WO2001061221A1 - Bague d'etancheite - Google Patents

Bague d'etancheite Download PDF

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Publication number
WO2001061221A1
WO2001061221A1 PCT/JP2001/000918 JP0100918W WO0161221A1 WO 2001061221 A1 WO2001061221 A1 WO 2001061221A1 JP 0100918 W JP0100918 W JP 0100918W WO 0161221 A1 WO0161221 A1 WO 0161221A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal ring
outer diameter
ring
test
crystallinity
Prior art date
Application number
PCT/JP2001/000918
Other languages
English (en)
Japanese (ja)
Inventor
Tomihiko Yanagiguchi
Masamichi Sukegawa
Michio Asano
Original Assignee
Daikin Industries, 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 Daikin Industries, Ltd. filed Critical Daikin Industries, Ltd.
Publication of WO2001061221A1 publication Critical patent/WO2001061221A1/fr

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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
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
    • F16J15/102—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by material

Definitions

  • the present invention relates to a seal ring, especially a seal ring that is excellent in durability and also excellent in mountability.
  • INDUSTRIAL APPLICABILITY The seal ring of the present invention can be suitably used particularly as a seal ring for a knob device of a power steering of an automobile.
  • Polytetrafluoroethylene (PTFE) is used as a sliding member at high temperature and high hydraulic pressure by taking advantage of its properties such as non-adhesiveness, low sliding properties, and heat resistance. Used as a material for sealing rings
  • Such sealings are often of the endless type, for example of the type shown in schematic cross-section in Fig. 1, and are usually outlined in Fig. 2. It is used as shown in the cross-sectional view.
  • the seal ring 1 is a relative part of the rotating part and the sliding part; fit between the two moving members (eight housing 2 and seal ring set body 3). It is a ring-shaped member that is fitted and seals the coil 4.
  • the sealing ring 1 is wound around the sealing set body 3, and the driving surface between the sealing ring 1 and the housing 2 is formed. It is forming.
  • the sealing set body 3 rotates with respect to the housing 2, but a relatively high hydraulic pressure is applied from the hole 4. If a load is applied that causes repetitive rotation in the forward and reverse directions, the breakage will occur relatively quickly, and leakage of oil 4 will occur. Sometimes .
  • the seal ring 1 of the endless type When the seal ring 1 of the endless type is wound around the seal ring set body 3, the seal ring 1 is stretched like a rubber band. Although a certain degree of rigidity is required to mount the product, it is necessary to return to the original shape immediately after mounting.
  • the inventors of the present invention have conducted various studies to develop a seal ring that has both good durability and good wearability. By controlling the degree of crystallinity so that the degree of crystallinity of the PTFE falls within a specific range, it has been found that the intended effect can be obtained. Was completed. Disclosure of invention
  • the present invention relates to a sealing ring comprising a PTFE having a crystallinity of 25 to 35%.
  • TFE tetrafluoroethylene
  • It may be a homopolymer of PTFE or a PTFE modified with a monomer copolymerizable with PTFE.
  • the sealing of the present invention may or may not contain a filler.
  • a filler When a filler is blended, the aromatic polystyrene benzene ester heat-resistant resin powder, graphite powder, carbon fiber, bronze powder, or a mixture of these two types can be used. It is desirable to use the above.
  • the seal ring of the present invention is particularly useful as a valve device for a power steering of an automobile.
  • the seal ring of the present invention has a durability that is not damaged in 200,000 cycles when a dynamic cycle is applied under the following condition (1). Preferred from the point of view.
