WO2005066482A1 - コイルエキスパンダ用線材およびコイルエキスパンダ - Google Patents
コイルエキスパンダ用線材およびコイルエキスパンダ Download PDFInfo
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- WO2005066482A1 WO2005066482A1 PCT/JP2005/000119 JP2005000119W WO2005066482A1 WO 2005066482 A1 WO2005066482 A1 WO 2005066482A1 JP 2005000119 W JP2005000119 W JP 2005000119W WO 2005066482 A1 WO2005066482 A1 WO 2005066482A1
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- WIPO (PCT)
- Prior art keywords
- coil expander
- wire
- coil
- peripheral surface
- expander
- Prior art date
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- 239000000463 material Substances 0.000 title claims abstract description 27
- 230000002093 peripheral effect Effects 0.000 claims abstract description 184
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 31
- 230000002159 abnormal effect Effects 0.000 abstract description 9
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000003825 pressing Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 78
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- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 3
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- 240000004718 Panda Species 0.000 description 2
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- 229910018643 Mn—Si Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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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
- F16J9/061—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 using metallic coiled or blade springs
- F16J9/062—Coiled spring along the entire circumference
Definitions
- the present invention relates to a wire for manufacturing a piston ring used for a piston of an internal combustion engine, and particularly to a wire for manufacturing a combined oil ring.
- the piston ring generally includes a pressure ring and an oil ring.
- a piston ring for example, in the case of a special two-ring (one pressure ring and one oil ring) or in a top ring of a diesel engine, the piston ring is formed of a heat-resistant material, for example, a steel material.
- a coil expander or the like may be used.
- a coil expander is used when a known two-piece oil ring or the like is used.
- an oil ring requires higher tension than other pressure rings in order to satisfy the function of the oil ring, that is, the oil removing function and the oil control function. For this reason, the contact pressure is increased by reducing the contact width and the contact area, thereby improving the sealing performance and the oil release performance.
- simply increasing the tension will increase friction. Therefore, when the tension was lowered for the purpose of reducing the friction, it was not possible to sufficiently obtain functions such as oil sealability and oil control particularly in a high-speed rotation range.
- Patent Document 1 discloses that a coil expander formed by using a Ni-Ti based shape memory alloy is used. In an oil ring, the coil expander force is in a contracted state at a low temperature. A technique is disclosed that is processed to be in a stretched state at a high temperature.
- the force for pressing the oil ring outward in the radial direction can be changed in accordance with the temperature, so that the startability of the engine can be improved. Can be improved, which is effective in reducing friction.
- the in the Ni-Ti binary system the transverse elastic modulus of the shape memory alloy material is about 6000-9000MPa in the case of the low temperature phase (martensite phase), and the high temperature phase (austenite). Phase) is about 20000MPa. This value is only about 1/4 that of a coil expander that also has a steel wire force that is normally used. Must be four times the thickness of the steel wire. On the other hand, in recent oil rings, the thickness tends to be reduced to improve the followability, and the coil expander formed by using the shape memory alloy is difficult to put into practical use due to size restrictions. Was.
- a coil expander having a rectangular cross section has been proposed.
- the cross-sectional shape is rectangular, the cross-sectional shape will be concave on the outer peripheral surface of the coil expander due to stress such as tension and compression generated by bending it into a coil shape. Deformation may occur.
- Patent Document 2 discloses a cross-sectional shape of a wire rod of a coil spring used in a valve gear of an internal combustion engine.
- the cross-sectional shape of the wire rod of the inner valve spring is made asymmetrical, and different characteristics are imparted to each part.
- Such a valve spring and a coil expander have the same panel shape. Since the purpose and function of their use are completely different, the above-mentioned coil spring technology is applied to the coil expander. I can't.
- Patent Document 3 discloses a seal ring having a cross-sectional shape with different curvatures and a curved surface force. This is similar to the coil expander described above, in which the wire is It is intended to cope with a change in the cross-sectional shape that occurs when the semiconductor device is formed.
- the seal ring and the coil expander have completely different uses and functions, have completely different curvatures when forming the coil shape, and have different required characteristics. Are not applicable to coil expanders.
- Patent Document 1 Japanese Utility Model Publication No. 3—41078
- Patent Document 2 Japanese Utility Model Publication No. 63-92011
- Patent Document 3 Japanese Utility Model Publication No. 52-1933
- the present invention has been made in view of the above-mentioned object, and is unlikely to cause abnormal wear and a resultant decrease in strength, and to cause troubles. It is possible to manufacture a coil expander without complicated work. It is a primary object of the present invention to provide a wire rod for a coil expander. Means for solving the problem
- the present invention has been made in view of the above-mentioned object, and has been made in consideration of the above-described object, and provides a coil piston of a combination piston ring having a piston ring and a coil expander for urging the piston ring radially outward.
- a coil expander wire having a rectangular cross section, which is used for an expander.
- the outer circumferential surface of the coil expander is used for forming the coil expander.
- a wire for a coil expander characterized in that the surface of the wire is formed in a convex curved surface.
- the wire for a coil expander of the present invention is processed into the above-described shape in consideration of deformation occurring in a portion to be an outer peripheral surface of the coil expander when being bent into a coil shape. Therefore, by using the coil expander wire of the present invention, it is possible to prevent the cross-sectional shape from becoming concave due to deformation after coiling, and to perform post-processing such as cutting or polishing on the outer peripheral surface. At least, it is possible to manufacture a coil expander in which the coil expander is arranged, for example, the surface of the coil expander slides with respect to the inner circumferential groove of the oil ring.
