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WO2008016010A1 - Segment de piston - Google Patents

Segment de piston Download PDF

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Publication number
WO2008016010A1
WO2008016010A1 PCT/JP2007/064902 JP2007064902W WO2008016010A1 WO 2008016010 A1 WO2008016010 A1 WO 2008016010A1 JP 2007064902 W JP2007064902 W JP 2007064902W WO 2008016010 A1 WO2008016010 A1 WO 2008016010A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston ring
mol
tantalum
shape memory
alloy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2007/064902
Other languages
English (en)
Japanese (ja)
Inventor
Shuichi Miyazaki
Motonobu Onoda
Naoki Okada
Yoshitaka Fujii
Hee Young Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Piston Ring Co Ltd
Original Assignee
Nippon Piston Ring Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Piston Ring Co Ltd filed Critical Nippon Piston Ring Co Ltd
Publication of WO2008016010A1 publication Critical patent/WO2008016010A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F16J9/26—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction characterised by the use of particular materials
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C14/00—Alloys based on titanium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/02—Alloys based on vanadium, niobium, or tantalum

Definitions

  • the present invention relates to a piston ring. More specifically, the present invention relates to a variable tension piston ring that is disposed in a piston ring groove of a piston in an internal combustion engine used for an automobile, a lawn mower, a generator, etc., and in which the tension in a high temperature state is increased compared to the tension in a low temperature state. .
  • Piston rings are roughly classified into two types: pressure rings and oil rings.
  • the piston ring is composed of only one piston ring, the piston ring body, and this piston ring.
  • an expander is disposed on the inner peripheral surface side of the main body to apply a pressing force in the direction of expanding the piston ring main body.
  • the tension in such a piston ring is usually set so that the piston ring can perform its function even under the most severe conditions in which the piston ring can be used.
  • the tension of the piston ring is set assuming a high speed and high load state of the internal combustion engine.
  • the tension of the piston ring is designed assuming a high speed and high load state.
  • the piston ring is composed of a piston ring main body and an expander
  • the sum of the tension of the piston ring main body and the expander is similarly designed assuming a high speed and high load state.
  • a piston ring has been developed that can change the tension of the piston ring between a low temperature and a high temperature by forming the piston ring from a shape memory alloy.
  • the piston ring in a piston ring composed of only one piston ring, the piston ring is formed of a nickel-titanium-based shape memory alloy.
  • a technique is disclosed in which the piston ring and the cylinder inner peripheral surface are brought into non-contact and the piston ring and the cylinder inner peripheral surface are brought into contact with each other only when a high temperature is reached! (See paragraphs, etc.)
  • Patent Document 2 in the piston ring composed of a piston ring main body and an expander (coil expander), the expander is formed of a nickel titanium-based shape memory alloy as in Patent Document 1. By doing so, a technique for increasing the tension in the high temperature state than the tension in the low temperature state is disclosed (see the claims of the utility model registration in Patent Document 2).
  • Patent Document 3 discloses a shape memory alloy characterized by adding palladium to nickel-titanium for the purpose of transformation at a higher temperature.
  • Patent Document 4 discloses a shape memory alloy characterized by adding zirconium (or hafnium) to nickel titanium for the same purpose as Patent Document 3.
  • Patent Document 5 discloses a shape with a wide range of transformation temperatures and excellent workability.
  • a shape memory alloy characterized by adding niobium to nickel titanium is disclosed.
  • Patent Document 1 Japanese Patent Laid-Open No. 06-0666371
  • Patent Document 2 Actual Fairness No. 03-041078
  • Patent Document 3 Japanese Patent Laid-Open No. 11 036024
  • Patent Document 4 Japanese Patent Laid-Open No. 10-008168
  • Patent Document 5 Japanese Patent Application Laid-Open No. 61-119639
  • the current piston ring does not completely solve the problem of friction loss, and needs to be improved to further improve fuel consumption.
