JP5497490B2 - Reclining device - Google Patents

Description

  The present invention relates to a reclining device that permits / inhibits tilting of a seat back with respect to a seat cushion.

  A base arm on the seat cushion side and a base arm provided rotatably on the base arm, provided on one of the upper arms provided on the seat back side, on the surface parallel to the plane of rotation of the upper arm, the upper arm An inner tooth formed on a circumference around the rotation center axis of the base, the base arm, a pole provided between the upper arm and formed with an outer tooth capable of meshing with the inner tooth, the base arm, A pole guide provided on either one of the upper arms, for guiding the pole in a radial direction around a rotation center axis of the upper arm, and engaging / separating the external teeth of the pole with the internal teeth And a cam that is rotatably provided about the rotation center axis and that pushes the surface opposite to the surface on which the external teeth of the pole are formed. Devices have been proposed.

  The reclining device is in a locked state in which the rotation of the upper arm with respect to the base arm is prohibited when the external teeth of the pole mesh with the internal teeth. Further, when the outer teeth of the pole are separated from the inner teeth, the unlocked state in which the rotation of the upper arm with respect to the base arm is permitted (see, for example, Patent Document 1).

JP 2002-65387 A

However, there is a gap between the pole and the guide that guides the pole in the radial direction of the circle around the rotation center axis of the upper arm due to the dimensional error of the parts.
Therefore, even in the locked state, if the load in the direction of tilting the seat back backward or forward acts on the upper arm due to the pressure of the seated person's back, the pole is tilted, and the upper arm has a problem of shaking in the rotation direction. .

  The present invention has been made in view of the above problems, and an object thereof is to provide a reclining device in which an upper arm does not rattle.

  The invention according to claim 1 is provided on either the seat cushion side of the seat or the seat back side provided rotatably with respect to the seat cushion, and on a circumference around the rotation center axis of the seat back. A ratchet having inner teeth formed therein and outer teeth that can mesh with the inner teeth are formed, and in a state of meshing with the inner teeth, a side portion that extends from one end side of the outer teeth toward the rotation center axis side A lock inner wall surface having an inclination that approaches the external tooth direction as it goes to the opening, and a pole having an unlock inner wall surface that faces the lock inner wall surface through a space. , Provided on the other side of the seat cushion side or the seat back side, rotatable with respect to the ratchet, and meshing the outer teeth of the pole with the inner teeth on the surface facing the ratchet. A base arm provided with a pole guide that guides the pole in the direction of separation, a first cam that is rotatably provided around the rotation center axis, and is disposed closer to the rotation center axis than the pole; A second cam that is disposed in the pole housing and is pushed in a direction to abut against the inner wall surface of the lock and the pole guide when the first cam abuts, and in a direction in which the external teeth of the pole mesh with the inner teeth. An urging means for urging the first cam; and for moving the second cam from the lock inner wall surface to the unlocking inner wall surface, guiding the pushing direction of the unlocking inner wall surface, and releasing the lock. A reclining device comprising release means.

  Usually, by the urging force of the urging means, the first cam pushes the second cam, and the second cam pushes the lock inner wall surface of the pole and the pole guide. When the second cam pushes on the lock inner wall surface of the pole, the outer teeth of the pole mesh with the inner teeth, and the upper arm is brought into a locked state in which rotation with respect to the base arm is prohibited.

  When the first cam rotates in the direction away from the second cam against the urging force of the urging means, the second cam guide also rotates with the first cam, and the second cam moves from the lock inner wall surface to the lock release inner wall surface. Move and push the unlocked inner wall. When the second cam pushes the unlocked inner wall surface of the pole, the pole moves to the rotation center axis side, the outer teeth of the pole move away from the inner teeth, and the unlocked state is permitted in which the upper arm is allowed to rotate with respect to the base arm. .

  According to a second aspect of the present invention, the first cam includes: a base portion on the rotation center axis side; and a cam portion on the pole side that is connected to the base portion and has a thickness in the direction of the rotation center axis that is thinner than the base portion. The step of forming a step in the center of one of the two surfaces along the rotation plane of the ratchet in the radial direction of the circle centered on the rotation center axis. A base portion on the outer tooth side, and a storage portion formed continuously with the base portion, and a cam action portion having a thinner thickness in the direction of the rotation center axis than the base portion, and along the rotation plane of the ratchet One of the two surfaces has a shape in which a step is formed in the central portion in the radial direction of the circle centered on the rotation center axis, and the first cam and the pole are The cam portion of the first cam and the cam action portion of the pole are stacked. Is, the end face of the cam portion of the wall between the first cam of the step of the pole is a reclining device according to claim 1, characterized in that it is arranged to face.

