JP2020001550A - Seat cushion frame structure - Google Patents

Abstract

To reduce a weight of a cushion pad, and improve assemble work properties of a plurality of pressure reception members to a left/right pair of side frames.SOLUTION: A seat cushion frame structure comprises: a rear frame 12a; a front frame 12b; a left/right pair of side frames 12c, 12d for connecting both end parts of the rear frame 12a and the front frame 12b; and a plurality of pressure reception members 31, 32 which are fixed to the rear frame 12a, the front frame 12b, and the left/right pair of side frames 12c, 12d for receiving a load of an occupant. Each of the left/right pair of side frames 12c, 12d comprises: a plurality of end fixing parts 63, 64, 65 which are provided at a seat center side on the left/right pair of side frames 12c, 12d, and to which end parts of the pressure reception members 31, 32 are fixed. The plurality of end fixing parts 63, 64, 65 are arranged in a step-state so that a height position becomes higher as advances toward a front side.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a structure of a seat cushion frame in a vehicle seat.

Patent Literature 1 discloses a vehicle seat including a seat cushion and a seat back. In particular, the seat cushion frame that constitutes the skeleton of the seat cushion includes a rear frame, a front frame disposed in front of the rear frame, and a pair of left and right side portions connecting between both ends of the rear frame and the front frame. The vehicle includes a frame, a pair of vertically aligned central frames that connect between the central portions of the rear frame and the front frame, and a plurality of wires (pressure receiving members) that support cushion pads in the seat cushion.
In the plurality of wires, a plurality of front and rear wires bridged between the rear frame and the front frame, and bridged between a pair of left and right side frames or between a pair of left and right side frames and the center frame. A plurality of left and right wires are included, and the plurality of front and rear wires and the plurality of left and right wires are arranged so as to intersect with each other, and the intersections are joined.
In addition, on the center side of the seat cushion of the pair of side frames, an inner flange that forms an upward flat surface is provided, and on the upper surface of this inner flange, the ends of the left and right wires are placed and joined. I have.

Japanese Patent No. 6219683

By the way, in order to reduce the weight of the seat, there is a method of inclining the cushion pad so that the height increases toward the front, and reducing the thickness of the cushion pad by the amount of the inclination to reduce the weight.
When such a method is adopted, a plurality of front and rear wires among a plurality of wires supporting the cushion pad are inclined. However, if the plurality of front and rear wires are inclined, the upper surfaces of the inner flanges of the pair of side frames are separated from the ends of the plurality of left and right wires, and the ends of the plurality of left and right wires are bent. Height adjustment is required. For this reason, the weight of the cushion pad can be reduced, but the work of assembling the wire is troublesome.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the weight of a cushion pad and to improve the workability of assembling a plurality of pressure receiving members to a pair of left and right side frames.

In order to solve the above problems, the invention described in claim 1 is:
A rear frame arranged at the rear,
A front frame disposed in front of the rear frame,
A pair of left and right side frames connecting between both ends of the rear frame and the front frame,
A plurality of pressure receiving members fixed to the rear frame, the front frame, and the pair of left and right side frames and receiving a load of an occupant;
Each of the pair of left and right side frames is provided on the center side of the sheet in each of the pair of left and right side frames, and has a plurality of end fixing portions to which ends of the plurality of pressure receiving members are fixed. Yes,
The plurality of end fixing portions are arranged in a stepped manner such that the height position increases toward the front.

According to a second aspect of the present invention, in the seat cushion frame structure according to the first aspect,
Each of the pair of left and right side frames has a through hole formed at a position other than a portion where the plurality of end fixing portions are provided.

The invention according to claim 3 is the seat cushion frame structure according to claim 1 or 2,
The plurality of pressure receiving members are a plurality of wires,
The plurality of wires include a wire bent in a substantially U-shape in plan view, and both ends of the substantially U-shaped wire are fixed at two end portions of the plurality of end fixing portions. It is characterized by being fixed to a part.

According to a fourth aspect of the present invention, in the seat cushion frame structure according to the third aspect,
The plurality of wires include a plurality of front and rear wires bridged between the rear frame and the front frame,
The plurality of front and rear wires are characterized in that both end portions protrude to one of right and left and are formed in a substantially U-shape in plan view.

According to a fifth aspect of the present invention, in the seat cushion frame structure according to any one of the first to fourth aspects,
An upper protruding wire is provided on the outer side of the seat of the pair of left and right side frames so as to protrude obliquely upward.

The invention according to claim 6 is the seat cushion frame structure according to any one of claims 1 to 5,
An intermediate strength member fixed to the outer peripheral surface of the rear frame and supporting the seat back frame is provided,
The intermediate strength member is formed into a U-shaped cross section, each having a web portion and flange portions provided on both side edges thereof, and is a first divided body combined with each other and integrated as the intermediate strength member And a second divided body,
Of the first divided body and the second divided body formed in a U-shaped cross section, the flange portion arranged on the rear frame side constitutes a fixing surface fixed to the outer peripheral surface of the rear frame. It is characterized by having.

According to a seventh aspect of the present invention, in the seat cushion frame structure according to the sixth aspect,
The rear frame is formed in a cylindrical shape,
The flange portion forming the fixing surface is curved along the outer peripheral surface of the cylindrical rear frame.

According to an eighth aspect of the present invention, in the seat cushion frame structure according to the sixth or seventh aspect,
It has a pair of upper and lower central frames spanned between the front frame and the intermediate strength member,
A rear end of the pair of upper and lower central frames is fixed to the intermediate strength member so as to be located above and below the rear frame, and a front end is fixed to the front frame. Features.

The invention according to claim 9 is the seat cushion frame structure according to claim 8,
Of the pair of upper and lower central frames, the front end of the upper central frame is welded to the front frame in a crushed state, and the front end of the lower central frame is connected to the front frame via a first bracket. Characterized in that it is fixed to

According to a tenth aspect of the present invention, in the seat cushion frame structure according to any one of the sixth to ninth aspects,
A support wire for supporting an article arranged in a luggage compartment provided rearward is fixed to a rear side surface at both longitudinal ends of the rear frame via a second bracket.

