CN100451368C

CN100451368C - Oil lubrication-type rolling bearing device

Info

Publication number: CN100451368C
Application number: CNB200480032112XA
Authority: CN
Inventors: 松山博树; 千叶博行; 北村和久; 山川和芳; 福田登志郎; 百百路博文; 户田一寿
Original assignee: JTEKT Corp
Current assignee: JTEKT Corp
Priority date: 2003-11-07
Filing date: 2004-11-08
Publication date: 2009-01-14
Anticipated expiration: 2024-11-08
Also published as: CN1875199A

Abstract

A tapered roller bearing device has an inner ring (1), an outer ring (2), tapered rollers (3), a retainer (5), and a shielding plate (6). The inner ring (1) has a flange section (1a) in contact with a small diameter end face of a tapered roller (3). The shielding plate (6) is provided so as to be in contact with an end face of the flange section (1a) of the inner ring (1). The shielding plate (6) has a projection section (9) projecting radially more outward than the flange section (1a). The projection section (9) is provided at a position spaced in relation to the retainer (5) in the axial direction of the inner ring (1).

Description

Oil lubrication-type rolling bearing device

Technical field

The present invention relates to a kind of oil lubrication-type rolling bearing device, particularly relate to the oil lubrication-type rolling bearing device in the transmission device etc. of pinion shaft support devices such as a kind of differential gear that is suitable for being arranged on automobile or transaxle, automobile.

Background technique

Existing, as oil lubrication-type rolling bearing device, there is tapered roller bearing shown in Figure 9.This tapered roller bearing uses in automobile and lathe.

This tapered roller bearing is made of following part as shown in Figure 9: inner ring 11; Outer ring 12; Can rollably be configured in the tapered roller 13 in the annulus 14 between inner ring 11 and the outer ring 12; And the retainer 15 that maintains tapered roller 13 around on the direction every predetermined interval.

This tapered roller bearing is supporting radial load and thrust load, that is to say, supports the load from radial direction and axial direction.Though above-mentioned tapered roller bearing can support the load from radial direction and axial direction, and on the other hand, has the big problem of running torque.Therefore, in the application that requires low moment, used ball bearing mostly.

Yet ball bearing is because to compare load bearing capacity little with tapered roller bearing, so, obtain identical load bearing capacity and just the size of bearing must be done greatly, thus the weight increase.Therefore, if passable in bearing the part of big load, the just preferred tapered roller bearing that uses.

Principal element as the running torque of above-mentioned tapered roller bearing, can list: be formed on the lip part 11a on the end of circular cone plane of trajectory orbital path side of inner ring 11 and be formed on lip part 11b on the end of the big footpath of above-mentioned circular cone plane of trajectory orbital side, and the sliding-frictional resistance between end face 13a, the 13b of tapered roller 13.

In addition, as other the principal element of running torque, can list: above-mentioned tapered roller bearing uses in the differential mechanism of automobile or lathe etc. and the stirring resistance of the oil that causes, that is to say that above-mentioned tapered roller bearing makes a large amount of oil flow into the stirring resistance of the oil that uses under the lubricated condition and cause.

As the tapered roller bearing of the stirring resistance that can reduce above-mentioned oil, exist in the spy and open the tapered roller bearing of putting down in writing in the 2004-084799 communique.

This tapered roller bearing with the wall thickness radially of the post portion of retainer along its peripheral direction roughly integral body do thicklyer.Like this, the runner of the lubricant oil between retainer internal surface and the inner ring outer surface is narrowed down, thereby reduce the lubricant oil that flows into bearing inside.

Yet, above-mentioned tapered roller bearing and since its retainer between inner ring and outer ring with high speed rotating, this retainer has the thicker post portion of wall thickness, thereby exists because of service condition makes the stirring resistance of oil and reduce inadequate problem.

As mentioned above, tapered roller bearing has the advantage of high power capacity, and on the other hand, it also has the high defective of running torque.Particularly under situation about being lubricated, exist the running torque that causes because of the stirring resistance to reduce inadequate problem with a large amount of oil.If can reduce running torque greatly, just can especially improve the efficient of machinery or device.In addition, can realize low energy consumptionization, also help improving environmental load.

In view of the foregoing, the requirement that reduces the running torque that is caused by lubricant oil stirring resistance is improved.

Summary of the invention

Therefore, the purpose of this invention is to provide a kind of oil lubrication-type rolling bearing device, it can guarantee to reduce the stirring resistance under the state of load bearing capacity, thereby reduces running torque.

In order to address the above problem, the feature of oil lubrication-type rolling bearing of the present invention is that it has:

Inner ring;

The outer ring;

Be configured in a plurality of rolling elements between above-mentioned inner ring and the outer ring; And

Suppress the oily oil that flow between above-mentioned inner ring and the outer ring and flow into the inhibition parts.

According to the present invention, flow into the inhibition parts by above-mentioned oil, can suppress to be immersed in the oil mass of bearing means inside.Thereby oil can exceedingly not be immersed in the inside of oil lubrication-type rolling bearing device, can reduce the stirring resistance of oil, so, can reduce the running torque of oil lubrication-type rolling bearing device itself.Thereby, can reduce the fuel consume of automobile with oil lubrication-type rolling bearing device of the present invention etc.

In addition, in the oil lubrication-type rolling bearing of a mode of execution,

Above-mentioned rolling element is a tapered roller,

Above-mentioned inner ring is the rotation circle with circular cone plane of trajectory orbital, and above-mentioned outer ring is the retainer ring with circular cone plane of trajectory orbital,

Above-mentioned inner ring has the contacted lip part of path end face with above-mentioned tapered roller,

It is shields that above-mentioned oil flows into the inhibition parts, and this shield has the protuberance of more giving prominence to foreign side radially than above-mentioned lip part,

And, also have the retainer that keeps above-mentioned tapered roller,

Above-mentioned protuberance be configured in respect to above-mentioned retainer above-mentioned inner ring axially on the position of devices spaced apart.

If parts are arranged on the inner ring side of enclosing as rotation, these parts will rotate with running shaft.For this parts that rotate with running shaft are set, those skilled in the art do not think preferably.Therefore, can there be following idea in those skilled in the art: in the inner ring side as the rotation circle shield is set, prevents that oil from flowing in the bearing.Yet the present inventor found through experiments, if in the inner ring side as the rotation circle shield is set, compares with existing tapered roller, can reduce running torque extraordinarily.

According to above-mentioned mode of execution, compare with existing tapered roller, can reduce running torque extraordinarily.Infer this be because: above-mentioned shield is configured in the inner ring side as rotation circle, and above-mentioned shield is rotational structure, so because of the centrifugal force attached to the oil on the shield, these oil splash to foreign side radially, thereby oil is difficult to be immersed in the bearing means.

The external diameter of above-mentioned protuberance is smaller or equal to the internal diameter of the end of the circular cone plane of trajectory orbital path side of above-mentioned outer ring.

According to above-mentioned mode of execution, owing to can guarantee to flow into the required oil of lubricating bearings device, thereby can prevent the sintering of bearing means.

Above-mentioned protuberance and above-mentioned retainer in above-mentioned gap on axially smaller or equal to 3mm.

According to above-mentioned mode of execution, can further reduce the oil that is immersed in the bearing means, thereby can further reduce running torque.

In addition, in the oil lubrication-type rolling bearing of a mode of execution, above-mentioned inner ring and above-mentioned shield form as one.

According to above-mentioned mode of execution, can reduce machining period and assemble man-hour.

Above-mentioned rolling element is a tapered roller,

Above-mentioned oil flows into that to suppress parts are shields, and this shield has than the end of the path side of the circular cone plane of trajectory orbital of above-mentioned outer ring more to radially the outstanding protuberance of interior side,

And, also have the retainer that keeps above-mentioned tapered roller,

Above-mentioned protuberance be configured in respect to above-mentioned retainer above-mentioned outer ring axially on the position of devices spaced apart,

According to above-mentioned mode of execution, can reduce the oil that is immersed in the bearing means, thereby can reduce running torque.

