JP2000304072A - Coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling with a sufficient torque capacity while improving the on-vehicle property by making it in a small size. SOLUTION: This coupling is provided with clutches 9 and 11 provided between a rotary case 5 and an inner shaft 7, an electric magnet 20 to connect and disconnect the clutch 11 by operating to move an armature 19 from the outer side of the rotary case 5, and a cam 15 to connect a main clutch 9 being operated by receiving the torque when the control clutch 11 is connected. In this case, a connecting shaft 21 and the case member 27 of the rotary case 5 are fastened together by a nut 23, and they are fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coupling intermittently operated by an electromagnet.

[0002]

2. Description of the Related Art A conventional coupling 201 is shown in FIG.

[0003] The coupling 201 is arranged in a rear-wheel-side power transmission system of a four-wheel drive vehicle, and connects and disconnects the rear wheels.

The coupling 201 is disposed at the front end (left side in FIG. 3) of a differential carrier for accommodating a rear differential, and includes a rotating case 203, an inner shaft 205, a multi-plate type main clutch 207 and a control clutch 2
09, a cam ring 211, a ball cam 213, a pressure plate 215, an armature 217, a ring-shaped electromagnet 219, a controller, and the like.

[0005] The rotating case 203 includes front and rear rotors 22.
1, 223 and a cylindrical member 225.

The front rotor 221 is required to have a strength for transmitting torque, and is therefore made of an iron-based alloy. The rear rotor 223 forms a part of a magnetic circuit of the electromagnet 219. From, it is made of an iron-based magnetic alloy. The cylindrical member 225 is made of a non-magnetic material such as aluminum to prevent magnetic leakage from the magnetic circuit.

For this reason, the rotating case 203 is provided on both sides of the cylindrical member 225 made of a non-magnetic material.
21 and 223 are arranged, so these are fixed,
Alternatively, they need to be linked.

The front rotor 221 and the cylindrical member 225 are fixed by bolts 227, and the rear rotor 223 and the cylindrical member 225 are engaged with each other by a meshing portion 229 provided between them.
Are connected in the rotation direction.

The front rotor 221 has a connecting shaft 23
1 are integrally formed, and the connecting shaft portion 231
Has a companion flange connected by serrations. The companion flange is connected to a flange on the joint side, and the joint is connected to a propeller shaft on the rear wheel side.

The inner shaft 205 is connected to the rear rotor 2
23 penetrates the rotating case 203. A drive pinion shaft is spline-connected to the inner shaft 205, and a drive pinion gear formed on the drive pinion shaft meshes with a ring gear on the rear differential side.

The main clutch 207 is connected to the rotating case 20
3 (cylindrical member 225) and the inner shaft 205, and the control clutch 209 is disposed between the cylindrical member 225 and the cam ring 211.

The ball cam 213 is disposed between the cam ring 211 and the pressure plate 215, and the pressure plate 215 is connected to the inner shaft 205 so as to be movable in the axial direction.

The armature 217 is arranged between the control clutch 209 and the pressure plate 215.

The electromagnet 219 is disposed outside the rotating case 203, and the controller controls the vehicle speed, the steering angle, the lateral G
The turning traveling is detected from the above, or the excitation of the electromagnet 219, the control of the excitation current, the excitation stop, and the like are performed in accordance with the road surface condition or the like.

When the electromagnet 219 is excited, the armature 217 is attracted and presses the control clutch 209. When the control clutch 209 is engaged, a torque is applied between the rotating case 203 and the inner shaft 205, and the ball cam 213 is moved. The main clutch 207 is actuated and the main clutch 207 is pressed via the pressure plate 215 by the generated cam thrust force.

When the coupling 201 is connected in this manner, the driving force of the engine is transmitted to the rear wheels, and the vehicle is brought into a four-wheel drive state.

When the excitation of the electromagnet 219 is stopped, the control clutch 209 is released, the cam thrust force of the ball cam 213 disappears, the main clutch 207 is released, the connection of the coupling 201 is released, and the vehicle enters a two-wheel drive state. .

[0018]

However, in the coupling 201, since the front rotor 221 and the cylindrical member 225 are fixed with the bolts 227, the depth of the bolt holes 233 and the thickness of the flange portion 235 of the front rotor 221 are changed. Since the rotating case 203 is increased in size and increased in weight by the axial dimension L, the in-vehicle mountability is correspondingly reduced.

