JP2022116152A - Vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular seat that can effectively receive loads acting on a seat belt, through an occupant.

SOLUTION: In a vehicular seat, a side frame 30R at a side at which a shoulder anchor part is positioned comprises an inner plate 36 constituting an inside in a seat width direction thereof, an outer plate 38 constituting an outside in the seat width direction of the side frame 30R, and fastening parts 40a and 40b that fasten each other so that the inner plate 36 and the outer plate 38 are formed in closed cross sectional shapes. A reinforcement part 44 formed in the side frame 30R has an inner front convex portion 46, a center convex portion 48 and an outer front convex portion 50. The side frame 30R, the center convex portion 48 and the outer front convex portion 50 respectively are formed so that width dimensions along a longitudinal direction of a seat back frame gradually enlarge as going from an upper end of the side frame 30R toward a lower end thereof.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2022,JPO&INPIT

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat in which a shoulder anchor portion through which a seat belt is inserted is provided at one end of a seat back frame in the seat width direction.

For example, Patent Literature 1 discloses a vehicle seat in which a side frame positioned below a shoulder anchor portion is configured to have a rectangular closed cross-sectional shape. In such a vehicle seat, the load applied to the seat belt by an occupant in the event of a vehicle collision or the like acts from the rear corner portion on the outside in the seat width direction of the side frame toward the front corner portion on the inside in the seat width direction. .

Japanese Patent No. 5599625

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle seat that can effectively receive the load applied to the seat belt from the passenger.

To achieve the above object, a vehicle seat according to the present invention is a vehicle seat provided with a shoulder anchor portion through which a seat belt is inserted on one end side of a seat back frame in a seat width direction, the seat back frame comprising: The side frame positioned at one end in the seat width direction comprises an inner plate forming the inner side of the side frame in the seat width direction, an outer plate forming the outer side of the side frame in the seat width direction, and the inner plate. a fixing portion for fixing the outer plate to each other so as to form a closed cross-sectional shape, and the side frame is provided with a reinforcing portion protruding from the inner surface toward the outer surface, and the reinforcing portion extends from the inner side. an inner front convex portion provided at a front corner portion of a plate; and a central convex portion provided at a front-rear central portion of at least one of the inner plate and the outer plate; Each of the protrusions is formed such that a width dimension along the longitudinal direction of the seatback frame increases from the upper end to the lower end of the side frame.

According to such a configuration, the strength and rigidity of the front corner portion of the inner plate on which the load from the seat belt acts can be improved by the inner front convex portion. As a result, the load applied to the seat belt from the occupant can be effectively received by the side frames. Moreover, the strength and rigidity can be improved while reducing the weight of the side frame. Furthermore, the strength and rigidity can be improved toward the lower ends of the side frames.

To achieve the above object, a vehicle seat according to the present invention is a vehicle seat provided with a shoulder anchor portion through which a seat belt is inserted on one end side of a seat back frame in a seat width direction, the seat back frame comprising: The side frame positioned at one end in the seat width direction comprises an inner plate forming the inner side of the side frame in the seat width direction, an outer plate forming the outer side of the side frame in the seat width direction, and the inner plate. a fixing portion for fixing the outer plate to each other so as to form a closed cross-sectional shape, and the side frame is provided with a reinforcing portion protruding from the inner surface toward the outer surface, and the reinforcing portion extends from the inner side. an inner front protrusion provided at the front corner of the plate, an outer rear protrusion provided at the rear corner of the outer plate, and an outer central protrusion provided at the center of the outer plate in the front-rear direction; and an airbag is arranged on the outside of the outer plate in the seat width direction, and the airbag includes an airbag body that is folded so as to be deployable in the event of a vehicle collision, and gas for deploying the airbag body. and a retainer for supporting the inflator, the inflator is provided with bolts for attaching the airbag to the side frame, and the bolts are formed on the outer plate The airbag is fixed to the side frame by fastening a nut while being inserted into the first through hole and the second through hole formed in the inner plate. The through-hole is located at a position avoiding the reinforcing portion, and the retainer is in contact with the outer central convex portion.

