WO2020216886A1 - System for power transmission between two shafts separated by an intermediate member - Google Patents

System for power transmission between two shafts separated by an intermediate member Download PDF

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Publication number
WO2020216886A1
WO2020216886A1 PCT/EP2020/061425 EP2020061425W WO2020216886A1 WO 2020216886 A1 WO2020216886 A1 WO 2020216886A1 EP 2020061425 W EP2020061425 W EP 2020061425W WO 2020216886 A1 WO2020216886 A1 WO 2020216886A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission system
intermediate member
track
transmission
rolling
Prior art date
Application number
PCT/EP2020/061425
Other languages
French (fr)
Inventor
Louis REDOUTEY
Sylvain TODESCHINI
Original Assignee
Ntn-Snr Roulements
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ntn-Snr Roulements filed Critical Ntn-Snr Roulements
Publication of WO2020216886A1 publication Critical patent/WO2020216886A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • 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
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/008—Systems with a plurality of bearings, e.g. four carriages supporting a slide on two parallel rails
    • 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
    • F16C29/00—Bearings for parts moving only linearly
    • F16C29/04—Ball or roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C31/00—Bearings for parts which both rotate and move linearly
    • F16C31/04—Ball or roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H19/00—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion
    • F16H19/02—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion
    • F16H19/04—Gearings comprising essentially only toothed gears or friction members and not capable of conveying indefinitely-continuing rotary motion for interconverting rotary or oscillating motion and reciprocating motion comprising a rack
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H2025/204—Axial sliding means, i.e. for rotary support and axial guiding of nut or screw shaft

