CN101002005A - Bearing for locker arm - Google Patents
Bearing for locker arm Download PDFInfo
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- CN101002005A CN101002005A CNA2005800264009A CN200580026400A CN101002005A CN 101002005 A CN101002005 A CN 101002005A CN A2005800264009 A CNA2005800264009 A CN A2005800264009A CN 200580026400 A CN200580026400 A CN 200580026400A CN 101002005 A CN101002005 A CN 101002005A
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- Prior art keywords
- raceway
- rocking arm
- qni
- bearing
- rocker bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
- F01L1/146—Push-rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/181—Centre pivot rocking arms
- F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2301/00—Using particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L2305/00—Valve arrangements comprising rollers
- F01L2305/02—Mounting of rollers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rolling Contact Bearings (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
A bearing (50) for a locker arm, comprising a shaft (2) which is an inner ring fixed to the locker arm (1) interposed between the valve (9) and the cam (6) of an engine and controlling intake and exhaust, an outer ring (4) positioned on the outside of the inner ring (2) and coming into contact with the cam (6), and a plurality of needle rollers (3) positioned between the outer ring (4) and the inner ring (2). The outer ring (4) comprises a nitrogen enriched layer, and the grain number of austenitic crystal grains in the nitrogen enriched layer comes within a range exceeding No. 10, and micro recessed dents are formed, at random, in the outer surface (4a) of the outer ring.
Description
Technical field
The bearing that is used for rocking arm when the present invention relates to be used for the suction valve of opening/closing motor car engine or outlet valve.Specifically, the rocker bearing that the present invention relates to has the long life-span aspect peeling off.
Background technique
The method of known raising automobile running milimeter number is to adopt rolling bearing in a rocking arm, and forms contact between the Outer cylindrical circumference of roller raceway and the engine cam outside, to reduce the friction that the valve train of gearings is produced.If use bearing to come opening/closing engine intake valve and outlet valve, then adopt the rolling bearing of full complete set type to be used for nearest rocker bearing.The rolling bearing of full complete set type now is generally used in the application of high speed and high loading.Especially, in so not having the full complete set type rolling bearing of bearing cage, interference can occur between the roller, and/or the location of roller can not be successfully controlled, the inclination that causes producing roller.In addition, oiling agent can not successfully be fed in the bearing, causes the incident of oil starvation.This will bring out the heat of produce sliding, local contact pressure rise, lubricated insufficient or the like.Although this bearing has big bearing capacity and expection has enough phases in longevity for the desired life-span according to digital calculation, but damage on surface (peel off, the layering of surface blur, surperficial initial type comes off etc.) and/or coming off of internal start type are just taken place in short life cycle, thus, bearing can not be brought into play function more suitably.
The roller raceway forms in the application that contacts of rolling with cam outside, rocker bearing when being used for the suction valve of opening/closing motor and outlet valve, traditionally, people's attention concentrates on the excircle part of outer roller raceway, and the research and development of implementing are at the improvement of excircle part.For example, we know, sequentially provide the one deck with residual stress by methods such as shot-peenings from the surface to inside, contain one deck of retained austenite, and one deck that hardens (referring to the open No.2-168022 (patent documentation 1) of Japan Patent).
Patent documentation 1: the open No.2-168022 of Japan Patent
Summary of the invention
The problem that remains the present invention's solution
In all parts of motor, cam part has the state of oil starvation.Owing to the rotational velocity of the outer raceway of bearing changes and owing to the reason work loads of cam structure changes suddenly, absolute rolling motion can not be arranged, so form the contact that has slip.In addition, require that higher speed is arranged, less size and higher stress, make parts place a harsher Environmental Conditions.Therefore, such problem occurs, even stand above-mentioned various measure, the exterior cylindrical surfaces of rocker bearing also can present peels off damage.The purpose of this invention is to provide a rocker bearing, it outer raceway that comprises has suppressed to peel off damage more reliably under the situation of harsh like this user mode.
The method that addresses this problem
Rocker bearing of the present invention comprises one corresponding to the axle that is fixed on the interior raceway on the rocking arm, and described rocking arm is inserted between an engine valve and the cam to adjust air inlet and exhaust; The one outer raceway that is positioned at described raceway outside and contacts with described cam; And a plurality of outside described rolling element between raceway and the interior raceway.Outer raceway comprises a nitrogen enriched layer.The size of grain number of austenite matrix particle is in surpassing the scope of No.10 in the nitrogen enriched layer.Little depression is cheated on the surface of the Outer cylindrical circumference that is formed on outer raceway randomly.
According to a further aspect in the invention, rocker bearing of the present invention comprises one corresponding to the axle that is fixed on the interior raceway on the rocking arm, and described rocking arm is inserted between an engine valve and the cam to adjust air inlet and exhaust; An and outer raceway that is positioned at raceway outside and contacts with cam.In this rocker bearing, outer raceway comprises a nitrogen enriched layer.The size of grain number of austenite matrix particle is in surpassing the scope of No.10 in the nitrogen enriched layer.Little depression is cheated on the surface of the Outer cylindrical circumference that is formed on outer raceway randomly.This rocker bearing is the type that does not have a rolling element, and interior raceway and outer raceway form direct sliding contact.
The little depression hole that is formed on randomly on the Outer cylindrical circumferential surface of outer raceway is set like this, as surface roughness parameter value R
Qni(ISO international standard) when representing, axial surface roughness R
Qni(L) to circumference surface roughness R
Qni(C) ratio, that is, and R
Qni(L)/R
Qni(C), mostly be 1.0 most, surface roughness parameter value Sk mostly is-1.6 most.
Utilize above-mentioned structure, the generation that can suppress to peel off an and long life-span is arranged.As used herein, R
QniRepresentative is corresponding to the r.m.s. roughness R of JIS
q(the former RMS).Peak value Z traverses a reference length l along the x direction
rMeasure, therefore, surface roughness can be by following formula R
q=((l/lr) ∫ Z
2(x) dx)
1/2Obtain.Integration ∫ is integrated to l from zero reference position
rR
Qni(L) in axial direction get above-mentioned reference length.R
Qni(C) along the circumferential direction get reference length, that is, and the circumferencial direction of the exterior cylindrical surfaces of the outer raceway in edge.Compare R
Qni(L)/R
Qni(C) be 1.0 and mean along the circumferencial direction of Outer cylindrical girth that less than 1.0 big sink and outstanding arranged.For example, it shows along axial direction and forms a groove.This axial sulculus is used as Yi Youyan, is formed on the exterior cylindrical surfaces of outer raceway to impel oil film.
The skewness degree of the distribution curve that sink and give prominence to of surface roughness parameter Sk presentation surface.Sk value such as the such symmetrical distribution of Gauss (Gaussian) distribution is 0.The Sk value is corresponding to the irregularity Rsk (irregularity Sk) according to the roughness curve of JIS, and defined by following equation:
Rsk＝(l/R
q 3)×〔(l/l
r)∫Z
3(x)dx〕
Integration ∫ is integrated to l from the zero position of reference
rWhen surface roughness parameter Sk got negative value, the surface structure was corresponding to an outstanding situation with flat-top of band fillet, and a plurality of such inversion U-shaped is provided with the depression of the acute angle between all giving prominence to continuously.(for the purpose of reference, when the Sk value be on the occasion of the time, surface structure is corresponding to the turn up the soil situation of location of anxious steep outstanding each interval, make the U-shaped depression between anxious steep outstanding between).Along the circumferential direction with axial direction parameter S k is set at and mostly is-1.6 mean value most, then the structure of surface depressions and the state that will advantageously become by handling that distributes form an oil film.
Effect of the present invention
Can understand that from above description rocker bearing of the present invention provides one to comprise that one can suppress to peel off the rocker bearing of the outer raceway of damage.
Brief description of drawings
Fig. 1 illustrates one and comprises the rocking arm of rolling bearing according to an embodiment of the invention.
Fig. 2 is the sectional view along the line II-II intercepting of Fig. 1.
Fig. 3 illustrates the rocking arm of rolling bearing according to an embodiment of the invention that comprises of another type.
Fig. 4 illustrates the rocking arm of rolling bearing according to an embodiment of the invention that comprises of a type in addition.
Fig. 5 is the enlarged view of the rolling bearing part of Fig. 4.
Fig. 6 representative is applied in the interior raceway of rolling bearing of the present invention, outer raceway and the rolling element the heat treated figure at least one.
Fig. 7 representative is applied in the interior raceway of rolling bearing of the present invention, outer raceway and the rolling element the heat treated figure of Fig. 6 remodeling at least one.
Fig. 8 A represents the austenite particle (microstructure) of roller bearing component of the present invention.
Fig. 8 B represents the austenite particle (microstructure) of conventional rolling bearing parts.
Fig. 9 A representative is based on the border of the austenite particle of Fig. 8 A schematic form.
Fig. 9 B representative is based on the border of the austenite particle of Fig. 8 B schematic form.
