JP6817907B2 - Vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat, and more particularly to a vehicle seat capable of suppressing buckling of a side frame between a reinforcing plate and a panel member while reducing the weight.

Conventionally, there is a vehicle seat provided with a side frame that connects the seat back frame to the seat cushion frame in a rotatable state (Patent Document 1). According to the vehicle seat disclosed in Patent Document 1, the rigidity of the side frame is ensured by the plate-shaped reinforcing plate arranged around the connecting portion of the seat back frame, and the load from the rear of the vehicle (for example, It is possible to prevent the side frame from buckling in a predetermined region when a force for pressing the seat back frame to the back side due to a force that another vehicle collides with from the rear) is input to the side frame (Patent Document 1).

Japanese Unexamined Patent Publication No. 2001-130296 (paragraph 0014, FIG. 2, etc.)

However, in the conventional vehicle seat described above, the side frame may buckle in the region where the reinforcing plate is not arranged. If the reinforcing plate is set to a size that overlaps the entire buckling part of the side frame in order to suppress the buckling of the side frame, there is a problem that the weight of the vehicle seat cannot be reduced because the reinforcing plate becomes large. is there.

On the other hand, as a result of diligent studies to solve the above-mentioned problems, the applicant of the present application welds the panel member along the edge of the side frame below the connecting portion between the side frame and the seat back frame. , I came up with a configuration that suppresses buckling of the side frame at the portion where the reinforcing plate is not arranged (not known at the time of filing the application).

However, in this vehicle seat, when a force that presses the seat back frame toward the back side due to a load from the rear of the vehicle (for example, a force that another vehicle collides with from the rear) is input to the side frame, the reinforcing plate is formed. A new problem was found in which the side frame buckled with the panel member.

The present invention has been made to solve the above-mentioned problems, and to provide a vehicle seat capable of suppressing buckling of a side frame between a reinforcing plate and a panel member while reducing the weight. It is an object.

In order to achieve this object, the vehicle seat of the present invention includes a seat cushion frame forming the skeleton of the seat cushion and a seat back frame forming the skeleton of the seat back, and the seat cushion frame is a seat back. A pair of side frames that connect the frames in a rotatable state, a reinforcing plate that is welded to the pair of side frames, and a panel member whose both ends are welded to the edges of the pair of side frames, respectively, are provided and reinforced. The plate includes a main body portion arranged around the connecting portion of the side frame and the seat back frame, and a protruding portion protruding downward in the direction of gravity from a part of the main body portion, and the panel members are paired. It is formed in a plate shape thinner than the plate thickness of the side frame, is arranged below the main body in the direction of gravity, and the protruding portion is located below the panel member in the direction of gravity and is welded to the side frame.

According to the vehicle seat according to claim 1, the seat cushion frame includes a pair of side frames that connect the seat back frames in a rotatable state, a reinforcing plate welded to the pair of side frames, and a pair of both ends. A panel member welded to the edge of the side frame is provided, and the reinforcing plate is subjected to gravity from the main body portion arranged around the connecting portion of the side frame and the seat back frame and a part of the main body portion. The panel member is formed in a plate shape thinner than the plate thickness of the pair of side frames, and is arranged below the main body portion in the direction of gravity, and the protruding portion is provided with a projecting portion projecting downward in the direction. Since it is projected over between the panel member and the main body in the direction of gravity and welded to the side frame, the rigidity of the side frame between the reinforcing plate and the panel member can be ensured by the protruding portion. Therefore, there is an effect that the side frame can be suppressed from buckling between the reinforcing plate and the panel member due to the force at the time of collision of another vehicle from the rear.

Further, since the panel member is set to a plate thickness thinner than the plate thickness of the side frame and the protruding portion is projected from a part of the main body portion, it is possible to prevent the weight of the vehicle seat from increasing. That is, there is an effect that the weight of the vehicle seat can be reduced.

According to the vehicle seat according to the second aspect, in addition to the effect of the vehicle seat according to the first aspect, the protruding portion is projected from the main body portion to the lower end portion in the gravity direction of the panel member. Therefore, the rigidity of the side frame in the region where the panel member is arranged can be secured by the protrusion, and it is not necessary to secure the rigidity of the side frame in the region where the panel member is arranged only by the panel member. As a result, there is an effect that the thickness of the panel member can be reduced to reduce the weight of the vehicle seat.

According to the vehicle seat according to claim 3, in addition to the effect of the vehicle seat according to claim 1 or 2, the pair of side frames are erected from the edge portion inward in the opposite direction. A flange portion is provided, and both ends of the panel member are welded to a pair of first flange portions. Therefore, the cross-sectional coefficient of the side frame is determined by each of the panel member welded to the side frame and the first flange portion. Can be enhanced. This has the effect of suppressing buckling of the side frame.

Further, the heat input to the side frame when the panel member is welded to the side frame can be input to the first flange portion. This has the effect of suppressing the side frame from bending due to the heat of welding the panel members.

According to the vehicle seat according to claim 4, in addition to the effect of the vehicle seat according to claim 3, the protruding portion includes a second flange portion that is erected horizontally from the edge portion, so that the protruding portion is provided. The section modulus of the edge of the can be increased. This has the effect of making it easier to prevent the side frame from buckling between the panel member and the main body in the direction of gravity.

According to the vehicle seat according to claim 5, in addition to the effect of the vehicle seat according to claim 4, the second flange portion is erected in a direction opposite to the erection direction of the first flange portion. Therefore, when a force that bends the mating surface of the side frame and the reinforcing plate is input toward one of the standing directions of the first flange portion and the second flange portion, the force is applied to the first flange portion or the second flange portion. It is possible to act in the direction of pulling the standing tip portion of either one of the flange portions. This has the effect of suppressing warping of the mating surfaces of the side frame and the reinforcing plate.

According to the vehicle seat according to claim 6, in addition to the effect of the vehicle seat according to claim 4 or 5, the seat cushion includes a cover member for covering the side frame, and the second flange portion has a second flange portion. A locked portion to which the cover member is locked is formed, and the locked portion increases the surface area of the second flange portion. Therefore, the heat generated when the projecting portion is welded to the side frame is applied to the second flange portion. Can easily dissipate heat. As a result, there is an effect that the amount of heat input to the side frame can be reduced to prevent the side frame from bending due to the heat of welding the projecting portion.

Further, since the locked portion in which the cover member is locked is formed in the second flange portion, the role of securing the cross-sectional coefficient of the side frame and the role of locking the cover member are provided in the second flange portion. You can have it. Therefore, it is not necessary to separately form the portion for ensuring the rigidity of the side frame and the portion for locking the cover member, so that it is possible to prevent the vehicle seat from becoming large and to reduce the weight of the vehicle seat. There is an effect.

According to the vehicle seat according to claim 7, in addition to the effect of the vehicle seat according to any one of claims 3 to 6, the protruding portion is partially located outside the edge portion of the side frame. Since a part of the protruding portion located outside the edge of the side frame is welded to the first flange portion, the welded surface of the reinforcing plate and the panel member to the side frame is the same surface of the first flange portion. Can be set to. This allows an operator who welds the reinforcing plate and the panel member to the side frame to weld one of the reinforcing plate or the panel member to the side frame and then weld the other of the reinforcing plate or the panel member without changing the posture. .. As a result, there is an effect that the efficiency of welding work can be improved.

According to the vehicle seat according to claim 8, in addition to the effect of the vehicle seat according to any one of claims 1 to 7, a rear pipe having both ends connected to a pair of side frames is provided, and a protruding portion is provided. Since a predetermined gap is formed between the welded portion of the side frame and the connecting portion of the rear pipe and the side frame, the rigidity of the side frame of the portion where the predetermined gap is formed can be weakened. As a result, when an excessive load from the rear of the vehicle (for example, a force that another vehicle collides with from the rear) is input to the side frame, a predetermined gap is buckled and an unspecified portion of the side frame is seated. You can prevent it from giving in. Therefore, it is not necessary to increase the strength of the reinforcing plate and the panel member more than necessary, and there is an effect that the strength setting of the reinforcing plate and the panel member can be simplified.

Further, a predetermined gap is formed between the protruding portion and the welded portion of the side frame and the connecting portion of the rear pipe and the side frame, and is formed at a position separated from the rotating shaft of the seat back from the main body portion of the reinforcing plate. Therefore, a device arranged around the rotation axis of the seat back (for example, a rotation device for rotating the seat back or a reclining device for stopping the seat back at a predetermined position) is damaged by buckling of the side frame. Can be suppressed.

According to the vehicle seat according to claim 9, in addition to the effect of the vehicle seat according to any one of claims 1 to 8, the seat back frame is located at a position outside the edge of the side frame. The reinforcing plate is provided with a protrusion that is displaced according to the rotational displacement, and the reinforcing plate is provided with a regulating portion that protrudes at a position that overlaps with the displacement locus of the protruding portion. Is regulated, so when the rotation of the seat back frame is restricted and an excessive force is applied in the restricted direction, the regulation part is bent to prevent the side frame from buckling. It has the effect of being able to do it.

It is a perspective rear view of the vehicle seat in 1st Embodiment of this invention. (A) is a side view of the vehicle seat in the IIa direction view of FIG. 1, (b) is a rear view of the vehicle seat in the IIb direction view of FIG. 1, and (c) is a rear view of FIG. 2 (c). It is sectional drawing of the vehicle seat in line IIcc-IIc of a). It is a rear view of the vehicle seat in the 2nd Embodiment.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. First, the vehicle seat 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective rear view of the vehicle seat 1 according to the first embodiment of the present invention. 2 (a) is a side view of the vehicle seat 1 in the IIa direction view of FIG. 1, and FIG. 2 (b) is a rear view of the vehicle seat 1 in the IIb direction view of FIG. (C) is a schematic cross-sectional view of the vehicle seat 1 on the line IIc-IIc of FIG. 2 (a).

In the following description, with respect to the vehicle seat 1 in the state shown in FIG. 2A, the left side of the paper surface is the front side, the right side of the paper surface is the rear side, the upper side of the paper surface is the upper side, and the lower side of the paper surface is the lower side. As the side, the back side of the paper surface is the right side, and the front side of the paper surface is the left side. Further, the arrows FB, UD, and LR in the drawing indicate the front-rear direction, the up-down direction, and the left-right direction of the vehicle seat 1, respectively.

Further, FIG. 1 shows a state in which the side cover member 2a and the back cover member 3a of the vehicle seat 1 are disassembled, and FIGS. 2 (a) to 2 (c) show the side cover member 2a and the back cover member. The state in which 3a is removed is shown. Further, in FIGS. 2 (b) and 2 (c), the welded portion R1 between the side frame 21 and the protruding portion 22b of the reinforcing plate 22 is illustrated surrounded by a two-dot chain line, and the side frame 21 and the panel member 23 are shown. The welded portion R2 of the above is illustrated surrounded by a two-dot chain line.

As shown in FIGS. 1 and 2, the vehicle seat 1 is a seat mounted on a vehicle (for example, an automobile or a railroad vehicle). The vehicle seat 1 mainly includes a seat cushion 2 on which the seated person is seated, a seat back 3 which is a backrest of the seated person, and a headrest 4 which supports the head of the seated person.

The seat cushion 2 is provided with a seat cushion frame 20 forming the skeleton of the seat cushion 2 inside, and the seat back 3 is provided with a seat back frame 30 forming the skeleton of the seat back 3 inside. Further, a side cover member 2a is laid on the outside of the connecting portion between the seat back frame 30 and the seat cushion frame 20 in the left-right direction (arrow LR direction), and the connecting portion between the seat back frame 30 and the seat cushion frame 20. A back cover member 3a is laid behind the back cover member 3a.

The seat cushion frame 20 is composed of a plurality of metallic members. Further, the seat cushion frame 20 includes a pair of left and right side frames 21 that connect the seat back frame 30 in a rotatable state, a reinforcing plate 22 welded to the pair of side frames 21, and a pair of side frames 21 at both ends. The side cover member 2a is engaged with the panel member 23, which is welded to the edges of the two side frames to connect the pair of side frames, and the rear pipe 24, which is connected by inserting both ends into each of the pair of side frames 21. Mainly includes a joint member 25.

The side frame 21 mainly includes a main body portion 21a formed in a plate shape and a first flange portion 21b erected from an edge portion of the main body portion 21a. Further, the pair of side frames 21 are arranged in a state where the plate surfaces of the main body portion 21a face each other.

The main body 21a is arranged with the plate surface oriented in the left-right direction (arrow FB direction). Further, the main body 21a is formed with through holes (not shown) through which the shaft portion 31 of the seat back frame 30 and the end portion of the rear pipe 24, which will be described later, are inserted, and the shaft portion 31 and the shaft portion 31 are formed in the respective through holes. And the rear pipe 24 is connected. As a result, the pair of side frames 21 are connected by the rear pipe 24.

The first flange portion 21b is erected from the edge portion of the main body portion 21a toward the inside in the opposite direction of the main body portion 21a of the pair of side frames 21. Thereby, the cross-sectional coefficient of the side frame 21 can be increased.

The reinforcing plate 22 includes an annular portion 22a formed in an outer shape obtained by dividing the annular shape in half in the radial direction, a protruding portion 22b protruding downward in the gravitational direction from one end of the annular portion 22a in the circumferential direction, and an annular portion. It is mainly provided with an engaging portion 22c that is erected from the inner peripheral edge of the portion 22a and a regulating portion 22d that is projected radially outward from two locations on the outer peripheral edge of the annular portion 22a. Further, the reinforcing plate 22 is arranged on the outer side of the pair of side frames 21 in the opposite direction.

The annular portion 22a is a member that suppresses bending of the connecting portion between the seat back frame 30 and the side frame 21 due to the load input from the seat back frame 30 (seat back 3) to the side frame 21, and the main body portion 21a. It is arranged around the shaft portion 31 of the seat back frame 30 to be inserted into the seat back frame 30.

The overall plate thickness T1 of the reinforcing plate 22 (see FIG. 2C) is formed to be thicker than the plate thickness T2 of the side frame 21 (see FIG. 2C) (T1> T2). Further, the center of the annular portion 22a formed in an annular shape is set coaxially with the shaft portion 31 of the seat back frame 30, and is welded to the main body portion 21a of the side frame 21. Further, the annular portion 22a is arranged at a position surrounding the rear side (arrow B direction side) of the shaft portion 31. As a result, the rigidity around the rear side of the shaft portion 31 can be increased, and the side frame 21 can be prevented from buckling when the shaft portion 31 is pressed rearward with respect to the side frame 21.

The protruding portion 22b is projected from one end side of the annular portion 22a located below the shaft portion 31 (in the direction of arrow D) in an oblique direction downward and forward (in the direction of arrow F). The width of the protruding portion 22b in the direction orthogonal to the projecting direction in the side view is set smaller than the width in the radial direction of the annular portion 22a. Therefore, it is possible to prevent the weight of the vehicle seat 1 from increasing by forming the protruding portion 22b.

The protruding portion 22b is formed so that one end side located outside the edge portion of the main body portion 21a is formed along the edge portion of the main body portion 21a of the side frame 21. Further, the protruding portion 22b is welded to the base end portion (main body portion 21a side) of the first flange portion 21b whose one end side is erected from the edge portion of the main body portion 21a.

The protruding portion 22b includes a second flange portion 22b1 that is erected from an edge portion on one end side toward the side opposite to the main body portion 21a (direction opposite to the erection direction of the first flange portion 21b). The protrusion 22b can improve the cross-sectional coefficient by the amount that the second flange portion 22b1 is formed. Therefore, it is possible to prevent the main body 21a around the portion to which the protruding portion 22b is welded (welded portion R1) from buckling due to a load from the rear of the vehicle.

Since the second flange portion 22b1 is erected in the direction opposite to the erection direction of the first flange portion 21b of the side frame 21, the erection direction (arrow) between the first flange portion 21b and the second flange portion 22b1. When a force that warps the mating surface of the side frame 21 and the reinforcing plate 22 is input toward one of the LR directions), the force is applied to either the first flange portion 21b or the second flange portion 22b1. It can act in the direction of pulling the vertical tip. As a result, it is possible to prevent the mating surface of the side frame 21 and the reinforcing plate 22 from warping in the left-right direction (arrow LR direction).

The engaging portion 22c has one end of a return spring SP1 that urges the seat back 3 in the rotation direction (counterclockwise in FIG. 2A) that erects the seat back 3 at a position tilted toward the back side (arrow B direction side). It is a locking portion and is erected toward the side opposite to the main body 21a side. The return spring SP1 is formed by being spirally wound a plurality of times, one end of the inside which is wound a plurality of times is curved in a substantially U shape, and an engaging portion 22c is inserted (engaged) into the curved portion. Helix.

Further, the return spring SP1 is rotated in the rotation direction (clockwise 2 (a)) in which the other end side is locked to the projecting portion 32 described later and the seat back 3 at a position tilted toward the back surface side (arrow B direction side) is erected. ).

The two regulating portions 22d are portions that regulate the rotation of the seat back 3 that rotates with respect to the seat cushion 2, and are formed on the rotation locus of the protruding portion 32 of the seat back frame 30, which will be described later. It should be noted that one of the two restricting portions 22d is rotated in the rotation direction (counterclockwise in FIG. 2A) for raising the seatback 3 at a position tilted toward the back side (arrow B direction side). The seat back 3 which regulates the rotation of 3 and the other of the two regulating portions 22d is rotated in the rotation direction (clockwise in FIG. 2 (a)) in which the seat back 3 at the standing position is tilted toward the back side. Regulate the rotation of.

The panel member 23 is formed in the shape of a rectangular plate long in the left-right direction (arrow LR direction), and both ends in the longitudinal direction are welded to the back side of the first flange portion 21b of the pair of side frames 21. Therefore, the cross-sectional coefficient of the edge portion of the side frame 21 can be increased by the amount that the panel member 23 is welded.

The panel member 23 is arranged below the annular portion 22a of the reinforcing plate 22 arranged on the side frame 21. Therefore, even in the region where the annular portion 22a is not arranged, the panel member 23 can suppress the side frame 21 from buckling due to the load from the rear of the vehicle.

The protruding portion 22b is arranged between the panel member 23 and the annular portion 22a in the direction of gravity (arrow U-D direction). Therefore, the rigidity of the main body portion 21a between the panel member 23 and the annular portion 22a in the direction of gravity can be ensured by the protruding portion 22b. As a result, it is possible to prevent the main body portion 21a from buckling between the reinforcing plate 22 and the panel member 23 in the direction of gravity due to the force of another vehicle colliding from behind.

Further, the tip of the protruding portion 22b projecting diagonally downward (in the direction of arrow D) and forward (in the direction of arrow F) is located below the panel member 23. Therefore, the rigidity of the side frame 21 in the region where the panel member 23 is arranged can be ensured by the protruding portion 22b, and the rigidity of the side frame 21 in the region where the panel member 23 is arranged needs to be ensured only by the panel member 23. It disappears. As a result, the thickness of the panel member 23 can be reduced to reduce the weight of the vehicle seat 1.

The plate thickness T3 of the panel member 23 (see FIG. 2C) is set thinner than the plate thickness T2 of the side frame 21 (see FIG. 2C) (T2> T3). As a result, even when the panel member 23 is added, it is possible to prevent the weight of the vehicle seat 1 from increasing.

The panel member 23 is arranged at a position where both ends are separated from the base end side of the first flange portion 21b (the connecting side between the first flange portion 21b and the main body portion 21a) and the back surface side (arrow) of the first flange portion 21b. It is welded to the side surface (on the B direction side). Therefore, the welding position can be separated from the main body portion 21a, and the heat input to the side frame 21 when the panel member 23 is welded to the side frame 21 can be easily input to the first flange portion 21b rather than the main body portion 21a. As a result, it is possible to prevent the heat from welding the panel member 23 from being input to the main body 21a and to prevent the main body 21a from bending.

Further, in the present embodiment, since the panel member 23 is welded to the first flange portion 21b erected inward in the facing direction of the pair of side frames 21, the panel member 23 is directly welded to the main body portion 21a. By adjusting (increasing) the vertical dimension of the first flange portion 21b from the main body portion 21a as compared with the case, the heat input to the side frame 21 when the panel member 23 is welded to the side frame 21 can be transferred to the main body. It is possible to make it easier to input to the first flange portion 21b than to the portion 21a. Therefore, it is possible to prevent the heat generated by welding the panel member 23 from being input to the main body portion 21a and to prevent the main body portion 21a from bending.

In this case, since the first flange portion 21b is erected inward in the opposite direction of the pair of side frames 21, the vehicle seat is adjusted when the erection dimension of the first flange portion 21b from the main body portion 21a is adjusted. It is possible to prevent the outer shape of 1 from becoming large.

Further, the panel member 23 is arranged at a position where both ends of the panel member 23 are separated from the base end side of the first flange portion 21b (the connecting side between the first flange portion 21b and the main body portion 21a), and the first flange portion 23 is arranged. Since it is welded to the side surface on the back surface side (arrow B direction side) of 21b, there is an error in each accuracy of the processing accuracy of the panel member 23, the processing accuracy of the first flange portion 21b, and the assembly accuracy of the pair of side frames 21. The range of can be increased. As a result, the manufacturing cost required for manufacturing the vehicle seat 1 can be reduced.

The rear pipe 24 is arranged below the seat back frame 30 connected to the side frame 21 (in the direction of arrow D) and in a region different from the reinforcing plate 22 arranged on the main body 21a. Further, as described above, both ends of the rear pipe 24 are inserted into and connected to each of the pair of side frames 21. Therefore, it is possible to prevent the side frame 21 from buckling in the left-right direction due to a load from the rear of the vehicle.

A gap S1 (see FIG. 2A) is formed between the welded portion R1 of the protruding portion 22b and the side frame 21 and the connecting portion of the rear pipe 24 and the side frame 21. The gap S1 is set in the circumferential direction centered on the point A (see FIG. 2A) at the edge of the main body 21a (side frame 21). The point A at the edge of the main body 21a is set at the same position as the center of the force acting on the main body 21a when the connecting portion of the side frame 21 with the seat back frame 30 is pressed toward the back side. Will be done.

The engaging member 25 is arranged on the front side (arrow F direction side) of the connecting portion between the seat back frame 30 and the side frame 21, and is welded to the main body portion 21a. The engaging member 25 is formed in a plate shape and includes an engaging hole 25a penetrating in the plate thickness direction.

The engagement hole 25a is a hole for engaging the side cover member 2a. As a result, when the side cover member 2a is arranged at the connecting portion between the seat back frame 30 and the seat cushion frame 20, the engaged portion (not shown) of the side cover member 2a is engaged with the engaging hole 25a. The side cover member 2a can be arranged on the vehicle seat 1.

The seat back frame 30 is composed of a plurality of metallic members. Further, the seat back frame 30 mainly includes a pair of shaft portions 31 and projecting portions 32 that project in the left-right direction.

The shaft portion 31 is formed in a columnar shape, and is arranged in a state in which the central axis thereof faces the left-right direction (arrow LR direction). Further, the pair of shaft portions 31 are pivotally supported by being inserted into each of the pair of side frames 21 with the central axes of the cylinders set coaxially. Therefore, the seat back frame 30 (seat back 3) can be rotated around the center of the shaft portion 31.

The projecting portion 32 is formed in a plate shape whose cross section bends like a crank, one end side is welded to the seat back frame 30, and the other end side is toward the outside of the seat back frame 30 in the left-right direction (arrow LR direction). Be projected. As a result, the projecting portion 32 is displaced about the center of the shaft portion 31 as the seat back frame 30 is rotationally displaced.

The projecting portion 32 is arranged outside the edge portion of the side frame 21. Further, the projecting portion 32 is set at a position where the displacement locus of the central portion that bends like a crank overlaps with the two regulating portions 22d. As a result, it is possible to prevent the projecting portion 32 from coming into contact with the side frame 21 when the projecting portion 32 is displaced, and further, the projecting portion 32 is brought into contact with the regulating portion 22d of the reinforcing plate 22 to bring the seat back. The rotation of the frame 30 can be regulated.

Therefore, when the protruding portion 32 is brought into contact with the regulating portion 22d and an excessive force is input in the direction in which the rotation of the seat back frame 30 is restricted while the rotation of the seat back frame 30 is restricted. It is possible to prevent the side frame 21 from buckling by bending the regulating portion 22d.

Further, the other end of the return spring SP1 is locked to the tip of the protruding portion 32 on the other end side. Therefore, the projecting portion 32 can have a role of locking the return spring SP1 and a role of abutting the regulating portion 22d to regulate the rotation of the seat back 3. As a result, the number of parts arranged on the seat back frame 30 can be reduced, and the vehicle seat 1 can be made lighter.

According to the vehicle seat 1 configured as described above, the reinforcing plate 22 is formed from an annular portion 22a arranged around the connecting portion of the side frame 21 and the seat back frame 30 and one end of the annular portion 22a. The panel member 23 includes a projecting portion 22b projecting downward (in the direction of arrow D) and forward (in the direction of arrow F), and the panel member 23 is formed in a plate shape thinner than the plate thickness of the pair of side frames 21 and has an annular portion. It is arranged below 22a, and the protruding portion 22b protrudes between the panel member 23 and the annular portion 22a in the direction of gravity (arrow U-D direction) and is welded to the side frame 21. The rigidity of the main body portion 21a between the panel member 23 and the annular portion 22a in the above can be ensured by the protruding portion 22b. Therefore, it is possible to prevent the main body portion 21a from buckling between the reinforcing plate 22 and the panel member 23 due to a force at the time of a collision of another vehicle from the rear.

Further, the panel member 23 can be set to a plate thickness thinner than the plate thickness of the side frame 21 by ensuring the rigidity of the side frame 21 by the projecting portion 22b as described above, and the projecting portion 22b is one of the annular portions 22a. Since it is projected from the portion (one end), it is possible to prevent the weight of the vehicle seat 1 from increasing. That is, the vehicle seat 1 can be made lighter.

In the protruding portion 22b, the edge portion on the side of the second flange portion 22b1 is located outside the edge portion of the side frame 21, and the side surface of the protruding portion 22b on the contact side with the main body portion 21a is the back surface of the first flange portion 21b. It is welded to the side (edge of the side frame 21). The panel member 23 is welded to the back surface side of the first flange portion 21b. Therefore, the welding surface of the reinforcing plate 22 and the panel member 23 to the side frame 21 can be set to the same surface of the first flange portion 21b. As a result, the operator who welds the reinforcing plate 22 and the panel member 23 to the side frame 21 welds one of the reinforcing plate 22 or the panel member 23 to the side frame 21 and then does not change the posture of the reinforcing plate 22 or the panel member 23. The other can be welded. As a result, the efficiency of welding work can be improved.

Since a gap S1 (see FIG. 2A) is formed between the welded portion R1 of the projecting portion 22b and the side frame 21 and the connecting portion of the rear pipe 24 and the side frame 21, the gap S1 is formed. The rigidity of the side frame 21 of the portion can be weakened. As a result, when an excessive load from the rear of the vehicle (for example, a force that another vehicle collides with from the rear) is input to the side frame 21, the region of the gap S1 is buckled and the side frame 21 is unspecified. It is possible to prevent the portion from buckling. Therefore, it is not necessary to increase the strength of the reinforcing plate 22 and the panel member 23 more than necessary, and the strength setting of the reinforcing plate 22 and the panel member 23 can be simplified.

Further, the gap S1 is formed between the welded portion R1 of the projecting portion 22b and the side frame 21 and the connecting portion of the rear pipe 24 and the side frame 21, and is separated from the rotation axis of the seat back 3 by the annular portion 22a. Since it is formed at the position, when the side frame 21 buckles in the region of the gap S1, the device (for example, rotation for rotating the seat back 3) is arranged around the rotation axis of the seat back 3 due to the buckling. It is possible to prevent the device or the reclining device that stops the seat back 3 at a predetermined position from being damaged.

Next, the vehicle seat 1 according to the second embodiment will be described with reference to FIG. In the first embodiment, the case where the side cover member 2a is engaged with the engagement hole 25a of the engagement member 25 arranged in the side frame 21 has been described, but in the vehicle seat 1 in the second embodiment, the case has been described. A case where the side cover member 202a is engaged with the through hole 222b2 formed in the second flange portion 222b1 will be described. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 3 is a rear view of the vehicle seat 1 according to the second embodiment. Note that FIG. 3 corresponds to the rear view in FIG. 2 (b). Further, in FIG. 3, the engaged portion 202a1 arranged inside the side cover member 202a is shown by a chain line.

As shown in FIG. 3, the second flange portion 222b1 in the second embodiment is formed with through holes 222b2 penetrating in the plate thickness direction at a plurality of locations (two locations in the present embodiment).

Further, the side cover member 202a arranged at the connecting portion between the side frame 21 and the seat back frame 30 is formed in a box shape in which the side frame 21 side opens, and the engaged portion 202a1 projecting in a columnar shape inside the side cover member 202a1. Are formed at a plurality of locations (two locations in the present embodiment).

The engaged portion 202a1 is formed at a position corresponding to the through hole 222b2 when the side cover member 202a is arranged at the connecting portion between the side frame 21 and the seat back frame 30. The engaged portion 202a1 is formed to have substantially the same diameter as the through hole 222b2, and can be inserted inside the through hole 222b2. In the present embodiment, the through hole 222b2 is set to have a diameter smaller than the plate thickness of the second flange portion 222b1.

As a result, when the side cover member 202a is arranged at the connecting portion between the side frame 21 and the seat back frame 30, the engaged portion 202a1 is inserted into the through hole 222b2 to penetrate the engaged portion 202a1. It can be engaged with 222b2. Therefore, the second flange portion 222b1 can have a role of increasing the rigidity of the side frame 21 and a role of engaging the side cover member 202a.

As a result, it is not necessary to dispose the engaging member 25 for engaging the side cover member 202a on the side frame 21, and the weight of the vehicle seat 1 can be reduced accordingly.

Further, since the through hole 222b2 having a diameter smaller than the plate thickness of the second flange portion 222b1 is formed in the second flange portion 222b1 which is thicker than the side frame 21, the surface area of the second flange portion 222b1 can be increased. .. Therefore, when the projecting portion 222b is welded to the side frame 21, the welding heat input to the second flange portion 222b1 can be easily dissipated. As a result, it is possible to prevent the main body portion 21a from bending due to the heat generated when the projecting portion 222b is welded to the side frame 21.

Although the present invention has been described above based on the above-described embodiment, the present invention is not limited to the above-described embodiment, and it is easy to make various modifications and improvements within a range that does not deviate from the gist of the present invention. It can be inferred.

In the first embodiment, the case where the plate thickness T1 of the reinforcing plate 22 is formed to be thicker than the plate thickness T2 of the side frame 21 has been described, but the present invention is not necessarily limited to this, and the rigidity of the reinforcing plate 22 is the side. It may be higher than the rigidity of the frame 21.

For example, if the cross section of the annular portion 22a of the reinforcing plate 22 is curved in a continuous wavy shape so that the rigidity of the reinforcing plate 22 can be made higher than the rigidity of the side frame 21, the plate thickness T1 of the reinforcing plate 22 is used as the side frame. It may be smaller than the plate thickness T2. In this case, the vehicle seat 1 can be made lighter by the amount that the plate thickness T1 of the reinforcing plate 22 can be made thinner.

In the first embodiment, the case where the welding of the protrusion 22b and the side frame 21 and the welding of the panel member 23 and the side frame 21 are performed separately has been described, but the present invention is not necessarily limited to this. For example, welding of the protrusion 22b and the side frame 21 and welding of the panel member 23 and the side frame 21 may be performed at the same time. In this case, the efficiency of the welding work can be improved because the welding can be performed at the same time.

In the first embodiment, the case where the second flange portion 22b1 and the first flange portion 21b are erected in opposite directions has been described, but the present invention is not necessarily limited to this. For example, the second flange portion 22b1 may be erected in the same direction as the first flange portion 21b.

In this case, it is preferable that the protruding portion 22b and the side frame 21 are welded to the upright tip portion of the second flange portion 22b1 and the side frame 21. According to this, the welded portion R1 between the protruding portion 22b and the side frame 21 and the welded portion R2 between the panel member 23 and the side frame 21 can be brought close to each other, so that the welded portion 22b and the side frame 21 can be welded. The work efficiency of the work and the welding work of the panel member 23 and the side frame 21 can be improved.

In the second embodiment, the case where the through hole 222b2 penetrating the second flange portion 222b1 is formed has been described, but the present invention is not necessarily limited to this, and for example, the portion where the side cover member 202a is locked may be formed. It may be formed by notching or projecting from the vertical tip portion of the second flange portion 222b1.

1 Vehicle seat 2 Seat cushions 2a, 202a Side cover member (cover member)
3 Seat back 20 Seat cushion frame 21 Side frame 21b First flange portion 22 Reinforcing plate 22a An annular portion (main body portion)
22b Protruding portion 22b1,222b1 Second flange portion 222b2 Through hole (locked portion)
22d Regulator 23 Panel member 24 Rear pipe 25 Engagement member (protrusion)
30 Seat back frame 31 Shaft (connecting part)
S1 gap

Claims (9)

In a vehicle seat provided with a seat cushion frame forming the skeleton of the seat cushion and a seat back frame forming the skeleton of the seat back.
The seat cushion frame includes a pair of side frames that connect the seat back frames in a rotatable state, a reinforcing plate that is welded to the pair of side frames, and both ends welded to the edges of the pair of side frames. With panel members to be
The reinforcing plate includes a main body portion arranged around a connecting portion of the side frame and the seat back frame, and a protruding portion protruding downward in the direction of gravity from a part of the main body portion.
The panel member is formed in a plate shape thinner than the thickness of the pair of side frames, and is arranged below the main body in the direction of gravity.
A vehicle seat characterized in that the protruding portion protrudes between the panel member and the main body portion in the direction of gravity and is welded to the side frame. The vehicle seat according to claim 1, wherein the protruding portion protrudes from the main body portion to a lower portion in the gravity direction than the lower end portion in the gravity direction of the panel member. The pair of side frames are provided with a first flange portion that is erected inward in the opposite direction from the edge portion, and both ends of the panel member are welded to the pair of first flange portions. The vehicle seat according to claim 1 or 2. The vehicle seat according to claim 3, wherein the protruding portion includes a second flange portion that is erected horizontally from the edge portion. The vehicle seat according to claim 4, wherein the second flange portion is erected in a direction opposite to the erection direction of the first flange portion. The seat cushion includes a cover member that covers the side frame.
Claim 4 or 5 is characterized in that a locked portion to which the cover member is locked is formed in the second flange portion, and the surface area of the second flange portion is increased by the locked portion. Vehicle seats described in. A part of the protruding portion is located outside the edge portion of the side frame, and a part of the protruding portion located outside the edge portion of the side frame is welded to the first flange portion. The vehicle seat according to any one of claims 3 to 6. A rear pipe having both ends connected to the pair of side frames is provided, and a predetermined gap is formed between the protruding portion and the welded portion of the side frame and the connecting portion of the rear pipe and the side frame. The vehicle seat according to any one of claims 1 to 7. The seat back frame includes a protrusion that is displaced with the rotational displacement of the seat back frame at a position outside the edge of the side frame.
The reinforcing plate includes a regulating portion projecting at a position overlapping the displacement locus of the protruding portion.
The vehicle seat according to any one of claims 1 to 8, wherein the rotational displacement of the seat back frame is restricted by the contact of the protrusion with the regulating portion.

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