  • the piston ring disclosed in Patent Document 1 cannot be applied in a temperature range of 80 ° C. or higher with a force S in which a nickel-titanium alloy is used as a shape memory alloy. The effect cannot be expected in an automobile engine or the like that is subjected to severe temperature conditions.
  • the present invention has been made in view of such a situation, and the tension in the low temperature state and the tension in the high temperature state can be changed within the practical range of the engine, and as a result, the flexion loss is minimized.
  • the main issue is to provide a piston ring that can reduce fuel consumption and improve fuel efficiency.
  • the first piston ring of the present invention for solving the above-mentioned problems is 30 mol% or more 40mol
  • It is characterized by being formed of a titanium tantalum shape memory alloy composed of less than% tantalum, the balance of titanium, and inevitable impurities.
  • the second piston ring of the present invention includes 25 mol% or more and 30 mol% or less of tantalum, lmol% or more and 5 mol% or less of ⁇ -phase stabilizing element, the remaining titanium, and inevitable impurities.
  • It is characterized by being formed of a powerful titanium tantalum shape memory alloy.
  • the third piston ring of the present invention comprises 25 mol% or more and 30 mol% or less of tantalum
  • It is characterized by being formed of a titanium tantalum shape memory alloy composed of an interstitial element of 0.1 mol% or more and 1 mol% or less, the balance of titanium, inevitable impurities, and force.
  • the fourth piston ring of the present invention is inevitable that 20 mol% or more and 30 mol% or less of tantalum, and lmol% or more and 10 mol% or less of tantalum (a three-phase stabilizing element and the remaining titanium). It is characterized by the fact that it is formed by a mechanical impurity and a powerful titanium-tantalum-based shape memory alloy.
  • the fifth piston ring of the present invention has a tantalum of 25 mol% or more and 30 mol% or less, a transition metal element of 0.5 mol% or more and 2 mol% or less, the remaining titanium, unavoidable impurities, force
  • the titanium is formed of a tantalum-based shape memory alloy! /.
  • the sixth piston ring of the present invention is a titanium comprising 25 mol% or more and 30 mol% or less of tantalum, lmol% or more and 10 mol% or less of zirconium, the balance of titanium, unavoidable impurities, force. It is formed of a tantalum-based shape memory alloy.
  • the seventh piston ring of the present invention is a titanium tantalum comprising 25 mol% or more and 30 mol% or less of tantalum, lmol% or more and 5 mol% or less of tin, the remaining titanium, and inevitable impurities. It is formed of a system shape memory alloy.
  • the eighth piston ring of the present invention comprises 20 mol% or more and 30 mol% or less of tantalum, an additive element added so that the total tantalum equivalent is 30 mol% or more and 39.5 mol% or less, and the balance It is formed of titanium, unavoidable impurities, and force, and is formed of titanium tantalum shape memory alloy.
  • the additive element force ⁇ -phase stabilization An element, an interstitial element, a / 3-phase stabilizing element, and a transition metal element.
  • the additive element includes zirconium of 1 mol% or more and 5 mol% or less, an ⁇ -phase stabilizing element, an interstitial element, and a / 3-phase stabilizing. And at least one element selected from the group consisting of elements and transition metal elements.
  • the additive element is tin of lmol% or more and 2mol% or less, an ⁇ -phase stabilizing element, an interstitial element, and a / 3-phase stabilizing It has at least one kind of element and transition metal element.
  • the piston ring of the present invention includes a piston ring main body and an expander disposed on the inner peripheral surface side of the piston ring main body.
  • the piston ring main body and the expander Both or any one of them may be formed of the shape memory alloy.
  • the expander may be either a coil expander or a plate expander.
  • the piston ring of the present invention includes a side rail and a spacer expander, and either or both of the side rail and the spacer expander are used.
  • One is made of the shape memory alloy! /
  • the tension at a temperature lower than the reverse transformation peak temperature of the shape memory alloy is 0.;! To 25 ⁇ , and the reverse transformation peak temperature of the shape memory alloy It is preferable that the tension at the above temperature is 0.2 to 55 mm.