On behalf of the Sk value at outer raceway face place of the bearing of a bearing of the present invention and a conventional example, Figure 10 distribute and R
QniDistribute.
Figure 11 represents the depression along the circumferential direction at the outer raceway face place that is arranged in example of the present invention and the example of outstanding figure.
Figure 12 represents the oil film formation rate of the outer raceway of the present invention.
Figure 13 represents the oil film formation rate of the outer raceway of tradition.
The description of label
1 rocking arm
Raceway (Roller Shaft) in 2
3 needle rollers (rolling element)
4 outer raceways (roller)
The Outer cylindrical circumferential surface of the outer raceway of 4a
5 pitman arm shafts (rotatingshaft)
6 cams
7 adjust screw
8 locking nut
9 valves
10 springs
Raceway supporting in 14
19 bearing metals
20 drive rollers
21 Guide rollers
22 (3/4) " ball
31 rolling fatigue life test sample
50 rocker bearings
52 are encased in the interior raceway in the rolling fatigue life testing machine
53 needle rollers
54 are encased in the outer raceway in the rolling fatigue life testing machine
55, the counterweight loaded members of 56 rolling fatigue life testing machines
TI carbon nitrification temperature
T2 quenching heat treatment temperature
Embodiment
Embodiments of the invention are described below with reference to accompanying drawings.With reference to Fig. 1 and 2, the rocking arm 1 that is designated a swinging member is rotatably supported on the pitman arm shaft (rotatingshaft) 5 of central area by a bearing metal 19 grades.The other end 1b of rocking arm 1 screws on and one adjusts screw 7.It is fixing to adjust screw 7 usefulness one locking nut 8.The lower end of adjusting screw 7 abuts against the upper end of a valve 9, and this valve can be the suction valve or the outlet valve of an internal-combustion engine.Valve 9 is by the elastic force-applying of spring 10.
Constitute interior raceway 2, the rolling element of needle roller 3 and the rolling bearing that outer raceway 4 is used as the full complete set type that is used for a rocking arm of rolling bearing.In general, the rolling bearing that does not have a bearing cage is referred to as the rolling bearing of full complete set type.Owing to contact with cam 6 formation when the rolling bearing of the above-mentioned full complete set type of rocking arm rolls, so the pushing force of cam 6 and momentum effect are outside on the raceway 4.According to the engine rocker of the embodiment of the invention is one to comprise the member of the full complete set type rolling bearing of above-mentioned rocking arm, and interior raceway 2 is not limited to a quill shaft, also can be a solid shaft.
In addition, can use the sliding bearing that does not have needle roller to replace comprising the said structure of a rolling element (that is a needle roller).In other words, can use the bearing of such type, wherein, interior raceway passes through corresponding to the axle of interior raceway and the direct contact between the outer raceway forms and the sliding contact of outer raceway, and does not have needle roller.In this case, rocker bearing can be done compactly, because the parts that need are less, so, can realize alleviating of weight economically.
Parameter S k and R
QniMethod of measurement and condition can be illustrated in the following stated.In the time will measuring according to the raceway of the composed component of rolling element and rolling bearing by the surperficial aspects of these parameters representative, can obtain measured value from both sides respect to one another along diametric(al), but the measured value that a side obtains can be seen a reliable typical value as.
Calculation of parameter standard: JIS B 0601:1994 (SURFCOM, JIS 1994)
Block type: Gauss
Measure length: 5 λ
Cut-off wavelength: 0.25mm
Measure and amplify: * 10000
Measuring speed: 0.30mm/s
Measuring point: roller centre zone
Measure number: 2
Measuring device: surface roughness measurement device SURFCOM 1400A (TOKYO SEIMITSU CO., LTD.)
Now engine rocker bearing is according to another embodiment of the present invention described with reference to Fig. 3.One rocking arm rolling bearing 50 comprises an axle 2 corresponding to interior raceway, and this axle traverses two sidewalls and is fixed on an interior raceway hole (not shown), and it forms unlimited between end 1b of rocking arm 1 and the other end 1a.One end of engine valve 9 abuts against an end 1b.One pivot (not shown) is fitted in the other end 1a.The rocking arm 1 that has a pivot hole 15 is pushed by spring 10 along a predetermined direction around pivot, and accepts the driving force of cam 6 transmission of the roller 4 of raceway outside constituting, so that resist the pushing force movement of valve 9 of described spring.
Now engine rocker is according to another embodiment of the present invention described with reference to Figure 4 and 5.With reference to Fig. 4, a rotatingshaft 5 is arranged on the center region of rocking arm 1, so that rocking arm 1 rotates around rotatingshaft 5.Rocking arm 1 makes one end 1b abut against an end of engine valve 9, and the other end 1a abuts against an end of an interlocking lever 16.The function of adjusting screw 7 is the adjoining position of adjusting between rocking arm the other end 1a and the interlocking lever 16.
