CN100410569C - Oil ring - Google Patents
Oil ring Download PDFInfo
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- CN100410569C CN100410569C CNB2003801023157A CN200380102315A CN100410569C CN 100410569 C CN100410569 C CN 100410569C CN B2003801023157 A CNB2003801023157 A CN B2003801023157A CN 200380102315 A CN200380102315 A CN 200380102315A CN 100410569 C CN100410569 C CN 100410569C
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- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
It is a main object of the present invention to provide an oil ring which is capable of reducing sliding friction even in a high speed revolution region of a piston, and capable of reducing the consumption of oil. To achieve the object, the present invention provides an oil ring which is formed into cross-section substantially of an I-shape that two rails are connected at a columnar portion thereof, wherein a sliding projection formed in each of the two rails comprises an outer side surface of sliding projection which forms an outer portion of the sliding projection, a inner side surface of sliding projection which forms an inner portion of the sliding projection, and a sliding surface which slides on a cylinder inner wall and forms a tip end of the sliding projection; wherein a taper angle of the outer side surface of sliding projection is in a range of 10 DEG to 60 DEG ; and wherein the outer edge portion, where the outer side surface of sliding projection and the sliding surface are joined to each other, is formed into the curved surface, and the sliding surface has the curved surface sliding portion which is joined to the outer side surface of sliding projection and formed into a gently curved surface.
Description
Technical field
The present invention relates to a kind of oil ring for internal combustion engine that can reduce sliding friction and can reduce lubrication oil consumption.
Background technique
In the past, on internal-combustion engine,, importantly reduced the friction in the piston in order to improve fuel efficiency.Particularly the piston ring of internal-combustion engine in order to reduce frictional force, requires to improve the quality of pressure ring and oil ring.In addition, also require to reduce the consumption that frictional force reduces lubricant oil simultaneously.
For example, oil ring has the function that scrapes lubricant oil, bears the lubricant oil regulatory function of control lubricating oil consumption again, in order to improve these functions of oil ring, has developed the technology of attenuate oil ring axial width.
Traditional oil ring example that is thinned, as shown in Figure 4, the cross section that oil ring 1 has been linked two ring rails 2,3 by web 4 slightly is the part of I font.In this example, show two ring rails 2,3 and be formed symmetrical example.Such oil ring 1 has: its front end is established the slide part projection inner side surface 8 with slide part projection 5, the slide part projection outer side surface 7 that forms these slide part projection 5 external lateral portion and formation inside part of sliding with cylinder barrel 20 inwalls 21 slip surfaces 6.In addition, link two ring rails 2,3 and the circumferential groove 9 that forms is to hold the groove of the oil that is scraped from inner wall of cylinder 21 by slip surface 6 by web 4, and, be contained in the interior oil of circumferential groove 9, by being located at a plurality of oilholes 16 on the web 4, to interior all side shiftings of oil ring 1.
On the oil ring of this spline structure,, by the axial width of attenuate oil ring, be h height shown in Figure 4, can improve the lubricant oil regulatory function of oil ring from reducing the viewpoint of lubricating oil consumption.Because the h size is more little to reduce friction more, thus help reducing the consumption of lubricant oil, but the slip surface of two sections oil rings is different with 3 sections oil rings, owing to it is and the smooth structure that contacts in cylinder hole usually, so the abutment surfaces that can form at the long term maintenance initial stage.
Owing on smooth face, do not apply the effect of wedge,, and can strengthen frictional force when on smooth wide, having cut off oil film so the oil slick thickness of slip surface is thin.Even be called oil ring, because the Zone Full at operation process is to turn round with fluid lubrication, when oil film is thin, strengthened the velocity gradient of oil film, because the big more then shear strength of velocity gradient is big more, so, produce the zone of high shear strength by wide burnishing surface, can strengthen the friction of crossing over whole.
For fear of the generation of this situation, the most important thing is to reduce the width of slip surface contact.
In addition, on real public clear 46-12405 communique, disclose at the piston ring axial width and had on the thick piston ring that encircles rail up and down, it is not in good time to produce shaking the head of swinging etc. at the piston that moves up and down along with piston, in order to prevent to have developed the technology that the slip surface shape of piston ring is formed cydariform because of partly apply piston ring scorification that excessive pressure produces etc. at the piston ring seamed edge that contacts with inner wall of cylinder.
In addition, as the low oil ring of lubrication oil consumption, open on the rail of ring up and down that discloses on the 2002-71021 communique at oil ring the spy and to be respectively equipped with first conical surface and second conical surface, and, strengthened and last ring rail angle ratio and the following angle of encircling the second continuous conical surface of trackside slip surface, thus, increasing oil slick thickness when ring rises, the attenuate oil slick thickness reduces lubrication oil consumption with this when ring descends.Use this oil ring, have need process the different conical surfaces up and down or when assembling, need judge oil ring towards etc. the problem of miscellaneous operation.
Summary of the invention
The present invention in view of the above problems, and is a kind of in the high rotational speed region of piston, also can help the lubrication oil consumption and the oil ring of processing easily by the oil ring that reduces sliding friction even its purpose is to provide.
