JP7070058B2 - Vehicle seat reclining device - Google Patents

Description

The present invention relates to a vehicle seat reclining device. More specifically, the present invention relates to a vehicle seat reclining device for adjusting the tilt angle of the seat back.

Conventionally, as a seat reclining device for a vehicle, a device provided with a stepped lock mechanism capable of adjusting the backrest angle of the seat back at a constant pitch angle is known (Patent Document 1). The vehicle seat reclining device described above is configured as a joint device for connecting the seat back to a state in which the backrest angle can be adjusted with respect to the seat cushion. Specifically, the vehicle seat reclining device described above includes a ratchet and a guide made of substantially disk-shaped metal members assembled so as to be able to rotate relative to each other, a lock mechanism for locking these relative rotations, and a ratchet. It is configured to include an outer peripheral ring that is mounted across the outer peripheral portion between the guide and the guide and holds them in an axially assembled state.

International Publication No. 2016/129423

In the above-mentioned conventional technique, since the ratchet and the guide are fitted in a state where they can rotate relative to each other with play inside and outside in the radial direction, rattling occurs in the radial direction. The present invention has been devised to solve the above problems, and the problem to be solved by the present invention is to properly provide radial play between the ratchet and the guide in the vehicle seat reclining device. It is to suppress.

In order to solve the above problems, the vehicle seat reclining device of the present invention takes the following means.

The first invention is a vehicle seat reclining device, which is a ratchet and a guide assembled axially so as to be able to rotate relative to each other, and a lock mechanism provided between the ratchet and the guide to lock the relative rotation. It also has an outer peripheral ring that is mounted across the outer peripheral portion of the ratchet and the guide and holds them in an axially assembled state. The outer ring is slanted from the outside in the axial direction and the outside in the radial direction by the diagonal contact structure formed between the joint portion connected to one of the ratchet and the guide and the other. It has an oblique contact portion that is formed. The slanted contact structure has a contact area where the slanted abutment is applied to the other and a non-contact area where the slanted abutment is separated from the other in the rotation region of the ratchet with respect to the guide.

According to the first invention, the slanted contact structure can appropriately suppress rattling in the axial direction and the radial direction of the other of the ratchet and the guide. Specifically, the structure in which the oblique contact structure has a contact region and a non-contact region provides a region in which ratchet and the guide are suppressed from rattling via the outer peripheral ring in the rotation region with respect to the ratchet guide. It is possible to set two areas, one is an area where ratcheting is allowed and the ratchet rotation can be made smoother.

The second invention has the following configuration in the first invention described above. The ratchet has a lock region in which the relative rotation lock by the lock mechanism is effective and a free region in which the relative rotation lock by the lock mechanism is invalid in the rotation region with respect to the guide. The contact area in the oblique contact structure is a rotation range including the lock position of the first stage entering the lock area from the free area of the ratchet.

According to this second invention, it is possible to appropriately suppress the radial rattling between the ratchet and the guide when the ratchet is used in the lock position of the first stage.

The third invention has the following configuration in the first or second invention described above. From the protruding inclined surface in which the oblique contact structure projects so as to diagonally face the outside in the axial direction and the outside in the radial direction from the other partial region in the circumferential direction, and the partial region in the circumferential direction of the outer peripheral ring. The diagonal contact portion formed so as to project inward in the axial direction and / or inward in the radial direction is configured to be applied by being overlapped with each other in the circumferential direction.

According to the third invention, an oblique contact structure having a region for suppressing rattling between the ratchet and the guide and an allowable region is provided on the outer peripheral ring and the other so as to project from each partial region. It can be embodied by a simple structure.

The fourth invention has the following configuration in the third invention described above. The protruding inclined surface formed on the other side and the oblique contact portion formed on the outer peripheral ring are evenly arranged at a plurality of points in the circumferential direction, and each of them is in contact with the ratchet at the same time due to rotation with respect to the guide. It can be switched to the contact state.

According to the fourth invention, it is possible to suppress the ratchet and the guide in the radial direction in a well-balanced manner due to the plurality of diagonal contact structures evenly arranged in the circumferential direction.

The fifth invention has the following configuration in any one of the above-mentioned first to fourth inventions. The other side that is in contact with the diagonal contact portion described above is the ratchet.

According to the fifth invention, the outer peripheral ring can appropriately suppress the ratchet rattling with respect to the guide in the radial direction.

The sixth invention has the following configuration in any one of the first to fifth inventions described above. The diagonal contact portion has a corner contact structure in which the corner portion extending inward in the radial direction is brought into contact with the other.

According to the sixth invention, the diagonal contact portion of the outer peripheral ring can be configured to be obliquely applied to the other without having a shape that extends long in the axial direction.

The seventh invention has the following configuration in any one of the above-mentioned first to sixth inventions. The diagonal contact portion is curved inward in the axial direction from multiple points in the circumferential direction of the flange portion that covers the other formed in the outer peripheral ring with a ring shape that connects from the outside in the axial direction to the circumferential direction. It is formed as a bent portion that protrudes.

According to the seventh invention, the oblique contact portion can be configured to have a high structural strength protruding from a part of the ring-shaped flange portion connected to the outer peripheral ring in an endless manner, and the structure is radial with respect to the ratchet guide. Rattling can be suppressed appropriately.

The eighth invention has the following configuration in any one of the above-mentioned first to seventh inventions. The contact area in the diagonal contact structure is the rotation range at which the seat back is used as a backrest.

According to the eighth invention, when the seat back is used as a backrest, the radial backlash between the ratchet and the guide can be appropriately suppressed, and when the seat back is used as a backrest. The locked state of can be made more stable.

FIG. 3 is a perspective view showing a schematic configuration of a vehicle seat to which the vehicle seat reclining device of the first embodiment is applied. It is an exploded perspective view of the main part of FIG. FIG. 2 is an exploded perspective view of FIG. 2 as viewed from the opposite side. It is an exploded perspective view of the seat reclining device for a vehicle. FIG. 4 is an exploded perspective view of FIG. 4 as viewed from the opposite side. It is an outside view of the seat reclining device for a vehicle. It is an inside side view of the seat reclining device for a vehicle. It is a front side view of the seat reclining device for a vehicle. FIG. 1 is a sectional view taken along line IX-IX of FIG. FIG. 8 is a sectional view taken along line XX of FIG. 8 showing a locked state of a vehicle seat reclining device. It is sectional drawing corresponding to FIG. 10 which showed the unlocked state of the seat reclining apparatus for a vehicle. FIG. 11 is a cross-sectional view showing a state in which the ratchet is turned to the free region from FIG. FIG. 12 is a cross-sectional view showing a state in which the locking operation of the vehicle seat reclining device is prevented from FIG. FIG. 12 is a cross-sectional view showing a state in which the ratchet is rotated to the end position of the free region from FIG. It is an enlarged view of the XV part of FIG. It is sectional drawing which showed the state that the rotary cam is pressed against a guide wall by urging. It is sectional drawing which showed the change of the lock operation of each pole with the change of the rotation position of a ratchet separately for the cases (a) to (d). It is a schematic diagram showing the positional relationship between the riding protrusion of each pole and the protrusion of the ratchet in FIGS. 17A to 17D. It is an outside view of each pole. It is an inside side view of each pole. It is a side view showing the state that the seat back is a torso angle. FIG. 21 is an internal side view showing a state of the vehicle seat reclining device in FIG. 21. FIG. 22 is a cross-sectional view taken along the line XXIII-XXIII of FIG. FIG. 22 is a cross-sectional view taken along the line XXIV-XXIV of FIG. It is a side view showing the state which the seat back was tilted backward from the angle of FIG. FIG. 25 is an internal side view showing a state of the vehicle seat reclining device in FIG. 25. FIG. 26 is a sectional view taken along line XXVII-XXVII of FIG. 26. FIG. 26 is a sectional view taken along line XXVIII-VIII of FIG. 26. It is a side view showing the state which the seat back was moved forward from the angle of FIG. FIG. 29 is an internal side view showing a state of the vehicle seat reclining device in FIG. 29. FIG. 30 is a cross-sectional view taken along the line XXXI-XXXI of FIG. FIG. 30 is a cross-sectional view taken along the line XXXII-XXXII of FIG. It is a perspective view which showed the schematic structure of the seat reclining apparatus for a vehicle of another Example.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

<< ● About the outline configuration of the seat reclining device 4 >>
First, the configuration of the seat reclining device (seat reclining device for vehicles) 4 of the first embodiment will be described with reference to FIGS. 1 to 32. In the following description, when each direction such as front-back, up-down, left-right, etc. is shown, it means each direction shown in each figure. Further, when the term "seat width direction" is used, it refers to the left-right direction of the seat 1.

As shown in FIG. 1, the seat reclining device 4 of this embodiment is applied to the seat 1 constituting the right seat of the automobile. The seat reclining device 4 described above is configured as a seat reclining adjusting mechanism that connects the seat back 2 that is the backrest portion of the seat 1 described above to the seat cushion 3 that is the seating portion so that the backrest angle can be adjusted. Has been done. Specifically, the above-mentioned seat reclining device 4 is provided between the above-mentioned seat back 2 and the above-mentioned seat cushion 3 in pairs on the left and right, and each of them is integrated to switch to each lock / unlock state. By doing so, the seat back 2 is configured to fix or release the backrest angle.

Specifically, the above-mentioned seat reclining device 4 has the lower end portions of the side frames 2F forming the left and right side skeletons of the above-mentioned seat back 2 and the left and right sides of the seat cushions 3 located outside the seat width direction. It is configured to be interposed between each reclining plate 3F connected to the rear end of the skeleton, and to be connected in a form that allows them to rotate or stop rotating coaxially with each other. (See FIGS. 2 to 3).

The seat reclining device 4 described above is always held in a locked state in which the backrest angle of the seat back 2 is fixed. Then, the seat reclining device 4 is released from the locked state all at once by the operation of pulling up the reclining lever 5 provided on the right side portion of the seat cushion 3 on the outer side of the vehicle, and the seat back 2 is backed up. It can be switched to the unlocked state where the angle can be changed. Then, the seat reclining device 4 is returned to the locked state by urging by returning the raised operating state of the reclining lever 5 described above.

Here, between the side frames 2F on the left and right sides of the seat back 2 described above and the reclining plates 3F arranged on the outside of the side frames 2F, respectively, in the direction of always tilting forward with respect to the seat back 2. The return spring 6 that applies the force of the spring is hooked. Due to the rotational urging force of the return spring 6, the seat back 2 is raised to a position where it hits the back of the seated occupant by releasing the fixed state of the backrest angle by the seat reclining device 4 described above, and the back of the seated occupant. The backrest angle can be freely adjusted back and forth according to the movement of the tilting back and forth. With the above configuration, the seat back 2 can easily adjust the backrest angle.

The above-mentioned seat back 2 has a rotation region of about 180 degrees between the above-mentioned seat cushion 3 and the front-tilt position folded on the upper surface thereof and the back-tilt position when the seat back 2 is tilted substantially straight to the rear side. Can be rotated in the front-rear direction of the seat. Of these, the rotation region of about 90 degrees from the upright position where the backrest angle of the seat back 2 stands up substantially straight to the upper side (the first-stage lock position S1 shown in FIG. 21) to the above-mentioned rearward tilting position is It is set as a "lock area A1" in which the backrest angle of the seat back 2 is returned to a fixed state by releasing the pulling operation of the reclining lever 5. Further, in the rotation region from the above-mentioned upright position to the forward tilted position, the backrest angle of the seatback 2 is fixed even if the pulling operation of the reclining lever 5 is released. It is set as the "free area A2" that is maintained in the released state (the state in which the lock is invalidated) without being returned to the state.

The lock area A1 and the free area A2 described above are formed by the lock area A1 and the free area A2 set in the seat reclining device 4 described later, respectively. Due to the setting of the free area A2 described above, when the reclining lever 5 is operated while no person is sitting on the seat 1, the seat back 2 is tilted to a position where it enters the free area A2 by the urging of the return spring 6 described above. After that, the reclining lever 5 is tilted to the forward leaning posture position without continuing the operation state.

As shown in FIGS. 2 to 3, the above-mentioned seat reclining device 4 specifically includes a ratchet 10 integrally coupled to the outer surface of the side frame 2F on each side of the above-mentioned seat back 2. The seat back 2 has a guide 20 that is integrally coupled to the inner surface of the reclining plate 3F on the side, and the ratchet 10 and the guide 20 are locked or unlocked from each other's relative rotation. It is configured to fix and release the backrest angle.

<< Specific configuration of seat reclining device 4 >>
Hereinafter, the specific configuration of the seat reclining device 4 provided in the pair of left and right sides described above will be described in detail. Since the seat reclining devices 4 have the same configuration in which they are oriented symmetrically with each other, they are represented below and arranged on the outside (right side) of the vehicle shown in FIGS. 2 to 3. The configuration on one side will be described.

As shown in FIGS. 4 to 5, the seat reclining device 4 includes a substantially disk-shaped ratchet 10 and a guide 20 that are assembled axially to each other, three poles 30 that are assembled between them, and the radial directions thereof. A rotary cam 40 that moves in and out, a lock spring 50 composed of a spiral spring that urges the rotary cam 40 against the guide 20 in the rotational operation direction of the lock, and a straddle between the outer peripheral portions of the ratchet 10 and the guide 20. It is configured to have a substantially cylindrical outer ring 60 that is mounted and holds them in an axially assembled state. The ratchet 10, the guide 20, the three poles 30, and the rotary cam 40 described above are each hardened by quenching after press molding to increase the structural strength. Here, the ratchet 10 described above corresponds to the "other" of the present invention, and the guide 20 corresponds to the "one" of the present invention. Further, a mechanism including three poles 30 and a rotating cam 40 for performing these movement operations corresponds to the "locking mechanism" of the present invention. Hereinafter, the specific configuration of each member constituting the seat reclining device 4 described above will be described in detail in order.

《◆ About Ratchet 10》
As shown in FIG. 4, the ratchet 10 has a structure in which one metal plate member is cut into a substantially disk-like shape and is half-cut in the plate thickness direction (axial direction) in places. Has been done.

Specifically, on the outer peripheral edge portion of the disk main body 11 of the ratchet 10 described above, a cylindrical portion 12 projecting in a substantially cylindrical shape in the axial direction, which is the direction of assembly to the guide 20, is formed. Specifically, the above-mentioned cylindrical portion 12 is half-punched so that the outer peripheral edge portion of the disk body 11 protrudes in two stages in the axial direction, and the inner peripheral side thereof is shorter in the axial direction than the cylindrical portion 12. The structure is formed in a stepped cylindrical shape having a cylindrical shape with two stages inside and outside, in which an intermediate cylindrical portion 13 protruding into a substantially cylindrical shape is formed.

On the inner peripheral surface of the cylindrical portion 12 described above, the inner peripheral teeth 12A having the tooth surface facing inward in the radial direction are formed so as to be continuously arranged over the entire area in the circumferential direction. The above-mentioned inner peripheral teeth 12A are formed in a tooth surface shape that allows each outer peripheral tooth 31 formed on the outer peripheral surface of each pole 30 described later to be pressed from the inside in the radial direction to be engaged. Specifically, the above-mentioned inner peripheral tooth 12A has a configuration in which each tooth surface is formed so as to be arranged at equal intervals at a pitch of 2 degrees in the circumferential direction.

Further, on the inner peripheral surface of the intermediate cylindrical portion 13, three circumferential regions (first region 13A, second region 13A, second) in which the inner diameter and the circumferential length from the central portion (central axis C) are individually set. Regions 13B and a third region 13C), a first convex portion 13D and a second convex portion 13E protruding inward in the radial direction from the boundary of a part of these regions, and the above-mentioned third region 13C. At the boundary position with the second convex portion 13E, a relief recess 13F that is recessed outward in the radial direction is formed.

The first region 13A, the second region 13B, and the third region 13C described above are formed in an inner peripheral surface shape curved so as to draw a concentric arc around the central portion (central axis C). There is. Specifically, the first region 13A and the third region 13C are formed in an inner peripheral surface shape having an inner diameter larger than that of the second region 13B, and the first region 13A and the third region 13C are mutually formed. It is formed in the shape of an inner peripheral surface having the same inner diameter.

In the first region 13A described above, as shown in FIGS. 10, 17 (a) and 18 (a), the main pole P1 of the three poles 30 described later is rotated around the same region by the rotation of the ratchet 10. Locking of the main pole P1 that allows the main pole P1 to move radially outward to mesh with the inner peripheral teeth 12A of the ratchet 10 when placed overlapping in the direction. It constitutes the region A1.

Further, the second region 13B and the third region 13C are the remaining two of the three poles 30 when the main poles P1 are arranged so as to overlap each other in the circumferential direction in the first region 13A described above. The other region A3, which is arranged so as to overlap the two sub-poles P2 in the circumferential direction, functions to allow the meshing movement of these sub-poles P2 to the inner peripheral teeth 12A of the ratchet 10.

However, as shown in FIG. 12, when the above-mentioned second region 13B is arranged so that the above-mentioned main pole P1 overlaps the same region in the circumferential direction due to the rotation of the ratchet 10, FIGS. 13 and 17 (b) And as shown in FIG. 18B, the main pole P1 functions to stop the movement of the main pole P1 in the radial direction for meshing with the inner peripheral teeth 12A of the ratchet 10 on the way. It constitutes the free area A2 of.

When the main pole P1 is arranged so as to overlap the second region 13B described above in the circumferential direction, the third region 13C and the first region 13A described above are the remaining two sub poles P2 and the circumferential direction, respectively. As the other region A3 which is arranged so as to overlap with the above-mentioned region, it functions to escape the movement of each sub-pole P2 synchronized with the movement of the main pole P1 described above in these regions.

That is, the intermediate cylindrical portion 13 of the ratchet 10 described above is referred to the lock region A1 (FIGS. 10, 17 (a) and 18 (a)) that allows the lock operation of the main pole P1 in the above-mentioned first region 13A. ), And in the second region 13B, the lock operation of the main pole P1 is blocked by riding, and the ratchet 10 can be freely rotated in the circumferential direction while being held in the unlocked state (FIG. 13). , FIG. 17 (b) and FIG. 18 (b)).

Then, as shown in FIGS. 10, 17 (a) and 18 (a), when the above-mentioned main pole P1 is arranged so as to overlap the first region 13A in the circumferential direction, the second region 13B and the second region 13B are arranged. The region 13C of 3 is configured to allow the remaining two sub-poles P2 to lock in synchronization with the movement of the main pole P1 as the other region A3, respectively. Further, as shown in FIGS. 13, 17 (b) and 18 (b), when the above-mentioned main pole P1 is arranged so as to overlap the second region 13B in the circumferential direction by the rotation of the above-mentioned ratchet 10. The third region 13C and the first region 13A become the other regions A3, respectively, and the remaining two sub poles P2 synchronize with the movement of the main pole P1 to allow the movement in which the lock operation is blocked in the middle. It is designed to work like this.

In this way, the intermediate cylindrical portion 13 of the ratchet 10 controls the allowable / blocking of the lock operation of the main pole P1 by the above-mentioned first region 13A and the second region 13B, and the remaining two sub poles P2 at that time are controlled. The other region (other region A3) in which the two sub-poles P2 are located is configured to allow the movement of the two sub-poles P2 to escape in synchronization with the movement of the main pole P1.

In the first convex portion 13D and the second convex portion 13E, as shown in FIGS. 17 (c) and 18 (c), the above-mentioned main pole P1 has a lock region A1 (first) due to the rotation of the ratchet 10. When transitioning from the region 13A) to the free region A2 (second region 13B), it is halfway pushed outward in the radial direction and mistakenly made a step between the first region 13A and the second region 13B. When it is pressed in the circumferential direction (when the arrangement is as shown in FIGS. 17 (b) and 18 (b)), the load due to the pressure is not concentrated only on the main pole P1 and the other two. It functions to bring two sub poles P2 into contact with each other at the same time so that they can be dispersed to the sub poles P2.

That is, in the above-mentioned first convex portion 13D and the second convex portion 13E, the main pole P1 described above is circumferentially oriented to the step between the first region 13A and the second region 13B due to the rotation of the ratchet 10. It is formed at a position where it is pressed against the remaining two sub-poles P2 in the circumferential direction when it is pressed against.

As shown in FIGS. 14, 17 (d) and 18 (d), the relief recess 13F is circumferentially above the second region 13B where the above-mentioned main pole P1 is the free region A2 due to the rotation of the ratchet 10. When it moves to the terminal position, the main pole P1 is removed from the riding state so that it can be engaged with the inner peripheral teeth 12A of the ratchet 10 at that position. The seat reclining device 4 is tilted by the relief recess 13F to the terminal position of the free region A2, that is, the seat back 2 is folded forward to the upper surface of the seat cushion 3 described in FIG. It is locked at that position so that the seat back 2 can be switched to a state in which the rotation is stopped. As a result, the seat back 2 can be locked so as not to flutter at the forward tilted position.

As shown in FIGS. 4 to 5, a through hole 11A penetrating into a round hole shape is formed in the central portion (position on the central axis C) of the disk main body 11 of the ratchet 10 described above. An operation pin 5A inserted and mounted in the central portion (position on the central axis C) of the rotary cam 40, which will be described later, is inserted into the through hole 11A from the outside in the axial direction in a rotation-free state. It has become. Further, as shown in FIG. 5, on the outer surface of the disk main body 11 of the ratchet 10 described above, three positions in the circumferential direction arranged on the same circumference around the center portion (central axis C). A dowel 14 is formed which is extruded in an arc shape in the axial direction and protrudes.

Each of the above-mentioned dowels 14 has a shape that can be accommodated in each of the circumferentially formed regions in which the first region 13A, the second region 13B, and the third region 13C of the above-mentioned intermediate cylindrical portion 13 are formed. Is formed in. As shown in FIG. 3, the ratchets 10 having the above configuration are assembled so that the outer surface of the disk body 11 is in surface contact with the outer surface of the side frame 2F of the seat back 2 described above, and the ratchets 10 are in contact with each other. By welding the contact points, they are integrally connected to the side frame 2F of the seat back 2 (welded points W).

Specifically, in the above-mentioned ratchet 10, each of the three dowels 14 formed on the outer surface of the disk body 11 penetrates the corresponding substantially arc shape formed on the side frame 2F of the seat back 2. It is assembled in a fitted state in the fitting hole 2F, and the peripheral regions (bonding region A4) of each of these fitted portions are joined in a state of surface contact with the side frame 2F by laser welding. It is combined (welded portion W).

More specifically, on the outer surface of the disk body 11 of the ratchet 10 described above, in the area on both sides in the radial direction and the circumferential direction of the region in which the three dowels 14 are formed, on the side frame 2F described above. A coupling region A4 is formed which is applied to the surface contact state and laser welded. As shown in FIG. 7, in each of the above-mentioned coupling regions A4, the first region 13A and the third region 13C of the above-mentioned intermediate cylindrical portion 13 formed on the outer peripheral edges thereof are larger than the second region 13B. Due to the configuration in the position extended to the outside in the radial direction, the region in each of the circumferential formation regions where the first region 13A and the third region 13C are formed is the second region. It is configured to have an expansion surface portion 11B whose area is expanded in the radial direction from the region in the formation region in the circumferential direction in which the 13B is formed.

With the above configuration, the outer surface of the disk body 11 of the ratchet 10 described above has an expansion surface portion 11B in each formation region in the circumferential direction in which the first region 13A and the third region 13C described above are formed. As a state in which the one coupling region A4 is more widely applied to the side frame 2F toward the outer side in the radial direction than the one coupling region A4 in the circumferential formation region where the second region 13B is formed. It is designed to be welded firmly.

Specifically, in the above-mentioned welding of the outer surface of the disk body 11 of the ratchet 10 to the side frame 2F, each dowel 14 is enclosed in a C shape from the outer region in the radial direction to both side regions in the circumferential direction. It is performed in a form in which a weld bead can be inserted (welded portion W). The operation pin 5A passed through the through hole 11A formed in the central portion (position on the central axis C) of the ratchet 10 described above can be passed through the side frame 2F described above to the outside in the axial direction. The through hole 2Fb is formed through the through hole.

<< About Guide 20 >>
As shown in FIG. 5, in the guide 20, one metal plate member is cut into a substantially disk-like shape having an outer diameter slightly larger than that of the ratchet 10 described above, and the plate thickness direction (axis) is obtained in some places. The structure is formed by half-cutting in the direction).

Specifically, on the outer peripheral edge portion of the disk main body 21 of the guide 20 described above, a cylindrical portion 22 projecting in a substantially cylindrical shape in the axial direction, which is the direction of assembly to the ratchet 10, is formed. The cylindrical portion 22 is formed so that its inner diameter is slightly larger than the outer diameter of the cylindrical portion 12 of the ratchet 10 described above. As shown in FIG. 9, the above-mentioned guide 20 is set so that the above-mentioned cylindrical portion 12 of the ratchet 10 is inserted in the cylindrical portion 22 in the axial direction.

As a result, the guide 20 is assembled so that the ratchet 10 and the cylindrical portions 22 and 12 of each other are loosely fitted to each other in and out of the radial direction, and are supported in and out of each other so as to be relatively rotatable. It has become. Then, the above-mentioned guide 20 is mounted via the outer peripheral ring 60 in a state where the outer peripheral ring 60 described later is straddled from the outer peripheral side between the cylindrical portion 22 and the cylindrical portion 12 of the ratchet 10 described above. It is designed to be assembled to the ratchet 10 in a state where it is prevented from coming off in the axial direction (see FIGS. 2 to 3 and 6 to 9).

As shown in FIG. 5, on the inner surface of the disk main body 21 of the guide 20 described above, the guides 20 project substantially in a fan shape in the axial direction, which is the assembling direction to the ratchet 10, at three positions in the circumferential direction. The guide wall 23 is formed by being extruded in a semi-pulled shape. The guide walls 23 have a shape in which their radial outer peripheral surfaces are curved so as to draw concentric arcs drawn around the central portion (central axis C) of each other. Each of the guide walls 23 described above is set in a state of being loosely fitted in the cylindrical portion 12 of the ratchet 10 assembled in the cylindrical portion 22 of the guide 20 described above.

Due to the formation of each of the guide walls 23 described above, three poles 30 described later are placed inside and outside in the radial direction in the area between the arrangements of the guide walls 23 in the circumferential direction on the inner surface of the disk body 21 described above. A pole accommodating groove 24A that can be set so as to be slidable is formed. Further, in the central region on the inner surface of the disk body 21 surrounded by each of the guide walls 23 described above, a cam accommodating groove 24B capable of setting the rotary cam 40 described later in a shape that can be axially rotated is formed. ing.

As shown in FIGS. 10 to 11, each of the above-mentioned guide walls 23 has each of the corresponding poles 30 set in each of the above-mentioned pole accommodating grooves 24A in the circumferential direction facing each pole accommodating groove 24A. The regulation surface 23A, which is a side surface, is applied to face each other from both sides in the circumferential direction, and each pole 30 is supported from both sides in the circumferential direction so as to be guided so as to be slidable only inward and outward in the radial direction. It is said to be composed.

Further, each of the above-mentioned guide walls 23 faces the rotary cam 40 set in the above-mentioned cam accommodating groove 24B from the outside in the radial direction by the support surface 23B which is a radial inner peripheral surface facing the cam accommodating groove 24B. The outside of the radial direction so as to guide the rotary cam 40 to a shape that allows only circumferential rotation at the central portion (position on the central axis C) on the disk body 21 of the guide 20. It is said to be supported by.

Further, as shown in FIG. 5, on the inner surface of the disk main body 21 of the guide 20 described above, the main pole P1 is set so as to project in a columnar shape in the axial direction on the formation region of the pole accommodating groove 24A. A backlash filling pin 21C to be inserted into the wedge-shaped backlash filling hole 35 formed in the pole P1 is formed. As shown in FIG. 11, the above-mentioned backlash filling pin 21C has a wedge-shaped backlash filling when the above-mentioned main pole P1 is pulled inward in the radial direction and is disengaged from the meshing with the inner peripheral teeth 12A of the ratchet 10. It is located in the outer region of the hole 35 in the wide radial direction so as not to hinder the movement of the main pole P1.

However, as shown in FIG. 10, the play-filling pin 21C described above has a wedge shape of the main pole P1 as the main pole P1 is pushed outward in the radial direction and meshed with the inner peripheral teeth 12A of the ratchet 10. In the backlash filling hole 35, the hole width is narrowed to the inner region in the radial direction, and the main pole P1 can be switched to a state in which the backlash is suppressed in the circumferential direction. With the above configuration, the main pole P1 is meshed with the inner peripheral teeth 12A of the ratchet 10 in a state where the ratchet 10 is suppressed in the circumferential direction, and the ratchet 10 and the guide 20 are mutually suppressed in the circumferential direction via the main pole P1. It is designed to be locked to the state.

As shown in FIGS. 4 to 5, each of the guide walls 23 described above has an intermediate portion that leaves a peripheral edge of a protruding region that expands its shape in the circumferential direction and the radial direction, and is in the direction of assembly to the ratchet 10. A floating island-shaped bead portion 23C is formed, which is extruded in a half-pulled shape toward the side opposite to the axial direction. Due to the formation of the bead portions 23C, each guide wall 23 can be provided with each pole 30 without reducing the contact area with each pole 30 for supporting each pole 30 from both sides in the circumferential direction by the restricting surface 23A. It is configured to have high structural strength that can be firmly supported from both sides in the circumferential direction.

Further, in the central portion (position on the central axis C) of the disk main body 21 of the guide 20 described above, a through hole penetrating into a substantially round hole shape is set in a state where the lock spring 50 described later is housed inside. 21A is formed. The through hole 21A described above is formed with a hooking hole 21Aa that extends from a part of the hole shape toward the outside in the radial direction. In the hooking hole 21Aa, the outer end portion 52 of the lock spring 50 set in the through hole 21A described above is fitted in the axial direction and is set in a state of being integrally fixed in the circumferential direction. It has become.

As shown in FIG. 4, a dowel that protrudes on the outer surface of the disk body 21 of the guide 20 described above at three positions in the circumferential direction in a substantially cylindrical shape in the axial direction. 21B is formed. These dowels 21B are formed so as to be extruded one by one on the region corresponding to the back side of each of the pole accommodating grooves 24A described above on the outer surface of the disk body 21 described above.

As shown in FIG. 2, in the guide 20 having the above configuration, each dowel 21B protruding from the outer surface of the disk body 21 described above is fitted into each corresponding fitting hole 3F formed in the reclining plate 3F. By being welded together, it is firmly and integrally bonded to the reclining plate 3F. In the reclining plate 3F described above, the operation pin 5A passed through the through hole 21A formed in the central portion (position on the central axis C) of the guide 20 described above can be passed outward in the axial direction. The through hole 3Fb is formed through the through hole.

《◆ About Pole 30》
As shown in FIGS. 4 to 5, each of the three poles 30 has one metal plate member cut into a substantially rectangular shape and is half-cut in the plate thickness direction (axial direction) in places. It is said that the structure was formed. Specifically, in each of the poles 30 described above, the offset surface portion 30B forming the inner peripheral side region in the radial direction thereof is in the assembling direction to the ratchet 10 with respect to the main body surface portion 30A forming the outer peripheral side region. The shape is extruded in a semi-punched shape by approximately the thickness of the plate in the axial direction.

Further, a specific one of the above-mentioned three poles 30 has a shape partially different from that of the other two sub poles P2 as the main pole P1 and is functionally distinguished. The specific differences described above will be described in detail later.

As shown in FIGS. 10 to 11, each of the above-mentioned poles 30 is housed in each of the pole accommodating grooves 24A formed on the inner surface of the disk body 21 of the guide 20 described above. It is set in a shape. According to the above set, each pole 30 is supported on each of the pole accommodating grooves 24A from both sides in the circumferential direction by the regulation surface 23A of each guide wall 23 facing from both sides in the circumferential direction. It is provided as a supported state so that it can move only inward and outward in the radial direction along the line.

Specifically, as shown in FIG. 9, when the poles 30 described above are set in the pole accommodating grooves 24A described above, the main body surface portions 30A thereof are placed on the inner surface surface of the disk main body 21 of the guide 20. It is designed to be set in a shape that can be hit. As a result, in each pole 30, the inner peripheral teeth 12A of the cylindrical portion 12 of the ratchet 10 assembled in the cylindrical portion 22 of the guide 20 described above are radially outer positions of the main body surface portion 30A. It is designed to be set facing each other.

Further, the offset surface portion 30B of each pole 30 described above is set so as to be axially separated from the inner side surface of the disk body 21 of the guide 20 described above, and is axially separated from the intermediate cylindrical portion 13 of the ratchet 10 described above. The arrangement of is set to overlap.

As shown in FIG. 4, on the radial outer peripheral surface of the main body surface portion 30A of each pole 30 described above, outer peripheral teeth 31 having the tooth surface facing outward in the radial direction are continuously arranged over the entire circumferential direction. It is formed as. The radial outer peripheral surface on which the outer peripheral teeth 31 of each pole 30 are formed is formed into a curved surface shape along the inner peripheral surface of the cylindrical portion 12 on which the inner peripheral teeth 12A of the ratchet 10 are formed. ing.

According to the above configuration, the outer peripheral teeth 31 of each pole 30 are pressed against the inner peripheral teeth 12A of the ratchet 10 from the inside in the radial direction, so that the whole is meshed with the inner peripheral teeth 12A of the ratchet 10. Specifically, the outer peripheral teeth 31 of each pole 30 are configured such that the tooth surfaces are arranged at equal intervals at a pitch of 2 degrees in the circumferential direction, similarly to the inner peripheral teeth 12A of these meshing ratchets 10. ing.

However, more strictly speaking, the outer peripheral teeth 31 of each of the poles 30 described above have a shape in which the central tooth surface in the circumferential direction thereof meshes most deeply with the inner peripheral teeth 12A of the ratchet 10, respectively, with reference to FIG. It is formed in a shape in which the tooth length becomes smaller so that the ratchet 10 enters into the inner peripheral teeth 12A of the ratchet 10 gradually becomes shallower toward both ends in the circumferential direction.

According to the above configuration, each pole 30 has a tooth surface at a central portion where the tooth surface faces straight in the traveling direction thereof, and the direction in which the tooth surface faces from the central portion toward both ends in the circumferential direction is different from the traveling direction. Other tooth surfaces that are tilted in the direction can also be properly meshed with the tooth surface of the inner peripheral tooth 12A of the corresponding ratchet 10 by moving each pole 30 radially outward. It has become. Since the specific tooth surface shape of the outer peripheral tooth 31 is the same as that disclosed in documents such as JP-A-2015-29635, detailed description thereof will be omitted.

According to the above configuration, when the outer peripheral teeth 31 are meshed with the inner peripheral teeth 12A of the ratchet 10, each pole 30 is engaged with the deepest of them by the action of a force pressed from the inside in the radial direction. With the central part in the circumferential direction as the fulcrum, the configuration is such that the whole may be subjected to the action of a biased force such that the whole is pushed and tilted in either of the circumferential directions. However, the above-mentioned action is that when the main pole P1 meshes with the ratchet 10, the backlash filling pin 21C provided in the guide 20 is pushed into the wedge-shaped backlash filling hole 35 and is loosely packed in the circumferential direction. Is properly deterred by.

As shown in FIG. 9, each of the above-mentioned poles 30 will be described later set in the central portion (position on the central axis C) of the guide 20 in the inner region in the radial direction surrounded by the main body surface portion 30A. The rotary cam 40 is set so as to face each other in the radial direction. According to the above set, each pole 30 is provided with their main body surface portions 30A arranged side by side at positions outside the radial direction of the rotary cam 40, and their offset surface portions 30B are vertically overlapped with the rotary cam 40. It is designed to be provided.

Here, as shown in FIG. 5, the inner peripheral surface portion of the main body surface portion 30A of each of the above-mentioned poles 30 faces the above-mentioned rotary cam 40 in the radial direction, and is radially along with the rotation of the rotary cam 40. A pressed surface portion 32 that receives an acting force that is pressed from the inside to the outside is formed. Further, in the intermediate portion of the offset surface portion 30B of each of the poles 30 described above, the corresponding pull-in pins 42 formed on the rotary cam 40 described above are inserted in the axial direction, and are radially along with the rotation of the rotary cam 40. A lead-in hole 33, which is operated so as to be pulled inward, is formed so as to penetrate in the axial direction. Further, in the intermediate portion of the main body surface portion 30A of each of the poles 30 described above, a riding protrusion 34 extruded in a semi-pulled shape in the same axial direction as the offset surface portion 30B is formed.

As shown in FIG. 10, the pressed surface portion 32 of each of the poles 30 described above is in the counterclockwise direction shown by the spring urging force of the lock spring 50 described later in which the rotary cam 40 described above is engaged with the guide 20. By being rotated in the same direction, the corresponding pressing portions 44 formed on the outer peripheral surface portion of the same rotating cam 40 are pressed from the inside to the outside in the radial direction. By the above pressing, the outer peripheral teeth 31 are pressed against the inner peripheral teeth 12A of the ratchet 10 described above to be engaged with each other, and are held in the same meshed state. As a result, each pole 30 is integrally coupled to the ratchet 10 in the circumferential direction, and the relative rotation between the ratchet 10 and the guide 20 is locked via each pole 30. Specifically, the ratchet 10 and the guide 20 are locked to each other in a shape in which the ratchet 10 and the guide 20 are loosely packed in the radial direction through the radial engagement of the poles 30 described above.

Further, as shown in FIG. 11, the lead-in hole 33 of each of the poles 30 described above is directed in the clockwise direction as shown by the rotary cam 40 described above against the spring urging force of the lock spring 50 by the operation of the reclining lever 5 described above. By being turned, it is pulled inward in the radial direction by the pull-in pin 42 of the corresponding rotary cam 40 inserted inside them. By the pulling-in, the outer peripheral teeth 31 are disengaged from the meshing state with the inner peripheral teeth 12A of the ratchet 10 described above, and are held in the disengaged state (unlocked state). It has become. As a result, the rotation lock state between the ratchet 10 and the guide 20 described above is released.

Further, as shown in FIG. 9, the riding protrusion 34 of each of the above-mentioned poles 30 is extruded in a semi-pulled shape to the same position in the same axial direction as the offset surface portion 30B of each of the above-mentioned poles 30, and the outer circumference thereof. The surface portion 34A is provided so as to face the inner peripheral surface of the intermediate cylindrical portion 13 of the ratchet 10 described above in the radial direction. As shown in FIGS. 10, 17 (a) and 18 (a), the riding protrusion 34 of each of the above-mentioned poles 30 has the rotation position of the ratchet 10 with respect to the guide 20 in the above-mentioned state of the lock region A1. At one point, even if each of the poles 30 described above is pushed outward in the radial direction by the rotary cam 40, it is not pressed against the inner peripheral surface of the intermediate cylindrical portion 13 of the ratchet 10, and each pole 30 is the inner circumference of the ratchet 10. It is designed not to hinder the movement of meshing with the tooth 12A.

However, as shown in FIGS. 13, 17 (b) and 18 (b), the above-mentioned riding protrusion 34 of each pole 30 has the above-mentioned rotation position of the ratchet 10 with respect to the guide 20 in the above-mentioned free region A2. By being changed to the state, when each of the poles 30 described above is pushed out radially outward by the rotary cam 40, it is pressed against the inner peripheral surface of the intermediate cylindrical portion 13 of the ratchet 10. Therefore, the movement of each pole 30 to mesh with the inner peripheral teeth 12A of the ratchet 10 is stopped at an intermediate position.

Specifically, the riding protrusion 34 of each pole 30 described above has a diameter from the central portion (position on the central axis C) of the guide 20 to the outer peripheral surface portion 34A of the main pole P1 and the other two sub poles P2. It is configured so that the dimensions, that is, the formation positions in the radial direction are different from each other. Specifically, the riding protrusion 34 of the main pole P1 is formed at a position protruding outward in the radial direction from the riding protrusion 34 of the other two sub poles P2.

As shown in FIGS. 10, 17 (a) and 18 (a), the riding protrusion 34 of the main pole P1 described above is the first region 13A (lock region A1) of the intermediate cylindrical portion 13 of the ratchet 10 described above. ) And in the circumferential direction, even if it is pushed out in the radial direction by the rotary cam 40, it is not pushed out to the position where it rides on the first region 13A, and the main pole P1 is inside the ratchet 10. It does not hinder the movement of meshing with the peripheral teeth 12A.

At that time, the riding protrusions 34 of the other two sub-poles P2 are also formed at positions radially inside the riding protrusions 34 of the main pole P1 described above, so that the first one described above is described. Even if the arrangement is such that the second region 13B and the third region 13C (other region A3) projecting inward in the radial direction from the region 13A overlap each other in the circumferential direction, they are pushed out in the radial direction by the rotary cam 40. At that time, it is not pushed out to the position where it rides on the second region 13B and the third region 13C, and the movement of each sub pole P2 to mesh with the inner peripheral teeth 12A of the ratchet 10 is not hindered.

Further, as shown in FIGS. 13, 17 (b) and 18 (b), the riding protrusion 34 of the main pole P1 described above is the second region 13B (free) of the intermediate cylindrical portion 13 of the ratchet 10 described above. By being arranged so as to overlap the region A2) in the circumferential direction, the rotary cam 40 pushes it outward in the radial direction to ride on the second region 13B, and the main pole P1 rides on the inner peripheral teeth 12A of the ratchet 10. It is designed to stop the movement of meshing with the ratchet at the middle position.

However, even at that time, even if the riding protrusions 34 of the other two sub-poles P2 are arranged to overlap with the corresponding third region 13C and the first region 13A (other region region A3) in the circumferential direction, respectively. When the rotary cam 40 is pushed outward in the radial direction, it is not pushed out to the position where it rides on the third region 13C and the first region 13A, and the sub-pole P2 is moved outward in the radial direction on the way. It is designed not to stop at the position.

Even in such a configuration, each sub-pole P2 is stopped from moving outward in the radial direction of the main pole P1 at an intermediate position, whereby the rotation of the rotary cam 40 is stopped and the rotation of the rotary cam 40 is further stopped in the radial direction. Since it is not pushed outward, it is held in an unlocked state in which the ratchet 10 is prevented from being pressed against the inner peripheral teeth 12A together with the main pole P1. Each of the climbing protrusions 34 formed on the two sub-poles P2 described above has an inclined surface 34B having a chamfered shape formed at a corner portion on one end side in the circumferential direction on the outer peripheral surface portion 34A. There is.

As shown in FIGS. 13, 17 (b) and 18 (b), each of the inclined surfaces 34B described above has a free region A2 (second region 13B) in which the riding protrusion 34 of the main pole P1 described above is the ratchet 10. ), And the ratchet 10 is in the free area without operating the reclining lever 5 from the state where the riding protrusion 34 of each sub pole P2 is located on the third area 13C and the first area 13A, respectively. When the seat back 2 is turned in the direction of returning from A2 to the lock area A1 (when the seat back 2 is raised to the rear side), the riding protrusions 34 of each sub-pole P2 are formed on the first convex portions 13D and the second above-mentioned. It functions as a relief portion for allowing the ratchet to get over in the circumferential direction while escaping to the outside in the radial direction by guiding the convex portion 13E in the circumferential direction so as not to abut against the convex portion 13E.

Further, as shown in FIGS. 4 to 5, in the main body surface portion 30A of the main pole P1 described above, the intermediate portion deviating from the forming region of the riding protrusion 34 in the circumferential direction is directed from the outside to the inside in the radial direction. A backlash filling hole 35 is formed that penetrates the hole so that the hole shape is tapered. As shown in FIG. 11, the backlash filling hole 35 described above is a backlash filling pin 21C protruding from the inner side surface of the disk body 21 of the guide 20 when the above-mentioned main pole P1 is set on the guide 20. Is set to be inserted in the hole. According to the above set, when the play-filling hole 35 is in the unlocked state before the main pole P1 described above meshes with the inner peripheral teeth 12A of the ratchet 10, the play-filling pin 21C described above is placed in the outer hole width in the radial direction. When it is located in a wide area, it does not hinder the movement of the main pole P1.

However, as shown in FIG. 10, the backlash filling hole 35 is filled with the backlash as described above as the main pole P1 is pushed outward in the radial direction and meshed with the inner peripheral teeth 12A of the ratchet 10. The pin 21C is pressed into a region having a narrow hole width inside in the radial direction, so that the pin 21C can be switched to a state in which play is suppressed in the circumferential direction of the main pole P1. With the above configuration, the main pole P1 is meshed with the inner peripheral teeth 12A of the ratchet 10 in a state where the ratchet 10 is suppressed in the circumferential direction, and the ratchet 10 and the guide 20 are mutually suppressed in the circumferential direction via the main pole P1. It is designed to be locked to the state.

By the way, as shown in FIGS. 4 to 5 and 19 to 20, each of the poles 30 described above has a main body surface portion such that the offset surface portion 30B and the riding protrusion 34 are arranged radially apart from each other. It is formed by being separately extruded in a semi-punch shape in the same axial direction with respect to 30A. At that time, the offset surface portion 30B of each pole 30 is an outer peripheral surface portion in which the precision control surface Q that gives accuracy to the molded surface formed by the half punching process is extruded in the shape of the half punching so that the surface faces outward in the radial direction. It is set and formed on the inner peripheral surface portion (pressed surface portion 32) side of the main body surface portion 30A, which is formed so that the surface faces inward in the radial direction by half-cutting instead of on the side. With the above configuration, each pole 30 has a configuration in which the pressed surface portion 32 thereof is formed with high accuracy.

Further, the climbing protrusions 34 of each pole 30 have an outer peripheral surface portion where the quality control surface Q, which gives accuracy to the molded surface formed by the half punching process, is extruded in the shape of the half punching so that the surface faces outward in the radial direction. It is set and formed on the 34A side. With the above configuration, each pole 30 has a configuration in which the outer peripheral surface portion 34A and the inclined surface 34B thereof are formed with high accuracy. In this way, each pole 30 is formed by separately extruding the offset surface portion 30B and the riding protrusion 34 described above with respect to the main body surface portion 30A so as to be aligned radially apart from each other. As described above, the quality control surface Q can be set on the front and back sides of the surface Q to obtain the accuracy of the molded surface.

In addition, in the pressed surface portion 32 of each of the poles 30 described above, in detail, each region deviated from the formation portion of the riding protrusion 34 on both sides in the circumferential direction is the corresponding pressing portion of the rotary cam 40 described in FIG. It is pressed from the inside in the radial direction by 44. Therefore, in reality, the pressed surface portion 32 of each pole 30 has the quality control surface Q set in the regions on both sides where the arrangement in the circumferential direction does not overlap with the riding protrusion 34, and the riding protrusion 34 and the circumferential direction are actually set. The quality control surface Q is not set in the area where the arrangements overlap. With the above configuration, even if the offset surface portion 30B of each pole 30 and the riding protrusion 34 are arranged so as to overlap each other in the circumferential direction, the quality control surface Q can be appropriately set for each and the molding can be performed in a good condition. It has become.

《◆ About rotating cam 40》
As shown in FIG. 5, the rotary cam 40 is formed by cutting one metal plate member into a substantially disk-like shape and half-cutting in some places in the plate thickness direction (axial direction). It is said that. The rotary cam 40 described above is set in a state of being housed in a cam accommodating groove 24B formed on the inner surface of the disk body 21 of the guide 20 described above.

As shown in FIG. 9, the above-mentioned rotary cam 40 has a shape having substantially the same plate thickness as each of the above-mentioned poles 30, and the inner surface of the disk body 21 of the above-mentioned guide 20 and each pole 30. It is in a state of being sandwiched between the offset surface portion 30B extruded in a semi-pulled shape in the axial direction of the pole 30 and surrounded by the main body surface portion 30A of each pole 30 from the outer peripheral side.

As shown in FIG. 5, at the central portion (position on the central axis C) of the rotary cam 40 described above, an operation pin 5A integrally connected to the reclining lever 5 described above in FIG. 1 is provided from the inside in the axial direction. A through hole 41 is formed which is inserted and integrally mounted in the rotation direction. The above-mentioned operation pin 5A is inserted through the through hole 41 of the above-mentioned rotary cam 40 from the inside to the outside in the axial direction, and after that, is integrally connected to the above-mentioned reclining lever 5 in FIG. Has been done. With the above configuration, the operation pin 5A integrally rotates the rotary cam 40 with the pulling operation of the reclining lever 5 described above.

The operation pin 5A described above is integrally connected to the operation pin 5A inserted into the seat reclining device 4 on the other side described above in FIG. 1 via a connecting rod 5B. With the above configuration, by the operation of pulling up the reclining lever 5 described above, the operation pin 5A on the other side is also integrally rotated, and the rotary cam 40 of the seat reclining device 4 on the same side is also integrally rotated. It has become like.

As shown in FIG. 5, the above-mentioned rotary cam 40 is formed in a substantially disk shape slightly larger than the through hole 21A formed in the central portion (position on the central axis C) of the above-mentioned guide 20. The two hook pins 43 are formed so as to project in the axial direction on the outer surface facing the through hole 21A of the guide 20. As shown in FIGS. 2 and 6, the inner end 51 of the lock spring 50, which will be described later, is hooked and integrally fixed to each of the above-mentioned hook pins 43 so as to be sandwiched between them. It has become. Further, on the inner side surface of each pole 30 of the rotary cam 40 described above facing the offset surface portion 30B, three retractable pieces are set so as to be inserted into the corresponding lead-in holes 33 formed in each pole 30. The pin 42 is formed so as to protrude in the axial direction.

The rotary cam 40 described above is assembled to the guide 20 described above in a state of being elastically supported by a lock spring 50. That is, the rotary cam 40 has a lock spring 50 between the hook pins 43 protruding from the outer surface facing the through hole 21A of the guide 20 from the state set in the cam accommodating groove 24B of the guide 20 described above. The lock spring 50 is hooked into the through hole 21Aa of the guide 20 so that the inner end 51 is hooked and the outer end 52 of the lock spring 50 is hooked into the hooking hole 21Aa extending from the through hole 21A of the guide 20. By being set in the 21A, it is assembled in a state of being elastically supported by the guide 20 via the lock spring 50.

By the above assembly, as shown in FIG. 9, the rotary cam 40 is axially between the disk body 21 of the guide 20 and the offset surface portion 30B extruded in a semi-pulled shape in the axial direction of each pole 30. It is supported as a sandwiched state, and in the radial direction, it is provided in a form surrounded from the outside in the radial direction by the pressed surface portion 32 which is the inner peripheral surface portion of the main body surface portion 30A of each pole 30. ing.

Then, the rotary cam 40 described above is constantly counterclockwise to the guide 20 by the spring urging force of the lock spring 50 (see FIGS. 2 and 6) engaged with the guide 20 described above. It is said to be in a state of being rotationally urged in the clockwise direction. Due to the rotation in the counterclockwise direction due to the urging, the rotary cam 40 has the pressed surface portion 32 of each pole 30 in the radial direction by the pressing portions 44 formed so as to project at a plurality of locations in the circumferential direction on the outer peripheral surface portion thereof. It is designed to be pushed out from the inside to the outside.

Further, as shown in FIG. 11, the rotary cam 40 described above is shown to be on the opposite side to the urging direction described above via the operation pin 5A when the reclining lever 5 described above is pulled up in FIG. It is rotated clockwise. As a result, in the rotary cam 40, the lead-in pins 42 inserted into the lead-in holes 33 of the poles 30 move in the circumferential direction in the lead-in holes 33 and outward in the radial direction of the lead-in holes 33. Depending on the changing shape, each pole 30 is operated so as to be pulled inward in the radial direction.

Specifically, as shown in FIG. 10, the above-mentioned rotary cam 40 pushes each pole 30 from the inside in the radial direction by the rotational force due to the spring urging force of the lock spring 50 to mesh with the inner peripheral teeth 12A of the ratchet 10. In the state (locked state), the inner end portion 51 of the lock spring 50 hooked on the hook pin 43 is located on the upper left side and the upper right side of the three guide walls 23 formed on the guide 20. It is designed to be positioned in the circumferential region between the two guide walls M1.

In the above state, the rotary cam 40 has a spring urging force received from the inner end portion 51 of the lock spring 50, and in addition to the rotational urging force in the counterclockwise direction shown in the figure, the eccentric urging force toward the outside in the radial direction. It is supposed to be in an acted state. Nevertheless, the rotary cam 40 is in a state of being centered at the center of the guide 20 (position on the central axis C) with the support from each pole 30 when each pole 30 meshes with the inner peripheral teeth 12A of the ratchet 10. It is supposed to be held as.

However, as shown in FIG. 11, the above-mentioned rotary cam 40 is rotationally operated in the clockwise direction shown against the spring-forced force of the above-mentioned lock spring 50, and each pole 30 is operated to rotate the inner peripheral teeth 12A of the ratchet 10. As shown in FIG. 16, due to the eccentric urging action received from the inner end portion 51 of the lock spring 50 described above by being disengaged from the meshing state with the above-mentioned two guide walls M1, the inner peripheral side of the two guide walls M1 described above. While being pressed against the support surface 23B of the above, the two guide walls M1 are slid on the support surface 23B so as to be rotated in the clockwise direction shown in the figure. At that time, unlike the other two guide walls M1, the remaining guide wall M2 is formed so that a slight radial gap T is set between the guide wall M2 and the outer peripheral surface of the rotary cam 40 described above. There is.

With such a configuration, as shown in FIG. 16, the rotary cam 40 is axially displaced (eccentric direction) in the two guide walls M1 to which the rotary cam 40 is pressed by the urging action of the lock spring 50. ), But the rotary cam 40 properly escapes the movement when the shape of the other guide wall M2 remaining at the fulcrum is rattled in a certain direction. Therefore, the rotary cam 40 can be smoothly slid and rotated in the release direction without being eccentric.

<< ◆ About the outer ring 60 >>
As shown in FIGS. 4 to 5, in the outer peripheral ring 60, one thin plate material is punched out in a ring shape, and the outer peripheral portion of the punched out hollow disk has a cylindrical shape in the plate thickness direction (axial direction). By being drawn into a protruding shape, it is formed into a substantially cylindrical shape with a hollow disk-shaped seat. As a result, the outer peripheral ring 60 includes a hollow disk-shaped flange portion 62 whose surface faces straight in the axial direction, and a coupling portion 61 which projects axially in a substantially cylindrical shape along the outer peripheral edge portion of the flange portion 62. It is said that the configuration has.

Specifically, the above-mentioned outer peripheral ring 60 is extruded from the outer peripheral portion of the flange portion 62 in a shape in which the above-mentioned outer peripheral ring 60 protrudes in two stages in the axial direction, so that the above-mentioned outer peripheral ring 60 is pushed out from the joint portion 61 to the inner peripheral side of the joint portion 61. It is also configured to have a stepped cylindrical shape having a cylindrical shape with two steps inside and outside, in which a step portion 63 that is short in the axial direction and protrudes in a substantially cylindrical shape is formed. In the outer peripheral ring 60 described above, three poles 30, a rotary cam 40, and a lock spring 50 are set on the guide 20 described above, and a ratchet 10 is assembled, and then these assembled units are set inside a cylinder to form a joint portion 61. Is welded to the guide 20 so that the ratchet 10 and the guide 20 are mounted so as to straddle the outer peripheral portions of the guide 20.

Specifically, the above-mentioned outer peripheral ring 60 is assembled so that the above-mentioned units are sequentially inserted into the inside of the cylinder from the ratchet 10, so that the stepped portion 63 thereof is the above-mentioned guide 20 as shown in FIGS. 9 and 15. It is set in a state of being abutted against the cylindrical portion 22 in the axial direction, and the above-mentioned flange portion 62 is in a state of covering the above-mentioned cylindrical portion 12 of the ratchet 10 from the outside in the axial direction. Then, along with the above setting, the cylindrical portion 22 of the guide 20 described above is set in a state of being fitted in the axial direction in the cylindrical coupling portion 61 of the outer peripheral ring 60 described above.

Then, after the above-mentioned set, the above-mentioned coupling portion 61 of the outer peripheral ring 60 is laser-welded from the outer peripheral side to the cylindrical portion 22 of the guide 20 fitted therein and integrally coupled to the outer peripheral ring 60. Is mounted so as to straddle between the outer peripheral portions of the ratchet 10 and the guide 20. By the above mounting, the outer peripheral ring 60 is in a state of being integrally connected to the above-mentioned guide 20, and the flange portion 62 causes the ratchet 10 to greatly rattle in the axial direction and the radial direction with respect to the guide 20. It is designed to be held as if it were not.

Specifically, in the outer peripheral ring 60 described above, the corner portion of the flange portion 62 protruding inward in the radial direction is formed on the outer surface portion in the axial direction between the intermediate cylindrical portion 13 and the cylindrical portion 12 of the ratchet 10. The shape is attached to the inclined surface 13G whose surface is directed diagonally to the outer side in the radial direction, and the ratchet 10 is held in a state of suppressing rattling to the outer side in the axial direction and the outer side in the radial direction of the above-mentioned ratchet 10. It has become like.

More specifically, as shown in FIGS. 5 and 7, the above-mentioned outer peripheral ring 60 is crimped into a shape protruding inward in the axial direction formed in three regions in the circumferential direction of the above-mentioned flange portion 62. Each of the diagonal contact portions 62A projects so as to face diagonally outward in the axial direction and outward in the radial direction, which are formed in three regions in the circumferential direction on the inclined surface 13G of the ratchet 10 described above. Due to the rotational positional relationship in which the ratchet rides on each protruding inclined surface 13H, each oblique contact portion 62A abuts on each of the corresponding protruding inclined surfaces 13H, so that the ratchet 10 described above is axially outward and radial. It is possible to keep the ratchet on the outside as a more appropriately suppressed state.

In each of the diagonal contact portions 62A formed on the flange portion 62 of the outer peripheral ring 60 described above, the three regions in the circumferential direction of the flange portion 62 described above are on the outer side in the radial direction which is a joint with the step portion 63. It is formed by being crimped so as to be bent diagonally so that the inner end portion protrudes inward in the axial direction with the end portion as a base point. Further, each of the protruding inclined surfaces 13H formed in the three regions in the circumferential direction on the inclined surface 13G of the ratchet 10 described above is substantially parallel to the inclined surface 13G due to the mold shape pressed against the ratchet 10 during the half punching process. It is formed so as to project diagonally to the outside in the axial direction and the outside in the radial direction from the inclined surface 13G.

Each of the above-mentioned protruding inclined surfaces 13H is uniformly arranged and formed in a shape having a width length of about 20 degrees in the circumferential direction in three regions in the circumferential direction on the above-mentioned inclined surface 13G. .. Guided slopes 13H1 are formed on both side portions in the circumferential direction of each of the above-mentioned protruding inclined surfaces 13H so as to smooth the step between each protruding inclined surface 13H and the inclined surface 13G in an inclined manner. ing. Further, each diagonal contact portion 62A formed on the flange portion 62 of the outer peripheral ring 60 also has a width length of about 20 degrees in the circumferential direction in three regions on the flange portion 62 in the circumferential direction. It is shaped and evenly distributed.

As shown in FIG. 21, the outer peripheral ring 60 having the above configuration has the first-stage lock position S1 and the torso angle S2 (about 20 degrees) in which the backrest angle of the seat back 2 described above is an upright position standing straight on the upper side described above. ), As shown in FIGS. 22 to 23, the inclined surface of the ratchet 10 is formed on each oblique contact portion 62A formed in the three regions in the circumferential direction of the flange portion 62 described above. The corresponding protruding inclined surfaces 13H formed in the three regions on the 13G in the circumferential direction are overlapped in the circumferential direction, and the oblique contact portions 62A are mounted on the corresponding protruding inclined surfaces 13H. It is designed to be in contact with each other (contact area B1). Here, the torso angle S2 described above corresponds to the "angle used as a backrest" of the present invention.

As a result, the outer peripheral ring 60 is held in a state where the ratchet 10 is appropriately suppressed from rattling in the axial direction and the radial direction by each of the diagonal contact portions 62A described above. At that time, as shown in FIG. 24, the flange portion 62 of the outer peripheral ring 60 described above is in a non-contact state separated from the inclined surface 13G of the ratchet 10 described above without abutting. .. As shown in FIG. 21, the above-mentioned contact region B1 is an angle position in which the backrest angle of the seat back 2 is inclined forward by about 10 degrees from the upright position which is the above-mentioned first-stage lock position S1 and from the torso angle S2. It is set in an angle region of about 40 degrees between the angle position inclined to the rear side by about 10 degrees.

In the above-mentioned contact region B1, as shown in FIG. 22, the ratchet 10 is restrained from rattling by the outer peripheral ring 60 relatively strongly. Rotational movement with respect to the ratchet is likely to be suppressed. However, when the seat back 2 is in the upright angle region as described above, the urging force of the return spring 6 (see FIG. 1) that urges the seat back 2 in the forward rotation direction acts relatively strongly. The seat back 2 can be smoothly rotated and moved even if the backlash is packed as described above.

Further, as shown in FIG. 25, when the backrest angle of the seat back 2 described above is moved from the contact region B1 shown in FIG. 21 to an angle region deviated rearward from the outer peripheral ring 60 described above, As shown in FIGS. 26 to 27, the inclined surface 13G of the ratchet 10 is superposed on each of the diagonal contact portions 62A formed in the three regions of the flange portion 62 in the circumferential direction, respectively. It is in a non-contact state in which a slight gap is formed between the oblique contact portion 62A and the inclined surface 13G of the ratchet 10 (non-contact region B2). At that time, as shown in FIG. 28, the flange portion 62 of the outer peripheral ring 60 also has a partial region thereof overlapped with each protruding inclined surface 13H of the ratchet 10 in the circumferential direction, but each protruding inclined surface It is designed to be in a non-contact state separated from the 13H without contacting it.

In the above region, it becomes difficult for the ratchet 10 to suppress backlash by the outer peripheral ring 60, but the ratchet 10 can be smoothly rotated and moved with respect to the guide 20 by that amount. Therefore, when the seat back 2 is in the angle region tilted backward as described above, the urging force of the return spring 6 (see FIG. 1) that urges the seat back 2 in the forward rotation direction acts relatively weakly. Even in such an area, the seat back 2 can be smoothly raised to the front side.

Further, as shown in FIG. 29, the outer peripheral ring 60 described above is also when the backrest angle of the seat back 2 described above is moved from the contact region B1 shown in FIG. 21 to an angle region deviating to the front side. As shown in FIGS. 30 to 31, the inclined surface 13G of the ratchet 10 is superposed on each of the diagonal contact portions 62A formed in the three regions of the flange portion 62 in the circumferential direction, respectively. It is in a non-contact state in which a slight gap is formed between the oblique contact portion 62A and the inclined surface 13G of the ratchet 10 (non-contact region B2). At that time, as shown in FIG. 32, the flange portion 62 of the outer peripheral ring 60 also has a partial region thereof overlapped with each protruding inclined surface 13H of the ratchet 10 in the circumferential direction, but each protruding inclined surface It is designed to be in a non-contact state separated from the 13H without contacting it.

Even in the above region, it becomes difficult for the ratchet 10 to suppress backlash by the outer peripheral ring 60, but the ratchet 10 can be smoothly rotated and moved with respect to the guide 20 by that amount. Therefore, when the seat back 2 is in the angle region tilted forward as described above, the force for raising the seat back 2 in the rear direction is large, but even in such a region, the seat back 2 can be relatively smoothly moved. Can be raised to the rear.

《■ Summary》
Summarizing the above, the seat reclining device 4 of this embodiment has the following configuration. That is, it is a vehicle seat reclining device (4), which is provided between the ratchet (10) and the guide (20) and the ratchet (10) and the guide (20), which are vertically assembled so as to be able to rotate relative to each other. A lock mechanism (30, 40) that locks these relative rotations, and an outer circumference that is mounted across the outer circumference of the ratchet (10) and the guide (20) and holds them in an axially assembled state. It has a ring (60) and. An outer ring (60) is formed between the coupling portion (61) coupled to one (20) of the ratchet (10) and the guide (20) and the other (10) with respect to the other (10). It has an oblique contact portion (62A) that is obliquely abutted from the outside in the axial direction and the outside in the radial direction by the slanted contact structure. The diagonal contact structure is the contact region (B1) where the diagonal contact portion (62A) is applied to the other (10) in the rotation range of the ratchet (10) with respect to the guide (20), and the diagonal contact portion. (62A) has a non-contact region (B2) that is separated from the other (10).

With such a configuration, the slanted contact structure appropriately causes the ratchet (10) and the guide (20) to rattle in the axial direction and the radial direction of the other (10) with respect to one (20). Can be suppressed to. Specifically, due to the configuration in which the oblique contact structure has a contact region (B1) and a non-contact region (B2), the outer ring (60) is included in the rotation region of the ratchet (10) with respect to the guide (20). Two areas are set: an area that suppresses ratcheting between the ratchet (10) and the guide (20), and an area that allows ratcheting and makes the rotation of the ratchet (10) smoother. can do.

Further, the ratchet (10) has a lock region (A1) in which the relative rotation lock by the lock mechanism (30, 40) is effective in the rotation range with respect to the guide (20), and the lock mechanism (30, 40). It has a free area (A2) in which the relative rotation lock is invalid. The contact region (B1) in the oblique contact structure is a rotation region including the lock position (S1) of the first stage that has entered the lock region (A1) from the free region (A2) of the ratchet (10). With such a configuration, the radial backlash between the ratchet (10) and the guide (20) when the ratchet (10) is used at the lock position (S1) of the first stage is appropriately set. It can be suppressed.

Further, the oblique contact structure has a protruding inclined surface (13H) protruding from a part of the circumferential direction of the other (10) so as to face the surface diagonally to the outside in the axial direction and the outside in the radial direction, and the outer peripheral ring. The diagonal contact portion (62A) formed so as to project inward in the axial direction and / or inward in the radial direction from a part of the circumferential region of (60) is overlapped with each other in the circumferential direction. It is said that it is configured to be. With such a configuration, the outer peripheral ring (60) and the other (10) have an oblique contact structure having a region for suppressing rattling between the ratchet (10) and the guide (20) and an allowable region. ) And can be embodied by a simple configuration in which a structure protruding from each partial region is provided.

Further, the protruding inclined surface (13H) formed on the other (10) and the oblique contact portion (62A) formed on the outer peripheral ring (60) are evenly arranged at a plurality of locations in the circumferential direction, and each of them is arranged. The rotation of the ratchet (10) with respect to the guide (20) simultaneously switches between the contact state and the non-contact state. With such a configuration, the ratchet (10) and the guide (20) can be prevented from rattling in the radial direction in a well-balanced manner by the diagonal contact structure which is evenly arranged in the circumferential direction. Can be done.

Further, the other side (10) that is in contact with the diagonal contact portion (62A) described above is a ratchet (10). With such a configuration, the outer ring (60) can appropriately suppress the ratchet (10) from rattling in the radial direction with respect to the guide (20).

Further, the diagonal contact portion (62A) has a corner contact structure in which the corner portion extending inward in the radial direction is brought into contact with the other (10). With such a configuration, the diagonal contact portion (62A) of the outer peripheral ring (60) can be diagonally applied to the other (10) without forming a shape that extends long in the axial direction. It can be configured.

Further, the oblique contact portion (62A) covers the other (10) formed on the outer peripheral ring (60) with a ring shape connecting from the outside in the axial direction to the circumferential direction from a plurality of locations in the circumferential direction of the flange portion (62). It is formed as a bent portion that protrudes inward in the axial direction in a crimped shape. With such a configuration, the diagonal contact portion (62A) is configured to have a high structural strength so as to protrude from a part of the ring-shaped flange portion (62) connected to the outer peripheral ring (60) in an endless manner. This makes it possible to appropriately suppress radial backlash with respect to the guide (20) of the ratchet (10).

Further, the contact region (B1) in the oblique contact structure is a rotation range in which the seat back (2) has an angle (S2) used as a backrest. With such a configuration, it is possible to appropriately suppress the radial rattling between the ratchet (10) and the guide (20) when the seat back (2) is used as a backrest. , The locked state when the seat back (2) is used as a backrest can be made more stable.

<< ■ About other embodiments >>
Although the embodiment of the present invention has been described above with reference to one embodiment, the present invention can be implemented in various forms other than the above-mentioned embodiment. For example, the vehicle seat reclining device of the present invention can be applied to seats other than the right seat of an automobile, and is also used for vehicles other than automobiles such as railroads, and various vehicles such as aircraft and ships. It can be widely applied to seats. In addition, the seat reclining device for vehicles connects the seat back to a state in which the backrest angle can be adjusted with respect to the seat cushion, and also the seat back to the base such as a bracket fixed to the vehicle body side. It may be connected so that the angle can be adjusted.

Further, the vehicle seat reclining device may be configured such that the ratchet is connected to a member on the side fixed to the vehicle body such as a seat cushion, and the guide is connected to the seat back. Further, the plurality of poles constituting the locking mechanism of the vehicle seat reclining device may be provided by arranging two or four or more in the circumferential direction. The arrangement of the poles in the circumferential direction is not limited to those that are evenly arranged, and may be arranged in a one-sided manner.

In addition, the cam that operates to push each pole outward in the radial direction is a type that pushes each pole outward in the radial direction by rotation, and the radial direction that intersects the slide direction with each pole by sliding in the radial direction. It may be a type of configuration that slides so as to be pushed out (see JP-A-2015-227071). The operation of pulling each pole back inward in the radial direction may be performed by a member separate from the cam such as a release plate (see the same publication).

Further, as shown in each of the above embodiments, the diagonal contact portion of the outer peripheral ring has a configuration in which the outer peripheral ring abuts on the inclined surface formed on the ratchet and has a diagonal contact relationship, and the outer peripheral ring has a ratchet. An inclined surface may be brought into contact with any of the corners to form an oblique contact. Further, the diagonal contact portion of the outer peripheral ring may have an oblique contact relationship by bringing the inclined surface facing the inclined surface into contact with the inclined surface formed on the ratchet. Further, the outer peripheral ring may be configured such that the connecting portion is coupled to the ratchet and the oblique contact portion is obliquely applied to the guide from the outside in the axial direction and the outside in the radial direction.

Further, the diagonal contact portion of the outer peripheral ring may be configured to be easily elastically deformed by being separated in the circumferential direction by inserting slits at a plurality of points in the circumferential direction. Further, the connecting portion of the outer peripheral ring may be one that is welded and connected to one of the ratchet and the guide, and may be configured to be connected by caulking. Further, as shown in FIG. 33, the diagonal contact portion of the outer peripheral ring is formed as an oblique contact portion 62B that projects straight inward in the radial direction from a partial region in the circumferential direction of the outer peripheral ring 60. May be good. Further, the diagonal contact portion of the outer peripheral ring may be formed in a shape protruding inward in the radial direction, or may be formed in a shape protruding inward in the radial direction and inward in the axial direction. There may be.

1 Seat 2 Seat back 2F Side frame 2F Fitting hole 2Fb Through hole 3 Seat cushion 3F Reclining plate 3F Fitting hole 3Fb Through hole 4 Seat reclining device (seat reclining device for vehicles)
5 Reclining lever 5A Operation pin 5B Connecting rod 6 Return spring 10 Ratchet (other)
11 Disk body 11A Through hole 11B Expansion surface 12 Cylindrical part 12A Inner peripheral tooth 13 Intermediate cylindrical part 13A First area 13B Second area 13C Third area 13D First convex part 13E Second convex part 13F Relief Recessed 13G Inclined surface 13H Protruding inclined surface 13H1 Guided slope A1 Lock area A2 Free area A3 Other area A4 Bonding area 14 Dowel W Welding point B1 Contact area B2 Non-contact area S1 First stage lock position S2 Torso angle (used as backrest Angle to be done)
20 guides (one side)
21 Disk body 21A Through hole 21Aa Insertion hole 21B Dowel 21C Backlash filling pin 22 Cylindrical part 23 Guide wall 23A Restriction surface 23B Support surface 23C Bead part M1 Guide wall M2 Guide wall T Gap 24A Pole accommodating groove 24B Cam accommodating groove 30 Pole (Lock mechanism)
30A Main body surface 30B Offset surface 31 Outer tooth 32 Pressed surface 33 Pull-in hole 34 Riding protrusion 34A Outer surface 34B Inclined surface 35 Backlash filling hole P1 Main pole P2 Sub pole Q Quality control surface 40 Rotating cam (lock mechanism)
41 Through hole 42 Pull-in pin 43 Hook pin 44 Pressing part 50 Lock spring 51 Inner end 52 Outer end 60 Outer ring 61 Coupling part 62 Flange part 62A Diagonal contact part 62B Diagonal contact part 63 Step part C Central axis

Claims (7)

It is a seat reclining device for vehicles,
Ratchets and guides that are axially assembled so that they can rotate relative to each other,
A locking mechanism provided between the ratchet and the guide to lock these relative rotations,
It has an outer peripheral ring that is mounted across the outer peripheral portion of the ratchet and the guide and holds them in an axially assembled state.
The outer peripheral ring has a coupling portion that is coupled to one of the ratchet and the guide, and a flange portion that is provided so as to cover the other from the outside in the axial direction .
A protruding inclined surface is formed in a partial region in the other circumferential direction so as to face diagonally to the outside in the axial direction and outward in the radial direction, and a shaft is formed in a partial region in the circumferential direction of the flange portion. An oblique contact portion is formed that projects inward in the direction and / or inward in the radial direction, and the protruding inclined surface and the oblique contact portion are formed by the rotation of the ratchet with respect to the guide in the rotation region of the ratchet with respect to the guide. A contact region in which the arrangement in the circumferential direction with the contact portion overlaps and the ratchet is suppressed from rattling in the axial and radial directions with respect to the guide of the ratchet due to the contact between the protruding inclined surface and the diagonal contact portion, and the above. A vehicle seat reclining device in which a non-contact area in which the overlap of the arrangement of the protruding inclined surface and the oblique contact portion in the circumferential direction is removed and the suppression of rattling is released is set . The vehicle seat reclining device according to claim 1.
The ratchet has a lock region in which the relative rotation lock by the lock mechanism is effective and a free region in which the relative rotation lock by the lock mechanism is invalid in the rotation region with respect to the guide.
A vehicle seat reclining device in which the contact region is a rotation region including a first-stage lock position that enters the lock region from the free region of the ratchet. The vehicle seat reclining device according to claim 1 or 2.
The protruding inclined surface formed on the other side and the oblique contact portion formed on the outer peripheral ring are evenly arranged at a plurality of locations in the circumferential direction, and each of them is simultaneously rotated by the rotation of the ratchet with respect to the guide. A vehicle seat reclining device that can be switched between a contact state and a non-contact state . The vehicle seat reclining device according to any one of claims 1 to 3.
A vehicle seat reclining device in which the other side, which is in contact with the diagonal contact portion, is the ratchet . The vehicle seat reclining device according to any one of claims 1 to 4.
A vehicle seat reclining device having a corner contact structure in which the diagonal contact portion abuts a corner portion extending inward in the radial direction with the protruding inclined surface formed on the other side . The vehicle seat reclining device according to any one of claims 1 to 5.
A vehicle seat reclining device in which the diagonal contact portion is formed as a bent portion that protrudes in the shape of being crimped inward in the axial direction from a plurality of locations in the circumferential direction of the flange portion of the outer peripheral ring . The vehicle seat reclining device according to any one of claims 1 to 6.
A vehicle seat reclining device in which the contact area is a rotation range at an angle at which the seat back is used as a backrest .

Images