One rocking arm rolling bearing (rolling bearing of the full complete set type of rocking arm) 50 is attached to a hollow bearing annex 16a who is positioned at interlocking lever 16 lower ends by an attachment member 17.Cam 6 abuts against the outer raceway 4 of rolling bearing of full complete set type so that driving force is delivered to interlocking lever.
The outer raceway 4 of the rocker bearing shown in Fig. 3,4 and 5 has nitrogen enriched layer, austenite matrix particle, and the setting of surface roughness is similar to the roughness among Fig. 1 and 2 embodiment.In order to give the structure of outer raceway 4 nitrogen enriched layers on the microcosmic, cause the size of grain number of austenite size of grain to surpass No.10, the Qa heat treatment that can use a low temperature, it will be described hereinafter.In addition, little depression is cheated on the surperficial 4a of the Outer cylindrical girth that is formed on outer raceway 4 randomly.Handle like this on the surface: as surface roughness parameter value R
Qni(ISO international standard) when representing, axial surface roughness R
Qni(L) to circumference surface roughness R
Qni(C) ratio, that is, and R
Qni(L)/R
Qni(C), mostly be 1.0 most, surface roughness parameter value Sk mostly is-1.6 most.
Below description is included in the heat treatment that applies the carbon nitrification on the outer raceway (roller) of above-mentioned rocker bearing.Fig. 6 representative is based on the heat treatment figure of carrying out primary quenching and Qa method.Fig. 7 representative is based on someway heat treated figure, this method in the Quenching Treatment process with material cooled to being lower than transition temperature point A1, then, be heated to final enforcement quenching once more.The both is embodiments of the invention.In these figure, carbon and nitrogen are diffused in the mother metal of steel, and carbon is dissolved fully, are cooled to a transition point that is lower than the A1 that handles T1 thereafter.Then, handling the T2 place, applying heating once more, carrying out oil quench thereafter at the temperature place that is lower than processing T1.
According to above-mentioned heat treatment, improved the ability of cracking resistance, and reduced size distortion rate slowly, but the surface layer of the outer raceway of rocker bearing has stood the carbon nitrification, has replaced common quenching, that is, replaced just after the carbon nitrification, carrying out once more quenching.According to above-mentioned heat treatment method, can obtain the structure of a microcosmic, wherein, the size of grain of austenite matrix particle is reduced to 1/2 of traditional size at least.Standing above-mentioned heat treated outer raceway can manifest long life-span, the cracking resistance ability of raising aspect the rolling contact fatigue characteristic, and the lower rate of size distortion slowly.
The outer raceway of describing bearing with reference to Fig. 8 A, 8B, 9A and the 9B microstructure of austenite particle especially below.According to these structures that show the austenite matrix particle, according to the size of grain number of JIS, the austenite size of grain of conventional example mostly is No.10 most.By using heat treatment method of the present invention, can obtain corresponding to the size of grain number is 12 granule.According to the result that intercept method is measured, the mean particle size of Fig. 9 A is 5.6 μ m.
The method that forms above-mentioned dolly dimple hole will be described below.The dolly dimple hole forms with the gyro-finishing method.Can reach desirable surperficial aspect by the rotating speed of selecting buffing machine suitably, the time of processing, the quantity of putting into product, chip type, size or the like.Also can adopt the method for shot-peening etc.
With reference to Figure 10 the axial and circumferential R of the exterior cylindrical surfaces of the outer raceway of bearing of one example according to the present invention that forms with said method is described below
QniAnd surface roughness parameter value Sk.For the purpose of comparison, Figure 10 has also shown the survey data corresponding to a conventional example.A feature is, the absolute value of Sk of getting negative value in example of the present invention greater than in traditional example.Another feature is R
QniThe position that is distributed in quite greater than zero have a peak value, its representative forms has a mind to little depression and outstanding.As shown in figure 11, comprise the outstanding of rounding with said method along depression and the outstanding figure that the circumferencial direction of the exterior cylindrical surfaces of the outer raceway of the bearing of one example according to the present invention forms, the outstanding dark sharp-pointed groove that has between all giving prominence to, it is corresponding to the Sk value that is at most-1.6.
