JP2012050695A - Reclining device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reclining device having a first member formed with internal teeth along the circumferential direction, a second member provided to be rotated in the circumferential direction relative to the first member, and pawls rotatably provided at the second member and having external teeth meshing with the internal teeth, in which locking failure is not generated.SOLUTION: The pawls 33 are each provided with a projecting portion 35 projecting toward a base plate (second member) 25, and the base plate 25 is provided with holes (recesses) 37 into which the projecting portions 35 are rotatably fitted.

Description

  The present invention includes a first member formed with internal teeth along the circumferential direction, a second member provided so as to be rotatable relative to the first member and the circumferential direction, and rotatable to the second member. A pole having external teeth that can mesh with the internal teeth, a lock position where the external teeth mesh with the internal teeth, and an unlock position where the meshing between the external teeth and the internal teeth is released The present invention relates to a reclining device having operating means for moving the pole and biasing means for biasing the pole in the lock position direction.

  This will be described with reference to FIGS. FIG. 7 is a diagram for explaining the locked state of the conventional reclining device, and FIG. 8 is a diagram for explaining the unlocked state of the reclining device of FIG.

  In these drawings, an inner tooth 3 along the circumferential direction is formed on an upper arm (first member) 1 connected to the seat back side.

  The lower arm (second member) 5 connected to the seat cushion side is provided so as to be rotatable relative to the upper arm 1 around the central axis O of the inner teeth 3 provided along the circumferential direction.

  Inside the internal teeth 3, poles 9 are arranged on the upper side and the lower side. Further, the lower arm 5 is formed with a protrusion 11 having a half-moon-shaped cross section that is a rotation center axis of the pole 9.

  A half-moon-shaped cutout hole 13 into which the protrusion 11 is fitted is formed on the surface of the pole 9 facing the inner teeth 3. Therefore, the pole 9 can rotate around the protrusion 11 of the lower arm 5. Further, the lower arm 5 is formed with a guide 14 for guiding the pole 9 to be rotatable.

  On the surface of the pole 9 facing the internal teeth 3, an external tooth 7 that can mesh with the internal teeth 3 on one side across the notch hole 13, and a stopper portion 15 that can contact the internal teeth 3 on the other side. Are formed respectively. Further, a lock portion 17 facing the outer teeth 7 and an unlocking portion 19 facing the stopper portion 15 are formed on the back surface of the pole 9 (the surface opposite to the surface facing the inner teeth 3). .

  On the back side of the pole 9, a cam (operating means) 20 that is rotatable about the central axis O of the internal teeth is disposed. When the cam 20 rotates and pushes the lock portion 17 of the pole 9, the pole 9 rotates to the lock position (see FIG. 7) where the outer teeth 7 mesh with the inner teeth 3, and the cam 20 unlocks the pole 9. When the portion 19 is pushed, the pole 9 rotates and moves to the unlock position (see FIG. 8) where the engagement between the external teeth 7 and the internal teeth 3 is released.

  Further, the cam 20 is urged by an urging means (not shown) in a direction in which the pole 9 rotates in the lock position direction.

  Next, the operation of the reclining device having the above configuration will be described. In the state shown in FIG. 7, the cam 20 pushes the lock portion 17 of the pole 9 on the lower arm 5 side by the biasing force of the biasing means (not shown). Therefore, the pole 9 is in a locked position where the outer teeth 7 mesh with the inner teeth 3 of the upper arm 1, and the reclining device is in a locked state in which relative rotation between the lower arm 5 and the upper arm 1 is prohibited.

  Here, if the cam 20 is rotated against the urging force of the urging means (not shown) and the unlocking portion 19 of the pole 9 is pushed, the pole 9 meshes with the external teeth 7 and the internal teeth 3 shown in FIG. The recliner is in an unlocked state in which the lower arm 5 and the upper arm 1 can be rotated relative to each other.

  When the desired reclining angle is obtained, when the operating force to the cam 20 is released, the pole 9 rotates and moves to a lock position where the external teeth 7 shown in FIG. 7 mesh with the internal teeth 3 of the upper arm 1. The reclining device is in a locked state in which relative rotation between the lower arm 5 and the upper arm 1 is prohibited.

