US20070169348A1 - Method of manufacturing a bearing unit, and a motor having loaded thereon the bearing unit - Google Patents

Method of manufacturing a bearing unit, and a motor having loaded thereon the bearing unit Download PDF

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Publication number
US20070169348A1
US20070169348A1 US11/626,441 US62644107A US2007169348A1 US 20070169348 A1 US20070169348 A1 US 20070169348A1 US 62644107 A US62644107 A US 62644107A US 2007169348 A1 US2007169348 A1 US 2007169348A1
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US
United States
Prior art keywords
circumferential surface
bearing unit
oil supplying
supplying component
inner circumferential
Prior art date
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.)
Abandoned
Application number
US11/626,441
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English (en)
Inventor
Satoshi Ueda
Tadayuki Kanatani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nidec Corp filed Critical Nidec Corp
Assigned to NIDEC CORPORATION reassignment NIDEC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KANATANI, TADAYUKI, UEDA, SATOSHI
Publication of US20070169348A1 publication Critical patent/US20070169348A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C17/00—Sliding-contact bearings for exclusively rotary movement
    • F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/10—Construction relative to lubrication
    • F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
    • F16C33/103—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49636—Process for making bearing or component thereof
    • Y10T29/49696—Mounting

Definitions

  • the present invention relates to a method of manufacturing a bearing unit having a long operating life, and to a motor including such a bearing unit.
  • An operating life of a bearing unit is an important element determining a length of an operating life of a motor having therein the bearing unit. Therefore, when oil runs out (e.g., by evaporation) of a bearing made of a sintered material impregnated with oil, the bearing unit will no longer operate. Thus, conventionally, a component for supplying oil has been used in order to extend the operating life of the bearing unit.
  • a long operating life is required for a motor used for a projector device (e.g., front-projection television, or rear-projection television) having applied therein DLP (Digital Light Processing) technology.
  • a projector device e.g., front-projection television, or rear-projection television
  • DLP Digital Light Processing
  • the aforementioned projector device is sometimes operated continuously for a long period of time, the temperature inside the projector device may increase, thereby evaporating the oil impregnated in the bearing.
  • a secure contact has to be made between the component and the bearing in order for the component to supply oil to the bearing in an appropriate manner. If a secure connection is not made, the operating life of the bearing unit will not be extended, and thus the motor having therein such a bearing unit will not have a long operating life.
  • preferred embodiments of the present invention provide a method of manufacturing a bearing unit in which a bearing and an oil supplying component are properly arranged with respect to each other.
  • the bearing unit manufactured by a method according to a preferred embodiment of the present invention achieves a long and stable operating life.
  • the preferred embodiments of the present invention also provide a motor including therein the bearing unit manufactured in accordance with the aforementioned method.
  • an oil supplying component makes contact with an outer circumferential surface of the sleeve so as to supply oil to the sleeve in an adequate manner.
  • a distance between a central axis and a most curved portion of the oil supplying component, which is roundly bent to have a “c” shape, is designed to be shorter than a radius of an inner circumferential surface of a housing of the bearing unit such that the oil supplying component is operable to supply the oil effectively.
  • FIG. 1 is a diagram schematically showing a projector device.
  • FIG. 2 is a schematic cross sectional view of a motor according to a preferred embodiment of the present invention.
  • FIG. 3 is a schematic cross sectional view of a bearing unit according to a preferred embodiment of the present invention.