Below with reference to Figure 12 and 13 describe when comprise above-mentioned outside the test bearing of embodiment according to the present invention of raceway be encased in be positioned at when testing in the real engine outside the oil film formation rate at exterior cylindrical surfaces place of raceway.From between them more as can be known, example of the present invention oil film formation rate when start-up function has improved about 20% with respect to comparative example.
(example 1)
An example of the present invention will be described here.Use the SUJ2 of JIS to produce the fragment that peels off of test.It is L12 that the outer diameter that the test fragment has is of a size of the 40mm width.Each test bearing is processed as described below.
Testpieces No.1 (example of the present invention): 850 ℃ of 150 minutes endurance of carbon nitrification temperature.Use the gas of RX gas and ammonia to mix atmosphere.Come into effect primary quenching from 850 ℃ carbon nitrification temperature.Then, continue heating and reach 20 minutes being lower than under 800 ℃ the temperature of Qa carbon nitrification temperature, continue 90 minutes 180 ℃ of following tempering thereafter.Then, the gyro-finishing method by the surface treatment special use obtains desired polished surface.
Testpieces No.2 (comparative example 1): carry out common heat treatment and (in the RX atmosphere,, quench thereafter 20 minutes following durations of heat of heating-up temperature of 840 ℃.Then, implement tempering down at 180 ℃ and reach 90 minutes).
Testpieces No.3 (comparative example 2): carry out the carbon nitrification and (in the mixed gas atmosphere of RX gas and ammonia, reach 150 minutes the following duration of heat, thereafter from 850 ℃ of quenchings 850 ℃ heating-up temperatures.Then, implement tempering down at 180 ℃ and reach 90 minutes).
Material inspection and on the testpieces that forms with above-mentioned processing method, carry out the results are shown in table 1 and 2 of spalling test.
Table 1
| Testpieces numbering No. | Austenite matrix size of grain (JIS) | Retained austenite (percent by volume) | Nitrogen content (weight percentage) | Peel off | Annotate | |
| 1 | 12 | 21 | 0.30 | 7.2 | Example 1 of the |
|
| 2 | 9 | 7 | 0 | 1 | Comparative example 1 | |
| 3 | 8 | 29 | 0.31 | 1.4 | Comparative example 2 |
Table 2
| Testpieces numbering No. | Surface treatment on the exterior cylindrical surfaces of outer raceway (gyro-finishing) | Rqni(μm) | Rqni (L)/Rqni (C) (mean value) | The Sk value | | |
| L | C | |||||
| 1 | Be | 0.09～ 0.16 | 0.10～ 0.16 | 0.7～1.0 | -1.6～-2.3 | Example 1 of the |
| 2 | Not | 0.04～ 0.06 | 0.03～ 0.05 | 1.0～1.5 | -0.8～-1.2 | Comparative example 1 |
| 3 | Not | 0.04～ 0.06 | 0.03～ 0.05 | 1.0～1.5 | -0.8～-1.2 | Comparative example 2 |
Below the spalling test method will be described.The spalling test condition is as described in Table 3.
Table 3
The spalling test condition
| Testing machine | 2-cylinder |
| Testpieces | |
| 40 vertical bars | |
| The testpieces of pairing | 40 * R60 surface roughness (Rt), 3.0 μ m (producing) by SUJ2 |
| Contact pressure | P max2.3GPa |
| Oiling agent | Turbine oil VG46 |
| The rotating speed of paired experiment part | 2000rpm (testpieces is rolled by follower) |
| Total loading counting | 4.8×10 5Inferior |
The Conventional Heat Treatment product of the SUJ2 with coarse surface roughness that forms with JIS is used as the testpieces of pairing.Each above-mentioned testpieces is rollably contacted with the testpieces of pairing, and measurement occur on the testpieces area ratio that peels off (assembling trickle thin slice).This area ratio is looked at as and peels off intensity.Peeling off strength ratio is that the inverse of ratio of the testpieces No.2 of 1 (reference value) is represented with the result of each testpieces with standing Conventional Heat Treatment.The testpieces No.1 of example of the present invention shows peel off that intensity is at least the testpieces No.2 that stands Conventional Heat Treatment peel off 7 times of intensity, be at least and peel off 5 times of intensity and peel off intensity corresponding to the testpieces No.3 of carbon nitrification product.Life-span improves so significantly should be owing to above-mentioned trickle austenite size of grain, and sink and outstanding surface structure and the improved oil film that forms based on accurate control.
Although described and illustrated the present invention in detail, should be expressly understood that such description just is used for explanation and example, can not see restriction as, the spirit and scope of the present invention are only limited by all clauses of attached claims.
