WO2021124818A1 - トーショナルダンパ - Google Patents
トーショナルダンパ Download PDFInfo
- Publication number
- WO2021124818A1 WO2021124818A1 PCT/JP2020/043857 JP2020043857W WO2021124818A1 WO 2021124818 A1 WO2021124818 A1 WO 2021124818A1 JP 2020043857 W JP2020043857 W JP 2020043857W WO 2021124818 A1 WO2021124818 A1 WO 2021124818A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hub
- rubber
- rubber ring
- ring
- torsional damper
- Prior art date
Links
- 229920001971 elastomer Polymers 0.000 claims abstract description 88
- 238000000034 method Methods 0.000 claims abstract description 19
- 229920002943 EPDM rubber Polymers 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 230000005284 excitation Effects 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 31
- 230000020169 heat generation Effects 0.000 abstract description 9
- 229910001018 Cast iron Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004441 surface measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000006087 Silane Coupling Agent Substances 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 150000001993 dienes Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 239000010734 process oil Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 229920006027 ternary co-polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
- F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
- F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
- F16F15/124—Elastomeric springs
- F16F15/126—Elastomeric springs consisting of at least one annular element surrounding the axis of rotation
-
- 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
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/36—Pulleys
-
- 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
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/025—Elastomers
-
- 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
- F16H—GEARING
- F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
- F16H55/32—Friction members
- F16H55/36—Pulleys
- F16H2055/366—Pulleys with means providing resilience or vibration damping
Definitions
- the present invention relates to a torsional damper.
- the torsional damper (hereinafter, also referred to as TVD) has a function of reducing the torsional vibration of the crankshaft by the action of a rubber ring that is attached to the tip of the crankshaft and is fitted between the hub and the vibration ring (mass). It is a product to be equipped.
- the TVD may also have a function as a crank pulley that transmits power to auxiliary machinery (alternator, air conditioner, water pump) via a belt.
- Patent Document 1 is a torsional damper having a damper hub attached to a rotating shaft and rotating integrally with the rotating shaft, and an inertial ring attached to the damper hub via a rubber member.
- the member is made of a rubber composition containing EPDM as a main component, and the rubber member mounted between the damper hub and the inertial ring has a loss coefficient (tan ⁇ pi) of 0 when the surface temperature is 60 ⁇ 5 ° C.
- an object of the present invention is to provide a torsional damper having a structure in which the rubber ring is extremely unlikely to be damaged by heat generation.
- the present inventor paid attention to the structure of the torsional damper on the premise that heat generation is unavoidable as a result of applying thermal energy to the TVD. Then, the structure of the torsional damper, in which the temperature of the rubber ring does not easily rise even if heat is generated, has been studied diligently. As a result, it was found that the temperature of the rubber ring of the torsional damper having a specific structure does not easily rise, and the present invention was completed.
- the present invention is the following (i) to (iii).
- (I) A hub that is fixed to a rotating shaft and has an outer peripheral surface on the circumference centered on the rotating shaft.
- An annular vibrating ring having an inner peripheral surface having a diameter larger than that of the outer peripheral surface of the hub on the circumference centered on the rotation axis.
- a loss coefficient (loss coefficient when the surface temperature is 60 ⁇ 5 ° C., which exists in a compressed state between the outer peripheral surface of the hub and the inner peripheral surface of the vibrating ring and is composed of a rubber composition containing EPDM as a main component.
- a rubber ring with a tan ⁇ ) of 0.18 or more With When subjected to the resonance point tracking method, the maximum temperature at which the rubber ring reaches the surface (Tmax) and the rubber fitting width (b) at the time of continuous excitation at the resonance point are determined. Equation (1): Tmax ⁇ -2.6b + 173.5 Equation (2): 20 ⁇ b A torsional damper that meets the requirements. (Ii) When subjected to the resonance point tracking method, the maximum temperature at which the rubber ring reaches the surface (Tmax) and the rubber fitting width (b) at the time of continuous excitation at the resonance point are determined.
- Equation (3) Tmax ⁇ -2.6b + 124 The torsional damper according to (i) above, which satisfies the above conditions.