  • FIGS. 4A to 4 C are schematic cross sectional views of oil supplying members according to various preferred embodiments of the present invention.
  • FIG. 5 is a schematic cross sectional view of a bearing unit according to yet another preferred embodiment of the present invention.
  • FIG. 6 is a schematic diagram showing a step of a method for manufacturing the bearing unit according to a preferred embodiment of the present invention.
  • FIG. 7 is a schematic diagram showing a step S 1 of a method for manufacturing the bearing unit according to a preferred embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing a step S 2 of a method for manufacturing the bearing unit according to a preferred embodiment of the present invention.
  • FIG. 9 is a schematic diagram showing a step S 3 of a method for manufacturing the bearing unit according to a preferred embodiment of the present invention.
  • FIG. 10 is a schematic diagram showing a step S 4 of a method for manufacturing the bearing unit according to a preferred embodiment of the present invention.
  • FIG. 11 is a schematic diagram showing a step S 5 of a method for manufacturing the bearing unit according to a preferred embodiment of the present invention.
  • FIG. 12 is a diagram showing a cross sectional view along line x-x in FIG. 8 .
  • FIG. 1 is a schematic diagram showing an entire structure of a display unit according to a preferred embodiment of the present invention.
  • the display unit is a projector device 1 having applied therein DLP technology.
  • the projector device 1 includes a color wheel assembly 3 in which a disc shaped color wheel 2 is attached to a rotor portion of a motor 3 a , a light source 4 emitting an optical light toward the color wheel 2 , a digital micro mirror device 5 (hereinafter, referred to as DMD 5 ) reflecting the optical light passing through the color wheel 2 , and a projection optical system 6 projecting the optical light from the DMD 5 to a predetermined screen 7 .
  • DMD 5 digital micro mirror device 5
  • the color wheel 2 has, for example, three equal amount of areas each representing a color (e.g., red (R), green (G), and blue (B)) and each having a filter allowing an optical light to pass therethrough.
  • the color wheel 2 rotates, due to the motor 3 a , at about 7200 rpm to about 14000 rpm.
  • the DMD 5 provides in a two dimensional manner a plurality of micro reflection mirrors whose tilt can be adjusted. Once the optical light passes through the color wheel 2 , the optical light having a predetermined frequency is transmitted in accordance with the frequency to predetermined reflection mirrors via a focusing lens 8 . Then, the optical light will be reflected to the projection optical system 6 or to a predetermined position in accordance with the tilt of each reflection mirror.
  • the projector device 1 projects an image (e.g., R image, G image, and/or B image) in accordance with the external signal, thereby projecting a color moving image on the screen 7 .
  • an image e.g., R image, G image, and/or B image
  • FIG. 2 is a schematic cross sectional view of the motor according to a preferred embodiment of the present invention.
  • the motor includes a rotor portion 10 which rotates about a central axis J 1 , a bearing portion 20 which supports the rotor portion 10 such that the rotor can freely rotate, and a stator portion 30 which retains the bearing portion 20 .
  • the rotor portion 10 includes a shaft 11 which rotates about the same axis as the central axis J 1 , a rotor hub 12 which has attached thereto the color wheel 2 (not shown in FIG. 2 ) and which is affixed on a top portion of the shaft 11 , a substantially cylindrically shaped yoke 13 which is made of a magnetic material and is affixed to the rotor hub 12 , and a rotor magnet 14 which is affixed to the yoke 13 .
  • the rotor hub 12 is made of a non magnetic material (e.g., aluminum). Also, the rotor hub 12 has a substantially cylindrical shape having an opening at a bottom portion thereof. An extension portion 12 b , which extends in a radially outward direction, is provided at a bottom portion of a cylinder portion 12 a . An attaching portion 12 b 1 is provided on a top surface of the extension portion 12 b . The color wheel 2 is to be attached to the attaching portion 12 b 1 .