Industrial applicability
The rocker bearing of the application of the invention can improve the anti-strip ability that is in the outer raceway that contacts with cam under the rigor condition widely. Because such one outer raceway of rocker bearing can obtain by the method for implementing secondary quenching and gyro-finishing under the low temperature, can expect might be widely used on the rocking arm and suchlike member of the automobile engine that stands day by day harsh service condition.
Claims (according to the modification of the 19th of treaty)
1. a rocker bearing (50) comprising: one corresponding to the axle (2) that is fixed on the interior raceway on the rocking arm (1), and described rocking arm (1) is inserted between an engine valve (9) and the cam (6) to adjust air inlet and exhaust; The one outer raceway (4) that is positioned at described raceway (2) outside and contacts with described cam (6); And a plurality of rolling elements (3) that are positioned between described outer raceway (4) and the raceway (2),
Wherein, described outer raceway (4) comprises a nitrogen enriched layer, and the size of grain number of austenite matrix particle and comprises that the little depression on the surface (4a) of the Outer cylindrical circumference that is formed on outer raceway randomly cheats in surpassing the scope of No.10 in the nitrogen enriched layer.
2. rocker bearing as claimed in claim 1 (50) is characterized in that, as surface roughness R
QniWhen the parameter value of (ISO international standard) was represented, the described Outer cylindrical circumferential surface (4a) with the outer raceway in the described little depression hole that forms randomly had a R
Qni(L)/R
Qni(C) ratio, it is designated an axial surface roughness R
Qni(L) to circumference surface roughness R
Qni(C) ratio promptly, mostly is 1.0 most, and the surface roughness parameter value of Sk mostly is-1.6 most.
3. rocker bearing as claimed in claim 1 (50), it is characterized in that, described rocking arm (1) is rotatably supported on the rotatingshaft (5) that is positioned between rocking arm one end (1a) and the other end (1b), a described end (1a) comprises the interior raceway supporting member (14) of a bifurcated, raceway (2) is fixed on this supporting member in described, and the described the other end (1b) abuts against an end of described engine valve (9).
4. rocker bearing as claimed in claim 1 (50), it is characterized in that, described rocking arm (1) has first end (1a) that is fitted with a pivot and second end (1b) that abuts against described engine valve (9), and described interior raceway (2) is fixed on described first end (1a) of described rocking arm (1) and two opposing sidewalls places between described second end (1b) by an interior raceway hole.
5. rocker bearing as claimed in claim 1 (50), it is characterized in that; rocking arm (1) is rotatably supported on the rotatingshaft (5) that is positioned between rocking arm first end (1a) and second end (1b); an end of described engine valve (9) abuts against second end (1b); and abut against described first end (1a); the interior raceway (2) of described rocker bearing (50) is fixed to the other end of described interlocking lever (16) from the end that described cam (6) transmits the interlocking lever (16) of stress, and the contacting of outer raceway (4) formation and described cam (6).
6. rocker bearing as claimed in claim 1 (50) is characterized in that, described rocker bearing (50) is the needle bearing of a full complete set type.
7. a rocker bearing (50) comprising: one corresponding to the axle (2) that is fixed on the interior raceway on the rocking arm (1), and described rocking arm (1) is inserted between an engine valve (9) and the cam (6) to adjust air inlet and exhaust; And an outer raceway (4) that is positioned at described raceway (2) outside and contacts with described cam (6),
Wherein, described outer raceway (4) comprises a nitrogen enriched layer, and the size of grain number of austenite matrix particle and comprises that the little depression on the surface (4a) of the Outer cylindrical circumference that is formed on outer raceway randomly cheats in surpassing the scope of No.10 in the nitrogen enriched layer.
8. rocker bearing as claimed in claim 7 (50) is characterized in that, as surface roughness R
QniWhen the parameter value of (ISO international standard) was represented, the described Outer cylindrical circumferential surface (4a) with the outer raceway in the described little depression hole that forms randomly had a R
Qni(L)/R
Qni(C) ratio, it is designated an axial surface roughness R
Qni(L) to circumference surface roughness R
Qni(C) ratio promptly, mostly be 1.0 most, and the surface roughness parameter value of Sk mostly is-1.6 most.
9. rocker bearing as claimed in claim 7 (50), it is characterized in that, described rocking arm (1) is rotatably supported on the rotatingshaft (5) that is positioned between rocking arm one end (1a) and the other end (1b), a described end (1a) comprises the interior raceway supporting member (14) of a bifurcated, raceway (2) is fixed on this supporting member in described, and the described the other end (1b) abuts against an end of described engine valve (9).