  The invention according to claim 3 is characterized in that the pole guide has a thickness in the direction of the rotation center axis that is larger on the contact portion side of the second cam than on the rotation center axis side. Item 3. A reclining device according to item 1 or 2.

  According to the first to third aspects of the present invention, the first cam pushes the second cam, the second cam pushes the lock inner wall surface of the pole, and the upper arm is prohibited from rotating with respect to the base arm by the urging force of the urging means. When the seated person is in the locked state (locked state), a load that causes the seat back to tilt backward or forward acts on the upper arm due to pressure on the back of the seated person, etc., and the pole meshes with the inner teeth Also try to lean. However, since the second cam pushes the lock inner wall surface of the pole having an inclination approaching the external tooth direction as it goes to the opening, a rotational moment in the direction opposite to the inclination direction is generated on the pole, thereby preventing the inclination of the pole. Is done. Therefore, the upper arm does not rattle.

  Next, the pole guide is provided so as to sandwich the two side portions of the pole, and has a shape for guiding the external teeth of the pole in a direction to engage / separate with the internal teeth. The space between the lock inner wall surface is a space in which the distance between the two becomes narrower toward the outer teeth of the pole. When the second cam enters the space and the second cam pushes the lock inner wall surface of the pole, the outer teeth and the inner teeth mesh with each other, and rotation of the upper arm with respect to the base arm is prohibited. At this time, the second cam is pushed into the lock inner wall surface and the pole guide.

  In this locked state, when the outer teeth are separated from the inner teeth and the upper arm is allowed to rotate with respect to the base arm (unlocked state), if the pole is driven directly, the resistance against the guide when dragging the second cam Is big. However, in the present application, smooth unlocking can be achieved by moving the second cam from the lock inner wall surface to the unlocking inner wall surface and guiding the unlocking inner wall surface in a pushing direction by a releasing operation.

  According to a second aspect of the present invention, the first cam includes a base portion on the rotation center axis side and a cam portion on the pole side that is connected to the base portion and has a thickness in the direction of the rotation center axis that is thinner than the base portion. A step formed in a central portion in a radial direction of a circle centered on the rotation center axis on one surface of two surfaces along a rotation plane of the ratchet, The pole is connected to the base portion on the outer tooth side, is connected to the base portion, forms the storage portion, and includes a cam action portion whose thickness in the rotation center axis direction is thinner than the base portion, and follows the rotation plane of the ratchet One of the two surfaces has a shape in which a step is formed in the central portion in the radial direction of the circle centered on the rotation center axis, and the first cam and the pole are A cam portion of the first cam and a cam operating portion of the pole; It is laminated, and the end face of the cam portion of the the wall of the step of the pole first cam by being arranged so as to face, can be miniaturized reclining apparatus in the radial direction.

  The lock inner wall surface, which is the surface on which the second cam pushes the pole in the direction in which the outer teeth mesh with the inner teeth, is provided in the accommodating portion provided in the cam action portion. Therefore, the radial direction length of the 1st cam which pushes a 2nd cam can be set long by providing the position of an accommodating part as much as possible on the base side. By increasing the length of the first cam in the radial direction, it is possible to reduce the occurrence of backlash due to a dimensional error of the first cam, to obtain a desired operation with a small rotation angle, and to improve the operability.

  According to the invention of claim 3, the pole guide has a thickness in the direction of the rotation center axis that is larger on the contact portion side of the second cam than on the rotation center axis side. In the state in which the outer teeth and the inner teeth are engaged with each other, it is possible to prevent the inclination of the pole around the radial direction of the circle around the rotation center axis of the upper arm.

It is a disassembled perspective view of the locking device of this form. It is the disassembled perspective view which looked at the locking device of Drawing 1 from another direction. It is a disassembled perspective view of a pole and a 1st cam. It is the disassembled perspective view which looked at FIG. 3 from another direction. It is the top view which looked at the pole of FIG. 4 from upper direction. It is the front view which looked at the reclining apparatus of the assembled state from the ratchet side. It is sectional drawing in the cutting line AA of FIG. FIG. 7 is a cross-sectional view taken along a cutting line BB in FIG. 6. It is a block diagram of the state which removed the ratchet, and is a figure which shows a locked state. It is a block diagram of the state which removed the ratchet, and is a figure which shows a lock release start state. It is a block diagram in the state which removed the ratchet, and is a figure which shows a lock release state. It is a figure explaining other embodiment. It is a figure explaining other embodiment. It is a figure explaining other embodiment.

Next, embodiments of the present invention will be described with reference to the drawings.
Initially, the whole structure of the locking device of this form is demonstrated using FIG. 1, FIG. FIG. 1 is an exploded perspective view of the locking device of this embodiment, and FIG. 2 is an exploded perspective view of the locking device of FIG. 1 viewed from another direction.

In the reclining device of this embodiment, the lower arm (base arm) 101 is provided on the seat cushion side of the seat, and the ratchet 201 is provided on the seat back side of the seat.
A hole 103 and a hole 203 are formed in a portion through which the rotation center axis O of the lower arm 101 and the ratchet 201 passes. A shaft (not shown) that is rotationally driven by an operating force is inserted through these holes 103 and 203.

  As shown in FIG. 2, a substantially circular concave portion 205 centering on the rotation center axis O of the ratchet 201 is formed on the surface of the ratchet 201 facing the lower arm 101. 207 is engraved.

The ratchet 201 is formed by pressing a single plate.
Between the lower arm 101 and the ratchet 201, a pair of poles 301 and 301 ′ in which outer teeth 303 that can mesh with the inner teeth 207 are formed.

  As shown in FIG. 1, a recess 105 is formed on the surface of the lower arm 101 facing the recess 205 of the ratchet 201. The bottom surface of the recess 105 is parallel to the rotation plane of the ratchet 201. The bottom surface of the recess 205 is provided so as to sandwich the two side portions of the poles 301 and 301 ′, and guides the poles 301 and 301 ′ in the radial direction of a circle around the rotation center axis O of the ratchet 201. A pair of pole guides 111, 113, 111 ′, 113 ′ for engaging / separating the outer teeth 303 of the pole 301 with the inner teeth 207 are formed.

  A first cam 401 is disposed between the lower arm 101 and the ratchet 201. The first cam 401 can rotate around the rotation center axis O of the ratchet 201 and is disposed closer to the rotation center axis O than the poles 301 and 301 ′. An oval hole 403 is formed at the center of the first cam 401.

  Here, the pole 301 and the first cam 401 will be described with reference to FIGS. Since the pole 301 and the pole 301 'have the same structure, the description of the pole 301' is omitted. 3 is an exploded perspective view of the pole and the first cam, FIG. 4 is an exploded perspective view of FIG. 3 viewed from another direction, and FIG. 5 is a plan view of the pole of FIG. 4 viewed from above.

  3 to 5, particularly, as shown in FIG. 5, the pole 301 has one side portion of two side portions S <b> 1 and S <b> 2 along a radial direction of a circle around the rotation center axis O. A storage portion 307 having an opening 305 is formed in S2. The storage portion 307 includes a lock inner wall surface 309 that intersects with the radial direction of the circle around the rotation center axis O and has an inclination toward the outer tooth direction toward the rear portion of the seat, and the lock inner wall surface 309 and the space. And a lock releasing inner wall surface 311 formed on the side of the rotation center axis O from the lock inner wall surface 309.

  As shown in FIGS. 3 and 4, the pole 301 is connected to the base 321 on the external tooth 303 side and the base 321 to form a storage portion 307, and the thickness in the direction of the rotation center axis O is the base 321. One surface M1 of the two surfaces M1 and M2 along the rotation plane of the ratchet 201 is formed at a central portion in the radial direction of the circle centered on the rotation center axis O. It is the shape where the level | step difference was formed in.

  In this embodiment, a guide protrusion 331 is formed on the surface of the pole 301 that faces the lower arm 101 (see FIGS. 2 and 3). On the other hand, the lower arm 101 is formed with a guide groove 131 that extends in the radial direction of a circle centering on the rotation center axis O of the ratchet 201 and that the guide protrusion 331 is movably engaged with. The pawl 301 is also guided in the radial direction of the circle about the rotation center axis O of the ratchet 201 by the engagement of the guide protrusion 331 of the pawl 301 with the guide groove 131.

  As shown in FIGS. 3 and 4, the first cam 401 is connected to the base 405 on the rotation center axis O side and the base 405, and the poles 301 and 301 are thinner in the direction of the rotation center axis O than the base 405. It consists of 'side cam portions 407, 407'. Then, a step is formed in the central portion of one surface M3 of the two surfaces M3 and M4 along the rotation plane of the ratchet 201 in the radial direction of the circle centering on the rotation center axis O. ing.

  The first cam 401 and the pole 301 are formed by laminating the cam portion 407 of the first cam 401 and the cam action portion 323 of the pole 301, and the wall surface DM1 of the step of the first cam 401 and the rotation axis side of the pole 301 The end surface TM1 of the first cam 401 and the end surface TM2 of the cam portion 407 of the first cam 401 are opposed to each other.

  Returning to FIG. 1 and FIG. 2, the second cam 501 (501 ′) is disposed in the storage portion 307 (307 ′) of the pole 301 (301 ′). Since the second cam 501 and the second cam 501 'have the same structure, the description of the second cam 501' is omitted.

  The second cam 501 has a columnar shape (a columnar shape with a circular cross section), and its circumferential surface has a lock inner wall surface 309 of the storage portion 307, a lock inner wall surface 311 of the storage portion 307, and an opening of the storage portion 307. Through 305, the pole guide 111 can come into contact with a surface facing the side of the pole 301.

  The cam portion 409 of the first cam 401 is formed with an end surface TM3 (see FIGS. 3 and 4) that can contact the circumferential surface of the second cam 501, and the second cam 501 has a second end surface on the circumferential surface. When the end face TM3 of the cam portion 409 of the one cam 401 comes into contact, the second cam 501 is pushed in a direction to come into contact with the lock inner wall surface 309 and the surface of the pole guide 111 facing the side of the pole 301. ing.

  Further, the first cam 401 has a stopper projection 431 extending into the space between the pole guide 111 and the pole guide 113 ′, and a stopper projection extending into the space between the pole guide 113 and the pole guide 111 ′. 431 ′ are formed. The range in which the stopper projection 431 contacts the standing wall surface of the pole guide 111 and the standing wall surface of the pole guide 113 ′, and the range in which the stopper projection 431 ′ contacts the standing wall surface of the pole guide 113 and the standing wall surface of the pole guide 111 ′. Thus, the first cam 401 is rotatable.

  A disc-shaped release plate 601 is disposed between the first cam 401 and the ratchet 201. An oval hole 603 having the same shape as the hole 403 of the first cam 401 is formed at the center of the release plate 601. On the other hand, on the surface of the first cam 401 facing the release plate 601, two protrusions 411 that protrude in the direction of the release plate 601 across the rotation center axis O are formed. The protrusion 411 is engaged with a hole 604 formed in the peripheral portion of the oval hole 603 of the release plate 601.

Further, a hole 602 through which a wire spring, which will be described later, is inserted is formed in the periphery of the oval hole 603 of the release plate 601.
The cross-sectional shape of the shaft (not shown) that is rotationally driven by the operating force described above is an oval shape, and the release plate 601 and the first cam 401 are inserted through the hole 603 of the release plate 601 and the hole 403 of the first cam 401. And rotate together.

  The release plate 601 is formed with a second cam guide 611 (611 ') with which the second cam 501 (501') is engaged. The second cam guide 611 moves the second cam 501 from the lock inner wall surface 309 to the unlock inner wall surface 311 when the first cam 401 in contact with the second cam 501 rotates in the direction away from the second cam guide 611, The shape is set so as to guide the wall surface 311 in the pushing direction.

  Between the release plate 601 and the ratchet 101, a wire spring 701 (701 ') as an urging means is disposed. One end of the wire spring 701 is inserted into the hole 605 of the release plate 601 and is locked in a hole 101 a formed in the lower arm 101. The other end of the wire spring 701 is inserted into the hole 602 of the release plate 601 and is locked in the hole 404 formed in the first cam 401. The pole 301 is biased in the direction in which the external teeth 303 are engaged with the internal teeth 207 of the ratchet 201 by the biasing force of the wire spring 701 via the first cam 401.

  Further, in this embodiment, as shown in FIG. 1, the inner teeth 207 side of the pole guides 111 (111 ′) and 113 (113 ′) are thicker in the direction of the rotation center axis O than the rotation center axis O side. The thickened portions 111a (111a ′) and 113a (113a ′) are formed.

  6 to 8, the lower arm 101 and the ratchet 201 are assembled so as to sandwich the pole 301, the first cam 401, the second cam 501, the release plate 601, and the spring 701. The lower arm 101 and the ratchet An outer peripheral portion of 201 is fixed by an outer peripheral ring 801. 6 is a front view of the assembled reclining device as seen from the ratchet side, FIG. 7 is a cross-sectional view taken along the line AA in FIG. 6, and FIG. 8 is a cross-sectional view taken along the line BB in FIG. FIG.

Next, the operation of the above configuration will be described with reference to FIGS. 9 to 11 are configuration diagrams in a state where the ratchet 201 is removed. FIG. 9 shows a locked state, FIG. 10 shows a lock release start state, and FIG. 11 shows a lock released state.
(Locked state)
As shown in FIG. 9, the first cam 401 pushes the second cam 501 (point K1 in the figure) by the urging force of the spring 701 (701 ′), and the second cam 501 includes the lock inner wall surface 309 of the pole 301 and the pole. The guide 111 is pushed (points K2, K3 in the figure).

When the second cam 501 pushes the lock inner wall surface of the pole 301 309, the outer teeth 303 of the pole 301 mesh with the inner teeth 207 of the ratchet 201, and rotation of the upper arm (ratchet 201) with respect to the base arm (lower arm 101) is prohibited. Has been.
(Release start)
As shown in FIG. 10, when the first cam 401 is rotated in the direction away from the second cam 501 against the urging force of the spring 701 (701 ′), the second cam guide 611 of the release plate 601 is also moved to the first cam. The second cam guide 611 contacts with the second cam 501 (point K4 in the figure). At this time, the second cam 501 contacts the lock inner wall surface 309 of the pole 301 (point K5 in the figure) and contacts the pole guide 111 (point K6 in the figure).
(Unlocked state)
Further, when the first cam 401 is rotated in a direction away from the second cam 501, the second cam 611 is separated from the lock inner wall surface 309 by the second cam guide 611, and as shown in FIG. It moves from the lock inner wall surface 309 to the unlock inner wall surface 311 and pushes the unlock inner wall surface 311 (K7 in the figure).

  When the second cam 501 pushes the unlocked inner wall surface 311 of the pole 301, the pole 301 moves to the rotation center axis O side, the outer teeth 303 of the pole 301 move away from the inner teeth 207 of the ratchet 201, and the base arm of the upper arm It becomes the unlocked state in which the rotation with respect to is permitted.

According to such a configuration, the following effects can be obtained.
(1) Due to the urging force of the spring 701 (701 ′), the first cam 401 pushes the second cam 501 (501 ′), and the second cam 501 (501 ′) is the lock inner wall surface 309 of the pole 301 (301 ′). (309 '), if the seated person is in a state where the upper arm is not allowed to rotate relative to the base arm (locked state), the seat back is pushed back to the upper arm (ratchet 201) by the pressure of the seated person's back. A load in the tilting direction (arrow D direction in FIG. 9) acts, and the pole 301 (301 ′) meshing with the internal teeth 207 tends to tilt in the arrow E direction in FIG. However, the second cam 501 (501 ′) has a circular cross-sectional shape, intersects the radial direction of the circle centered on the rotation center axis O, and approaches the external teeth 303 (303 ′) toward the rear portion of the seat. Since the lock inner wall surface 309 (309 ′) of the tilted pole 301 (301 ′) is pushed vertically, a rotational moment in the direction opposite to the tilt direction is generated in the pole 301 (301 ′), and the pole 301 (301 ′) Is prevented from tilting. Therefore, the upper arm does not rattle.

 (2) The pole guide 111 (111 ′) is provided so as to sandwich the two sides of the pole 301 (301 ′) on a plane parallel to the plane of rotation of the upper arm. Since the shape is guided in the radial direction of a circle around the rotation center axis O, the space between the pole guide 111 (111 ′) and the lock inner wall surface 309 (309 ′) of the pole 301 (301 ′) is The space between the poles 301 (301 ′) becomes narrower toward the external teeth 303 (303 ′). The second cam 501 (501 ′) enters the space, and the second cam 501 (501 ′) pushes the lock inner wall surface 309 (309 ′) of the pole 301 (301 ′), whereby the external teeth 303 (303 ′). And the inner teeth 207 mesh with each other, and rotation of the upper arm with respect to the base arm is prohibited. At this time, the second cam 501 (501 ') is pushed into the lock inner wall surface 309 (309') and the pole guide 111 (111 ').

  When the outer teeth 303 (303 ′) are separated from the inner teeth 207 from this locked state and the upper arm is allowed to rotate with respect to the base arm (unlocked state), when the pole 301 (301 ′) is directly driven, Since the second cam 501 (501 ′) is pushed into the lock inner wall surface 309 (309 ′) and the pole guide 111 (111 ′), the lock cannot be released smoothly. However, in this embodiment, the second cam 501 (501 ′) is driven by the second cam guide 611 (611 ′), and the second cam 501 (501 ′) is unlocked from the lock inner wall surface 309 (309 ′). Since it is moved to the inner wall surface 311 (311 ′) and the unlocked inner wall surface 311 (311 ′) is pushed, smooth unlocking can be obtained.

 (3) The pole 301 includes a base portion 321 on the external tooth 303 side, a cam portion 323 that is connected to the base portion 321, forms a storage portion 307, and is thinner in the direction of the rotation center axis O than the base portion 321. One surface M1 of the two surfaces M1 and M2 along the rotation plane of the ratchet 201 has a shape in which a step is formed in the central portion in the radial direction of the circle with the rotation center axis O as the center. ing.

  The first cam 401 includes a base 405 on the rotation center axis O side, and cam portions 407 and 407 ′ on the poles 301 and 301 ′ that are connected to the base 405 and have a thickness in the direction of the rotation center axis O smaller than that of the base 405. It is made up of. Then, a step is formed in the central portion of one surface M3 of the two surfaces M3 and M4 along the rotation plane of the ratchet 201 in the radial direction of the circle centering on the rotation center axis O. ing.

  The first cam 401 and the pole 301 are formed by laminating the cam portion 407 of the first cam 401 and the cam action portion 323 of the pole 301, and the wall surface DM1 of the step of the first cam 401 and the rotation axis side of the pole 301 The end surface TM1 of the first cam 401 and the end surface TM2 of the cam portion 407 of the first cam 401 are opposed to each other.

Therefore, the reclining device can be downsized in the radial direction.
In addition, the lock inner wall surface 309 (309 ′), which is the surface on which the second cam 501 (501 ′) pushes the pole 301 (301 ′) in the direction in which the outer teeth 303 (303 ′) mesh with the inner teeth 207, has cam action. It is provided in a storage portion 307 (307 ′) provided in the portion. Therefore, the radial direction length of the first cam 401 that pushes the second cam 501 (501 ′) can be set long by providing the storage portion 307 (307 ′) as close to the base 321 (321 ′) as possible. By increasing the length of the first cam 401 in the radial direction, it is possible to reduce the occurrence of backlash due to the dimensional error of the first cam 401, to obtain a desired operation with a small rotation angle, and to improve the operability. .

 (4) On the inner teeth 207 side of the pole guides 111 (111 ′) and 113 (113 ′), the thickened portions 111a (111a ′) and 113a are thicker in the rotation center axis O direction than the rotation center axis O side. (113a ′) is formed so that the outer teeth 303 (303 ′) of the pole 301 (301 ′) and the inner teeth 207 of the ratchet 201 are engaged with each other about the rotation center axis O of the upper arm. It is possible to prevent the pole 301 (301 ′) from tilting around the radial direction of the circle.

  In addition, this invention is not limited to the said form. In the above embodiment, a ratchet with internal teeth formed on the seat back side is provided, but a ratchet with internal teeth formed on the seat cushion side may be provided.

  Also, a release plate 601 that rotates integrally with the first cam 401 is provided, and a second cam guide 611 (611 ′) is provided on the release plate 601. However, the second cam guide is not provided with the release plate 601. One cam may be provided.

  Further, in this embodiment, the ratchet 201 is manufactured by pressing a single plate. However, as shown in FIG. 12, two members, a frame mounting portion 1203 formed by pressing and attached to the seat back frame of the seat, and a ring portion 1205 formed by pressing and having the internal teeth 1207 formed thereon. May be a ratchet 1201 laminated. In this case, the frame attaching portion 1203 and the ring portion 1205 include welding, rivet joining, mechanical clinch that is plastically deformed and joined so that the two members are engaged, but is not limited thereto. Further, the ring portion 1205 is made of a quenched steel plate or a steel plate having a strength equivalent to that of the quenched steel plate.

The ring portion 1205 may be formed as a single plate or may be formed by laminating a plurality of thin plates in the tooth width direction of the internal teeth 1207.
Further, as shown in FIG. 13, the ring portion 1205 may be a single member integrated in the circumferential direction (ring shape), or the ring portion 1205 may be divided into two in the circumferential direction as shown in FIG. It is good also as two members, 1 ring member 1205a and 2nd ring member 1205b. Furthermore, it is good also as three or more members.

According to such a configuration, the following effects can be obtained.
(1) It is possible to use different materials for the frame member 1203 and the ring 1205, and it is possible to reduce costs by selecting a material that meets the functional requirements.

(2) Since the frame mounting portion 1203 has a simple shape, the molding load can be suppressed.
(3) By dividing the ratchet 1201 into a plurality of parts, the molding die can be simplified, and the die cost can be suppressed.

 (4) When the ring portion 1205 is formed by laminating a plurality of thin plates, sagging of the upper portion of the internal teeth 1207 can be reduced, and the tooth width can be reduced. Therefore, it is possible to reduce material costs and product load.

 (5) When a ratchet was formed from a single plate, quenching was performed after the ratchet was formed. In the case of the present embodiment, by quenching the ring portion in advance, quenching after assembling the ratchet becomes unnecessary, and deterioration of dimensional accuracy due to quenching can be prevented. Moreover, by using a steel plate having the same strength as the quenched steel plate as the material of the ring portion, quenching becomes unnecessary, and the quenching cost can be reduced.

 (6) When the ring portion 1205 is composed of two members including a first ring member 1205a and a second ring member 1205b that are divided in the circumferential direction, it is possible to take a plate as shown in FIG. As shown in FIG. 5, the material yield is improved and the cost can be reduced as compared with the case where the circumferential direction is a single member.

101 base arm 201 ratchet 301 pole 307 groove 309 lock inner wall surface 311 unlock inner wall surface 401 first cam 501 second cam 601 release plate 611 second cam guide 701 spring 801 outer ring

Claims (3)

A ratchet provided on either the seat cushion side of the seat or the seat back side provided to be rotatable with respect to the seat cushion, and having inner teeth formed on a circumference around the rotation center axis of the seat back When,
The outer teeth that can mesh with the inner teeth are formed, and in a state of meshing with the inner teeth, the outer teeth have a storage portion that opens to the side extending from the one end side toward the rotation center axis side, A lock inner wall surface having an inclination approaching the external tooth direction as it goes to the opening in the storage portion, a pole having an unlock inner wall surface facing the lock inner wall surface through a space;
Provided on the other side of the seat cushion side or the seat back side, is rotatable with respect to the ratchet, and in a direction of engaging / separating the external teeth of the pole with the internal teeth on the surface facing the ratchet A base arm provided with a pole guide for guiding the pole;
A first cam provided rotatably about the rotation center axis and disposed closer to the rotation center axis than the pole;
A second cam disposed in the pole housing and pushed in a direction to contact the inner wall surface of the lock and the pole guide when the first cam contacts;
A biasing means for biasing the first cam in a direction in which the external teeth of the pole mesh with the internal teeth;
Release means for moving the second cam from the lock inner wall surface to the unlock inner wall surface, guiding the unlocking inner wall surface in a pushing direction, and performing a lock release operation;
A reclining device comprising: The first cam is
A base portion on the rotation center axis side and a cam portion on the pole side that is connected to the base portion and has a thickness in the direction of the rotation center axis that is thinner than the base portion. Two surfaces along the rotation plane of the ratchet One of the surfaces has a shape in which a step is formed in the central portion in the radial direction of the circle around the rotation center axis,
The pole
A base portion on the outer tooth side, connected to the base portion, the storage portion is formed, and includes a cam action portion whose thickness in the rotation center axis direction is thinner than the base portion, and is 2 along the rotation plane of the ratchet One of the two surfaces has a shape in which a step is formed in the central portion in the radial direction of the circle around the rotation center axis,
Further, the first cam and the pole are formed by laminating a cam portion of the first cam and a cam action portion of the pole, and a wall surface of the step of the pole and an end surface on the cam portion side of the first cam. The reclining device according to claim 1, wherein the reclining device is arranged to face each other. The pole guide is
The reclining device according to claim 1 or 2, wherein the thickness in the rotation center axis direction is thicker on the contact portion side of the second cam than on the rotation center axis side.

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