WO2016140295A1 - Seat frame - Google Patents

Abstract

The purpose of the present invention is to make a closed-cross-section structural section and an open-cross-section structural section appropriately coexist in a side frame. A side frame (10) that is provided at both ends of a vehicle seat in the width direction is provided with: a closed-cross-section structural section (10a) that forms one end section in a frame-extending direction; and an open-cross-section structural section (10b) that forms a section continuous with the closed-cross-section structural section (10a) in the frame-extending direction. Furthermore, a space (Q) that is formed by terminating a section continuing in the cross-section of the open-cross-section structural section (10b) is larger in a distant region (10y), of the open-cross-section structural section, that is located at a position distant from the closed-cross-section structural section (10a) in the frame-extending direction than in an adjacent region (10x) that is adjacent to the closed-cross-section structural section (10a) in the frame-extending direction.

Description

Seat frame

The present invention relates to a seat frame for a vehicle seat, and more particularly to a seat frame that is lighter than conventional products.

Conventionally, in order to reduce the weight of a vehicle seat, it is generally considered to reduce the thickness of each part of the seat frame. However, as the thickness of each part of the seat frame is reduced, the rigidity of the part decreases. On the other hand, when securing rigidity in the seat frame, it is conceivable that the cross-sectional structure of the portion where the rigidity or the like should be secured is a closed cross-sectional structure. For example, in the seat frame described in Patent Document 1, the side frame of the seat back frame has a closed cross-sectional structure.

Conventionally, there are known vehicle seats equipped with a height link device and a reclining device that support the seat body so as to be able to move up and down, and in order to improve vehicle fuel efficiency while ensuring the frame connection rigidity around these devices. Various ideas for reducing the weight of the frame have been made (see Patent Documents 2 and 3).

In the vehicle seat with the reclining device described in Patent Document 2, the cushion side frame disposed on the left and right sides of the cushion frame serving as the skeleton of the seat cushion is configured to form a closed cross-sectional structure.
Moreover, in the vehicle seat with a height link device described in Patent Document 3, a closed cross-sectional structure is formed by overlapping the reinforcing frame from the seat width direction on the lower end portion of the cushion side frame.
With the above configuration, the frame can be formed thin while securing the rigidity of the cushion side frame, and the weight of the frame can be reduced.

Conventionally, in a vehicle seat provided with a rail device that supports the seat body so as to be movable in the longitudinal direction of the seat with respect to the vehicle body floor, a connection bracket having a substantially L-shaped body is provided to connect the seat body and the rail device. It is used.
Although the connecting bracket is generally attached to the upper surface of the upper rail of the rail device using bolts, rivets, etc., a new technique for joining by laser welding is known for the purpose of reducing the number of parts and reducing the weight of the seat. Yes (see Patent Documents 4 and 5).

In the vehicle seats described in Patent Document 4 and Patent Document 5, the connection bracket and the upper rail (movable rail) are joined to each other by laser welding from above the connection bracket in a state where the connection bracket and the upper rail (movable rail) are in contact with each other in the vertical direction. .
And while ensuring the joint strength by laser welding, the welding location is taken into consideration in order to simplify the welding operation, and the weld bead (welding mark) formed by laser welding has a predetermined shape on the upper surface of the connecting bracket. It extends as if making.

JP 2014-88133 A JP 2006-231991 A JP 2011-20593 A JP 2009-202814 A JP 2013-107558 A

The seat frame described in Patent Document 1 will be described in detail. The side frame (strictly, the side frame of the seat back frame) has a closed cross-sectional structure from the upper end to the lower end. In such a configuration, although it is possible to ensure the rigidity of the side frame, it is difficult to sufficiently reduce the weight of the seat frame. Therefore, as a configuration for ensuring both rigidity and weight reduction, it is conceivable that a closed cross-section structure portion and an open cross-section structure portion coexist in the side frame. However, if the cross-sectional shape suddenly changes at the boundary portion between the closed cross-section structure portion and the open cross-section structure portion, problems such as significant reduction in rigidity and stress concentration may occur at the boundary portion.

Also, some seat frames include a frame (connection frame) that connects between side frames. In such a seat frame, when the closed cross-section structure portion and the open cross-section structure portion coexist in the side frame, the connection frame is appropriately attached to the side frame while considering the positional relationship between the connection frame and the side frame. Is required.

In addition, other members, for example, a supporting member for supporting an occupant or a baffle attachment member for attaching an airbag baffle may be attached to the side frame. When the above-mentioned member is attached to the side frame in a configuration in which the closed cross-section structure portion and the open cross-section structure portion coexist in the side frame, it is required to be attached at a suitable position for smooth attachment work. .

In addition, for a vehicle seat such as Patent Documents 2 and 3, there is a demand for a technique that can further improve frame connection rigidity around a device such as a height link device and reduce the weight of the frame. It was.

Further, in Patent Documents 4 and 5, since a part of the connection bracket is mainly melted and joined to the upper rail by irradiating a laser beam from directly above the connection bracket toward the connection bracket and the upper rail, for example, the connection bracket As compared with the case where the laser beam is directly applied to the portion where the upper rail is in contact with the upper rail, the welding strength may be reduced.
Also, since the connecting bracket is generally thicker than the upper rail, laser welding from directly above the connecting bracket may reduce the welding strength, and it may be necessary to increase the laser irradiation intensity, which is affected by heat. There was a possibility of becoming easy.
Therefore, there has been a demand for a technique that can further improve the joining strength by laser welding and facilitate the welding work.

In addition, some of the above vehicle seats further include a height link device and a reclining device that support the seat body so that the seat body can be moved up and down, and laser welding work is performed in consideration of the positional relationship with the components of these devices. It was necessary to perform assembly work including.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a seat frame capable of appropriately coexisting a closed cross-section structure portion and an open cross-section structure portion in a side frame. There is.
Another object of the present invention is to appropriately attach a connecting frame for connecting the side frames to the side frame in which the closed cross-section structure portion and the open cross-section structure portion coexist appropriately. It is to provide a seat frame.
A third object of the present invention is to attach a support member for supporting an occupant and a webbing of an airbag to a side frame in which a closed cross-section structure portion and an open cross-section structure portion coexist appropriately. An object of the present invention is to provide a seat frame capable of appropriately attaching a bundling attachment member.
Another object of the present invention is to provide a vehicle seat frame capable of improving the rigidity of a seat frame as a skeleton and reducing the weight of the seat frame.
Another object of the present invention is to provide a seat frame that can secure a frame connection rigidity around a device such as a height link device or a reclining device and can reduce the weight of the seat frame.
Another object of the present invention is to provide a seat frame with a rail device that can improve the joining strength by welding components and facilitate the welding operation.
Another object of the present invention is to provide a seat frame with a rail device capable of performing an assembling operation including a welding operation in consideration of an arrangement relationship with a component such as a height link device. .

According to the seat frame of the present invention, the subject is a seat frame having side frames provided at both ends in the width direction of the vehicle seat, wherein the side frame is one end in the extending direction of the side frame. A closed cross-section structure portion in which a cross section intersecting with the extending direction is a closed cross-section structure, a portion continuous with the closed cross-section structure portion in the extending direction, and the cross-section is an open cross-section structure An open cross-section structure portion, and a gap formed by discontinuation of a continuous portion in the cross-section of the open cross-section structure portion in the extending direction of the open cross-section structure portion. The problem is that it is larger than the adjacent region located at a position adjacent to the closed cross-section structure portion in the separated region located at a position away from the closed cross-section structure portion in the extending direction. It is.

In the seat frame of the present invention configured as described above, the closed cross-section structure portion and the open cross-section structure portion coexist in the side frame. In addition, the gap formed by the interruption of the continuous portion in the cross section of the open cross-section structure portion is located at a position farther from the closed cross-section structure portion than the adjacent region in the position adjacent to the closed cross-section structure portion. It is larger in the separated area. That is, the degree of opening in the cross section of the open cross-section structure portion is larger in the separated region than in the adjacent portion. With such a configuration, it is possible to suppress a sudden change in the cross-sectional shape at the boundary portion between the closed cross-sectional structure part and the open cross-sectional structure part in the side frame, and to reduce the rigidity caused by the rapid change in the cross-sectional shape. It is possible to suppress stress concentration.

At this time, it is preferable that the gap in the adjacent region increases as the distance from the closed cross-section structure portion increases in the extending direction.
In the above configuration, the gap in the adjacent region (in other words, the degree of opening of the cross section) gradually increases as the distance from the closed cross section structure portion increases. This makes it possible to more effectively suppress changes in the cross-sectional shape at the boundary between the closed cross-section structure portion and the open cross-section structure portion.

At this time, in the seat frame, the separation region has a pair of end portions located at positions adjacent to the gap among the continuous portions in the cross section, and the pair of separation regions has Of the end portions, at least one end portion may be folded back to have two portions overlapping in the width direction, and the two portions may be joined to form a closed space.
In said structure, at least one edge part is return | folded among a pair of edge part which a separation area | region has. Further, the end portion has two portions that are overlapped in the width direction by being folded back, and further, the two portions are joined to form a closed space. As a result, the strength of the separated region can be improved.

At this time, it has a connection frame which connects between the side frames, and the connection frame is positioned on both sides of the first extension part in the width direction and the first extension part extending in the width direction. A second extending portion extending toward the side frame, and the second extending portion is inserted inside one end portion in the extending direction of the closed cross-section structure portion, and the closed section The adjacent region may be adjacent to the other end portion in the extending direction of the cross-sectional structure portion.
In the above configuration, the second extending portion of the connecting frame is inserted inside one end portion in the extending direction of the closed section structure portion, and an adjacent region is adjacent to the other end portion in the extending direction of the closed section structure portion. ing. With such a positional relationship, it is possible to arrange the connecting frames appropriately and to connect the side frames well with the connecting frames.

At this time, it is preferable that a portion of the second extending portion that enters the inside of one end portion in the extending direction of the closed cross-section structure portion is joined to the closed cross-section structure portion.
In said structure, the part which entered the inner side of the extending direction one end part of a closed cross-section structure part among 2nd extension parts is joined to the closed cross-section structure part. With such a configuration, the connecting frame can be more appropriately attached to the side frame.

At this time, in the seat frame, the length of the adjacent region in the extending direction may be shorter than the length of the closed cross-section structure portion in the extending direction.
According to said structure, since the length of an adjacent area | region where rigidity is lower among adjacent areas comes to be set shorter, it becomes possible to improve the rigidity of a side frame.

At this time, the adjacent region has a pair of end portions located at positions adjacent to the gap among the continuous portions in the cross section, and in the width direction to support the occupant, A support member installed between the pair of ends is attached to the side frame, the attachment position of the support member is the same position as the adjacent region in the extending direction, and the adjacent region has It is good if the position is away from the part.
In said structure, the attachment position of the supporting member in a side frame is the same position as an adjacent area | region in the extending direction, and is a position away from a pair of edge part which an adjacent area | region has. With such a positional relationship, the support member can be appropriately attached to the side frame without interfering with the pair of end portions of the adjacent region.

At this time, the side frame is a back side frame serving as a skeleton of a backrest portion, and includes a cushion frame serving as a skeleton of a seating portion, and the cushion frame is disposed on the left and right sides in the seat width direction, A cushion side frame extending in a direction, and the cushion side frame has a closed cross-sectional structure in at least one of an upper part and a lower part of the cushion side frame, and the part having the closed cross-sectional structure Is preferably configured such that at least one of the outer wall portion and the inner wall portion in the sheet width direction forms a curved surface.
As described above, the side frame has a closed cross-sectional structure in at least one of the upper part and the lower part, and the part having the closed cross-sectional structure is configured such that the side wall portion forms a curved surface shape. Therefore, as compared with the conventional example, even when a load is concentrated and applied to the portion having the closed cross-sectional structure in the side frame, the stress is easily dispersed.
Therefore, the connection rigidity of the seat frame can be improved while maintaining the weight reduction of the seat.

At this time, the part having the closed cross-sectional structure is configured such that the one side wall part and the upper wall part and the bottom wall part respectively connected to the one side wall part form a continuous curved surface shape. Good to be.
With the above configuration, even when a load is applied to the portion having the closed cross-sectional structure, the stress is more easily dispersed.

At this time, it is preferable that the lower end portion of the cushion side frame is a portion having the closed cross-sectional structure, and the outer wall portion is configured to form a curved shape.
With the above-described configuration, it is possible to improve the connection rigidity at the lower end portion of the side frame that is particularly susceptible to load concentration and that is easily deformed due to compression stress. Further, since the outer wall portion is formed in a curved shape, the compressive stress is more easily dispersed.

At this time, the cushion side frame is attached to a side surface in the seat width direction of the first side frame portion in order to form the closed cross-sectional structure with the first side frame portion and the first side frame portion. And a two-side frame portion.
As described above, since a part of the side frame is formed by overlapping two frame members, the connection rigidity of the frame is further improved.

At this time, a cushion frame serving as a skeleton of the seating portion, a lower rail attached on the vehicle body floor, extending in a predetermined direction, slidably attached along the lower rail, and supporting the cushion frame, the upper rail And a connecting bracket mounted on the upper rail for connecting the cushion frame, the connecting bracket having an abutting portion that abuts against a contacted portion provided on the upper rail. And by welding the outer peripheral portion of the portion with which the abutted portion abuts, a welding mark is formed on at least one of the abutting portion and the abutted portion. It should be extended along.
As described above, since the outer peripheral portion of the contacted portion of the upper rail and the contact portion of the connecting bracket is welded, the upper rail and the connecting bracket are in contact with each other as compared with the conventional example. Since the portions can be directly welded, the joint strength by welding can be improved.
Moreover, since the weld trace formed by welding extends along the outer peripheral part of the part which contact | abutted mutually, welding strength can be improved further.

At this time, the abutment portion abuts in the vertical direction with respect to the abutted portion, and the connection bracket is mounted on the upper rail by laser welding of the outer peripheral portion from at least one side in the seat width direction. It is good to be attached to.
As described above, by performing laser welding from the outside or the inside in the sheet width direction, the welding operation can be performed from a position where a space is relatively easily secured.
Moreover, welding work can be performed more easily by selecting laser welding among various welding methods.

At this time, the welding mark includes a first welded portion extending along an outer side surface in the sheet width direction, a second welded portion extending along an inner side surface in the sheet width direction, of the outer peripheral portion, It is good to have.
With the above configuration, the joining strength of the connecting bracket can be further improved, and particularly stress applied in the seat width direction can be efficiently received.

At this time, a notch is formed in a part of the outer peripheral portion in the contact portion, and the welding mark may extend along the outer peripheral portion including the notch.
By forming the notch, the weldable outer peripheral portion can be extended, so that the welding strength is improved and the degree of freedom of the welding position is increased.

According to the present invention, it is possible to suppress a sudden change in the cross-sectional shape at the boundary portion between the closed cross-section structure portion and the open cross-section structure portion in the side frame, and to reduce rigidity and stress concentration due to the sudden change in the cross-sectional shape. Can be suppressed.
According to the present invention, the gap in the adjacent region gradually increases as the distance from the closed cross-section structure portion increases, so that the change in the cross-sectional shape at the boundary portion between the closed cross-section structure portion and the open cross-section structure portion can be more effectively suppressed. Is possible.
According to the present invention, it is possible to improve the strength of the separation region.
According to the present invention, it is possible to arrange the connecting frames appropriately and to connect the side frames well with the connecting frames.
According to the present invention, of the second extending portion, the portion that enters the inside of the extending direction one end portion of the closed cross-section structure portion is joined to the closed cross-section structure portion, so that the connecting frame is more than the side frame. It becomes possible to attach more appropriately.
According to the present invention, it is possible to improve the rigidity of the side frame by setting the length of the adjacent region having lower rigidity among the adjacent regions to be shorter.
According to the present invention, it is possible to appropriately attach the support member to the side frame.

According to the present invention, as compared with the conventional example, even when a load is concentrated and applied to a portion of the cushion side frame having the above-described closed cross-sectional structure, the stress is easily dispersed.
According to the present invention, it is possible to improve the connection rigidity at the lower end portion of the side frame where the load is particularly concentrated and the compressive stress is easily applied. Further, the compressive stress is more easily dispersed.
According to the present invention, since a part of the side frame is configured by overlapping two frame members, the connection rigidity of the frame is further improved.

According to the present invention, since the portion where the upper rail and the connecting bracket are in contact with each other can be directly welded as compared with the conventional example, the joint strength by welding can be improved. Moreover, since the welding trace extends along the outer peripheral portion of the portions that are in contact with each other, the welding strength can be further improved.
According to the present invention, by performing laser welding from the outside or the inside in the sheet width direction, a welding operation can be easily performed from a position where a space is relatively easily secured.
According to the present invention, the joining strength of the connecting bracket can be further improved, and particularly the stress applied in the seat width direction can be received efficiently.
According to the present invention, since the outer peripheral portion that can be welded can be extended by the notch, the welding strength is improved and the degree of freedom of the welding position is increased.

1 is an overall view of a vehicle seat according to a first embodiment. It is a figure when the seat frame which concerns on 1st Embodiment is seen from diagonally forward. It is a figure when the seat frame which concerns on 1st Embodiment is seen from diagonally backward. It is a schematic cross section which shows the location where the pillar guide is welded in a connection frame. It is a figure when the side frame which concerns on 1st Embodiment is seen from the side. It is a figure when one part which comprises a side frame is seen from the side. It is a figure when the other parts which comprise a side frame are seen from the side. It is a figure when the side frame which concerns on 1st Embodiment is seen from diagonally forward. It is a figure which shows the AA cross section in FIG. It is a figure which shows the BB cross section in FIG. It is a figure which shows CC cross section in FIG. It is a figure which shows the DD cross section in FIG. It is a figure which shows a 1st modification. It is a figure which shows the 2nd modification. It is a figure which shows a reclining apparatus and its attachment components. It is a perspective view of the vehicle seat which concerns on 2nd Embodiment. It is a perspective view of the seat frame used as the frame of a vehicular seat. FIG. 16 is an enlarged view of a main part of FIG. 15 and is a perspective view showing the periphery of a side frame. FIG. 17 is a cross-sectional view taken along the line EE of FIG. 16 and is a perspective view showing the height link device. FIG. 17 is a cross-sectional view taken along the line FF of FIG. 16 and showing the side frame. FIG. 17 is a cross-sectional view taken along the line GG in FIG. 16, illustrating a connection state between the side frame and the pan frame. It is a disassembled perspective view of a pan frame. FIG. 16 is an enlarged view of a main part of FIG. 15, showing a second embodiment of the side frame. FIG. 17 is a cross-sectional view taken along the line FF in FIG. 16, showing a second embodiment of the side frame. FIG. 16 is an enlarged view of a main part of FIG. 15, showing a connection bracket for connecting the seat cushion and the rail device. It is a front view explaining the state where the connection bracket was attached to the rail apparatus (upper rail). FIG. 24 is a cross-sectional view taken along line HH in FIG. 23, illustrating a state in which laser welding is performed from the outside and the inside in the sheet width direction. FIG. 24 is a cross-sectional view taken along the line II in FIG. 23 and illustrates a state in which laser welding is performed from the outside and the inside in the sheet width direction.

<First Embodiment>
The first embodiment of the present invention will be described below. The embodiment described below is merely an example for facilitating the understanding of the present invention, and does not limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof. Furthermore, in the following description, the contents regarding the material, shape, and size of each device and its component parts are merely one specific example, and do not limit the present invention. That is, the material, shape, and size of each device and its component parts can be freely designed as long as they satisfy the specific matters of the present invention.

Also, in the following description, the “front-rear direction” means the front-rear direction of the vehicle seat, and specifically corresponds to the direction in which the vehicle travels. The “width direction” means the width direction of the vehicle seat, and specifically, is a direction that coincides with the vehicle width direction (left-right direction).

Furthermore, the following description will be made assuming that the vehicle seat is in a use state (a state in which a seated person can be seated), unless otherwise specified. That is, in the following description, the posture and position of each part of the vehicle seat and the positional relationship with other members are the contents when the vehicle seat is in use.

<< Basic configuration of vehicle seat and seat frame >>
First, the basic configuration of a vehicle seat (hereinafter, this seat S) according to the present embodiment and a basic configuration of a seat frame F constituting the skeleton thereof will be described with reference to FIGS. As shown in FIG. 1, the seat S includes a seat back S1, a seat cushion S2, and a headrest S3. The seat back S1 and the seat cushion S2 are configured by placing the pad material P on the seat frame illustrated in FIGS. 2 and 3 and covering the surface of the pad material P with the skin material W. The headrest S3 is configured by arranging a pad material P on a core material (not shown) and covering the surface of the pad material P with a skin material W. A pair of headrest pillars (not shown) extending downward are provided below the headrest S3. The headrest S3 is supported by the upper end of the seat back S1 (strictly speaking, the seat back frame F1) via the pair of headrest pillars.

2 and 3, the seat S includes a seat back frame F1 included in the seat back S1 and a seat cushion frame F2 included in the seat cushion S2. The seat cushion frame F2 is connected to the upper rail RU of the slide rail device R disposed below the seat cushion frame F2. With this configuration, when the upper rail RU moves along the lower rail RL fixed to the vehicle body floor, the entire seat S including the seat cushion frame F2 slides.

In the present embodiment, the seat cushion frame F2 is connected to the upper rail RU via the rotation link XL as shown in FIG. The rotation link XL is a link member disposed on both sides of the seat cushion S2 in the width direction, and rotates about a rotation axis along the width direction. And the position of seat cushion S2 in the up-and-down direction comes to be adjusted because rotation link XL rotates while rotating with seat cushion S2.

Further, the lower end portion of the seat back frame F1 is connected to the rear end portion of the seat cushion frame F2 via the reclining device 80. By this reclining device 80, the seat back S1 including the seat back frame F1 is coupled to the seat cushion S2 in a state in which an inclination angle with respect to the seat cushion S2 can be adjusted. That is, the seat back S1 can rotate relative to the seat cushion S2 about the reclining shaft 81 along the width direction.

The seat S is different from a conventional general vehicle seat in the structure of the seat frame. Hereinafter, the configuration of the seat back frame F1 as the seat frame included in the seat S will be described in detail. The configuration described below (particularly the structure of the side frame 10) is not applicable only to the seat back frame F1, but can also be applied to the seat cushion frame F2.

<< Detailed configuration of seat back frame >>
The configuration of the seat back frame F1 included in the seat S will be described in detail with reference to FIGS. 2 and 3 and FIGS. As shown in FIG. 2, the seat back frame F1 forms a square frame when the seat frame F is viewed from the front. Further, the seat back frame F1 is lighter than a seat back frame included in a conventional general vehicle seat. More specifically, a material that is lighter than a material used for a conventional seat back frame is used as a material that constitutes the seat back frame F1 (for example, a steel plate that constitutes a side frame 10 described later). . Furthermore, when the parts constituting the seat back frame F1 are fastened and connected, the parts are fastened and connected by laser welding without using fasteners such as bolts, nuts, and screws. By adopting such a configuration, the seat back frame F1 according to the present embodiment is lighter.

The structure of the seat back frame F1 will be described. As shown in FIGS. 2 and 3, the seat back frame F1 has a pair of side frames 10 provided at both ends in the width direction. Further, as shown in the figure, the seat back frame F1 has an upper frame 30 that is connected to the upper end portions of the side frames 10 to connect the side frames 10 together. Furthermore, the seatback frame F1 has a lower member frame 50 that connects between the side frames 10 by being attached to the lower ends of the side frames 10, as shown in FIG. Further, an S spring 60 is installed between the side frames 10 as a support member that supports the back of the passenger from behind.

Hereinafter, the upper frame 30, the lower member frame 50, and the side frame 10 will be described in this order.
The upper frame 30 is a part formed in a downward U-shape when viewed from the front, and corresponds to a connecting frame. Moreover, in this embodiment, the upper frame 30 is comprised by the metal hollow pipe members. However, it is not limited to this, The upper frame 30 may be comprised with the solid member. Further, as shown in FIG. 2, the upper frame 30 includes a horizontal portion 31 as a first extending portion extending in the width direction, and a second extending portion positioned on both sides of the horizontal portion 31 in the width direction. And a downwardly extending portion 32. Each downward extending portion 32 extends downward toward the side frame 10, and the lower end portion 32 a is joined to the upper portion of the side frame 10.

In addition, the part (henceforth skew part 32b) located below the lower end part 32a among the downward extension parts 32 is skewed so that it may spread outward in the width direction as it goes below. As shown in FIGS. 2 and 3, a connecting plate 33 extending in the width direction is installed between the lower end portions of the skewed portion 32b. Of the connecting plate 33, both ends in the width direction are fixed to the skewed portion 32b by laser welding. Further, both end portions in the width direction of the connecting plate 33 are curved so as to be displaced backward from the portion fixed to the skewed portion 32b toward the inner side in the width direction.

In the upper frame 30, a square cylindrical pillar guide 34 that supports the headrest pillar is attached to the front surface of the horizontal portion 31. A pair of pillar guides 34 are provided at intervals in the width direction. Moreover, the part in which the pillar guide 34 is attached among the horizontal parts 31 is crushed so that the front surface may become a plane. A pillar guide 34 is fixed to a portion that is flattened and flattened.

When the cross section perpendicular to the width direction of the portion where the pillar guide 34 is fixed in the horizontal portion 31 is seen, as shown in FIG. 4, a portion that is raised upward and downward by being crushed (hereinafter referred to as a raised portion). 31a) is formed. In the present embodiment, the pillar guide 34 is fixed using the raised portion 31a. More specifically, the raised portion 31a and the pillar guide 34 are laser welded by irradiating a welding laser from the rear of the raised portion 31a in a state where the front surface of the raised portion 31a and the rear surface of the pillar guide 34 are in contact with each other. Yes. Incidentally, in FIG. 4, the protruding portion 31 a is illustrated somewhat larger than the actual size for easy understanding of the description.

Next, the lower member frame 50 will be described. The lower member frame 50 is formed by processing a sheet metal, and is spanned between lower end portions of the side frames 10 (strictly, between lower end portions of a rear wall portion 14 of an outer part 11 described later). Further, the upper edge portion and the lower edge portion of the lower member frame 50 are each bent forward to form a flange.

Next, the side frame 10 will be described with reference to FIGS. 5A to 5C. 5A is a view showing the side frame 10 according to the present embodiment, and FIGS. 5B and 5C are views showing the respective parts constituting the side frame 10, both of which are viewed from the inner side in the width direction. It is a time figure.

The side frame 10 has a spindle-shaped outer shape when viewed from the side as shown in FIG. 5A. That is, when the side frame 10 is viewed from the side, the front end portion of the side frame 10 bulges out in a circular arc shape from a midway position in the vertical direction. Note that when the seat S is in use (more strictly speaking, when the seat back S1 is at the reference position), the side frame 10 is along a direction slightly inclined (backward inclined) with respect to the vertical direction. It extends for a long time. Incidentally, hereinafter, the extending direction of the side frame 10 is referred to as a “frame extending direction”.

Further, a lower end portion 32 a of the lower extension portion 32 of the upper frame 30 is joined to one end portion (upper end portion) of the side frame 10 in the extension direction. Here, in a state where the lower end portion 32a is joined to the upper end portion of the side frame 10, the extending direction of the downward extending portion 32 substantially coincides with the frame extending direction. In this sense, it can be said that the frame extending direction corresponds to the extending direction of the downward extending portion 32.

In addition, in this seat S, the length of the part joined to the upper end part of the side frame 10 among the lower end parts 32a of the downward extension part 32 is shortened compared with the conventional vehicle seat. This is to make the seat S lighter than the conventional vehicle seat. In the present embodiment, the thickness of the steel plate constituting the side frame 10 is smaller than the thickness of the pipe constituting the upper frame 30.

Further, in the present embodiment, the side frame 10 is constituted by a thin steel plate, more specifically, an ultra high strength steel plate having a thickness of 1 mm or less. Furthermore, the side frame 10 according to the present embodiment is configured by joining a plurality of frame pieces, specifically, two frame pieces. More specifically, each side frame 10 includes an outer part 11 illustrated in FIG. 5B and an inner part 12 illustrated in FIG. 5C as components. All of these parts are formed by processing an ultra-high strength steel sheet.

The outer part 11 corresponds to one frame piece among a plurality of frame pieces constituting the side frame 10, and mainly constitutes an outer portion in the width direction in the side frame 10. The inner part 12 corresponds to another frame piece, and mainly configures an inner portion in the width direction in the side frame 10. As shown in FIG. 6, the outer part 11 and the inner part 12 constitute a side frame 10 by being joined by laser welding in a state where a part thereof overlaps. In FIG. 6, the welding marks when laser welding is performed are illustrated by thick broken lines.

Hereinafter, the structure of the side frame 10 will be described in more detail with reference to FIGS. 6 to 10 together with FIGS. 3 and 5A to 5C. First, in describing the structure of the side frame 10, the configuration of each of the outer part 11 and the inner part 12 will be described.

The outer part 11 has a substantially U-shaped cross section intersecting with the frame extending direction, and has a side wall portion 13 and a rear wall portion 14 as shown in FIGS. The side wall part 13 is a part located in the edge part of the width direction outer side in the side frame 10. As shown in FIG. And the end surface of the side wall part 13 prescribes | regulates the end surface of the width direction outer side of the side frame 10. As shown in FIG. That is, the outer shape of the side wall portion 13 corresponds (substantially coincides) with the outer shape of the side frame 10 as can be seen by comparing FIGS. 5A and 5B. Further, the front end portion of the side wall portion 13 includes a flange portion 13a formed by being bent at a substantially right angle toward the inner side in the width direction. The flange portion 13a is formed in a wide range from the middle portion of the side wall portion 13 to the lower end portion in the frame extending direction.

Further, a plurality of rectangular holes and circular holes are formed in the side wall portion 13 as shown in FIG. 5B. In these holes, an end portion of an S spring 60 described later and a webbing attachment clip 70 are inserted and engaged. Details regarding the holes will be described later.

Furthermore, an attachment hole 13b for attaching the reclining device 80 is formed in the lower part of the side wall part 13 as shown in FIG. 5B. A reclining device 80 is attached to the side wall portion 13 so that the reclining shaft 81 passes through the attachment hole 13b. In the present embodiment, a plurality of attachment parts are used for attaching the reclining device 80 to the side wall portion 13. The attachment parts of the reclining device 80 will be described later.

The rear wall portion 14 is a portion provided so as to be substantially orthogonal to the rear end portion of the side wall portion 13, and extends toward the inner side in the width direction as shown in FIG. The rear wall portion 14 extends long in the frame extending direction, and the end positions (upper end position and lower end position) of the rear wall portion 14 in the same direction are substantially aligned with the end position of the side wall portion 13. Moreover, the edge part of the width direction inner side of the rear wall part 14 is equipped with the flange part 14a formed by bending at a substantially right angle toward the front. The flange portion 14a is formed in a wide range from the upper end portion to the lower end portion of the rear wall portion 14 in the frame extending direction. As shown in FIG. 6, the flange portion 14 a is interrupted at a position directly above the lower member frame 50 in the frame extending direction for the convenience of attaching the lower member frame 50 to the lower end portion of the rear wall portion 14.

Further, as shown in FIG. 3, a bead (hereinafter referred to as a rear wall bead 14b) formed along the frame extending direction is formed on the rear surface of the rear wall portion 14. The rear wall bead 14b is provided to improve the rigidity of the rear wall part 14 (particularly, the rigidity against a load acting in the front-rear direction), and the center part in the width direction of the rear wall part 14 is recessed forward. Is formed. In the present embodiment, the rear wall bead 14 b is formed such that its lower end reaches a position directly above the lower member frame 50.

As shown in FIG. 5C, the inner part 12 has a curved shape in accordance with the outer shape of the side frame 10, and has an upper part 15, a part central part 16, and a lower part 17 as shown in FIG. . The part upper part 15 constitutes the upper end part of the inner part 12, and as shown in FIG. 7, the cross section intersecting with the frame extending direction is substantially U-shaped. As shown in FIGS. 6 and 7, the parts upper part 15 constitutes a closed cross-section structure part 10 a of the side frame 10 by being combined and joined to the upper part of the outer part 11. The closed section structure portion 10a will be described in detail later.

The part center part 16 constitutes a part adjacent to the lower end part of the part upper part 15 in the inner part 12 and extends so as to descend obliquely forward from the lower end of the part upper part 15. Moreover, as shown in FIG. 8, the cross section which cross | intersects the frame extension direction of the parts center part 16 has comprised substantially V shape. As shown in FIGS. 6 and 7, the center part 16 of the part constitutes an open cross-section structure part 10b of the side frame 10 by being combined with and joined to the middle part of the outer part 11 in the frame extending direction. ing. Strictly speaking, the part center part 16 is joined to the front end part of the side wall part 13 of the outer part 11, so that the position adjacent to the closed cross-section structure part 10a in the frame extending direction in the open cross-section structure part 10b. This constitutes the adjacent region 10x. The open section structure portion 10b and the adjacent region 10x will be described in detail later.

The part lower portion 17 constitutes a portion of the inner part 12 positioned below the center part 16 of the part, and extends from the lower end of the part center part 16 so as to be curved while being curved in an arc shape. Moreover, as shown in FIG. 9, the cross section which cross | intersects the frame extension direction of the parts lower part 17 has comprised the substantially S shape. The lower part 17 is formed to be somewhat narrower than the upper part 15 in the front-rear direction. As shown in FIGS. 6, 9, and 10, the part lower portion 17 is combined with the lower part of the outer part 11 to constitute an open cross-section structure portion 10 b of the side frame 10. Strictly speaking, the part lower part 17 is joined to the front end part of the side wall part 13 of the outer part 11, so that the part lower part 17 is located at a position separated from the closed cross-section structure part 10a in the frame extending direction in the open cross-section structure part 10b. The existing separation area 10y is configured. In particular, the part lower portion 17 constitutes only the front end portion of the separation region 10 y in the side frame 10. The separation region 10y will be described later in detail.

Next, the structure of the side frame 10 will be described. As shown in FIG. 6, a closed cross-section structure portion 10 a is formed at the upper end portion of the side frame 10. As shown in FIG. 7, the closed cross-section structure portion 10 a is a portion in which a cross section that intersects the frame extending direction has a closed cross-section structure.

And the lower end part 32a of the downward extension part 32 of the upper frame 30 has entered inside the upper end part (one end part in a frame extension direction) of the closed cross-section structure part 10a, and the said lower end part 32a is further closed cross-section structure. It is joined to the part 10a. That is, the end part located in the same side as the downward extension part 32 in the frame extension direction among the side frames 10 comprises the closed cross-section structure part 10a. On the other hand, the downward extending portion 32 enters the inside of the upper end portion of the closed cross-section structure portion 10a and is joined to the upper end portion. As a result, the upper frame 30 is appropriately assembled to the side frame 10, and as a result, the side frames 10 are well connected to each other by the upper frame 30. In the present embodiment, the downward extending portion 32 and the upper end portion of the closed cross-section structure portion 10a are joined together by irradiation with a welding laser from the outside of the upper end portion.

On the other hand, as described above, in the present sheet S, for the purpose of reducing the weight, the length (hereinafter, the joining length) of the portion of the downward extending portion 32 that is joined to the upper end portion of the side frame 10 is set. It is shorter than conventional vehicle seats. Here, if the said joining length is shortened, the support rigidity of the side frame 10 will be impaired by that much. Here, the support rigidity of the side frame 10 means the stability of the support state of the side frame 10 when an external force is applied to the side frame 10.

On the other hand, in this embodiment, the upper end part of the side frame 10 to which the downward extension part 32 is joined is the closed cross-section structure part 10a. In this closed section structure portion 10a, the support rigidity is ensured because of the closed section structure. Further, as shown in FIG. 6, the closed cross-section structure portion 10 a extends so that the lower end of the closed cross-section structure portion 10 a is positioned below the lower end of the lower extension portion 32 in the frame extending direction. That is, a portion of the side frame 10 that is located below the downward extension portion 32 (that is, a portion that is not joined to the downward extension portion 32) has a closed cross-section structure portion 10a, thereby supporting rigidity. Is secured.

As described above, in the present embodiment, the upper end portion of the side frame 10 is used as the closed cross-section structure portion 10a, the lower extension portion 32 of the upper frame 30 is joined to the closed cross-section structure portion 10a, and the closed cross-section structure portion is further formed. 10 a is extended below the lower end of the downward extending portion 32. As a result, it is possible to compensate for the support rigidity that is lost by shortening the joining length.

In addition, in this embodiment, as shown in FIG. 7, the closed cross-section structure part 10a is formed by joining the upper part of the outer part 11 and the part upper part 15 of the inner part 12 by the laser welding. Has been. More specifically, in the upper part of the outer part 11, the flange part 14 a of the side wall part 13 and the rear wall part 14 overlaps the part upper part 15 of the inner part 12. The upper part of the outer part 11 and the part upper part 15 of the inner part 12 are joined by irradiating the overlapping part with a welding laser along the frame extending direction. As described above, if the two parts are overlapped to form the closed cross-section structure portion 10a, the strength of the closed cross-section structure portion 10a can be further increased, and the support rigidity of the side frame 10 can be further ensured.

In this embodiment, the thickness of the steel plate constituting the side frame 10 is smaller than the thickness of the pipe constituting the upper frame 30. Thereby, even if the closed length structure portion 10a is extended below the lower end of the downward extending portion 32 while the joining length is shortened, an increase in the weight of the side frame 10 is suppressed (specifically, the conventional product) Can be made lighter).

Incidentally, if the entire side frame 10 has a closed cross-sectional structure, the weight of the side frame 10 increases accordingly. For this reason, in this embodiment, only the upper end part of the side frame 10 is set as the closed cross-section structure part 10a, and the part located below it is set as the open cross-section structure part 10b. Here, the open cross-section structure portion 10b is a portion in the side frame 10 that is continuous with the closed cross-section structure portion 10a in the frame extending direction and has a cross section that intersects the frame extending direction. That is, in the open cross-section structure portion 10b, as shown in FIGS. 8 and 9, a gap Q is formed by interruption of a continuous portion in the cross section.

As described above, in the present embodiment, only the upper end portion of the side frame 10 is the closed cross-section structure portion 10a, so that the supporting rigidity of the side frame 10 is ensured and the weight of the seat back frame F1 including the side frame 10 is further increased. It is possible to reduce the weight.

Furthermore, in the present embodiment, the open cross-section structure portion 10b includes an adjacent region 10x located at a position adjacent to the closed cross-section structure portion 10a in the frame extending direction, and a separation region located at a position away from the closed cross-section structure portion 10a. And 10y.

The adjacent region 10x is a region adjacent to the lower end portion (the other end portion in the frame extending direction) of the closed cross-section structure portion 10a in the open cross-section structure portion 10b. The adjacent region 10x is configured by joining by laser welding in a state where the central portion of the outer part 11 and the part central portion 16 of the inner part 12 overlap each other in the frame extending direction. More specifically, the flange portion 13 a of the side wall portion 13 of the central portion of the outer part 11 overlaps the part central portion 16 of the inner part 12. By irradiating the overlapping laser beam along the frame extending direction with respect to the overlapping portion, the central portion of the outer part 11 and the part central portion 16 of the inner part 12 are joined. An adjacent region 10x is formed by the central portion of the joined outer part 11 and the part central portion 16 of the inner part 12.

Further, as shown in FIG. 8, the adjacent region 10 x has a pair of end portions 10 s and 10 t located at positions adjacent to the gap Q among the continuous portions in the cross section. Further, as shown in FIG. 8, each of the pair of end portions 10s and 10t included in the adjacent region 10x extends so that the respective leading ends thereof are directed to the gap Q in the cross section.

The separation region 10y is a region located below the adjacent region 10x in the open section structure portion 10b. The separation region 10y is configured by joining the lower part of the outer part 11 in the frame extending direction and the part lower part 17 of the inner part 12 by laser welding in an overlapping state. More specifically, in the lower part of the outer part 11, the flange part 13 a of the side wall part 13 overlaps the part lower part 17 of the inner part 12. The overlapping part is irradiated with a welding laser along the frame extending direction, whereby the lower part of the outer part 11 and the part lower part 17 of the inner part 12 are joined. A separated region 10 y is formed by the lower part of the joined outer part 11 and the lower part 17 of the inner part 12.

Further, as shown in FIG. 9, the separation region 10 y has a pair of end portions 10 s and 10 t located at positions adjacent to the gap Q among the continuous portions in the cross section. Of the pair of end portions 10s, 10t included in the separation region 10y, the end portion 10s located on the front side is folded back in the front-rear direction as shown in FIG. That is, the end portion 10s located on the front side has two portions that overlap in the width direction (hereinafter, overlapping portions 10v and 10w). As described above, in the present embodiment, the strength of the open cross-section structure portion 10b including the separation region 10y is increased by folding back the end portion 10s located on the front side of the pair of end portions 10s and 10t included in the separation region 10y. It has been.

In the present embodiment, among the pair of end portions 10s and 10t included in the separation region 10y, the end portion 10s positioned on the front side is folded back. However, the present invention is not limited to this, and the rear side portion is closer to the rear side. It is good also as turning up the edge part 10t located.

Furthermore, as shown in FIG. 9, the end portion 10s located further forward forms a closed space C by joining the two overlapping portions 10v and 10w. More specifically, the end portion 10s positioned on the front side is folded back in the front-rear direction as described above, but is folded back in a bag shape particularly in the present embodiment. That is, in the folded back end portion 10s, the region at the rear is narrower than the region at the front, and the overlapping portions 10v and 10w are in contact with each other. The two overlapping portions 10v and 10w are joined by irradiating the two overlapping portions 10v and 10w in contact with each other with a laser for welding. As a result, the end portion 10s located on the front side forms a closed space C. As described above, in the present embodiment, since the end portion 10s positioned on the front side forms the closed space C, the strength of the open cross-section structure portion 10b including the separation region 10y is further increased.

In joining the two overlapping portions 10v and 10w, a laser for welding is irradiated from the inner side in the width direction (in other words, of the two overlapping portions 10v and 10w, the overlapping portion 10w located on the inner side in the width direction). (Laser is irradiated.)

In the present embodiment, the two overlapping portions 10v and 10w are joined by laser welding, and the end portion 10s located on the front side forms the closed space C. However, the present invention is limited to this. It is not something. As shown in FIG. 11, the two overlapping portions 10v and 10w may be separated from each other with a space therebetween (that is, a configuration in which the end portion 10s located on the front side is not closed).

By the way, in this embodiment, as shown in FIG. 6, the opening degree of the cross section in the adjacent region 10x of the open cross section structure portion 10b becomes larger toward the lower side. In other words, the pair of end portions 10s and 10t included in the adjacent region 10x are separated so as to be away from the closed cross-section structure portion 10a in the frame extending direction, and a larger gap Q is separated. Further, in this embodiment, as can be seen by comparing FIGS. 8 and 9, the gap Q (that is, the degree of opening of the cross section) in the cross section of the open cross section structure portion 10b is larger in the separated area 10y than in the adjacent area 10x. ing. With such a configuration, it is possible to suppress a sudden change in the cross-sectional shape at the boundary portion between the closed cross-section structure portion 10a and the open cross-section structure portion 10b. Thereby, it is possible to suppress a reduction in rigidity and stress concentration of the side frame 10 due to a sudden change in the cross-sectional shape.

Furthermore, as described above, the gap Q in the adjacent region 10x gradually increases as the gap Q is away from the closed cross-section structure portion 10a in the frame extending direction. Thereby, it becomes possible to more effectively suppress a sudden change in the cross-sectional shape at the boundary portion between the closed cross-section structure portion 10a and the open cross-section structure portion 10b.

The structure of the side frame 10 according to the present embodiment will be described in more detail. As shown in FIG. 5A, the length of the adjacent region 10x in the frame extending direction is shorter than the length of the closed cross-section structure portion 10a in the same direction. ing. That is, in the present embodiment, the adjacent region 10x having a lower rigidity than the closed cross-section structure portion 10a is configured to be shorter than the closed cross-section structure portion 10a in the frame extending direction. Thereby, in this embodiment, compared with the case where the adjacent area | region 10x is comprised so that it may become longer than the closed cross-section structure part 10a, the side frame 10 is more rigid.

Further, as shown in FIGS. 2, 3 and 7, the side frame 10 has a recess formed by being recessed inward in the width direction. This recessed part is formed in the side wall part 13 of the outer part 11 which comprises the side frame 10, more specifically, the center part of the side wall part 13 in a flame | frame extension direction, and the part equivalent to a lower half. As described above, in the present embodiment, the strength of the side frame 10 is increased by providing the recesses in the side wall portion 13. Note that the number of recesses provided in the side wall part 13 and the locations where the recesses are provided are not particularly limited.

Incidentally, of the recesses formed in the side frame 10, the recess formed in the central portion of the side wall portion 13 (hereinafter referred to as the first recess 20) is a substantially triangular recess when viewed from the side. Further, as can be seen by comparing FIGS. 5A, 5B and 5C, the first recess 20 is such that the upper end of the first recess 20 is positioned above the lower end of the closed cross-section structure portion 10a in the side frame 10. Is provided.

By the way, when the concave portion is provided in the side frame 10, the section modulus of the portion where the concave portion is provided is reduced, and particularly, the portion is significantly changed in the portion where the upper end of the concave portion is located. On the other hand, in this embodiment, the part in which the upper end of the 1st recessed part 20 is located in the side frame 10 becomes the closed cross-section structure part 10a. With such a configuration, it is possible to suppress a decrease in the section modulus in the portion of the side frame 10 where the upper end of the first recess 20 is located.

Of the recesses formed in the side frame 10, a recess (hereinafter referred to as a second recess 21) formed in the lower half of the side wall portion 13 is an outer surface of the side wall portion 13 (surface outward in the width direction). Surface). Here, a part of the second concave portion 21 forms an end portion 10s positioned on the front side of the pair of end portions 10s and 10t included in the separation region 10y. Strictly speaking, of the two overlapping portions 10v and 10w formed by folding the end portion 10s, the overlapping portion 10v positioned on the outer side in the width direction is, as shown in FIG. Located in.

And the overlapping portion 10v located in the second recess 21 is joined to the overlapping portion 10w facing this by laser welding. As described above, in the present embodiment, one of the two overlapping portions 10v and 10w to be joined is located within the range where the strength of the second recess 21, that is, the side frame 10, is increased. Thereby, it becomes possible to ensure the joining strength when joining the two overlapping portions 10v and 10w by laser welding. Here, the joining strength means the stability of both contact states at the stage of joining the two overlapping portions 10v and 10w.

Further, the lower half of the side wall portion 13 of the side frame 10 has a floating island-shaped bead portion (hereinafter referred to as a convex bead) surrounded by a second concave portion 21 as shown in FIGS. 22) is formed. The convex bead 22 corresponds to a reinforcing portion, and is provided at the lower end portion of the side frame 10 so that the rigidity of the side frame 10 (particularly, the rigidity with respect to the load input from the occupant to the upper portion of the seat back S1 at the time of a vehicle rear-end collision ) Is provided. Moreover, the convex bead 22 is formed by raising a predetermined part in the side frame 10 toward the outside, and is formed so as to extend linearly in the front-rear direction in this embodiment.

In addition, the convex bead 22 is good to be formed so that the position of each part of the bead may be lowered toward the rear end. More preferably, the convex bead 22 is formed so as to extend in a direction along the input direction of the load input to the upper portion of the seat back S1 at the time of the rear collision of the vehicle. Moreover, in this embodiment, the convex bead 22 is formed at the same height as the end portion 10s on the folded side of the pair of end portions 10s, 10t included in the separation region 10y. More precisely, the formation position of the convex bead 22 is substantially the same as the two overlapping portions (overlapping portions 10v, 10w) in the folded end portion 10s in the frame extending direction. With such a positional relationship, in the present embodiment, the strength of the side frame 10 is effectively increased by combining the folding of the end 10 s and the formation of the convex beads 22.

Further, the convex bead 22 is not limited to the configuration provided in the side wall portion 13, and may be provided in the rear wall portion 14 as shown in FIG. When the configuration illustrated in FIG. 11 is described, a weakened portion 23 is formed along the width direction at the lower end portion of the rear wall portion 14. The fragile portion 23 is a portion that becomes a deformation base point when the side frame 10 is bent due to an impact load of a predetermined size or more applied at the time of rearward collision of the vehicle, and includes a hole portion, a concave portion, and the like. In addition, the weak part 23 is provided in the back position rather than the convex bead 22 provided in the side wall part 13. More specifically, as shown in FIG. 11, it may be formed at a position straddling the boundary portion (corner portion) between the side wall portion 13 and the rear wall portion 14. In the above configuration, when the second convex bead 22 extending in the direction intersecting the fragile portion 23 is provided in a portion of the rear wall portion 14 located above or below the fragile portion 23. Good.

<< About the S spring mounting position on the side frame >>
As shown in FIGS. 2 and 3, the seat back frame F <b> 1 according to the present embodiment includes an S spring 60 that is installed between the side frames 10 in the width direction. On the other hand, the S spring 60 extends while meandering in the vertical direction along the width direction. Further, the end portion of the S spring 60 in the extending direction is hooked in an engagement hole 13 x formed in the side wall portion 13 of the outer part 11 in the side frame 10. Thereby, the S spring 60 is attached to the side frame 10.

Here, the position where the engagement hole 13x is formed will be described. As can be seen by comparing FIGS. 5A and 5C, the engagement hole 13x is formed at the same position as the adjacent region 10x in the frame extending direction. Further, the engagement hole 13x is formed between a pair of end portions 10s and 10t included in the adjacent region 10x in the front-rear direction. That is, in the present embodiment, the attachment position of the S spring 60 is the same position as the adjacent region 10x in the frame extending direction, and is a position away from the pair of end portions 10s and 10t included in the adjacent region 10x. Yes. Due to such a positional relationship, in the present embodiment, the S spring 60 is appropriately attached to the side frame 10 so as not to interfere with the pair of end portions 10s, 10t of the adjacent region 10x.

<< About the attachment position of the bundling attachment clip on the side frame >>
In the seat back frame F1 according to the present embodiment, a webbing attachment clip 70 illustrated in FIG. 10 is attached to the side frame 10 closer to the door of the vehicle. The baffle attachment clip 70 corresponds to a baffle attachment member and is a component for attaching a baffle of an airbag (not shown). On the other hand, in the side frame 10, rectangular insertion holes 13 y and 13 z for inserting the bundling attachment clips 70 are formed in the side wall portion 13 of the outer part 11. Then, as shown in FIG. 10, the webbing attachment clip 70 is attached to the side frame 10 by inserting a part of the webbing attachment clip 70 into the insertion holes 13 y and 13 z.

In this embodiment, as shown in FIG. 5B, two insertion holes 13y and 13z are formed at different positions in the frame extending direction. Hereinafter, the formation positions of the respective insertion holes 13y and 13z will be described. In the following, the insertion hole 13y positioned higher in the frame extending direction is referred to as “upper insertion hole 13y”, and the insertion hole 13z positioned lower is referred to as “lower insertion hole 13z”. .

The upper insertion hole 13y is formed at the same position as the adjacent region 10x in the frame extending direction, as can be seen by comparing FIGS. 5A and 5B. Further, the upper insertion hole 13y is formed at a position shifted from each of the pair of end portions 10s, 10t of the adjacent region 10x in the width direction. More specifically, the upper insertion hole 13y is formed at a position facing the front end 10s in the width direction of the pair of end portions 10s and 10t of the adjacent region 10x. That is, in the present embodiment, the attachment position of the bundling attachment clip 70 inserted into the upper insertion hole 13y is the same position as the adjacent region 10x in the frame extending direction, and a pair of end portions included in the adjacent region 10x The position is away from 10s and 10t. Due to such a positional relationship, in this embodiment, the webbing attachment clip 70 is appropriately attached to the side frame 10 so as not to interfere with the pair of end portions 10s and 10t included in the adjacent region 10x. In addition, a space is formed on the inner side in the width direction of the end portion 10s located on the front side of the pair of end portions 10s and 10t included in the adjacent region. In the present embodiment, the webbing attachment clip 70 is attached using such space effectively.

In the present embodiment, as shown in FIG. 5B, the upper insertion hole 13y is a portion of the side wall portion 13 where the above-described recesses (the first recess 20 and the second recess 21) are not formed, That is, it is formed in a portion (non-recessed portion) located more outward in the width direction. Moreover, in this embodiment, the upper insertion hole 13y is located ahead of the engagement hole 13x formed for attaching the S spring 60, as shown in FIG. 5B. In other words, in the seat back frame F <b> 1 according to the present embodiment, the S spring 60 is disposed behind the baffle attachment clip 70 that is inserted into the upper insertion hole 13 y.

As shown in FIG. 5A and FIG. 5B, the lower insertion hole 13z is formed at the same position as the separation region 10y in the frame extending direction. Further, the lower insertion hole 13z is formed in the vicinity of the folded back end portion (that is, the end portion 10s located on the front side) of the pair of end portions 10s, 10t of the separation region 10y. Yes. More specifically, as shown in FIG. 10, the end portion 10s has two portions (overlapping portions 10v and 10w) that are overlapped in the width direction when folded. On the other hand, the lower insertion hole 13z is formed behind the inner overlapping portion 10w of the two portions 10v and 10w. More specifically, as shown in FIG. 5A, the lower insertion hole 13z is formed immediately behind the inner overlapping portion 10w. Further, in the present embodiment, a portion of the inner overlapping portion 10w located immediately before the lower insertion hole 13z is cut away to form a relief portion 10u as shown in FIG. . The escape portion 10u is a portion formed to cross the bundling attachment clip 70 at the inner overlapping portion.

That is, in the present embodiment, the attachment position of the bundling attachment clip 70 inserted into the lower insertion hole 13z is the same position as the separation region 10y in the frame extending direction, and one end portion of the separation region 10y has In 10 s, the position is away from the overlapping portion 10 w located on the inner side in the width direction. Due to such a positional relationship, in this embodiment, the webbing attachment clip 70 is appropriately attached to the side frame 10 so as not to interfere with the overlapping portion 10w.

Further, the baffle attachment clip 70 to be inserted into the lower insertion hole 13z is attached to the peripheral position of the overlapping portion 10w in the side frame 10. On the other hand, a notch-shaped escape portion 10u is formed in the overlapping portion 10w. This makes it possible to more effectively avoid interference with the overlapping portion 10w when attaching the bundling attachment clip 70 to be inserted into the lower insertion hole 13z to the side frame 10.

In the present embodiment, of the pair of end portions 10s and 10t included in the separation region 10y, the folded end portion 10s is relatively short for the purpose of avoiding interference with the bundling attachment clip 70. ing. Further, the end portion 10s forms a closed space C by joining two overlapping portions 10v and 10w, but the above-described relief portion 10u is formed in the vicinity of the lower insertion hole 13z. As shown in FIG. 10, the closed space C is not opened. However, the present invention is not limited to this, and the formation position of the lower insertion hole 13z is shifted rearward from the position shown in FIG. 10, and the closed space C is formed in the vicinity of the lower insertion hole 13z. There may be.

Further, in the present embodiment, the lower insertion hole 13z is a non-recessed portion in which the above-described recesses (first recess 20 and second recess 21) are not formed in the side wall portion 13 as shown in FIG. 5B. Is formed.

<< Installation of reclining device >>
In the present embodiment, the reclining device 80 is attached to the lower end portion of the seat back frame F <b> 1, more specifically, to the lower end portion of the side wall portion 13 of the outer part 11 constituting the side frame 10. More specifically, a mounting hole 13b for mounting the reclining device 80 is formed at the lower end of the side wall 13. As shown in FIG. 13, the mounting hole 13b has a substantially inverted keyhole shape when viewed from the side. That is, the lower part of the mounting hole 13b is circular, and the upper part is substantially rectangular.

In the present embodiment, the first bracket 82 is interposed between the side wall 13 and the reclining device 80 in the width direction, and the reclining device 80 is attached to the side wall 13 via the first bracket 82. Yes. The first bracket 82 is made of a relatively thick steel plate, and as shown in FIG. 13, includes a substantially inverted keyhole-shaped base portion 82a and a protruding portion 82b protruding outward in the width direction from the upper end portion of the base portion 82a. Have. One end of the spiral spring 85 is locked to the overhanging portion 82b. That is, the urging force by the spiral spring 85 directly acts on the overhanging portion 82b.

The base portion 82a is composed of a ring-shaped lower portion and a rectangular frame-shaped upper portion, and is welded to the outer surface (surface facing the width direction outer side) of the side wall portion 13. More specifically, by irradiating a welding laser from the inner side in the width direction than the side wall part 13 with the base part 82a in contact with the edge part of the mounting hole 13b among the outer side surfaces of the side wall part 13, the base part is obtained. 82 a is welded to the outer surface of the side wall portion 13. At the time of laser irradiation, the laser is irradiated along the outer edge of the substantially inverted keyhole type attachment hole 13b. Thereby, compared with the case where a laser is irradiated in simple circle shape, it becomes possible to raise welding strength. Further, when the laser is irradiated as described above, it is possible to perform welding at a position away from the reclining shaft 81 as compared with the case where the laser is irradiated in a simple circular shape. Further, by irradiating the laser as described above, the upper end portion of the base portion 82a is welded. As a result, the welding strength at the upper end of the base portion 82 a provided with the overhang portion 82 b is increased, and the support state of the overhang portion 82 b that receives the biasing force from the spiral spring 85 can be stabilized.

Further, a reclining device 80 (strictly, a casing of the reclining device 80) is welded to a surface of the base portion 82a that is located on the opposite side to the side wall portion 13. Further, the spiral spring 85 is disposed outside the reclining device 80 in the width direction. Furthermore, in the present embodiment, the second bracket 83 and the third bracket 84 are interposed between the reclining device 80 and the spiral spring 85 in the width direction.

The second bracket 83 is joined (welded) to the reclining device 80 on the side opposite to the first bracket 82. As shown in FIG. 13, the second bracket 83 is formed with a circular hole 83a. A portion of the reclining shaft 81 that protrudes outward in the width direction from the casing of the reclining device 80 is inserted into the through-hole 83a.

As shown in FIG. 13, the third bracket 84 has a ring-shaped base portion 84a and a protruding portion 84b protruding outward in the width direction from the upper end portion of the base portion 84a. The base portion 84a is welded to the outer surface of the second bracket 83 (the surface opposite to the side on which the reclining device 80 is welded). More specifically, a welding laser is irradiated from the outer side in the width direction than the second bracket 83 in a state where the base portion 84a is in contact with the edge portion of the through hole 83a in the outer surface of the second bracket 83. By doing so, the base portion 84 a is welded to the outer surface of the second bracket 83. The other end portion of the spiral spring 85 is locked to the projecting portion 82b. One end of the spiral spring 85 is locked to the protruding portion 82b of the first bracket 82, and the other end is locked to the protruding portion 84b of the third bracket 84, so that the seat back S1 is moved forward. Is energized.

With the configuration described above, in the present embodiment, the reclining device 80 is appropriately attached to the side frame 10 made of a relatively thin steel material.

Second Embodiment
Next, a vehicle seat according to a second embodiment of the present invention will be described with reference to FIGS.
The present embodiment is a vehicle seat provided with a height link device, and a side frame disposed on the left and right sides of the cushion frame has a closed cross-sectional structure at its lower end, and the outer wall of the closed cross-sectional structure The present invention relates to an invention of a vehicle seat characterized in that the portion is configured to form a curved shape, and the closed cross-sectional structure extends back and forth so as to pass through a position overlapping with a brake unit in the vertical direction. .
Further, the present embodiment is a vehicle seat provided with a rail device that supports the seat body so as to be movable back and forth, and includes a connection bracket for connecting the cushion frame and the upper rail, and the connection bracket and the upper rail are vertically contacted. A weld mark is formed by laser welding the outer peripheral part of the contacted part from both sides in the sheet width direction, and the weld mark extends along the outer surface in the sheet width direction of the outer peripheral part. And a second welded portion extending along the inner side surface in the seat width direction. The present invention relates to a vehicle seat invention.

As shown in FIG. 14, the vehicle seat S of the present embodiment has a seat body including a seat cushion 101 and a seat back 102, and as shown in FIG. 15, the seat back 102 is rotated with respect to the seat cushion 101. A reclining device 120 that is movably connected, a height link device 130 that connects the seat body to the vehicle body floor to be movable up and down, and a rail device 140 that is attached to the vehicle body floor and supports the seat body so as to be movable back and forth. It is mainly composed.
The rail device 140 corresponds to a base member in the claims.

As shown in FIG. 14, the seat cushion 101 is a seating portion that supports an occupant from below, and a cushion pad 101a is placed on a cushion frame 110 shown in FIG. 15 that is a skeleton and is covered with a skin material 101b. It is configured.
The seat back 102 is a backrest portion that supports the back of the occupant from the back, and is configured by placing a cushion pad 102a on a back frame serving as a skeleton and covering with a skin material 102b.

As shown in FIG. 15, the cushion frame 110 is formed of a substantially rectangular frame that is a skeleton of the seat cushion 101, and the cushion side frame 111 disposed on the left and right sides and the front portion of each cushion side frame 111. The plate-like pan frame 112 for connecting the two, the pipe-like rear connection frame 113 for connecting the rear portions of the cushion side frames 111, and the pan frame 112 and the rear connection frame 113 are hooked and extended in a snake shape. It is mainly composed of three elastic springs 114 and a submarine pipe 115 disposed below the pan frame 112 and connecting the cushion side frames 111.
The cushion side frame 111 is a sheet metal member that extends in the front-rear direction of the seat and has a substantially I-shaped vertical cross section. A reclining device 120 is attached to the rear portion of the cushion side frame 111, and a height link device 130 is attached to the lower portion thereof. The rail device 140 is attached.
Details of the cushion side frame 111 and the pan frame 112 will be described later.

As shown in FIG. 15, the reclining device 120 can be switched between a locked state in which the rotation operation of the seat back 102 is locked and an unlocked state, and the seat back 102 is locked in a standing posture. The device is capable of releasing the lock state and adjusting the standing posture of the seat back 102 by operating a lycra operation lever (not shown).
More specifically, the reclining device 120 is attached to the rear portion of the seat cushion 101 and biases the back rotation shaft 121 serving as a rotation center and the seat back 102 to rotate forward about the back rotation shaft 121. The spiral spring 122 is mainly composed of.
The back rotating shaft 121 is pivotally supported on the seat cushion 101 side and the seat back 102 side in the seat width direction, and one end of the spiral spring 122 is locked on the seat cushion 101 side, and the other end is on the seat back 102 side. It is locked to.

As shown in FIGS. 15 to 17, the height link device 130 is attached between the cushion frame 110 and the rail device 140, and is disposed on the left and right first links 131 disposed on the front side of the seat and on the rear side of the seat. The right and left second links 132 are provided, and the second link 132 serves as a drive link to adjust the height of the seat body.
Of the second link 132, in the coupling portion on the cushion frame 110 (cushion side frame 111) side, a sector gear portion 132a is formed as a gear on a part of the outer peripheral portion, as shown in FIG. It is meshed with a pinion gear 132b provided on the left and right inner sides of a brake unit 134 to be described later.

Further, as shown in FIGS. 16 and 17, the height link device 130 is pivotally supported on the side surface in the seat width direction of the cushion side frame 111 and protrudes outwardly via a brake rotation shaft 133 and a brake rotation shaft 133. A brake unit 134 that is pivotably attached and restricts the lifting and lowering operation of the seat body; a height operation lever 135 that is pivotally attached via the brake rotating shaft 133 and the brake unit 134 and moves the seat body up and down; It has.
The brake unit 134 is attached to the outer surface of the cushion side frame 111 via a mounting bracket 136. The attachment bracket 136 is attached to the cushion side frame 111 by a first attachment member 136a and a second attachment member 136b that are positioned to sandwich the brake unit 134 in the front-rear direction of the seat.

In the above configuration, when the height operation lever 135 is operated, the pinion gear 132b rotates integrally with the brake rotating shaft 133, and the meshing position of the pinion gear 132b and the sector gear portion 132a changes. Further, the second link 132 on the left side where the sector gear portion 132a is formed rotates, and the second link 132 on the right side and the first link 131 on the left and right also rotate following the second link 132 on the left side. As a result, the seat body moves up and down and the seat height is adjusted.

As shown in FIGS. 15 and 16, the rail device 140 is fixed to the vehicle floor and extends left and right lower rails 141 that extend in the front-rear direction of the seat, and left and right upper rails 142 that are slidably supported along the lower rails 141. It mainly comprises a lock member (not shown) that locks the upper rail 142 so as not to slide, and a rail operation lever 143 that releases the lock state of the lock member.
The lower rail 141 is formed of a long hollow body, and is disposed on the left and right sides with an interval in the seat width direction, and an accommodation space having a substantially convex cross section is formed along the front-rear direction of the seat.
The upper rail 142 is formed of a long body that slides along the lower rail 141 in a state where the upper rail 142 is inserted into the accommodation space of the lower rail 141. As shown in FIG. It is connected to the side.

As shown in FIGS. 15 and 16, the connecting bracket 150 is made of a sheet metal member having a substantially L-shaped longitudinal section extending in the front-rear direction of the seat, and includes an upper rail 142 and a link 131 on the cushion frame 110 side in the vertical direction. 132 is a member for connecting to 132.
Details of the connection bracket 150 will be described later.

<Details of side frame>
As shown in FIGS. 16 to 18, the cushion side frame 111 includes a first side frame portion 210 having a substantially I-shaped cross section and a cross section attached to the inner side surface in the seat width direction at the lower end portion of the first side frame portion 210. The second side frame portion 220 having a substantially L shape is mainly configured. Then, the first side frame portion 210 and the second side frame portion 220 are overlapped to form a substantially rectangular closed cross-sectional structure.

The first side frame portion 210 has its upper end portion 211 bent and extended inward in the seat width direction as a flange portion, and its lower end portion 212 bent as an outer side opposite to the upper end portion 211 as a flange portion. It is configured to extend.
The upper end portion 211 has a substantially U-shaped cross section, and is bent so as to return to the inner side in the seat width direction after protruding from the main body wall portion 210a of the first side frame portion 210 to the outer side in the seat width direction, It protrudes so as to project inside.
As shown in FIG. 16, the upper end portion 211 extends in the seat front-rear direction and extends from a position where the reclining device 120 is attached to the cushion side frame 111 to a position where the pan frame 112 is attached.
Further, as shown in FIG. 17, the upper end portion 211 protrudes to the inner side in the sheet width direction and protrudes to a position covering the second link 132.

As shown in FIGS. 17 and 18, the lower end portion 212 has a substantially U-shaped cross section, and protrudes from the main body wall portion 210 a to the outside in the sheet width direction, and then returns to the inside in the sheet width direction. And protrudes to a position where it does not overhang in the sheet width direction.
More specifically, the lower end portion 212 includes an upper wall portion 212a, an outer wall portion 212b, and a bottom wall portion 212c that are successively formed from the main body wall portion 210a.

As shown in FIG. 16, the lower end portion 212 extends in the front-rear direction of the seat and extends from the rear end portion of the cushion side frame 111 to a position overlapping with the pan frame 112 in the vertical direction.
Further, the lower end portion 212 protrudes outward in the seat width direction and protrudes to a position where it overlaps with at least a part of the brake unit 134 in the vertical direction.

As shown in FIGS. 17 and 18, the second side frame part 220 is bent from the inner wall part 220 a superimposed on the main body wall part 210 a of the first side frame part 210 and the lower end part of the inner wall part 220 a. The bottom wall portion 220b protrudes outward in the seat width direction and overlaps the bottom wall portion 212c of the first side frame portion 210.

In the above configuration, the lower end portion of the cushion side frame 111 forms a closed cross-sectional structure by the first side frame portion 210 and the second side frame portion 220.
The portion having the closed cross-sectional structure of the cushion side frame 111 is configured such that the outer wall portion 212b forms a curved surface shape.
Specifically, the portion having the closed cross-sectional structure is configured to form a continuous curved shape with the outer wall portion 212b, the upper wall portion 212a, and the bottom wall portion 212c.

In the above configuration, as shown in FIGS. 16 and 17, the portion having the closed cross-sectional structure of the cushion side frame 111 is arranged at a position overlapping with the brake unit 134 and extends along the outer peripheral portion of the brake unit 134. It extends in the front-rear direction so as to be bent.
Further, the portion having the closed cross-sectional structure extends in the front-rear direction so as to pass through a position overlapping with the portion where the first attachment member 136a and the second attachment member 136b are arranged.
Therefore, in the vehicle seat S with the height link device 130, the rigidity can be increased at the lower end portion of the brake unit 134 in the cushion side frame 111 where the load is relatively easily concentrated.

In the above configuration, as shown in FIG. 16, the cushion side frame 111 has a shape that becomes narrow in the vertical direction between the attachment position of the first link 131 and the attachment position of the second link 132 in the seat front-rear direction. ing.
And the part which has the closed cross-section structure of the cushion side frame 111 is extended from the position between the brake unit 134 and the back connection frame 113 to the position of the said narrow part.
Therefore, the rigidity around the brake unit 134 can be ensured while reducing the weight of the seat in the portion of the cushion side frame 111 that does not require special strength.

In the above configuration, as shown in FIG. 16, the cushion side frame 111 has a substantially cylindrical protruding hole 111a protruding outward in the seat width direction at a portion connected to the submarine pipe 115. The submarine pipe 115 is laser welded in a state where the submarine pipe 115 is fitted in the protruding hole 111a. Therefore, the connection rigidity with the submarine pipe 115 is improved.

In the above configuration, as shown in FIG. 16, the second link 132 is offset from the first link 131 on the inner side in the sheet width direction.
In general, in the seat with the height link device 130, the height operation lever 135 is connected to the height operation lever 135 via the brake unit 134 so that the height operation lever 135 does not protrude from the seat body to the outside in the seat width direction as much as possible. The two links 132 (drive links) are offsetly arranged on the inner side in the sheet width direction.
In this way, when the link is offset, the joint bracket 150 is required to have a stronger joint strength than usual. If the present configuration adopts laser welding as described above, the joint bracket 150 has a sufficient joint strength. can do.

<Details of pan frame>
As shown in FIGS. 19 and 20, the pan frame 112 is engaged with a pan frame main body 112a made of a metal material, and an engagement body 112b made of a resin material, which is engaged with an engaged hole provided in the pan frame main body 112a. 112c.
The engaging bodies 112b and 112c are formed with a plurality of harness passage holes 112d through which a harness for a known device around the pan frame 112 is passed.
As shown in FIG. 19, the left and right end portions of the pan frame 112 are vertically overlapped with the upper end portion 211 of the cushion side frame 111 and fixed by using blind rivets.

<Second Embodiment of Side Frame>
Next, a second embodiment of the side frame will be described with reference to FIGS.
In addition, the description which overlaps with the cushion side frame 111 mentioned above in the following description is abbreviate | omitted.
The cushion side frame 111 ′ according to the second embodiment is different in that the second side frame portion 220 ′ is attached from the outer side surface in the seat width direction at the lower end portion of the first side frame portion 210 ′.
The first side frame portion 210 'having a substantially I-shaped cross section and the second side frame portion 220' having a substantially U-shaped cross section are overlapped to form a rectangular closed cross-sectional structure.

<Details of connecting bracket>
As shown in FIGS. 23 and 24, the connecting bracket 150 is made of a sheet metal member having a substantially L-shaped vertical cross section, and is a member for connecting the upper rail 142 and the links 131 and 132.
The connecting bracket 150 continuously extends from the bottom wall portion 151 contacting the upper surface of the upper rail 142 and the inner end portion in the left-right direction of the bottom wall portion 151, and the links 131 and 132 are rotatably attached. Main wall portion 152 and a front wall portion 153 that extends continuously upward from the front end portion of bottom wall portion 151 and is also connected to the front end portion of side wall portion 152.
The bottom wall portion 151 corresponds to a contact portion that contacts the upper surface (contacted portion) of the upper rail 142 in the claims.

The bottom wall portion 151 extends along the upper rail 142, and is provided on the outer surface in the sheet width direction with a predetermined interval, and is a notch 151 a cut out toward the inner side in the sheet width direction. A plurality of are formed.
The notch 151a is a portion that is cut out in a substantially rectangular shape, and extends inward in the seat width direction within a range that does not reach the center of the upper rail 142 in the seat width direction. Further, it is disposed between the first link 131 and the second link 132 in the front-rear direction of the seat.
The bottom wall portion 151 is joined on the upper rail 142 by laser welding the outer peripheral portion of the portion where the bottom surface and the upper surface of the upper rail 142 are in contact with each other.
More specifically, the outer peripheral portion is laser-welded from the outside and the inside in the sheet width direction, so that welding marks 160 are formed on both the bottom wall portion 151 and the upper surface of the upper rail 142.

The side wall portion 152 extends in the front-rear direction along the bottom wall portion 151, and moves away from the bottom wall portion 151 in the seat width direction from the portion where the first link 131 is attached toward the portion where the second link 132 is attached. It is bent in the direction.
Further, in the side wall portion 152, between the first link 131 and the second link 132, an upper end flange 152a extending in the front-rear direction of the seat and a harness for a known device in the rail device 140 or its periphery are passed. A harness passage hole 152b is formed.
The upper end flange 152a and the harness passage hole 152b are formed at positions facing the notch 151a in the seat front-rear direction.

A reinforcing wall portion 154 extending upward from the bottom wall portion 151 toward the side wall portion 152 is formed at a portion where the bottom wall portion 151 and a portion to which the second link 132 is attached in the side wall portion 152 are connected.
The reinforcing wall portion 154 is inclined upward from the bottom wall portion 151 toward the side wall portion 152, and specifically, at an angle of about 15 to 45 degrees, preferably about 30 degrees with respect to the bottom wall portion. Inclined upward.
The reinforcing wall portion 154 is formed with a reinforcing convex portion 154a raised upward. The reinforcing protrusions 154a extend from a portion connected to the bottom wall portion 151 to a portion connected to the side wall portion 152 in the reinforcing wall portion 154, and are formed in a plurality at a predetermined interval in the seat front-rear direction.

As shown in FIGS. 23 to 26, the welding mark 160 is formed by laser welding a part of the outer peripheral portion of the portion where the bottom wall portion 151 and the upper surface of the upper rail 142 are in contact with each other.
The welding mark 160 includes a first welded portion 161 extending along the outer side surface in the sheet width direction and a second welded portion 162 extending along the inner side surface in the sheet width direction in the outer peripheral portion. I have.
The first welded portion 161 extends along the outer surface including the notch 151a in the outer peripheral portion of the bottom wall portion 151. More specifically, the first welded portion 161 extends so as to be discontinuous at the position of the notch 151a. .
The second welded portion 162 extends continuously along the inner surface of the outer peripheral portion of the bottom wall portion 151.

In the above configuration, the first welded portion 161 and the second welded portion 162 are formed by laser welding from the outside and the inside in the sheet width direction, respectively.
Therefore, the welding operation can be performed from a position where a space is relatively easily secured.

In the above configuration, as shown in FIGS. 23 and 24, the second link 132 is arranged at a position inside the sheet width direction with respect to the first link 131 (offset arrangement).
In general, in the seat with the height link device 130, the height operation lever 135 is connected to the height operation lever 135 via the brake unit 134 so that the height operation lever 135 does not protrude from the seat body to the outside in the seat width direction as much as possible. The two links 132 (drive links) are offsetly arranged on the inner side in the sheet width direction.
In this way, when the link is offset, the joint bracket 150 is required to have a stronger joint strength than usual. If the present configuration adopts laser welding as described above, the joint bracket 150 has a sufficient joint strength. can do.

Further, in the above configuration, the connection bracket 150 is formed with a reinforcing wall portion 154 having an inclined shape as a chamfered portion corresponding to the offset arrangement of the second link 132.
In general, when laser welding is attempted from the inner side in the sheet width direction, a portion of the connecting bracket 150 that protrudes toward the second link 132 obstructs and it is difficult to appropriately perform laser irradiation. However, if it is the structure of this invention, the part which becomes obstructive when irradiating a laser with the reinforcement wall part 154 can be avoided.
Specifically, when the target part is irradiated with the laser, a part of it is reflected and rebounds, so it is necessary to avoid placing components in the area where the reflected laser passes. If it is the structure of the connection bracket 150, the operation | work of a laser welding can be performed suitably.

<Other embodiments>
In the above embodiment, as shown in FIG. 22, the vehicle seat S includes the height link device 130 and the rail device 140, but is not necessarily required, for example, a base fixed to the vehicle body floor The member and the cushion frame 110 (cushion side frame 111) may be directly connected.

In the above embodiment, as shown in FIG. 23, the vehicle seat S has a configuration including the height link device 130, but is not necessarily required, and the cushion frame 110 (cushion side frame 111) and the connection bracket 150 are not necessarily required. May be directly connected.
Further, instead of the connection bracket 150, a connection portion may be integrally provided at the lower end portion of the cushion side frame 111, and the connection portion and the upper rail 142 may be connected.

In the above embodiment, the connecting bracket 150 is attached on the upper rail by laser welding, but is not particularly limited to laser welding, and various welding methods such as arc welding and spot welding are employed. Also good.

In the above embodiment, as shown in FIG. 23, the connection bracket 150 is joined on the upper rail 142 by laser welding the outer peripheral portion of the portion in contact with the upper rail 142 from both sides in the seat width direction. The direction and location of laser welding can be changed without any particular limitation.
For example, the outer peripheral portion may be laser welded only from the outside in the sheet width direction, or may be laser welded only from the front side of the sheet.
When the outer peripheral portion is laser-welded only from the outside in the sheet width direction, the welding mark 160 is formed only in the first welded portion 161.
At this time, the welding location of the first welded portion 161 is also arbitrary. For example, when the notch 151a is not formed, the first welded portion 161 continuously extends along the outer surface of the outer peripheral portion. It may be extended or may be discontinuously extending with a gap. For example, even when the notch 151a is formed, the first welded portion 161 may extend continuously along the outer surface including the entire circumference of the notch 151a.

In the above-described embodiment, as shown in FIG. 23, the welding portion 160 is formed on both the connection bracket 150 and the upper rail 142 by laser welding the outer peripheral portion of the portion where the connection bracket 150 and the upper rail 142 abut. However, the weld mark 160 is not necessarily formed on both.
In general, since the connecting bracket 150 is thicker than the upper rail 142, the upper rail 142 may be hardly affected by heat by laser welding to a position slightly approaching the connecting bracket 150 at the contact portions. it can. At this time, the welding mark 160 is greatly formed on the connection bracket 150.

In the above-described embodiment, a vehicle seat used for an automobile has been described as a specific example. can do.

In the present embodiment, the vehicle seat according to the present invention has been mainly described.
However, said embodiment is only an example for making an understanding of this invention easy, and does not limit this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes the equivalents thereof.

10 Side frame (back side frame)
10a Closed section structure part 10b Open section structure part 10s, 10t End part 10v, 10w Overlapping part (two parts)
10u Escape part 10x Adjacent area 10y Separation area 11 Outer part 12 Inner part 13 Side wall part 13a Flange part 13b Mounting hole 13x Engagement hole 13y, 13z Insertion hole 14 Rear wall part 14a Flange part 14b Rear wall bead 15 Parts upper part 16 parts Center part 17 Parts lower part 20 First recess (recess)
21 Second recess (recess)
22 Convex bead 23 Weak part 30 Upper frame (connection frame)
31 Horizontal part (first extension part)
31a Bump 32 Lower extension (second extension)
32a Lower end portion 32b Skew portion 33 Connecting plate 34 Pillar guide 50 Lower member frame 60 S spring (support member)
70 Force cloth attachment clip (force cloth attachment member)
80 reclining device 81 reclining shaft 82 first bracket 82a base 82b overhang 83 second bracket 83a through hole 84 third bracket 84a base 84b overhang 85 spiral spring C closed space F1 seat back frame F2 seat cushion frame Q gap RL Lower rail RU Upper rail S This seat (vehicle seat)
S1 Seat back S2 Seat cushion S3 Headrest P Pad material W Skin material XL Rotating link 101 Seat cushion 101a, 102a, Cushion pad 101b, 102b, Skin material 102 Seat back 110 Cushion frame 111, 111 'Cushion side frame 111a Projection hole 112 Pan frame 112a Pan frame main body 112b, 112c Engagement body 112d Harness passage hole 113 Rear connection frame 114 Elastic spring 115 Submarine pipe 120 Reclining device 121 Back rotating shaft 122 Spiral spring 130 Height link device 131 First link 132 Second link (drive link) )
132a Sector gear portion 132b Pinion gear 133 Brake rotation shaft 134 Brake unit 135 Height operation lever 136 Mounting bracket 136a First mounting member 136b Second mounting member 140 Rail device 141 Lower rail 142 Upper rail 143 Rail operation lever 150 Connecting bracket 151 Bottom wall ( Contact part)
151a Notch 52 Side wall part 52a Upper end flange 52b Harness passage hole 153 Front wall part 154 Reinforcement wall part 154a Reinforcement convex part 160 Welding mark 161 First weld part 162 Second weld part 210, 210 'First side frame part 210a Main body wall Part 211 upper end part 212 lower end part 212a upper wall part 212b outer wall part 212c bottom wall part 220, 220 'second side frame part 220a inner wall part 220b bottom wall part

Claims (15)

1. A seat frame having side frames provided at both ends in the width direction of a vehicle seat,
   The side frame is
   A closed cross-section structure portion having one end portion in the extending direction of the side frame, and a cross section intersecting with the extending direction being a closed cross-sectional structure;
   A portion that is continuous with the closed cross-section structure portion in the extending direction, and an open cross-section structure portion in which the cross-section is an open cross-section structure,
   A gap formed by discontinuation of a continuous portion in the cross section of the open cross-section structure portion is located adjacent to the closed cross-section structure portion in the extending direction in the open cross-section structure portion. A seat frame that is larger than a region in a separation region located at a position away from the closed cross-section structure portion in the extending direction.
2. 2. The seat frame according to claim 1, wherein the gap in the adjacent region becomes larger as the distance from the closed cross-section structure portion increases in the extending direction.
3. The separation region has a pair of end portions located at positions adjacent to the gap among the continuous portions in the cross section,
   At least one of the pair of end portions of the separation region has two portions that are overlapped in the width direction by being folded, and a closed space is formed by joining the two portions. The seat frame according to claim 1, wherein:
4. A connecting frame for connecting the side frames;
   The connection frame includes a first extension portion extending in the width direction, a second extension portion positioned on both sides of the first extension portion in the width direction and extending toward the side frame, With
   The second extension part enters inside one end part in the extension direction of the closed cross-section structure part,
   The seat frame according to claim 1, wherein the adjacent region is adjacent to the other end portion in the extending direction of the closed cross-section structure portion.
5. 5. The portion of the second extending portion that enters the inside of one end portion in the extending direction of the closed cross-section structure portion is joined to the closed cross-section structure portion. Seat frame.
6. The seat frame according to claim 3, wherein a length of the adjacent region in the extending direction is shorter than a length of the closed cross-section structure portion in the extending direction.
7. The adjacent region has a pair of end portions located at positions adjacent to the gap among the continuous portions in the cross section,
   A support member installed between the side frames in the width direction to support an occupant is attached to the side frame,
   The mounting position of the support member is the same position as the adjacent area in the extending direction, and is a position away from the pair of end portions of the adjacent area. Seat frame.
8. The side frame is a back side frame serving as a skeleton of a backrest part,
   It has a cushion frame that becomes the skeleton of the seating part,
   The cushion frame is disposed on the left and right sides in the seat width direction and has a cushion side frame extending in the seat front-rear direction.
   The cushion side frame has a closed cross-sectional structure in at least one of an upper part and a lower part of the cushion side frame,
   The portion having the closed cross-sectional structure is configured such that at least one side wall portion of the outer side wall portion and the inner side wall portion in the seat width direction forms a curved surface shape. Seat frame.
9. The part having the closed cross-sectional structure is configured such that the one side wall part and the upper wall part and the bottom wall part respectively connected to the one side wall part form a continuous curved surface shape. The seat frame according to claim 8.
10. The seat frame according to claim 8, wherein a lower end portion of the cushion side frame is a portion having the closed cross-sectional structure, and the outer wall portion is formed in a curved shape.
11. The cushion side frame is a second side frame attached to a side surface in the seat width direction of the first side frame portion in order to form the closed cross-sectional structure with the first side frame portion and the first side frame portion. The seat frame according to claim 8, further comprising: a portion.
12. A cushion frame that serves as the skeleton of the seat;
    A lower rail mounted on the vehicle body floor and extending in a predetermined direction; an upper rail which is slidably mounted along the lower rail and supports the cushion frame;
    A connection bracket mounted on the upper rail to connect the upper rail and the cushion frame;
    The connection bracket has a contact portion that contacts a contacted portion provided on the upper rail,
    By welding the outer peripheral part of the part where the contact part and the contacted part are in contact, a welding mark is formed on at least one of the contact part and the contacted part,
    The seat frame according to claim 1, wherein the welding mark extends along the outer peripheral portion.
13. The abutting portion abuts against the abutted portion in the vertical direction,
    The seat frame according to claim 12, wherein the connecting bracket is mounted on the upper rail by laser welding the outer peripheral portion from at least one side in the seat width direction.
14. The welding mark includes a first welded portion extending along an outer side surface in the sheet width direction and a second welded portion extending along an inner side surface in the sheet width direction in the outer peripheral portion. The seat frame according to claim 12, wherein:
15. A cutout is formed in a part of the outer peripheral portion in the contact portion,
    The seat frame according to claim 12, wherein the welding mark extends along the outer peripheral portion including the cutout.

Images