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WO2011045631A1 - Unité de capteur, élément de support, ensemble de palier de roulement et procédé pour assembler un tel ensemble de palier de roulement - Google Patents

Unité de capteur, élément de support, ensemble de palier de roulement et procédé pour assembler un tel ensemble de palier de roulement Download PDF

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Publication number
WO2011045631A1
WO2011045631A1 PCT/IB2009/055205 IB2009055205W WO2011045631A1 WO 2011045631 A1 WO2011045631 A1 WO 2011045631A1 IB 2009055205 W IB2009055205 W IB 2009055205W WO 2011045631 A1 WO2011045631 A1 WO 2011045631A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
rotation axis
rolling bearing
bearing assembly
support member
Prior art date
Application number
PCT/IB2009/055205
Other languages
English (en)
Inventor
Franck Landrieve
Olivier Cheve
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/IB2009/055205 priority Critical patent/WO2011045631A1/fr
Publication of WO2011045631A1 publication Critical patent/WO2011045631A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/443—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0005—Hubs with ball bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/02—Hubs adapted to be rotatably arranged on axle
    • B60B27/023—Hubs adapted to be rotatably arranged on axle specially adapted for bicycles
    • 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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
    • F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
    • F16J15/326—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals with means for detecting or measuring relative rotation of the two elements
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/20—Land vehicles

