JP6402928B2 - 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 the following Patent Document 1 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. . The control retainer and the rotation retainer are relatively rotated by moving the control retainer in the axial direction by energization / power interruption of the electromagnetic clutch. 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. In addition, since the sliding surface between the ball and the cam is required to have high surface pressure (high hardness), heat treatment or the like is required, which also causes an increase in cost. Although the cam can be formed using ceramics instead of steel material, this also leads to an increase in cost. 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 adopt a two-way clutch including a first and a second retainer that are rotatably provided and a plurality of guide members as a two-way clutch included in the driving force transmission device. Are considering. The guide member has a first sliding surface made of an inclined surface. Moreover, the guide member has the 2nd sliding surface which consists of an inclined surface. As the guide member moves in one axial direction, the first retainer rotates toward the other circumferential direction and presses one roller toward the other circumferential direction. Further, as the guide member moves in one axial direction, the second retainer rotates toward one circumferential direction and presses the other roller toward one circumferential direction. Each roller can be released from the engagement position by pressing each roller. The first and second sliding surfaces are set so that the rotation amounts of the first and second cages are equalized with the axial movement of the guide member.

  However, for some reason, one of the first and second cages rotates smoothly, but the other of the first and second cages does not rotate properly (does not rotate or is difficult to rotate). State) may occur. In this case, when the guide member moves in one axial direction by driving the electromagnetic clutch, the guide member itself also moves in the circumferential direction. As a result, one of the first and second cages is more than the desired amount of rotation. May also rotate excessively. Even when a rotation failure occurs in the other of the first and second cages, it is desirable to prevent excessive rotation of one of the first and second cages.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a driving force transmission device that can regulate the relative movement amount of the first and second cages and thereby prevent excessive rotation of one of the first and second cages. It is to be.

  In order to achieve the above object, the invention of claim 1 is characterized in that transmission / cutting of rotational driving force is performed between a first shaft body (2) and a second shaft body (3) arranged coaxially with each other. Drive force transmission device (1) that can be switched between an inner ring (4) coaxially connected to the first shaft body and a coaxial shaft connected to the second shaft body, and relative rotation to the inner ring A cylindrical outer ring (5) provided in a possible manner and a wedge space (29) formed by the outer circumference of the inner ring and the inner circumference of the outer ring are arranged side by side in the circumferential direction (Y). ) Side first roller (23a) and the other circumferential side (Y2) side second roller (23b), a roller pair (23), and a first retainer for holding the roller pair ( 31) and a second retainer (32) for retaining the roller pair, the relative rotation with respect to the first retainer A second slidable contact surface (53) formed of an inclined surface that slidably contacts the first retainer from one side in the circumferential direction, and the second retainer. A guide member (26) having a second slidable contact surface (54) made of an inclined surface that is slidably contacted from the other side of the direction, and is provided so as to be movable in the axial direction. A guide member that rotates the first cage toward the other circumferential direction and a second cage that pivots toward the other circumferential direction as the head moves, and an armature connected to the guide member (71), wherein the guide member includes an electromagnetic clutch (7) having an armature that can move in the axial direction by driving of the armature, and the rotation of the first cage toward the other circumferential direction. The first retainer points the first roller in the other circumferential direction. The second retainer presses the second roller toward one circumferential direction as the second retainer rotates toward one circumferential direction, and the first retainer One of the second cage and the second cage is provided with an engaging projection (43) for engaging the first and second cages, and the first and second cages The other is provided with an accommodating recess (80) for accommodating the engaging convex portion, and the engaging convex portion engages with a regulating wall of the accommodating concave portion, whereby the first and second holding portions are provided. Provided is a driving force transmission device in which the relative rotation amount of the device is restricted.

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 engaging convex portion is provided on the outer periphery of the first cage, and the accommodating concave portion is provided on the inner periphery of the second cage. A driving force transmission device according to claim 1.

  According to a third aspect of the present invention, the first retainer has a pressing portion (37) provided so as to be able to press the first roller toward the other circumferential direction, and the engaging convex portion is The driving force transmission device according to claim 1, wherein the driving force transmission device is provided in a portion (35) including the pressing portion.

According to the configuration of the first aspect, the engaging convex portion provided on one of the first and second cages is engaged with the restriction wall of the housing concave portion provided on the other of the first and second cages. By combining, the relative rotation amounts of the first and second cages are regulated. Thereby, it can prevent that one of the 1st and 2nd holder | retainer rotates excessively.
According to the structure of Claim 2, an engagement convex part is provided in the outer periphery of a 1st holder | retainer, and an accommodation recessed part is provided in the inner periphery of a 2nd holder | retainer. Thereby, an engagement convex part and an accommodation recessed part are realizable with a comparatively simple structure.

  According to the configuration of the third aspect, since the engagement convex portion is provided in the portion including the pressing portion, the first protrusion of the first cage is compared with the case where the engagement convex portion is provided separately from the portion including the pressing portion. Miniaturization can be achieved.

It is sectional drawing of the driving force transmission apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the structure of the two-way clutch contained in a driving force transmission apparatus. It is a disassembled perspective view which shows the structure of the said two-way clutch. It is a perspective view which shows the structure of an inner side holder | retainer. It is sectional drawing which looked at the structure of the said two-way clutch from the cut surface line VV of FIG. FIGS. 6A and 6B are perspective views showing the configuration of the wedge member. It is a side view which shows the positional relationship between a wedge member, an inner side holder | retainer, and an outer side holder | retainer in the fastening state of the said two-way clutch. It is a front view which shows the positional relationship between a wedge member, an inner side holder | retainer, and an outer side holder | retainer in the fastening state of the said two-way clutch. It is sectional drawing which shows the structure of the said two-way clutch in the released state of the said two-way clutch. It is a side view which shows the positional relationship between a wedge member, an inner side holder | retainer, and an outer side holder | retainer in the releasing state of the said two-way clutch. It is a front view which shows the positional relationship between a wedge member, an inner side holder | retainer, and an outer side holder | retainer in the releasing state of the said two-way clutch. It is a front view which shows the positional relationship between a wedge member, an inner side holder | retainer, and an outer side holder in case rotation failure has arisen in the outer side holder | retainer.

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 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 rotational driving force from the inner ring 4 to the outer ring 5, an electromagnetic clutch 7 for switching engagement / release of the two-way clutch 6, an inner ring 4, an outer ring 5, a two-way clutch 6 and an electromagnetic clutch 7 and a housing 8 that houses the housing 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 an operation shaft connected to a steering member such as a steering wheel and a steering shaft of a steering mechanism such as a rack and pinion. The steering device is equipped with a steer-by-wire system that detects the operating angle of the steering wheel with an angle sensor and transmits the driving force of the steering motor controlled according to the sensor output to the steering shaft. Yes. In normal times, the steer-by-wire system is activated, the two-way clutch 6 is released, and the transmission of the rotational driving force 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 the rotational driving force between the steering shaft and the steered shaft. Is done.

  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 of the other axial direction X2. The second shaft body 3 is supported by the first rolling bearing 10 fixed to the inner periphery of the bearing tube 9 so as to be rotatable and immovable in the axial direction X.
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 the rotational driving force (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. FIG. 4 is a perspective view showing the configuration of the inner cage 31. FIG. 5 is a cross-sectional view of the configuration of the two-way clutch 6 as seen from the cutting plane line V-V in FIG. Hereinafter, the configuration of the two-way clutch 6 will be described 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. 5 shows the engaged state of the two-way clutch 6.

  The two-way clutch 6 is arranged at equal intervals in the circumferential direction Y on a cylindrical surface 21 (see FIG. 5) provided on the inner periphery of the second annular step portion 14 of the outer ring 5 and on the outer periphery of the large-diameter portion 12 of the inner ring 4. A plurality of (for example, three) cam surfaces 22 (see FIG. 5), a plurality of (for example, three) roller pairs 23, and a plurality (the same number as the number of roller pairs 23) of elastic members 24 provided in a line. , A plurality of roller pairs 23 (the number of roller pairs 23) connected to the armature 71 (see FIG. 1) of the electromagnetic clutch 7 (see FIG. 1) so as to be movable in the axial direction X. And the same number of synthetic resin wedge members (guide members) 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. 5, 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. 5, 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 a direction away from each other (circumferential direction Y) is disposed. An example of the elastic member 24 is a compression coil spring. Further, as the elastic member 24, another type of spring such as a leaf spring or a rubber material may be used. One end 24a of the elastic member 24 elastically presses the first roller 23a toward the one Y1 side in the circumferential direction, and the other end 24b of the elastic member 24 elastically presses the second roller 23b toward the other Y2 side in the circumferential direction. Pressing. The elastic member 24 is supported by the spring support surface 28.

  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. Each of the inner cage 31 and the outer cage 32 is rotatably provided. That is, the inner cage 31 and the outer cage 32 are provided so as to be rotatable relative to each other. The inner cage 31 includes a thin disc-shaped first annular portion 33, an annular third annular portion 34 that is coaxially and axially disposed on the one X1 side with respect to the first annular portion 33, and a first annular portion 34, A plurality of connecting portions (portions including pressing portions) 35 that connect one annular portion 33 and the third annular portion 34 are included. The first and third annular portions 33 and 34 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. In addition, the first annular portion 33 is in contact with the large diameter portion 12 from the other side X2 in the axial direction.

  As shown in FIGS. 3 and 4, 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. That is, the inner cage 31 is formed using a synthetic resin material.

Each connection portion 35 has a columnar shape extending along the axial direction X. 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. It integrally includes an engaging projection 43 provided at the end of one axial direction X1. That is, the engagement convex portion 43 is provided on the connection portion 35.
In other words, as shown in FIG. 4, each engagement convex portion 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 engagement protrusion 43 form the same cylindrical surface. A first abutting surface (pressing portion) 37 (mainly FIG. 5) capable of abutting (pressing) the first roller 23a of the pair of rollers 23 on the surface on the other circumferential side Y2 side of each first protrusion 36. Reference) is formed. 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 being in surface contact with the first roller 23a, and may be in a line contact or point contact with the first roller 23a.

  A first sliding contact surface 38 (mainly see FIGS. 3 and 5) is formed on the surface on the Y1 side in the circumferential direction of each connection portion 35 so as to be in sliding contact with the corresponding wedge member 26. The first slidable contact surface 38 is formed of a flat inclined surface that extends in the circumferential direction Y1 as it extends in the axial direction X1 of the inner ring 4. The inclination angle of the first slidable contact surface 38 is set to an angle that matches the first slidable contact surface 53 described later.

  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 8 so as to be rotatable relative to the outer ring 8. 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.). . That is, the outer cage 32 is formed using a synthetic resin material.

  An accommodation recess 80 that is recessed outward in the radial direction Z is formed in the inner periphery of the second annular portion 39 in the axial direction X. The accommodating recesses 80 have a one-to-one correspondence with the second protrusions 40 and are provided in the same number (for example, three) as the number of the second protrusions 40. Each accommodating recess 80 is formed in the second annular body 39 in a region adjacent to the other circumferential direction Y2 side of the corresponding second protrusion 40 over a predetermined circumferential direction Y length. Each receiving recess 80 is a recess for receiving the engaging protrusion 43 of the inner cage 31 and inserting the insertion portion 51 of the wedge member 26. Further, the side surface on the other Y2 side in the circumferential direction of each housing recess 80 abuts on an engaged portion 43a of an engaging convex portion 43 provided in the inner retainer 31 described later, and the outer retainer of the inner retainer 31 It functions as a regulating wall 81 that regulates the amount of rotation with respect to 32.

  A second contact surface 41 (mainly see FIG. 5) that can contact (press) 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 annular portion 39. 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 being in 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 5) is formed on the surface of the second annular portion 39 on the other circumferential side Y2 side so as to slidably contact the corresponding wedge member 26. The second slidable contact surface 42 is a flat inclined surface that extends toward the other circumferential direction Y2 as it goes toward the one axial direction X1. The inclination angle of the second slidable contact surface 42 is set to an angle that matches a second slidable contact surface 54 described later.

Since each second protrusion 40 is provided with a second slidable contact surface 42, the member provided with the second slidable contact surface 42 is compared with the case where the second protrusion 40 is provided as a separate member. Thus, the number of parts can be reduced.
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.

  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.
FIG. 6 is a perspective view showing the configuration of the wedge member 26. 6 (A) and 6 (B), 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 expands in the circumferential direction Y from the other end in the direction X. The insertion portion 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 an inclined surface that extends toward the one circumferential direction Y1 as it goes to the one axial direction X1, and slidably contacts the connecting portion 35 from the one circumferential direction Y1 side. The second slidable contact surface 54 is an inclined surface that is directed toward the other circumferential direction Y2 toward the one axial direction X1 and is in sliding contact with the second protrusion 40 of the adjacent roller pair 23 from the other circumferential Y2 side. The first and second sliding contact surfaces 53 and 54 are opposite to each other and are formed by flat surfaces.

The first and second slidable contact surfaces 53 and 54 may each be formed by a convex curved surface that is convex with respect to the axial direction X instead of a flat surface. In this case, the first and second sliding contact surfaces 53 and 54 may be configured by a concave curved surface having a larger radius of curvature than the convex curved surface, or the curved surface and a flat surface (inclined surface). The shape may be combined.
As shown in FIG. 1, the electromagnetic clutch 7 includes an annular armature 71 to which a plurality of wedge members 26 are connected, an annular rotor 72 facing the armature 71 on the one axial side X1 and the 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 70 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 back plate 70 has an annular shape and is externally fitted and fixed to the shaft portion 11 of the inner ring 4. The back plate 70 is formed using, for example, a steel material. The main surface on the other axial direction X2 side of the back plate 70 is in sliding contact with the main surface on the one axial X1 side of the third annular portion 34 and the second annular portion 39, respectively. A plurality of insertion holes 85 (the same number as the number of wedge members 26) are arranged in the back plate 70 at equal intervals in the circumferential direction Y. Each insertion hole 85 (only one is shown in FIG. 1) 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 hole 85.

  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. The third bearing 74 makes the electromagnet 73 and the first shaft body 2 relatively rotatable.

  FIG. 7 is a side view showing the positional relationship between the wedge member 26 and the inner cage 31 and the outer cage 32 when the two-way clutch 6 is engaged. FIG. 8 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. 8 is also a view seen from one axial direction X1 side. FIG. 9 is a cross-sectional view showing a configuration of the two-way clutch 6 in a released state of the two-way clutch 6, and is a cross-sectional view taken along the section line VV of FIG. FIG. 10 is a side view showing the 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. FIG. 11 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. FIG. 11 is a view as seen from one axial direction X1 side.

As shown in FIGS. 4, 7, and 8, 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 (position shown in FIG. 7).
In this state, as shown in FIGS. 4 and 5, each first roller 23 a is moved by the elastic member 24 to the first engagement position 29 a provided at the end portion on the Y1 side in the circumferential direction of the wedge space 29. It is elastically pressed toward. 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 recess 14). To do. 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 engages with the outer periphery of the inner ring 4 (large diameter portion 12) and the inner periphery of the outer ring 5 (second annular recess 14). To do. 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. Further, in this state, as shown in FIG. 8, the engaged portion 43 a of the engaging convex portion 43 provided in the inner cage 31 is in the circumferential direction Y between the regulating wall 81 of the accommodating concave portion 80. A large interval is provided.

  In this state, the insertion part 51 of the wedge member 26 is inserted between the connection part 35 and the second protrusion 40 of the adjacent roller pair 23. The first slidable contact surface 53 provided on the surface on the other circumferential side Y2 side of the wedge member 26 is opposed to the first slidable contact surface 38 of the connection portion 35 with a minute gap therebetween. The second slidable contact surface 54 provided on the surface on the Y1 side in the circumferential direction of the wedge member 26 has a minute gap between the second slidable contact surface 42 of the second protrusion 40 of the adjacent roller pair 23. It is facing away.

  On the other hand, when the electromagnetic clutch 7 is switched to the on state, the armature 71 is attracted by the electromagnetic clutch 7 as shown in FIGS. 9, 10, and 11, so that the plurality of wedge members 26 connected to the armature 71 are provided. It is drawn in one axial direction X1 side (moves in the axial direction X). By this drawing, the wedge member 26 is arranged at the second position (position of the wedge member 26 shown in FIG. 10) on the one side X1 in the axial direction from the first position (position of the wedge member 26 shown in FIG. 7). The

Since the first slidable contact surface 53 provided on the surface in the other circumferential direction Y2 side of the wedge member 26 is an inclined surface directed toward the circumferential direction one Y1 toward the one axial direction X1, one axial direction of each wedge member 26 Along with the movement to X1, the first sliding contact surface 53 guides the connecting portion 35 toward the other Y2 side in the circumferential direction while being in sliding contact with the first sliding contact surface 38 of the connecting portion 35.
In addition, since the second sliding contact surface 54 provided on the surface on the Y1 side in the circumferential direction of the wedge member 26 is formed of an inclined surface toward the other Y2 in the circumferential direction toward the one X1 in the axial direction, the axis of each wedge member 26 As the second slidable contact surface 54 is slidably in contact with the second slidable contact surface 42 of the second projecting portion 40 of the adjacent roller pair 23 with the movement in one direction X1, the second projecting portion 40 is moved. Guide to the Y1 side in the circumferential direction. That is, as each wedge member 26 moves in one axial direction X1, the connection portion 35 and the second protrusion 40 of the adjacent roller pair 23 move away from the wedge member 26 (insertion portion 51), and as a result. The inner cage 31 rotates toward the other circumferential direction Y2, and the outer cage 32 pivots toward the circumferential direction one Y1. At this time, the third annular portion 34 and the second annular portion 39 slide on the back plate 70, respectively. The rotation amount of the outer cage 32 and the inner cage 31 is determined between the side surface (regulation wall 81) on the other circumferential side Y2 side of the housing recess 80 of the outer cage 32 and the corresponding insertion portion 51 of the wedge member 26. It may be regulated by contact.

  As the inner cage 31 rotates to the other Y2 side in the circumferential direction, each first contact surface 37 moves to the other Y2 side in the circumferential direction, and as a result, comes into contact with the corresponding first roller 23a. The first roller 23a is pressed toward the other circumferential direction Y2. Thereby, each 1st roller 23a is moved toward the other circumferential direction Y2 against the elastic pressing force of the elastic member 24. FIG. As a result, each first roller 23a is released from the first engagement position 29a (see FIG. 5), 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.

  Further, as the outer cage 32 rotates toward the one Y1 side in the circumferential direction, each second abutment surface 41 moves toward the one Y1 side in the circumferential direction, and as a result, contacts the corresponding second roller 23b. In contact therewith, the second roller 23b is pressed toward one circumferential direction Y1. As a result, the second roller 23b is moved toward one circumferential direction Y1 against the elastic pressing force of the elastic member 24. Thereby, each 2nd roller 23b remove | deviates from the 2nd engagement position 29b (refer FIG. 5), and as shown in FIG. 9, it is a clearance gap between each 2nd roller 23b and the inner periphery of the outer ring | wheel 5. S2 is formed. Thereby, each second roller 23b is disengaged from the outer periphery of the inner ring 4 and the inner periphery of the outer ring 5.

  As described above, 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, so that the two-way clutch 6 is Released state. In this state, as shown in FIG. 11, a minute gap is formed between the engaged portion 43 a of the engaging convex portion 43 provided in the inner cage 31 and the regulating wall 81 of the accommodating concave portion 80. ing.

In the above-described two-way clutch 6, the specifications of the first and second sliding contact surfaces 53 and 54 are common, and the specifications of the first and second sliding contact surfaces 38 and 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 has a rotation failure (not rotating or difficult to rotate).

FIG. 12 is a front view showing a positional relationship between the wedge member 26, the inner holder 31, and the outer holder 32 when a rotation failure occurs in the outer holder 32. FIG. 12 is a diagram viewed from the axial direction X1 side. It is assumed that the inner cage 31 rotates smoothly.
In this case, when the wedge member 26 is moved toward 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. 7 and the like). ) And the second sliding contact surface 42 (see FIG. 7, etc.), the wedge member 26 itself moves toward the other circumferential direction Y2 as shown in FIG. As a result, the outer cage 32 may be excessively rotated to the other circumferential direction Y2 side with respect to the intended rotation amount.

  In this embodiment, the engaged portion 43a of the engaging convex portion 43 provided on the inner cage 31 abuts (engages with) the restriction wall 81 of the housing concave portion 80 formed on the inner periphery of the outer cage 32. ) Thereby, it can prevent that the outer side holder | retainer 32 rotates excessively. That is, since the relative rotation amount of the inner cage 31 and the outer cage 32 is restricted, the excessive rotation of the outer cage 32 can be prevented using this.

Moreover, in order to implement | achieve regulation of the excessive rotation of the outer side holder | retainer 32 by the engagement convex part 43 and the accommodation recessed part 80 which were provided in the inner side holder | retainer 31 and the outer side holder | retainer 32, it is another member to control excessive rotation The number of parts can be reduced as compared with the case of providing, and therefore the cost can be reduced.
Further, by providing the engaging convex portion 43 on the outer periphery of the third annular portion 34 of the inner cage 31 and providing the accommodating concave portion 80 on the inner periphery of the second annular portion 39 of the outer cage 32, Engagement of the engaging convex portion 43 and the accommodating concave portion 80 is realized. Thereby, engagement with the engagement convex part 43 and the accommodation recessed part 80 is realizable with a comparatively simple structure.

Moreover, since the engagement convex part 43 is provided in the connection part 35, compared with the case where the engagement convex part 43 is provided separately from the connection part 35, size reduction of the inner side holder | retainer 31 can be achieved.
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, it has been described that the engagement convex portion 43 is provided in the connection portion 35, but may be provided in a portion other than the connection portion 35 of the inner cage 31. Further, the engaging protrusion 43 may be provided at a position other than the outer periphery of the inner holder 31.

Further, the housing recess 80 may be provided at a position other than the inner periphery of the outer cage 32.
Further, the engaging convex portion 43 may be provided in the outer cage 32, and the accommodating concave portion 80 may be provided in the inner cage 31.
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, 23a ... 1st roller, 23b ... 2nd roller, 26 ... wedge member (guide member), 29 ... wedge space, 29a ... first engagement position, 29b ... second engagement position, 31 ... inner retainer (first retainer), 32 ... Outer cage (second cage), 37 ... First contact surface (pressing portion), 43 ... Engaging convex portion, 53 ... First sliding contact surface, 54 ... Second sliding contact surface 71 ... Armature, 80 ... Housing recess, 81 ... Restriction wall, X1 ... One axial direction, X2 ... Other axial direction, Y ... Circumferential direction, Y1 ... One circumferential direction, Y2 ... Other circumferential direction

Claims (3)

A driving force transmission device capable of switching transmission / disconnection of rotational driving force between a first shaft body and a second shaft body arranged coaxially with each other,
An inner ring coaxially connected to the first shaft body;
A cylindrical outer ring that is coaxially connected to the second shaft body and that is rotatably provided to the inner ring;
A roller pair that is arranged in a circumferential direction in a wedge space formed by the outer periphery of the inner ring and the inner periphery of the outer ring, and includes a first roller on one circumferential side and a second roller on the other circumferential side. ,
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 first slidable contact surface comprising an inclined surface that is slidably contacted with the first retainer from one circumferential side, and a second slidable surface comprising an inclined surface that is slidably contacted with the second retainer from the other circumferential direction. A guide member that is movable in the axial direction and rotates the first retainer toward the other circumferential direction as the guide member moves in one axial direction. And a guide member for rotating the second cage toward one circumferential direction;
An armature coupled to the guide member, the electromagnetic clutch having an armature in which the guide member is axially movable by driving the armature;
As the first cage rotates toward the other circumferential direction, the first cage presses the first roller toward the other circumferential direction, and one circumferential direction of the second cage The second retainer presses the second roller toward one circumferential direction as it turns to
One of the first and second cages is provided with an engaging projection for engaging the first and second cages, and the first and second cages On the other side, an accommodating recess for accommodating the engaging convex portion is provided, and the engaging convex portion engages with a regulation wall of the accommodating concave portion, so that the first and second cages are relatively disposed. A driving force transmission device in which the amount of rotation is regulated. The engagement convex portion is provided on the outer periphery of the first cage,
The driving force transmission device according to claim 1, wherein the housing recess is provided on an inner periphery of the second cage.   The first retainer has a pressing portion provided so as to be able to press the first roller toward the other circumferential direction, and the engagement convex portion is provided in a portion including the pressing portion. The driving force transmission device according to claim 1 or 2.

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