JP2008196653A - Rotation transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation transmission device that is structured such that mis-engagement of a two-way clutch can be prevented, and leakage of magnetic flux can be reduced in an engagement state of an armature. <P>SOLUTION: An electromagnetic clutch 20 is arranged in addition to the two-way clutch 10. The electromagnetic clutch 20 is formed with the armature 21, a rotor 22, and an electromagnet 23 attracting the armature 21 to the rotor 22 by carrying a current thereto. A mis-engagement prevention ring 27 is fixed to an inside-diameter part of the armature 21; a claw 29 is formed in an inner periphery of the armature 21; a cutout part 30 is formed on an end surface of an inner ring 2; and mis-engagement of the two-way clutch 10 is prevented by rotating a cage 14 with the inner ring 2 by fitting the claw 29 to the cutout part 30 in free rotation of the inner ring 2. By forming the mis-engagement prevention ring 27 with a non-magnetic material, leakage of magnetic flux from the inside-diameter part of the armature 21 is reduced in attracting the armature 21. <P>COPYRIGHT: (C)2008,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 that transmits and interrupts driving force to a front wheel as an auxiliary drive wheel has been conventionally known.

  In the rotation transmission device described in Patent Document 1, a two-way clutch is incorporated between a large-diameter portion formed on the input-side member and an outer ring provided on the outside thereof, and an electromagnetic clutch attached to the two-way clutch is used. By controlling the engagement and disengagement of the two-way clutch, the input side member and the outer ring are coupled by the engagement of the two-way clutch, and rotational torque is transmitted between the input side member and the outer ring. Yes.

  Here, the two-way clutch forms a cylindrical surface on the inner periphery of the outer ring, and forms a wedge-shaped space in which both ends in the circumferential direction are narrow between the cylindrical surface and the outer periphery of the large-diameter portion of the input side member. A cam surface is provided, and an engaging element made of a roller is incorporated between the cam surface and the cylindrical surface, and the engaging element is engaged with the cylindrical surface and the cam surface by the relative rotation of the cage that holds the engaging element and the input side member. I try to let them. Further, a switch spring is incorporated between the input side member 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 is supported so as to be movable in the axial direction, and a rotor that is incorporated in a rotor guide connected to the opening end of the 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. The armature is attached to the outer ring by attracting the armature to the rotor by energizing the electromagnet. The input member is engaged with the cylindrical surface and the cam surface by relative rotation of the input side member.

JP 2005-249003 A

  By the way, in the rotation transmission device described in Patent Document 1, at the time of free rotation in which only the input side member rotates at a high speed, both the input side member and the roller held by the cage rotate and act on the roller. The roller moves radially outward due to centrifugal force and contacts the cylindrical surface of the outer ring, and the dragging torque acting on the contact portion causes the input side member and the cage to rotate relative to each other so that the roller moves to the cam surface and cylindrical surface. There is a risk of misengaging.

  In addition, when the input side member is suddenly accelerated and decelerated in a free-rotating state, the input side member is caused by the inertial force of the cage, armature, and roller that are elastically coupled to the input side member via the switch spring. There is a possibility that the member and the cage, the armature, and the roller rotate relative to each other and the roller may be misengaged with the cam surface and the cylindrical surface.

  Further, when the armature is in an adsorbing state where the armature is in close contact with the rotor, magnetic flux may leak from the inner diameter portion of the armature, and the armature may not be reliably adsorbed and held.

  An object of the present invention is to provide a rotation transmission device that can prevent misengagement of a two-way clutch and reduce leakage of magnetic flux in an engaged state of an armature.

  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 engaging the joint with the outer ring and the inner ring is incorporated, and the engagement element is engaged with the outer ring and the inner ring between the retainer of the two-way clutch and the inner ring. A switch spring that elastically holds the cage is incorporated at a neutral position where the release is released, and an electromagnetic clutch that controls the coupling and release of the two-way clutch is provided in addition to the two-way clutch. A disk-shaped armature having a hole in the center that is supported with respect to the cage and is movable in the axial direction, and a rotor guide connected to the open end of the outer ring. In a rotation transmission device comprising a rotor that faces the armature in the axial direction, an electromagnet that faces the rotor in the axial direction, and attracts the armature to the rotor by energization, and a separation spring that biases the armature in a direction away from the rotor. A misengagement prevention ring made of a non-magnetic material is fixed to the inner diameter portion of the armature, and a plurality of notches are formed on the inner circumference of the misengagement prevention ring on the end face of the inner ring in a separated state away from the rotor. A configuration is adopted in which a plurality of claws are provided that fit into each of the parts and come out of the notch in an adsorbing state where the armature is in close contact with the rotor.

  As described above, a plurality of claws are provided on the inner periphery of the misengagement prevention ring fixed to the inner diameter surface of the armature, and a notch portion is formed on the end surface of the inner ring so as to face each of the claws, and the armature is separated from the rotor. Since each claw is engaged with the notch in the separated state, the inner ring rotates between the claw and the notch due to the engagement between the claw and the notch during free rotation of the inner ring where the two-way clutch is disengaged. It is transmitted from the joint portion to the armature through the mis-engagement prevention ring, and transmitted from the armature to the retainer that is prevented from rotating around the armature, so that the retainer rotates together with the inner ring. For this reason, the inner ring and the cage do not rotate relative to each other, and it is possible to prevent the two-way clutch from being misengaged during free rotation of the inner ring.

  Further, when the armature is attracted to the rotor by energizing the electromagnet, the claw is pulled out from the notch, so that the cage and the inner ring can be relatively rotated, and the two-way clutch can be reliably engaged.

  Furthermore, by forming the mis-engagement prevention ring with a non-magnetic material, it is possible to prevent magnetic flux from leaking from the inner diameter of the armature in the attracted state where the armature is attracted to the rotor, and the reliability of attracting and holding Can increase the sex.

  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.

  An input shaft 4 is inserted inside the inner ring 2, the input shaft 4 and the inner ring 2 are prevented from rotating by a serration 5, and the input shaft 4 and the inner ring 2 rotate together.

  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 3, 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.

  In addition, a switch spring 15 partially cut off in the circumferential direction is incorporated in the end portion of the inner ring 2, and a pair of pressing pieces 15 a formed outward from both ends of the switch spring 15 are formed on the end surface of the inner ring 2. It inserts into the notch 17 provided in the edge part of the holder | retainer 14 from the notch part 16, presses the opposing side surface in the circumferential direction of the notch part 16 and the notch 17 in the opposite direction, and the engagement element 13 is pressed by the pressing. Holds the retainer 14 in a neutral position where the engagement is released from the cylindrical surface 11 and the cam surface 12.

  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 a disk-shaped armature 21 having a hole in the center disposed opposite to the end face of the cage 14, a rotor 22 facing the armature 21 in the axial direction, and facing the rotor 22 in the axial direction. An electromagnet 23 and a separation spring 24 that urges the armature 21 in a direction away from the rotor 22 are provided.

  As shown in FIGS. 4 and 5, 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, The armature 21 is prevented from rotating with respect to the retainer 14 by the engagement of the engagement hole 25 and is movable in the axial direction.

  As shown in FIGS. 2 and 5, a misengagement prevention ring 27 is fixed to the inner diameter portion of the armature 21 through means such as adhesion. The mis-engagement prevention ring 27 is made of a non-magnetic material, and the thickness thereof is thinner than the thickness of the armature 21, and one side surface thereof forms the same surface as one side surface of the armature 21, and the same surface faces the end surface of the cage 14. It is supposed to be built-in.

  Further, by fixing the misengagement prevention ring 27 so that one side surface thereof is flush with the one side surface of the armature 21, a concave step portion 28 is formed on the inner diameter side of the surface of the armature 21 that faces the rotor 22. The separation spring 24 is incorporated in the concave step portion 28.

  As described above, the concave step for incorporating the separation spring into the armature 21 is formed by forming the concave step portion 28 that allows the separation spring 24 to be incorporated on the inner diameter side of the armature 21 by fixing the misengagement prevention ring 27. Since the formation of the portion can be made unnecessary, the armature 21 can be easily processed, and the cost can be reduced.

  A plurality of claws 29 are formed on the inner diameter surface of the mis-engagement preventing ring 27 at intervals in the circumferential direction, while the end surface of the inner ring 2 is provided with a notch 30 facing each of the claws 29. Yes. The claw 29 is fitted into the notch 30 in a separated state in which the armature 21 is separated from the rotor 22, and is pulled out from the notch 30 in an adsorbing state where the armature 21 is in close contact with the rotor 22.

  The rotor 22 is connected to the outer ring 1 via a rotor guide 31. As shown in FIG. 2, one end of the rotor guide 31 is fitted to the outer periphery of the opening end of the outer ring 1, and the inner periphery of the rotor guide 31 corresponds to the end surface of the cylindrical portion 1 a provided continuously to the opening end of the outer ring 1. An annular bulging portion 32 that restricts the fitting amount of the rotor guide 31 by contact is formed.

  The rotor guide 31 is formed with a plurality of anti-rotation pieces 33 on the surface of the annular bulging portion 32 facing the outer ring 1, and notches provided on the opening end surfaces of the anti-rotation pieces 33 and the cylindrical portion 1 a. The rotor guide 31 is prevented from rotating with respect to the outer ring 1 by the fitting of the portion 34.

  A circumferential groove 35 is formed on the inner diameter surface of the cylindrical portion 1 a so as to cross the notch 34, while a retaining groove 36 continuous with the circumferential groove 35 is provided on the inner diameter surface of the rotation stopper piece 33. The rotor guide 31 is not separated from the outer ring 1 in the axial direction by a retaining ring 37 attached so as to straddle the retaining groove 36 and the circumferential groove 35.

  As shown in FIG. 1, the rotor 22 has cylindrical portions 22a and 22b on the outer periphery and inner periphery, and the outer peripheral cylindrical portion 22a is fitted into the other end of the rotor guide 31, and the open end of the outer peripheral cylindrical portion 22a. The rotor 22 is prevented from rotating with respect to the rotor guide 31 by the engagement of the outward projecting piece 38 formed on the notch 39 and the notch 39 formed at the other end of the rotor guide 31.

  Further, the rotor 22 is prevented from coming out of the other end of the rotor guide 27 by a retaining ring 40 attached in the other end portion of the rotor guide 31.

  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. FIGS. 1 and 2 show a cut-off state of the electromagnet 23 with respect to the electromagnetic coil 23a, and the armature 21 is separated from the rotor 22 and An air gap is formed between the two. The two-way clutch 10 is in a disengaged state. For this reason, 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 23 a of the electromagnet 23 is energized in the free rotation state of the inner ring 2, magnetic flux flows between the core 23 b, the rotor 22, and the armature 21, and the armature 21 is attracted to the rotor 22.

  As the armature 21 is attracted, the frictional resistance acting on the attracting surface becomes the rotational resistance of the cage 14, so that the inner ring 2 and the cage 14 rotate relative to each other. By the relative rotation, the engaging element 13 is engaged with the cylindrical surface 11 and the cam surface 12, the two-way clutch 10 is engaged, and the rotation of the inner ring 2 is transmitted to the outer ring 1. Further, the switch spring 15 is elastically deformed by the relative rotation of the inner ring 2 and the cage 14.

  For this reason, when the energization to the electromagnetic coil 23a is interrupted, the armature 21 is separated from the rotor 22 by the pressing force of the separation spring 24, and the cage 14 is rotated by the restoring elasticity of the switch spring 15, and the engaging element 13 is cylindrical. Returning to the neutral position where the engagement with the surface 11 and the cam surface 12 is released, the two-way clutch 10 is disengaged, the rotation transmission from the inner ring 2 to the outer ring 1 is interrupted, and the inner ring 2 is free. Rotate.

  In the free rotation state of the inner ring 2, the inner ring 2 and the retainer 14 are elastically connected by the switch spring 15, so that the inner ring 2, the retainer 14 and the engagement element 13 held by the retainer 14 rotate together. To do.

  For this reason, when the inner ring 2 rotates freely, the engaging element 13 moves radially outward by centrifugal force to contact the cylindrical surface 11, and drag torque is generated in the cage 14 by the frictional resistance acting on the contact portion. . This drag torque acts against the elastic holding force of the switch spring 15 and tries to rotate the cage 14 relative to the inner ring 2.

  At this time, the armature 21 is prevented from rotating to the inner ring 2 by fitting the inner peripheral claw 29 of the misengagement prevention ring 27 fixed to the inner diameter part thereof and the notch 30 of the end face of the inner ring 2, and the retainer 14. Since the armature 21 and the armature 21 are prevented from rotating by the engagement of the projecting piece 26 with respect to the engagement hole 25, the cage 14 does not rotate relative to the inner ring 2, and the two-way clutch when the inner ring 2 rotates freely. 10 is not misengaged.

  Here, when the armature 21 is attracted to the rotor 22 by energizing the electromagnetic coil 23a, the claw 29 provided on the inner peripheral surface of the misengagement prevention ring 27 is pulled out from the notch 30, so that the cage 14 and the inner ring 2 The relative rotation can be enabled, and as a result, the two-way clutch 10 can be reliably engaged.

  Further, since the mis-engagement prevention ring 27 is formed of a non-magnetic material, it is possible to reduce the leakage of magnetic flux from the inner diameter portion of the armature 21 when the armature 21 is attracted to the rotor 22. The armature 21 can be held in an attracted state by the small electromagnet 23 having a small capacity.

Longitudinal front view showing an embodiment of a rotation transmission device according to the present invention Enlarged cross-sectional view showing outer ring, rotor guide and rotor connection Sectional view along line III-III in FIG. Sectional view along line IV-IV in FIG. Exploded perspective view showing inner ring, cage and armature

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 10 Two-way clutch 11 Cylindrical surface 12 Cam surface 13 Encoder 14 Cage 15 Switch spring 20 Electromagnetic clutch 21 Armature 22 Rotor 23 Electromagnet 27 Misengagement prevention ring 29 Claw 30 Notch

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 the retainer is elastically held at a neutral position where the engagement between the retainer and the inner ring of the two-way clutch is released from the outer ring and the inner ring. A switch spring is incorporated, and an electromagnetic clutch for controlling the coupling and decoupling of the two-way clutch is provided along with the two-way clutch, and the electromagnetic clutch is prevented from rotating with respect to the cage and is axially A disc-shaped armature having a hole in the center supported in a movable manner, a rotor incorporated in a rotor guide connected to the opening end of the outer ring and facing the armature in the axial direction; and a rotor; Opposite in direction, and an electromagnet for attracting the armature to the rotor by energizing, the rotation transmitting device comprising a separating spring biasing the armature in a direction away from the rotor,
A misengagement prevention ring made of a non-magnetic material is fixed to the inner diameter portion of the armature, and a plurality of notches are formed on the inner circumference of the misengagement prevention ring on the end face of the inner ring in a state of separation from the rotor. A rotation transmission device characterized in that a plurality of claws are provided that fit into each of the parts and come out of the notch in an adsorbing state where the armature is in close contact with the rotor.

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