EP0859917A1 - Palier, notamment pour machine electrique - Google Patents

Palier, notamment pour machine electrique

Info

Publication number
EP0859917A1
EP0859917A1 EP97918913A EP97918913A EP0859917A1 EP 0859917 A1 EP0859917 A1 EP 0859917A1 EP 97918913 A EP97918913 A EP 97918913A EP 97918913 A EP97918913 A EP 97918913A EP 0859917 A1 EP0859917 A1 EP 0859917A1
Authority
EP
European Patent Office
Prior art keywords
bearing
lubricant
centrifugal disc
drive shaft
edge
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.)
Withdrawn
Application number
EP97918913A
Other languages
German (de)
English (en)
Inventor
Gerd DORNHÖFER
Hartmut Nitzsche
Bernd Wieland
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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
Priority claimed from DE19725970A external-priority patent/DE19725970A1/de
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0859917A1 publication Critical patent/EP0859917A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H02K5/1672—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at both ends of the rotor
    • 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
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/02—Sliding-contact bearings
    • F16C23/04—Sliding-contact bearings self-adjusting
    • 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
    • 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
    • F16C33/74—Sealings of sliding-contact bearings
    • 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
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

Definitions

  • the invention relates to a bearing, in particular for an electrical machine, with a drive shaft mounted in a housing according to the preamble of claim 1.
  • the invention is based on an arrangement according to the type of the main claim. Such is known from the
  • a spherical cap made of sintered material is used to mount a drive shaft of an electrical machine, to which a depot for lubricant for lubricating the bearing is assigned.
  • a thrust washer or cover disk which consists of a first fixed, annular disk part and a second elastic disk part connected to it in a form-fitting manner.
  • the fixed disc part has two circumferential centrifugal edges facing the spherical cap.
  • the sintered material used for the spherical cap has the property that the lubricant is stored due to the capillary effect of the existing cavities and is released to the drive shaft during operation due to pressure differences.
  • the drive shaft is lubricated so that it is supported in the calotte with low friction and wear.
  • the sintered bearing being heated during operation of the electrical machine, it can lerdings come to an increase in volume of the stored lubricant, so that it can exit axially laterally from the sintered bearing.
  • Such lubricant escaping during operation is thrown over the centrifugal edges onto the bearing housing and from there returned to the calotte.
  • the arrangement allows a secure sealing of the bearing even with larger assembly tolerances.
  • the two-part design of the centrifugal disc requires increased manufacturing and assembly costs.
  • US Pat. No. 4,711,590 discloses a bearing device for mounting the drive shaft of an electrical machine with a centrifugal disc made in one piece from a solid material.
  • the bearing arrangement is separated by a housing from rotating parts arranged on the drive shaft.
  • a bearing with the features of the main claim. Due to the one-piece design of the centrifugal disc made of an elastic material, it can also be produced inexpensively and easily, even with complex geometries. The flexibility of the centrifugal disc facilitates its assembly, so that the bearing is easy to assemble overall is. A thermoplastic elastomer is expediently used to manufacture the centrifugal disc.
  • the bearing is designed towards the centrifugal disc in such a way that any lubricant which is thrown away from the centrifugal disc is thrown back directly onto the bearing.
  • Figure 1 is a sectional view through the bearing area of a permanently excited DC motor
  • Figure 2 is a sectional view through a bearing
  • Figure 3 is a sectional view through a sealing element
  • FIG 4 is an enlarged detail view of the sealing element according to Figure 3 and
  • Figure 5 is a plan view of the sealing element.
  • FIG. 1 shows a sectional illustration of the bearing area of a permanently excited DC motor 10 on the commutator side.
  • the DC motor 10 has a drive shaft 14, which is mounted within a housing 12 and carries a commutator 16 and a rotor 18.
  • the drive shaft 14 is supported in a sintered bearing 20.
  • the sintered bearing 20 is arranged in a recess 22 of a bearing shell 24.
  • the bearing shell 24 is firmly connected to the housing 12. Further details of the DC motor 10 will not be dealt with in more detail in the context of the present description, since the structure and mode of operation of a DC motor are generally known. Only the parts essential to the invention are explained in more detail below.
  • a sealing element 26 is fixedly arranged on the drive shaft 14, so that it also rotates when the drive shaft 14 rotates.
  • the sealing element 26 is formed by a centrifugal disc 28.
  • the centrifugal disc 28 consists entirely of an elastic material, preferably a thermoplastic elastomer.
  • the sintered bearing 20 is fixed in the recess 22 and is held by a clamp 30.
  • the clamp 30 forms a fastening flange 32 which is fastened to the bearing shell 24 by means of a fastening means 34.
  • the clamp 30 also forms a receptacle 36 which bears against the sintered bearing 20 and fixes it in the recess 22 of the bearing shell 24.
  • a section 38 of the clamp 30 connecting the fastening flange 32 to the receptacle 36 is designed such that a cavity 40 results between the section 38 and the bearing shell 24, which is filled with a lubricant 42 in the form of oil in an inorganic or organic consistency generator filled is.
  • the lubricant 42 serves as a reserve depot for lubricant known to be stored in the sintered bearing 20. Due to the porosity of the sintered material of the sintered bearing 20, a lubricant can be deposited there by impregnation, which is stored in the sintered bearing 20 due to a capillary action.
  • the sintered bearing 20 has a base body 44, which is essentially cylindrical.
  • the base body 44 has a through opening 46 which serves to receive the drive shaft 14.
  • a diameter of the through opening 46 essentially corresponds to a diameter of the drive shaft 14, so that it can be supported in accordance with the operating conditions, for example the temperature range, and the bearing play corresponding to the lubricant used.
  • the outer jacket 48 of the base body 44 has flats 52 running on an imaginary circular line 50, the contour of which corresponds to the circular line 50, on the one hand being adapted to the receptacle 22 of the bearing shell 24 and the receptacle 36 of the clamp 30.