  • Testing equipment Sealing durability evaluation testing equipment based on rack and pinion type power steering equipment
  • One cycle is a cycle that lasts two seconds.
  • One ring built-in member Carbon steel (JIS SG405
  • Test method Cylindrical base with taper (tilt ratio 1/10) After increasing the inner diameter of the seal ring by 10% through the test seal ring through a jig in the shape of a circle, immediately measure the outer diameter of the seal ring, and then Outer diameter before test / outer diameter before test) / XI 00 is the outer diameter change rate (%).
  • Test seal ring A rectangular shape with a cross section of 1.5 mm in length and 1.88 mm in width, with an inner diameter of 33.4 mm and an outer diameter of 36.4 mm.
  • FIG. 1 is a schematic cross-sectional view of one embodiment of the seal ring of the present invention.
  • FIG. 2 is a partial schematic cross-sectional view of an apparatus equipped with the seal ring of the present invention.
  • the seal ring of the present invention is made by compression molding, ram extrusion, paste extrusion, and isostatic molding of PTFE powder. It is manufactured by molding by a known molding method such as a hot-coining molding method.
  • the PTFE powder used as a raw material may be a homopolymer of TFE or PTFE modified with another monomer copolymerizable with TFE. Modified PTFE is preferred because of its excellent heat resistance, chemical resistance and creep resistance.
  • Modified PTFE which contains 0.001 to 1% by weight and cannot be melt-molded, is obtained.
  • perfluoro vinyl ethers include, for example, perfluoro (methyl vinyl ether) (PMVE) and perfluoro vinyl ether (PEVE). ), Perfluoro (propyl pillyl ether) (PPVE), perfluoro (butyl vinyl ether) (PBVE) and other perfluoro (alkyl vinyl ether). .
  • the average particle size of the PTFE powder is 10 to 120 m, and preferably 10 to 50111.
  • the seal ring of the present invention may contain a filler.
  • Particularly preferred fillers include aromatic polyoxybenzoyl ester heat-resistant resin powders, graphite powders, graphite fibers, bronze powders or these. Two or more of these species are extinct.
  • the aromatic polybenzoyl ester-based heat-resistant resin powder includes, for example, structural units (I):
  • Resin powders having a high thermal resistance, chemical resistance and abrasion resistance are preferred.
  • the average particle size is preferably 300 m, preferably 5 to: L 50 m, especially 10 to 50 m, because the dispersibility of the resin powder is good and It is preferable because it has excellent sealing ring strength.
  • the aromatic polyoxybenzene ester heat-resistant resin powder may be surface-treated with a silane coupling agent or the like, or may be of various types.
  • the powder may be water-repellent.
  • Examples of the lead powder include natural graphite, artificial graphite, expanded graphite, graphite fluoride, spherical carbon, carbon fluoride, graphite graphite, and the like. It will be. Particularly preferred is natural graphite.
  • the average particle size of the graphite powder is preferably from 0.1 to 500 m, particularly preferably from 5 to 20 m.
  • the average fiber length is 30 to 100 m at an average fiber diameter of 5 to 50 nm, especially the average fiber length is 10 to 20 m. Those from 50 to 200 are preferred.
  • Bronze powders include, for example, copper-tin alloys, or aluminum, zinc, lead, chromium, nickel, iron, and metal alloys. Metals containing one or more metal elements such as manganese, manganese, and phosphorus. Average particle size is 5 ⁇ 500 m, preferably 10 to: 10 Om.
  • fillers such as molybdenum disulfide, boron nitride, tungsten disulfide, myriki, and polyimid may be used.
  • the mixing ratio (% by weight) of the PTFE powder and the filler is 60 to 97/40 to 3 (total 100% by weight), preferably 70 to 95/30 to 5, In particular, it is set to 80 to 90/20 to 10. If too much filler is used, the intrinsic properties of PTFE will be impaired; if too little, self-wear resistance will be impaired, or the sealing performance under high pressure will be impaired. .
  • the crystallinity of PTFE of the obtained sealing ring is adjusted within the range of 25 to 35%.
