WO2005068864A1 - 樹脂製ジョイントブーツ - Google Patents
樹脂製ジョイントブーツ Download PDFInfo
- Publication number
- WO2005068864A1 WO2005068864A1 PCT/JP2004/000378 JP2004000378W WO2005068864A1 WO 2005068864 A1 WO2005068864 A1 WO 2005068864A1 JP 2004000378 W JP2004000378 W JP 2004000378W WO 2005068864 A1 WO2005068864 A1 WO 2005068864A1
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- WO
- WIPO (PCT)
- Prior art keywords
- oil
- resin
- joint boot
- mineral oil
- oils
- Prior art date
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
- F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
- F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the cover
Definitions
- the present invention relates to a bellows-shaped resin joint boot used for a constant velocity joint of an automobile.
- This type of resin joint block has a large-diameter part fitted on the outer periphery of the housing part on one shaft side of a constant-velocity joint of an automobile, and a small-diameter part fitted on the outer periphery of the other shaft.
- the mouth is connected to the tapered J] bellows of the dog to prevent the grease sealed in the constant velocity joint from leaking and to prevent the entry of dust.
- chloroprene rubber has been the mainstream as a molding material for such joints, but recently, because of its excellent heat resistance, bending resistance, and strength, it has been known to use high elasticity thermoplastic polyester elastomers and the like. Plastic elastomer resins have been used.
- joint boots made of such a thermoplastic elastomer resin also have disadvantages. That is, when a joint boot made of a highly elastic thermoplastic elastomer resin is attached to a constant velocity joint of an automobile and rotated while being bent at a wide angle, the peaks of the bellows rub against each other. Abnormal noise is generated by the rubbing action, and the material is worn down due to the abnormal noise. In particular, when the outer surface of the joint boots is slightly covered with moisture, such abnormal noise is liable to occur remarkably.
- Japanese Patent Application Publication No. JP-A-2003-22-568 proposes to add a mineral oil or a vegetable oil to a thermoplastic elastomer resin.
- a mineral oil or vegetable oil By adding mineral oil or vegetable oil to the thermoplastic elastomer resin in this way, oil gradually precipitates on the surface of the joint boot, and the precipitated oil causes frictional resistance when the bellows rub against each other. Is reduced to suppress the generation of abnormal noise be able to.
- the deposited liquid adheres to the surface of the joint boot in the form of an oil film, unlike a solid powder-like precipitate such as fatty acid amide, it is not easily rubbed off the surface of the joint boot, and the generation of abnormal noise is suppressed. The duration can be extended.
- the present invention has been made in view of the above, and it is an object of the present invention to provide a resin joint boot capable of stably exhibiting an abnormal noise generation suppressing effect over a long period of time while preventing initial noise generation. Aim.
- a resin joint boot according to the first invention of the present invention is formed from a resin composition containing a thermoplastic elastomer resin and a plurality of oils having different kinematic viscosities.
- a resin composition containing a thermoplastic elastomer resin and a plurality of oils having different kinematic viscosities.
- the oils having a low kinematic viscosity tend to precipitate relatively early on the joint boot surface.
- oil with a high kinematic viscosity precipitates relatively slowly, so that the effect of suppressing abnormal noise generation can be stably exhibited over a long period of time while securing the effect of suppressing initial noise generation.
- the amount of such oil deposited has a temperature dependence. That is, as shown by the dotted line Y in FIG. 2, the amount of precipitated oil is reduced at a certain temperature zone as a peak and before and after the peak. This peak temperature depends on the kinematic viscosity of the oil, and a single oil cannot eliminate such temperature dependence.
- the temperature dependence of the amount of precipitated oil can be reduced as shown by a solid line X in FIG. Oil can be deposited stably at ambient temperature.
- a resin joint boot according to a second invention of the present invention is a resin joint boot molded from a resin composition containing a thermoplastic elastomer resin,
- the resin composition is a mineral oil having a paraffin content of less than 60% and a naphthene content of 35% or more (ie, a naphthenic oil), and a paraffin content of 6% or more and a naphthene content of 35%
- a mineral oil ie, a paraffinic oil
- Mineral oil a naphthenic oil with a high content of naphthenic components
- mineral oil a paraffinic oil with a high content of paraffin components
- the time required for precipitation on the surface of the joint boots varies.