  • the yoke 13 is affixed to a lower portion of an outer circumferential edge of the extension portion 12 b by a desired fixing process (e.g., caulking). Also, the rotor magnet 14 is affixed by an adhesive, for example, to an inner circumferential surface of the yoke 13 .
  • the bearing portion 20 includes a sleeve 21 which is made of a sintered material for rotatably supporting the shaft 11 , a housing 22 which retains the sleeve 21 , an oil supplying component 23 which is retained between the sleeve 21 and the housing 22 for supplying oil to the sleeve 21 , a thrust plate 24 which is made of a resin material having superior abrasion resistance and rotatably supports a bottom portion of the shaft 11 , and a substantially cup shaped lid portion 25 which retains the thrust plate 24 .
  • the stator portion 30 includes a stator 31 which is affixed on an outer circumferential portion of the housing 22 , a mounting board 32 which is affixed on a bottom surface of the housing 22 , a circuit board 33 which is affixed on a bottom surface of the mounting board 32 for controlling rotation of the rotor portion 10 , and a cable 34 which connects the stator portion 30 with an external power source (not shown in FIG. 2 ).
  • the cable 34 may be a Flexible Flat Cable (FFC) or a Flexible Printed Circuit (FPC).
  • the stator 31 includes a stator core 31 a which is formed by laminating a plurality of thin magnetic plates, and a coil 31 b coiling around the stator core 31 a . An end of the coil 31 b is electrically soldered to the circuit board 33 .
  • An electric current coming from the external power source is conducted through the cable 34 to the stator 31 and generates a magnetic field around the stator 31 . Due to an interaction between the generated magnetic field and the rotor magnet 14 , the rotor portion 10 gains a rotary force.
  • FIG. 3 shows a bearing unit 20 a .
  • FIG. 4A shows the oil supplying component 23 .
  • FIG. 4B shows an element prior to being formed into the oil supplying component 23 .
  • the oil supplying component 23 has a stick shape.
  • FIG. 4C also shows an element prior to being formed into the oil supplying component 23 .
  • the oil supplying component 23 has a ring shape.
  • the bearing unit 20 a includes the bearing portion 20 having inserted therein the shaft 11 .
  • the ring shaped indent portion 22 a which expands in a radial direction is provided on an upper portion of an inner circumferential surface of the housing 22 .
  • a top surface 22 a l of the indent portion 22 a forms an inclined surface wherein the surface extends in a radially upward and inward direction generating a tapered surface.
  • a bottom surface 22 a 2 of the indent portion 22 a defines, with respect to the central axis J 1 , a substantially perpendicular surface.
  • a ring shaped protruding portion 22 b is formed on a lower portion of an inner circumferential surface of the housing 22 which determines the axial position of the sleeve 21 .
  • An upper side bearing 21 a and a lower side bearing 21 b are respectively provided on an upper portion and a lower portion on an inner circumferential surface of the sleeve 21 .
  • the upper side bearing 21 a and the lower side bearing 21 b have a slightly smaller diameter than the rest of the inner circumferential surface of the sleeve 21 so as to rotatably support the outer circumferential surface of the shaft 11 .
  • the outer circumferential surface of the sleeve 21 makes contact with the inner circumferential surface of the housing 22 above and below the indent portion 22 a .
  • the oil supplying component 23 is located in a space generated between the indent portion 22 a and the outer circumferential surface of the sleeve 21 .
  • a leveled portion 22 c is provided below the protruding portion 22 b .
  • a ring shaped plate 26 is provided below the protruding portion 22 b .
  • the lid portion 25 is affixed to a portion of a bottom surface of the leveled portion 22 c by a desired fixing process (e.g., caulking).
  • a desired fixing process e.g., caulking
  • an upper end extension portion 25 a is arranged which extends in a radially outward direction.
  • the plate 26 is secured between the upper end extension portion 25 a and the bottom surface of the protruding portion 22 b .
  • an oval shaped elevated portion 25 b is provided on an upward end surface of the lid portion 25 .
