JP2018141529A - Engagement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engagement device capable of suppressing a variation in the limit torque when the engagement teeth of one of a pair of members disengage from those of the other with engagement reaction force.SOLUTION: An engagement device 1 includes a slider 2 having a plurality of dog teeth 21, a sleeve 3 having a plurality of dog teeth 31 facing the plurality of dog teeth 21 in the axial direction, a movement mechanism 6 for moving the slider 2 back and forth in the axial direction, a stay 4 for supporting the sleeve 3 to be axially movable between a forward position where the dog teeth 31 can engage with the dog teeth 21 of the slider 2 and a retreat position further apart from the slider 2 than the forward position, and a torque limit spring 5 for energizing the sleeve 3 toward the forward position with respect to the stay 4. The sleeve 3, when moved to the retreat position with engagement reaction force between the dog teeth 21, 31, is released from the engagement with the slider 2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an engagement device in which meshing teeth formed on a pair of members are meshed with each other, and more particularly to an engagement device in which meshing between meshing teeth is released when the meshing reaction force exceeds a predetermined value.

  2. Description of the Related Art Conventionally, an engagement device in which meshing teeth formed on a pair of relatively rotatable members are meshed, for example, is mounted on a vehicle. Among such engagement devices, there is a device in which meshing between meshing teeth is released when the meshing reaction force becomes a predetermined value or more (see, for example, Patent Document 1).

  An engagement device (dog clutch device) described in Patent Document 1 includes a hub that rotates integrally with an input shaft, a dog piece that rotates integrally with an output shaft, and a moving mechanism that moves the hub in the axial direction with respect to the input shaft. Have. The hub is a second hub that is spline-fitted so as to be axially movable relative to the input shaft and is non-rotatable relative to the input shaft, and a first hub that is spline-fitted so as to be axially movable relative to the second hub and not relatively rotatable. And have. The first hub is disposed on the outer periphery of the second hub, and a coil-shaped set spring that biases the first hub toward the dog piece is disposed between the protrusion formed on the second hub and the first hub. Has been. On the axial end surface of the first hub facing the dog piece in the axial direction and on the axial end surface of the dog piece facing the first hub in the axial direction, dog teeth as a plurality of meshing teeth are formed. The dog teeth are formed in a trapezoidal shape (tapered shape) in which the meshing surface is inclined with respect to the axial direction.

  The moving mechanism includes a solenoid in which a shaft-like movable portion protrudes when energized, a shift rod that moves in the axial direction together with the movable portion of the solenoid, a shift fork coupled to the shift rod, and a fork claw provided on the shift fork. It has a cylindrical sleeve formed with a mating annular groove and a return spring that urges the shift fork in a direction opposite to the moving direction by the solenoid. The sleeve is disposed on the outer periphery of one axial end portion of the second hub, and moves the second hub forward and backward in the axial direction. The protrusion of the second hub is provided at a position between the first hub and the sleeve. The movement of the first hub toward the dog piece side with respect to the second hub is regulated by a set ring that protrudes from the outer peripheral portion of the second hub.

  When the second hub moves to the dog piece side by the moving mechanism, the dog teeth of the first hub mesh with and engage with the dog teeth of the dog piece, and torque is transmitted from the input shaft to the output shaft. In this state, when the meshing reaction force received by the dog teeth of the first hub from the dog teeth of the dog piece becomes a predetermined value or more, the set spring is compressed in the axial direction, and the first hub moves away from the dog piece. As a result, the meshing between the first hub and the dog piece is released, and torque is not transmitted from the input shaft to the output shaft.

JP-A-64-47622

  In the dog clutch device of Patent Document 1, when the second hub moves to the dog piece side by the moving force received from the sleeve, the friction resistance of the spline fitting portion between the first hub and the second hub, the inertia of the first hub, etc. There is a risk of meshing with the dog piece without moving axially until the first hub contacts the set spring. In this case, the mesh reaction between the first hub and the dog piece is released by a meshing reaction force smaller than the predetermined value. That is, the limit torque that is the upper limit value of the torque that can be transmitted from the input shaft to the output shaft is changed while maintaining the meshing between the dog teeth of the first hub and the dog teeth of the dog piece.

  Then, this invention aims at providing the engagement apparatus which can suppress the fluctuation | variation of a limit torque when engagement of each meshing teeth of a pair of members is cancelled | released by meshing reaction force. .

