CN100591938C - Collapsible column - Google Patents

Abstract

A collapsible column transmitting a torque when rotated by unrotatably and slidably fitting a male shaft into a female shaft so that the outer peripheral part of the male shaft can be brought into contact with the inner peripheral part of the female shaft. A grease containing a base oil having a dynamic viscosity at 25 DEG C of 10 to 210 mm<2>/s and an extreme-pressure additive is sealed in a clearance between the outer peripheral part of the male shaft and the inner peripheral part of the female shaft. By such a structure, the torque can be well transmitted without affecting steering feeling.

Description

Telescopic shaft

Technical field

The present invention relates to a kind of telescopic shaft that is assemblied in vehicle steering shaft etc.

Background technique

Portion of existing car steering mechanism, use utilizes chimeric male axle of spline and female telescopic shaft, and this telescopic shaft used in the part of portion of steering mechanism, be created in axial displacement so that when car steering, absorb, and this displacement or slip can't be delivered on the steering wheel.The slip opposing that requirement can reduce telescopic shaft when sliding on the axle direction of spline part.

Therefore,, and further lubricating grease is coated on the slide part, realizes the reduction of sliding and resisting the spline part of nylon membrane surface applied at the male axle of telescopic shaft.In addition, well-known telescopic shaft for motor vehicle steering: groove by inner shafts and the elastic component between the ball are configured in ball on the peripheral part that is arranged on inner shafts in the groove portion on the interior perimembranous with outboard shafts, axial when mobile by ball is rotated, thereby the male axle and the sliding load of female axle are reduced, simultaneously restriction ball and transmitting torque (referring to patent documentation 1) when rotating.In this telescopic shaft for motor vehicle steering, even and then for also can transmitting torque when ball is damaged, the male groove and the female groove that have certain play and have an assembling section are arranged on inner shafts and the outboard shafts.

Patent documentation 1: the spy opens the 2001-50293 communique

Summary of the invention

,, produce at sliding parts when sometimes present dynasty is axially flexible and block or moment of torsion change etc., and it is delivered to steering wheel as slip even on the chimeric telescopic shaft of this spline, thereby to turning to sense to produce ill effect.The present invention is exactly the invention of making in view of above-mentioned problem, and it is a kind of not to turning to sense to produce baneful influence and telescopic shaft that can transmitting torque that purpose is to provide.

For achieving the above object, the invention provides a kind of telescopic shaft, male axle is chimeric in the mode that can not rotate and be free to slide with female axle, when the interior perimembranous of the peripheral part of above-mentioned male axle and above-mentioned female axle contacts with each other and rotates, transmitting torque is characterised in that: kinematical viscosity is at 10mm in the time of will containing 25 ℃ ²/ s is above, 210mm ²The lubricating grease of the following base oil of/s and extreme pressure agent is infused in the peripheral part of above-mentioned male axle and the gap between the above-mentioned female interior perimembranous.

Telescopic shaft of the present invention, owing to inject base oil and extreme pressure agent that lubricating grease contains special exercise viscosity, so the static friction and the difference of kinetic friction in the time of can reducing telescopic shaft and slide are blocked or the generation of moment of torsion change etc. thereby can limit, and prevent because slip brings the deterioration that turns to sense.

Description of drawings

Fig. 1 is the side view of the automotive steering structure portion of suitable telescopic shaft of the present invention.

Fig. 2 is illustrated in the longitudinal sectional drawing that the bottom turns to the telescopic shaft example at axial region and top steering shaft place.

Fig. 3 is the transverse cross-sectional view of expression along the female shaft end of telescopic shaft of Fig. 2.

Fig. 4 is another routine longitudinal sectional drawing of expression telescopic shaft.

Fig. 5 is the AA sectional drawing of Fig. 4.

Fig. 6 is another routine longitudinal sectional drawing of expression telescopic shaft.

Fig. 7 is the XX sectional drawing of Fig. 7.

The coordinate diagram of the amounts of thickener that Fig. 8 obtains from embodiment for expression and the relation of hand sense of touch.

Fig. 9 represents from the M of embodiment's acquisition _OThe coordinate diagram of the relation of DTP adding quantity and hand sense of touch.

Figure 10 is the coordinate diagram from the relation of the base oil kinematical viscosity of embodiment's acquisition and hand sense of touch.

