JP6004185B2 - Vehicle seat structure - Google Patents

Description

  The present invention relates to a vehicle seat structure, and more particularly to a vehicle seat structure having a seat cushion, a seat back, and a headrest.

  In recent years, there has been a demand for further weight reduction of vehicles due to needs for improved fuel consumption and handling stability, and also weight reduction of seats. Here, the seat cushion frame and seat back frame made of metal are usually provided as the skeleton of the parts such as the seat cushion and seat back that make up the seat. In order to reduce the weight of these parts, weigh as much as possible. Various ideas have been made to construct these frames with various materials and to reduce the thickness of the frames themselves.

  On the other hand, as a requirement required for a vehicle seat, in addition to ensuring a passenger's posture maintaining function and comfort as the performance of the seat itself, it is required to ensure the safety of the passenger in the event of a vehicle collision. For example, in the event of a frontal collision of a vehicle, a load transmitted from the occupant to the seat at the time of a collision in order to properly restrain the occupant to the seat in cooperation with an occupant restraint device such as a seat belt or airbag, and to ensure the safety of the occupant Therefore, it is necessary to prevent the sheet itself from being deformed.

  Here, in Patent Document 1, the thickness of the seat cushion side frame is partially changed with respect to the load transmitted from the seat back frame to the seat cushion side frame via the reclining device at the time of rear collision, Thus, a technique for intentionally plastically deforming a predetermined portion to absorb a shock at the time of a rear collision and ensuring the safety of an occupant without increasing the weight is disclosed.

JP 2006-175976 A

  However, in the technique disclosed in Patent Document 1, the portion of the frame itself with a reduced thickness is a part, and there is room for further weight reduction, but it does not consider the load applied to the seat at the time of the front collision, There is a problem that it is necessary to ensure the safety of passengers.

  In addition, one of the viewpoints to be considered regarding passenger restraint by a seat belt at the time of a front collision is prevention of a so-called submarine phenomenon. This submarine phenomenon receives the inertial force that the occupant's body moves forward with respect to the seat at the time of a front collision, and the occupant slips between the seat belt and the seat cushion and slides forward from the seat surface of the seat. A phenomenon. In order to suppress such a submarine phenomenon, it is necessary to suppress that the front part of the seating surface of a seat cushion is displaced below at the time of a front collision. However, in order to meet the recent demand for weight reduction of seats, if the plate thickness of the entire seat cushion frame is reduced while maintaining the conventional seat structure, the downward displacement of the front portion of the seat cushion seating surface can be sufficiently suppressed. Therefore, there is a concern that the submarine phenomenon cannot be suppressed.

  The present invention has been made in order to solve the above-described problems of the prior art, and provides a vehicle seat structure capable of suppressing the submarine phenomenon while allowing the thickness of the entire seat cushion frame to be reduced. The purpose is to do.

To achieve the above object, the present invention is a seat cushion, a seat structure for a vehicle having a seat back and head rest, respectively Rutotomoni its upper and lower surfaces are formed of a plate material having a predetermined thickness flange The seat cushion frame provided in the seat cushion and the front portion of the seat cushion frame to support the load of the seated occupant, and the flange surface is formed on the upper surface of the side portion. A seat pan that is fixed to the seat cushion frame by fixing the upper surface of the seat cushion frame and the flange surface on the upper surface of the seat cushion frame, and a fixing member for fixing the seat cushion frame to the vehicle floor And attaching this fixing member to the seat cushion frame A first rib extending in the vertical direction is formed above the mounting portion, and the seat pan provided in the front portion of the seat cushion frame is at least a portion where the first rib is formed. at least one of the plurality of locations and is fixed to the seat cushion frame in the upper part but is secured to the seat cushion frame at a point located in the seat cushion frame, the portion where the first rib is not formed, a part The seat cushion frame is formed with a fixing portion for fixing the seat component, and the seat cushion frame includes a flange surface on the upper surface and / or a flange surface on the lower surface of the seat cushion frame and above the fixing portion and / or or downward, and wherein the second rib extending in the longitudinal direction of the seat cushion frame is formed To have.
In the present invention configured as described above, the seat cushion frame is formed with an attachment portion for attaching a fixing member for fixing the seat cushion frame to the floor of the vehicle, and above the position of the attachment portion. The first rib extending in the vertical direction is formed, and the seat pan is attached to the seat cushion frame at the upper part of at least the portion where the first rib is formed. The first rib exerts proof strength against the load in the substantially vertical direction, and the vertical deformation of the seat cushion frame is suppressed, whereby the front of the seat cushion including the seat pan is controlled. It is possible to suppress the portion from being displaced downward. Therefore, the submarine phenomenon can be suppressed while the thickness of the entire seat cushion frame can be reduced.
Furthermore, in the present invention, since the fixing portion of the seat component is formed by cutting out the seat cushion frame, the weight can be reduced by the amount of the cutout, and such a cutout is formed. The second rib can compensate for the reduced rigidity of the seat cushion frame.

