JP4559138B2 - Reclining device - Google Patents

Description

  The present invention relates to a reclining device that is provided in a vehicle seat or the like and appropriately adjusts an inclination angle of a seat back with respect to a seat cushion.

  2. Description of the Related Art Conventionally, a reclining device interposed between a seat cushion and a seat back includes a seat cushion and a guide bracket fixed to the seat back that is tiltably attached to the seat cushion, a seat cushion, and a seat. An internal gear fixed to the other side of the back and connected to the guide bracket so as to be rotatable relative to the guide bracket.

  The reclining device includes a cam that is interposed between the guide bracket and the internal gear and that is connected to a support shaft concentric with the rotation center of the internal gear relative to the guide bracket and rotates together with the support shaft. Is provided. This cam slides a lock gear having a locking tooth on the tip surface in the radial direction between the guide bracket and the internal gear as the support shaft rotates. Further, the guide bracket is provided with a guide groove having opposing walls extending in the radial direction, and the locking gear slides in the guide groove by the rotation of the cam, so that the locking teeth protrude from the guide groove. It is like that.

  On the other hand, the internal gear is formed with an internal tooth along an arcuate locus concentric with the rotation center, and the lock gear protrudes outward from the guide groove by the rotation of the cam, and the locking tooth is the internal gear. By engaging the teeth, the relative rotation between the guide bracket and the internal gear is restricted, and the reverse rotation of the cam releases the engagement of the locking teeth with the internal teeth, so that the guide bracket and the internal gear are released. And can rotate relative to each other.

  Therefore, by attaching an operation lever to the support shaft and rotating the support shaft by operating this operation lever, the locking teeth can be engaged with the internal teeth to lock the seat back, while the locking teeth and the internal It is possible to change the tilt position by releasing the mesh with the teeth (for example, see Patent Document 1).

  In addition, a plurality of lock gears that slide in the radial direction by rotation of the cam are provided at predetermined intervals, and an auxiliary lock gear is provided between the plurality of lock gears. When a large load is applied to the seat back, the locking teeth of the auxiliary lock gear are provided. Has been proposed that counteracts a heavy load applied by a vehicle collision or the like (see, for example, Patent Document 2).

JP 2000-342370 A (page 4-5, FIG. 5) JP 2000-245561 A (page 4-5, FIG. 3)

  In the reclining device described in Patent Document 1, when a heavy load is applied to the seat back and the lock gear compresses the side wall of the guide groove to cause a slippage, the lock gear tilts and the locking gear locking teeth and internal teeth There is a case where the meshing state becomes sweet and the lock strength decreases. In the case of this reclining device, two lock gears having locking teeth are provided. However, in a normal seat in which a heavy load applied to the seat back due to a vehicle collision or the like is received by the vehicle body via the seat belt. Even if it has sufficient locking strength, in the case of a belt-in seat (seat with a built-in shoulder belt) where all heavy loads are applied to the reclining device via the seat back, it could not be handled without using an extremely large reclining device. .

  On the other hand, in the reclining device described in Patent Document 2, the auxiliary lock gear meshes with the internal teeth when the limit torque is exceeded due to the input of a large load, and both the lock gear and the auxiliary lock gear can counter the large load. It was not easy to stabilize and there was still room for improvement.

  The present invention has been made in view of such problems of the prior art, and can significantly improve the lock strength without increasing the size of the reclining device, and can be applied to a belt-in seat. The object is to provide a reclining device.

In order to achieve the above object, the invention according to claim 1 of the present invention includes a guide bracket fixed to either one of a seat cushion and a seat back that is tiltably attached to the seat cushion, An internal gear fixed to the other of the seat cushion and the seat back, a cam rotatably mounted between the guide bracket and the internal gear, and a radial slide in conjunction with the rotation of the cam A pair of lock gears and a pair of auxiliary lock gears that slide in the radial direction in linkage with the lock gears, and the pair of lock gears is rotated by the cams, and the locking teeth and the internal teeth of the internal gears a meshing position to mesh, with slides in the radial direction between the engagement release position where engagement is released and the inner teeth of the engaging teeth and the internal gear of the pair of lock gears, the pair Each lock gear has a pair of auxiliary lock gears operating member, with the radial sliding between the engagement position and disengagement position of the pair of lock gears, the pair of auxiliary lock gears by the pair of auxiliary lock gears operating member, Between the engagement position where the engagement teeth mesh with the internal teeth of the internal gear, and the mesh release position where the engagement teeth of the pair of auxiliary lock gears and the internal teeth of the internal gear are released. It is characterized by sliding in the radial direction.