  • a method of adjusting the crystallinity for example, (A) a method of controlling the cooling rate after firing (the higher the cooling rate, the smaller the crystallinity becomes. (Specifically, a method of taking out from the firing furnace immediately after firing and allowing it to cool naturally by allowing it to cool naturally in the air, etc.), (B) Before the firing, A method of controlling the heating rate (the higher the heating rate, the smaller the crystallinity becomes), and (C) a method of controlling the firing time (the firing time is reduced).
  • (D) firing temperature There is a method of controlling the temperature (the lower the firing temperature, the lower the degree of crystallinity), but the control process is easier.
  • the method (A) is preferred because the method can be simplified.
  • a preferable range of the crystallinity of the PTFE may be generated. Therefore, a suitable range is selected within the range of the crystallinity described above. do it .
  • the seal ring thus obtained has an excellent durability such that it does not break in 200,000 sliding cycles when measured under the test conditions (1) described above.
  • the outer diameter change rate measured by Z and the test conditions (2) described above is 3.4% or less, preferably 3.2% or less. It has excellent wearability.
  • the devices to which the seal ring of the present invention is applied include a hydraulic power steering device and an automatic transmission for automobiles. Session, engine piston ring, For industrial machinery, hydraulic cylinders, etc. are available. Of these, the resistance during sliding is low, the wear on the mating material is small, the seal deformation under high pressure (8 MPa or more) is small, and it can be used for a long time.
  • the endless type seal line for the power steering novele device which requires particularly low oil leakage characteristics. It is suitable as a bug.
  • PTFE powder (average particle size: 30 m) modified with 1% by weight of perfluoro (propyl vinyl ether) 80 parts by weight and aromatic polyoxybenzyl ester heat-resistant resin Fat powder (Sumika Super, manufactured by Sumitomo Chemical Co., Ltd., average particle size: 20 Hm) 15 parts by weight and carbon fiber (M200, manufactured by Crewe Corporation) 5 parts by weight of 6S, average fiber length 15111, and average fiber diameter of 00 ⁇ m) were premixed by a conventional method, and then granulated to prepare a resin powder for molding.
  • Fat powder Sudika Super, manufactured by Sumitomo Chemical Co., Ltd., average particle size: 20 Hm
  • carbon fiber M200, manufactured by Crewe Corporation
  • Measuring device Differential scanning calorimeter RDC 222 manufactured by Seiko Electronics Industry Co., Ltd. Measurement conditions: The temperature was raised to 250 ° C in 5 OZ minutes.
  • the heat of fusion of 1% crystallized PTFE is 993 J g in the above measurement.
  • a cycle consisting of a sliding cycle of forward rotation 95 rpm x 2 seconds and a reverse rotation of 95 rpm x 2 seconds is defined as one cycle.
  • a seal ring of the present invention was prepared in the same manner as in Example 1 except that it was naturally cooled in the air at a room temperature of 15 ° C, and crystallinity and durability were measured in the same manner as in Example 1. Sex was examined. Table 1 shows the results.
  • a seal ring of the present invention was prepared in the same manner as in Example 1 except that the firing time was set to 24 minutes, and the crystallinity and durability were examined in the same manner as in Example 1. Table 1 shows the results.
  • P ⁇ B Aromatic polycarbonate resin heat-resistant resin powder (Sumika Super, manufactured by Sumitomo Chemical Co., Ltd., average particle size: 20 m)
  • CF Rikibon fiber (M2006S manufactured by Kureha Co., Ltd., average fiber length: 15 am, average fiber diameter: 10 Om)
  • a seal ring of the present invention was prepared in the same manner as in Example 3 except that it was naturally cooled in the air at a room temperature of 15 ° C, and crystallinity and durability were determined in the same manner as in Example 1. The sex was examined. The results are shown in Table 2.