Label declaration

5,41,61 male axles

6,42,62 female axles

20 spline slide parts

46 hole enlargement parts

47 adjust screw

63,65 axle direction grooves

67 spheroids

69 leaf springs

104 steering shafts

107 bottoms turn to axial region

120 tops turn to axial region

Embodiment

Below, explain the present invention with reference to the accompanying drawings.

Fig. 1 is the side view of the automotive steering structure of the telescopic shaft of suitable embodiment of the present invention.In Fig. 1, portion of steering equipment is by constituting as the bottom: the top that utilizes upper bracket 101 and lower tray 102 to be installed in member 100 places of railway carriage side turns to axial region 120 (comprising: steering column 103, the steering shaft 104 that remains on the steering column 103 free to rotate); Be installed in the steering wheel 105 of steering shaft 104 upper ends; Turn to axial region 107 by omnipotent shaft coupling 106 with the bottom that the lower end of steering shaft 104 is connected; The pinion shaft 109 that turns to axial region 107 to be connected by steering shaft coupling 108 and bottom; The steering rack axle 112 that is connected with pinion shaft 109; And support this steering rack axle 112 and utilize elastic component 111 to be fixed on the steering rack supporting part 113 at the other frame of railway carriage 110 places.

In addition, the bottom turns to axial region 107 and top to turn to axial region 120 to have telescopic shaft.Example as shown in Figures 2 and 3, with regard to telescopic shaft, female spline is formed on the inner headed face of male axle 6, and male axle 5 has the spline slide part 20 that is formed with the male flower key on its outer peripheral surface and the axial region 21 littler than these spline slide part 20 diameters.Male axle 6 has the abjunction preventing part 30 that the slide part 20 that is used to prevent male axle 5 comes off at its place, end.In addition, other parts coating PA membranes except the position 20a of the abjunction preventing part side of spline slide part 20.Coating can be used polyflon (PTFE), polyimide or solid lubricant film etc.

Telescopic shaft also can have the structure as Fig. 4 and Fig. 5.The female axle 42 of this telescopic shaft is entrenched on the male axle 41 with spline or lance tooth spline mode.Be formed with the base element cylindraceous 43 that is used to insert hole enlargement parts 46 in the end inner peripheral surface of male axle 41, and on the part of this base element 43, be used for being formed on the footpath direction adjusting the through hole 44 that screw 47 runs through insertion.In the end of female axle 42, with through hole 44 accordingly, be used for being formed on the footpath direction with adjusting the through hole 45 that screw 47 runs through insertion.In addition, in the base element 43 of male axle 41, be inserted with the hole enlargement parts 46 that are used for the male axle 41 of radius vector direction pushing, and in these hole enlargement parts 46, on the direction of footpath, be screwed with the adjustment screw 47 that is used for these hole enlargement parts 46 hole enlargements.And, be provided with on the direction of footpath, to have at hole enlargement parts 46 and be used for and the screwing part 48 of adjusting the female screw thread that screw 47 is screwed, and be provided with the portion of bearing 49 of the front end that supports adjustment screw 47 with these screwing part 48 subtends ground.This screwing part 48 has the flange circumference shape portion that contacts with the inboard tubular base element 43 of male axle 41 at outside diameter respectively with the portion of bearing 49.And then, on hole enlargement parts 46, be provided with joint 50, this joint 50 on the direction of footpath elastically deformable ground and screwing part 48 with bear portion 49 and link into an integrated entity.

In this telescopic shaft, with female axle 42 in the spline mode chimeric and be assembled on the male axle 41 after, make through hole 44 consistent on the direction of footpath with 45, and when clamping adjustment screw 47 by through hole 44,45 on one side, on one side that this screw radius vector direction is interior when mobile, the screwing part 48 of bore components 46 with bear the interval of portion 49 on the direction of footpath and enlarge, thereby with hero axle 41 with respect to export-oriented pushing of female axle 42 radius vector directions.And, by adjusting the clamping force of screw 47, can adjust the pushing force on the male axle 41 footpath directions of female axle 42, thus, can easily adjust the slip opposing of two axles 41,42, and also can prevent rocking of two axles 41,42 effectively.In addition, even after 41,42 assemblings of two axles, owing to can easily adjust the opposing of sliding, so can increase work efficiency.And,, locate to carry out ca(u)lk in advance shown in the label 51 on the screwing part 48 of bore components 46 for preventing to adjust the loosening of screw 47.