According to an eleventh aspect of the present invention, in the seat cushion frame structure according to the tenth aspect,
In the rear frame, an energy absorbing wire for absorbing a forward load on the rear frame, which is provided obliquely rearward and downward on the center side of the support wire, is fixed.

According to the first aspect of the present invention, since the plurality of end fixing portions to which the ends of the plurality of pressure receiving members are fixed are arranged stepwise so that the height position increases toward the front. If the ends of the plurality of pressure receiving members are fixed to the plurality of end fixing portions, the cushion pads placed on the plurality of pressure receiving members can be inclined. Therefore, the thickness of the cushion pad can be reduced by an amount corresponding to the inclination, and the weight can be reduced.
Furthermore, if the ends of the plurality of pressure receiving members are placed and fixed on the plurality of end fixing portions arranged in a stepped manner, the cushion pad can be inclined, so it is necessary to process the ends of the plurality of pressure receiving members. In addition, the workability of assembling the plurality of pressure receiving members to the pair of left and right side frames can be improved.

  According to the second aspect of the present invention, since each of the pair of left and right side frames has a through hole formed at a position other than a portion where the plurality of end fixing portions are provided, the pair of left and right side portions is provided. The weight of the frame can be reduced.

  According to the invention described in claim 3, both ends of the substantially U-shaped wire as the pressure receiving member are fixed to two end fixing portions of the plurality of end fixing portions, so that two at a time. The main wires can be installed at the two end fixing portions, and the workability of assembling the plurality of pressure receiving members to the seat cushion frame can be improved.

  According to the fourth aspect of the present invention, since the plurality of front and rear wires can be bridged between the rear frame and the front frame with the right and left reversed, the assembling work of the plurality of front and rear wires on the seat cushion frame can be performed. Performance can be improved.

  According to the fifth aspect of the present invention, since the upper protruding wire disposed so as to protrude obliquely upward is provided on the outer side of the seat of the pair of left and right side frames, the position where the upper protruding wire is located. The reliability in supporting the occupant sitting on (both ends of the seat cushion) is increased.

According to the invention described in claim 6, for example, each of the first divided body and the second divided body constituting the intermediate strength member has a web portion and a flange portion provided on one side edge thereof, and has a cross section L Compared to the case of being formed in a character shape, not only can the rigidity of the first divided body and the second divided body be improved, but also the rigidity of the intermediate strength member in which these are combined and integrated can be improved.
Furthermore, since the flange portion arranged on the rear frame side of the first divided body and the second divided body formed in a U-shaped cross section forms a fixing surface fixed to the outer peripheral surface of the rear frame. As a result, the contact area of the rear frame with the outer peripheral surface is increased, and the fixing strength of the first divided body and the second divided body to the rear frame can be improved.

  According to the invention as set forth in claim 7, since the flange portion forming the fixing surface in the curved state can be fixed along the outer peripheral surface of the rear frame, the first divided body and the second divided body with respect to the rear frame. Can improve the fixing strength.

  According to the invention described in claim 8, the truss structure can be formed by the pair of upper and lower central frames, the intermediate strength member, and the front frame, so that the rigidity of the entire seat cushion frame can be improved.

According to the ninth aspect of the present invention, the bending of the front frame can be suppressed as compared with a case where both the pair of upper and lower central frames are directly welded to the front frame.
Furthermore, since the front end of the lower central frame is fixed to the front frame via the first bracket, the joining strength of the lower central frame to the front frame can be improved, and the rigidity at the joint portion can be improved. Can be improved.

According to the tenth aspect of the present invention, it is possible to support articles such as luggage, fixtures, and storage devices arranged in the luggage compartment by the support wires fixed to the rear frame. A structure for supporting the article can be formed more easily than when another structure for supporting is adopted.
Further, since the support wire is fixed to the rear frame via the second bracket, for example, as compared with a case where the support wire is fixed to the rear frame by “staking”, the “staking” is performed to the rear frame. It is not necessary to perform processing for "", and the strength of the rear frame can be improved.

  According to the eleventh aspect of the present invention, the impact when the luggage stored in the luggage room strongly collides with the rear frame can be reduced by the energy absorbing wire, so that the rear frame and, consequently, the seat cushion frame can be protected. .

It is a perspective view which shows a vehicle seat. It is a perspective view when the seat frame is seen from the front. It is a perspective view when the seat frame is seen from the rear. It is a perspective view which shows the left end part of a seat frame. It is a perspective view which shows the mounting structure of the front end part in a pair of upper and lower center part frames. It is a front view when the left end of a seat frame is seen from the bottom side. It is a perspective view showing an example of arrangement of a plurality of pressure-receiving members. It is a perspective view which shows the right end part of a seat frame. It is a side view which shows a side part frame. It is a side view showing the state where a plurality of pressure-receiving members were fixed to a side frame. It is a perspective view showing the state where a plurality of pressure-receiving members were fixed to a side frame. It is a perspective view when the 1st divided body and the 2nd divided body are seen from back. It is a perspective view at the time of seeing an intermediate strength member from back.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, in the embodiments described below, various technically preferable limitations for carrying out the present invention are added, but the technical scope of the present invention is not limited to the following embodiments and illustrated examples. Absent.

In FIG. 1, reference numeral 1 indicates a vehicle seat. The vehicle seat 1 includes a seat cushion 2 that supports a person's buttocks and thighs, a seat back 3 that serves as a backrest, and a headrest 4 that supports a person's head.
Note that the vehicle seat 1 in the present embodiment is a rear seat (rear seat) of a passenger car. However, the present invention is not limited to this, and may be a seat other than a rear seat of a passenger car, a seat of another car such as a bus or a truck, or a seat of a vehicle other than a car such as a railway, a ship, or an aircraft.
In the passenger car on which the vehicle seat 1 of the present embodiment is installed, a luggage compartment R is provided behind the vehicle seat 1.