Definitions

  • the present invention relates to a sensor unit for a rolling bearing assembly.
  • the present invention relates to a rolling bearing assembly comprising such a sensor unit and/or such a support member. Furthermore, the present invention relates to a method for assembling such a rolling bearing assembly. The present invention also relates to a support member for a rolling bearing assembly.
  • the present invention can be used for example in a wheel of a two- wheels vehicle, such as a motorcycle or a bicycle.
  • a prior art rolling bearing assembly usually has a rolling bearing equipped with a fixed ring, a mobile ring rotatable around a rotation axis and a target attached to the mobile ring.
  • a prior art rolling bearing assembly also has a sensor unit, which comprises a sensor to read the target and which is mounted next to the rolling bearing along a direction parallel to the rotation axis.
  • a prior art method for assembling such a rolling bearing assembly requires two main steps: A first step consists in securing the rolling bearing to the rotating body, usually by fastening the inner ring to a shaft and by press-fitting, i.e. applying an axial force thereon, the outer ring into a casing, like the hub of a wheel. A second step consists in fastening the sensor unit to the shaft and/or to the casing while accurately placing the sensor unit next to the rolling bearing.
  • a prior art rolling bearing assembly also comprises a support member for supporting the target, the support member is secured to the mobile ring so as to accurately position the target which is to be read by the sensor.
  • the rolling bearing has one or more sealing member(s) extending between the mobile ring and the fixed ring and fastened to one of them.
  • a sealing member permits to seal the rolling bearing i.e. to prevent the ingress of exterior contaminants therein or the leakage of lubricant therefrom.
  • such an arrangement of two components, i.e. the support member next to the sealing member is relatively cumbersome and its assembly is relatively time-consuming and difficult.
  • One object of the present invention is to overcome the afore-mentioned drawbacks, by providing a sensor unit which allows to apply an axial force on the mobile ring, which provides a clearance between the mobile ring and the sensor unit and which enables a sealing of the rolling bearing.
  • a subject-matter of the present invention is a sensor unit, for a rolling bearing assembly having a rolling bearing equipped with a fixed ring, a mobile ring rotatable around a rotation axis and a target attached to the mobile ring, the sensor unit comprising:
  • At least one sensing element adapted to read the target
  • a hold ing part for hold ing the sensing element, the holding part being arranged to approximately face the mobile ring parallel to the rotation axis, a securing part intended to secure the sensor unit to the fixed ring, the securing part being arranged to approximately face the fixed ring parallel to the rotation axis.
  • the sensor unit further comprises a resilient part attached to the holding part and to the securing part, the elasticity of the resilient part allowing a displacement of the holding part relative to the securing part, said displacement having a component parallel to the rotation axis.
  • the resilient part allows to elastically move the holding part parallel to the rotation axis, so that the holding part can contact the mobile ring and apply a force thereon, thus permitting to press-fit the rolling bearing into a casing.
  • the resilient part is integral with the holding part and/or with the securing part.
  • the resilient part is distinct from the holding part and from the securing part.
  • the holding part, the securing part and the resilient part respectively are in the general shape of a ring , the resilient part surrounding at least partially the securing part, the holding part surrounding at least partially the resilient part.
  • the resilient part comprises an annular portion and a tubular portion, the annular portion having its periphery attached to the holding part and its central reg ion attach ed to the secu ri ng pa rt, the tubular portion extending from the central region of the annular portion parallel to the rotation axis and being attached to the securing part.
  • the resilient part is made of a synthetic material, either elastomeric or plastics.
  • Another object of the present invention is to provide a support member which has a compact structure and which allows a sealing of the rolling bearing.
  • a subject-matter of the present invention is a support member, for a rolling bearing equipped with a fixed ring, a mobile ring rotatable around a rotation axis and a target attached to the mobile ring, the support member comprising:
  • protruding ring for firmly receiving the target, the protruding ring being arranged to project outwards of the rolling bearing,
  • the support member further comprises a sealing element arranged to cooperate with the fixed ring so as to seal the rolling elements of the rolling bearing.
  • the sealing element is a lip seal.
