EP2417371A1 - Roller for a rolling bearing - Google Patents
Roller for a rolling bearingInfo
- Publication number
- EP2417371A1 EP2417371A1 EP10717184A EP10717184A EP2417371A1 EP 2417371 A1 EP2417371 A1 EP 2417371A1 EP 10717184 A EP10717184 A EP 10717184A EP 10717184 A EP10717184 A EP 10717184A EP 2417371 A1 EP2417371 A1 EP 2417371A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roller
- diameter
- rolling bearing
- symmetry
- bearing according
- 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- Withdrawn
Links
Classifications
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- 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
- F16C33/30—Parts of ball or roller bearings
- F16C33/34—Rollers; Needles
- F16C33/36—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces
- F16C33/363—Rollers; Needles with bearing-surfaces other than cylindrical, e.g. tapered; with grooves in the bearing surfaces with grooves in the bearing-surfaces
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- 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
- F16C23/06—Ball or roller bearings
- F16C23/08—Ball or roller bearings self-adjusting
- F16C23/082—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface
- F16C23/086—Ball or roller bearings self-adjusting by means of at least one substantially spherical surface forming a track for rolling elements
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- 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
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
- F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
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- 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
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
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- 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
- F16C2361/61—Toothed gear systems, e.g. support of pinion shafts
Definitions
- the invention relates to a roller for a rolling bearing and a rolling bearing in which such rollers are mounted.
- the invention applies in particular to rollers for an epicyclic gear bearing, in particular a planet bearing of an epicyclic reduction gearbox for a helicopter gearbox.
- rollers in particular of spherical barrel geometry.
- Each roll has an outer surface of revolution about an axis of symmetry and a side face disposed on each side of said outer surface.
- These rollers are intended to be mounted in the bearing by being arranged in a retention cage so as to be able to rotate in said bearing around their axis of symmetry while bearing on their outer surface.
- the lateral faces of the rollers may have a recess in which an axial projection of the cage is engaged so as to keep each of said rollers rotating about their axis of symmetry.
- the satellite bearings according to the prior art have a significant weight, which is even more critical for an aeronautical application in which five to ten bearings are conventionally embedded in a planetary reducer equipping a gearbox.
- the object of the invention is to improve the prior art by notably proposing rollers for rolling bearings which have a reduced mass while satisfying the functional requirements of the bearing, in particular with respect to the structural fatigue of said rollers under the effect of the cycles of loads that they undergo in time.
- the invention proposes a roller for rolling bearing, said roller having an outer surface of revolution about an axis of symmetry and a lateral face disposed on each side of said outer surface, said roller being adapted to rotate in said bearing about its axis of symmetry while resting on its outer surface, said roller having two recesses which are respectively formed on a lateral face extending along the axis of symmetry, said recesses having an opening diameter di measured on the side face and being axially separated by a material bridge of length e, said opening diameter and said length of the material bridge fulfilling the following geometrical condition: 0.1 ⁇ - ⁇ 1. d ⁇
- the invention proposes a rolling bearing comprising an inner member and an outer member between which are mounted such rollers, said rollers being arranged in a retention cage so as to be rotatable about their axis of symmetry. being supported on said members via their outer surface.
- FIG. 1 shows in perspective cutaway a rolling bearing according to one embodiment of the invention
- Figures 2 show a roller according to one embodiment of the invention, respectively in longitudinal section ( Figures 2a and 2c) and a top view showing the contact ellipse ( Figure 2b).
- a rolling bearing in the form of an epicyclic reduction gearbox bearing for a helicopter gearbox is described below.
- the epicyclic gear is an effective mechanical principle for transmitting power and reducing speed in a small footprint.
- the mass of the bearings This mechanical assembly is important (bearings in large numbers: generally between five and ten).
- the bearing comprises an inner ring 1 and an outer ring 2.
- the outer surface of the outer ring 2 is provided with a gear means formed of axial teeth 3.
- a rolling bearing according to the invention may find application in another field in which in particular a weight gain of said bearing is desirable.
- the rings 1, 2 each comprise a raceway between which is arranged a row of rollers 4 so as to allow the relative rotation of said rings.
- rollers 4 which each have an outer surface 5 of revolution about an axis of symmetry A and a lateral face 6 disposed on each side of said outer surface, is described below.
- the rollers 4 may be made of metal material, especially rolled steel type 100Cr6.
- the rollers 4 are intended to rotate about their axis of symmetry A during the rotation of said bearing, said rollers bearing on the rolling tracks via their outer surface 5. Moreover, when the rotation, the side faces 6 are guided along a shoulder or the retention cage 7 so as to maintain the rollers 4 in the bearing.
