JP2022157289A - Engagement clutch device and power transmission device - Google Patents

Abstract

To provide an engagement clutch device which can be reduced in size, and a power transmission device.SOLUTION: An engagement/disengagement mechanism 11 has: a shift drum 13 which rotates to a second position from a first position; and a coil spring 18 for absorbing the drive of an electric motor 12 by an elastic deformation when the movement of a selector sleeve 55 to a first direction D1 is stopped by the drive of the electric motor 12. When the shift drum 13 is at the first position, an inner spline 55s and an outer spline 51s are in an engagement-released state where the engagement is released, and when the shift drum 13 is at the second position, the inner spline 55s and the outer spline 51s are in an engagement state and in a restriction state where the selector valve 55 is restricted from moving to the first direction D1 by a first stopper 21. The selector sleeve 55 presses the first stopper 21 by an elastic deformation of the coil spring 18.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present disclosure relates to a dog clutch device mounted on a vehicle such as an automobile, and a power transmission device having the same.

2. Description of the Related Art Conventionally, as a power transmission device suitable for use in a vehicle, for example, a stepped transmission mechanism having a dog clutch device and forming a plurality of gear stages by engaging and disengaging the dog clutch is known (Patent Document 1). reference). In this stepped transmission mechanism, the dog clutch device has a dog clutch (for example, a dog clutch) and an engagement/disengagement mechanism that engages and disengages the dog clutch. The engagement/disengagement mechanism has an electric motor as an actuator, a shift drum rotationally driven by the electric motor, a cam mechanism, a shift fork, and the like. An electric motor rotates a shift drum, axially moves a shift fork through a cam mechanism, and axially moves a sleeve on which one tooth of the dog clutch is formed, thereby disengaging the dog clutch. I have to.

In addition, assuming that when the sleeve is moved in the axial direction to engage the dog clutch, the tips of the teeth may come into contact with each other in the axial direction, causing an uplock in which the sleeve cannot move any further. A torsion coil spring is interposed between the electric motor and the shift drum. As a result, when an uplock occurs, the rotation is absorbed by the torsion coil spring without stopping the electric motor, and by shifting the phase of the dog clutch, the torsion coil spring is released and the dog clutch can be engaged. can.

JP 2009-180342 A

In the dog clutch device disclosed in Patent Document 1, the gear clutch starts to engage while the shift drum is rotating and the shift fork is moving, and then the shift fork is moved to ensure the engagement state of the dog clutch. do. However, in order to secure a meshed state while taking into consideration looseness and the like on the power transmission path from the shift drum to the sleeve, it is necessary to secure a sufficient axial meshing length between the teeth of the dog clutch. For this reason, the axial dimension of the dog clutch and the axial dimension of the shift drum for moving the sleeve are increased, which may increase the size of the dog clutch device. It has not been.

Therefore, it is an object of the present invention to provide a dog clutch device and a power transmission device that can be made compact.

A meshing clutch device according to the present disclosure includes a meshing clutch having first teeth and second teeth, and capable of engaging and disengaging the first teeth and the second teeth, and an engagement/disengagement mechanism that engages/disengages the teeth. , wherein the engagement/disengagement mechanism includes an actuator, a shift drum rotated from a first position to a second position by a driving force output from the actuator, a shift fork moved by rotation of the shift drum, and the A sleeve that is integrated with one protruded tooth, is provided rotatably about a rotation center axis, and moves in the axial direction of the rotation center axis by the shift fork, and is interposed in a power transmission path from the actuator to the sleeve, When the axial tip of the first protruded tooth and the axial tip of the second protruded tooth come into contact with each other and the sleeve stops moving in one direction in the axial direction due to the driving of the actuator, elastic deformation occurs. and a stopper that restricts movement of the sleeve in one of the axial directions in a meshed state where the first tooth and the second tooth are meshed, When the shift drum is at the first position, the first teeth and the second teeth are in a disengaged state, and when the shift drum is at the second position, the first teeth are in a disengaged state. The protruded tooth and the second protruded tooth are in the meshing state, and the movement of the sleeve in one of the axial directions is restricted by the stopper. A sleeve or the shift fork presses against the stopper.

A power transmission device according to the present disclosure includes an input member drivingly connected to a drive source, an output member drivingly connected to a wheel, and the dog clutch interposed in a power transmission path from the input member to the output member. and a device for forming a shift stage and outputting the rotation input to the input member from the output member when the dog clutch device is engaged.

According to this dog clutch device and power transmission device, size reduction can be achieved.

1A is a schematic diagram showing the skeleton of the vehicle drive system according to the embodiment, FIG. 1B is a schematic diagram showing the first clutch in a disengaged state, and FIG. 1C is a schematic diagram showing the first clutch in an engaged state; 1 is a schematic diagram showing FIG. 1A and 1B are schematic diagrams showing a dog clutch device according to an embodiment, in which (a) is when the rotation position of a shift drum is at the first position, and (b) is when tips of teeth of the first clutch are in contact with each other; . 1A and 1B are schematic diagrams showing a dog clutch device according to an embodiment, where (a) is when the rotational position of the shift drum is the engagement confirmation position, and (b) is when the rotational position of the shift drum is the third position; 1A and 1B are schematic diagrams showing a dog clutch device according to an embodiment, in which (a) is when the rotational position of the shift drum is the second position, and (b) is when the rotational position of the shift drum is the fourth position;

An embodiment according to the present disclosure will be described below with reference to FIGS. 1(a) to 4(b). First, a hybrid vehicle 1, which is an example of a vehicle equipped with a vehicle drive system 2 according to the present embodiment, will be described with reference to FIG. 1(a). In this embodiment, the hybrid vehicle 1 is of a so-called FF (front engine/front drive) type. However, the hybrid vehicle 1 is not limited to the FF type, and may be the FR (front engine/rear drive) type. Drive connection refers to a state in which the rotating elements are connected to each other so as to be able to transmit driving force. It is used as a concept that includes a state in which the driving force is connected to each other.

[Schematic Configuration of Vehicle Drive System]
The hybrid vehicle 1 generally includes a control unit (ECU) 5 capable of controlling each part of the vehicle drive device 2, an engine 20 as an example of a drive source, the vehicle drive device 2 as a hybrid drive device, and the Front wheels 70, which are left and right wheels drivingly connected to the vehicle drive device 2 via left and right drive shafts 63, and a hybrid battery unit (not shown) capable of storing electric power of the vehicle drive device 2 (hereinafter simply referred to as "battery ), and

The vehicle drive device 2 includes a transmission 4 that is drivingly connected to an engine 20, and an electric motor (hereinafter simply referred to as "motor") 40 that is a motor generator (MG1) that is an example of a drive source. there is The motor 40 includes a stator 41 fixed to a case (not shown) and a rotor 42 powered or regenerated by the stator 41. A rotor shaft 42a of the rotor 42 is drivingly connected to a motor gear train 45 of the transmission 4. It is The motor gear train 45 has an output gear 43 fixed to the rotor shaft 42a and an idler gear 44 meshing with the output gear 43. The idler gear 44 is a first gear drivingly connected to a ring gear R of a planetary gear PR, which will be described later. It meshes with the counter gear 94 .

The transmission 4 roughly includes a damper device 90, an engine disconnecting clutch K0, an on-disconnect clutch 95, and a planetary gear PR coaxially with the output shaft 20a of the engine 20. It comprises a motor gear train 45 , a counter gear portion 46 and a differential device 60 .

The damper device 90 is drivingly connected to the output shaft 20 a of the engine 20 and transmits the rotation of the engine 20 to the input shaft 91 while absorbing the explosive vibration of the engine 20 . When the engine disconnect clutch K0 is engaged, the input shaft 91 and the intermediate shaft 92 are drivingly connected to each other, and the rotation of the engine 20 is transmitted to the intermediate shaft 92. detach the The intermediate shaft 92 is an example of an input member, and is drivingly connected to the sun gear S of the planetary gear PR.

The planetary gear PR is composed of a single pinion planetary gear having a sun gear S, a ring gear R, and a carrier CR rotatably supporting a pinion P meshing with the sun gear S and ring gear R. Among them, the sun gear S is drivingly connected to the engine 20 via the intermediate shaft 92, the engine disconnecting clutch K0, and the damper device 90 as described above. Also, the ring gear R is drivingly connected to the first counter gear 94 and is drivingly connected to the motor 40 via the motor gear train 45 . Further, the carrier CR is drivingly connected to a second counter gear 93 having a diameter smaller than that of the first counter gear 94 . The contact/disengage clutch 95 is a meshing clutch, and is configured to slide axially on the outer periphery of the gear CRG drivingly connected to the carrier CR so as to mesh with the gear RG drivingly connected to the ring gear R. In other words, the carrier CR and the ring gear R are configured to be engaged with each other. The connection/disengagement clutch 95 is not limited to one that engages the ring gear R and the carrier CR, and may be configured to engage any two of the sun gear S, the carrier CR, and the ring gear R.

The counter gear portion 46 includes a counter shaft 50 , a fixed gear 54 , a first driven gear 51 , a second driven gear 52 , a dog clutch device 10 and an output gear 53 . The fixed gear 54 is drivingly connected to the counter shaft 50 so as to be non-rotatable and non-movable in the axial direction. The dog clutch device 10 has a first clutch C1, a second clutch C2, and an engagement/disengagement mechanism 11 that engages/disengages the first clutch C1 and the second clutch C2. A detailed configuration of the dog clutch device 10 will be described later.

The second driven gear 52 is rotatably supported with respect to the counter shaft 50 and meshed with the second counter gear 93, that is, constitutes a reduction gear for reducing the rotation of the carrier CR. The first driven gear 51 is similarly rotatably supported with respect to the counter shaft 50 , is formed to have a diameter smaller than that of the second driven gear 52 , and meshes with the first counter gear 94 . On the other hand, an output gear 53 as an output member is drivingly connected to the counter shaft 50 and meshes with a differential ring gear 61 of a differential device 60 which will be described later.

The meshing clutch device 10 slides the switching sleeve 55 in the axial direction by means of the engagement/disengagement mechanism 11 and moves to a position where it meshes with the outer spline 52s drivingly connected to the second driven gear 52. gear), and moves to a position where it meshes with the outer spline 51s drivingly connected to the first driven gear 51, thereby forming the Hi state (second gear). Configure. It can be said that the first clutch C<b>1 and the second clutch C<b>2 are interposed between the motor 40 and the output gear 53 .

The differential device 60 includes a differential ring gear 61, pinion gears 62P1 and 62P2 drivingly connected to the differential ring gear 61, and side gears 62SL and 62SR meshed with the pinion gears 62P1 and 62P2 and drivingly connected to the left and right drive shafts 63, respectively. , and is configured to transmit the rotation of the differential ring gear 61 to the left and right drive shafts 63 and the front wheels 70 while absorbing the differential rotation of the side gears 62SL and 62SR.

[Configuration of dog clutch device]
Next, the configuration of the dog clutch device 10 will be described in detail. The dog clutch device 10 can engage and disengage a first clutch C1, which is an example of a dog clutch and a first dog clutch, a second clutch C2, which is an example of a second dog clutch, and the first clutch C1 and the second clutch C2. and an engagement/disengagement mechanism 11 for The first clutch C1 is an example of an outer spline 54s provided on the outer peripheral portion of the fixed gear 54 so as to rotate integrally with the counter shaft 50, and second teeth formed on the first driven gear 51 adjacent to the outer spline 54s. An outer spline 51s and an inner spline 55s, which is an example of a first protruded tooth provided on the inner peripheral side of a switching sleeve 55 described later, are provided. The second clutch C2 includes the above-described outer spline 54s, the outer spline 52s that is an example of the fourth tooth formed on the second driven gear 52 adjacent to the outer spline 54s, and the above-described inner spline that is an example of the third tooth. and a spline 55s. The outer splines 51s, 52s, and 54s have the same outer diameter.

The switching sleeve 55 is sleeve-shaped, has an inner spline 55s that can be engaged with each of the outer splines 51s, 52s, and 54s on its inner peripheral portion, and is axially movable with respect to the outer splines 51s, 52s, and 54s. ing. In this embodiment, the first clutch C1 and the second clutch C2 share the outer spline 54s and the inner spline 55s. However, the present invention is not limited to this, and the first protruded tooth of the first clutch C1 and the third protruded tooth of the second clutch C2 may be formed separately.

As shown in FIG. 1B, the outer spline 51s formed on the first driven gear 51 has a plurality of spline teeth 51t provided in parallel along the axial direction. Each spline tooth 51t has a distal end portion 51e that is inclined, for example, by about 45° with respect to the axial direction. In addition, the inner spline 55s formed on the switching sleeve 55 has a plurality of spline teeth 55t provided in parallel along the axial direction. Each spline tooth 55t has a distal end portion 55e that is inclined, for example, by about 45° with respect to the axial direction. When the outer spline 51s and the inner spline 55s are switched from the disengaged state shown in FIG. 1B to the engaged state shown in FIG. , the tips 55e of the spline teeth 55t enter and mesh with the spline teeth 51t. In the present embodiment, the position where the meshing of the spline teeth 51t and the spline teeth 55t is completed by the engagement/disengagement mechanism 11 (the state shown in FIG. 1(c)) is defined as the engagement completion position. Although not shown, the relationship between the outer spline 52s and the inner spline 55s formed on the second driven gear 52 is similarly configured. That is, the engaging/disengaging mechanism 11 strokes at least one of the spline teeth 51t and the spline teeth 55t in the disengaging direction.

As a result, the switching sleeve 55 is moved to connect the counter shaft 50 and the first driven gear 51 to form the second gear (see FIG. 1(c)), and the counter shaft 50 and the second driven gear 52 are connected. It is possible to switch between three states: a state in which the gears are connected to form the first gear, and a neutral state (see FIG. 1(b)) as a disengaged state in which neither is connected.

In the first clutch C1, when the switching sleeve 55 is moved from the neutral state to the first driven gear 51 side, the inner spline 55s of the switching sleeve 55 straddles the outer spline 54s and the outer spline 51s of the first driven gear 51. When they are engaged, the switch sleeve 55 connects the counter shaft 50 and the first driven gear 51 to form a high-speed stage formation state. Thereby, the rotation of the intermediate shaft 92 is transmitted to the counter shaft 50 via the first counter gear 94 , the first driven gear 51 and the switching sleeve 55 .

In the second clutch C2, when the switching sleeve 55 is moved from the neutral state toward the second driven gear 52, the inner spline 55s of the switching sleeve 55 straddles the outer spline 54s and the outer spline 52s of the second driven gear 52. , and the switching sleeve 55 connects the counter shaft 50 and the second driven gear 52 to form a low speed step formation state. Thereby, the rotation of the intermediate shaft 92 is transmitted to the counter shaft 50 via the second counter gear 93 , the second driven gear 52 and the switching sleeve 55 .

That is, the first clutch C1 has spline teeth 51t drivingly connected to the intermediate shaft 92 and spline teeth 55t drivingly connected to the counter shaft 50. By disengaging the spline teeth 51t and the spline teeth 55t, the intermediate shaft The power transmission path between 92 and the counter shaft 50 is connected or disconnected. Further, in the second clutch C2, the gear ratio of each part is set so that the speed reduction is greater when the low-speed stage is formed than when the high-speed stage is formed.

Next, the engaging/disengaging mechanism 11 will be described with reference to FIG. 2(a). The engagement/disengagement mechanism 11 includes an electric motor 12 which is an example of an actuator, a shift drum 13 rotated by a driving force output from the electric motor 12, a pressing member 14 moved by the rotation of the shift drum 13, and a first auxiliary member. 15 and a second auxiliary member 16, a shift fork 17 that moves as the pressing member 14 moves, a switching sleeve 55, a coil spring 18 that is an example of an elastic member, and a first stopper 21 and a second stopper 22. is doing. When the electric motor 12 is driven, the shift drum 13, the pressing member 14, the first auxiliary member 15 and the second auxiliary member 16, the coil spring 18, and the shift fork 17 through the gear mechanism move the switching sleeve 55 in the axial direction. be done. That is, a power transmission path is formed from the electric motor 12 to the switching sleeve 55 . In this embodiment, the case where the electric motor 12 is applied as the actuator is described, but the present invention is not limited to this, and a hydraulic actuator may be applied.

The switching sleeve 55 is integrated with the inner spline 55s, is provided rotatably about the central axis of rotation, and is moved (stroked) by the shift fork 17 in the axial direction of the central axis of rotation. Regarding this axial direction, the direction toward the first driven gear 51 with respect to the switching sleeve 55 is defined as a first direction D1, which is one of the axial directions, and the direction toward the second driven gear is defined as a second direction D2, which is the other axial direction. .

The shift drum 13 has a cam groove 30, which is an example of a guide portion, provided on the outer peripheral portion. The cam groove 30 includes a neutral portion 33 along the circumferential direction, a first groove portion 31 arranged along the circumferential direction on the first direction D1 side of the neutral portion 33, and a circumferential portion on the second direction D2 side of the neutral portion 33. A second groove portion 32 arranged along the direction, a first inclined portion 34 communicating between the neutral portion 33 and the first groove portion 31, and a second inclined portion communicating between the neutral portion 33 and the second groove portion 32. and an inclined portion 35 . The pressing member 14 has a slider 14 a guided by the cam groove 30 , and the rotation of the shift drum 13 causes the slider 14 a to be guided along the cam groove 30 to move in the axial direction. It has become. The position of the shift drum 13 when the slider 14a is positioned in the neutral portion 33 is defined as the first position, and the position of the shift drum 13 when the slider 14a is positioned in the first groove portion 31 is defined as the second position. , the position of the shift drum 13 when the slider 14a is positioned in the second groove portion 32 is the fourth position. That is, the shift drum 13 is rotated from the first position to the second position by the driving force output from the electric motor 12 .

The pressing member 14 has a first pressing portion 141 provided on the first direction D1 side and a second pressing portion 142 provided on the second direction D2 side, and is provided movably in the axial direction. . The first pressing portion 141 can press the first end portion 181 of the coil spring 18 through the first auxiliary member 15 in the second direction D2. The second pressing portion 142 can press the second end portion 182 of the coil spring 18 through the second auxiliary member 16 in the first direction D1.

The shift fork 17 includes a shaft portion 170 along the axial direction, a fork portion 17a rotatably provided on the switching sleeve 55 and fixed in the axial direction, a first pressed portion 171, and a second pressed portion. and a portion 172, and is provided so as to be movable in the axial direction. The first pressed portion 171 and the second pressed portion 172 are configured by a snap ring or the like provided on the shaft portion 170 . The first pressed portion 171 can be pressed in the first direction D1 from the first end portion 181 of the coil spring 18 via the second end portion 152 of the first auxiliary member 15 . The second pressed portion 172 can be pressed in the second direction D2 from the second end portion 182 of the coil spring 18 via the first end portion 161 of the second auxiliary member 16 .

The first auxiliary member 15 has a first end 151 on the first direction D1 side and a second end 152 on the second direction D2 side, and is provided movably in the axial direction. The first end portion 151 can contact the first pressing portion 141 of the pressing member 14 in the first direction D1. The second end portion 152 can contact the first pressed portion 171 of the shift fork 17 on the first direction D1 side, and can contact the first end portion 181 of the coil spring 18 on the second direction D2 side. It's becoming As a result, the first pressed portion 171 of the shift fork 17 and the first end portion 181 of the coil spring 18 can be pressed via the second end portion 152 of the first auxiliary member 15 .

The second auxiliary member 16 has a first end 161 on the first direction D1 side and a second end 162 on the second direction D2 side, and is provided movably in the axial direction. The second end portion 162 can contact the second pressing portion 142 of the pressing member 14 in the second direction D2. The first end portion 161 can contact the second pressed portion 172 of the shift fork 17 on the second direction D2 side, and can contact the second end portion 182 of the coil spring 18 on the first direction D1 side. It's becoming As a result, the second pressed portion 172 of the shift fork 17 and the second end portion 182 of the coil spring 18 can be pressed via the first end portion 161 of the second auxiliary member 16 .

The coil spring 18 is a compression coil spring that expands and contracts in the axial direction, and has a first end 181 on the first direction D1 side and a second end 182 on the second direction D2 side. The coil spring 18 is attached to the shaft portion 170 of the shift fork 17 so as to be axially movable between the first pressed portion 171 and the second pressed portion 172 .

Here, in the present embodiment, the second end portion 152 of the first auxiliary member 15 in contact with the first pressed portion 171 of the shift fork 17 and the second end portion 152 in contact with the second pressed portion 172 of the shift fork 17 . 2 The distance between the auxiliary member 16 and the first end 161 is set to be equal to or less than the axial length (natural length) of the coil spring 18 . Also, the second end portion 152 of the first auxiliary member 15 contacts the first pressed portion 171 of the shift fork 17 , and the first end portion 161 of the second auxiliary member 16 contacts the second pressed portion 172 of the shift fork 17 . , the first end 151 of the first auxiliary member 15 contacts the first pressing portion 141 of the pressing member 14, and the second end 162 of the second auxiliary member 16 contacts the first pressing portion 141 of the pressing member 14. 2 is set to abut against the pressing portion 142 . As a result, even in a neutral state where no external force acts on the switching sleeve 55 from the first driven gear 51 and the second driven gear 52 , the coil spring 18 is positioned between the second end 152 of the first auxiliary member 15 and the second auxiliary member 16 . The first auxiliary member 15 and the second auxiliary member 16 are in contact with the pressing member 14 . Therefore, it is possible to prevent the shift fork 17 and the switching sleeve 55 from moving with play in the axial direction with respect to the pressing member 14 in the neutral state.

The first stopper 21, which is an example of a stopper, is provided in the case so as to face the end portion 17b of the shaft portion 170 of the shift fork 17 on the first direction D1 side. It sometimes restricts the movement of the shift fork 17 in the first direction D1. The first stopper 21 is in a first meshing state (engaging state, see FIGS. 3B and 4A) in which the inner spline 55s of the switching sleeve 55 and the outer spline 51s of the first driven gear 51 are meshed. Restricting movement of the fork 17 in the first direction D1 restricts movement of the switching sleeve 55 in the first direction D1.

The second stopper 22 is provided in the case so as to face the end portion 17c of the shaft portion 170 of the shift fork 17 on the second direction D2 side. movement in the second direction D2. The second stopper 22 moves the shift fork 17 in the second direction D2 in a second meshing state (see FIG. 4B) in which the inner spline 55s of the switching sleeve 55 and the outer spline 52s of the second driven gear 52 are meshed. Restricting the movement restricts the switching sleeve 55 from moving in the second direction D2.

[Operation of dog clutch device]
Next, the operation of the dog clutch device 10 will be described in detail. Since the engagement and disengagement of the first clutch C1 and the second clutch C2 are performed by the rotation of the shift drum 13, the rotation of the shift drum 13 will be described here. First, when the rotation position of the shift drum 13 is located at the first position, that is, when the slider 14a of the pressing member 14 is located at the neutral portion 33, as shown in FIG. C1 is in the first released state (released state), and the second clutch C2 is in the second released state. That is, when the shift drum 13 is at the first position, the first clutch C1 is released from engagement.

When the shift drum 13 rotates from the first position toward the second position and the slider 14a of the pressing member 14 is guided by the first inclined portion 34, the direction from the pressing member 14 to the switching sleeve 55 is in the first direction D1. move towards That is, the rotation of the shift drum 13 from the first position to the second position causes the pressing member 14 to move in the first direction D1 to press the second end 182 of the coil spring 18, thereby The portion 181 presses the shift fork 17 to move it in the first direction D1.

Here, due to the movement of the switching sleeve 55, as shown in FIG. may come into contact with each other. In this case, the shift fork 17 cannot move in the first direction D1. Since the first end 181 of the spring 18 cannot move in the first direction D1, the compression of the coil spring 18 absorbs the movement of the shift fork 17 . That is, the tip of the inner spline 55s on the first direction D1 side and the tip of the outer spline 51s of the first driven gear 51 on the second direction D2 side of the coil spring 18 are in contact with each other, and the electric motor 12 drives the switching sleeve 55. When the movement in the first direction D1 stops, the driving of the electric motor 12 is absorbed by elastic deformation. In this case, the switching sleeve 55 can be moved by slightly rotating the first driven gear 51 by driving the motor 3 , and the switching sleeve 55 is moved by the coil spring 18 .

On the other hand, when the shift drum 13 rotates from the first position to the second position, the pressing member 14 to the switching sleeve 55 move in the first direction D1, and the tips of the teeth do not come into contact with each other and stop. 3A, the tip of the inner spline 55s of the switching sleeve 55 on the first direction D1 side meshes with the tip of the outer spline 51s of the first driven gear 51. As shown in FIG. The rotational position of the shift drum 13 at this time is defined as the mesh confirmation position. Further, in the present embodiment, a position sensor detects the position of the shift fork 17 when the tip of the inner spline 55s of the switching sleeve 55 on the first direction D1 side meshes with the tip of the outer spline 51s of the first driven gear 51. is provided. Further, a rotational position sensor for detecting the rotational position of the shift drum 13 is provided. The ECU 5 engages the tip of the inner spline 55s of the switching sleeve 55 on the first direction D1 side with the tip of the outer spline 51s of the first driven gear 51 based on the detection information of the rotational position sensor and the detection information of the position sensor. determine whether it did.

When the shift drum 13 rotates from the engagement confirmation position toward the second position, and the slider 14a of the pressing member 14 is further guided by the first inclined portion 34, the shift fork 13 moves toward the second position as shown in FIG. 3(b). The first end portion 17b of the shaft portion 170 of 17 contacts the first stopper 21, and the movement of the shift fork 17 in the first direction D1 is restricted. At this time, the slider 14a of the pressing member 14 is positioned in the middle of the first inclined portion 34, and the rotational position of the shift drum 13 at this time is the third position. That is, when the shift drum 13 is at the third position while rotating from the first position to the second position, the inner spline 55s of the switching sleeve 55 and the outer spline 51s of the first driven gear 51 are in the first meshing state. In addition, the non-restricted state in which the switching sleeve 55 is not restricted by the first stopper 21 is switched to the first restricted state.

When the shift drum 13 rotates from the third position toward the second position, and the slider 14a of the pressing member 14 is further guided by the first inclined portion 34, the pressing member moves as shown in FIG. 14 slider 14a is located in the first groove portion 31, and the rotational position of the shift drum 13 is located at the second position. At this time, compared to when the shift drum 13 is at the third position, the pressing member 14 is moved in the first direction D1, but the movement of the shift fork 17 is restricted. Therefore, the second pressing portion 142 of the pressing member 14 presses the second end portion 182 of the coil spring 18 via the second auxiliary member 16, but the first end portion 181 of the coil spring 18 is directed in the first direction D1. Unable to move, the coil spring 18 is compressed. That is, when the shift drum 13 moves from the third position to the second position, the coil spring 18 is elastically deformed, and the switching sleeve 55 presses the first stopper 21 via the shift fork 17 . Thus, when the shift drum 13 is at the second position, the inner spline 55s of the switching sleeve 55 and the outer spline 51s of the first driven gear 51 are in the first meshing state, and the switching sleeve 55 is in the first stopper 21 position. In this state, the switching sleeve 55 presses the first stopper 21 due to elastic deformation of the coil spring 18 .

In this embodiment, when the slider 14a is positioned in the middle of the first inclined portion 34 of the cam groove 30 of the shift drum 13, the shift fork 17 comes into contact with the first stopper 21 and stops. On the other hand, for example, when a sufficient length of meshing between the teeth of the dog clutch in the axial direction is required to ensure the meshing state of the dog clutch as in the conventional art, the slider 14a is the cam of the shift drum 13. The shift fork 17 moves through the first inclined portion 34 of the groove 30 until it reaches the first groove portion 31 . As a result, according to the present embodiment, the amount of movement of the switching sleeve 55 is shortened compared to the case where a sufficient length of meshing between teeth of the dog clutch in the axial direction is ensured in order to ensure the meshing state of the dog clutch. Therefore, the length of the inner splines 55s and the outer splines 51s and the length of the shift drum 13 can be shortened, and the size of the dog clutch device 10 can be reduced.

Further, in the case where a sufficient length of meshing between the teeth of the dog clutch in the axial direction is taken in order to ensure the meshing state of the dog clutch, the teeth are not urged together in the engagement complete state, so that the vehicle is running. There was a possibility that gear slippage occurred. In contrast, in the present embodiment, when the first clutch C1 is in the fully engaged state, the teeth that mesh with each other are always biased by the coil spring 18, so it is possible to prevent the gear from slipping out during running.

The dimensions of each part are set so that the length of the coil spring 18 when the shift drum 13 is positioned at the second position is close to its natural length. As a result, when the shift drum 13 rotates from the third position to the second position, it is possible to prevent the drag force applied from the coil spring 18 to the rotation of the shift drum 13 from becoming excessively large.

Further, in the present embodiment, regarding the rotational speed of the shift drum 13, when the shift drum 13 is at the first position, the tip of the inner spline 55s of the switching sleeve 55 on the first direction D1 side is the tip of the outer spline 51s of the first driven gear 51. (including the case where the tips do not contact each other), the rotation speed is set high, and the rotation speed after that is set low. As a result, the rotational speed of the shift drum 13 can be slowed down when the shift drum 13 is positioned at the engagement confirmed position, the third position, and the second position, thereby suppressing the generation of noise due to the contact of the first clutch C1 and the first stopper 21. be able to.

On the other hand, when the shift drum 13 rotates from the first position toward the fourth position, it rotates in the opposite direction to when it moves from the first position to the second position, and the operation itself is the same. When the shift drum 13 rotates from the first position toward the fourth position and the slider 14a of the pressing member 14 is guided by the second inclined portion 35, the second end portion 17c of the shaft portion 170 of the shift fork 17 is moved. contacts the second stopper 22, and movement of the shift fork 17 in the second direction D2 is restricted. At this time, the slider 14a of the pressing member 14 is positioned in the middle of the second inclined portion 35, and the rotational position of the shift drum 13 at this time is the fifth position. That is, when the shift drum 13 is at the fifth position while rotating from the first position to the fourth position, the inner spline 55s of the switching sleeve 55 and the outer spline 52s of the second driven gear 52 are in the second meshing state. In addition, the non-restricted state in which the switching sleeve 55 is not restricted by the second stopper 22 is switched to the second restricted state.

When the shift drum 13 rotates from the fifth position toward the fourth position, and the slider 14a of the pressing member 14 is further guided by the second inclined portion 35, the pressing member moves toward the fourth position as shown in FIG. No. 14 slider 14a is located in the second groove portion 32, and the rotational position of the shift drum 13 is located at the fourth position. At this time, compared to when the shift drum 13 is at the fifth position, the pressing member 14 is moved in the second direction D2, but the movement of the shift fork 17 is restricted. Therefore, although the first pressing portion 141 of the pressing member 14 presses the first end portion 181 of the coil spring 18 via the first auxiliary member 15, the second end portion 182 of the coil spring 18 is directed in the second direction D2. Unable to move, the coil spring 18 is compressed. That is, when the shift drum 13 moves from the fifth position to the fourth position, the coil spring 18 is elastically deformed so that the switching sleeve 55 presses the second stopper 22 via the shift fork 17 . Thus, when the shift drum 13 is at the fourth position, the inner spline 55s of the switching sleeve 55 and the outer spline 52s of the second driven gear 52 are in the second meshing state, and the switching sleeve 55 is engaged with the second stopper 22. In this state, the switching sleeve 55 presses the second stopper 22 due to the elastic deformation of the coil spring 18 .

As described above, according to the dog clutch device 10 of the present embodiment, when the shift drum 13 is in the second position, the inner spline 55s of the switching sleeve 55 and the outer spline 51s of the first driven gear 51 are in the first mesh. and a first restriction state in which the movement of the switching sleeve 55 in the first direction D1 is restricted by the first stopper 21, and the switching sleeve 55 is moved to the first stopper by the elastic deformation of the coil spring 18. 21 is pressed. As a result, the amount of movement of the switching sleeve 55 can be shortened compared to the case where the meshing length of the teeth of the dog clutch in the axial direction is sufficiently long in order to ensure the meshing state of the dog clutch. The length of the splines 55s and the outer splines 51s and the length of the shift drum 13 can be shortened, and the size of the dog clutch device 10 can be reduced.

Further, according to the dog clutch device 10 of the present embodiment, the teeth that mesh with each other are always urged by the coil spring 18 when the engagement of the first clutch C1 is completed. can be done.

Further, according to the dog clutch device 10 of the present embodiment, the engagement/disengagement mechanism 11 is shared by the two clutches of the first clutch C1 and the second clutch C2, so an increase in the number of parts can be suppressed. can.

In the dog clutch device 10 of the present embodiment described above, the case where the shift fork 17 abuts against the first stopper 21 and the second stopper 22 to stop the movement of the switching sleeve 55 in the axial direction has been described. However, the movement of the switching sleeve 55 in the axial direction may be stopped by contact between the switching sleeve 55 and the first driven gear 51 and the second driven gear 52 . In this case, for example, the end surface of the switching sleeve 55 and the flange-like end surfaces provided on the first driven gear 51 and the second driven gear 52 are brought into contact with each other. In either case, it is preferable that there is no relative rotation between the abutting members.

Further, in the meshing clutch device 10 of the present embodiment, the case where the coil spring 18, which is an elastic member, is interposed between the pressing member 14 and the shift fork 17 has been described. A torsion coil spring interposed between the motor 12 and the shift drum 13 may be used.

Further, in the dog clutch device 10 of the present embodiment, the case where the dog clutch device 10 engages and disengages the two clutches of the first clutch C1 and the second clutch C2 has been described, but the present invention is not limited to this. Engagement and disengagement of one clutch may be performed.

In addition, in the dog clutch device 10 of the present embodiment, the case where the first clutch C1 in which the spline teeth mesh with each other has been described as an example of the first dog clutch. may apply. Further, in the vehicle drive system 2 of the present embodiment, the case where the dog clutch device 10 is applied to the transmission 4 has been described, but the present invention is not limited to this, and power transmission using a dog clutch that connects and disconnects the power transmission path is possible. It can be applied to mechanisms in general. Moreover, in the present embodiment, the case where the dog clutch device 10 is applied to the hybrid vehicle 1 has been described, but the present invention is not limited to this, and may be applied to an electric vehicle or a vehicle using only an engine as a drive source.

DESCRIPTION OF SYMBOLS 4... Transmission (power transmission device), 10... Mesh clutch apparatus, 11... Engagement/disengagement mechanism, 12... Electric motor (actuator), 13... Shift drum, 14... Pressing member, 14a... Slider, 17... Shift fork , 18... Coil spring (elastic member, compression coil spring) 20... Engine (driving source) 21... First stopper (stopper) 22... Second stopper 30... Cam groove (guide part) 34... First Inclined portion (inclined portion) 35 Second inclined portion (inclined portion) 40 Motor/generator (driving source) 50 Counter shaft 51s External spline (second tooth) 52s External spline (fourth tooth), 53... output gear (output member), 55... switching sleeve (sleeve), 55s... inner spline (first tooth, third tooth), 70... front wheel (wheel), 92... intermediate shaft (input member), 141 First pressing portion 142 Second pressing portion 171 First pressed portion 172 Second pressed portion 181 First end of elastic member 182 Second end of elastic member C1... First clutch (meshing clutch, first dog clutch), C2... Second clutch (second dog clutch), D1... First direction (one axial direction), D2... Second direction (other axial direction)

Claims (5)

a meshing clutch having first and second projecting teeth and capable of engaging and disengaging the first and second projecting teeth; and an engagement/disengagement mechanism for engaging/disengaging the meshing clutch,
The engagement/disengagement mechanism is
an actuator;
a shift drum rotated from a first position to a second position by a driving force output from the actuator;
a shift fork that moves as the shift drum rotates;
a sleeve integrated with the first protruded tooth, provided rotatably about a central axis of rotation, and moved in the axial direction of the central axis of rotation by the shift fork;
It is interposed in the power transmission path from the actuator to the sleeve, and the axial tip of the first tooth is in contact with the axial tip of the second tooth so that the sleeve is driven by the actuator. an elastic member that absorbs driving of the actuator by elastic deformation when movement in one direction stops;
a stopper that restricts movement of the sleeve in one of the axial directions in a meshed state in which the first tooth and the second tooth are meshed;
when the shift drum is at the first position, a disengaged state in which the first protruded tooth and the second protruded tooth are disengaged;
When the shift drum is at the second position, the first protruded tooth and the second protruded tooth are in the meshing state, and the sleeve is restricted from moving in one of the axial directions by the stopper. and the sleeve or the shift fork presses the stopper due to the elastic deformation of the elastic member.
dog clutch device; When the shift drum is at the third position during rotation from the first position to the second position, the first teeth and the second teeth are in the meshing state, and the sleeve is in the state of engagement. Switching from a non-restricted state in which the stopper is not regulated to the regulated state,
When the shift drum moves from the third position to the second position, the elastic member is elastically deformed so that the sleeve or the shift fork presses the stopper.
A dog clutch device according to claim 1. The engagement/disengagement mechanism has a pressing member provided between the shift drum and the shift fork in the power transmission path,
The shift drum has a guide portion provided on an outer peripheral portion,
The pressing member has a slider that is guided by the guide portion, and is moved in the axial direction by the inclined portion of the guide portion guiding the slider as the shift drum rotates,
The elastic member is a compression coil spring provided between the pressing member and the shift fork in the power transmission path and extending and contracting in the axial direction,
A first axial end of the elastic member contacts the shift fork, and a second axial end of the elastic member contacts the pressing member,
Rotation of the shift drum from the first position to the second position causes the pressing member to move in one of the axial directions to press the second end of the elastic member, thereby one end presses the shift fork to move it in one of the axial directions;
A dog clutch device according to claim 1 or 2. The dog clutch is a first dog clutch,
The stopper is a first stopper,
the released state is a first released state;
The meshing state is a first meshing state,
The regulated state is a first regulated state,
a third protruded tooth integrated with the sleeve; and a fourth protruded tooth arranged on the other side of the third protruded tooth in the axial direction, wherein the third protruded tooth and the fourth protruded tooth are detachable. , the third protruded tooth is moved in the other axial direction to engage with the fourth protruded tooth, and the third protruded tooth is disengaged from the fourth protruded tooth by moving in the one axial direction. comprising a second mesh clutch,
The engagement/disengagement mechanism has a second stopper that restricts movement of the sleeve in the other axial direction in a second meshing state in which the third tooth and the fourth tooth are meshed,
The pressing member has a first pressing portion that presses the first end and a second pressing portion that presses the second end,
The shift fork has a first pressed portion pressed by the first end and a second pressed portion pressed by the second end,
the shift drum is rotated from the first position to the fourth position by rotating in a direction opposite to a direction of rotation from the first position to the second position by a driving force output from the actuator;
a second disengaged state in which the third tooth and the fourth tooth are disengaged when the shift drum is at the first position;
When the shift drum is at the fourth position, a second meshing state is established in which the third tooth and the fourth tooth are meshed, and the sleeve is moved in the other axial direction by the second stopper. a second regulated state in which movement is regulated, and the sleeve or the shift fork presses the second stopper due to the elastic deformation of the elastic member;
By rotating the shift drum from the first position to the fourth position, the first pressing portion of the pressing member moves in the other axial direction to press the first end of the elastic member; the second end of the elastic member presses the second pressed portion of the shift fork to move it in the other axial direction;
A dog clutch device according to claim 3. an input member drivingly connected to a driving source;
an output member drivingly connected to the wheel;
and a dog clutch device according to any one of claims 1 to 4 interposed in a power transmission path from the input member to the output member,
When the dog clutch device is engaged, a shift stage is formed and the rotation input to the input member is output from the output member.
power transmission device.

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