- Equation (2) is the equation (2'): 20 ⁇ b ⁇ 100 The torsional damper according to (i) or (ii) above, which satisfies the above conditions.
- FIG. 1 It is the schematic perspective view which illustrated the embodiment of the torsional damper of this invention. It is a schematic cross-sectional perspective view of the torsional damper shown in FIG. It is a schematic cross-sectional perspective view for demonstrating the manufacturing method of the torsional damper shown in FIG. It is the schematic cross-sectional perspective view of the torsional damper used for the resonance point tracking method. It is a graph which shows the example of the surface temperature of a rubber ring when the resonance point tracking method is performed. It is a graph which shows the relationship between the fitting width (mm) and the maximum temperature (Tmax) which reaches the surface of a rubber ring.
- the present invention has a hub that is fixed to a rotating shaft and has an outer peripheral surface on the circumference centered on the rotating shaft, and a diameter larger than the outer peripheral surface of the hub on the circumference centered on the rotating shaft.
- An annular vibrating ring having an inner peripheral surface and a rubber composition existing in a compressed state between the outer peripheral surface of the hub and the inner peripheral surface of the vibrating ring and containing EPDM as a main component, and having a surface temperature.
- a rubber ring having a loss coefficient (tan ⁇ ) of 0.18 or more when the temperature is 60 ⁇ 5 ° C.
- a torsional damper in which the maximum surface reaching temperature (Tmax) and the rubber fitting width (b) satisfy the formula (1): Tmax ⁇ -2.6b + 173.5 and the formula (2): 20 ⁇ b.
- Tmax maximum surface reaching temperature
- b rubber fitting width
- FIG. 1 is a schematic perspective view illustrating an embodiment of the torsional damper of the present invention
- FIG. 2 is a schematic cross-sectional perspective view of the torsional damper shown in FIG.
- the torsional damper 1 of the embodiment illustrated in FIGS. 1 and 2 can be used by being attached to the tip of the crankshaft of an engine of a vehicle or the like.
- the torsional damper 1 has a function of absorbing the torsional resonance of the crankshaft and suppressing engine vibration and noise. Further, it may also serve as a drive pulley (crank pulley) that transmits power to the auxiliary equipment via a belt for the rotation of the crankshaft.
- the torsional damper 1 has a hub 3, a vibrating ring 5, and a rubber ring 7.
- the hub 3 includes a boss portion 31, a stay portion 33, and a rim portion 35.
- the boss portion 31 is provided at the central portion in the radial direction of the hub 3.
- the boss portion 31 is fixed to the tip of the crankshaft (rotating shaft), and the hub 3 is rotationally driven around the rotating shaft X.
- the stay portion 33 extends radially from the boss portion 31.
- the rim portion 35 is provided on the outer peripheral side of the stay portion 33.
- the rim portion 35 has a cylindrical shape, and a vibrating ring 5 is connected to the outer peripheral side of the rim portion 35 via a rubber ring 7.
- the outer peripheral surface of the rim portion 35 exists on the circumference centered on the rotation axis X.
- each of the boss portion 31, the stay portion 33, and the rim portion 35 can be formed by using a metal material such as cast iron as a raw material. Further, each of the boss portion 31, the stay portion 33, and the rim portion 35 is preferably made of flake graphite cast iron, spheroidal graphite cast iron, hot-rolled steel sheet for automobile structure, or the like. Examples of flake graphite cast iron include FC100, FC150, FC200, FC250, FC300, FC350 and the like.
- Examples of spheroidal graphite cast iron are FCD350-22, FCD350-22L, FCD400-18, FCD400-18L, FCD400-15, FCD450-10, FCD500-7, FCD600-3, FCD700-2, FCD800-2, FCD400- 18A, FCD400-18AL, FCD400-15A, FCD500-7A, FCD600-3A, etc. can be mentioned.
- Examples of rolled steel sheets for automobile structures include SAPH310, SAPH370, SAPH410, SAPH440 and the like.
- the vibrating ring 5 is arranged on the outer side in the radial direction of the hub 3.