The vehicle seat 1 according to the present embodiment has one seat cushion 2 while two seat backs 3 and two headrests 4 accordingly.
The two seat backs 3 are provided at the rear end of the seat cushion 2 side by side in the left-right direction. The headrest 4 is provided at the center of the upper end of each of the two seatbacks 3.
Such a vehicle seat 1 is schematically shown in FIG. 2 and the like, and includes a seat frame 11 constituting a skeleton of the vehicle seat 1 and a cushion pad (not shown) supported by the seat frame 11. And the skin materials 2a, 3a, and 4a that cover the seat frame 11 and the cushion pad.

The seat frame 11 includes a seat cushion frame 12 that forms a skeleton of the seat cushion, a seatback frame 13 that forms a skeleton of the seatback 3, and a headrest frame 14 that forms a skeleton of the headrest 4.
The cushion pad and the skin materials 2a, 3a, 4a are provided on the seat cushion frame 12, the seat back frame 13, and the headrest frame 14, respectively.

As shown in FIGS. 1 to 6 and the like, the seat cushion frame 12 includes a rear frame 12a, a front frame 12b, a pair of left and right side frames 12c and 12d, a pair of upper and lower central frames 12e and 12f, Is provided.
Further, a plurality of pressure receiving members 30, 31, 32 for receiving the load of the occupant are fixed to the rear frame 12a, the front frame 12b, and the pair of left and right side frames 12c, 12d.
Further, on the lower surface of the seat cushion frame 12, a slide mechanism 40 for slidingly moving the seat cushion 2, and hence the entire vehicle seat 1, is provided.

The rear frame 12a is disposed at the rear of the seat cushion frame 12 in the left-right direction, and is configured by a large-diameter pipe frame (that is, formed in a cylindrical shape).
The front frame 12b is disposed in the left and right direction at the front of the seat cushion frame 12, and is formed of a pipe frame (that is, formed in a cylindrical shape).
The rear frame 12a and the front frame 12b are arranged parallel to each other. The front frame 12b is arranged above the rear frame 12a.

The pair of left and right side frames 12c and 12d are arranged in the front-rear direction at the right end and the left end of the seat cushion frame 12, and connect between both ends of the rear frame 12a and the front frame 12b.
More specifically, a high-rigidity pivot bracket 15 is provided at the rear ends of the pair of left and right side frames 12c and 12d, and a rear frame 12a is provided for the pivot bracket 15.
The pair of left and right side frames 12c and 12d and the pivot bracket 15 are both formed in a U-shaped cross section (also referred to as a channel cross section), and the pivot bracket 15 is provided inside the pair of left and right side frames 12c and 12d. Are fitted, and both bottoms are connected by bolts. That is, the rear frame 12a and the pair of left and right side frames 12c and 12d are connected via the pivot bracket 15.
At the upper end of the pivot bracket 15, a seat back frame 13 is provided rotatably in the front-rear direction.

The pair of upper and lower central frames 12e, 12f are arranged in the front-rear direction at the central portion of the seat cushion frame 12, and are provided so as to bridge between the rear frame 12a and the front frame 12b. Further, the pair of upper and lower central frames 12e and 12f are constituted by pipe frames.
More specifically, an intermediate strength member 20 fixed to the outer peripheral surface of the rear frame 12a and supporting the seat back frame 13 is provided at the center of the rear frame 12a. The pair of upper and lower central frames 12e and 12f are bridged between the front frame 12b and the intermediate strength member 20, and the rear end is positioned above and below the rear frame 12a to achieve intermediate strength. The front end is fixed to the member 20 and the front end is fixed to the front frame 12b.

Further, of the pair of upper and lower central frames 12e and 12f, the front end of the upper central frame 12e is welded to the front frame 12b in a crushed state (a vertically flattened state), and the lower central frame 12f The front end is fixed to the front frame 12b via the first bracket 17.
The first bracket 17 has a U-shaped cross section including a web portion and flange portions provided on both side edges thereof. More specifically, each flange portion is welded and fixed to the outer peripheral surface of the front frame 12b, and is welded to the lower surface of the web portion in a state where the front end of the lower central frame 12f is crushed (in a state where it is flattened vertically). Fixed.
The front ends of the pair of upper and lower central frames 12e and 12f are fixed by welding in a state where both are crushed. This makes it possible to secure a wider welding range and increase the strength of the welded portion, and also to increase the strength in the vertical direction. There is an advantage that the size can be reduced.

The intermediate strength member 20 is a box-shaped body including a first divided body 21 and a second divided body 22 that are combined with each other and integrated as the intermediate strength member 20, and the upper end of the seat back frame 13 A reclining bracket 16 constituting a reclining mechanism for adjusting the angle is provided. The seat back frame 13 is provided on the reclining bracket 16 so as to be rotatable in the front-rear direction.
The reclining mechanism is provided between the reclining bracket 16 and the seat back frame 13.
The operation unit 18 of the reclining mechanism is provided at the upper end of each of the two seat backs 3 at the center of the seat as shown in FIGS.

The plurality of pressure receiving members 30, 31, 32 are formed as a plurality of wires as shown in FIGS.
The plurality of wires 30, 31, and 32 include a plurality of front and rear wires 30 that are bridged between the rear frame 12a and the front frame 12b, and at least one end disposed in the left-right direction and having a pair of left and right side portions. Left and right wires 31, 32 fixed to one of the frames 12c, 12d are included. The plurality of front and rear wires 30 and the plurality of left and right wires 31 and 32 are arranged so as to intersect with each other, and intersections between the wires are joined.

The front and rear wires 30 include a long portion 30a formed to be long in the front and rear direction, an inclined portion 30b projecting obliquely upward from each of both ends of the long portion 30a, and left and right from the upper end of each of the two inclined portions 30b. And a fixed end 30c protruding to either side, and is formed in a substantially U-shape in plan view as a whole. The fixed end 30c is welded and fixed to the rear frame 12a and the front frame 12b.
That is, the two fixed ends 30c protrude in the same direction. The lengths of the two inclined portions 30b from the long portion 30a are equal, and the angles with respect to the long portion 30a are also set to be equal.
In the front and rear wires 30 having such a shape, the long portion 30a and the inclined portion 30b may be disposed at predetermined positions (positions as designed), and the fixed end 30c is disposed to face either left or right. Since there is no problem, the left and right directions can be reversed. In other words, when the front and rear wires 30 are bridged between the rear frame 12a and the front frame 12b and fixed by welding, the operation can be performed without regard to the direction of the fixed end 30c.

The left and right wires 31 and 32 include a first left and right wire 31 and a second left and right wire 32.
The first left and right wires 31 are formed to be long in the left and right direction. In the present embodiment, the right end is fixed to the right side frame 12c, and the left end is connected to the left side frame 12d. Fixed. The central portion of the first left and right wires 31 is curved along the upper surface of the lower central frame 12f of the pair of upper and lower central frames 12e and 12f, and is welded and fixed to the upper surface of the lower central frame 12f. ing. That is, the first left and right wires 31 are provided so as to span the pair of left and right side frames 12c and 12d via the lower central frame 12f.
The second left and right wires 32 are bent in a substantially U-shape (may be a U-shape in plan view) in plan view. One end and the other end of the second left and right wires 32 are fixed to the same side frame 12c (12d). Further, the second left and right wires 32 are set to have a length such that the bent portion does not reach the pair of upper and lower central frames 12e and 12f. A space without a pressure receiving member is formed between the bent portion of the second left and right wire 32 and the pair of upper and lower central frames 12e and 12f. Then, although not shown, the buckle of the seat belt is arranged using such a space.

As one of the pressure receiving members in the seat cushion frame 12, an upwardly projecting wire 33 is provided outside the seat cushion frame 12 in the pair of left and right side frames 12c and 12d so as to project obliquely upward. .
Describing in more detail, the upwardly projecting wire 33 has both ends fixed to the outer surfaces of the pair of left and right side frames 12c and 12d, and is provided so as to project obliquely upward from the fixing position. The upwardly protruding wire 33 includes a protruding portion 33a that protrudes obliquely upward from both ends, which are fixed ends, and a connecting portion 33b that connects upper ends of both protruding portions 33a, and a center of the connecting portion 33b is A downwardly protruding portion 33c that is bent in a substantially V shape and protrudes vertically downward is formed.
The upward protruding wire 33 can support, from below, a portion of the cushion pad placed on the seat cushion frame 12 that protrudes outside the pair of left and right side frames 12c and 12d. Therefore, the upwardly projecting wire 33 improves the durability of the vehicle seat 1 at the time of getting on and off the vehicle seat 1, and can exhibit the function of maintaining the original shape of the protruding portion of the cushion pad.

The slide mechanism 40 is provided between the lower surface of each of the pair of left and right side frames 12c and 12d and the floor panel of the vehicle, and the seat cushion frame 12, and thus the entire vehicle seat 1, is moved forward and backward of the vehicle. It can be slid along the direction.
Such a slide mechanism 40 includes a movable rail 41, a fixed rail 42, and a slide lock mechanism.

The movable rail 41 is formed to be long in the sliding direction (front-back direction), is fixed to the lower surfaces of the pair of left and right side frames 12c and 12d, and is provided inside the fixed rail 42 and slides on the fixed rail 42. It is movably supported.
The fixed rail 42 is formed to be long in the sliding direction (front-back direction), provided below the pair of left and right side frames 12c, 12d, and slidably supports the movable rail 41. On the lower surface of the fixed rail 42, a front foot bracket 43 and a rear foot bracket 44, which are fixed to the floor panel of the vehicle and support the whole of the vehicle seat 1, that is, the entire vehicle seat 1, are fixed.

  The slide lock mechanism is a known mechanism that is provided between the movable rail 41 and the fixed rail 42 and that can selectively lock the vehicle seat 1 at a plurality of front-back adjustment positions. A release lever 45 for releasing the locked state of the slide lock mechanism is pivotally supported on each movable rail 41, and a lock for urging the release lever 45 in the lock operating direction of the slide lock mechanism is provided on each release lever 45. A spring 46 is connected.

  Both ends of one common release bar 47 are connected to the left and right release levers 45. The release bar 47 is formed by bending a single round bar, and a pair of left and right arms 47a extending forward from the left and right release levers 45, and a rod unit integrally connecting the front ends of the arms 47a. 47b, and the rod portion 47b is disposed below the seat cushion frame 12 and parallel to the front edge of the seat cushion frame 12.

A knob 48 is fixed to the center of the rod portion 47b. The knob 48 projects from the front surface of the central portion of the rod portion 47b toward the front surface of the seat cushion frame 12, is formed in a U-shape, and is in a state where it can be easily gripped by hand.
By pulling up the knob 48, the release bar 47 swings upward together with the release lever 45 to release the locked state of the slide lock mechanism, and the movable rail 41 slides, that is, the longitudinal direction of the vehicle seat 1. The slide movement to is possible. After the front and rear positions of the vehicle seat 1 are adjusted, by releasing the knob 48, the slide lock mechanism is operated by the action of the lock spring 46, and the vehicle seat 1 can be locked at the adjusted position.

The slide lock mechanism can be operated not only by the knob 48 but also from behind the vehicle seat 1.
That is, the rear operation member 49 is provided so as to be exposed to the rear of the vehicle seat 1, and a Bowden cable 49a is connected to the rear operation member 49. The Bowden cable 49a includes an outer cable and an inner cable. The outer cable is wired and fastened along the upper central frame 12e. The inner cable has one end connected to the rear operation member 49 and the other end connected to the center of the release bar 47. By operating the rear operation member 49 to be pulled, the release bar 47 is pulled up via the inner cable, and the locked state of the slide lock mechanism can be released.
The front end of the outer cable is hooked and held by a notch 17a formed in the web of the first bracket 17, so that the inner cable can be guided to the release bar 47 side.
Further, on the flange portions on both side edges of the first bracket 17, there are provided regulating rings 19 which extend downward through the U-shaped inside of the knob 48. The regulating ring 19 is located forward of the first bracket 17, and for example, the skin material 2a or a trim cover (not shown) covering substantially the entire lower surface of the seat cushion 2 interferes with the Bowden cable 49a. It regulates that.

