JP2007315610A - Coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling capable of providing sufficient torque capacity without using a large electromagnet by reducing magnetic resistance of a magnetic circuit. <P>SOLUTION: In the coupling 1 of this invention, a yoke 31 of the electromagnet 13 is inserted in a recessed part 39 provided for an axial direction side wall member, forming an air gap between the axial direction side wall member and itself. A magnet flux of a magnet flux loop generated by excitation of the electromagnet 13 permeates between an outer circumference face of the yoke 31 of the electromagnet 13 at which the air gap is formed and an inner circumference face of the axial direction side wall member and between the inner circumference face of the yoke 31 of the electromagnet 13 and the axial direction side wall member and width of the inner circumference face and the outer circumference face of the axial direction side wall member facing against the yoke 31 of the electromagnet 13 is wider than the width of the outer circumference face and the inner circumference face in the yoke 31 of the electromagnet 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a coupling operated by an electromagnet.

  Japanese Patent Laid-Open No. 5-310226 discloses a coupling 201 (hydraulic power transmission joint) as shown in FIG.

  The coupling 201 is driven by the input shaft 203, the output-side housing 205, and the relative rotation of the input shaft 203, the plunger pump 207 that couples them by the driving resistance (pump work), the orifice and the opening hole, the orifice and the opening. An armature 209 (actuator) that makes the hole communicate with or closes the discharge path of the plunger pump 207, a return spring 211 that biases the armature 209 to one side in the rotational direction, and an input shaft 203 A friction member 213 that generates frictional resistance with the armature 209 and an electromagnet 215 that rotates the armature 209 against the return spring 211 are connected.

  The electromagnet 215 includes a coil 217 and a yoke 219. The yoke 219 is connected to the stationary casing outside the housing 205 and penetrates into a recess 223 provided in the magnetic frame 221 connected to the housing 205 side.

  The housing 205 is made of a nonmagnetic material such as aluminum or stainless steel, and the magnetic frame 221 is made of an iron-based magnetic material.

  As depicted by the broken line, the coil 217, the yoke 219, the magnetic frame 221, the friction member 213, and the armature 209 constitute the magnetic circuit of the electromagnet 215. -225 occurs.

  In a state where excitation of the electromagnet 215 is stopped, the armature 209 is rotated to one side by the return spring 211. At this rotation angle, the opening hole is closed, the orifice communicates with the discharge path of the plunger pump 207, and the coupling 201 is connected by the driving resistance of the plunger pump 207 generated by the flow path resistance of the orifice.

  In this state, power is transmitted while allowing differential rotation by an appropriate flow path resistance of the oil flowing through the orifice.

  Further, when the electromagnet 215 is lightly excited with an appropriate current, the armature 209 is pressed against the friction member 213 and receives the torque of the input shaft 203 and rotates against the return spring 211 to open the opening hole and the orifice. Both are closed.

  In this state, the coupling 201 is firmly connected by the large flow path resistance generated in the discharge path of the plunger pump 207 by closing both the opening hole and the orifice, and the input shaft 203 and the housing 205 are locked. Rotation is not allowed.

  When the electromagnet 215 is strongly excited with a large current, the armature 209 is further rotated by the torque of the input shaft 203, and the open hole communicates with the discharge path of the plunger pump 207.

  In this state, the driving resistance of the plunger pump 207 is reduced, and the coupling 201 is released.

  FIG. 3 shows a coupling 227 having a configuration different from that of the coupling 201.

  The coupling 227 is disposed inside the rotary case 229, the shaft-shaped torque transmission member penetrating the rotary case 229, the main clutch and the control clutch arranged therebetween, and the rotary case 229. The armature is composed of an electromagnet 231 that moves the armature from the outside of the rotary case 229, a cam, and the like.

  The rotating case 229 is formed by screwing a cylindrical member 233 made of a non-magnetic material and a rotor member 235 made of a magnetic material into a seal groove 237 provided in the rotor member 235. An O-ring 239 is disposed to prevent oil leakage.

  The electromagnet 231 penetrates into a recess 241 provided in the rotor member 235. When the electromagnet 231 is excited, a magnetic loop 243 passing through the rotor member 235, the control clutch, and the armature is formed. Suction the armature and press the control clutch.