  • the piston ring of the present invention may be used as an oil ring or a pressure ring.
  • the piston ring of the present invention is formed by the above-mentioned titanium tantalum-based shape memory alloy! /, So that it has a high temperature of 80 ° C or higher! /, Transformation temperature (transformation peak temperature (M *)) Or reverse transformation peak temperature (A *)) can be realized. Therefore, in low temperature and low load conditions, it will exhibit an appropriate low tension, but will transform when it reaches a high temperature and high load condition of 80 ° C or higher. Therefore, it is possible to provide a piston ring that can exert higher tension than a low temperature and low load state. As a result, friction loss in a low temperature and low load state can be minimized, and fuel consumption can be improved.
  • a titanium tantalum-based shape memory alloy having such a component composition has a transformation strain ( ⁇ ).
  • the recovery strain ( ⁇ ) is small and the recovery rate is high, it can withstand repeated use at high temperatures.
  • a shape memory alloy having such a component composition is excellent in workability because it has a higher rolling ratio in cold working than a conventional shape memory alloy. Therefore, the desired shape
  • the piston ring of the present invention there is no problem even if the piston ring is composed of a piston ring main body and an expander arranged on the inner peripheral surface side of the piston ring main body. If at least one of the main body and the expander is formed of the shape-memory alloy, the same effect as described above can be obtained, and the expander can be either a coil expander or a plate expander. It is the same even if it is.
  • the piston ring according to the present invention includes a side rail and a spacer expander, and both or one of the side rail and the spacer expander is the above-mentioned. Even if it is made of shape memory alloy! /, The same effect can be obtained with force S.
  • the tension at a temperature lower than the reverse transformation peak temperature of the shape memory alloy (temperature assuming starting of the engine: 30 to 50 ° C) is 0. 1 to 25N
  • the tension at the temperature higher than the reverse transformation peak temperature of the shape memory alloy (temperature assuming high speed rotation after the engine starts, temperature after austenite transformation) is in the range of 0.2 to 55N
  • piston ring of the present invention can exhibit the above-described effects even if it is used as either an oil ring or a pressure ring.
  • FIG. 1 is an explanatory diagram of a shape memory characteristic evaluation test.
  • FIG. 1A is an explanatory diagram of a typical strain temperature curve of an alloy showing a repeated shape memory characteristic
  • FIG. 1B is a repeated shape memory characteristic.
  • FIG. 3 is an explanatory diagram of a typical strain temperature curve of an alloy.
  • FIG. 2 Explanatory diagram of experimental results of Ti Ta binary alloy of the material example of the present invention.
  • Fig. 2A is an explanatory diagram of the relationship between the molar fraction of Ta and the transformation start temperature (Ms) under 50MPa.
  • FIG. 2B is an explanatory diagram of strain temperature curves of Ti 32 Ta and Ti-40Ta.
  • FIG. 3 is an explanatory diagram of a strain temperature curve of a Ti 27Ta binary alloy of the material example of the present invention.
  • FIG. 4 is an explanatory diagram of a strain temperature curve of a Ti 22Nb binary alloy as a comparative material example.
  • FIG. 5 is a schematic sectional view of an example of the piston ring of the present invention.
  • FIG. 6 is a schematic cross-sectional view showing another example of the piston ring of the present invention
  • FIG. 6 (a) is a schematic cross-section of a piston ring 40 composed of a piston ring main body 41, a coil expander 42, and a force
  • FIG. 6B is a schematic cross-sectional view of the piston ring 50 including the piston ring main body 51 and the plate expander 52.
  • 6 (c) to (e) are schematic cross-sectional views of the side rings 44, 61, 71 and the spacer rings 45, 62, 72, and the piston rings 43, 60, 70 composed of forces. It is.