  • the base body 44 has, at least on its side facing the commutator 16, an axial depression 54, the diameter d of which is greater than a diameter of the passage opening 46 and which is, however, smaller than the diameter of the base body 44 in the region of the flats 52 the passage opening 46 is quasi made into a smaller-diameter section and a larger-diameter section passing over an annular step 56 in the region of the recess 54.
  • the drive shaft 14 is supported exclusively in the smaller-diameter area of the through opening 46.
  • the formation of the recess 54 thus results in the formation of a free space 58 which is separated from the ring step 56, the drive shaft 14, a lateral surface 60, the recess 54 and the like Sealing element 26 is limited.
  • a transition of the ring step 56 into the lateral surface 60 can preferably take place under a radius.
  • the centrifugal disc 28 is shown in more detail, with a sectional view being shown in FIG. 3 and an enlarged, partial view of the sectional view being shown in FIG. 4.
  • the centrifugal disc 28 consists of a concave curved disc 62, the cavity of which points in the direction of the sintered bearing 20. It consists entirely of an elastic material, which is chosen so that shock noises, which are generated by striking the bearing against the disc with an axially excited shaft, are damped.
  • the centrifugal disc 28 rests on the shaft in the form of an elastic press fit, which additionally prevents oil migration along the shaft.
  • the disk 62 has an outer bead 64 and an inner bead 66.
  • the inner bead 66 encompasses a through opening 68, the diameter of which corresponds to the diameter of the drive shaft 14.
  • a lateral surface 70 of the through opening 68 has an annular groove 72 which forms a sealing seat with the drive shaft 14.
  • the inner bead 66 has on its outer lateral surface 74 a further annular groove 76, which is formed by an axially protruding edge 78 and an edge 82 protruding at an angle a to an axial 80.
  • the axial extent of the edge 78 is chosen to be greater than the axial extent of the edge 82, so that one is in the from the jacket 62 of the centrifugal disc 28, the cavity 84 extends into an annular, nose-shaped projection 86.
  • a diameter d of the lateral surface 74 is smaller than the diameter d of the depression 54 of the sintered bearing 20.
  • the plan view of the centrifugal disc 28 shown in FIG. 5 clearly shows that the annular groove 76 completely surrounds the through opening 68.
  • the projecting edge 78 of the annular groove 76 is arranged at a distance from the through opening 68, so that a radially extending annular surface 88 results.
  • the annular surface 88 runs through the formation of the edges 78 and 82 at an axial distance a from the projection 86.
  • the distance a is chosen to be less than a depth t of the depression 54 of the sintered bearing 20 (FIG. 2).
  • the centrifugal disc 28 with a corresponding undersize to the shaft is pushed onto the drive shaft 14 to such an extent that it bears against the commutator 16.
  • the annular surface 88 of the centrifugal disc 28 bears against the annular step 56 of the sintered bearing 20. The result of this is that the annular groove 76 runs within the free space 58, the projection 86 ending in the free space and being at a distance a from the annular step 56.
  • the drive shaft 14 rotates simultaneously inside the sintered bearing 20, a lubricating film being generated between the sintered bearing 20 and the drive shaft 14 due to the lubricant stored in the sintered bearing 20, so that the drive shaft 14 is supported with low friction.
  • the sintered bearing 20 may be heated as a result of internal or external influences not to be considered here.
  • the stored lubricant experiences an increase in volume, which can be, for example, 10 to 15%. This occurs due to this increase in volume
  • Lubricant axially from the sintered bearing 20 and strikes the centrifugal disc 28.
  • the centrifugal disc 28 lying tightly on the drive shaft 14, the sealing action being reinforced by the annular groove 72 in the lateral surface 70 resting on the drive shaft 14, the escaping Lubricants do not pass the centrifugal disc 28 in the direction of the commutator 16.
  • the escaping lubricant passes through the contact seat formed by the annular step 56 of the sintered bearing 20 and the annular surface 88 of the centrifugal disc 28 and travels in the direction of the free space 58. There it migrates along the axially protruding edge 78 into the annular groove 76.
  • the capillary effect causes that the escaping lubricant is held in the annular groove 76. If the amount of lubricant emerging axially from the sintered bearing 20 increases, the edge 82 protruding at an angle ⁇ forms a creeping barrier, so that the annular groove 76 continues to fill up with the lubricant to a maximum. If the absorption capacity of the annular groove 76 is exceeded, the lubricant is thrown off via the projection 86 as a result of the centrifugal forces arising from the rotation of the centrifugal disc 28. According to the choice of the angle ⁇ , the is preferably 45 °, the lubricant is thrown off into the free space 58. Since the distance a is less than the depth t, the lubricant in the free space 58 hits the annular step 56 or the lateral surface 60 of the recess 54. As a result of the capillary action of
  • Sintered material of the sintered bearing 20 the lubricant impinging on the base body 44 of the sintered bearing 20 can be absorbed again by the sintered bearing 20 and reused for the lubrication of the sintered bearing 20. Overall, this results in a closed lubricant circuit which prevents lubricants from escaping outside the sintered bearing 20 or the cavity 84 encompassed by the disk 62. This on the one hand prevents contamination of the interior of the housing 12 of the direct current motor 10 and the lubricant supply of the sintered bearing 20 is constantly replenished, so that maintenance-free operation is possible overall. Impairment of the electrical functionality of the DC motor 10 by the formation of a lubricant-carbon paste on the commutator 16 is also avoided.
  • the elastic centrifugal disc 28 has on its outer bead 64 a further annular groove 90, which is opened radially in the direction of the drive shaft 14 and which serves as a safety collecting space for lubricants which may eventually escape from the free space 58 due to extreme operating situations serves. In this case, the lubricant is reliably prevented from entering the interior of the DC motor 10.
  • the invention is of course not limited to the illustrated embodiment.
  • the combination according to the invention of the sintered bearing 20 with the elastic centrifugal disc 28 can also be used in any other bearing in order to achieve the closed lubricant circuit.
  • another bearing lubricated with lubricant can also be provided.
  • the applications of the bearings are also not limited to electrical machines.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

