WO2007058243A1 - Joint homocinétique à graisse enfermée - Google Patents

Joint homocinétique à graisse enfermée Download PDF

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Publication number
WO2007058243A1
WO2007058243A1 PCT/JP2006/322831 JP2006322831W WO2007058243A1 WO 2007058243 A1 WO2007058243 A1 WO 2007058243A1 JP 2006322831 W JP2006322831 W JP 2006322831W WO 2007058243 A1 WO2007058243 A1 WO 2007058243A1
Authority
WO
WIPO (PCT)
Prior art keywords
boot
grease
constant velocity
universal joint
filled
Prior art date
Application number
PCT/JP2006/322831
Other languages
English (en)
Japanese (ja)
Inventor
Mika Kohara
Original Assignee
Ntn Corporation
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
Priority claimed from JP2005334357A external-priority patent/JP2007139088A/ja
Priority claimed from JP2005334261A external-priority patent/JP2007139085A/ja
Application filed by Ntn Corporation filed Critical Ntn Corporation
Publication of WO2007058243A1 publication Critical patent/WO2007058243A1/fr

Links

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
    • 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
    • F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
    • F16D3/20—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members
    • F16D3/22—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts one coupling part entering a sleeve of the other coupling part and connected thereto by sliding or rolling members the rolling members being balls, rollers, or the like, guided in grooves or sockets in both coupling parts
    • 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
    • F16D2300/00—Special features for couplings or clutches
    • F16D2300/06—Lubrication details not provided for in group F16D13/74

