WO2014129719A1 - 이중 구조의 부시 및 이를 구비하는 베어링 조립체 - Google Patents
이중 구조의 부시 및 이를 구비하는 베어링 조립체 Download PDFInfo
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- WO2014129719A1 WO2014129719A1 PCT/KR2013/009324 KR2013009324W WO2014129719A1 WO 2014129719 A1 WO2014129719 A1 WO 2014129719A1 KR 2013009324 W KR2013009324 W KR 2013009324W WO 2014129719 A1 WO2014129719 A1 WO 2014129719A1
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- Prior art keywords
- bush
- layer
- composite material
- polymer composite
- load
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/203—Multilayer structures, e.g. sleeves comprising a plastic lining
- F16C33/205—Multilayer structures, e.g. sleeves comprising a plastic lining with two layers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/006—Pivot joint assemblies
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
- E02F9/2275—Hoses and supports therefor and protection therefor
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/208—Methods of manufacture, e.g. shaping, applying coatings
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/24—Brasses; Bushes; Linings with different areas of the sliding surface consisting of different materials
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2202/00—Solid materials defined by their properties
- F16C2202/50—Lubricating properties
- F16C2202/52—Graphite
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/02—Plastics; Synthetic resins, e.g. rubbers comprising fillers, fibres
- F16C2208/04—Glass fibres
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/20—Thermoplastic resins
- F16C2208/30—Fluoropolymers
- F16C2208/32—Polytetrafluorethylene [PTFE]
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/80—Thermosetting resins
- F16C2208/82—Composites, i.e. fibre reinforced thermosetting resins
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/80—Thermosetting resins
- F16C2208/86—Epoxy resins
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/06—Temperature
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- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2350/00—Machines or articles related to building
- F16C2350/26—Excavators
Definitions
- the present invention relates to a dual-structure bush and a bearing assembly having the same, which can be used for joints operating at low speed and high loads.
- Construction machinery such as excavators, skid steer loaders, and the like, includes a number of joints, such as boom and arm connections, arm and bucket connections, and the like. Joints of such construction machinery are generally the case that the pin (pin) and the bush (bush) to the rocking motion in the lubricating environment by grease.
- FIG. 2 is a front joint portion 10 of the excavator as an example of a construction machine
- Figure 5 is a cross-sectional view showing a conventional bush in the direction perpendicular to the longitudinal direction of the pin in the joint portion 10 of the excavator.
- the joint part 10 includes a pin 12 connecting two members requiring joint motion, and a bush 11 for reducing frictional resistance generated between the pin and the pin hole. Consists of The pin 12 and the bush 11 generally oscillate in a lubricating environment with grease.
- the joint 10 may include a boss 13 of a housing supporting the pin and the bush and sealing means (not shown) to block contaminants. It includes.
- This operating condition is a typical average value, in which the surface pressure during the operating condition may rise instantaneously according to the working load, and in particular, the instantaneous surface pressure may be more than three times the average value due to the uneven load during operation depending on the operating conditions.
- the bush used under high speed and high surface pressure conditions requires excellent scuffing resistance and abrasion resistance.
- various compositions and types of products have been developed and used.
- the metal bush to form a groove (groove) or groove (dimple) on the inner circumferential surface of the metal rigid body to maximize the lubrication performance by the grease contained in the groove or groove;
- a metal bush whose surface is coated with self-lubricating particles to maximize lubrication performance;
- the construction machine front work machine is very unspecified and frequently changes in the direction and value of the load applied to each part due to the terrain, the working attitude of the equipment, the geology, etc., so that each part between the work causes bending, As a whole, unbalanced loads are generated and high loads are concentrated in the local area. This requires a high level of wear and impact resistance for all components, including bushes.
- An object of the present invention is to provide a bush that can be applied to a joint portion that operates at low speed and high load, and can exhibit excellent elasticity, recoverability, lubrication characteristics, and load resistance.
- the present invention provides a slide layer which contacts the inner circumferential surface so that the pin unit is rotatably supported; And a load supporting layer integrally stacked to surround the outer circumferential surface of the slide layer, the load supporting layer contacting the inner circumferential surface of the boss to support a radial load of the pin unit, wherein the softening point of the load supporting layer is 250 to 400 ° C., and the sliding The softening point of the layer is from 120 to 180 ° C., providing a double structure bush formed of a polymer composite material.
- the softening point of the said load support layer is 300-350 degreeC, and the softening point of the said sliding layer is 140-160 degreeC.
- the present invention provides a bearing assembly having a bush of the dual structure described above.
- the present invention is a bush made of a polymer composite material, unlike the conventional metal-based bush, can exhibit excellent elasticity and recoverability under operating conditions of low speed and high load, it can be deformed upon application of a local load to uniformly distribute the load, Therefore, it is possible to prevent breakage due to abnormal wear and impact due to stress concentration, wear resistance and impact resistance can be improved, and life characteristics can be improved.
