CN1547795A - Mechanism for canceling mass eccentricity of rotational body, and motor having the same - Google Patents

Abstract

The invention relates to a mass eccentricity canceling mechanism for canceling the mass eccentricity of a rotational body including a rotation subject body such as a disk-like recording medium, capable of completely eliminating the mass eccentricity of the rotational body including a rotation subject body and quickly and smoothly changing the state of mass eccentricity to a cancel state. This mass eccentricity canceling mechanism for canceling the mass eccentricity of a rotational body 5 rotating around the axis of one rotational shaft 4 comprises a plurality of balance rings 9, 10 spaced axially of the rotational shaft 4 and fitted so that they are movable radially of the rotational shaft 4, a plurality of differential rings 11, 12 disposed inside the balance rings 9, 10 and fitted so that they are movable radially of the rotational shaft 4, and axial control members 7, 6, 8 rotating integrally with the rotational shaft 4 and axially contacting the balance rings 9, 10 and differential rings 11, 12 to impart rotation through friction.

Description

Rotary body lay particular stress on the motor that the heart is eliminated mechanism and had this mechanism

Technical field

The present invention relates to eliminate the motor that the heart is eliminated mechanism and had this mechanism of laying particular stress on of laying particular stress on the heart of the rotary body that is installed on the rotating shaft.In more detail, the present invention relates to be applicable to and carry out the motor that the heart is eliminated mechanism and had this mechanism of laying particular stress on that the off-centre vibration of rotary body of the disc of high speed rotating suppresses comprising by CD (CD) and DVD discs such as (Digital video discs) being placed on the CD driving mechanism that is rotated on the rotating disk.

Background technology

Along with popularizing of the disk stores device of CD-ROM and CD-R/W and DVD-ROM etc., need to improve the access speed of disc.Such as, 24 times and 32 times of rotary speed that the rotary speed of disc storage are increased to CD have been done research, but like this, the rotating speed of disc also reaches 5000～6000rpm.In addition, also be necessary the rotating speed of disc is increased to about 10000rpm in the future.

For the heart of laying particular stress on of the rotary body on the motor of eliminating the drive motor that is installed in the CD driving mechanism that comprises high speed rotating like this, developed the various hearts of laying particular stress on and eliminated mechanism.

Such as, as the counterweight of ring-type is eliminated mechanism 100 as the heart of laying particular stress on that gimbal uses, that exploitation has is shown in Figure 31, movably a plurality of gimbal 103,104 folding and unfoldings and the outer wall 102 and the structure between the inwall 105 (with reference to Japanese patent laid-open 11-103557 communique) of the folding and unfolding portion of rotating shaft 101 one rotation.Laying particular stress on the heart at this eliminates in the mechanism 100,2 gimbals 103,104 are configured on the right-angle plane of same axle, by the rotation of rotating shaft 101, with the folding and unfolding portion generation rotation of rotating shaft 101 one, inner gimbal 103,104 contacts with inwall 105 with outer wall 102 respectively, thereby averages out.

In addition, annular counterweight is laid particular stress on other examples that the heart is eliminated mechanism 200 as what gimbal used, that exploitation has is shown in Figure 32, movably gimbal 202 folding and unfoldings with the folding and unfolding portion 201 of rotating shaft one rotation in structure (with reference to Japanese patent laid-open 11-39784 communique).Lay particular stress on the heart at this and eliminate in the mechanism 200, by the rotation of rotating shaft, the 201 one rotation of folding and unfolding portion, inner gimbal 202 contacts with outer wall, thereby averages out.

In addition, also just like proposing following a kind of mechanism as shown in Figure 34: with a plurality of cyclic ligand recasts is gimbal, configuration up and down uninterruptedly mutually, the heart of laying particular stress on that a part directly is enclosed within on the motor rotation axis is contiguously eliminated mechanism's (Japanese patent laid-open 10-243604 number).Eliminate in the mechanism 400 at this, by the rotation of rotating shaft 401, shown in Figure 35 A～Figure 35 C, in case gimbal 402,403 is with rotating shaft 401 rotations, then balance component moves to gimbal 402,403 and rotary body synthetic center of gravity and rotary body consistent location, thereby averages out.

And, eliminate mechanism 300 as the heart of laying particular stress on that has used spherical counterweight, as shown in figure 33, exploitation have with a plurality of ball 303 folding and unfoldings movably with the folding and unfolding portion 302 of rotating shaft 301 one rotation in structure.

But the above-mentioned heart of laying particular stress on is eliminated in the mechanism, and each eliminates all imperfections of function, is difficult to fully eliminate vibration and noise.Thereby cause descend the useful life of bearing of motor, become the obstacle of high speed.And, Motor Control is applied load, the control of starting rotary speed is complicated, can not eliminate and lay particular stress on the heart, have to when disc can't read fixing speed classification decline is dealt with, thereby cost increases.

And, the heart of laying particular stress on shown in Figure 31 is eliminated in the mechanism 100,2 gimbal 103,104 internal diameters are all big, as seen from the figure, the distance of the position of centre of gravity of the rotating shaft 101 of motor and gimbal 103,104 itself is very little, thereby to eliminate the big occasion of lopsidedness, lay particular stress on heart elimination mechanism 100 and itself have to maximize.In addition, gimbal 103,104 is in axial comprehensive engagement with respect to folding and unfolding portion, and because of laying particular stress on the vibration slightly that the heart causes, the contact resistance of gimbal is big, thereby the method that does not move with respect to the motor rotation.That is be incomplete, as the function that lays particular stress on heart elimination mechanism 100.And the heart of laying particular stress on 1 gimbal 202 is shown in figure 32 eliminated in the mechanism 200, because gimbal 202 is 1, when making up with the rotary body that has averaged out, makes gimbal 202 become generation on the contrary and lays particular stress on the reason of the heart.

And, eliminate in the mechanism 300 at the heart of laying particular stress on a plurality of balls 303 shown in Figure 33, find can't eliminate such result in the low-speed region below 3000rpm.In addition, ball 303 all moves easily during starting and when stopping, and produces noise between the folding and unfolding portion 302.And, thereby, cause eliminating unstable properties with the wearing and tearing powder of the internal perisporium of the folding and unfolding portion 302 of ball 303 butts.

Be that laying particular stress in the heart elimination mechanism 400 of rotating shaft inserted in gimbal, perforation with a plurality of cyclic ligand recasts shown in Figure 34, speed reducing ratio (chain rate) with respect to gimbal 402,403 is less, thereby the relative speed difference of gimbal 402,403 and rotary body is very big during whirling (revolution), thereby be difficult to stop, eliminate low precision, maybe can't stop and crossing and eliminate the position, repeatedly to stop at the elimination position and carry out repetition, like this, situation about can't eliminate because of crossing significantly more likely can take place in spended time.And, during with the combination of the rotary body that averaged out, exist gimbal 402,403 image patterns 34 to be separated like that and in the such problem of the method for opposite location.In addition, even suppose successfully to move, from Figure 35 A～Figure 35 C as can be known, the contact-making surface of the packing ring 404 of gimbal 402,403 and supporting is little, it is little consequently to rub, and for following the priming speed spended time of rotating shaft 401, makes that the time till eliminating is also elongated.

In view of this, the objective of the invention is to, provide a kind of and can fully eliminate laying particular stress on the heart and rapidly, successfully entering the motor that the heart is eliminated mechanism and had this mechanism of laying particular stress on of elimination state of rotary body.

Content of the present invention

In order to achieve the above object, the heart of laying particular stress on of laying particular stress on the heart of elimination rotary body of the present invention is eliminated mechanism, comprising: rotating shaft; At least 2 gimbals, it is radially embedding in axial separate configuration and with respect to rotating shaft movably with respect to rotating shaft; At least 1 differential ring, its be configured in gimbal each inboard, radially embedding movably with respect to rotating shaft; The axial restraint member, the rotation of itself and rotating shaft one axially contact with gimbal and differential ring, gives by the transmission that rubs and rotating and to axial mobile the restriction.Here, gimbal by the 1st gimbal and the 2nd gimbal totally 2 constitute, each inboard of the 1st and the 2nd gimbal disposes the 1st and the 2nd differential ring, simultaneously, being configured in 2 and axle meets at right angles and preferably has the axial restraint member respectively outside reaching between the group of the 1st gimbal and the 1st differential ring and the 2nd balance and the 2nd differential ring on the plane.This occasion can be eliminated with minimal space and part number and lay particular stress on the heart.

The heart of laying particular stress at rotary body is eliminated in the mechanism, gimbal in the shimmy revolution action is in case near eliminating the position, then vibration reduces gradually, gimbal contacts with the axial restraint member gradually, the limit increases the ratio of suffered frictional resistance, the limit reduces to carry out the ratio that shimmy revolution is moved because of vibration obtains centrifugal force, finally stops at and eliminates the position, rotates with the rotating shaft constant speed.Just in case the displacement when this is about to stop is excessive, then cross and eliminate the position because of the inertia force of gimbal, in addition, in case the direction that increases towards vibration moves, stop by obtaining frictional resistance, then or like this stay inadequate vibration, or to next time opportunity and time-consuming, maybe can't stop and can't eliminating always.But, by differential ring being clipped between gimbal and the rotating shaft, the speed reducing ratio (chain rate) that gimbal is moved can obtain greatly, can contact with the axial restraint member with the little state of speed difference, stop easily when stopping at the axial restraint member, improve and eliminate precision, can obtain stable performance simultaneously.Between a plurality of gimbals, by the size of differential ring and the amount of moving radially are set aptly according to each gimbal, can carry out the different differential motion of translational speed, that can eliminate rotary body comprehensively lays particular stress on the heart.Especially, a plurality of gimbals are made counterrotating occasion mutually in the opposite direction, can realize stable balance play quickly.And can obtain the balance that lays particular stress on the heart.In addition, by using differential ring, just can obtain the balance that lays particular stress on the heart from the beginning of low speed rotation zone.Thus, can realize stable balance play soon, thereby can obtain the balance that lays particular stress on the heart.And, Miniaturizable in the space of regulation.

In addition, the heart of laying particular stress on of the present invention is eliminated mechanism, preferably has the differential ring restrictions, this differential ring restrictions and the rotation of rotating shaft one, simultaneously by with the outer peripheral face butt of differential ring, in the inner peripheral surface of differential ring and the rotating shaft scope of butt not, differential ring is limited in radially moving range.Especially, preferably have 1 differential ring restrictions at least, at least 1 the court moving range radially of differential ring is subjected to the restriction of differential ring restrictions, with other court's moving range radially of differential ring by limiting with contacting of described rotating shaft.This occasion, at least 2 gimbals rotate mutually in the opposite direction relatively, thereby can realize stable balance play quickly.Thereby can obtain the balance that lays particular stress on the heart.

Here, the differential ring restrictions is preferably formed as at least on either party of the axial restraint member that clips differential ring.This occasion does not need to be used to form the other member of differential ring restrictions, thereby can not increase the part number.

In addition, the heart of laying particular stress on of the present invention is eliminated mechanism, rotation is passed on the face of gimbal of axial restraint member, preferably has the protuberance that the gimbal that will contact with differential ring carries out local support.This occasion, when when beginning rotation and low speed rotation, each gimbal contacts on the big area of the outer peripheral portion of axial restraint member with the axial restraint member, under big frictional force, be subjected to the effect of revolving force, in case but high speed rotating, then gimbal is the center with the contact point with differential ring, carries out the part with protuberance and contacts, thereby the minimizing of the frictional force of gimbal and axial restraint member, can obtain the action of stable gimbal.

In addition, the heart of laying particular stress on of the present invention is eliminated mechanism, be preferably in form on the protuberance concavo-convex.This occasion can reduce the frictional force between gimbal and the axial restraint member, realizes stabilisation, thereby can realize the action of stable gimbal.

In addition, the heart of laying particular stress on of the present invention is eliminated mechanism, preferably has to make it be pressed against force application apparatus on the axial restraint member towards axial force distribution gimbal.Here, force application apparatus uses gimbal towards the leaf spring that axially carries out the application of force to well, and preferably central portion has the tabular surface with the gimbal butt, and at least 3 spring pins that extend towards circumferencial direction dispose the structure that forms equably on peripheral part.Leaf spring preferably puts at least one side who clips the relative axial restraint member of gimbal, gimbal is carried out the spring of the application of force towards any the opposing party's axial restraint member.In addition, force application apparatus is both towards the elastomer of axial protrusion, also the magnetic flux that is produced by magnet.

This occasion, because rotating shaft is in the middle of horizontal or vertical direction or its, all there is certain frictional force to put between gimbal and the axial restraint member, thereby can obtains and lay particular stress on the posture stable heart of laying particular stress on irrelevant, that performance change is little that the heart eliminates mechanism and eliminate mechanism.Therefore, rotating shaft can use under vertical any angle till level.

In addition, motor of the present invention is characterized in that, the heart of laying particular stress on rotary body of the invention described above is eliminated mechanism, in a distolateral interlocking of rotating shaft the rotating disk that carries the disc shaped recording medium, rotating disk double as one side's above-mentioned axial restraint member is arranged.Therefore, can eliminate, motor successfully is rotated the heart of laying particular stress on that has comprised rotating disk and all rotary bodies that are rotated body of lift-launch on this rotating disk.Therefore, can tackle the access speed that improves disc storage and read precision.

Here, the rotor yoke iron that the round-ended cylinder shape is arranged that drive magnet has been installed is arranged on the rotating shaft, preferably bottom double as the opposing party's of this rotor yoke iron axial restraint member.This occasion, rotor yoke iron double as axial restraint member, thereby can suppress the part number.And the differential ring restrictions is formed on the bottom that is preferably in rotor yoke iron.This occasion can be cut down the part number, be reduced cost, and makes equipment miniaturization.

The simple declaration of accompanying drawing

Fig. 1 is the vertical profile end view that the heart is eliminated an embodiment of mechanism of laying particular stress on of expression rotary body of the present invention.

Fig. 2 A is the cutaway view of expression along IIA-IIA line among Fig. 1.Fig. 2 B is the state after expression is dissectd with the IIB-IIB line of Fig. 1.

Fig. 3 is the stereogram that the heart is eliminated the disc rotating mechanism of mechanism of laying particular stress on that rotary body has been carried in expression.

Fig. 4 is the decomposition assembling figure that the heart is eliminated mechanism of laying particular stress on of expression rotary body.

Fig. 5 is the enlarged drawing of expression the 1st gimbal and the 3rd axial restraint member and the 1st axial restraint member.

Fig. 6 is the enlarged drawing of expression the 2nd gimbal and the 3rd axial restraint member and the 2nd axial restraint member.

Fig. 7 A is the schematic diagram of expression the 1st gimbal and differential ring relation, and Fig. 7 B is the enlarged drawing of its major part.

Fig. 8 A is the schematic diagram of expression the 2nd gimbal and differential ring relation, and Fig. 8 B is the enlarged drawing of its major part.

Fig. 9 is the key diagram of the differential rotation status of expression the 1st and the 2nd gimbal.

Figure 10 is the vertical profile end view of expression with the embodiment of the 2nd axial restraint member double as rotor yoke iron of laying particular stress on heart elimination mechanism of rotary body.

Figure 11 is the vertical profile end view that the heart is eliminated the embodiment on each gimbal of mechanism of laying particular stress on that expression is arranged on elastomer rotary body.

Figure 12 is the enlarged drawing of the major part of Figure 11.

Figure 13 A is expression with lay particular stress on state heart elimination mechanism dissect after of XIIIA-XIIIA line with rotary body, and Figure 13 B is the state after dissecing respectively with XIIIB-XIIIB.

Figure 14 is the vertical profile end view that the heart is eliminated other embodiment of mechanism of laying particular stress on of expression rotary body.

Figure 15 A is expression with lay particular stress on state heart elimination mechanism dissect after of XVA-XVA line with the rotary body of Figure 10.Figure 15 B is the state after dissecing respectively with XVB-XVB.

Figure 16 is the vertical profile end view that the heart is eliminated other embodiment of mechanism of laying particular stress on of expression rotary body.

Figure 17 A represents that Figure 17 B is the state after dissecing respectively with XVIIB-XVIIB with the vertical view of laying particular stress on the state after heart elimination mechanism is dissectd of XVIIA-XVIIA line with the rotary body of Figure 16.

Figure 18 is the vertical profile end view that the heart is eliminated the another embodiment of mechanism of laying particular stress on of expression rotary body.

Figure 19 A represents that Figure 19 B is the state after dissecing respectively with XIXB-XIXB with the vertical view of laying particular stress on the state after heart elimination mechanism is dissectd of XIXA-XIXA line with the rotary body of Figure 18.

Figure 20 is the vertical profile end view that the heart is eliminated other embodiment of mechanism of laying particular stress on of expression rotary body.

Figure 21 A represents that Figure 21 B is the state after dissecing respectively with XXIB-XXIB with the vertical view of laying particular stress on the state after heart elimination mechanism is dissectd of XXIA-XXIA line with the rotary body of Figure 20.

Figure 22 is that expression is eliminated the vertical profile end view that the 3rd axial restraint member of mechanism is fixed in the embodiment of the 2nd axial restraint member with the heart of laying particular stress on of rotary body.

Figure 23 is that expression is eliminated the vertical profile end view that the 3rd axial restraint member of mechanism is fixed in the embodiment of the 1st axial restraint member with the heart of laying particular stress on of rotary body.

Figure 24 is that expression is eliminated the vertical profile end view that the 3rd axial restraint member of mechanism is fixed in the embodiment of the 1st axial restraint member and the 2nd axial restraint member with the heart of laying particular stress on of rotary body.

Figure 25 is that expression is eliminated the vertical profile end view that the 2nd axial restraint member of mechanism is used for the embodiment of rotor yoke iron with the heart of laying particular stress on of rotary body.

The longitudinal sectional view of Figure 26 embodiment that to be expression push gimbal towards the axial restraint member with spring.

Figure 27 is the spring of expression elimination mechanism shown in Figure 26 and the vertical view of the 3rd axial restraint component relation.

Figure 28 is the exploded perspective view of the elimination mechanism of expression Figure 26.

Figure 29 is the stereogram of other embodiment of the spring that uses in the elimination mechanism of expression Figure 26.

Figure 31 is the cross-sectional plan view that the heart is eliminated mechanism that lays particular stress on of the traditional rotary body of expression.

Figure 32 is the cross-sectional plan view that the heart is eliminated other examples of mechanism that lays particular stress on of the traditional rotary body of expression.

Figure 33 is the cross-sectional plan view that the heart is eliminated another example of mechanism that lays particular stress on of the traditional rotary body of expression

Figure 34 is that the heart of laying particular stress on of the traditional rotary body of expression is eliminated the longitudinal section of another example of mechanism and the vertical view that gimbal moves.

Figure 35 A～35C is the key diagram that the gimbal of the elimination mechanism of expression Figure 34 moves.

Embodiment

Below, with reference to embodiment shown in the drawings structure of the present invention is described.Fig. 1～Fig. 9 eliminates a embodiment on the rotating shaft 4 of motor 3 that mechanism 1 is arranged on disc rotating mechanism 2 with the heart of laying particular stress on of rotary body of the present invention.This is laid particular stress on the heart and eliminates mechanism 1 disc shaped recording medium such as the CD-ROM that comprises rotating shaft 4 and install with its one rotation or other hearts of laying particular stress on that is rotated all rotary bodies of body (be referred to as in this specification and be rotated body) 5 are eliminated usefulness, and it comprises: with respect to rotating shaft 4 axial separate configuration and with respect to rotating shaft 4 at least 2 gimbals 9,10 that radially embed movably; Be configured in each inboard of this gimbal 9,10 and the differential ring 11,12 that can embed with respect to rotating shaft 4 with moving radially; Rotate, axially contacting and giving the axial restraint member 6,7,8 of rotation with rotating shaft 4 one by friction with gimbal 9,10 and differential ring 11,12.Among this embodiment, gimbal is made of 2 the 1st gimbals 9 and the 2nd gimbal 10, and the 1st, the 2nd differential ring 11,12 is configured in each inboard of the 1st and the 2nd gimbal 9,10, and is radially embedding movably with respect to rotating shaft 4.In addition, as to gimbal 9, the 10 and the 1st, the 2nd differential ring 11,12 give the rotation and to moving axially the axial restraint member that limits, by the 3rd axial restraint member 7, the 1st axial restraint member 6 and the 2nd axial restraint member 8 constitute, wherein, the configuration of the 3rd axial restraint member 7 be located at rotating shaft 4 axially on the 1st and the 2nd gimbal 9, between 10, rotate with rotating shaft 4 one, make the 1st, the 2nd gimbal 9,10 separate mutually non-contiguously, and the 1st axial restraint member 6 and the 2nd axial restraint member 8 and the rotation of rotating shaft 4 one, and be configured in the 1st, the 2nd gimbal 9, the 10 and the 1st, the 2nd differential ring 11,12 the axial outside (about among Fig. 1 being) is to towards axial mobile the restriction.In addition, around the 2nd differential ring 12 of the 2nd axial restraint member 8 and the 3rd axial restraint member 7 face relative to each other, be formed with the 2nd differential ring 12 in radially the mobile differential ring restrictions 14 that limits.

Above-mentioned the 1st～the 3rd axial restraint member 6,7,8, especially be configured in the posture of downside in rotating shaft 4 arranged perpendicular and motor rotor, the moving axially promptly to descend of 7 pairs the 1st of the 2nd axial restraint member 8 and the 3rd axial restraint members, the 2nd gimbal 9,10 and the 1st, the 2nd differential ring 11,12 limited, and simultaneously rotation passed to the 1st, the 2nd gimbal 9,10 and the 1st, the 2nd differential ring 11,12.Then, the major function of Ci Shi the 1st axial restraint member 6 is that the 1st gimbal 9 and the 1st differential ring 11 are limited towards axial mobile i.e. come-up.

Shown in Fig. 2 A and Fig. 2 B, the 1st differential ring 11 radially connects movably and inserts rotating shaft 4, and its internal diameter forms greatlyyer than the external diameter of rotating shaft 4.Here, the relation between the internal diameter of the 1st differential ring 11 and rotating shaft 4 external diameters is 1 design considerations, carries out rationally determining according to the use rotating speed of the size of the lopsidedness of rotary body, rotating shaft, the time of advent till eliminate, the space of permission etc.In addition, the internal diameter of the 1st gimbal 9 forms greatlyyer than the external diameter of the 1st differential ring 11, can radially be provided with movably by relative the 1st differential ring 11.Here, the relation between the external diameter of the internal diameter of the 1st gimbal 9 and the 1st differential ring 11 is 1 design considerations, carries out rationally determining according to the use rotating speed of the size of the lopsidedness of rotary body, rotating shaft, the time of advent till eliminate, the space of permission etc.In addition, the internal diameter of the 1st gimbal 9 forms greatlyyer than the external diameter of the 1st differential ring 11, can radially be provided with movably by relative the 1st differential ring 11.The 2nd differential ring 12 is identical with the 1st differential ring 11, can insert rotating shaft 4 to radially connecting movably, and its internal diameter forms greatlyyer than the external diameter of rotating shaft 4.The internal diameter of the 2nd gimbal 10 forms greatlyyer than the external diameter of the 2nd differential ring 12, and being set as can be to radially moving with respect to the 2nd differential ring 12.The 3rd axial restraint member 7 and the rotation of rotating shaft 4 one are accepted supporting the 1st and the 2nd gimbal 9,10 and differential ring and are utilized frictional force transmission rotation, and the 1st gimbal 9 and the 2nd gimbal 10 are separated mutually non-contiguously.The the 1st and the 2nd axial restraint member 6,8 and the rotation of rotating shaft 4 one.Here comprise: to the 1st differential ring 11 and the 1st gimbal 9 towards axial mobile the 1st axial restraint member 6 that limits; To differential ring 12 and the 2nd gimbal 10 towards axial mobile the 2nd axial restraint member 8 that limits.

The central part of the face relative that differential ring restrictions 14 is formed on the 2nd axial restraint member 8 and the 3rd axial restraint member 7 with differential ring 12, circular depressions by the both ends that form size energy folding and unfolding the 2nd differential ring 12 is constituted, by the inner peripheral surface of this recess and the outer peripheral face butt of the 2nd differential ring 12, thereby limit the inner peripheral surface and rotating shaft 4 butts of the 2nd differential ring 12.Here, when the internal diameter of the 1st, the 2nd gimbal 9,10 is identical, differential ring court moving range radially by 14 couples one sides of differential ring restrictions limits, by restrictedly being provided with, make the direction that relatively moves of the 1st gimbal 9 and the 2nd gimbal 10 be respectively direction of advance and the direction that lags with the differential ring court moving range radially that contacts the opposing party of rotating shaft.Promptly, the difference of the internal diameter of the external diameter of the 2nd differential ring 12 and differential ring limiting member 14 becomes the speed difference of the 1st gimbal 9 and the 2nd gimbal 10, differential ring limiting member 14 is set, and a side gimbal is not contacted with rotating shaft 4 such as 11, this just makes the 1st gimbal 9 be opposite respectively direction with the direction that relatively moves of the 2nd gimbal 10.

The 1st differential ring 11, inner circumferential surface and rotating shaft 4 butts, thereby its court's mobile being restricted radially, in addition, the 2nd differential ring 12, its outer peripheral face and differential ring restrictions 14 butts and be restricted, thus with the 1st, the 2nd gimbal 9,10 of the 1st, the 2nd differential ring 11,12 butts, move in the opposite direction with respect to the rotation of rotating shaft 4.

A) differential ring periphery contact combination

1) in case rotating shaft 4 begins rotation, put at the 2nd gimbal 10 and the 2nd differential ring 12 that have on the 2nd axial restraint member 8 of differential ring restrictions 14 and have inertia force, at first to begin rotation than the 2nd axial restraint member 8 slow angular speed, soon, the frictional resistance that causes because of its gravity is still keeping putting beginning constant speed rotation under the state of the position on the 2nd axial restraint member 8.

2) whole rotary body has and lays particular stress on the heart and vibrate.

3) the 2nd gimbal 10 and the 2nd differential ring 12 connect and insert rotating shaft 4, although the 2nd gimbal 10 puts on the protuberance 20 of the 2nd axial restraint member 8, the 2nd differential ring 12 puts on the recess of the differential ring restrictions 14 that constitutes the 2nd axial restraint member 8, but its position is rotated in position arbitrarily, in case rotary speed increases, then centrifugal action is in the 2nd gimbal 10 and the 2nd differential ring 12, the frictional resistance that causes greater than gravity, in addition, vibration causes that coefficient of friction descends, thereby moves to peripheral direction from rotating shaft 4.

4) when rotary speed further rises, centrifugal force increases, then the centrifugal force of the 2nd gimbal 10 is dominant, and rotating shaft 4, differential ring restrictions the 14, the 2nd differential ring the 12, the 2nd gimbal 10 become linear array state (with reference to Fig. 2 B).The center of the contact point of the external diameter of the internal diameter of the recess of the contact point of the external diameter of the internal diameter of the 2nd gimbal 10 and the 2nd differential ring 12, differential ring limiting member 14 and the 2nd differential ring 12 and rotating shaft 4 state that is in line.

5) when rotary speed further rises, centrifugal force increases, rotating shaft is towards the CW rotation, when not having slippage and be prerequisite with each contact point, then 41 weeks of rotation of rotating shaft, the 2nd axial restraint member 8 that is fixed on the rotating shaft 4 also rotated for 1 week towards the CW direction.

6) internal diameter of the recess of differential ring limiting member 14 contacts with the external diameter of the 2nd differential ring 12, and the internal diameter of the recess of differential ring limiting member 14 makes the 2nd differential ring 12 rotate towards the CW direction.Not having slippage with contact point is prerequisite, then rotating shaft 4 rotations are during 1 week, its contact point limit changes position, limit rotation during 1 week, because of the internal diameter of the recess of differential ring limiting member 14 is bigger slightly than the external diameter of the 2nd differential ring 12, thereby the 2nd differential ring 12 becomes the contact point that relatively advances towards the CW direction with diameter phase residual quantity.At this moment, differential ring earlier is rotated in the same direction than rotating shaft.

7) on the other hand, the 2nd gimbal 10 is accepted revolving force at contact point from the 2nd differential ring 12, rotating shaft 4 is after 1 weeks of rotation, with the internal diameter distance of the gimbal of the equal-sized distance of internal diameter distance of the recess of differential ring limiting member 14, makes contact point move and carry out rotation towards the CW direction.Though the 2nd differential ring 12 earlier is rotated than rotating shaft 4,, approximately be 3 times of differential ring such as the occasion of illustrated embodiment, thereby its rotary speed is about 1/3rd because the internal diameter of the 2nd gimbal 10 is big.

8) carry out rotation by the 2nd gimbal 10, thereby the frictional resistance of the protuberance 20 of utilization and the 2nd axial restraint member 8, the 2nd gimbal 10 limits are changed with contact point, the limit of differential ring towards the CW direction like rotating shaft 4 Ho La hoops (Off ラ Off one プ), carry out whirling, promptly so-called revolution.At this moment, rotary speed is slower than rotating shaft.

B) week contact combination in the differential ring

9) in case rotating shaft 4 begins rotation, the 1st gimbal 9 and the 1st differential ring 11 that put on the 3rd axial restraint member 7 have inertia force, at first to begin rotation than the 3rd axial restraint member 7 slow angular speed, soon, the frictional resistance that causes because of its gravity makes it keep putting beginning constant speed rotation under the state of the position on the 3rd axial restraint member 7.

10) whole rotary body has and lays particular stress on the heart and vibrate.

11) the 1st gimbal 9 and the 1st differential ring 11 connect and insert rotating shaft 4, although the 1st gimbal 9 and the 1st differential ring 11 put on the protuberance 20 of the 3rd axial restraint member 7, but its position is rotated in position arbitrarily, in case rotary speed increases, then centrifugal action is in the 1st gimbal 9 and the 1st differential ring 11, the frictional resistance that causes greater than gravity, in addition, vibration causes that coefficient of friction descends, thereby moves to peripheral direction from rotating shaft 4.

12) when rotary speed further rises, when centrifugal force increases, then the centrifugal force of the 1st gimbal 9 is dominant, rotating shaft the 4, the 1st differential ring the 11, the 1st gimbal 9 becomes linear array state (with reference to Fig. 2 A).The contact point of the external diameter of the internal diameter of the contact point of the external diameter of the internal diameter of the 1st gimbal 9 and the 1st differential ring 11, the 1st differential ring 11 and rotating shaft 4 state that is in line.

13) when rotary speed further rises, centrifugal force increases, rotating shaft 4 is towards the CW rotation, when not having slippage and be prerequisite with each contact point, then 41 weeks of rotation of rotating shaft, the 3rd axial restraint member 7 that is fixed on the rotating shaft 4 also rotated for 1 week towards the CW direction.

14) external diameter of rotating shaft 4 contacts with the internal diameter of the 1st differential ring 11, and the external diameter of rotating shaft 4 makes the 1st differential ring 11 rotate towards the CW direction.If do not have slippage with contact point is prerequisite, then rotating shaft 4 rotations are during 1 week, its contact point limit changes position, limit rotation during 1 week, and because of the external diameter of rotating shaft 4 is slightly littler than the internal diameter of the 1st differential ring 11, thereby the 1st differential ring 11 becomes the contact point that relatively lags towards the CCW direction with diameter phase residual quantity.At this moment, the 1st differential ring 11 is than rotating shaft 4 rotation in the same direction slowly.

15) on the other hand, the 1st gimbal 9 is accepted revolving force at contact point from differential ring 11, rotating shaft is after 41 weeks of rotation, with with the equal-sized distance of the external diameter of rotating shaft 4 distance * make the internal diameter distance of contact point towards CCW direction shifting balance ring 9 with distance that the internal diameter of differential ring 11 equates with the radial delta of external diameter, and carry out rotation.Though the 1st differential ring 11 is rotated slowly than rotating shaft 4,, approximately be 3 times of differential ring such as the occasion of illustrated embodiment, thereby its rotary speed is about 1/3rd because the internal diameter of the 1st gimbal 9 is big.

16) carry out rotation by the 1st gimbal 9, thus the frictional resistance of the protuberance 20 of utilization and the 3rd axial restraint member 7, and the 1st gimbal 9 limits change with contact point, the limit of the 1st differential ring 11 towards the CCW direction revolves round the sun like rotating shaft 4 Ho La hoops.At this moment, rotary speed is slower than rotating shaft 4.

Like this, can successfully obtain the balance that lays particular stress on the heart.Here, it is poor that the external diameter of the internal diameter of the 1st differential ring 11 and the 2nd differential ring 12 is provided with, and can make the 1st and the 2nd gimbal 9,10 produce speed differences.Thus, can successfully obtain the balance that lays particular stress on the heart.

The 1st axial restraint member 6 constitutes by being pressed into the rotating disk that is fixed in rotating shaft 4 front ends in the occasion of present embodiment.Be rotated body 5 and put on the 1st axial restraint member 6, be clamped in and carry out the one rotation between the not shown anchor clamps.Therefore, in the present embodiment, made and to have added the structure that the heart is eliminated that lays particular stress on together to comprising all rotary bodies that are rotated body 5 and the 1st axial restraint member 6 (also comprising the 3rd axial restraint member 7 and the 2nd axial restraint member 8) and motor.

And the 3rd axial restraint member 7 and the 2nd axial restraint member 8 are going into to be fixed on the rotating shaft 4 than 6 more close motor 3 side pressures of the 1st axial restraint member.In addition, as shown in Figure 3, this disc rotating mechanism 2, successively on base station 13 assembling motor 3, lay particular stress on the rotating disk 6 that the heart is eliminated mechanism 1 and is used for the 1st axial restraint member, on rotating disk 6, carry and be rotated body 5.

As shown in figure 25, on the base station 13 of dual-purpose circuit substrate, be fixed with the bearing supporting mass 40 of the hollow that has step of supporting stator core 41.Be fixed with journal bearing 42, the thrust bearing 43 of supporting rotating shaft 4 in the inboard of bearing supporting mass 40.Be fixed with the stator core 41 that is wound with coil 15 in the outside of bearing supporting mass 40.In the present embodiment, the configuration of rotating shaft 4 vertical ground.

Motor 3 has coil 15, the rotor yoke iron 16 in stator core of being wound on 41 and is fixed on drive magnet 17 on this yoke 16.Rotor yoke iron 16 is cup-shaped promptly the cylindric of the end.Rotating shaft 4 is pressed into the bottom center that is fixed in rotor yoke iron 16.Drive magnet 17 after the cylindrical portion inboard of rotor yoke iron 16 is fixed with relative cylindraceous multipole magnetized of coil 15 with stator core 41.And the heart of laying particular stress on shown in Figure 25 is eliminated mechanism 1, as described later, is the embodiment that the 2nd axial restraint member 8 is used for rotor yoke iron 16.

The 1st axial restraint member 6 is equipped with being rotated body 5 and being rotated of disc shaped recording medium of being included in a rotating body etc.Central portion at the 1st axial restraint member 6 is formed with the protuberance 31 that protrudes towards the opposition side of motor 3.By through hole and this protuberance 31 chimeric positioning with the central portion of rotary body 5.The edge portion of this protuberance 31 can be easily chimeric with being rotated body 5 through chamfered.

In addition, be formed with the recess 19 of ring-type at the protuberance 31 of the 1st axial restraint member 6.Magnet 18 embeds in this recess 19.This magnet 18 is used to adsorb the anchor clamps (not shown) that constituted or contained magnetic material by magnetic material, is arranged in the 1st axial restraint member 6 and is clipped between the anchor clamps of this magnet 18 absorption to be rotated body 5 and to fix.In addition, although not shown, the anchor clamps rotation is installed on the hinge arms (not shown) of device body such as CD/CDRW/DVD record reproducing device body freely.

The 1st differential ring 11 and the 1st gimbal 9 are configured on the same axle right-angle plane, clip from axial both sides by the 1st discoideus axial restraint member 6 and the 3rd axial restraint member 7, axially have slightly loosening, move for rotatable, and be set with the interval of their thickness and the 1st axial restraint member 6 and the 3rd axial restraint member 7.Here, fricton-tight with the outer peripheral face of the inner peripheral surface of the outer peripheral face of the 1st differential ring 11 and the 1st differential ring 11 and rotating shaft 4 is prerequisite, the external diameter that the internal diameter that the diameter of rotating shaft 4 is made as d1, the 1st differential ring 11 is made as d2, the 1st differential ring 11 is made as d3, when the 1st gimbal 9 was a center whirling 1 time with rotating shaft 4, the internal diameter of the 1st gimbal 9 constituted with respect to the relative rotation displacement of rotating shaft 4: π (d2-d1) * d3/d2.

In addition, the 1st axial restraint member 6 and the 3rd axial restraint member 7 are to be fixed on the rotating shaft 4 such as the mode that is pressed into such as incorporate on direction of rotation and axial both direction.Central portion at the face of facing mutually with the 1st gimbal 9 of the 1st axial restraint member 6 and the 3rd axial restraint member 7 forms the protuberance 20 that circle shown in Figure 5 is protruded.This protuberance 20 is in case excessive with the contact area of the 1st, the 2nd gimbal 9,10, then and the frictional force between the 1st, the 2nd gimbal 9,10 become excessive and hinder and to carry out independent rotatablely moving, on the contrary, too narrowly then can not get making gimbal to be rotated required enough frictional force, the action instability that causes gimbal, therefore, they are the contacts area that are used to obtain carrying out the balance size.Such as, the fulcrum of the mobile rotation of the 1st gimbal 9 is the contact points with the 1st differential ring 11, thereby make the peripheral part of the 1st axial restraint member 6 and the 3rd axial restraint member 7 do thinlyyer than middle body, make protuberance 20 shapes with part face, that can support the 1st gimbal 9 that contacts with the 1st differential ring 11 at least that the 1st gimbal 9 is faced mutually.Therefore, the frictional force of the 1st gimbal 9 and the 3rd axial restraint member 7 can be reduced, the action of the 1st stable gimbal 9 can be obtained.

The differential ring restrictions 14 that moving radially of the 2nd differential ring 12 limited in the occasion of present embodiment, is made of the recess that forms on the 2nd axial restraint member 8 and the 3rd axial restraint member 7 and the face that the 2nd differential ring 12 sides are faced mutually.That is, the 2nd axial restraint member 8 and the 3rd axial restraint member 7 are used for the part that forms differential ring restrictions 14.Here, the internal diameter of the 2nd differential ring 12 is bigger than the difference and the rotating shaft 4 diameter sums of the external diameter of the internal diameter of differential ring restrictions 14 and the 2nd differential ring 12.And, be arranged to the relation of (external diameters of internal diameter-Di 2 differential rings 12 of differential ring restrictions 14)＜(external diameter of the internal diameter-rotating shaft 4 of the 2nd differential ring 12).Therefore, fricton-tight with the inner peripheral surface place of the outer peripheral face of the inner peripheral surface of the differential ring restrictions 14 of the differential ring restrictions 14 of the outer peripheral face of the 2nd differential ring 12 and the 3rd axial restraint member 7 and the 2nd axial restraint member 8, the 2nd differential ring 12 and the 2nd gimbal 10 is prerequisite, the external diameter that the diameter of differential ring restrictions 14 is made as d4, the 2nd differential ring 12 is made as d5, when the 2nd gimbal 10 was a center whirling 1 time with rotating shaft 4, the internal diameter of the 2nd gimbal 10 constituted with respect to the relative rotation displacement of rotating shaft 4: π (d4-d5).

The internal diameter of the 2nd gimbal 10 is greater than the external diameter of the 2nd differential ring 12.The external diameter of the 1st gimbal and the 2nd gimbal can freely be selected in satisfying the scope of above-mentioned condition, and in addition, the quality of the 1st gimbal and the 2nd gimbal can at random be set by changing thickness and material.

The 2nd differential ring 12 and the 2nd gimbal 10 are identical with the 1st differential ring 11 and the 1st gimbal 9, be configured on the same axle right-angle plane, clip from axial both sides by the 2nd discoideus axial restraint member 8 and the 3rd axial restraint member 7, axially having looseningly slightly, be rotatable interval of moving the thickness and the 2nd axial restraint member 8 and the 3rd axial restraint member 7 that are set with them.

In addition, the 2nd axial restraint member 8 is so that direction of rotation and axially incorporately for example be pressed into mode and be fixed on the rotating shaft 4.The central portion of the face of facing mutually at the 2nd axial restraint member 8 and the 2nd gimbal 10 as shown in Figure 6, is identically formed the circular protuberance 20 that protrudes with the 1st axial restraint member 6 and the 3rd axial restraint member 7.That is, the fulcrum of the mobile rotation of the 2nd gimbal 10 is the contact points with the 2nd differential ring 12, thereby the part that can support the 2nd gimbal 10 that contacts with the 2nd differential ring 12 is at least made protuberance 20 shapes.Therefore, the frictional force of the 2nd gimbal 10 and the 2nd axial restraint member 8 can be reduced, the action of the 2nd stable gimbal 10 can be obtained.And, the 2nd differential ring 12 and the 2nd gimbal 10 are identical with the 1st differential ring 11 and the 1st gimbal 9, being configured on the same axle right-angle plane, axially having looseningly slightly, is rotatable interval of moving the thickness and the 2nd axial restraint member 8 and the 3rd axial restraint member 7 that are set with them.

And the 1st, the 2nd differential ring the 11,12, the 1st, the 2nd gimbal the 9,10, the 3rd axial restraint member the 7, the 1st, the 2nd axial restraint member 6,8 preferably uses the material of wear-resisting wiping and low-friction coefficient, or carries out such surface treatment.

Below the above-mentioned heart of laying particular stress on is eliminated the action of mechanism 1 and is described.

After motor 3 is driven, the 1st gimbal the 9, the 1st differential ring the 11, the 2nd gimbal the 10, the 2nd differential ring 12 that is not connected with rotating shaft 4 because of himself inertia and with the 3rd axial restraint member 7 and each axial restraint member 6,8 between frictional force, than rotating shaft 4 slowly court and rotating shaft 4 identical directions begin to rotate.

The 1st gimbal 9 because of centrifugal force to radially moving, shown in Fig. 2 A, become with the 1st differential ring 11 state of contact in, the 1st differential ring 11 becomes and rotating shaft 4 state of contact.In addition, the 2nd gimbal 10 because of centrifugal force to radially moving, shown in Fig. 2 B, become with the 2nd differential ring 12 state of contact in, the 2nd differential ring 12 becomes the inner peripheral surface state of contact with the differential ring restrictions 14 of the 3rd axial restraint member 7 and the 2nd axial restraint member 8, after the rotation of rotating shaft 4 was further risen, the 1st gimbal 9 and the 2nd gimbal 10 progressed into differential motion with respect to rotating shaft 4.

Below the differential motion with respect to rotating shaft 4 is described in detail.Fricton-tight with the outer peripheral face of the inner peripheral surface of the outer peripheral face of the 1st differential ring 11 and the 1st differential ring 11 and rotating shaft 4 is prerequisite, the external diameter that the internal diameter that the diameter of rotating shaft 4 is made as d1, the 1st differential ring 11 is made as d2, the 1st differential ring 11 is made as d3, when the 1st gimbal 9 was a center whirling 1 time with rotating shaft 4, the internal diameter of the 1st gimbal 9 constituted with respect to the relative rotation displacement of rotating shaft 4: π (d2-d1) * d3/d2.Therefore, the 1st gimbal 9 and the 1st differential ring 11 are by doing shimmy gyration with respect to rotating shaft 4, and side is carried out differential motion lagging relatively.

On the other hand, fricton-tight with the inner peripheral surface place of the outer peripheral face of the inner peripheral surface of the differential ring restrictions 14 of the differential ring restrictions 14 of the outer peripheral face of the 2nd differential ring 12 and the 3rd axial restraint member 7 and the 2nd axial restraint member 8, the 2nd differential ring 12 and the 2nd gimbal 10 is prerequisite, the external diameter that the diameter of differential ring restrictions 14 is made as d4, the 2nd differential ring 12 is made as d5, when the 2nd gimbal 10 was a center whirling 1 time with rotating shaft 4, the internal diameter of the 2nd gimbal 10 constituted with respect to the relative rotation displacement of rotating shaft 4: π (d4-d5).Therefore, the 2nd gimbal 10 and the 2nd differential ring 12 carry out differential motion by doing shimmy gyration with respect to rotating shaft 4 in relative advance side.

Therefore, shown in Fig. 7 A, 7B and Fig. 8 A, 8B, the 1st gimbal of seeing from rotating shaft 49 and the direction of rotation of the 2nd gimbal 10 become opposite each other direction because of differential motion.Thereby the position of laying particular stress on the heart is eliminated in arrival the earliest.

Eliminate in the device of mechanism 1 at the heart of laying particular stress on present embodiment, lay particular stress on the heart in case exist, the comprehensive heart of laying particular stress on that comprises the rotary body integral body that is rotated body 5 of laying particular stress on the device integral body of heart elimination mechanism 1 causes vibration.In general, the coefficient of friction between the different object of resonance frequency reduces along with the generation of vibration.For this reason, by acting on each gimbal 9,10 centrifugal force such as Fig. 2 A, shown in Fig. 2 B, the 1st gimbal 9, the 1st differential ring 11 and rotating shaft contact, and under the inner peripheral surface state of contact of the 2nd gimbal 10 and the 2nd differential ring 12 and differential ring restrictions 14, as the whole disequilibrium of rotary body, will vibrate, resistance to sliding between the 1st gimbal 9 and the 3rd axial restraint member 8 and the 2nd gimbal 10 and the axial restraint member 8 increases because of vibration, reduce repeat function, the moment that resistance to sliding reduces, the 1st gimbal 9 and the 1st differential ring 11 and the 2nd gimbal 10 and the 2nd differential ring 12 are done shimmy revolution with respect to rotating shaft 4.Then, the 1st gimbal 9 and the 1st differential ring 11 and the 2nd gimbal 10 and the 2nd differential ring 12 repeat differential motion discontinuously with respect to rotating shaft 4, when rotary body integral body averages out, the vibration convergence, then the resistance to sliding between the 1st gimbal 9 and the 3rd axial restraint member 7 and the 2nd gimbal 10 and the 2nd axial restraint member 8 increases, the 1st gimbal 9 and the 1st differential ring 11 and the 2nd gimbal 10 and the 2nd differential ring 12 change over to rotating shaft 4 and make constant speed rotation, balance end-of-job.

In addition, stay imbalance slightly under a certain rotary speed, rotating shaft 4 and the 1st gimbal 9 and the 1st differential ring 11 and the 2nd gimbal 10 and the 2nd differential ring 12 rotate with constant speed, and, in the further occasion that increases of the rotary speed of motor 3, corresponding therewith vibration takes place.Therefore, resistance to sliding between the 1st gimbal 9 and the 3rd axial restraint member 7 and the 2nd gimbal 10 and the 2nd axial restraint member 8 increases, reduces repeat function because of vibration, the moment that resistance to sliding reduces, each gimbal 9,10 is subjected to air drag and has broken away from and the rotation of the constant angular velocity of rotating shaft 4, enter above-mentioned shimmy revolution differential motion shown in Figure 9, repeat differential motion discontinuously with respect to rotating shaft 4.Then, when rotary body integral body averages out, the vibration convergence, then the resistance to sliding between the 1st gimbal 9 and the 3rd axial restraint member 7 and the 2nd gimbal 10 and the 2nd axial restraint member 8 increases, the 1st gimbal 9 and the 1st differential ring 11 and the 2nd gimbal 10 and the 2nd differential ring 12 change over to rotating shaft 4 and make constant speed rotation, balance end-of-job.In addition, heart direction is laid particular stress in symbol 38 expressions among the figure, and α represents the amount of movement of 1st differential ring 11 of rotating shaft 4 rotations during 1 week, and β represents the amount of movement of rotating shaft 4 rotations the 2nd differential ring 12 during 1 week.

Below, above-mentioned adjusting of laying particular stress on heart elimination mechanism 1 is described.

It is by carrying out such as the external diameter, internal diameter, the thickness of slab that change the 1st, the 2nd gimbal 9,10 or the 1st, the 2nd differential ring 11,12 that the lopsidedness that should eliminate is regulated.In addition, material by changing the 1st, the 2nd gimbal 9,10 or the 1st, the 2nd differential ring 11,12 etc. changes proportion, regulates lopsidedness with this.

Scalable ring diameter ratio when in addition, the 1st, the 2nd gimbal 9,10 being changed with respect to the relative angular velocity of rotation condition of rotating shaft 4.Such as, for the 1st gimbal 9 and the 1st differential ring 11 that differential ring is limited radially mobile utilization and contacting of rotating shaft, change the internal diameter of internal diameter, external diameter and the 1st gimbal 9 of the 1st differential ring 11.In addition, for to contact 2nd gimbal 10 and 2nd differential ring 12 that limit of differential ring, change the external diameter of the 2nd differential ring 12, the internal diameter of differential ring restrictions 14 and the internal diameter of the 2nd gimbal 10 at the inner peripheral surface of radially mobile utilization and differential ring restrictions 14.At this moment, preferably chain rate is set at the 1st, the 2nd gimbal 9,10 is moved.

In addition, the foregoing description is a preferable embodiment of the present invention, but is not limited thereto, and implements as long as can carry out various distortion in aim scope of the present invention.Such as, in the present embodiment, be primarily aimed at use the 1st and the example of the 2 two gimbal 9,10 and differential ring 11,12 be illustrated, but be not limited thereto, as long as have the gimbal more than at least 2 and the combination of differential ring, sometimes also can use gimbal and differential ring more than 3.By the occasion that constitutes of 2 gimbals and differential ring, can eliminate with minimal space and part number and lay particular stress on the heart.

In addition, among the embodiment of Fig. 1, close motor 3 sides of the 3rd axial restraint member 7 be provided with differential ring restrictions 14 and with the 2nd differential ring 12 of the inner peripheral surface butt of this differential ring restrictions 14, simultaneously, the 3rd axial restraint member 7 away from a side setting of motor 3 and the 1st differential ring 11 of rotating shaft 4 butts, but also can dispose on the contrary up and down.Promptly, at the motor 3 side settings of the 3rd axial restraint member 7 and the 1st differential ring 11 of rotating shaft 4 butts, simultaneously, motor 3 opposition sides of the 3rd axial restraint member 7 be provided with differential ring restrictions 14 and with the 2nd differential ring 12 of the inner peripheral surface butt of this differential ring restrictions 14.

In addition, among the embodiment of Fig. 1, as differential ring to a side, utilized differential ring restrictions 14 such as the 2nd differential ring 12 court's mobile devices that limit radially, as differential ring, utilized rotating shaft 4 such as the 1st differential ring 11 court's mobile devices that limit radially, but be not limited thereto the opposing party, also can be as shown in figure 14, both sides' differential ring 11,12 is had differential ring restrictions 14.

Promptly, shown in Figure 18 and Figure 19 A, 19B, also differential ring restrictions 14 can be set around each of the 1st and the 2nd differential ring 11,12, by the 1st differential ring 11 and the 2nd differential ring 12 both sides being contacted with the inner peripheral surface of differential ring restrictions 14 with to radially mobile the restriction.This occasion, each differential ring 11,12 carries out same motion.Here, internal diameter by making the 1st gimbal 9 and the 2nd gimbal 10 is made different slightly than the internal diameter of, each differential ring restrictions 14 than the internal diameter of, the 1st differential ring 11 and the 2nd differential ring 12, setting for advances with respect to the rotation of rotating shaft 4 carries out differential motion with different translational speeds when moving rotation.Thus, can eliminate the comprehensive heart of laying particular stress on that comprises the rotary body that is rotated body 5.

In addition, can shown in Figure 16 and Figure 17 A, 17B, differential ring restrictions 14 be set yet, and by with contacting of rotating shaft 4 the 1st differential ring 11 and the 2nd moving radially of differential ring 12 being limited.This occasion, each differential ring 11,12 carries out same motion.For this reason, internal diameter by making the 1st gimbal 9 and the 2nd gimbal 10 is made different slightly than the internal diameter of, the 1st differential ring 11 and the 2nd differential ring 12 and external diameter ratio, set rotation with respect to rotating shaft 4 for and lag and carry out differential motion with different translational speeds when moving rotation.Thus, can eliminate the comprehensive heart of laying particular stress on that comprises the rotary body that is rotated body 5.

In addition, among the embodiment of Fig. 1, differential ring restrictions 14 with the face of axial restraint member that the 2nd differential ring 12 is faced mutually such as the both sides of the 3rd axial restraint member 7 and the 2nd axial restraint member 8 on form, the two ends of the 2nd differential ring 12 are limited simultaneously.But, be not limited thereto, as long as at least a side, be provided with on the face of a side that is urged all the time such as the 2nd gimbal 10 and get final product.Such as, as shown in figure 10, clip 1 the 2nd differential ring 12 and in relative 2 axial restraint members either party, but such as the structure that also only forms at the 3rd axial restraint member 7.

In addition, among the embodiment of above-mentioned Fig. 1, the 2nd axial restraint member 8 is provided with as independent member, but is not limited thereto, also can be as Figure 10 and shown in Figure 25, with rotor yoke iron 16 dual-purposes of motor 3.This occasion can reduce the member number.During thus with the 2nd axial restraint member 8 and rotor yoke iron 16 dual-purposes, also can be as shown in figure 10, make at the 2nd axial restraint member 8 occasion of differential ring restrictions 14 and as shown in figure 25 is not set, any in the occasion of differential ring restrictions 14 is set at the 2nd axial restraint member 8.

And, in the foregoing description, mainly rotating shaft 4 verticals occasion up is illustrated, but is not limited thereto, such as also to the incline direction between the horizontal direction.Vertical is direction occasion in addition up, it is different with the influence of the gravity of gimbal 9,10 to act on each differential ring 11,12, the contact condition of each differential ring 11,12 and gimbal 9,10 and the 3rd axial restraint member 7 or the 2nd axial restraint member 8 changes, coefficient of friction changes, thereby lays particular stress on the performance that the heart eliminates and also change.Therefore, even in order also to reduce performance change at vertical direction, horizontal direction or incline direction between the two, force application apparatus preferably is set, to the 1st, the 2nd gimbal 9,10 towards axial force distribution, to in the 3rd axial restraint member 7 or the 1st, the 2nd axial restraint member 6,8 either party or sometimes both sides are pushed, the 1st, the 2nd gimbal 9,10 is applied faint elastic load.

Such as, shown in Figure 11 and Figure 13 A, 13B, the two sides that is provided with each gimbal 9,10 applies the force application component of faint elastic force such as elastomer 21.The elastomer 21 of the 1st gimbal 9 stably keeps the 1st gimbal 9 by contacting with the 3rd axial restraint member 7 with the 1st axial restraint member 6.The elastomer 21 of the 2nd gimbal 10 stably keeps the 2nd gimbal 10 by contacting with the 3rd axial restraint member 7 with the 2nd axial restraint member 8.Thus, though rotating shaft 4 in horizontal or vertical direction or both centres, frictional force also is certain, thereby can obtain the little stable heart of laying particular stress on of performance change and eliminate mechanism 1.As elastomer 21, such as, shown in Figure 11～Figure 13 A, 13B, be the ring that disposes with gimbal 9,10 concentric shape ground, use the structure of the slightly pointed cone shape cross section of fore-end tool that contacts with each axial restraint member 6,7,8.This endless elastomeric 21 is chimeric with the recess on the surface of each gimbal 9,10 by being arranged to its part, and the axial plane of ring-type distribution simultaneously connects gimbal 9,10 ground and embeds, thereby can not break away from.As elastomer, the member that can use synthetic rubber and rubber-like rubber-like plastics (they are generically and collectively referred to as elastoplast), silicone rubber etc. to constitute.

In the present embodiment, elastomer 21 is arranged to the 1st axial restraint member 6 relative with clipping each gimbal 9,10 and the face sliding contact simultaneously of the 3rd axial restraint member 7 and the 3rd axial restraint member 7 and the 2nd axial restraint member 8, each relative face is provided with protuberance 20, but when make by the application of force of gravity or force application apparatus the 1st, the 2nd gimbal 9,10 and differential ring towards certain direction by the occasion of butt, on the face of the side that the 1st, the 2nd gimbal 9,10 etc. is urged all the time, be provided with at least and get final product.In addition, even in order also to reduce performance change in vertical direction and horizontal direction, each gimbal 9,10 also can be made of magnetic.That is, shown in Figure 14 and Figure 15 A, 15B, the 1st gimbal 9 is subjected to being installed in the influence of magnetic force of the magnet 18 of the anchor clamps absorption usefulness on the 1st axial restraint member 6, is attracted to the 1st axial restraint member 6 sides.In addition, the 2nd gimbal 10 be subjected to motor 3 drive magnet 17 magnetic force influence and drawn by axial restraint member 8 side draughts.Thus, the faint magnetic load (magnetic attracting force) that is attracted by the 1st, the 2nd axial restraint member 6,8 corresponding with each gimbal 9,10 is towards axial action, thereby be not vulnerable to the influence of the posture change of device, can reduce performance change in vertical direction and horizontal direction, can obtain the stable heart balance that lays particular stress on.

In addition, Figure 26～embodiment shown in Figure 28, also can between the 1st gimbal 9 and the 3rd axial restraint member 7, have 1st force application apparatus 32 of the 1st gimbal 9 towards axial force distribution, between the 2nd gimbal 10 and the 2nd axial restraint member 8, have 2nd force application apparatus 33 of the 2nd gimbal 10 towards axial force distribution, the 1st gimbal 9 is pushed gently towards the 1st axial restraint member (rotating disk) 6, the 2nd gimbal 10 is pushed gently towards the 3rd axial restraint member 7.As the 1st and the 2nd force application apparatus 32,33, the leaf spring of metal preferably, it puts at least one side of the 3rd axial restraint member 7 or axial restraint member 8 to 6, and gimbal 9 or 10 is carried out the application of force towards the 3rd axial restraint member 7 or axial restraint member 8 to 6 relative axial restraint member 6 to 8 or the 3rd axial restraint members 7.This leaf spring has tabular surface 34 with the 1st, the 2nd gimbal 9,10 butts at central portion as shown in figure 27, preferably will be configured the formation disk spring equably towards at least 3 spring pins 35 that circumferencial direction extends at peripheral part.This occasion can apply impartial spring force to the 1st, the 2nd gimbal 9,10 abreast, by the length of regulating spring pin 35, can easily regulate the spring force that is applied simultaneously.Here, tabular surface 34 preferably has the size with raised part 20 same degree.And, these tabular surface 34 parts and raised part 20 in the same manner than around protrude a little, can successfully slide with the 1st, the 2nd gimbal 9,10, the while is not yielding.And, as the spring of the 1st and the 2nd force application apparatus 32,33, as shown in figure 29, also can make the structure that the front end of spring pin 35 is fused with the connecting elements 36 of ring-type.This occasion is further disperseed the spring pressure that acts on the 1st, the 2nd gimbal 9,10 equably, is used in to eliminate laying particular stress on moving of the heart and more successfully carrying out of the 1st, the 2nd gimbal 9,10.In addition, the symbol among the figure 37 is holes that rotating shaft 4 is connected.

In addition, as shown in figure 30, spring 32,33 that also can be by making Figure 29 mutually oppositely, with aligned configuration between the connecting elements 36 of ring-type between the 1st, the 2nd gimbal 9,10, to the reverse application of force of the 1st, the 2nd gimbal 9,10 difference, can directly the 1st, the 2nd axial restraint member 6 and 8 being pushed towards the power of the degree that radially slides.This occasion is configured in by the 1st differential ring 11 towards the inboard of the 1st gimbal 9 of the 1st axial restraint member 6 application of forces and puts on tabular surface 34 parts of spring 32, and is radially supported slidably.In addition, form the protuberance 20 with each gimbal 9,10 local butt on the face that the 1st, the 2nd axial restraint member 6 and each gimbal 9,10 of 8 are urged, each gimbal 9,10 is moved radially reaching circumferencial direction.The occasion of this embodiment, the 1st, the 2nd gimbal 9,10 and the 1st, the 2nd differential ring 11,12 that is configured in its inboard by being to slide towards radially reaching circumferencial direction on the tabular surface 34 of spring at the 1st and the 2nd force application apparatus 32,33, are eliminated laying particular stress on the heart respectively.Can save the 3rd axial restraint member 7 that is configured between the 1st, the 2nd gimbal 9,10, can realize reducing the part number and cost reduction that brings and the miniaturization of laying particular stress on heart elimination mechanism.And spring 32,33 can be used as 1 part to handle as combining with ring-type connecting elements 36 parts of periphery by spot welding, soldering, bonding etc., makes assembling operation become easy.

And, although not shown, in order on vertical direction and horizontal direction, to reduce performance change, the viscous grease that also can add the thermal endurance that has the heatproof degree and change, can not disperse because of centrifugal force.

In addition, in the foregoing description, 1st, there is no particular limitation for the material of the 2nd differential ring 11,12 and the 1st, the 2nd gimbal 9,10, usually consider that mar proof etc. uses magnetic etc., but the 1st, the 2nd differential ring 11,12 is made by magnet, simultaneously, the 1st, the 2nd gimbal 9,10 is made of magnetic.This occasion can increase the frictional force of rotating shaft 4 and the 1st, the 2nd gimbal 9,10 and the 1st, the 2nd differential ring 11,12 of the reason that becomes radial frictional force, thus can with stop differential frictional force different, make and eliminate action and can stably carry out.

And, in the various embodiments described above, the contact-making surface of the 3rd axial restraint member 7 and each axial restraint member 6,8 and each gimbal 9,10 is even surfaces, but is not limited thereto, shown in Figure 20 and Figure 21 A, 21B, also can on this contact-making surface, form concavo-convex 28 or be processed into waveform.This occasion reduces the frictional force of the 1st, the 2nd gimbal 9,10 and the 3rd axial restraint member 7 and each axial restraint member 6,8, but stabilisation, thereby can realize the action of the 1st, the 2nd stable gimbal 9,10.

In the foregoing description, either party of the 3rd axial restraint member 7 and each axial restraint member 6,8 is directly fixed on rotating shaft 4, but is not limited thereto, and also can be fixed on the member with the rotation of rotating shaft 4 one.Such as, as shown in figure 22, also can form the flange 7a that protrudes towards motor 3 sides in the periphery of the 3rd axial restraint member 7, this flange 7a is fixed on the rotor yoke iron 16 of motor 3.In addition, as shown in figure 23, also can form the flange 7a that protrudes towards the 1st axial restraint member 6 sides, this flange 7a is fixed on the 1st axial restraint member 6 in the periphery of the 3rd axial restraint member 7.Or as shown in figure 24, also columnar supporting member 29 can be arranged on the periphery of the 3rd axial restraint member 7, this supporting member 29 is fixed on the 1st axial restraint member 6 and the 2nd axial restraint member 8 (being rotor yoke iron 16 here).

But, in the various embodiments described above, to lay particular stress on the heart to eliminate mechanism 1 be supporting as the disc that comprises the rotary body that is rotated body 5, but be not limited thereto, the heart of laying particular stress on that can be used as various rotary bodies is eliminated mechanism 1 and is used.

In addition, in order to increase the chain rate of rotating shaft 4 and each gimbal 9,10, also configurable a plurality of differential rings.Such as, the heart of laying particular stress on shown in Figure 1 is eliminated in the mechanism, also can radially connect other differential rings of insertion movably between the 1st differential ring 11 and the 1st gimbal 9.Equally, also can between the 2nd differential ring 12 and the 2nd gimbal 10, radially connect other differential rings of insertion movably.And the number of differential ring is not limited thereto, also configurable a plurality of differential rings.In addition, these a plurality of differential rings also can use with the textural association of 1 differential ring.

Thus, by using a plurality of differential rings, compare with the occasion of 1 differential ring, chain rate increases, and the 1st, the 2nd gimbal 9,10 further lags relatively with respect to rotating shaft 4, can shorten the distance on the direction of advance.

In addition, the size relationship (such as external diameter, internal diameter etc.) of illustrated each the 1st, the 2nd gimbal the 9,10, the 1st, the 2nd differential ring and rotating shaft 4, to put down in writing in order understanding easily among the present invention, but not to be subjected to the influence of size shown in illustrated rotating shaft, gimbal, the differential ring and ratio thereof etc.

Claims (15)

1. the heart of laying particular stress on of a rotary body is eliminated mechanism, is used to eliminate the heart of laying particular stress on of rotary body, it is characterized in that, comprising: rotating shaft; At least 2 gimbals, it is radially embedding in axial separate configuration and with respect to described rotating shaft movably with respect to described rotating shaft; At least 1 differential ring, its be configured in described gimbal each inboard, radially embedding movably with respect to described rotating shaft; The axial restraint member, it rotates with described rotating shaft one, axially contacting with described gimbal and differential ring, giving rotation and to axial mobile the restriction by friction.

2. the heart of laying particular stress on of rotary body as claimed in claim 1 is eliminated mechanism, it is characterized in that, described gimbal is made of 2 the 1st gimbal and the 2nd gimbal, each inboard of the described the 1st and the 2nd gimbal disposes the 1st and the 2nd differential ring, is configured between the group of described the 1st gimbal on 2 axle right-angle planes and differential ring and the 2nd balance and differential ring and the outside has described axial restraint member respectively.

3. the heart of laying particular stress on of rotary body as claimed in claim 1 or 2 is eliminated mechanism, it is characterized in that, has the differential ring restrictions, this differential ring restrictions and the rotation of described rotating shaft one, simultaneously by with the outer peripheral face butt of described differential ring, with the inner peripheral surface of described differential ring and described rotating shaft not the scope of butt described differential ring is limited in radially moving range.

4. the heart of laying particular stress on of rotary body as claimed in claim 3 is eliminated mechanism, it is characterized in that, at least has 1 described differential ring restrictions, at least 1 the court moving range radially of described differential ring is subjected to the restriction of described differential ring restrictions, and other court's moving range radially of described differential ring is limited with the way of contact with described rotating shaft.

5. the heart of laying particular stress on of rotary body as claimed in claim 1 or 2 is eliminated mechanism, it is characterized in that on the face of the described gimbal of rotation being given described axial restraint member, having the protuberance that the described gimbal that will contact with described differential ring advances to give local support.

6. the heart of laying particular stress on of rotary body as claimed in claim 5 is eliminated mechanism, it is characterized in that, forms concavo-convex on described protuberance.

7. the heart of laying particular stress on of rotary body as claimed in claim 1 or 2 is eliminated mechanism, it is characterized in that, has described gimbal is pressed against force application apparatus on the axial restraint member towards axial force distribution and with it.

8. the heart of laying particular stress on of rotary body as claimed in claim 7 is eliminated mechanism, it is characterized in that described force application apparatus is with the leaf spring of described gimbal towards axial force distribution.

9. the heart of laying particular stress on of rotary body as claimed in claim 8 is eliminated mechanism, it is characterized in that, described application of force rotor is to put at least one side of the axial restraint member relative clipping described gimbal, described gimbal is carried out the spring of the application of force towards any the opposing party's axial restraint member.

10. the heart of laying particular stress on of rotary body as claimed in claim 8 is eliminated mechanism, it is characterized in that, described leaf spring has tabular surface with described gimbal butt at central portion, at least 3 spring pins that extend towards circumferencial direction on peripheral part equably configuration form.

11. the heart of laying particular stress on of rotary body as claimed in claim 7 is eliminated mechanism, it is characterized in that described force application apparatus is the elastomer towards axial protrusion.

12. the heart of laying particular stress on of rotary body as claimed in claim 7 is eliminated mechanism, it is characterized in that, described force application apparatus is the magnetic flux that is produced by magnet.

13. a motor is characterized in that, the heart of laying particular stress on claim 1 or 2 described rotary bodies is eliminated mechanism, at the distolateral rotating disk that carries the disc shaped recording medium, described rotating disk double as one side's the described axial restraint member of being embedded with of described rotating shaft.

14. motor as claimed in claim 13 is characterized in that, the rotor yoke iron that the round-ended cylinder shape is arranged that drive magnet has been installed is arranged on the described rotating shaft, bottom double as the opposing party's of this rotor yoke iron described axial restraint member.

15. motor as claimed in claim 14 is characterized in that, is formed with described differential ring restrictions in the bottom of described rotor yoke iron.

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