For achieving the above object, oil ring of the present invention, be to link the oil ring that two ring rails, cross sections slightly are the I font with post portion, the slide part projection that is formed by above-mentioned two ring rails has: form above-mentioned slide part projection external lateral portion slide part projection outer side surface, forms the slide part projection inner side surface of above-mentioned slide part projection inside part, slide and forms the slip surface of above-mentioned slide part projection fore-end with inner wall of cylinder, its spy just is: the angle of inclination of the protruding outer side surface of above-mentioned slide part is in 10 °～60 ° scope; The outer incline portion that above-mentioned slide part projection outer side surface engages with above-mentioned slip surface is formed the curved surface shape, above-mentioned slip surface, has the curved surface slide part that engages and be formed the gentle slope curve form with above-mentioned slide part projection outer side surface, above-mentioned curved surface slide part engages with above-mentioned slide part projection inner side surface, from above-mentioned curved surface slide part and above-mentioned slide part projection outer side surface engaging portion, to oil ring radially the width of above-mentioned slip surface, be 3 μ m～100 μ m with the protruding inner side surface engaging portion of above-mentioned slide part.
In the present invention, by being convexed to form, slide part is above-mentioned shape, when on oil ring, producing and producing lean to not in good time with respect to inner wall of cylinder, owing to can contact with curved surface in the outer lateral edges portion that contacts with inner wall of cylinder, concentrate on outer lateral edges portion so can suppress excessive pressure, can reduce sliding friction.
In the present invention, be to link the oil ring that two ring rails, cross sections slightly are the I font with post portion, the slide part projection that is formed by above-mentioned two ring rails has: form above-mentioned slide part projection external lateral portion slide part projection outer side surface, forms the slide part projection inner side surface of above-mentioned slide part projection inside part, slide and forms the slip surface of the protruding fore-end of above-mentioned slide part with inner wall of cylinder, its spy just is; At least a portion from the outer lateral edges portion that above-mentioned slide part projection outer side surface engages with above-mentioned slip surface in the above-mentioned slide part projection outer side surface is formed the curved surface shape; Above-mentioned outer lateral edges portion is formed curve form, and above-mentioned slip surface has the curved surface slide part that engages and be formed the gentle slope curve form with above-mentioned slide part projection outer side surface,
Above-mentioned curved surface slide part engages with above-mentioned slide part projection inner side surface, from above-mentioned curved surface slide part and above-mentioned slide part projection outer side surface engaging portion, to oil ring radially the width of above-mentioned slip surface, be 3 μ m～100 μ m with the protruding inner side surface engaging portion of above-mentioned slide part.
In the present invention, owing to similarly on slip surface, be provided with the curved surface slide part with foregoing invention, so can reduce sliding friction.And, on slide part projection outer side surface, be formed curved surface shape part from least a portion of outer lateral edges, therefore, outer lateral edges portion can be formed slicker and more sly curved surface shape.Therefore, when on oil ring, producing and produce lean to not in good time, can suppress excessive pressure and concentrate on outer lateral edges portion, so can obtain to reduce the effect of sliding friction with this with respect to inner wall of cylinder.
In foregoing invention, by above-mentioned curved surface slide part is engaged with above-mentioned slide part projection inner side surface, then owing to pass through slip surface integral body as the curved surface slide part, slip surface can always contact with inner wall of cylinder with curved surface, therefore have good and tracing ability inner wall of cylinder, can reduce sliding friction effectively.
In foregoing invention, oil ring width radially by the part that makes the part that contact from above-mentioned curved surface slide part and above-mentioned slide part projection outer side surface, contact to above-mentioned slip surface and the protruding inner side surface of above-mentioned slide part, be 3 μ m～100 μ m, then without detriment to the function that scrapes lubricant oil and the lubricant oil regulatory function of oil ring, and can reduce sliding friction.
In foregoing invention, the interior lateral edges portion that above-mentioned slide part projection inner side surface contacts with above-mentioned slip surface is formed curve form, and above-mentioned slip surface has the inner curve slide part that engages and be formed the gentle slope curve form with the protruding outer side surface of above-mentioned slide part.
In foregoing invention, the angle of inclination of above-mentioned slide part projection inner side surface is in 0 °～30 ° scope.Be located in the above-mentioned scope by angle of inclination above-mentioned slide part projection inner side surface; can guarantee that in the anastomosis part of slip surface and slide part projection inner side surface slip surface and slide part projection inner side surface constitute the wide-angle in the oil ring; therefore can avoid concentrating of excess pressure; in conjunction with the shape of slip surface, has the effect that reduces sliding friction.
Description of drawings
Fig. 1 is the summary sectional view of expression oil ring one example of the present invention.
Fig. 2 is the explanatory drawing of expression slide part projection of the present invention one example.
Fig. 3 is the explanatory drawing of other examples of expression slide part projection of the present invention.
Fig. 4 is the summary sectional view of traditional oil ring one example of expression.
Fig. 5 is the summary sectional view that is illustrated on traditional oil ring outer lateral edges portion and inner wall of cylinder contact condition when producing.
Fig. 6 is expression other embodiments' of an oil ring of the present invention summary sectional view.
Even Fig. 7 is that expression produces on oil ring of the present invention, the also discontiguous summary sectional view of seamed edge.
Fig. 8 is expression other embodiments' of an oil ring of the present invention summary sectional view.
Fig. 9 is other embodiments' of an expression slide part projection of the present invention explanatory drawing.
