CN1961162A - Grease for sliding bearing - Google Patents
Grease for sliding bearing Download PDFInfo
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- CN1961162A CN1961162A CNA2005800178696A CN200580017869A CN1961162A CN 1961162 A CN1961162 A CN 1961162A CN A2005800178696 A CNA2005800178696 A CN A2005800178696A CN 200580017869 A CN200580017869 A CN 200580017869A CN 1961162 A CN1961162 A CN 1961162A
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- sliding bearing
- grease
- oil
- axle
- lubricant
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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
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/102—Construction relative to lubrication with grease as lubricant
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
- Lubricants (AREA)
Abstract
The invention provides a grease for a sliding bearing capable of suppressing noise resulting from a slippages between a shaft and the bearing in stopping a machine. The grease (24) for the sliding bearing is supplied between the sliding bearing (16) formed of a porous sintered alloy bush having a lubricating oil (31) impregnated in the pores (30) thereof and the shaft (22) inserted into the sliding bearing (16) and rotatingly slidably supported thereon in the circumferential direction. The grease is characterized in that it uses a base oil having a dynamic viscosity at 40 DEG C of 10 to 70 mm<2>/s and oozed by the load of the shaft (22) to form an oil film (35) between the sliding bearing (16) and the shaft (22).
Description
Technical field
The present invention relates to a kind of lubricating grease that is used for containing the sliding bearing that the porous sintered alloy lining that is soaked with lubricant oil constitutes by pore.
Background technique
At present, be in the various machineries of representative with building machinery, building machinery, Transport Machinery, hoist, lathe, automobile etc., sometimes use slide bearing assembly, this assembly has sliding bearing and inserts in this bearing and be supported by it and the axle of rotational slide along the circumferential direction.For example, excavating gear as the hydraulic shovel of building machinery typical example, have with runner on the upper rotating body shear leg (boom), the dipper (arm) that is connected with this shear leg front end, the scraper bowl (bucket) that is connected with the front end of this dipper in addition that link to each other.At the hinge portion of above-mentioned shear leg, dipper, scraper bowl, generally all use slide bearing assembly, this assembly has the sliding bearing that supports the axle that becomes rotating fulcrum.
Comprise in this kind slide bearing assembly and use the assembly of oil-containing sintered alloy lining as bearing, described oil-containing sintered alloy lining is by the full-bodied lubricant oil of polyliner impregnation that is made of iron class sintered alloy is obtained.The frictional heat that produces when this oil-containing sintered alloy lining slides in lining by axle expands the lubricant oil of impregnation, and lowering viscousity forms thin oil film thereby make lubricant oil be exuded to slip surface simultaneously, the excellent self-lubrication function of performance (referring to patent documentation 1 etc.).
Patent documentation 1: the spy opens flat 8-105444 communique
Summary of the invention
For example, when the excavating gear of the hydraulic shovel in stopping to be placed with the state of scraper bowl built on stilts, because the deadweight of excavating gear, moment loading was in the periphery of the axle of slide bearing assembly.The confining force of the oil hydraulic cylinder of excavating gear desire by driving each articulated section is kept posture, but owing to press the trace of oil to sew, makes that the cylinder internal drop is low, and the power of As time goes on resisting excavating gear whereabouts moment reduces, and slides between axle and the bearing.
Therefore at this moment, because the surface of oil-containing sintered alloy lining and generally be in " running-in state " as the surface of contact between the surface of the axle of corresponding parts is compared with the situation of using general iron lining, the real contact area between axle and the bearing is very big.But, become big owing to be in contact with one another the adhesive force that acts on when area increases between two solids, therefore the virtual friction power between non-when lubricated when static () oil-containing sintered alloy lining and axle has the tendency of increase.The result since the energy that discharges when take place sliding in the oil-containing sintered alloy lining increase, therefore, the vibration that produces in the slide bearing assembly also increases, and with regard to above-mentioned example, this vibration also may correspondingly become big with the abnormal sound of other parts generation resonance generations of for example excavating gear.Though this kind abnormal sound does not influence the reliability of machinery, cause bad psychological impact or uncomfortable feeling may near staff or citizen.
The objective of the invention is to, provide a kind of and can suppress because machinery slide grease for sliding bearing of the abnormal sound that causes of axle and bearing when stopping.
(1) for achieving the above object, the invention provides a kind of grease for sliding bearing, described lubricating grease is supplied to by containing the sliding bearing that the porous sintered alloy lining that is soaked with lubricant oil constitutes in the pore and inserting among the described sliding bearing and with between the supported axle of the mode of rotational slide along the circumferential direction, it is characterized by: using 40 ℃ of following kinetic viscosities is 10～70mm
2/ s, at the base oil that oozes out and between described sliding bearing and described axle, form oil film under the load effect of described axle.
(2) for achieving the above object, the present invention also provides a kind of grease for sliding bearing, described lubricating grease has been supplied to by impregnation in the pore sliding bearing that the porous sintered alloy lining of the lubricant oil that is mixed with solid lubricant constitutes and has inserted among the described sliding bearing and with between the supported axle of the mode of rotational slide along the circumferential direction, it is characterized by: using 40 ℃ of following kinetic viscosities is 10～70mm
2/ s, at the base oil that oozes out and between described sliding bearing and described axle, form oil film under the load effect of described axle.
(3) for achieving the above object, the present invention also provides a kind of grease for sliding bearing, described lubricating grease is supplied to by containing the sliding bearing that the porous sintered alloy lining that is soaked with lubricant oil constitutes in the pore and inserting among the described sliding bearing and with between the supported axle of the mode of rotational slide along the circumferential direction, it is characterized by: use kinetic viscosity lower than described lubricant oil, at the base oil that oozes out and between described sliding bearing and described axle, form oil film under the load effect of described axle.
