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
  • F16H48/00—Differential gearings
  • F16H48/20—Arrangements for suppressing or influencing the differential action, e.g. locking devices
  • F16H48/30—Arrangements for suppressing or influencing the differential action, e.g. locking devices using externally-actuatable means
  • F16H48/34—Arrangements for suppressing or influencing the differential action, e.g. locking devices using externally-actuatable means using electromagnetic or electric actuators
• • 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
  • F16H48/00—Differential gearings
  • F16H48/06—Differential gearings with gears having orbital motion
  • F16H48/08—Differential gearings with gears having orbital motion comprising bevel gears
• • 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
  • F16H48/00—Differential gearings
  • F16H48/20—Arrangements for suppressing or influencing the differential action, e.g. locking devices
  • F16H48/24—Arrangements for suppressing or influencing the differential action, e.g. locking devices using positive clutches or brakes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
  • B60Y2200/00—Type of vehicle
  • B60Y2200/90—Vehicles comprising electric prime movers
  • B60Y2200/91—Electric vehicles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Y—INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
  • B60Y2200/00—Type of vehicle
  • B60Y2200/90—Vehicles comprising electric prime movers
  • B60Y2200/92—Hybrid vehicles

Definitions

• the invention relates to an electromagnetic actuation device for a torque transmission system.
• the invention relates to the field of torque transmission systems for vehicles, in particular for electric or hybrid vehicles.
• the invention relates in particular to a transmission system incorporating a differential drive device aimed at transmitting and distributing a torque coming from an engine to two wheel drive shafts of an axle of the vehicle.
• Electrodes used to actuate coupling devices of the dog clutch type, in particular in transmission systems incorporating a differential. These actuators can be controlled according to signals emitted by a sensor, which are representative of the position of the coupling device.
• the sensors detect the position of a sensing target that moves with the moving part of the coupling device. This target is driven in rotation by the coupling device when the latter is closed.
• a rotating target is not satisfactory because it must have an annular shape to be able to be located permanently opposite the sensor, which makes the device heavier and more cumbersome. Due to its larger wingspan, the target can also be stressed by oil flows likely to cause micro displacements of the target which are undesirable.
• the document WO08024333 discloses an electromagnetic actuation device in which a plunger is moved axially to engage or disengage a dog clutch.
• a detection target is carried by the diver to determine the position of the dog clutch.
• This electromagnetic actuation device is characterized by the presence of a frame in which are housed the coil, the magnetic carcass 60/62 and the plunger 26 of the actuator.
• a sensor arranged opposite the target is mounted on this frame.
• the carcass has an annular opening that the plunger “closes” by moving axially.
• the plunger is arranged partly radially outside the magnetic carcass and thus transmits the magnetic flux produced around the coil.
• the target is carried by a lug which passes radially through a notch in the frame.
• One idea underlying the invention is to provide an actuation device that is simpler and/or less bulky.
• the invention provides an electromagnetic actuation device for a torque transmission system, the electromagnetic actuation device comprising a frame arranged around an axis X, the frame being fixed with respect to the X axis and comprising walls defining an annular cavity inside which are housed a coil and, at least in part, a plunger which is able to move axially along the X axis to actuate a coupling device .
• the carcass further comprises a recess and the actuating device comprises a detection lug fixed to the plunger and passing through this recess, the detection lug being able to be detected by a sensor so as to generate a signal representing the axial position of the plunger.
• the relative rotation of the plunger with respect to the carcass along the X axis can be prevented or limited thanks to the cooperation of the detection tab and the recess. Since the detection tab is not rotatable with respect to the casing and the sensor, it is possible to dispense with a circular target and thus limit the size of the device. Furthermore, the positioning of the plunger in the carcass makes it possible to simplify the structure of the actuation device, in particular by dispensing with an additional frame. In addition, by placing the plunger inside the casing, the plunger is protected during the assembly phase and it is possible to center the actuator from the outside in the casing.