Definitions

  • the invention relates to a power transmission system, and more particularly a power transmission system between two shafts, an input shaft and an output shaft, the transmission system allowing a high torque reduction of the 'output shaft relative to the input shaft.
  • the power transmission systems between two shafts are generally configured to integrate several reduction stages when it is desired to obtain a high gear reduction at the output.
  • Applications of such transmission systems requiring significant efforts are found in the automotive field for example, such as actuators for heavy goods vehicles.
  • a power transmission system between an input shaft movable in rotation about a first reference axis, and an output shaft movable in rotation about a second axis of reference, the transmission system comprising an intermediate member driven in translation along the first axis by the input shaft by means of a first screw-nut type transmission, and rotating the output shaft by means of a second toothed transmission.
  • This transmission system is used in particular for automotive power steering.
  • the invention aims to remedy all or part of the drawbacks of the state of the art by proposing in particular a compact power transmission system, particularly resistant, compatible with large loads and making it possible to ensure a high reduction in the torque between input and output members.
  • a power transmission system between an input member movable in rotation, preferably without translation, about a first reference axis, and a member output mobile in rotation, preferably without translation, around a second reference axis, the first and second axes being non-coplanar
  • the transmission system comprising an intermediate member driven by the input member in translation with respect to this said input member along the first axis by means of a first transmission of the helical link type, and driving the output member in rotation by means of a second toothed transmission
  • the transmission system being remarkable in that it comprises at least a first pad provided with rolling bodies for rolling on a first track of the intermediate member and configured to be disposed between the first track of the intermediate member and a first track fixed so as to ensure a resumption of forces, in particular the forces resulting from the second toothed transmission.
  • the use of the first pad allows the resumption of the forces exerted by the power transmission system on the intermediate member, consequently limiting the stresses applied to the input member, for example a shaft of Entrance.
  • the first track is oriented in a direction opposite to the second transmission.
  • the first shoe rolling on the intermediate member, opposite the second toothed transmission, makes it possible to take up the forces of this link, the main component of which is oriented orthogonally with respect to the first reference axis, the axial forces being taken up directly by the first transmission of the helical link type.
  • the first track of the intermediate member is located on a side opposite the second reference axis with respect to a plane containing the first reference axis and parallel to the second reference axis.
  • the transmission system comprises a second pad provided with rolling bodies for rolling on a second track of the intermediate member and configured to be disposed between the second track of the intermediate member and a second fixed track of so as to ensure the absorption of the forces, in particular the forces exerted by the second toothed transmission.
  • a second pad provided with rolling bodies for rolling on a second track of the intermediate member and configured to be disposed between the second track of the intermediate member and a second fixed track of so as to ensure the absorption of the forces, in particular the forces exerted by the second toothed transmission.
  • the transmission system can include more than two pads.
  • a transmission system provided with two pads offers a good compromise with the distribution of the forces into several pads.
  • This plurality of pads is preferably configured to ensure the absorption of forces regardless of the direction of operation of the transmission system.
  • friction torques induce different forces.
  • at least the first pad allows the absorption of forces in a direct direction and the second pad allows the absorption of forces in an indirect direction, opposite to the direct direction of operation of the transmission system.
  • the first and second tracks of the intermediate member are preferably separate. This offers a better distribution of the resumed efforts.
  • the first track has a first associated rolling surface
  • the second track has an associated second rolling surface
  • the first and second rolling surfaces being coplanar, preferably coplanar in a parallel rolling plane to the first reference axis and to the second reference axis. This improves the efficiency of the absorption of radial forces in relation to the input member.
  • the first and second rolling surfaces are located on either side of a separation plane perpendicular to the rolling plane and containing the first reference axis, the first and second rolling surfaces preferably being symmetrical with respect to this plane of separation.
  • the first transmission forming a helical link is subjected to a friction torque pressing the first pad against the first track provided for this purpose, and allows the resumption of radial forces.
  • the friction torque is exerted in an opposite direction of rotation and presses the second pad against the second track.
  • the operating clearance between a pad and its associated track, against which the pad comes into contact is of the order of 1 to 10 ⁇ m.
  • the skate comprises a plurality of rolling bodies held in a cage.
  • the rolling bodies are cylindrical needles. It will be noted that other alternatives are possible.
  • the rolling bodies can include rollers or balls.
  • the rollers may have barrel-shaped cylindrical or conical shapes.
  • the bearing is subjected to forces orthogonal to the rolling track which receives it. These forces are applied heterogeneously on the shoe or pads as a function of the friction torque on the one hand, and the position of the shoes with respect to the force which is taken up.
  • the use of a plurality of pads, in particular a first and a second pad makes it possible to reduce the size of each of the pads and consequently, that of the needles.
  • the transmission system comprises synchronization elements so that the bearing of the first pad is synchronous with the bearing of the second pad.
  • the synchronization elements comprise mechanical connecting elements such as at least one rod connecting the two pads, an interweaving of shapes between the two pads or a bonding.
  • the synchronization elements comprise electromagnetic link elements.
  • the first transmission of the helical connection type is formed by an engagement between a threaded rod, such as a screw, of the input member and a nut formed by the intermediate member, forming thus a screw-nut device, with or without interposition of balls, the screw-nut device becoming a ball screw in the event of interposition of balls.
  • the second transmission is formed by a rack of the intermediate member and of a pinion of the output member meshing with the rack.
  • the intermediate member comprises a threaded hole through which the inlet member passes.
  • the transmission system is configured so that the first pad, or the first track, and the tapped hole are spaced between them by a sufficient distance so that none of these elements are intersecting one with the other.
  • the tapped hole and the first pad are preferably positioned in their respective integrals on either side of a plane parallel to the two reference axes.
  • the tapped hole and the second reference axis are preferably positioned on either side of a plane parallel to the two reference axes.
  • the tapped hole is thus preferably positioned between two planes parallel to the reference axis, separating it on the one hand from the pad (s) and on the other hand from the second transmission.
  • first track and the second track are located on either side of the threaded hole made in the intermediate member and located in a plane containing the first reference axis, or close to it , and parallel to the second reference axis.
  • Such a configuration has the particular advantage of reducing the total thickness of the mechanism.
  • the intermediate member is in one piece, that is to say formed in one piece.
  • it can be made up of two or more pieces, joined together.
  • the rack and the nut are formed by at least two separate parts of the intermediate member, fixed relative to each other.
  • FIG. 1 a perspective view of a transmission system according to a first embodiment, illustrated without a bearing support;
  • FIG. 2 a perspective view of a complete transmission system according to this first embodiment
  • FIG. 3 a view of the first and second pads according to this first embodiment
  • FIG. 4 a view of the intermediate member and of the first and second tracks according to this first embodiment
  • FIG. 5 a view of the intermediate member and of the teeth of the second toothed transmission according to this first embodiment
  • FIG. 6 a front view of the transmission system according to this first embodiment
  • FIG. 7 a sectional view A-A of FIG. 6;
  • FIG. 8 a sectional view B-B of FIG. 6;
  • FIG. 9 a perspective view of a transmission system according to a second embodiment, illustrated without a bearing support
  • FIG. 10 a perspective view of a complete transmission system according to this second embodiment
  • FIG. 11 a view of the first and second pads according to this second embodiment
  • FIG. 12 a view of the intermediate member and of the first and second tracks according to this second embodiment
  • FIG. 13 a view of the intermediate member and of the teeth of the second toothed transmission according to this second embodiment
  • FIG. 14 a front view of the transmission system according to this second embodiment
  • FIG. 15 a sectional view A '-A' of FIG. 14;
  • FIG. 16 a sectional view B'-B 'of FIG. 14;
  • FIG. 17 a perspective view of a transmission system according to a third embodiment, illustrated without a bearing support;
  • FIG. 18 a perspective view of a transmission system according to this third embodiment without a bearing support
  • FIG. 19 a front view of the transmission system according to this third embodiment
  • FIG. 20 a sectional view A ”-A” of figure 19.
  • FIG. 1 to 8 is illustrated a power transmission system 10 according to a first embodiment.
  • the power transmission system 10 of the actuator type makes it possible to transmit power between an input member 20 movable in rotation about a first reference axis X and an output member 30 movable in rotation about a second reference axis X '.
  • the input 20 and output 30 members take the form of input and output shafts in the modes illustrated in the figures.
  • the first and second axes X, X ' are not parallel or intersecting. They are not coplanar.
  • the two input 20 and output 30 shafts are orthogonal.
  • the transmission system 10 comprises an intermediate member 40, located in series on the kinematic chain between the input 20 and output shafts 30.
  • the intermediate member 40 is driven in translation along the first axis X by the input shaft 20 by means of a first screw-nut type transmission 50, generally forming a helical connection.
  • the intermediate member 40 is configured to drive the output shaft 30 in rotation by means of a second toothed transmission 60.
  • the first transmission 50 of the screw-nut or ball screw type is formed here by an engagement between a threaded rod, such as a screw, of the input shaft 20 and of a nut formed by the intermediate member 40.
  • the screw has a thread extending helically coaxially with the first reference axis X.
  • the thread of the screw is not shown here in order to simplify the reading of the figures.
  • This thread of the screw rotates in a threaded hole 43 formed in the intermediate member 40 forming a nut, coaxial with the reference axis X, the input shaft 20 provided with the screw passing through the threaded hole 43.
  • a such a configuration allows the forces to be taken up by reducing the action exerted by the output shaft 30 on the input shaft 20 via the intermediate member.
  • This screw-nut connection 50 allows a transformation of the input rotational movement into translation.
  • the second transmission 60 illustrated in these Figures 1 to 8 is further formed by a rack 44 integral with the intermediate member 40 and a pinion (not shown) integral with the output shaft 30 meshing with the rack 44.
  • a gear is particularly suitable for heavy loads.
  • the rotation of the input shaft 20 around its first reference axis X causes the rotation of the screw in one direction, the helical toothing of which meshes with an internal toothing of the hole thread 43 of the intermediate member 40 causing the translation of this intermediate member 40 along this axis X.
  • This movement simultaneously causes the displacement of the teeth of the rack 44, which is integral with the intermediate member 40 moving in turn the pinion projecting radially with respect to the output shaft 30 of which it is integral, the pinion meshing with the rack 44.
  • the intermediate member 40 is in one piece, preferably in one piece. Such a design is simplified, easy to machine, therefore allowing precise functional dimensions, and less expensive.
  • the transmission system 10 comprises: a first pad 71 provided with rolling bodies 73 for rolling on a first track 41 of the intermediate member 40 and configured to be disposed between the first track 41 of the intermediate member 40 and a first fixed raceway 81 of a fixed structure 80; a second shoe 72 provided with rolling bodies 73 for rolling on a second track 42 of the intermediate member 40 and configured to be disposed between the second track 42 of the intermediate member 40 and a second fixed raceway 82.
  • first and second pads 71, 72 allow the resumption of the forces generated by the second transmission, 60 these being pressed against the fixed structure 80 relative to the transmission system such as a casing integral with a frame, or a rail dedicated to the recovery of forces.
  • the efforts of the second transmission 60 tend to push the intermediate member 40 radially relative to the first axis X.
  • the first and second pads 71, 72 are intended to oppose this force to release the shaft d entry 20 of these radial constraints.
  • the first and second pads 71, 72 are both formed of a plurality of rolling bodies 73 held in a cage 74, the rolling bodies 73 being in the form of cylindrical needles.
  • the first and second pads 71, 72 are distant from each other so that the first and second tracks 41, 42 of the intermediate member 40 on which they run respectively are separate from one of the other.
  • the transmission system 10 comprises synchronization elements 75 so that the bearing of the first pad 71 is synchronous with the bearing of the second pad 72.
  • the synchronization elements 75 take the form of mechanical connecting elements connecting the first and second pads 71, 72 between them.
  • These mechanical elements here comprise a plurality of rods 751 forming a trellis 752, this trellis being integral with the two cages 74 of the first and second pads 71, 72, and in particular formed in one piece and in one piece with these cages 74.
  • one-piece piece is relatively strong and easy to manufacture while allowing the first and second pads 71, 72 to be secured to one another during their movement.
  • the synchronization elements 75 aim to reduce the risk of premature wear and to ensure the correct positioning of the free shoe relative to the shoe under stress.
  • the first and second tracks 41, 42 are oriented in a direction opposite to the second transmission 60 so as to improve the absorption of the forces from the second transmission 60, the main component of which is oriented generally in a plane orthogonal to the X axis input shaft.
  • the intermediate member 40 takes the form of a parallelepiped having on one face, the raceway or tracks 41, 42 and on an opposite face, the rack 44. Between these two faces of the intermediate member, is located the threaded hole 43 configured to accommodate the input shaft 20, the axial threaded hole 43 being opening on two other distinct faces and opposite two by two.
  • a plane Q1 can be drawn parallel to the two reference axes, on one side of which is the threaded hole 43, and on the other side are the raceway (s) 41, 42 as well as the pads 71, 72.
  • Each of the first and second tracks 41, 42 has a first and a second running surface 41 ', 42' with which it is associated respectively.
  • These rolling surfaces 41 ', 42' on which the rolling bodies 73 roll are bordered continuously or discontinuously by one or more flanges 45 projecting from these rolling surfaces 41 ', 42' thus allowing good guidance.
  • the pads 71, 72 can be guided by guide means which are specific to them, each pad being guided independently of the other or else, if the pads are integral with one another, they can be guided by common guide means, as is the case for this first embodiment with the flanges 45.
  • Such flanges 45 are also provided at the ends of each of the first and second tracks 41, 42 to form stops at the end of run of the pads 71, 72.
  • These flanges 45 therefore have a dual function, on the one hand a function of guiding the pads 71, 72, in particular when they are arranged on either side of the tracks 41, 42, and on the other hand, a function of retaining said pads 71, 72, in particular when they are located at each end of the tracks 41, 42 so as to form end-of-stroke stops of the pads 71, 72, the roller pads 71, 72 making round trips on tracks 41, 42 on all or one fraction of their lengths.
  • the first and second rolling surfaces 41 ', 42' are coplanar and located in a running plane Pr, the first reference axis X and the second reference axis X 'each being parallel to this running plane Pr.
  • the first and second rolling surfaces 41 ', 42' are located on either side of a separation plane Ps perpendicular to the running plane Pr and containing the first reference axis X, the first and second surfaces 41 ′, 42 ′ of the bearing being furthermore symmetrical with respect to this plane of separation Ps.
  • the first transmission 50 of the screw-nut or ball screw type is subjected to a frictional torque pressing the first pad 71 against the first track 41 provided for this purpose, and allows the resumption of radial forces.
  • the friction torque is exerted in an opposite direction of rotation and presses the second pad 72 against the second track 42.
  • a plurality of pads 71, 72 ensures a better distribution of the absorption of the forces in different zones, and also allows, depending on its arrangement, a better absorption of the forces on the transmission system 10 whose movements are alternate. Indeed, the parts are movable in a direct direction and a indirect direction, reversed compared to the direct direction, and the different directions correspond to different paths for the efforts.
  • the running plane Pr is distant from the first reference axis X by a distance d greater than the radius r of a thread base of the taps of the tapped hole 43.
  • FIG. 9 to 16 is illustrated a power transmission system 10 according to a second embodiment.
  • This second embodiment differs essentially from the first in that the synchronization elements 75 between the first and second pads 71, 72 take the form of mechanical connecting elements connecting the first and second pads 71, 72 to each other, these mechanical elements comprising a connecting rod 753 having two ends 753 ', each of these ends 753' being clipped to one and the other of the cage 74 of the pad 71, 72 with which the end is associated.
  • each pad is guided independently of the other by the flanges 45.
  • Figures 17 to 20 is illustrated a power transmission system according to a third embodiment.
  • This third embodiment differs essentially from the first in that the intermediate member 40 is not formed in one piece or in one piece unlike the first and second embodiments described above, but it is formed in two parts.
  • the intermediate member 40 comprises: a first part 40A forming the nut and having the threaded hole 43 which passes through it to accommodate the screw carried by the input shaft 20, similarly to the first and second modes of production ; and, a second part 40B forming an outer part of the intermediate member 40, carrying on one side the rack 44 and on the other side, the first and second bearing tracks 41, 42.
  • the second part 40B of the intermediate member 40 comprises an intermediate bore 46 delimiting a space to accommodate the first inner part 40A, the outer shape of the first inner part 40A being substantially complementary to the inner shape of the intermediate bore 46 inside which the first part 40B is housed.
  • the fixing of the first part 40A to the second part 40B is provided by two circlips 47 arranged at each end of the intermediate bore 46 to block in translation the first and second parts 40A, 40B with one another .
  • the rotational locking of the first and second parts 40A, 40B is ensured by a key 48 configured to be interposed between a groove of the first part 40A disposed on its cylindrical outer casing and open radially towards the second part 40B and a notch of the second part 40B disposed on the contour of the bore 46, open towards the interior of the intermediate bore 46, in particular towards the first part 40A in the assembled position.
  • the rotational connection between the two parts 40A, 40B is effective when the key is engaged both in the groove of the first part 40A and in the notch of the second part 40B.
  • any translational and / or rotational connection means may be used to connect the two parts 40A, 40B together forming the intermediate member 40.
  • the number of pads can vary, the transmission system being able to integrate more than two pads.
  • the first transmission of the helical link type, of the screw-nut type in particular can also be a ball screw mechanism, that is to say a mechanism comprising balls positioned between the thread of the screw and that of the nut, as well as a recirculation path for these balls.
  • a ball screw mechanism that is to say a mechanism comprising balls positioned between the thread of the screw and that of the nut, as well as a recirculation path for these balls.

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  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

The invention relates to a system for power transmission (10) between an input member (20) which can be moved in rotation about a first reference axis (X) and an output member (30) which can be moved in rotation about a second reference axis (X'), the first and second axes (X, X') not being coplanar, the transmission system (10) comprising an intermediate member (40) which is translated by the input member (20) in relation to said input member (20) along the first axis (X) by means of a first helical connection transmission (50), and rotating the output member (30) by means of a second toothed transmission (60), the transmission system (10) being characterised in that it comprises at least a first runner (71) which is provided with rolling members (73) in order to roll on a first track (41) of the intermediate member (40) and which is configured to be arranged between the first track (41) of the intermediate member (40) and a first rolling path (81) which is fixed so as to ensure forces are taken up.