  At the lower portion of the center of the front end of the seat cushion 2, there is a concave portion 2b corresponding to the position of the knob 48 and formed to be recessed from the periphery. The knob 48 is configured such that at least a portion on the base end side (the release bar 47 side) is accommodated in the recess 2b. Therefore, the knob 48 can be prevented from protruding forward too much from the front end of the seat cushion 2.

  The seat cushion frame 12 has a support wire 50 attached to the basic structure as described above, which supports an article disposed in a luggage compartment R provided at the rear of the seat, and energy for absorbing a forward load on the rear frame 12a. An absorption wire 55 is provided.

The support wire 50 is formed by bending a single wire, and is disposed so as to protrude upward. The support wire 50 is fixed to the rear side surface at both ends in the longitudinal direction of the rear frame 12a via the second bracket 51.
The second bracket 51 has a web portion and flange portions provided on both side edges thereof, and is formed in a U-shaped cross section. More specifically, each flange portion is welded and fixed to the rear side surface of the rear frame 12a, and both ends of the support wire 50 are inserted and welded and fixed to two through holes formed in the web portion.
The articles supported by the support wires 50 include various articles such as luggage, fixtures, and storage tools arranged in the luggage compartment R, and are not particularly limited. The article is hooked or fixed to the support wire 50 so that the article can be reliably supported by the support wire 50.

  The energy absorbing wire 55 is formed by bending a single wire, and is provided in the rear frame 12a so as to protrude obliquely downward and rearward toward the center side of the support wire 50 from the support wire 50. In addition, both ends of the energy absorbing wire 55 are fixed to the upper side surface of the rear frame 12a.

There are two seat back frames 13 for one seat cushion frame 12. Each seat back frame 13 includes a frame body 13a having upper, lower, and left and right sides formed by a bent pipe frame, a pivot bracket 13b, and a side frame 13c.
The pivot bracket 13b is provided on an outer side of the frame body 13a, and is rotatably connected to the pivot bracket 15 of the seat cushion frame 12.
The side frame 13c is provided on the inner side of the frame body 13a, and is rotatably connected to the reclining bracket 16 of the seat cushion frame 12. A reclining mechanism is provided between the side frame 13c and the reclining bracket 16.
Note that a pillar holding portion 13d for holding the headrest pillar 14b of the headrest 4 is provided on the upper side of the frame body 13a.

The headrest frame 14 is provided at the center of the upper end of the seat back frame 13, and includes a frame main body 14a and a headrest pillar 14b protruding downward from the lower end of the frame main body 14a.
The headrest pillar 14b is held by a pillar holding portion 13d provided at the upper end of the seat back frame 13.

  Hereinafter, the vehicle seat 1 in the present embodiment will be described in more detail.

[About the side frames 12c and 12d and the plurality of pressure receiving members 30, 31, and 32]
The pair of left and right side frames 12c and 12d are formed in a U-shaped cross section (also referred to as a channel cross section) as described above. Therefore, the pair of left and right side frames 12c, 12d has a web portion 60 and flange portions 61, 62 provided on both side edges thereof, as shown in FIGS.
The web portion 60 forms the lower surface of the pair of left and right side frames 12c and 12d, and the flange portions 61 and 62 include an outer flange 61 located outside the seat and an inner flange 62 located near the center of the seat. include.

The front ends (refer to the longitudinal front ends of the side frames 12c and 12d) of the outer flange 61 and the inner flange 62 are a central portion and a rear end (the longitudinal center and rear portions of the side frames 12c and 12d). The vertical dimension is formed to be longer than that of the front end portion, and the height position at the upper end of the front end portion is set higher than the height positions of the center portion and the rear end portion.
At the upper ends of the front ends of the outer flange 61 and the inner flange 62, arc portions 61a and 62a on which the front frame 12b is mounted are formed. The front frame 12b formed in a cylindrical shape is mounted on the arc portions 61a and 62a and fixed by welding or the like. Therefore, the front frame 12b is arranged at a position higher than the rear frame 12a.

The upper end of the inner flange 62 is bent at a right angle in a direction opposite to the outer flange 61 (the center of the vehicle seat 1: the center of the seat cushion frame 12) and is stiffened ( It is formed in a flange shape.). In addition, the upper end of the inner flange 62 is not only stiffened by being bent in this way, but also wider than, for example, the upper end end surface when the upper end of the inner flange 62 is used without being bent. It is possible to configure the set upward surface.
The portion bent at a right angle in this manner includes a plurality of end fixing portions 63, 64, 65 to which ends of the left and right wires 31, 32, which are a plurality of pressure receiving members, are fixed. Further, the plurality of end fixing portions 63, 64, 65 are arranged in a stepped manner such that the height position increases toward the front.
The bent portion at the upper end of the inner flange 62 includes the above-described arc portion 62a, so that the front frame 12b can be stably supported.

Describing in more detail, the left and right wires 31 and 32 include the first left and right wires 31 elongated in the left and right direction as described above and the second right and left wires 32 formed in a substantially U shape in plan view. include. Therefore, three ends of the two types of left and right wires 31 and 32 face the pair of left and right side frames 12c and 12d.
That is, the plurality of end fixing portions 63, 64, 65 include a first end fixing portion 63 to which three ends of the left and right wires 31, 32 are fixed, a second end fixing portion 64, and a third end fixing portion 64. An end fixing portion 65 is included.

The first end fixing portion 63 is the lowest stage (lower stage) of the plurality of end fixing portions 63, 64, 65, and is the lowest in the arrangement order of the plurality of end fixing portions 63, 64, 65. One end of the second left and right wires 32 is placed and fixed rearward.
The second end fixing portion 64 is an intermediate stage (middle stage) of the plurality of end fixing portions 63, 64, 65. The other end of the second left and right wire 32 is placed and fixed in the middle.
The third end fixing portion 65 is the highest stage (upper stage) among the plurality of end fixing portions 63, 64, 65, and is the highest in the arrangement order of the plurality of end fixing portions 63, 64, 65. It is arrange | positioned ahead and the end part of the 1st right and left wire 31 is mounted and fixed.