• Such an electromagnetic actuation device may comprise one or more of the following characteristics:
• the casing comprises, seen in a plane comprising the X axis, a first side wall arranged around the X axis, a second side wall arranged around the X axis and axially spaced from the first side wall, a radially inner wall arranged around the X axis and connecting the first side wall to the second wall side, at least one radially outer wall arranged around the axis X and extending axially from at least one of the first side wall and the second side wall, the plunger being arranged radially inside the radially outer and radially outside the radially inner wall.
• the actuation device is configured to generate a magnetic flux rotating around the coil section, according to a plane comprising the X axis, the magnetic flux substantially following the walls of the carcass.
• the magnetic flux produced by the coil moves the plunger from the retracted position to the deployed position.
• the carcass is able to conduct the magnetic flux generated by the coil. In other words, it is a magnetic carcass.
• the carcass is a magnetic armature.
• the carcass and the plunger in the deployed position cause the magnetic flux generated by the coil to circulate around the section of the coil.
• the carcass is made at least in part in a ferromagnetic material.
• the carcass is made entirely of a ferromagnetic material.
• the plunger is made at least in part in a ferromagnetic material. [0022]
• the plunger is made entirely of a ferromagnetic material.
• the carcass is a hollow member having an axis of revolution along the X axis.
• the carcass comprises an annular opening arranged around the axis X, the plunger being able to engage in at least a portion of this annular opening when the coil is supplied with current beyond a first threshold predetermined (in particular beyond a first predetermined intensity threshold).
• the portion of the plunger capable of engaging in the annular opening is located radially outside a radially inner edge of the coil.
• the portion of the plunger capable of engaging in the annular opening is located radially outside the coil.
• the coil can have a smaller diameter, which reduces the cost of the solution.
• the plunger moves axially to close the magnetic flux around the coil section, considered in a plane comprising the X axis, when the coil is supplied with current beyond the first predetermined threshold.
• the annular opening is arranged radially inside the radially outer wall.
• the annular opening has a circular shape seen from a plane perpendicular to the X axis.
• the carcass comprises two annular parts, which, in a plane including the X axis, each have an L-shaped section.
• the two annular parts of the carcass jointly define the annular cavity, in other words the hollow, in which the coil is housed.
• the detection lug is adjusted circumferentially in the recess of the carcass.
• the recess is delimited circumferentially by two end edges and the detection tab is fitted between these two edges.
• the recess may have a closed or open outline on the outside.
• the recess is a cavity communicating with the outside of the carcass.
• the recess may have the shape of a slot.
• the edge or edges axially delimiting the recess can serve as a stop to limit the axial displacement of the plunger.
• the plunger is arranged radially outside the coil.
• the coil can be smaller and less expensive.
• the annular opening is arranged radially outside the coil.
• the recess is located on the radially outer wall.
• the detection tab can extend radially.
• the recess is located on one of the first and second side walls.
• the second side wall is located, relative to the coil, on the side of the coupling device actuated by the axial displacement of the plunger, and the first side wall is located on the other side, the recess being located at least partly in the first side wall.
• the detection tab can extend axially.
• the plunger comprises a main body having the general shape of a hollow cylinder of revolution around the X axis.
• the plunger including its main body, is centered by its outer circumference on the carcass, in particular on the inner circumference of the outer cylindrical wall.
• the plunger is traversed radially by the magnetic flux.
• the detection tab may be cylindrical in shape, in particular in the form of a right circular cylinder.
• the detection tab has at its end a detection zone capable of cooperating with the sensor to provide a signal representative of the axial position of the plunger.
• This detection zone can be mounted on a plate. Thus detection is facilitated.
• the detection zone can be formed on an added part.
• the sensor can be a magnetic sensor.
• the detection zone can be formed in a magnetic sheet or a magnet.
• the tab can be made of a non-magnetic material.
• non-magnetic we mean a material which is not or hardly attracted or repelled by a magnet, for example copper, aluminium, etc.
• the electromagnetic actuation device may comprise a screen placed between the magnetic sensor and the coil.