  • a seal ring of the present invention was prepared in the same manner as in Example 3 except that it was naturally cooled in the air at a room temperature of 10 ° C. The durability was checked. The results are shown in Table 2.
  • a seal ring of the present invention was produced in the same manner as in Example 3 except that the formation time was changed to 24 minutes, and the crystallinity and durability were examined in the same manner as in Example 1.
  • Table 2 shows the results.
  • the abbreviations in Table 2 are the following components.
  • P 0 B Aromatic polybenzoyl ester heat-resistant resin powder (Sumika Super, manufactured by Sumitomo Chemical Co., Ltd., average particle size: 20 m)
  • GR Natural graphite powder (CPB—300, manufactured by Chuetsu Graphite Co., Ltd., average particle size 9 / m) Table 2
  • a seal ring of the present invention was produced in the same manner as in Example 1, and the crystallinity was measured in the same manner as in Example 1. Table 3 shows the results.
  • a sealing ring of the present invention was prepared in the same manner as in Example 2, and the crystallinity and the outer diameter change rate were examined in the same manner as in Example 1 and in the same manner as in Example 6.
  • Table 3 shows the results.
  • a seal ring of the present invention was prepared in the same manner as in Example 6 except that the cooling rate to room temperature after firing was set to 50 ° CZ hours, and the crystal was formed in the same manner as in Example 1. The degree of change and the outer diameter change rate were examined in the same manner as in Example 6. Table 3 shows the results.
  • P ⁇ B Aromatic polycarbonate resin heat-resistant resin powder (Sumikaspar, Sumitomo Chemical Co., Ltd., average particle size 20 m)
  • TFE homopolymer powder (average particle size 20 m) 60 weights Parts and bronze powder (SD—200, average particle size: 20 m, manufactured by Fukuda Metals Co., Ltd.) 30 parts by weight and carbon fiber (M20 manufactured by Cleha Co., Ltd.) 0.6 S, an average fiber length of 15 m, and an average fiber diameter of 100 m) 10 parts by weight were premixed by an ordinary method, and then granulated to prepare a resin powder for molding.
  • This molding resin powder is used to press-mold into a sealing ring, baked at 360 ° C for 48 minutes, and then immediately to room temperature.
  • a U-ring (ring with an inner diameter of 33.4 mm, an outer diameter of 36.4 mm, and a height of 1.88 mm) was produced.
  • the crystallinity was measured in the same manner as in Example 1 and the outer diameter change rate was measured in the same manner as in Example 6.
  • Table 4 shows the results.
  • a sealing ring of the present invention was prepared in the same manner as in Example 8 except that the sample was naturally cooled in the air at 1 ⁇ 2L ⁇ 5 ° C, and the degree of crystallinity was measured in the same manner as in Example 1. The outer diameter change rate was examined in the same manner as in Example 6. Table 4 shows the results.
  • a sealing ring of the present invention was prepared in the same manner as in Example 8 except that the cooling rate to room temperature after firing was set to 50 Z hours, and the crystallinity was determined in the same manner as in Example 1. The outer diameter change rate was examined in the same manner as in Example 6. Table 4 shows the results.
  • BZ Bronze powder (SD—200, average particle size 20 m, manufactured by Fukuda Metals Co., Ltd.)
  • the seal ring of the present invention does not break for a long period of time even when used under high pressure, has excellent durability, has a small outer diameter change rate, and has excellent mounting properties. Therefore, a stable sealing effect can be obtained for a long period of time, and in particular, it has a favorable characteristic of the seal ring of the endless type.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gasket Seals (AREA)
  • Sealing Devices (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Sealing Material Composition (AREA)