- the present invention is integrally laminated so that the outer circumferential surface of the slide layer for contact receiving the pin unit on the inner circumferential surface is integrally laminated so as to surround the load supporting layer that is received in contact with the inner circumferential surface of the boss to support the radial load of the pin unit, the load supporting layer and the slide layer
- FIG. 1 is a cross-sectional view of a bush according to the present invention.
- Figure 2 shows an example of a joint that can be applied to the bush in the excavator.
- FIG. 3 is a cross-sectional view showing a dual-structure bush according to the present invention applied to the joint part disclosed in FIG. 2 in a direction perpendicular to the longitudinal direction of the pin.
- Figure 4 is a cross-sectional view showing a dual-type bush in the longitudinal direction of the pin according to the present invention applied to the joint portion shown in FIG.
- FIG. 5 is a cross-sectional view showing a conventional bush applied to the joint portion shown in Figure 2 in a direction perpendicular to the longitudinal direction of the pin.
- the present invention relates to a bush made of a polymer composite material, comprising: a slide layer which contacts and accommodates an inner circumferential surface of the pin unit so as to be rotatably supported, and is integrally laminated to surround the outer circumferential surface of the slide layer, It has a dual structure including a load supporting layer for supporting a radial load, characterized in that the softening point of the load supporting layer and the slide layer is adjusted to a specific range, respectively.
- the present inventors When the bush is manufactured by using a polymer composite material including a polymer matrix, a fibrous substrate, and self-lubricating particles, the present inventors maintain a high elasticity and load while operating at low speed and high load, unlike conventional metal bushes or porous sintered bushes. It was found that it could be recovered when not authorized.
- the bush made of the polymer composite material can continuously maintain a low coefficient of friction due to self-lubricating particles, it is possible to maintain an excellent lubrication environment without periodic greasing unlike the conventional bush.
- construction machinery In general, however, construction machinery is also used in the polar and tropical regions. Therefore, construction machinery requires a wide usable temperature, as well as high surface pressure levels and impact resistance. Therefore, it is very difficult to manufacture a bush made of a polymer composite material to replace the metal bush. Moreover, since most of the existing mechanical parts in contact with or interacting with the bush are made of cast steel or steel, when the bush made of polymer composite material is not considered, the correlation with the mechanical parts formed of cast steel or steel is not considered. This may cause problems that have not existed in the past. In particular, in the case of a polymer composite material, unlike a metal, it is easy to deform with a temperature change. Therefore, without considering the temperature dependency of such a polymer composite material, as described above, it is difficult to use the bush of the polymer composite material under a wide range of use conditions of construction machinery.
- a layer (using a polymer composite material including a polymer matrix and a fiber substrate on the outer circumferential surface of a layer made of a polymer composite material including a polymer matrix, a fiber substrate, and self-lubricating particles (hereinafter, 'slide layer')
- the 'load supporting layer' is integrally laminated to form a double structure, and the softening point of the slide layer and the load supporting layer is set to a specific range by controlling the component content of the polymer composite material of each layer.
- the dual structure bush of the present invention can be used under a wide range of temperature conditions and can be used stably under a wide range of conditions after being pressed into a boss of a housing.
- the bush of the dual structure may have a longer life than conventional metal bushes because there is no deformation in the slide layer even if unbalanced load is caused by unspecified operating conditions.
- the double-structured bush according to the present invention includes the load supporting layer formed integrally with the slide layer, thereby having excellent load resistance under operating conditions of high load, and having excellent lubrication characteristics without periodic greasing. Can be maintained continuously.
- the double-structured bush made of the polymer composite material according to the present invention is processed to a tolerance level larger than the boss inner diameter of the housing, and then is forcibly fitted into the boss of the housing by force-fitting and fixing. use. Therefore, even when using the bush of the double structure according to the present invention should be minimized deformation due to the external temperature. Particularly, in the case of the load supporting layer, since it is forcibly pressed into the boss of the housing, there should not be any deformation under the use temperature condition in order to maintain the pressing force with the housing. Since the misplacement can cause problems, it is necessary to maintain a high coefficient of friction with respect to the boss inner peripheral surface of the housing at all times.
- the softening point of the load support layer is adjusted to a range of about 250 to 400 ° C., preferably about 300 to 350 ° C. by adjusting the content of the components in the polymer composite material forming the load support layer in the manufacture of the load support layer. If the softening point of the load support layer is less than 250 ° C., the load support layer may fail to be fixed to the boss inner circumferential surface due to local deformation and friction reduction at high temperatures of 60 ° C. or higher and high load conditions of 80 MPa or more. On the other hand, if the softening point of the load supporting layer is more than 400 ° C., brittleness becomes large at a low temperature of ⁇ 40 ° C. or less, and may crack and break under impact conditions such as a hydraulic breaker.