In addition, telescopic shaft also can have the structure as Fig. 6 and Fig. 7.Be formed on the outer peripheral surface of male axle 61 along three axle direction grooves 63 of circumferencial direction with 120 degree interval (phase place) equivalent arrangements with prolonging.Corresponding to this, also be formed on the inner headed face of female axle 62 along three axle direction grooves 65 of circumferencial direction with 120 degree interval (phase place) equivalent arrangements with prolonging.Between the axle direction groove 65 of the axle direction groove 63 of male axle 61 and female axle 62, spheroid 67 rotors, the ball of a plurality of rigid bodies is installed free to rotately), this spheroid 67 rotates when axle direction relatively moves at two axles 61,62.And axle direction groove 65 sections of female axle 62 roughly are circular-arc or are Gothic cusped arch shape.In addition, the axle direction groove 63 of male axle 61 is made of the planar side 63a of pair of angled and the bottom surface 63b that is formed flatly between this pair of planar shape side 63a.

The leaf spring 69 that contacts with spheroid 67 and be used for precompressed is installed between the axle direction groove 63 of male axle 61 and the spheroid 67.Shown in Fig. 6 (B), this spring body 69 has: the spheroid side contacts 69a of portion that contacts with 67 two of spheroids; The 69a of portion roughly separates with predetermined distance along circumferencial direction with the spheroid side contacts, and with the planar side 63a of the axle direction groove 63 of male axle 61 69b of grooved surface side contacts portion in contact; To the spheroid side contacts 69a of portion and the grooved surface side contacts 69b of portion towards mutually away from direction on the force section 69c of the application of force flexibly; And the bottom 69d relative with the bottom surface 63b of axle direction groove 63.This force section 69c is the roughly circular-arc bending shape that bends to that roughly is the U word shape, by the force section 69c of this bending shape, can be flexibly to the spheroid side contacts 69a of portion and the grooved surface side contacts 69d of the portion application of force, make its mutually away from.

As shown in Figure 7, be formed on the periphery of male axle 61 along three axle direction grooves 64 of circumferencial direction with 120 degree interval (phase place) equivalent arrangements with prolonging.Corresponding to this, also be formed on the inner headed face of female axle 62 along three axle direction grooves 66 of circumferencial direction with 120 degree interval (phase place) equivalent arrangements with prolonging.Between the axle direction groove 66 of the axle direction groove 64 of male axle 61 and female axle 62, the cylindrical body 68 (slide mass, needle rollers relative) of a plurality of rigid bodies is installed with having micro-gap, and above-mentioned cylindrical body 68 smoothly slides when axle direction relatively moves at two axles 61,62.And these axle direction groove 64,66 sections roughly are circular-arc or are Gothic cusped arch shape.

In addition, as shown in Figure 6, be arranged on the end of male axle 61, and be with elastomeric check plate 70, prevent coming off of spheroid 67, cylindrical body 68, leaf spring 69 by this with elastomeric check plate 70.

On this telescopic shaft, spheroid 67 is installed between male axle 61 and the female axle 62, and by leaf spring 69, spheroid 67 is pre-stressed to the degree that can not rock to female axle 62, when transmitting torque not, can prevent rocking between male axle 61 and the female axle 62 effectively, and male axle 61 with female 62 when axle direction relatively moves, can rock and stable sliding load and sliding with nothing.When transmitting torque, leaf spring 69 resiliently deformables also limit spheroid 67 in a circumferential direction, and the three row's cylindrical bodys 68 that are installed between male axle 61 and the female axle 62 play main moment of torsion transfer function.For example, during from male axle 61 input torques,, and make leaf spring 69 produce and transmit this moment of torsion with respect to the counter-force of moment of torsion because stage in the early stage is applied with the precompressed of leaf spring 69, thereby can rock.At this moment, transmitting torque between male axle 61, leaf spring 69, spheroid 67, the female axle 62 and input torque carry out whole moment of torsion transmission with the state of balance.When moment of torsion further increases, by cylindrical body 68 gap of male axle 61, female axle 62 sense of rotation is become and do not exist, the increase part of moment of torsion after then cylindrical body 68 transmits via male axle 61, female axle 62.Therefore, can prevent rocking on male axle 61 and female axle 62 sense of rotation effectively, and can be under the state of high rigidity transmitting torque.