  In order to achieve the above object, the present invention has a first meshing member having a plurality of first meshing teeth and a plurality of second meshing teeth facing the plurality of first meshing teeth in the axial direction. A second meshing member, a moving mechanism for moving the first meshing member forward and backward in the axial direction, and the second meshing member such that the second meshing tooth is engageable with the first meshing tooth. A support member that supports an axial movement between an advance position and a retract position that is farther from the first engagement member than the advance position; and the second engagement member with respect to the support member. A biasing member made of an elastic body biasing toward the first, and the second meshing member moves to the retracted position by a meshing reaction force between the second meshing tooth and the first meshing tooth. Especially Ri, engagement between the first engagement member is released, to provide an engagement device.

  According to the engagement device according to the present invention, it is possible to suppress fluctuations in the limit torque when the engagement between the meshing teeth of the pair of members is released by the meshing reaction force.

It is explanatory drawing which shows the structural example of the outline of the drive system of the vehicle by which the engagement apparatus which concerns on embodiment of this invention is mounted. It is sectional drawing which shows the structural example of an engagement apparatus with a rotor shaft. It is a fragmentary sectional view of the engaging device which shows the operation state which was energized to the electromagnetic coil and the dog tooth of the slider and the dog tooth of the sleeve meshed. It is a fragmentary sectional view of the engaging device which shows the 1st damage prevention operation state where the sleeve moved to the retreat position by dog dog meshing reaction force. It is a fragmentary sectional view of the engaging device which shows the 2nd damage prevention operation state which the slider moved by meshing reaction force of dog teeth. It is a figure which shows the end surface of the axial direction one side of a slider. It is a figure which shows the end surface of the axial direction one side of a sleeve. It is the figure which looked at the dog teeth of the slider and the dog teeth of the sleeve from the outer peripheral side, (a) shows a state where the dog teeth are engaged, (b) shows a state where the engagement of the dog teeth is released. It is a graph which shows an example of the relationship between the exciting current supplied to an electromagnetic coil, and a limit torque. (A) And (b) is a fragmentary sectional view which shows the engaging apparatus which concerns on a comparative example.

[Embodiment]
Embodiments of the present invention will be described with reference to FIGS. In addition, although embodiment described below is shown as a suitable specific example in implementing this invention, although there are some parts which have illustrated various technical matters that are technically preferable. The technical scope of the present invention is not limited to this specific embodiment.

  FIG. 1 is an explanatory diagram illustrating a schematic configuration example of a drive system of a vehicle on which an engagement device according to an embodiment of the present invention is mounted. This vehicle is a so-called hybrid vehicle having an engine that is an internal combustion engine and an electric motor (motor generator) that is also used as a generator as drive sources. In the present embodiment, two motor generators are mounted on the vehicle as drive sources.

  The vehicle 100 includes an engine E, a first motor generator MG1, a power distribution mechanism 102 to which the engine E and the first motor generator MG1 are connected, and an output gear 104 for outputting power to the drive wheels 103. And a second motor generator MG2 coupled to the output gear 104 via the speed reduction mechanism 105, the engagement device 1, and the rotor shaft 10 braked by the engagement device 1 are provided as a drive mechanism. The power of the output gear 104 is transmitted to the left and right drive wheels 103 via the differential mechanism 106.

  The power of the engine E is transmitted to the power distribution mechanism 102 via the output shaft 107. A damper 108 is interposed between the output shaft 107 and the engine E, and the torque fluctuation of the engine E is absorbed by the damper 108.

  The first motor generator MG1 includes a stator 109a fixed to a casing 9 as a fixing member, and a rotor 109b arranged coaxially inside the stator 109a. Similarly, the second motor generator MG2 includes a stator 110a fixed to the casing 9, and a rotor 110b arranged coaxially inside the stator 110a. The casing 9 is fixed to the vehicle body and accommodates the first and second motor generators MG1, MG2, the power distribution mechanism 102, the speed reduction mechanism 105, the engagement device 1, and the rotor shaft 10 therein.

  The power distribution mechanism 102 is composed of a single pinion type planetary gear mechanism having three elements that can rotate differentially with each other, and is coaxial with the sun gear S1 as an external gear having gear teeth on the outer peripheral surface thereof. A ring gear R1 as an internal gear disposed and having gear teeth on the inner peripheral surface, a plurality of pinion gears P1 meshing with these gears S1, R1, and a carrier C1 holding the plurality of pinion gears P1 so as to be capable of rotating and revolving. I have. Output shaft 107 is connected to carrier C1, rotor 109b of first motor generator MG1 is connected to sun gear S1 via rotor shaft 10, and output gear 104 is connected to ring gear R1.

