JP4517748B2 - Vehicle seat reclining device - Google Patents

Description

  The present invention relates to a vehicle seat reclining device.

  Conventionally, various types of vehicle seat reclining devices for inclining the seat back with respect to the seat cushion have been proposed (for example, Patent Documents 1 and 2). Such a vehicle seat reclining device includes a lock / unlock mechanism so that the seat back can be adjusted and held at a required inclination angle suitable for occupant seating or the like.

  FIG. 3 is a schematic view showing an example of a lock / unlock mechanism provided in such a vehicle seat reclining device. The lock / unlock mechanism is configured to engage the inner teeth 91a of the upper arm 91 on the seat back frame side with the outer teeth 92a of the lock plate 92 housed in the lower arm on the seat cushion frame side, thereby allowing the seat cushion (seat cushion frame ) Is held (locked) at a predetermined inclination angle. On the other hand, the lock / unlock mechanism retreats the lock plate 92 in the radial direction by rotating the operation lever or the like, and releases the engagement of the inner teeth 91a and the outer teeth 92a, thereby rotating the seat back relative to the seat cushion. The movement is allowed (unlocked) and the seat back can be adjusted to the required tilt angle.

The inner teeth 91a of the upper arm 91 are selectively formed in a predetermined angle range corresponding to the range where the inclination angle needs to be maintained (locked), and the angle range (A) where the inner teeth 91a are not formed. Is a non-gear portion 91b. The lock / unlock mechanism allows the seat back to rotate relative to the seat cushion regardless of the operation of the operation lever when a part of the outer teeth 92a of the lock plate 92 overlaps the non-gear portion 91b in the circumferential direction. (Unlock). Therefore, the lock / unlock mechanism continuously maintains the unlocked state of the above inclination angle in a range where a part of the external teeth 92a of the lock plate 92 overlaps the non-gear portion 91b in the circumferential direction. By exceeding, the same inclination angle can be locked again.
JP 2001-17259 A JP 2000-31623 A

  By the way, in order to lock the inclination angle of the seat back at a predetermined high strength, a predetermined circumferential width (B) is set on the outer teeth 92a in order to secure the meshing force of the inner teeth 91a and the outer teeth 92a. There is a need. Accordingly, in the angle range corresponding to the angle range A and the width B continuous on both sides thereof, the tilt angle is unlocked in the above-described manner. Accordingly, in order to increase the range of the tilt angle at which the seat back can be locked, when the angle range where the unlocked state is reduced is reduced, the angle range corresponding to at least the width B, no matter how small the angle range A is. It is forced to unlock the tilt angle. In other words, for example, even if an attempt is made to set the seat back to a predetermined inclination angle so as to be used for a predetermined application other than sitting, if the inclination angle at that time corresponds to the unlocked state, the lock at the inclination angle is not performed. However, its use is naturally restricted.

  An object of the present invention is to provide a vehicle seat reclining device capable of locking an inclination angle of a seat back with respect to a seat cushion at a predetermined inclination angle that is originally unlocked.

  In order to solve the above-mentioned problem, the invention according to claim 1 is attached to either the seat cushion side or the seat back side, and has an inner tooth and a non-gear portion selectively within a predetermined angle range. 1 arm and a second arm that is attached to either the seat cushion side or the seat back side and supports a lock plate having external teeth so as to be slidable in the radial direction, and the external teeth are arranged in the entire circumferential direction. Engaging with the inner teeth over the span to regulate the relative rotation of the first and second arms to lock the inclination angle of the seat back with respect to the seat cushion, and at least a part of the outer teeth around the periphery. The angle of inclination of the seat back with respect to the seat cushion is allowed by allowing relative rotation of the first and second arms by overlapping the non-gear portion in the direction. In the vehicle seat reclining device for locking, a locking means for locking a predetermined inclination angle of the seat back with respect to the seat cushion in a state where at least a part of the outer teeth overlaps the non-gear portion in the circumferential direction is provided. This is the gist.