La présente invention concerne un palier (20) à graissage par lubrifiant, destiné à un arbre de commande, notamment pour une machine électrique. Entre le palier (20) et les pièces à rotation montées sur l'arbre de commande se trouve un élément d'étanchéité (26) vis-à-vis du lubrifiant sortant du palier, en forme de disque centrifuge qui refoule vers le palier (20) le lubrifiant qui s'en échappe, en sorte que le lubrifiant circule en circuit fermé. Le disque centrifuge (28) est entièrement fabriqué dans un matériau élastique. Le lubrifiant éjecté par le disque centrifuge est renvoyé directement dans le palier (20).
EP97918913A 1996-09-24 1997-08-28 Palier, notamment pour machine electrique Withdrawn EP0859917A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19639082 1996-09-24
DE19639082 1996-09-24
DE19725970 1997-06-19
DE19725970A DE19725970A1 (de) 1996-09-24 1997-06-19 Lager, insbesondere für eine elektrische Maschine
PCT/DE1997/001866 WO1998013610A1 (fr) 1996-09-24 1997-08-28 Palier, notamment pour machine electrique

Publications (1)

Publication Number Publication Date
EP0859917A1 true EP0859917A1 (fr) 1998-08-26

Family

ID=26029712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97918913A Withdrawn EP0859917A1 (fr) 1996-09-24 1997-08-28 Palier, notamment pour machine electrique

Country Status (4)