Description

DESCRIPTION DESCRIPTION
TITRE : SYSTEME DE TRANSMISSION DE PUISSANCE ENTRE DEUX ARBRES SÉPARÉS PAR TITLE: POWER TRANSMISSION SYSTEM BETWEEN TWO SHAFTS SEPARATED BY
UN ORGANE INTERMEDIAIRE AN INTERMEDIATE BODY
DOMAINE TECHNIQUE DE L'INVENTION TECHNICAL FIELD OF THE INVENTION
[0001] L'invention concerne un système de transmission de puissance, et plus particulièrement un système de transmission de puissance entre deux arbres, un arbre d'entrée et un arbre de sortie, le système de transmission permettant une forte démultiplication du couple de l'arbre de sortie par rapport à l'arbre d'entrée. The invention relates to a power transmission system, and more particularly a power transmission system between two shafts, an input shaft and an output shaft, the transmission system allowing a high torque reduction of the 'output shaft relative to the input shaft.
ÉTAT DE LA TECHNIQUE ANTÉRIEURE STATE OF THE PRIOR ART
[0002] De manière connue, les systèmes de transmission de puissance entre deux arbres sont généralement configurés pour intégrer plusieurs étages de réduction lorsqu'il est souhaité d'obtenir une forte démultiplication en sortie. On trouve des applications de tels systèmes de transmission nécessitant des efforts importants dans le domaine automobile par exemple, comme des actionneurs pour des poids-lourds. In known manner, the power transmission systems between two shafts are generally configured to integrate several reduction stages when it is desired to obtain a high gear reduction at the output. Applications of such transmission systems requiring significant efforts are found in the automotive field for example, such as actuators for heavy goods vehicles.
[0003] On connaît par exemple du document US4175475A, un système de transmission de puissance entre un arbre d'entrée mobile en rotation autour d'un premier axe de référence, et un arbre de sortie mobile en rotation autour d'un deuxième axe de référence, le système de transmission comprenant un organe intermédiaire entraînée en translation selon le premier axe par l'arbre d'entrée au moyen d'une première transmission de type vis écrou, et entraînant en rotation l'arbre de sortie au moyen d'une deuxième transmission dentée. Ce système de transmission est utilisé notamment pour des directions assistées automobiles. Known for example from document US4175475A, a power transmission system between an input shaft movable in rotation about a first reference axis, and an output shaft movable in rotation about a second axis of reference, the transmission system comprising an intermediate member driven in translation along the first axis by the input shaft by means of a first screw-nut type transmission, and rotating the output shaft by means of a second toothed transmission. This transmission system is used in particular for automotive power steering.
[0004] Toutefois, une telle disposition est efficace lorsque les première et deuxième transmissions ne sont pas exposées à de trop fortes charges. En effet, les efforts appliqués sur la liaison par engrenage de l'ensemble vis-écrou, notamment ceux issus de la liaison assurée par la deuxième transmission dentée, peuvent être très importants et peuvent ne pas être supportés par l'arbre d'entrée ou une de ses pièces ou organes attenants sans un dimensionnement adéquat de l'un, ou de l'ensemble, de ces éléments, impliquant un encombrement important, du fait de ces contraintes. [0004] However, such an arrangement is effective when the first and second transmissions are not exposed to excessive loads. Indeed, the forces applied to the gear connection of the screw-nut assembly, in particular those resulting from the connection provided by the second toothed transmission, can be very large and may not be supported by the input shaft or one of his pieces or adjoining components without adequate sizing of one or all of these elements, involving a significant bulk, due to these constraints.
EXPOSE DE L'INVENTION DISCLOSURE OF THE INVENTION
[0005] L'invention vise à remédier à tout ou partie des inconvénients de l'état de la technique en proposant notamment un système de transmission de puissance compact, particulièrement résistant, compatible avec des charges importantes et permettant d'assurer une forte démultiplication du couple entre les organes d'entrée et de sortie. [0005] The invention aims to remedy all or part of the drawbacks of the state of the art by proposing in particular a compact power transmission system, particularly resistant, compatible with large loads and making it possible to ensure a high reduction in the torque between input and output members.
[0006] Pour ce faire est proposé, selon un aspect de l'invention, un système de transmission de puissance entre un organe d'entrée mobile en rotation, de préférence sans translation, autour d'un premier axe de référence, et un organe de sortie mobile en rotation, de préférence sans translation, autour d'un deuxième axe de référence, les premier et deuxième axes étant non coplanaires, le système de transmission comprenant un organe intermédiaire entraîné par l'organe d'entrée en translation par rapport à ce dit organe d'entrée selon le premier axe au moyen d'une première transmission de type liaison hélicoïdale, et entraînant en rotation l'organe de sortie au moyen d'une deuxième transmission dentée, le système de transmission étant remarquable en ce qu'il comprend au moins un premier patin muni de corps roulants pour rouler sur une première piste de l'organe intermédiaire et configuré pour être disposé entre la première piste de l'organe intermédiaire et un premier chemin de roulement fixe de sorte à assurer une reprise d'efforts, notamment les efforts issus de la deuxième transmission dentée. To do this is proposed, according to one aspect of the invention, a power transmission system between an input member movable in rotation, preferably without translation, about a first reference axis, and a member output mobile in rotation, preferably without translation, around a second reference axis, the first and second axes being non-coplanar, the transmission system comprising an intermediate member driven by the input member in translation with respect to this said input member along the first axis by means of a first transmission of the helical link type, and driving the output member in rotation by means of a second toothed transmission, the transmission system being remarkable in that it comprises at least a first pad provided with rolling bodies for rolling on a first track of the intermediate member and configured to be disposed between the first track of the intermediate member and a first track fixed so as to ensure a resumption of forces, in particular the forces resulting from the second toothed transmission.
[0007] L'utilisation du premier patin permet la reprise des efforts exercés par le système de transmission de puissance sur l'organe intermédiaire, limitant par conséquent les contraintes s'appliquant sur l'organe d'entrée, par exemple un arbre d'entrée. [0007] The use of the first pad allows the resumption of the forces exerted by the power transmission system on the intermediate member, consequently limiting the stresses applied to the input member, for example a shaft of Entrance.
[0008] Selon une caractéristique technique avantageuse, la première piste est orientée dans une direction opposée à la deuxième transmission. Le premier patin roulant sur l'organe intermédiaire, opposé à la deuxième transmission dentée, permet de reprendre les efforts de cette liaison dont la composante principale est orientée orthogonalement par rapport au premier axe de référence, les efforts axiaux étant repris directement par la première transmission de type liaison hélicoïdale. [0008] According to an advantageous technical characteristic, the first track is oriented in a direction opposite to the second transmission. The first shoe rolling on the intermediate member, opposite the second toothed transmission, makes it possible to take up the forces of this link, the main component of which is oriented orthogonally with respect to the first reference axis, the axial forces being taken up directly by the first transmission of the helical link type.
[0009] Selon une caractéristique particulière, la première piste de l'organe intermédiaire est située d'un côté opposé au deuxième axe de référence par rapport à un plan contenant le premier axe de référence et parallèle au deuxième axe de référence. [0009] According to one particular characteristic, the first track of the intermediate member is located on a side opposite the second reference axis with respect to a plane containing the first reference axis and parallel to the second reference axis.
[0010] Avantageusement, le système de transmission comprend un deuxième patin muni de corps roulants pour rouler sur une deuxième piste de l'organe intermédiaire et configuré pour être disposé entre la deuxième piste de l'organe intermédiaire et un deuxième chemin de roulement fixe de sorte à assurer la reprise des efforts, notamment les efforts exercés par la deuxième transmission dentée. Une telle caractéristique permet de réduire la reprise d'efforts par patin et de les répartir sur plusieurs patins compte tenu des jeux nécessaires au fonctionnement, l'un des patins supportant la reprise d'effort majoritairement dans un sens de déplacement aller, et l'autre un sens de déplacement retour. Advantageously, the transmission system comprises a second pad provided with rolling bodies for rolling on a second track of the intermediate member and configured to be disposed between the second track of the intermediate member and a second fixed track of so as to ensure the absorption of the forces, in particular the forces exerted by the second toothed transmission. Such a characteristic makes it possible to reduce the absorption of forces per shoe and to distribute them over several shoes taking into account the clearances necessary for operation, one of the shoes supporting the absorption of force mainly in one direction of forward movement, and the another one direction of return movement.
[0011] Bien entendu, le système de transmission peut comporter plus de deux patins. Cependant, pour des raisons de simplification, de réduction des coûts et d'encombrement, un système de transmission muni de deux patins offre un bon compromis avec la répartition des efforts en plusieurs patins. Cette pluralité de patins est de préférence configurée pour assurer la reprise des efforts quel que soit le sens de fonctionnement du système de transmission. En effet, en fonction du sens de rotation de l'organe d'entrée, et donc des pièces qui lui succèdent sur la chaîne cinématique, des couples de frottement induisent des efforts différents. Dans ce cas, au moins le premier patin permet la reprise des efforts dans un sens direct et le deuxième patin permet la reprise des efforts dans un sens indirect, opposé au sens direct de fonctionnement du système de transmission. [0011] Of course, the transmission system can include more than two pads. However, for reasons of simplification, cost reduction and size, a transmission system provided with two pads offers a good compromise with the distribution of the forces into several pads. This plurality of pads is preferably configured to ensure the absorption of forces regardless of the direction of operation of the transmission system. In fact, depending on the direction of rotation of the input member, and therefore of the parts which follow it on the kinematic chain, friction torques induce different forces. In this case, at least the first pad allows the absorption of forces in a direct direction and the second pad allows the absorption of forces in an indirect direction, opposite to the direct direction of operation of the transmission system.