  • the thrust plate 24 is located on a top surface of the elevated portion 25 b.
  • the shaft 11 which will be inserted in the sleeve 21 has a substantially cylindrical shape. At a lower portion of the shaft 11 , a reduced circumference portion 11 a is provided having a reduced circumference than the rest of the shaft 11 . Further, a bottom end portion 11 b of the shaft 11 has a substantially circular arc shape. A tip portion at the end of the arc shape slides on the thrust plate 24 , and is rotatably supported in the axial direction.
  • an inner circumferential surface of the plate 26 is located closer to the central axis J 1 than the inner circumferential surface of the protruding portion 22 b . Also, the inner circumferential surface of the plate 26 is located radially inwardly from the outer circumferential surface of the shaft 11 , and radially outwardly from the outer circumferential surface of the reduced circumference portion 11 a .
  • the protruding portion 22 b and the plate 26 define a mechanism to prevent the shaft 11 from coming out of the bearing unit.
  • a washer 27 is provided at a top surface of the sleeve 21 so that the oil which travels along the shaft 11 in an upward direction will be directed back to the sleeve 21 .
  • the oil supplying component 23 whose axial position is determined by a position of the bottom surface 22 a 2 is a component made of a textile material (e.g., felt) which has been soaked with oil.
  • the oil supplying component 23 is formed by cutting a strip of the textile material into a plurality of substantially quadrangular prism shaped bars. If the oil supplying component 23 is formed as shown in FIG. 4C in which a ring shaped component is cut out of the strip of the textile material, the rest of the strip will go to waste. That is, by forming the oil supplying component 23 having the substantially quadrangular prism shaped bars as shown in FIG. 4A , the material will be used efficiently. Also, since the textile material for the oil supplying component 23 is a flexible material, the bar shaped oil supplying component 23 can be roundly bent so as to form a “c” shape as shown in FIG. 4A .
  • FIGS. 5 and 6 elements similar to those shown in FIG. 3 are denoted by similar reference numerals, and description thereof is omitted. Also, a housing shown in FIG. 5 will be denoted as housing 40 , and that shown in FIG. 6 will be denoted as housing 50 .
  • the oil supplying component 23 is located axially lower than as shown in FIG. 3 .
  • a shape of the indent portion 41 of the housing 40 is such that a top surface of the indent portion 41 is substantially perpendicular with respect to the central axis J 1 , and a bottom surface of the indent portion 41 forms an inclined surface 41 b wherein the bottom surface extends in a radially downward and inward direction generating a tapered surface.
  • the outer circumferential surface of the sleeve 21 makes contact with a lower portion of the inner circumferential surface of the housing 50 below the indent portion 51 .
  • the outer circumferential surface of the sleeve 21 makes contact with the inner circumferential surface of the housing 40 above the indent portion 41 .
  • FIGS. 7 through 11 each show a schematic diagram illustrating a manufacturing step of the bearing unit 20 a .
  • FIG. 12 is a diagram showing a cross sectional view of what is shown in FIG. 8 as viewed from a line x-x.
  • the oil supplying component 23 is inserted through an opening in the top surface 22 a 1 (see step S 1 in FIG. 7 ).
  • the oil supplying component 23 is roundly bent prior to being inserted. Due to the inclined surface formed at the top surface 22 a 1 , the roundly bent oil supplying component 23 will be allowed to be restored within the indent portion 22 a .
  • the aforementioned step S 1 allows the oil supplying component 23 to be easily fixed at a predetermined axial position, thereby increasing an efficiency of the manufacturing process.
  • oil is provided to the oil supplying component 23 (see step S 2 in FIG. 8 ).
  • the oil supplying component 23 is already soaked with oil prior to being inserted into the indent portion 22 a , the oil maybe spilled before insertion.
  • An oil supplying component 23 not having an adequate amount of oil may shorten the operating life of the bearing unit. Therefore, it is important to insert the oil supplying component 23 which is not soaked with oil into the indent portion 22 a in order to prevent the aforementioned problem.