Figure 10 is the plotted curve of the mechanical loss at the engine speed oil ring (FMEP) of the expression embodiment of the invention.
Figure 11 is the ring-oil oil consumption proportional curve figure of the expression embodiment of the invention.
Embodiment
Below, describe oil ring of the present invention in detail.Oil ring of the present invention is divided into two embodiments because of the shape of the slide part projection outer side surface that forms slide part projection external lateral portion is different.At first, first embodiment is described.
A. first embodiment
First embodiment, it is the oil ring that slightly is the I font with the cross section of two ring rails of post portion binding, its spy just is: in the formed slide part projection of above-mentioned two ring rails, have: the slide part projection outer side surface that forms the external lateral portion of above-mentioned slide part projection, form the slide part projection inner side surface of above-mentioned slide part projection inside part, slide with inner wall of cylinder and form the slip surface of above-mentioned slide part projection fore-end, the angle of inclination of above-mentioned slide part projection outer side surface is in 10 °～60 ° scope, the outer incline portion that the outer side surface of above-mentioned slide part projection engages with above-mentioned slip surface is formed the curved surface shape, above-mentioned slip surface has the curved surface slide part that engages and be formed the gentle slope curve form with above-mentioned slide part projection outer side surface.
In the present embodiment, by being convexed to form, slide part is above-mentioned shape, when having produced bad situation about leaning to when generation inclination on oil ring and with respect to inner wall of cylinder, owing to can contact with curved surface in the outer lateral edges portion that contacts with inner wall of cylinder, concentrate on outer lateral edges portion so can suppress excessive pressure, can reduce sliding friction.
Below, with reference to accompanying drawing, specifically describe the oil ring of present embodiment with such advantage.
Fig. 1 is the summary sectional view of an example of present embodiment oil ring.Oil ring 1 shown in this example is slightly to be the I font and to be symmetrically formed the oil ring of two ring rails 2,3 by the cross section that column attitude web 4 links two ring rails 2,3.
This oil ring 1 has the slide part projection 5 that front end is formed with the slip surface 6 of the inwall 21 that slides on cylinder barrel 20, and this slide part projection 5 has the slide part projection outer side surface 7 that forms its external lateral portion, the slide part projection inner side surface 8 that forms its inside part.In addition, with web 4 shackle rails 2 and 3 formed circumferential groove 9, be the groove that holds the lubricant oil that is scraped from inner wall of cylinder 21 by slip surface 6, and, be contained in the lubricant oil in the circumferential groove 9, by being arranged at a plurality of oilholes 16 on the web 4, to interior all side shiftings of oil ring 1.
According to present embodiment, because the shape of slide part projection 5 is formed such shape, therefore, when on oil ring 1, producing, can suppress to increase the sliding friction that is produced because of outer lateral edges portion 10 contacts with inner wall of cylinder 21 brute forces.
That is, when oil ring 1 lifts in the groove of piston 22 and when producing the situations such as vibration interference of unstable state, oil ring 1 is moving up and down and produce in the groove of piston 22.Because when producing such inclination on oil ring 1, the outer lateral edges portion 10 that encircles rail 2,3 any sides up and down all is pressed on the inner wall of cylinder 21 consumingly, so produced the problem of increase sliding friction.And such increase sliding friction can cause producing the consumption that increases lubricant oil, the good situation that reduces the lubricant oil regulatory function.
Fig. 7 is the summary sectional view that is illustrated in outer lateral edges portion and inner wall of cylinder contact condition when having produced on the oil ring of present embodiment.As shown in Figure 7, when produce on oil ring 1 in the present embodiment, the outer lateral edges portion 10 that encircles rail up and down contacts with inner wall of cylinder 21 with curved surface, so can avoid excessive pressure to concentrate on outer lateral edges portion 10.Therefore, according to the oil ring of present embodiment, can reduce sliding friction.
In addition, on Fig. 1, represented with the interior all side contacts with said structure oil ring 1 and to oil ring 1 to oil ring 1 radially foreign side apply power and oil ring be pressed in spiral expander 12 on the inner wall of cylinder 21, be the example of two sections oil rings constituting by oil ring 1 and spiral expander 12.
Below, detailed description has oil ring and other expanders of such present embodiment of advantage.
1. oil ring
Generally, oil ring is to be used to scrape the unnecessary lubricant oil of inner wall of cylinder and the consumption of lubricant oil to be controlled at suitable level and the parts that are provided with.The oil ring of present embodiment, thereby link two ring rail cross sections with post portion and slightly be the I font, and had by the slide part projection that two ring rails form: the slide part that forms above-mentioned slide part projection external lateral portion plays outer side surface, has formed the slide part projection inner side surface and the protruding slip surface that slides with inner wall of cylinder of above-mentioned slide part of above-mentioned slide part projection inside part.
About such present embodiment oil ring, the shape of slide part projection is described at first.
At first, forming on the slide part projection outer side surface of slide part projection external lateral portion, its angle of inclination must be in 10 °～60 ° scope, wherein, is preferably in 15 °～45 ° the scope.The protruding outer side surface of said slide part this moment angle of inclination, the outer lateral incline that means the slide part projection is with respect to oil ring angle radially, particularly as shown in Figure 2, be meant the angle [alpha] folded with the straight line A of oil ring radial parallel direction and slide part projection outer side surface 7.