10. rocker bearing as claimed in claim 7 (50), it is characterized in that, described rocking arm (1) has second end (1b) of first end (1a) that is fitted with a pivot and an end that abuts against described engine valve (9), and described interior raceway (2) is fixed on first end (1a) of described rocking arm (1) and two opposing sidewalls places between second end (1b) by an interior raceway hole.
11. rocker bearing as claimed in claim 7 (50), it is characterized in that; rocking arm (1) is rotatably supported on the rotatingshaft (5) that is positioned between rocking arm first end (1a) and second end (1b); an end of described engine valve (9) abuts against second end (1b); and abut against described first end (1a); the interior raceway (2) of described rocker bearing (50) is fixed to the other end of described interlocking lever (16) from the end that described cam (6) transmits the interlocking lever (16) of stress, and the contacting of outer raceway (4) formation and described cam (6).
Claims (11)
1. a rocker bearing (50) comprising: one corresponding to the axle (2) that is fixed on the interior raceway on the rocking arm (1), and described rocking arm (1) is inserted between an engine valve (9) and the cam (6) to adjust air inlet and exhaust; The one outer raceway (4) that is positioned at described raceway (2) outside and contacts with described cam (6); And a plurality of rolling elements (3) that are positioned between described outer raceway (4) and the raceway (2),
Wherein, described outer raceway (4) comprises a nitrogen enriched layer, and the size of grain number of austenite matrix particle and comprises that the little depression on the surface (4a) of the Outer cylindrical circumference that is formed on outer raceway randomly cheats in surpassing the scope of No.10 in the nitrogen enriched layer.
2. rocker bearing as claimed in claim 1 (50) is characterized in that, as surface roughness R
QniWhen the parameter value of (ISO international standard) was represented, the described Outer cylindrical circumferential surface (4a) with the outer raceway in the described little depression hole that forms randomly had a R
Qni(L)/R
Qni(C) ratio, it is designated an axial surface roughness R
Qni(L) to circumference surface roughness R
Qni(C) ratio promptly, mostly is 1.0 most, and the surface roughness parameter value of Sk mostly is-1.6 most.
3. rocker bearing as claimed in claim 1 (50), it is characterized in that, described rocking arm (1) is rotatably supported on the rotatingshaft (5) that is positioned between rocking arm one end (1a) and the other end (1b), a described end (1a) comprises the interior raceway supporting member (14) of a bifurcated, raceway (2) is fixed on this supporting member in described, and the described the other end (1b) abuts against an end of described engine valve (9).
4. rocker bearing as claimed in claim 1 (50), it is characterized in that, described rocking arm (1) makes one end (1b) abut against an end of described engine valve (9), and a pivot is fitted on the described the other end (1a), and described interior raceway (2) is fixed on an end (1b) of described rocking arm (1) and two opposing sidewalls places between the other end (1a) by an interior raceway hole.
5. rocker bearing as claimed in claim 1 (50), it is characterized in that; rocking arm (1) is rotatably supported on the rotatingshaft (5) that is positioned between rocking arm one end (1b) and the other end (1a); an end of described engine valve (9) abuts against an end (1b); and abut against the described the other end (1a); the interior raceway (2) of described rocking arm rolling bearing (50) is fixed to the other end of described interlocking lever (16) from the end that described cam (6) transmits the interlocking lever (16) of stress, and the contacting of outer raceway (4) formation and described cam (6).
6. rocker bearing as claimed in claim 1 (50) is characterized in that, described rocker bearing (50) is the needle bearing of a full complete set type.
7. a rocker bearing (50) comprising: one corresponding to the axle (2) that is fixed on the interior raceway on the rocking arm (1), described rocking arm (1) is inserted between an engine valve (9) and the cam (6) to adjust air inlet and exhaust: and one be positioned at outside the described raceway (2) and the outer raceway (4) that contacts with described cam (6)
Wherein, described outer raceway (4) comprises a nitrogen enriched layer, and the size of grain number of austenite matrix particle and comprises that the little depression on the surface (4a) of the Outer cylindrical circumference that is formed on outer raceway randomly cheats in surpassing the scope of No.10 in the nitrogen enriched layer.
8. rocker bearing as claimed in claim 7 (50) is characterized in that, as surface roughness R
QniWhen the parameter value of (ISO international standard) was represented, the described Outer cylindrical circumferential surface (4a) with the outer raceway in the described little depression hole that forms randomly had a R
Qni(L)/R
Qni(C) ratio, it is designated an axial surface roughness R
Qni(L) to circumference surface roughness R
Qni(C) ratio promptly, mostly be 1.0 most, and the surface roughness parameter value of Sk mostly is-1.6 most.
