JP4732200B2 - Rotation transmission device - Google Patents

Description

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

  As this type of rotation transmission device, one described in Patent Document 1 has been conventionally known. In this rotation transmission device, an outer member as an output member is provided outside an inner member as an input member, a two-way clutch is incorporated between the inner member and the outer member, and the two-way clutch is turned on. , OFF is controlled by an electromagnetic clutch.

  Here, the two-way clutch is provided with a cam surface that forms a wedge-shaped space between the outer surface of the inner member and the cylindrical surface formed on the inner periphery of the outer member, and between the cam surface and the cylindrical surface. The roller built in is held by a cage assembled between the inner member and the outer member, and the spring force of the switch spring is applied to the cage so that the roller engages with the cam surface and the cylindrical surface. The cage is elastically held in the neutral position to be released.

  The electromagnetic clutch, on the other hand, holds the armature that is prevented from rotating with respect to the cage by being energized to the electromagnetic coil of the electromagnet and that is supported so as to be movable in the axial direction to the rotor that is prevented from rotating around the outer member. The vessel is coupled to the outer member.

  In the rotation transmission device configured as described above, when the armature is attracted to the rotor by energizing the electromagnetic coil of the electromagnet, the cage rotates relative to the inner member by the frictional resistance acting on the attracting surface, and the roller is a cylindrical surface. The rotation of the inner member is transmitted to the outer member via the roller by engaging with the cam surface.

  When energization of the electromagnetic coil of the electromagnet is released, the cage is returned to the neutral position by the spring force of the switch spring, the engagement of the roller with the cylindrical surface and the cam surface is released, and the inner member is idled.

  By the way, in the conventional rotation transmission device, at the time of idling in which only the inner member rotates at a high speed, the inner member and the roller held by the cage rotate together, and the roller is radiused by the centrifugal force acting on the roller. The outer member and the cage are rotated relative to each other by the drag torque acting on the contact portion by moving outward in the direction, and the roller is misengaged with the cam surface and the cylindrical surface. There is a possibility that there is a point to be improved.

  In addition, when the inner member is idling and accelerated and decelerated suddenly, the inner member and the retainer, the armature and the roller are elastically coupled with the inner member by the inertial force of the retainer, the armature and the roller. May rotate relative to each other and the roller may be misengaged with the cam surface and the cylindrical surface.

In order to eliminate such inconvenience, in the rotation transmission device described in Patent Document 2, the cylindrical portion provided in the armature is fitted to the inside of the switch spring in a state where the electromagnet is cut off, and the switch spring The diameter reduction is prevented and the two-way clutch is prevented from being misengaged.
JP 2003-090356 A Japanese Patent Laying-Open No. 2005-083560

By the way, in the rotation transmission device described in Patent Document 2, since it is necessary to form a cylindrical portion in the armature, there is a problem that costs are increased. Also, the friction surface of the armature usually has a special grinding process on the surface to increase the frictional resistance. In order to perform this process, the armature needs to be a flat plate. Since the armature having a portion cannot be processed and the surface roughness of the friction surface cannot be secured, the frictional resistance is reduced and slippage occurs on the contact surface between the rotor and the armature, and the two-way clutch can be engaged. There was a possibility that it could not be done.

  An object of the present invention is to provide a highly reliable rotation transmission device capable of preventing misengagement of a two-way clutch and ensuring a predetermined surface roughness on a friction surface of an armature. .

