WO2010116208A1 - Ring for a rolling bearing system and rolling bearing system comprising such a ring - Google Patents

Ring for a rolling bearing system and rolling bearing system comprising such a ring Download PDF

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Publication number
WO2010116208A1
WO2010116208A1 PCT/IB2009/052789 IB2009052789W WO2010116208A1 WO 2010116208 A1 WO2010116208 A1 WO 2010116208A1 IB 2009052789 W IB2009052789 W IB 2009052789W WO 2010116208 A1 WO2010116208 A1 WO 2010116208A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
base member
rolling bearing
sensing element
protruding part
Prior art date
Application number
PCT/IB2009/052789
Other languages
French (fr)
Inventor
Franck Landrieve
Olivier Cheve
Sylvain Chaussat
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/IB2009/052789 priority Critical patent/WO2010116208A1/en
Publication of WO2010116208A1 publication Critical patent/WO2010116208A1/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
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing
    • 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

Definitions

  • the present invention relates to a ring for a rolling bearing system. Besides, the present invention relates to a rolling bearing system comprising such a ring.
  • EP-A-O 495 323 discloses an integral ring comprising a sensor means which include a sensor and a circular body, as an integral unit.
  • the sensor means of EP-A-O 495 323 is secured to a receiving means arranged into a ball-bearing.
  • This structure of the ring of EP-A-O 495 323 implies a quite complicated and expensive production of such a sensor means, with the circular body integral with the sensor.
  • the arrangement of the circular body into a rolling bearing results in a relatively low serviceability.
  • such a sensor means requires a special rolling bearing with a counterbore for housing the circular body. The assembly of the ring and the rolling bearing is difficult, hence expensive.
  • One object of the present invention is to solve the here-above described problems, by providing a ring which is cost-effective, easy to produce and to incorporate into a rolling bearing system and which provides a high serviceability of the sensor.
  • a ring for a rolling bearing system comprising, said ring comprising:
  • At least one sensing element configured to read a target rotatable around an axis of rotation of said rolling bearing
  • Said ring further comprises attaching means for setting said sensing element fixed with respect to said base member.
  • said ring is a snap ring having a C-shape and configured to stand axial stresses from said system, said snap ring having two legs defining said base member,
  • said snap ring is of the internal type
  • said snap ring is of the external type
  • said base member has a radial dimension greater than its axial dimension
  • said attaching means comprise at least one protruding part projecting from said base member, said sensor being mounted on said protruding part, so that said sensing element is remote from said base member,
  • said sensing element is separated from said base member by a distance which extends axially with respect to said axis of rotation
  • said sensing element is separated from said base member by a distance which extends radially with respect to said axis of rotation
  • said protruding part extends in a radial direction with respect to said base member
  • said protruding part extends in an axial direction with respect to said base member
  • said base member is symmetric around said axis of rotation and said protruding part extends symmetrically with respect to a plane comprising said axis of rotation,
  • said sensing element is configured to read along an axial direction and/or along a radial direction.
  • said sensing element is selected in the group comprising a magnetic sensor, a capacitive sensor, an inductive sensor or an optical sensor.
  • a rolling bearing system comprising:
  • Said rolling bearing system further comprises at least one ring as here-above described and said case or said shaft has a radial groove configured to receive said ring.
  • FIG. 1 is a perspective view of a ring according to a first embodiment of the invention
  • figure 2 is an exploded perspective view of the ring of figure 1 ,
  • FIG. 3 is a truncated perspective view of a rolling bearing system according to a first embodiment of the invention and comprising the ring of figure 1 ,
  • figure 4 is a view analogous to figure 1 for a ring according to a second embodiment of the invention.
  • figure 5 is a view analogous to figure 2 of the ring of figure 4, and
  • figure 6 is a view analogous to figure 3 of a system according a second embodiment of the invention and comprising the ring of figure 4.
  • Figure 1 depicts a ring 100 comprising a base member 101 and a sensor 120.
