(19)
(11)EP 3 187 742 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
29.04.2020 Bulletin 2020/18

(21)Application number: 16205846.5

(22)Date of filing:  21.12.2016
(51)International Patent Classification (IPC): 
F16C 43/04(2006.01)
F16H 57/023(2012.01)

(54)

ASSEMBLING PROCESS FOR MOUNTING A ROLLING BEARING ON A GEAR SHAFT, AND GEAR ASSEMBLY OBTAINABLE BY SUCH A PROCESS

MONTAGEVERFAHREN ZUM MONTIEREN EINES WÄLZLAGERS AUF EINER GETRIEBEWELLE UND DURCH SOLCH EIN VERFAHREN ERHALTBARE ZAHNRADBAUGRUPPE

PROCÉDÉ D'ASSEMBLAGE POUR LE MONTAGE D'UN PALIER À ROULEMENT SUR UN ARBRE DE TRANSMISSION ET ENSEMBLE D'ENGRENAGE POUVANT ÊTRE OBTENU PAR UN TEL PROCÉDÉ


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 22.12.2015 IT UB20159160

(43)Date of publication of application:
05.07.2017 Bulletin 2017/27

(73)Proprietor: GE Avio S.r.l.
10040 Rivalta di Torino (TO) (IT)

(72)Inventors:
  • ALTAMURA, Paolo
    72100 Brindisi (IT)
  • PERCACCIOLO, Salvatore
    10040 Rivalta di Torino (IT)
  • ORLANDO, Leonardo
    10040 Rivalta di Torino (IT)
  • MAFFIOTTO, Marco
    10040 Rivalta di Torino (IT)

(74)Representative: Openshaw & Co. 
8 Castle Street
Farnham, Surrey GU9 7HR
Farnham, Surrey GU9 7HR (GB)


(56)References cited: : 
DE-A1- 3 217 793
JP-A- H08 184 319
US-A- 3 792 625
DE-A1-102011 006 599
JP-A- 2009 243 609
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description


    [0001] The present invention relates to an assembling process for mounting a rolling bearing on a gear shaft.

    [0002] Gears having a shaft and two toothings which are axially distanced from each other and connected to each other by an intermediate portion of such shaft are well known. Gears of this type are coupled to a supporting structure by means of a pair of rolling bearings, which are mounted on opposite ends of the shaft, with two toothings arranged in intermediate positions between the bearings.

    [0003] The need is felt to provide a gear which is more compact in axial direction, in particular for applications in which it is used as planet gear in an epicyclic transmission.

    [0004] It is the object of the present invention to provide an assembling process for mounting a rolling bearing on a gear shaft, which makes it possible to satisfy the need illustrated above in simple and cost-effective manner.

    [0005] DE 10 2011 006 599 A1 relates to a shaft-hub connection and discloses features generally corresponding to the preamble of claim 5.

    [0006] According to the present invention, an assembling process for mounting a rolling bearing on a gear shaft is provided, as defined in claim 1.

    [0007] According to the present invention, a gear assembly, provided with a gear and a rolling bearing, is also provided, as defined in claim 5.

    [0008] The invention will now be described with reference to the accompanying drawings which illustrate a non-limitative embodiment thereof, in which:
    • figure 1 is a perspective view of a gear assembly which can be obtained by means of a preferred embodiment of the assembling process of the present invention;
    • figure 2 is a section taken along a meridian section plane identified by line II-II in figure 1; and
    • figures 3 and 4 are perspective views related to two different steps of the assembling process of the present invention.


    [0009] In figure 1, reference numeral 1 indicates a gear assembly consisting of a gear or toothed wheel 2 and of two rolling bearings 3 and 4. Preferably, but not exclusively, the toothed wheel 2 defines a planet gear in an epicyclic transmission (not shown).

