CN202663220U

CN202663220U - Motor and disc driving device

Info

Publication number: CN202663220U
Application number: CN 201220244178
Authority: CN
Inventors: 市村和哉
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2011-10-20
Filing date: 2012-05-28
Publication date: 2013-01-09
Anticipated expiration: 2022-05-28

Abstract

The utility model relates to a motor and a disc driving device. The motor and the disc driving device are characterized in that a rotating portion is provided with a shaft, a rotor retainer, a chuck mechanism and a rotor magnet. A static portion is provided with a sleeve and a stator. The shaft is provided with a large-diameter portion inserted into the sleeve and a small-diameter portion arranged on the upper portion of the shaft and smaller than the outer diameter of the large-diameter portion. An upper end of the shaft is protruded to a position above the upper end portion of an inner drum portion of the rotor retainer and the upper surface of the chuck mechanism, the small-diameter portion is stacked with an upper end of the inner drum portion radially, and adhesive is arranged in gaps among the inner drum portion, the large-diameter portion and the small-diameter portion. By means of the motor and the disc driving device, the connecting strength of a retaining shaft and the rotor retainer is guaranteed and simultaneously the disc driving device and the motor can be slim and thin.

Description

Motor and disk drive device

Technical field

The utility model relates to a kind of dish removably motor and disk drive device.

Background technology

All the time, be used in play/burn a CD-recording disk drive device of the device of the information-recording disks such as ROM, DVD in, carry the disk drive motor that drives these disc spins.

For example, such as the slim disk drive motor of putting down in writing in the TOHKEMY 2006-196139 communique, comprise that the dish maintaining part of the central portion of the upper surface that is configured in panoramic table, the dish that is configured to freely to advance and retreat keep pawl, extruding disk to keep pawl to make it from the spring section that the peripheral part of dish maintaining part is given prominence to and the dish abutting part that is configured in the peripheral part of dish maintaining part.

When the disk drive device that will carry this slim disk drive motor is equipped on PC etc., need to be with the further slimming of disk drive device.Therefore, be accompanied by the slimming of disk drive device, be equipped on the gap smaller between the top board of the indicator of disk drive motor and disk drive device.Consequently, when being subject to outside impact, the possibility that causes indicator to contact with the top board of disk drive device is arranged.And, have to cause indicator is carried out reading of information or writes the possibility that makes a mistake.Moreover, because indicator contacts with top board, may cause the damage of indicator.

And, being accompanied by the slimming of disk drive motor, all parts that consists of the slimming disk drive motor shortens in axial length.Therefore, the fixed-area of the coupling part between parts reduces, and causes the connection power between parts to reduce.

Particularly because the diameter of axle is little, as between the rotor retainer of the axle of rotating shaft and the outer peripheral face that is fixed on axle to be connected power very little.Therefore and since to motor apply from the impact of outside or loading and unloading dish the time put on the power of the coupling part of axle and rotor retainer, and axle and rotor retainer be connected with occur unstable may.

Summary of the invention

In view of above-mentioned problem, main purpose of the present utility model is, in the bonding strength of retainer shaft and rotor retainer, realizes the slimming of disk drive device and motor.

Exemplified the first utility model of the application relates to a kind of motor that is contained in the housing with top plate portion, and its feature is as follows.Motor comprises stationary part and is supported for can be with respect to the rotating part of stationary part rotation.This rotating part has axle, the rotor retainer, chuck mechanism and rotor magnet, this axle be along the central axis above-below direction extend cylindric, this rotor retainer has the discoid cap of radial extension, the outer cylinder portion cylindraceous of extending towards the below from the radial outer end section of cap and the inner cylindrical section of extending towards the top from the radial inner end of cap, and the inner peripheral surface of this inner cylindrical section is bonded and fixed at the top of axle, this chuck mechanism has the shell of the upper surface that is configured in cap, a plurality of aligning pawls outstanding and that dish is remained a plurality of chuck jaws removably and extends and can contact with the centre bore of dish from shell towards radial outside from shell towards radial outside, this rotor magnet is fixed in the inner peripheral surface of outer cylinder portion.Stationary part have the sleeve cylindraceous that inserts for axle and be positioned at than rotor magnet more by the position of radially inner side and with the stator of rotor magnet diametrically contraposition.Axle has the top that is inserted in the large-diameter portion in the sleeve and is positioned at axle and the minor diameter part less than the external diameter of large-diameter portion.The upper end of axle projects to the position more closer to the top than the upper surface of the upper end of the inner cylindrical section of rotor retainer and chuck mechanism.The upper end of minor diameter part and inner cylindrical section is radially overlapping.There is bonding agent in the gap between inner cylindrical section and large-diameter portion and the minor diameter part.

Exemplified the second utility model of the application relates to a kind of motor that is contained in the housing with top plate portion, and its feature is as follows.Motor comprises stationary part and is supported for can be with respect to the rotating part of stationary part rotation.This rotating part has axle, the rotor retainer, chuck mechanism and rotor magnet, this axle be along the central axis above-below direction extend cylindric, this rotor retainer has the discoid cap of radial extension, the outer cylinder portion cylindraceous of extending towards the below from the radial outer end section of cap and the inner cylindrical section of extending towards the top from the radial inner end of cap, and the inner peripheral surface of this inner cylindrical section is pressed into the top that is fixed on axle, this chuck mechanism has the shell of the upper surface that is configured in cap, a plurality of aligning pawls outstanding and that dish is remained a plurality of chuck jaws removably and extends and can contact with the centre bore of dish from shell towards radial outside from shell towards radial outside, this rotor magnet is fixed in the inner peripheral surface of outer cylinder portion.Stationary part have the sleeve cylindraceous that inserts for large-diameter portion and be positioned at than rotor magnet more by the position of radially inner side and with the stator of rotor magnet diametrically contraposition.Axle has the top that is inserted in the large-diameter portion in the sleeve and is positioned at axle and the minor diameter part less than the external diameter of described large-diameter portion.The upper end of axle projects to the position more closer to the top than the upper surface of the upper end of the inner cylindrical section of rotor retainer and chuck assembly.The upper end of minor diameter part and inner cylindrical section is radially overlapping.

According to the utility model, in the bonding strength of retainer shaft and rotor retainer, can realize the slimming of disk drive device and motor.

Description of drawings

Fig. 1 is the cutaway view of disk drive device.

Fig. 2 is the cutaway view of motor.

Fig. 3 is the plane graph of chuck mechanism.

Fig. 4 is near the cutaway view in top of the related axle of the first execution mode.

Fig. 5 is near the cutaway view in top of the related axle of the second execution mode.

Fig. 6 is near the cutaway view in top of the related axle of the 3rd execution mode.

Fig. 7 is near the cutaway view in top of the related axle of the 4th execution mode.

Symbol description:

1 disk drive device

11 housings

The 11a top plate portion

The 11b resin plate

2 stationary part

21 stationary axle bearing units (sleeve)

3 rotating parts

31 axles

311 large-diameter portions

312 minor diameter parts

The 31a upper recess

The 31b upper end

31c central diameter section

32 rotor retainers

The 32a cap

The 32b outer cylinder portion

The 32c inner cylindrical section

32c4 inner cylinder recess

The 32c5 upper surface

The 32d contact site

34 chuck mechanisms

The 34a shell

The 34a2 depressed part

90 dishes

The J1 central axis

Embodiment

Below, describe with reference to accompanying drawing about the exemplified execution mode of the utility model.In addition, below, with along the direction of the central axis of motor as above-below direction, shape and the position relationship of each several part described.But the above-below direction that this just defines for the convenience that illustrates arranges posture when not limiting the related motor of the utility model and disk drive device and carrying to actual equipment.And, with the direction parallel with central axis as axially, will be centered by central axis radially referred to as radially, will be centered by central axis circumferentially referred to as circumferentially.

(formation of disk drive device)

Fig. 1 is the cutaway view of the related disk drive device 1 of the exemplified a kind of execution mode of the utility model.Disk drive device 1 is for making removably below the CD 90(, referred to as " dish 90 ") carry out the device that reads and write of information when centered by central axis, rotating.As shown in Figure 1, disk drive device 1 comprises housing 11, disk in pallet 12, motor 13 and access section 14.

Housing 11 is the chest shape.Housing 11 has top plate portion 11a.Top plate portion 11a is the parts of the substantially planar of radial extension.Top plate portion 11a is by the formed parts of metal.Housing 11 is contained in its inside with disk in pallet 12, motor 13 and access section 14.Top plate portion 11a is configured in the position more closer to the top than disk in pallet 12, motor 13 and access section 14.Disk in pallet 12 slides mobile between the outside of housing 11 and inside, thus, will coil 90 and move into and take out of.The motor 13 that is contained in housing is fixed in disk in pallet 12.Dish 90 is kept by the rotating part 3 of motor 13, rotates centered by central axis J1 by motor 13.

Access section 14 has a 14a who comprises the light hit detect function.14a is the light mechanism for picking.Access section 14 carries out reading and writing of information along the recording surface slip-on head 14a of the dish 90 that rotates by motor 13.In addition, a 14a of access section 14 also can only carry out to coiling 90 recording surface a side who reads and write of information.

(formation of motor)

Then, the formation of above-mentioned motor 13 described.

Fig. 2 is the cutaway view of motor 13.As shown in Figure 2, motor 13 comprises stationary part 2, rotating part 3, mounting panel 4 and circuit board 5.

Stationary part 2 is fixed in mounting panel 4.Stationary part 2 has stationary axle bearing unit 21, lining 22, board 23, Thurst washer 24, precompressed magnet 25 and stator 26.Stationary axle bearing unit 21 is the sleeve that is formed by sintering metal.Below stationary axle bearing unit 21 is called " sleeve 21 ".At sleeve 21 immersion lubrications oil.Sleeve 21 is parts cylindraceous roughly, is inserted by axle 31 described later.Sleeve 21 back shafts 31 are rotatable.

Lining 22 has the through hole that above-below direction connects.Face at the through hole of regulation lining 22 is pressed into fixed muffle 21.That is, at the internal configurations sleeve 21 of lining 22.The fixed part 22b that lining 22 has lining cylindrical portion 22a and is positioned at lining cylindrical portion 22a below.Lining 22 is the parts that the cut by metal forms.For example, the material of lining 22 is brass or aluminium alloy etc.Lining cylindrical portion 22a is position cylindraceous roughly.The inner peripheral surface of lining cylindrical portion 22a is the face of the through hole of described regulation lining 22.That is, sleeve 21 is pressed into the inner peripheral surface that is fixed to lining cylindrical portion 22a.And, form towards the outstanding flange part 22a1 of radial outside on the top of lining cylindrical portion 22a.Fixed part 22b extends towards radial outside from the position of the downside of lining cylindrical portion 22a.Fixed part 22b form from the lower surface of fixed part 22b towards below outstanding inner process 22b1 and outer process 22b2.Inner process 22b1 is configured in the position of more leaning on radially inner side than outer process 22b2.

Board 23 is the plate-shaped member that is formed by punch process.By chimeric inner process 22b1, the outer edge of board 23 is fixed in lining 22.By board 23 is fixed in lining 22, board 23 obturations are the through hole of sleeve 21 cylindraceous roughly.Board 23 has the board recess 23a towards the below depression.Board recess 23a is configured in the position with the lower surface axial overlap of axle 31.And Thurst washer 24 is configured in the board recess 23a.Thurst washer 24 is by the axial support axle 31 with the lower surface butt of axle 31.

Precompressed magnet 25 is disposed at the upper surface of the rear of core 27b of stator core 27 described later.By precompressed magnet 25 is axially opposed with the cap 32a of rotor retainer 32 described later, between the cap 32a of precompressed magnetite 25 and rotor retainer 32, produce the magnetism attraction.

Stator 26 comprises the stator core 27 with a plurality of tooth 27a of section and the coil 28 that is wound in each 27a of tooth section.Stator core 27 also has roughly circular rear of core 27b.Rear of core 27b is fixed in the fixed part 22b of lining 22.The 27a of tooth section extends towards radial outside from rear of core 27b.A plurality of tooth 27a of section are uniformly-spaced configuration circumferentially.The upper surface of the bottom of coil 28 and circuit board 5 is opposed across small gap.

Rotating part 3 is supported for can be with respect to stationary part 2 rotations.Rotating part 3 comprises axle 31, rotor retainer 32, rotor magnet 33, chuck mechanism 34 and the anti-parts 36 that pull out.Axle 31 is the roughly columned parts that extend along central axis J1 above-below direction.The parts of rotor retainer 32 for being fixed in axle 31 and rotating with axle 31.The upper end 31b of axle 31 projects to the position more closer to the top than rotor retainer 31 and chuck mechanism 34.Rotor retainer 32 is formed through punch process by thin plate.In the present embodiment, thin plate is formed by magnetic.Rotor magnet 33 is fixed in rotor retainer 32.It is roughly circular that rotor magnet 33 is.The inner peripheral surface of rotor magnet 33 becomes end-face diameter with the 27a of tooth section of stator core 27 to opposed magnetic pole strength.That is, stator 26 is positioned at than rotor magnet 33 more by the position of radially inner side, and with rotor magnet 33 diametrically contrapositions.

Rotor retainer 32 comprises cap 32a, outer cylinder portion 32b and inner cylindrical section 32c.Cap 32a is the discoid position of radial extension.Upper surface at cap 32a disposes shell 34a described later.Outer cylinder portion 32b is the position cylindraceous of extending towards the below from the radial outer end section of cap 32a.Rotor magnet 33 is maintained at the inner peripheral surface of outer cylinder portion 32b.Inner cylindrical section 32c is the position of extending towards the top from the radial inner end of cap 32a.The bonded top of being fixed in axle 31 of the inner peripheral surface of inner cylindrical section 32.

The upper surface of the bottom of the bottom of outer cylinder portion 32b and rotor magnet 33 and circuit board 5 is opposed across small gap.

Roughly circular mounting parts 35 are fixed in the upper surface of rotor retainer 32.Dish 90 so that its lower surface be positioned on the cap 32a with the state that the upper surface that loads parts 35 contacts.And the interior perimembranous of dish 90 is held in chuck mechanism 34.That is, rotor retainer 32, mounting parts 35 and chuck mechanism 34 consist of the maintaining part of holding tray 90.

Coil 28 to stationary part 2 provides drive current, and then a plurality of tooth 27a of section in stator core 27 produce magnetic flux.And, producing circumferential torque by the effect of the magnetic flux between the 27a of tooth section and the rotor magnet 33, rotating part 3 rotates centered by central axis J1 with respect to stationary part 2.The dish 90 that is held in rotating part 3 rotates centered by central axis J1 with rotating part 3.

Mounting panel 4 is the tabular parts that formed by punch process.Mounting panel 4 supported in rest sections 2 and circuit board 5.Mounting panel 4 is fixed in the disk in pallet 12 of disk drive device 1.That is, motor 13 is installed on disk in pallet 12.And by chimeric, motor 13 is fixed in mounting panel 4 by outer process 22b2.The height and position of stationary part 2, rotating part 3 and circuit board 5 is set take the upper surface of mounting panel 4 as benchmark.Mounting panel 4 is formed by the material higher than the rigidity of circuit board 5.For example, mounting panel 4 is formed by metals such as aluminium alloys.

Circuit board 5 is disposed at the upper surface side of mounting panel 4.Be used for control provides control circuit from drive current to the coil 28 of stationary part 2 in circuit board 5 assemblings.

Fig. 3 is the plane graph of chuck mechanism 34.Chuck mechanism 34 has shell 34a, a plurality of chuck jaw 34b, a plurality of elastomeric element 34c and a plurality of aligning pawl 34d.Shell 34a is disposed at the upper surface of cap 32a.Shell 34a is formed by resin.Shell 34a is the roughly discoid parts centered by central axis J1.Shell 34a is inserted into the centre bore of dish 90.

A plurality of chuck jaw 34b and a plurality of elastomeric element 34c are contained in the inside of shell 34a.Elastomeric element 34c is configured in the radially inner side of chuck jaw 34b.Chuck jaw 34b is pushed to radial outside by elastomeric element 34c.In the present embodiment, elastomeric element 34c adopts helical spring, but can not be helical spring also.For example, also can be the elastomeric elements such as rubber.

Chuck jaw 34b is outstanding from shell 34a to radial outside.Chuck jaw 34b will coil 90 and remain and can load and unload by the upper edge of the face of the centre bore of extruding regulation dish 90.The outer peripheral face of shell 34a has a plurality of notch 34a1.Notch 34a1 forms by the outer peripheral face that cuts shell 34a.In the present embodiment, the number of notch 34a1 is three, circumferentially uniformly-spaced configuration.The number of notch 34a1 also can need not to be three.The radial outside of the front end of chuck jaw 34b from notch 34a1 to shell 34a is outstanding.In the present embodiment, the number of elastomeric element 34c and chuck jaw 34b is respectively three.The number of elastomeric element 34c and chuck jaw 34b also can need not to be three.34a1 is the same with notch, and elastomeric element 34c and chuck jaw 34b are respectively in circumferentially uniformly-spaced configuration.

And a plurality of aligning pawl 34d and shell 34a are integrally formed.Aligning pawl 34d extends towards radial outside from shell 34a.Aligning pawl 34d can contact with the centre bore of dish 90.Carry out aligning so that the center of shell 34 is consistent with the center of the centre bore of dish 90 by aligning pawl 34d with the centre bore contact of dish 90.In the present embodiment, the number of aligning pawl 34d is three, in circumferentially uniformly-spaced configuration.The number of aligning pawl 34d also can need not to be three.

As shown in Figure 2, prevent pulling out the lower surface that parts 36 are fixed in cap 32a.The anti-parts 36 that pull out have a plurality of jut 36a that extend towards the below and a plurality of anti-pusher dog 36b of section that extends towards radially inner side from the lower end of jut 36a.Jut 36a is positioned at the position of more leaning on radial outside than flange part 22a1.And jut 36a extends to the position more on the lower than flange part 22a1.The inner edge portion of the anti-36b of pusher dog section is positioned at the position more on the lower than flange part 22a1, and with flange part 22a1 at axial overlap.If rotating part 3 is moved upward, then jut 36a contacts with flange part 22a1.Thus, limited rotating part 3 movement vertically.

(near the top of the axle that the first execution mode is related)

Fig. 4 is near the cutaway view in top of the related axle of the first execution mode 31.The upper recess 31a of the ring-type centered by central axis is set on the top of axle 31.Upper recess 31a caves in towards radially inner side from the outer peripheral face of axle 31.In the present embodiment, upper recess 31a extends to the upper end 31b of axle 31.That is, axle 31 has roughly columned large-diameter portion 311 and the roughly columned minor diameter part 312 less than the external diameter of large-diameter portion 311.Large-diameter portion 311 is inserted in the sleeve 21.Minor diameter part 312 is positioned at the top of axle 31.Minor diameter part 312 is configured in the upside of large-diameter portion 311.Namely, upper recess 31a is made of outer peripheral face and the step surface 37 between large-diameter portion 311 and minor diameter part 312 of minor diameter part 312.Therefore, the face towards radial outside of upper recess 31a is equivalent to the outer peripheral face of minor diameter part 312.In the present embodiment, minor diameter part 312 extends to upper end 31b.That is, upper end 31b is positioned at the upside of minor diameter part 311.

Minor diameter part 312 is radially overlapping with the upper end of inner cylindrical section 32c.The inner peripheral surface bonding of inner cylindrical section 32c is fixed to the top of axle 31.That is, there is bonding agent 40 in the gap between the outer peripheral face of the inner peripheral surface of inner cylindrical section 32c and axle 31.In more detail, the inner peripheral surface of inner cylindrical section 32c and and the outer peripheral face of the opposed large-diameter portion 311 of inner cylindrical section 32c and minor diameter part 312 between the gap in have bonding agent 40.

And upper end 31b is positioned at the position of more leaning on axial upside than the upper end of inner cylindrical section 32c.That is, the upper end of upper end 31b and inner cylindrical section 32c is not radially overlapping.

Inner cylindrical section 32c has from the inner cylinder recess 32c4 of inner peripheral surface towards the ring-type of radial outside depression.

The face towards the top of upper recess 31a, that is, the step surface 37 between large-diameter portion 311 and the minor diameter part 312, the face towards the top that is positioned at than inner cylinder recess 32c4 more leans on the axially position of top.That is, the lower end part of inner cylinder recess 32c4 more leans on the axially position of below in the bottom than minor diameter part 312.And the upper-end part of driving of inner cylinder recess 32c4 more leans on the axially position of top in the bottom than minor diameter part 312.Also there is bonding agent 40 in the inside of inner cylinder recess 32c4.

Thus, in the gap of the outer peripheral face of the inner peripheral surface of the inner cylinder recess 32c4 that locates more on the lower than the bottom of minor diameter part 312 and axle 31, that is, in the gap of the inner peripheral surface of inner cylinder recess 32c4 and the outer peripheral face of large-diameter portion 311, the volume of the bonding agent 40 of existence can become large.Consequently, in the rigidity of retainer shaft 31, can more improve the bonding strength of axle 31 and rotor retainer 32.

Rotor retainer 32 is being fixed in the operation of axle 31, is making rotor retainer 32 that inner peripheral surface at inner cylindrical section 32c has been coated with bonding agent 40 mobile above the axle 31 downwards.Thus, the top of axle 31 is inserted into rotor retainer 32.In addition, bonding agent 40 is to be coated with by coating machine.Because minor diameter part 312 extends to the upper end 31b of axle, when being inserted into the rotor retainer on the top of axle 31, can prevent that bonding agent 40 is attached to the upper end 31b of axle 31.The upper end 31b of axle 31 projects to the upper surface position closer to the top than the shell 34a of the upper end of the inner cylindrical section 32c of rotor retainer 32 and chuck mechanism 34.

At the tabular resin plate 11b of the opposed position configuration of lower surface and upper end 31b axle 31 of top plate portion 11a.That is, the upper surface of axle 31 and resin plate 11b are at axial overlap.Resin plate 11b is the parts that formed by resin.

Because the upper end 31b of axle 31 projects to than the upper end of inner cylindrical section 32c and the upper surface position closer to the top of shell 34a, even disk drive device 1 is subject to outside impact, the upper end 31b of axle 31 and resin plate 11b butt can prevent from coiling 90 and contact with top plate portion 11a.Consequently, can prevent coiling the mistake that reads or write of 90 information.And, also can prevent from contacting with top plate portion 11a owing to dish 90 damage of the dish 90 that causes.And, contact with top board 11a owing to can prevent from coiling 90, can will coil the gap smaller of the lower surface of 90 upper surface and top plate portion 11a.Consequently, can realize the slimming of disk drive device 1.

And, because resin plate 11b is formed by resin, compare with the situation of top plate portion 11a butt with axle 31, can suppress the generation of noise.

The inner peripheral surface bonding of inner cylindrical section 32c is fixed in the top of axle 31.Be specially, the outer peripheral face of the inner peripheral surface of inner cylindrical section 32c and axle 31 is opposed across the gap.And, have bonding agent 40 in the gap of the outer peripheral face of the inner peripheral surface of inner cylindrical section 32c and axle 31.That is, the inner peripheral surface of inner cylindrical section 32c and and the outer peripheral face of the opposed large-diameter portion 311 of inner cylindrical section 32c and minor diameter part 312 between the gap in have bonding agent 40.

In the present embodiment, not only in the gap of the outer peripheral face of the inner peripheral surface of inner cylindrical section 32c and large-diameter portion 311, in the gap of the outer peripheral face of the inner peripheral surface of inner cylindrical section 32c and minor diameter part 312, also there is bonding agent 40.That is, not only axially, radially also can enlarge bonded areas.Consequently, can improve the bonding strength of axle 31 and rotor retainer 32.

The inner peripheral surface 32c1 of the upper end of inner cylindrical section 32c is along with tilting to radial outside towards the top.That is, the internal diameter of the upper end of inner cylindrical section 32c is along with becoming gradually large towards the top.Thus, can increase the volume of retainable bonding agent 40 between minor diameter part 312 and the inner cylindrical section 32c.Consequently, can more improve the bonding strength of axle 31 and rotor retainer 32.

And the inner peripheral surface of the shell 34a of chuck mechanism 34 is pressed into the outer peripheral face that is fixed to inner cylindrical section 32c.When the inner peripheral surface of inner cylindrical section 32c is pressed into the top that is fixed to axle 31, inner cylindrical section 32c distortion is arranged, inner cylindrical section 32c may towards the radial outside projection.Thus, when shell 34a is pressed into to inner cylindrical section 32c, the possibility that causes shell 34a to break is arranged.In the present embodiment, because the top of the inner peripheral surface of inner cylindrical section 32c and axle 31 bonding is fixing, can prevent the distortion of inner cylindrical section 32c.Therefore, can accurately shell 34a be pressed into to inner cylindrical section 32c.Consequently, when being pressed into shell 34a to inner cylindrical section 32c, can prevent that shell 34a from breaking.

The radial inner end of the upper surface of shell 34a have towards below the depressed part 34a2 of roughly ring-type of depression.That is, depressed part 34a2 is also referred to as the recess of roughly ring-type of the upper end of the inner peripheral surface that is formed at shell 34a.The lower surface of depressed part 34a2 is positioned at the position more on the lower, upper surface than inner cylindrical section 32c.Thus, even bonding agent 40 flows out to the position of more leaning on radial outside than inner cylindrical section 32c, also can keep bonding agent 40 at depressed part 34a2, thereby can prevent that bonding agent 40 is attached to the upper surface of shell 34a.

And the outer peripheral face 32c2 of the upper end of inner cylindrical section 32c is along with tilting to radially inner side towards the top.That is, the external diameter of the upper end of inner cylindrical section 32c is along with diminishing gradually towards the top.Thus, can increase the volume of the retainable bonding agent 40 of recess 34a2.

More than, in the present embodiment, in the bonding strength of retainer shaft 31 and rotor retainer 32, can realize the slimming of disk drive device 1 and motor 13.

(near the top of the axle that the second execution mode is related)

Fig. 5 is near the cutaway view in top of the related axle of the second execution mode 31.On the top of axle 31 upper recess 31a is set.Upper recess 31a caves in towards radially inner side from the outer peripheral face of axle 31.In the present embodiment, the top of axle 31 has the central diameter section 31c larger than the external diameter of upper recess 31a in the position than the more top side of upper recess 31a.The outer peripheral face at the position except upper recess 31a of the outer diameter ratio shaft 31 of the 31c of central diameter section is little.That is, in the present embodiment, axle 31 has columned large-diameter portion 311 roughly, than the little roughly columned minor diameter part 312 of the external diameter of large-diameter portion 311 and the central diameter section 31c less and larger than the external diameter of minor diameter part 312 than the external diameter of large-diameter portion 311.Large-diameter portion 311 is inserted into sleeve 21.Minor diameter part 312 and the 31c of central diameter section are positioned at the top of axle 31.Minor diameter part 312 is configured in the upside of large-diameter portion 311.The 31c of central diameter section is configured in the upside of minor diameter part 312.Upper recess 31a is made of outer peripheral face and the step surface 38 between minor diameter part 312 and the 31c of central diameter section at the step surface 37 between large-diameter portion 311 and the minor diameter part 312, minor diameter part 312.The 31c of central diameter section extends to upper end 31b.

Minor diameter part 312 is radially overlapping with the upper end of inner cylindrical section 32c.The inner peripheral surface bonding of inner cylindrical section 32c is fixed to the top of axle 31.Thus, when the top of axle 31 was inserted into rotor retainer 32, the bonding agent 40 that can prevent from being coated on the inner peripheral surface of inner cylindrical section 32c was attached to the upper end 31b of axle 31.

The upper end 31b of axle 31 projects to the upper surface position closer to the top than the shell 34a of the upper end of the inner cylindrical section 32c of rotor retainer 32 and chuck mechanism 34.Thus, even disk drive device 1 is subject to the impact from the outside, the upper end 31b of axle 31 and resin plate 11b butt can prevent from coiling 90 and contact with top plate portion 11a.Consequently, can prevent coiling reading or write and making a mistake of 90 information.And, can prevent from damaging owing to dish 90 and contacting of top plate portion 11a cause coiling 90.And, contact with top plate portion 11a owing to can prevent from coiling 90, can will coil the gap smaller of the lower surface of 90 upper surface and top plate portion 11a.Consequently, can realize the slimming of disk drive device.

The inner peripheral surface bonding of inner cylindrical section 32c is fixed to the top of axle 31.Be specially, the outer peripheral face of the inner peripheral surface of inner cylindrical section 32c and axle 31 is opposed across the gap.And, have bonding agent 40 in the gap of the outer peripheral face of the inner peripheral surface of inner cylindrical section 32c and axle 31.That is, the inner peripheral surface of inner cylindrical section 32c and and the outer peripheral face of the opposed large-diameter portion 311 of inner cylindrical section 32c and minor diameter part 312 between the gap in have bonding agent 40.Therefore, not only axially, radially also can enlarge bonded areas.Consequently, can improve the bonding strength of axle 31 and rotor retainer 32.

(near the top of the axle that the 3rd execution mode is related)

Fig. 6 is near the cutaway view in top of the related axle of the 3rd execution mode 31.On the top of axle 31 upper recess 31a is set.Upper recess 31a caves in towards radially inner side from the outer peripheral face of axle 31.In the present embodiment, upper recess 31a extends to the upper end 31b of axle 31.That is, axle 31 has roughly columned large-diameter portion 311 and the roughly columned minor diameter part 312 less than the external diameter of large-diameter portion 311.Large-diameter portion 311 is inserted into sleeve 21.Minor diameter part 312 is positioned at the top of axle 31.Minor diameter part 312 is configured in the upside of large-diameter portion 311.The face towards radial outside of upper recess 31a is equivalent to the outer peripheral face of minor diameter part 312.In the present embodiment, minor diameter part 312 extends to upper end 31b.

The upper end of minor diameter part 312 and inner cylindrical section 32c is radially overlapping.In the present embodiment, the inner peripheral surface of inner cylindrical section 32c is pressed into the top that is fixed to axle 31.The upper end 32c3 of inner cylindrical section 32c, along with tilting to radially inner side towards the top, and the step surface 37 between large-diameter portion 311 and minor diameter part 312 is at axial overlap.

Rotor retainer 32 is being fixed in the operation of axle 31, is making rotor retainer 32 mobile from the top of axle 31 downwards.Thus, the top of axle 31 is pressed into to rotor retainer 32.Because the inner peripheral surface of inner cylindrical section 32c by being pressed into the top that is fixed to axle 31, can be improved the bonding strength of axle 31 and rotor retainer 32.And, because the upper end 32c3 of inner cylindrical section 32c and step surface 37 axial overlaps between large-diameter portion 311 and minor diameter part 312, so can improve bonding strength with respect to the axle 31 for the load of downside and rotor retainer 31.

In addition, the upper end 31b of axle 31 projects to the upper surface position closer to the top than the shell 34a of the upper end 32c3 of the inner cylindrical section 32c of rotor retainer 32 and chuck mechanism 34.At the tabular resin plate 11b of the opposed position configuration of lower surface and upper end 31b axle 31 of top plate portion 11a.Thus, even disk drive device 1 is subject to the impact from the outside, the upper end 31b of axle 31 and resin plate 11b butt can prevent from coiling 90 and contact with top plate portion 11a.And, since can prevent from coiling 90 with the contacting of top plate portion 11a, can will coil the gap smaller of the lower surface of 90 upper surface and top plate portion 11a.Consequently, can realize the slimming of disk drive device.

(near the top of the axle that the 4th execution mode is related)

Fig. 7 is near the cutaway view in top of the related axle of the 4th execution mode 31.In the present embodiment, minor diameter part 312 extends to upper end 31b.

Inner cylindrical section 32c has the contact site 32d that contacts with large-diameter portion 311 than inner cylinder recess 32c4 position more on the lower.By rotor retainer 32 is contacted with axle 31, rotor retainer 32 entrained static can be passed through axle 31 ground connection.

And the inner peripheral surface of the shell 34a of chuck mechanism 34 is pressed into the outer peripheral face that is fixed to inner cylindrical section 32c.Inner peripheral surface and the contact site 32d of shell 34a that is pressed into the outer peripheral face that is fixed to inner cylindrical section 32c is radially overlapping.Consequently, can reduce the crooked of the contact site 32d that caused by being pressed into of shell 34a.

In the present embodiment, upper end 31b is positioned at the position of more leaning on axial upside than the upper end of inner cylindrical section 32c.Therefore, can suppress the bonding agent 40 climing upper surfaces to axle 31 that exist in the gap of outer peripheral face of the inner peripheral surface of inner cylindrical section 32c and axle 31.

And the lower end part of inner cylinder recess 32c4 more leans on the axially position of below in the bottom than minor diameter part 312.Thus, in the rigidity of retainer shaft 31, can improve the bonding strength of axle 31 and rotor retainer 32.

And in the present embodiment, the upper-end part of driving of inner cylinder recess 32c4 more leans on the axially position of top in the bottom than minor diameter part 312.Therefore, can increase the amount of the bonding agent 40 in the gap of the inner peripheral surface that can remain on inner cylindrical section 32c and minor diameter part 312, and can prevent effectively that bonding agent 40 is attached to the upper surface of axle 31.

The upper end of inner cylinder recess 32c4 and step surface 37 axial overlaps between large-diameter portion 311 and minor diameter part 312.And the upper end of inner cylinder recess 32c4 and the step surface 37 between large-diameter portion 311 and minor diameter part 312 are opposed across the gap.Thus, till bonding agent 40 sclerosis, can easily adjust the position of 32 of axle 31 and rotor retainers.

More than, the exemplified execution mode of the utility model is illustrated, but the utility model is not limited to above-mentioned execution mode.

In the above-mentioned execution mode, lining 22 is by the formed parts of the cut of metal, also can be formed by punch process.In this case, lining 22 and board 23 can be integrated parts.

In the above-mentioned execution mode, by jut 36a is contacted with flange part 22a1, the movement vertically of restricting rotation section 3, but also can by the movement vertically of other means restricting rotation sections 3.For example, the roughly notch of ring-type is set in the bottom of axle 31, and has the roughly discoid resin component of the through hole less and larger than the external diameter of notch than the external diameter of axle 31 in the downside configuration of sleeve 21.And the notch by axle 31 contacts the movement vertically of restricting rotation section 3 with around the through hole of resin component.

The formation that above-mentioned execution mode is mentioned only can appropriate combination otherwise conflict.

The utility model can be used in motor and disk drive device.

Claims

1. motor, it can be contained in the housing with top plate portion, it is characterized in that,

Comprise:

Stationary part;

Rotating part, it is supported for and can rotates with respect to described stationary part,

Described rotating part comprises:

Axle, it extends along the central axis above-below direction, and is cylindric;

The rotor retainer, the outer cylinder portion cylindraceous that it has the discoid cap of radial extension, extend towards the below from the radial outer end section of described cap and the inner cylindrical section of extending towards the top from the radial inner end of described cap, the inner peripheral surface of described inner cylindrical section is bonded and fixed at the top of described axle;

Chuck mechanism, it has the shell of the upper surface that is disposed at described cap, a plurality of aligning pawls outstanding and that dish is remained a plurality of chuck jaws removably and extends and can contact with the centre bore of described dish from described shell to radial outside from described shell to radial outside;

Rotor magnet, it is fixed in the inner peripheral surface of described outer cylinder portion,

Described stationary part have the sleeve cylindraceous that inserts for described axle and be positioned at than described rotor magnet more by the position of radially inner side and with the stator of described rotor magnet diametrically contraposition,

Described axle has the large-diameter portion that is inserted in described sleeve and is positioned at the top of described axle and the minor diameter part less than the external diameter of described large-diameter portion,

The upper end of described axle projects to the position more closer to the top than the upper surface of the upper end of the described inner cylindrical section of described rotor retainer and described chuck mechanism,

The upper end of described minor diameter part and described inner cylindrical section is radially overlapping,

There is bonding agent in the gap of described inner cylindrical section and described large-diameter portion and described minor diameter part.

2. motor according to claim 1 is characterized in that,

Described minor diameter part extends to the upper end of described axle.

3. motor according to claim 2 is characterized in that,

Described inner cylindrical section has from the inner cylinder recess of inner peripheral surface towards the ring-type of radial outside depression,

The lower end part of described inner cylinder recess more leans on the axially position of below in the bottom than described minor diameter part.

4. motor according to claim 3 is characterized in that,

The upper-end part of driving of described inner cylinder recess more leans on the axially position of top in the bottom than described minor diameter part.

5. motor according to claim 4 is characterized in that,

Described inner cylindrical section has the contact site that contacts with described large-diameter portion than described inner cylinder recess position more on the lower.

6. motor according to claim 1 is characterized in that,

The inner peripheral surface of the upper end of described inner cylindrical section is along with tilting to radial outside towards the top.

7. motor according to claim 1 is characterized in that,

The inner peripheral surface of described shell is fixed in the outer peripheral face of described inner cylindrical section,

The radial inner end of the upper surface of described shell has the depressed part towards the below depression,

The lower surface of described depressed part is positioned at the position more on the lower, upper surface than described inner cylindrical section.

8. motor according to claim 7 is characterized in that,

The outer peripheral face of the upper end of described inner cylindrical section is along with tilting to radially inner side towards the top.

9. motor according to claim 1 is characterized in that,

The inner peripheral surface of described shell is pressed into the outer peripheral face that is fixed on described inner cylindrical section.

10. motor according to claim 1 is characterized in that,

That described axle has is larger than the external diameter of described minor diameter part, than the little central diameter section of the external diameter of described large-diameter portion,

Described central diameter section is positioned at the upside of described minor diameter part.

11. a disk drive device is characterized in that,

Comprise:

Each described motor in the claim 1 to 10;

To described dish carry out reading of information and write at least one party's access section;

Have the top plate portion that is configured in the position more closer to the top than described motor and described motor and described access section are contained in wherein housing.

12. disk drive device according to claim 11 is characterized in that,

At described top plate portion and opposed position, upper surface described axle, the tabular resin plate that configuration is formed by resin.

13. a motor, it can be contained in the housing with top plate portion, it is characterized in that,

Comprise:

Stationary part;

Described rotating part comprises:

The rotor retainer, the outer cylinder portion cylindraceous that it has the discoid cap of radial extension, extend towards the below from the radial outer end section of described cap and the inner cylindrical section of extending towards the top from the radial inner end of described cap, the inner peripheral surface of described inner cylindrical section is pressed into the top that is fixed on described axle;

Chuck mechanism, it has the shell of the upper surface that is disposed at described cap, a plurality of aligning pawls outstanding and that dish is remained a plurality of chuck jaws removably and extends and can contact with the centre bore of described dish towards radial outside from described shell from described shell to radial outside;

Described stationary part have the sleeve cylindraceous that inserts for described large-diameter portion and be positioned at than described rotor magnet more by the position of radially inner side and with the stator of described rotor magnet diametrically contraposition,

The upper end of described minor diameter part and described inner cylindrical section is radially overlapping.

14. motor according to claim 13 is characterized in that,

The upper end of described inner cylindrical section is along with tilting to radially inner side towards the top, and and the step surface axial overlap between described large-diameter portion and described minor diameter part.

15. a disk drive device is characterized in that,

Comprise:

According to claim 13 or 14 described motors;

16. the disk drive device of putting down in writing according to claim 15 is characterized in that,