KR100896412B1 - Seat reclining device - Google Patents

Abstract

The present invention relates to a seat reclining apparatus, comprising: a holder, a gear wheel accommodated on one side of the holder, and a plurality of arms rotatably supported with respect to the axial hole of the holder and extending radially from the body portion. A slide space portion tapered at both ends of the outer circumference thereof with an actuating cam having a portion; And a rocker assembly having a locking member slidably received in a circumferential direction, wherein rolling motion on the inner circumferential surface of the holder of the gear wheel is prevented as the locking member is pressed outwardly in the circumferential direction by the elastic pressing means. And the arm portion is rotated when the operation cam is rotated. Pressing the member inward in the circumferential direction to release the pressure of the gear wheel by the locking member, and further rotation of the actuating cam causes the guide block to be pressed and rotated so that the gear wheel rolls on the inner circumferential surface of the holder. It features. According to this, the locking and unlocking conditions of the gear wheel can be set independently of the shape of the holder of the seat reclining apparatus and the gear wheel.

Dial recliner, locking condition, wedge

Description

Seat Reclining Device {SEAT RECLINING DEVICE}

TECHNICAL FIELD The present invention relates to a seat reclining apparatus, and more particularly, to a seat reclining apparatus with improved locking and unlocking structure of a gearwheel to a holder.

The seat reclining apparatus is mainly applied to a vehicle seat, and is a device for adjusting the rotation angle of the seatback with respect to the seat cushion, the rotation angle of the seat cushion itself, and the like.

Among these kinds of sheet reclining apparatus, US Patent No. 6,830,298 "ADJUSTMENT-LOCKING MECHANISM FOR AN AUTOMOBILE SEAT BACK" (published: December 14, 2004), US Patent No. 2003/0214165 "FITTING FOR A VEHICLE SEAT" (published) (2003.11.20) and the like, there has been disclosed a locking and unlocking structure between a holder and a gear wheel having internal teeth and external teeth having different teeth.

However, according to the above-mentioned prior art, the components in charge of the locking and unlocking functions in the seat reclining apparatus are bosses on the holder side provided therein and support rims on the gearwheel side provided outside. There is a problem in that the shape is restricted, that is, the design is restricted.

Therefore, in the conventional technology as described above, the shape of the components responsible for the locking and unlocking of the seat reclining apparatus and the operating force during its operation were inevitably changed due to the dimensions and processing errors of the holder and the gear wheel. . That is, the design of the locking and unlocking components of the seat reclining device can be carried out independently of the holder and the gearwheel, or the design force can be changed appropriately to change the operating force of the components responsible for locking and unlocking. Was extremely difficult.

The object of the present invention is that the shape of the components responsible for the locking and unlocking between the holder and the gearwheel in the seat reclining apparatus and the operating force during its operation are not largely dependent on the dimensions of the holder and the gearwheel, processing errors, etc. It is to provide a sheet reclining apparatus having an improved structure so that it can be designed independently.

In order to achieve the above object, the present invention provides a seat reclining apparatus comprising: a holder having a gear rim in which a tooth is formed on an inner circumferential surface thereof and a shaft hole formed in a center thereof; A gear wheel which is accommodated on one side of the holder and has teeth formed on the outer circumferential surface of the holder smaller than the inner circumferential surface of the holder; An operation cam that is received between the holder and the gearwheel and rotatably supported with respect to the shaft hole of the holder, and a plurality of arm portions extending radially from the body portion and spaced apart from each other by a predetermined angle in the circumferential direction. ; And an inner circumferential surface accommodated between the holder and the gear wheel and rotatably interviewed by the body portion of the operation cam, and an outer circumferential surface rotatably interviewed by the gear wheel, respectively, at both ends of the outer circumferential surface, the outer side of the circumferential direction is narrow. A guide block having a slide space portion formed to taper inwardly, a plurality of locking members slidably accommodated in each slide space portion in a circumferential direction, and elastic pressing means for pressing the plurality of locking members to the outside in the circumferential direction, respectively. And a rocker assembly configured to be pressed against the inner circumferential surface of the gear wheel in a radial direction by the plurality of locking members as the plurality of locking members are respectively pressed outward in the circumferential direction by the elastic pressing means. This allows the gearwheel to have low rolling motion on the inner circumferential surface of the holder. When the operation cam is rotated, any one of the plurality of arm portions presses any one of the plurality of locking members in the circumferential direction and inserts the corresponding gear space into the corresponding slide space. The pressure is released, and the guide block is rotated by the additional rotation of the operation cam to release the pressure of the gear wheel by the locking member by inserting the other one of the plurality of locking members into the slide space, Accordingly, the gear wheel provides a seat reclining apparatus, characterized in that the rolling motion on the inner peripheral surface of the holder.

Here, the locking member may be a wedge.

The elastic pressing means may be a plurality of springs accommodated in each slide space to press the locking member outward in the circumferential direction.

The present invention also provides a seat reclining apparatus comprising: a holder having a gear rim having a tooth formed on an inner circumferential surface thereof, and having a shaft hole formed in a center thereof; A gear wheel which is accommodated on one side of the holder and has teeth formed on the outer circumferential surface of the holder smaller than the inner circumferential surface of the holder; An actuating cam received between the holder and the gearwheel and rotatably supported relative to the axial hole of the holder, and an arm cam extending in one radial direction of the body portion; And an inner circumferential surface that is received between the holder and the gear wheel to enclose the body portion of the actuating cam, the inner circumferential surface rotatably interviewing the body portion of the actuating cam, and an outer circumferential surface rotatably interviewing the gear wheel. A guide block having a slide space portion formed at both ends of the outer circumferential surface adjacent to both sides of the portion in a circumferential direction, and having a tapered inner side in the circumferential direction and wider tapering on the outside, and a plurality of locking members slidably accommodated in each slide space portion in the circumferential direction And a rocker assembly having elastic pressing means for pressing the plurality of locking members inward in the circumferential direction, respectively, wherein the plurality of locking members are pressed inward in the circumferential direction by the elastic pressing means. The inner circumferential surface of the wheel is radially driven by the plurality of locking members. It is press-supported, whereby the gear wheel is prevented from rolling motion on the inner circumferential surface of the holder, and when the operation cam is rotated, the arm portion presses any one of the plurality of locking members outward in the circumferential direction corresponding slide By inserting into the space portion to release the pressure of the gear wheel by the locking member, by the additional rotation of the operating cam the guide block is rotated by pressing the other one of the plurality of locking members into the slide space Release of the pressure of the gear wheel by the locking member, thereby providing a seat reclining device characterized in that the gear wheel is rolling on the inner peripheral surface of the holder.

Here, the locking member may be a wedge.

The elastic pressing means may be a plurality of springs accommodated in each slide space to press the locking member in the circumferential direction.

According to the present invention as described above, the locking and unlocking between the holder and the gearwheel is made by a slide space portion formed in the guide block of the rocker assembly and a locking member accommodated in the slide space portion thereof, that is, the seat reclining The design of the components responsible for the locking and unlocking of the device can be done independently without being affected by the dimensions of the holder and gearwheel, machining errors and the like.

Therefore, since the operating force of the seat reclining apparatus is determined by the tapering degree, the shape of the slide space portion, and the shape of the locking member accommodated therein, rather than the general conditions of the holder and the gear wheel, the product performance is constantly maintained by design. It is easy to change the product performance without changing the overall shape.

As shown in FIGS. 1 and 2, the seat reclining apparatus 100 according to the first embodiment of the present invention includes a holder 110 having a gear 111 formed with a tooth T1 on an inner circumferential surface thereof, and a holder ( The gear wheel 140 accommodated in the operation cam 120 and the rocker assembly 130 accommodated in the receiving portion 112 of the 110, the gear wheel seating portion 115 formed around the receiving portion 112 of the holder 110. And a housing 150 for receiving the outer circumferential edges of the gear wheel 140 and the holder 110 to support relative rotation.

The holder 110 has a gear 111 protruding upward in the outer circumferential portion (a right direction in the drawing), and a tooth T1 is formed on the inner circumferential surface of the gear 111. The receiving portion 112 is provided inside the gear 111, and the operating cam 120 is formed at the center to form a shaft hole for providing a rotation center of the operating cam 120 and to be rotatable about the shaft hole. A boss 113 for supporting the protrusion is formed.

The holder 110 has a coupling protrusion 114 protruding in a downward direction (left direction in the drawing) inside, and may be coupled to a seat cushion frame (not shown) through the holder 110.

Operation cam 120 is rotatably coupled to the boss 113 through the body portion 121 of the center. In addition, the operation cam 120 is exposed to the outside through the opening 142 formed in the center of the gear wheel 140, the upper surface of the body portion 121, the reclining knob through the input groove 132 formed on the upper surface (reclining knob, not shown). Accordingly, the seat occupant of the seat may adjust the reclining angle of the seat back by rotating the reclining knob connected to the operation cam 120.

In addition, the operation cam 120 has a plurality of arm portions 122 extending radially from the body portion 121. The plurality of arm portions 122 are symmetrically spaced apart from each other by a predetermined angle in the circumferential direction.

Each arm portion 122 has a cam surface 123 in which one side surface facing each other extends in the radial direction. Each cam surface 123 opposes each other in the circumferential direction.

The rocker assembly 130 is a component that is received and supported between the holder 110 and the gearwheel 140 together with the operation cam 120 as described above. The guide block 131, the wedges 132, and the spring 133 are provided. It includes.

The guide block 131 is located between the actuating cam 120 and the gearwheel 140, as shown in FIGS. 1 and 3. Specifically, the inner circumferential surface of the guide block 131 is rotatably interviewed with the body 121 of the operation cam 120, and the outer circumferential surface is slidably interviewed with the inner circumferential surface 143 of the gear wheel 140. .

According to the shape of the guide block 131, when the gear wheel 140 makes a rolling motion while maintaining the engagement in the holder 110, the operation cam 120 and the rocker assembly 130 are the gear wheel 140. ) And rotate in the holder 110.

Meanwhile, slide spaces S (see FIG. 5) are formed at both ends of the guide block 131 in contact with the inner circumferential surface 143 of the gear wheel 140, and the wedges 132 and the slide spaces S are respectively formed. Spring 133 is received.

The spring 133 is an elastic pressing means for urging the wedge 132 in the circumferential direction (clockwise in FIG. 5), between the wedge 132 and the guide block 131 when viewed in the circumferential direction. Located. In addition to the spring 133, such elastic pressing means may be replaced with an elastic member having a material such as rubber. Alternatively, as not accommodated in the slide space S, both ends may be replaced by a ring-shaped spring exerting a pressing force in a tangential direction.

On the other hand, as shown in Figure 5, the guide block 131 is formed so that the slide space (S) is narrow in the outer circumferential direction (that is, clockwise) and tapered inward. Accordingly, the wedge 132 is pushed outward in the circumferential direction by the spring 133, but in close contact with the inner circumferential surface 143 of the guide block 131 and the gear wheel 140 to apply a force in the radial direction. . As a result, the gear wheel 140 pressed by the wedge 132 is in a locked state in which rotation in the clockwise direction is prevented.

Similarly, in Fig. 3, in the receiving space (S) on the opposite side, the gear wheel 140 is in a locked state where rotation in the counterclockwise direction is prevented by the wedge 132.

As a result, in the engaged state as shown in FIG. 3, the gear wheel 140 is locked to the holder 110 by the wedges 132 on both sides as described above, and thus cannot perform rolling motion.

On the other hand, as shown in Figure 4, when the operation cam 120 rotates in the counterclockwise direction by pressing the one wedge 132 into the slide space (S) by the gears by the wedge 132 The pressure of the wheel 140 is released.

At this time, when the operation cam 120 is further rotated counterclockwise in the state that the pressure of the gear wheel 140 by the one side wedge 132 is released, as shown in Figure 5, the spring 133 is compressed to the right When the guide block 131 is pressed or the spring 133 is compressed, the cam surface 123 of the operation cam 120 directly touches the guide block 131 to press the guide block 131 to the right.

As a result, the guide block 131 rotates to the right side, and the wedge 132 on the right side of FIG. 4 is relatively inserted into the corresponding slide space S. FIG.

In this process, the pressure of the gear wheel 140 is released by the wedge 132 on the right side, whereby the gear wheel 140 is in the holder 110 together with the rotating operation cam 120 and the rocker assembly 130. Will make a cloud movement counterclockwise.

On the other hand, the wedge 132 having the configuration and function as described above as a locking member for the gear wheel 140, such a locking member may be used in addition to the above-described wedge 132 ball or roller (roller) It may be.

As described above, when the guide block 131 is tapered to form the slide space S, it is easy to set or change the taper angle. Accordingly, unlike the case of the related art, the operating force for operating the reclining knob may be changed according to design conditions.

As shown in FIGS. 1 to 3, the gear wheel 140 has a tooth shape T2 engaged with the tooth shape T1 of the holder 110 around the outer circumference thereof to form a gear wheel seat of the holder 110. Is accommodated in 115. The number of gear teeth of the gear wheel 140 is smaller than the number of gear teeth of the holder 110, so that the relative rolling motion is coupled with the gear wheel 140 engaged with the inner circumferential surface of the gear 111 of the holder 110. do.

A plurality of coupling protrusions 141 protrude integrally to the opposite side of the direction in which the gear wheel 140 engages with the holder 110 of the gear wheel 140, that is, in FIG. 1. Coupling protrusion 141 is coupled to the seat back frame (not shown) to engage.

The holder 110 and the gear wheel 140 accommodate the operation cam 120 and the rocker assembly 130 so as to be operable therein, and are coupled to each other by an outer housing 150. 1 and 2, the gear wheel 140 is rotatably supported on the gear wheel seat 115 of the holder 110 by the housing 150.

Looking at the operation of the seat reclining apparatus 100 having the above configuration as follows.

Referring to FIG. 3, as described above, in a state in which external rotational force is not applied through the operation cam 120, the plurality of wedges 132 are maintained in the circumferential direction by the spring 133, respectively. do. Accordingly, the gear wheel 140 is prevented from rotating in the clockwise or counterclockwise direction while being engaged with the gear 111 in the holder 110, that is, in a locked state. do.

When the rotational force is applied to the actuating cam 120 in such a locked state, as shown in FIGS. 4 and 5, the wedge 132 of the left side contacting the cam surface 123 is rotated according to the rotation of the actuating cam 120. They are pushed together to rotate counterclockwise, so that the guide block 131 also rotates counterclockwise.

The wedge 132 on the right side is not pressurized by the cam surface 123, but is ineffective against the counterclockwise rotation of the guide block 131 because it originally performed only the clockwise rotation of the guide block 131. . That is, since the tapered shapes of the slide spaces S on both sides are symmetrical with each other, only the rotation in one direction opposite to each other can be locked, and the locking function cannot be performed for the rotation in the other direction.

Therefore, in FIG. 4, the wedge 132 on the right side is inserted and moved into the slide space portion S as the guide block 131 rotates in the counterclockwise direction, thereby naturally unlocking the gear wheel 140. ) Rides on the gear 111 of the holder 110 to perform a cloud movement. At this time, the rolling contact point (ie, the gear engagement point) between the gear wheel 140 and the gear 111 moves in the counterclockwise direction.

FIG. 5 is a partially enlarged view showing a state in which the cam surface 123 is pressed (solid line) from the time when the cam surface 123 releases the pressure of the wedge 132 (dashed line) according to the counterclockwise rotation of the operation cam 120. When the cam surface 123 is rotated to press the wedge 132, the slide space S is positioned outside the guide block 131 and the guide block 131 located radially inward from the pressurized wedge 132 due to the tapering. The clearance between the inner circumferential surface 143 of the gear wheel 140 can be made, the rolling motion of the gear wheel 140 on the gear (111 of Figure 4) can be made.

In the seat reclining apparatus 200 according to the second embodiment of the present invention, as shown in FIGS. 6 and 7, a holder 210 having a gear 211 having teeth T1 ′ formed on an inner circumferential surface thereof, and a holder 210. The gear wheel accommodated in the operation cam 220 and the rocker assembly 230 accommodated in the receiving portion 212 of the 210, the gear wheel seating portion 215 formed around the receiving portion 212 of the holder 210 ( 240, and a housing 250 for accommodating the outer circumference of the gear wheel 240 and the holder 210 to support relative rotation.

In the present embodiment, the rest of the components except for the operation cam 220 and the rocker assembly 230 are the same as those of the first embodiment described above, and thus description thereof will be omitted.

The actuating cam 220 has a single arm portion 222 extending in one radial direction from the body portion 221.

The arm part 122 forms the cam surface 223 opposite to each other in the circumferential direction.

The rocker assembly 230 is a component that is received and supported between the holder 210 and the gearwheel 240 together with the actuating cam 220 and has a shape surrounding the body 221 of the actuating cam 220. Block 231 and further includes wedges 232 and springs 233.

The guide block 231 is located between the operation cam 220 and the gearwheel 240, as shown in FIG. Specifically, the inner circumferential surface of the guide block 231 is slidably interviewed by the body portion 221 of the operation cam 220, and the outer circumferential surface is slidably interviewed by the inner circumferential surface 243 of the gear wheel 240.

Slide space portions S '(refer to FIG. 9) are formed at both ends of the guide block 231 in contact with the inner circumferential surface 243 of the gear wheel 240 and adjacent to both sides of the arm portion 222 of the operation cam 220. The wedge 232 and the spring 233 are accommodated in the slide space S '.

The spring 233 is an elastic pressing means for pressing the wedge 232 in the circumferential direction (arm direction 222 in Fig. 7, clockwise in Fig. 9), as described in the first embodiment The elastic member having a material such as rubber or the like may not be accommodated in the slide space S, and both ends may be replaced by a ring-shaped spring exerting a pressing force in a tangential direction.

As shown in FIG. 9, the guide block 231 is formed such that the slide space S ′ is tapered in the circumferential inner side (ie, clockwise) and narrow in the outer side. Accordingly, the wedge 232 is pushed inward in the circumferential direction by the spring 233 in close contact with the inner circumferential surface 243 of the guide block 231 and the gear wheel 240 to apply a force in the radial direction. . As a result, the gearwheel 240 pushed by the wedge 232 is prevented from clockwise rotation relative to the wedge 232, and consequently the rolling motion in the counterclockwise direction with respect to the holder 210 is blocked. Locked state.

Similarly, in FIG. 7, in the receiving space S 'on the opposite side (left), the gear wheel 240 is locked by the wedge 232 in the clockwise rolling motion with respect to the holder 210. .

As a result, in the engaged state as shown in FIG. 7, the gear wheel 240 is locked to the holder 210 by the wedges 232 on both sides as described above and cannot rotate.

On the other hand, as shown in FIG. 8, when the operation cam 220 rotates in the counterclockwise direction, the arm part 222 presses the wedge 232 on the right side and inserts it into the slide space S '. The pressure of the gear wheel 240 by the wedge 232 is released.

At this time, when the operation cam 220 is further rotated counterclockwise in the state that the pressure of the gear wheel 240 by the right wedge 232 is released, as shown in Figure 9, the spring 233 is compressed and When the guide block 231 is pressed to the right or the spring 233 is compressed, the cam surface 223 of the operation cam 220 directly touches the guide block 231 to press the guide block 231 to the right.

As a result, the guide block 231 rotates to the right, that is, counterclockwise, and the wedge 232 on the left side of FIG. 8 is relatively inserted into the corresponding slide space S '.

In this process, the pressurization of the gear wheel 240 by the wedge 232 on the left side is released, whereby the gear wheel 240 is in the holder 210 together with the rotating operation cam 220 and the rocker assembly 230. Will make a cloud movement counterclockwise.

On the other hand, the wedge 232 having the configuration and function as described above is a locking member for the gear wheel 240, it can be replaced by a ball (ball) or roller (roller) as in the first embodiment.

As described above, the seat reclining apparatus 200 according to the second embodiment of the present invention also sets or changes the taper angle when the guide block 231 is tapered to form the slide space S '. Easy to design Accordingly, unlike the case of the related art, the operating force for operating the reclining knob may be changed according to design conditions.

The embodiments of the present invention have been described above by way of example only, and the scope of the present invention should not be understood as being limited to the above embodiments, and the scope of the present invention is to be described later. It is determined by the claims and their equivalents.

1 is an exploded perspective view of a seat reclining apparatus according to a first embodiment of the present invention;

FIG. 2 is a cross-sectional view (sectional view along the AA line of FIG. 3) showing the combined state of the seat reclining apparatus of FIG. 1, FIG.

3 and 4 are plan views showing an operating state of the seat reclining apparatus of FIG.

5 is an enlarged plan view of a region B of FIG. 4;

6 is an exploded perspective view of a seat reclining apparatus according to a second embodiment of the present invention;

7 and 8 are a plan view showing the operating state of the seat reclining apparatus of FIG.

FIG. 9 is an enlarged plan view of region C of FIG. 8.

     <Explanation of symbols for the main parts of the drawings>

100: seat reclining apparatus 110: holder

111: gear rim 112: receiving portion

113: boss 114, 141: engaging projection

115: gear wheel seating portion 120: operating cam

121: body portion 122: arm portion

123: cam surface 124: input groove

130: rocker assembly 131: guide block

132: wedge 133: spring

140: gearwheel 142: opening

150: housing

Claims (6)

A sheet reclining apparatus, A gear rim 111 having a tooth shape T1 formed on an inner circumferential surface thereof, and a boss 113 formed in the center thereof, has a gear wheel seating portion 115 and a receiving portion inward of the gear rim 111. A holder 110 in which 112 is sequentially formed; The gear wheel 140 accommodated in the gear wheel seating portion 115 of the holder 110, the tooth (T2) is formed on the outer peripheral surface formed smaller than the inner peripheral surface of the gear rim 111 is meshed with the gear rim 111. and; A circular body portion 121 interposed between the holder 110 and the gear wheel 140 and rotatably supported with respect to the boss 113 of the holder 110, and a radius from the body portion 121. An actuating cam 120 extending in a direction and having a plurality of arm portions 122 spaced apart from each other in a circumferential direction by a predetermined angle; And Interposed between the holder 110 and the gear wheel 140, both ends of the outer circumferential surface having an inner circumferential surface and the outer circumferential surface to interview the gear wheel 140 to the body portion 121 of the operation cam 120 A guide block 131 having a symmetrical slide space portion S formed so as to taper the outer circumference in a circumferential direction and a wider tapered inside thereof, and a plurality of symmetrically housed slides circumferentially in each slide space portion S; Rocker assembly 130 having a locking member 132 and the elastic pressing means 133 for pressing the plurality of locking members 132 to the outside in the circumferential direction, respectively, When the operation cam 120 is stopped, the plurality of locking members 132 are respectively pressed outwardly in the circumferential direction by the elastic pressing means 133, so that the gear wheel 140 is the plurality of locking members. 132 is pressed against the radial direction, whereby the gear wheel 140 is prevented from rolling motion on the inner peripheral surface of the gear 111 of the holder 110, When the operation cam 120 rotates, any one of the plurality of arm portions 122 presses any one of the plurality of locking members 132 inward in the circumferential direction to the corresponding slide space S. The pressure of the gear wheel 140 is released by the locking member 132 in the radial direction by pushing, and the guide block 131 is rotated by the operation cam 120 to rotate the plurality of locking members. The other one of the 132 is accommodated in the corresponding slide space (S) to release the pressure in the radial direction of the gear wheel 140 by the locking member 132, whereby the gear wheel 140 Seat reclining device, characterized in that the rolling motion on the inner peripheral surface of the gear 111 of the holder (110). The method of claim 1, The locking member is a seat reclining device, characterized in that the wedge (wedge). The method according to claim 1 or 2, And said elastic pressing means is a plurality of springs accommodated in each slide space to press the locking member outward in the circumferential direction. A sheet reclining apparatus, A gear rim 211 having teeth T1 ′ formed on an inner circumferential surface thereof, a boss 213 is formed in the center thereof, and a gear wheel seat 215 is received inside the gear rim 211. A holder 210 in which the parts 212 are sequentially formed; The gear wheel 240 accommodated in the gear wheel seating portion 215 of the holder 210 and the teeth (T2 ') to be engaged with the gear rim 211 is formed on the outer circumferential surface formed smaller than the inner circumferential surface of the gear rim 211. )and; A circular body portion 221 interposed between the holder 210 and the gear wheel 240 and rotatably supported with respect to the boss 213 of the holder 210 and one side of the body portion 221. An operation cam 220 having an arm portion 222 extending in a radial direction; And An inner circumferential surface interposed between the holder 210 and the gear wheel 240 so as to surround the body 221 of the operation cam 220, and in contact with the body 221 of the operation cam 220. The inner circumferential side of the outer peripheral surface adjacent to both sides of the circumferential direction of the arm portion 222 of the operation cam 220 having an outer circumferential surface in contact with the gear wheel 240 is formed so as to narrow the inner side in the circumferential direction and wider the outer side A guide block 231 in which the slide space portion S 'is symmetrically formed, a plurality of locking members 232 symmetrically accommodated in each slide space portion S' in a circumferential direction, and the plurality of locking members ( And a rocker assembly 230 having elastic pressing means 233 for pressing 232 each inward in the circumferential direction, When the operation cam 220 is stopped, the plurality of locking members 232 are pressed inwardly in the circumferential direction by the elastic pressing means 233, respectively, so that the gear wheel 240 has the plurality of locking members. 232 is pressed against the radial direction, whereby the gear wheel 240 is prevented from rolling motion on the inner peripheral surface of the gear 211 of the holder 210, When the operation cam 220 rotates, the arm part 222 pushes any one of the plurality of locking members 232 outward in the circumferential direction and pushes it into the corresponding slide space S '. Of the plurality of locking members 232 by releasing the pressure in the radial direction of the gear wheel 240 by the locking member 232, and by rotating the guide block 231 by the operation cam 220. The other one is accommodated in the corresponding slide space (S ') to release the pressure in the radial direction of the gear wheel 240 by the locking member 232, whereby the gear wheel 240 is the holder ( Seat reclining device characterized in that the rolling motion on the inner peripheral surface of the gear (211) of (210). The method of claim 4, wherein The locking member is a seat reclining device, characterized in that the wedge (wedge). The method according to claim 4 or 5, And said elastic pressing means is a plurality of springs accommodated in each slide space to press the locking member inward in the circumferential direction.

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