GB2237617A - Composite oil scraper ring - Google Patents
Composite oil scraper ring Download PDFInfo
- Publication number
- GB2237617A GB2237617A GB8924357A GB8924357A GB2237617A GB 2237617 A GB2237617 A GB 2237617A GB 8924357 A GB8924357 A GB 8924357A GB 8924357 A GB8924357 A GB 8924357A GB 2237617 A GB2237617 A GB 2237617A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rings
- oil scraper
- expander
- composite oil
- spring
- 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.)
- Withdrawn
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
-
- 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
- F16J9/069—Spring expander from sheet metal with a "C"-shaped cross section along the entire circumference
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The ring comprises plate-like rings 1 and a tangential expander 2 in the form of a serpentine annular spring 12 having portions 10 which engage the rings 1 so that rings 1 are pressed against cylinder walls 6 and the wall of the groove 3 in the piston. A mathematical requirement is specified for the pitch of the serpentine spring. <IMAGE>
Description
1 COMPOSITE OIL SCRAPER RING :2:3.7 e. -1- -7 This invention relates to
sealing arrangements, and more particularly to a composite oil scraper ring.
The invention can be used with advantage for sealing pistons in cylinders, and for optimising oil films at the walls of cylinders of internal combustion engines, compressors and other piston type machines.
The invention provides a composite oil scraper ring comprising a pair of plate-like rings and a tangential expander interposed between these rings fabricated from a metal band and fashioned as a curved annular serpentine spring the pitch between adjacent loops of the serpentine spring being determined by the relationship t < 4R + 2S, where t is the pitch between the adjacent loops of the serpentine spring; R is the radius of curvature of the loop head; and S is the width of the band in the plane of bending and wherein the spring is further fashioned so as to have, in axial cross-section, radially directed ledges having shoulders at their inner ends, for supporting and engaging the inner peripheries of the respective plate-like rings.
This construction of tangential expanders ensures a 50 to 100% increase in the service life of the composite oil scraper ring and improvement in its performance characteristics.
The invention will now be described in greater detail with reference to a specific embodiment thereof taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a cross sectional view of a composite oil scraper ring according to the invention placed in a piston groove of a piston of an internal combustion engine; Fig. 2 is an axonometric view of an oil scraper ring according to the invention; Fig. 3 shows a metal band of rectangular section in the form of a serpentine spring which is a blank for the tangential expander; Fig. 4 shows the same as illustrated in Fig. 3 with crimped bearing shoulders to receive plate-like rings; Fig. 5 is a section taken along the line VV in Fig. 4; Fig. 6 shows a shaped serpentine spring with hori 1 k zontal ledges; Fig. 7 is a section taken along the line VEL-VII in Fig. 6; Fig. 8 is a top view of the spring shovin in Fig. 6; Fig. 9 is an alterne.tjve embodiment of a composite oil scraper ring according to the invention; Fig. 10 is an axonometric view of a portion of an oil scraper ring according to the second ei-Tibodiment; Fig. 11 shows a shaped serpentine spring -,jith hori zontal ledges; I -j L Fig. 12 is a section taken along the Ll-ne,1 n Fig. 11; and Fic. 13 is a top plan view of the spring shown in Fig. 11.
A composite oil scraper pistor. ring according to the invention comprises plnte-like rings 1 (Fi-. 1) hav ing a tangential ex ander 2 interposed therebetween. The C> p ring is received in a groove 3 of a piston A to be con Dressed to the inside surface of a c,,1-J.il,,ier 5.
The te.nc.-ential expander 2 is a double-'Luncti--n ex pander acting to ensure tight contact of the plate rings 1 through an antigalling copting 6 with end nalls 7 of the groove 3 of the piston 4 and with' the -i-ii-ner sur-P,-.ce of the cylinder 5.
1Vith reference to Fig. 2, the 4(,e.r.Eential expander 2 is fabricated from a metal band of substantially rectangu- lar cross section with rounded edges a--..d in cross section having the form of bracket-shaped portions extending one into another to form. a loop cirected toward the inside of the composite oil scraper ring.
The bracket-shaped portions of the tan;--ential expender 2 form bridges 8 co-n-.iectin:-.- horizontal ledges 9 having at the ends bePring shoulders 10.-;ith a loop 11 ( Fie,. 1).
The horizontal ledges 9 are intended to transmit t.ie tangential expander 2 to the plate rings the force o 10 1 to ensure that the plate rings 1 are tightly pressed to end jalls 7 of the -roove 3.