  According to the present invention, the submarine phenomenon can be suppressed while reducing the thickness of the entire seat cushion frame to reduce the weight.

It is the perspective view which looked at the external appearance structure of the vehicle seat structure by embodiment of this invention from diagonally left front and upper direction. It is the perspective view which looked at the vehicle seat structure by embodiment of this invention from diagonally left front and upper direction. It is the side view which looked at the vehicle seat structure by the embodiment of the present invention from the left side. It is the elements on larger scale which looked at the peripheral structure of the seat cushion frame of the vehicle seat structure by the embodiment of the present invention from diagonally left rear. It is the partial expanded side view which looked at the periphery structure of the seat cushion frame of the vehicle seat structure by embodiment of this invention from the left side. It is a figure shown like FIG. 5 for demonstrating the load transmission path | route at the time of a front collision.

Next, a vehicle seat structure according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, the overall configuration of a vehicle seat structure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of an external configuration of a vehicle seat structure according to an embodiment of the present invention as viewed obliquely from the left front and above, and FIG. 2 illustrates the vehicle seat structure according to an embodiment of the present invention as a diagonally left front and It is the perspective view seen from the upper part, and FIG. 3 is the side view which looked at the vehicle seat structure by embodiment of this invention from the side.

First, as shown in FIG. 1, the vehicle seat 1 according to the present embodiment includes a seat cushion 2, a seat back 4, and a headrest 6. In the present embodiment, the seat 1 is provided in the vehicle front-rear direction so that the width direction thereof coincides with the vehicle width direction.
Trim members 8 that cover the lower part of the seat are provided on both the left and right sides of the seat cushion 2, and on the left side of the seat, the occupants are manually operated to move the seat cushion 2 up and down. A lift lever 10 and a reclining lever 12 and a lumbar support lever 13 for reclining the seat back 4 are provided.

  Next, as shown in FIGS. 1 to 3, the vehicle body floors (not shown) on the left and right sides of the seat 1 extend in the vehicle front-rear direction, and the seat cushion 2 slides in the seat front-rear direction (vehicle front-rear direction). A slide mechanism 14 is provided to support it freely. These slide mechanisms 14 are mainly composed of guide rails 16 fixed to the floor and sliders 18 slidably engaged with these guide rails 16. The slide mechanism 14 is provided with a connection bracket 20 and the like.

  Next, as shown in FIGS. 2 and 3, the seat 1 is provided in the seat cushion 2, and a pair of left and right seat cushion frames 24 for supporting the seat cushion 2 itself and the seats of these seat cushion frames 24. A seat pan 26 fixed to the front portion, a seat back frame 28 provided in the seat back for supporting the seat back 4 itself, a suspension mat 30, a supporting spring member 32, and the headrest 6 are attached. And a headrest frame 36 configured to support the headrest 6 and adjust the vertical position of the headrest 6.

Further, the seat 1 according to the present embodiment is provided with a lift mechanism 38 for connecting the slider 18 of the slide mechanism 14 and the seat cushion frame 24 and supporting the seat 1 and moving the seat cushion 2 up and down. Yes. As shown in FIGS. 2 and 3, the lift mechanism 38 includes a pair of left and right front link members 40 provided in the front portion of the seat, and a rear side link mechanism 42.
The front link member 40 has a lower end portion rotatably connected to the connection bracket 20, and an upper end portion rotatably connected to the seat cushion frame 24. The connection bracket 20 is fixed to the slider 18.

The rear side link mechanism 42 includes a pair of left and right rear link members 44 and a connection bracket 46 that are provided in the rear portion of the seat.
In the present embodiment, the front link member 40 and the rear link member 44 function as members for fixing the seat cushion frame 24 to the vehicle floor via the connection bracket 20, the bracket 46, and the slide mechanism 14. In the present embodiment, the seat cushion frame 24 is configured such that the seat cushion 2 can be moved up and down as the link members 40 and 44 rotate.
In addition, this embodiment is applicable also to the sheet | seat by which the height position of a seat cushion is fixed to a fixed position as a modification.

Next, the structure of the seat pan 26, the seat cushion frame 24, and the link member 40 will be described with reference to FIGS.
FIG. 4 is a partially enlarged perspective view of the peripheral structure of the seat cushion frame of the vehicle seat structure according to the embodiment of the present invention viewed obliquely from the left rear, and FIG. 5 is the vehicle seat structure according to the embodiment of the present invention. It is the partial expanded side view which looked at the periphery structure of a seat cushion frame from the left side. In the following, the configuration on the left side of the seat as shown in FIGS. 4 and 5 will be mainly described, but the configuration on the right side of the seat is also the same, and thus the description thereof is omitted here.

  First, as shown in FIG. 3, the seat pan 26 is provided at the front portion of the seat cushion 2 so as to mainly support the load on the thigh of the occupant. The seat pan 26 has a bottom surface 26a and is formed in a concave shape so as to surround the bottom surface 26a with three wall portions 26b so as to accommodate a part of a cushion member (not shown). From the left and right wall portions 26b, flange portions 26c extending to the upper portion of the seat cushion frame 24 are formed. These flange portions 26 c are attached to the upper portion of the seat cushion frame 24 by two rivets at the left and right, respectively, so that the seat pan 26 is fixed to the seat cushion frame 24. A passenger's load applied to the seat pan 26 is transmitted to the seat cushion frame 24 mainly via the flange portion 26c and the rivet 50. Here, as shown in FIGS. 4 and 5, the flange portion 26 c of the seat pan 26 extends from the front end portion thereof to a range that covers an upper portion of the seat cushion frame 24 where a first rib 54 described later is formed, The seat cushion frame 24 is fixed. The seat pan 26 may be fixed to the seat cushion frame 24 by welding or the like.

  Next, as shown in FIGS. 3 and 4, the seat cushion frame 24 is formed with an attachment portion 53 in which a hole (not shown) for attaching the rotation shaft 52 of the front link member 40 described above is formed. Has been. The rotating shaft 52 and the front link 40 are configured to have strength and rigidity so as to support the load of the front portion of the seat cushion 2 at the time of the front collision. Similarly, the seat pan 26 is configured to have strength and rigidity to support the load of the front portion of the seat cushion 2 at the time of the front collision.

  Next, the seat cushion frame 24 is formed by integrally molding a plate-like member having a predetermined plate thickness (for example, 1.2 mm). As shown in FIGS. 4 and 5, the seat cushion frame 24 has a vertical rib extending in the vertical direction so as to connect the mounting portion 53 described above and the rear rivet 50 among the rivets 50 described above. A (first rib) 54 is formed. The vertical ribs 54 are formed so that the side portions of the seat cushion frame 24 are partially raised outward in the seat width direction so as to exert a proof strength against the load transmitted from the seat pan 26 at the time of a front collision. And its rigidity is partially enhanced.

  Further, the seat cushion frame 24 is formed with a longitudinal rib (second rib) 56 extending in the longitudinal direction of the seat cushion frame 24 at the upper edge portion so as to increase the rigidity of the seat cushion frame 24 as a whole. Similarly, longitudinal ribs (second ribs) 58 extending in the longitudinal direction are also formed on the lower edge portion. Such longitudinal ribs 56 and 58 may be formed on either the upper edge or the lower edge as long as the seat cushion frame 24 can maintain a predetermined rigidity.

  The seat cushion frame 24 is formed with notches (fixed portions) 60 and 62 for hooks for attaching a seat skin, a net, the above-described trim member 8 and the like, which are seat components. These hook cutouts 60 and 62 are formed by cutting out part of the side surface of the seat cushion frame 24. Since these notches 60 and 62 also function as a fixing portion for the seat component parts, it is not necessary to provide a separate fixing portion, and since they are notched themselves, the number of parts can be reduced. This contributes to weight reduction of the entire seat.