Definitions

  • the present invention is used for, for example, a joint of a rotating shaft of an automobile or other power transmission system, and is equipped with a grease-degraded constant velocity fitted with a bendable deformable boot that seals and protects a joint mechanism that holds grease. It relates to a universal joint.
  • the outer peripheral surface of the inner ring 1 and the inner peripheral surface of the outer ring 2 have a plurality of, for example, about six extending in the axial direction. Grooves 3 and 4 are formed, and the grooves 3 and 4 are formed on the inner ring 1 and the outer ring 2 so as to face each other.
  • the rolling elements 5 mounted so as to be rotatable by being guided by these pairs of grooves are rotatably held by the cage 6, and thus the crossing angles of the respective axes of the inner ring 1 and the outer ring 2 are determined.
  • Such a constant velocity joint is fitted with a rubber or grease boot 8 so as to straddle the outer periphery of the outer ring 2 and the outer periphery of the shaft 7 held by the inner ring 1.
  • Lubricating grease (not shown) was enclosed in 70% or more of the total volume including the internal space volume of 8.
  • the main part where the lubricant is actually required is a sliding part that is housed inside the outer ring that is not inside the boot, and exists between the inner ring of the outer ring rolling element (ball) cage, If the lubrication grease is held in the sliding part inside the outer ring, the required amount of lubrication oil is supplied. Therefore, as described above, a large amount of lubrication grease of 70% or more including the internal space volume of the boot 8 There is no need to enclose.
  • the boot When rotating at high speed, the boot is stretched or expanded due to the centrifugal force applied to the lubricating grease, the bent part of the boot, the overlapping part of the boot, the boot band fixed to the shaft, It is also expected that the fixed part of the metal will be worn and damaged by rubbing.
  • the lubrication grease force that hardens at low temperatures also weakens the durability of the boot even if it rubs against the boot, so that the boot replacement time is accelerated, and at that time the lubricating grease is filled and the boot replacement work Is complicated.
  • an oil-impregnated foam in which a foamed synthetic resin such as a silicone foam is impregnated with a lubricating oil in advance is prepared, and this is filled in a boot, that is, using lubricating grease.
  • a constant velocity joint that has a low specific gravity and is made as light as possible in the boot by impregnating a foamed synthetic resin with a lubricating oil (Patent Document 1).
  • Patent Document 1 Japanese Patent Laid-Open No. 9 42297
  • the constant velocity joint is not much different from the case where the lubricating grease is directly filled in the boot. Therefore, a considerable centrifugal force acts on the oil-impregnated foamed synthetic resin in the boot, and the boot expands so that the rubber boot is pushed to the outside of the internal force, and the material of the boot deteriorates due to repeated tension and wear at that time Problem of damage.
  • the lubricating oil impregnated with the foamed synthetic resin may promote deterioration of the boot material by coming into contact with the boot, and the boot may be cracked.
  • the problem of the present invention is to solve the above-described problems, and the constant velocity joint boot does not expand due to the centrifugal force acting on the mass of the lubricating oil in the boot and does not come off the boot band. Even if it is indirectly in contact with oil for a long time, it will not be damaged, and the lubricating grease from the sliding part into the boot It is to configure the constant velocity self-joint so that the movement is suppressed and lubrication grease does not dry up in the sliding part of the inner ring and the outer ring.
  • lubricating grease is filled between the outer ring and the inner ring of the constant velocity universal joint so as to straddle the outer periphery of the outer ring and the shaft held by the inner ring.
  • a rubber or rosin boot is attached, and the inside of this boot is filled with a foamed elastic sorbent having a specific gravity lower than that of the lubricating grease to prevent the lubricating grease from entering the boot. It was a joint.
  • the grease-filled constant velocity universal joint of the present invention configured as described above fills the space between the outer ring and the inner ring of the constant velocity universal joint by filling the inside of the boot with a foamed elastic grease.
  • Lubricating grease force When the boot is bent and deformed, it does not enter the boot, so the lubricant does not disperse and is efficiently supplied concentrated on the required sliding part.
  • the foamed elastic grease inside the boot is adjusted to have a lower specific gravity than the lubricating grease, and in particular, adjusted to a lower specific gravity than the lubricating grease by the amount of bubbles (foaming amount).
  • the centrifugal force is smaller than that of conventional oil-impregnated oils containing liquid lubricating oil or lubricating grease. The deformation and wearing of the boot will not occur, and the boot will not be damaged due to so-called rotational expansion.
  • a granular foamed elastic resin having an appropriate particle size is filled inside the boot so as not to infiltrate the lubricating grease, so that it is sealed between the outer ring and the inner ring of the constant velocity universal joint. Even when the boot is bent and deformed, the filled lubricating grease hardly penetrates into the inside of the boot, so that the lubricant is efficiently supplied in a concentrated manner on the sliding part where it is necessary.
  • the grease-filled constant velocity universal joint of the present invention has no lubricating grease in the boot even when used at a low temperature such as in the severe winter season. The friction between the boot and the boot prevents damage to the boot.
  • the foamed elastic resin is a non-oil-containing foamed elastic resin foamed in a closed cell state.
  • the foamed elastic resin is a speedy joint such as a grease-filled elastic resin having a non-oil-containing skin layer on the outermost surface.
  • the foamed cocoon resin is a flexible urethane foam.
  • Soft urethane foam can be hardened at room temperature, and the boot will not be damaged by heat.
  • the foamed elastic resin is filled to every corner of the bellows and is integrated with the boot, so that the boot is not deformed so that the bellows are in contact with each other. Boots are hard to damage.
  • a constant velocity universal joint a plurality of axially extending grooves are provided on the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring so as to face each other, and are rotated so as to be rotatably guided by the pair of grooves.
  • the lubricating grease filled in the outer ring acts efficiently on the sliding portion even if the amount is relatively small. Therefore, a plurality of grooves and rolling elements extending in the axial direction on the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring, and sliding portions between the rolling elements and the cage can be reliably lubricated.
  • lubricating grease is filled between the outer ring and the inner ring of the constant velocity universal joint, and the rubber boot is filled with low-specific gravity and elastic foamed elastic resin so as to be integrally molded. Because it is a grease-filled constant velocity universal joint, the boot force of the constant velocity joint does not cause deformation such as expansion due to the centrifugal force acting on the mass of lubricating oil in the boot, making it difficult to come off from the boot band, and excessive lubrication grease There is an advantage that lubricating grease does not easily occur in the sliding portion without entering the inside.
  • the foamed elastic resin is a non-oil-containing foamed elastic resin foamed in a closed cell state, such as a flexible urethane foam, or a foamed elastic resin having a skin layer on the outermost surface
  • the boot Lubricating oil or the like is less likely to enter the inside, and the above-described effect is further ensured.
  • the boot has a bellows structure, the deformation of the boot in which the bellows contact each other is prevented, and the boot is not easily damaged during use.
  • the constant velocity joint of the specified structure is efficiently lubricated with a small amount of lubricating grease, and the sliding of the inner ring and outer ring groove and the rolling element as the sliding part, and the rolling element and the cage are surely lubricated.
  • FIG. 1 A sectional view of the constant velocity universal joint of the first embodiment.
  • the grease-filled constant velocity universal joint is provided with a plurality of axially extending grooves 3 and 4 on the outer peripheral surface of the inner ring 1 and the inner peripheral surface of the outer ring 2 so as to face each other.
  • a ball-shaped rolling element 5 is held by a cage (retainer) 6 so as to be rotatably guided by the pair of grooves 3 and 4, thereby crossing the respective axes of the inner ring 1 and the outer ring 2.
  • a cage (retainer) 6 so as to be rotatably guided by the pair of grooves 3 and 4, thereby crossing the respective axes of the inner ring 1 and the outer ring 2.
  • the constant velocity joint having such a structure is filled with lubricating grease between the outer ring 2 and the inner ring 1 so that the rubber extends over the outer periphery of the outer ring 2 and the outer periphery of the shaft 7 held by the inner ring 1.
  • a bellows type boot 8 is installed, and this boot 8 is filled with a flexible elastic foamed elastic resin 9 that can follow the bending deformation of the boot 8 and having a specific gravity lower than that of the lubricating grease.
  • boot bands belt-like fasteners
  • the grease-filled constant velocity universal joint of the second embodiment is different from the structure of the first embodiment in that instead of integrally molding the foamed brittle resin 9 with the boot 8, the boot 8
  • the inner part of the belt is packed with a granular foamed elastic resin 9 'having a flexible elasticity capable of following the bending deformation of the boot 8 so that a gap for allowing the lubricating grease to enter is as close as possible, and a belt-like fastener (so-called boot band) ) Fastened with 10 and 11 and sealed.
  • the boot used in the present invention has a rubber or grease material strength, and has a sealing property against dust and water in the atmosphere, tear resistance, oil resistance, heat resistance, wear resistance, etc.
  • chloroprene rubber or thermoplastic polyester elastomer manufactured by Toray DuPont: Hytrel
  • plasticizers, softeners, lubricants, antioxidants, reinforcing agents and the like may be added.
  • the lubricating grease used in the present invention is not particularly limited in its type.
  • base oil is increased with a metal stone-based thickener, and further, such as molybdenum disulfide molybdenum.
  • An example of using an extreme pressure agent added can be given.
  • Examples of the base oil include mineral oils, ester-based synthetic oils, ether-based synthetic oils, hydrocarbon-based synthetic oils, and the like, and may be a single component or a mixed component base oil. Of course.
  • the foamed elastic resin used in the present invention employs a soft elastic resin having oil resistance and heat resistance.
  • a soft polyurethane resin foam for example, a silicone resin foam, a polyethylene foam And foams such as polypropylene foam and ethylene acetate butyl copolymer.
  • the foamed elastic resin may be a closed-cell foam or an open-cell foam as long as it has a required elastic force, but preferably a closed-cell foam.
  • a soft open-cell foam it is preferable to form a skin layer that does not have air bubbles on the surface of the molded body in the boot that contacts the outer ring, and to make the lubricant as hard as possible to impregnate. That's right.
