JP6681322B2 - Mating type engagement device - Google Patents

Description

  The present invention relates to a meshing engagement device applied to a transmission or the like as a clutch or a brake.

For example, as an engagement device applied to a transmission or the like, a meshing engagement device also known as a so-called dog clutch or tooth clutch is known (see Patent Document 1).
In this meshing type engagement device, meshing teeth are formed on the respective facing surfaces of a pair of meshing engaging elements (simply referred to as “engaging elements”) so that the pair of engaging elements approach each other and the respective meshing teeth mesh with each other. Are engaged with each other, the pair of engaging elements are separated from each other, and the respective meshing teeth are disengaged from each other to be released.

  As such an engagement type engagement device, there is known an engagement type device which is configured to switch between engagement and disengagement between two members by controlling a current to a coil (electromagnet).

In this meshing type engagement device, for example, a return spring (release force giving member) for giving a force in a direction of releasing (releasing) mutual engagement is provided between a pair of engaging elements, and both engagement elements are provided. An electromagnetic coil and a permanent magnet are provided on the outer circumference of the element. When these engagement elements are engaged from the released state, the electromagnetic coil is energized to generate a magnetic field, and the electromagnetic force is used to approach both engagement elements against the return spring to engage them. Further, when releasing both engaging elements from the engaged state, a magnetic field is generated in the electromagnetic coil in a direction opposite to that at the time of engaging, and the opposite electromagnetic force is utilized to separate and release both engaging elements.
In addition, in addition to the fastening position where both engagement elements are completely engaged and the release position where they are completely released, this meshing type engagement device has tooth tips (tips) of meshing teeth of both engagement elements. There is a tooth tip contact position where the tooth tips are in the same position on the stroke and the tooth tips are in contact with each other or in a state in which they can contact each other.

In such a meshing type engagement device, when switching both engagement elements from the completely engaged state (fastened state) to the released state, as the two engaging elements are separated, the tooth tips of one engaging element A gap is created between the other engagement element and the root of the tooth. This air gap becomes a factor that reduces the magnetic force in the releasing direction by the electromagnetic coil (hereinafter, also referred to as releasing force).
However, on the other hand, in one engaging element that makes a stroke, a magnetic field is formed by the magnet and the coil also on the side opposite to the tooth tips, and the gap on this side becomes narrow, so as shown in FIG. , The release force temporarily decreases according to the stroke of both engagement elements toward the release side, but thereafter the release force increases.

On the other hand, the frictional force generated in both engagement elements changes as shown in FIG. That is, from the fastening position to the tooth tip contact position, the frictional force is generated by the contact between the side surfaces (hereinafter referred to as tooth side surfaces) of the meshing teeth of both engaging elements, and the contacted tooth side surfaces. This frictional force becomes even larger because the load and / or the driving force (torque) of the driving source connected to the meshing engagement device are suspended between them. However, this frictional force has a substantially constant value regardless of the stroke amount of both engaging elements.
Further, between the tooth tip contact position and the disengagement position, the frictional force between the tooth flanks disappears, and only the frictional force generated between each engaging element and the peripheral structure becomes, and as shown in FIG. It has a small frictional force.

  Therefore, when the engagement state is switched to the release state, the stroke of the engagement element toward the release side is stopped immediately before the tooth tip contact position where the frictional force between the tooth flanks is large and the release force is small. , The release state may not be obtained.

In the meshing type engagement device connected to the drive source, switching to the disengagement state is performed in most cases by reducing the driving force of the drive source to almost zero. Most of the factors of the frictional force generated at the load were due to the load torque from the load side.
Therefore, when the stroke of the engagement element is stopped as described above, the drive torque of the drive source is increased to offset the load torque applied between the tooth flanks, thereby reducing the frictional force and restarting the stroke. It is conceivable to execute the control to achieve the release state.

JP, 2016-017539, A

  However, in the control described above, it takes time to increase the drive source torque to a torque that is large enough to cancel the load torque hanging between the tooth flanks, so the release time becomes longer and a control delay occurs. There is a problem to do.

  The present invention has been devised in view of the above problems, and in the case of shifting both engagement elements from the engagement state to the release state, even if the stroke stop of the engagement element occurs due to the frictional force generated between the tooth side surfaces, An object of the present invention is to provide a meshing type engagement device that solves the above-mentioned problems by promptly canceling the stroke stop.

  (1) In order to achieve the above object, the meshing engagement device of the present invention has meshing teeth, the meshing teeth are arranged so as to be meshable with each other, and are rotatably supported by respective support members. The first and second meshing engagement elements, which are pivotally supported and one of which is connected to a drive source and the other of which is connected to a drive load, are provided on the outer circumferences of the first and second meshing engagement elements. An electromagnetic coil, a permanent magnet and a yoke, and a release force applying means for applying a release force for operating the first and second meshing engagement elements to the release side between the first and second meshing engagement elements. , Controlling the energization of the electromagnetic coil to operate the magnetic field penetrating the first and second meshing engagement elements to move the first meshing engagement element in the axial direction using magnetic force. , Between the first and second mating engagement elements for full release and full engagement A meshing type engagement device having an engagement control means for switching control and a position detection means for detecting at least the position of the complete release, wherein the engagement control means changes from the complete engagement to the complete release. At the time of switching control, after starting to supply a current for generating a magnetic force for releasing to the electromagnetic coil, at least one of a plurality of parameters indicating the control state of the both meshing engagement elements has a predetermined state. If the release position is not detected by the position detecting means even if the current becomes, the current for temporarily generating the magnetic force for engaging the electromagnetic coil is supplied, and then the current for generating the magnetic force for releasing is supplied. It is characterized in that it is configured to be supplied again.

(2) When the engagement control unit controls the switching from the complete engagement to the complete release, at the same time as starting the supply of the current for generating the magnetic force for the release to the electromagnetic coil or before the start of the current supply, It is preferably configured to reduce the load placed between the first and second mating engagement elements.
(3) It is preferable that the reduction of the load suspended between the first and second meshing engagement elements is achieved by the reduction of the drive torque of the drive source.

(4) The at least one parameter is an elapsed time after the supply of a current for generating a magnetic force for release to the electromagnetic coil is started, and the predetermined state is a state in which the elapsed time is a predetermined time or more. Is preferred.
(5) It is preferable that the at least one parameter is a drive torque of the drive source, and the predetermined state is a state in which the drive torque is equal to or less than a predetermined value.

(6) The engagement control means reduces a load suspended between the first and second meshing engagement elements before temporarily supplying a current for generating a magnetic force for engagement to the electromagnetic coil. It is preferable that it is configured as follows.
(7) It is preferable that the reduction of the load suspended between the first and second meshing engagement elements is achieved by increasing the drive torque of the drive source.

  According to the present invention, when the meshing type engagement device is controlled to switch from full engagement to full release, when at least one parameter representing the control state reaches a predetermined state, a magnetic force for engagement is generated in the electromagnetic coil. Since the current (hereinafter referred to as an engagement current) to be temporarily supplied and the current for generating a magnetic force for release (hereinafter referred to as a release current) are supplied again, the meshing engagement element is The momentary (temporary) return to full engagement, and then the movement to full disengagement again, the kinetic energy of the meshing engagement elements is added and the friction between the meshing engagement elements becomes a dynamic friction state, resulting in a stroke. The stopped state can be promptly resolved and completely released, and the control time (switching time to complete release) can be shortened.

  Further, at the same time as or before the start of the supply of the release current, the load hanging between the meshing engagement elements, that is, the frictional force is reduced, so that the meshing engagement element can be driven more reliably by switching the current. .

  Further, when the release position is not detected even when at least one parameter indicating the control state is in the predetermined state, the switching of the current is executed, so that it is not necessary to detect the actual stroke stop state, and the control mode is simple. And can have a shorter control time.

  Furthermore, by executing the control for further reducing the load (friction force) hanging between the meshing engagement elements before the start of the supply of the engagement current, the stroke stopped state can be more reliably eliminated.

FIG. 1 is a vertical cross-sectional view (upper half portion) disclosing a schematic structure of a meshing type engagement device according to an embodiment of the present invention. FIG. 6 is a longitudinal sectional view of an essential part for explaining the operation of the axial movement mechanism of the meshing engagement device according to the embodiment of the present invention, (a) showing a magnetic field state held in a completely released position, and (b) showing (b). The magnetic field state for moving from the completely released position to the completely engaged position is shown, (c) shows the magnetic field state for holding at the fully engaged position, and (d) shows the magnetic field state for moving from the completely engaged position to the completely released position. Show. It is a flow chart explaining the control means concerning one embodiment of the present invention. In the meshing type engagement device, it is a graph showing the change of the release force and the frictional force when switching both engagement elements from the fastening state to the release state, (a) is a meshing engagement element of the meshing type engagement device FIG. 6B is a graph showing a change in the release force with respect to the stroke of FIG. 4B, and FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Note that the embodiments described below are merely examples, and there is no intention to exclude various modifications and application of techniques that are not explicitly shown in the following embodiments. The configurations of the following embodiments can be variously modified and implemented without departing from the spirit thereof, and can be appropriately selected or combined as needed.

As shown in FIG. 1, an input shaft 1 connected to a drive source (not shown) (a motor in this case), and a rotation shaft (not shown) provided on the same shaft center (rotating shaft center line O ₁ ) as the input shaft 1. The element (driving load) is provided with an output gear 2 having gear teeth 2a for outputting a rotational force. The output gear 2 is rotatably arranged on the outer periphery of the input shaft 1 via bearings 3a and 3b. The main meshing engagement device (also referred to as a clutch) 10 is interposed between the input shaft 1 and the output gear 2 as described above.

  In this embodiment, the rotating element that outputs the rotational force of the output gear 2 is a part of the drive train of the vehicle. That is, in the hybrid vehicle having the engine (internal combustion engine) (not shown) and the motor (electric motor) (not shown) as drive sources, the meshing engagement device 10 is drive-coupled when the motor is used as a drive source of the vehicle, It shall be used to release the drive connection when the motor is not used as the drive source of the vehicle.

The meshing engagement device 10 includes a first armature (first meshing engagement element) 11 that rotates integrally with the input shaft 1 and a second armature (second meshing engagement element) 12 that integrally rotates with the output gear 2. And have. Each of the first and second armatures 11 and 12 is formed in a disk shape using a magnetic material, and is concentrically arranged adjacent to each other on the rotation axis O ₁ . The first armature 11 is axially movable with respect to the input shaft 1 by spline coupling or the like, and is connected so as to rotate integrally. The second armature 12 is coupled to the output gear 2 with a bolt or the like (not shown) so as to rotate integrally.

  Meshing teeth 11a and 12a that can mesh with each other are formed on the surfaces of the first and second armatures 11 and 12 that face each other (here, near the outer circumference of the facing surfaces). According to the axial position of the first armature 11, the first and second armatures 11 and 12 are in a completely released state in which the meshing teeth 11a and 12a are separated from each other and the engagement is completely released (hereinafter, simply , Also referred to as a released state), a tooth tip contact state in which the tooth tips of the meshing teeth 11a and 12a are in contact with each other, and a completely engaged state in which the meshing teeth 11a and 12a are completely meshed (hereinafter, simply , And also referred to as a fastening state).

The first armature 11 includes a complete release position (hereinafter, also simply referred to as a release position) that brings both armatures 11 and 12 into a released state, a tooth tip contact position that brings the armatures 11 and 12 into a tooth tip contact state, and the armature 11 , 12 are engaged with each other in a fully engaged position (hereinafter, also simply referred to as a engaged position) to be appropriately driven in the axial direction.
The tooth tip contact position is a state in which both tooth tips of the meshing teeth 11a and 12a are at the same position on the stroke, and when the rotation phases for engagement of the armatures 11 and 12 are the same. Since the tooth tips do not face each other, actual tooth tip contact does not occur.

  An axial movement mechanism 20 is provided to move the first armature 11 in the axial direction. The axial movement mechanism 20 urges the electromagnetic coil 21 and the permanent magnet 22 provided in the immediate vicinity of the outer peripheries of the first and second armatures 11 and 12, and the first armature 11 in a direction separating from the second armature 12. And a spring 23 (release force applying means) for applying a release force for releasing the first and second armatures 11 and 12 to each other between the armatures 11 and 12.

  A yoke 24 made of a magnetic material is provided around the electromagnetic coil 21 and the permanent magnet 22. The yoke 24 is supported by the support member 25 together with the electromagnetic coil 21 and the permanent magnet 22, and is provided on the outer circumference of the first and second armatures 11 and 12.

The support member 25 is made of a magnetic material, and is rotatably supported on the outer circumference of the input shaft 1 via bearings 4a and 4b, and has a cylindrical base portion 25a extending along the axis O _{1 of the} rotary shaft. square has a flange portion 25b which extends in the (radial direction), and a cylindrical yoke support portion 25c extending along the outer edge of the flange portion 25b in the rotation axial line O _1.

The yoke 24 includes a first yoke 24a and a second yoke 24b that are provided so as to be separated in the axial direction (direction of the rotation axis O ₁ ) so as to sandwich the electromagnetic coil 21, and the first yoke 24a and the second yoke 24a. The inside of the facing portion of 24b extends so as to partially surround the electromagnetic coil 21 from the inner peripheral side. The permanent magnet 22 is arranged between the second yoke 24b and the yoke support portion 25c on the outer side. Thereby, the yoke 24 and the support member 25 are used to form a magnetic field penetrating the first and second armatures 11 and 12.

  This magnetic field is formed according to the positions of the armatures 11 and 12 and the energization state of the coil 21. For example, as shown in FIG. 2A, when the electromagnetic coil 21 is not energized in the released state where the tooth tips of the meshing teeth 11a and 12a of the armatures 11 and 12 are separated from each other, magnetic flux lines (black arrows) generated by the permanent magnets 22 are generated. It is formed. In response to the magnetic flux lines, the first armature 11 is magnetically attracted to the flange-shaped portion 25b of the support member 25, and the released state is maintained.

  Here, when a fastening current is passed through the electromagnetic coil 21 to form a magnetic flux line indicated by a two-dot chain line arrow in FIG. 2A, the magnetic flux lines formed by the electromagnetic coil 21 cause the armatures 11 and 12 to be separated from each other. The approaching magnetic force overcomes the releasing force of the spring 23 and the magnetic force corresponding to the magnetic flux lines of the permanent magnet 22, and the tooth tips of the meshing teeth 11a and 12a of the armatures 11 and 12 are magnetically attracted to release the armature 11. Driven from position to the side of the fastening position.

  During this process, when the armature 11 moves from the release position to the tooth tip contact position, the magnetic flux lines indicated by black arrows in FIG. 2A disappear due to the separation between the armature 11 and the flange-shaped portion 25b, and FIG. As indicated by a black arrow A3, magnetic flux lines surrounding the electromagnetic coil 21 by the permanent magnet 22 are formed in the illustrated direction (opposite to the release position), and the magnetic force by the permanent magnet 22 causes the armatures 11 and 12 to come into contact with each other. It will work closer to you. That is, both the magnetic force generated by the magnetic flux lines formed by the coil 21 (see white arrow A4) and the magnetic force generated by the magnetic flux lines formed by the permanent magnet 22 (see black arrow A3) drive the armatures 11 and 12 to the fastening position. Acting as an engaging force.

  Then, when the armature 11 is at the tip contact position and the relative phase of the armatures 11 and 12 is adjusted to a position where the meshing teeth 11a and 12a mesh with each other, the armature 11 receives the releasing force of the spring 23 due to the above-mentioned engaging force. It overcomes and is driven to the fastening position.

  At this fastening position, even if the energization of the electromagnetic coil 21 is stopped, the magnetic force that brings the armatures 11 and 12 closer to each other by the permanent magnet 22 releases the spring 23, as shown by the black arrow A5 in FIG. The armature 11 is held in the fastening position by overcoming the force. Therefore, the armatures 11 and 12 can be held in a fastened state without energizing the electromagnetic coil 21.

  On the other hand, in order to drive the first armature 11 at the engagement position to the release side, the electromagnetic coil 21 is supplied with a release current in a direction opposite to the engagement current, and as shown in FIG. (See white arrow A6) is formed to generate a magnetic force (see a magnetic flux line indicated by a black arrow A7) as a releasing force of the armatures 11 and 12. The magnetic force (release force) that separates the armatures 11 and 12 formed by the electromagnetic coil 21 cooperates with the release force of the spring 23 to overcome the magnetic force (engagement force) of the permanent magnet 22, and the armatures 11 and 12 are released. , The first armature 11 is driven from the fastening position toward the release position.

  By the way, this device is equipped with a control device 30. The control unit 30 includes a position determination unit (position detection unit) 31 that determines the position of the first armature 11 (the relative position between the armatures 11 and 12), and a main control unit that controls the entire drive mechanism of the hybrid vehicle (see FIG. Based on the control signal from the (not shown) and the determination result of the position determination unit 31, the energization of the electromagnetic coil 21 is controlled to switch the first and second armatures 11 and 12 between release and fastening. In addition, an engagement control section (engagement control means) 32 that issues a current control signal to the motor control device 50 is provided. A computer including a memory (ROM, RAM) and a CPU is applied to the control device 30.

The position determination unit 31 determines the position of the first armature 11 based on the detection information of the position sensor 41.
The position sensor 41 detects the amount of movement of the follower 41a configured such that the tip end thereof always contacts the side surface of the first armature 11 by a biasing means such as a spring (not shown) arranged in the body of the position sensor 41. , A conventionally well-known stroke sensor for detecting the position of the first armature 11. The tip end of the follower 41a is in contact with the first armature 11 via a thrust bearing or the like (not shown).

  In the present invention, since it is only necessary to detect the release position of the first armature 11, instead of the stroke sensor, a switch type switch that is turned on and off when the first armature 11 is in the release position is used. A position sensor may be used.

In the present embodiment, the first armature 11 is switched from the fastening position to the release position when the vehicle is switched from single motor drive or hybrid drive using a motor as a drive source to single engine drive using only the engine as a drive source. Is.
When the switching of the vehicle traveling mode is detected, the engagement control section 32 in which the program based on the flowchart shown in FIG. 3 is incorporated switches the first armature 11 from the fastening position to the releasing position.

  In order to switch the first armature 11 from the engagement position to the release position, first, in step S01, control for reducing the motor torque to zero is executed. It should be noted that the current value at which the motor torque is zero is such that the rotation speed of the motor is synchronized with the rotation speed of the output gear 2, but the current value at which the output torque is zero, that is, the rotor of the motor is rotated at the synchronous rotation speed. It is a current value that can rotate at.

  Next, in step S02, the release current is input to the electromagnetic coil 21 (starting supply) and the timer is started.

  Then, in step S03, it is determined whether or not the elapsed time T (parameter indicating the control state) from the input of the release current has exceeded the predetermined time M. The predetermined time M is a time in consideration of the rise time of the release current and the time required for the first armature 11 to smoothly move to the release position without stopping the stroke by the input of the release current.

As the determination in step S03, instead of determining the elapsed time T, it may be possible to use a determination as to whether or not the motor torque that started to be reduced in step S01 is equal to or less than a predetermined torque or becomes substantially zero. However, since it takes a little longer time to reduce the motor torque, it is possible to shorten the entire control time by setting the predetermined time M shorter than the motor torque reduction time.
When the motor torque reduction is used for the determination in step S03, the timer T need not be started or stopped.

If the determination in step S03 is NO, the process returns to step S02 and the steps S02 and S03 are repeatedly executed until the determination in step S03 becomes YES.
When the determination in step S03 is YES, the process proceeds to step S04 to stop the timer, and further proceeds to step S05 to determine whether the release position of the first armature 11 is detected.

  If the determination in step S05 is YES, it means that the movement of the first armature 11 to the disengagement position has been completed and the disengagement of the clutch has been completed, so the disengagement current is turned off (blocked) in step S06, and step S07 is executed. To stop the motor and end the control.

On the other hand, if the determination in step S05 is NO, it can be determined that the first armature 11 has not reached the release position and the stroke has stopped. Therefore, in step S08, the motor torque is set to the drive side (direction to drive the drive load). And the increase amount N of the motor torque is determined to be equal to or greater than a predetermined value K in step S09.
The predetermined value K is a value of about a fraction (for example, 1/4) of the load (friction force) suspended between the tooth flanks of the meshing teeth 11a and 12a in the stroke stopped state.

The increase of the motor torque in step S08 is a control for reducing the load (friction force) suspended between the tooth flanks of the meshing teeth 11a and 12a in the stroke stopped state.
That is, as described in paragraph 0040, the first armature 11 is switched from the fastening position to the release position by changing the vehicle from a single motor drive using a motor as a drive source or a hybrid drive to an engine using only an engine as a drive source. In this case, the load (friction force) hanging between the tooth flanks is due to the driven torque from the wheel (driving load) side, since this is the case of switching to single-unit traveling. Therefore, in order to offset this driven torque and reduce the load (friction force) hanging between the tooth flanks, it is necessary to increase the motor torque to the drive side.

When the determination in step S09 is NO, the process returns to step S05 and it is determined whether the first armature 11 is in the release position.
This is because the stroke of the first armature 11 is restarted even if the increase amount N of the motor torque does not reach the predetermined value K (even if the reduction amount of the load hanging between the tooth flanks is small). This is a control that considers the possibility of

On the other hand, the determination in step S09 becomes YES when the stroke stop is not resolved even when the motor torque increase amount N becomes equal to or greater than the predetermined value K, and the release current is temporarily (for a moment, for example, It is switched to the fastening current for 0.1 second) and supplied to the electromagnetic coil 21, and then the process returns to step S02 to input (re-supply) the release current. As a result, the first armature 11 once moves to the fastening position and then moves toward the release position again.
Then, thereafter, steps S02 to S05 and steps S08 to S10 are repeatedly executed until the determination in step S05 becomes YES.

  However, the first armature 11 switches from the static friction state of the stroke stop to the dynamic friction state of the movement to the engagement position and the re-movement to the release position by the engagement current input in step S10. Unless a situation in which a large load such as the above occurs occurs, it is highly possible that the release position is achieved by executing the control of steps S08 to S10 once.

  The meshing engagement device according to the embodiment of the present invention is configured as described above, and when the meshing engagement device 10 is controlled to be switched from the complete engagement to the complete release, the If the release position of the first armature 11 is not detected when the elapsed time T becomes the predetermined time M or more, the engagement current is temporarily supplied, and then the release current is re-supplied. Therefore, the first armature 11 instantaneously (temporarily) returns to the engagement position, and then moves to the release position again, so that the kinetic energy of the first armature 11 is added and between the tooth flanks in contact with each other. The generated friction becomes a dynamic friction state, and the stroke stopped state can be promptly resolved to be completely released, and the control time (switching time to complete release) can be shortened.

  Further, before the start of the supply of the release current in step S02, the load applied between the first and second armatures 11 and 12, that is, the frictional force applied between the tooth flanks is reduced, so that the release current and the engagement current are switched. The driving of the first armature 11 by means of can be performed more reliably.

  Further, since the current switching is executed when the release position of the first armature 11 is not detected even when the elapsed time T becomes the predetermined time M or more, the actual stroke stop state of the first armature 11 is detected. There is no need, and the control mode can be simplified and the control time can be shortened.

  Furthermore, by executing control to increase the motor torque in the driving direction and further reduce the load (friction force) suspended between the first and second armatures 11 and 12 before starting the supply of the engagement current, the stroke is reduced. The stopped state can be more reliably resolved.

Although the embodiment of the present invention has been described above, the present invention can be implemented by appropriately modifying the embodiment.
For example, in the above-described embodiment, the control for setting the motor torque to zero is configured to be started in step S01 prior to the supply of the release current in step S02, but the motor torque reduction control and the release current input are simultaneously started. It may be configured to do so.

  Further, in the above-described embodiment, the control for increasing the motor torque to further reduce the load hanging on the tooth side surface is executed before the engagement current is input, but the meshing engagement in which the transmission torque does not become so large is performed. When the present invention is applied to the device, it is possible to omit the increase control of the motor torque.

  Further, the axial movement mechanism 20 is equipped with an electromagnetic coil, a permanent magnet, and a yoke, and controls the energization to the electromagnetic coil to operate the magnetic field to move the first armature 11 in the axial direction. Well, it is not limited to the structure of this embodiment.

  Further, in the present embodiment, the main meshing engagement device is applied to a portion where the motor is connected or not connected to the drive train of the hybrid vehicle, but the main meshing engagement device is applicable without being limited thereto. .

1 input shaft 2 output gear 10 meshing type engagement device (clutch)
11 First armature (first mating engagement element)
11a Interlocking teeth of the first armature 11 12 Second armature (second interlocking engagement element)
12a Meshing teeth of the second armature 12 21 Electromagnetic coil 22 Permanent magnet 23 Spring (release force applying means)
30 control device 31 position determination unit (position determination means)
32 Engagement control section (engagement control means)
41 Position sensor

Claims (7)

Each has meshing teeth, and the meshing teeth are arranged to face each other so as to be meshable with each other, and each is rotatably supported by a supporting member, and one of them is connected to a drive source and the other is connected to a drive load. First and second mating engagement elements,
An electromagnetic coil, a permanent magnet and a yoke provided on the outer periphery of the first and second meshing engagement elements,
Release force applying means for applying a release force for operating the first and second meshing engagement elements to the release side between the first and second meshing engagement elements,
By controlling energization to the electromagnetic coil and operating a magnetic field penetrating the first and second meshing engagement elements, the first meshing engagement element is moved in the axial direction using magnetic force, Engagement control means for switching control of the first and second meshing engagement elements between complete release and complete engagement;
A position detecting means for detecting at least the position of complete release, and a meshing engagement device comprising:
When the engagement control means controls the switching from the complete engagement to the complete release, after starting the supply of the current for generating the magnetic force for the release to the electromagnetic coil, the control state of the both meshing engagement elements is changed. If the position detecting means does not detect the release position even if the state of at least one of the plurality of parameters is in the predetermined state, the current for temporarily generating the magnetic force for engaging the electromagnetic coil is temporarily set. Mechanically engaging device, characterized in that it is adapted to be re-supplied with an electric current which supplies a magnetic force for subsequent release. When the engagement control means controls the switching from the complete engagement to the complete release, at the same time as starting the supply of the current for generating the magnetic force for the release to the electromagnetic coil or before the start of the current supply, The meshing engagement device according to claim 1, wherein the meshing engagement device is configured to reduce a load that is applied between the second meshing engagement elements. 3. The meshing engagement device according to claim 2, wherein the reduction of the load suspended between the first and second meshing engagement elements is achieved by reducing the driving torque of the drive source. The at least one parameter is an elapsed time after the supply of a current for generating a magnetic force for release to the electromagnetic coil is started, and the predetermined state is a state in which the elapsed time is a predetermined time or more. The meshing type engagement device according to any one of claims 1 to 3, characterized in that. 4. The at least one parameter is a drive torque of the drive source, and the predetermined state is a state in which the drive torque is equal to or less than a predetermined value. The meshing type engagement device according to 1. The engagement control means is configured to reduce a load suspended between the first and second meshing engagement elements before temporarily supplying a current for generating a magnetic force for engagement to the electromagnetic coil. The meshing type engagement device according to any one of claims 1 to 5, wherein the engagement type engagement device is provided. 7. The meshing engagement device according to claim 6, wherein the reduction of the load suspended between the first and second meshing engagement elements is achieved by increasing the driving torque of the drive source.

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