- the inner peripheral surface of the vibrating ring 5 has a larger diameter than the outer peripheral surface of the hub 3. This inner peripheral surface exists on the circumference centered on the crankshaft (rotating shaft X).
- a pulley groove 51 on which a belt is hung is provided on the outer peripheral surface of the vibrating ring 5.
- the pulley groove 51 functions as a pulley for power transmission.
- the vibrating ring 5 can be formed by using a metal material such as cast iron as a raw material. Further, the vibrating ring 5 is preferably made of flake graphite cast iron. This is because flake graphite cast iron has an excellent ability to absorb vibrations and also has excellent wear resistance. Examples of flake graphite cast iron include FC100, FC150, FC200, FC250, FC300, FC350 and the like.
- the rubber ring 7 is inserted in the gap between the outer peripheral surface of the hub 3 and the inner peripheral surface of the vibrating ring 5.
- the rubber ring 7 plays a role of reducing torsional vibration of the crankshaft generated during traveling of a vehicle or the like to prevent damage, and reducing noise and vibration of engine vibration.
- the rubber ring 7 is made by vulcanizing a rubber composition containing ethylene / propylene / diene ternary copolymer (EPDM) as a main component, preferably carbon black or process oil, into a cylindrical shape or the like by, for example, a conventionally known method. Can be obtained by doing.
- the rubber composition preferably contains EPDM in an amount of 10 to 60% by mass or more, more preferably 15 to 55% by mass, more preferably 20 to 50% by mass, and further containing 30 to 50% by mass. preferable.
- the amount of carbon black is preferably 40 to 130 parts by mass, more preferably 50 to 100 parts by mass, and further preferably 60 to 80 parts by mass with respect to 100 parts by mass of EPDM.
- the rubber composition may contain zinc oxide, stearic acid, an antiaging agent, a peroxide, a cross-linking agent and the like.
- the rubber ring 7 has a loss coefficient (tan ⁇ ) of 0.18 or more, preferably 0.18 to 0.40, and 0.19 to 0.35 when the surface temperature is 60 ⁇ 5 ° C. More preferably, it is more preferably 0.20 to 0.28.
- the loss coefficient (tan ⁇ ) when the surface temperature is 60 ⁇ 5 ° C. means a value obtained by measuring by a resonance point tracking method (natural frequency measurement) by a high-frequency vibration tester.
- the measurement by the resonance point tracking method shall be performed under the following conditions.
- the method for producing such a torsional damper of the present invention is not particularly limited.
- it can be manufactured by the following method.
- a hub 30 and a vibrating ring 50 as shown in FIG. 3 are prepared, and a torque improving liquid is applied thereto by means such as spraying.
- a torque improving liquid a solution in which a silane coupling agent is mainly dissolved in a hydrocarbon solution (solvent) such as toluene or xylene can be used.
- the torque improving liquid is preferably applied to the portion of the hub 30 and the vibrating ring 50 that comes into contact with the rubber ring 70, that is, the inner peripheral surface of the vibrating ring 50 and the outer peripheral surface of the rim portion of the hub 30.
- a rubber ring coated with the fitting liquid is press-fitted into the gap (gap portion 80) between the hub 30 and the vibrating ring 50 by using a press-fitting jig such as a press machine.
- the width of the gap in the gap 80 is narrower than the thickness of the rubber ring 70.
- the thickness of the rubber ring 70 / the width of the gap of the gap 80 is preferably about 0.6 to 0.9.
- the rubber ring exists in a compressed state between the outer peripheral surface of the hub and the inner peripheral surface of the vibrating ring.
- the present inventor has various structures with different wall thickness (a), fitting width (b), rubber thickness (c), fitting diameter (d), and hub fitting portion wall thickness (e).
- a damper was prepared and the effect on the temperature of the rubber ring was examined.
- the vibrating ring wall thickness (a) means the thickness of the vibrating ring 5 in the radial direction (direction perpendicular to the rotation axis X) as shown in FIG.
- the radial thickness of the vibrating ring 5 is measured at 10 randomly selected points. , The value obtained by averaging them is defined as the vibrating ring wall thickness (a).