- the height force of the curved surface on the surface of the coil expander wire rod formed into the convex curved surface is preferably in the range of 0.03-0.1 mm. .
- a coil expander wire rod having a curved surface height in the above range does not become concave due to deformation of the outer peripheral surface of the coil expander after being bent into a coil shape. In other words, a flat shape that allows surface sliding can be obtained.
- the surface of the coil expander wire which is the inner peripheral surface of the coil expander is concave. Is preferably formed in the shape of a curved surface.
- a force acts in the direction of compression on the inner peripheral surface of the coil expander to form a coil expander whose inner peripheral surface is deformed into a convex shape. May be. Since such a coil expander makes one contact with the core material inserted inside, there is a high possibility that abrasion or breakage on the inner peripheral surface occurs.
- the present invention by forming the surface of the coil expander wire rod, which is the inner peripheral surface of the coil expander, into a concave curved surface, the inner peripheral surface of the coil expander when formed as a coil expander is formed. To prevent the inner surface from being deformed in a convex shape, and to reduce wear and breakage of the inner peripheral surface.
- the height of the curved surface on the surface of the coil material for the coil expander formed in the convex curved shape is defined as a
- the coil expander formed in the concave curved shape is defined as a.
- the height of the curved surface on the surface of the wire is b
- the surface of the coil wire for the coil expander formed in the shape of the convex curved surface has an outer peripheral surface located at both ends in the width direction of the wire for the coil expander.
- the radius of curvature of the curved surface is at the center in the width direction of the coil expander wire. It is preferable that the radius of curvature is smaller than the radius of curvature of the curved surface at the center of the outer peripheral surface on the outer peripheral surface side.
- the radius of curvature of the curved surface of the portion is smaller than the radius of curvature of the curved surface at the center of the inner peripheral surface located at the center in the width direction of the coil expander wire.
- the wire material for the coil expander has a flat side force.
- the coil wire for the coil expander can be formed in a coil shape, thereby preventing the wire from being twisted when forming the coil expander.
- the piston ring is an oil ring.
- the wire force for a coil expander is formed of a shape memory alloy.
- the wire for coil expander formed using a shape memory alloy is particularly large in deformation due to tension and compression forces generated when it is bent into a coil shape, so that the effects of the present invention are fully utilized. Because it can be.
- a coil expander characterized by being formed using the above-described wire for a coil expander.
- the coil expander wire is formed in anticipation of deformation when formed as a coil expander, a coil expander manufactured using the coil expander wire is used. This has the effect of reducing costs and simplifying the manufacturing process so that inconveniences such as abnormal wear and reduced strength are not generated.
- the oil ring and the oil ring are pressed radially outward.
- the coil expander is formed of a shape memory alloy, has a rectangular cross section, and has a flat outer peripheral surface.
- the cross-sectional shape is rectangular and the outer peripheral surface is flat, it can be slid on the inner peripheral groove of the oil ring in which the coil expander is arranged.
- the outer peripheral surface of the coil expander is preferably a plastically worked surface.
- a coil expander with a flat outer peripheral surface can be obtained without performing post-coiling such as grinding and cutting.This is effective on cost and efficiency with less waste of material! Have.
- the wire material for a coil expander of the present invention is used for the coil expander of a combination piston ring having a piston ring and a coil expander for urging the piston ring radially outward,
- the surface of the wire for the coil expander which is the outer peripheral surface of the coil expander (hereinafter, may be referred to as the outer peripheral surface), is formed in a convex curved shape.
- FIG. 1 is a schematic cross-sectional view showing an example of a wire for a coil expander of the present invention.
- the coil expander wire 1 of the present invention when formed into a coil shape into a coil expander, has an outer peripheral surface 2 serving as an outer peripheral surface of the coil expander, It is composed of a surface to be the inner peripheral surface of the coil expander (hereinafter, sometimes referred to as the inner peripheral surface) 3 and two side surfaces 4 and a force.
- the wire material for a coil expander of the present invention is characterized in that its outer peripheral surface 2 is formed in a convex curved surface.
- FIG. 2 which is an explanatory view illustrating a state in which the wire for a coil expander of the present invention is bent into a coil shape
- a wire 1 for a coil expander is bent into a coil shape to produce a coil expander.
- a force acts in the direction in which the coil expander is pulled on the outer peripheral surface 10 of the coil expander, the effect of deformation due to this force is avoided.
- the outer peripheral surface side surface 2 of the coil expander wire 1 serving as the outer peripheral surface of the coil expander is given a thickness as shown in FIG. 1 in advance.
- the inner peripheral surface 3 is formed into a concave curved surface so as to have a rectangular cross section. It is possible to manufacture coiled expansive shapes.
- FIG. 3 is a schematic cross-sectional view of a coil expander formed by using the above-described coil expander wire in a cross section including the axial direction y of the coil expander.
- the cross-sectional shape 61 of the coil expander wire in Fig. 3 is FIG. 2 corresponds to a schematic sectional view of the coil expander wire 1 shown in FIG.
- the thickness of the coil expander wire means the length of the coil expander wire in the radial direction X of the coil expander when wound into a coil as shown in FIG.