Country Link
US (1) US6008557A (fr)
EP (1) EP0859917A1 (fr)
BR (1) BR9706766A (fr)
WO (1) WO1998013610A1 (fr)

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DE60033457T2 (de) * 1999-03-30 2007-05-31 Mabuchi Motor Co., Ltd., Matsudo Kleinstmotor und sein Herstellungsverfahren
DE10102014C2 (de) * 2001-01-18 2002-12-12 Bosch Gmbh Robert Anker
DE10121769A1 (de) * 2001-05-04 2002-12-05 Bosch Gmbh Robert Maschinengehäuse
US6663110B2 (en) 2001-12-12 2003-12-16 Meritor Heavy Vehicle Technology Llc Hydrophobic shaft seal
US20030173156A1 (en) * 2002-03-14 2003-09-18 Borcherding Gary W. Lubricant retention assembly
US6880223B2 (en) 2002-04-25 2005-04-19 Milwaukee Electric Tool Corporation Grease slinger
US6979922B2 (en) * 2003-10-21 2005-12-27 Siemens Vdo Automotive Inc. Commutator with integral oil throw and recovery structure
US7102266B2 (en) * 2005-02-08 2006-09-05 Ametek, Inc. Motor assembly with a sealed commutator/brush interface
US7258491B2 (en) * 2005-06-07 2007-08-21 Deere & Company Bearing seal assembly for agricultural applications
US10683865B2 (en) 2006-02-14 2020-06-16 Air Squared, Inc. Scroll type device incorporating spinning or co-rotating scrolls
GB0709455D0 (en) * 2007-05-17 2007-06-27 Johnson Electric Sa Electric motor
GB0720599D0 (en) 2007-10-22 2007-11-28 Johnson Electric Sa Electric motor
DE102009057453B4 (de) * 2009-12-09 2019-06-19 Schaeffler Technologies AG & Co. KG Gelenklager und dessen Verwendung
US11047389B2 (en) 2010-04-16 2021-06-29 Air Squared, Inc. Multi-stage scroll vacuum pumps and related scroll devices
DE102011090062A1 (de) * 2011-05-18 2012-11-22 Robert Bosch Gmbh Anlaufscheibe für eine elektrische Maschine
US20130232975A1 (en) 2011-08-09 2013-09-12 Robert W. Saffer Compact energy cycle construction utilizing some combination of a scroll type expander, pump, and compressor for operating according to a rankine, an organic rankine, heat pump, or combined organic rankine and heat pump cycle
US9540950B2 (en) * 2012-11-06 2017-01-10 GM Global Technology Operations LLC Oil deflector
EP2953243A1 (fr) 2014-06-06 2015-12-09 Siemens Aktiengesellschaft Dispositif pour la lubrification du palier à roulement d'un moteur électrique
US10508543B2 (en) 2015-05-07 2019-12-17 Air Squared, Inc. Scroll device having a pressure plate
US10865793B2 (en) 2016-12-06 2020-12-15 Air Squared, Inc. Scroll type device having liquid cooling through idler shafts
US10288081B1 (en) 2018-04-30 2019-05-14 PumpWorks, LLC Power end for a single-stage end suction centrifugal pump
CN112119219B (zh) 2018-05-04 2022-09-27 空气平方公司 固定和动涡旋压缩机、膨胀机或真空泵的液体冷却
JP7246867B2 (ja) * 2018-05-23 2023-03-28 株式会社ダイヤメット 焼結軸受
US11067080B2 (en) 2018-07-17 2021-07-20 Air Squared, Inc. Low cost scroll compressor or vacuum pump
US20200025199A1 (en) 2018-07-17 2020-01-23 Air Squared, Inc. Dual drive co-rotating spinning scroll compressor or expander
US11530703B2 (en) 2018-07-18 2022-12-20 Air Squared, Inc. Orbiting scroll device lubrication
JP2020051573A (ja) 2018-09-28 2020-04-02 マブチモーター株式会社 軸受ユニットおよびモータ
US11473572B2 (en) 2019-06-25 2022-10-18 Air Squared, Inc. Aftercooler for cooling compressed working fluid
US11898557B2 (en) 2020-11-30 2024-02-13 Air Squared, Inc. Liquid cooling of a scroll type compressor with liquid supply through the crankshaft
US11885328B2 (en) 2021-07-19 2024-01-30 Air Squared, Inc. Scroll device with an integrated cooling loop
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Also Published As

Publication number Publication date
WO1998013610A1 (fr) 1998-04-02
US6008557A (en) 1999-12-28
BR9706766A (pt) 1999-07-20

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