JP2014194233A - Dog clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an impact at gearing engagement.SOLUTION: A dog clutch comprises: an annular first engagement element 10 which is reciprocal to the axial direction; an annular second engagement element 20 geared with the first engagement element 10 which moves to the axial direction; a circumferential tooth row composed of a plurality of teeth 12, 22 arranged at the first engagement element 10 and the second engagement element 20; a cylindrical or columnar holding member 30 formed with a circumferential face for holding the second engagement element 20; and a spiral spline 31 formed between the second engagement element 20 and the holding member 30 with the axial direction as a center. The teeth 12, 22 forming the tooth row are formed so that portions opposing the other engagement element in the axial direction become apex faces 12a, 22a which are vertical to the axial direction, and the spline 31 has a twist angle in a direction in which a gearing depth at the gearing of the first engagement element 10 and the second engagement element 20 is enlarged.

Description

  The present invention relates to a dog clutch that connects and disconnects torque transmission by switching between a separated state and a meshed state of two engaging elements.

  Conventionally, this type of dog clutch is known. For example, the following Patent Document 1 and Patent Document 2 disclose various tooth (dog teeth) shapes. The dog tooth shown in Patent Document 1 is inserted into a rectangular groove. As for this dog tooth, the cross section cut in the direction orthogonal to the insertion direction is rectangular at the base, and is triangular (tapered) at the tip. Japanese Patent Application Laid-Open No. H10-228688 has a tooth row of dog teeth in which the respective engagement elements are arranged in the circumferential direction, and each dog tooth is inclined in the circumferential direction. The dog teeth have a triangular (tapered) tip. Further, Patent Document 2 also shows a dog tooth having a two-step tapered surface with a large inclination angle on the tip side. The tips of the dog teeth are triangular. Note that the dog clutch of Patent Document 1 shifts the planetary gear mechanism to an overdrive state by stopping the rotation of the sun roller of the planetary gear mechanism to which the engine and the rotating machine are connected in a hybrid vehicle. The dog clutch of Patent Document 2 is used to stop the rotation of one of the rotating machines in a hybrid vehicle having a planetary gear mechanism in which an engine and two rotating machines are connected.

JP 2009-133350 A International Publication No. 2010/122664

  By the way, in the dog clutch, there is a possibility that the tip of the dog tooth collides at the time of engagement and generates an impact. In particular, a dog tooth shape having a top surface such as a trapezoidal shape is conceivable. However, a dog tooth having such a top surface collides with the top surface when engaged and generates a large impact. there is a possibility. For this reason, the dog clutch is required to have a large physique and a high-strength material so that it can withstand the impact load, which may increase the cost. Further, in the dog clutch, there is a possibility that an undesirable torque is generated with respect to the rotating body to be engaged due to the impact at the time of engagement. For this reason, the dog clutch is required to have a complicated structure and mechanism for suppressing the torque, which may increase the cost. Further, in the dog clutch, when the meshing depth at the time of engagement is short, the generated stress may be increased.

  Accordingly, an object of the present invention is to provide a dog clutch that can improve the disadvantages of the conventional example and can be engaged with less impact.

  In order to achieve the above object, the present invention provides an annular first engagement element capable of reciprocating in the axial direction and an annular second engagement meshing with the first engagement element moved in the axial direction. A combination element, a circumferential tooth row composed of a plurality of teeth provided on at least one of the first engagement element and the second engagement element, the first engagement element, and the second engagement A cylindrical or columnar holding member formed with a circumferential surface for holding one of the elements, and an axial direction formed between the holding member and the engaging element held by the holding member The teeth forming the dentition are formed so that a portion facing the other engaging element in the axial direction is a top surface perpendicular to the axial direction, and the spline Increases the engagement depth when the first engagement element and the second engagement element are engaged with each other. It is characterized by having a twist angle of the direction.

  Here, it is desirable that the tooth row is provided on both the first engagement element and the second engagement element, and the teeth of each tooth row are formed as trapezoidal teeth whose upper base forms the top surface.

  In addition, it is desirable to provide an elastic member that absorbs an impact in the axial direction when the first engagement element and the second engagement element are engaged with each other.

  The twist angle of the spline is such that when the first engagement element and the second engagement element are engaged with each other, the first engagement element and the second engagement element are at least on the top surfaces of each other. It is desirable to form it so that it can be rotated relative to the sum of the circumferential widths.

  The dog clutch according to the present invention can release the engagement element held by the holding member in the axial direction by the action of the spline when the meshing surfaces of the respective teeth come into contact with each other. The accompanying impact can be suppressed. The axial displacement of the engaging element can be absorbed by providing an elastic member at the tip of the axial direction. In addition, when the top surfaces of the respective teeth collide, the engagement element held by the holding member can be rotated by the action of the spline, so that the possibility of the top surface being stopped can be suppressed. it can.

FIG. 1 is a schematic diagram illustrating the configuration of a dog clutch according to the present invention. FIG. 2 is a cross-sectional view of a tooth cut along line AA in FIG. FIG. 3 is a diagram for explaining the movement when the meshing surfaces of the teeth come into contact with each other. FIG. 4 is a diagram for explaining the movement when the top surfaces of the teeth come into contact with each other. FIG. 5 is a schematic diagram illustrating a configuration of a modified example of the dog clutch according to the present invention.

  Embodiments of a dog clutch according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to the embodiments.

  The dog clutch includes an annular first engaging element that can reciprocate in an axial direction, an annular second engaging element that meshes with the first engaging element that has moved in the axial direction, and the first clutch An engagement element and a circumferential tooth row provided on at least one of the second engagement elements. The dog clutch includes a cylindrical or columnar holding member formed with a circumferential surface that holds one of the first engaging element and the second engaging element, the holding member, and the holding member. And a spiral spline centered on the axial direction formed between the engagement elements held by the first and second engagement elements. In this dog clutch, the teeth forming the tooth row are formed such that a portion facing the other engaging element in the axial direction is a top surface perpendicular to the axial direction. In the dog clutch, the spline has a twist angle in a direction in which the engagement depth increases when the first engagement element and the second engagement element are engaged with each other.

[Example]
An embodiment of a dog clutch according to the present invention will be described with reference to FIGS.

  Reference numeral 1 in FIG. 1 indicates a dog clutch of this embodiment. The dog clutch 1 includes an annular first engaging element 10 that can reciprocate in the axial direction, an annular second engaging element 20 that meshes with the first engaging element 10 that has moved in the axial direction, Is provided.

  The first engagement element 10 includes an annular base portion 11 and a plurality of teeth 12 forming a circumferential tooth row provided on the inner peripheral surface of the base portion 11. Each tooth 12 is erected from the inner peripheral surface of the base 11 toward the radially inner side. Further, the respective teeth 12 are arranged at substantially equal intervals in the circumferential direction on the inner peripheral surface of the base portion 11.

  As shown in FIG. 2, the tooth 12 is formed such that a portion facing the second engagement element 20 in the axial direction is a surface (hereinafter referred to as “top surface”) 12 a perpendicular to the axial direction. To do. FIG. 2 is a cross-sectional view of the tooth 12 and a later-described tooth 22 taken along line AA in FIG. 1, and corresponds to a view of the teeth 12 and 22 viewed in the radial direction. For example, the teeth 12 are formed so that the cross section perpendicular to the radial direction has a trapezoidal shape with the upper base as a portion of the top surface 12a. That is, as the tooth 12, a trapezoidal tooth whose upper base forms the top surface 12a may be used.

  The first engagement element 10 reciprocates in the axial direction by an actuator (not shown) controlled by, for example, an electronic control device of the vehicle (arrow X). The illustrated first engagement element 10 is not rotated about its central axis (rotation shaft 91 described later), but may be such rotation.

  On the other hand, the second engagement element 20 includes an annular base 21 and a plurality of teeth 22 forming a circumferential tooth row provided on the outer peripheral surface of the base 21. Each tooth 22 is erected from the outer peripheral surface of the base 21 toward the radially outer side. Further, the respective teeth 22 are arranged on the outer peripheral surface of the base portion 21 at substantially equal intervals in the circumferential direction.

  As shown in FIG. 2, the tooth 22 is formed such that a portion facing the first engagement element 10 in the axial direction becomes a surface (hereinafter referred to as “top surface”) 22 a perpendicular to the axial direction. To do. For example, the teeth 22 are formed so that the cross section perpendicular to the radial direction has a trapezoidal shape with the upper base as a portion of the top surface 22a. That is, as this tooth 22, a trapezoidal tooth whose upper base forms the top surface 22a may be used.

  The respective tooth rows of the first engagement element 10 and the second engagement element 20 are determined in number, interval, and shape so that the teeth 12 and the teeth 22 are alternately engaged with each other. The teeth 12 and 22 have meshing surfaces 12b and 22b with which one end surfaces in the circumferential direction abut against each other. Further, the respective teeth 12 and 22 are formed with first chamfered portions 12c and 22c and second chamfered portions 12d and 22d which may contact each other (FIG. 2). The first chamfered portion 12c is a portion that connects the top surface 12a and the surface opposite to the meshing surface 12b. Similarly, the first chamfered portion 22c is a portion that connects the top surface 22a and the surface opposite to the meshing surface 22b. The second chamfered portion 12d is a portion that connects the top surface 12a and the meshing surface 12b. Similarly, the second chamfered portion 22d is a portion that connects the top surface 22a and the meshing surface 22b.

  The second engagement element 20 is held by the holding member 30. The holding member 30 is cylindrical or columnar in which a circumferential surface that holds the second engagement element 20 is formed. The second engaging element 20 is held by the holding member 30 by inserting a concentric holding member 30 into a cylindrical space formed by the inner peripheral surface thereof.

  Here, the second engagement element 20 is attached to the holding member 30 so as to be capable of relative rotation with respect to the holding member 30 and relative movement in the axial direction. For this purpose, a spiral spline (so-called helical spline) 31 centering on the axial direction is formed between the second engagement element 20 and the holding member 30. The spline 31 is configured by spiral grooves formed on the inner peripheral surface of the second engagement element 20 and the outer peripheral surface of the holding member 30. Therefore, the second engagement element 20 can relatively move in the axial direction while rotating relative to the holding member 30. The spline 31 is configured such that when the first engagement element 10 is moved toward the second engagement element 20 and the teeth 12 and the teeth 22 are engaged with each other, the engagement depth is increased. Therefore, the spline 31 has a twist angle in a direction (arrow X1 in FIG. 3) in which the engagement depth increases when the first engagement element 10 and the second engagement element 20 are engaged with each other.

  In the dog clutch 1, the second engagement element 20 is moved relative to the second engagement element 20 so that the axial position of the second engagement element 20 relative to the holding member 30 can be returned to the neutral position (that is, the reference position before the relative movement). Elastic members 41 and 42 for applying elastic force are provided. The elastic member 41 is disposed between one annular end surface in the axial direction of the second engagement element 20 (specifically, the base portion 21) and an annular end surface of the rotating body 90 described later, and the second engagement element When 20 is in the neutral position, an elastic force is applied to each end face. The elastic member 42 is disposed between the other annular end surface in the axial direction of the second engagement element 20 (specifically, the base portion 21) and the annular end surface of the snap ring 43, and the second engagement element 20 In the neutral position, a resilient force is applied to each end face.

  The holding member 30 is fixed to the rotating body 90 with its central axis coinciding with the rotating shaft 91. Therefore, the holding member 30 can be rotated together with the rotating body 90 together with the second engagement element 20 in the direction of the arrow R in FIG. The rotating body 90 is not limited to this, and for example, an output shaft of a power source in a vehicle, an output shaft of a transmission, or the like can be considered.

  In the dog clutch 1, when the first engagement element 10 is brought close to the second engagement element 20 (arrow X1 in FIG. 3), the top surface 12a of the tooth 12 collides with the top surface 22a of the tooth 22. Instead, the teeth 12 may enter between adjacent teeth 22 (upper view in FIG. 3). At that time, since the second engagement element 20 rotates together with the rotating body 90 and the holding member 30, the meshing surface 22 b of the tooth 22 contacts the meshing surface 12 b of the tooth 12.

  In the dog clutch 1, the impact torque accompanying the contact is converted by the spline 31 into an axial force (axial force). 3 indicates the direction of impact torque applied to the second engagement element 20. Then, the second engagement element 20 relatively moves in the axial direction while slightly rotating relative to the holding member 30 by the axial force. The relative rotation direction is opposite to the rotation direction by the rotating body 90. For this reason, the second engagement element 20 relatively moves in a direction away from the rotating body 90 (arrow Y1 in the upper diagram of FIG. 3). That is, in the dog clutch 1, the second engagement element 20 can be released in the axial direction by the action of the spline 31, so that an impact caused by the contact can be suppressed. Further, the displacement of the second engagement element 20 in the axial direction due to the impact torque at the time of meshing is absorbed by the elastic member 42. Therefore, at the time of such engagement, the inertia related to the rotation of the second engagement element 20 rotating together with the rotating body 90 or the like is reduced.

  Torque associated with the rotation of the rotating body 90 is applied to the second engagement element 20 even while the axial displacement is occurring. Therefore, the rotation of the second engagement element 20 stops with the contact of the meshing surface 22b with the meshing surface 12b. However, since the rotating body 90 still continues to rotate, the second engaging element 20 generates an axial force in the direction in which the meshing depth increases (arrow Y1 in the lower diagram of FIG. 3) due to the action of the spline 31. . Therefore, in the dog clutch 1, the first engagement element 10 is pushed into the second engagement element 20, and the second engagement element 20 rotates relative to the holding member 30 in the reverse direction (arrow Y1). Move relative to. Therefore, the dog clutch 1 can increase the meshing depth.

  Note that the relative movement of the second engagement element 20 in the direction of the arrow Y1 is caused by the position where the second engagement element 20 cannot rotate relative to each other (for example, the relative rotation of the second engagement element 20 by the elastic member 42 or the snap ring 43). It ends when it moves to the position where it is blocked. At that time, the rotation of the rotating body 90 stops. When the first engagement element 10 is moved to release the meshing engagement state, the second engagement element 20 starts to rotate with the rotating body 90 and the like, and is returned to the neutral position by the elastic member 42.

  In this manner, the dog clutch 1 can increase the meshing depth while lowering the rotational speed of the second engagement element 20 by the spline 31 when the meshing surface 22b comes into contact with the meshing surface 12b. . Therefore, in the dog clutch 1, it is possible to reduce the inertia related to the rotation of the second engagement element 20 and to secure the contact area between the meshing surfaces 12b and 22b. The pressure can be greatly reduced.

  Further, in the dog clutch 1, when the first engagement element 10 is brought close to the second engagement element 20 (arrow X1 in FIG. 4), the top surface 12a of the tooth 12 becomes the top surface 22a of the tooth 22. There may be a collision (upper figure in FIG. 4). The impact load accompanying the top surface collision is absorbed by the elastic member 41.

  The second engagement element 20 is pushed by the first engagement element 10 toward the rotating body 90 (in the direction of the arrow Y2 in the lower diagram of FIG. 4) with the top surface collision. For this reason, the second engagement element 20 moves relative to the holding member 30 in the direction of the arrow Y2 while rotating relative to the holding member 30 in the same direction as the rotation direction of the rotating body 90 by the action of the spline 31. Therefore, in the dog clutch 1, even when the top surfaces 12a and 22a collide with each other during the meshing engagement, the first engagement element 10 and the second engagement element 20 are stopped in the state at the time of the collision. (So-called top surface stop) can be suppressed.

  Here, in the dog clutch 1, the second engagement element 20 is further rotated relative to the state shown in the lower diagram of FIG. 4, and the teeth 12 of the first engagement element 10 are positioned between the teeth 22 of the second engagement element 20. To insert. That is, the dog clutch 1 shifts to the above-described state of FIG. 3 and engages and engages the first engagement element 10 and the second engagement element 20. Therefore, in the dog clutch 1, when the first engagement element 10 and the second engagement element 20 are engaged, the first engagement element 10 and the second engagement element 20 are at least the top surfaces 12a and 12a, The twist angle of the spline 31 is formed so that it can be rotated relative to the sum of the circumferential widths W1 and W2 at 22a.

  Further, in the dog clutch 1, when the first engagement element 10 is brought close to the second engagement element 20 and the first chamfered portion 12c of the tooth 12 and the first chamfered portion 22c of the tooth 22 collide, Alternatively, even when the second chamfered portion 12d of the tooth 12 and the second chamfered portion 22d of the tooth 22 collide, the first engaging element 10 and the second engaging element 20 remain stopped at the time of the collision. It is desirable to avoid doing so. For this purpose, the twist angle of the spline 31 may be formed to be different from the chamfer angles of the first chamfered portions 12c and 22c and the second chamfered portions 12d and 22d. In this case, the chamfering angles of the first chamfered portions 12c and 22c are formed at the same angle, and the chamfered angles of the second chamfered portions 12d and 22d are formed at the same angle. Here, even when the first chamfered portions 12c and 22c collide with each other or when the second chamfered portions 12d and 22d collide with each other, the impact load is absorbed by the elastic member 41. The

  As described above, the dog clutch 1 can significantly reduce the collision surface pressure when the meshing surface 22b comes into contact with the meshing surface 12b. Further, the dog clutch 1 has an impact in any case where the top surfaces 12a and 22a collide, the first chamfered portions 12c and 22c collide, and the second chamfered portions 12d and 22d collide. The load can be absorbed by the elastic member 41. And when the top surfaces 12a and 22a collide, the possibility of the top surface being stopped by the action of the spline 31 can be suppressed. Therefore, the dog clutch 1 can suppress the occurrence of collision noise and vibration during meshing engagement and can improve drivability. Furthermore, since this dog clutch 1 can implement | achieve this effect with the simple structure as mentioned above, it becomes possible to suppress the increase in cost.

[Modification]
In this modification, in the dog clutch 1 of the embodiment, a holding member with a spline is provided not on the second engagement element side but on the first engagement element side. For this reason, the dog clutch of this modification can obtain the same effect as the dog clutch 1 of the embodiment. Below, the structure of the dog clutch of this modification is demonstrated based on FIG.

  The code | symbol 2 of FIG. 5 shows the dog clutch of this modification. The dog clutch 2 includes an annular first engaging element 110 that can reciprocate in the axial direction, and an annular or cylindrical second engaging element that meshes with the first engaging element 110 that has moved in the axial direction. 120.

  The first engaging element 110 has an annular base 111 corresponding to the base 11 and the teeth 12 in the first engaging element 10 of the embodiment and a plurality of teeth 112. Although not shown, the tooth 112 includes a top surface facing the second engagement element 120 in the axial direction, a meshing surface of a tooth 122 of the second engagement element 120 to be described later, and first and second chamfers. For example, formed as trapezoidal teeth.

  On the other hand, the second engagement element 120 has an annular base 121 and a plurality of teeth 122 corresponding to the base 21 and the teeth 22 in the second engagement element 20 of the embodiment. Although not shown, the tooth 122 includes a top surface facing the first engagement element 110 in the axial direction, a meshing surface with the tooth 112 of the first engagement element 110, and first and second chamfered portions. For example, it is formed as a trapezoidal tooth.

  In the present modification, the second engagement element 120 is fixed to the concentric rotator 90, and the second engagement element 120 is integrally rotated in accordance with the movement of the rotator 90. On the other hand, in this modified example, as described above, the holding member 130 is provided on the first engagement element 110 side.

  The holding member 130 has a cylindrical shape in which a circumferential surface for holding the first engagement element 110 is formed. The first engagement element 110 is held by being inserted into a cylindrical space formed by the inner peripheral surface of the concentric holding member 130.

  Instead of the second engagement element 20 of the embodiment, the first engagement element 110 is attached to the holding member 130 so that relative rotation with respect to the holding member 130 and relative movement in the axial direction are possible. Therefore, a spiral spline (helical spline) 131 centered in the axial direction is formed between the first engagement element 110 and the holding member 130. The spline 131 is configured by spiral grooves formed on the outer peripheral surface of the first engagement element 110 and the inner peripheral surface of the holding member 130, respectively. Therefore, the first engagement element 110 can relatively move in the axial direction while rotating relative to the holding member 130.

  The spline 131 is configured such that when the first engagement element 110 is moved toward the second engagement element 120 and the teeth 112 and the teeth 122 are engaged with each other, the engagement depth is increased. For this reason, the spline 131 has a twist angle in a direction in which the engagement depth increases when the first engagement element 110 and the second engagement element 120 are engaged with each other.

  In the dog clutch 2, when the first engagement element 110 and the second engagement element 120 mesh with each other, the first engagement element 110 and the second engagement element 120 are at least of the teeth 112 and 122 of each other. The twist angle of the spline 131 is formed so that the relative rotation can be performed more than the sum of the circumferential widths on the top surface.

  Also in this dog clutch 2, the twist angle of the spline 131 is such that the first chamfered portion of the teeth 112 and 122 does not stop while the first chamfered portions or the second chamfered portions of the teeth 112 and 122 collide with each other. And a size different from the chamfering angle of the second chamfered portion.

  The first engagement element 110 reciprocates in the axial direction together with the holding member 130 by, for example, an actuator (not shown) controlled by an electronic control device of the vehicle (arrow X). In this example, the holding member 130 is connected to the actuator via another holding member 135. The illustrated first engaging element 110 does not rotate integrally with the holding member 130 around the central axis (rotating shaft 91), but such rotation is performed. Also good.

  In the dog clutch 2, the first engagement element 110 is positioned relative to the first engagement element 110 so that the axial position of the first engagement element 110 with respect to the holding member 130 can be returned to the neutral position (that is, the reference position before the relative movement). Elastic members 141 and 142 for applying elastic force are provided. The elastic member 141 is disposed between one annular end surface in the axial direction of the first engaging element 110 (specifically, the base 111) and an annular standing surface directed radially inward of the holding member 135. When the first engagement element 110 is in the neutral position, a resilient force is applied to each end face thereof. The elastic member 142 is disposed between the other annular end surface in the axial direction of the first engagement element 110 (specifically, the base 111) and the annular end surface of the snap ring 143, and the first engagement element 110 is In the neutral position, a resilient force is applied to each end face.

  Also in the dog clutch 2, when the meshing surfaces of the teeth 112 and 122 are in contact with each other, the impact torque causes the first engagement element 110 to move in the axial direction (the engagement of the first engagement element 110 when meshing). Displacement in the direction of travel). That is, in the dog clutch 2, the first engagement element 110 can be released in the axial direction by the action of the spline 131, so that an impact caused by the contact can be suppressed. Also, in the dog clutch 2, the displacement is absorbed by the elastic member 142.

  Torque associated with the rotation of the rotating body 90 is applied to the second engagement element 120 even after the meshing surfaces come into contact with each other. For this reason, the first engaging element 110 generates an axial force in the direction in which the meshing depth increases due to the action of the spline 131. Accordingly, in the dog clutch 2, the first engagement element 110 is pushed into the second engagement element 120 by the actuator, and further, the first engagement element 110 is pushed into the second engagement element 120 by the action of the spline 131. Therefore, the meshing depth can be increased.

  The relative movement in the axial direction of the first engagement element 110 with respect to the holding member 130 by the action of the spline 131 is a position where the first engagement element 110 cannot rotate relative to the holding member 130 (for example, the elastic member 142 or It ends when the snap ring 143 moves to the position where the relative rotation of the first engagement element 110 is hindered. At that time, the rotation of the rotating body 90 stops. When the first engagement element 110 is moved so as to release the meshing engagement state, the second engagement element 120 starts to rotate together with the rotating body 90 or the like, and the first engagement element 110 is elastic member 142. Is returned to the neutral position.

  In the dog clutch 2, the top surfaces of the teeth 112 and 122 may come into contact with each other, but the impact load accompanying the top surface collision is absorbed by the elastic member 141.

  The 1st engagement element 110 is pushed in the elastic member 141 side by the 2nd engagement element 120 with the top surface collision. For this reason, the first engagement element 110 moves relative to the elastic member 141 while rotating relative to the holding member 130 by the action of the spline 131. Therefore, in the dog clutch 2, even if the top surfaces collide when performing meshing engagement, the top surface stop between the first engagement element 110 and the second engagement element 120 can be suppressed. .

1, 2 Dog clutch 10, 110 First engagement element 11, 21, 111, 121 Base 12, 22, 112, 122 Teeth 12a, 22a Top surface 12b, 22b Engaging surface 12c, 22c First chamfered portion 12d, 22d First Two chamfered portions 20, 120 Second engaging element 30, 130 Holding member 31, 131 Spline 41, 42, 141, 142 Elastic member 90 Rotating body

Claims (4)

An annular first engaging element capable of reciprocating in the axial direction;
An annular second engaging element meshing with the first engaging element that has moved in the axial direction;
A circumferential row of teeth comprising a plurality of teeth provided on at least one of the first engagement element and the second engagement element;
A cylindrical or columnar holding member formed with a circumferential surface for holding one of the first engaging element and the second engaging element;
A spiral spline centered on the axial direction formed between the holding member and an engagement element held by the holding member;
With
The teeth forming the dentition are formed so that the portion facing the other engagement element in the axial direction is a top surface perpendicular to the axial direction,
The dog clutch according to claim 1, wherein the spline has a twist angle in a direction in which an engagement depth increases when the first engagement element and the second engagement element are engaged with each other.   The tooth row is provided on both the first engagement element and the second engagement element, and the teeth of each tooth row are formed as trapezoidal teeth whose upper base forms the top surface. The dog clutch according to 1.   The dog clutch according to claim 1 or 2, further comprising an elastic member that absorbs an impact when the first engagement element and the second engagement element mesh with each other in an axial direction.   The twist angle of the spline is such that when the first engagement element and the second engagement element are engaged with each other, the first engagement element and the second engagement element are at least circumferential in the top surface of each other. The dog clutch according to claim 1, 2 or 3, wherein the dog clutch is formed so as to be able to rotate relative to a total value of the widths of the two.

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