  The speed reduction mechanism 105 has three elements that can rotate differentially with each other, and is composed of a single pinion type planetary gear mechanism that reduces the rotation of the second motor generator MG2 and transmits it to the output gear 104. A sun gear S2, a ring gear R2 as an internal gear disposed coaxially with the sun gear S2, a pinion gear P2 meshing with the gears S2 and R2, and a carrier C2 holding the pinion gear P2 so as to be rotatable and revolved. I have. The rotor 110b of the second motor generator MG2 is connected to the sun gear S2, the output gear 104 is connected to the ring gear R2, and the carrier C2 is fixed to the casing 9. Thereby, the rotation of second motor generator MG2 is decelerated and transmitted to output gear 104.

  Engagement device 1 is used to stop the rotation of rotor shaft 10 when first motor generator MG1 is not in operation. When the engagement device 1 is operated and the rotation of the rotor shaft 10 is stopped, the idling of the sun gear S1 of the power distribution mechanism 102 is prevented, and the output of the engine E is transmitted via the carrier C1, the plurality of pinion gears P1, and the ring gear R1. Is transmitted to the output gear 104.

  FIG. 2 is a cross-sectional view showing a configuration example of the engagement device 1 together with a part of the rotor shaft 10. The casing 9 includes first to third wall portions 91 to 93, and the engagement device 1 is disposed between the first wall portion 91 and the third wall portion 93. The rotor shaft 10 is inserted into an insertion hole 910 provided in the first wall portion 91 and an insertion hole 930 provided in the third wall portion 93, and a ball bearing 911 disposed inside the insertion holes 910 and 930. , 931 are rotatably supported. In FIG. 2, a part of the rotor shaft 10 between the first wall portion 91 and the third wall portion 93 is broken away. Hereinafter, a direction parallel to the rotation axis O of the rotor shaft 10 is referred to as an axial direction.

  The engagement device 1 includes a slider 2 as a first engagement member that is connected to the rotor shaft 10 so as to be axially movable and relatively non-rotatable, and a sleeve 3 as a second engagement member that engages with the slider 2. A stay 4 as a support member that supports the sleeve 3 so as to be movable in the axial direction, a torque limit spring 5 as a biasing member that biases the sleeve 3 toward the slider 2 with respect to the stay 4, and the slider 2 as a rotor shaft 10. And a moving mechanism 6 that moves forward and backward in the axial direction.

  The slider 2 includes a plurality of splines that are spline-engaged with a substantially cylindrical main body 20, a plurality of dog teeth 21 as first meshing teeth, and a plurality of spline protrusions 101 formed on the outer peripheral surface of the rotor shaft 10. The protrusion 22 is integrally formed. A part of the main body 20 is disposed inside the yoke 62, and the outer diameter of the end on the side where the dog teeth 21 are formed is larger than the inner diameter of the yoke 62. The dog teeth 21 are formed on the end surface in the axial direction facing the sleeve 3 of the main body 20, and project in the axial direction toward the sleeve 3. The spline protrusion 22 is formed on the inner peripheral surface of the main body portion 20.

  The sleeve 3 includes an annular main body 30, a plurality of dog teeth 31 as second meshing teeth facing the plurality of dog teeth 21 of the slider 2 in the axial direction, and a plurality of teeth formed on the inner peripheral surface of the main body 30. The spline protrusion 32 is integrally formed. When the dog teeth 31 of the sleeve 3 and the dog teeth 21 of the slider 2 are engaged with each other and engaged, the slider 2 and the sleeve 3 are connected so as not to rotate relative to each other.

  The stay 4 is formed on a cylindrical cylindrical portion 40 through which the rotor shaft 10 is inserted, an annular plate-shaped flange portion 41 protruding outward from one axial end portion of the cylindrical portion 40, and an outer peripheral surface of the cylindrical portion 40. A plurality of spline protrusions 42 are integrally provided. The spline protrusions 42 of the sleeve 3 engage with the spline protrusions 42 of the stay 4, and the sleeve 3 can move in the axial direction within a predetermined range with respect to the stay 4 and cannot rotate relative to the stay 4. The flange portion 41 of the stay 4 is fixed to the third wall portion 93 of the casing 9 with a plurality of bolts 94.

  Further, the stay 4 is provided with a retaining ring 43 as a contact portion for restricting the movement of the sleeve 3 toward the slider 2 side. The retaining ring 43 is made of, for example, a snap ring, and is fitted on the outer peripheral surface of the end portion of the cylindrical portion 40 opposite to the flange portion 41. The stay 4 supports the sleeve 3 so that the dog teeth 31 can move in the axial direction between a forward position where the dog teeth 31 can engage with the dog teeth 21 of the slider 2 and a retracted position farther away from the slider 2 than the forward position. Yes. The sleeve 3 abuts against the retaining ring 43 at the forward movement position, and the dog teeth 31 do not engage with the dog teeth 21 of the slider 2 at the backward movement position.

  The torque limit spring 5 is made of an elastic body that biases the sleeve 3 toward the advance position with respect to the stay 4. In the present embodiment, the torque limit spring 5 is composed of a plurality (six in the illustrated example of FIG. 2) disc springs 51 arranged in parallel in the axial direction, and between the body portion 30 of the sleeve 3 and the flange portion 41 of the stay 4. Is arranged. The torque limit spring 5 is in a state of being compressed in the axial direction rather than the natural length in a state where the sleeve 3 is in contact with the retaining ring 43. That is, even when the sleeve 3 is in contact with the retaining ring 43, the torque limit spring 5 generates a biasing force that presses the sleeve 3 against the retaining ring 43 by its restoring force.

  The moving mechanism 6 includes an electromagnet 60 having a coil member 61 and a yoke 62, an armature 7 that moves in the axial direction by the magnetic force of the electromagnet 60, a return spring 80 as a return spring, and first and second bearings 81 and 82. And have. The first bearing 81 is disposed between the armature 7 and one axial end of the slider 2, and the second bearing 82 is disposed between the return spring 80 and the other axial end of the slider 2. Yes. In the present embodiment, the first and second bearings 81 and 82 are thrust roller bearings.

  The yoke 62 is U-shaped having an opening 620 on one side in the axial direction, and holds the coil member 61 therein. The coil member 61 is formed by sealing an electromagnetic coil 611 formed by winding an enamel wire with a sealing member 612 made of resin. The yoke 62 serves as a magnetic path for magnetic flux generated by energization of the electromagnetic coil 611. The armature 7 forms a magnetic path of this magnetic flux together with the yoke 62.

  In the present embodiment, when the electromagnetic coil 611 is energized, the armature 7 moves the slider 2 to the sleeve 3 side, and when the energization to the electromagnetic coil 611 is interrupted, the slider 2 is moved by the urging force of the return spring 80. Separate from the sleeve 3. That is, the return spring 80 moves the slider 2 in the direction opposite to the moving direction when the electromagnetic coil 611 is energized. The armature 7 presses the slider 2 in the axial direction with a pressing force corresponding to the exciting current supplied to the electromagnetic coil 611.

  One end of the return spring 80 in the axial direction is in contact with the stay 4, and the other end of the return spring 80 is in contact with the second bearing 82. In the present embodiment, the return spring 80 is composed of a plurality of disc springs 801 (four in the illustrated example of FIG. 2). These disc springs 801 are ring-shaped through which the rotor shaft 10 is inserted, and are arranged in parallel in the axial direction. Each of the disc springs 801 is in contact with the disc springs 801 whose outer diameter side ends or inner diameter side ends are adjacent to each other.

  The return spring 80 is compressed in the axial direction when the slider 2 moves toward the sleeve 3, and urges the slider 2 in a direction away from the sleeve 3 by its restoring force. Note that the return spring 80 may be constituted by, for example, a plurality or a single coil spring. However, by constituting the return spring 80 with a plurality of disc springs 801, the return spring 80 can generate a large biasing force at a low cost while ensuring the amount of movement of the slider 2 to be biased in the axial direction. It can be. The same applies to the torque limit spring 5.

  The armature 7 includes a disc-shaped main body 70 in which an insertion hole 700 through which the rotor shaft 10 is inserted is formed at the center, and a cylindrical shape formed so as to protrude in the axial direction from one axial end surface of the main body 70. The guide portion 71 and the boss portion 72 that protrudes in the axial direction from the other axial end surface of the main body portion 70 and contacts the first wall portion 91 are integrally provided. Inside the guide part 71, the axial end part of the 1st bearing 81 and the slider 2 is arrange | positioned. The main body portion 70 of the armature 7 faces the yoke 62 in the axial direction, and when the armature 7 moves to the yoke 62 side by the magnetic force of the electromagnet 60, an axial gap (air) is formed between the main body portion 70 and the yoke 62. A gap).

  When the armature 7 moves in the axial direction, the outer peripheral surface of the guide portion 71 slides on a slide bush 63 made of resin fitted to the inner peripheral surface of the yoke 62. Specifically, PA (polyamide), PET (polyethylene terephthalate), POM (polyacetal), etc. excellent in low friction and wear resistance can be suitably used as the material of the slide bush 63. The armature 7 can smoothly move in the axial direction when the guide portion 71 contacts the slide bush 63, and the radial position with respect to the yoke 62 is defined.

  The yoke 62 is fixed to the second wall portion 92 of the casing 9 with a plurality of bolts 95. A return spring 64 that separates the main body 70 of the armature 7 from the yoke 62 is disposed in the opening 620 of the yoke 62. In the present embodiment, the return spring 64 is composed of a single disc spring, and one axial end thereof is in contact with the coil member 61, and the other axial end is in contact with the main body portion 70 of the armature 7. . The spring constant of the return spring 64 is smaller than the spring constants of the torque limit spring 5 and the return spring 80, and is about 1/100 of the spring constants of the torque limit spring 5 and the return spring 80, for example.

  When the armature 7 is energized to the electromagnetic coil 611, the main body portion 70 approaches the yoke 62 and presses the slider 2 in the axial direction via the first bearing 81. At this time, the armature 7 presses the slider 2 in the axial direction against the return spring 80. Further, in the armature 7, when the energization of the electromagnetic coil 611 is interrupted, the main body portion 70 is separated from the yoke 62 until the boss portion 72 contacts the first wall portion 91 by the urging force of the return spring 64. Accordingly, the slider 2 moves in the axial direction by the urging force of the return spring 80.

  The engagement device 1 is torqued by the meshing reaction force of the dog teeth 21 and 31 so that the engagement device 1 and the power distribution mechanism 102 are not damaged even if an impact load is applied to the rotor shaft 10 during operation. The limit spring 5 is compressed, the sleeve 3 is moved to the retracted position, and the engagement state between the slider 2 and the sleeve 3 is released. When the current supplied to the electromagnetic coil 611 is smaller than a predetermined value, the slider 2 moves in the axial direction together with the armature 7 by the meshing reaction force of the dog teeth 21 and 31, so that the slider 2 and the sleeve 3 The engagement state is released. Next, the configuration and principle of this damage prevention operation will be described in detail with reference to FIGS.

  FIG. 3 is a partial cross-sectional view of the engagement device 1 showing an operating state in which the electromagnetic coil 611 is energized and the dog teeth 21 of the slider 2 and the dog teeth 31 of the sleeve 3 are engaged with each other. FIG. 4 shows the first damage prevention operation state in which the sleeve 3 is moved to the retracted position by the meshing reaction force of the dog teeth 21 and 31 and the engagement state between the slider 2 and the sleeve 3 is released. FIG. FIG. 5 is a partial sectional view of the engagement device 1 showing a second damage prevention operation state in which the slider 2 is moved by the meshing reaction force of the dog teeth 21 and 31 and the engagement state between the slider 2 and the sleeve 3 is released. FIG.

  FIG. 6 is a view showing an end face of the slider 2 on one side in the axial direction. FIG. 7 is a view showing an end surface of the sleeve 3 on one side in the axial direction. FIG. 8 is a view of the dog teeth 21 of the slider 2 and the dog teeth 31 of the sleeve 3 as seen from the outer peripheral side. FIG. 8A shows the state where the dog teeth 21 and 31 are engaged, and FIG. 8B shows the dog tooth 21. , 31 are shown in a released state.

  As shown in FIG. 6, the plurality of dog teeth 21 of the slider 2 have a tooth height in the axial direction, and the tooth traces are formed in a radial shape extending in the radial direction perpendicular to the rotation axis O. . On the outer diameter side of the plurality of spline protrusions 22, a flat contact surface 20 a with which the second bearing 82 contacts is formed. Each dog tooth 21 has an involute tooth profile in which the tooth tip surface 21a is planar and the tooth surfaces 21b on both sides in the circumferential direction of the tooth tip surface 21a are involute curves.

  As shown in FIG. 7, the dog teeth 31 of the sleeve 3 have a tooth height in the axial direction and the tooth traces extend in the radial direction perpendicular to the rotation axis O, similarly to the dog teeth 21 of the slider 2. It is formed radially. A flat contact surface 30 a that contacts the retaining ring 43 is formed on the outer diameter side of the plurality of spline protrusions 32. Each of the dog teeth 31 has an involute tooth profile in which the tooth tip surface 31a is planar and the tooth surfaces 31b on both sides in the circumferential direction of the tooth tip surface 31a are involute curves.

  The plurality of dog teeth 21 of the slider 2 and the plurality of dog teeth 31 of the sleeve 3 have the same specifications such as tooth height, tooth width, number of teeth and pitch. Further, as shown in FIG. 8, the dog teeth 21 and 31 have a substantially trapezoidal shape in which the tooth thickness becomes smaller at the tip portions on the side of the tooth tip surfaces 21a and 31a.

  As shown in FIG. 8A, when the dog teeth 21 of the slider 2 and the dog teeth 31 of the sleeve 3 mesh with each other, and the slider 2 receives torque (relative torque) rotating from the rotor shaft 10 to the sleeve 3. A meshing reaction force (hereinafter simply referred to as “reaction force”) acts on the dog teeth 21, 31. This reaction force increases as the torque received by the slider 2 increases.

In FIG. 8 (a), it shows the reaction force dog teeth 21 of the slider 2 receives a vector Rf _2, which shows the axial component vector Ra _2, the circumferential direction component vector Rc _2. Further, in FIG. 8 (a), shows the reaction force dog teeth 31 of the sleeve 3 is subjected shown in vector Rf _3, the axial component vector Ra _3, the circumferential direction component in the vector Rc _3. The vector Rf ₂ and the vector Rf ₃ are the same in magnitude and opposite in direction. When the torque received by the slider 2 increases, the torque limit spring 5 is pushed back by the axial component (vector Ra ₃ ) of the reaction force received by the sleeve 3. Further, the armature 7 is pushed back by the axial component (vector Ra ₂ ) of the reaction force received by the slider 2.

  When the torque received by the slider 2 from the rotor shaft 10 increases, the sleeve 3 moves to the retracted position when the urging force received by the sleeve 3 from the torque limit spring 5 is smaller than the pressing force received by the slider 2 from the armature 7. . Thereby, as shown in FIG. 4, the meshing of the dog teeth 21 and 31 is released. When the pressing force received by the slider 2 from the armature 7 is smaller than the urging force received by the sleeve 3 from the torque limit spring 5, the slider 2 moves in the axial direction in a direction away from the sleeve 3. Thereby, the meshing of the dog teeth 21 and 31 is released as shown in FIG.

  When the meshing of the dog teeth 21 and 31 is released by the reaction force while the electromagnetic coil 611 is energized, the dog teeth 21 and 31 are respectively connected to the tooth tip surfaces 21a and 21a, as shown in FIG. 31a is in sliding contact.

  FIG. 9 is a graph showing an example of the relationship between the excitation current supplied to the electromagnetic coil 611 and the torque (limit torque) acting on the slider 2 when the dog teeth 21 and 31 are disengaged. This limit torque is an upper limit value of the torque that can be applied to the slider 2 while maintaining the engagement of the dog teeth 21 and 31.

As shown in FIG. 9, when the exciting current is larger than the predetermined current value I ₁ , the biasing force received by the sleeve 3 is smaller than the pressing force received by the slider 2, and the limit torque is applied to the torque limit spring 5. constant the torque value T ₁ corresponding to the force. On the other hand, when the excitation current is less than the current value I ₁ is the limit torque is smaller than the torque value T _1, a value corresponding to the exciting current. Therefore, it is possible to increase or decrease the limit torque by adjusting the excitation current supplied to the electromagnetic coil 611.

(Comparative example)
FIGS. 10A and 10B are partial cross-sectional views showing an engaging device 1A according to a comparative example. 10 (a) and 10 (b), members that are the same as those described with reference to FIG. 2 and the like are denoted by the same reference numerals, and redundant description is omitted.

  The engaging device 1A includes a slider 2A having dog teeth 23 and spline protrusions 24, a sleeve 3A having dog teeth 33 and spline protrusions 34, a support member 4A that supports the slider 2A so as to be movable in the axial direction, and a slider 2A. A restricting member 4B for restricting the axial movement of the sleeve 3A in the separating direction, a torque limit spring 5A, an electromagnet 60, an armature 7A that moves in the axial direction by the magnetic force of the electromagnet 60, and first and second bearings. 83, 84. The dog teeth 23 and 33 have the same involute tooth profile as the dog teeth 21 and 31 of the engaging device 1 described above. The spline protrusion 34 of the sleeve 3 </ b> A is spline-engaged with the spline protrusion 101 of the rotor shaft 10.

  The support member 4 </ b> A integrally includes a cylindrical portion 44 and a flange portion 45, and the flange portion 45 is fixed to the first wall portion 91 with a bolt 96. A plurality of spline protrusions 46 are formed on the outer peripheral surface of the cylindrical portion 44. The spline protrusions 46 of the slider 2 </ b> A engage with the spline protrusions 46. The restricting member 4 </ b> B is an annular plate-like member through which the rotor shaft 10 is inserted, and is fixed to the third wall portion 93 by a bolt 97. Further, the regulating member 4B has the sleeve 3A sandwiched between the supporting member 4A, the first bearing 83 is disposed between the supporting member 4A and the sleeve 3A, and the second between the regulating member 4B and the sleeve 3A. The bearing 84 is arranged.

  The armature 7A includes a main body portion 73, a guide portion 74 and a spring holding portion 75 that are formed so as to protrude in the axial direction from one axial end surface of the main body portion 73, and an axial direction from the other axial end surface of the main body portion 73. It has a boss portion 76 that protrudes and abuts against the flange portion 45 of the support member 4A. Both the guide part 74 and the spring holding part 75 are cylindrical, and the spring holding part 75 is formed inside the guide part 74.

  When the armature 7A moves in the axial direction, the outer peripheral surface of the guide portion 74 slides on the slide bush 63. In an annular space between the guide portion 74 and the spring holding portion 75, a torque limit spring 5A including a plurality of disc springs 52 is disposed. One end of the torque limit spring 5A in the axial direction is in contact with the main body 73 of the armature 7A, and the other end is in contact with the slider 2A.

  When the electromagnetic coil 611 of the electromagnet 60 is energized, the main body 73 of the armature 7A is attracted to the yoke 62 by the magnetic force, and the armature 7A moves in the axial direction. At this time, the armature 7A elastically presses the slider 2A toward the sleeve 3A via the torque limit spring 5A. The dog teeth 23 of the slider 2A are engaged with the dog teeth 33 of the sleeve 3A by the biasing force of the torque limit spring 5A. Thereby, rotation of the rotor shaft 10 stops.

  When the torque that the sleeve 3A receives from the rotor shaft 10 increases, the torque limit spring 5A is compressed in the axial direction, the slider 2A moves, and the meshing of the dog teeth 23 and 33 is released. At this time, if the excitation current supplied to the electromagnetic coil 611 is equal to or greater than a predetermined value, the slider 2A moves by compressing the torque limit spring 5A, and the excitation current supplied to the electromagnetic coil 611 is less than the predetermined value. In this case, the slider 2A moves in the axial direction together with the armature 7A. The limit torque when the slider 2A moves in the axial direction together with the armature 7A (the upper limit value of the torque that can be applied to the sleeve 3A while maintaining the engagement of the dog teeth 23 and 33) is that the torque limit spring 5A is compressed. Thus, the torque becomes smaller than the limit torque when the slider 2A moves.

  In the engaging device 1A according to this comparative example, when the electromagnetic coil 611 is energized and the slider 2A moves to the sleeve 3A side, the slider 2A has an inertia due to the inertia of the slider 2A and the frictional resistance between the spline protrusion 24 and the spline protrusion 46. The dog teeth 23 and the dog teeth 33 of the sleeve 3A are slightly meshed with each other and may be meshed with each other in a state where they are not completely meshed. In this case, the meshing reaction force between the dog tooth 23 of the slider 2A and the dog tooth 33 of the sleeve 3A is released by a meshing reaction force smaller than the expected value.

  Further, in the engaging device 1A, when the torque limit spring 5A is compressed, the torque limit spring 5A is constituted by the plurality of disc springs 52 that are deformed in the axial direction and the radial direction when pressed in the axial direction. Further, the armature 7A receives a radial force from the disc spring 52, and the radial force may increase the sliding resistance between the guide portion 74 and the slide bush 63. In this case, when the slider 2 </ b> A moves in the axial direction together with the armature 7 </ b> A due to the meshing reaction force of the dog teeth 23 and 33, the limit torque is likely to fluctuate due to the sliding resistance between the guide portion 74 and the slide bush 63. As a result, when the limit torque is increased or decreased by adjusting the excitation current supplied to the electromagnetic coil 611, it is difficult to set the limit torque to a desired value.

(Operation and effect of the embodiment)
According to the embodiment described above, when the armature 7 moves the slider 2, the slider 2 is pressed without an elastic body such as a spring, so that the slider 2 can be surely connected regardless of the inertia of the slider 2. The dog teeth 21 and the dog teeth 31 of the sleeve 3 can be engaged with each other. In particular, in the present embodiment, even when the sleeve 3 is in contact with the retaining ring 43, the torque limit spring 5 generates a biasing force that presses the sleeve 3 against the retaining ring 43, so this effect can be achieved more reliably. The

  Further, in the present embodiment, the armature 7 does not receive a radial force from the disc spring, so that the guide portion 71 of the armature 7 is smoothly guided in the axial direction by the slide bush 63. Accordingly, for example, as in the engagement device 1A according to the comparative example, the limit torque is prevented from fluctuating due to the sliding resistance with the slide bush 63.

(Appendix)
As mentioned above, although this invention was demonstrated based on embodiment, these embodiment does not limit the invention which concerns on a claim. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

  Further, the present invention can be appropriately modified and implemented without departing from the spirit of the present invention. For example, in the above-described embodiment, the case where the engagement device 1 is used in the drive system of the vehicle 100 has been described. However, the engagement device 1 can also be used for other equipment such as a machine tool.

  In the above-described embodiment, the case where the engagement device 1 is used to stop the rotation of the rotor shaft 10 that is a rotating member with respect to the casing 9 has been described. However, the present invention is not limited to this. An engaging device according to the present invention may be used to connect such a pair of rotating members so as to transmit torque. In this case, the first engaging member of the present invention corresponds to one rotating member of the pair of rotating members, and the second engaging member corresponds to the other rotating member.

DESCRIPTION OF SYMBOLS 1 ... Engagement device 2 ... Slider (1st meshing member)
21 ... Dog teeth (first meshing teeth) 3 ... Sleeve (second meshing members)
31 ... Dog teeth (second meshing teeth) 4 ... Stay (supporting member)
5 ... Torque limit spring (biasing member) 6 ... Moving mechanism 60 ... Electromagnet 611 ... Electromagnetic coil 62 ... Yoke 7 ... Armature 80 ... Return spring (return spring)

Claims (4)

A first meshing member having a plurality of first meshing teeth;
A second meshing member having a plurality of second meshing teeth facing the plurality of first meshing teeth in the axial direction;
A moving mechanism for moving the first meshing member forward and backward in the axial direction;
The second meshing member is pivoted between a forward position where the second meshing tooth can be engaged with the first meshing tooth and a retracted position which is farther from the first meshing member than the forward position. A support member that is movably supported, and
An urging member made of an elastic body that urges the second engagement member toward the advance position with respect to the support member;
The second meshing member is moved to the retracted position by the meshing reaction force between the second meshing tooth and the first meshing tooth, so that the engaged state with the first meshing member is released. The
Engagement device. The moving mechanism includes an electromagnetic coil and an electromagnet having a yoke serving as a magnetic path of magnetic flux generated by energization of the electromagnetic coil, and an armature that moves by the magnetic force of the electromagnet, and the armature is supplied to the electromagnetic coil. Pressing the first meshing member in the axial direction with a pressing force according to the excitation current
The engagement device according to claim 1. The moving mechanism has a return spring that moves the first meshing member in a direction opposite to a moving direction when the electromagnetic coil is energized;
The armature presses the first meshing member against the return spring when the electromagnetic coil is energized;
The engagement device according to claim 2. The support member is provided with an abutting portion that abuts on the second meshing member at the advance position and regulates the movement of the second meshing member toward the first meshing member,
The biasing member generates a biasing force that presses the second engagement member against the contact portion even when the second engagement member is in contact with the contact portion.
The engagement device according to any one of claims 1 to 3.

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