Be injected with in the gap between the outer circumference portion of the male axle of each telescopic shaft of said structure and the female inner circumference portion as the lubricating grease shown in hereinafter.

If grease base oil in the time of 25 ℃ kinematical viscosity at 10mm ²/ s is above, 210mm ²When/s is following, does not just limit to its kind, but preferably use mineral oils lubricating grease and synthetic grease.Kinematical viscosity surpasses 210mm in the time of 25 ℃ ²The base oil of/s, this base oil is difficult to enter into sliding contacting part, blocking or moment of torsion change etc. on the slip surface that also just the become peripheral part that is difficult to suppress male axle and female interior perimembranous contact with each other.Kinematical viscosity is at 110mm in the time of 25 ℃ ²Below/effect of the base oil of s is relatively good.More preferably at 100mm ²/ s following (25 ℃) is most preferably at 80mm ²/ s following (25 ℃).On the other hand, the lower limit of kinematical viscosity is at 10mm ²/ s (25 ℃), if be lower than this value, then oil film formation power descends, so not preferred.Preferably at 20mm ²/ s above (25 ℃) is more preferably at 40mm ²/ s above (25 ℃).

For mineral oils lubricating grease without limits, for example can use, paraffin class mineral oil, naphthenic mineral oil and their miscella, the mineral oils lubricating grease after preferred especially appropriate combination decompression distillation, surface active agent depitching, solvent extraction, hydrogenolysis, solvent dewaxing, sulfuric acid are clean, clay-filtered, hydrofinishing etc. made with extra care.In addition, synthetic grease for example can use also without limits, synthetic hydrocarbon oil, ether oil, ester oil and fluorocarbon oil.Particularly, can enumerate respectively: the poly alpha olefin wet goods is as synthetic hydrocarbon oil, dialkyl diphenyl ether oil, alkyl triphenyl ether oil, alkyl tetraphenyl ether oil etc. are as ether oil, diester oil, new penta type polyatomic alcohol polybasic alcohol ester oil or their compound ester oil, and the aromatic ester wet goods is as ester oil.These lubricating grease can use separately, also multiple appropriate combination can be used, and can be adjusted to above-mentioned kinematical viscosity.Wherein, preferred diester oil, polyatomic alcohol polybasic alcohol ester oil, aromatic ester wet goods ester oil, preferred especially is the main component of base oil with polyatomic alcohol polybasic alcohol ester oil.

As water-thickening agent, can use and in base oil, be dispersed into colloidal state, base oil is made the material of semisolid or solid.As such water-thickening agent, can enumerate for example metallic soap of lithium soap class, calcium soap class, soda soap class, aluminium soap class, lithium compound soap class, calcium compound soap class, sodium compound soap class, barium compound soap class, aluminium compound soap class, the inorganic compound of swelling great soil group, clay class, single ureas, allophanamide class, three ureas, four ureas, urethanes, para-phthalic sodium class organic compound etc.These water-thickening agents can use separately, also can mix two or more uses.

The content of water-thickening agent is 5～30 quality % of lubricating grease total amount.When being lower than 5 quality %, be difficult to keep the lubricating grease state, and when being higher than 30 quality %, really up to the markly can not obtain enough lubricating status.Be preferably 13～23 quality % of lubricating grease total amount, 14～22 quality % of lubricating grease total amount more preferably most preferably are 15～21 quality % of lubricating grease total amount.

In addition, when in water-thickening agent, using urea compounds, form protective film in the metal surface during slip, can give better frictional behavior.And when the amount of water-thickening agent is more than the 15 quality % and 21 quality % when following, the protective film of formation is more strong, can suppress to block or moment of torsion change etc.

In urea compounds, because double urea compound has heat resistance, oil retention is good, and is inexpensive, therefore is the water-thickening agent that turns to telescopic shaft applicable to automobile.Wherein, be preferably the double urea compound of representing with following general formula [I].

[Chemical formula 1]

In the formula, R ₂The fragrant same clan alkyl of expression carbon number 6～15, R ₁, R ₃Represent alkyl or condense alkyl (the plain base of condensation charing water), can be the same or different.In addition, R ₁, R ₃In, alkyl can be any one of aliphatic alkyl, aromatic hydrocarbyl, the carbon number that condenses alkyl is preferably 9～19.