- the width of the panda wire means the length of the coil expander wire in the axial direction y of the coil expander. Specifically, in the cross-sectional shape 61 of the coil expander wire, the length in the radial direction X of the coil expander corresponds to the thickness 63 of the coil expander wire, and the length in the axial direction y of the coil expander. This corresponds to the width 62 of wire for coil expander.
- the wire material for a coil expander of the present invention is used for the coil expander of a combined piston ring having a piston ring and a coil expander for urging the piston ring radially outward,
- the cross-sectional shape is rectangular.
- the combination piston ring having the coil expander manufactured using the coil expander wire of the present invention at least a coil expander formed of the coil expander wire of the present invention and a piston ring
- the piston ring used for the combination piston ring in the present invention is preferably an oil ring. This is because the effects of the present invention can be fully utilized, and a combined oil ring excellent in reduction of friction, oil removal function, oil control function, and the like can be obtained. Therefore, the combination piston ring in the present invention is preferably a combination oil ring. Specific examples of the combination oil ring include a two-piece oil ring, a three-piece oil ring, a four-piece oil ring, and the like. Can be.
- the cross-sectional shape of the coil expander wire of the present invention is rectangular, and when the coil expander is formed, the outer peripheral surface of the coil expander wire that is the outer peripheral surface of the coil expander is It is characterized by being formed in a convex curved surface shape.
- the coil expander wire when the coil expander wire is bent into a coil shape, the coil expander wire is deformed in consideration of the deformation of the coil expander wire due to tensile stress generated on the outer circumferential surface of the coil expander.
- Outer surface of wire for coil expander Are formed in a convex curved surface shape. Thereby, even when the outer peripheral surface side surface is elongated and deformed during coiling, a coil expander that does not deform into a concave shape is arranged. For example, the problem of local sliding with respect to the inner circumferential groove of the oil ring can be solved.
- the rectangular shape here means a square and a rectangle, etc., but also includes a degree that can be regarded as a square such as a square and a rectangle as a whole, and the corners or surfaces have a slight curvature and are rounded. This includes cases such as the following.
- the height of the curved surface is such that it does not deform into a concave shape when bent into a coil shape.
- it is preferably in the range of 0.03 mm to 0.1 mm, particularly preferably in the range of 0.04 mm to 0.08 mm.
- the coil expander is formed on the curved surface in the above range, the outer peripheral surface can be formed into a planar shape without performing centerless processing such as cutting in the finally obtained coil expander, and the coil expander is arranged. For example, this is because surface sliding can be performed on the inner circumferential groove of the oil ring.
- the height of the curved surface indicates the degree of swelling at a portion where the swelling is largest among the outer peripheral surface side surfaces formed in a convex curved shape. Specifically, as shown in Fig. 1, the distance a between the straight line e connecting the ends c and d of the outer peripheral surface formed on the convex curved surface and the vertex f of the convex curved surface is shown. Things.
- the radius of curvature R of the curved surface is in the range of 0.8 mm to 1.4 mm, and particularly in the range of 0.8 mm to 1.2 mm. It is preferred that If the radius of curvature R is smaller than the above range, when formed as a coil expander, the shape after deformation may be a convex curved surface, which is not preferable because the contact area becomes small. On the other hand, if the radius of curvature R is larger than the above range, it may be deformed in a concave shape, which is not preferable.
- the radius of curvature of the outer peripheral surface is the radius of curvature of the arc R2 indicated by a dashed line in FIG.
- the shape of the inner peripheral surface of the coil expander wire that is the inner peripheral surface of the coil expander is particularly limited. It is not done.
- the inner peripheral surface 3 can take various shapes such as a flat surface, a concave curved surface, and a convex curved surface.
- the present invention it is preferable that the inner peripheral surface is formed in a concave curved surface.
- the inner peripheral surface of the coil expander is deformed in a convex shape. Since such a coil expander has a single contact with the core material inserted inside, it is necessary to reduce the diameter of the core material for fitting with the core material. Therefore, in the present invention, the inner peripheral surface of the coil expander wire, which is the inner peripheral surface of the coil expander, is formed into a concave curved surface, so that when formed as a coil expander, The inner peripheral surface is prevented from being deformed in a convex shape, and wear and damage on the inner peripheral surface of the coil expander are reduced.
- the radius of curvature of the inner peripheral surface is the radius of curvature of the arc R3 indicated by a dashed line in FIG.
- the outer peripheral surface side surface formed in the curved surface shape and the inner peripheral surface side surface are formed.
- the relationship between the height of the curved surface and the peripheral surface is as follows: a is the height of the curved surface on the outer peripheral surface formed in the convex curved surface, and the inner peripheral surface is formed in the concave curved surface. Assuming that the height of the curved surface on the side surface is b, it is preferable that a ⁇ b + 0.005 mm.
- the outer peripheral surface and the inner peripheral surface formed into a curved surface are in a positional relationship facing each other. This is because the outer peripheral surface formed on the convex curved surface is the portion that becomes the outer peripheral surface of the coil expander, and the inner peripheral surface formed on the concave curved surface is the inner peripheral surface of the coil expander. It is because it is a part which becomes.
- the shapes of the outer peripheral surface and the inner peripheral surface can be made flat, for example, As a result, the surface slides with respect to the inner circumferential groove of the oil ring, the core material, and the like, so that the amount of wear can be reduced as a whole.
