WO2022207663A1 - Simplified gearshift device and associated mobility vehicle - Google Patents

Simplified gearshift device and associated mobility vehicle Download PDF

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Publication number
WO2022207663A1
WO2022207663A1 PCT/EP2022/058320 EP2022058320W WO2022207663A1 WO 2022207663 A1 WO2022207663 A1 WO 2022207663A1 EP 2022058320 W EP2022058320 W EP 2022058320W WO 2022207663 A1 WO2022207663 A1 WO 2022207663A1
Authority
WO
WIPO (PCT)
Prior art keywords
retaining ring
selection shaft
shaft
gearshift
pawl
Prior art date
Application number
PCT/EP2022/058320
Other languages
French (fr)
Inventor
Jerome Boulet
Original Assignee
Valeo Embrayages
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 Valeo Embrayages filed Critical Valeo Embrayages
Publication of WO2022207663A1 publication Critical patent/WO2022207663A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M6/00—Rider propulsion of wheeled vehicles with additional source of power, e.g. combustion engine or electric motor
    • B62M6/40—Rider propelled cycles with auxiliary electric motor
    • B62M6/55—Rider propelled cycles with auxiliary electric motor power-driven at crank shafts parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
    • B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
    • B62M11/06—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with spur gear wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M25/00—Actuators for gearing speed-change mechanisms specially adapted for cycles
    • B62M25/08—Actuators for gearing speed-change mechanisms specially adapted for cycles with electrical or fluid transmitting systems
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D11/00—Clutches in which the members have interengaging parts
    • F16D11/08—Clutches in which the members have interengaging parts actuated by moving a non-rotating part axially
    • F16D11/12—Clutches in which the members have interengaging parts actuated by moving a non-rotating part axially with clutching members movable otherwise than only axially
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
    • F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
    • 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
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
    • F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
    • F16H3/083—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts with radially acting and axially controlled clutching members, e.g. sliding keys
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/304—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
    • F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
    • F16D2023/123—Clutch actuation by cams, ramps or ball-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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H63/304—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force
    • F16H2063/3063—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force using screw devices
    • 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
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/30—Constructional features of the final output mechanisms
    • F16H2063/3093—Final output elements, i.e. the final elements to establish gear ratio, e.g. dog clutches or other means establishing coupling to shaft
    • F16H2063/3096—Sliding keys as final output elements; Details thereof
    • 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
    • F16H2200/00—Transmissions for multiple ratios
    • F16H2200/003—Transmissions for multiple ratios characterised by the number of forward speeds
    • F16H2200/0052—Transmissions for multiple ratios characterised by the number of forward speeds the gear ratios comprising six forward speeds
    • 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
    • F16H3/00—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion
    • F16H3/02—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion
    • F16H3/08—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts
    • F16H3/087—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears
    • F16H3/089—Toothed gearings for conveying rotary motion with variable gear ratio or for reversing rotary motion without gears having orbital motion exclusively or essentially with continuously meshing gears, that can be disengaged from their shafts characterised by the disposition of the gears all of the meshing gears being supported by a pair of parallel shafts, one being the input shaft and the other the output shaft, there being no countershaft involved

Definitions

  • the present invention relates to the field of gear change devices, and more particularly a gear change device for a mobility device using at least one electric propulsion, and for example an electrically assisted bicycle.
  • a driving force is transmitted to the wheels via a crank system rotating around a crank axle which drives the rear wheel generally by a chain.
  • gearboxes for mobility devices are already known in the prior art.
  • patent FR2913661 discloses a gear-changing device for bicycles comprising a gear-driven gearbox and a sliding shuttle for selecting the gear ratio. speed.
  • the shuttle acts on a ratchet system which in turn acts on the input pinions to engage the chosen speed.
  • the disadvantage of the system described in this patent stems from the fact that it comprises many parts, which complicates its manufacture, its assembly and makes it more expensive.
  • the present invention proposes a gearshift device for a mobility device comprising: a selection shaft in which a shuttle and an endless screw are arranged, at least two input pinions arranged to rotate freely around the selection shaft, at least two output pinions integral in rotation with a hollow shaft, a gear change actuator arranged to move the shuttle along the endless screw between at least two positions, and engage a selected gear, at least two pawls arranged at the selection shaft, each pawl being associated with a lifting device making it possible to lift the pawl via the shuttle, and to engage the select ratio via the input and output pinions, the device also comprising an elastic retaining ring, to hold the set of pawls in place inside the selection tree.
  • the retaining ring forms a cylinder pressed inside the selection shaft, against the internal surface of the selection shaft.
  • the retaining ring comprises at least two tabs formed from the ring.
  • tabs are formed by cutting, stamping or bending the retaining ring.
  • each tongue is arranged under a pawl at the level of a part of the pawl inserted into a housing formed in the selection shaft.
  • the retaining ring comprises openings which cooperate with balls placed under the pawls.
  • the retaining ring comprises at least one series of seven tongues arranged one after the other along the longitudinal axis X2 of the selection shaft and at least one series of seven openings arranged one after the other along the longitudinal axis X2 of the selection shaft, under each ball.
  • the series of tabs and openings are interposed in the radial direction of the retaining ring.
  • the invention also relates to a mobility device, in particular an electrically assisted mobility device, comprising a gearshift device according to the invention.
  • the machine is an electrically assisted bicycle.
  • FIG. 3b] illustrates a cross-sectional view of the transmission assembly
  • [Fig.4] is a cross-sectional view of a gearshift device according to the invention
  • [Fig. 5] is an elevational view of the retaining ring according to the invention
  • [Fig. 6] is a sectional view of part of the gearshift device with the retaining ring according to the invention
  • the [Fig. 7] is a view of the inside of the casing incorporating part of the transmission assembly according to the invention.
  • the [Fig. 1] illustrates a mobility device 1 according to one of the aspects of the invention.
  • the machine 1 is id an electrically assisted bicycle comprising an electric motor 2.
  • the electric motor 2 is arranged to ensure part of the propulsion of the machine.
  • the bicycle has at least two wheels 3, 3 'to which a driving force is supplied, via two pedals or equivalent rotating around a crank axle of axis Xp which drives the rear wheel for example by a chain, or any other means of transmission when in use.
  • the machine 1 also comprises a control unit 4 as well as several sensors 5, 5', 5'', located for example at the level of the pedal assembly, on the frame of the bicycle or at the level of a wheel 3, 3'.
  • the machine 1 represented here also comprises an energy storage device in the form of a battery 6, a lighting system 7, a crankset 8 of axis Xp, a location and/or navigation system 90 as well as a man-machine interface system 91 comprising in particular a touch screen capable of displaying information for and/or taking into account the requests of said user.
  • the man-machine interface system 91 is in particular linked to the location system 90 and serves as a navigation interface.
  • the invention is not limited to a particular man-machine interface system, and may include any system known to those skilled in the art.
  • the wheels 3, 3' are fitted with a braking system 31, comprising in particular disc brakes 32.
  • the machine 1 comprises a transmission assembly 10 illustrated [Fig. 2]
  • the transmission assembly 10 comprises a gear change device 20 according to the invention and the electric motor 2 to provide part of the power for the propulsion of the machine 1.
  • the transmission assembly 10 is at least partly housed in a casing 30 (illustrated [Fig. 7]) here positioned at the level of the pedal 8 whose axis Xp coincides with the output axis X v of the speed change device 20 .
  • the speed change device 20 illustrated [FIG. 3a] and [Fig. 3b] comprises at least 2 reports, and for example 7 reports between a first report said report n°1 and a higher report said report n°7.
  • the speed change device 20 comprises a series of seven output pinions 60 of axis X v, with reference Fi to F 7, integral in rotation of a hollow shaft 80 and a series of seven input pinions 50, with reference Fri to Fr 7 arranged to rotate freely around the shaft of selection40.
  • the selection tree 40 illustrated [FIG. 3a] and [Fig. 4] houses a shuttle 41 surrounding an endless screw 21 of the gearshift device 20.
  • the gearshift device 20 comprises an epicyclic gear train.
  • the machine 1 comprises a gearshift actuator 70 arranged to move the shuttle 41 along the endless screw 21 by a helical kinematic connection, between at least 2 positions and for example between 7 positions from Pi to P7 and engage a selected report.
  • the selection shaft 40 is hollow.
  • the gearshift actuator 70 comprises electrical means for moving the shuttle 41, in the form of a geared motor. This comprises a motor 81 and a reducer 82.
  • the geared motor also comprises a pinion 22 on the axis of the endless screw 21, an intermediate pinion 22' and a pinion 22''' on the axis of the motor 81.
  • the teeth of the pinion 22 , 22', 22'' can be straight as shown or helical in a variant not shown.
  • the rotational guidance of the endless screw 21 is for example ensured by means of bearings at each of its ends.
  • the shuttle 41 is configured to, during its movement, position itself under the pinion of the selected gear, and engage this gear. According to one embodiment of the invention, the shuttle 41 is configured like that described in application FR2975367.
  • the geared motor comprises pinions with parallel axes as illustrated [Fig. 3a] or perpendicular axes.
  • the gear change actuator 70 comprises a bevel, spur or helical gear and/or with one or more stages.
  • the gear change actuator 70 has a belt or a chain or a universal joint or sprockets.
  • the speed change device 20 comprises at the level of the selection shaft 40 at least two pawls 42 and for example for a machine 1 to 7 speeds, comprises seven pawls 42.
  • the gear change device 20 comprises a series of seven pawls arranged one after the other along the longitudinal axis X2 of the selection shaft 40.
  • the gear change device 20 comprises at least one series of at least seven pawls arranged one after the other along the longitudinal axis X2 of the selection shaft 40.
  • the gear change device 20 comprises three series of at least seven pawls arranged one after the other along the longitudinal axis X2 of the selection shaft 40.
  • the series being arranged at 120 degrees from each other around the selection shaft 40.
  • the pawls 42 have a shape configured to cooperate with the Fri input pinions.
  • the pawls 42 are inserted into recesses 420 formed on the selection shaft 40 by one end 422. This end is fully inserted into the housing so as to be pressed against the upper face 423 of the housing 420.
  • Each pawl 42 is associated with a lifting device, and for example a ball 43, visible [Fig.4] and [Fig. 6] arranged in a bore of the selection shaft 40, protruding inside the shaft 40, placed under each pawl 42 so as to be able to lift it via the shuttle 41.
  • the shuttle 41 When the speed is selected, the shuttle 41 is positioned under the input pinion Fn corresponding to the ratio i selected, which is then locked in rotation by one of the pawls 42, and meshes with the corresponding output pinion.
  • a retaining ring 44 illustrated [Fig. 5] and [Fig. 6]
  • the ring is made of elastic material.
  • the ring 44 is made of stamped spring steel.
  • the ring 44 is made of plastic.
  • This retaining ring 44 is arranged inside the selection shaft 40.
  • the ring 44 forms a cylinder pressed inside the selection shaft 40, against the internal surface of the selection shaft 40. The maintenance is thus achieved by the interior of the selection shaft 40.
  • the ring is open in the longitudinal direction.
  • the length of the ring 44 is determined so that the set of pawls 42 is maintained.
  • the retaining ring 44 comprises openings 440 which cooperate with the bi I 43 placed under the pawls.
  • the retaining ring 44 thus makes it possible to maintain or ries bi Islands 43 in place.
  • the retaining ring 44 comprises at least two tabs 441 formed from the ring 44. More specifically, the tabs 441 are formed by cutting, stamping or bending, or any other method making it possible to obtain a tab-shaped, of the retaining ring 44. According to one embodiment, the retaining ring 44 comprises as many Ianguettes441 as pawls42.
  • Each tongue 441 is arranged under a pawl 4 at the level of the part 422 of the pawl 42 inserted into the housing 420 formed in the shaft of selection40.
  • the retaining ring 44 thus makes it possible to maintain the ratchet in the closed position.
  • the retaining ring 44 exerts, through the tongues, on each pawl 42 a pressure, or pressing force, sufficient to press the pawl 42 into the housing 420 while allowing it to be lifted by the shuttle 41
  • the pressing force is defined in such a way as to counter the centrifugal effect on the pawl42.
  • each tab 441 presses on the end 422 of the pawl which is thus pressed against the upper face 423 of the housing 420, the other end 424 of the pawl is also free to be lifted by a pivot effect by the ball 43 .
  • the retaining ring 44 comprises at least a series of seven tabs 441 arranged one after the other along the longitudinal axis X2 of the selection shaft 40, under each pawl 42.
  • the gearshift device 20 comprises three series of at least seven tongues 441 arranged one after the other along the longitudinal axis X2 of the selection shaft 40.
  • the series being arranged at 120 degrees from each other around the selection shaft 40.
  • the retaining ring 44 comprises at least a series of seven openings 440 arranged one after the other along the longitudinal axis X2 of the selection shaft 40, under each ball 43 .
  • the gearshift device 20 comprises three series of at least seven openings 440 arranged one after the other along the longitudinal axis X2 of the selection shaft 40. The series being arranged at 120 degrees from each other around the selection shaft 40.
  • the series of tabs 441 and of opening 440 are inserted in the radial direction of the retaining ring 44.
  • the shuttle 41 makes it possible to select the chosen ratio which will engage a Fri input pinion via a ratchet42.
  • the input pinion Fri then meshes with an output pinion Fi.
  • the worm 21 is driven in rotation by the gear change actuator 70 causing the axial movement of the nut 210 of the screw 21 which drives the shuttle 41 and thus allows the gear change. . Thanks to the pivot connection thus produced, the rotational movement of the endless screw 21 is transformed into a translational movement of the shuttle 41.
