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
  • 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
  • F16H19/06—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 flexible members, e.g. an endless flexible member
  • F16H19/0622—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 flexible members, e.g. an endless flexible member for converting reciprocating movement into oscillating movement and vice versa, the reciprocating movement is perpendicular to the axis of oscillation
• • 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
  • 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
• • 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
  • F16H2025/2062—Arrangements for driving the actuator
  • F16H2025/2075—Coaxial drive motors

Definitions

• the invention relates to a cable jack comprising a screw/nut assembly whose nut is movable in translation and connected using cables to an element to be moved.
• Cable jacks comprising a motorized screw extending along a longitudinal axis and which is mounted on a chassis.
• a nut cooperates with the screw and is associated with anti-rotation means so that relative rotation of the screw and the nut causes a linear movement of the nut.
• a first cable whose ends are connected to the nut forms a first loop between a first pulley and a second pulley of a first pair of pulleys.
• a second cable whose ends are connected to the nut makes a second loop between a third pulley and a fourth pulley of a second pair of pulleys.
• the first and third pulleys are generally integral in rotation with the same shaft and connected to an output of the actuator.
• a cylinder which, although having a total length close to the maximum stroke of the nut, has a significant footprint in width (considered in a direction parallel to the axes of rotation of the pairs of pulleys) and in height (considered in a direction parallel to the axes of rotation of the pairs of pulleys) and in height (considered in a direction orthogonal to the axes of rotation of the pulleys and to the longitudinal axis).
• the minimum width of such a cable jack corresponds to that of the nut and the two pulleys, when its minimum height corresponds to half the height of the nut to which is added the height of the pulleys.
• cable jacks comprising a motorized nut mounted on a frame and which cooperates with a screw extending along a longitudinal axis.
• the screw has anti-rotation means so that rotation of the nut causes linear movement of the screw.
• a first cable the ends of which are connected to the ends of the screw, forms a loop between a first pulley and a second pulley of a first pair of pulleys.
• the first pulley and the second pulley are included in a plane normal to the axis of rotation of the pulleys and which includes the longitudinal axis.
• the pulleys are positioned relative to the longitudinal axis so that it is tangent to the pulleys.
• This type of cable jack has a reduced width compared to the type of jack previously described but has a total length substantially equal to twice the maximum stroke of the jack to which is added approximately the length of the screw .
• the minimum height of the cylinder is also approximately equal to half the height of the nut to which is added the height of the pulleys.
• the object of the invention is to improve the compactness of a cable jack.
• an actuator comprising a chassis, a screw/nut assembly comprising a nut cooperating with a screw extending along a longitudinal axis, a motor arranged to rotate the screw and cause a linear movement of the nut .
• the actuator also comprises a single pair of transmissions comprising a first transmission and a second transmission mounted to rotate on the chassis, the first transmission being connected to an output of the actuator.
• a first member for transmitting a tensile force is coupled to the nut by its first end and its second end and cooperates with the first return and the second return.
• the first member for transmitting a tensile force is a cable or a toothed belt.
• the compactness of the actuator is improved when the anti-rotation device comprises a carriage connected on the one hand to the nut and on the other hand to the first member for transmitting a traction force. It is possible to further improve the compactness of the actuator when the anti-rotation device comprises a mechanism for guiding a translation in a direction parallel to the longitudinal axis of the carriage relative to the chassis.
• the guide mechanism is a prismatic linear guide mechanism and/or comprises two translation guide points.
• the carriage is connected to the nut by a first pair of cables comprising a second cable and a third cable extending on either side of the screw as well as by a second pair of cables comprising a fourth cable and a fifth cable extending on either side of the screw.
