WO2012085617A1 - Bearing assembly with an encoder washer and a sensor unit - Google Patents

Bearing assembly with an encoder washer and a sensor unit Download PDF

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Publication number
WO2012085617A1
WO2012085617A1 PCT/IB2010/003529 IB2010003529W WO2012085617A1 WO 2012085617 A1 WO2012085617 A1 WO 2012085617A1 IB 2010003529 W IB2010003529 W IB 2010003529W WO 2012085617 A1 WO2012085617 A1 WO 2012085617A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing assembly
encoder washer
armature
assembly according
sensor unit
Prior art date
Application number
PCT/IB2010/003529
Other languages
French (fr)
Inventor
Olivier Cheve
Alexis Gatesoupe
Mathieu Hubert
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/IB2010/003529 priority Critical patent/WO2012085617A1/en
Publication of WO2012085617A1 publication Critical patent/WO2012085617A1/en

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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
    • 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
    • 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
    • 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

  • US-A-2004/0200620 discloses a rolling bearing assembly with an instrumented ball bearing provided with a sensor and an encoder washer fast in rotation with an outer rotatable wheel of a ball bearing.
  • a body supports the sensor and radially surrounds the encoder washer in order to protect it, as much as possible, from contamination with water and/or dust. This is globally satisfactory, but the sensor body is bulky and, in some circumstances, water and/or dust can still reach the air gap between the encoder washer and the sensor, which might perturb a measure obtained with this device.
  • the sealing gasket is mounted in an inner peripheral groove of the body of the sensor unit.
  • the rolling bearing assembly includes an axial spacer in abutment against the inner fixed ring of the rolling bearing and fast with the sensor unit. This axial spacer sets the axial position of the sealing gasket with respect to the outer peripheral surface of the armature.
  • the encoder washer is in overhang, along the rotation axis, with respect to the rotatable outer ring of the rolling bearing and the outer peripheral surface of the armature and the magnetic body are axially offset with respect to the rotatable outer ring.
  • the body of the sensor unit is made a synthetic material, of aluminum or of an aluminum based alloy.
  • the inner jacket is made stainless steel, in particular x20Cr13 (grade 420) steel.
  • the annular jacket has a surface hardness larger than 35HRC.
  • FIG. 1 is a partial sectional view of an front wheel and fork assembly of a motorcycle embodying the invention
  • figure 3 is an axial section of two parts of a rolling bearing assembly used in the device of figures 1 and 2, during manufacturing.
  • Figures 1 to 3 depict a rolling bearing assembly 1 comprising a ball bearing 2 having an inner ring 22, an outer ring 24 and several balls 26 held in position by a cage 28 within a chamber 29 defined between rings 22 and 24.
  • Two sealing gaskets 23 and 25 extend between rings 22 and 24, on either sides of plane P 2 including the respective centers of balls 26, in order to isolate chamber 29 from the outside.
  • Inner ring 22 is mounted on shaft 101 which is supported by a fork 102 of a nonrepresented motorcycle. A nut 103 immobilizes shaft 101 with respect to fork 102. Inner ring 22 is fast in rotation with shaft 101 . Inner ring 22 can be tight fitted on shaft 101 or a non represented key can be used to immobilize inner ring 22 in rotation around shaft 101.
  • X1 denotes a central longitudinal axis of shaft 101 and X2 denotes a central axis of ball bearing 2. Axes X1 and X2 are superimposed when ball bearing 2 is mounted onto shaft 101. Thanks to balls 26, outer ring 24 can rotate around axis X2 when inner ring 22 is fixed with respect to the support structure formed of items 101 , 102 and 103.
  • Outer ring 24 is fast with a hub 104 of a non-represented wheel.
  • Hub 104 has a central opening 106 with a recess 108 adapted to accommodate outer ring 24.
  • Outer ring 24 is tight fitted or otherwise fast in rotation with hub 104.
  • An encoder washer 4 is fast in rotation with outer ring 24 and comprises a metallic armature 42 and a magnetic body 44 which defines several magnetic North and South poles. Encoder washer 4 is centered on an axis X4 which is superimposed with axis X2 when encoder washer 4 is mounted onto outer ring 24 by snapping of a radial outer skirt 422 of armature 42 within an outer peripheral groove 242 of outer ring 24.
  • Magnetic body 44 is made in a magnetic material such as ferrite, e.g. plastoferrite or elastoferrite, or a rare earth such as NdFeB or Sn2Co17. This magnetic body is polarized in order to constitute the North and South magnetic poles.
  • Skirt 422 is connected by an annular portion 424 of armature 42, which is planar and perpendicular to axis X4, to a cylindrical sleeve 426 having a circular co-section.
  • the inner radial face 427 of sleeve 426 surrounds magnetic body 44.
  • a part 426 of armature 42 radially covers magnetic body 44, which participates to its protection against shocks.
  • parts 426 and 44 are in overhang with respect to outer ring 24 of ball bearing 2, along axis X2.
  • a sealing gasket 5 is mounted in an annular recess 109 of hub 104 and has two lips 52 and 54.
  • Sealing gasket 54 is advantageously made of an elastomeric material such as NBR (Nitrile Butadiene Rubber, a well known material in the field of sealing devices).
  • a sensor unit 6 also belongs to rolling bearing assembly 1 and includes a sensing element 62 such as a Hall effect cell, which is mounted on a printed circuit board or PCB 64. Sensing element 62 and PCB 64 are overmolded in a sensor body 66 made of a synthetic material such as polyamide, e.g. PA66. Alternatively, body 66 can be made of aluminum.
  • a cable 3 represented by its axis connects PCB 64 to a non-represented electronic control unit adapted to treat the output signal of sensing element 62.
  • Cable 3 is immobilized in an overmolded quantity 67 of synthetic material which fills a housing of sensor body 66 where PCB 64 is received and which surrounds the end of cable 3 next to body 66.
  • a metallic spacer 7 is installed within through hole 664 and participates to the axial positioning of ball bearing 2 along shaft 101 , that is along axes X1 and X2.
  • spacer 7 is adapted to transmit axial forces between inner ring 22 and fork 102 when nut 103 is tied.
  • an end face 72 of spacer 7 is adapted to be in abutment against a lateral face 222 of inner ring 22.
  • Spacer 7 is fast along axis X6 with body 66.
  • Groove 666 is provided on the inner side of a part 667 of body 66 so that groove 666 can be considered as an inner peripheral groove of body 66.
  • annular jacket 9 is mounted around part 667 of body 66 and radially surrounds this part.
  • Annular jacket is made of stainless steel, for example x20Cr13 (grade 420) steel, that is a material with a higher hardness than the material of sensor body 66.
  • the material of annular jacket 9 is chosen so that it has a surface hardness larger than 35 HRC according to EN-ISO-6508-1 norm.
  • Sensing element 62 is located in a portion 668 of body 66 which protrudes axially, along a central axis X6 of through hole 664, with respect to portion 667 and gasket 8.
  • sensing element 62 is axially aligned, along axis X2, with respect to magnetic body 44 and magnetic body 44 surrounds sensing element 62.
  • sensing element 62 is located radially inside of part of encoder washer 4 formed by sleeve 426 and magnetic body 44.
  • G denotes an air gap between sensing element 62 and a radial inner surface 444 of magnetic body 44.
  • a variable magnetic field exists in air gap G, when outer ring 24 and encoder washer 4 rotate with respect to inner ring 22 and sensing element 62.
  • Sensing element 62 is oriented to read the variable magnetic field, that is to read encoder washer 4, in a direction D which is radial with respect to axis X2 and centrifugal, that is which goes away from axis X2.
  • This construction provides a good axial and radial compactness to rolling bearing assembly 1.
  • lip 842 is in sliding contact with surface 428, which prevents contamination of air gap G with dust, water and/or any other contaminant.
  • sealing gasket is a standard gasket manufactured in large quantities. This keeps the cost of rolling bearing assembly 1 low and its reliability high.
  • sensor body 66 can be made of aluminum.
  • sensor unit can include more than one sensing element.
  • bearing 2 can be a plain bearing instead of a rolling bearing.

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

Abstract

This bearing assembly (1 ) comprises a bearing (2) with an inner fixed (22) ring and an outer ring (24) rotatable around a rotation axis (X2), an encoder washer (4) fast in rotation with the outer ring (24) and made of an armature (42) and a magnetic body (44), a sensor unit (6) including at least one sensing element (62) arranged to read said encoder washer. The sensing element (62) is located radially inside the encoder washer (4) and oriented to read the encoder washer in a radial and centrifugal direction with respect to the rotation axis (X2). The armature (42) of the encoder washer (4) radially surrounds the magnetic body (44). A sealing gasket (8) mounted on the sensing unit (6) is in sliding contact with an outer peripheral surface (428) of the armature (42).

Description

BEARING ASSEMBLY WITH AN ENCODER WASHER AND A SENSOR UNIT
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bearing assembly comprising, amongst others, an encoder washer and a sensor unit. This invention can be used, for example, with a wheel of a two-wheels vehicle such as a motorcycle or bicycle.
BACKGROUND OF THE INVENTION
US-A-2004/0200620 discloses a rolling bearing assembly with an instrumented ball bearing provided with a sensor and an encoder washer fast in rotation with an outer rotatable wheel of a ball bearing. A body supports the sensor and radially surrounds the encoder washer in order to protect it, as much as possible, from contamination with water and/or dust. This is globally satisfactory, but the sensor body is bulky and, in some circumstances, water and/or dust can still reach the air gap between the encoder washer and the sensor, which might perturb a measure obtained with this device.
SUMMARY OF THE INVENTION
One object of the present invention is to overcome the aforementioned drawbacks, by providing a rolling bearing assembly including an efficient protection against contamination of an air gap between a magnetic body of an encoder washer and a sensing element of a sensor unit.
To this end, this invention concerns a bearing assembly comprising a rolling bearing with an inner fixed ring and outer ring rotatable around a rotation axis, an encoder washer, fast in rotation with said outer ring and made of an armature and a magnetic body, and a sensor unit, including at least one sensing element arranged to read the encoder washer. According to the invention, the sensing element is located radially inside the encoder washer and oriented to read the encoder washer in a radial and centrifugal direction with respect to the rotation axis, the armature of the encoder washer radially surrounds the magnetic body and a sealing gasket mounted on the sensing unit is in sliding contact with an outer peripheral surface of the armature.
Thanks to the invention, the location and orientation of the sensing element allows the encoder washer armature to participate to a sealing function obtained with the sealing gasket which is mounted onto the sensing unit. The geometry of the sensing unit can be chosen so that a standard sealing gasket can be used, with a high reliability and a low cost. Generally speaking, a rolling bearing comprises an inner ring, an outer ring and several rolling bodies installed between these two rings. These rolling bodies can be balls, rollers on needles. Thus, a rolling bearing can be, for instance, a ball bearing, a roller bearing or a needle bearing. In a plain bearing, the inner and outer rings are in direct sliding contact. A bearing assembly can include a rolling bearing or a plain bearing.
In the present description, and except otherwise specified, the word "axial", "radial", "axially", and "radially" relate to the axis rotation of the encoder washer. A direction is "axial", when it is parallel to such an axis and a direction or an axis is "radial", when it is perpendicular to and secant with such an axis.
According to further aspects of the invention which are advantageous but not compulsory, the rolling assembly might incorporate one or several of the following features, taken in any technical admissible configurations:
- The sealing gasket is mounted in an inner peripheral groove of the body of the sensor unit.
- The body of the sensor unit is made of a synthetic material, in particular a molded plastic material.
- The rolling bearing assembly includes an axial spacer in abutment against the inner fixed ring of the rolling bearing and fast with the sensor unit. This axial spacer sets the axial position of the sealing gasket with respect to the outer peripheral surface of the armature.
- The encoder washer is in overhang, along the rotation axis, with respect to the rotatable outer ring of the rolling bearing and the outer peripheral surface of the armature and the magnetic body are axially offset with respect to the rotatable outer ring.
- The sensor unit has a body made of a first material and an annular jacket made of a second material with a hardness higher that the hardness of the first material, whereas a second sealing gasket mounted on a member fast in rotation with the outer rotatable ring is in sliding contact with an outer peripheral surface of the annular gasket.
- The body of the sensor unit is made a synthetic material, of aluminum or of an aluminum based alloy.
- The inner jacket is made stainless steel, in particular x20Cr13 (grade 420) steel.
- The annular jacket has a surface hardness larger than 35HRC.
- The armature of the encoder washer is metallic. BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be well understood on the basis of the following description which is given in correspondence with the annexed figures and as an illustrative example, without restricting the object of the invention. In the annexed figures:
- figure 1 is a partial sectional view of an front wheel and fork assembly of a motorcycle embodying the invention,
figure 2 is an enlarged view of detail II on figure 1 , and
figure 3 is an axial section of two parts of a rolling bearing assembly used in the device of figures 1 and 2, during manufacturing.
DETAILED DESCRIPTION OF SOME EMBODIMENTS
Figures 1 to 3 depict a rolling bearing assembly 1 comprising a ball bearing 2 having an inner ring 22, an outer ring 24 and several balls 26 held in position by a cage 28 within a chamber 29 defined between rings 22 and 24. Two sealing gaskets 23 and 25 extend between rings 22 and 24, on either sides of plane P2 including the respective centers of balls 26, in order to isolate chamber 29 from the outside.
Inner ring 22 is mounted on shaft 101 which is supported by a fork 102 of a nonrepresented motorcycle. A nut 103 immobilizes shaft 101 with respect to fork 102. Inner ring 22 is fast in rotation with shaft 101 . Inner ring 22 can be tight fitted on shaft 101 or a non represented key can be used to immobilize inner ring 22 in rotation around shaft 101. X1 denotes a central longitudinal axis of shaft 101 and X2 denotes a central axis of ball bearing 2. Axes X1 and X2 are superimposed when ball bearing 2 is mounted onto shaft 101. Thanks to balls 26, outer ring 24 can rotate around axis X2 when inner ring 22 is fixed with respect to the support structure formed of items 101 , 102 and 103.
Outer ring 24 is fast with a hub 104 of a non-represented wheel. Hub 104 has a central opening 106 with a recess 108 adapted to accommodate outer ring 24. Outer ring 24 is tight fitted or otherwise fast in rotation with hub 104.
Close to the non-represented end of shaft 101 , another ball bearing supports the other side of hub 104 which can thus rotate with respect to axes X1 and X2.
An encoder washer 4 is fast in rotation with outer ring 24 and comprises a metallic armature 42 and a magnetic body 44 which defines several magnetic North and South poles. Encoder washer 4 is centered on an axis X4 which is superimposed with axis X2 when encoder washer 4 is mounted onto outer ring 24 by snapping of a radial outer skirt 422 of armature 42 within an outer peripheral groove 242 of outer ring 24. Magnetic body 44 is made in a magnetic material such as ferrite, e.g. plastoferrite or elastoferrite, or a rare earth such as NdFeB or Sn2Co17. This magnetic body is polarized in order to constitute the North and South magnetic poles.
Skirt 422 is connected by an annular portion 424 of armature 42, which is planar and perpendicular to axis X4, to a cylindrical sleeve 426 having a circular co-section. The inner radial face 427 of sleeve 426 surrounds magnetic body 44. In other words, a part 426 of armature 42 radially covers magnetic body 44, which participates to its protection against shocks.
428 denotes the outer radial face of sleeve 426.
As apparent on figure 3, parts 426 and 44 are in overhang with respect to outer ring 24 of ball bearing 2, along axis X2.
A sealing gasket 5 is mounted in an annular recess 109 of hub 104 and has two lips 52 and 54. Sealing gasket 54 is advantageously made of an elastomeric material such as NBR (Nitrile Butadiene Rubber, a well known material in the field of sealing devices).
A sensor unit 6 also belongs to rolling bearing assembly 1 and includes a sensing element 62 such as a Hall effect cell, which is mounted on a printed circuit board or PCB 64. Sensing element 62 and PCB 64 are overmolded in a sensor body 66 made of a synthetic material such as polyamide, e.g. PA66. Alternatively, body 66 can be made of aluminum. A cable 3 represented by its axis connects PCB 64 to a non-represented electronic control unit adapted to treat the output signal of sensing element 62.
Cable 3 is immobilized in an overmolded quantity 67 of synthetic material which fills a housing of sensor body 66 where PCB 64 is received and which surrounds the end of cable 3 next to body 66.
664 denotes a central through hole of sensor body 66. A metallic spacer 7 is installed within through hole 664 and participates to the axial positioning of ball bearing 2 along shaft 101 , that is along axes X1 and X2. In particular, spacer 7 is adapted to transmit axial forces between inner ring 22 and fork 102 when nut 103 is tied. With this respect, an end face 72 of spacer 7 is adapted to be in abutment against a lateral face 222 of inner ring 22. Spacer 7 is fast along axis X6 with body 66.
A sealing gasket 8 is mounted in a groove 666 of sensor body 66 and comprises a metallic armature 82 and a flexible body 84 forming a double deformable lip 842 adapted to be in sliding contact with outer face 428 of armature 42 in the mounted configuration of rolling bearing assembly 1.
Groove 666 is provided on the inner side of a part 667 of body 66 so that groove 666 can be considered as an inner peripheral groove of body 66.
An annular jacket 9 is mounted around part 667 of body 66 and radially surrounds this part. Annular jacket is made of stainless steel, for example x20Cr13 (grade 420) steel, that is a material with a higher hardness than the material of sensor body 66. The material of annular jacket 9 is chosen so that it has a surface hardness larger than 35 HRC according to EN-ISO-6508-1 norm.
Sensing element 62 is located in a portion 668 of body 66 which protrudes axially, along a central axis X6 of through hole 664, with respect to portion 667 and gasket 8.
In the mounted configuration of rolling bearing assembly 1 represented on figures 1 and 2, sensing element 62 is axially aligned, along axis X2, with respect to magnetic body 44 and magnetic body 44 surrounds sensing element 62. In other words, sensing element 62 is located radially inside of part of encoder washer 4 formed by sleeve 426 and magnetic body 44.
G denotes an air gap between sensing element 62 and a radial inner surface 444 of magnetic body 44. A variable magnetic field exists in air gap G, when outer ring 24 and encoder washer 4 rotate with respect to inner ring 22 and sensing element 62. Sensing element 62 is oriented to read the variable magnetic field, that is to read encoder washer 4, in a direction D which is radial with respect to axis X2 and centrifugal, that is which goes away from axis X2. This construction provides a good axial and radial compactness to rolling bearing assembly 1.
In the mounted configuration of rolling bearing assembly 1 , lip 842 is in sliding contact with surface 428, which prevents contamination of air gap G with dust, water and/or any other contaminant.
The respective diameters of surface 428 and groove 666 can be chosen so that sealing gasket is a standard gasket manufactured in large quantities. This keeps the cost of rolling bearing assembly 1 low and its reliability high.
In the mounted configuration of rolling bearing assembly 1 , the lips 52 and 54 of sealing gasket 5 are in sliding contact with the outer peripheral surface 92 of annular jacket 9. This sealing gasket 5 isolates sealing gasket 8 from dust and water. In other words, a two stages sealing function is obtained with sealing gaskets 5 and 8, which efficiently prevents water, dust or any other contaminant from reaching air gap G.
Because of the material of annular jacket 9, the sliding contact of sealing gasket 5 does not scratch or otherwise damage sensor body 66.
Upon manufacturing of rolling bearing assembly 1 , once encoder washer 4 has been mounted on outer ring 24, axes X2, X4 and X6 are superimposed and sensor unit 6 is pushed towards rolling bearing 2, in the direction of arrows A1 in figure 3. This movement is made up to when spacer 7 comes into abutment against lateral face 222 of inner ring 22. In this position, sealing gasket is aligned with a plane P4 which is radial with respect to axis X4 and crosses a median zone of surface 428, between portion 424 and a free edge of sleeve 426.
According to a non-represented embodiment of the invention, sensor body 66 can be made of aluminum.
According to non-represented embodiments of the invention, sensor unit can include more than one sensing element. Moreover, bearing 2 can be a plain bearing instead of a rolling bearing.

Claims

1. A bearing assembly comprising:
- a bearing (2) with an inner fixed (22) ring and an outer ring (24) rotatable around a rotation axis (X2),
- an encoder washer (4) fast in rotation with said outer ring and made of an armature (42) and a magnetic body (44),
- a sensor unit (6) including at least one sensing element (62) arranged to read said encoder washer,
wherein
- said sensing element (62) is located radially inside said encoder washer (4) and oriented to read said encoder washer in a radial and centrifugal direction (D) with respect to said rotation axis (X2),
- said armature (42) of said encoder washer radially surrounds said magnetic body (44), and
- a sealing gasket (8) mounted on said sensing unit (6) is in sliding contact with an outer peripheral surface (428) of said armature.
2. Bearing assembly according to claim 1 , wherein said sealing gasket (8) is mounted in an inner peripheral groove (666) of a body (66) of said sensor unit (6).
3. Bearing assembly according to claim 2, wherein said body (66) is made of a synthetic material, in particular a molded plastic material.
4. Bearing assembly according to one of the preceding claims, wherein it includes an axial spacer (7) in abutment against said inner fixed ring (22) and fast with said sensor unit (6).
5. Bearing assembly according to one of the preceding claims, wherein said encoder washer (4) is in overhang, along said rotation axis (X2), with respect to said rotatable outer ring (24) and said outer peripheral surface (428) of said armature (44) and said magnetic body are axially offset with respect to said rotatable outer ring.
6. Bearing assembly according to one of the preceding claims, wherein said sensor unit (6) has a body (66) made of a first material and an annular jacket (9) made of a second material with a hardness higher than the hardness of said first material of and wherein a second sealing gasket (5) mounted on a member (104) fast in rotation with said outer rotatable ring (24) is in sliding contact with an outer peripheral surface (92) of said annular jacket.
7. Bearing assembly according to claim 6, wherein said body (66) is made of a synthetic material, of aluminum or of aluminum based alloy.
8. Bearing assembly according to one of claims 6 or 7, wherein said annular jacket (9) is made of stainless steel, in particular x20Cr13 (grade 420) steel.
9. Bearing assembly according to one of claims 6 to 8, wherein said annular jacket (9) has a surface hardness larger than 35HRC.
10. Bearing according to one of the previous claims, wherein said armature (42) is metallic.
PCT/IB2010/003529 2010-12-20 2010-12-20 Bearing assembly with an encoder washer and a sensor unit WO2012085617A1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220364604A1 (en) * 2021-05-17 2022-11-17 Aktiebolaget Skf Sensor bearing unit
US20220364602A1 (en) * 2021-05-17 2022-11-17 Aktiebolaget Skf Sensor bearing assembly
US20220364601A1 (en) * 2021-05-17 2022-11-17 Aktiebolaget Skf Sensor bearing assembly

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207470A (en) * 1987-07-24 1989-02-01 Riv Officine Di Villar Perosa A sealing assembly for interposition between two members in relative rotation operable to permit detection of the speed of relative rotation between them, and a bearing for supporting a vehicle wheel, provided therewith
EP1359423A1 (en) * 2002-05-03 2003-11-05 Aktiebolaget SKF Roller assembly having a roller bearing being equipped with an angular speed sensor
US20040200620A1 (en) 2002-12-27 2004-10-14 Inge Ostergaard Subsea system for processing fluid
FR2946107A1 (en) * 2009-06-02 2010-12-03 Skf Ab INSTRUMENT BEARING ASSEMBLY, DEVICE FOR DETECTING THE ROTATION OF A WHEEL COMPRISING SUCH AN ASSEMBLY AND METHOD FOR MANUFACTURING SUCH AN ASSEMBLY

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207470A (en) * 1987-07-24 1989-02-01 Riv Officine Di Villar Perosa A sealing assembly for interposition between two members in relative rotation operable to permit detection of the speed of relative rotation between them, and a bearing for supporting a vehicle wheel, provided therewith
EP1359423A1 (en) * 2002-05-03 2003-11-05 Aktiebolaget SKF Roller assembly having a roller bearing being equipped with an angular speed sensor
US20040200620A1 (en) 2002-12-27 2004-10-14 Inge Ostergaard Subsea system for processing fluid
FR2946107A1 (en) * 2009-06-02 2010-12-03 Skf Ab INSTRUMENT BEARING ASSEMBLY, DEVICE FOR DETECTING THE ROTATION OF A WHEEL COMPRISING SUCH AN ASSEMBLY AND METHOD FOR MANUFACTURING SUCH AN ASSEMBLY

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220364604A1 (en) * 2021-05-17 2022-11-17 Aktiebolaget Skf Sensor bearing unit
US20220364602A1 (en) * 2021-05-17 2022-11-17 Aktiebolaget Skf Sensor bearing assembly
US20220364601A1 (en) * 2021-05-17 2022-11-17 Aktiebolaget Skf Sensor bearing assembly
US11703089B2 (en) * 2021-05-17 2023-07-18 Aktiebolaget Skf Sensor bearing assembly
US11746829B2 (en) * 2021-05-17 2023-09-05 Aktiebolaget Skf Sensor bearing assembly
US11982317B2 (en) * 2021-05-17 2024-05-14 Aktiebolaget Skf Sensor bearing unit

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