(4) for achieving the above object, the present invention also provides a kind of grease for sliding bearing, described lubricating grease is supplied to by containing the sliding bearing that the porous sintered alloy lining that is soaked with lubricant oil constitutes in the pore and inserting among the described sliding bearing and with between the supported axle of the mode of rotational slide along the circumferential direction, it is characterized by: use base oil, and adding solid lubricant at least, described base oil is 10～70mm 40 ℃ of following kinetic viscosities
2/ s oozes out under the load effect of described axle, forms oil film between described sliding bearing and described axle.
(5) for achieving the above object, the present invention also provides a kind of grease for sliding bearing, described lubricating grease is supplied to by containing the sliding bearing that the porous sintered alloy lining that is soaked with lubricant oil constitutes in the pore and inserting among the described sliding bearing and with between the supported axle of the mode of rotational slide along the circumferential direction, it is characterized by: use base oil, and add solid lubricant at least, the kinetic viscosity of described base oil is lower than described lubricant oil, under the load effect of described axle, ooze out, between described sliding bearing and described axle, form oil film.
(6) in above-mentioned (2), (4) or (5), preferred above-mentioned solid lubricant contains at least a kind in organic-molybdenum, molybdenum disulfide, tungsten disulfide, boron nitride, graphite, nylon, polyethylene, polyimide, polyoxymethylene, teflon, the polyphenylene sulfide.
(7) in each of above-mentioned (1)～(5), also preferred extreme pressure agent and the oiliness improver of adding.
According to the present invention, even at sliding bearing and axle during relative stopping, also because the low viscosity base oil that oozes out from grease for sliding bearing forms oil film between sliding bearing and axle, therefore, this oil film becomes lubricating film, can reduce the frictional force between sliding bearing and the axle, suppress the abnormal sound that abnormal sound produced or reduced generation.
Description of drawings
[Fig. 1] is suitable for the integrally-built profile of the hydraulic shovel of one of the machinery of grease for sliding bearing of the present invention example for expression.
[Fig. 2] is the sectional view of the internal structure of the slide bearing assembly of the grease for sliding bearing of suitable the present invention's the 1st embodiment of expression.
[Fig. 3] amplifies the partial cross section figure that represents the near interface between sliding bearing and the axle for medelling ground, and described sliding bearing is suitable for the grease for sliding bearing of the present invention's the 1st embodiment.
The sliding bearing of the state of the oil film that [Fig. 4] oozes out from grease for sliding bearing of the present invention for medelling ground expression and the sectional view of axle.
[Fig. 5] is suitable for the integrally-built profile of the hydraulic shovel of one of the machinery of grease for sliding bearing of the present invention example for expression, be the figure of expression scraper bowl outstanding state from ground.
[Fig. 6] amplifies the partial cross section figure that represents the near interface between sliding bearing and the axle for medelling ground, and described sliding bearing is suitable for the grease for sliding bearing of the present invention's the 2nd embodiment.
[Fig. 7] is the table of the comparative result of the composition of expression grease for sliding bearing of the present invention and commercially available lubricating grease and performance test.
[Fig. 8] is the Determination of Friction Coefficient result's of expression grease for sliding bearing of the present invention and commercially available lubricating grease figure.
Symbol description
16 sliding bearings
22
24 grease for sliding bearing
30 pores
31 lubricant oil
33 solid lubricants
35 oil films
Embodiment
Below, by description of drawings embodiment of the present invention.
Fig. 1 is suitable for the integrally-built profile of the hydraulic shovel of one of the machinery of grease for sliding bearing of the present invention example for expression.
The hydraulic shovel that Fig. 1 represents is equipped with: lower running body 1 and rotatably carry the upper rotating body 2 on this lower running body 1 and be arranged on this upper rotating body 2 a side (among Fig. 1 for left side) operator cabin 3 and be arranged on upper rotating body 2 opposite side (being the right side among Fig. 1) engine compartment 4 and be arranged on the excavating gear 5 of operator cabin 3 one sides on the upper rotating body 2.
Above-mentioned excavating gear 5 is equipped with: be arranged on the above-mentioned solid of rotation 2 can pitching movement shear leg 6 and the being used to shear leg that makes these shear leg 6 pitching movements with oil hydraulic cylinder 7 be arranged on the dipper 8 that shear leg 6 front ends can rotate and be used to make dipper that this dipper 8 rotates with oil hydraulic cylinder 9 be arranged on the scraper bowl 10 that dipper 8 front ends can rotate and be used to scraper bowl usefulness oil hydraulic cylinder 11 that this scraper bowl 10 is rotated.
As the shear leg 6 of the component parts of above-mentioned equipment 5, dipper 8, scraper bowl 10, and each oil hydraulic cylinder 7,9,11 can connect rotationally mutually by slide bearing assembly 12.In fact each slide bearing assembly that is used for equipment 5 is according to being provided with difference to some extent such as its size of place or shape, but its structure is roughly the same respectively.
Fig. 2 is the sectional view of the internal structure of the slide bearing assembly of the grease for sliding bearing of suitable the present invention's the 1st embodiment of expression.
The slide bearing assembly 12 that Fig. 2 represents is equipped with: axle sleeve 15 and by cooperating the sliding bearing 16 that is made of porous sintered alloy lining that is fixed on these axle sleeve 15 inside by shrinkage fit such as shrink fit or shrink-fit and inserting in this sliding bearing 16 and with the supported axle 22 of the mode of rotational slide along the circumferential direction.