  • Figure 2 shows base member 101 and sensor 120 before their assembly to form ring 100.
  • Ring 100 herein forms a snap ring of the internal type.
  • the dimensions and material of ring 100 and of base member 101 are purposely selected to provide elasticity.
  • the base member 101 can be made of plastic or of metal.
  • the base member 101 is of a generally circular shape.
  • the base member 101 has two curved legs 102 and 103 which define a C-shape and an opening 104 between their cantilevered ends.
  • the base member 101 has a radial dimension, i.e. its width Wioi, greater than its axial dimensions, i.e. its thickness T101.
  • the term "axial” refers to a direction which is parallel to an axis of rotation Xioo-X'ioo of a ball bearing 150 as hereafter described in relation with figure 3.
  • the term "radial” refers to a direction which is perpendicular to axis Xioo-X'ioo-
  • the base member 101 is flat i.e.
  • ring refers to an open ring, i.e. having a C-shaped base member.
  • other kinds of rings having a base member in the shape of a generally circular part, lie within the scope of the present invention, for instance closed ring i.e. having an O-shaped base member.
  • the ring 100 can also be a seeger ring.
  • Sensor 120 comprises a cable 122 and a sensor casing 121 , which encases some electronic components of sensor 120 and which holds cable 122.
  • Cable 122 serves as a means for transmitting information.
  • Ring 100 further comprises a protruding part 110.
  • Protruding part 110 is secured to base member 101.
  • Protruding part 110 projects or extends from base member 101 outwards, both in radial and axial directions.
  • protruding part 110 is made integral with base member 101.
  • a ring according to the invention comprises a circular part, e.g. base member 101 , and a part that is generally not circular, e.g. protruding part 110. Therefore, the term “ring” herein refers to an object which is not completely circular.
  • Protruding part 110 comprises a proximal element 111 , a median element 112 and a distal element 1 13.
  • proximal refers to the distance to base member 101 .
  • the proximal element 1 11 extends radially inwards from the inner radial surface of base member 101.
  • the distal element 113 extends axially.
  • the median element 1 12 joins the distal element 113 to the proximal element 11 1.
  • protruding part 110 has a cross section in the shape of a hook.
  • sensor 120 is mounted on protruding part 110. More accurately, sensor casing 121 is over-molded on distal element 113. Protruding part 110 hence forms attaching means for setting the sensor 120 fixed with respect to base member 101. After its assembly with base member 101 , the sensor 120 is remote from the base member 101 and from its legs 102 and 103. Sensor 120 and base member 101 are separated by a distance D120 which extends axially with respect to axis Xioo-X'ioo- Protruding part 110 extends symmetrically with respect to a plane Pi comprising axis X100 - X'100 and separating base member 101 into equal legs 102 and 103. Base member 101 is also symmetric with respect to plane Pi .
  • Figure 3 illustrates a system 150 comprising a ball bearing 160, the ring 100 of figures 1 and 2, a shaft 151 and a case 152.
  • the shaft 151 is fast in rotation with an inner ring 161 of ball bearing 160.
  • the case 152 is fast in rotation with an outer ring 163 of ball bearing 150.
  • Balls 162 are located between inner ring 161 and outer ring 163.
  • System 150 further comprises a target 154, or encoder washer, which is rotatable around axis Xioo-X'ioo- Target 154 is formed of an annular ring mounted on a holder 155, the latter being fastened to shaft 151.
  • sensor 120 is arranged and configured to read along a radial direction Yioo-Y'ioo-
  • Target 154 can be made in any conventional manner and matter.
  • target 154 can comprise a magnetic or magnetized multipolar ring.
  • Sensor 120 is selected in a group comprising a magnetic sensor, a capacitive sensor, an inductive sensor, etc.
  • the sensor can be optical and read an optical pattern of the target 154.
  • Case 152 has a radial groove 153, which is configured to receive ring 100.
