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
  • 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
  • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
  • F16H25/2247—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with rollers
  • F16H25/2252—Planetary rollers between nut and screw
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T74/00—Machine element or mechanism
  • Y10T74/18—Mechanical movements
  • Y10T74/18568—Reciprocating or oscillating to or from alternating rotary
  • Y10T74/18576—Reciprocating or oscillating to or from alternating rotary including screw and nut
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T74/00—Machine element or mechanism
  • Y10T74/19—Gearing
  • Y10T74/19642—Directly cooperating gears
  • Y10T74/19688—Bevel
  • Y10T74/19693—Motor vehicle drive

Definitions

• the present invention relates to an improvement to the actuator devices that are generally known today: rotolinear actuators with satellite rollers.
• actuator devices consist of a male part and a female part, which parts are coaxial and threaded with, in between, satellite rollers, also threaded, which are joined by rings to form a kind of barrel.
• the barrel is integral with the male piece in that it only rotates around the male piece without axial displacement; the thread of this male piece and the thread of the rollers are reversed, with the same pitch.
• the female part is then in the form of a sleeve internally threaded with a different pitch from that of the male part.
• the cylinder is secured to the female part which is in the form of a socket acting as a nut; the barrel is then associated with this sleeve-nut.
• the threads of the rollers have a pitch identical, but reversed, to that of the sleeve-nut and the male part, in this case, comprises a thread whose length is adapted to the stroke of the actuator with a step different from that of the socket-nut.
• the combination of the movements of the male and female parts and the rollers generates a constant differential pitch between the two parts and a displacement of one relative to the other, each turn.
• the service life of these actuators depends on several factors such as the materials used, the lubricants, but it also depends on the length of the active nets of the satellite rollers, said rollers, in particular, constituting wearing parts.
• actuators are subject to constraints of weight, bulk and also to constraints related to maintenance. These actuators must be able to operate for thousands of hours without maintenance, with total reliability. These constraints imply the adoption of simple and effective technological solutions.
• the satellite rollers are spaced relative to each other, forming a kind of barrel. They can be positioned and guided relative to one another in two ways: either, as described in document JP 2007 177912, by meshing of their synchronization gears on two sets of teeth: an external toothing and an internal toothing, or, as described in documents FR 2 837 550 and FR 2 093 070, by means of spacer rings with a single meshing, and it is this assembly consisting of rollers and rings which forms a kind of barrel.
• rollers described in JP2007177912 do not need spacer rings and they do not include arrangements that may constitute trunnions.
• the rollers have a large size because of the length of the side gears which each slide longitudinally on their inner meshing ring and wedging.
• rollers as described in the two documents FR 2 837 550 and 2 093 070 cited above, are shaped with journals which cooperate with orifices acting as bearings, which orifices are arranged in these spacing rings.
• the rollers comprise a central part which is threaded and, on each side, between this central part and said journals, they comprise the synchronization gears which make it possible to wedge each roll with respect to the workpiece. which they are associated: either the male part or the female part, as the case may be.
• FR 2 837 550 cited above, are of cylindrical shape, threaded over the entire length of their periphery and the pinions are cut directly into the thickness of the thread, at both ends, between the threaded central portion and the trunnions.
• the present invention proposes a new roller arrangement which makes it possible to improve singularly this type of actuator device in several planes.
• the invention allows to benefit from a significant increase in the effective length and effective threading of the central portion of these rolls, of the order of 20%.
• the spacers that serve to position and guide the rollers are self-centered, that is to say that they do not require additional means to immobilize them, as it is the case for the devices described in the documents FR 2 837 550 and 2 093 070 cited above, for example.
• the actuator device comprises satellite rollers which are positioned and guided by spacer rings and the assembly consisting of these rollers and of these rings forms a cylinder which is interposed between two parts which are also threaded: a male part and a female part, which rollers comprise, on the one hand, timing gears which are arranged at their ends and, on the other hand, on the length of their threaded portion which is situated between said gears, at least one annular groove acting as a journal, each pin cooperating with an open notch bearing arranged on said spacer ring of said rollers.
• the rollers comprise two grooves, each groove being arranged between an end pinion and the central threaded portion, each of said grooves acting as a pin to cooperate with the corresponding spacer ring.
