EP1266228A1 - Instrumented antifriction bearing provided with a sealing device - Google Patents

Instrumented antifriction bearing provided with a sealing device

Info

Publication number
EP1266228A1
EP1266228A1 EP01913945A EP01913945A EP1266228A1 EP 1266228 A1 EP1266228 A1 EP 1266228A1 EP 01913945 A EP01913945 A EP 01913945A EP 01913945 A EP01913945 A EP 01913945A EP 1266228 A1 EP1266228 A1 EP 1266228A1
Authority
EP
European Patent Office
Prior art keywords
rotating
sensor
sensor means
sealing means
rotating ring
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Withdrawn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
EP01913945A
Other languages
German (de)
French (fr)
Inventor
Franck Landrieve
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 France
Original Assignee
SKF France
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 France filed Critical SKF France
Publication of EP1266228A1 publication Critical patent/EP1266228A1/en
Withdrawn legal-status Critical Current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
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7859—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element
    • F16C33/7863—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element mounted to the inner race, e.g. a flinger to use centrifugal effect
    • 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 the field of instrumented rolling bearings fitted with a set for detecting rotation parameters such as angular rotation, direction of rotation, speed, and / or acceleration.
  • rotation parameters such as angular rotation, direction of rotation, speed, and / or acceleration.
  • an instrumented bearing generally comprises a detection assembly consisting of a sensor secured to the non-rotating ring of the bearing and an encoder secured to the rotating ring of the bearing.
  • the encoder rotates in front of the sensor so that the sensor generates a signal representative of the parameters of rotation of the encoder, for example a sinusoidal or square electrical signal whose frequency is proportional to the speed of rotation of the encoder.
  • the encoder can be of the multipolar or optical magnetic type and operates in cooperation with a sensor of the corresponding type, that is to say magnetosensitive for a magnetic encoder and optical for an optical encoder.
  • the sensor and the encoder are arranged on one side of the bearing, each being fixed to the corresponding ring by means of a support.
  • Each of the supports is fixed by fitting onto a cylindrical surface of the corresponding ring, machined for this purpose.
  • seals are provided on each side of said bearing.
  • a seal formed by a metal flange on which a flexible portion is overmolded is fixed in an annular groove of the outer ring.
  • a lip from the flexible portion rubs against a friction surface of the inner ring.
  • a seal also composed of a metal flange and a flexible portion is fixed to a bore of the sensor support. A lip from the flexible portion rubs against a friction surface of the support of the encoder means.
  • the object of the present invention is to remedy the drawbacks of the devices of the prior art.
  • the object of the present invention is to provide an instrumented rolling bearing whose rings are of the standard type intended to be used both with or without a detection assembly, and comprising a seal between the rolling elements and the air gap situated between the sensor and the encoder.
  • the instrumented rolling bearing device is of the type provided with a non-rotating part comprising a non-rotating ring and a sensor means, a rotating part comprising a rotating ring and an encoder means, and at least one row of rolling elements arranged between two raceways of the non-rotating and rotating rings, the sensor means being fixed in a groove of the non-rotating ring arranged near a radial lateral face of said non-rotating ring.
  • the non-rotating part further comprises a sealing means disposed axially between the sensor means and the rolling elements substantially at the level of the groove, the sealing means being distinct from the sensor means.
  • the sensor means can be fixed in a standard groove suitable for receiving in other uses a seal.
  • the encoder means can be fixed on a standard surface of the rotating ring able to cooperate in other uses with a seal.
  • the air gap between the encoder and the sensor is effectively isolated from the lubricant placed in the bearing.
  • the non-rotating ring comprises two grooves arranged on one side and on the other of the rolling elements.
  • the profile of the two grooves can be identical.
  • the non-rotating ring can be symmetrical with respect to a plane passing through the center of the rolling elements.
  • the sensor means comprises a support, part of which is disposed in said groove of the non-rotating ring for fixing said sensor means on said non-rotating ring.
  • the part disposed in said groove may be of diameter greater than that of the rest of the support.
  • the sensor support is here mounted in place of a conventional bearing seal.
  • the sealing means is arranged radially between a support of the sensor means and the rotating ring.
  • the sealing means comprises a substantially radial portion of annular shape and a hooking portion in contact with the sensor means.
  • the attachment portion can cooperate with the support of the sensor means.
  • the attachment portion can be mounted with a radial clamping on the sensor means.
  • the attachment portion of the sealing means is also in contact with the non-rotating ring.
  • the attachment portion of the sealing means comprises a bead of flexible material.
  • the bead can be projecting in said groove and in contact with both the support of the sensor means and the non-rotating ring. The bead can contribute to maintaining the support of the sensor means in place.
  • the attachment portion of the sealing means comprises an oblique flange issuing from the substantially radial portion.
  • the sensor means comprises an opening for mounting the sealing means, situated opposite the rolling elements and allowing the introduction of said sealing means into the sensor means in the direction of the rolling elements.
  • the present invention also relates to a method of mounting an instrumented rolling bearing.
  • the bearing is of the type provided with a non-rotating part comprising a non-rotating ring and a sensor means, a rotating part comprising a rotating ring and an encoder means, and at least one row of rolling elements arranged between two raceways of the non-rotating and rotating rings, in which there is a sealing means axially between the sensor means and the rolling elements, the sealing means being distinct from the sensor means, the sensor means being fixed in a groove of the non-rotating ring disposed near a radial lateral face of said non-rotating ring, the sealing means being disposed substantially at the level of the groove.
  • the sealing means can come to tighten radially on the sensor means.
  • the sealing means can be mounted by an opening of the sensor means situated opposite the rolling elements.
  • the support of the sensor means can be mounted, then the sealing means, then the rest of the sensor means, said support leaving an opening for passage of the sealing means.
  • FIG. 1 is an axial sectional view of a rolling bearing according to a first embodiment of the invention
  • FIG. 2 is an enlarged partial view of the rolling bearing of Figure 1;
  • Figure 3 is a variant of Figure 2;
  • FIG. 4 is an axial sectional view of a rolling bearing according to a second embodiment of the invention.
  • FIG. 5 is an enlarged partial view of the rolling bearing of Figure 4.
  • Figure 6 is a variant of Figure 5.
  • a bearing 1 comprises an outer ring 2 provided with a raceway 3, an inner ring 4 provided with a raceway 5, a row of rolling elements 6, here balls, arranged between the raceways 3 and 5, a cage 7 for maintaining the circumferential spacing of the rolling elements 6 and a seal 8 mounted on the outer ring 2 and coming into friction with a cylindrical surface 4a of the inner ring 4 while being disposed radially between said two rings 2 and 4 and axially between the row of rolling elements 6 and one of the lateral surfaces of said rings 2, 4.
  • the seal 8 is mounted in a annular groove 9 formed in the outer ring 2 near its radial lateral surface 2a.
  • the outer ring 2 is also provided with a groove 10 symmetrical with the groove 9 with respect to a plane passing through the center of the rolling elements 6.
  • the groove 10 comprises a substantially cylindrical surface 10a adjacent to the radial lateral surface 2a, a concave surface 10b forming the bottom of said groove 10, and an oblique surface 10c situated on the side of the rolling elements 6 and connecting to the bore 2b of the outer ring 2.
  • a sensor block referenced 11 as a whole is mounted on the outer ring 2 on the side of the groove 10.
  • the sensor block 1 1 comprises a metal support 12, a metal cover 13, and a sensor element 14 embedded in a central part made of material synthetic 15.
  • the metal support 12 of generally annular shape, comprises a radial wall 12a in contact with a radial front surface 2a of the outer ring 2 on the side of the groove 10 and is extending on its internal edge by a substantially tubular rim 12b in contact with the surface 10a of the groove 10 and whose free end 12c is folded radially outward in the groove 10 and ensures the attachment of the support 12 on the ring exterior 2.
  • the free end 12c has a frustoconical shape.
  • the metal support 12 also comprises a cylindrical part 12d extending from the outer edge of the radial part 12a axially opposite the bearing 1 and ending in a flange 12e slightly bent obliquely inside.
  • the cylindrical part 12d is provided with a notch 12f.
  • the metal cover 13 has a general disc shape with a large diameter end 13a slightly bent towards the outer ring 2 and cooperating with the rim 12e of the cylindrical part 12d, said rim 12e ensuring the maintenance of the cover 13 by tightening around the end 13 a.
  • the central part 15 is, outside the area of the notch
  • An encoder 16 comprises an annular support 17 and an active part 18.
  • the support 17 is of annular shape with T section and includes a radial portion 17a axially in contact with a radial front surface 4b of the inner ring 4 on the same side as the sensor block 1 1 and a cylindrical portion 17b extending from the outer edge of the radial portion 17a axially on both sides while being fitted on the side of the inner ring 4 on a cylindrical bearing surface 4c of said inner ring 4.
  • the bearing surface 4c is preferably symmetrical with the bearing 4a with respect to a radial plane passing through the center of the rolling elements 6.
  • the active part 18 of the encoder 16 is of annular shape of generally rectangular section arranged on the outer periphery of the cylindrical portion 17b.
  • the active part 18 extends axially in the direction of the rolling elements 6 beyond the radial portion 17a between the outer 2 and inner 4 rings, substantially up to the level of the groove 10 of the outer ring 2.
  • the active part 18 extends as close to the bore 15a of the central part 15 with which it forms a radial air gap.
  • the active part 18 of the encoder 16 rotates in front of the sensor element 14 which is capable of providing an electrical signal as an output.
  • the active part 18 of the encoder 16 is a magnetized multipole ring, for example made of plastoferrite.
  • the encoder 16 and the sensor block 11 form a set for detecting rotation parameters.
  • the inside diameter of the cover 13 is substantially equal to the diameter of the cylindrical portion 17b of the support 17 of the encoder 16.
  • a narrow passage creating a seal is formed between the cover 13 on the one hand, and the active part 18 and the end of the cylindrical portion 17b of the support 17 opposite the rolling elements 6, on the other hand.
  • the cylindrical portion 17b of the support 17 extends beyond the active part 18.
  • the bearing 1 also comprises an annular sealing element 21 provided with a radial portion 21 a and an oblique portion 21b extending outward from the free end of large diameter of the radial portion 21a.
  • the internal diameter of the sealing element 21 is slightly greater than the external diameter of the cylindrical portion 17b of the support 17 of the encoder 16.
  • the sealing element 21 is disposed axially between the active part 18 of the encoder 16 and the cage 7 of the rolling elements 6 and radially between the tubular flange 12b of the support 12 of the sensor block 1 1, and the cylindrical portion 17b of said support 17.
  • the free end of the oblique portion 21b is in contact with the interior surface of the tubular flange 12b on which it exerts a support radially outwards.
  • the sealing element 21 is also in contact by a zone forming a junction between the radial portion 21a and the oblique portion 21b, with the surface 10c of the groove 10 near the bore 2b.
  • a narrow passage creating a seal is formed radially between the small diameter end of the radial portion 21a of the seal member 21 and the cylindrical portion 17b of the support 17 of the encoder 16, and axially between the radial portion 21a and the active part 18 of the encoder 16.
  • the contact between the sealing element 21 and the oblique surface 10c of the groove 10 of the outer ring 2 ensures the sealing even in the case where the rim 12b and the free end 12c of the support 12 of the sensor block 1 1 are cut into tongues to facilitate their folding towards the bottom surface 10b of the groove 10.
  • the oblique portion 21b of the sealing element 21 has a diameter in the free state greater than the inside diameter of the tubular rim 12b of the support 12. In the assembled state, illustrated in FIGS. 1 and 2, said oblique portion 21b exerts a preload directed radially outward on said rim tubular 12b, which tends to reinforce the support 12 in the groove 10 of the outer ring 2.
  • sealing element 21 once mounted is located axially at the groove 10 of the outer ring and therefore in the axial size of the bearing, which constitutes an appreciable element in terms of the compactness of the device.
  • the assembly of the sensor-encoder assembly can be carried out as follows. First of all, the support 12 is placed on the outer ring 2 and the free end 12c is folded outwards, thus ensuring its retention with the groove 10 of the outer ring 2, the free end 12c being tubular, before mounting, like the edge 12b. By an axial movement, the sealing element 21 is introduced through the opening formed by the bore of the rim 12b and the said sealing element 21 is moved in the direction of the rolling elements 6, the end of this movement causing the sliding. with clamping of the oblique portion
  • the sensor block 1 1 is provided so that the support 12 comprises an opening for mounting the sealing element 21.
  • the opening is here formed by the bore of the cylindrical part 12d and by that of the tubular rim 12b.
  • the opening is of radial dimension such that it allows the mounting of the sealing element 21, preferably by a simple axial movement.
  • the inclination of the oblique portion 21b allows an axial movement of the sealing element 21 towards the rolling elements, which allows the mounting of said element on the support 12, but prohibited by effect of bracing any movement.
  • axial of the sealing element 21 in the opposite direction which avoids any accidental disassembly of said element after its installation on the support.
  • the central part 15 is provided with an annular protuberance 15b extending axially in the direction of the rolling elements 6 and flush with the bore 15a of said central part 15.
  • the protrusion 15b is arranged radially between the active part 18 of the encoder 16 on the one hand, and the oblique portion 21b of the sealing element 21 and the tubular flange 12b of the support 12 on the other hand.
  • the protrusion 15b can be provided with an oblique outer surface in shape agreement with the oblique portion 21b of the sealing element 21.
  • the protrusion 15b serves to partially house the sensor element 14, where a reduction axial dimensions.
  • the protuberance 15b is partly arranged between the two outer 2 and inner 4 rings, and the sensor element 14 is flush with the plane of the radial front surfaces 2a and 4b of said outer 2 and inner 4 rings.
  • the variant illustrated in FIG. 3 is similar to what has been described above, except that the sealing element 22 comprises a radial disc 23 of dimension corresponding to the radial portion 21a illustrated in FIGS. 1 and 2 and disposed substantially in the same place in the bearing 1.
  • the sealing element 22 is completed by an annular bead 24, for example of rubber or of elastomer molded on the outer edge of the disc 23.
  • the outer diameter of the disc 23 is smaller to the bore of the tubular rim 12b of the support 12.
  • the bead 24 is arranged, in the assembled state, in contact on one side with the oblique surface 10c of the groove 10, and on the other side with the free end 12c in shape tapered support 12.
  • the bead 24 which is slightly compressed in the assembled state, exerts a preload on the free end 12c, this preload is essentially directed radially outward and therefore tends to reinforce the retention of said support 12 in the groove 10 of the outer ring 2.
  • the sealing element 22 is mounted by forcing it into the bore of the tubular rim 12b of the support 12, the bead 24 deploying in the groove 10 at the end of the radial mounting movement.
  • the axial size of the instrumented bearing 1 is not modified by the presence of the sealing element which is mounted at a location similar to that of a conventional bearing waterproof but not instrumented.
  • the sealing element judiciously uses the axial space anyway necessary for the attachment of the sensor block 1 in the groove 10.
  • the sealing element is simple in shape and constitutes a separate part from the sensor block the various elements of which also have relatively simple shapes.
  • the sensor block 1 1 comprises two parts 25 and 26.
  • the first part 25 is attached to the outer ring 2 and supports a light source 27.
  • the second part 26 is attached to the first part 25 and supports an optical sensor 28.
  • a space axial is provided between the light source 27 and the optical sensor 28.
  • the first part 25 made of synthetic material comprises a tubular portion 25a of which a free end is in contact with the radial surface 2a of the outer ring 2, and a radial portion 25b extending inward from the bore of the tubular portion 25a.
  • the tubular portion 25a and the radial portion 25b are annular and have substantially a T shape.
  • the source light 27 is flush with a radial surface of the radial portion 25b on the side opposite to the rolling elements 6.
  • the first part 25 also includes a hooking portion 25c extending from the small diameter end of the radial portion 25b, in direction of the rolling elements 6.
  • the attachment portion 25c is generally cylindrical in shape and is cut at its free end opposite the radial portion 25b into a plurality of elastic tabs 29.
  • Each elastic tab 29 is provided with a hook 30 s 'extending radially outwards and being in contact with the concave surface 10b of the groove 10.
  • the tongues 29 further comprise lugs 31 arranged on their inner surface and the function of which will be explained later.
  • the pins 31 have a substantially radial surface on the side of the rolling elements 6 and an oblique slope on the side opposite to the rolling elements 6.
  • the second part 26 of the sensor block 11, made of synthetic material, is of generally annular and radial shape and has an axial protuberance 32, of annular shape fitted into the bore of the tubular portion 25a of the first part 25 at its opposite end to the radial surface 2a of the outer ring 2.
  • the optical sensor 28 is flush with a radial surface 26a and is arranged opposite the light source 27.
  • the radial surface 26 is disposed near the axial protuberance 32 and is surrounded by the latter .
  • the second part 26 also has an axial annular groove 26b adjacent to the radial surface 26a and of smaller diameter.
  • the encoder 16 comprises a support 33 and an active part 34 formed in a single piece and made of metal.
  • the support 33 comprises a radial portion 33a in contact with the radial surface 4b of the inner ring 4 on its inner edge, and an axial protuberance 33b extending axially in the direction of the rolling elements 6 from the radial portion 33a and fitted on the range 4c of the inner ring 4.
  • the support 33 of the encoder 16 further comprises a tubular portion 33c extending axially opposite the rolling elements 6 from the free end of large diameter of the radial portion 33a.
  • the tubular portion 33c is of smaller diameter than the bore of the attachment portion 25c of the first part 25 of the sensor block 1 1 and protrudes by its free end in the groove 26b of the second part 26 of the block sensor 1 1 with which it forms a narrow passage ensuring sealing.
  • the active part 34 of the encoder 16 is of radial shape extending outward from the outer surface of the tubular portion 33c of the support 33 and is arranged in the axial space existing between the light source 27 and the optical sensor 28.
  • the active part 34 has a diameter less than the bore of the protuberance 32 which surrounds it.
  • the active part 34 is cut into a plurality of slots 35 circumferentially regularly spaced so that a light beam emitted by the source 27 periodically crosses the slots 35 of the active part 34, the periodicity being linked to the relative speed of rotation against the encoder 16 and sensor block 11.
  • the instrumented bearing 1 also comprises a sealing element 36 comprising a radial annular disc 37 of metal and a flexible coating 38 secured to the disc 37 and disposed on the radial surface of said disc 37 on the side of the rolling elements 6 and in close proximity to its outer edge.
  • the sealing element 36 is disposed axially between the cage 7 and the radial portion 33a of the support 33 of the encoder 16 and axially between the fitting protrusion 33b of said support 33 and the attachment portion 25c of the first part 25 of the sensor block H.
  • the coating 38 of the sealing element 36 is in contact with the oblique surface 10c of the groove 10.
  • the exterior surface of the annular disc 37 is in contact with the interior surface of the hooks 30 and is retained by the pins. 31 against any axial disassembly movement going in a direction opposite to the rolling elements 6.
  • the assembly of the encoder-sensor assembly is carried out in the same order as for the embodiment of FIGS. 1 to 3.
  • the first part 25 is first fixed by placing the hooks 30 in the groove 10.
  • the sealing element 36 is forced axially which slides along the inner surface of the hooking portion 25c, crosses the pins 31 and finds its final position axially between the pins 31 and the oblique surface 10c of the groove 10 In this position, the hooks 30 are held in the groove 10 from which they can no longer come out.
  • the encoder 16 is then connected to the bearing 4c of the inner ring 4 until the radial portion 33a of the support 33 comes into contact with the radial surface 4b of the inner ring 4.
  • the second part 26 of the sensor block 1 1 is fitted into the bore of the tubular portion 25a of the first part 25, the final connection of the two parts 25 and 26 of the sensor unit can be done by ultrasonic welding for example.
  • the static seal between the sealing element 36 and the outer ring 2 is ensured by the flexible coating 38 made of elastomer or equivalent.
  • the dynamic seal between the sealing element 36 and the rotating part is ensured by the narrow passage formed between the radial disc 37 and, on the one hand, the fitting protrusion 33b and, on the other hand, the portion radial 33a of the support 33.
  • the static seal between the support 33 and the inner ring 4 is ensured by the fitting of the protuberance 33b on the bearing 4c.
  • the dynamic seal between the encoder 16 and the sensor block 1 1 is ensured by the narrow passage produced by the free end of the cylindrical portion 33c of the support 33 projecting into the groove 26b of the first part 26 of the sensor block 1 1 .
  • the radial tightening of the disc 37 of the sealing element 36 in the ring of fixing hooks 30 has the effect of reinforcing the radial tightening of the hooks 30 in the groove 10 and therefore the retention of the sensor block 1 1 in the outer ring 2.
  • the small lugs 31 projecting inwards prevent any disassembly of the sealing element 36 after its installation.
  • the sealing element 36 is fixed in the axial region of the groove 10 and does not in any way increase the axial size of the instrumented bearing 1.
  • the sealing element 39 comprises a rigid part 40 made of sheet metal, a sealing lip 41 molded onto the inner edge of the rigid part 40 and rubbing against the external surface of the protrusion 33b of the support 33 of the encoder 16, thus ensuring excellent dynamic sealing, and a flexible coating 42 molded onto the rigid part 40 and in contact with the oblique surface 10c of the groove 10.
  • the coating 42 and the sealing lip 41 can be made of elastomer, rubber or any other equivalent material ensuring a static seal in a dynamic case in the other.
  • the rigid part 40 which is generally radial in shape, is provided on its outer edge with an oblique end 40a in contact with the inner surface 30a of the ring of hooks 30. Said inner surface 30a is in shape agreement with said end oblique
  • the dynamic end 40a is also in contact with the pins 31 preventing disassembly.
  • the free end 40a is formed so that its slope relative to the axis of the bearing 1 tends to prevent disassembly of the first part 25 of the sensor block 1 1.
  • the free end 40a snaps beyond the lugs 31 and is particularly effective against a disassembly movement.
  • a compact instrumented rolling bearing is produced, which is particularly well protected and of economical manufacture thanks to the use of standard elements, both for the outer ring and for the inner ring of the bearing.
  • the various elements of the encoder-sensor assembly are assembled by simple axial movements, for example produced by means of a press, which is inexpensive.

Abstract

The invention concerns an instrumented antifriction bearing device provided with a non-rotating part comprising a non-rotating ring (2) and sensing means (11), a rotating part comprising a rotating ring (4) and coding means (16), and at least a row of rolling elements (6) arranged between the two raceways (3, 5) of the non-rotating (2) and the rotating (4) rings, the sensing means (11) being fixed in a groove (10) of said non-rotating ring (2) arranged proximate to a radial lateral surface (2a) of the non-rotating ring (2). The non-rotating part further comprises sealing means (21) arranged axially between the sensing means (11) and the rolling elements (6) substantially at the groove (10), the sealing means (21) being separate from the sensing means (11).

Description

Palier à roulement instrumenté muni d'un dispositif d'étanchéité. Instrumented rolling bearing fitted with a sealing device.
La présente invention concerne le domaine des paliers à roulement instrumentés munis d'un ensemble de détection des paramètres de rotation tel que la rotation angulaire, le sens de rotation, la vitesse, et/ou l'accélération. De manière connue, par exemple par le document EP-A-0 327The present invention relates to the field of instrumented rolling bearings fitted with a set for detecting rotation parameters such as angular rotation, direction of rotation, speed, and / or acceleration. In a known manner, for example by document EP-A-0 327
434, un roulement instrumenté comporte généralement un ensemble de détection constitué d'un capteur solidaire de la bague non tournante du roulement et d'un codeur solidaire de la bague tournante du roulement. Le codeur défile à rotation devant le capteur de façon que le capteur génère un signal représentatif des paramètres de rotation du codeur, par exemple un signal électrique sinusoïdal ou carré dont la fréquence est proportionnelle à la vitesse de rotation du codeur. Le codeur peut être de type magnétique multipolaire ou optique et fonctionne en coopération avec un capteur de type correspondant, c'est-à-dire magnétosensible pour un codeur magnétique et optique pour un codeur optique. Le capteur et le codeur sont disposés d'un côté du roulement, chacun étant fixé sur la bague correspondante par l'intermédiaire d'un support. Chacun des supports est fixé par emmanchement sur une portée cylindrique de la bague correspondante, usinée à cet effet. Pour éviter l'intrusion de pollutions extérieures susceptibles de dégrader le fonctionnement de l'ensemble de détection ainsi que le fonctionnement du roulement, des étanchéités sont prévues de chaque côté dudit roulement. Du côté opposé à l'ensemble de détection, un joint formé d'un flasque métallique sur lequel est surmoulée une portion souple est fixé dans une gorge annulaire de la bague extérieure. Une lèvre issue de la portion souple vient frotter sur une portée de frottement de la bague intérieure. Du côté de l'ensemble de détection, un joint d'étanchéité également composé d'un flasque métallique et d'une portion souple est fixé sur un alésage du support de capteur. Une lèvre issue de la portion souple vient frotter sur une portée de frottement du support du moyen codeur.434, an instrumented bearing generally comprises a detection assembly consisting of a sensor secured to the non-rotating ring of the bearing and an encoder secured to the rotating ring of the bearing. The encoder rotates in front of the sensor so that the sensor generates a signal representative of the parameters of rotation of the encoder, for example a sinusoidal or square electrical signal whose frequency is proportional to the speed of rotation of the encoder. The encoder can be of the multipolar or optical magnetic type and operates in cooperation with a sensor of the corresponding type, that is to say magnetosensitive for a magnetic encoder and optical for an optical encoder. The sensor and the encoder are arranged on one side of the bearing, each being fixed to the corresponding ring by means of a support. Each of the supports is fixed by fitting onto a cylindrical surface of the corresponding ring, machined for this purpose. To avoid the intrusion of external pollution liable to degrade the functioning of the detection assembly as well as the functioning of the bearing, seals are provided on each side of said bearing. On the side opposite the detection assembly, a seal formed by a metal flange on which a flexible portion is overmolded is fixed in an annular groove of the outer ring. A lip from the flexible portion rubs against a friction surface of the inner ring. On the side of the detection assembly, a seal also composed of a metal flange and a flexible portion is fixed to a bore of the sensor support. A lip from the flexible portion rubs against a friction surface of the support of the encoder means.
Les usinages spécifiques nécessaires à la fixation du codeur et du capteur montés sur leurs supports sont coûteux et relativement encombrants. En outre, dans le cas d'un ensemble de détection de type optique, il convient d'éviter l'entrée du lubrifiant du roulement entre le codeur et le capteur.The specific machining operations necessary for fixing the encoder and the sensor mounted on their supports are expensive and relatively bulky. In addition, in the case of an optical type detection assembly, the entry of bearing lubricant between the encoder and the sensor should be avoided.
La présente invention a pour objet de remédier aux inconvénients des dispositifs de l'art antérieur. La présente invention a pour objet de proposer un palier à roulement instrumenté dont les bagues sont de type standard prévu pour être utilisé aussi bien avec ou sans ensemble de détection, et comportant une étanchéité entre les éléments roulants et l'entrefer situé entre le capteur et le codeur. Le dispositif de palier à roulement instrumenté, selon l'invention, est du type pourvu d'une partie non tournante comprenant une bague non tournante et un moyen capteur, d'une partie tournante comprenant une bague tournante et un moyen codeur, et d'au moins une rangée d'éléments roulants disposés entre deux chemins de roulement des bagues non tournante et tournante, le moyen capteur étant fixé dans une rainure de la bague non tournante disposée à proximité d'une face latérale radiale de ladite bague non tournante. La partie non tournante comprend, en outre, un moyen d'étanchéité disposé axialement entre le moyen capteur et les éléments roulants sensiblement au niveau de la rainure, le moyen d'étanchéité étant distinct du moyen capteur.The object of the present invention is to remedy the drawbacks of the devices of the prior art. The object of the present invention is to provide an instrumented rolling bearing whose rings are of the standard type intended to be used both with or without a detection assembly, and comprising a seal between the rolling elements and the air gap situated between the sensor and the encoder. The instrumented rolling bearing device according to the invention is of the type provided with a non-rotating part comprising a non-rotating ring and a sensor means, a rotating part comprising a rotating ring and an encoder means, and at least one row of rolling elements arranged between two raceways of the non-rotating and rotating rings, the sensor means being fixed in a groove of the non-rotating ring arranged near a radial lateral face of said non-rotating ring. The non-rotating part further comprises a sealing means disposed axially between the sensor means and the rolling elements substantially at the level of the groove, the sealing means being distinct from the sensor means.
Une étanchéité est ainsi assurée entre le moyen capteur et les éléments roulants. Le moyen capteur peut être fixé dans une rainure standard apte à recevoir dans d'autres utilisations un joint d'étanchéité. Le moyen codeur peut être fixé sur une portée standard de la bague tournante apte à coopérer dans d'autres utilisations avec un joint d'étanchéité. On peut utiliser ainsi des bagues standards, peu coûteuses, fabriquées et utilisées en grandes séries pour des roulements étanches de la série dite "ISO", dépourvus de moyens de mesure des paramètres de rotation. L'entrefer entre le codeur et le capteur est isolé efficacement du lubrifiant disposé dans le roulement.A seal is thus ensured between the sensor means and the rolling elements. The sensor means can be fixed in a standard groove suitable for receiving in other uses a seal. The encoder means can be fixed on a standard surface of the rotating ring able to cooperate in other uses with a seal. We can thus use standard rings, inexpensive, manufactured and used in large series for sealed bearings of the so-called "ISO" series, devoid of means for measuring the rotation parameters. The air gap between the encoder and the sensor is effectively isolated from the lubricant placed in the bearing.
On obtient ainsi de façon très économique un roulement à capteur d'informations à partir d'éléments d'un roulement de base conventionnel pouvant être choisis dans la gamme dite "ISO" des constructeurs de roulement. Avantageusement, la bague non tournante comprend deux rainures disposées d'un côté et de l'autre des éléments roulants. Le profil des deux rainures peut être identique. La bague non tournante peut être symétrique par rapport à un plan passant par le centre des éléments roulants. Avantageusement, le moyen capteur comprend un support dont une partie est disposée dans ladite rainure de la bague non tournante pour la fixation dudit moyen capteur sur ladite bague non tournante. La partie disposée dans ladite rainure peut être de diamètre supérieur à celui du reste du support. Le support de capteur est ici monté à la place d'un joint de roulement conventionnel.A bearing with an information sensor is thus obtained very economically from elements of a conventional basic bearing which can be chosen from the so-called "ISO" range of bearing manufacturers. Advantageously, the non-rotating ring comprises two grooves arranged on one side and on the other of the rolling elements. The profile of the two grooves can be identical. The non-rotating ring can be symmetrical with respect to a plane passing through the center of the rolling elements. Advantageously, the sensor means comprises a support, part of which is disposed in said groove of the non-rotating ring for fixing said sensor means on said non-rotating ring. The part disposed in said groove may be of diameter greater than that of the rest of the support. The sensor support is here mounted in place of a conventional bearing seal.
Dans un mode de réalisation de l'invention, le moyen d'étanchéité est disposé radialement entre un support du moyen capteur et la bague tournante.In one embodiment of the invention, the sealing means is arranged radially between a support of the sensor means and the rotating ring.
Avantageusement, le moyen d'étanchéité comprend une portion sensiblement radiale de forme annulaire et une portion d'accrochage en contact avec le moyen capteur. La portion d'accrochage peut coopérer avec le support du moyen capteur. La portion d'accrochage peut être montée avec un serrage radial sur le moyen capteur.Advantageously, the sealing means comprises a substantially radial portion of annular shape and a hooking portion in contact with the sensor means. The attachment portion can cooperate with the support of the sensor means. The attachment portion can be mounted with a radial clamping on the sensor means.
Dans un mode de réalisation de l'invention, la portion d'accrochage du moyen d'étanchéité est également en contact avec la bague non tournante.In one embodiment of the invention, the attachment portion of the sealing means is also in contact with the non-rotating ring.
Dans un mode de réalisation de l'invention, la portion d'accrochage du moyen d'étanchéité comprend un bourrelet en matériau souple. Le bourrelet peut être en saillie dans ladite rainure et en contact à la fois avec le support du moyen capteur et la bague non tournante. Le bourrelet peut contribuer au maintien en place du support du moyen capteur.In one embodiment of the invention, the attachment portion of the sealing means comprises a bead of flexible material. The bead can be projecting in said groove and in contact with both the support of the sensor means and the non-rotating ring. The bead can contribute to maintaining the support of the sensor means in place.
Dans un autre mode de réalisation de l'invention, la portion d'accrochage du moyen d'étanchéité comprend un rebord oblique issu de la portion sensiblement radiale.In another embodiment of the invention, the attachment portion of the sealing means comprises an oblique flange issuing from the substantially radial portion.
Avantageusement, le moyen capteur comprend une ouverture de montage du moyen d'étanchéité, située à l'opposé des éléments roulants et permettant l'introduction dudit moyen d'étanchéité dans le moyen capteur en direction des éléments roulants. La présente invention a également pour objet un procédé de montage d'un palier à roulement instrumenté. Le palier est du type pourvu d'une partie non tournante comprenant une bague non tournante et un moyen capteur, d'une partie tournante comprenant une bague tournante et un moyen codeur, et d'au moins une rangée d'éléments roulants disposés entre deux chemins de roulement des bagues non tournante et tournante, dans lequel on dispose un moyen d'étanchéité axialement entre le moyen capteur et les éléments roulants, le moyen d'étanchéité étant distinct du moyen capteur, le moyen capteur étant fixé dans une rainure de la bague non tournante disposée à proximité d'une face latérale radiale de ladite bague non tournante, le moyen d'étanchéité étant disposé sensiblement au niveau de la rainure.Advantageously, the sensor means comprises an opening for mounting the sealing means, situated opposite the rolling elements and allowing the introduction of said sealing means into the sensor means in the direction of the rolling elements. The present invention also relates to a method of mounting an instrumented rolling bearing. The bearing is of the type provided with a non-rotating part comprising a non-rotating ring and a sensor means, a rotating part comprising a rotating ring and an encoder means, and at least one row of rolling elements arranged between two raceways of the non-rotating and rotating rings, in which there is a sealing means axially between the sensor means and the rolling elements, the sealing means being distinct from the sensor means, the sensor means being fixed in a groove of the non-rotating ring disposed near a radial lateral face of said non-rotating ring, the sealing means being disposed substantially at the level of the groove.
Le moyen d'étanchéité peut venir serrer radialement sur le moyen capteur. On peut monter le moyen d'étanchéité par une ouverture du moyen capteur située à l'opposé des éléments roulants. On peut monter le support du moyen capteur, puis le moyen d'étanchéité, puis le reste du moyen capteur, ledit support laissant une ouverture de passage du moyen d'étanchéité. Ces étapes de montage mettent en oeuvre des mouvements simples pouvant être effectués économiquement au moyen d'une presse. La présente invention sera mieux comprise à l'étude de la description détaillée de quelques modes de réalisation pris à titre d'exemples nullement limitatifs et illustrés par les dessins annexés, sur lesquels :The sealing means can come to tighten radially on the sensor means. The sealing means can be mounted by an opening of the sensor means situated opposite the rolling elements. The support of the sensor means can be mounted, then the sealing means, then the rest of the sensor means, said support leaving an opening for passage of the sealing means. These assembly steps implement simple movements which can be carried out economically by means of a press. The present invention will be better understood on studying the detailed description of some embodiments taken by way of non-limiting examples and illustrated by the appended drawings, in which:
- la figure 1 est une vue en coupe axiale d'un palier à roulement selon un premier mode de réalisation de l'invention; - la figure 2 est une vue partielle agrandie du palier à roulement de la figure 1 ;- Figure 1 is an axial sectional view of a rolling bearing according to a first embodiment of the invention; - Figure 2 is an enlarged partial view of the rolling bearing of Figure 1;
- la figure 3 est une variante de la figure 2;- Figure 3 is a variant of Figure 2;
- la figure 4 est une vue en coupe axiale d'un palier à roulement selon un deuxième mode de réalisation de l'invention;- Figure 4 is an axial sectional view of a rolling bearing according to a second embodiment of the invention;
- la figure 5 est une vue partielle agrandie du palier à roulement de la figure 4; et- Figure 5 is an enlarged partial view of the rolling bearing of Figure 4; and
- la figure 6 est une variante de la figure 5.- Figure 6 is a variant of Figure 5.
Comme on peut le voir sur les figures 1 et 2, un roulement 1 comprend une bague extérieure 2 pourvue d'un chemin de roulement 3 , une bague intérieure 4 pourvue d'un chemin de roulement 5, une rangée d'éléments roulants 6, ici des billes, disposés entre les chemins de roulement 3 et 5, une cage 7 de maintien de l'espacement circonférentiel des éléments roulants 6 et un joint d'étanchéité 8 monté sur la bague extérieure 2 et venant en frottement avec une portée cylindrique 4a de la bague intérieure 4 tout en étant disposé radialement entre lesdites deux bagues 2 et 4 et axialement entre la rangée d'éléments roulants 6 et l'une des surfaces latérales desdites bagues 2, 4. Le joint d'étanchéité 8 est monté dans une rainure annulaire 9 formée dans la bague extérieure 2 à proximité de sa surface latérale radiale 2a. Du côté opposé, la bague extérieure 2 est également pourvue d'une rainure 10 symétrique à la rainure 9 par rapport à un plan passant par le centre des éléments roulants 6.As can be seen in FIGS. 1 and 2, a bearing 1 comprises an outer ring 2 provided with a raceway 3, an inner ring 4 provided with a raceway 5, a row of rolling elements 6, here balls, arranged between the raceways 3 and 5, a cage 7 for maintaining the circumferential spacing of the rolling elements 6 and a seal 8 mounted on the outer ring 2 and coming into friction with a cylindrical surface 4a of the inner ring 4 while being disposed radially between said two rings 2 and 4 and axially between the row of rolling elements 6 and one of the lateral surfaces of said rings 2, 4. The seal 8 is mounted in a annular groove 9 formed in the outer ring 2 near its radial lateral surface 2a. On the opposite side, the outer ring 2 is also provided with a groove 10 symmetrical with the groove 9 with respect to a plane passing through the center of the rolling elements 6.
La rainure 10 comprend une surface sensiblement cylindrique 10a adjacente à la surface latérale radiale 2a, une surface concave 10b formant le fond de ladite rainure 10, et une surface oblique 10c située du côté des éléments roulants 6 et se raccordant à l'alésage 2b de la bague extérieure 2.The groove 10 comprises a substantially cylindrical surface 10a adjacent to the radial lateral surface 2a, a concave surface 10b forming the bottom of said groove 10, and an oblique surface 10c situated on the side of the rolling elements 6 and connecting to the bore 2b of the outer ring 2.
Un bloc capteur référencé 11 dans son ensemble est monté sur la bague extérieure 2 du côté de la rainure 10. Le bloc capteur 1 1 comprend un support métallique 12, un capot métallique 13, et un élément capteur 14 noyé dans une partie centrale en matériau synthétique 15.A sensor block referenced 11 as a whole is mounted on the outer ring 2 on the side of the groove 10. The sensor block 1 1 comprises a metal support 12, a metal cover 13, and a sensor element 14 embedded in a central part made of material synthetic 15.
Le support métallique 12, de forme générale annulaire, comprend une paroi radiale 12a en contact avec une surface frontale radiale 2a de la bague extérieure 2 du côté de la rainure 10 et se prolongeant sur son bord interne par un rebord sensiblement tubulaire 12b en contact avec la surface 10a de la rainure 10 et dont l'extrémité libre 12c est repliée radialement vers l'extérieur dans la rainure 10 et assure l'accrochage du support 12 sur la bague extérieure 2. L'extrémité libre 12c présente une forme tronconique. Le support métallique 12 comprend également une partie cylindrique 12d s'étendant à partir du bord externe de la partie radiale 12a axialement à l'opposé du roulement 1 et se terminant par un rebord 12e légèrement plié à l'oblique à l'intérieur. La partie cylindrique 12d est pourvue d'une échancrure 12f. Le capot métallique 13 présente une forme générale de disque avec une extrémité de grand diamètre 13a légèrement pliée vers la bague extérieure 2 et coopérant avec le rebord 12e de la partie cylindrique 12d, ledit rebord 12e assurant le maintien du capot 13 en serrant autour de l'extrémité 13 a. La partie centrale 15 est, en dehors de la zone de l'échancrureThe metal support 12, of generally annular shape, comprises a radial wall 12a in contact with a radial front surface 2a of the outer ring 2 on the side of the groove 10 and is extending on its internal edge by a substantially tubular rim 12b in contact with the surface 10a of the groove 10 and whose free end 12c is folded radially outward in the groove 10 and ensures the attachment of the support 12 on the ring exterior 2. The free end 12c has a frustoconical shape. The metal support 12 also comprises a cylindrical part 12d extending from the outer edge of the radial part 12a axially opposite the bearing 1 and ending in a flange 12e slightly bent obliquely inside. The cylindrical part 12d is provided with a notch 12f. The metal cover 13 has a general disc shape with a large diameter end 13a slightly bent towards the outer ring 2 and cooperating with the rim 12e of the cylindrical part 12d, said rim 12e ensuring the maintenance of the cover 13 by tightening around the end 13 a. The central part 15 is, outside the area of the notch
12e, limitée radialement par la partie cylindrique 12d du support 12 vers l'extérieur et présente un alésage 15a de diamètre tel qu'il subsiste un espace radial suffisant pour le codeur qui sera décrit plus loin. L'élément capteur 14 qui est solidaire de la partie centrale 15 affleure l'alésage 15a. Une extrémité de la partie centrale 15 en saillie radiale vers l'extérieur forme un terminal 19 de sortie de fil 20. Ledit terminal 19 passe par l'échancrure 12e de la partie cylindrique 12d.12e, bounded radially by the cylindrical part 12d of the support 12 outwards and has a bore 15a of diameter such that there remains sufficient radial space for the encoder which will be described later. The sensor element 14 which is integral with the central part 15 is flush with the bore 15a. One end of the central part 15 projecting radially outwards forms a wire outlet terminal 19 20. Said terminal 19 passes through the notch 12e of the cylindrical part 12d.
Un codeur 16 comprend un support 17 annulaire et une partie active 18. Le support 17 est de forme annulaire à section en T et comprend une portion radiale 17a axialement en contact avec une surface frontale radiale 4b de la bague intérieure 4 du même côté que le bloc capteur 1 1 et une portion cylindrique 17b s'étendant à partir du bord extérieur de la portion radiale 17a axialement des deux côtés en étant emmanchée du côté de la bague intérieure 4 sur une portée cylindrique 4c de ladite bague intérieure 4. La portée 4c est, de préférence, symétrique de la portée 4a par rapport à un plan radial passant par le centre des éléments roulants 6.An encoder 16 comprises an annular support 17 and an active part 18. The support 17 is of annular shape with T section and includes a radial portion 17a axially in contact with a radial front surface 4b of the inner ring 4 on the same side as the sensor block 1 1 and a cylindrical portion 17b extending from the outer edge of the radial portion 17a axially on both sides while being fitted on the side of the inner ring 4 on a cylindrical bearing surface 4c of said inner ring 4. The bearing surface 4c is preferably symmetrical with the bearing 4a with respect to a radial plane passing through the center of the rolling elements 6.
La partie active 18 du codeur 16 est de forme annulaire de section généralement rectangulaire disposée sur le pourtour extérieur de la portion cylindrique 17b. La partie active 18 s'étend axialement en direction des éléments roulants 6 au-delà de la portion radiale 17a entre les bagues extérieure 2 et intérieure 4, sensiblement jusqu'au niveau de la rainure 10 de la bague extérieure 2.The active part 18 of the encoder 16 is of annular shape of generally rectangular section arranged on the outer periphery of the cylindrical portion 17b. The active part 18 extends axially in the direction of the rolling elements 6 beyond the radial portion 17a between the outer 2 and inner 4 rings, substantially up to the level of the groove 10 of the outer ring 2.
La partie active 18 s'étend jusqu'à proximité de l'alésage 15a de la partie centrale 15 avec lequel elle forme un entrefer radial. Lors de la rotation de la bague intérieure 4 par rapport à la bague extérieure 2, la partie active 18 du codeur 16 défile à rotation devant l'élément capteur 14 qui est capable de fournir en sortie un signal électrique. En effet, la partie active 18 du codeur 16 est une bague magnétisée multipolaire, par exemple en plastoferrite. Le codeur 16 et le bloc capteur 11 forment un ensemble de détection de paramètres de rotation.The active part 18 extends as close to the bore 15a of the central part 15 with which it forms a radial air gap. During the rotation of the inner ring 4 relative to the outer ring 2, the active part 18 of the encoder 16 rotates in front of the sensor element 14 which is capable of providing an electrical signal as an output. In fact, the active part 18 of the encoder 16 is a magnetized multipole ring, for example made of plastoferrite. The encoder 16 and the sensor block 11 form a set for detecting rotation parameters.
Le diamètre intérieur du capot 13 est sensiblement égal au diamètre de la portion cylindrique 17b du support 17 du codeur 16. Un passage étroit créant une étanchéité est formé entre le capot 13 d'une part, et la partie active 18 et l'extrémité de la portion cylindrique 17b du support 17 opposée aux éléments roulants 6, d'autre part. Du côté des éléments roulants 6, la portion cylindrique 17b du support 17 s'étend au-delà de la partie active 18.The inside diameter of the cover 13 is substantially equal to the diameter of the cylindrical portion 17b of the support 17 of the encoder 16. A narrow passage creating a seal is formed between the cover 13 on the one hand, and the active part 18 and the end of the cylindrical portion 17b of the support 17 opposite the rolling elements 6, on the other hand. On the side of the rolling elements 6, the cylindrical portion 17b of the support 17 extends beyond the active part 18.
Le roulement 1 comprend encore un élément d'étanchéité 21 de forme annulaire pourvu d'une portion radiale 21 a et d'une portion oblique 21b s'étendant vers l'extérieur à partir de l'extrémité libre de grand diamètre de la portion radiale 21a. Le diamètre intérieur de l'élément d'étanchéité 21 est légèrement supérieur au diamètre extérieur de la portion cylindrique 17b du support 17 du codeur 16. L'élément d'étanchéité 21 est disposé axialement entre la partie active 18 du codeur 16 et la cage 7 des éléments roulants 6 et radialement entre le rebord tubulaire 12b du support 12 du bloc capteur 1 1 , et la portion cylindrique 17b dudit support 17. L'extrémité libre de la portion oblique 21b est en contact avec la surface intérieure du rebord tubulaire 12b sur laquelle elle exerce un appui radialement vers l'extérieur. L'élément d'étanchéité 21 est également en contact par une zone formant jonction entre la portion radiale 21 a et la portion oblique 21b, avec la surface 10c de la rainure 10 à proximité de l'alésage 2b.The bearing 1 also comprises an annular sealing element 21 provided with a radial portion 21 a and an oblique portion 21b extending outward from the free end of large diameter of the radial portion 21a. The internal diameter of the sealing element 21 is slightly greater than the external diameter of the cylindrical portion 17b of the support 17 of the encoder 16. The sealing element 21 is disposed axially between the active part 18 of the encoder 16 and the cage 7 of the rolling elements 6 and radially between the tubular flange 12b of the support 12 of the sensor block 1 1, and the cylindrical portion 17b of said support 17. The free end of the oblique portion 21b is in contact with the interior surface of the tubular flange 12b on which it exerts a support radially outwards. The sealing element 21 is also in contact by a zone forming a junction between the radial portion 21a and the oblique portion 21b, with the surface 10c of the groove 10 near the bore 2b.
Ainsi, un passage étroit créant une étanchéité est formé radialement entre l'extrémité de petit diamètre de la portion radiale 21a de l'élément d'étanchéité 21 et la portion cylindrique 17b du support 17 du codeur 16, et axialement entre la portion radiale 21a et la partie active 18 du codeur 16. Le contact entre l'élément d'étanchéité 21 et la surface oblique 10c de la rainure 10 de la bague extérieure 2 assure l'étanchéité même dans le cas où le rebord 12b et l'extrémité libre 12c du support 12 du bloc capteur 1 1 sont découpés en languettes pour faciliter leur repliement vers la surface 10b de fond de la rainure 10. La portion oblique 21b de l'élément d'étanchéité 21 possède un diamètre à l'état libre supérieur au diamètre intérieur du rebord tubulaire 12b du support 12. A l'état monté, illustré sur les figures 1 et 2, ladite portion oblique 21b exerce une précontrainte dirigée radialement vers l'extérieur sur ledit rebord tubulaire 12b, ce qui tend à renforcer le maintien du support 12 dans la rainure 10 de la bague extérieure 2.Thus, a narrow passage creating a seal is formed radially between the small diameter end of the radial portion 21a of the seal member 21 and the cylindrical portion 17b of the support 17 of the encoder 16, and axially between the radial portion 21a and the active part 18 of the encoder 16. The contact between the sealing element 21 and the oblique surface 10c of the groove 10 of the outer ring 2 ensures the sealing even in the case where the rim 12b and the free end 12c of the support 12 of the sensor block 1 1 are cut into tongues to facilitate their folding towards the bottom surface 10b of the groove 10. The oblique portion 21b of the sealing element 21 has a diameter in the free state greater than the inside diameter of the tubular rim 12b of the support 12. In the assembled state, illustrated in FIGS. 1 and 2, said oblique portion 21b exerts a preload directed radially outward on said rim tubular 12b, which tends to reinforce the support 12 in the groove 10 of the outer ring 2.
On remarque que l'élément d'étanchéité 21 une fois monté se trouve situé axialement au niveau de la rainure 10 de la bague extérieure et donc dans l'encombrement axial du roulement, ce qui constitue un élément appréciable sur le plan de la compacité du dispositif.Note that the sealing element 21 once mounted is located axially at the groove 10 of the outer ring and therefore in the axial size of the bearing, which constitutes an appreciable element in terms of the compactness of the device.
Le montage de l'ensemble capteur-codeur peut s'effectuer de la façon suivante. On dispose tout d'abord le support 12 sur la bague extérieure 2 et on replie l'extrémité libre 12c vers l'extérieur, assurant ainsi sa retenue avec la rainure 10 de la bague extérieure 2, l'extrémité libre 12c étant tubulaire, avant montage, à l'instar du rebord 12b. Par un mouvement axial, on introduit l'élément d'étanchéité 21 par l'ouverture constituée par l'alésage du rebord 12b et on déplace ledit élément d'étanchéité 21 en direction des éléments roulants 6, la fin de ce mouvement provoquant le glissement avec serrage de la portion obliqueThe assembly of the sensor-encoder assembly can be carried out as follows. First of all, the support 12 is placed on the outer ring 2 and the free end 12c is folded outwards, thus ensuring its retention with the groove 10 of the outer ring 2, the free end 12c being tubular, before mounting, like the edge 12b. By an axial movement, the sealing element 21 is introduced through the opening formed by the bore of the rim 12b and the said sealing element 21 is moved in the direction of the rolling elements 6, the end of this movement causing the sliding. with clamping of the oblique portion
21b sur l'alésage du rebord tubulaire 12b. Le mouvement est arrêté par le contact entre l'élément d'étanchéité 21 et la surface oblique 10c de la rainure 10 à proximité immédiate de l'alésage 2b de la bague extérieure 2. On amène ensuite par un mouvement radial le codeur 16 et on emmanche son support 17 sur la portée 4c de la bague intérieure 4. Enfin, on dispose la partie centrale 15 incorporant l'élément capteur 14 dans la partie cylindrique 12d du support 12, puis on amène le capot 13 et on replie vers l'intérieur le rebord d'extrémité 12e de la partie cylindrique 12d qui assure la retenue du capot 13 et par voie de conséquence de la partie centrale 15. En d'autres termes, le bloc-capteur 1 1 est prévu de façon que le support 12 comprenne une ouverture de montage de l'élément d'étanchéité 21. L'ouverture est, ici, formée par l'alésage de la partie cylindrique l2d et par celui du rebord tubulaire 12b. L'ouverture est de dimension radiale telle qu'elle permette le montage de l'élément d'étanchéité 21 , de préférence par un mouvement axial simple.21b on the bore of the tubular rim 12b. The movement is stopped by the contact between the sealing element 21 and the oblique surface 10c of the groove 10 in the immediate vicinity of the bore 2b of the outer ring 2. The encoder 16 is then brought in by radial movement and connects its support 17 to the bearing 4c of the inner ring 4. Finally, we have the central part 15 incorporating the sensor element 14 in the cylindrical part 12d of the support 12, then we bring the cover 13 and fold inwards the end rim 12e of the cylindrical part 12d which ensures the retention of the cover 13 and consequently of the central part 15. In other words, the sensor block 1 1 is provided so that the support 12 comprises an opening for mounting the sealing element 21. The opening is here formed by the bore of the cylindrical part 12d and by that of the tubular rim 12b. The opening is of radial dimension such that it allows the mounting of the sealing element 21, preferably by a simple axial movement.
En outre, l'inclinaison de la portion oblique 21b autorise un mouvement axial de l'élément d'étanchéité 21 vers les éléments roulants, ce qui permet le montage dudit élément sur le support 12, mais interdit par effet d'avec boutement tout mouvement axial de l'élément d'étanchéité 21 en sens inverse, ce qui évite tout démontage accidentel dudit élément après sa mise en place sur le support.In addition, the inclination of the oblique portion 21b allows an axial movement of the sealing element 21 towards the rolling elements, which allows the mounting of said element on the support 12, but prohibited by effect of bracing any movement. axial of the sealing element 21 in the opposite direction, which avoids any accidental disassembly of said element after its installation on the support.