  According to a second aspect of the present invention, in the vehicle seat reclining device according to the first aspect, an operation lever that is rotatably connected to the second arm and has an operation lever side engaging portion, the operation lever, And a link having a link-side engaging portion that is rotatably connected to the second arm at a different rotation center, and the link includes the operation lever-side engaging portion by a rotation operation of the operation lever. Rotating by engagement with the link side engaging portion, retreating the lock plate in the radial direction to release the engagement between the outer teeth and the inner teeth, and when the operation lever is not operated, The gist is that a gap is set between the operating lever side engaging portion and the link side engaging portion.

  The invention according to claim 3 is the vehicle seat reclining device according to claim 1, wherein the vehicle seat reclining device is rotatably connected to the second arm, and transmits an operating force for retracting the lock plate in the radial direction. An operation lever for releasing the engagement between the external teeth and the internal teeth is provided, and a lock release means for releasing the locked state at the predetermined inclination angle by the lock means according to the transmission of the operation force. The gist.

  According to a fourth aspect of the present invention, in the vehicle seat reclining device according to the third aspect, the locking means is connected to a lock pin that rotates integrally with the first arm and the second arm, and And a hook for hooking the lock pin at an inclination angle of.

  According to a fifth aspect of the present invention, in the vehicle seat reclining device according to the fourth aspect, the locking release means is provided in a lever side engaging portion provided in the operation lever, and in the hook. A hook-side engagement portion that engages with the lever-side engagement portion in accordance with transmission of an operation force that causes the lock plate to retreat in the radial direction by the operation lever and releases the lock pin from being hooked by the hook. Is the gist.

  According to a sixth aspect of the present invention, in the vehicle seat reclining device according to the fifth aspect, a gap is provided between the lever side engaging portion and the hook side engaging portion when the operating lever is not operated. The gist is that it is set.

  As described above in detail, in the invention according to claim 1, the seat back with respect to the seat cushion in which at least a part of the external teeth overlaps with the non-gear portion in the circumferential direction, that is, in an originally unlocked state. The predetermined inclination angle can be locked by the locking means.

  According to a second aspect of the present invention, when the operation lever is not operated, a gap is set between the operation lever side engaging portion and the link side engaging portion, for example, manufacturing variation or assembly. Even if an error or the like occurs, it is possible to suppress the interference in the range of the gap so that the interference directly occurs. And, when the operation lever is not operated, a so-called half-lock state in which the operation lever side engaging portion engages with the link side engaging portion on the side where the engagement between the external teeth and the internal teeth is released. Can be prevented.

  According to a third to fifth aspect of the present invention, the locking state of the predetermined inclination angle by the locking means is in accordance with the transmission of the operating force that causes the lock plate to be retracted in the radial direction by the operating lever. Released by means. Accordingly, when the locked state at the predetermined inclination angle is released, the engagement between the outer teeth and the inner teeth is released at the same time, so that the relative rotation of the first and second arms is allowed and the The inclination angle of the seat back with respect to the seat cushion can be adjusted. In this way, the locked state at the predetermined inclination angle can be released by one operation of the same operation lever, and the transition to the adjustment of the inclination angle of the seat back can be continued smoothly.

  In the invention according to claim 6, when the operating lever is not operated, a gap is set between the lever side engaging portion and the hook side engaging portion, for example, manufacturing variations and assembly errors. Even if it occurs, it is possible to suppress direct interference by absorbing within the range of the gap. And preventing the so-called half-locked state in which the lever-side engaging portion engages with the hook-side engaging portion on the side of releasing the hook of the lock pin by the hook when the operation lever is not operated. Can do.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a side view showing a skeleton part of a vehicle seat reclining device mounted on a vehicle such as an automobile, and FIG. 2 is a side view showing some members of FIG. 1 omitted for convenience. 1 and 2, the right side corresponds to the rear side of the vehicle. When the extending direction of the seat back in FIG. 1 with respect to the seat cushion is represented by a straight line L1, FIG. 2 corresponds to a state in which the extending direction of the seat back is tilted backward until the straight line L2 is aligned. This state is set, for example, when the seatback is tilted backward and used as a table for the rear seat. The skeleton parts shown in FIGS. 1 and 2 are basically arranged in pairs in the width direction of the vehicle seat, and here, the skeleton parts shown on the left side toward the front of the vehicle are shown. Yes.

  As shown in FIGS. 1 and 2, the vehicle seat reclining device is fixed to the lower arm 12 and the lower bracket 13 (see FIG. 1) as the second arm fixed to the seat cushion frame 11, and to the seat back frame 14. An upper arm 15 as a first arm, an upper bracket 16 fixed to the upper arm 15, a lock / unlock mechanism 17 (see FIG. 2), a link 18, an operation lever 19, and a hook 20. ing. The seat cushion frame 11 forms a skeleton of the seat cushion, and the seat back frame 14 forms a skeleton of the seat back.

  The upper arm 15 is rotatably connected to the lower arm 12 via a lock / unlock mechanism 17. As will be described later, the lock / unlock mechanism 17 switches between a state in which the relative rotation of the lower arm 12 and the upper arm 15 is restricted and a state in which the lower arm 12 is allowed to be allowed, and a seat back (seat back frame) with respect to the seat cushion (seat cushion frame 11). 14) Switching between tilt angle lock and unlock.

  As shown in FIG. 1, the lower arm 12 has an arcuate engagement extending above the rotational center O <b> 1 of the upper arm 15 to the outside in the width direction of the vehicle seat (the front side perpendicular to the paper surface in FIG. 1). A piece 12a is provided. On the other hand, the upper bracket 16 is provided with an arcuate locking piece 16a extending outward in the width direction of the vehicle seat on the outer peripheral side of the rotation center O1 with respect to the locking piece 16a. And one end and the other end of the spiral spring 21 are each latched by these latching pieces 12a and 16a. The spiral spring 21 is wound in the clockwise direction in the figure from the inner peripheral side to the outer peripheral side. Accordingly, the upper bracket 16 is rotated in the clockwise direction in the figure by inclining the seat back frame 14 to the rear of the vehicle. Compressed. The spiral spring 21 generates an urging force for rotating the seat back frame 14 counterclockwise in the drawing with respect to the seat cushion frame 11, and raises the seat back (seat back frame 14) tilted rearward. Assist the operating force.

  As shown in FIG. 2, the upper arm 15 is formed with a bottomed cylindrical accommodating portion 15a concentric with the rotation center O1. And the inner tooth 15b and the non-gear part 15c are selectively formed in the predetermined | prescribed angular range in the internal peripheral surface of this accommodating part 15a. The non-gear portion 15c forms a circumferential surface having an inner diameter equivalent to the tip circle of the inner tooth 15b.

  On the other hand, the lower arm 12 is formed with a pair of guide grooves 12b facing the accommodating portion 15a and communicating in opposite radial directions concentric with the rotation center O1. In a state where the lower arm 12 and the upper arm 15 are assembled, the inner peripheral surface (the inner tooth 15b or the non-gear portion 15c) of the accommodating portion 15a is opposed to the radial direction of the guide groove 12b. The internal teeth 15b, the non-gear portion 15c, and the guide groove 12b constitute a part of the lock / unlock mechanism 17.

  The lock / unlock mechanism 17 includes a cam plate 22, a cam 23, a plurality (two) of lock plates 24, and a rotation shaft 25 that is rotatably connected to the lower arm 12 at a rotation center O <b> 1. And.

  The cam plate 22 is connected so as to rotate integrally with the rotating shaft 25, and is formed with a cam hole 22a that makes a pair in opposite radial directions. The cam hole 22a is inclined with respect to the circumferential direction. The cam 23 is connected to the rotating shaft 25 together with the cam plate 22 so as to rotate integrally therewith, and a cam surface 23a that forms a pair in opposite radial directions is formed. The cam surface 23a is disposed on the inner peripheral side with respect to the cam hole 22a.

  The lock plate 24 is supported by the lower arm 12 so as to be mounted in the guide groove 12b, and the movement (slide) in the radial direction is guided by sliding contact with the inner surface of the guide groove 12b. An outer tooth 24 a that meshes with the inner tooth 15 b of the upper arm 15 is formed at the tip of the lock plate 24.

  In addition, a protrusion 24 b that protrudes in parallel with the axial direction is formed at the center of the lock plate 24. The lock plate 24 is engaged with the protrusion 24 b by inserting the protrusion 24 b into the cam hole 22 a of the cam plate 22. Furthermore, the end surface on the inner peripheral side of the lock plate 24 forms a lock plate cam surface 24c. The lock plate cam surface 24c extends so as to have an inclination angle with respect to the pitch circle of the external teeth 24a. The lock plate 24 is engaged with the lock plate cam surface 24c when the cam surface 23a of the cam 23 abuts against the lock plate cam surface 24c.

  Here, in a state where the outer teeth 24a of the lock plate 24 mesh with the inner teeth 15b of the upper arm 15 over the entire circumferential direction, the relative rotation of the lower arm 12 and the upper arm 15 is restricted, and the inclination of the seat back with respect to the seat cushion is suppressed. The angle is locked. In this state, when the cam plate 22 and the cam 23 are rotated in one side direction (counterclockwise direction in FIG. 2), the lock plate 24 is guided by the projection 24b being pressed against the cam hole 22a of the cam plate 22. It moves so as to be drawn in the radial direction along the groove 12b. At this time, the engagement between the outer teeth 24a of the lock plate 24 and the inner teeth 15b of the upper arm 15 is released, thereby allowing relative rotation of the lower arm 12 and the upper arm 15. Then, the inclination angle of the seat back with respect to the seat cushion can be adjusted.

  On the other hand, when the cam plate 22 and the cam 23 rotate in the other direction (clockwise direction in FIG. 2), the protrusion 24b of the lock plate 24 is pressed against the cam hole 22a of the cam plate 22, and the lock plate cam surface. When 24c is pressed by the cam surface 23a, it moves so that it may protrude radially along the guide groove 12b. At this time, when the outer teeth 24a of the lock plate 24 overlap with the inner teeth 15b of the upper arm 15 over the entire circumferential direction, the outer teeth 24a and the inner teeth 15b mesh with each other, and the relative rotation of the lower arm 12 and the upper arm 15 occurs. Movement is regulated. Then, the inclination angle of the seat back with respect to the seat cushion is locked. When at least a part of the outer teeth 24a overlaps the non-gear portion 15c of the upper arm 15 in the circumferential direction (the state shown in FIG. 2), the outer teeth 24a and the inner teeth 15b cannot be engaged with each other, and the lower arm 12 and The relative rotation of the upper arm 15 is allowed. Then, the inclination angle of the seat back with respect to the seat cushion is unlocked. In other words, the lock / unlock mechanism 17 does not lock the seat back at the corresponding inclination angle when at least a part of the outer teeth 24a overlaps the non-gear portion 15c of the upper arm 15 in the circumferential direction.

  The lock / unlock mechanism 17 urges the lock plate 24 (outer teeth 24a) to protrude radially, that is, toward the inner peripheral surface (inner teeth 15b, non-gear portion 15c) of the housing portion 15a. A force member (not shown) is provided. Therefore, when the outer teeth 24a of the lock plate 24 overlap the inner teeth 15b of the upper arm 15 over the entire circumferential direction, the lock / unlock mechanism 17 holds these meshes with the biasing member, and Maintain the corresponding inclination angle of the back.

  The link 18 is connected so as to rotate integrally with the rotating shaft 25, and a link side engaging pin 18a as a link side engaging portion projects from a tip end portion extending downward. ing.

  The operation lever 19 is rotatably connected to the lower bracket 13 at a rotation center O2 at the lower rear of the rotation center O1. In other words, the operation lever 19 is rotatably connected to the lower arm 12 via the lower bracket 13. The operation lever 19 has a first pressing surface 19a as an operation lever side engaging portion that is disposed in front of the rotation center O2 and faces the link side engagement pin 18a of the link 18 in the clockwise rotation shown in the drawing. is doing. The first pressing surface 19a is a flat surface along the radial direction of the rotation center O2. Accordingly, when the operation lever 19 is rotated in the clockwise direction in the drawing, the first pressing surface 19a presses the link side engaging pin 18a, and the link 18 is rotated in the counterclockwise direction in the drawing. The inclination angle of the seat back with respect to the seat cushion can be adjusted in the above-described manner by the rotation of the interlocked cam plate 22 and cam 23. The operation lever 19 has a second pressing surface 19b as a lever side engaging portion disposed behind the rotation center O2. The second pressing surface 19b is a protruding surface that protrudes in the radial direction of the rotation center O2.

  The operating lever 19 is held at its rotational position by a biasing member (not shown), and a gap C1 is set between the first pressing surface 19a and the link-side engagement pin 18a at the position. ing. Therefore, normally (when the operation lever 19 is not operated), the operation lever 19 does not interfere with the link 18.

  The hook 20 is rotatably connected to the lower bracket 13 at a rotation center O2. That is, the hook 20 is rotatably connected to the lower arm 12 via the lower bracket 13. The hook 20 extends to the rear of the rotation center O2, and the other end of the coil spring 26 whose one end is locked to the lower bracket 13 is locked to the side rotated counterclockwise in the drawing. It is energized. The hook 20 is restricted from turning in the direction by a restriction means (not shown), and its turning position is positioned. The tip surface of the hook 20 forms a guide surface 20a that is inclined with respect to the circumferential direction of the rotation center O1. In addition, the hook 20 has a locking groove 20b that is continuous with the guide surface 20a and is recessed on one side in the circumferential direction (right side in FIG. 1) of the rotation center O2.

  Here, a lock pin 27 projects from the upper bracket 16 on one side in the circumferential direction of the rotation center O1 (the right side in FIG. 1). The lock pin 27 is positioned at the pivot position where the hook 20 is positioned, and the guide surface 20a and the substantially deepest portion of the locking groove 20b face each other in the circumferential direction of the pivot center O1. Therefore, when the upper arm 15 together with the upper bracket 16 rotates with respect to the lower arm 12 in the clockwise direction in the figure, the lock pin 27 presses the guide surface 20a, and the hook 20 is moved in the clockwise direction in the figure against the coil spring 26. Rotate. When the lock pin 27 reaches the tip along the guide surface 20a, the coil spring 26 is elastically restored, so that the lock pin 27 is fitted into the locking groove 20b and locked (hooked) by the hook 20. . Then, relative rotation of the lower arm 12 and the upper arm 15 is restricted, and a predetermined inclination angle of the seat back with respect to the seat cushion (an inclination angle shown in FIG. 2 in which the extending direction of the seat back coincides with the straight line L2) is locked. .

  As shown in FIG. 2, when the lock pin 27 is locked to the hook 20, the outer teeth 24 a overlap the non-gear portion 15 c of the upper arm 15 in the circumferential direction. That is, the lock pin 27 and the hook 20 lock a predetermined inclination angle when the inclination angle of the seat back with respect to the seat cushion is unlocked in the lock / unlock mechanism 17.

  The hook 20 has a hook-side engaging pin 20c as a hook-side engaging portion facing the second pressing surface 19b on one side in the circumferential direction of the rotation center O2. Accordingly, when the operation lever 19 is rotated in the clockwise direction in the drawing, the second pressing surface 19b presses the hook-side engagement pin 20c, thereby rotating the hook 20 in the clockwise direction in the drawing, and the locking groove. 20b is disengaged from the lock pin 27, and the locking (hanging) of the lock pin 27 by the hook 20 is released. At this time, in the lock / unlock mechanism 17, since the inclination angle of the seat back with respect to the seat cushion is in the unlocked state, the inclination angle can be adjusted together.

  Incidentally, a gap C2 is set between the second pressing surface 19b and the hook-side engagement pin 20c at the above-described rotational position where the operation lever 19 is held. Therefore, normally (when the operation lever 19 is not operated), the operation lever 19 does not interfere with the hook 20.

  Next, the operation of the vehicle seat reclining device will be generally described. First, it is assumed that the outer teeth 24a of the lock plate 24 mesh with the inner teeth 15b of the upper arm 15 over the entire circumferential direction, and the inclination angle of the seat back with respect to the seat cushion is locked. In this state, when the operation lever 19 is rotated in the clockwise direction in the drawing, the link 18 is rotated in the counterclockwise direction in the drawing by the first pressing surface 19a pressing the link side engaging pin 18a. Then, the cam plate 22 and the cam 23 rotate integrally with the link 18 via the rotation shaft 25, so that the lock plate 24 moves (slides) so as to be drawn in the radial direction along the guide groove 12b. At this time, the engagement between the outer teeth 24a of the lock plate 24 and the inner teeth 15b of the upper arm 15 is released, and the inclination angle of the seat back with respect to the seat cushion can be adjusted.

  After adjusting the required inclination angle in this state, when the operation force of the operation lever 19 is released, the lock plate 24 (outer teeth 24a) protrudes in the radial direction, that is, the inner peripheral surface (inner surface of the accommodating portion 15a). The tooth 15b and the non-gear portion 15c) are biased and moved (slid). At this time, if the outer teeth 24a of the lock plate 24 again mesh with the inner teeth 15b of the upper arm 15 over the entire circumferential direction, the inclination angle at that time is locked. On the other hand, when at least a part of the outer teeth 24a overlaps the non-gear portion 15c of the upper arm 15 in the circumferential direction, the outer teeth 24a and the inner teeth 15b cannot be engaged with each other, and the inclination angle of the seat back with respect to the seat cushion is increased. Unlocked. That is, in this state, the seat back is basically rotatable (tilted) with respect to the seat cushion.

  However, when the seat back is tilted rearward in this state, the lock pin 27 provided on the upper bracket 16 is fitted into the locking groove 20b while pressing the guide surface 20a against the coil spring 26. To be hooked to the hook 20. At this time, relative rotation of the lower arm 12 and the upper arm 15 is restricted, and a predetermined inclination angle of the seat back with respect to the seat cushion at this time (an inclination angle shown in FIG. 2 in which the extending direction of the seat back coincides with the straight line L2). Is locked.

  Further, in this state, when the operation lever 19 is rotated in the clockwise direction in the figure, the second pressing surface 19b presses the hook side engaging pin 20c, whereby the hook 20 is rotated in the clockwise direction in the figure. . At this time, the locking of the lock pin 27 by the hook 20 is released. At the same time, since the tilt angle of the seat back with respect to the seat cushion is in the unlocked state in the lock / unlock mechanism 17, the tilt angle can be continuously adjusted.

As described above in detail, according to the present embodiment, the following effects can be obtained.
(1) In the present embodiment, a predetermined inclination angle of the seat back with respect to the seat cushion in which at least a part of the outer teeth 24a overlaps the non-gear portion 15c in the circumferential direction, i.e., originally in an unlocked state. It can be locked by the hook 20 and the lock pin 27. Therefore, for example, the predetermined inclination angle is set to an inclination angle (an inclination angle used as a table in the present embodiment) that can be used for a predetermined application other than seating, and is locked at the inclination angle. The degree of freedom of use can be increased.

  (2) In this embodiment, when the operation lever 19 is not operated, the gap C1 is set between the first pressing surface 19a and the link-side engagement pin 18a. Even if an assembling error or the like occurs, it is possible to suppress the interference in the range of the gap C1 by directly absorbing them. When the operation lever 19 is not operated, the first pressing surface 19a engages with the link-side engagement pin 18a on the side where the external teeth 24a and the internal teeth 15b are disengaged. A locked state can be prevented.

  (3) In the present embodiment, the lock state of the predetermined inclination angle by the hook 20 and the lock pin 27 is in accordance with the transmission of the operation force for retracting the lock plate 24 in the radial direction by the operation lever 19. 2 Release by engagement of the pressing surface 19b and the hook side engaging pin 20c. Accordingly, when the lock state at the predetermined inclination angle is released, the engagement between the outer teeth 24a and the inner teeth 15b is released at the same time, and therefore the relative rotation of the lower arm 12 and the upper arm 15 is allowed. The inclination angle of the seat back with respect to the seat cushion can be adjusted. In this way, the locked state at the predetermined inclination angle can be released by one operation of the same operation lever, and the transition to the adjustment of the inclination angle of the seat back can be continued smoothly.

  (4) In this embodiment, when the operation lever 19 is not operated, the gap C2 is set between the second pressing surface 19b and the hook-side engagement pin 20c. Even if an assembling error or the like occurs, it is possible to suppress the interference in the range of the gap C2 to directly interfere with these. When the operation lever 19 is not operated, the second pressing surface 19b engages with the hook-side engagement pin 20c on the side where the hook 20 releases the lock pin 27. Can be prevented.

  (5) In this embodiment, a sufficient meshing force between the inner teeth 15b of the upper arm 15 and the outer teeth 24a of the lock plate 24 can be secured, and the inclination angle of the seat back can be maintained with a required strength.

In addition, you may change the said embodiment as follows.
-In the said embodiment, you may employ | adopt the shape which shifts the internal teeth 15b of the upper arm 15 and the external teeth 24a of the lock plate 24 to an axial direction, and cannot mesh | engage as a non-gear part.

In the above embodiment, the lower arm 12 may be provided with internal teeth and a non-gear portion, and the upper arm 15 may support a lock plate or the like.
In the above-described embodiment, the hook 20 and the lock pin 27 lock the predetermined inclination angle that tilts the seat back backward. For example, the hook 20 and the lock pin 27 may be locked at the predetermined inclination angle that tilts the seat back forward. Good. Such a change can be easily dealt with by changing the arrangement of the hook 20 and the lock pin 27 and the like.

In the embodiment, for example, the number of the lock plates 24 may be one or three or more.
-In the said embodiment, the use of the lock | rock of the predetermined inclination angle by the hook 20 and the lock pin 27 may be a use for making the back view of the seated person (driver | operator etc.) of a front seat favorable, for example.

  The above embodiment may be changed as appropriate without departing from the spirit of the present invention.

The side view which shows one Embodiment of this invention. The side view which shows the same embodiment. The schematic diagram which shows a conventional form.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 ... Lower arm as 2nd arm, 15 ... Upper arm as 1st arm, 15b ... Internal tooth, 15c ... Non-gear part, 18 ... Link, 18a ... Link side engaging pin as link side engaging part, 19 ... Operation lever, 19a: first pressing surface as an operation lever side engaging portion, 19b: second pressing surface as a lever side engaging portion constituting locking release means, 20 ... hook constituting a locking means, 20c ... Hook-side engaging pins as hook-side engaging parts constituting the locking release means, 24 ... Lock plate, 24a ... External teeth, 27 ... Lock pins constituting the locking means.

Claims (6)

A first arm attached to either the seat cushion side or the seat back side and selectively having internal teeth and a non-gear portion within a predetermined angular range;
A second arm that is attached to either the seat cushion side or the seat back side and supports a lock plate having external teeth so as to be slidable in the radial direction;
The outer teeth mesh with the inner teeth over the entire circumferential direction to restrict the relative rotation of the first and second arms to lock the inclination angle of the seat back with respect to the seat cushion, and A vehicle seat reclining in which at least a part of the teeth overlaps the non-gear portion in the circumferential direction to allow relative rotation of the first and second arms and unlock an inclination angle of the seat back with respect to the seat cushion. In the device
A vehicle seat reclining comprising locking means for locking a predetermined inclination angle of the seat back with respect to the seat cushion in a state where at least a part of the external teeth overlaps the non-gear portion in a circumferential direction. apparatus. The vehicle seat reclining device according to claim 1,
An operation lever rotatably connected to the second arm and having an operation lever side engaging portion;
A link rotatably connected to the second arm at a rotation center different from the operation lever, and having a link side engaging portion;
The link is rotated by the engagement of the operation lever side engagement portion and the link side engagement portion by the rotation operation of the operation lever, and the lock plate is retreated in the radial direction to thereby move the external teeth and the link. Release the mesh with the internal teeth,
A vehicle seat reclining device, wherein a gap is set between the operation lever side engagement portion and the link side engagement portion when the operation lever is not operated. The vehicle seat reclining device according to claim 1,
An operation lever that is rotatably connected to the second arm, transmits an operation force for retreating the lock plate in the radial direction, and releases the meshing between the outer teeth and the inner teeth;
A vehicle seat reclining device, comprising: a locking release unit that releases the locked state of the predetermined inclination angle by the locking unit in accordance with the transmission of the operation force. The vehicle seat reclining device according to claim 3,
The locking means is
A lock pin that rotates integrally with the first arm;
A vehicle seat reclining device comprising: a hook coupled to the second arm and hooking the lock pin at the predetermined inclination angle. The vehicle seat reclining device according to claim 4,
The unlocking means is
A lever side engaging portion provided on the operation lever;
A hook side that is provided on the hook and engages with the lever side engaging portion in accordance with transmission of an operation force that causes the lock plate to be retracted in the radial direction by the operation lever and releases the lock pin by the hook. A vehicle seat reclining device comprising an engaging portion. The vehicle seat reclining device according to claim 5,
A vehicle seat reclining device, wherein a gap is set between the lever side engaging portion and the hook side engaging portion when the operating lever is not operated.

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