  When the control clutch is connected, the cam is actuated by receiving transmission torque between the rotary case 229 and the shaft-shaped torque transmission member, the main clutch is connected, and the coupling 227 is connected.

  However, in the coupling 201 of FIG. 2, the width of the magnetic frame 221 is narrower than that of the yoke 219 at the portion where the yoke 219 of the electromagnet 215 forming the magnetic circuit is opposed to the magnetic frame 221.

  When a portion where the cross-sectional area of the magnetic circuit suddenly narrows occurs between the magnetic frame 221 and the yoke 219, the magnetic flux density per unit area increases in the narrow magnetic circuit portion (magnetic frame 221). , Magnetic flux leakage is likely to increase accordingly.

  When the leakage magnetic flux increases, the attractive force of the armature 209 decreases accordingly, and the control function of the coupling 201 decreases. In order to compensate for this, it is necessary to enlarge the cross-sectional area of the magnetic circuit, and as a result, the coupling 201 becomes larger and the in-vehicle performance is reduced.

  In addition, in the coupling 227 of FIG. 3, the cross-sectional area of the magnetic circuit is narrowed by the seal groove 237 for the O-ring 239 provided in the rotor member 235 as indicated by an arrow 245. -The suction force of Macha decreases and the torque capacity of the coupling 227 decreases.

  In order to compensate for this, it is necessary to increase the diameter of the rotor member 235 or to increase the size in the axial direction so that the seal groove 237 is sufficiently separated from the magnetic circuit. The size of 227 increases, the weight increases, and the in-vehicle performance decreases.

  Further, when the cylindrical member 233 and the rotor member 235 are screwed together, there is a possibility that an excessive force is applied to the O-ring 239 and the O-ring 239 is damaged.

  Therefore, an object of the present invention is to provide a coupling that can obtain a sufficient torque capacity without using a large electromagnet by reducing the magnetic resistance of a magnetic circuit.

  The coupling according to claim 1 is a case-like torque transmission member on one side formed by fixing a cylindrical member and an axial side wall member of a magnetic material to each other, and an axial torque transmission member on the other side penetrating into the case-like torque transmission member. A multi-plate clutch disposed between the cylindrical member and the shaft-shaped torque transmission member; an armature disposed adjacent to the clutch inside the case-shaped torque transmission member; the axial side wall member, the clutch, and the armature; An electromagnet that moves and controls the armature through a magnetic circuit formed by the electromagnetic circuit, and the yoke of the electromagnet is disposed so as to penetrate into a recess provided in the axial side wall member. An air gap is formed between the outer peripheral surface of the electromagnet yoke and the inner peripheral surface of the axial side wall member, and the yaw of the electromagnet. The magnetic flux of a magnetic flux loop generated by the excitation of the electromagnet is transmitted between the inner peripheral surface of the axial direction side wall member and the end surface on the outer peripheral side of the axial side wall member is the end surface of the cylindrical portion of the case-shaped torque transmission member It is provided so as to protrude more in the axial direction, and the width of the inner peripheral surface of the axial side wall member is set wider than the width of the outer peripheral surface of the yoke of the electromagnet.

  The coupling according to claim 1, wherein an outer peripheral end surface of the axial side wall member is provided so as to protrude in an axial direction from an end surface of the cylindrical portion of the case-shaped torque transmission member, and a width of an inner peripheral surface of the axial side wall member Is set wider than the width of the outer peripheral surface of the yoke of the electromagnet, the magnetic circuit section of the axial side wall member facing the electromagnet becomes narrower and the magnetic flux density suddenly increases. This prevents magnetic flux leakage.

  Thus, since the magnetic force of the electromagnet is effectively concentrated on the armature, the coupling can obtain a sufficient torque capacity.

  Therefore, an increase in size and weight of the coupling can be prevented, and power saving can be achieved.

  The coupling according to claim 2 is the coupling according to claim 1, wherein the yoke of the electromagnet is supported by bearings on the axial side wall member, and the outer peripheral surface of the axial side wall member in which the air gap is formed is The electromagnet yoke protrudes in an axial direction from an end portion of the inner peripheral surface of the yoke and is in contact with the bearing.

  In the coupling according to the second aspect, since the yoke is supported by the axial side wall member and the outer peripheral surface of the axial side wall member is in contact with the bearing, the yoke is stably supported by the axial side wall member.

  The coupling according to claim 3 is the coupling according to claim 1 or claim 2, wherein the outer peripheral surface and the inner peripheral surface of the yoke of the electromagnet through which the magnetic flux of the magnetic flux loop passes are the coils of the electromagnet. It is located in the radially outer side and the inner side, and is opposed to the inner peripheral surface and the outer peripheral surface of the axial side wall member.

  Since the coupling according to claim 3 is similar to the coupling according to claim 1 or 2, leakage of magnetic flux is reduced, so that a sufficient torque transmission capacity can be obtained and the increase in size and weight can be prevented. And power saving.

  A coupling according to a fourth aspect is the coupling according to any one of the first to third aspects, wherein a width of the inner peripheral surface and the outer peripheral surface of the axial side wall member is equal to that of the electromagnet. The yoke is formed to be sufficiently wider than the width of the outer peripheral surface and the inner peripheral surface.

  In addition, the coupling of claim 4 can reduce the leakage of magnetic flux by making the magnetic circuit part of the differential case facing the electromagnet sufficiently wider than the electromagnet, so that sufficient coupling force can be obtained and the size can be increased. Therefore, the weight is prevented, the in-vehicle property is improved, and the power is saved.

  A fifth aspect of the present invention is the coupling according to any one of the first to fourth aspects, wherein the cylindrical member and the axial side wall member of the case-shaped torque transmission member are screwed together. Further, the end face on the outer peripheral side of the axial side wall member protrudes in the axial direction from the screwed portion, and an effect equivalent to any one of claims 1 to 4 is obtained.

  In addition to this, in this configuration in which the cylindrical member and the axial side wall member are screwed together, it is possible to adjust the clearance between the clutch plates of the multi-plate clutch by adjusting the relative positions of these by the screw portion. Yes, such an adjustment can maximize the suction force of the armature.

  Thus, the torque capacity and the fastening function of the coupling can be adjusted to an optimum state, and the electromagnet can be further reduced in size and power can be saved.

  A sixth aspect of the present invention is the coupling according to any one of the first to third aspects, wherein the cylindrical member of the case-like torque transmitting member and the axial side wall member are formed in the groove of the cylindrical member. It is connected by the attached snap ring, The effect equivalent to any one of Claim 1 thru | or 3 is acquired.

  Further, since the mounting groove of the snap ring is provided in the cylindrical member made of nonmagnetic material, the magnetic circuit is prevented from being narrowed, so that the coupling can obtain a sufficient torque transmission capacity.

  The coupling according to claim 1, wherein an outer peripheral end surface of the axial side wall member is provided so as to protrude in an axial direction from an end surface of the cylindrical portion of the case-shaped torque transmission member, and a width of an inner peripheral surface of the axial side wall member Is set wider than the width of the outer peripheral surface of the yoke of the electromagnet, thereby preventing the magnetic circuit from becoming narrow and increasing the magnetic flux density, thereby reducing the leakage of magnetic flux and reducing the magnetic force of the electromagnet. Effectively led to.

  Accordingly, since the coupling can obtain a sufficient torque capacity, the coupling can be prevented from being enlarged and weighted, and the onboard performance can be improved and the power can be saved.

  The coupling of claim 2 achieves the same effect as that of claim 1, and the yoke is stably supported with respect to the axial side wall member.

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

  The coupling of claim 4 has the same effect as the coupling of claims 1 and 2 by making the magnetic circuit portion of the differential case sufficiently wider than the opposing surface of the electromagnet.

  The coupling according to claim 5 obtains the same effect as any one of claims 1 to 4, and the coupling between the coupling member by adjusting the clearance of the clutch plate at the threaded portion between the cylindrical member and the axial side wall member. The torque capacity and the fastening function can be adjusted to the optimum state, and the electromagnet can be further reduced in size and power can be saved.

  Further, the cylindrical member and the axial side wall member are firmly connected by screwing.

  The invention of claim 6 achieves the same effect as any of claims 1 to 3, and the cylindrical member of the case-like torque transmission member and the axial side wall member are connected by a snap ring. Unlike the conventional example, the seal is prevented from being damaged, and the normal function is maintained for a long time.

  Further, since the mounting groove for the snap ring is provided in the cylindrical member made of a non-magnetic material to prevent the magnetic circuit from becoming narrow, the coupling can obtain a sufficient torque capacity.

  An embodiment (coupling 1) of the present invention will be described with reference to FIG.

  FIG. 1 shows a coupling 1, and the right side of FIG. 1 corresponds to the front of a four-wheel drive vehicle using the coupling 1. Further, members and the like that are not given reference numerals are not shown.

  The coupling 1 is disposed in a power transmission system on the rear wheel side, and connects and disconnects the rear wheel.

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

  When the coupling 1 is connected, the vehicle is in a four-wheel drive state, and the driving force of the engine is transmitted to the rear differential (a differential device that distributes the driving force of the engine to the left and right rear wheels). Allocated to the rear wheels.

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

  The coupling 1 is disposed on the front end side of a differential carrier that houses a rear differential, and includes a rotating case 3 (a case torque transmission member on one side), an inner shaft (an axial torque transmission member on the other side). And a multi-plate main clutch, a multi-plate control clutch 5, a cam ring 7, a ball cam 9, a pressure plate, an armature 11, a ring-shaped electromagnet 13, a controller, and the like.

  The rotary case 3 includes a front rotor 15 (axial side wall member), a cylindrical member 17, and a rear rotor.

  A screw portion 19 and a stopper portion 21 are provided between the front rotor 15 and the cylindrical member 17, and the front rotor 15 and the cylindrical member 17 are screwed together by the screw portion 19 to be integrated into a stopper. The part 21 is abutted and positioned.

  The cylindrical member 17 and the rotor on the rear side are connected in the rotational direction by, for example, a connecting portion, and are positioned in the axial direction by the snap ring and the abutting portion.

  The rotor 15 is made of an iron-based magnetic material, and the cylindrical member 17 is made of a nonmagnetic material such as aluminum.

  The cylindrical member 17 is provided with a seal groove 23, and an O-ring 25 (seal) is disposed in the seal groove 23 to prevent oil leakage and entry of foreign matter.

  A connecting shaft portion 27 is formed integrally with the front rotor 15, and a companion flange is connected to the connecting shaft portion 27 by a selection. This companion flange is connected to the flange on the joint side, and further connected to the propeller shaft on the rear wheel side.

  The electromagnet 13 includes a coil 29 and a yoke 31 that accommodates the coil 29. The yoke 31 is provided with a flange portion 33, and the flange portion 33 is fixed to the opening of the differential carrier by a bolt.

  The lead wire of the coil 29 is directly drawn from the yoke 31 to the outside.

  The connecting shaft portion 27 of the rotor 15 is supported by a differential carrier via a bearing 35 and a yoke 31.

  The inner shaft penetrates into the rotary case 3 from the rear rotor, and is supported on the rotary case 3 via a bearing.

  A drive pinion shaft is splined to the inner shaft, and a drive pinion gear formed on the drive pinion shaft meshes with a ring gear on the rear differential side.

  The rotary case 3 is sealed by an O-ring 25 between the rotor 15 and the cylindrical member 17 and a seal disposed between the other members, and the main oil is sealed by oil sealed inside. The clutch, the control clutch 5, the ball cam 9, the bearing and the like are lubricated.

  The main clutch is disposed between the inner periphery of the rotary case 3 (cylindrical member 17) and the outer periphery of the inner shaft.

  The control clutch 5 is disposed between the inner periphery of the cylindrical member 17 and the outer periphery of the cam ring 7, and is pressed against the rotor 15 of the rotary case 3 by the armature 11 as described below. It is concluded.

  The ball cam 9 is disposed between the cam ring 7 and the pressure plate. A thrust bearing 37 that receives the cam reaction force of the ball cam 9 is disposed between the cam ring 7 and the rotor 15.

  The pressure plate is connected to the outer periphery of the inner shaft so as to be movable in the axial direction.

  The armature 11 is connected to the inner periphery of the cylindrical member 17 so as to be axially movable between the control clutch 5 and the pressure plate.

  The yoke 31 of the electromagnet 13 penetrates into a recess 39 provided in the rotor 15 to form an air gap 41.

  The coil 29, the yoke 31, the rotor 15, the control clutch 5, and the armature 11 constitute a magnetic circuit of the electromagnet 13, and when the electromagnet 13 is excited, a magnetic loop 43 passing therethrough is generated. .

  The rotor 15 is provided with an opening 45, and a ring 47 made of a nonmagnetic material such as stainless steel is disposed in the opening 45. Further, a notch 49 is formed in each clutch plate of the control clutch 5. The opening 45, the ring 47, and the notch 49 prevent the magnetic loop 43 from being short-circuited, and effectively guides the magnetic force of the electromagnet 13 to the armature 11.

  The controller detects turning traveling from the vehicle speed, the steering angle, the lateral G, or the like, or performs excitation of the electromagnet 13, excitation current control, excitation stop, etc. according to the road surface condition or the like.

  When the electromagnet 13 is excited, the armature 11 is attracted by the magnetic loop 43 and presses the control clutch 5 between the rotor 15 and fastens it. When the control clutch 5 is engaged, a torque is applied between the rotary case 3 and the inner shaft to actuate the ball cam 9, and the main clutch is pressed through the pressure plate by the generated cam thrust force. And concluded.

  When the coupling 1 is connected in this way, the driving force of the engine is sent to the rear wheels, the vehicle is in a four-wheel drive state, and the running performance on rough roads and the stability of the vehicle body are improved.

  When the exciting current of the electromagnet 13 is controlled, the cam thrust force of the ball cam 9 changes due to the slip of the control clutch 5, and the connecting force of the main clutch changes to adjust the driving force sent to the rear wheels.

  When the driving force distribution ratio between the front and rear wheels is controlled in this way, for example, the maneuverability and stability of the vehicle while turning is improved.

  When the excitation of the electromagnet 13 is stopped, the control clutch 5 is released and the cam thrust force of the ball cam 9 disappears, the main clutch is released and the coupling 1 is released, and the vehicle enters a two-wheel drive state.

  Further, the width 51 of the concave portion 39 of the rotor 15 constituting a part of the magnetic circuit is sufficiently wider than the width 53 of the magnetic circuit portion of the electromagnet 13 opposed thereto.

  Therefore, unlike the conventional example shown in FIG. 2, the magnetic circuit is prevented from suddenly narrowing the cross-sectional area to increase the magnetic flux density, and magnetic flux leakage is greatly reduced. 11 effectively concentrate.

  Thus, the coupling 1 is configured.

  As described above, the coupling 1 differs from the conventional example of FIG. 2 by making the width 51 of the recess 39 (magnetic circuit portion) of the rotor 15 wider than the width 53 (magnetic circuit portion) of the electromagnet 13. Thus, since the cross-sectional area of the magnetic circuit is reduced and the magnetic flux density is prevented from increasing at this point, leakage of the magnetic flux is reduced, and the magnetic force of the electromagnet 13 is effectively concentrated on the armature 11. .

  Further, by providing the seal groove 23 in the non-magnetic cylindrical member 17, unlike the conventional example of FIG. 3, the cross-sectional area of the magnetic circuit is prevented from becoming narrow.

  Therefore, the coupling 1 can obtain a sufficient torque capacity.

  Further, in order to prevent the magnetic circuit from becoming narrower, it is not necessary to separate the seal groove 23 from the magnetic circuit, and accordingly, the rotor 15 is increased in diameter or increased in the axial direction. There is no need to do.

  In this way, the coupling 1 is prevented from being increased in size and weight, the on-board performance is improved, and an increase in power consumption can be avoided.

  Further, in this configuration in which the rotor 15 and the cylindrical member 17 are screwed together, the clearance between the clutch plates of the main clutch and the control clutch 5 can be adjusted by adjusting the relative positions of the screws. Alternatively, the air gap 41 between the yoke 31 and the rotor 15 of the electromagnet 13 can be adjusted.

  With these adjustments, the torque capacity of the coupling 1 can be adjusted to an optimum state, and the electromagnet 13 can be further miniaturized to save power.

  Further, the rotor 15 and the cylindrical member 17 are firmly connected by screwing.

  The invention of claim 1 does not amplify the pressing force of the clutch by the cam, but is a coupling that interrupts the connection of the torque transmitting member by the clutch that is pressed by the armature that is moved by the electromagnet.

  Further, as described above, the coupling according to claims 1 and 2 is provided between the transfer and the rear wheel side propeller shaft of the four-wheel drive vehicle, or between the transfer and the front wheel side propeller shaft, or the front wheel. You may arrange | position between a side propeller shaft and a front differential.

  In the invention of claim 6, the cylindrical member of the case-like torque transmitting member and the axial side wall member are connected by a snap ring. Unlike the conventional example of FIG. Damage is prevented.

  Further, since the snap ring is attached to the cylindrical member made of a non-magnetic material, the magnetic circuit is prevented from being narrowed.

In the present invention, the seal is not limited to the O-ring but may be another seal.
The clutch is not limited to a multi-plate clutch, and may be a friction clutch such as a cone clutch.

It is sectional drawing which shows the coupling of one Embodiment. It is sectional drawing which shows a 1st prior art example. It is sectional drawing which shows a 2nd prior art example.

Explanation of symbols

1 Coupling 3 Rotating case (One-side case-like torque transmission member)
5 Control clutch (friction clutch)
9 Ball cam (cam)
11 Armature 13 Electromagnet 15 Rotating Case Rotor (Magnetic Material)
17 Rotating case cylindrical member (non-magnetic material)
19 Thread part 23 Seal groove 25 provided in the cylindrical member 17 O-ring (seal)
31 Yoke of electromagnet 13

Claims (6)

  A case-like torque transmission member on one side formed by fixing a cylindrical member and an axial side wall member of magnetic material to each other, an axial torque transmission member on the other side penetrating therethrough, and the cylindrical member and the axial torque transmission Through a magnetic circuit formed by a multi-plate clutch disposed between the members, an armature disposed adjacent to the clutch inside the case-shaped torque transmission member, and the axial side wall member, the clutch and the armature. And an electromagnet for moving the armature to engage and disengage the clutch, and the yoke of the electromagnet is disposed so as to penetrate into the recess provided in the axial side wall member to form an air gap with the axial side wall member And between the outer peripheral surface of the yoke of the electromagnet and the inner peripheral surface of the axial side wall member in which the air gap is formed, and between the inner peripheral surface of the yoke of the electromagnet and the axial side wall. The magnetic flux of the magnetic flux loop generated by the excitation of the electromagnet is transmitted between the material and the end surface on the outer peripheral side of the axial side wall member is provided so as to protrude in the axial direction from the end surface of the cylindrical portion of the case-like torque transmission member, The coupling characterized in that the width of the inner peripheral surface of the axial side wall member is set wider than the width of the outer peripheral surface of the yoke of the electromagnet.   2. The coupling according to claim 1, wherein the yoke of the electromagnet is supported by bearings on the axial side wall member, and an outer peripheral surface of the axial side wall member in which the air gap is formed is an inner peripheral surface of the yoke of the electromagnet. A coupling projecting in the axial direction from the end of the shaft and contacting the bearing.   3. The coupling according to claim 1, wherein the outer peripheral surface and the inner peripheral surface of the yoke of the electromagnet through which the magnetic flux of the magnetic flux loop passes are located on the radially outer side and the inner side of the coil of the electromagnet. The coupling is characterized by facing the inner peripheral surface and the outer peripheral surface of the axial side wall member.   4. The coupling according to claim 1, wherein a width of the inner peripheral surface and the outer peripheral surface of the axial side wall member is sufficiently larger than a width of the outer peripheral surface and the inner peripheral surface of the yoke of the electromagnet. Coupling characterized by being widely formed.   The coupling according to any one of claims 1 to 3, wherein the cylindrical member and the axial side wall member of the case-like torque transmitting member are screwed to each other, and are screwed. An end face on the outer peripheral side of the axial side wall member from the portion is provided so as to protrude in the axial direction.   The coupling according to any one of claims 1 to 3, wherein the cylindrical member of the case-like torque transmitting member and the axial side wall member are connected by a snap ring mounted in a groove of the cylindrical member. Coupling characterized by being made.

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