JP6485216B2 - Seat frame - Google Patents

Description

  The present invention relates to a frame in an occupant seat for mounting on a vehicle such as an automobile, an airplane, a ship, and a train.

  In an automobile seat, a technique has been developed in which a closed cross-section structural material is used for a side frame in a back frame in order to reduce the weight while securing a necessary strength as a skeleton member (see Patent Document 1 below). In such a side frame, a brace material is inserted into the closed cross-section structure material to increase the strength.

JP 2002-283899 A

  However, in the above-mentioned side frame, the closed cross-section structural material is constituted by a combination of two members on the outer side (vehicle compartment outer side) and the inner side (vehicle compartment inner side), and the brace material is sandwiched between the three members so that the three members are integrated. Is structured. In this configuration, it is necessary to securely join the three members in order to ensure strength. Therefore, it is necessary to increase the combined dimensional accuracy of each member so that an extra gap is not formed in the joint portion of each member. That is, in order to join the three members over the entire length of the side frame, each member needs to have high dimensional accuracy, and press forming of such members becomes a factor that hinders productivity.

  In view of such a problem, an object of the present invention is to provide a vehicle seat frame configured by connecting a reinforcing member such as a brace material to a closed cross-section structural material, and deforming the closed cross-section structural material so as to adhere to the reinforcing member. Thus, by combining the two, the reinforcing member is bonded to the closed cross-section structure material without requiring high dimensional accuracy for each component member.

  A first aspect of the present invention is a vehicle seat frame configured by connecting a reinforcing member to a closed cross-section structural material, and the inner circumference or the outer peripheral side of the closed cross-section structural material has an inner circumference of the closed cross-section structural material. A reinforcing member having a concave portion recessed toward the side or the outer peripheral side is provided in an overlapping manner, the closed cross-section structural material is deformed toward the concave portion of the reinforcing member, and at least the closed cross-section structural material and the reinforcing member Part of it is tightly bonded.

  In the first invention, the reinforcing member may be provided on either the inner peripheral side or the outer peripheral side of the closed cross-section structural material. Further, the concave portion of the reinforcing member may be formed continuously in the longitudinal direction of the frame, or may be formed intermittently. Furthermore, the recessed part of a reinforcement member may be provided only in one place, and may be provided in multiple places. Furthermore, the closed cross-section structure material may be integrally formed by extrusion molding, or may be one plate material formed in an annular shape. Furthermore, various methods such as a press using a mold, a press using a fluid pressure, and a process using an electromagnetic force can be used as a method of deforming the closed cross-section structural material toward the recess. Furthermore, the seat frame to which the present invention can be applied can be applied to various parts such as a side frame of a seat back frame, a side frame of a seat cushion frame, and a frame of a headrest.

  According to the first invention, the closed cross-section structural material and the reinforcing member are joined by deforming the closed cross-section structural material toward the recess of the reinforcing member. Therefore, even if the dimensional accuracy of the closed cross-section structural member and the reinforcing member is low, both can be closely bonded and productivity can be enhanced while ensuring the strength of the seat frame.

  According to a second invention, in the first invention, the reinforcing member is inserted on an inner peripheral side of the closed cross-section structural material, and the closed cross-section structural material is directed outwardly toward a recess provided on an outer shape of the reinforcing member. The inner periphery of the closed cross-section structural material is brought into close contact with the outer periphery of the reinforcing member, and both members are coupled.

  According to the second invention, since the portion corresponding to the concave portion of the closed cross-section structural material is deformed toward the concave portion, the remaining circumferential length surrounding the reinforcing member of the closed cross-section structural material is shortened by the amount of deformation, and the closed The inner periphery of the cross-sectional structural material is in close contact with the outer periphery of the reinforcing member. Even if the size of the gap formed between the closed cross-section structural material and the reinforcing member inserted therein varies, the variation in the gap can be absorbed by the degree of deformation of the closed cross-section structural material. Therefore, even if the dimensional accuracy of the closed cross-section structural member and the reinforcing member is low, both can be closely bonded and productivity can be enhanced while ensuring the strength of the seat frame.

  According to a third aspect of the present invention, in the second aspect of the invention, in the state where the closed cross-section structural material is deformed toward the concave portion and the inner periphery of the closed cross-section structural material is in close contact with the outer periphery of the reinforcing member, There is a predetermined gap between the closed cross-section structural material and the deformed closed cross-section structural material, and the clearance is further increased when the inner periphery of the closed cross-section structural material is in close contact with the outer periphery of the reinforcing member. It is a gap generated because the structural material cannot be deformed.

  According to the third invention, there is a variation in the size of the gap between the inner circumference of the closed cross-section structural material and the outer circumference of the reinforcing member, and the closed cross-section structural material is in close contact with the reinforcing member. Even if a variation occurs in the amount of deformation of the closed cross-section structural material required for this, the variation is absorbed by changing the gap between the bottom of the recess and the closed cross-section structural material. Therefore, even if the dimensional accuracy of the closed cross-section structural member and the reinforcing member is low, both can be closely bonded and productivity can be enhanced while ensuring the strength of the seat frame.

  According to a fourth invention, in the second or third invention, the reinforcing member is also formed in a closed cross-sectional structure, and the recesses provided on the outer shape of the reinforcing member are respectively formed on mutually opposing wall surfaces of the closed cross-sectional structure. ing.

  According to the fourth invention, since the reinforcing member has a closed cross-sectional structure, it is possible to reduce the weight while ensuring the strength of the frame. In addition, since the concave portions are provided at two opposing positions, the closed cross-section structural material can be deformed as necessary as a whole and brought into close contact with the reinforcing member without increasing the size of each concave portion.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, there is provided a contact portion that is a portion where the closed cross-section structure material is deformed and an inner periphery of the closed cross-section structure material is in close contact with an outer periphery of the reinforcing member. They are coupled to each other by coupling means.

  In the fifth aspect of the invention, various means such as welding, adhesion, and mechanical coupling can be employed as the coupling means.

  According to the fifth aspect of the present invention, since the close contact portions of the closed cross-section structural material and the reinforcing member are coupled to each other, it is possible to increase the bonding strength particularly in the insertion direction of the reinforcing member into the closed cross-section structural material.

1 is a perspective view of an automobile seat to which a first embodiment of the present invention is applied. It is an expansion disassembled perspective view of the side frame part in the said vehicle seat. It is an expansion perspective view explaining the manufacturing process of the said side frame. It is the IV-IV sectional view taken on the line of FIG. It is explanatory drawing explaining the manufacturing process of the said side frame. It is sectional drawing similar to FIG. 3 which shows the said side frame after completion of manufacture. It is sectional drawing similar to FIG. 6 of the side frame which is 2nd Embodiment of this invention. It is sectional drawing similar to FIG. 6 of the side frame which is 3rd Embodiment of this invention.

  FIG. 1 shows an automotive seat (hereinafter simply referred to as a seat) 1 to which a side frame (corresponding to a seat frame in the present invention) 21 according to a first embodiment of the present invention is applied. FIG. 2 shows the side frame 21 and the like in an enlarged manner. In FIGS. 1 and 2, each direction in a state in which the seat 1 is mounted on an automobile is shown by arrows. In the following description, the description regarding the direction is made based on this direction.

  The seat 1 is composed of a seat cushion 3 that supports the weight of the seated occupant and a seat back 2 that supports the back of the seated occupant from the rear. A supporting headrest 6 is attached. In this case, the angle of the seat back 2 can be adjusted in the front-rear direction with respect to the seat cushion 3.

  FIG. 1 shows a detailed configuration of the back frame 20 of the seat back 2. The back frame 20 is configured by connecting an upper frame 23 between a side frame 21 on the vehicle outer side and a side frame 22 on the vehicle inner side at each upper part. The seat 1 in this case has a configuration in which a seat belt (not shown) is incorporated in the seat 1, and a belt outlet 28 for pulling out the seat belt from the shoulder opening of the seat back 2 to the upper portion of the side frame 21 outside the vehicle. Is provided. Since the seat 1 incorporates a seat belt in this way, the back frame 20 needs to have higher strength than that without a seat belt, and the side frame on the side where the belt outlet 28 is provided. 21 is formed of a closed cross-section structural material with increased strength.

  A bracket 27 for attaching the recliner 4 is provided at the lower end portion of the side frame 21, and the recliner 4 is fixed between the lower arm 31 and the bracket 27 of the cushion frame 30. On the other hand, the recliner 4 is attached to the lower end of the side frame 22 between the lower arm 31 of the cushion frame 30. Each recliner 4 is unlocked by rotating the operation lever 41 so that the angle of the seat back 2 with respect to the seat cushion 3 can be arbitrarily adjusted. The recliners 4 on both the left and right sides are connected by a connecting rod 44, and the operation of unlocking the recliners 4 on both sides is performed simultaneously by operating one operation lever 41.

  As is well known, spiral springs 5 are provided between the side frame 21 and the lower arm 31, and between the side frame 22 and the lower arm 31, respectively, and urge the seat back 2 to tilt forward.

  FIG. 2 shows the side frame 21, the bracket 27, and the recliner 4 extracted and enlarged. As is clear from this, the bracket 27 is configured to be inserted and fixed to the lower end portion of the side frame 21, and is configured by a closed cross-section structure like the side frame 21. In a state where the bracket 27 is inserted into the side frame 21, both are integrated by welding, bonding or rivet connection. The recliner 4 is fixed to the bracket 27 by welding. In this case, the side frame 21 is formed by extruding aluminum, and the bracket 27 is formed by pressing an iron plate. Therefore, it is not necessary to specially weld the recliner 4, which is an iron product, to the bracket 27 and can be manufactured at low cost.

  3 and 4 show a part of the manufacturing process of the side frame 21. The side frame 21 includes a rectangular closed cross-section structural member 210 having a round cross-sectional shape with rounded corners, and a reinforcing member 212 that is inserted inside the side frame 21 and has a cross-sectional cross-section. The reinforcing member 212 is similar in shape to the closed cross-section structural material 210 and has an outer shape slightly smaller than that of the closed cross-section structural material 210 so that it can be inserted into the closed cross-section structural material 210. In addition, the reinforcing member 212 is recessed in a direction in which the opposing wall surfaces in the rectangle approach each other to form a pair of recesses 212a and 212b. In the pair of recesses 212a and 212b, one recess 212a is deeper than the other recess 212b.

  The material of the closed cross-section structural member 210 and the reinforcing member 212 is not limited to aluminum, and iron or the like may be formed in an annular shape. Further, the closed cross-section structural member 210 may have a simple rectangular shape with no rounded corners. Furthermore, the recess depths of the one recess 212a and the other recess 212b may be equal to each other.

  FIG. 5 shows a state in which the wall surface of the closed cross-section structural member 210 facing the recesses 212a and 212b is deformed toward the pair of recesses 212a and 212b in the reinforcing member 212. The deformation process is performed by pressing the closed cross-section structural material 210 with the reinforcing member 212 inserted inside between the upper and lower molds P of the press machine, thereby deforming the deformed portion 211a on the wall surface of the closed cross-section structural material 210, 211b is formed. At this time, the size of the portion of the upper and lower molds P that abuts against the wall surface of the closed cross-section structural material 210 is slightly smaller than the spreading surface of the recesses 212a and 212b of the reinforcing member 212.

  When deformation processing is performed on the closed cross-section structural material 210 by the press machine, the wall surfaces of the closed cross-section structural material 210 facing the recesses 212a and 212b are deformed toward the recesses 212a and 212b. Along with such deformation, the circumferential length surrounding the reinforcing member 212 of the wall surface other than the wall surface facing each of the recesses 212 a and 212 b of the closed cross-section structural member 210 is shortened, and is closely attached to the outer periphery of the reinforcing member 212.

  In this way, with the wall surfaces other than the wall surfaces facing the recesses 212a and 212b of the closed cross-section structural member 210 being in close contact with the outer periphery of the reinforcing member 212, the bottom surfaces of the recesses 212a and 212b and the closed cross-section structural material 210 Predetermined gaps 213a and 213b are formed between the walls facing the recesses 212a and 212b. The gaps 213a and 213b are the size of the gap between the two due to the difference between the inner periphery of the closed cross-section structural member 210 and the outer periphery of the reinforcement member 212 when the reinforcing member 212 is inserted into the closed cross-section structural member 210. In addition, it is determined by the size of each of the recesses 212a and 212b of the reinforcing member 212 (the spread area and the depth of the recess). By forming the predetermined gaps 213a and 213b in this way, when the closed cross-section structural material 210 is pressed, the closed cross-section structural material is taken into account by the die P of the press machine in consideration of the work spring back in the press work. 210 can be largely deformed into the recesses 212a and 212b. Further, even if there is a manufacturing variation in the size of the gap between the reinforcing member 212 and the recesses 212a and 212b of the reinforcing member 212 when the reinforcing member 212 is inserted into the closed cross-section structural member 210, the variation Can be absorbed by changing the gaps 213a and 213b. That is, when the size of the gap between the reinforcing member 212 inserted in the closed cross-section structural material 210 and the size of each of the recesses 212a and 212b of the reinforcing member 212 are relatively large, The amount of deformation of the wall surface facing each of the recesses 212a and 212b is increased to reduce the gaps 213a and 213b. In addition, when the size of the gap between the reinforcing member 212 and the recesses 212a and 212b of the reinforcing member 212 is relatively small when the reinforcing member 212 is inserted into the closed sectional structural material 210, The amount of deformation of the wall surface facing each of the recesses 212a and 212b is reduced to increase the gaps 213a and 213b.

  FIG. 6 shows the side frame 21 including the closed cross-section structural member 211 and the reinforcing member 212 that have been processed and completed as described above. According to the side frame 21, even if the dimensional accuracy of the closed cross-section structural member 211 and the reinforcing member 212 is low, both can be closely bonded and the productivity can be improved while ensuring the strength of the side frame 21. Can do. Further, since the reinforcing member 212 has a closed cross-sectional structure, the weight of the side frame 21 can be reduced while ensuring the strength of the side frame 21. In addition, since the concave portions 212a and 212b are provided at two locations facing the reinforcing member 212, the entire structure of the closed cross-section structural member 211 can be deformed by a necessary amount without increasing the size of the concave portions 212a and 212b. 212.

  FIG. 7 shows a second embodiment of the present invention. The feature of the second embodiment with respect to the first embodiment is that the closed cross-section structural member 211 and the reinforcing member 212 fitted inside thereof are coupled by coupling means. The other points are the same, and the repetitive description of the same parts is omitted.

  In the second embodiment, the coupling means is a rivet 214 and a nail 215. The rivets 214 and the nails 215 are located on both sides of the recesses 212a and 212b, and are provided at the portions where the closed cross-section structural material 211 and the reinforcing member 212 are in close contact. In this case, a pair of rivets 214 are provided facing each other, and only one nail 215 is provided on the opposite side of the rivet 214 across the recesses 212a and 212b. In addition, the kind of these coupling | bonding means, an enforcement place, and the number of enforcement can be determined as needed.

  By providing the rivet 214 and the nail 215 at the close contact portion between the closed cross-section structural member 211 and the reinforcing member 212, the closed cross-section structural member 211 and the reinforcing member 212 are more firmly connected. The coupling strength in the insertion direction inside the cross-section structural member 211 can be increased.

  FIG. 8 shows a third embodiment of the present invention. The feature of the third embodiment with respect to the first embodiment is that the shape of the reinforcing member 212 in the first embodiment is changed to form the reinforcing member 216. The other points are the same, and the repetitive description of the same parts is omitted.

  In the third embodiment, the reinforcing member 216 has an open cross-sectional structure rather than a closed cross-sectional structure like the reinforcing member 212 in the first embodiment. The shape of the reinforcing member 216 is similar to the shape of the reinforcing member 212 in the first embodiment, and an opening 216b is formed by removing a portion corresponding to the recess 212b in the reinforcing member 212 in general. Therefore, the closed cross-section structural material 211 that covers the reinforcing member 216 is the same as the closed cross-section structural material 211 in the first embodiment, and the deformation process performed toward the recess 216a and the opening 216b of the reinforcing member 216 is the same. Has been.

  The function similar to that of the side frame 21 in the first embodiment is also achieved in the side frame 21 of the third embodiment. That is, even when the dimensional accuracy of the closed cross-section structural member 211 and the reinforcing member 216 is low, both can be closely bonded and productivity can be increased while ensuring the strength of the side frame 21.

  As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, in each of the above embodiments, the present invention is applied to an automobile seat, but may be applied to a seat mounted on an airplane, a ship, a train, or the like.

DESCRIPTION OF SYMBOLS 1 Car seat 2 Seat back 3 Seat cushion 4 Recliner 41 Operation lever 5 Spiral spring 6 Headrest 20 Back frame 21, 22 Side frame 210 Closed cross-section structural material 211 Closed cross-section structural material 211a, 211b Deformation part 212, 216 Reinforcement member 212a, 212b, 216a Recess 213a, 213b Clearance 214 Rivet (coupling means)
215 Nail (coupling means)
216b Opening 23 Upper frame 24 Reinforcement pipe 25 Lower pipe 26 Support bracket 27 Bracket 28 Belt outlet 30 Cushion frame 31 Lower arm

Claims (4)

A vehicle seat frame configured by coupling a reinforcing member to a closed cross-section structural material,
On the inner peripheral side of the closed cross-section structural material, a reinforcing member provided with a recess recessed toward the inner peripheral side of the closed cross-section structural material is provided in an overlapping manner,
The closed cross-section structural material is deformed from the outside toward the recess provided on the outer shape of the reinforcement member, and the inner periphery of the closed cross-section structure material is brought into close contact with the outer periphery of the reinforcement member so that both members are coupled. Seat frame. In claim 1 ,
In the state where the closed cross-section structural material is deformed toward the recess and the inner periphery of the closed cross-section structural material is in close contact with the outer periphery of the reinforcing member, the bottom of the recess and the deformed closed cross-section structure material Has a certain gap,
The clearance is a seat frame that is a clearance that occurs because the closed cross-section structural material cannot be further deformed by the inner periphery of the closed cross-section structural material being in close contact with the outer periphery of the reinforcing member. In claim 1 or 2 ,
The reinforcing member is also formed in a closed cross-sectional structure,
The recessed part provided on the external shape of the said reinforcement member is a seat frame respectively formed on the mutually opposing wall surface of a closed cross-section structure. In any of claims 1 to 3 ,
A seat frame in which the closed cross-section structural material is deformed, and a close contact portion, which is a portion where the inner periphery of the closed cross-section structural material is in close contact with the outer periphery of the reinforcing member, is coupled to each other by a coupling means.

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