C -e2s 1J servs to 4- r a i -L s m i t the The bearin sIloul, C> - - -e rinjs 1 force of the tan entiel ex ander, to the plat v.,itA the aim of -,,resEir,.r. the piate rings 1 to the wall W of the cylinder 5.
The looD 11 aims at comuensati-.,- 'or excessive P-xal ---L -L force of the horizontal ledges 9 tr,..-.s.nitted by the tancential expander 2 to the plate rings 1.
The bridges 8, horizontal ledges 9 and loop 11-form. 20 resilient elements of the tan-entinl expender 2.
The sequence of making tIle resiliert elements of the tangential exDander 2 is illustrated in FiGs 3 to 8.
Fi.. 3 shows a porti(,n of n flat serpentine spri-ng 12 serving as a blank for the tan, er.tieL 2.
The serpentine Sp ring 12 has a pitch. t 2R + 4S end a width "bll. The pitch t and,,jidth "b" deter=ine the resilient properties of the tangential expander 2 4 1 in the radial and axial directions.
R is the curvature r,,,-dius of the head of the loop 11, and S is the width of the band in the plc.ne of bending.
1,Iinir,uzing the pitch t of the spring elements of the tan-ential expander ensures their increase in numb- C1 1.3 - 1.7 accompanied by a correspond- er by a factor o-E ing increase in the nu-..i^r)er of bear-ing shoulder-- 10 (Fig. 2).
beerini -..tiouldei. 10 (Fics. 4) 11PS P. height h (Fig. 5) depending on the thil-1kness of the plate ring 1 The sheDed serpentine 13 (Figs 6, 7, 8) has bridges 8, horizontel ledges ---ith bearin-, shoulder 10, ard a loon 11.
All the elei.ien'bs of the el-.z:)ender 2 are m,,ide by bendin---. the metal band of' rectangular s-ection ivLth roun-ed edges.
The loop 11 (Fic, 7) is feshioned so t_hat its out er surface facinG the lonaitudinal axis of the composite oil sc:.-.aper Projects over the bearing shoulders li in e. direction to,..,ard said axis to a lenSth "1"..he loops 11 is intended for The outer surface of t centering the composite oil scraper in the groove 3 of the piston 4 to prevent thc escape 0 the plate rinEs 1 and tant-ential expander 2 from, the groove 3 and ensure C> C- a rnore relic-ble assembly.
The plate rings 1 and tan...ential expander 2 are SPlit at one point each.
At the point where the tan-ential expander is split there is provided a lock means of any known suitable construction.
The lock means is formed by the ends of the hori zontal ledges 9 crimped in such a manner that in the t:tsse..Pbled state the ends of the LLorizont,,1 ledjes 9 are arran,-,-,ed under the opposite horizontal ledges 9.
The bridges 8 of the end portions of the tangential ex herebet,.,xjee-n restricting tile r,- pander 2 are in contact 'U dial disDlacement of its ends.
The composite oil scraper r--n,(, according to the > -L invention operates in the followi--.--,.
TI uui-int ope-ration of the en----e the pistor 4 reci- pro.cates. The composite oil scraper -,oves toeether CI Y;ith the piston 4 to distribute the opt-4ynu,-l oil film at L.he of the cylinder 5 evacu:.t-i--1i--. excess cil to the - the engine a. U " the cylinder crankcase o L 1 on- the wall ol l through drainage spaces (not sho,,,,n) of the taii.ential 0 expander 2 confined by the bridges 8 end through oil drain holes (not shoi,,jn) of the piston 4.
Tile late 1 of the composite oil scraper ring P c> 11 are continuously pressed durinE operation to the wall of the cylinder 5 by the bearing shoulders 10, cand, to -1 the end vialls 7 of the groove 3 of the -,i-tor. 4 thro i - ugh the horizontal led-es Q by the force of the tan.-en- 1; c, tial expander 2.
This force of the tangential expander 2 is.:rovid- ed v,,hen it is compressed in the course of assembly 9 'i together with the plate rings 1 on the cylinder 5.
The composite oil scraper ring includinG the tan- gential expander 2 end plate rings 1 are secured in the C> groove 3 of the piston 4 prior to mounting in the cylinder 5.
In the course of operation of the proposed composite oil scraper rini, tile Plate rings 1 are forced to the viall of the cylinder 3 and to the end %.,jalls 7 of the groove 3 --qade in the piston 4 to continuously oscillate in the radial direction relative to the bearin,-, shoulders 10 contacting therewith and horizontal ledges 9 of the tanEentiel expander 2.
