JP2008039133A - Rotation transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of part items of a rotation transmitting device in which a two-way clutch is incorporated between an outer ring and a cam ring incorporated thereinside, with an electromagnetic clutch controlling the engagement and disengagement of the two-way clutch. <P>SOLUTION: The two-way clutch 20 is incorporated between the outer ring 7 and the cam ring 5 incorporated thereinside. The electromagnetic clutch 40 for controlling the engagement and disengagement of the two-way clutch 20 is provided adjacent to the two-way clutch 20. The two-way clutch 20 is a roller clutch in which a roller 23 is incorporated between a cylindrical surface 21 formed on the inner periphery of the outer ring 7 and a plurality of cam surfaces 22 formed on the outer periphery of the cam ring 5, with the roller 23 held by a cage 24. The cam ring 5 is provided with: a first radial bearing surface 26 for supporting the inside diameter surface of a flange 27 provided at one end of the cage 24; and a second radial bearing surface 30 for supporting the inner peripheral surface of the other end of the cage 24. The cage 24 is rotatably supported by the cam ring 5 alone so as to reduce the number of part items. <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, as a rotation transmission device that transmits and blocks driving force to a front wheel as an auxiliary drive wheel, for example, as described in Patent Document 1, it is incorporated in an outer ring and the inside thereof. A two-way clutch is incorporated between the cam ring portions of the input shaft, and the engagement and release of the two-way clutch are controlled by an electromagnetic clutch provided along with the two-way clutch, and the outer ring and the input shaft are connected by the engagement of the two-way clutch. 2. Description of the Related Art Conventionally, a cam ring portion is connected to transmit rotational torque between an outer ring and an input shaft.

  Here, the two-way clutch forms a cylindrical surface on the inner periphery of the outer ring, and a cam surface on the outer periphery of the cam ring portion of the input shaft that forms a wedge-shaped space whose both ends in the circumferential direction are narrow with the cylindrical surface. A roller is incorporated between the cam surface and the cylindrical surface, and the roller is engaged with the cylindrical surface and the cam surface by relative rotation of the cage for holding the roller and the cam ring portion of the input shaft. Further, a switch spring is incorporated between the cam ring portion of the input shaft and the cage, and the cage is elastically held by the switch spring in a neutral position where the roller is disengaged from the cylindrical surface and the cam surface. .

  On the other hand, the electromagnetic clutch is opposed to the rotor that is prevented from rotating by the outer ring and the armature that is supported by the cage and is supported so as to be movable in the axial direction, and a permanent magnet is incorporated in a slit formed in the rotor. The armature is attracted to the rotor by the magnetic attraction force of the permanent magnet, and the roller is engaged with the cylindrical surface and the cam surface by the relative rotation of the armature coupled to the outer ring and the cam ring part of the input shaft, thereby rotating the input shaft. I am trying to tell you.

  In addition, an electromagnet is opposed to the rotor and energization of the electromagnet generates a magnetic flux that cancels the magnetic flux generated by the permanent magnet to release the armature and release the two-way clutch to free the input shaft. I try to rotate it.

JP 11-336799 A

  By the way, in the rotation transmission device described in Patent Document 1, a circular plate is fitted to both ends of the cam ring portion of the input shaft in the axial direction, and the cage is rotatably supported by the two plates. Because of the configuration, there are many inconveniences such as a large number of parts, time and labor for assembly, and high cost.

  An object of the present invention is to provide a rotation transmission device in which a two-way clutch is incorporated between an outer ring and a cam ring incorporated therein, and the engagement and disengagement of the two-way clutch are controlled by an electromagnetic clutch. This is to reduce the number of parts.

  In order to solve the above-described problem, in the present invention, a two-way clutch for coupling and releasing the outer ring and the cam ring is incorporated between the outer ring and the cam ring incorporated therein, and the engagement of the two-way clutch and An electromagnetic clutch for controlling the disengagement is provided in the two-way clutch. The two-way clutch forms a cylindrical surface on the inner periphery of the outer ring, and both ends in the circumferential direction are narrower between the outer periphery of the cam ring and the cylindrical surface. A rotation comprising a plurality of cam surfaces forming a wedge-shaped space at equal intervals, incorporating rollers between the cam surfaces and the cylindrical surface, and holding the rollers by a cage incorporated between the outer ring and the cam ring. In the transmission device, a first inner surface of a flange formed inward from one end of the cage is rotatably supported on one end of the cam surface formed on the cam ring in an axial direction. The dialkyl bearing surface provided is the employing the configuration to form a second radial bearing surface for rotatably supporting the other end portion inner periphery of the retainer to the other end side in the axial direction of the cam surface.

  Here, the electromagnetic clutch for controlling the engagement and disengagement of the two-way clutch includes an armature that is prevented from rotating by the cage and supported so as to be movable in the axial direction, and an armature and shaft that are prevented from rotating by the outer ring. A rotor that is opposed in a direction, an elastic member that presses the armature in a direction away from the rotor, and a permanent member that is incorporated in a slit formed in the rotor and that adsorbs the armature to the rotor against the elasticity of the elastic member It may be composed of a magnet and an electromagnet that faces the rotor in the axial direction and generates a magnetic flux in a direction that cancels out the magnetic flux generated from the permanent magnet when energized. Alternatively, the permanent magnet may be omitted and the electromagnet may be energized. The armature may be adsorbed by the rotor.

  As described above, the cam ring is provided with the first radial bearing surface and the second radial bearing surface, and the cage is rotatably supported by the two radial bearing surfaces, so that the cage can be rotated only by the cam ring. Therefore, the two plates described in Patent Document 1 can be dispensed with, and the number of components can be reduced.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a bearing 3 is attached to the end plate 2 of the housing 1, and an input shaft 4 is rotatably supported by the bearing 3.

  A cam ring 5 is fitted to an end portion of the input shaft 4 located in the housing 1. The cam ring 5 is prevented from rotating around the input shaft 4 via a serration 6, and an outer ring 7 is provided outside the cam ring 5.

  The outer ring 7 is arranged coaxially with the input shaft 4 and is rotatably supported by a bearing 8 incorporated in the end of the housing 1. The outer ring 7 is supported rotatably relative to the cam ring 5 by a bearing 9 incorporated between the outer ring 7 and the cam ring 5. An output shaft 10 is connected to the outer ring 7.

  Between the cam ring 5 and the outer ring 7, a two-way clutch 20 that couples and releases the cam ring 5 and the outer ring 7 is incorporated.

  As shown in FIG. 1 and FIG. 3 (I), the two-way clutch 20 has a cylindrical surface 21 on the inner periphery of the outer ring 7, and both ends in the circumferential direction between the outer periphery of the cam ring 5 and the cylindrical surface 21. A flat cam surface 22 forming a narrow wedge-shaped space is continuously provided in the circumferential direction, and a roller 23 is incorporated between each cam surface 22 and the cylindrical surface 21, and the roller 23 is formed in the cage 24. It is held by the pocket 25.

  Here, as shown in FIGS. 1 and 4, a first radial bearing surface 26 is formed on the cam ring 5 on one end side in the axial direction of the cam surfaces 22 aligned in the circumferential direction. A flange 27 formed inward from one end of the cage 24 is fitted to the surface 26 and is rotatably supported, and the flange 27 is secured by a retaining ring 28 attached to the radial bearing surface 26.

  Further, the cam ring 5 is formed with a large diameter portion 29 on the other end side in the axial direction of the cam surface 22, and the second radial bearing surface 30 formed on the outer periphery of the large diameter portion 29 is used to The inner periphery of the other end is rotatably supported.

  As shown in FIGS. 1 and 2, a recess 31 is formed on the end surface of the large-diameter portion 29 of the cam ring 5, and a switch spring 33 is incorporated in an annular spring accommodating groove 32 formed on the inner periphery of the recess 31. It is.

  The switch spring 33 has a C shape, and a pair of pressing pieces 33a formed outward from both ends thereof are formed in a notch provided on the other end of the cage 24 from a notch 34 formed on the peripheral wall of the recess 31. The pair of side surfaces that are fitted in the inner surface 35 and are opposed to each other in the circumferential direction of the notch 34 and the notch 35 are pressed in opposite directions, and the roller 23 is engaged with the cylindrical surface 21 and the cam surface 22 by the pressing. The cage 24 is elastically held at the released position.

  As shown in FIG. 1, on the end of the input shaft 4, an electromagnetic clutch 40 that controls the engagement and disengagement of the two-way clutch 20 is provided in addition to the two-way clutch 20. .

  The electromagnetic clutch 40 includes an armature 41 disposed to face the end face of the cage 24, a rotor 42 that faces the armature 41 in the axial direction, and an electromagnet 43 that faces the rotor 42 in the axial direction.

  An engagement hole 44 is formed in the armature 41, and an engagement piece 45 formed at the opening end of the retainer 24 is engaged with the engagement hole 44, and the armature 41 is thereby engaged with the retainer 24 by the engagement. It is prevented from rotating and is movable in the axial direction.

  The rotor 42 is press-fitted into the end portion of a rotor guide 46 made of a non-magnetic material connected to the open end portion of the outer ring 7 and is prevented from rotating around the rotor guide 46. A plurality of arc-shaped slits 47 are formed in the rotor 42 at intervals in the circumferential direction, and a permanent magnet 48 is incorporated in each slit 47.

  Further, an elastic member 49 is incorporated between the opposing surfaces of the armature 41 and the rotor 42, and the elastic member 49 urges the armature 41 in a direction away from the rotor 42, and the elastic force is a magnetic attraction force of the permanent magnet 48. It is getting smaller.

  The electromagnet 43 includes an electromagnetic coil 43a and a core 43b that supports the electromagnetic coil 43a. When the electromagnetic coil 43a is energized, a magnetic flux flows through the core 43b, the rotor 42, and the armature 41, and the direction of the magnetic flux is a permanent magnet. The attracting force applied to the armature 41 from the permanent magnet 48 is made lower than the elastic force of the elastic member 49 in a direction opposite to the magnetic flux generated by the magnetic member 48.

  The rotation transmission device shown in the embodiment has the above-described structure, and FIG. 1 shows a cut-off state of the electromagnet 43 with respect to the electromagnetic coil 43a. The armature 41 is attracted to the rotor 42 by the magnetic attractive force loaded from the permanent magnet 48. The retainer 24 is coupled to the outer ring 7 via the armature 41.

  When the cam ring 5 rotates together with the input shaft 4 in a state where the cage 24 is coupled to the outer ring 7, the cam ring 5 rotates relative to the cage 24, and the roller 23 is cylindrical as shown in FIG. 3 (II). The rotation of the cam ring 5 is transmitted to the outer ring 7 via the roller 23, and the output shaft 10 rotates in the same direction as the input shaft 4.

  Further, when the cam ring 5 rotates relative to the cage 24, the switch spring 33 is elastically deformed.

  When the electromagnetic coil 43a of the electromagnet 43 is energized in the state of rotation transmission from the input shaft 4 to the output shaft 10, magnetic flux flows between the core 43b, the rotor 42, and the armature 41. At this time, since the flow of magnetic flux generated by the electromagnetic coil 43a is opposite to the magnetic flux generated by the permanent magnet 48, the attractive force applied to the armature 41 from the permanent magnet 48 is weakened, and the elastic member 49 The armature 41 is separated from the rotor 42 by the pressing force.

  When the armature 41 is separated from the rotor 42, the retainer 24 is rotated by the restoring elasticity of the switch spring 33, and the roller 23 is engaged with the cylindrical surface 21 and the cam surface 22 as shown in FIG. Returning to the neutral position to be released, the rotation transmission from the cam ring 5 to the outer ring 7 is interrupted, and the input shaft 4 and the cam ring 5 rotate freely.

  As in the rotation transmission device shown in the embodiment, the cam ring 5 is provided with a first radial bearing surface 26 and a second radial bearing surface 30, and is provided at one end of the cage 24 by the first radial bearing surface 26. The inner surface of the flange 27 is rotatably supported, and the inner surface of the other end of the cage 24 is rotatably supported by the second radial bearing surface 30, so that the cage 24 can be rotated only by the cam ring 5. Therefore, the two plates described in Patent Document 1 described above can be made unnecessary, and the number of parts can be reduced.

  In the embodiment, the rotation transmission device in which the armature 41 is attracted to the rotor 42 by the permanent magnet 48 and the attraction is released by energization of the electromagnetic coil 43a is shown, but the permanent magnet 48 is omitted. The rotation transmission device may be configured such that the armature 41 is attracted to the rotor 42 by energization of the electromagnetic coil 43a and the attraction is released by cutting off the energization.

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. (I) is a sectional view showing a part of the two-way clutch shown in FIG. 1, and (II) is a sectional view showing an engaged state of the two-way clutch. Exploded perspective view showing part of cam ring and cage

Explanation of symbols

5 Cam ring 7 Outer ring 20 Two-way clutch 21 Cylindrical surface 22 Cam surface 23 Roller 24 Cage 26 First radial bearing surface 27 Flange 30 Second radial bearing surface 40 Electromagnetic clutch 41 Armature 42 Rotor 43 Electromagnet 48 Permanent magnet 49 Elastic member

Claims (3)

A two-way clutch for connecting and releasing the outer ring and the cam ring is incorporated between the outer ring and the cam ring incorporated inside the outer ring, and the electromagnetic clutch for controlling the engagement and disengagement of the two-way clutch is a two-way clutch. In addition, the two-way clutch forms a cylindrical surface on the inner periphery of the outer ring, and a plurality of cam surfaces that form a narrow wedge-shaped space at both ends in the circumferential direction between the cylindrical surface and the outer periphery of the cam ring, etc. In the rotation transmission device comprising a configuration in which a roller is incorporated between each cam surface and the cylindrical surface, and the roller is held by a cage incorporated between the outer ring and the cam ring.
A first radial bearing surface that rotatably supports an inner diameter surface of a flange formed inward from one end portion of the cage is provided on one axial end portion side of the cam surface formed on the cam ring, A rotation transmission device characterized in that a second radial bearing surface that rotatably supports the inner periphery of the other end of the cage is formed on the other end of the cam surface in the axial direction.   The electromagnetic clutch is prevented from being rotated by the cage and is supported so as to be movable in the axial direction, a rotor which is prevented from being rotated by an outer ring and opposed to the armature in the axial direction, and in a direction away from the rotor. An elastic member that presses the armature, a permanent magnet that is incorporated in a slit formed in the rotor, and that attracts the armature to the rotor against the elasticity of the elastic member, is opposed to the rotor in the axial direction, and is energized The rotation transmission device according to claim 1, comprising an electromagnet that generates a magnetic flux in a direction to cancel the magnetic flux generated from the permanent magnet.   The electromagnetic clutch is prevented by the retainer and supported in an axially movable manner, the rotor is secured by an outer ring and is opposed to the armature in the axial direction, and the rotor faces the rotor in the axial direction. The rotation transmission device according to claim 1, further comprising: an electromagnet that attracts the armature to the rotor by energization; and an elastic member that presses the armature in a direction away from the rotor.

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