Interlocking engagement device

Abstract

To provide a meshing type engagement device that can be suppressed in size and cost while comprising a slide member which slides axially to move.SOLUTION: Denoting one of a first position P1 and a second position P2 corresponding to engagement states of an engagement element 1 as an object position Pa and the other as a non-object position Pb, and a driving quantity of a drive source 3 corresponding to a movement of a slide member 11 from the object position Pa to an end part on the side of an axial object side Lt within a convergence range in which converging force of a detent mechanism 5 is generated as a specific driving quantity, a control device sets, when the slide member 11 at a stop of a drive device 2 stored in a storage part is at the object position P1 in actuation of the drive device 2, driving force of the drive source 3 below the converging force of the detent mechanism 5 after driving the drive source 3 by a set driving quantity set below the specific driving quantity so that the slide member 11 moves toward the axial object side Lt from the non-object position Pb to the object position Pa in an axial direction L.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a meshing engagement device including a meshing engagement element and a drive device that drives the engagement element. [Background technology]

[0002] An example of such an interlocking engagement device is disclosed in the following Patent Document 1. In the following explanations of the "Background Art" and "Problems to be Solved by the Invention", the reference symbols in Patent Document 1 will be cited in parentheses.

[0003] The meshing type engagement device (1) of Patent Document 1 includes an engagement element (2) having a slide member (2a) that slides in the axial direction, and a drive device that drives the engagement element. The drive device includes a drive source (8), transmission mechanisms (6, 7) that transmit the drive force of the drive source to the slide member (2a), and a detent mechanism (11) that holds the axial position of the slide member (2a). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-64469 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the meshing engagement device (1) of Patent Document 1, a detection device (10) is provided to detect the axial position of the slide member (2a) in order to move the slide member (2a) to a desired position. However, the installation of the detection device (10) has led to an increase in size and cost of the meshing engagement device (1).

[0006] Therefore, it is desirable to realize an interlocking type engagement device that can keep size and costs small in a configuration that includes a slide member that slides in the axial direction. [Means for solving the problem]

[0007] In view of the above, the characteristic configuration of the meshing engagement device is as follows: A meshing engagement device comprising a meshing engagement element and a drive device for driving the engagement element, The engagement element includes a slide member that slides in a specified axial direction, and is configured to transition between a first engagement state and a second engagement state by the sliding movement of the slide member; the drive device includes a drive source, a transmission mechanism that transmits a drive force of the drive source to the slide member, a detent mechanism that maintains a slide position that is a position of the slide member in the axial direction, and a control device that controls the drive source; the detent mechanism generates a convergence force that causes the slide position to converge to a first position corresponding to the first engagement state and a second position corresponding to the second engagement state, One of the first position and the second position is a target position, and the other is a non-target position; A side from the asymmetric position toward the symmetric position in the axial direction is defined as an axially symmetric side, a drive direction of the drive source that slides the slide member in the axial symmetrical direction is defined as a symmetric drive direction; a convergence range is a range in which the convergence force of the detent mechanism that converges the slide position to the target position occurs; a drive amount of the drive source corresponding to moving the slide member from the target position to an end portion on the axial target side in the convergence range is defined as a specific drive amount, The control device includes a memory unit which stores the slide position when the drive device is stopped, and when the drive device is started, if the slide position stored in the memory unit is the target position, the control device drives the drive source in the target drive direction by a set drive amount which is set less than the specific drive amount, and then executes a first startup control which sets the drive force of the drive source to less than the convergence force.

[0008] According to this characteristic configuration, even if the slide position becomes uncertain due to backlash of the transmission mechanism when the drive device is started, if the slide position at the time of the previous stop was the target position, the slide member is moved axially within the convergence range, and then the driving force of the drive source is reduced, so that the slide position can be converged to the target position by the convergence force of the detent mechanism. This makes it possible to accurately position the slide member at the target position after closing the gap caused by backlash of the transmission mechanism in the target drive direction. Therefore, the drive control of the slide member can be accurately performed without installing a detection device that directly detects the slide position. As a result, since the installation of a detection device can be avoided, the size and cost of the meshing engagement device can be reduced in a configuration including a slide member that slides in the axial direction. According to this characteristic configuration, the drive amount of the drive source in the first startup control is limited to a set drive amount that is set to be less than the specific drive amount. This makes it possible to shorten the drive time of the drive source for the first startup control. Therefore, it is possible to quickly start control of the engagement element after the startup of the drive device. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a skeleton diagram of a vehicle drive device including a meshing engagement device according to an embodiment; [Diagram 2] FIG. 1 is a diagram showing an interlocking engagement device according to an embodiment; [Diagram 3] FIG. 1 is a diagram showing a detent member of an interlocking engagement device according to an embodiment; [Figure 4] FIG. 2 is a block diagram showing a drive device for the meshing engagement device according to the embodiment; [Diagram 5] FIG. 13 is a diagram illustrating a state in which the sliding member is restricted by the restricting portion from moving toward the axial symmetric side from the restricted position. [Figure 6] 1 is a flowchart showing an example of a control process performed by a control device. [Figure 7] Flowchart showing an example of a first startup control [Figure 8]Flowchart showing an example of second startup control [Figure 9] A time chart showing an example of the first startup control DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a meshing engagement device 10 according to an embodiment will be described with reference to the drawings. As shown in FIG.

[0011] The vehicle drive device 100 includes a rotating electric machine MG including a stator ST and a rotor RT, an input member I, a transmission TM, a counter gear mechanism CG, and a differential gear mechanism DF.

[0012] The rotating electric machine MG is disposed on a first axis X1. The first axis X1 is the rotation axis of the rotor RT. In this embodiment, the meshing engagement device 10, the input member I, and the planetary gear mechanism PG are also disposed on the first axis X1. The counter gear mechanism CG is disposed on a second axis X2 different from the first axis X1. Moreover, the differential gear mechanism DF is disposed on a third axis X3 different from the first axis X1 and the second axis X2. In this example, the above-mentioned axes X1 to X3 are disposed parallel to one another.

[0013] In the following description, a direction parallel to the above-mentioned axes X1 to X3 is referred to as the "axial direction L" of the vehicle drive device 100. One side of the axial direction L is referred to as the "first axial side L1", and the other side of the axial direction L is referred to as the "second axial side L2". In this embodiment, in the axial direction L, the side where the input member I is arranged with respect to the rotating electric machine MG is referred to as the first axial side L1, and the opposite side is referred to as the second axial side L2. In addition, a direction perpendicular to each of the above-mentioned axes X1 to X3 is referred to as the "radial direction R" based on each axis. Note that when it is not necessary to distinguish which axis is used as the reference or when it is clear which axis is used as the reference, it may be simply referred to as the "radial direction R".

[0014] The rotating electric machine MG functions as a driving force source for the wheels W. The rotating electric machine MG has a function as a motor (electric motor) that receives a supply of electric power to generate power, and a function as a generator (electric power generator) that receives a supply of power to generate electric power. Specifically, the rotating electric machine MG is electrically connected to an electric storage device (not shown) such as a battery or a capacitor. The rotating electric machine MG generates driving force by running using the electric power stored in the electric storage device. The rotating electric machine MG also generates power using the driving force transmitted from the wheels W to charge the electric storage device.

[0015] A stator ST of the rotating electric machine MG is fixed to a non-rotating member (for example, a case that accommodates the rotating electric machine MG, etc.). A rotor RT of the rotating electric machine MG is supported rotatably relative to the stator ST. In this embodiment, the rotor RT is disposed on the inside in the radial direction R relative to the stator ST.

[0016] The input member I is drivingly connected to the rotor RT. In this application, the term "drivingly connected" refers to a state in which two rotating elements are connected to be able to transmit a driving force, and includes a state in which the two rotating elements are connected to rotate integrally, or a state in which the two rotating elements are connected to be able to transmit a driving force via one or more transmission members. Such transmission members include various members that transmit rotation at the same speed or at a variable speed, such as a shaft, a gear mechanism, a belt, a chain, etc. Note that the transmission members may also include an engagement device that selectively transmits rotation and driving force, such as a friction engagement device, a meshing engagement device, etc.

[0017] The transmission TM is configured to be able to selectively establish a plurality of gear stages. The transmission TM changes the rotation transmitted from the input member I at a gear ratio corresponding to the established gear stage among the plurality of gear stages and transmits the rotation to the wheel W (here, the counter gear mechanism CG). The transmission TM includes a planetary gear mechanism PG and the meshing engagement device 10 described above.

[0018] The planetary gear mechanism PG includes a ring gear Rg, a carrier Cr, and a sun gear Sn. The ring gear Rg is connected to the input member I so as to rotate integrally with the input member I. The sun gear Sn is disposed on the inside of the ring gear Rg in the radial direction R. The carrier Cr rotatably supports a plurality of pinion gears Pn that mesh with both the ring gear Rg and the sun gear Sn.

[0019] The meshing engagement device 10 includes a meshing engagement element 1. The engagement element 1 includes a slide member 11 that slides in a specified axial direction. In this embodiment, the "axial direction" which is the sliding direction of the slide member 11 coincides with the axial direction L.

[0020] The engaging element 1 is configured to transition between a first engaging state and a second engaging state by the sliding movement of the slide member 11. Therefore, the slide member 11 is configured to be slidable between a first position P1 corresponding to the first engaging state and a second position P2 corresponding to the second engaging state. In this embodiment, the engaging element 1 transitions to a third engaging state in addition to the first engaging state and the second engaging state. Therefore, in this embodiment, the slide member 11 slides between the first position P1, the second position P2, and the third position P3 corresponding to the third engaging state. In this embodiment, these positions P1, P2, and P3 are arranged in the order of the first position P1, the third position P3, and the second position P2 from the first axial side L1 toward the second axial side L2.

[0021] In this embodiment, the engaging element 1 further includes a support member 12, a first engaging portion 13, and a second engaging portion .

[0022] The support member 12 supports the slide member 11 so as to be slidable in the axial direction L. The support member 12 is connected to the sun gear Sn of the planetary gear mechanism PG via a first shaft member S1 so as to rotate integrally with the sun gear Sn. The first shaft member S1 is formed so as to extend along the axial direction L. The first shaft member S1 is disposed on a first axis X1.

[0023] The first engagement portion 13 is disposed adjacent to the support member 12 on a first axial side L1. The first engagement portion 13 is fixed to a non-rotating member. In this embodiment, the first engagement portion 13 is fixed to a first wall portion C1 provided in a case that houses a rotating electric machine MG and the like. The first wall portion C1 is formed to extend along the radial direction R.

[0024] The second engagement portion 14 is disposed adjacent to the support member 12 on the second axial side L2. The second engagement portion 14 is connected to the carrier Cr of the planetary gear mechanism PG via the second shaft member S2 so as to rotate integrally with the carrier Cr. The second shaft member S2 is formed in a cylindrical shape with the first axis X1 as its axis. The second shaft member S2 is disposed on the outer side in the radial direction R with respect to the first shaft member S1. The second shaft member S2 is also connected to the first gear G1 so as to rotate integrally with the carrier Cr. The first gear G1 is disposed on the outer side in the radial direction R with respect to the second shaft member S2. The first gear G1 is disposed on the first axis X1.

[0025] The slide member 11 is configured to selectively engage with either the first engagement portion 13 or the second engagement portion 14. When the slide member 11 is located at the first position P1, the slide member 11 is engaged with the first engagement portion 13. As a result, the sun gear Sn is fixed to a non-rotating member (here, the first wall portion C1) via the support member 12 that supports the slide member 11 and the first shaft member S1 connected to the support member 12. In this state, the rotation input from the input member I to the planetary gear mechanism PG is reduced in speed and transmitted to the first gear G1. That is, in this state, a low gear stage that is a gear stage with a relatively large gear ratio is formed in the transmission TM. Thus, in this embodiment, the first engagement state, which is the state of the engagement element 1 when the slide member 11 is located at the first position P1, corresponds to a state in which a low gear stage is formed in the transmission TM.

[0026] On the other hand, when the slide member 11 is located at the second position P2, the slide member 11 is engaged with the second engagement portion 14. As a result, the support member 12 supporting the slide member 11 and the second engagement portion 14 are connected to rotate integrally. Therefore, the sun gear Sn connected to the support member 12 via the first shaft member S1 and the carrier Cr connected to the second engagement portion 14 via the second shaft member S2 rotate integrally. In this state, the rotation input from the input member I to the planetary gear mechanism PG is transmitted as it is to the first gear G1. That is, in this state, a high speed gear with a relatively small gear ratio is formed in the transmission TM. Thus, in this embodiment, the second engagement state, which is the state of the engagement element 1 when the slide member 11 is located at the second position P2, corresponds to a state in which a high speed gear is formed in the transmission TM.

[0027] Furthermore, when the slide member 11 is located at the third position P3, the slide member 11 is not engaged with either the first engagement portion 13 or the second engagement portion 14. In this state, no power is transmitted between the planetary gear mechanism PG and the differential gear mechanism DF, and the driving force of the rotating electric machine MG is not transmitted to the pair of wheels W. That is, in this state, the transmission TM is in a neutral state in which no gear stage is formed. Thus, in this embodiment, the third engagement state, which is the state of the engagement element 1 when the slide member 11 is located at the third position P3, corresponds to a neutral state in which no gear stage is formed in the transmission TM.

[0028] In this embodiment, the slide member 11 is formed in a cylindrical shape with the first axis X1 as its axis. Internal teeth are formed on the inner peripheral portion of the slide member 11, and external teeth corresponding to the internal teeth are formed on the support member 12. These internal teeth and external teeth are engaged with each other so as to be movable relative to each other in the axial direction L and not rotatable relative to each other in the circumferential direction. In this way, the slide member 11 rotates integrally with the support member 12 and is supported so as to slide relative to the support member 12 in the axial direction L. That is, in this embodiment, the slide member 11 is a sleeve of a dog clutch.

[0029] In this embodiment, the first engagement portion 13 is formed in a cylindrical shape with the first axis X1 as its axis. The outer periphery of the first engagement portion 13 is formed with external teeth that are movable relative to the internal teeth of the slide member 11 in the axial direction L and engage with the internal teeth in the circumferential direction so as not to rotate relative thereto. The second engagement portion 14 is formed in a cylindrical shape with the first axis X1 as its axis. The outer periphery of the second engagement portion 14 is formed with external teeth that are movable relative to the internal teeth of the slide member 11 in the axial direction L and engage with the internal teeth in the circumferential direction so as not to rotate relative thereto. Thus, when the slide member 11 is positioned at the first position P1, the slide member 11 engages with the first engagement portion 13, and when the slide member 11 is positioned at the second position P2, the slide member 11 engages with the second engagement portion 14. When the slide member 11 is positioned at the third position P3, the slide member 11 does not engage with either the first engagement portion 13 or the second engagement portion 14.

[0030] The counter gear mechanism CG includes a second gear G2 that meshes with the first gear G1, and a third gear G3 that rotates integrally with the second gear G2. In this embodiment, the third gear G3 is formed to have a smaller diameter than the second gear G2. The third gear G3 is disposed on the second axial side L2 of the second gear G2.

[0031] The differential gear mechanism DF is configured to distribute the rotation transmitted from the rotating electric machine MG to a pair of wheels W. In this embodiment, the differential gear mechanism DF includes a fourth gear G4 that meshes with the third gear G3. Therefore, in this embodiment, the differential gear mechanism DF distributes the rotation of the fourth gear G4 to the pair of wheels W.

[0032] 2, the meshing engagement device 10 includes a drive device 2 that drives the engagement element 1. The drive device 2 includes a drive source 3, a transmission mechanism 4, and a detent mechanism 5.

[0033] The driving source 3 drives the sliding member 11 to slide in the axial direction L via the transmission mechanism 4. In this embodiment, the driving source 3 includes a driving shaft 31 that rotates about an axis along the axial direction L.

[0034] The transmission mechanism 4 is a mechanism that transmits the driving force of the driving source 3 to the slide member 11. In this embodiment, the transmission mechanism 4 includes a conversion mechanism 41 and a coupling mechanism .

[0035] The conversion mechanism 41 includes a screw shaft 411 that is rotationally driven by the drive source 3, and a nut member 412 that is screwed onto the screw shaft 411. The conversion mechanism 41 converts the rotational motion of the screw shaft 411 into the linear motion of the nut member 412.

[0036] The screw shaft 411 is formed to extend along the axial direction L. A screw thread is formed on the outer periphery of the screw shaft 411. In this embodiment, the screw shaft 411 is connected to the drive shaft 31 of the drive source 3 so as to rotate integrally therewith.

[0037] When the screw shaft 411 rotates, the nut member 412 performs linear motion along the axial direction L according to the direction of rotation and the orientation of the threads of the screw shaft 411.

[0038] The connecting mechanism 42 connects the nut member 412 and the slide member 11 so as to link the linear motion of the nut member 412 with the sliding movement of the slide member 11. The connecting mechanism 42 is formed to extend along a radial direction R based on the first axis X1 and a direction passing through the axis of the screw shaft 411 (hereinafter referred to as a "connecting direction J"). In this embodiment, the connecting mechanism 42 includes a connecting member 421 and a pressing member 422.

[0039] The connecting member 421 is formed to connect the pressing member 422 and the nut member 412 of the conversion mechanism 41. The pressing member 422 moves in the axial direction L via the connecting member 421 in accordance with the linear motion of the nut member 412.

[0040] The pressing member 422 presses the slide member 11 toward either the first axial side L1 or the second axial side L2. In this embodiment, a groove having a first pressed surface 11a facing the second axial side L2 and a second pressed surface 11b facing the first axial side L1 is formed on the outer periphery of the slide member 11 so as to be recessed inward in the radial direction R. Then, the pressing member 422 moves toward the first axial side L1 and presses the first pressed surface 11a, so that the slide member 11 slides toward the first axial side L1. Also, the pressing member 422 moves toward the second axial side L2 and presses the second pressed surface 11b, so that the slide member 11 slides toward the second axial side L2. Although not shown, the pressing member 422 is formed in an arc shape along the circumferential direction centered on the first axis X1.

[0041] The detent mechanism 5 is a mechanism for maintaining a slide position, which is a position in the axial direction L, of the slide member 11. The detent mechanism 5 generates a converging force that causes the slide position of the slide member 11 to converge to each of a first position P1 and a second position P2. In this embodiment, the detent mechanism 5 also generates a converging force that causes the slide position of the slide member 11 to converge to a third position P3. In this embodiment, the detent mechanism 5 includes a detent member 51 and a biasing member 52.

[0042] The detent member 51 is connected to the nut member 412 via a connecting member 421 so as to move integrally with the nut member 412. The detent member 51 is disposed on the opposite side of the nut member 412 to the pressing member 422 in the connecting direction J. The detent member 51 is formed to extend in the axial direction L.

[0043] 3, in the detent member 51, valley portions 6 formed so as to be recessed on one side in the coupling direction J and peak portions 7 formed so as to protrude on the other side in the coupling direction J are alternately arranged in the axial direction L. In this embodiment, four peak portions 7 and three valley portions 6 are alternately arranged in order from the peak portion 7 toward the first axial side L1 from the second axial side L2.

[0044] In the following description, the three valleys 6 are referred to as the "first valley 6A", "second valley 6B", and "third valley 6C" in order from the second axial side L2. The four peaks 7 are referred to as the "first peak 7A", "second peak 7B", "third peak 7C", and "fourth peak 7D" in order from the second axial side L2. When simply referring to the valleys 6, the first valley 6A, the second valley 6B, and the third valley 6C are all represented without distinction. When simply referring to the peaks 7, the first peak 7A, the second peak 7B, the third peak 7C, and the fourth peak 7D are all represented without distinction.

[0045] In the following description, the side of the connecting mechanism 42 in the connecting direction J with respect to the detent member 51 is referred to as the "approaching side J1," and the opposite side is referred to as the "separating side J2."

[0046] In this embodiment, the three valley portions 6 and the four peak portions 7 are formed as three pairs of inclined surfaces 5a arranged side by side in the axial direction L. The pairs of inclined surfaces 5a are inclined so as to approach each other in the axial direction L toward the approach side J1. In this example, the three pairs of inclined surfaces 5a arranged side by side in the axial direction L are formed to have the same shape and size.

[0047] As shown in FIG. 2, the biasing member 52 includes a sphere 53 and a spring 54. The sphere 53 is formed to fit into the valley portion 6. Specifically, the sphere 53 is formed in a spherical shape having an outer diameter smaller than the distance in the axial direction L between the ends of the separated side J2 of the pair of inclined surfaces 5a. The spring 54 biases the sphere 53 toward the approach side J1. The end of the approach side J1 of the spring 54 is connected to the sphere 53. On the other hand, the end of the separated side J2 of the spring 54 is connected to a non-rotating member. In this embodiment, the end of the separated side J2 of the spring 54 is fixed to a second wall portion C2 of a case that houses a rotating electric machine MG or the like. The second wall portion C2 is formed to extend along the axial direction L.

[0048] In a state where the sphere 53 biased toward the approaching side J1 by the spring 54 is fitted into the valley portion 6, that is, in a state where it is supported by both of the pair of inclined surfaces 5a, the sphere 53 will not move relatively to the adjacent valley portion 6 unless the detent member 51 moves in the axial direction L so that the sphere 53 moves up the inclined surface 5a (moves to the separating side J2) and passes over the peak portion 7. If the detent member 51 moves in the axial direction L to an extent where the sphere 53 does not pass over the peak portion 7, the biasing force of the spring 54 causes the sphere 53 to move relatively so as to slide down the inclined surface 5a, and the position of the detent member 51 in the axial direction L returns to its original position. Therefore, in a state where the sphere 53 is fitted into the valley portion 6, it is difficult for the detent member 51 to move in the axial direction L so that the sphere 53 moves relatively to the adjacent valley portion 6.

[0049] In this embodiment, when the sphere 53 is fitted in the first valley portion 6A, the slide member 11 is located at the first position P1. Therefore, in this state, the transmission TM is in a state in which a low gear is formed. When the sphere 53 is fitted in the second valley portion 6B, the slide member 11 is located at the third position P3. Therefore, in this state, the transmission TM is in a neutral state. When the sphere 53 is fitted in the third valley portion 6C, the slide member 11 is located at the second position P2. Therefore, in this state, the transmission TM is in a state in which a high gear is formed.

[0050] Thus, in this embodiment, the detent mechanism 5 generates converging forces that cause the slide position of the slide member 11 to converge to each of the first position P1, the second position P2, and the third position P3.

[0051] As shown in FIG. 4, the drive device 2 includes a control device 9 that controls the drive source 3. The control device 9 includes a memory unit 91. The memory unit 91 is configured to store the slide position of the slide member 11 when the drive device 2 is stopped (here, when the vehicle on which the vehicle drive device 100 is mounted is stopped). In this embodiment, when a low gear is formed in the transmission TM, a first position P1 is stored in the memory unit 91. On the other hand, when a high gear is formed in the transmission TM, a second position P2 is stored in the memory unit 91. Also, in a neutral state in which no gear is formed in the transmission TM, a third position P3 is stored in the memory unit 91.

[0052] The control device 9 executes the first startup control when the slide position of the slide member 11 stored in the memory unit 91 is the target position Pa at the start of the drive device 2 (here, at the start of the vehicle equipped with the vehicle drive device 100). The target position Pa is either the first position P1 or the second position P2. In this embodiment, the target position Pa is the first position P1. Note that a non-target position Pb, which will be described later, is the other of the first position P1 and the second position P2. In this embodiment, the non-target position Pb is the second position P2.

[0053] In the first startup control, the control device 9 drives the drive source 3 in the target drive direction Dt by a set drive amount Qs that is set less than the specific drive amount Q. Thereafter, the control device 9 sets the drive force of the drive source 3 to be less than the convergence force of the detent mechanism 5 that converges the slide position of the slide member 11 to the target position Pa (for example, zero).

[0054] Here, as shown in FIG. 2, the symmetric drive direction Dt is the drive direction of the drive source 3 that slides the slide member 11 toward the axial symmetric side Lt (here, the axial first side L1), which is the side from the asymmetric position Pb (here, the second position P2) in the axial direction L toward the symmetric position Pa (here, the first position P1).

[0055] 3, the specific drive amount Q is a drive amount of the drive source 3 equivalent to moving the slide member 11 from the target position Pa (here, the first position P1) to the end of the axial target side Lt (here, the first axial side L1) in the convergence range A. The convergence range A is a range in which a convergence force of the detent mechanism 5 that converges the slide position of the slide member 11 to the target position Pa (here, the first position P1) is generated. In this embodiment, the convergence range A is the same size as the range in the axial direction L between the end of the separating side J2 of the first peak portion 7A and the end of the separating side J2 of the second peak portion 7B.

[0056] For ease of explanation, in FIG. 3, a convergence range A is shown between the end of the separating side J2 of the first ridge portion 7A and the end of the separating side J2 of the second ridge portion 7B in the axial direction L. However, since the convergence range A is within the range of the sliding position of the slide member 11, the actual position is different.

[0057] Similarly, the specific drive amount Q and the set drive amount Qs are different from the actual amounts shown in FIG. 3. In this embodiment, the specific drive amount Q is the drive amount of the drive source 3 for moving the slide member 11 by the length in the axial direction L from the end of the approach side J1 of the first valley portion 6A corresponding to the first position P1 to the end of the separation side J2 of the first peak portion 7A. Therefore, in FIG. 3, the length in the axial direction L from the end of the approach side J1 of the first valley portion 6A to the end of the separation side J2 of the first peak portion 7A is shown as the specific drive amount Q. In this embodiment, the set drive amount Qs is the drive amount of the drive source 3 for moving the slide member 11 by the length in the axial direction L from the end of the approach side J1 of the first valley portion 6A corresponding to the first position P1 to the middle of the axial direction L of the inclined surface 5a constituting the first valley portion 6A and the first peak portion 7A. 3, the length in the axial direction L from the end of the first valley portion 6A on the approach side J1 to the midpoint in the axial direction L of the inclined surface 5a adjacent to the second axial side L2 is shown as the set drive amount Qs. Note that the midpoint can be set to any position in the axial direction L on one inclined surface 5a.

[0058] As described above, in the first startup control, after the drive source 3 is driven by the set drive amount Qs, the drive force of the drive source 3 is set to be less than (for example, zero) the convergence force of the detent mechanism 5 that converges the slide position of the slide member 11 to the target position Pa (here, the first position P1). Therefore, in the first startup control of this embodiment, after the detent member 51 moves to the first axial side L1 to such an extent that the sphere 53 does not exceed the first peak portion 7A, the urging force of the spring 54 causes the sphere 53 to move relatively so as to slide down the inclined surface 5a, and the detent member 51 moves to the second axial side L2. As a result, the sphere 53 fits into the first valley portion 6A, and the slide position of the slide member 11 converges to the first position P1. When the drive device 2 is stopped (here, when the vehicle on which the vehicle drive device 100 is mounted is stopped), the current slide position of the slide member 11 is stored in the storage unit 91.

[0059] As described above, the meshing engagement device 10 has the following features: The device includes an interlocking engagement element 1 and a drive device 2 that drives the engagement element 1. The engaging element 1 includes a slide member 11 that slides in a specified axial direction L, and is configured to transition between a first engaged state and a second engaged state by the sliding movement of the slide member 11; The drive device 2 includes a drive source 3, a transmission mechanism 4 that transmits the drive force of the drive source 3 to a slide member 11, a detent mechanism 5 that maintains a slide position of the slide member 11 in an axial direction L, and a control device 9 that controls the drive source 3. The detent mechanism 5 generates a convergence force that causes the slide position to converge to a first position P1 corresponding to the first engagement state and a second position P2 corresponding to the second engagement state, One of the first position P1 and the second position P2 is a target position Pa, and the other is a non-target position Pb. The side from the asymmetric position Pb to the symmetric position Pa in the axial direction L is defined as the axial symmetric side Lt, The driving direction of the driving source 3 that slides the slide member 11 toward the axial symmetric side Lt is defined as a symmetric driving direction Dt. A range in which the convergence force of the detent mechanism 5 that converges the slide position to the target position Pa occurs is defined as a convergence range A, A drive amount of the drive source 3 corresponding to moving the slide member 11 from the target position Pa to the end of the axial target side Lt in the convergence range A is defined as a specific drive amount Q. The control device 9 is equipped with a memory unit 91 that stores the slide position when the drive device 2 is stopped, and when the drive device 2 is started, if the slide position stored in the memory unit 91 is the target position Pa, the control device 9 drives the drive source 3 in the target drive direction Dt by a set drive amount Qs that is set less than the specific drive amount Q, and then executes a first startup control that sets the drive force of the drive source 3 less than the convergence force of the detent mechanism 5.

[0060] According to this configuration, even if the slide position becomes uncertain due to backlash or the like of the transmission mechanism 4 when the drive device 2 is started, if the slide position at the time of the previous stop was the target position Pa, the slide member 11 is moved in the axial direction L within the convergence range A, and then the driving force of the drive source 3 is reduced, so that the slide position can be converged to the target position Pa by the convergence force of the detent mechanism 5. As a result, the gap caused by the backlash or the like of the transmission mechanism 4 can be narrowed in the target driving direction Dt, and the slide member 11 can be accurately positioned at the target position Pa. Therefore, the drive control of the slide member 11 can be accurately performed without installing a detection device that directly detects the slide position. As a result, since the installation of a detection device can be avoided, the size and cost of the meshing engagement device 10 can be kept small in a configuration including the slide member 11 that slides in the axial direction L. Furthermore, according to this configuration, the drive amount of the drive source 3 in the first startup control is limited to a set drive amount Qs that is set less than the specific drive amount Q. This makes it possible to shorten the drive time of the drive source 3 for the first startup control. Therefore, it is possible to quickly start control of the engagement element 1 after the start of the drive device 2.

[0061] In this embodiment, when the drive source 3 is stopped before being driven by the set drive amount Qs during execution of the first startup control, the control device 9 sets the drive force of the drive source 3 to be less than (for example, zero) the convergence force of the detent mechanism 5 that converges the slide position of the slide member 11 to the target position Pa (here, the first position P1). After that, the control device 9 executes the first startup control again.

[0062] According to this configuration, even if an abnormality occurs, such as a foreign object being caught in the transmission mechanism 4, the possibility of resolving the abnormality is increased by executing the first startup control again.

[0063] In the following description, the target drive direction Dt is referred to as the "first drive direction D1." The convergence range A is referred to as the "first convergence range A1." Furthermore, the specific drive amount Q is referred to as the "first drive amount Q1." Furthermore, the set drive amount Qs is referred to as the "first set drive amount Qs1."

[0064] In this embodiment, the control device 9 executes the second startup control when the slide position of the slide member 11 stored in the memory unit 91 is the second position P2 at the time of startup of the drive device 2. As described above, in this embodiment, the target position Pa is the first position P1, and the non-target position Pb is the second position P2. Therefore, in this embodiment, the control device 9 executes the first startup control when the slide position of the slide member 11 stored in the memory unit 91 is the first position P1 at the time of startup of the drive device 2, and executes the second startup control when it is the second position P2.

[0065] In the second startup control, the control device 9 drives the drive source 3 in the second drive direction D2 by a second set drive amount Qs2 that is set to be less than the second drive amount Q2. Thereafter, the control device 9 sets the drive force of the drive source 3 to be less than the convergence force of the detent mechanism 5 that converges the slide position of the slide member 11 to the second position P2 (for example, zero).

[0066] Here, as shown in FIG. 2, the second driving direction D2 is the driving direction of the driving source 3 that causes the sliding member 11 to slide toward the second axial side L2.

[0067] 3, the second drive amount Q2 is the drive amount of the drive source 3 equivalent to moving the slide member 11 from the second position P2 to the end of the second axial side L2 in the second convergence range A2. The second convergence range A2 is a range in which a convergence force of the detent mechanism 5 that converges the slide position to the second position P2 is generated. In this embodiment, the second convergence range A2 has a size similar to the range in the axial direction L between the end of the separating side J2 of the third peak 7C and the end of the separating side J2 of the fourth peak 7D.

[0068] For ease of explanation, in FIG. 3, the second convergence range A2 is shown between the end of the separating side J2 of the third ridge portion 7C and the end of the separating side J2 of the fourth ridge portion 7D in the axial direction L. However, since the second convergence range A2 is within the range of the sliding position of the slide member 11, the actual position is different.

[0069] Similarly, the second drive amount Q2 and the second set drive amount Qs2 are different from the actual amounts shown in FIG. 3. In this embodiment, the second drive amount Q2 is the drive amount of the drive source 3 for moving the slide member 11 by the length in the axial direction L from the end of the third valley portion 6C on the approach side J1 corresponding to the second position P2 to the end of the fourth peak portion 7D on the separation side J2. Therefore, in FIG. 3, the length in the axial direction L from the end of the third valley portion 6C on the approach side J1 to the end of the fourth peak portion 7D on the separation side J2 is shown as the second drive amount Q2. In this embodiment, the second set drive amount Qs2 is the drive amount of the drive source 3 for moving the slide member 11 by the length in the axial direction L from the end of the third valley portion 6C on the approach side J1 corresponding to the second position P2 to the middle of the axial direction L of the inclined surface 5a constituting the third valley portion 6C and the fourth peak portion 7D. Therefore, in Figure 3, the length in the axial direction L from the end of the approach side J1 of the third valley portion 6C to the middle part in the axial direction L of the inclined surface 5a adjacent to the first axial side L1 is shown as the second set driving amount Qs2.

[0070] As described above, in the second startup control, after the drive source 3 is driven by the second set drive amount Qs2, the drive force of the drive source 3 is set to be less than the convergence force of the detent mechanism 5 that converges the slide position of the slide member 11 to the second position P2 (for example, zero). Therefore, in the second startup control of this embodiment, after the detent member 51 moves to the second axial side L2 to such an extent that the sphere 53 does not pass the fourth peak portion 7D, the urging force of the spring 54 causes the sphere 53 to move relatively so as to slide down the inclined surface 5a, and the detent member 51 moves to the first axial side L1. As a result, the sphere 53 fits into the third valley portion 6C, and the slide position of the slide member 11 converges to the second position P2.

[0071] In this manner, in this embodiment, the target position Pa is the first position P1, and the non-target position Pb is the second position P2. The axial symmetric side Lt is defined as the first axial side L1, and the opposite side is defined as the second axial side L2. The target drive direction Dt is the first drive direction D1, the convergence range A is the first convergence range A1, the specific drive amount Q is the first drive amount Q1, and the set drive amount Qs is the first set drive amount Qs1, The drive direction of the drive source 3 that slides the slide member 11 toward the second axial side L2 is defined as a second drive direction D2, the range in which the convergence force of the detent mechanism 5 that converges the slide position to the second position P2 is generated is defined as a second convergence range A2, and the drive amount of the drive source 3 that corresponds to moving the slide member 11 from the second position P2 to the end of the second axial side L2 in the second convergence range A2 is defined as a second drive amount Q2, When the drive device 2 is started, if the slide position stored in the memory unit 91 is the second position P2, the control device 9 drives the drive source 3 in the second drive direction D2 by a second set drive amount Qs2 which is set less than the second drive amount Q2, and then executes a second startup control which sets the drive force of the drive source 3 less than the convergence force of the detent mechanism 5.

[0072] According to this configuration, when the drive device 2 is started, if the slide position stored in the memory unit 91 is the first position P1, the first start-up control is executed, and if the slide position is the second position P2, the second start-up control is executed. This makes it possible to accurately control the drive of the slide member 11 regardless of whether the slide position at the time of the previous stop was the first position P1 or the second position P2, and without installing a detection device that directly detects the slide position. Furthermore, according to this configuration, regardless of whether the slide position at the time of the previous stop was the first position P1 or the second position P2, the drive time of the drive source 3 for the first startup control can be kept short. Therefore, the control of the engagement element 1 after the start of the drive device 2 can be started quickly.

[0073] As shown in FIG. 5, in this embodiment, the detent mechanism 5 includes a restricting portion 55. The restricting portion 55 is configured to restrict the slide member 11 from moving toward the axial symmetric side Lt (here, the axial first side L1) from the restricted position Pr. In this embodiment, the first wall portion C1 functions as the restricting portion 55. Specifically, since the slide member 11 abuts against the first wall portion C1 from the axial second side L2 at the restricted position Pr, the slide member 11 is restricted by the first wall portion C1 from moving toward the axial first side L1 from the restricted position Pr. Here, the restricting position Pr is set on the axial symmetric side Lt (here, the axial first side L1) with respect to the target position Pa (here, the first position P1) within the convergence range A (first convergence range A1).

[0074] In this embodiment, the set drive amount Qs (first set drive amount Qs1) is set to the drive amount of the drive source 3 for moving the slide member 11 from the target position Pa (here, the first position P1) to the restriction position Pr. In Fig. 5, the length in the axial direction L from the end of the approach side J1 of the first valley portion 6A to the center of the sphere 53 when the slide member 11 is located at the restriction position Pr is shown as the set drive amount Qs (first set drive amount Qs1).

[0075] In this manner, in the present embodiment, the detent mechanism 5 includes the restriction portion 55 that restricts the slide member 11 from moving toward the axial symmetric side Lt beyond the restriction position Pr, The restriction position Pr is set on the axial symmetric side Lt with respect to the symmetric position Pa within the convergence range A, The set drive amount Qs is set to the drive amount of the drive source 3 for moving the slide member 11 from the target position Pa to the restriction position Pr.

[0076] According to this configuration, the first startup control can be a control in which the drive source 3 is driven in the target drive direction Dt until the movement of the slide member 11 is restricted by the restricting portion 55, and then the drive force of the drive source 3 is made less than the convergence force of the detent mechanism 5. Thereby, the control of the drive source 3 in the first startup control can be a control in which, for example, the slide member 11 is driven in the target drive direction Dt with a constant drive force until the movement of the slide member 11 is restricted by the restricting portion 55. Therefore, the first startup control can be further simplified and the slide member 11 can be accurately positioned at the target position Pa with greater precision.

[0077] In this embodiment, the driving source 3 is an electric motor, and the set driving amount Qs is set to a value equal to or greater than an electrical angle of 360 degrees of the electric motor.

[0078] According to this configuration, it is possible to energize the entire control circuit of the electric motor (for example, all switching elements) during the first startup control. Therefore, if there is an abnormality in the electric motor or the driver (inverter, etc.) of the electric motor, it is possible to increase the possibility of detecting the abnormality in the electric motor or the driver while the first startup control is being executed.

[0079] FIG. 6 is a flowchart showing an example of control processing by the control device 9, including the first startup control and the second startup control.

[0080] 6, first, the driving device 2 including the control device 9 is started (step #1). Then, the control device 9 determines whether the slide position of the slide member 11 stored in the memory unit 91 is the first position P1 or not (step #2).

[0081] If the slide position of the slide member 11 stored in the memory unit 91 is the first position P1 (step #2: Yes), the control device 9 executes the first startup control (step #3). On the other hand, if the slide position of the slide member 11 stored in the memory unit 91 is not the first position P1 (step #2: No), the control device 9 determines whether the slide position of the slide member 11 stored in the memory unit 91 is the second position P2 (step #4).

[0082] If the slide position of the slide member 11 stored in the memory unit 91 is the second position P2 (step #4: Yes), the control device 9 executes the second startup control (step #5). On the other hand, if the slide position of the slide member 11 stored in the memory unit 91 is not the second position P2 (step #4: No), the control device 9 executes control from step #7 described below without executing either the first startup control or the second startup control.

[0083] As shown in FIG. 7, in the first startup control, the control device 9 drives the driving source 3 in the first driving direction D1 (step #31). Then, the control device 9 checks whether the driving source 3 has stopped due to an abnormality such as a foreign object being caught in the transmission mechanism 4 (step #32). If the driving source 3 has stopped (step #32: Yes), the control device 9 sets the driving force of the driving source 3 to be less than (for example, zero) the convergence force of the detent mechanism 5 that converges the slide position of the slide member 11 to the first position P1 in order to execute the first startup control again in order to eliminate the abnormality (step #33). As a result, the slide position of the slide member 11 converges to the first position P1 due to the convergence force of the detent mechanism 5. Thereafter, the control device 9 executes the process again from the above step #31.

[0084] On the other hand, if the driving source 3 is not stopped (step #32: No), the control device 9 judges whether the driving source 3 has been driven by the first set driving amount Qs1 in the first driving direction D1 (step #34). If the control device 9 judges that the driving source 3 has not been driven by the first set driving amount Qs1 in the first driving direction D1 (step #34: No), the control device 9 executes the above step #31 again. On the other hand, if the control device 9 judges that the driving source 3 has been driven by the first set driving amount Qs1 in the first driving direction D1 (step #34: Yes), the control device 9 sets the driving force of the driving source 3 to be less than (for example, zero) the convergence force of the detent mechanism 5 that converges the slide position of the slide member 11 to the first position P1 (step #35).

[0085] As shown in FIG. 8, in the second startup control, the control device 9 drives the driving source 3 in the second driving direction D2 (step #51). Then, the control device 9 checks whether the driving source 3 has stopped due to an abnormality such as a foreign object being caught in the transmission mechanism 4 (step #52). If the driving source 3 has stopped (step #52: Yes), the control device 9 sets the driving force of the driving source 3 to be less than (for example, zero) the convergence force of the detent mechanism 5 that converges the slide position of the slide member 11 to the second position P2 (step #53) in order to execute the second startup control again in order to eliminate the abnormality. As a result, the slide position of the slide member 11 converges to the second position P2 due to the convergence force of the detent mechanism 5. Thereafter, the control device 9 executes the process again from the above step #51.

[0086] On the other hand, if the driving source 3 is not stopped (step #52: No), the control device 9 judges whether the driving source 3 has been driven by the second set driving amount Qs2 in the second driving direction D2 (step #54). If the control device 9 judges that the driving source 3 has not been driven by the second set driving amount Qs2 in the second driving direction D2 (step #54: No), the control device 9 executes the above step #51 again. On the other hand, if the control device 9 judges that the driving source 3 has been driven by the second set driving amount Qs2 in the second driving direction D2 (step #54: Yes), the control device 9 sets the driving force of the driving source 3 to be less than (for example, zero) the convergence force of the detent mechanism 5 that converges the slide position of the slide member 11 to the second position P2 (step #55).

[0087] 6, after the first startup control or the second startup control is completed, the control device 9 sets the slide position of the slide member 11, which has been converged by the converging force of the detent mechanism 5 and has stopped moving in the axial direction L, to a reference position (step #6). This reference position is used when calculating the relative position of the slide position of the slide member 11 moving in the axial direction L in the shift control of the transmission TM.

[0088] Thereafter, if a request to stop the driving device 2 including the control device 9 is made (step #7: Yes), the control device 9 stores the current slide position of the sliding member 11 in the memory unit 91 (step #8). Then, the driving device 2 is stopped (step #9).

[0089] Fig. 9 is a time chart showing an example of the first start-up control. As shown in Fig. 9, in order to drive the driving source 3 in the first driving direction D1, the driving force of the driving source 3 is controlled to approach the first driving force T1 from time t1 to time t2. Accordingly, the slide member 11 located at the pre-adjustment position P1a included in the first position P1 corresponding to the first engagement state (here, a state in which a low gear stage is formed in the transmission TM) gradually moves toward the restriction position Pr from time t1. At this time, the driving force of the driving source 3 is maintained at the first driving force T1.

[0090] After that, at time t3, the slide member 11 reaches the restriction position Pr. After the slide member 11 maintains the state of being positioned at the restriction position Pr, the driving force of the drive source 3 is controlled to approach zero from time t4 to time t5. Accordingly, the convergence force of the detent mechanism 5 moves the slide member 11 to a post-adjustment position P1b that is closer to the restriction position Pr than the pre-adjustment position P1a. This post-adjustment position P1b is set as the reference position of the slide position. Note that the post-adjustment position P1b is also included in the first position P1, just like the pre-adjustment position P1a. The pre-adjustment position P1a and the post-adjustment position P1b differ by an error caused by the backlash of the transmission mechanism 4 or the like. In other words, the first startup control eliminates the error of the slide position caused by the backlash of the transmission mechanism 4 or the like.

[0091] Other embodiments (1) In the above embodiment, when the slide position of the slide member 11 stored in the memory unit 91 is the third position P3 at the time of starting up the drive device 2, neither the first startup control nor the second startup control is executed. However, the third startup control may be executed as described below. For example, in the third startup control, the drive source 3 is driven so that the slide member 11 moves to a specified position within the third convergence range A3 (see FIG. 3 ), which is a range within which the convergence force of the detent mechanism 5 that converges the slide position to the third position P3 is generated, and then the drive force of the drive source 3 is set to less than the convergence force of the detent mechanism 5 (for example, zero).

[0092] (2) In the above embodiment, the sliding member 11 slides between the first position P1, the second position P2, and the third position P3. However, the present invention is not limited to such a configuration, and the sliding member 11 may slide between the first position P1 and the second position P2. Alternatively, the sliding member 11 may slide between four or more positions including the first position P1, the second position P2, and the third position P3.

[0093] (3) In the above embodiment, the target position Pa is the first position P1, and the non-target position Pb is the second position P2. However, the present invention is not limited to such a configuration, and the target position Pa may be the second position P2, and the non-target position Pb may be the first position P1.

[0094] (4) In the above embodiment, the detent mechanism 5 includes the restricting portion 55 that restricts the slide member 11 from moving toward the first axial side L1 beyond the restricting position Pr that is set on the first axial side L1 relative to the first position P1 in the first convergence range A1, and the first set drive amount Qs1 is set to the drive amount of the drive source 3 for moving the slide member 11 from the first position P1 to the restricting position Pr. However, the present invention is not limited to such a configuration, and the first set drive amount Qs1 may be set to a value different from the drive amount of the drive source 3 for moving the slide member 11 from the first position P1 to the restricting position Pr. In addition, the detent mechanism 5 may include a second restricting portion that restricts the slide member 11 from moving toward the second axial side L2 beyond the second restricting position that is set on the second axial side L2 relative to the second position P2 in the second convergence range A2. In this configuration, it is preferable that the second set drive amount Qs2 is set to a drive amount of the drive source 3 for moving the slide member 11 from the second position P2 to the second restriction position.

[0095] (5) In the above embodiment, the driving source 3 is an electric motor. However, the driving source 3 is not limited to such a configuration, and may be, for example, an actuator such as a solenoid or a hydraulic cylinder.

[0096] (6) In the above embodiment, an example has been described in which the first startup control is executed again if the driving source 3 stops while the first startup control is being executed. However, the present invention is not limited to such a configuration, and for example, the first startup control may not be executed if the driving source 3 stops while the first startup control is being executed.

[0097] (7) The configurations disclosed in the above-described embodiments can be applied in combination with configurations disclosed in other embodiments, as long as no contradiction occurs. As for other configurations, the embodiments disclosed in this specification are merely examples in all respects. Therefore, various modifications can be made as appropriate within the scope of the present disclosure. [Industrial Applicability]

[0098] The technology according to the present disclosure can be utilized in a meshing engagement device including a meshing engagement element and a drive device that drives the engagement element. [Explanation of symbols]

[0099] 10: meshing engagement device, 1: engagement element, 11: slide member, 2: drive device, 3: drive source, 4: transmission mechanism, 5: detent mechanism, 9: control device, 91: memory unit, P1: first position, P2: second position, Pa: target position, Pb: non-target position, A: convergence range, Q: specific drive amount, Qs: set drive amount, L: axial direction, Lt: axial target side, Dt: target drive direction

Claims

1. A meshing engagement device comprising a meshing engagement element and a drive device for driving the engagement element, The engagement element includes a slide member that slides in a specified axial direction, and is configured to transition between a first engagement state and a second engagement state by the sliding movement of the slide member, the drive device includes a drive source, a transmission mechanism that transmits a drive force of the drive source to the slide member, a detent mechanism that maintains a slide position, which is a position of the slide member in the axial direction, and a control device that controls the drive source; the detent mechanism generates a converging force that causes the slide position to converge to a first position corresponding to the first engagement state and a second position corresponding to the second engagement state, One of the first position and the second position is a target position, and the other is a non-target position; A side from the asymmetric position toward the symmetric position in the axial direction is defined as an axially symmetric side, a drive direction of the drive source that slides the slide member in the axial symmetrical direction is defined as a symmetric drive direction; a convergence range is a range in which the convergence force of the detent mechanism that converges the slide position to the target position occurs; a drive amount of the drive source corresponding to moving the slide member from the target position to an end portion on the axial target side in the convergence range is defined as a specific drive amount, The control device includes a memory unit that stores the slide position when the drive device is stopped, and when the drive device is started, if the slide position stored in the memory unit is the target position, the control device drives the drive source in the target drive direction by a set drive amount that is set less than the specific drive amount, and then executes a first startup control to make the drive force of the drive source less than the convergence force.

2. the target location is the first location and the non-target location is the second location, The axially symmetric side is defined as an axial first side, and the opposite side is defined as an axial second side, the target drive direction is a first drive direction, the convergence range is a first convergence range, the specific drive amount is a first drive amount, and the set drive amount is a first set drive amount; a drive direction of the drive source that slides the slide member toward the second axial side is defined as a second drive direction, a range in which the convergence force of the detent mechanism that converges the slide position to the second position is generated is defined as a second convergence range, and a drive amount of the drive source that corresponds to moving the slide member from the second position to an end portion on the second axial side in the second convergence range is defined as a second drive amount, 2. The meshing engagement device as described in claim 1, wherein, when the slide position stored in the memory unit is the second position at the time of startup of the drive device, the control device drives the drive source in the second drive direction by a second set drive amount that is set less than the second drive amount, and then executes a second startup control to make the drive force of the drive source less than the convergence force.

3. The detent mechanism includes a restricting portion that restricts the slide member from moving toward the axial symmetric side beyond a restricting position, the restriction position is set on the axially symmetric side with respect to the target position within the convergence range, The meshing engagement device according to claim 1 or 2, wherein the set drive amount is set to a drive amount of the drive source for moving the slide member from the target position to the regulating position.

4. the drive source is an electric motor, The meshing engagement device according to claim 1 , wherein the set drive amount is set to a value equal to or greater than an electrical angle of 360 degrees of the electric motor.

5. A meshing engagement device as described in any one of claims 1 to 4, wherein when the drive source stops before being driven by the set drive amount during execution of the first startup control, the control device reduces the drive force of the drive source to less than the convergence force and then executes the first startup control again.

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