- the height of the curved surface on the inner peripheral surface formed in the concave curved surface as referred to herein refers to the most concave portion of the inner peripheral surface formed in the concave curved surface.
- the wire for coil expander of the present invention is preferably formed so that the end in the width direction of the wire for coil expander is rounded, even when the cross-sectional shape is rectangular.
- the shape of the roundness is not particularly limited, but is located at both ends in the width direction of the coil expander wire on the surface of the coil expander wire formed in the convex curved shape. It is preferable that the radius of curvature of the curved surface at the end of the outer peripheral surface is smaller than the radius of curvature of the curved surface at the central portion of the outer peripheral surface located at the center in the width direction of the wire for the coil expander. Such a shape is referred to as a first form of a coil expander wire). Specifically, as illustrated in FIG.
- outer peripheral surface side surface ends 6 a portion forming the entire curved surface shape as the outer peripheral surface 2 is defined as an outer peripheral surface center 5, and the width direction of the outer peripheral surface 2 is Curved surfaces located at both ends of the outer peripheral surface and having a different radius of curvature from the outer peripheral surface side central portion 5 are referred to as outer peripheral surface side surface ends 6.
- the radius of curvature of each curved surface is such that the radius of curvature of the central portion 5 of the outer peripheral surface is within the range of 0.8 mm—1.4 mm, which is the same as the radius of curvature of the outer peripheral surface 2 described above.
- the radius of curvature of the outer peripheral surface side surface end 6 is in the range of 0.03 mm-0.2 mm, preferably in the range of 0.8 mm-1.2 mm, and preferably in the range of 0.05 mm-0.1 mm. It is preferably within. If the radius of curvature of the outer peripheral surface side surface end 6 is smaller than the above range, the effect of the rounded shape may not be sufficiently obtained. On the other hand, if the radius of curvature is larger than the above range, it may be difficult to process the outer peripheral surface side surface end 6 into such a shape.
- the ratio of the outer peripheral surface side surface end 6 and the outer peripheral surface side surface central portion 5 as described above is not particularly limited.
- the length of the outer peripheral surface 2, that is, the width 62 of the coil expander wire is L
- the length of the outer peripheral surface center 5 is M
- the outer peripheral surface end located at both ends thereof is M.
- L: M: 2N is in the range of 1: 0.7—0.95: 0.05—0.3
- L: M: 2N is 1: It is preferably within the range of 0.75-0. 9: 0.1-0.25.
- the inner peripheral surface of the coil expander wire is formed by a concave curved surface. In the same manner as in the case of the outer peripheral surface side, it is located at both ends in the width direction of the coil expander wire on the surface of the coil expander wire formed in the concave curved shape. Radius of curvature of the curved surface at the end of the inner peripheral surface is smaller than the radius of curvature of the curved surface at the center of the inner peripheral surface located at the center in the width direction of the coil expander wire rod.
- the inner peripheral surface side central portion 7, which is a part of the overall curved surface shape as the inner peripheral surface 3, is a concave curved surface.
- the inner peripheral surface end 8 located at both ends of the inner peripheral surface 3 and having a different radius of curvature from the inner peripheral surface center 7 is formed by a convex curved surface. .
- the radius of curvature of the central portion 7 on the inner peripheral surface side is in the range of 0.8 mm-1.4 mm, and particularly in the range of 0.8 mm-1.2 mm.
- the radius of curvature of the surface-side surface end 8 is preferably in the range of 0.05 mm to 0.2 mm, and more preferably in the range of 0.05 mm to 0.1 mm.
- the ratio of the inner peripheral surface end 8 to the inner peripheral surface center 7 as described above in the inner peripheral surface 3 is not particularly limited.
- the length of the inner peripheral surface 3, that is, the width 62 of the coil expander wire is L
- the length of the inner peripheral surface center 7 is S
- the length of the inner peripheral surface 3 is S.
- L: S: 2T force 1: 0.7-0.95: 0.05-0.3 especially: It is preferred that L: S: 2T is in the range of 1: 0.75—0.9: 0.1—0.25.
- the inner peripheral surface side surface 3 of the coil expander wire when the inner peripheral surface side surface 3 of the coil expander wire is formed in a convex curved shape, the inner peripheral surface side surface end is similarly formed.
- the radius of curvature of the curved surface of the portion 8 is preferably smaller than the radius of curvature of the curved surface of the central portion 7 on the inner peripheral surface side (hereinafter, such a shape is referred to as a third embodiment of the coil expander wire).
- the radius of curvature of the central portion 8 of the inner peripheral surface is in the range of 0.8 mm—1.4 mm, and particularly in the range of 0.8 mm—1.2 mm.
- the radius of curvature of the surface-side surface end 7 is preferably in the range of 0.05 mm to 0.2 mm, and more preferably in the range of 0.05 mm to 0.1 mm.
- the ratio of the inner peripheral surface end 8 and the inner peripheral surface center 7 as described above is not particularly limited.
- the length of the inner peripheral surface 3, that is, the width 62 of the coil expander wire is L
- the length of the inner peripheral surface central portion 7 is S
- the length of the inner peripheral surface 3 is S.
- L: S: 2T force 1: 0.7-0.95: 0.05-0.3 especially: It is preferred that L: S: 2T is in the range of 1: 0.75—0.9: 0.1—0.25.
- the height a of the curved surface of the outer peripheral surface is equal to the outer peripheral surface.
- the height at the center of the surface, and the height b of the curved surface on the inner peripheral surface is the height at the center of the inner peripheral surface.
- the height a is “a straight line connecting the ends of the outer peripheral surface (ends c and d in FIG. 1). And the distance between the vertex of the surface (vertex f in Fig. 1).
- the height a is defined as the height between the ends of the outer peripheral surface center. Is the distance between the straight line connecting the vertices and the vertex of the curved surface, and indicates, for example, the height a in FIG.
- the height b of the curved surface on the inner peripheral surface is also the distance between the straight line connecting the ends of the central portion of the inner peripheral surface and the vertex of the curved surface. shall point to b.
- the wire for the coil expander has a flat side force. Since the side surface is flat, it is possible to prevent the coil expander wire from being twisted when the coil expander wire is formed into a coil shape to form a coil expander.
- the length of the flat side surface is not particularly limited. However, as illustrated in FIG. 4, when the length of the side surface is W, W is between 0.3 mm and 0.8 mm. It is preferable that it is within the range. Further, the length W of the side surface 4 is preferably in the range of 35% to 80% of the thickness 63 of the wire for the coil expander shown in FIG. 4 and the like. By setting the W value and the ratio within the above ranges, the twist of the coil expander wire can be more reliably prevented.
- the material for forming such a wire for a coil expander is not particularly limited as long as it is a commonly used material.
- a shape memory alloy is preferable. Shape memory alloys are the most flexible of the above metals, and are particularly large in deformation due to tension and compression forces generated when bent into a coil shape, so that the effects of the present invention can be fully utilized. .
- the tension can be changed in accordance with the operating state of the engine. For example, in the case where the combined piston ring in the present invention is a combined oil ring, the oil is removed. In addition to improving the functions and oil control function, it is also a force that can reduce friction.
- a shape memory alloy is in a martensitic state (M phase) at room temperature and is in an austenite state (A phase) at high temperature.
- the transformation of the martensitic state force to the austenite state is called reverse martensitic transformation, and the transformation of the austenite state force to the martensitic state is called martensitic transformation.
- the temperature at which such transformation occurs is hereinafter referred to as martensite transformation temperature.
- the martensitic transformation temperature has a certain temperature range and is determined from peaks of an endothermic reaction and an exothermic reaction by a suggestive thermal analysis.
- a certain temperature for example, a martensitic transformation temperature of 10 ° C in the case of TiM system. It has a phenomenon of returning to its original shape when heated to 100 ° C or more, that is, it has a shape memory effect.
- a coil expander manufactured using the coil expander wire rod of the present invention is used.
- the temperature rises above the martensitic transformation temperature it is preferable to treat the coil expander wire so that the coil expander extends in the longitudinal direction. The reason will be described in detail in “B. Coil expander” described later.
- examples of the shape memory alloy that can be used for the wire for a coil expander of the present invention include TiNi-based, Cu-Zn-A1-based, and Fe-Mn-Si-based.
- Ti Ni is most preferred in the present invention. This is because they are most superior in terms of strength, fatigue resistance and corrosion resistance.
- the ratio is preferably 50 atomic% Ni and 51 atomic% Ni for Ti! / ,.
- the martensitic transformation temperature be in the range of 10 ° C to 200 ° C.
- the temperature is preferably in the range of 30 ° C to 90 ° C.
- the martensitic transformation temperature can be changed by the composition of the shape memory alloy, heat treatment when producing the shape memory alloy, or the like. By adjusting the martensitic transformation temperature within the above range, the coil extract of the present invention can be changed.
- the specific force between the thickness and the width in the cross-sectional shape is in the range of 1: 1-1: 4, and among them, 1: 2-1. : 3.5, especially preferably in the range of 1: 2.5-1: 3.
- the ratio of the width to the length is larger than the above range, when manufacturing the coil expander, at a predetermined pitch, a gap between adjacent wires is narrowed, and it is difficult to bend at a predetermined curvature. This is not preferable because it may occur.
- the width ratio is smaller than the above range, when wound at a predetermined pitch, the gap formed between adjacent wires becomes wider, so that sufficient tension cannot be obtained! Some power is not good.
- the pitch means a length from the center of the wire to the center of the adjacent wire in one rotation of the wire when the wire for the coil expander is wound in a coil shape.
- the wire rod for a coil expander having a shape memory alloy force according to the present invention has an oil ring whose thickness is, for example, as shown in FIG.
- a combined oil ring it is preferably in the range of 0.2 mm to 0.5 mm, and more preferably in the range of 0.25 mm to 0.3 mm.
- the thickness is smaller than the above range, the reaction force of the panel becomes weak when formed as a coil expander, and sufficient tension may not be obtained. It is not preferable because the coil expander cannot have a diameter.
- the coil expander of the present invention can be divided into two embodiments. Hereinafter, the coil expander of the present invention will be described separately for the first embodiment and the second embodiment.
- the coil expander of this embodiment is characterized by being formed using the above-described coil expander wire.
- the coil expander wire is formed in anticipation of deformation when formed as a coil expander, it is not necessary to perform post-processing such as polishing or cutting after coiling.