---d by the -21ate rincs 1 These oscillations are executsimultaneously vjith the movement alonj the cylinder 5 which has a certain ov,-,lit.,.; and taper v.,ithin the s:De-late cified tolerances. As a result, the in.s 1 in contact with the cylinder 5 are continuousl- co.,nn-resc-ed mid expanded. In the case when some section of the cjli----der 5 has 20 a smaller geometry, the plate rings 1 are comn.ressed in the zone of reduced geometry transmitting the force through the bearing shoulders 10 and horizontal ledges 9 to the tangential expander 2. This in turn is accompanied by an increase in the 25 axial compression of the ringE 1 to t1ie el-d walls 7 of the groove 3 of the piston 4. Excess force of axial compression of the plate rings 1 to the end walls 7 of the -.roove 3 of the piston 4 C> is taken up by the loop 11. Therewith, branches of the loop tend to curve to result in reduced clearance therebeti,.veen and compensate for the excessi-ve axial compresssion of the plate rings 1 to the end walls 7 of the groove 3 of the piston 4.
,iith an increase JLn the geometry of the cylinder 5 the branches of the loop 11 are straightened to transmit the force of compression to the plate rings 1 thro- ugh the horizontal ledges 9 and bearing shoulders 10 C.5 of the tan ential expander 2.
In this manner the Plate r-inl-s 1 continuously adjoin the wall of the cylinder 5 L...nd end walls 7 of the groove 3 of the uiston 4 dur-'n.g operrtion of the composite oil scraper ring according to the invention.
An alternative modified forri of an oil scraper ring according to the in-, ,,ention with -reference to Fi-S 9 c-nd -an-ential expandlu comprises two plate rings 1 and a 'U C er 14.
The t-,rL,,ential exl-eunder 14 is a double-f unction exDander to be intended for ensurin.. ti,ht contact of the C cl plate rings 1 having an antigalling coating 6 with the :' the piston 4 and the inend walls 7 of the groove 3 o-IL side surface of the cylinder 5.
The tangential expander 14 is fabricated from a t_:
rectangular metal band lhaving rounded edges, and is fa- shioned as a curved serpentine spring having in cross 9 1-1 t section a bracket-like shape.
The tangential expander 14 has vertical walls 15 and horizontal ledges 16. Ends of the horizontal ledges 16 have vertical bearing shoulders 17.
The vertical walls 15 and horizontal ledges 16 forr. resilient elements of the tangential expander 14.
The sequence of operations associated with fabricating the resilient elements of the tangential expander 14 is similar to the sequence of operation--- for making the first preferred embodiment ol the proposed device with reference to Figs 3 to 5.
A shaped serpentine spring l-- (Figs- 11, 12, 13) has horizontal ledges 16,-vith bearing shoulders 17, and W vertical vialls 15 whosse edc,,es define an acute angle the plane of the horizontal ledges.
1 C) All the elements of the tangential expander 14 are made from ei curved - 1e-i',al band of rectangular section with rounded edges.
tial expander 14 has The split portion of the tanGent a lock means similar in construction to the locL means employed in the first embodiment of the device.
The oil scraper ring according to the second embodiment operates in a manner substantially similar to the operation of the first embodiment, except for the mechanism which compensates excess axial force.
Excessive axial force of the tangential expander 14 (according to the second embodiment) is compensated for 1 k by the provision of the vertical walls 15 at an acute angle to the horizontal ledges 10, whereby compression of the spring coils results in that the vertical walls 15 turn -relative to the horizontal ledges 16 to reduce the angle and consequently to reduce the axi al height of the composite oil scraper ring.
In this embodiment the vertical walls of the tangential expander have no bends centerin,, the expander relative to the groove of the piston which limnits the length of its develooment affectini, I the assembly of the composite oil scraper ring in the groove of the piston. How- 1^ ever, at the same time, tiLis con2tructiin of the vertic- -er makes it '.- al walls of tiie tan ential expa3:-.U lossible to use the composite oil scraper in more narrow piston Prooves, whereas the service life of sucL.L rings " 1.3 1.7 thanks to increas- is increased by a factor 04L --s acco-:lpanied by re- ing tAe nun-foer of beari-r-,., s.,ouldduced rigidity between the sprinS c.oils.