Abstract

La présente invention concerne une bague d'étanchéité réalisée en polytétrafluoroéthylène qui présente une cristallinité comprise entre 25 et 35 %, ne s'use pas sur une longue durée même lorsqu'on l'utilise dans des conditions de fortes pressions, présente une excellente durabilité, une faible variation de son diamètre et qui est en outre très facile à installer. Cette bague d'étanchéité assure un effet d'étanchéité stable pendant une période prolongée et possède, plus particulièrement, les caractéristiques appropriées d'une bague d'étanchéité du type à durée infinie.
PCT/JP2001/000918 2000-02-18 2001-02-09 Bague d'etancheite WO2001061221A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000-41827 2000-02-18
JP2000041827 2000-02-18
JP2000184810A JP2001304420A (ja) 2000-02-18 2000-06-20 シールリング
JP2000-184810 2000-06-20

Publications (1)

Publication Number Publication Date
WO2001061221A1 true WO2001061221A1 (fr) 2001-08-23

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ID=26585698

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2001/000918 WO2001061221A1 (fr) 2000-02-18 2001-02-09 Bague d'etancheite

Country Status (2)

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JP (1) JP2001304420A (fr)
WO (1) WO2001061221A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021210435A1 (fr) * 2020-04-15 2021-10-21 株式会社バルカー Matériau d'étanchéité

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040046144A1 (en) * 2000-12-22 2004-03-11 Tomihiko Yanagiguchi Seal ring and power steering valve device provided with it
JP4953222B2 (ja) * 2005-05-20 2012-06-13 本田技研工業株式会社 球帯状シール体
US8338519B2 (en) 2005-10-12 2012-12-25 Nok Corporation PTFE resin composition
US7528221B2 (en) 2005-11-30 2009-05-05 Daikin Industries, Ltd. Modified polytetrafluoethylene molded article and process for manufacture thereof
PL2082125T3 (pl) * 2006-11-06 2015-06-30 Garlock Sealing Tech Llc Niskoobciążeniowa uszczelka i sposób jej wytwarzania
JP2008185075A (ja) * 2007-01-29 2008-08-14 Uchiyama Mfg Corp ガスケット
JP6045952B2 (ja) * 2013-03-26 2016-12-14 ニッタ株式会社 ボールねじ、シール材、及び、シール構造
CN104395643B (zh) 2012-06-22 2017-03-15 新田株式会社 滚珠丝杠、密封件以及密封构造
JP6045822B2 (ja) * 2012-06-22 2016-12-14 ニッタ株式会社 ボールねじ、シール材、及び、シール構造
JP6165460B2 (ja) * 2013-02-15 2017-07-19 ニッタ株式会社 ボールねじ、シール材、及び、シール構造
JP2019026664A (ja) * 2017-07-26 2019-02-21 Nok株式会社 ポリテトラフルオロエチレン配合物、シール部材及び摺動部材

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Publication number Priority date Publication date Assignee Title
JPH03153974A (ja) * 1989-11-08 1991-07-01 Moon Star Co バルブシール部にシールリングを嵌合する方法
WO1994000511A1 (fr) * 1992-06-25 1994-01-06 E.I. Du Pont De Nemours And Company Polytetrafluorethylene poreux et procede de preparation
JP2000026614A (ja) * 1998-07-09 2000-01-25 Reitec:Kk 超微粉末状の架橋ポリテトラフルオロエチレン樹脂およびその製造方法

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JPS54102448A (en) * 1978-01-28 1979-08-11 Sakagami Seisakushiyo Kk Method of producing seal ring
JPS5819397A (ja) * 1981-07-28 1983-02-04 Sumitomo Chem Co Ltd 摺動材組成物
JPS62201996A (ja) * 1986-02-28 1987-09-05 Nok Corp 摺動部用部材
JPH0320347A (ja) * 1989-06-15 1991-01-29 Mitsubishi Electric Corp 摺動材料
JP2864848B2 (ja) * 1992-02-28 1999-03-08 株式会社阪上製作所 シール装置
JPH07179846A (ja) * 1993-12-24 1995-07-18 Ntn Corp オイルシールリング
JPH07286670A (ja) * 1994-02-28 1995-10-31 Ntn Corp オイルシールリング
JPH1019128A (ja) * 1996-07-01 1998-01-23 Nok Corp シールリングの製造方法及びシールリング
JPH1170558A (ja) * 1997-08-29 1999-03-16 Nissei Denki Kk 可動部用耐スパッタポリテトラフルオロエチレンチューブ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03153974A (ja) * 1989-11-08 1991-07-01 Moon Star Co バルブシール部にシールリングを嵌合する方法
WO1994000511A1 (fr) * 1992-06-25 1994-01-06 E.I. Du Pont De Nemours And Company Polytetrafluorethylene poreux et procede de preparation
JP2000026614A (ja) * 1998-07-09 2000-01-25 Reitec:Kk 超微粉末状の架橋ポリテトラフルオロエチレン樹脂およびその製造方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021210435A1 (fr) * 2020-04-15 2021-10-21 株式会社バルカー Matériau d'étanchéité

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