WO2001034994A2 - Overmolded motor bearing - Google Patents

Overmolded motor bearing Download PDF

Info

Publication number
WO2001034994A2
WO2001034994A2 PCT/US2000/030867 US0030867W WO0134994A2 WO 2001034994 A2 WO2001034994 A2 WO 2001034994A2 US 0030867 W US0030867 W US 0030867W WO 0134994 A2 WO0134994 A2 WO 0134994A2
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
assembly
bearing sub
insulating
motor
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.)
Ceased
Application number
PCT/US2000/030867
Other languages
English (en)
French (fr)
Other versions
WO2001034994A3 (en
Inventor
Mark D. Williams
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Priority to JP2001536893A priority Critical patent/JP2003530526A/ja
Priority to DE10085191T priority patent/DE10085191T1/de
Priority to AU15939/01A priority patent/AU1593901A/en
Priority to GB0213167A priority patent/GB2374036B/en
Publication of WO2001034994A2 publication Critical patent/WO2001034994A2/en
Publication of WO2001034994A3 publication Critical patent/WO2001034994A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7886—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted outside the gap between the inner and outer races, e.g. sealing rings mounted to an end face or outer surface of a race
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1459—Coating annular articles
    • 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
    • F16C27/00—Elastic or yielding bearings or bearing supports, for exclusively rotary movement
    • F16C27/06—Elastic or yielding bearings or bearing supports, for exclusively rotary movement by means of parts of rubber or like materials
    • F16C27/066—Ball or roller bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings

Definitions

  • the present invention relates to bearings for electrically powered devices and in particular to a bearing for supporting the armature shaft of a motor in a power tool that is double-insulated to meet applicable safety standards.
  • the present invention proposes a conventional ball-bearing that has a rubberized sleeve molded directly onto the bearing so that the bearing and insulating rubber boot form a unitary subassembly.
  • the bearing is inserted directly into the mold and the rubberized material is injection molded around the bearing.
  • the rubberized material encapsulating the bearing extends around the outer bearing race and along the side faces of the bearing.
  • separate nylon washers are installed on either side of the bearing when the bearing is inserted into the mold.
  • the rubberized material is then injection molded around the outer bearing race to capture the nylon washers.
  • the preferred embodiment thus prevents the bearing shields on the side faces of the bearing from being subjected to the injection molding pressures within the mold which can deform and thus damage the bearing shields.
  • Fig. 1 is a sectional view of a first embodiment of a bearing assembly according to the present invention
  • Fig. 2 is a sectional view of a second preferred embodiment of a bearing assembly according to the present invention.
  • Fig. 3 is an enlarged partial section view of the preferred embodiment o the bearing assembly shown in Fig. 2 and illustrated on the end of the armature shaft of a motor.
  • the motor bearing assembly 10 comprises a conventional ball bearing subassembly 12 having an inner race 14, an outer race 16, and a plurality of balls 18 captured therebetween.
  • the inner race 14 of the bearing 12 is adapted to be fitted onto the armature shaft of a motor (not shown), and the entire bearing assembly is intended to be mounted in the tool housing so that the armature shaft of the motor is rotationally supported relative to the tool housing.
  • Encapsulating the outer bearing race 16 and extending along the side faces of the bearing 12 is an integrally molded sleeve or boot 20 which, in the preferred embodiment, is made of a synthetic rubber material.
  • the rubber boot 20 is formed around the bearing 12 by inserting the bearing directly into a suitably shaped mold of an injection molding machine.
  • the synthetic rubber compound injected into the mold encapsulates the bearing as shown so that the resulting bearing assembly comprises a unitary assembly that increases assembly efficiency of the bearings onto the motor armature shaft and then into the tool housing.
  • the overmolded rubberized material is formed around the bearing along its side faces so as to extend substantially to the inner race 14 of the bearing 12. This is required to ensure that the bearing assembly meets applicable safety standard for double insulated electrical appliances, such as a.c. power tools.
  • the rubber overmold 20 In order for the rubber overmold 20 to extend along the side faces of the bearing 12 as shown, it is necessary for the side faces of the bearing to be exposed to the internal mold pressures associated with the injection molding process. For motor bearings having bearing shields between the inner 14 and the outer 16 races to keep ball grease in and dirt and debris out, the pressures of the injection molding process may damage the bearing shields.
  • the overmolded rubberized material 20 extends only around the sides of the outer race 16 a distance sufficient to capture a pair of plastic washers 22 located on either side of the bearing.
  • the plastic washers 22 are placed on either side of the bearing 12 when positioned in the mold.
  • the synthetic rubber compound 20 is then molded around the bearing 12 so as to completely cover the outer race 16 and capture the washers 22 to hold them in place.
  • the overmolded rubber material it is not necessary in this embodiment for the overmolded rubber material to extend significantly along the side faces of the bearing 12.
  • the plastic washers 22 nonetheless serve to electrically insulate the side faces of the bearing from the surrounding metallic components of the motor as required to meet applicable safety standards for double-insulated electrical appliances.
  • FIG. 3 an enlarged sectional view of the bearing assembly 10' located on the armature shaft 26 of a motor 24 is shown.
  • the presence of the plastic washers 22 ensures that the required current path through air between the motor bearing 12 and the adjacent commutator bar 28 of the motor 24 meets applicable safety standards for double- insulated electrical appliances.
  • the current path without the insulating sleeve as shown at 32 is approximately 5mm; whereas the current path for the overmolded bearing assembly in accordance with the present invention as shown at 34 exceeds 8mm as required by the known U.L. standard. While the above description was provided with reference to the U.L. safety standard, it readily understood that the principles embodied in the present invention may be used to meet a variety of applicable safety standards.
  • an integrally overmolded bearing assembly for rotationally supporting the armature shaft of an electric motor is shown that eliminates the need for installing a separate rubber boot onto the bearing to meet the safety requirements of double-insulated electrical appliances.
  • the bearing assembly includes an integrally overmolded rubberized boot, the assembly problems associated with installing a separate boot onto the bearing and then preventing the bearing from becoming separated from the boot during assembly of the bearing into the tool housing are avoided.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Frames (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Rolling Contact Bearings (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Support Of The Bearing (AREA)
PCT/US2000/030867 1999-11-12 2000-11-10 Overmolded motor bearing Ceased WO2001034994A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2001536893A JP2003530526A (ja) 1999-11-12 2000-11-10 オーバーモールドモータベアリング
DE10085191T DE10085191T1 (de) 1999-11-12 2000-11-10 Überformtes Motorlager
AU15939/01A AU1593901A (en) 1999-11-12 2000-11-10 Overmolded motor bearing
GB0213167A GB2374036B (en) 1999-11-12 2000-11-10 Overmolded motor bearing

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US16516499P 1999-11-12 1999-11-12
US60/165,164 1999-11-12
US09/710,552 2000-11-09
US09/710,552 US6517251B1 (en) 1999-11-12 2000-11-09 Overmolded motor bearing and method of making same

Publications (2)

Publication Number Publication Date
WO2001034994A2 true WO2001034994A2 (en) 2001-05-17
WO2001034994A3 WO2001034994A3 (en) 2001-11-22

Family

ID=26861161

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/030867 Ceased WO2001034994A2 (en) 1999-11-12 2000-11-10 Overmolded motor bearing

Country Status (7)

Country Link
US (1) US6517251B1 (enExample)
JP (1) JP2003530526A (enExample)
CN (1) CN1390163A (enExample)
AU (1) AU1593901A (enExample)
DE (1) DE10085191T1 (enExample)
GB (1) GB2374036B (enExample)
WO (1) WO2001034994A2 (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102189195A (zh) * 2010-03-16 2011-09-21 上海菲特尔莫古轴瓦有限公司 自动进出料轴瓦冲孔模
EP2722547A1 (en) * 2012-10-22 2014-04-23 General Electric Company Insulated bearing ring
WO2016116869A1 (en) * 2015-01-20 2016-07-28 Dem Automazioni S.R.L. Pressing wheel
CN114026345A (zh) * 2019-06-26 2022-02-08 Abb瑞士股份有限公司 具有绝缘套筒和模块的耐磨轴承构造

