CN1089201C - Stepping motor - Google Patents
Stepping motor Download PDFInfo
- Publication number
- CN1089201C CN1089201C CN 98105860 CN98105860A CN1089201C CN 1089201 C CN1089201 C CN 1089201C CN 98105860 CN98105860 CN 98105860 CN 98105860 A CN98105860 A CN 98105860A CN 1089201 C CN1089201 C CN 1089201C
- Authority
- CN
- China
- Prior art keywords
- motor
- bearing body
- bearing
- rotation axis
- pressing element
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000008188 pellet Substances 0.000 description 24
- 230000008093 supporting effect Effects 0.000 description 10
- 238000012423 maintenance Methods 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 206010068051 Chimerism Diseases 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
To obtain a stepping motor having an improved structure for bearing the rotary shaft of a motor in which the number of parts is decreased and a biasing member can be provided removably while reducing the sliding loss. One thrust bearing out of two thrust bearings is provided with a bearing body having a curved face abutting against the rotary shaft of a motor, a guide member having a part for permitting axial movement of the bearing body and guiding the movement thereof, and a biasing a plate for spring biasing the bearing body toward the other bearing wherein the guide member is bonded to the stator part .
Description
The present invention relates to stepping motor, relate in particular to the improvement of stepping motor rotation axis bearing structure.
Shown in Figure 5 as described later, tradition exists in the stepping motor 101 that forms driving screw portion 103 on the motor rotation axis 102, the structure of an end 111 usefulness thrust bearings 104 supportings of motor rotation axis 102.In this occasion, journal bearing 105 radial support motor rotation axis made from metal or resin etc. 102 also are in order to prevent to produce eccentric rotation.In addition, fixed installation rotor core 107 on motor rotation axis 102 makes with stator department 106 face-to-face, and has minim gap.
In addition, this stepping motor 101 possesses the flat spring 108 that contacts with the other end 112 of motor rotation axis 102, pushes with 108 pairs of motor rotation axis 102 elasticity of this flat spring, produces vibration vertically to prevent motor rotation axis 102.In addition, making flat spring 108 produce deflection, motor rotation axis 102 being walked about and baffle plate 109 is set for not making because of impact waiting.
Yet, in above-mentioned stepping motor 101, when sliding mutually with journal bearing 105 owing to motor rotation axis 102 slippage loss takes place and has moment of torsion or the high-speed response problem that is difficult to improve stepping motor.Simultaneously and since with welding with flat spring 108 to the outside of motor field frame 110 install and fix, from stepping motor 101 outsides to motor rotation axis 102 applied thrusts, and flat spring 108 can not be unloaded, decomposes, be difficult to carry out the part transposing and maintain.In addition, owing to need to constitute in addition to prevent the baffle plate that motor rotation axis 102 is walked about, number of parts is increased.
Therefore, the object of the invention is to provide the stepping motor with improvement bearing arrangement that the part number is few, the elasticity pressing member can load and unload, slippage loss is little.
Stepping motor of the present invention by at least one thrust bearing two thrust bearings of the motor rotation axis that stretches out from stator department, the described motor rotation axis of supporting by the bearing body that above-mentioned motor rotation axis is moved vertically, have and allow this bearing body to move vertically, simultaneously this bearing body moved the ways of the guide part that leads and above-mentioned bearing body is constituted towards the pressing element that described another thrust bearing carries out the elasticity pressurization, described ways is fixed on the described stator department.
Because the present invention adopts said structure, so the offset of motor rotation axis is reduced.In addition, the journal bearing of radial support motor rotation axis can be set, just not have the slippage loss that takes place between motor rotation axis and journal bearing, so can make moment of torsion and high-speed response raising.
Simple declaration to accompanying drawing
Fig. 1 is the longitudinal section of expression stepping motor embodiment of the present invention.
Fig. 2 represents that the pellet shot from a slingshot of bearing body keeps body, (a) is longitudinal section, (B) is end view.
Fig. 3 represents ways, (A) is the longitudinal section along the III-III line, (B) is end view.
Fig. 4 represents pressing element, (A) is longitudinal section, (B) is end view.
Fig. 5 is the longitudinal section of the traditional stepping motor of expression.
Below, describe structure of the present invention in detail by the accompanying drawing illustrated embodiment.
Fig. 1 represents stepping motor one embodiment of the present invention.The motor rotation axis 3 that stretches out at the stator department 2 from this stepping motor 1 forms driving screw portion 4, and electric drive axle 3 is by 5,6 supportings of two bearings, and wherein at least one is a thrust bearing, is used for the axial execution elasticity pressurization to this motor rotation axis 3.In the present embodiment, two bearings 5,6 is all used thrust bearing, the front end of usefulness thrust bearing 5 supporting motor rotating shafts 3; With this rear end of thrust bearing 6 supporting.In addition, the thrust bearing 6 of one side have the contact-making surface that contact with motor rotation axis 3 of handle form curved surface a bearing body 7, allow this bearing body 7 to move vertically, simultaneously this moved axially the ways 8 of the guide part 8a that leads and, ways 8 is fixed on the stator department 2 bearing body 7 pressing element 9 that pressurizes of elasticity vertically.
In addition, has the thrust bearing 5 of the preceding end bearing of the motor rotation axis 3 that will stretch out from this stator department 2, simultaneously, fixedly install to stepping motor 1 is installed the U-shaped frame 16 of usefulness on various machines in a side of stretching out from stator department 2 of rotating shaft 3.Setting makes motor rotation axis 3 at the through hole 16a that loosening chimerism runs through on this frame 16, in addition, is provided with the installing hole 16b of installed thrust bearing 5.Set the internal diameter of axle through hole 16a littler than the external diameter of aftermentioned rotor core 17.
The driving screw portion 4 that forms on motor rotation axis 3 is identical with traditional driving screw, has to make slide block 31 that driving screw portion 4 therewith cooperates with motor rotation axis 3 rotations, mobile function vertically.In addition, control the moving direction of slide block 31 by the direction of rotation of converting motor rotating shaft 3.
The bearing body 7 that constitutes thrust bearing 6 is constituted the curve form contact-making surface that has by the circular cone recess 3b supporting of motor rotation axis 3.This contact-making surface shape is not particularly limited,, has utilized pellet shot from a slingshot 19 for example in the present embodiment occasion.Specifically, the bearing body 7 of present embodiment keeps body 20 to constitute by a pellet shot from a slingshot 19 and the pellet shot from a slingshot that holds this pellet shot from a slingshot 19.
As shown in Figure 2, this pellet shot from a slingshot keep body 20 have for the cylindric circular depressions 20a that holds pellet shot from a slingshot 19, with the notch part 10a of aftermentioned ways 8 cooperate, prevent bearing body 7 rotations, along circumferentially by uniformly-spaced outstanding three stop and rotate lug boss 20b and for to prevent that the 9a of flat spring portion of aftermentioned pressing element 9 from producing undue deflection, contacting and limit the mobile restriction extension 20c that bearing body 7 stretches out to axially movable bearing rear side with the flat part 9c of pressing element 9.
In addition, around circular depressions 20a, form the circular protrusions 20d that surrounds this circular depressions 20a, be used to prevent that the axle head of motor rotation axis 3 from radially skidding off, simultaneously, in circular depressions 20a, leave the occasion of oil, be used for preventing that oil splashes or consumes and do here.With the external diameter of pellet shot from a slingshot 20 form with the inner peripheral surface internal diameter of stator department 2 about equally so as easily and aftermentioned motor rotation axis 3 carry out the center.Consider to making this pellet shot from a slingshot keep body 20 to reach sliding between lightweight and pellet shot from a slingshot 19 and the ways 8, should use resin forming product, but also not necessarily, for example also can use metallic article by occasion.
As shown in Figure 3, the ways 8 that bearing body 6 is led is the plectane body, formation allows bearing body 7 to move vertically, simultaneously this is moved the guide part 8a that leads in the central.With the internal diameter size f of this guide part 8a form keep body 20 with pellet shot from a slingshot outside dimension e about equally, for guaranteeing to have each other a little gap that only can make the pellet shot from a slingshot that is embedded in this guide part 8a keep body 20 to move.In addition, its internal diameter size d with the cylindrical shape inner peripheral surface of stator department 2 is equated.In addition, on this guide part 8a, the escape portion 10 that the 9a of flat spring portion that prevents aftermentioned pressing element 9 contacts with guide part 8a is set along circumferential equally spaced three places.Shape to this escape portion 10 is not particularly limited, and for example in the present embodiment occasion, forms notch part 10a that radially extends and the rake 10b that is arranged on the periphery of this notch part 10a.The hook 9b hook of aftermentioned pressing element 9 is socketed the flange portion 8b that closes to be arranged on according to the size that can hold hook 9b on the circumferential edges of ways 8, along circumferentially everywhere equally spaced.In addition, carry out in the marginal portion of this flange portion 8b to loading and unloading the chamfered of hook 9b easily.With welding metallic ways 8 is installed in the rear side assigned position of stator department 2 in the present embodiment.
Pressurize vertically with the 9 pairs of bearing bodies 7 of pressing element that are installed in from rear side on the ways 8.As shown in Figure 1 and Figure 4, the 9a of flat spring portion contact with bearing body 7 at ordinary times, this bearing body 7 is pressurizeed is set on this pressing element 9.Quantity, shape to the 9a of this flat spring portion are not particularly limited, for example in the present embodiment occasion, by make the amount of having cut according to from outside circumferentially central authorities increase, cut three 9a of flat spring portion of formation.But, this is not limited, also the 9a of flat spring portion can be formed the shape of cutting to periphery from central portion, perhaps also can other board member be installed on pressing element 9 and form flat spring 9a.In addition, as shown in the figure, the present embodiment flat spring 9a of portion can have been cut and form the shape that the flat part 9e that makes beyond the flat spring 9a links to each other at the central portion of pressing element 9.And by bearing body 7 move at axial rear side, pellet shot from a slingshot keeps the extension 20c of body 20 to contact with pressing element 9, is used for limiting the excessive shrinkage of the 9a of flat spring portion that moves, prevents pressing element 9 of pellet shot from a slingshot maintenance body 20.In addition, also should not make this pellet shot from a slingshot keep body 20, motor rotation axis 3 passes to rear side.That is to say, the barrier plate effect that makes the flat part 9c performance of pressing element 9 keep the axial internal clearance of body 20, motor rotation axis 3 as the restriction pellet shot from a slingshot is attached to the 9a of flat spring portion that prevents the heavy fatigue of the 9a of flat spring portion seat and prevent deflection and is being attached on the pressing element 9 lip-deep sign sealing surfaces.
In addition, on the circumferential edges of this pressing element 9, along the circumferential direction by uniformly-spaced be set to engage with the flange portion 8b of ways 8, for pressing element 9 being fixedly mounted on four hook 9b at junction surface on the ways 8.The root of hook 9b is formed suitable circle, makes and have elasticity.In addition, also can be attached to the sign of the rated value that for example will represent this stepping motor 1 etc. on the rear side surface of this pressing element 9.
Another thrust bearing 5 keeps body 18 to constitute by a pellet shot from a slingshot 19 that contacts with the circular cone recess 3a of motor rotation axis 3 and the bearing that possesses the pellet shot from a slingshot maintenance body 20 that holds this pellet shot from a slingshot 19.Bearing keeps body 18 because of possessing than the big flange 5a of the internal diameter size of the installing hole 16b on the frame 16 and being installed on the frame 16, even by motor rotation axis 3 applied thrusts, also can outwards not skid off vertically.In addition, much less, also can thrust bearing 5 formations are identical with thrust bearing 6, be exactly to implement the elasticity pressurization to motor rotation axis 3 vertically, it can be moved axially.
The stepping motor 1 of Gou Chenging as mentioned above, owing to again the axle head and the contact-making surface that contacts with pellet shot from a slingshot 19 of bearing body 7,18 are shaped as the curve form of the surface configuration of pellet shot from a slingshot 19 simultaneously with two bearings, 5,6 supporting motor rotating shafts 3, thereby, the journal bearing of radial support motor rotation axis 3 is not set, just can makes not have slippage loss between motor rotation axis 3 and journal bearing yet.Therefore, can make motor rotation axis 3 rotations, the moment of torsion when slide block 31 moves and high-speed response raising.
In addition, can be to moving axially owing to make at the bearing body 7 of axle head supporting motor rotating shaft 3, and with the 9a of flat spring portion of pressing element 9 bearing body is implemented elasticity vertically and pressurize, when thrust loading being applied on the motor rotation axis 3, bearing body 7 moves vertically, absorbs thrust loading.In addition,, limited the axial internal clearance of bearing body 7, can prevent that the 9a of flat spring portion of pressing element 9 from producing excessive shrinkage because the mobile restriction lug boss 20c that is arranged on the bearing body 7 contacts with the flat part 9c of pressing element 9.
In addition, the stepping motor 1 of present embodiment, owing to pressing element 9 is installed on the ways 8 by hook 9b is engaged with flange portion 8b, so easily this pressing element 9 is unloaded from ways 8, just pressing element 9, bearing body 7 can be unloaded, carry out the part transposing or the maintenance of stepping motor 1.In addition, because flange portion 8b is set, just need not that perforate is provided with recess on motor field frame on guiding parts 8.
In addition, because escape portion 10 is set on guiding parts 8, flat spring 9a contact with ways 8 and contact by flat spring 9a is escaped to this escape portion 10 with pellet shot from a slingshot maintenance body 20, just can guarantee the flat spring amount of having cut, simultaneously, make pressing element 9 and pellet shot from a slingshot keep the gap of body 20 to reach minimum.Therefore, by liner being set at pressing element 9 and 8 of wayss or the 9a of flat spring portion being implemented deep-draw processing etc., just can thrust bearing be pressurizeed not producing under the situation protruding, that the axial shape change is big.
In addition, present embodiment stepping motor 1, because forming makes the internal diameter f of guide part 8a equate with the inner diameter d of the cylindrical portion inner peripheral surface of stator department 2, so by being d with external diameter, for example transferring the core cylindrical shell, for example one one of axle shape type tool is inserted stator department 2, weld ways 8 being entrenched in contact with stator department 2 under the state on the part of not being inserted into of this cylindrical shell, can make the central shaft of stepping motor 1 consistent easily with the center of ways 8.But the inner diameter d of these radial dimensions and stator department 2 is unequal also passable.
In addition, in this stepping motor 1, because the rotor of motor rotation axis 3 is installed from the rear side of stator department 2, on motor 1, do not establish frame 16, even be set directly at the occasion on the member that stepping motor 1 is installed at bearing 5, can assemble the installation of carrying out rotor portions after the stepping motor 1 with supporting motor rotating shaft 3 front ends.
In addition, the foregoing description is of the present invention one embodiment preferably, but is not limited only to this example, in the present invention conceives scope various forms of implementation can be arranged.For example, the structure to stepping motor 1 in the present embodiment is illustrated, yet much less, structure of the present invention also is suitable for the general motor beyond the stepping motor.
Claims (7)
1. stepping motor, comprise motor rotation axis that stretches out from stator department and two thrust bearings that support described motor rotation axis, it is characterized in that, at least one thrust bearing is by the bearing body that above-mentioned motor rotation axis is moved vertically in this two bearings, have the pressing element that allows this bearing body to move vertically, simultaneously this is moved the ways of the guide part that leads and above-mentioned bearing body is carried out the elasticity pressurization towards described another thrust bearing direction and constitute, and described ways is fixed on the described stator department.
2. according to the described motor of claim 1, it is characterized in that described guiding parts is made of metal, and this guiding parts is with being weldingly fixed on the described stator department.
3. according to the described motor of claim 1, it is characterized in that on the circumferential edges of described guiding parts, forming flange portion, on described pressing element, form simultaneously the junction surface that engages to this flange portion, engage described pressing element by this product portion with described flange portion and be fixed.
4. according to claim 1 or 2 described motor, it is characterized in that described guide part internal diameter equates with the internal diameter of described stator department cylindrical shape inner peripheral surface.
5. according to claim 1 or 2 described motor, it is characterized in that described pressing element is made of the flat part that often contacts with described bearing body, flat spring portion and this flat spring portion of this bearing body elasticity pressurization have been cut.
6. according to the described motor of claim 5, it is characterized in that formation contacts restriction, the described ways mobile restriction jut of amount of movement vertically with described flat part on described ways.
7. according to the described motor of claim 5, it is characterized in that on described guide part, having for making escape portion that described flat spring portion escapes described flat spring portion contact with described guide part, and often contact, this bearing body elasticity is pressurizeed with described bearing body with this escape portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP072429/97 | 1997-03-25 | ||
| JP07242997A JP3379885B2 (en) | 1997-03-25 | 1997-03-25 | Stepping motor and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1194487A CN1194487A (en) | 1998-09-30 |
| CN1089201C true CN1089201C (en) | 2002-08-14 |
Family
ID=13489051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98105860 Expired - Fee Related CN1089201C (en) | 1997-03-25 | 1998-03-25 | Stepping motor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3379885B2 (en) |
| CN (1) | CN1089201C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3884926B2 (en) * | 2001-06-13 | 2007-02-21 | 日本電産サンキョー株式会社 | Motor and manufacturing method thereof |
| KR20030077206A (en) * | 2002-03-25 | 2003-10-01 | 삼성전기주식회사 | Stepping motor |
| JP4597015B2 (en) * | 2005-09-14 | 2010-12-15 | 日本電産サンキョー株式会社 | motor |
| JP4727467B2 (en) * | 2006-03-17 | 2011-07-20 | 日本電産サンキョー株式会社 | motor |
| KR101028241B1 (en) | 2009-12-31 | 2011-04-11 | 엘지이노텍 주식회사 | Stepping motor |
| JP6155068B2 (en) * | 2013-03-28 | 2017-06-28 | 日本電産サンキョー株式会社 | motor |
-
1997
- 1997-03-25 JP JP07242997A patent/JP3379885B2/en not_active Expired - Fee Related
-
1998
- 1998-03-25 CN CN 98105860 patent/CN1089201C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1194487A (en) | 1998-09-30 |
| JP3379885B2 (en) | 2003-02-24 |
| JPH10271793A (en) | 1998-10-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20020814 Termination date: 20170325 |