- the slide layer is in constant contact with the pin for relative movement. Due to the relative motion of the slide layer and the fin, the interface temperature of the slide layer and the fin increases. Therefore, when the softening point of the slide layer is not designed to be above a certain level, the slide layer is pressed when the load is concentrated in a local area such as an uneven load under an unspecified working condition, which causes the slide layer to deform and wear or break. Can be.
- the softening point of the slide layer is adjusted to a range of about 120 to 180 ° C., preferably 140 to 160 ° C. by adjusting the content of components in the polymer composite material forming the slide layer when the slide layer is manufactured.
- the softening point of the slide layer is less than about 120 ° C.
- the inner circumferential surface of the slide layer may be deformed under high temperature and high load continuous use conditions of 60 ° C. or more, thereby degrading the life of the bush.
- the softening point of the slide layer is greater than about 180 ° C.
- the friction coefficient of the inner circumferential surface of the slide layer is increased, so that the wear rate of the slide layer is increased, and thus the life of the bush can be reduced.
- Bush 100 is made of a polymer composite material, is applied to the front joint of the construction machine to support the load and implement the swinging motion.
- the bush 100 has a space for accommodating the pin unit 200 therein, and moves relative to the pin unit. As shown in FIGS. 1 to 4, the bushing layer 101 and the load supporting layer 102 are moved. Include.
- the slide layer 101 is accommodated in contact with the inner peripheral surface so that the pin unit 200 can be rotatably supported.
- the slide layer 101 is a first polymer matrix; Self-lubricative material; And a first polymer composite material comprising a first fiber substrate.
- the mixing ratio of the first polymer matrix, the self-lubricating particles and the first fiber substrate is 20 to 22: 50 to 55: 23 to 30 weight ratio, preferably 20.5 to 21.5: 52 to 54: 24 to 28
- the slide layer has a softening point of about 120 to 180 ° C, preferably about 140 to 160 ° C.
- the slide layer Since the slide layer exhibits excellent elasticity and resilience, and can maintain excellent lubrication characteristics without periodic feeding, the low friction property can be maintained so that the pin unit 101 contacted with the inner circumferential surface can rotate smoothly. Can be. In addition, the slide layer is not deformed even under high temperature, high load and continuous use conditions of 60 ° C. or more, so that the life of the bush can be improved.
- the first polymer matrix may improve thermal and chemical stability of the slide layer.
- the first polymer matrix are not particularly limited, and may be an epoxy polymer, a polyurethane polymer, a polyamide polymer, a polyalphaolefin polymer, a vinyl polymer, an acrylic polymer, a polyacetal polymer, a polyether polymer, or a poly Ester polymers, polyether sulfone polymers, polysulfide polymers, polyimide polymers, polypeptide polymers, polyketone polymers, polyolefin polymers, polyimide polymers, vinylidene polymers, and copolymers thereof. These may be used alone or in combination of two or more thereof.
- the curing rate is increased during manufacturing of the bush, so productivity may be improved, and thermal stability and chemical stability of the bush may be improved.
- both polymer matrices are diffused or covalently bonded to each other at the interface between the slide layer and the load bearing layer, without using an adhesive or the like.
- the load bearing layer can be more easily integrated into the slide layer.
- the curing conditions are similar, so that each layer does not need to be cured separately, and thus the working speed can be improved.
- the first polymer composite material includes self-lubricative particles.
- Self-lubricating particles are solid particles with low frictional resistance even without a lubricant, which can give bushes low frictional properties at all times and prevent the inner circumferential surface of the slide layer from abrasion or burning during pin and relative movement. have.
- Non-limiting examples of such self-lubricating particles include Graphite, Graphite fluoride, MoS 2 , MoSe 2 , WS 2 , WSe 2 , NbS 2 , NbSe 2 , TaS, TaSe 2 , TiS 2 , TiSe 2 , TiTe 2 , CeF 3 , Ba (OH) 2 , CdCl 2 , CoCl 2 , ZrCl 2 , PbCl 2 , PbI 2 , BN, Ag 2 SO 4 , Borax (Na 2 B 4 O 7 ), Talc [Mg 3 (OH) 2 Si 2 O 10 ], Mica [KAl 2 (Si 3 Al) O 10 (OH) 2 ], ZnS, SnS 2 , FeS, CaF 2 , LiF, Zn 2 P 2 O 7 , Ca 3 (PO 4 ) 2 , Fe 2 P 2 O 7 , Ca (OH) 2 , Mg (OH) 2 , Zn
- self-lubricating particles in a resin form such as PTFE and non-resin self-lubricating particles such as graphite may be mixed and used.
