JPH11344102A - Differential gear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the assembly of an operation mechanism for a function change-over clutch. SOLUTION: In a differential gear composed of a casing 3 fixed thereto with a casing body 5 and a cover 11, an outer casing 9 accommodated in the casing 3 and adapted to be rotated by a drive force from an engine, an inner casing 11 located in the outer casing 9, a differential mechanism 39 for distributing the rotation of the inner casing 11 among wheels, a clutch 69 for engaging and disengaging the inner and outer casings 9, 12 to and from each other, and an electric motor 71 for operating the clutch 69 through the intermediary of an operating force transmission system 73, an operating force transmission member extending from the electric motor 71 from a coupling means 91 is assembled to the cover 7 side so that the coupling means 91 is coupled at the step of fixing the cover 7 to the casing body 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a differential device for a vehicle.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 2529245 discloses a differential device 201 as shown in FIG.

[0003] The differential device 201 is used for a four-wheel drive vehicle. Case of differential device 201
Singing structure is outer case 203 and inner case 2
05 and a double structure. Outer case 203
Is the differential carrier 20 via the bearings 207, 207.
9 and is rotatably driven by the driving force of the engine.

The inner case 205 is an outer case 2
03 is rotatably supported on the inner circumference of
The pinion shaft 213 of the bevel gear type differential mechanism 211 is fixed to the gear 205.

A slide gear 215 is movably connected to the inner periphery of the outer case 203, and a meshing clutch 217 is provided between the slide gear 215 and the inner case 205. .

The differential carrier 209 comprises a casing 219 and a cover 221 fixed to the casing 219, and a cylinder 223 is mounted on the casing 219.

When pressure is applied to the cylinder 223, the shift fork 227 integrated with the piston 225 moves,
The slide gear 215 is moved via the thrust bearing 229 and the coil spring 231 to engage the meshing clutch 217.

When the meshing clutch 217 is engaged, the outer case 203 and the inner case 205 are connected, and the rotation of the inner case 205 is performed by the differential mechanism 211 via the axles 233 and 235 for each wheel. Side and the vehicle is in a four-wheel drive state.

When the supply of pressure to the cylinder 223 is stopped, the slide gear 215 is retracted by the return spring 237, the engagement of the engagement clutch 217 is released, and the vehicle is driven by two wheels.

[0010]

The outer case 203 of the differential device 201 is mounted on a casing body 219 of the differential carrier 209, and thereafter, the cover-2 is provided.
21 is fixed to the casing body 219.

However, a pump for applying pressure to the cylinder 223 is disposed outside the differential carrier 209, and after fixing the cover-221, the pump is attached and the cover-221 is mounted.
A pressure pipe passing through 21 must be connected to the cylinder 223, which requires a lot of man-hours for installation, is troublesome, and has a high working cost.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a differential device which includes an operation mechanism for a function switching clutch and which is extremely easy to assemble.

[0013]

According to a first aspect of the present invention, there is provided a differential device comprising a casing having a casing body and a cover fixed thereto, and a casing housed in the casing and rotated by a driving force of an engine. A differential mechanism for distributing the rotation of the differential case from a pair of output side gears to the wheels, a clutch for switching functions, and an electric motor for operating the clutch via a transmission system for operating force. And an operating force transmitting system member from the electric motor to the connecting portion is mounted on the cover side. , Cover
The connection of the connecting portion is completed in the process of fixing the connecting portion to the thing body.

[0014] As described above, the connecting portion that can be engaged and disengaged with the operating force transmission system is provided, and the operating force transmitting system member from the electric motor to the connecting portion is mounted on the cover side, so that the cover is provided. Is fixed to the casing body, the connection of the connecting portion is completed.

In this manner, the fixing of the cover and the connection of the operating force transmission system are performed simultaneously, so that the differential device of the present invention is very easy to assemble and the work cost is greatly reduced, unlike the conventional device. Is done.

Further, since the electric motor and the operating force transmitting member are mounted on the cover, they are within the range of the projected area of the cover in the front-rear direction of the vehicle, so that the aerodynamic resistance is reduced. There is no increase, interference with peripheral members, decrease in load clearance, and the like.

Further, since the electric motor is smaller than the pump used in the conventional example, the use of the electric motor as the operating force source makes it possible to operate the motor in addition to the operating force transmitting member. A power source (electric motor) can be mounted on the cover, and as described above, the cover and the operating force transmission system can be easily mounted.