The invention according to claim 2, characterized in that the sliding direction of the sliding direction and the pair of auxiliary lock gears of the pair of lock gears are orthogonal.

Furthermore, in the invention according to claim 3, each of the pair of auxiliary lock gears has two concave portions that are in sliding contact with one auxiliary lock gear operation member of each lock gear, and the pair of lock gears are in the meshing position. While the pair of auxiliary lock gear operating members press the outer walls of the corresponding recesses radially outward by their outer edges, the engagement teeth of the pair of auxiliary lock gears and the internal teeth of the internal gear are engaged with each other. When the pair of lock gears move from the meshing position to the mesh release position, the pair of auxiliary lock gear operating members press the inner walls of the corresponding recesses radially inwardly by the inner edges thereof, so that the pair of auxiliary lock gears The engagement between the locking teeth and the internal teeth of the internal gear is released .

  According to the present invention, the pair of lock gears slide in the radial direction between the meshing position where the pair of lock gears mesh with the internal gear by the rotation of the cam and the mesh release position, and the pair of auxiliary lock gears as the lock gear slides. Is configured to slide in the radial direction between the meshing position and the meshing release position, so that only a pair of auxiliary lock gears are added to the conventional configuration having only a pair of lock gears, without increasing the size of the reclining device. It is possible to provide a reclining device that can greatly improve the lock strength and can be applied to a belt-in seat where a large load may be applied to the seat back.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 and FIG. 2 show a reclining device R according to the present invention attached to both sides of a vehicle seat, for example, for holding a seat back tiltably with respect to a seat cushion.

  The reclining device R includes a circular recliner assembly 1 attached to a connecting portion between a seat cushion and a seat back. The recliner assembly 1 includes a seat cushion (see FIG. 3 to FIG. 5). A guide bracket 2 fixed to the guide bracket 2, an internal gear 3 fixed to the seat back (not shown) opposite the guide bracket 2, and interposed between the guide bracket 2 and the internal gear 3. A pair of lock gears 4 and a pair of auxiliary lock gears 5, and a cam 6 that slides the pair of lock gears 4 in the direction of separating and contacting are provided. The guide bracket 2 and the internal gear 3 are integrally assembled by the mounting ring 7 with the lock gear 4, the auxiliary lock gear 5, and the cam 6 accommodated therein. The cam 6 is connected to an operation lever (not shown). When the operation lever is operated, the cam 6 rotates and the lock gear 4 slides in the radial direction. The auxiliary lock gear 5 slides in the radial direction as the direction slides.

  The guide bracket 2 has a plate shape and is formed in a substantially circular shape. An operation lever insertion hole 2a into which a part of the operation lever is inserted and connected to the cam 6 is formed in the center portion thereof, and an inner end surface thereof (FIG. 3). A pair of guide members 8 in the front-rear direction protrudes inward in the width direction on the left end surface of the head, that is, the surface facing the internal gear 3. Each guide member 8 is shaped symmetrically with respect to the operation lever insertion hole 2a. Further, the opposed surfaces of the pair of front and rear guide members 8 formed on the upper and lower sides of the pair of guide members 8 extend in parallel, and a part of the lock gears 4 (meshing portions described later) is slidably contacted between the opposed surfaces. A pair of upper and lower first guide grooves 2b to be fitted is formed. Similarly, the opposing surfaces of the two guide members 8 separated in the vertical direction at the front part or the rear part of the reclining device R also extend in parallel, and a pair of front and rear that fit each auxiliary lock gear 5 in sliding contact between the opposing surfaces. The second guide groove 2c is formed, and the first guide groove 2b and the second guide groove 2c are orthogonal to each other. Further, a plurality of convex portions 2 d and a plurality of concave portions 2 e for engaging with the mounting ring 7 are formed at a predetermined interval on the outer edge of the guide bracket 2, and the outer diameter of the concave portion 2 e is the same as that of the internal gear 3. It is set substantially equal to the outer diameter (therefore, the outer edges of the recess 2e and the internal gear 3 are set substantially flush). A plurality of mounting pins (pin-shaped projecting portions) 2f (see FIG. 1) attached to a mounting bracket (described later) fixed to the seat cushion are arranged in the width direction at predetermined intervals around the operation lever insertion hole 2a. It protrudes outward. The guide member 8 and the mounting pin 2f are formed integrally with the guide bracket 2 by pressing a predetermined part of the guide bracket 2.

  The internal gear 3 is formed in a substantially circular shape, and a circular protruding portion 9 protrudes outward in the width direction on the outer end surface (the left end surface in FIG. 3). A through hole 3a facing the operation lever insertion hole 2a of the guide bracket 2 is formed in the portion, and a plurality of mounting pins (pins) attached to a mounting bracket (described later) fixed to the seat back are formed around the hole 3a. Shaped projection portion) 3c is projected outward in the width direction at a predetermined interval. Similarly to the mounting pin 2f, the mounting pin 3c is formed integrally with the internal gear 3 by pressing a predetermined portion of the internal gear 3. Further, the inside of the circular projecting portion 9 is a mounting recess 3b (see FIG. 2 (b)), and the inner diameter thereof is the outer peripheral surface of the above-described guide member 8 provided in a pair (up to four in total). The inner teeth 3d (see FIG. 5B) are formed on the entire inner circumference. Each guide member 8 is fitted in the mounting recess 3b so that the outer peripheral surface thereof is in sliding contact with the inner peripheral surface of the mounting recess 3b in a state where the guide bracket 2 and the internal gear 3 are combined.

  Each lock gear 4 includes a meshing portion 10 that is fitted in the first guide groove 2 b of the guide bracket 2 so as to be movable up and down, and a first shoulder portion 11 and a second shoulder portion 12 that are integrally formed on both sides of the meshing portion 10. A leg 13 extending toward the first shoulder 11 of the lock gear 4 located on the opposite side from the second shoulder 12, and a first auxiliary lock gear operation extending from the first shoulder 11 toward the one auxiliary lock gear 5. A member 14 and a second auxiliary lock gear operating member 15 extending from the second shoulder 12 toward the other auxiliary lock gear 5 are provided. The meshing part 10 has a locking tooth 4a that is formed at the front end edge thereof and meshes with the internal tooth 3d of the internal gear 3, and the locking tooth 4a is fitted in the mounting recess 3b. The relative rotation between the guide bracket 2 and the internal gear 3 is restricted by meshing with the internal teeth 3d. Further, a convex portion 13 a is formed on the inner edge of the distal end portion of the leg portion 13 to engage with a part of the cam 6 and slide the lock gear 4 inward in the radial direction.

  The length of the leg portion 13 is such that each lock gear 4 slidably accommodated in the internal space of the mounting recess 3 b of the internal gear 3 moves radially outward and is formed in the meshing portion 10. The meshing position where the tooth 4a meshes with the internal tooth 3d of the internal gear 3 and the inward movement of the engaging tooth 4a of the meshing portion 10 and the internal tooth 3d of the internal gear 3 are released by moving radially inward. It is set so that it can move between the mesh release positions. More specifically, the distance between the meshing position and the meshing release position is set to be slightly larger than the tooth height dimension of the locking tooth 4a, and the lock gear 4 moves radially outward from the operation lever insertion hole 2a. As a result, the locking teeth 4a of the meshing portion 10 mesh with the internal teeth 3d, while the locking gear 4 moves toward the operation lever insertion hole 2a, thereby releasing the meshing of the locking teeth 4a with the internal teeth 3d. .

  Further, each auxiliary lock gear 5 has a locking tooth 5 a formed at the front end edge thereof and meshing with the internal tooth 3 d of the internal gear 3, the first auxiliary lock gear operating member 14 of one lock gear 4, and the first lock gear 4 of the other lock gear 4. 2 Auxiliary lock gear operation member 15 is accommodated and has two recesses 5b that are in sliding contact with the first and second auxiliary lock gear operation members 14 and 15 as the cam 6 rotates. The first and second auxiliary lock gear operating members 14 and 15 of the lock gear 4 and the two recesses 5b of the auxiliary lock gear 5 are formed such that the auxiliary lock gear 5 is radially outward or slid by sliding radially outward or inward of the lock gear 4. The shape is set so as to slide inward.

  The cam 6 is formed in a substantially hexagonal shape, and the first convex portion 6 a that abuts the inner peripheral inclined surface 11 a of the first shoulder portion 11 of the lock gear 4 at three corner portions facing the one lock gear 4. A second convex portion 6b that contacts the convex portion 12a formed on the inner peripheral surface of the second shoulder portion 12, and a third convex portion 6c that contacts the convex portion 13a of the leg portion 13, Similarly, the first protrusion 6 a that contacts the inner peripheral inclined surface 11 a of the first shoulder portion 11 of the lock gear 4 and the inner peripheral surface of the second shoulder portion 12 also at the three corners facing the other lock gear 4. The 2nd convex part 6b contact | abutted with the convex part 12a formed in this, and the 3rd convex part 6c contact | abutted with the convex part 13a of the leg part 13 are formed.

  A long hole 6d is formed in the center of the cam 6. The cam 6 is connected to the operation lever through the long hole 6d, and two pins 16 are implanted on both sides of the long hole 6d. The other end of the spiral spring 17 whose one end is locked to one of the two pins 16 is locked to a notch 2g formed at the inner edge of the operation lever insertion hole 2a of the guide bracket 2, thereby camming. 6 urges the lock gear 4 radially outward.

  The mounting ring 7 has a circular flat surface portion 7a and a cylindrical side portion 7b extending perpendicularly from the outer edge portion of the circular flat surface portion 7a. The circular flat surface portion 7a has an outer diameter of the circular protruding portion 9 of the internal gear 3. A circular hole 7c having a slightly larger diameter is formed, while a plurality of mounting pieces 7d having a slightly narrower width than the concave portion 2e formed on the outer edge of the guide bracket 2 are formed in the cylindrical side portion 7b at the same interval as the concave portion 2e. It is formed with. In addition, the inner diameter of the cylindrical side portion 7b is set to be approximately equal (exactly slightly larger) to the diameters of the plurality of recesses 2e formed on the outer edge of the guide bracket 2 and the outer diameter of the internal gear 3. .

  When assembling the recliner assembly 1, the mounting ring 7 is connected from the internal gear 3 side to the internal gear 3 with the lock gear 4, auxiliary lock gear 5, cam 6, etc. interposed between the guide bracket 2 and the internal gear 3. And the guide bracket 2, each mounting piece 7 d of the mounting ring 7 is fitted into one of the recesses 2 e of the guide bracket 2, and the circular protruding portion 9 of the internal gear 3 is connected to the circular hole 7 c of the mounting ring 7. Inset. Then, the convex portion 7f formed at the bottom of the slit 7e between the adjacent mounting pieces 7d of the mounting ring 7 comes into contact with the inner surface of the convex portion 2d of the guide bracket 2, and in this state, the tip end of the mounting piece 7d is placed inside. The assembly of the recliner assembly 1 is completed by bending approximately 90 °.

  As shown in FIG. 4, the guide bracket 2 and the internal gear 3 are interposed between the circular flat surface portion 7a of the mounting ring 7 and the bent portion of the mounting piece 7d, and the outer peripheral surface of the internal gear 3 is The outer peripheral surface of the internal gear 3 that is in sliding contact with the inner peripheral surface of the cylindrical side portion 7 b of the mounting ring 7 and that is located outside the circular projecting portion 9 is in sliding contact with the inner end surface of the circular flat portion 7 a of the mounting ring 7. Therefore, the radial and width variations of the internal gear 3 are suppressed by the mounting ring 7. That is, the positioning of the internal gear 3 in the radial direction and the width direction is performed by the mounting ring 7. Since a plurality of (for example, six) protrusions 7g are formed at predetermined intervals on the inner end surface of the circular flat surface portion 7a of the mounting ring 7, the outer end surface of the internal gear 3 and the mounting ring 7 are The sliding contact with the inner end surface of the circular flat portion 7a is performed through the plurality of protrusions 7g, and the inner end surface of the inner ring 3 and the inner end surface of the circular flat portion 7a of the mounting ring 7 is located between the inner end surface. The minimum necessary clearance for smooth operation of the tooth gear 3 is ensured.

  As shown in FIG. 1, a mounting bracket 18 is fixed to the seat cushion, an operation lever insertion hole 18a is formed at the center of the mounting bracket 18, and a guide bracket 2 is formed around the operation lever insertion hole 18a. A plurality of mounting pin insertion holes 18b into which the mounting pins 2f are inserted are formed at predetermined intervals. Similarly, a mounting bracket 19 is fixed to the seat back, and a connecting shaft insertion hole 19a is formed at the center of the mounting bracket 19, and a mounting pin 3c of the internal gear 3 is provided around the connecting shaft insertion hole 19a. A plurality of mounting pin insertion holes 19b into which are inserted are formed at predetermined intervals.

  The assembled recliner assembly 1 has the mounting pin 2f of the guide bracket 2 inserted into the mounting pin insertion hole 18b of the mounting bracket 18 fixed to the seat cushion and is welded to the mounting bracket 18 and is fixed to the seat back. The recliner assembly 1 is held between the two mounting brackets 18 and 19 by inserting the mounting pin 3 c of the internal gear 3 into the mounting pin insertion hole 19 b of the mounting bracket 19 and welding it to the mounting bracket 19. The At this time, as shown in FIG. 2 (b), the inner surface of the mounting bracket 18 (the surface facing the reclining assembly 1) comes into contact with the outer end surface of the bent portion of the mounting piece 7 d of the mounting ring 7 and the guide bracket 2. By setting the shape of the mounting bracket 18 so that the bent portion is sandwiched between the mounting brackets 18, the bent portion of the mounting piece 7 d is prevented from opening when a load is applied to the reclining assembly 1.

  The two mounting brackets 18 and 19 are integrally formed with spiral spring locking pieces 18c and 19c bent outward, and one end of the spiral spring (not shown) is connected to the spiral spring. The seat back is always urged in the forward tilting direction by engaging with the engaging piece 18c and engaging the other end of the spiral spring with the spiral spring engaging piece 19c.

  One end of a connecting shaft (not shown) is inserted into the connecting shaft insertion hole 19a of the mounting bracket 19 fixed to the seat back and connected to the operation lever, and the other end of the connecting shaft is provided on the opposite side of the seat. The left and right reclining devices are operated in synchronism with the operation of the operation lever.

Hereinafter, the operation of the reclining device R according to the present invention having the above-described configuration will be described with reference to FIG.
As shown in FIG. 5A, in a normal seating state where the operation lever is not operated, the cam 6 is urged in the direction of arrow A by the elastic force of the spiral spring 17.

  In this state, the first convex portion 6a and the second convex portion 6b of the cam 6 are in contact with the inner peripheral inclined surface 11a and the convex portion 12a respectively formed on the first and second shoulder portions 11 and 12 of the lock gear 4. Then, the lock gear 4 is pressed radially outward to engage the locking teeth 4 a of the lock gear 4 and the internal teeth 3 d of the internal gear 3. When the lock gear 4 is in the meshing position, the first and second auxiliary lock gear operating members 14 and 15 of the lock gear 4 radially outwardly move the outer wall of the recess 5b formed in the corresponding auxiliary lock gear 5 by the outer edge thereof. The engaging teeth 5a and the internal teeth 3d of the internal gear 3 mesh with each other. Accordingly, the position of the internal gear 3 with respect to the guide bracket 2 or the inclination angle of the seat back with respect to the seat cushion is maintained at a predetermined position or a predetermined angle.

  When the operating lever is pulled up against the elastic force of the spiral spring 17 in this state, the cam 6 rotates in the opposite direction of the arrow A, and the first convex portion 6a of the cam 6 is in contact with the inner peripheral inclined surface 11a of the lock gear 4. The second convex portion 6 b of the cam 6 is fitted into a concave portion formed on the inner peripheral side of the second shoulder portion 12 of the lock gear 4 while being fitted into a concave portion formed between the convex portion 12 a. Furthermore, since the 3rd convex part 6c of the cam 6 contact | abuts and presses the convex part 13a of the leg part 13 of the lock gear 4, the meshing part 10 of the lock gear 4 is radially inward along the 1st guide groove 2b. The engagement between the locking teeth 4a and the internal teeth 3d of the internal gear 3 is released, and the lock gear 4 is engaged from the meshing position shown in FIG. 5 (a) to the meshing shown in FIG. 5 (b). Move to the release position. When the lock gear 4 moves from the meshing position to the mesh release position, the first and second auxiliary lock gear operating members 14 and 15 cause the inner wall of the recess 5b formed in the corresponding auxiliary lock gear 5 to radially inward by the inner edge thereof. By pressing, the meshing between the locking teeth 5a and the internal teeth 3d of the internal gear 3 is released. Accordingly, the tilt posture (tilt angle) of the seat back with respect to the seat cushion can be arbitrarily set.

  After the tilting posture of the seat back with respect to the seat cushion is set, when the hand is released from the operation lever, the cam 6 is rotated in the direction of arrow A by the elastic force of the spiral spring 17, and the lock gear 4 and the auxiliary lock gear 5 are moved radially outward. By sliding, the locking teeth 4a and 5a mesh with the internal teeth 3d of the internal gear 3, and the seat back is held in a newly set tilting posture.

  In the above embodiment, the guide bracket 2 is fixed to the seat cushion and the internal gear 3 is fixed to the seat back. However, the guide bracket 2 is fixed to the seat back and the internal gear 3 is fixed to the seat back. The structure fixed to a cushion is also possible.

  In the reclining device according to the present invention, since the pair of auxiliary lock gears are engaged with the internal gear in addition to the pair of lock gears, the lock strength can be greatly improved without increasing the size of the device. Application to sheets is possible.

It is a disassembled perspective view of the reclining apparatus concerning invention. (A) is a front view of the reclining device of FIG. 1, (b) is sectional drawing along line IIb-IIb in (a). It is a disassembled perspective view of the recliner assembly provided in the reclining apparatus of FIG. (A) is a front view of the recliner assembly of FIG. 3, (b) is a sectional view taken along line IVb-IVb in (a), and (c) is taken along line IVc-IVc in (a). FIG. FIG. 4 shows a meshing state of a lock gear and an auxiliary lock gear provided in the recliner assembly of FIG. 3 and an internal gear, wherein (a) is a front view at a meshing position, and (b) is a front view at a mesh release position. is there.

Explanation of symbols

1 Reclining assembly, 2 Guide bracket, 2a Operation lever insertion hole,
2b 1st guide groove, 2c 2nd guide groove, 2d convex part, 2e concave part,
2f mounting pin, 2g notch, 3 internal gear, 3a through hole,
3b mounting recess, 3c mounting pin, 3d internal teeth, 4 lock gear,
4a Locking tooth, 5 Auxiliary lock gear, 5a Locking tooth, 5b Recess, 6 Cam,
6a 1st convex part, 6b 2nd convex part, 6c 3rd convex part, 6d long hole,
7 mounting ring, 7a circular plane part, 7b cylindrical side part, 7c circular hole,
7d mounting piece, 7e slit, 7f convex part, 7g protrusion, 8 guide member,
9 circular projecting portion, 10 meshing portion, 11 first shoulder portion, 11a inner peripheral inclined surface,
12 second shoulder, 12a convex part, 13 leg part, 13a convex part,
14 first auxiliary lock gear operating member, 15 second auxiliary lock gear operating member,
16 pins, 17 spiral springs, 18, 19 mounting brackets,
18a operation lever insertion hole, 18b mounting pin insertion hole, 18c spiral spring locking piece,
19a connecting shaft insertion hole, 19b mounting pin insertion hole, 19c spiral spring locking piece,
R Reclining device.

Claims (3)

A guide bracket fixed to one of a seat cushion and a seat back that is tiltably attached to the seat cushion, an internal gear fixed to the other of the seat cushion and the seat back, the guide bracket, and an internal tooth A cam rotatably mounted between the gears, a pair of lock gears that slide in the radial direction in conjunction with the rotation of the cams, and a pair of auxiliary lock gears that slide in the radial direction in linkage with the lock gear; A meshing position where the pair of lock gears meshes with the locking teeth and the internal teeth of the internal gear by rotation of the cam; the locking teeth of the pair of lock gears and the internal teeth of the internal gear while sliding in the radial direction between the engagement release position where engagement is released between, each of the pair of lock gears has a pair of auxiliary lock gears operating member, the pair With the radial sliding between the engagement position and disengagement position of the lock gear, the pair of auxiliary lock gears by the pair of auxiliary lock gears operating member, meshing position of internal teeth meshing of the locking teeth and the internal gear And a reclining device that slides in a radial direction between the engagement teeth of the pair of auxiliary lock gears and the engagement release position where the engagement of the internal teeth of the internal gear is released. The reclining device according to claim 1, wherein a sliding direction of the pair of lock gears and a sliding direction of the pair of auxiliary lock gears are orthogonal to each other . Each of the pair of auxiliary lock gears has two recesses that are in sliding contact with one auxiliary lock gear operating member of each lock gear, and when the pair of lock gears are in the meshing position, the pair of auxiliary lock gear operating members By pressing the outer wall of the corresponding concave portion radially outward by the engagement, the engaging teeth of the pair of auxiliary lock gears mesh with the internal teeth of the internal gear, while the pair of lock gears are disengaged from the meshing position. When moved to the position, the pair of auxiliary lock gear operating members press the inner walls of the corresponding recesses radially inward by the inner edges thereof, and the engagement teeth of the pair of auxiliary lock gears and the internal teeth of the internal gear The reclining device according to claim 1, wherein the meshing with the device is released.

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