JP2024081799A - Vehicle seat - Google Patents

Abstract

To provide a vehicle seat that can effectively receive a load acting on a seat belt from a vehicle occupant.SOLUTION: In a vehicle seat, a side frame 30R on the side where a shoulder anchor part is located includes an inside plate 36 constituting the inside in its seat width direction, an outside plate 38 constituting the outside in the seat width direction of the side frame, and fastening parts 40a, 40b fastening the inside plate and the outside plate to each other so as to form a closed cross-sectional shape. A reinforcement part 44 formed in the side frame has an inside front protrusion part 46 and central protrusion parts 48, 50, the central protrusion parts being formed so that a width dimension thereof along the longitudinal direction of a seat back frame increases from the upper end of the side frame toward the lower end.SELECTED DRAWING: Figure 4

Description

The present invention relates to a vehicle seat in which a shoulder anchor portion through which a seat belt passes is provided at one end of a seat back frame in the seat width direction.

For example, Patent Document 1 discloses a vehicle seat in which the side frame located below the 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 the occupant during a vehicle collision or the like acts from the rear corner of the side frame on the outer side in the seat width direction toward the front corner on the inner side in the seat width direction.

Patent No. 5599625

The present invention was made in relation to the above-mentioned conventional technology, and aims to provide a vehicle seat that can effectively receive the load applied to the seat belt by the occupant.

In order to achieve the above object, the vehicle seat according to the present invention is a vehicle seat provided with a shoulder anchor portion through which a seat belt is inserted at one end side of a seat back frame in the seat width direction, and a side frame that constitutes the seat back frame and is located at the one end side in the seat width direction has an inner plate that constitutes the inner side of the side frame in the seat width direction, an outer plate that constitutes the outer side of the side frame in the seat width direction, and a fixing portion that fixes the inner plate and the outer plate to each other so as to form a closed cross-sectional shape, and the side frame is formed with a reinforcing portion that protrudes from the inner surface to the outer surface, and the reinforcing portion has an inner front convex portion provided at a front corner portion of the inner plate and a central convex portion provided at the front-rear center portion of at least one of the inner plate and the outer plate, and the central convex portion is formed so that the width dimension along the front-rear direction of the seat back frame increases from the upper end to the lower end of the side frame.

With this configuration, the strength and rigidity of the front corner of the inner plate, where the load from the seat belt acts, can be improved by the inner front convex portion. This allows the side frame to effectively bear the load acting on the seat belt from the occupant. In addition, the strength and rigidity of the side frame can be improved while reducing its weight. Furthermore, the strength and rigidity can be improved toward the lower end of the side frame.

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

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

A preferred embodiment of the vehicle seat according to the present invention will be described below with reference to the attached drawings. In each drawing, 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", the front of the vehicle seat is indicated by an arrow "Fr", and the rear of the vehicle seat is indicated by an arrow "Rr" according to the direction seen by a seated occupant.

As shown in FIG. 1, the vehicle seat 10 is configured as a seat belt-integrated seat with an integrated seat belt 18. In such a vehicle seat 10, as shown in FIG. 4, in the event of a vehicle collision or the like, a load F acts from the occupant via the seat belt 18 on the side frame 30R constituting the seat back frame 24. That is, the load F acts on the side frame 30R diagonally from the rear outside to the front inside along the arrow. Therefore, the side frame 30R has sufficient strength and rigidity to be able to withstand such a load F.

As shown in FIG. 1, a vehicle seat 10 includes a seat cushion 12, a seat back 14, a headrest 16, and a seat belt 18. The seat cushion 12 supports the buttocks and thighs of an 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 front-to-rear direction of the seat. The headrest 16 supports the head of the occupant and is provided at the upper end of the seat back 14 so as to be adjustable up and down. The seat belt 18 is a so-called three-point seat belt, and is capable of restraining the occupant's shoulder (right shoulder) and waist with a single belt.

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

The seat back 14 includes a seat back frame 24, a pressure-receiving member 26, and a shoulder anchor portion 28. The seat back frame 24 forms the framework of the seat back 14 and includes a pair of left and right side frames 30L, 30R, a lower frame 32, and an upper frame 34.

The side frame 30R is located at one end of the seatback frame 24 in the seat width direction, and the side frame 30L is located at the other end of the seatback frame 24 in the seat width direction. The lower end of each side frame 30L, 30R (the end on the seat cushion frame 20 side) is connected to the rear end of the seat cushion frame 20 so as to be tiltable in the seat front-rear direction. The lower ends of the pair of left and right side frames 30L, 30R are connected to each other by a lower frame 32. The upper ends of the pair of left and right side frames 30L, 30R (the end on the opposite side to the seat cushion frame 20) are connected to each other by an upper frame 34. That is, the seatback frame 24 is formed in a rectangular ring shape when viewed from the front.

The pressure-receiving member 26 is located between the lower frame 32 and the upper frame 34, and connects the pair of left and right side frames 30L, 30R. A plurality of pressure-receiving members 26 are provided at equal intervals in the vertical direction of the seatback frame 24. In the example shown in FIG. 2, the pressure-receiving member 26 is configured as an S-spring. However, the pressure-receiving member 26 is not limited to an S-spring, and may be any structure, such as a plate-shaped member, that 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 of the upper frame 34 (one end of the seat back frame 24 in the seat width direction) by welding or the like. In other words, the shoulder anchor portion 28 is located above the right side frame 30R. The shoulder anchor portion 28 may also be fixed directly to the right side frame 30R by welding or the like.

As shown in Figures 2 to 3B, the side frame 30R located below the shoulder anchor portion 28 extends linearly. The width dimension of the side frame 30R (the dimension along the front-rear direction of the seatback frame 24) gradually increases from the upper end to the lower end of the side frame 30R.

Specifically, as shown in Figures 3A and 3B, the outer shape of the side frame 30R is configured to be symmetrical in a side view of the seatback frame 24. In other words, the side frame 30R is formed in a substantially trapezoidal shape in a side view of the seatback frame 24. This allows the section modulus of the side frame 30R to increase linearly from the upper end to the lower end. The side frame 30R may also be formed in an isosceles triangle shape in a side view of the seatback frame 24.

As shown in FIG. 4, the side frame 30R has an inner plate 36 that defines the seat width direction inner side of the side frame 30R (the direction of the arrow L in FIG. 4), and an outer plate 38 that defines the seat width direction outer side of the side frame 30R (the direction of the arrow R in FIG. 4).

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

The inner plate 36 is integrally formed by pressing a metal plate. The metal plate is made of a metal material such as carbon steel, steel, or an aluminum alloy.

The outer plate 38 includes an outer plate body 38a extending in the front-rear direction of the seatback 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 an outer rear end portion 38c extending inward in the seat width direction from the rear end of the outer plate body 38a.

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

The outer plate 38 is integrally formed by pressing a metal plate. The metal plate is made of a metal material such as carbon steel, steel, or an aluminum alloy.

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 body 36a faces the outer plate body 38a at a distance.

The side frame 30R has a first overlapping portion 42a in which the inner front end 36b and the outer front end 38b are fixed by the first fixing portion 40a in a state in which they are overlapped with each other in the fore-and-aft direction of the seatback frame 24. In the first overlapping portion 42a, the inner front end 36b is located forward of the outer front end 38b.

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

The side frame 30R has a second overlapping portion 42b in which the inner rear end portion 36c and the outer rear end portion 38c are fixed by the second fixing portion 40b in a state in which they are overlapped with each other in the fore-and-aft direction of the seatback frame 24. In the second overlapping portion 42b, the inner rear end portion 36c is located forward of the outer rear end portion 38c.

Specifically, the outer surface of the inner rear end 36c contacts the inner surface of the outer rear end 38c. The overlap between the inner rear end 36c and the outer rear end 38c is approximately the same as the overlap between the inner front end 36b and the outer front end 38b. However, the overlap between the inner rear end 36c and the outer rear end 38c can be set arbitrarily and may be different from the overlap between the inner front end 36b and the outer front end 38b. The second fixing portion 40b is a weld bead. The first overlap portion 42a and the second overlap portion 42b are located in 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 has a reinforcing portion 44 that protrudes from its inner surface toward its outer surface. The reinforcing portion 44 includes an inner front protrusion 46, an inner central protrusion 48, an outer central protrusion 50, and an outer rear protrusion 52.

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

3B and 4, the outer central protrusion 50 protrudes outward in the seat width direction from the center of the outer plate 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 convex portion 52 is provided at the rear corner of the outer plate 38. In other words, the outer rear convex portion 52 is provided at the rear end portion 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 convex portion 52 has the same shape and size as the inner front convex portion 46.

As shown in Figures 3A to 4, 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 a cross section formed in an arc shape. Specifically, each of the inner front convex portion 46 and the outer rear convex portion 52 has a cross section formed in a semicircular shape.

3A and 3B, 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) extends linearly over the entire length of the side frame 30R. The width dimension (dimension along the front-to-rear direction of the seat back frame 24) of each of the inner front convex portion 46 and the outer rear convex portion 52 is constant over the entire length.

The width dimensions of the inner central protrusion 48 and the outer central protrusion 50 gradually increase from the upper end to the lower end of the side frame 30R in accordance with the outer shape of the side frame 30R. In other words, the inner central protrusion 48 and the outer central protrusion 50 are each formed in a substantially trapezoidal shape when viewed from the side in the seat width direction.

Side supports 54 are attached to the side frames 30R. Note that the side supports 54 are not shown in FIG. 2. The side supports 54 are for supporting the sides of the occupant and protrude further toward the front of the seat back 14 than the side frames 30R.

The side support 54 is fixed to the side frame 30R by two screw members 56. The two screw members 56 are arranged spaced apart from each other in the vertical direction of the seat back frame 24 (extension direction of the side support 54). However, the number of screw members 56 may be one or three or more. Each screw member 56 is provided so as to penetrate the inner plate body 36a in the seat width direction. Specifically, each screw member 56 is located between the inner front convex portion 46 and the inner central convex portion 48.

As shown in FIG. 5, an airbag 58 and two clips 60 are attached to the side frame 30R. Note that the airbag 58 and clips 60 are not shown in FIGS. 2 to 3B.

The airbag 58 is disposed on the outer side of the outer plate 38 in the seat width direction. The airbag 58 has an airbag body 62 that is folded so as to be able to deploy in the event of a vehicle collision, an inflator 64 that generates gas to deploy the airbag body 62, and a retainer 66 that supports the inflator 64.

The inflator 64 is provided with a bolt 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 fastened to fix the airbag 58 to the side frame 30R.

The first through hole 70 is located between the outer central convex portion 50 and the outer rear convex portion 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 is 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 convex portion 48.

As shown in Figures 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 78 is formed below the second through hole 72 in the inner plate 36. 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 relief holes to prevent a bolt (not shown) of the airbag 58 from interfering with the side frame 30R.

As shown in FIG. 5, the clip 60 is used to apply tension to the skin that constitutes the seat back 14, and has an extension 80 that is fixed to the end of the skin. Two clips 60 are attached to two fixing holes 82 formed in the outer plate body 38a. The clips 60 are fixed by attaching the locking claws 83 to the outer plate body 38a.

As shown in Figures 3A and 3B, the fixing hole 82 is located closer to the outer front end 38b than the outer central convex portion 50. The fixing hole 82 is at the same height as the first through hole 70. In other words, the fixing hole 82 is provided at a position on the opposite side of the outer central convex portion 50 from the first through hole 70.

Each fixing hole 82 is formed in a rectangular shape. Specifically, each fixing hole 82 extends along the up-down direction of the seatback frame 24. Two fixing holes 82 are spaced apart from each other in the up-down direction of the seatback frame 24.

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

In this case, the vehicle seat 10 according to this embodiment provides the following advantages:

The side frame 30R is formed with a reinforcing portion 44 that protrudes from the inner surface toward the outer surface, and the reinforcing portion 44 has an inner front convex portion 46 provided at the front corner of the inner plate 36. Therefore, the inner front convex portion 46 can improve the strength and rigidity of the front corner of the inner plate 36 where the load F from the seat belt 18 acts. This allows the load F acting on the seat belt 18 from the occupant to be effectively received by the side frame 30R.

The reinforcing portion 44 has an outer rear convex portion 52 provided at the rear corner of the outer plate 38. This allows the outer rear convex portion 52 to improve the strength and rigidity of the rear corner of the outer plate 38 where the load F from the seat belt 18 acts. This allows the load F acting on the seat belt 18 from the occupant to be more effectively received by the side frame 30R.

The reinforcing portion 44 has an inner central protrusion 48 provided in the center of the inner plate 36 in the fore-aft direction, and an outer central protrusion 50 provided in the center of the outer plate 38 in the fore-aft direction. This allows the strength and rigidity of the side frame 30R to be improved while reducing its weight.

The side frame 30R, the inner central protrusion 48, and the outer central protrusion 50 are each formed so that the width dimension along the front-rear direction of the seatback frame 24 increases from the upper end to the lower end of the side frame 30R. This allows the strength and rigidity to be improved toward the lower end of the side frame 30R.

The reinforcing parts 44 (the inner front convex part 46, the inner central convex part 48, the outer central convex part 50, and the outer rear convex part 52) extend linearly along the extension direction of the side frame 30R. This allows the strength and rigidity of the side frame 30R to be improved while reducing its weight.

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 arc-shaped cross section. This effectively increases the cross-sectional area of the reinforcing portion 44, improving its strength and rigidity.

The outer shape of the side frame 30R is symmetrical when viewed from the side of the seatback frame 24. Therefore, when a load F acts on the side frame 30R from the seat belt 18, the stress of the side frame 30R can be distributed in a well-balanced manner. In addition, parts can be standardized between the left and right side frames 30L, 30R. In other words, when the shoulder anchor portion 28 is fixed to the left end portion of the upper frame 34 (the other end side in the seat width direction of the seatback frame 24), a side frame 30L having a configuration similar to that of the side frame 30R can be used.

The side frame 30R is formed in a generally trapezoidal shape when viewed from the side of the seatback frame 24. This allows the weight of the side frame 30R to be reduced, while distributing the stress of the side frame 30R in a well-balanced manner when a load F acts on the side frame 30R from the seat belt 18.

The side frame 30R has a first overlapping portion 42a secured by a first fastening portion 40a with the inner front end portion 36b and the outer front end portion 38b overlapping each other in the fore-aft direction of the seatback frame 24. The side frame 30R also has a second overlapping portion 42b secured by a second fastening portion 40b with the inner rear end portion 36c and the outer rear end portion 38c overlapping each other in the fore-aft direction of the seatback frame 24. This improves the strength and rigidity of the portion where the inner plate 36 and the outer plate 38 are secured to each other.

In the first overlapping portion 42a, the inner front end 36b is located in front of the outer front end 38b, and in the second overlapping portion 42b, the inner rear end 36c is located in front of the outer rear end 38c. This improves the strength and rigidity against the load F acting on the side frame 30R from the seat belt 18.

The present invention is not limited to the above-mentioned configuration. The vehicle seat 10 may be provided with modified side frames 30Ra to 30Rf shown in Figures 6A to 6F instead of the side frame 30R. Note that in Figures 6A to 6F, the same components as the above-mentioned side frame 30R are given the same reference numerals, and detailed descriptions thereof are omitted. Furthermore, in the modified side frames 30Ra to 30Rf, the same components as the above-mentioned side frame 30R naturally provide the same functions and effects.

In the side frame 30Ra shown in FIG. 6A, the above-mentioned inner central convex portion 48, outer central convex portion 50, and outer rear convex portion 52 are omitted compared to the above-mentioned side frame 30R. In other words, the reinforcing portion 44a has the inner front convex portion 46. 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 convex portion 48 and the outer central convex portion 50 described above are omitted compared to 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. In this case, the inner plate 36 and the outer plate 38 have the same configuration, so that the number of parts can be reduced.

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

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

In this case, the strength and rigidity of the side frame 30Rc can be further improved while reducing the weight of the side frame 30Rc. Note that either the inner rear convex portion 84 or the outer front convex portion 86 may be omitted from the side frame 30Rc.

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

In the side frame 30Re shown in FIG. 6E, the inner central protrusion 48 and the outer central protrusion 50 are omitted compared to the side frame 30R described above. That is, the side frame 30Re has the same reinforcing portion 44b as in FIG. 6B. In addition, in the first overlapping portion 42a, the inner front end portion 36b is located rearward of the outer front end portion 38b, and the outer surface of the inner front end portion 36b is in contact with the inner surface of the outer front end portion 38b. In the second overlapping portion 42b, the inner rear end portion 36c is located forward 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 can be easily positioned by fitting the inner front end 36b and the inner rear end 36c between the outer front end 38b and the outer rear end 38c. This improves the manufacturing workability of the side frame 30Re.

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

The extension length of the inner front end 36b is shorter than the extension length of the inner rear end 36c. The extension length of the outer front end 38b is the same as the extension length of the inner rear end 36c and longer than the extension length of the outer rear end 38c. The extension length of the outer rear end 38c is the same as the extension length of the inner front end 36b. In other words, 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, 44a to 44d need only have at least the inner front convex portion 46. In other words, the reinforcing portions 44, 44a to 44d can have any combination of the inner central convex portion 48, the inner rear convex portion 84, the outer front convex portion 86, the outer central convex portion 50, and the outer rear convex portion 52. The inner central convex portion 48 and the outer central convex portion 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 into a polygonal shape (e.g., a triangular shape, a rectangular shape, etc.).

The present invention may be a vehicle seat 10A shown in FIG. 7. As shown in FIG. 7, the vehicle seat 10A has a side frame 30La (second side frame) configured similarly to the above-mentioned side frame 30R (first side frame) 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. Each shoulder anchor portion 28L, 28R is configured similarly to the above-mentioned shoulder anchor portion 28. A seat belt (a seat belt that restrains the left shoulder and waist of the occupant) different from the above-mentioned seat belt 18 is inserted into the shoulder anchor portion 28R.

The vehicle seat 10A shown in FIG. 7 can be applied to both ends of the rear seats in a vehicle where two or more seats are arranged in the seat width direction. This configuration allows the components of the side frames 30L, 30R to be shared and lightweight, resulting in a highly rigid and well-balanced seat frame. In FIG. 7, the side frame 30La may be configured in the same way as the side frames 30Ra to 30Rf described above.

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

10, 10A...vehicle seat 14...seat back 24...seat back frame 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...reinforcement portion 46...inner front convex portion 48...inner central convex portion 50...outer central convex portion 52...outer rear convex portion F...load acting on side frame from seat belt

Claims (1)

A vehicle seat having a shoulder anchor portion through which a seat belt is inserted, the shoulder anchor portion being provided on one end side of a seat back frame in a seat width direction,
A side frame that constitutes the seat back frame and is located at one end side in the seat width direction is
An inner plate that constitutes an inner side of the side frame in the seat width direction;
An outer plate that constitutes the outer side of the side frame in the seat width direction;
a fastening portion that fastens 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 to the outer surface,
The reinforcing portion is
an inner front convex portion provided at a front corner portion of the inner plate;
a central protrusion provided at a front-rear direction central portion of at least one of the inner plate and the outer plate,
The central protrusion is formed such that a width dimension along a front-rear direction of the seatback frame increases from an upper end to a lower end of the side frame.

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