Next, the load transmission path at the time of the front collision in the seat structure configured as described above will be described with reference to FIG. FIG. 6 is a view similar to FIG. 5 for explaining the load transmission path at the time of the front collision.
First, at the time of a front collision, particularly in the late stage of the collision, the thigh of the occupant mainly acts on the front part of the seat, and the load is transmitted mainly to the rear end part of the seat pan 26. The load transmitted to the seat pan 26 is transmitted to the seat cushion frame 24 via the flange portion 26c of the seat pan 26 described above, and the load in the direction indicated by F in FIG. Join. This load F is supported by the front link member 40. Thus, the seat cushion frame 24 becomes a part of the load transmission path from the seat front portion to the front link member 40. More specifically, the load F applied to the seat cushion frame 24 is a part of the upper edge portion of the upper seat cushion frame 24 when viewed from the attachment portion 53 in a side view (in the present embodiment, the rear rivet is mainly used). 50 portion) is transmitted in a direction toward the attachment portion 53.

Next, the effect of the sheet structure according to the embodiment of the present invention will be described.
In the present embodiment, the seat cushion frame 24 is formed with an attachment portion 53 for attaching the front link member 40 for fixing the seat cushion frame 24 to the vehicle floor, and above the position of the attachment portion 53. Since the vertical rib 54 extending in the vertical direction is formed, and the seat pan 26 is fixed to the seat cushion frame 24 at least in the upper part of the portion where the first rib 54 is formed, the seat pan 26 is at the time of a front collision. Thus, the passenger's load is effectively transmitted to the seat cushion frame 24, and the vertical ribs 54 exhibit proof strength against the substantially vertical load, thereby suppressing the vertical deformation of the seat cushion frame 24. The front portion of the seat cushion 2 including the seat pan 26 is prevented from being displaced downward. Can. Therefore, the submarine phenomenon can be suppressed while the thickness of the entire seat cushion frame 24 can be reduced (for example, the thickness can be changed from 1.4 mm to 1.2 mm).

  Further, in the present embodiment, since the hook cutout 60 which is a fixing portion of the seat component is formed by cutting out the seat cushion frame, the weight can be reduced by the cutout. In addition, the longitudinal ribs 56 and 58 can compensate for the decrease in rigidity of the seat cushion frame 24 as much as the cutout 60 is formed.

DESCRIPTION OF SYMBOLS 1 Seat 2 Seat cushion 16 Guide rail 18 Slider 20 Connection bracket 24 Seat cushion frame 26 Seat pan 26c Seat pan fixing flange 40 Front link member (fixing member)
50 Rivet 52 Rotating shaft 53 of the front link member Rotating shaft mounting portion 54 Vertical rib (first rib)
56 Longitudinal rib on the upper edge side (second rib)
58 Longitudinal rib on the lower edge (second rib)
60 Notch for hook (fixed part)

Claims (1)

A vehicle seat structure including a seat cushion, a seat back, and a headrest,
Predetermined plate is formed of a plate material having a thickness Rutotomoni each flange surface on its upper and lower surfaces are formed, and the seat cushion frame provided in the seat cushion,
Provided in the front part of the seat cushion frame to support the load of the seated occupant , a flange surface is formed on the upper surface of the side part, and this flange surface and the flange surface on the upper surface of the seat cushion frame are fixed at multiple places by being a seat pan that is adapted to be fixed to the seat cushion frame,
A fixing member for fixing the seat cushion frame to the floor of the vehicle, and the seat cushion frame is formed with an attachment portion for attaching the fixing member and above and below the attachment portion. A first rib extending to
The seat pan provided in the front portion of the seat cushion frame is at least an upper portion of the portion where the first rib is formed and at a position where at least one of a plurality of locations fixed to the seat cushion frame is located. It is fixed to the cushion frame,
The seat cushion frame is formed with a fixing portion for fixing a seat component formed by cutting out a part of the first rib in a portion where the first rib is not formed.
The seat cushion frame has second ribs extending in the longitudinal direction of the seat cushion frame in the vicinity of the upper flange surface and / or the lower flange surface of the seat cushion frame and above and / or below the fixing portion. A vehicle seat structure characterized by being formed .

Images