- the fitting width (b) means the length of the rim portion 35 of the hub 3 in the rotation axis X direction.
- the fitting width (b) is not constant in the rotation axis X direction, the length of the longest portion of the rim portion 35 of the hub 3 in the rotation axis X direction is defined as the fitting width (b).
- the rubber thickness (c) means the thickness of the rubber ring 7 in the radial direction (direction perpendicular to the rotation axis X) as shown in FIG.
- the rubber thickness (c) is not constant in the radial direction of the rubber ring 7 as shown in FIG. 2, the thickness of the rubber ring 7 in the radial direction is measured at 10 randomly selected points, and these are measured. Let the value obtained by averaging the rubber thickness (c).
- the fitting diameter (d) means the diameter of the outer peripheral surface of the rim portion 35 in the hub 3. Further, the fitting diameter (d) means the shortest diameter among the diameters (outer diameters) of the outer peripheral surface of the rim portion 35. Therefore, as in the embodiment shown in FIG. 2, when the rim portion 35 is meandering with respect to the rotation axis X direction, the point closest to the rotation axis X on the outer peripheral surface thereof (in the case of FIG. 2, the rotation axis X). It shall mean the diameter at the center point in the direction).
- the hub fitting portion wall thickness (e) means the thickness of the rim portion 35 in the hub 3 in the radial direction (direction perpendicular to the rotation axis X).
- the hub fitting portion wall thickness (e) means a thickness other than the portion of the rim portion 35 that is connected to the stay portion 33.
- 10 is randomly selected in the direction perpendicular to the rotation axis X. At points, the thickness of the rim portion 35 in the radial direction (excluding the portion connected to the stay portion 33) is measured, and the value obtained by averaging them is taken as the hub fitting portion wall thickness (e).
- the present inventor has the embodiment shown in FIG. 4, in which the vibration ring wall thickness (a), the fitting width (b), the rubber thickness (c), the fitting diameter (d), and the hub fitting portion wall thickness (d).
- Tortional dampers having various structures with different e) were prepared, and each torsional damper was subjected to the above-mentioned resonance point tracking method, and the maximum surface temperature (Tmax) of the rubber ring at that time was measured.
- the maximum temperature (Tmax) reached on the surface of the rubber ring by the resonance point tracking method shall be measured under the following conditions.
- Vibration amplitude ⁇ 0.05 deg -Phase at vibration: -90 deg ⁇ Test time: Until the surface temperature of the rubber ring saturates ⁇ Atmospheric temperature: 23 ⁇ 3 °C -Rubber surface measurement method: Non-contact type surface thermometer
- the surface temperature of the rubber ring of the torsional damper was measured using a non-contact surface thermometer.
- An example of the measurement result is shown in FIG.
- the surface temperature of the rubber ring (vertical axis in FIG. 5) gradually rises from the start of the test and saturates after about 30 minutes have passed.
- the surface temperature of the rubber ring at the time of saturation was defined as the maximum temperature reached by the surface of the rubber ring (Tmax) in the torsional damper having the structure.
- the present inventor has different vibration ring wall thickness (a), fitting width (b), rubber thickness (c), fitting diameter (d), and hub fitting portion wall thickness (e).
- the torsional dampers having various structures were subjected to the resonance point tracking method, and the maximum temperature (Tmax) reached on the surface of the rubber ring at that time was measured. Then, it was found that the maximum temperature (Tmax) reached on the surface of the rubber ring strongly depends on the fitting width (b), and the temperature of the rubber ring does not rise in the region shown in FIG.
- the area can be expressed by an equation as follows. Equation (1): Tmax ⁇ -2.6b + 173.5 Equation (2): 20 ⁇ b
- the plot in FIG. 6 is data showing the relationship between the fitting width (b, unit is mm) actually measured by the above resonance point tracking method and the maximum temperature reached on the surface of the rubber ring (Tmax, unit is ° C.). Is.
- the data is shown in Table 1.
- the maximum surface temperature (Tmax) of the rubber ring is lower than 120 ° C.