- a coil expander having a planar outer peripheral surface shape can be obtained. Therefore, in the case of a coil expander manufactured using the above-described coil expander wire, inconveniences such as abnormal wear and a decrease in strength are unlikely to occur, and cost reduction and simplification of the manufacturing process can be achieved.
- FIG. 5 is a schematic sectional view illustrating an example of a combination oil ring using the coil expander of the present embodiment.
- the combination oil ring in the present embodiment has a substantially I-shaped cross section in which a coil expander 40 manufactured using the above-described coil expander wire and two rails 41 and 42 are connected by a columnar web 44. It has an oil ring 45.
- the oil ring 45 slides on the inner wall 21 of the cylinder bore 20 on the sliding surface 46.
- the outer peripheral groove 47 formed by connecting the rails 41 and 42 with the web 44 is This is a groove for receiving the lubricating oil removed by the sliding surface 46, and the lubricating oil received in the outer circumferential groove 47 passes through a number of oil holes 48 provided in the web 44, and Move toward the inner circumference of ring 45.
- an oil ring 45 is urged radially outward of the oil ring 45, and an inner wall of the cylinder is formed.
- a coil expander 40 for pressing a roll ring 45 on 21 is arranged.
- the coil expander 40 is formed using the above-described coil expander wire.
- the temperature of the coil expander itself becomes higher than the martensite transformation temperature, the transverse elastic modulus of the expander material changes greatly, and the tension (tension) as a coil expander changes greatly.
- the temperature is 6000-9000MPa in the low temperature phase (martensite phase), about 20000MPa in the high temperature phase (austenite phase), and about 20000MPa as coil expander. — There is a three-fold change in tension.
- the coil expander when the engine is started, since the engine temperature and the like are lower than the martensitic transformation temperature, the coil expander has a low tension based on the low transverse elasticity coefficient and reduces the sliding friction between the piston ring and the cylinder bore. As a result, the friction on the sliding surface generated when the engine is warmed up can be reduced.
- the coil expander of this embodiment having such advantages is manufactured using the above-described coil expander wire. Also for the coil expander mentioned above Since the material for forming the wire is preferably a shape memory alloy, it is preferable that the coil expander of the present embodiment also has a shape memory alloy force.
- the shape memory alloy is kept at a temperature below the martensitic transformation temperature, and after the alloy is deformed and the load is removed, a certain temperature (for example, the martensitic transformation temperature in TiM system—10 ° C) It has the phenomenon of returning to its original shape when heated above C-100 ° C), that is, it has a shape memory effect.
- the temperature at which the alloy returns to the previously stored shape is defined as the martensitic transformation temperature.
- a desired tension is obtained.
- the coil expander is subjected to memory processing in consideration of the shrinkage margin so that a desired tension is obtained in the high-temperature phase (austenite phase).
- both ends of the coil expander are fixed at both low temperature and high temperature, so that the tension changes due to the change in the lateral elasticity coefficient in the expanded and contracted state.
- the coil expander since the engine temperature and the like at the time of starting the engine are lower than the martensitic transformation temperature, the coil expander does not exhibit sufficient tension to extend in the longitudinal direction. Therefore, it is necessary to increase the surface pressure of the oil ring so that the startability is reduced. Therefore, there is an effect that the startability of the engine can be improved.
- the tension of the coil expander in the present embodiment is, for example, 1N when the coil expander used for the h dimension 2. Omm or less shown in FIG. — It is preferably in the range of 30N, and especially in the range of 1N-15N.
- the engine is warmed up and the engine temperature is gradually increasing.Therefore, if the coil expander has a tension within the above range, it is necessary to improve the startability of the engine. Because it can be.
- the tension after the martensitic transformation is not particularly limited, for example, when the combination piston ring in the present invention is used as a combination oil ring, as long as the oil ring function is not impaired.
- the coil expander is used for h dimension 2.Omm or less as shown in Fig. 5, it should be within the range of 3N-40N, and especially within the range of 3N-20N. preferable. In general, it is effective to reduce the surface pressure of the oil ring to reduce friction.By adjusting the tension after the martensitic transformation of the coil expander to within the above range, it is possible to reduce friction, It is a power that can improve fuel efficiency.
- the material forming the coil expander and the martensite transformation temperature in the present embodiment are the same as those described in the above-mentioned "A. Wire for coil expander", and thus description thereof will be omitted. .
- the coil expander according to the present embodiment is a coil expander for the above-described coil expander. Since it is manufactured using a wire, the cross-sectional shape can be rectangular. Thereby, for example, even when the coil diameter of the coil expander is made small enough to be installed in the inner circumferential groove of the thinned oil ring, sufficient tension can be exhibited, and the shape memory can be obtained. This solves the problem of insufficient tension in the coil expander, which also has high alloy strength.
- the pitch at which the coil is bent into a coil shape is determined according to the coil diameter of the coil expander. It is determined substantially within a predetermined range.
- the pitch means the length from the center of the wire to the center of the adjacent wire in one rotation of the wire when the wire is wound in a coil shape.
- the coil diameter of the coil expander here means the outermost length of the coil expander in the radial direction, and specifically, d shown in FIG. Pointing force Specifically, this coil diameter is, for example, the h dimension shown in Fig. 5.
- a coil expander of 2 mm or less it is preferably in the range of 0.3 mm to 1.8 mm, and more preferably in the range of 0.3 mm to 1.4 mm. This is because if the coil diameter is within the above range, for example, a thin oil ring can be used.
- the pitch is, for example, in the range of 0.3 mm to 1.8 mm for a coil expander having an h dimension of 2 mm or less, and 0.3 mm to 1 mm. It is almost specified within the range of 4mm. Further, the pitch is preferably uniform.
- the winding method may be as follows.
- the long side force in the cross-sectional shape of the coil expander wire is the circumference of the S coil expander. It is preferable to wind to form a direction. This is because the coil diameter of such a coiling force coil expander can be minimized, and a reaction force as a panel can be sufficiently generated, so that a desired tension can be obtained.
- the coil expander of the present embodiment has an oil ring and the oil ring
- the coil expander is formed of a shape memory alloy and has a rectangular cross-sectional shape. And its outer peripheral surface is flat.
- the cross-sectional shape is rectangular and the outer peripheral surface is flat, it can be slid on the inner peripheral groove of the oil ring in which the coil expander is arranged. Therefore, it is possible to solve the problem of the occurrence of abnormal wear and the accompanying decrease in strength, which is effective in improving the function of the combined oil ring. Furthermore, since it is a coil expander with shape memory alloy strength, the tension can be changed in accordance with the operating state of the engine, so the oil removal function and the oil control function can be improved and the friction can be reduced. Reduction can also be achieved.
- the outer peripheral surface is a plastic kamune surface.
- the plastically worked surface means a surface that has not been subjected to a treatment such as polishing or cutting.
- the outer peripheral surface by forming the outer peripheral surface as such a plastic kneaded surface, it is possible to obtain a coil-expander having a planar outer peripheral surface shape without performing kneading such as polishing and cutting after coiling. As a result, it is effective in terms of cost and efficiency with less waste of materials.
- the wire As a wire forming such a coil expander, even if the wire is deformed by the action of a force such as tension or compression when bent into a coil, processing such as grinding or cutting is performed. It is preferable that the wire be a wire capable of flattening the outer peripheral surface of the coil expander without performing the above. Specifically, by using the above-described coil expander wire, such a coil expander can be formed.
- the present invention is not limited to the above-described embodiment.
- the above-described embodiment is an exemplification, and has substantially the same configuration as the technical idea described in the claims of the present specification and has the same effect regardless of what is provided. It is included in the technical scope of the present invention.
- a sliding property confirmation test was performed by the following method.
- a coil expander is manufactured using a coil expander wire having the cross-sectional shape shown in Table 1 below on the outer circumferential surface of the coil expander wire, which is the outer circumferential surface of the coil expander, and the manufactured coil expander is oiled.
- a unit test shown in Fig. 7 was performed by assembling the ring.
- the dimensions of the coil expander wires used were set to 0.3 mm for 63 and 0.85 mm for 62 in the dimensions shown in Fig. 4, and 1.1 mm for d shown in Fig. 6.
- the diameter of D1 was 82 mm
- the diameter of D2 was 79 mm
- the number of revolutions was 700 rpm
- the oil ring 71 was attached to the piston 70, and this was set in the cylinder bore 72.
- the rotation of the motor (not shown) was converted to the stroke of the piston 70 (up and down movement), and the oil ring 71 was repeatedly expanded and contracted between ⁇ 82 mm and ⁇ 79 mm with this vertical movement.
- the outer-surface-side surface curvature radius is the radius of curvature of the outer-surface surface of the used coil expander wire (the end of the outer-surface surface is rounded.
- the outer peripheral surface side surface center portion is shown.
- a (mm) indicates the height of the curved surface on the outer peripheral surface of the coil expander wire (in Example 8-13, the height at the center of the outer peripheral surface).
- the inner peripheral surface has a concave curved surface shape, and the height a of the outer peripheral surface and the height b of the inner peripheral surface b
- the inner peripheral surface has the same convex curved shape as the outer peripheral surface.
- the respective cross-sectional shapes are shown (see FIG. 4 (a) — (c)).
- the radius of curvature, a value, and M value of the outer peripheral surface side surface and the outer peripheral surface side surface end were obtained from a measurement chart using shape measurement.
- the effect of suppressing local sliding can be obtained by making the outer peripheral surface of the coil expander wire rod convex, and further, the radius of curvature of the outer peripheral surface is reduced to 0. 8—
- the sliding surface between the outer surface of the coil expander and the oil ring is made larger. It also contributes to improving fatigue strength.
- FIG. 1 is a schematic cross-sectional view showing one example of a wire for a coil expander of the present invention.
- FIG. 2 is an explanatory diagram showing a state when a wire for a coil expander is bent into a coil shape.
- FIG. 3 is an explanatory view illustrating a width and a thickness of a wire for a coil expander of the present invention.
- FIG. 4 is a schematic sectional view showing another example of the coil expander wire of the present invention.
- FIG. 5 is a schematic sectional view of a combined oil ring having an example of the coil expander of the present invention.
- FIG. 6 is an explanatory diagram illustrating a coil expander of the present invention.
- FIG. 7 is an explanatory diagram showing a state of a sliding characteristic confirmation test in an example.
