JP2007205515A - Rotation transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the weight of a rotation transmission device in which an armature is attracted by a permanent magnet. <P>SOLUTION: A two-way clutch 10 is assembled between an outer ring 1 and an inner ring 2. An electromagnetic clutch 20 is installed together with the two-way clutch 10. The electromagnetic clutch 20 comprises the armature 21 fixedly held on the retainer 14 of the two-way clutch 10, a rotor 22 fitted to the outer ring 1 and facing the armature 21, an electromagnet 23 facing the rotor 22, and a receding spring 24 biasing the armature 21 to recede it from the rotor 22. An annular recess 30 is formed on the outer peripheral surface of the armature attracting surface of the rotor 22, and the receding spring 24 is assembled in the recess 30. Since the thin armature 21 is adopted, the weight of the rotation transmission device can be reduced. <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 or Patent Document 2 is conventionally known as a rotation transmission device that transmits and blocks driving force to a front wheel as an auxiliary drive wheel.

  In the rotation transmission device described in Patent Document 1, a two-way clutch is incorporated between an outer ring and an inner ring incorporated inside the outer ring, and the two-way clutch is engaged and disengaged by an electromagnetic clutch attached to the two-way clutch. The outer ring and the inner ring are coupled by the engagement of the two-way clutch, and the rotational torque is transmitted between the outer ring and the inner ring.

  Here, the two-way clutch is formed with a cylindrical surface on the inner periphery of the outer ring, and provided with a cam surface on the outer periphery of the inner ring that forms a wedge-shaped space in which both ends in the circumferential direction are narrow with the cylindrical surface. An engaging member made of a roller is incorporated between the cam surface and the cylindrical surface, and the engaging member is engaged with the cylindrical surface and the cam surface by the relative rotation of the cage that holds the engaging member and the inner ring. Further, a switch spring is incorporated between the inner ring and the cage, and the cage is elastically held at a neutral position where the engagement element is disengaged from the cylindrical surface and the cam surface by the switch spring.

  On the other hand, an electromagnetic clutch is an armature that is prevented from rotating by a cage and supported so as to be movable in the axial direction, a rotor that is connected to an outer ring and faces the armature in the axial direction, and an electromagnet that faces the rotor in the axial direction And a separation spring that urges the armature in a direction away from the rotor. When the electromagnet is energized, the armature is attracted to the rotor, and the engagement member is moved to the cylindrical surface by the relative rotation of the armature and the inner ring coupled to the outer ring. And it is made to engage with a cam surface.

On the other hand, in the rotation transmission device described in Patent Document 2, in the rotation transmission device described in Patent Document 1, a permanent magnet is incorporated in a slit formed in the rotor, and the permanent magnet resists the elasticity of the separation spring. The armature is urged in the direction to do.
JP 2005-140219 A JP 2004-190730 A

  By the way, in the rotation transmission device described in Patent Document 1, an annular recess is formed on the surface facing the rotor of the armature, and a separation spring is incorporated in the recess, so that the armature is thick. Has the disadvantage of increasing the weight of the rotation transmission device.

  Depending on the position where the recess is formed, a separation spring incorporated in the recess may obstruct the magnetic path between the armature and the rotor, thereby reducing the magnetic efficiency.

  On the other hand, in the rotation transmission device described in Patent Document 2, since a pull-type separation spring is incorporated between the armature and the cage, both ends of the separation spring are connected to the armature and the cage in the radial direction. There is a disadvantage that it is necessary to prevent the movement to the position, and it takes a lot of time to install.

  Such an inconvenience can be solved by adopting the support structure for the separation spring described in Patent Document 1, but the inconvenience as described above occurs due to the adoption.

  An object of the present invention is to reduce the weight of a rotation transmission device that controls a two-way clutch by an electromagnetic clutch.

  In order to solve the above-described problems, in the present invention, an engaging element and a retainer for retaining the engaging element are provided between the outer ring and the inner ring incorporated inside the outer ring, and the engagement is controlled by controlling the rotation of the retainer. A two-way clutch that couples the outer ring and the inner ring by incorporating the joint into the opposing surfaces of the outer ring and the inner ring is incorporated, and an electromagnetic clutch that controls the coupling and decoupling of the two-way clutch is provided along with the two-way clutch. An armature in which the electromagnetic clutch is prevented from rotating with respect to the cage and supported so as to be movable in the axial direction, a rotor connected to the outer ring and facing the armature in the axial direction, and the rotor and the axial direction The rotation consists of an electromagnet that moves in the axial direction when energized, and a separation spring that urges the armature in a direction that separates the armature from the rotor. In reach device, the annular recess formed on the outer peripheral portion of the armature suction surface of the rotor, it was adopted a structure incorporating the separating spring in the recess.

  As described above, by forming an annular recess in the outer peripheral portion of the armature suction surface of the rotor and incorporating a separation spring in the recess, it is possible to adopt a thin armature with a uniform axial thickness. Therefore, it is possible to reduce the weight of the rotation transmission device.

  In addition, since the annular recess is formed in the outer peripheral portion of the armature attracting surface of the rotor, the separation spring incorporated in the recess obstructs the magnetic path between the armature and the rotor, and the occurrence of inconvenience that the magnetic efficiency is reduced In addition, a small electromagnet can be used.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, an inner ring 2 is incorporated inside the outer ring 1, and the outer ring 1 and the inner ring 2 are supported relatively rotatably by a bearing 3.

  A two-way clutch 10 is incorporated between the outer ring 1 and the large-diameter portion 2 a formed on the inner ring 2. As shown in FIGS. 1 and 2, the two-way clutch 10 forms a cylindrical surface 11 on the inner periphery of the outer ring 1, and the outer periphery of the large-diameter portion 2 a of the inner ring 2 is circumferential with the cylindrical surface 11. A flat cam surface 12 that forms a narrow wedge-shaped space at both ends is provided at intervals in the circumferential direction, and an engagement element 13 made of a roller is incorporated between each cam surface 12 and the cylindrical surface 11. Is held by the cage 14.

  Further, a C-shaped switch spring 15 is incorporated in the inner ring 2, and a pair of pressing pieces 15 a formed outward from both ends of the switch spring 15 is connected to the end of the cage 14 from the notch 16 formed on the end surface of the inner ring. Is inserted into a notch 17 provided in the inner surface of the notch 16 and the opposite side surfaces of the notch 16 and the notch 17 are pressed against each other in a direction opposite to each other, whereby the engaging element 13 is pressed against the cylindrical surface 11 and the cam surface 12. The retainer 14 is elastically held in a neutral position where the engagement is released.

  As shown in FIG. 1, an electromagnetic clutch 20 that controls the engagement and disengagement of the two-way clutch 10 is provided between the outer ring 1 and the cage 14 together with the two-way clutch 10. Yes.

  The electromagnetic clutch 20 is separated from the armature 21 disposed opposite to the end face of the retainer 14, the rotor 22 facing the armature 21 in the axial direction, the electromagnet 23 facing the rotor 22 in the axial direction, and the rotor 22. And a separation spring 24 for urging the armature 21 in the direction to be moved.

  As shown in FIGS. 1 and 3, the armature 21 has an engagement hole 25, and a protrusion 26 formed at the end of the retainer 14 is engaged with the engagement hole 25. With the engagement hole 25 being engaged, the armature 21 is prevented from rotating with respect to the retainer 14 and is movable in the axial direction.

  The rotor 22 is press-fitted into an end portion of a rotor guide 27 made of a non-magnetic material connected to the opening end portion of the outer ring 1 and rotates together with the rotor guide 27. A plurality of arc-shaped slits 28 are formed in the rotor 22 at intervals in the circumferential direction, and permanent magnets 29 for attracting the armature 21 toward the rotor 22 are incorporated in the respective slits 28.

  Here, as the permanent magnet 29, the attractive force when the armature 21 is separated from the rotor 22 is weaker than the elastic force of the separation spring 24, and the attractive force when the armature 21 is attracted to the rotor 22 is the separation spring 24. However, there may be a case where the suction force when the armature 21 is separated from the rotor 22 is stronger than the elastic force of the separation spring 24.

  An annular recess 30 is formed on the outer peripheral portion of the suction surface of the rotor 22 facing the armature 21, and the separation spring 24 is incorporated in the recess 30.

  The electromagnet 23 includes an electromagnetic coil 23a and a core 23b that supports the electromagnetic coil 23a. When the electromagnetic coil 23a is energized, a magnetic flux flows through the core 23b, the rotor 22, and the armature 21, and an attractive force is applied to the armature 21. It has come to be.

  The rotation transmission device shown in the embodiment has the above-described structure. As shown in FIG. 3, the magnetic flux 40 generated from the permanent magnet 29 flows between the rotor 22 and the armature 21, and an attractive force is applied to the armature 21. However, the armature 21 is not attracted to the rotor 22, and an air gap is formed between the armature 21 and the rotor 22.

  FIG. 3 shows a disengaged state of the two-way clutch 10, and even if the inner ring 2 rotates, the rotation is not transmitted to the outer ring 1, and the inner ring 2 rotates freely.

  When the electromagnetic coil 23a of the electromagnet 23 is energized while the inner ring 2 is rotating, magnetic flux flows between the core 23b, the rotor 22 and the armature 21. At this time, the flow of magnetic flux generated by the electromagnetic coil 23 a is in the same direction as the magnetic flux 40 generated by the permanent magnet 29, and the armature 21 is attracted to the rotor 22 by the magnetic flux generated by the electromagnetic coil 23 a.

  Since the frictional resistance acting on the suction surface by the armature 21 becomes the rotational resistance of the cage 14, the inner ring 2 and the cage 14 rotate relative to each other, and the relative rotation causes the engagement element 13 to move between the cylindrical surface 11 and the cam. By engaging with the surface 12, the two-way clutch 10 is engaged, and the rotation of the inner ring 2 is transmitted to the outer ring 1.

  Here, in the attracted state of the armature 21, the gap between the armature 21 and the permanent magnet 29 becomes small, and the attractive force of the permanent magnet 29 becomes stronger than the elastic force of the separation spring 24. Even so, the armature 21 is held in an adsorbed state. For this reason, it consumes less electric energy and is extremely economical.

  When releasing the engagement of the two-way clutch 10, the energization of the electromagnetic coil 23 a causes the armature 21 to generate a magnetic flux opposite to the magnetic flux generated by the permanent magnet 29, thereby weakening the attractive force applied to the armature 21. The armature 21 is separated from the rotor 22 by the pressing force of the separation spring 24.

  As a result, the retainer 14 rotates due to the restoring elasticity of the switch spring 15, and the engagement element 13 is returned to the neutral position where the engagement with the cylindrical surface 11 and the cam surface 12 is released. Rotational transmission is interrupted.

  In the rotation transmission device in which the attractive force in the state where the armature 21 is separated from the rotor 22 is stronger than the elastic force of the separation spring 24 as the permanent magnet 29, the armature 21 is caused by the attractive force of the permanent magnet 29. Since the two-way clutch 10 is immediately engaged when the inner ring 2 rotates because the inner ring 2 rotates, rotation is transmitted from the inner ring 2 to the outer ring 1.

  As shown in the embodiment, by forming an annular recess 30 in the outer peripheral portion of the armature suction surface of the rotor 22 and incorporating a separation spring 24 into the recess 30, the armature 21 has a thin thickness with a uniform axial thickness. The rotation transmission device can be reduced in weight.

  Further, since the annular recess 30 is formed in the outer peripheral portion of the armature attracting surface of the rotor 22, there is no inconvenience that the separation spring obstructs the magnetic path between the armature 21 and the rotor 22 and decreases the magnetic efficiency. The electromagnet 23 can be small.

  In the embodiment, the rotation transmission device in which the permanent magnet 29 is incorporated in the slit 28 formed in the rotor 22 is shown, but the rotation transmission device is not limited to this. For example, a rotation transmission device in which the permanent magnet 29 is omitted, such as the rotation transmission device described in Patent Document 1 described above, may be used.

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. Sectional view showing the electromagnetic clutch part of FIG.

Explanation of symbols

1 outer ring 2 inner ring 10 two-way clutch 11 cylindrical surface 12 cam surface 13 engagement element 14 retainer 15 switch spring 20 electromagnetic clutch 21 armature 22 rotor 23 electromagnet 24 separation spring 30 recess

Claims (1)

Between the outer ring and the inner ring incorporated in the inner ring, there is an engagement element and a cage for holding the engagement element, and the engagement element is engaged with the opposing surfaces of the outer ring and the inner ring by controlling the rotation of the retainer. A two-way clutch for coupling the outer ring and the inner ring is incorporated, and an electromagnetic clutch for controlling the coupling and decoupling of the two-way clutch is provided in addition to the two-way clutch, and the electromagnetic clutch is attached to the cage. An armature that is prevented from rotating and is supported so as to be movable in the axial direction, a rotor that is connected to the outer ring and faces the armature in the axial direction, faces the rotor in the axial direction, and moves the armature in the axial direction when energized. In a rotation transmission device comprising an electromagnet and a separation spring that biases the armature in a direction in which the armature is separated from the rotor,
A rotation transmission device, wherein an annular recess is formed in an outer peripheral portion of the armature suction surface of the rotor, and the separation spring is incorporated in the recess.

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