- the mixing ratio of the self-lubricating particles in the form of resin and the self-lubricating particles in the form of non-resin is not particularly limited, but is 10 to 90:90 to 10 weight ratio, preferably 20 to 70:30 to 80 In the case of the weight ratio, not only the lubricating properties of the bush but also the wear resistance and the load resistance can be further improved.
- the first polymer composite material includes a first fiber base material.
- the strength of the slide layer can be improved.
- Such first fiber substrates include yarns, woven fabrics, knitting, and braids.
- the thickness of the slide layer in the bush production through filament winding method is used. Since it can be easily adjusted, workability can be improved.
- the slide layer is formed in a uniform thickness and shape, so that the slide layer is uniform throughout. May have strength.
- the material (fiber) of the first fiber base is not particularly limited, and non-limiting examples include vegetable fibers such as cotton and hemp; Animal fibers such as wool, silk, etc .; Regenerated fibers such as rayon and the like; Synthetic fibers such as polyester, acrylic, nylon, polyurethane, and the like;
- inorganic fibers such as glass fibers and carbon fibers, metal fibers and the like, which may be used alone or in combination of two or more thereof.
- inorganic fibers such as glass fibers and carbon fibers, metal fibers and the like, which may be used alone or in combination of two or more thereof.
- the moisture content is low, so that pores in the bush are not formed during the subsequent curing, and the thermal stability is also excellent.
- the strength and thermal stability of the final bush can be improved.
- the first polymer composite material may further include additives such as an initiator, a diluent, and the like to further improve the physical properties of the slide layer, as necessary, within the range of not impairing the lubrication characteristics of the slide layer. .
- the initiator is appropriately selected according to the type of the first polymer matrix, for example, Benzo phenone initiator, thioxantone initiator, a-hydroxyketone initiator, a-amino ketone initiator, benzyl dimethyl ketal (BDK) ), phenyl glyoxylate type, acyl phosphine oxide type, etc., but is not limited thereto.
- the diluents include Butyl Glycidyl Ether (BGE), Phenyl Glycidyl Ether (PGE), Aliphatic Glycidyl Ether (C12-C14), Modifide-Tert-Carboxylic Dlycidyl Ester, DiButylPhthalate (DBP), DiOctylPhthalate (DOP), Nonyl-Phenol, etc. There is, but is not limited to this.
- an extremely small amount of additives such as an antifoaming agent, a viscosity adjusting agent, a wetting agent, a glossing agent, and the like may be included.
- the content of the initiator, diluent and other additives is not particularly limited, and may be about 1 to 10 parts by weight based on 100 parts by weight of the first polymer matrix, respectively.
- the bush 100 includes a load supporting layer 102 integrally stacked on the slide layer 101 so as to surround the outer circumferential surface of the slide layer 101.
- the load supporting layer 102 may be in contact with the inner circumferential surface of the boss 300 to support the radial load of the pin unit 200.
- This load bearing layer 102 is formed of a second polymer composite material comprising a second polymer matrix and a second fiber substrate.
- the load supporting layer is about 250 It has a softening point in the range from to 400 ° C., preferably in the range from about 300 to 350 ° C.
- the load supporting layer minimizes deformation under the use temperature conditions and maintains a high coefficient of friction at all times with respect to the boss inner circumferential surface of the housing.
- the load supporting layer may not only compensate the load resistance of the slide layer, but also have excellent elasticity and recovery property even when a lateral load is generated by the pin unit when contacting the inner circumferential surface of the boss, thereby improving wear resistance and impact resistance.
- the life characteristics can be improved.
- the second polymer matrix may improve thermal and chemical stability of the load bearing layer.
- a second polymer matrix is an epoxy polymer, a polyurethane polymer, a polyamide polymer, a polyalphaolefin polymer, a vinyl polymer, an acrylic polymer, a polyacetal polymer, a polyether polymer, a polyester Polymers, polyether sulfone polymers, polysulfide polymers, polyimide polymers, polypeptide polymers, polyketone polymers, polyolefin polymers, polyimide polymers, vinylidene polymers, and copolymers thereof. It may be used alone or in combination of two or more.
- the curing rate is increased during manufacturing of the bush, so productivity may be improved, and thermal stability and chemical stability of the bush may be improved.
- the second polymer matrix of the load support layer is introduced into the surface of the slide layer at the interface between the slide layer and the load support layer.
- the second polymer composite material includes a second fiber substrate.
- the second fibrous substrate improves the strength of the load bearing layer to compensate for the load resistance of the slide layer.
- Such second fiber substrates include yarns, woven fabrics, knitting, braids, and the like, like the first fiber substrates.
- the workability can be improved because the thickness of the load supporting layer can be easily adjusted during the manufacture of the bush through the filament winding method, and the fabric can be knitted even when the fabric is wound on the mandrel or the slide layer.
- shear deformation is not easy and is formed in the same thickness and shape, so that the load supporting layer can have a uniform strength as a whole.