[0012] Selon cette configuration, les première et deuxième pistes de l'organe intermédiaire sont de préférence distinctes. Cela offre une meilleure répartition des efforts repris. [0013] Suivant un mode de réalisation, la première piste présente une première surface de roulement associée, la deuxième piste présente une deuxième surface de roulement associée, les première et deuxième surfaces de roulement étant coplanaires, de préférence coplanaires dans un plan de roulement parallèle au premier axe de référence et au deuxième axe de référence. Cela améliore l'efficacité de la reprise des efforts radiaux par rapport à l'organe d'entrée. [0012] According to this configuration, the first and second tracks of the intermediate member are preferably separate. This offers a better distribution of the resumed efforts. [0013] According to one embodiment, the first track has a first associated rolling surface, the second track has an associated second rolling surface, the first and second rolling surfaces being coplanar, preferably coplanar in a parallel rolling plane to the first reference axis and to the second reference axis. This improves the efficiency of the absorption of radial forces in relation to the input member.
[0014] Dans une configuration technique avantageuse, les première et deuxième surfaces de roulement sont situées de part et d'autre d'un plan de séparation perpendiculaire au plan de roulement et contenant le premier axe de référence, les première et deuxième surfaces de roulement étant de préférence symétriques par rapport à ce plan de séparation. In an advantageous technical configuration, the first and second rolling surfaces are located on either side of a separation plane perpendicular to the rolling plane and containing the first reference axis, the first and second rolling surfaces preferably being symmetrical with respect to this plane of separation.
[0015] Durant l'utilisation du système de transmission, la première transmission formant liaison hélicoïdale est soumise à un couple de frottement plaquant le premier patin contre la première piste prévue à cet effet, et autorise la reprise des efforts radiaux. Lorsque l'actionnement est inversé, le couple de frottement s'exerce dans un sens de rotation opposé et vient plaquer le deuxième patin contre la deuxième piste. Par exemple, le jeu de fonctionnement entre un patin et sa piste associée, contre laquelle le patin vient en contact, est de l'ordre de 1 à 10 pm. During use of the transmission system, the first transmission forming a helical link is subjected to a friction torque pressing the first pad against the first track provided for this purpose, and allows the resumption of radial forces. When the actuation is reversed, the friction torque is exerted in an opposite direction of rotation and presses the second pad against the second track. For example, the operating clearance between a pad and its associated track, against which the pad comes into contact, is of the order of 1 to 10 μm.
[0016] Suivant un mode de réalisation, le patin comporte une pluralité de corps roulants maintenus dans une cage. [0016] According to one embodiment, the skate comprises a plurality of rolling bodies held in a cage.
[0017] Suivant un mode de réalisation, les corps roulants sont des aiguilles cylindriques. On notera que d'autres alternatives sont possibles. Par exemple, les corps roulants peuvent comprendre des rouleaux ou des billes. Par ailleurs les rouleaux peuvent présenter des formes cylindriques en tonnelets, ou coniques. [0018] On notera que le roulement est soumis à des efforts orthogonaux à la piste de roulement qui l'accueille. Ces efforts s'appliquent de façon hétérogène sur le ou les patins en fonction du couple de frottement d'une part, et de la position des patins par rapport à l'effort qui est repris. L'utilisation d'une pluralité de patins, notamment d'un premier et d'un deuxième patin, permet de réduire la dimension de chacun des patins et par voie de conséquence, celle des aiguilles. On comprend que les efforts qui sont repris sur les aiguilles sont hétérogènes sur l'étendue longitudinale de l'aiguille ce qui conduit à une usure non homogène de ces aiguilles. La réduction de la longueur des aiguilles permet de réduire les effets indésirables de cette usure. [0019] Suivant un mode de réalisation, le système de transmission comprend des éléments de synchronisation de sorte que le roulement du premier patin soit synchrone avec le roulement du deuxième patin. [0017] According to an embodiment, the rolling bodies are cylindrical needles. It will be noted that other alternatives are possible. For example, the rolling bodies can include rollers or balls. Furthermore, the rollers may have barrel-shaped cylindrical or conical shapes. It will be noted that the bearing is subjected to forces orthogonal to the rolling track which receives it. These forces are applied heterogeneously on the shoe or pads as a function of the friction torque on the one hand, and the position of the shoes with respect to the force which is taken up. The use of a plurality of pads, in particular a first and a second pad, makes it possible to reduce the size of each of the pads and consequently, that of the needles. It will be understood that the forces which are taken up on the needles are heterogeneous over the longitudinal extent of the needle, which leads to non-homogeneous wear of these needles. Reducing the length of the needles makes it possible to reduce the undesirable effects of this wear. [0019] According to one embodiment, the transmission system comprises synchronization elements so that the bearing of the first pad is synchronous with the bearing of the second pad.
[0020] Lorsque la première transmission est actionnée, seul le patin en contact avec la piste et le chemin de roulement associé sous la contrainte des efforts repris va se déplacer, ceci en fonction du couple de frottement appliqué sur cette liaison. L'autre patin qui est libre peut alors bouger librement ou rester immobile. Si la première transmission est actionnée dans le sens opposé, le patin libre devient le patin plaqué par les efforts. S'il n'est pas positionné correctement, il ne disposera pas de la course nécessaire pour effectuer le mouvement complet et viendra en butée. Les corps roulants se mettront à glisser sur leur chemin, provoquant une forte usure et un endommagement prématuré. Les éléments de synchronisation visent à réduire voire annuler ce risque et garantir le bon positionnement du patin libre par rapport au patin plaqué par les efforts. When the first transmission is actuated, only the pad in contact with the track and the associated raceway under the stress of the forces taken up will move, this depending on the friction torque applied to this connection. The other free skate can then move freely or remain stationary. If the first transmission is actuated in the opposite direction, the free pad becomes the pad clamped by the forces. If it is not positioned correctly, it will not have the necessary travel to perform the complete movement and will come to a stop. The rolling bodies will begin to slip in their path, causing heavy wear and premature damage. The synchronization elements are intended to reduce or even eliminate this risk and to guarantee the correct positioning of the free shoe relative to the shoe applied by the forces.
[0021] Suivant un mode de réalisation, les éléments de synchronisation comprennent des éléments de liaison mécaniques tels qu'au moins une tige reliant les deux patins, une imbrication de formes entre les deux patins ou un collage. According to one embodiment, the synchronization elements comprise mechanical connecting elements such as at least one rod connecting the two pads, an interweaving of shapes between the two pads or a bonding.
[0022] Suivant un mode de réalisation, les éléments de synchronisation comprennent des éléments de liaison électromagnétiques. [0022] According to one embodiment, the synchronization elements comprise electromagnetic link elements.
[0023] Suivant un mode de réalisation, la première transmission de type liaison hélicoïdale est formée par un engrènement entre une tige filetée, telle qu'une vis, de l'organe d'entrée et un écrou formé par l'organe intermédiaire, formant ainsi un dispositif vis-écrou, avec ou sans interposition de billes, le dispositif vis-écrou devenant une vis à billes en cas d'interposition de billes. [0024] Suivant un mode de réalisation, la deuxième transmission est formée par une crémaillère de l'organe intermédiaire et d'un pignon de l'organe de sortie engrenant dans la crémaillère. [0023] According to one embodiment, the first transmission of the helical connection type is formed by an engagement between a threaded rod, such as a screw, of the input member and a nut formed by the intermediate member, forming thus a screw-nut device, with or without interposition of balls, the screw-nut device becoming a ball screw in the event of interposition of balls. [0024] According to one embodiment, the second transmission is formed by a rack of the intermediate member and of a pinion of the output member meshing with the rack.
[0025] Suivant un mode de réalisation, l'organe intermédiaire comprend un trou taraudé traversé par l'organe d'entrée. [0025] According to one embodiment, the intermediate member comprises a threaded hole through which the inlet member passes.
[0026] Avantageusement, le système de transmission est configuré de sorte que le premier patin, ou la première piste, et le trou taraudé sont espacés entre eux d'une distance suffisante pour qu'aucun de ces éléments ne soient sécants l'un avec l'autre. Advantageously, the transmission system is configured so that the first pad, or the first track, and the tapped hole are spaced between them by a sufficient distance so that none of these elements are intersecting one with the other.
[0027] Le trou taraudé et le premier patin sont de préférence positionnés dans leurs intégralités respectives de part et d'autre d'un plan parallèle aux deux axes de référence. Le trou taraudé et le deuxième axe de référence sont positionnés de préférence de part et d'autre d'un plan parallèle aux deux axes de référence. Le trou taraudé est ainsi de préférence positionné entre deux plans parallèles à l'axe de référence, le séparant d'une part du ou des patins et d'autre part de la deuxième transmission. The tapped hole and the first pad are preferably positioned in their respective integrals on either side of a plane parallel to the two reference axes. The tapped hole and the second reference axis are preferably positioned on either side of a plane parallel to the two reference axes. The tapped hole is thus preferably positioned between two planes parallel to the reference axis, separating it on the one hand from the pad (s) and on the other hand from the second transmission.