  • the radial outer part of ring 100 fits in groove 153.
  • Ring 100 thus forms an axial stop for ball bearing 160 with respect to case 152.
  • Ring 100 is configured to stand axial stresses from system 150, in particular from ball bearings 160 and case 152.
  • shaft 151 rotates around axis X100 - X'100 together with the inner ring 161 of ball bearing 160 and with holder 155 and target 154.
  • Ring 100 stands the axial loads transmitted between inner ring 161 and outer ring 163.
  • Sensor 120 reads or detects target 154 and transmits data through cable 122 to a not shown remote control unit. These data can pertain to the rotation speed and/or to the rotation angle of shaft 151.
  • Figures 4, 5 and 6 depict a ring 200 and a system 250 according to a second embodiment of the invention.
  • the description of the ring and of the system 150 given above with reference to figures 1 , 2 and 3 can be transposed to the ring 200 and to the system 250 of the figures 4 to 6, which are similar thereto, except the hereafter stated differences.
  • An element of ring 200 or of the system 250 that is identical to or that correspond to an element of ring 100 or of the system 150 is given the same numerical reference plus 100.
  • Ring 200 differs from ring 100 by the form of protruding part 210 and by the configuration of sensor 220 with respect to protruding part 210.
  • the median element 212 and the distal element 213 of protruding part 210 have a U-shaped cross section.
  • protruding part 210 extends symmetrically with respect to plane P 2 .
  • Protruding part 210 thus defines a housing 214 for casing 221.
  • Sensor 220 is molded within protruding part 210.
  • Ring 200 also differs from ring 100 because base member 201 forms a snap ring of the external type. As can be seen on figure 6, the inner radial part of base member 201 fits in an external radial groove 253 machined on shaft 251.
  • ring 200 differs from ring 100 because sensor 220 is configured to read along an axial direction.
  • Target 254 has an annular shape, which extends radially, unlike target 154 which extends axially.
  • Target 254 is directly borne by ball bearing 260, for instance by a sealing device for sealing the bearing such as described in WO 2006/087337 or WO 2006/087469.
  • the sensor 220 After its assembly with base member 201 , the sensor 220 is remote from the base member 201 and from its legs 202 and 203. Sensor 220 and base member 201 are separated by a distance D 220 which extends axially with respect to axis X 2 oo-X'2oo- Ring 200 forms an axial stop for ball bearing 260 with respect to shaft 251.
  • ring 200 stands the axial loads transmitted between inner ring 261 and outer ring 263 of ball bearing 260.
  • Sensor 220 reads target 254 and transmits data through cable 222 to a not shown remote control unit.
  • the remote arrangement of the sensor and the configuration of the protruding part with respect to the base member permits to keep the elasticity of the ring 100 or 200 as high as possible without creating mechanical stresses in the sensor casing that may damage the sensor 220.
  • a ring according to the invention provides a security function to the bearing system by standing the axial loads while axially stopping the rolling bearing. Such a ring thus prevents loads to reach and damage the sensor, which is usually weak.
  • the protruding part extends only in a radial direction or only in an axial direction.
  • the protruding part can be non-unitary with the base member and fastened to the base member, e.g. by adhesion or by welding.
  • the protruding part can be snapped onto the base member.
  • the ring is a closed ring with an O-shape and serves as a static sealing device for preventing contaminants to reach the ring of the rolling bearing against which it rests.
  • the ring may comprise several sensing elements or sensors, say two, fastened on one or several protruding parts, say two.
  • the cable of the sensor means may extend axially instead of extending radially, like cable 122, or tangentially, like cable 222.
  • cable 122 or 222 may be replaced by any equivalent means for transmitting information, like a connector or even an antenna for achieving wireless transmission.
  • the protruding part may extend on the whole inner or outer contour of the base member.
  • the invention has been described in relation with a rolling bearing having balls as rolling components. However, the invention also applies to other types of rolling components, like rollers or needles for instance.