- the second fiber base material (fiber) is not particularly limited, and non-limiting examples include vegetable fibers such as cotton and hemp; Animal fibers such as wool, silk, etc .; Regenerated fibers such as rayon and the like; Synthetic fibers such as polyester, acrylic, nylon, polyurethane, and the like;
- inorganic fibers such as glass fibers and carbon fibers, metal fibers and the like, which may be used alone or in combination of two or more thereof.
- inorganic fibers such as glass fibers and carbon fibers, metal fibers and the like, which may be used alone or in combination of two or more thereof.
- the moisture content is low, so that pores in the bush are not formed during the subsequent curing, and the thermal stability is also excellent.
- the strength and thermal stability of the final bush can be improved.
- the second polymer composite material in addition to the above-described components, in order to further improve the physical properties of the load support layer, if necessary, within the range that does not impair the characteristics such as the load resistance of the load support layer, additives such as initiators, dispersants, antifoaming agents, etc. It may further include.
- the initiator is appropriately selected according to the type of the second polymer matrix, for example, Benzo phenone initiator, thioxantone initiator, a-hydroxyketone initiator, a-amino ketone initiator, benzyl dimethyl ketal (BDK) ), phenyl glyoxylate type, acyl phosphine oxide type, etc., but is not limited thereto.
- the content of such an initiator is not particularly limited and may be about 1 to 10 parts by weight based on 100 parts by weight of the second polymer matrix.
- the double-structured bush made of a polymer composite material has a surface pressure of 2 to 6 kgf / mm 2 because the seizure cycle is 250,000 cycles or more and the indentation holding limit surface pressure at 60 ° C. is 90 to 100 MPa. And a sliding speed condition of 0.25 to 3.5 cm / sec.
- the double-structured bush according to the present invention can be manufactured through various methods.
- the dual structure bush comprises a first polymer matrix, self-lubricating particles, and a first fiber substrate, wherein the softening point of the slide layer is 120-180 ° C., so that the first polymer matrix, self-lubricating particles, 1 forming a first polymer composite material by adjusting the use ratio of the fibrous substrate; Forming a second polymer composite material comprising a second polymer matrix and a second fiber substrate, wherein adjusting the use ratio of the second polymer matrix and the second fiber substrate such that the softening point of the load supporting layer is about 250 to 400 ° C .; Winding the first polymeric composite material on a mandrel to form a slide layer of a desired thickness; Winding the second polymer composite material wound on the first polymer composite material such that a load bearing layer having a desired thickness is formed; And it can be produced through a method comprising the step of curing the wound first polymer composite material and the second polymer composite material.
- the method may further comprise the step of cutting according to the shape of the final bush. Further, after the hardening step, the method may further include machining the inner circumferential surface of the slide layer of the final bush and / or the outer circumferential surface of the load supporting layer.
- the dual structure bush includes a first polymer matrix, self-lubricating particles, and a first fiber substrate, wherein the softening point of the slide layer is 120 to 180 ° C., and Adjusting the percentage of use of the first fibrous substrate to form a first polymeric composite material; Forming a second polymer composite material comprising a second polymer matrix and a second fiber substrate, wherein adjusting the use ratio of the second polymer matrix and the second fiber substrate such that the softening point of the load supporting layer is about 250 to 400 ° C .; Winding the first polymeric composite material on a mandrel to form a slide layer of a desired thickness; Curing the first polymer composite material wound on the mandrel to form a slide layer; Winding the second polymer composite material onto the slide layer to form a load bearing layer of a desired thickness; And curing the wound second polymer composite material to form a load bearing layer.
- the method may further include cutting according to the shape of the final bush. Further, after the forming of the load supporting layer, the method may further include machining the inner circumferential surface of the slide layer of the final bush and / or the outer circumferential surface of the load supporting layer.
- a first polymer composite material including a first polymer matrix, self-lubricating particles, and a first fiber substrate is formed (S100).
- the step S100 is a step of forming a resin composition by adding self-lubricating particles to the first polymer matrix; Weaving the first fibrous substrate using fibers; And impregnating the woven first fiber substrate into the resin composition.
- the use ratio of the first polymer matrix, the self-lubricating particles, and the first fiber substrate is adjusted so that the softening point of the slide layer formed of the first polymer composite material is in the range of about 120 to 180 ° C.
- the type of fiber, the thickness of the yarn, etc. it is appropriate to adjust the type of fiber, the thickness of the yarn, etc. according to the strength, elastic modulus, fatigue life, thickness, etc. of the final slide layer.
- a second polymer composite material including the second polymer matrix and the second fiber base material is formed (S200).
- the step S200 is a step of weaving a second fiber substrate using the fiber; And impregnating the woven second fibrous substrate into the second polymer matrix.