[0028] Dans une autre configuration, la première piste et la deuxième piste sont situées de part et d'autre du trou taraudé pratiqué dans l'organe intermédiaire et situées dans un plan contenant le premier axe de référence, ou proche de celui-ci, et parallèle au deuxième axe de référence. Une telle configuration présente notamment l'avantage de réduire l'épaisseur totale du mécanisme. In another configuration, the first track and the second track are located on either side of the threaded hole made in the intermediate member and located in a plane containing the first reference axis, or close to it , and parallel to the second reference axis. Such a configuration has the particular advantage of reducing the total thickness of the mechanism.
[0029] Suivant un mode de réalisation, l'organe intermédiaire est monobloc, c'est- à-dire formé d'une pièce. Alternativement, il peut être composé de deux pièces ou plus, solidarisées ensemble. According to one embodiment, the intermediate member is in one piece, that is to say formed in one piece. Alternatively, it can be made up of two or more pieces, joined together.
[0030] Suivant un mode de réalisation par exemple, la crémaillère et l'écrou sont formés par au moins deux pièces distinctes de l'organe intermédiaire, fixées l'une par rapport à l'autre. BRÈVE DESCRIPTION DES FIGURES According to one embodiment for example, the rack and the nut are formed by at least two separate parts of the intermediate member, fixed relative to each other. BRIEF DESCRIPTION OF THE FIGURES
[0031] D'autres caractéristiques et avantages de l'invention ressortiront à la lecture de la description qui suit, en référence aux figures annexées, qui illustrent : Other characteristics and advantages of the invention will emerge on reading the following description, with reference to the appended figures, which illustrate:
[Fig. 1] : une vue en perspective d'un système de transmission selon un premier mode de réalisation, illustré sans support de roulement ; [Fig. 1]: a perspective view of a transmission system according to a first embodiment, illustrated without a bearing support;
[Fig. 2] : une vue en perspective d'un système de transmission complet selon ce premier mode de réalisation ; [Fig. 2]: a perspective view of a complete transmission system according to this first embodiment;
[Fig. 3] : une vue des premier et deuxième patins selon ce premier mode de réalisation ; [Fig. 4] : une vue de l'organe intermédiaire et des premières et deuxième pistes selon ce premier mode de réalisation ; [Fig. 3]: a view of the first and second pads according to this first embodiment; [Fig. 4]: a view of the intermediate member and of the first and second tracks according to this first embodiment;
[Fig. 5] : une vue de l'organe intermédiaire et des dents de la deuxième transmission dentée selon ce premier mode de réalisation ; [Fig. 5]: a view of the intermediate member and of the teeth of the second toothed transmission according to this first embodiment;
[Fig. 6] : une vue de face du système de transmission selon ce premier mode de réalisation ; [Fig. 6]: a front view of the transmission system according to this first embodiment;
[Fig. 7] : une vue en coupe A-A de la figure 6 ; [Fig. 7]: a sectional view A-A of FIG. 6;
[Fig. 8] : une vue en coupe B-B de la figure 6 ; [Fig. 8]: a sectional view B-B of FIG. 6;
[Fig. 9] : une vue en perspective d'un système de transmission selon un deuxième mode de réalisation, illustré sans support de roulement ; [Fig. 10] : une vue en perspective d'un système de transmission complet selon ce deuxième mode de réalisation ; [Fig. 9]: a perspective view of a transmission system according to a second embodiment, illustrated without a bearing support; [Fig. 10]: a perspective view of a complete transmission system according to this second embodiment;
[Fig. 11] : une vue des premier et deuxième patins selon ce deuxième mode de réalisation ; [Fig. 11]: a view of the first and second pads according to this second embodiment;
[Fig. 12] : une vue de l'organe intermédiaire et des premières et deuxième pistes selon ce deuxième mode de réalisation ; [Fig. 13] : une vue de l'organe intermédiaire et des dents de la deuxième transmission dentée selon ce deuxième mode de réalisation ; [Fig. 12]: a view of the intermediate member and of the first and second tracks according to this second embodiment; [Fig. 13]: a view of the intermediate member and of the teeth of the second toothed transmission according to this second embodiment;
[Fig. 14] : une vue de face du système de transmission selon ce deuxième mode de réalisation ; [Fig. 15] : une vue en coupe A' -A' de la figure 14 ; [Fig. 14]: a front view of the transmission system according to this second embodiment; [Fig. 15]: a sectional view A '-A' of FIG. 14;
[Fig. 16] : une vue en coupe B'-B' de la figure 14 ; [Fig. 16]: a sectional view B'-B 'of FIG. 14;
[Fig. 17] : une vue en perspective d'un système de transmission selon un troisième mode de réalisation, illustré sans support de roulement ; [Fig. 17]: a perspective view of a transmission system according to a third embodiment, illustrated without a bearing support;
[Fig. 18] : une vue en perspective d'un système de transmission selon ce troisième mode de réalisation sans support de roulement ; [Fig. 18]: a perspective view of a transmission system according to this third embodiment without a bearing support;
[Fig. 19] : une vue de face du système de transmission selon ce troisième mode de réalisation ; [Fig. 19]: a front view of the transmission system according to this third embodiment;
[Fig. 20] : une vue en coupe A”-A” de la figure 19. [Fig. 20]: a sectional view A ”-A” of figure 19.
[0032] Pour plus de clarté, les éléments identiques ou similaires sont repérés par des signes de référence identiques sur l'ensemble des figures. For greater clarity, identical or similar elements are identified by identical reference signs in all of the figures.
DESCRIPTION DÉTAILLÉE D'UN MODE DE RÉALISATION DETAILED DESCRIPTION OF AN EMBODIMENT
[0033] Sur les figures 1 à 8 est illustré un système de transmission de puissance 10 selon un premier mode de réalisation. Figures 1 to 8 is illustrated a power transmission system 10 according to a first embodiment.
[0034] Le système de transmission de puissance 10 de type actionneur permet de transmettre une puissance entre un organe d'entrée 20 mobile en rotation autour d'un premier axe X de référence et un organe de sortie 30 mobile en rotation autour d'un deuxième axe X’ de référence. Les organes d'entrée 20 et de sortie 30 prennent la forme d'arbres d'entrée et de sortie dans les modes illustrés sur les figures. The power transmission system 10 of the actuator type makes it possible to transmit power between an input member 20 movable in rotation about a first reference axis X and an output member 30 movable in rotation about a second reference axis X '. The input 20 and output 30 members take the form of input and output shafts in the modes illustrated in the figures.
[0035] Les premier et deuxième axes X, X’ ne sont pas parallèles, ni sécants. Ils ne sont pas coplanaires. En particulier, les deux arbres d'entrée 20 et de sortie 30 sont orthogonaux. [0036] Le système de transmission 10 comprend un organe intermédiaire 40, située en série sur la chaîne cinématique entre les arbres d'entrée 20 et de sortie 30. L'organe intermédiaire 40 est entraînée en translation suivant le premier axe X par l'arbre d'entrée 20 au moyen d'une première transmission 50 de type vis-écrou, formant globalement une liaison hélicoïdale. L'organe intermédiaire 40 est configurée pour entraîner en rotation l'arbre de sortie 30 au moyen d'une deuxième transmission 60 dentée. The first and second axes X, X 'are not parallel or intersecting. They are not coplanar. In particular, the two input 20 and output 30 shafts are orthogonal. The transmission system 10 comprises an intermediate member 40, located in series on the kinematic chain between the input 20 and output shafts 30. The intermediate member 40 is driven in translation along the first axis X by the input shaft 20 by means of a first screw-nut type transmission 50, generally forming a helical connection. The intermediate member 40 is configured to drive the output shaft 30 in rotation by means of a second toothed transmission 60.
[0037] La première transmission 50 de type vis-écrou ou vis à billes est formée ici par un engrènement entre une tige filetée, telle qu'une vis, de l'arbre d'entrée 20 et d'un écrou formé par l'organe intermédiaire 40. La vis présente un filetage s'étendant hélicoïdalement coaxialement au premier axe de référence X. Le filetage de la vis n'est ici pas illustré pour simplifier la lecture des figures. Ce filetage de la vis tourne dans un trou taraudé 43 formé dans l'organe intermédiaire 40 formant écrou, coaxial par rapport à l'axe de référence X, l'arbre d'entrée 20 muni de la vis traversant le trou taraudé 43. Une telle configuration permet une reprise des efforts en réduisant l'action exercée par l'arbre de sortie 30 sur l'arbre d'entrée 20 via l'organe intermédiaire. The first transmission 50 of the screw-nut or ball screw type is formed here by an engagement between a threaded rod, such as a screw, of the input shaft 20 and of a nut formed by the intermediate member 40. The screw has a thread extending helically coaxially with the first reference axis X. The thread of the screw is not shown here in order to simplify the reading of the figures. This thread of the screw rotates in a threaded hole 43 formed in the intermediate member 40 forming a nut, coaxial with the reference axis X, the input shaft 20 provided with the screw passing through the threaded hole 43. A such a configuration allows the forces to be taken up by reducing the action exerted by the output shaft 30 on the input shaft 20 via the intermediate member.
[0038] Cette liaison vis-écrou 50 permet une transformation du mouvement de rotation d'entrée en translation. This screw-nut connection 50 allows a transformation of the input rotational movement into translation.
[0039] La deuxième transmission 60 illustrées sur ces figures 1 à 8 est en outre formée par une crémaillère 44 solidaire de l'organe intermédiaire 40 et d'un pignon (non illustré] solidaire de l'arbre de sortie 30 engrenant dans la crémaillère 44. Un tel engrenage est particulièrement adapté aux fortes charges. The second transmission 60 illustrated in these Figures 1 to 8 is further formed by a rack 44 integral with the intermediate member 40 and a pinion (not shown) integral with the output shaft 30 meshing with the rack 44. Such a gear is particularly suitable for heavy loads.
[0040] Lorsque l'actionneur est en fonctionnement, la rotation de l'arbre d'entrée 20 autour de son premier axe de référence X entraîne la rotation de la vis dans un sens, dont la denture hélicoïdale engrène avec une denture intérieure du trou taraudé 43 de l'organe intermédiaire 40 entraînant la translation de cet organe intermédiaire 40 le long de cet axe X. Ce mouvement entraîne concomitamment le déplacement des dents de la crémaillère 44, laquelle est solidaire de l'organe intermédiaire 40 déplaçant à son tour le pignon faisant saillie radialement par rapport à l'arbre de sortie 30 dont il est solidaire, le pignon engrenant dans la crémaillère 44. [0041] L'organe intermédiaire 40 est monobloc, de préférence d'un seul tenant. Une telle conception est simplifiée, facile à usiner donc autorisant des côtes fonctionnelles précises, et moins coûteuse. When the actuator is in operation, the rotation of the input shaft 20 around its first reference axis X causes the rotation of the screw in one direction, the helical toothing of which meshes with an internal toothing of the hole thread 43 of the intermediate member 40 causing the translation of this intermediate member 40 along this axis X. This movement simultaneously causes the displacement of the teeth of the rack 44, which is integral with the intermediate member 40 moving in turn the pinion projecting radially with respect to the output shaft 30 of which it is integral, the pinion meshing with the rack 44. The intermediate member 40 is in one piece, preferably in one piece. Such a design is simplified, easy to machine, therefore allowing precise functional dimensions, and less expensive.
[0042] Le système de transmission 10 comprend : un premier patin 71 muni de corps roulants 73 pour rouler sur une première piste 41 de l'organe intermédiaire 40 et configuré pour être disposé entre la première piste 41 de l'organe intermédiaire 40 et un premier chemin de roulement 81 fixe d'une structure fixe 80 ; un deuxième patin 72 muni de corps roulants 73 pour rouler sur une deuxième piste 42 de l'organe intermédiaire 40 et configuré pour être disposé entre la deuxième piste 42 de l'organe intermédiaire 40 et un deuxième chemin de roulement 82 fixe. The transmission system 10 comprises: a first pad 71 provided with rolling bodies 73 for rolling on a first track 41 of the intermediate member 40 and configured to be disposed between the first track 41 of the intermediate member 40 and a first fixed raceway 81 of a fixed structure 80; a second shoe 72 provided with rolling bodies 73 for rolling on a second track 42 of the intermediate member 40 and configured to be disposed between the second track 42 of the intermediate member 40 and a second fixed raceway 82.
[0043] Ces premier et deuxième patins 71, 72 permettent la reprise des efforts engendrés pas la deuxième transmission, 60 ceux-ci étant pressés contre la structure fixe 80 par rapport au système de transmission tel un carter solidaire d'un bâti, ou un rail dédié à la reprise d'efforts. These first and second pads 71, 72 allow the resumption of the forces generated by the second transmission, 60 these being pressed against the fixed structure 80 relative to the transmission system such as a casing integral with a frame, or a rail dedicated to the recovery of forces.
[0044] Les efforts de la deuxième transmission 60 tendent à pousser l'organe intermédiaire 40 radialement par rapport au premier axe X. Les premier et deuxième patins 71, 72 ont vocation à s'opposer à cette force permettant de libérer l'arbre d'entrée 20 de ces contraintes radiales. The efforts of the second transmission 60 tend to push the intermediate member 40 radially relative to the first axis X. The first and second pads 71, 72 are intended to oppose this force to release the shaft d entry 20 of these radial constraints.
[0045] Les premier et deuxième patins 71, 72 sont tous deux formés d'une pluralité de corps roulants 73 maintenus dans une cage 74, les corps roulants 73 se présentant sous la forme d'aiguilles cylindriques. The first and second pads 71, 72 are both formed of a plurality of rolling bodies 73 held in a cage 74, the rolling bodies 73 being in the form of cylindrical needles.
[0046] Les premier et deuxième patins 71, 72 sont distants l'un de l'autre de sorte que les première et deuxième pistes 41, 42 de l'organe intermédiaire 40 sur lesquelles ils roulent respectivement sont distinctes l'une de l'autre. The first and second pads 71, 72 are distant from each other so that the first and second tracks 41, 42 of the intermediate member 40 on which they run respectively are separate from one of the other.
[0047] Afin de coordonner les déplacements des premier et deuxième patins 71, 72, le système de transmission 10 comprend des éléments de synchronisation 75 de sorte que le roulement du premier patin 71 soit synchrone avec le roulement du deuxième patin 72. Dans ce mode de réalisation, les éléments de synchronisation 75 prennent la forme d'éléments de liaison mécaniques reliant les premier et deuxième patins 71, 72 entre eux. Ces éléments mécaniques comprennent ici une pluralité de tiges 751 formant un treillis 752, ce treillis étant solidaire des deux cages 74 des premier et deuxième patins 71, 72, et en particulier formé monobloc et d'un seul tenant avec ces cages 74. Une telle pièce monobloc est relativement résistante et facile à fabriquer tout en permettant d'assujettir les premier et deuxième patins 71, 72 l'un avec l'autre lors de leur déplacement. In order to coordinate the movements of the first and second pads 71, 72, the transmission system 10 comprises synchronization elements 75 so that the bearing of the first pad 71 is synchronous with the bearing of the second pad 72. In this mode embodiment, the synchronization elements 75 take the form of mechanical connecting elements connecting the first and second pads 71, 72 between them. These mechanical elements here comprise a plurality of rods 751 forming a trellis 752, this trellis being integral with the two cages 74 of the first and second pads 71, 72, and in particular formed in one piece and in one piece with these cages 74. one-piece piece is relatively strong and easy to manufacture while allowing the first and second pads 71, 72 to be secured to one another during their movement.
[0048] Les éléments de synchronisation 75 visent à réduire le risque d'usure prématurée et garantir le bon positionnement du patin libre par rapport au patin sous contrainte. The synchronization elements 75 aim to reduce the risk of premature wear and to ensure the correct positioning of the free shoe relative to the shoe under stress.
[0049] Les première et deuxième pistes 41, 42 sont orientées dans une direction opposée à la deuxième transmission 60 de sorte à améliorer la reprise des efforts issus de la deuxième transmission 60 dont la composante principale est orientée globalement dans un plan orthogonal à l'arbre d'entrée d'axe X. The first and second tracks 41, 42 are oriented in a direction opposite to the second transmission 60 so as to improve the absorption of the forces from the second transmission 60, the main component of which is oriented generally in a plane orthogonal to the X axis input shaft.
[0050] L'organe intermédiaire 40 prend la forme d'un parallélépipède présentant sur une face, la ou les pistes de roulement 41, 42 et sur une face opposée, la crémaillère 44. Entre ces deux faces de l'organe intermédiaire, est située le trou taraudé 43 configuré pour accueillir l'arbre d'entrée 20, le trou taraudé 43 axial étant débouchant sur deux autres faces distinctes et opposées deux à deux. On peut tracer un plan Q1 parallèle aux deux axes de référence, d'un côté duquel se trouve le trou taraudé 43, et de l'autre côté se trouvent la ou les pistes de roulement 41, 42 ainsi que les patins 71, 72. On peut également tracer un plan Q2, parallèle aux deux axes de référence X, X’, d'un côté duquel se trouve le trou taraudé 43 et de l'autre côté duquel se trouvent La deuxième transmission 60 , et notamment la crémaillère 44 , le pignon solidaire de l'arbre de sortie 30 et l'axe X’ de l'arbre de sortie. The intermediate member 40 takes the form of a parallelepiped having on one face, the raceway or tracks 41, 42 and on an opposite face, the rack 44. Between these two faces of the intermediate member, is located the threaded hole 43 configured to accommodate the input shaft 20, the axial threaded hole 43 being opening on two other distinct faces and opposite two by two. A plane Q1 can be drawn parallel to the two reference axes, on one side of which is the threaded hole 43, and on the other side are the raceway (s) 41, 42 as well as the pads 71, 72. It is also possible to draw a plane Q2, parallel to the two reference axes X, X ', on one side of which is the tapped hole 43 and on the other side of which are the second transmission 60, and in particular the rack 44, the pinion integral with the output shaft 30 and the axis X 'of the output shaft.
[0051] Chacune des première et deuxième pistes 41, 42 présente une première et une deuxième surface de roulement 41', 42' avec laquelle elle est associée respectivement. Ces surfaces de roulement 41', 42' sur lesquelles roulent les corps roulants 73 sont bordées de façon continue ou discontinue par un ou plusieurs rebords 45 saillant(s) par rapport à ces surfaces de roulement 41', 42' permettant ainsi le bon guidage des patins 71, 72 sur leur course. [0052] Les patins 71, 72 peuvent être guidés par des moyens de guidages qui leurs sont propres, chacun patin étant guidé indépendamment de l'autre ou bien, si les patins sont solidaires l'un de l'autre, ils peuvent être guidés par des moyens de guidages communs, comme c'est le cas pour ce premier mode de réalisation avec les rebords 45. De tels rebords 45 sont également prévus aux extrémités de chacune des première et deuxième pistes 41, 42 pour former des butées en bout de course des patins 71, 72. Ces rebords 45 ont donc une double fonction, d'une part une fonction de guidage des patins 71, 72, en particulier lorsqu'ils sont disposés de part et d'autre latéralement des pistes 41, 42, et d'autre part, une fonction de retenue desdits patins 71, 72, en particulier lorsqu'ils sont situés à chaque extrémité des pistes 41, 42 de sorte à former des butées de fin de course des patins 71, 72, les patins roulants 71, 72 réalisant des allers-retours sur les pistes 41, 42 sur la totalité ou une fraction de leurs longueurs. Each of the first and second tracks 41, 42 has a first and a second running surface 41 ', 42' with which it is associated respectively. These rolling surfaces 41 ', 42' on which the rolling bodies 73 roll are bordered continuously or discontinuously by one or more flanges 45 projecting from these rolling surfaces 41 ', 42' thus allowing good guidance. skates 71, 72 on their course. The pads 71, 72 can be guided by guide means which are specific to them, each pad being guided independently of the other or else, if the pads are integral with one another, they can be guided by common guide means, as is the case for this first embodiment with the flanges 45. Such flanges 45 are also provided at the ends of each of the first and second tracks 41, 42 to form stops at the end of run of the pads 71, 72. These flanges 45 therefore have a dual function, on the one hand a function of guiding the pads 71, 72, in particular when they are arranged on either side of the tracks 41, 42, and on the other hand, a function of retaining said pads 71, 72, in particular when they are located at each end of the tracks 41, 42 so as to form end-of-stroke stops of the pads 71, 72, the roller pads 71, 72 making round trips on tracks 41, 42 on all or one fraction of their lengths.