9. rocker bearing as claimed in claim 7 (50), it is characterized in that, described rocking arm (1) is rotatably supported on the rotatingshaft (5) that is positioned between rocking arm one end (1a) and the other end (1b), a described end (1a) comprises the interior raceway supporting member (14) of a bifurcated, raceway (2) is fixed on this supporting member in described, and the described the other end (1b) abuts against an end of described engine valve (9).
10. rocker bearing as claimed in claim 7 (50), it is characterized in that, described rocking arm (1) makes one end (1b) abut against an end of described engine valve (9), and a pivot is fitted on the described the other end (1a), and described interior raceway (2) is fixed on an end (1b) of described rocking arm (1) and two opposing sidewalls places between the other end (1a) by an interior raceway hole.
11. rocker bearing as claimed in claim 7 (50), it is characterized in that; rocking arm (1) is rotatably supported on the rotatingshaft (5) that is positioned between rocking arm one end (1b) and the other end (1a); an end of described engine valve (9) abuts against an end (1b); and abut against the described the other end (1a); the interior raceway (2) of described rocking arm rolling bearing (50) is fixed to the other end of described interlocking lever (16) from the end that described cam (6) transmits the interlocking lever (16) of stress, and the contacting of outer raceway (4) formation and described cam (6).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP228038/2004 | 2004-08-04 | ||
| JP2004228038 | 2004-08-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101002005A true CN101002005A (en) | 2007-07-18 |
Family
ID=35786962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005800264009A Pending CN101002005A (en) | 2004-08-04 | 2005-05-12 | Bearing for locker arm |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20070289566A1 (en) |
| EP (1) | EP1801365A1 (en) |
| JP (1) | JPWO2006013663A1 (en) |
| CN (1) | CN101002005A (en) |
| WO (1) | WO2006013663A1 (en) |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2594339B2 (en) * | 1988-11-09 | 1997-03-26 | エヌティエヌ株式会社 | Cam follower with roller for engine |
| JP2548811B2 (en) * | 1989-11-30 | 1996-10-30 | エヌティエヌ株式会社 | Machine parts |
| JP2634496B2 (en) * | 1991-02-28 | 1997-07-23 | エヌティエヌ株式会社 | Cam follower with roller for engine |
| DE4234868C2 (en) * | 1992-10-16 | 1999-10-28 | Schaeffler Waelzlager Ohg | Process for the production of a rocker arm or rocker arm |
| JP3524978B2 (en) * | 1995-03-02 | 2004-05-10 | 光洋精工株式会社 | Rollers for cam followers |
| US6224688B1 (en) * | 1997-08-18 | 2001-05-01 | Nsk Ltd. | Rolling bearing |
| US6328009B1 (en) * | 1998-12-01 | 2001-12-11 | Competition Cams, Inc. | Valve lifter apparatus |
| JP3728491B2 (en) * | 2000-03-27 | 2005-12-21 | 光洋精工株式会社 | Cam follower |
| JP2003056315A (en) * | 2001-08-22 | 2003-02-26 | Ntn Corp | Roller-equipped cam follower |
| US7438477B2 (en) * | 2001-11-29 | 2008-10-21 | Ntn Corporation | Bearing part, heat treatment method thereof, and rolling bearing |
| JP3987023B2 (en) * | 2001-11-29 | 2007-10-03 | Ｎｔｎ株式会社 | Steel heat treatment method and steel |
| JP2004115903A (en) * | 2002-09-30 | 2004-04-15 | Ntn Corp | Ball screw part and ball screw |
| JP2004183589A (en) * | 2002-12-05 | 2004-07-02 | Nsk Ltd | Cam-follower device |
| JP2004211686A (en) * | 2002-12-17 | 2004-07-29 | Mitsubishi Motors Corp | Valve system for internal combustion engine |
-
2005
- 2005-05-12 CN CNA2005800264009A patent/CN101002005A/en active Pending
- 2005-05-12 EP EP05738624A patent/EP1801365A1/en not_active Withdrawn
- 2005-05-12 JP JP2006531273A patent/JPWO2006013663A1/en active Pending
- 2005-05-12 WO PCT/JP2005/008671 patent/WO2006013663A1/en not_active Application Discontinuation
- 2005-05-12 US US11/659,237 patent/US20070289566A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| US20070289566A1 (en) | 2007-12-20 |
| JPWO2006013663A1 (en) | 2008-07-31 |
| WO2006013663A1 (en) | 2006-02-09 |
| EP1801365A1 (en) | 2007-06-27 |
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