• the screen is configured to keep the magnetic flux generated by the coil away from the sensor.
• the measurement made by the magnetic sensor is reliable and does not require corrections related to the value of the magnetic field generated by the coil.
• the screen is made of a non-magnetic material.
• the screen may be metallic.
• the screen can be carried by the detection tab.
• the electromagnetic actuation device comprises a connecting ring fixed to the plunger.
• the connecting ring is non-magnetic, for example copper or bronze.
• the connecting ring is fixed to the axial end of the plunger, on the side of the coupling device actuated by the axial displacement of the plunger.
• the connecting ring is arranged in the axial extension of the plunger towards the coupling device.
• the connecting ring and the plunger are rigidly connected to each other by one of their axial ends.
• the connecting ring is fixed to the plunger, in particular by gluing, laser welding, press fitting or by fixing pins.
• the plunger is located axially facing the coil. In other words, there is an axis parallel to the X axis passing through the plunger and the coil.
• the plunger fits completely into the radial space occupied by the coil. In other words, all axes parallel to the X axis passing through the plunger pass through the coil. Thus, this design is very compact radially.
• a thrust spring can be arranged axially between the coil and the plunger to exert a thrust force on the plunger complementary to the magnetic force generated by the coil on the plunger.
• the inner cylindrical wall is arranged around the X axis and connects a radially inner edge of the first side wall to a radially inner edge of the second side wall.
• the outer cylindrical wall is arranged around the X axis and extends axially from at least one of the radially outer edge of the first side wall and the radially outer edge of the second side wall.
• Each annular carcass part having an L-section comprises one of the first and second side walls and one of the radially inner wall and the radially outer wall.
• the invention also relates to a transmission system for a motor vehicle comprising
• an electromagnetic actuation device as described above, a first element and a second element, the second element being rotatable relative to the first element around the axis X, at least one of the first element and the second element being able to transmit a torque between an engine and a wheel of the vehicle,
• the coupling device operable by the electromagnetic actuating device;
• the coupling device comprising a first coupling part adapted to be pushed axially directly or indirectly by the plunger of the electromagnetic actuation device and a second coupling part, the first coupling part being, with respect to the first element , fixed in rotation along the X axis, and the second coupling part being, relative to the second element, fixed in rotation along the X axis;
• the first coupling part being axially movable between a coupled position in which the first coupling part is coupled with the second coupling part so as to prevent relative rotation of the first element and the second element along the X axis, and an uncoupled position in which the first coupling part and the second coupling part are uncoupled so as to allow relative rotation of the first element and of the second element along the axis X,
• a sensor cooperating with the detection tab to provide a signal representative of the axial position of the plunger so as to determine whether the first coupling part is in the uncoupled, coupled position, or an intermediate position between the uncoupled and coupled position.
• Such a transmission system may comprise one or more of the following characteristics:
• the position of the first coupling part can thus be determined by a control unit according to the signal supplied by the sensor.
• the first coupling part cannot rotate with respect to the first element with respect to the axis X.
• the coupled position makes it possible to block the relative rotation between the first element and the second element.
• the first coupling part is axially integral with the plunger.
• the measurement of the position of the plunger by the sensor makes it possible to precisely determine the position of the first coupling part.
• the first coupling part is connected to the plunger via the connecting ring.
• a pivot connection kinematically connects the plunger and the first coupling part to allow relative rotation of the plunger and the first part coupling along the X axis.
• the pivot along the X axis takes place between the connecting ring and the first coupling part.
• the connecting ring and the first coupling part each comprise a groove, the two grooves being arranged radially opposite one another. another and a retaining ring is disposed inside the two grooves.
• the ring can be mounted in this way by clipping or snap-fastening.
• the ring thus ensures axial retention of the first coupling part relative to the ring and to the plunger, which makes it possible to ensure a good evaluation of the position of the first coupling part, while allowing relative rotation between the plunger and the first coupling part along the X axis.
• the transmission system comprises return springs arranged between a support element of the transmission system which is axially fixed and one of the plunger, the connecting ring and the first coupling part, the springs return being capable of returning the first coupling part to the uncoupled position, when the coil is not supplied with current, or when the current is below a second predetermined threshold.
• the first element and the second element are arranged in the torque transmission path and the coupling device makes it possible to interrupt or authorize the transmission of the torque between the first element and the second element.
• the transmission system comprises a differential drive device, the first element comprising a housing inside which is housed the second coupling part, and the first coupling part comprising an inner portion which is housed inside the case
• the force exerted by the return springs is greater than the force exerted by said at least one thrust spring.
• the second element comprises a bearing crown which is guided in rotation around the X axis inside the case, two satellite gears which are mounted in rotation on the carrier crown around an axis Z perpendicular to the axis X, and two planetary gears which are rotatable around the axis X and which are each meshed with the two satellite gears and which are each intended to be integral in rotation with a wheel drive shaft; the second coupling part of the coupling device being integral in rotation with the carrier ring along the axis X.
• a wheel drive shaft is called a shaft which drives the wheel in rotation, upstream of the universal joint when a gimbal is present.
• the first coupling part and the second coupling part each comprise at least one complementary coupling relief to each other.
• the second coupling part can be formed directly on the bearing crown.
• the first coupling part and the carrier ring each comprise at least one coupling toothing complementary to each other.
• the coupling device may be a claw device, one of the first and second coupling parts comprising teeth and the other comprising corresponding grooves in which said teeth are engaged when the first part of coupling is in the coupled position.
• the transmission system is housed in a casing.
• This casing may comprise a non-magnetic wall, for example aluminum, and the sensor is mounted on the wall of the casing outside the casing, the sensor being capable of detecting the detection zone of the detection tab at through the crankcase wall.
• the detection zone is preferably formed by a magnet.
• stops in particular in the form of studs, are carried by the carcass and bear against the outer ring of a rolling bearing (conical for example) interposed between one of the drive shafts wheel and housing (not shown).
• a rolling bearing conical for example
• three studs are arranged at 120 degrees.
• the electromagnetic actuation device is mounted around a side sleeve of the housing which surrounds one of the wheel drive shafts.
• the carcass has an internal contour fitted around the side sleeve, allowing rotation of the side sleeve, and therefore of the housing, relative to the carcass of the electromagnetic actuation device, along the X axis.
• the end of the side sleeve is fitted inside the inner ring of the bearing.
• the carcass can be locked in rotation with respect to the X axis thanks to a retaining device arranged between the carcass and the casing.
• This retaining device can be produced by a pin cooperating in a recess or a slot in the gearbox housing.
• the transmission system also includes a reducer capable of driving the first element.
• the reducer is also arranged in the housing.
• the invention also relates to a powertrain, in particular electrified, comprising a motor, in particular electric, at least one drive wheel, and a transmission system as described previously, the transmission system being arranged to transmit a torque between the engine and said at least one driving wheel.
• the machine is suitable for regenerating electricity.
• the invention also relates to a vehicle, in particular an automobile, comprising such a powertrain.
• Figure 1 is an overall view, in perspective, of a transmission system incorporating a differential drive device and equipped with an electromagnetic actuation device according to a first embodiment .
• Figure 2 is a side view of the transmission system of Figure 1.
• Figure 3 is a sectional view of Figure 2 passing through the X axis.
• Figure 4 is a partial exploded perspective view of the electromagnetic actuation device of Figures 1 to 3, only part of the organs of the electromagnetic actuation device being shown.
• Figure 5 is a partial and schematic sectional view of the electromagnetic actuation device of Figures 1 to 4.
• Figure 6 is a partial and schematic sectional view of an electromagnetic actuation device according to a second embodiment.
• Figure 7 is a partial and schematic sectional view of an electromagnetic actuation device according to a third embodiment.
• Figure 8 is a partial and schematic sectional view of an electromagnetic actuation device according to a fourth embodiment.
• Figure 9 is a schematic view of a vehicle incorporating an electric powertrain with the transmission system of Figures 1 to 3.
• the terms “external” and “internal” as well as the “axial” and “radial” orientations will be used to designate, according to the definitions given in the description, elements of the device of electromagnetic actuation and transmission system.
• the "axial” orientation is directed along the X axis and the "radial” orientation is directed perpendicular to the X axis.
• the X axis is the reference axis of the electromagnetic actuator.
• the terms “interior” and “exterior” are to be considered in relation to the X axis.
• An “interior” element is relatively closer to the X axis than an “exterior” element.
• the "circumferential" orientation is directed orthogonal to the X axis and perpendicular to the radial direction.
• FIGS 1 to 4 illustrate a transmission system 1 incorporating an electromagnetic actuation device according to a first embodiment.
• the transmission system 10 here comprises a differential drive device which is used, in a vehicle powertrain, to transmit and distribute torque from an engine, not shown, to two wheel drive shafts 2, 3 of a vehicle axle.
• a transmission system can, for example, be part of a secondary transmission chain able to transmit torque from a secondary motor of the vehicle, such as an electric motor, to a rear or front axle of a vehicle while that a primary transmission chain is capable of transmitting torque from another motor, for example a heat engine, to the wheel drive shafts of another axle of the vehicle.
• the transmission system comprises a first element 4, movable in rotation around the axis X, and intended to be coupled, in particular via a reduction gear, to a motor, such as an electric motor, not shown, a second element 5, also rotatable around the axis X and intended to drive the wheel drive shafts 2, 3 in rotation around the axis X, and a coupling device 6 capable of selectively coupling or uncoupling the first element 4 and the second element 5.
• the first element 4 comprises a toothed wheel 7 which is intended to be coupled to the motor via a reduction gear train, not shown, and a housing 8 which is fixed integral in rotation with the toothed wheel 7
• the casing 8 comprises two parts 9a, 9b which are fixed to one another. To do this, in the embodiment shown, each of the two parts 9a, 9b comprises an external flange by which the two parts 9a, 9b are fixed to the toothed wheel 7 and to each other.
• the second element 5 comprises a carrier ring 13 of annular shape which is guided in rotation, around the axis X, inside the housing 8.
• the housing 8 comprises an internal cylindrical portion cooperating with a cylindrical outer surface of the bearing crown 13 in order to guide it in rotation relative to the housing 8.
• the second element 5 further comprises two satellite gears 14, 15, visible in FIG. 1, which are mounted in rotation on the bearing crown around an axis Z, perpendicular to the axis X.
• the two planetary gears 14, 15 each comprise a conical toothing which meshes with a complementary conical toothing of two planetary gears 16, 17.
• the two planetary gears 16, 17 are mobile in rotation around the axis X and are each integral in rotation with one of the two wheel drive shafts 2, 3.
• the carrier ring 13, the satellite gears 14, 15 and the planetary gears 16, 17 form a differential drive device allowing the two wheel drive shafts 2, 3 to rotate at different speeds.
• the transmission system 10 comprises a coupling device 6 which, in the coupled position, makes it possible to transmit a torque between the first element 4 and the carrier ring 13.
• the transmission system makes it possible, when the coupling device 6 is in the coupled position, to transmit a torque from the engine to the wheel drive shafts 2, 3 by exercising the differential function allowing different rotation speeds of the wheel drive shafts 2, 3.
• the coupling device 6 is in the uncoupled position, the transmission of torque from the engine to the wheel drive shafts 2, 3 is interrupted between the first element 4 and the bearing crown 13.
• the coupling device is configured to couple the first element 4 with one of the two planetary gears 16, 17.
• the carrier crown 13 is integral in rotation of the housing or else the two satellite gears 14, 15 are mounted in rotation around an axis Z, perpendicular to the axis X, directly on the housing 8.
• Such a coupling device then aims to prevent the two shafts wheel drive 2, 3 rotate at different speeds (differential lock).
• the coupling device 6 comprises a first coupling part 18 which is integral in rotation with the housing 8 while being axially movable along the axis X with respect to said housing 8.
• the first coupling part 18 is movable between an uncoupled position and a coupled position.
• the uncoupled position the first coupling part 18 is uncoupled from a second coupling part 19 integral in rotation with the bearing ring 13 so that the transmission of torque is interrupted between the housing 8 and the bearing ring 13.
• the first coupling part 18 is coupled to the second coupling part 19, which allows the transmission of torque between the housing 8 and the bearing ring 13.
• the coupling device 6 is a clutch device.
• one of the first and second coupling parts 18, 19 comprises teeth while the other comprises corresponding grooves in which said teeth are engaged when the first coupling part 18 is in the coupled position.
• the second coupling part 19 is formed integrally with the bearing ring 13.
• teeth or grooves are made in the side face of the bearing crown 13 which is turned facing the first coupling part 18.
• the coupling device could be of another type and in particular be a friction coupling device.
• the first coupling part 18 comprises an inner portion 20 which is housed inside the housing 8, an outer portion 21 which is positioned outside the housing 8 and connecting portions 22 which are regularly distributed around the axis X and which each pass through a corresponding through opening 23 formed in the housing 8, which makes it possible to secure the first coupling part 18 to the housing 8 while allowing relative axial movement between the first coupling part 18 and the housing 8.
• the outer portion 21 is annular while the inner portion 20 has lugs extending axially in the extension connecting portions 22.
• the structure is inverted and the outer portion 20 is annular while the inner portion 21 comprises a plurality of axially oriented lugs extending in the extension of the portions of binding 22.
• the coupling device 6 comprises an electromagnetic actuation device 100 allowing the first coupling part 18 to be moved axially.
• This actuation device is shown in section and schematically in FIG. 5.
• the electromagnetic actuation device 100 comprises a magnetic carcass 120 arranged around the axis X.
• the carcass 120 is fixed axially and circumferentially with respect to the axis X and comprises walls defining an annular cavity 150 at the inside which are housed a coil 130 and, at least in part, a plunger 110 which is able to move axially along the X axis.
• Stops 129 are carried by the carcass 120 and bear against the outer ring of a bearing 80, for example with a conical bearing, interposed between the wheel drive shaft 2 and the transmission system housing, not shown.
• a bearing 80 for example with a conical bearing
• three studs are arranged at 120 degrees.
• the carcass 120 can be locked in rotation with respect to the axis X thanks to a retaining device arranged between the carcass 120 and this casing. This retaining device can be produced by a pin cooperating in a recess or a slot in the casing.
• the casing of the transmission system can also envelop a reducer arranged to rotate the toothed wheel 7 and the differential drive device via the housing 8.
• the electromagnetic actuator 100 is mounted around a side sleeve 81 of the housing 8.
• This side sleeve 81 surrounds the wheel drive shaft 2.
• the carcass has an internal contour adjusted around the side sleeve 81 allowing the rotation of the side sleeve 81, therefore of the housing 8, relative to the carcass 120 of the electromagnetic actuation device 100, along the axis X.
• the carcass 120 is a hollow member having an axis of revolution along the X axis.
• the casing 120 comprises, in a plane passing through the X axis:
• a radially internal wall 123 arranged around the axis X and connecting an edge radially inner of the first side wall 121 to a radially inner edge of the second side wall 122,
• the second side wall 122 is located, with respect to the coil 130, on the side of the coupling device 6 controlled by the electromagnetic actuation device 10, and the first side wall 121 is located on the other side.
• the actuation device When the coil is supplied with current beyond a first predetermined threshold, the actuation device generates a magnetic flux 200.
• This flux 200 rotates around the coil section 130, according to a plane comprising the axis X, as shown in Figure 5, the magnetic flux substantially along the walls of the casing 120 and radially crossing the plunger 110.
• the carcass 120 is made at least in part from a magnetic material.
• the carcass 120 comprises an annular opening 125 arranged all around the X axis and arranged radially inside the radially outer wall 124.
• the annular opening has a circular shape seen from a plane perpendicular to the X axis.
• the carcass 120 comprises two annular parts which, in a plane including the X axis, each have an L-shaped section.
• the two annular parts of the carcass 120 jointly define the cavity 150, in other words the hollow, in which the coil 130 is housed.
• Each annular part having an L-section comprises one of the first and second side walls 121, 122 and one of the radially inner wall
• the plunger 110 is able to engage in at least a portion of the annular opening 125 when the coil 130 is supplied with current beyond a first predetermined threshold. The plunger then moves axially to close the magnetic flux 200 around the coil section, considered in a plane comprising the axis X. To do this, the plunger 110 comprises a main body of annular shape, made of ferromagnetic material, such as iron or steel, for example.
• the plunger 110 includes a shoulder 111 intended to come into abutment against the frame 120 to limit the axial displacement of the plunger 110.
• the plunger 110 is disposed radially inside the radially outer wall
• plunger 110 is arranged radially outward from coil 130.
• the main body of the plunger has the general shape of a hollow cylinder of revolution around the X axis.
• the plunger is preferably centered by its outer circumference on the carcass 120, in particular on the inner circumference of the outer wall 124 of the carcass 120.
• the displacement of the plunger makes it possible to cause the first coupling part 18 of the electromagnetic actuation device to translate axially.
• the magnetic flux makes it possible to move the plunger 110 from the retracted position to the deployed position.
• the carcass 120 exerts an attraction on the plunger 110, which makes it possible to maintain it in the deployed position by reducing the tension.
• the electromagnetic actuation device also has a detection zone 116, also called a target, which is fixed axially with respect to the plunger 110.
• the carcass 120 comprises a recess 127 and the actuating device comprises a detection tab 112 fixed to the plunger 110 and passing through this recess 127, the detection tab 112 carrying the target 116 being able to be detected by the sensor 140 .
• the transmission system comprises a sensor 140, preferably contactless, shown in Figure 1, which is positioned here axially opposite the target 116 and which is configured to deliver a signal representative of the axial distance between the target 116 and the sensor 140.
• the sensor 140 is able to deliver a signal representative of the axial position of the plunger 110, which makes it possible to determine the state of the coupling device 6, namely open or closed, or even in an intermediate position.
• the sensor 140 is here a magnetic sensor, for example Hall effect, but other types of sensors, in particular contactless, can be used.
• the electromagnetic actuation device 10 comprises a screen 160 arranged between the magnetic sensor 140 and the coil 130.
• This screen is configured to move away from the sensor 140 the magnetic flux 200 generated by the coil 130.
• This screen can be metallic. It is here mounted on the detection tab 112.
• the detection tab 112 can be cylindrical in shape, in particular in the shape of a right circular cylinder.
• the detection tab has a detection zone 116 (target) and which is able to cooperate with the sensor 140 to provide a signal representative of the axial position of the plunger 110.
• This detection zone 116 can have the shape of a plate. It is preferably located on the end zone of the detection leg 112. Preferably, the target is formed on an insert or directly on the detection leg 112. The detection zone is formed in a magnetic sheet or a magnet. Outside the detection zone, the detection tab 112 can be made of a non-magnetic material.
• the recess 127 is a cavity communicating with the outside of the carcass, that is to say open, in other words a notch or indentation.
• the recess can also have a slit shape.
• the edge or edges axially delimiting the recess 127 can serve as a stop to limit the axial displacement of the plunger.
• the dimensions of the plunger 110 and of the detection tab 112 on the one hand and of the carcass 120 and of its course on the other hand provide a slide connection along the X axis between the plunger and the carcass.
• the plunger 110 is arranged radially outside the coil 130.
• the coil can be more compact radially and therefore less costly.
• the annular opening 125 is also arranged radially outside the coil 130.
• the plunger 110 is located axially opposite the coil 130.
• This arrangement is radially compact.
• At least one thrust spring 190 is arranged axially between the coil 130 and the plunger to exert a thrust force on the plunger 110, complementary to the magnetic force generated by the coil 130 on the plunger 110.
• the recess is located on the radially outer wall 124 and the detection tab 112 extends radially.
• the recess 127 is located at least partly in the first side wall 121 .
• the paw of detection then preferably extends axially rearward to cross the first side wall 121.
• the sensor 140 is then also placed at the rear of the electromagnetic actuation device. This arrangement is very compact radially.
• the first coupling part is axially secured to the plunger.
• the measurement of the position of the plunger by the sensor makes it possible to precisely determine the position of the first coupling part 18.
• the electromagnetic actuator 10 comprises a connecting ring 115 fixed to the plunger 110.
• the connecting ring 115 and the plunger 110 are preferably rigidly connected to one another. to the other by one of their axial ends.
• the connecting ring is attached to the plunger by laser welding.
• the connecting ring 115 is non-magnetic, for example made of copper, to limit undesirable magnetic field leakage to the outside of the carcass, in particular to the first coupling part.
• the first coupling part 18 is connected to the plunger 110 via the connecting ring 115.
• the actuation force is transmitted from the plunger to the first coupling part 18 by the connecting ring 115 .
• a pivot connection kinematically connects the connecting ring 115 and the annular part of the first coupling part 18 to allow relative rotation of the plunger 110 and the first coupling part 18 along the X axis.
• the connecting ring 115 and the first coupling part 18 each comprise a groove, the two grooves being arranged radially opposite one another. from each other and a retaining ring 118 is disposed inside the two grooves.
• the ring 118 can be mounted in this way by clipping or snapping. The ring 118 thus ensures axial retention of the first coupling part 18 relative to the connecting ring 115 and to the plunger 110, which makes it possible to ensure a good assessment of the position of the first coupling part 18 , while allowing relative rotation between the plunger 110 and the first coupling part 18 along the X axis.
• one of the grooves is formed directly on the plunger 110 and the electromagnetic actuation device then has no connecting ring.
• the transmission system also comprises return springs 40 arranged between a bearing element of the casing 8 and the first coupling part 18, the springs of return being able to bring the first coupling part 18 into the uncoupled position, when the coil 130 is not supplied with current, or when the current of the coil is lower than a second predetermined threshold.
• the force exerted by the return springs 40 is greater than the force exerted by said at least one thrust spring.
• Such a transmission system is generally housed in a fixed casing, for example made of aluminium.
• the second embodiment represented in FIG. 6 differs from the other modes in that the sensor 140 is mounted on the wall of the casing 300 outside the casing.
• the sensor 140 is configured to detect the target 116 carried by the detection tab 112 through the wall of the casing, 300 which is non-magnetic, for example aluminum.
• the target 116 is preferably formed by a magnet.
• FIG. 9 very schematically shows a vehicle 1 comprising an electric powertrain driving two wheels 2002 and 2003.
• This electric powertrain comprises an electric machine 1000, a reduction gear 1100 and a transmission system 10 as described above.
• the reducer 1100 and the transmission system 10 are arranged in a common casing 300.
• the casing 1100 of the electric machine and the casing 300 can be assembled together.
• the transmission system here comprises a differential but the electromagnetic actuation device can be used with other types of transmission systems.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Retarders (AREA)
• Braking Arrangements (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=76920988

Family Applications (1)

Country Status (5)

Family Cites Families (3)

• 2021
  • 2021-06-17 FR FR2106420A patent/FR3124239B1/fr active Active
• 2022
  • 2022-06-16 EP EP22733171.7A patent/EP4356023A1/de active Pending
  • 2022-06-16 KR KR1020237042955A patent/KR20240021802A/ko unknown
  • 2022-06-16 CN CN202280042834.1A patent/CN117501032A/zh active Pending
  • 2022-06-16 WO PCT/EP2022/066513 patent/WO2022263608A1/fr active Application Filing

Also Published As

Similar Documents

Legal Events