JP2007312935A - Seat reclining device provided with load adjusting structure of seat back - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a shock caused by folding etc. can cause an unexpected fault since a conventional seat reclining device has a constitution of winding a leaf spring on an operation shaft put through a locking mechanism and a casing, engaging the leaf spring to the casing and the operation shaft, and rotating the operation shaft by operation of a handle to lock and unlock the locking mechanism for tensing/relaxing the leaf spring, so that folding of the reclining seat depends on rebounding force of the leaf spring exclusively. <P>SOLUTION: One end of a spring which regulates reclining is fixed to the locking mechanism which locks and unlocks a seat reclining mechanism, and the other end is fixed to a second medium pivotally fitted to the main body of the seat reclining mechanism. By the regulation of the spring, the spring is compressed when the seat back is inclined backward, and the compression of the spring is relaxed when the seat back is inclined forward. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seat reclining device having a load adjustment structure for a seat back of a vehicle.

  A seat reclining device mounted on a conventional vehicle has a structure that is provided together with a lock mechanism, and a leaf spring is mounted on an operation shaft that penetrates the casing of the lock mechanism. It is structured to be locked to the casing and the operating shaft. Therefore, the operation shaft is moved via the handle operation, and the lock mechanism is locked and unlocked, whereby the leaf spring is tensioned and relaxed (tension release).

  In this conventional configuration, the folding of the reclining seat (which is a seat cushion and / or a seat back frame) depends exclusively on the repulsive force of the leaf spring, so that the impact during folding sometimes causes unexpected damage. Is thought to occur for a while.

  An example of the failure will be described. [1] is a problem of shock to a person. For example, injuries and fears to weak people such as infants, elderly people, sick people, etc., or hard members provided on the seat may damage the weak people, and damage and / or damage to easily damaged items such as glasses. Or it has been pointed out to destroy. [2] is a problem for ensuring functions in accordance with various types and forms of vehicles and / or seats. For example, when it is desired to quickly fold and / or raise the seat (standing at an appropriate inclination angle “standard seating position angle”), the seat can be folded and / or raised with speed and / or speed changes. In addition, it is mentioned that it is not always possible to properly cope with these operations.

  The following documents (1) to (3) are listed when prior documents that meet the demands related to [1] and [2] are listed.

  Document (1) is a “sheet reclining device” disclosed in Japanese Patent Application Laid-Open No. 2002-101997. In the present invention, an upper arm, a lower arm and / or a hook lever that are rotatably supported on a shaft of a seat back frame are provided, a return spring is provided between the hook lever and the lower arm, and the seat back frame is moved forward. In some cases, the locking mechanism is released, the return spring for the upper arm does not act, the acceleration based on the rotation of the seat back is not applied, the sudden return of the seat back frame is avoided, and the return spring is reduced in size. Provided is a seat reclining device.

  Reference (2) is a “sheet reclining device with a table mechanism” disclosed in Japanese Patent Laid-Open No. 2001-120381. In this invention, a lock pawl engaged with and disengaged from a ratchet tooth portion of a ratchet wheel fixed to a center shaft of a base bracket is pivotally supported by an intermediate plate, and the lock pawl is engaged with a cam plate having a long hole through a pin. This cam plate is urged clockwise by a spring (spiral spring) fitted to the center shaft, and the wire provided on the cam plate is fitted to the pulley, and the pulley is fixed to the frame of the arm plate, The arm plate is tilted forward through the rotation of the pulley, and the seat back tilts forward with the table lock released as a limiting condition, thereby avoiding the hammer state of the seat back and impacting the passenger. Provided is a fully flat seat reclining device that does not give.

  Document (3) is a “sheet reclining device” disclosed in Japanese Patent Application Laid-Open No. 2004-65297. The outline is a configuration in which one end of a spring is locked to the casing and the other end is locked to a seat back frame, which is detachably provided on a lock mechanism that controls locking and unlocking of the reclining mechanism, Proposed is a seat reclining device capable of avoiding a sudden forward tilt of the seat back by controlling the spring by a regulating means provided on the casing. Although this document (3) is an invention proposed by the present applicant, the present applicant has applied for many inventions with further improvements.

JP2002-101997 JP2001-120381A JP 2004-65297 A

  The inventions of the above-mentioned literature (1) and literature (2) regulate one side of the seat back (seat back frame), avoid sudden folding (forward tilt) of the seat back, and ensure reliable and smooth seating. In this configuration, the movement is ensured, and the repulsive force of the spring is restricted on one hand, and the impact is absorbed when the seat is folded through a configuration in which this restriction is applied to the entire spring. Therefore, it is not necessarily sufficient in terms of absorbing an acceleration impact accompanying rotation when the seat mainly composed of a spring is folded or avoiding various obstacles due to the impact.

  Moreover, although literature (1) and literature (2) employ | adopt the structure which regulates the end of a spring, the structure which combined use of various components and other incidental equipment and / or complicated movement is employ | adopted. Therefore, there are problems such as structural restrictions, complicated structure, difficulty in assembly, and cost increase.

  Furthermore, the document (3) is an invention that effectively uses the shape and / or dimensions of the spring and is effective. However, in order to surely achieve the demands for the seats of the recent years, further improvements are required in terms of reducing the size and / or weight of the spring and simplifying the mounting of the spring and / or the entire device. It is a place to be done. In view of such a situation, the present applicant proposes the present invention in order to meet this demand.

  The invention of claim 1 employs a spring configuration in which one end is fixed to the lock mechanism and the other end is fixed to the second medium pivotally attached to the main body of the seat reclining mechanism. The seat back is forwardly tilted (advanced, ie, folded) through the movement of the other end of the spring interlocked with the seat, thereby reducing the impact caused by the forward tilting rotation of the seat back, and the seat back (seat back frame ) Is intended for quick, gentle and reliable folding and / or movement, etc., or for its return speed to be gentle and gentle after standing up vertically. In this way, it is intended to eliminate the above-mentioned problems by eliminating the impact. The invention of claim 1 is intended to reduce the size and weight of the spring, simplify the mounting of the spring and / or the entire apparatus, etc. by adopting the configuration described above.

Claim 1 is a seat reclining mechanism attached to a lock mechanism for controlling locking and unlocking,
A spring having one end fixed to the main body of the lock mechanism or the seat frame, and the other end fixed to a second medium pivotally attached to the main body of the seat reclining mechanism;
A first medium comprising a first gear meshing with the second gear of the second medium;
A link in which the first medium is fixed at one end and the other end is movably provided on the seat back frame;
When the other end of the link is moved rearwardly in the seatback frame and moved backward (backward), the first gear of the first medium is rotated, and the second medium is rotated by this rotation. The seat reclining device is provided with a seat back load adjustment structure configured to rotate the second gear and compress the spring.

  The invention of claim 2 is intended to achieve the object of claim 1 and to propose a structure for assembling the seat reclining device optimal for achieving this object.

Claim 2 is a seat reclining device provided with the load adjustment structure of the seat back according to claim 1,
The seat reclining mechanism is provided with a central shaft and a plurality of receiving pieces on the surface of the main body of the locking mechanism, and the shaft that is fitted to the central shaft and the inserted piece that is inserted (locked) into the receiving portion of the receiving piece. On the back of the main body,
The seat back load adjustment is configured such that the lock mechanism and the seat reclining mechanism can be assembled integrally through the shaft fitting to the central shaft and the insertion pieces being inserted into the receiving portions of the plurality of receiving pieces. A seat reclining device having a structure.

  The invention of claim 3 is intended to achieve the object of claim 1 and to propose a structure of a stopper mechanism optimal for achieving this object.

Claim 3 is a seat reclining device provided with the load adjustment structure of the seat back according to claim 1,
A seat reclining device provided with a seat back load adjustment structure in which a stopper piece is provided on the surface of the main body of the lock mechanism, and an end portion in the short direction of the link is stopped against the stopper piece.

  The invention of claim 4 is intended to achieve the object of claim 1 and to propose an optimum structure of the link mechanism for achieving the object.

Claim 4 is a seat reclining device provided with the load adjustment structure of the seat back according to claim 1,
A seat back load adjustment structure in which a long hole is opened on the other end of the link, a pin provided on the seat back frame is inserted into the long hole, and the pin is movable in the long hole. A seat reclining device provided.

  The invention of claim 5 is intended to achieve the object of claim 1 and to propose a structure of a seat reclining device capable of exhibiting optimum characteristics for achieving this object.

Claim 5 is a seat reclining device provided with the load adjustment structure of the seat back according to claim 1,
The third medium is pivotally supported on the seat back frame, and the third gear provided on the third medium is engaged with the first gear of the first medium pivotally supported on the seat frame. The first gear of the first medium is engaged with the second gear of the second medium pivotally attached to the seat frame, and the other end of the spring is locked to the second medium, and one end of the spring is also engaged. Is configured to be locked to the seat frame,
When the third gear of the third medium is moved by the backward tilt of the seat back frame, the first gear of the first medium is rotated, and the second gear of the second medium is rotated by this rotation. The seat reclining device is provided with a seat back load adjustment structure configured to rotate the gears and compress the spring.

  The invention of claim 6 is intended to achieve the object of claim 5 and to propose a structure of a spring mechanism optimal for achieving this object.

Claim 6 is a seat reclining device provided with the load adjustment structure of the seat back according to claim 5.
The other end of the spring is locked to a second medium pivotally supported on the shaft of the seat reclining mechanism (the shaft fitted on the central axis of the lock mechanism), and one end thereof is pivotally supported on the shaft of the seat reclining mechanism. And locking to the first medium linked to the third medium,
A structure in which the third medium is rotated when the seat back frame of the seat back is tilted, the first medium and the second medium are rotated by this rotation, and the spring is compressed by these rotations; This is a seat reclining device provided with a seat back load adjustment structure.

  The invention of claim 7 is intended to achieve the object of claim 1 and to propose a structure of a regulating piece of a spring mechanism that is optimal for achieving this object.

Claim 7 is a seat reclining device provided with the load adjustment structure of the seat back according to claim 1.
A seat reclining device provided with a seat back load adjustment structure in which a restriction piece for restricting an extended annular end of the spring at the time of relaxation of the spring is provided on a seat back frame or a body of a seat reclining mechanism.

The invention of claim 1 is a seat reclining mechanism attached to a lock mechanism that controls locking and unlocking,
A spring having one end fixed to the main body of the lock mechanism or the seat frame, and the other end fixed to the second medium pivotally attached to the main body of the seat reclining mechanism;
A first medium comprising a first gear meshing with a second gear of the second medium;
A link in which the first medium is fixed to one end and the other end is movably provided on the seat back frame;
When the other end of the link is moved backwardly and backwardly (backward) when the seat back frame is tilted backward, the first gear of the first medium is rotated, and the second gear of the second medium is rotated by rotation. Is a seat reclining device provided with a seat back load adjustment structure configured to rotate the spring and compress the spring.

  Accordingly, claim 1 employs a spring configuration in which one end is fixed to the lock mechanism and the other end is fixed to the second medium pivotally attached to the main body of the reclining mechanism. By tilting the seat back forward through the movement of the other end of the interlocking spring, it is possible to reduce the impact caused by the forward tilt rotation of the seat back, and to fold the seat back quickly and gently and reliably. It has features such as being able to move and the like, or its return speed can be made gentle and gentle after standing up vertically. Thus, by eliminating the impact, there is an actual benefit that the above-mentioned problems can be solved. The invention of claim 1 is characterized in that, by adopting the above-described configuration, the size and weight of the spring can be reduced, and the mounting of the spring and / or the entire apparatus can be simplified.

Invention of Claim 2 is a seat reclining device provided with the load adjustment structure of the seat back of Claim 1,
A center shaft and a plurality of receiving pieces are provided on the surface of the main body of the locking mechanism, and the back surface of the main body of the seat reclining mechanism is inserted into the shaft fitted on the central shaft and inserted (locked) into the receiving portion of the receiving piece. Provided in
A seat back load adjustment structure in which a lock mechanism and a seat reclining mechanism can be assembled integrally through fitting of a shaft to a central shaft and insertion of an insertion piece into a receiving portion of a plurality of receiving pieces. A seat reclining device provided.

  Accordingly, the second aspect has features such that the object of the first aspect can be achieved and a structure for assembling the seat reclining device optimal for achieving the object can be proposed.

The invention of claim 3 is a seat reclining device provided with the load adjustment structure of the seat back according to claim 1,
A seat reclining device provided with a seat back load adjustment structure in which a stopper piece is provided on the surface of the main body of the lock mechanism, and the end of the link in the short direction is stopped against the stopper piece.

  Therefore, the third aspect has the characteristics that the object of the first aspect can be achieved, and the structure of the stopper mechanism which is optimal for achieving the object can be proposed.

The invention of claim 4 is a seat reclining device comprising the seat back load adjusting structure of claim 1,
Seat reclining with a seat back load adjustment structure in which a long hole is opened on the other end of the link, a pin provided on the seat back frame is inserted into the long hole, and the pin can move within the long hole. Device.

  Therefore, claim 4 has the characteristics that the object of claim 1 can be achieved, and that the structure of the link mechanism optimal for achieving this object can be proposed.

The invention of claim 5 is a seat reclining device provided with the load adjustment structure of the seat back according to claim 1,
The third medium is pivotally supported on the seat back frame, the third gear provided on the third medium is meshed with the first gear of the first medium pivotally supported on the seat frame, and the first medium The first gear is engaged with the second gear of the second medium pivotally attached to the seat frame, the other end of the spring is locked to the second medium, and one end of the spring is engaged with the seat frame. It is configured to stop,
When the third gear of the third medium moves when the seat back frame is tilted backward, the first gear of the first medium is rotated, and the second gear of the second medium is rotated by rotation. A seat reclining device having a seat back load adjustment structure configured to compress a spring.

  Therefore, claim 5 has the characteristics that the object of claim 1 can be achieved and the structure of the seat reclining device capable of exhibiting the optimum characteristics for achieving this object can be proposed.

The invention of claim 6 is a seat reclining device provided with the load adjustment structure of the seat back according to claim 5,
The other end of the spring is locked to the second medium pivotally supported on the shaft of the seat reclining mechanism (the shaft fitted on the central axis of the lock mechanism), and one end is pivotally supported on the shaft of the seat reclining mechanism. Lock to the first medium linked to the three media,
The seat back of the seat back configured to rotate the third medium by rotating the back of the seat back frame of the seat back, rotate the first medium and the second medium by rotation, and compress the spring by these rotations. It is a seat reclining device provided with a load adjustment structure.

  Therefore, claim 6 has the characteristics that the object of claim 5 can be achieved and the structure of the spring mechanism that is optimal for achieving the object can be proposed.

The invention of claim 7 is a seat reclining device provided with the load adjustment structure of the seat back according to claim 1,
A seat reclining device provided with a seat back load adjustment structure in which a regulating piece for regulating an extended annular end of a spring when the spring is relaxed is provided on a seat back frame or a body of a seat reclining mechanism.

  Accordingly, the seventh aspect has the characteristics that the object of the first aspect can be achieved, and the structure of the regulating piece of the spring mechanism that is optimal for achieving the object can be proposed.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, in FIG. 1-1 to FIG. 1-3, a side schematic view of an example showing a part and / or the whole of each type of seat, A is a vehicle seat, and this seat A is a seat back frame. A seat cushion A2 provided on the seat side of A1 and a seat back A3 provided on the back side of the seat back frame A1. In FIG. 1-1, this seat A shows a general vehicle driver's seat A, and in FIG. 1-2, a general vehicle driver's seat and a rear row double seat A are shown. Further, in FIG. 1-3, a three-row seat A of a general vehicle is shown.

  B is a lock mechanism provided on the seat back frame A1, and the lock mechanism B includes a lock / unlock mechanism for raising and folding the seat back A3. Further, the lock mechanism B is provided with return means such as a spring (not shown) for controlling the return of the operation handle D. In the figure, E indicates a headrest.

  2 to 4 show a first embodiment. In the figure, reference numeral 1 denotes a spiral spring. One end 1a of the spring 1 is connected to a locking mechanism via a main body 2 of a seat reclining mechanism C. A second body is engaged with a main body B (described later) or a seat back side of a seat back A3 (hereinafter referred to as a seat frame A4), and the other end 1b is pivotally attached 3a to a main body 2 of a seat reclining mechanism C described later. Secure to the medium 3.

  The second gear 30 provided on the second medium 3 is configured to mesh with the first gear 40 provided on the first medium 4 pivotally supported on the main body 2. In the figure, reference numeral 5 denotes a link. One end 5a of the link 5 is fixed to the first medium 4, and the other end 5b is movably provided on the back side of the seat back A3 (hereinafter referred to as the seat back frame A1). . As a result, when the seat back frame A1 is tilted back (retracted) in the direction of the arrow “I”, the first medium 4 rotates in the direction of the arrow “B” about the pivot 4a. With this rotation, the second medium 3 rotates in the direction of the arrow “c”. The rotation in the direction of the arrow “c” compresses substantially the entire spring 1 with the other end 1b of the spring 1 as a base point. That is, the state changes from FIG. 2 to FIG. The reaction force reaching the standing position (forward tilting) is held in the seat back A3 through the backward tilting of the seat back frame A1 and the compression of the spring 1. For example, it is accumulated as the repulsive force shown in FIG. A pin 6 provided in the seat back frame A1 is loosely fitted in the long hole 50 provided in the other end 5b of the link 5. When the seat back frame A1 is movable (back and forth), the link 5 Assures movement such as free movement and / or rocking.

  The seat reclining mechanism C is fixed using the center shaft 10 and the receiving piece 11 provided on the main body 8 of the lock mechanism B. In other words, the mounting hole 12 and the insertion piece 13 provided in the main body 2 of the seat reclining mechanism C (the insertion pieces 13 are provided at three locations to ensure stability in securing or the like are effective). By being engaged with the shaft 10 and the receiving piece 11, it can be reliably assembled with one touch. Therefore, assembly with a robot and retrofitting to the lock mechanism B are possible, which is useful, and can contribute to versatility and cost reduction. Although not shown, it is also beneficial to provide several holes for jig insertion in the main body 2. Reference numeral 11a denotes a receiving portion of the receiving piece 11.

  In the figure, reference numeral 15 denotes a stopper piece provided on the main body 8. This stopper piece 15 regulates the end point of the seat back frame A1 when it is tilted back and forth, and avoids overshoot of the seat back frame A1 and failure.

  The first medium 4 includes a first gear 40, and the second medium 3 includes a second gear 30. The first gear 40 and the second gear 30 mesh with each other, and the movement of the second gear 30 relative to the movement of the first gear 40 is increased or decreased (of the seat back frame A1). Change the rotation ratio in order to secure the distance to tilt back and forth). That is, the pitch of the first gear 40> the pitch of the second gear 30 or the pitch of the first gear 40 <the pitch of the second gear 30 is set. Of course, there may be an example of the same pitch.

  5 to 6 are in accordance with the first embodiment shown in FIGS.

  Further, in the third embodiment shown in FIGS. 7 to 9, the third medium 20 provided in the seat back frame A <b> 1 and the third gear 200 provided in the third medium 20 are operated. Thus, the link 5 used in each of the above-described embodiments is omitted, and the problem (impact with the seat reclining mechanism C) caused by the link 5 is solved, the cost is reduced, and the size is reduced. In this example, a support arm 201 is formed on the third medium 20, and the shaft 21 (sheath tube) of the seat reclining mechanism C is fitted to the central shaft 10 provided on the main body 8 of the lock mechanism B. ). Therefore, the third medium 20 can be configured to be engaged with the seat back frame A1 and the main body 8 of the lock mechanism B. The other end 1 b of the spring 1 is locked to the shaft 21 via the second medium 3, and the one end 1 a is locked to the first medium 4 via the intermediate medium 41. The movement such as compression is in accordance with the above-described embodiments. The center of the spring 1 is loosely fitted to the shaft 21, and the other end 1 b is moved in the direction of the arrow “d” by the rotation of the first medium 4. One end 1a of the second medium 3 moves in the direction of arrow “e” as the second medium 3 rotates. In other words, in this example, one end 1a and the other end 1b of the spring 1 are configured to always move in the opposite direction and return to each other, speeding up the return of the seat back frame A1 (seat back A3), and the seat back frame A structure that can effectively cope with the load of A1 (seat back A3).

  In the figure, reference numeral 22 denotes a restricting piece, which restricts the extended annular end of the spring 1 and adjusts excessive return. And the spring 1 applicable to all the sheet | seats A is provided. In addition, it is intended to provide a structure that can adjust the back and forth of the seat back A3, to enhance the applicability to the vehicle and to ensure the commonality of parts.

  The schematic diagram shown in FIG. 10 is a diagram showing the correlation between the load and the seat back angle (movement distance), and shows the conventional characteristics and the characteristics of the present invention or the best characteristics. Yes, the tilt angle, the load and the return speed are considered and shown as data, and the ideal return of the seat back A3 and the return speed are shown. In accordance with this characteristic, the pitch of the first gear 40 of the first medium 4 and / or the second gear 30 of the second medium 3, the length of the link 5, the mounting position, the repulsion of the spring 1. Adjust the force, thickness, width, etc., respectively.

Side schematic diagram of an example showing part of the sheet Side schematic view of an example showing the entire two-row sheet Example side view showing the entire three-row sheet Front schematic view of the relaxed state of the spring showing the first embodiment Front schematic diagram of the compressed state of the spring in the first embodiment Cross-sectional schematic diagram of the first embodiment Cross-sectional schematic diagram of the exploded state of the first embodiment Front schematic diagram of the relaxed state of the spring showing the second embodiment Front schematic diagram of the compressed state of the spring in the second embodiment Front schematic view of the spring in the relaxed state showing the third embodiment Cross-sectional schematic diagram of the third embodiment Cross-sectional schematic diagram of the main part of the third embodiment Schematic diagram showing the characteristics of the seat back

Explanation of symbols

A Seat A1 Seat back frame A2 Seat cushion A3 Seat back A4 Seat frame B Lock mechanism C Seat reclining mechanism D Operation handle E Headrest 1 Spring 1a One end 1b Other end 2 Main body 20 Third medium 200 Third gear 201 Support arm 21 Shaft 22 restricting piece 3 second medium 30 second gear 3a pivoting 4 first medium 40 first gear 41 intermediate medium 4a pivoting 5 link 5a one end 5b other end 50 long hole 6 pin 8 main body 10 central axis 11 receiving piece 11a receiving portion 12 mounting hole 13 inserting piece 15 stopper piece

Claims (7)

A seat reclining mechanism attached to a lock mechanism that controls locking and unlocking,
A spring having one end fixed to the main body of the lock mechanism or the seat frame, and the other end fixed to a second medium pivotally attached to the main body of the seat reclining mechanism;
A first medium comprising a first gear meshing with the second gear of the second medium;
A link in which the first medium is fixed at one end and the other end is movably provided on the seat back frame;
When the other end of the link is moved rearwardly in the seatback frame and moved backward (backward), the first gear of the first medium is rotated, and the second medium is rotated by this rotation. A seat reclining device provided with a seat back load adjustment structure configured to rotate the second gear and compress the spring. In the seat reclining device provided with the load adjustment structure for the seat back according to claim 1,
The seat reclining mechanism is provided with a central shaft and a plurality of receiving pieces on the surface of the main body of the locking mechanism, and the shaft that is fitted to the central shaft and the inserted piece that is inserted (locked) into the receiving portion of the receiving piece. On the back of the main body,
The seat back load adjustment is configured such that the lock mechanism and the seat reclining mechanism can be assembled integrally through the shaft fitting to the central shaft and the insertion pieces being inserted into the receiving portions of the plurality of receiving pieces. Seat reclining device with structure. In the seat reclining device provided with the load adjustment structure for the seat back according to claim 1,
A seat reclining device provided with a seat back load adjustment structure in which a stopper piece is provided on the surface of the main body of the lock mechanism, and the end of the link in the short direction is stopped against the stopper piece. In the seat reclining device provided with the load adjustment structure for the seat back according to claim 1,
A seat back load adjustment structure in which a long hole is opened on the other end of the link, a pin provided on the seat back frame is inserted into the long hole, and the pin is movable in the long hole. Seat reclining device provided. In the seat reclining device provided with the load adjustment structure for the seat back according to claim 1,
The third medium is pivotally supported on the seat back frame, and the third gear provided on the third medium is engaged with the first gear of the first medium pivotally supported on the seat frame. The first gear of the first medium is engaged with the second gear of the second medium pivotally attached to the seat frame, and the other end of the spring is locked to the second medium, and one end of the spring is also engaged. Is configured to be locked to the seat frame,
When the third gear of the third medium is moved by the backward tilt of the seat back frame, the first gear of the first medium is rotated, and the second gear of the second medium is rotated by this rotation. A seat reclining device provided with a seat back load adjustment structure configured to rotate the gear of the seat and compress the spring. In the seat reclining device provided with the load adjustment structure of the seat back according to claim 5,
The other end of the spring is locked to a second medium pivotally supported on the shaft of the seat reclining mechanism (the shaft fitted on the central axis of the lock mechanism), and one end thereof is pivotally supported on the shaft of the seat reclining mechanism. And locking to the first medium linked to the third medium,
A structure in which the third medium is rotated when the seat back frame of the seat back is tilted, the first medium and the second medium are rotated by this rotation, and the spring is compressed by these rotations; A seat reclining device equipped with a seat back load adjustment structure. In the seat reclining device provided with the load adjustment structure for the seat back according to claim 1,
A seat reclining device provided with a seat back load adjustment structure in which a restriction piece for restricting an extended annular end of the spring at the time of relaxation of the spring is provided on a seat back frame or a body of a seat reclining mechanism.

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