In the both sides of sliding bearing 16, the dust ring (dustseal) 18,18 towards sliding bearing 16 both ends of the surface is set, be pressed in the axle sleeve 15.In addition, at axle sleeve 15 both sides configuration support 19,19, difference holding shim (shim) 20,20 between two end surfaces of this support 19,19 and axle sleeve 15.The gap of support 19,19 and axle sleeve 15 seals by the O shape ring 21,21 that is equipped in its outer circumferential side.Above-mentioned axle 22 runs through support 19, pad 20, dust ring 18, sliding bearing 16, by rotation fastening bolt 23 fastening supports 19.
On axle 22, be provided with from the opposite side that is equipped with rotation fastening bolt 23 1 sides and supply with the lubricating grease of grease for sliding bearing 24 to fat hole 25 to the roughly intermediate portion of sliding bearing 16.Decide sealing bolt 26 for an end spiral shell in fat hole 25 at lubricating grease, be filled into lubricating grease to the grease for sliding bearing 24 in the fat hole 25 by sealing bolt 26 sealings.By said structure, supply between sliding bearing 16 and the axle 22 for the grease for sliding bearing 24 in the fat hole 25 with being filled into lubricating grease.
Above-mentioned sliding bearing 16 is for example made by the complex sintered alloy of porous that copper powder and iron powder constitute, and has a plurality of pores.The lubricant oil of impregnation high viscosity in these pores, sliding bearing 16 is during with axle 22 slide relative, even under the effect of self-lubrication function, do not supply with grease for sliding bearing 24, also can give full play to spools 22 between lubrication effect.The for example preferred about 5～30[volume % of the porosity of sliding bearing 16].The porosity is lower than 5[volume %] time can not the impregnation q.s lubricant oil, might be not insufficient as the function of giving the fat bearing.On the other hand, the porosity surpasses 30[volume %] time, the mechanical strength of sliding bearing 16 reduces.In addition, the complex sintered alloy that is made of other raw materials except that copper powder or iron powder also can be used as the material use of sliding bearing 16.
Use kinetic viscosity than higher high viscosity substance in the sliding bearing 16 in the lubricant oil of impregnation.The frictional heat that produces when sliding in sliding bearing 16 by axle 22 expands lubricant oil, and lowering viscousity is exuded to the slip surface between axle 22 and the sliding bearing 16 thus, forms thin oil film.After the use,, under the wicking effect, get back to once more in the pore of sliding bearing 16 along with temperature descends and shrinks.Sliding bearing 16 is according to the excellent self-lubrication function of characteristic performance of above-mentioned lubricant oil.The kinetic viscosity of the lubricant oil of impregnation is specific limited not, but the range of viscosities that meets following requirement is necessary, promptly, being prerequisite by sliding bearing 16 impregnations, after the impregnation, under general state, can rest on pore inside, and when using and the frictional heat effect of 22 on axle under be exuded to slip surface after, can get back to once more in the sliding bearing 16 along with temperature reduces.Illustrate the kinetic viscosity scope of lubricant oil, for example so long as 25.5[℃] descend the kinetic viscosity value to be about 56～1500[mm
2/ s] lubricating grease, just confirm to have above-mentioned characteristic.But, for example 25.5[℃] down the value of kinetic viscosity be 220[mm
2/ s] when following, the standard surface pressure 70[Mpa relevant with the construction Machines bearing] drop to 40[Mpa] situation under, therefore visible sometimes sliding bearing 16 scorifications, are implemented more preferably to use 25.5[℃ when of the present invention] value of time kinetic viscosity is about 220～1500[mm
2/ s] lubricant oil.
In addition, contain the lubricant oil that is immersed in the sliding bearing 16, can use to comprise mineral oil or synthetic wet goods all commercially available lubricant oil usually,, its composition is not had special restriction as long as can show above-mentioned characteristic.But, can not contain and be immersed in the sliding bearing 16 owing to contain the lubricating grease of cellulosic water-thickening agent etc., therefore be excluded.
In addition, in the present embodiment, contain the lubricant oil that is immersed in the sliding bearing 16 and can contain solid lubricant.The solid lubricant that contains in the oiling agent is a stratiform structure, slides by edgewise and brings into play excellent lubrication effect.Contain at least a in for example organic-molybdenum, molybdenum disulfide, tungsten disulfide, boron nitride, graphite, nylon, polyethylene, polyimide, polyoxymethylene, teflon, the polyphenylene sulfide in the solid lubricant.The content of solid lubricant for example is about 2.0～30[quality % in the lubricant oil], the particle diameter of its solid lubrication particulate should be fully little of the degree of not blocking pore, makes the pore (for example about 0.1 μ m～100 μ m) of its sliding bearing 16 of can successfully coming in and going out.
Be immersed in the sliding bearing 16 for the lubricant oil that contains solid lubricant is contained, at first particulate solid lubricant and lubricant oil stirred fully, solid lubricant is disperseed in lubricant oil equably after, heating lubricant oil reduces and liquid stateization its viscosity.Dipping sliding bearing 16 in the lubricant oil of liquid stateization is placed under vacuum then.Thus, the air in the pore of sucking-off sliding bearing 16, the lubricant oil that contains solid lubricant replaces air to be inhaled in the pore.Make thus in the pore after the soaking by lubricating oil, take out sliding bearing 16 and place air, be cooled to room temperature, lubricant oil returns to original viscosity once more in the pore of sliding bearing 16, loses flowability.Be immersed in the sliding bearing 16 thereby the lubricant oil that contains solid lubricant is contained, and rest in its pore.