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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 ring (100), for a rolling bearing system, comprises: - a generally circular base member (101 ), - at least one sensing element (120) configured to read a target rotatable around an axis of rotation (Xioo-X'ioo), This ring (100) further comprises attaching means (110) for setting said sensing element (120) fixed with respect to said base member (101 ).

Description

RING FOR A ROLLING BEARING SYSTEM AND ROLLING BEARING SYSTEM COMPRISING SUCH A RING
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a ring for a rolling bearing system. Besides, the present invention relates to a rolling bearing system comprising such a ring.
BACKGROUND ART OF THE INVENTION
EP-A-O 495 323 discloses an integral ring comprising a sensor means which include a sensor and a circular body, as an integral unit. The sensor means of EP-A-O 495 323 is secured to a receiving means arranged into a ball-bearing. This structure of the ring of EP-A-O 495 323 implies a quite complicated and expensive production of such a sensor means, with the circular body integral with the sensor. Besides, the arrangement of the circular body into a rolling bearing results in a relatively low serviceability. Furthermore, such a sensor means requires a special rolling bearing with a counterbore for housing the circular body. The assembly of the ring and the rolling bearing is difficult, hence expensive.
SUMMARY OF THE INVENTION
One object of the present invention is to solve the here-above described problems, by providing a ring which is cost-effective, easy to produce and to incorporate into a rolling bearing system and which provides a high serviceability of the sensor.
The object is achieved by a ring for a rolling bearing system comprising, said ring comprising:
- a generally circular base member,
- at least one sensing element configured to read a target rotatable around an axis of rotation of said rolling bearing,
Said ring further comprises attaching means for setting said sensing element fixed with respect to said base member.
According to other advantageous but optional features of the present invention, considered on their own or in any technically possible combination: - said ring is a snap ring having a C-shape and configured to stand axial stresses from said system, said snap ring having two legs defining said base member,
- said snap ring is of the internal type,
- said snap ring is of the external type,
- said base member has a radial dimension greater than its axial dimension,
- said attaching means comprise at least one protruding part projecting from said base member, said sensor being mounted on said protruding part, so that said sensing element is remote from said base member,
- said sensing element is separated from said base member by a distance which extends axially with respect to said axis of rotation,
- said sensing element is separated from said base member by a distance which extends radially with respect to said axis of rotation,
- said protruding part extends in a radial direction with respect to said base member,
- said protruding part extends in an axial direction with respect to said base member,
- protruding part is made integral with said base member,
- said base member is symmetric around said axis of rotation and said protruding part extends symmetrically with respect to a plane comprising said axis of rotation,
- said sensing element is over-moulded on said attaching means,
- said sensing element is configured to read along an axial direction and/or along a radial direction.
- said sensing element is selected in the group comprising a magnetic sensor, a capacitive sensor, an inductive sensor or an optical sensor.
Besides, a subject matter of the invention is a rolling bearing system comprising:
- a rolling bearing,
- a shaft fast in rotation with an inner ring of a rolling bearing,
- a case fast in rotation with an outer ring of said rolling bearing, Said rolling bearing system further comprises at least one ring as here-above described and said case or said shaft has a radial groove configured to receive said ring.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention and its advantages will be well understood on the basis of the following description, which is given as an illustrative example without restricting the scope of the invention and in relation with the annexed drawings among which:
- figure 1 is a perspective view of a ring according to a first embodiment of the invention,
- figure 2 is an exploded perspective view of the ring of figure 1 ,
- figure 3 is a truncated perspective view of a rolling bearing system according to a first embodiment of the invention and comprising the ring of figure 1 ,
- figure 4 is a view analogous to figure 1 for a ring according to a second embodiment of the invention,
- figure 5 is a view analogous to figure 2 of the ring of figure 4, and
- figure 6 is a view analogous to figure 3 of a system according a second embodiment of the invention and comprising the ring of figure 4.
DETAILED DESCRIPTION OF SOME EMBODIMENTS
Figure 1 depicts a ring 100 comprising a base member 101 and a sensor 120. Figure 2 shows base member 101 and sensor 120 before their assembly to form ring 100. Ring 100 herein forms a snap ring of the internal type. The dimensions and material of ring 100 and of base member 101 are purposely selected to provide elasticity. The base member 101 can be made of plastic or of metal.
The base member 101 is of a generally circular shape. The base member 101 has two curved legs 102 and 103 which define a C-shape and an opening 104 between their cantilevered ends. The base member 101 has a radial dimension, i.e. its width Wioi, greater than its axial dimensions, i.e. its thickness T101. The term "axial" refers to a direction which is parallel to an axis of rotation Xioo-X'ioo of a ball bearing 150 as hereafter described in relation with figure 3. The term "radial" refers to a direction which is perpendicular to axis Xioo-X'ioo- The base member 101 is flat i.e. relatively thin along axis Xioo-X'ioo- In relation with figures 1 to 6, the term "ring" refers to an open ring, i.e. having a C-shaped base member. In addition, other kinds of rings, having a base member in the shape of a generally circular part, lie within the scope of the present invention, for instance closed ring i.e. having an O-shaped base member. The ring 100 can also be a seeger ring.
Sensor 120 comprises a cable 122 and a sensor casing 121 , which encases some electronic components of sensor 120 and which holds cable 122. Cable 122 serves as a means for transmitting information.
Ring 100 further comprises a protruding part 110. Protruding part 110 is secured to base member 101. Protruding part 110 projects or extends from base member 101 outwards, both in radial and axial directions. Actually, protruding part 110 is made integral with base member 101. A ring according to the invention comprises a circular part, e.g. base member 101 , and a part that is generally not circular, e.g. protruding part 110. Therefore, the term "ring" herein refers to an object which is not completely circular.
Protruding part 110 comprises a proximal element 111 , a median element 112 and a distal element 1 13. The terms "proximal", "median" and "distal" refer to the distance to base member 101 . The proximal element 1 11 extends radially inwards from the inner radial surface of base member 101. The distal element 113 extends axially. The median element 1 12 joins the distal element 113 to the proximal element 11 1. Actually protruding part 110 has a cross section in the shape of a hook.
As can be seen from figures 1 and 2, sensor 120 is mounted on protruding part 110. More accurately, sensor casing 121 is over-molded on distal element 113. Protruding part 110 hence forms attaching means for setting the sensor 120 fixed with respect to base member 101. After its assembly with base member 101 , the sensor 120 is remote from the base member 101 and from its legs 102 and 103. Sensor 120 and base member 101 are separated by a distance D120 which extends axially with respect to axis Xioo-X'ioo- Protruding part 110 extends symmetrically with respect to a plane Pi comprising axis X100 - X'100 and separating base member 101 into equal legs 102 and 103. Base member 101 is also symmetric with respect to plane Pi .
Figure 3 illustrates a system 150 comprising a ball bearing 160, the ring 100 of figures 1 and 2, a shaft 151 and a case 152. The shaft 151 is fast in rotation with an inner ring 161 of ball bearing 160. The case 152 is fast in rotation with an outer ring 163 of ball bearing 150. Balls 162 are located between inner ring 161 and outer ring 163.
System 150 further comprises a target 154, or encoder washer, which is rotatable around axis Xioo-X'ioo- Target 154 is formed of an annular ring mounted on a holder 155, the latter being fastened to shaft 151. As can be seen on figure 3, sensor 120 is arranged and configured to read along a radial direction Yioo-Y'ioo-
Target 154 can be made in any conventional manner and matter. For instance, target 154 can comprise a magnetic or magnetized multipolar ring. Sensor 120 is selected in a group comprising a magnetic sensor, a capacitive sensor, an inductive sensor, etc. Alternatively, the sensor can be optical and read an optical pattern of the target 154.
Case 152 has a radial groove 153, which is configured to receive ring 100. The radial outer part of ring 100 fits in groove 153. Ring 100 thus forms an axial stop for ball bearing 160 with respect to case 152. Ring 100 is configured to stand axial stresses from system 150, in particular from ball bearings 160 and case 152.
When system 150 is in operation, shaft 151 rotates around axis X100 - X'100 together with the inner ring 161 of ball bearing 160 and with holder 155 and target 154. Ring 100 stands the axial loads transmitted between inner ring 161 and outer ring 163. Sensor 120 reads or detects target 154 and transmits data through cable 122 to a not shown remote control unit. These data can pertain to the rotation speed and/or to the rotation angle of shaft 151.
Figures 4, 5 and 6 depict a ring 200 and a system 250 according to a second embodiment of the invention. The description of the ring and of the system 150 given above with reference to figures 1 , 2 and 3 can be transposed to the ring 200 and to the system 250 of the figures 4 to 6, which are similar thereto, except the hereafter stated differences. An element of ring 200 or of the system 250 that is identical to or that correspond to an element of ring 100 or of the system 150 is given the same numerical reference plus 100.
One can thus define a base member 201 , legs 202 and 203 and an opening 204, an axis of rotation X2oo-X'2oo, a protruding part 210 comprising a proximal element 211 , a median element 212 and a distal element 213, and plane P2, a sensing element or a sensor 220 comprising a casing 221 and a cable 222, a shaft 251 , a case 252, a groove 253, a target or encoder washer 254 and a ball bearing 260 comprising an inner ring 261 , balls 262 and an outer ring 263.
Ring 200 differs from ring 100 by the form of protruding part 210 and by the configuration of sensor 220 with respect to protruding part 210. As can be seen on figures 4 and 5, the median element 212 and the distal element 213 of protruding part 210 have a U-shaped cross section. Besides, like protruding part 110, protruding part 210 extends symmetrically with respect to plane P2. Protruding part 210 thus defines a housing 214 for casing 221. Sensor 220 is molded within protruding part 210.
Ring 200 also differs from ring 100 because base member 201 forms a snap ring of the external type. As can be seen on figure 6, the inner radial part of base member 201 fits in an external radial groove 253 machined on shaft 251.
Besides, ring 200 differs from ring 100 because sensor 220 is configured to read along an axial direction. Target 254 has an annular shape, which extends radially, unlike target 154 which extends axially. Target 254 is directly borne by ball bearing 260, for instance by a sealing device for sealing the bearing such as described in WO 2006/087337 or WO 2006/087469. After its assembly with base member 201 , the sensor 220 is remote from the base member 201 and from its legs 202 and 203. Sensor 220 and base member 201 are separated by a distance D220 which extends axially with respect to axis X2oo-X'2oo- Ring 200 forms an axial stop for ball bearing 260 with respect to shaft 251.
When system 250 is in operation, ring 200 stands the axial loads transmitted between inner ring 261 and outer ring 263 of ball bearing 260. Sensor 220 reads target 254 and transmits data through cable 222 to a not shown remote control unit.
The remote arrangement of the sensor and the configuration of the protruding part with respect to the base member permits to keep the elasticity of the ring 100 or 200 as high as possible without creating mechanical stresses in the sensor casing that may damage the sensor 220.
Moreover, a ring according to the invention provides a security function to the bearing system by standing the axial loads while axially stopping the rolling bearing. Such a ring thus prevents loads to reach and damage the sensor, which is usually weak.
According to non shown embodiments, the protruding part extends only in a radial direction or only in an axial direction.
According to another non shown embodiment, the protruding part can be non-unitary with the base member and fastened to the base member, e.g. by adhesion or by welding. Alternatively, the protruding part can be snapped onto the base member.
According to a further non shown embodiment, the ring is a closed ring with an O-shape and serves as a static sealing device for preventing contaminants to reach the ring of the rolling bearing against which it rests.