By in base oil, with respect to 1 mole of R that is contained in the skeleton ₂Vulcabond is with the R that contains in the skeleton ₁Or R ₃Monoamine adds up to, and its ratio with 2 moles is reacted, and obtains the double urea compound with general formula [I] expression.

As the R that contains in the skeleton ₂Vulcabond can be fit to use '-diphenylmethane diisocyanate, toluene di-isocyanate(TDI), XDI, two biphenylene isocyanates, dimethyl diphenyl vulcabond or their alkyl substituent etc.

As the alkyl R that contains in the skeleton ₁Or R ₃Monoamine can be fit to use aniline, cyclohexylamine, octylame, toluidines, dodecyl polyaniline, octadecyl aniline, hexylamine, heptyl amice, nonyl amine, octodrine (エ チ Le エ キ シ Le ア ミ Application), decyl amine, undecyl amine, lauryl amine, tetradecylamine, pentadecyl amine, nonadecyl amine, eicosyl acid, oleyl amine, inferior oleyl amine, flax amine, methyl cyclohexylamine, ethyl cyclohexylamine, dimethyl cyclohexyl amine, diethyl cyclohexylamine, the butyl cyclohexylamine, the propyl group cyclohexylamine, the amyl group cyclohexylamine, cyclooctylamine, benzylamine, benzhydrylamine, phenyl ethylamine, methylbenzylamine, benzidine, isopropyl aniline, hexyl aniline etc.

In addition, as R ₁, R ₃The monoamine of the fused rings alkyl that in skeleton, contains, general being fit to, for example use, amino indenes, aminoidan, amino-indenes amine compounds such as 1-benzofulvene, amino naphthalenes (naphthylamines), amino methyl amine, amino ethyl amine, amino dimethyl amine, amino cadalene (ア ミ ノ カ ダ レ Application), amino vinylnaphthalene, the aminophenyl naphthalene, the aminobenzyl naphthalene, amino dinaphthylamine, amino dinaphthalene, amino-1, the 2-dihydronaphthalene, amino-1, the 4-dihydronaphthalene, amino naphthane, amino drinox naphthalene class amino-compounds such as (ア ミ ノ オ Network タ リ Application), amino pentalene, amino azulenes (ア ミ ノ ア ズ レ Application), amino heptalene (ア ミ ノ ヘ プ タ リ Application) etc. condenses binary lopps amines, aminofluorene, amino-aminofluorene amine compounds such as 9-phenyl fluorenes, amino anthracene (ア ミ ノ ア Application ト ラ レ Application), the amino methyl anthracene, amino dimethylanthracene, the aminophenyl anthracene, amino-9, anthracene amine compounds such as 10-dihydroanthracene, amino luxuriant and rich with fragrance, amino-1, the 7-dimethylphenanthrene, luxuriant and rich with fragrance amine compounds such as amino retene, the aminobphenyl support, amino-s-indacene (ア ミ ノ-s-イ Application ダ セ Application), amino-as-benzo two indenes (ア ミ ノ-as-イ Application ダ セ Application), amino acenaphthene, amino acenaphthene (ア ミ ノ ア セ Na Na Off テ Application), amino non-that alkene etc. condenses the three-membered ring amine compound, amino naphthonaphthalene, amino bend (ア ミ ノ Network リ セ Application), amino pyrene, amino benzophenanthrene, amino benzanthracene, amino aceanthrylene, amino aceanthrene, the luxuriant and rich with fragrance alkene of amino vinegar, amino vinegar phenanthrene, amino firefly anthracene, amino seven days of the week alkene (ア ミ ノ プ レ イ ア デ Application) etc. condense the four-membered ring amine compound, amino pentacene, amino pentaphene, amino picene, amino perylene, ADP and anthracene, amino BaP, amino cholanthrene etc. condenses the five-membered ring amine compound, and is amino cool, amino pyranthrene, amino violanthrene (ア ミ ノ De オ ラ Application ト レ Application), amino isoviolanthrene, amino ovalene etc. condenses the amines of polynary lopps (more than the hexatomic ring) etc.