In addition, in the oil lubrication-type rolling bearing of a mode of execution, above-mentioned outer ring and above-mentioned shield form as one.

In addition, in the oil lubrication-type rolling bearing of a mode of execution, the oil that is provided with the oil outflow that promotes to flow between above-mentioned inner ring and the above-mentioned outer ring flows out and promotes structure.

According to above-mentioned mode of execution, flow out and promote structure owing to have above-mentioned oil, thereby can allow the oil that is immersed in bearing means inside promptly flow out to the outside of bearing means.Thereby oil can not be trapped in the inside of oil lubrication-type rolling bearing device, and oil flows out swimmingly, so, the stirring resistance force diminishes of oil can be made, thereby the moment of oil lubrication-type rolling bearing device itself can be reduced.Therefore, can reduce the fuel consume of automobile with oil lubrication-type rolling bearing device of the present invention etc.

Above-mentioned rolling element is a tapered roller,

Above-mentioned oil flows out and promotes that structure comprises following configuration structure: be made as z at the number with tapered roller, the average diameter of tapered roller is made as DW, when the pitch diameter of tapered roller is made as dm, the above-mentioned circular cone that will satisfy the number z of z≤0.85/ (DW/ (π dm)) is configured between above-mentioned inner ring and the outer ring, and the big footpath side that makes this tapered roller is towards oily outflow side.

According to above-mentioned mode of execution, because tapered roller number z is controlled to be smaller or equal to 0.85/ (DW/ (π dm)), the space on the feasible direction around between the tapered roller of adjacency increases, and has increased oily runner, therefore, can promote the outflow of oil.Thereby, can reduce the oil mass of oil lubrication-type rolling bearing inside, can reduce the stirring resistance of oil.

In more detail, according to above-mentioned mode of execution, because the number z of tapered roller is formed smaller or equal to 0.85/ (DW/ (π dm)), so, compare with the common tapered roller bearing in number with tapered roller is set in scope from 0.90/ (DW/ (π dm)) to 0.95/ (DW/ (π dm)), can make the runner that connects the oil in the bearing wideer, thereby can make the oil that enters in the bearing flow out to the outside at an easy rate than common.Thereby the oil mass that helps to produce oily stirring resistance tails off, thereby the moment that is caused by the stirring resistance can be reduced more than or equal to 10%.

Above-mentioned rolling element is a tapered roller,

Above-mentioned oil flows out and promotes that structure comprises: be configured to the circular cone plane of trajectory orbital with the above-mentioned outer ring that contacts with above-mentioned tapered roller more than or equal to 25 ° wrapping angle.

In addition, in this specification, above-mentioned wrapping angle is defined as the complementary angle (angle of 90 °-above-mentioned formation) of the angle that the shaft centre line of the normal of the conical surface and oil lubricating roller bearing device forms.

According to above-mentioned mode of execution, because above-mentioned wrapping angle is set at more than or equal to 25 °, the circular cone plane of trajectory orbital that makes the outer ring on the outflow direction of oil gradually the degree of expansion become big, so, can strengthen in the running of bearing means the speed of oil when this circular cone plane of trajectory orbital moves that arrives the circular cone plane of trajectory orbital of outer ring because of centrifugal force.Therefore, oil is more effectively flowed out, thereby can increase the degree that the moment of oil lubrication-type rolling bearing device itself reduces.

In more detail, according to above-mentioned mode of execution, because above-mentioned wrapping angle is set at more than or equal to 25 °, so, compare with the common bearing that wrapping angle is set at about 20 °, can improve the discharge ability that flows to the oil of outer ring side because of centrifugal force, thereby the moment that is caused by the stirring resistance can be reduced more than or equal to 20%.

In addition, in the oil lubrication-type rolling bearing of a mode of execution, above-mentioned oil flows into the inhibition parts and comprises the above-mentioned inner ring of oily inflow side and the parts of the sealing of the open part ground between the above-mentioned outer ring, and above-mentioned oil flows out and promotes structure to be included in the parts of oily outflow side along the outflow direction extension of oil.

In addition, in this manual, short of explanation especially, the outflow side of oil just is defined as that (at rolling element is under the situation of tapered roller with respect to the center by rolling element, be on the tapered roller central shaft and large end face and the middle point of small end face) and the plane vertical with the central shaft of outer ring, be the downstream side of oil flow.In addition, the inflow side of oil being defined as, is the upstream side of oil flow with respect to above-mentioned plane.

According to above-mentioned mode of execution, above-mentioned oil flows into and suppresses parts owing to comprise the parts that extend in the mode of the above-mentioned opening that seals oily inflow side, thereby the oil that can suppress reliably except the required oil of bottom line is immersed in oil lubrication-type rolling bearing device inside from above-mentioned opening.In addition, promote mechanism to be included in the parts that extend along the outflow direction of oil oily outflow side, thereby can promote structure that the mobile of oil carried out rectification, thereby oil is more effectively flowed out by this oil outflow owing to above-mentioned oil flows out.

In addition, in the oil lubrication-type rolling bearing of a mode of execution, the end face of the big footpath of above-mentioned tapered roller side and be arranged at above-mentioned inner ring circular cone plane of trajectory orbital big footpath side and with the end face of the contacted lip part of end face of the big footpath of above-mentioned tapered roller side at least one side, cover by ganoine thin film.

According to above-mentioned mode of execution, because the end face of the big footpath of above-mentioned tapered roller side, with at least one side in the end face of above-mentioned lip part, cover by ganoine thin film, thereby can reduce the end face of the big footpath of above-mentioned tapered roller side and the friction of above-mentioned lip part end face, thereby further reduce moment, simultaneously, even the oil of supplying with is in minimum state, also can prevent sintering reliably as the end face (these contacting parts) of the end face of the big footpath of the above-mentioned tapered roller side of above-mentioned contact segment and above-mentioned lip part.

Above-mentioned rolling element is a ball,

Above-mentioned oil flows out and promotes that structure comprises: the section of the oily outflow side in the inner peripheral surface of above-mentioned outer ring is the part of expanded configuration gradually.

According to above-mentioned mode of execution, can strengthen in oil lubrication-type rolling bearing device running the oil that arrives the outer ring inner face because of the centrifugal force speed when the inner peripheral surface of above-mentioned outer ring moves.Therefore, oil is more effectively flowed out, thereby can increase the degree that the moment of oil lubrication-type rolling bearing device itself reduces.

In addition, in the oil lubrication-type rolling bearing of a mode of execution, at least one side in the plane of trajectory orbital of above-mentioned inner ring and outer ring and the above-mentioned ball is covered by ganoine thin film.

According to above-mentioned mode of execution, can reduce the plane of trajectory orbital of above-mentioned inner ring and outer ring and the frictional force of above-mentioned ball.In addition, even the oil of supplying with is in minimum state, also can prevent the sintering of above-mentioned ball and above-mentioned two plane of trajectory orbital (these contacting part) reliably.

According to the present invention, flow into the inhibition parts by oil, can suppress to be immersed in the oil mass of bearing means inside.Therefore, oil can exceedingly not be immersed in the inside of oil lubrication-type rolling bearing device, can reduce the stirring resistance of oil, thereby, can reduce the moment of oil lubrication-type rolling bearing device itself.Thereby, can reduce the fuel consume of automobile with oil lubrication-type rolling bearing device of the present invention etc.

Description of drawings

Fig. 1 is the axial sectional drawing of tapered roller bearing device of the 1st mode of execution of oil lubrication-type rolling bearing device of the present invention.

Fig. 2 is the axial sectional drawing of tapered roller bearing device of the 2nd mode of execution of oil lubrication-type rolling bearing device of the present invention.

Fig. 3 is the axial sectional drawing of tapered roller bearing device of the 3rd mode of execution of oil lubrication-type rolling bearing device of the present invention.