- the use ratio of the first polymer matrix, the self-lubricating particles, and the first fiber substrate is adjusted so that the softening point of the slide layer formed of the first polymer composite material is in the range of about 120 to 180 ° C.
- the type of fiber, the thickness of the yarn, and the like are appropriately adjusted in consideration of the thickness, strength, elastic modulus, fatigue life, and the like of the final load supporting layer.
- step S100 the first polymer composite material formed in step S100 is wound around the mandrel to form a slide layer 101 (S300).
- the number of times of winding the first polymer composite material on the mandrel and the winding angle are adjusted so that the thickness ratio of the slide layer to the load supporting layer is 0.15 to 0.67.
- the said curing temperature and time are not specifically limited, It is preferable to adjust, taking into consideration the kind of initiator, the kind of 1st polymer matrix, the kind of 1st fiber base material, the thickness of the 1st polymer composite material, and the number of windings.
- the first polymer composite material may be cured by heating at about 130 ° C. to 150 ° C. for about 10 to 30 minutes. At this time, shrinkage can be minimized and the strength can be improved by post-curing under the above temperature conditions semi-cured at room temperature for about one day.
- the second polymer composite material formed in step S200 is wound around the slide layer formed in step S300 to form a load supporting layer (S400).
- the number of layers (layers) of the first polymer composite material wound so that the ratio of the thickness of the slide layer to the load supporting layer is 0.15 to 0.67
- the number of times of winding the second polymer composite material to the slide layer one layer Adjust above
- the winding angle when the second high polymer composite material is wound is adjusted in consideration of the desired strength of the load supporting layer.
- the wound first polymer composite material and the second polymer composite material are cured (S500). Thereby, a double-structured bush made of a polymer composite material including a slide layer 101 and a load bearing layer 102 integrally laminated on the outer circumferential surface of the slide layer is obtained.
- the curing temperature and time are not particularly limited, and similarly to the first polymer composite material, the kind of initiator, the kind of first and second polymer matrices, the kind of first and second fiber substrates, and the first and second polymer composites It is preferable to adjust in consideration of the thickness of the material and the number of turns.
- the first polymer composite material and the second polymer composite material may be cured by heating at about 130 to 150 ° C. for about 10 to 30 minutes.
- the second polymer composite material is cured by adjusting the curing temperature and time so that the slide layer which is already cured and formed is not deteriorated.
- the bush obtained after the step S500 can be cut according to the desired length.
- the inner circumferential surface of the slide layer of the bush obtained after the step S500 may be machined to an appropriate tolerance level to smoothly rotate the pin unit 200.
- the bush of the present invention can be fixed so that there is no rotation between the operation after the press-fit to the inner peripheral surface of the boss (300).
- the present invention provides a bearing assembly (not shown) having a bush 200 of the dual structure described above.
- the bearing assembly for example, the pin unit 200 may be inserted into an inner circumferential surface of the bush 200 having a dual structure.
- the fabric woven with polyester fibers was impregnated with a resin composition containing epoxy resin, graphite and poly tetrafluoro ethylene particles to obtain a first polymer composite material, which was then mandrel (diameter: 71 mm). The slide layer was wound around the surface of). At this time, the mixing ratio of the epoxy resin, PTFE particles, graphite and polyester fiber fabric of the first polymer composite material was adjusted to a weight ratio of 22: 22: 33: 23.
- the fabric woven with glass fibers was impregnated with an epoxy resin to obtain a second polymer composite material, which was then wound on a slide layer formed on the surface of the mandrel to form a load supporting layer, and then heat-cured to form a bush having a double structure. : 71 mm, outer diameter: 86 mm, length: 60 mm).
- the mixing ratio of the epoxy resin and the glass fiber fabric of the second polymer composite material was adjusted to a weight ratio of 21.3: 78.7.
- the mixing ratio of the epoxy resin, the PTFE particles, the graphite and the polyester fiber fabric of the first polymer composite material used in Example 1 was replaced by the weight ratio of 21.5: 21.5: 32.3: 24.7 instead of the weight ratio of 22: 22: 33: 23.
- the double structure was carried out in the same manner as in Example 1, except that the mixing ratio of the epoxy resin and the glass fiber fabric of the second polymer composite material was adjusted to the weight ratio of 20.8: 79.2 instead of the weight ratio of 21.3: 78.7. Got a bush.
- the mixing ratio of the epoxy resin, PTFE particles, graphite and polyester fiber fabric of the first polymer composite material used in Example 1 was replaced by the weight ratio of 20.8: 20.8: 31.25: 27.15 instead of the weight ratio of 22: 22: 33: 23.
- the double structure was carried out in the same manner as in Example 1 except that the mixing ratio of the epoxy resin and the glass fiber fabric of the second polymer composite material was adjusted to the weight ratio of 20.4: 79.6 instead of the weight ratio of 21.3: 78.7. Got a bush.
