JP5442389B2 - Cushion side frame and seat frame - Google Patents

Description

  The present invention relates to a cushion side frame forming a part of a skeleton of a seat portion of a vehicle seat and a seat frame including the cushion side frame.

  2. Description of the Related Art Conventionally, in a seat cushion frame that forms a skeleton of a seat portion for a vehicle such as a four-wheeled vehicle, strength and rigidity are improved by devising the shape and the like. For example, a technique for increasing the overall thickness of the seat cushion frame is known.

  There is also known a technique in which a reinforcing member is joined by welding or the like to a cushion side frame that forms a part of a seat cushion frame and supports the side of a seat (see, for example, Patent Document 1).

JP 2005-67332 A

  Among the above-mentioned conventional technologies, when the strength and rigidity are improved by increasing the thickness of the cushion side frame as a whole, the thickness of the cushion side frame is determined based on a location where a large stress is generated when a vehicle collision test is performed. It is common to make it larger. However, in this case, for example, a portion where only a relatively small stress is generated, such as the vicinity of the front portion of the seat, is uniformly thickened with other portions, so that the strength and rigidity are improved more than necessary, and the cushion There was a problem that the mass of the side frame would increase excessively.

  Further, in the technique described in Patent Document 1 described above, when the reinforcing member is welded to the main body of the cushion side frame, a space for welding is also required in addition to the welding allowance. As a result, there is a problem that the cushion side frame becomes large.

  The present invention has been made in view of the above, and a cushion side frame capable of appropriately improving strength and rigidity while suppressing an increase in mass and an increase in size, and a seat frame including the cushion side frame The purpose is to provide.

  In order to solve the above-described problems and achieve the object, a cushion side frame according to the present invention forms a part of a skeleton of a seat portion of a vehicle seat, and a side on which the backrest portion of the seat is provided is a rear side. A cushion side frame that extends along the front-rear direction of the seat and is connected to a reclining device that adjusts an inclination angle of a seat back frame whose rear end portion forms a skeleton of the backrest portion, and a connection portion with the reclining device And a thin-walled portion joined to the front end of the thick-walled portion and having a smaller thickness than the thick-walled portion.

  The cushion side frame according to the present invention is characterized in that, in the above invention, the thick portion and the thin portion are welded while abutting each other's end faces.

  In the above invention, the cushion side frame according to the present invention is formed using the tailored blank material in which the thick part and the thin part are welded by abutting the end faces of two flat plates having different thicknesses. It is characterized by that.

  Further, in the cushion side frame according to the present invention, in the above invention, the thick portion forms a part of a height adjustment mechanism for adjusting the height of the cushion side frame, and suppresses the vertical movement of the cushion side frame. An insertion hole for inserting the drive shaft of the brake member is formed.

  Further, in the cushion side frame according to the present invention, in the above invention, the thick portion has a recess recessed from the outside to the inside of the seat, and the insertion hole is provided on a bottom surface of the recess. It is characterized by that.

  A seat frame according to the present invention is a seat frame that forms a skeleton of a vehicle seat, and includes the cushion side frame described in the above invention.

  According to the present invention, a thick portion including a connecting portion with a reclining device, and a thin portion that is joined to the front end portion of the thick portion and is smaller in thickness than the thick portion, The part and the thin part are formed using a tailored blank material that is welded by abutting flat plates of different thicknesses, so using one material increases the thickness behind the seat where large stress is likely to occur. On the other hand, it is possible to reduce the thickness in front of the seat where only a relatively small stress is generated. Therefore, strength and rigidity can be appropriately improved while suppressing an increase in mass and an increase in size.

FIG. 1 is a perspective view showing an overall configuration of a seat frame according to an embodiment of the present invention. FIG. 2 is a perspective view showing the configuration of the seat cushion frame according to the embodiment of the present invention. FIG. 3 is a side view showing the configuration of the seat cushion frame according to the embodiment of the present invention. 4 is a cross-sectional view taken along line BB in FIG. 5 is a cross-sectional view taken along the line CC of FIG. 6 is a cross-sectional view taken along the line DD of FIG. FIG. 7 is a diagram for explaining the effect of the seat cushion frame according to the embodiment of the present invention. FIG. 8 is another diagram for explaining the effect of the seat cushion frame according to the embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing an overall configuration of a seat frame according to an embodiment of the present invention. A seat frame 1 shown in the figure is provided inside a seat of a vehicle such as a four-wheeled vehicle and forms a skeleton of the seat. The seat frame 1 connects the seat cushion frame 2 that forms the skeleton of the seat portion of the seat, the seat back frame 3 that forms the skeleton of the backrest portion, and the seat cushion frame 2 and the seat back frame 3. A reclining device 4 that adjusts the angle, and a headrest frame 5 that is attached to the seat back frame 3 and forms a skeleton of the headrest located above the backrest.

  FIG. 2 is a perspective view showing the configuration of the seat cushion frame 2, and is a perspective view of the seat cushion frame 2 as viewed from the upper right side of FIG. 1. FIG. 3 is a side view of the seat cushion frame 2 as viewed from the direction of arrow A in FIG. 4 is a cross-sectional view taken along the line BB in FIG. 3, and is an upper left side of the BB line. 5 is a cross-sectional view taken along the line CC of FIG. 6 is a cross-sectional view taken along the line DD of FIG. Hereinafter, the configuration of the seat cushion frame 2 will be described with reference to FIGS. In the following, when the position in the seat cushion frame 2 is indicated, the side on which the seat back frame 3 is provided is referred to as the rear, and the front / rear and left / right directions of the seat cushion frame 2 are determined based on this.

  The seat cushion frame 2 supports the left and right side lower portions of the seat portion of the seat, and connects the cushion side frames 21R and 21L that are mirror-symmetrical to each other and the front ends of the cushion side frames 21R and 21L. Cushion front frame 22.

  The cushion side frame 21R is formed by pressing a tailored blank material formed by abutting the end portions of two plate materials having different thicknesses and wire welding, and extends along the front-rear direction of the seat. . The cushion side frame 21R includes a thick portion 23R including a connecting portion with the reclining device 4, and a thin portion 24R having a thickness smaller than that of the thick portion 23R. Prepare. The thickness of the thick part 23R is about 1.2 to 3.0 times the thickness of the thin part 24R. Similarly to the cushion side frame 21R, the cushion side frame 21L is formed by pressing a tailored blank material, and has a thick portion 23L and a thin portion 24L.

  A connecting hole 25R for screwing a screw for connecting the reclining device 4 and a pipe hole 26R for attaching a rear pipe 6 to be described later are formed at the rear end of the thick portion 23R. Further, a concave portion 231R that is recessed from the outer side (right side surface side) to the inner side (left side surface side) of the thick portion 23R is provided, and a side surface corresponding to the bottom surface of the concave portion 231R. An insertion hole 27R is formed through which a drive shaft 10a of the brake member 10 described later is inserted. A connecting hole 25L and a pipe hole 26L are also formed at the rear end portion of the thick portion 23L, and an insertion hole 27L is formed at the bottom surface of the recess 231L provided at the substantially central portion. The reclining device 4 may be connected to the cushion side frame 21R by welding.

  Pipe holes 28 </ b> R and 28 </ b> L for attaching the front pipe 12 to be described later are formed in the middle portions of the thin portions 24 </ b> R and 24 </ b> L, respectively.

  In the cushion side frame 21R, the ratio of the length in the longitudinal direction of the thick portion 23R to the length in the longitudinal direction of the thin portion 24R is determined by the strength and rigidity required for the cushion side frame 21R.

  Below the cushion side frames 21R and 21L, slide mechanisms for sliding the seat frame 1 back and forth are provided (not shown).

  The seat back frame 3 supports the left and right side portions of the backrest portion of the seat, and connects the back side frames 31R and 31L that are mirror-image symmetrical with each other and the lower ends of the back side frames 31R and 31L. Lower frame 32, upper portion 33 having an end portion joined to the upper ends of backside frames 31R and 31L and having a substantially U shape, and a holding portion that is attached to upper portion 33 and holds the lower end portion of headrest frame 5 34.

  At both ends of the reclining device 4, brackets 41R and 41L are provided for coupling and fixing to the cushion side frames 21R and 21L, respectively. The bracket 41R is connected to the rear end of the thick portion 23R, while the bracket 41L is connected to the rear end of the thick portion 23L.

  The seat frame 1 having the above configuration is realized using, for example, a high-tensile steel material. In addition, it is also possible to implement | achieve the seat frame 1 using metal steel plates other than high-tensile steel materials.

  Here, a height adjustment mechanism for adjusting the height of the seat frame 1 will be described. The height adjusting mechanism includes a rear pipe 6 that connects the rear ends of the thick portions 23R and 23L, and a sector that is attached to the right end of the rear pipe 6 and connected to the slide mechanism, and has a tooth portion on a substantially fan-shaped arc portion. The geared link member 8 formed with the gear 7, the pinion gear 9 meshing with the sector gear 7, and the thick portion 23R are attached by rivets, burring caulking, screwing or welding, and control the rotation of the pinion gear 9. The brake member 10, the link member 11 attached to the left end portion of the rear pipe 6 and connected to the slide mechanism, the front pipe 12 connecting the central portions of the thin portions 24R and 24L, and the left and right end portions of the front pipe 12 are provided. And two link members 13 connected to the slide mechanism.

  The geared link member 8 is provided at the right end portion of the rear pipe 6 and in the vicinity of the left side surface of the thick portion 23R, and at the lower end thereof, the geared link member 8 can be rotated with respect to the slide mechanism. An insertion hole 81 for inserting a support pin to be connected and supported is provided.

  The pinion gear 9 is pivotally supported on the drive shaft 10a of the brake member 10 attached to the thick portion 23R. The brake member 10 is a member that restricts the rotation of the pinion gear 9. When an external force is directly applied to the pinion gear 9, the brake member 10 suppresses the rotation of the pinion gear 9, while an external force is input from the operation input unit. Has a function of rotating the pinion gear 9 by transmitting a driving force corresponding to the external force through the driving shaft 10a. In FIG. 2, the description of the tooth portions of the sector gear 7 and the pinion gear 9 is omitted.

  The link member 11 is provided at the left end portion of the rear pipe 6 and in the vicinity of the right side surface of the thick portion 23L, and the lower end portion thereof supports the link member 11 so as to be rotatable with respect to the slide mechanism. An insertion hole 111 for inserting a pin is provided.

  Of the two link members 13, one is the right end of the front pipe 12 and is provided near the left side of the thin portion 24R, and the other is the left end of the front pipe 12 and is provided near the right side of the thin portion 24L. At the lower end of the link member 13, an insertion hole 131 is provided for inserting a support pin that rotatably connects and supports the link member 13 with respect to the slide mechanism.

  In the height adjustment mechanism having the above configuration, when an external force is applied to the operation input portion of the brake member 10, the link member with gear 8 rotates about the insertion hole 81 through the pinion gear 9 and the sector gear 7. To do. As the geared link member 8 rotates, the link member 11 also rotates about the insertion hole 111 as a rotation center. Thereby, the rear pipe 6 moves diagonally upward or diagonally downward. Since the front pipe 12 also moves following the movement of the rear pipe 6, each link member 13 rotates around the insertion hole 131. Thus, the height position of the seat frame 1 from the floor surface moves up and down according to the input of the brake member 10.

  7 and 8 are diagrams for explaining the effect exerted by the cushion side frame 21R. 7 and 8, as a comparative example, a cushion side frame 14R that is reinforced by attaching a reinforcing member after pressing a single plate is shown. The cushion side frame 14R has substantially the same shape as the cushion side frame 21R, and is formed to have substantially the same strength and rigidity.

  The cushion side frame 14R includes a main body frame 15R having a uniform thickness, and a reinforcing member 16R that is joined to the left side surface (corresponding to the inner side surface of the seat) of the main body frame 15R by welding and reinforces the main body frame 15R. . The cushion side frame 14R has a connection hole 17R and an insertion hole 18R corresponding to the connection hole 25R and the insertion hole 27R of the cushion side frame 21R, respectively. The cushion side frame 14R is provided with a recess 141R corresponding to the recess 231R of the cushion side frame 21R. The plate thickness of the cushion side frame 14R is slightly smaller than the plate thickness of the thick portion 23R of the cushion side frame 21R.

  As is clear from FIGS. 7 and 8, the cushion side frame 14R is larger than the cushion side frame 21R. This is due to the following two reasons. As a first reason, in the case of the cushion side frame 14R, a welding allowance for welding the reinforcing member 16R to the main body frame 15R and a space for bringing a welding torch or the like close at the time of welding can be mentioned. Further, as a second reason, the connecting hole 17R, the insertion hole 18R, and the recess 141R are formed at a location corresponding to the thick portion 23R of the cushion side frame 21R, and therefore it is necessary to provide the reinforcing member 16R. It can be mentioned that the frame 15R and the reinforcing member 16R have to have a shape with sufficient margin.

  As described above, when the strength, rigidity and shape are compared, the cushion side frame 21R formed using the tailored blank material is lighter in weight than the cushion side frame 14R formed using the reinforcing member 16R. It can be seen that this is advantageous in realizing a reduction in size and space and size.

  According to the embodiment of the present invention described above, in the cushion side frames 21R and 21L, the rear portions where the generated moment with respect to the input from the seat back frame 3 is large are the thick portions 23R and 23L, respectively. Since the front portions where the generated moment with respect to the input from the frame 3 is small are the thin portions 24R and 24L, respectively, an excessive increase in mass can be suppressed without improving the strength and rigidity more than necessary.

  Moreover, according to this Embodiment, since a reinforcement member is not used, it is not necessary to ensure the space for a reinforcement member. Therefore, it is possible to suppress an increase in size due to reinforcement.

  In addition, the cushion side frame which concerns on this invention is not necessarily restricted to what was formed using the tailored blank material. For example, as the cushion side frame according to the present invention, a thick-walled portion and a thin-walled portion that are welded with the end portions of the thin-walled portion being overlapped in the plate thickness direction may be applied. You may apply what was applied and welded.

DESCRIPTION OF SYMBOLS 1 Seat frame 2 Seat cushion frame 3 Seat back frame 4 Reclining device 5 Headrest frame 6 Rear pipe 7 Sector gear 8 Geared link member 9 Pinion gear 10 Brake member 10a Drive shaft 11, 13 Link member 12 Front pipe 14R, 21L, 21R Cushion side Frame 15R Body frame 16R Reinforcement member 17R, 25R, 25L Connection hole 18R, 27L, 27R Insertion hole 22 Cushion front frame 23L, 23R Thick part 24L, 24R Thin part 26L, 26R, 28L, 28R Pipe hole 31R, 31L Backside Frame 32 Lower frame 33 Upper part 34 Holding part 41L, 41R Bracket 81, 111, 131 Insertion hole 141R, 231L, 231R Concave

Claims (4)

A seat back that forms a part of a skeleton of a seat portion of a seat for a vehicle, extends along the front-rear direction of the seat with a side where the back portion of the seat is provided as a rear, and a rear end portion forms a skeleton of the back portion A cushion side frame connected to a reclining device for adjusting the inclination angle of the frame,
A thick portion including a connecting portion with the reclining device;
It is joined to the front end of the thick part, and the thin part is thinner than the thick part,
Equipped with a,
The thick part is
Part of the height adjustment mechanism that adjusts the height of the cushion side frame,
Having a recess recessed from the outside to the inside of the sheet,
On the bottom surface of the recess, an insertion hole is formed through which the drive shaft of the brake member that suppresses the vertical movement of the cushion side frame is inserted.
The diameter of the opening of the recess is larger than the diameter of the brake member in the direction orthogonal to the drive shaft,
The cushion side frame , wherein the concave portion can accommodate at least a part of the brake member .   The cushion side frame according to claim 1, wherein the thick portion and the thin portion are welded while abutting each other's end faces.   3. The cushion side frame according to claim 2, wherein the thick part and the thin part are formed using a tailored blank material in which end surfaces of two flat plates having different thicknesses are abutted and welded to each other. . A seat frame that forms the skeleton of a vehicle seat,
A seat frame comprising the cushion side frame according to any one of claims 1 to 3 .

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