JP2009162326A - Power transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transmission device capable of preventing occurrence of drag torque due to residual magnetism while suppressing an increase in size of the device. <P>SOLUTION: The power transmission device 1 includes a first rotating member 3, a second rotating member 5 arranged rotatably relative to the first rotating member 3, a first connecting/disconnecting section 9 disposed between the first and second rotating members 3, 5 for connecting/disconnecting the first and second rotating members 3, 5, an armature 11 disposed axially movably so as to actuate the first connecting/disconnecting section 9, an electromagnet 13 positioned opposite to the armature 11 with the first connecting/disconnecting section 9 interposed therebetween so as to actuate the armature 11, and an opposed member 15 positioned opposite to the first connecting/disconnecting section 9 with the armature 11 interposed therebetween. The opposed member 15 is integrally provided with an attraction member 17 for attracting the armature 11 to the opposed member 15 so as to separate the armature 11 and the first connecting/disconnecting section 9 from each other when energization of the electromagnet 13 is stopped. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power transmission device applied to a vehicle.

  Patent Document 1 describes a clutch device that fastens a main clutch via an amplification mechanism by fastening a pilot clutch. In this clutch device, the amplifying mechanism is provided with a drop prevention portion for preventing the clutch plate of the pilot clutch from dropping, thereby preventing the clutch plate from dropping when assembled or when the pilot clutch is operated.

  By the way, the pilot clutch as described above is intermittently operated by an electromagnet and an armature that moves in an engagement direction of the pilot clutch by energizing the electromagnet. In such a mechanism that intermittently operates the pilot clutch using the electromagnet, when the energization to the electromagnet is stopped, the attracting state of the armature is maintained by the residual magnetism, and drag torque is generated in the pilot clutch. there were.

Therefore, in Patent Document 2, a permanent magnet positioning member that attracts the armature to form a gap between the armature and the friction clutch when the friction clutch is released is mounted on the rotating case. Thereby, generation | occurrence | production of the drag torque in a pilot clutch by residual magnetism can be prevented.
Japanese Patent Laid-Open No. 2004-232685 Japanese Utility Model Publication No. 6-16731

  However, in Patent Document 2, a permanent magnet positioning member that attracts the armature when the friction clutch is released is provided between the pinion carrier (opposing member) and the armature. For this reason, it is necessary to provide a space for positioning the permanent magnet positioning member between the pinion carrier, the armature, and the case, and it is necessary to increase the size of the device in order to ensure the outer diameter side overhang and the axial interference prevention space. there were.

  Therefore, an object of the present invention is to provide a power transmission device that can prevent the generation of drag torque due to residual magnetism while suppressing an increase in the size of the device.

  According to a first aspect of the present invention, there is provided a first rotating member, a second rotating member arranged to be rotatable relative to the first rotating member, the first rotating member, and the second rotating member. A first interrupting portion that is disposed between and interrupts the first rotating member and the second rotating member, an armature that is disposed so as to be axially movable and intermittently operates the first interrupting portion, and the first A power transmission device comprising: an electromagnet arranged to face the armature with one interrupted portion sandwiched therebetween and actuating the armature; and a facing member placed to face the first interrupted portion sandwiched with the armature, One of the armature and the opposing member is integrally provided with a suction member that attracts the armature to the opposing member side by stopping energization of the electromagnet and separates the armature and the first intermittent portion. Being And butterflies.

  A second aspect of the present invention is the power transmission device according to the first aspect, wherein a plurality of the suction members are provided in a circumferential direction on either the armature or the opposing member.

  A third aspect of the present invention is the power transmission device according to the first aspect, wherein the suction member is provided as one member continuous in a circumferential direction on either the armature or the opposing member. Features.

  A fourth aspect of the present invention is the power transmission device according to any one of the first to third aspects, wherein the third rotating member is disposed so as to be rotatable relative to the second rotating member, and the first rotating member. A second interrupting portion that is disposed between the second rotating member and the third rotating member and interrupts the second rotating member and the third rotating member, and the opposing member includes the second rotating member and the third rotating member. It is a pressing member that intermittently operates the second intermittent portion by connecting the first rotational member and the second rotational member.

  In the power transmission device according to claim 1, a suction member for attracting the armature to the opposing member side by stopping energization of the electromagnet to one of the armature and the opposing member to separate the armature from the first intermittent portion is integrated. Therefore, when the energization to the electromagnet is stopped, the armature can be attracted to the opposing member side to provide a separation gap at the first intermittent portion, and drag torque is generated at the first intermittent portion. There is nothing.

  Further, since the suction member is provided integrally with either the armature or the opposing member, there is no need to secure a dedicated space for arranging the suction member, and the space for arranging the constituent members of the apparatus should not be changed as much as possible. That's it.

  Therefore, it is possible to prevent the generation of drag torque due to residual magnetism while suppressing an increase in the size of the device.

  In the power transmission device according to the second aspect, since a plurality of suction members are provided in the circumferential direction on one of the armature and the opposing member, an attractive member capable of attracting the armature to the opposing member side when energization to the electromagnet is stopped is provided. What is necessary is just to provide, and a suction member can be reduced in cost.

  In the power transmission device according to the third aspect, since the suction member is provided as one continuous member in the circumferential direction on either the armature or the opposing member, the number of parts of the suction member can be reduced, and the armature Can be sucked in the entire circumferential direction, and the suction force can be improved.

  The power transmission device according to claim 4 includes a pressing member that intermittently connects the armature and the second intermittent portion, even when the power transmission device includes the second intermittent portion that interrupts the second rotational member and the third rotational member. By providing the suction member integrally with any one of these, it is not necessary to change the arrangement design of the constituent members of the apparatus.

(First embodiment)
The first embodiment will be described with reference to FIG.

  The power transmission device 1 according to the present embodiment includes a cam ring 3 (first rotating member), an outer rotating member 5 (second rotating member) disposed so as to be rotatable relative to the cam ring 3, the cam ring 3, and an outer rotating member. 5, a first interrupting portion 9 having a clutch plate 7 that is arranged between the cam ring 3 and the outer rotating member 5, and an armature 11 that is arranged so as to be axially movable and that intermittently operates the first interrupting portion 9. An electromagnet 13 that is disposed opposite to the armature 11 with the first interrupting portion 9 interposed therebetween and operates the armature 11, and a pressure ring 15 (opposing member) that is disposed opposite to the first interrupting portion 9 with the armature 11 interposed therebetween. It has. Then, the pressure member 15 (any one of the armature and the opposing member) attracts the armature 11 toward the pressure ring 15 by stopping energization of the electromagnet 13 and separates the armature 11 and the first intermittent portion 9 from each other. 17 is provided integrally.

  A plurality of suction members 17 are provided on the pressure ring 15 in the circumferential direction.

  Furthermore, the inner side rotation member 19 arrange | positioned so that relative rotation with the outer side rotation member 5 and the outer side rotation member 5 and the inner side rotation member 19 which are arrange | positioned between the outer side rotation member 5 and the inner side rotation member 19 is interrupted 2nd. The pressure ring 15 (pressing member) intermittently operates the second intermittent portion 21 by connecting the cam ring 3 and the outer rotating member 5.

  As shown in FIG. 1, the power transmission device 1 includes an outer rotating member 5, an inner rotating member 19, a first intermittent part 9, an electromagnet 13, an intermittent operation part 23, and a second intermittent part 21. It is composed of

  The outer rotating member 5 includes a clutch housing 25 and a rotor housing 27. The clutch housing 25 includes a shaft-shaped portion 29 and a tubular portion 31. The shaft portion 29 is rotatably supported by a casing (not shown) via a bearing 33. A spline-shaped connecting portion 35 is formed on the outer periphery of the shaft-like portion 29 and connected to an input member or an output member (not shown). The cylindrical portion 31 is formed of a single member that is continuous with the shaft-shaped portion 29. The cylindrical portion 31 is formed with a hole portion 37 for supplying lubricating oil to the inside of the outer rotating member 5 on one side, and is closed by a lid member 39. Further, a threaded portion 41 is formed at the other end of the tubular portion 31 and is fixed to the rotor housing 27 by a lock nut function that is fixed to the rotor housing 27 and fixed by the nut 43. . The rotor housing 27 is made of a magnetic material and rotates integrally with the clutch housing 25. An O-ring 45 serving as a seal member that partitions the inside and outside of the outer rotating member 5 is disposed between the rotor housing 27 and the clutch housing 25. An inner rotating member 19 is disposed on the inner peripheral side of the outer rotating member 5.

  The inner rotating member 19 is supported in the radial direction so as to be rotatable relative to the outer rotating member 5 via bearings 47 and sliding bushes 49 at both axial ends with respect to the clutch housing 25 and the rotor housing 27. A spline-shaped connecting portion 51 is formed on the inner peripheral side of the inner rotating member 19 and connected to an input member or an output member (not shown). In addition, an X ring 53 as a seal member is disposed between the inner rotating member 19 and the rotor housing 27, and a partition wall 55 is provided inside the inner rotating member 19, so Is partitioned. The inner rotating member 19 is intermittently connected to the outer rotating member 5 by the first intermittent portion 9 and the second intermittent portion 21.

  The first intermittent portion 9 includes the clutch plate 7, the first sliding portion 57 of the rotor housing 27, and the second sliding portion 59 of the armature 11. The clutch plate 7 is connected to the outer periphery of the cam ring 3 so as to be movable in the axial direction and integrally rotatable with the cam ring 3. The armature 11 is disposed opposite to the rotor housing 27 with the clutch plate 7 interposed therebetween. The armature 11 is made of a magnetic material and is coupled to the inner periphery of the cylindrical portion 31 of the clutch housing 25 so as to be movable in the axial direction. The armature 11 does not need to be connected to the clutch housing 25 and may be arranged so as to be movable in the axial direction. A first sliding portion 57 and a second sliding portion 59 are provided at portions of the rotor housing 27 and the armature 11 that slide with the clutch plate 7. The first and second sliding portions 57 and 59 are surface-treated so that the sliding surfaces are harder than other portions. The first intermittent portion 9 is actuated by energizing the electromagnet 13.

  The electromagnet 13 includes an electromagnetic coil 61 and a core 63, is supported by the rotor housing 27 via a bearing 65, and is prevented from rotating by a rotation preventing member 67 with respect to the casing. The core 63 is provided with a lead wire (not shown) connected to a controller (not shown) that controls energization, and the electromagnetic coil 61 is energized under the control of the controller. By energizing the electromagnet 13, the magnetic lines of force through the core 63, the rotor housing 27, the clutch plate 7, and the armature 11 are circulated to form a magnetic flux loop, and the armature 11 moves to the electromagnet 13 side to cause the first intermittent operation. In the portion 9, the first sliding portion 57 of the rotor housing 27, the second sliding portion 59 of the armature 11, and the clutch plate 7 slide. As a result, the cam ring 3 and the outer rotating member 5 are connected, a differential rotation occurs between the cam ring 3 and the pressure ring 15, and a cam thrust force is generated at the intermittent operation portion 23.

  The intermittent operation unit 23 includes a pressure ring 15, a cam ring 3, and a cam ball 69. The pressure ring 15 is disposed so as to face the first intermittent portion 9 with the armature 11 interposed therebetween, and is connected to the outer periphery of the inner rotating member 19 so as to be axially movable, and presses the second intermittent portion 21. The cam ring 3 is arranged on the outer periphery of the inner rotary member 19 so as to be movable in the axial direction and to be rotatable relative to the outer rotary member 5. A thrust bearing 71 that receives a thrust force is disposed between the cam ring 3 and the rotor housing 27. The cam ball 69 is disposed between the pressure ring 15 and the cam ring 3. The cam ball 69 generates a cam thrust force that causes the pressure ring 15 to move in the axial direction toward the second intermittent portion 21 by causing a differential rotation between the pressure ring 15 and the cam ring 3 due to the connection of the first intermittent portion 9. generate.

  The second intermittent portion 21 has a plurality of outer clutch plates that are axially movable on the inner periphery of the cylindrical portion 31 of the clutch housing 25 and are coupled to the clutch housing 25 so as to be rotatable integrally with the clutch housing 25, and a shaft on the outer periphery of the inner rotating member 19 It is composed of a plurality of inner clutch plates that can move in the direction and are connected to the inner rotary member 19 so as to be integrally rotatable. The second intermittent portion 21 is pressed and connected to the pressure ring 15 moved by the cam thrust force generated in the intermittent operation portion 23 by the connection of the first intermittent portion 9, and the outer rotating member 5 and the inner rotating member are connected. 19 is connected.

  Thus, the first interrupter 9 connected by energizing the electromagnet 13 must be disconnected when the electromagnet 13 is de-energized. However, even when the electromagnet 13 is stopped, the armature 11 is caused by residual magnetism. May be sucked in the connecting direction of the first interrupted portion 9. Therefore, the pressure ring 15 is integrally provided with a suction member 17 that sucks the armature 11 toward the pressure ring 15 when the energization of the electromagnet 13 is stopped.

  The attraction member 17 is made of a permanent magnet, and is formed at three locations (plural) on the portion facing the circumferential armature 11 of the pressure ring 15, and one magnetic pole of the attraction member 17 is formed on the annular meat portion of the pressure ring 15. It is provided so as to be embedded in the recess 16. The suction member 17 is disposed inside the pressure ring 15 surrounded by a convex portion 73 protruding to the armature 11 side. The protrusion 73 has a core function (a yoke function) that covers the suction member 17 and can improve the magnetic force of the suction member 17. For this reason, the suction member 17 can be reduced in size, and an increase in cost and an increase in arrangement space can be suppressed. Further, the suction member 17 is prevented from falling off by caulking part of the convex part 73, but the suction member 17 is adhered to the inside surrounded by the convex part 73 without caulking part of the convex part 73. May be. Further, wear powder such as iron powder formed by sliding can be stored in the recess 75 formed by the tip of the projection 73 and the tip of the suction member 17. In addition, you may make the front-end | tip of the suction member 17 project and oppose to the armature 11 side as a protrusion or a surface, without forming the convex part 73.

  Such an attraction member 17 attracts the armature 11 to the pressure ring 15 side when the energization to the electromagnet is stopped to separate the armature 11 from the first intermittent portion 9. At this time, the pressure ring 15 tries to move so as to be attracted by the armature 11 but does not move because the position with the rotor housing 27 is fixed by the cam ball 69, the thrust bearing 71, and the like. For this reason, only the armature 11 whose position on the pressure ring 15 side is not defined is sucked and moved to the pressure ring 15 side. Note that the suction member 17 may be provided integrally with the armature 11 and the armature 11 may be moved to the pressure ring 15 side. In addition, the suction member 17 may be provided at a minimum required number for sucking the armature 11 at a required portion in the circumferential direction of the pressure ring 15 or the armature 11.

  In such a power transmission device 1, the pressure member 15 is integrally provided with a suction member 17 that attracts the armature 11 toward the pressure ring 15 by stopping energization of the electromagnet 13 and separates the armature 11 from the first intermittent portion 9. Therefore, no drag torque is generated in the first intermittent portion 9 when the energization to the electromagnet 13 is stopped.

  Further, since the suction member 17 is provided integrally with the pressure ring 15, it is not necessary to secure a dedicated arrangement space for the suction member 17, and it is not necessary to change the arrangement space for the constituent members of the apparatus as much as possible.

  Therefore, it is possible to prevent the generation of drag torque due to residual magnetism while suppressing an increase in the size of the device.

  Further, since a plurality of suction members 17 are provided in the circumferential direction on the pressure ring 15, it is only necessary to provide suction members that can suck the armature 11 toward the pressure ring 15 when energization to the electromagnet 13 is stopped. Cost can be increased.

  Further, the suction member 17 is integrally provided on the pressure ring 15 (opposing member) (or the armature 11), so that the suction member can be assembled before the assembly of the device as in the prior art. Attaching is also easy.

(Second Embodiment)
A second embodiment will be described with reference to FIG.

  In the power transmission device 101 of the present embodiment, the suction member 103 is provided as a single member that is continuous with the pressure ring 15 in the circumferential direction. In addition, although the same code | symbol is attached | subjected to the structure same as 1st real form, description is abbreviate | omitted, but since it is the same structure as 1st real form, the effect obtained is that the suction member 103 is cyclic | annular It is the same except for the effect.

  As shown in FIG. 2, the attraction member 103 is made of a permanent magnet, and is one member continuous to a portion facing the armature 11 in the circumferential direction of the pressure ring 15, i.e., one magnetic pole of the attraction member 103 is annular. Embedded in a concave portion 16 formed in the annular meat portion. The suction member 103 is disposed inside the pressure ring 15 surrounded by convex portions 105 and 107 protruding to the armature 11 side. The convex portions 105 and 107 have a yoke function, can improve the magnetic force of the suction member 103, and can reduce the size of the suction member 103. The suction member 103 can suck the armature 11 in the entire circumferential direction, and is formed in an annular shape, so that the number of parts can be reduced and the axial thickness can be reduced. Can be The suction member 103 may be provided integrally with the armature 11.

  In such a power transmission device 101, since the suction member 103 is provided as a single member that is continuous with the pressure ring 15 in the circumferential direction, the number of parts of the suction member 103 can be reduced, and the armature 11 can be moved in the circumferential direction. Suction can be performed in the entire region, and the suction force can be improved while suppressing the axial thickness.

  In addition, although pressure ring was shown as an opposing member, not only this but what kind of member may be sufficient if it is a member arrange | positioned facing the 1st intermittent part on both sides of an armature, The suction member may be provided integrally, or the pressure ring itself as the opposing member may be magnetized. Also in this case, it is not necessary to change the arrangement space of the constituent members of the apparatus as much as possible.

  Moreover, although each embodiment uses the opposing member as pressure ring, if it is a member which opposes an armature, not only this but a rotary body or a fixed body may be sufficient.

It is sectional drawing of the power transmission device of 1st Embodiment. It is a side view of the pressure ring of 1st Embodiment. It is a principal part expanded sectional view of the power transmission device of 1st Embodiment. It is sectional drawing of the power transmission device of 2nd Embodiment. It is a side view of the pressure ring of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,101 ... Power transmission device 3 ... Cam ring (1st rotation member)
5 ... Outer rotating member (second rotating member)
DESCRIPTION OF SYMBOLS 9 ... 1st intermittent part 11 ... Armature 13 ... Electromagnet 15 ... Pressure ring (opposing member, pressing member)
17, 103 ... suction member 19 ... inner rotating member (third rotating member)
21 ... 2nd intermittent part

Claims (4)

A first rotating member; a second rotating member disposed so as to be rotatable relative to the first rotating member; and the first rotating member disposed between the first rotating member and the second rotating member. A first intermittent portion that intermittently connects the rotating member and the second rotational member, an armature that is arranged so as to be axially movable and intermittently operates the first intermittent portion, and sandwiches the first intermittent portion A power transmission device comprising: an electromagnet arranged to face the armature and actuating the armature; and a facing member arranged to face the first intermittent portion with the armature interposed therebetween,
One of the armature and the opposing member is integrally provided with a suction member that attracts the armature to the opposing member side by stopping energization of the electromagnet and separates the armature and the first intermittent portion. A power transmission device characterized by that. The power transmission device according to claim 1,
The power transmission device according to claim 1, wherein a plurality of the suction members are provided in a circumferential direction on one of the armature and the opposing member. The power transmission device according to claim 1,
The power transmission device according to claim 1, wherein the suction member is provided as one member continuous in a circumferential direction on one of the armature and the opposing member. The power transmission device according to any one of claims 1 to 3,
A third rotating member disposed so as to be rotatable relative to the second rotating member; and the second rotating member and the third rotating member disposed between the second rotating member and the third rotating member. A second interrupting portion for interrupting the rotating member of
The power transmission device according to claim 1, wherein the facing member is a pressing member that intermittently operates the second intermittent portion by connecting the first rotating member and the second rotating member.

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