Further, the work of connecting the electric motor and the power source after the cover is attached is easy.

According to a second aspect of the present invention, there is provided the differential device according to the first aspect, wherein the shift fork and the shift rod are disposed in the cover-side operating force transmission system, and are provided on the clutch-side member. The groove and the tip of the shift fork form a connecting portion of the operating force transmission system, and the tip of the shift fork engages with the groove of the clutch side member in the process of fixing the cover to the casing body. And an effect equivalent to that of the configuration of claim 1 is obtained.

In addition, by forming the connecting portion of the operating force transmitting system between the groove of the clutch side member and the shift fork, most of the operating force transmitting system member is assembled on the cover. become.

Therefore, the operation of assembling the differential case (differential mechanism) to the casing body may be obstructed by an operating force transmission member such as a gear supported on the casing body side. Since this is eliminated, the assembling work is further facilitated.

Further, when fixing the cover to the casing body, it is extremely easy to engage the tip of the shift fork with the groove of the clutch side member.

According to a third aspect of the present invention, there is provided the differential device according to the first aspect, wherein a gear train is provided in the operating force transmitting system, and a connecting portion of the operating force transmitting system is formed between the gears. In the process of fixing the cover to the casing body, the gears are engaged with each other, and the same effect as that of the first aspect is obtained.

Further, when fixing the cover to the casing body, it is very easy to engage the gears of the operating force transmission member.

The invention of claim 4 is the first to third aspects of the present invention.
5. The differential device according to claim 1, wherein the electric motor is disposed outside the cover, and an output shaft of the electric motor penetrates through the cover. An effect equivalent to any one of the third aspect is obtained.

In addition, since the electric motor is arranged outside the cover, consideration for protecting the electric motor from oil (sealing member and sealing work) is not required. The cost is reduced accordingly.

The electric motor disposed outside the cover is easy to maintain, inspect and replace.

According to a fifth aspect of the present invention, there is provided the differential device according to the fourth aspect, wherein a concave portion is provided outside the cover, and the electric motor is disposed in the concave portion. An effect equivalent to that of the configuration of item 4 is obtained.

In addition, in this configuration in which the electric motor is disposed in the concave portion of the cover, the electric motor does not protrude greatly from the cover, so that interference with peripheral members can be avoided and traveling can be prevented. The possibility that an object coming in collides with the electric motor is reduced accordingly.

The invention of claim 6 is the first to third aspects of the present invention.
The differential device according to any one of claims 1 to 3, wherein the electric motor is disposed inside the cover, and an effect equivalent to any one of claims 1 to 3 is obtained.

In addition, by disposing the electric motor inside the cover, it is not necessary to provide a through-hole for penetrating the output shaft of the electric motor in the cover. Since there is no need to arrange an oil seal, the cost is reduced accordingly.

Since not only a through hole but also a concave portion for disposing an electric motor is not required, a conventional method of attaching a support portion of an operating force transmitting member to a cover, for example, is used. The cover can be used as it is,
It can be implemented at lower cost.

Also, in this configuration in which the electric motor is disposed inside the cover, interference between the electric motor and peripheral members does not occur, and an object flying during traveling collides with the electric motor. Nothing.

[0034] The invention of claim 7 is the first to sixth aspects of the present invention.
The differential device according to any one of claims 1 to 3, wherein the differential case includes an outer case that is rotated by a driving force of the engine, and an inner case that is relatively rotatably disposed inside the outer case. The differential mechanism is fixed to the inner case, and the clutch is
The driving force is intermittently interposed between the case and the inner case, and an effect equivalent to any one of claims 1 to 6 is obtained.

In this differential device, the outer case and the inner case are driven by the clutch during four-wheel drive travel.
The driving force of the engine for rotating the outer case is transmitted from the inner case to the differential mechanism, and is distributed to the wheels via the output side gear.

During two-wheel drive, the clutch is disengaged, and the inner case and the differential mechanism are disconnected from the engine to improve fuel efficiency.

The invention of claim 8 is the first to sixth aspects of the present invention.
The differential device according to any one of the above, wherein the clutch is disposed between the differential rotation member of the differential mechanism, and locks the differential rotation of the differential mechanism,
An effect equivalent to any one of claims 1 to 6 is obtained.

In this differential device, when the clutch arranged between the differential rotating members is connected, the differential rotation of the differential mechanism is locked, and when the clutch is released, the differential becomes free.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a differential device 1 according to this embodiment. The differential device 1 has the features of claims 1, 2, 4, 5, and 7. Note that the left and right directions are the left and right directions in FIG. 1, and the members and the like without reference numerals are not shown.

This differential device 1 is used in a four-wheel drive vehicle, and is arranged on a wheel side that is separated when traveling by two-wheel drive.

As shown in FIG. 1, the differential device 1 is housed in a differential carrier 3 (casing). The differential carrier 3 is composed of a casing main body 5 and an end cover 7 fixed to a rear portion thereof. ing. The differential carrier 3 has an oil reservoir.

The differential case of the differential device 1 has a double structure of an outer case 9 and an inner case 11.

The outer case 9 is connected to the case member 13 and the case.
And the fixing member 15 is fixed by bolts 17,
Left and right boss portions 21 and 23 are formed by bearings 19 and 19.
Is supported by the differential carrier 3.

A ring gear is fixed to the outer case 9, and the ring gear is a drive pinion gear 25.
And are engaged. The drive pinion gear 25 is formed integrally with the rear end of the drive pinion shaft 27.
The drive pinion shaft 27 has bearings 29 and 31
And a flange member 33 is spline-connected to a front end of the casing body 5, and a nut 3
It is fixed at 5.

The drive pinion shaft 27 is connected to the transfer via a flange member 33, a joint, a propeller shaft and the like.

Thus, the outer case 9 is driven to rotate by the driving force of the engine via these driving force transmission systems.

The transfer is provided with a 2-4 switching mechanism for disconnecting from the engine during two-wheel drive.

The inner case 11 is formed in a ring shape, is slidably and rotatably supported on the inner periphery of the outer case 9, and is axially positioned by a case member 15.

The inner case 11 is provided with a plurality of through holes 37, into which the pinion shaft 41 of the bevel gear type differential mechanism 39 is engaged.
It is fixed by a spring pin 43. A pinion gear 45 is rotatably supported on the pinion shaft 41, and side gears 47, 49 on the output side from the left and right mesh with each pinion gear 45. A spherical washer 51 is formed on the inner periphery of the inner case 11 for receiving the centrifugal force of the pinion gear 45 and the reaction force.

The boss portions 53, 5 of the side gears 47, 49
5 is supported by bearings 57, 59 of the outer case 9. Each axle is spline-connected to each of the bosses 53 and 55, and each axle is connected to the left and right wheels. A thrust washer 61 is arranged between each of the side gears 47 and 49 and the outer case 9, and receives a meshing reaction force of the side gears 47 and 49.

The clutch member 63 is provided on the outer case 9.
Are arranged movably in the axial direction, and a plurality of legs 65 are formed on the clutch member 63. An opening 67 is formed in the outer case 9, and the clutch member 63 is connected to the outer case 9 in a rotational direction by passing the leg 65 through the opening 67.

An engagement clutch 69 (clutch) is provided between the right end of the inner case 11 and the clutch member 63.

When the clutch member 63 is operated to move to the left, the meshing clutch 69 meshes to connect the outer case 9 and the inner case 11 and the clutch member 6
When the gear 3 is moved to the right, the meshing of the meshing clutch 69 is released as shown in FIG.
And the inner case 11 are cut off.

The operation of moving the clutch member 63 is performed by a reversible electric motor 71 and an operation force transmission system 73 for transmitting the operation force to the clutch member 63.

A recess 75 is provided outside the end cover 7, and the electric motor 71 is disposed in the recess 75. A broken line 77 indicates a conventional end cover in which the concave portion 75 is not processed.
Is arranged in the concave portion 75 of the end cover 7,
The electric motor 71 is arranged at a position where it does not protrude outward from the conventional end cover.

The operating force transmitting system 73 includes an output shaft 79 of the electric motor 71, a gear 81, a gear 83, a screw mechanism 85, a shift rod 87, a shift fork 89, a clutch member 63,
It is composed of a connecting portion 91 and the like.

The output shaft 79 of the electric motor 71 passes through the end cover 7 and is rotatably supported by a support 93 provided on the end cover 7 via a bearing. A seal 95 is disposed between the output shaft 79 and the through-hole to prevent oil from leaking to the outside and entry of foreign matter into the inside.

The gear 81 is formed on the output shaft 79.
The gear 83 is connected to a shift rod 87 via a screw mechanism 85.
And is supported by the end cover 7 so as not to move in the axial direction.

The shift fork 89 is spline-connected to the end of the shift rod 87, and is fixed by a nut 97.

The shift rod 87 has support portions 93, 94
The clutch member 63 is provided with a groove 99 on the outer periphery of the clutch member 63 so that the tip of the shift fork 89 is engaged with the groove 99 to be disengageable. The unit 91 is constituted.

When the electric motor 71 is rotated in one direction,
The gear 83 is rotated by the engagement with the gear 81, the screw mechanism 85 is operated, and the clutch member 63 is moved to the left via the shift rod 87 and the shift fork 89.
The meshing clutch 69 meshes. Also, the electric motor 71
Is rotated in the opposite direction, the clutch member 63 is moved to the right, and the meshing of the meshing clutch 69 is released.

When the meshing clutch 69 is engaged, the outer case 9 and the inner case 11 are connected to each other, and the vehicle is in a four-wheel drive state. It becomes a two-wheel drive state.

The meshing clutch 69 and the transfer 2
The -4 switching mechanism is operated for connection when switching from the two-wheel drive state to the four-wheel drive state, and is operated for disconnection when switching from the four-wheel drive state to the two-wheel drive state.

In the four-wheel drive state, the driving force of the engine for rotating the outer case 9 rotates the inner case 11 through the meshing clutch 69, and this rotation is performed by the pinion shaft 41 of the differential mechanism 39. The gears are distributed to side gears 47 and 49 via a pinion gear 45 and transmitted to left and right wheels via an axle.

For example, if a driving resistance difference occurs between the wheels during running on a rough road, the driving force of the engine is differentially distributed to the left and right sides by the rotation of each pinion gear 45.

In the two-wheel drive state in which the engagement of the dog clutch 69 is released, the wheels from the inner case 11 (differential mechanism 39) to the wheels are in a free rotation state, and
The power transmission system from the -4 switching mechanism to the outer case 9 is disconnected from both the driving force of the engine and the rotational force of the wheels, and stops rotating.

As described above, the rotation of the separated wheel-side power transmission system is prevented, so that in the two-wheel drive state, the vibration is reduced and the riding comfort is improved, and the wear of each part of the power transmission system is reduced to reduce the durability. In addition, the load on the engine is reduced by the reduced rotational resistance, and the fuel efficiency is improved.

On the inner periphery of the boss portions 21 and 23 of the outer case 9, spiral oil grooves 101 and 103 are provided. By the rotation of the ring gear fixed to the outer case 9, oil is repelled from the oil reservoir of the differential carrier 3, and these oil grooves 101 and 103 and the opening 6 are formed.
7 flows into and out of the outer case 9 and the outer case 9
Sliding portion between the inner case 11 and the meshing clutch 6
9. Lubricate the engaging portion and the sliding portion of the differential mechanism 39.

The meshing portions of the gears 81 and 83 of the operating force transmission system 73 and the screw mechanism 8
5. Since the sliding portion between the shift fork 89 and the groove 99 is sufficiently lubricated and seizure and abnormal wear are prevented, the intermittent function of the driving force by the electric motor 71 and the operating force transmission system 73 is provided. , Keeps normal for a long time.

The outer case 9 in which the inner case 11 and the differential mechanism 39 are assembled is assembled to the casing body 5, and thereafter, the end cover 7 is attached to the casing body 5.
Is fixed.

As described above, the output shaft 79 (gear 81), the gear 83, and the shift rod 8 which are members of the electric motor 71 and the operating force transmitting system up to the connecting portion 91 of the operating force transmitting system 73.
7. The shift fork 89 is mounted on the end cover 7, and the tip of the shift fork 89 and the clutch member 63
The connecting portion 91 is constituted by the groove 99.

Accordingly, when the end cover 7 is fixed to the casing body 5 in a state where the tip of the shift fork 89 and the groove 99 of the clutch member 63 are aligned, in the process, the shift fork 89 becomes grooved. 99 and the connecting portion 91
Is completed.

Thus, the differential device 1 is configured.

As described above, the differential device 1
Is provided with a connecting portion 91 which can be disengaged from the operating force transmitting system 73, and the operating force transmitting system member from the electric motor 71 to the connecting portion 91 is assembled to the end cover 7, so that the end cover 7 is provided. Is fixed to the casing body 5, the connection of the connecting portion 91 is completed.

As described above, since the fixing of the end cover 7 and the connection of the operation force transmission system 73 are performed simultaneously, unlike the conventional example, the assembly is extremely easy and the working cost is greatly reduced.

Since the electric motor is smaller than the pump used in the conventional example, the electric motor 7 is used as the operating force source.
1, the electric motor 71 is provided with an end cover.
7, the end cover 7 and the operating force transmission system 73 can be easily assembled as described above.

Also, since the electric motor 71 and the operating force transmitting system member are assembled on the end cover 7, they are within the projection area of the end cover 7 in the front-rear direction of the vehicle. There is no increase in the above resistance, interference with peripheral members, reduction in load clearance, and the like.

Further, since the connecting portion 91 is formed between the groove 99 of the clutch member 63 and the shift fork 89,
Since most of the operating force transmitting system members are assembled on the end cover 7, the outer case 9 (differential mechanism 39) is mounted on the case.
At the time of assembling to the singing body 5, there is no hindrance by the remaining operating force transmitting members arranged on the casing body 5 side, and the assembling work is further facilitated.

Since the connecting portion 91 formed by the tip of the shift fork 89 and the groove 99 of the clutch member 63 can be easily engaged and disengaged, the connecting portion 91 is fixed when the end cover 7 is fixed to the casing body 5. Can be easily engaged.

Further, since the electric motor 71 is disposed outside the end cover 7, a seal member for protecting the electric motor 71 from the oil of the differential carrier 3 and a sealing work are not required. The cost is reduced accordingly.

The electric motor 71 disposed outside the end cover 7 can be easily maintained, inspected, and replaced.

Since the end cover 7 is provided with the concave portion 75 and the electric motor 71 is arranged in the concave portion 75, the electric motor 71 does not protrude greatly from the end cover 7, so that the electric motor -The interference between the motor 71 and peripheral members can be avoided, and the object flying during traveling can be
The risk of collision with the data 71 is reduced accordingly.

The first embodiment described above is an example in which the electric motor 71 is disposed outside the end cover 7. As shown in FIG. 2, the electric motor 71 is disposed inside the end cover 105. It may be arranged. (Configuration of Claim 6).

As shown in FIG. 2, when the electric motor 71 is arranged inside the end cover 105, a through hole for passing the output shaft 79 of the electric motor 71 is provided in the end cover 105.
It is not necessary to provide an oil seal in this through hole, so that the cost is reduced accordingly.

Since not only the through hole but also the concave portion 75 for disposing the electric motor 71 is not required, the end cover 105 has a support member such as the support portion 93 separately from the cover. The conventional cover can be used as it is by preparing it with the body and fixing it to the cover, and the cost can be reduced accordingly.

The electric motor 71 is connected to the end cover 105.
Since the electric motor 71 and the peripheral members are not interfered with each other, the electric
No collision with the data 71 occurs.

The differential device of the present invention
By using a gear train for the operating force transmitting system and forming a connecting portion of the operating force transmitting system between the gears, these gears are engaged with each other in the process of fixing the cover to the casing body. You may. (Configuration of Claim 3).

Further, the differential device of the present invention may be arranged such that the clutch is arranged between the differential rotating members to lock the differential rotation of the differential mechanism. (Configuration of Claim 8).

In the differential device according to the present invention, the differential mechanism is not limited to a bevel gear type differential mechanism. A differential mechanism that connects side gears via a gear, a differential mechanism that uses a worm gear, or the like may be used.

The differential device of claim 7 is
The present invention can be used for both a front differential (a differential device that distributes the driving force of the engine to the left and right front wheels) and a rear differential (a differential device that distributes the driving force of the engine to the right and left rear wheels).

Further, the differential device of claim 8 is:
It can be used for any of a front differential, a rear differential, and a center differential (a differential device for distributing the driving force of an engine to front wheels and rear wheels).

[0092]

According to a first aspect of the present invention, there is provided a differential device having a coupling portion which can be disengaged from an operating force transmitting system for operating a clutch, and an operating force transmitting member from the electric motor to the connecting portion is provided on the cover side. By the assembly, the connection of the connecting portion is completed in the process of fixing the cover to the casing body.

As described above, since the cover is fixed and the operating force transmitting system is connected at the same time, the assembly is extremely easy and the working cost is greatly reduced unlike the conventional example.

Also, since the electric motor and the operating force transmitting member are mounted on the cover, they are within the projection range of the cover, so that aerodynamic resistance increases and interference with peripheral members occurs. No reduction in load clearance occurs.

According to the differential device of the second aspect, the same effect as the configuration of the first aspect is obtained, and the connecting portion of the operating force transmission system is formed between the groove of the clutch side member and the shift fork. Most of the force transmission system members are assembled on the cover, and the operation of assembling the differential case (differential mechanism) to the casing body is performed, for example, by a gear supported on the casing body side. As a result, the assembling work is further facilitated without being obstructed by the operating force transmission system member.

The differential device according to the third aspect has the same effect as the configuration according to the first aspect.

According to the differential device of the fourth aspect, the same effect as any one of the first to third aspects is obtained, and since the electric motor is arranged outside the cover, the electric motor is protected from oil. This eliminates the need for consideration and reduces costs accordingly.

The electric motor disposed outside the cover is easy to maintain, inspect and replace.

According to the differential device of the fifth aspect, the same effect as the configuration of the fourth aspect is obtained, and the electric motor is disposed in the concave portion of the cover, so that the electric motor is covered.
, So that interference with peripheral members can be avoided, and collisions between the electric motor and objects flying during traveling can be reduced.

According to the differential device of the sixth aspect, the same effect as any one of the first to third aspects can be obtained, and the electric motor is disposed inside the cover.
It is not necessary to provide a through-hole for the output shaft of the electric motor in the cover, and it is not necessary to arrange an oil seal in this through-hole, so that the cost is reduced accordingly.

Further, not only a through hole but also a concave portion for disposing an electric motor is not required. The cover can be used as it is,
It can be implemented at lower cost.

Further, the electric motor disposed inside the cover does not cause interference with peripheral members and prevents collision with an object flying during traveling.

The differential device according to the seventh aspect has the same effect as any one of the first to sixth aspects.

The differential device according to the eighth aspect has the same effect as any one of the first to sixth aspects.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a sectional view showing a second embodiment of the present invention.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Differential device 3 Differential carrier (casing) 5 Casing main body 7, 105 End cover (cover) 9 Outer case 11 Inner case 39 Differential mechanism 47, 49 Output side gear 63 Clutch member 69 Mesh clutch (clutch) 71 Electric motor 73 Operating force transmission system 75 Recess provided outside end cover 87 Shift rod 89 Shift fork 91 Connecting portion 99 Groove of clutch member 63

Claims (8)

[Claims] 1. A casing comprising a casing main body and a cover fixed thereto, a differential casing housed in the casing and rotated by a driving force of an engine, and a rotation of the differential casing. A differential mechanism for distributing the gears from the output side gears to the wheels, a clutch for switching functions, and an electric motor for operating the clutch via an operating force transmission system. A detachable connecting portion is formed, and an operating force transmitting system member from the electric motor to the connecting portion is mounted on the cover side, and the cover is attached to the cover.
The differential device, wherein the connection of the connecting portion is completed during the process of fixing the connecting portion to the sing body. 2. A shift fork and a shift rod, wherein a shift fork and a shift rod are disposed in an operating force transmission system on a cover side, and a groove provided on a member on a clutch side and the shift fork. A differential device, wherein the distal end forms a connecting portion of the operating force transmission system, and the distal end of the shift fork engages with the groove of the clutch side member in the process of fixing the cover to the casing body. . 3. The invention according to claim 1, wherein the operating force transmitting system is provided with a gear train, a connecting portion of the operating force transmitting system is formed between the gears, and the cover is cased. A differential device wherein each gear meshes with each other during the process of fixing to a main body. 4. The invention according to claim 1, wherein the electric motor is disposed outside the cover, and an output shaft of the electric motor penetrates the cover. A differential device. 5. The differential device according to claim 4, wherein a recess is provided outside the cover, and the electric motor is disposed in the recess. 6. The differential device according to claim 1, wherein the electric motor is disposed inside the cover. 7. The invention according to claim 1, wherein the differential case comprises an outer case which is rotated by a driving force of the engine, and an outer case which is rotated by a driving force of the engine. An inner case which is arranged to be relatively rotatable inside; a differential mechanism is fixed to the inner case; and a clutch is provided between the outer case and the inner case. A differential device characterized by intermittent driving force. 8. The invention according to claim 1, wherein the clutch is disposed between the differential rotating members of the differential mechanism, and controls the differential rotation of the differential mechanism. A differential device characterized by being locked.