• each roller spacer ring comprises bearings in the form of radial notches and, as the case may be, these cavities are open towards the inside, that is to say towards the male part, or outward, that is to say towards the female part; they are open towards the inside when the rollers are associated with the female part and they are open towards the outside when the rollers are associated with the male part.
• the diameter of the trunnions is of the order of half the diameter of the rollers and the length of these trunnions is of the same order as their diameter.
• the invention also relates to the satellite rollers as such that is to say rollers which have pinions arranged at the ends and, between these pinions and the threaded central part, grooves which act as trunnions for cooperating with bearings arranged on the spacer rings, which bearings for positioning and guiding said rollers of the actuator device.
• FIG. 1 shows a partial and schematic, a half-sectional view of the part an actuator showing a roller according to the invention in the case of the cylinder associated with the female part, that is to say the nut-sleeve;
• FIG. 2 is a sectional view along 2-2 of Figure 1 showing the spacer ring of the rollers, with its slots open inwardly, that is to say on the thread of the male part;
• FIG. 3 is a sectional view along 3-3 of Figure 4 showing the spacer ring of the rollers, with its notches open outwardly, that is to say open on the thread of the female part ;
• FIG. 4 is a half-sectional view also showing a roller for an actuator in which the cylinder and the rollers are associated with the male part.
• Figure 1 shows a portion of the male part 1 and a female part 2 in the form of a socket which serves Nut with a roller between the two 3.
• the two parts 1 and 2 are concentric and the roller 3 is in the form of a cylinder whose axis is parallel and offset with respect to the axis XX ' said parts 1 and 2.
• the roller 3 is monoblock and it comprises:
• a cylindrical central portion 4 which is threaded and which cooperates with the threads of the male part 1 and the female part 2, - a pinion 5 located at each end, which pinions 5 meshing each with a toothing arranged in the edges of the female part 2 and they each also comprise, in addition, a thread which cooperates with that of the male part 1, the same thread as that of said central portion 4,
• the spacing rings 7 are rings that can be described as inner rings 7i because they are associated with the female part 2, located inside this female part 2.
• Figure 2 shows the male parts 1 and female 2 which are coaxial and, in between, a spacer ring 7i which allows to position and wedge the different rollers 3 relative to each other.
• the ring 7i has notches 8 which act as bearings to accommodate the rollers 3 and in particular their journal 6. These notches 8, labeled 8i, are radial and are open towards the center of the actuator, that is to say towards the male part 1 which is presented as a simple threaded rod.
• rollers 3 are held in position in the notches 8i of the rings 7i by the male part 1 when the latter is in place, which implies, for their implementation in said rings 7i, the use of a suitable tool, not shown, which holds them provisionally in all or part of said notches 8i.
• the diameter of the journals 6 is, for example, of the order of half the diameter of the roll 3 and the length of these journals 3 is of the same order as their diameter, for example.
• the length of the pinions 5 is of the same order as that of the pins 3.
• Figures 3 and 4 correspond to a mounting of the rollers 3 which is reversed with respect to that of Figures 1 and 2.
• the rollers 3 are associated with the male part 1 and they cooperate with the female part 2 which is in the form of a sheath; this sheath is threaded internally over a length which corresponds to the stroke of the actuator.
• rollers 3 are identical to those described above in connection with Figures 1 and 2, but they are kept spaced by means of rings 7 which are different from the rings 7i.
• the rings 7, shown in FIGS. 3 and 4 rotate on the male part 1 and the notches 8 which accommodate the journals 6 of the rollers 3 are open towards the outside, that is to say toward the female part 2.
• the rings 7i and 7e are autocentered between each pinion 5 and the central portion 4 of these rollers 3, so that these rings 7i and 7e are trapped in said rollers. 3.
• the rings 7i are closed on the internal face of the female part 2 while the rings 7e are closed on the male part 1.
• FIGS. 1 and 2 show the presence of grooves 9i on the female part 2 at the periphery of each ring 7i; these grooves correspond to clearance zones for machining the internal teeth of said female part 2, which teeth meshing with the synchronization gears 5 of the rollers 3.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Transmission Devices (AREA)
• Rolls And Other Rotary Bodies (AREA)
• Gear Transmission (AREA)

Applications Claiming Priority (2)

Publications (1)

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• 2009
  • 2009-02-09 FR FR0950795A patent/FR2942016B1/fr not_active Expired - Fee Related
• 2010
  • 2010-02-05 WO PCT/FR2010/050190 patent/WO2010089515A1/fr active Application Filing
  • 2010-02-05 US US13/146,822 patent/US8312784B2/en not_active Expired - Fee Related
  • 2010-02-05 EP EP10708290A patent/EP2394074A1/de not_active Withdrawn

Non-Patent Citations (1)

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