  • the sealing element is in the general shape of an annulus.
  • the sealing element extends towards the rotation axis so as to cooperate with the inner ring of the rolling bearing.
  • the sealing element is secured to an annular surface of the support member, the annular surface being oriented opposite the protruding ring.
  • the protruding ring is in the general shape of a cylinder coaxial with the rotation axis, the outer surface of which is intended to receive the target.
  • the sealing element is made of a material containing nitrile.
  • the support member is made of an aluminium-based material.
  • a subject-matter of the present invention is a rolling bearing assembly having a rolling bearing equipped with a fixed ring, a mobile ring rotatable around a rotation axis and a target attached to the mobile ring, wherein:
  • the rolling bearing assembly further comprises a sensor unit according to the present invention
  • the holding part approximately faces the mobile ring parallel to the rotation axis
  • the securing part approximately faces the fixed ring parallel to the rotation axis
  • the securing part is fast in translation with the fixed ring parallel to the rotation axis
  • the resilient part has a rest position where a clearance extends, parallel to the rotation axis, between the holding part and a terminal surface of the mobile ring, and a contact position where the holding part contacts the terminal surface.
  • the support member according to the invention can achieve several functions: supporting the target and sealing the rolling bearing. According to advantageous but optional features, considered on their own or in any technically feasible combination:
  • the sensing element faces the target along a direction perpendicular to the rotation axis.
  • the elasticity of the resilient part is selected so that the force required for putting the resilient part in its contact position is lower than the static load capacity of the rolling bearing.
  • the fixed ring is the inner ring and the mobile ring is the outer ring, and wherein the sensor unit is formed according to the invention.
  • the holding part has an outer diameter larger than the outer diameter of the outer ring, wherein the outer ring defines a sealing surface, and wherein the holding part comprises a sealing member arranged to cooperate with the sealing surface so as to seal the clearance against exterior contaminants.
  • the sealing surface and the terminal surface are defined by a protruding element having a rotational symmetry around the rotation axis and a generally "L" cross-section, in a plane comprising the rotation axis, the sealing surface extending at a diameter larger than the outer diameter of the terminal surface, the sealing surface being longer, parallel to the rotation axis, than said clearance, so that the sealing member cooperates with the sealing surface when the resilient part is in its rest position and when the resilient part is in its contact position.
  • the target is a magnetic encoder washer.
  • the rolling bearing assembly further comprises a support member according to the present invention.
  • a subject-matter of the present invention is a method for assembling a rolling bearing assembly according to the present invention onto a rotating body having a shaft and a hub, like a wheel, wherein the method comprises the steps of:
  • FIG. 1 is a perspective view of a hub and a fork of a two-wheels vehicle, the hub comprising a rolling bearing assembly according to the invention, the latter comprising a sensor unit according to the invention and a support member according to the invention;
  • FIG. 2 is a partial cross-section, at a larger scale and along plane II on figure 1 , of the hub, the fork and the rolling bearing assembly of figure 1 .
  • FIG. 3 is an exploded perspective view of the rolling bearing assembly of figure 1 ;
  • FIG. 4 is an exploded perspective view, at an angle different from figure 3, of the rolling bearing assembly of figure 3;
  • FIG. 5 is a view, at a larger scale, of detail V on figure 2;
  • FIG. 6 is a view, at a larger scale, of detail VI on figure 5;
  • FIG. 7 is a perspective view, at a larger scale, of detail VII on figure 6, showing the support member of figure 3;
  • FIG. 8 is a perspective view of the support member of figure 3.
  • FIG. 9 is a view, at a larger scale, of detail IX on figure 5.
  • FIG. 1 depicts a rolling bearing assembly 1 according to the invention in its assembled and service state.
  • Rolling bearing assembly 1 is mounted into a hub 8 of a not-shown wheel which is held by a fork 9 and which has a shaft 7.
  • the assembled state of the rolling bearing assembly 1 as illustrated on figure 1 results from the completion of an assembling method according to the invention, which will be described later on.
  • Figures 2, 3, 4 and 5 depict the rolling bearing assembly 1 , which comprises a ball bearing 2 and a sensor unit 4.
  • Ball bearing 2 has an inner ring 21 and an outer ring 22.
  • Ball bearing 2 includes balls 23 arranged to roll between inner ring 21 and outer ring 22.
