Parking lock device

Abstract

The invention relates to a parking locking device (1) for a vehicle, comprising: a main actuator (2) of the electromagnetic type, a locking actuator (6) of the electromagnetic type, comprising a locking plunger (7) configured to, on the one hand, cooperate, in at least one locking position, with the main plunger (3) and, on the other hand, in an unlocked position, disengage from the main plunger (3), an anti-rotation device (10) configured to prevent the rotation of the main plunger (3). Figure for the abstract: Figure 1

Description

Title of the invention: Parking locking device

[0001] The present invention relates to a parking locking device, in particular for an electric vehicle.

[0002] A parking lock device for an electrically driven motor vehicle is known from patent application EP3726099. This parking lock device comprises a parking lock wheel that is rotationally fixed to a shaft in the drive train and that has multiple recesses. A locking element is provided that is movable between a closed position and an open position along a travel path and that, in the closed position, engages by complementary shape in a recess of the parking lock wheel and, in the open position, is disengaged from the recesses of the parking lock wheel.The device also includes a parking lock actuator which is actively linked to the locking element and by which the locking element can be moved between the closed and open positions along its movement path. The path of the locking element is assumed to be, for example, rectilinear.

[0003] A parking locking device of this type is intended, in the closed position, to prevent the vehicle from accidentally rolling away while parked.

[0004] The invention aims to provide a parking locking device that is simple, therefore relatively inexpensive, but just as reliable.

[0005] The invention thus relates to a parking locking device for a vehicle, in particular for a motor vehicle with electric drive, this parking locking device being capable of cooperating with a parking locking wheel which is rotationally fixed to a shaft of a drivetrain and which has alternating teeth and grooves, and this parking locking device comprising: - a main actuator of the electromagnetic type, comprising a main plunger configured to be moved in a magnetic field generated by a coil of the main actuator, the main plunger being configured to be moved, along an axis of displacement of this main plunger, between an open position in which the main plunger leaves the wheel unobstructed and a closed position in which the main plunger causes the wheel to be blocked, - an electromagnetic locking actuator, comprising a locking plunger configured to be moved in a magnetic field generated by a locking actuator coil, the locking plunger being configured to, on the one hand, cooperate, in at least one locking position, with the main plunger or an optional lever actuated by the main plunger to lock this main plunger or this optional lever, particularly in the closed position, and, on the other hand, in an unlocked position, disengage from the main plunger or this optional lever, this optional lever having a second finger configured to be moved into a recess in the wheel to lock the wheel in the closed position of the main plunger, and when the main plunger is in the open position, the lever leaves the wheel free, - an anti-rotation device configured to prevent the main plunger from rotating on itself.

[0006] The use of two electromagnetic actuators, in particular solenoids, offers the advantage of reduced cost. This is made possible by the fact that the parking lock mechanism only closes when the vehicle is stationary. The rotational stop also provides an advantage by facilitating mechanical cooperation between the actuating plunger and the locking plunger.

[0007] According to one aspect of the invention, the locking plunger is configured to cooperate, in two distinct locking positions, with the main plunger to lock it respectively in its open position and its closed position.

[0008] These two distinct locking positions include in particular a low position and a high position of the main plunger.

[0009] According to one aspect of the invention, the main plunger comprises first and second forms, in particular two grooves or two holes, spaced apart along the axis of movement of this main plunger, each form corresponding to one of the two locking positions of the locking plunger on the main plunger. The locking plunger cooperates with these forms when the locking plunger is in either of the locking positions. In particular, the locking plunger has a head configured to engage with one of these forms of the main plunger in the locking position.

[0010] According to one aspect of the invention, the anti-rotation device comprises a third form, in particular a groove, on the main plunger configured to cooperate with a fourth form of a fixed part, in particular a fixed pin, so that the main plunger can be moved by the coil of the main actuator without allowing it to rotate about itself. Thus, the anti-rotation function can be achieved by using forms between the main plunger and a fixed part belonging, for example, to a solenoid, a solenoid support housing, or a rivet added. The anti-rotation device can be configured to act as an anti-rotation device over the entire stroke or only over a part of the stroke of this main plunger, between its open position and its closed position.

[0011] According to one aspect of the invention, the anti-rotation device is configured to allow a certain flexibility of the anti-rotation on the order of a few degrees around the axis of movement of the main plunger, for example from 0.5° to 10°, which makes it possible to compensate for manufacturing defects of the different elements.

[0012] According to one aspect of the invention, the locking plunger is itself held, when the locking actuator is not electrically powered, in the locked position by an axial force along an axis of movement of this locking plunger, the axial force being generated in particular by a spring. When the main plunger is in an indeterminate position, the locking plunger, if it is not powered, can wait for the main plunger to slide towards its open or closed position before translating into the locked position.

[0013] According to one aspect of the invention, the main plunger has a first finger configured to be moved into a hollow in the wheel to lock the wheel in the closed position.

[0014] According to one aspect of the invention, the first finger is formed as an extension of the body of the main plunger, in particular from the same material as the body of the main plunger, or the main plunger is formed of several parts made of different materials, for example, with one material for the electromagnetic part and a different material for the first finger, which must in particular withstand high contact pressures. According to another aspect of the invention, the locking plunger is formed of several parts made of different materials, for example, with one material for the electromagnetic part and a different material for the head, which must in particular withstand high contact pressures.

[0015] In this embodiment, the main plunger cooperates directly with the wheel.

[0016] According to one aspect of the invention, the first finger of the main plunger has a truncated cone shape.

[0017] Alternatively, the first finger of the main plunger which is configured to engage on the wheel has an elongated shape along the axis of rotation of the wheel, this shape being in particular of the prismatic type.

[0018] In this case, the anti-rotation device is configured to keep the first elongated finger parallel to the hollow of the wheel which also has a complementary elongated shape.

[0019] This prevents the first elongated finger from turning to the right or left and becoming misaligned with the hollow of the wheel.

[0020] Such misalignment could prevent the first finger from engaging in the hollow.

[0021] Another advantage of the prismatic shape is that it allows contact between the first finger and the wheel to be established over a relatively large area. This reduces contact pressure, thus improving the mechanical strength of the assembly.

[0022] According to another aspect of the invention, the main plunger is configured to cooperate with a lever which has a second finger configured to be moved into a hollow in the wheel to lock the wheel in the closed position of the main plunger, and when the main plunger is in the open position, the lever leaves the wheel free.

[0023] In this case, the main plunger does not cooperate directly with the wheel, but the lever serves as an intermediary between the main plunger and the wheel.

[0024] One advantage of this configuration is the creation of a lever arm which, for the same displacement of the second lever finger, reduces the displacement of the main plunger. This allows for a reduction in the cost of the solenoid that actuates the main plunger.

[0025] According to one aspect of the invention, the actuating lever allows a lever arm between 0.5 and 5.

[0026] According to one aspect of the invention, the lever has an elongated shape along an axis of elongation and the lever is configured to be placed with its axis of elongation substantially orthogonal to the axis of rotation of the wheel.

[0027] According to one aspect of the invention, the lever has a pivot axis which is configured to be placed substantially parallel to the axis of rotation of the wheel.

[0028] Alternatively, the pivot axis of the lever is configured to be placed substantially orthogonally to the axis of rotation of the wheel.

[0029] According to one aspect of the invention, the lever has a pivot axis and the main plunger is configured to bear in a central bearing area of ​​the lever, between the pivot axis and the second finger of the lever. According to one aspect of the invention, the second finger is at one end of the elongated shape of the lever.

[0030] The stroke of the second finger can determine the stroke of the main plunger by positioning it along the lever (or articulated arm). Increasing the lever arm can be advantageous to reduce the stroke of the main solenoid.

[0031] Alternatively, the main plunger is configured to come to rest in an end support zone of the lever, so that the pivot axis of the lever is between this support zone and the second finger.

[0032] According to one aspect of the invention, the second finger of the lever has a frustoconical shape.

[0033] Alternatively, the second finger of the lever which is configured to engage on the wheel has an elongated shape along the axis of rotation of the wheel, this shape being in particular of the prismatic type.

[0034] In this case, the lever is advantageously configured to keep the second elongated finger of the lever parallel to the hollow of the wheel which also has a complementary elongated shape.

[0035] This prevents the second elongated finger from turning to the right or left and becoming misaligned with the hollow of the wheel.

[0036] Such misalignment could prevent the second finger from engaging in the hollow.

[0037] According to another aspect of the invention, the locking plunger is configured to cooperate, in the locking position, with the lever, in particular by complementary shapes.

[0038] According to one aspect of the invention, the main actuator and / or the locking actuator are of the normally closed type, namely that in the absence of power supply, the actuator tends to move, if it is the main actuator, the main plunger into the closed position, or, if it is the locking actuator, to move the locking plunger into the locking positions.

[0039] According to one aspect of the invention, both the main actuator and the blocking actuator are of the normally closed type.

[0040] According to one aspect of the invention, for the main actuator and / or the normally closed type locking actuator, the actuator includes a spring, in particular an axial spring, linked to the plunger which exerts a permanent mechanical force on the plunger in order to move it into the closed position / locking position.

[0041] This mechanical effort makes it possible to close the parking lock device by pushing the first or second finger into a recess in the wheel.

[0042] With a normally closed type main actuator, when at the top of a tooth, the main plunger will be between the two extreme positions, namely between the open position and the closed position, since the wheel is not locked, and the spring allows the information to be memorized and wait for the wheel to turn for the device to lock.

[0043] Thus, one can exit the vehicle after switching off the ignition, and mechanically the two springs allow the parking lock device to lock mechanically without needing an electrical supply.

[0044] This ensures controlled positions without unnecessary electrical consumption.

[0045] Alternatively, both the main actuator and the locking actuator are of the normally open type, namely that in the absence of power supply, the actuator tends to move, if it is the main actuator, the main plunger to the open position, or, if it is the locking actuator, to move the locking plunger to the unlocked position.

[0046] According to one aspect of the invention, the first or second finger capable of contacting the teeth of the wheel may have a wedge shape (or "non-disengaging" shape), allowing the wheel to retain the finger of the main plunger or lever in the closed position by friction, thus avoiding mechanical stress on the main plunger and, in particular, the locking plunger. The wedge shape is characterized by an angle α between 0 and 30°, preferably 6°. The angle α is defined between a facet of the first or second finger bearing on the teeth (in particular, a plane-on-plane contact) and the axis of movement of the main plunger.

[0047] In one embodiment, the first or second finger capable of contacting the teeth of the wheel has a wedge shape, and the wedge shape is characterized by an angle α between 2° and -15°, preferably 0°. A relatively small angle α, in particular close to 0 or less, for example between 2° and -15°, preferably 0°, will prevent the main plunger from opening under the tangential force and will allow the locking plunger to disengage under low force (only frictional forces and dynamic forces related to the inertia of the locking plunger) while protecting the locking plunger from a tangential force that could shear or damage it.

[0048] According to one aspect of the invention, the center of gravity of the lever is on the pivot axis of the lever so that the center of gravity of the lever is on a neutral line.

[0049] According to one aspect of the invention, the pivot axis is formed by a circular external contour member, and the center of gravity of the lever is positioned inside this circular external contour.

[0050] This ensures that if the lever receives a shock or acceleration, it does not begin to rotate, which is a safety feature. The center of gravity is thus controlled so that the lever cannot open on its own in the event of an accidental impact.

[0051] According to one aspect of the invention, the parking lock device is configured to prevent locking at vehicle speeds exceeding a threshold, in particular a threshold of 4 km / h. This can be managed electronically, notably by means of sensors. The sensors can be sensors of the locking device or, preferably, sensors of the vehicle (outside the locking device).

[0052] These sensors make it possible, for example, to know the speed of the vehicle and to know when it can be locked or not.

[0053] Each actuator is controlled in position by physical sensors (contactors, Hall effect sensors, etc.) or by indirect control based on physical measurements of the actuator's electromagnet (current, induction, etc.).

[0054] According to one aspect of the invention, the main actuator and the blocking actuator are controlled independently by two control electronics different for example. The control electronics can be located in a centralized electronics unit external to the parking lock device or, alternatively, be located in the parking lock device itself.

[0055] According to one aspect of the invention, the two actuators can be formed by a common module, in particular by being placed in the same housing of the common module or by being joined together to form the common module. This can facilitate transport and / or assembly operations.

[0056] The invention also relates to a system comprising: - a parking locking wheel which is rotationally fixed to a shaft of a drivetrain and which has alternating teeth and grooves, - a parking locking device as described above, the main plunger of which is to be moved between the open position in which the main plunger leaves the wheel free and a closed position in which the main plunger causes the wheel to be locked.

[0057] According to one aspect of the invention, the system is configured to be mounted in an electrically driven vehicle.

[0058] The system can be inside or outside the housing of a gearbox reducer. The system according to the invention can be sealed against gearbox oil or lubricated by this oil.

[0059] The aforementioned module can be fixed inside or outside the housing.

[0060] According to one aspect of the invention, the gearbox comprises a set of gears having an input shaft cooperating with a rotor shaft of the electric motor. The wheel of the system is rotationally linked to the input shaft.

[0061] The invention also relates to a gearbox comprising a reducer and a system such as the one mentioned above.

[0062] Other features, details and advantages of the invention will become clearer upon reading the following description on the one hand, and the illustrative and non-limiting examples of embodiments given with reference to the attached schematic drawing on the other hand, in which:

[0063] [Fig-1] Fig. 1 is a schematic representation of a system according to an example implementation of the invention;

[0064] [Fig.2] Fig.2 is a schematic representation of a system according to another example of implementation of the invention;

[0065] [Fig.3] Fig.3 is a schematic representation of a cross-sectional view of the main plunger of the system of [Fig.1] or [Fig.2], according to an example of an embodiment of the invention;

[0066] [Fig.4] Fig.4 is a schematic representation of a cross-sectional view of the main plunger of the system of [Fig.1] or of [Fig.2], according to yet another embodiment of the invention;

[0067] [Fig. 5] Fig. 5 is a schematic representation of a cross-sectional view of the main plunger of the system of [Fig.1] or of [Fig.2], according to yet another embodiment of the invention;

[0068] [Fig.6] Fig.6 is a schematic representation of a cross-sectional view of the main plunger of the system of [Fig.1] or of [Fig.2], according to yet another embodiment of the invention.

[0069] The features, variants, and different embodiments of the invention can be combined in various ways, provided they are not incompatible or mutually exclusive. In particular, variants of the invention may be conceived comprising only a selection of features, described hereafter in isolation from the other described features, if this selection of features is sufficient to confer a technical advantage and / or to differentiate the invention from the prior art.

[0070] Furthermore, ordinal numeral adjectives are used to differentiate features. They do not define the position of a feature. Therefore, for example, a third feature of a product does not mean that the product has a first and / or a second feature.

[0071] Figure 1 shows a system 100 according to an example of an embodiment of the invention, which includes a parking lock wheel 80 which is rotationally fixed to a shaft of a kinematic chain (not shown) in an electric motor-driven motor vehicle.

[0072] The parking lock wheel 80 comprises an alternation of teeth 81 and hollows 82, as shown in a simplified manner in [Fig.1] (or as shown more clearly in [Fig.2]).

[0073] The system 100 further includes a parking lock device 1 as described below.

[0074] The system 100 can be inside or outside the housing of a gearbox reducer. The system 100 according to the invention can be sealed against gearbox oil or be lubricated by this oil.

[0075] The parking lock device 1 comprises an electromagnetic main actuator 2, having a main plunger 3 configured to be moved in a magnetic field generated by a coil 4 of the main actuator 2, the main plunger 3 being configured to be moved, along a displacement axis DI of this main plunger 3, between an open position in which the main plunger 3 leaves wheel 80 clear and a closed position, illustrated in [Fig.1], in which the main plunger 3 causes wheel 80 to lock,

[0076] In said open position, the main plunger 3 is raised relative to wheel 80, and is not in contact with wheel 80.

[0077] The parking lock device 1 further includes an electromagnetic locking actuator 6, comprising a locking plunger 7 configured to be moved in a magnetic field generated by a coil 8 of the locking actuator 6, the locking plunger 7 being configured to, on the one hand, cooperate, in at least one locking position, with the main plunger 3 to lock it in particular in its closed position, and, on the other hand, in an unlocked position, disengage from the main plunger 3. The main plunger 3 and the locking plunger 7 are oriented orthogonally.

[0078] The parking lock device 1 further includes an anti-rotation device 10 configured to prevent the rotation of the main plunger 3 on itself.

[0079] In the example described, the blocking plunger 7 is configured to cooperate, in two distinct blocking positions, with the main plunger 3 to block it respectively in its open position and its closed position illustrated in [Fig.1].

[0080] These two distinct locking positions include a lower position which corresponds to the closed position and a higher position (or raised position) which corresponds to the open position of the main diver 3.

[0081] The main plunger 3 comprises a first shape 11 and a second shape 12, defined here by two grooves, spaced apart along the axis of movement D1 of this main plunger 3. In another embodiment not shown, the first and second shapes are holes.

[0082] The first form 11 corresponds to one of the two locking positions of the locking plunger 7 on the main plunger 3, namely the high position (or raised position) or the open position of the main plunger 3.

[0083] The second form 12 corresponds to the low position or closed position of the main plunger 3.

[0084] The locking plunger 7 has a head 14 configured to engage in either of these forms 11, 12 of the main plunger 3 in the locking positions.

[0085] As illustrated in [Fig.3], the anti-rotation device 10 includes a groove 16 (also designated as "third form") on the main plunger 3, here of circular cross-section, configured to cooperate with a fourth form 17 of a fixed part, here a pin, so that the main plunger 3 can be moved by the coil 4 of the main actuator 2 without allowing rotation about itself.

[0086] Alternatively, as illustrated in [Fig.4], the main plunger 3 includes a projection 27 which cooperates with a slot 28 on the fixed part.

[0087] Alternatively, as illustrated in [Fig. 5], the main plunger 3 may have a cross-section with a straight side 48 that cooperates with a rectangular shape 49 on the fixed part. In this example, the cross-section is rectangular or square. A gap between the straight side 48 and the shape 49 allows for compensation of positioning errors.

[0088] Alternatively, as illustrated in [Fig.6], the main plunger 3 may have a cross-section with a straight side 48 on a cross-section which is circular outside of the straight side 48.

[0089] The locking plunger 7 is itself held, when the locking actuator 6 is not electrically powered, in the locking position by an axial force along a displacement axis D2 of this locking plunger 7 (which is perpendicular to the displacement axis DI of the main plunger 3), the axial force being generated in particular by a second spring 18. When the main plunger 3 is in an indeterminate position, the locking plunger 7, if it is not powered, can wait for the main plunger 3 to slide towards its open or closed position before translating into the locking position.

[0090] The main plunger 3 has a first finger 19 configured to be moved into a hollow 82 of the wheel 80 to lock the wheel 80 in the closed position.

[0091] The first finger 19 is made in the extension of a body 20 of the main plunger 3.

[0092] The main plunger 3 is made up of several parts in different materials, for example with one material for the electromagnetic part and a different material for the first finger 19 which must in particular withstand high contact pressures.

[0093] Similarly, the locking plunger 7 is made up of several parts in different materials, for example with one material for the electromagnetic part and a different material for the head 14 which must in particular withstand high contact pressures.

[0094] In this embodiment of [Fig.1], the main plunger 3 cooperates directly with the wheel 80.

[0095] In the example described, the first finger 19 of the main plunger 3 has an elongated shape along the axis of rotation Xw of the wheel 80, this shape of the first finger 19 being in particular of the prismatic type.

[0096] In this case, the anti-rotation device 10 is configured to keep the first finger 19 parallel to the hollow 82 of the wheel 80 which also has a complementary elongated shape.

[0097] This prevents the first elongated finger 19 from turning to the right or left and becoming misaligned with the hollow 82 of the wheel 80.

[0098] Such misalignment could prevent the first finger 19 from engaging in the hollow 82.

[0099] In the example described, the main actuator 2 and the locking actuator 6 are of the normally closed type, namely that in the absence of power supply, the actuator tends to move, if it is the main actuator 2, the main plunger 3 into the closed position, and, if it is the locking actuator 6, to move the locking plunger 7 into the locking positions.

[0100] For the main actuator 2 and the normally closed type locking actuator 6, the main actuator 2 comprises a first spring 21, and the locking actuator 6 comprises a second spring 18, which are in particular each an axial coil spring, each spring being linked to the plunger which exerts on the respective plunger 3,7 a permanent mechanical force in order to move it into the closed position / locking position.

[0101] This mechanical effort makes it possible to close the parking lock device 1 by pushing the first finger 19 into a hollow 82 of the wheel 80.

[0102] With a normally closed main actuator 2, when at the top of a tooth 81, the main plunger 3 will be between the two extreme positions, namely between the open position and the closed position, since the wheel 80 is not locked, and the first spring 21 allows the information to be memorized and wait for the wheel 80 to turn so that the device 1 locks.

[0103] Thus, one can exit the vehicle after switching off the ignition, and the two springs 21 and 18 allow the parking lock device 1 to lock mechanically without needing an electrical supply.

[0104] This ensures controlled positions without unnecessary electrical consumption.

[0105] The first finger 19 that comes into contact with the teeth 81 of the wheel 80 may have a wedge shape (in particular a prismatic shape with a trapezoidal cross-section), allowing the first finger 19 to be ejected from the main plunger 3 when the locking plunger 7 is not in the locking position. The wedge shape is characterized by an angle α between 0 and 30°, preferably 6°. The angle α is defined between a facet of the finger bearing against the teeth 81 (in particular a plane-on-plane contact) and the axis of movement DI of the main plunger 3.

[0106] In one embodiment, a relatively small angle a, in particular close to 0 or less, between 2° and -15° for example, preferably 0°, will prevent the opening of the main plunger 3 under the tangent force T and will allow release under low force of the locking plunger 7 (only frictional forces and dynamic forces related to the inertia of the locking plunger 7) while protecting the locking plunger 7 from a tangent force which could shear or damage it.

[0107] In another embodiment of the invention illustrated in [Fig.2], the main plunger 33 is configured to cooperate with a lever 35 which has a second finger 36 to be moved in a hollow 82 of the wheel 80 to lock the wheel 80 in the closed position of the main plunger 33, and when the main plunger 33 is in the open position, the lever 35 leaves the wheel 80 free.

[0108] In this case, the main plunger 3 does not cooperate directly with the wheel 80, but the lever 35 serves as an intermediary between the main plunger 3 and the wheel 80.

[0109] The lever 35 has an elongated shape along an elongation axis XL and the lever 35 is configured to be placed with its elongation axis XL substantially orthogonal to the rotation axis Xw of the wheel 80.

[0110] The lever 35 has a pivot axis XP which is configured to be placed substantially parallel to the rotation axis Xw of the wheel 80.

[0111] The main plunger 33 is configured to bear in an end support zone 37 of the lever 35, such that the pivot axis XP of the lever 35 is between this support zone 37 and the second finger 36. The main plunger 33 can push or pull the lever in the end support zone 37 of the lever 35.

[0112] In this example of [Fig.2], the first spring 21 of the main actuator 2 is placed on one side of the main plunger 33. This first spring 21 is configured to return the main plunger 33 to the closed position.

[0113] An additional spring 40 is linked to the lever 35 in an area opposite the end support area 37, to help return the lever 35 to the closed position.

[0114] The additional spring 40 could, alternatively, be at the level of the end support area 37 and push on the underside of the lever 35.

[0115] In the example of [Fig.2], unlike the example of [Fig.1], when the main plunger 33 is in the high position, the wheel 80 is locked, and when the main plunger 33 is in the low position, the wheel 80 is unlocked.

[0116] The second finger 36 of the lever 35 which is configured to engage on the wheel 80 has an elongated shape along the axis of rotation Xw of the wheel 80, this shape being in particular of the prismatic type.

[0117] In this case, the lever 35 is advantageously configured to keep the second elongated finger 36 of the lever 35 parallel to the hollow 82 of the wheel 80 which also has a complementary elongated shape.

[0118] This prevents the second elongated finger 36 from turning to the right or left and becoming misaligned with the hollow 82 of the wheel 80.

[0119] Such misalignment could prevent the finger from engaging in the hollow 82.

[0120] The center of gravity GR of the lever 35 is on the pivot axis XP of the lever 35 so that the center of gravity GR of the lever 35 is on a neutral line NL.

[0121] This ensures that if lever 35 receives a shock or acceleration, it does not begin to rotate, which is a safety feature. This controls the positioning of the center of gravity GR so that lever 35 cannot open on its own in the event of an accidental shock or acceleration.

[0122] The parking lock device 1 is configured to prevent locking for vehicle speeds exceeding a threshold, in particular a threshold of 4 km / h. This can be managed electronically, by means of sensors. The sensors can be sensors of the locking device or, preferably, sensors of the vehicle (outside the locking device).

[0123] These sensors make it possible, for example, to know the speed of the vehicle and to know when it can be locked or not.

[0124] Each actuator 2, 6 is controlled in position by physical sensors such as contactors 39 illustrated in figures 1 and 2, which detect the end of travel of the plungers.

[0125] Alternatively, the actuators 2, 6 are controlled in position by an indirect control based on physical measurements of the actuator's electromagnet (current, induction, etc...).

[0126] For example, the main actuator 2 and the locking actuator 6 are controlled independently, for example by two different control electronics. The control electronics may be located in a centralized electronics unit external to the parking lock device 1 or, alternatively, be located in the parking lock device 1 itself.

[0127] The shaft of the kinematic chain is for example a shaft of an electric machine rotor, a shaft of a reducer or a differential.

Claims

1. Demands A parking locking device (1) for a vehicle, in particular for a motor vehicle with electric drive, said parking locking device (1) being adapted to cooperate with a parking locking wheel (80) which is rotationally fixed to a shaft of a drivetrain and which has alternating teeth (81) and grooves (82), and said parking locking device (1) comprising: - a main actuator (2) of the electromagnetic type, comprising a main plunger (3) configured to be moved in a magnetic field generated by a coil (4) of the main actuator (2), the main plunger (3) being configured to be moved, along a displacement axis (Dl) of this main plunger (3), between an open position in which the main plunger (3) leaves the wheel (80) free and a closed position in which the main plunger (3) causes the wheel (80) to be blocked, - an electromagnetic locking actuator (6), comprising a locking plunger (7) configured to be moved in a magnetic field generated by a coil (8) of the locking actuator (6), the locking plunger (7) being configured, on the one hand, to cooperate, in at least one locking position, with the main plunger (3) or an optional lever (35) actuated by the main plunger (3) to lock this main plunger (3) or this optional lever (35), particularly in the closed position, and, on the other hand, in an unlocked position, to disengage from the main plunger (3) or this optional lever (35), this optional lever (35) comprising a second finger (36) configured to be moved in a recess (82) of the wheel (80) to lock the wheel (80) in the closed position of the main plunger (3), and when the main plunger (3) is in the open position, the lever (35) leaves the wheel (80) free, - an anti-rotation device (10) configured to prevent the rotation of the main plunger (3) on itself.

2. Device according to the preceding claim, wherein the locking plunger (7) is configured to cooperate, in two distinct locking positions, with the main plunger (3) to lock it respectively in its open position and its closed position, in particular these two distinct locking positions include in particular a low position and a high position of the main plunger (3).

3. Device according to the preceding claim, wherein the main plunger (3) comprises first and second forms (11, 12), in particular two grooves or two holes, spaced apart along the axis of movement of this main plunger (3), each form corresponding to one of the two locking positions of the locking plunger (7) on the main plunger (3), and the locking plunger (7) cooperates with these forms when the locking plunger (7) is in one or the other of the locking positions.

4. Device according to any one of the preceding claims, wherein the anti-rotation device comprises a third form (16), in particular a groove, on the main plunger (3) configured to cooperate with a fourth form (17) of a fixed part, in particular a fixed pin, so that the main plunger (3) can be moved by the coil of the main actuator (2) without allowing rotation about itself.

5. Device according to any one of the preceding claims, wherein the locking plunger (7) is itself held, when the locking actuator (6) is not electrically powered, in the locking position by an axial force along an axis of displacement of this locking plunger (7), the axial force being generated in particular by a spring (18).

6. Device according to any one of the preceding claims, wherein the main plunger (3) has a first finger (19) configured to be moved into a hollow in the wheel (80) to lock the wheel (80) in the closed position.

7. Device according to the preceding claim, wherein the first finger (19) of the main plunger (3) which is configured to engage on the wheel (80) has an elongated shape along the axis of rotation of the wheel (80), this shape being in particular of the prismatic type.

8. Device according to any one of claims 1 to 5, wherein the main plunger (3) is configured to cooperate with a lever (35) which includes a second finger (36) configured to be moved into a hollow in the wheel (80) to lock the wheel (80) in the closed position of the main plunger (3), and when the main plunger (3) is in the open position, the lever (35) leaves the wheel (80) free, and in particular the lever (35) has an elongated shape along an axis of elongation (XL) and the lever (35) is configured to be placed with its axis of elongation substantially orthogonal to the axis of rotation of the wheel (80).

9. Device according to the preceding claim, wherein the lever (35) has a pivot axis (XP) and the main plunger (3) is configured to bear in an end support area (37) of the lever (35), such that the pivot axis of the lever (35) is between this support area and the second finger (36).

10. Device according to any one of claims 6 to 9, wherein the first finger (19) or the second finger (36) suitable for contacting the teeth (81) of the wheel (80) has a wedge shape and the wedge shape is characterized by an angle α between 0 and 30°, preferably 6°, the angle α being defined between a facet of the finger bearing on the teeth (81) and the axis of movement of the main plunger (3).

11. Device according to any one of claims 6 to 9, wherein the first finger (19) or the second finger (36) suitable for contacting the teeth (81) of the wheel (80) has a wedge shape and the wedge shape is characterized by an angle α between 2° and -15°, preferably being equal to 0°.

12. Device according to any one of the preceding claims, wherein the main actuator (2) and / or the locking actuator (6) are of the normally closed type, namely that in the absence of power supply, the actuator tends to move, if it is the main actuator (2), the main plunger (3) into the closed position, or, if it is the locking actuator (6), to move the locking plunger (7) into the locking positions.

13. Device according to any one of the preceding claims, wherein the two actuators (2, 6) are formed by a common module, in particular being placed in the same housing of the common module or being joined together to form the common module.

14. System (100) comprising: - a parking lock wheel (80) which is rotationally fixed to a shaft of a kinematic chain and which has an alternation of teeth (81) and hollows, - a parking lock device according to any one of the preceding claims, the main plunger (3) of which is to be moved between the open position in which the main plunger (3) leaves the wheel (80) free and a closed position in which the main plunger (3) causes the wheel (80) to lock.

15. Gearbox comprising a reducer and a system (100) according to the preceding claim.

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