JP2024114531A - Vehicle seat - Google Patents

Abstract

To provide a vehicular seat configured so that a seat cushion frame can be reinforced and mass can be inhibited from increasing.SOLUTION: A front end part 26A of a center frame 26 is fixed to a portion closer to a front side than front end parts 22A and 24A of side frames 22 and 24 with respect to a vehicle body 31 side. In a rear seat 12, when baggage in a trunk collides with a seat back 16 and therefore the seat back 16 is bent in a nearly chevron-shape in plan view, an impact load is transmitted to a seat cushion 14 and loads that should be borne by the center frame 26 becomes larger than loads that are borne by the side frame 22 and 24. The center frame 26 is formed longer than the side frames 22 and 24, so that stress per a unit length in the center frame 26 can be smaller than stress per a unit length in the side frames 22 and 24, which can enhance bearing force. This can reinforce the center frame 26, and therefore can reinforce the frame against input into the seat cushion frame 20 and inhibit mass from increasing.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle seat.

The following Patent Document 1 discloses technology relating to folding seats. In this prior art, a main body support bracket that supports the main body of the reclining mechanism and a driven part support bracket that supports the driven part of the reclining mechanism are disposed at positions spaced a predetermined distance inward from the outer surface of the seat cushion or seat back. It is also described that an impact absorbing part is provided on at least one of these brackets, and that the impact energy input to the vehicle is absorbed by deforming the impact absorbing part.

Patent No. 5338813

However, in the above prior art, when the load (impact load) input to the vehicle body and seat cushion frame is large during the luggage compartment bulkhead test, the vehicle body and seat cushion frame need to be reinforced in order to withstand this load, which results in a significant increase in mass.

In consideration of the above, the present invention aims to provide a vehicle seat that can reinforce the seat cushion frame while preventing an increase in mass.

The vehicle seat according to the first aspect is provided with a seat cushion frame that is disposed rearward of the front seat in the vehicle interior in the longitudinal direction of the vehicle and that constitutes the framework of the seat cushion on which an occupant sits. The seat cushion frame includes a pair of side frames that extend along the longitudinal direction of the seat at both ends of the seat cushion frame in the seat width direction, and have first front ends in the longitudinal direction of the seat fixed to the vehicle body via first fixing parts, and a center frame that extends along the longitudinal direction of the seat at a central portion of the seat cushion frame in the seat width direction, and has a second front end in the longitudinal direction of the seat disposed forward of the first front ends in the longitudinal direction of the seat and fixed to the vehicle body via a second fixing part, and the center frame includes a pair of extension members disposed adjacent to each other in the seat width direction, and a bracket that integrates the pair of extension members.

In the vehicle seat according to the first aspect, the so-called rear seat is located rearward in the vehicle interior relative to the front seats in the vehicle longitudinal direction, and the seat cushion frame that constitutes the framework of the seat cushion on which the occupant sits is configured to include a pair of side frames and a center frame.

In this embodiment, the pair of side frames extend along the front-rear direction of the seat at both ends of the seat cushion frame in the seat width direction, and the first front ends of the pair of side frames in the front-rear direction of the seat are fixed to the vehicle body via first fixing parts.

In this embodiment, the center frame extends in the seat front-rear direction at the center of the seat cushion frame in the seat width direction. The second front end of the center frame in the seat front-rear direction is located forward of the first front end of the side frame in the seat front-rear direction, and the second front end is fixed to the vehicle body via the second fixing portion.

For example, in the rear seat, when the vehicle suddenly decelerates, the force of inertia causes luggage in the luggage compartment to collide with the back of the seat back, bending the seat back into a roughly V-shape in a plan view, and if an impact load is transmitted from the seat back to the seat cushion, stress is concentrated in the center of the seat cushion in the seat width direction. In other words, the load that the center frame must support is greater than that of the pair of side frames.

Therefore, in this embodiment, by making the length of the center frame longer than that of the pair of side frames, it is possible to reduce the stress per unit length of the center frame compared to the side frames. As a result, in this embodiment, the strength of the center frame can be improved accordingly, and as a result, it is possible to reinforce the center frame.

Here, in this embodiment, the center frame is configured to include a pair of extension members and a bracket. The pair of extension members are arranged next to each other (left and right) in the seat width direction, and the pair of extension members are integrated by the bracket.