  • Outer ring 22 is fast in rotation with hub 8. Outer ring 22 thus forms a mobile ring of ball bearing 2. Outer ring 22 and hub 8 are intended to rotate around a rotation axis X 2 -X'2 of the ball bearing 2, whereas inner ring 21 and shaft 7 are intended to remain static. Inner ring 21 is secured to shaft 7. Inner ring 21 thus forms a fixed ring of ball bearing 2.
  • Rolling bearing assembly 1 further comprises a target 5 in the form of an encoder washer.
  • Target 5 has a generally rotational symmetry around axis X2- X' 2 . More accurately, target 5 is in the shape of a cylinder coaxial to axis X 2 -X'2- Target 5 is fastened to a support mem ber 3 accord ing to the invention as hereafter described in relation with figures 8 and 9.
  • Support member 3 belongs to the roll ing bearing assembly 1 , where it is fastened to outer ring 22. Hence, target 5 is fast in rotation with outer ring 22. Target 5 is thus rotatable around axis X 2 -X'2- Sensor un it 4 incl udes a sensing element or sensor 41 .
  • Sen sor 41 is arranged to detect or read target 5 along a rad ial direction, like direction Y2-Y 2 on figu re 2.
  • sensor 41 extends approximately at the same position than target 5 along an axial direction, parallel to axis X 2 -X'2- Sensor 41 extends only partially around axis X 2 -X'2- Sensor 41 hence "faces" a limited area of target 5.
  • sensor 41 is mounted so that sensor 41 and target 5 are separated by a gap 41 .5, which is less than the maximum sensing distance of sensor 41 .
  • axial refers to a direction parallel to the rotation axis X 2 -X'2 of bal l bearing 2.
  • rad ial refers to a direction perpendicular to the rotation axis X2-X'2, l ike radial direction Y2-Y'2 on figure 2.
  • a surface is said to be “axial” or “radial” by reference to a direction which is locally or globally perpendicular to that surface.
  • Target 5 can be made of a magnetic material and sensor 41 can perform the magnetic detection of target 5, for instance by detecting the intensity or the variation of the magnetic field generated by target 5.
  • FIGS 5 to 7 illustrate sensor unit 4 with more details.
  • Sensor unit 4 comprises a holding part 42 and a securing part 43.
  • Holding part 42 holds sensor 41 in a position where it can read target 5.
  • Securing part 43 is intended to secure sensor unit 4 to the fixed ring, i.e. to the inner ring 21 in the example of figures 1 to 7.
  • Holding part 42 is arranged to approximately face the mobile ring, i.e. outer ring 22 in the example of figures 1 to 7, parallel to axis X 2 -X'2- Securing part 43 is arranged to approximately face the fixed earing inner ring 21 parallel to axis X 2 - X' 2 .
  • the adverb "approximately" means that holding part 42 and outer ring 22 have correspond ing positions and extensions along a radial d irection l ike direction Y2-Y 2 on figure 5.
  • Securing part 43 is fast in translation along axis X 2 -X'2 with the fixed ring 21 . Indeed, an inner cyl indrical surface of securing part 43 is fitted on the outer cyl indrical surface of shaft 7. Securing part 43 also has a cyl indrical wing 432 fastened to inner ring 21 .
  • Sensor unit 4 further comprises a resilient part 44, which extends between holding part 42 and securing part 43 along a radial direction like direction Y2-Y'2- Resilient part 44 is attached to the holding part 42 and to the securing part 43.
  • Resil ient part 44 has an elasticity wh ich allows a displacement of the holding part 42 relative to the securing part 43.
  • this displacement only has a component parallel to axis X2-X'2, because resilient part 44 has a higher stiffness, preferably 10 times higher, in a radial direction like direction Y2-Y'2 than its relatively low stiffn ess along axis X 2 -X'2- I n oth er word s , th e rad i a l com pon ent of th is displacement is not significant with respect to its axial component.
  • resil ient part 44 stands in its rest position where a clearance 42.22 extends, parallel to axis X2-X 2, between the holding part 42 and a term inal surface 221 of outer ring 22.
  • Term inal surface 221 is defined by a p rotru d i n g el e m en t 220 wh i ch i s faste n ed to ou te r ring 22.
  • Protruding element 220 has a rotational symmetry around axis X 2 -X'2 and a generally "L" cross-section, in a plane comprising axis X2-X'2, like the plane of figure 6 or 7.
  • Protruding element rests against the axial outer surface of the outer ring 22, and is preferably fastened to it, l ike in the embod iment shown in the figures, for instance by means of laser welding or gluing.
  • Resil ient part 44 can also stand in a contact position where a contacting face 424 of holding part 42 contacts the terminal surface 221 . In such a contact position, an axial force can be transferred from the holding part 42 to the outer ring 22, as will be hereafter described.
  • the resilient part 44 is distinct or different from the holding part 42 and from the securing part 43.
  • securing part 43 can be made of metal
  • hold ing part 42 can be made of plastics
  • resilient part 44 can be made of any resil ient material, for instance a synthetic material like an elastomeric or a plastics material .
  • Holding part 42, securing part 43 and resilient part 44 respectively are in the general shape of a ring .