- the mixing ratio of the epoxy resin, the PTFE particles, the graphite and the polyester fiber fabric of the first polymer composite material used in Example 1 was replaced by the weight ratio of 20: 20: 30: 30 instead of the weight ratio of 22: 22: 33: 23.
- the double structure was carried out in the same manner as in Example 1, except that the mixing ratio of the epoxy resin and the glass fiber fabric of the second polymer composite material was adjusted to the weight ratio of 20:80 instead of the weight ratio of 21.3: 78.7. Got a bush.
- a bush made of structural carbon steel whose surface was subjected to salt bathing and MoS 2 soft coating was used as Comparative Example 1.
- the mixing ratio of the epoxy resin, the PTFE particles, the graphite and the polyester fiber fabric of the first polymer composite material used in Example 1 was replaced by the weight ratio of 24.4: 24.4: 36.6: 14.6 instead of the weight ratio of 22: 22: 33: 23.
- the double structure was carried out in the same manner as in Example 1, except that the mixing ratio of the epoxy resin and the glass fiber fabric of the second polymer composite material was adjusted to the weight ratio of 22.2: 77.8 instead of the weight ratio of 21.3: 78.7. Got a bush.
- the mixing ratio of the epoxy resin, PTFE particles, graphite and polyester fiber fabric of the first polymer composite material used in Example 1 was replaced by a weight ratio of 23.5: 23.5: 35.3: 17.7 instead of a weight ratio of 22: 22: 33: 23.
- the double structure was carried out in the same manner as in Example 1, except that the mixing ratio of the epoxy resin and the glass fiber fabric of the second polymer composite material was adjusted to the weight ratio of 22:78 instead of the weight ratio of 21.3: 78.7. Got a bush.
- the mixing ratio of the epoxy resin, the PTFE particles, the graphite and the polyester fiber fabric of the first polymer composite material used in Example 1 was replaced by the weight ratio of 22.2: 22.2: 33.4: 22.2 instead of the weight ratio of 22: 22: 33: 23.
- the double structure was carried out in the same manner as in Example 1, except that the mixing ratio of the epoxy resin and the glass fiber fabric of the second polymer composite material was adjusted to a weight ratio of 21.5: 78.5 instead of a weight ratio of 21.3: 78.7. Got a bush.
- the mixing ratio of the epoxy resin, the PTFE particles, the graphite, and the polyester fiber fabric of the first polymer composite material used in Example 1 was replaced by the weight ratio of 19.4: 19.4: 29.1: 32.1 instead of the weight ratio of 22: 22: 33: 23.
- the double structure was carried out in the same manner as in Example 1, except that the mixing ratio of the epoxy resin and the glass fiber fabric of the second polymer composite material was adjusted to the weight ratio of 19: 81 instead of the weight ratio of 21.3: 78.7. Got a bush.
- Each bush is heated to 120 ° C / hr with a 50 N load applied with a clamp (length: 3 mm, cross-sectional area: 1.000 ⁇ 0.015 mm 2 ), so that the end of the clamp is in the bush at the position at the start of the test.
- the temperature at the time of invasion was measured.
- T b represents the softening point of the load bearing layer
- T s represents the softening point of the slide layer.
- each bush was pressed into the boss of the housing and the shrinkage of the bush inner diameter was measured by comparing the inner diameter of the shrunk bush with the inner diameter of the bush before pressing. At this time, the shrinkage amount of the bush inner diameter is referred to as the clamping amount.
- the friction coefficient was measured in an endless repeated test under an inert atmosphere, a temperature of -40 ° C, a rocking angle of 90 °, a rocking speed of 1 m / min, and an infinite loop load of 1 to 21 tons.
- the first cycle to be defined as a seizure cycle, tested until the seizure cycle, and confirmed whether the bush breaks.
- Example 1 250 120 0.2 90 0.05 261,000 X
- Example 2 300 140 0.2 95 0.05 321,000 X
- Example 3 350 160 0.2 95 0.07 309,000 X
- Example 4 400 180 0.2 100 0.08 275,000 X Comparative Example 1 - - 0.2 100 0.08 165,000 X Comparative Example 2 - - 0.2 95 0.08 250,000 X Comparative Example 3 100 60 0.2 60 0.05 58,000 X Comparative Example 4 150 80 0.2 75 0.05 116,000 X Comparative Example 5 200 100 0.2 80 0.05 202,000 X Comparative Example 6 450 200 0.2 100 0.08 222,000 O
- the bushes of Examples 1 to 4 in which the softening point of the load support layer was adjusted to 250 to 400 ° C., and the softening point of the slide layer was adjusted to 120 to 180 ° C., the indentation holding limit surface pressure at 60 ° C.
- the Seizure cycle was 260,000 cycles higher than the bushes of Comparative Examples 1 and 2, in the extent of the bushes of Comparative Examples 1 and 2.
