WO2015043629A1 - Palier de roulement à élément de précontrainte - Google Patents

Palier de roulement à élément de précontrainte Download PDF

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Publication number
WO2015043629A1
WO2015043629A1 PCT/EP2013/069965 EP2013069965W WO2015043629A1 WO 2015043629 A1 WO2015043629 A1 WO 2015043629A1 EP 2013069965 W EP2013069965 W EP 2013069965W WO 2015043629 A1 WO2015043629 A1 WO 2015043629A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
bearing according
seal
elastic member
axially
Prior art date
Application number
PCT/EP2013/069965
Other languages
English (en)
Inventor
Laurent Varnoux
Original Assignee
Aktiebolaget Skf
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 Aktiebolaget Skf filed Critical Aktiebolaget Skf
Priority to PCT/EP2013/069965 priority Critical patent/WO2015043629A1/fr
Publication of WO2015043629A1 publication Critical patent/WO2015043629A1/fr

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
    • F16C25/00—Bearings for exclusively rotary movement adjustable for wear or play
    • F16C25/06—Ball or roller bearings
    • F16C25/08—Ball or roller bearings self-adjusting
    • F16C25/083—Ball or roller bearings self-adjusting with resilient means acting axially on a race ring to preload 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
    • F16C33/76—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
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • 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
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7843—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc
    • F16C33/7846—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a single annular sealing disc with a gap between the annular disc and the inner race
    • 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
    • F16C43/00—Assembling bearings
    • F16C43/04—Assembling rolling-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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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 present invention relates to rolling bearings, in particular rolling bearings having an inner ring and an outer ring with one or more rows of rolling elements, for example balls .
  • An electric motor generally comprises a casing inside which is mounted a stator and a rotor, and two rolling bearings located at each end of the rotor' s shaft.
  • ISO deep groove ball bearings are usually used. These bearings comprise inner and outer rings of the massive or solid type.
  • a "so lid ring” is to be understood as a ring obtained by machining with removal o f material (by turning, grinding) from steel tube stock, bar stock, rough forgings and/or rolled blanks .
  • Document EP-B l - 1 037 05 1 disclo ses an instrumented rolling bearing mounted into the casing o f the electric motor and stacked conical washers axially interposed between said rolling bearing and the casing.
  • Such a device uses a p lurality of pre-stressing washers that are independent of the rolling bearing. Accordingly, the motor manufacturer has to manage, handle and assemble a large number o f components.
  • One aim o f the present invention is to overcome these drawbacks.
  • the rolling bearing comprises an inner ring, an outer ring, at least one row of rolling elements disposed radially between the rings, and at least one seal fixed to one o f the rings and arranged radially between said rings .
  • the rolling bearing further comprises at least an axially elastic member fixed to said seal and mounted in axial contact with a lateral surface o f said ring axially delimiting said ring.
  • the axial retention o f the elastic member on the seal of the rolling bearing makes it possible to reduce the number of components to be procured and to be fitted. Manufacturing errors resulting from forgetting the elastic member are thus avoided, for example for a motor manufacturer when the rolling bearing is intended to an electric motor.
  • the elastic member is provided with a bearing surface axially spaced apart from the lateral surface of said ring and adapted to be in contact with an element outside said rolling bearing, and with an opposite abutment surface in axial contact with said lateral surface and axially located outside from a radial space existing between the inner and outer rings.
  • Said seal may comprise a fixing portion secured to said ring and a sealing portion cooperating with the other ring .
  • the elastic member is secured to the fixing portion o f said seal.
  • the elastic member may comprise at least one axial retaining hook for fixing said member to said seal.
  • the elastic member may comprise a plurality o f axial retaining hooks regularly spaced apart in the circumferential direction.
  • the elastic member is made in one part.
  • the elastic member may be a washer.
  • the elastic member comprises radial portions mounted in axial contact with the lateral surface of said ring and elastic portions connected to said radial portions and axially spaced apart from said lateral surface.
  • the elastic portions are located axially on the side opposite to the retaining hook(s) with respect to the radial portions.
  • the elastic portions may be regularly spaced apart in the circumferential direction.
  • the elastic portions may comprise corrugations.
  • the elastic portions may comprise tongues .
  • the elastic member may be a conical washer.
  • said seal is fixed into a groove formed on said ring.
  • a rolling bearing 10 with an axis 12 , comprises an outer ring 14, an inner ring 16, a plurality o f ro lling elements 1 8 , which in this case are balls, interposed between the rings, and a cage 20 for maintaining said rolling elements circumferentially spaced apart.
  • the ro lling bearing 10 further comprises on each side an annular seal 22, 24 to close the radial space that exists between the rings 14 and 1 6, and an axially elastic washer 26 mounted on the seal 22. As will be described later, the elastic washer 26 is adapted to exert an axial prelo ad.
  • the outer and inner rings 14, 16 are concentric and o f the solid type . One o f the rings rotates while the other is fixed or also rotates .
  • the outer ring 14 comprises a toroidal circular raceway 14a for the rolling elements 1 8 which is formed onto its bore and directed radially inwards, and two annular recesses or grooves 14b, 14c formed radially towards the outside from the bore and arranged laterally to the raceway 14a.
  • the grooves 14b, 14c are symmetrical relative to a radial plane passing through the centre of the rolling bearing 10.
  • the outer ring 14 also comprises opposite radial lateral surfaces 14d, 14e which axially delimit the bore and the outer surface of said ring.
  • the inner ring 16 comprises a toroidal circular raceway 16a for the rolling elements 1 8 which is formed onto its outer surface and directed radially outwards, and two opposite radial lateral surfaces 16b , 1 6c which axially delimit the bore and the outer surface of said ring.
  • the lateral surfaces 16b, 16c are respectively coplanar with the lateral frontal surfaces 14d, 14e of the outer ring.
  • Each seal 22, 24 is arranged radially between the outer and inner rings 14 and 1 6, fixed to said outer ring and arranged laterally to the rolling elements 1 8. Each seal 22, 24 is entirely housed into the radial space delimiting between the outer and inner rings 14, 1 6. Each seal 22, 24 is axially offset towards the inside with regard to associated lateral surface 14d, 14e of the outer ring.
  • each seal 22, 24 is made in one part and has a form o f a shield which is advantageously made o f metal, for example by cutting and stamping a metal sheet.
  • the seals 22, 24 are identical to one another and symmetrical relative to the transverse radial plane passing through the centre of the rolling bearing 10. Since the seals 22, 24 are identical in this example, only one o f them will be described here.
  • the seal 22 comprises an annular fixing portion 22a mounted into the groove 14b o f the outer ring in order to fix the seal to the said ring, an annular radial portion 22b extending radially inwards said fixing portion, and an annular axial portion 22c extending axially inwards the small-diameter edge of the radial portion 22b.
  • the axial portion 22c extends axially in the direction of the ro lling elements 1 8 and forms an annular narrow passageway with the outer surface of the inner ring 1 6.
  • the fixing portion 22a and the axial portion 22c form two radially opposed peripheral sealing portions applying respectively a static sealing with the outer ring 14 and a dynamic sealing with the inner ring 16.
  • Static sealing means the sealing made between two parts that do not move relative to one another.
  • Dynamic sealing means the sealing made between two parts that move relative to one another.
  • the fixing portion 22a of the seal is press-fitted in the groove 14b o f the outer ring in order to attach the seal 22 to said ring.
  • the elastic washer 26 is made in one part and may be advantageously manufactured in an economic way by cutting, stamping and fo lding a metal sheet.
  • the washer 26 may be made from synthetic material like po lyamide.
  • the elastic washer 26 is a corrugated washer.
  • the washer 26 bears axially against the lateral surface 14d of the outer ring.
  • the washer 26 has an outer diameter equal or smaller to the outer diameter of the outer ring 14.
  • the washer 26 comprises a plurality o f radial portions 26a coming into axial contact with the lateral surface 14d of the outer ring and a plurality of corrugated portions 26b connected to said radial portions .
  • Each corrugated portion 26b is connected to two successive radial portions 26a.
  • the corrugated portions 26b are regularly spaced apart in the circumferential direction.
  • the washer 26 comprises here four corrugated portions 26b .
  • the corrugated portions 26b extend axially outwards, i. e.
  • the corrugated portions 26b are axially spaced apart from the lateral surface 14d o f the outer ring 14 and more generally from said ring.
  • the radial portions 26a and the corrugated portions 26b of the washer are located outside from the radial space that exists between the outer and inner rings 14, 16.
  • Each radial portion 26a delimits a radial abutment surface 28 of the washer against the lateral surface 14d of the outer ring and each corrugated portion 26b delimits a bearing surface 30 lo cated axially on the opposite side to said abutment surface 28 and axially spaced apart from said lateral surface 14d.
  • the washer 26 further comprises a plurality o f lugs 26 c proj ecting axially from the bore of the radial portions 26a.
  • Each lug 26c extends axially inwards the associated radial portion 26a in the direction of the seal 22.
  • Each lug 26c comprises at its free end a retaining hook 26d extending radially outwards to secure the washer 26 to the fixing portion 22a of the seal.
  • the hooks 26d are regularly spaced apart in the circumferential direction.
  • the lugs 26c and the hooks 26d are located axially on the side opposite to the corrugated portions 26b with regard to the radial portions 26a.
  • the hooks 26d are identical to one another and have a complementary shape with the fixing portion 22a o f the seal in order to secure the elastic washer 26 on the seal 22.
  • the hooks 26d are adapted to engage with the fixing portion 22a o f the seal.
  • the elastic washer 26 is secured on the outer ring 14 by virtue of the seal 22.
  • the hooks 26d form retaining or anchorage means cooperating directly with the seal 22 to fix or attach the washer 26 to said seal.
  • the mounting of the washer 26 on the seal 22 can be easily achieved for example with a simple axial pushing movement without angular indexation.
  • the use of the elastic washer 26 allows the rolling bearing 10 to be axially preloaded while accommodating different expansions o f the rotor' s shaft, generally made of steel, and of casing, generally based on aluminium, said rolling bearing being able to slide axially with respect to the casing.
  • the ro lling bearing is compact and may be transported and handled with complete safety without any risk o f loss of the elastic washer. Besides, the motor manufacturer has one less component to procure, manage and fit.
  • the roller bearing may be fitted in the electric motor, particularly easily without requiring any special precaution.
  • a corrugated washer is used for axially pre-stressing or preloading the rolling bearing.
  • another type of elastic member such as conical washer of the Belleville type or a washer provided with a plurality o f elastic tongues, having retaining means cooperating with the seal fixed on the associated ring.
  • the invention has been illustrated on the basis of a rolling bearing comprising a washer mounted on a seal which is made in one part, mounted on the outer ring and applying a dynamic sealing without contact with the inner ring.
  • the seal may be provided with a rigid insert and with an elastic sealing member which partially covers the insert and having at least a friction sealing lip bearing against the inner ring and/or at least a labyrinth sealing lip , the elastic washer being secured to said rigid insert or sealing member.
  • the elastic washer is fixed on a seal mounted on the outer ring.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

L'invention porte sur un palier de roulement qui comporte une bague interne (16), une bague externe (14), au moins une rangée d'éléments de roulement (18) disposés radialement entre les bagues, et au moins un joint d'étanchéité (22) fixé à l'une des bagues (14) et agencé radialement entre lesdites bagues. Le palier de roulement comprend de plus au moins un élément élastique de façon axiale (26) fixé audit joint d'étanchéité et monté en contact axial avec une surface latérale (14d) de ladite bague délimitant de façon axiale ladite bague.
PCT/EP2013/069965 2013-09-25 2013-09-25 Palier de roulement à élément de précontrainte WO2015043629A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/069965 WO2015043629A1 (fr) 2013-09-25 2013-09-25 Palier de roulement à élément de précontrainte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2013/069965 WO2015043629A1 (fr) 2013-09-25 2013-09-25 Palier de roulement à élément de précontrainte

Publications (1)

Publication Number Publication Date
WO2015043629A1 true WO2015043629A1 (fr) 2015-04-02

Family

ID=49274625

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2013/069965 WO2015043629A1 (fr) 2013-09-25 2013-09-25 Palier de roulement à élément de précontrainte

Country Status (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170130775A1 (en) * 2015-04-24 2017-05-11 Aktiebolaget Skf Rolling bearing arrangement
DE102020104778A1 (de) 2020-02-24 2021-08-26 Minebea Mitsumi Inc. Linearstellantrieb und Ventileinrichtung zur Steuerung eines Fluidstroms
CN113939662A (zh) * 2019-06-25 2022-01-14 法雷奥电机设备公司 配备有滚动轴承预加载构件的旋转电机

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044380A (en) * 1930-05-20 1936-06-16 Gen Motors Corp Bearing and seal therefor
US3770992A (en) * 1971-02-28 1973-11-06 Rin Skf Officine Di Villar Per Bearing having closure means for closing the bearing seating
EP1037051A1 (fr) * 1999-03-17 2000-09-20 Skf France Palier à roulement instrumenté
JP2008232284A (ja) * 2007-03-20 2008-10-02 Jtekt Corp 転がり軸受の密封装置
JP2011021706A (ja) * 2009-07-16 2011-02-03 Toyota Motor Corp 皿バネ逆取付判定構造及び皿バネ逆取付判定方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2044380A (en) * 1930-05-20 1936-06-16 Gen Motors Corp Bearing and seal therefor
US3770992A (en) * 1971-02-28 1973-11-06 Rin Skf Officine Di Villar Per Bearing having closure means for closing the bearing seating
EP1037051A1 (fr) * 1999-03-17 2000-09-20 Skf France Palier à roulement instrumenté
JP2008232284A (ja) * 2007-03-20 2008-10-02 Jtekt Corp 転がり軸受の密封装置
JP2011021706A (ja) * 2009-07-16 2011-02-03 Toyota Motor Corp 皿バネ逆取付判定構造及び皿バネ逆取付判定方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170130775A1 (en) * 2015-04-24 2017-05-11 Aktiebolaget Skf Rolling bearing arrangement
US9835203B2 (en) * 2015-04-24 2017-12-05 Aktiebolaget Skf Rolling bearing arrangement
CN113939662A (zh) * 2019-06-25 2022-01-14 法雷奥电机设备公司 配备有滚动轴承预加载构件的旋转电机
DE102020104778A1 (de) 2020-02-24 2021-08-26 Minebea Mitsumi Inc. Linearstellantrieb und Ventileinrichtung zur Steuerung eines Fluidstroms

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