- FIG. 1 is a longitudinal sectional view illustrating the shape of a resin joint boot.
- Figure 2 is a graph showing the relationship between the amount of oil deposited on the surface of the joint boot and the ambient temperature.
- FIG. 1 is a sectional view (longitudinal side view) of a resin joint boot 1 according to one embodiment of the present invention.
- the joint boot 1 has a large-diameter portion 2 at one end and a small-diameter portion 3 at the other end, and is connected between the large-diameter portion 2 and the small-diameter portion 3 by a tapered bellows portion 4.
- It is a flexible boot made of resin that is integrally molded by a known molding method such as injection molding, press blow molding, injection blow molding, or direct blow molding.
- the resin joint boot “1" formed in this manner is, for example, connected to an outer case (housing section) 5 of an inboard joint (universal joint) for linking a drive shaft to a rear axle of an automobile so as to bend and displace.
- the large diameter part 2 is externally fitted and tightened and fixed by the tightening clamp 6, and the small diameter part 3 is externally fitted to the rear axle 7 and tightened and fixed by the tightening clamp 8, thereby joining
- a grease-filled space 9 is formed inside each bellows portion 4 when covering the outside of the bird.
- a resin composition for molding the resinous joint boot 1 having the above configuration a resin obtained by mixing a plurality of oils having different kinematic viscosities with a thermoplastic elastomer resin as a base resin material is used.
- thermoplastic elastomer resin TPE
- polyester TPEE
- polyolefin TPO
- polyamide ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
- Any of these can be used, such as ⁇ ⁇ ) and urethane (TPU), but polyester is preferred ( ⁇ ⁇ ⁇ ⁇ ).
- thermoplastic polyester elastomer is composed of a hard segment composed of an aromatic dicarbonic acid and a low molecular weight glycol and a soft segment having a molecular weight of 400 to 400 ⁇ 0, Excellent in bending resistance, strength, and in combination with mineral oil, etc., described later, while ensuring sealing performance and durability, especially excellent initial noise generation prevention effect, long-lasting noise generation suppression It is preferable because it has an effect.
- the polyester segment constituting the hard segment has a melting point of 180 ° C. or more when a high polymer is formed using only the hard segment, whereas the soft segment has a softening point or melting point of 8 °° C. It is preferably C or less.
- aromatic dicarboxylic acid constituting the hard segment examples include terephthalic acid, diphenyl carboxylic acid, 5-natridium sulfoisophthalic acid, and 2,6-naphthalenedicarboxylic acid, and 1,5.
- examples include naphthalenedicarboxylic acids such as naphthalenedicarboxylic acid and 1,4-naphthalenedicarboxylic acid, and it is particularly preferable to use at least one selected from terephthalic acid and naphthalenedicarboxylic acid. That's right.
- aliphatic (alicyclic) dicarboxylic acid increases the degree of freedom in adjusting the properties of TPEE, and is a preferred embodiment.
- the cyclic dicarboxylic acids include cyclohexanedicarponic acid, tetrahydrophthalic anhydride, succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid, dodecanoic acid, dimeric acid, and hydrogenated dimer acid.
- the content of the aromatic dicarboxylic acid is preferably at least 0 mol% in the total acidic content, more preferably 7 mol% or more. 5 mol% or more.
- the low molecular weight glycol constituting the hard segment include ethylene glycol, 1,3-propylene glycol, 1,4-heptanediol, 1,5-pentanediol, 1,6-hexanediol, , 9-nonanediol, neopentyl glycol, dimethylol heptane, dimethylol pentane, tricyclodecane dimethanol, bisphenol A ethylene oxide adduct, bisphenol F ethylene oxide adduct, bisphenol S ethylene Examples include oxide adducts, 1,4-cyclohexanedimethanol, dimer glycol, and the like. Among these, at least one selected from ethylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, and dimer glycol is particularly preferable.
- the aromatic dicarboxylic acid is terephthalic acid and the low molecular weight glycol is 1,4-butanediyl.
- the soft segment in the thermoplastic polyester elastomer include polyoxytetramethylene glycol (PTMG), polyoxypropylene glycol (PPG), and aliphatic polyester polyester. It is preferable that the terminal of the polyoxypropylene glycol be an ethylene oxide unit.
- Aliphatic polyester diols include aliphatic dicarboxylic acids such as adipic acid, azelaic acid, sebacic acid, dodecanoic acid, dimer acid, and hydrogenated dimer acid, and ethylene glycol, 1,3-propylene glycol, and 1,4-pta.
- Condensation polymers of glycols such as 1,2-pentanediol, 1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, neopentyl glycol, dimethylolheptane, and dimethylopentylpentane; ⁇ -force prolactone Ring-opened polymers, and copolymers obtained by adding ⁇ -force prolactone based on ⁇ TMG.
- the soft segment is preferably polyoxytetramethylene glycol, polyoxypropylene glycol, or poly ⁇ -force prolactone diol, and the soft segment is preferably polyoxytetramethylene glycol. preferable.
- the copolymerization amount of the polyoxytetramethylene glycol in the thermoplastic polyester elastomer is preferably 35 to 55% by weight. More preferably, the copolymerization amount of tramethylene glycol is 4% to 5% by weight.
- thermoplastic polyester elastomers using the above-mentioned components include Perprene (trade name, manufactured by Toyobo Co., Ltd.), Hytrel (trade name, manufactured by Toray Dupont Co., Ltd.), ARNITEL (manufactured by DSM) Are commercially available and their use is recommended.
- a thermoplastic polyester elastomer using a polymer of terephthalic acid and 1,4-butanediol as the hard segment and PTMG as the soft segment, wherein the copolymerization amount of PTMG is 40 to 50% by weight> For example, Perprene # 46D is exemplified as a suitable commercial product.
- thermoplastic elastomer resin As the plurality of oils having different kinematic viscosities to be added to the above-mentioned thermoplastic elastomer resin, it is preferable to use two or more kinds selected from various mineral oils and vegetable oils. Preferably, two or more kinds are selected from mineral oils.
- mineral oils contain paraffin components, naphthene components, and aromatic components, and are classified as paraffin-based process oils, naphthenic-based process oils, and aroma-based process oils according to their composition ratios.
- a paraffinic oil or a naphthic oil having an aromatic component content of 13% or less is used. Futen oils are preferably used.
- the content of paraffin, naphthene, and aromatic components in the process oil was measured by a ring analysis method ( ⁇ 1 d-M method). ) Line by the method according to.
- Suitable vegetable oils include rapeseed oil, linseed oil, soybean oil, castor oil, and the like.
- the difference between the kinematic viscosities of at least two kinds of oils blended in the thermoplastic elastomer resin is 50 mm 2 / s (25 ° C.) or more. That is, the difference between the kinematic viscosities of the two oils is preferably 50 mm 2 / s (25 ° C) or more, and the addition of three or more oils is The difference between the kinematic viscosities of the lowest viscosity oil and the highest viscosity oil is preferably 5 Omm 2 s (25 ° C) or more.
- kinematic viscosity 50 ⁇ 15_Rei_mm 2 Zs and (25 ° C) at a low to medium oil viscosity (A) kinematic viscosity 200 ⁇ 600mm 2 Zs (25 °
- B high-viscosity oil
- the oil (A) is a mineral oil (paraffin-based oil) having a paraffin content of 60% or more and a naphthene content of less than 35%, or a naphthene content of 35% or less. % Or more of the mineral oil (naphthenic oil), and the oil (B) is preferably a mineral oil (paraffinic oil) having a naphthenic component content of less than 35% with a paraffin component content of 60% or more.
- the oil (A) is a naphthenic oil and the oil (B) is a paraffinic oil
- the time required for the paraffinic oil and the naphthenic oil to precipitate on the surface of the joint boot differs depending on the component ratio. .
- the mineral oil (A) and the mineral oil (B) have different kinematic viscosities, but this is mainly due to the difference in the molecular weight. And the ambient temperature at which precipitation tends to occur is also different. Therefore, by utilizing the difference in the molecular weight (kinematic viscosity) and the difference in the component ratio of the mineral oil, the timing of precipitation on the surface of the joint boot can be effectively controlled.
- Such a plurality of oils are preferably blended in an amount of 5 parts by weight or less, more preferably 0.5 to 3 parts by weight, based on 100 parts by weight of the thermoplastic elastomer resin. It is to mix.
- the amount is more than 5 parts by weight, the duration of noise suppression can be prolonged.However, depending on the composition of TPEE used, cracks may be formed early in the valley of the bellows, and it may be necessary. + Sufficient durability may not be obtained.
- the above resin composition contains an antioxidant, a light stabilizer, an antistatic agent, a molecular regulator such as a peroxide, a metal deactivator, an organic or inorganic nucleating agent, a filler, a bulking agent, and a reinforcing agent. And various additives such as a coloring agent.
- an antioxidant known liquid or solid antioxidants such as hindered phenol-based, zeolite-based, and phosphorus-based antioxidants can be used.
- As the light stabilizer hindered amine-based and triazole-based antioxidants can be used.
- Known light stabilizers such as benzophenone, benzoate, nickel and salicyl can be used.
- filler As the filler, extender, reinforcing agent, and colorant, known ones can be used without limitation.
- carbon black, silica, calcium carbonate, kaolin, talc examples thereof include clay oxides, diatomaceous earth, wollastonite, etc., metal oxides such as calcium carbonate and barium carbonate, and organic or inorganic pigments.
- the method of preparing such a resin composition is not particularly limited, but the thermoplastic elastomer resin pellets are heated and a liquid additive such as the plurality of oils is added thereto. It is preferable that the additive is added and mixed and stirred, and the resulting mixture is kneaded and extruded using an extruder to prepare the mixture, whereby the oil can be uniformly dispersed in the thermoplastic elastomer resin. . Then, using the resin composition thus obtained as a molding material, the resin joint boot may be molded.
- thermoplastic elastomer resin a polymer of terephthalic acid and 1,4-butanediol is used as a hard segment, and PTMG is used as a soft segment.
- PTMG is used as a soft segment.
- a certain thermoplastic polyester elastomer, Perprene P46D (Toyobo Co., Ltd.) was used. After the temperature of the pellet of the thermoplastic polyester elastomer was reduced to about 60 ° C by stirring, the oil was added to 10 parts by weight of the resin as shown in Tables 2 and 3 below.
- the temperature dependence of the amount of precipitation and the persistence of the precipitation were examined as the precipitation characteristics of the oil, which is an abnormal noise generation suppressing material.
- the results are shown in Tables 2 and 3 below.
- the temperature dependence of precipitation is as follows: Immediately after molding each joint boot, leave it in an atmosphere of 10 ° C, 10 ° C, 23 ° C, 30 ° C, and 5 ° C for 2 weeks. Later, the inner and outer surfaces of the boot were wiped with a soft cloth (wess), and the weight change was measured to determine the amount of oil deposited on the boot surface. The amount of precipitation is indicated by weight (mg) per boot (55 g).
- the persistence of precipitation can be measured by leaving each joint boot at room temperature immediately after molding, wiping the inner and outer surfaces of the boot with a soft cloth once every two weeks, and measuring the change in weight. The amount of oil deposited on the surface was measured. The amount of precipitation was indicated by the above and the weight (mg) per solid-like boot.
- Example 1 PS-430 / PS-90 1.0 / 0.5phr 346 51 65 75 55 48
- Example 1 PS-430 / PS-90 1.0 / 0.5 phr 346 75 52 45 38
- Example 2 PS-430 / NS-1 ⁇ 0 Two 1.0Z0.5phr 335 60 46 41 3.8 Comparative Example 1 PS-90 / NS-100 Two 1.0 / 0.5phr 1 1 41 31 20 15 Comparative Example 2 PS-430 Two 1.5phr one 55 35 31 26 Comparative Example 3 PS- 90 2 1.5 phr ⁇ 65 28 13 8 Comparative Example 4 NS-100 1.5 phr 25 22 18 15
- Example 1 in which a plurality of minerals having different kinematic viscosities were used in combination, and in Example 2 in which kinematic viscosities were different and a paraffinic oil and a naphthenic oil were used in combination, the sustained was excellent.
- the initial precipitation amount was equal to or greater than that of Comparative Examples 1 to 4, but the high precipitation amount was secured to some extent even after a long period of time. The reason is that, although the amount of oil to be added was the same (1.5 phr), the amount of precipitation of I ⁇ tal was able to be increased. From the above, according to Examples 1 and 2, it can be seen that the noise generation suppressing effect can be stably exhibited over a long period of time while securing the initial noise generation suppressing effect.
- the resin joint boot of the present invention can be used for various kinds of joins such as a constant velocity joint of an automobile, and also suppresses the generation of abnormal noise at the time of continuous rotation while being bent at a wide angle. In addition, the effect of suppressing abnormal noise generation can be exhibited stably over a long period of time.
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Diaphragms And Bellows (AREA)
Abstract
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PCT/JP2004/000378 WO2005068864A1 (ja) | 2004-01-19 | 2004-01-19 | 樹脂製ジョイントブーツ |
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04220435A (ja) * | 1990-03-09 | 1992-08-11 | Union Carbide Chem & Plast Co Inc | 低密度ポリエチレンの押出方法 |
JPH07263071A (ja) * | 1994-03-28 | 1995-10-13 | Yazaki Corp | コネクタ防水用シール部品 |
JPH11199780A (ja) * | 1998-01-07 | 1999-07-27 | Toyo Tire & Rubber Co Ltd | 熱可塑性エラストマー樹脂製のフレキシブルジョイントブーツ |
JP2001523799A (ja) * | 1997-11-14 | 2001-11-27 | ジー・ケー・エヌ・オートモーティヴ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | 含浸コンボリュートブーツ |
JP2002114971A (ja) * | 2000-10-05 | 2002-04-16 | Nippon Shokubai Co Ltd | 防水材組成物及び防水構造体 |
JP2002194189A (ja) * | 2000-12-27 | 2002-07-10 | Du Pont Toray Co Ltd | ポリエステルブロック共重合体組成物 |
JP2003227568A (ja) * | 1999-08-06 | 2003-08-15 | Toyo Tire & Rubber Co Ltd | 樹脂製フレキシブルブーツ及びその製造方法 |
-
2004
- 2004-01-19 WO PCT/JP2004/000378 patent/WO2005068864A1/ja active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04220435A (ja) * | 1990-03-09 | 1992-08-11 | Union Carbide Chem & Plast Co Inc | 低密度ポリエチレンの押出方法 |
JPH07263071A (ja) * | 1994-03-28 | 1995-10-13 | Yazaki Corp | コネクタ防水用シール部品 |
JP2001523799A (ja) * | 1997-11-14 | 2001-11-27 | ジー・ケー・エヌ・オートモーティヴ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング | 含浸コンボリュートブーツ |
JPH11199780A (ja) * | 1998-01-07 | 1999-07-27 | Toyo Tire & Rubber Co Ltd | 熱可塑性エラストマー樹脂製のフレキシブルジョイントブーツ |
JP2003227568A (ja) * | 1999-08-06 | 2003-08-15 | Toyo Tire & Rubber Co Ltd | 樹脂製フレキシブルブーツ及びその製造方法 |
JP2002114971A (ja) * | 2000-10-05 | 2002-04-16 | Nippon Shokubai Co Ltd | 防水材組成物及び防水構造体 |
JP2002194189A (ja) * | 2000-12-27 | 2002-07-10 | Du Pont Toray Co Ltd | ポリエステルブロック共重合体組成物 |
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