JP2013113373A - Power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power transmission device capable of reducing costs by reducing the number of parts.SOLUTION: A power transmission device 1 includes: an outer side rotation member 3; an inner side rotation member 5; a main clutch 7; a pilot clutch 9 for operating the main clutch 7; an armature 11 for connecting and disconnecting the pilot clutch 9; an electromagnet 13 attracting the armature 11 by excitation to connect the pilot clutch 9; and a cam mechanism 15 operated by connection of the pilot clutch 9 and connecting the main clutch 7. The cam mechanism 15 has a pressure ring 17, and a cam ring 19. The pilot clutch 9 is arranged in an outer diameter side of the cam ring 19, and a magnet flux loop L formed by excitation of the electromagnet 13 is formed via the electromagnet 13, the outer side rotation member 3, the cam ring 19, and the armature 11.

Description

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

  Conventionally, as a power transmission device, a differential case as an outer rotating member, a hub as an inner rotating member arranged so as to be rotatable relative to the differential case, and a power transmission between the differential case and the hub. The main clutch that is operated by the connection of the pilot clutch, the main clutch that operates the main clutch, the armature that connects and disconnects the pilot clutch, the electromagnet that attracts the armature by excitation and connects the pilot clutch A device having a cam mechanism for connecting a clutch is known (for example, see Patent Document 1).

  In this power transmission device, a ring made of a magnetic material is disposed on the outer diameter side of the pilot clutch, and a cam ring of the cam mechanism is disposed on the inner diameter side of the pilot clutch. By arranging the ring and the cam ring on both sides in the radial direction of the pilot clutch in this way, a magnetic flux loop formed by electromagnet excitation is formed through the electromagnet, the differential case, the ring, the armature, and the cam ring, and the magnetic flux is piloted. It does not pass through the clutch. For this reason, it is possible to suppress a decrease in torque response and torque capacity of the pilot clutch.

Japanese Utility Model Publication No. 5-66339

  However, in the power transmission device such as Patent Document 1, a ring for forming a magnetic flux loop without allowing magnetic flux to pass through the pilot clutch is disposed on the outer diameter side of the pilot clutch. The cost was high.

  Therefore, an object of the present invention is to provide a power transmission device that can reduce the number of parts and reduce the cost.

  The present invention includes an outer rotating member, an inner rotating member arranged to be rotatable relative to the outer rotating member, and the outer rotating member and the inner rotating member arranged between the outer rotating member and the inner rotating member. A main clutch for intermittently transmitting power to the pilot, a pilot clutch for operating the main clutch, an armature for intermittently connecting the pilot clutch, an electromagnet for attracting the armature by excitation and connecting the pilot clutch, and the pilot clutch And a cam mechanism for connecting the main clutch, and the cam mechanism is configured to connect the main clutch to the pressure clutch by a differential rotation between the pressure ring and the pressure ring. A cam ring that moves in the connecting direction In the force transmission device, the pilot clutch is disposed on the outer diameter side of the cam ring, and a magnetic flux loop formed by excitation of the electromagnet passes through the electromagnet, the outer rotating member, the cam ring, and the armature. It is characterized by being formed.

  In this power transmission device, a magnetic flux loop formed by excitation of an electromagnet is formed via a cam ring disposed on the inner diameter side of the pilot clutch.

  Therefore, in such a power transmission device, the members disposed on the outer diameter side of the pilot clutch can be reduced, and the cost can be reduced.

  According to the present invention, it is possible to provide a power transmission device that can reduce the number of parts and reduce the cost.

It is sectional drawing of the power transmission device which concerns on embodiment of this invention.

  A power transmission apparatus according to an embodiment of the present invention will be described with reference to FIG.

  The power transmission device 1 according to the present embodiment includes an outer rotating member 3, an inner rotating member 5 disposed so as to be rotatable relative to the outer rotating member 3, and the outer rotating member 3 and the inner rotating member 5. A main clutch 7 that is arranged and interrupts power transmission between the outer rotating member 3 and the inner rotating member 5, a pilot clutch 9 that operates the main clutch 7, an armature 11 that interrupts the pilot clutch 9, and the armature 11 An electromagnet 13 that is attracted by excitation to connect the pilot clutch 9 and a cam mechanism 15 that is actuated by the connection of the pilot clutch 9 to connect the main clutch 7 are provided.

  The cam mechanism 15 includes a pressure ring 17 for connecting the main clutch 7 and a cam ring 19 for moving the pressure ring 17 in the connecting direction of the main clutch 7 by differential rotation between the pressure mechanism 17 and the pressure ring 17.

  The pilot clutch 9 is disposed on the outer diameter side of the cam ring 19, and the main magnetic flux loop L formed by the excitation of the electromagnet 13 is formed through the electromagnet 13, the outer rotating member 3, the cam ring 19, and the armature 11. Is done.

  The outer rotating member 3 includes a rotor 21 made of a magnetic material disposed between the electromagnet 13 and the pilot clutch 9, and a nonmagnetic member fixed to the rotor 21 so as to rotate together with the main clutch 7. The pilot clutch 9 is connected to the housing 23.

  Further, the armature 11 is urged in the direction of releasing the connection of the pilot clutch 9 by the urging member 25.

  As shown in FIG. 1, the power transmission device 1 includes an outer rotating member 3, an inner rotating member 5, a main clutch 7, a pilot clutch 9, an armature 11, an electromagnet 13, a cam mechanism 15, and the like. ing.

  The outer rotating member 3 is rotatably supported by a stationary member (not shown) such as a carrier or a vehicle body frame via a bearing 27 and includes a rotor 21 and a housing 23.

  The rotor 21 is made of a magnetic material, and is arranged so that one-side extending portions 29 and 31 extending toward the electromagnet 13 in the axial direction and the wall portion 33 cover the periphery of the electromagnet 13, and the wall portion 33 is the electromagnet. 13 and the pilot clutch 9 are arranged between the axial directions. The wall 33 is provided with a magnetic path forming member 35 made of a nonmagnetic material for forming the magnetic flux loop L integrally with the wall 33 by a fixing means such as welding. Further, the rotor 21 is provided with an air gap that is opposed to the core 73 of the electromagnet 13 with a small gap therebetween, so that magnetic flux can be transferred from the core 73 of the electromagnet 13 to the rotor 21. Yes.

  The pilot clutch 9 side of the rotor 21 is an other-side extending portion 37 extending in the axial direction, and a spline-shaped connecting portion 39 is provided on the inner periphery of the other-side extending portion 37. Yes. The housing 23 is connected to the connecting portion 39 so as to be integrally rotatable, and the axial position of the rotor 21 is positioned by abutment between the projecting portion 41 provided on the housing 23 and the end portion, and fixing such as welding is performed. By means, it is fixed so as to be rotatable together with the housing 23.

  The housing 23 is made of a nonmagnetic material such as an aluminum material, and is formed into a bottomed cylindrical shape by forging. A seal ring 43 that partitions the inside of the outer rotating member 3 from the outside is provided between the housing 23 and the rotor 21 in the radial direction. Further, the bottom wall portion 45 of the housing 23 is provided with an injection hole 47 for allowing the lubricating oil to flow into the outer rotating member 3, and after the lubricating oil is injected, it is closed by the lid member 49.

  A spline-shaped engagement portion 51 is formed on the cylindrical inner periphery of the housing 23, and the outer clutch plate of the main clutch 7 is engaged. Further, at the end portion of the housing 23 that is adjacent to the engaging portion 51 in the axial direction, an engaging portion 53 that is opened in the axial direction toward the rotor 21 and is formed in the circumferential direction is formed. The outer plate and the armature 11 are engaged with the recess. The engaging portion 53 is located on the inner peripheral side of the other extending portion 37 of the rotor 21, and the magnetic flux is transmitted to the other extending portion 37 by disposing the engaging portion 53 of a nonmagnetic material. It has a difficult structure.

  The bottom wall portion 45 of the housing 23 is provided with a fixing portion 55 to which a connecting member (not shown) such as a stud bolt is fixed, and any one of the input / output members is rotated through the connecting member. A member (not shown) is coupled to the outer rotating member 3 so as to be integrally rotatable. An inner rotary member 5 is disposed on the rotational axis of the outer rotary member 3 so as to be rotatable relative to the outer rotary member 3.

  The inner rotating member 5 is formed in a hollow shape and is rotatably supported by the outer rotating member 3 via an X ring 57, a sliding bush 59, and a bearing 61 on the outer periphery. The X ring 57 serves as a sealing means for partitioning the outside with respect to the outside after the lubricating oil is sealed inside the outer rotating member 3. A spline-shaped engaging portion 63 is formed on the outer periphery of the inner rotating member 5, and the inner clutch plate of the main clutch 7 and the pressure ring 17 are engaged with each other. In addition, a partition wall 65 is provided as a single member that is continuous with the inner rotating member 5 at the central portion on the axial center side of the inner rotating member 5, and partitions the inside and the outside of the outer rotating member 3.

  A spline-shaped connecting portion 67 is formed on the inner periphery of the inner rotating member 5, and the other rotating member (not shown) of the input / output members is connected to the inner rotating member 5 so as to be integrally rotatable. The driving torque transmitted between the inner rotating member 5 and the outer rotating member 3 is interrupted by the main clutch 7.

  The main clutch 7 includes a plurality of outer clutch plates and a plurality of inner clutch plates. The plurality of outer clutch plates are engaged with an engaging portion 51 formed on the inner periphery of the housing 23 so as to be axially movable and integrally rotatable with the outer rotating member 3. The plurality of inner clutch plates are alternately arranged in the axial direction with respect to the plurality of outer clutch plates, and can be moved in the axial direction by the engaging portions 63 formed on the outer periphery of the inner rotating member 5 so as to rotate integrally with the inner rotating member 5. Engaged as possible.

  The main clutch 7 is a multi-plate clutch composed of a plurality of outer clutch plates and a plurality of inner clutch plates, and is a control type friction clutch capable of intermediate control of transmission torque with sliding friction. The main clutch 7 is operated by the intermittent engagement of the pilot clutch 9, and interrupts the driving torque transmitted between the outer rotating member 3 and the inner rotating member 5.

  The pilot clutch 9 is disposed between the rotor 21 and the armature 11 in the axial direction in the outer rotating member 3. The pilot clutch 9 is axially movable with respect to the engaging portion 53 of the housing 23 and connected to the outer rotating member 3 so as to be integrally rotatable with the outer rotating member 3. It is composed of a plurality of inner plates which are alternately arranged between them and are movable in the axial direction and connected to the cam ring 19 so as to be integrally rotatable.

  Between the plurality of plates of the pilot clutch 9, urging members 25 made up of a single spring for urging the armature 11 in the direction of releasing the connection of the pilot clutch 9 are arranged. The armature 11 and each plate are separated by the urging force of the member 25. For this reason, the armature 11 is attracted and moved by residual magnetism or the like and the pilot clutch 9 is not connected, and the drag torque in the pilot clutch 9 can be reduced. The urging member 25 is not limited to a one-turn spring, but may be a coil spring or a disc spring that is disposed in the concave portion of the engaging portion 53 and urges the armature 11. Such a pilot clutch 9 is connected by the armature 11 being attracted and moved by the excitation of the electromagnet 13.

  The armature 11 is made of a magnetic material, is disposed to face the rotor 21 with the pilot clutch 9 interposed therebetween in the axial direction, is engaged with the engaging portion 53 of the housing 23 in the axial direction, and is engaged with the outer rotating member 3 so as to be integrally rotatable. ing. The armature 11 is attracted and moved to the electromagnet 13 side against the urging force of the urging member 25 by the magnetic flux loop L formed when the electromagnet 13 is excited, and connects the pilot clutch 9.

  The electromagnet 13 is disposed outside the outer rotating member 3 through the bearing 27 in the rotor 21, and is prevented from rotating by a stationary member 69 by a rotation preventing member 69, and includes an electromagnetic coil 71 and a core 73. The electromagnetic coil 71 is molded by an insulating member 75 such as a synthetic resin and disposed inside the core 73.

  The core 73 is made of a magnetic material, and is disposed between the electromagnetic coil 71 and the rotor 21 in the radial direction. An insulating member 75 is disposed on the core 73 so as to protrude outside the outer rotating member 3, and a lead wire 77 is connected to the electromagnetic coil 71 through the insulating member 75. This lead wire 77 is connected to a controller (not shown) for controlling energization arranged outside the outer rotating member 3, and an electromagnetic coil is used to generate a necessary friction torque in the main clutch 7 under the control of the controller. 71 is energized. When the electromagnetic coil 71 is energized, the pilot clutch 9 is connected, and the cam mechanism 15 generates a thrust force.

  The cam mechanism 15 includes a pressure ring 17, a cam ring 19, and a cam ball 79. The pressure ring 17 is arranged to be able to move in the axial direction on the engaging portion 63 of the inner rotating member 5 and to rotate integrally with the inner rotating member 5. The pressure ring 17 is axially moved in the connecting direction of the main clutch 7 by the thrust force generated by the cam mechanism 15, and applies a pressing force to the main clutch 7 to be connected.

  The cam ring 19 is made of a magnetic material, and is arranged on the outer periphery of the inner rotary member 5 so as to be movable in the axial direction. A plurality of inner plates of the pilot clutch 9 can rotate integrally with a spline lug formed on the outer diameter portion of the cam ring 19. It is connected to. In addition, a magnetic path forming member 81 made of a nonmagnetic material for forming the magnetic flux loop L is integrally provided with the cam ring 19 by fixing means such as welding at a radial intermediate portion of the cam ring 19. A thrust bearing 83 that receives a thrust reaction force generated by the cam mechanism 15 is disposed between the cam ring 19 and the rotor 21 in the axial direction, and the end surface of the cam ring 19 does not contact the wall surface of the rotor 21.

  The cam ball 79 has a plurality of cam surfaces formed in the circumferential direction facing the cam ring 19 and the pressure ring 17 and is interposed between the cam surfaces. The cam ball 79 causes the pressure ring 17 to move toward the main clutch 7 with a strength corresponding to the friction torque generated in the pilot clutch 9 by causing a differential rotation between the cam ring 19 and the pressure ring 17 due to the connection of the pilot clutch 9. A cam thrust force is generated for axial movement.

  In the power transmission device 1 configured as described above, when the electromagnet 13 is energized, lines of magnetic force are circulated through the core 73, the one-side extending portions 29 and 31 of the rotor 21, the wall portion 33, the cam ring 19, and the armature 11. Thus, the magnetic flux loop L is formed, the armature 11 is attracted and moved to the electromagnet 13 side, and the pilot clutch 9 is fastened. The fastening torque of the pilot clutch 9 is converted into axial thrust through the cam mechanism 15, and the pressure ring 17 presses the main clutch 7 to connect the main clutch 7. By connecting the main clutch 7, the outer rotating member 3 and the inner rotating member 5 are connected, and the driving torque can be transmitted between the input / output members. Further, the magnetic flux loop L itself can reduce the loop length without forming a loop that encloses the pilot clutch 9 in the magnetic flux loop and makes a detour as in the prior art.

  Thus, the magnetic flux loop L formed by the excitation of the electromagnet 13 is formed without the magnetic flux being transmitted through the pilot clutch 9. For this reason, the torque responsiveness of the pilot clutch 9 can be improved, and the fall of torque capacity can be suppressed. Further, since the outer plate of the pilot clutch 9 is connected to the engaging portion 53 of the housing 23 made of a nonmagnetic material, the magnetic flux does not pass through the outer diameter side of the pilot clutch 9. For this reason, the magnetic flux can be guided to the cam ring 19 disposed on the inner diameter side of the pilot clutch 9, and the magnetic flux loop L can be reduced and the armature 11 can be attracted and moved by the shortest magnetic flux loop L.

  In this power transmission device 1, the magnetic flux loop L formed by the excitation of the electromagnet 13 is formed via the cam ring 19 disposed on the inner diameter side of the pilot clutch 9, so that the magnetic flux is applied to the outer diameter side of the pilot clutch 9. It is possible to prevent the magnetic flux from being transmitted to the pilot clutch 9 without arranging a member to be transmitted.

  Therefore, in such a power transmission device 1, the members disposed on the outer diameter side of the pilot clutch 9 can be reduced, and the cost can be reduced.

  Further, since the member that transmits the magnetic flux is not disposed on the outer diameter side of the pilot clutch 9, the magnetic flux loop L can be reduced, and the armature 11 can be attracted and moved by the shortest magnetic flux loop L. Responsiveness can be improved.

  Further, since the pilot clutch 9 is connected to the housing 23 made of a nonmagnetic material, the magnetic flux does not permeate to the outer diameter side of the pilot clutch 9 in which the housing 23 is disposed, and the magnetic flux is transmitted to the inner diameter of the pilot clutch 9. It can be led to a cam ring 19 arranged on the side.

  Further, since the armature 11 is urged in the direction of releasing the connection of the pilot clutch 9 by the urging member 25, the armature 11 is attracted and moved by residual magnetism or the like in the disconnected state of the pilot clutch 9, so that the pilot clutch 9 is The drag torque in the pilot clutch 9 can be reduced without being connected.

  In the power transmission device according to the embodiment of the present invention, the armature is engaged with the engaging portion of the housing, but the outer diameter side of the armature is supported radially by the inner periphery of the housing, and is movable in the axial direction. The armature may be a non-engaging annular member.

  Also, the input / output relationship between the outer rotating member and the inner rotating member can be any one as long as either one is connected to the input member so as to be integrally rotatable and the other is connected to the output member so as to be integrally rotatable. There may be.

DESCRIPTION OF SYMBOLS 1 ... Power transmission device 3 ... Outer rotating member 5 ... Inner rotating member 7 ... Main clutch 9 ... Pilot clutch 11 ... Armature 13 ... Electromagnet 15 ... Cam mechanism 17 ... Pressure ring 19 ... Cam ring L ... Magnetic flux loop 21 ... Rotor 23 ... Housing 25 ... Biasing member

Claims (3)

An outer rotating member, an inner rotating member disposed so as to be rotatable relative to the outer rotating member, and power transmission between the outer rotating member and the inner rotating member disposed between the outer rotating member and the inner rotating member. Actuated by connecting the pilot clutch, a pilot clutch for operating the main clutch, an armature for connecting and disconnecting the pilot clutch, an electromagnet for attracting the armature by excitation and connecting the pilot clutch And a cam mechanism for connecting the main clutch, and the cam mechanism moves the pressure ring in a connecting direction of the main clutch by a differential rotation between the pressure ring for connecting the main clutch and the pressure ring. Power transmission device having cam ring There is,
The pilot clutch is disposed on the outer diameter side of the cam ring, and a magnetic flux loop formed by excitation of the electromagnet is formed through the electromagnet, the outer rotating member, the cam ring, and the armature. Power transmission device. The power transmission device according to claim 1,
The outer rotating member includes a rotor made of a magnetic material disposed between the electromagnet and the pilot clutch in an axial direction, and a housing made of a non-magnetic material fixed to the rotor so as to be integrally rotatable and connected to the main clutch. The pilot clutch is coupled to the housing. The power transmission device according to claim 1 or 2,
The power transmission device according to claim 1, wherein the armature is urged in a direction of releasing the connection of the pilot clutch by an urging member.

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