In order to solve the above-described problems, in the present invention, two directions for transmitting and blocking rotational torque between an input side member and an output side member provided outside the input member are provided. A clutch and an electromagnetic clutch for controlling engagement and disengagement of the two-way clutch are incorporated, and the two-way clutch is held between the input side member and the output side member, and held by the cage An engagement member that engages between opposing surfaces of the input side member and the output side member by relative rotation of the cage with respect to the input side member, and elastically deforms by relative rotation of the cage with respect to the input side member. A switch spring for returning and rotating the retainer to a neutral position where the engagement element is disengaged by its restoring elasticity, and the electromagnetic clutch slides on a small diameter shaft portion formed at an end portion of the input side member. Armature that is fitted to the retainer and is prevented from rotating with respect to the cage, a rotor that is prevented from being rotated by the output side member and that is opposed to the armature in the axial direction, and that is opposed to the rotor in the axial direction and is electrically energized to the rotor. In a rotation transmission device comprising an electromagnet that adsorbs the armature and a separation spring that presses the armature in a direction away from the rotor, an engagement groove is formed in the small-diameter shaft portion of the input side member, and the engagement groove extends from the end surface of the shaft portion. An axial groove is formed, a retaining ring for limiting the armature separation amount is fitted into the engaging groove, and an engagement piece formed on the inner periphery of the retaining ring is engaged with the axial groove. prevented from rotating the retaining ring Te, the outer periphery of the retaining ring, only separated state the armature abuts against the retaining ring, rotating the fitted to the notch formed in the radially inner surface of the armature, to detent the armature It was adopted a structure in which a locking piece.

  As described above, the stopper ring is provided on the retaining ring that limits the amount of separation of the armature, and the armature is formed with a notch that fits the stopper piece in the separated state in contact with the retaining ring. Since the rotation-preventing piece fits into the notch and prevents the armature from rotating in the idling state of the member, the input-side member and the cage do not rotate relative to each other. Engagement can be prevented.

  Further, since the armature can be a flat plate, it is possible to perform a special grinding process for increasing the frictional resistance on the friction surface attracted by the rotor, and to ensure a predetermined surface roughness on the friction surface. it can. Therefore, there is no inconvenience of slippage between the rotor and the armature attracting surface attracted to the rotor when the electromagnet is energized, and the two-way clutch can be reliably switched to the engaged state. A high rotation transmission device can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, an input shaft 2 as an input side member is incorporated in a housing 1 having a closed end. The input shaft 2 has a cam ring 3 at the center in the axial direction, and a pair of small diameter shaft portions 4 and 5 are provided at both ends of the cam ring 3.

  An outer ring 6 as an output side member is provided outside the input shaft 2, and the outer ring 6 and the input shaft 2 are supported through a bearing 7 so as to be relatively rotatable. The outer ring 6 is rotatably supported through a bearing 8 incorporated in the housing 1.

  A two-way clutch 10 is provided between the input shaft 2 and the outer ring 6, and an electromagnetic clutch 20 that controls engagement and disengagement of the two-way clutch 10 is provided in parallel with the two-way clutch 10.

  As shown in FIG. 4, the two-way clutch 10 forms a cylindrical surface 11 on the inner periphery of the outer ring 6, and a plurality of cam surfaces that form a wedge-shaped space with the cylindrical surface 11 on the outer periphery of the cam ring 3. 12 are provided at intervals in the circumferential direction, and a roller 13 as an engaging member is incorporated between each cam surface 12 and the cylindrical surface 11, and the roller 13 is held by a cage 14 incorporated between the input shaft 2 and the outer ring 6. It consists of a two-way roller clutch.

  Between the input shaft 2 and the cage 14, a switch spring 15 is incorporated which elastically holds the cage 14 in a neutral position where the roller 13 is disengaged from the cylindrical surface 11 and the cam surface 12.

  The switch spring 15 has a configuration in which a pair of pressing pieces 15b are formed outward at both ends of the C-shaped ring portion 15a.

  As shown in FIGS. 2 and 4, the switch spring 15 is assembled so that the ring portion 15 a is fitted into a spring housing recess 16 formed on the end surface of the cam ring 3, and the pair of pressing pieces 15 b are spring housing recesses. 16 is inserted into a notch 18 provided in the end face of the retainer 14 from a notch 17 formed in the peripheral wall, and the opposite end faces in the circumferential direction of the notch 17 and the notch 18 are pressed in opposite directions. The roller 13 is held in the neutral position by the pressing.

  As shown in FIG. 1, the electromagnetic clutch 20 is slidably fitted to the small-diameter shaft portion 5 of the input shaft 2 and faces the end surface of the cage 14 in the axial direction, and the armature 21 in the axial direction. The rotor 22 is opposed, the electromagnet 23 is opposed to the rotor 22 in the axial direction, and the separation spring 24 is pressed in a direction in which the armature 21 is separated from the rotor 22.

  As shown in FIG. 2, an engagement hole 25 is formed in the armature 21, and a projecting piece 26 provided on the end surface of the retainer 14 is inserted into the engagement hole 25, and the projecting piece 26 and the engagement hole 25 are inserted. As a result of the engagement, the armature 21 is prevented from rotating with respect to the retainer 14 and is movable in the axial direction.

  As shown in FIG. 1, the rotor 22 has cylindrical portions 22 a and 22 b on the inner periphery and the outer periphery, and the outer cylindrical portion 22 b is installed in the opening end portion of the outer ring 6 and is formed in a rotor guide 27 made of a nonmagnetic material. The outer ring 6 is prevented from being rotated.

  The electromagnet 23 includes a field core 23a and an electromagnetic coil 23b supported by the field core 23a. The electromagnet 23 is disposed between the outer cylindrical portions 22 a and 22 b of the rotor 22, and the field core 23 a is supported on the closed end of the housing 1 in a non-rotating manner.

  As shown in FIGS. 2 and 6, the small diameter shaft portion 5 of the input shaft 2 is formed with an engagement groove 30 and an axial groove 31 extending from the end surface of the small diameter shaft portion 5 to the engagement groove 30. A retaining ring 32 that restricts the amount of separation of the armature 21 is fitted in the engaging groove 30.

  An engagement piece 33 is provided on the inner periphery of the retaining ring 32, and the engagement piece 33 is engaged with the axial groove 31 provided in the small diameter shaft portion 5, and the retaining ring 32 is prevented from rotating by the engagement. Has been.

  In addition, a pair of anti-rotation pieces 34 are formed at the outer peripheral position of the retaining ring 32 toward the armature 21, and each anti-rotation piece 34 is against a pair of notches 35 formed on the inner diameter surface of the armature 21. It can be fitted.

  The anti-rotation piece 34 is fitted into the notch 35 when the armature 21 is separated to a position where it comes into contact with the retaining ring 32, and the armature 21 is prevented from rotating by the fitting. The armature 21 is released from the notch 35 while being attracted to the armature 21 and the armature 21 is unlocked.

  The rotation transmission device shown in the embodiment has the above-described structure, and the roller 13 is held in a neutral state by the spring force of the switch spring 15 when the energization of the electromagnet 23 to the electromagnetic coil 23b is interrupted. The rotation is not transmitted to the outer ring 6 and the input shaft 2 rotates idle.

  When the electromagnetic coil 23b of the electromagnet 23 is energized in the rotation state of the input shaft 2, an attractive force is applied to the armature 21, and the armature 21 moves against the elasticity of the separation spring 24, as shown in FIG. While being attracted to the rotor 22, the engagement between the rotation stopper piece 34 and the notch 35 is released.

  The frictional resistance acting on the attracting surfaces of the rotor 22 and the armature 21 becomes the rotational resistance of the cage 14, and the frictional resistance is set to a value larger than the spring force of the switch spring 15, so that the switch spring 15 is elastically deformed. As a result, the input shaft 2 and the cage 14 rotate relative to each other. By the relative rotation, the roller 13 is pushed into the narrow portion of the wedge-shaped space and engaged with the cylindrical surface 11 and the cam surface 12, and the rotation of the input shaft 2 is transmitted to the outer ring 6 through the roller 13.

  In the state of torque transmission from the input shaft 2 to the outer ring 6, when the energization to the electromagnetic coil 23 b is cut off, the armature 21 is separated from the rotor 22 by the pressing of the separation spring 24, and as shown in FIG. Move to the abutting position. At this time, the anti-rotation piece 34 provided on the retaining ring 32 fits into the notch 35 to prevent the armature 21 from rotating.

  When the armature 21 is separated from the rotor 22, the retainer 14 is rotated in the reverse direction when engaged with the input shaft 2 by the spring force of the switch spring 15, and the roller 13 is engaged with the cylindrical surface 11 and the cam surface 12. It is released and returned to the neutral position. For this reason, rotation transmission from the input shaft 2 to the outer ring 6 is interrupted.

  In the idling state of the input shaft 2, the input shaft 2 and the cage 14 are elastically connected by the switch spring 15, so that the input shaft 2, the cage 14, and the roller 13 held by the cage 14 are both Rotate.

  For this reason, when the input shaft 2 idles, the roller 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 input shaft 2.

  At this time, the armature 21 is prevented from rotating by the fitting of the notch 35 formed on the inner diameter surface of the armature 21 and the rotation stopper 34 provided on the retaining ring 32, and the retainer 14 and the armature 21 are engaged with the engagement hole 25. Since the rotation is prevented by the engagement of the projecting piece 26, the cage 14 does not rotate relative to the input shaft 2, and the two-way clutch 10 is misengaged when the input shaft 2 is idling. There is no occurrence.

  Further, since the armature 21 is prevented from being rotated by the fitting of the notch 35 formed on the inner diameter surface of the armature 21 with the rotation stopper 34 provided on the retaining ring 32, the armature 21 can be a flat plate.

  For this reason, it is possible to perform a special grinding process for increasing the frictional resistance on the friction surface adsorbed by the rotor 22 of the armature 21, and to ensure a predetermined surface roughness on the friction surface. Therefore, there is no inconvenience of slippage between the rotor 22 and the attracting surface of the armature 21 attracted to the rotor 22 when the electromagnet 23 is energized, and the two-way clutch 10 can be reliably switched to the engaged state. A highly reliable rotation transmission device can be obtained.

A longitudinal front view showing an embodiment of a rotation transmission device according to the present invention Sectional drawing which expands and shows the installation part of the armature of FIG. Sectional view along line III-III in FIG. Sectional view along line IV-IV in FIG. Sectional view showing armature adsorption state Exploded perspective view showing input shaft, armature and retaining ring

Explanation of symbols

2 Input shaft (input side member)
5 Small diameter shaft part 6 Outer ring (output side member)
10 Two-way clutch 13 Roller (engagement element)
14 Cage 15 Switch spring 20 Electromagnetic clutch 21 Armature 22 Rotor 23 Electromagnet 32 Retaining ring 34 Non-rotating piece 35 Notch

Claims (1)

A two-way clutch that transmits and shuts off rotational torque between the input side member and an output side member provided outside the input side member, and engagement and disengagement of the two-way clutch An electromagnetic clutch that controls the two-way clutch, the cage incorporated between the input-side member and the output-side member, and the cage is held by the cage and is input by relative rotation of the cage with respect to the input-side member. An engaging member that is engaged between the opposing surfaces of the side member and the output side member to couple the two members, and a neutral member that is elastically deformed by the relative rotation of the cage with respect to the input side member, and the engaging member is disengaged by its restoring elasticity. The electromagnetic clutch is slidably fitted to a small-diameter shaft portion formed at the end of the input side member and is prevented from rotating with respect to the cage. A A rotor that is prevented from rotating by the output side member and faces the armature in the axial direction, an electromagnet that faces the rotor in the axial direction and attracts the armature to the rotor when energized, and presses the armature in a direction away from the rotor A rotation transmission device comprising a separating spring that
An engaging groove and an axial groove extending from the shaft end surface to the engaging groove are formed in the small-diameter shaft portion of the input side member, and a retaining ring for limiting the separation amount of the armature is fitted in the engaging groove. Then , the engaging piece formed on the inner periphery of the retaining ring is engaged with the axial groove to prevent the retaining ring from rotating, and only in a separated state where the armature contacts the retaining ring on the outer periphery of the retaining ring. A rotation transmission device, characterized in that a rotation-stopping piece for locking the armature is provided by fitting into a notch formed on the inner diameter surface of the armature.

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