Lubricant oil heating-up temperature when lubricant oil being contained be immersed in the sliding bearing 16 does not have special qualification, can change according to used oil body, can be warming up to the temperature that makes the lubricant oil liquid stateization.But when using polyethylene, polyimide, polyoxymethylene, PTFE resinae raw materials such as (teflon) in the solid lubricant, the heat resisting temperature that heating-up temperature is lower than above-mentioned resin is very necessary.In addition, dip time and the degree of vacuum of sliding bearing 16 in lubricant oil does not have special qualification yet, can select for use according to the oil body of using, and floods to the lubricated oil of the pore of sliding bearing 16 saturated.The following situation if give an example, being about to kinetic viscosity is 460[mm
2/ s] lubricant oil be heated to 60～80[℃], 2 * 10
-2In the vacuum of [mmHg], sliding bearing 16 is impregnated in this lubricant oil, then in such cases usually through about 1 hour, the lubricated oil of the pore of sliding bearing 16 energy is saturated.
Fig. 3 amplifies the partial cross section figure that represents the near interface between sliding bearing and the axle for medelling ground, and described sliding bearing is suitable for the grease for sliding bearing of the present invention's the 1st embodiment.
As shown in Figure 3, when sliding bearing 16 and axle 22 slide relative, under the effect of frictional heat at this moment, contain thick oil 31 and the outer simultaneously inner circumferential surface that is exposed at sliding bearing 16 of particulate solid lubricant 33 in the pore 30 that is immersed in sliding bearing 16, form thin oil film 32.The oil film 32 that is made of the lubricant oil 31 that contains this solid lubricant 33 becomes the sliding interface between sliding bearing 16 and the axle 22, and the meagre layer edgewise of the solid lubricant 33 excellent lubrication effect of performance that slides obtains excellent friction, lubrication characteristic.Because it is extremely low to contain lubricant oil 31 flowabilities that are immersed in the pore 30, so even sliding bearing 16 and axle 22 repeatedly slide relative also can run off hardly.As a result, lubricant film 32 can be through supplying with extremely for a long time sustainedly and stably.Shake the what is called " stuck phenomenon " that takes place between the axle 22 of driving and the sliding bearing 16 and be by between the two microcosmic Metal Contact and cause, but the existence by microcosmic shown in the drawings " oil is accumulated " (oil film 32) can prevent its generation.
Get back to Fig. 2, above-mentioned lubricating grease is given the grease for sliding bearing 24 in the fat hole 25, and the base oil lower than lubricant oil 31 that be kinetic viscosity particularly, uses 40[℃] time kinetic viscosity is 10～70[mm
2/ s] (preferred 30～70[mm
2/ s]) base oil, this base oil oozes out under the effect of axle 22 load, forms oil film (aftermentioned) between sliding bearing 16 and axle 22.This base oil for example is the low viscosity base oil of hydro carbons artificial oil and low viscosity mineral oil etc.In addition, in this grease for sliding bearing 24, can add the material that mixes with the low viscosity base oil as water-thickening agent, at least a in metallic soap, carbamide resin, organobentonite, silica, the fluorine-type resin etc. for example, can also add other antioxidants commonly used or high-tension lubrication oil additive (extreme pressure agent) as required, as the oiliness improver of lubricating auxiliary agent, also have tackifier etc.In addition, also can add and contain the solid lubricant that contains in the lubricant oil that is immersed in the sliding bearing 16.
The grease for sliding bearing 24 of Zu Chenging as mentioned above is by using 40[℃] kinetic viscosity is 10～70[mm
2/ s] material as base oil, can bring into play guarantee at sliding bearing 16 and the axle slide relative between 22 stop more than the certain hour during between the two the effect of lubricity.The foundation of the kinetic viscosity scope of the base oil of grease for sliding bearing 24 is as described in following.
Below, the operation and the effect of slide bearing assembly are described, this slide bearing assembly is suitable for the lubricating grease of one embodiment of the invention.
At first, shown in Fig. 3 explanation, when sliding bearing 16 and axle 22 slide relative, contain in the pore 30 that is immersed in sliding bearing 16 lubricant oil 31 and solid lubricant 33 together, be exposed at the inner circumferential surface of sliding bearing 16 outward, form thin oil film.As mentioned above, solid lubricant 33 is invaded sliding bearing 16 and the slip surface of axle between 22 with lubricant oil 31, on the slip surface between sliding bearing 16 and the axle 22, form the meagre oil film 32 that constitutes by lubricant oil 31 and solid lubricant 33, regardless of its Sliding velocity, all can be between the sliding bearing 16 of slide relative and axle 22 the excellent lubrication effect of performance.
On the other hand, mechanical motion stops, be that slide relative between sliding bearing 16 and the axle 22 is when stopping, the lubricant oil 31 that forms oil film 32 at slip surface utilizes wicking along with temperature reduces, in solid lubricant 33 is inhaled into a plurality of pores 30 that sliding bearing 16 has.At this moment, because lubricant oil 31 returns in the sliding bearing 16, so become and be exuded to sliding bearing 16 and 22 state of axle hardly, but as shown in Figure 4, under the effect of axle 22 loads, the low viscosity base oil that oozes out from grease for sliding bearing 24 forms oil film 35 at sliding bearing 16 and 22 on axle.This is because the base oil viscosity of grease for sliding bearing 24 is lower than 10～70[mm
2/ s], " wettability " excellence.Fig. 4 is the sliding bearing 16 of state of pattern ground expression oil film 35 and the sectional view of axle 22.
In addition, generally, in order to improve the performance under high surface pressure, the lubricating grease that generally is used for the sliding bearing of building machinery is set at base oil viscosity than higher value, therefore, between the axle and bearing under halted state, lubricating film is in the state of blocking.
At this moment, during hydraulic shovel certain hour out of service, the scraper bowl 10 of excavating gear 5 generally is in and the ground state of contact as shown in Figure 1, but scraper bowl is in when placing under the state outstanding from ground as shown in Figure 5, because the moment loading that the deadweight of excavating gear 5 produces is in slide bearing assembly 12.Excavating gear 5 desires are kept present posture by pressing the confining force of oil in each oil hydraulic cylinder 7,9,11, but because the minor leakage of the pressure oil of hydraulic drive circuit makes that the cylinder internal drop is low, the power of As time goes on resisting the whereabouts moment of excavating gear 5 reduces.As a result, no matter whether be in halted state fully, all have the power that makes sliding bearing 16 and axle 22 slide relative.
At this moment, suppose under the situation of not supplying with grease for sliding bearing 24, have oil film hardly between sliding bearing 16 under the above state of static relatively certain hour and the axle 22.Surface of contact as 22 on the sliding bearing 16 of oil-containing sintered alloy lining and axle is in the mutual concavo-convex less smooth state that is called " running-in state ", and the area of contact of reality is compared with the bearing unit that only uses the iron lining and enlarged markedly.Generally speaking, real contact area is big more between 2 solids as mentioned above, and the adhesive force that acts between the two is big more.That is, block the necessary energy of gluing segment then during both slide relative and increase the also corresponding increase of virtual friction power.
So, when the moment that acts on slide bearing assembly 12 surpasses the largest static frictional force act on 22 on sliding bearing 16 and axle, accumulating to the energy of this moment and discharge in the lump, both are the slide guage set a distance relatively.Then, because fretting (fretting) phenomenon that above-mentioned slide relative produces, vibration that sliding bearing 16 produces and excavating gear 5 resonance then produce unthinkable huge abnormal sound sometimes.The abnormal sound that is produced by above-mentioned fretting phenomenon can produce repeatedly until scraper bowl 10 and fall earthward.
Be directed to this, in the present embodiment, even at sliding bearing 16 and axle during 22 relative stopping, as illustrated in fig. 4,, form oil films 35 in sliding bearing 16 and 22 on axle by the effect of " wettability " of from grease for sliding bearing 24, oozing out excellent low viscosity base oil, therefore, this oil film becomes lubricating film, can reduce the frictional force of 22 on sliding bearing 16 and axle, suppresses the generation of abnormal sound or the abnormal sound that reduces to produce.
Fig. 6 is the partial cross section figure that pattern ground amplifies the near interface of expression sliding bearing and axle, and described sliding bearing is suitable for the grease for sliding bearing of the present invention's the 2nd embodiment.The part identical with the accompanying drawing that has occurred used and the identical symbol of part that has occurred among this figure, omits explanation.
Identical with top embodiment, the sliding bearing 16 in the present embodiment is also formed by the complex sintered alloy of porous, but impregnation does not contain the high viscosity lubricant oil of solid lubricant in its pore.When making sliding bearing 16 soaking by lubricating oil, replace the lubricant oil that contains solid lubricant of above-mentioned embodiment, similarly implement to get final product with above-mentioned embodiment with the lubricant oil that does not contain solid lubricant of the present embodiment.
As shown in Figure 6, in the present embodiment, when sliding bearing 16 and axle 22 slide relative, under the effect of frictional heat at this moment, the full-bodied lubricant oil 31 outer inner circumferential surfaces that are exposed at sliding bearing 16 that contain in the pore 30 that is immersed in sliding bearing 16 form thin oil film 32.The oil film 32 of this moment becomes the sliding interface between sliding bearing 16 and the axle 22, and the performance lubrication effect obtains excellent friction, lubrication characteristic.The lubricant oil 31 of impregnations in the pore 30 is because flowability is extremely low, so even sliding bearing 16 and axle 22 repeatedly slide relative also can run off hardly.As a result, can be extremely for a long time supplying lubricating oil film 32 sustainedly and stably.Shake the what is called " stuck phenomenon " that takes place between the axle 22 of driving and the sliding bearing 16 and be by between the two microcosmic Metal Contact and cause, but the existence by microcosmic shown in the drawings " oil is accumulated " (oil film 32) can prevent its generation.
Herein, in the present embodiment, above-mentioned lubricating grease adds the solid lubricant identical with the 1st embodiment for the grease for sliding bearing 24 in the fat hole 25 (referring to Fig. 2) in the base oil identical with the 1st embodiment.That is, in the 1st embodiment, contain in the lubricant oil 31 that is immersed in the sliding bearing 16 and contain solid lubricant, and lubricating grease is given in the grease for sliding bearing 24 in the fat hole 25 and contained solid lubricant in the present embodiment.
The grease for sliding bearing 24 of the present embodiment of Zu Chenging can be brought into play following effects as mentioned above, promptly by using 40[℃] time kinetic viscosity be 10～70[mm
2/ s] material as base oil, can be between sliding bearing 16 and axle 22 slide relative stop more than the certain hour during in guarantee between the two lubricity; By further interpolation solid lubricant, guarantee lubricity between the two when axle 22 with respect to sliding bearing 16 small shaking is taken place.
In the present embodiment, when sliding bearing 16 and axle 22 slide relative, contain the lubricant oil 31 outer inner circumferential surfaces that are exposed at sliding bearing 16 in the pore 30 that is immersed in sliding bearing 16, form thin oil film 32.At this moment, between sliding bearing 16 and axle 22, have the grease for sliding bearing 24 of giving fat hole 25 from lubricating grease, the microgranular solid lubricant of sneaking into grease for sliding bearing 24 enters between sliding bearing 16 and the axle 22.Solid lubricant immerses sliding bearing 16 and the slip surface of axle between 22 with lubricant oil 31 thus, thereby the slip surface on 22 on sliding bearing 16 and axle forms the meagre layer that is made of the grease for sliding bearing 24 that contains lubricant oil 31 and solid lubricant, at sliding bearing 16 and 22 excellent lubrication effects of performance of axle of slide relative.