  • the particle size and molding conditions of the granular foamed elastic resin used in the second embodiment are not particularly limited, but the smaller particle size than the large particle size is bent in the bent bellows boot. This is preferable because it can be densely packed.
  • a suitable particle size is preferably a substantially spherical or elliptical sphere having a diameter or major axis of 1 to about LOmm. A more preferred diameter or major axis is 1 to 5 mm, further 1 to 3 mm.
  • the raw material mainly composed of isocyanate and the raw material mainly composed of polyol are mixed using a RIM (Reaction Injection Molding) developing machine, etc.
  • the raw material mixture can be injected and cured inside, or it can be formed into a spherical shape or an elliptical spherical shape using a molding machine or the like.
  • the amount of bubbles can be adjusted by dissolving at least one gas selected from an inert gas and air in a raw material mainly composed of polyol.
  • polyol component constituting the liquid polyurethane raw material
  • polyols such as polyether polyols, polyester polyols, and polymer polyols that are generally used in the production of flexible polyurethane foams can be used.
  • the polyisocyanate component is a known polyisocyanate having at least two or more functional groups such as 2, 4- and 2, 6-tolylene diisocyanate (TDI), orthotoluidine diisocyanate (TODI), Naphthylene diisocyanate (NDI), xylylene diisocyanate (XDI), 4, 4'-diphenylmethane diisocyanate (MDI), and carbodiimide modified MDI, polyethylene polyisocyanate, polymeric polyisocyanate Etc. can be used alone or in combination.
  • TDI 2, 4- and 2, 6-tolylene diisocyanate
  • TODI orthotoluidine diisocyanate
  • NDI Naphthylene diisocyanate
  • XDI xylylene diisocyanate
  • MDI 4, 4'-diphenylmethane diisocyanate
  • carbodiimide modified MDI polyethylene polyisocyanate, polymeric polyisocyanate
  • silicone resin for example, silicone foam SEF series manufactured by Toray 'Dowcoung' Silicone Co. can be employed.
  • molybdenum Lubricating grease containing 3% by weight of dialkyl dithiocarbamate and 3% by weight of zinc dithiocarbamate was prepared by a conventional method.
  • the obtained lubricating grease is filled in the gap between the outer ring and the inner ring of the constant velocity universal joint, and a bellows type formed by a thermoplastic polyester elastomer (manufactured by Toray DuPont: Hytrel) on it. I wore boots.
  • a durability test was conducted when the obtained constant velocity universal joint was rotated at a predetermined operating angle under a predetermined load and rotated at room temperature for 650 hours.
  • Lubricating grease prepared in exactly the same manner as in Example 1 was filled in the gap between the outer ring and inner ring of the constant velocity universal joint without the shaft.
  • a bellows type boot made of thermoplastic polyester elastomer (manufactured by Toray DuPont: Hytrel) is attached to the outer periphery of the shaft that can be attached to the inner ring of the constant velocity universal joint, A metal boot band was fitted to the small diameter part of the boot and fastened tightly to the outer periphery of the shaft.
  • the opening of the large-diameter portion of the boot faces upward, and this opening force is filled with foamed polyurethane foam by filling the boot with a large-diameter portion edge and filling the inside.
  • a shaft with boots filled with polyurethane foam was made.
  • Lithium sarcophagus containing mineral oil as a base oil and 12 hydroxystearic acid as a fatty acid is added as a thickening agent in an amount of 10% by weight, and as an extreme pressure additive, 2% by weight of molybdenum disulfide and molybdenum.
  • 3% by weight of dialkyl dithiocarbamate and zinc dithiocarbamate Lubricating grease containing 3% by weight was prepared by a conventional method.
  • the obtained lubricating grease is filled in the gap between the outer ring and the inner ring of the constant velocity universal joint, and a bellows type formed by a thermoplastic polyester elastomer (manufactured by Toray DuPont: Hytrel) on it. I wore boots.
  • a metal boot band is fitted and fastened to the large diameter portion, and a 2mm diameter spherical granular foamed elastic resin having a soft polyurethane foam force is formed from the gap between the inner edge of the small diameter portion and the shaft.
  • a metal bracelet was fitted into the small diameter portion and fastened to obtain a grease-filled constant velocity universal joint as shown in FIG.
  • a durability test was conducted when the obtained constant velocity universal joint was rotated at a predetermined operating angle under a predetermined load and rotated at room temperature for 650 hours.
  • Lubricating grease prepared in exactly the same manner as in Example 3 was filled in the gap between the outer ring and inner ring of the constant velocity universal joint without the shaft.
  • a bellows type boot formed of a thermoplastic polyester elastomer (manufactured by Toray DuPont: Hytrel) is attached to the outer periphery of a shaft that can be attached to the inner ring of the constant velocity universal joint.
  • a metal boot band was fitted to the small diameter part of the boot and fastened tightly to the outer periphery of the shaft.
  • the opening of the large-diameter portion of the boot is directed upward, and the opening force of the spherical soft polyurethane foam (used in Example 3 so as to leave the large-diameter portion edge and fill the inside of the boot)
  • the shaft with the boots filled with soft polyurethane foam particles was prepared.
  • the obtained constant velocity universal joint was loaded with a constant load at a predetermined operating angle and at room temperature for 650 hours.
  • the durability test of rotating was performed, and the appearance immediately after the test, the inside of the boot (cut and observed if necessary) and the sliding part inside the outer ring of the joint were disassembled and observed.
  • the inner / outer boots and the boots were not damaged or abnormally worn.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Devices (AREA)
  • Diaphragms And Bellows (AREA)