However, if the size of the rotating case 203 is reduced in order to improve the on-board performance, the space for accommodating the main clutch 207 and the control clutch 209 is reduced, so that the torque capacity of the coupling 201 is reduced accordingly.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coupling capable of providing a large space for accommodating a friction clutch and obtaining a sufficient torque capacity while improving the mountability by reducing the size and weight.

[0021]

According to a first aspect of the present invention, there is provided a coupling including a case-like torque transmitting member having a case member made of a non-magnetic material, an axial side wall member made of a magnetic material, and a connecting shaft. A shaft torque transmitting member on the other side penetrating the case-shaped torque transmitting member, a clutch disposed between the case member and the shaft-shaped torque transmitting member, and an electromagnet intermittently connecting the clutch; Is provided with a projection that abuts the case-shaped torque transmission member, and the connection shaft and the case-shaped torque transmission member are brought into contact with each other by abutting the projection and the case-shaped torque transmission member with a nut screwed to the connection shaft. Is fixed.

As described above, since the convex portion of the connecting shaft and the case-shaped torque transmitting member are fixed by the nut and the bolt is not used, unlike the conventional example, an increase in size, an increase in weight, and a decrease in vehicle mountability are prevented. You.

Therefore, it is not necessary to reduce the size of the case-shaped torque transmitting member in order to improve the in-vehicle mountability, and it is possible to prevent the clutch accommodating space from being narrowed, so that the coupling can obtain a sufficient torque capacity.

According to a second aspect of the present invention, there is provided a coupling including a case-like torque transmitting member having a case member made of a non-magnetic material, an axial side wall member made of a magnetic material, and a connecting shaft. A shaft-shaped torque transmitting member on the other side that has penetrated, a main clutch and a control clutch disposed between the two torque transmitting members, an armature disposed inside the case-shaped torque transmitting member, and a case-shaped torque transmitting member. An electromagnet, which is disposed outside and moves the armature through a magnetic circuit formed by the axial side wall member, the control clutch and the armature, and intermits the control clutch, and both torque transmission members when the control clutch is connected. And a cam that operates by receiving the transmission torque between the main clutch and the main clutch. Is provided with a protrusion which abuts the click transmission member by abutting the convex portion and the case-like torque transmitting member by a screwed connection shaft nut,
The coupling shaft and the case-shaped torque transmitting member are fixed.

The electromagnet moves the armature to intermittently operate the control clutch. When the control clutch is connected, a torque is applied between the torque transmitting members to operate the cam, and the main clutch is connected by the generated cam thrust force. The coupling is connected.

When the exciting current of the electromagnet is controlled, the cam thrust force changes due to slippage of the control clutch,
The coupling force of the main clutch and the transmission torque of the coupling can be adjusted.

When the excitation of the electromagnet is stopped, the control clutch is released and the thrust force of the cam disappears.
The main clutch is released and the connection of the coupling is released.

In the coupling according to the second aspect, similarly to the coupling according to the first aspect, by fixing the connecting shaft and the case-shaped torque transmitting member with a nut, an increase in size, an increase in weight, and a decrease in vehicle mountability can be achieved. In addition to this, it is possible to prevent a space for accommodating both clutches from being narrowed, and to obtain a sufficient torque capacity.

If this coupling is arranged in each power transmission system on the front wheel side or the rear wheel side of the four-wheel drive vehicle, the coupling and disconnection of each side wheel is performed, and the coupling of each side wheel is performed. The vehicle will be in a four-wheel drive state if separated, and the vehicle will be in a two-wheel drive state if separated.

The coupling is connected to a front differential (a differential device for distributing the driving force of the engine to the left and right front wheels) and a rear differential (a differential device for distributing the driving force of the engine to the right and left rear wheels) of a four-wheel drive vehicle. It is also possible to arrange them on the left and right axles.

Also in this case, when the coupling is connected, the vehicle enters a four-wheel drive state, and when the coupling is released, each differential device rotates freely and differentially, so that the driving force to the wheel side is obtained. Transmission is stopped,
The vehicle enters a two-wheel drive state.

[0032] The invention of claim 3 is the invention of claim 1 or claim 2.
The coupling according to any one of claims 1 to 3, wherein the case member and the connection shaft of the case-shaped torque transmission member are fixed with a nut, and the same effects as those of the first or second aspect are obtained.

The invention of claim 4 is the invention of claim 1 or claim 2.
The coupling according to claim 1, wherein the axial side wall member of the case-shaped torque transmitting member and the connecting shaft are fixed with a nut, and the same effects as those of claim 1 or claim 2 are obtained.

According to a fifth aspect of the present invention, there is provided the first to fourth aspects.
The coupling according to any one of claims 1 to 3, wherein a joint connected to a mating side is jointly fastened with a case-shaped torque transmitting member by a nut on a connecting shaft. An effect equivalent to any of the above items 4 is obtained.

In addition, by fastening the joint together with the case-shaped torque transmitting member on the connecting shaft, the number of parts and the cost of parts are reduced accordingly.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment (coupling 1) of the present invention will be described with reference to FIG.

This coupling 1 has the features of claims 2, 3 and 5. The right side of FIG. 1 corresponds to the front of a four-wheel drive vehicle using the coupling 1. In addition, members and the like without reference numerals are not shown.

This coupling 1 is arranged in the power transmission system on the rear wheel side, and connects and disconnects the rear wheel.

The driving force of the engine is transmitted from the transmission to the front wheels and the rear wheels via the transfer. The driving force transmitted to the front wheels is transmitted to a front differential (a differential device that distributes the driving force of the engine to the left and right front wheels), and is distributed from the front differential to the left and right front wheels. Further, the driving force transmitted to the rear wheel is transmitted to the coupling 1 via the propeller shaft.

When the coupling 1 is connected, the vehicle enters a four-wheel drive state, and the driving force of the engine is transmitted to a rear differential (a differential device for distributing the driving force of the engine to the left and right rear wheels), and is transmitted through the rear differential. To the left and right rear wheels.

When the coupling 1 is disconnected, the vehicle enters the two-wheel drive state, and the rear-wheel-side power transmission system below the rear differential is disconnected.

The coupling 1 is arranged on the front end side of a differential carrier 3 for accommodating a rear differential.
(A case-like torque transmitting member on one side), an inner shaft 7 (an axial torque transmitting member on the other side), a multi-plate type main clutch 9, and a multi-plate type control clutch 11,
Cam ring 13, ball cam 15 (cam), pressure plate 17, armature 19, ring-shaped electromagnet 2
0, a connecting shaft 21, a nut 23, a companion flange (joint) 25, a controller, and the like.

The rotating case 5 includes the front case member 2.
7 and a rear rotor (axial side wall member) 28. The front case member 27 is made of a non-magnetic material such as aluminum, and the rear rotor 28 is made of an iron-based magnetic material. The connecting shaft 21 is made of an iron-based alloy.

At the front end of the case member 27, a small-diameter hub portion 29 is provided.
1 and supported by a differential carrier 3. A seal 33 is disposed between the differential carrier 3 and the hub 29 to prevent oil leakage from the differential carrier 3 and entry of foreign matter.

The rotor 28 is spline-coupled to the rear end of the case member 27 and is prevented from falling off by a retaining ring 41. The space between the case member 27 and the rotor 28 on the rear side is sealed by a seal member 34.

The connecting shaft 21 is spline-connected to the hub 29 of the case member 27 of the rotating case 5 and
The seal member 30 seals the space between the hub 29 and the connecting shaft 21. The connecting shaft 21 is integrally provided with a convex portion 35 that abuts on the hub portion 29. And
A companion flange 25 is attached to the front end of the connecting shaft 21 protruding outward (forward) from the hub 29 of the case member 27.
Are spline-connected. Hub part 2 of rotating case 5
9 and the companion flange 25, together with the washer 37, are sandwiched between the projection 35 of the connecting shaft 21 and the nut 23 at the front end on the connecting shaft 21 and fastened together by the nut 23. The rear end of the connecting shaft 21 supports the inner shaft 7 via a needle bearing 39 described later.

The driving force of the engine is input to the rotating case 5 (the front case member 27) via the propeller shaft on the rear wheel side, the companion flange 25, and the connecting shaft 21.

[0048] The inner shaft 7 is
And the front end is connected to the connecting shaft 21 (the case member 27) via the needle bearing 39 as described above.
And the rear end is supported by the rotor 28 on the rear side via a needle bearing 43. Inner shaft 7
An oil reservoir 7a is provided in the axial center of the front half of the oil reservoir, and an oil passage 7b is provided radially in the oil reservoir 7a.

A drive pinion shaft is spline-connected to the inner shaft 7, and a drive pinion gear formed on the drive pinion shaft meshes with a ring gear on the rear differential side. The seal between the inner shaft 7 and the rotor 28 is sealed by a seal member 44.

The main clutch 9 includes a rotating case 5
It is arranged between the inner periphery of the (case member 27) and the outer periphery of the inner shaft 7. The above control clutch 1
1 is disposed between the inner circumference of the case member 27 and the outer circumference of the cam ring 13, and has the armature 19 as described below.
As a result, it is pressed against the wall of the rear rotor 28 and fastened.

The ball cam 15 is arranged between the cam ring 13 and the pressure plate 17. or,
A thrust bearing that receives a cam reaction force of the ball cam 15 is disposed between the cam ring 13 and the rear rotor 28. The pressure plate 17 is connected to the outer periphery of the inner shaft 7 movably in the axial direction, and is connected to the inner shaft 7 in the rotation direction.

The armature 19 is axially movable between the control clutch 11 and the pressure plate 17. Also, the wall portion 40 of the case member 27
A plate 45 is disposed between the main clutch 9 and the main clutch 9. The plate 45 receives the cam thrust force of the ball cam 15 and exchanges the ball with a different thickness to adjust the clutch plate of the main clutch 9 to an optimum clearance. can do.

The electromagnet 20 is fixed to the differential carrier 3, supports the rear rotor 28 (rotating case 5) via a seal bearing 49, and forms an appropriate air gap 22 with the rear rotor 28. I have. Electromagnet 20
Core 47, rear rotor 28, control clutch 1
1. A magnetic circuit is constituted by the armature 19, and when the electromagnet 20 is excited, a magnetic loop passing through them is generated.

Thus, the sliding parts such as the main clutch 9, the control clutch 11 and the ball cam 15 are lubricated and cooled by the lubricating oil in the coupling 1 sealed by the seal members 30, 34, 44.

The controller detects the turning traveling from the vehicle speed, the steering angle, the lateral G, and the like, or performs the excitation of the electromagnet 20, the control of the excitation current, the stop of the excitation, and the like according to the road surface condition and the like.

When the electromagnet 20 is excited, the armature 1
9 is sucked, and the control clutch 11 is pressed and engaged with the rear rotor 28. When the control clutch 11 is engaged, a torque is applied between the rotating case 5 and the inner shaft 7 to operate the ball cam 15,
The main clutch 9 is pressed and fastened via the pressure plate 17 by the generated cam thrust force.

When the coupling 1 is thus connected,
The driving force of the engine is sent to the rear wheels, and the vehicle enters a four-wheel drive state.

When the exciting current of the electromagnet 20 is controlled, the cam thrust force of the ball cam 15 changes due to the slip of the control clutch 11, the coupling force of the main clutch 9 changes, and the driving force sent to the rear wheels is adjusted.

Controlling the driving force distribution ratio between the front and rear wheels in this way improves, for example, the steering and stability of the vehicle during turning.

When the excitation of the electromagnet 20 is stopped, the control clutch 11 is released, the cam thrust force of the ball cam 15 disappears, the main clutch 9 is released, the connection of the coupling 1 is released, and the vehicle enters a two-wheel drive state. .

Oil leakage and foreign matter intrusion are prevented at the front portion of the rotating case 5 by the sealing effect of the sealing member 30 between the hub portion 29 and the connecting shaft 21.

The seal member 34 between the case member 27 and the rear rotor and the seal member 44 between the inner shaft 7 and the rear rotor prevent oil leakage and foreign matter intrusion at the rear part of the rotary case 5. Has been prevented.

As described above, the rotating case 5 is sealed, and the main clutch 9, the control clutch 11, the ball cam 15, the bearings, and the like are lubricated by the oil sealed therein.

Thus, the coupling 1 is configured.

As described above, in the coupling 1, the projection 35 of the connecting shaft 21 and the case member 27 (the rotating case 5) are fastened together with the nut 23 sandwiching the companion flange 25, and these are fixed. .

As described above, unlike the conventional example, the coupling 1 uses the needle bearing 39 for supporting the inner shaft 7 and does not use a structure in which the connecting shaft 21 is spline-connected to the rotating case 5 and fixed by bolts. Therefore, the increase in size and weight and the decrease in vehicle mountability are prevented.

Therefore, it is not necessary to reduce the size of the rotating case 5 in order to improve the on-board performance, and the arrangement space for the main clutch 9 and the control clutch 11 can be made sufficiently large. The torque capacity is obtained.

Since the companion flange 25 is fastened together with the rotating case 5 by the nut 23, the number of parts and the cost of parts are reduced accordingly.

Next, a second embodiment (coupling 61) of the present invention will be described with reference to FIG.

This coupling 61 is described in claims 2, 4, and 5.
It has the following features. The left side of FIG. 2 corresponds to the front of the four-wheel drive vehicle using the coupling 61, and the members and the like without reference numerals are not shown.

The coupling 61 is arranged in the power transmission system on the rear wheel side, and connects and disconnects the rear wheel. Hereinafter, members and the like having the same configuration as the coupling 1 of the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

The coupling 61 is housed in a protective case 63 fixed to the vehicle body side.
(A case-shaped torque transmitting member on one side), an inner shaft 7 (an axial torque transmitting member on the other side), a multi-plate type main clutch 9 and a control clutch 11 (details of the structure are omitted), a cam ring 13, and a ball cam 15 , Pressure plate 17, armature 19, ring-shaped electromagnet 67, connecting shaft 69, nut 23, companion flange 25 (joint), controller and the like.

The protective case 63 is formed in a cylindrical shape.
It is fixed to a vehicle body (not shown). A flange 71 a formed at the core 71 of the electromagnet 67 is fixed to the left end opening by a bolt 73. And
Through the front and rear seal bearings 75 and 77,
The coupling 61 supports a later-described rotating case 65. A seal member 79 is provided outside the rear seal bearing 77. The space between the protective case 63 and the coupling 61 is sealed by the seal member 79 and the seal bearing 75.

The rotating case 65 includes a front rotor 81.
(The axial side wall member) and the rear case member 83 are joined. The rotor 81 is made of an iron-based magnetic material, and the case member 83 is made of a non-magnetic material such as aluminum. The connecting shaft 69 is made of an iron-based alloy. The lead wire 85 of the electromagnet 67 is drawn directly from the core 71 to the outside.

The connecting shaft 69 is connected to the hub 8 of the rotor 81.
7, and the space between the hub 87 and the connecting shaft 69 is sealed by the seal member 30. And
The companion flange 25 is spline-connected to the front half of the connection shaft 69 protruding outside (front) of the hub 87. Further, the connecting shaft 69 is provided with a convex portion 89 which abuts on the hub portion 87, and the companion flange 25 is sandwiched between the convex portion 89 and the nut 23 together with the hub portion 87 of the rotor 81 and the washer 37. Are tightened together.

In this way, the connecting shaft 69 and the rotor 81 (rotating case 65) are fixed, and the driving force of the engine is input to the coupling 61 via the companion flange 25.

The inner shaft 7 is provided with a rotating case 65.
And a front end thereof is supported by a rear end of the connecting shaft 69 via a needle bearing 39. The rear end of the inner shaft 7 is supported by the case member 83 (rotary case 65) via the needle bearing 43, and is connected to the rear differential via the output shaft 93.

The main clutch 9, the control clutch 11, the cam ring 13, the ball cam 15, the pressure plate 17, and the armature 19 are arranged between the rotating case 65 and the inner shaft 7.

A magnetic circuit is constituted by the core 71 of the electromagnet 67, the rotor 81, the control clutch 11, and the armature 19. When the electromagnet 67 is excited, a magnetic loop passing through them is generated. An air gap 90 is provided between the core 71 and the rotor 81.

A ring 91 made of stainless steel is disposed on the wall 81a of the rotor 81, and the clutch plate of the control clutch 11 is provided with a notch. The ring 91 and the notch prevent the magnetic loop from being short-circuited on the magnetic circuit, and the magnetic force of the electromagnet 67 is effectively guided to the armature 19.

The inside of the rotating case 65 is sealed by a seal bearing 75 and the seal member 44.
The main clutch 9,
The control clutch 11, the ball cam 15, each bearing and the like are lubricated.

Thus, the coupling 61 is configured.

As described above, the coupling 61 uses the nut 23 to connect the connecting shaft 69 and the rotor 81 (rotating case 65) and does not use bolts. In addition, a reduction in vehicle mountability is prevented.

Therefore, it is not necessary to reduce the size of the rotating case 65 in order to improve the on-board performance, and it is possible to make the arrangement space for the main clutch 9 and the control clutch 11 sufficiently large. A large torque capacity can be obtained.

Further, since the nut 23 for attaching the companion flange 25 is used to jointly fasten the connecting shaft 69 and the rotating case 65, the number of parts and the cost of parts are reduced accordingly.

The invention of claim 1 does not amplify the pressing force of the clutch by a cam as in the couplings 1 and 61 of each embodiment (the invention of claim 2), but is moved by an electromagnet. This is a coupling for intermittently connecting the torque transmitting member with a clutch pressed by the armature, and an effect equivalent to that of the second aspect is obtained by fastening the coupling shaft and the case-shaped torque transmitting member together with a nut.

In the present invention, the clutch is not limited to the multi-plate clutch, but may be, for example, a cone clutch.

[0088]

According to the first aspect of the present invention, the coupling shaft and the case-shaped torque transmitting member are jointly fastened with the nut, thereby preventing an increase in size, an increase in weight, and a decrease in vehicle mountability.

Further, since a space for accommodating the clutch can be prevented from being reduced, a sufficient torque capacity can be obtained.

The coupling according to the second aspect has the same effect as that of the first aspect.

The coupling according to the third aspect has the same effect as the configuration according to the first or second aspect.

The coupling of the fourth aspect has the same effect as that of the first or second aspect.

According to the fifth aspect of the present invention, the same effect as any one of the first to fourth aspects is obtained, and the coupling for connection to the mating side is connected when the coupling shaft and the case-shaped torque transmitting member are fastened together. The number of parts and the cost of parts are reduced by using the nut.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a coupling according to a first embodiment.

FIG. 2 is a cross-sectional view illustrating a coupling according to a second embodiment.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

1,61 Coupling 5,65 Rotating case (one-side case-like torque transmitting member) 7 Inner shaft (other-side axial-like torque transmitting member) 9 Main clutch 11 Control clutch 15 Ball cam (cam) 19 Armature 20,67 Electromagnet 21, 69 Connecting shaft 23 Nut 25 Companion flange (joint) 27, 83 Case member 28, 81 Rotor (axial wall member) 35, 89 Projection provided on connecting shaft

Claims (5)

[Claims] 1. A case-shaped torque transmitting member having a case member made of a non-magnetic material, an axial side wall member made of a magnetic material, and a connecting shaft, and a shaft on the other side penetrating the case-shaped torque transmitting member. -Shaped torque transmitting member, a clutch disposed between the case member and the shaft-shaped torque transmitting member, and an electromagnet for intermittently connecting and disconnecting the clutch. The connecting shaft has a convex portion that abuts the case-shaped torque transmitting member. A coupling, wherein the coupling shaft and the case-shaped torque transmitting member are fixed by abutting the convex portion and the case-shaped torque transmitting member with a nut screwed to the coupling shaft. . 2. A case-shaped torque transmitting member having a case member made of a non-magnetic material, an axial side wall member made of a magnetic material, and a connecting shaft, and a shaft on the other side penetrating the case-shaped torque transmitting member. A torque transmission member, a main clutch and a control clutch disposed between the two torque transmission members, an armature disposed inside the case-shaped torque transmission member, and disposed outside the case-shaped torque transmission member. An electromagnet that moves the armature through a magnetic circuit formed by the axial side wall member, the control clutch, and the armature, and intermits the control clutch;
When the control clutch is connected, a cam that operates by receiving the transmission torque between the two torque transmission members and connects the main clutch is provided.The connection shaft is provided with a convex portion that abuts the case-shaped torque transmission member, A coupling characterized in that the connecting shaft and the case-shaped torque transmitting member are fixed by abutting the convex portion and the case-shaped torque transmitting member with a nut screwed to the connecting shaft. 3. The coupling according to claim 1, wherein the case member of the case-shaped torque transmitting member and the connection shaft are fixed with a nut. 4. The coupling according to claim 1, wherein the axial side wall member of the case-shaped torque transmitting member and the connecting shaft are fixed with a nut. 5. The invention according to claim 1, wherein the joint connected to the mating side is jointly fastened to the case-shaped torque transmitting member by a nut on the connecting shaft. A coupling characterized in that: