JP7352836B2 - seat frame - Google Patents

Description

The present invention relates to a seat frame. Specifically, the present invention relates to a seat frame having legs that support a vehicle seat against a floor and reinforcing panels welded to the legs.

Conventionally, as a seat frame for a vehicle, a configuration in which a reinforcing panel is spanned between a pair of left and right legs that support a seat cushion against a floor is known (Patent Document 1). The pair of left and right legs each have a U-shaped cross section with an upward opening, and a lid member on which a reinforcing panel is placed and welded is welded to the upper surface thereof.

JP 2019-218005 Publication

Since it is necessary to weld the lid member to the upper surface of the leg, the overall weight and manufacturing cost are increased. Furthermore, it is necessary to bend the reinforcing panel to a position where it can be placed on the upper surface of the leg, resulting in an increase in the size of the panel and a decrease in structural strength. Therefore, the present invention provides a seat frame in which a reinforcing panel can be rationally joined from the side to a leg having a U-shaped opening cross section.

In order to solve the above problems, the seat frame of the present invention takes the following measures.

That is, the present invention is a seat frame that has legs that support a vehicle seat against a floor, and reinforcing panels that are welded to the legs. The leg has a U-shaped cross section that opens upward and extends in the front and back direction of the seat, and a through hole that is formed through the side of the U-shaped cross section and allows the panel to pass through in the seat width direction. and a welding portion for welding the panel to the U-shaped cross-section with the panel passed through the through-hole in contact with the bottom of the U-shaped cross-section.

According to the above configuration, by passing the reinforcing panel through the through hole formed in the side of the U-shaped cross-section, the U-shaped cross-section of the leg can be inserted into the U-shaped cross-section of the leg in a short length without bending to a position where it can be placed on the upper surface of the leg. Can be welded to. Specifically, the panel can be welded to the bottom of the U-shaped section with a short length and a small amount of bending, and can be joined to the legs with high structural strength.

Moreover, the present invention may be further configured as follows. A side portion of the U-shaped cross section has a flesh portion above the through hole that does not open the through hole upwardly.

According to the above configuration, the through hole can be formed without significantly reducing the structural strength of the side portion of the U-shaped cross section.

Moreover, the present invention may be further configured as follows. A through hole is formed at the lower end of the side portion that opens the bottom side of the U-shaped cross section.

According to the above configuration, the reinforcing panel can be brought into contact with the bottom of the U-shaped cross section with a shorter length and a smaller amount of bending from the through hole.

Moreover, the present invention may be further configured as follows. A weld is formed at the bottom of the U-section.

According to the above configuration, the reinforcing panel can be more rationally abutted and welded to the bottom of the U-shaped cross section.

Moreover, the present invention may be further configured as follows. The through hole is formed in two parts in the front and back direction of the seat. The panel has two through holes which are respectively passed through the two through holes and welded to the U-shaped section.

According to the above configuration, the reinforcing panel can be passed through a wide range in the front-rear direction of the seat without increasing the size of the through-hole. Therefore, a substantially wide through hole can be formed without significantly reducing the structural strength of the side portion of the U-shaped cross section.

Moreover, the present invention may be further configured as follows. The upper edge of the side of the U-shaped section is arranged higher than the fixed part welded to the floor of the panel.

According to the above configuration, the reinforcing panel can be more effectively welded to the bottom of the U-shaped cross section with a short length and a small amount of bending.

FIG. 2 is a perspective view showing the configuration of a seat frame according to the first embodiment. FIG. 3 is a perspective view showing a state in which the seat frame is switched to a retracted state. FIG. 3 is an enlarged perspective view of the front region of the seat frame. 4 is a sectional view taken along the line IV-IV in FIG. 3. FIG. 4 is a sectional view taken along the line VV in FIG. 3. FIG. FIG. 5 is a sectional view corresponding to FIG. 4 illustrating the configuration of a seat frame according to another embodiment. FIG. 5 is a sectional view corresponding to FIG. 4 illustrating the configuration of a seat frame according to another embodiment.

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

(First embodiment)
<About the schematic configuration of the seat frame 10>
First, the configuration of a seat frame 10 according to a first embodiment of the present invention will be explained using FIGS. 1 to 5. In the following description, when directions such as front, back, top, bottom, left, and right are indicated, the respective directions shown in each figure are referred to. In addition, when referring to "the sheet width direction", it refers to the left-right direction of the sheet 1, which will be described later.

As shown in FIG. 1, a seat frame 10 according to the present embodiment is configured as a frame of a seat (vehicle seat) 1 forming a rear seat of an automobile. The seat 1 is configured to include a seat back 2 serving as a backrest for a seated person, a seat cushion 3 serving as a seating area, and a headrest (not shown) serving as a headrest.

The seat frame 10 includes a back frame 11 that forms the skeleton of the seat back 2, a cushion frame 12 that forms the skeleton of the seat cushion 3, and a pair of left and right legs 13 that respectively support the back frame 11 and the cushion frame 12 with respect to the floor F. , and a reinforcing panel 14 spanning between the front portions of each leg 13. The back frame 11 has a frame-like configuration when viewed from the front.

The lower end portions of the left and right sides of the back frame 11 are connected to the legs 13 on each side via recliners 11A, respectively. Thereby, during normal use, the back frame 11 is maintained at a fixed standing angle with respect to the floor F. However, by operating a lever (not shown) provided on the seat 1, the back frame 11 is unlocked by the recliners 11A on each side, and the standing angle with respect to the floor F cannot be adjusted in the seat front-rear direction. Switch to a state where it is possible.

Furthermore, when the lever (not shown) is released, the back frame 11 is returned to the state where the upright angle with respect to the floor F is fixed at the adjusted angular position. Specifically, in the region on the rear side from the angle at which the back frame 11 stands straight with respect to the floor F, the standing angle is returned to a fixed state by returning the lever operation. However, since the back frame 11 is tilted forward to the angle with respect to the floor F, even if the lever operation is returned, the back frame 11 is tilted forward to the position where it falls onto the floor F. (See Figure 2).

As shown in FIG. 1, the cushion frame 12 has a frame-like configuration in a plan view. The front frame portion of the cushion frame 12 is connected to a panel 14 on the floor F via a pair of left and right control links 12A. In addition, the cushion frame 12 has its rear end portions on both left and right sides slidable into elongated holes 13A extending in the seat front-rear direction formed in the legs 13 on each side via slide pins (not shown). are connected like this.

During normal use, the cushion frame 12 is seated in an L-shape in side view with the back frame 11 with each slide pin (not shown) locked in the front end of the long hole 13A of each leg 13. It is maintained in a plane shape. However, when the above-mentioned lever (not shown) is operated and the back frame 11 is tilted forward, the cushion frame 12 is unlocked from sliding with respect to the long hole 13A of each leg 13, and the cushion frame 12 is moved to the rear of each control link 12A. As it rotates, it slides rearward and downward along the elongated hole 13A of each leg 13.

Thereby, the cushion frame 12 is stored under the luggage floor of a vehicle (not shown). Further, the back frame 11 is folded down so that the backs of the seat backs 2 are flush with the front part of the luggage floor (not shown).

As shown in FIGS. 3 and 4, each leg 13 has a U-shaped cross section 13B in its front region that is upwardly opened and extends in the front-rear direction of the seat. A reinforcing panel 14 extending in the seat width direction is spanned and welded to each of the legs 13 between the U-shaped cross-sectional portions 13B (welded portion W1). Hereinafter, the specific configuration of the U-shaped cross section 13B of each leg 13 and the reinforcing panel 14 will be described in detail.

The U-shaped cross-section portion 13B of each leg 13 includes a flat bottom portion 13B1 that is grounded on the floor F, a vertical plate-like inner portion 13B2 that rises from the inner edge of the bottom portion 13B1 in the seat width direction, and a bottom portion. It has a U-shaped cross-sectional shape including an upright plate-like outer portion 13B3 rising from the outer edge in the sheet width direction of the sheet 13B1. Here, each inner side portion 13B2 corresponds to a “side portion” of the present invention.

As shown in FIG. 3, each inner side portion 13B2 has a through hole 13B4 formed at its lower end portion through which the corresponding end portion (through portion 14A) of each side of the panel 14 passes from the inside in the sheet width direction. ing. As shown in FIG. 4, these through holes 13B4 are formed by cutting out the corners of each inner part 13B2 and each bottom part 13B1. Thereby, each through hole 13B4 has a hole shape that opens on the side (inside in the sheet width direction) of each bottom portion 13B1.

Each of the through holes 13B4 has an elongated hole shape extending in the front-rear direction of the seat, and is formed so as to be divided into two parallel to each other in the front-rear direction of the seat. On the other hand, each corresponding through-hole 14A of the panel 14 that is passed through each through-hole 13B4 is also formed into a plate shape that is bifurcated in the front-rear direction of the seat, corresponding to the shape of each through-hole 13B4. Each through-hole 14A is passed from the inside in the sheet width direction into the corresponding through-hole 13B4 formed in the inner side 13B2 of the U-shaped cross-section 13B of each leg 13, so that each U-shaped cross-section It is set in a state where the surface is in contact with the bottom part 13B1 of 13B.

After the above-mentioned setting, each of the through parts 14A is joined by arc welding at the joining part between the edge part extending outward in the sheet width direction and the bottom part 13B1 of each U-shaped cross section part 13B (welded part W1). Thereby, each through portion 14A is coupled to the bottom portion 13B1 of each U-shaped cross-section portion 13B in a state in which a load received from above can be transmitted straight downward. Specifically, the entire area of each through-hole 14A after entering the corresponding through-hole 13B4 extends straight in the sheet width direction, and is in surface contact with the bottom 13B1 of each U-shaped section 13B. It is welded.

The reinforcing panel 14 is grounded on the floor F at various midpoints in the sheet width direction and fixed by welding (fixing portions 14B). The fixing portion 14B of the panel 14 is located at a position lower than the upper edge of the inner side portion 13B2 of the U-shaped cross-section portion 13B of each leg 13.

As shown in FIGS. 3 and 5, the panel 14 has, at its rear edge, a first bead 14C in the form of a stripe that projects upward and extends over substantially the entire width of the sheet. It is formed. In addition, as shown in FIG. 3, the panel 14 has a second bead in the form of a stripe extending upward in a region in front of the first bead 14C on both side portions in the sheet width direction. 14D is formed in a shape extending from the middle portion in the sheet width direction to the end portions on each side.

Each of the second beads 14D is formed to extend in the seat width direction along an intermediate portion of the panel 14 in the seat front-rear direction. Each second bead 14D is formed to extend to the dividing line (base end) of each bifurcated through-hole 14A formed at each end of the panel 14. By forming the first bead 14C and each second bead 14D, the bending rigidity of the panel 14 is increased.

As a result, even when the panel 14 receives a large downward load input from each control link 12A connected to the upper center thereof during sudden braking of the vehicle, each leg 13 It is designed so that it can be transmitted as a downward load. Therefore, when the above-mentioned large load is input, each leg 13 can be appropriately prevented from being pulled inward in the seat width direction by the panel 14.

"summary"
To summarize the above, the seat frame 10 according to the present embodiment has the following configuration. Note that the reference numerals given in parentheses below are the reference numerals corresponding to the respective configurations shown in the above embodiments.

That is, the seat frame (10) has legs (13) that support the vehicle seat (1) against the floor (F), and reinforcing panels (14) welded to the legs (13). A leg (13) is formed to penetrate through a U-shaped cross section (13B) that has a U-shaped cross section that opens upward and extends in the front-rear direction of the seat, and a side portion (13B2) of the U-shaped cross section (13B). , a through hole (13B4) through which the panel (14) is passed in the sheet width direction, and the panel (14) passed through the through hole (13B4) is brought into contact with the bottom (13B1) of the U-shaped cross section (13B). and a welding part (W1) for welding the panel (14) to the U-shaped cross-sectional part (13B).

According to the above configuration, the reinforcing panel (14) is placed on the upper surface of the leg (13) by passing it through the through hole (13B4) made in the side (13B2) of the U-shaped cross section (13B). It is possible to weld a short length to the U-shaped section (13B) of the leg (13) without bending it into position. Specifically, the panel (14) can be welded to the bottom (13B1) of the U-shaped section (13B) with a short length and a small amount of bending, thereby providing high structural strength to the leg (13). It can be joined in the state in which it is held.

Further, the side portion (13B2) of the U-shaped cross-sectional portion (13B) has a flesh portion above the through hole (13B4) that does not open the through hole (13B4) upwardly. According to the above configuration, the through hole (13B4) can be formed without significantly reducing the structural strength of the side part (13B2) of the U-shaped cross-sectional part (13B).

Further, a through hole (13B4) is formed at the lower end of the side portion (13B2) that opens the side of the bottom portion (13B1) of the U-shaped cross section (13B). According to the above configuration, the reinforcing panel (14) can be brought into contact with the bottom (13B1) of the U-shaped cross section (13B) with a shorter length and a smaller amount of bending from the through hole (13B4).

Further, a welded portion (W1) is formed at the bottom (13B1) of the U-shaped cross section (13B). According to the above configuration, the reinforcing panel (14) can be more rationally abutted and welded to the bottom (13B1) of the U-shaped cross section (13B).

Further, the through hole (13B4) is formed in two parts in the front and back direction of the seat. The panel (14) has two through holes (14A) that are passed through two through holes (13B4) and welded to the U-shaped section (13B). According to the above configuration, the reinforcing panel (14) can be passed through a wide range in the front and rear direction of the seat without increasing the size of the through hole (13B4). Therefore, a substantially wide through hole (13B4) can be formed without greatly reducing the structural strength of the side part (13B2) of the U-shaped cross section (13B).

Moreover, the upper edge of the side part (13B2) of the U-shaped cross-sectional part (13B) is arranged higher than the fixed part (14B) that is welded to the floor (F) of the panel (14). According to the above configuration, the reinforcing panel (14) can be more effectively welded to the bottom (13B1) of the U-shaped section (13B) with a short length and a small amount of bending.

《Other embodiments》
Although the embodiment of the present invention has been described above using one embodiment, the present invention can be implemented in various forms in addition to the above embodiment.

1. The seat frame of the present invention can be widely applied not only to automobile seats but also to seats used in vehicles other than automobiles such as railways, and other vehicles such as aircraft and ships.

2. The reinforcing panel may be passed through the leg from the inside in the seat width direction, or it may be passed through the leg from the outside in the seat width direction. The through holes of the legs through which the panels are passed may be formed not only on the inner side in the seat width direction of the U-shaped cross section but also on the outer side. Further, the through holes may be formed to penetrate through both sides of the U-shaped cross section.

Further, the through hole may be formed not only at the lower end of the side portion of the U-shaped cross section of the leg, but also at the upper end or an intermediate location. Further, the through hole may be formed so that the side part of the U-shaped cross section of the leg has an upwardly opening shape. Further, the insertion structure for passing the panel through the through hole of the leg may be composed of only one, without being divided into two in the front and back direction of the seat. The panel may be configured to span between a pair of left and right legs, or may be configured to be joined only between one leg and the floor.

3. The upper edge of the side of the U-shaped cross section of the leg may be located lower than the portion of the panel fixed to the floor.

4. The panel may be configured such that the portion passed through the through hole of the leg is welded to a portion other than the top surface of the bottom of the leg. Specifically, as shown in FIG. 6, an opening 13B5 is formed in the bottom 13B1 of the leg 13, and the opening 13B5 of the panel 14 is passed through the through hole 13B4 of the leg 13 and set so as to come into surface contact with the bottom 13B1. The facing through portion 14A may be welded from below to the bottom portion 13B1 of the leg 13 through the opening 13B5 (welded portion W2).

Further, as shown in FIG. 7, an extension portion 14A1 is formed in the through-hole 14A of the panel 14 that is passed through the through-hole 13B4 of the leg 13, and the extension portion 14A1 is bent diagonally upward from the end that is in surface contact with the bottom portion 13B1 of the leg 13. This extension part 14A1 may be abutted against the inner surface of the outer part 13B3 (the other side part) of the leg 13 and welded (W3).

1 seat (vehicle seat)
2 Seat back 3 Seat cushion 10 Seat frame 11 Back frame 11A Recliner 12 Cushion frame 12A Control link 13 Leg 13A Long hole 13B U-shaped cross section 13B1 Bottom 13B2 Inside part (side part)
13B3 Outside part 13B4 Through hole 13B5 Opening 14 Panel 14A Through part 14A1 Extension part 14B Fixed part 14C 1st bead 14D 2nd bead F Floor W1 to W3 Welding part

Claims (6)

A seat frame having legs that support a vehicle seat against a floor, and reinforcing panels welded to the legs,
The leg is
a U-shaped cross section that opens upward and extends in the front and rear direction of the seat;
a through hole formed penetrating through the side of the U-shaped cross section, through which the panel is passed in the sheet width direction;
A seat frame comprising: a welding section for welding the panel to the U-shaped section with the panel passed through the through hole in contact with the bottom of the U-shaped section. The seat frame according to claim 1,
The seat frame includes a side portion of the U-shaped cross section having a flesh portion above the through hole that does not open the through hole upwardly. The seat frame according to claim 1 or claim 2,
The seat frame is provided with a seat frame in which the through hole is formed at a lower end portion of the side portion that opens the side of the bottom portion of the U-shaped cross section. The seat frame according to any one of claims 1 to 3,
A seat frame in which the welded portion is formed at the bottom of the U-shaped cross section. The seat frame according to any one of claims 1 to 4,
The through hole is divided into two parts in the front and back direction of the seat, and the panel is passed through each of the two divided through holes and welded to the U-shaped cross section. Seat frame with. The seat frame according to any one of claims 1 to 5,
The seat frame is arranged such that an upper edge of the side portion of the U-shaped cross section is higher than a fixed portion of the panel that is welded to the floor.

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