European Patent No. 0024976

  However, in the reclining device shown in FIGS. 7 and 8, when the upper pole 9 moves from the locked position to the unlocked position, or when the upper pole 9 moves from the unlocked position to the locked position, the pole 9 is rotated by its own weight at the rotation center axis. There is a case in which the projection 9 is displaced from a certain projection 11 and the pole 9 is displaced from the rotation center axis.

  Therefore, there is a problem that a lock failure occurs in which the engagement between the inner teeth and the outer teeth becomes insufficient.

  The present invention has been made in view of the above problems, and an object thereof is to provide a reclining device that does not cause a lock failure.

  The invention according to claim 1 is a first member in which internal teeth along the circumferential direction are formed, a second member provided to be rotatable relative to the first member in the circumferential direction, and the second member. The pawl has external teeth that can be engaged with the internal teeth, the lock position where the external teeth mesh with the internal teeth, and the unlock position where the external teeth engage with the internal teeth. In a reclining device having an operating means for moving and an urging means for urging the pole in the lock position direction, a protrusion projecting toward the second member is provided on the pole, and the second member is provided with the protrusion It is a reclining device provided with the recessed part into which a protrusion fits rotatably.

  The invention according to claim 2 is the reclining device according to claim 1, wherein the protrusion of the pole is located at an end of the pole on the inner tooth side.

  The invention according to claim 3 is the reclining mechanism according to claim 1 or 2, characterized in that at least the projection of the pole is a quench hardening part by quenching.

  According to the first to third aspects of the present invention, the pole is provided with a protrusion protruding toward the second member, and the second member is provided with a recess in which the protrusion is rotatably fitted. Accordingly, the pole is prohibited from moving other than rotating with respect to the second member, and there is no positional deviation with respect to the rotation center axis. Therefore, there is no lock failure in which the engagement between the inner teeth and the outer teeth becomes insufficient.

  According to the invention which concerns on Claim 2, when the protrusion part of the said pole exists in the edge part by the side of the said inner tooth of the said pole, when the movement locus | trajectory of the external tooth of a pole meshes with an internal tooth and an external tooth, Since it is close to the ideal trajectory of the external teeth, the meshing becomes smooth.

  According to the invention which concerns on Claim 3, the intensity | strength of a protrusion is high because at least the protrusion of a pole serves as a hardening hardening part by quenching. Therefore, even when a large force that relatively rotates the first member and the second member acts on the reclining device in the locked state, the protrusion of the pole does not deform, and the external teeth of the pole and the internal teeth of the first member Will not be released.

It is a disassembled perspective view of the reclining apparatus of this Embodiment. It is an A direction arrow directional view of FIG. FIG. 3 is a cross-sectional view taken along a cutting line BB in FIG. 2. It is a C direction arrow directional view of the base plate of FIG. It is a figure explaining the locked state of the locking device of this embodiment. It is a figure explaining the unlocked state of the locking device of this embodiment. It is a figure explaining the locked state of the conventional reclining apparatus. It is a figure explaining the unlocked state of the reclining apparatus of FIG.

  Next, embodiments of the present invention will be described with reference to the drawings.

  The reclining apparatus of this Embodiment is demonstrated using FIGS. 1 is an exploded perspective view of the reclining device of the present embodiment, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, FIG. 3 is a cross-sectional view taken along line BB in FIG. FIG. 5 is a diagram for explaining a locked state of the locking device of the present embodiment, and FIG. 6 is a diagram for explaining an unlocked state of the locking device of the present embodiment.

  In FIG. 1, a ratchet (first member) 21 provided on the seat back side is formed by half-cutting a disk-like plate material by a press to form a circular recess 21a. Inner teeth 23 are formed in the entire circumferential direction on the inner circumferential surface of the circular recess 21a. A through hole 21b is formed at the center of the circular recess 21a.

  The base plate (second member) 25 provided on the seat cushion side is also formed by half-cutting a disk-shaped plate material by pressing to form a circular recess 25a. The diameter of the circular recess 25 a is set slightly larger than the outer diameter of the ratchet 21. The ratchet 21 is fitted in the circular recess 25a, and the base plate 25 and the ratchet 21 are rotatable relative to each other about the central axis O of the internal teeth 23 provided along the circumferential direction. A through hole 25 b is formed in the center of the ratchet 21.