[0053] Les première et deuxième surfaces de roulement 41', 42' sont coplanaires et situées dans un plan de roulement Pr, le premier axe X de référence et le deuxième axe X' de référence étant chacun parallèle à ce plan de roulement Pr. The first and second rolling surfaces 41 ', 42' are coplanar and located in a running plane Pr, the first reference axis X and the second reference axis X 'each being parallel to this running plane Pr.
[0054] Les première et deuxième surfaces de roulement 41', 42' sont situées de part et d'autre d'un plan de séparation Ps perpendiculaire au plan de roulement Pr et contenant le premier axe X de référence, les première et deuxième surfaces 41', 42' de roulement étant en outre symétrique par rapport à ce plan de séparation Ps. The first and second rolling surfaces 41 ', 42' are located on either side of a separation plane Ps perpendicular to the running plane Pr and containing the first reference axis X, the first and second surfaces 41 ′, 42 ′ of the bearing being furthermore symmetrical with respect to this plane of separation Ps.
[0055] Durant l'utilisation du système de transmission, 10 la première transmission 50 de type vis-écrou ou vis à billes est soumise à un couple de frottement plaquant le premier patin 71 contre la première piste 41 prévue à cet effet, et autorise la reprise des efforts radiaux. Lorsque l'actionnement est inversé, le couple de frottement s'exerce dans un sens de rotation opposé et vient plaquer le deuxième patin 72 contre la deuxième piste 42. During the use of the transmission system, the first transmission 50 of the screw-nut or ball screw type is subjected to a frictional torque pressing the first pad 71 against the first track 41 provided for this purpose, and allows the resumption of radial forces. When the actuation is reversed, the friction torque is exerted in an opposite direction of rotation and presses the second pad 72 against the second track 42.
[0056] Une pluralité de patins 71, 72, assure une meilleure répartition de la reprise des efforts en différentes zones, et permet en outre, en fonction de son agencement, une meilleure reprise des efforts sur le système de transmission 10 dont les mouvements sont alternés. En effet, les pièces sont mobiles dans un sens direct et un sens indirect, inversé par rapport au sens direct, et les différents sens correspondent à des chemins différents pour les efforts. A plurality of pads 71, 72, ensures a better distribution of the absorption of the forces in different zones, and also allows, depending on its arrangement, a better absorption of the forces on the transmission system 10 whose movements are alternate. Indeed, the parts are movable in a direct direction and a indirect direction, reversed compared to the direct direction, and the different directions correspond to different paths for the efforts.
[0057] Le plan de roulement Pr est distant du premier axe X de référence d'une distance d supérieure au rayon r d'un fond de filet des tarauds du trou taraudé 43. Une telle configuration permet d'assoir la stabilité de l'organe intermédiaire 40 par rapport la structure fixe 80 contre laquelle elle est contrainte via les premier et deuxième patins 71, 72. The running plane Pr is distant from the first reference axis X by a distance d greater than the radius r of a thread base of the taps of the tapped hole 43. Such a configuration makes it possible to establish the stability of the intermediate member 40 relative to the fixed structure 80 against which it is constrained via the first and second pads 71, 72.
[0058] Sur les figures 9 à 16 est illustré un système de transmission 10 de puissance selon un deuxième mode de réalisation. [0059] Ce deuxième mode de réalisation diffère essentiellement du premier en ce que les éléments de synchronisation 75 entre les premier et deuxième patins 71, 72 prennent la forme d'éléments de liaison mécaniques reliant les premier et deuxième patins 71, 72 entre eux, ces éléments mécaniques comportant une tige de liaison 753 présentant deux extrémité 753', chacune de ces extrémités 753' étant clipsée à l'une et l'autre de la cage 74 du patin 71, 72 auquel l'extrémité est associée. In Figures 9 to 16 is illustrated a power transmission system 10 according to a second embodiment. This second embodiment differs essentially from the first in that the synchronization elements 75 between the first and second pads 71, 72 take the form of mechanical connecting elements connecting the first and second pads 71, 72 to each other, these mechanical elements comprising a connecting rod 753 having two ends 753 ', each of these ends 753' being clipped to one and the other of the cage 74 of the pad 71, 72 with which the end is associated.
[0060] Par ailleurs, dans ce second mode de réalisation, chaque patin est guidé indépendamment de l'autre par les rebords 45. Moreover, in this second embodiment, each pad is guided independently of the other by the flanges 45.
[0061] Sur les figures 17 à 20 est illustré un système de transmission de puissance selon un troisième mode de réalisation. [0062] Ce troisième mode de réalisation diffère essentiellement du premier en ce que l'organe intermédiaire 40 n'est pas formée monobloc ou d'un seul tenant contrairement aux premier et deuxième modes de réalisation décrits ci-avant, mais elle est formée en deux parties. [0061] In Figures 17 to 20 is illustrated a power transmission system according to a third embodiment. This third embodiment differs essentially from the first in that the intermediate member 40 is not formed in one piece or in one piece unlike the first and second embodiments described above, but it is formed in two parts.
[0063] L'organe intermédiaire 40 comprend : une première partie 40A formant l'écrou et présentant le trou taraudé 43 qui la traverse pour accueillir la vis portée par l'arbre d'entrée 20, de façon similaire aux premier et deuxième modes de réalisation ; et, une deuxième partie 40B formant une partie extérieure de l'organe intermédiaire 40, portant d'un côté la crémaillère 44 et de l'autre côté, les première et deuxième pistes de roulements 41, 42. The intermediate member 40 comprises: a first part 40A forming the nut and having the threaded hole 43 which passes through it to accommodate the screw carried by the input shaft 20, similarly to the first and second modes of production ; and, a second part 40B forming an outer part of the intermediate member 40, carrying on one side the rack 44 and on the other side, the first and second bearing tracks 41, 42.
[0064] La deuxième partie 40B de l'organe intermédiaire 40 comprend un alésage intermédiaire 46 délimitant un espace pour accueillir la première partie 40A intérieure, la forme extérieure de la première partie 40A intérieure étant sensiblement complémentaire de la forme intérieure de l'alésage intermédiaire 46 à l'intérieure duquel vient se loger la première partie 40B. The second part 40B of the intermediate member 40 comprises an intermediate bore 46 delimiting a space to accommodate the first inner part 40A, the outer shape of the first inner part 40A being substantially complementary to the inner shape of the intermediate bore 46 inside which the first part 40B is housed.
[0065] La fixation de la première partie 40A à la deuxième partie 40B est assurée par deux circlips 47 disposés à chaque extrémité de l'alésage intermédiaire 46 pour bloquer en translation les première et deuxième parties 40A, 40B l'une avec l'autre. Le blocage en rotation des première et deuxième parties 40A, 40B est assurée par une clavette 48 configurée pour être interposée entre une rainure de la première partie 40A disposée sur son enveloppe extérieure cylindrique et ouverte radialement vers la deuxième partie 40B et une encoche de la deuxième partie 40B disposée sur le contour de l'alésage 46, ouverte vers l'intérieure de l'alésage intermédiaire 46, en particulier vers la première partie 40A en position assemblée. The fixing of the first part 40A to the second part 40B is provided by two circlips 47 arranged at each end of the intermediate bore 46 to block in translation the first and second parts 40A, 40B with one another . The rotational locking of the first and second parts 40A, 40B is ensured by a key 48 configured to be interposed between a groove of the first part 40A disposed on its cylindrical outer casing and open radially towards the second part 40B and a notch of the second part 40B disposed on the contour of the bore 46, open towards the interior of the intermediate bore 46, in particular towards the first part 40A in the assembled position.
[0066] La liaison en rotation entre les deux parties 40A, 40B est effective lorsque la clavette est en prise à la fois dans la rainure de la première partie 40A et dans l'encoche de la deuxième partie 40B. [0067] Alternativement ou en complément, tout moyen de liaison en translation et/ou en rotation pourra être utilisé pour lier les deux parties 40A, 40B formant ensemble l'organe intermédiaire 40. The rotational connection between the two parts 40A, 40B is effective when the key is engaged both in the groove of the first part 40A and in the notch of the second part 40B. Alternatively or in addition, any translational and / or rotational connection means may be used to connect the two parts 40A, 40B together forming the intermediate member 40.
[0068] L'invention est décrite dans ce qui précède à titre d'exemple. Il est entendu que l'homme du métier est à même de réaliser différentes variantes de réalisation de l'invention sans pour autant sortir du cadre de l'invention. The invention is described in the above by way of example. It is understood that a person skilled in the art is in a position to produce various variant embodiments of the invention without however departing from the scope of the invention.
[0069] Par exemple, le nombre de patins peut varier, le système de transmission pouvant intégrer plus de deux patins. [0070] La première transmission de type liaison hélicoïdale, de type vis-écrou notamment, peut être également un mécanisme de vis à billes, c'est-à-dire un mécanisme comportant des billes positionnées entre le filet de la vis et celui de l'écrou, ainsi qu'un chemin de recirculation de ces billes. [0071] Par ailleurs, il est décrit en référence aux figures des organes d'entrée 20 et de sortie 30 qui prennent la forme d'arbres. Il est bien entendu que les caractéristiques qui ont traits aux arbres d'entrée et de sorties s'appliquent également à tout organe d'entrée et de sortie qui pourrait être employé pour assurer la même fonction. For example, the number of pads can vary, the transmission system being able to integrate more than two pads. The first transmission of the helical link type, of the screw-nut type in particular, can also be a ball screw mechanism, that is to say a mechanism comprising balls positioned between the thread of the screw and that of the nut, as well as a recirculation path for these balls. Furthermore, it is described with reference to the figures of the input 20 and output 30 members which take the form of trees. It is understood that the characteristics which relate to the input and output shafts also apply to any input and output member which could be used to perform the same function.