  • a stop 211, 211' limits the movement of the shuttle 41 at each end.
  • the movement of the shuttle is controlled by a position sensor.
  • the shuttle 41 is able to assume a so-called neutral position PO for which no gear ratio is engaged.
  • FIG. 7 illustrates in more detail the housing 30 of the mobility device of Figure 1.
  • the box 30 comprises a casing 310 delimiting a first housing 311 arranged to house the gears of the gearshift device 20.
  • the casing 310 also delimits at least two second housings 312, 313, 314, 315, distinct from each other. All of these housings are arranged to respectively house the electric motor 2, the reduction gear 11, the gearshift actuator 70 and the control unit 4 of the mobility device.
  • at least a second housing is sealed, and for example that arranged to contain the control unit 4.
  • the casing 310 housing the gearshift device 20 is closed by two side flanges 317, only one of which is illustrated in FIG. 4.
  • the first housing 311 has two facing openings in the side flanges 317 to accommodate the bottom bracket axle of the mobility device.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)
  • Transmission Devices (AREA)

Abstract

The invention relates to a gearshift device for a mobility vehicle, comprising: - a selection shaft (40) containing a traveller and an endless screw, - at least two input pinions designed to rotate freely about the selection shaft (40), - at least two output pinions made to rotate as one with a hollow shaft, - a gearshift actuator designed to move the traveller along the endless screw between at least two positions and engage a selected ratio, - at least two pawls (42) arranged on the selection shaft (40), each pawl (42) being associated with a lifter device (43) allowing the pawl to be lifted via the traveller and to engage the ratio selected by the input and output pinions, characterized in that it also comprises an elastic retaining ring (44) to hold all of the pawls (42) in place inside the selection shaft (40).

Description

Description Description
Titre de l'invention : Dispositif de changement de vitesse simplifié etengin de mobilité associé. Title of the invention: Simplified gear change device and associated mobility device.
La présente invention concerne le domaine des dispositifs de changement de vitesses, et plus particulièrement un dispositif de changement de vitesse pour un engin de mobilité utilisant au moins une propulsion électrique, et parexemple unvéloà assistance électrique. The present invention relates to the field of gear change devices, and more particularly a gear change device for a mobility device using at least one electric propulsion, and for example an electrically assisted bicycle.
Lors du fonctionnement d'un engin de mobilité, une force motrice est transmise aux roues par l'intermédiaire d'un système de manivelle tournant autour d'un axe de pédalier qui entraîne la roue arrière généralement parune chaîne. During the operation of a mobility device, a driving force is transmitted to the wheels via a crank system rotating around a crank axle which drives the rear wheel generally by a chain.
Il est déjà connu dans l'art antérieur des boites de vitesses pour engin de mobilité Par exemple, le brevet FR2913661 divulgue un dispositif de changement de vitesses pour vélos comportant une boîte de vitesses à engrenages et une navette coulissante pour effectuer la sélection du rapport de vitesse. Gearboxes for mobility devices are already known in the prior art. For example, patent FR2913661 discloses a gear-changing device for bicycles comprising a gear-driven gearbox and a sliding shuttle for selecting the gear ratio. speed.
La navette agit sur un système à cliquets qui vont à leur tour agir sur des pignons d'entrée pour enclencher la vitesse choisie. L'inconvénient du système décrit dans ce brevet provient du fait qu'il comporte de nombreuses pièces, ce qui complexifie sa fabrication, son montage et le rend pluscouteux. The shuttle acts on a ratchet system which in turn acts on the input pinions to engage the chosen speed. The disadvantage of the system described in this patent stems from the fact that it comprises many parts, which complicates its manufacture, its assembly and makes it more expensive.
La présente invention a donc pour objet de pallier un ou plusieurs des inconvénients des dispositifs de l'art antérieur en proposant un dispositif de changement de vitesse simplifié. Pour cela la présente invention propose un dispositif de changement de vitesse pour engin de mobilité comportant : un arbre de sélection dans lequel sontdisposées une navette et une vis sans fin, au moins deux pignons d'entrée agencés pourtourner librementautour de l'arbre de sélection, au moins deux pignonsde sortie solidairesen rotation d'un arbre creux, un actionneurde changement de vitesse agencé pour dé placer la navette le long de la vis sans fin entre au moi ns deux positions, et engager un rapport sélectionné, au moins deux cliquetsdisposésau niveau de l'arbre de sélection, chaque cliquet étant associé à un dispositif de soulèvement permettant de soulever le cliquet via la navette, et à enclencher le rapport sélectionner via les pignons d'entrée et de sortie, le dispositif comportant également une bague de maintien élastique, pour maintenir l'ensemble descliquets, en place à l'intérieurde l'arbre de sélection. Selon un mode de réalisation de l'invention, la bague de maintienforme un cylindre plaqué à l'intérieurde l'arbre de sélection, contre la surface interne de l'arbre de sélection. The object of the present invention is therefore to overcome one or more of the drawbacks of the devices of the prior art by proposing a simplified speed change device. For this, the present invention proposes a gearshift device for a mobility device comprising: a selection shaft in which a shuttle and an endless screw are arranged, at least two input pinions arranged to rotate freely around the selection shaft, at least two output pinions integral in rotation with a hollow shaft, a gear change actuator arranged to move the shuttle along the endless screw between at least two positions, and engage a selected gear, at least two pawls arranged at the selection shaft, each pawl being associated with a lifting device making it possible to lift the pawl via the shuttle, and to engage the select ratio via the input and output pinions, the device also comprising an elastic retaining ring, to hold the set of pawls in place inside the selection tree. According to one embodiment of the invention, the retaining ring forms a cylinder pressed inside the selection shaft, against the internal surface of the selection shaft.
Selon un mode de réalisation de l'invention, la bague de maintien comporte au moinsdeux languettesforméesà partir de la bague. According to one embodiment of the invention, the retaining ring comprises at least two tabs formed from the ring.
Selon un mode de réalisation de l'invention, des languettes sont formées par découpage, emboutissage ou pliage de la bague de maintien. According to one embodiment of the invention, tabs are formed by cutting, stamping or bending the retaining ring.
Selon un mode de réalisation de l'invention, chaque languette estdisposée sous un cliquet au niveau d'une partie du cliquet insérée dans un logementformé dans l'arbre de sélection. Selon un mode de réalisation de l'invention, la bague de maintien comporte des ouvertures qui coopèrent avec des billes placées sous les cliquets. According to one embodiment of the invention, each tongue is arranged under a pawl at the level of a part of the pawl inserted into a housing formed in the selection shaft. According to one embodiment of the invention, the retaining ring comprises openings which cooperate with balls placed under the pawls.
Selon un mode de réalisation de l'invention, la bague de maintien comporte au moins une série de sept languettes disposées les unes à la suite des autres selon l'axe longitudinale X2 de l'arbre de sélection et au moins une série de sept ouvertures disposées les unes à la suite des autres selon l'axe longitudinale X2de l'arbre de sélection, souschaque bille. According to one embodiment of the invention, the retaining ring comprises at least one series of seven tongues arranged one after the other along the longitudinal axis X2 of the selection shaft and at least one series of seven openings arranged one after the other along the longitudinal axis X2 of the selection shaft, under each ball.
Selon un mode de réalisation de l'invention, les séries de languettes et d'ouverture sont intercaléesdans la direction radiale de la bague de maintien. According to one embodiment of the invention, the series of tabs and openings are interposed in the radial direction of the retaining ring.
L'invention concerne également un engin de mobilité, notamment engin de mobilité à assistance électrique, comportant un dispositif de changementde vitesse selon l'invention. Selon un mode de réalisation de l'invention, l'engin est un vélo à assistance électrique D'autres buts, caractéristiques et avantages de l'invention seront mieux compris et apparaîtront plus clairementà la lecture de la description faite, ci-après, en se référantaux figuresannexées, donnéesàtitre d'exemple et dans lesquelles: la [Fig. l] est une vue d'un engin de mobilité selon un des aspects de l'invention, la [Fig. 2] illustre l'ensemble de transmission de l'engin de mobilité de la Figure 1, la [Fig. 3a] illustre une vue en coupe d'une partie de l'ensemble de transmission a) et de l'ensemble de transmission b), la [Fig. 3b] illustre une vue en coupe de l'ensemble de transmission, la [Fig.4] est une vue en coupe d'un dispositif de changementde vitesse selon l'invention, la [Fig. 5] est une vue en élévation de la bague de maintien selon l'invention, la [Fig. 6] est une vue en coupe d'une partie du dispositif de changement de vitesse avec la bague de maintien selon l'invention, la [Fig. 7] est une vue de l'intérieur du boîtier intégrant une partie de l'ensemble de transmission selon l'invention. The invention also relates to a mobility device, in particular an electrically assisted mobility device, comprising a gearshift device according to the invention. According to one embodiment of the invention, the machine is an electrically assisted bicycle. Other aims, characteristics and advantages of the invention will be better understood and will appear more clearly on reading the description given below, in referring to the appended figures, given by way of example and in which: [Fig. 1] is a view of a mobility device according to one of the aspects of the invention, [Fig. 2] illustrates the transmission assembly of the mobility device of Figure 1, [Fig. 3a] illustrates a sectional view of part of the transmission assembly a) and of the transmission assembly b), [Fig. 3b] illustrates a cross-sectional view of the transmission assembly, [Fig.4] is a cross-sectional view of a gearshift device according to the invention, [Fig. 5] is an elevational view of the retaining ring according to the invention, [Fig. 6] is a sectional view of part of the gearshift device with the retaining ring according to the invention, the [Fig. 7] is a view of the inside of the casing incorporating part of the transmission assembly according to the invention.
La [Fig. 1] illustre un engin de mobilité 1 selon un des aspects de l'invention. L'engin 1 est id un vélo à assistance électrique comportant un moteurélectrique 2. Le moteurélectrique 2 est agencé pour assurer une partie de la propulsion de l'engin. The [Fig. 1] illustrates a mobility device 1 according to one of the aspects of the invention. The machine 1 is id an electrically assisted bicycle comprising an electric motor 2. The electric motor 2 is arranged to ensure part of the propulsion of the machine.
Le vélo comporte au moins deux roues 3, 3 'auxquelles est fournie une force motrice, par l'intermédiaire de deux pédales ou équivalent tournant autour d'un axe de pédalier d'axe Xp qui entraîne la roue arrière par exemple parune chaîne, ou tout autre moyen de transmission lors de son utilisation. The bicycle has at least two wheels 3, 3 'to which a driving force is supplied, via two pedals or equivalent rotating around a crank axle of axis Xp which drives the rear wheel for example by a chain, or any other means of transmission when in use.
L'engin 1 comporte également une unité de pilotage 4 ainsi que plusieurs capteurs 5, 5', 5'', situés par exemple au niveau du pédalier, sur le cadre du vélo ou au niveau d'une roue 3, 3'. L'engin 1 ici représenté comporte également un dispositif de stockage d'énergie sous forme d'une batterie 6, un système d'éclairage 7, un pédalier8 d'axe Xp, un système de localisation et/ou navigation 90 ainsi qu'un système interface homme-machine 91 comportant notamment un écran tactile apte à afficher des informations pour et/ou prendre en compte les demandes dudit utilisateur. Le système interface homme-machine 91 est en particulier relié au système de localisation 90 et sert d'interface de navigation. L'invention n'est pas limitée à un système interface homme-machine particulier, et peut comportertout système connu de l'homme du métier. The machine 1 also comprises a control unit 4 as well as several sensors 5, 5', 5'', located for example at the level of the pedal assembly, on the frame of the bicycle or at the level of a wheel 3, 3'. The machine 1 represented here also comprises an energy storage device in the form of a battery 6, a lighting system 7, a crankset 8 of axis Xp, a location and/or navigation system 90 as well as a man-machine interface system 91 comprising in particular a touch screen capable of displaying information for and/or taking into account the requests of said user. The man-machine interface system 91 is in particular linked to the location system 90 and serves as a navigation interface. The invention is not limited to a particular man-machine interface system, and may include any system known to those skilled in the art.
Les roues 3, 3' sont muniesd'un système de freinage 31, comportant notamment des freins à disque 32. The wheels 3, 3' are fitted with a braking system 31, comprising in particular disc brakes 32.
L'engin 1 comporte un ensemble de transmission 10 illustré [Fig. 2] L'ensemble de transmission 10 comporte un dispositif de changement de vitesse 20 selon l'invention et le moteur électrique 2 pour fournir une partie de la puissance pour la propulsion de l'engin 1. Selon un mode de réalisation de l'invention, l'ensemble de transmission 10 est au moins en partie logé dans un boîtier30 (illustré [Fig. 7]) ici positionné au niveau du pédalier8dont l'axe Xp est confondu avec l'axe de sortie Xv du dispositif de changementde vitesse 20. The machine 1 comprises a transmission assembly 10 illustrated [Fig. 2] The transmission assembly 10 comprises a gear change device 20 according to the invention and the electric motor 2 to provide part of the power for the propulsion of the machine 1. According to one embodiment of the invention , the transmission assembly 10 is at least partly housed in a casing 30 (illustrated [Fig. 7]) here positioned at the level of the pedal 8 whose axis Xp coincides with the output axis X v of the speed change device 20 .
Selon un mode de réalisation de l'invention, le dispositif de changementde vitesse 20 illustré [Fig. 3a] et [Fig. 3b] comporte au moins 2 rapports, et par exemple 7 rapports entre un premier rapport dit rapport n°l et un rapport supérieurdit rapport n°7. According to one embodiment of the invention, the speed change device 20 illustrated [FIG. 3a] and [Fig. 3b] comprises at least 2 reports, and for example 7 reports between a first report said report n°1 and a higher report said report n°7.
Selon un mode de réalisation de l'invention, le dispositif de changement de vitesse 20 comporte une série de sept pignons de sortie 60 d'axe Xv, de référence Fi à F 7, solidaires en rotation d'un arbre creux 80 et une série de sept pignons d'entrée 50, de référence Fri à Fr7 agencés pourtourner librementautourde l'arbre de sélection40. According to one embodiment of the invention, the speed change device 20 comprises a series of seven output pinions 60 of axis X v, with reference Fi to F 7, integral in rotation of a hollow shaft 80 and a series of seven input pinions 50, with reference Fri to Fr 7 arranged to rotate freely around the shaft of selection40.
Selon un mode de réalisation de l'invention, l'arbre de sélection 40 illustré [Fig. 3a] et [Fig. 4] loge une navette 41 entourant une vis sans fin 21 du dispositif de changementde vitesse 20. Selon une variante de l'invention, le dispositif de changementde vitesse 20comporte un train épicycloïdal. According to one embodiment of the invention, the selection tree 40 illustrated [FIG. 3a] and [Fig. 4] houses a shuttle 41 surrounding an endless screw 21 of the gearshift device 20. According to a variant of the invention, the gearshift device 20 comprises an epicyclic gear train.
L'engin 1 selon l'invention, comporte un actionneurde changementde vitesse 70 agencé pour déplacer la navette 41 le long de la vis sans fin 21 par une liaison cinématique hélicoïdale, entre au moins 2 positionset par exemple entre 7 positionsde Pi à P7 et engager un rapport sélectionné. The machine 1 according to the invention comprises a gearshift actuator 70 arranged to move the shuttle 41 along the endless screw 21 by a helical kinematic connection, between at least 2 positions and for example between 7 positions from Pi to P7 and engage a selected report.
Selon un mode de réalisation de l'invention, l'arbre de sélection 40 est creux. According to one embodiment of the invention, the selection shaft 40 is hollow.
Selon un mode de réalisation de l'invention, l'actionneurde changementde vitesse 70 comporte des moyens électriques de déplacement de la navette 41, sous forme d'un motoréducteur. Celui-ci comporte un moteur 81 et un réducteur 82. According to one embodiment of the invention, the gearshift actuator 70 comprises electrical means for moving the shuttle 41, in the form of a geared motor. This comprises a motor 81 and a reducer 82.
Selon un mode de réalisation de l'invention, le motoréducteurcomporte également un pignon 22 sur l'axe de la vissans fin 21, un pignon 22' intermédiaire et un pignon 22''' sur l'axe du moteur 81. Les denturesdes pignon 22, 22', 22'' peuvent être droites comme illustré ou hélicoïdalesdans une variante non illustrée. According to one embodiment of the invention, the geared motor also comprises a pinion 22 on the axis of the endless screw 21, an intermediate pinion 22' and a pinion 22''' on the axis of the motor 81. The teeth of the pinion 22 , 22', 22'' can be straight as shown or helical in a variant not shown.
Le guidage en rotation de la vis sans fin 21 est par exemple assuré à l'aide de roulements à chacune de ses extrémités. The rotational guidance of the endless screw 21 is for example ensured by means of bearings at each of its ends.
Selon un mode de réalisation de l'invention, la navette 41 est configurée pour, lors de son déplacement, se positionnersous le pignon du rapport sélectionné, etenclencherce rapport. Selon un mode de réalisation de l'invention, la navette 41 est configurée comme celle décrite dans la demande FR2975367. According to one embodiment of the invention, the shuttle 41 is configured to, during its movement, position itself under the pinion of the selected gear, and engage this gear. According to one embodiment of the invention, the shuttle 41 is configured like that described in application FR2975367.
Selon un mode de réalisation de l'invention, le motoréducteurcomporte des pignons d'axes parallèlescomme illustré [Fig. 3a] ou d'axes perpendiculaires. According to one embodiment of the invention, the geared motor comprises pinions with parallel axes as illustrated [Fig. 3a] or perpendicular axes.
Selon un mode de réalisation de l'invention, l'actionneur de changement de vitesse 70 comporte un engrenage conique, droit ou hélicoïdal et/ou avec un étage ou plus. According to one embodiment of the invention, the gear change actuator 70 comprises a bevel, spur or helical gear and/or with one or more stages.
Selon une variante de réalisation de l'invention, l'actionneur de changement de vitesse 70 a une courroie ou une chaîne ou un cardan ou des pignons. Selon un mode de réalisation de l'invention, le dispositif de changement de vitesse 20 comporte au niveau de l'arbre de sélection40au moinsdeuxcliquets42 et par exemple pour un engin 1 à 7 vitesses, comporte septcliquets42. According to an alternative embodiment of the invention, the gear change actuator 70 has a belt or a chain or a universal joint or sprockets. According to one embodiment of the invention, the speed change device 20 comprises at the level of the selection shaft 40 at least two pawls 42 and for example for a machine 1 to 7 speeds, comprises seven pawls 42.
Selon un mode de réalisation de l'invention, le dispositif de changement de vitesse 20 comporte une série de sept cliquets disposés les uns à la suite des autres selon l'axe longitudinale X2de l'arbre de sélection40. According to one embodiment of the invention, the gear change device 20 comprises a series of seven pawls arranged one after the other along the longitudinal axis X2 of the selection shaft 40.
Selon un mode de réalisation de l'invention, le dispositif de changement de vitesse 20 comporte au moins une série d'au moins sept cliquets disposés les uns à la suite des autres selon l'axe longitudinale X2de l'arbre de sélection40. According to one embodiment of the invention, the gear change device 20 comprises at least one series of at least seven pawls arranged one after the other along the longitudinal axis X2 of the selection shaft 40.
Selon un mode de réalisation de l'invention, le dispositif de changement de vitesse 20 comporte trois séries d'au moins sept cliquets disposés les uns à la suite des autres selon l'axe longitudinale X2 de l'arbre de sélection 40. Les séries étant disposées à 120 degrés l'une de l'autre autour de l'arbre de sélection 40. According to one embodiment of the invention, the gear change device 20 comprises three series of at least seven pawls arranged one after the other along the longitudinal axis X2 of the selection shaft 40. The series being arranged at 120 degrees from each other around the selection shaft 40.
Les cliquets 42 ont une forme configurée pour coopérer avec les pignons d'entrée Fri. Les cliquets 42 sont insérés dans des évidements 420 formés sur l'arbre de sélection 40 par une extrémités 422. Cette extrémité est totalement insérée dans le logement de façon à être plaquée contre la face supérieur 423 du logement 420. Chaque cliquet 42 est associé à un dispositif de soulèvement, et parexemple une bille 43, visible [Fig.4] et [Fig. 6] disposée dans un perçage de l'arbre de sélection40, dépassantà l'intérieurde I'arbre40, placée souschaque cliquet 42 de façon à pouvoirle soulevervia la navette 41. The pawls 42 have a shape configured to cooperate with the Fri input pinions. The pawls 42 are inserted into recesses 420 formed on the selection shaft 40 by one end 422. This end is fully inserted into the housing so as to be pressed against the upper face 423 of the housing 420. Each pawl 42 is associated with a lifting device, and for example a ball 43, visible [Fig.4] and [Fig. 6] arranged in a bore of the selection shaft 40, protruding inside the shaft 40, placed under each pawl 42 so as to be able to lift it via the shuttle 41.
Lorsque la vitesse est sélectionnée, la navette 41 est positionnée sous le pignon d'entrée Fn correspondant au rapport i sélectionné, qui est alors bloqué en rotation par un des cliquets 42, et engrène avec le pignon correspondant de sortie. When the speed is selected, the shuttle 41 is positioned under the input pinion Fn corresponding to the ratio i selected, which is then locked in rotation by one of the pawls 42, and meshes with the corresponding output pinion.
Dans le cadre de l'invention, le maintien des cliquets 42 est réalisée par une bague de maintien 44 illustré [Fig. 5] et [Fig. 6] In the context of the invention, the retention of the pawls 42 is achieved by a retaining ring 44 illustrated [Fig. 5] and [Fig. 6]
Selon un mode de réalisation de l'invention, la bague est en matière élastique. Selon un mode de réalisation de l'invention, la bague 44 est en acier ressort emboutie. Selon un autre mode de réalisation de l'invention, la bague 44 est en plastique. According to one embodiment of the invention, the ring is made of elastic material. According to one embodiment of the invention, the ring 44 is made of stamped spring steel. According to another embodiment of the invention, the ring 44 is made of plastic.
Cette bague de maintien 44 est disposée à l'intérieurde l'arbre de sélection 40. This retaining ring 44 is arranged inside the selection shaft 40.
La bague 44 forme un cylindre plaqué à l'intérieurde l'arbre de sélection 40, contre la surface interne de l'arbre de sélection 40. Le maintien est ainsi réalisé par l'intérieur de l'arbre de sélection 40. Selon un mode de réalisation de l'invention, la bague est ouverte dans le sens longitudinal.The ring 44 forms a cylinder pressed inside the selection shaft 40, against the internal surface of the selection shaft 40. The maintenance is thus achieved by the interior of the selection shaft 40. According to one embodiment of the invention, the ring is open in the longitudinal direction.
La longueur de la bague 44 est déterminée de façon à ce que l'ensemble descliquets42 soit maintenu. The length of the ring 44 is determined so that the set of pawls 42 is maintained.
Selon un mode de réalisation de l'invention, la bague de maintien 44 comporte desouvertures 440 qui coopèrent avec les bi I les 43 placéessous lescliquets. La bague de maintien44 permet ainsi de mainte ni ries bi Iles 43 en place. According to one embodiment of the invention, the retaining ring 44 comprises openings 440 which cooperate with the bi I 43 placed under the pawls. The retaining ring 44 thus makes it possible to maintain or ries bi Islands 43 in place.
Selon un mode de réalisation de l'invention, la bague de maintien 44 comporte au moinsdeux languettes 441 formées à partir de la bague 44. Plus précisément, les languettes 441 sont formées par découpage, emboutissage ou pliage, outoutautre procédé permettant d'obtenir une forme de languette, de la bague de maintien 44. Selon un mode de réalisation la bague de maintien44 comportent autant de Ianguettes441 que de cliquets42. According to one embodiment of the invention, the retaining ring 44 comprises at least two tabs 441 formed from the ring 44. More specifically, the tabs 441 are formed by cutting, stamping or bending, or any other method making it possible to obtain a tab-shaped, of the retaining ring 44. According to one embodiment, the retaining ring 44 comprises as many Ianguettes441 as pawls42.
Chaque languette 441 est disposée sous un cliquet4 au niveau de la partie 422 du cliquet 42 insérée dans le logement 420 formé dans l'arbre de sélection40. Each tongue 441 is arranged under a pawl 4 at the level of the part 422 of the pawl 42 inserted into the housing 420 formed in the shaft of selection40.
La bague de maintien44 permet ainsi de maintenirle cliqueten position fermé. Pour cela, la bague de maintien 44 exerce, par le biais des languettes, sur chaque cliquet 42 une pression, ou force de plaquage, suffisante pour plaquer le cliquet 42 dans le logement 420 tout en lui permettant d'être soulevé par la navette 41. La force de plaquage est définie de façon à contrer l'effet centrifuge surle cliquet42. The retaining ring 44 thus makes it possible to maintain the ratchet in the closed position. For this, the retaining ring 44 exerts, through the tongues, on each pawl 42 a pressure, or pressing force, sufficient to press the pawl 42 into the housing 420 while allowing it to be lifted by the shuttle 41 The pressing force is defined in such a way as to counter the centrifugal effect on the pawl42.
C'est-à-dire que chaque languette 441 appuie sur l'extrémité 422 du cliquet qui est ainsi plaqué contre la face supérieur423 du logement 420, l'autre extrémité 424 du cliquetestainsi libre d'être soulevée parun effet pivot par la bille 43. That is to say that each tab 441 presses on the end 422 of the pawl which is thus pressed against the upper face 423 of the housing 420, the other end 424 of the pawl is also free to be lifted by a pivot effect by the ball 43 .
Selon un mode de réalisation de l 'invention, la bague de maintien44 comporte au moins une série de sept languettes 441 disposées les unes à la suite des autres selon l'axe longitudinale X2 de l'arbre de sélection 40, sous chaque cliquet 42. According to one embodiment of the invention, the retaining ring 44 comprises at least a series of seven tabs 441 arranged one after the other along the longitudinal axis X2 of the selection shaft 40, under each pawl 42.
Selon un mode de réalisation de l'invention, le dispositif de changement de vitesse 20 comporte trois sériesd'au moinssept Ianguettes441 disposées les unesà la suite des autres selon l'axe longitudinaleX2de l'arbre de sélection40. Les séries étant disposéesà 120 degrés l'une de l'autre autourde l'arbre de sélection 40. According to one embodiment of the invention, the gearshift device 20 comprises three series of at least seven tongues 441 arranged one after the other along the longitudinal axis X2 of the selection shaft 40. The series being arranged at 120 degrees from each other around the selection shaft 40.
Selon un mode de réalisation de l 'invention, la bague de maintien 44 comporte au moins une série de sept ouvertures 440 disposées les unes à la suite des autres selon l'axe longitudinale X2 de l'arbre de sélection 40, sous chaque bille 43. Selon un mode de réalisation de l'invention, le dispositif de changement de vitesse 20 comporte trois sériesd'au moins septouvertures 440 disposées les unesà la suite desautres selon l'axe longitudinaleX2de l'arbre de sélection40. Les séries étant disposéesà 120 degrés l'une de l'autre autour de l'arbre de sélection 40. According to one embodiment of the invention, the retaining ring 44 comprises at least a series of seven openings 440 arranged one after the other along the longitudinal axis X2 of the selection shaft 40, under each ball 43 . According to one embodiment of the invention, the gearshift device 20 comprises three series of at least seven openings 440 arranged one after the other along the longitudinal axis X2 of the selection shaft 40. The series being arranged at 120 degrees from each other around the selection shaft 40.
Selon un mode de réalisation de l'invention les séries de languettes 441 et d'ouverture 440 sont intercaléesdans la direction radiale de la bague de maintien 44. According to one embodiment of the invention, the series of tabs 441 and of opening 440 are inserted in the radial direction of the retaining ring 44.
Lors de l'utilisation de l'engin, la navette 41 permet de sélectionner le rapport choisi qui va enclencherun pignon d'entrée Fri via un cliquet42. When using the machine, the shuttle 41 makes it possible to select the chosen ratio which will engage a Fri input pinion via a ratchet42.
Le pignon d'entrée Fri engrène ensuite avec un pignon de sortie Fi. The input pinion Fri then meshes with an output pinion Fi.
Si l'engin 1 roule dans un rapport i, sans en changer, la vis sans fin 21 ne tourne pas. If the machine 1 rolls in a gear i, without changing it, the endless screw 21 does not turn.
Lors d'un changement de rapport de vitesse la vis sans fin 21 est entraînée en rotation par l'actionneurde changement de vitesse 70 provoquant le mouvementaxial de l'écrou 210 de la vis 21 qui entraîne la navette 41 et permet ainsi le passage de rapport. Grâce à la liaison pivot ainsi réalisée le mouvement de rotation de la vis sans fin 21 est transformé en mouvement de translation de la navette 41. During a gear ratio change the worm 21 is driven in rotation by the gear change actuator 70 causing the axial movement of the nut 210 of the screw 21 which drives the shuttle 41 and thus allows the gear change. . Thanks to the pivot connection thus produced, the rotational movement of the endless screw 21 is transformed into a translational movement of the shuttle 41.
Selon un mode de réalisation de l'invention, une butée 211, 211' limite à chaque extrémité le déplacement de la navette 41. Selon un autre mode de réalisation de l'invention, le déplacement de la navette est contrôlé par un capteurde position. According to one embodiment of the invention, a stop 211, 211' limits the movement of the shuttle 41 at each end. According to another embodiment of the invention, the movement of the shuttle is controlled by a position sensor.
Selon un mode de réalisation non illustré, la navette 41 est apte à prendre une position dite position neutre PO pour laquelle aucun rapport de vitesse n'estengagé. According to a non-illustrated embodiment, the shuttle 41 is able to assume a so-called neutral position PO for which no gear ratio is engaged.
La [Fig. 7] illustre plus en détail le boîtier 30 de l'engin de mobilité lde la figure 1. The [Fig. 7] illustrates in more detail the housing 30 of the mobility device of Figure 1.
Le boitier30 comporte un carter 310 délimitant un premierlogement311 agencé pour loger les engrenages du dispositif changement de vitesse 20. Le carter 310 délimite également au moinsdeuxdeuxièmes logements 312, 313, 314, 315, distincts les unsdes autres. L'ensemble de ces logements est agencé pour loger respectivement le moteur électrique 2, le réducteur 11, l'actionneurde changement de vitesse 70 et l'unité de pilotage 4 de l'engin de mobilité. Selon un mode de réalisation de l'invention, au moins un deuxième loge ment est étanche, et par exemple celui agencé pourcontenir l'unité de pilotage 4. The box 30 comprises a casing 310 delimiting a first housing 311 arranged to house the gears of the gearshift device 20. The casing 310 also delimits at least two second housings 312, 313, 314, 315, distinct from each other. All of these housings are arranged to respectively house the electric motor 2, the reduction gear 11, the gearshift actuator 70 and the control unit 4 of the mobility device. According to one embodiment of the invention, at least a second housing is sealed, and for example that arranged to contain the control unit 4.
Selon un mode de réalisation de l'invention, le carter310 logeant le dispositif changement de vitesse 20 estfermé par deux flasques latéraux 317, dont un seul est illustré sur la figure 4. Le premier loge ment 311 présente deux ouvertures en regard dans les flasques latéraux 317 pour accueillirl'axe de pédalierde l'engin de mobilitél. La portée de la présente invention ne se limite pas aux détails donnés ci -dessus et permet des modes de réalisation sous de nombreuses autres formes spécifiques sans s'éloigner du domaine d'application de l'invention. Par conséquent, les présents modes de réalisation doivent être considérés à titre d'illustration, et peuvent être modifiés sans toutefois sortir de la portée définie par les revendications. According to one embodiment of the invention, the casing 310 housing the gearshift device 20 is closed by two side flanges 317, only one of which is illustrated in FIG. 4. The first housing 311 has two facing openings in the side flanges 317 to accommodate the bottom bracket axle of the mobility device. The scope of the present invention is not limited to the details given above and allows embodiments in many other specific forms without departing from the scope of the invention. Therefore, the present embodiments should be considered by way of illustration, and can be modified without departing from the scope defined by the claims.

Claims

REVENDICATIONS
1. Dispositif de changementde vitesse (20) pourengin de mobilité (1) comportant : un arbre de sélection (40) dans lequel sontdisposées une navette (41) et une vis sans fin (21), au moins deux pignons d'entrée (50, Fri) agencés pour tourner librement autour de l'arbre de sélection ( 40 ), au moins deux pignons de sortie (60, Fi) solidaires en rotation d'un arbre creux (80) un actionneur de changementde vitesse (70) agencé pourdéplacerla navette (41) le long de la vis sans fin (21) entre au moinsdeux positions, etengager un rapport sélectionné, au moins deux cliquets (42) disposésau niveau de l'arbre de sélection (40) ,. chaque cliquet (42) étant associé à un dispositif de soulèvement(43) permettant de souleverle cliquetvia la navette (41), et à enclencherle rapport sélectionnervia les pignons d'entrée et de sortie, caractérisé en ce qu'il comporte également une bague de maintien (44) élastique, pour maintenirl'ensemble des cliquets (42) , en place à l'intérieurde l'arbre de sélection (40).1. Gear change device (20) for mobility device (1) comprising: a selection shaft (40) in which are disposed a shuttle (41) and a worm (21), at least two input pinions (50 , Fri) arranged to rotate freely around the selection shaft (40), at least two output pinions (60, Fi) integral in rotation with a hollow shaft (80) a gearshift actuator (70) arranged to move the shuttle (41) along the endless screw (21) between at least two positions, and engage a selected gear, at least two pawls (42) arranged at the level of the selection shaft (40),. each pawl (42) being associated with a lifting device (43) making it possible to lift the pawl via the shuttle (41), and to engage the selected ratio via the input and output pinions, characterized in that it also comprises a maintaining (44) elastic, to maintain the set of pawls (42), in place inside the selection shaft (40).
2. Dispositif de changementde vitesse (20) selon la revendication 1, dans lequel la bague de maintien (44) forme un cylindre plaqué à l'intérieurde l'arbre de sélection (40), contre la surface interne de l'arbre de sélection (40). 2. Gear change device (20) according to claim 1, in which the retaining ring (44) forms a cylinder pressed inside the selector shaft (40), against the internal surface of the selector shaft. (40).
3. Dispositif de changementde vitesse (20) selon la revendication 1 ou2, dans lequel la bague de maintien (44) comporte au moinsdeux languettes (441) forméesà partir de la bague (44). 3. A shifting device (20) according to claim 1 or 2, wherein the retaining ring (44) has at least two tabs (441) formed from the ring (44).
4. Dispositif de changementde vitesse (20) selon une des revendication 1 à 3, dans lequel des languettes (441) sont formées par découpage, emboutissage ou pliage de la bague de maintien (44). 4. Gearshift device (20) according to one of claims 1 to 3, wherein the tabs (441) are formed by cutting, stamping or bending the retaining ring (44).
5. Dispositif de changementde vitesse (20) selon une des revendication 1 à 4, dans lequel chaque languette (441) est disposée sous un cliquet(42) au niveau d'une partie (422) du cliquet (42) insérée dans un logement(420) formé dans l'arbre de sélection (40). 5. A gearshift device (20) according to one of claims 1 to 4, wherein each tab (441) is disposed under a pawl (42) at a portion (422) of the pawl (42) inserted into a housing (420) formed in the selection tree (40).
6. Dispositif de changement de vitesse (20) selon une des revendication 1 à 5, dans lequel la bague de maintien (44) comporte des ouvertures (440) qui coopèrent avec des billes (43) placéessous lescliquets (42). 6. Gear change device (20) according to one of claims 1 to 5, wherein the retaining ring (44) has openings (440) which cooperate with balls (43) placed under the pawls (42).
7. Dispositif de changement de vitesse (20) selon une des revendication 1 à 5, dans lequel la bague de maintien (44) comporte au moins une série de sept languettes (441) disposées lesunes à la suite desautres selon l'axe longitudinaleX2de l'arbre de sélection (40) et au moins une série de sept ouverture s (440) disposées les unes à la suite des autres se Ion l'axe longitudinale (X2) de l'arbre de sélection (40), sous chaque bille (43). 7. A gearshift device (20) according to one of claims 1 to 5, wherein the retaining ring (44) comprises at least a series of seven tabs (441) arranged one after the other along the longitudinal axis X2 of the selection shaft (40) and at least a series of seven openings (440) arranged one after the other on the longitudinal axis (X2) of the selection shaft (40), under each ball ( 43).
8. Dispositif de changementde vitesse (20) selon une des revendication 6 à 7, dans lequel les séries de languettes (441) et d'ouverture (440) sont intercalées dans la direction radiale de la bague de maintien (44). 8. Gearshift device (20) according to one of claims 6 to 7, wherein the series of tabs (441) and opening (440) are interposed in the radial direction of the retaining ring (44).
9. Engin de mobilité (1), notammentenginde mobilité à assistance électrique, comportant un dispositif de changementde vitesse (20) selon l'une quelconque des revendications précédentes. 9. Mobility device (1), in particular electrically assisted mobility device, comprising a gearshift device (20) according to any one of the preceding claims.
10. Engin de mobilité selon la revendication 9, dans lequel l'engin (1) est un vélo à assistance électrique. 10. Mobility device according to claim 9, in which the device (1) is an electrically assisted bicycle.
PCT/EP2022/058320 2021-04-01 2022-03-29 Simplified gearshift device and associated mobility vehicle WO2022207663A1 (en)

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Application Number Priority Date Filing Date Title
FRFR2103418 2021-04-01
FR2103418A FR3121423B1 (en) 2021-04-01 2021-04-01 Simplified shifting device and associated mobility device.

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5924950A (en) * 1997-10-06 1999-07-20 Pusic; Pavo M Even increment, non-overlapping bicycle transmission
FR2865784A1 (en) * 2004-02-03 2005-08-05 Peugeot Citroen Automobiles Sa Radial jaw clutching device for use in gear box, has yoke permitting to move pins from retracted position to engagement position and mounted rotatably on swivel mounted on screw, and pinion, endless screw and engine rotating screw and yoke
FR2913661A1 (en) 2007-03-16 2008-09-19 Guy Cavalerie Speed changing device for e.g. star wheel gear box, of bicycle, has series of openings housing pistons, balls or ratchet raising system, other series of openings partially engaging indexing balls, and tertiary pinions assembled on wheel
FR2975367A1 (en) 2011-05-18 2012-11-23 Guy Cavalerie DEVICE FOR CHANGING SPEEDS FOR BICYCLES
DE102017008376B3 (en) * 2016-12-06 2018-03-08 Jürgen Karrenberg Multi-speed powershift transmission, preferably for vehicles with foot gear
WO2020174025A1 (en) * 2019-02-27 2020-09-03 Intra Drive Ltd Transmissions for machines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5924950A (en) * 1997-10-06 1999-07-20 Pusic; Pavo M Even increment, non-overlapping bicycle transmission
FR2865784A1 (en) * 2004-02-03 2005-08-05 Peugeot Citroen Automobiles Sa Radial jaw clutching device for use in gear box, has yoke permitting to move pins from retracted position to engagement position and mounted rotatably on swivel mounted on screw, and pinion, endless screw and engine rotating screw and yoke
FR2913661A1 (en) 2007-03-16 2008-09-19 Guy Cavalerie Speed changing device for e.g. star wheel gear box, of bicycle, has series of openings housing pistons, balls or ratchet raising system, other series of openings partially engaging indexing balls, and tertiary pinions assembled on wheel
FR2975367A1 (en) 2011-05-18 2012-11-23 Guy Cavalerie DEVICE FOR CHANGING SPEEDS FOR BICYCLES
DE102017008376B3 (en) * 2016-12-06 2018-03-08 Jürgen Karrenberg Multi-speed powershift transmission, preferably for vehicles with foot gear
WO2020174025A1 (en) * 2019-02-27 2020-09-03 Intra Drive Ltd Transmissions for machines

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FR3121423B1 (en) 2023-06-16
FR3121423A1 (en) 2022-10-07

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