JP2013252727A - Vehicle seat frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcing structure capable of effectively preventing bending deformation of a cross-sectional shape, in a vehicle seat frame.SOLUTION: A seat back frame 10 (vehicle seat frame) includes a pair of right and left side frames 11 and is configured such that each of the side frames 11 is formed to have a cross-sectional shape including a side surface part 11A facing a seat width direction and a rear surface part 11C bent from the side surface part 11A to the seat inside. The seat back frame 10 includes a bridging frame 13 that is provided stretched over in the seat width direction between the respective side frames 11 and integrally connects the respective side frames 11 to each other. The bridging frame 13 is provided integrally joined to each of the side surface part 11A and the rear surface part 11C respectively formed in each of the side frames 11, and is configured to allow the bridging frame 13 to prevent movement of being bent in a bending direction which is generated between the side surface part 11A and the rear surface part 11C.

Description

  The present invention relates to a vehicle seat frame. Specifically, the vehicle seat includes a pair of left and right side frames, and at least one of the side frames has a cross-sectional shape including a side surface portion facing the surface in the seat width direction and a bent surface portion bent from the side surface portion to the seat inner side. Regarding the frame.

  Conventionally, in a vehicle seat, a side frame of a seat back is formed by being bent into a shape having a side surface portion facing the outside of the seat and a rear surface portion facing the rear side of the seat by a pressed material of a thin steel plate. Is known (Patent Document 1). Since the side frame is made of a thin steel plate material, in order to increase its structural strength, an L-shaped plate serving as a reinforcing plate is assigned to the inner corner portion between the side surface portion and the rear surface portion and coupled. It is configured.

JP-A-11-32865

  However, in the above prior art, since the L-shaped plate is also a weak structure made of a pressed material of a thin steel plate, a large load is input to the seat back, and the side frame has a corner portion between the side surface portion and the rear surface portion. Is further bent, the L-shaped plate is also pushed and easily bent and deformed together, and a sufficient reinforcing function is not obtained. The present invention was devised as a solution to the above problems, and the problem to be solved by the present invention is to provide a vehicle seat frame with a reinforcing structure capable of effectively preventing bending deformation of a cross-sectional shape. There is to provide.

In order to solve the above problems, the vehicle seat frame of the present invention takes the following means.
The first invention is provided with a pair of left and right side frames, and at least one of the side frames has a cross-sectional shape including a side surface portion facing the surface in the seat width direction and a bent surface portion bent from the side surface portion to the seat inner side. It is a vehicle seat frame. The vehicle seat frame is provided so as to be bridged in the seat width direction between a pair of left and right side frames, and includes a bridging frame that integrally connects the side frames. The bridging frame is integrally coupled to at least one of the side surface portion and the bent surface portion formed on the at least one side frame, and is in a state of being in contact with or close to the other surface portion. The bridge frame is configured to prevent movement that is bent in the bending direction between the one surface portion and the other surface portion by the bridging frame.

  According to the first aspect of the present invention, the bridge frame is provided in the above-described manner between the side surface portion and the bent surface portion that are bent with respect to each other, whereby the deformation that is bent in the bending direction that occurs between the one surface portion and the other surface portion. Movement is prevented. Since the bridge frame has a structure with high structural strength that connects the side frames together, the above deformation can be received with a strong force. Therefore, a reinforcing structure capable of effectively preventing the bending deformation of the cross-sectional shape of the vehicle seat frame can be obtained by utilizing the configuration of the bridge frame.

  According to a second invention, in the first invention described above, the bridging frame is provided in a state of being integrally coupled to the side surface portion and the bent surface portion.

  According to the second aspect of the present invention, the force for preventing the deformation movement by the bridging frame is further enhanced, and the bending deformation of the vehicle seat frame can be more effectively prevented.

  According to a third invention, in the first or second invention described above, the bridging frame is provided in a state of being integrally joined through the side surface portion.

  According to the third aspect of the present invention, the bridging frame is allowed to contact the side surface portion without considering the positional deviation in the seat width direction with respect to the side surface portion of the bridging frame by adopting a configuration in which the bridging frame penetrates the side surface portion. Can be easily combined.

1 is a perspective view illustrating a schematic configuration of a vehicle seat frame according to Embodiment 1. FIG. It is the disassembled perspective view which removed and showed the bridge | crosslinking frame from the vehicle seat frame. It is the III-III sectional view taken on the line of FIG. FIG. 6 is a cross-sectional view illustrating a main configuration of a vehicle seat frame according to a second embodiment. FIG. 6 is a cross-sectional view illustrating a main configuration of a vehicle seat frame according to a third embodiment.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the configuration of the “vehicle seat frame” according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the “vehicle seat frame” of the present embodiment is configured as a seat back frame 10 that forms a skeleton of a seat back 2 of a vehicle seat 1 configured as a passenger seat of an automobile. Here, the vehicle seat 1 includes a seat back 2 that serves as a backrest for a seated occupant, a seat cushion 3 that serves as a seating portion, and a headrest 4 that serves as a headresting portion.

  The seat back 2 has a disc-shaped reclining device 5 that functions as a rotating shaft device whose lower end portions on both the left and right sides can be prevented from rotating with respect to the rear end portions of the left and right sides of the seat cushion 3, respectively. Connected to each other. Thus, the seat back 2 is connected to the seat cushion 3 so that the backrest angle can be adjusted. Specifically, each reclining device 5 includes lower end portions of both left and right side frames 11 of the seat back frame 10 constituting the skeleton of the seat back 2 and both left and right side frames 31 of the seat cushion frame 30 constituting the skeleton of the seat cushion 3. And the rear end of the two are connected to each other so as to be relatively rotated about the same axis.

  Each of the reclining devices 5 described above is normally held in a locked state in which the backrest angle of the seat back 2 is fixed, and is lifted by a release lever 6 provided on the side of the seat cushion 3 outside the vehicle. The lock state of is released. Specifically, each reclining device 5 is connected so that operation shafts (not shown) inserted through the center portions thereof can be rotated integrally with each other by a connecting rod 6A. 6 is pulled up and the operating shaft on the outside of the vehicle is turned in the releasing operation direction, so that the operating shaft on the inside of the vehicle is also turned together in the releasing operation direction, and the locked state of both reclining devices 5 is released simultaneously. It has come to be.

  By the release operation, each reclining device 5 is switched to a state in which the backrest angle of the seat back 2 can be freely changed in the front-rear direction. Then, after the backrest angle of the seat back 2 is adjusted to a desired angle position, the operation of the release lever 6 is stopped, whereby each reclining device 5 is returned to the locked state again, and the backrest angle of the seat back 2 is increased. Is returned to the fixed state at the adjusted angular position. Since the basic structure of each reclining device 5 has the same known configuration as that disclosed in the literature such as Japanese Patent Application Laid-Open No. 2011-116303, a specific description will be omitted.

  Here, spiral springs 7 that apply a biasing force in the direction of rotating the seat back 2 to the front side of the seat at all times are hooked on the left and right sides between the seat back 2 and the seat cushion 3. Yes. The seat back 2 is lifted up to a position where the seat back 2 hits the back of the seated occupant by releasing the fixed state of the backrest angle by the urging force of the spiral spring 7, and the back of the seated occupant is tilted back and forth. Accordingly, the position of the backrest angle is changed so that the operation of adjusting the backrest angle of the seat back 2 can be easily performed.

  The seat cushion 3 is provided on the floor of the vehicle via a pair of left and right slide devices (not shown), and is provided in a state in which the front-rear position relative to the floor can be adjusted. Since the basic structure of these slide devices is the same as that disclosed in the literature such as Japanese Patent Application Laid-Open No. 2010-221935, detailed description thereof will be omitted. The headrest 4 is formed by the shape of the upper region of the seat back 2.

  By the way, the seat back frame 10 which constitutes the skeleton of the seat back 2 described above is configured by a pressed steel plate material in which a thin steel plate and a steel pipe material are optimally combined in order to reduce the weight. The seat back frame 10 configured as described above is configured so that, even when a load due to normal use such that the back of the seated occupant leans against the seat back 2 receives a load due to its structural strength, the input load is a stable force. It is supposed to be accepted.

  However, the seat back frame 10 itself has a large size such that a rear collision of the vehicle occurs and the back of the seated occupant is pressed against the seat back 2 with a strong force exceeding the load during normal use described above. When a load is input, stress concentrates on a fragile part consisting of a part of the bent cross-sectional shape, and the fragile part promotes deformation in such a way that the bent shape of the fold is further advanced. Therefore, the structure strength is weak. Therefore, in the present embodiment, even if a large load as described above is applied to the seat back frame 10, a reinforcing structure (a reinforcing structure by a bridge frame 13 described later) is configured to widely disperse this load. ) Is provided.

  Hereinafter, the configuration of the seat back frame 10 and the reinforcing structure will be described in detail. As shown in FIGS. 1 and 2, the seat back frame 10 is bent in a mountain shape provided between a side frame 11 made of a pair of left and right vertically elongated steel plates and the upper end portions of the side frames 11. The upper frame 12 is made of a steel pipe material of the shape formed, and the bridge frame 13 is made of a horizontally long steel pipe material provided between the lower portions of the side frames 11. Here, each side frame 11 corresponds to a “side frame” of the present invention, and the bridge frame 13 corresponds to a “bridge frame” of the present invention. Each side frame 11 is cut into a vertically long shape by pressing a sheet of steel plate, and then bent into a flange shape so that the front edge portion and the rear edge portion are bent inside the seat. Is formed.

  Accordingly, each side frame 11 has a side surface portion 11A that faces in the seat width direction, a front surface portion 11B that is bent inward from the front edge portion of the side surface portion 11A and faces the front side of the seat, and the side surface portion 11A. And a rear surface portion 11C which is bent from the rear edge portion toward the inner side of the sheet and faces toward the rear side of the sheet. Here, the side surface portion 11A corresponds to the “side surface portion” of the present invention, and the rear surface portion 11C corresponds to the “bending surface portion” of the present invention. The front surface portion 11B and the rear surface portion 11C are formed by being bent at an angle of approximately 90 degrees from the side surface portion 11A to the inside of the sheet. Each side frame 11 has a configuration in which each side frame 11 has a rounded shape in which the front edge and the rear edge of the side surface portion 11A are not angular with respect to the outside by pressing, and safety is improved. It has become.

  Further, each side frame 11 is formed such that an intermediate portion thereof is bent into an arcuate shape on the rear side of the seat. As a result, each side frame 11 is formed at both side positions of the waist of the seated occupant so that the shape of the side frame 11 protrudes to the front side of the seat, and the side support that supports the waist of the seated occupant from both outsides. It is set as the structure which can set a part large, or can strongly support a waist | hip | lumbar part in the position of the seat front side. Further, each side frame 11 has a shape warped to the rear side of the seat as described above, so that a wider knee space where an occupant sitting in the rear seat can throw out his / her foot forward can be secured. It has a configuration.

  The upper frame 12 is formed by bending one steel pipe material into the mountain shape by press working. The upper frame 12 is in a state of being firmly and integrally coupled to each side frame 11 by attaching the end portions on both sides to the upper end portion of each side frame 11 and welding them. . The bridging frame 13 is formed of a steel pipe having a circular cross section that extends straight in the seat width direction. The bridging frame 13 is bridged between the lower portions of the side frames 11 described above and is firmly and integrally welded thereto. It is provided as a state.

  In detail, as shown in FIG. 2, the bridging frame 13 is formed in each of the round hole-shaped penetrating holes in the plate thickness direction (sheet width direction) formed in the lower region of the side surface portion 11 </ b> A of each side frame 11 described above. They are inserted into the holes 11A1, respectively, and are provided in a state of being integrally coupled to the outer peripheral surfaces of the through holes 11A1 by welding (see FIG. 3). As shown in FIGS. 2 to 3, the bridging frame 13 is also applied to each projecting surface portion 11 </ b> C <b> 1 formed by being pushed out from the rear surface portion 11 </ b> C of each side frame 11 to the front side of the seat from the front side of the seat. Thus, they are integrally connected by welding. The reason why each of the protruding surface portions 11C1 is formed by being pushed out from the respective rear surface portions 11C to the front side of the seat is that the edge portion 11C2 on the inner side of the seat of each of the rear surface portions 11C is bent toward the front side of the seat, respectively. This is because it is formed in a shape that is rounded so as not to be angular, and is for securing a space for avoiding interference between the folded portion of the edge 11C2 on the inner side of the sheet and the bridging frame 13. Therefore, when the inner edge portion 11C2 of the rear surface portion 11C of each side frame 11 is not folded forward of the seat, it is not always necessary to provide the protruding surface portion 11C1 as described above. May be directly applied to each rear surface portion 11C and welded.

  The bridge frame 13 has a high structural strength that connects the side frames 11 together. Therefore, by providing the bridging frame 13 having such a high structural strength as a state of being integrally coupled to the inner corner portion between the side surface portion 11A and the rear surface portion 11C of each side frame 11, When the large load described above is input to the seat back frame 10 from the front side of the vehicle, the side surface portion 11A is bent so as to rotate toward the inside of the seat or the outside of the seat from the bending point with the rear surface portion 11C. The deformation movement is prevented by the bridging frame 13 interposed in these inner corners.

  Thus, according to the configuration of the seat back frame 10 (vehicle seat frame) of the present embodiment, the bridge frame 13 is formed in the above-described manner between the side surface portion 11A and the rear surface portion 11C of the side frames 11 that are bent with respect to each other. Is provided, the deformation movement that is bent in the bending direction between the side surface portion 11A and the rear surface portion 11C is prevented. Since the bridge frame 13 has a structure with high structural strength that connects the side frames 11 together, the bridge frame 13 can receive the deformation with a strong force. Therefore, the cross-section of the seat back frame 10 can be obtained without increasing the number of parts by using the configuration of the bridging frame 13 provided as a connecting material for connecting the side frames 11 to secure the structural strength of the seat back frame 10. A reinforcing structure capable of effectively preventing the bending deformation of the shape can be obtained.

  Further, since the bridging frame 13 is provided in a state in which the bridging frame 13 is integrally welded and coupled to the side surface portion 11A and the rear surface portion 11C of each side frame 11, the deformation movement blocking force by the bridging frame 13 is prevented. Further, the bending deformation of the seat back frame 10 can be further effectively prevented. Further, since the bridging frame 13 is provided in a state of being integrally coupled to the side surface portion 11A of each side frame 11, a positional deviation in the sheet width direction with respect to each side surface portion 11A of the bridging frame 13 is considered. Without this, the bridging frame 13 can be brought into contact with each side surface portion 11A and integrally coupled.

  Next, the configuration of the vehicle seat frame (seat back frame 10) according to the second embodiment will be described with reference to FIG. In the present embodiment, portions that are substantially the same in configuration and operation as those of the seat back frame 10 shown in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different configurations are described in detail. I will explain. In this embodiment, as shown in FIG. 4, the bridging frame 13 is positioned close to each side surface portion 11 </ b> A with a slight gap in the sheet width direction between the side frame portions 11 </ b> A of each side frame 11. It is arrange | positioned as the state which faced. Even if the bridging frame 13 is arranged in this way, the side surface 11A of each side frame 11 is bent and deformed to rotate toward the inside of the seat from the bending point with the rear surface 11C. It can be strongly blocked by the bridging frame 13 interposed in the inner corner.

  Next, the configuration of the vehicle seat frame (seat back frame 10) according to the third embodiment will be described with reference to FIG. In the present embodiment, portions that are substantially the same in configuration and operation as those of the seat back frame 10 shown in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different configurations are described in detail. I will explain. In this embodiment, as shown in FIG. 5, the bridging frame 13 is formed of a horizontally long flat plate steel plate material. Similarly to the configuration shown in the first embodiment, the bridging frame 13 penetrates the side surface portion 11A of each side frame 11 and is integrally welded to the side surface portion 11A, and the rear surface portion of each side frame 11 Each protruding surface portion 11C1 formed by being pushed out from 11C to the front side of the seat is also welded and integrally connected. Even if the bridging frame 13 has such a cross-sectional shape, the side surface portion 11A of each side frame 11 is bent so as to rotate toward the inside of the seat or the outside of the seat from the bending point with the rear surface portion 11C. These deformation movements can be strongly prevented by the bridging frame 13 interposed between these inner corners.

  As mentioned above, although embodiment of this invention was described using the three Examples, this invention can be implemented with various forms other than the said Example. For example, the “vehicle seat frame” of the present invention is not limited to the application as the seat back frame 10 as shown in each of the above embodiments, but other skeletons such as the skeleton frame of the seat cushion 3 (seat cushion frame 30). It can also be applied as a part. In addition, the “bridging frame” of the present invention may be provided as long as it is provided so as to be bridged in the seat width direction between the pair of left and right side frames and integrally connects the side frames. The cross-sectional shape and the shape itself extending in the sheet width direction are not limited to specific shapes, and various shapes can be applied. In addition, the “bridge frame” is integrally coupled to at least one of the side surface portion and the bent surface portion formed on at least one side frame and is in contact with or close to the other surface portion. What is necessary is just to provide as a state facing the position, and what kind of coupling | bonding state with respect to the other side frame may be sufficient as it.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 3 Seat cushion 4 Headrest 5 Reclining device 6 Release lever 6A Connecting rod 7 Spiral spring 10 Seat back frame (vehicle seat frame)
11 Side frame (side frame)
11A Side surface (side surface)
11A1 Through-hole 11B Front part 11C Rear surface part (bending surface part)
11C1 Protruding surface 11C2 Edge inside sheet 12 Upper frame 13 Cross-linking frame (cross-linking frame)
30 Seat cushion frame 31 Side frame

Claims (3)

A vehicle seat frame having a pair of left and right side frames, wherein at least one side frame has a cross-sectional shape including a side surface portion facing a surface in the seat width direction and a bent surface portion bent from the side surface portion to the seat inside. There,
Provided between the pair of left and right side frames in the seat width direction, provided with a bridging frame that integrally connects the side frames,
The bridging frame is integrally coupled to at least one of the side surface portion and the bent surface portion formed on the at least one side frame and is in contact with or close to the other surface portion. A vehicle seat provided as a state facing a position, wherein the bridging frame prevents movement in a bending direction generated between the one surface portion and the other surface portion. flame. The vehicle seat frame according to claim 1,
The vehicle seat frame, wherein the bridge frame is provided in a state of being integrally coupled to the side surface portion and the bent surface portion, respectively. The vehicle seat frame according to claim 1 or 2,
The vehicular seat frame, wherein the bridging frame is provided in a state of being integrally coupled through the side surface portion.

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