  • the piston ring of the present invention includes
  • Titanium tantalum shape memory consisting of 20 mol% or more and 30 mol% or less tantalum, lmol% or more and 10 mol% or less of tantalum and / 3-phase stabilizing element, the balance of titanium, and inevitable impurities Alloy,
  • the additive element includes zirconium having a concentration of 1 mol% or more and 5 mol% or less, and at least one element of an ⁇ -phase stabilizing element, an interstitial element, a / 3-phase stabilizing element, and a transition metal element ( 8) Titanium tantalum shape memory alloy,
  • the additive element has lmol% or more and 2mol% or less of tin and at least one element of ⁇ -phase stabilizing element, interstitial element, / 3-phase stabilizing element and transition metal element.
  • the piston ring of the present invention is characterized by the titanium tantalum-based shape memory alloy as the material. Therefore, first, the characteristics of the titanium tantalum-based shape memory alloy, which is the feature, will be described in detail with various experimental examples.
  • Examples of materials that can be used for the piston ring of the present invention (hereinafter referred to as “material examples of the present invention”), alloys 1 to 35 having the alloy compositions shown in Tables 1 to 7 below, and Tests of alloys 36 to 40 having the alloy compositions shown in Table 8 as examples of materials that cannot be used for the biston ring, that is, examples of materials other than the above components (hereinafter referred to as “comparative material examples”) A piece was made and tested.
  • test piece used in the experiment was prepared by the following methods (1) to (3).
  • alloy l Ti—36Ta
  • alloy 4 Ti-30 Ta—1A1
  • alloy 4 Ti-30 Ta—1A1
  • the produced alloy ingot is cold-rolled by a cold rolling mill at a rolling rate of 80% to 95% to produce a plate material.
  • a test piece having a length of 40 mm, a width of 1.5 mm, and a thickness of 0.1 mm is cut out from the plate material.
  • Fig. 1 is an explanatory diagram of a shape memory characteristic evaluation test
  • Fig. 1A is an explanatory diagram of a typical strain temperature curve of an alloy exhibiting a repeated shape memory characteristic
  • Fig. 1B shows a repeated shape memory characteristic. It is explanatory drawing of the typical strain temperature curve of the alloy which is not.
  • the transformation temperature of each alloy is the heat treatment of the cold-rolled material at 700 ° C for 1 hour, the differential scanning calorimetry (DSC), the martensitic transformation peak temperature (M * point), and the reverse transformation. Peak temperature (A * point) was measured.
  • the reverse transformation peak temperature obtained by differential scanning calorimetry is obtained when the temperature of the martensite phase (hereinafter sometimes referred to as "M phase") is increased from low temperature to the austenite phase (hereinafter referred to as "A"). Phase))) and the temperature rises and the M phase is reached. This is the intermediate temperature to the temperature at which reverse transformation to A phase is completed (Af temperature) (As temperature ⁇ reverse transformation peak temperature ⁇ Af temperature).
  • the transformation temperature which is a shape memory property, is obtained by performing a thermal cycle test (-100 ° C to 300 ° C) under a constant stress (lOOMPa) using a tensile tester.
  • (As, M s) and shape recovery rate (%) were evaluated. That is, almost the same strain temperature curve as shown in FIG. 1A was measured for the alloys of the present invention material showing shape memory characteristics;! To 12 and alloy 40, and As (inverse) was measured from the measured strain temperature curve. Transformation start temperature) and Ms (martensitic transformation start temperature), transformation strain ⁇ , recovery strain ⁇ , and shape recovery rate ( ⁇ ⁇ / ⁇
  • Alloy 36 to Alloy 40 that is, a comparative material example in which shape memory characteristics were not observed from the second cycle, almost the same strain temperature curves as shown in Fig. 1B were measured and measured. From the strain temperature curve, As (reverse transformation start temperature) in the first cycle was measured.
  • tantalum equivalents (Ta equivalents) described in Tables 1 to 8 below are calculated by the following formula (1).