In the present embodiment, in the time of beyond such slide part projection outer side surface angle of inclination being located at above-mentioned scope, because when assembling oil ring in cylinder barrel, the very big possibility that produces gap on the slide part projection is arranged, therefore can on inner wall of cylinder, produce cut, and sealing is worsened, so had better not do like this.
In addition, by this slide part projection outer side surface angle of inclination is located in the above-mentioned scope, can guarantee the angle of outer lateral edges portion, promptly, as shown in Figure 2, slide part projection outer side surface 7 is a wide-angle with the component side angle γ that slip surface 6 forms, even so produce and outer lateral edges portion when pushing to the cylinder barrel wall is powerful at oil ring, also can prevent centralized high voltage power on narrow area, so, can avoid increasing sliding friction.
On the other hand, form the cone angle of the slide part projection inner side surface of slide part projection inside part, be preferably in 0 °～30 ° the scope.The protruding inner side surface of said slide part this moment angle of inclination, the interior lateral incline that means the slide part projection is with respect to oil ring angle radially, particularly as shown in Figure 2, be meant the angle beta folded with the straight line B of oil ring radial parallel direction and slide part projection inner side surface 8.By such slide part projection inner side surface angle of inclination is located in the above-mentioned scope; can guarantee the angle of slip surface and slide part projection inner side surface anastomosis part, promptly, as shown in Figure 2; the angle δ of slide part projection inner side surface 8 and slip surface 6 component parts sides is a wide-angle; so can prevent that pressure concentrates on this part with this anastomosis part contact inner wall of cylinder the time, and can realize reducing sliding friction.In addition, help improving manufacturing efficient owing to processing easily.
In addition, in the present embodiment, be formed the curved surface shape as the outer lateral edges portion of slide part projection outer side surface and slip surface anastomosis part.Past, as shown in Figure 4, the shape side of the being formed shape of outer lateral edges portion 10.If the outer lateral edges portion of this sample prescription shape is set, then when on oil ring, produce, when leaning to inner wall of cylinder, as shown in Figure 5, outer lateral edges portion 10 can partly contact with inner wall of cylinder 21 with seamed edge.Therefore, on the lateral edges 10, concentrated excessive pressure outside, the problem of the sliding friction of increasing considerably has been arranged.But, in the present embodiment and since outer lateral edges portion be shaped as the curved surface shape, so can prevent that the extreme pressure of external lateral edges portion is concentrated, consequently, can reduce sliding friction.And, utilize the effect of above-mentioned slide part projection outer side surface gradient, can further improve and suppress the effect that sliding friction increases.
In addition, the slip surface of present embodiment is to have the slip surface that engages and form the curved curved surface slide part in gentle slope with slide part projection outer side surface.As this curved surface slide part, get final product so long as can engage and form the curved surface shape with slide part projection outer side surface, there is not special qualification.In addition, as the setting of this curved surface slide part,, there is not special qualification as long as be located at least a portion of crossing over slip surface from outer lateral edges portion.For example, as shown in Figure 2, can be with whole slip surface 6 as curved surface slide part 11, also can be as shown in Figure 3, cross over a part from outer lateral edges portion 10 and form curved surface slide parts 11, with remainder as the slip surface 6 that is formed plane planar slide portion 13.
Owing to utilize the curved surface slide part is set on slip surface in this wise, can make the shape of outside seamed edge portion become curved surface, so, add the effect of the gradient on the above-mentioned slide part projection outer side surface, can obtain further to reduce the effect of sliding friction.
On such slip surface, wherein, the curved surface slide part preferably engages with slide part projection inner side surface.That is, as shown in Figure 2, best whole slip surface 6 becomes curved surface slide part 11.Because by like this shape of slip surface being formed the curved surface shape of integral body, slip surface always can contact with inner wall of cylinder with curved surface, so the tracing ability to inner wall of cylinder is good, and can improve lubricant oil scrape drop and lubricant oil regulatory function, also have the effect that reduces sliding friction.
And, in the present embodiment, except above-mentioned curved surface slide part, also the inner curve slide part can be made as slip surface.This inner curve slide part gets final product so long as engage and be formed curved surface with slide part projection inner side surface, does not have particular determination.In addition, as the setting of this inner curve slide part,, there is not special qualification as long as be located at least a portion of crossing over slip surface from as the interior lateral edges portion of slip surface and slide part projection inner side surface anastomosis part.For example, as shown in Figure 9, can by cross over a part of formed curved surface slide part 11 from outer lateral edges portion 10, is connected with this curved surface slide part 11 and as the planar slide portion 13 that is formed plane part, engage and be formed the curved inner curve slide part 14 in gentle slope with above-mentioned planar slide portion 13 and form slip surface 6, or do not establish planar slide portion 13 shown in Figure 9 and form curved surface slide part 11 and inner curve slide part 14 continuously and slip surface 6 is become the curved surface shape etc. of integral body from the interior lateral edges portion 15 of 10 leaps of outer lateral edges portion.Owing to can be in this wise interior lateral edges portion 15 be formed the curved surface shape by inner curve slide part 14 is set, so lean to etc. not in good time, can suppress excessive pressure to converge when on oil ring, producing inclination, generation and inner wall of cylinder, can reduce sliding friction.
In addition, in the present embodiment, as Fig. 3 and shown in Figure 9, when planar slide portion 13 being made as slip surface 6 a part of, the oil ring axial length of this planar slide portion 13 wherein is preferably in the scope of 50 μ m～100 μ m in the scope of 5 μ m～100 μ m.The oil ring axial length of so-called planar slide this moment portion, under situation shown in Figure 3, be meant by straight line C composition plane slide part 13 and curved surface slide part 11 parts, that draw with the oil ring radial parallel, and by the anastomosis part of slip surface 6 and slide part projection inner side surface 8, promptly by the interval a between the interior lateral edges straight line D 15 and that the oil ring radial parallel is drawn of portion.On the other hand, under situation shown in Figure 9, be meant and be provided with inner curve slide part 14, but by the part of composition plane slide part 13 and curved surface slide part 11 and the straight line C that draws with the oil ring radial parallel, with by engage slip surface 6 and slide part the projection inner side surface 8 part, promptly by the interval a between the interior lateral edges straight line D 15 and that the oil ring radial parallel is drawn of portion.
When like this planar slide portion being made as slip surface a part of, when oil ring moves up and down with normal state, contact with inner wall of cylinder with this planar slide portion.Like this, be controlled in the above-mentioned scope, can reduce and cause lubricant oil to scrape the dysfunction of drop and lubricant oil regulatory function etc. by oil ring axial length with planar slide portion.
On such slip surface, from curved surface slide part and slide part projection outer side surface engaging portion to the oil ring radial width of slip surface with the protruding inner side surface of slide part anastomosis part, specifically as shown in Figure 2, curved surface slide part 11 and slide part projection outer side surface 7 engaging portion, promptly, from outer lateral edges portion 10 to slip surface 6 with the oil ring radial width x of slide part projection inner side surface 8 anastomosis parts, in the scope of 3 μ m～100 μ m, wherein also can in the scope of 3 μ m～30 μ m, particularly be preferably in the scope of 10 μ m～20 μ m.Be arranged in the above-mentioned scope by oil ring radial width slip surface, can be without detriment to the function of oil ring, and can obtain to reduce the effect of sliding friction.
On the other hand, the oil ring radial width of the curved surface slide part when having the inner curve slide part, promptly, as shown in Figure 9, by outer lateral edges portion 10 and be parallel to straight line E that oil ring axially draws, and by in the curved surface slide part 11 by oil ring radially the foreign side position part and be parallel to interval b between the straight line F that oil ring axially draws, in the scope of 3 μ m～100 μ m, wherein also can be in the scope of 3 μ m～50 μ m, better in the scope of 3 μ m～30 μ m, be preferably in the scope of 10 μ m～20 μ m.
And, the oil ring radial width of inner curve slide part, promptly, as shown in Figure 9, by interior lateral edges portion 15 and and the straight line G that draws of oil ring radial parallel, and by in inner curve slide part 14 by the part of oil ring radial outside position and be parallel to interval c between the straight line F that oil ring axially draws, in the scope of 3 μ m～100 μ m, wherein better in the scope of 3 μ m～50 μ m, particularly in the scope of 3 μ m～30 μ m for well, preferably in the scope that is 5 μ m～15 μ m.
And when being provided with the inner curve slide part, relation between the oil ring radial width of above-mentioned curved surface slide part and the oil ring radial width of inner curve slide part, be interval b shown in Figure 9 and the relation of c at interval, do not have special qualification, but b cans be compared to that c is the wideest at interval most at interval.In view of the above, can more help reducing sliding friction, and processing easily.
Below, the slip surface width that oil ring is axial is described.The axial slip surface width of so-called oil ring this moment, be meant from outer lateral edges portion to slip surface and the oil ring axial width of the anastomosis part of slide part projection inner side surface, specifically as shown in Figure 2, be by outer lateral edges portion 10 and be parallel to straight line A that oil ring radially draws, and the anastomosis part by slip surface and slide part projection inner side surface and be parallel to width y between the straight line B that oil ring radially draws, and, in the present embodiment, be to add up to the numerical value of two ring rail two side's width up and down.The axial slip surface width of oil ring like this, in the present embodiment, in the scope of 0.05mm～0.3mm, wherein, preferably in the scope of 0.1mm～0.2mm.Lightweight and reduction lubrication oil consumption in order to realize piston ring generally are preferably in attenuate oil ring axial width on the oil ring, need only for such requirement and just can tackle fully in above-mentioned scope.And, along with oil ring width thin typeization, particularly in the high rotational speed region of piston, strengthened and on oil ring, produced the possibility that vibration is disturbed, the danger that increases sliding friction is arranged, but in the present embodiment, can prevent from fully particularly to produce such problem because of oil ring width thin typeization.
In addition, the oil ring axial width of present embodiment, as long as do not hinder oil ring to scrape the function of lubricant oil or the regulatory function of lubricant oil, just there is no particular limitation.
And, this moment, so-called oil ring axial width was meant on the rail of ring up and down that constitutes oil ring, the oil ring width on the oil ring above last ring rail below encircling rail down is axial, concrete as shown in Figure 1, be meant above last ring rail 2 oil ring to encircling rail 3 down below the oil ring width i on axial.In the present embodiment, such oil ring axial width, concrete is in the scope of 1mm～3mm, it is desirable in the scope of 1.2mm～2mm.As mentioned above, the consumption in order to realize alleviating the weight of piston ring and to reduce lubricant oil it would be desirable attenuate oil ring axial width.In addition, present embodiment, be in above-mentioned scope attenuate oil ring, for the special increase sliding friction of tilting to cause because of oil ring mostly that produces when piston runs up, have the effect that can reduce sliding friction.
