CN204392057U - Motor - Google Patents

Abstract

A kind of motor, even if this motor creates towards the situation of the direction movement be separated at rotating shaft and parts of bearings, also can suppress rotor to produce the situation that cannot rotate.In motor, interval between the outer peripheral face (3c) of magnet and the inner peripheral surface (10c) of stator is being set to G, the radius of spheroid is set to r, the angle that the central axis (Ls) of rotating shaft and the conical surface (2h) are formed is set to θ, when distance between the opening edge of the conical surface (2h) and the central axis (Ls) of rotating shaft is set to R, movable distance d, radius r, interval G, angle θ and distance R satisfies the following conditional expression 1 and conditional 2, conditional 1:R > rcos θ+dtan θ, conditional 2:G > dtan θ.Therefore, even if parts of bearings (7) tilts towards output opposition side (L2) displacement, rotating shaft, spheroid also can not leave the conical surface (2h), and magnet also can not be adsorbed onto stator.

Description

Motor

Technical field

The utility model relates to a kind of motor, and this motor exerts a force towards the direction making rotating shaft and parts of bearings mutually close.

Background technology

As the motor being used in the optical take-up apparatus such as CD, DVD player or the movement such as set of lenses for camera, and known a kind of stepper motor.

As shown in Fig. 4 (a), this motor comprises: rotor 4, and described rotor 4 has rotating shaft 2 and is fixed on the magnet 3 of outer peripheral face 2c of rotating shaft 2; And stator 10, described stator 10 is opposed with the outer peripheral face 3c of magnet 3 in tubular.And, when the end 2e of the output opposition side L2 of parts of bearings 7 supporting rotating shaft 2 by being made up of sliding bearing, be provided with retainer 8 and plate-shaped member 9, described retainer 8 is in tubular and supported by parts of bearings 7 as moving along motor axis L0 direction, and described plate-shaped member 9 has the plate spring part 95 (force application part) exerted a force towards the outlet side L1 of rotating shaft 2 by parts of bearings 7.Further, between parts of bearings 7 and the end 2e of rotating shaft 2, be configured with spheroid 6, be formed in parts of bearings 7 towards outlet side L1 opening and the bearing side recess 72 of bearing balls 6.Further, be formed with cross section at the end 2e of rotating shaft 2 and be in the shape of the letter V the rotation shaft side recess 2f of shape, described rotation shaft side recess 2f towards output opposition side L2 opening and bearing balls 6 (with reference to patent documentation 1).

Patent documentation 1: Japanese Unexamined Patent Publication 2012-196030 publication

In the motor adopting parts of bearings 7 (sliding bearing), the rotating shaft 2 deposited in left-hand tools applies impact and cause applying towards the situation of the load exporting opposition side L2 rotating shaft 2.Further, when being formed with driving screw on rotating shaft 2, there is the radial side pressure owing to being applied to rotating shaft 2 and causing applying towards the situation of the load exporting opposition side L2 rotating shaft 2.And, even if in the process of motor 1 stopping, also existing and apply to impact to rotating shaft 2 and cause applying towards the situation of the load exporting opposition side L2 rotating shaft 2.If apply this load and make parts of bearings 7 be shifted towards output opposition side L2, then can remove the state that rotating shaft 2 is supported by parts of bearings 7 by spheroid 6, and rotating shaft 2 can produce this displacement that the central axis Ls of rotating shaft 2 and motor axis L0 direction tilt.Now, as shown in Fig. 4 (b), when having gap between the outer peripheral face 3c and the inner peripheral surface 10c of stator 10 of magnet 3, rotating shaft 2 can rotate, and when the load being applied to rotating shaft 2 disappears, can return to the state shown in Fig. 4 (a).But, as shown in Fig. 4 (c), if the outer peripheral face 3c of magnet 3 contacts with the inner peripheral surface 10c of stator 10, then magnet 3 can be adsorbed onto stator 10, thus cause rotating shaft 2 to rotate, even and if when the load being applied to rotating shaft 2 disappears, also the state shown in Fig. 4 (a) can not be returned to.In order to prevent this bad phenomenon, as long as be arranged to enough greatly by the interval G between the outer peripheral face 3c of the magnet 3 and inner peripheral surface 10c of stator 10, but the characteristic that can produce the motors such as torque reduction in this case reduces.

Utility model content

In view of the above problems, problem of the present utility model is to provide a kind of motor, and this motor, when rotating shaft and parts of bearings produce this situation towards the direction movement be separated, also can suppress rotor to produce the situation that cannot rotate.

In order to solve the motor that above-mentioned problem provides involved by the utility model, it is characterized in that, this motor comprises: rotor, described rotor has rotating shaft and magnet, be formed with cross section to be in the shape of the letter V the rotation shaft side recess of shape in the end of the output opposition side of described rotating shaft, described magnet is fixed on the outer peripheral face of described rotating shaft, stator, described stator is tubular and opposed with the outer peripheral face of described magnet at radial outside, export opposition side bearing portion, described output opposition side bearing portion has spheroid and parts of bearings, and described spheroid abuts with the conical surface of described rotation shaft side recess, described parts of bearings by described sphere supports between described parts of bearings and the described conical surface, force application part, described force application part applies the active force of the first direction that described rotating shaft is contacted with described spheroid to the side component in described rotating shaft and described parts of bearings, and stopper section, the described side component of described stopper section restriction moves towards the second direction of side opposite to the first direction, the movable distance towards described second direction of a described side component is being set to d, the radius of described spheroid is set to r, interval between the outer peripheral face of described magnet and described stator is set to G, the angle that the central axis of described rotating shaft and the described conical surface are formed is set to θ, when distance between the opening edge of the described conical surface and the central axis of described rotating shaft is set to R, described movable distance d, described radius r, described interval G, described angle θ and described distance R satisfies the following conditional expression 1 and conditional 2, namely

Conditional 1:R > rcos θ+dtan θ;

Conditional 2:G > dtan θ.

In the utility model, distance R between the opening edge of the angle θ that the movable distance d towards second direction of one side component, the radius r of spheroid, the central axis of rotating shaft and the conical surface are formed and the conical surface and the central axis of rotating shaft meets the following conditions, conditional 1:R > rcos θ+dtan θ.Therefore, even if when a side component moves ultimate range (movable distance d) towards second direction, the conical surface and spheroid also can contact.

Further, the angle θ that the central axis of the movable distance d towards second direction of a side component, interval G between the outer peripheral face of magnet and stator and rotating shaft and the conical surface are formed meets the following conditions, conditional 2:G > dtan θ.Therefore, even if when a side component towards second direction move ultimate range (movable distance d) and rotor is shifted towards the direction orthogonal with motor axis, also can there is gap between the outer peripheral face of magnet and stator, thus can prevent the magnet of rotor and stator from adsorbing.

Therefore, even if rotating shaft tilts rotor also can be suppressed to produce the situation that cannot rotate.Further, when the load being applied to rotating shaft disappears, original state can be returned to.Further, if meet above-mentioned conditional 1,2, then rotor can be suppressed to produce the situation that cannot rotate, therefore need not interval between the excessive enlargement setting outer peripheral face of magnet and stator inner peripheral surface.

Following this structure can be adopted: a described side component is described parts of bearings in the utility model, described output opposition side bearing portion has retainer, described retainer has the supporting of described parts of bearings for can the through hole of movement in the axial direction, described parts of bearings exerts a force towards the outlet side as described first direction by described force application part, and described stopper section limits described parts of bearings and moves towards the output opposition side as described second direction.

In this case, preferred described force application part abuts with the position of departing from from core to radial direction of described parts of bearings.According to this structure, the state that parts of bearings is formed as tilting a little and contacts with the inner peripheral surface of retainer.Therefore, it is possible to prevent parts of bearings from rocking in the inner side (in through hole) of retainer.

In the utility model, preferred described movable distance d is 1.5 times of described interval G to 1.6 times.According to this structure, when the angle θ central axis of rotating shaft and the conical surface formed is set in about 30 °, can interval G between the outer peripheral face of excessive enlargement magnet and stator.Therefore, it is possible to obtain larger torque in motor.

In the utility model, the angle θ that the central axis of preferred described rotating shaft and the described conical surface are formed is less than 45 °.According to this structure, can interval G between the outer peripheral face of excessive enlargement magnet and stator.

Utility model effect

In the motor involved by the utility model, even if ultimate range is moved in the direction that the side component in rotating shaft and parts of bearings separates toward each other, condition and the outer peripheral face that can prevent magnet that the conical surface contacts with spheroid and the condition that stator adsorbs also can be met.Therefore, even if rotating shaft tilts, rotor also can be suppressed to produce the situation that cannot rotate, therefore need not set interval between the outer peripheral face of magnet and the inner peripheral surface of stator by excessive enlargement.Further, when the load being applied to rotating shaft disappears, original state can be returned to.

Accompanying drawing explanation

Fig. 1 (a), Fig. 1 (b) are the partial sectional view applying motor of the present utility model.

The key diagram of the output opposition side bearing portion that Fig. 2 (a), Fig. 2 (b) are application motor of the present utility model etc.

Fig. 3 (a), Fig. 3 (b) are for showing the key diagram of the state be shifted towards the direction orthogonal with motor axis at application motor rotor of the present utility model.

Fig. 4 (a), Fig. 4 (b), Fig. 4 (c) cause rotating the key diagram of the state stopped for showing rotating shaft inclination in motor.

(symbol description)

1 motor

1a outlet side bearing portion

1b exports opposition side bearing portion

2 rotating shafts

The outer peripheral face of 2c rotating shaft

The end of 2e rotating shaft

2f rotation shaft side recess

The 2h conical surface

3 magnet

The outer peripheral face of 3c magnet

4 rotors

5 coils

6 spheroids

7 parts of bearings

8 retainers

9 plate-shaped members

10 stators

The inner peripheral surface of 10c stator

81 through holes

91 base plate

95 plate spring part

L0 motor axis

The central axis of Ls rotating shaft

L1 outlet side

L2 exports opposition side

Embodiment

With reference to accompanying drawing, an example of application motor of the present utility model is described.In addition, in the utility model, the side outstanding from stator 10 of the rotating shaft 2 on motor axis L0 direction is outlet side L1, and the side contrary with the side being extruded with rotating shaft 2 from stator 10 is for export opposition side L2.At this, motor axis L0 is the central axis of stator 10, and under the state that rotating shaft 2 does not tilt, the central axis Ls of rotating shaft 2 is consistent with motor axis L0.Further, in the following description, radial direction refers to the direction orthogonal with motor axis L0 direction.Further, in the following description, in order to easy understand with reference to accompanying drawing 4 (a), the corresponding part of structure that is described of Fig. 4 (b), Fig. 4 (c), and identical symbol marked to corresponding parts be described.

(Sketch of motor)

Fig. 1 (a), Fig. 1 (b) are the partial sectional view applying motor 1 of the present utility model, and Fig. 1 (a) is the cutaway view of motor 1 entirety, and Fig. 1 (b) is for being configured with the partial sectional view of the part of stator 10.

Motor 1 shown in Fig. 1 (a), Fig. 1 (b) is permanent magnet (PM:Permanent Magnet) type stepper motor, and is small stepper motor.Motor 1 has: rotor 4, and described rotor 4 has rotating shaft 2 and is fixed on the magnet 3 of outer peripheral face 2c of rotating shaft 2; And stator 10, described stator 10 is tubular and opposed with the outer peripheral face 3c of magnet 3 at radial outside.The outlet side L1 of stator 10 is provided with framework 11.Framework 11 has: the first plate portion 111, and the end face of the outlet side L1 of stator 10 is fixed in described first plate portion 111 by methods such as welding; Second plate portion 112, described second plate portion 112 is and the end 2r of the outlet side L1 of supporting rotating shaft 2 opposed with the first plate portion 111 at outlet side L1; And connecting portion 113, described connecting portion 113 extends along motor axis L0 direction, and is connected with the second plate portion 112 in the first plate portion 111.Be formed in the first plate portion 111 for the through hole 115 of rotating shaft 2.Further, motor 1 has: Shu Chu Ce Shaft is by portion 1a, the described Shu Chu Ce Shaft end 2r by the outlet side L1 of portion 1a supporting rotating shaft 2; And export opposition side bearing portion 1b, the end 2e of the output opposition side L2 of described output opposition side bearing portion 1b supporting rotating shaft 2.

(Shu Chu Ce Shaft is by the structure of portion 1a)

Shu Chu Ce Shaft is by portion 1a, parts of bearings 18 is kept by the second plate portion 112 of framework 11, the end 2r of the outlet side L1 of rotating shaft 2 is embedded into the inner side of recess 182 with the end, thus radial and axially can be rotated by supporting, described recess 182 in the cylinder portion 181 of parts of bearings 18 towards output opposition side L2 opening.Parts of bearings 18 has large-diameter portion 184, described large-diameter portion 184 is formed through the state in the hole 116 in the second plate portion 112 in framework 11 with cylinder portion 181, abut with the face of the output opposition side L2 in the second plate portion 112, large-diameter portion 184 limits parts of bearings 18 and moves towards outlet side L1.Further, the end of the end 2r of the outlet side L1 of rotating shaft 2 is processed to hemispherical.

(exporting the Sketch of opposition side bearing portion 1b)

Be formed in output opposition side bearing portion 1b: parts of bearings 7, described parts of bearings 7 is made up of sliding bearing; Retainer 8, described retainer 8 is tubular and is supported by parts of bearings 7 as moving along motor axis L0 direction; And plate-shaped member 9, described plate-shaped member 9 has the plate spring part 95 (force application part) exerted a force towards the outlet side L1 of rotating shaft 2 by parts of bearings 7.Further, between rotating shaft 2 and parts of bearings 7, be configured with the spheroid 6 be made up of steel ball.

(structure of rotor 4)

In rotor 4, the outlet side L1 of rotating shaft 2 gives prominence to from stator 10, and the outer peripheral face of the part 2g outstanding from stator 10 in rotating shaft 2 is formed with driving screw 2a.Driving screw 2a is such as moved body with optical take-up apparatus etc. and screws togather, thus makes to be moved body rectilinear motion.In the present embodiment, the external diameter of the part 2g given prominence to towards outlet side L1 from stator 10 of rotating shaft 2 is larger than the external diameter of part of the inner side being positioned at stator 10.

At this, be formed with cross section at the end 2e of the output opposition side L2 of rotating shaft 2 to be in the shape of the letter V the rotation shaft side recess 2f of shape, described rotation shaft side recess 2f is towards output opposition side L2 opening bearing balls 6, and the inner peripheral surface of this rotation shaft side recess 2f is formed as by taper seat or the conical surface 2h that is made up of pyramidal surface.

Magnet 3 is the permanent magnet of the cylindrical shape that N pole and S pole are circumferentially alternately formed, and in the outer peripheral face 2c of rotating shaft 2, two magnet 3 are fixed on the position be separated on motor axis L0 direction by bonding agent.The external diameter equidimension of these two magnet 3 is identical.

(structure of stator 10)

Stator 10 has the first stator pack 12 and the second stator pack 13, described first stator pack 12 and described second stator pack 13 overlay configuration on motor axis L0 direction.In the present embodiment, the first stator pack 12 is configured in and exports opposition side L2, and the second stator pack 13 is configured in outlet side L1.

First stator pack 12 has: outer yoke 14; Drum stand 15, described drum stand 15 is wound with coil 5; Interior yoke 16, described interior yoke 16 is so that by drum stand 15, the mode be clamped between described interior yoke 16 and outer yoke 14 configures; And first housing 17, described first housing 17 covers these parts from radial outside and from output opposition side L2.This first stator pack 12 is configured in the radial outside being positioned at the magnet 3 exporting opposition side L2.

Drum stand 15 is the cartridge had at the two ends in motor axis L0 direction along portion, and is being wound with coil 5 between portion.In drum stand 15, be formed with terminal board 15a, in terminal board 15a, be fixed with the terminal (omitting diagram) of the end of connecting coil 5.

Outer yoke 14 has: annular portion, and described annular portion is exporting the overlapping along portion of opposition side L2 and drum stand 15; And pole tooth 14a, described pole tooth 14a is multiple and bends from the inner edge of annular portion towards outlet side L1.Interior yoke 16 has: annular portion, and described annular portion is overlapping along portion outlet side L1 and drum stand 15; And pole tooth 16a, described pole tooth 16a is multiple and bends towards output opposition side L2 from the inner edge of annular portion, outside under yoke 14 and the state of interior yoke 16 relative to drum stand 15 overlap, pole tooth 14a, 16a along the inner peripheral surface of drum stand 15 with the alternately configuration of the spacing of regulation.Therefore, the inner peripheral surface 10c of stator 10 is specified by the face of the radially inner side of pole tooth 14a, 16a.

First housing 17 is formed by sheet metal, and passes through punch process and formed.Further, the first housing 17 has: end plate 171, and described end plate 171 covers outer yoke 14 at output opposition side L2, thus forms the output opposition side end face of stator 10; And side plate 172, described side plate 172 covers drum stand 15 etc. at radial outside.Be formed in the end plate 171 of the first housing 17 for the through peristome 175 of parts of bearings 7.

Second stator pack 13 has the structure identical with the first stator pack 12.That is, the second stator pack 13 has: outer yoke 19; Drum stand 20, described drum stand 20 is wound with coil 5; Interior yoke 21, described interior yoke 21 is so that by drum stand 20, the mode be clamped between described interior yoke 21 and outer yoke 19 configures; And second housing 22, described second housing 22 covers these parts from radial outside and outlet side L1.This second stator pack 13 is configured in the radial outside of the magnet 3 being positioned at outlet side L1.

Drum stand 20 is the cartridge had at the two ends in motor axis L0 direction along portion, between portion, be wound with coil 5.In drum stand 20, be formed with terminal board 20a, in terminal board 20a, be fixed with the terminal (omitting diagram) of the end of connecting coil 5.

Outer yoke 19 has: annular portion, and described annular portion is overlapping along portion outlet side L1 and drum stand 20; And pole tooth 19a, described pole tooth 19a are multiple and bend from the inner edge of annular portion towards output opposition side L2.Interior yoke 21 has: annular portion, and described annular portion is exporting the overlapping along portion of opposition side L2 and drum stand 15; And pole tooth 21a, described pole tooth 21a is multiple and bends from the inner edge of annular portion towards outlet side L1, outside under yoke 19 and the state of interior yoke 21 relative to drum stand 20 overlap, pole tooth 19a, 21a along the inner peripheral surface of drum stand 20 with the alternately configuration of the spacing of regulation.Therefore, the inner peripheral surface 10c of stator 10 is specified by the face of the radially inner side of pole tooth 19a, 21a.

Second housing 22 is formed by sheet metal, and passes through punch process and formed.Further, the second housing 22 has: end plate 221, and described end plate 221 covers outer yoke 19 at outlet side L1, thus forms the outlet side end face of stator 10; And side plate 222, described side plate 222 covers drum stand 20 etc. at radial outside.Be formed in the end plate 221 of the second housing 22 for the through peristome 225 of rotating shaft 2.

The stator 10 of formation like this is configured to circular or oval shape when observing from motor axis L0 direction.When stator 10 is configured to oval shape, be formed as having identical radius of curvature and the center of curvature circular arc and by the shape of two parallel straight lines of these two circular sliding slopes.

(structure of parts of bearings 7)

The key diagram of the output opposition side bearing portion 1b that Fig. 2 (a), Fig. 2 (b) are application motor 1 of the present utility model etc., Fig. 2 (a) is for exporting the cutaway view of opposition side bearing portion 1b etc., and Fig. 2 (b) is for showing the key diagram of the size relationship exporting opposition side bearing portion 1b etc.

In Fig. 2 (a), Fig. 2 (b), be configured with parts of bearings 7 at the output opposition side L2 of motor 1.Parts of bearings 7 is formed from a resin, and by using the processing and forming manufacture of mould to form.Parts of bearings 7 has the substantial cylindrical shape that axis extends along motor axis L0 direction, and rotating shaft 2 and stator 10 are in same heart shaped.In the present embodiment, parts of bearings 7 has the large diameter portion 7a being positioned at output opposition side L2 and the path part 7b being positioned at outlet side L1, the outside dimension of path part 7b is slightly less than the outside dimension of large diameter portion 7a, further, path part 7b is formed as outside dimension along with the diameter shrinkage part reduced continuously towards outlet side L1.

The middle body in face by outlet side L1 in parts of bearings 7 is formed towards the outlet side recess 70 with the level of outlet side L1 opening, and this outlet side recess 70 is by the large end accommodation recess 71 of internal diameter and form towards the bearing side recess 72 exporting the sphere supports that opposition side L2 caves in further from the bottom of end accommodation recess 71.The position that the end 2e that end accommodation recess 71 is rotating shaft 2 enters, bearing side recess 72 is the position of bearing balls 6.

Bearing side recess 72 has the side 72a parallel with motor axis L0 direction and is bottom 72b that is coniform or pyramid-shaped.Therefore, spheroid 6 is in the state supported by the bearing side recess 72 of the rotation shaft side recess 2f of rotating shaft 2 and parts of bearings 7, and consequently rotating shaft 2 is formed as the state that supported by parts of bearings 7 by spheroid 6.Further, when rotor 4 rotates, spheroid 6 together rotates with rotating shaft 2.Therefore, when rotor 4 rotates, slide at side 72a and the spheroid 6 and producing between bottom 72b and spheroid 6 of bearing side recess 72.

The result forming this parts of bearings 7 is: have circular protuberance 75 at the radial outside of end accommodation recess 71, described protuberance 75 is given prominence to towards outlet side L1 in the mode of the end 2e surrounding rotating shaft 2 at radial outside, and protuberance 75 is same heart shaped with rotating shaft 2 and stator 10.

The output opposition side recess 76 caved in towards outlet side L1 is formed at the middle body in the face of the output opposition side L2 of parts of bearings 7, consequently, the projection 77 being formed with the ring-type of giving prominence to towards output opposition side L2 from the bottom exporting opposition side recess 76 around opposition side recess 76 is being exported.The degree of depth (end accommodation recess 71 and bearing side recess 72) that the depth ratio of this output opposition side recess 76 is formed at the outlet side recess 70 of outlet side L1 is much shallow.

(structure of retainer 8)

Retainer 8 is formed by metal material.Further, retainer 8 is by using the formation such as the die-casting process of mould.Retainer 8 is formed as flat roughly rectangular-shaped.In retainer 8, be formed with the through hole 81 of circle through on motor axis L0 direction, retainer 8 utilizes the inner peripheral surface 81c of through hole 81 to support the large diameter portion 7a of parts of bearings 7 for can move along motor axis L0 direction.Retainer 8 is configured in and is exporting opposition side L2 adjoining position with the end plate 17 of the first housing 17, and is configured in the outside of the first housing 17.In the present embodiment, retainer 8 is fixed on the face by exporting opposition side L2 of end plate 171.Specifically, retainer 8 is by being fixedly welded on end plate 171.In the present embodiment, retainer 8 is fixed on end plate 171 by projection welding.

At this, be formed in the end plate 171 of the first housing 17 for the through peristome 175 of parts of bearings 7.In the present embodiment, the internal diameter of peristome 175 is identical with the internal diameter size of the through hole 81 of retainer 8, and the inner peripheral surface of peristome 175 is overlapping with the inner peripheral surface 81c of the through hole 81 of retainer 8 on motor axis L0 direction.Therefore, in the present embodiment, the inner peripheral surface 81c of the inner peripheral surface of peristome 175 and the through hole 81 of retainer 8 together forms and to be supported by retainer 8 as can along the bearing face 80 of motor axis L0 direction movement.

(structure of plate-shaped member 9)

Plate-shaped member 9 is fixed on the output opposition side L2 of retainer 8.Multiple side plates 92 that plate-shaped member 9 has the base plate 91 overlapping with the face of the output opposition side L2 of retainer 8 and bends from the end of base plate 91 to outlet side L1, plate-shaped member 9 is fixed on retainer 8 by the one group of side plate 92 opposite each other in multiple side plate 92.

In plate-shaped member 9, plate spring part 95 (force application part) is tilted to bend by towards outlet side L1 near the central authorities of base plate 91, this plate spring part 95 abuts with the bottom of output opposition side recess 76 in face of the output opposition side L2 being formed at parts of bearings 7, and is exerted a force the side (outlet side L1: first direction) of parts of bearings 7 towards rotating shaft 2.Therefore, rotating shaft 2 exerts a force towards outlet side L1 by parts of bearings 7 and spheroid 6 by plate spring part 95.Therefore, rotating shaft 2 is exerted a force by towards outlet side bearing 18 (with reference to Fig. 1 (a)), therefore, it is possible to suppress rotating shaft 2 to rock on motor axis L0 direction.

Further, in plate-shaped member 9, base plate 91 plays a role as stopper section, and described stopper section specifies that parts of bearings 7 resists the active force of plate spring part 95 towards the movable range exported when opposition side L2 (second direction) moves.

In the present embodiment, the abutting to the position of departing from from approximate centre part radius vector of plate spring part 95 and parts of bearings 7.Therefore, in the inner side of retainer 8, parts of bearings 7 is formed as the state tilted a little, increases to make the contact of the position opposite each other in bearing holding surface 80 between the outer peripheral face of bearing holding surface 80 and parts of bearings 7.Therefore, even if the machining accuracy of parts of bearings 7 is low, also can prevent parts of bearings 7 from rocking relative to bearing holding surface 80.In addition, if form recess at multiple positions of the circumference of peristome 175, then can reduce the contact area between the outer peripheral face of parts of bearings 7 and bearing holding surface 80, the resistance to sliding between the outer peripheral face of parts of bearings 7 and bearing holding surface 80 can be reduced thus.Thus, even if utilize plate-shaped member 9 to exert a force to make parts of bearings 7 tilt, parts of bearings 7 also can be made to move swimmingly along motor axis L0 direction.

(sizes in gap etc.)

In the motor 1 formed like this, because driving screw 2a is formed at rotating shaft 2, therefore when rotating shaft 2 rotates, can apply towards the load exporting opposition side L2 rotating shaft 2 owing to being applied to the side pressure of the radial direction of rotating shaft 2.Further, also can exist the rotating shaft 2 applying impact in rotation thus rotating shaft 2 is applied towards the situation of the load exporting opposition side L2.Further, even if in the process of motor 1 stopping, also existing and apply to impact to rotating shaft 2 and rotating shaft 2 is applied towards the situation of the load exporting opposition side L2.Consequently, as illustrated with reference to Fig. 4 (a), Fig. 4 (b), Fig. 4 (c), if parts of bearings 7 is shifted towards output opposition side L2, thus remove the state that supported by parts of bearings 7 by spheroid 6 of rotating shaft 2, then rotating shaft 2 can produce this displacement that the central axis Ls of rotating shaft 2 and motor axis L0 direction tilt.If parts of bearings 7 now can be set to d (mm) towards the movable distance exporting opposition side L2 movement, then movable distance d equals the interval of the projection 77 of the ring-type of the output opposition side L2 being positioned at parts of bearings 7 and the base plate 91 (stopper section) of plate-shaped member 9.

Therefore, in the present embodiment, as aftermentioned with reference to Fig. 3 (a), Fig. 3 (b), the interval between the outer peripheral face 3c of the magnet 3 and inner peripheral surface 10c of stator 10 being set to G (mm), the radius of spheroid 6 being set to r (mm), the angle that the central axis Ls of rotating shaft 2 and conical surface 2h is formed being set to θ, when the distance between the opening edge of conical surface 2h and the central axis Ls of rotating shaft 2 being set to R (mm), movable distance d, radius r, interval G, angle θ and distance R satisfy the following conditional expression 1 and conditional 2, namely

Conditional 1:R > rcos θ+dtan θ

Conditional 2:G > dtan θ.

Therefore, even if rotating shaft 2 tilts when parts of bearings 7 movable distance d mobile towards output opposition side L2 (second direction), as shown in Fig. 4 (b), conical surface 2h also can contact with spheroid 6, and the outer peripheral face 3c of magnet 3 is in the state be separated with stator 10.Therefore, even if unduly expand the interval between the outer peripheral face 3c of setting the magnet 3 and inner peripheral surface 10c of stator 10, rotor 4 also can be suppressed to produce the situation that cannot rotate.Further, even if rotating shaft 2 tilts, when also can disappear at the load being applied to rotating shaft 2, the state shown in Fig. 4 (a) is returned to.

(about conditional 1,2)

Fig. 3 (a), Fig. 3 (b) are for showing the key diagram of the state be shifted along the direction orthogonal with motor axis L0 at application motor 1 rotor 4 of the present utility model, the cutaway view of the state that Fig. 3 (a) is shifted along the direction orthogonal with motor axis L0 for rotor 4, Fig. 3 (b) is for showing the key diagram of each size relationship when rotor 4 is shifted along the direction orthogonal with motor axis L0.

In the present embodiment, as illustrated with reference to Fig. 4 (b), under the state that rotating shaft 2 tilts, the angle [alpha] formed due to the central axis Ls of motor axis L0 and rotating shaft 2 is less, therefore can think that rotating shaft 2 conjugates along the direction orthogonal with motor axis L0, and following condition is studied: even if rotating shaft 2 tilts when parts of bearings 7 movable distance d mobile towards output opposition side L2 (second direction), rotating shaft 2 also can rotate, and returns to the state of Fig. 4 (a) when the load being applied to rotating shaft 2 disappears.

First, in Fig. 3 (b), if parts of bearings 7 is towards the mobile movable distance d of output opposition side L2 (second direction), then spheroid 6 moves to the shown position of chain-dotted line 6 ' from the position shown in solid line.In addition, with an O represent spheroid 6 move before center, with an O ' represent spheroid 6 move after center.

If produce this movement, then rotating shaft 2 is along the direction translocation distance △ x with motor axis L-orthogonal.This displacement as a result, the central axis Ls of rotating shaft 2 moves to the shown position of chain-dotted line Ls ', the outer peripheral face 3c of magnet 3 moves to the shown position of chain-dotted line 3c ' from the position shown in solid line.Further, the conical surface 2h of rotating shaft 2 moves to the shown position of chain-dotted line 2h ' from the position shown in solid line, and contacts with spheroid 6.In addition, the position that the conical surface 2h of the rotating shaft 2 before rotating shaft 2 moves contacts with spheroid 6 represents with some Q, and the position that the conical surface 2h of the rotating shaft 2 after rotating shaft 2 moves contacts with spheroid 6 represents with some Q '.Further, the position at the top of the conical surface 2h before rotating shaft 2 moves represents with some P, and the tip position of the conical surface 2h after rotating shaft 2 moves represents with some P '.

At this, distance △ x equals a P to the distance putting P ', therefore passes through following formula

△ x=dtan θ asks for.

Further, the distance (P1-P) between position (some Q) the concentricity axis Ls contacted with spheroid 6 due to the conical surface 2h of rotating shaft 2 before rotating shaft 2 moves passes through following formula

Distance (P1-P)=rcos θ asks for,

Therefore rotating shaft 2 move after position (some Q ') the concentricity axis Ls ' that contacts with spheroid 6 of the conical surface 2h of rotating shaft 2 between distance (P1-P ') pass through following formula

Distance (P1-P ')=distance (P1-P)+△ x

=rcos θ+dtan θ asks for.

At this, even if realize rotating shaft 2 to move rotating shaft 2 and also can rotate, and return to the state shown in Fig. 4 (a) when the load being applied to rotating shaft 2 disappears, as long as meet the condition 2 that after conditional 1 that rear cone 2h that rotating shaft 2 moves also can contact with spheroid 6 and rotating shaft 2 move, the outer peripheral face 3c of magnet 3 is also separated with the inner peripheral surface 10c of stator 10.Therefore, the former condition 1 be met, as long as satisfy the following conditional expression 1,

Conditional 1:R > rcos θ+dtan θ.

Further, the condition 2 of the latter be met, as long as satisfy condition formula 2:G > dtan θ.

Such as, by parts of bearings 7 can towards export the movable distance d of opposition side L2 movement be set to 0.16mm, the radius r of spheroid 6 is set to 0.05mm, the angle θ that the central axis Ls of rotating shaft 2 and conical surface 2h is formed is set to 30 ° time, the distance R (mm) between the opening edge of the conical surface 2h of spheroid 6 and the central axis Ls of the rotating shaft 2 and interval G (mm) between the outer peripheral face 3c of the magnet 3 and inner peripheral surface 10c of stator 10 is formed as following condition.

Conditional 1:R > rcos θ+dtan θ

＝0.5×0.866+0.16×0.557

＝0.525

Conditional 2:G > dtan θ

＝0.16×0.577

＝0.0923

Therefore, as long as the distance R between the opening edge of the conical surface 2h of spheroid 6 and the central axis Ls of rotating shaft 2 is at more than 0.525mm.Further, the interval G (mm) between the outer peripheral face 3c of the magnet 3 and inner peripheral surface 10c of stator 10 is as long as at more than 0.0923mm.Now, movable distance d is configured to the condition of 1.73 times of interval G.Like this, according to the present embodiment, as long as owing to meeting above-mentioned conditional 1,2, therefore need not interval G between the excessive enlargement setting outer peripheral face 3c of the magnet 3 and inner peripheral surface 10c of stator 10, the larger torque of acquisition can be crossed thus.

At this, the angle θ that the central axis Ls of preferred rotating shaft 2 and the conical surface 2 are formed, below 45 °, such as, is approximately 30 °.In this case, as long as movable distance d is configured in the scope of 1.5 times to 1.6 times of interval G.According to this structure, when the angle θ formed between the central axis of rotating shaft and the conical surface is set in about 30 °, can interval G between the outer peripheral face of excessive enlargement magnet and stator.Therefore, it is possible to obtain larger torque in motor.

(other execution modes)

Above-mentioned execution mode is an example of preferred implementation of the present utility model, but is not limited thereto, and can implement various distortion in the scope not changing purport of the present utility model.

Such as, in the above-described embodiment, show parts of bearings 7 to move along motor axis L direction, by the motor 1 that parts of bearings 7 exerts a force towards rotating shaft 2 by the force application part (plate spring part 95) being configured in output opposition side L2, but also the utility model can be applied to and rotating shaft 2 can be moved along motor axis L direction, the motor 1 of this structure utilizing the force application part being configured in outlet side L1 to be exerted a force towards parts of bearings 7 by rotating shaft 2.

Claims (5)

1. a motor, is characterized in that, this motor comprises:

Rotor, described rotor has rotating shaft and magnet, and be formed with cross section in the end of the output opposition side of described rotating shaft and be in the shape of the letter V the rotation shaft side recess of shape, described magnet is fixed on the outer peripheral face of described rotating shaft;

Stator, described stator is tubular, and opposed with the outer peripheral face of described magnet at radial outside;

Export opposition side bearing portion, described output opposition side bearing portion has spheroid and parts of bearings, and described spheroid abuts with the conical surface of described rotation shaft side recess, described parts of bearings by described sphere supports between described parts of bearings and the described conical surface;

Force application part, described force application part applies the active force of the first direction that described rotating shaft is contacted with described spheroid to the side component in described rotating shaft and described parts of bearings; And

Stopper section, the described side component of described stopper section restriction moves towards the second direction of side opposite to the first direction,

When the movable distance towards described second direction of a described side component is set to d, the radius of described spheroid is set to r, the interval between the outer peripheral face of described magnet and described stator is set to G, the angle that the central axis of described rotating shaft and the described conical surface are formed is set to θ, when the distance between the opening edge of the described conical surface and the central axis of described rotating shaft is set to R, described movable distance d, described radius r, described interval G, described angle θ and described distance R satisfy the following conditional expression 1 and conditional 2, namely

Conditional 1:R > rcos θ+dtan θ,

Conditional 2:G > dtan θ.

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

A described side component is described parts of bearings,

Described output opposition side bearing portion has retainer, and described retainer has by the supporting of described parts of bearings for can the through hole of movement in the axial direction,

Described parts of bearings exerts a force towards the outlet side as described first direction by described force application part,

Described stopper section limits described parts of bearings and moves towards the output opposition side as described second direction.

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

Described force application part abuts with the position of departing from from core towards radial direction of described parts of bearings.

4. the motor according to any one in claims 1 to 3, is characterized in that,

Described movable distance d is 1.5 times of described interval G to 1.6 times.

5. the motor according to any one in claims 1 to 3, is characterized in that,

The angle θ that the central axis of described rotating shaft and the described conical surface are formed is less than 45 °.