  • resil ient part 44 completely surrounds securing part 43 and holding part 42 completely surrounds resilient part 44.
  • resilient part 44 resiliently or elastically connects holding part 42 and securing part 43 on their whole periphery.
  • holding part 42 also comprises a cable 425, wh ich protrudes outwardly along rad ial direction Y2-Y 2 and towards a not-shown control unit. Cable 425 can transmit electric signals generated by sensor 41 , while reading target 5. Cable 425 and sensor 41 can be overmoulded with holding part 42. Besides, means for remotely transmitting signals like an antenna, can be used instead of cable 425 so as to reduce the overall d imensions of a roll ing bearing assembly accord ing to the invention.
  • Res i l ient pa rt 44 com prises a n a n n u l a r portion 441 and a tubular portion 442.
  • the periphery of the annular portion 441 is attached to the holding part 42 by means of a peripheral shoulder 443 fitted in a corresponding step 423 of holding part 42.
  • the central region of the annular portion 441 is attached to securing part 43 by means of a central rib 444 fitted into a peripheral groove 434 of securing part 43.
  • the tubular portion 442 extends from the central region of annular portion 441 parallel to axis X 2 -X'2-
  • the tubular portion 442 is attached to an outer cylindrical surface of securing part 43, for instance by means of shrinking or press-fitting.
  • the tubular portion 442 has a generally hollow frustoconical shape.
  • the tubular portion 442 can have a generally hollow cylindrical shape.
  • the elasticity of the resilient part 44 is determined so that the force required for putting the resilient part 44 in its contact position with protruding element 220 is lower than the static load capacity of rolling bearing 2. Since the static load capacity of rolling bearing 2 is a given parameter, such a condition can be met by designing resilient part 44 with appropriate dimensions and selecting its material with an appropriate Young's modulus.
  • holding part 42 comprises a cover 421 which faces ba l l beari ng 2 and wh ich has an outer d iameter D42.
  • This outer diameter D42 is larger than the outer diameter D22 of the outer ring 22.
  • holding part 42 covers and "hides" outer ring 22.
  • Cover 421 is equipped with a sealing member 422 in the form of a lip seal.
  • the sealing member 422 is fastened to cover 422 and is arranged to cooperate with a sealing surface 222 defined by protruding element 220.
  • the lip of sealing member 422 contacts the sealing surface 222 so as to seal the clearance 42.22 against exterior contaminants.
  • the sealing member 422 not only seals rolling bearing 2, but also the gap 41 .5 between target 5 and sensor 41 .
  • sealing surface 222 is defined by protruding element 220, in particular by an outer cyl indrical part thereof.
  • the terminal surface 221 has a diameter D221 smaller than the outer diameter D222 of the sealing surface 222. In other words, the terminal surface 221 extends closer to axis X 2 -X'2 than the sealing surface 222.
  • the length L222 of sealing surface 222 when measured parallel to axis X2-X'2, is larger than the axial length L42.22 of clearance 42.22.
  • the sealing member 422 cooperates with the sealing surface 222 not only when resilient part 44 is in its rest position, but also when resil ient part 44 is in its contact position, i.e. when contacting face 424 touches the terminal surface 221 .
  • the cooperation between sealing member 422 and sealing surface 222 hence, provide an efficient sealing in any service position of resilient part 44.
  • Inner ring 21 , outer ring 22 and balls 23 are pre-assembled to form ballbearing 2.
  • inner ring 21 i.e. the fixed ring, is secured to shaft 7.
  • securing part 43 is fastened in translation along X 2 -X'2 relative to inner ring 21 by means of cylindrical wings 432.
  • Protruding element 220 is secured on the axial, external face of outer ring 22, for instance by laser-welding or gluing.
  • outer ring 22 i.e. the mobile ring
  • bore 80 which purposely defines a receiving space for the outer ring 22.
  • rolling bearing assembly 1 is in its compact state, where sensor unit 4 stands next to the rolling bearing 2.
  • an operator applies an axial force on the holding part 42 towards outer ring 22 and up to putting the resilient part 44 in its contact position with protruding element 220.
  • the seal ing member can be separated from the sealing surface by a tight clearance.
  • the sealing member and the sealing surface are not in contact, unlike sealing member 422 and sealing surface 222.
  • This non-contacting sealing member can include a metallic material and/or be made of a labyrinth seal, so as to provide several ch icanes preventing ingress from exterior contaminants into the clearance 42.22.
  • the sealing surface can be an axial surface in the shape of an annulus coaxial with the rotation axis, instead of sealing surface 222, which is on the shape of a cylinder. This arrangement permits to reduce the overall radial dimensions of the rolling bearing assembly.
  • the sealing surface can be formed by a surface of the mobile ring, for instance of the outer ring.
