CN101429972A - Offset thrust bearing - Google Patents

Abstract

A multiple-row eccentric thrust bearing (c1) is provided with two annular axial external components (c2) which are opposite with each other concentrically and are integrated, and an annular axial inner component (c3) which is clamped between the two axial external components concentrically. A plurality of rolling elements (c8) are clamped between the axial external components (c2) and the axial inner component (c3). The multiple-row eccentric thrust bearing (c1) is provided with rolling element guiding parts (c9) which is fixed on the axial inner component (c3) or the axial external components (c2) and restrains the movable range of each rolling element (c8) in a specified range.

Description

Eccentric thrust bearing

The application's denomination of invention that to be Koyo Seiko Co., Ltd proposed on 04 05th, 2004 is dividing an application of 200480011506.7 application for " eccentric thrust bearing ", application number.

Technical field

The present invention relates to eccentric thrust bearing.

Background technique

The single-row eccentric thrust bearing of existing public use has two and is a pair of seat ring and the rolling element between two seat rings.This bearing is clamped in the structure that is formed between two relative tabular seat rings by adopting the rolling element with a plurality of balls etc., two seat rings can to radially stagger mutually the ground eccentric motion and, also can between two seat rings, relatively turn round rolling.

Existing multiple row eccentric thrust bearing is made of a slice inboard race, two outboard race relative with the two sides of this inboard race and the two row rolling elements that are installed between these seat rings.In this multiple row eccentric thrust bearing, have two outboard race, two row rolling elements can support the axial load of twocouese by supporting rightabout axial load respectively mutually.

And, in the eccentric thrust bearing of public use, also have inboard race and outboard race to install in relative rotation.

In the single-row and multiple row eccentric thrust bearing that the disclosure is used, be arranged on randomly in the space between the seat ring as the ball of rolling element, perhaps ball is arranged in the space between the seat ring with full spherical attitude.

Existing eccentric thrust bearing has several problems.

First problem is the problem in the existing single-row eccentric thrust bearing.In above-mentioned existing single-row eccentric thrust bearing, though can support unidirectional axial load, that is, the axial load of compression rolling element direction can not be supported the axial load of twocouese.That is, can not support the axial load of the direction that two relative seat rings are drawn back.In order to support the axial load of twocouese, rolling element need be formed the multiple row thrust-bearing of multiple row (compound).But, under the situation that forms multiple row, have the problem (problem one) that bearing width (axial width of bearing) increases.

Second problem is, in existing multiple row eccentric thrust bearing, because seat ring part is big, therefore be difficult to guarantee the planeness of seat ring plane of trajectory orbital etc. sometimes, its processing is difficulty very, and has a following problem, that is, be not easy to carry out bearing maximization and, because the seat ring part of being made by the ferrous metal of Bearing Steel etc. is big, so it is heavy that bearing becomes, and is difficult to carry out lightweight.

The 3rd problem is that in existing multiple row eccentric thrust bearing, resistance is big during action, and energy loss is excessive.That is, as mentioned above, under the situation that rolling element is provided with at random or is provided with full spherical attitude, rolling element contacts with one another, the phase mutual friction, produces surface friction drag.As this countermeasure, though can consider the relativeness of using retainer to keep rolling element, in this case, owing to the slip between retainer and the seat ring produces surface friction drag.

The 4th problem be, in existing multiple row eccentric thrust bearing, following content do not studied, that is, and will be for eccentric and gaps between the inside and outside parts that are provided with are set definitely with respect to the eccentric scope of bearing.Therefore, gap between the inside and outside parts or seat ring etc. are excessive, and bearing formed large-scale.Cause the weight of bearing to increase thus or cost raising etc.

The present invention proposes in view of the above problems, is used to provide the eccentric thrust bearing of the axial load that can support twocouese.

And first purpose of the present invention provides bearing width littler than multiple row structure in view of above-mentioned first problem, can support the eccentric thrust bearing of the axial load of twocouese simultaneously.

Second purpose of the present invention, provides and carries out bearing maximization and light-weighted multiple row eccentric thrust bearing easily by dwindling the seat ring part in view of above-mentioned second problem.

The 3rd purpose of the present invention provides the certain distance that can relatively move in view of above-mentioned the 3rd problem, and the very little multiple row eccentric thrust bearing of loss when relatively moving.

The 4th purpose of the present invention be in view of above-mentioned the 4th problem, can freedom in relative rotation in the multiple row eccentric thrust bearing, forms gap between each parts more definitely by the eccentric scope with respect to bearing, and Miniaturizable and light-weighted bearing are provided.

Summary of the invention

Be used to realize that above-mentioned first purpose invention 1 is a kind of eccentric thrust bearing, it is characterized in that, when being provided with the first radial outside parts and being positioned at the first radially inner side parts of its radially inner side, with above-mentioned parts the second radial outside parts and the second radially inner side parts that are positioned at its radially inner side are set relatively, be positioned at along Zhou Fangxiang more than or equal to three locational primary importance on, in the rolling element that is arranged on by relative above-mentioned first radial outside parts and the above-mentioned second radially inner side parts clamping on the above-mentioned primary importance, with be positioned at along Zhou Fangxiang more than or equal to three position on and on the second place different with above-mentioned primary importance phase place, be arranged on rolling element on the said second position by the relative above-mentioned second radial outside parts and the first radially inner side parts clamping, the above-mentioned first radial outside parts and the first radially inner side parts are being provided with gap and can be to radially relatively moving with Zhou Fangxiang each other; And the above-mentioned second radial outside parts and the second radially inner side parts are being provided with gap and can be to radially relatively moving with Zhou Fangxiang each other, when above-mentioned first radial outside parts and the above-mentioned second radial outside parts are engaged by one, above-mentioned first radially inner side parts and the above-mentioned second radially inner side parts are engaged by one, and each specified part of above-mentioned rolling element is present on the same plane.。Like this, by being crisscross arranged with the corresponding parts of each parts of the eccentric thrust bearing of existing formation multiple row, can make as existing multiple row respectively to be listed as mutual axial distance approaching, can make the bearing of bearing width less than multiple row.Promptly, the first radial outside parts and the second radially inner side parts and by its clamping, be positioned at the eccentric thrust bearing part that can be used as first in existing multirow bearing row along the locational rolling element more than three of Zhou Fangxiang and 1. play a role, the second radial outside parts and the first radially inner side parts and by its clamping, 2. the eccentric thrust bearing part that is positioned to can be used as along the locational rolling element more than three of Zhou Fangxiang secondary series play a role.In the present invention 1, because the radial outside parts each other, the radially inner side parts engage by mutual one separately from each other, therefore, be equivalent to the axial load that existing multiple row eccentric thrust bearing part part 1. can support a direction, be equivalent to the axial load that eccentric thrust bearing part part 2. can support another direction.And, owing to make the phase place of the primary importance and the second place different, and between the two at radial outside parts and radially inner side parts, on movable in-plane, have the gap, therefore can adopt axial position each specified part approaching, rolling element of the rolling element that makes each row to be present in structure on the same plane.And radial outside parts and radially inner side parts can relatively move mutually.In case form said structure, then each parts of bearing are inseparable in addition, and the bearing that can be used as after the assembling provides.And the center of preferably all above-mentioned rolling elements is set up structure at grade.Like this, bearing can be formed single-row structure, the axial width that can make bearing is for minimum.

And, in the first above-mentioned invention, the above-mentioned first radial outside parts are made of with the first radial outside housing that all outer races have been installed the outer race of being cut apart on above-mentioned each primary importance that is arranged on the location, the above-mentioned second radial outside parts are made of with the second radial outside housing that these all outer races have been installed the outer race of being cut apart on above-mentioned each second place that is arranged on the location, the above-mentioned first radially inner side parts are made of with the first radially inner side housing that these all inner races have been installed the inner race of being cut apart on above-mentioned each second place that is arranged on the location, the above-mentioned second radially inner side parts are made of with the second radially inner side housing that these all inner races have been installed the inner race of being cut apart on above-mentioned each primary importance that is arranged on the location, and above-mentioned rolling element is clamped between above-mentioned outer race and the above-mentioned inner race simultaneously.In this case, because independent seat ring is cut apart respectively on each position of the rolling element that is arranged on the location, therefore can make each seat ring miniaturization.In case seat ring maximizes, then will be not easy to guarantee the precision of the planeness of seat ring plane of trajectory orbital, by making the seat ring miniaturization, make the maximization of bearing become easy.In addition and since cut down the seat ring that forms by bearing steel etc. partly and housing parts can utilize the low-gravity metal of aluminum alloy etc. or resin etc., therefore, can make the quantification in light weight of bearing integral.

In foregoing invention 1, but the relative shifting range of radial outside parts that produce by above-mentioned gap and radially inner side parts also can be roughly corresponding to the formation of the mobile range of rolling element.Like this, can make the gap between radial outside parts and the radially inner side parts and any gap of being arranged on the seat ring in order to ensure the mobile space of rolling element does not have unnecessary gap or forms inferior limit.Therefore, both the bearing miniaturization can be made, its eccentric scope can be further increased again.

And in foregoing invention 1, above-mentioned eccentric thrust bearing also can be following formation.Promptly, above-mentioned primary importance and the second place quilt five equilibrium respectively are arranged on N place (N is the integer more than or equal to 3), the above-mentioned first and second radial outside housings are same shape, its shape has the peripheral circles shape portion of the periphery that forms bearing, with from this peripheral circles shape portion towards radially inner side and in the inside tongue piece portion of Zhou Fangxiang equally spaced outstanding N, above-mentioned first and second radially inner side housing is same shape, its shape have circular of the interior week in the interior week that forms bearing and in this all circular portions towards radial outside and in the outside tongue piece portion of Zhou Fangxiang equally spaced outstanding N, on above-mentioned all outside tongue piece portion, above-mentioned inner race is installed on the same circumference, on above-mentioned all inside tongue piece portion, above-mentioned outer race is installed on the same circumference, simultaneously, all above-mentioned inner races and above-mentioned outer race are the disk-like member of same shape, the above-mentioned primary importance and the second place are on same circumference, and the phase place ground positioned alternate of 360/ (2N) degree that staggers mutually on Zhou Fangxiang.Like this, owing to can therefore, can more stably support the axial load of twocouese with the primary importance of rolling element and the second place at Zhou Fangxiang and radially be provided with equably, and, also can more stably support the moment load that produces by axial load from the eccentric axle of quilt.And, identical owing to each seat ring being formed, therefore can make each race components generalization.

In above-mentioned invention 1, also can be to have the structure of surrounding above-mentioned each seat ring first retainer guiding element on every side.Like this, the position adjustment of rolling element will be carried out easily.Promptly, though be not easy optimum position on the seat ring is adjusted in the position of rolling element, but applying under the state of light preload, by making bearing radially with on the Zhou Fangxiang carry out maximum relatively moving whole, the rolling element of dislocation will be by fastening on the first retainer guiding element, and suitably slide, carry out the position adjustment on seat ring.Therefore, can easily rolling element be arranged on the optimum position on the seat ring.And, can suppress by this first retainer guiding element that foreign matter is invaded and the outflow of oiling agent between relative seat ring.

In above-mentioned invention 1, can also be structure with the second single retainer guiding element that keeps the relative position relation between above-mentioned all rolling element.By like this, even under load partially acts on situation on the rolling element, rolling element can not move yet, produce dislocation.

Be used to realize that the invention 2 of above-mentioned second purpose is a kind of multiple row eccentric thrust bearing, it is characterized in that, have axially be oppositely arranged mutually and mutually one engage two axially outside housings and be clipped between these outside housings axially in side body, above-mentioned in axially on side body and each relative face two outside housings (housing axially), the part is provided with the inner race of cutting apart setting along Zhou Fangxiang more than or equal to three, simultaneously, on above-mentioned two axial outside housings, local respectively be provided with to cut apart more than or equal to three be arranged on the locational outer race relative with above-mentioned each inner race, and, rolling element is clamped in respectively between the relative above-mentioned inner race and above-mentioned outer race, and the mobile range of above-mentioned each rolling element on above-mentioned each seat ring of cutting apart setting all mutually about equally.Like this,,, carry out the processing of each seat ring easily, therefore, can carry out the maximization of bearing easily so can dwindle each seat ring because seat ring is cut apart, setting partly.Because seat ring is provided with more than three or three along Zhou Fangxiang, and rolling element is clamped between each seat ring, therefore axially interior side body and axial outside housing are supported on along three places of Zhou Fangxiang or more than three places, can support axial load and moment load.And, because as and the seat ring of rolling element contact beyond part axially in side body and axially outside housing separate with seat ring, therefore can not use the ferrous metal of Bearing Steel etc. and the low-gravity metal of use aluminum alloy etc. can make the bearing lightweight.And, since above-mentioned cut apart and the mobile range of above-mentioned each rolling element of local each seat ring that is provided with all mutually about equally, therefore, when whole mobile range moved, other all rolling elements also almost moved in whole mobile range at rolling element arbitrarily.The size of seat ring is the key element of the mobile range of decision rolling element, and is all roughly the same mutually by the mobile range that makes each rolling element like this, can need not to make the part in a plurality of seat rings to make all seat rings form minimum or inferior limit with increasing.And, adopting under the situation of above structure, each parts of bearing are inseparable, and the bearing monomer that can be used as after the assembling is supplied with.