In addition, the tension force of present embodiment oil ring, as long as can exert pressure well to inner wall of cylinder, there is no particular limitation, but more particularly, oil ring tension force (N) is preferably below the 0.5N/mm divided by value, the oil ring tension force ratio (N/mm) of ring internal diameter (mm), wherein is preferably in below the 0.2N/mm.Oil ring with above-mentioned scope tension force, be commonly referred to as the low-tension oil ring, but on such low-tension oil ring, be difficult on oil ring, produce vibration in the piston low rotation speed area and disturb, but the possibility that produces in high rotational speed region is big, therefore can fully effectively utilize the effect of present embodiment.
Below, as the shape of present embodiment oil ring integral body, be with post portion link two ring rails the shape that slightly is I shaped sections and slide part projection so long as above-mentioned shape then there is no particular limitation.For example, can exemplify out shown in Fig. 6 (A), the inside part of slide part projection 5 is formed step-like shape, or shown in Fig. 6 (B), is slide part projection 5 to be located at axial inboard of oil ring 1 and to form the shape that is commonly referred to as shoulder 30 parts etc. in the axial outside.
In addition, in the present embodiment, the surface treatment protective film as to slip surface and the enforcement of slide protrusion portion is preferably formed as gas nitriding film, plasma nitriding film, ion plating film, diamond-like carbon film or metallic hard carbon film.The gas nitriding film only otherwise covering (masking) then can be formed at whole circumference but can only be formed at excircle in the present embodiment, also can be formed at whole circumference, can suitably select to form part.
In the above-mentioned surface treatment, plasma nitriding film or ion plating film preferably only are formed on the outer peripheral surface.As the instantiation of ion plating film kind, Cr-N series or Cr-B-N series are arranged, and Ti-N series etc.
When forming above-mentioned hard films, if the protruding inner side surface of the slip surface of slip surface and its downside is become sharp-pointed seamed edge, then form otch easily or peel off, so the curved surface shape on gentle slope (R face) preferably.
In the present embodiment, as the material that forms oil ring, can use have proper toughness and, when two sections oil rings, the material that can be out of shape not because of the tension force of expander, concrete is so long as be used for the steel of oil ring in the past, not have special qualification.Wherein, can suitably use material of being equivalent to Martensitic Stain Less Steel (SUS440, SUS410 material), 10Cr, 8Cr, alloy tool steel (SKD material), SKD61, SWOSC-V, SWRH etc.
Other
The oil ring of present embodiment only is applicable to the situation of the one section oil ring that is made of the oil ring with said structure, and then also is applicable to the situation of the oil ring of present embodiment with two sections oil rings of the expanding ring combination that applies elastic force to the oil ring radial outside.
For example, as expanding ring used when two sections oil rings, as long as can become the expansionary force of generation to the oil ring radial outside, there is no particular limitation.For example, can be for the wire coil curl of circle and the outer peripheral surface of spiral expanding ring is carried out ground form expanding ring of ring-type etc. with the cross section.In addition, spiral expanding ring example shown in Figure 1 is that the cross section is circular shape, but its shape not only is confined to above-mentioned shape.This expanding ring also can replace the spiral expanding ring with board-like expanding ring.
B. second embodiment
Second embodiment below is described.Present embodiment is to link two ring rails with post portion, the cross section slightly is the oil ring of I font, the formed slide part projection of above-mentioned two ring rails has: the slide part projection outer side surface that forms above-mentioned slide part projection external lateral portion, form the slide part projection inner side surface of above-mentioned slide part projection inside part, slide with inner wall of cylinder and form the slip surface of above-mentioned slide part projection fore-end, its spy just is: above-mentioned slide part projection outer side surface, be formed the curved surface shape from least a portion of the outer lateral edges portion that above-mentioned slide part projection outer side surface engages with above-mentioned slip surface, above-mentioned outer lateral edges portion is formed the curved surface shape, above-mentioned slip surface has with above-mentioned slide part projection outer side surface and engages and be formed the curved curved surface slide part in gentle slope.
In the present embodiment, the same with first embodiment, by the curved surface slide part is set on slip surface, when on oil ring, producing not in good time that inclination and generation and inner wall of cylinder lean to, owing to can contact with curved surface in the outer lateral edges portion that contacts with inner wall of cylinder, concentrate on outer lateral edges portion so can suppress excessive pressure, can reduce sliding friction.
In addition, in the present embodiment, the part of the outer at least lateral edges of slide part projection outer side surface portion is formed the curved surface shape.Because on such slide part projection outer side surface, at least a portion of outer lateral edges portion is formed the curved surface shape, so can form slicker and more sly curved surface shape with slide part projection outer side surface and curved surface slide part engaging portion, promptly outside in the lateral edges portion.
In the present embodiment, be formed curved part in the slide part projection outer side surface, so long as get final product from least a portion with outer lateral edges portion engaging portion, slide part projection outer side surface, be not particularly limited, as shown in Figure 8, the integral body of slide part projection outer side surface 7 can be formed the curved surface shape, in addition, also can its part be formed the curved surface shape from outer lateral edges portion 10.
Have on the slide part projection outer side surface that is formed curved surface shape part like this, be formed the oil ring radial thickness of curved surface shape part, promptly, as shown in Figure 8, by in the middle of the slide part projection outer side surface 7 that is formed curved surface shape part, be positioned at the part of the most close oil ring radially inner side and to being parallel to the straight line H that oil ring is axially drawn, and, be preferably in the scope of 50 μ m～500 μ m by outer lateral edges portion 10 and to the interval d that is parallel between the straight line I that oil ring axially draws.On the other hand, the slide part projection outer side surface that is formed curved surface shape part oil annulate shaft to width, promptly, as shown in Figure 8, by in the middle of the slide part projection outer side surface 7 that is formed curved part, be positioned at by the oil ring footpath inwardly the side part and be parallel to the straight line j that oil ring is radially drawn, and by outer lateral edges portion 10 and be parallel to interval e between the straight line K that oil ring radially draws, be preferably in the scope of 10 μ m～200 μ m.Be located in the above-mentioned scope by the slide part projection outer side surface shape that will be formed curved surface shape part, can be easily slicker and more sly curved surface shape be processed in outer lateral edges portion.
In addition, the present invention is not limited to the foregoing description.The foregoing description is an example, has the identical structure of the described technological thought essence of the scope of being put down in writing with the present invention and plays the invention of same purpose effect, all is included in the technical scope of the present invention.
[embodiment]
Below narration embodiment further specifies the present invention.
[monomer test]
At first, to oil ring of the present invention, obtain the mechanical loss (FMEP) of the frictional force of utilizing the monomer testing machine.The test method of this moment is that oil ring is contained on the piston, is carrying out after the run-in, changes the revolution that is equivalent to engine speed in the time of oily warm 80 ℃, and measures frictional force.
The oil ring that present embodiment is used, use be the piston ring wire rod that constitutes by Cr:8.0wt%, C:0.72wt%, Si:0.25wt%, Mn:0.28wt%, P:0.02wt%, S:0.01wt%, other inevitable impurities.For this piston ring wire rod, apply hot candied processing and well-known processing method (grinding etc.), then, implementing the gas nitriding processing on the surface and form thickness again is the above diffusion layer of Hv700 of 100 μ m.The adjustment of cylinder amount is to utilize angle and the processing time of adjusting setting tool, and externally the circumference slip surface is justified tumbling processing.
Piston ring specification (please refer to Fig. 2) as follows with the said method manufacturing about y, α, β.
Oil ring d1:81mm, h1:2mm, a1:2mm,
The width y=0.2mm of ring rail
Chamfer angle α: 25 °, chamfer angle beta: 10 °
Opened gap: 0.1mm
The oil ring warp tension ratio is 0.19N/mm
In addition, expander is to make with the wire rod of φ 0.6mm, and the expander diameter is 1.5mm, and spacing is 0.6mm.
In the present embodiment, be four kinds of mensuration of carrying out FMEP of 8 μ m, 15 μ m, 25 μ m to (STD) that does not carry out the tumbling processing, [x] value as shown in Figure 2.Measurement result as shown in figure 10.
According to Figure 10, compare at any rotary area and STD, the FMEP value with barrel surface oil ring is lower, and irrespectively reduces with cylinder heights.Consider and keep little contact width, wish that then the cylinder amount is big.More than show, slip surface is formed drum, can reduce friction.
[real machine test]
Then, to above-mentioned oil ring, at air displacement: 2694cc, cylinder diameter: carry out the affirmation of lubricating oil consumption on 4 cylinder gasoline engines of φ 95mm.
The combination of piston ring at this moment, 1st ring are h1:1.2mm, the a1:2.9mm ring that is made of the 10Cr material to be implemented gas nitriding handle, and it is h1:1.2mm, the a1:3.4mm ring that is made of the FC material that 2nd encircles.What oil ring used is used outer circumferential shape specification (STD and cylinder) in the monomer test, and 1st encircles and 2nd ring gauge lattice are certain, only changes oil ring and tests.Oil ring, use be that [x] value is the drum oil rings in 15～20 mu m ranges.
[test method]
Will with WOT (at full capacity) when engine revolution is 5200rpm, lubricating oil consumption (g/h) numerical value that uses the STD oil ring is as 1, obtains the test result of using the drum oil ring (lubricating oil consumption than) as index.Its result as shown in figure 11.
According to this result as can be known, the lubricating oil consumption ratio, the test result of use drum oil ring has shown low numerical value and has obtained good result.The difference of its numerical value is about 11%.
[utilizability on the industry]
According to the present invention, because the angle of inclination of sliding part projection lateral surface is 10 °～60 ° scope In, and the outer incline section that above-mentioned sliding part projection lateral surface engages with above-mentioned sliding surface is formed song Planar, above-mentioned sliding surface has with above-mentioned sliding part projection lateral surface and engages and be formed the gentle slope curved surface shaped So the curved surface sliding part of shape is when producing at oil ring and leaning to not with respect to the inner wall of cylinder generation In good time, owing to can contact with curved surface in the outer lateral edges section that contacts with inner wall of cylinder, so can suppress excessive Pressure concentration in outer lateral edges section, can reduce sliding friction, and, can play and reduce lubrication oil consumption The effect of amount.