About other formations and effect, the present embodiment is identical with the 1st embodiment, can access the action effect identical with the 1st embodiment.
In addition, sliding bearing 16 and axle 22 carry out only trickle slip small shake or during motion that utmost point low speed slides and so on, produce higher surface pressure owing to compare when stopping, therefore at the thickness that can not obtain being enough to lubricated this slip by the formed oil film 35 of the base oil of grease for sliding bearing 24.And, because the frictional heat that produces under this situation is very micro-, make lubricant oil 31 fully not ooze out sometimes.As a result, produce local surface pressure, the abrasion that parts such as " blocking " may take place at the surface or sliding bearing 16 inner circumferential surfaces of axle 22 injures the abnormal sound with its generation.
Be directed to this, in the present embodiment, owing to promptly immerse the solid lubricant that contains in the grease for sliding bearing 24 between 22,, also can guarantee sufficient lubrication effect even therefore under situation with lower speed driving at sliding bearing 16 and axle.Certainly, when comparing with high-speed driving excavating gear 5,, therefore ooze out the lubricant oil 31 of required q.s, can bring into play the lubrication effect of the original excellence of oil-containing sintered alloy lining owing to can obtain sufficient frictional heat with it.
In addition, though the static mutually but motor of sliding bearing 16 and axle 22 is still when work on the surface, slide bearing assembly 12 is passed in this vibration, thus between sliding bearing 16 and axle 22 moment produce higher surface pressure, and on the microcosmic trickle slip is taking place between sliding bearing 16 and the axle 22.As mentioned above, even excavating gear 5 self is not worked, because of sliding bearing when the engine-driving 16 and axle 22 are not in relative static conditions, so produce above-mentioned adhesive force hardly, when this state makes excavating gear 5 small shaking, be difficult to take place the fretting phenomenon.In addition, also comprise the effect of the solid lubricant that contains in the sliding bearing 16 this moment, and the slip operation of slide bearing assembly 12 is lubricated.Even the fretting phenomenon takes place, also because above-mentioned adhesive force is very little, therefore the abnormal sound that produces diminishes, and reaches the degree that can be mingled in the engine sound.
The composition of grease for sliding bearing of the present invention and commercially available lubricating grease and the comparative result of performance test are as shown in Figure 7.
The applicant etc. study the mechanism of fretting phenomenon and lubricating grease and its relation, have implemented this test, and the result is set at above-mentioned scope with the kinetic viscosity scope of the base oil of grease for sliding bearing of the present invention.
In this test, make basic lubricating grease (base grease) according to the method identical with common manufacturing lithium grease, additive package in the basic lubricating grease that manufacturing obtains, after the mixing processing of triple-roller mill, with denseness furnishing NLGI (National Lubricating GreaseInstitute) No.2 grade (denseness: 265～295), make the sample 1～5 of grease for sliding bearing of the present invention.Then, performance and the commercially available product 1～3 with this sample 1～5 compares.
At first, sample 1～5 all with mineral oil as base oil, water-thickening agent uses lithium, additive to use high-tension lubrication oil additive (extreme pressure agent) rust preventing agent organic-molybdenum (solid lubricant) oiliness improver.But the kinetic viscosity of used base oil differs from one another in the sample 1～5,40[℃] time sample 1～5 the kinetic viscosity value [mm of base oil
2/ s] be respectively 10,22,32,46,68.
With respect to this, be used for the commercially available product 1,2 of comparison, be extremely generally to supply the material of fat in the slide bearing assembly of the excavating gear of as shown in Figure 1 hydraulic shovel.In addition, commercially available product 3 is materials that base oil viscosity is higher, extreme pressure property is high.The denseness of commercially available product 1～3 all is the NLGINo.2 grade, but the kinetic viscosity value [mm of the base oil of commercially available product 1～3 (mineral oil)
2/ s] be respectively 143,93,430.
Use above sample 1～5 and commercially available product 1～3, its withstand load performance and wear resistance are tested, sample 1～5 obtains the value equal with commercially available product 1,2 aspect wear-resisting property as a result, obtains equal or than its excellent value with it at the withstand load aspect of performance.What particularly point out is, it is 3090[N that sample 4,5 obtains the withstand load performances] the high value.Need to prove, carry out the withstand load performance test by high speed four-ball test (1770[rpm] * 10[sec]), by the high speed four-ball test (1220[rpm] * 40[kgf] * 75[℃] * 1[hr]) carry out abrasion test.
In addition, use sample 1～5 and commercially available product 1～3, estimate friction factor.The evaluating method of friction factor is as follows: as test film, the diameter of preparing to make with the oil-containing alloy is 60[mm] disk, the surface carried out the φ 4[mm of high frequency hardening] * 6[mm] pin of (with the surface of contact of disk: R=2[mm]), in the presence of each lubricating grease, pin is slided repeatedly with respect to disk, judge according to the passing of the friction factor of measuring this moment.Test conditions is: Sliding velocity: 180[mm/min], slip amplitude: 10[mm], pin is to the load that applies of disk: 1[kg], lubricating grease thickness: 0.2[mm], begin to measure the friction factor of certain hour (be 5000 times reciprocatingly slide time) after the beginning of sliding herein through the stipulated time point.The figure that represents its measurement result as shown in Figure 8.
The inventor etc., based on the plotted curve of this Fig. 8, the sample that whole beginning is stabilized in low value is evaluated as " zero ", and initial value is lower but be evaluated as " △ " from the sample that raises midway, and beginning eventually is evaluated as " * " for the sample of high value.Its result for base oil viscosity significantly high commercially available product 3 be evaluated as *, sample 1,2 and commercially available product 1,2 are be evaluated as △, commercially available product 5 is be evaluated as △～zero, commercially available product 3,4 is be evaluated as zero.
