JP2002235774A - Electromagnetic coupling - Google Patents

Abstract

PROBLEM TO BE SOLVED: To free a coupling function between a shaft member and a cylindrical member forming a case-like torque transmitting member from the influence of a temperature variation. SOLUTION: The case-like torque transmitting member 3 includes the shaft member 25 for transmitting torque, and the non-magnetic cylindrical member 27 disposed to separate a magnetic path of an electromagnet 23 from the shaft member 25. The shaft member 25 and the cylindrical member 27 are engaged with each other by engaging parts 37, 41 so as not to rotate relative to each other, and are locked axially by a stepped part 5 and a snap ring 7.

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
"May 29, 1998" describes an electromagnetic coupling 1001 as shown in FIG.

[0003] The coupling 1001 is arranged in a rear wheel-side power transmission system of a four-wheel drive vehicle.
3, hub 1005, multi-plate main clutch 1007 and pilot clutch 1009, armature 1011
Electromagnet 1013, cam ring 1015, ball cam 10
17, a pressure plate 1019, a controller and the like.

[0004] The rotary case 1003 is connected from the transfer to the transmission via a propeller shaft. A drive pinion shaft 1021 is spline-connected to the hub 1005, and a drive pinion gear 1023 formed on the drive pinion shaft 1021 is a ring on the side of a rear differential (a differential device for distributing the driving force of the engine to the left and right rear wheels). It is in mesh with the gear.

[0005] The main clutch 1007 is
03 and the hub 1005, and the pilot clutch 1009 is disposed between the rotating case 1003 and the cam ring 1015.

The ball cam 1017 is a cam ring 1015
And the pressure plate 1019, and the pressure plate 1019 is connected to the hub 1005.

The rotating case 1003 includes a main clutch 1007, a pilot clutch 1009, a ball cam 1
Oil for lubricating 017 etc. is enclosed.

The controller controls the excitation of the electromagnet 1013,
Controls the excitation current and stops excitation.

When the electromagnet 1013 is excited, a magnetic loop 1025 is generated in the magnetic path, the armature 1011 is attracted, and the pilot clutch 1009 is pressed. When pilot clutch 1009 is engaged, rotating case 10
A torque between the hub 03 and the hub 1005 is applied to the ball cam 1017, and the generated cam thrust force presses the main clutch 1007 via the pressure plate 1019 to be engaged.

[0010] When the coupling 1001 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.

When the exciting current of the electromagnet 1013 is controlled,
The cam thrust force of the ball cam 1017 changes due to the slip of the pilot clutch 1009, and the main clutch 1
The connection force of 007 changes, and the driving force of the rear wheel is adjusted.

When the excitation of the electromagnet 1013 is stopped, the pilot clutch 1009 is released and the ball cam 101 is released.
7 loses the cam thrust force and the main clutch 1007
Is released and the connection of the coupling 1001 is released,
The vehicle enters the two-wheel drive state.

The rotating case 1003 is made of an aluminum alloy to prevent the magnetic force from leaking from the magnetic force loop 1025 and to reduce the weight of the coupling 1001, and is formed in a bolt receiving portion 1027 thereof. Stud bolts 1031 are screwed into the plurality of threaded portions 1029, respectively.

An intermediate shaft having a flange is disposed between the rotating case 1003 and the transfer-side propeller shaft. This intermediate shaft is made of a shaft steel material, and is fixed to the rotating case 1003 by passing each stud bolt 1031 through a plurality of holes provided in a flange portion, and screwing a nut to the stud bolt 1031. .

[0015]

However, in the coupling 1001, in order to connect the rotary case 1003 and the intermediate shaft, the stud bolt 1031 made of structural alloy steel and the intermediate shaft made of a steel material for the shaft are heated. Aluminum alloy rotating case 10 with large expansion coefficient
Since the screw portion 1029 is provided on the side of the rotating case 1003 and the temperature rises during operation, the rotating case 1003 and the stud bolt 10
The screw portion 1029 and the stud bolt 1031 are loosened due to the difference in thermal expansion between the rotating case 1003 and the stud bolt 103 due to the difference in thermal expansion between the rotating case 1003 and the intermediate shaft.
1 may be subjected to bending stress, and the connection function between the rotating case 1003 and the intermediate shaft may be reduced.

However, due to the strength problem of the aluminum alloy, the stud bolt 1031 and the screw portion 102
Since there is a limit in the tightening force of the screw 9, it is difficult to increase the tightening force to prevent loosening.

Also, in the coupling 1001, the axial dimension of the bolt receiving portion 1027 is increased in order to prevent the stud bolt 1031 from loosening and the screw portion 1029, and the tightening allowance between the screw portion 1029 and the stud bolt 1031 is increased. Therefore, the size of the coupling 1001 is increased in the axial direction.

Further, in the configuration using a screw for connecting the rotating case 1003 and the intermediate shaft, since the processing of the screw portion 1029 and the screw member (stud bolt 1031) are required, the number of processing steps, the number of parts, and the assembling step are reduced accordingly. More and more expensive.

Therefore, according to the present invention, the connecting function between the shaft member and the cylindrical member constituting the case-shaped torque transmitting member is released from the influence of temperature change, the number of parts is reduced, and the axial direction is made compact. The purpose is to provide an electromagnetic coupling.

[0020]

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 the transmission torque of the device, a case-shaped torque transmission member including a shaft member for torque transmission, a clutch device, and a non-magnetic member arranged so as to separate the magnetic path of the electromagnet from the shaft member; A cylindrical member having a body, wherein the shaft member and the cylindrical member are non-rotatably engaged with each other by an engaging portion, and are axially locked by locking means including a snap ring. I do.

As described above, in the electromagnetic coupling according to the first aspect, the shaft member and the cylindrical member constituting the case-shaped torque transmitting member are engaged with the engagement member so that they cannot rotate relative to each other. It is locked in the axial direction by locking means including.

Therefore, unlike the conventional example in which the rotating case 1003 and the intermediate shaft are connected by a screw portion, the connecting function between the shaft member and the cylindrical member is released from the influence of the temperature change, and the connecting function is reduced. This prevents the electromagnetic coupling from functioning for a long time.

Further, while obtaining such an effect, the cylindrical member is made of, for example, an aluminum alloy to prevent leakage of the magnetic force of the electromagnet and to reduce the weight of the electromagnetic coupling (cylindrical member). can do.

Further, by forming the shaft member from, 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 bolt receiving portion 1027 which is long in the axial direction is not required, the electromagnetic coupling can be downsized in the axial direction.

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

Further, since the processing of the screw portion 1029 and the stud bolt 1031 are required, the number of processing steps, the number of parts,
The number of assembling steps is reduced accordingly, and the configuration can be made at low cost.

Further, in this configuration, the shaft member and the cylindrical member are engaged with each other and locked in the axial direction by the locking means.
Since the shaft member and the cylindrical member can be disassembled, replacement of a member disposed inside the case-shaped torque transmitting member and maintenance involving disassembly of the electromagnetic coupling are easy.

According to a second aspect of the present invention, there is provided the electromagnetic coupling according to the first aspect, wherein the engagement portion between the shaft member and the cylindrical member is provided between the inner periphery of the cylindrical member and the shaft member. Are provided, and the same operation and effect as the configuration of claim 1 can be obtained.

Further, in this configuration in which the shaft member and the cylindrical member are engaged with each other by the spline portion, the assembling work and the disassembling work are easy, and these working costs are reduced.

The spline formed on the inner periphery of the cylindrical member and the spline engaged with the spline have a large diameter, so that a large driving force can be transmitted.

Further, if the spline portion is shared by engaging the shaft member with the spline portion with which the plate of the clutch device disposed inside the cylindrical member engages, the assembling of the shaft member to the cylindrical member and other operations can be performed. Since the assembly of the members can be performed by a series of operations, the assembly becomes easier and the assembly cost is further reduced.

Further, since the shaft member and the cylindrical member are engaged with each other, it is not necessary to process another spline portion, and the processing cost is further reduced.

According to a third aspect of the present invention, there is provided the electromagnetic coupling according to the first or second aspect, wherein the means for locking the shaft member and the cylindrical member includes the shaft member and the cylindrical member. A stepped portion that abuts each other in the assembly direction,
It is characterized by comprising a snap ring for preventing detachment in the opposite direction to the assembling, and the same operation and effect as the configuration of claim 1 or 2 can be obtained.

Further, in this configuration, after the shaft member and the cylindrical member are abutted at the step, a snap ring is attached between the shaft member and the cylindrical member to thereby assemble the shaft member and the cylindrical member. Attachment is completed.

When the abutment of the step portion is not used, the shaft member and the cylindrical member must be positioned using the snap ring even on the inner peripheral side of the cylindrical member. Work is not easy.

However, in this configuration, since the shaft member and the cylindrical member abut against each other, there is no need to perform a snap ring mounting operation on the inner periphery of the cylindrical member. Therefore, the assembly of the shaft member and the cylindrical member is not required. The attaching work is extremely easy.

Further, only one snap ring is required, and the number of parts is reduced.

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 a seal is provided between the cylindrical member and the shaft-like torque transmitting member, The engagement portion between the shaft member and the cylindrical member is disposed outside the case-shaped torque transmission member from the seal portion, and the same operation and effect as those of the first to third aspects can be obtained.

Further, by the above-described features of the present invention, the axial play between the cylindrical member and the shaft member constituting the case-like torque transmitting member is minimized.
In this configuration, the seal portion is disposed not between the shaft member and the shaft-shaped torque transmitting member but between the cylindrical member and the shaft-shaped torque transmitting member. Is completely released from the axial play, and the axial play between the shaft member and the axial torque transmitting member is prevented from being input to the seal portion, so that the durability of the seal portion is greatly improved.

Further, by disposing the engaging portion between the shaft member and the cylindrical member outside the seal portion, the shaft member and the cylindrical member can be attached and detached without affecting the seal portion. That improves the ease of assembly and maintenance.

According to a fifth aspect of the present invention, there is provided an electromagnetic coupling which controls a case-like torque transmitting member, a shaft-like torque transmitting member, a clutch device for transmitting torque therebetween, and a transmission torque of the clutch device. A case-shaped torque transmitting member, a shaft member for torque transmission, a non-magnetic cylindrical member enclosing the clutch device, and arranged by dividing the magnetic path of the electromagnet and the shaft member. A cylindrical member is cast into the shaft member to be integrated, and the cast portion is provided with an uneven portion between the shaft member and the cylindrical member, which makes relative rotation impossible. It is characterized by.

As described above, in the electromagnetic coupling according to the fifth aspect, the cylindrical member is integrated with the shaft member by casting the same into the shaft member. An uneven portion that disables relative rotation between them is provided therebetween.

Therefore, unlike the conventional example, the connecting portion (casting portion) between the shaft member and the cylindrical member is released from the influence of the temperature change and the deterioration of the connecting function is prevented, so that the normal function is maintained for a long period of time. Dripping.

Further, while obtaining such an effect, by using, for example, an aluminum alloy casting material for the cylindrical member, it is possible to prevent the leakage of the magnetic force of the electromagnet,
The electromagnetic coupling (cylindrical member) can be reduced in weight.

Further, by forming the shaft member from, for example, a steel material for the shaft, sufficient strength can be obtained and a large driving force can be transmitted.

The bolt receiving portion 1027 which is long in the axial direction
If the electromagnetic coupling is made compact in the axial direction, and part or all of the reduced volume is used for the oil storage space, the amount of oil that can be sealed in the case-shaped torque transmission member And the lubrication / cooling effect and durability of each member arranged inside are improved.

Further, the processing of the screw portion 1029 and the stud bolt 1031 become unnecessary, so that the number of processing steps, the number of parts, and the number of assembling steps are reduced, and the cost is reduced.

Since the aluminum alloy cylindrical member is cast rather than cut, the casting (by casting the cylindrical member into the shaft member) allows the relative rotation of the shaft member and the cylindrical member. Preventive measures are taken simultaneously.

As described above, since the assembling work of the shaft member and the cylindrical member and the engaging work and the locking work for preventing the relative rotation thereof are not required, the execution cost is greatly reduced.

[0051]

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:
It is provided between the rear differential and the engine (transfer) side which 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 the front-rear direction, and are accommodated in a differential carrier.

The electromagnetic coupling 1 includes a rotating case 3
(Case-shaped torque transmitting member), step 5 (locking means),
Snap ring 7 (locking means), inner shaft 9
(Axial torque transmitting member), multi-plate type main clutch 1
1, a ball cam 13, a pressure plate 15, a cam ring 17, a multi-plate pilot clutch 19, an armature 21, an electromagnet 23, a controller, and the like.

Also, the main clutch 11, the ball cam 1
3, a pressure plate 15, a cam ring 17, a pilot clutch 19 and the like constitute a clutch device.

The rotating case 3 includes a front power transmission shaft 25 (shaft member) made of a shaft steel material, a cylindrical member 27 made of an aluminum alloy (non-magnetic material), and an iron alloy ( (A magnetic material).

A cover 31 is formed integrally with the power transmission shaft 25, and a cylindrical portion 33 is provided on the outer peripheral side of the cover 31.
Is formed, and a flange portion 35 is formed on the outer peripheral side. A spline portion 37 (engaging portion) is formed on the outer periphery of the flange portion 35.

A flange portion 39 is formed at the front portion of the cylindrical member 27 toward the inside in the radial direction, and a spline portion 41 (engaging portion) is formed on the inner periphery of the cylindrical member 27 on the rear side. It is formed up to the opening.

The step 5 is formed between the flange 35 of the power transmission shaft 25 and the flange 39 of the cylindrical member 27.

The power transmission shaft 25 fits the outer periphery of the cylindrical portion 33 and the inner periphery of the flange portion 39 from the rear opening of the cylindrical member 27 while engaging the spline portion 37 with the spline portion 41 (see FIG. 3). In this case, the flange portion 35 is moved until the flange portion 39 abuts (the step portion 5 abuts) while loosely fitting), and then the snap ring 7 is attached to the cylindrical portion 33 that has come out, and the positioning is performed.
The assembly to the cylindrical member 27 is completed.

The power transmission shaft 25 and the cylindrical member 27 are prevented from rotating relative to each other by engagement of the spline portions 37 and 41, and are positioned in the axial direction by the step portion 5 and the snap ring 7.

An O-ring 43 for preventing oil leakage is arranged between the cylindrical portion 33 of the power transmission shaft 25 and the flange portion 39 of the cylindrical member 27.

The rotor 29 is screwed into the rear opening of the cylindrical member 27, is centered by the fitting portions 45, and is positioned in the axial direction by the step 47 between them. A nut 49 is attached to the rotor 29.
Is screwed into the rotor 29 by its double nut function.
And the screwing portion of the cylindrical member 27 is prevented from loosening, and the fixing function is enhanced.

An O-ring 51 is arranged between the cylindrical member 27 and the rotor 29 to prevent oil leakage.

The power transmission shaft 25 protrudes forward from the differential carrier, and is connected to the transfer side via a companion flange connected to the spline portion 53, 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 9 penetrates the rotating case 3 from behind. The front end of the inner shaft 9 is connected to the rotating case 3 (the cylindrical portion 33) via the ball bearing 55.
The rear end is supported by a rotor 29 via a needle bearing 57. An X-ring 59 having a cross section of an X-shape is disposed between the inner shaft 9 and the rotor 29 to prevent oil leakage.

A drive pinion shaft is connected to the spline portion 61 of the inner shaft 9.
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 9 is transmitted to the rear differential via these power transmission systems.

The rotating case 3 is provided with the O-rings 43 and 51 described above.
And an X ring 59, into which oil is injected from an oil hole 63 formed in the cover portion 31 of the power transmission shaft 25. After the oil is injected, the oil hole 63 65 is press-fitted and sealed.

At the center of the inner shaft 9, there is provided a capacity increasing space 67 for increasing the internal capacity of the rotating case 3, and this capacity increasing space 67 is similar to other portions of the rotating case 3. And the injected oil and air are stored. Further, the capacity increasing space portion 67 is formed in the main clutch 11 by a radial flow path 69 formed at a plurality of locations.
Communicates with the side.

The main clutch 11 is disposed between the rotating case 3 (cylindrical member 27) and the inner shaft 9, and its outer plate 71 is connected to the spline portion 41 of the cylindrical member 27, and the inner plate 73 Is a spline portion 7 formed on the outer periphery of the inner shaft 9.
5.

A pressure receiving ring 77 is disposed on the right side of the main clutch 11, and its outer periphery is connected to the spline portion 41. The gap between the plates 71 and 73 is adjusted by replacing the pressure receiving plate 77 with a plate having a different thickness.

The ball cam 13 is disposed between the pressure plate 15 and the cam ring 17.

The pressure plate 15 has an inner periphery connected to a spline portion 75 of the inner shaft 9.
The main clutch 1 is driven by the thrust force of the ball cam 13.
1 is pressed between the rotating case 3 (pressure receiving ring 77),
Let it be fastened.

The cam ring 17 is slidably disposed on the outer periphery of the inner shaft 9, and a thrust bearing 79 and a washer 81 which receive a cam reaction force of the ball cam 13 are disposed between the cam ring 17 and the rotor 29. ing.

The pilot clutch 19 is mounted on the rotating case 3
The outer plate 83 is connected to the spline 41 of the cylindrical member 27, and the inner plate 85 is connected to the spline 87 formed on the outer periphery of the cam ring 17. It is connected to.

The armature 21 is disposed between the pressure plate 15 and the pilot clutch 19, and has an outer periphery connected to the spline portion 41 of the cylindrical member 27.

The core 89 of the electromagnet 23 has a ring shape.
It penetrates through a suitable air gap into a ring-shaped concave portion 91 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 93.

The groove 95 provided in the core 89 has
A dust cover 97 is engaged with its leg 99 to prevent rotation. The lead wire 101 of the electromagnet 23 is wired along the inside of the dust cover 97, drawn out of the differential carrier through the grommet, and connected to a vehicle-mounted battery.

The dust cover 97 is connected to the differential carrier side and keeps the electromagnet 23 (core 89) from rotating.

By the sealing function of the ball bearing 93, metal powder and the like contained in the oil of the differential carrier penetrate into the air gap from the gap between the inner peripheral side of the core 89 and the rotor 29, and a rotational resistance is applied to the rotating case 3. That has been prevented.

A magnetic path of the electromagnet 23 is constituted by the rotor 29, the pilot clutch 19 and the armature 21.

The rotor 29 is divided radially outward and inward by a stainless steel ring 103 which is a non-magnetic material.
3, 85 at the radial position corresponding to the ring 103,
A plurality of notches 105, and these notches 105
Are provided in the circumferential direction. The ring 103 and the notch 105 prevent a 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 23, the control of the excitation current, the stop of the excitation, and the like according to the road surface condition.

When the electromagnet 23 is excited, a magnetic force loop 107 is formed in the above magnetic path, the armature 21 is attracted, and the pilot clutch 19 is pressed against the rotor 29 to be engaged.

When the pilot clutch 19 is engaged,
The transmission torque is applied to the ball cam 13 via the cam ring 17 connected to the rotating case 3 via the pilot clutch 19 and the pressure plate 15 on the inner shaft 9 side, and the pressure plate 15 receives the generated cam thrust force to move the pressure plate 15 to the right. Move to the main clutch 1
Press 1 to fasten.

When the electromagnetic coupling 1 is connected, the driving force of the engine is transmitted from the inner shaft 9 to the rear differential via a rear propeller shaft or the like, and is distributed from the rear differential to the left and right rear wheels. The wheel drive state is established, and the running performance on rough roads and the stability of the vehicle body are improved.

At this time, when the exciting current of the electromagnet 23 is controlled, the pilot clutch 19 slips, the cam thrust force of the ball cam 13 changes, and the main clutch 11
And the magnitude of the driving force sent to the rear wheels changes, so that 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 a turning operation, the controllability and stability of the vehicle can be greatly improved.

When the excitation of the electromagnet 23 is stopped, the pilot clutch 19 is released, the cam thrust force of the ball cam 13 disappears, the main clutch 11 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.

Further, the cylindrical member 27 of the rotating case 3 is made of an aluminum alloy, so that the magnetic force of the electromagnet 23 is prevented from leaking to the cylindrical member 27 side, and the magnetic force is efficiently guided to the armature 21. Therefore, the pilot clutch 19 obtains a predetermined torque, and the electromagnetic coupling 1 obtains a predetermined coupling torque.

A ring-shaped capacity increasing space 109 is formed in the cylindrical portion 33 of the power transmission shaft 25 to increase the amount of oil that the rotating case 3 can hold.

The cylindrical portion 33 has a capacity increasing space 1
09 and the ball bearing 55, and oil flow paths 111 for guiding oil to the ball bearing 55 are formed at a plurality of locations.

The oil sealed in the rotating case 3 is
Circulates inside by the centrifugal force of the electromagnetic coupling 1,
Main clutch 11, ball cam 13, pilot clutch 19, spline portions 41, 75, 87, ball bearing 55, thrust bearing 79, washer 81,
It is supplied to the sliding surface between the inner circumference of the cam ring 17 and the outer circumference of the inner shaft 9, the X-ring 59, etc.
Cooling.

The oil in the capacity increasing space 67 flows into the main clutch 11 from each flow path 69 by centrifugal force, and is given to the sliding surface between the outer plate 71 and the inner plate 73 to provide lubrication and cooling effects. Has been further improved.

Each inner plate 73 of the main clutch 9 is provided with an oil hole 113 to facilitate the movement of oil to the sliding surface with each plate 71, 73 and to the ball bearing 55 side. Improved lubrication and cooling effects.

Further, the lubrication and cooling effects of the ball bearing 55 are controlled by the oil passage 111 through the capacity increasing space 10.
It is further improved by the oil provided from 9.

Thus, the electromagnetic coupling 1 is configured.

As described above, in the electromagnetic coupling 1, the power transmission shaft 25 and the cylindrical member 27 constituting the rotating case 3 are engaged with the cylindrical member 27 by the spline portions 37 and 41 so that they cannot rotate relative to each other. 5 and snap ring 7
And these are positioned in the axial direction.

Therefore, unlike the conventional example, the power transmission shaft 25
The connection function of the cylindrical member 27 and the cylindrical member 27 is released from the influence of the temperature change, and the deterioration of the connection function is prevented, so that the electromagnetic coupling 1 can maintain the normal function for a long time.

By making the cylindrical member 27 of an aluminum alloy while obtaining such an effect, the leakage of the magnetic force of the electromagnet 23 is prevented and the electromagnetic coupling 1 (cylindrical member 27) is formed. Weight is reduced.

Further, by forming the power transmission shaft 25 from a 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 727 which is long in the axial direction is unnecessary, the electromagnetic coupling 1 can be downsized in the axial direction.

Further, since a part of the volume reduced by the compacting is made into the capacity increasing space portion 109 which is an oil accommodating space, the amount of oil that can be sealed in the rotating case 3 increases, and the rotating case 3 is disposed inside. The lubricating / cooling effect and durability of each member thus improved are improved.

Further, unlike the conventional example, since the processing of the screw portion 729 and the stud bolt 731 are required, the number of processing steps, the number of parts, and the number of assembling steps are reduced, and the cost is reduced.

In this configuration, the power transmission shaft 25 and the cylindrical member 27 are engaged with each other by the spline portions 37 and 41 and are positioned in the axial direction by the step portion 5 and the snap ring 7. Since the member 27 can be disassembled, the members disposed inside, for example, the plate 7
1, 73, 83, 85, bearings 55, 57, 79, etc., and maintenance of the electromagnetic coupling 1 accompanied by disassembly is easy.

Further, this configuration in which the power transmission shaft 25 and the cylindrical member 27 are engaged with each other by the spline portions 37 and 41 facilitates the assembling work and the disassembling work.
Each operation cost is reduced.

Further, the spline portion 41 formed on the inner periphery of the cylindrical member 27 and the spline portion 37 engaged with the spline portion 41 are formed.
Since has a large diameter, a sufficient torque transmission capacity can be obtained and a large driving force can be transmitted.

The spline portion 41 of the power transmission shaft 25 is attached to the spline portion 41 where the outer plates 71 and 83 of the main clutch 11 and the pilot clutch 19 engage.
And the spline portion 41 is shared, so that the assembling of the power transmission shaft 25 to the cylindrical member 27 and the assembling of the main clutch 11 and the pilot clutch 19 can be performed by a series of operations. It is easy and the assembly cost is further reduced.

Further, since the power transmission shaft 25 and the cylindrical member 27 are engaged with each other, it is not necessary to machine another spline portion, and the machining cost is further reduced.

Further, the assembling of the power transmission shaft 25 and the cylindrical member 27 is completed only by attaching the snap ring 7 to the power transmission shaft 25 outside after abutting them at the stepped portion 5. Since there is no need to perform the work of attaching the snap ring on the inner periphery of the shaped member 27, the assembly work is extremely easy.

Further, only one snap ring 7 is used, and the number of parts is reduced.

[Second Embodiment] Next, referring to FIGS. 2 and 3, an electromagnetic coupling 201 (a second embodiment of the present invention) will be described.
I will explain.

This electromagnetic type coupling 201 is described in claim 5
It has the following 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. Note that the right side of FIG. 2 corresponds to the front of the vehicle (engine side), and members without reference numerals and the like are not shown.

The electromagnetic coupling 201 comprises a rotating case 3, an inner shaft 9, and a multi-plate main clutch 1.
1, a ball cam 13, a pressure plate 15, a cam ring 17, a multi-plate pilot clutch 19, an armature 21, an electromagnet 23, a controller, and the like.

A cover portion 203 and a cylindrical portion 205 are formed on the power transmission shaft 25 of the rotating case 3.

A flange 207 is formed on the outer periphery of the cover 203. As shown in FIG. 3, semicircular recesses 209 are formed in the flange 207 at regular intervals in the circumferential direction. .

As shown in FIG. 2, the cylindrical member 27 is cast so that the flange 39 wraps the flange 207 of the power transmission shaft 25 from the front and back, and is integrated with the power transmission shaft 25.

Prior to the casting, the power transmission shaft 25 has a cover 203, a cylindrical portion 205, and a flange 20.
7, the recess 209 and the like are processed. In addition, the cylindrical member 2
7, after casting, the spline portion 41 is processed, and the outer periphery and the like are finished.

The power transmission shaft 25 and the cylindrical member 27 integrated with each other rotate relative to each other due to the engagement between the concave portion 209 of the power transmission shaft 25 and the convex portion 211 formed on the cylindrical member 27 when cast. The flange 207
Are positioned in the axial direction by the abutment between the abutting portions 213 and 215 formed before and after the flange portion and the flange portion 207.

Further, the cylindrical portion 205 supports the front end of the inner shaft 9 by a ball bearing 55 disposed on the inner periphery.

Oil is injected into the rotating case 3 from an oil hole 63 formed in the cover 203, and after the oil is injected, the oil hole 63 is sealed by press-fitting a check ball 65.

The cylindrical member 205 has a cylindrical member 27.
Are formed at a plurality of locations. The oil flow passages 219 communicate with the ball bearing 55 and the capacity increasing space portion 217 formed between them and guide oil to the ball bearing 55.

Thus, the electromagnetic coupling 201 is configured.

In the electromagnetic coupling 201, as described above, the power transmission shaft 25 and the cylindrical member 27 are integrated by casting the cylindrical member 27 into the power transmission shaft 25. The engagement between the concave portion 209 and the convex portion 211 prevents relative rotation, and
Positioning in the axial direction is achieved by abutment between the flange portion 215 and the flange portion 207.

Therefore, the power transmission shaft 25 and the cylindrical member 27
The connection portion (cast portion) is released from the influence of a temperature change as in the conventional example, and the deterioration of the connection function is prevented, so that the electromagnetic coupling 201 can maintain its normal function for a long time.

Further, by obtaining the cylindrical member 27 from an aluminum casting alloy while obtaining such an effect, the leakage of the magnetic force of the electromagnet 23 is prevented and the electromagnetic coupling 201 (the cylindrical member 27) is formed. ) Is lighter.

Further, by forming the power transmission shaft 25 from a steel material for the shaft, sufficient strength can be obtained and a large driving force can be transmitted.

Further, since the bolt receiving portion 727 which is long in the axial direction is unnecessary, the electromagnetic coupling 201 can be downsized in the axial direction.

Further, by making a part of the volume reduced by this compacting into the capacity increasing space portion 217 which is an oil accommodating space, the amount of oil that can be sealed in the rotating case 3 is increased, and each of the oil tanks arranged inside is The lubrication / cooling effect and durability of the member are improved.

Further, the processing of the screw portion 729 and the stud bolt 731 are required, so that the number of processing steps, the number of parts, and the number of assembling steps are reduced accordingly, and the cost is reduced.

The aluminum alloy cylindrical member 2
Reference numeral 7 denotes a material which is not formed by shaving but is originally cast. However, this casting (casting the cylindrical member 27 into the power transmission shaft 25) prevents the relative rotation between the power transmission shaft 25 and the cylindrical member 27. Since the countermeasure and the axial positioning countermeasure are performed simultaneously, not only the assembling work of the power transmission shaft 25 and the cylindrical member 27 but also the engaging work and the locking work for preventing their relative rotation become unnecessary. And implementation costs are greatly reduced.

In the invention according to claim 5, the irregularities between the shaft member and the cylindrical member provided in the casting portion are not limited to the shape as in the second embodiment (electromagnetic coupling 201).

FIGS. 4, 5, and 6 show examples of uneven portions having other shapes. These figures correspond to the AA cross section of the electromagnetic coupling 201 shown in FIG.

Hereinafter, each example will be described with reference to the members of the electromagnetic coupling 201 shown in FIG.

In each of the examples of FIGS. 4, 5 and 6, a cover 203 and a cylindrical portion 205 are formed on the power transmission shaft 25, and a flange 207 is formed on the outer periphery of the cover 203. I have.

[0136] The cylindrical member 27 is cast so that the flange portion 39 wraps the flange portion 207 of the power transmission shaft 25 from front and rear, and is integrated with the power transmission shaft 25.

In the example of FIG. 4, a large number of recesses 231 are formed on the outer periphery of the flange portion 207 at equal intervals in the circumferential direction.

The power transmission shaft 25 and the cylindrical member 27 are prevented from rotating relative to each other by the engagement between the concave portion 231 of the power transmission shaft 25 and the convex portion 233 formed on the cylindrical member 27 when cast. Positioning in the axial direction is achieved by abutment between the abutting portions 213 and 215 of the flange portion 39 formed before and after the flange portion 207 and the flange portion 207.

As shown in FIGS. 3 and 4, the shapes of the concave portions and the convex portions, the height and the number in the radial direction (the arrangement intervals), and the like are as follows.
It may be arbitrarily selected.

In the example of FIG. 5, the outer periphery of the flange portion 207 is machined into a regular pentagon, and concave portions 251 are formed at five locations.

The power transmission shaft 25 and the cylindrical member 27 are prevented from rotating relative to each other by abutment between the concave portion 251 of the power transmission shaft 25 and the convex portion 253 formed on the cylindrical member 27 when cast. The flange 207 is positioned in the axial direction by the abutment between the abutting portions 213 and 215 of the flange 39 formed before and after the flange 207 and the flange 207.

In the example as shown in FIG.
07 may be processed into a polygon other than a regular pentagon.

In the example of FIG. 6, the outer circumferences of the flange portion 207 and the cover portion 203 are chamfered in parallel, and two concave portions 271 are formed.

The power transmission shaft 25 and the cylindrical member 27 are prevented from rotating relative to each other by abutment between the concave portion 271 of the power transmission shaft 25 and the convex portion 273 formed on the cylindrical member 27 when cast. The flange 207 is positioned in the axial direction by the abutment between the abutting portions 213 and 215 of the flange 39 formed before and after the flange 207 and the flange 207.

Further, in the example shown in FIG.
The chamfer of the outer periphery of 07 may be a multi-faced shape having two or more faces.

In each of the examples shown in FIGS. 4, 5 and 6, the same effects as those of the electromagnetic coupling 201 of the second embodiment can be obtained.

Further, the concave and convex portions constituting the invention of claim 5 may have any shape as long as the concave and convex portions engage, mesh, or abut against each other so that they cannot rotate relative to each other.

Further, contrary to the electromagnetic coupling 201 and the examples of FIGS. 4, 5 and 6, the convex portion may be formed on the shaft member and the concave portion may be formed on the cylindrical member.

[Third Embodiment] Next, an electromagnetic coupling 301 (third embodiment of the present invention) will be described with reference to FIG.

This electromagnetic coupling 301 has the features of claims 1, 2 and 3. Hereinafter, differences will be described while giving the same reference numerals to members having the same functions as those of the electromagnetic coupling 1. Note that the right side of FIG. 7 corresponds to the front (engine side) of the vehicle, and members without reference numerals and the like are not shown.

The electromagnetic coupling 301 includes a rotating case 3, a stepped portion 303 (locking means), and a snap ring 305.
(Locking means), disc spring 307, inner shaft 9, main clutch 11, ball cam 13, pressure plate 15, cam ring 17, pilot clutch 19,
It comprises an armature 21, an electromagnet 23, a controller and the like.

The rear end of the inner shaft 9 is supported by the rotor 29 via a ball bearing 309.

The power transmission shaft 25 has a front end supported by a support 311 formed on the inner periphery of the inner shaft 9.

A flange portion 313 is formed on the power transmission shaft 25, and a spline portion 315 (engaging portion) is formed on the outer periphery thereof. A flange 317 is formed at the front of the cylindrical member 27 toward the inside in the radial direction.

The step 303 is formed between the flange 313 (the power transmission shaft 25) and the flange 317 (the cylindrical member 27).

The power transmission shaft 25 is engaged with the spline portion 315 from the rear side opening of the cylindrical member 27 while engaging the spline portion 41 of the cylindrical member 27 with the flange portion 313.
Is moved until it comes into contact with the flange portion 317 (the step portion 303 comes into contact), the snap ring 305 is attached to the inner periphery of the cylindrical member 27 for positioning, and the assembling to the cylindrical member 27 is completed.

At this time, the disc spring 307 is disposed between the snap ring 305 and the flange 313 (power transmission shaft 25).

The power transmission shaft 25 and the cylindrical member 27 are prevented from rotating relative to each other by the engagement of the spline portions 315 and 41, and are positioned in the axial direction by the step portion 303 and the snap ring 305.

The disc spring 307 absorbs the backlash between the power transmission shaft 25 and the cylindrical member 27 in the axial direction.

An O-ring 319 for preventing oil leakage is arranged between the power transmission shaft 25 and the flange 317 of the cylindrical member 27.

The O-ring 319 has a smaller diameter than the O-ring 43 used in the first embodiment and has a lower sliding speed, so that it has less wear and a longer life.

The flange portion 313 of the power transmission shaft 25
Are formed with a capacity increasing space 320 and capacity increasing spaces 321 and 323 which are through holes.
The flange portions 317 have capacity increasing spaces 320 and 32.
A capacity increasing space portion 325 communicating with the first and third components 323 is formed.

These capacity increasing spaces 320, 321,
Like the other parts, the 323 and 325 contain the injected oil and air, and increase the oil capacity of the rotating case 3.

Further, the power transmission shaft 25 has a capacity increasing space 32 for increasing the oil capacity of the capacity increasing space 67.
7 are formed.

These capacity increasing spaces 320, 321,
By providing the oils 323, 325, and 327 to increase the amount of oil enclosed, the lubrication and cooling effects inside the rotating case 3 are increased, and the durability is further improved.

Thus, the electromagnetic coupling 301 is configured.

As described above, the electromagnetic coupling 301
Then, the power transmission shaft 25 and the cylindrical member 27 constituting the rotary case 3 are engaged with each other by the spline portions 315 and 41 so that they cannot rotate relative to each other, and are positioned in the axial direction by the step portion 303 and the snap ring 305. As a result, an effect equivalent to that of the electromagnetic coupling 1 of the first embodiment can be obtained.

[Fourth Embodiment] Next, an electromagnetic coupling 401 (a fourth embodiment of the present invention) will be described with reference to FIG.

This electromagnetic coupling 401 has the features of claims 1, 2 and 3. Hereinafter, differences will be described while giving the same reference numerals to members having the same functions as those of the electromagnetic coupling 1. Note that the right side of FIG. 8 corresponds to the front of the vehicle (engine side), and members without reference numerals and the like are not shown.

The electromagnetic coupling 401 includes the rotating case 3, the step 403 (locking means), and the snap ring 405.
(Locking means), inner shaft 9, main clutch 1
1, ball cam 13, pressure plate 15, cam ring 17, pilot clutch 19, armature 2
1, an electromagnet 23, a controller and the like.

The rotary case 3 includes a hollow power transmission shaft 407 (shaft member), a cylindrical member 27, a rotor 29, and the like made of a shaft steel material.

The power transmission shaft 407 is a ball bearing 5
5 supports the outer periphery of the inner shaft 9. A flange portion 409 is formed on the power transmission shaft 407, and a spline portion 411 (engaging portion) is formed on the outer periphery thereof. The axial length of the spline portion 411 is the same as the electromagnetic coupling 1,301 of the first and third embodiments.
Are longer than the spline portions 37 and 315, and the torque transmission capacity is correspondingly larger.

A flange 413 is formed at the front of the cylindrical member 27 toward the inside in the radial direction.

The step portion 403 includes a flange portion 409 (the power transmission shaft 407) and a flange portion 413 (the cylindrical member 27).
Is formed between.

The power transmission shaft 407 connects the spline section 411 to the spline section 41 from the rear side opening of the cylindrical member 27.
While engaging with the flange portion 409, the flange portion 4
13 (the step portion 403 abuts), and then the snap ring 4 outside the cylindrical member 27 is moved.
05 is attached and positioned, and the assembly to the cylindrical member 27 is completed.

The power transmission shaft 407 and the cylindrical member 27 are prevented from rotating relative to each other by the engagement of the spline portions 411 and 41, and the step portion 403 and the snap ring 405 are prevented from rotating.
And are positioned in the axial direction.

An O-ring 415 is disposed between the power transmission shaft 407 and the flange portion 413 of the cylindrical member 27, and an X-ring 417 is disposed between the inner shaft 9 and the power transmission shaft 407. Each prevents oil leakage. These O-ring 415 and X-ring 4
17 are axially wrapped with each other. Note that the back X
The ring 59 is disposed behind (outside) the needle bearing 57.

Further, the spline portion 4 of the power transmission shaft 407
19 is connected to a shaft. The shaft protrudes forward from the differential carrier, and is connected to the transfer side via a companion flange, a joint, a propeller shaft, and the like connected to the spline portion. The driving force of the engine is transmitted to the rotating case 3 via these power transmission systems.

Also, the flange portion 40 of the power transmission shaft 407
9, a capacity increasing space 420 and a capacity increasing space 421 which is a through hole are formed, and a flange 413 of the cylindrical member 27 has a capacity increasing space 423 communicating with the capacity increasing spaces 420 and 421. Are formed.

As in the other portions, the volume increasing spaces 420, 421, and 423 for increasing the oil capacity of the rotating case 3 contain the injected oil and air, and the inside of the rotating case 3 Lubrication / cooling effect and durability are further improved.

A ring 425 is welded to the pressure plate 15, and its inner periphery is connected to the spline portion 75 of the inner shaft 9. The core 89 of the electromagnet 23 is connected to the differential carrier via a support member 427 and is prevented from rotating.

Thus, the electromagnetic coupling 401 is configured.

As described above, the electromagnetic coupling 401
Then, the power transmission shaft 407 and the cylindrical member 27 constituting the rotating case 3 are engaged with each other by the spline portions 411 and 41 so that they cannot rotate relative to each other, and are positioned in the axial direction by the step portion 403 and the snap ring 405. As a result, an effect equivalent to that of the electromagnetic coupling 1 of the first embodiment can be obtained.

Also, by extending the spline portion 411 in the axial direction, the electromagnetic coupling 401 can transmit a large driving force.

The snap ring 405 can be attached and detached by an external operation. Therefore, the electromagnetic coupling 401 can be easily assembled and disassembled.

[Fifth Embodiment] Next, an electromagnetic coupling 501 (a fifth embodiment of the present invention) will be described with reference to FIG.

This electromagnetic coupling 501 has the features of claims 1, 2 and 3. Hereinafter, differences will be described while giving the same reference numerals to members having the same functions as those of the electromagnetic couplings 1,401. Note that the right side of FIG. 9 corresponds to the front (engine side) of the vehicle, and members without reference numerals and the like are not shown.

The electromagnetic coupling 501 includes a rotating case 3, a step 503 (locking means), and a snap ring 505.
(Locking means), disc spring 507, inner shaft 9, main clutch 11, ball cam 13, pressure plate 15, cam ring 17, pilot clutch 19,
It comprises an armature 21, an electromagnet 23, a controller and the like.

The rotary case 3 is composed of a hollow power transmission shaft 509 (shaft member), a cylindrical member 27, a rotor 29 and the like made of a shaft steel material.

The power transmission shaft 509 is connected to the inner shaft 9.
Is supported by a support portion 511 provided on the outer periphery of the support. The disc spring 507 is disposed between the power transmission shaft 509 and a snap ring 513 attached to the inner shaft 9, and presses the power transmission shaft 509 against a step 517 of the inner shaft 9 via a washer 515, The axial play between the power transmission shaft 509 and the inner shaft 9 is prevented.

A flange portion 519 is formed on the power transmission shaft 509, and a spline portion 521 (engaging portion) is formed on the outer periphery thereof. The spline portion 521 is provided with an axial length so as to obtain a sufficient torque transmission capacity.

In the case of the electromagnetic coupling 501,
The cylindrical member 27 has no flange portion at the front part and is open in both the front and rear directions.

The step 503 is formed between the outer plate 71 (the cylindrical member 27) on the main clutch 11 and the flange 519 (the power transmission shaft 509).

The power transmission shaft 509 connects the spline section 521 to the spline section 41 from the front opening of the cylindrical member 27.
After being moved until the flange portion 519 abuts on the outer plate 71 (the step portion 503 abuts), the snap ring 505 is attached to the inner periphery of the cylindrical member 27 to determine the position. Finish the assembly.

The power transmission shaft 509 and the cylindrical member 27 are prevented from rotating relative to each other by the engagement of the splines 521 and 41, and the step 503 and the snap ring 505 are prevented from rotating.
And are positioned in the axial direction.

An O-ring 523 is disposed between the outer periphery of the flange portion 519 of the power transmission shaft 509 and the inner periphery of the cylindrical member 27, and the inner shaft 9 and the power transmission shaft 509
An X-ring 525 is arranged between them to prevent oil leakage.

Also, the spline portion 5 of the power transmission shaft 509
27 is connected to a shaft. The shaft protrudes forward from the differential carrier, and is connected to the transfer side via a companion flange, a joint, a propeller shaft, and the like connected to the spline portion. The driving force of the engine is transmitted to the rotating case 3 via these power transmission systems.

The flange 51 of the power transmission shaft 509
9 is formed with a capacity increasing space portion 529, which increases the oil capacity of the rotating case 3.
As in the other parts, the injected oil and air are accommodated in 29, and the lubrication and cooling effects inside the rotating case 3 are improved.

Thus, the electromagnetic coupling 501 is configured.

As described above, the electromagnetic coupling 501
Then, the power transmission shaft 509 and the cylindrical member 27 constituting the rotating case 3 are engaged with each other by the spline portions 521 and 41 so that they cannot rotate relative to each other, and are positioned in the axial direction by the step portion 503 and the snap ring 505. As a result, the electromagnetic couplings 1, 4 of the first and fourth embodiments are
An effect equivalent to 01 is obtained.

Further, since the cylindrical member 27 is opened in the front-rear direction to form a cylindrical shape, each member can be assembled from either the front or the rear of the cylindrical member 27, and the assembling property is greatly improved.

The snap ring 505 can be attached and detached by an external operation. Therefore, the electromagnetic coupling 501 can be easily assembled and disassembled.

[Sixth Embodiment] Next, an electromagnetic coupling 601 (sixth embodiment of the present invention) will be described with reference to FIG.

This electromagnetic coupling 601 has the features of claims 1, 2, 3, and 4. Hereinafter, differences will be described while giving the same reference numerals to members having the same functions as those of the electromagnetic couplings 1,401. Note that the right side of FIG. 10 corresponds to the front of the vehicle (engine side), and members without reference numerals and the like are not shown.

The electromagnetic coupling 601 comprises a rotating case 3, a step 603 (locking means), and a snap ring 605.
(Locking means), an X ring 607 (seal part), an inner shaft 9, a main clutch 11, a ball cam 13, a pressure plate 15, a cam ring 17, a pilot clutch 19, an armature 21, an electromagnet 23, a controller, and the like.

The rotating case 3 is composed of a hollow power transmission shaft 609 (shaft member), a cylindrical member 27, a rotor 29 and the like made of a shaft steel material.

At the front of the cylindrical member 27, a flange portion 611 is formed radially inward, and further in front of the flange portion 611, a cylindrical portion 615 having a spline portion 613 (engaging portion) on its inner periphery is formed. ing.

The front end of the inner shaft 9 is supported by the flange 611 via a ball bearing 617. The X ring 607 is disposed between the flange portion 611 and the inner shaft 9 to prevent oil leakage from between them.

The power transmission shaft 609 is supported by a support portion 619 provided on the flange portion 611 (the cylindrical member 27). A spline portion 621 (engaging portion) that engages with the spline portion 613 of the cylindrical member 27 is formed on the outer periphery of the power transmission shaft 609.

The step 603 is formed between the power transmission shaft 609 and the flange 611 (the cylindrical member 27).

[0211] The power transmission shaft 609 has a front cylindrical portion 615.
While engaging the spline portion 621 with the spline portion 613 of the (cylindrical member 27), the spline portion 621 is moved until it hits the flange portion 611 (the step portion 603 hits), and then a snap ring 605 is attached to the inner periphery of the cylindrical portion 615. It is positioned and assembled to the cylindrical member 27.

The power transmission shaft 609 and the cylindrical member 27 are prevented from rotating relative to each other by the engagement of the spline portions 621 and 613, and the step portion 603 and the snap ring 60 are prevented from rotating.
5 in the axial direction.

Further, the spline portion 6 of the power transmission shaft 609
The shaft 23 is connected to 23. The shaft protrudes forward from the differential carrier, and is connected to the transfer side via a companion flange, a joint, a propeller shaft, and the like connected to the spline portion. The driving force of the engine is transmitted to the rotating case 3 via these power transmission systems.

[0214] Thus, the electromagnetic coupling 601 is configured.

As described above, the electromagnetic coupling 601
Then, the power transmission shaft 609 and the cylindrical member 27 constituting the rotating case 3 are engaged with each other by the spline portions 621 and 613 so that they cannot rotate relative to each other, and are positioned in the axial direction by the step portion 603 and the snap ring 605. As a result, the electromagnetic couplings 1 and 1 of the first and fourth embodiments are
The same effect as 401 can be obtained.

Although the above-described features of the present invention minimize the axial play between the cylindrical member 27 constituting the rotating case 3 and the power transmission shaft 609, the electromagnetic coupling 601 does not. , X ring 607 is arranged not between power transmission shaft 609 and inner shaft 9, but between cylindrical member 27 and inner shaft 9, so that X ring 607 becomes cylindrical member 27 and power transmission shaft 609. While being completely released from the axial play with
Since the axial play between the power transmission shaft 609 and the inner shaft 9 is prevented from being input to the X ring 607, X
The durability of the ring 607 is greatly improved.

The power transmission shaft 609 and the cylindrical member 27
By disposing the engaging portions (spline portions 621 and 613) with the outside of the X ring 607, the power transmission shaft 609 can be attached and detached without affecting the X ring 607,
As a result, assemblability and maintainability are improved.

The snap ring 605 can be attached and detached by an external operation. Therefore, the electromagnetic coupling 601 has good workability in assembling and disassembling.

[Seventh Embodiment] Next, an electromagnetic coupling 701 (seventh embodiment of the present invention) will be described with reference to FIG.

The electromagnetic coupling 701 has the features of claims 1, 2, 3, and 4. 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 601. Note that the right side of FIG. 11 corresponds to the front of the vehicle (engine side), and members without reference numerals and the like are not shown.

The electromagnetic coupling 701 includes a rotating case 3, a step 703 (locking means), and a snap ring 605.
(Locking means), an X ring 607 (seal part), an inner shaft 9, a main clutch 11, a ball cam 13, a pressure plate 15, a cam ring 17, a pilot clutch 19, an armature 21, an electromagnet 23, a controller, and the like.

The rotating case 3 is composed of a hollow power transmission shaft 705 (shaft member), a cylindrical member 27, a rotor 29 and the like made of a shaft steel material.

At the front of the cylindrical member 27, a flange portion 707 is formed radially inward, and further in front of the flange portion 707, a cylindrical portion 615 having a spline portion 613 on the inner periphery is formed.

[0224] The inner shaft 9 is a ball bearing 6
17 is supported by the flange portion 707.
The X ring 607 is disposed between the flange portion 707 and the inner shaft 9 to prevent oil leakage from between them.

A spline portion 70 engaging with a spline portion 613 of the cylindrical member 27 is provided on the outer periphery of the power transmission shaft 705.
9 (engaging portion) is formed.

The step 703 is formed between the power transmission shaft 705 and the flange 707 (the cylindrical member 27).

The power transmission shaft 705 is attached to the spline portion 613 of the cylindrical portion 615 (cylindrical member 27).
9 is engaged with the flange 707 (the step 703 abuts), and the snap ring 605 is attached to the inner periphery of the cylindrical portion 615 to be positioned and assembled to the cylindrical member 27.

The power transmission shaft 705 and the cylindrical member 27 are prevented from rotating relative to each other by the engagement of the spline portions 709 and 613, and the step portion 703 and the snap ring 60 are prevented from rotating.
5 position in the axial direction.

The spline portion 7 of the power transmission shaft 705
11 is connected to a shaft. The shaft protrudes forward from the differential carrier, and is connected to the transfer side via a companion flange, a joint, a propeller shaft, and the like connected to the spline portion. The driving force of the engine is transmitted to the rotating case 3 via these power transmission systems.

The flange portion 707 of the cylindrical member 27
Is formed with a capacity increasing space portion 713 which increases the oil capacity of the rotating case 3.
Like the other parts, the injected oil and air are contained in the rotary case 3 to improve the lubrication and cooling effects inside the rotating case 3.

Thus, the electromagnetic coupling 701 is constituted.

As described above, the electromagnetic coupling 701
Then, the power transmission shaft 705 and the cylindrical member 27 constituting the rotating case 3 are engaged with each other by the spline portions 709 and 613 so that they cannot rotate relative to each other, and they are positioned in the axial direction by the step portion 703 and the snap ring 605. Thus, the electromagnetic couplings 1, 6 of the first and sixth embodiments
An effect equivalent to 01 is obtained.

The X-ring 607 is connected to the cylindrical member 27.
And between the inner shaft 9 and
The axial play between the power transmission shaft 705 and the inner shaft 9 and the axial play between the cylindrical member 27 and the power transmission shaft 609 are released, and the durability is greatly improved.

Further, the power transmission shaft 705 can be attached and detached without affecting the X-ring 607, so that the assembling and maintenance are improved accordingly.

The electromagnetic coupling of the present invention can be used for a differential limiting mechanism by disposing it between differential rotating members of a differential device.

As described above, the conventional example in which the components of the case-shaped torque transmitting member are connected by the screw thrust force has a problem of loosening of the screw. It discloses a connecting form of the components of the case-shaped torque transmitting member by means of a portion and a locking means (claims 1 to 4) or casting (claim 5). The connecting portion does not loosen even when subjected to vibration or the like.

Therefore, all of the elements other than the engaging portions and the locking means shown in each embodiment, which have the property of not being loosened by torque or vibration, are included in the scope of the present invention.

[0238]

According to the electromagnetic coupling described in the first aspect, the shaft member and the cylindrical member are prevented from rotating relative to each other by the engaging portion, and are positioned in the axial direction by a locking means such as a snap ring. Therefore, these connecting parts are released from the influence of the temperature change, and the deterioration of the connecting function is prevented, so that the normal function is maintained for a long time.

In addition, by obtaining the cylindrical member from a light alloy while obtaining such effects, it is possible to prevent leakage of the magnetic force of the electromagnet and to reduce the weight of the electromagnetic coupling.

Further, a large driving force can be transmitted by forming the shaft member from a shaft steel material.

Further, an axially long bolt receiving portion 727 is not required, and the electromagnetic coupling 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 case-shaped torque transmitting member increases, and the lubrication and The cooling effect and durability are improved.

Further, the processing of the screw portion 729 and the stud bolt 731 are required, and the number of processing steps, the number of parts, and the number of assembling steps are reduced accordingly, and the cost is reduced.

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

Further, in this configuration in which the shaft member and the cylindrical member are engaged with each other by the spline portion, the assembling work and the disassembling work are easy, and the working cost is reduced.

The engaging portion formed by the spline portion formed on the inner periphery of the cylindrical member has a large diameter and can transmit a large driving force.

Further, a spline portion for engaging the plate of the clutch device and a spline portion for engaging the shaft member can be shared. In this case, assembling the shaft member to the cylindrical member and assembling other members are possible. And can be done by a series of work, making assembly easier,
Assembly costs are further reduced.

Further, it is not necessary to machine another spline portion for engaging the shaft member and the cylindrical member, and the machining cost is further reduced.

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

Further, in this configuration in which the shaft member and the cylindrical member are abutted at the step, the operation of attaching the snap ring to the inside of the member is not involved, so that the assembling operation of the shaft member and the cylindrical member is extremely difficult. Easy.

Also, only one snap ring is required, and the number of parts is reduced.

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

Further, the seal portion is released from the axial play between the shaft member and the axial torque transmitting member and from the axial play between the cylindrical member and the shaft member, and the durability is greatly improved.

Further, the shaft member can be attached and detached without affecting the seal portion, and the assembling and maintenance are improved accordingly.

In the electromagnetic coupling according to the fifth aspect, the cylindrical member is cast into the shaft member, and the cast portion is provided with an uneven portion for preventing relative rotation with each other. The cast part is released from the influence of the temperature change, and the deterioration of the connection function is prevented, and the normal function is maintained for a long time.

Further, by obtaining the cylindrical member from a non-magnetic light alloy while obtaining such effects, leakage of the magnetic force of the electromagnet can be prevented and the weight of the electromagnetic coupling can be reduced.

Further, a large driving force can be transmitted by forming the shaft member from a shaft steel material.

Also, the bolt receiving portion 1027 which is long in the axial direction
Is unnecessary, and the electromagnetic coupling is accordingly made more compact 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 case-shaped torque transmitting member increases, and the lubrication and The cooling effect and durability are improved.

Further, the processing of the screw portion 1029 and the stud bolt 1031 become unnecessary, and the number of processing steps, the number of parts, and the number of assembling steps are reduced accordingly, and the cost is reduced.

Also, by casting the cylindrical member into the shaft member, countermeasures against the relative rotation of the shaft member and the cylindrical member are simultaneously performed. Therefore, the assembling work of the shaft member and the cylindrical member and the relative rotation of these members are reduced. This eliminates the need for an engaging operation or a locking operation for prevention, thereby greatly reducing the implementation cost.

[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 cross-sectional view taken along the line AA of FIG. 2 and shows a shape of an uneven portion between a shaft member and a cylindrical member.

FIG. 4 is a view corresponding to a cross-sectional view taken along line AA of FIG. 2, and is another example showing a shape of a concave-convex portion between a shaft member and a cylindrical member.

FIG. 5 is a view corresponding to a cross-sectional view taken along the line AA of FIG. 2, showing another example of the shape of the uneven portion between the shaft member and the cylindrical member.

FIG. 6 is a view corresponding to a cross-sectional view taken along the line AA of FIG. 2, showing another example of the shape of the uneven portion between the shaft member and the cylindrical member.

FIG. 7 is a sectional view showing a third embodiment.

FIG. 8 is a sectional view showing a fourth embodiment.

FIG. 9 is a sectional view showing a fifth embodiment.

FIG. 10 is a sectional view showing a sixth embodiment.

FIG. 11 is a sectional view showing a seventh embodiment.

FIG. 12 is a sectional view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electromagnetic coupling 3 Rotating case (case-like torque transmission member) 5 Step part (locking means) 7 Snap ring (locking means) 9 Inner shaft (axial torque transmission member) 11 Main clutch (clutch device) 13 Ball cam (Clutch device) 15 Pressure plate (clutch device) 17 Cam ring (clutch device) 19 Pilot clutch (clutch device) 23 Electromagnet 25 Power transmission shaft (shaft member) 27 Cylindrical member 37 Spline portion on power transmission shaft 25 side (engagement) 41) Spline portions (engaging portions) on the cylindrical member 27 side 201 Electromagnetic couplings 209, 231, 251, 271 Concave portions 211, 233, 253, 273 on the power transmission shaft 25 side Projections on the cylindrical member 27 side 301 Electromagnetic coupling 303 Step (locking means) 30 5 Snap ring (locking means) 315 Spline part (engaging part) 401 Electromagnetic coupling 403 Step part (locking means) 405 Snap ring (locking means) 407 Power transmission shaft (shaft member) 411 Spline part (engagement) Joint part) 501 Electromagnetic coupling 503 Step part (locking means) 505 Snap ring (locking means) 509 Power transmission shaft (shaft member) 521 Spline part (engaging part) 601 Electromagnetic coupling 603 Step part (engagement part) 605 Snap ring (locking means) 607 X ring (seal part) 609 Power transmission shaft (shaft member) 613 Spline part (engagement part) on cylindrical member 27 side 621 Spline part on power transmission shaft 609 side ( Engaging part) 701 Electromagnetic coupling 703 Step part (locking means) 705 Power transmission shaft (shaft) 709) Spline portion (engaging portion) on the power transmission shaft 705 side

Claims (5)

[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 shaft member for torque transmission, and a cylindrical member of a non-magnetic material which is arranged by dividing the magnetic path of the electromagnet and the shaft member while enclosing the clutch device, and the shaft member and the cylindrical member. The electromagnetic coupling is engaged by the engaging portion so as to be relatively non-rotatable, and is axially locked by locking means including a snap ring. 2. The invention according to claim 1, wherein the engagement portion between the shaft member and the cylindrical member is a spline portion provided between the inner periphery of the cylindrical member and the shaft member. Electromagnetic coupling characterized by the following. 3. The step according to claim 1, wherein the locking means for fixing the shaft member and the cylindrical member abuts the shaft member and the cylindrical member in the direction in which they are assembled to each other. And a snap ring for preventing detachment in a direction opposite to the assembly. 4. The invention according to claim 1, wherein a seal is provided between the cylindrical member and the shaft-shaped torque transmitting member, and the shaft member is engaged with the cylindrical member. An electromagnetic coupling, wherein the portion is disposed outside the case-shaped torque transmitting member from the seal portion. 5. 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 shaft member for torque transmission, a non-magnetic cylindrical member that includes a clutch device and is arranged by dividing the magnetic path of the electromagnet and the shaft member, and includes a cylindrical member as the shaft member. The electromagnetic coupling is characterized in that it is cast and integrated, and that the cast portion is provided with a concave / convex portion between the shaft member and the cylindrical member that makes relative rotation impossible.