JP2008144948A - Rotation transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation transmission device reducing the thickness of an armature. <P>SOLUTION: A two-way clutch 10 is installed between an outer ring 1 and an inner ring 2 installed on the inner side of the outer ring, and an electromagnetic clutch 20 controlling engagement and disengagement of the two-way clutch 10 is provided side by side together with the two-way clutch 10. The electromagnetic clutch 20 is composed of the armature 21 rotationally locked to the retainer 14 of the two-way clutch 10, a switching plate 23 arranged opposite to the armature 21, a rotor 22 arranged opposite to the switching plate 23, an electromagnet 25 arranged opposite to the rotor 22, and a separating spring 24 energizing the switching plate 23 in a direction separated from the rotor 22. A pair of opposite projecting pieces 27 directed into the outer ring 1 is formed on the inner periphery of the armature 1, and an engagement piece 28 arranged at the opening end of the retainer 14 is fitted between the pair of opposite projecting pieces 27. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotation transmission device that transmits and blocks rotational torque between a drive shaft and a driven shaft.

  A steer-by-wire that manipulates the steering angle of the steering gear via a steering actuator controlled by the controller according to the steering angle of the steering wheel, and transmits the steering reaction force controlled by the controller to the steering wheel via the reaction force simulator. In the system, since the steering wheel and the steering gear are not mechanically connected, if the steering actuator, the reaction force simulator, or the like breaks down, the steering may become impossible.

  In order to eliminate such inconvenience, in the steer-by-wire system described in Patent Document 1, between the first shaft that transmits the rotation of the steering wheel and the second shaft that transmits the rotational torque to the steering gear, A rotation transmission device including a two-way clutch and an electromagnetic clutch for controlling the two-way clutch is provided, and when the steering actuator, reaction force simulator, or the like breaks down, the first shaft is driven by the two-way clutch of the rotation transmission device. And the second shaft are coupled so that the steering wheel can be directly steered.

  Here, the two-way clutch forms a cylindrical surface on the inner periphery of the outer ring connected to the second shaft, and the outer periphery of the inner ring connected to the first shaft is connected to the outer surface of the outer ring connected to the first shaft. A cam surface is formed between the cam surface and the cylindrical surface, and the cage is held by the relative rotation of the cage and the inner ring. The combination is engaged with the cylindrical surface and the cam surface. 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, the electromagnetic clutch includes a rotor disposed coaxially with the outer ring, an armature that is movable in the axial direction between the rotor and the cage and is prevented from rotating with respect to the cage, and the armature A switching plate supported so as to be movable in the axial direction between the rotor and the rotor, a separation spring that urges the switching plate in a direction away from the rotor, and opposed to the rotor. A cage that consists of an electromagnetic coil to be adsorbed, and when the energization of the electromagnetic coil is released, the switching plate is separated from the rotor by the pressing force of the separation spring, and the armature is pressed against the opening end of the outer ring, and the armature is prevented from rotating. The inner ring and the inner ring are engaged with each other by engaging the engaging element with the cylindrical surface and the cam surface. Combined, so that transmit rotation of the first shaft to the second shaft.

JP 2005-262969 A

  By the way, in the rotation transmission device described in Patent Document 1, an engagement hole is formed in the armature, and a projecting piece provided at the opening end of the cage is fitted into the engagement hole to prevent the armature from rotating. Because of this configuration, it is necessary to increase the axial fitting length between the engagement hole and the projecting piece in order to reliably prevent the armature from rotating.

  For this reason, it is necessary to employ a thick armature, and there is a problem in reducing the weight and size of the rotation transmission device.

  An object of the present invention is to provide a rotation transmission device capable of reducing the thickness 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 incorporating the joint between the outer ring and the inner ring is incorporated, and an electromagnetic clutch that controls the rotation of the cage is provided along with the two-way clutch. The clutch is arranged to face the opening end face of the outer ring and is prevented from rotating by the retainer, and the rotor is arranged to face the armature. The clutch is movable in the axial direction between the opposed faces of the rotor and the armature. A switching plate, a separation spring that urges the switching plate in a direction away from the rotor, and opposed to the rotor. In the rotation transmission device comprising an electromagnet that attracts the switching plate to the rotor, a pair of opposing protrusions facing the inside of the outer ring is formed by bending on the inner periphery of the armature, and the cage is interposed between the opposing pair of protrusions. A configuration is adopted in which the armature is prevented from rotating by fitting an engagement piece provided at the opening end of the armature.

  As described above, by forming a pair of opposed protruding pieces on the inner peripheral portion of the armature by bending, and engaging the engaging piece provided at the opening end of the cage between the opposed pair of protruding pieces, Even when a thin-walled armature is used, it is possible to secure a sufficient axial fitting length to prevent the armature from rotating between a pair of opposed protruding pieces and engaging pieces. Thus, the rotation transmission device can be reduced in weight and size.

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

  The shaft end of the first shaft 4 is fitted inside the inner ring 2. The first shaft 4 is prevented from being pulled out by a retaining ring 5 attached to the end of the shaft, and is prevented from rotating by the serration 6 formed between the fitting surfaces with the inner ring 2.

  The outer ring 1 is closed at one end, and a serration hole 8 for connecting the second shaft 7 is formed at the closed end.

  A two-way clutch 10 that couples and uncouples the outer ring 1 and the inner ring 2 is incorporated between opposing surfaces of the large-diameter portion 2a formed on the outer ring 1 and 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 continuously 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 connected to the outer ring. It is held by a cage 14 incorporated between 1 and the inner ring 2.

  Further, a cylindrical portion 15 is formed on the end face of the large-diameter portion 2a on the outer ring opening side, a switch spring 16 that is partly separated in the cylindrical portion 15 is incorporated, and a pair formed at both ends of the switch spring 16. The pressing piece 16a is fitted into a notch 18 provided at an end of the retainer 14 from a notch 17 formed in the cylindrical portion 15, and is opposed to the notch 17 and the notch 18 in the circumferential direction. By pressing the side surfaces in opposite directions, the roller 13 elastically holds the retainer 14 at a position where the roller 13 is disengaged from the cylindrical surface 11 and the cam surface 12.

  As shown in FIG. 1, on the first shaft 4 connected to the inner ring 2, an electromagnetic clutch 20 that controls the engagement and disengagement of the two-way clutch 10 is provided side by side with the two-way clutch 10. Is provided.

  The electromagnetic clutch 20 includes an armature 21 disposed to face the opening end surface of the outer ring 1, a rotor 22 made of a magnetic material disposed to face the armature 21, and a switching plate 23 incorporated between the rotor 22 and the armature 21. , A separation spring 24 that urges the switching plate 23 in a direction away from the rotor 22, and an electromagnet 25 that is opposed to the rotor 22 in the axial direction.

  As shown in FIGS. 5 and 6, the armature 21 has a ring shape, and a plurality of notches 26 are formed in the inner periphery at intervals in the circumferential direction, and the inside of the outer ring 1 is formed on both sides of each notch 26. A pair of opposed projecting pieces 27 facing the surface are formed by bending. An engagement piece 28 provided at the opening end of the retainer 14 is fitted between the pair of opposed protrusions 27, and the armature 21 is held by the engagement of the engagement piece 28 and the pair of opposed protrusions 27. It is prevented from rotating with respect to the container 14.

  As shown in FIG. 4, the rotor 22 has a plurality of arc-shaped slits 29 formed on the same circle at equal intervals. The rotor 22 is formed with cylindrical portions 22a and 22b facing in the same direction on the outer periphery and the inner periphery, and the inner cylindrical portion 22b is fitted into the first shaft 4 and integrated.

  Here, the first shaft 4 is formed with a large-diameter shaft portion 4a that movably supports the switching plate 23, and the rotor 22 is positioned in the axial direction by contact with the end surface of the large-diameter shaft portion 4a. A constant interval is formed between the outer ring 1 and the opening end face.

  A concave portion 30 is formed in the outer peripheral portion of the switching plate suction surface 22c of the rotor 22, and the outer peripheral portion of the switching plate 23 is pressed by the separation spring 24 by incorporating the separation spring 24 into the concave portion 30. . By the pressing, as shown in FIG. 5, the armature 21 is pressed against the opening end surface 1 a of the outer ring 1, and the switching plate 23 is pressed against the armature 21.

  As shown in FIG. 1, the electromagnet 25 includes an electromagnetic coil 25 a and a core 25 b that supports the electromagnetic coil 25 a, and the core 25 b is supported by a stationary member 31.

  The rotation transmission device shown in the embodiment has the above-described structure, and when the rotation transmission device is employed in the steer-by-wire system disclosed in Patent Document 1, the rotation of the steering wheel is transmitted to the first shaft 4. In addition, the rotation of the second shaft 7 is transmitted to the steering gear. During normal operation, the electromagnetic coil 25a of the electromagnet 25 is energized, and when the steering becomes impossible due to a failure in the electric system, the energization of the electromagnetic coil 25a is cut off.

  FIG. 4 shows a state of energization of the electromagnet 25 to the electromagnetic coil 25a. By the energization, a magnetic flux flows through the core 25b, the rotor 22 and the switching plate 23, the switching plate 23 is attracted to the rotor 22, and the armature 21 with respect to the outer ring 1 The connection is released.

  Therefore, when the inner ring 2 rotates together with the first shaft 4 by steering the steering wheel, the rotation is transmitted to the retainer 14 via the switch spring 16, and the retainer 14 rotates together with the inner ring 2, as shown in FIG. As described above, the roller 13 rotates while being held in the neutral position where the engagement with the cylindrical surface 11 and the cam surface 12 is released. For this reason, the rotation of the inner ring 2 that rotates together with the first shaft 4 is not transmitted to the outer ring 1, and the first shaft 4 and the inner ring 2 rotate freely.

  Here, since the separation spring 24 is formed of a non-magnetic material, it is possible to prevent the magnetic flux from flowing through the separation spring 24. Therefore, the magnetic attraction force with respect to the switching plate 23 is increased, and the rotor 22 and the switching plate. The bonding force of 23 can be increased.

  When the energization to the electromagnetic coil 25a is released, the switching plate 23 moves away from the rotor 22 due to the restoring elasticity of the separation spring 24, and as a result, the armature 21 opens the end face of the outer ring 1 as shown in FIG. It is pressed against la and is coupled to the outer ring 1.

  Therefore, when the inner ring 2 rotates together with the first shaft 4 by steering the steering wheel, the inner ring 2 and the cage 14 rotate relative to each other, and the roller 13 engages with the cylindrical surface 11 and the cam surface 12 due to the relative rotation. The two-way clutch 10 is connected to the inner ring 2 and the outer ring 1.

  For this reason, the steering gear can be manually operated by the steering wheel.

  When the cage 14 and the inner ring 2 are relatively rotated, the switch spring 16 is elastically deformed. For this reason, when the electromagnetic coil 25a is energized and the switching plate 23 is attracted to the rotor 22 after repair of the failure of the electric system, the retainer 14 returns and rotates due to the restoring elasticity of the switch spring 16, as shown in FIG. Then, the roller 13 is returned to the neutral position where the engagement with the cylindrical surface 11 and the cam surface 12 is released.

  As shown in the embodiment, a pair of opposed protrusions 27 are formed on the inner peripheral portion of the armature 21 by bending, and an engagement piece provided at the open end of the cage 14 between the pair of opposed protrusions 27. By fitting 28, it is possible to sufficiently secure an axial fitting length for preventing rotation of the armature 21 between the pair of opposed projecting pieces 27 and the engaging piece 28 regardless of the thickness of the armature 21. it can.

  As a result, the armature 21 can be thinned and the rotation transmission device can be reduced in weight and size.

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 along line III-III in FIG. Sectional view showing switching plate adsorption state Sectional view showing the adsorption release state of the switching plate Perspective view showing armature

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 10 Two-way clutch 13 Roller (engagement element)
14 Cage 20 Electromagnetic Clutch 21 Armature 22 Rotor 23 Switching Plate 24 Separation Spring 25 Electromagnet 27 Projection Piece 28 Engagement Piece

Claims (1)

Between the outer ring and the inner ring incorporated therein, there is an engagement element and a cage that holds the engagement element, and the engagement element is engaged between 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 rotation of the retainer is provided along with the two-way clutch, and the electromagnetic clutch is disposed opposite to the opening end surface of the outer ring. A ring-shaped armature that is prevented from rotating by a cage, a rotor that is disposed so as to face the armature, a switching plate that is axially movable between opposed surfaces of the rotor and the armature, and the switching plate that serves as the rotor A retraction spring that urges in a direction away from the electromagnet, and an electromagnet disposed opposite to the rotor and attracting the switching plate to the rotor by energization In the rotation transmitting device comprising a,
A pair of opposing protrusions facing the inside of the outer ring is formed by bending at the inner periphery of the armature, and an engagement piece provided at the opening end of the cage is fitted between the opposing pair of protrusions. A rotation transmission device characterized by preventing rotation.

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