Pour réduire l'encombrement axial du roulement instrumenté 1 dans son ensemble, la partie centrale 15 est pourvue d'une protubérance annulaire 15b s'étendant axialement en direction des éléments roulants 6 et affleurant l'alésage 15a de ladite partie centrale 15. La protubéranceTo reduce the axial size of the instrumented bearing 1 as a whole, the central part 15 is provided with an annular protuberance 15b extending axially in the direction of the rolling elements 6 and flush with the bore 15a of said central part 15. The protuberance
15b est disposée radialement entre la partie active 18 du codeur 16 d'une part, et la portion oblique 21b de l'élément d'étanchéité 21 et le rebord tubulaire 12b du support 12 d'autre part. La protubérance 15b peut être pourvue d'une surface extérieure oblique en concordance de forme avec la portion oblique 21 b de l'élément d'étanchéité 21. La protubérance 15b sert à loger en partie l'élément capteur 14, d'où une réduction de l'encombrement axial. En d'autres termes, la protubérance 15b est disposée en partie entre les deux bagues extérieure 2 et intérieure 4, et l'élément capteur 14 affleure le plan des surfaces frontales radiales 2a et 4b desdites bagues extérieure 2 et intérieure 4.15b is arranged radially between the active part 18 of the encoder 16 on the one hand, and the oblique portion 21b of the sealing element 21 and the tubular flange 12b of the support 12 on the other hand. The protrusion 15b can be provided with an oblique outer surface in shape agreement with the oblique portion 21b of the sealing element 21. The protrusion 15b serves to partially house the sensor element 14, where a reduction axial dimensions. In other words, the protuberance 15b is partly arranged between the two outer 2 and inner 4 rings, and the sensor element 14 is flush with the plane of the radial front surfaces 2a and 4b of said outer 2 and inner 4 rings.
La variante illustrée sur la figure 3 est semblable à ce qui a été décrit ci-dessus, à ceci près que l'élément d'étanchéité 22 comprend un disque radial 23 de dimension correspondant à la portion radiale 21a illustré sur les figures 1 et 2 et disposé sensiblement au même endroit dans le roulement 1. L'élément d'étanchéité 22 se complète par un bourrelet annulaire 24, par exemple en caoutchouc ou en élastomère surmoulé sur le bord extérieur du disque 23. Le diamètre extérieur du disque 23 est inférieur à l'alésage du rebord tubulaire 12b du support 12. Le bourrelet 24 est disposé, à l'état monté, en contact d'un côté, avec la surface oblique 10c de la rainure 10, et de l'autre côté avec l'extrémité libre 12c de forme tronconique du support 12.The variant illustrated in FIG. 3 is similar to what has been described above, except that the sealing element 22 comprises a radial disc 23 of dimension corresponding to the radial portion 21a illustrated in FIGS. 1 and 2 and disposed substantially in the same place in the bearing 1. The sealing element 22 is completed by an annular bead 24, for example of rubber or of elastomer molded on the outer edge of the disc 23. The outer diameter of the disc 23 is smaller to the bore of the tubular rim 12b of the support 12. The bead 24 is arranged, in the assembled state, in contact on one side with the oblique surface 10c of the groove 10, and on the other side with the free end 12c in shape tapered support 12.
Ainsi, une excellente étanchéité est obtenue entre le disque 23 et la bague extérieure 2. Le bourrelet 24 qui est légèrement comprimé à l'état monté, exerce une précontrainte sur l'extrémité libre 12c, cette précontrainte est essentiellement dirigée radialement vers l'extérieur et tend donc à renforcer le maintien dudit support 12 dans la rainure 10 de la bague extérieure 2. Le montage de l'élément d'étanchéité 22 s'effectue en le rentrant à force dans l'alésage du rebord tubulaire 12b du support 12, le bourrelet 24 se déployant dans la rainure 10 à la fin du mouvement radial de montage.Thus, an excellent seal is obtained between the disc 23 and the outer ring 2. The bead 24 which is slightly compressed in the assembled state, exerts a preload on the free end 12c, this preload is essentially directed radially outward and therefore tends to reinforce the retention of said support 12 in the groove 10 of the outer ring 2. The sealing element 22 is mounted by forcing it into the bore of the tubular rim 12b of the support 12, the bead 24 deploying in the groove 10 at the end of the radial mounting movement.
Dans les deux variantes décrites ci-dessus, on pourrait fort bien prévoir une lèvre d'étanchéité solidaire de l'élément d'étanchéité 21 ou 22 et venant coopérer avec le support 17 du codeur 16 ou encore une lèvre d'étanchéité solidaire dudit support 17 et venant frotter sur l'élément d'étanchéité 21. L'encombrement axial du roulement instrumenté 1 n'est pas modifié par la présence de l'élément d'étanchéité qui est monté à un emplacement similaire à celui d'un roulement conventionnel étanche mais non instrumenté. L'élément d'étanchéité utilise de façon judicieuse l'espace axial de toute façon nécessaire pour l'accrochage du bloc capteur 1 dans la rainure 10. L'élément d'étanchéité est de forme simple et constitue une pièce distincte du bloc-capteur dont les différents éléments présentent aussi des formes relativement simples.In the two variants described above, one could very well provide a sealing lip integral with the sealing element 21 or 22 and coming to cooperate with the support 17 of the encoder 16 or else a sealing lip integral with said support 17 and rubbing against the sealing element 21. The axial size of the instrumented bearing 1 is not modified by the presence of the sealing element which is mounted at a location similar to that of a conventional bearing waterproof but not instrumented. The sealing element judiciously uses the axial space anyway necessary for the attachment of the sensor block 1 in the groove 10. The sealing element is simple in shape and constitutes a separate part from the sensor block the various elements of which also have relatively simple shapes.
Dans le mode de réalisation illustré sur les figures 4 et 5, les éléments semblables à ceux des figures précédentes portent les mêmes références. Le bloc capteur 1 1 comprend deux parties 25 et 26. La première partie 25 est accrochée à la bague extérieure 2 et supporte une source lumineuse 27. La deuxième partie 26 est accrochée à la première partie 25 et supporte un capteur optique 28. Un espace axial est prévu entre la source lumineuse 27 et le capteur optique 28. Plus précisément, la première partie 25 réalisée en matériau synthétique, comprend une portion tubulaire 25a dont une extrémité libre est en contact avec la surface radiale 2a de la bague extérieure 2, et une portion radiale 25b s'étendant vers l'intérieur à partir de l'alésage de la portion tubulaire 25a. La portion tubulaire 25a et la portion radiale 25b sont annulaires et présentent sensiblement une forme de T. La source lumineuse 27 affleure une surface radiale de la portion radiale 25b du côté opposé aux éléments roulants 6. La première partie 25 comprend encore une portion d'accrochage 25c s'étendant à partir de l'extrémité de petit diamètre de la portion radiale 25b, en direction des éléments roulants 6. La portion d'accrochage 25c est de forme générale cylindrique et est découpée à son extrémité libre opposée à la portion radiale 25b en une pluralité de languettes élastiques 29. Chaque languette élastique 29 est pourvue d'un crochet 30 s'étendant radialement vers l'extérieur et étant en contact avec la surface concave 10b de la rainure 10. Les languettes 29 comprennent en outre des ergots 31 disposés sur leur surface intérieure et dont la fonction sera expliquée plus loin. Les ergots 31 présentent une surface sensiblement radiale du côté des éléments roulants 6 et une pente oblique du côté opposé aux éléments roulants 6.In the embodiment illustrated in Figures 4 and 5, elements similar to those of the previous figures have the same references. The sensor block 1 1 comprises two parts 25 and 26. The first part 25 is attached to the outer ring 2 and supports a light source 27. The second part 26 is attached to the first part 25 and supports an optical sensor 28. A space axial is provided between the light source 27 and the optical sensor 28. More specifically, the first part 25 made of synthetic material, comprises a tubular portion 25a of which a free end is in contact with the radial surface 2a of the outer ring 2, and a radial portion 25b extending inward from the bore of the tubular portion 25a. The tubular portion 25a and the radial portion 25b are annular and have substantially a T shape. The source light 27 is flush with a radial surface of the radial portion 25b on the side opposite to the rolling elements 6. The first part 25 also includes a hooking portion 25c extending from the small diameter end of the radial portion 25b, in direction of the rolling elements 6. The attachment portion 25c is generally cylindrical in shape and is cut at its free end opposite the radial portion 25b into a plurality of elastic tabs 29. Each elastic tab 29 is provided with a hook 30 s 'extending radially outwards and being in contact with the concave surface 10b of the groove 10. The tongues 29 further comprise lugs 31 arranged on their inner surface and the function of which will be explained later. The pins 31 have a substantially radial surface on the side of the rolling elements 6 and an oblique slope on the side opposite to the rolling elements 6.
La deuxième partie 26 du bloc capteur 11 , réalisée en matériau synthétique, est de forme générale annulaire et radiale et présente une protubérance axiale 32, de forme annulaire emmanchée dans l'alésage de la portion tubulaire 25a de la première partie 25 à son extrémité opposée à la surface radiale 2a de la bague extérieure 2. Le capteur optique 28 affleure une surface radiale 26a et est disposé en regard de la source lumineuse 27. La surface radiale 26 est disposée à proximité de la protubérance axiale 32 et est entourée par cette dernière. La deuxième partie 26 présente également une rainure annulaire axiale 26b adjacente à la surface radiale 26a et de diamètre inférieur.The second part 26 of the sensor block 11, made of synthetic material, is of generally annular and radial shape and has an axial protuberance 32, of annular shape fitted into the bore of the tubular portion 25a of the first part 25 at its opposite end to the radial surface 2a of the outer ring 2. The optical sensor 28 is flush with a radial surface 26a and is arranged opposite the light source 27. The radial surface 26 is disposed near the axial protuberance 32 and is surrounded by the latter . The second part 26 also has an axial annular groove 26b adjacent to the radial surface 26a and of smaller diameter.
Le codeur 16 comprend un support 33 et une partie active 34 formés de façon monobloc et réalisés en métal. Le support 33 comprend une portion radiale 33a en contact avec la surface radiale 4b de la bague intérieure 4 sur son bord intérieur, et une protubérance axiale 33b s'étendant axialement en direction des éléments roulants 6 à partir de la portion radiale 33a et emmanchée sur la portée 4c de la bague intérieure 4. Le support 33 du codeur 16 comprend encore une portion tubulaire 33c s'étendant axialement à l'opposé des éléments roulants 6 à partir de l'extrémité libre de grand diamètre de la portion radiale 33a. La portion tubulaire 33c est de diamètre inférieur à l'alésage de la portion d'accrochage 25c de la première partie 25 du bloc capteur 1 1 et fait saillie par son extrémité libre dans la rainure 26b de la deuxième partie 26 du bloc capteur 1 1 avec laquelle elle forme un passage étroit assurant l'étanchéité. La partie active 34 du codeur 16 est de forme radiale s'étendant vers l'extérieur à partir de la surface extérieure de la portion tubulaire 33c du support 33 et est disposée dans l'espace axial existant entre la source lumineuse 27 et le capteur optique 28. La partie active 34 est de diamètre inférieur à l'alésage de la protubérance 32 qui l'entoure. La partie active 34 est découpée en une pluralité de créneaux 35 circonférentiellement régulièrement espacés de façon qu'un faisceau lumineux émis par la source 27 traverse périodiquement les créneaux 35 de la partie active 34, la périodicité étant liée à la vitesse de rotation relative contre le codeur 16 et le bloc capteur 11.The encoder 16 comprises a support 33 and an active part 34 formed in a single piece and made of metal. The support 33 comprises a radial portion 33a in contact with the radial surface 4b of the inner ring 4 on its inner edge, and an axial protuberance 33b extending axially in the direction of the rolling elements 6 from the radial portion 33a and fitted on the range 4c of the inner ring 4. The support 33 of the encoder 16 further comprises a tubular portion 33c extending axially opposite the rolling elements 6 from the free end of large diameter of the radial portion 33a. The tubular portion 33c is of smaller diameter than the bore of the attachment portion 25c of the first part 25 of the sensor block 1 1 and protrudes by its free end in the groove 26b of the second part 26 of the block sensor 1 1 with which it forms a narrow passage ensuring sealing. The active part 34 of the encoder 16 is of radial shape extending outward from the outer surface of the tubular portion 33c of the support 33 and is arranged in the axial space existing between the light source 27 and the optical sensor 28. The active part 34 has a diameter less than the bore of the protuberance 32 which surrounds it. The active part 34 is cut into a plurality of slots 35 circumferentially regularly spaced so that a light beam emitted by the source 27 periodically crosses the slots 35 of the active part 34, the periodicity being linked to the relative speed of rotation against the encoder 16 and sensor block 11.
Le roulement instrumenté 1 comprend encore un élément d'étanchéité 36 comprenant un disque annulaire radial 37 métallique et un revêtement souple 38 solidarisé avec le disque 37 et disposé sur la surface radiale dudit disque 37 du côté des éléments roulants 6 et à proximité immédiate de son bord extérieur. L'élément d'étanchéité 36 est disposé axialement entre la cage 7 et la portion radiale 33a du support 33 du codeur 16 et axialement entre la protubérance d'emmanchement 33b dudit support 33 et la portion d'accrochage 25c de la première partie 25 du bloc capteur H .The instrumented bearing 1 also comprises a sealing element 36 comprising a radial annular disc 37 of metal and a flexible coating 38 secured to the disc 37 and disposed on the radial surface of said disc 37 on the side of the rolling elements 6 and in close proximity to its outer edge. The sealing element 36 is disposed axially between the cage 7 and the radial portion 33a of the support 33 of the encoder 16 and axially between the fitting protrusion 33b of said support 33 and the attachment portion 25c of the first part 25 of the sensor block H.
Plus précisément, le revêtement 38 de l'élément d'étanchéité 36 est en contact avec la surface oblique 10c de la rainure 10. La surface extérieure du disque annulaire 37 est en contact avec la surface intérieure des crochets 30 et est retenue par les ergots 31 contre tout mouvement axial de démontage allant dans une direction opposée aux éléments roulants 6.More specifically, the coating 38 of the sealing element 36 is in contact with the oblique surface 10c of the groove 10. The exterior surface of the annular disc 37 is in contact with the interior surface of the hooks 30 and is retained by the pins. 31 against any axial disassembly movement going in a direction opposite to the rolling elements 6.
Le montage de l'ensemble codeur-capteur s'effectue dans le même ordre que pour le mode de réalisation des figures 1 à 3. On vient tout d'abord fixer la première partie 25 en disposant les crochets 30 dans la rainure 10. Puis, on force axialement l'élément d'étanchéité 36 qui glisse le long de la surface intérieure de la portion d'accrochage 25c, franchit les ergots 31 et trouve sa position définitive axialement entre les ergots 31 et la surface oblique 10c de la rainure 10. Dans cette position, les crochets 30 sont maintenus dans la rainure 10 dont ils ne peuvent plus sortir. On emmanche ensuite le codeur 16 sur la portée 4c de la bague intérieure 4 jusqu'à ce que la portion radiale 33a du support 33 entre en contact avec la surface radiale 4b de la bague intérieure 4. Enfin, on vient emmancher la deuxième partie 26 du bloc capteur 1 1 dans l'alésage de la portion tubulaire 25a de la première partie 25, la solidarisation définitive des deux parties 25 et 26 du bloc capteur pouvant se faire par soudure ultra-sons par exemple.The assembly of the encoder-sensor assembly is carried out in the same order as for the embodiment of FIGS. 1 to 3. The first part 25 is first fixed by placing the hooks 30 in the groove 10. Then , the sealing element 36 is forced axially which slides along the inner surface of the hooking portion 25c, crosses the pins 31 and finds its final position axially between the pins 31 and the oblique surface 10c of the groove 10 In this position, the hooks 30 are held in the groove 10 from which they can no longer come out. The encoder 16 is then connected to the bearing 4c of the inner ring 4 until the radial portion 33a of the support 33 comes into contact with the radial surface 4b of the inner ring 4. Finally, the second part 26 of the sensor block 1 1 is fitted into the bore of the tubular portion 25a of the first part 25, the final connection of the two parts 25 and 26 of the sensor unit can be done by ultrasonic welding for example.
L'étanchéité statique entre l'élément d'étanchéité 36 et la bague extérieure 2 est assurée par le revêtement souple 38 en élastomère ou équivalent. L'étanchéité dynamique entre l'élément d'étanchéité 36 et la partie tournante est assurée par le passage étroit formé entre le disque radial 37 et, d'une part, la protubérance d'emmanchement 33b et, d'autre part, la portion radiale 33a du support 33. L'étanchéité statique entre le support 33 et la bague intérieure 4 est assurée par l'emmanchement de la protubérance 33b sur la portée 4c. L'étanchéité dynamique entre le codeur 16 et le bloc capteur 1 1 est assurée par le passage étroit réalisé par l'extrémité libre de la portion cylindrique 33c du support 33 en saillie dans la rainure 26b de la première partie 26 du bloc capteur 1 1.The static seal between the sealing element 36 and the outer ring 2 is ensured by the flexible coating 38 made of elastomer or equivalent. The dynamic seal between the sealing element 36 and the rotating part is ensured by the narrow passage formed between the radial disc 37 and, on the one hand, the fitting protrusion 33b and, on the other hand, the portion radial 33a of the support 33. The static seal between the support 33 and the inner ring 4 is ensured by the fitting of the protuberance 33b on the bearing 4c. The dynamic seal between the encoder 16 and the sensor block 1 1 is ensured by the narrow passage produced by the free end of the cylindrical portion 33c of the support 33 projecting into the groove 26b of the first part 26 of the sensor block 1 1 .
Ainsi, le serrage radial du disque 37 de l'élément d'étanchéité 36 dans la couronne de crochets de fixation 30 a pour effet de renforcer le serrage radial des crochets 30 dans la rainure 10 et donc le maintien du bloc capteur 1 1 dans la bague extérieure 2. Les petits ergots 31 en saillie vers l'intérieur empêchent tout démontage de l'élément d'étanchéité 36 après sa mise en place. Là encore, l'élément d'étanchéité 36 est fixé dans la zone axiale de la rainure 10 et n'augmente en rien l'encombrement axial du roulement instrumenté 1.Thus, the radial tightening of the disc 37 of the sealing element 36 in the ring of fixing hooks 30 has the effect of reinforcing the radial tightening of the hooks 30 in the groove 10 and therefore the retention of the sensor block 1 1 in the outer ring 2. The small lugs 31 projecting inwards prevent any disassembly of the sealing element 36 after its installation. Here again, the sealing element 36 is fixed in the axial region of the groove 10 and does not in any way increase the axial size of the instrumented bearing 1.
Dans la variante de la figure 6, les éléments semblables à ceux des figures 4 à 5 portent les mêmes références. L'élément d'étanchéité 39 comprend une partie rigide 40 réalisée en tôle, une lèvre d'étanchéité 41 surmoulée sur le bord intérieur de la partie rigide 40 et venant frotter sur la surface extérieure de la protubérance 33b du support 33 du codeur 16, assurant ainsi une excellente étanchéité dynamique, et un revêtement souple 42 surmoulé sur la partie rigide 40 et en contact avec la surface oblique 10c de la rainure 10. Le revêtement 42 et la lèvre d'étanchéité 41 peuvent être réalisés en élastomère, en caoutchouc ou en tout autre matériau équivalent permettant d'assurer une étanchéité statique dans un cas dynamique dans l'autre.In the variant of Figure 6, elements similar to those of Figures 4 to 5 have the same references. The sealing element 39 comprises a rigid part 40 made of sheet metal, a sealing lip 41 molded onto the inner edge of the rigid part 40 and rubbing against the external surface of the protrusion 33b of the support 33 of the encoder 16, thus ensuring excellent dynamic sealing, and a flexible coating 42 molded onto the rigid part 40 and in contact with the oblique surface 10c of the groove 10. The coating 42 and the sealing lip 41 can be made of elastomer, rubber or any other equivalent material ensuring a static seal in a dynamic case in the other.
La partie rigide 40, qui est de forme générale radiale, est pourvue sur son bord extérieur d'une extrémité oblique 40a en contact avec la surface intérieure 30a de la couronne de crochets 30. Ladite surface intérieure 30a est en concordance de forme avec ladite extrémité obliqueThe rigid part 40, which is generally radial in shape, is provided on its outer edge with an oblique end 40a in contact with the inner surface 30a of the ring of hooks 30. Said inner surface 30a is in shape agreement with said end oblique
40a. L'extrémité dynamique 40a est également en contact avec les ergots 31 empêchant un démontage. L'extrémité libre 40a est formée de façon que sa pente par rapport à l'axe du roulement 1 tende à empêcher le démontage de la première partie 25 du bloc capteur 1 1. Ainsi, lors du montage de l'élément d'étanchéité 39, l'extrémité libre 40a vient s'encliqueter au-delà des ergots 31 et s'oppose avec une particulière efficacité à un mouvement de démontage.40a. The dynamic end 40a is also in contact with the pins 31 preventing disassembly. The free end 40a is formed so that its slope relative to the axis of the bearing 1 tends to prevent disassembly of the first part 25 of the sensor block 1 1. Thus, during the mounting of the sealing element 39 , the free end 40a snaps beyond the lugs 31 and is particularly effective against a disassembly movement.
Grâce à l'invention, on réalise un palier à roulement instrumenté compact, particulièrement bien protégé et de fabrication économique grâce à l'utilisation d'éléments standards, tant pour la bague extérieure que pour la bague intérieure du roulement. Le montage des différents éléments de l'ensemble codeur-capteur s'effectue par des mouvements axiaux simples, par exemple réalisés au moyen d'une presse, ce qui est peu coûteux. Thanks to the invention, a compact instrumented rolling bearing is produced, which is particularly well protected and of economical manufacture thanks to the use of standard elements, both for the outer ring and for the inner ring of the bearing. The various elements of the encoder-sensor assembly are assembled by simple axial movements, for example produced by means of a press, which is inexpensive.

Claims

REVENDICATIONS
1. Dispositif de palier à roulement instrumenté, du type pourvu d'une partie non tournante comprenant une bague non tournante (2) et un moyen capteur (11), d'une partie tournante comprenant une bague tournante (4) et un moyen codeur (16), et d'au moins une rangée d'éléments roulants (6) disposés entre deux chemins de roulement des bagues non tournante et tournante, le moyen capteur étant fixé dans une rainure (10) de la bague non tournante disposée à proximité d'une face latérale radiale (2a) de ladite bague non tournante, la partie non tournante comprenant, en outre, un moyen d'étanchéité (21) disposé axialement entre le moyen capteur et les éléments roulants sensiblement au niveau de la rainure (10), le moyen d'étanchéité étant distinct du moyen capteur caractérisé par le fait que le moyen d'étanchéité est disposé radialement entre un support du moyen capteur et la bague tournante.1. Instrumented rolling bearing device, of the type provided with a non-rotating part comprising a non-rotating ring (2) and a sensor means (11), a rotating part comprising a rotating ring (4) and an encoder means (16), and at least one row of rolling elements (6) arranged between two raceways of the non-rotating and rotating rings, the sensor means being fixed in a groove (10) of the non-rotating ring arranged nearby a radial lateral face (2a) of said non-rotating ring, the non-rotating part further comprising a sealing means (21) disposed axially between the sensor means and the rolling elements substantially at the level of the groove (10 ), the sealing means being distinct from the sensor means characterized in that the sealing means is disposed radially between a support of the sensor means and the rotating ring.
2. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que le moyen d'étanchéité comprend une portion sensiblement radiale (21a) de forme annulaire et une portion d'accrochage en contact avec le moyen capteur.2. Device according to any one of the preceding claims, characterized in that the sealing means comprises a substantially radial portion (21a) of annular shape and a hooking portion in contact with the sensor means.
3. Dispositif selon la revendication 2, caractérisé par le fait que la portion d'accrochage est montée avec un serrage radial sur le moyen capteur.3. Device according to claim 2, characterized in that the attachment portion is mounted with a radial clamping on the sensor means.
4. Dispositif selon la revendication 2 ou 3, caractérisé par le fait que la portion d'accrochage du moyen d'étanchéité est également en contact avec la bague non tournante.4. Device according to claim 2 or 3, characterized in that the attachment portion of the sealing means is also in contact with the non-rotating ring.
5. Dispositif selon l'une quelconque des revendications 2 à 4, caractérisé par le fait que la portion d'accrochage du moyen d'étanchéité comprend un bourrelet (24) en matériau souple.5. Device according to any one of claims 2 to 4, characterized in that the attachment portion of the sealing means comprises a bead (24) of flexible material.
6. Dispositif selon l'une quelconque des revendications 2 à 4, caractérisé par le fait que la portion d'accrochage du moyen d'étanchéité comprend un rebord oblique (21b) issu de la portion sensiblement radiale. 6. Device according to any one of claims 2 to 4, characterized in that the attachment portion of the sealing means comprises an oblique flange (21b) coming from the substantially radial portion.
7. Dispositif selon l'une quelconque des revendications précédentes, caractérisé par le fait que le moyen capteur comprend une ouverture de montage du moyen d'étanchéité, située à l'opposé des éléments roulants et permettant l'introduction dudit moyen d'étanchéité dans le moyen capteur en direction des éléments roulants.7. Device according to any one of the preceding claims, characterized in that the sensor means comprises an opening for mounting the sealing means, situated opposite the rolling elements and allowing the introduction of said sealing means in the sensor means towards the rolling elements.
8. Procédé de montage d'un palier à roulement instrumenté du type pourvu d'une partie non tournante comprenant une bague non tournante et un moyen capteur, d'une partie tournante comprenant une bague tournante et un moyen codeur, et d'au moins une rangée d'éléments roulants disposés entre deux chemins de roulement des bagues non tournante et tournante, dans lequel on dispose un moyen d'étanchéité axialement entre le moyen capteur et les éléments roulants, le moyen d'étanchéité étant distinct du moyen capteur, le moyen capteur étant fixé dans une rainure de la bague non tournante disposée à proximité d'une face latérale radiale de ladite bague non tournante, le moyen d'étanchéité étant disposé sensiblement au niveau de la rainure, le moyen d'étanchéité étant disposé radialement entre un support du moyen capteur et la bague tournante. 8. Method of mounting an instrumented rolling bearing of the type provided with a non-rotating part comprising a non-rotating ring and a sensor means, a rotating part comprising a rotating ring and an encoder means, and at least a row of rolling elements arranged between two raceways of the non-rotating and rotating rings, in which there is a sealing means axially between the sensor means and the rolling elements, the sealing means being distinct from the sensor means, the sensor means being fixed in a groove of the non-rotating ring disposed near a radial lateral face of said non-rotating ring, the sealing means being disposed substantially at the level of the groove, the sealing means being disposed radially between a support for the sensor means and the rotating ring.
9. Procédé selon la revendication 9, dans lequel le moyen d'étanchéité vient serrer radialement sur le moyen capteur.9. The method of claim 9, wherein the sealing means is radially clamped on the sensor means.
10. Procédé selon la revendication 9 ou 10, dans lequel on monte le moyen d'étanchéité par une ouverture du moyen capteur située à l'opposé des éléments roulants. 10. The method of claim 9 or 10, wherein the sealing means is mounted by an opening of the sensor means located opposite the rolling elements.
EP01913945A 2000-03-24 2001-03-07 Instrumented antifriction bearing provided with a sealing device Withdrawn EP1266228A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0003803 2000-03-24
FR0003803A FR2806764B1 (en) 2000-03-24 2000-03-24 INSTRUMENT ROLLING BEARING PROVIDED WITH A SEALING DEVICE
PCT/FR2001/000675 WO2001073447A1 (en) 2000-03-24 2001-03-07 Instrumented antifriction bearing provided with a sealing device

Publications (1)

Publication Number Publication Date
EP1266228A1 true EP1266228A1 (en) 2002-12-18

Family

ID=8848494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01913945A Withdrawn EP1266228A1 (en) 2000-03-24 2001-03-07 Instrumented antifriction bearing provided with a sealing device

Country Status (6)

Country Link
US (1) US6796713B2 (en)
EP (1) EP1266228A1 (en)
JP (1) JP2003529033A (en)
CA (1) CA2404305A1 (en)
FR (1) FR2806764B1 (en)
WO (1) WO2001073447A1 (en)

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JP5169886B2 (en) * 2009-02-03 2013-03-27 日本精工株式会社 Rolling bearing unit with rotational speed detector
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Also Published As

Publication number Publication date
FR2806764B1 (en) 2002-08-23
US6796713B2 (en) 2004-09-28
WO2001073447A1 (en) 2001-10-04
JP2003529033A (en) 2003-09-30
FR2806764A1 (en) 2001-09-28
US20040028304A1 (en) 2004-02-12
CA2404305A1 (en) 2001-10-04

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