    [0010] As shown in figure 2, the toothed wheel 2 is advantageously defined by a single part and not by parts fixed to one another, and comprises of a pin or shaft 5, which extends along an axis 6. The shaft 5 comprises of two cylindrical portions 7 and 8 on which are mounted, respectively, bearings 3 and 4. The shaft 5 further includes an intermediate portion 9, which is arranged between the portions 7,8 and includes a cylindrical stretch 10 and, preferably, a frustoconical stretch 11 which connects the stretch 10 to the portion 7 and has decreasing radius towards portion 7.

    [0011] The toothed wheel 2 further includes two outer toothings, 12 and 13, which are axially distanced from each other and connected to each other by portion 8, and are specifically defined by straight teeth.

    [0012] According to a preferred aspect of the present invention, the toothing 13 is arranged on an end of the shaft 5, and thus is arranged overhanging with respect to the support defined by the bearing 4. In particular, the toothing 13 is connected to an axial end 14 of the portion 8 by means of an annular flange 15.

    [0013] In particular, the toothing 12 is made directly on the stretch 10, without any intermediate flange between the toothing 12 and the shaft 5. Therefore, the toothing 12 has a smaller diameter than the toothing 13 and is axially aligned with the flange 15.

    [0014] The portion 8 has an outer surface 16, which is cylindrical and has an outer diameter smaller than that of the toothing 12, and thus defines an undercut with respect to the toothing 12. Advantageously, the surface 16 directly defines an inner rolling path for the rolling bodies of the bearing 4, which is thus free from an inner ring. In particular, such rolling bodies are defined by rollers 18.

    [0015] The bearing 4 further comprises an outer ring 20, advantageously consisting of two annular bodies 21 and 22, which are coaxial, fixed to each other and have respective axial shoulders 23 and 24 which are arranged on opposite axial parts of the rollers 18. The inner diameter of the shoulders 23 and 24 is greater than the outer diameter of the teeth 12a of the toothing 12 (figure 1).

    [0016] The body 21 is closest to the flange 15, while the body 22 defines an outer rolling path 25 for the rollers 18. For the mutual fixing, the bodies 21 and 22 feature specifically outer radial protrusions 26 and 27, which are fixed to each other by means of screws or bolts 28. The flange 15 is provided with at least one hole 29, obtained at the same radius as the screws 28, to allow the fastening thereof.

    [0017] Finally, as shown in figure 3, bearing 4 comprises a cage 30, the size and shape of which is such to be able to be axially fitted around the toothing 12 and axially displaced without interference to reach portion 8 during the assembly process. In particular, the cage 30 presents two circular rings 32, which are coaxial and axially distanced and have an inner diameter which is greater than the outer diameter of the teeth 12a. The cage 30 further comprises a plurality of tenons or arms 34, which are parallel to the axis 6, connect the rings 32 to each other and are equally distanced around the axis 6 so as to define the sides of a plurality of seats 35.

    [0018] As shown in figure 4, each roller 18 is housed in its respective seat 35 and retained in such seat 35 by tabs 38, which radially protrude towards the outside from the arms 34. In particular, the dimension of the arms 34 defines an inner diameter which is smaller than the outer diameter of the teeth 12a, so that the arms 34 radially protrude towards the inside with respect to the circular profile of the rings 32. According to an aspect of the present invention, the number of the arms 34 is either a sub-multiple or is equal to that of the slots 12b; moreover, the dimensions of the arms 34 is smaller than that of the slots 12b, which are envisaged between the teeth 12a in circumferential direction. In other words, with respect to axis 6, the inner diameter of the arms 34 is broader than the position of the bottom of the slots 12b; and the size of the arms 34 in circumferential direction is narrower than the distance between adjacent teeth 12a. In this manner, during assembly, when the cage 30 is made to slide axially towards the portion 8, as shown in figure 3, the arms 34 axially pass through the slots 12b without interference.

    [0019] Furthermore, the arms or tenons 34 are designed so as to have the necessary structural strength and to guarantee the correct positioning of the rollers 18 at the end of the assembly. In particular, the arms 34 are designed so as to maximize the contact surface with the rollers 18, in the sense of the rolling direction. Furthermore, the center of the arms 34 is positioned, with respect to the axis 6, at a radius which is substantially equal to that in which the centers of the rollers 18 are positioned.