Particularly preferred urea compounds, in general formula [1], R ₁, R ₃Be the alicyclic alkyl of carbon number 6～19 or the aromatic hydrocarbyl of carbon number 6～12, R ₂Be 4, the allophanamide of 4 '-methylene diphenyl isocyanate or toluene di-isocyanate(TDI).Lubricant composition of the present invention, owing to containing extreme pressure agent, therefore preferred the use as above-mentioned alicyclic ring/aromatic system allophanamide is owing to the less water-thickening agents of influence such as softening or curing of the lubricating grease that causes for extreme pressure agent.

In the lubricating grease, as must adding extreme pressure agent by composition.As adding quantity, be preferably 0.1～10 quality % of lubricating grease total amount.When being lower than 0.1 quality %, obtain owing to add the effect that causes, and add when surpassing 10 quality %, effect is saturated.Preferred adding quantity, 0.5～7 quality % for the lubricating grease total amount most preferably is 0.5～5 quality %.

As extreme pressure agent, can use solid lubricants such as molybdenum disulfide.Solid lubricant is the stratiform lattice structure, becomes lamelliform easily owing to sliding and cuts off, and can prevent Metal Contact.

In addition, organic molybdenum is adsorbed in the metal covering as rotation surface, forms to be imbued with reactive covering film (reaction rete), even under high loading, low-speed conditions, also can improve non-flame property, anti-loading, wear resistance performance.As organic molybdenum, the amine complex of preferred molybdenum dithiocarbamate, molybdenum etc., wherein,, therefore preferred because the effect of molybdenum dithiophosphate (Mo-DTP) is higher.

Same have dialkyl dithiophosphoric acid metallic salt, dialkyldithiocarbamacompositions metallic salt, naphthoic acid salt etc. as the organometallic compound that forms the reaction rete, as required, can also share them.As the dialkyl dithiophosphoric acid metallic salt, preferably each alkyl is C ₄～～C ₂₀The dialkyl dithiophosphoric acid slaine, for example, DMDS for Zinc phosphate, butyl iso-octyl zinc dithiophosphate, two (4-methyl-2-amyl group)-zinc dithiophosphate, two (tetrapropylene benzene base)-zinc dithiophosphate, 2-ethyl-1-hexyl zinc dithiophosphate, iso-octyl zinc dithiophosphate, ethylphenyl zinc dithiophosphate, diamyl disulfide for Zinc phosphate, dihexyl zinc dithiophosphate or as metal except above-mentioned zinc, also have lead, cadmium, antimony etc.

As the dialkyldithiocarbamacompositions metallic salt, preferably each alkyl is C ₄～～C ₂₀The dialkyldithiocarbamacompositions slaine, for example, zine dimethyldithiocarbamate, butyl iso-octyl zinc dithiocarbamate, two (4-methyl-2-amyl group)-zinc dithiocarbamate, two (tetrapropylene benzene base)-zinc dithiocarbamate, 2-ethyl-1-hexyl zinc dithiocarbamate, iso-octyl zinc dithiocarbamate, zinc-ethylphenyl dithiocarbamate, diamyl disulfide for carbaminate, dihexyl zinc dithiocarbamate or as metal except above-mentioned zinc, also have lead, cadmium, antimony, nickel, iron etc.

In addition, as extreme pressure agent, can also use polytetrafluoroethylene (PTFE).Because the cohesion energy of teflon is compared less with other polymeric compound, and critical interfacial tension is very low, therefore because the polytetrafluoroethylgranule granule that sliding parts exists becomes small thin slice because of slip causes shearing stress, easily, give the sliding parts excellent lubrication thus to material (Xiang Shoucai) diffusion on the opposite of sliding parts.Wherein, preferred molecular weight is the teflon of several thousand～hundreds of thousands.

In the lubricating grease, as required, can also contain the additive that the additive of anti-loading the, antioxidant, rust preventing agent, rust resisting compound etc. generally add in lubricating grease.Its adding quantity preferably adds up to below the 10 quality % of lubricating grease total amount.

In addition, lubricating grease is in order to ensure the flowability of appropriateness, and therefore preferred mixed denseness is 220～340.More preferably 250～310, most preferably be 260～290.

Embodiment

Embodiment 1～3, comparative example 1～2

The as shown in table 1 mixing, preparation test lubricating grease.In addition, the allophanamide of water-thickening agent is shown in the general formula [1], and the adding quantity of extreme pressure agent is any all to be 3 quality % of lubricating grease total amount, in addition, in embodiment 2,3 and comparative example 2, adds to add up to 3 quality % whenever amount separately.Then, with each test lubricating grease, be sealing into the gap of the interior perimembranous of the peripheral part of interior axle of steering equipment of structure as shown in Figure 1 and outer shaft, at room temperature, the joint angle is fixed as 30 °, and the mutual application of force (going into power) about sense of rotation makes it flexible at axle direction repeatedly.Measure interior acceleration of the telescopic shaft of this moment, whether evaluation is blocked with moment of torsion and is changed.

To whether block or the moment of torsion change based on such measurement result, be summarized in table 1.

Table 1

	Embodiment 1	Embodiment 2	Embodiment 3	Comparative example 1	Comparative example 2
						The water-thickening agent kind	Allophanamide	Allophanamide	Allophanamide	The Li soap	Allophanamide
Amounts of thickener (quality %)	20	15	27	10	13
						The base oil kind	Ester oil	PAO	Mineral oil	Mineral oil	Mineral oil
Base oil kinematical viscosity (mm 2/ s,, under 25 ℃)	62	93	210	230	230
						Extreme pressure agent (quality %)	MoDTP	MoDTP ZnDTP MoDTC	MoS 2 MoDTP	-	MoS 2
Whether block/the moment of torsion change	Do not have	Do not have	Do not have	Have	Have

PAO: poly-alpha-olefin, MoDTP: molybdenum dithiophosphate, MoS ₂: molybdenum disulfide,

MoDTC: molybdenum dithiocarbamate, ZnDTP: zinc dithiophosphate

Embodiment 4～9, comparative example 6

The as shown in table 2 mixing, preparation test lubricating grease is sealing into the gap of the interior perimembranous of the peripheral part of the interior axle of the steering equipment of structure as shown in Figure 1 and outer shaft.In addition, for the kind of water-thickening agent, comparative example 6 is the urea compounds of general formula [1] expression, R ₂Be 4,4 '-methylene diphenyl isocyanate is represented R in the table ₁, R ₃And ratio.And, when carrying out 100～50 ℃ temperature cycles, the joint angle is fixed as 30 °, make that mutual the rotation applies moment of torsion about rolling disc, make it carry out 100,000 circulations repeatedly and slide.Measure the acceleration of the telescopic shaft outer radius portion of this moment, estimating frictional force has no change.Acceleration is big more just to show the state that slides of taking place more, with situation about recurring more than the 0.5G as change in friction force has taken place.The result is charged to table 2 in the lump.

Table 2

	Embodiment 4	Embodiment 5	Embodiment 6	Embodiment 7	Embodiment 8
						The water-thickening agent kind	Ring	10	Ring/virtue=7/3	Virtue 10	Ring/virtue=5/5	Ring/virtue=3/7
Amounts of thickener (quality %)	20	13	30	19	25
						The base oil kind	Ester oil	Ester oil	Ester oil	Ester oil	Ester oil
Base oil kinematical viscosity (mm 2/ s is under 25 ℃)	60	90	20	100	150
						Extreme pressure agent (quality %)	MoDTP(2)	MoDTP(2) ZnDTP(0.5) MoDTC(1.5)	MoS2(1) MoDTP(1)	MoDTP(1)	MoDTP(2) MoS 2(0.5)
Have or not the generation change in friction force	Do not have	Do not have	Do not have	Do not have	Do not have

	Embodiment 9	Comparative example 6
			The water-thickening agent kind	Ring/virtue=8/2	Ring 10
Amounts of thickener (quality %)	20	20
			The base oil kind	Ester oil	Ester oil
Base oil kinematical viscosity (mm 2/ s is under 25 ℃)	130	60
			Extreme pressure agent (quality %)	MoDTP(0.5)	-
Have or not the generation change in friction force	Do not have	Have

Ring: alicyclic urea, virtue: the aromatic system urea, fat: the aliphatic urea,

MoDTP: molybdenum dithiophosphate, MoS ₂: molybdenum disulfide, MoDTC: molybdenum dithiocarbamate, ZnDTP: zinc dithiophosphate, ZnDTC: zinc dithiocarbamate

