JP6451986B2 - Driving force transmission device - Google Patents

Description

  The present invention relates to a driving force transmission device capable of switching transmission / disconnection of a rotational driving force between a first shaft body and a second shaft body.

  The rotation transmission device described in Patent Document 1 below includes an electromagnetic clutch and a roller clutch as a two-way clutch. In this roller clutch, a pair of opposed rollers and a spring that urges the rollers away from each other are interposed in each of wedge spaces formed by the inner periphery of the outer ring and the outer periphery of the inner ring. The pair of rollers is supported by two holders, a control holder and a rotary holder. A ball cam structure is provided between the opposing surfaces of the flange of the control cage and the flange of the rotary cage so that the control cage and the rotary cage can be rotated relative to each other along with the axial movement of the control cage. . By moving the control cage in the axial direction by energization / power cutoff of the electromagnetic clutch, the control cage and the rotary cage rotate relative to each other. As a result, the pair of rollers is switched between an engaged state and a disengaged state with the inner periphery of the outer ring and the outer periphery of the inner ring.

JP 2013-92191 A

  However, in the rotation transmission device described in Patent Document 1, since the ball cam structure is integrated with the rotation cage, the shape of the rotation cage is complicated, which increases the cost. Further, since a high contact pressure (high hardness) is required for the sliding surface between the ball and the cam, a heat treatment or the like is required, which also causes an increase in cost. Although the cam can be formed using ceramics instead of the steel material, there is a risk that the cost increases with the adoption of ceramics. Therefore, it is desired to adopt a new structure replacing the ball cam structure as a mechanism for switching the engagement / release of the roller clutch.

  The inventors of the present application have studied to adopt a two-way clutch including first and second cages and a guide member that are rotatably provided as a two-way clutch included in the driving force transmission device. Yes. The guide member is in contact with the first cage from one side in the circumferential direction. The guide member contacts the second cage from the other side in the circumferential direction. As the guide member moves in one axial direction, the first cage rotates toward the other circumferential direction and the second cage rotates toward the other circumferential direction. By such rotation of the first and second cages, it is possible to move the roller pair disposed between the inner circumference of the outer ring and the outer circumference of the inner ring. It can be switched to the engaged state. The amount of rotation of the first and second cages accompanying the axial movement of the guide member is set to be equal to each other.

  However, for some reason, the first or second cage may have a rotation failure (a state where it does not rotate at all, or a state where it is difficult to rotate). If one of the cages rotates poorly, but the other cage rotates smoothly without any problem, the rotation of the guide member toward one side in the axial direction due to the driving of the electromagnetic clutch is poor. There is a possibility that the rotation of the cage in which no occurrence has occurred (in the above example, the first cage) rotates excessively beyond the intended rotation amount.

In order to drive both the roller clutches including the roller pair, it is necessary to rotate both the first and second cages satisfactorily. For this purpose, it is desirable not to allow excessive rotation of at least one of the first and second cages.
Therefore, an object of the present invention is to provide a driving force transmission device that can prevent at least one of the first and second cages from excessively rotating.

  In order to achieve the above object, the invention of claim 1 is characterized in that the outer periphery of the inner ring (4) connected coaxially to the first shaft body (2) and the second shaft body (3) are connected coaxially. And a pair of rollers (23) arranged in a circumferential direction (Y) in a wedge space (29) formed by an inner periphery of a cylindrical outer ring (5) provided to be relatively rotatable on the inner ring. A driving force transmission device (1) capable of switching transmission / disconnection of rotational driving force between the first shaft body and the second shaft body, the electromagnetic coil (73a) and the electromagnetic coil An electromagnetic clutch (7) having a rotor (72) disposed adjacent to the armature and an armature (71) coupled to the rotor when the electromagnetic coil is energized, and a first holding for holding the roller pair A container (31) and a second retainer for retaining the pair of rollers, A second retainer (32) provided in a relatively rotatable manner on the first retainer; and contacts the first retainer from one side in the circumferential direction (Y1) and the other in the circumferential direction on the second retainer In order to press and move the roller pair in a direction approaching each other as the guide member moves from one side to the other side (X1) in contact with the side of the guide member (X1), the first and second cages are A guide member (26) for guiding the first retainer to rotate toward the other circumferential direction and the second retainer to rotate toward the other circumferential direction, and is connected to the armature A guide member, a restriction protrusion (43, 44) provided on at least one of the first and second cages and extending from the cage toward one side in the axial direction, and the first And between the second cage and the armature, A holding plate (101) for holding an inner member, the holding plate (101) having an insertion recess through which the guide member and the restricting protrusion are inserted, and a holding plate that is rotatably provided along with the inner ring, The first and second cages are provided so as to be relatively rotatable with respect to the holding plate, and when the restricting protrusions engage with the circumferential ends (102b, 102a) of the insertion recesses, Provided is a driving force transmission device in which a rotation amount of the retainer provided with the regulating protrusion with respect to a holding plate is regulated.

The numbers in parentheses indicate corresponding components in the embodiments described later, but this does not mean that the present invention should be limited to those embodiments. The same applies hereinafter.
According to a second aspect of the present invention, the restriction protrusion includes a first restriction protrusion (43) provided on the first retainer and a second restriction provided on the second retainer. And the first and second restricting protrusions pass through the insertion recess in a state where the guide member is sandwiched in the circumferential direction, and the other circumferential direction of the insertion recess When the first restricting protrusion is engaged with the side end (102b), the amount of rotation of the first retainer with respect to the holding plate is restricted, and the circumferential one side end of the insertion recess ( The drive force transmission device according to claim 1, wherein the amount of rotation of the second cage with respect to the holding plate is regulated by the engagement of the second regulating projection with 102a).