• the operation of the actuator is further improved when the second cable and the third cable are coupled to the nut by a first intermediate support connected to the nut by a seventh cable and an eighth cable and/or the fourth cable and the fifth cable are coupled to the nut by a second intermediate support connected to the nut by a ninth cable and a tenth cable.
• this design allows tolerances in positioning and parallelism of the guide and the screw as well as parasitic kinematic oscillations of the nut relative to the screw which is particularly favorable to the reduction and regularity of friction.
• the actuator comprises a device for tensioning the second and/or third cable.
• these cables are very short, they can be chosen for their resistance and not for their stiffness, which can help to reduce the diameter of the nut.
• Figure 1 is a schematic representation in plan and front view of an actuator according to a first embodiment of the invention
• Figure 2 is a schematic representation in plan and top view of the actuator of Figure 1;
• Figure 3 is a schematic representation in plan and front view of an actuator according to a second embodiment of the invention.
• Figure 4 is a schematic representation in plan and top view of the actuator of Figure 3;
• Figure 5 is a schematic representation in plan and front view of an actuator according to a third embodiment of the invention.
• Figure 6 is a schematic representation in plan and side view of the actuator of Figure 5.
• the carriage 41 comprises a base 42 which extends substantially parallel to the longitudinal axis Ox and at the ends of which a first arm 43 and a second arm 44 project.
• the carriage 41 is connected to the nut 4 by a first pair of cables 60 comprising a second cable 61 and a third cable 62 extending on either side of the screw 2 as well as by a second pair of cables 70 comprising a fourth cable 71 and a fifth cable 72 s extending on either side of the screw 2.
• the first pair of cables 60 and the second pair of cables 70 extend in a direction substantially parallel to the longitudinal axis and the first pair of cables 60 and the second pair of cables are located on either side of a first plane PI passing through the nut 4 and which is normal to the screw 2.
• a third end 61.1 of cable 61 and a fourth end 62.1 of cable 62 are crimped on arm 43.
• a fifth end 71.1 of cable 71 and a sixth end 72.1 of cable 72 are crimped on arm 44.
• the second cable 61, the third cable 62, the fourth cable 71 and the fifth cable 72 are crimped at their other ends to the ring 5.
• the first cable 6 has its first end 6.1 which is crimped on the arm 43 and extends parallel to the longitudinal axis Ox up to the first pulley 10 to engage in the first groove 10.1 and make a half-turn of winding on the first pulley 10.
• the first cable 6 extends at the outlet of the first pulley 10 parallel to the longitudinal axis Ox to engage in the second groove 11.1 of the second pulley 11 and make a half winding turn.
• the first cable 6 then extends to the ring 5 on which the second end 6.2 of the first cable 6 is crimped.
• the cable 6 is preferably connected by crimping to the pulley 10 or also to the pulley 11.
• the first pulley 10 is integral in rotation with a finger 80 which constitutes the output of the actuator 1.
• the finger 80 corresponds, here, to a phalanx of a mechanized hand not shown.
• a seventh end 61.2 of the second cable 61 and an eighth end 62.2 of the third cable 62 are coupled to the nut 4 by a first intermediate support 90 connected to the nut 4 by a seventh cable 91 and an eighth cable 92.
• the first intermediate support 90 is here in the form of a ring and comprises a first drilling 90.1 in which the seventh end 61.2 of the cable 61 is crimped.
• the first intermediate support 90 also comprises a second bore 90.2 diametrically opposite the first bore 90.1 and into which the eighth end 62.2 of the cable 62 is crimped.
• the first intermediate support 90 also comprises a third bore 90.3 in which a ninth end 91.1 of the seventh cable 91 is crimped and a sixth bore 90.4 in which the tenth end 92.1 of the cable 92 is crimped.
• the eleventh end 91.2 of the cable 91 is crimped in a seventh hole 5.1 of the ring 5 and the twelfth end 92.2 of the cable 92 is crimped in an eighth hole 5.2 of the ring 5.
• the thirteenth end 71.2 of the fourth cable 71 and the fourteenth end 72.2 of the fifth cable 72 are coupled to the nut 4 by a second intermediate support 95 connected to the nut 4 by a ninth cable 96 and a tenth cable 97.
• the second intermediate support 95 is here, in the form of a ring and includes a seventh hole 95.1 in which the thirteenth end is crimped
• the second intermediate support 95 also comprises an eighth bore 95.2 diametrically opposite the seventh bore 95.1 and in which the fourteenth end 72.2 of the cable 72 is crimped.
• the second intermediate support 95 also includes a ninth drilling
• the seventeenth end 96.2 of the cable 96 is crimped into the seventh hole 5.1 and the eighteenth end 97.2 of the tenth cable 97 is crimped into the eighth hole 5.2.
• the third end 61.1 of the cable 61 is, here, not crimped on the arm 43 but is secured to a threaded end which passes through a ninth bore 43.1 of the arm 43.