In this manner, in this embodiment, by configuring the center frame with two extending members arranged on the left and right, when an impact load is transmitted from the seat back to the seat cushion, the load transmitted to the center frame can be dispersed. As a result, in this embodiment, it is possible to reduce the load resistance required for the extending members.

In addition, in this embodiment, the pair of extension members are integrated by a bracket. As a comparative example, if the bracket is not provided, the position of the front end portion of the pair of extension members (the second front end portion of the center frame) may differ between the left and right sides in the up-down direction of the seat due to their own weight.

In contrast, in this embodiment, the pair of extension members are integrated by the bracket, making it possible to suppress variation in the up-down direction of the seat at the front ends of the pair of extension members.

The vehicle seat according to the second aspect is the vehicle seat according to the first aspect, in which the bracket includes a pair of support pieces that form the second front end and adjustably support the third front end of each of the pair of extension members in the seat front-rear direction along the seat front-rear direction.

In the vehicle seat according to the second aspect, the bracket constitutes the second front end of the center frame. The bracket also includes a pair of support pieces that adjustably support the third front ends of the pair of extension members in the front-rear direction of the seat along the front-rear direction of the seat.

Therefore, in this aspect, even if there is variation in the pair of extension members in the fore-and-aft direction of the seat, the variation can be adjusted by the pair of support pieces, and the positional accuracy of the second fixing part fixed to the vehicle body can be ensured. In this way, in this aspect, by ensuring the positional accuracy of the second fixing part, it is possible to reliably and easily fix it to the vehicle body.

The vehicle seat according to the third aspect is the vehicle seat according to the first or second aspect, in which the bracket is crank-shaped in a side view of the seat, and the second fixing portion is formed so as to be positioned lower in the seat up-down direction than the third front end portion.

In the vehicle seat according to the third aspect, the bracket is crank-shaped in a side view of the seat, and is formed so that the second fixing portion to which the pair of extension members are fixed is disposed below the third front ends of the pair of extension members. In this way, by using a bracket that is crank-shaped in a side view of the seat, it is possible to absorb the height difference that occurs between the third front ends of the pair of extension members and the second fixing portion.

Therefore, in this embodiment, there is no need to change the shape of the pair of extension members to match the position of the second fixing portion, and the extension members can be fixed while they are extended in the front-rear direction of the seat. In other words, in this embodiment, the shape of the extension members can be simplified, which makes it possible to reduce costs.

The vehicle seat according to the fourth aspect is the vehicle seat according to any one of the first to third aspects, in which the center frame is fixed via the second fixing portion to a cross member arranged along the seat width direction on the vehicle body side.

In the vehicle seat according to the fourth aspect, a cross member is used that is arranged along the seat width direction on the vehicle body side. The cross member is a skeletal member on the vehicle body side, and therefore has high rigidity and strength. Therefore, by fixing the center frame to the cross member via the second fixing portion, it is possible to increase the load-bearing capacity of the seat cushion frame.

The vehicle seat according to the fifth aspect is the vehicle seat according to any one of the first to fourth aspects, further comprising a lower frame that constitutes the lower end in the seat vertical direction of the seat back frame that constitutes the skeleton of the seat back that constitutes the front end of the luggage compartment of the vehicle and is provided along the seat width direction, and the pair of extension members are configured to include a pair of first extension parts whose rear end in the seat front-rear direction is connected to the lower frame, and a pair of second extension parts whose rear end in the seat front-rear direction is connected to the first extension parts and whose front end in the seat front-rear direction is the third front end.

In the vehicle seat according to the fifth aspect, a lower frame that constitutes the lower end of the seat in the vertical direction is provided along the seat width direction in a seatback frame that constitutes the framework of the seatback that constitutes the front end of the luggage compartment of the vehicle. The pair of extension members each include a pair of first extension portions and a pair of second extension portions. The first extension portions have rear ends in the front-rear direction of the seat that are connected to the lower frame.

On the other hand, the second extension portion is supported by a pair of support pieces provided on the bracket, with the rear end of the second extension portion in the seat front-rear direction being connected to the first extension portion, and the front end of the second extension portion in the seat front-rear direction being the third front end of the pair of extension members in the seat front-rear direction.

