EP2417462A1 - Ensemble capteur pour système de palier de roulement et système de palier de roulement comprenant cet ensemble capteur - Google Patents

Ensemble capteur pour système de palier de roulement et système de palier de roulement comprenant cet ensemble capteur

Info

Publication number
EP2417462A1
EP2417462A1 EP09786460A EP09786460A EP2417462A1 EP 2417462 A1 EP2417462 A1 EP 2417462A1 EP 09786460 A EP09786460 A EP 09786460A EP 09786460 A EP09786460 A EP 09786460A EP 2417462 A1 EP2417462 A1 EP 2417462A1
Authority
EP
European Patent Office
Prior art keywords
rolling bearing
rotation
sensor assembly
axis
holding member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP09786460A
Other languages
German (de)
English (en)
Inventor
Franck Landrieve
Sylvain Chaussat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF AB
Original Assignee
SKF AB
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 SKF AB filed Critical SKF AB
Publication of EP2417462A1 publication Critical patent/EP2417462A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • F16C35/042—Housings for rolling element bearings for rotary movement
    • F16C35/045—Housings for rolling element bearings for rotary movement with a radial flange to mount the 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 sensor assembly for a rolling bearing system. Besides, the present invention relates to a rolling bearing system comprising such a sensor assembly.
  • US-A-4 946 296 discloses a rolling bearing system having a casing housing a ball bearing and a sensor assembly comprising a sensor and a holding member for holding the sensor.
  • the holding member is fitted both into the casing and into the outer ring of the ball bearing.
  • the construction of the rolling bearing system of US-A-4 946 296 requires that the rolling bearing be machined with a special shape, in particular with several shoulders made into the casing. Such a construction induces difficult and expensive production and assembly of the rolling bearing system.
  • fitting the holding member both into the casing and into the outer ring hinders the application of an axial preload on the rolling bearing.
  • the serviceability of the sensor is quite low and it requires an accurate, hence expensive, dismantling of the rolling bearing system.
  • One object of the present invention is to alleviate the here-above described problems by providing a sensor assembly and a rolling bearing system which are cost-effective and easy to produce and to assemble and which provide a high serviceability of the sensor.
  • a sensor assembly for a rolling bearing system comprising a rolling bearing, said sensor assembly comprising a sensor unit holding at least one sensing element arranged to read a target rotatable around an axis of rotation of said rolling bearing.
  • Said sensor assembly is characterized in that it further comprises: a holding member for holding said sensor unit, said holding member having a shape configured to be housed in an internal volume of a casing for housing said rolling bearing apart from said sensor assembly, attaching means to removably attach said sensor unit to said holding member.
  • the sensor assembly is self-supporting, it can be mounted apart from the rolling bearing and it permits the application of a preloading on the rolling bearing.
  • said sensor unit and said holding member have a generally rotational symmetry around said axis of rotation;
  • said holding member has an annular outer surface in the shape of a cylinder;
  • said attaching means comprise:
  • said attaching means comprise three protrusions and three guide slots, said protrusions and said guide slots respectively being evenly distributed around said axis of rotation;
  • said holding member is made of a metallic material
  • a subject matter of the present invention is a rolling bearing system comprising: a rolling bearing, a shaft fast in rotation with an inner ring of said rolling bearing, - a casing fast in rotation with an outer ring of said rolling bearing, said rolling bearing system being characterized in that it further comprises at least one sensor assembly according to any preceding claim and in that said rolling bearing and said sensor assembly are housed, apart from each other, in an internal volume of said casing.
  • said internal volume is a cylindrical bore, said holding member being press-fitted into said cylindrical bore;
  • said rolling bearing system further comprises a support member for holding at least one target rotatable around an axis of rotation of said rolling bearing, said support member having a generally rotational symmetry around said axis of rotation and being fast in rotation with said shaft and/or with said inner ring;
  • said support member has a U-shaped cross section, considered in a plane comprising said axis of rotation, with its cantilever wings extending generally parallel to said axis of rotation and with its annular base plate contacting said inner ring, said target being fixed on one of said cantilever wings;
  • said rolling bearing system further comprises a spring washer for preloading said rolling bearing at least along a direction parallel to said axis of rotation, said spring washer being located, along a direction parallel said axis of rotation, between said rolling bearing and said sensor assembly; - said spring washer is a Belleville washer; and
  • said sensing element is configured to read along an axial direction and/or along a radial direction.
  • FIG. 1 is a perspective view from one side of a rolling bearing system according to the invention
  • - figure 2 is a perspective view from the other side, opposite to figure 1 , of the rolling bearing system of figure 1
  • - figure 3 is an exploded perspective view of the rolling bearing system of figure 1
  • figure 4 is a cross-section of the rolling bearing system of figure 1 along plane IV at figure 1.
  • Figures 1 and 2 depict a rolling bearing system 1 comprising a ball bearing 2, a shaft 3, a casing 4 and a sensor assembly 5.
  • ball bearing 2 includes balls 23 arranged to roll between an inner ring 21 and an outer ring 22.
  • the shaft 3 is fast in rotation with the inner ring 21.
  • Shaft 3 and inner ring 21 can rotate around an axis of rotation X 2 -X' 2 .
  • the outer ring 22 is fast in rotation with the casing 4.
  • Outer ring 22 fits into a bore 43 of casing 4.
  • Bore 43 has a cylindrical shape.
  • Casing 4 has a cylindrical part 41 extending mainly axially, i.e.
  • sensor assembly 5 comprises a sensor unit 6 and a holding member 7.
  • Figure 4 illustrates sensor unit 6 and holding member 7 when assembled to form sensor assembly 5.
  • Sensor unit 6 and holding member 7 have a generally rotational symmetry, i.e. annular forms, around axis X 2 -X' 2 .
  • the term "generally" refers to the overall shape, notwithstanding the local exceptions visible on figure 3.
  • sensor unit 6 comprises a sensor ring 61 which holds a sensing element or a sensor 62.
  • Sensor 62 is arranged to detect or read a target 85 which is rotatable around axis X 2 -X' 2 .
  • Sensor unit 6 has a generally rectangular section in a plane comprising axis X 2 -X' 2 , i.e. a meridian plane, like plane IV at figure 1.
  • Holding member 7 has an L-shaped cross-section along plane IV.
  • Holding member 7 has a first annular wing 71 which extends parallel to axis X 2 -X' 2 and a second annular wing 72 which extends beside sensor unit 6 and in a radial direction Y 2 -V 2 -
  • the first annular wing 71 covers an annular outer surface 63 of sensor unit 6.
  • the first annular wing 71 and the annular outer surface 63 have corresponding diameters.
  • Holding member 7 is preferably made of a metallic material although it could be made of other type of material such as plastics.
  • the term "axial" refers to a direction which is parallel to the axis of rotation X 2 -X' 2 of ball bearing 2.
  • the term "radial” refers to a direction which is perpendicular to the axis of rotation X 2 -X' 2 .
  • the term “circumferential” refers to a direction which is orthogonal to the axis of rotation X 2 -X' 2 .
  • the radial outer surface 63 of sensor unit 6 has three protrusions, two of which are visible at figure 3 with references 64 and 65.
  • the protrusions 64, 65 and equivalent are evenly distributed around axis X 2 -X' 2 , i.e. at 120° angles from each other.
  • the protrusions are identical, as can be seen from protrusions 64, 65 and equivalent.
  • Each protrusion has a shape of an arcuate bean extending radially outwards from the radial outer surface 63 and in a circumferential or tangential direction.
  • Protrusions 64, 65 and equivalent are integral with sensor ring 61.
  • protrusions 64, 65 and equivalent can be fixed, e.g. stuck or glued, to sensor ring 61 .
  • holding member 7 has three guide slots 74, 75 and 76.
  • Guide slots 74 to 76 are evenly distributed around axis X 2 -X' 2 , i. e. at 120° angle from each other. Every guide-slot 74, 75 or 76 is made into the first wing 71 with an arcuate shape extending mainly in a circumferential or tangential direction. Every guide slot 74, 75 or 76 has the general shape of an L with an opening located opposite the second wing 72.
  • protrusions 64, 65 and equivalent are respectively inserted in guide slots 74, 75 and 76, so as to achieve a bayonet-type attachment between sensor unit 6 and holding member 7.
  • protrusions 64, 65 and equivalent and guide-slots 74, 75 and 76 together form attaching means 567 which permit to removably attach sensor 6 to holding member 7.
  • the holding member 7 is configured to fit into the bore 43.
  • holding member 7 has an annular outer surface in the shape of a cylinder. This annular outer surface of holding member 7 is fastened to bore 43 when the rolling bearing system 1 is in its assembled state of figures 1 , 2 or 4. In the example of figures 1 to 4, holding member is press-fitted into the bore 43.
  • the sensor assembly 5 and the ball bearing 2 are both secured to the cylindrical part 41 , with the outer ring 22 and the first wing 71 bearing against bore 43.
  • Cylindrical part 41 of casing 4 holds ball bearing 2 in bore 43 next to and apart from sensor assembly 5.
  • Holding member 7 serves to position and to hold sensor unit 6 fixed with respect to casing 4. Besides, holding member 7 acts as an axial stop for ball bearing 2.
  • the rolling bearing system 1 further comprises a support member 8 for holding target 85.
  • Support member 8 has a generally rotational symmetry around axis X 2 -X'2 with a U-shaped cross-section in a plane comprising axis X 2 -X' 2 like plane IV.
  • Support member 8 has an inner cantilever wing 81 , an outer cantilever wing 82 and a base 82 joining the inner cantilever wing 81 and the outer cantilever 83.
  • the inner cantilever wing 81 and the outer cantilever wing 83 both extend generally parallel to axis X 2 OC 2 , whereas base 82 extends in a radial direction.
  • Support member 8 is secured fast in rotation with shaft 3 and with inner ring 21 , by means of interference fit or gluing.
  • the target 85 is formed of an annular ring extending axially and fastened to the inner cantilever wing 81. As can be seen on figure 4, Sensor 62 protrudes inside support member 8 in front of target 85. Sensor 62 is thus arranged to read target 85 along a radial direction like axis Y 2 -V 2 .
  • Target 85 can be made in any conventional manner and matter.
  • target 85 can comprise a magnetized multipolar ring.
  • Sensor 62 is selected in a group comprising a magnetic sensor, a capacitive sensor, an inductive sensor or an optical sensor.
  • the rolling bearing system 1 further comprises a spring washer 9 which is located, along axis X 2 -X' 2 , between ball bearing 2 and sensor assembly 5.
  • Spring washer 9 is located, along a radial direction like axis X 2 -X' 2 , between support member 8 and cylindrical part 41. Since sensor assembly 5 is axially fixed with respect to casing 4, spring washer 9 permits to preload the ball bearing 2 along a direction parallel to axis X 2 -X ⁇ - In the example of figures 1 to 4, spring washer 9 is made of a Belleville washer.
  • shaft 3 rotates together with inner ring 21 and support member 8.
  • Target 85 rotates and generates electrical pulses into sensor 62. These electrical pulses constitute signals or data which is then transmitted via a cable 60. Cable 60 passes through a hole 44 made into the annular part 42.
  • a remote control unit not shown can receive the data to measure and/or calculate the rotational speed or a rotational angle of the rolling bearing system 1 .
  • the sensor unit of a sensor assembly according to the invention can be easily detached from the holding member. Therefore, the sensor has a high serviceability.
  • the casing has a shape that is relatively simple, which makes the rolling bearing system easy, hence not expensive, to produce, to assemble and to dismantle.
  • the ball bearing and the sensor assembly are housed or encased in the cylindrical bore without any shoulder.
  • a rolling bearing system according to the invention has a structure which keeps the rolling bearing apart and independent from the sensor assembly, thus permitting the application of a preloading on the rolling bearing, via the spring washer.
  • the attaching means comprise only two protrusions cooperating with only two guide slots, all being preferably at opposite locations around the axis of rotation.
  • the sensing element or sensor is arranged to read the target along an axial direction.
  • the invention has been describes in relation with a rolling bearing having balls as rolling components. However, the invention also applies to other kinds of rolling components, like rollers or needles for instance.

Landscapes

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

Abstract

L'invention concerne un ensemble capteur (5), comprenant un module capteur (6) maintenant un élément capteur (62) conçu pour lire une cible rotative (85), un élément de maintien (7) conçu pour maintenir le module capteur (6) et un moyen de fixation conçu pour fixer de façon amovible le module capteur (6) à l'élément de maintien (7). L'élément de maintien (7) possède une forme permettant sa réception dans un volume interne (43) d'un boîtier (4) destiné à recevoir un palier de roulement (2) à distance de l'ensemble capteur (5).
EP09786460A 2009-04-07 2009-04-07 Ensemble capteur pour système de palier de roulement et système de palier de roulement comprenant cet ensemble capteur Withdrawn EP2417462A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2009/052781 WO2010116204A1 (fr) 2009-04-07 2009-04-07 Ensemble capteur pour système de palier de roulement et système de palier de roulement comprenant cet ensemble capteur

Publications (1)

Publication Number Publication Date
EP2417462A1 true EP2417462A1 (fr) 2012-02-15

Family

ID=42226101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09786460A Withdrawn EP2417462A1 (fr) 2009-04-07 2009-04-07 Ensemble capteur pour système de palier de roulement et système de palier de roulement comprenant cet ensemble capteur

Country Status (2)

Country Link
EP (1) EP2417462A1 (fr)
WO (1) WO2010116204A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3809904C2 (de) * 1988-03-24 1998-12-10 Skf Gmbh Vorrichtung zur Abdichtung und Erzeugung von elektrischen Impulsen
IT1303083B1 (it) * 1998-07-27 2000-10-30 Skf Ind Spa Dispositivo per il montaggio di un sensore ad un gruppo cuscinetto diun assile ferroviario.
ITTO20050062U1 (it) * 2005-05-16 2006-11-17 Skf Ab Dispositivo di montaggio e smontaggio di un sensore di rotazione in un gruppo cuscinetto-mozzo
WO2009011129A1 (fr) * 2007-07-19 2009-01-22 Ntn Corporation Dispositif de palier ayant un capteur de vitesse de rotation et adapté pour une utilisation dans une roue et son procédé d'assemblage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010116204A1 *

Also Published As

Publication number Publication date
WO2010116204A1 (fr) 2010-10-14

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