  • the material constituting the sealing surface should be selected so that the surface roughness complies with the friction against the sealing member, in order to limit the wear thereof.
  • the mobile ring can be made of a standard steel for bearing such as 1 00Cr6, and the seal ing surface can be obtained by fine grinding or stamping . This embodiment avoids mounting a supplementary separate part on the outer ring, like protruding element 220.
  • the mobile ring can be the inner ring and the fixed ring the outer ring.
  • it is the inner ring that is press-fitted onto a shaft thanks to a resilient part of the sensor unit.
  • the sensor unit is fastened to the fixed, outer ring and the clearance extends between the sensor unit and the mobile, inner ring.
  • the securing part of sensor unit surrounds the resilient part which in turn surrounds the holding part.
  • bal ls 23 as rolling elements.
  • other rolling elements may be contemplated to implement the present invention, like rollers or needles.
  • the target can be discrete instead of symmetric around the rotation axis X 2 -X'2-
  • the rolling bearing assembly can comprise a sensing element performing an optical reading of a purposely designed target.
  • Other kinds of transducers may be contemplated to form the sensing element 41 , e.g. an optoelectronic transducer.
  • a rolling bearing assembly according to the invention permits to press-fit the roll ing bearing onto a rotating body without damaging the rolling bearing components.
  • a rolling bearing assembly according the present invention can have a longer service life, when the sensor unit acts as a cover for the rolling bearing. This covering function complies with the requirements of the press-fitting operations thanks to the elasticity of the resilient part.
  • the support member 3 comprises a protruding ring 31 for firmly receiving the target 5.
  • the protruding ring 31 is arranged to project outwards of the rolling bearing 2, i.e. towards sensor unit 4.
  • Support member 3 has a main body 30 in the form of an annulus extending radially in the region separating inner ring 21 and outer ring 22.
  • the support member 3 also comprises fastening means for fastening the support member 3 in rotation with the outer ring 22, i.e. with the mobile ring.
  • Main body 30 and protruding ring 31 can be made of an aluminium- based material, to form a light and strong support member 3.
  • the protruding ring 31 is in the general shape of a cylinder, coaxial with axis X 2 -X'2- Protruding cylinder 31 is integral with the main body 30.
  • the support member 3 is equipped with an intermediate ring 32 for receiving target 5.
  • the intermediate ring 32 is said to be “intermediate”, because it is placed between protruding ring 31 and target 5.
  • intermediate ring 32 is secured to the outer surface 33 of protruding ring 31 , for instance by gluing, press-fitting, overmoulding or shrinking, wh ile target 5 is secu red to the outer surface 34 of intermediate ring 32.
  • Intermediate ring 32 has a rotational symmetry around axis X 2 -X'2-
  • Intermediate ring 32 has an "S" cross-section in a plane comprising axis X2-X'2, like the plane of figure 9.
  • Intermediate ring 32 forms an armature for target 5.
  • Fastening means comprise an outer wing 35 integral with the main body
  • the outer wing 35 can be resiliently fastened into a radial groove 225, wh ich forms a step of outer ring 22.
  • the support member 3 is hence fast in rotation with outer ring 22.
  • support member 3 is equipped with a sealing element 36 in the general shape of an annulus.
  • the sealing element 36 is a lip seal.
  • the sealing element 36 has a securing portion 37 and a l ip 38.
  • Securing portion 37 is secured to an annular surface 39 of support member 3, for instance by shrinking , overmould ing or gluing.
  • the annular surface 39 is oriented opposite protruding ring 31 .
  • sealing element 36 contacts a radial outer surface of inner ring 21 .
  • lip 38 extends in the inner region, of a smaller diameter, of sealing element 36, whereas securing portion 37 extends in the outer region of larger diameter, of sealing element 36.
  • sealing element 36 includes an elastomeric material, in particular its lip 38, for instance a material containing nitrile such as NBR or HNBR, or PTFE or TPU material.
  • Sealing element 36 extends towards axis X 2 -X'2 up to the inner ring 21 , so as to cooperate with the inner ring 21 , i.e. with the fixed ring, so as to seal balls 23 of rolling bearing 2.
  • a support member 30 accord ing to the invention has a simple and compact structure, and permits a sealing of the rolling bearing, thus increasing its service life.
  • Such a support member achieves two functions within a sole part, i.e. supporting the target and sealing the rolling bearing.
  • the structure and arrangement of a sensor unit according to the invention and of a support member according to the invention provide an efficient sealing of the rolling bearing to a rolling bearing assembly according to the invention.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)