- the outer surface 5 has a barrel spherical geometry of radius R (commonly called barrel roll) in which the diameter d of side faces 6 is smaller than the central diameter D of said outer surface.
- the lateral faces 6 extend respectively in a plane transverse to the axis of symmetry A, the diameters d being measured in the transverse planes and said planes being spaced from a length L corresponding to that of the roller 4.
- the roller 4 may have a cylindrical or conical geometry.
- the invention proposes a relief of the rollers 4 that it incorporates.
- the rollers 4 have two recesses 8 which are made, in particular by drilling, turning or milling, respectively on a lateral face 6 extending along the axis of symmetry A.
- the recesses 8 have an opening diameter di measured on the side face 6 and are separated axially by a material bridge 9 of length e.
- the rollers 4 are subjected to structural fatigue as a result of the load cycles they undergo over time.
- the invention proposes to reduce the amount of material of the rollers 4 in the less mechanically stressed areas and to keep it elsewhere.
- the opening diameter di and the length e of the material bridge 9 can fulfill the following geometrical condition: 0.1 ⁇ - ⁇ 1.
- the recesses 8 are d ⁇ arranged to maintain a sufficient wall thickness to mechanically withstand the stresses experienced during the rotation of the bearing.
- the length e of the material bridge 9 is determined according to the application to be sufficient to be certain, with the safety margins in force in said application, not to risk a fatigue failure of a roller 4 in the bearing.
- each recess 8 has a convergent frustoconical geometry having a bottom diameter d 2 on the junction zone with the diameter bridge 9, said bottom diameter being smaller than the opening diameter di .
- the maximum diameter D of the outer surface 5 is disposed in the center of said surface, around the material bridge 9.
- the contact zone (called Hertz) between a roller 4 and the rolling tracks is positioned at right of the center of the roll 4, that is to say the right of the material bridge 9, the Hertz stress depth being directly related to the level of contact pressure between the roller 4 and the tracks.
- the contact zone has an elliptical shape 10 (FIG. 2b) which has a large length L e .
- each recess 8 may have a diameter d e measured at a quarter of the great length L e of the contact ellipse 10 of which is such that e ⁇ D ⁇ •
- the thickness diametral Dd e of the material around the material bridge 9, that is to say the depth of material left in this area, is greater than W, so as to be sufficient to ensure the structural strength of the rollers 4 in fatigue.
- the junction zone between the recesses 8 and the material bridge 9 has a connection radius r, said connection radius r being in particular greater than 0.1 mm.
- the recesses 8 extend over a depth P defined between diameters di and d 2 , the connection radius r being formed from said bottom diameter d 2 .
- said rollers are arranged in a retention cage 7 so as to be rotatable about their axis of symmetry A while bearing on the members 1 , 2 through their outer surface 5.
- the cage 7 is formed in one piece, in particular by machining a metallic material, to comprise a first ring and, offset axially, a second ring, said rings having the same diameter.
- the cage further comprises a plurality of axial crosspieces which extend between said crowns so as to form between two adjacent crosspieces and the crowns a retention housing of a roller 4.
- the internal geometry of the housing is formed to fit the periphery of the roll 4 allowing its rotation about its axis of symmetry A.
- each lateral face of a roll 4 is disposed facing respectively a side face of a housing, a hooking means of said roller being formed on each side face of said housing.
- the hooking means comprises an axial projection engaged in a recess 8 of the roll 4 so as to keep said roll in said housing in rotation.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention relates to a roller (4) for a rolling bearing, said roller having an outer surface (5) of revolution about an axis of symmetry (A) and a lateral face (6) arranged on each side of said outer surface, said roller being intended to turn in said bearing about its axis of symmetry (A) while bearing on its outer surface (5), said roller having two recesses (8) which are each produced in one lateral face (6) and extend along the axis of symmetry (A), said recesses having an opening diameter (di) measured on the lateral face (6) and being separated axially by a bridge of material (9) of length (e), said opening diameter and said length of the bridge of material (9) fulfilling the following geometric condition: 0.1 = e/d1 = 1.
Description
Rouleau pour palier à roulement Roller for rolling bearing
L'invention concerne un rouleau pour un palier à roulement ainsi qu'un palier à roulement dans lequel sont montés de tels rouleaux.The invention relates to a roller for a rolling bearing and a rolling bearing in which such rollers are mounted.
L'invention s'applique en particulier à des rouleaux pour un palier de train épicycloïdal, notamment un roulement satellite de réducteur épicycloïdal pour boîte de transmission d'hélicoptère.The invention applies in particular to rollers for an epicyclic gear bearing, in particular a planet bearing of an epicyclic reduction gearbox for a helicopter gearbox.
Dans cette application, il est connu d'utiliser des rouleaux pleins, notamment de géométrie sphérique en tonneau. Chaque rouleau présente une surface extérieure de révolution autour d'un axe de symétrie et une face latérale disposée de chaque côté de ladite surface extérieure. Ces rouleaux sont destinés à être montés dans le palier en étant disposés dans une cage de rétention de sorte à pouvoir tourner dans ledit palier autour de leur axe de symétrie en étant en appui sur leur surface extérieure.In this application, it is known to use solid rollers, in particular of spherical barrel geometry. Each roll has an outer surface of revolution about an axis of symmetry and a side face disposed on each side of said outer surface. These rollers are intended to be mounted in the bearing by being arranged in a retention cage so as to be able to rotate in said bearing around their axis of symmetry while bearing on their outer surface.
Pour ce faire, les faces latérales des rouleaux peuvent présenter un renfoncement dans lequel une saillie axiale de la cage est engagée de sorte à maintenir en rotation chacun desdits rouleaux autour de leur axe de symétrie.To do this, the lateral faces of the rollers may have a recess in which an axial projection of the cage is engaged so as to keep each of said rollers rotating about their axis of symmetry.
Toutefois, les roulements satellites selon l'art antérieur présentent un poids important, qui est d'autant plus critique pour une application aéronautique dans laquelle de cinq à dix roulements sont classiquement embarqués dans un réducteur épicycloïdal équipant une boîte de transmission.However, the satellite bearings according to the prior art have a significant weight, which is even more critical for an aeronautical application in which five to ten bearings are conventionally embedded in a planetary reducer equipping a gearbox.
L'invention a pour but de perfectionner l'art antérieur en proposant notamment des rouleaux pour palier à roulement qui présentent une masse réduite tout en répondant aux exigences fonctionnelles du palier, notamment relativement à la fatigue structurale desdits rouleaux sous l'effet des cycles de charges qu'ils subissent dans le temps.
A cet effet, et selon un premier aspect, l'invention propose un rouleau pour palier à roulement, ledit rouleau présentant une surface extérieure de révolution autour d'un axe de symétrie et une face latérale disposée de chaque côté de ladite surface extérieure, ledit rouleau étant destiné à tourner dans ledit palier autour de son axe de symétrie en étant en appui sur sa surface extérieure, ledit rouleau présentant deux évidements qui sont réalisés respectivement sur une face latérale en s'étendant suivant l'axe de symétrie, lesdits évidements présentant un diamètre d'ouverture di mesuré sur la face latérale et étant séparés axialement par un pont de matière de longueur e, ledit diamètre d'ouverture et ladite longueur du pont de matière remplissant la condition géométrique suivante : 0,1 < — < 1. d\The object of the invention is to improve the prior art by notably proposing rollers for rolling bearings which have a reduced mass while satisfying the functional requirements of the bearing, in particular with respect to the structural fatigue of said rollers under the effect of the cycles of loads that they undergo in time. For this purpose, and according to a first aspect, the invention proposes a roller for rolling bearing, said roller having an outer surface of revolution about an axis of symmetry and a lateral face disposed on each side of said outer surface, said roller being adapted to rotate in said bearing about its axis of symmetry while resting on its outer surface, said roller having two recesses which are respectively formed on a lateral face extending along the axis of symmetry, said recesses having an opening diameter di measured on the side face and being axially separated by a material bridge of length e, said opening diameter and said length of the material bridge fulfilling the following geometrical condition: 0.1 <- <1. d \
Selon un deuxième aspect, l'invention propose un palier à roulement comprenant un organe intérieur et un organe extérieur entre lesquels sont montés de tels rouleaux, lesdits rouleaux étant disposés dans une cage de rétention de sorte à pouvoir tourner autour de leur axe de symétrie en étant en appui sur lesdits organes par l'intermédiaire de leur surface extérieure.According to a second aspect, the invention proposes a rolling bearing comprising an inner member and an outer member between which are mounted such rollers, said rollers being arranged in a retention cage so as to be rotatable about their axis of symmetry. being supported on said members via their outer surface.
D'autres objets et avantages de l'invention apparaîtront dans la description qui suit, faite en référence aux figures jointes dans lesquelles :Other objects and advantages of the invention will appear in the description which follows, made with reference to the appended figures in which:
- la figure 1 montre en perspective écorchée un palier à roulement selon un mode de réalisation de l'invention ;- Figure 1 shows in perspective cutaway a rolling bearing according to one embodiment of the invention;
- les figures 2 montrent un rouleau selon un mode de réalisation de l'invention, respectivement en coupe longitudinale (figures 2a et 2c) et en vue de dessus montrant l'ellipse de contact (figure 2b).- Figures 2 show a roller according to one embodiment of the invention, respectively in longitudinal section (Figures 2a and 2c) and a top view showing the contact ellipse (Figure 2b).
En relation avec la figure 1 , on décrit ci-dessous un mode de réalisation d'un palier à roulement sous la forme d'un roulement satellite de réducteur épicycloïdal pour une boîte de transmission d'hélicoptère. Le train épicycloïdal est un principe mécanique efficace pour transmettre de la puissance et réduire la vitesse dans un encombrement réduit. Toutefois, la masse des roulements
de cet ensemble mécanique est importante (roulements en nombre important : en général entre cinq et dix).In relation to FIG. 1, an embodiment of a rolling bearing in the form of an epicyclic reduction gearbox bearing for a helicopter gearbox is described below. The epicyclic gear is an effective mechanical principle for transmitting power and reducing speed in a small footprint. However, the mass of the bearings This mechanical assembly is important (bearings in large numbers: generally between five and ten).
Le roulement comprend une bague intérieure 1 et une bague extérieure 2. Pour cette application, la surface extérieure de la bague extérieure 2 est pourvue d'un moyen d'engrenage formé de dentures axiales 3. En variante non représentée, un palier à roulement selon l'invention peut trouver son application dans un autre domaine dans lequel notamment un gain de poids dudit palier est souhaitable.The bearing comprises an inner ring 1 and an outer ring 2. For this application, the outer surface of the outer ring 2 is provided with a gear means formed of axial teeth 3. In a variant that is not shown, a rolling bearing according to the invention may find application in another field in which in particular a weight gain of said bearing is desirable.
Les bagues 1 , 2 comprennent chacune une piste de roulement entre lesquelles est disposée une rangée de rouleaux 4 de sorte à permettre la rotation relative desdites bagues.The rings 1, 2 each comprise a raceway between which is arranged a row of rollers 4 so as to allow the relative rotation of said rings.
En relation avec les figures 2, on décrit ci-dessous un mode de réalisation des rouleaux 4 qui présentent chacun une surface extérieure 5 de révolution autour d'un axe de symétrie A et une face latérale 6 disposée de chaque côté de ladite surface extérieure. Compte tenu de la puissance à transmettre et du rapport de réduction important, les rouleaux 4 peuvent être réalisés en matériau métallique, notamment en acier à roulement de type 100Cr6.In relation to FIG. 2, an embodiment of the rollers 4, which each have an outer surface 5 of revolution about an axis of symmetry A and a lateral face 6 disposed on each side of said outer surface, is described below. Given the power to be transmitted and the significant reduction ratio, the rollers 4 may be made of metal material, especially rolled steel type 100Cr6.
Dans le palier, les rouleaux 4 sont destinés à tourner autour de leur axe de symétrie A lors de la rotation dudit palier, lesdits rouleaux étant en appui sur les pistes de roulement par l'intermédiaire de leur surface extérieure 5. Par ailleurs, lors de la rotation, les faces latérales 6 sont guidées le long d'un épaulement ou de la cage de rétention 7 de sorte à maintenir les rouleaux 4 dans le palier.In the bearing, the rollers 4 are intended to rotate about their axis of symmetry A during the rotation of said bearing, said rollers bearing on the rolling tracks via their outer surface 5. Moreover, when the rotation, the side faces 6 are guided along a shoulder or the retention cage 7 so as to maintain the rollers 4 in the bearing.
Dans la réalisation représentée, la surface extérieure 5 présente une géométrie sphérique en tonneau de rayon R (couramment appelé rouleau tonneau) dans laquelle le diamètre d des faces latérales 6 est inférieur au diamètre central D de ladite surface extérieure. En outre, les faces latérales 6 s'étendent respectivement dans un plan transversal par rapport à l'axe de symétrie A, les diamètres d étant mesurés dans les plans transversaux et lesdits plans étant
espacés d'une longueur L correspondant à celle du rouleau 4. En variante non représentée, le rouleau 4 peut présenter une géométrie cylindrique ou conique.In the embodiment shown, the outer surface 5 has a barrel spherical geometry of radius R (commonly called barrel roll) in which the diameter d of side faces 6 is smaller than the central diameter D of said outer surface. In addition, the lateral faces 6 extend respectively in a plane transverse to the axis of symmetry A, the diameters d being measured in the transverse planes and said planes being spaced from a length L corresponding to that of the roller 4. Alternatively not shown, the roller 4 may have a cylindrical or conical geometry.
Pour obtenir un gain de poids dans le palier, l'invention propose un allégement des rouleaux 4 qu'il intègre. Pour ce faire, les rouleaux 4 présentent deux évidements 8 qui sont réalisés, notamment par perçage, tournage ou fraisage, respectivement sur une face latérale 6 en s'étendant suivant l'axe de symétrie A. Les évidements 8 présentent un diamètre d'ouverture di mesuré sur la face latérale 6 et sont séparés axialement par un pont de matière 9 de longueur e.To obtain a weight saving in the bearing, the invention proposes a relief of the rollers 4 that it incorporates. To do this, the rollers 4 have two recesses 8 which are made, in particular by drilling, turning or milling, respectively on a lateral face 6 extending along the axis of symmetry A. The recesses 8 have an opening diameter di measured on the side face 6 and are separated axially by a material bridge 9 of length e.
Toutefois, les rouleaux 4 sont soumis à une fatigue structurale sous l'effet des cycles de charges qu'ils subissent dans le temps. Afin de satisfaire aux exigences fonctionnelles du palier, notamment relativement à cette fatigue, tout en diminuant le poids, l'invention propose de réduire la quantité de matière des rouleaux 4 dans les zones les moins sollicitées mécaniquement et de la conserver ailleurs.However, the rollers 4 are subjected to structural fatigue as a result of the load cycles they undergo over time. In order to meet the functional requirements of the bearing, particularly with respect to this fatigue, while decreasing the weight, the invention proposes to reduce the amount of material of the rollers 4 in the less mechanically stressed areas and to keep it elsewhere.
Pour ce faire, selon une première caractéristique avantageuse de l'invention, le diamètre d'ouverture di et la longueur e du pont de matière 9 peuvent remplir la condition géométrique suivante : 0,1 < — < 1. Ainsi, les évidements 8 sont d\ agencés pour conserver une épaisseur de paroi suffisante pour résister mécaniquement aux sollicitations subies lors de la rotation du palier.To do this, according to a first advantageous characteristic of the invention, the opening diameter di and the length e of the material bridge 9 can fulfill the following geometrical condition: 0.1 <- <1. Thus, the recesses 8 are d \ arranged to maintain a sufficient wall thickness to mechanically withstand the stresses experienced during the rotation of the bearing.
En particulier, la longueur e du pont de matière 9 est déterminée en fonction de l'application afin d'être suffisante pour être certain, avec les marges de sécurité en vigueur dans ladite application, de ne pas risquer une rupture par fatigue d'un rouleau 4 dans le palier.In particular, the length e of the material bridge 9 is determined according to the application to be sufficient to be certain, with the safety margins in force in said application, not to risk a fatigue failure of a roller 4 in the bearing.
En outre, pour fiabiliser le guidage sur les faces latérales 6, le diamètre d'ouverture di peut être tel que d -dλ ≥ lmm , de sorte à maintenir une longueur de guidage suffisante du rouleau 4 dans le palier.
Selon une autre caractéristique avantageuse de l'invention, chaque évidement 8 présente une géométrie tronconique convergente en présentant un diamètre de fond d2 sur la zone de jonction avec le pont de diamètre 9, ledit diamètre de fond étant inférieur au diamètre d'ouverture di. Ainsi, un maximum de matière peut être maintenu dans la zone centrale du rouleau 4 qui est la plus sollicitée par le contact entre la surface extérieure 5 et les pistes de roulement.In addition, to make reliable guiding on the side faces 6, the opening diameter di may be such that d -d λ ≥ lmm, so as to maintain a sufficient guide length of the roller 4 in the bearing. According to another advantageous characteristic of the invention, each recess 8 has a convergent frustoconical geometry having a bottom diameter d 2 on the junction zone with the diameter bridge 9, said bottom diameter being smaller than the opening diameter di . Thus, a maximum of material can be maintained in the central zone of the roll 4 which is the most stressed by the contact between the outer surface 5 and the raceways.
En effet, le diamètre maximal D de la surface extérieure 5 est disposé au centre de ladite surface, autour du pont de matière 9. Ainsi, la zone de contact (dite de Hertz) entre un rouleau 4 et les pistes de roulement est positionnée au droit du centre du rouleau 4, c'est-à-dire au droit du pont de matière 9, la profondeur des contraintes de Hertz étant directement liée au niveau de pression de contact entre le rouleau 4 et les pistes.Indeed, the maximum diameter D of the outer surface 5 is disposed in the center of said surface, around the material bridge 9. Thus, the contact zone (called Hertz) between a roller 4 and the rolling tracks is positioned at right of the center of the roll 4, that is to say the right of the material bridge 9, the Hertz stress depth being directly related to the level of contact pressure between the roller 4 and the tracks.
Dans le mode de réalisation représenté, la zone de contact présente une forme d'ellipse 10 (figure 2b) qui présente une grande longueur Le. Pour optimiser la résistance mécanique des rouleaux 4, chaque évidement 8 peut présenter un diamètre de mesuré au quart de la grande longueur Le de l'ellipse de contact 10 qui est tel que de < ^DÂ • Ainsi, l'épaisseur diamétrale D-de de la matière autour du pont de matière 9, c'est-à-dire la profondeur de matière laissée dans cette zone, est supérieure à W , de sorte à être suffisante pour assurer la résistance structurale des rouleaux 4 en fatigue.In the embodiment shown, the contact zone has an elliptical shape 10 (FIG. 2b) which has a large length L e . To optimize the mechanical strength of the rollers 4, each recess 8 may have a diameter d e measured at a quarter of the great length L e of the contact ellipse 10 of which is such that e <^ D Â • Thus, the thickness diametral Dd e of the material around the material bridge 9, that is to say the depth of material left in this area, is greater than W, so as to be sufficient to ensure the structural strength of the rollers 4 in fatigue.
Selon une autre caractéristique avantageuse de l'invention, la zone de jonction entre les évidements 8 et le pont de matière 9 présente un rayon de raccordement r, ledit rayon de raccordement r étant notamment supérieur à 0,1 mm. Ainsi, sur la zone la plus sollicitée des rouleaux 4, on élimine tout risque de surcontrainte locale due à des angles vifs ou des raccordements de surfaces non maîtrisées. En particulier, les évidements 8 s'étendent sur une profondeur P définie entre les diamètres di et d2, le rayon de raccordement r étant formé depuis ledit diamètre de fond d2.
Pour permettre la rétention des rouleaux 4 dans l'espace de roulement lors de la rotation du palier, lesdits rouleaux sont disposés dans une cage de rétention 7 de sorte à pouvoir tourner autour de leur axe de symétrie A en étant en appui sur les organes 1 , 2 par l'intermédiaire de leur surface extérieure 5.According to another advantageous characteristic of the invention, the junction zone between the recesses 8 and the material bridge 9 has a connection radius r, said connection radius r being in particular greater than 0.1 mm. Thus, on the most stressed area of the rollers 4, there is eliminated any risk of local over-stress due to sharp angles or connections of uncontrolled surfaces. In particular, the recesses 8 extend over a depth P defined between diameters di and d 2 , the connection radius r being formed from said bottom diameter d 2 . To allow retention of the rollers 4 in the running space during the rotation of the bearing, said rollers are arranged in a retention cage 7 so as to be rotatable about their axis of symmetry A while bearing on the members 1 , 2 through their outer surface 5.
Selon une réalisation, la cage 7 est formée d'une seule pièce, notamment par usinage d'un matériau métallique, pour comprendre une première couronne et, décalée axialement, une deuxième couronne, lesdites couronnes présentant un même diamètre. La cage comprend en outre une pluralité de traverses axiales qui s'étendent entre lesdites couronnes de sorte à former entre deux traverses adjacentes et les couronnes un logement de rétention d'un rouleau 4. En particulier, la géométrie interne du logement est formée pour épouser la périphérie du rouleau 4 en permettant sa rotation autour de son axe de symétrie A.According to one embodiment, the cage 7 is formed in one piece, in particular by machining a metallic material, to comprise a first ring and, offset axially, a second ring, said rings having the same diameter. The cage further comprises a plurality of axial crosspieces which extend between said crowns so as to form between two adjacent crosspieces and the crowns a retention housing of a roller 4. In particular, the internal geometry of the housing is formed to fit the periphery of the roll 4 allowing its rotation about its axis of symmetry A.
En outre, chaque face latérale d'un rouleau 4 est disposée en regard de respectivement une face latérale d'un logement, un moyen d'accrochage dudit rouleau étant formé sur chaque face latérale dudit logement. Selon une réalisation, le moyen d'accrochage comprend une saillie axiale engagée dans un évidement 8 du rouleau 4 de sorte à maintenir en rotation ledit rouleau dans ledit logement.In addition, each lateral face of a roll 4 is disposed facing respectively a side face of a housing, a hooking means of said roller being formed on each side face of said housing. According to one embodiment, the hooking means comprises an axial projection engaged in a recess 8 of the roll 4 so as to keep said roll in said housing in rotation.