  According to the configuration of the first aspect, the guide member and the restricting projection are inserted into the insertion recess of the holding plate. Since the first and second cages are provided on the holding plate so as to be relatively rotatable, they are provided on at least one of the first and second cages as the first and second cages rotate. The restricting protrusions that are rotated relative to the holding plate. And the amount of rotation of the retainer provided with the restriction protrusion is restricted by engaging the restriction protrusion inserted through the insertion recess with the circumferential end of the insertion recess. Therefore, when the first and second cages rotate as the guide member moves in the axial direction by driving the electromagnetic clutch, at least one of the first and second cages rotates excessively. Can be prevented.

  According to the structure of Claim 2, the said 1st and 2nd control protrusion has penetrated the said insertion recess in the state which pinched | interposed the said guide member in the circumferential direction. And the rotation amount of the 1st holder | retainer with respect to a holding | maintenance plate is controlled by engaging a 1st control protrusion in the circumferential direction other side edge part of an insertion recess. In addition, the amount of rotation of the second cage relative to the holding plate is regulated by engaging the second regulating projection with the one end portion in the circumferential direction of the insertion recess. Therefore, when the first and second cages rotate as the guide member moves in the axial direction by driving the electromagnetic clutch, the first cage rotates excessively, and the second cage Both can be prevented from rotating excessively.

FIG. 1 is a cross-sectional view of a driving force transmission device according to an embodiment of the present invention. FIG. 2 is a perspective view showing a configuration of a two-way clutch included in the driving force transmission device. FIG. 3 is an exploded perspective view showing the configuration of the two-way clutch. 4A and 4B are perspective views showing the configuration of the inner cage. FIG. 5 is a perspective view showing the configuration of the outer cage. FIG. 6 is a cross-sectional view of the configuration of the two-way clutch as viewed from the cutting plane line VI-VI in FIG. 7A and 7B are perspective views showing the configuration of the wedge member. FIG. 8 is an exploded perspective view of a part of the configuration of the two-way clutch. FIG. 9 is a side view showing a positional relationship between the wedge member, the inner cage and the outer cage when the two-way clutch is engaged. FIG. 10 is a front view showing a positional relationship between the wedge member, the inner cage and the outer cage in the engaged state of the two-way clutch. FIG. 11 is a cross-sectional view showing a configuration of the two-way clutch in a released state of the two-way clutch. FIG. 12 is a side view showing a positional relationship between the wedge member, the inner cage and the outer cage in the released state of the two-way clutch. FIG. 13 is a front view showing a positional relationship between the wedge member, the inner cage and the outer cage in the released state of the two-way clutch.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a driving force transmission device 1 according to an embodiment of the present invention. The driving force transmission device 1 is a device that can switch transmission / disconnection of rotational torque (rotational driving force) between a first shaft body 2 and a second shaft body 3 that are arranged coaxially with each other.
The driving force transmission apparatus 1 includes an inner ring 4 that is coaxially and integrally connected to a first shaft body 2 as an input shaft, and an outer ring 5 that is coaxially and integrally connected to a second shaft body 3 as an output shaft. , A two-way clutch 6 for transmitting / disconnecting a rotational driving force from the inner ring 4 to the outer ring 5, an electromagnetic clutch 7 for operating the fastening / release of the two-way clutch 6, an inner ring 4, an outer ring 5, a two-way clutch 6 and an electromagnetic And a housing 8 that houses the clutch 7.

  The driving force transmission device 1 is mounted on, for example, a steering device. Specifically, the driving force transmission device 1 is interposed between a steering shaft connected to a steering member such as a steering wheel and a turning shaft of a turning mechanism such as a rack and pinion. The steering device is provided with a steer-by-wire system that detects the operation angle of the steering member by an angle sensor and transmits the driving force of the steering motor controlled according to the sensor output to the steering shaft. ing. At normal times, the steer-by-wire system is activated, the two-way clutch 6 is released, and the transmission of rotational torque between the steering shaft and the steered shaft is cut off. In an emergency, the steer-by-wire system is temporarily disabled, and the two-way clutch 6 of the driving force transmission device 1 is engaged to transmit rotational torque between the steering shaft and the steered shaft. The

  In the following description, the axial direction of the rotation axis C of the first and second shaft bodies 2 and 3 is referred to as an axial direction X. The axial direction of the inner ring 4, the axial direction of the outer ring 5, the axial direction of the electromagnetic clutch 7, and the axial direction of the two-way clutch 6 coincide with the axial direction X. Further, in the axial direction X, the axial direction (right direction in FIG. 1) on the first shaft body 2 side when viewed from the two-way clutch 6 is one axial direction X1, and the axial direction X is viewed from the two-way clutch 6. The axial direction (left direction in FIG. 1) on the second shaft body 3 side is defined as the other axial direction X2.

The rotational radial direction of the first and second shaft bodies 2 and 3 is defined as a radial direction Z. The radial direction of the inner ring 4, the radial direction of the outer ring 5, and the radial direction of the two-way clutch 6 coincide with the radial direction Z.
A circumferential direction Y is defined as a circumferential direction of the first and second shaft bodies 2 and 3. The circumferential direction of the inner ring 4, the circumferential direction of the outer ring 5, the circumferential direction of the electromagnetic clutch 7, and the circumferential direction of the two-way clutch 6 coincide with the circumferential direction Y. Further, in the circumferential direction Y, the clockwise circumferential direction when viewed from the other axial direction X2 side is defined as one circumferential direction Y1, and among the circumferential directions Y, the counterclockwise circumferential direction as viewed from the other axial direction X2 side is circumferential. The other direction is Y2.

The housing 8 has a cylindrical shape, and a small-diameter bearing cylinder 9 is formed at the end portion on the other axial direction X2 side. The second shaft body 3 is supported so as to be rotatable and immovable in the axial direction X by a first rolling bearing 10 fixed to the inner periphery of the bearing cylinder 9.
The inner ring 4 is formed using, for example, a steel material, and integrally includes a shaft portion 11 and a large-diameter portion 12 provided in the middle portion of the shaft portion 11 in the axial direction X. FIG. 1 shows an example in which the inner ring 4 is provided integrally with the first shaft body 2 at the shaft end, but the inner ring 4 is provided as a separate member with respect to the first shaft body 2. The first shaft body 2 may be coupled so as to be able to rotate together.

The outer ring 5 has a cylindrical shape with a closed end on the other axial side X2 side, and is formed using a steel material. The second shaft body 3 is connected to the closed end of the outer ring 5. 1 shows an example in which the closed end of the outer ring 5 is provided integrally with the second shaft body 3, but the outer ring 5 is provided as a separate member from the second shaft body 3, and the inner ring 4 and the second You may connect with the shaft body 3 so that accompanying rotation is possible.
A first annular step 13 and a second annular step 14 having a larger diameter than the first annular step 13 are formed on the inner circumference of the outer ring 5 in this order from the end on the other axial X2 side. Has been. The inner ring 4 is supported rotatably and immovably in the axial direction X by a second rolling bearing 15 fixed to the inner periphery of the first annular step portion 13.

The two-way clutch 6 is disposed between the inner ring 4 and the outer ring 5. That is, the two-way clutch 6 can switch between transmission / disconnection of rotational torque between the inner ring 4 and the outer ring 5.
FIG. 2 is a perspective view showing the configuration of the two-way clutch 6. FIG. 3 is an exploded perspective view showing the configuration of the two-way clutch 6. 4A and 4B are perspective views showing the configuration of the inner cage 31. FIG. 4A and 4B, the inner cage 31 is viewed from two different directions. FIG. 5 is a perspective view showing the configuration of the outer cage 32. 6 is a cross-sectional view of the configuration of the two-way clutch 6 as seen from the cutting plane line VI-VI in FIG.

The configuration of the two-way clutch 6 will be described below with reference to FIGS. 2 and 3, the large-diameter portion 12 is mainly illustrated in the inner ring 4. 2, 3, and 6, the outer ring 5 is not shown. FIG. 6 shows the engaged state of the two-way clutch 6.
The two-way clutch 6 is provided on the cylindrical surface 21 provided on the inner periphery of the second annular step portion 14 of the outer ring 5 and the outer periphery of the large-diameter portion 12 of the inner ring 4 so as to be arranged at equal intervals in the circumferential direction Y. A plurality of (for example, three) cam surfaces 22, a plurality of (for example, three) roller pairs 23, a plurality (the same number as the number of roller pairs 23) of elastic members 24, and the roller pairs 23 and the elastic members 24 are held. A cage 25, a plurality of (same as the number of roller pairs 23) synthetic resin wedge members (guide members) 26 connected to the armature 71 of the electromagnetic clutch 7 so as to be movable in the axial direction X, and the cage 25. And a back plate (holding plate) 101 for holding the wedge member 26.

The cam surfaces 22 are arranged at equal intervals in the circumferential direction Y on the outer periphery of the inner ring 4. A plurality of cam surfaces 22 may be provided on the inner periphery of the outer ring 5, and a cylindrical surface may be provided on the outer periphery of the inner ring 4.
As shown in FIG. 6, the cylindrical surface 21 of the outer ring 5 and the cam surfaces 22 of the inner ring 4 face each other in the radial direction Z. Each cam surface 22 is provided with a pair of inclined surfaces 27a and 27b provided to incline in opposite directions with respect to the circumferential direction Y, and a tangential direction of the inner ring 4 provided between the pair of inclined surfaces 27a and 27b. And a flat spring support surface 28. A wedge space 29 is formed between each cam surface 22 and the cylindrical surface 21. Each wedge space 29 becomes narrower toward both ends in the circumferential direction Y.

  As shown in FIG. 6, each roller pair 23 includes a first roller 23a disposed on the one circumferential side Y1 side and a second roller 23b disposed on the other circumferential side Y2 side. In each wedge space 29, a first roller 23a and a second roller 23b are arranged so as to face each other. In each wedge space 29, an elastic member 24 that elastically presses the first and second rollers 23a and 23b in the circumferential direction Y away from each other is disposed.

  An example of the elastic member 24 is a compression coil spring. Further, as the elastic member 24, other types of springs such as a leaf spring or a rubber material can be used. One end 24a of each elastic member 24 elastically presses the corresponding first roller 23a toward one circumferential direction Y1, and the other end 24b of each elastic member 24 presses the corresponding second roller 23b to the other circumferential direction. It is elastically pressed toward the Y2 side. The elastic member 24 is supported by the spring support surface 28. As shown in FIG. 3, the plurality of elastic members 24 are attached to the outer periphery of the inner ring 4 by fitting an elastic member holder 30 that collectively supports the elastic members 24 to the inner ring 4. May be.

As shown in FIGS. 2 and 3, the retainer 25 includes an inner retainer (first retainer) 31 and an outer retainer (second retainer) 32 provided as separate members. The inner cage 31 and the outer cage 32 are provided so as to be rotatable relative to each other.
As shown in FIGS. 4A and 4B, the inner retainer 31 includes a thin disk-shaped first annular portion 33 and an annular shape that is coaxially and axially disposed on the one X1 side with respect to the first annular portion 33. The third annular portion 34, and a plurality of (the same number of roller pairs 23) connecting portions 35 that connect the first annular portion 33 and the third annular portion 34 are included. The first and third annular portions 33 and 34 (that is, the inner cage 31) are fitted on the outer periphery of the large-diameter portion 12 of the inner ring 4 so as to be rotatable relative to the inner ring 4. The first annular portion 33 is provided so as to contact the large diameter portion 12 from the other axial direction X2 side. The inner cage 31 is externally fitted to the inner ring 4 at a plurality of locations in the axial direction X.

  As shown in FIGS. 4A and 4B, the number of connection portions 35 is the same as the number of roller pairs 23 (three in this embodiment), and is arranged at equal intervals in the circumferential direction Y. The first annular portion 33, the third annular portion 34, and the plurality of connecting portions 35 are integrally formed using a synthetic resin material (for example, polyacetal, polyamide, polytetrafluoroethylene, polyetheretherketone, polyphenylene sulfide, etc.). Is formed.

  Each connection portion 35 has a columnar shape extending along the axial direction X. A first contact surface 37 (refer mainly to FIG. 6) that can contact (press) the first roller 23a of the pair of rollers 23 is formed on the surface of each connection portion 35 on the other Y2 side in the circumferential direction. . Each connection portion 35 includes a first protrusion 36 (having a first contact surface 37) that protrudes from the outer periphery of the first annular portion 33 toward the one axial direction X 1, and the first protrusion 36. A first regulating protrusion 43 provided at the end of one axial direction X1 is integrally included. In other words, the first annular portion 33 is provided with the same number of first restricting protrusions 43 as the number of wedge members 26 (three in this embodiment).

The first contact surface 37 is constituted by, for example, a flat surface. That is, the first contact surface 37 can come into surface contact with the first roller 23a. However, the first contact surface 37 is not limited to the surface contact with the first roller 23a, and may be in a line contact or point contact with the first roller 23a.
The length of the first restricting protrusion 43 in the axial direction X is set to be approximately the same as the thickness of the back plate 101. In other words, as shown in FIGS. 4A and 4B, each first restricting protrusion 43 is disposed (provided) on the outer periphery of the third annular portion 34. The outer periphery of each first protrusion 36 and the outer periphery of each first restriction protrusion 43 form the same cylindrical surface.

  A first slidable contact surface 38 (refer mainly to FIGS. 3 and 6) that slidably contacts the corresponding wedge member 26 is formed on the surface on the Y1 side in the circumferential direction of each first protrusion 36. The first slidable contact surface 38 is configured by an inclined surface that goes to one circumferential direction Y1 as it goes to one axial direction X1. In this embodiment, the 1st to-be-slidable contact surface 38 is comprised by the concave curved surface which makes circular arc shape or elliptical arc shape. This concavely curved surface is concavely curved with respect to the axial direction X with a smaller curvature than the first sliding contact surface 53 made of a convexly curved surface. Moreover, the 1st to-be-slidable contact surface 38 may comprise the shape which combined the concave curved surface and the flat surface (inclined surface), and may be formed of the flat surface (inclined surface).

  The outer cage 32 has an annular second annular portion 39 and a plurality of second protrusions 40 that protrude from the inner circumference of the second annular portion 39 toward the other axial direction X2. . The second annular portion 39 is fitted on the outer periphery of the outer ring 5 so as to be rotatable relative to the outer ring 5. The second annular portion 39 is disposed so as to surround the outer periphery of the third annular portion 34. The same number of second protrusions 40 as the number of roller pairs 23 (three in this embodiment) are provided, and are arranged at equal intervals in the circumferential direction Y. The second annular portion 39 and the plurality of second protrusions 40 are integrally formed using a synthetic resin material (for example, polyacetal, polyamide, polytetrafluoroethylene, polyetheretherketone, polyphenylene sulfide, etc.). Yes.

  A recess 80 that is recessed outward in the radial direction Z is formed along the axial direction X on the inner periphery of the second annular portion 39. The number of recesses 80 corresponds to each second protrusion 40 on a one-to-one basis, and is provided in the same number (for example, three) as the number of second protrusions 40. Each recess 80 is formed in a region adjacent to the other circumferential direction other Y2 side of the corresponding second protrusion 40 in the second annular portion 39. Each recessed part 80 is a recessed part for the insertion part 51 of the wedge member 26 and the 1st control protrusion 43 of the inner side holder | retainer 31 to penetrate.

As shown in FIG. 3 and FIG. 5, each concave portion 80 is provided long in the circumferential direction Y, and the side surface 81 on the other circumferential side Y2 side is engaged with the first regulating protrusion 43 to The relative rotation amount between the cage 31 and the outer cage 32 may be regulated.
A second abutment surface 41 (mainly see FIG. 6) capable of abutting (pressing) the second roller 23b of the roller pair 23 is formed on the surface on the Y1 side in the circumferential direction of each second protrusion 40. Has been. The second contact surface 41 is constituted by, for example, a flat surface. That is, the second contact surface 41 can come into surface contact with the second roller 23b. However, the second contact surface 41 is not limited to the surface contact with the second roller 23b, and may be in a line contact or point contact with the second roller 23b.

  A second slidable contact surface 42 (mainly see FIGS. 3 and 6) is formed on the surface of the second protrusion 40 on the other circumferential side Y2 side so as to slidably contact the corresponding wedge member 26. The second slidable contact surface 42 is configured by an inclined surface that goes to the other circumferential direction Y2 as it goes to the one axial direction X1. In this embodiment, the second slidable contact surface 42 is constituted by a concave curved surface having an arc shape or an elliptical arc shape. This concavely curved surface is concavely curved with respect to the axial direction X with a smaller curvature than the second sliding contact surface 54 made of a convexly curved surface. Further, the second slidable contact surface 42 may be formed by combining a concave curved surface and a flat surface (inclined surface), or may be formed by a flat surface (inclined surface).

  As shown in FIG. 5, the second annular portion 39 has the same number of columnar second restricting protrusions 44 protruding toward the one side X1 in the axial direction as the number of wedge members 26 (3 in this embodiment). One) is provided. Each of the second restricting protrusions 44 is provided integrally with the second annular portion 39 at the same position as the second protrusion 40 (that is, the inner peripheral portion of the second annular portion 39). The length of the second restricting protrusion 44 in the axial direction X is set to be approximately the same as the thickness of the back plate 101. In other words, as shown in FIG. 5, each second restricting protrusion 44 is disposed (provided) on the inner periphery of the second annular portion 39. Moreover, the outer periphery of each 2nd protrusion 40 and the outer periphery of each 2nd control protrusion 44 make the same cylindrical surface.

  As shown in FIG. 2, the inner cage 31 and the outer cage 32 are combined such that a plurality of connection portions 35 and a plurality of second protrusions 40 are alternately arranged in the circumferential direction Y. On the other circumferential side Y2 side of each connecting portion 35, a second protrusion 40 that can press the second roller 23b that makes a pair with the first roller 23a that can be pressed by the connecting portion 35 is a roller pair 23. Next to each other. In addition, on the one Y1 side in the circumferential direction of each connecting portion 35, the second roller pair 23 adjacent on the one Y1 side in the circumferential direction of the roller pair 23 including the first roller 23a that can press the connecting portion 35 is included. The second protrusions 40 (hereinafter referred to as “second protrusions 40 of the adjacent roller pair 23”) that can be pressed against the roller 23b are adjacent to each other via the wedge member 26. That is, with respect to the inner cage 31 and the outer cage 32, the connecting portion 35 that can press the first roller 23a of each roller pair 23, and the roller pair 23 adjacent to the roller pair 23 in the circumferential direction one Y1 side. The second protrusions 40 capable of pressing the two rollers 23 b are adjacent to each other via one wedge member 26. Since the first restriction protrusion 43 is provided in the connection part 35 and the second restriction protrusion 44 is disposed at the same position as the second protrusion 40 in the second annular part 39, the first restriction protrusion 43 is provided. The restricting protrusion 43 and the second restricting protrusion 44 are in a state of sandwiching the wedge member 26 in the circumferential direction Y.

  As shown in FIGS. 2 and 3, each of the rollers 23 a and 23 b is moved toward the X1 side in the axial direction by both the third annular portion 34 of the inner retainer 31 and the second annular portion 39 of the outer retainer 32. Movement (ie, omission) is restricted. Further, the movement of each roller 23a, 23b toward the other X2 side in the axial direction (that is, removal) is restricted by the first annular portion 33 of the inner cage 31. In addition, the movement of each roller 23a, 23b toward the one X1 side in the axial direction may be restricted by only one of the third annular portion 34 and the second annular portion 39.

A corresponding wedge member 26 is inserted between each connecting portion 35 and the second protrusion 40 of the adjacent roller pair 23.
7A and 7B are perspective views showing the configuration of the wedge member 26. FIG. 7A and 7B, the wedge member 26 is viewed from two different directions.
Each wedge member 26 includes an insertion portion 51 inserted between the connection portion 35 (see FIG. 2 and the like) and the second protrusion 40 (see FIG. 2 and the like) of the adjacent roller pair 23, and a shaft of the insertion portion 51. And a wedge portion 52 that extends in the circumferential direction Y from the other end in the direction X. The insertion part 51 extends in a rod shape along the axial direction X, and the shape of the cross section perpendicular to the axis is rectangular. The wedge portion 52 includes a first sliding contact surface 53 provided on the surface on the other circumferential side Y2 side and a second sliding contact surface 54 provided on the surface on the one circumferential side Y1 side.

The first slidable contact surface 53 is configured by an inclined surface that goes to one circumferential direction Y1 as it goes to one axial direction X1. In this embodiment, the first slidable contact surface 53 is configured by a spherical or substantially spherical convex curved surface.
The second slidable contact surface 54 is configured by an inclined surface that goes to the other circumferential direction Y2 as it goes to one axial direction X1. In this embodiment, the second slidable contact surface 54 is configured by a spherical or substantially spherical convex curved surface.

Further, the first and second sliding contact surfaces 53 and 54 may be formed by flat surfaces (inclined surfaces).
As shown in FIG. 1, the electromagnetic clutch 7 includes an annular armature 71 to which a plurality of wedge members 26 are fixedly connected, an annular rotor 72 that faces the armature 71 in the axial direction on the X1 side, and an axial direction of the rotor 72. On the other hand, an electromagnet 73 disposed on the X1 side is included.

  The armature 71 is disposed on the X1 side in the axial direction via the back plate 101 with respect to the third annular portion 34 of the inner cage 31 and the second annular portion 39 of the outer cage 32. The armature 71 is provided so as to be rotatable and movable in the axial direction X with respect to the housing 8 and the inner ring 4. The rotor 72 is externally fitted and fixed to the outer periphery of the inner ring 4. The electromagnet 73 includes an electromagnetic coil 73a and a core 73b that supports the electromagnetic coil 73a. The outer periphery of the core 73b is fitted and fixed to the housing 8. The inner periphery of the core 73 b is supported by a third rolling bearing 74 that is externally fitted and fixed to the inner ring 4 so as to be relatively rotatable with respect to the inner ring 4 and not relatively movable in the axial direction X. By the third rolling bearing 74, the electromagnet 73 and the first shaft body 2 are relatively rotatable.

FIG. 8 is an exploded perspective view of a part of the configuration of the two-way clutch 6 (a configuration including the inner cage 31, the outer cage 32, the back plate 101, and the wedge member 26).
As shown in FIGS. 1 and 8, the back plate 101 has an annular plate shape, and is externally fixed to the shaft portion 11 of the inner ring 4. The back plate 101 is formed using, for example, a steel material. The main surface 101A on the other axial side X2 side of the back plate 101 is in sliding contact with the principal surface on the other axial side X1 side of the third annular portion 34 and the second annular portion 39, respectively. A plurality of insertion recesses 102 (the same number as the number of wedge members 26) are provided in the back plate 101 at equal intervals in the circumferential direction Y. Each insertion recess 102 is provided on the wedge member 26 in a one-to-one correspondence. Each wedge member 26 is connected and fixed to the armature 71 through the corresponding insertion recess 102.

  In this embodiment, each insertion recess 102 is an insertion hole that penetrates the back plate 101 in the axial direction X. Each insertion recess 102 is a circumferential hole extending along the circumferential direction Y and has a sector shape when viewed from the axial direction X. Each insertion recess 102 has a side surface (one end portion in the circumferential direction) 102a formed of a flat surface on the Y1 side in the circumferential direction. Further, each insertion recess 102 has a side surface (circumferential other side end) 102b formed of a flat surface on the other circumferential Y2 side.

  The length of each insertion recess 102 in the circumferential direction Y is set such that the first restriction protrusion 43, the second restriction protrusion 44, and the insertion part 51 of the wedge member 26 can be inserted together. Yes. In each insertion recess 102, the first restriction protrusion 43 and the second restriction protrusion 44 with the first restriction protrusion 43 and the second restriction protrusion 44 sandwiching the insertion portion 51 in the circumferential direction Y. The part 44 and the insertion part 51 are inserted.

  FIG. 9 is a side view showing the positional relationship between the wedge member 26, the inner cage 31 and the outer cage 32 in the engaged state of the two-way clutch 6. FIG. 10 is a front view showing the positional relationship between the wedge member 26, the inner cage 31 and the outer cage 32 in the engaged state of the two-way clutch 6. FIG. 11 is a cross-sectional view showing the configuration of the two-way clutch 6 when the two-way clutch 6 is released. FIG. 12 is a side view showing the positional relationship between the wedge member 26 and the inner and outer cages 31 and 32 when the two-way clutch 6 is released. FIG. 13 is a front view showing a positional relationship between the wedge member 26 and the inner cage 31 and the outer cage 32 in the released state of the two-way clutch 6. 10 and 13, each is viewed from one axial direction X1 side.

  As the inner ring 4 rotates, the back plate 101 that is externally fitted and fixed to the inner ring 4 rotates. Since the first restriction protrusion 43, the second restriction protrusion 44, and the insertion part 51 of the wedge member 26 are inserted (that is, engaged) into the insertion recess 102 of the back plate 101, the back As the plate 101 rotates, the inner cage 31, the outer cage 32, and each wedge member 26 rotate.

  As shown in FIGS. 6 and 9, when the electromagnetic clutch 7 is in the OFF state, the two-way clutch 6 is in the engaged state, and the armature 71 is not attracted by the electromagnet 73. Therefore, the armature 71 is located at the initial position, and the wedge member 26 provided on the armature 71 so as to be movable in the axial direction X is disposed at the first position (initial position, the position of the wedge member 26 shown in FIG. 9). Yes.

  In this state, as shown in FIG. 6, each first roller 23 a is moved by the elastic member 24 toward the first engagement position 29 a provided at the end of the wedge space 29 on the one circumferential side Y1 side. It is elastically pressed. When the first roller 23a is in the first engagement position 29a, the first roller 23a is engaged with the outer periphery of the inner ring 4 (large diameter portion 12) and the inner periphery of the outer ring 5 (second annular step portion 14). Match. Further, in this state, each second roller 23 b is elastically pressed by the elastic member 24 toward the second engagement position 29 b provided at the end portion on the other circumferential side Y <b> 2 side of the wedge space 29. When the second roller 23b is in the second engagement position 29b, the second roller 23b is placed on the outer periphery of the inner ring 4 (large diameter portion 12) and the outer periphery of the outer ring 5 (second annular step portion 14). Engage. Thus, in the off state of the electromagnetic clutch 7, the first and second rollers 23a, 23b are engaged with the outer periphery of the inner ring 4 and the inner periphery of the outer ring 5, so that the two-way clutch 6 is engaged. become.

  On the other hand, when the electromagnetic clutch 7 is switched on, as shown in FIG. 12, the armature 71 is attracted by the electromagnetic clutch 7, so that the plurality of wedge members 26 connected to the armature 71 are moved to the X1 side in the axial direction. Pulled in (moves in the axial direction X). As a result of this drawing, the wedge member 26 is moved to the second position (drawing position; position of the wedge member 26 shown in FIG. 12) on the one side X1 in the axial direction from the first position (position of the wedge member 26 shown in FIG. 9). Placed in.

Since the first slidable contact surface 53 provided on the surface on the other circumferential side Y2 side of the wedge member 26 is composed of a surface directed toward the circumferential direction one Y1 toward the axial direction one X1, one axial direction X1 of each wedge member 26. With the movement to the side, the first slidable contact surface 53 is slidably contacted with the first slidable contact surface 38 of the connecting portion 35, and the connecting portion 35 is guided to the other circumferential direction Y2.
In addition, since the second sliding contact surface 54 provided on the surface on the one Y1 side in the circumferential direction of the wedge member 26 is a surface that faces the other Y2 in the circumferential direction as it goes to the one axial direction X1, the axial direction of each wedge member 26 On the other hand, with the movement toward the X1 side, the second slidable contact surface 54 slides on the second slidable contact surface 42 of the second projecting portion 40 of the adjacent roller pair 23, and the second projecting portion 40 is moved. Guide to the Y1 side in the circumferential direction.

  That is, as each wedge member 26 moves toward the one side X1 in the axial direction, the connection portion 35 and the second protrusion 40 of the adjacent roller pair 23 are separated from the wedge member 26 (insertion portion 51), As a result, the inner cage 31 rotates with respect to the wedge member 26 toward the other circumferential direction Y2, and the outer cage 32 rotates with respect to the wedge member 26 toward the circumferential direction one Y1 side. When the inner retainer 31 and the outer retainer 32 rotate with respect to the back plate 101, the third annular portion 34 of the inner retainer 31 and the second annular portion of the outer retainer 32 are associated with them. 39 slide on the main surface 101A of the back plate 101, respectively.

  As the inner retainer 31 rotates relative to the wedge member 26 toward the other Y2 side in the circumferential direction, each first contact surface 37 moves toward the other Y2 side in the circumferential direction, and as a result, the corresponding first roller 23a. And the first roller 23a is pressed toward the other circumferential direction Y2. Accordingly, each first roller 23a is moved toward the other circumferential direction Y2 against the elastic pressing force of the elastic member 24. As a result, each first roller 23a is disengaged from the first engagement position 29a (see FIG. 6), and a gap is formed between each first roller 23a and the inner periphery of the outer ring 5, as shown in FIG. S1 is formed. As a result, each first roller 23 a is disengaged from the outer periphery of the inner ring 4 and the inner periphery of the outer ring 5.

  In addition, as the outer cage 32 rotates toward the one Y1 side in the circumferential direction with respect to the wedge member 26, each second contact surface 41 moves toward the one Y1 side in the circumferential direction, and as a result, the corresponding second It comes into contact with the roller 23b and presses the second roller 23b toward the circumferential direction one Y1. Accordingly, the second roller 23b is moved toward one circumferential direction Y1 against the elastic pressing force of the elastic member 24. As a result, each second roller 23b is disengaged from the second engagement position 29b (see FIG. 6), and a gap is formed between each second roller 23b and the inner periphery of the outer ring 5, as shown in FIG. S2 is formed. As a result, each second roller 23 b is disengaged from the outer periphery of the inner ring 4 and the inner periphery of the outer ring 5.

In this way, when the electromagnetic clutch 7 is in the on state, the rollers 23a and 23b are disengaged from the outer periphery of the inner ring 4 (large diameter portion 12) and the inner periphery of the outer ring 5, whereby the two-way clutch 6 is released. Become.
In the two-way clutch 6, the specifications of the first and second sliding contact surfaces 53, 54 are common, and the specifications of the first and second sliding contact surfaces 38, 42 are common. Therefore, the amount of rotation of the inner cage 31 and the amount of rotation of the outer cage 32 accompanying the movement of the wedge member 26 toward the one axial direction X1 are equal to each other.

However, there is a case in which one of the inner cage 31 and the outer cage 32 (for example, the inner cage 31) has a rotation failure (a state in which it does not rotate or is difficult to rotate).
In this case, when the wedge member 26 moves toward the one axial direction X1 by driving the electromagnetic clutch 7, the inner cage 31 does not move (is difficult to do), so the second sliding contact surface 54 (see FIG. 9 and the like). ) And the second slidable contact surface 42 (see FIG. 9, etc.), the wedge member 26 itself may move toward the other circumferential direction Y2.

  In this embodiment, the first and second restricting protrusions 43 and 44 pass through the insertion recess 102 with the insertion part 51 of the wedge member 26 sandwiched in the circumferential direction Y. Since the inner retainer 31 and the outer retainer 32 are provided on the back plate 101 so as to be relatively rotatable, the first and second restricting protrusions 43 are rotated as the inner retainer 31 and the outer retainer 32 rotate. , 44 rotate relative to the back plate 101, respectively.

Further, when the first regulating protrusion 43 is engaged with the side surface 102b on the other circumferential side Y2 side of the insertion recess 102, the inner retainer 31 is further rotated to the circumferential direction other side Y2 with respect to the back plate 101. Is regulated. That is, the amount of rotation of the inner cage 31 relative to the back plate 101 is regulated by the engagement between the first regulating protrusion 43 and the side surface 102b.
Further, when the second restricting protrusion 44 is engaged with the side surface 102a on the Y1 side in the circumferential direction of the insertion recess 102, further rotation of the outer cage 32 relative to the back plate 101 in the circumferential direction Y1 is further performed. Is regulated. That is, the amount of rotation of the outer cage 32 relative to the back plate 101 is regulated by the engagement between the second regulating protrusion 44 and the side surface 102a.

As a result, when the inner cage 31 and the outer cage 32 rotate as the wedge member 26 moves in the axial direction X by driving the electromagnetic clutch 7, the inner cage 31 rotates excessively, and the outer It is possible to prevent both of the cage 32 from rotating excessively.
Accordingly, when the rotation failure of the inner cage 31 occurs, the outer cage 32 can be prevented from rotating excessively, and the reaction force causes the inner cage 31 to rotate relative to the other circumferential direction Y2. A force to be moved can be applied to the inner cage 31. In addition, when the outer cage 32 has a rotation failure, the inner cage 31 can be prevented from rotating excessively, and the reaction force causes the outer cage 32 to rotate with respect to one circumferential direction Y1. A force to be moved can be applied to the outer cage 32. Thereby, both the retainers 31 and 32 can be rotated favorably, and both of the roller clutches including the roller pair 23 can be satisfactorily released.

  Further, the engagement between the first restricting protrusion 43 and the second restricting protrusion 44 provided in the inner retainer 31 and the outer retainer 32 and the insertion recess 102 formed in the back plate 101 causes the inner Since the restriction of excessive rotation of the retainer 31 and the outer retainer 32 is realized, the number of parts can be reduced as compared with the case where other members are provided to restrict excessive rotation, thus reducing the cost. Can be achieved.

In addition, since the first restriction protrusion 43 is provided in the connection portion 35, the inner retainer 31 can be downsized as compared with the case where the first restriction protrusion 43 is provided separately from the connection portion 35. .
As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.
For example, in the above-described embodiment, each insertion recess 102 has been described as an insertion hole. However, each insertion recess 102 may be provided in the form of a groove connected to the inner periphery or outer periphery of the back plate 101. .

Further, the first restricting protrusion 43 is described as being provided on the connecting portion 35, but the first restricting protrusion 43 may be provided on a portion other than the connecting portion 35 of the inner cage 31. In addition, the second restricting protrusion 44 has been described as being provided at the same position as the second protrusion 40, but the second restricting protrusion 44 is provided at a position different from the second protrusion 40. It may be done.
Further, the configuration in which the first restriction protrusion 43 is provided in the inner cage 31 and the second restriction protrusion 44 is provided in the outer cage 32 has been described, but only one of the inner cage 31 and the outer cage 32 has been described. It is good also as a structure which provides the control protrusions 43 and 44 in this.

Moreover, although the inner side retainer 31 was demonstrated as the structure containing the 1st cyclic | annular part 33 and the 3rd cyclic | annular part 34, it is also possible to abolish the 3rd cyclic | annular part 34, for example. Further, the shape of the first annular portion 33 is not limited to an annular shape, and may be another annular shape.
Further, the shape of the second annular portion 39 of the outer cage 32 is not limited to an annular shape, and may be another annular shape.

  In the above-described embodiment, the first sliding contact surface 53 that is in sliding contact with the connection portion 35 corresponding to the first roller 23 a and the second protrusion 40 corresponding to the second roller 23 b of the adjacent roller pair 23 are used. Although the wedge member 26 having both the second sliding contact surface 54 and the second sliding contact surface 54 is provided and the function of the guide member is exhibited by the plurality of wedge members 26, the first sliding contact surface 53 is provided. The guide member (first guide member) and the guide member (second guide member) having the second sliding contact surface 54 may be provided as separate members. In this case, the number of first and second guide members required is the same as the number of roller pairs, and the total number of first and second guide members is twice the number of roller pairs (for example, six). is necessary.

The present invention can be applied not only to a driving force transmission device mounted on a steering device, but also to other driving force transmission mechanisms (for example, a driving force transmission mechanism for switching between two-wheel driving and four-wheel driving). is there.
In addition, the present invention can be variously modified within the scope of the claims.

DESCRIPTION OF SYMBOLS 1 ... Driving force transmission device, 2 ... 1st shaft body, 3 ... 2nd shaft body, 4 ... Inner ring, 5 ... Outer ring, 7 ... Electromagnetic clutch, 23 ... Roller pair, 26 ... Wedge member (guide member), 29 ... Wedge space, 31 ... Inner retainer (first retainer), 32 ... Outer retainer (second retainer), 43 ... Second restricting protrusion, 44 ... Second restricting protrusion, 71 ... Armature, 72 ... Rotor, 73a ... Electromagnetic coil, 101 ... Back plate (holding plate), 102a ... Side surface on the Y1 side in the circumferential direction (circumferential one end), 102b ... Side surface on the other Y2 side in the circumferential direction (circumference) X1 ... axial direction one side, Y ... circumferential direction, Y1 ... circumferential direction one side, Y2 ... circumferential direction other side

Claims (2)

A wedge formed by an outer periphery of an inner ring that is coaxially connected to the first shaft body and an inner periphery of a cylindrical outer ring that is coaxially connected to the second shaft body and is provided to be relatively rotatable on the inner ring. A driving force transmission device comprising a pair of rollers arranged in a circumferential direction in a space and capable of switching between transmission / disconnection of rotational driving force between the first shaft body and the second shaft body. And
An electromagnetic coil having an electromagnetic coil, a rotor disposed adjacent to the electromagnetic coil, and an armature coupled to the rotor when the electromagnetic coil is energized;
A first retainer for retaining the roller pair;
A second holder for holding the pair of rollers, the second holder provided in the first holder for relative rotation;
A direction in contact with the first cage from one side in the circumferential direction and in contact with the second cage from the other side in the circumferential direction so that the pair of rollers approach each other as the guide member moves in one axial direction. In order to press and move the first and second retainers, the first retainer rotates toward the other circumferential direction and the second retainer rotates toward the one circumferential direction. A guide member that guides the armature, the guide member connected to the armature,
A restriction protrusion provided on at least one of the first and second cages and extending from the cage toward the one axial side;
A holding plate that is disposed between the first and second cages and the armature and holds the guide member, and has an insertion recess through which the guide member and the restricting protrusion are inserted; A holding plate provided to be able to rotate along with the inner ring,
The first and second cages are provided on the holding plate so as to be relatively rotatable,
The driving force transmission device in which the amount of rotation of the retainer provided with the restriction protrusion with respect to the holding plate is restricted by engaging the restriction protrusion with the circumferential end of the insertion recess. The restriction protrusion includes a first restriction protrusion provided on the first retainer and a second restriction protrusion provided on the second retainer, and the first and second Is inserted through the insertion recess in a state of sandwiching the guide member in the circumferential direction,
The amount of rotation of the first cage with respect to the holding plate is regulated by engaging the first regulating projection with the end on the other circumferential side of the insertion recess,
The amount of rotation of the second cage with respect to the holding plate is regulated by engaging the second regulating protrusion with an end portion on one circumferential side of the insertion recess. Driving force transmission device.

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