JP2002168271A - Electromagnetic type coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve tightening and fixing function between a cylindrical member and a cover member forming a case-shaped torque transmitting member. SOLUTION: The case-shaped torque transmitting member 3 comprises the cover member 23 made from strengthened material, and the cylindrical member 27 that is arranged so as to divide a magnetic passage of an electromagnet 21 and the cover member 23 and that is made from nonmagnetic material. The cover member 23 and cylindrical member 27 are tightened and fixed by means of a female screw portion 35 and bolt 41, and the female screw portion 35 is further formed in the cover member 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electromagnetic coupling.

[0002]

2. Description of the Related Art "Gaia New Car Manual 0-22 pages, edited by Toyota Motor Corporation, published by the Service Department, 19
The electromagnetic coupling 301 as shown in FIG. 4 is described in “May 29, 1998”.

[0003] The coupling 301 is arranged in a rear wheel-side power transmission system of a four-wheel drive vehicle.
Hub 305, multi-plate main clutch 307 and pilot clutch 309, armature 311, electromagnet 31
3, a cam ring 315, a ball cam 317, a pressure plate 319, a controller, and the like.

[0004] The rotary case 303 is connected from the transfer to the transmission via a propeller shaft. Further, a drive pinion shaft 321 is spline-connected to the hub 305, and a drive pinion gear 3 formed on the drive pinion shaft 321 is formed.
Reference numeral 23 meshes with a ring gear on the side of a rear differential (a differential device that distributes the driving force of the engine to the left and right rear wheels).

[0005] The main clutch 307 includes a rotating case 303.
The pilot clutch 309 is disposed between the rotating case 303 and the cam ring 315.

The ball cam 317 is formed between the cam ring 315 and the pressure plate 319, and the pressure plate 319 is connected to the hub 305.

The rotating case 303 has a main clutch 3
07, the pilot clutch 309, the ball cam 317 and the like are lubricated.

The controller excites the electromagnet 313, controls the excitation current, and stops the excitation.

When the electromagnet 313 is excited, a magnetic loop 325 is generated in the magnetic path, the armature 311 is attracted, and the pilot clutch 309 is pressed. When the pilot clutch 309 is engaged, the rotating case 303 and the hub 3
05 is applied to the ball cam 317 and the generated cam thrust force presses the main clutch 307 via the pressure plate 319 to be engaged.

[0010] When the coupling 301 is connected, the driving force of the engine is sent to the rear wheels, and the vehicle is driven in a four-wheel drive state, so that the running performance on rough roads and the stability of the vehicle body are improved.

When the exciting current of the electromagnet 313 is controlled, the sliding of the pilot clutch 309 causes the ball cam 31 to slip.
7 changes, the coupling force of the main clutch 307 changes, and the driving force of the rear wheels is adjusted.

When the excitation of the electromagnet 313 is stopped, the pilot clutch 309 is released, the cam thrust force of the ball cam 317 disappears, the main clutch 307 is released, the connection of the coupling 301 is released, and the vehicle is brought into a two-wheel drive state. Become.

The rotating case 303 is made of an aluminum alloy in order to prevent the magnetic force from leaking from the magnetic force loop 325 and to reduce the weight of the coupling 301, and is formed in a bolt receiving portion 327 thereof. Stud bolts 331 are respectively provided at a plurality of female screw portions 329.
Is screwed.

An intermediate shaft having a flange is disposed between the rotating case 303 and the transfer-side propeller shaft. This intermediate shaft is made of a shaft steel material, and is fixed to the rotating case 303 by passing each stud bolt 331 through a plurality of holes provided in the flange portion, and screwing a nut to the stud bolt 331. .

[0015]

However, in the coupling 301, in order to connect the rotating case 303 and the intermediate shaft, the thermal expansion coefficient is higher than that of the stud bolt 331 made of structural alloy steel and the intermediate shaft made of steel material for the shaft. Since the female screw portion 329 is provided on the rotating case 303 side of a large aluminum alloy, the fastening force between the stud bolt 331 and the female screw portion 329 has a limit. Therefore, it is difficult to prevent loosening by increasing the tightening force.

Further, in the coupling 301, the axial dimension of the bolt receiving portion 327 is increased to prevent the stud bolt 331 and the female screw portion 329 from being loosened, and the tightening allowance between the female screw portion 329 and the stud bolt 331 is increased. Therefore, the size of the coupling 301 is increased in the axial direction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electromagnetic coupling that is secured in the axial direction and secures a function of fastening and fixing a cover member and a cylindrical member constituting a case-shaped torque transmitting member. .

[0018]

According to the first aspect of the present invention, there is provided an electromagnetic coupling comprising a case-like torque transmitting member, a shaft-like torque transmitting member, a clutch device for transmitting torque therebetween, and the clutch. An electromagnet for controlling transmission torque of the device, a case-shaped torque transmission member is made of a non-magnetic material, and a cylindrical member enclosing the clutch device; A cover member made of a material, wherein the cylindrical member is arranged so as to separate the magnetic path of the electromagnet and the cover member, and presses and fixes the cylindrical member and the cover member to each other for fastening and fixing And a fastening part, which forms a part of the fastening means, is provided on the cover member side.

The case-like torque transmitting member comprises a cylindrical member and a cover member for closing an opening on one side thereof. The cylindrical member is made of a non-magnetic material, and the cover member is made of a strength material. It is made. Further, a shaft member is integrally formed with the cover member made of the strength material, or a shaft member made of the strength material is connected to the cover member.

As described above, in the electromagnetic coupling according to the first aspect, the fastening and fixing portion of the fastening and fixing means for pressing the cylindrical member and the cover member is provided on the strength material cover member side. Aluminum alloy (rotating case 30
3 female screw portion 329) and a strength material (stud bolt 331 of structural alloy steel), unlike the conventional example in which the rotating case 303 and the intermediate shaft are fixed by a screw mechanism. Since the strength is improved, the fastening function between the cylindrical member and the cover member is strengthened.

In this way, the function of the electromagnetic coupling is kept normal for a long time.

Further, while obtaining such an effect, the cylindrical member is made of, for example, an aluminum alloy, thereby preventing leakage of the magnetic force of the electromagnet and reducing the weight of the electromagnetic coupling (cylindrical member). In addition, by forming the cover member and its shaft portion with, for example, a steel material for the shaft, sufficient strength can be obtained and a large driving force can be transmitted.

Further, unlike the conventional example, since the axially long bolt receiving portion 327 is not required, the electromagnetic coupling can be made more compact in the axial direction.

If part or all of the volume reduced by the compactness is used for the oil storage space, the amount of oil that can be sealed in the case-shaped torque transmitting member increases, and each member disposed inside The lubrication / cooling effect and durability of the tire are improved.

Further, since this structure for fastening and fixing the cover member and the cylindrical member can be disassembled, it is possible to replace the member disposed inside the case-shaped torque transmission member, or to replace the electromagnetic cup. Maintenance with disassembly of the ring is easy.

According to a second aspect of the present invention, there is provided the electromagnetic coupling according to the first aspect, wherein the fastening and fixing means is a screw mechanism, and the fastening and fixing portion which is a female screw portion is provided on the cover member side. Thus, the same operation and effect as those of the first aspect can be obtained.

The screw mechanism, which is a fastening and fixing means, is the most commonly used fastening and fixing means. The screw mechanism is capable of firmly fixing the cylindrical member and the cover member with an extremely simple structure, Can be implemented at cost.

Further, since the female thread is provided on the cover member side of the strength material, as described above, the rotating case 303 and the intermediate shaft are connected to each other by the screw mechanism using the female thread 329 of the aluminum alloy and the stud bolt 331 of the strength material. Unlike the conventional example in which the fixing is performed, the strength is greatly improved. Therefore, the fastening function between the cylindrical member and the cover member is enhanced.

For these reasons, the electromagnetic coupling can maintain its normal function for a long time.

In a configuration in which the internal thread does not penetrate the cover member, the case-shaped torque transmitting member (electromagnetic coupling) is easily formed into a sealed structure.

If the electromagnetic coupling has a sealed structure,
Intrusion of foreign substances such as dust and moisture and oil leakage, and the resulting deterioration in function are prevented, and oil is sealed in the case-shaped torque transmission member to lubricate / The cooling effect and durability are greatly improved.

Further, in this configuration in which the female screw portion is provided on the cover member side, a nut is fixed to the cover member (for example, welding).
It includes the form to do.

In this case, it is only necessary to form a through-hole (smooth hole) having no thread in the cover member, and it is not necessary to machine the internal thread, so that the machining cost is reduced accordingly.

According to a third aspect of the present invention, there is provided the electromagnetic coupling according to the second aspect, wherein the female screw portion is formed through the cover member and is screwed through the female screw portion. A nut is screwed onto a bolt for fastening and fixing the cylindrical member and the cover member, and the double nut function prevents slack of the screw mechanism. The same operation and effect as the configuration of claim 2 are obtained. be able to.

Further, the double nut function of the nut screwed to the bolt further improves the slack prevention function of the screw mechanism, prevents the deterioration of the fastening function between the cylindrical member and the cover member, and prevents the electromagnetic coupling. Function is maintained for a long time.

Further, the processing of the female screw portion is simplified by penetrating the cover member, and the processing cost is reduced.

Further, since the function of preventing the screw mechanism from being loosened is improved by the double nut function, the female screw portion can be shortened by a margin and the cover member can be thinned, and the case-shaped torque transmitting member (electromagnetic cup) can be accordingly reduced. Ring) can be shortened in the axial direction and lightened.

According to a fourth aspect of the present invention, there is provided the electromagnetic coupling according to any one of the first to third aspects, wherein the fastening and fixing means is provided within an axial projection range of the case-like torque transmitting member. Therefore, the same operation and effect as those of the first to third aspects can be obtained.

Further, the fastening and fixing means are not provided on, for example, a flange portion formed on the cylindrical member and the cover portion and protruding outward in the radial direction, but are provided within an axial projection range of the case-like torque transmitting member. Thus, it is possible to avoid an increase in the diameter of the case-shaped torque transmission member (electromagnetic coupling) while obtaining the above-described effects by the fastening and fixing means.

Therefore, interference with the peripheral members is less likely to occur, and the layout becomes easier accordingly.

According to the second aspect of the present invention, in the configuration in which the internal thread portion does not penetrate the cover member, the fastening and fixing means does not protrude not only in the radial direction but also in the axial direction.
Interference with peripheral members is further less likely to occur.

[0042]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] An electromagnetic coupling 1 (first embodiment of the present invention) will be described with reference to FIG.

The electromagnetic coupling 1 is characterized in that:
The four-wheel drive vehicle is provided between the rear differential and the engine (transfer) side that are separated during two-wheel drive traveling in a four-wheel drive vehicle. The left and right directions are the left and right directions in FIG. 1, and the right side in FIG. 1 corresponds to the front (engine side) of the vehicle. In addition, members and the like without reference numerals are not shown.

The electromagnetic coupling 1 and the rear differential are arranged in this order in front and rear, and are accommodated in a differential carrier.

The electromagnetic coupling 1 includes a rotating case 3
(Case-like torque transmitting member), fastening / fixing mechanism 5 (fastening / fixing means), inner shaft 7 (axial torque transmitting member), multi-plate type main clutch 9, ball cam 11, pressure plate 13, cam ring 15, multi-plate type pilot Clutch 17, armature 19, electromagnet 21,
It consists of a controller.

The main clutch 9 and the ball cam 1
1, a pressure plate 13, a cam ring 15, a pilot clutch 17, and the like constitute a clutch device.

The rotating case 3 includes a front cover member 23 integrally formed of a shaft steel material (strength material) and a shaft portion 25 thereof, and a cylindrical member formed of an aluminum alloy (non-magnetic material). 27, a rear rotor 29 made of an iron-based alloy (magnetic material) and the like.

A cylindrical portion 31 is formed on the cover member 23, and a flange portion 33 is formed at a front portion of the cylindrical member 27 toward a radially inner side.

The fastening and fixing mechanism 5 includes a bottomed female screw portion 35 (fastening and fixing portion) formed on the cover member 23, a bolt seat 37 and a through hole 39 formed on the flange portion 33 of the cylindrical member 27. It is composed of structural alloy steel bolts 41 and the like. These female thread portion 35, seat 37 and through hole 3
Reference numerals 9 are arranged to face each other in the axial direction, and are formed at a plurality of locations at equal intervals in the circumferential direction.

Assembling of the cover member 23 to the cylindrical member 27 is performed as follows.

First, the cover member 23 is connected to the cylindrical member 27.
The outer periphery of the cylindrical portion 31 and the inner periphery of the flange portion 33 are fitted (in this case, loosely fitted) while aligning the positions of the female screw portion 35 and the through hole 39 from the front side opening of the flange portion 33.
Hit it.

Next, a bolt 41 is passed through the through hole 39 from the rear side opening of the cylindrical member 27, screwed into the female screw portion 35, and tightened with a specified torque, whereby the cover member 23 and the cylindrical member 27 are assembled. finish.

The cover member 23 and the cylindrical member 27 are pressed and fastened to each other by a screw thrust force between the bolt 41 and the female screw portion 35, and the bolt 41 prevents the relative rotation, and the cover member 23 and the flange portion. 3
3 and the screw thrust force, thereby positioning in the axial direction.

Also, between the cover member 23 and the cylindrical member 27, O-rings 43 and 45 for preventing oil leakage are arranged with the fastening and fixing mechanism 5 interposed therebetween.

As described above, since the female screw portion 35 does not penetrate the cover member 23, the fastening and fixing mechanism 5 does not protrude rightward in the axial direction of the rotating case 3.

The fastening and fixing mechanism 5 includes a cylindrical member 27.
By being provided on the flange portion 33 formed toward the inside in the radial direction, the rotating case 3 is arranged within the range projected in the axial direction.

The rotor 29 is screwed into the rear opening of the cylindrical member 27, is centered by the fitting portions 47, and is positioned in the axial direction by the step portion 49 between them. A nut 51 is provided on the rotor 29.
Are screwed, and the double nut function prevents loosening of the screwed portion between the rotor 29 and the cylindrical member 27, thereby enhancing the fixing function.

An O-ring 53 for preventing oil leakage is arranged between the cylindrical member 27 and the rotor 29.

The shaft portion 25 of the cover member 23 protrudes forward from the differential carrier, and is connected to the transfer side via a companion flange connected to the spline portion 55, a joint, a propeller shaft and the like. The driving force of the engine is transmitted to the rotating case 3 via these power transmission systems.

The inner shaft 7 penetrates the rotating case 3 from behind. The front end of the inner shaft 7 is connected to the rotating case 3 (cover member 2) via a ball bearing 57.
3 is supported by the cylindrical portion 31), and the rear end portion is supported by the rotor 29 via the needle bearing 59.
Further, an X-ring 61 having an X-shaped cross section is disposed between the inner shaft 7 and the rotor 29 to prevent oil leakage.

A drive pinion shaft is connected to the spline 63 of the inner shaft 7.
A drive pinion gear is formed on the drive pinion shaft, and the drive pinion gear meshes with a ring gear on the rear differential side. The rotation of the inner shaft 7 is transmitted to the rear differential via these power transmission systems.

The rotating case 3 is provided with the above-mentioned O-rings 43, 4
5, 53 and the X-ring 61 are hermetically sealed. An oil hole 65 formed in the cover member 23 is
The oil hole 65 is sealed by press-fitting a check ball 67 after the oil is injected.

The sealed rotary case 3 prevents foreign matter such as dust and moisture from entering, being caught by foreign matter, freezing moisture, generating rust, and oil leakage.
Function is normally maintained.

At the center of the inner shaft 7, there is provided a capacity increasing space 69 for increasing the internal capacity of the rotating case 3. This capacity increasing space 69 is similar to other portions of the rotating case 3. And the injected oil and air are stored. The capacity increasing space 69 communicates with the main clutch 9 via radial flow paths formed at a plurality of locations on the inner shaft 7.

The main clutch 9 is arranged between the rotating case 3 (cylindrical member 27) and the inner shaft 7, and its outer plate 71 is connected to a spline portion 73 formed on the inner periphery of the cylindrical member 27. The inner plate 75 is connected to a spline 77 formed on the outer periphery of the inner shaft 7.

A pressure receiving ring 79 and a shim 81 are disposed on the right side of the main clutch 9. By changing the thickness of the shim 81, the gap between the plates 71 and 75 is adjusted.

The ball cam 11 is disposed between the pressure plate 13 and the cam ring 15.

The pressure plate 13 has an inner periphery connected to a spline portion 77 of the inner shaft 7.
The main clutch 9 is driven by the thrust force of the ball cam 11.
Is pressed between the rotating case 3 (the pressure receiving ring 79 and the shim 81) to be fastened.

The cam ring 15 is slidably disposed on the outer periphery of the inner shaft 7, and a thrust bearing 83 and a washer 85 which receive a cam reaction force of the ball cam 11 are disposed between the cam ring 15 and the rotor 29. ing.

The pilot clutch 17 is mounted on the rotating case 3
The outer plate 87 is connected to the spline portion 73 of the cylindrical member 27, and the inner plate 89 is connected to a spline portion 91 formed on the outer periphery of the cam ring 15. It is connected to.

The armature 19 is arranged between the pressure plate 13 and the pilot clutch 17, and has its outer periphery connected to the spline 73 of the cylindrical member 27.

The core 93 of the electromagnet 21 has a ring shape.
It penetrates through an appropriate air gap into a ring-shaped concave portion 95 formed in the rotor 29, and is supported on the outer periphery on the small diameter side of the rotor 29 by a double-sided seal type ball bearing 97.

The lead wire 99 of the electromagnet 21 is drawn out of the differential carrier through the grommet and connected to a battery mounted on the vehicle.

The electromagnet 21 (core 93) is connected to the differential carrier via a connecting member and is prevented from rotating.

The sealing function of the ball bearing 97 prevents metal powder and the like contained in the oil of the differential carrier from entering the air gap through the gap between the inner peripheral side of the core 93 and the rotor 29. The rotation resistance is prevented from being applied.

The magnetic path of the electromagnet 21 is constituted by the rotor 29, the pilot clutch 17 and the armature 19.

The rotor 29 is divided into a radially outer side and an inner side by a stainless steel ring 101 which is a non-magnetic material. Each plate 87, 89 of the pilot clutch 17 has a radial position corresponding to the ring 101. And a plurality of notches 103 and these notches 1
A bridge portion connecting the first and third members 03 is provided in the circumferential direction.
The ring 101 and the notch 103 prevent short-circuit of magnetic force on the magnetic path.

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 21, 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 21 is excited, a magnetic force loop 105 is formed in the above magnetic path, the armature 19 is attracted, and the pilot clutch 17 is pressed against the rotor 29 to be fastened.

When the pilot clutch 17 is engaged,
Transmission torque is applied to the ball cam 11 via the cam ring 15 connected to the rotating case 3 via the pilot clutch 17 and the pressure plate 13 on the inner shaft 7 side, and the pressure plate 13 is moved rightward by receiving the generated cam thrust force. Move to the main clutch 9
To be fastened.

When the electromagnetic coupling 1 is connected, the driving force of the engine is transmitted from the inner shaft 7 to the rear differential side, distributed from the rear differential to the left and right rear wheels, and the vehicle is driven in a four-wheel drive state. The running performance of the vehicle and the stability of the vehicle body are improved.

At this time, when the exciting current of the electromagnet 21 is controlled, the pilot clutch 17 slips, the cam thrust force of the ball cam 11 changes, the coupling force of the main clutch 9 changes, and the driving force transmitted to the rear wheels changes. The size changes, and the driving force distribution ratio between the front and rear wheels can be controlled.

For example, if such a control of the driving force distribution ratio is performed during turning, the steering and stability of the vehicle can be greatly improved.

When the excitation of the electromagnet 21 is stopped, the pilot clutch 17 is released, the cam thrust force of the ball cam 11 is lost, the main clutch 9 is released, the connection of the electromagnetic coupling 1 is released, and the rear differential is disconnected. Then, the vehicle enters a two-wheel drive state of front-wheel drive.

The cylindrical member 27 of the rotating case 3 is made of an aluminum alloy, so that the magnetic force of the electromagnet 21 is prevented from leaking to the cylindrical member 27 side, and the magnetic force is efficiently guided to the armature 19. Therefore, the pilot clutch 17 obtains a predetermined torque, and the electromagnetic coupling 1 obtains a predetermined coupling torque.

The oil sealed in the rotating case 3 is
It circulates inside by receiving centrifugal force due to the rotation of the electromagnetic coupling 1, and the main clutch 9, the ball cam 11, the pilot clutch 17, the spline portions 73, 77, 91, the ball bearing 57, the thrust bearing 83, the washer 85, the cam ring. It is supplied to the sliding surface between the inner periphery of the inner shaft 7 and the outer periphery of the inner shaft 7, the X-ring 61 and the like to lubricate and cool them.

The oil in the capacity increasing space 69 flows into the main clutch 9 from each radial flow path of the inner plate 7 due to centrifugal force, and the sliding surface between the outer plate 71 and the inner plate 75 and the spline portion 73,7
7, etc., to further improve the lubrication and cooling effects.

Each inner plate 75 of the main clutch 9 is provided with an oil hole 107 to facilitate the movement of oil to the sliding surface with each of the plates 71 and 73 and to the ball bearing 57 side. Lubrication and cooling effects are further improved.

The pressure plate 13 is provided with an oil hole 109.
The movement resistance of the main clutch 9 (electromagnetic coupling 1) is improved by reducing the movement resistance received by the oil 3 from the oil, the oil is easily moved between the main clutch 9 side and the pilot clutch 17 side, and the ball cam 1
1. The lubrication and cooling effects of the pilot clutch 17, the spline portion 91, the thrust bearing 83, the washer 85, the sliding surface between the cam ring 15 and the inner shaft 7, the X ring 61, etc. are improved.

Thus, the electromagnetic coupling 1 is configured.

As described above, in the electromagnetic coupling 1, the structural alloy steel bolt 41 is screwed into the female screw portion 35 formed on the cover member 23 made of the shaft steel material, and the cover member 23 and the cylindrical member are formed. 27 is fastened and fixed by the female screw 329 of aluminum alloy and the stud bolt 331 of structural alloy steel.
Unlike the conventional example in which the cover member 23 and the intermediate shaft are connected, the strength is greatly improved, and the fastening function of the cover member 23 and the cylindrical member 27 is strengthened.

For the above reasons, the function of the electromagnetic coupling 1 is maintained normally for a long time.

Further, by obtaining the cylindrical member 27 from an aluminum alloy while obtaining such effects, leakage of the magnetic force of the electromagnet 21 can be prevented, and the weight of the electromagnetic coupling (cylindrical member 27) can be reduced. At the same time, by forming the cover member 23 and the shaft portion 25 of the shaft steel material, sufficient strength can be obtained, and a large driving force can be transmitted.

Further, unlike the conventional example, since the bolt receiving portion 327 which is long in the axial direction is not required, the electromagnetic coupling 1 is downsized in the axial direction.

If part or all of the volume reduced by the compacting is used for the oil storage space, the amount of oil that can be sealed in the rotating case 3 increases, and the lubrication and cooling of each member disposed inside the rotary case 3 increase. The effect and durability are improved.

Further, in this configuration in which the cover member 23 and the cylindrical member 27 are fastened and fixed by a screw mechanism, these components can be disassembled, so that the members disposed inside the rotating case 3 can be replaced or the electromagnetic type can be replaced. Maintenance involving disassembly of the coupling 1 is easy.

The screw mechanism is the most commonly used fastening and fixing means. As described above, the cover member 23 and the cylindrical member 27 can be firmly fixed with a simple structure and at a low cost. Can be implemented.

Further, since the female screw portion 35 does not penetrate the cover member 23 and a penetrating portion requiring sealing is not formed, the sealing performance of the electromagnetic coupling 1 is not impaired. Functional deterioration of the electromagnetic coupling 1 due to biting, freezing of water, generation of rust, oil leakage, and the like is prevented.

The fastening and fixing mechanism 5 is connected to the cover member 23.
The cover member 23 and the cylindrical member 27 are stably provided by providing the cover member 23 and the cylindrical member 27 in the axial projection range of the rotary case 3 instead of the flange portion protruding outward in the radial direction of the cylindrical member 27. The diameter of the rotating case 3 (the electromagnetic coupling 1) can be prevented from increasing while obtaining the fixed function.

As described above, the female screw portion 35 does not penetrate the cover member 23 (the bolt 41
In this configuration, the fastening and fixing mechanism 5 does not protrude from the rotating case 3 not only in the radial direction but also in the axial direction.

Therefore, the electromagnetic coupling 1 is less likely to interfere with the differential carrier, and the layout becomes easier.

[Second Embodiment] An electromagnetic coupling 151 (a second embodiment of the present invention) will be described with reference to FIG.

The electromagnetic coupling 151 is provided in claim 1,
It has 2, 3, and 4 features. Hereinafter, differences will be described while giving the same reference numerals to members having the same functions as those of the electromagnetic coupling 1.

The electromagnetic coupling 151 includes a rotating case 3, a fastening and fixing mechanism 153 (fastening and fixing means), an inner shaft 7, a main clutch 9, a ball cam 11, a pressure plate 13, a cam ring 15, a pilot clutch 17, an armature 19, an electromagnet. 21 and a controller.

The fastening and fixing mechanism 153 includes a female screw portion 155 (fastening and fixing portion) formed through the cover member 23, a bolt seat 37 and a through hole 39 formed on the flange portion 33 of the cylindrical member 27. Bolts 157 of structural alloy steel,
It is composed of a structural alloy steel nut 159 (a nut for preventing the screw mechanism from loosening). The female screw portion 155, the seat 37, and the through-hole 39 are disposed to face each other in the axial direction, and are formed at a plurality of positions at equal intervals in the circumferential direction.

The assembly of the cover member 23 to the cylindrical member 27 is performed as follows.

First, the cover member 23 is connected to the cylindrical member 27.
The outer periphery of the cylindrical portion 31 and the inner periphery of the flange portion 33 are loosely fitted to each other while aligning the positions of the female screw portion 155 and the through hole 39 from the front side opening, and abut against the flange portion 33.

Next, a bolt 157 is passed through the through hole 39 from the rear side opening of the cylindrical member 27, screwed into the female screw portion 155, and tightened with a specified torque.
Then, the nut 159 is screwed into the end of the cover member and tightened with a specified torque, whereby the assembly of the cover member 23 and the cylindrical member 27 is completed.

The cover member 23 and the cylindrical member 27 are pressed and fastened to each other by a screw thrust force between the bolt 157 and the female screw portion 155, and the bolt 157 prevents relative rotation. Positioning in the axial direction is performed by the abutment with the screw 33 and the screw thrust force.

The fastening and fixing mechanism 153 is disposed within the range of projection of the rotating case 3 in the axial direction.

A bolt seat 37 formed on the flange portion 33 of the cylindrical member 27 and a head 161 of the bolt 155
If the seal is arranged between the electromagnetic coupling 151 and the female screw 155, the sealing of the electromagnetic coupling 151 is maintained even if the female screw portion 155 penetrates the cover member 23.

Thus, the electromagnetic coupling 151 is formed.

In the electromagnetic coupling 151, bolts 157 made of structural alloy steel are attached to the female threads 155 of the cover member 23.
Is screwed to fasten and fix the cover member 23 and the cylindrical member 27. Unlike the conventional example, the strength is greatly improved, and the fastening function of the cover member 23 and the cylindrical member 27 is strengthened.

Further, the double nut function of the nut 159 further improves the function of preventing the bolt 157 and the female screw portion 155 from loosening and the function of fastening and fixing the cover member 23 and the cylindrical member 27.

For such a reason, the function of the electromagnetic coupling 151 can be normally maintained for a long time.

Further, the female screw portion 155 is
The machining is simplified by penetrating the through holes, and the machining cost is reduced accordingly.

Further, the bolt 15 by the double nut function is used.
7 and the female screw 155 by the amount of the slack prevention effect.
55 can be shortened, and the cover member 23 can be made thinner.
1) can be shortened in the axial direction to reduce the weight.

In addition to this, the differential device 15
1 has the same effect as the electromagnetic coupling 1 of the first embodiment.

[Third Embodiment] The electromagnetic coupling 201 (third embodiment of the present invention) will be described with reference to FIG.

The electromagnetic coupling 201 is described in claim 1
It has two or four features. Hereinafter, differences will be described while giving the same reference numerals to members having the same functions as those of the electromagnetic couplings 1 and 151.

The electromagnetic coupling 201 includes a rotating case 3, a fastening and fixing mechanism 203 (fastening and fixing means), an inner shaft 7, a main clutch 9, a ball cam 11, a pressure plate 13, a cam ring 15, a pilot clutch 17, an armature 19, an electromagnet. 21, a controller and the like.

The fastening and fixing mechanism 203 includes a smooth hole 205 penetrating through the cover member 23, a nut 207 (fastening and fixing portion) of structural alloy steel welded to the cover portion 23 concentrically with the hole 205, and the cylindrical member 27. And a through hole 39 formed on the flange portion 33, a bolt 209 of structural alloy steel, and the like. These smooth holes 20
The nut 5, the nut 207, the seat 37, and the through-hole 39 are arranged to face each other in the axial direction, and are formed at a plurality of locations at equal intervals in the circumferential direction.

The assembly of the cover member 23 to the cylindrical member 27 is performed as follows.

First, the cover member 23 is attached to the cylindrical member 27.
The outer periphery of the cylindrical portion 31 and the inner periphery of the flange portion 33 are loosely fitted to each other while aligning the positions of the smooth hole 205 and the through hole 39 from the front side opening of the above, and abut against the flange portion 33.

Next, a bolt 209 is passed through the through hole 39 and the smooth hole 205 from the rear side opening of the cylindrical member 27, screwed into the nut 207 and tightened with a specified torque, so that the cover member 23 and the cylindrical member 27 Is completed.

The cover member 23 and the cylindrical member 27 are pressed and fastened to each other by the screw thrust force of the bolt 209 and the nut 207 to prevent relative rotation by the bolt 209, and to prevent the cover member 23 and the flange 3 from rotating.
3 and the screw thrust force, and is positioned in the axial direction.

The fastening and fixing mechanism 203 is disposed within the axial projection range of the rotating case 3.

The seat 37 of the flange 33 and the bolt 2
If a seal is arranged between the head and the head 211 of the
Even if 05 penetrates through the cover member 23, the sealing of the electromagnetic coupling 201 is maintained.

Thus, the electromagnetic coupling 201 is configured.

In the electromagnetic coupling 201, the cover member 23 and the cylindrical member 27 are fastened and fixed by the structural alloy steel nut 207 welded to the cover member 23 and the structural alloy steel bolt 209. Unlike this, the strength is greatly improved, and the fastening function of the cover member 23 and the cylindrical member 27 is strengthened.

For the above reasons, the function of the electromagnetic coupling 201 can be normally maintained for a long time.

In addition, since the cover member 23 may be formed with the smooth hole 205 instead of the female screw, the processing cost is reduced.

Further, since the smooth hole 205 penetrates the cover member 23, the processing is further simplified, and the processing cost is reduced.

Also, the bolt 209 and the nut 207
Since a general-purpose product can be used, it can be implemented at extremely low cost while obtaining a strong fastening function.

If the bolt 209 is lengthened and another nut is screwed to the tip, the function of preventing the bolt 209 and the nut 207 from loosening is improved by the double nut function, and the fastening of the cover member 23 and the cylindrical member 27 is improved. The fixed function is kept high.

The cover member 2 which is not machined with a female screw portion
3 eliminates the need to increase the thickness (to lengthen the internal thread portion) in order to give the internal thread portion a desired strength. Therefore, as shown in FIG.
Compared with the thickness at 51, it is possible to make the thickness significantly smaller.

[0137] This thinning makes the electromagnetic coupling 201 (cover member 23) lighter, and prevents the nut 207 from protruding from the axial end of the rotating case 3, thereby preventing interference with peripheral members. Further improve.

In addition to this, the differential device 20
1 has the same effect as the electromagnetic coupling 1 of the first embodiment.

In the structure of the third embodiment in which a smooth hole is provided in the cover member and the cover member and the cylindrical member are fastened and fixed by bolts and nuts, the bolt 209 and the nut 207 of the electromagnetic coupling 201 are not fixed. Alternatively, the bolt 209 may be welded to the cover member, and the nut 207 may be screwed from the inside of the cylindrical member.

The means for fixing the bolt or the nut is not limited to welding, but may be, for example, adhesion.

Further, the bolts and nuts need not be fixed to the cover member.

Further, the electromagnetic coupling of the present invention can be arranged between differential rotating members of a differential device and used for a differential limiting mechanism.

[0143]

In the electromagnetic coupling according to the first aspect, the fastening member, which constitutes the fastening means for fastening the cylindrical member and the cover member, is provided on the cover member side of the strength material. The fastening and fixing portion provided on the side of the cover member has a large strength, and the fastening and fixing function is strengthened, so that the function of the electromagnetic coupling can be normally maintained for a long time.

Further, while obtaining such an effect, by forming the cylindrical member from a light alloy of a non-magnetic material, the leakage of the magnetic force of the electromagnet can be prevented, and the weight of the electromagnetic coupling can be reduced. By forming the cover member from a shaft steel material, a large driving force can be transmitted.

In addition, the need for the bolt receiving portion 327 which is long in the axial direction is eliminated, and the electromagnetic coupling is made compact in the axial direction.

Further, this configuration for fastening and fixing the cover member and the cylindrical member can be disassembled, and replacement of the internal member and maintenance involving disassembly of the electromagnetic coupling are easy.

The electromagnetic coupling according to the second aspect can provide the same effect as that of the first aspect.

The screw mechanism is a universally used fastening and fixing means. The screw mechanism can firmly fasten and fix the cylindrical member and the cover member with an extremely simple structure, and can be implemented at low cost.

Further, since the female screw portion provided on the cover member side of the strength material has high strength, the fastening and fixing function is further enhanced.

In the case where the female screw does not penetrate the cover member, the case-shaped torque transmitting member (electromagnetic coupling) is easily sealed.

The electromagnetic coupling according to the third aspect can provide the same effect as that of the second aspect.

Further, the function of preventing the screw mechanism from being loosened is further improved by the double nut function, and the function of the electromagnetic coupling is maintained normally for a long time.

Further, the female screw portion penetrating the cover member is simple in processing, and the processing cost is reduced.

[0154] Further, by the effect of preventing the loosening of the double nut function, the female screw portion can be shortened, and the cover member can be made thinner, so that the electromagnetic coupling is shortened in the axial direction and the weight is reduced.

The electromagnetic coupling according to the fourth aspect can provide the same effects as those of the first to third aspects.

Further, by providing the fastening and fixing means within the axial projection range of the case-shaped torque transmitting member, the case-shaped torque transmitting member (electromagnetic coupling) can be obtained while obtaining the above-mentioned effects of the fastening and fixing means. Is avoided, interference with peripheral members is less likely to occur, and layout is facilitated.

Further, in a configuration in which the female screw portion does not penetrate the cover member, the fastening and fixing means does not protrude in both the radial direction and the axial direction of the case-like torque transmitting member.
Interference with peripheral members is further less likely to occur.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment.

FIG. 2 is a sectional view showing a second embodiment.

FIG. 3 is a sectional view showing a third embodiment.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 electromagnetic coupling 3 rotating case (case-like torque transmitting member) 5 fastening / fixing mechanism (fastening / fixing means) 7 inner shaft (axial torque transmitting member) 9 main clutch (clutch device) 11 ball cam (clutch device) 13 pressure plate (Clutch device) 15 Cam ring (clutch device) 17 Pilot clutch (clutch device) 21 Electromagnet 23 Cover member made of high-strength material 27 Cylindrical member made of non-magnetic material 35 Covered bottom formed on cover member 23 Female thread portion (fastening fixing portion) 41 Bolt for fastening and fixing cover member 23 and cylindrical member 27 151 Electromagnetic coupling 153 Fastening fixing mechanism (fastening fixing means) 155 Female screw portion (fastening fixing portion) 157 penetrating cover member 23 Fastening and fixing the cover member 23 and the cylindrical member 27 Bolt 159 Nut for double nut to prevent loosening of female screw portion 155 and bolt 157 (screw mechanism) 201 Electromagnetic coupling 203 Fastening / fixing mechanism (fastening / fixing means) 207 Nut welded to cover member 23 (fastening / fastening portion) 209) Bolt for fastening and fixing cover member 23 and cylindrical member 27

Claims (4)

[Claims] 1. A case-like torque transmitting member comprising: a case-like torque transmitting member; an axial torque transmitting member; a clutch device for transmitting torque therebetween; and an electromagnet for controlling a transmitting torque of the clutch device. Has a cylindrical member made of a non-magnetic material and enclosing the clutch device, and a cover member made of a strength material arranged to close one opening of the cylindrical member, and the cylindrical member is A fastening and fixing part which is arranged so as to divide the magnetic path of the electromagnet and the cover member, presses and fastens the cylindrical member and the cover member to each other, and forms a part of the fastening and fixing means Is provided on the cover member side. 2. The electromagnetic type according to claim 1, wherein the fastening and fixing means is a screw mechanism, and the fastening and fixing part, which is a female screw part, is provided on the cover member side. Coupling. 3. The invention according to claim 2, wherein the female screw portion is formed through the cover member, and is screwed through the female screw portion to connect the cylindrical member and the cover member. An electromagnetic coupling in which a nut is screwed onto a bolt to be fastened and fixed, and the double nut function prevents loosening of the screw mechanism. 4. The electromagnetic type according to claim 1, wherein the fastening and fixing means is provided within an axial projection range of the case-shaped torque transmitting member. Coupling.