According to further non shown embodiments, the ring may comprise several sensing elements or sensors, say two, fastened on one or several protruding parts, say two.
The cable of the sensor means may extend axially instead of extending radially, like cable 122, or tangentially, like cable 222. Alternatively, cable 122 or 222 may be replaced by any equivalent means for transmitting information, like a connector or even an antenna for achieving wireless transmission.
According to another non shown embodiment, the protruding part may extend on the whole inner or outer contour of the base member.
The invention has been described in relation with a rolling bearing having balls as rolling components. However, the invention also applies to other types of rolling components, like rollers or needles for instance.

Claims

1. Ring (100 ; 200), for a system (150 ; 250) comprising a rolling bearing (160 ; 260), said ring (100 ; 200) comprising: a generally circular base member (101 ; 201 ), at least one sensing element (120 ; 220) configured to read a target rotatable around an axis of rotation (Xioo-X'ioo ; X2oo-X'2oo) of said rolling bearing (160 ;
260), said ring (100 ; 200) being characterized in that it further comprises attaching means (110 ; 210) for setting said sensing element (120 ; 220) fixed with respect to said base member (101 ; 201 ).
2. Ring (100 ; 200) according to claim 1 , characterized in that said ring (100 ; 200) is a snap ring having a C-shape and which is configured to stand axial stresses from said system (150 ; 250), said snap ring having two legs (202, 203 ; 202,203) defining said base member (101 ; 201 )
3. Ring (100) according to claim 2, characterized in that said snap ring is of the internal type.
4. Ring (100) according to claim 2, characterized in that said snap ring is of the external type.
5. Ring (100 ; 200) according to any preceding claim, characterized in that said base member (101 ; 201 ) has a radial dimension (W1Oi) greater than its axial dimension (T1Oi).
6. Ring (100 ; 200) according to any preceding claim, characterized in that said attaching means comprise at least one protruding part (110 ; 210) projecting from said base member (101 ; 201 ), said sensing element (120 ; 220) being mounted on said protruding part (110 ; 210), so that said sensing element (120 ; 220) is remote from said base member (101 ; 201 ).
7. Ring (100) according to claim 6, characterized in that said sensing element (120) is separated from said base member (101 ) by a distance (Di2o) which extends parallel to said axis of rotation (X1 Oo - X'ioo)-
8. Ring (200) according to claim 6, characterized in that said sensing element (220) is separated from said base member (201 ) by a distance (D22o) which extends perpendicular to said axis of rotation (X2oo - X'2oo)-
9. Ring (100 ; 200) according to claim 8, characterized in that said protruding part (110 ; 210) extends in a radial direction (Yioo-Y'ioo) with respect to said base member (101 ; 201 ).
10. Ring (100 ; 200) according to any of claims 8 to 9, characterized in that said protruding part (110 ; 210) extends in an axial direction (Xioo-X'ioo ; X200-X 200) with respect to said base member (101 ; 201 ).
11. Ring (100 ; 200) according to any of claims 8 to 10, characterized in that said protruding part (110 ; 210) is made integral with said base member (101 ; 201 ).
12. Ring (100 ; 200) according to any of claims 8 to 11 , characterized in that said base member (101 ; 201 ) is symmetric around said axis of rotation (X1Oo- X' 100 ; X2oo-X'2oo) and in that said protruding part (110 ; 210) extends symmetrically with respect to a plane (P1 ; P2) comprising said axis of rotation (X1Oo-X' 100 ; X200-
13. Ring (100 ; 200) according to any preceding claim, characterized in that said sensing element (120 ; 220) is over-moulded on said attaching means (110 ; 210).
14. Ring (100 ; 200) according to any preceding claim, characterized in that said sensing element (120 ; 220) is configured to read along an axial direction (X2oo-X'2oo) and/or along a radial direction (Y1Oo-Y1IOo)-
15. Ring (100 ; 200) according to any preceding claim, characterized in that said sensing element (120 ; 220) is selected in the group comprising a magnetic sensor, a capacitive sensor an inductive sensor and an optical sensor.
16. Rolling bearing system (150 ; 250) comprising: a rolling bearing (160 ; 260), a shaft (151 ; 251 ) fast in rotation with an inner ring (161 ; 261 ) of a rolling bearing (160 ; 260), a case (152 ; 252) fast in rotation with an outer ring (163 ; 263) of said rolling bearing (160 ; 260), said rolling bearing system (150 ; 250) being characterized in that it further comprises at least one ring (100 ; 200) according to any preceding claim and in that said case (152 ; 252) or said shaft (151 ; 251 ) has a radial groove (153 ; 253) configured to receive said ring (100 ; 200).
PCT/IB2009/052789 2009-04-08 2009-04-08 Ring for a rolling bearing system and rolling bearing system comprising such a ring WO2010116208A1 (en)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2009/052789 WO2010116208A1 (en) 2009-04-08 2009-04-08 Ring for a rolling bearing system and rolling bearing system comprising such a ring

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014048454A1 (en) * 2012-09-25 2014-04-03 Aktiebolaget Skf Rolling bearing assembly and electric motor comprising such a rolling bearing assembly
JP2017032327A (en) * 2015-07-30 2017-02-09 Ntn株式会社 Bearing with rotation detector
WO2019207103A1 (en) * 2018-04-26 2019-10-31 Ntn-Snr Roulements Roller bearing
CN112135982A (en) * 2018-04-26 2020-12-25 Ntn-Snr轴承股份有限公司 Rolling bearing
US12025187B2 (en) 2018-04-26 2024-07-02 Ntn-Snr Roulements Roller bearing

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4915512A (en) * 1989-03-24 1990-04-10 The Torrington Company Thrust bearing with a magnetic field sensor
EP0495323A1 (en) * 1991-01-15 1992-07-22 Snr Roulements Roller bearing with sensor
US20030142891A1 (en) * 2002-01-31 2003-07-31 Ntn Corporation Bearing with rotational sensor
WO2006087339A1 (en) * 2005-02-15 2006-08-24 Aktiebolaget Skf A sealing device with an integrated encoder for bearings
WO2006122915A1 (en) * 2005-05-16 2006-11-23 Aktiebolaget Skf A device for assembling and disassembling a sensor in a bearing unit

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4915512A (en) * 1989-03-24 1990-04-10 The Torrington Company Thrust bearing with a magnetic field sensor
EP0495323A1 (en) * 1991-01-15 1992-07-22 Snr Roulements Roller bearing with sensor
US20030142891A1 (en) * 2002-01-31 2003-07-31 Ntn Corporation Bearing with rotational sensor
WO2006087339A1 (en) * 2005-02-15 2006-08-24 Aktiebolaget Skf A sealing device with an integrated encoder for bearings
WO2006122915A1 (en) * 2005-05-16 2006-11-23 Aktiebolaget Skf A device for assembling and disassembling a sensor in a bearing unit

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014048454A1 (en) * 2012-09-25 2014-04-03 Aktiebolaget Skf Rolling bearing assembly and electric motor comprising such a rolling bearing assembly
JP2017032327A (en) * 2015-07-30 2017-02-09 Ntn株式会社 Bearing with rotation detector
WO2019207103A1 (en) * 2018-04-26 2019-10-31 Ntn-Snr Roulements Roller bearing
FR3080656A1 (en) * 2018-04-26 2019-11-01 Ntn-Snr Roulements BEARING BEARING
CN112119229A (en) * 2018-04-26 2020-12-22 Ntn-Snr轴承股份有限公司 Rolling bearing
CN112135982A (en) * 2018-04-26 2020-12-25 Ntn-Snr轴承股份有限公司 Rolling bearing
US12025187B2 (en) 2018-04-26 2024-07-02 Ntn-Snr Roulements Roller bearing

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