WO2000008356A1 - Appareil et technique permettant de solidariser un corps et un arbre et de les desolidariser - Google Patents

Appareil et technique permettant de solidariser un corps et un arbre et de les desolidariser Download PDF

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Publication number
WO2000008356A1
WO2000008356A1 PCT/AU1999/000629 AU9900629W WO0008356A1 WO 2000008356 A1 WO2000008356 A1 WO 2000008356A1 AU 9900629 W AU9900629 W AU 9900629W WO 0008356 A1 WO0008356 A1 WO 0008356A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotational direction
actuable engagement
counter
engagement
actuable
Prior art date
Application number
PCT/AU1999/000629
Other languages
English (en)
Inventor
William Wesley Martin
Original Assignee
Preload International Limited
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
Priority claimed from AUPP5035A external-priority patent/AUPP503598A0/en
Priority claimed from AUPQ0131A external-priority patent/AUPQ013199A0/en
Priority claimed from AUPQ1484A external-priority patent/AUPQ148499A0/en
Application filed by Preload International Limited filed Critical Preload International Limited
Priority to AU51414/99A priority Critical patent/AU5141499A/en
Publication of WO2000008356A1 publication Critical patent/WO2000008356A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D41/00—Freewheels or freewheel clutches
    • F16D41/12—Freewheels or freewheel clutches with hinged pawl co-operating with teeth, cogs, or the like
    • F16D41/14—Freewheels or freewheel clutches with hinged pawl co-operating with teeth, cogs, or the like the effective stroke of the pawl being adjustable
    • 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
    • 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
    • F16H2063/3046—Constructional features of the final output mechanisms the final output mechanisms comprising elements moved by electrical or magnetic force using electromagnetic clutch for coupling gear wheel to 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
    • 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

Definitions

  • the present invention relates to a method and apparatus for engaging and disengaging a rotatable body from a shaft about which it is provided. More particularly, the present invention relates to a method and apparatus for engaging and disengaging a rotatable body from a shaft, at least in part by a magnetic field.
  • rotatable bodies provided about a shaft are typically provided with several means for actuable engagement of the rotatable body with the shaft in the rotational direction, and several means for actuable engagement of the rotatable body with the shaft in the counter-rotational direction. It is highly advantageous to ensure that all means for actuable engagement of the rotatable body with the shaft in the rotational direction are activated simultaneously, and all means for actuable engagement of the rotatable body with the shaft in the counter-rotational direction are also activated simultaneously.
  • simultaneous actuation may be achieved by the action of a non-rotating solenoid assembly on one or more rotating lock rings, as disclosed in International Patent Application PCT/AU98/00181 (WO 98/41779).
  • rotatable bodies may be engaged or disengaged from the shaft by way of one or more rotating solenoid assemblies that maintain their position relative to the means for actuable engagement.
  • This approach necessitates the incorporation of one or more slip ring assemblies into the shaft system to enable current to be delivered to the solenoid or solenoids.
  • rotatable bodies may be engaged or disengaged by way of one of several static solenoid assemblies situated about the circumference of the rotating shaft such that the means for actuable engagement integral therewith may be actuated as an actuating device passes by the core of a coil. This method necessitates complicated windings.
  • the method and apparatus for engaging and disengaging rotatable bodies of the present invention have, as one object thereof, to substantially overcome the above-mentioned problems associated with the prior art.
  • an apparatus for engaging and disengaging a rotatable body with or from a shaft about which the rotatable body is provided the apparatus being characterised by one or more electromagnetic field generating means and one or more magnetically susceptible elements, wherein the or each electromagnetic field generating means is arranged with respect to the or each magnetically susceptible element so as to allow the or each electromagnetic field generating means to act on the or each magnetically susceptible element, causing such to move relative thereto, and thereby causing the actuation or deactuation of one or more means for actuable engagement of the rotatable body with the shaft.
  • At least one electromagnetic field generating means per rotatable body.
  • one electromagnetic field generating means per rotatable body.
  • two electromagnetic field generating means per rotatable body.
  • each means for actuable engagement has associated therewith a counterweight assembly, the counterweight assembly being radially opposed to the means for actuable engagement and adapted to substantially balance the weight of such.
  • the or each means for actuable engagement has associated therewith one or more permanent magnets adapted, in the absence of an electromagnetic field generated by the or each electromagnetic field generating means, to maintain the means for actuable engagement in a deactuated condition.
  • the means for actuable engagement of the rotatable body with the shaft comprises at least one means for actuable engagement in a rotational direction, and at least one means for actuable engagement in a counter-rotational direction, such that actuation of both the or each means for actuable engagement in the rotational direction and the or each means for actuable engagement in the counter-rotational direction causes the rotatable body to rotate in conjunction with the shaft and prevents such from counter-rotating relative to the shaft, deactuation of both the or each means for actuable engagement in the rotational direction and the or each means for actuable engagement in the counter-rotational direction allows the rotatable body to rotate independently of the shaft and counter-rotate relative to the shaft, actuation of the or each means for actuable engagement in the rotational direction and deactuation of the or each means for actuable engagement in the counter-rotational direction causes the rotatable body to rotate in conjunction with the shaft and allows such to counter rotate relative to the shaft, and actuation
  • At least one magnetically susceptible element relative to the means for actuable engagement in the rotational direction, and at least one magnetically susceptible element relative to the means for actuable engagement in the counter-rotational direction.
  • the electromagnetic field generating means is provided in the form of an electromagnetic coil.
  • the or each magnetically susceptible means is provided in the form of a permanent magnet.
  • the or each magnetically susceptible means is provided in the form of a portion of magnetically susceptible material or an alloy containing such.
  • one electromagnetic field generating means per rotatable body in the form of an electromagnetic coil and the or each magnetically susceptible element is provided in the form of a permanent magnet
  • the or each permanent magnet is preferably located adjacent a face of the electromagnetic coil, such that the magnetic dipole of the or each permanent magnet is substantially parallel to the axis thereof.