Embodiment 10

In the general formula [1] as the R of allophanamide ₁, R ₃Alicyclic alkyl, R ₂Be 4, the combined amount of 4 '-methylene diphenyl isocyanate is mixed to polyatomic alcohol polybasic alcohol ester oil in the above-mentioned allophanamide as base oil, and adds a certain amount of MoDTP preparation test lubricating grease.In addition, mixing consistency is 250～310.Then, be sealing into the gap of the interior perimembranous of the peripheral part of interior axle of steering equipment of structure as shown in Figure 1 and outer shaft, at room temperature, the joint angle be fixed as 30 °, make that mutual the rotation applies moment of torsion about steering wheel, carry out 40 circulations repeatedly and slide.The slip number of times that counting this moment, feel arrived, with 0 time as evaluation score 5 minutes, 1～2 time as evaluation score 4 minutes, 3～4 times as evaluation score 2 minutes, 5～10 as evaluation score 2 minutes, more than 11 times as 1 minute five-stage evaluation of evaluation score.With evaluation score more than 3 minutes as qualified.With result's mapping as shown in Figure 8.

Embodiment 11

With polyatomic alcohol polybasic alcohol ester oil as base oil, R in wherein mixing a certain amount of general formula [1] ₁, R ₃Be alicyclic alkyl, R ₂Be 4, the allophanamide of 4 '-methylene diphenyl isocyanate, and the adding quantity of change MoDTP adds preparation test lubricating grease.In addition, mixing consistency also is 270.Estimate equally with embodiment 11 then.With result's mapping as shown in Figure 9.

Embodiment 12

In the different polyatomic alcohol polybasic alcohol ester oil of kinematical viscosity, add R in a certain amount of general formula [1] respectively ₁, R ₃Alicyclic alkyl, R ₂Be 4, the allophanamide of 4 '-methylene diphenyl isocyanate and MoDTP, preparation test lubricating grease.In addition, mixing consistency all is 270.Estimate equally with embodiment 11 then.With result's mapping as shown in figure 10.

From the foregoing description and comparative example, as can be known: will contain the kinematical viscosity 210mm under 25 ℃ according to the present invention ²Base oil that/s is following and extreme pressure agent grease-enclosed, can suppress to block or the generation of moment of torsion change, and, static friction and kinetic friction poor of telescopic shaft when sliding can be reduced, suppress the variation of frictional force, can prevent steering sense (sense of the behaviour snake) variation that causes by slip.

Though describe the present invention in detail with reference to specific mode of execution, do not break away from aim of the present invention and scope and can carry out various variations or modification, be obvious to those skilled in the art.In addition, the application is based on the Japanese patent application (spy is willing to 2004-381077) of application on December 28th, 2004, the Japanese patent application (the special 2005-13187 of hope) of application on January 20th, 2005, and its content is introduced as reference here.

Claims (5)

1. telescopic shaft, male axle is chimeric in the mode that can't rotate and can be free to slide with female axle, and the peripheral part of described male axle and described female interior perimembranous transmitting torque when contacting with each other and rotate is characterized in that:

To contain extreme pressure agent and the kinematical viscosity under 25 ℃ is 10mm ²/ s is above, 210mm ²The grease-enclosed gap between the interior perimembranous of described male peripheral part and described female axle of the base oil that/s is following,

Described lubricating grease comprises ester oil as described base oil, and

Described lubricating grease contains urea compounds as water-thickening agent, and it is represented by following Chemical formula 1

[Chemical formula 1]

Wherein, R ₁, R ₃Be the alicyclic alkyl of carbon number 6～19 or the aromatic hydrocarbyl of carbon number 6～12, R ₂The fragrant same clan alkyl of expression carbon number 6～15.

2. telescopic shaft according to claim 1 is characterized in that:

The urea compounds as water-thickening agent that described lubricating grease contains is more than the 5 quality % of lubricating grease total amount, below the 35 quality %.

3. according to any one described telescopic shaft of claim 1 to 2, it is characterized in that:

Described lubricating grease contains the described extreme pressure agent of amount of 0.1～10 quality % of promising lubricating grease total amount.

4. telescopic shaft according to claim 3 is characterized in that:

Described lubricating grease contains organic molybdenum as described extreme pressure agent.

5. telescopic shaft according to claim 2 is characterized in that:

Described lubricating grease has 250 to 310 mixed denseness.

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