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003207032A (ja) * 2002-01-15 2003-07-25 Denso Corp 回転体
ATE369498T1 (de) * 2004-06-18 2007-08-15 Electrolux Home Prod Corp Lagerträger für ein lüftergehäuse und verfahren zu dessen herstellung
TWI302780B (en) * 2005-05-27 2008-11-01 Delta Electronics Inc Motor mechanism with two-direction buffering function
US20090021859A1 (en) * 2007-07-19 2009-01-22 Seagate Technology Llc Overmolded motor hub
CN201490811U (zh) * 2009-08-05 2010-05-26 德昌电机(深圳)有限公司 汽车自动变速箱及其电机
DE102010030494A1 (de) * 2010-06-24 2011-12-29 Robert Bosch Gmbh Ankerwellenlagereinheit
CN204094755U (zh) 2011-06-29 2015-01-14 英格索尔-兰德公司 动力工具罩和动力工具
CN105281478A (zh) * 2014-07-22 2016-01-27 抚顺煤矿电机制造有限责任公司 一种轴承绝缘结构
CN106838006A (zh) * 2017-01-23 2017-06-13 苏州诺纳可电子科技有限公司 一种机电设备用轴承
US10563698B2 (en) * 2017-09-05 2020-02-18 Schaeffler Technologies AG & Co. KG Bearing assembly with an integrated seal
US12224644B2 (en) 2020-05-06 2025-02-11 Parker-Hannifin Corporation Motor bearing preloading system with plastic endbells configured to preload the bearing assemblies
KR102553662B1 (ko) * 2022-06-30 2023-07-12 조범종 베어링 외륜이 내장된 베어링 하우징 및 이를 포함하는 차량의 보조발판 시스템

