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EP2217423A1 - Tensioning roller or winder device - Google Patents

Tensioning roller or winder device

Info

Publication number
EP2217423A1
EP2217423A1 EP08848247A EP08848247A EP2217423A1 EP 2217423 A1 EP2217423 A1 EP 2217423A1 EP 08848247 A EP08848247 A EP 08848247A EP 08848247 A EP08848247 A EP 08848247A EP 2217423 A1 EP2217423 A1 EP 2217423A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
bore
inner ring
bushing
bearing
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Withdrawn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
EP08848247A
Other languages
German (de)
French (fr)
Inventor
Benoît Arnault
Laurent Varnoux
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF AB
Original Assignee
SKF AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SKF AB filed Critical SKF AB
Publication of EP2217423A1 publication Critical patent/EP2217423A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • F16C13/006—Guiding rollers, wheels or the like, formed by or on the outer element of a single bearing or bearing unit, e.g. two adjacent bearings, whose ratio of length to diameter is generally less than one
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B29C45/1459—Coating annular articles
    • 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
    • F16C23/00—Bearings for exclusively rotary movement adjustable for aligning or positioning
    • F16C23/10—Bearings, parts of which are eccentrically adjustable with respect to each other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/07—Fixing them on the shaft or housing with interposition of an element
    • F16C35/073—Fixing them on the shaft or housing with interposition of an element between shaft and inner race ring
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H7/10—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley
    • F16H7/12—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley
    • F16H7/1209—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means
    • F16H7/1245—Means for varying tension of belts, ropes, or chains by adjusting the axis of a pulley of an idle pulley with vibration damping means of the dissipating material type, e.g. elastomeric spring
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/18—Means for guiding or supporting belts, ropes, or chains
    • F16H7/20—Mountings for rollers or pulleys
    • 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
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B41/00—Measures against loss of bolts, nuts, or pins; Measures against unauthorised operation of bolts, nuts or pins
    • F16B41/002—Measures against loss of bolts, nuts or pins
    • 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
    • F16C19/08—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 two or more rows of balls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/30—Material joints
    • 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
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/63—Gears with belts and pulleys
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0842—Mounting or support of tensioner
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0863—Finally actuated members, e.g. constructional details thereof
    • F16H2007/0865—Pulleys
    • 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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/08—Means for varying tension of belts, ropes, or chains
    • F16H2007/0876—Control or adjustment of actuators
    • F16H2007/088—Manual adjustment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49544—Roller making
    • Y10T29/49547—Assembling preformed components
    • Y10T29/49549—Work contacting surface element assembled to core

Definitions

  • Tensioner roller device or winder
  • the present invention relates to the field of tensioning rollers or reels intended to cooperate with a chain or a belt, for example an internal combustion engine combustion engine timing belt of a motor vehicle.
  • rollers are generally used to permanently maintain a tension on the belt or chain in a specific range or to locally change the path taken by it.
  • the pulley is rotatably mounted on an axis by means of a bearing, the roller then being attached directly or indirectly to the engine block or to an element of the tensioner device, for example an articulated arm or an eccentric.
  • DE-Al-100 35 488 discloses a mounting device for a belt pulley comprising a sleeve provided with a spacer collar for the inner ring of the bearing, and a retaining tube cooperating with the sleeve to engage bearing against the inner ring axially on the opposite side to the collar.
  • the document FR-B 1 -2 758 375 describes a tensioning roller comprising a pivoting body, a bearing mounted on said body, and a bushing bushing made of metallic material for receiving the fixing pin intended to be attached to the engine block.
  • the pivoting body is obtained by overmolding a synthetic material in the bearing bore and on the outer surface of the bushing bushing.
  • DE-U 1 -298 05 581 discloses a tensioning roller comprising a bearing, a pulley overmolded on the outer ring of the bearing, and a filling body overmolded in the bore of the inner ring of the bearing and on a fixing pin.
  • the tensioning rollers described in these two documents have the major disadvantage of not being easily adaptable to the dimension of the axis or the fixing screw intended to be mounted on the engine block.
  • the present invention therefore aims to overcome these disadvantages. More particularly, the present invention aims to provide a tensioner roller device particularly easy to manufacture, to assemble, and limited space.
  • the present invention also aims to provide a device for easily adapting and economically to the size of the fastening screws to be used by car manufacturers.
  • the tensioning roller device or belt or chain winder is provided with a bearing comprising an inner ring, an outer ring and at least one row. of rolling elements mounted between the rings, a pulley overmolded on the outer ring and a fastening screw immobilized axially with respect to the bearing.
  • the device comprises a bushing overmolded in the bore of the inner ring and provided with a through bore for mounting the fastening screw.
  • the bushing further comprises means for axially retaining the fixing screw inside the bore passing through the bushing.
  • the adaptation of the bore of the pulley with respect to the diameter of the fixing screw is via the bushing advantageously made of synthetic material.
  • the use of such a socket makes its mounting particularly simple.
  • the existence of the through bore at the socket allows the use of a standard pin or screw.
  • the provision of a sleeve provided with axial retaining means of the fastening screw makes it possible to obtain a unitary assembly that can be stored, transported and handled without the risk of separation of the elements constituting it, and without requiring additional separate elements.
  • the sleeve itself comprises the retaining means, which can advantageously be made in one piece with it.
  • the fixing screw is in direct contact with the through bore.
  • the axial retaining means comprise a threaded portion adapted to cooperate with a threaded portion of the fastening screw.
  • the outside diameter of the bushing is smaller than the inside diameter of a front radial surface of the inner bushing.
  • a bearing which comprises an inner ring having a completely clear radial front surface. This greatly facilitates the mounting of elements against said front surface of the ring, for example an axial stop member.
  • front radial surfaces of the bushing are recessed or flush with front radial surfaces of the inner ring.
  • the sleeve comprises, at one axial end, a spacer axially bearing against the inner ring.
  • the socket is an eccentric socket.
  • the device may also comprise a protective flange mounted on the socket.
  • the protective flange advantageously comprises a tubular axial portion fitted into a large diameter portion of the bore of the sleeve.
  • the flange may be mounted in abutment against a radial front surface of the inner ring.
  • the pulley and the bushing are made from the same synthetic material.
  • FIG. 1 is a front view in elevation of a belt or chain roller according to a first embodiment of the invention
  • FIG. 2 is a view in axial section along the line H-II of FIG. 1;
  • FIG. 3 is a view in axial section of a roller according to a second embodiment of the invention
  • FIG. 4 is a view in axial section of a roller according to a third embodiment of the invention
  • FIG. 5 is a detail view of FIG. 4,
  • FIG. 6 to 8 are views in axial section of a roller according to fourth, fifth and sixth embodiments of the invention.
  • FIGS. 9 and 10 are front views of a roller according to a seventh embodiment of the invention.
  • FIG. 1 1 is a sectional view along the axis XI-XI of Figure 10
  • - Figure 12 is a front view of a roller according to an eighth embodiment of the invention.
  • FIG. 13 is a sectional view of a roller along the axis XIII-XIII of Figure 12.
  • the roller referenced 10 as a whole comprises a pulley 12, a bearing 14 of axis
  • the pulley 12 comprises an outer portion 22 having an outer surface for cooperating with a belt or chain (not shown), an inner portion 24 and an axial axial intermediate portion 26 radial connecting said portions.
  • the outer 22 and inner 24 are coaxial with the axis 20.
  • the inner portion 24 has a bore 24a provided with annular ribs 28 and defined axially by two lateral radial surfaces 24b and 24c.
  • the bearing 14 comprises an inner ring 30, an outer ring 32, two rows of rolling elements 34 and 36 arranged in parallel planes held respectively by cages 38 and 40, and two seals 42 and 44.
  • the inner ring 30 comprises an outer surface 30a of revolution in which are formed raceways for the rolling elements 34 and 36, and grooves for making contact with the lips of the sealing members 42 and 44.
  • the inner ring 30 also comprises a 30b bore in contact with the sleeve 16 delimited by two lateral radial front surfaces 30c and 30d.
  • the cages 38 and 40 maintain the regular circumferential spacing of the rolling elements 34 and 36.
  • the outer 32 and inner 30 rings are respectively monobloc.
  • the outer ring 32 is provided with a bore 32a in which are formed rolling tracks for the rolling elements 34 and 36 and grooves in which are fitted the sealing members 42 and 44.
  • the sealing members 42 and 44 provide a static seal with the rotating outer ring 32 and a dynamic seal with the non-rotating inner ring 30.
  • the outer ring 1 1 also has an outer surface 32d and radial front surfaces 32b and 32c axially aligned with the radial surfaces 30c and 30d .
  • Annular grooves 46 are formed from the outer surface 32d of the outer ring 32 in complementary form with the ribs 28 projecting from the bore 24a of the pulley 12.
  • the pulley 12 is overmolded on the outer ring 32. This results in excellent cohesion between these two parts, in particular at the level of the annular grooves 34 of the outer ring 32 in which penetrates the molten plastic material to form the annular ribs 28 of the pulley 12 by shape complementarity.
  • the bushing 16 of generally annular shape and of axis 20, has a cylindrical outer surface 16a of revolution, two lateral radial front surfaces 16b and 16c, and a cylindrical through bore 16d in contact with the screw 18.
  • the bore 16d or central opening passes axially right through the sleeve 16 and opens out at the surfaces 16b and 16c.
  • the sleeve 16 is overmolded in the bore 30b of the inner ring 30. This provides excellent cohesion between these two parts.
  • the bore of the inner ring 30 is smooth, it is conceivable that it could be possible to provide annular or helical grooves formed on said bore and directed radially towards the sleeve 16 in order to to obtain annular or helical ribs in complementarity of shape by penetration of the molten plastic material.
  • the bushing 16 has an axial dimension smaller than that of the ring 30, and is arranged so that the front radial surfaces 16b, 16c are set back relative to the front radial surfaces 30c, 30d of the inner ring.
  • the outer diameter of the bushing 16 is smaller than the inside diameter of the front radial surfaces 30c, 30d of the inner ring. The sleeve 16 thus leaves said radial surfaces 30c, 30d completely free so that they can be used as reference surfaces and abut against any other radial surface.
  • the pulley 12 and the bushing 16 are overmolded on the bearing 14 in the same production mold, preferably with the same synthetic material, so as to obtain an economic roller 10 requiring a number of manufacturing operations. restricted.
  • a different synthetic material for the sleeve 16 for example a softer material than that used for the pulley 12 and having good characteristics of vibration damping.
  • the screw 18 comprises, meanwhile, a head 18a and a rod provided with a smooth portion 18b near the head and a threaded portion 18c opposite said head.
  • the threaded portion 18c projecting axially relative to the pulley 12 can be inserted into a threaded hole formed in a part intended to support the roller 10.
  • a washer 50 disposed between the head 18a and the surface front radial 30Od of the inner ring 30 left free by the sleeve 16.
  • the sleeve 16 is advantageously used to form an axial retaining means of the screw 18 fixing.
  • an adjustment with slight tightening is provided between the bore 16d of said sleeve and the screw 18. This adjustment is adapted to achieve an axial joining of these two elements without risk of disassembly when the device is stored, transported and handled .
  • FIG. 3 differs only in that the bore 16d of the bushing 16 is enlarged so as to be able to mount an attachment screw 18 of increased diameter.
  • the tight fit between the sleeve 16 and the fastening screw 18 is, however, retained.
  • the bushing 16 makes it possible to adapt to the various fastener screw diameters 18 while maintaining the same type and the same dimension for the bearing 14.
  • the same type of bearing can thus be used for several types of rollers 10.
  • the bushing 16 comprises, at adjacent the radial front surface 16b, an annular threaded portion 52 extending radially inwardly and cooperating with the threaded portion 18c of the fastening screw 18 so as to allow axial retention of the screw within the socket 16.
  • This threaded portion could alternatively be replaced
  • the roller 10 has no bearing washer for the head 18a of the screw, said head coming directly against the front surface 16c of the sleeve 16.
  • FIG. 7 differs from the first embodiment in that the bushing 16 has an increased axial length, and projects axially with respect to the front surface.
  • the sleeve 16 leaves free said radial front surface. It comprises an annular spacer 54 bearing against said surface 30c of the inner ring 30.
  • the spacer 54 advantageously made of metallic material, is overmolded on the outer surface 16a of the sleeve 16. It is advantageously arranged in the mold of manufacture of the roller 10 at the same time as the bearing 14, the overmoulding of the pulley 12, and the sleeve 16 to obtain a bearing-sleeve-spacer unit indémontable.
  • the embodiment illustrated in FIG. 8 on which the identical elements bear the same references differs from the first embodiment in that the bushing 16 comprises, at each axial end of the bore 16d, two portions 56, 58 of increased diameter. .
  • a 16d bore is provided for the sleeve 16.
  • a protective flange 60 advantageously made of sheet metal and being in the form of a cup of generally annular shape.
  • the flange 60 comprises an annular axial portion 60a fitted inside the portion 58 of enlarged diameter of the bore 16b which allows the passage of the fastening screw (not shown). Said screw can be mounted with a slight tightening clearance in the portion 60a so as to ensure the retention of the assembly.
  • the axial portion 60 is extended radially outwardly at a free end by a radial portion 60b bearing against the front surface 30c of the inner ring 30 and extending to the vicinity of the inner portion 24 of the pulley 12
  • the radial portion 60b is extended axially, at its large-diameter edge in the direction of the pulley 12, by an axial portion 60c located radially in the immediate vicinity of the inner portion 24 and thus forming a tight passage seal.
  • roller 10 comprises an eccentric bushing 62 of axis 64 offset radially with respect to the axis.
  • the eccentric bushing 62 has a cylindrical outer surface 62a in contact with the bore 30b of the inner race 30, two lateral radial end faces 62b and 62c, and a through bore 62d for mounting the screw 18.
  • the radial surface 62b is set back from the front surface 30c of the inner ring 30.
  • the sleeve 62 is overmolded in the bore 30b of the inner ring 30.
  • the eccentric bushing 62 comprises, at one axial end, a radial flange 66 comprising the radial surface 62c and bearing against the radial surface 30d of the inner ring 30.
  • the flange 66 has a generally hexagonal shape so as to allow, by means of a key corresponding to shape, a manual adjustment of the angular position of the eccentric bushing 62 and therefore of the tension of the belt or of the chain . Of course, this adjustment is made before tightening the screw 18 fixing.
  • FIGS. 12 and 13 differs from the embodiment previously described in that the radial flange 66 is generally cylindrical in shape and comprises two recesses.
  • the sleeve 16 is also provided with a tolerance to obtain a tight fit between the latter and the fixing screw 18 which is sufficient to ensure the axial retention of said screw .
  • roller devices that can be adapted to different screw diameters while using identical bearings.
  • the adaptation of the bore of the pulley with respect to the diameter of the screw is done through the bushing made of plastic material.
  • the sleeve provides axial retention of the fastening screw or other elements such as a spacer or a protective flange, provided to bear against one of the bearing rings.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mounting Of Bearings Or Others (AREA)
  • Pulleys (AREA)
  • Rolling Contact Bearings (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

The tensioning roller or belt or chain winder device is provided with a rolling bearing (14) comprising an inner race (30), an outer race (32) and at least one row of rolling elements (34) mounted between the races, with a pulley (12) overmoulded onto the outer race, and with a fastening screw (18) immobilized axially with respect to the rolling bearing. The device comprises a sleeve (16) which is overmoulded into the bore of the inner race and which has a through-bore (16d) for fitting the fastening screw (18). The sleeve is provided with means for axially retaining the fastening screw (18) inside the through-bore of the sleeve (16).

Description

Dispositif de galet tendeur ou enrouleur. Tensioner roller device or winder.
La présente invention concerne le domaine des galets tendeurs ou enrouleurs prévus pour coopérer avec une chaîne ou une courroie, par exemple une courroie de distribution de moteur thermique à combustion interne de véhicule automobile.The present invention relates to the field of tensioning rollers or reels intended to cooperate with a chain or a belt, for example an internal combustion engine combustion engine timing belt of a motor vehicle.
De tels galets servent généralement à maintenir en permanence une tension sur la courroie ou la chaîne dans une plage déterminée ou à modifier localement le cheminement emprunté par celle-ci. Dans les galets enrouleurs, la poulie est montée à rotation sur un axe par l' intermédiaire d'un roulement, le galet étant ensuite fixé directement ou indirectement sur le bloc moteur ou sur un élément du dispositif de galet tendeur, par exemple un bras articulé ou un excentrique.Such rollers are generally used to permanently maintain a tension on the belt or chain in a specific range or to locally change the path taken by it. In the rollers, the pulley is rotatably mounted on an axis by means of a bearing, the roller then being attached directly or indirectly to the engine block or to an element of the tensioner device, for example an articulated arm or an eccentric.
Dans de nombreux types de galets pour courroies ou chaînes de l' art antérieur, la poulie est surmoulée sur la bague extérieure du roulement qui est lui-même monté directement sur un axe de fixation rapporté sur le bloc moteur. Ainsi, en fonction de la dimension radiale de l' axe utilisé par le constructeur automobile, il convient de modifier le diamètre de l' alésage de la bague intérieure pour l' adapter audit axe. Ceci va à l'encontre d'une standardisation des roulements utilisés pour ces applications.In many types of rollers for belts or chains of the prior art, the pulley is overmolded on the outer ring of the bearing which is itself mounted directly on an attachment pin attached to the engine block. Thus, depending on the radial dimension of the axis used by the car manufacturer, it is necessary to change the diameter of the bore of the inner ring to adapt to said axis. This goes against a standardization of the bearings used for these applications.
Le document DE-Al - 100 35 488 décrit un dispositif de montage pour une poulie de courroie comprenant un manchon pourvu d'une collerette formant entretoise pour la bague intérieure du roulement, et d'un tube de retenue coopérant avec le manchon pour venir en appui contre la bague intérieure axialement du côté opposé à la collerette.DE-Al-100 35 488 discloses a mounting device for a belt pulley comprising a sleeve provided with a spacer collar for the inner ring of the bearing, and a retaining tube cooperating with the sleeve to engage bearing against the inner ring axially on the opposite side to the collar.
Cette solution présente l'inconvénient de nécessiter l'utilisation de deux éléments distincts en plus de l' ensemble formé par le roulement et la poulie, ce qui est gênant pour le transport, la manipulation et le montage de ces éléments.This solution has the disadvantage of requiring the use of two separate elements in addition to the set formed by the bearing and the pulley, which is inconvenient for the transport, handling and assembly of these elements.
Le document FR-B 1 -2 758 375 décrit un galet tendeur comportant un corps pivotant, un roulement monté sur ledit corps, et une douille de coussinet réalisée en matière métallique pour recevoir l'axe de fixation destiné à être rapporté sur le bloc moteur. Le corps pivotant est obtenu par surmoulage d'une matière synthétique dans l' alésage du roulement et sur la surface extérieure de la douille de coussinet. On connaît encore par le document DE-U 1 -298 05 581 , un galet tendeur comportant un roulement, une poulie surmoulée sur la bague extérieure du roulement, et un corps de remplissage surmoulé dans l'alésage de la bague intérieure du roulement et sur un axe de fixation.The document FR-B 1 -2 758 375 describes a tensioning roller comprising a pivoting body, a bearing mounted on said body, and a bushing bushing made of metallic material for receiving the fixing pin intended to be attached to the engine block. . The pivoting body is obtained by overmolding a synthetic material in the bearing bore and on the outer surface of the bushing bushing. DE-U 1 -298 05 581 discloses a tensioning roller comprising a bearing, a pulley overmolded on the outer ring of the bearing, and a filling body overmolded in the bore of the inner ring of the bearing and on a fixing pin.
Les galets tendeurs décrits dans ces deux documents ont pour inconvénient majeur de ne pas être aisément adaptable à la dimension de l' axe ou de la vis de fixation prévue pour être montée sur le bloc moteur.The tensioning rollers described in these two documents have the major disadvantage of not being easily adaptable to the dimension of the axis or the fixing screw intended to be mounted on the engine block.
La présente invention a donc pour but de remédier à ces inconvénients. Plus particulièrement, la présente invention vise à prévoir un dispositif de galet tendeur particulièrement facile à fabriquer, à monter, et d' encombrement restreint.The present invention therefore aims to overcome these disadvantages. More particularly, the present invention aims to provide a tensioner roller device particularly easy to manufacture, to assemble, and limited space.
La présente invention a encore pour but de prévoir un dispositif permettant de s 'adapter aisément et de manière économique à la dimension des vis de fixation devant être utilisées par les constructeurs automobiles.The present invention also aims to provide a device for easily adapting and economically to the size of the fastening screws to be used by car manufacturers.
A cet effet, le dispositif de galet tendeur ou enrouleur de courroie ou de chaîne est pourvu d'un roulement comprenant une bague intérieure, une bague extérieure et au moins une rangée d' éléments roulants montés entre les bagues, d'une poulie surmoulée sur la bague extérieure et d'une vis de fixation immobilisée axialement par rapport au roulement. Le dispositif comprend une douille surmoulée dans l' alésage de la bague intérieure et munie d'un alésage traversant pour le montage de la vis de fixation. La douille comprend en outre des moyens de retenue axiale de la vis de fixation à l' intérieur de l'alésage traversant de la douille.For this purpose, the tensioning roller device or belt or chain winder is provided with a bearing comprising an inner ring, an outer ring and at least one row. of rolling elements mounted between the rings, a pulley overmolded on the outer ring and a fastening screw immobilized axially with respect to the bearing. The device comprises a bushing overmolded in the bore of the inner ring and provided with a through bore for mounting the fastening screw. The bushing further comprises means for axially retaining the fixing screw inside the bore passing through the bushing.
Ainsi, on peut réaliser de manière particulièrement économique différents dispositifs de galets tendeurs en utilisant des roulements de mêmes dimensions. En effet, l'adaptation de l' alésage de la poulie par rapport au diamètre de la vis de fixation se fait par l' intermédiaire de la douille avantageusement réalisée en matière synthétique. L'utilisation d'une telle douille rend son montage particulièrement simple. L ' existence de l' alésage traversant au niveau de la douille permet l'utilisation d'un axe ou d'une vis de fixation standard. En outre, la prévision d'une douille pourvue de moyens de retenue axiale de la vis de fixation permet d' obtenir un ensemble unitaire pouvant être stocké, transporté et manipulé sans risque de désolidarisation des éléments le constituant, et ce, sans nécessiter d' éléments séparés additionnels. En effet, la douille comporte elle-même les moyens de retenue, qui peuvent avantageusement être réalisés monoblocs avec celle-ci.Thus, one can achieve particularly economically different devices of tensioning rollers using bearings of the same dimensions. Indeed, the adaptation of the bore of the pulley with respect to the diameter of the fixing screw is via the bushing advantageously made of synthetic material. The use of such a socket makes its mounting particularly simple. The existence of the through bore at the socket allows the use of a standard pin or screw. In addition, the provision of a sleeve provided with axial retaining means of the fastening screw makes it possible to obtain a unitary assembly that can be stored, transported and handled without the risk of separation of the elements constituting it, and without requiring additional separate elements. Indeed, the sleeve itself comprises the retaining means, which can advantageously be made in one piece with it.
Avantageusement, la vis de fixation est en contact direct avec l' alésage traversant. Dans un mode de réalisation, les moyens de retenue axiale comportent une portion filetée apte à coopérer avec une portion filetée de la vis de fixation. Dans un mode de réalisation, le diamètre extérieur de la douille est inférieur au diamètre intérieur d'une surface radiale frontale de la bague intérieure.Advantageously, the fixing screw is in direct contact with the through bore. In one embodiment, the axial retaining means comprise a threaded portion adapted to cooperate with a threaded portion of the fastening screw. In one embodiment, the outside diameter of the bushing is smaller than the inside diameter of a front radial surface of the inner bushing.
Ainsi, après surmoulage de la douille, on dispose d'un roulement qui comporte une bague intérieure présentant une surface frontale radiale entièrement dégagée. Ceci facilite grandement le montage d'éléments contre ladite surface frontale de la bague, par exemple d'un organe d' arrêt axial.Thus, after overmolding of the bushing, there is a bearing which comprises an inner ring having a completely clear radial front surface. This greatly facilitates the mounting of elements against said front surface of the ring, for example an axial stop member.
Dans un mode de réalisation, des surfaces radiales frontales de la douille sont en retrait ou affleurent avec des surfaces radiales frontales de la bague intérieure.In one embodiment, front radial surfaces of the bushing are recessed or flush with front radial surfaces of the inner ring.
Avantageusement, la douille comporte, à une extrémité axiale, une entretoise venant axialement en appui contre la bague intérieure.Advantageously, the sleeve comprises, at one axial end, a spacer axially bearing against the inner ring.
Dans un mode de réalisation, la douille est une douille excentrique.In one embodiment, the socket is an eccentric socket.
Le dispositif peut également comprendre un flasque de protection monté sur la douille. Le flasque de protection comporte avantageusement une portion axiale tubulaire emmanchée dans une portion de grand diamètre de l'alésage de la douille. Le flasque peut être monté en appui contre une surface radiale frontale de la bague intérieure.The device may also comprise a protective flange mounted on the socket. The protective flange advantageously comprises a tubular axial portion fitted into a large diameter portion of the bore of the sleeve. The flange may be mounted in abutment against a radial front surface of the inner ring.
Dans un mode de réalisation, la poulie et la douille sont réalisées à partir d'un même matériau synthétique.In one embodiment, the pulley and the bushing are made from the same synthetic material.
La présente invention sera mieux comprise à l'étude de la description détaillée de modes de réalisation pris à titre d' exemples nullement limitatifs et illustrés par les dessins annexés, sur lesquels :The present invention will be better understood on studying the detailed description of embodiments taken as non-limiting examples and illustrated by the appended drawings, in which:
- la figure 1 est une vue de face en élévation d'un galet pour courroie ou chaîne selon un premier mode de réalisation de l' invention, - la figure 2 est une vue en coupe axiale selon l'axe H-II de la figure 1 ,FIG. 1 is a front view in elevation of a belt or chain roller according to a first embodiment of the invention, FIG. 2 is a view in axial section along the line H-II of FIG. 1;
- la figure 3 est une vue en coupe axiale d'un galet selon un deuxième mode de réalisation de l' invention, - la figure 4 est une vue en coupe axiale d'un galet selon un troisième mode de réalisation de l' invention,FIG. 3 is a view in axial section of a roller according to a second embodiment of the invention, FIG. 4 is a view in axial section of a roller according to a third embodiment of the invention,
- la figure 5 est une vue de détail de la figure 4,FIG. 5 is a detail view of FIG. 4,
- les figures 6 à 8 sont des vues en coupe axiale d'un galet selon des quatrième, cinquième et sixième modes de réalisation de l' invention,- Figures 6 to 8 are views in axial section of a roller according to fourth, fifth and sixth embodiments of the invention,
- les figures 9 et 10 sont des vues de face d'un galet selon un septième mode de réalisation de l' invention,- Figures 9 and 10 are front views of a roller according to a seventh embodiment of the invention,
- la figure 1 1 est une vue en coupe selon l'axe XI-XI de la figure 10, - la figure 12 est une vue de face d'un galet selon un huitième mode de réalisation de l' invention, et- Figure 1 1 is a sectional view along the axis XI-XI of Figure 10, - Figure 12 is a front view of a roller according to an eighth embodiment of the invention, and
- la figure 13 est une vue en coupe d'un galet selon l' axe XIII- XIII de la figure 12.- Figure 13 is a sectional view of a roller along the axis XIII-XIII of Figure 12.
Comme on peut le voir sur les figures 1 et 2, le galet référencé 10 dans son ensemble comprend une poulie 12, un roulement 14 d' axeAs can be seen in Figures 1 and 2, the roller referenced 10 as a whole comprises a pulley 12, a bearing 14 of axis
20, une douille 16 annulaire et une vis de fixation 18 coaxiale à l' axe 20.20, an annular bushing 16 and a fastening screw 18 coaxial with the axis 20.
La poulie 12 comprend une partie extérieure 22 offrant une surface extérieure destinée à coopérer avec une courroie ou une chaîne (non représentée), une partie intérieure 24 axiale et une portion intermédiaire 26 annulaire radiale reliant lesdites parties. Les parties extérieure 22 et intérieure 24 sont coaxiales à l'axe 20. La partie intérieure 24 comporte un alésage 24a muni de nervures annulaires 28 et délimité axialement par deux surfaces radiales latérales 24b et 24c. Le roulement 14 comporte une bague intérieure 30, une bague extérieure 32, deux rangées d' éléments roulants 34 et 36 disposés dans des plans parallèles maintenus respectivement par des cages 38 et 40, et deux joints d'étanchéité 42 et 44. La bague intérieure 30 comprend une surface extérieure 30a de révolution dans laquelle sont ménagés des chemins de roulement pour les éléments roulants 34 et 36, et des rainures pour réaliser un contact avec des lèvres des organes d' étanchéité 42 et 44. La bague intérieure 30 comporte également un alésage 30b en contact avec la douille 16 délimité par deux surfaces radiales frontales latérales 30c et 30d. Les cages 38 et 40 maintiennent l' écartement circonférentiel régulier des éléments roulants 34 et 36. Les bagues extérieure 32 et intérieure 30 sont respectivement monoblocs.The pulley 12 comprises an outer portion 22 having an outer surface for cooperating with a belt or chain (not shown), an inner portion 24 and an axial axial intermediate portion 26 radial connecting said portions. The outer 22 and inner 24 are coaxial with the axis 20. The inner portion 24 has a bore 24a provided with annular ribs 28 and defined axially by two lateral radial surfaces 24b and 24c. The bearing 14 comprises an inner ring 30, an outer ring 32, two rows of rolling elements 34 and 36 arranged in parallel planes held respectively by cages 38 and 40, and two seals 42 and 44. The inner ring 30 comprises an outer surface 30a of revolution in which are formed raceways for the rolling elements 34 and 36, and grooves for making contact with the lips of the sealing members 42 and 44. The inner ring 30 also comprises a 30b bore in contact with the sleeve 16 delimited by two lateral radial front surfaces 30c and 30d. The cages 38 and 40 maintain the regular circumferential spacing of the rolling elements 34 and 36. The outer 32 and inner 30 rings are respectively monobloc.
La bague extérieure 32 est munie d'un alésage 32a dans lequel sont ménagés des chemins de roulement pour les éléments roulants 34 et 36 et des rainures dans lesquelles sont emmanchés les organes d' étanchéité 42 et 44. Les organes d' étanchéité 42 et 44 assurent une étanchéité statique avec la bague extérieure tournante 32 et une étanchéité dynamique avec la bague intérieure non tournante 30. La bague extérieure 1 1 comporte également une surface extérieure 32d et des surfaces radiales frontales 32b et 32c alignées axialement avec les surfaces radiales 30c et 30d. Des rainures annulaires 46 sont ménagées à partir de la surface extérieure 32d de la bague extérieure 32 en complémentarité de forme avec les nervures 28 en saillie par rapport à l' alésage 24a de la poulie 12.The outer ring 32 is provided with a bore 32a in which are formed rolling tracks for the rolling elements 34 and 36 and grooves in which are fitted the sealing members 42 and 44. The sealing members 42 and 44 provide a static seal with the rotating outer ring 32 and a dynamic seal with the non-rotating inner ring 30. The outer ring 1 1 also has an outer surface 32d and radial front surfaces 32b and 32c axially aligned with the radial surfaces 30c and 30d . Annular grooves 46 are formed from the outer surface 32d of the outer ring 32 in complementary form with the ribs 28 projecting from the bore 24a of the pulley 12.
La poulie 12 est surmoulée sur la bague extérieure 32. Il en résulte une excellente cohésion entre ces deux pièces, en particulier au niveau des rainures annulaires 34 de la bague extérieure 32 dans lesquelles pénètre la matière plastique en fusion pour former les nervures annulaires 28 de la poulie 12 par complémentarité de forme.The pulley 12 is overmolded on the outer ring 32. This results in excellent cohesion between these two parts, in particular at the level of the annular grooves 34 of the outer ring 32 in which penetrates the molten plastic material to form the annular ribs 28 of the pulley 12 by shape complementarity.
La douille 16, de forme générale annulaire et d'axe 20, comporte une surface extérieure 16a cylindrique de révolution, deux surfaces radiales frontales latérales 16b et 16c, et un alésage 16d cylindrique traversant en contact avec la vis 18. L ' alésage 16d ou ouverture centrale traverse axialement de part en part la douille 16 et débouche au niveau des surfaces 16b et 16c.The bushing 16, of generally annular shape and of axis 20, has a cylindrical outer surface 16a of revolution, two lateral radial front surfaces 16b and 16c, and a cylindrical through bore 16d in contact with the screw 18. The bore 16d or central opening passes axially right through the sleeve 16 and opens out at the surfaces 16b and 16c.
La douille 16 est surmoulée dans l' alésage 30b de la bague intérieure 30. On obtient ainsi une excellente cohésion entre ces deux pièces. Bien que dans l'exemple de réalisation illustré, l'alésage de la bague intérieure 30 soit lisse, on conçoit qu' il pourrait être possible de prévoir des rainures annulaires ou hélicoïdales ménagées sur ledit alésage et dirigées radialement vers la douille 16 afin d' obtenir des nervures annulaires ou en hélice en complémentarité de forme par pénétration de la matière plastique en fusion.The sleeve 16 is overmolded in the bore 30b of the inner ring 30. This provides excellent cohesion between these two parts. Although in the exemplary embodiment illustrated, the bore of the inner ring 30 is smooth, it is conceivable that it could be possible to provide annular or helical grooves formed on said bore and directed radially towards the sleeve 16 in order to to obtain annular or helical ribs in complementarity of shape by penetration of the molten plastic material.
La douille 16 présente une dimension axiale inférieure à celle de la bague 30, et est disposée de façon à ce que les surfaces radiales frontales 16b, 16c soient en retrait par rapport aux surfaces radiales frontales 30c, 30d de la bague intérieure. Le diamètre extérieur de la douille 16 est inférieur au diamètre intérieur des surfaces radiales frontales 30c, 30d de la bague intérieure. La douille 16 laisse donc lesdites surfaces radiales 30c, 30d complètement libres de sorte qu'elles puissent être utilisées comme surfaces de référence et venir en appui contre toute autre surface radiale.The bushing 16 has an axial dimension smaller than that of the ring 30, and is arranged so that the front radial surfaces 16b, 16c are set back relative to the front radial surfaces 30c, 30d of the inner ring. The outer diameter of the bushing 16 is smaller than the inside diameter of the front radial surfaces 30c, 30d of the inner ring. The sleeve 16 thus leaves said radial surfaces 30c, 30d completely free so that they can be used as reference surfaces and abut against any other radial surface.
Avantageusement, la poulie 12 et la douille 16 sont surmoulées sur le roulement 14 dans un même moule de fabrication, de préférence avec la même matière synthétique, de manière à obtenir un galet 10 économique nécessitant un nombre d' opérations de fabrication restreint. Toutefois, en variante on pourrait prévoir une matière synthétique différente pour la douille 16, par exemple une matière plus souple que celle utilisée pour la poulie 12 et possédant de bonnes caractéristiques d' amortissement des vibrations. La vis 18 comporte, quant à elle, une tête 18a et une tige munie d'une portion lisse 18b à proximité de la tête et d'une portion filetée 18c à l' opposé de ladite tête. La portion filetée 18c en saillie axiale par rapport à la poulie 12 peut être insérée dans un trou taraudé ménagé dans une pièce destinée à supporter le galet 10. Axialement du côté opposé, il est prévu une rondelle 50 disposée entre la tête 18a et la surface radiale frontale 3Od de la bague intérieure 30 laissée libre par la douille 16. La douille 16 est avantageusement utilisée pour former un moyen de retenue axiale de la vis 18 de fixation. A cet égard, un ajustement avec léger serrage est prévu entre l 'alésage 16d de ladite douille et la vis 18. Cet ajustement est adapté pour obtenir une solidarisation axiale de ces deux éléments sans risque de démontage lorsque le dispositif est stocké, transporté et manipulé.Advantageously, the pulley 12 and the bushing 16 are overmolded on the bearing 14 in the same production mold, preferably with the same synthetic material, so as to obtain an economic roller 10 requiring a number of manufacturing operations. restricted. However, alternatively one could provide a different synthetic material for the sleeve 16, for example a softer material than that used for the pulley 12 and having good characteristics of vibration damping. The screw 18 comprises, meanwhile, a head 18a and a rod provided with a smooth portion 18b near the head and a threaded portion 18c opposite said head. The threaded portion 18c projecting axially relative to the pulley 12 can be inserted into a threaded hole formed in a part intended to support the roller 10. Axially on the opposite side, there is provided a washer 50 disposed between the head 18a and the surface front radial 30Od of the inner ring 30 left free by the sleeve 16. The sleeve 16 is advantageously used to form an axial retaining means of the screw 18 fixing. In this regard, an adjustment with slight tightening is provided between the bore 16d of said sleeve and the screw 18. This adjustment is adapted to achieve an axial joining of these two elements without risk of disassembly when the device is stored, transported and handled .
Le mode de réalisation illustré à la figure 3 sur laquelle les éléments identiques portent les mêmes références diffère uniquement en ce que l' alésage 16d de la douille 16 est agrandi de manière à pouvoir monter une vis 18 de fixation de diamètre accru. L 'ajustement serré entre la douille 16 et la vis 18 de fixation est toutefois conservé. Ainsi, la douille 16 permet de s' adapter aux différents diamètres de vis 18 de fixation tout en conservant le même type et la même dimension pour le roulement 14. Un même type de roulement peut ainsi être utilisé pour plusieurs types de galets 10.The embodiment illustrated in FIG. 3 on which the identical elements bear the same references differs only in that the bore 16d of the bushing 16 is enlarged so as to be able to mount an attachment screw 18 of increased diameter. The tight fit between the sleeve 16 and the fastening screw 18 is, however, retained. Thus, the bushing 16 makes it possible to adapt to the various fastener screw diameters 18 while maintaining the same type and the same dimension for the bearing 14. The same type of bearing can thus be used for several types of rollers 10.
Le mode de réalisation illustré aux figures 4 et 5 sur lesquelles les éléments identiques portent les mêmes références diffère du premier mode de réalisation en ce que la douille 16 comporte, au voisinage de la surface frontale radiale 16b, une portion filetée 52 annulaire s ' étendant radialement vers l' intérieur et coopérant avec la portion filetée 18c de la vis de fixation 18 de manière à permettre la retenue axiale de la vis à l' intérieur de la douille 16. On pourrait remplacer, à titre de variante, cette portion filetéeThe embodiment illustrated in FIGS. 4 and 5 in which the identical elements bear the same references differs from the first embodiment in that the bushing 16 comprises, at adjacent the radial front surface 16b, an annular threaded portion 52 extending radially inwardly and cooperating with the threaded portion 18c of the fastening screw 18 so as to allow axial retention of the screw within the socket 16. This threaded portion could alternatively be replaced
52 par un ou plusieurs ergots en saillie radiale vers l' intérieur.52 by one or more pins radially projecting inwardly.
Le mode de réalisation illustré à la figure 6 sur laquelle les éléments identiques portent les mêmes références diffère du premier mode de réalisation en ce que la douille 16 présente une dimension axiale égale à la bague intérieure 30. Les surfaces radiales frontalesThe embodiment illustrated in FIG. 6 in which the identical elements bear the same references differs from the first embodiment in that the bushing 16 has an axial dimension equal to the inner ring 30. The radial front surfaces
16b et 16c sont respectivement alignées ou affleurent avec les surfaces frontales 30c et 3Od de la bague intérieure 30. La douille 16 laisse toutefois libre lesdites surfaces radiales frontales 30c et 30d. Dans ce mode de réalisation, le galet 10 est dépourvu de rondelle d' appui pour la tête 18a de la vis, ladite tête venant directement en appui contre la surface frontale 16c de la douille 16.16b and 16c are respectively aligned or flush with the front surfaces 30c and 30d of the inner ring 30. The sleeve 16 however leaves free said frontal radial surfaces 30c and 30d. In this embodiment, the roller 10 has no bearing washer for the head 18a of the screw, said head coming directly against the front surface 16c of the sleeve 16.
Le mode de réalisation illustré à la figure 7 sur laquelle les éléments identiques portent les mêmes références diffère du premier mode de réalisation en ce que la douille 16 présente une longueur axiale accrue, et vient en saillie axiale par rapport à la surface frontaleThe embodiment illustrated in FIG. 7, in which the identical elements bear the same references differs from the first embodiment in that the bushing 16 has an increased axial length, and projects axially with respect to the front surface.
30c de la bague intérieure 30. La douille 16 laisse toutefois libre ladite surface frontale radiale. Elle comporte une entretoise 54 annulaire venant en appui contre ladite surface 30c de la bague intérieure 30. L ' entretoise 54, avantageusement réalisée en matière métallique, est surmoulée sur la surface extérieure 16a de la douille 16. Elle est avantageusement disposée dans le moule de fabrication du galet 10 en même temps que le roulement 14, le surmoulage de la poulie 12, et de la douille 16 permettant d' obtenir un ensemble roulement-douille- entretoise indémontable. Le mode de réalisation illustré à la figure 8 sur laquelle les éléments identiques portent les mêmes références diffère du premier mode de réalisation en ce que la douille 16 comporte, à chaque extrémité axiale de l' alésage 16d, deux portions 56, 58 de diamètre accru. On dispose pour la douille 16 d'un alésage 16d étage. Le galet30c of the inner ring 30. The sleeve 16, however, leaves free said radial front surface. It comprises an annular spacer 54 bearing against said surface 30c of the inner ring 30. The spacer 54, advantageously made of metallic material, is overmolded on the outer surface 16a of the sleeve 16. It is advantageously arranged in the mold of manufacture of the roller 10 at the same time as the bearing 14, the overmoulding of the pulley 12, and the sleeve 16 to obtain a bearing-sleeve-spacer unit indémontable. The embodiment illustrated in FIG. 8 on which the identical elements bear the same references differs from the first embodiment in that the bushing 16 comprises, at each axial end of the bore 16d, two portions 56, 58 of increased diameter. . For the sleeve 16, a 16d bore is provided. The stone
10 comporte également un flasque 60 de protection avantageusement réalisé en tôle métallique et se présentant sous la forme d'une coupelle de forme générale annulaire. Le flasque 60 comporte une portion axiale 60a annulaire emmanchée à l' intérieur de la portion 58 de diamètre agrandi de l' alésage 16b qui permet le passage de la vis de fixation (non représentée). Ladite vis peut être montée avec un léger jeu de serrage dans la portion 60a de façon à assurer la retenue de l' ensemble. La portion axiale 60 est prolongée radialement vers l' extérieur à une extrémité libre par une portion radiale 60b venant en appui contre la surface frontale 30c de la bague intérieure 30 et s 'étendant jusqu' au voisinage de la portion intérieure 24 de la poulie 12. La portion radiale 60b est prolongée axialement, à son bord de grand diamètre en direction de la poulie 12, par une portion axiale 60c située radialement au voisinage immédiat de la portion intérieure 24 et formant ainsi une étanchéité par passage étroit.10 also comprises a protective flange 60 advantageously made of sheet metal and being in the form of a cup of generally annular shape. The flange 60 comprises an annular axial portion 60a fitted inside the portion 58 of enlarged diameter of the bore 16b which allows the passage of the fastening screw (not shown). Said screw can be mounted with a slight tightening clearance in the portion 60a so as to ensure the retention of the assembly. The axial portion 60 is extended radially outwardly at a free end by a radial portion 60b bearing against the front surface 30c of the inner ring 30 and extending to the vicinity of the inner portion 24 of the pulley 12 The radial portion 60b is extended axially, at its large-diameter edge in the direction of the pulley 12, by an axial portion 60c located radially in the immediate vicinity of the inner portion 24 and thus forming a tight passage seal.
Le mode de réalisation illustré aux figures 9 à 1 1 sur lesquelles les éléments identiques portent les mêmes références diffère du premier mode de réalisation en ce que le galet 10 comporte une douille 62 excentrique, d' axe 64 décalé radialement par rapport à l' axe 20 du roulement 14. La douille 62 excentrique comporte une surface extérieure 62a cylindrique en contact avec l' alésage 30b de la bague intérieure 30, deux surfaces radiales frontales latérales 62b et 62c, et un alésage 62d traversant pour le montage de la vis 18. La surface radiale 62b est en retrait par rapport à la surface frontale 30c de la bague intérieure 30. La douille 62 est surmoulée dans l' alésage 30b de la bague intérieure 30.The embodiment illustrated in FIGS. 9 to 11, in which the identical elements bear the same references, differs from the first embodiment in that the roller 10 comprises an eccentric bushing 62 of axis 64 offset radially with respect to the axis. The eccentric bushing 62 has a cylindrical outer surface 62a in contact with the bore 30b of the inner race 30, two lateral radial end faces 62b and 62c, and a through bore 62d for mounting the screw 18. The radial surface 62b is set back from the front surface 30c of the inner ring 30. The sleeve 62 is overmolded in the bore 30b of the inner ring 30.
La douille 62 excentrique comporte, à une extrémité axiale, une collerette 66 radiale comprenant la surface radiale 62c et venant en appui contre la surface radiale 30d de la bague intérieure 30. La têteThe eccentric bushing 62 comprises, at one axial end, a radial flange 66 comprising the radial surface 62c and bearing against the radial surface 30d of the inner ring 30. The head
18a de la vis 18 est en appui contre la surface radiale 62c axialement du côté opposé à la bague 30 intérieure. La collerette 66 présente une forme générale hexagonale de manière à permettre, à l' aide d'une clé en correspondance de forme, un réglage manuel de la position angulaire de la douille 62 excentrique et donc de la tension de la courroie ou de la chaîne. Bien entendu, ce réglage s ' effectue avant le serrage de la vis 18 de fixation.18a of the screw 18 bears against the radial surface 62c axially on the opposite side to the inner ring 30. The flange 66 has a generally hexagonal shape so as to allow, by means of a key corresponding to shape, a manual adjustment of the angular position of the eccentric bushing 62 and therefore of the tension of the belt or of the chain . Of course, this adjustment is made before tightening the screw 18 fixing.
Le mode de réalisation illustré aux figures 12 et 13 diffère du mode de réalisation précédemment décrit en ce que la collerette 66 radiale est de forme générale cylindrique et comporte deux évidementsThe embodiment illustrated in FIGS. 12 and 13 differs from the embodiment previously described in that the radial flange 66 is generally cylindrical in shape and comprises two recesses.
68 cylindriques traversants de manière à permettre le réglage de la tension de la courroie ou de la chaîne à l'aide d'une clé à griffes.68 cylindrical through to allow the adjustment of the tension of the belt or chain with a claw key.
Dans les modes de réalisation illustrés sur les figures 6 à 13 , la douille 16 est également prévue avec une tolérance permettant d' obtenir un ajustement serré entre celle-ci et la vis 18 de fixation qui soit suffisant pour assurer la retenue axiale de ladite vis.In the embodiments illustrated in Figures 6 to 13, the sleeve 16 is also provided with a tolerance to obtain a tight fit between the latter and the fixing screw 18 which is sufficient to ensure the axial retention of said screw .
Grâce à l'invention, on réalise ainsi de façon économique des dispositifs de galets pouvant s 'adapter à différents diamètres de vis tout en utilisant des roulements identiques. En effet, l' adaptation de l' alésage de la poulie par rapport au diamètre de la vis se fait par l' intermédiaire de la douille réalisée en matière plastique. Par ailleurs, la douille assure la retenue axiale de la vis de fixation ou encore d' autres éléments tels qu'une entretoise ou un flasque de protection, prévus pour venir en appui contre une des bagues du roulement. Thanks to the invention, it is thus economical to produce roller devices that can be adapted to different screw diameters while using identical bearings. Indeed, the adaptation of the bore of the pulley with respect to the diameter of the screw is done through the bushing made of plastic material. Furthermore, the sleeve provides axial retention of the fastening screw or other elements such as a spacer or a protective flange, provided to bear against one of the bearing rings.

Claims

REVENDICATIONS
1 -Dispositif de galet tendeur ou enrouleur de courroie ou de chaîne pourvu d'un roulement ( 14) comprenant une bague intérieure (30), une bague extérieure (32) et au moins une rangée d'éléments roulants (34) montés entre les bagues, d'une poulie ( 12) surmoulée sur la bague extérieure et d'une vis ( 18) de fixation immobilisée axialement par rapport au roulement, caractérisé en ce qu' il comprend une douille ( 16 ; 62) surmoulée dans l' alésage de la bague intérieure et munie d'un alésage ( 16d ; 62d) traversant pour le montage de la vis ( 18) de fixation, ladite douille étant pourvue de moyens de retenue axiale de la vis ( 18) de fixation à l' intérieur de l' alésage traversant de la douille ( 16).1 -Tensioner roller device or belt or chain winder provided with a bearing (14) comprising an inner ring (30), an outer ring (32) and at least one row of rolling elements (34) mounted between the rings, a pulley (12) overmolded on the outer ring and a fixing screw (18) immobilized axially relative to the bearing, characterized in that it comprises a bushing (16; 62) molded into the bore of the inner ring and provided with a bore (16d; 62d) therethrough for mounting the fastening screw (18), said sleeve being provided with axial retaining means of the fastening screw (18) inside the the bore through the bushing (16).
2-Dispositif selon la revendication 1 , dans lequel la vis ( 18) de fixation est en contact direct avec l' alésage ( 16d ; 62d) traversant. 3-Dispositif selon la revendication 1 ou 2, dans lequel les moyens de retenue axiale comportent une portion filetée (50) apte à coopérer avec une portion filetée de la vis ( 18) de fixation.2-Device according to claim 1, wherein the fastening screw (18) is in direct contact with the bore (16d; 62d) therethrough. 3-Device according to claim 1 or 2, wherein the axial retention means comprise a threaded portion (50) adapted to cooperate with a threaded portion of the screw (18) of attachment.
4-Dispositif selon l'une quelconque des revendications précédentes, dans lequel le diamètre extérieur de la douille ( 16) est inférieur au diamètre intérieur d'une surface radiale frontale (30d) de la bague intérieure.4-Device according to any one of the preceding claims, wherein the outer diameter of the sleeve (16) is smaller than the inner diameter of a front radial surface (30d) of the inner ring.
5-Dispositif selon l'une quelconque des revendications précédentes, dans lequel des surfaces radiales frontales ( 16b, 16c) de la douille sont en retrait ou affleurent avec des surfaces radiales frontales (30c, 30d) de la bague intérieure (30).5-Device according to any one of the preceding claims, wherein the radial radial surfaces (16b, 16c) of the sleeve are recessed or flush with frontal radial surfaces (30c, 30d) of the inner ring (30).
6-Dispositif selon l'une quelconque des revendications 1 à 4, dans lequel la douille ( 16) comporte, à une extrémité axiale, une entretoise (54) venant axialement en appui contre la bague intérieure (30). 7-Dispositif selon l'une quelconque des revendications précédentes, dans lequel la douille (62) est une douille excentrique.6-Device according to any one of claims 1 to 4, wherein the sleeve (16) comprises, at one axial end, a spacer (54) axially bearing against the inner ring (30). 7-Device according to any one of the preceding claims, wherein the sleeve (62) is an eccentric bushing.
8-Dispositif selon l'une quelconque des revendications précédentes, comprenant un flasque de protection (60) monté sur la douille ( 16).8-Device according to any one of the preceding claims, comprising a protective flange (60) mounted on the sleeve (16).
9-Dispositif selon la revendication 8, dans lequel le flasque de protection (60) comporte une portion axiale (62) tubulaire emmanchée dans une portion de grand diamètre de l' alésage traversant ( 16b) de la douille. 10-Dispositif selon la revendication 8 ou 9, dans lequel le flasque de protection (60) est monté en appui contre une surface radiale frontale (30c) de la bague intérieure (30).9-Device according to claim 8, wherein the protective flange (60) comprises a tubular axial portion (62) fitted in a large diameter portion of the through bore (16b) of the sleeve. 10-Device according to claim 8 or 9, wherein the protective flange (60) is mounted in abutment against a front radial surface (30c) of the inner ring (30).
1 1 -Dispositif selon l'une quelconque des revendications précédentes, dans lequel la poulie ( 12) et la douille (16) sont réalisées à partir d'une même matière synthétique. 1 1 -Dispositif according to any one of the preceding claims, wherein the pulley (12) and the sleeve (16) are made from the same synthetic material.
EP08848247A 2007-11-06 2008-10-22 Tensioning roller or winder device Withdrawn EP2217423A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0758818A FR2923281B1 (en) 2007-11-06 2007-11-06 ROLLER OR ROLLER DEVICE
PCT/FR2008/051906 WO2009060150A1 (en) 2007-11-06 2008-10-22 Tensioning roller or winder device

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EP2217423A1 true EP2217423A1 (en) 2010-08-18

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US (2) US20110009220A1 (en)
EP (1) EP2217423A1 (en)
CN (1) CN101888922B (en)
FR (1) FR2923281B1 (en)
WO (1) WO2009060150A1 (en)

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Publication number Publication date
CN101888922A (en) 2010-11-17
CN101888922B (en) 2014-02-12
FR2923281A1 (en) 2009-05-08
FR2923281B1 (en) 2010-04-09
WO2009060150A1 (en) 2009-05-14
US20110009220A1 (en) 2011-01-13
US20150176641A1 (en) 2015-06-25
US9702399B2 (en) 2017-07-11

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