  • the oil supplying component 23 can be ring shaped, for example.
  • D 1 which is a line connecting the central axis J 1 and a center portion 23 b having the highest curvature in the roundly bent oil supplying component 23 is designed to be shorter than D 2 which is a radius connecting the central axis J 1 and a given point of an imaginary circle of the oil supplying component 23 .
  • D 2 which is a radius connecting the central axis J 1 and a given point of an imaginary circle of the oil supplying component 23 .
  • H which is a radial thickness of the oil supplying component 23 preferably equals H 2 which is a radial depth of the indent portion 22 a.
  • a large restoring force is a force acting upon the roundly bent oil supplying component 23 , which is originally straight, so as to undo the bent shape. Due to the large restoring force, the inner circumferential surface of the center portion 23 b will be positioned closer to the central axis J 1 than the inner circumferential surface of the housing 22 .
  • H 1 the thickness of the oil supplying component 23
  • H 2 the radial depth of the indent portion 22 a
  • the oil supplying component 23 will extend out of the indent portion 22 a and may be damaged when being inserted therein.
  • H 1 is smaller than H 2
  • D 1 may become greater than the D 2 , and therefore the oil will not be supplied in an adequate manner since the inner circumferential surface of the oil supplying component 23 and the outer circumferential surface of the sleeve 21 will not make contact with each other.
  • H 1 and H 2 are designed to have an equal dimension, the dimensional tolerance will be varied only slightly.
  • the sleeve 21 is inserted into and affixed in the housing 22 (see step S 3 in FIG. 9 ).
  • the sleeve 21 is inserted into the housing 22 by press fitting. Since the sleeve 21 is inserted into the housing 22 by press fitting, the inner circumferential surface of the housing 22 and the outer circumferential surface of the sleeve 21 make contact with each other such that the inner circumferential surface of the oil supplying component 23 and the outer circumferential surface of the sleeve 21 fittingly make contact with each other.
  • An axial position of the sleeve 21 is determined in accordance with a position of a top surface of the protruding portion 22 b , and therefore, the axial position of the sleeve 21 is accurately determined.
  • step S 4 the plate 26 , the thrust plate 24 , and the lid portion 25 are affixed at the bottom portion of the housing (see step S 4 in FIG. 10 ).
  • the plate 26 is provided on a bottom surface of the protruding portion 22 b .
  • the thrust plate 24 is placed on the top surface of the elevated portion 25 b .
  • the lid portion 25 is affixed to the housing 22 by a desired fixing process (e.g., caulking).
  • the shaft 11 is inserted into the sleeve 21 (see step S 5 in FIG. 11 ).
  • the axial position of the shaft 11 is determined when the bottom end portion 11 b of the shaft 11 makes contact with the top surface of the thrust plate 24 .
  • An inner circumferential edge of the plate 26 is elastically deformed so as to allow the bottom end portion 11 b to pass therethrough. Then the shape of the inner circumferential edge of the plate 26 which is deformed when allowing the bottom end portion 11 b to pass therethrough is restored. As a result, a mechanism to prevent the shaft from coming off the bearing unit is provided.
  • the manufacturing method of the bearing unit as described above can be applied to the bearing unit as shown in FIGS. 5 and 6 .
  • the bottom surface 41 b of the indent portion 41 is the tapered surface, and therefore, the oil supplying component 23 for the bearing unit as shown in FIG. 5 is inserted through a bottom portion of the bearing unit.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Sliding-Contact Bearings (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US11/626,441 2006-01-24 2007-01-24 Method of manufacturing a bearing unit, and a motor having loaded thereon the bearing unit Abandoned US20070169348A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-014805 2006-01-24
JP2006014805A JP2007198420A (ja) 2006-01-24 2006-01-24 軸受ユニットの製造方法およびこの軸受ユニットを搭載したモータ