- the rubber ring used in the present invention is a rubber ring composed of a rubber composition containing EPDM as a main component and having a loss coefficient (tan ⁇ ) of 0.18 or more when the surface temperature is 60 ⁇ 5 ° C. Such a rubber ring is not easily damaged when the maximum surface temperature (Tmax) is 120 ° C. or lower.
- the torsional damper of the present invention preferably satisfies the formula (3).
- the fitting width (b) is 20 mm or more as compared with the formula (2), but more preferably 25 mm or more.
- the fitting width (b) is preferably 100 mm or less, more preferably 80 mm or less, more preferably 60 mm or less, more preferably 40 mm or less, and more preferably 35 mm or less. More preferred.
- the rubber ring is extremely unlikely to be damaged due to heat generation.
- a proposal for example, the torsional damper described in Patent Document 1 to suppress heat generation of a rubber ring by adjusting the material of the rubber ring.
- the heat generation of the rubber ring is suppressed by adjusting the structure of the torsional damper, specifically, the length (fitting width) of the vibrating ring in the rotation axis X direction.
- the idea did not exist. It can be said that the present invention is not an invention that can be easily conceived by those skilled in the art in that the technical idea is shown and the region where the heat generation of the rubber ring can be suppressed is shown by a concrete mathematical formula. ..
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Abstract
Description
また、TVDはベルトを介して補機類(オルタネーター、エアコン、ウォーターポンプ)へ動力を伝達するクランクプーリーとしての機能も備える場合がある。
特許文献1には、回転軸に取り付けられ、前記回転軸と一体的に回転するダンパハブと、前記ダンパハブにゴム部材を介して装着された慣性リングと、を有するトーショナルダンパであって、前記ゴム部材は、EPDMを主成分とするゴム組成物からなり、前記ダンパハブと前記慣性リングとの間に装着された前記ゴム部材は、表面温度が60±5℃の時の損失係数(tanδpi)が0.27以上であり、前記トーショナルダンパの共振点での連続加振時における前記ゴム部材の表面最高到達温度(Tmax)は、以下の式 Tmax=α×ln(tanδpi)+β≦100(式中、αは-46.9~-60.4の範囲の係数を表し、βは+9.4~+27.7の範囲の係数を表す)を満たす、トーショナルダンパが記載されている。そして、このようなトーショナルダンパは、ダンパハブと慣性リングとの間に装着されるゴム部材の温度上昇を抑制することができるので、耐久性の向上したトーショナルダンパを提供することができると記載されている。
その結果、特定の構造を備えるトーショナルダンパは、ゴムリングの温度が上昇し難いことを見出し、本発明を完成させた。