Claims (4)
1. oil ring, be to link the oil ring that two ring rails, cross sections slightly are the I font with post portion, the slide part projection that is formed by above-mentioned two ring rails has: form above-mentioned slide part projection external lateral portion slide part projection outer side surface, forms the slide part projection inner side surface of above-mentioned slide part projection inside part, slide and forms the slip surface of the protruding fore-end of above-mentioned slide part with inner wall of cylinder, it is characterized in that:
The angle of inclination of above-mentioned slide part projection outer side surface in 10 °～60 ° scope,
The outer incline portion that above-mentioned slide part projection outer side surface engages with above-mentioned slip surface is formed the curved surface shape, and above-mentioned slip surface has the curved surface slide part that engages and be formed the gentle slope curve form with the protruding outer side surface of above-mentioned slide part,
Above-mentioned curved surface slide part engages with above-mentioned slide part projection inner side surface,
The oil ring width radially of the part that contacts from above-mentioned curved surface slide part and above-mentioned slide part projection outer side surface engaging portion, to the protruding inner side surface of above-mentioned slip surface and above-mentioned slide part is 3 μ m～100 μ m.
2. oil ring, be to link the oil ring that two ring rails, cross sections slightly are the I font with post portion, the slide part projection that is formed by above-mentioned two ring rails has: form above-mentioned slide part projection external lateral portion slide part projection outer side surface, forms the slide part projection inner side surface of above-mentioned slide part projection inside part, slide and forms the slip surface of the protruding fore-end of above-mentioned slide part with inner wall of cylinder, it is characterized in that:
At least a portion from the outer lateral edges portion that above-mentioned slide part projection outer side surface engages with above-mentioned slip surface in the above-mentioned slide part projection outer side surface is formed the curved surface shape,
Above-mentioned outer lateral edges portion is formed curve form, and above-mentioned slip surface has the curved surface slide part that engages and be formed the gentle slope curve form with above-mentioned slide part projection outer side surface,
Above-mentioned curved surface slide part engages with above-mentioned slide part projection inner side surface,
The oil ring width radially of the part that contacts from above-mentioned curved surface slide part and above-mentioned slide part projection outer side surface engaging portion, to the protruding inner side surface of above-mentioned slip surface and above-mentioned slide part is 3 μ m～100 μ m.
3. oil ring according to claim 1 and 2, it is characterized in that: the interior lateral edges portion that above-mentioned slide part projection inner side surface contacts with above-mentioned slip surface is formed curve form, above-mentioned slip surface has the inner curve slide part that engages and be formed the gentle slope curve form with above-mentioned slide part projection outer side surface.
4. oil ring according to claim 1 and 2 is characterized in that: the angle of inclination of above-mentioned slide part projection inner side surface is in 0 °～30 ° scope.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002315031 | 2002-10-29 | ||
| JP315031/2002 | 2002-10-29 | ||
| JP375603/2002 | 2002-12-25 |
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| CN100410569C true CN100410569C (en) | 2008-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2003801023157A Expired - Fee Related CN100410569C (en) | 2002-10-29 | 2003-10-28 | Oil ring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102575767A (en) * | 2009-09-30 | 2012-07-11 | 日本活塞环株式会社 | Combined oil ring |
| CN107387752A (en) * | 2010-06-04 | 2017-11-24 | 日本活塞环株式会社 | Oil ring for internal combustion engine |
| CN111148893A (en) * | 2017-10-05 | 2020-05-12 | 株式会社理研 | Side rail |
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| AT508782B1 (en) * | 2010-02-15 | 2011-04-15 | Hoerbiger Kompressortech Hold | CIRCUIT ARRANGEMENT AND COMPRESSOR WITH SUCH A CUT-OFF ARRANGEMENT |
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| DE102012004757A1 (en) * | 2011-07-21 | 2013-01-24 | Federal-Mogul Burscheid Gmbh | Oil ring |
| CN102518529A (en) * | 2011-12-28 | 2012-06-27 | 仪征双环活塞环有限公司 | External circle contour shape of oil ring and machining method for external circle contour shape |
| JP5564082B2 (en) * | 2012-08-09 | 2014-07-30 | 株式会社リケン | Tapered face type pressure ring wire and tapered face type pressure ring |
| DE102014003149A1 (en) * | 2014-03-04 | 2015-09-10 | Federal-Mogul Burscheid Gmbh | Oil control piston ring and method of making an oil control piston ring |
| US9784369B2 (en) | 2014-09-12 | 2017-10-10 | Tpr Co., Ltd. | Combination oil ring |
| JP6530200B2 (en) | 2015-02-23 | 2019-06-12 | 株式会社リケン | side rail |
| CN105257826A (en) * | 2015-04-27 | 2016-01-20 | 仪征亚新科双环活塞环有限公司 | Oil scraper ring |
| BR112018008622A2 (en) | 2017-07-05 | 2019-04-02 | Tpr Co., Ltd. | combination oil ring |
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| CN111148893A (en) * | 2017-10-05 | 2020-05-12 | 株式会社理研 | Side rail |
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|---|---|
| CN1708656A (en) | 2005-12-14 |
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