JP7273287B2 - SEAT FRAME AND MANUFACTURING METHOD THEREOF AND SEAT - Google Patents

Description

TECHNICAL FIELD The present invention relates to a lightweight and highly rigid seat frame, a manufacturing method thereof, and a seat.

In general, a vehicle seat has a seat frame formed by connecting metal pipes by welding or the like (Patent Document 1).

JP 2016-199241 A

By the way, a seat used in a vehicle such as a vehicle is required to be lightweight and have high rigidity. In addition, even in seats other than vehicles, if the seat is lightweight and highly rigid, it is easy to move and convenient to use.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lightweight and highly rigid seat frame, a manufacturing method thereof, and a seat.

Another object of the present invention is to facilitate the design or manufacture of a lightweight and highly rigid seat frame.

The present invention for solving the above-described problems is a seat frame having a seat cushion frame and a seat back frame, wherein at least a part of the seat cushion frame and the seat back frame has an annular network structure portion having a mesh ring shape. have

According to the seat frame having such a configuration, at least a part of the seat frame has the ring-shaped mesh structure, so that the seat frame is lightweight and highly rigid.

In the above-described seat frame, it is desirable that the annular network structure portion has an isotruss structure.

By adopting an iso-truss structure for the annular mesh structure, it is possible to create a lightweight yet highly rigid seat frame.

In the above-described seat frame, a plurality of annular network structure portions may be provided, and each of the annular network structure portions may have a linear axis. In this case, it is desirable to further provide a non-mesh connecting portion that connects the plurality of annular network structure portions.

The annular network structure can be easily designed by forming the annular network structure into a straight pipe shape, that is, by forming the annular network structure into a linear pipe shape. By connecting a plurality of ring-shaped network structure portions with non-mesh connection portions, the linear portions constituting the network can be easily connected to the connection portions, so that the ring-shaped network structure portions can be easily connected to each other. be able to.

The connecting portion may connect the plurality of annular network structure portions in different directions.

According to such a structure, the annular net structure can be formed in a straight pipe shape and bent at the connecting portion, thereby facilitating the design and manufacture of the seat frame.

In the seat frame having the connecting portion described above, it is desirable that another member or other portion apart from the annular network structure and the connecting portion is connected to the connecting portion and not connected to the annular network structure.

According to such a seat frame, other members or other parts can be easily connected to the basic structural part constituted by the annular net structure part and the connecting part.

The annular network structure portion and the connection portion may be formed integrally.

According to such a configuration, the basic structural portion having the annular network structure portion and the connecting portion can be made into an integral high-rigidity member.

The annular network structure and the connecting portion may be made of different materials.

The connecting part may be in the shape of a hollow pipe.

Since the connecting portion has a hollow pipe shape, the annular network structure portions can be easily connected to each other while making the connecting portion lightweight and highly rigid.

The annular network structure portions and the connecting portions may be alternately arranged.

The seat frame described above may further include a first pressure receiving member that is provided on the seat cushion frame or the seat back frame and receives a load from the seated person. In this case, the first pressure receiving member can have a ring portion and a plurality of connecting members extending from the ring portion and connected to the seat back frame or the seat cushion frame.

The connecting member may be connected to the connecting portion.

According to this configuration, the connecting member can be easily connected to the basic structural portion composed of the annular network structure portion and the connecting portion.

The seat frame described above may further include a second pressure receiving member that is provided on the seat cushion frame or the seat back frame and receives a load from the seated person. In this case, the second pressure receiving member may have a net plate shape.

Since the second pressure receiving member has a net-like plate shape, the seat cushion frame or the seat back frame can be reinforced with a lightweight structure and made highly rigid.

In the seat frame described above, the seat cushion frame or the seat back frame may have a cross member extending in the left-right direction. In this case, the second pressure receiving member may have a body portion connected to the cross member, and a reinforcing connection portion extending branching from the body portion toward the side opposite to the occupant and connected to the cross member. good.

In this way, the second pressure receiving member is connected to the occupant side of the cross member and extends in a branched manner toward the side of the cross member opposite to the occupant. The connection between the second pressure receiving member and the cross member can be strengthened.

In the seat frame described above, at least the annular network structure portion may be heat-treated after molding.

According to such a configuration, it is possible to increase the rigidity of the annular network structure portion.

The seat frame described above may further include a first member and a second member that non-separably engages with the first member and is relatively movable with respect to the first member.

According to such a configuration, the first member and the second member can be managed as an integral part, which facilitates parts management during manufacturing.

The manufacturing method of each seat frame described above is characterized in that at least the annular mesh structure is formed by a metal three-dimensional printer.

According to such a manufacturing method, the annular network structure can be easily manufactured.

In the manufacturing method of the seat frame having the first member and the second member, the first member and the second member are desirably molded simultaneously by a three-dimensional metal printer.

According to such a manufacturing method, the first member and the second member can be molded at once, and an assembling process is unnecessary.

Further, the seat may be constructed by including the above-described seat frame, a pad placed on the seat frame, and a skin member covering the pad.

According to the present invention, the seat frame or seat can be made lightweight and highly rigid. In addition, it is possible to facilitate the design and manufacture of a lightweight and highly rigid seat frame or seat.

It is a perspective view of a seat frame. It is a side view (a) of the seat frame with the seat back upright, and a side view (b) of the seat frame with the seat back laid down. It is an exploded perspective view of a seat back frame. They are an enlarged view (a) of a lower cross member and an enlarged view (b) of an isotruss structure. It is a longitudinal cross-sectional view of a headrest guide. 4 is an enlarged cross-sectional view of the slide mechanism; FIG. It is a perspective view (a) of the slide mechanism when the seat back is upright, and a perspective view (b) of the slide mechanism when the seat back is laid down. It is an exploded perspective view of a seat cushion frame. It is the figure (a) which looked at the seat cushion frame from the top, and the center sectional drawing (b) of a seat cushion frame. FIG. 11 is a perspective view for explaining a first modified example of the structure for fixing the pressure receiving member; 10A to 10F are diagrams (a) to (f) for explaining the structure and assembly procedure of a first modified example of the fixing structure of the pressure receiving member; FIG. It is the perspective view (a) explaining the 2nd modification of the fixing structure of a pressure-receiving member, its enlarged view (b), and the figure (c) of the form which made the 2nd modification into a double structure. It is the perspective view (a) explaining the 3rd modification of the fixing structure of a pressure-receiving member, the enlarged view (b) before the assembly|attachment, and the enlarged view (c) after assembly|attachment.

Next, one embodiment of the present invention will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1, the seat ST of the present embodiment includes a seat frame S, a pad 2 (see FIG. 2) made of a urethane cushion or the like placed on the seat frame S, and a skin member 3 covering the pad 2 (see FIG. 2). See FIG. 2). The seat ST is, for example, a vehicle seat applied to a rear seat of an automobile.

The seat frame S includes a seat cushion frame S1 and a seat back frame S2 rotatably coupled to the rear end of the seat cushion frame S1. The seat cushion frame S1 and the seat back frame S2 each have an annular network structure portion having a network ring shape at least in part. The ring-shaped network structure portion referred to in this specification refers to a structure in which a network-like portion has a ring shape (closed cross-sectional structure of a network) in at least one cross section. The annular network structure may be pipe-shaped or bag-shaped, for example.

The seatback frame S2 includes a pair of side frames 110 arranged laterally apart from each other, an upper cross member 120 connecting the upper ends of the pair of side frames 110, and a lower cross member 130 connecting the lower ends of the pair of side frames 110. A frame-shaped basic structural portion is configured with

The seat back frame S2 is composed of a lower frame 10 forming a lower half and an upper frame 20 forming an upper half. The upper frame 20 is rotatably connected to the upper end portion of the lower frame 10 . Specifically, the upper frame 20 is rotatable with respect to the lower frame 10 about the rotation axis X10 in FIG.

The lower frame 10 and the upper frame 20 are provided with first pressure receiving members 60 and 70, respectively, which receive the load from the seated person. A slider 80 is integrally fixed to the first pressure-receiving member 70 of the upper frame 20 so as to be vertically slidably engaged with the fixed rail 90 .

The seat cushion frame S1 is composed of a rear frame 30 forming a rear half and a front frame 40 forming a front half. The rear frame 30 and the front frame 40 are supported by a pair of left and right seat slide rails 50 . Specifically, the seat slide rail 50 has a lower rail 51 extending in the front-rear direction and an upper rail 52 slidably engaged with the lower rail 51 . As is well known, the upper rail 52 can be locked or unlocked with respect to the lower rail 51 by a locking mechanism (not shown). Both the rear frame 30 and the front frame 40 are fixed to the upper rail 52 so that they move together with the upper rail 52 .

As shown in FIG. 2( a ), the lower rail 51 is fixed to the floor F of the automobile by brackets 53 . Also, the fixed rail 90 is fixed to the back panel B of the automobile. By sliding the upper rail 52 forward with respect to the lower rail 51, the seatback frame S2 shown in FIG. It is designed to be able to change to a lying state. At this time, since the lower end of the lower frame 10 moves forward, the angle of the lower frame 10 with respect to the horizontal plane becomes smaller than in the state shown in FIG. 2(a). Then, the upper end of the lower frame 10 moves downward, and the upper frame 20 is pulled by the lower frame 10 and moves downward. The upper frame 20 moves downward together with the slider 80 , and the slider 80 slides downward relative to the fixed rail 90 .

Next, detailed structures of the seatback frame S2 and the seat cushion frame S1 will be described.

As shown in FIG. 3 , the lower frame 10 has a pair of annular net structure portions 12 forming part of the pair of side frames 110 and an annular net structure portion 11 forming part of the lower cross member 130 . are doing. That is, a plurality of annular network structure portions 11 and 12 are provided. Annular network structure portions 11 and 12 have linear axes X2 and X3, respectively.

The lower frame 10 includes a bent pipe 13, which is an example of a non-mesh connecting portion that connects the plurality of annular network structure portions 11 and 12. As shown in FIG. The bent pipe 13 is a hollow pipe bent so that the axes of one end and the other end are at 90 degrees to each other. One end of the bent pipe 13 is connected to the ring-shaped network structure 11 and the other end is connected to the ring-shaped network structure 12 . connected in the correct direction. By connecting the plurality of annular network structure portions 11 and 12 with the bent pipes 13, the annular network structure portions 11 and 12 and the bent pipes 13 are alternately arranged along the longitudinal direction. The annular network structure portions 11 and 12 and the bent pipe 13 are integrally formed.

A connection end portion 14 , a shaft support portion 15 , and a truss bar 16 connecting the connection end portion 14 and the shaft support portion 15 are provided on the annular network structure portion 12 .
The connecting end 14 is a non-mesh pipe closed at one end and connected to the upper end of the annular network structure 12 .
The shaft support portion 15 is made of a plate-shaped metal facing in the left-right direction, and has a shaft support hole 15A penetrating in the left-right direction.
The truss bar 16 is a rod constructed by three-dimensionally joining triangular truss structures with thin metal wires.

The lower frame 10 is provided with a first pressure receiving member 60 that receives the load from the seated person inside the basic structural portion surrounded by the side frames 110 and the lower cross member 130 .
The first pressure receiving member 60 has a ring portion 61 and a plurality of connecting members 62 extending from the ring portion 61 and connected to the lower frame 10 of the seatback frame S2. The plurality of connecting members 62 are connected to the connection end portion 14 and the bent pipe 13 that is the connection portion, and are not connected to the annular network structure portions 11 and 12 . In other words, the connection member 62, which is another member or part other than the annular network structures 11 and 12 and the bent pipe 13 that is the connecting portion, avoids the annular network structures 11 and 12 and connects to the bent pipe 13. It is connected to the connection end 14 . As a result, the connecting member 62 can be easily connected to the basic structural portion composed of the annular network structures 11 and 12 and the bent pipe 13 .

The annular network structure portion 11 includes a central portion 11A, a right portion 11B arranged on the right side of the central portion 11A, and a left portion 11C arranged on the left side of the central portion 11A. The central portion 11A and the right portion 11B are connected by a connection bar 17 extending downward. The central portion 11A and the left side portion 11C are connected by another connecting bar 17 extending downward.

The connecting bar 17 has a pivot hole 17A penetrating from side to side at its lower end (see also FIG. 4(a)).

All the parts forming the lower frame 10, including the first pressure receiving member 60, are made of the same metal material. The whole is integrally formed by a metal three-dimensional printer. Therefore, even a complicated shape can be easily manufactured. In particular, the annular net structures 11 and 12 can be easily manufactured by forming at least the annular net structures 11 and 12 with a three-dimensional metal printer. For example, the annular network structures 11 and 12 may be formed by a three-dimensional metal printer, the other portions may be separately formed, and the annular network structures 11 and 12 may be joined to the other portions by welding or the like. .

Both of the ring-shaped network structure portions 11 and 12 are of an isotrus structure. Here, the iso-truss structure will be described with reference to the annular network structure portion 11 shown enlarged in FIG. 4(b).
As shown in FIG. 4(b), the iso-truss structure is constructed by three-dimensionally joining truss structures in which thin metal wires form triangles. Specifically, the isotruss structure comprises an axial line 111 , a cross line 112 and a pyramid truss 113 .
The axial line 111 is a metal line extending in the axial direction along which the ring-shaped axis X2 extends. A plurality of axial lines 111 are arranged side by side at equal intervals in the circumferential direction of the annular network structure portion 11 . Although the number of axial lines 111 is arbitrary, eight lines are arranged here as an example.

The cross line 112 is made of a metal line crossed in an X shape and connects adjacent axial lines 111 . Each end of the metal wire of cross wire 112 is connected to an adjacent axial wire 111 respectively. A plurality of X-shaped cross lines 112 are arranged at predetermined intervals in the axial direction.

The pyramid truss 113 is a truss structure in which thin lines are arranged at the positions of four ridges converging at the vertices of a pyramid (quadrangular pyramid). A pyramid truss 113 connects adjacent axial lines 111 . Also, the pyramid truss 113 is arranged between adjacent cross lines 112 in the axial direction. The pyramid truss 113 is arranged so as to protrude radially outward from the annular network structures 11 and 12 , and each leg is connected to a connection point between the axial line 111 and the cross line 112 .

By adopting such an iso-truss structure, the lower frame 10 can be made lightweight and highly rigid both in the axial direction and in the bending direction.

Returning to FIG. 3, the upper frame 20 includes a pair of annular network structure portions 21 that form part of the pair of side frames 110, a pair of headrest guides 22, a bent pipe 23, a connection bar 24, and connection ends. 25 , a pivot portion 26 and a truss bar 27 . As with the lower frame 10, the upper frame 20 is entirely formed by a metal three-dimensional printer.

The annular network structure portion 21 has the same isotruss structure as the annular network structure portions 11 and 12 of the lower frame 10 . The annular network structure portion 21 has a linear axis X4 of the annular shape.

The headrest guide 22 consists of a rectangular pipe. As shown in the cross-sectional view of FIG. 5, the headrest guide 22 has three rectangular holes 22A formed in the front wall 22F, and holes 22B and notches 22C formed in the rear wall 22R at positions displaced from the holes 22A. ing.
Returning to FIG. 3, the pair of headrest guides 22 are connected by an X-shaped metal wire 22X.

The bent pipe 23 is a hollow pipe bent so that the axes of one end and the other end are at 90 degrees to each other. One end of the bent pipe 23 is connected to the annular network structure portion 21 . The other end of the bent pipe 23 faces inward in the left-right direction and is closed.

The connection bar 24 is composed of a plurality of metal wires, for example, three metal wires, one end of each metal wire is connected to the other end (left and right inner ends) of the bent pipe 23, and the other end of each metal wire is connected to the headrest. It is connected to guide 22 .

The connection end portion 25 is formed of a non-mesh pipe closed at one end and connected to the lower end of the annular network structure portion 21 .
The shaft support portion 26 is made of a plate-shaped metal facing in the left-right direction, and has a shaft support hole 26A penetrating in the left-right direction. The pivot portion 26 is arranged below the connecting end portion 25 .
The truss bar 27 is a rod configured by three-dimensionally joining triangular truss structures with thin metal wires. The truss bar 27 connects the connection end portion 25 and the pivot portion 26 .

The upper frame 20 is provided with a first pressure receiving member 70 that receives the load from the seated person inside the basic structural portion surrounded by the side frames 110 and the upper cross member 120 .

The first pressure receiving member 70 has a ring portion 71 and a plurality of connecting members 72 extending from the ring portion 71 and connected to the upper frame 20 of the seatback frame S2. The ring portion 71 and each bent pipe 23 are connected by two connecting members 72, respectively. The connecting end portion 25 and the ring portion 71 are connected by one connecting member 72, respectively. The shaft support portion 26 and the ring portion 71 are connected by one connecting member 72, respectively. The X-shaped metal wire 22X and the ring portion 71 are connected by one connecting member 72. As shown in FIG.
The connecting member 72 is connected to a non-mesh portion avoiding the annular network structure portion 21, thereby easily connecting the connecting member 72 to the basic structural portion composed of the annular network structure portion 21, the bent pipes 23, and the like. be able to.

As shown in FIG. 6, the slider 80 has a main body portion 81 and an engaging portion 82 that protrudes rearward from the main body portion 81 and extends vertically. Left and right side surfaces 82A of the engaging portion 82 protrude in a mountain shape.

The fixed rail 90 has a pair of rail bars 91 extending vertically at its left and right ends. The fixed rail 90 is an example of the first member. A pair of rail bars 91 are spaced apart from each other in the left and right direction, and V-shaped grooves 92 are formed in surfaces facing each other. The shape of the groove 92 corresponds to the shape of each side surface 82A of the engaging portion 82, and the engaging portion 82 is engaged between the pair of grooves 92. As shown in FIG. As a result, the slider 80 slides on the rail bar 91 so that the engaging portion 82 slides on the fixed rail 90 as shown in FIG. , and can slide up and down with respect to the fixed rail 90. As shown in FIG. Note that the slider 80 is an example of the second member.
Walls 93 (see FIG. 6) are provided at the upper and lower ends of the pair of rail bars 91 to prevent the engagement portion 82 of the slider 80 from coming off. Therefore, the slider 80 is non-separably engaged with the fixed rail 90 and can move relative to the fixed rail 90 . Since the fixed rail 90 and the slider 80 cannot be separated from each other, they can be managed as an integrated part, which facilitates parts management during manufacturing.

Each part constituting upper frame 20, including first pressure receiving member 70, slider 80 and fixed rail 90, is all made of the same metal material. The whole is integrally formed by a metal three-dimensional printer. That is, the slider 80 and the fixed rail 90 are formed simultaneously by a metal three-dimensional printer. Therefore, even a complicated shape can be easily manufactured. Also, the fixed rail 90 and the slider 80 can be molded at once, eliminating the need for a process of assembling them together.
In particular, the annular net structure 21 can be easily manufactured by forming at least the annular net structure 21 with a three-dimensional metal printer. For example, the annular network structure 21 may be formed by a three-dimensional metal printer, the other portions may be separately formed, and the annular network structure 21 and the other portions may be joined by welding or the like.

In addition, since the holes 22A and 22B are alternately arranged in the front wall 22F and the rear wall 22R of the headrest guide 22, for example, the upper frame 20 can be moved from the rear side to the front side by a three-dimensional metal printer. In the case of laminating and molding in order, the support material 22S for supporting the front wall 22F can be molded through the holes 22B and the cutouts 22C, and the front wall 22F can be supported by the support material 22S.

As shown in FIG. 8, the rear frame 30 of the seat cushion frame S1 includes a pair of side frames 31, a rear cross member 32, a front cross member 33, a second pressure receiving member 35, and a pair of connection bars 37. configured with.

The pair of side frames 31 are arranged to be left and right apart from each other. Each side frame 31 is provided with a fixing portion 31A projecting inward in the left and right direction. A hole 31B penetrating vertically is formed in the fixed portion 31A. As shown in FIG. 9(a), two fixed portions 31A are arranged on each side frame 31 with a space therebetween in the front-rear direction. The side frame 31 is fixed to the upper rail 52 at each fixing portion 31A by, for example, passing bolts through the holes 31B.

Returning to FIG. 8 , the rear cross member 32 is an example of a cross member extending in the left-right direction, and connects the rear end portions of the pair of side frames 31 . The rear cross member 32 has a central portion 32A, a right side portion 32B, and a left side portion 32C, which have an isotruss structure similar to that of the annular network structure portion 11. As shown in FIG. The central portion 32A and the right side portion 32B are connected by a connecting bar 37 that extends upward and is not mesh-like. The central portion 32A and the left portion 32C are connected by another non-mesh connecting bar 37 extending upward.

The front cross member 33 is an example of a cross member extending in the left-right direction, and connects front end portions of the pair of side frames 31 . The front cross member 33 has a laterally long body portion 33A and a right side portion 33B. The body portion 33A and the right side portion 33B are connected by a non-mesh connection block 33X.

The second pressure receiving member 35 is a member that receives a load from a seated person. The second pressure-receiving member 35 has a net-like plate shape by having a plurality of through holes 35A arranged in the front-rear and left-right directions. The second pressure-receiving member 35 extends longitudinally, is connected to the rear cross member 32 and the front cross member 33 , and spans the rear cross member 32 and the front cross member 33 .

As shown in FIG. 9B, the second pressure receiving member 35 includes a body portion 35B, a front reinforcement connection portion 35D, and a rear reinforcement connection portion 35F. The body portion 35</b>B constitutes the upper surface of the second pressure receiving member 35 , is connected to the front cross member 33 on the passenger side, and is connected to the rear cross member 32 on the passenger side. The front reinforcement connecting portion 35D branches from the front portion of the main body portion 35B and extends to the side opposite to the occupant, and is connected to the front cross member 33. As shown in FIG. The rear reinforcement connection portion 35F branches off from the rear portion of the main body portion 35B and extends to the side opposite to the occupant, and is connected to the rear cross member 32 . The front reinforcement connection portion 35D and the rear reinforcement connection portion 35F are examples of reinforcement connection portions.

Returning to FIG. 8, the connection bar 37 has a pivot hole 37A penetrating from side to side at its upper end. A pair of connection bars 37 are connected to each other by two X-shaped metal wires 37X.

A shaft (not shown) passes through the shaft support hole 37A of the connection bar 37 and the shaft support hole 17A of the connection bar 17 of the lower frame 10, thereby allowing the seat back to the rear frame 30 of the seat cushion frame S1. A lower frame 10 of the frame S2 is rotatable.

In the rear frame 30, the side frames 31, the rear cross member 32, the front cross member 33, the second pressure receiving member 35, and the connecting bar 37 are all integrally molded from the same metal material by a three-dimensional metal printer.

A front frame 40 of the seat cushion frame S1 includes a pair of side frames 41 , a rear cross member 42 , a front cross member 43 and a second pressure receiving member 45 .

The pair of side frames 41 are arranged to be left and right apart from each other. Each side frame 41 is provided with a fixing portion 41A projecting inward in the left and right direction. A hole 41B penetrating vertically is formed in the fixed portion 41A. As shown in FIG. 9(a), two fixed portions 41A are arranged on each side frame 41 with a space therebetween in the front-rear direction. The side frame 41 is fixed to the upper rail 52 at each fixing portion 41A by, for example, passing bolts through the holes 41B.

Returning to FIG. 8 , the rear cross member 42 is an example of a cross member extending in the left-right direction, and connects the rear end portions of the pair of side frames 41 . The rear cross member 42 has a main body portion 42A made of an iso-truss annular mesh structure similar to the annular mesh structure portion 11, an inclined portion 42B inclined upward to the right, and a right side portion 42C. The main body portion 42A, the inclined portion 42B, and the right side portion 42C have a ring-shaped axis that is linear. The body portion 42A and the inclined portion 42B are connected by a connection pipe 42X, which is an example of a non-mesh connection portion. The inclined portion 42B and the right side portion 42C are connected by a connection pipe 42Y as an example of a non-mesh connection portion. Thus, in the rear cross member 42, the annular mesh structure and the non-net-like connection pipes 42X and 42Y are alternately arranged along the longitudinal direction. Each annular network structure portion of the rear cross member 42 and the connection pipes 42X and 42Y are formed integrally.

The front cross member 43 is an example of a cross member extending in the left-right direction, and connects front end portions of the pair of side frames 41 . The front cross member 43 has a main body portion 43A made of an isotrus annular mesh structure similar to the annular mesh structure portion 11, an inclined portion 43B inclined upward to the right, and a right side portion 43C. The main body portion 43A, the inclined portion 43B, and the right side portion 43C have a ring-shaped axis that is linear. The body portion 43A and the inclined portion 43B are connected by a connection pipe 43X as an example of a non-mesh connection portion. The inclined portion 43B and the right side portion 43C are connected by a connection pipe 43Y as an example of a non-mesh connection portion. Thus, in the front cross member 43, the annular mesh structure and the non-net-like connection pipes 43X and 43Y are alternately arranged along the longitudinal direction. Each annular network structure portion of the front cross member 43 and the connecting pipes 43X and 43Y are formed integrally.

The second pressure receiving member 45 is a member that receives the load from the seated person. The second pressure receiving member 45 has a net-like plate shape by having a plurality of triangular or quadrangular through holes 45A. The second pressure receiving member 45 extends laterally and is connected to the rear cross member 42 and the front cross member 43 , respectively, and bridges the rear cross member 42 and the front cross member 43 .

In the front frame 40, the side frames 41, the rear cross member 42, the front cross member 43, and the second pressure receiving member 45 are all integrally formed of the same metal material by a metal three-dimensional printer.

According to the seat frame S configured as described above, the following effects can be obtained.
By partially having ring-shaped annular network structures (annular network structures 11, 12, 21, rear cross members 32, 42, and front cross members 33, 43), light weight and high rigidity can be achieved. can be done. In particular, by adopting the isotruss structure for the annular network structure, the seat frame S can be made lightweight and highly rigid.

The annular network structure portions 11 and 12 can be easily designed by forming the annular network structure portions 11 and 12 in a pipe shape with a linear axis, that is, a linear pipe shape. By connecting the plurality of annular network structure portions 11 and 12 with the curved pipes 13 that are not mesh-shaped, the linear portions constituting the mesh can be easily connected to the curved pipes 13, so that the annular network structure portion 11 , 12 can be easily connected.

By forming the curved pipe 13 as the connection portion, the annular network structure portions 11 and 12 can be formed in a straight pipe shape, and the bent pipe 13 portion can create a curved shape. Design and manufacturing can be facilitated.

Furthermore, by connecting the connecting member 62 to the bent pipe 13 and the connecting end portion 14 while avoiding the annular network structure portions 11 and 12, the connecting member 62 can be easily connected to the basic structural portion of the seatback frame S2. .

Further, by forming the annular network structure portions 11 and 12 integrally with the bent pipe 13, the basic structural portion having the annular network structure portions 11 and 12 and the bent pipe 13 can be an integrated high-rigidity member. be able to. Similarly, each part of the rear cross member 32 (central part 32A, right side part 32B, left side part 32C) and the connection bar 37 are integrally molded, and each part of the front cross member 33 (main body part 33A, right side part 33B, connection block 33X) is integrally molded. ) can be integrally molded, the rear frame 30 can be made into an integral high-rigidity member. As for the front frame 40, similarly, by integrally molding the annular network structure and the connecting portion, it is possible to form an integrated high-rigidity member.

Further, since the bending pipe 13 and the connection pipes 42X, 42Y, 43X, and 43Y are hollow pipe shapes, the annular network structure portions can be easily connected to each other while making the connecting portions lightweight and highly rigid.

In addition, since the second pressure receiving members 35 and 45 have a net-like plate shape, the seat cushion frame S can be reinforced with a lightweight structure and made highly rigid.

Further, the second pressure receiving member 35 is connected to the occupant side of the rear cross member 32 , extends in a branched manner toward the side of the rear cross member 32 opposite to the occupant, and is connected to the rear cross member 32 for rear reinforcing connection. By having the portion 35F, the connection between the second pressure receiving member 35 and the rear cross member 32 can be strengthened.
Similarly, a second pressure receiving member 35 is connected to the occupant side of the front cross member 33 and extends in a branched manner toward the side of the front cross member 33 opposite to the occupant. By having the connection portion 35D, the connection between the second pressure receiving member 35 and the front cross member 33 can be strengthened.
That is, the second pressure-receiving member 35 has a two-layer structure in which a part is divided into upper and lower parts, thereby having high rigidity.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment and can be carried out with appropriate modifications.

For example, in the above embodiment, the lower frame 10 and upper frame 20 of the seat back frame S2, and the rear frame 30 and front frame 40 of the seat cushion frame S1 are integrally molded from the same material. It may be constructed from different materials. For example, even in the case of integral molding by a metal three-dimensional printer, the annular network structure portion and the connection portion may be made of different materials. This makes it possible to select the appropriate material for each part. For example, by using an aluminum alloy for the annular network structure and a steel material for the connecting portion, it is possible to further reduce the weight while ensuring the rigidity.

Further, the seat frame S may be heat-treated after at least the annular network structure portion is molded. By heat-treating the annular network structure portion, for example, the structure can be refined to make the annular network structure portion more rigid.

In the above embodiment, the first pressure receiving member having the ring portion was provided on the seat back frame, but it may be provided on the seat cushion frame. Moreover, although the mesh plate-shaped second pressure receiving member is provided on the seat cushion frame, it may be provided on the seat back frame.

Further, in the above-described embodiment, the connecting members 62 and 72 are connected by being integrally formed with the basic structural portion of the seatback frame S, but they may be connected by assembly. 10 to 13 are diagrams for explaining modifications of this connection method. This connection method itself can also be applied to a seat frame that does not have an annular mesh structure, so the figure shows a seat frame that does not have an annular mesh structure.

As shown in FIG. 10, in the first modification of the fixing structure of the pressure receiving member, in order to connect the connecting member 72 to the seat back frame SB, a hinged assembly member 260 can be used at the tip of the connecting member 72. can. The pipe frame 200 of the seatback frame SB has left and right side frames 220 and an upper cross member 210 that connects the upper ends of the side frames 220, and has a U shape. The pipe frame 200 does not have a mesh shape, but is formed by bending a single pipe into a U shape. A connection end member 250 is connected to the lower end of the side frame 220 . The connection end member 250 has a circular projection 251 corresponding to the inner diameter of the pipe frame 200, as shown by cutting one end of the side frame 220. It is attached to the pipe frame 200 by being press-fitted into the pipe frame 200 .

As shown in FIG. 11( a ), the assembly member 260 has a fixed portion 261 and a movable portion 262 .
The fixing portion 261 includes a body portion 261A having a semicircular groove 261G corresponding to the outer shape of the pipe frame 200 (upper cross member 210), and a hinge receiving portion 261B provided on one side of the groove 261G of the body portion 261A. , and a lock portion 261D provided on the other side of the groove 261G. The hinge receiving portion 261B has a hole 261C. The locking portion 261D has a semi-cylindrical shaft portion 261E and a semi-elliptical engaging portion 261F provided at the tip of the shaft portion 261E and having a larger diameter than the shaft portion 261E.

The movable portion 262 includes a body portion 262A having a semicircular groove 262G corresponding to the outer shape of the pipe frame 200 (upper cross member 210), a hinge portion 262B provided on one side of the groove 262G of the body portion 262A, and a locking portion 262D provided on the other side of the groove 262G. The hinge portion 262B has a cylindrical shaft portion 262C corresponding to the hole 261C. The locking portion 262D has a semi-cylindrical shaft portion 262E and a semi-elliptical engaging portion 262F provided at the tip of the shaft portion 262E and having a larger diameter than the shaft portion 262E.

When assembling the assembly member 260 to the pipe frame 200 (upper cross member 210), first, as shown in FIG. Then, as shown in FIG. 11(b), the shaft portion 262C is inserted into the hole 261C. Further, as shown in FIG. 11(c), the movable portion 262 is rotated to align the groove 262G with the pipe frame 200. Then, as shown in FIG.

Then, as shown in FIG. 11(d), the shaft portion 261E and the shaft portion 262E are combined to form a cylindrical shape, and the engaging portion 261F and the engaging portion 262F are combined to form an elliptical shape. The elliptical engagement portions 261F and 262F are passed through an elliptical through hole 263A formed in the lock plate 263 as shown in FIG. 11(e). By rotating the lock plate 263 by 90 degrees, as shown in FIG. , the movable portion 262 also does not move from the fixed portion 261 . The assembly member 260 can be assembled to the pipe frame 200 in this way.

As shown in FIG. 12(a), in the second modification of the fixing structure of the pressure receiving member, a C-shaped assembly member 360 is attached to the tip of the connecting member 72 in order to connect the connecting member 72 to the seatback frame SB. can be used.

As shown in FIG. 12( b ), the assembly member 360 has a constant C-shaped cross section and has a slit 365 . Each tip of the assembly member 360 on the side of the slit 365 has a tapered surface 361 that widens toward the outside. The assembly member 360 is made of a flexible material so that the slit 365 can elastically expand to approximately the diameter of the pipe frame 200 .
Therefore, by pressing the tapered surface 361 against the pipe frame 200 , the assembly member 360 is elastically spread, so that the assembly member 360 can be aligned with the outer circumference of the pipe frame 200 .

The assembly member of the second modification may have a double structure by connecting two C-shaped main body portions 362B with a connection portion 363C, like an assembly member 360B shown in FIG. 12(c). can. In this way, the assembly member 360B can be more securely assembled to the pipe frame 200. As shown in FIG.

As shown in FIG. 13(a), in the third modification of the fixing structure of the pressure receiving member, in order to connect the connecting member 72 to the seatback frame SB, a caulking type assembly member 460 is attached to the tip of the connecting member 72. can be used.

As shown in FIG. 13(b), the assembly member 460 includes a body portion 461 having a semicircular groove 461G and two deformation walls 462 extending from the body portion 461 before assembly. there is The two deformation walls 462 are parallel to each other. A projection 462A and a groove 462B are formed at the tip of the deformation wall 462 . The protrusion 462A of one deformation wall 462 is located at a position corresponding to the groove 462B of the other deformation wall 462 in the axial direction of the groove 461G.

When assembling such an assembly member 460 to the pipe frame 200, first, the outer circumference of the pipe frame 200 is aligned with the semicircular groove 461G. Then, a caulking jig 465 having a semicircular groove 465G is prepared, and the groove 465G is pressed against the two deformation walls 462 from the distal end side of the deformation walls 462 . Then, as shown in FIG. 13(c), the deformable wall 462 is deformed into a semi-cylindrical shape and is fixed by hugging the pipe frame 200. As shown in FIG. At this time, the protrusion 462A at the tip of the deformable wall 462 and the groove 462B engage with each other, and the assembly member 460 is firmly fixed to the pipe frame 200. As shown in FIG.

The present invention is not limited to the modified examples described above, and can be implemented in any suitable form as long as it does not violate the gist of the present invention.
For example, in the above-described embodiments, the case where the seat frame and the seat are applied to the vehicle seat of the rear seat has been described, but the seat frame and the seat of the present invention may be applied to the front seat of the vehicle, or to the vehicle other than the vehicle. It may be applied to sheets for Also, the seat may be a seat other than a vehicle, such as a seat installed in a general home or a welfare facility.

Also, each element described in each embodiment and each modification described in this specification can be implemented in combination as appropriate.

2 Pad 3 Skin Member 10 Lower Frame 11, 12 Annular Network Structure 13 Bent Pipe 20 Upper Frame 21 Annular Network Structure 30 Rear Frame 31 Side Frame 32 Rear Cross Member 33 Front Cross Member 35 Second Pressure Receiving Member 35D Front Reinforcement Connecting Portion 35F rear reinforcement connecting portion 40 front frame 41 side frame 42 rear cross member 43 front cross member 45 second pressure receiving member 60 first pressure receiving member 61 ring portion 62 connecting member 70 first pressure receiving member 71 ring portion 72 connecting member 80 slider 90 fixed Rail S Seat frame S1 Seat cushion frame S2 Seat back frame ST Seat

Claims (16)

seat cushion frame,
a seat back frame;
a second pressure receiving member provided in the seat cushion frame or the seat back frame and receiving a load from a seated person,
At least a part of the seat cushion frame and the seat back frame has an annular network structure having a network ring shape,
The second pressure receiving member has a net-like plate shape,
The seat cushion frame or the seat back frame has a cross member extending in the left-right direction,
The second pressure-receiving member has a main body connected to the cross member, and a reinforcing connection part extending branching from the main body toward the side opposite to the occupant and connected to the cross member. and seat frame. 2. The seat frame according to claim 1, wherein the annular network structure portion has an isotrus structure. A plurality of the annular network structure portions are provided, each of which has a linear axis of the annular shape,
3. The seat frame according to claim 1, further comprising a non-mesh connecting portion that connects the plurality of annular network structure portions. 4. The seat frame according to claim 3, wherein the connection portion connects the plurality of annular network structure portions in different directions. 3 or 4, wherein another member or other portion separate from the annular network structure and the connecting portion is connected to the connecting portion and is not connected to the annular network structure. 4. The seat frame according to 4. 6. The seat frame according to any one of claims 3 to 5, wherein the annular network structure portion and the connection portion are integrally formed. 7. The seat frame according to claim 6, wherein the annular network structure portion and the connection portion are made of different materials. The seat frame according to any one of claims 3 to 7, wherein the connecting portion has a hollow pipe shape. The seat frame according to any one of claims 3 to 8, wherein the annular network structure portions and the connection portions are alternately arranged. further comprising a first pressure receiving member provided on the seat cushion frame or the seat back frame and receiving a load from a seated person;
The first pressure receiving member is
a ring portion;
10. The seat frame according to any one of claims 3 to 9, further comprising a plurality of connecting members extending from the ring portion and connected to the seat back frame or the seat cushion frame. 11. The seat frame according to claim 10, wherein the connecting member is connected to the connecting portion. 12. The seat frame according to any one of claims 1 to 11, wherein at least the annular network structure portion is heat-treated after molding. 13 , further comprising: a first member; and a second member that is non-separably engaged with the first member and movable relative to the first member. A seat frame according to any one of claims 1 to 3. A method for manufacturing a seat frame according to any one of claims 1 to 13 , comprising:
A method of manufacturing a seat frame, characterized in that at least the annular mesh structure is formed by a metal three-dimensional printer. 14. The method of manufacturing a seat frame according to claim 13 , wherein said first member and said second member are formed simultaneously by a three-dimensional metal printer. A seat frame according to any one of claims 1 to 13 ;
a pad covering the seat frame;
and a skin member covering the pad.

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