JP2008006265A - Reclining device for seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining device by a highly durable differential transmission mechanism (taumel mechanism) without causing delamination in a resin layer of a bearing bush inside an externally toothed gear by improving the service durability of the differential transmission mechanism having the externally toothed gear to which the bearing bush is attached. <P>SOLUTION: In the differential transmission mechanism, an internally toothed gear 1 is meshed with the externally toothed gear 2 having teeth slightly less in number than the internal gear, and a pair of wedge-shaped pieces 6 and 6' are arranged in an arcuate gap formed between the bearing bush 10 disposed in the shaft hole 3 of the externally toothed gear 2 and the small diameter portion of a cam 5 that is formed integrally with the shaft 4 of the internally toothed gear 1. The arrangement of the pair of wedge-shaped pieces 6 and 6' is such that tapered ends 6a and 6'a thereof are opposite to each other. At least the outer surfaces 6b and 6'b of the wedge-shaped pieces 6 and 6' are formed of a material having low sliding friction. This is because they function as frictional sliding contact surfaces when the wedge-shaped pieces 6 and 6' are pressed by the cam 5 that is formed integrally with the shaft 4 of the internally toothed gear 1 and moved in the arcuate gap in a sliding manner. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seat reclining device, and more particularly to a seat reclining device suitable for an automobile seat reclining device or the like.

  2. Description of the Related Art Generally, a seat reclining device is known in which a differential transmission mechanism of a gear is used for adjusting an opening angle of a hinge that joins a seat surface portion and a backrest portion of a seat, and a backrest inclination angle can be adjusted.

  A differential transmission mechanism using gears in a conventional seat reclining device will be described with reference to FIG. 4 and with reference to FIGS. 1 and 3. The difference between the gears on the hinge connecting the seat surface portion and the backrest portion of the seat will be described. A power transmission mechanism is provided.

  In this differential transmission mechanism, an internal gear 1 (see FIG. 1) and an external gear 2 having a smaller number of teeth are meshed with each other, and a ring-shaped bearing bush 10 is fitted in the shaft hole of the external gear 2. Then, as shown in FIG. 4, a pair of wedge-shaped pieces 16 and 16 'are tapered end portions 16a in an arcuate gap formed between the bearing bush 10, the shaft 4 of the internal gear 1 and the sliding bearing 11. , 16′a are arranged so as to be opposite to each other, and a compression coil spring 7 is provided for applying an elastic force in a direction in which both wedge-shaped pieces are separated from each other.

  When the wedge-shaped pieces 16 and 16 'slide and move within the arc-shaped gap by the operation of the sliding bearing 11 provided on the shaft 4 of the internal gear 1 and the projection 11a, the external gear 2 The inclination angle of the backrest can be adjusted away from the gear 1.

  Such a differential transmission mechanism is also referred to as a Taumel mechanism, and in an automobile seat reclining device using the differential transmission mechanism, the bearing bush 10 is provided inside the external gear 2 as described above. The wedge-shaped pieces 16 and 16 'are in frictional sliding contact with each other to facilitate the operation (Patent Documents 1 and 2).

  Such a bearing bush 10 has a sliding surface made of a resin having good slidability. For example, the bearing bush 10 has a laminated structure shown in FIG. 3 and is formed of a back metal 10a and a sintered compact on the back metal 10a. There is a laminate composed of a porous sintered layer 10b and a resin layer 10c made of a slidable resin composition in which the pores of the porous sintered layer 10b are partially filled.

JP-A-3-237904 Japanese Patent Laid-Open No. 2004-3401

  However, the conventional reclining device for seats of automobiles and the like has a problem that the resin layer may be peeled off due to repeated frictional contact between the sliding wedge-shaped piece and the resin layer of the bearing bush.

  Accordingly, an object of the present invention is to solve the above-mentioned problems, improve the use durability of a differential transmission mechanism having an external gear to which a bearing bush is attached, and the resin layer of the bearing bush inside the external gear The seat reclining device can be applied to an automobile seat or the like using a highly durable differential transmission mechanism (taumel mechanism).

  In order to solve the above-described problem, the present invention provides a differential transmission mechanism for adjusting an opening angle of a hinge connecting a seat surface portion and a backrest portion of a seat, and the differential transmission mechanism includes an internal gear, The external gear with fewer teeth is meshed, and a pair of wedge-shaped pieces are opposed to each other in an arcuate gap formed between the shaft hole of the external gear and the shaft of the internal gear. And a spring for applying elastic force in the direction in which both wedge-shaped pieces are separated from each other, and when the wedge-shaped piece is pushed by a cam provided on the shaft of the internal gear and slidably moves in the arc-shaped gap, In the seat reclining device in which the external gear is separated from the internal gear and the opening angle of the hinge can be adjusted, a bearing bush having a sliding surface formed of resin is fixedly provided in the shaft hole of the external gear, and the wedge-shaped piece The friction sliding contact surface is made of low friction sliding material It was as that structure.

  According to the seat reclining device of the present invention configured as described above, the wedge-shaped piece slides within a predetermined arc-shaped gap because the friction-sliding contact surface of the wedge-shaped piece is formed of a low-friction sliding material. When moving, it contacts the resin layer of the bearing bush on the inner peripheral surface of the shaft hole of the external gear and the outer peripheral surface of the shaft of the internal gear via a low friction sliding material.

  Therefore, the resin force of the bearing bush provided on the inner peripheral surface of the shaft hole of the external gear has a smaller frictional force received from the wedge-shaped piece than that of the conventional example having no low friction sliding material. The force to peel off the surface of the bearing becomes small, the bearing bush does not peel from the surface, and delamination hardly occurs.

  When the frictional frictional contact surface of the wedge-shaped piece is made by laminating and integrating a low-friction sliding material via an intermediate layer, the low-friction sliding material can be directly bonded to the substrate by selecting the physical properties of the intermediate layer. Even when the thickness of the wedge bush is low, the lamination can be integrated with a high adhesive force, and the wedge-shaped piece comes into contact with the resin layer of the bearing bush through the low friction sliding material with good durability for long-term use.

  When the low friction sliding material is laminated and integrated with the base material, a metal sprayed layer may be mentioned as an intermediate layer having preferable adhesion. The metal sprayed layer can provide a laminated structure in which the low friction sliding material easily exhibits an anchor effect due to the porous nature of the surface, and the adhesiveness is preferable.

  If a low-friction sliding material such as a resin is formed on the wedge-shaped piece via an intermediate layer, the adhesion strength with the substrate is increased. In particular, it is preferable that the intermediate layer is a metal sprayed layer because the low friction sliding material of the wedge-shaped piece can be firmly adhered to the base material.

  Further, if the metal sprayed layer is made of a soft metal such as a copper alloy, even if the low friction sliding material is worn, the mating material is not worn, which is preferable because the lubricating properties are maintained. . Also, soft metals such as copper alloys have a high thermal conductivity and a high heat dissipation effect, so that the wedge-shaped piece can be prevented from abnormally rising due to frictional heat in the unlikely event of abnormal wear.

  If the low friction coefficient resin is used as the low friction sliding material and is formed as a film, the low friction sliding material can be easily formed.

  In particular, it is preferable that the resin coating is a fluororesin coating because it has excellent low friction characteristics. Moreover, when the fluororesin coating is a fluororesin coating containing one or more solid lubricants selected from graphite, molybdenum disulfide and metal oxides, it is preferable because of high wear resistance and peeling resistance.

  The fluororesin coating contains 60 to 130 parts by weight of binder resin with respect to 100 parts by weight of fluororesin, and 5 to 30 parts by weight of one or more solid lubricants selected from graphite, molybdenum disulfide, and metal oxide. By adopting a fluororesin film composed of the fluororesin composition, it is possible to more reliably provide a low friction property, wear resistance, and peel resistance.

  The present invention relates to a seat reclining device provided with a differential transmission mechanism for adjusting an opening angle of a hinge connecting a seat surface portion and a backrest portion of a seat, wherein the friction sliding surface of the wedge-shaped piece has a low friction sliding surface. Since the wedge-shaped piece comes into contact with the bearing bush in the shaft hole of the external gear via the low-friction sliding material, the resin layer of the bearing bush that comes into friction-sliding contact with the wedge-shaped piece causes peeling. There is an advantage that it becomes a reclining device for a seat such as an automobile seat by a differential transmission mechanism (taumel mechanism) having high durability.

  In particular, when the frictional contact surface of the wedge-shaped piece is formed by laminating and integrating a low-friction sliding material via an intermediate layer such as a metal sprayed layer, the low-friction sliding material is selected based on the properties of the intermediate layer. Even when the adhesive strength is low directly with the material, the adhesive strength can be increased and lamination can be integrated.

  If a low-friction sliding material such as a fluororesin is formed on the wedge-shaped piece via an intermediate layer, the adhesion strength with the base material is increased. In particular, it is preferable if the intermediate layer is a metal sprayed layer because the low friction sliding material of the wedge-shaped piece can be firmly and firmly adhered to the base material. Moreover, what is a fluororesin film | membrane containing a predetermined | prescribed solid lubricant becomes high in abrasion resistance and peeling resistance.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in FIGS. 1 and 2, the embodiment is a reclining device provided with a predetermined differential transmission mechanism for adjusting an opening angle of a hinge connecting a seat surface portion and a backrest portion of a seat. The transmission mechanism meshes the internal gear 1 with the external gear 2 having a slightly smaller number of teeth, and the bearing bush 10 and the internal gear 1 in which the sliding surface disposed in the shaft hole 3 of the external gear 2 is formed of resin. A pair of wedge-shaped pieces 6 and 6 'are arranged in an arc-shaped gap formed between the shaft 4 and the small-diameter portion of the cam 5 integral with the tapered ends 6a and 6'a in opposite directions. At the same time, a compression coil spring 7 is provided for applying an elastic force in a direction in which both the wedge-shaped pieces 6 and 6 ′ are separated from each other. When sliding in the gap, the external gear 2 is separated from the internal gear 1 and the meshing is The seat reclining device in which the opening angle of the hinge can be adjusted, and at least the outer side surfaces 6b and 6'b serving as the friction sliding surfaces of the wedge-shaped pieces 6 and 6 'are formed of a low friction sliding material. .

  The external gear 2 is required to have one or more teeth less than the internal gear 1 and has a number of teeth of 1 to 10, preferably 2 to 5 and usually 1 to 3 if the range is intentionally exemplified. The relationship between the number of teeth is not limited.

  The wedge-shaped pieces 6 and 6 ′ are not particularly limited as long as the tapered end portion 6 a is formed at one end as in the embodiment shown in FIG. 2, and the details of the overall shape and the degree of bending are particularly designed. Can be changed as appropriate.

  Although the compression coil spring is illustrated as the form of the spring that gives the elastic force in the direction in which the two wedge-shaped pieces 6 and 6 ′ are separated from each other, for example, a partially-notched ring-shaped spring, damper, rubber, elastic A well-known component having an elastic action such as resin can be employed.

  Further, as the frictional sliding contact surface of the wedge-shaped piece 6, an outer surface 6 b slidably contacting the bearing bush 10 of the external gear 2 and an inner side surface 6 c slidably contacting the cam 5 integral with the shaft 4 of the internal gear 1 are mainly frictional sliding contact. Although it is a surface, wear resistance is required especially for the outer surface 6b. One or more surfaces including the other front end surface 6d, the spring holding recess 6e, and a pair of opposed front (back) surfaces 6f are also objects to be formed of the low friction sliding material.

  By applying a dipping method or a spraying method, a low friction sliding material made of resin is applied to a part or the whole of the wedge-shaped pieces 6 and 6 ', dried, or heat-cured with drying, thereby friction of the wedge-shaped pieces. A coating of a low friction sliding material can be formed on the sliding surface.

  Normally, the base material of the wedge-shaped pieces 6 and 6 'is made of metal, and in particular, when formed of an iron-based sintered material, a resin-based low friction sliding material coating is applied to the surface thereof. In particular, the adhesiveness is improved, which is preferable.

The low friction sliding material used in the present invention includes what is called a solid lubricant, and known low friction materials such as molybdenum disulfide, graphite, carbon, and fluororesin can be used.
Of these, fluororesins are preferred because they are excellent in low friction properties, have seizure resistance, and are low in cost.

  The fluororesin has only to have heat resistance that can withstand frictional heat. Specifically, PTFE, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, tetra A fluoroethylene-ethylene copolymer, polychlorotrifluoroethylene, an ethylene-chlorotrifluoroethylene copolymer, etc. are mentioned. These may be used singly or in combination of two or more types of copolymers or tricopolymers.

  Among these, PTFE is most preferable among fluororesins because it has the highest heat resistance and exhibits excellent slidability even at room temperature. Furthermore, among PTFE, it is preferable to use lubricant-grade powder PTFE, and examples of commercially available lubricant-grade powder PTFE include Polyflon M15, Lubron L-2 (trade name, manufactured by Daikin Industries, Ltd.), Teflon TLP-10 ( DuPont brand name), Fullon G163 (Asahi Glass brand name) and the like. Note that the lubricant-grade powder PTFE means regenerated PTFE obtained by pulverizing PTFE that has been fired once, PTFE powder obtained by subjecting PTFE to a low molecular weight by gamma irradiation treatment, and examples of commercially available products that have been subjected to gamma radiation treatment include There is KT400H (Kitamura Co., Ltd. trade name).

  The form of PTFE may be a powder for molding or a fine powder for so-called solid lubricant, and its average particle size is in the range of 0.1 to 20 μm, preferably 0.2 to 10 μm. Things are good. If the average particle size is within this range, the PTFE powder hardly aggregates in the coating agent and is evenly dispersed in the coating.

  The fluororesin coating can be provided with improved wear resistance and peel resistance by using a binder resin in combination. The binder resin firmly adheres to the underlying wedge-shaped piece made of sintered material without thermally degrading the fluororesin coating, and also serves to bind the fluororesin and other compounds in powder form. Examples of the binder resin include a polyimide resin, an epoxy resin, a phenol resin, a silicone resin, and the like. Among these, the polyimide resin is most excellent in heat resistance and adhesion.

  Specific examples of the polyimide resin include polyimide resin (PI), polyamideimide resin (PAI), polyesterimide resin, and polyesteramideimide resin, among which PI and PAI are preferable, and imide bond Alternatively, an aromatic polyimide resin or an aromatic polyamideimide resin in which an amide bond is bonded via an aromatic group is particularly preferable.

  PAI is a resin having an imide bond and an amide bond. Further, the imide bond of the aromatic polyamideimide resin may be a precursor such as polyamic acid, a closed imide ring, or a mixture of these. Such an aromatic polyamideimide resin is produced from an aromatic primary diamine (for example, diphenylmethanediamine) and an aromatic tribasic acid anhydride (for example, a mono- or diacyl halide derivative of trimet acid anhydride). And those produced from an aromatic diisocyanate compound (for example, diphenylmethane diisocyanate) and an aromatic tribasic acid anhydride. Furthermore, it is produced from an aromatic, aliphatic or alicyclic diisocyanate compound and an aromatic tetrabasic acid dianhydride and an aromatic tribasic acid anhydride as PAI having a higher ratio of imide bonds than amide bonds. Any PAI can be used.

  The fluororesin coating can be blended with other known compounding agents used for fluororesin coatings as other compounding agents. In particular, it is desirable to mix metal oxides such as graphite, molybdenum disulfide, iron oxide, titanium oxide, magnesium oxide, and aluminum oxide in order to improve the wear resistance of the coating.

  The fluororesin film is composed of 60 to 130 parts by weight of binder resin, 5 to 30 parts by weight of one or more solid lubricants selected from graphite, molybdenum disulfide and metal oxide with respect to 100 parts by weight of fluororesin. By comprising a thing, the adhesiveness with the wedge-shaped piece made from a sintered material which is a foundation | substrate, and the abrasion resistance of a film can be exhibited more favorably. When the binder resin is a small amount of less than 60 parts by weight with respect to 100 parts by weight of the fluororesin, the adhesiveness is lowered. In addition, if a small amount of less than 5 parts by weight of graphite, molybdenum disulfide, metal oxide or the like is added to 100 parts by weight of the fluororesin, the wear resistance is insufficient, and if it exceeds 30 parts by weight, the adhesiveness decreases. It is not preferable.

  Next, the low-friction sliding material provided on the friction-sliding contact surface of the wedge-shaped piece in the present invention is formed, for example, on a base material made of iron-based sintered metal via an intermediate layer, and the wedge-shaped piece base material and the low-friction sliding material are formed. It can be formed with increased adhesion strength with the moving material. The intermediate layer may be anything as long as fine irregularities are formed on the surface, but those formed by thermal spraying are preferable because the anchor effect is high without increasing the film thickness. .

  In particular, it is preferable to employ a metal sprayed layer made of a soft metal such as copper, nickel, and aluminum as the intermediate layer because the counterpart material is not damaged even when the low friction sliding material is worn.

  As another method, the low friction sliding material provided on the frictional sliding contact surface of the wedge-shaped piece according to the present invention is preferably subjected to shot blasting on the surface of a base material made of, for example, an iron-based sintered metal, and the “surface roughness” is preferably set. Can be provided with a rough surface of Ra 3 to 15 μm, more preferably Ra 5 to 10 μm, with a fluororesin film adhered thereon, to ensure the required performance and meet the demand for cost reduction. .

  As shown in FIG. 3, the bearing bush 10 used in the present invention only needs to have a sliding surface formed of a resin having sliding properties, and is well known by resin molding (integrated molding), composite molding, and the like. A multilayer bearing can be used, for example, a back metal 10a made of steel, copper, etc., and a porous sintered layer 10b made of a sintered compact such as a copper alloy powder formed thereon, A slidable resin composition in which the pores of the porous sintered layer 10b are partially filled, for example, a laminate comprising a resin layer 10c made of polytetrafluoroethylene resin containing 30 to 50% by weight of graphite powder. Can be used.

  It is also preferable to employ a metal sprayed layer made of a soft metal such as copper, nickel, or aluminum instead of the porous sintered layer 10b in the bearing bush 10 because the adhesion strength with the resin layer 10c is increased. . As described above, the bearing bush 10 is a resin having a sliding surface with a sliding property, and it is appropriate that the back metal is laminated and integrated through an intermediate layer (binder layer) having good adhesiveness with the resin.

  As a specific example of the slidable resin for forming the sliding surface, the same material as the low friction sliding material described above can be used.

  The seat reclining device configured as described above rotates the shaft 4 by a manual lever or the like when the differential transmission mechanism is operated to adjust the opening angle of the hinge connecting the seat surface portion and the backrest portion of the seat. As a result, the wedge-shaped pieces 6 and 6 ′ are slid and moved within the arc-shaped gap by being pushed by the cam 5 provided integrally with the shaft 4, so that the angle adjustment is possible or the angle is fixed. At the time of switching, the low-friction sliding material on the outer side surfaces 6b and 6'b of the wedge-shaped pieces 6 and 6 'is brought into sliding contact with the resin layer of the bearing bush 10 to act a differential transmission mechanism (taumel mechanism).

  At that time, the force to peel off the surface of the resin layer 10c of the bearing bush 10 is reduced by the contact between the resin sliding surface and the low friction sliding material. It becomes difficult to peel in a layer form from the middle layer, or from the intermediate layer (binder layer) or the back metal as the base material.

[Example 1]
In Example 1, a primer made of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA) and a polyimide resin was applied to the entire surface of a wedge-shaped piece base material formed of an iron-based sintered material and dried. Thereafter, a coating material (manufactured by NTN Precision Resin Co., Ltd .: BEAREE FE7090) containing PFA as a main component was spray-coated and then baked at about 350 ° C. to form a fluororesin film made of PFA having a thickness of 0.040 mm.

[Example 2]
In Example 2, a copper sprayed layer composed of 95% copper and 5% tin is formed on the surface of a wedge-shaped piece made of the same iron-based sintered material as in Example 1, and polytetrafluoroethylene (PTFE) is further formed on the entire surface. After spray coating a coating material (NTN Precision Resin Co., Ltd .: BEAREE FE7030) consisting of 100 parts by weight and 90 parts by weight of polyamideimide resin as a binder resin, it is made of PTFE having a thickness of 0.025 mm by baking at about 230 ° C. A fluororesin film was formed.

Example 3
In Example 3, a nickel sprayed layer is formed on the surface of a wedge-shaped piece made of the same iron-based sintered material as in Example 1, and further 100 parts by weight of polytetrafluoroethylene (PTFE) is formed on the entire surface. Polyamideimide is used as a binder resin. Fluorine resin made of PTFE with a thickness of 0.025 mm after spray coating a coating material (NTN Precision Resin Co., Ltd .: BEAREE RCB) consisting of 100 parts by weight of graphite and 20 parts by weight of graphite as a compounding agent A film was formed.

[Comparative Example 1]
In Comparative Example 1, the surface of a wedge-shaped piece made of the same iron-based sintered material as in Example 1 was polished to finish the surface.

  In the first and second embodiments in which the wedge-shaped pieces obtained in this way are assembled in the seat reclining device shown in FIGS. 1 and 2, the wedge-shaped pieces 6 and 6 'are provided on the shaft of the internal gear by rotating the operation lever. When it was pushed by the cam, the outer gear 2 was able to move away from the inner gear quickly and the opening angle of the hinge could be adjusted smoothly.

  As a durability test, the wedge-shaped piece was assembled in the reclining device shown in FIGS. 1 and 2 and applied with a load of 20 kgf at a point 300 mm from the center of the bearing, reciprocating 7000 cycles under conditions of an operating angle of 30 ° and an operating speed of 2 ° / sec. The test was conducted.

  The bearing bush 10 was coated with a coating material (NTN Precision Resin Co., Ltd .: BEAREE FL7075) mainly composed of polytetrafluoroethylene (PTFE) via a copper tin alloy sprayed layer on a back metal made of an iron-based steel plate. Is.

  As a result of the durability test, in Examples 1, 2, and 3, wear was observed in the fluororesin film of the wedge-shaped piece and the resin layer of the bearing bush, but peeling of the resin layer of the bearing bush and an increase in torque did not occur. In Comparative Example 1, the test was interrupted by abnormal torque after about 5500 cycles. When the bearing bush was confirmed, the resin layer was worn and peeled off.

Partially cutaway sectional view of a reclining device of an embodiment Perspective view of wedge-shaped piece Enlarged sectional view of bearing bush Partially cutaway cross-sectional view of the main part of a conventional reclining device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal gear 2 External gear 3 Shaft hole 4 Shaft 5 Cam 6, 6 ', 16, 16' Wedge-shaped piece 6a, 6'a Tapered end part 6c Inner side surface 6d Tip surface 6e Spring holding recessed part 6f Front (back) surface 7 Compression coil springs 10, 11 Bearing bush 10a Back metal 10b Porous sintered layer 10c Resin layer 11a Projection

Claims (9)

A differential transmission mechanism is provided to adjust the opening angle of the hinge that connects the seat surface part and the backrest part of the seat, and this differential transmission mechanism meshes the internal gear with the external gear with fewer teeth. A pair of wedge-shaped pieces are arranged in an arc-shaped gap formed between the shaft hole of the external gear and the shaft of the internal gear so that their tapered ends are opposite to each other, and the directions in which both wedge-shaped pieces are separated from each other When the wedge-shaped piece is pushed by the cam provided on the shaft of the internal gear and slides and moves in the arc-shaped gap, the external gear is separated from the internal gear and the hinge opening angle is provided. In the reclining device of the seat that can be adjusted,
A bearing bush having a sliding surface made of resin is fixedly provided in a shaft hole of the external gear, and the frictional sliding contact surface of the wedge-shaped piece is formed of a low friction sliding material. Reclining device.   The seat reclining device according to claim 1, wherein the frictional sliding contact surface of the wedge-shaped piece is formed by laminating and integrating a low-friction sliding material on a base material via an intermediate layer.   The seat reclining device according to claim 2, wherein the intermediate layer is a metal sprayed layer.   The seat reclining device according to claim 1 or 2, wherein the low-friction sliding material is made of a resin and is formed into a film.   The seat reclining device according to claim 4, wherein the resin is a fluororesin.   The seat reclining device according to claim 5, wherein the fluororesin is a fluororesin composition in which a fluororesin is added to a binder resin.   The seat reclining device according to claim 6, wherein the fluororesin composition is a fluororesin composition containing one or more solid lubricants selected from graphite, molybdenum disulfide, and metal oxides.   The fluororesin composition contains 60 to 130 parts by weight of binder resin with respect to 100 parts by weight of fluororesin, and 5 to 30 parts by weight of one or more solid lubricants selected from graphite, molybdenum disulfide, and metal oxides. The seat reclining device according to claim 7, which is a blended fluororesin composition.   The seat reclining device according to any one of claims 1 to 8, wherein the seat is an automobile seat.

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