KR102402991B1 - Reclining apparatus for seat of vehicle - Google Patents

Abstract

An apparatus for reclining a vehicle seat according to the present invention includes an upper bracket connected to a seatback frame, a lower bracket connected to a seat cushion frame, and a connection between the upper bracket and the lower bracket to adjust the angle of the seatback frame An apparatus for reclining a vehicle seat including a recliner, wherein the recliner includes a disk-shaped body portion having a plurality of guide protrusions on one side thereof, and a cylindrical rim portion formed to protrude from an edge of one side of the disk-shaped body portion plate holder; a sector tooth which is rotatably inserted about a rotation axis into the receiving space formed by the disk-shaped body part and the rim part, and an internal gear is formed on an inner circumferential surface; a plurality of pole teeth disposed between the disk-shaped body part and the sector teeth to guide movement by the plurality of guide protrusions, and each having an external gear meshing with the internal gear; including, the rim part It is characterized in that it is provided with a bending part which is bent so as to contact the outer surface of the sector tooth and is integrally formed with the rim part.

Description

Reclining apparatus for vehicle seat {RECLINING APPARATUS FOR SEAT OF VEHICLE}

The present invention relates to a reclining device for a vehicle seat, and more particularly, by configuring the rim portion of the plate holder to be directly connected to the connection portion of the seat cushion frame or the seatback frame, the width and weight of the assembly including the recliner and the connection portion It relates to a reclining device for a vehicle seat that can significantly reduce the

In general, a seat, which is a driver's seat, a passenger seat, and a passenger seat seat installed in the front and rear of the interior of the vehicle, is equipped with various convenience devices for the comfort of the occupants.

As the convenience device, a sliding function that can be adjusted by pushing and pulling the seat back and forth according to the body type of the passenger as well as a reclining function for adjusting the inclination of the backrest (seatback) of the seat are provided.

In particular, the reclining function is implemented through the recliner so that the angle of the seatback can be adjusted with respect to the seat cushion.

The recliner is configured to be mutually switchable from the locked state in which the angle is fixed to the seat cushion side to the rotatable unlocked state.

In relation to this recliner, Korean Patent Application Laid-Open No. 10-2009-0100311, an example of a reclining device for a conventional vehicle seat including a recliner is shown.

As shown in Figure 1, the conventional recliner of the vehicle seat, the plate holder connected to the seat cushion frame through the lower bracket, is connected to the seatback frame through the upper bracket, the internal gear on the inner peripheral surface along the circumferential direction a plurality of pole teeth having formed sector teeth, an external gear which is moved along a guide protrusion formed on the inner surface of the plate holder and meshes with the internal gear, and the sector teeth are separated from the plate holder and a guide ring for rotatably supporting the sector tooth.

However, the recliner of the conventional vehicle seat as shown is firmly fixed to the outer circumferential surface of the plate holder, and using a guide ring extending to cover a portion of the outer surface of the sector tooth, the sector tooth and the inside Since it is configured to prevent separation of parts, it has a structure in which the lower bracket cannot be coupled to the outer circumferential surface of the plate holder.

Therefore, in the state in which the lower bracket is in contact with the outer surface of the plate holder, they are inevitably fixed firmly, and a means for preventing relative rotation with respect to the lower bracket (for example, anti-rotation protrusion, etc.) is provided on the outer surface of the plate holder. It must be provided, and the lower bracket must be provided with a structure having a complex shape corresponding to the rotation preventing means.

As described above, in the structure in which the outer surface of the plate holder and the lower bracket are fixed to each other, when an instantaneous strong load is generated on the lower bracket, such as a rear collision of a vehicle, the stress is concentrated in the rotation preventing means and the lower bracket Buckling due to deformation easily occurs, and there is a problem that the possibility of causing injury to the occupant is considerably high.

In addition, since the lower bracket is fixed to the outer surface of the plate holder, there is a problem that the width and total increase in the rotation axis direction of the assembly including the lower bracket and the recliner have to be increased to a certain level or more.

Korean Patent Publication No. 10-2009-0100311

The present invention has been devised to solve the above problems, and a means for preventing the separation of internal components including sector teeth is integrally formed with the rim portion of the plate holder, which corresponds to the guide ring in the prior art. By omitting a separate configuration and attaching a bracket for connection to the seat cushion frame or the seat back frame to the rim of the plate holder, the strength of the connection between the recliner and the bracket can be increased to significantly increase the safety of the occupant, and recline An object of the present invention is to provide an apparatus for reclining a vehicle seat that can significantly reduce the width and weight of an assembly including a liner and a bracket in the direction of the rotation axis compared to the prior art.

In order to solve the above problems, an apparatus for reclining a vehicle seat according to the present invention includes an upper bracket connected to a seat back frame, a lower bracket connected to a seat cushion frame, and the upper bracket connected between the lower bracket, A vehicle seat including a recliner for adjusting the angle of a seatback frame, wherein the recliner includes a disc-shaped body part having a plurality of guide protrusions on one side thereof, and protruding from an edge of one side of the disc-shaped body part a plate holder comprising a cylindrical rim; a sector tooth which is rotatably inserted about a rotation axis into the receiving space formed by the disk-shaped body part and the rim part, and an internal gear is formed on an inner circumferential surface; a plurality of pole teeth disposed between the disk-shaped body part and the sector teeth to guide movement by the plurality of guide protrusions, and each having an external gear meshing with the internal gear; including, the rim part It is characterized in that it is provided with a bending part which is bent so as to contact the outer surface of the sector tooth and is integrally formed with the rim part.

In addition, a separate separation preventing means for preventing the sector tooth from being separated from the accommodation space is omitted.

In addition, a cutting portion having a thinner thickness than the rim portion is provided between the rim portion and the bending portion.

In addition, the outer peripheral surface of the rim portion is directly fixed to either the upper bracket or the lower bracket.

In addition, any one of the upper bracket and the lower bracket is fixed to the rim and includes a ring-shaped holder connection part, and the outer peripheral surface of the rim part is inserted and welded to the inner peripheral surface of the holder connection part.

In addition, the holder connecting portion includes a burring portion extending in the direction of the rotation axis, and an inner circumferential surface of the burring portion is welded to an outer circumferential surface of the rim portion.

In addition, a center boss protruding in the direction of the rotation axis is formed on the outer surface of the sector tooth, and the other one of the upper bracket and the lower bracket includes a ring-shaped sector tooth connection part into which the center boss is inserted. .

In addition, an outer circumferential surface of the center boss is welded to an inner circumferential surface of the sector tooth connection part.

In addition, an anti-rotation protrusion protruding in a direction perpendicular to the rotation axis is provided on an outer peripheral surface of the center boss, and a step portion corresponding to the anti-rotation protrusion is formed in the sector tooth connecting portion.

The device for reclining the seat for a vehicle according to the present invention is such that the means for preventing the separation of the internal components including the sector teeth is integrally formed with the rim portion of the plate holder, thereby omitting a separate configuration corresponding to the guide ring in the prior art and a bracket for connection to the seat cushion frame or the seatback frame is attached to the rim of the plate holder, so that the connection strength between the recliner and the bracket can be increased to significantly increase the safety of the occupant, and the recliner and the bracket are included It has the effect of significantly reducing the width and weight of the assembly in the direction of the rotation axis compared to the prior art.

1 is a perspective view of an assembly including a recliner, a lower bracket and an upper bracket according to the prior art.
Figure 2 is an exploded perspective view of the recliner according to the present invention.
3 is an exploded perspective view of a reclining device including a recliner, a lower bracket and an upper bracket according to the present invention.
Figure 4 is a front view of the reclining device shown in Figure 3 is assembled.
5 is a cross-sectional view taken in the direction A-A' of the reclining device shown in FIG.
FIG. 6 is a partially enlarged view of FIG. 5 .

Hereinafter, a reclining device for a vehicle seat according to the present invention will be described in detail with reference to the accompanying drawings.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. This is not intended to limit the present invention to specific embodiments, and should be construed to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

In describing the present invention, terms such as first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The above terms are only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component.

The term and/or may include a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but other components may exist in between. can be understood On the other hand, when an element is referred to as being “directly connected” or “directly connected” to another element, it may be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression may include the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and one or more other features It may be understood that the existence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary may be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, it is interpreted in an ideal or excessively formal meaning. it may not be

In addition, the following embodiments are provided to more completely explain to those with average knowledge in the art, and the shapes and sizes of elements in the drawings may be exaggerated for more clear explanation.

2 is an exploded perspective view of the recliner 100 according to the present invention, an exploded perspective view of the reclining device including the recliner 100, the lower bracket 200 and the upper bracket 300 according to the present invention.

2 and 3 , the reclining device for a vehicle seat according to the present invention includes an upper bracket 300 connected to a seat back frame (not shown), and a lower bracket 200 connected to a seat cushion frame (not shown). ) and a recliner 100 connected between the upper bracket 300 and the lower bracket 200 to adjust the angle of the seatback frame.

First, the recliner 100 includes a plate holder 110 , a sector tooth 120 , an operation cam 140 , a plurality of pole teeth 130 , and a cam spring 150 as shown in FIG. 2 , is composed

The plate holder 110 is a portion connected to either the seat cushion frame or the seatback frame through any one of the upper bracket 300 or the lower bracket 200, and a first through hole 112 is formed in the center. It includes a disk-shaped body portion 111 having a plurality of guide protrusions 113 on one side thereof, and a cylindrical rim portion 115 protruding from one side edge of the disk-shaped body portion 111 .

An accommodating space in which an operation cam 140 , a plurality of pole teeth 130 , and a cam spring 150 to be described later are accommodated is formed by the inner surface of the disk-shaped body part 111 and the cylindrical rim part 115 . do.

The plurality of guide protrusions 113 are radially formed on the inner surface of the disk-shaped body part 111 in a protruding state spaced apart from each other at a predetermined distance, and radial movement of the plurality of pole teeth 130 to be described later. serves as a guide to

FIG. 2 illustrates a configuration in which a total of four guide protrusions 113 are formed on the inner surface of the disk-shaped body part 111 to provide a total of four pole teeth 130 by way of example.

Meanwhile, a stopper protrusion 114 to which a first end 152 of a cam spring 150 to be described later is fixed protrudes from one of the guide protrusions 113 .

The sector tooth 120 is a part connected to the other one of the seat cushion frame and the seat back frame through the other one of the upper bracket 300 and the lower bracket 200, and the disc-shaped body part 111 and the It is rotatably inserted in the receiving space formed by the rim part 115 about the rotation axis (X-X'), which is the central axis of the disk-shaped body part 111 , and is rotatably inserted on the inner peripheral surface of the pole tooth 130 to be described later. The internal gear 123 to which the gear 131 meshes is continuously formed along the circumferential direction.

A second through hole 122 concentric with the first through hole 112 of the plate holder 110 is formed in the center of the sector tooth 120 , and the first through hole 112 and the second through hole 112 are formed. An operation shaft (not shown) extends through the hole 122 .

The operation cam 140 receives rotational force from the operation shaft and rotates while maintaining the locking state between the plate holder 110 and the sector tooth 120 by moving the pole tooth 130 to be described later in the vertical direction or unlocking it. As a configuration that serves to change the state, it is disposed between the plate holder 110 and the sector tooth 120, and in the center is a shaft hole 141 through which the operation shaft is inserted and rotated integrally with the operation shaft. this is formed

The shaft hole 141 is configured in a polygonal shape to correspond to the cross-sectional shape of the operation shaft, and FIG. 2 shows an operating cam 140 having a rectangular shaft hole 141 by way of example.

In the center of the actuating cam 140, a spring boss 143 in which a cam spring 150 to be described later is installed between the sector tooth 120 and the actuating cam 140 is formed protruding around the shaft hole 141, the spring A spring protrusion 144 to which the second end 153 of the cam spring 150 is caught is formed on the outer peripheral surface of the boss 143 .

In addition, a plurality of ring-shaped release protrusions 142 are formed on the outer circumferential surface of the actuating cam 140 to protrude outward in the radial direction. The release protrusion 142 is a configuration corresponding to the engaging protrusion 132 of the pole tooth 130 to be described later, and when the actuating cam 140 rotates, the release protrusion 142 engages the engaging protrusion 132 while the pole tooth is engaged. While moving 130 inward in the radial direction, the lock between the plate holder 110 and the sector tooth 120 is released to realize an unlocked state therebetween.

The plurality of pole teeth 130 are respectively inserted between the plurality of guide protrusions 113 and meshed with the internal gear 123 of the sector tooth 120 while reciprocating in the radial direction by the rotation of the operation cam 140 . It is a configuration for performing the locking and unlocking action of the recliner 100 or separated.

That is, the plurality of pole teeth 130 are disposed between the disk-shaped body portion 111 and the sector tooth 120 so that movement is guided by the plurality of guide protrusions 113, respectively, and at the radially outer end, An external gear 131 meshing with the internal gear 123 is provided, and an engaging protrusion 132 on which the release protrusion 142 of the actuating cam 140 engages is provided at an inner end of the radial direction.

The cam spring 150 is a configuration for providing a restoring force to the actuating cam 140, but is not limited thereto, but includes a ring portion 151 formed in a spiral shape as shown in FIG. 2 and an outer side bent toward the outside. It may be configured to include a first end 152 of the, and an inner second end 153 bent toward the inside.

As described above, the first end 152 of the cam spring 150 is caught by the stopper protrusion 114 of the plate holder 110 , and the second end 153 of the cam spring 150 is the actuating cam 140 . ) is configured to be caught by the spring protrusion 144 of the actuating cam 140 to accumulate elastic force when the actuating cam 140 is rotated and wound or unwound to provide a restoring force for reversely rotating the actuating cam 140 when the reclining operation is released. do.

On the other hand, the lower bracket 200 is a configuration for connecting the recliner 100 to the seat cushion frame, the cushion frame connecting portion 210 is formed at the lower end, and the holder connecting portion 220 is provided at the upper end.

The upper bracket 300 is configured to connect the recliner 100 to the seatback frame, and the back frame connection part 310 is formed at the upper end, and the sector tooth connection part 320 is provided at the lower end.

Either one of the plate holder 110 or the sector tooth 120 of the recliner 100 is attached to the lower bracket 200 by welding or the like, and the plate holder of the recliner 100 is attached to the upper bracket 300 by welding. 110) or the other one of the sector teeth 120 is attached by welding or the like.

3 to 6 by way of example, the plate holder 110 of the recliner 100 is fixed to the lower bracket 200 , and the sector tooth 120 of the recliner 100 is fixed to the upper bracket 300 . The configuration is shown.

The present invention is not limited thereto, but hereinafter, based on the illustrated embodiment, that is, the plate holder 110 of the recliner 100 is fixed to the lower bracket 200 , and the sector tooth of the recliner 100 is Reference will be made to a configuration in which 120 is fixed to the upper bracket 300 .

On the other hand, as described above, the recliner 100 of the reclining device according to the present invention is a guide ring as in the prior art as a means for preventing the separation of internal components including the sector tooth 120 from the plate holder 110 . This is omitted.

That is, the recliner 100 according to the present invention omits the guide ring as in the prior art, but as a means for preventing the separation of the internal components including the sector tooth 120, the rim portion ( A portion of the sector tooth 115 is bent inward in the radial direction to contact the outer surface of the sector tooth 120 , that is, the outer surface of the disk portion 121 to form the bending portion 116 .

In this way, by configuring a part of the rim portion 115 of the plate holder 110 as a bending portion 116 as a separation preventing means, the lower bracket 200 can be directly fixed to the rim portion 115 of the plate holder 110 . there will be

In the lower bracket 200 to which the plate holder 110 is fixed, while the rim part 115 of the plate holder 110 is inserted, the holder connection hole 230 surrounding the outer circumferential surface of the rim part 115 is formed in a ring-shaped holder. The connection part 220 is formed, and the outer peripheral surface of the rim part 115 and the inner peripheral surface of the holder connection hole 230 are firmly fixed over the whole by welding or the like.

Therefore, by excluding the structure in which the outer surface of the plate holder 110 and one side of the lower bracket 200 are fixed to each other as in the prior art, the reclining device according to the present invention is a specific part of the lower bracket 200 during a rear collision It is possible to fundamentally prevent the occurrence of buckling in the lower bracket 200 due to the concentration of stress in the lower bracket 200 .

Further, the reclining device according to the present invention, not one side of the body portion 111 of the plate holder 110, but directly to the rim portion 115 of the plate holder 110, the holder connection portion 220 of the lower bracket 200 It becomes possible to fix the rotation axis (X-X') direction width and weight of the reclining device can be significantly reduced compared to the prior art.

In addition, the reclining device according to the present invention, the connection structure between the sector tooth 120 and the upper bracket 300 is configured to have a connection structure similar to the connection structure between the plate holder 110 and the lower bracket 200 .

That is, as shown in FIG. 3 , a center boss 124 protruding in the direction of the rotation axis (X-X′) is formed on the outer surface of the sector tooth 120 , and the upper bracket 300 is the center It is configured to include an annular sector-tooth connection part 320 in which a sector-tooth connection hole 330 into which the boss 124 is inserted is formed.

In this way, by firmly fixing between the outer circumferential surface of the center boss 124 of the sector tooth 120 and the inner circumferential surface of the sector tooth connection hole 330, not the outer surface of the sector tooth 120, by welding or the like over the entirety, The width and weight in the direction of the rotation axis (X-X') of the reclining device can be further reduced.

Meanwhile, as shown, since the outer diameter of the center boss 124 is smaller than the outer diameter of the rim part 115 , the outer peripheral surface of the center boss 124 of the sector tooth 120 and the sector tooth connection hole of the upper bracket 300 . The contact area between the inner circumferential surface of the plate holder 110 is smaller than the contact area between the outer circumferential surface of the rim portion 115 of the plate holder 110 and the inner circumferential surface of the holder connection hole 230 of the lower bracket 200 .

Therefore, the welded portion between the outer circumferential surface of the center boss 124 of the sector tooth 120 and the inner circumferential surface of the sector tooth connection hole 330 of the upper bracket 300 has relatively weaker strength, and when the same load is applied, the center Since the fixed state between the boss 124 and the sector tooth connection hole 330 is released, there is a possibility that slip occurs between them.

In order to prepare for such a decrease in connection strength and the possibility of slipping, as shown in FIG. 3 , a rotation preventing protrusion 125 protruding in a direction perpendicular to the rotation axis is provided on the outer circumferential surface of the sector tooth 120 , A step portion 340 corresponding to the rotation preventing protrusion 125 is formed in the sector tooth connection hole 330 of the connection portion 320 .

Figure 5 is a cross-sectional view of the reclining device shown in Figure 3 A-A', Figure 6 is a partial enlarged view of Figure 5, in accordance with the present invention compared to the prior art in the rotation axis (X-X') direction reduced The configuration is shown in the reclining device having a width (D).

As described above, the present invention omits the guide ring as in the prior art, and the position where the guide ring in the prior art was disposed, that is, the holder of the lower bracket 200 directly on the outer circumferential surface of the rim portion 115 of the plate holder 110 . By attaching the connection part 220 in a manner such as welding, the width D in the direction of the rotation axis (X-X') of the reclining device can be significantly reduced.

However, in the reclining device according to the present invention, the bending portion 116 for preventing the separation of the internal component including the sector tooth 120 but omitting the guide ring in the prior art is formed on the rim portion 115 .

That is, in the assembly sequence of the recliner 100 , the pole tooth 130 , the actuating cam 140 , and the cam spring 150 corresponding to the internal components are the disc part 121 and the rim part 115 of the plate holder 110 . ), the sector tooth 120 is moved in the direction of the rotation axis (X-X') after being inserted into the internal receiving space formed by 121 is inserted into the receiving space of the plate holder 110 .

Next, the bending portion 116 is formed by bending the end of the rim portion 115 on the side opposite to the disk-shaped body portion 111 of the plate holder 110 in the radial direction, and the bending portion 116 is formed. Bending portion 116 for preventing separation of internal components by further bending the outer surface of the disk portion 121 of the sector tooth 120, that is, to be in close contact with a position corresponding to the radially outer side of the center boss 124 formation is complete.

In this case, the inner surface of the bending part 116 and the outer surface of the disk part 121 are in close contact with each other, but since they are not mutually fixed, the sector tooth 120 is rotated relative to the plate holder 110 . possible state is maintained.

On the other hand, when forming the bending part 116, in order to facilitate bending and prevent interference with the sector tooth 120 at the position where the bending of the bending part 116 starts, as shown in FIG. Between the rim part 115 and the bending part 116 , it is preferable to provide a cutting part 117 having a thinner thickness than the rim part 115 .

On the other hand, in order to increase the contact area (d) and the connection strength between the outer surface of the rim portion 115 and the inner surface of the holder connection hole 230, which are mutually fixed in a manner such as welding, the holder connection portion of the reclining device according to the present invention At 220 , a burring part 240 is formed over the circumference of the holder connection hole 230 .

That is, as shown in FIG. 6 , a burring part 240 protruding and extending in the direction of the rotation axis (X-X') is provided around the holder connection hole 230 of the lower bracket 200, and the burring part ( By performing welding (W) between the inner surface of the 240 and the outer surface of the rim portion 115, it is possible to increase the contact area (d) between them and to improve the connection strength.

However, in this case, as shown in FIG. 6 , the burring part 240 protrudes and extends in a direction away from the sector tooth 120 , so that the position at which the welding W is performed is a disk shape of the plate holder 110 . It is preferable to be positioned in the direction of the rotation axis (X-X') corresponding to the body portion 111 .

This is to prevent a phenomenon in which the plate holder 110 and the sector tooth 120, which are provided to be rotatable relative to each other, are deformed by welding heat, and the operating force is rapidly increased.

As such, those skilled in the art to which the present invention pertains will understand that the above-described technical configuration of the present invention may be implemented in other specific forms without changing the technical spirit or essential characteristics of the present invention.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the foregoing detailed description, and the meaning and scope of the claims And all changes or modifications derived from the equivalent concept should be construed as being included in the scope of the present invention.

Claims (9)

A reclining device for a vehicle seat comprising: an upper bracket connected to the seatback frame; a lower bracket connected to the seat cushion frame; and a recliner connected between the upper bracket and the lower bracket to adjust an angle of the seatback frame. ,
The recliner is
a plate holder comprising: a disk-shaped body portion having a plurality of guide protrusions on one side thereof; and a cylindrical rim portion formed to protrude from an edge of one side of the disk-shaped body portion;
a sector tooth which is rotatably inserted into the receiving space formed by the disc-shaped body part and the rim part about a rotational axis that is the central axis of the disc-shaped body part, and an internal gear is formed on an inner circumferential surface;
a plurality of pole teeth disposed between the disk-shaped body part and the sector tooth to guide movement by the plurality of guide protrusions, and each having an external gear meshing with the internal gear;
including,
The rim portion, the vehicle seat reclining device, characterized in that provided with a bending portion is bent to contact the outer surface of the sector tooth is integrally formed with the rim portion. According to claim 1,
A device for reclining a vehicle seat, characterized in that a separate separation preventing means for preventing the sector tooth from being separated from the accommodation space is omitted. According to claim 1,
Between the rim part and the bending part, a reclining device for a vehicle seat, characterized in that a cutting part having a thinner thickness than the rim part is provided. According to claim 1,
An outer peripheral surface of the rim portion is a reclining device for a vehicle seat, characterized in that directly fixed to any one of the upper bracket and the lower bracket. 5. The method of claim 4,
Any one of the upper bracket or the lower bracket is fixed to the rim portion and includes a ring-shaped holder connecting portion,
The reclining device for a vehicle seat, characterized in that the outer peripheral surface of the rim part is inserted into the inner peripheral surface of the holder connection part and welded. 6. The method of claim 5,
The holder connecting portion includes a burring portion extending in the direction of the rotation axis,
The reclining device for a vehicle seat, characterized in that the inner peripheral surface of the burring part is welded to the outer peripheral surface of the rim part. 5. The method of claim 4,
A center boss protruding in the direction of the rotation axis is formed on the outer surface of the sector tooth,
The other one of the upper bracket and the lower bracket is a reclining device for a vehicle seat, characterized in that it comprises a ring-shaped sector-tooth connecting portion into which the center boss is inserted. 8. The method of claim 7,
A reclining device for a vehicle seat, characterized in that the outer peripheral surface of the center boss is welded to the inner peripheral surface of the sector tooth connection part. 9. The method of claim 8,
An anti-rotation protrusion formed to protrude in a direction perpendicular to the rotation axis is provided on the outer peripheral surface of the center boss,
Reclining device for a vehicle seat, characterized in that the sector tooth connection portion has a step portion corresponding to the anti-rotation projection is formed.

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