- the softening point of the load support layer is adjusted to 300 to 350 °C
- the bush of Examples 2 and 3 the softening point of the slide layer is adjusted to about 140 to 160 °C was very high Seizure cycle of more than 300,000 cycles.
- the bushes of Examples 1 to 4 have a softening point of the load support layer outside the range of 250 to 400 ° C., or a softening point of the slide layer outside the range of 120 to 180 ° C.
- the indentation holding limit surface pressure and Seizure cycle at 60 °C were excellent, and the bush did not break even after low temperature test at-40 °C.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
| Tb(℃) | Ts(℃) | 죔쇄량(mm) | 압입 유지 한계 면압(MPa)(60 ℃) | 마찰계수 | Seizurecycle | 저온시험 후 파손 여부(- 40 ℃) | |
| 실시예 1 | 250 | 120 | 0.2 | 90 | 0.05 | 261,000 | X |
| 실시예 2 | 300 | 140 | 0.2 | 95 | 0.05 | 321,000 | X |
| 실시예 3 | 350 | 160 | 0.2 | 95 | 0.07 | 309,000 | X |
| 실시예 4 | 400 | 180 | 0.2 | 100 | 0.08 | 275,000 | X |
| 비교예 1 | - | - | 0.2 | 100 | 0.08 | 165,000 | X |
| 비교예 2 | - | - | 0.2 | 95 | 0.08 | 250,000 | X |
| 비교예 3 | 100 | 60 | 0.2 | 60 | 0.05 | 58,000 | X |
| 비교예 4 | 150 | 80 | 0.2 | 75 | 0.05 | 116,000 | X |
| 비교예 5 | 200 | 100 | 0.2 | 80 | 0.05 | 202,000 | X |
| 비교예 6 | 450 | 200 | 0.2 | 100 | 0.08 | 222,000 | O |
Claims (6)
- 핀 유닛이 회전 지지 가능하도록 내주면에 접촉 수용하는 슬라이드층; 및상기 슬라이드층의 외주면을 둘러싸도록 일체로 적층되고, 보스의 내주면에 접촉 수용되어 핀 유닛의 반경 방향 하중을 지지하는 하중 지지층을 포함하되,상기 하중 지지층의 연화점이 250 내지 400 ℃이고, 상기 슬라이딩층의 연화점이 120 내지 180 ℃이며, 고분자 복합 재료로 형성된 이중 구조의 부시.
- 제1항에 있어서,상기 하중 지지층의 연화점이 300 내지 350 ℃이고,상기 슬라이딩층의 연화점이 140 내지 160 ℃인 고분자 복합 재료로 형성된 이중 구조의 부시.
- 제1항에 있어서,상기 슬라이드층은 (a) 제1 고분자 매트릭스; (b) 자기 윤활성 입자(self-lubricative material); 및 (c) 제1 섬유 기재를 포함하는 제1 고분자 복합재료로 형성된 것이 특징인 이중 구조의 부시.
- 제1항에 있어서,상기 하중 지지층은 (a) 제2 고분자 매트릭스, 및 (b) 제2 섬유 기재를 포함하는 제2 고분자 복합재료로 형성된 것이 특징인 이중 구조의 부시.
- 제1항에 있어서,2 내지 6 kgf/㎟ 의 면압 및 0.25 내지 5 cm/sec 의 접동속도 조건에서 사용되는 것이 특징인 이중 구조의 부시.
- 제1항 내지 제5항 중 어느 한 항에 기재된 이중 구조의 부시를 구비하는 베어링 조립체.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14/769,191 US9618040B2 (en) | 2013-02-20 | 2013-10-18 | Double-structure bush and bearing assembly comprising same |
| CN201380073548.2A CN105074244B (zh) | 2013-02-20 | 2013-10-18 | 双重结构的衬套及具备其的轴承组装体 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2013-0018217 | 2013-02-20 | ||
| KR1020130018217A KR20140104628A (ko) | 2013-02-20 | 2013-02-20 | 이중 구조의 부시 및 이를 구비하는 베어링 조립체 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014129719A1 true WO2014129719A1 (ko) | 2014-08-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2013/009324 Ceased WO2014129719A1 (ko) | 2013-02-20 | 2013-10-18 | 이중 구조의 부시 및 이를 구비하는 베어링 조립체 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US9618040B2 (ko) |
| KR (1) | KR20140104628A (ko) |
| CN (1) | CN105074244B (ko) |
| WO (1) | WO2014129719A1 (ko) |
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- 2013-10-18 US US14/769,191 patent/US9618040B2/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| US20150377287A1 (en) | 2015-12-31 |
| CN105074244B (zh) | 2018-02-16 |
| US9618040B2 (en) | 2017-04-11 |
| KR20140104628A (ko) | 2014-08-29 |
| CN105074244A (zh) | 2015-11-18 |
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