• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:FR3017678A1
    申请号:FR1451201
    申请日:2014-02-14
    公开日:2015-08-21
    发明作者:Christophe Magnin
    申请人:SKF AB；
    IPC主号:
    专利说明:

    [0001] The present invention relates to the field of roller screw mechanisms for transforming a rotational movement into a linear translational movement, and vice versa. Such a mechanism is provided with a screw comprising an internal thread, a nut disposed around the screw and comprising an internal thread and a plurality of longitudinal rollers respectively engaged with the external and internal threads of the screw and 1 nut. A first type of roller screw mechanism comprises rollers having an external thread engaged with the outer and inner threads of the screw and the nut. The threads of the rollers and the threading of the nut have identical helix angles to each other and different from that of the thread of the screw so that, when the screw rotates relative to the nut, the rollers turn on them. same and roll around the screw without moving axially inside the nut. The rollers are guided in rotation parallel to the axis of the screw by teeth set on the nut and engaged with teeth of said rollers. Such a mechanism is called satellite roller screw. A second type of roller screw mechanism has a similar operating principle but is differentiated by an inverted arrangement. The helix angles of the threads of the rollers, the screw and the nut are chosen so that when the screw rotates relative to the nut, the rollers turn about themselves around the screw and move axially. in the nut. The rollers are guided in rotation parallel to the axis of the screw by teeth arranged thereon and cooperating with teeth of said rollers. Such a mechanism is called inverse satellite roller screws.
    [0002] To mount the rollers in the roller screw mechanism, the rollers are mounted one by one manually until the beginning of the threads is arranged in the right place. However, the rollers must be positioned in the nut so as to have the same axial position. Indeed, when the roller is mounted in the nut in the known manner, the teeth of the roller meshing in the ring and the pins are positioned in a recess of the annular rings. If the axial position of the roll is not the right one, that is to say that the roll is not found in the axis of the nut, then a radial clearance exists between the teeth of the roll and the crowns. The present invention therefore aims to solve these disadvantages by providing a roller screw mechanism of simple design and easy to assemble, while minimizing the radial clearance between the teeth of the roller and the crowns. The invention relates to a roller screw mechanism comprising a screw having an external thread, a nut disposed around and coaxially with said screw, the nut having an internal thread, and a plurality of identical rollers interposed between said screw and said nut and each having an external thread engaged with the outer and inner threads of said screw and said nut. The threading of each roll is axially extended at each end by a toothing which is itself extended axially by a cylindrical pin extending outwardly. The roller screw mechanism further comprises two annular rings fixed in a non-threaded portion of the bore of the nut and each comprising internally a toothing respectively engaged with the toothing of the rollers and two annular rings each mounted radially between the screw. and the associated ring and comprising a plurality of through cylindrical recesses uniformly distributed in the circumferential direction and within which are housed the trunnions of the rollers.