In addition, about the effect confirmation method in real machine, supply with sample 1～5 and commercially available product 1～3 respectively to each slide bearing assembly of hydraulic shovel excavating gear, for example as shown in Figure 5, scraper bowl 10 built on stilts (for example about 1[m]) are suspended stop, measuring because the production of abnormal sound in 30 minutes due to the slip of the slide bearing assembly 12 between shear leg 6 and the dipper 8, between dipper 8 and the scraper bowl 10.At this moment, for bigger moment loading in slide bearing assembly 12, on scraper bowl 10, hang the hammer of about 1t.
The inventor etc. experimentize as mentioned above, evaluation of result is as follows: the abnormal sound frequency is " ◎ " when (average below 1 time/minute) below 30 times, when (average below 2 times/minute) below 60 times is " zero ", when (average below 3 times/minute) below 90 times is " △ ", when (average below 4 times/minute) below 120 times is " * ", more than 120 times when (average more than 4 times/minute) be " * * ".The result shows, the evaluation of commercially available product 1～3 all is below " * ", even particularly the remarkable commercially available product 3 that increases of the kinetic viscosity of base oil is compared also not conduct preferably with commercially available product 1,2, and sample 1～5 is compared with the situation of using commercially available product 1～3, has reduced the frequency of abnormal sound significantly.
By the result of this performance test as can be known, if use 40[℃] down the kinetic viscosity of base oil be about 70[mm
2/ s] following lubricating grease, then compare the generation that can suppress abnormal sound with commercially available lubricating grease.On the other hand, 40[℃] under kinetic viscosity less than 10[mm
2/ s] oil very special, and be of little use, in mineral oil, almost do not have, though be present in a part of artificial oil, be not suitable as grease base plinth oil owing to flash point is low, as long as so the lower limit of base oil viscosity be set at 10[mm
2/ s] get final product.As mentioned above, by using 40[℃] down the kinetic viscosity of base oil be 10～70[mm
2/ s] lubricating grease, can suppress the generation of abnormal sound.Wherein, confirmed that sample 3～5 has good abnormal sound and suppresses effect, therefore suppressed aspect the effect preferred 40[℃ especially obtaining abnormal sound] down the kinetic viscosity of base oil be 30～70[mm
2/ s] lubricating grease.
In addition, in this performance test, the initial just various lubricating grease of supply in slide bearing assembly, at the stage is in the solid lubrication state in the early stage, can abnormal sound generation back suppress abnormal sound for fat and test, even results verification give with commercially available lubricating grease also to no effect, and can improve the phenomenon that abnormal sound occurs immediately when giving with lubricating grease of the present invention.
In addition, in the present invention, the viscosity of lubricating grease self does not have special qualification, only limits the kinetic viscosity of the base oil that is oozed out by lubricating grease.So, can be to form behind the pasty state viscosity that can be coated on the slide bearing assembly with round end scraper etc., maybe can inject by pipe etc., also can be the viscosity that can spray by sprayer etc. with behind the solvent dilution.
In addition, in the 1st embodiment, be set forth in the oil-containing sintered alloy lining that contains solid lubricant in the lubricant oil of impregnation and describe, but impregnation does not contain the grease for sliding bearing of yet applicable the 1st embodiment of oil-containing sintered alloy lining of the lubricant oil of solid lubricant as the suitable example of the grease for sliding bearing of the 1st embodiment.
More than the sliding bearing of the hinge portion of the excavating gear that is arranged on hydraulic shovel is suitable for lubricating grease of the present invention situation be illustrated, in addition, also to go for building machinery, building machinery, Transport Machinery, hoist, lathe, automobile etc. be the sliding bearing that uses everywhere of the various machineries of representative to lubricating grease of the present invention.
Claims (7)
1, a kind of grease for sliding bearing (24), described lubricating grease is supplied to by containing the sliding bearing (16) that the porous sintered alloy lining that is soaked with lubricant oil (31) constitutes in the pore (30) and inserting among the described sliding bearing (16) and with between the supported axle (22) of the mode of rotational slide along the circumferential direction
It is characterized by: it is 10～70mm that described grease for sliding bearing (24) uses 40 ℃ of following kinetic viscosities
2/ s, at the base oil that oozes out and between described sliding bearing (16) and described (22), form oil film (35) under the load effect of described axle (22).
2, a kind of grease for sliding bearing (24), described lubricating grease has been supplied to by impregnation in the pore (30) sliding bearing (16) that the porous sintered alloy lining of the lubricant oil (31) that is mixed with solid lubricant (33) constitutes and has inserted among the described sliding bearing (16) and with between the supported axle (22) of the mode of rotational slide along the circumferential direction
It is characterized by: it is 10～70mm that described grease for sliding bearing (24) uses 40 ℃ of following kinetic viscosities
2/ s, at the base oil that oozes out and between described sliding bearing (16) and described (22), form oil film (35) under the load effect of described axle (22).
3, a kind of grease for sliding bearing (24), described lubricating grease is supplied to by containing the sliding bearing (16) that the porous sintered alloy lining that is soaked with lubricant oil (31) constitutes in the pore (30) and inserting among the described sliding bearing (16) and with between the supported axle (22) of the mode of rotational slide along the circumferential direction
It is characterized by: described grease for sliding bearing (24) use kinetic viscosity lower than described lubricant oil (31), at the base oil that oozes out and between described sliding bearing (16) and described (22), form oil film (35) under the load effect of described axle (22).