Fig. 4 is the axial sectional drawing of tapered roller bearing device of the 4th mode of execution of oil lubrication-type rolling bearing device of the present invention.

Fig. 5 is the figure that is illustrated in employed three tapered roller bearing devices in the test of action effect of tapered roller bearing device of above-mentioned the 1st mode of execution of investigation.

Fig. 6 is the figure that is illustrated in employed three tapered roller bearing devices in the test of action effect of tapered roller bearing device of above-mentioned the 3rd mode of execution of investigation.

Fig. 7 is the chart of the moment test result of expression three tapered roller bearing devices shown in Figure 5.

Fig. 8 is the chart of the moment test result of expression three tapered roller bearing devices shown in Figure 6.

Fig. 9 is the figure of the existing oil lubrication-type rolling bearing of expression.

Figure 10 is the axial sectional drawing of tapered roller bearing device of the 5th mode of execution of oil lubrication-type rolling bearing device of the present invention.

Figure 11 is the figure of the structure of expression differential mechanism.

Figure 12 is the figure of the tapered roller bearing device that uses when being illustrated in the reduction effect of flow of the reduction effect of investigation moment and oil.

Figure 13 is the figure of the relation of the moment of four tapered roller bearing devices of expression and tapered roller bearing and rotational speed.

Figure 14 is the figure of the relation of the flow of oil of four tapered roller bearing devices of expression and tapered roller bearing and rotating speed.

Figure 15 is the axial sectional drawing of ball bearing unit of the 7th mode of execution of oil lubrication-type rolling bearing device of the present invention.

Figure 16 is that expression is set at 50 when spending with gear oil, the figure of the rotational speed in the ball bearing unit of above-mentioned the 7th mode of execution and the existing ball bearing unit and the relation of friction torque.

Figure 17 is the figure that is illustrated in employed testing machine in the test of action effect of investigation tapered roller bearing device.

Symbol description

1,101,120,151 inner rings; 2,102,121,152 outer rings; The big end of 2a outer ring; 3,103,123 tapered rollers; 4 annuluses; 5,104,157 retainers; 6 shields; 7 shields; 8 housings; 9,10 protuberances; The part of the path side of the tapered roller in 107 retainers; The part of the big footpath side of the tapered roller in 108 retainers; The end face of the lip part of the big footpath side of 109 inner rings; The end face of the big footpath side of 110 tapered rollers; 115 circular cone plane of trajectory orbital; The opening of 116 oily inflow sides; 122,155 shields; 153 balls; The part of the more close oily outflow side of ratio ball in 158 retainers; 159 conical surfaces; θ is a wrapping angle.

Embodiment

Below, preferred forms of the present invention is described.

(the 1st mode of execution)

Fig. 1 is the axial sectional drawing of the tapered roller bearing device as oil lubrication-type rolling bearing device of the 1st mode of execution of the present invention.

This tapered roller bearing device for example is used to support the pinion shaft of the such pinion shaft support device of differential gear mechanism, the variable speed drives Biodge device of automobile.

This tapered roller bearing device is made of following part: inner ring 1; Outer ring 2; Be configured in tapered roller 3 in the annulus 4 between inner ring 1 and the outer ring 2 every predetermined interval on the direction around; The retainer 5 that keeps tapered roller 3; And the shield 6 that flows into an example that suppresses parts as oil.

Above-mentioned inner ring 1 is the rotation circle with circular cone plane of trajectory orbital, and outer ring 2 is the retainer rings with circular cone plane of trajectory orbital.Above-mentioned inner ring 1 has in the end of the path side of its circular cone plane of trajectory orbital and the contacted lip part 1a of the path end face of tapered roller 3, and, have the contacted lip part of bigger diameter end face with tapered roller 3 in the end of the big footpath of its circular cone plane of trajectory orbital side.This tapered roller bearing device flows at the opening portion from the lip part 1a side of inner ring 1 under the condition of oil and uses.

Above-mentioned shield 6 is to be purpose configuration with the inflow that limits oil.Above-mentioned shield 6 with the contacted mode of end face of the lip part 1a of the path side of the circular cone plane of trajectory orbital of inner ring 1, directly (perhaps by parts indirectly) is fixed on the running shaft.Above-mentioned shield 6 can rotate with above-mentioned running shaft.Above-mentioned shield 6 have than the lip part 1a of inner ring 1 more radius vector to the outstanding protuberance 9 of foreign side.Above-mentioned protuberance 9 is smaller or equal to the internal diameter of the end of the circular cone plane of trajectory orbital path side of outer ring 2.In addition, in the tapered roller bearing device of the 1st mode of execution, above-mentioned shield 6 is configured to the end face butt with the lip part 1a of the circular cone plane of trajectory orbital path side of inner ring 1.Yet, in the present invention, between the end face of the lip part 1a of the path side of the circular cone plane of trajectory orbital of shield 6 and inner ring 1, inner ring 1 axially on also can have the space, shield 6 can be not and the end face butt of the lip part 1a of the circular cone plane of trajectory orbital path side of inner ring 1 yet.In addition, can also arrangement components between the end face of the lip part 1a of the circular cone plane of trajectory orbital path side of shield 6 and inner ring 1.

In other words, the size of the outer diameter D of above-mentioned protuberance 9 is more than or equal to the outer diameter A of the little distolateral lip part 1a of inner ring 1.In addition, above-mentioned protuberance 9 is configured in respect to retainer 5 on the position of the axial outside of inner ring 1 devices spaced apart (gap) d.

In addition, to be dimensioned under the situation different with above-mentioned the 1st mode of execution, that is to say, the outer diameter D with shield 6 be designed to outer diameter A than the little distolateral lip part 1a of inner ring 1 little, under the situation of " D＜A ", just can't suppress the inflow of lubricant oil, thereby the effect that running torque reduces diminishes.

In addition, no matter the outside dimension of shield 6 how, when gap d was " d＞3mm ", the inhibition effect that lubricant oil is flowed into will diminish, thereby the effect that running torque reduces diminishes.

Tapered roller bearing device according to the 1st mode of execution, because the outer diameter D of the protuberance 9 of shield 6 is formed outer diameter A more than or equal to the little distolateral lip part 1a of inner ring 1, simultaneously, smaller or equal to the internal diameter C of interior all ends of the big end 2a of outer ring 2 (smaller or equal to the internal diameter C of the end of the circular cone plane of trajectory orbital path side of outer ring 2), and, protuberance 9 is separated predetermined interval d from the end of retainer 5 to the axial outside of inner ring 1 to be configured, thereby, the immersion of lubricant oil can be limited, thereby the stirring resistance can be especially reduced.More lean under the situation in the axial outside in the end that protuberance is configured in than retainer, effect is particularly remarkable.

To be dimensioned under the situation different with above-mentioned the 1st mode of execution, that is to say, when the outer diameter D of shield 6 less than the outer diameter A of the little distolateral lip part 1a of inner ring 1, when being " D＜A ", the inhibition effect that lubricant oil is flowed into will diminish, the effect that running torque reduces also diminishes.In addition, when outer diameter D greater than the internal diameter C of interior all ends of the big end 2a of outer ring 2, when being " D＞C ", because lubricant oil flows into tapered roller bearing device inside hardly, therefore, track circle (inner ring 1 and outer ring 2) will be not enough with the lubricating of surface of contact of tapered roller 3, and surface of contact just can damage or sintering.

In addition, no matter the size of the outer diameter D of shield 6 how, when gap d was " d＞3mm ", the inhibitory action that lubricant oil is flowed into just diminished, thereby the effect that running torque reduces also diminishes.

In addition, in the tapered roller bearing device of above-mentioned the 1st mode of execution, protuberance 9 is formed on the axial foreign side of shield 6, but in the present invention, also protuberance can be formed on the position except the axial foreign side of shield.In addition, in the tapered roller bearing of above-mentioned the 1st mode of execution, protuberance is in the roughly inwardly square extension as the crow flies in footpath, but in the present invention, protuberance also can be in roughly inwardly side's extension sideling of footpath.

(the 2nd mode of execution)

In the tapered roller bearing device of above-mentioned the 1st mode of execution, disposed shield 6 with inner ring 1 split in little distolateral (the lip part 1a side) of inner ring 1, and the tapered roller bearing device of the 2nd mode of execution as shown in Figure 2, the lip part 1a and the shield 6 of the circular cone plane of trajectory orbital path side of inner ring 1 are formed as one, and only this tapered roller bearing device with the 1st mode of execution is different.To the common variation of tapered roller bearing device of the tapered roller bearing device and the 1st mode of execution of the 2nd mode of execution, omit explanation.

The tapered roller bearing device of the 2nd mode of execution and the 1st mode of execution are same, and more radius vector is outstanding to foreign side than the lip part 1a of inner ring 1 for protuberance 9.In addition, protuberance 9 is configured in end from retainer 5 on the position of the axial outside devices spaced apart d of inner ring 1.

As the tapered roller bearing device of the 2nd mode of execution, inner ring 1 and shield 6 are formed as one, can reduce the running torque that causes by the stirring resistance, and, also can reduce machining period and assemble man-hour.

(the 3rd mode of execution)

The basic structure of the tapered roller bearing device of the 3rd mode of execution is identical with the basic structure of the tapered roller bearing device of the 1st mode of execution.In the tapered roller bearing device of the 3rd mode of execution, be the fixing shield 7 that flows into an example that suppresses parts as oil on the housing 8 of fixing outer ring 2.

In more detail, above-mentioned shield 7 is fixed on the housing 8 in the mode with the end face butt of the end of the circular cone plane of trajectory orbital path side of outer ring 2.Above-mentioned shield 7 has than the end of the path side of the circular cone plane of trajectory orbital of outer ring 2 more to radially the outstanding protuberance 10 of interior side.In other words, the internal diameter F of above-mentioned protuberance 10 sets the internal diameter C smaller or equal to all ends in the big end 2a of outer ring 2 for.In addition, above-mentioned protuberance 10 be configured in respect to retainer 5 outer ring 1 axially on the position of devices spaced apart.Above-mentioned protuberance 10 and retainer 5 are set at smaller or equal to 3mm in above-mentioned gap d on axially.In addition, in the tapered roller bearing device of the 3rd mode of execution, above-mentioned shield 7 is fixed on the housing 8 in the mode with the end face butt of the end of the circular cone plane of trajectory orbital path side of outer ring 2.Yet, in the present invention, between the end face of the end of the circular cone plane of trajectory orbital path side of shield 7 and outer ring 2, outer ring 2 axially on also can have the space, shield 7 can be not and the end face butt of the end of the circular cone plane of trajectory orbital path side of outer ring 2 yet.In addition, also can arrangement components between the end face of the end of the circular cone plane of trajectory orbital path side of shield 7 and outer ring 2.

In addition, to be dimensioned under the situation different with the 3rd mode of execution, that is to say, bigger at the internal diameter F that will be dimensioned to shield 7 than the internal diameter C of the inner diameter end of the big end 2a of outer ring 2, under the situation of " F＞C ", the effect that suppresses the lubricant oil inflow just diminishes, and the effect that running torque reduces also diminishes.In addition, no matter the internal diameter size of shield 7 how, when gap d is " d＞3mm ", suppress effect that lubricant oil flows into just not clearly, thereby the effect that running torque reduces diminishes.In order when reducing running torque, to guarantee lubricity, preferred A≤F≤B.

(the 4th mode of execution)

In the tapered roller bearing device of above-mentioned the 3rd mode of execution, on the housing 8 of fixing outer ring 2, fixed shield 7 with outer ring 2 splits.Yet, also can be as shown in Figure 4, the big end 2a and the shield 7 of outer ring 2 formed as one, and, protuberance 10 is configured in respect to retainer 5, outer ring 1 axially on separate on the position smaller or equal to the interval d of 3mm.

According to the tapered roller bearing device of the 4th mode of execution, same with the tapered roller bearing device of the 2nd mode of execution, can reduce the running torque that causes by the stirring resistance, and, can also reduce machining period and assemble man-hour.

These are when the pinion shaft of the such pinion shaft support device of the differential gear mechanism that is used to support automobile, variable speed drives Biodge device, flow in the bearing in a large number, stir under the big situation of resistance change at the higher oil of ratio of viscosities, just bring into play the effect that significant more moment reduces.

In more detail, the tapered roller bearing device shown in Fig. 5 (A) is existing tapered roller bearing.In addition, the tapered roller bearing shown in Fig. 5 (B) is the tapered roller bearing device of development A, and the tapered roller bearing shown in Fig. 5 (C) is the tapered roller bearing device of development B.

The dimensional ratios of subjects is set as follows.

That is to say, shown in Fig. 5 (A), with the lubricant oil of existing tapered roller bearing flow into the inner ring 11 of side lip part 11a, be that the external diameter of lip part 11a of the circular cone plane of trajectory orbital path side of inner ring 11 is set at φ A, the internal diameter of retainer 15 is set at φ B, the internal diameter of the inner peripheral surface end of the big end 12a of outer ring 12 is set at φ C.

In addition, in the tapered roller bearing device of development A, set the outside dimension φ D of the protuberance 9 of shield 6 for φ D=φ B, simultaneously, with protuberance 6 and retainer 5, inner ring 1 axial interval d sets d=0.1mm for.

In addition, in the tapered roller bearing device of development B, set the outside dimension φ E of the protuberance 9 of shield 6 for φ E=φ C, simultaneously, with protuberance 6 and retainer 5, inner ring 1 axial interval d sets d=0.1mm for.

In addition, Figure 17 is the figure of expression testing machine.This testing machine is vertical moment testing apparatus.As shown in figure 17, this vertical moment testing apparatus makes the inner ring rotation of test tapered roller bearing device (being recited as test bearing among Figure 17).In addition, this vertical moment testing apparatus is fixing up with the large end face of outer ring.In addition, as test conditions, adopted following condition.

Thrust load ... 4kN (thousand newton)

Oiling agent ... gear oil 85W-90

Rotating speed ... 2000r/min

The lubricant oil supplying temperature ... 50 ℃

Oil supply amount ... with the upper surface of fuel head distance between bearing is that the mode of 40mm is supplied with

Like this, make three tapered roller bearing devices that show in detail said structure movable under these conditions respectively, respectively above-mentioned three tapered roller bearing devices have been measured moment.

Fig. 7 is the chart of this test result of expression.

As shown in Figure 7, when the outer diameter A of the outer diameter D of the protuberance 9 of shield 6 being set for more than or equal to the lip part 1a of the circular cone plane of trajectory orbital path side of inner ring 1, simultaneously, set internal diameter C for smaller or equal to interior all ends of the big end 2a of the circular cone plane of trajectory orbital path side of outer ring 2, and, when being set at smaller or equal to 3mm in above-mentioned gap on axially protuberance 9 and retainer 5, just running torque can be reduced to 60%～64% of existing tapered roller bearing running torque significantly.In other words, running torque can be reduced by 36%～40%.

In more detail, the tapered roller bearing device shown in Fig. 6 (A) is existing tapered roller bearing.In addition, the tapered roller bearing device shown in Fig. 6 (B) is the tapered roller bearing device of development C, and the tapered roller bearing device shown in Fig. 6 (C) is the tapered roller bearing device of development D.

The dimensional ratios of subjects is set as follows.

That is to say, shown in Fig. 6 (A), with existing tapered roller bearing lubricant oil flow into the inner ring 11 of side lip part 11a, be that the external diameter that the flange of the circular cone plane of trajectory orbital path side of inner ring 11 cuts open 11a is set at φ A, the internal diameter of retainer 15 is set at φ B, the internal diameter of the inner peripheral surface end of the big end 12a of outer ring 12 is set at φ C.

In addition, in the tapered roller bearing device of development C, set the internal diameter size φ F of the protuberance 10 of shield 7 for φ F=(φ B+ φ C)/2, simultaneously, with protuberance 10 and

retainer

5,2 axial interval d set d=0.1mm in the outer ring.

In addition, in the tapered roller bearing device of development D, set the internal diameter size φ G of the protuberance 10 of shield 7 for φ G=φ A, simultaneously, with protuberance 10 and

retainer

5,2 axial interval d set d=0.1mm in the outer ring.

In addition, as testing a machine, adopted vertical moment testing apparatus shown in Figure 17.Like this, when making the inner ring rotation, under the condition that the outer ring large end face is fixing up, test.In addition, test has adopted following condition as test conditions.

Thrust load ... 4kN (thousand newton)

Oiling agent ... gear oil 85W-90

Rotating speed ... 2000r/min

The lubricant oil supplying temperature ... 50 ℃

Oil supply amount ... with the upper surface of fuel head distance between bearing is that the mode of 40mm is supplied with.

Like this, make three tapered roller bearing devices that show in detail said structure movable under these conditions respectively, in above-mentioned three tapered roller bearing devices, measured moment respectively.

Fig. 8 is the chart of this test result of expression.

As shown in Figure 8, when the internal diameter F with the protuberance 10 of shield 7 sets internal diameter C smaller or equal to the inner peripheral surface end of the big end 2a of outer ring 2 for, simultaneously, outer diameter A more than or equal to the lip part 1a of the circular cone plane of trajectory orbital path side of inner ring 1, and, when being set at protuberance 10 and retainer 5 gap in the axial direction smaller or equal to 3mm, just running torque can be reduced to significantly existing tapered roller bearing running torque 79%～82%.In other words, running torque can be reduced by 18%～21%.

(the 5th mode of execution)

This tapered roller bearing device has inner ring 101, outer ring 102 and tapered roller 103.

Between the circular cone plane of trajectory orbital 115 of above-mentioned tapered roller 103 all sides in the circular cone plane of trajectory orbital of inner ring 101 outer circumferential sides and outer ring 102, under the state that is kept by retainer 104, it is a plurality of roughly to separate predetermined arranged spaced around on the direction.The big footpath side of above-mentioned tapered roller 103 is towards the outflow side of oil.

In more detail, the number of above-mentioned tapered roller 103 is set for: its number is being made as z, the average diameter (the big footpath side of tapered roller and the mid diameter of path side) of tapered roller 103 is made as DW, when the pitch diameter of tapered roller is made as dm, satisfy the number of z≤0.85/ (DW/ (π dm)).

According to experiment, if the number of tapered roller is formed the big number than 0.85/ (DW/ (π dm)), moment will sharply increase, on the other hand, as the 5th mode of execution, if the number of tapered roller 103 is controlled at smaller or equal to 0.85/ (DW/ (π dm)), just can confirm that moment diminishes.

To be configured between inner ring 101 and the outer ring 102 by z the tapered roller 103 that the number that satisfies z≤0.85/ (DW/ (π dm)) limits, make the outflow side of the big footpath side of this tapered roller 103 towards oil, thereby the tapered roller 103 shared spaces between inner ring 101 and the outer ring 102 are diminished, and the runner of oil is broadened, this configuration structure becomes oil and flows out a part that promotes structure.

In addition, the complementary angle circular cone plane of trajectory orbital 115 that define, outer ring 102 of the angle that constitutes with the normal and the shaft centre line 111 of the circular cone plane of trajectory orbital 115 of above-mentioned outer ring 102 is set at 25 ° with the wrapping angle θ of tapered roller 103.

The circular cone plane of trajectory orbital 115 of outer ring 102, with the wrapping angle of tapered roller 103 be 25 °, the degree of expansion becomes big gradually on the outflow direction of oil, it is strong that oil is discharged to outside pumping function, becomes oil and flow out a part that promotes structure.

In addition, the part 107 of the tapered roller 103 path sides in the above-mentioned retainer 104, in the direction of the opening 116 of the oily inflow side of sealing, promptly the footpath makes progress, near the outer circumferential face of the end that extends to inner ring 101 from the very near place of the circular cone plane of trajectory orbital 115 of outer ring 102.In addition, the parts 108 of tapered roller in the above-mentioned retainer 104 103 big footpath sides, from from the very near places of end face 110 of tapered roller 103 big footpath sides, along the direction of roughly oil flow direction, be tapered roller 103 axially on extend.

Not expression among the figure, but the axial end face 119 of the part 107 of above-mentioned path side, form circular plate shape with the roughly the same hollow of above-mentioned opening 116 shapes, flow into the most oil of bearing, only the small gap between the circular cone plane of trajectory orbital 115 of part 107 by above-mentioned path side and outer ring 102 is immersed in bearing inside.

The part 107 of path side becomes oil and flows into the inhibition parts, and this part 107 is the parts that extend in the mode of sealing above-mentioned opening 116.

In addition, the part 108 of the big footpath side of the tapered roller 103 in the above-mentioned retainer 104 forms the shape of mobile almost parallel with oil, can carry out rectification to oil mobile.The part 108 of above-mentioned big footpath side becomes oil and flows out a part that promotes structure.

In addition, the end face 109 of tapered roller 103 sides in the lip part of the big footpath of the circular cone plane of trajectory orbital side of inner ring 101 carries out coating by the diamond-like carbon film (DLC) as an example of ganoine thin film.Therefore, even the oil between the slip surface separately of above-mentioned end face 109 and tapered roller 103 tails off, also can prevent sintering reliably.

In Figure 10, arrow A, B, C, D and E represent the flow direction of oil.When oil is immersed in bearing when inner from the direction of arrow A in the running up of bearing, this oil will be splashed near the circular cone plane of trajectory orbital 115 because of centrifugal force, roughly moves to the arrow C direction along this circular cone plane of trajectory orbital 115, flows out from the opening of the oily outflow side of bearing.In addition, when being immersed in bearing when inner from the direction of arrow A in the low-speed running of oil at bearing, except moving and flow out to the outside path in the arrow C direction as mentioned above, also move along the arrow B direction in inside radially, afterwards, flow out to the outside by following path: flow out to outside path via arrow D direction with the axial almost parallel of tapered roller 3, perhaps to a certain extent after circular cone plane of trajectory orbital 115 moves, move along the arrow E direction in inside radially, flow out to outside path etc. then.

Tapered roller bearing device according to above-mentioned the 5th mode of execution, because the number z of tapered roller 103 is controlled to be smaller or equal to 0.85/ (DW/ (π dm)), space between the tapered roller 103 of feasible direction adjacency around increases, thereby increased oily runner, thereby can promote the outflow of oil.Therefore, can reduce the oil mass of bearing inside, thereby can reduce to rely on oil mass and the stirring resistance that produces.

In addition, tapered roller bearing device according to above-mentioned the 5th mode of execution, because the circular cone plane of trajectory orbital 115 of outer ring 102 and the wrapping angle of tapered roller 103 are set at 25 °, make that the change of the degree of expansion is big gradually on the outflow direction of oil in outer ring 102, therefore, can strengthen in bearing operation be splashed to outer ring 102 because of centrifugal force the oil of circular cone plane of trajectory orbital 115 along the speed of circular cone plane of trajectory orbital 115 when the arrow C direction moves, thereby oil is more effectively flowed out.Therefore, the stirring resistance of oil can further reduce, thereby can further increase the degree that the moment of bearing itself reduces.

In addition, tapered roller bearing device according to above-mentioned the 5th mode of execution, because the part 108 of the tapered roller 103 big footpath sides in the above-mentioned retainer 104, form the shape of mobile such and mobile almost parallel oil do not hinder oil, thereby can utilize 108 pairs of oil of part mobile of this big footpath side to carry out rectification.Therefore, oil is more effectively flowed out.

In addition, tapered roller bearing device according to above-mentioned the 5th mode of execution, owing to can suppress to be immersed in the oil mass of bearing inside by the part 107 that flows into the path side of the retainer 104 that suppresses parts as oil, thereby can further reduce the stirring resistance of oil.

Like this, tapered roller bearing device according to above-mentioned the 5th mode of execution, can suppress to be immersed in the oil mass of bearing inside by the part 107 that flows into the path side of the retainer 104 that suppresses parts as oil, simultaneously, flowing out the promotion structure by the oil that is made of above-mentioned three parts can make the oil that is immersed in bearing inside promptly flow out to the outside of bearing.Therefore, oil can not be detained in bearing inside, thereby can reduce the stirring resistance of oil.Therefore, can reduce the moment of bearing itself, reduce the operating cost of machinery with this tapered roller bearing device.

In addition, tapered roller bearing device according to above-mentioned the 5th mode of execution, because the end face 109 of the lip part of the big footpath side of inner ring 101 is covered by the diamond-like carbon film that can suppress to rub, wear and tear, thereby can reduce tapered roller 103 end face 110 and the inner ring 101 big directly frictions of the end face 109 of the lip part of sides of footpath sides greatly, thereby can further reduce moment.In addition, flow into the inhibition parts, can prevent end face 109 and the tapered roller 103 big directly sintering of the end face 110 of sides that possibility uprises, the inner ring 101 big directly lip parts of sides reliably by oil is set.

In addition, in the tapered roller bearing device of above-mentioned the 5th mode of execution, the part 107 of above-mentioned path side is flowed into the inhibition parts as oil, utilize the part 107 of this path side to suppress flowing of oil, the part 107 of this path side is in the direction of the opening 116 of the oily inflow side of sealing, promptly the footpath makes progress, from 102 the very near place of circular cone plane of trajectory orbital 115 extends to the outer circumferential face of the end of inner ring 102 from the outer ring.

Yet, in oil lubrication-type rolling bearing device of the present invention, for example, the end of the internal side diameter of the steel shield of circular plate shape that also can be by hollow is set on the end face of the path side end of the circular cone plane of trajectory orbital of inner ring etc., the inner ring of the oily inflow side of bearing and the opening between the outer ring are all covered past except small gap, suppress the inflow of oil.

Perhaps, the shield of steel can be installed on the outer circumferential face of the end of the circular cone plane of trajectory orbital path side of inner ring also, suppress the inflow of oil, the shield of this steel has the main body portion of the circular plate shape of hollow etc. and from this main body portion bending assembly department of 90 ° roughly.In more detail, also can be by on the outer circumferential face of the end of the circular cone plane of trajectory orbital path side of inner ring, fixing the assembly department of above-mentioned shield, the inner ring of the oily inflow side of bearing and the opening between the outer ring are all covered past except only small gap, suppress the inflow of oil.

In addition, if shield is the parts that the opening of the inflow side of oil all can be covered except that micro-gap, be installed in passablely so everywhere, the shape of shield also is not limited to the circular plate shape of hollow, and what kind of shape can.In addition, both can utilize the parts that are contained in the rolling bearing (promptly, inner ring, outer ring, rolling element, retainer) a part constitute oil and flow into and suppress parts and oil flows out at least one side who promotes structure, also can utilize parts outside the rolling bearing (for example, shield etc.) to constitute oil flows into and suppresses parts and oil flows out at least one side who promotes structure.

In addition, in the tapered roller bearing device of above-mentioned the 5th mode of execution, the wrapping angle that the circular cone plane of trajectory orbital 115 of outer ring 102 is formed with 25 ° contacts with tapered roller 103, can confirm according to experiment, the circular cone plane of trajectory orbital of outer ring is set for more than or equal to 25 ° wrapping angle and contacted words of tapered roller, can be reduced moment sharp.Therefore, also the circular cone plane of trajectory orbital of outer ring can be formed with the wrapping angle greater than 25 ° of angles and contact with tapered roller.

In addition, in the tapered roller bearing device of above-mentioned the 5th mode of execution, utilize diamond-like carbon film (DLC), the end face 109 of tapered roller 103 sides in the lip part of the big footpath of the circular cone plane of trajectory orbital side of inner ring 101 is carried out coating as an example of ganoine thin film.

Yet, also can utilize the end face of the diamond-like carbon film pair big footpath of the tapered roller side that contacts with the end face of this tapered roller side to carry out coating, replace utilizing diamond-like carbon film that the end face of the tapered roller side in the lip part of the big footpath of the circular cone plane of trajectory orbital side of inner ring is carried out coating.

In addition, also can utilize the end face both of the big footpath of the tapered roller side that diamond-like carbon film contacts with end face with this tapered roller side the end face of the tapered roller side in the lip part of the big footpath of the circular cone plane of trajectory orbital side of inner ring to carry out coating.

In addition, also the end face of the tapered roller side in the lip part of the big footpath of the circular cone plane of trajectory orbital side of inner ring and at least one side of the end face of the big footpath of the tapered roller side that contacts with this tapered roller side end face can be utilized carboritride ganoine thin film, Al such as nitride hard film, TiCN such as carbide hard film, CrN, TiN and TiAlN such as TiC as other example of ganoine thin film ₂O ₃Carry out coating Deng oxide hard film or WC/C ganoine thin films such as (Tungsten carbite/carbon), suppress the end face of lip part of the big footpath of inner ring side and the end face sintering of the big footpath of tapered roller side.In addition, as long as above-mentioned ganoine thin film covers at least one side in the sliding parts of end face of the sliding parts of end face of the tapered roller side in the lip part of the big footpath of circular cone plane of trajectory orbital side of inner ring and the big footpath of tapered roller side.

The present inventor investigates the reduction effect of the moment in the tapered roller bearing device of using at the pinion shaft that supports differential mechanism, when the inlet of oil and outlet are sealed and the reduction effect of oily flow.

Figure 11 is the figure of the structure of the differential mechanism that uses in the above-mentioned investigation of expression.

In addition, in Figure 11,182 expression live axles, the tapered roller bearing device of 183 expression rear side (below, be called rear side), the tapered roller bearing device of 184 expression head side (below, be called head side), 185 expression differential gears.

Figure 12 is the figure of the tapered roller bearing device that uses in the above-mentioned investigation of expression.

In more detail, the figure of the tapered roller bearing device (tapered roller bearing device that is equivalent to the present invention's the 1st mode of execution) of Figure 12 (a) embodiment of the invention 1 that to be expression partly close the oil-in of inner ring and retainer with the shield of steel.

In addition, Figure 12 (b) is the figure of the tapered roller bearing device (below, be called embodiment 2) of expression the 6th mode of execution of the present invention.In more detail, be that the end face that is illustrated in the oily inflow side of retainer is provided with the steel shield that extends in foreign side radially, in the inflow side of oil, with the figure of the tapered roller bearing device of complete closed roughly between the end of retainer and the outer ring.

In addition, Figure 12 (c) is the outflow side that is illustrated in oil, with the shield figure of the tapered roller bearing device of the comparative example 1 of complete closed roughly of usefulness steel between the end of outer ring and retainer.

In addition, Figure 12 (d) is the outflow side that is illustrated in oil, with the figure of the tapered roller bearing device of the comparative example 2 that seals with the shield of steel between the end of inner ring and retainer.

In addition, in Figure 12 (a), the 120th, inner ring, the 121st, the outer ring, the 122nd, shield, the 123rd, tapered roller, G, H, I and J are represented the flow direction of oil respectively.

In addition, Figure 13 (a) is above-mentioned four tapered roller bearing devices of expression and the figure of the relation of the moment of head side separately (head side bearing) of the tapered roller bearing of the existing product that shield is not set and rotating speed, and Figure 13 (b) is above-mentioned four tapered roller bearing devices of expression and the figure of the relation of the moment of the rear side separately (rear side bearing) of the tapered roller bearing of the existing product that shield is not set and rotating speed.

In addition, Figure 14 (a) is above-mentioned four tapered roller bearing devices of expression and the oily flow of the head side separately of the tapered roller bearing of the existing product that shield is not set and the figure of rotation speed relation, and Figure 14 (b) is above-mentioned four tapered roller bearing devices of expression and the oily flow of the rear side separately of the tapered roller bearing of the existing product that shield is not set and the figure of rotation speed relation.

In addition, in Figure 13 and Figure 14, the point that ■ represents is the measured load of tapered roller bearing device of the embodiment of the invention 1 of Figure 12 (a), the point of ▲ expression is the measured load of tapered roller bearing device of the embodiment of the invention 2 of Figure 12 (b), the point of * expression is the measured load of tapered roller bearing device of the comparative example 1 of Figure 12 (c), * Biao Shi point is the measured load of tapered roller bearing device of the comparative example 2 of Figure 12 (d), ◆ the point of expression is the measured load of the tapered roller bearing of existing product.

Shown in Figure 13 (a) and Figure 13 (b), in the head side and rear side of bearing, the tapered roller bearing device of the comparative example 1 of usefulness * expression measured load, the roughly proportional relation of its moment values and rotating speed enlarges markedly.

In addition, when rotating speed increases, tapered roller bearing device, the usefulness of the embodiment of the invention 2 with ▲ expression measured load ◆ the tapered roller bearing of the existing product of expression measured load and the tapered roller bearing device of representing the comparative example 2 of measured load with *, their moment values all increases, but compare with the tapered roller bearing device of the comparative example 1 of usefulness * expression measured load, moment values is little.In more detail, the tapered roller bearing device of the embodiment of the invention 2 of usefulness ▲ expression measured load is with usefulness ◆ the tapered roller bearing device of the existing product of expression measured load is compared, and moment values is little.In addition, use ◆ the tapered roller bearing device of the existing product of expression measured load, compare with the tapered roller bearing device of the comparative example 2 of representing measured load with *, moment values is little.Shown in Figure 13 (a) and Figure 13 (b), sealed the tapered roller bearing device of above-mentioned two comparative examples of the opening of oily outflow side, the stirring resistance of its oil is big, thus moment is big.

On the other hand, of the present inventionly represent the tapered roller bearing device of the embodiment of the invention 1 of measured load with ■, its moment values minimum, and, reducing in the high rotary speed area of moment requiring most, its moment values roughly is stabilized on the low value.

In addition, shown in Figure 14 (a) and Figure 14 (b), in the head side and rear side of bearing, with ◆ the tapered roller bearing device of the existing product of expression measured load and with ▲ represent the tapered roller bearing device of the embodiment of the invention 2 of measured load, their oily flow change demonstrates roughly the same tendency, the flow of oil is maximum, and when rotating speed increased, the flow of oil also increased.

In addition, with the tapered roller bearing device of the comparative example 1 of * expression measured load with represent the tapered roller bearing device of the comparative example 2 of measured load with *, their oily flow change demonstrates roughly the same tendency, and when rotating speed increases, the flow of oil also increases, and with usefulness ◆ the tapered roller bearing device of the tapered roller bearing of existing product of expression measured load and the embodiment of the invention 2 of usefulness ▲ expression measured load is compared, and oily flow is little.

On the other hand, represent the tapered roller bearing device of the embodiment of the invention 1 of measured load with ■, along with rotating speed from low regional change to high zone, its oily flow reduces, and at high rotary speed area, its oily stability of flow is on low value.Therefore, the tapered roller bearing device of the embodiment of the invention 1 of representing measured load with ■ can make the stirring resistance minimum of oil in the high speed rotating zone.

As mentioned above, the tapered roller bearing device of the comparative example 1 moment values maximum, usefulness * expression measured load, the operating cost height in high-revolving zone, thereby be unsuitable for running up.

In addition, the tapered roller bearing device of the embodiment of the invention 2 with ▲ expression measured load, with usefulness ◆ the tapered roller bearing of the existing product of expression measured load is compared, moment values is little, with ◆ the tapered roller bearing device of the existing product of expression measured load, compare with the tapered roller bearing device of the comparative example 2 of representing measured load with *, moment values is little.

Therefore, though tapered roller bearing device, the usefulness of the embodiment of the invention 2 ◆ though the tapered roller bearing of the existing product of expression measured load and represent that with * the tapered roller bearing device of the comparative example 2 of measured load is not best with ▲ expression measured load, but tapered roller bearing device, usefulness ◆ the tapered roller bearing of the existing product of expression measured load and the order of tapered roller bearing device of representing the comparative example 2 of measured load with * are applicable to run up according to the embodiment of the invention 2 of usefulness ▲ expression measured load.

On the other hand, the tapered roller bearing device of representing the embodiment of the invention 1 of measured load with ■, no matter how high rotating speed be in zone, because moment values can not increase, thereby can reduce the moment values of high-speed region significantly, thereby can reduce the operating cost that runs up significantly, be suitable for most running up.Therefore, can understand: it is remarkable that the moment that possesses the tapered roller bearing device (tapered roller bearing device of the 1st mode of execution) of following condition (1)～(5) reduces effect.(1) rolling element is a tapered roller.(2) inner ring is the rotation circle with circular cone plane of trajectory orbital, and the outer ring is the retainer ring with circular cone plane of trajectory orbital.(3) inner ring has the contacted lip part of path end face with tapered roller.(4) have shield, this shield have than the lip part of inner ring more radius vector to the outstanding protuberance of foreign side.(5) have the retainer that keeps tapered roller, above-mentioned protuberance be configured in respect to retainer inner ring axially on the position of devices spaced apart.

(the 7th mode of execution)

The shield 155 that this ball bearing unit has inner ring 151, outer ring 152, ball 153 and flows into the steel of an example that suppresses parts as oil.

Above-mentioned ball 153 under the state that is kept by retainer 157, separates predetermined interval around and roughly equally spaced disposes a plurality of between the plane of trajectory orbital of the plane of trajectory orbital of inner ring 151 and outer ring 152 on the direction.

In addition, the ball 153 in the ratio drawing of above-mentioned outer ring 152 also on the right side the inner face of oily outflow side be conical surface 159.This conical surface 159 is parts that oil flow out to promote structure, along with near radially foreign side and expansion gradually, thereby has promoted the oil that is immersed in bearing inside to flow out to the bearing outside.

In addition, in the drawing of above-mentioned outer ring 152 left side, be on the end of inner face of oily inflow side, be formed with annular recessed portion 154.In this recess 154, fixing an end of above-mentioned shield 155.The part except that an above-mentioned end of above-mentioned shield 155 forms the circular plate shape of general hollow, in the direction of the opening of the oily inflow side of sealing, promptly the footpath makes progress, extends near the outer circumferential face of inner ring 151.Above-mentioned shield 155 is except this shield 155 footpaths inwardly the oily runner 163 between the outer circumferential face of the end of side and inner ring 151, and the opening of the inflow side of oil is all sealed.

In addition, the ratio ball 153 of above-mentioned retainer 157 extends on the direction of roughly oil flow also near the part 158 of oily outflow side.This part 158 is being undertaken the mobile task of carrying out rectification to oil, becomes oil and flows out a part that promotes structure.

In addition, the surface of the plane of trajectory orbital of the plane of trajectory orbital of above-mentioned inner ring 151, outer ring 152 and ball 153 is covered by the DLC ganoine thin film, even the oil between the surface of the plane of trajectory orbital of the plane of trajectory orbital of inner ring 151 and outer ring 152 and ball 153 is under the considerably less state, can not cause sintering yet.

Figure 16 is that expression is set at 50 when spending with gear oil, the figure of the relation ball bearing of the ball bearing unit of the 7th mode of execution and the existing product that shield is not set in oily inflow side, rotational speed and friction torque.

In addition, in Figure 16, ■ represents the measured load of the ball bearing unit of the 7th mode of execution, ● the measured load of the ball bearing of expression existing product.

As shown in figure 16, in the ball bearing of existing product, when rotational speed was 2000r/min, friction torque was roughly 0.55Nm, and when rotational speed was 3000r/min, friction torque was roughly 0.64Nm.Like this, in the ball bearing of existing product, if rotating speed increases 1000r/min, value further increases significantly with regard to high friction torque originally, thereby is unsuitable for running up.

On the other hand, in the ball bearing unit of the 7th mode of execution, when rotational speed was 2000r/min, friction torque became the roughly low value of 0.33Nm, even rotational speed becomes the high speed of 3000r/min, friction torque also is suppressed to the roughly low value of 0.37Nm.Like this, in the ball bearing unit of the 7th mode of execution, even rotating speed increases 1000r/min, friction torque is still little, and friction torque increases fewly, thereby is suitable for running up.

According to the ball bearing unit of above-mentioned the 7th mode of execution, because above-mentioned shield 155 is the parts that extend in the mode of sealing oily inflow side opening, thereby, can suppress oil outside the required oil of bottom line is immersed in bearing from opening inside reliably.In addition, because the part 158 of the retainer 157 that extends along the outflow direction of oil in oily outflow side, be at the parts of the mobile side extension of oil roughly, thus can carry out rectification to the mobile of oil, thereby oil is flowed out efficiently.

In addition, ball bearing unit according to above-mentioned the 7th mode of execution, because the inner face of the outer ring 152 of oily outflow side forms the conical surface 159 that section is expanded gradually, thereby, speed in the time of can strengthening in ball bearing running the oil of conical surface 159 that is splashed to outer ring 152 because of centrifugal force 152 inner face moves along the outer ring, can make innage imitate ground and flow out, thereby can increase the degree of the moment reduction of ball bearing unit itself.

Therefore, compare, can reduce moment extraordinarily, thereby can cut down operating cost significantly with existing product.

In addition, ball bearing unit according to above-mentioned the 7th mode of execution, because the plane of trajectory orbital of inner ring 151 and outer ring 152 and the surface of ball 153 are covered with the DLC ganoine thin film, thereby can reduce the frictional force of ball 153 and the plane of trajectory orbital of inner ring 151 and outer ring 152, reduce moment, simultaneously, can also prevent the sintering of ball 153 and above-mentioned two plane of trajectory orbital reliably.

In addition, in the ball bearing unit of above-mentioned the 7th mode of execution, the plane of trajectory orbital of inner ring 151, outer ring 152 and the surface of ball 153 are covered with the DLC ganoine thin film, but also can use the DLC ganoine thin film to cover the plane of trajectory orbital of inner ring and outer ring by instrument, can also use the DLC ganoine thin film to cover on the surface of ball by instrument.

In addition, in the ball bearing unit of above-mentioned the 7th mode of execution,, adopted the DLC ganoine thin film as ganoine thin film, but certainly much less, also can be with carboritride ganoine thin film, Al such as nitride hard film, TiCN such as carbon compound ganoine thin film, CrN, TiN and TiAlN such as TiC ₂O ₃Deng ganoine thin films such as oxide hard film or WC/C, replace the DLC ganoine thin film.

Claims

1. oil lubrication-type rolling bearing device is characterized in that it has:

Inner ring;

The outer ring;

Be configured in a plurality of rolling elements between above-mentioned inner ring and the above-mentioned outer ring; And

Suppress the oily oil that flow between above-mentioned inner ring and the above-mentioned outer ring and flow into the inhibition parts,

Above-mentioned rolling element is a tapered roller,

And, also have the retainer that keeps above-mentioned tapered roller,

Above-mentioned protuberance be configured in respect to above-mentioned retainer above-mentioned inner ring axially on the position of devices spaced apart,

The external diameter of above-mentioned protuberance is smaller or equal to the internal diameter of the end of the circular cone plane of trajectory orbital path side of above-mentioned outer ring,

Above-mentioned protuberance and above-mentioned retainer in above-mentioned gap on axially smaller or equal to 3mm,

This oil lubrication-type rolling bearing device is provided with and promotes to flow into the oil outflow promotion structure that the oil between above-mentioned inner ring and the above-mentioned outer ring flows out,

Above-mentioned oil flows out and promotes that structure comprises following configuration structure: be made as z at the number with tapered roller, the average diameter of tapered roller is made as DW, when the pitch diameter of tapered roller is made as dm, the above-mentioned tapered roller that will satisfy the number z of z≤0.85/ (DW/ (π dm)) is configured between above-mentioned inner ring and the above-mentioned outer ring, and the big footpath side that makes this tapered roller is towards oily outflow side.

2. oil lubrication-type rolling bearing device as claimed in claim 1 is characterized in that,

Above-mentioned inner ring and above-mentioned shield form as one.

3. oil lubrication-type rolling bearing device as claimed in claim 1 is characterized in that,

The end face of the big footpath side of above-mentioned tapered roller and be arranged at above-mentioned inner ring the circular cone plane of trajectory orbital big footpath side and with the end face of the contacted lip part of end face of the big footpath side of above-mentioned tapered roller at least one side, cover by ganoine thin film.

4. oil lubrication-type rolling bearing device is characterized in that it has:

Inner ring;

The outer ring;

Above-mentioned rolling element is a tapered roller,

And, also have the retainer that keeps above-mentioned tapered roller,

Above-mentioned oil flows out and promotes that structure comprises: be configured to the circular cone plane of trajectory orbital with the above-mentioned outer ring that contacts with above-mentioned tapered roller more than or equal to 25 ° wrapping angle, described wrapping angle is defined as the complementary angle of angle of the shaft centre line formation of the normal of circular cone plane of trajectory orbital of outer ring and oil lubricating roller bearing device.

5. oil lubrication-type rolling bearing device as claimed in claim 4 is characterized in that,

Above-mentioned inner ring and above-mentioned shield form as one.

6. oil lubrication-type rolling bearing device as claimed in claim 4 is characterized in that,

7. oil lubrication-type rolling bearing device is characterized in that it has:

Inner ring;

The outer ring;

Above-mentioned rolling element is a tapered roller,

And, also have the retainer that keeps above-mentioned tapered roller,

Above-mentioned oil flows into the inhibition parts and comprises the above-mentioned inner ring of oily inflow side and the parts of the sealing of the open part ground between the above-mentioned outer ring,

Above-mentioned oil flows out and promotes structure to be included in the parts that roughly extend along the outflow direction of oil oily outflow side,

The parts of above-mentioned extension are in the part of the big footpath of tapered roller side along axially extended retainer.

8. oil lubrication-type rolling bearing device as claimed in claim 7 is characterized in that,

Above-mentioned inner ring and above-mentioned shield form as one.

9. oil lubrication-type rolling bearing device is characterized in that it has:

Inner ring;

The outer ring;

Above-mentioned rolling element is a tapered roller,

Above-mentioned oil flows into that to suppress parts are shields, and this shield has than the end of the circular cone plane of trajectory orbital path side of above-mentioned outer ring more to radially the outstanding protuberance of interior side,

And, also have the retainer that keeps above-mentioned tapered roller,

10. oil lubrication-type rolling bearing device as claimed in claim 9 is characterized in that,

Above-mentioned outer ring and above-mentioned shield form as one.

11. an oil lubrication-type rolling bearing device is characterized in that it has:

Inner ring;

The outer ring;

Above-mentioned rolling element is a tapered roller,

And, also have the retainer that keeps above-mentioned tapered roller,

12. oil lubrication-type rolling bearing device as claimed in claim 11 is characterized in that,

Above-mentioned outer ring and above-mentioned shield form as one.

13. an oil lubrication-type rolling bearing device is characterized in that it has:

Inner ring;

The outer ring;

Above-mentioned rolling element is a tapered roller,

And, also have the retainer that keeps above-mentioned tapered roller,

14. oil lubrication-type rolling bearing device as claimed in claim 13 is characterized in that,

Above-mentioned outer ring and above-mentioned shield form as one.