Family Cites Families (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1066059B (enExample) 1956-07-19 1959-09-24
US3424508A (en) 1966-08-30 1969-01-28 Caterpillar Tractor Co Mounting means for high speed bearings
US3415500A (en) 1966-09-21 1968-12-10 Fafnir Bearing Co Combined seal and shock mount for a bearing
US3495887A (en) 1968-09-11 1970-02-17 Gen Motors Corp High capacity bearing
US4017128A (en) 1976-02-17 1977-04-12 Kendale Industries, Inc. Ball bearing assembly
US4229055A (en) 1978-06-15 1980-10-21 Skf Kugellagerfabriken Gmbh Vibration-absorbing antifriction bearing, especially for a driveshaft of a motor vehicle
EP0050213B1 (de) * 1980-10-18 1984-08-08 SKF GmbH Selbstausrichtende Lagerung
HU188034B (en) 1983-10-03 1986-03-28 Egetoe,Csaba,Hu Bearing block particularly for supporting in bearings the rollers of band conveyor
US4603025A (en) * 1984-07-25 1986-07-29 Brookfield Athletic Shoe Company, Inc. Method for pour casting roller skate wheel
DE3634383A1 (de) 1986-10-09 1988-04-21 Skf Gmbh Ringfoermiges maschinenteil
JPS63107433A (ja) * 1986-10-23 1988-05-12 Fuji Electric Co Ltd 小形モ−タの固定子ハウジング
KR930005345B1 (ko) * 1986-10-23 1993-06-17 후지덴기 가부시기가이샤 소형모터의 고정자 하우징과 회전자
US4758101A (en) 1987-05-13 1988-07-19 Xerox Corporation Bearing mounting
US5660481A (en) * 1987-05-29 1997-08-26 Ide; Russell D. Hydrodynamic bearings having beam mounted bearing pads and sealed bearing assemblies including the same
EP0301130B1 (de) 1987-07-25 1992-03-25 Firma Carl Freudenberg Wälzlagerung
JPH01174427A (ja) * 1987-12-28 1989-07-11 Koyo Seiko Co Ltd スピンドルハウジングの成形方法
JPH0397512A (ja) * 1989-09-12 1991-04-23 Bando Chem Ind Ltd 電気絶縁軸受用外輪の製造方法
US5161903A (en) 1990-10-03 1992-11-10 The Zeller Corporation Intermediate drive shaft support utilizing a standard bearing
DE4033592A1 (de) 1990-10-23 1992-05-07 Gkn Automotive Ag Elastisches mittellager fuer eine laengswelle
EP0604435B1 (en) * 1991-09-11 1998-09-02 Seagate Technology, Inc. 1.8" winchester drive card
JPH0538420U (ja) * 1991-10-28 1993-05-25 エヌテイエヌ株式会社 電食防止型転がり軸受
JP2560391Y2 (ja) * 1991-10-31 1998-01-21 日本精工株式会社 絶縁形転がり軸受
US5305169A (en) * 1992-06-04 1994-04-19 Hewlett-Packard Company Rotary actuator disk drive
JPH0617818A (ja) * 1992-06-30 1994-01-25 Tokai Rubber Ind Ltd 摺動型継手装置およびその製作方法
JPH07238939A (ja) * 1994-02-25 1995-09-12 Nippon Seiko Kk 電食防止転がり軸受とその製造装置
JP3579917B2 (ja) * 1994-05-19 2004-10-20 日本精工株式会社 電食防止転がり軸受
JP3301873B2 (ja) * 1994-11-18 2002-07-15 光洋精工株式会社 樹脂巻き部品の成形方法
US5650896A (en) * 1995-05-17 1997-07-22 Quantum Corporation Low cost plastic overmolded rotary voice coil actuator
JPH0956110A (ja) * 1995-08-09 1997-02-25 Minebea Co Ltd 複合軸受装置を備えるモータ
US5961222A (en) * 1996-03-29 1999-10-05 Nsk Ltd. Anti-electrolytic corrosion rolling bearing
JPH1037949A (ja) * 1996-07-19 1998-02-13 Ntn Corp 絶縁転がり軸受
JP3136278B2 (ja) * 1997-02-14 2001-02-19 ミネベア株式会社 モータ
JPH10227310A (ja) * 1997-02-14 1998-08-25 Minebea Co Ltd 複列軸受装置
JP3738556B2 (ja) * 1997-05-12 2006-01-25 日本精工株式会社 電食防止転がり軸受
US5943776A (en) * 1997-09-24 1999-08-31 Shop Vac Corporation Motor shaft assembly method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102189195A (zh) * 2010-03-16 2011-09-21 上海菲特尔莫古轴瓦有限公司 自动进出料轴瓦冲孔模
EP2722547A1 (en) * 2012-10-22 2014-04-23 General Electric Company Insulated bearing ring
WO2016116869A1 (en) * 2015-01-20 2016-07-28 Dem Automazioni S.R.L. Pressing wheel
CN114026345A (zh) * 2019-06-26 2022-02-08 Abb瑞士股份有限公司 具有绝缘套筒和模块的耐磨轴承构造
CN114026345B (zh) * 2019-06-26 2024-03-22 Abb瑞士股份有限公司 具有绝缘套筒和模块的耐磨轴承构造

Also Published As

Publication number Publication date
AU1593901A (en) 2001-06-06
WO2001034994A3 (en) 2001-11-22
CN1390163A (zh) 2003-01-08
GB2374036B (en) 2004-02-04
JP2003530526A (ja) 2003-10-14
US6517251B1 (en) 2003-02-11
DE10085191T1 (de) 2002-11-07
GB0213167D0 (en) 2002-07-17
GB2374036A (en) 2002-10-09

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