In vie,,,j of the aforedescribed, the prese.-at inven- tion ensures a lonb--er service life of oil scraper rings and reduced consumption of oil and fuel during operation t2.
of carburettor- type and diesel internal combustion engines.
Claims (2)
1. A composite oil scraper ring comprising a pair of plate-like rings and a tangential expander interposed between these rings fabricated from a metal band and fashioned as a curved annular serpentine spring the pitch between adjacent loops of the serpentine spring being determined by the relationship t < 4R + 2S, where t is the pitch between the adjacent loops of the serpentine spring; R is the radius of curvature of the loop head; and S is the width of the band in the plane of bending and wherein the spring is further fashioned so as to have, in axial cross-section, radially directed ledges having shoulders at their inner ends, for supporting and engaging the inner peripheries of the respective plate-like rings.
2. A ring as claimed in claim 1 substantially as heretofore described with reference to the accompanying drawings.
Published 1991 atThe Patent Ofrice. State House, 66/71 Utghliolborn. LondonWC I R47P. Further copies maybe obtained from Sales Branch, Unit 6. Nine Mile Point. Owmielinfacb. Cross Keys, Newport. NPI 7HZ. Printed by Multiplex techniques ltd. St Mary Cray, Kent,
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8914674A FR2654172B1 (en) | 1989-11-08 | 1989-11-08 | MULTIPLE SCRAPER PISTON SEGMENT. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8924357D0 GB8924357D0 (en) | 1989-12-20 |
| GB2237617A true GB2237617A (en) | 1991-05-08 |
Family
ID=9387215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8924357A Withdrawn GB2237617A (en) | 1989-11-08 | 1989-10-30 | Composite oil scraper ring |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3936634A1 (en) |
| FR (1) | FR2654172B1 (en) |
| GB (1) | GB2237617A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4310652C2 (en) * | 1993-04-02 | 1995-05-04 | Goetze Ag | Oil scraper piston ring |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB805458A (en) * | 1957-03-25 | 1958-12-03 | Sealed Power Corp | Piston ring spacer and expander |
| GB1425976A (en) * | 1972-08-02 | 1976-02-25 | Nippon Piston Ring Co Ltd | Piston ring spacer expander |
| GB1559358A (en) * | 1977-12-16 | 1980-01-16 | Nii Tekhnol Traktor I Selskokh | Manufacturing tangential expanders for oil control piston rings |
| GB1586946A (en) * | 1977-05-06 | 1981-03-25 | Goetze Ag | Multiple-part oil-scraper ring |
| GB1590935A (en) * | 1978-02-23 | 1981-06-10 | Nii Tekhnol Traktor I Selskokh | Tangential expanders for oil-control piston rings and apparatus for use in making a plurality of said expanders |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1071147A (en) * | 1952-10-20 | 1954-08-25 | Wilkening Mfg Co | Piston rings |
| FR2416082A1 (en) * | 1978-02-06 | 1979-08-31 | Inst T Traktornogo | Oil scraper ring tangential expander ring - has catch formed by teeth cut from U=section profile shoulders |
| FR2525282B1 (en) * | 1982-04-19 | 1985-07-05 | Inst T Traktornogo | COMPLEX OIL SCRAPER SEGMENT |
-
1989
- 1989-10-30 GB GB8924357A patent/GB2237617A/en not_active Withdrawn
- 1989-11-03 DE DE19893936634 patent/DE3936634A1/en not_active Withdrawn
- 1989-11-08 FR FR8914674A patent/FR2654172B1/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB805458A (en) * | 1957-03-25 | 1958-12-03 | Sealed Power Corp | Piston ring spacer and expander |
| GB1425976A (en) * | 1972-08-02 | 1976-02-25 | Nippon Piston Ring Co Ltd | Piston ring spacer expander |
| GB1586946A (en) * | 1977-05-06 | 1981-03-25 | Goetze Ag | Multiple-part oil-scraper ring |
| GB1559358A (en) * | 1977-12-16 | 1980-01-16 | Nii Tekhnol Traktor I Selskokh | Manufacturing tangential expanders for oil control piston rings |
| GB1590935A (en) * | 1978-02-23 | 1981-06-10 | Nii Tekhnol Traktor I Selskokh | Tangential expanders for oil-control piston rings and apparatus for use in making a plurality of said expanders |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2654172A1 (en) | 1991-05-10 |
| DE3936634A1 (en) | 1991-05-08 |
| FR2654172B1 (en) | 1992-02-28 |
| GB8924357D0 (en) | 1989-12-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |