JP2021088294A - Vehicular seat reclining device - Google Patents

Abstract

To provide a vehicular seat reclining device configured so that an engagement state of a pole hardly collapses.SOLUTION: A seat reclining device 4 comprises: a ratchet 10 and a guide 20 that are assembled in an axial direction to be rotatable relatively to each other; a pole 30 which is supported from both sides in a rotating direction by a pair of guide walls 23 provided in the guide 20, and pushed and moved to outside in a radial direction to engage an inner tooth 12A of the ratchet 10 with outer teeth 31 so as to lock relative movement of the ratchet 10 and the guide 20; and a rotary cam 40 that pushes and moves the pole 30 from inside to outside in the radial direction. The pole 30 has a protrusion part 31A that protrudes partially in a shape different from general surfaces of tooth surfaces from both tooth surfaces of one of the outer teeth 31 to come into line-contact with corresponding tooth surfaces of the inner tooth 12A.SELECTED DRAWING: Figure 34

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 inclination angle of the seat back.

As a vehicle seat reclining device, a configuration including a substantially disk-shaped ratchet and guide assembled in the axial direction so as to be able to rotate relative to each other and a lock mechanism for locking these relative rotations is known ( Patent Document 1). The locking mechanism is configured to lock the relative rotation between the ratchet and the guide by pressing a plurality of poles set on the guide against the internal teeth formed on the outer peripheral portion of the ratchet and engaging them.

U.S. Pat. No. 9,139,113

If each pole tilts in the gap with respect to the guides that support them from both sides in the rotational direction, the meshing state of the ratchet with respect to the internal teeth may be disrupted. Therefore, the present invention provides a vehicle seat reclining device in which the meshed state of the pole is not easily broken.

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

That is, the present invention is a vehicle seat reclining device, which is supported from both sides in the rotation direction by a ratchet and a guide assembled in the axial direction so as to be able to rotate relative to each other and a pair of guide walls provided on the guide. A pole that locks the relative rotation between the ratchet and the guide by engaging the outer teeth with the inner teeth of the ratchet by the movement pushed outward in the radial direction, and a cam that pushes the pole from the inside to the outside in the radial direction. Has. The pole has a protrusion that partially protrudes from both tooth surfaces of one tooth of the external tooth in a shape different from the general surface of each tooth surface and makes line contact with each corresponding tooth surface of the internal tooth.

According to the above configuration, the outer teeth of the pole are in contact with the inner teeth of the ratchet with both protruding portions in contact with each other. Therefore, even if the pole is tilted in the rotational direction with respect to the guide, the outer teeth should be brought into contact with both the internal teeth of the ratchet in the rotational direction to mesh with the ratchet in a loosely packed state in both the rotational directions. Can be done.

Further, the present invention may be further configured as follows. A plurality of poles are provided side by side in the rotation direction, and one of them is pushed and moved by a cam to tilt in the rotation direction between the pair of guide walls and hit both of the pair of guide walls to loosen the backlash in the rotation direction. It is said to be the main pole with a structure. A protrusion is provided on the main pole.

According to the above configuration, by providing the protruding portion on the main pole having the backlash-filling structure in the rotation direction with respect to the guide, the contact portion of each protruding portion with respect to the internal teeth of the ratchet is less likely to fluctuate. Therefore, the outer teeth of the pole can be more appropriately meshed with the inner teeth of the ratchet in a state of being loosely packed in the rotational direction.

Further, the present invention may be further configured as follows. The outer teeth of the pole have a tooth surface shape in which the depth of penetration into the inner teeth gradually decreases from the center of the rotation direction toward both outer sides. Protrusions are formed on each tooth surface of the central tooth in the direction of rotation of the external tooth.

According to the above configuration, among the outer teeth of the pole, the outer teeth of the pole are more appropriately rotated in the direction of rotation with respect to the inner teeth of the ratchet by providing the protrusion in the central tooth that penetrates deepest into the inner teeth of the ratchet. It can be meshed in a loosely packed state.

Further, the present invention may be further configured as follows. The protrusion makes line contact with each corresponding tooth surface of the internal tooth at a position on the pitch circle.

According to the above configuration, it is possible to secure a large arc tooth thickness on the pitch circle of the external teeth provided with the protrusions.

It is a perspective view which showed the schematic structure of the vehicle seat to which the vehicle seat reclining device which concerns on 1st 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 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 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 the 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. It is sectional drawing which showed the state that the ratchet was turned to the start position of the lock area. 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 by each of 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 which showed the angle adjustment range of a seat back. FIG. 21 is an inner 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 the side view which showed the state which the seat back was pushed back from the torso angle. FIG. 25 is an inner side view showing a state of the vehicle seat reclining device in FIG. 25. FIG. 26 is a cross-sectional view taken along the line XXVII-XXVII of FIG. FIG. 26 is a cross-sectional view taken along the line XXVIII-XXVIII of FIG. It is the side view which showed the state which the seat back was moved forward from the torso angle. FIG. 29 is an inner 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 an enlarged view of XXXIII part of FIG. It is an enlarged view of the XXXIV part of FIG. 10 showing the meshing state of a specific pole with respect to the ratchet in an enlarged manner. It is sectional drawing corresponding to FIG. 34 which showed the meshing state in which the 1st protrusion touched a guide wall. FIG. 35 is a cross-sectional view showing a state in which the ratchet is rotated in the counterclockwise direction shown in the drawing from FIG. 35 to a position where the second protrusion hits the guide wall. It is an enlarged view of the XXXVII part of FIG. 34. It is an enlarged view corresponding to FIG. 37 which showed the tooth surface shape of the external tooth which concerns on 2nd Embodiment. It is an enlarged view corresponding to FIG. 37 which showed the tooth surface shape of the external tooth which concerns on 3rd Embodiment.

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

(First Embodiment)
<< About the outline configuration of the seat reclining device (seat reclining device for vehicles) 4 >>
First, the configuration of the seat reclining device 4 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 37. 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 sheet 1 described later.

As shown in FIG. 1, the seat reclining device 4 according to the present embodiment is applied to the seat 1 forming the right seat of the automobile. The seat reclining device 4 is configured as a reclining adjusting mechanism that connects the seat back 2 forming the backrest portion of the seat 1 to the seat cushion 3 forming the seating portion so that the angle can be adjusted. Specifically, the seat reclining device 4 is provided between the seat back 2 and the seat cushion 3 in pairs on the left and right. Each of the seat reclining devices 4 is configured to fix or release the backrest angle of the seat back 2 by being switched to each of the lock / unlock states at the same time.

Specifically, as shown in FIGS. 2 to 3, the seat reclining device 4 includes the lower end portions of the side frames 2F forming the left and right side skeletons of the seat back 2 and the seats located outside these side frames in the seat width direction. It is interposed between each reclining plate 3F connected to the rear ends of the left and right lateral skeletons of the cushion 3, and these can be relatively rotated or stopped rotating coaxially with each other. It is connected.

As shown in FIG. 1, the seat reclining device 4 is always held in a locked state in which the backrest angle of the seat back 2 is fixed. In the seat reclining device 4, the reclining lever 5 provided on the side of the seat cushion 3 on the outside (right side) of the vehicle is pulled up by the user (circled number 1 in FIG. 1), and the locked states thereof are all at once. Will be released. As a result, the seat reclining device 4 is switched to an unlocked state in which the backrest angle of the seat back 2 can be adjusted in the front-rear direction of the seat. The seat reclining device 4 is returned to the locked state by urging when the operation of the reclining lever 5 described above is returned.

A return spring 6 that applies a spring-forced force in the direction of tilting forward and rotating the seat back 2 is hooked between the left and right side frames 2F of the seat back 2 and the reclining plates 3F located outside the seat back 2, respectively. Has been done. 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.

The backrest angle of the seat back 2 is freely adjusted back and forth according to the movement in which the back of the seated occupant is tilted back and forth (circled number 2 in FIG. 1). In this way, by setting the return spring 6 that exerts an urging force in the forward rotation direction on the seat back 2, the backrest angle of the seat back 2 can be easily adjusted. Specifically, as shown in FIG. 21, the seat back 2 is between the front tilt position Pa folded on the upper surface of the seat cushion 3 and the rear tilt position Pc tilted substantially horizontally to the rear side. The rotation region of about 180 degrees can be rotated in the front-rear direction of the seat.

In the structure for locking the seat back 2 to the forward tilted position Pa, each locking plate 2Fc coupled to the outer surface portion of each side frame 2F of the seat back 2 is formed so as to protrude from the front edge of each reclining plate 3F. It is composed of a structure that is locked by hitting each of the front stoppers 3Fc. Further, in the structure in which the seat back 2 is locked to the rearward tilting position Pc, each locking plate 2Fc coupled to the outer surface portion of each side frame 2F of the seat back 2 is attached to the rear edge of each reclining plate 3F. It has a structure in which it is locked by hitting each of the protruding rear stoppers 3Fd.

Here, in the above-mentioned rotation region of the seat back 2, the rotation region of about 90 degrees from the lock position Pb of the first stage in which the backrest angle of the seat back 2 stands up substantially vertically to the rearward tilt position Pc is the reclining lever. It is defined as the "lock area A1" in which the backrest angle of the seat back 2 is returned to a fixed state when the pulling operation of 5 is released. Further, in the rotation region where the backrest angle of the seat back 2 is about 90 degrees from the lock position Pb of the first stage to the forward tilt position Pa, the angle of the seat back 2 is fixed even if the pulling operation of the reclining lever 5 is released. It is defined as the "free area A2" that is held in the released state (the state in which the lock is invalidated) without being released.

The lock area A1 and the free area A2 described above are each composed of functions provided by the seat reclining device 4 described later. According to the setting of the free area A2, when the reclining lever 5 is operated while no person is sitting on the seat 1 and the seat back 2 is tilted forward to the position where it enters the free area A2, the reclining lever 5 is moved from there. Even if the operation is not continued, the vehicle can be tilted to the forward tilt position Pa without permission.

Specifically, as shown in FIGS. 2 to 3, the above-mentioned seat reclining device 4 is integrally coupled to the outer surface portion of the side frame 2F on each side of the seat back 2 (see FIG. 2). And a guide 20 (see FIG. 3) that is integrally coupled to the inner side surface portion of the reclining plate 3F on each side. The seat reclining device 4 has a configuration in which the ratchet 10 and the guide 20 are switched so as to lock or release the relative rotation of each other, thereby fixing or releasing the backrest angle of the seat back 2. Will be done.

<< About the configuration of each part of the seat reclining device 4 >>
Hereinafter, the configuration of each part of the pair of left and right seat reclining devices 4 will be described in detail. The seat reclining devices 4 have the same configuration so as to be symmetrical with each other. Therefore, on behalf of these, the configuration of the seat reclining device 4 arranged on the outside (right side) of the vehicle shown in FIGS. 2 to 3 will be described in detail below.

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 to each other in the axial direction, three poles 30 that are assembled between them, and these in the radial direction. It has a rotary cam 40 that moves in and out. Further, the seat reclining device 4 is mounted so as to straddle the lock spring 50 (spiral spring) that urges the rotary cam 40 with respect to the guide 20 in the rotation direction of the lock, and the outer peripheral portion between the ratchet 10 and the guide 20. It has a substantially cylindrical outer peripheral ring 60.

The outer peripheral ring 60 functions as a holding member that holds the ratchet 10 and the guide 20 in a state of being assembled to each other in the axial direction. Here, the rotary cam 40 corresponds to the "cam" of the present invention. The ratchet 10, the guide 20, the three poles 30, and the rotary cam 40 are each formed by press molding and then quenching to be hardened to increase the structural strength.

<< About Ratchet 10 >>
As shown in FIG. 4, the ratchet 10 has a shape in which one metal plate-like member is cut into a substantially disk-like shape, and some parts are extruded in a semi-extruded shape in the plate thickness direction (axial direction). It is said that the structure has been processed into. Specifically, the ratchet 10 has a stepped cylindrical portion protruding in two steps in the axial direction, which is the direction of assembly to the guide 20, on the outer peripheral edge of the disk main body 11. The structure is extruded and formed.

The cylindrical portion on the outer peripheral side of the stepped cylindrical portion is formed as a cylindrical portion 12 having internal teeth 12A formed on the entire inner peripheral surface. Further, the cylindrical portion on the inner peripheral side is formed as an intermediate cylindrical portion 13 having a shorter protrusion length in the axial direction than the cylindrical portion 12. The internal teeth 12A of the cylindrical portion 12 have a tooth surface shape capable of engaging each external tooth 31 formed on the outer peripheral surface portion of each pole 30 described later from the inside in the radial direction. Specifically, the internal teeth 12A have a shape in which the tooth surfaces are arranged at equal intervals at a pitch of 2 degrees in the rotation direction.

Further, on the inner peripheral surface portion of the intermediate cylindrical portion 13, three regions (first region 13A and second region 13B) in which the inner diameter dimension and the length in the rotation direction of the ratchet 10 from the rotation center C are individually set are set. And the third region 13C), and the first convex portion 13D and the second convex portion 13E protruding inward in the radial direction at the boundary between the regions are formed.

The first region 13A, the second region 13B, and the third region 13C are each formed in an arc-shaped curved inner peripheral surface shape drawn around the rotation center C of the ratchet 10. Specifically, as shown in FIG. 10, each of the first region 13A and the third region 13C has an inner peripheral surface shape having the same diameter and having an inner diameter dimension slightly larger than that of the second region 13B. ..

As shown in FIGS. 10, 17 (a) and 18 (a), the first region 13A has a rotation angle of the ratchet 10 with the main pole P1 which is one of the three poles 30 described later. When the arrangement is such that they overlap in the rotation direction, a lock region A1 that allows the main pole P1 to mesh with the internal teeth 12A is formed. At that time, the second region 13B and the third region 13C are respectively arranged so as to overlap the remaining two sub poles P2 in the rotational direction, and are set as relief regions A3 that allow the meshing of these sub poles P2 with the internal teeth 12A. Tooth.

On the other hand, as shown in FIG. 12, the second region 13B is shown in FIGS. 13, 17 (b) and 18 (b) when the rotation angle of the ratchet 10 overlaps with the main pole P1 in the rotation direction. As shown, a free region A2 is formed in which the engagement of the main pole P1 with the internal teeth 12A is stopped by riding on the inner peripheral surface. At that time, the third region 13C and the first region 13A are arranged so as to overlap the remaining two sub poles P2 in the rotational direction, respectively, and are set as escape regions A3 for allowing the movement of these sub poles P2 to escape.

That is, as shown in FIG. 10, the intermediate cylindrical portion 13 of the ratchet 10 allows the lock operation of the main pole P1 in the first region 13A, and as shown in FIGS. 12 to 13, the second portion 13 thereof. The lock operation of the main pole P1 is stopped in the region 13B. As shown in FIG. 10, each pole 30 is also allowed to lock the remaining two sub poles P2 when the lock operation of the main pole P1 is allowed. Further, as shown in FIGS. 12 to 13, each pole 30 is prevented from locking the main pole P1 so that the locking operation of the remaining two sub poles P2 is also stopped.

In this way, the intermediate cylindrical portion 13 of the ratchet 10 controls the locking allowance / blocking of the main pole P1 by the first region 13A and the second region 13B. Then, when the first region 13A functions as the lock region A1 (see FIG. 10), the other two regions (second region 13B and third region 13C) each have the remaining two subpoles P2. It functions as a relief area A3 that allows the lock operation of the. When the second region 13B functions as the free region A2 (see FIG. 13), the other two regions (first region 13A and third region 13C) are the remaining two subpoles P2, respectively. It functions as an escape area A3 to escape the movement of.

In the first convex portion 13D and the second convex portion 13E, as shown in FIGS. 17 (c) and 18 (c), the main pole P1 is locked in the lock region A1 (first region 13A) by the rotation of the ratchet 10. In the transition from the free region A2 (second region 13B) to the step between the first region 13A and the second region 13B in a state where the extrusion to the outside in the radial direction is halfway, the rotation direction The other two sub-poles P2 are formed at positions where they can be abutted at the same time in the rotational direction when they hit the ratchet. By abutting each of the sub poles P2 at the same time, the load received when the main pole P1 hits the step can be distributed to the other two sub poles P2.

Specifically, in the first convex portion 13D and the second convex portion 13E, the stepping protrusion 34 of the main pole P1 is a 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 abutted in the same rotational direction as the riding protrusions 34 of the remaining two sub poles P2 when they are abutted in the rotational direction. The configuration of each riding protrusion 34 will be described in detail later.

As shown in FIGS. 14, 17 (d) and 18 (d), the second convex portion 13E is located on the lock region A1 (first region 13A) on the starting end side in the rotational direction, that is, the lock region A1. It is formed so as to project from the free region A2 (second region 13B) of the above and the end portion on the opposite side to the adjacent side. As shown in FIG. 21, the second convex portion 13E is shown in FIGS. 14, 17 (d) and 18 (D) when the seat back 2 is tilted to the starting end of the lock region A1, that is, the rearward tilting position Pc. As shown in d), the main pole P1 is formed at a position where the riding protrusion 34 and the arrangement in the rotation direction can overlap.

The reason is as follows. That is, as shown in FIG. 21, when the seat back 2 is tilted to the rearward tilting position Pc, the above-mentioned locking plate 2Fc hits the rear stopper 3Fd of the reclining plate 3F and is locked. At that time, due to the installation of the seat reclining device 4 and its peripheral parts, the riding protrusion 34 of the main pole P1 shown in FIG. 14 is set before the locking plate 2Fc hits the rear stopper 3Fd of the reclining plate 3F. When it hits the second convex portion 13E in the rotation direction, a large load is applied to the seat reclining device 4. Therefore, in order to prevent such a situation from occurring, the second convex portion 13E is formed with a relief concave portion 13E1 that allows the abutment of the main pole P1 with the riding protrusion 34 in the rotational direction to escape.

As shown in FIG. 33, the relief recess 13E1 is formed so that the corner portion of the second convex portion 13E on the clockwise side in the drawing is substantially rectangular and lightened. In the relief recess 13E1, the seat back 2 is tilted to the rearward tilting position Pc as shown in FIG. 21 due to the dimensional variation due to the installation, and the locking plate 2Fc is locked by hitting the rear stopper 3Fd of the reclining plate 3F. At that time, even if the climbing protrusion 34 of the main pole P1 overlaps the second convex portion 13E in the rotation direction as shown in FIG. 33, the climbing protrusion 34 rotates with the second convex portion 13E. Accept it so that it does not hit in the direction. Specifically, the relief recess 13E1 accepts the riding protrusion 34 as a state in which a gap Y in the rotational direction is provided between the riding protrusion 34 and the side surface on the counterclockwise direction side shown in the drawing.

When the riding protrusion 34 of the main pole P1 that has entered the inside of the relief recess 13E1 is pushed out in the radial direction, the riding protrusion 34 is made to ride on the inner peripheral surface of the main pole P1. The engagement of the ratchet 10 of the pole P1 with the internal teeth 12A is prevented. As a result, it is prevented that the main pole P1 is locked at the position where the riding protrusion 34 of the main pole P1 escapes and enters the recess 13E1 (rotational position beyond the lock area A1).

As shown in FIGS. 4 to 5, a through hole 11A penetrating in a round hole shape is formed in the central portion (position on the rotation center C) of the disk body 11 of the ratchet 10. An operation pin 5A inserted into the through hole 11A at the center of the rotation cam 40 (position on the rotation center C), 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.

As shown in FIG. 3, the ratchet 10 is set 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, and the contact points with each other are welded. By doing so, it is integrally connected to the side frame 2F of the seat back 2. Specifically, in the ratchet 10, three dowels 14 formed so as to project on the outer surface of the disk body 11 correspond to three fitting holes 2F formed in the side frame 2F of the seat back 2. Each of them is fitted inside, and the outer surface of the disk body 11 is set in a state of being in surface contact with the outer surface of the side frame 2F.

Then, in the ratchet 10, the peripheral regions (bonding regions A4) of the fitting portions are laser-welded to the side frame 2F and coupled. As shown in FIG. 5, each dowel 14 is formed on each region in the rotation direction in which the first region 13A, the second region 13B, and the third region 13C of the intermediate cylindrical portion 13 are located. Has been done. Each dowel 14 is formed in an arc shape that curves around the rotation center C of the ratchet 10.

The radial outer region of each dowel 14 on the outer surface of the disk body 11 of the ratchet 10 is a coupling region A4 that is applied to the side frame 2F in a surface contact state and laser welded. As shown in FIG. 7, each coupling region A4 is formed at each location where the first region 13A and the third region 13C are located due to the uneven shape of the intermediate cylindrical portion 13 formed on their outer peripheral edges. The region A4 has an expansion surface portion 11B whose radial dimension is expanded as compared with the coupling region A4 where the second region 13B is located.

That is, as described above, the first region 13A and the third region 13C formed in the intermediate cylindrical portion 13 have a shape in which the diameter is expanded outward in the radial direction from the second region 13B. As a result, the joint region A4 at each location where the first region 13A and the third region 13C are formed has a radial dimension than the coupling region A4 at the location where the second region 13B is formed. Is an extended configuration. According to the above configuration, on the outer surface of the disk body 11 of the ratchet 10, two coupling regions A4 having expansion surface portions 11B at each location where the first region 13A and the third region 13C are formed are formed on the side frame 2F. It is designed to be firmly welded in a state where it is applied more widely to the outside in the radial direction.

Welding of the ratchet 10 to the side frame 2F is performed so that a welding bead is inserted so as to enclose each dowel 14 in a C shape from the outside in the radial direction across both side regions in the rotational direction. As shown in FIG. 3, the side frame 2F has a round hole-shaped through hole 11A formed at the center of the ratchet 10 (position on the rotation center C) at a position axially opposed to the through hole 11A. Hole 2Fb is formed. An operation pin 5A passed through the through hole 11A of the ratchet 10 is passed through the through hole 2Fb in the axial direction.

<< About Guide 20 >>
As shown in FIG. 5, in the guide 20, one metal plate-like member is cut into a substantially disk-like shape having an outer diameter slightly larger than that of the ratchet 10, and the guide 20 is cut in a portion in the plate thickness direction. The structure is processed so that it is extruded in a semi-extruded shape (in the axial direction). Specifically, the guide 20 is formed by extruding a cylindrical portion 22 that protrudes in a cylindrical shape in the axial direction, which is the assembling direction to the ratchet 10, from the outer peripheral edge portion of the disk main body 21 in a semi-pulled shape. It is composed.

The cylindrical portion 22 is formed so that its inner diameter dimension is slightly larger than the outer diameter dimension of the cylindrical portion 12 of the ratchet 10. Specifically, the cylindrical portion 22 has a configuration in which the wall thickness in the radial direction is formed to be thinner than the plate thickness of the outer peripheral ring 60 described later (see FIG. 15). More specifically, the cylindrical portion 22 has a configuration in which the wall thickness in the radial direction is reduced so that the outer peripheral surface thereof is located inside the outer peripheral surface of the step portion 63 of the outer peripheral ring 60 described later in the radial direction. .. As shown in FIG. 9, the guide 20 is set so that the cylindrical portion 12 of the ratchet 10 is loosely fitted in the cylindrical portion 22 in the axial direction.

As a result, the guide 20 is assembled in a state in which the cylindrical portions 22 and 12 of the ratchet 10 and the cylindrical portions 22 and 12 are loosely fitted inside and outside in the radial direction, and are supported inside and outside so as to be relatively rotatable with each other. .. Then, the guide 20 is attached to the ratchet 10 via the outer peripheral ring 60 by mounting the outer peripheral ring 60, which will be described later, between the cylindrical portion 22 and the cylindrical portion 12 of the ratchet 10. It is assembled in a state where it is fixed 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, a guide wall that protrudes in a substantially fan shape in the axial direction, which is the assembling direction to the ratchet 10, at three positions in the rotation direction. 23 is formed by being extruded in a half-pulled shape. The outer outer peripheral surfaces of the guide walls 23 in the radial direction are curved so as to draw an arc on the same circumference drawn around the rotation center C of the guide 20. Each guide wall 23 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.

By forming each of the guide walls 23, on the inner side surface of the disk main body 21 of the guide 20, three poles 30 described later are placed one by one in the radial direction in the area between the arrangements of the guide walls 23 in the rotational direction. A concave pole accommodating groove 24A that can be set so as to be slid only inside and outside the above is formed. Further, in the central region on the inner surface of the disk body 21 surrounded by each guide wall 23, a cam accommodating groove 24B is formed in which the rotary cam 40 described later can be set in an axially rotatable shape. ..

As shown in FIGS. 10 to 11, each guide wall 23 has a corresponding pole 30 set in each pole accommodating groove 24A on both side surfaces in a rotation direction facing each pole accommodating groove 24A. Each regulatory surface 23A supports from both sides in the direction of rotation. As a result, each guide wall 23 is in a state of being guided from both sides in the rotation direction so that each pole 30 can be slid only inward and outward in the radial direction.

Further, each guide wall 23 supports the rotary cam 40 set in the cam accommodating groove 24B from the outside in the radial direction by the support surface 23B which is the inner peripheral surface in the radial direction facing the cam accommodating groove 24B. As a result, each guide wall 23 is in a state where the rotary cam 40 is guided from the outside in the radial direction so as to be rotatable at a substantially center (rotation center C) position on the disk body 21 of the guide 20.

Further, in the central portion (position on the rotation center C) of the disk body 21 of the guide 20, a substantially round hole-shaped through hole 21A in which the lock spring 50 described later is set is formed so as to penetrate in the axial direction. Has been done. The through hole 21A is formed with a hooking hole 21Aa that extends the hole shape outward in the radial direction. In the hooking hole 21Aa, the outer end 52 of the lock spring 50 set in the through hole 21A is fitted in the axial direction and is set in an integral state in the rotational direction.

As shown in FIG. 2, the guide 20 is set so that the outer surface of the disk body 21 is in surface contact with the inner surface of the reclining plate 3F, and the contact points are welded to each other. It is integrally connected to the reclining plate 3F. Specifically, in the guide 20, the three dowels 21B formed so as to project on the outer surface of the disk body 21 are fitted into the corresponding three fitting holes 3F formed in the reclining plate 3F, respectively. The outer surface of the disk body 21 is set so as to be in surface contact with the inner surface of the reclining plate 3F.

Then, in the guide 20, the peripheral regions of the fitting portions are laser-welded to the reclining plate 3F and joined to each other. As shown in FIG. 4, each dowel 21B was extruded in an axially floating island shape on the area behind each pole accommodating groove 24A (see FIG. 5) on the outer surface of the disk body 21. It is formed in a shape. As shown in FIG. 2, the reclining plate 3F has a round hole-shaped through hole 21A formed at the center of the guide 20 (position on the rotation center C) at a position axially opposed to the through hole 21A. The hole 3Fb is formed. The operation pin 5A, which is passed through the through hole 21A of the guide 20, is passed through the through hole 3Fb in the axial direction.

<< About Paul 30 >>
As shown in FIGS. 4 to 5, in each of the three poles 30, one metal plate-like member is cut into a substantially rectangular shape, and some parts are half in the plate thickness direction (axial direction). The structure is processed so that it is extruded in a punched shape. Specifically, each pole 30 is assembled to the ratchet 10 with respect to the main body surface portion 30A in which the offset surface portion 30B forming the substantially inner half region in the radial direction forms the substantially outer half region in the radial direction. The shape is extruded in a half-pulled shape by approximately the thickness of the plate in the axial direction.

The above three poles 30 have substantially the same shape, but one of them is a main pole P1 and has a configuration having a function different from that of the other two sub poles P2. The specific configuration will be described in detail later. Hereinafter, a specific configuration of each part common to each pole 30 will be described.

As shown in FIGS. 10 to 11, each pole 30 is set in a state of being housed in each pole accommodating groove 24A formed on the inner side surface of the disk body 21 of the guide 20. To. According to the above set, each pole 30 is supported in a plane shape from both sides in the rotation direction by the regulation surface 23A of each guide wall 23 facing each pole accommodating groove 24A from both sides in the rotation direction. As a result, each pole 30 is supported so as to be movable only inward and outward in the radial direction along these regulation surfaces 23A.

Specifically, as shown in FIG. 9, when each pole 30 is set in each pole accommodating groove 24A (see FIG. 5), their main body surface portions 30A are on the inner surface surface of the disk main body 21 of the guide 20. It is set in contact with. As a result, each pole 30 is in a state in which the internal teeth 12A of the cylindrical portion 12 of the ratchet 10 set in the cylindrical portion 22 of the guide 20 face each other in the radial direction at a position outside the radial portion of the main body surface portion 30A. Is set to. Further, the offset surface portion 30B of each pole 30 is set in a state of being axially separated from the inner side surface of the disk body 21 of the guide 20, so that the arrangement in the axial direction overlaps with the intermediate cylindrical portion 13 of the ratchet 10. It is set.

As shown in FIG. 4, on the outer outer peripheral surface of the main body surface portion 30A of each pole 30 in the radial direction, external teeth 31 having the tooth surface facing outward in the radial direction are continuously arranged over the entire area in the rotational direction. Is formed in. The outer peripheral surface of each pole 30 on which the outer teeth 31 are formed has a convex curved surface shape that curves along the inner peripheral surface shape of the cylindrical portion 12 on which the inner teeth 12A of the ratchet 10 are formed.

The outer teeth 31 of each pole 30 have a shape in which the tooth surfaces are arranged at equal intervals at a pitch of 2 degrees in the rotation direction, similarly to the internal teeth 12A of these meshing ratchets 10. With the above configuration, as shown in FIG. 10, the external teeth 31 of each pole 30 are pushed into the internal teeth 12A of the ratchet 10 from the inside in the radial direction, so that the entire teeth 31 are meshed with the internal teeth 12A. There is. However, strictly speaking, as shown in FIG. 34, the outer teeth 31 of each pole 30 mesh with each other so that the central tooth surface in the direction of rotation penetrates the inner teeth 12A of the ratchet 10 most deeply, and rotates from there. The tooth height is reduced so that the penetration into the internal tooth 12A gradually becomes shallower toward both ends in the direction.

As a result, when each pole 30 meshes with the internal teeth 12A of the ratchet 10, even if it is pushed straight outward in the radial direction, all the tooth surfaces of the external teeth 31 do not stick to the tooth surfaces of the internal teeth 12A. , It can be properly meshed with the internal tooth 12A. That is, the outer teeth 31 of each pole 30 are configured such that the tooth surface at the center thereof is directed straight toward the traveling direction of the meshing movement.

However, the other tooth surfaces arranged from the central tooth surface of the external tooth 31 toward both ends in the rotational direction are configured such that the tooth surfaces are oriented obliquely in the rotational direction with respect to the central tooth surface. Therefore, when each pole 30 is pushed outward in the radial direction, the central tooth surface advances straight toward the corresponding tooth surface of the internal tooth 12A of the ratchet 10, while the other teeth of the internal tooth 12A It will enter at an oblique angle toward the corresponding tooth surface.

However, as described above, the tooth surface of the external tooth 31 has a shape in which the tooth height gradually decreases from the central tooth surface toward the tooth surfaces on both ends in the rotation direction, so that the central tooth has a shape. Even if the tooth surface other than the surface enters the tooth surface of the internal tooth 12A at an oblique angle, the state where the tooth surface enters the tooth surface of the internal tooth 12A without being abutted against the tooth surface of the internal tooth 12A (meshing state). Can be taken. Since the tooth surface shape of the external tooth 31 is the same as that disclosed in documents such as JP-A-2015-29635, detailed description thereof will be omitted.

As shown in FIG. 9, in the region on the inner peripheral side of the main body surface portion 30A of each pole 30, a rotary cam 40, which will be described later, set in the central portion of the guide 20 is set so as to face each other in the radial direction. According to the above set, each pole 30 is provided in a state where each main body surface portion 30A faces the rotary cam 40 in the radial direction and each offset surface portion 30B faces the rotary cam 40 in the axial direction.

As shown in FIG. 5, the inner peripheral surface portion of the main body surface portion 30A of each pole 30 faces the above-mentioned rotary cam 40 in the radial direction, and as the rotary cam 40 rotates, it goes from the inside to the outside in the radial direction. The pressed surface portion 32 to be pressed is formed. Further, in the intermediate portion of the offset surface portion 30B of each pole 30, each lead-in pin 42 formed at each corresponding portion of the rotary cam 40 is inserted in the axial direction, and is radially oriented as the rotary cam 40 rotates. A lead-in hole 33 that is operated so as to be pulled inward is formed so as to penetrate in the axial direction. Further, a riding protrusion 34 is formed in the middle portion of the main body surface portion 30A of each pole 30 so as to project in the same direction as the pushing direction of the offset surface portion 30B.

As shown in FIG. 10, the pressed surface portion 32 of each of the poles 30 described above is rotated in the counterclockwise direction shown by the spring urging force of the lock spring 50 in which the rotary cam 40 is engaged with the guide 20. As a result, the corresponding pressing portions 44 formed on the outer peripheral surface portion of the rotating cam 40 are pressed from the inside to the outside in the radial direction. As a result, each pole 30 is held in that state (locked state) when its external teeth 31 are pressed against the internal teeth 12A of the ratchet 10 and meshed with each other.

As a result, each pole 30 is integrally coupled to the ratchet 10 in the rotation direction, and the relative rotation between the ratchet 10 and the guide 20 is locked via each pole 30. Further, the ratchet 10 and the guide 20 are locked in a state in which the ratchet 10 and the guide 20 are loosely packed with each other in the radial direction through the meshing of each pole 30 due to the radial pressing.

Further, as shown in FIG. 11, the lead-in hole 33 of each pole 30 is rotated in the clockwise direction shown by the rotary cam 40 against the spring urging force of the lock spring 50 by the operation of the reclining lever 5. It is pulled inward in the radial direction by each corresponding pull-in pin 42 of the rotary cam 40. As a result, each pole 30 is held in that state (unlocked state) when its outer teeth 31 are disengaged from the meshing state with the internal teeth 12A of the ratchet 10. As a result, the rotation lock state between the ratchet 10 and the guide 20 is released.

Further, as shown in FIG. 9, the riding protrusion 34 of each pole 30 is extruded in an axial direction (right direction in the drawing) to a position substantially the same as the offset surface portion 30B of each pole 30, and the outer circumference thereof. The surface portion 34A is set so as to face the inner peripheral surface of the intermediate cylindrical portion 13 of the ratchet 10 in the radial direction. As shown in FIGS. 10, 17 (a) and 18 (a), the riding protrusions 34 of each of the poles 30 are in a state where the rotation position of the ratchet 10 with respect to the guide 20 is the lock region A1 described above. Even if each pole 30 is pushed outward in the radial direction by the rotary cam 40, each pole 30 meshes with the internal teeth 12A of the ratchet 10 without being pressed against the inner peripheral surface of the intermediate cylindrical portion 13 of the ratchet 10. Does not hinder the movement.

However, as shown in FIGS. 13, 17 (b) and 18 (b), the riding protrusion 34 of each pole 30 shifts the rotational position of the ratchet 10 with respect to the guide 20 to the state of the free region A2 described above. By doing so, each pole 30 is pushed outward in the radial direction by the rotary cam 40, and is pressed onto the inner peripheral surface of the intermediate cylindrical portion 13 of the ratchet 10, and each pole 30 is pressed against the inner teeth of the ratchet 10. Stop the movement of meshing with 12A on the way. Hereinafter, the above configuration will be described in detail.

The climbing protrusion 34 of each pole 30 has a radial dimension from the center of the guide 20 (position on the center of rotation C) to the outer peripheral surface portion 34A of the main pole P1 and the other two sub poles P2, 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 that protrudes more outward in the radial direction than 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 is the first region 13A (lock region A1) of the intermediate cylindrical portion 13 of the ratchet 10 described above. Even if it is pushed outward in the radial direction by the rotating cam 40, it is not pushed out to the position where it rides on the first region 13A, and the main pole P1 is pushed out with the internal teeth 12A of the ratchet 10. Does not interfere with the meshing movement.

At that time, even if the riding protrusions 34 of the other two sub-poles P2 are pushed outward in the radial direction by the rotary cam 40, the positions where they ride on the second region 13B and the third region 13C where they are located. It is not pushed out until, and each sub-pole P2 does not hinder the movement of meshing with the internal teeth 12A of the ratchet 10. That is, the two sub poles P2 are formed at positions inside the main pole P1 in the radial direction with respect to the riding projection 34. Therefore, the two sub-poles P2 overlap in the rotational direction with the second region 13B (relief region A3) and the third region 13C (relief region A3), which project inward in the radial direction from the first region 13A. Even if it is arranged, when it is pushed out by the rotary cam 40 in the radial direction, it is not pushed out to the position where it rides on the second region 13B and the third region 13C, respectively.

Further, as shown in FIGS. 13, 17 (b) and 18 (b), the riding protrusion 34 of the main pole P1 is the second region 13B (free region A2) of the intermediate cylindrical portion 13 of the ratchet 10 described above. ) And the rotation direction, the rotation cam 40 pushes it outward in the radial direction to climb onto the second region 13B, and the main pole P1 engages with the internal teeth 12A of the ratchet 10. Stop on the way.

At that time, the riding protrusions 34 of the other two sub-poles P2 may be arranged so as to overlap the corresponding third region 13C (relief region A3) and the first region 13A (relief region A3) in the rotational direction, respectively. When the rotary cam 40 pushes it outward in the radial direction, it is not pushed out to the position where it rides on the third region 13C (relief region A3) and the first region 13A (relief region A3), and each sub pole P2. It is designed not to stop the movement of the cam to the outside in the radial direction. Even with such a configuration, each sub-pole P2 is not pushed outward in the radial direction any more because the movement of the main pole P1 is stopped in the middle and the rotation of the rotary cam 40 is stopped in the middle. , The meshing movement of the ratchet 10 to the internal teeth 12A together with the main pole P1 is held as an unlocked state in which the meshing movement is blocked in the middle.

By the way, as shown in FIGS. 4 to 5 and 19 to 20, each pole 30 has a riding projection 34 and an offset surface portion 30B formed in a semi-pulled shape in the same axial direction from the main body surface portion 30A. It is extruded and formed. When molding the offset surface portion 30B of each pole 30, the accuracy control surface Q for giving accuracy to the molded surface is not on the outer peripheral surface portion of the offset surface portion 30B of each pole 30, but on the inner peripheral surface portion (covered) of the main body surface portion 30A. It is set on the pressing surface portion 32). As a result, each pole 30 has a structure in which the pressed surface portion 32 is formed with high accuracy.

Further, when molding the riding protrusions 34 of each pole 30, a precision control surface Q for giving accuracy to the molded surface is set on the outer peripheral surface portion 34A whose surface faces outward in the radial direction. .. As a result, each pole 30 has a configuration in which the outer peripheral surface portions 34A thereof are formed with high accuracy. As described above, each pole 30 is formed by extruding each offset surface portion 30B and the riding protrusion 34 from the main body surface portion 30A in a semi-extracted shape so as to be arranged so as to be spaced apart from each other in the radial direction. As described above, the quality control surface Q is set on the front and back sides of the surface Q so that the accuracy of the molded surface can be obtained.

In the pressed surface portions 32 of each of the poles 30, the regions deviated from the formed portions of the riding protrusions 34 on both sides in the rotational direction are radial by the corresponding pressing portions 44 of the rotary cam 40 described in FIG. It is configured to be pressed from the inside. Therefore, the pressure-pressed surface portion 32 of each pole 30 has the above-mentioned accuracy control surface Q set in the regions on both sides where the arrangement in the rotation direction does not overlap with the riding protrusion 34, and the riding protrusion 34 and the rotation direction are set. The accuracy control surface Q is not set in the area where the arrangements of the above are overlapped. With such a configuration, even if the offset surface portion 30B of each pole 30 and the riding protrusion 34 are arranged to overlap each other in the rotational direction, the accuracy control surface Q is appropriately set for each. The molded surface can be molded with high accuracy.

<< About the rotating cam 40 >>
As shown in FIG. 5, in the rotary cam 40, one metal plate-shaped member is cut into a substantially disk-like shape, and some parts are extruded in a half-pulled shape in the plate thickness direction (axial direction). The structure is processed into a shape. The rotary cam 40 is set in a state of being housed in a cam housing groove 24B formed on the inner side surface of the disk body 21 of the guide 20. As shown in FIG. 9, the rotary cam 40 has a shape having substantially the same plate thickness as each of the poles 30.

The rotary cam 40 is set so as to be sandwiched in the axial direction between the inner surface of the disk body 21 of the guide 20 and the offset surface portion 30B extruded in the axial direction of each pole 30 in a semi-extracted shape. As a result, the rotary cam 40 is set in a state of being covered 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.

As shown in FIG. 5, a through hole 41 in which the above-mentioned operation pin 5A is inserted from the inside in the axial direction and integrally connected in the rotation direction to the central portion (position on the rotation center C) of the rotation cam 40. Is formed. The operation pin 5A is inserted into the through hole 41 of the rotary cam 40 from the inside to the outside in the axial direction, and is integrally connected to the reclining lever 5 described in FIG. 1 after that. .. By the above assembly, the operation pin 5A integrally rotates the rotary cam 40 as the reclining lever 5 is pulled up.

The operation pin 5A is integrally connected to the operation pin 5A inserted into the seat reclining device 4 on the other side described in FIG. 1 via a connecting rod 5B. As a result, by the operation of pulling up the reclining lever 5, both operation pins 5A are rotated at the same time, and the rotary cams 40 of both seat reclining devices 4 are rotated at the same time.

As shown in FIG. 5, the rotary cam 40 is formed in a substantially disk shape slightly larger than the through hole 21A formed at the center of the guide 20 (position on the center of rotation C). The rotary cam 40 is formed with two hook pins 43 protruding in the axial direction toward the inside of the through hole 21A on the outer surface of the guide 20 facing the through hole 21A. As shown in FIGS. 2 and 6, the inner end 51 of the lock spring 50 is hooked and fixed to the hook pins 43 so as to be sandwiched between them. Further, as shown in FIG. 10, on the inner side surface of each pole 30 of the rotary cam 40 facing the offset surface portion 30B, a lead-in pin 42 that enters the lead-in hole 33 of each pole 30 projects in the axial direction. It is formed.

The rotary cam 40 is assembled to the guide 20 in a state of being elastically supported by a lock spring 50. Specifically, it is assembled by the following procedure. First, the rotary cam 40 is set in the cam accommodating groove 24B of the guide 20. Next, the lock spring 50 is set in the through hole 21A of the guide 20, the inner end 51 thereof is hooked between the hook pins 43 of the rotary cam 40, and the outer end 52 penetrates the guide 20. It is hooked in the hooking hole 21Aa extending from the hole 21A. As described above, the rotary cam 40 is assembled to the guide 20 in a state of being elastically supported by the lock spring 50.

The rotary cam 40 is brought into a state of being rotationally urged with respect to the guide 20 in the counterclockwise direction shown in FIG. 10 by the spring urging force of the lock spring 50 engaged with the guide 20. Due to the rotation by the urging, the rotary cam 40 always has the pressed surface portions 32 (see FIG. 9) of each pole 30 in the radial direction by the pressing portions 44 formed so as to project from a plurality of locations on the outer peripheral surface portion thereof. Each pole 30 is engaged with the internal teeth 12A of the ratchet 10 by pressing from the inside of the ratchet 10.

As shown in FIG. 11, the rotary cam 40 is rotated in the clockwise direction shown via the operation pin 5A by pulling up the reclining lever 5 described in FIG. 1. As a result, the rotary cam 40 pulls each pole 30 inward in the radial direction by each pull-in pin 42 inserted into the lead-in hole 33 of each pole 30, and is in a meshed state with the internal teeth 12A of the ratchet 10. It is designed to be removed from. Specifically, in the rotary cam 40, each lead-in pin 42 is pressed against a rising inclined surface on the inner peripheral edge side of each lead-in hole 33 by rotation in the clockwise direction shown in the drawing, and each pole 30 is pressed in the radial direction. It is designed to be pulled inward.

As shown in FIG. 10, the rotary cam 40 is hooked on each hook pin 43 in a state (locked state) in which each pole 30 is pushed out from the inside in the radial direction and meshed with the internal teeth 12A of the ratchet 10. The inner end 51 of the lock spring 50 is arranged in the rotation region between the two guide walls M1 on the upper left side in the drawing and the upper right side in the drawing among the three guide walls 23 formed on the guide 20. ing.

In that state, the rotary cam 40 is pushed outward in the radial direction in addition to the rotary urging force in the counterclockwise direction shown in the figure by the spring urging force received from the inner end portion 51 of the lock spring 50 in the eccentric direction. It is said that it has also received the urging force of. Nevertheless, the rotary cam 40 is centered at the center of the guide 20 (position on the center C of rotation) by receiving support from each pole 30 because the three poles 30 mesh with the internal teeth 12A of the ratchet 10. It is designed to be held as it is.

As shown in FIG. 11, the rotary cam 40 is rotated in the clockwise direction shown in the drawing, and each pole 30 is disengaged from the meshing state with the internal teeth 12A of the ratchet 10, so that the inside of the lock spring 50 is inside. As shown in FIG. 16, the support surface of the two guide walls M1 is pressed against the support surface 23B on the inner peripheral side of the two guide walls M1 by the eccentric urging force received from the end portion 51 of the guide wall M1. It is rotated in the clockwise direction shown in the figure so as to slide on 23B. At that time, the remaining guide wall M2 (guide wall M2 on the lower side in the drawing) does not come into contact with the outer peripheral surface of the rotary cam 40, unlike the other two guide walls M1, and the outer peripheral surface of the rotary cam 40. A slight radial gap T is formed between the two.

With such a configuration, it is appropriate not to move the rotary cam 40 in the axial deviation direction (eccentric direction) in the two guide walls M1 in which the rotary cam 40 is pressed by the spring urging force of the lock spring 50. Can be supported by. Moreover, the rotary cam 40 can appropriately escape the movement of the two guide walls M1 remaining on the fulcrum in the direction of the other guide wall M2. 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, the outer peripheral ring 60 is formed by punching a thin metal plate material into a ring shape and drawing the outer peripheral edge portion into a shape that protrudes in a cylindrical shape in the axial direction. Therefore, it is formed in a substantially cylindrical shape having a hollow disk-shaped seat (flange portion 62). Specifically, 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 protrudes substantially in a cylindrical shape in the axial direction from the outer peripheral edge portion of the flange portion 62. It is configured to have.

Specifically, the outer peripheral edge portion of the outer peripheral ring 60 is extruded into a stepped cylindrical shape in the axial direction so as to project in two stages. As a result, the cylindrical portion on the outer peripheral side of the stepped cylinder is formed as a substantially cylindrical joint portion 61, and the cylindrical portion on the inner peripheral side is a stepped portion having a shorter protrusion length in the axial direction than the joint portion 61. It is formed as 63.

The outer peripheral ring 60 is mounted so as to straddle between the outer peripheral portions of the ratchet 10 and the guide 20 as follows, and is assembled in a state in which they are prevented from coming off in the axial direction. First, three poles 30, a rotary cam 40, and a lock spring 50 are set on the guide 20. Next, the ratchet 10 is assembled to the guide 20, and these are set in the cylinder (inside the joint portion 61) of the outer peripheral ring 60.

Then, as shown in FIG. 15, the protruding end portion of the connecting portion 61 is crimped onto the outer surface of the cylindrical portion 22 of the guide 20 (caulking portion 61A). As described above, the connecting portion 61 of the outer peripheral ring 60 is integrally connected to the cylindrical portion 22 of the guide 20, and the flange portion 62 is in a state where the ratchet 10 is applied from the outside in the axial direction. As a result, the outer peripheral ring 60 is mounted so as to straddle the outer peripheral portion between the ratchet 10 and the guide 20, and is assembled in a state where they are prevented from coming off in the axial direction.

To explain the above assembly in more detail, the outer peripheral ring 60 is assembled in the cylinder (inside the joint portion 61) in the order of the ratchet 10 to the guide 20, so that the cylindrical portion 22 of the guide 20 is axially attached to the step portion 63. It is set in the state of being struck by. Then, the cylindrical portion 12 of the ratchet 10 is set on the flange portion 62 in a state where it is applied from the inside in the axial direction. Then, by the above setting, the cylindrical portion 22 of the guide 20 is set in a state in which the cylindrical portion 22 of the guide 20 is completely fitted in the cylindrical connecting portion 61 of the outer peripheral ring 60 in the axial direction.

Then, after the above set, the portion (caulking portion 61A) extending outward from the cylindrical portion 22 of the guide 20 of the connecting portion 61 of the outer peripheral ring 60 is bent inward in the radial direction to form the step. The cylindrical portion 22 of the guide 20 is crimped on the outer surface of the cylindrical portion 22 so as to be sandwiched between the portion 63 and the cylindrical portion 22 in the axial direction. As a result, the outer peripheral ring 60 is integrally coupled with the guide 20, and the ratchet 10 is applied from the outside in the axial direction by the flange portion 62 and is held so as not to come off in the axial direction.

Specifically, in the flange portion 62 of the outer peripheral ring 60, the tip portion protruding inward in the radial direction is formed on the outer surface portion in the axial direction of the portion connecting the intermediate cylindrical portion 13 and the cylindrical portion 12 of the ratchet 10. It is set so that it can be attached to the inclined surface 13G. The inclined surface 13G has a shape in which the surface is obliquely directed to the outside in the radial direction. Therefore, by attaching the tip portion of the flange portion 62 of the outer peripheral ring 60 onto the inclined surface 13G, ratchet 10 is suppressed from rattling outward in the axial direction and outward in the radial direction.

As shown in FIGS. 5 and 7, the flange portion 62 of the outer peripheral ring 60 is crimped at three positions in the rotational direction so as to project diagonally inward in the axial direction. Is formed. These oblique contact portions 62A are formed at three positions in the rotational direction on the inclined surface 13G of the ratchet 10, and each projecting inclination is formed so as to project the surface diagonally to the outside in the axial direction and the outside in the radial direction. When it is arranged so as to overlap the surface 13H in the rotational direction, it rides on each of the corresponding protruding inclined surfaces 13H. As a result of the riding, each of the oblique contact portions 62A is in a state in which ratchet 10 is more appropriately suppressed from rattling to the outside in the axial direction and to the outside in the radial direction.

Each of the diagonal contact portions 62A of the flange portion 62 is formed by partially bending the flange portion 62 diagonally inward in the axial direction with the joint with the step portion 63 as a base point. Further, each protruding inclined surface 13H formed on the inclined surface 13G of the ratchet 10 is formed so as to project substantially parallel to the inclined surface 13G due to the shape of the mold pressed against the ratchet 10 during the half punching process.

The protruding inclined surfaces 13H are evenly arranged at three positions on the inclined surface 13G in the rotational direction. Each protruding inclined surface 13H has a length in the rotation direction of about 20 degrees. Guided slopes 13H1 are formed on both side portions of each protruding inclined surface 13H in the rotational direction so as to connect the steps between the protruding inclined surfaces 13H and the inclined surface 13G in an inclined manner. Further, the diagonal contact portions 62A formed on the flange portion 62 of the outer peripheral ring 60 are also evenly arranged at three positions on the flange portion 62 in the rotational direction. Each of the oblique contact portions 62A also has a length in the rotation direction of about 20 degrees.

As shown in FIG. 21, the outer peripheral ring 60 has an angle region between the lock position Pb of the first stage in which the backrest angle of the seat back 2 is in a straight standing posture and the torso angle Pd (about 20 degrees). As shown in FIGS. 22 to 23, each of the corresponding protruding inclined surfaces 13H formed on the inclined surface 13G of the ratchet 10 rides on and abuts on each of the oblique contact portions 62A of the flange portion 62. (Abutment area B1).

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 oblique contact portions 62A. At that time, as shown in FIG. 24, the general surface of the flange portion 62 of the outer peripheral ring 60 is in a non-contact state in which the ratchet 10 is separated from the general surface of the inclined surface 13G. As shown in FIG. 21, the contact region B1 has an angle position in which the backrest angle of the seat back 2 is inclined forward by about 10 degrees from the lock position Pb (upright position) of the first stage and a rear side from the torso angle Pd. It is set in an angle region of about 40 degrees between the angle position inclined by about 10 degrees.

In the above-mentioned contact region B1, as shown in FIG. 22, the ratchet 10 is restrained from ratcheting by the outer peripheral ring 60 relatively strongly. Therefore, the ratchet 10 is guided by the action of the sliding frictional resistance force associated with the contact. Suppressive force is likely to be applied to the rotational movement with respect to 20. 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. Therefore, even if the backlash is strongly packed as described above, the seat back 2 can be smoothly rotated and moved.

Further, as shown in FIG. 25, in the outer peripheral ring 60, when the backrest angle of the seat back 2 shifts from the contact region B1 shown in FIG. 21 to an angle region deviated to the rear side, FIGS. 26 to 26 to As shown in FIG. 28, each protruding inclined surface 13H formed on the inclined surface 13G of the ratchet 10 deviates from the corresponding diagonal contact portion 62A of the flange portion 62 in the rotational direction. As a result, the outer peripheral ring 60 is in a non-contact state in which the inclined surface 13G of the ratchet 10 faces each other with a slight gap on each diagonal contact portion 62A of the flange portion 62 (non-contact). Area B2).

In the non-contact state, the ratchet 10 is weakened by the outer 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, even if the action of the urging force of the return spring 6 (see FIG. 1) that urges the seat back 2 in the forward rotation direction becomes relatively weak. , The seat back 2 can be smoothly raised to the front side.

Further, as shown in FIG. 29, the outer peripheral ring 60 also has a backrest angle of the seat back 2 transferred from the contact region B1 shown in FIG. 21 to an angle region deviated to the front side in FIG. 30. As shown in FIG. 32, each protruding inclined surface 13H formed on the inclined surface 13G of the ratchet 10 is displaced in the rotational direction from the corresponding oblique contact portions 62A of the flange portion 62. As a result, the outer peripheral ring 60 is in a non-contact state in which the inclined surface 13G of the ratchet 10 faces each other with a slight gap on each diagonal contact portion 62A of the flange portion 62 (non-contact). Area B2).

In the non-contact state, the ratchet 10 is weakened by the outer 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 forward tilted angle region as described above, the seat back 2 is raised relatively smoothly to the rear side even if the force for raising the seat back 2 in the rear direction is increased. be able to.

<< About the backlash packing structure of the main pole P1 >>
By the way, as shown in FIG. 34, when the main pole P1 described above is pressed by the rotary cam 40 and meshes with the internal teeth 12A of the ratchet 10, it is slightly pulled between the guide walls 23 on both sides. It is provided with a ratcheting structure that is tilted to reduce ratcheting in the rotation direction. Hereinafter, the play-filling structure of the main pole P1 will be described in detail.

The main pole P1 is formed with a first protrusion 35A protruding toward the opposite guide wall 23 on the side portion of the main body surface portion 30A on the counterclockwise direction side shown in the drawing. Further, a second protrusion 35B projecting toward the facing guide wall 23 is also formed on the side portion of the main body surface portion 30A of the main pole P1 on the clockwise direction side shown in the drawing.

The first protrusion 35A is formed at a position closer to the inside than the center in the radial direction on the side portion of the main body surface portion 30A of the main pole P1 on the counterclockwise direction side shown in the drawing. The first protrusion 35A is formed so as to project in the counterclockwise direction shown in the cross-sectional convex curved surface shape over the entire area of the main pole P1 in the plate thickness direction. The second protrusion 35B is formed at the outer end position in the radial direction on the side portion of the main body surface portion 30A of the main pole P1 on the clockwise side in the illustrated direction. The second protrusion 35B is formed so as to project in the clockwise direction shown in the cross-sectional trapezoidal shape over the entire area of the main pole P1 in the plate thickness direction.

As shown in FIG. 35, the main pole P1 is provided with a gap S in the rotational direction between the main pole P1 and the guide walls 23 on both sides thereof in order to ensure the slidability inward and outward in the radial direction. It is composed. However, due to the setting of the gap S, when the main pole P1 is pushed outward in the radial direction by the rotary cam 40 as described above in FIG. 10, the main pole P1 has a backlash that is tilted in the rotational direction between the guide walls 23. Can occur.

Specifically, as shown in FIG. 35, the main pole P1 is moved from the inside to the outside in the radial direction at the pressing point R eccentric from the central position in the rotation direction to the counterclockwise direction shown by the rotation cam 40 described above. It is configured to be pressed. Therefore, the main pole P1 is pushed out by the above-mentioned pressing force to a position where it meshes with the internal teeth 12A of the ratchet 10 while rotating in the clockwise direction shown in the drawing between both guide walls 23 with the pressing point R as a fulcrum. It is composed. Alternatively, the main pole P1 has its central tooth surface meshed with the internal tooth 12A of the ratchet 10, and then, with the meshing point K of the central tooth surface that meshes deepest with the internal tooth 12A as a fulcrum, in the clockwise direction shown in the drawing. It is configured to be able to rotate.

When the rotation of the main pole P1 as described above occurs, the main pole P1 is tilted so as to be pulled between the guide walls 23, and the main pole P1 can be in a state of looseness in the rotation direction. However, when the inclination is large, the tooth surface on one end side is the meshing depth with the internal tooth 12A, centering on the central tooth surface of the external tooth 31 in which the main pole P1 meshes most deeply with the internal tooth 12A of the ratchet 10. May be moved to make it shallower. Therefore, in order to prevent such a problem from occurring, when the main pole P1 is tilted between the guide walls 23, the first protrusion 35A and the second protrusion 35B hit the guide walls 23 on each side, respectively. It is configured so that it can be touched and the backlash in the rotation direction can be reduced without being greatly tilted.

Specifically, as shown in FIG. 35, when the main pole P1 is pressed from the inside to the outside in the radial direction by the rotary cam 40, the main pole P1 rotates in the clockwise direction shown in the drawing. However, due to this rotation, the first protrusion 35A hits the opposite guide wall 23, so that the rotation of the main pole P1 in the same direction is stopped at an early stage. Then, from that state, when the main pole P1 meshes with the internal teeth 12A of the ratchet 10, the main pole P1 engages with the central tooth surface of the external teeth 31 and the internal teeth 12A by the force applied from the pressing point R. A rotational force in the clockwise direction shown around the point K is applied.

As a result, the main pole P1 exerts a pressing force due to the rotational force on the guide wall 23 on the side where the first protrusion 35A is in contact. Then, as a reaction to this, the main pole P1 has the internal tooth 12A with which the central tooth surface (engagement point K) is in contact with the contact point between the first protrusion 35A and the guide wall 23 as a fulcrum in the clockwise direction shown in the drawing. Apply a rotational force that pushes it around. As a result, the main pole P1 rotates the ratchet 10 slightly in the clockwise direction as shown in FIG. 36 with the contact point between the first protrusion 35A and the guide wall 23 as a fulcrum. Push it around in the direction to bring the second protrusion 35B into contact with the opposing guide wall 23.

The rotation of the main pole P1 is stopped at an early stage by the contact of the second protrusion 35B with the guide wall 23. Then, due to the above contact, the main pole P1 is engaged with the internal teeth 12A of the ratchet 10 in a state in which the main poles P1 are loosely packed in the rotational direction between the guide walls 23.

As described above, due to the structure in which the first protrusion 35A and the second protrusion 35B of the main pole P1 come into contact with the guide walls 23 on each side, the main pole P1 is tilted between the guide walls 23 in the rotational direction. Appropriately suppressed. As a result, the tooth surfaces on both ends of the outer teeth 31 of the main pole P1 can be held in a well-balanced state in which one of the tooth surfaces of the ratchet 10 is meshed with the internal teeth 12A without making it shallow.

Which phenomenon occurs first in the contact with the guide wall 23 on each side of the main pole P1 and the engagement of the central tooth surface (engagement point K) of the outer teeth 31 with the inner teeth 12A of the ratchet 10. You may have it. That is, no matter which phenomenon occurs first, the reaction caused by it causes the other contact and meshing described above. As described above, the main pole P1 meshes with the ratchet 10 in a state where the main pole P1 is loosely packed in the rotation direction with respect to the guide 20, so that the other sub pole P2 described above in FIG. 10 is loosely packed with the guide 20 in the rotation direction. However, the backlash in the rotation direction between the ratchet 10 and the guide 20 can be appropriately reduced.

<< About the tooth surface shape of the external tooth 31 of the main pole P1 >>
As shown in FIG. 37, the main pole P1 having the backlash packing structure in the rotation direction has a configuration in which a protruding portion 31A that partially protrudes is formed on each tooth surface of the central tooth of the external tooth 31. Tooth. As described above in FIGS. 34 to 36, each of the protruding portions 31A is engaged with the internal teeth 12A of the ratchet 10 in a posture in which the main pole P1 is tilted in the rotational direction between the guide walls 23 and is loosely packed. , The tips thereof are in line contact with each tooth surface of the corresponding internal teeth 12A (see FIG. 37).

Due to the contact of each of the protruding portions 31A, the ratchet 10 is in a state of being loosely packed in both directions of rotation with respect to the main pole P1. Specifically, each protruding portion 31A has a shape that protrudes from each tooth surface of the central tooth of the external tooth 31 in a shape that partially bulges in a shape different from the general surface B of each tooth surface. Will be done. Specifically, each protruding portion 31A has a shape that protrudes in a mountain shape with a constant cross section over the entire area of the main pole P1 in the plate thickness direction, and corresponds to each tooth surface of the internal teeth 12A and a pitch circle P ( It is configured to make line contact at a position on the circle that connects the contact points of meshing.

That is, each tooth surface of the central tooth of the external tooth 31 is, in other words, recessed from the general surface B with respect to the protruding portion 31A so that the contact (meshing) with the internal tooth 12A is performed only at the protruding portion 31A. It can be said that it has a unique shape. The general surface B of each tooth surface is a region A (in the tooth length direction between the tooth tip circle C1 and the tooth tip circle C2 of the internal tooth 12A of the ratchet 10) that contributes to the meshing strength of the central tooth of the external tooth 31. It is a part that forms the tooth surface of the region), and has a surface shape that extends in an oblique straight line (or involute curve shape). Each protruding portion 31A has a shape that protrudes from an intermediate portion in the tooth length direction on the general surface B of each tooth surface.

As described above, each protrusion 31A is configured to make line contact with each corresponding tooth surface of the internal tooth 12A at a position on the pitch circle P, so that the arc on the pitch circle P of the central tooth of the external tooth 31 is formed. A large tooth thickness can be secured. Further, when the main pole P1 engages with the ratchet 10 and then tilts in the rotational direction together with the ratchet 10 as shown in FIGS. 35 to 36, the main pole P1 is used for each tooth of the central tooth of the external tooth 31. The surface can be smoothly rotated to a position where the protruding portions 31A are brought into contact with each other without being hooked on each tooth surface of the internal teeth 12A in the middle.

<< Summary >>
Summarizing the above, the seat reclining device 4 according to the present embodiment has the following configuration. In the following, the reference numerals given in parentheses are the reference numerals corresponding to the respective configurations shown in the above embodiments.

That is, the vehicle seat reclining device (4) includes a ratchet (10) and a guide (20) assembled in the axial direction so as to be able to rotate relative to each other, and a pair of guide walls (23) provided on the guide (20). The outer teeth (31) are engaged with the inner teeth (12A) of the ratchet (10) by the movement of being supported from both sides in the rotational direction and pushed outward in the radial direction, and between the ratchet (10) and the guide (20). It has a pole (30) that locks the relative rotation of the ratchet and a cam (40) that pushes the pole (30) from the inside to the outside in the radial direction. Each of the poles (30) partially protrudes from both tooth surfaces of one tooth of the external tooth (31) in a shape different from the general surface (B) of each tooth surface, and the corresponding internal teeth (12A). It has a protrusion (31A) that makes line contact with the tooth surface.

According to the above configuration, the external teeth (31) of the pole (30) are in contact with the internal teeth (12A) of the ratchet (10) with both protruding portions (31A) in contact with each other. Therefore, even if the pole (30) tilts in the rotational direction with respect to the guide (20), the outer teeth (31) abut against both the internal teeth (12A) of the ratchet (10) in the rotational direction. It can be engaged with the ratchet in both directions of rotation.

Further, a plurality of poles (30) are provided side by side in the rotation direction, and one of them is pushed and moved by the cam (40) so as to be inclined in the rotation direction between the pair of guide walls (23). It is a main pole (P1) having a backlash packing structure in the rotation direction that hits both of 23) and is loosely packed. A protrusion (31A) is provided on the main pole (P1). According to the above configuration, by providing the protrusion (31A) on the main pole (P1) having a backlash packing structure in the rotation direction with respect to the guide (20), the internal teeth of the ratchet (10) of each protrusion (31A) are provided. The contact point with respect to (12A) is less likely to fluctuate. Therefore, the outer teeth (31) of the pole (30) can be more appropriately meshed with the internal teeth (12A) of the ratchet (10) in a state of being loosely packed in the rotational direction.

Further, the outer teeth (31) of the pole (30) have a tooth surface shape in which the depth of penetration into the inner teeth (12A) gradually becomes shallower from the center in the rotation direction toward both outer sides. A protrusion (31A) is formed on each tooth surface of the central tooth in the rotational direction of the external tooth (31). According to the above configuration, among the external teeth (31) of the pole (30), the pole (30) is provided by providing the protruding portion (31A) in the central tooth that penetrates deepest into the internal tooth (12A) of the ratchet (10). The outer teeth (31) of the ratchet (10) can be more appropriately meshed with the internal teeth (12A) of the ratchet (10) in a state of being loosely packed in the rotation direction.

Further, the protruding portion (31A) makes line contact with each corresponding tooth surface of the internal tooth (12A) at a position on the pitch circle (P). According to the above configuration, it is possible to secure a large arc tooth thickness on the pitch circle (P) of the teeth of the external teeth (31) provided with the protrusions (31A).

(Second Embodiment)
Subsequently, the tooth surface shape of the central tooth in the rotation direction of the external tooth 31 of the main pole P1 according to the second embodiment of the present invention will be described with reference to FIG. 38. In the present embodiment, the protruding portion 31B formed on each tooth surface of the central tooth of the external tooth 31 bulges in a mountain shape from the middle portion in the tooth length direction on the general surface B of each tooth surface to the tooth tip. It has a protruding shape. Each protruding portion 31B is configured to make line contact with each corresponding tooth surface of the internal teeth 12A at a position on a pitch circle P (a circle connecting the contact points of meshing). Since the configurations other than the above are the same as the configurations shown in the first embodiment, the same reference numerals are given and the description thereof will be omitted.

(Third Embodiment)
Subsequently, the tooth surface shape of the central tooth in the rotation direction of the external tooth 31 of the main pole P1 according to the third embodiment of the present invention will be described with reference to FIG. 39. In the present embodiment, one of the protrusions 31C formed on each tooth surface of the central tooth of the external tooth 31 (on the left side in the drawing) is on the pitch circle P with respect to each corresponding tooth surface of the internal tooth 12A. The other side (on the right side in the drawing) is formed so as to make line contact at a position shifted toward the tooth tip side from the pitch circle P. Since the configurations other than the above are the same as the configurations shown in the first embodiment, the same reference numerals are given and the description thereof will be omitted.

<< About other embodiments >>
Although the embodiments of the present invention have been described above using the three embodiments, the present invention can be implemented in various forms in addition to the above embodiments.

1. 1. The vehicle seat reclining device of the present invention can be applied to seats other than the right seat of an automobile, as well as seats used for vehicles other than automobiles such as railroads, and various vehicles such as aircraft and ships. Is also widely applicable. 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 backs the seat back to a base such as a bracket fixed to the vehicle body side. It may be connected so that the angle can be adjusted.

2. The vehicle seat reclining device may be configured such that the ratchet is connected to a base fixed to the vehicle body side such as a seat cushion, and the guide is connected to the seat back.

3. 3. The poles that lock the relative rotation between the ratchet and the guide may be provided side by side in two or four or more in the rotation direction. That is, one main pole and one other pole may be provided, or one main pole may be provided with three or more other poles. Further, the arrangement of the poles in the rotation direction is not limited to the ones arranged evenly, and may be arranged one-sidedly.

4. The cam that pushes each pole from the inside to the outside in the radial direction is not limited to the rotation type configuration, and each pole is moved in the radial direction by sliding in the radial direction as shown in documents such as Japanese Patent Application Laid-Open No. 2014-217662. It may be a slide type configuration that pushes it outward. Further, the operation of pulling each pole back inward in the radial direction is performed by using a member separate from the cam such as a release plate as shown in documents such as Japanese Patent Application Laid-Open No. 2015-227701. Is also good.

5. The backlash-filling structure of the main pole may be configured such that the main pole is pressed obliquely in the rotation direction by the cam and tilted in a tension shape between the guide walls. Further, as shown in documents such as Japanese Patent Application Laid-Open No. 2016-215999, the backlash-filled structure of the main pole is slid so that the main pole is divided into two in the rotation direction and the entire width is widened between the guide walls. It may be a type of configuration that moves and closes backlash.

6. The protruding portion may be provided on a pole other than the main pole having a backlash packing structure.

1 Seat 2 Seat back 2F Side frame 2F Fitting hole 2Fb Through hole 2Fc Locking plate 3 Seat cushion 3F Reclining plate 3F Fitting hole 3Fb Through hole 3Fc Front stopper 3Fd Rear stopper 4 Seat reclining device (Vehicle seat reclining device)
5 Reclining lever 5A Operation pin 5B Connecting rod 6 Return spring 10 Ratchet 11 Disk body 11A Through hole 11B Expansion surface 12 Cylindrical part 12A Internal tooth 13 Intermediate cylindrical part 13A First area 13B Second area 13C Third area 13D 1st convex part 13E 2nd convex part 13E1 Relief concave part Y Gap 13G Slope 13H Protruding slope 13H1 Guide slope A1 Lock area A2 Free area A3 Relief area A4 Coupling area 14 Dove B1 Contact area B2 Non-contact area 20 Guide 21 Disk body 21A Through hole 21Aa Hooking hole 21B Dowel 22 Cylindrical part 23 Guide wall 23A Control surface 23B Support surface M1 Guide wall M2 Guide wall T gap 24A Pole accommodation groove 24B Cam accommodation groove 30 Pole 30A Main body surface part 30B Offset surface 31 External teeth 31A Protruding part 31B Protruding part 31C Protruding part 32 Pressed surface part 33 Pull-in hole 34 Riding protrusion 34A Outer peripheral surface part 35A First protrusion 35B Second protrusion P1 Main pole P2 Sub pole Q Quality control surface 40 Rotating cam (cam)
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 61A Caulking part 62 Flange part 62A Diagonal contact part 63 Step part C Rotation center Pa front Tilt position Pb First stage lock position Pc Rear fall position Pd Torso angle K Engagement point R Pressing point S Gap B General surface P Pitch circle C1 Tooth tip circle C2 Tooth tip circle A Area that contributes to meshing strength

Claims (4)

It is a seat reclining device for vehicles,
Ratchets and guides that are assembled in the axial direction so that they can rotate relative to each other,
It is supported from both sides in the rotational direction by a pair of guide walls provided on the guide, and the external teeth are meshed with the internal teeth of the ratchet by the movement pushed outward in the radial direction, so that the relative between the ratchet and the guide is provided. A pole that locks the rotation and
It has a cam that pushes the pole from the inside to the outside in the radial direction.
A protruding portion in which the pole partially protrudes from both tooth surfaces of one tooth of the external tooth in a shape different from the general surface of each tooth surface and linearly contacts each corresponding tooth surface of the internal tooth. Seat reclining device for vehicles. The vehicle seat reclining device according to claim 1.
A plurality of the poles are provided side by side in the rotation direction, and one of them is pushed and moved by the cam so as to tilt in the rotation direction between the pair of the guide walls and hit both of the pair of guide walls to be loosely packed. It is said to be the main pole with a backlash packing structure in the direction,
A vehicle seat reclining device in which the protrusion is provided on the main pole. The vehicle seat reclining device according to claim 1 or 2.
The outer teeth of the pole have a tooth surface shape in which the depth of penetration into the inner teeth gradually becomes shallower from the center in the rotation direction toward both outer sides.
A vehicle seat reclining device in which the protruding portion is formed on each tooth surface of the central tooth in the rotation direction of the external tooth. The vehicle seat reclining device according to any one of claims 1 to 3.
A vehicle seat reclining device in which the protruding portion makes line contact with each corresponding tooth surface of the internal tooth at a position on a pitch circle.

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