(i)回転軸に固定され、前記回転軸を中心とする円周上に外周面を有するハブと、
前記回転軸を中心する円周上に、前記ハブの前記外周面よりも径が大きい内周面を有する環状の振動リングと、
前記ハブの前記外周面と前記振動リングの前記内周面との間に圧縮状態で存在し、EPDMを主成分とするゴム組成物からなり、表面温度が60±5℃のときの損失係数(tanδ)が0.18以上であるゴムリングと、
を備え、
共振点追跡法に供した場合に、共振点での連続加振時における前記ゴムリングの表面到達最高温度(Tmax)と、ゴム嵌合幅(b)とが、
式(1) : Tmax≦-2.6b+173.5
式(2) : 20≦b
を満たす、トーショナルダンパ。
(ii)共振点追跡法に供した場合に、共振点での連続加振時における前記ゴムリングの表面到達最高温度(Tmax)と、ゴム嵌合幅(b)とが、
さらに、
式(3) : Tmax≧-2.6b+124
を満たす、上記(i)に記載のトーショナルダンパ。
(iii)前記式(2)が
式(2´) : 20≦b≦100
を満たす、上記(i)または(ii)に記載のトーショナルダンパ。
本発明について説明する。
本発明は、回転軸に固定され、前記回転軸を中心とする円周上に外周面を有するハブと、前記回転軸を中心する円周上に、前記ハブの前記外周面よりも径が大きい内周面を有する環状の振動リングと、前記ハブの前記外周面と前記振動リングの前記内周面との間に圧縮状態で存在し、EPDMを主成分とするゴム組成物からなり、表面温度が60±5℃のときの損失係数(tanδ)が0.18以上であるゴムリングと、を備え、共振点追跡法に供した場合に、共振点での連続加振時における前記ゴムリングの表面到達最高温度(Tmax)と、ゴム嵌合幅(b)とが、式(1):Tmax≦-2.6b+173.5、式(2):20≦bを満たす、トーショナルダンパである。
このようなトーショナルダンパを、以下では「本発明のトーショナルダンパ」ともいう。
図1は、本発明のトーショナルダンパの実施態様を例示した概略斜視図であり、図2は図1に示したトーショナルダンパの概略断面斜視図である。
ボス部31は、ハブ3における径方向の中央部に設けられている。ボス部31がクランクシャフト(回転軸)の先端に固定され、ハブ3が回転軸Xを中心に回転駆動する。
ステー部33は、ボス部31から径方向に伸びている。
リム部35は、ステー部33の外周側に設けられている。リム部35は円筒状であり、リム部35の外周側にゴムリング7を介して振動リング5が連結される。
リム部35の外周面は、回転軸Xを中心とする円周上に存在している。
また、ボス部31、ステー部33およびリム部35の各々は、特に、片状黒鉛鋳鉄、球状黒鉛鋳鉄、自動車構造用熱間圧延鋼板等からなることが好ましい。片状黒鉛鋳鉄の例としては、FC100、FC150、FC200、FC250、FC300、FC350等を挙げることができる。球状黒鉛鋳鉄の例としては、FCD350-22、FCD350-22L、FCD400-18、FCD400-18L、FCD400-15、FCD450-10、FCD500-7、FCD600-3、FCD700-2、FCD800-2、FCD400-18A、FCD400-18AL、FCD400-15A、FCD500-7A、FCD600-3A等を挙げることができる。自動車構造用圧延鋼板の例としては、SAPH310、SAPH370、SAPH410、SAPH440等を挙げることができる。
また、振動リング5の外周面にベルトが掛かるプーリ溝51が設けられている。プーリ溝51は動力伝達用のプーリとして機能する。
また、振動リング5は片状黒鉛鋳鉄からなることが好ましい。片状黒鉛鋳鉄は振動を吸収する能力が優れており、耐摩耗性にも優れているためである。片状黒鉛鋳鉄の例としては、FC100、FC150、FC200、FC250、FC300、FC350等を挙げることができる。
ゴム組成物は配合量としてEPDMを10~60質量以上含むことが好ましく、15~55質量%含むことがより好ましく、20~50質量%含むことがより好ましく、30~50質量%含むことがさらに好ましい。
また、EPDM100質量部に対してカーボンブラックが40~130質量部であることが好ましく、50~100質量部であることがより好ましく、60~80質量部であることがさらに好ましい。
ここでゴム組成物は、亜鉛華、ステアリン酸、老化防止剤、過酸化物、架橋剤等を含んでもよい。
・加振振幅:±0.05deg
・加振時位相:-90deg
・雰囲気温度:23±3℃
・ゴム表面測定方法:非接触式表面温度計
このような本発明のトーショナルダンパを製造する方法は特に限定されない。
例えば次のような方法によって製造することができる。
初めに、図3に示すようなハブ30および振動リング50を用意し、ここへスプレー等の手段によってトルク向上液を塗布する。トルク向上液として、主としてシランカップリング剤をトルエン、キシレン等の炭化水素溶液(溶媒)に溶解させた溶液を用いることができる。トルク向上液はハブ30および振動リング50におけるゴムリング70と接触する部位、すなわち、振動リング50における内周面と、ハブ30のリム部の外周面に塗布することが好ましい。
そして、図3に示すように、ハブ30と振動リング50との隙間(間隙部80)へ、嵌合液を塗布したゴムリングを、プレス機等の圧入治具等を用いて圧入する。ここでゴムリング70の厚さよりも、間隙部80の隙間の幅の方が狭いことが好ましい。具体的にはゴムリング70の厚さ/隙間部80の隙間の幅が0.6~0.9程度であることが好ましい。
本発明のトーショナルダンパにおいてゴムリングは、ハブの外周面と振動リングの内周面との間に圧縮状態で存在する。
本発明者は、振動リング肉厚(a)、嵌合幅(b)、ゴム厚(c)、嵌合径(d)、ハブ嵌合部肉厚(e)が異なる様々な構造のトーショナルダンパを用意し、ゴムリングの温度への影響を検討した。
・加振振幅:±0.05deg
・加振時位相:-90deg
・試験時間:ゴムリングの表面温度がサチレートするまで
・雰囲気温度:23±3℃
・ゴム表面測定方法:非接触式表面温度計
測定結果の例を図5に示す。
図5に示すように、ゴムリングの表面温度(図5の縦軸)は試験開始から徐々に上昇し、30分程度が経過するとサチレートする。
サチレートしたときのゴムリングの表面温度を、その構造のトーショナルダンパにおけるゴムリングの表面到達最高温度(Tmax)とした。
そして、ゴムリングの表面到達最高温度(Tmax)は、嵌合幅(b)に強く依存し、図6に示す領域において、ゴムリングの温度が上昇しないことを見出した。
その領域を式で表すと、以下の通りとなる。
式(1) : Tmax≦-2.6b+173.5
式(2) : 20≦b
また、嵌合幅(b)は100mm以下であることが好ましく、80mm以下であることがより好ましく、60mm以下であることがより好ましく、40mm以下であることがより好ましく、35mm以下であることがさらに好ましい。
従来、ゴムリングの材質を調整することでゴムリングの発熱を抑制する提案(例えば特許文献1に記載のトーショナルダンパ)は存在した。
しかし、本発明のように、トーショナルダンパの構造、具体的には、振動リングにおける回転軸X方向における長さ(嵌合幅)を調整することで、ゴムリングの発熱を抑制するという技術的思想は存在していなかった。
本発明は、当該技術的思想を示したうえで、さらにゴムリングの発熱を抑制することができる領域を具体的な数式で示したこと等において、当業者が容易に想到できる発明ではないと言える。
3、30 ハブ
31 ボス部
33 ステー部
35 リム部
5、50 振動リング
51 プーリ溝
7、70 ゴムリング
X 回転軸
Claims (3)
- 回転軸に固定され、前記回転軸を中心とする円周上に外周面を有するハブと、
前記回転軸を中心する円周上に、前記ハブの前記外周面よりも径が大きい内周面を有する環状の振動リングと、
前記ハブの前記外周面と前記振動リングの前記内周面との間に圧縮状態で存在し、EPDMを主成分とするゴム組成物からなり、表面温度が60±5℃のときの損失係数(tanδ)が0.18以上であるゴムリングと、
を備え、
共振点追跡法に供した場合に、共振点での連続加振時における前記ゴムリングの表面到達最高温度(Tmax)と、ゴム嵌合幅(b)とが、
式(1) : Tmax≦-2.6b+173.5
式(2) : 20≦b
を満たす、トーショナルダンパ。 - 共振点追跡法に供した場合に、共振点での連続加振時における前記ゴムリングの表面到達最高温度(Tmax)と、ゴム嵌合幅(b)とが、
さらに、
式(3) : Tmax≧-2.6b+124
を満たす、請求項1に記載のトーショナルダンパ。 - 前記式(2)が
式(2´) : 20≦b≦100
を満たす、請求項1または2に記載のトーショナルダンパ。
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KR1020227016063A KR20220075429A (ko) | 2019-12-20 | 2020-11-25 | 토셔널 댐퍼 |
CN202080073439.0A CN114599896A (zh) | 2019-12-20 | 2020-11-25 | 扭转减振器 |
US17/779,609 US20230003278A1 (en) | 2019-12-20 | 2020-11-25 | Torsional damper |
EP20902888.5A EP4080083A4 (en) | 2019-12-20 | 2020-11-25 | TORSION DAMPER |
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