In this manner, in this aspect, the extension member is composed of a first extension portion and a second extension portion along the longitudinal direction, which makes it possible to increase rigidity compared to when the extension member is formed from a single member. Note that the extension member may also include a separate extension portion that becomes the third extension portion between the first extension portion and the second extension portion. In this case, the first extension portion and the third extension portion are combined together to form the first extension portion.

The vehicle seat of the present invention has the excellent effect of reinforcing the seat cushion frame against input and preventing an increase in mass.

1 is a perspective view showing a vehicle seat according to an embodiment of the present invention; 1 is a plan view showing a seat cushion frame of a vehicle seat according to an embodiment of the present invention; 2 is an exploded perspective view showing a main portion of a seat cushion frame of the vehicle seat according to the present embodiment. FIG. 2 is a partially exploded perspective view of a main portion of a seat cushion frame of the vehicle seat according to the present embodiment; FIG. 2 is a perspective view showing a main portion of a seat cushion frame of the vehicle seat according to the present embodiment. FIG. 2 is a side view showing a main portion of a seat cushion frame of the vehicle seat according to the present embodiment. FIG.

Below, a vehicle seat according to an embodiment of the present invention will be described with reference to the drawings. In the drawings, the arrow FR indicates the forward direction in the front-to-rear direction of the seat, the arrow UP indicates the upward direction in the up-down direction of the seat, and the arrow RH indicates the right direction in the width direction of the seat. In the following, when the directions of front-to-rear, left-to-right, and up-to-down are used in the description, they refer to front-to-rear in the front-to-rear direction of the seat, left-to-right in the width direction of the seat, and up-to-down in the up-to-down direction of the seat, unless otherwise specified.

(Configuration of vehicle seat)
First, the configuration of the vehicle seat according to this embodiment will be described.

As shown in FIG. 1, the vehicle seat according to this embodiment is a rear seat 12 that is located rearward of the front seat (not shown) of the vehicle 10 in the vehicle front-rear direction. The rear seat 12 is broadly divided into a seat cushion 14 that supports the buttocks and thighs of a seated occupant, a seat back 16 that can support the upper body of the seated occupant seated on the seat cushion 14, and a headrest 18 that can support the head of the seated occupant.

The seat cushion 14 includes a seat cushion frame 20 that forms the framework of the seat cushion 14. The seat cushion frame 20 includes a pair of side frames 22, 24 and a center frame 26, and the pair of side frames 22, 24 extend along the front-rear direction of the seat at both ends of the seat cushion frame 20 in the seat width direction.

The center frame 26 extends in the front-rear direction of the seat at the center of the seat width direction of the seat cushion frame 20. A wire frame (not shown) is stretched between the pair of side frames 22, 24 and the center frame 26, and is capable of supporting a seat cushion pad that constitutes part of the seat cushion 14.

As shown in FIG. 2, the side frames 22, 24 have front ends (first front ends) 22A, 24A and rear ends 22B, 24B fixed to the vehicle body 31 via fixing parts (first fixing parts) 28 and fixing parts 30, respectively.

The center frame 26 is longer in the front-rear direction of the seat than the side frames 22, 24. The center frame 26 has a front end (second front end) 26A and a rear end 26B fixed to the vehicle body 31 via a fixing portion (second fixing portion) 32 and a fixing portion 33, respectively, and the fixing portion 32 is positioned forward of the fixing portion 28.

Now, we will explain the center frame 26.

The center frame 26 is configured to include a pair of extension members 34, 36 and a bracket 38. The pair of extension members 34, 36 are arranged adjacent to each other on the left and right along the seat width direction, and the front end 34A of the extension member 34 and the front end 36A of the extension member 36 are connected by the bracket 38. The extension members 34, 36 are each configured to include an extension portion (first extension portion) 40 and an extension portion (second extension portion) 42.

The extensions 40, 42 each extend along the front-rear direction of the seat, with the front end 40A of the extension 40 being connected to the rear end 42A of the extension 42. The rear end 40B of the extension 40 is connected to a lower frame 46 that constitutes the lower end 44A of the seatback frame 44 that forms the framework of the seatback 16.