On donne ci-dessous un exemple numérique pour les dimensions géométriques caractéristiques d'un rouleau 4 selon l'invention : L = 30 mmA numerical example is given below for the characteristic geometrical dimensions of a roll 4 according to the invention: L = 30 mm
D = 20 mmD = 20 mm
R = 50 mm d = 16 mmR = 50 mm d = 16 mm
Cl1 = 10 mm r = 3 mm e = 6 mm de = 7 mm
Sur ce rouleau 4, l'allégement selon l'invention permet de gagner environ 10g sur 70g ce qui est conséquent et très intéressant pour l'application considérée.
Cl 1 = 10 mm r = 3 mm e = e = 6 mm 7 mm On this roll 4, the lightening according to the invention makes it possible to gain about 10g over 70g which is substantial and very interesting for the application in question.
Claims
1. Rouleau (4) pour palier à roulement, ledit rouleau présentant une surface extérieure (5) de révolution autour d'un axe de symétrie (A) et une face latéraleRoller (4) for rolling bearing, said roller having an outer surface (5) of revolution about an axis of symmetry (A) and a side face
(6) disposée de chaque côté de ladite surface extérieure, ledit rouleau étant destiné à tourner dans ledit palier autour de son axe de symétrie (A) en étant en appui sur sa surface extérieure (5), ledit rouleau étant caractérisé en ce qu'il présente deux évidements (8) qui sont réalisés respectivement sur une face latérale (6) en s'étendant suivant l'axe de symétrie (A), lesdits évidements présentant un diamètre d'ouverture (di) mesuré sur la face latérale (6) et étant séparés axialement par un pont de matière (9) de longueur (e), ledit diamètre d'ouverture et ladite longueur du pont de matière (9) remplissant la condition géométrique suivante : 0,1 < — < 1.(6) disposed on each side of said outer surface, said roller being adapted to rotate in said bearing about its axis of symmetry (A) while resting on its outer surface (5), said roller being characterized in that it has two recesses (8) which are respectively formed on a lateral face (6) extending along the axis of symmetry (A), said recesses having an opening diameter (di) measured on the lateral face (6). ) and being axially separated by a material bridge (9) of length (e), said opening diameter and said length of the material bridge (9) fulfilling the following geometrical condition: 0.1 <- <1.
2. Rouleau pour palier à roulement selon la revendication 1 , caractérisé en ce que les faces latérales (6) présentent un diamètre (d) mesuré dans un plan transversal, le diamètre d'ouverture (d-i) étant tel que d -dx ≥ \mm .Roller for rolling bearing according to Claim 1, characterized in that the lateral faces (6) have a diameter (d) measured in a transverse plane, the opening diameter (di) being such that d -d x ≥ \ mm.
3. Rouleau pour palier à roulement selon la revendication 1 ou 2, caractérisé en ce que chaque évidement (8) présente une géométrie tronconique convergente en présentant un diamètre de fond (d2) sur la zone de jonction avec le pont de diamètre (9), ledit diamètre de fond étant inférieur au diamètre d'ouverture (di).Roller for rolling bearing according to claim 1 or 2, characterized in that each recess (8) has a convergent frustoconical geometry having a bottom diameter (d 2 ) on the junction area with the diameter bridge (9). ), said bottom diameter being smaller than the opening diameter (di).
4. Rouleau pour palier à roulement selon la revendication 3, caractérisé en ce que la surface extérieure (5) présente un diamètre maximal (D) et est destinée à présenter une ellipse de contact (10) dans le palier, chaque évidement (8) présentant un diamètre (de) mesuré au quart de la grande longueur (Le) de ladite ellipse, ledit diamètre étant tel que de < 4^ . Roller for roller bearing according to Claim 3, characterized in that the outer surface (5) has a maximum diameter (D) and is intended to have a contact ellipse (10) in the bearing, each recess (8). having a diameter (d e ) measured at a quarter of the great length (L e ) of said ellipse, said diameter being such that d e < 4 ^.
5. Rouleau pour palier à roulement selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la zone de jonction entre les évidements (8) et le pont de matière (9) présente un rayon de raccordement (r).5. Roller for rolling bearing according to any one of claims 1 to 4, characterized in that the junction area between the recesses (8) and the material bridge (9) has a connecting radius (r).
6. Rouleau pour palier à roulement selon la revendication 5, caractérisé en ce que le rayon de raccordement (r) est supérieur à 0,1 mm.Roller for rolling bearing according to Claim 5, characterized in that the connecting radius (r) is greater than 0.1 mm.
7. Rouleau pour palier à roulement selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la surface extérieure (5) présente une géométrie sphérique en tonneau dans laquelle le diamètre (d) des faces latérales (6) est inférieur au diamètre central (D) de ladite surface extérieure, ledit diamètre central étant formé autour du pont de matière (9).Roller for rolling bearing according to any one of claims 1 to 6, characterized in that the outer surface (5) has a spherical barrel geometry in which the diameter (d) of the side faces (6) is smaller than the central diameter (D) of said outer surface, said central diameter being formed around the material bridge (9).
8. Palier à roulement comprenant un organe intérieur (1) et un organe extérieur (2) entre lesquels sont montés des rouleaux (4) selon l'une quelconque des revendications 1 à 7, lesdits rouleaux étant disposés dans une cage de rétention (7) de sorte à pouvoir tourner autour de leur axe de symétrie (A) en étant en appui sur lesdits organes par l'intermédiaire de leur surface extérieure (5).Roller bearing comprising an inner member (1) and an outer member (2) between which are mounted rollers (4) according to any one of claims 1 to 7, said rollers being arranged in a holding cage (7). ) so as to be rotatable about their axis of symmetry (A) bearing on said members via their outer surface (5).
9. Palier à roulement selon la revendication 8, caractérisé en ce que la cage de rétention (7) comprend deux couronnes et une pluralité de traverses axiales s'étendant entre lesdites couronnes de sorte à former entre deux traverses adjacentes et les couronnes un logement de rétention d'un rouleau (4), chaque face latérale (6) dudit rouleau étant disposée en regard de respectivement une face latérale du logement, un moyen d'accrochage dudit rouleau étant formé sur chaque face latérale dudit logement, ledit moyen d'accrochage comprenant une saillie axiale engagée dans un évidement (8) dudit rouleau de sorte à maintenir en rotation ledit rouleau dans ledit logement.9. rolling bearing according to claim 8, characterized in that the retention cage (7) comprises two rings and a plurality of axial crosspieces extending between said rings so as to form between two adjacent sleepers and the crowns a housing of retaining a roller (4), each lateral face (6) of said roller being disposed opposite respectively a lateral face of the housing, a hooking means of said roller being formed on each lateral face of said housing, said hooking means comprising an axial projection engaged in a recess (8) of said roll so as to keep said roll in said housing in rotation.
10. Palier à roulement selon la revendication 9, caractérisé en ce que la surface extérieure de l'organe extérieur (2) est pourvue d'un moyen d'engrenage (3) pour son utilisation dans un train épicycloïdal. 10. Rolling bearing according to Claim 9, characterized in that the outer surface of the outer member (2) is provided with a gear means (3) for use in an epicyclic gear train.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0901803A FR2944330B1 (en) | 2009-04-10 | 2009-04-10 | ROLLER FOR BEARING BEARING |
PCT/FR2010/000291 WO2010116058A1 (en) | 2009-04-10 | 2010-04-06 | Roller for a rolling bearing |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2417371A1 true EP2417371A1 (en) | 2012-02-15 |
Family
ID=41254602
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10717184A Withdrawn EP2417371A1 (en) | 2009-04-10 | 2010-04-06 | Roller for a rolling bearing |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2417371A1 (en) |
FR (1) | FR2944330B1 (en) |
WO (1) | WO2010116058A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2981997B1 (en) * | 2011-10-31 | 2014-07-25 | Ntn Snr Roulements | EXTRACTION OF A ROLLER BEARING. |
DE102016220052A1 (en) * | 2016-10-14 | 2018-04-19 | Schaeffler Technologies AG & Co. KG | Roller for a rolling bearing and rolling bearing with the roller |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB181156A (en) * | 1921-03-24 | 1922-06-15 | Karl Oscar Leon | Improvements in and relating to roller bearings |
JP2005030582A (en) * | 2003-01-31 | 2005-02-03 | Nsk Ltd | Needle bearing, shaft, car cooler compressor, and planetary gear mechanism for automatic transmission |
DE102005059033A1 (en) * | 2005-12-10 | 2007-06-28 | Schaeffler Kg | Radial rolling bearings, in particular single-row grooved rolling bearings |
DE102006052045A1 (en) * | 2006-11-04 | 2008-05-08 | Ab Skf | Tapered roller bearing |
DE102006052044A1 (en) * | 2006-11-04 | 2008-05-08 | Ab Skf | Tapered rolling element and tapered roller bearing with the rolling elements |
-
2009
- 2009-04-10 FR FR0901803A patent/FR2944330B1/en not_active Expired - Fee Related
-
2010
- 2010-04-06 WO PCT/FR2010/000291 patent/WO2010116058A1/en active Application Filing
- 2010-04-06 EP EP10717184A patent/EP2417371A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO2010116058A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2944330B1 (en) | 2012-01-13 |
WO2010116058A1 (en) | 2010-10-14 |
FR2944330A1 (en) | 2010-10-15 |
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