JP2008089163A - Rotation transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation transmitting device which is less restricted in applications while reducing the play of a two-way clutch in the rotating direction. <P>SOLUTION: The two-way clutch 10 is incorporated between an outer ring 3 and an inner ring 4, and an electromagnetic clutch 30 is provided in conjunction with the two-way clutch 10 for controlling the engagement/disengagement of the two-way clutch. The two-way clutch 10 has two rollers, namely, a positive rotation roller 13a and a reverse rotation roller 13b incorporated between a cylindrical face 11 formed on the inner periphery of the outer ring 3 and one of a plurality of cam faces 12 formed on the outer periphery of the inner ring 4 in axially spaced relation. The rollers 13a, 13b are held by a cage 14 whose rotation is controlled by the electromagnetic clutch 30. The group of positive rotation rollers 13a arrayed in the peripheral direction are arranged in a range from the peripheral center position of the cam face 12 to a position close to one peripheral end, and the group of reverse rotation rollers 13b are arranged in a range from the peripheral center position of the cam face 12 to a position close to the other peripheral end. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotation transmission device that transmits and blocks rotational torque between an outer ring and an inner ring incorporated inside the outer ring.

  As a rotation transmission device of this type, as 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 provided with the two-way clutch. Conventionally known is one in which engagement and disengagement of the clutch is controlled, and the outer ring and the inner ring are coupled by the engagement of the two-way clutch so that torque is transmitted between the outer ring and the inner ring. Yes.

  As shown in FIG. 6 (I), the two-way clutch has a cylindrical surface 41 formed on the inner periphery of the outer ring 40, and both ends in the circumferential direction between the inner ring 42 and the cylindrical surface 41 are narrow. A cam surface 43 forming a wedge-shaped space is provided, a roller 44 is incorporated between the cam surface 43 and the cylindrical surface 41, and the roller 44 is made cylindrical by relative rotation of the retainer 45 holding the roller 44 and the inner ring 42. 41 and the cam surface 43 are engaged with each other.

  Here, the retainer 45 is elastically held at a neutral position where the roller 44 is disengaged from the cylindrical surface 41 and the cam surface 43 by a switch spring (not shown) incorporated between the retainer 45 and the inner ring 42.

  On the other hand, although not shown in the figure, the electromagnetic clutch faces the rotor connected to the outer ring 40 on the armature that is prevented from rotating by the retainer 45 and is movably supported in the axial direction, and the electromagnet faces the rotor. By energizing the electromagnet, the armature is attracted to the rotor, and the roller 44 is engaged with the cylindrical surface 41 and the cam surface 43 by the relative rotation of the armature coupled to the outer ring 40 and the inner ring 42.

JP 2005-337486 A

  By the way, in the two-way clutch in the rotation transmission device, the roller 44 is pushed into the narrow portion on the left side toward the wedge-shaped space and rotated in the direction indicated by the arrow of the inner ring 42 as shown in FIG. When the rotation direction is switched in a state in which is transmitted to the outer ring 40, the roller 44 moves to the right side as indicated by a chain line in the figure and is pushed into the narrow portion on the right side of the wedge-shaped space.

At this time, the moving angle θ ₃ of the roller 44 becomes a backlash in the rotational direction of the two-way clutch, and since the backlash in the rotational direction is large, a shock is generated when the roller 44 is engaged, There is a concern that the life of the clutch may be reduced.

  In addition, when applied to a member that transmits torsional torque, such as a steering device and a stabilizer, there is a disadvantage that vibration is generated due to the impact load, giving an unpleasant feeling, and the use is often limited.

  An object of the present invention is to provide a rotation transmission device that reduces backlash in the rotational direction of a two-way clutch and is less restricted by the application.

  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 inner ring is incorporated between the outer ring and the inner 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, and the two-way clutch forms a cylindrical surface on one of the inner periphery of the outer ring and the outer periphery of the inner ring, and the other in the circumferential direction between the cylindrical surface. A plurality of cam surfaces that form a narrow wedge-shaped space at both ends are provided at equal intervals, a roller is incorporated between each cam surface and the cylindrical surface, and the roller is incorporated between the outer ring and the inner ring and rotated by an electromagnetic clutch. A neutral position in which the roller is disengaged from the cylindrical surface and the cam surface between the retainer and the member of the outer ring and the inner ring on the side where the cam surface is formed. To retain the elastic In the rotation transmission device configured to incorporate a holding switch spring, the roller groups arranged in the circumferential direction are provided in a double row in the axial direction, and one roller group is circumferentially arranged from the center position of the circumferential length of the cam surface. The other roller group is arranged at a position offset from one end side of the cam surface to the other end side in the circumferential direction from the center position of the circumferential length of the cam surface.

  As described above, among the roller groups provided in double rows, one roller group is arranged at a position offset from the center position of the circumferential length of the cam surface to one end side in the circumferential direction, and the other roller group is By arranging the cam surface at a position offset from the center position of the circumferential length to the other end side in the circumferential direction, the rotation is controlled by the member on the cam surface side of the outer ring and the inner ring and the electromagnetic clutch. When the cage rotates relative to one direction, one roller group immediately engages the cylindrical surface and the cam surface, and when the inner ring and cage rotate relative to each other, the other roller group moves to the cylindrical surface and cam surface. The rotation transmission device that is immediately engaged with the cam surface and has little play in the rotational direction and is less restricted by the application can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, a bearing 2 is incorporated in a cylindrical housing 1, and an outer ring 3 incorporated in the housing 1 is rotatably supported by the bearing 2.

  An inner ring 4 is incorporated inside the outer ring 3, and the inner ring 4 and the outer ring 3 are relatively rotatably supported by a bearing 5 incorporated between opposing portions. A serration 6 is formed on the inner periphery of the inner ring 4, and the inner ring 4 is coupled to a rotating shaft (not shown) via the serration 6.

  A two-way clutch 10 is incorporated between the outer ring 3 and the inner ring 4. As shown in FIG. 1 and FIG. 4, the two-way clutch 10 forms a cylindrical surface 11 on the inner periphery of the outer ring 3, and both ends in the circumferential direction are narrow on the outer periphery of the inner ring 4 with the cylindrical surface 11. A plurality of flat cam surfaces 12 forming a wedge-shaped space are continuously provided in the circumferential direction, and between the respective cam surfaces 12 and the cylindrical surface 11, a normal rotation roller 13a and a reverse rotation roller are provided for one cam surface 12. The two rollers 13b are assembled with an interval in the axial direction, and each of the forward rotation roller 13a group and the reverse rotation roller 13b group arranged in the circumferential direction is held by a retainer 14 incorporated between the outer ring 3 and the inner ring 4. ing.

  Here, as shown in FIG. 4, the retainer 14 includes the same number of first pockets 15a as the number of rollers 13a for individually accommodating the rollers 13a of the normal rotation roller 13a group, and a reverse rotation roller as shown in FIG. The second pocket 15b that individually accommodates each of the rollers 13b of the group 13b has a first pocket 15a that is offset from the central position of the circumferential length of the cam surface 12 toward one end in the circumferential direction of the wedge-shaped space. On the other hand, the second pocket 15b is formed at a position offset from the center position of the circumferential length of the cam surface 12 to the other circumferential end side of the wedge-shaped space, and the rollers 13a and 13b are connected to the cylindrical surface 11 and The cam surface 12 is held in a neutral position released from engagement.

  As shown in FIGS. 1 and 3, a spring accommodating recess 17 is formed at one end of the inner ring 4, and a switch spring 18 is incorporated in the spring accommodating recess 17. The switch spring 18 has a ring shape having a cut-off end in a part in the circumferential direction, and a pair of pressing pieces 18 a provided outward from the cut-off end are provided with a cut-out portion 19 formed on the peripheral wall of the spring accommodating recess 17 and a holding portion. It inserts into the notch 20 provided at the end of the container 14 and presses the opposite sides in the circumferential direction of the notch 19 and the notch 20 in opposite directions. The cage 14 is elastically held at a neutral position where each roller of the roller 13b group is disengaged from the cylindrical surface 11 and the cam surface 12.

  The switch spring 18 is prevented from coming out of the spring accommodating recess 17 by the connecting plate 21 fitted to the small diameter cylindrical portion 4 a at the end of the inner ring 4. The connecting plate 21 is positioned in the axial direction by a retaining ring 22, and an L-shaped engagement piece 23 is provided on the outer periphery. The engagement piece 23 engages with the notch 20 provided at the end of the retainer 14, and the connecting plate 21 is prevented from rotating around the retainer 14 by the engagement.

  As shown in FIGS. 1 and 2, an electromagnetic clutch 30 that controls the engagement and disengagement of the two-way clutch 10 is provided between the outer ring 3 and the retainer 14 in addition to the two-way clutch 10. It has been.

  The electromagnetic clutch 30 includes an armature 31 disposed to face the end face of the cage 14, a rotor 32 that faces the armature 31 in the axial direction, and an electromagnet 33 that faces the rotor 32 in the axial direction.

  As shown in FIG. 2, the armature 31 is slidably fitted to a small diameter cylindrical portion 4 a provided at the end of the inner ring 4. An engagement hole 34 is formed in the armature 31, and the engagement piece 23 on the outer periphery of the connecting plate 21 is engaged with the engagement hole 34, and the armature 31 is prevented from rotating with respect to the retainer 14 by the engagement. And is movable in the axial direction.

  The rotor 32 is press-fitted into the end portion of a rotor guide 36 made of a non-magnetic material connected to the opening end portion of the outer ring 3 and is prevented from rotating around the rotor guide 36. A plurality of arc-shaped slits 37 are formed in the rotor 32 at intervals in the circumferential direction.

  An elastic member 38 that urges the armature 31 in a direction away from the rotor 32 is incorporated between the facing end surfaces of the armature 31 and the rotor 32.

  The electromagnet 33 includes an electromagnetic coil 33a and a core 33b that supports the electromagnetic coil 33a. When the electromagnetic coil 33a is energized, a magnetic flux flows through the core 33b, the rotor 32, and the armature 31, and an attractive force is applied to the armature 31. It has come to be.

  The rotation transmission device shown in the embodiment has the above structure, and FIG. 2 shows the disengaged state of the two-way clutch 10, and even if the inner ring 4 rotates, the rotation is not transmitted to the outer ring 3, but the inner ring 4 rotates freely.

  When the electromagnetic coil 33 a of the electromagnet 33 is energized in the rotation state of the inner ring 4, magnetic flux flows between the core 33 b, the rotor 32, and the armature 31, and a magnetic attractive force is loaded on the armature 31, and the armature 31 is attracted to the rotor 32. The

  As the armature 31 is attracted, the frictional resistance acting on the attracting surface becomes the rotational resistance of the cage 14, so that the inner ring 4 and the cage 14 rotate relative to each other.

Here, when the inner ring 4 rotates with respect to the cage 14 in the direction indicated by the arrow in FIG. 4 (I), the forward rotation roller 13a accommodated in the first pocket 15a is indicated by a chain line in FIG. 4 (II). Thus, the cylindrical surface 11 and the cam surface 12 are engaged. At this time, since the first pocket 15a is formed at a position offset from the center position of the circumferential length of the cam surface 12 toward one end in the circumferential direction of the wedge-shaped space, the inner ring 4 and the retainer 14 are shown in FIG. When the angle θ only ₁ minute relative rotation shown, the forward rotation roller 13a in the first pocket 15a is engaged immediately engages the cylindrical surface 11 and the cam surface 12, two-way clutch 10 becomes engaged, the rotation of the inner ring 4 It is transmitted to the outer ring 3.

When the inner ring 4 rotates relative to the cage 14 in the direction indicated by the arrow in FIG. 5 (I), the reverse rotation roller 13b accommodated in the second pocket 15b is indicated by the chain line in FIG. 5 (II). The cylindrical surface 11 and the cam surface 12 are engaged with each other. At this time, since the second pocket 15b is formed at a position offset from the center position of the circumferential length of the cam surface 12 to the other circumferential end side of the wedge-shaped space, the inner ring 4 and the retainer 14 are shown in FIG. Is rotated by the angle θ ₂ shown in FIG. 2, the reverse rotation roller 13 b in the second pocket 15 b immediately engages with the cylindrical surface 11 and the cam surface 12, and the two-way clutch 10 enters the engaged state, and the inner ring 4 rotates. Is transmitted to the outer ring 3.

  As described above, when the inner ring 4 and the cage 14 are rotated relative to each other, the forward rotation roller 13a accommodated in the first pocket 15a or the reverse rotation roller 13b accommodated in the second pocket 15b becomes the cylindrical surface 11 and the cam surface 12. Since there is very little play in the rotational direction, there is no engagement shock or noise during engagement.

  When the energization of the electromagnet 33 shown in FIG. 1 to the electromagnetic coil 33a is interrupted in the engaged state of the two-way clutch 10, the armature 31 is separated from the rotor 32 by the restoring force of the elastic member 38 and the restoring elasticity of the switch spring 18 is restored. As a result, the retainer 14 rotates and the engaged normal rotation roller 13a incorporated in the first pocket 15a or the engaged reverse rotation roller 13b incorporated in the second pocket 15b returns to the neutral position. Then, the two-way clutch 10 is disengaged, the rotation transmission from the inner ring 4 to the outer ring 3 is interrupted, and the inner ring 4 rotates freely.

  In the embodiment, the cylindrical surface 11 is formed on the inner periphery of the outer ring 3 and the cam surface 12 is provided on the outer periphery of the inner ring 4. On the contrary, the cylindrical surface is formed on the outer periphery of the inner ring 4, A cam surface may be provided on the inner periphery. In this case, a switch spring is incorporated between the cage and the outer ring to elastically hold the cage so that each of the forward rotation roller and the reverse rotation roller is held in the neutral position, and the electromagnetic clutch rotor is used as the inner ring. The rotation of the outer ring is transmitted to the inner ring when the two-way clutch is engaged by inputting rotation torque to the outer ring while preventing the rotation of the rotating shaft to be connected.

Longitudinal front view showing an embodiment of a rotation transmission device according to the present invention Sectional drawing which expands and shows the two-way clutch part of FIG. Sectional view along line III-III in FIG. (I) is a cross-sectional view taken along line IV-IV in FIG. 1, and (II) is a cross-sectional view showing a part of (I) in an enlarged manner. (I) is a cross-sectional view taken along line VV in FIG. 1, and (II) is a cross-sectional view showing an enlarged part of (I). (I) is a sectional view of a two-way clutch of a conventional rotation transmission device, and (II) is a sectional view showing an engaged state of the two-way clutch.

Explanation of symbols

3 Outer ring 4 Inner ring 10 Two-way clutch 11 Cylindrical surface 12 Cam surface 13a Forward rotation roller (roller)
13b Roller for reverse rotation (roller)
14 Cage 18 Switch spring 30 Electromagnetic clutch

Claims (1)

A two-way clutch for coupling and releasing the outer ring and the inner ring is incorporated between the outer ring and the inner ring incorporated therein, and the electromagnetic clutch for controlling engagement and disengagement of the two-way clutch is a two-way clutch. A plurality of the two-way clutches form a cylindrical surface on one of the inner periphery of the outer ring and the outer periphery of the inner ring, and a narrow wedge-shaped space at both ends in the circumferential direction between the other and the cylindrical surface. Cam surfaces are provided at equal intervals, a roller is incorporated between each cam surface and the cylindrical surface, the roller is incorporated between the outer ring and the inner ring, and held by a cage whose rotation is controlled by an electromagnetic clutch. A switch spring that elastically holds the cage in a neutral position where the roller is disengaged from the cylindrical surface and the cam surface between the outer ring and the inner ring on the side where the cam surface is formed. Times In transmission,
The roller groups arranged in the circumferential direction are provided in double rows in the axial direction, and one roller group is disposed at a position offset from the central position of the circumferential length of the cam surface toward one end side in the circumferential direction, and the other roller group is A rotation transmission device, wherein the rotation transmission device is arranged at a position offset from the center position of the circumferential length of the cam surface toward the other end side in the circumferential direction.

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