Claims

REVENDICATIONS
1 . Système de transmission de puissance (10) entre un organe d'entrée (20) mobile en rotation autour d'un premier axe (X) de référence, et un organe de sortie (30) mobile en rotation autour d'un deuxième axe (C') de référence, les premier et deuxième axes (X, X') étant non coplanaires, le système de transmission (10) comprenant un organe intermédiaire (40) entraîné par l'organe d'entrée (20) en translation par rapport à ce dit organe d'entrée (20), selon le premier axe (X) au moyen d'une première transmission (50) de type liaison hélicoïdale, et entraînant en rotation l'organe de sortie (30) au moyen d'une deuxième transmission (60) dentée, le système de transmission (10) étant caractérisé en ce qu'il comprend au moins un premier patin (71) muni de corps roulants (73) pour rouler sur une première piste (41) de l'organe intermédiaire (40) et configuré pour être disposé entre la première piste (41) de l'organe intermédiaire (40) et un premier chemin de roulement (81) fixe de sorte à assurer une reprise d'efforts. 1. Power transmission system (10) between an input member (20) movable in rotation about a first reference axis (X), and an output member (30) movable in rotation about a second axis ( C ') of reference, the first and second axes (X, X') being non-coplanar, the transmission system (10) comprising an intermediate member (40) driven by the input member (20) in translation with respect to to said input member (20), along the first axis (X) by means of a first transmission (50) of the helical link type, and driving the output member (30) in rotation by means of a second toothed transmission (60), the transmission system (10) being characterized in that it comprises at least a first shoe (71) provided with rolling bodies (73) for rolling on a first track (41) of the member intermediate (40) and configured to be disposed between the first track (41) of the intermediate member (40) and a first fixed raceway (81) so as to ensure a resumption of efforts.
2. Système de transmission (10) selon la revendication 1, caractérisé en ce que la première piste (41) est orientée dans une direction opposée à la deuxième transmission (60). 2. A transmission system (10) according to claim 1, characterized in that the first track (41) is oriented in a direction opposite to the second transmission (60).
3. Système de transmission (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la première piste (41) de l'organe intermédiaire (40) est située d'un côté opposé au deuxième axe de référence (C') par rapport à un plan contenant le premier axe (X) de référence et parallèle au deuxième axe de référence (C'). 3. Transmission system (10) according to any one of the preceding claims, characterized in that the first track (41) of the intermediate member (40) is located on a side opposite to the second reference axis (C ' ) with respect to a plane containing the first reference axis (X) and parallel to the second reference axis (C ').
4 Système de transmission (10) selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend un deuxième patin (72) muni de corps roulants (73) pour rouler sur une deuxième piste (42) de l'organe intermédiaire (40) et configuré pour être disposé entre la deuxième piste (42) de l'organe intermédiaire (40) et un deuxième chemin de roulement (82) fixe de sorte à assurer une reprise d'efforts. 4 transmission system (10) according to any one of the preceding claims, characterized in that it comprises a second shoe (72) provided with rolling bodies (73) for rolling on a second track (42) of the intermediate member (40) and configured to be disposed between the second track (42) of the intermediate member (40) and a second fixed raceway (82) so as to ensure a recovery of forces.
5. Système de transmission (10) selon la revendication 4, caractérisé en ce que la première piste (41) présente une première surface de roulement (41') associée, la deuxième piste (42) présente une deuxième surface de roulement (42') associée, les première et deuxième surfaces de roulement (41', 42') étant coplanaires, de préférence coplanaires dans un plan de roulement (Pr) parallèle au premier axe (X) de référence et au deuxième axe (C') de référence. 5. A transmission system (10) according to claim 4, characterized in that the first track (41) has a first running surface (41 ') associated, the second track (42) has an associated second rolling surface (42 '), the first and second rolling surfaces (41', 42 ') being coplanar, preferably coplanar in a rolling plane (Pr) parallel to the first axis (X) of reference and to the second axis (C ') of reference.
6. Système de transmission (10) selon la revendication 5, caractérisé en ce que les première et deuxième surfaces de roulement (41', 42') sont situées de part et d'autre d'un plan de séparation (Ps) perpendiculaire au plan de roulement (Pr) et contenant le premier axe (X) de référence, les première et deuxième surfaces (41', 42') de roulement étant de préférence symétrique par rapport à ce plan de séparation (Ps). 6. Transmission system (10) according to claim 5, characterized in that the first and second rolling surfaces (41 ', 42') are located on either side of a separation plane (Ps) perpendicular to the running plane (Pr) and containing the first reference axis (X), the first and second running surfaces (41 ', 42') preferably being symmetrical with respect to this separation plane (Ps).
7. Système de transmission (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que le patin (71, 72) comporte une pluralité de corps roulants (73) maintenus dans une cage (74). 7. A transmission system (10) according to any one of the preceding claims, characterized in that the shoe (71, 72) comprises a plurality of rolling bodies (73) held in a cage (74).
8. Système de transmission (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que les corps roulants (73) sont des aiguilles cylindriques. 8. Transmission system (10) according to any one of the preceding claims, characterized in that the rolling bodies (73) are cylindrical needles.
9. Système de transmission (10) selon l'une quelconque des revendications précédentes, dépendant au moins de la revendication 4, caractérisé en ce qu'il comprend des éléments de synchronisation (75) de sorte que le roulement du premier patin (71) soit synchrone avec le roulement du deuxième patin (72). 9. A transmission system (10) according to any one of the preceding claims, depending at least on claim 4, characterized in that it comprises synchronization elements (75) so that the bearing of the first pad (71) is synchronous with the bearing of the second pad (72).
10. Système de transmission (10) selon la revendication 9, caractérisé en ce que les éléments de synchronisation (75) comprennent des éléments de liaison mécaniques tels qu'au moins une tige reliant les deux patins (71, 72), une imbrication de formes entre les deux patins (71, 72) ou un collage. 10. A transmission system (10) according to claim 9, characterized in that the synchronization elements (75) comprise mechanical connecting elements such as at least one rod connecting the two pads (71, 72), a nesting of forms between the two pads (71, 72) or a glue.
1 1 . Système de transmission (10) selon la revendication 9, caractérisé en ce que les éléments de synchronisation (75) comprennent des éléments de liaison électromagnétiques. 1 1. Transmission system (10) according to claim 9, characterized in that the synchronization elements (75) comprise electromagnetic link elements.
12. Système de transmission (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la première transmission (50) de type liaison hélicoïdale est formée par un engrènement entre une tige filetée, telle qu'une vis, de l'organe d'entrée (20) et un écrou formé par l'organe intermédiaire (40), avec ou sans interposition de billes. 12. A transmission system (10) according to any one of the preceding claims, characterized in that the first transmission (50) of the helical connection type is formed by an engagement between a threaded rod, such as a screw, of the input member (20) and a nut formed by the intermediate member (40), with or without interposition of balls.
13. Système de transmission (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que la deuxième transmission (60) est formée par une crémaillère (44) de l'organe intermédiaire (40) et d'un pignon de l'organe de sortie (30) engrenant dans la crémaillère (44). 13. A transmission system (10) according to any one of the preceding claims, characterized in that the second transmission (60) is formed by a rack (44) of the intermediate member (40) and a pinion of the 'output member (30) meshing with the rack (44).
14. Système de transmission (10) selon l'une quelconque des revendications précédentes, caractérisé en ce que l'organe intermédiaire (40) est formé d'une pièce. 14. A transmission system (10) according to any one of the preceding claims, characterized in that the intermediate member (40) is formed in one piece.
15. Système de transmission (10) selon les revendications 12 et 13 en combinaison, caractérisé en ce que la crémaillère (44) et l'écrou sont formés par au moins deux pièces distinctes (40A, 40B) de l'organe intermédiaire (40), fixées l'une par rapport à l'autre. 15. Transmission system (10) according to claims 12 and 13 in combination, characterized in that the rack (44) and the nut are formed by at least two separate parts (40A, 40B) of the intermediate member (40 ), fixed in relation to each other.
PCT/EP2020/061425 2019-04-24 2020-04-24 System for power transmission between two shafts separated by an intermediate member WO2020216886A1 (en)

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FR1904312A FR3095485B1 (en) 2019-04-24 2019-04-24 Power transmission system between two shafts separated by an intermediate member
FRFR1904312 2019-04-24

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WO2020216886A1 true WO2020216886A1 (en) 2020-10-29

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2681836A (en) * 1950-03-09 1954-06-22 Jarund Harry Sigurd Valdemar Block bearing
US4175475A (en) 1977-11-30 1979-11-27 General Motors Corporation Worm thread seal for steering gear
EP0450538A2 (en) * 1990-04-02 1991-10-09 Howa Machinery, Ltd. Indexing apparatus
EP2733385A1 (en) * 2011-07-13 2014-05-21 IAI Corporation Actuator
WO2016089857A1 (en) * 2014-12-03 2016-06-09 Ergotron, Inc. Bearing assembly and method
EP3258148A1 (en) * 2016-06-14 2017-12-20 Hamilton Sundstrand Corporation Rotary actuation mechanism

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2681836A (en) * 1950-03-09 1954-06-22 Jarund Harry Sigurd Valdemar Block bearing
US4175475A (en) 1977-11-30 1979-11-27 General Motors Corporation Worm thread seal for steering gear
EP0450538A2 (en) * 1990-04-02 1991-10-09 Howa Machinery, Ltd. Indexing apparatus
EP2733385A1 (en) * 2011-07-13 2014-05-21 IAI Corporation Actuator
WO2016089857A1 (en) * 2014-12-03 2016-06-09 Ergotron, Inc. Bearing assembly and method
EP3258148A1 (en) * 2016-06-14 2017-12-20 Hamilton Sundstrand Corporation Rotary actuation mechanism

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FR3095485B1 (en) 2021-04-16
FR3095485A1 (en) 2020-10-30

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