• a knurled nut is engaged on the threaded end piece and has one of its faces which rests on the arm 43. Action on the nut makes it possible to put the cables 61, 62, 71, ni, 91, 92, 96 and 97 in tension.
• connection of the ends 6.1 and 6.2 of the first cable 6 to the carriage 41 are located above a second plane P2 orthogonal to the first plane PI and which comprises the Longitudinal axis Ox.
• This configuration makes it possible to further reduce the size of the actuator 1 without generating parasitic forces on the screw 2 / nut 4 assembly.
• the cables 6, 61, 62, 71, 72, 91, 92, 96 and 97 are advantageously preloaded.
• the invention also applies to other types of screws such as for example a screw with simple threads, or with rollers;
• the first cable is coupled to the nut by a crimp made in a ring secured to the nut, the invention also applies to other means of coupling a cable to the nut such as crimping in a hole made in the nut, gluing or welding;
• first pulley and the second pulley are pulleys with cylindrical grooves
• the invention also applies to second and fourth pulleys provided with grooves of different types such as for example helical grooves
• first cable cooperates with the two pulleys
• the invention also applies to a first cable which comprises a first strand connecting the nut (via the frame) and the first pulley, then a second strand distinct from the first which has one of its ends connected by crimping to the first pulley and the other of its ends connected by crimping to the second pulley.
• first cable may include a third strand, one end of which is crimped onto the second pulley and the other end of which is connected to the nut (via the frame). The set of distinct strands forming a first cable which cooperates with the first and second pulley to achieve transmission between two points of connection to the nut;
• the anti-rotation device comprises cables connecting the nut to a linearly guided carriage
• the invention also applies to other types of anti-rotation such as for example one or more rollers secured to the nut and engaged in one or more grooves or a connecting shaft of the nut with a linear guide
• the actuator comprises a guide mechanism with two guide points in translation
• the invention also applies to a guide mechanism comprising a different number of guide points such as for example a single point guidance or more than two;
• the guide mechanism is a prismatic linear guide
• the invention also applies to other types of translation guidance such as for example one or more sliding pivots;
• linear guide comprises two pads cooperating with a rail
• the invention also applies to other types of linear guides, such as for example a prismatic linear guide using one or more pads with ball recirculation or a linear guide comprising a ball recirculation bush mounted on a splined shaft;
• the invention also applies to other modes of cooperation of the first cable with the pulleys such as for example a connection by friction for example to the using one or more dead turns of the cable around a pulley;
• the output of the actuator is a finger integral in rotation with the first pulley
• the invention also applies to other types of output of the actuator such as for example an output integral with the first cable and which translates to obtain a linear actuator;
• the third end of the second cable comprises a threaded end cooperating with a knurled nut
• the invention also applies to other types of device for tensioning the second and/or third cable such as for example a fir tooth type ratchet assembly or an eccentric roller;
• the actuator comprises a cable connected to the nut and cooperating with smooth pulleys
• the invention also applies to other types of members for transmitting a traction force such as for example a chain, a toothed belt or not, a ribbon, a hybrid member comprising connecting rods connected by cable;
• the invention also applies to other types of steering gears adapted to other types of control members.
• transmission of a force such as sprockets for chains, toothed or non-toothed wheels for toothed belts, guide rollers for straps or ribbons.

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

Applications Claiming Priority (2)

Publications (1)

Family

ID=82942386

Family Applications (1)

Country Status (7)

Families Citing this family (2)

Family Cites Families (7)

• 2022
  • 2022-06-23 FR FR2206265A patent/FR3137146B1/fr active Active
• 2023
  • 2023-06-08 US US18/873,377 patent/US12584543B2/en active Active
  • 2023-06-08 EP EP23736421.1A patent/EP4544205A1/de active Pending
  • 2023-06-08 WO PCT/FR2023/050821 patent/WO2023247850A1/fr not_active Ceased
  • 2023-06-08 CN CN202380047099.8A patent/CN119404027A/zh active Pending
  • 2023-06-08 KR KR1020247041322A patent/KR20250022691A/ko active Pending
  • 2023-06-08 JP JP2024573164A patent/JP2025520369A/ja active Pending

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