    [0003] Each of the rollers comprises a visual means of angular registration and the nut comprises a visual means of angular registration for angularly placing the rollers in the ring. The visual means of angular registration of the rollers must be in the same place for each of the rollers, for example at the beginning of the net. Advantageously, the visual means of angular registration of the rollers is made outside the thread. According to one embodiment, the visual means of angular registration of the rollers is formed on the lateral radial surface or the cylindrical axial surface of one of the teeth. According to one embodiment, the visual means of angular registration of the rollers is formed on the lateral radial surface or the cylindrical axial surface of one of the journals. According to one embodiment, the visual means for angular registration is deformation, machining or marking. According to one embodiment, the visual means of angular registration of the rollers is performed before the threading of the roll. In a second aspect, the invention relates to a mounting tool capable of mounting rollers in a previously described roller screw mechanism. The mounting tool comprises an annular body having a through-bore having an inner diameter greater than the outer diameter of the nut and a plurality of through-cylindrical recesses distributed evenly in the circumferential direction and each having a visual means of tracking. angular for each of the rollers. The mounting tool comprises at its cylindrical bore, a notch for cooperating with a rib of the nut to angularly position the tool relative to the nut. According to a third aspect, the invention relates to a method of mounting the rollers in a roller screw mechanism described above in which a first roll is positioned in the associated recess of one of the annular rings so that the visual means the angular position of the first roller is aligned with the visual means of the angular position of the nut; and rotating said first roll on itself until the adjacent recess in the annular ring is at the angular position visual means of the nut. In one embodiment, a second roll is positioned in the associated recess of the annular ring so that the visual means of angular position of the second roll is aligned with the visual means of the angular position of the nut, and said second roll is rotated on itself until the adjacent recess in the annular ring is at the visual angular position of the nut and the step of placing and rotation for each of the rollers. After mounting the first roller in the ring, the mounting tool can be positioned around the nut so that the notch cooperates with the rib of the nut and all the other rollers are positioned in the angular positions. corresponding to the angular positions of the visual means of angular registration of the mounting tool. Thus, all the visual means of angular position, respectively of the first roller, the nut and the first cylindrical recess of the mounting tool are aligned. 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: FIG. 1 is a partial view in axial section of a mechanism roller screw according to one embodiment of the invention; FIG. 2 is a perspective view of a roll according to a first embodiment of the invention; - Figure 3 is a perspective view of a roller according to a second embodiment of the invention; Figures 4, 5 and 6 illustrate the steps of the method of mounting the rollers in the roller screw mechanism of Figure 1; and FIG. 7 is a front view of a roller mounting tool in the roller screw mechanism of FIG. 1. As illustrated in the figures, a roller screw mechanism, referenced as a whole. , comprises a screw 12, of axis 14, provided with an external thread 16, a nut 18 mounted coaxially around the life 12 and provided with an internal thread 20, and a plurality of longitudinal rollers 22 arranged radially between the screw 12 and the nut 18. The internal thread 20 of the nut 18 has an inside diameter which is greater than the outside diameter of the external thread 16 of the screw 12. The screw 12 extends longitudinally through a cylindrical bore (not referenced ) of the nut 18 on which is formed the internal thread 20. The rollers 22, n in number, are identical to each other and regularly distributed around the screw 12. Each roller 22 extends along a coaxial axis 22a to the axis 14 of the screw 12 and comprises an external thread 24 engaged with the threading 16 of the screw 12 and the threading 20 of the nut 18. The threading 24 of each roll is axially extended at each end by a toothing 26, 28 which is itself extended axially by a cylindrical pin 30, 32 extending outwards. The roller screw mechanism 10 comprises two annular rings 34, 36 fixed in an unthreaded portion of the bore of the nut 18 and each having a toothing 38, 40 respectively engaged with the toothing 26, 28 of the rollers 22. for their synchronization. The roller screw mechanism 10 also comprises two annular rings 42, 44 each mounted radially between the thread 16 of the screw 12 and the associated crown 34, 36. Each annular ring 42, 44 comprises a plurality of cylindrical through recesses 42a, 44a regularly distributed in the circumferential direction and inside which are housed the journals 30, 32 of the rollers 22. The annular rings 42, 44 allow carry the rollers 22 and maintain a regular circumferential spacing of the rollers. As illustrated, the roller screw mechanism 10 also comprises rods 46, 48 mounted in a groove (not referenced) provided in the bore of the ring 34, 36 associated and provided to maintain axially the ring 42, 44 corresponding and two covers 50, 52 end fixed in the bore of the nut in the vicinity of said rings 42, 44. The covers 50, 52 axially close the bore of the nut 18 and each comprise a thread (not referenced ) The threads 24 of the rollers 22 and the thread 20 of the nut 18 have identical helical angles with each other and different from that of the threading 16 of the screw 12, so that when the screw 12 rotates relative to the nut 18, the rollers 22 turn on themselves and roll around the screw 12 without moving axially inside the nut 18. The rollers 22 are rotated parallel to the axis 4 by the teeth 38, 40 of the courts 34, 36. The screw 12 is movable axially or longitudinally with respect to the rollers 22. As illustrated in FIG. 2, each of the rollers 22 comprises an angular registration visual means 60 enabling the rollers 22 to be placed in the rings 34. , 36 relative to a predetermined reference point of one of the rings 34. The angular registration visual means 60 is made outside the thread 24, on the lateral radial surface 26a of one of the teeth 26 of the roller 22. The means visual angular registration 60 can be achieved before the threading of the roller 22.
    [0004] As illustrated in Figure 2, the visual angular registration means 60 is made by machining a rounded shape. Alternatively, it could be provided that the visual angular registration means 60 is a deformation or marking, such as for example paint. It should be noted that any other form could be provided for the visual means of angular registration 60. The embodiment illustrated in FIG. 3, in which the identical elements bear the same references, differs from the embodiment illustrated in FIG. 2. only by the position of the visual means of angular registration. As illustrated in FIG. 3, each of the rollers 22 comprises an angular registration visual means 62 made outside the thread 24, on the cylindrical axial surface 26b of one of the teeth 26 of the roll 22 and extends on the lateral surface. radial 26a of the toothing 26. Indeed one can see appear a triangular shape on the radial lateral surface 26a of the toothing 26. As shown in Figure 3, the visual means of angular registration 62 is a machining performed before the threading As a variant, it may be provided that the visual angular registration means 62 is a deformation or a marking. As a variant, it would be possible for the visual means for angular registration 60, 62 to be made on the lateral radial surface 30a or the cylindrical axial surface 30b of one of the journals 30.
    [0005] As illustrated in FIGS. 4 to 6, the nut comprises a visual means of angular registration 18a making it possible to place the rollers 22 angularly in the rings 34, 36. The visual means of angular registration 18a of the nut 18 is produced on the lateral radial surface (not referenced) of the nut 18. As illustrated in Figures 4 to 6, the visual means of angular registration 18a of the nut 18 is made by machining a rounded shape. Alternatively, it could be provided that the visual angular registration means 18a of the nut 18 is a deformation or marking, such as for example paint. It will be noted that any other form could be provided for the visual means of angular registration 18a of the nut 18. The rollers 22 are mounted in the nut 18 as follows with reference to FIGS. 4 to 6: automatically a first roller 22, in the recess 45, associated with the annular ring 44 referenced so that the angular position of the visual means 60, said first roller 22, is opposite the visual means of angular registration 18a of the nut 18, for example aligned and radially outwardly, i being the number of rollers 22 and recesses 45 between 1 and n. As illustrated in the figures, the number n is equal to eight. Alternatively one could provide a number n greater than or less than eight.
    [0006] The first roller 22 is then manually rotated on itself so that it moves radially in the ring 34 until the adjacent recess 45, + in the annular ring 44 is at level of the visual angular registration means 18a of the nut 18.
    [0007] As illustrated in FIG. 5, a second roll 22, + is positioned in the associated recess 45, + of the annular ring 44 so that the visual means of angular position 60, +, of the second roll 22, +, is opposite the visual means of angular registration 18a of the nut 18, for example aligned and radially outwardly, as can be seen in FIG. 5. As illustrated in FIG. rotates said second roller 22, +, on itself so that it moves radially in the ring 34 until the adjacent recess 45, + z in the annular ring 44 is at the level of of the visual angular registration means 18a of the nut 18 and a third roller 22, + 2 is positioned in the recess 45, + 2 associated with the annular ring 44 so that the angular position visual means 60, + 2 of the third roller 22 +2 is opposite the visual means of angular registration 18a of the nut 18, for example aligned and radially outwardly, as shown in Figure 6. It repeats the steps of introduction and rotation of the rollers 22 for each roll.
    [0008] Thus, thanks to the visual means of angular registration on both the rollers 22 and the nut 18, it is possible to have a single possible mounting of the rollers 22 in the nut 18. As illustrated in the figures, the rollers are positioned so that the visual angular registration means 60 are in each case aligned with the visual means of angular registration 18a of the nut 18 directed radially outwards. Alternatively, the position of the angular registration visual means 60 with respect to the angular registration visual means 18a of the nut 18 could be defined in any other way. For example, the angular registration visual means 60 may be each time aligned with the angular registration visual means 18a of the nut 18, but radially directed inwardly, or at an angle with the angular registration visual means 18a. of the nut 18.
    [0009] The embodiment illustrated in FIG. 7, in which the identical elements bear the same references, differs from the embodiment illustrated in FIGS. 4 to 6 by the fact that a mounting tool 70 is used to mount rollers. 22 in the ring 34 of the roller screw mechanism 10.
    [0010] The mounting tool 70 includes an annular body 72 having a through-bore 72a having an inside diameter greater than the outside diameter of the nut 18 and a plurality of through-cylindrical recesses 74, evenly distributed in the circumferential direction, i being the number of through cylindrical recesses 74 corresponding to the number of rollers 22 between 1 and n. The mounting tool 70 comprises at each cylindrical recess 74, an angular registration visual means 76 for each of the rollers 22. The mounting tool 70 comprises at its cylindrical bore 72a a notch 72b for cooperate with a rib 18b made on the outer cylindrical surface (not referenced) of the nut 18 and visible in Figure 7. Alternatively, one could provide a key in place of a rib. The cooperation of the rib 18b of the nut 18 with the groove 72b of the mounting tool 70 enables the mounting tool 70 to be angularly positioned relative to the nut 18, so that the visual means for locating The angle 18a of the nut 18 is aligned with the angular registration visual means 76 of the first recess 74 of the mounting tool 70. The rollers 22 are mounted in the ring 34 as follows: Manually or manually positioned automatically a first roller 22, in the recess 45 associated with the annular ring 44 referenced so that the visual means of angular position 60 of said first roller 22, is aligned with the visual means of angular registration 18a of the nut 18, i being the number of rollers 22 and recesses 45 between 1 and n. Once the first roller 22, mounted in the ring 34, is positioned the mounting tool 70 around the nut 18 so that the notch 72b cooperates with the rib 18b of the nut 18. Thus, the visual means angular registration '76, the mounting tool 70 is in the same angular position as the visual means of angular registration 60, the first roller 22, and the visual means of angular registration 18a of the nut 18 Then all the other rollers 22 are positioned in the angular positions corresponding to the angular positions of the angular registration visual means 76f of the mounting tool 70. Thanks to the invention, it is possible to easily mount the rollers in the nut through the visual means of angular registration practiced on each of the rollers and the nut. This provides a mounting method for easy indexing and automatic rollers in the nut.
    权利要求:
    Claims (11)
    [0001]
    REVENDICATIONS1. A roller screw mechanism comprising a screw (12) having an external thread (16), a nut (18) disposed around and coaxially with said screw (12), the nut (18) having an internal thread (20), and a plurality of identical rollers (22) interposed between said screw (12) and said nut (18) and each having an external thread (24) engaged with the outer and inner threads (16, 20) of said screw (12). ) and said nut (18), the thread (24) of each roller (22) being axially extended at each end by a toothing (26, 28) which is itself extended axially by a cylindrical pin (30, 32). extending outwardly, the roller screw mechanism (10) further comprising two annular rings (34,36) secured in an unthreaded portion of the bore of the nut (18) and each having a toothing therein (38, 40) respectively engaged with the toothing (26, 28) of the rollers (22) and two ba annular guides (42, 44) each mounted radially between the associated screw (12) and crown (34, 36) and comprising a plurality of continuous cylindrical recesses (43, 45) evenly distributed in the circumferential direction and interior of which the trunnions (30, 32) of the rollers (22) are housed, characterized in that each of the rollers (22) comprises a visual angular registration means (60, 62) and the nut (18) comprises a means visual angular registration (18a) for angularly placing the rollers (22) in the ring (34).
    [0002]
    The roller screw mechanism according to claim 1, wherein the angular registration visual means (60, 62) of the rollers (22) is made outside the thread (24).
    [0003]
    A roller screw mechanism according to claim 2, wherein the angular registration visual means (60, 62) of the rollers (22) is formed on the radial lateral surface (26a) or the cylindrical axial surface (26b) of one of the teeth (26).
    [0004]
    The roller screw mechanism according to claim 2, wherein the angular registration visual means (60, 62) of the rollers (22) is formed on the lateral radial surface (30a) or the cylindrical axial surface (30b) of one of the journals (30).
    [0005]
    A roller screw mechanism according to any one of the preceding claims, wherein the angular registration visual means (18a) of the nut (18) is formed on the lateral radial surface of the nut (18).
    [0006]
    A roller screw mechanism according to any one of the preceding claims, wherein the angular registration visual means (60, 62, 18a) is deformation, machining or marking.
    [0007]
    A roller screw mechanism according to any one of the preceding claims, wherein the angular registration visual means (60, 62) of the rollers (22) is formed prior to threading the roll (22).
    [0008]
    A mounting tool (70) capable of mounting rollers (22) in a roller screw mechanism (10) according to any one of the preceding claims, comprising an annular body (72) having a cylindrical bore (72a) therethrough having an inner diameter greater than the outer diameter of the nut (18) and a plurality of cylindrical recesses (74) extending uniformly circumferentially and each having a visual angular registration means (76) for each of the rollers (22), the mounting tool comprising at its cylindrical bore (72a), a notch (72b) for cooperating with a rib (18b) of the nut (18) to angularly position the tool relative to the nut.
    [0009]
    9. A method of mounting the rollers in a roller screw mechanism (10) according to any one of claims 1 to 7, wherein: - is positioned a first roller (22) in the associated recess (45,) one of the annular rings (44) so that the angular position visual means (60,) of the first roller (22,) is aligned with the angular position visual means (18a) of the nut (18). ); and said first roll (22) is rotated on itself until the adjacent recess (45, +,) in the annular ring (44) is at the angular position visual means ( 18a) of the nut (18).
    [0010]
    10. Mounting method according to claim 9, wherein a second roller (22, +,) is positioned in the associated recess (45, +,) of the annular ring (45) so that the visual means of angular position (60, +,) of the second roller (22, +,) is aligned with the visual angular position means (18a) of the nut (18); and - said second roll (22, +,) is rotated on itself until the adjacent recess (45, + 2) in the annular ring (44) is at the positional visual means angular (18a) of the nut (18) and repeating the step of introduction and rotation for each of the rollers (22e).
    [0011]
    11. Mounting method according to claims 8 and 9, wherein, after mounting the first roller (22) in the ring (34), the mounting tool (70) is positioned around the nut (18). in such a way that the notch (72b) cooperates with the rib (18b) of the nut (18) and all the other rollers (22) are positioned in the angular positions corresponding to the angular positions of the visual means of angular registration ( 76) of the mounting tool (70).
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    同族专利:
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    引用文献:
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    法律状态:
    2015-02-27| PLFP| Fee payment|Year of fee payment: 2 |
    2016-02-29| PLFP| Fee payment|Year of fee payment: 3 |
    2017-02-24| PLFP| Fee payment|Year of fee payment: 4 |
    2018-02-27| PLFP| Fee payment|Year of fee payment: 5 |
    2019-02-27| PLFP| Fee payment|Year of fee payment: 6 |
    2020-02-20| PLFP| Fee payment|Year of fee payment: 7 |
    2021-11-12| ST| Notification of lapse|Effective date: 20211005 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1451201A|FR3017678B1|2014-02-14|2014-02-14|ROLLER SCREW, METHOD AND TOOL FOR MOUNTING ROLLS IN SUCH ROLLER SCREW|FR1451201A| FR3017678B1|2014-02-14|2014-02-14|ROLLER SCREW, METHOD AND TOOL FOR MOUNTING ROLLS IN SUCH ROLLER SCREW|
    CN201510042352.8A| CN104847860B|2014-02-14|2015-01-28|Roller screw, method and tool for installing roller in the roller screw|
    DE102015101509.9A| DE102015101509A1|2014-02-14|2015-02-03|Roller screw drive, method and tool for mounting the rollers in such a roller screw drive|
    US14/620,934| US9709140B2|2014-02-14|2015-02-12|Roller screw, mounting method and tool for fitting rollers in such a roller screw|
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