As shown in FIG. 3, the extension 40 is composed of an upper frame 48 and a lower frame 50. The upper frame 48 has a cross-sectional shape cut along the sheet width direction that is roughly an inverted U-shape with an opening on the lower side and rounded (or chamfered) corners. The lower frame 50 has a cross-sectional shape cut along the sheet width direction that is roughly U-shaped with an opening on the upper side and rounded (or chamfered) corners.

A closed cross-section is formed when the upper frame 48 and the lower frame 50 are joined vertically. As a result, although not shown, in this embodiment, compared to when the extension portion has an open cross-section, the rigidity of the extension portion 40 is improved and impact loads input from the rear side of the extension portion 40 can be transmitted along the front-to-rear direction of the seat.

The side walls 48A and 48B of the upper frame 48 have rectangular cutouts 48A1 and 48B1 at the rear, respectively, that are cut upward to match the shape of the lower frame 46. The upper frame 48 and the lower frame 50 are joined together so as to sandwich the lower frame 46 from above and below.

As a result, the impact load input from the rear side of the extension 40 can be transmitted and dispersed along the seat width direction via the lower frame 46. As shown in Figures 3 and 4, the shapes of the cutouts 48A1 and 48B1 may be different to avoid interference with surrounding components, etc.

As shown in FIG. 2, the upper frame 48 and the lower frame 50 are formed so that the width dimension along the seat width direction is larger on the front side of the lower frame 46 than on the rear side. This makes it possible to further suppress deformation along the seat width direction on the front side of the lower frame 46 in the extension portion 40.

Furthermore, the pair of extensions 40 are formed such that the width dimension along the sheet width direction increases toward each other on the opposing opposing surfaces 41 side. This makes it possible to avoid interference with surrounding components on the outer side of the extension members 34, 36 in the sheet width direction.

In addition, a trapezoidal metal plate 52 is spanned between the front side of the lower frame 50 on the extension member 34 side and the front side of the lower frame 50 on the extension member 36 side.

On the other hand, the extension portion 42 is formed in a rectangular tube shape with rounded (or chamfered) corners, and the rear end portion 42A of the extension portion 42 is connected in a state where it is sandwiched between the upper frame 48 and the lower frame 50 of the extension portion 40. In addition, a trapezoidal metal plate 54 is bridged between the front end portion 42B of the extension portion 42 on the extension member 34 side and the front end portion 42B of the extension portion 42 on the extension member 36 side.

As shown in FIG. 6, the bracket 38 is crank-shaped in side view of the seat and includes support pieces 56, 58 extending along the seat front-rear direction and a fixed piece 60 extending along the seat width direction. Since the support pieces 56, 58 and the fixed piece 60 are at different positions in the seat up-down direction, connecting pieces 62, 64 are provided between the support pieces 56, 58 and the fixed piece 60 to connect them.

As shown in FIG. 3, the support pieces 56, 58 and the connecting pieces 62, 64 each have a cross-sectional shape cut along the sheet width direction that is generally U-shaped with an opening at the top. The front end 42B of the extension portion 42 on the extension member 34 side is supported by the support piece 56 while placed on the support piece 56, and the front end 42B of the extension portion 42 on the extension member 36 side is supported by the support piece 58 while placed on the support piece 58.

In addition, bead portions 62A, 64A that protrude upward are formed in the center of the connecting pieces 62, 64 in the seat width direction along the extending direction of the connecting pieces 62, 64, respectively, improving the rigidity of the connecting pieces 62, 64. Furthermore, the fixing piece 60 is provided with fixing holes 60A on the front side of the connecting pieces 62, 64, respectively, which are fastened to the vehicle body 31 side.

As shown in FIG. 2, a cross member 66 is disposed on the vehicle body side along the seat width direction, and the bracket 38 is fixed to the cross member 66 via a fixing piece 60. Although not shown, for example, a fixing member can be fixed to the cross member 66, and a bolt welded to the fixing member is inserted into the fixing hole 60A, and the bracket 38 and the cross member 66 are fastened (fixed) via a nut.

(Functions and Effects of Vehicle Seat)
Next, the operation and effects of the vehicle seat according to this embodiment will be described.

As shown in Figures 1 and 2, in this embodiment, the seat cushion frame 20 that constitutes the framework of the seat cushion 14 of the rear seat 12 is configured to include a pair of side frames 22, 24 and a center frame 26. The side frames 22, 24 extend along the front-rear direction of the seat at both ends of the seat cushion frame 20 in the seat width direction, and the center frame 26 extends along the front-rear direction of the seat at the center of the seat cushion frame 20 in the seat width direction.

The front ends 22A, 24A of the side frames 22, 24 are fixed to the vehicle body 31 via fixing parts 28, and the front end 26A of the center frame 26 is positioned forward of the front ends 22A, 24A of the side frames 22, 24 and fixed to the vehicle body 31 via fixing parts 32.

For example, if the seat back 16 of the rear seat 12 is divided 6:4 in the seat width direction and luggage is placed in the luggage compartment 11 of the vehicle 10, when the vehicle 10 suddenly decelerates (not shown), the luggage in the luggage compartment 11 collides with the back of the seat back 16 due to inertial force, and the seat back 16 bends in a roughly U-shape in a plan view with the divided part as the apex, and the impact load is transmitted from the seat back 16 to the seat cushion 14.

As a result, stress is concentrated in the center of the seat width direction on the seat cushion 14 side. Therefore, the load that the center frame 26 must support is greater than that of the side frames 22, 24. Therefore, by making the length of the center frame 26 longer than that of the side frames 22, 24, it is possible to reduce the stress per unit length of the center frame 26 compared to the side frames 22, 24.

As a result, in this embodiment, the strength of the center frame 26 can be improved, and as a result, the center frame 26 can be reinforced. In other words, in this embodiment, it is possible to reinforce the seat cushion frame 20 against input and prevent an increase in mass.

In this embodiment, the center frame 26 is configured to include a pair of extension members 34, 36 and a bracket 38. The extension members 34, 36 are arranged next to each other (left and right) in the seat width direction, and the extension members 34, 36 are integrated by the bracket 38.

In this way, by configuring the center frame 26 with two extension members 34, 36 arranged on the left and right, when an impact load is transmitted from the seat back 16 to the seat cushion 14, the load transmitted to the center frame 26 can be dispersed. As a result, it is possible to reduce the load resistance required for the extension members 34, 36.

In addition, in this embodiment, the extension members 34, 36 are integrated by the bracket 38. For example, as a comparative example, if the bracket 38 is not provided, the weight of the extension members 34, 36 may cause the positions of the front end portions 26A of the extension members 34, 36 to differ between the left and right in the up-down direction of the seat.

In contrast, in this embodiment, the extension members 34, 36 are integrated by the bracket 38, making it possible to suppress variation in the position of the front end 26A of the extension members 34, 36 in the up-down direction of the seat.

As shown in Figures 3 and 6, the bracket 38 is crank-shaped when viewed from the side of the seat, and is provided with support pieces 56, 58 extending along the front-rear direction of the seat, a fixed piece 60 extending along the width direction of the seat, and connecting pieces 62, 64 connecting the support pieces 56, 58 and the fixed piece 60.

The front end 42B of the extension portion 42 on the extension member 34 side is placed on the support piece 56, and the front end 42B of the extension portion 42 on the extension member 36 side is placed on the support piece 58. Therefore, in this embodiment, even if there is variation in the dimensions of the extension members 34, 36 in the seat fore-aft direction, adjustments can be made by the support pieces 56, 58, and precision can be ensured in the position of the fixing portion 32. In this way, by ensuring the positional precision of the fixing portion 32, it is possible to reliably and easily fix it to the vehicle body 31.

In this embodiment, the bracket 38 is crank-shaped when viewed from the side of the seat, and a fixing piece 60 is formed below the support pieces 56, 58 that support the front ends 42B of the extension parts 42 of the extension members 34, 36, in the vertical direction of the seat, where the fixing part 32 that fixes the extension members 34, 36 to the vehicle body 31 is provided.

In this way, by using the bracket 38 that is crank-shaped when viewed from the side of the seat, it is possible to absorb the height difference that occurs between the front end 42B of the extension portion 42 of the extension members 34, 36 and the fixed portion 32. Therefore, there is no need to change the shape of the extension members 34, 36 to match the position of the fixed portion 32, and the extension members 34, 36 can be fixed while remaining extended in the fore-and-aft direction of the seat. In other words, in this embodiment, the shape of the extension members 34, 36 can be simplified, which makes it possible to reduce costs accordingly.

