JP2009144737A - Rotation transmission device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation transmission device capable of miniaturizing an electromagnetic clutch. <P>SOLUTION: In this rotation transmission device, a roller 8 is incorporated between a cylindrical surface 3 of an outer ring 2 and a cam surface 5 of an inner ring 4, and the roller 8 is engaged with the cylindrical surface 3 and the cam surface 5 by relative rotation of a cage 6 and the inner ring 4. The electromagnetic clutch 20 for controlling engagement and an engagement release is arranged on one side of a two-way clutch 1 for transmitting rotational torque between mutual ones of the outer ring 2 and the inner ring 4. The electromagnetic clutch 20 is formed of an armature 21 movable in the axial direction, a rotor 22 opposed to the armature 21 and an electromagnet 23 attracting the armature 21 to the rotor 22 by current-carrying. A rolling bearing 33 composed of a magnetic member is incorporated between an inside cylindrical part 22b formed in the rotor 22 and the electromagnet 23, and when carrying an electric current to the electromagnet 23, a magnetic flux is made to flow with the rolling bearing 33 as a magnetic path, and even when adopting the small electromagnet 23, attraction force of the sufficient size is applied to the armature 21. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  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 this rotation transmission device, a two-way clutch is built in between the outer ring and the inner ring built in the inner ring, and the engagement and disengagement of the two-way clutch are controlled by an electromagnetic clutch attached to the two-way clutch, The outer ring and the inner ring are coupled by the engagement of the two-way clutch, and rotational torque is transmitted between the outer ring and the inner ring.

  Here, the two-way clutch is formed with a cylindrical surface on the inner periphery of the outer ring, and provided with a cam surface on the outer periphery of the inner ring that forms a wedge-shaped space in which 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 the relative rotation of the retainer that holds the roller and the inner ring. Further, a switch spring is incorporated between the inner ring and the cage, and the cage is elastically held at the neutral position where the roller is disengaged from the cylindrical surface and the cam surface by the switch spring.

On the other hand, the electromagnetic clutch faces the rotor connected to the outer ring to the armature that is supported by the cage and is movably supported in the axial direction, and the electromagnet is opposed to the rotor, and the electromagnet is energized. By shutting off, the armature is attracted to or released from the rotor, and in this attracted state, 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 inner ring. .
JP 11-336799 A

  By the way, in the rotation transmission device described in the above-mentioned Patent Document 1, the electromagnet is formed between the outer diameter surface of the core and the inner diameter surface of the outer cylindrical portion formed on the outer periphery of the rotor and between the inner diameter surface of the core and the inner periphery of the rotor. Since a gap (air gap) is provided between the outer diameter surfaces of the inner cylindrical portion and the air gap is used as a magnetic path so as to allow a magnetic flux to be applied to the armature to flow, a sufficiently large magnetic flux is obtained. Therefore, it is necessary to use a large electromagnet, and there is a disadvantage that the electromagnetic clutch becomes large.

  An object of the present invention is to provide a rotation transmission device capable of miniaturizing an electromagnetic clutch.

  In order to solve the above-mentioned problem, in the first invention, an engaging element and a retainer for holding the engaging element are incorporated between the inner periphery of the outer ring and the outer periphery of the inner ring incorporated inside the outer ring. A two-way clutch for transmitting rotational torque between the outer ring and the inner ring by engaging the engagement element with the inner circumference of the outer ring and the outer circumference of the inner ring by relative rotation of the inner ring, and controlling the rotation of the cage of the two-way clutch. An electromagnetic clutch that controls engagement and disengagement of the engagement element, the electromagnetic clutch being prevented from rotating with respect to the cage and supported in an axially movable manner, and the outer ring A rotor that is coupled and axially opposed to the armature, and has a cylindrical portion formed on the outer periphery and inner periphery thereof, and a fixedly disposed electromagnet disposed between the inner and outer cylindrical portions of the rotor and opposed to the rotor in the axial direction; The armature In a rotation transmission device having a separation spring that urges in a direction away from the rotor, the electromagnet and the rotor are relatively rotatable between the core supporting the electromagnetic coil of the electromagnet and the inner cylindrical portion of the rotor. The structure in which the magnetic member to be supported is incorporated is adopted.

  As described above, by incorporating a magnetic member that supports the electromagnet and the rotor so as to be relatively rotatable, the magnetic member acts as a magnetic path when the electromagnetic coil is energized. Even in this case, a sufficiently large magnetic flux can be formed, and the armature can be reliably adsorbed to the rotor.

  Here, when a rolling bearing made of a magnetic material is employed as the magnetic member, the rotational resistance of the rotor is small, and the rotor can be smoothly rotated relative to the electromagnet.

  In this case, the rolling bearing is magnetized by energization of the electromagnetic coil, and the life of the bearing may be reduced by attracting contamination such as iron powder. Therefore, it is preferable to employ a bearing with both seals as the rolling bearing.

  In the rotation transmission device according to the first invention, the electromagnet and the rotor are disposed between the outer diameter surface of the core supporting the electromagnetic coil of the electromagnet and the outer cylindrical portion of the rotor, and between the inner diameter surface of the core and the inner cylindrical portion of the rotor. By incorporating a magnetic member that is relatively rotatably supported, the magnetic member also becomes a magnetic path, so a smaller electromagnet can be employed.

  In order to solve the above-mentioned problem, in the second invention, an engagement element and a retainer for holding the engagement element are incorporated between the inner periphery of the outer ring and the outer periphery of the inner ring incorporated inside the outer ring. A two-way clutch for transmitting rotational torque between the outer ring and the inner ring by engaging the engagement element with the inner circumference of the outer ring and the outer circumference of the inner ring by relative rotation of the inner ring, and controlling the rotation of the cage of the two-way clutch. An electromagnetic clutch that controls engagement and disengagement of the engagement element, the electromagnetic clutch being prevented from rotating with respect to the cage and supported in an axially movable manner, and the outer ring A rotor that is coupled and axially opposed to the armature, and has a cylindrical portion formed on the outer periphery and inner periphery thereof, and a fixedly disposed electromagnet disposed between the inner and outer cylindrical portions of the rotor and opposed to the rotor in the axial direction; The armature In a rotation transmission device having a separation spring biased in a direction away from the rotor, between the outer diameter surface of the core supporting the electromagnetic coil of the electromagnet and the outer cylindrical portion of the rotor, and between the inner diameter surface of the core and the inner side of the rotor A configuration is adopted in which a magnetic member for relatively rotatably supporting the electromagnet and the rotor is incorporated between the cylindrical portions.

  As described above, by incorporating a magnetic member between the outer diameter surface of the core and the outer cylindrical portion of the rotor, and between the inner diameter surface of the core and the inner cylindrical portion of the rotor, the magnetic member becomes a magnetic path when energizing the electromagnetic coil. Thus, since the magnetic flux flows, a sufficiently large magnetic flux can be formed even when a small electromagnet is employed, and the armature can be reliably adsorbed to the rotor.

  In the rotation transmission device according to the second aspect of the present invention, by incorporating a rolling bearing made of a non-magnetic material between the input shaft connected to the electromagnet and the inner ring and supporting it relatively rotatably, the magnetic flux is applied to the input shaft. Leakage can be prevented and a reduction in suction force against the armature can be suppressed.

  As described above, in the rotation transmission device according to the first aspect of the present invention, the magnetic member that rotatably supports the electromagnet and the rotor between the core that supports the electromagnetic coil of the electromagnet and the inner cylindrical portion of the rotor. Since the magnetic member serves as a magnetic path and the magnetic flux flows, the attractive force to the armature can be increased.

  For this reason, even when a small electromagnet is employed, a sufficiently large magnetic flux can be formed, and the electromagnetic clutch can be miniaturized.

  Further, in the rotation transmission device according to the second invention, the electromagnet between the outer diameter surface of the core supporting the electromagnetic coil of the electromagnet and the outer cylindrical portion of the rotor, and between the inner diameter surface of the core and the inner cylindrical portion of the rotor, By incorporating a magnetic member that supports the rotor in a relatively rotatable manner, the magnetic member acts as a magnetic path and magnetic flux flows. Therefore, even when a small electromagnet is used, a sufficiently large magnetic flux is formed. Thus, the electromagnetic clutch can be reduced in size.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a rotation transmission device according to the present invention. As illustrated, the rotation transmission device includes a two-way clutch 1 and an electromagnetic clutch 20 that controls engagement and disengagement of the two-way clutch 1.

  As shown in FIG. 1 and FIG. 2 (I), the two-way clutch 1 forms a cylindrical surface 3 on the inner periphery of the outer ring 2 and the cylindrical surface 3 on the outer periphery of the inner ring 4 incorporated inside the outer ring 2. A plurality of cam surfaces 5 that form a narrow wedge space at both ends in the circumferential direction are provided at intervals in the circumferential direction between the outer ring 2 and the inner ring 4. Pockets 7 are formed at positions opposite to each other, and rollers 8 as engaging members are accommodated in the respective pockets 7, and the rollers 8 are engaged with narrow portions of the wedge space by the relative rotation of the inner ring 4 and the cage 6. Rotational torque is transmitted between the inner ring 4 and the outer ring 2.

  Here, the inner ring 4 has a small-diameter cylindrical part 4a at one end, and the outer ring 2 and the inner ring 4 are relatively rotatably supported by a bearing 9 fitted in the small-diameter cylindrical part 4a. The inner ring 4 is connected to an input shaft 10 indicated by a chain line in FIG. For the connection, a serration 11 is formed on the inner periphery of the inner ring 4.

  As shown in FIGS. 1 and 3, a spring accommodating recess 12 is formed on the other end surface of the inner ring 4, and a switch spring 13 is incorporated in the spring accommodating recess 12. The switch spring 13 has a C shape, and a pair of pressing pieces 13 a provided outward from both ends thereof are provided with a notch 12 a formed on the peripheral wall of the spring accommodating recess 12 and a notch provided at the end of the cage 6. Neutral that is inserted into 14 and presses the opposite sides in the circumferential direction of notch 12a and notch 14 in opposite directions, and each roller 8 is disengaged from cylindrical surface 3 and cam surface 5 by the pressing. The cage 6 is elastically held so as to be held in position.

  As shown in FIG. 1, the electromagnetic clutch 20 includes an armature 21 disposed to face the end face of the cage 6, a rotor 22 that faces the armature 21 in the axial direction, and an electromagnet 23 that faces the rotor 22 in the axial direction. And a separation spring 24 that urges the armature 21 in a direction away from the rotor 22.

  The armature 21 is prevented from rotating with respect to the cage 6 and is movable in the axial direction. In order to prevent the armature 21 from rotating with respect to the cage 6 and to be movable in the axial direction, here, a connecting plate 25 is fitted into the opening end of the cage 6, and the outer periphery of the connecting plate 25 is A plurality of L-shaped bent pieces 26 formed on the armature 21 are engaged with a notch 27 formed at the end of the cage 6, and an end portion of the bent piece 26 is engaged with an armature 21. It is slidably inserted into the hole 28.

  The rotor 22 has cylindrical portions 22a and 22b on the outer periphery and the inner periphery, and a plurality of arc-shaped slits 29 are formed on the same circle at intervals on the surface facing the armature 21. The rotor 22 is fitted in a rotor guide 30 made of a non-magnetic material connected to the opening end of the outer ring 2 and is prevented from rotating, and is positioned in the axial direction by a retaining ring 31 incorporated between the fitting surfaces. Has been.

  The electromagnet 23 includes an electromagnetic coil 23a and a core 23b that supports the electromagnetic coil 23a. The electromagnet 23 is disposed between the outer cylindrical portion 22 a and the inner cylindrical portion 22 b of the rotor 22, and the core 23 b is supported by the stationary member 32.

  Between the core 23 b of the electromagnet 23 and the end of the inner cylindrical portion 22 b of the rotor 22, a rolling bearing 33 with both seals as a magnetic member is incorporated, and the rotor 22 and the electromagnet 23 are relatively rotated by the rolling bearing 33. It is supposed to be free.

  The rotation transmission device shown in the first embodiment has the above-described structure. FIG. 1 shows a state where the electromagnet 23 is de-energized with respect to the electromagnetic coil 23a, and the armature 21 is separated from the rotor 22 by the pressing of the separation spring 24. Is in a state. Further, as shown in FIG. 2 (I), the roller 8 is held at a neutral position where the engagement with the cylindrical surface 3 and the cam surface 5 is released.

  For this reason, even if rotational torque is input from the input shaft 10 to the inner ring 4, the rotation is not transmitted to the outer ring 2, and the inner ring 4 rotates freely.

  When the electromagnetic coil 23a is energized while the inner ring 4 is rotating, the magnetic flux a flows through the core 23b, the rotor 22 and the armature 21 as shown in FIG. 4, and an attractive force is applied to the armature 21. For this reason, the armature 21 moves to the rotor 22 side and is attracted to the rotor 22.

  At this time, since the frictional resistance acting on the attracting surfaces of the rotor 22 and the armature 21 becomes rotational resistance, the cage 6 and the inner ring 4 connected to the armature 21 rotate relative to each other. Due to the relative rotation, as shown in FIG. 2 (II), the roller 8 is engaged with the cylindrical surface 3 and the cam surface 5 and the two-way clutch 1 is engaged, and the inner ring 4 is rotated via the roller 8. It is transmitted to the outer ring 2.

  Here, when the inner ring 4 and the cage 6 rotate relative to each other, the switch spring 13 is elastically deformed. For this reason, when the energization to the electromagnetic coil 23a is cut off, the armature 21 is separated from the rotor 22, and the cage 6 is rotated by the restoring elasticity of the switch spring 13, so that the roller 8 is moved as shown in FIG. The cylinder surface 3 and the cam surface 5 are returned to the neutral position where they are disengaged.

  In the operation state of the rotation transmission device as described above, when the electromagnetic coil 23a is energized, as shown in FIG. 4, the rolling bearing 33 that supports the rotor 22 and the electromagnet 23 relatively rotatably is provided with a magnetic path. Since the magnetic flux a flows, a larger magnetic flux a can be formed as compared with the case where the air gap formed between the rotor and the electromagnet is used as a magnetic path.

  For this reason, even when the small electromagnet 23 is employed, the magnetic flux a large enough to attract the armature 21 to the rotor 22 can be formed, and the electromagnetic clutch 20 can be downsized. .

  Although omitted in FIG. 1, between the outer diameter surface of the core 23 b of the electromagnet 23 and the outer cylindrical portion 22 a of the rotor 22 and between the inner diameter surface of the core 23 b and the inner cylindrical portion 22 b of the rotor 22, the electromagnet 23 and the rotor 22. May be incorporated with a magnetic member that supports the two in a relatively rotatable manner.

  As described above, when a magnetic member is assembled between the core 23 and the rotor 22, the magnetic member serves as a magnetic path and magnetic flux flows, so that the attractive force with respect to the armature 21 can be further increased.

  5 and 6 show a second embodiment of the rotation transmission device according to the present invention. In this embodiment, a magnetic material such as a brush is provided between the outer diameter surface of the core 23 b that supports the electromagnetic coil 23 a of the electromagnet 23 and the outer cylindrical portion 22 a of the rotor 22 and between the inner diameter surface of the core 23 b and the inner cylindrical portion 22 b of the rotor 22. The member 34 is incorporated, and the electromagnet 23 and the rotor 22 are relatively rotatably supported.

  Further, a rolling bearing 35 made of a non-magnetic material is incorporated between the input shaft 10 and the electromagnet 23 so that the input shaft 10 and the electromagnet 23 are relatively rotatable. Since the other configuration is the same as that of the rotation transmission device shown in the first embodiment shown in FIG. 1, the same components are denoted by the same reference numerals, and the description thereof is omitted.

  As described above, by incorporating the magnetic member 34 between the rotor 22 and the core 23b of the electromagnet 23 so that the rotor 22 and the electromagnet 23 are relatively rotatable, the magnetic member 34 is energized when the electromagnetic coil 23a is energized. 6 becomes a magnetic path, and the magnetic flux a flows as shown in FIG. 6. Therefore, even when the small electromagnet 23 is employed, the magnetic flux a is large enough to attract the armature 21 to the rotor 22. Thus, the electromagnetic clutch 20 can be reduced in size.

  Further, by incorporating the rolling bearing 35 made of a non-magnetic material and relatively rotatably supporting the input shaft 10 and the electromagnet 23, it is possible to prevent the magnetic flux a from leaking to the input shaft 10, A decrease in the suction force with respect to the armature 21 can be suppressed.

  The rolling bearing 35 may be one in which each of the outer ring, the inner ring and the rolling element is made of a nonmagnetic material such as ceramics, or at least one of the outer ring, the inner ring and the rolling element is made of a nonmagnetic material. It may be what you did.

1 is a longitudinal front view showing a first embodiment of a rotation transmission device according to the present invention. (I) is a sectional view taken along line II-II in FIG. 1, (II) is a sectional view showing an engaged state of a two-way clutch Sectional view along line III-III in FIG. Sectional drawing which shows the adsorption | suction state of the armature of the electromagnetic clutch of FIG. Longitudinal front view showing a second embodiment of the rotation transmission device according to the present invention Sectional drawing which shows the adsorption state of the armature shown in FIG.

Explanation of symbols

1 Two-way clutch 2 Outer ring 3 Cylindrical surface 4 Inner ring 5 Cam surface 6 Cage 8 Roller (engagement element)
DESCRIPTION OF SYMBOLS 10 Input shaft 20 Electromagnetic clutch 21 Armature 22 Rotor 22a Outer cylindrical part 22b Inner cylindrical part 23 Electromagnet 23a Electromagnetic coil 23b Core 24 Separation spring 33 Rolling bearing (magnetic member)
34 Magnetic member 35 Rolling bearing

Claims (6)

An engaging element and a cage for holding the engaging element are incorporated between the inner circumference of the outer ring and the inner ring incorporated therein, and the engaging element is moved between the inner circumference of the outer ring and the inner ring by relative rotation of the cage and the inner ring. A two-way clutch that engages with the outer periphery and transmits rotational torque between the outer ring and the inner ring, and an electromagnetic that controls the engagement and disengagement of the engagement element by controlling the rotation of the cage of the two-way clutch An armature comprising a clutch, the electromagnetic clutch being prevented from rotating with respect to the cage and supported so as to be movable in the axial direction, and connected to the outer ring so as to face the armature in the axial direction; A rotor having a cylindrical portion formed thereon, a fixedly arranged electromagnet disposed between the inner and outer cylindrical portions of the rotor and opposed to the rotor in the axial direction, and a separation spring for biasing the armature in a direction away from the rotor. Possess In the rotation transmitting device comprising,
A rotation transmission device comprising a magnetic member for relatively rotatably supporting the electromagnet and the rotor between the core supporting the electromagnetic coil of the electromagnet and the inner cylindrical portion of the rotor.   The rotation transmission device according to claim 1, wherein the magnetic member is a rolling bearing.   The rotation transmission device according to claim 2, wherein the rolling bearing is a bearing with both seals.   A magnetic member for relatively rotatably supporting the electromagnet and the rotor between the outer diameter surface of the core supporting the electromagnetic coil of the electromagnet and the outer cylindrical portion of the rotor and between the inner diameter surface of the core and the inner cylindrical portion of the rotor. The rotation transmission device according to any one of claims 1 to 3, wherein the rotation transmission device is incorporated. An engaging element and a cage for holding the engaging element are incorporated between the inner circumference of the outer ring and the inner ring incorporated therein, and the engaging element is moved between the inner circumference of the outer ring and the inner ring by relative rotation of the cage and the inner ring. A two-way clutch that engages with the outer periphery and transmits rotational torque between the outer ring and the inner ring, and an electromagnetic that controls the engagement and disengagement of the engagement element by controlling the rotation of the cage of the two-way clutch An armature comprising a clutch, the electromagnetic clutch being prevented from rotating with respect to the cage and supported so as to be movable in the axial direction, and connected to the outer ring so as to face the armature in the axial direction; A rotor having a cylindrical portion formed thereon, a fixedly arranged electromagnet disposed between the inner and outer cylindrical portions of the rotor and opposed to the rotor in the axial direction, and a separation spring for biasing the armature in a direction away from the rotor. Possess In the rotation transmitting device comprising,
A magnetic member for relatively rotatably supporting the electromagnet and the rotor between the outer diameter surface of the core supporting the electromagnetic coil of the electromagnet and the outer cylindrical portion of the rotor and between the inner diameter surface of the core and the inner cylindrical portion of the rotor. Rotation transmission device characterized by incorporating   The rotation transmission device according to claim 5, wherein a rolling bearing made of a non-magnetic material is incorporated between the electromagnet and the input shaft connected to the inner ring.

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