FR (1) | FR2887004B1 (en) |
WO (1) | WO2006134309A2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2917787A1 (en) * | 2007-06-25 | 2008-12-26 | Peugeot Citroen Automobiles Sa | Cylinder case's piston sealing and pressure regulating device for petrol engine of motor vehicle, has pressure regulation valve partially regulating discharge flow of exhaust gas of cylinder case of block of engine of vehicle |
DE102015116838B3 (en) * | 2015-10-05 | 2017-02-02 | Federal-Mogul Burscheid Gmbh | piston ring |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4145060A (en) * | 1975-12-20 | 1979-03-20 | Goetze Ag | Axially and radially clamping spreader ring for an oil scraping piston ring |
US4798391A (en) * | 1984-11-28 | 1989-01-17 | Toyota Jidosha Kabushiki Kaisha | Three-piece oil-ring with a slot |
US5087055A (en) * | 1989-08-31 | 1992-02-11 | Kabushiki Kaisha Riken | Steel oil ring assembly |
-
2005
- 2005-06-14 FR FR0506027A patent/FR2887004B1/en not_active Expired - Fee Related
-
2006
- 2006-06-13 EP EP06778949A patent/EP1910718A2/en not_active Withdrawn
- 2006-06-13 WO PCT/FR2006/050602 patent/WO2006134309A2/en not_active Application Discontinuation
- 2006-06-13 CN CN2006800177128A patent/CN101310133B/en not_active Expired - Fee Related
- 2006-06-13 BR BRPI0612970-6A patent/BRPI0612970A2/en not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4145060A (en) * | 1975-12-20 | 1979-03-20 | Goetze Ag | Axially and radially clamping spreader ring for an oil scraping piston ring |
US4798391A (en) * | 1984-11-28 | 1989-01-17 | Toyota Jidosha Kabushiki Kaisha | Three-piece oil-ring with a slot |
US5087055A (en) * | 1989-08-31 | 1992-02-11 | Kabushiki Kaisha Riken | Steel oil ring assembly |
Also Published As
Publication number | Publication date |
---|---|
FR2887004B1 (en) | 2007-11-23 |
EP1910718A2 (en) | 2008-04-16 |
FR2887004A1 (en) | 2006-12-15 |
CN101310133B (en) | 2010-12-01 |
CN101310133A (en) | 2008-11-19 |
WO2006134309A3 (en) | 2007-05-03 |
BRPI0612970A2 (en) | 2012-10-09 |
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