In addition, in this embodiment, the fixing portion 32 of the center frame 26 is fixed to a cross member 66 arranged along the seat width direction on the vehicle body 31 side. The cross member 66 is a skeletal member on the vehicle body 31 side, and therefore has high rigidity and strength. Therefore, by fixing the center frame 26 to the cross member 66, it is possible to increase the load-bearing capacity of the seat cushion frame 20.

In this embodiment, the center frame 26 includes the extension members 34, 36, each of which further includes a first extension portion 40 and a second extension portion 42. The first extension portion 40 constitutes a part of the extension members 34, 36, and the rear end portion 40B of the first extension portion 40 is connected to the lower frame 46. Meanwhile, the second extension portion 42 constitutes at least another part of the extension members 34, 36, and the front end portion 42B of the second extension portion 42 is supported by support pieces 56, 58 provided on the bracket 38.

In this manner, in this embodiment, the extension members 34, 36 are each composed of a first extension portion 40 and a second extension portion 42 along the longitudinal direction, and therefore, although not shown, the rigidity can be increased compared to when the extension members 34, 36 are formed from a single member.

As described above, in this embodiment, the extension members 34, 36 are configured to include the first extension portion 40 and the second extension portion 42, but are not limited to this. For example, although not shown, they may include members other than the first extension portion 40 and the second extension portion 42.

The present invention can be modified in various ways without departing from the spirit of the invention. It goes without saying that the scope of the invention is not limited to the above embodiment.

10 vehicle 11 luggage compartment 12 rear seat (vehicle seat)
14 Seat cushion 16 Seat back 20 Seat cushion frame 22 Side frame 22A Front end portion (first front end portion)
24 Side frame 24A Front end portion (first front end portion)
26 Center frame 26A Front end portion (second front end portion)
28 Fixed part (first fixed part)
31 Vehicle body 32 Fixing part (second fixing part)
34 Extension member (center frame)
34A Front end (third front end)
36 Extension member (center frame)
36A Front end (third front end)
38 Bracket (center frame)
40 Extension part (first extension part)
40B Rear end portion 42 Extending portion (first extending portion)
42B front end portion 44 seat back frame 46 lower frame 56 support piece (bracket)
58 Support piece (bracket)
66 Cross member

Claims (5)

The seat cushion frame is disposed rearward of the front seat in the vehicle interior in the longitudinal direction of the vehicle and constitutes the framework of the seat cushion on which the occupant sits.
a pair of side frames extending along a seat front-rear direction at both ends in a seat width direction of the seat cushion frame, the first front end portions in the seat front-rear direction being fixed to a vehicle body side via first fixing portions;
a center frame that extends along a seat front-rear direction in a center portion of the seat cushion frame in a seat width direction, a second front end portion in the seat front-rear direction being disposed forward of the first front end portion in the seat front-rear direction and fixed to the vehicle body side via a second fixing portion;
Equipped with
The center frame is
A pair of extension members arranged adjacent to each other in the sheet width direction;
A bracket that integrates the pair of extension members;
A vehicle seat comprising: The vehicle seat according to claim 1, wherein the bracket includes a pair of support pieces that form the second front end and adjustably support the third front end of each of the pair of extension members in the seat front-rear direction along the seat front-rear direction. The vehicle seat according to claim 2, wherein the bracket is crank-shaped in a side view of the seat, and the second fixing portion is disposed lower in the seat vertical direction than the third front end portion. The vehicle seat according to claim 1, wherein the center frame is fixed via the second fixing portion to a cross member arranged along the seat width direction on the vehicle body side. The seat back frame is a frame of a seat back that constitutes a front end of a luggage compartment of the vehicle. The seat back frame is a frame of a seat back that constitutes a front end of the ...
The pair of extension members are
a pair of first extending portions each having a rear end portion in a seat front-rear direction coupled to the lower frame;
a pair of second extension portions, each having a rear end portion in a seat front-rear direction coupled to the first extension portion and a front end portion in a seat front-rear direction serving as the third front end portion;
The vehicle seat according to claim 2, further comprising: