JP2006349109A - Rotation transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily release the connection of a wet multidisk clutch in a rotation transmitting device for controlling the connection and disconnection of the wet multidisk clutch by an electromagnetic clutch part taking an electromagnet as a driving source. <P>SOLUTION: A wet-type multidisk clutch 7 is assembled between an outer ring 3 and an inner ring 5. An electromagnetic clutch part 10A which takes an electromagnet 13 as a driving source and forces an armature 11 into attraction onto a rotor 12 mounted on the outer ring 3 by energization with respect to the electromagnet 13 and axial force load part 10B for applying the axial force to the wet multidisk clutch 7 by relatively rotating the armature 11 with respect to a pressure plate 21 prevented from rotating by an inner ring 5 and axially moving a pressure plunger 21 by a ball cam 22 when the armature 11 of the electromagnetic clutch part 10A is fastened to the outer ring 3, are provided to one side in an axial direction of the wet multidisk clutch 7. A switch spring 30 is assembled between the armature 11 and the inner ring 5. When the energization of the electromagnet 13 is shut off, the armature 11 is returned to an intermediate position with the switch spring 30 so as to facilitate disconnection of the wet multidisk clutch 7. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotation transmission device used for switching between power transmission and cutoff on a power transmission path.

  In an FR-based four-wheel drive vehicle, a rotation transmission device described in Patent Document 1 is conventionally known as a rotation transmission device that transmits and interrupts driving force to a front wheel as an auxiliary drive wheel.

  The rotation transmission device incorporates an output member into an input member to which a driving force from the transmission is input and supports the output member in a relatively rotatable manner, and is input by an axial force applied between the input member and the output member. A wet multi-plate clutch for coupling the member and the output member is incorporated, and a clutch control device for controlling coupling and decoupling of the wet multi-plate clutch is provided on one axial side of the wet multi-plate clutch.

  Here, the clutch control device includes an electromagnetic clutch unit, and an axial force load unit that converts the rotational torque of the input member into an axial force when the electromagnetic clutch unit is engaged, and loads the axial force on the wet multi-plate clutch. The electromagnetic clutch portion includes an armature that is guided by the inner diameter surface of the input member and is movable in the axial direction, a rotor that is attached to the input member and faces the armature in the axial direction, and faces the rotor in the axial direction. The armature is attracted to the rotor by energizing the electromagnetic coil of the electromagnet to couple the input member and the armature.

  On the other hand, the axial force load section incorporates a pressure plate between the armature and the wet multi-plate clutch, prevents the pressure plate from rotating around the output member, and supports it so that it can move in the axial direction. The opposing surface of the pressure plate and the armature Each cam groove is provided with a groove depth that gradually decreases from the center toward both ends in the circumferential direction. Balls are assembled between the cam grooves, and the pressure plate is moved in the axial direction by the relative rotation of the armature with respect to the pressure plate. An axial force is applied to the multi-plate clutch.

In the rotation transmission device, when the electromagnetic clutch portion is turned on by energization of the electromagnet, an axial force (axial thrust) is generated in the axial force load portion, and the wet multi-plate clutch is brought into a coupled state by the axial force, Since the armature is pressed against the rotor by the reaction force of the axial force applied to the wet multi-plate clutch, the wet multi-plate clutch can be maintained in the coupled state (locked state) even with a slight electromagnetic clutch torque.
JP 2005-48788 A

  By the way, in the conventional rotation transmission device, the axial force (reaction force) is applied to the armature even when the electromagnetic clutch portion is turned off when the wet multi-plate clutch is disengaged, and the axial thrust is Since the armature serves as a rotational resistance, the armature may not be rotated back to the neutral position.

  In addition, since the viscosity of the sealed oil is high at low temperatures, the armature is pressed against the pressure plate by the frictional torque applied from the input member due to the viscous resistance of the sealed oil when the input member with the electromagnetic clutch turned off is idle. Relative rotation may occur and axial thrust is generated in the axial force load portion, and the wet multi-plate clutch may be unintentionally coupled.

  Further, when the output member is suddenly decelerated when the electromagnetic clutch portion is OFF, the armature rotates due to the rotation inertia, and axial force is generated in the axial force load portion, and the wet multi-plate clutch may be coupled.

  Further, in the conventional rotation transmission device, since the armature is guided by the input member, when the input member idling with the electromagnetic clutch portion turned off, the viscous resistance of the sealed oil is easily applied to the armature and is loaded from the input member. The rubbing torque causes the armature to rotate, generating axial thrust, and is very likely to engage the wet multi-plate clutch.

  An object of the present invention is to rotate a wet multi-plate clutch incorporated between an input member and an output member by an electromagnetic clutch control unit comprising an electromagnetic clutch unit and an axial force load unit. In the transmission device, it is possible to easily release the coupling of the wet multi-plate clutch when the electromagnetic clutch portion is OFF, and to prevent the wet multi-plate clutch from malfunctioning when the input member idles or when the output member suddenly decelerates. It is to be.

  In order to solve the above-described problems, in the first invention, the input member and the output member are arranged inside and outside and are relatively rotatably supported, and an axial force applied between the input member and the output member. A wet multi-plate clutch for coupling the input member and the output member is incorporated, and a clutch control device for controlling the coupling and decoupling of the wet multi-plate clutch is provided on one side in the axial direction of the wet multi-plate clutch. An electromagnetic clutch portion that attracts an armature to a rotor attached to the input member by energizing the electromagnet, and a control device that converts the rotational torque of the input member into an axial force when the armature is attracted, and converts the axial force to a wet multi-plate A pressure plate that includes an axial force load portion that loads the clutch, the axial force load portion being prevented from rotating by the armature and the output member, and movable in the axial direction In the rotation transmission device having a configuration in which cam grooves each having a groove depth gradually decreasing toward both ends in the circumferential direction are provided on each opposing surface, and a ball is incorporated between the cam grooves, the armature and the output member are arranged between each other. Thus, a configuration is adopted in which an elastic member is provided that is elastically deformed by relative rotation of the armature with respect to the pressure plate, and that returns and rotates the armature at a neutral position where the ball is disposed at the center of the cam groove by its restoring elasticity.

  In the second aspect of the invention, the input member and the output member are disposed inside and outside and supported so as to be relatively rotatable, and the input member and the output member are caused by the axial force applied between the input member and the output member. A wet multi-plate clutch is incorporated, and a clutch control device for controlling the coupling and decoupling of the wet multi-plate clutch is provided on one side of the wet multi-plate clutch in the axial direction. An electromagnetic clutch part that attracts the armature to the rotor attached to the input member by means of an axial force load that converts the rotational torque of the input member to axial force when the armature is attracted and loads the axial force to the wet multi-plate clutch The axial force load portion is formed around the armature and the output member, and is rotated around each opposing surface of the pressure plate that is movable in the axial direction. In the rotation transmission device having a structure in which a cam groove whose groove depth gradually decreases toward both ends of the arm and a ball is incorporated between the cam grooves, the armature of the armature with respect to the pressure plate is interposed between the armature and the pressure plate. A configuration is adopted in which an elastic member is provided that is elastically deformed by relative rotation and that returns and rotates the armature at a neutral position where the ball is disposed in the center of the cam groove by its restoring elasticity.

  In the rotation transmission device according to the first and second inventions, when the armature is rotatably supported by the output member, a relatively large gap can be secured between the opposing surfaces of the input member and the armature. At the time of idling of the input member in which is turned OFF, it is possible to reduce the rubbing torque applied to the armature from the input member through the sealed oil. For this reason, the armature does not rotate relative to the pressure plate, and no axial force is generated in the axial force load portion, so that it is possible to more effectively prevent the malfunction that the wet multi-plate clutch is coupled. be able to.

  The wet multi-plate clutch is released by incorporating an elastic member between the armature and the output member as in the first invention, or by providing an elastic member between the armature and the pressure plate as in the second invention. Therefore, when the electromagnetic clutch portion is turned OFF, the armature is returned to the neutral position by the restoring elasticity of the elastic member, and the coupling of the wet multi-plate clutch can be easily released.

  Also, when the input member idling with the electromagnetic clutch part turned OFF, the armature does not rotate even if a rubbing torque is applied from the input member to the armature due to the viscous resistance of the enclosed oil, and the armature is relative to the pressure plate. Does not rotate. For this reason, since an axial force does not generate | occur | produce in an axial force load part, it can prevent that a wet multi-plate clutch malfunctions.

  Furthermore, when the input member is idling, it is possible to prevent the armature from rotating due to inertial force even if the output member is suddenly decelerated, and to prevent the wet multi-plate clutch from malfunctioning.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a housing 1 as a stationary member has an end wall 2 at one end.

  An outer ring 3 as an input member is incorporated in the housing 1. The outer ring 3 is rotatably supported by a bearing 4 incorporated in the other end of the housing 1.

  An inner ring 5 as an output member is incorporated inside the outer ring 3, and both wheels 3 and 5 are relatively rotatable by a bearing 6 incorporated between the inner ring 5 and the outer ring 3.

  A wet multi-plate clutch 7 is incorporated between the outer ring 3 and the inner ring 5. The wet multi-plate clutch 7 includes a large number of input side clutch plates 8 and a large number of output side clutch plates 9. The input side clutch plate 8 and the output side clutch plate 9 are alternately assembled in the axial direction, and the input side clutch plate 8 is supported so as to be prevented from rotating with respect to the outer ring 3 and movable in the axial direction. On the other hand, the output side clutch plate is supported by the inner ring 5 so as to be movable in the axial direction.

  The input-side clutch plate 8 and the output-side clutch plate 9 are brought into close contact with each other by the applied axial force, and transmit the rotation of the outer ring 3 to the inner ring 5.

  On one side in the axial direction of the wet multi-plate clutch 7, a clutch control device 10 that controls the coupling and decoupling of the wet multi-plate clutch 7 is provided.

  The clutch control device 10 includes an electromagnetic clutch portion 10A and an axial force load portion 10B that converts the rotational torque of the outer ring 3 into an axial force and loads the wet multi-plate clutch 7 when the electromagnetic clutch portion 10A is engaged.

  The electromagnetic clutch portion 10 </ b> A includes an armature 11, a rotor 12 provided on one side of the armature 11, and an electromagnet 13 provided on one side of the rotor 12.

  The armature 11 is fitted to an end of the inner ring 5 and is rotatable and axially movable with the outer diameter surface of the inner ring 5 as a guide surface.

  The rotor 12 has an outer cylinder part 12a and an inner cylinder part 12b, and a male screw 14 is formed on the outer periphery of the outer cylinder part 12a. The rotor 12 is fixed to the outer ring 3 by screwing a male screw 14 into a female screw 15 formed on the inner periphery of one end of the outer ring 3, and is loosened by tightening a lock nut 16 that is screw-engaged with the female screw 15. A minute air gap 17 is formed between the rotor 12 and the armature 11, and the air gap 17 can be adjusted by adjusting the screwing amount of the rotor 12. A separation spring 18 that urges the armature 11 in a direction away from the rotor 12 is incorporated between the rotor 12 and the armature 11.

  The electromagnet 13 is incorporated between the outer cylinder portion 12 a and the inner cylinder portion 12 b of the rotor 12. The electromagnet 13 includes an electromagnetic coil 13 a and a core 13 b that supports the electromagnetic coil 13 a and is supported by the housing 1, and magnetic flux flows through the core 13 b, the rotor 12, and the armature 11 when the electromagnetic coil 13 a is energized. Thus, the armature 11 is adsorbed to the rotor 12. By the adsorption, the armature 11 is coupled to the outer ring 3, and the armature 11 rotates together with the outer ring 3.

  As shown in FIGS. 1 to 3, the axial force load portion 10 </ b> B is provided with a pressure plate 21 between the armature 11 and the wet multi-plate clutch 7, and prevents the pressure plate 21 from rotating on the inner ring 5, and also in the axial direction. The ball cam 22 is provided between the opposing surfaces of the pressure plate 21 and the armature 11. Here, the ball cam 22 is provided with cam grooves 22a and 22b in which the groove depth gradually decreases from the center to both ends in the circumferential direction on the opposing surfaces of the pressure plate 21 and the armature 11, and the ball cam 22 is provided between the cam grooves 22a and 22b. 24, and the armature 11 is rotated relative to the pressure plate 21 so that the pressure plate 21 is moved toward the wet multi-plate clutch 7 to push the wet multi-plate clutch 7 in the axial direction. .

  As shown in FIGS. 1, 2, and 4, a switch spring 30 as an elastic member is incorporated in an end portion of the inner ring 5 located on the axial force load portion 10 </ b> B side. The switch spring 30 has a C shape, and a pair of outwardly pressing pieces 31 are provided at both ends of the switch spring 30. The pair of pressing pieces 31 are formed in the armature 11 from the notches 32 formed at the end portions of the inner ring 5. It inserts in the notch part 33 provided in the periphery, and is pressing in the direction which opposes the end surface which the notch 32 and the notch part 33 oppose in the circumferential direction.

  The switch spring 30 is elastically deformed by the relative rotation of the armature 11 with respect to the inner ring 5, and by its restoring elasticity, the armature 11 is rotated back to the neutral position where the ball 24 is disposed in the center of the cam grooves 22a and 22b. Yes.

  The rotation transmission device shown in the embodiment has the above structure, and an input shaft is connected to the outer ring 3 and an output shaft is connected to the inner ring 5. In order to connect the input shaft and the output shaft, spline teeth 40 and 41 are provided on the inner periphery of the outer ring 3 and the inner ring 5.

  FIG. 1 shows a state in which energization is interrupted with respect to the electromagnetic coil 13a of the electromagnet 13, and the wet multi-plate clutch 7 is in a disengaged state. For this reason, even if the outer ring 3 rotates, the rotation is not transmitted to the inner ring 5, and only the outer ring 3 rotates freely.

  When the electromagnetic coil 13a of the electromagnet 13 is energized in the rotating state of the outer ring 3, magnetic flux flows through the core 13b, the rotor 12 and the armature 11, and a magnetic attractive force acts between the rotor 12 and the armature 11, and the magnetic attractive force causes the armature. 11 is attracted to the rotor 12, the outer ring 3 and the armature 11 are coupled, and the armature 11 rotates together with the outer ring 3.

  Further, the armature 11 rotates relative to the pressure plate 21, and by the relative rotation, as shown in FIG. 3B, the cam groove 22 b formed in the armature 11 and the cam groove 22 a formed in the pressure plate 21. However, since the phase is shifted in the circumferential direction, the pressure plate 21 moves to the wet multi-plate clutch 7 side and presses the wet multi-plate clutch 7 in the axial direction. By the pressing, the input side clutch plate 8 and the output side clutch plate 9 are in close contact with each other.

  Therefore, the rotation of the outer ring 3 is transmitted to the inner ring 5 via the wet multi-plate clutch 7, and the inner ring 5 rotates in the same direction as the outer ring 3.

  Here, when the pressure plate 21 presses the wet multi-plate clutch 7 in the axial direction, the armature 11 is pressed against the rotor 12 by the reaction force. Therefore, once the electromagnetic clutch portion 10A is engaged, the subsequent electromagnetic coil Even if the current passed through 13a is reduced, the armature 11 is held in the attracted state, and the current consumption can be reduced.

  When the armature 11 rotates relative to the pressure plate 21, the armature 11 rotates relative to the inner ring 5, so that the switch spring 30 is elastically deformed as shown in FIG.

  For this reason, when the energization to the electromagnetic coil 13a is cut off, the armature 11 is rotated by the restoring elasticity of the switch spring 30, and the ball 24 is placed in the center of the cam grooves 22a and 22b as shown in FIGS. The armature 11 is returned to the neutral position where it is placed.

  For this reason, the load of the axial force on the wet multi-plate clutch 7 is released, and the wet multi-plate clutch 7 is released from the engaged state, and transmission of the rotational torque from the outer ring 3 to the inner ring 5 is interrupted.

  As described above, since the armature 11 is returned to the neutral position where the ball 24 is arranged in the center of the cam grooves 22a and 22b by the restoring elasticity of the switch spring 30 by cutting off the energization to the electromagnetic coil 13a, the wet multi-plate clutch 7 Can be easily released.

  When the energization of the electromagnetic coil 13a is interrupted, the armature 11 is elastically held by the switch spring 30 at the neutral position where the ball 24 is disposed in the center of the cam grooves 22a and 22b. Even if a rubbing torque is applied from the outer ring 3 to the armature 11 due to viscous resistance, the armature 11 does not rotate and does not rotate relative to the pressure plate 21.

  For this reason, no axial force is generated in the axial force load portion 10B, and there is no malfunction that the wet multi-plate clutch 7 is coupled.

  Further, when the outer ring 3 is idling, even if the inner ring 5 is suddenly decelerated, the armature 11 is not rotated by the inertial force, and no axial force is generated in the axial force load portion 10B. There is no malfunction that the multi-plate clutch 7 is engaged.

  In the example shown in FIGS. 2 and 4, the switch spring 30 as an elastic member is incorporated between the inner ring 5 and the armature 11, but as shown in FIG. 7, the armature 11 and the pressure plate 21 are arranged between each other. The switch spring 30 may be incorporated. When the switch spring 30 is assembled, a cylindrical portion 34 facing the armature 11 is formed on the outer periphery of the pressure plate 21, and an outer cylinder 35 disposed outside the cylindrical portion 34 is provided on the outer periphery of the armature 11. A switch spring 30 is incorporated in the cylindrical portion 34, and a pair of pressing pieces 31 provided at both ends of the switch spring 30 is changed from a notch 36 formed in the cylindrical portion 34 to a notch portion 37 provided in the outer cylindrical portion 35. It inserts and the end surface which opposes in the circumferential direction of the notch 36 and the notch part 37 is pressed in the opposite direction.

  As described above, by incorporating the switch spring 30 between the armature 11 and the pressure plate 21, the armature 11 can be elastically held at the neutral position where the ball 24 is disposed in the center of the cam grooves 22a and 22b. Therefore, similarly to the case shown in FIG. 4, the connection of the wet multi-plate clutch 7 can be easily released when the energization of the electromagnetic coil 13 a is interrupted. Further, there is no inconvenience that the armature 11 rotates due to the rubbing torque or inertia force during the idling of the outer ring 3, and it is possible to prevent the wet multi-plate clutch 7 from malfunctioning.

Longitudinal front view showing an embodiment of a rotation transmission device according to the present invention Sectional view along the line II-II in FIG. (A) is a cross-sectional view showing an axial force load portion, (B) is a cross-sectional view showing a state when an axial force is generated. FIG. 1 is an enlarged cross-sectional view of the axial force load portion shown in FIG. Sectional view showing the relative rotation of the armature and inner ring Sectional view with armature returned to neutral position Sectional view showing another example of incorporating a switch spring

Explanation of symbols

1 Housing 3 Outer ring (input member)
5 Inner ring (output member)
7 Wet multi-plate clutch 10 Clutch control device 10A Electromagnetic clutch portion 10B Axial force load portion 11 Armature 12 Rotor 13 Electromagnet 21 Pressure plates 22a, 22b Cam groove 24 Ball 30 Switch spring (elastic member)

Claims (3)

  A wet-type multi-plate clutch that incorporates an input member and an output member and supports them relatively rotatably and incorporates the input member and the output member between the input member and the output member by a loaded axial force. A clutch control device for controlling the coupling and decoupling of the wet multi-plate clutch is provided on one side in the axial direction of the wet multi-plate clutch, and the clutch control device is attached to the rotor attached to the input member by energizing the electromagnet. An electromagnetic clutch part that attracts the armature and an axial force load part that converts the rotational torque of the input member into an axial force when the armature is attracted and loads the axial force on the wet multi-plate clutch. The groove depth is gradually increased toward both ends in the circumferential direction on the opposing surfaces of the pressure plate that are prevented from rotating by the armature and the output member and are movable in the axial direction. In a rotation transmission device comprising a cam groove that becomes shallow and a ball is incorporated between the cam grooves, the armature and the output member are elastically deformed by the relative rotation of the armature with respect to the pressure plate, and its restoring elasticity A rotation transmission device characterized in that an elastic member for returning and rotating the armature is provided at a neutral position where the ball is disposed in the center of the cam groove.   A wet-type multi-plate clutch that incorporates an input member and an output member and supports them relatively rotatably and incorporates the input member and the output member between the input member and the output member by a loaded axial force. A clutch control device for controlling the coupling and decoupling of the wet multi-plate clutch is provided on one side in the axial direction of the wet multi-plate clutch, and the clutch control device is attached to the rotor attached to the input member by energizing the electromagnet. An electromagnetic clutch part that attracts the armature and an axial force load part that converts the rotational torque of the input member into an axial force when the armature is attracted and loads the axial force on the wet multi-plate clutch. The groove depth is gradually increased toward both ends in the circumferential direction on the opposing surfaces of the pressure plate that are prevented from rotating by the armature and the output member and are movable in the axial direction. In a rotation transmission device comprising a cam groove that becomes shallow and a ball is incorporated between the cam grooves, the armature and the pressure plate are elastically deformed by the relative rotation of the armature with respect to the pressure plate, and its restoring elasticity A rotation transmission device characterized in that an elastic member for returning and rotating the armature is provided at a neutral position where the ball is disposed in the center of the cam groove.   The rotation transmission device according to claim 1 or 2, wherein the armature is rotatably supported by the output member and is supported so as to be movable in an axial direction.

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