Abstract

L'invention porte sur une unité de capteur (4), qui comprend : un élément de détection (41) adapté pour lire une cible (5), une partie de support (42) pour supporter l'élément de détection (41), une partie de fixation (43) conçue pour fixer l'unité de capteur (4) à la bague fixe (21). L'unité de capteur (4) comprend de plus une partie élastique (44) fixée à la partie de support (42) et à la partie de fixation (43), l'élasticité de la partie élastique (44) permettant un déplacement de la partie de support (42) par rapport à la partie de fixation (43), ledit déplacement ayant une composante parallèle à l'axe de rotation (X2 - X'2).
PCT/IB2009/055205 2009-10-12 2009-10-12 Unité de capteur, élément de support, ensemble de palier de roulement et procédé pour assembler un tel ensemble de palier de roulement WO2011045631A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2009/055205 WO2011045631A1 (fr) 2009-10-12 2009-10-12 Unité de capteur, élément de support, ensemble de palier de roulement et procédé pour assembler un tel ensemble de palier de roulement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2009/055205 WO2011045631A1 (fr) 2009-10-12 2009-10-12 Unité de capteur, élément de support, ensemble de palier de roulement et procédé pour assembler un tel ensemble de palier de roulement

Publications (1)

Publication Number Publication Date
WO2011045631A1 true WO2011045631A1 (fr) 2011-04-21

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PCT/IB2009/055205 WO2011045631A1 (fr) 2009-10-12 2009-10-12 Unité de capteur, élément de support, ensemble de palier de roulement et procédé pour assembler un tel ensemble de palier de roulement

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WO (1) WO2011045631A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI486264B (zh) * 2011-08-29 2015-06-01 Shimano Kk 腳踏車後輪轂

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20206099U1 (de) * 2001-04-18 2002-07-18 Aktiebolaget SKF, Göteborg/Gotenburg Wälzlageranordnung mit Messwertaufnehmeranordnung
EP1452753A1 (fr) * 2003-02-26 2004-09-01 Aktiebolaget SKF Palier à roulement instrumenté
EP1619478A2 (fr) * 2004-06-22 2006-01-25 Aktiebolaget SKF (publ) Dispositif de détection de paramètre de rotation d'une roue, notamment d'une roue de véhicule

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20206099U1 (de) * 2001-04-18 2002-07-18 Aktiebolaget SKF, Göteborg/Gotenburg Wälzlageranordnung mit Messwertaufnehmeranordnung
EP1452753A1 (fr) * 2003-02-26 2004-09-01 Aktiebolaget SKF Palier à roulement instrumenté
EP1619478A2 (fr) * 2004-06-22 2006-01-25 Aktiebolaget SKF (publ) Dispositif de détection de paramètre de rotation d'une roue, notamment d'une roue de véhicule

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI486264B (zh) * 2011-08-29 2015-06-01 Shimano Kk 腳踏車後輪轂

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