In foregoing invention 2, but by above-mentioned axially in the relative shifting range that produces of gap between side body and the above-mentioned axial outside housing preferably roughly corresponding to the mobile range of above-mentioned rolling element.Like this, in case in relatively moving axially side body and axially outside housing, eliminate up to gap between the two, then rolling element also will move up to the gap that is arranged on the seat ring and roughly eliminate.Therefore, do not have unnecessary gap or form inferior limit, its result not only can make the bearing miniaturization, but also can increase eccentric scope.

In foregoing invention 2, be arranged on above-mentioned axially in side body and axially in each on each face of the outside housing outer race on its each face, all be configured with same PCD (on the same circumference), simultaneously, also can on Zhou Fangxiang, distribute equably.Like this, owing to upwards distributed equably at Zhou Fangxiang and footpath, therefore, can more stably support the axial load of twocouese and by the different diametrically and moment load of generation of the point of action of axial load as the rolling element of bearings point.And,, therefore, also can increase load capacity as bearing integral because the load that is applied on each rolling element also can equalization.At this moment, if above-mentioned each interior outer race all is the round-shaped of same diameter, and above-mentioned axial outside housing and axially interior side body are circular ring, then can form the bearing of the impartial structure of Zhou Fangxiang, can form the comprehensive bearing that can relatively move with certain width in the relative movable surface.And,, therefore can make the race components generalization because all interior outer races are the circles of same diameter.

In above-mentioned invention 2, can form to have and be arranged on the above-mentioned structure of the retainer guiding element around outer race in each.Like this, the position adjustment of rolling element will be carried out easily.Promptly, though be not easy optimum position on the seat ring is adjusted in the position of rolling element, but applying to bearing under the state of light preload, carry out maximum relatively moving by make progress in whole footpath (whole circumference), the rolling element of dislocation will be by fastening on the retainer guiding element, and suitably slides, carries out the position adjustment on seat ring.Therefore, will easily rolling element be arranged on the optimum position on the seat ring.And,, therefore also have the function that makes the bearing integral sealing owing to can suppress the intrusion of foreign matter between relative seat ring and the outflow of the oiling agent of lubricant oil or lubricating grease etc.

Be used to realize that the invention 3 of above-mentioned the 3rd purpose is a kind of biserial eccentric thrust bearing, have two mutually with one heart relatively and the circular axial outside parts that engaged by one and be clipped on one heart these two axially outside parts circular axial inner part each other, above-mentioned two axially outside parts have circular axial outside housing respectively and be installed in this axially tabular outer race of annulus on the inner face of outside housing, above-mentioned axial inner part have circular axially in side body and from this axially in side body radius vector to the outstanding tabular inner race of annulus that extends, simultaneously, a plurality of rolling elements are installed between the two sides and relative above-mentioned two outer races of above-mentioned inner race, it is characterized in that having and be fixed on above-mentioned axial inner part or axially on the parts of the outside, and the mobile range of each rolling element is limited in rolling element guide portion in the predetermined range.By like this, at the rolling element that is separated respectively by the rolling element guide portion each other, rolling element can not contact each other.And,, therefore also can not slide with these parts because the rolling element guiding element is fixed on axial inner part or the axial outside parts.Therefore, resistance is less under the rolling element situation about moving in the scope that is limited by the rolling element guide portion.And because axially inner part is circular with axial outside parts, and is provided with mutually with one heart, therefore gap between the two is the circular of certain width.And, because the moving range of each rolling element that is limited by the rolling element guiding element also is certain, therefore, can form the bearing of the certain distance that can relatively move.And the afore mentioned rules scope that above-mentioned rolling element guide portion is limited is if the circular scope of predetermined radius, then can be formed on the bearing of the certain distance that can relatively move on radially comprehensive, and is therefore very desirable.Though the rolling element guide portion limits the mobile range of each rolling element, meanwhile, also can easily each rolling element adjustment be arranged on the optimum position on the seat ring.That is, under the state that makes light preload effect, carry out maximum relatively moving by making bearing on whole circumference, the rolling element guide portion can make the rolling element of dislocation slide on seat ring, and rolling element is adjusted to the optimum position.

And each component parts of the bearing of foregoing invention 3 is inseparable, and the bearing monomer that can be used as after the assembling is supplied with.In addition, in this bearing, move in the scope that each rolling element can only be limited in the rolling element guide portion on being fixed on axial inner part, exceeding each rolling element of this scope can not move.Therefore, axial inner part and axial outside parts for example can not relatively rotate the angle more than or equal to specified value mutually.

And in foregoing invention 3, but the relative shifting range that is produced by the radial clearance between above-mentioned axial outside parts and the above-mentioned axial inner part is preferably roughly corresponding to the above-mentioned mobile range of rolling element.By like this, if relatively move axial inner part and axially outside parts, eliminate up to gap between the two, then rolling element will move to be present in and the rolling element guide portion between the position of roughly eliminating, gap.That is, if but axial inner part and axial outside parts are relatively moved in its whole relative shifting range, then each rolling element also will move in its roughly whole mobile range.Therefore, axially there is not unnecessary gap maybe can make unnecessary gap form inferior limit between inner part and the axial outside parts.Therefore, not only can make the bearing miniaturization, but also can increase eccentric scope.

And, in foregoing invention 3, the rolling element guide portion is circular, and on this rolling element guide portion, movable range limiting holes more than three or three is set on the same circumference and on the position of Zhou Fangxiang equalization, simultaneously, be preferably in a rolling element is set on each movable range limiting holes.By like this, because the rolling element that is set in the movable range limiting holes upwards is provided with equably at Zhou Fangxiang and footpath, therefore, the more stably axial load of spring bearing and moment load.And,, therefore, can not contact, produce friction between the rolling element because a rolling element only is set on a movable range limiting holes.

And, in foregoing invention 3, the rolling element that is limited by the rolling element guide portion move radially the preferably radial width of roughly corresponding above-mentioned inner race or outer race of distance.By like this, the radial width of inner race or outer race can be formed inferior limit.Therefore, can make bearing lightweight and reducing cost.

Be used to realize that the invention 4 of above-mentioned the 4th purpose is a kind of multiple row eccentric thrust bearing, have two mutually with one heart relatively and the circular axial outside parts that engaged by one and be installed in one heart these two axially outside parts circular axial inner part each other, above-mentioned two axial outside parts have circular axial outside housing and the tabular outer race of annulus that is installed on this axial outside housing respectively, above-mentioned axial inner part have circular axially in side body and from this axially in side body radius vector to the outstanding tabular inner race of annulus that extends, simultaneously, clamping has a plurality of rolling elements between the two sides of above-mentioned inner race and above-mentioned two outer races relative with this two sides, it is characterized in that, roughly corresponding by the relatively-movable scope that the radial clearance between above-mentioned axial outside parts and the above-mentioned axial inner part produces with the radially movable distance of above-mentioned rolling element.Because the inner race and two outer races relative with it of this bearing all are circular, and are continuous in a circumferential direction, therefore axially can freely relatively rotate between inner part and the axial outside parts.And, because each housing or the seat ring of axial inner part and axial outside parts all are circular, and are provided with one heart, therefore can be set to certain distance in the gap radially between axial outside parts on the whole circumference and the axial inner part.Therefore, can form structure on comprehensive axial with certain distance off-centre.

And, in invention 4, but roughly corresponding by the relative shifting range of the radial clearance generation between axial outside parts and the axial inner part with the radially movable distance of rolling element.Therefore, if radially the gap of its off-centre between axial outside parts and axial inner part roughly eliminated, then rolling element also will move up to the radial clearance elimination that is arranged on the seat ring on its eccentric direction.Therefore, unnecessary gap is eliminated and maybe can be made unnecessary gap be in inferior limit, and its result both can make the bearing miniaturization, can increase eccentric scope again.

In foregoing invention 4, above-mentioned a plurality of rolling element is provided with at interval with approximate equality on Zhou Fangxiang, have the circular retainer that not only keeps this relative position relation but also rolling element can free rollably be kept simultaneously, preferably guarantee the above-mentioned radially movable distance of rolling element by the radial clearance between this retainer and above-mentioned axial inner part and the above-mentioned axial outside parts.By like this, distributed by the ground of approximate equality on Zhou Fangxiang as the rolling element of the strong point of bearing, and, therefore can more stably support axial load and moment load owing to keep relative position relation between the rolling element by retainer.And, can make the load equalization that is applied on each rolling element, increase load capacity as bearing integral.And owing to have radial clearance between retainer and above-mentioned axial inner part and above-mentioned axial outside parts, therefore, rolling element can be to radially moving.And, by this retainer, can easily each rolling element be arranged on the optimum position on the seat ring.That is,,, can easily carry out the position adjustment by on radially full week, carrying out maximum off-centre under the state that applies light preload to bearing though be not easy suitably to adjust the position of rolling element on seat ring.Under the situation about staggering in the position of rolling element, by making retainer with axial inner part or axial outside parts butt and on seat ring, slide the position adjustment that to carry out rolling element and accommodate the retainer of this rolling element with rolling element.

Description of drawings

Fig. 1 is the exploded perspective view of structure of eccentric thrust bearing of a mode of execution of expression invention 1.

Fig. 2 is the sectional view of axial section of eccentric thrust bearing of a mode of execution of expression invention 1.

Fig. 3 is that the A-A profile position from Fig. 2 removes the second retainer guiding element, sees the main position front view of bearing inside.

Fig. 4 is the sectional view along the B-B line of Fig. 3 of eccentric thrust bearing of a mode of execution of expression invention 1.

Fig. 5 is the stereogram (partial sectional view) of bearing of the mode of execution of expression invention 2.

Fig. 6 is the sectional view of bearing of the mode of execution of expression invention 2.

Fig. 7 is in the bearing of invention 2 mode of execution, sees the front view at the main position of bearing to the direction of arrow from the position of the A-A section of Fig. 6.

Fig. 8 is the exploded perspective view of eccentric thrust bearing of first mode of execution of expression invention 3.

Fig. 9 is the sectional view of eccentric thrust bearing of first mode of execution of expression invention 3.

Figure 10 is the sectional view of bearing of second mode of execution of expression invention 3.

Figure 11 is the sectional view of bearing of the 3rd mode of execution of expression invention 3.

Figure 12 is the exploded perspective view of eccentric thrust bearing of first mode of execution of expression invention 4.

Figure 13 is the sectional view of eccentric thrust bearing of first mode of execution of expression invention 4.

Figure 14 is the sectional view of eccentric thrust bearing of second mode of execution of expression invention 4.

Figure 15 is the sectional view of eccentric thrust bearing of the 3rd mode of execution of expression invention 4.

Embodiment

Below with reference to the accompanying drawings, describe with regard to embodiments of the present invention.

Fig. 1 is the exploded perspective view of formation of eccentric thrust bearing a1 of a mode of execution of expression invention 1, and Fig. 2 is the sectional view of the axial section (semi-section from the center to the periphery) of central position this bearing of expression a1, by ball a8.The Zhou Fangxiang position of the section of this Fig. 2 is as the central position of the inside tongue piece portion a2b of the first radial outside housing a2.In addition, Fig. 2 is the state (hereinafter referred to as standard state) that expression ball a8 does not move to any direction.As shown in Figure 1, the radial outside parts that constitute the periphery etc. of this bearing a1 are made of the first radial outside parts and the second radial outside parts.The first radial outside parts are made of the first radial outside housing a2 and the discoideus outer race a6 that is installed on this housing a2.The second radial outside parts are made of the second radial outside housing a3 and the discoideus outer race a6 that is installed on this housing a3.The first radial outside housing a2 has the peripheral circles shape a2a of portion of the periphery that forms bearing a1 and four equally spaced outstanding inside tongue piece portion a2b of 90 degree ground from this peripheral circles shape a2a of portion towards radially inner side and at the Zhou Fangxiang interval.The second radial outside housing a3 and the first radial outside housing a2 are same shape, have the peripheral circles shape a3a of portion and four inside tongue piece portion a3b equally.This first radial outside housing a2 is relative with the state of the 45 degree phase places that only stagger at Zhou Fangxiang with the second radial outside housing a3.Therefore, mutual tongue piece portion a2b is not oppositely arranged with a3b but 45 degree ground settings at interval on different mutually Zhou Fangxiang positions.

The radially inner side parts that constitute interior week etc. of this bearing a1 are made of the first radially inner side parts and the second radially inner side parts.The first radially inner side parts are made of the first radially inner side housing a4 and the discoideus inner race a7 that is installed on this housing a4.The second radially inner side parts are made of the second radially inner side housing a5 and the discoideus inner race a7 that is installed on this housing a5.Be positioned at that the radially inner side of the first radial outside housing a2, the first radially inner side housing a4 that constitutes week etc. of this bearing a1 have week circular the a4a in the week that forms bearing a1 and from this week circular a4a towards radial outside and at Zhou Fangxiang four uniformly-spaced outstanding outside tongue piece portion a4b of 90 degree ground at interval.And the second radially inner side housing a5 and the first radially inner side housing a4 that are arranged on the radially inner side of the second radial outside housing a3 are same shape, week circular a5a and four inside tongue piece portion a5b in having equally.This first radially inner side housing a4 and state relative form of the second radially inner side housing a5 to spend in Zhou Fangxiang relative differences 45.Therefore, mutual tongue piece portion a4b is not oppositely arranged with a5b but 45 degree ground settings at interval on different mutually Zhou Fangxiang positions.

Four inside tongue piece portion a2b of the first radial outside housing a2 and four outside tongue piece portion a5b of the second radially inner side housing a5 on the identical primary importance a21 of phase place mutually relatively.And, four inside tongue piece portion a3b of the second radial outside housing a3 and four outside tongue piece portion a4b of the first radially inner side housing a4 on the identical second place a22 of phase place mutually relatively.And, on each opposing side of all inside tongue piece portion a2b and a3b, all be provided with the discoideus outer race a6 of a slice (totally 8) on each tongue piece portion.Equally, on the opposing side of all outside tongue piece portion a4b and a5b, all be provided with a slice (totally 8) and the identical shaped discoideus inner race a7 of outer race a6 on each tongue piece portion.And, between outer race a6 and inner race a7, between each seat ring, clamp each one, totally 8 as the ball a8 of rolling element.The center of all ball a8 is set up at grade, and present embodiment is single-row eccentric thrust bearing.

As depicted in figs. 1 and 2, each ball is separately inserted respectively among the retainer a10 cylindraceous.And on all outer race a6 and inner race a7, the first retainer guiding element a11 of annular is embedded in around it outward, surround in outer race a6, a7 (with reference to Fig. 2).It is last and more side-prominent to rolling element than seat ring plane of trajectory orbital that this first retainer guiding element a11 is embedded in each interior outer race a6, a7 outward.Therefore, the wall vertical of formation on every side of the inner peripheral surface of first retainer guiding element a11 outer race a6, a7 in each with the seat ring plane of trajectory orbital.And, be used to keep its center to be set at relative position relation between all the retainer a10 of all ball a8 on the same plane, keep by one second retainer guiding element a12 as the plectane of general toroidal.On this second retainer guiding element a12, Zhou Fangxiang is provided with the totally 8 retainer patchhole a12a of place every 45 degree.Retainer a10 cylindraceous is embedded in this retainer patchhole a12a and goes up (with reference to Fig. 2).By these second retainers guiding element a12 and retainer a10, all ball a8 are equally spaced kept.Under moment load was applied to situation on the bearing a1, load acted on the rolling element partially, owing under the situation of should a part of ball a8 of inclined to one side load floating from seat ring, can expect that this part ball a8 will move.Even but in this case, by the second retainer guiding element a12, the situation that a part of ball a8 moved, caused dislocation can not take place yet.In addition, in the outer peripheral portion of the second retainer guiding element a12, Zhou Fangxiang equally spaced has the recess a12c of circular arc, and this is the tool withdrawal groove corresponding to the screw a15 part that links two radial outside housings.

Fig. 3 is that the A-A profile position from Fig. 2 removes the second retainer guiding element a12, sees the front view (only representing for 1/4 week) at the main position of bearing a1 inside in the direction of arrow.This Fig. 3 also is a standard state, and, dot the second retainer guiding element a12.Fig. 4 is the sectional view of this bearing a1 standard state on the section of B-B position of presentation graphs 3.As Fig. 2～shown in Figure 4, the first radially inner side housing a4 is set at the radially inner side of the first radial outside housing a2, and mutual axial position is roughly the same.Equally, the second radially inner side housing a5 is set at the radially inner side of the second radial outside housing a3, and mutual axial position is roughly the same.And as shown in Figure 4, the first radial outside housing a2 and the second radial outside housing a3 are engaged by screw a15 one near its peripheral circles shape a2a of portion and a3a.And the first radially inner side housing a4 and the second radially inner side housing a5 are engaged by screw a16 one near week circular a4a and the a5a in these.This screw a15 and a16 are respectively arranged with a plurality of on the position of Zhou Fangxiang equalization.In addition, in Fig. 1, omitted the expression of this screw a15 and a16 part.

As shown in Figure 1, the position is set is the primary importance a21 that is positioned everywhere to the Zhou Fangxiang that is installed in four outer race a6 and four inner race a7 relative with it on the inside tongue piece portion a2b of the first radial outside housing a2 (being installed in four inner race a7 on the outside tongue piece portion a5b of the second radially inner side housing a5).And it is the second place a22 that is positioned everywhere that the Zhou Fangxiang that is installed in four outer race a6 and four inner race a7s relative with it on the inside tongue piece portion a3b of the second radial outside housing a3 (being installed in four inner race a7 on the outside tongue piece portion a4b of the first radially inner side housing a4) is provided with the position.As shown in Figure 3, this primary importance a21 and second place a22 and each seat ring on same circumference a23 and the mutual difference angle α of Zhou Fangxiang be 45 degree and the phase place of this angle [alpha] that staggers respectively be arranged alternately.

Like this, stagger mutually by the position that makes primary importance a21 and second place a22, can make the axial distance between each row of two row ball a8 of existing multirow bearing more approaching, can adopt each specified part to be present in structure on the same plane for all ball a8.And can carry out single-rowization.And, can not form the axial load that multiple row supports twocouese structurally.That is,, then can carry out single-rowization with on Zhou Fangxiang, being crisscross arranged corresponding to parts as each parts of the eccentric thrust bearing that has multiple row now if constitute like this.Promptly, the first radial outside housing a2 and the second radially inner side housing a5 and be clipped on interior outer race a7, a6 and ball a8 between it, 1. the first row eccentric thrust bearing part that can be used as in the existing multirow bearing plays a role, the second radial outside housing a3 and the first radially inner side housing a4 and be clipped on interior outer race a7, a6 between it and 2. secondary series eccentric thrust bearing part that ball a8 can be used as in the existing multirow bearing plays a role.Since radial outside housing a2, a3 each other and radially inner side housing a4, a5 separately from each other mutually one engage, therefore be equivalent to the axial load that existing multiple row eccentric thrust bearing part part 1. can support a direction, be equivalent to the axial load that eccentric thrust bearing part part 2. can support another direction.And, by the single-row structure of such formation, compare with the situation of multiple row, can dwindle bearing width.In addition, the present invention 1 eccentric thrust bearing is because in its eccentric scope, can and move radially at Zhou Fangxiang,, can not surpass the rotation (above the relatively rotating of predetermined angular) of this scope though therefore also can in this mobile range, relatively rotate.

And each the outer race a6 and the inner race a7 of disk-like member are separately positioned on each position location of primary importance a21 and second place a22.In addition, as shown in Figure 2, by on each seat ring a6, a7, at its periphery step difference a9 is set, can be with axial outer side surface as protuberance, on each tongue piece portion, be provided with and the corresponding recess of this protuberance on the other hand, concavo-convex by making up these, can make up each seat ring a6, a7 and each tongue piece portion a2b, a3b, a4b, a5b.

As shown in Figures 2 and 3, between the outer circumferential face a5c of the inner peripheral surface a3c of the second radial outside housing a3 and the second radially inner side housing a5, spread all over whole circumference gap aK1 (representing with hatching in Fig. 3) is set.As shown in Figure 3, the width of gap aK1 is apart from aL on the radially outermost position of outside tongue piece portion a5b diametrically, on the radially interior position of inside tongue piece portion a3b, is apart from aM diametrically.And roughly the same on the whole for the width that makes this gap aK1, the contour shape of the inner peripheral surface a3c of the second radial outside housing a3 is for roughly imitateing the contour shape of the outer circumferential face a5c of the second radially inner side housing a5.Its result, the width of gap aK1 spread all over whole more than or equal to aL smaller or equal to aM.And, also note guaranteeing the intensity of radially inner side housing a4, a5 and set apart from aM.Best apart from aM with identical apart from aL.Because this gap aK1 is arranged, therefore the second radial outside housing a3 and the second radially inner side housing a5 can be arranged on the same position of axial direction, that ball a8 is formed is single-row, and, the second radially inner side housing a5 and the second radial outside housing a3 be at the radially comprehensive approximate distance aL that relatively moves to, and Zhou Fangxiang also can relatively move mutually (relatively rotating).The front end of the outside tongue piece portion a5b of the second radially inner side housing a5 forms semi-circular shape (with reference to Fig. 3), this is the round-shaped corresponding shape with inner race a7, and being between the second radially inner side housing a5 and the second radial outside housing a3, is guaranteeing apart from the stroke that relatively moves that is roughly aL on every side of center in the normal place with ball a8.In addition, the tip portion of the inside tongue piece portion a3b of the second radial outside housing a3 also forms circular-arc, this is the shape corresponding shape with outer race a6, and be between the second radially inner side housing a5 and the second radial outside housing a3, the normal place with ball a8 be the center around guarantee the distance stroke that relatively moves of aL roughly.Like this, the relative mobile range of the scope of gap aK1 decision radially inner side housing a5 and radial outside housing a3.

Be present in as the ball a8 of rolling element between the inner peripheral surface a11a of the outer circumferential face a10a of the retainer a10 that accommodates this ball a8 and the first retainer guiding element a11, by being that the gap aK2 (with reference to Fig. 3) of the circular width aR at center can move with ball a8.Be that the removable outer circumferential face a10a up to retainer a10 of ball a8 contacts with the inner peripheral surface a11a of the first retainer guiding element a11.In the present embodiment, the internal diameter of the diameter of the area of each seat ring a6, a7 (diameter), ball a8 and retainer a10, the first retainer guiding element a11 determines movably scope of ball a8.Like this, the mobile range of the scope of gap aK2 decision ball a8.

In the present embodiment, the clearance distance aK2 (the clearance distance aR radially under the standard state) that accommodates between the inner peripheral surface a11a of the outer circumferential face a10a of retainer a10 of ball a8 and the first retainer guiding element a11 is half of above-mentioned clearance distance aL.That is, the relation of following formula is set up.

aL＝2(aR)

Form like this is that the displacement distance of corresponding ball a8 is half of relative movement distance of seat ring.Like this, make apart from aR to set the diameter of outer race a6 and inner race a7 apart from half ground of aL.

Like this, but the mobile range of the ball a8 of the clearance distance aK2 generation between the inner peripheral surface a11a of the relative shifting range between these housings that produce by the gap aK1 between the second radially inner side housing a5 and the second radial outside housing a3 and outer circumferential face a10a by retainer a10 and the first retainer guiding element a11 is roughly corresponding.In other words, but both relative shifting range that produces by the gap aK1 between inner and outer shell a5, the a3 radially is roughly consistent with the eccentric scope of bearing a1.Promptly, in case ball a8 moves, up to the outer circumferential face a10a of the retainer a10 that accommodates ball a8 and the inner peripheral surface a11a butt of the first retainer guiding element a11, the second radially inner side housing a5 and second radial outside housing a3 butt roughly simultaneously then, unnecessary gap is formed inferior limit.Therefore, not only can make bearing a1 miniaturization, but also can enlarge eccentric scope to greatest extent.

Around ball a8 unnecessary gap not being set is meant and increases each seat ring a6, a7 within bounds.Therefore, can guarantee eccentric to greatest extent scope with little seat ring a6, a7.In addition, as shown in Figure 2, clearance distance aS between the inner peripheral surface of the peripheral circles shape a2a of portion, the a3a of the outer circumferential face of the second retainer guiding element a12 and two radial outside housings is bigger slightly apart from aR than above-mentioned, is mutually non-touching state in the eccentric scope of bearing a1.

And in the present embodiment, all outer race a6 and inner race a7 are same diameter, identical shaped plectane, and under standard state, all seat rings are set at a23 on the same circumference (with reference to Fig. 3).Like this, in all position locations, that is, on all primary importance a21 and second place a22, each mobile range of each ball a8 is corresponding with the eccentric scope of bearing a1.That is, comprehensive in free cheek, in case make bearing a1 move to the boundary of eccentric scope, then all ball a8 will move to the roughly boundary of each mobile range.That is, can make all interior outer race a6, a7 generalization with same parts, and, its size is formed on inferior limit.

Though in this pass with the second radial outside housing a3 and the second radially inner side housing a5 is that example is illustrated, the relation of the first radial outside housing a2 and the first radially inner side housing a4 also is same structure.

For with ball a8 on the central position that is arranged on outer race a6 and inner race a7 under the standard state as illustrated in fig. 2, after with bearing a1 assembling, can radially with on the Zhou Fangxiang make ball a8 carry out maximum relatively moving all under the state that apply light preload to bearing a1.If operation like this, the retainer a10 of the ball a8 of maintenance dislocation contacts with the first retainer guiding element a11, ball a8 slides on seat ring, and the position of ball a8 is adjusted to the central position that is positioned at inside and outside seat ring a6, a7 under standard state.Like this,, the position adjustment of ball a8 can be carried out easily, especially,, also the position adjustment of ball a8 can be carried out easily even under the state after bearing a1 is assembled by the first retainer guiding element a11 is set.

In addition, being used as build-up member at bearing a1 is assembled under bearing a1 other situations of installing in addition, promptly, in this device, for example have the device of the relative shifting range of restriction bearing a1 such as using rubber or spring, with this under the situation of confined scope less than the eccentric scope of bearing a1, bearing a1 does not interfere between its component parts.

Though the shape for outer race a6 and inner race a7 is not particularly limited, in the present embodiment, this seat ring a6, a7 are cut apart the seat ring segmenting structure of each position location that is arranged at primary importance a21 and second place a22.If constitute like this, then owing to can reduce the roll part of contact of ball a8, that is, and the seat ring part made from the iron type materials of Bearing Steel etc. usually, so can reduce cost.And, owing to keep these seat rings a6, a7 and radially inner side housing a4, a5 and radial outside housing a2, a3 that each seat ring one is connected contacts with ball a8, so can use the light metal of aluminum alloy etc.Therefore, under the situation that forms such seat ring segmenting structure, the size that can dwindle each seat ring a6, a7 can make bearing a1 lightweight, and is therefore very desirable.And a highest wisdom bearing is maximized, and then seat ring a6, a7 also have the trend that is maximized, in case but seat ring is maximized, then be used to keep the unusual difficulty of processing of the planeness of seat ring plane of trajectory orbital.As present embodiment,, then can carry out the miniaturization of each seat ring size and the maximization of bearing integral easily if seat ring is cut apart.

At this, above-mentioned primary importance a21 and second place a22 are positioned respectively everywhere, promptly, more than three places, and since the above position in these three places or three places not point-blank, but, therefore be carried out support more than 3 or 3 respectively by ball a8 two opposite groups radially inner side housing a4, a5 and radial outside housing a2, a3 along Zhou Fangxiang.Therefore, the axial load of twocouese can be supported, also moment load can be supported simultaneously.Therefore, this primary importance a21 and second place a22 are not limited to be positioned everywhere respectively as present embodiment, get final product so long as three places or three places are above.Preferably as present embodiment,, these three places or the position location more than three places are arranged on Zhou Fangxiang upward above in 180 scopes of spending, and all are not arranged in the scope of Zhou Fangxiang 180 degree (semicircle) for primary importance a21 and second place a22.If be provided with like this, then the strong point owing to relative face disperses by Zhou Fangxiang, therefore can support big moment load, can disperse axial load by equalization in the face simultaneously, make the load that is applied to each ball a8 impartial more, and is therefore very desirable.

And, in the present embodiment, the quantity of the position location of primary importance a21 and second place a22 is respectively the N place (N is the integer more than 3) of equivalent amount, and, primary importance a21 and second place a22 on same circumference a23 (with reference to Fig. 3), and on Zhou Fangxiang every 360/ (2N) degree stagger phase place, alternately be provided with.If be provided with like this,, therefore can support the axial load and the moment load of twocouese expeditiously because primary importance a21 and second place a22 upwards disperse equably, locate at Zhou Fangxiang and footpath.

And this moment, the moving range of each ball a8 is identical.Like this, the size of whole seat ring a6, a7 can be formed minimal same shape, can further make bearing a1 lightweight.In addition, though N is preferably the integer more than 3 or 3, if too much, be used to then to guarantee that the clearance distance between the parts of eccentric scope narrows down, simultaneously, number of spare parts increases, and it is complicated that structure is tending towards, and therefore N is preferably 4～6 usually.From the equilibrium of moment load and eccentric scope, N is 5 best.

In the present invention 1, retainer a10 is not essential.But,,, then can suppress outflow to the oiling agent of peripheral lubricant oil of supplying with of ball a8 or lubricating grease etc. if use the retainer a10 that accommodates each ball a8 as present embodiment.And as mentioned above, the first retainer guiding element a11 carries out the position adjustment of ball a8 easily, and by being used in combination the retainer a10 and the first retainer guiding element a11, then will make this position adjustment more reliable.That is, outer circumferential face by making retainer a10 and the inner peripheral surface butt of the first retainer guiding element a11 carrying out the position when adjusting, can positively make ball a8 slide.And, by the first retainer guiding element a11, can be suppressed at that foreign matter invades between the seat ring around each seat ring a6, a7, also have function as the sealed member of bearing integral.

And, by the combination of the retainer a10 and the second retainer guiding element a12,, also can keep the relative position relation between each ball a8 even the thickness of the second retainer guiding element a12 is thinner.That is,, therefore,, also can keep ball a8 really even the thickness of the second retainer guiding element a12 does not reach about the diameter of ball a8 because retainer a10 is housed among the retainer patchhole a12a of the second retainer guiding element a12.In addition, retainer a10 can be with the resin manufacture of phenolic resin etc., and the second retainer guiding element a12 can be with resin manufacture such as polytetrafluoroethylene (PTFE)s.And the first retainer guiding element a11 also can be a resin etc., but as mentioned above, under the situation about adjusting in the position that the first retainer guiding element a11 is used for ball a8, need bear ball a8 pressing force, ball a8 is slided.Therefore, this material is the high material of rigidity to a certain extent preferably, for example is preferably aluminum alloy etc.

Though the shape of rolling element without limits, as the enforcement mode,, be desirable then forming aspect the less bearing of the comprehensive rolling resistance in the plane of trajectory orbital if all rolling elements are all formed ball a8.And, the quantity of rolling element is not particularly limited, can a plurality of rolling elements be set at every place, each position location of the above-mentioned primary importance and the second place, also can at every place, each position location a rolling element be set as present embodiment.At least at every place, each position location a rolling element is set.

In addition, also can baffle plate be set in the axial sides of the present invention 1 bearing.Baffle plate suppresses the intrusion of foreign matter in bearing by a side or two sides that cover this bearing, and also helps to suppress the oiling agent outflow.This baffle plate preferably is set to not limit the eccentric scope of bearing.For example baffle plate can be made of internal baffle and exterior siding, internal baffle be installed in the radially inner side housing go up in circular of interior week and from this ring-like discoideus towards the radial outside extension, exterior siding is to be installed in the peripheral circles shape portion of radial outside housing and from this ring-like discoideus towards the radially inner side extension.At this moment, interior exterior siding and axially is being provided with both are overlapping under standard state, on concentric position (for example exterior siding being overlapped the axial outside of internal baffle).Make overlapping stratiform gap between the two little as far as possible, guarantee protection against dust.And the internal diameter of exterior siding is compared with external diameter with the internal diameter of internal baffle with external diameter, respectively more than or equal to both relative movement distance (in the mode of execution apart from aL), owing to can be not the eccentric scope of bearing not be limited.And, in order to keep the parts the relative position of each other relation in the above-mentioned standard state, can be additional with applying preload between the inside exterior part of screw by preload, suppress the slip between rolling element and the seat ring.

In addition, the radial outside parts of the present invention 1 bearing or radially inner side parts are not limited to circle (circular), also such as polygon.Be under polygonal situation, in this specification said radially with Zhou Fangxiang be meant this polygonal circumcircle radially and Zhou Fangxiang.

In the above-described embodiment, the single row bearing that is set up at grade with the center of all ball a8 is an example, and it is self-evident that the present invention 1 is not limited in so single-row structure.That is, each specified part of rolling element may reside on the same plane, and in this scope, at rolling element each other, also can stagger in axial position.In existing multiple row structure, owing in each axial clearance that is listed as of rolling element, need to exist seat ring at least, so the axial thickness of bearing increases.

As mentioned above, invention 1 is owing to be that the parts that will be equivalent to each parts of existing multiple row airframe bearing are crisscross arranged, and each specified part of rolling element is present on the same plane, therefore can provide both to make bearing width, can support the eccentric thrust bearing of the axial load of twocouese again less than the multiple row structure.

Below, describe with regard to inventing 2 mode of execution with reference to the accompanying drawings.

Fig. 5 is the stereogram of the bearing b1 of expression present embodiment.Fig. 6 is the sectional view (omitting from the diagram of the lower half portion in axle center) of expression this bearing b1, and its all directions position is for by the position as the center of the ball b6 of rolling element.Fig. 7 is a front view (figure in 1/4 week) from the position of the A-A section of Fig. 6 to the direction of arrow that see the main position of bearing from.

As shown in Figure 5 and Figure 6, this bearing b1 have two circular axial outside housing b2, the b2 that axially are oppositely arranged mutually and be clipped on these two axially between outside housing b2, the b2 circular axially in side body b3.Therefore, two axial outside housing b2, b2 are relative with the axial bi-side of axially interior side body b3 respectively.These two axially outside housings be same shape, and with respect to side body b3 in axially towards relative symmetrically, and left a plurality of screw b11 one that equally spaced are arranged on Zhou Fangxiang near the edge portion of all sides within it and engaged.Be separately installed with 6 slice round-shaped inner race b5s on the side body b3 two sides (opposing side of housing axially) relative with the inner side surface of axial outside housing b2, b2 in axially.These inner races b5 on each face (two sides) relative with axial outside housing of side body b3, is cut apart, is provided with partly (being Zhou Fangxiang 60 degree at interval) with same PCD (on the same circumference) and in the Zhou Fangxiang equalization in axially.In addition, on the inner side surface of two axial outside housing b2, the part is provided with 6 round-shaped outer race b4 respectively.On each face of these outer races b4 inner side surface of housing b2 outside axially, cut apart, be provided with partly (being Zhou Fangxiang 60 degree at interval) with same PCD (on the same circumference) and in the Zhou Fangxiang equalization.And all inner race b5 and outer race b4 form the round-shaped of same diameter.

In addition, in Fig. 5, in order to see the formation of each parts easily, form following figure, promptly, with the excision of the upside half cycle of axial outside housing b2 and suitably remove the outer race b4 that is installed on this cut-out, and make axial outside housing b2 to axial in side body b3 relatively move to inboard, drawing below.Also form in addition and remove for the part of the outer side surface that covers axial outside housing and the figure of the aftermentioned baffle plate b10 (with reference to Fig. 6) that is provided with.And Fig. 6 is different with Fig. 5 with Fig. 7, is the sectional view of the neutral condition (hereinafter referred to as standard state etc.) that do not move to any direction of ball b6.

As shown in Figure 6, under standard state, each inner race b5 and each outer race b4 are respectively in same position, relative in the axial direction.And, on the tow sides of side body b3 in axially (opposing side of housing axially), inner race b5 that position (phase place) is set is identical.Therefore, two axially the mutual outer race b4 of outside housing b2, b2 that position (phase place) is set is also identical.In addition, as Fig. 6 and shown in Figure 5, discoideus interior outer race b4, b5 makes axial outer side surface form convex by seat ring step difference b13 is set at its periphery, on the other hand, be provided with and this protuberance corresponding concave part on the side body b3 at each axial outside housing b2 with axially, concavo-convex by making up these, interior outer race b4, b5 are installed on axial outside housing b2 and the axially interior side body b3.

Under standard state, be set at the center of outer race b5, b4 in circular each as the ball b6 of rolling element.The corresponding interior outer race group of ball b6 is used 12 altogether, constitutes every at grade row 6 multirow bearings of totally two row are set.Each ball b6 is housed in respectively in each columnar retainer b7, and, on each inner race b5 and outer race b4, be embedded with the retainer guiding element b8 of annular outside respectively, and this retainer guiding element b8 is provided with side-prominently to each ball b6 more than the plane of trajectory orbital of each interior outer race b4, b5.If have this retainer guiding element b8, then make ball b6 under standard state, be positioned at the center of circular each outer race b5, b4 easily.Promptly, applying under the state of light preload to bearing b1 with screw (do not have and illustrate) etc. by preload is additional, in case carry out maximum relatively moving along whole radially (full week), then on retainer guiding element b8, and the one side one side of suitably sliding on seat ring is carried out the position adjustment to Cuo Wei rolling element by fastening.Like this, under the state after bearing b1 is assembled by retainer guiding element b8, can adjust the position of each ball b6 very easily.

Because interior outer race b4, b5 are cut apart, are provided with partly in the position that respectively is provided with of ball b6, therefore, compare when not cutting apart, can dwindle each seat ring.Like this, owing to carry out the processing of seat ring easily, therefore carry out the maximization of bearing easily.And, because the seat ring that contact with ball b6 partly uses the ferrous metal of Bearing Steel etc., and on the other hand axially in side body and axially outside housing can use the light metal of aluminum alloy etc., so can make the bearing lightweight.

Under standard state, interior outer race b4, b5 are set at all that same circumference b15 (with reference to Fig. 7) goes up, PCD is identical, and at interval angle b α (with reference to Fig. 7) equalization be distributed on the Zhou Fangxiang.In the present embodiment, angle b α is 60 degree.By like this, since become bearing b1 the strong point ball b6 by Zhou Fangxiang and radially equably the distribution, therefore can more stably support the axial load and the moment load of twocouese, and, can make the load homogenization that is applied to as on each ball b6 of rolling element.

In addition, under standard state, same circumference b15 goes up (with reference to Fig. 7), PCD is identical because all interior outer race b4, b5 are set at, and, outer race b4, b5 are the round-shaped of same diameter in all, and the mobile range of each the ball b6 in each that therefore cut apart, the part is provided with on outer race b4, the b5 all equates.That is, each ball b6 is when its whole mobile range moves arbitrarily, and other all ball b6 also can move along each mobile range integral body.Like this, in the present embodiment, make the size of a plurality of interior outer race b4, b5 integral body form minimum.

And, in the present embodiment, owing to housing b2 outside axial and axially interior side body b3 are circular and setting with one heart, so the gap of the outer circumferential face b2c of flange inner peripheral surface b3c and axial outside housing b2 is have equal width on whole circumference circular.And, the mobile range of each ball b6 also with each in the round-shaped circular scope that forms accordingly of outer race b4, b5.Therefore, this bearing b1 carries out relatively moving of certain width with respect to comprehensive in the movable surface, and, become the impartial bearing b1 that constitutes on Zhou Fangxiang.And because all interior outer race b4, b5 are the circles of same diameter, therefore outer race b4, b5 are identical race components in each by making, and can make all interior outer race b4, b5 become universal component.

The outer periphery portion of side body b3 is provided with base portion b3a from plate shape roughly towards two axially extended flange b3b, b3b (with reference to Fig. 6) in axially.Axial end at this flange b3b, b3b is provided with the circular baffle plate b10 that extends from this end towards radially inner side.This baffle plate b10 is circular thin plate, and its axial position is the position that overlaps with the outside of axial outside housing b2 with state almost very close to each other.The axial end of the flange b3b of side body b3 in this baffle plate b10 is fixed on axially, together unfixing with axial outside housing b2.Therefore, baffle plate b10 simultaneously keeps can relatively moving in movable surface mutually with the almost gapless coincidence status of outer side surface, the one side of axial outside housing b2, helps to suppress foreign matter and invades in the bearing b1.And, roughly consistent by the axial end position that makes flange b3b with the axial position of the outer side surface of axial outside housing b2, baffle plate b10 can be set.

Like this, because the axial end position of the flange b3b of side body b3 is roughly consistent with the axial position of the outer side surface of axial outside housing b2 axially, therefore, as the flange inner peripheral surface b3c of the inner peripheral surface of the flange b3b of side body b3 in axially and axially the outer circumferential face b2c of outside housing b2 radially have mutual relative part.Therefore, if the relative movement distance of bearing is little, then be in the position relation that can be in contact with one another.As shown in Figure 6, between the outer circumferential face b2c of this flange inner peripheral surface b3c and axial outside housing b2, under standard state, the gap of distance b L is present in whole footpath upwards.In addition, for the radially the most inboard inner peripheral surface b3d that is positioned at circular axial side body b3 and axially the linking department outer circumferential face b2a of outside housing b2 also be if the relative movement distance of bearing is little, then will be in the state that can be in contact with one another.As shown in Figure 6, under standard state, between these, the gap of this distance b M is present in whole footpath upwards.This distance b M and above-mentioned distance b L are roughly the same, and distance b M is only than the long slightly error size of inserting the bolt hole that is connected with screw b11 of distance b L.By the gap between these axially interior side bodies and the axial outside housing, but form relative shifting range.

On the other hand, as shown in Figure 6, under standard state, the outer circumferential face of the retainer b7 that accommodates ball b6 and outside be embedded between the inner peripheral surface of the retainer guiding element b8 on the seat ring, on the whole circumference that with ball b6 is the center, have the gap of distance b R width.Scope by this gap is determined the mobile range as the ball b6 of rolling element.That is, in the present embodiment, the internal diameter of the external diameter of the diameter of inner race b5 and outer race b4, ball b6 and retainer b7, retainer guiding element b8 etc. becomes the key element of determining as the mobile range of each ball b6 of rolling element.

In the present embodiment, above-mentioned distance b R is half of above-mentioned distance b L.That is, following formula is set up.

bL＝2(bR)

This is to be half formula of the relative movement distance of seat ring corresponding to the displacement distance that makes ball.Like this, in the present embodiment, cut apart each mobile range of each the ball b6 on interior outer race b4, the b5 of setting, but roughly corresponding to by axial outside housing b2 with the above-mentioned relative shifting range that the gap between the side body b3 produces axially.Its result, but the eccentric scope of bearing 1 is consistent with the relative shifting range that is produced by the gap between axial outside housing b2 and the axially interior side body b3.As if constituting like this, eliminate if then make axial outside housing b2 and axially interior side body b3 relatively move to clearance distance bL, then each ball b6 moves up to clearance distance bR and eliminates.Therefore, axially there is not unnecessary gap between the outer circumferential face b2c of outside housing b2 and the axially interior side body b3, and, be used for also not having unnecessary gap between interior outer race b4, the b5 that ball b6 moves.Its result can make bearing b1 miniaturization.

And, in the present embodiment because distance b L and distance b M are roughly the same, so in certain footpath upwards, if in making axially side body b3 and axially outside housing b2 relatively move and eliminate up to distance b L, then this distance b M that directly makes progress also eliminates.Under the bigger situation of the difference of clearance distance bL and clearance distance bM, the eccentric scope of bearing b1 is by the restriction of the side's that wherein clearance distance is little gap, but, then not only can make bearing b1 miniaturization but also can make the eccentric scope of bearing b1 form maximum or to greatest extent by making both roughly the same.And, because can decreased distance bM, therefore can increase circular axially in the internal diameter of side body b3, can make the further lightweight of bearing b1.

In addition, in the present embodiment, do not exist the position of inner race b5 to be provided with circular through hole b9 among the axially interior side body b3.By such through hole b9 is set, can makes axially interior side body b3 lightweight more, and can make bearing b1 lightweight more.And, in the present embodiment, go up (with reference to Fig. 7), make PCD identical because outer race b4, b5 in all are arranged on same circumference b15, and distribute equably at Zhou Fangxiang, so corresponding therewith, through hole b9 is also cut apart setting equably on same circumference and on Zhou Fangxiang.And all through hole b9 are same diameter.If constitute like this, then owing to through hole b9 being arranged on equably Zhou Fangxiang and footpath upwards on the position that does not have inner race b5, therefore, the rigidity that both can make axially interior side body b3 can realize lightweight again in the Zhou Fangxiang equalization.

In the present embodiment, be used for not making the eccentric scope of bearing b1 narrow for the baffle plate b10 of ring-type plectane roughly.That is, as shown in Figure 6, with the radial distance bT till the step difference b12, bigger than above-mentioned distance b L from the inner peripheral surface of baffle plate b10 near the baffle plate the radially inner side that is set at axial outside housing b2.If constitute like this, then the eccentric scope of bearing b1 will not limited by baffle plate b10.In addition, baffle plate forms the degree of depth roughly the same with the thickness of baffle plate b10 with step difference b12, does not make the axial thickness of bearing b1 excessive.

For ball b6 is arranged on position shown in Figure 6, promptly, on the central position of interior outer race b4, b5 under standard state, utilize preload additional with screw etc. preload is applied to axial outside housing b2 and axially under the state between the side body b3, can make bearing b1 along the whole eccentric scope boundary that relatively moves.If constitute like this, then Cuo Wei ball b6 carries out the sliding position adjustment by retainer guiding element b8.Then, utilize the moment of regulation that additional the binding with screw of preload got final product.In the present invention 2, the rolling element of the ball b6 on each position location etc. does not preferably change each PCD (pitch diameter), and is positioned at the center of inside and outside seat ring b4, b5 under standard state.But, because axial load etc. causes the inclined to one side load of effect on rolling element, so might cause specific ball b6 to misplace owing to a part of rolling element floats etc. from seat ring.Even in this case, by retainer guiding element b8 is set, under the state of as mentioned above bearing b1 being assembled, the position that can correct each ball b6.And, preferably additional with applying preload between the inside exterior parts such as screw for the PCD of each the ball b6 under the state of maintaining the standard by preload, suppress as each ball b6 of rolling element and the slip between interior outer race b4, the b5.

In the present invention 2, retainer b7 and retainer guiding element b8 are not essential, still, as present embodiment, if use the retainer b7 accommodate each ball b6, then can suppress the outflow of the oiling agent of the lubricant oil of rolling element periphery or lubricating grease etc.As mentioned above, can easily carry out the position adjustment of ball b6, and by retainer b7 is set, this position adjustment is then more reliable by retainer guiding element b8.That is, outer circumferential face by making retainer b7 and the inner peripheral surface butt of retainer guiding element b8 carrying out the position when adjusting, can positively make ball b6 slide.And, can suppress foreign matter by retainer guiding element b8 and invade between relative seat ring b4, the b5.

In the present invention 2,,, be desirable then forming aspect the little bearing of the comprehensive rolling resistance of plane of trajectory orbital if all rolling elements are all formed ball b6 though the shape of rolling element without limits.And, the quantity of rolling element is not particularly limited, a plurality of rolling elements can be set on outer race b4, the b5 in every group, also can a rolling element be set on outer race b4, the b5 in every group as present embodiment.A rolling element is set on outer race b4, the b5 in every group at least.

In the present invention 2, each axially outside housing b2 and axially on side body b3 and each opposing side two outside housings (housing axially), interior outer race b4, b5 respectively along Zhou Fangxiang be segmented in three places or more than three places the part be provided with.Therefore, the positive and negative of side body b3 in axially, not that the inner race b5 that will be arranged on the same position makes positive and negative one, but as present embodiment, in axially, on the face relative of side body b3 independently inner race b5 is set respectively with two outside housings, under these circumstances, inner race b5 needs more than 6 altogether.Because the rolling element of ball b6 etc. is sandwiched in these interior outer race b4, b5 respectively each other, therefore axially therefore side body b3 and axial outside housing b2 supported more than 3 or 3 along Zhou Fangxiang respectively in can stably support the axial load and the moment load of twocouese.

In the present embodiment, though each interior outer race b4, b5 and each ball b6 are dispersed in whole Zhou Fangxiang, the present invention 2 is not limited to such structure.But, if each axially outside housing b2, b2 inner side surface with axially on the face relative of side body b3 with two outside housings, interior outer race b4, b5 are being disperseed to be arranged on three places or more than three places, then can more stably to support axial load and moment load on the Zhou Fangxiang in than the big Zhou Fangxiang scope of 180 degree (semicircle).Especially when supporting big moment load, such mode of execution is best.

In the present embodiment, outer race b4, b5 in though each six place of side body b3 are provided with at axial outside housing b2 with axially, but especially as present embodiment, with all interior outer race b4, b5 with same PCD (on the same circumference in the face shown in Figure 7) and be distributed in equably under the situation on the Zhou Fangxiang, be preferably in each axially in side body b3 and axially on the housing b2 of the outside, be divided into interior outer race b4, b5 about 3～8 and be provided with partly.Under the situation below two, back shaft housing b2 laterally stably, and cross the size that not only can dwindle each seat ring at most, make the mobile range of rolling element too small, and number of spare parts will increase and structure is tending towards complicated, cause the cost increase.

In the present embodiment, making distance b L is the twice of distance b R, and make distance b M also be the roughly twice of distance b R, even but be not under the situation of twice of distance b R at distance b M, in case making distance b L is the roughly twice of distance b R, then also can make the mobile range of each ball b6 roughly corresponding, and can make that the size of outer race b4, b5 is an inferior limit in each with the eccentric scope of bearing b1.And can make the external diameter of axially interior side body b3 is inferior limit.

In the present embodiment, as shown in Figure 6, be arranged on axially in the positive and negative of inner race b5, b5 side body b3 in axially on the face relative of side body b3 with two outside housings, be configured to form same position (same phase place).Its result, be arranged on relative with these inner races b5, b5 two axially the outer race b4 on outside housing b2, the b2 be unified in structure on the same position (same phase place) also forming under the standard state with these inner races b5, b5.The present invention 2 is not limited to such structure, and the position of inner race b5 (phase place) positive and negative of side body b3 also can difference in axially.

Bearing b1 is under the situation that is installed in the bearing b1 enterprising enforcement usefulness of other external meanss in addition as build-up member, has following method, promptly, on this external means, utilize the reaction force of for example rubber or spring etc., the relative shifting range of restriction bearing b1, if confined thus scope is less than the eccentric scope of bearing b1, then bearing b1 does not interfere between each structure member mutually.

In addition, the axial outside housing of the present invention 2 bearing and axially in side body be not limited to circle (circular), but also polygon for example.Under polygonal situation, in this specification said radially with Zhou Fangxiang be meant on this polygonal circumcircle radially and Zhou Fangxiang.

As mentioned above,, can dwindle the seat ring part, the maximization and the light-weighted multiple row eccentric thrust bearing that carry out bearing easily can be provided by the present invention 2.

Below, with reference to accompanying drawing, just the present invention 3 mode of execution describes.

Fig. 8 is the exploded perspective view of eccentric thrust bearing of first mode of execution of expression invention 3, and Fig. 9 is the sectional view (having omitted from the expression of the lower half portion in axle center) of this bearing.As Fig. 8 and shown in Figure 9, this bearing c1 has two circular axial outside parts c2, c2 and circular axial inner part c3, described axial outside parts c2, c2 axially mutually relatively and on its radial outside peripheral portion by outside screw c11 (with reference to Fig. 9.In Fig. 8, omit) engaged by one, described circular axial inner part c3 is installed in these two axial outside parts each other.In addition, Fig. 9 is as the ball c8 of the rolling element figure of (being called standard state later on) under any neutral condition that does not radially move.

These two axially outside parts c2, c2 have circular axial outside housing c4 respectively and are installed in this axially tabular outer race c5 of annulus on outside housing c4 inner face.Axially outside housing c4 and outer race c5 are independent parts, and the tabular outer race c5 of annulus is installed on the recess c4a on the opposing side side that is arranged on axial outside housing c4.(with reference to Fig. 9).And two axially outside housing c4, c4 are engaged (with reference to Fig. 9 by one by outside screw c11 near the peripheral portion of its radial outside.In Fig. 8, omitted expression).Axially inner part c3 have two circular axially in side body c6, c6 and by inboard screw c12 (with reference to Fig. 9.In Fig. 8, omit diagram) from positive and negative both sides clamp, be fixed on these two axially in the tabular inner race c7 of annulus on side body c6, the c6.Side body c6, c6 and inner race c7 are respectively independently axially, and inner race c7 is by two axially interior side body c6, c6 clamping, and the three is engaged (with reference to Fig. 9 by one by inboard screw c12.In Fig. 8, omit diagram).As shown in Figure 9, the axial centre of inner race c7 is consistent with the axial centre of bearing c1, and forming by this center, with respect to square with the axis plane is the bearing c1 of monosymmetric structure.

In the bearing c1 of this first mode of execution, axially interior side body c6 and rolling element guide portion c9 become one.That is, the rolling element guide portion c9 of flange-shape extends towards radial outside from the outer circumferential face side of circular axially interior side body c6.On this circular rolling element guide portion c9, restriction is as the through hole of the circle of the mobile range of each ball c8 of rolling element, that is, movable range limiting holes c9a equally spaced is provided with on Zhou Fangxiang.Bore dia and (under the standard state) radial position of all movable range limiting holes c9a are identical.Ball c8 is that the corresponding movable range limiting holes c9a ground of a ball is provided with, and under standard state, each ball c8 is positioned at the center (with reference to Fig. 9) of movable range limiting holes c9a.In addition, owing to be provided with axial clearance cX between the plane of trajectory orbital of the axial outer side surface of rolling element guide portion c9 and outer race c5, therefore, even bearing c1 relatively moves, rolling element guide portion c9 also can contact with outer race c5 or mutual slip.

The axial two sides of above-mentioned inner race c7 all is a plane of trajectory orbital, forms the eccentric thrust bearing of the multiple row structure between two sides that a plurality of ball c8 as rolling element are sandwiched in this inner race c7 and relative two outer race c5, the c5.32 of the every row of ball c8 use 64 altogether, and these balls c8 is arranged on the Zhou Fangxiang to approximate equality respectively at each row.Like this,, can stably support axial load and moment load by will roughly equally spaced being arranged on the Zhou Fangxiang as a plurality of ball c8 of the strong point of bearing c1, and, can make the load homogenization that is applied on each ball c8.

Axial outermost at bearing c1 is provided with thin annulus tabular baffle plate c13, c13.As shown in Figure 9, in being fixed on axially, these baffle plates c13, c13 on the axial outboard end of side body c6, extend towards radial outside from this axial outer side surface along axial outside housing c4.This baffle plate c13, c13 since with the axial outer side surface of axial outside housing c4 via small overlapping with gap setting, therefore, when can suppressing foreign matter and in bearing c1, invading, also has the seal action that the oiling agent of the lubricant oil that prevents in the bearing c1 or lubricating grease etc. spills to the outside.In addition, in order further to improve sealing effect, can increase the seal ring in the stuffing box bearing c1.

Remove the ball c8 as rolling element, the radial width of all parts of bearing c1 is certain circular on whole circumference, and, under standard state, all be provided with one heart.Therefore, under standard state, as the rolling element guide portion outer circumferential face c15 of the axial radially outermost face of inner part c3 with axially outside between parts c2, the c2, diametrically, have the gap of distance c M along the whole circumference of Zhou Fangxiang.And equally under standard state, at the radially inner terminal face c17 of axially inner part c2, c2 and axial inner part c3 (in the present embodiment, with axially among the baffle plate c13 that engages of side body c6, the relative opposing side c16 of radially inner terminal face c17 with axial inner part c2, c2) between, diametrically, have the gap of distance c L along the whole circumference of Zhou Fangxiang.Like this, because bearing c1 has impartial gap on the whole circumference of whole Zhou Fangxiang, therefore can carry out relatively moving of certain distance with respect to Zhou Fangxiang is comprehensive.By these axially outside parts c2 and the axially radial clearance between the inner part c3, can determine relatively-movable scope between the two.

On the other hand, outer race c5, c5 are the parts of Circular Plate shape with radial width of regulation, and this radial width is identical on whole circumference.Like this, outer race c5, c5 radially have width, and inner race c7 has radial width greater than the radial width of this outer race c5, c5, relative with outer race c5, c5.Because the bore dia of each movable range limiting holes c9a of rolling element guide portion c9 is bigger than the diameter that is housed in each the ball c8 in each movable range limiting holes c9a, therefore, around ball c8, exist to make movably gap of ball c8.On the other hand, even can not come off from interior outer race c5, c7 for ball c8 is moved in whole movable range limiting holes c9a yet, interior outer race c5, c7 in whole movable range limiting holes c9a zone roughly relatively.Therefore, each ball c8 in the scope that movable range limiting holes c9a is limited can to radially and Zhou Fangxiang move.That is, in this bearing c1, ball c8 can roll up to the inner peripheral surface butt of movable range limiting holes c9a.Under standard state,, therefore between the inner peripheral surface of ball c8 and movable range limiting holes c9a, on the entire circumference that with ball c8 is the center, there is the gap (with reference to Fig. 9) of the width of distance c R because ball c8 is positioned at the center of movable range limiting holes c9a.Therefore, any direction displacement distance cR that ball c8 can be in active face.

In this bearing c1, above-mentioned distance c L is the twice of above-mentioned distance c R.Promptly following formula is set up.

cL＝2(cR)

Form like this is that the displacement distance of corresponding ball c8 as rolling element is the relative movement distance of interior outer race c5, c7 half (1/2).And above-mentioned distance c M and above-mentioned distance c L are roughly the same.And distance c M is preferably identical with distance c L.And (cR) gets final product in cL 〉=2.

Like this, in bearing c1, but by axial outside parts c2 and the axial relative shifting range that produces of the radial clearance between the inner part c3, with corresponding by the mobile range of the ball c8 of the bore dia of movable range limiting holes c9a restriction.Promptly, if axial outside parts c2 and axial inner part c3 are relatively moved up to above-mentioned distance c L (the axially radially inner terminal face c17 of outside parts c2, c2 and the axially distance of the radial clearance between the inner part c3) elimination, then on its movement direction, the distance c R that moves exactly around ball c8 eliminates.That is, if but axial outside parts c2 and axial inner part c3 are relatively moved in its whole relative shifting range, then ball c8 will move in its whole mobile range.Therefore, outside axially, there is not unnecessary gap between the radially inner terminal face c17 of parts c2 and the axial inner part c3.Therefore, bearing c1 miniaturization can be made, eccentric scope can be increased again simultaneously.And, can make bearing c1 lightweight and reduce cost.

And in the bearing c1 of this first mode of execution, above-mentioned distance c L and distance c M (the radial clearance distance between rolling element guide portion outer circumferential face c15 and axial outside parts c2, the c2) are roughly the same.That is, distance c M is the roughly twice of distance c R.Like this,, therefore can dwindle the external diameter of axial outside parts c2, can make bearing c1 miniaturization because clearance distance M becomes inferior limit.In addition, under the bigger situation of the difference of distance c L and distance c M, the eccentric scope of bearing c1 is subjected to the restriction in its medium and small side's gap, and by making both roughly the same, then both can make bearing c1 miniaturization, the eccentric scope of bearing c1 is formed to greatest extent.

And, in this bearing c1, by the distance that moves radially as the ball c8 of rolling element of rolling element guide portion c9 restriction, roughly corresponding to the radial width of outer race c5.That is, as shown in Figure 9, the bore dia of the radial width of outer race c5 and movable range limiting holes c9a (more particularly is slightly less than the bore dia of movable range limiting holes c9a) about equally.Therefore,, outer race c5 is come off, on the other hand, can not make the radial width of outer race c5 excessive yet even ball c8 contacts up to the inner peripheral surface with movable range limiting holes c9a to radially moving.

And though the radial width of inner race c7 is bigger than the bore dia of movable range limiting holes c9a, this is in order to ensure the fixing clamping surplus of inner race c7, rather than makes it excessive.Promptly, with regard to inner race c7, because inner race c7 is by being fixed by two axially interior side body c6, c6 clampings, so in order to ensure clamping surplus, its radial width is greater than the bore dia of movable range limiting holes c9a, but the radial position of the outer circumferential face of inner race c7 is identical with the radial position of the outer circumferential face of outer race c5.

Like this, because the radial width of outer race c5 and moving radially as the ball c8 of rolling element apart from roughly corresponding, and, the radial width of inner race c7 except above-mentioned clamping surplus also with ball c8 move radially the distance roughly corresponding, therefore, the radial width of interior outer race c5, c7 forms inferior limit.Interior outer race c5, c7 are by the ferrous metal manufacturing of bearing steel etc., and axially outside housing c4 and axially in side body c6 can be with the light metal manufacturing of aluminum alloy etc., therefore, by outer race c5, c7 in dwindling, can make bearing c1 lightweight and reduce cost.

Under the situation that bearing c1 moves, between interior outer race c5, c7 and rolling element guide portion c9, do not produce slip in the circular scope that is limited by the movable range limiting holes c9a of rolling element guide portion c9.This is because rolling element guide portion c9 is fixed on axial inner part c3 goes up, becomes one with inner race c7, and owing to does not contact by between above-mentioned gap cX (with reference to Fig. 2) rolling element guide portion c9 and the outer race c5.Resistance when therefore, bearing c1 relatively moves becomes very little.

Rolling element guide portion c9 is circular, and, being arranged on the movable range limiting holes c9a on this rolling element guide portion c9, on the same circumference and the position of Zhou Fangxiang equalization is provided with 32.Owing in each movable range limiting holes c9a, be provided with ball c8 as rolling element, thus the strong point of bearing c1 radially with the Zhou Fangxiang equalization, can more stably support axial load and moment load.And owing on a movable range limiting holes c9a rolling element is set, therefore, ball c8 each other can contact friction, can dwindle the resistance when relatively moving.In addition, the quantity of movable range limiting holes c9a can be under the adjacent discontiguous condition of movable range limiting holes c9a, increased, the quantity of ball c8, the load capacity of raising bearing c1 can be increased.

In the present embodiment, as shown in Figure 9, be arranged on the two sides of inner race c7 two axially in side body c6, c6, positive and negative at inner race c7 is identical phase place, therefore, under standard state, the position that is provided with of movable range limiting holes c9a and ball c8 also is a same phase on the two sides of inner race c7.The present invention 3 is not limited to such structure, and the phase place of movable range limiting holes c9a and ball c8 also can be different at the positive and negative of inner race c7.

In addition, baffle plate c13, c13 are designed to not the eccentric scope of bearing c1 is limited.Promptly, as shown in Figure 9, under standard state, begin to the outside that is set at axial outside housing c4 and have baffle plate with the roughly the same degree of depth of face thickness of baffle plate c13, the c13 radial distance cS till with step difference c14 from the radial outside end of baffle plate c13, c13, longer slightly than distance c L.In addition, under standard state, baffle plate c13, c13 are also long slightly than distance c L with the radial length cT of the outside intersection of axial outside housing c4, and the inside of bearing c1 is hidden on the eccentric scope of whole bearing c1.

For each ball c8 is arranged on position shown in Figure 9, be on the central position of the movable range limiting holes c9a under the standard state, utilizing under the additional state that with screw etc. light preload is applied between the inside and outside parts of preload, make bearing c1 carry out maximum relatively moving and get final product along whole radially (whole circumference).If like this, then under standard state, the ball c8 from the off(-)center of movable range limiting holes c9a is crushed on the inner peripheral surface of movable range limiting holes c9a and slides, carry out the position adjustment on interior outer race c5, c7.When using bearing c1, get final product with screw then with the moment connection preload of regulation is additional.In addition, if the height (axial thickness) of the inner peripheral surface of the movable range limiting holes c9a of rolling element guide portion c9 is more than or equal to the radius (ball diameter/2) of ball c8, when then ball c8 is crushed on the inner peripheral surface of movable range limiting holes c9a, the summit of ball c8 and this inner peripheral surface butt, can stably carry out the position adjustment of ball c8, therefore very desirable.

Like this, rolling element guide portion c9 is not the mobile range that merely limits ball c8, but function as follows, promptly, can be really and simply ball c8 is arranged on the central position (standard state) of movable range limiting holes c9a, from the gap that certain distance cR is guaranteed in this central position, ball c8 can be moved in this scope.In addition, in the bearing c1 of this first mode of execution, because partially load acts on the ball c8, so ball c8 might float etc. from interior outer race c5, c7, and might stagger from the central position of movable range limiting holes c9a under standard state in the position of ball c8.Even in this case, as mentioned above, by under light preload effect, carrying out maximum relatively moving, can be under the state after bearing c1 is assembled and the position of correcting ball c8 very easily.And, for the dislocation that suppresses ball c8, the PCD (pitch diameter) that keeps each ball c8, can utilize that preload is additional to be applied to preload between the inside and outside parts with screw etc., suppress slip between each ball c8 and interior outer race c5, the c7 with this.

Material to this bearing c1 is not particularly limited.Just from making the light-weighted viewpoint of bearing c1, preferably axially outside housing c4 and axially in side body c6 with the light metal or the resin of aluminum alloy etc., inner race c7 and outer race c5 use the ferrous metal of bearing steel etc.By like this, in axial outside parts c2 and axial inner part c3, only make the high bearing steel of interior outer race c5, c7 use hardness that forms contact with ball c8, and make axial outside housing c4 and axially in side body c6 use the light metal etc. of aluminum alloy etc., can make bearing c1 lightweight with this.In addition, the retainer c9 of annular is by manufacturings such as resins usually, and ball c8 is by manufacturings such as bearing steels.Baffle plate c13 can be with manufacturings such as stainless steel or resins.

Figure 10 is the sectional view (having omitted the lower half portion from the axle center) of bearing c20 of second mode of execution of expression invention 3.In this bearing c20, different with the bearing c1 of first mode of execution, parts c2 is formed all the other a part of annular outboard housing c22 formations of outside one component c 21, c21 and the axial outside of the conduct housing c4 of one outside axial by an outer race c5 and the part of axial outside housing c4.Roughly two of Circular Plate shape outside one component c 21, c21, are connected by outside screw c11 one by annular outboard housing c22 radially near the outer most edge portion at it.If constitute like this, then number of spare parts will reduce, and be very good aspect the axial thickness that forms thin bearing c20 easily.But, making under the situation of outer race with bearing steel etc., because with manufacturing outer race such as bearing steel and the whole outside one component c 21 that becomes one with the part of axial outside housing, so be disadvantageous from light-weighted viewpoint.That is,, as the bearing c1 of first mode of execution, preferably make axial outside housing c4 and outer race c5 separately from light-weighted viewpoint.

In addition, in this bearing c20, as the bearing c1 of first mode of execution, the rolling element guide portion is not an one with axially interior side body c6, and rolling element guide portion c23 is separately, separates.This rolling element guide portion c23 is that resin is made, and two rolling element guide portion c23, c23 are set on the two sides of inner race c7.This rolling element guide portion c23 and the rolling element guide portion c9 of first mode of execution are identical circular, on same circumference and in a circumferential direction, a plurality of movable range limiting holes c23a are set on the impartial position.The bore dia of the movable range limiting holes c23 that these are all is identical.This rolling element guide portion c23, the c23 fixing device by screw etc. be fixed on inner race c7 or axially on the axial inner part c3 of side body c6 etc.Therefore, this independent rolling element guide portion c23 is identical with the rolling element guide portion c9 of first mode of execution, and the mobile range of ball c8 is limited in the circular scope of predetermined radius.By making rolling element guide portion c23 separately like this, can form the rolling element guide portion with other materials such as resins, help to reduce cost and lightweight.

Figure 11 is the sectional view (having omitted the lower half portion from the axle center) of bearing c30 of the 3rd mode of execution of expression invention 3.This bearing c30 is identical with the bearing c20 of second mode of execution, in axial outside parts c2, outer race c5 and axial outside housing c4 form one, but c20 is different with bearing, and the part with the annular outboard housing c22 in second mode of execution also forms outside one component c 31, the c31 of one.And, in this bearing c30, use inner race c7 and axially interior side body c6, c6 to form the inboard one component c 32 of one.Therefore, than the number of spare parts of the bearing c20 in second mode of execution still less, can form aspect the axial thickness of bearing better than unfertile land.But, as mentioned above, be disadvantageous from the lightweight aspect.That is, be more preferably as the bearing c1 of first mode of execution, inner race c7 separated with axially interior side body c6, and axial outside housing c4 is separated with outer race c5 from the lightweight aspect.

In this bearing c30, the rolling element guide portion c33 of resin manufacture also has the baffle plate effect.That is, make the plane of trajectory orbital of the axial outer side surface of rolling element guide portion c33, make axial clearance cY (with reference to Figure 11) between the two form micro-gap near outer side surface one component c 31.And outside one component c 31 has step difference c34 on the part that more is positioned at radially inner side than the plane of trajectory orbital that ball c8 rolled, and more is positioned at this this step difference c34 on the part of radially inner side to have the c35 of annular thin wall portion.Because the axial clearance cY between this c35 of annular thin wall portion and the above-mentioned rolling element guide portion c33 is very little, therefore has the baffle plate effect.By forming such structure, need not other baffle plate c13 is set as the bearing c1 of first mode of execution, so number of spare parts further reduces.And, form the thin c35 of annular thin wall portion by making the part that plays baffle effect in the outside one component c 31, can make bearing c30 lightweight.

In this bearing c30, also identical two rolling element guide portion c33, c33 are set with bearing c20, these rolling element guide portion c33, c33 are that resin is made, is arranged with inboard one component c 32 five equilibriums, together fix with inboard one component c 32 by proper device such as screws.Rolling element guide portion c33, c33 are identical circular of the rolling element guide portion c9 with first mode of execution, and on same circumference and on Zhou Fangxiang, a plurality of movable range limiting holes c33a are set on the impartial position.The bore dia of the movable range limiting holes c33a that these are all is all identical.Therefore, independently rolling element guide portion c33, c33 are identical with the rolling element guide portion c9 of first mode of execution for this, and the mobile range of ball c8 is limited in the circular scope of predetermined radius.In addition, on this bearing c30, it is additional with screw etc. that preload for example also can be set in addition, and two outside one component c 31, c31 are not separated.

Bearing in the present invention 3 is installed in as build-up member under the situation of the bearing enterprising enforcement usefulness of other external components in addition, has following method, promptly on this external component, utilize for example reaction force restriction moving range of rubber or spring etc., if the scope of restriction is less than the eccentric scope of bearing thus, then bearing is not interfered between each parts.

In addition, though in the above-described embodiment, with axial outside parts c2 be arranged on radial outside, radially inner side that axial inner part c3 is arranged on axial outside parts c2 is that example describes, but opposite also can be axially outside parts c2 be arranged on radially inner side, axial inner part c3 is arranged on the radial outside of axial outside parts c2.In this case, axially the circular inner race c7 of inner part c3 is provided with to radially inner side highlightedly from axially interior side body c6.And, in the above-described embodiment,, also can be fixed on the axial outside parts c2 though be that example describes rolling element guide portion c9 is fixed on axial inner part c3 goes up.

As mentioned above, can provide a kind of very little multiple row eccentric thrust bearing of loss can carry out the relatively moving and relatively move of certain distance the time by inventing 3.

Below, with reference to the accompanying drawings, describe with regard to inventing 4 mode of execution.

Figure 12 is the exploded perspective view of eccentric thrust bearing of first mode of execution of expression invention 4, and Figure 13 is the sectional view (omitting lower half portion that rise in the axle center) of this bearing.As Figure 12 and shown in Figure 13, this bearing 1 has mutually relatively and one engages two circular axial outside parts 2,2 and between these two axial outside parts circular axial inner part 3 each other.In addition, the figure of Figure 13 neutral condition (being called standard state later on) that to be expression do not move to radially any direction as the ball 8 of rolling element.

These two axially outside parts 2,2 respectively by circular axial outside housing 4 and be installed in this axially the tabular outer race 5 of annulus of the opposing side side of outside housing 4 constitute.Axially outside housing 4 is to separate independently parts with outer race 5, and outer race 5 is installed on the recess 4a (with reference to Figure 13) on the opposing side side that is arranged on axial outside housing 4.And two axial outside housings 4,4 are engaged (with reference to Figure 13 by outside screw 11 one near the peripheral portion of its radial outside.In Figure 12, omitted expression).Axially inner part 3 have two circular axially in side bodies 6,6 and from these two axially in the tabular inner race 7 of annulus that extends to radial outside of side bodies 6,6 outstandingly, flange shape.Side body 6,6 separates respectively with inner race 7 axially, and inner race 7 is by two axially interior side body 6,6 clampings, and the three engages (with reference to Figure 13 by inboard screw 12 one.In Figure 12, omitted expression).As shown in figure 13, the axial centre of inner race 7 is consistent with the axial centre of bearing 1, forms by this center and has the bearing 1 of symplex structure with respect to square with the axis plane.

The two sides of above-mentioned seat ring 7 all is a plane of trajectory orbital, is clamped in as the ball 8 of a plurality of rolling elements between the two sides and two outer races 5,5 relative with it of this inner race 7.Therefore, this bearing 1 bearing that is the multiple row structure.Ball 8 is whenever shown 24, uses 48 altogether, and these balls 8 are arranged on the Zhou Fangxiang to approximate equality respectively in each row.And, one of every row, totally two annular retainers 9,9 are set, ball 8 is housed among the aperture 9a that roughly equally spaced is arranged on this annular retainer 9 freely by rolling respectively.By this annular retainer 9, each ball 8 keeps roughly equally spaced position relation mutually on Zhou Fangxiang.Like this, by will roughly equally spaced being arranged on the Zhou Fangxiang, can stably support axial load and moment load as a plurality of balls 8 of the strong point of bearing 1.In addition, the number needs of ball 8 is wanted three of at least one row, can suitably set according to load capacity or bearing size.

Therefore interior outer race 5,7, forms continuous plane of trajectory orbital at Zhou Fangxiang owing to be circular parts all.Therefore, ball 8 can revolve round the sun.That is, this bearing 1 can axial outside parts 2 and axially between the inner part 3 freedom mutually to rotating.In addition, annular retainer 9 can be synchronized with the movement with ball 8.

The axial outermost of bearing 1 is provided with the tabular baffle plate of thin annulus 13,13.As shown in figure 13, in being fixed on axially, on the axial outboard end of side body 6, extend towards radial outside on these baffle plates 13,13 from this axial outer side surface along axial outside housing 4.Because 13,13 on this baffle plate is by therefore overlapping setting has and suppressing to prevent the sealing function that the oiling agent (lubricant oil or lubricating grease etc.) in the bearing 1 spills to the outside when foreign matter is invaded in bearing 1 with the small gap of the axial outer side surface of axial outside housing 4.In addition, in bearing 1, invade grade, improve sealing function, also can further increase the sealing gasket in the stuffing box bearing 1 for fear of moisture.

Except the ball 8 as rolling element, the radial width of all parts of bearing 1 all is certain circular on whole circumference, and, under standard state, all be provided with one heart.Therefore, under standard state, the radially outermost face 15 of axial inner part 3 with axially outside between the parts 2,2, diametrically, be present on the full week of Zhou Fangxiang apart from the gap of M.And under standard state, between the radially inner terminal face 16 of parts 2,2 and the axial inner part 3, diametrically, the gap of distance L was present on the full week of Zhou Fangxiang outside axially equally.Like this, because bearing 1 has impartial gap on the full week of Zhou Fangxiang, therefore, with respect to the comprehensive off-centre that can form certain distance of Zhou Fangxiang.By these axially outside parts 2 and the axially radial clearance between the inner part 3, can determine relatively-movable scope between the two.

On the other hand, outer race the 5, the 5th, the tabular parts of annulus with radial width of regulation, this radial width is identical on whole circumference.Like this, outer race 5,5 radially has width, and since axially side body 6 have more than or equal to the radial width of the radial width of this outer race 5,5 and relative with outer race 5,5, so ball 8 has the leeway of moving diametrically.On this bearing 1, owing to ball 8 is housed in the annular retainer 9, so ball 8 can be to the inner peripheral surface or outer circumferential face and the axially inner part 3 or axially outside parts 2 butts that radially move up to this annular retainer 9.In this bearing 1, under standard state, at the outer circumferential face of annular retainer 9 and axially between the parts 2 of the outside, the gap of distance R was present on the full week of Zhou Fangxiang diametrically, and at the inner peripheral surface of annular retainer 9 and axially between the inner part 3, diametrically, the gap of distance R is present in the full week last (with reference to Figure 13) of Zhou Fangxiang equally.By this clearance distance R, ball 8 and annular retainer 9 can move with the width of distance R on radially comprehensive.

In this bearing 1, above-mentioned distance L is the twice of above-mentioned distance R.That is, following formula is set up.

L＝2R

Form like this is that the displacement distance of corresponding ball 8 as rolling element is the relative movement distance of interior outer race 5,7 half (1/2).And, above-mentioned preferably roughly the same apart from M and above-mentioned distance L, and identical better.And L 〉=2R gets final product.

Like this, in bearing 1, but by axial outside parts 2 and axially the relative shifting range that produces of the radial clearance between the inner part 3 roughly corresponding to radially movable distance as the ball 8 of rolling element.Promptly, if make both off-centre up to axial outside parts 2 and axially the radial clearance distance L of inner part 3 (axially the radially inner terminal face 16 of outside parts 2,2 with axially the distance of the radial clearance between the inner part 3) eliminate, then move above-mentioned clearance distance R elimination on its eccentric direction as the ball 8 of rolling element.Therefore, outside axially, there is not unnecessary gap between the radially inner terminal face 16 of parts 2,2 and the axial inner part 3, and, be used to make ball 8 between the interior outer race 5,7 that radially moves, also not have unnecessary gap.Its result both can make bearing 1 miniaturization, also can enlarge its eccentric scope.

Be formed inferior limit being used to make ball 8 between the interior outer race 5,7 that radially moves, not have unnecessary gap also to be meant as the outer race 5 of the key element of decision clearance distance R and the radial width of inner race 7.Therefore, interior outer race 5,7 dwindles, and can realize the miniaturization and the lightweight of bearing 1, and can reduce cost.In addition, though the radial width of inner race 7 is wideer than the radial width of outer race 5, but this is owing to being provided with by the clamping surplus of axially interior side body 6,6 clampings with axially interior side body 6,6 in order to engage inner race 7, is not the radial width that megarelief becomes inner race 7.

And, in the bearing 1 of this first mode of execution, make distance L and roughly the same apart from M (the axially radially outermost face 15 of inner part 3 and axially the radial clearance distance between the parts 2,2 of the outside).That is, apart from M be the roughly twice of distance R (as the movable distance of the ball 8 of rolling element).Therefore, axially the radial clearance between the radially outermost face 15 of inner part 3 and the axial outside parts 2,2 also forms inferior limit.Therefore, the external diameter of axial outside parts 2 can be dwindled, bearing 1 miniaturization can be made.

Because distance L is with roughly the same apart from M,,, then directly upwards also will roughly eliminate apart from M at this up in some directly upwards distance L elimination if it is promptly eccentric that axial inner part 3 and axial outside parts 2 are relatively moved.Under the bigger situation of the difference of clearance distance L and clearance distance M, the eccentric scope of bearing 1 will be subjected to the restriction in the little side's of its middle distance gap, but by making both roughly the same, then both can make bearing 1 miniaturization, the eccentric scope of bearing 1 is formed to greatest extent.

In addition, baffle plate 13,13 is designed to not the eccentric scope of bearing 1 is limited.Promptly, as shown in figure 13, under standard state, play on the outside that is set at axial outside housing 4 and have baffle plate with the roughly the same degree of depth of face thickness of baffle plate 13, the 13 radial distance S till with step difference 14 from the radial outside end of baffle plate 13,13 and be longer than distance L a little.In addition, under standard state, baffle plate 13,13 is also more longer than distance L with the radial length T of the outside superposed part of axial outside housing 4, and the inside of bearing 1 is hidden in the eccentric scope of whole bearing 1.

For each ball 8 and annular retainer 9 are arranged on position shown in Figure 13, promptly, on the central position radially of the outer race 5 under the standard state, utilizing under the additional state that with screw etc. light preload is applied between the inside and outside parts of preload, but make bearing 1 in whole relative shifting range, the boundary that promptly moves to eccentric scope on whole circumference gets final product.By like this, the outer circumferential face of annular retainer 9 or inner peripheral surface and axially outside parts 2 or axially inner part 3 suitable butts, by make ball 8 and annular retainer 9 on interior outer race 5,7 suitably slip carry out the position adjustment.So that the moment connection preload of regulation additional with screw get final product thereafter.Like this, can ball 8 be arranged on the radial center position of outer race 5 easily by annular retainer 9.

Under load acts on as the situation on the ball 8 of rolling element partially, ball 8 that might a part floats from seat ring and waits, produces and misplace, but by annular retainer 9 is set, the ball 8 of a part will move, and the relative position relation of ball 8 can not upset.On the other hand, the situation that has the position of annular retainer 9 to stagger.That is, because the radial position of annular retainer 9 is not directed, therefore may stagger with the axle center of bearing 1 in the axle center of annular retainer 9 under standard state.In order to suppress such dislocation, to keep the PCD of each ball 8, can inwardly apply preload between the exterior part with screw etc. by preload is additional, suppress as each ball 8 of rolling element and the slip between the interior outer race 5,7 with this.And, under the situation about staggering in the position of annular retainer 9, as mentioned above, can under state, correct the position very easily with bearing 1 assembling.

Material to this bearing 1 is not particularly limited.Just from making bearing 1 light-weighted viewpoint, preferably axially outside housing 4 and axially in side body 6 make by the light metal or the resin of aluminum alloy etc., inner race 7 and outer race 5 use bearing steel or Stainless Steel Alloy, stupaliths etc.By like this, only make axial outside parts 2 and axially the interior outer race 5,7 in the inner part 3 use the material of the bearing steel etc. of hardness height, wear-resistant and fatigue resistance excellence, outer race the 5, the 7th in described is with the contact as the ball 8 of rolling element, and make axial outside housing 4 and axially in side body 6 use the light metal etc. of aluminum alloys etc., can make bearing 1 lightweight with this.In addition, annular retainer 9 is by manufacturings such as resins usually, and ball 8 is by manufacturings such as bearing steels.Baffle plate 13 can be with manufacturings such as stainless steel or resins.

Figure 14 is the sectional view (having omitted lower half portion that rise in the axle center) of bearing 20 of expression the present invention's 4 second mode of execution.In this bearing 20, different with the bearing 1 of first mode of execution, axially inner part 3 forms one.That is, inner race 7 and axially interior side body 6 form one.By like this, number of spare parts reduces, and, be desirable forming aspect the axial thickness of bearing 20 than unfertile land.If but at this moment with formation inner races 7 such as bearing steels, then whole axial inner part 3 becomes bearing steel etc., therefore, is disadvantageous from light-weighted viewpoint.That is,, make inner race 7 and axially interior side body 6 separately from the best bearing 1 of light-weighted viewpoint as first mode of execution.

Figure 15 is the sectional view (having omitted lower half portion that rise in the axle center) of bearing 30 of the 3rd mode of execution of expression invention 4.In this bearing 30, identical with the bearing 20 of second mode of execution, axially inner part 3 forms one, and axially outside parts 2 form one.That is, axially outside housing 4 and outer race 5 are formed one.By like this, number of spare parts further reduces, and, be better forming aspect the axial thickness of bearing than unfertile land.Just as mentioned above, be disadvantageous from light-weighted viewpoint.That is,, inner race 7 and axially interior side body 6 are separated, and axial outside housing 4 and outer race 5 are separated from the best bearing 1 of light-weighted viewpoint as first mode of execution.

In addition, the present invention 4 bearing is being installed in as build-up member under the situation about using on bearing other external meanss in addition, has following method, promptly on this external means, utilize for example extent of the error of reaction force such as rubber or spring restriction bearing, if confined thus scope less than the eccentric scope of bearing, is not then interfered between each component parts of bearing mutually.

In addition, though in the above-described embodiment, with axial outside parts 2 be arranged on radial outside, radially inner side that axial inner part 3 is arranged on axial outside parts 2 is that example is illustrated, but opposite also can be axially outside parts 2 be arranged on radially inner side, axial inner part 3 is arranged on the radial outside of axial outside parts 2.At this moment, axially the circular inner race 7 of inner part 3 side body 6 in axially is provided with highlightedly to radially inner side.

As mentioned above,,, make the gap between each parts more definite, can provide a kind of and can realize miniaturization and light-weighted bearing by eccentric scope with respect to bearing can freedom in relative rotation in the multiple row eccentric thrust bearing according to invention 4.

Claims (5)

1. multiple row eccentric thrust bearing, have two mutually with one heart relatively and circular axial outside parts that engaged by one and be clipped on these two the axially circular axial inner part between the parts of the outside with one heart, above-mentioned two axially outside parts have circular axial outside housing respectively and be installed in this axially tabular outer race of annulus on the inner face of outside housing, above-mentioned axial inner part have circular axially in side body and from this axially in side body radius vector to the outstanding tabular inner race of annulus that extends, simultaneously, a plurality of rolling elements are installed between the two sides and relative above-mentioned two outer races of above-mentioned inner race, it is characterized in that

Have and be fixed on above-mentioned axial inner part or axially be limited in rolling element guide portion in the predetermined range on the parts of the outside and with the mobile range of each rolling element.

2. multiple row eccentric thrust bearing as claimed in claim 1 is characterized in that, the afore mentioned rules scope that above-mentioned rolling element guide portion is limited is the circular scope of predetermined radius.

3. multiple row eccentric thrust bearing as claimed in claim 1 is characterized in that, but the relative shifting range that is produced by the radial clearance between above-mentioned axial outside parts and the above-mentioned axial inner part is roughly corresponding to the above-mentioned mobile range of rolling element.

4. multiple row eccentric thrust bearing as claimed in claim 1, it is characterized in that, above-mentioned rolling element guide portion is circular, and on this rolling element guide portion, in the movable range limiting holes that is provided with on the same circumference and in the position of Zhou Fangxiang equalization more than or equal to three, simultaneously, in these each movable range limiting holes, a rolling element is set.

5. multiple row eccentric thrust bearing as claimed in claim 1.It is characterized in that, by moving radially of the rolling element of above-mentioned rolling element guide portion restriction apart from roughly corresponding with the radial width of above-mentioned inner race or outer race.

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