4, a kind of grease for sliding bearing (24), described lubricating grease is supplied to by containing the sliding bearing (16) that the porous sintered alloy lining that is soaked with lubricant oil (31) constitutes in the pore (30) and inserting among the described sliding bearing (16) and with between the supported axle (22) of the mode of rotational slide along the circumferential direction
It is characterized by: described grease for sliding bearing (24) is to use base oil, and adds solid lubricant at least and form, and the kinetic viscosity of wherein said base oil under 40 ℃ is 10～70mm
2/ s is oozing out under the load effect of described axle (22) and forming oil film (35) between described sliding bearing (16) and described axle (22).
5, a kind of grease for sliding bearing (24), described lubricating grease is supplied to by containing the sliding bearing (16) that the porous sintered alloy lining that is soaked with lubricant oil (31) constitutes in the pore (30) and inserting among the described sliding bearing (16) and with between the supported axle (22) of the mode of rotational slide along the circumferential direction
It is characterized by: described grease for sliding bearing (24) is to use base oil, and adds solid lubricant at least and form, the kinetic viscosity of wherein said base oil is lower than described lubricant oil (31), is oozing out under the load effect of described axle (22) and form oil film (35) between described sliding bearing (16) and described axle (22).
6, as claim 2,4 or 5 each described grease for sliding bearing (24), it is characterized by, described solid lubricant (33) contains at least a in organic-molybdenum, molybdenum disulfide, tungsten disulfide, boron nitride, graphite, nylon, polyethylene, polyimide, polyoxymethylene, teflon, the polyphenylene sulfide.
7, as each described grease for sliding bearing (24) in the claim 1～5, it is characterized by, in described grease for sliding bearing (24), add extreme pressure agent and oiliness improver.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP316745/2004 | 2004-10-29 | ||
| JP316755/2004 | 2004-10-29 | ||
| JP2004316745A JP4451276B2 (en) | 2004-10-29 | 2004-10-29 | Grease for slide bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1961162A true CN1961162A (en) | 2007-05-09 |
| CN100497977C CN100497977C (en) | 2009-06-10 |
Family
ID=36720494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800178696A Expired - Fee Related CN100497977C (en) | 2004-10-29 | 2005-10-25 | Grease for sliding bearing |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4451276B2 (en) |
| CN (1) | CN100497977C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102604725A (en) * | 2012-02-20 | 2012-07-25 | 上海纳克润滑技术有限公司 | Shield machine base bearing special-purposed sealing grease and preparation method thereof |
| CN103299093A (en) * | 2011-01-07 | 2013-09-11 | 日立建机株式会社 | Sliding bearing and construction machine provided with same |
| CN104343816A (en) * | 2013-07-29 | 2015-02-11 | 联想(北京)有限公司 | Bearing and rotation structure |
| CN106369108A (en) * | 2015-07-22 | 2017-02-01 | 岳盟企业股份有限公司 | Hinge pin of chain, manufacturing method for hinge pin of chain, and manufacturing method for chain |
| CN107501865A (en) * | 2017-09-04 | 2017-12-22 | 安徽天裕汽车零部件制造有限公司 | A kind of production technology of vehicle transmission support base |
| CN109027005A (en) * | 2018-10-11 | 2018-12-18 | 珠海亿华电动车辆有限公司 | A kind of bearing with graphite copper sheathing, articulated frame and sweeper |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5523223B2 (en) * | 2010-07-01 | 2014-06-18 | 日立粉末冶金株式会社 | Sintered oil-impregnated bearing |
| JP6072408B2 (en) * | 2011-09-22 | 2017-02-01 | Ntn株式会社 | Sliding bearing and image forming apparatus |
| JP2014202796A (en) * | 2013-04-01 | 2014-10-27 | 船井電機株式会社 | Image forming apparatus and electronic device |
-
2004
- 2004-10-29 JP JP2004316745A patent/JP4451276B2/en active Active
-
2005
- 2005-10-25 CN CNB2005800178696A patent/CN100497977C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103299093A (en) * | 2011-01-07 | 2013-09-11 | 日立建机株式会社 | Sliding bearing and construction machine provided with same |
| CN103299093B (en) * | 2011-01-07 | 2015-10-21 | 日立建机株式会社 | Sliding bearing and there is the engineering machinery of this sliding bearing |
| CN102604725A (en) * | 2012-02-20 | 2012-07-25 | 上海纳克润滑技术有限公司 | Shield machine base bearing special-purposed sealing grease and preparation method thereof |
| CN102604725B (en) * | 2012-02-20 | 2014-07-30 | 上海纳克润滑技术有限公司 | Shield machine base bearing special-purposed sealing grease and preparation method thereof |
| CN104343816A (en) * | 2013-07-29 | 2015-02-11 | 联想(北京)有限公司 | Bearing and rotation structure |
| CN104343816B (en) * | 2013-07-29 | 2017-07-21 | 联想(北京)有限公司 | A kind of bearing and a kind of rotational structure |
| CN106369108A (en) * | 2015-07-22 | 2017-02-01 | 岳盟企业股份有限公司 | Hinge pin of chain, manufacturing method for hinge pin of chain, and manufacturing method for chain |
| CN107501865A (en) * | 2017-09-04 | 2017-12-22 | 安徽天裕汽车零部件制造有限公司 | A kind of production technology of vehicle transmission support base |
| CN109027005A (en) * | 2018-10-11 | 2018-12-18 | 珠海亿华电动车辆有限公司 | A kind of bearing with graphite copper sheathing, articulated frame and sweeper |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100497977C (en) | 2009-06-10 |
| JP2006125567A (en) | 2006-05-18 |
| JP4451276B2 (en) | 2010-04-14 |
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