    [0020] The assembling process requires first of all the axial fitting of body 21 and then of cage 30 until these two components are arranged around the portion 8, i.e. axially beyond the toothing 12. After these operations, the rollers 18 are inserted radially from the outside inwards in the respective seats 35 so as to lay them onto the surface 16, as shown in figure 4. After inserting each roller 18, the two tabs 38, which are adjacent, are bent by means of plastic deformation, e.g. by riveting, so as to lay onto the roller 18 itself. Therefore, by means of such bending, the tabs 38 retain the roller 18 in the corresponding seat 35 against the surface 16.

    [0021] After having mounted all the rollers 35 in the cage 30, the body 22 is axially fitted around the toothing 12 and then axially moved so as to be arranged around the rollers 18, until it axially couples the shoulder 24 against the rollers 18 and the protrusions 27 against the protrusions 26. At this point, the protrusions 26 and 27 are fixed to each other in order to define the outer ring 20 of the bearing 4.

    [0022] The features and the assembly method of the bearing 3 are well known and thus not described in detail.

    [0023] From the above, it is apparent that the proposed solution makes it possible to mount the bearing 4 at an undercut of the toothed wheel 2, so that it is possible to make a shaft 5 of shorter length than the known solutions, in which the two bearings are arranged at the ends of the shaft, on opposite axial parts of the two toothings.

    [0024] The suggested solution is then relatively simple and has a relatively low number of components. In all cases, the conformation of the arms 34 described above makes it possible to design the cage 30 so as to satisfy the necessary requirements of strength and reliability.

    [0025] From the above, it is apparent that changes and variations may be made to the assembling process and to the assembly 1 described above, with reference to the accompanying figures, without departing from the scope of protection of the appended claims.

    [0026] In particular, the cage 30 could consist of multiple parts, fixed to each other during the assembling process: for example, one of the two rings 32 could belong to a part separated from the arms 34 and fixed to them.

    [0027] Furthermore, the rolling bodies of the bearing 4 could be retained in the respective seats 35 of the cage 30 in a different way from what described above by way of example: for example, such rolling bodies could be coupled by snapping into the seats 35 during their radial insertion without needing a plastic deformation of the cage 30.

    [0028] The outer ring 20 could be made differently from what preferably described by way of example; and/or the toothed wheel 2 could be made of separate parts which are fixed to each other before mounting the bearing 4 on the portion 8.


    Claims

    1. An assembling process for mounting a rolling bearing (4) on a gear shaft (5), which extends along an axis (6) and carries a first and a second toothing (12,13), axially separated one from the other by a cylindrical portion (8) of said gear shaft (5); said cylindrical portion (8) having an outer diameter smaller than that of said first toothing (12); said bearing (4) comprising:

    - a plurality of rolling bodies (18);

    - a cage (30) defining a plurality of seats (35) each engageable by a respective rolling body (18);

    - an outer ring (20) defining an outer rolling path (25) for the rolling bodies (18);

    the process is characterized by the following steps:

    - fitting the cage (30) around the first toothing (12) and axially towards the second toothing (13) until the cage (30) is arranged around the cylindrical portion (8);

    - inserting the rolling bodies (18) radially in the respective seats (35) after having fitted the cage (30).


     
    2. A process according to claim 1, characterized in that the cage (30) comprises a plurality of arms (34), which delimit the seats (35) in a circumferential direction and run axially through the slots (12b) between the teeth (12a) of the first toothing (12) when the cage (30) is fitted.
     
    3. A process according to claim 1 or 2, characterized in that the rolling bodies (18) are inserted in the seats (35) so as to be arranged in abutment onto an outer surface (16) of the cylindrical portion (8), which defines an inner rolling path for the rolling bodies (18).
     
    4. A process according to any one of the preceding claims, characterized in that the outer ring (20) comprises a first and a second body (21,22), coaxial with each other; and characterized by:

    - fitting the first body (21) around the first toothing (12) and axially towards the second toothing (13), before fitting the cage (30);

    - fitting the second body (22) around the first toothing (12) and axially towards the second toothing (13) after having inserted the rolling bodies (18) into the seats (35);

    - fixing the second body (22) to the first body (21).