  As shown in FIG. 3, the outer peripheral portion of the ratchet 21 and the outer peripheral portion of the base plate 25 are sandwiched by a ring-shaped outer peripheral ring 27. The center of the internal tooth 23 formed along the axis: the axis is held in a relatively rotatable manner without being separated in the direction of the axis O) in FIG.

  Returning to FIG. 1, a cam 31 is disposed in a space formed by the circular recess 21 a of the ratchet 21 and the circular recess 25 a of the base plate 25. A non-circular hole 31 a is formed at the center of the cam 31. An operation shaft (not shown) rotatably supported by the hole 21b of the ratchet 21 and the hole 25b of the base plate 25 is fitted into a non-circular (substantially oval) hole 31a, and the cam 31 is operated by the operation shaft. Is driven to rotate.

  Three poles 33 are arranged around the cam 31.

  Further, on the surface of the pole 33 facing the base plate 25, a protrusion 35 protruding toward the base plate 25 is formed at the end of the pole 33 on the inner tooth 23 side by half-punching. In the present embodiment, the cross-sectional shape in the direction orthogonal to the axis of the protrusion 35 of the pole 33 is based on the first arc portion 39 on the inner tooth 23 side and the diameter of the first arc portion 39 as shown in FIG. It is a substantially half-moon shape composed of the second arc portion 41 having a small diameter.

  On the other hand, the protrusion 35 of the pole 33 is rotatably engaged with the base plate 25, and a hole (concave portion) 37 penetrating the base plate 25 is formed. As shown in FIGS. 1 and 4, the cross-sectional shape of the hole 37 is smaller than the diameter of the third arc 43 on the inner tooth 23 side and the diameter of the third arc 43, and the second arc portion of the protrusion 35 of the pole 33. This is a substantially half-moon shape having a fourth arc 45 having the same diameter as that of 41 and an arc length longer than that of the second arc portion 41.

  Therefore, the rotation center axis of the pole 33 passes through the contact point of the second arc portion 41 of the protrusion 35 and the fourth arc 45 of the hole 37 and becomes an axis parallel to the center axis O of the internal teeth. In this embodiment, as shown in FIGS. 5 and 6, the rotation center axis (O ′) of the pole 33 is set in the vicinity of the internal tooth 32. The hole 37 may be a through hole or a bottomed hole.

  On the surface of the pole 33 that faces the internal teeth 23, external teeth 57 that can mesh with the internal teeth 23 on one side across the protrusion 35, and internal teeth that can contact the internal teeth 23 on the other side Each part 55 is formed. Further, on the back surface of the pole 33 (the surface opposite to the surface facing the inner teeth 23), a lock portion 59 facing the outer teeth 57 and an unlocking portion 61 facing the inner teeth facing portion 55 are formed. ing. Further, the entire pole 33 of the present embodiment is quenched.

  The cam 31 is formed with a cam portion 63 that extends in the radial direction and can be pressed against the lock portion 59 and the unlock portion 61 of each pole 33.

  On the surface of the base plate 25 facing the ratchet 21, a guide 51 that protrudes in the direction of the ratchet 21 and rotatably guides the pole 33 is formed by half-punching.

  As shown in FIGS. 5 and 6, the guide 51 includes a first guide portion 51 a that guides the side surface of the pole 33 on the outer tooth 57 side, and a second guide portion that guides the side surface of the pole 33 on the inner tooth facing portion 55 side. 51b and a stopper portion 51c that is connected to the second guide portion 51b and can contact the unlock portion 61 of the pole 33.

  As shown in FIGS. 1 and 2, the reclining device is attached to the frame on the seat back side on the surface exposed to the outside of the ratchet 21 (the surface opposite to the surface facing the base plate 25 of the ratchet 21). The protrusion 65 is formed by half-punching. On the surface exposed to the outside of the base plate 25 (the surface opposite to the surface facing the ratchet 21 of the base plate 25), a protrusion 67 for attaching the reclining device to the frame on the seat cushion side is formed by half punching. Has been.

  The pole 33 is biased in the lock position direction via the cam 31 by a spring (biasing member: not shown) whose one end is locked to the cam 31 and whose other end is locked to the base plate 25. Has been.

  Here, operation | movement of the reclining apparatus of this embodiment is demonstrated using FIG. 5, FIG.

  As shown in FIG. 5, when no operating force is applied to the cam 33, the cam portion 63 of the cam 33 pushes the lock portion 59 of each pole 33 by the biasing force of the biasing member. Accordingly, each pole 33 is in a locked position where the outer teeth 57 are engaged with the inner teeth 23 of the ratchet 21, and the relative rotation between the ratchet 21 and the base plate 25 is prohibited, and the seat back cannot rotate with respect to the seat cushion. (Locked). At this time, the internal teeth facing portion 55 of the pole 33 is located away from the internal teeth 23.

  When the cam 33 is rotated by operating an operation shaft (not shown) against the urging force of the urging member, the cam portion 63 pushes the unlock portion 61 of each pole 33. Then, as shown in FIG. 6, each pole 33 moves to the unlocked position where the engagement between the outer teeth 57 and the inner teeth 23 of the ratchet 21 is released, and the ratchet 21 and the base plate 25 can be rotated relative to each other. The seat back is rotatable with respect to the seat cushion. The operation shaft (not shown) can be operated until the unlocking portion 61 of the pole 33 contacts the stopper portion 51c of the guide 51.

  When the operation force to the operation shaft is released, the pole 33 returns to the locked position where the outer teeth 57 mesh with the inner teeth 23 of the ratchet 21 by the urging force of the urging member, as shown in FIG. And relative rotation between the base plate 25 and the base plate 25 are prohibited, and the locked state is established again.

  According to the reclining device having such a configuration, the following effects can be obtained.

 (1) The pole 33 is provided with a projection 35 serving as a rotation center axis, and the base plate 25 is provided with a hole 37 in which the projection 35 is rotatably fitted. Movement is prohibited. Therefore, the positional deviation of the pole 33 with respect to the rotation center axis O ′ does not occur, and the locking failure that the engagement between the inner teeth 23 and the outer teeth 57 becomes insufficient does not occur.

 (2) Since the protrusion 35 of the pole 33 is located at the end of the pole 33 on the inner tooth 23 side, the movement locus of the outer tooth 57 of the pole 33 is ideal when the inner tooth 23 and the outer tooth 57 are engaged with each other. Since it becomes close to a typical movement trajectory, the meshing becomes smooth.

 (3) Since the protrusion 35 of the pole 33 is a quench hardening part by quenching, the strength of the protrusion 35 is increased. Therefore, even when a large force that relatively rotates the ratchet 21 and the base plate 25 acts on the reclining device in the locked state, the protrusion 35 of the pole 33 is not deformed, and the external teeth 57 of the pole 33 and the internal teeth of the ratchet 21 The meshing with 23 is not released.

  The present invention is not limited to the above embodiment. In the above embodiment, the ratchet 21 is provided on the seat back side and the base plate 25 is provided on the seat cushion side. Conversely, the base plate 25 may be provided on the seat back side and the ratchet 21 may be provided on the seat cushion side.

  In the above embodiment, three poles 33 are provided, but one pole may be provided, or two or four or more may be provided.

  Furthermore, the pole 33 may be quenched by at least the protrusion 35 alone.

21 Ratchet (first member)
25 Base plate (second member)
31 Cam 33 Pole 35 Protrusion 43 Hole (concave)

Claims (3)

A first member formed with internal teeth along the circumferential direction;
A second member provided to be rotatable relative to the first member in the circumferential direction;
A pole rotatably provided on the second member and having external teeth that can mesh with internal teeth;
An operating means for moving the pole to the locked position where the external teeth mesh with the internal teeth, and the unlocked position where the meshing between the external teeth and the internal teeth is released;
Urging means for urging the pole toward the lock position;
In a reclining device having
Providing the pole with a protrusion protruding toward the second member,
A reclining device, wherein the second member is provided with a recess in which the protrusion is rotatably fitted.   The reclining device according to claim 1, wherein a protrusion of the pole is located at an end of the pole on the inner tooth side.   The reclining mechanism according to claim 1, wherein at least the protrusion of the pole is a quench hardening portion by quenching.

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