JP2008144850A - Rotation transmitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation transmitting device capable of certainly controlling engagement and disengagement of a two-way clutch installed between an outer ring and an inner ring without being influenced by temperature variation. <P>SOLUTION: The two-way clutch 20 having a roller 23 and a retainer 24 for retaining the roller 23 is installed between the outer ring 10 and the inner ring 12, and a rotation control means 30 for controlling rotation of the retainer 24 is provided in parallel to the two-way clutch 20. The rotation control means 30 is formed by an armature 31 prevented from turning relative to the retainer 24; a pressing plate 32 arranged so as to be opposed to the armature 31; a plurality of solenoids 33 for moving the pressing plate 32 in a direction separating it from the armature 31; and an elastic member 34 for biasing the pressing plate 32 toward the armature 31. <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 a FR-based four-wheel drive vehicle, a two-way clutch is incorporated between the outer ring and the inner ring incorporated in the inner ring as a rotation transmission device for transmitting and interrupting the driving force to the front wheel as the auxiliary driving wheel. The electromagnetic clutch attached to the clutch controls the engagement and disengagement of the two-way clutch, the outer ring and the inner ring are coupled by the engagement of the two-way clutch, and torque is transmitted between the outer ring and the inner ring. What has been known is conventionally known.

  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. The armature is attracted to the rotor, and the roller is engaged with the cylindrical surface and the cam surface by the relative rotation of the cage and the inner ring coupled to the outer ring.

  In the rotation transmission device, the two-way clutch is engaged by energizing the electromagnetic coil of the electromagnet, and it is necessary to keep a relatively large current flowing through the electromagnetic coil in order to maintain the engaged state of the two-way clutch. There is a problem with the economy. If the electromagnetic coil is disconnected, the two-way clutch cannot be engaged, which may cause a safety problem.

  In order to eliminate such inconvenience, the applicant of the present invention in Patent Document 1 forms a slit in the rotor, incorporates a permanent magnet into the slit, holds the armature in an attracted state by the permanent magnet, and holds it with the inner ring. A rotation transmission device has been proposed in which a two-way clutch is engaged by relative rotation of a device, and an armature is separated from a rotor by energization of an electromagnetic coil to disengage the two-way clutch.

JP 2004-190730 A

  By the way, in the rotation transmission device described in Patent Document 1, the permanent magnet that attracts the armature to the rotor has a characteristic that the magnetic force is likely to change due to a change in temperature. May not be able to be switched to the engaged state, and there are still points to be improved in improving reliability.

  An object of the present invention is to provide a highly reliable rotation transmission device capable of reliably controlling the engagement and disengagement of a two-way clutch incorporated between an outer ring and an inner ring without being affected by a temperature change. Is to provide.

  In order to solve the above-described problems, in the present invention, an engaging element and a retainer that retains the engaging element are provided between opposing surfaces of the outer ring and the inner ring that is incorporated inside the outer ring, and rotation control of the retainer is performed. A two-way clutch that engages the inner ring with the inner ring of the outer ring and the outer ring of the inner ring to couple the two wheels is incorporated, and the elastic force of the switch spring is applied to the cage of the two-way clutch so In a rotation transmission device in which a cage is elastically held at a neutral position where the engagement is disengaged from the circumference and the outer circumference of the inner ring, and a rotation control means for controlling the rotation of the cage is provided on one side of the two-way clutch. The rotation control means is prevented from rotating by the retainer and is movable toward the end face of the outer ring, a pressing plate disposed opposite to the armature, a plunger connected to the pressing plate, and the plunger A plurality of direct acting solenoids that move the plunger in the axial direction by energizing the coil and move the plunger away from the armature, and urge the pressure plate toward the armature Thus, a configuration composed of an elastic member that presses the armature against the end face of the outer ring is adopted.

  In the rotation transmission device having the above-described configuration, the armature is pressed against the end face of the outer ring by the elastic force of the elastic member in a state where the energization of each coil of the plurality of solenoids is interrupted.

  For this reason, when the inner ring rotates, the frictional resistance acting on the contact portion between the outer ring and the armature becomes the rotational resistance of the armature, so that the inner ring and the cage rotate relative to each other. Due to the relative rotation, the switch spring is elastically deformed, and the engaging element is engaged with the inner periphery of the outer ring and the outer periphery of the inner ring, the two-way clutch is engaged, and the rotation of the inner ring is transferred to the outer ring through the engaging element. Communicated.

  In the state of transmission of rotational torque between the inner ring and the outer ring, when each coil of the plurality of solenoids is energized, the plunger moves backward, and the pressing plate separates from the armature against the elastic force of the elastic member. The release of the armature releases the armature, so that the retainer is rotated by the restoring elasticity of the switch spring to return to the neutral position where the engagement element is disengaged, and the rotation transmission from the inner ring to the outer ring is interrupted.

  Here, the elastic member that urges the pressing plate toward the armature may consist of a single coil spring arranged coaxially with the center of rotation of the inner ring, or outside the plunger of each solenoid. It may be composed of the same number of coil springs as the solenoids provided in.

  In the rotation transmission device according to the present invention, a plurality of solenoids are arranged at equal intervals on the same circle, and the plurality of solenoids are grouped into several groups so that adjacent solenoids are combined in different ways. By connecting the coils in series and connecting each series connected in parallel, one electric wire connected in parallel is cut and it becomes impossible to energize the coil of one set of solenoids. However, since the remaining solenoids can be energized, the two-way clutch can be switched to the disengagement direction, and the reliability can be further improved.

  In addition, if a thrust bearing is provided on the surface of the pressing plate facing the armature, the pressing plate and the armature can be smoothly rotated relative to each other when transmitting rotational torque from the inner ring to the outer ring, reducing torque loss. Can be planned.

  As described above, according to the present invention, the armature is pressed against the end face of the outer ring by the elastic force of the elastic member to engage the two-way clutch, and the armature is released by energizing each coil of the plurality of solenoids. Since the directional clutch is disengaged, the two-way clutch can be engaged even if it becomes impossible to energize the coils of the plurality of solenoids due to a failure in the electrical system.

  In addition, since the engagement and disengagement of the two-way clutch is due to the elastic force of the elastic member and the operation of a plurality of solenoids, the two-way clutch can be reliably controlled without being affected by temperature changes. A highly reliable 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, the interior of the housing 1 is partitioned into a first chamber 3 and a second chamber 4 by a partition plate 2, and an outer ring 10 is rotatably supported by a bearing 5 incorporated in the first chamber 3. ing.

  The outer ring 10 has a closed end, and an output shaft 11 is integrally provided at the closed end. An inner ring 12 is incorporated in the outer ring 10, and the inner ring 12 and the outer ring 10 are relatively rotatably supported by a bearing 13 incorporated in a closed end portion of the outer ring 10.

  An input shaft 14 is connected to the inner ring 12. The inner ring 12 has a large-diameter portion 12 a, and a two-way clutch 20 that couples and uncouples the inner ring 12 and the outer ring 10 is incorporated between the large-diameter portion 12 a and the opposed portion of the outer ring 10.

  As shown in FIGS. 1 and 4, the two-way clutch 20 forms a cylindrical surface 21 on the inner periphery of the outer ring 10, and the outer periphery of the large-diameter portion 12 a of the inner ring 12 is between the cylindrical surface 21 and the circumferential direction. A flat cam surface 22 that forms a narrow wedge-shaped space at both ends is provided in the circumferential direction, and a roller 23 as an engaging member is incorporated between each cam surface 22 and the cylindrical surface 21, and the roller 23 is held by a cage 24. is doing.

  A spring cylindrical portion 25 is formed on the end surface of the large-diameter portion 12 a of the inner ring 12, and a switch spring 26 is incorporated in the spring cylindrical portion 25. A part of the switch spring 26 is cut off in the circumferential direction, and a pair of pressing pieces 26 a provided outward from the cut-off end are provided at a notch portion 27 formed in the spring cylindrical portion 25 and an end portion of the cage 24. The side faces opposed to each other in the circumferential direction of the notch 27 and the notch 28 are pressed in opposite directions, and the rollers 23 are engaged with the cylindrical surface 21 and the cam surface 22 by the pressing. The cage 24 is elastically held at the neutral position to be released.

  As shown in FIG. 1, on one side in the axial direction at the open end of the outer ring 10, there is a rotation control means 30 that controls the engagement and disengagement of the roller 23 by the rotation control of the cage 24 of the two-way clutch 20. Is provided.

  The rotation control means 30 includes an armature 31 disposed opposite to the opening end surface of the outer ring 10, a pressing plate 32 facing the armature 31 in the axial direction, and a plurality of moving the pressing plate 32 in a direction away from the armature 31. It comprises a direct acting solenoid 33 and an elastic member 34 that urges the pressing plate 32 toward the armature 31.

  The armature 31 has a ring shape, and a guide cylinder 35 formed on the inner periphery of the armature 31 is fitted to the cylindrical portion 25 of the inner ring 12 and is slidably supported. Further, an engagement hole 36 is formed in the armature 31 at a position facing the end face of the retainer 24, and a projecting piece 37 provided on the end face of the retainer 24 is engaged with the engagement hole 36. Thus, the armature 31 is prevented from rotating with respect to the retainer 24 and is movable in the axial direction.

  The pressing plate 32 has a ring shape, and a thrust bearing 38 is provided on the surface facing the armature 31. Here, a thrust needle roller bearing using a needle roller as a rolling element is employed as the thrust bearing 38.

  As shown in FIG. 6, the solenoid 33 is provided around the solenoid body 39, a plunger 41 slidably inserted into a guide hole 40 formed in the central portion of the solenoid body 39, and the plunger 40. A coil 42 is provided, and the plunger 41 is moved in a direction in which the plunger 41 is drawn into the solenoid body 39 when the coil 42 is energized.

  As shown in FIGS. 1 and 2, each of the plurality of solenoids 33 is incorporated in the second chamber 4, arranged at equal intervals on the same circle with the input shaft 14 as the center, and fixed to the partition plate 2. Yes.

  Further, the tip portions of the plungers 41 of the plurality of solenoids 33 are connected to the pressing plate 32, and the pressing plates 32 are separated from the armature 31 by pulling the plungers 41 into the solenoid body 39 by energizing the coils 42 of the solenoids 33. 32 is moved.

  The elastic member 34 that urges the pressing plate 32 toward the armature 31 is a coil spring. This elastic member 34 is provided outside each plunger 41 of the plurality of solenoids 33. A coil spring having a large diameter may be adopted as the elastic member 34, and the coil spring may be arranged coaxially with the input shaft so as to bias the pressing plate 32 toward the armature 31.

  As shown in FIG. 8, the plurality of solenoids 33 are grouped into several groups so that adjacent solenoids 33 are misassembled. In the embodiment, twelve solenoids 33 are grouped into four groups as one set, and the coils 42 in each set of solenoids 33 are connected in series, and the sets connected in series are connected in parallel. Yes. In the figure, reference numeral 50 denotes an electric wire for connecting the coils 42 of the solenoids 33 of each group divided in series.

  The rotation transmission device shown in the embodiment has the above-described structure, and FIG. 7 shows a state where power to the coils 42 of the plurality of solenoids 33 is cut off. The armature 31 is pressed by the pressing force that the elastic member 34 presses the pressing plate 32. Is pressed against the open end face of the outer ring 10.

  When the inner ring 12 rotates from the state shown in FIG. 7, the frictional resistance between the armature 31 and the open end surface of the outer ring 10 becomes the rotational resistance of the cage 24, so that the inner ring 12 and the cage 24 rotate relative to each other. 5B, the roller 23 is engaged with the cylindrical surface 21 and the cam surface 22 and the two-way clutch 20 is engaged, and the inner ring 12 is rotated via the roller 23 due to the relative rotation. It is transmitted to the outer ring 10. The switch spring 26 is elastically deformed by the relative rotation of the inner ring 12 and the cage 24.

  When the outer ring 10 rotates together with the inner ring 12, the armature 31 also rotates together, and the armature 31 rotates relative to the pressing plate 32. At this time, since the thrust bearing 38 is incorporated between the opposing surfaces of the armature 31 and the pressing plate 32, the armature 31 and the pressing plate 32 rotate smoothly and the torque loss is small.

  When the two-way clutch 20 is disengaged, the coils 42 of the plurality of solenoids 33 are energized. Due to the energization, each plunger 41 of the plurality of solenoids 33 moves in a direction in which it is drawn into the solenoid body 39, so that the pressing plate 32 moves away from the armature 31, and the armature 31 of the armature 31 is moved as shown in FIG. Pressing is released.

  When the armature 31 is released, the retainer 24 is rotated by the restoring elasticity of the switch spring 26, and the roller 23 is disengaged from the cylindrical surface 21 and the cam surface 22 as shown in FIG. Returning to the neutral position, the two-way clutch 20 is disengaged, the rotation transmission from the inner ring 12 to the outer ring 10 is interrupted, and the inner ring 12 rotates freely.

  Here, the plurality of solenoids 33 for switching the two-way clutch 20 in the disengagement direction are grouped into several groups as shown in FIG. 8, and the coils 42 in the solenoids 33 of each group are connected in series, and the series Since each connected group is connected in parallel, even if one of the electric wires connected in parallel is cut and the coil 42 of one set of solenoids 33 cannot be energized, the remaining sets The solenoid 33 can be energized. For this reason, the two-way clutch 20 can be reliably switched to the disengaged state, and the reliability of the rotation transmission device is extremely high.

  In the rotation transmission device shown in the embodiment, the armature 31 is pressed against the end surface of the outer ring 10 by the elastic force of the elastic member 34 so that the two-way clutch 20 is engaged, and the armature is energized by energizing the coils 42 of the plurality of solenoids 33. Since the two-way clutch 20 is disengaged by releasing the pressure on the one-way clutch 31, even if the coils 42 of the plurality of solenoids 33 cannot be energized due to a failure in the electric system, the two-way clutch 20 is engaged. Can be combined.

  Further, since the engagement and disengagement of the two-way clutch 20 is due to the elastic force of the elastic member 34 and the operation of the plurality of solenoids 33, the two-way clutch 20 is reliably controlled without being affected by temperature changes. And a highly reliable rotation transmission device can be obtained.

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 III-III in FIG. Sectional view along line IV-IV in FIG. (A) is sectional drawing which shows the engagement release state of a two-way clutch, (b) is sectional drawing which shows the engagement state of a two-way clutch. Sectional drawing which shows the press release state of an armature Sectional view showing the pressed state of the armature Schematic diagram of the grouped solenoid coils connected in series

Explanation of symbols

10 outer ring 12 inner ring 20 two-way clutch 23 roller (engagement element)
24 Cage 26 Switch spring 30 Rotation control means 31 Armature 32 Press plate 33 Solenoid 34 Elastic member 38 Thrust bearing 41 Plunger 42 Coil

Claims (4)

An engaging element and a retainer for holding the engaging element are provided between opposing surfaces of the outer ring and the inner ring incorporated therein, and the engaging element is engaged with the inner periphery of the outer ring and the outer periphery of the inner ring by controlling the rotation of the retainer. A two-way clutch that combines the two wheels is assembled, and the elastic force of the switch spring is applied to the cage of the two-way clutch so that the engagement element is disengaged from the inner periphery of the outer ring and the outer periphery of the inner ring. In the rotation transmission device that elastically holds the cage in a neutral position and provided with a rotation control means for controlling the rotation of the cage on one side of the two-way clutch,
The rotation control means is prevented from rotating by the retainer and is movable toward the end face of the outer ring, a pressing plate disposed opposite to the armature, a plunger connected to the pressing plate, and the periphery of the plunger A plurality of direct acting solenoids that move the plunger in the axial direction by energizing the coil to move the pressing plate away from the armature, and urge the pressing plate toward the armature A rotation transmission device comprising an elastic member that presses against the end face of the outer ring.   The rotation transmission device according to claim 1, wherein the elastic member is provided outside a plunger of each solenoid.   The plurality of solenoids are arranged on the same circle, and the plurality of solenoids are grouped into several groups so that adjacent solenoids are in a different combination, and the coils in each set of solenoids are connected in series and connected in series. The rotation transmission device according to claim 1 or 2, wherein each set is connected in parallel.   The rotation transmission device according to any one of claims 1 to 3, wherein a thrust bearing is provided on a surface of the pressing plate facing the armature.

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