- FIG. 8 is a graph showing the results of fatigue strength in Examples.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Wire Processing (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2005516895A JP4358828B2 (ja) | 2004-01-09 | 2005-01-07 | コイルエキスパンダ用線材およびコイルエキスパンダ |
US10/585,477 US7954822B2 (en) | 2004-01-09 | 2005-01-07 | Wire material for coil expander and coil expander |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-003733 | 2004-01-09 | ||
JP2004003733 | 2004-01-09 |
Publications (1)
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WO2005066482A1 true WO2005066482A1 (ja) | 2005-07-21 |
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ID=34747086
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PCT/JP2005/000119 WO2005066482A1 (ja) | 2004-01-09 | 2005-01-07 | コイルエキスパンダ用線材およびコイルエキスパンダ |
Country Status (4)
Country | Link |
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US (1) | US7954822B2 (ja) |
JP (1) | JP4358828B2 (ja) |
CN (1) | CN100510368C (ja) |
WO (1) | WO2005066482A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009180303A (ja) * | 2008-01-31 | 2009-08-13 | Neturen Co Ltd | 異形断面形状を有する緩衝器用スプリング材料 |
JP7116861B1 (ja) * | 2021-03-31 | 2022-08-10 | 株式会社リケン | サイドレール及びこれを備えるオイルコントロールリング |
WO2022209592A1 (ja) * | 2021-03-31 | 2022-10-06 | 株式会社リケン | サイドレール及びこれを備えるオイルコントロールリング |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014224971A1 (de) * | 2014-12-05 | 2016-06-09 | Peri Gmbh | Dichtungsstopfen zum Verschließen eines Ankerlochs einer Betonwand |
JP6399460B2 (ja) * | 2016-09-30 | 2018-10-03 | 株式会社エフエムディ | 医療用ガイドワイヤ |
WO2020067539A1 (ja) * | 2018-09-28 | 2020-04-02 | 日本ピストンリング株式会社 | 内燃機関用オイルリング |
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JPH11230344A (ja) * | 1998-02-20 | 1999-08-27 | Toyota Motor Corp | ピストンリング構造体 |
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DE1760943B1 (de) * | 1968-07-22 | 1972-05-04 | Spaleck Gmbh Max | Webeblatt |
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CH592827A5 (ja) * | 1974-06-26 | 1977-11-15 | Joint Francais | |
JPS521933A (en) | 1975-06-23 | 1977-01-08 | Nippon Telegraph & Telephone | Tunnel excavator |
JPS60101247A (ja) * | 1983-11-07 | 1985-06-05 | Riken Corp | 内燃機関用組合せピストン |
CH655845A5 (de) | 1983-11-17 | 1986-05-30 | Straumann Inst Ag | Einrichtung mit einem schraubstift zum einschrauben in einen zahn und einer spannvorrichtung zum halten des schraubstiftes. |
JPS6392011A (ja) | 1986-10-06 | 1988-04-22 | Nec Corp | 生産工程管理方式 |
JPH0298262U (ja) | 1989-01-23 | 1990-08-06 | ||
JPH0829647A (ja) | 1994-07-18 | 1996-02-02 | Sumitomo Electric Ind Ltd | 発光素子モジュール |
US5542682A (en) * | 1995-03-27 | 1996-08-06 | American Variseal | Slant coil spring and seal |
US6356409B1 (en) * | 1999-12-15 | 2002-03-12 | International Business Machines Corporation | Balancing apparatus and method for high speed hard disk drive spindles |
JP2003074704A (ja) * | 2001-08-31 | 2003-03-12 | Riken Corp | 組合せオイルリング |
JP3953899B2 (ja) * | 2002-04-02 | 2007-08-08 | 日本ピストンリング株式会社 | ピストンリング |
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2005
- 2005-01-07 CN CNB2005800021238A patent/CN100510368C/zh not_active Expired - Fee Related
- 2005-01-07 WO PCT/JP2005/000119 patent/WO2005066482A1/ja active Application Filing
- 2005-01-07 JP JP2005516895A patent/JP4358828B2/ja not_active Expired - Fee Related
- 2005-01-07 US US10/585,477 patent/US7954822B2/en not_active Expired - Fee Related
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JPS60122554U (ja) * | 1984-01-25 | 1985-08-19 | 川崎重工業株式会社 | 内燃機関のピストン装置 |
JPH08296497A (ja) * | 1995-04-27 | 1996-11-12 | Hitachi Metals Ltd | 圧力リング用線材およびその製造方法 |
JPH11230344A (ja) * | 1998-02-20 | 1999-08-27 | Toyota Motor Corp | ピストンリング構造体 |
Cited By (4)
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JP2009180303A (ja) * | 2008-01-31 | 2009-08-13 | Neturen Co Ltd | 異形断面形状を有する緩衝器用スプリング材料 |
JP7116861B1 (ja) * | 2021-03-31 | 2022-08-10 | 株式会社リケン | サイドレール及びこれを備えるオイルコントロールリング |
WO2022209592A1 (ja) * | 2021-03-31 | 2022-10-06 | 株式会社リケン | サイドレール及びこれを備えるオイルコントロールリング |
US11994219B2 (en) | 2021-03-31 | 2024-05-28 | Kabushiki Kaisha Riken | Side rail and oil control ring comprising same |
Also Published As
Publication number | Publication date |
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US20090243225A1 (en) | 2009-10-01 |
CN1910360A (zh) | 2007-02-07 |
JPWO2005066482A1 (ja) | 2007-12-20 |
CN100510368C (zh) | 2009-07-08 |
JP4358828B2 (ja) | 2009-11-04 |
US7954822B2 (en) | 2011-06-07 |
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