  • the or each magnetically susceptible element is provided in the form of a permanent magnet
  • the or each permanent magnet is preferably located adjacent a circumference one of said electromagnetic coils, such that the magnetic dipole of the or each permanent magnet is substantially parallel to the axes thereof.
  • each rotatable body is provided both with means for actuable engagement in the rotational direction and means for actuable engagement in the counter-rotational direction
  • a single electromagnetic field generating means is provided per pawl gear wheel in the form of an electromagnetic coil
  • the or each magnetically susceptible element is provided in the form of a permanent magnet
  • the electromagnetic coil is interposed between the or each permanent magnet associated with the means for actuable engagement in the rotational direction and the or each permanent magnet associated with the means for actuable engagement in the counter- rotational direction
  • the magnetic dipoles of the or each permanent magnet associated with the means for actuable engagement in the rotational direction are of opposite direction relative to the magnetic dipoles of the or each equivalent permanent magnet associated with means for actuable engagement in the counter-rotational direction
  • each rotatable body is provided with both means for actuable engagement in the rotational and the counter-rotational directions
  • the electromagnetic coil is interposed between the or each permanent magnet associated with the means for actuable engagement in the rotational direction and the or each permanent magnet associated with the means for actuable engagement in the counter-rotational direction
  • the magnetic dipoles of the or each permanent magnet associated with the means for actuable engagement in the rotational direction are of the same direction as the magnetic dipoles of the or each equivalent permanent magnet associated with the means for actuable engagement in the counter-rotational direction
  • each gear wheel is provided with two electromagnetic coils and where each gear wheel is provided both with means for actuable engagement in the rotational direction and means for actuable engagement in the counter-rotational direction
  • the or each permanent magnet associated with the means for actuable engagement in the rotational direction is preferably located about a circumference of one electromagnetic coil, whilst the or each permanent magnet associated with the means for actuable engagement in the counter rotational direction is located about a circumference of the other electromagnetic coil.
  • each rotatable body has associated therewith two or more means for actuable engagement in the rotational direction
  • the actuation of the means for actuable engagement in the rotational direction is at least partially governed by a mechanical synchronisation means.
  • the actuation of means for actuable engagement in the counter-rotational direction is at least partially governed by a mechanical synchronisation means.
  • the means for actuable engagement in the rotational direction is provided in the form of one or more forward pawl members
  • the means for actuable engagement in the counter-rotational direction is provided in the form of one or more reverse pawl members
  • the or each forward pawl member is adapted to engage a leading surface of a substantially complimentary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member
  • the or each reverse pawl member is adapted to engage a trailing surface of a substantially complimentary recess in an opposed surface positively during rotation of that opposed surface with respect to the pawl member.
  • each forward or reverse pawl member there are provided two permanent magnets for the or each forward or reverse pawl member.
  • the two permanent magnets associated with the or each forward or reverse pawl member are held in fixed position relative to one another.
  • the permanent magnets are preferably located on opposite sides of the axis of the electromagnetic coil and such that their magnetic dipoles are opposite, and substantially parallel to, the axis of the electromagnetic coil.
  • one permanent magnet for the or each forward or reverse pawl member there is provided one permanent magnet for the or each forward or reverse pawl member.
  • the means for actuable engagement in the rotational and counter-rotational directions are provided in the form of forward and reverse pawls respectively, where the or each forward or reverse pawl has one permanent magnet associated therewith, and where each forward or reverse pawl has associated therewith a counterweight assembly, the permanent magnet is provided in the counterweight assembly, the counterweight assembly associated with each forward or reverse pawl member being located on the opposite side of the axis of the electromagnetic coil to the forward or reverse pawl member and being operatively connected therewith.
  • the counterweight assembly is formed separately from the forward or reverse pawl member, and is adapted to at least partially receive such.
  • the counterweight assembly is adapted to partially receive the forward or reverse pawl member, with a leading portion of the forward or reverse pawl member projecting therefrom.
  • each gear wheel is provided with two electromagnetic coils
  • each gear wheel is provided with means for actuable engagement in the rotational direction, and means for actuable engagement in the counter-rotational direction in the form of forward and reverse pawl members respectively
  • each forward or reverse pawl member has two permanent magnets associated therewith held in fixed position relative to one another
  • the permanent magnets associated with a single forward or reverse pawl member are preferably located adjacent to the circumference the same electromagnetic coil.
  • An apparatus characterised in that the two permanent magnets associated with each forward or reverse pawl member have magnetic dipole moments of opposite direction, and are held in fixed position relative to each other on opposite sides of a pivot means.
  • each gear wheel has associated therewith two or more forward pawl members, and two or more reverse pawl members
  • the actuation of the forward pawl members and the reverse pawl members is preferably governed at least partially by a mechanical synchronisation means
  • the or each mechanical synchronisation means comprises a connector pin, fixed to each counterweight assembly, and a synchronising plate in which there are provided a number of slots equal to the number of connecting pins wherein the connecting pins are slidably engaged within the slots.
  • the permanent magnets are Samarium- Cobalt type magnets.
  • the means for actuable engagement comprises a roller clutch arrangement whereby engagement between the rotatable body and the shaft about which such is provided is achieved in both rotational and counter- rotational directions.
  • the rotatable body is provided in the form of a gear wheel.
  • the method more specifically comprises steps of: -
  • the method more specifically comprises the steps of:
  • Figure 1 is a simplified diagrammatic representation of an axial cross section of an apparatus for the engaging and disengaging of a rotatable body in accordance with a first embodiment of the present invention, showing in particular the location of forward and reverse pawl actuator assemblies adjacent to the faces of an electromagnet assembly;
  • Figure 2 is a representation of a radial cross section of the apparatus of Figure 1 , showing in particular the arrangement of forward pawl actuator assemblies about a central wiring conduit;
  • Figure 3 is a simplified diagrammatic representation of an axial cross section of an apparatus for the engaging and disengaging of a rotatable body in accordance with a second embodiment of the present invention, showing in particular the location of forward and reverse pawl actuator assemblies about the circumference of first and second electromagnet assemblies;
  • Figure 4 is a representation of a portion of a radial cross section of the apparatus of Figure 3, showing in particular an actuator assembly containing permanent magnets pivotally attached to a flange;
  • Figure 5 is a partial perspective view of an apparatus for the engaging and disengaging of a rotatable body in accordance with a third embodiment of the present invention, showing forward and reverse pawls in an engaged position
  • Figure 6 is a partial perspective view of the apparatus of Figure 5, showing the forward and reverse pawls in a disengaged position
  • Figure 7 is an exploded view of an actuator assembly of the apparatus of Figures 5 and 6.
  • FIGs 1 and 2 there is shown an apparatus for engaging and disengaging a rotatable body 10, comprising a shaft 12 having a hollow central bore 14, located coaxially within which is a static wiring conduit 16.
  • a series of rotatable bodies in the form of gear wheels 18 are provided about the shaft, such that the gear wheels 18 may rotate freely and independently thereabout, as can best be seen in Figure 1.
  • the reverse pawls 22 are oriented in the opposite manner to the forward pawls 20.
  • the forward and reverse pawls 20 and 22 are pivotally attached to the shaft 12 by known means.
  • each gear wheel 18 Provided in the inner surface 24 of each gear wheel 18 are a series of three arcuate recesses 26, each adapted to receive a forward pawl 20. Interposed between the arcuate recesses 26 in the inner surface 24 of each gear wheel 18 are three further arcuate recesses 28, each adapted to receive a reverse pawl 22.
  • electromagnet assemblies 30 Located about the wiring conduit 16 such that their magnetic dipole moments are substantially parallel thereto are a series of electromagnetic field generating means in the form of electromagnet assemblies 30, each comprising a wound copper coil and a former assembly.
  • the number of electromagnet assemblies 30 corresponds to one per gear wheel 18.
  • Current reaches the electromagnet assemblies 30 by way of wiring 32 situated within the wiring conduit 16, as can best be seen in Figure 1.
  • each electromagnet assembly 30 Adjacent to a face 29 of each electromagnet assembly 30, and situated about the wiring conduit 16 although in no way fixed thereto, are three forward pawl actuator assemblies 34, each connected to a single forward pawl 20 by way of a connecting rod 36.
  • each forward pawl actuator assembly 34 in turn comprises magnetically susceptible elements in the form of a first permanent magnet 38 and a second permanent magnet 40, held in fixed position relative to each other by a framework 42.
  • Each framework 42 is adapted to allow radial movement of the forward pawl actuator assemblies 34 without interference by the wiring conduit 16. The distribution of mass within the frameworks 42 is such that centrifugal forces generated by the rotation of such with the shaft 12 are evenly balanced.
  • each framework 42 positions the first and second permanent magnets 38 and 40 in a radially opposed manner relative to the dipole moment of the electromagnet assembly 30, and such that the dipole moments of the first and second permanent magnets 38 and 40 are substantially parallel to the dipole moment of the electromagnet assembly 30.
  • the first and second permanent magnets 38 and 40 are fixed within the framework 42 such that the dipole moments thereof, whilst substantially parallel, are in opposite direction.
  • each electromagnet assembly 30 Adjacent to an opposing face 43 of each electromagnet assembly 30, on the opposite side thereof to the forward pawl actuator assemblies 34 are three reverse pawl actuator assemblies 44, each connected to a single reverse pawl 22 by way of a connecting rod 46.
  • Each reverse pawl actuator assembly 44 in turn comprises a first permanent magnet 48 and a second permanent magnet 50, held in fixed position relative to each other by a framework 52.
  • Each framework 52 is adapted to allow radial movement of the reverse pawl actuator assemblies 44 without interference by the wiring conduit 16.
  • each framework 52 positions the first and second permanent magnets 48 and 50 in a radially opposed manner relative to the dipole moment of the electromagnet assembly 30, and such that the dipole moments of the first and second permanent magnets 48 and 50 are substantially parallel to the dipole moment of the electromagnet assembly 30.
  • the first and second permanent magnets 48 and 50 are fixed within the framework 52 such that the dipole moments thereof, whilst substantially parallel, are in opposite direction.
  • the dipole moments of the permanent magnets 48 and 50 of the reverse pawl actuator assemblies are of opposite the same configuration and orientation to those of the permanent magnets 38 and 40 of the corresponding forward pawl actuator assemblies.
  • the permanent magnets 53 are circumferentially spaced to coincide with the frameworks 52 and 42 and are adapted to hold such in position in the absence of an electromagnetic field generated by the electromagnet assembly 30.
  • the temporary application of current in a particular direction through a selected electromagnet assembly 30 thus enables simultaneous engagement of the forward pawls 20 with the arcuate recesses 26 in the inner surface 24 of a selected gear wheel 18, and disengagement of the reverse pawls 22 from the arcuate recesses 28 in the inner surface 24 of the same gear wheel 18.
  • Application of the current in the opposite direction will have the opposite effect.
  • the effect of the magnetic interactions is thus the action of the forward pawl actuator assemblies on the connecting rods 36, causing the connecting rods 36 to in turn cause the forward pawls 20 to engage with the arcuate recesses 26 in the inner surface 24 of the selected gear wheel 18.
  • the forward pawls 20 are maintained in position by way of centrifugal forces.
  • the reverse pawl actuator assemblies 44 are caused to retract the reverse pawls 22. Being located at the opposite pole of the temporary dipole induced by the application of current to the electromagnet assembly 30, the south pole of the first permanent magnet 48 is repelled radially outward, whilst the north pole of the second permanent magnet is attracted radially inward, causing the reverse pawl actuator assemblies 44 to act on the connector rods 46 and thereby retract the reverse pawls 22.
  • the permanent magnets 53 ensure the forward and reverse pawls 20 and 22 are maintained in a retracted position.
  • FIGs 3 and 4 there is shown an apparatus for engaging and disengaging gear wheels 54 in accordance with a second embodiment of the present invention.
  • the means for engaging and disengaging gear wheels 54 is substantially similar to the means for engaging and disengaging gear wheels 10 hereinbefore described, and like numerals denote like parts.
  • Each gear wheel 18 has associated therewith first and second electromagnet assemblies 56 and 58
  • Each electromagnet assembly 56 or 58 is capable of independent activation by way of current delivered by way of the wiring 32 passing through the wiring conduit 16.
  • each forward pawl 20, and integral with the shaft 12 is an internal flange 60, pivotally attached to which is a forward pawl actuator assembly 62, having first and second ends 64 and 66.
  • a forward pawl actuator assembly 62 having first and second ends 64 and 66.
  • a first permanent magnet 70 Provided about the first end 64 of the forward pawl actuator assembly 62 is a first permanent magnet 70, and situated about the second end 66 is a second permanent magnet 72, such that the point of attachment of the forward pawl actuator assembly 62 to the internal flange 60 is interposed between the first and second permanent magnets 70 and 72
  • the distribution of mass within the forward pawl actuator assembly 62 is such that centrifugal forces generated by the rotation of such with the shaft 12 are evenly balanced
  • Each forward pawl actuator assembly 62 is adapted so as to align first and second permanent magnets 64 and 66 with the circumference of the first electromagnet assembly 56, such that their dipole moments are parallel to the axis thereof, although in opposite directions.
  • each forward pawl actuator assembly 62 Attached to the second end 66 of each forward pawl actuator assembly 62 is a connecting rod 74, linking each forward pawl actuator assembly 62 with a forward pawl 20
  • the temporary application of current in a particular direction through a selected first electromagnet assembly 56 thus enables engagement of the forward pawls 20 with the arcuate recesses 26 in the inner surface 24 of a selected gear wheel 18, whilst application of the current in the opposite direction will cause the forward pawls 20 to be retracted therefrom The forward pawls 20 are maintained in position by way of centrifugal forces
  • reverse pawls 22 can be controlled by way of the second electromagnet assembly 58 by analogous means.
  • the apparatus for engaging and disengaging gear wheels 10 and 54 may be provided without the second permanent magnets 40, 50 and 66.
  • FIG. 5 to 7 there is shown an apparatus for engaging and disengaging gear wheels 76 in accordance with a third embodiment of the present invention.
  • the means for engaging and disengaging gear wheels 76 is substantially similar to the apparatus 10 and 54 hereinbefore described, and like numerals denote like parts.
  • the apparatus 76 comprises a shaft 12 having a hollow central bore 14, about which are provided gear wheels 18, such that the gear wheels 18 may rotate freely and independently about the shaft, as can best be seen in Figure 5.
  • a number of forward pawls 20 corresponding to three per gear wheel 18.
  • a number of reverse pawls 22 are oriented in the opposite manner to the forward pawls 20.
  • each gear wheel 18 Provided in the inner surface 24 of each gear wheel 18 are a series of three arcuate recesses 26, each adapted to receive a forward pawl 20. Interposed between the arcuate recesses 26 in the inner surface 24 of each gear wheel 18 are three further arcuate recesses 28, each adapted to receive a reverse pawl 22.
  • electromagnet assemblies 30 Located in the hollow central bore 14 of the shaft 12, such that their magnetic dipole moments are substantially parallel thereto, are a series of electromagnet assemblies 30, each comprising a wound copper coil and a former assembly. The number of electromagnet assemblies 30 corresponds to one per gear wheel 18.
  • each electromagnet assembly 30 Adjacent to a face 29 of each electromagnet assembly 30, and situated about the wiring conduit 16 although in no way fixed thereto, are three forward pawl actuator assemblies 34, each in communication with a single forward pawl 20. Adjacent to an opposing face (not shown) of each electromagnet assembly 30, on the opposite side thereof to the forward pawl actuator assemblies 34 are three reverse pawl actuator assemblies 44 of identical configuration to the forward pawl actuator assemblies 34.
  • each forward and reverse pawl actuator assembly 34 or 44 comprises a counterweight 78, pivotally attached to a pawl seat 80 by way of an actuating rod 82.
  • Each counterweight 78 is provided with a connector pin 84, and contains a Samarium-Cobalt permanent magnet (not shown) configured such that the dipole moment of the permanent magnet is substantially parallel to that of the electromagnet assembly 30.
  • the dipole moments of the permanent magnets of the counterweights 78 of the forward pawl actuator assemblies 34 are of opposite direction to those of the reverse pawl actuator assemblies 44, such that the temporary application of current through the electromagnet assembly 30 causes the counterweights 78 thereof to simultaneously be drawn to, or repelled from such.
  • the counterweights 78 of each of the forward pawl actuator assemblies 34 are operatively interconnected by way of their connector pins 84 engaging slots 86 in a first synchronising plate 80, ensuring the simultaneous deployment or retraction of the forward pawls 20.
  • the counterweights 78 of each of the reverse pawl actuator assemblies 44 are operatively interconnected by way of their connector pins 84 engaging slots (not shown) in a second synchronising plate (not shown), ensuring the simultaneous deployment or retraction of the reverse pawls 22.
  • the pawl seat 80 of each forward or reverse pawl actuator assembly 34 or 44 comprises a hinge pin 86, by which the pawl seat 80 is pivotably attached to the shaft 12, and is adapted to partially receive a forward or reverse pawl 20 or 22 such that a leading portion 88 thereof extends therefrom.
  • a user who wishes to change up from a first gear to a second gear under acceleration, where the engagement of at least one gear wheel of each of the gear wheel pairs comprising the first and second gears both the first gear and the second gear is controlled by the apparatus for engaging and disengaging gear wheels 76, first applies a current to the electromagnet assembly 30 of the first gear in such a direction that the counterweights 78 of both the forward and reverse pawl actuator assemblies 34 and 44 are attracted radially inward.
  • the reverse pawls 22 are not under load, and are drawn inward, disengaging from the arcuate recesses 28 in the inner surface 24 of the gear wheel 18 of the first gear However, the forward pawls 20 are under load and, despite the attraction, remain engaged with the arcuate recesses 26 The user then applies current to the electromagnet assembly 30 of the second gear in such a direction that the counterweights 78 of both the forward and reverse pawl actuator assemblies 34 and 44 are repelled radially outward
  • the forward pawls 20 will engage the arcuate recesses 26 prior to the reverse pawls 22 engaging the arcuate recesses 28 Finally, once the forward pawls 20 of the second gear are bearing load, the forward pawls 20 of the first gear will be overdriven and spontaneously retract
  • the forward and reverse pawl actuator assemblies 34 and 44 be formed from an inexpensive material such as cast alloy
  • the apparatus for engaging and disengaging gear wheels 10, 54 and 54 70 may be used in conjunction with an apparatus for controlling the engagement and disengagement of gear wheels, such as that described in our co-pending International Application titled “METHOD AND APPARATUS FOR CONTROLLING THE ENGAGEMENT AND DISENGAGEMENT OF GEAR WHEELS", filed contemporaneously with this application

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

Abstract

Cet appareil permettant de solidariser un corps rotatif (18) et un arbre (12) et de les désolidariser, ce corps rotatif se trouvant autour de l'arbre, se caractérise par la présence d'un ou de plusieurs dispositifs de génération de champ électromagnétique (30) ainsi que par celle d'un ou de plusieurs éléments à sensibilité électromagnétique (38, 40). Le dispositif ou chaque dispositif de génération de champ électromagnétique (30) est installé, par rapport à l'élément ou à chaque élément à sensibilité magnétique (38, 40), de manière à agir sur cet élément ou sur chaque élément (38, 40) les faisant se déplacer relativement à lui et, partant, activant ou désactivant un ou plusieurs dispositifs permettant de solidariser (20, 22) le corps rotatif (18) et l'arbre (12).
PCT/AU1999/000629 1998-08-04 1999-08-04 Appareil et technique permettant de solidariser un corps et un arbre et de les desolidariser WO2000008356A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU51414/99A AU5141499A (en) 1998-08-04 1999-08-04 Method and apparatus for engaging and disengaging a body from a shaft about which it is provided

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
AUPP5035A AUPP503598A0 (en) 1998-08-04 1998-08-04 Method and apparatus for engaging and disengaging gear wheels
AUPP5035 1998-08-04
AUPQ0131 1999-05-04
AUPQ0131A AUPQ013199A0 (en) 1999-05-04 1999-05-04 Gearbox pawl syncro system
AUPQ1484A AUPQ148499A0 (en) 1999-07-07 1999-07-07 Method and apparatus for engaging and disengaging gear wheels
AUPQ1484 1999-07-07

Publications (1)

Publication Number Publication Date
WO2000008356A1 true WO2000008356A1 (fr) 2000-02-17

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002075179A1 (fr) * 2001-03-15 2002-09-26 Valeo Dispositif de transmission automatisee a transfert de couple, en particulier pour vehicule automobile
DE102006009606A1 (de) * 2006-03-02 2007-09-06 Zf Friedrichshafen Ag Elektromagnetische Schalteinrichtung mit Linearmotor
WO2009068853A1 (fr) * 2007-11-27 2009-06-04 Zeroshift Limited Système de transmission
WO2016057640A3 (fr) * 2014-10-07 2016-06-02 Magna Powertrain Of America, Inc. Appareil d'embrayage électro-mécanique
TWI796173B (zh) * 2022-03-18 2023-03-11 明揚創意科技有限公司 可自由換檔的齒輪變速箱
WO2024061862A1 (fr) * 2022-09-21 2024-03-28 Magna Pt B.V. & Co. Kg Embrayage à roue libre à prise automatique pour une chaîne cinématique de véhicule automobile

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WO1998041779A1 (fr) * 1997-03-19 1998-09-24 Preload Gearbox Ltd. Boite d'engrenage a prise constante a precharge

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002075179A1 (fr) * 2001-03-15 2002-09-26 Valeo Dispositif de transmission automatisee a transfert de couple, en particulier pour vehicule automobile
US6978692B2 (en) 2001-03-15 2005-12-27 Valeo Embrayages Automated transmission device with torque transfer, in particular for a motor vehicle
DE102006009606A1 (de) * 2006-03-02 2007-09-06 Zf Friedrichshafen Ag Elektromagnetische Schalteinrichtung mit Linearmotor
US8001865B2 (en) 2006-03-02 2011-08-23 Zf Friedrichshafen Ag Electromagnetic shifting device comprising a linear motor
WO2009068853A1 (fr) * 2007-11-27 2009-06-04 Zeroshift Limited Système de transmission
WO2016057640A3 (fr) * 2014-10-07 2016-06-02 Magna Powertrain Of America, Inc. Appareil d'embrayage électro-mécanique
CN107076223A (zh) * 2014-10-07 2017-08-18 麦格纳动力系有限公司 机电离合器装置
CN107076223B (zh) * 2014-10-07 2019-02-19 麦格纳动力系有限公司 机电离合器装置
US10851851B2 (en) 2014-10-07 2020-12-01 Magna Powertrain Inc. Electro-mechanical clutch apparatus
TWI796173B (zh) * 2022-03-18 2023-03-11 明揚創意科技有限公司 可自由換檔的齒輪變速箱
WO2024061862A1 (fr) * 2022-09-21 2024-03-28 Magna Pt B.V. & Co. Kg Embrayage à roue libre à prise automatique pour une chaîne cinématique de véhicule automobile

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