Publications (1)

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US20070169348A1 true US20070169348A1 (en) 2007-07-26

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US11/626,441 Abandoned US20070169348A1 (en) 2006-01-24 2007-01-24 Method of manufacturing a bearing unit, and a motor having loaded thereon the bearing unit

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US (1) US20070169348A1 (ja)
JP (1) JP2007198420A (ja)
CN (1) CN100552246C (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100156218A1 (en) * 2008-12-19 2010-06-24 Samsung Electro-Mechanics Co., Ltd. Spindle motor
CN105587776A (zh) * 2015-12-28 2016-05-18 肇庆晟辉电子科技有限公司 一种轴承系统
US10175475B2 (en) * 2016-04-28 2019-01-08 Nidec Corporation Rotary drive apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008043128A1 (de) * 2008-10-23 2010-04-29 Robert Bosch Gmbh Elektrische Maschine mit Rotorlagerung
CN111151977A (zh) * 2020-01-07 2020-05-15 松下·万宝(广州)压缩机有限公司 一种轴套制作方法、一种轴套和一种压缩机

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US3109684A (en) * 1961-09-18 1963-11-05 Gen Electric Lubrication arrangement for dynamoelectric machines
US3266123A (en) * 1965-04-07 1966-08-16 Heim Universal Corp Method of producing bearings
US4355250A (en) * 1980-07-17 1982-10-19 General Electric Company Self-aligning bearing assembly
US4674164A (en) * 1978-05-15 1987-06-23 Incom International Inc. Bearings with felted teflon liners and method for making same
US5880043A (en) * 1991-04-03 1999-03-09 Hoechst Aktiengesellschaft Fiber-reinforced material and production and use thereof
US5899572A (en) * 1996-04-10 1999-05-04 Johnson Electric S.A. Bearing assembly for a miniature motor
US6755554B2 (en) * 2000-05-25 2004-06-29 Matsushita Electric Industrial Co., Ltd. Color wheel assembly and color sequential display device using the same, color wheel unit and color sequential display device using the same, and color sequential display device
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GB2306583A (en) * 1995-10-28 1997-05-07 Daewoo Electronics Co Ltd Lubricated journal bearing assembly
JP3908834B2 (ja) * 1997-09-08 2007-04-25 Ｎｔｎ株式会社 情報機器のスピンドル用モータの支持装置
JP2001054250A (ja) * 1999-08-05 2001-02-23 Asmo Co Ltd モータの含油軸受装置、及びその製造方法
JP2003239972A (ja) * 2002-02-13 2003-08-27 Nippon Densan Corp 軸受装置、スピンドルモータ及びディスク装置
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US3070409A (en) * 1961-01-09 1962-12-25 Jakel Mfg Co Electrical motors
US3109684A (en) * 1961-09-18 1963-11-05 Gen Electric Lubrication arrangement for dynamoelectric machines
US3266123A (en) * 1965-04-07 1966-08-16 Heim Universal Corp Method of producing bearings
US4674164A (en) * 1978-05-15 1987-06-23 Incom International Inc. Bearings with felted teflon liners and method for making same
US4355250A (en) * 1980-07-17 1982-10-19 General Electric Company Self-aligning bearing assembly
US5880043A (en) * 1991-04-03 1999-03-09 Hoechst Aktiengesellschaft Fiber-reinforced material and production and use thereof
US5899572A (en) * 1996-04-10 1999-05-04 Johnson Electric S.A. Bearing assembly for a miniature motor
US6755554B2 (en) * 2000-05-25 2004-06-29 Matsushita Electric Industrial Co., Ltd. Color wheel assembly and color sequential display device using the same, color wheel unit and color sequential display device using the same, and color sequential display device
US20050104464A1 (en) * 2003-11-14 2005-05-19 Nidec Corporation Motor and display unit
US7109620B2 (en) * 2003-11-14 2006-09-19 Nidec Corporation Motor and display unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100156218A1 (en) * 2008-12-19 2010-06-24 Samsung Electro-Mechanics Co., Ltd. Spindle motor
CN105587776A (zh) * 2015-12-28 2016-05-18 肇庆晟辉电子科技有限公司 一种轴承系统
US10175475B2 (en) * 2016-04-28 2019-01-08 Nidec Corporation Rotary drive apparatus

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JP2007198420A (ja) 2007-08-09
CN101025201A (zh) 2007-08-29
CN100552246C (zh) 2009-10-21

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