Abstract

La présente invention concerne un joint homocinétique qui peut empêcher que le soufflet du joint homocinétique ne soit endommagé à cause de la dilatation du soufflet ou parce que le soufflet est sorti de son collier de serrage par suite d'une force centrifuge résultant de l'action de la masse d'huile lubrifiante sur le soufflet et qui, en même temps, peut empêcher la graisse lubrifiante de passer d'une pièce coulissante dans le soufflet et prévenir l'épuisement de la graisse lubrifiante dans la partie coulissante dans les bagues intérieure et extérieure. On remplit de graisse lubrifiante l'espace compris entre la bague extérieure (2) et la bague intérieure (1). Un soufflet (8) en caoutchouc ou en résine est monté de façon à reposer à cheval sur la circonférence extérieure de l'anneau extérieur (2) et la circonférence extérieure de l'arbre (7) tenu par l'anneau intérieur (1). Le soufflet (8) présente sur sa face intérieure une mousse de résine élastique (9) introduite dans le soufflet (8) et moulée d'une seule pièce avec lui. La mousse de résine élastique (9) a une élasticité suffisamment élevée pour suivre les déformations en flexion du soufflet (8) et a une masse spécifique plus faible que la graisse lubrifiante. Les parties terminales du soufflet (8) sont fixées avec des outils de fixation en forme de ceinture (ce que l'on appelle les colliers de serrage) (10, 11) pour que la fermeture soit hermétique.
PCT/JP2006/322831 2005-11-18 2006-11-16 Joint homocinétique à graisse enfermée WO2007058243A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2005334357A JP2007139088A (ja) 2005-11-18 2005-11-18 グリース封入等速自在継手
JP2005-334261 2005-11-18
JP2005-334357 2005-11-18
JP2005334261A JP2007139085A (ja) 2005-11-18 2005-11-18 グリース封入等速自在継手

Publications (1)

Publication Number Publication Date
WO2007058243A1 true WO2007058243A1 (fr) 2007-05-24

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Application Number Title Priority Date Filing Date
PCT/JP2006/322831 WO2007058243A1 (fr) 2005-11-18 2006-11-16 Joint homocinétique à graisse enfermée

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Country Link
WO (1) WO2007058243A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008146804A1 (fr) * 2007-05-29 2008-12-04 Ntn Corporation Lubrifiant en mousse solide, assemblage universel, procédé de production de ceux-ci, paliers prélubrifiés avec un lubrifiant en mousse solide, partie d'élément de machine et système de lubrification
JP2008297371A (ja) * 2007-05-29 2008-12-11 Ntn Corp 多孔性固形潤滑剤およびその製造方法
CN111094767A (zh) * 2017-09-13 2020-05-01 怡来汽车电子底盘系统有限公司 用于等速万向节的护套夹紧结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5379856A (en) * 1993-10-12 1995-01-10 Trw Inc. Rack and pinion steering gear assembly
JPH0942297A (ja) * 1995-07-28 1997-02-10 Ntn Corp 内外輪結合体の潤滑装置
US20040017046A1 (en) * 2001-01-05 2004-01-29 Frazer Richard D. Transmission joint boot

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5379856A (en) * 1993-10-12 1995-01-10 Trw Inc. Rack and pinion steering gear assembly
JPH0942297A (ja) * 1995-07-28 1997-02-10 Ntn Corp 内外輪結合体の潤滑装置
US20040017046A1 (en) * 2001-01-05 2004-01-29 Frazer Richard D. Transmission joint boot

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008146804A1 (fr) * 2007-05-29 2008-12-04 Ntn Corporation Lubrifiant en mousse solide, assemblage universel, procédé de production de ceux-ci, paliers prélubrifiés avec un lubrifiant en mousse solide, partie d'élément de machine et système de lubrification
JP2008297371A (ja) * 2007-05-29 2008-12-11 Ntn Corp 多孔性固形潤滑剤およびその製造方法
CN111094767A (zh) * 2017-09-13 2020-05-01 怡来汽车电子底盘系统有限公司 用于等速万向节的护套夹紧结构
CN111094767B (zh) * 2017-09-13 2021-12-14 怡来汽车电子底盘系统有限公司 用于等速万向节的护套夹紧结构

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