In the above-described vehicle seat, each of the inner front projection and the outer rear projection has an arcuate cross section, and the reinforcing portion is an inner central projection positioned at the center of the inner plate in the front-rear direction. and a tangent line to the inner front convex portion and the inner central convex portion and a tangent line to the outer rear convex portion and the outer central convex portion may be parallel to each other.

With such a configuration, the cross-sectional area of the reinforcing portion can be efficiently increased to improve strength and rigidity.

In the above-described vehicle seat, the side frame has at least two overlapped portions in which the inner plate and the outer plate are overlapped with each other in the longitudinal direction of the seat back frame and fixed by the fixing portion. may be

With such a configuration, it is possible to improve the strength and rigidity of the portion where the inner plate and the outer plate are fixed to each other.

In the vehicle seat described above, each of the outer central protrusion and the outer rear protrusion has an arcuate cross section, and the radius of curvature of the outer central protrusion is the radius of curvature of the outer rear protrusion. may be greater than

In the vehicle seat described above, the bolt may protrude inward in the seat width direction from the inner central convex portion.

According to the present invention, since the strength and rigidity of the front corner portion of the inner plate where the load from the seat belt acts can be improved by the inner front convex portion, the load acting on the seat belt from the occupant can be reduced by the side frame. can be received as intended.

1 is a perspective view of a vehicle seat according to an embodiment of the invention; FIG. FIG. 2 is a perspective view showing a seat cushion frame and a seat back frame that constitute the vehicle seat of FIG. 1; 3A is a plan view of the right side frame viewed from the seat width direction inner side, and FIG. 3B is a plan view of the right side frame viewed from the seat width direction outer side. FIG. 3B is a cross-sectional view along line IV-IV of FIG. 3A; 3B is a cross-sectional view taken along line VV of FIG. 3A; FIG. 6A is a cross-sectional view of a side frame according to a first modified example, FIG. 6B is a cross-sectional view of a side frame according to a second modified example, and FIG. 6C is a cross-sectional view of a side frame according to a third modified example. 6D is a cross-sectional view of a side frame according to a fourth modification, FIG. 6E is a cross-sectional view of a side frame according to a fifth modification, and FIG. 6F is a side frame according to a sixth modification. 4 is a cross-sectional view of the frame; FIG. FIG. 11 is a perspective view of a vehicle seat according to a modified example;

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a vehicle seat according to the present invention will be described below with reference to the accompanying drawings. In each figure, the left side of the vehicle seat is indicated by an arrow "L", the right side of the vehicle seat is indicated by an arrow "R", and the front side of the vehicle seat is indicated by an arrow " Fr", and the rear of the vehicle seat is indicated by an arrow "Rr".

As shown in FIG. 1, the vehicle seat 10 is configured as a seat belt-integrated seat in which a seat belt 18 is integrally provided. In such a vehicle seat 10, as shown in FIG. 4, a load F acts from an occupant on the side frames 30R constituting the seat back frame 24 via the seat belt 18 at the time of a vehicle collision or the like. That is, the load F acts on the side frame 30R diagonally along the arrow from the outer rear to the inner front. Therefore, the side frame 30R has strength and rigidity that can sufficiently receive such a load F.

As shown in FIG. 1, the vehicle seat 10 includes a seat cushion 12, a seat back 14, a headrest 16 and a seat belt 18. As shown in FIG. The seat cushion 12 supports the buttocks and thighs of the occupant. The seat back 14 supports the back of the occupant, and is provided at the rear end of the seat cushion 12 so as to be tiltable in the seat longitudinal direction. The headrest 16 supports the head of the occupant and is provided at the upper end of the seatback 14 so as to be vertically adjustable. The seat belt 18 is a so-called three-point seat belt, and can restrain the shoulder (right shoulder) and waist of the occupant with one belt.

As shown in FIG. 2, the seat cushion 12 has a seat cushion frame 20 forming its skeleton. The seat cushion frame 20 is fixed to a vehicle body (not shown) via a pair of left and right rails 22L and 22R.

The seatback 14 includes a seatback frame 24 , a pressure receiving member 26 and shoulder anchor portions 28 . The seatback frame 24 forms the skeleton of the seatback 14 and has a pair of left and right side frames 30L, 30R, a lower frame 32 and an upper frame 34. As shown in FIG.

The side frame 30R is positioned on one end side of the seat back frame 24 in the seat width direction, and the side frame 30L is positioned on the other end side of the seat back frame 24 in the seat width direction. The lower ends of the side frames 30L and 30R (the ends on the side of the seat cushion frame 20) are connected to the rear end of the seat cushion frame 20 so as to be tiltable in the seat longitudinal direction. Lower ends of the pair of left and right side frames 30L and 30R are connected to each other by a lower frame 32. As shown in FIG. Upper ends of the pair of left and right side frames 30L and 30R (ends on the side opposite to the seat cushion frame 20) are connected to each other by an upper frame 34. As shown in FIG. In other words, the seatback frame 24 is formed in a quadrangular annular shape when viewed from the front.

The pressure receiving member 26 is positioned between the lower frame 32 and the upper frame 34 and connects the pair of left and right side frames 30L and 30R. A plurality of pressure receiving members 26 are provided at regular intervals in the vertical direction of the seatback frame 24 . In the example of FIG. 2, the pressure receiving member 26 is constructed as an S spring. However, the pressure-receiving member 26 is not limited to the S spring, and may be of any structure, such as a plate-like member, as long as it can support the occupant from behind.

The shoulder anchor portion 28 is for inserting the seat belt 18, and is fixed to the right end portion of the upper frame 34 (one end side of the seat back frame 24 in the seat width direction) by welding or the like. That is, the shoulder anchor portion 28 is positioned above the right side frame 30R. The shoulder anchor portion 28 may be fixed directly to the right side frame 30R by welding or the like.

As shown in FIGS. 2 to 3B, the side frame 30R positioned below the shoulder anchor portion 28 extends linearly. The width dimension of the side frame 30R (the dimension along the longitudinal direction of the seat back frame 24) gradually widens from the upper end to the lower end of the side frame 30R.

Specifically, as shown in FIGS. 3A and 3B, the outer shape of the side frame 30R is bilaterally symmetrical when the seatback frame 24 is viewed from the side. That is, the side frame 30R is formed in a substantially trapezoidal shape when the seatback frame 24 is viewed from the side. Thereby, the section modulus of the side frame 30R can be linearly increased from the upper end to the lower end. The side frame 30R may be formed in an isosceles triangle shape when the seatback frame 24 is viewed from the side.

As shown in FIG. 4, the side frame 30R includes an inner plate 36 forming the inner side of the side frame 30R in the seat width direction (the direction of arrow L in FIG. 4), and an outer side of the side frame 30R in the seat width direction (the direction of arrow R in FIG. 4). direction).

The inner plate 36 includes an inner plate body 36a extending in the longitudinal direction of the seat back frame 24, an inner front end portion 36b extending outward in the seat width direction from the front end of the inner plate body 36a, and a rear end of the inner plate body 36a. and an inner rear end portion 36c extending outward in the seat width direction from. The extension length of the inner front end portion 36b and the extension length of the inner rear end portion 36c are the same. However, the extension length of the inner front end portion 36b and the extension length of the inner rear end portion 36c may be different from each other.

The inner plate 36 is integrally formed by pressing a metal plate. A metal material such as carbon steel, steel, or an aluminum alloy is used for the metal plate, for example.

The outer plate 38 includes an outer plate body 38a extending in the longitudinal direction of the seat back frame 24, an outer front end portion 38b extending inward in the seat width direction from the front end of the outer plate body 38a, and a rear end of the outer plate body 38a. and an outer rear end portion 38c extending inward in the seat width direction from the .

The extension length of the outer front end portion 38b and the extension length of the outer rear end portion 38c are the same as each other, and are also the same as the extension length of the inner front end portion 36b and the extension length of the inner rear end portion 36c. However, the extension length of the outer front end portion 38b and the extension length of the outer rear end portion 38c may be different from each other. can be different.

The outer plate 38 is integrally formed by pressing a metal plate. A metal material such as carbon steel, steel, or an aluminum alloy is used for the metal plate, for example.

The outer plate 38 has the same cross-sectional shape as the inner plate 36 and is arranged point-symmetrically with respect to the inner plate 36 . The inner plate main body 36a faces the outer plate main body 38a with a space therebetween.

The side frame 30R has a first overlapping portion 42a in which the inner front end portion 36b and the outer front end portion 38b are overlapped with each other in the longitudinal direction of the seat back frame 24 and fixed by the first fixing portion 40a. In the first overlapping portion 42a, the inner front end portion 36b is located in front of the outer front end portion 38b.

Specifically, the inner surface of the inner front end portion 36b contacts the outer surface of the outer front end portion 38b. The overlap margin between the inner front end portion 36b and the outer front end portion 38b can be set arbitrarily. The first fixed portion 40a is a weld bead.

The side frame 30R has a second overlap portion 42b in which the inner rear end portion 36c and the outer rear end portion 38c are overlapped with each other in the longitudinal direction of the seatback frame 24 and fixed by the second fixing portion 40b. In the second overlapping portion 42b, the inner rear end portion 36c is positioned in front of the outer rear end portion 38c.

Specifically, the outer surface of the inner rear end portion 36c is in contact with the inner surface of the outer rear end portion 38c. The overlapping margin between the inner rear end portion 36c and the outer rear end portion 38c is substantially the same as the overlapping margin between the inner front end portion 36b and the outer front end portion 38b. However, the overlapping margin between the inner rear end portion 36c and the outer rear end portion 38c can be arbitrarily set, and may be different from the overlapping margin between the inner front end portion 36b and the outer front end portion 38b. The second fixed portion 40b is a weld bead. The first overlapped portion 42a and the second overlapped portion 42b are positioned at the center of the side frame 30R in the seat width direction.

The thickness of the inner plate 36 is approximately the same as the thickness of the outer plate 38 . However, the thickness of the inner plate 36 may be greater than the thickness of the outer plate 38 . In this case, the strength and rigidity of the inner plate 36 can be improved.

The side frame 30R is formed with a reinforcing portion 44 protruding from the inner surface toward the outer surface. The reinforcing portion 44 includes an inner front protrusion 46 , an inner center protrusion 48 , an outer center protrusion 50 and an outer rear protrusion 52 .

In FIGS. 3A and 4 , the inner forward protrusion 46 is provided at the front corner of the inner plate 36 . In other words, the inner front protrusion 46 is provided at the front end of the inner plate main body 36a. The inner front convex portion 46 protrudes inward in the seat width direction from the inner plate main body 36a. The inner central protrusion 48 protrudes inward in the seat width direction from the front-rear center of the inner plate main body 36a.

3B and 4, the outer center protrusion 50 protrudes outward in the seat width direction from the center of the outer plate main body 38a in the front-rear direction. The outer central protrusion 50 has the same shape and size as the inner central protrusion 48 .

The outer rear protrusion 52 is provided at the rear corner of the outer plate 38 . In other words, the outer rear protrusion 52 is provided at the rear end of the outer plate main body 38a. The outer rear convex portion 52 protrudes outward in the seat width direction from the outer plate main body 38a. The outer rear protrusion 52 has the same shape and size as the inner front protrusion 46 .

As shown in FIGS. 3A to 4, the reinforcing portion 44 (the inner front protrusion 46, the inner central protrusion 48, the outer central protrusion 50, and the outer rear protrusion 52) has an arcuate cross section. . Specifically, each of the inner front protrusion 46 and the outer rear protrusion 52 has a semicircular cross section.

3A and 3B, the reinforcing portion 44 (inner front protrusion 46, inner central protrusion 48, outer central protrusion 50, and outer rear protrusion 52) extends linearly over the entire length of the side frame 30R. is doing. The width dimension of each of the inner front protrusion 46 and the outer rear protrusion 52 (the dimension along the front-rear direction of the seat back frame 24) is formed constant over the entire length.

The width dimension of each of the inner central convex portion 48 and the outer central convex portion 50 gradually widens from the upper end to the lower end of the side frame 30R corresponding to the outer shape of the side frame 30R. That is, each of the inner central convex portion 48 and the outer central convex portion 50 is formed in a substantially trapezoidal shape when viewed from the side in the seat width direction.

A side support 54 is attached to the side frame 30R. 2, illustration of the side support 54 is omitted. The side supports 54 are for supporting the sides of the occupant, and protrude toward the front side of the seat back 14 beyond the side frames 30R.

The side support 54 is fixed by two screw members 56 to the side frame 30R. The two screw members 56 are arranged side by side in the vertical direction of the seatback frame 24 (extending direction of the side supports 54) while being spaced apart from each other. However, the number of screw members 56 may be one or three or more. Each screw member 56 is provided so as to pass through the inner plate main body 36a in the seat width direction. Specifically, each screw member 56 is positioned between the inner front protrusion 46 and the inner central protrusion 48 .

Also, as shown in FIG. 5, an airbag 58 and two clips 60 are attached to the side frame 30R. 2 to 3B, illustration of the airbag 58 and the clip 60 is omitted.

The airbag 58 is arranged outside the outer plate 38 in the seat width direction. The airbag 58 has an airbag body 62 that is folded to deploy in the event of a vehicle collision, an inflator 64 for generating gas for deploying the airbag body 62, and a retainer 66 that supports the inflator 64. ing.

The inflator 64 is provided with bolts 68 for attaching the airbag 58 to the side frame 30R. The bolt 68 is inserted through a first through hole 70 formed in the outer plate body 38a and a second through hole 72 formed in the inner plate body 36a, and a nut 74 is tightened to attach the airbag 58. It is fixed to the side frame 30R.

The first through-hole 70 is positioned between the outer central protrusion 50 and the outer rear protrusion 52 . The first through hole 70 and the second through hole 72 face each other in the seat width direction. The second through hole 72 has the same size as the first through hole 70 . The second through hole 72 is located closer to the inner rear end portion 36c than the inner central protrusion 48 is.

As shown in FIGS. 3A and 3B, a third through hole 76 is formed below the first through hole 70 in the outer plate 38, and a fourth through hole 76 is formed below the second through hole 72 in the inner plate 36. As shown in FIGS. A hole 78 is formed. The third through hole 76 and the fourth through hole 78 face each other in the seat width direction. The third through-hole 76 and the fourth through-hole 78 are bolt escape holes for avoiding interference of bolts (not shown) of the airbag 58 with the side frame 30R.

As shown in FIG. 5, the clip 60 is for applying tension to the skin that constitutes the seat back 14, and has an extending portion 80 that is engaged with the edge of the skin. The two clips 60 are attached respectively to two fixing holes 82 formed in the outer plate body 38a. The clip 60 is fixed by attaching the locking claw 83 to the outer plate main body 38a.

As shown in FIGS. 3A and 3B, the fixing hole 82 is located closer to the outer front end portion 38b than the outer central convex portion 50 is. The fixing hole 82 is positioned at the same height as the first through hole 70 . In other words, the fixing hole 82 is provided at a portion opposite to the first through hole 70 with the outer central protrusion 50 interposed therebetween.

Each fixing hole 82 is formed in a rectangular shape. Specifically, each fixing hole 82 extends along the vertical direction of the seat back frame 24 . The two fixing holes 82 are arranged apart from each other in the vertical direction of the seatback frame 24 .

In such a vehicle seat 10, a load is applied to the seat belt 18 by an occupant in the event of a vehicle collision or the like. Then, a load F in the direction of the arrow in FIG. 4 acts on the side frame 30R. That is, the load F acts on the side frame 30R diagonally from the outer rear convex portion 52 toward the inner front convex portion 46 .

In this case, the vehicle seat 10 according to this embodiment has the following effects.

The side frame 30</b>R is formed with a reinforcing portion 44 protruding from the inner surface toward the outer surface. Therefore, the strength and rigidity of the front corner portion of the inner plate 36 on which the load F from the seat belt 18 acts can be improved by the inner front convex portion 46 . As a result, the load F acting on the seat belt 18 from the occupant can be effectively received by the side frames 30R.

The reinforcing portion 44 has an outer rear protrusion 52 provided at the rear corner of the outer plate 38 . As a result, the strength and rigidity of the rear corner portion of the outer plate 38 on which the load F from the seat belt 18 acts can be improved by the outer rear convex portion 52 . As a result, the load F acting on the seat belt 18 from the occupant can be more effectively received by the side frames 30R.

The reinforcing portion 44 has an inner central protrusion 48 provided at the center of the inner plate 36 in the front-rear direction, and an outer center protrusion 50 provided at the center of the outer plate 38 in the front-rear direction. Therefore, the strength and rigidity can be improved while reducing the weight of the side frame 30R.

Each of the side frames 30R, the inner central protrusion 48, and the outer central protrusion 50 is formed such that the width dimension along the longitudinal direction of the seatback frame 24 increases from the upper end to the lower end of the side frame 30R. . Thereby, the strength and rigidity can be improved toward the lower end of the side frame 30R.

The reinforcing portion 44 (the inner front protrusion 46, the inner center protrusion 48, the outer center protrusion 50, and the outer rear protrusion 52) extends linearly along the extending direction of the side frame 30R. Therefore, the strength and rigidity can be improved while reducing the weight of the side frame 30R.

The reinforcing portion 44 (the inner front convex portion 46, the inner central convex portion 48, the outer central convex portion 50, and the outer rear convex portion 52) has an arcuate cross section. As a result, the cross-sectional area of the reinforcing portion 44 can be efficiently increased to improve strength and rigidity.

The outer shape of the side frame 30R is bilaterally symmetrical when the seat back frame 24 is viewed from the side. Therefore, when the load F acts on the side frame 30R from the seat belt 18, the stress of the side frame 30R can be dispersed in a well-balanced manner. In addition, parts can be shared between the left and right side frames 30L and 30R. That is, when fixing the shoulder anchor portion 28 to the left end of the upper frame 34 (the other end of the seat back frame 24 in the seat width direction), the side frame 30L having the same configuration as the side frame 30R can be used.

The side frame 30R is formed in a substantially trapezoidal shape when the seat back frame 24 is viewed from the side. As a result, the weight of the side frame 30R can be reduced, and the stress of the side frame 30R can be distributed in a well-balanced manner when the load F acts on the side frame 30R from the seat belt 18.

The side frame 30R has a first overlapping portion 42a in which the inner front end portion 36b and the outer front end portion 38b are overlapped with each other in the longitudinal direction of the seat back frame 24 and fixed by the first fixing portion 40a. The side frame 30R also has a second overlapping portion 42b in which the inner rear end portion 36c and the outer rear end portion 38c are overlapped with each other in the longitudinal direction of the seat back frame 24 and fixed by the second fixing portion 40b. . Thereby, the strength and rigidity of the portion where the inner plate 36 and the outer plate 38 are fixed to each other can be improved.

The inner front end portion 36b of the first overlapped portion 42a is positioned forward of the outer front end portion 38b, and the inner rear end portion 36c of the second overlapped portion 42b is positioned forward of the outer rear end portion 38c. Thereby, the strength and rigidity can be improved with respect to the load F acting from the seat belt 18 to the side frame 30R.

The invention is not limited to the configurations described above. The vehicle seat 10 may include side frames 30Ra to 30Rf according to modifications shown in FIGS. 6A to 6F instead of the side frame 30R. 6A to 6F, the same components as those of the side frame 30R described above are denoted by the same reference numerals, and detailed description thereof will be omitted. Further, in the side frames 30Ra to 30Rf according to the modified examples, the same configuration as the side frame 30R described above has the same effect as that of the side frame 30R.

In the side frame 30Ra shown in FIG. 6A, the inner central protrusion 48, the outer central protrusion 50, and the outer rear protrusion 52 are omitted as compared with the side frame 30R described above. That is, the reinforcing portion 44a has an inner front convex portion 46. As shown in FIG. In this case, the configuration of the side frame 30Ra can be simplified.

In the side frame 30Rb shown in FIG. 6B, the inner central protrusion 48 and the outer central protrusion 50 are omitted, as compared with the side frame 30R described above. That is, the reinforcing portion 44b has an inner front convex portion 46 and an outer rear convex portion 52. As shown in FIG. In this case, since the inner plate 36 and the outer plate 38 have the same structure, the number of parts can be reduced.

In the side frame 30Rc shown in FIG. 6C, compared with the side frame 30R described above, the reinforcing portion 44c has the inner rear convex portion 84 provided at the rear corner of the inner plate 36 and the front corner of the outer plate 38. and an outer forward projection 86 provided.

In other words, the inner rear protrusion 84 is provided at the rear end of the inner plate main body 36a. The inner rear convex portion 84 protrudes inward in the seat width direction from the inner plate main body 36a. The outer front protrusion 86 is provided at the front end of the outer plate main body 38a. The outer front convex portion 86 protrudes outward in the seat width direction from the outer plate main body 38a.

In this case, the strength and rigidity can be further improved while reducing the weight of the side frame 30Rc. In the side frame 30Rc, either one of the inner rear protrusion 84 and the outer front protrusion 86 may be omitted.

In the side frame 30Rd shown in FIG. 6D, the inner rear chamfered portion 88 is formed at the rear corner of the inner plate 36 and the outer front chamfer is formed at the front corner of the outer plate 38, compared with the side frame 30R described above. A portion 90 is formed. In this case, the weight of the side frame 30Rd can be reduced. In the side frame 30Rd, either one of the inner rear chamfered portion 88 and the outer front chamfered portion 90 may be omitted.

In the side frame 30Re shown in FIG. 6E, the inner central convex portion 48 and the outer central convex portion 50 are omitted as compared with the side frame 30R described above. That is, the side frame 30Re has a reinforcing portion 44b similar to that shown in FIG. 6B. In addition, in the first overlapping portion 42a, the inner front end portion 36b is located behind the outer front end portion 38b, and the outer surface of the inner front end portion 36b contacts the inner surface of the outer front end portion 38b. In the second overlapping portion 42b, the inner rear end portion 36c is located in front of the outer rear end portion 38c, and the outer surface of the inner rear end portion 36c is in contact with the inner surface of the outer rear end portion 38c.

In this case, when manufacturing the side frame 30Re, the inner plate 36 and the outer plate 38 are separated by fitting the inner front end portion 36b and the inner rear end portion 36c between the outer front end portion 38b and the outer rear end portion 38c. Positioning can be easily performed. Therefore, the workability of manufacturing the side frame 30Re can be improved.

In the side frame 30Rf shown in FIG. 6F, the inner central protrusion 48 and the outer central protrusion 50 are omitted compared to the side frame 30R described above. In addition to the inner front projection 46 and the outer rear projection 52, the reinforcing portion 44d has an inner rear projection 84 and an outer front projection 86 similar to those shown in FIG. 6C.

The extension length of the inner front end portion 36b is shorter than the extension length of the inner rear end portion 36c. The extension length of the outer front end portion 38b is the same as the extension length of the inner rear end portion 36c and longer than the extension length of the outer rear end portion 38c. The extension length of the outer rear end portion 38c is the same as the extension length of the inner front end portion 36b. That is, the inner plate 36 and the outer plate 38 have the same configuration. The first overlapping portion 42a is located inside the center of the side frame 30Rf in the seat width direction. The second overlapping portion 42b is located outside the center of the side frame 30Rf in the seat width direction.

In the vehicle seat 10 described above, the reinforcing portions 44 , 44 a to 44 d only need to have at least the inner front protrusion 46 . That is, the reinforcing portions 44, 44a-44d can have any combination of the inner central protrusion 48, the inner rear protrusion 84, the outer front protrusion 86, the outer central protrusion 50, and the outer rear protrusion 52. The inner central projection 48 and the outer central projection 50 may extend with a constant width dimension over their entire length. The cross section of the reinforcing portions 44, 44a to 44d is not limited to an arc shape, and may be formed in a polygonal shape (eg, triangular, quadrangular, etc.).

The present invention may be a vehicle seat 10A shown in FIG. As shown in FIG. 7, the vehicle seat 10A has a side frame 30La (second side frame) configured similarly to the side frame 30R (first side frame) described above instead of the side frame 30L. . In this case, a shoulder anchor portion 28R (first shoulder anchor portion) is provided on one end side of the seat back frame 24 in the seat width direction, and a shoulder anchor portion 28L (second shoulder anchor portion) is provided on the other end side of the seat back frame 24 in the seat width direction. part) is provided. Each of the shoulder anchor portions 28L, 28R is configured similarly to the shoulder anchor portion 28 described above. A seat belt (a seat belt that restrains the left shoulder and waist of the occupant) different from the seat belt 18 described above is inserted through the shoulder anchor portion 28R.

A vehicle seat 10A as shown in FIG. 7 can be applied to seats at both ends in the seat width direction in a rear seat of a vehicle in which two or more seats are arranged in the seat width direction. According to such a configuration, it is possible to share the parts of the side frames 30L and 30R, reduce the weight, and obtain a highly rigid and well-balanced seat frame. In FIG. 7, the side frame 30La may be configured similarly to the side frames 30Ra to 30Rf described above.

The vehicle seat according to the present invention is not limited to the above-described embodiment, and can of course adopt various configurations without departing from the gist of the present invention.

Reference Signs List 10, 10A Vehicle seat 14 Seatback 24 Seatback frames 30L, 30La, 30R, 30Ra to 30Rf Side frame 36 Inner plate 38 Outer plate 40a First fixing portion 40b Second fixing portion 44, 44a to 44d... Reinforcing part 46... Inner front convex part 48... Inner central convex part 50... Outer central convex part 52... Outer rear convex part F... Load acting on the side frame from the seat belt

Claims (1)

A vehicle seat provided with a shoulder anchor portion through which a seat belt is inserted on one end side in the seat width direction of a seat back frame,
A side frame that constitutes the seat back frame and is positioned at one end in the seat width direction,
an inner plate forming the inner side of the side frame in the seat width direction;
an outer plate forming the seat width direction outer side of the side frame;
a fixing portion for fixing the inner plate and the outer plate to each other so as to form a closed cross-sectional shape;
The side frame is formed with a reinforcing portion protruding from the inner surface toward the outer surface,
The reinforcing portion is
an inner front protrusion provided at a front corner of the inner plate;
a central convex portion provided in the front-rear direction central portion of at least one of the inner plate and the outer plate;
Each of the side frames and the central protrusion is formed such that a width dimension along the front-rear direction of the seat back frame increases from an upper end to a lower end of the side frame.
A vehicle seat characterized by:

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