  • Ta equivalent (mol%) Ta (mol%) + 2.9 X Al (mol%) + 5.6 X Si (mol%) + 8.3 X (N (mol%) + B (mol% ) + C (mol%) +0 (mol%) + Mo (mol%) ⁇ + 3.9XV (mol%) + l.7XNb (mol%) + 6.4 X (Fe (mol%) + Mn (mol%) ⁇ + 5.0X ⁇ Co (mol%) + Cr (mol%) ⁇ + 4.2 X Ni (mol%) + 1.1 XZr (mol%) + 2.8XSn (mol%
  • Ta equivalent equation (1) corresponds to the effect of changing the transformation temperature of the alloy when Ta or an element other than Ta is added. This is a formula for calculating (converting) force. This equation (1) is derived by the inventors' experiment, and by calculating the Ta equivalent, the force of how much the transformation temperature changes is derived ( The guessing power is S.
  • compositions of alloys 1 to 3 which are examples of the present invention of binary alloys of Ti and Ta, and alloys 4 to 12 of the examples of the present invention in which other additive elements are added to Ti and Ta , 8 of the first cycle of each alloy 1 to alloy 12 (.0, 8 of the second cycle (.0, transformation strain E (%), recovery strain e (%), and shape recovery rate A / f ) (% ) Measurement results and Ta equivalent (mol%) 3 ⁇ 4
  • ⁇ group in the present specification
  • ⁇ group an interstitial element that has the effect of suppressing precipitation of ⁇ phase, improving thermal stability and shape recovery, and suppressing plastic deformation by solid solution hardening.
  • Table 3 shows the measurement results of the shape recovery rate (%) and Ta equivalent (mol%) at the cycle.
  • Nb niobium
  • C group a V-phase stabilizing element that stabilizes the 0 phase, which is the parent phase of the Ti alloy, and is an element of the same family as Ta (referred to as “C group” in this specification).
  • Mo mobdenum
  • Cr chromium
  • group D transition metal element
  • Ti—Ta ternary alloy with Fe (iron), M n (manganese), Co (cobalt), and Ni (nickel) added Ti—Ta ternary alloy with Fe (iron), M n (manganese), Co (cobalt), and Ni (nickel) added, composition of alloy 10, alloy 21 to alloy 26, and one cycle of each alloy
  • Table 5 shows the measurement results of the eye shape recovery rate (%), the 2nd eye shape recovery rate (%), and the Ta equivalent (mol%).
  • Alloy 12 and Alloy 27 to Alloy 30 which are Ti-Ta-based ternary alloys to which Zr (zirconium) and Sn (tin) as additive elements are added, and the shape recovery rate of each alloy in the first cycle ( %), The measurement results of shape recovery rate (%) and Ta equivalent (mol%) in the second cycle are shown in Table 6.
  • Zr has the effect of increasing the transformation strain ⁇ (see Table 1), and Sn is caused by solid solution hardening.
  • compositions of alloys 31 to 35 which are Ti-Ta multi-element (quaternary) alloys to which the ⁇ -phase stabilizing element, interstitial element, and 0-phase stabilizing element are added, and the shape of each alloy in the first cycle
  • Table 7 shows the measurement results of the recovery rate (%), the shape recovery rate (%) of the second cycle and the Ta equivalent (mol%).
  • Alloy 36 is a Ti—22Nb binary alloy
  • Alloy 38 and Alloy 39 are alloys with a Ta equivalent of 30 mol% or less, and Alloy 40 is a Ti—40Ta binary alloy.
  • the Ti Ta binary alloys (Alloy 1 to Alloy 3) with Ta of 30 mol% and 36 mol% showed a transformation temperature of 100 ° C. or higher and a high shape recovery rate was confirmed.
  • Te the month, a thermal cycle under a high temperature (e.g. 50 ° C (323 K) or higher) it forces S component force can be force s use Shi repeatedly as the shape memory alloy ⁇ ivy.
  • the Ta group element Mo, Fe, Mn, Co, Cr, Ni
  • the Ta equivalent is 30 mol% or more.
  • Alloy 10 and Alloy 21 the recovery rate tends to decrease when the elements of Group D increase, cold workability deteriorates, and the transformation temperature also tends to decrease.