On the upper surfaces of the first end fixing portion 63, the second end fixing portion 64, and the third end fixing portion 65, the portion where the ends of the first left and right wires 31 and the second left and right wires 32 are placed is a horizontal plane. Therefore, the first left and right wires 31 and the second left and right wires 32 can be stably supported when placed, and can be fixed thereon by welding or the like.
In the present embodiment, the upper surface of the first end fixing portion 63 is formed in a step shape (upper and lower stages), and one end of the second left and right wire 32 is placed on the upper surface of the lower stage. Has been fixed. The upper surface of the lower step on which one ends of the second left and right wires 32 are placed is a horizontal plane.

Further, since the first left and right wires 31 and the second left and right wires 32 are also placed on the front and rear wires 30 which are a plurality of pressure receiving members, the first left and right wires 31 and the second left and right wires 32 are connected to the front and rear wires 30 and respective end portions. It is in a state of being bridged between the fixing parts 63, 64, 65.
Therefore, the workability is excellent both when the first left and right wires 31 and the second left and right wires 32 are welded to the end fixing portions 63, 64, 65 and when the front and rear wires 30 are welded.

On the other hand, the upper end of the outer flange 61 is bent at a right angle in a direction opposite to the inner flange 62 (outside of the vehicle seat 1: outside of the seat cushion frame 12) and is stiffened ( It is formed in a flange shape.).
In addition, the above-described circular arc portion 61a is included, and the front frame 12b can be stably supported.

  Although the upper ends of the outer flange 61 and the inner flange 62 are bent and stiffened as described above, in the present embodiment, the upper flange is not bent at the position where the pivot bracket 15 is provided. And

Each of the pair of left and right side frames 12c and 12d has a through hole 66 formed at a position other than a portion where the plurality of end fixing portions 63, 64 and 65 are provided for weight reduction.
A plurality of through holes 66 in the present embodiment are formed in the web portions 60 in both the pair of left and right side frames 12c and 12d. However, the present invention is not limited to this, and may be formed on the outer flange 61 or the inner flange 62.
A portion 60a of the web portion 60 adjacent to the through hole 66 is processed so as to protrude downward, so that rigidity can be improved.

By employing the above configuration, the plurality of end fixing portions 63, 64, 65 makes it difficult to assemble the plurality of left and right wires 31, 32.
In this embodiment, the wires 30, 31, and 32 are used as the pressure receiving members. However, the present invention is not limited to this, and a plate-shaped pressure receiving member may be used. However, it is assumed that even such a plate-shaped pressure receiving member has an end which is mounted and fixed on the plurality of end fixing portions 63, 64, 65.

[About the intermediate strength member 20]
As shown in FIGS. 12 and 13, the first divided body 21 and the second divided body 22 constituting the intermediate strength member 20 are respectively composed of web portions 21 a and 22 a and flange portions 21 b and 22 b provided on both side edges thereof. It is formed in a U-shaped cross section (channel shape in cross section) having 21c and 22c. Further, the first divided body 21 and the second divided body 22 are formed as an arc-shaped body as a whole (may be referred to as a U-shaped shape, shape, appearance, or the like). The first divided body 21 and the second divided body 22 are combined with each other such that the opening sides opposite to the web portions 21a and 22a face each other.
The intermediate strength member 20 in a state where the first divided body 21 and the second divided body 22 are combined and integrated with each other is a box body by combining the first divided body 21 and the second divided body 22. (Box-shaped body). Further, since the first divided body 21 and the second divided body 22 are formed in an arc shape, the intermediate strength member 20 is also formed in an arc shape (U shape) as a whole.
The flange portions 21b, 22b, 21c, and 22c of the first divided body 21 and the second divided body 22 are flanged parts 21b, 22b (hereinafter, outer peripheral flange parts 21b, 22b) constituting the outside of the “arc”. ), And flange portions 21c, 22c (hereinafter, referred to as inner peripheral flange portions 21c, 22c) that constitute the inside of the “arc”.

The web portions 21 a and 22 a of the first divided body 21 and the second divided body 22 constitute left and right side surfaces of the intermediate strength member 20.
The web portion 21a of the first split body 21 and the web portion 22a of the second split body 22 are formed substantially symmetrically and symmetrically, but the web portion 21a of the first split body 21 is The area is set slightly larger (by the thickness of the outer peripheral flange portion 21b) than the web portion 22a of the body 22.
The reclining bracket 16 is fixed to the upper ends of the web portions 21a and 22a.
The plurality of through holes formed in the web portions 21a and 22a allow a shaft portion of a bolt used for connection with the reclining bracket 16 and other members to be inserted, and also contribute to weight reduction.

The outer flange portions 21b and 22b are set to have a longer projecting dimension from the web portions 21a and 22a to the side than the inner peripheral flange portions 21c and 22c. When the first divided body 21 and the second divided body 22 are combined, the outer peripheral flange portions 21b and 22b are overlapped and joined by welding or the like. In this case, in the present embodiment, it is assumed that the outer peripheral flange portion 21b of the first divided body 21 is overlapped so as to be located outside the outer peripheral flange portion 22b of the second divided body 22. Note that, in order to make the outer peripheral flange portion 21b of the first divided body 21 cover the outer peripheral flange portion 22b of the second divided body 22 from above, the web portion 21a of the first divided body 21 is in the second position. It is assumed that the area is set slightly larger than the web portion 22a of the two-piece body 22.
Further, in the present embodiment, the outer peripheral flange portion 21b of the first divided body 21 is set to have a longer laterally protruding dimension than the outer peripheral flange portion 22b of the second divided body 22.
The outer peripheral flange portion 21b of the first divided body 21 also has a long laterally protruding dimension, and is provided so as to cover the outer peripheral flange portion 22b of the second divided body 22 from above. The rear ends of the central frames 12e, 12f are fixed to the outer peripheral flange 21b of the first split body 21.

  Further, a cable holding portion 23 for holding the Bowden cable 49a is integrally formed at the upper end on the front side of the outer peripheral flange portion 21b of the first split body 21. The cable holding portion 23 is provided so as to protrude upward, has an upper end portion forked, and can hold the Bowden cable 49a by a forked end portion. The cable holding portion 23 is disposed between the left and right reclining brackets 16 fixed to the upper ends of the web portions 21a and 22a.

In the inner peripheral flange portions 21c and 22c, the laterally projecting dimension from the web portions 21a and 22a is set shorter than the laterally projecting dimension in the outer peripheral flange portions 21b and 22b.
Then, in a state where the outer peripheral flange portion 21b of the first divided body 21 is overlapped with the outer peripheral flange portion 22b of the second divided body 22, the inner peripheral flange portion 21c of the first divided body 21 and the second divided body The inner peripheral flange portion 22d of 22 is in a state where the end faces are spaced from each other and face each other. That is, the inner peripheral flange portions 21c, 22c of the first divided body 21 and the second divided body 22 do not overlap each other like the outer peripheral flange parts 21b, 22b, but have a symmetrical positional relationship and the same arc. It is provided so as to draw. In other words, a gap is formed between the inner peripheral flange portions 21c, 22c of the first divided body 21 and the second divided body 22, whereby the intermediate strength member 20 is directed upward. Open.
The first divided body 21 and the second divided body 22 formed in a U-shape in cross section also have both ends in the extending direction thereof (both ends in an arc-shaped and U-shaped form) open. . However, of the two ends in the extending direction, the front end (the end where the cable holding portion 23 is located) has the outer peripheral flange portions 21b and 22b bent rearward, and the open state is the rear end. Is slightly narrower than the open state at the end (end without the cable holding portion 23).
The inner peripheral flange portions 21c and 22c of the first divided body 21 and the second divided body 22 are fixed surfaces fixed to the outer peripheral surface of the rear frame 12a. That is, after the rear frame 12a is disposed on the inner peripheral side of the intermediate strength member 20 formed in an arc shape and comes into contact with the inner peripheral flange portions 21c and 22c forming the inner peripheral surface, the inner peripheral flange is formed. The portions 21c and 22c are fixed to the rear frame 12a by welding or the like.
Since the rear frame 12a is connected to the intermediate strength member 20 in this manner, the inner peripheral flange portions 21c and 22c are curved along the outer peripheral surface of the rear frame 12a formed in a cylindrical shape. It has become.
Although a gap is formed between the inner peripheral flange portions 21c and 22c of the first divided body 21 and the second divided body 22 as described above, the rear frame 12a is provided across the gap and the inside is formed. It is fixed to the peripheral flange portions 21c and 22c. Therefore, even if a gap is formed between the inner peripheral flange portions 21c and 22c, the rigidity of the intermediate strength member 20 can be improved.

  By adopting the above configuration, the torsional rigidity of the rear frame 12a can be improved by the intermediate strength member 20 as compared with the related art.

According to the present embodiment, the plurality of end fixing portions 63, 64, 65 to which the ends of the plurality of left and right wires 31, 32, which are the plurality of pressure receiving members, are fixed, the height position increases toward the front. Since the end portions of the left and right wires 31 and 32 are fixed to the end fixing portions 63, 64 and 65, they are placed on the left and right wires 31 and 32. The cushion pad can be inclined. Therefore, the thickness of the cushion pad can be reduced by an amount corresponding to the inclination, and the weight can be reduced.
Furthermore, if the ends of the plurality of left and right wires 31, 32 are placed and fixed on the plurality of end fixing portions 63, 64, 65 arranged in a stepped manner, the cushion pad can be inclined, so that the plurality of left and right wires 31 There is no need to process the end portions of the left and right wires 31 and 32, and the workability of assembling the left and right wires 31 and 32 to the pair of left and right side frames 12c and 12d can be improved.

  In addition, since each of the pair of left and right side frames 12c and 12d has a through hole 66 formed at a position other than the portion where the plurality of end fixing portions 63, 64 and 65 are provided, a pair of left and right side frames is provided. The weight of the frames 12c and 12d can be reduced.

  Further, since both ends of the substantially U-shaped wire 32 as the pressure receiving member are fixed to two end fixing portions 63, 64 of the plurality of end fixing portions 63, 64, 65, two ends at a time. The main wires 32 can be installed on the two end fixing portions 63 and 64, and the workability of assembling the left and right wires 31 and 32 to the seat cushion frame 12 can be improved.

  Further, since the plurality of front and rear wires 30 can be bridged between the rear frame 12a and the front frame 12b with the right and left reversed, the workability of assembling the plurality of front and rear wires 30 to the seat cushion frame 12 can be improved. .

  Further, since the upper protruding wire 33 is provided on the outer side of the seat of the pair of left and right side frames 12c and 12d so as to protrude obliquely upward, the position where the upper protruding wire 33 is located (the seat cushion 2). At both ends of the vehicle).

Further, for example, each of the first divided body 21 and the second divided body 22 constituting the intermediate strength member 20 has web sections 21a, 22a and flange sections 21b, 22b provided on one side edge thereof, and has a cross section L The rigidity of the first divided body 21 and the second divided body 22 can be improved as compared with the case where the intermediate strength member 20 is formed by combining the first divided body 21 and the second divided body 22 with each other. Can be improved.
Further, of the first divided body 21 and the second divided body 22 formed in a U-shaped cross section, the inner peripheral flange portions 21c, 22c arranged on the rear frame 12a side are fixed to the outer peripheral surface of the rear frame 12a. Since the fixed surface is formed, the contact area with the outer peripheral surface of the rear frame 12a increases, and the fixing strength of the first divided body 21 and the second divided body 22 to the rear frame 12a can be improved.

  Further, since the inner peripheral flange portions 21c and 22c constituting the fixed surface in the curved state can be fixed along the outer peripheral surface of the rear frame 12a, the first divided body 21 and the second divided body 22 with respect to the rear frame 12a. Can improve the fixing strength.

  Further, since the truss structure can be formed by the pair of upper and lower central frames 12e, 12f, the intermediate strength member 20, and the front frame 12b, the rigidity of the entire seat cushion frame 12 can be improved.

Further, of the pair of upper and lower central frames 12e and 12f, the front end of the upper central frame 12e is welded to the front frame 12b in a crushed state, and the front end of the lower central frame 12f is The front frame 12b is fixed to the front frame 12b via the base frame, so that the bending of the front frame 12b can be suppressed as compared with a case where both the pair of upper and lower central frames 12e and 12f are directly welded to the front frame 12b. .
Furthermore, since the front end of the lower central frame 12f is fixed to the front frame 12b via the first bracket 17, the joining strength of the lower central frame 12f to the front frame 12b can be improved, The rigidity at the joint can be improved.

Also, since articles such as luggage, fixtures, and storage tools arranged in the luggage compartment R can be supported by the support wires 50 fixed to the rear frame 12a, for example, for supporting the articles in the luggage compartment R, A structure for supporting the article can be formed more easily than when another structure is employed.
Further, since the support wire 50 is fixed to the rear frame 12a via the second bracket 51, for example, as compared with the case where the support wire 50 is fixed to the rear frame 12a by "caulking", It is not necessary to perform a process for “caulking” on the rear frame 12a, and the strength of the rear frame 12a can be improved.

  In addition, since the impact when the luggage stored in the luggage compartment R strongly collides with the rear frame 12a can be reduced by the energy absorbing wire 55, the rear frame 12a and, consequently, the seat cushion frame 12 can be protected.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat cushion 2a Skin material 2b Depression 3 Seat back 4 Headrest 11 Seat frame 12 Seat cushion frame 12a Rear frame 12b Front frame 12c Side frame 12d Side frame 12e Upper center frame 12f Lower center frame 13 seat back frame 14 headrest frame 16 reclining bracket 17 first bracket 19 regulating ring 20 intermediate strength member 21 first divided body 21a web portion 21b outer peripheral flange portion 21c inner peripheral flange portion 22 second divided body 22a web portion 22b outer peripheral flange portion 22c Inner peripheral flange portion 23 Cable holding portion 30 Front and rear wires 30a Long portion 30b Inclined portion 30c Fixed end 31 First left and right wire 32 Second left and right wire 33 Upward projecting wire 33a Projection Protruding part 33b Connecting part 33c Lower projecting part 40 Slide mechanism 41 Movable rail 42 Fixed rail 43 Front foot bracket 44 Rear foot bracket 45 Release lever 46 Lock spring 47 Release bar 47a Arm 47b Rod 48 Knob 49 Operating member 49a for rear Bowden cable 50 Support wire 51 Second bracket 52 Hook member 55 Energy absorption wire 60 Web part 61 Outer flange 62 Inner flange 63 First end fixing part 64 Second end fixing part 65 Third end fixing part 66 Through hole

Claims (11)

A rear frame arranged at the rear,
A front frame disposed in front of the rear frame,
A pair of left and right side frames connecting between both ends of the rear frame and the front frame,
A plurality of pressure receiving members fixed to the rear frame, the front frame, and the pair of left and right side frames and receiving a load of an occupant;
Each of the pair of left and right side frames is provided on the center side of the sheet in each of the pair of left and right side frames, and has a plurality of end fixing portions to which ends of the plurality of pressure receiving members are fixed. Yes,
The seat cushion frame structure, wherein the plurality of end fixing portions are arranged in a stepped manner so that a height position increases toward the front.   2. The seat cushion frame structure according to claim 1, wherein each of the pair of left and right side frames has a through hole formed at a position other than a portion where the plurality of end fixing portions are provided. 3. The plurality of pressure receiving members are a plurality of wires,
The plurality of wires include a wire that is bent into a substantially U shape in a plan view, and both ends of the substantially U-shaped wire are fixed at two end portions of the plurality of end fixing portions. The seat cushion frame structure according to claim 1, wherein the seat cushion frame structure is fixed to a portion. The plurality of wires include a plurality of front and rear wires bridged between the rear frame and the front frame,
4. The seat cushion frame structure according to claim 3, wherein each of the plurality of front and rear wires has a substantially U-shape in plan view, with both end portions protruding to one of right and left.   The upper projecting wire arranged so as to project obliquely upward is provided outside the seat cushion frame in the pair of left and right side frames. 2. The seat cushion frame structure according to 1. An intermediate strength member fixed to the outer peripheral surface of the rear frame and supporting the seat back frame is provided,
The intermediate strength member is formed into a U-shaped cross section, each having a web portion and flange portions provided on both side edges thereof, and is a first divided body combined with each other and integrated as the intermediate strength member And a second divided body,
Of the first divided body and the second divided body formed in a U-shaped cross section, the flange portion arranged on the rear frame side constitutes a fixing surface fixed to the outer peripheral surface of the rear frame. The seat cushion frame structure according to any one of claims 1 to 5, wherein: The rear frame is formed in a cylindrical shape,
7. The seat cushion frame structure according to claim 6, wherein the flange portion forming the fixing surface is curved along an outer peripheral surface of the rear frame having a cylindrical shape. 8. It has a pair of upper and lower central frames spanned between the front frame and the intermediate strength member,
A rear end of the pair of upper and lower central frames is fixed to the intermediate strength member so as to be located above and below the rear frame, and a front end is fixed to the front frame. The seat cushion frame structure according to claim 6 or 7, wherein:   Of the pair of upper and lower central frames, the front end of the upper central frame is welded to the front frame in a crushed state, and the front end of the lower central frame is connected to the front frame via a first bracket. The seat cushion frame structure according to claim 8, wherein the seat cushion frame structure is fixed to the seat cushion frame.   A support wire for supporting an article disposed in a luggage compartment provided at the rear is fixed to a rear side surface at both ends in a longitudinal direction of the rear frame via a second bracket. Item 10. The seat cushion frame structure according to any one of Items 6 to 9.   The energy absorbing wire for absorbing a forward load on the rear frame is fixed to the rear frame at a position closer to the center side than the support wire and obliquely rearward and downward, and is fixed to the rear frame. Seat cushion frame structure.

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