CN101169156A

CN101169156A - Superposed type roller bearing

Info

Publication number: CN101169156A
Application number: CNA2007101904018A
Authority: CN
Inventors: 周东海
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-11-27
Filing date: 2007-11-27
Publication date: 2008-04-30

Abstract

The invention relates to a bearing, in particular to a stacked rolling bearing. According to the technical proposal provided by the invention, the stacked rolling bearing comprises a circular outer ring, an inner ring, rolling elements and a rolling-element retainer, wherein, the internal surface of the outer ring and the external surface of the inner ring are provided with bearing rolling rails fitting with the rolling elements; the internal surface of the inner ring forms a mounting hole; in the bearing, the rolling elements are arranged in two circles or more two circles, two neighboring circles are separated by a free ferrule the internal and the external surfaces of which are both provided with bearing rolling rails; rolling elements contacting with the internal and the external surfaces of the free ferrule match with the bearing surface of the bearing rolling rails. When working, the invention adapts to high-speed rotation of a shaft and reduces the autorotation velocity of rolling elements, therefore having low wear and remarkably prolonging the service life.

Description

Superposed type roller bearing

Technical field

The present invention relates to a kind of bearing, especially a kind of superposed type roller bearing.

Background technique

Conventional rolling bearing is radially only to arrange a circle rolling element at bearing, even the multiple row rolling element also is arranged on the same diameter of same circle.Such rolling bearing, the rolling element rotation phenomenon is very serious, makes its wearing and tearing strengthen, and is not suitable for high speed operation, and working life is low.Rolling bearing is when running up, and rolling element and retainer obtain very big centrifugal force under high speed, and, cause the frequency of collision effect bigger at a high speed, impelled fatigue wear; Simultaneously, at a high speed cause lubricating grease to be not easy to maintain on raceway, even oiling agent is arranged in the position, but too fast to pass through oil return that frequency the causes lubricant oil degree that resets poor, the insufficient lubrication that seriously differs occurs.Just Xuan Zhuan high speed has increased the strength of destruction and the effect frequency of collapsing force, has reduced the ability of lubrication protection simultaneously.One of its final result is to have caused bearing wear faster to destroy at a high speed.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, reduce the rolling element speed of autorotation when the running up of a kind of suitable rotating shaft, long service life, work are provided and the design direction of the superposed type roller bearing that reduces wear.

According to technological scheme provided by the invention, described superposed type roller bearing, comprise circular outer ferrule, the internal layer lasso, rolling element and rolling element retainer, offer the bearing race that cooperates with rolling element at the internal surface of outer ferrule and the outer surface of internal layer lasso, the internal surface of internal layer lasso constitutes mounting hole, described rolling element bearing be provided with two the circle or two the circle more than, separated by free lasso between the two adjacent rings rolling element, in free lasso, outer surface is equipped with bearing race, in free lasso, the contacted rolling element of outer surface matches with the supporting plane of this bearing race.

Two-layer or two-layer above rolling element is the stratiform stack on the radial circumference direction of bearing, and separate by one or several free lassos, be in outer field rolling element be arranged on the rolling element that is in internal layer directly over be that the ditch centre of curvature normal of the inside and outside raceway of free lasso is overlapping on same circumferential surface.

The ditch centre of curvature normal of the inside and outside raceway by free lasso launches to stagger in the axial direction, make described rolling element bearing axially on be arranged at intervals with two circle or some circles, and the center of every circle rolling element increases successively, dwindles or identical to the distance of bearing axis.

Described rolling element is spherical, cylindric, round table-like, coniform or needle-like, and the rolling element on the difference circle is identical or inequality simultaneously.

Between the outer surface of the internal surface of the outer ferrule of bearing one side and internal layer lasso or between the outer surface of the internal surface of the outer ferrule of bearing dual-side and internal layer lasso, be provided with the seal ring of integral type simultaneously, perhaps between the internal surface of the outer surface of internal layer lasso and adjacent free lasso, between the outer surface of the internal surface of outer ferrule and adjacent free lasso and between each adjacent free lasso, split type seal ring is set respectively.

The present invention is fit to running up of rotating shaft when work, reduce the rolling element speed of autorotation during work, reduces heat and produces, and it is little to wear and tear, and helps lubricating, and obviously prolong working life.

Description of drawings

Fig. 1 is the sectional view of the embodiment of the invention 1.

Fig. 2 is the plan view of the embodiment of the invention 1.

Fig. 3 is the sectional view of the embodiment of the invention 2.

Embodiment

As shown in the figure: comprise circular outer ferrule 1, internal layer lasso 2, rolling element 3 and rolling element retainer, offer the bearing race 4 that cooperates with rolling element 3 at the internal surface of outer ferrule 1 and the outer surface of internal layer lasso 2, the internal surface of internal layer lasso 2 constitutes mounting hole 7, it is characterized in that: described rolling element 3 bearing be provided with two the circle or two the circle more than, separated by free lasso 5 between the two adjacent rings rolling element 3, in free lasso 5, outer surface is equipped with bearing race 51, in free lasso 5, the contacted rolling element 3 of outer surface matches with the supporting plane of this bearing race 51.

Two-layer or two-layer above rolling element 3 is the stratiform stack on the radial circumference direction of bearing, and separate by one or several free lassos 5, be in outer field rolling element 3 be arranged on the rolling element 3 that is in internal layer directly over be that the ditch centre of curvature normal of the inside and outside raceway of free lasso 5 is overlapping on same circumferential surface.

The ditch centre of curvature normal of the inside and outside raceway by free lasso 5 launches to stagger in the axial direction, make described rolling element 3 bearing axially on be arranged at intervals with two circle or some circles, and the center of every circle rolling element 3 increases successively, dwindles or identical to the distance of bearing axis.

Described rolling element 3 is spherical, cylindric, round table-like, coniform or needle-like, and the rolling element 3 on the difference circle is identical or inequality simultaneously.

Between the outer surface of the internal surface of the outer ferrule 1 of bearing one side and internal layer lasso 2 or between the outer surface of the internal surface of the outer ferrule 1 of bearing dual-side and internal layer lasso 2, be provided with the seal ring 6 of integral type simultaneously, perhaps between the internal surface of the outer surface of internal layer lasso 2 and adjacent free lasso 5, between the outer surface of the internal surface of outer ferrule 1 and adjacent free lasso 5 and between each adjacent free lasso 5, split type seal ring 6 is set respectively.

Embodiment 1

Two-layer or two-layer above rolling element 3 adds in the radial circumference direction upper strata folding of bearing, be in outer field rolling element 3 be arranged on the rolling element 3 that is in internal layer directly over, as shown in Figure 1, 2.

Embodiment 2

Two-layer or two-layer above rolling element 3 bearing axially on stepped setting, and the center of the rolling element 3 of stratiform increases successively or dwindles successively to the distance of bearing axis, be in the oblique upper that outer field rolling element 3 is arranged on the rolling element 3 that is in internal layer, as shown in Figure 3.This rolling element 3 can be for spherical, cylindric, round table-like or coniform.Between outer ferrule 1 internal surface of bearing both sides side and internal layer lasso 2 outer surfaces, can be provided with seal ring 6.

Suppose that bearing is outer ferrule 1 fixing, internal layer lasso 2 rotations, its operational situation is described below:

Internal layer lasso 2 rotates under the drive of rotating shaft, the rolling element 3 of its rotating force drive internal layer lasso 2 is done two kinds of motions and is revolved, the one, all rolling elements 3 are round the revolution of BEARING SHAFT, the 2nd, rolling element 3 is being the spinning at center with the own center of circle or the centre of sphere between corresponding bearing race 4 and the bearing race 51 or between the bearing race 51 of two-layer free lasso 5, may be the slip on raceway and the aggregate motion of rolling.

The running of rolling element 3, promote the inner ring retainer and rotatablely move around BEARING SHAFT, rolling element 3 surfaces and retainer inner faces promptly have slip on the tangent line to have collision campaign on the normal again, the running of rolling element 3, give 4 free lasso with energy transfer, drive free lasso 5 and revolve round the sun equally, same, the rotation of free lasso 5, drive outer ring rolling element 3 and do revolution and rotation, promote outer ring retainer motion again, bearing outer ferrule 1 is maintained fixed.

Except the typical calculating and design of traditional bearing, the superposed type bearing also needs to calculate and design the speed of free lasso.Can this velocity correlation reach the purpose of design of superposed type bearing to designed bearing.

The relation data of two-fold box-like some simplification is described below

Suppose

R1 is a bearing bore diameter

R5 is an inner ring rolling element radius

Q5 is an inner ring rolling element density

R5 is inner ring rolling element revolution radius

R2 is outer ring rolling element revolution radius

R4 is footpath in the revolution of free lasso

R2 is an outer ring rolling element radius

Q2 is an outer ring rolling element density

Y5 is an inner ring raceway wrapping angle component coefficient

Y2 is an outer ring raceway wrapping angle component coefficient

R6 is inner ring raceway contact area revolution radius

R7 is a revolution radius in raceway contact area in the free lasso

R8 is the outer raceway contact area revolution of a free lasso radius

R9, outer ring raceway contact area revolution radius

S1 is the inner ring rotating speed

S2 is the revolution of inner ring rolling element rotating speed, i.e. inner ring retainer rotating speed

S3 is free lasso rotating speed

S4 is the revolution of outer ring rolling element rotating speed, i.e. outer ring retainer rotating speed

S5 is the theoretical rotation rotating speed (contact area is fricton-tight etc.) of inner ring rolling element

S6 is the theoretical rotation rotating speed (contact area is fricton-tight etc.) of outer ring rolling element

Wherein, calculated relationship comprises

1, the calculating of the action stress balance of free lasso

Free lasso 5 is subjected to the equilibrium of forces of both direction and keeps its speed, on the one hand is to derive from that inner ring rolling element 3 rolls and the tractive force that brings, and the 2nd, pull power by the fixing resistance that is brought in outer ring.Further decomposition can be narrated out, power is divided three classes, frictional force PA, the fluid viscous force PB of the oiling agent between rolling element 3 even retainer and free lasso 5 raceways is called for short from spin, and the air between free lasso 5 surfaces and other relative motion surface or the fluid viscous force PC of lubricated oil gas are called for short public spin.

In the tractive force P=F in the PA+PB in+PC in

Power P is pulled in resistance outer=F outer { PA is outer+PB is outer+PC is outer }

F represents a kind of function relation

During balance:

In the P=P outside

In the F in the PA+PB in+PC in=F outer PA is outer+PB is outer+PC}

About frictional force

Frictional force derive from load pressure G1, derive from the pressure G2 of pretension and thermal expansion and derive from the pressure G3 of rotating speed centrifugal force relevant, and G3 relevant with friction factor is the quality of rotor and the function of its revolve round the sun rotating speed and radius simultaneously,

In the PA=F{G1 in+G2 in+G3 in, in the K1 }

In=the F{G1+G2 in+F{r5, Q5, R2 is in the S2}, K1 }

In=the F{G1+G2 in+F{r5, Q5, R2 is in the F{S1-S3}}, K1 }

Equally

PA is outer=and F{G1 is outer+and G2 is outer+F{r2, Q2, R2, F{S3}}, K1 is outer }

About from spin

When spin advocates to derive from relative movement between rolling element and raceway by the fluid viscous force that oiling agent brought in the middle of it, may also can derive from relative movement between rolling element and retainer when revolution and lasso by therebetween viscous forces that fluid brought such as oiling agent, and the fluid viscous force is the function of speed of related movement, fluid actual effect viscosity N, fluid volume factor V (relation of thickness and area of contact) etc.Speed of related movement be mainly reflected in the roll rate of rolling element, but roll rate is still relevant with the gap of S1 and S3, with S3 and fixedly the speed difference of outer ring is relevant.That is:

In the PB=F{S1-S3, in the N1, in the V1 },

Outside the PB=F{S3, outside the N1, V1 is outer }

About public spin

When rotating speed was very high, the friction that revolving part drives the next door air constituted stronger viscous force.Relative velocity is high more, and this power be can not ignore more.In like manner, this belongs to the fluid viscous force, free lasso and other part (such as retainer, inner and outer ring, Sealing) constitute speed difference, have viscous fluid such as air or air fuel-air mixture body again therebetween and form, and therefore is the function of this speed difference, gas actual effect viscosity, fluid volume factor V (the thick relation with the actual effect area of contact of gas) etc.

In the PC=and F{S1, S2, S3 is in the N2, in the V2 },

Outside the PC=and F{S3, S4, outside the N2, V2 is outer }

The significance of this relation analysis is, by in the P=outer this balanced type analysis of P and understanding: one, after all factors of bearing are fixing, be exactly the rotating speed of free lasso, determined the power of balance; Two, when other factors changed, for equilibrium of forces, the speed of free lasso also can change.Three, design all kinds of factors truly, so that the speed of free lasso remains in the desired value.

2, and free lasso change in rotational speed also must be brought adjacent respectively the enclose revolution of rolling element and the variation of speed of autorotation.Therefore the design of superposed type bearing except traditional design factor, more will be considered the design of the speed of free lasso, to obtain the purpose of superimposed design more.

A relation that is easy to help to understand is: and S5=S1 (R5-F{r5, Y5})/F{r5, Y5}-S3 (R5+F{r5, Y5})/F{r5, Y5}, the meaning of this formula is, the speed of free lasso can reduce the roll rate of rolling element; When the speed of free lasso approached the inner ring rotating speed, the roll rate of inner ring rolling element just trended towards zero, and the wearing and tearing that caused by motion also level off to zero.

Below narrate a kind of in the overlapping bearing advantage in the cards, i.e. high-speed applications.

And the present invention, under equal inside race rotational speed, the spin rotating speed of the rolling element 3 of bearing has only the part of equal individual pen bearing, has promptly reduced the part that free lasso 5 transfers are remedied.When the speed S3 of free lasso 5 be internal layer lasso 2 speed half, the spin rotating speed is also near being half of corresponding individual pen formula bearing, this moment, the wear factor that rotation caused of rolling element 3 of inner ring also decreased; And as the speed S3 of free lasso 5 during near the speed of inner ring, the spin rotating speed also approaches zero, also promptly sees in theory, and this moment, 3 the wearing and tearing of inner ring rolling element approached zero.Certainly, for two overlapping bearings, S3 can not approach S1, because S3 is excessive, the rotating speed of the rolling element 3 of outer ring has lost necessity of stack along with increase.S3 is handled on appropriate balance ground, when the quantity that to increase free lasso 5 gradually be the number of turns of rolling element 3, i.e. and multilayer stack, that the speed of each adjacent two lasso is trended towards is approaching, and each roll rate that encloses rolling element 3 levels off to zero, and wearing and tearing also level off to zero.Obtain more long-life bearing under the bearing of higher operating speed or the high operating speed.When the intensity of outer ferrule 1, internal layer lasso 2, rolling element 3 and retainer holds out against high speed, can ad infinitum prolong the wear-out life of bearing in theory.

Multi-turn of the present invention stack mentality of designing has increased the external diameter of bearing, and two circle or the more stacks of multi-turn might improper realization in the external diameter design, and it is splitlevel stack design that dimension the present invention increases a design content.Can not increase or not increase substantially under the situation of race diameter size, by increasing axial thickness, axial arranged one enclose to the free lasso of multi-turn and corresponding rolling element to reach any superimposed purpose.

Rolling element 3 must be that shape, size are identical in same circle, but shape, size and the material of the rolling element 3 in the difference circle can be identical, also can be different.

Claims

1. superposed type roller bearing, comprise circular outer ferrule (1), internal layer lasso (2), rolling element (3) and rolling element retainer, offer the bearing race (4) that cooperates with rolling element (3) at the internal surface of outer ferrule (1) and the outer surface of internal layer lasso (2), the internal surface of internal layer lasso (2) constitutes mounting hole (7), it is characterized in that: described rolling element (3) bearing be provided with two the circle or two the circle more than, separated by free lasso (5) between the two adjacent rings rolling element (3), in free lasso (5), outer surface is equipped with bearing race (51), in free lasso (5), the contacted rolling element of outer surface (3) matches with the supporting plane of this bearing race (51).

2. superposed type roller bearing according to claim 1, it is characterized in that: two-layer or two-layer above rolling element (3) is the stratiform stack on the radial circumference direction of bearing, and separate by one or several free lassos (5), be in outer field rolling element (3) be arranged on the rolling element 3 that is in internal layer directly over be that the ditch centre of curvature normal of the inside and outside raceway of free lasso (5) is overlapping on same circumferential surface.

3. superposed type roller bearing according to claim 1, it is characterized in that: the ditch centre of curvature normal of the inside and outside raceway by free lasso (5) launches to stagger in the axial direction, make described rolling element (3) bearing axially on be arranged at intervals with two circle or some circles, and the center of every circle rolling element (3) increases successively, dwindles or identical to the distance of bearing axis.

4. according to claim 1,2 or 3 described superposed type roller bearings, it is characterized in that: described rolling element (3) is spherical, cylindric, round table-like, coniform or needle-like, and the rolling element (3) on the difference circle is identical or inequality simultaneously.

5. superposed type roller bearing according to claim 1, it is characterized in that: between the outer surface of the internal surface of the outer ferrule (1) of bearing one side and internal layer lasso (2) or between the outer surface of the internal surface of the outer ferrule (1) of bearing dual-side and internal layer lasso (2), be provided with the seal ring (6) of integral type simultaneously, perhaps between the internal surface of the outer surface of internal layer lasso (2) and adjacent free lasso (5), between the outer surface of the internal surface of outer ferrule (1) and adjacent free lasso (5) and between each adjacent free lasso (5) split type seal ring (6) is set respectively.