  • the total amount of the elements of Group D exceeds 2 mol%, it becomes difficult to produce a test piece by cold rolling of 80% or more. Therefore, it is desirable that the total amount of elements in Group D be 2 mol% or less! /.
  • FIG. 2 is an explanatory diagram of the experimental results of the Ti Ta binary alloy of the present invention material example.
  • FIG. 2A shows the relationship between the mole fraction of Ta and the transformation start temperature (Ms) under 5 OMPa.
  • FIG. 2B is an explanatory diagram of strain temperature curves of Ti—32Ta and Ti—40Ta.
  • FIG. 3 is an explanatory diagram of a strain temperature curve of the Ti 27Ta binary alloy of the material example of the present invention.
  • the transformation temperature will be 50 ° C or less, and shape recovery will not be possible under a high temperature (50 ° C or more) thermal cycle.
  • Figure 2B also shows that the shape recovery rate tends to decrease.
  • FIG. 4 is an explanatory diagram of a strain temperature curve of a Ti 22Nb binary alloy as a comparative material example.
  • Ti 22Nb has the same transformation temperature as Ti 32Ta, but the shape memory characteristics are lost after the second cycle as shown in Fig. 4. It has been confirmed that it is thermally unstable simply by thermal expansion and contraction.
  • the tension is low in the low temperature and low load state, and the friction loss.
  • the piston ring with increased tension can be realized by transformation under high temperature and high load conditions of 80 ° C or higher.
  • FIG. 5 is a schematic cross-sectional view of an example of the piston ring of the present invention.
  • the piston ring 30 of the present invention shown in FIG. 5 is a piston ring composed of only one ring 30, and the one ring 30 is formed of the titanium tantalum-based shape memory alloy described above.
  • the piston ring 30 of the present invention is characterized by its material, and its shape and the like are not particularly limited.
  • the bore diameter is appropriately designed according to the size of the internal combustion engine in which the piston ring 30 is used, the shape of the piston, and the like.
  • the thickness is preferably about 0.7 to 3 mm, and the tension in the diameter expansion direction of the piston ring 30 at that time is particularly preferable. Is 0.;! To 25N at room temperature, and preferably 0.2 to 55N after reverse transformation (austenite transformation).
  • the thickness is particularly preferably about 0.7 to 4 mm.
  • the tension in the diameter expansion direction of the piston ring 30 at that time is As described above, it is preferably 0.;! To 25N at room temperature, and preferably 0.2 to 55N after reverse transformation (austenite transformation)! /.
  • the piston ring 30 according to the present invention is not limited to the substantially rectangular shape shown in the drawing, and the cross-sectional shape that may be subjected to conventionally known surface processing or the like is not limited to the illustrated rectangular shape. It is possible to take a shape.
  • FIG. 6 is a schematic sectional view showing another example of the piston ring of the present invention.
  • FIG. 6 (a) shows a piston ring 40 composed of a piston ring body 41 and a coil expander 42.
  • FIG. 6B is a schematic cross-sectional view of a piston ring 50 including a piston ring main body 51 and a plate expander 52.
  • FIG. 6 (c) to (e) are schematic cross-sectional views of the side rings 44, 61, 71 and the spacer rings 45, 62, 72 and the piston rings 43, 60, 70 composed of forces. It is.
  • the piston ring of the present invention 40, 43, 50, 60, 70 and so on (together with the piston ring body 41, 51, or the side lanes 44, 61, 71 and the expander) 42, 45, 52, 62, 72 and / or at least one of them is made of the shape memory alloy described above, and the piston rings 40, 43, 50, 60, 70 ⁇ of the present invention (
  • the special copper spanders 42, 45, 52, 62 and 72 are made of a shape memory alloy, compared to the piston ring bodies 41 and 51 and the side lanes 44, 61 and 71. 45, 52, 62, and 72 contribute to the tension of the entire piston ring.
  • the size, shape, etc. are not particularly limited. Is preferred.
  • the piston ring of the present invention can be used for an oil ring or a pressure ring.
  • the coil outer diameter was 1.4 mm, and a coil expander was manufactured so that the tension at the high temperature was the same as in the comparative example described later. (made of, C mass 0/0: 0. 5, Si : 0. 2, Mn: 0. 3, P: 0. 02, S: 0. 015, Cr: 10. 2, balance Fe, and unavoidable Fig. 6 (a)
  • the piston ring of Example 1 of the present invention was produced.
  • the piston ring of Example 2 was produced using the alloy 11 of the material of the present invention described above.
  • the piston ring of Example 3 was produced using the alloy 4 of the material of the present invention described above.
  • the piston ring of Example 4 was produced using the alloy 5 of the material of the present invention described above.
  • a Ti-Ni (Ti-50at% Ni material) shape memory alloy which is a conventionally known shape memory alloy, has a reverse transformation peak temperature of 58 ° C.
  • a coil expander having a temperature of 65 ° C. after completion of the state (end of austenite transformation) and combining this with the same piston ring main body as in Example 1 is shown in FIG. 6A.
  • the piston ring of Comparative Example 1 was prepared.
  • each piston ring was used as an oil ring, and the other first pressure ring and the second pressure ring were all conventionally known rings having the same specifications. Each was mounted on a ⁇ 88mm piston in an internal combustion engine, and the fuel consumption was measured in 10 ⁇ 15 mode. On the other hand, with the exception of using a conventional coil expander made of spring steel, all other conditions were prepared with the same piston rings (top ring, second ring) as in the examples and comparative examples, and the fuel consumption was measured in the same way. did.
  • the piston ring of the present invention uses the piston ring of Comparative Example 1, that is, a conventionally known shape memory alloy (Ni-Ti system)! It was found that the fuel efficiency was about 4-5 times.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

La présente invention concerne un segment de piston permettant une variation de tension entre des conditions de basse température et de faible charge et des conditions de haute température et de forte charge, d'où une minimisation de la perte de pression et une amélioration du rendement du carburant. Le segment de piston est formé d'un alliage de titane et tantale à mémoire de forme comprenant du tantale dans une proportion comprise entre 30 et 40 % en moles, le reste consistant en du titane et des impuretés inévitables.
PCT/JP2007/064902 2006-07-31 2007-07-30 Segment de piston Ceased WO2008016010A1 (fr)

Applications Claiming Priority (2)

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JP2006-208895 2006-07-31
JP2006208895A JP2008032183A (ja) 2006-07-31 2006-07-31 ピストンリング

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012105557A1 (fr) * 2011-01-31 2012-08-09 日本ピストンリング株式会社 Alliage de titane
US9995393B2 (en) 2013-08-01 2018-06-12 Mahle Metal Leve S/A Piston ring and method for manufacturing same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011117502A (ja) * 2009-12-02 2011-06-16 Hino Motors Ltd ピストンリング
JP2012215238A (ja) * 2011-03-31 2012-11-08 Nippon Piston Ring Co Ltd ガソリンエンジン用ピストンリングの組合せ
JP6010278B2 (ja) * 2011-03-31 2016-10-19 日本ピストンリング株式会社 ディーゼルエンジン用ピストンリングの組合せ
CN117881806A (zh) * 2021-09-03 2024-04-12 日本活塞环株式会社 钛合金以及钛合金的制造方法

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Publication number Priority date Publication date Assignee Title
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JP2004340075A (ja) * 2003-05-16 2004-12-02 Toyota Motor Corp オイルリング
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JP2006089825A (ja) * 2004-09-27 2006-04-06 Furukawa Techno Material Co Ltd 生体用超弾性チタン合金

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WO2012105557A1 (fr) * 2011-01-31 2012-08-09 日本ピストンリング株式会社 Alliage de titane
JP5855588B2 (ja) * 2011-01-31 2016-02-09 日本ピストンリング株式会社 チタン合金
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US9995393B2 (en) 2013-08-01 2018-06-12 Mahle Metal Leve S/A Piston ring and method for manufacturing same

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