     
    5. A gear assembly (1) comprising:

    - a toothed wheel (2) comprising:

    a) a gear shaft (5) extending along an axis (6);

    b) a first and a second toothing (12,13) carried by the gear shaft (5) and axially separated one with respect to the other by a cylindrical portion (8) of the gear shaft (5);

    - a rolling bearing (4) comprising:

    a) a plurality of rolling bodies (18);

    b) a cage (30) defining a plurality of seats (35) each engageable by a respective rolling body (18);

    c) an outer ring (20) defining an outer rolling path (25) for the rolling bodies (18);

    the cylindrical portion (8) having an outer diameter smaller than that of the first toothing (12); wherein said cage (30) has sizes and shape such that it can, without interference, be axially fitted around the first toothing (12) and axially displaced towards the second toothing (13) so as to be arranged around the cylindrical portion (8) during assembly; wherein said cage comprises a plurality of arms (34) parallel to said axis (6), equally spaced about the axis (6) and delimiting the seats (35) in a circumferential direction characterized in that said cage (30) further comprises:

    - two circular rings (32), which are coaxial, axially delimit the seats (35) and have an inner diameter greater than the outer diameter of the teeth (12a) of the first toothing (12).


     
    6. A gear assembly according to claim 5, characterized in that the cage (30) comprises, for each arm (34), two respective tabs (38) which radially protrude towards the outside from the arm (34) so as to retain the rolling bodies (18) in the respective seats (35).
     
    7. A gear assembly according to claim 5 or 6, characterized in that the arms (34) radially protrude towards the inside with respect to the circular rings (32) and define an inner diameter that is between the outer diameter and the inner diameter of the teeth (12a) of the first toothing (12); the number of the arms (34) being a sub-multiple or being equal to that of the teeth of the first toothing (12).
     
    8. A gear assembly according to any of claims from 5 to 7, characterized in that the outer ring (20) comprises two annular bodies (21,22), which are coaxial and fixed one with respect to the other and have respective shoulders (23,24) arranged from opposite axial sides of the rolling bodies (18).
     
    9. A gear assembly according to claim 8, characterized in that the annular bodies (21,22) comprise respective outer radial protrusions (26,27) fixed to each other by means of screws or bolts (28).
     
    10. A assembly according to claim 9, characterized in that the second toothing (13) is connected to the gear shaft (5) by means of a flange (15), which is provided with at least one through hole (29), made at the same radius in which the screws or bolts (28) are provided.
     
    11. A gear assembly according to any of claims from 5 to 10, characterized in that the cylindrical portion (8) has an outer cylindrical surface (16) defining an inner rolling path for the rolling bodies (18).
     
    12. A gear assembly according to any of claims from 5 to 11, characterized in that the toothed wheel (2) is defined by a single piece.
     
    13. A gear assembly according to any one of the claims 5 to 12, characterized in that said second toothing (13) is arranged at one axial end of said gear shaft (5).
     


    Ansprüche

    1. Montageverfahren zum Montieren eines Wälzlagers (4) auf eine Getriebewelle (5), die sich entlang einer Achse (6) erstreckt und eine erste und eine zweite Verzahnung (12, 13) trägt, die axial durch einen zylindrischen Abschnitt (8) der Getriebewelle (5) voneinander getrennt sind;

    wobei der zylindrische Abschnitt (8) einen Außendurchmesser aufweist, der kleiner als der der ersten Verzahnung (12) ist;

    wobei das Lager (4) Folgendes umfasst:

    - mehrere Wälzkörper (18);

    - einen Käfig (30), der mehrere Lagersitze (35) definiert, die jeweils mit einem jeweiligen Wälzkörper (18) in Eingriff gebracht werden können;

    - einen Außenring (20), der einen Außenwälzpfad (25) für die Wälzkörper (18) definiert;

    wobei das Verfahren durch folgende Schritte gekennzeichnet ist:

    - Anbringen des Käfigs (30) um die erste Verzahnung (12) und axial in Richtung der zweiten Verzahnung (13), bis der Käfig (30) um den zylindrischen Abschnitt (8) angeordnet ist;

    - radiales Einführen der Wälzkörper (18) in die jeweiligen Lagersitze (35) nach dem Anbringen des Käfigs (30).


     
    2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Käfig (30) mehrere Arme (34) umfasst, die die Lagersitze (35) in Umfangsrichtung begrenzen und axial durch die Schlitze (12b) zwischen den Zähnen (12a) der ersten Verzahnung (12) verlaufen, wenn der Käfig (30) angebracht ist.
     
    3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Wälzkörper (18) in die Lagersitze (35) eingeführt werden, um in einem Auflager auf eine Außenoberfläche (16) des zylindrischen Abschnitts (8) angeordnet zu werden, der einen Innerenwälzpfad für die Wälzkörper (18) definiert.
     
    4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Außenring (20) einen ersten und einen zweiten Körper (21,22) umfasst, die koaxial zueinander sind; und
    gekennzeichnet durch:

    - Anbringen des ersten Körpers (21) um die erste Verzahnung (12) und axial in Richtung der zweiten Verzahnung (13), bevor der Käfig (30) angebracht wird;

    - Anbringen des zweiten Körpers (22) um die erste Verzahnung (12) und axial in Richtung der zweiten Verzahnung (13), nachdem die Wälzkörper (18) in die Lagersitze (35) eingeführt wurden;

    - Befestigen des zweiten Körpers (22) am ersten Körper (21).


     
    5. Getriebeanordnung (1), Folgendes umfassend:

    - ein Zahnrad (2), Folgendes umfassend:

    a) eine Getriebewelle (5), die sich entlang einer Achse (6) erstreckt;

    b) eine erste und eine zweite Verzahnung (12, 13), die von der Getriebewelle (5) getragen werden und durch einen zylindrischen Abschnitt (8) der Getriebewelle (5) axial mit Bezug auf die andere getrennt sind;

    - ein Wälzlager (4), Folgendes umfassend:

    a) mehrere Wälzkörper (18);

    b) einen Käfig (30), der mehrere Lagersitze (35) definiert, die jeweils mit einem jeweiligen Wälzkörper (18) in Eingriff gebracht werden können;

    c) einen Außenring (20), der einen Außenwälzpfad (25) für die Wälzkörper (18) definiert;

    den zylindrischen Abschnitt (8), der einen Außendurchmesser aufweist, der kleiner als der der ersten Verzahnung (12) ist;
    wobei der Käfig (30) solche Größen und Formen derart aufweist, dass er, ohne Unterschnitt, um die erste Verzahnung (12) axial angebracht und axial zur zweiten Verzahnung (13) hin verschoben werden kann, um während der Anordnung um den zylindrischen Abschnitt (8) angeordnet zu werden;
    wobei der Käfig mehrere Arme (34) parallel zur Achse (6) umfasst, die in gleichem Abstand um die Achse (6) angeordnet sind und die Lagersitze (35) in eine Umfangsrichtung begrenzen, dadurch gekennzeichnet, dass der Käfig (30) ferner Folgendes umfasst:

    - zwei kreisförmige Ringe (32), die koaxial sind, die die Lagersitze (35) axial begrenzen und einen Innendurchmesser aufweisen, der größer ist als der Außendurchmesser der Zähne (12a) der ersten Verzahnung (12).


     
    6. Getriebeanordnung nach Anspruch 5, dadurch gekennzeichnet, dass der Käfig (30), für jeden Arm (34), zwei jeweilige Laschen (38) umfasst, die radial vom Arm (34) nach außen vorstehen, um die Wälzkörper (18) in den jeweiligen Lagersitzen (35) zu halten.
     
    7. Zahnradanordnung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Arme (34) in Bezug auf die kreisförmigen Ringe (32) radial nach innen vorstehen und einen Innendurchmesser definieren, der zwischen dem Außendurchmesser und dem Innendurchmesser der Zähne (12a) der ersten Verzahnung (12) liegt;
    wobei die Anzahl der Arme (34) ein Bruchteil oder gleich der Anzahl der Zähne der ersten Verzahnung (12) ist.
     
    8. Getriebeanordnung nach einem der Ansprüche von 5 bis 7, dadurch gekennzeichnet, dass der Außenring (20) zwei ringförmige Körper (21, 22) umfasst, die koaxial und fest miteinander verbunden sind und jeweilige Schultern (23, 24) aufweisen, die von gegenüberliegenden axialen Seiten der Wälzkörper (18) aus angeordnet sind.
     
    9. Getriebeanordnung nach Anspruch 8, dadurch gekennzeichnet, dass die ringförmigen Körper (21, 22) jeweils äußere radiale Vorsprünge (26, 27) umfassen, die mittels Schrauben oder Bolzen (28) aneinander befestigt sind.
     
    10. Anordnung nach Anspruch 9, dadurch gekennzeichnet, dass die zweite Verzahnung (13) mit der Getriebewelle (5) mittels eines Flansches (15) verbunden ist, der mit wenigstens einem Durchgangsloch (29) versehen ist, das in demselben Radius hergestellt ist, in dem die Schrauben oder Bolzen (28) vorgesehen sind.
     
    11. Getriebeanordnung nach einem der Ansprüche von 5 bis 10, dadurch gekennzeichnet, dass der zylindrische Abschnitt (8) eine zylindrische Außenoberfläche (16) aufweist, die einen Innenwälzpfad für die Wälzkörper (18) definiert.
     
    12. Getriebeanordnung nach einem der Ansprüche von 5 bis 11, dadurch gekennzeichnet, dass das Zahnrad (2) durch ein einziges Stück definiert ist.
     
    13. Getriebeanordnung nach einem der Ansprüche 5 bis 12, dadurch gekennzeichnet, dass die zweite Verzahnung (13) an einem axialen Ende der Getriebewelle (5) angeordnet ist.
     


    Revendications

    1. Procédé d'assemblage pour monter un roulement (4) sur un arbre de transmission (5), lequel s'étend le long d'un axe (6) et porte une première et une seconde dentelure (12, 13), séparées axialement l'une de l'autre par une partie cylindrique (8) dudit arbre de transmission (5) ; ladite partie cylindrique (8) ayant un diamètre extérieur inférieur à celui de ladite première dentelure (12) ; ledit roulement (4) comprenant :

    - une pluralité de corps roulants (18) ;

    - une cage (30) définissant une pluralité de sièges (35), chacun pouvant être mis en prise par un corps roulant respectif (18) ;

    - une bague extérieure (20) définissant un chemin de roulement extérieur (25) pour les corps roulants (18) ;

    le procédé est caractérisé par les étapes suivantes :

    - monter la cage (30) autour de la première dentelure (12) et axialement vers la seconde dentelure (13) jusqu'à ce que la cage (30) soit agencée autour de la partie cylindrique (8) ;

    - insérer les corps roulants (18) radialement dans les sièges respectifs (35) après avoir monté la cage (30).


     
    2. Procédé selon la revendication 1, caractérisé en ce que la cage (30) comprend une pluralité de bras (34), lesquels délimitent les sièges (35) dans une direction circonférentielle et traversent axialement les fentes (12b) entre les dents (12a) de la première dentelure (12) lorsque la cage (30) est montée.
     
    3. Procédé selon la revendication 1 ou 2, caractérisé en ce que les corps roulants (18) sont insérés dans les sièges (35) de manière à être agencés en butée sur une surface extérieure (16) de la partie cylindrique (8), laquelle définit un chemin de roulement intérieur pour les corps roulants (18).
     
    4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la bague extérieure (20) comprend un premier et un second corps (21, 22), coaxiaux l'un à l'autre ; et caractérisé par :

    - le montage du premier corps (21) autour de la première dentelure (12) et axialement vers la seconde dentelure (13), avant le montage de la cage (30) ;

    - le montage du second corps (22) autour de la première dentelure (12) et axialement vers la seconde dentelure (13) après l'insertion des corps roulants (18) dans les sièges (35) ;

    - la fixation du second corps (22) au premier corps (21).


     
    5. Ensemble engrenage (1) comprenant :

    - une roue dentée (2) comprenant :

    a) un arbre de transmission (5) s'étendant le long d'un axe (6) ;

    b) une première et une seconde dentelures (12, 13) portées par l'arbre de transmission (5) et séparées axialement l'une par rapport à l'autre par une partie cylindrique (8) de l'arbre de transmission (5) ;

    - un roulement (4) comprenant :

    a) une pluralité de corps roulants (18) ;

    b) une cage (30) définissant une pluralité de sièges (35), chacun pouvant être mis en prise par un corps roulant respectif (18) ;

    c) une bague extérieure (20) définissant un chemin de roulement extérieur (25) pour les corps roulants (18) ;

    la partie cylindrique (8) ayant un diamètre extérieur inférieur à celui de la première dentelure (12) ;
    ladite cage (30) ayant des dimensions et une forme telles qu'elle peut, sans interférence, être montée axialement autour de la première dentelure (12) et déplacée axialement vers la seconde dentelure (13) de manière à être agencée autour de la partie cylindrique (8) pendant l'assemblage ;
    ladite cage comprenant une pluralité de bras (34) parallèles audit axe (6), également espacés autour de l'axe (6) et délimitant les sièges (35) dans une direction circonférentielle, caractérisée en ce que ladite cage (30) comprend en outre :

    - deux bagues circulaires (32), qui sont coaxiales, délimitant axialement les sièges (35) et ayant un diamètre intérieur supérieur au diamètre extérieur des dents (12a) de la première dentelure (12).


     
    6. Ensemble engrenage selon la revendication 5, caractérisé en ce que la cage (30) comprend, pour chaque bras (34), deux pattes respectives (38) qui font saillie radialement vers l'extérieur du bras (34) de manière à retenir les corps roulants (18) dans les sièges respectifs (35).
     
    7. Ensemble engrenage selon la revendication 5 ou 6, caractérisé en ce que les bras (34) font radialement saillie vers l'intérieur par rapport aux bagues circulaires (32) et définissent un diamètre intérieur compris entre le diamètre extérieur et le diamètre intérieur des dents (12a) de la première dentelure (12) ;
    le nombre de bras (34) étant un sous-multiple ou égal à celui des dents de la première dentelure (12).
     
    8. Ensemble d'engrenage selon l'une quelconque des revendications 5 à 7, caractérisé en ce que la bague extérieure (20) comprend deux corps annulaires (21, 22), lesquels sont coaxiaux et fixes l'un par rapport à l'autre et ont des épaulements respectifs (23, 24) agencés à partir de côtés axiaux opposés des corps roulants (18).
     
    9. Ensemble engrenage selon la revendication 8, caractérisé en ce que les corps annulaires (21, 22) comprennent des saillies radiales extérieures respectives (26, 27) fixées l'une à l'autre au moyen de vis ou boulons (28).
     
    10. Ensemble engrenage selon la revendication 9, caractérisé en ce que la seconde dentelure (13) est reliée à l'arbre de transmission (5) au moyen d'une bride (15), laquelle est pourvue d'au moins un trou traversant (29), réalisé dans le même rayon dans lequel les vis ou boulons (28) sont pourvus.
     
    11. Ensemble engrenage selon l'une quelconque des revendications 5 à 10, caractérisé en ce que la partie cylindrique (8) a une surface cylindrique extérieure (16) définissant un chemin de roulement intérieur pour les corps roulants (18).
     
    12. Ensemble engrenage selon l'une quelconque des revendications 5 à 11, caractérisé en ce que la roue dentée (2) est définie par une seule pièce.
     
    13. Ensemble engrenage selon l'une quelconque des revendications 5 à 12, caractérisé en ce que ladite seconde dentelure (13) est agencée au niveau d'une extrémité axiale dudit arbre de transmission (5).
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



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    Patent documents cited in the description