JP4236983B2 - Seat back of vehicle seat - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seat back of a vehicle seat.
[0002]
[Prior art]
In general, the framework of the seat back of a vehicle seat has an upper frame and a lower frame made of iron pipes or the like, as disclosed in JP-A-9-169232. The side frame is made of sheet metal or the like and is welded to the upper frame and the lower frame. A cushion pad is attached to the front side of the frame, and the side frame is covered with the cushion pad.
[0003]
[Patent Document 1]
JP-A-9-169232 [0004]
[Problems to be solved by the invention]
However, the metal frame is not only heavy, but there is a problem that the welding work during assembly is complicated. In order to solve the above problem, the present applicant configures the left and right side frames, the upper frame, and the lower frame by resin molded products and connects them by means such as heat caulking (welding prevention) or screwing. A seat back in which a framework is assembled has been developed and applied (Japanese Patent Application No. 2002-179888). The cushion pad is disposed between the left and right side frames of the seat back, and the outer surface of the side frame is provided as a cosmetic surface exposed to the outside. Since this side frame is a single resin molded product, it must be highly rigid by providing a complicated rib structure on the inner surface, and the outer surface must be a decorative surface that exhibits a good appearance. However, the rib structure on the inner side has a drawback of causing sink marks on the outer surface during molding.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, a seat back of a vehicle seat according to the present invention includes a pair of left and right side frames that extend vertically, an upper frame and a lower frame that are spanned between the side frames, and a front side of these frames. In the seat back of a vehicle seat provided with a cushion pad attached to the vehicle, the side frame fixes a hollow closed section by fixing the inner half body and the outer half body made of separate resin molded products to each other. The upper frame and the lower frame are connected to the inner half, and the outer surface of the outer half is exposed to the outside.
[0006]
According to the above configuration, since the side frames are made of resin, the weight can be reduced, and the side frames can be assembled relatively easily by connecting means such as heat caulking and screwing other than welding. Moreover, since the side frame fixes the inner half and the outer half to form a closed hollow cross section, high rigidity can be obtained. In addition, the upper frame and the lower frame are connected to the inner body, the outer frame covers the inner body, and the outer surface is exposed to the outside, and the two halves share their roles. It can be set as the structure which exhibits optimally.
[0007]
Preferably, one of the inner half and the outer half is formed with a pair of welding receiving portions extending in the vertical direction and spaced apart in the front-rear direction, and the other is formed in a pair of welding protrusions extending in the vertical direction and spaced apart in the front-rear direction. The welding protrusion is vibration welded to the welding receiving portion. Thereby, a side frame can be assembled comparatively easily.
[0008]
Preferably, the inner half of the side frame has a mounting rib projecting toward the center of the seat back, and the upper frame and the lower frame are made of a resin molded product and have mounting arm portions extending from both ends thereof. The arm portion hits the front surface or the rear surface of the mounting rib and is connected by screws from the front or the rear. As a result, the side frame, the upper frame, and the lower frame can be assembled relatively easily by screwing from the front and rear directions.
[0009]
Preferably, both end portions of the upper frame and the lower frame portion have first engaging portions made of convex portions or concave portions, and upper and lower end portions of the inner half of the side frame are made of convex portions or concave portions. The upper frame and the lower frame are connected to the inner half body by having a second engagement portion and fitting the first engagement portion and the second engagement portion together. Thereby, the side frame, the upper frame, and the lower frame can be reliably and easily assembled.
[0010]
The inner half of the side frame includes a plurality of hooking pin portions extending horizontally toward the seat back center, and the cushion pad includes a pad main body and an outer skin covering the front surface of the pad main body. A mounting portion extending rearward from the edge is hooked on the hooking pin. Thereby, connection with a cushion pad and a side frame can be performed by a simple operation | work.
[0011]
Preferably, a sheet metal-like mounting bracket is fixed to a lower end portion of the inner half of the side frame on a surface facing the outer half, and the inner half is coupled to the hinge mechanism via the mounting bracket. The According to this, the mounting bracket can be fixed to the inner body without interfering with the lower frame, and the connection structure of the lower frame to the side frame can be simplified.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the seat back 1 includes an upper frame 10, a lower frame 20, left and right side frames 30, a backboard 40, and a cushion pad 50 as main components.
[0013]
An inner half 31 and an outer half 37, which will be described later, of the upper frame 10, the lower frame 20, and the side frame 30 that form the framework of the seat back 1 are made of resin such as polypropylene (PPG) containing glass fiber that is separately molded. The back board 40 is also an injection-molded product made of resin such as polypropylene.
[0014]
As shown in FIGS. 1 and 5, the upper frame 10 has a main body portion 11 extending in the left-right direction and a pair of attachment arm portions 12 extending downward from both ends thereof, and is formed in a gate shape. Reinforcing ribs 13 are provided on the main body 11, and a sufficient strength is obtained while being a light-weight structure. A holding hole 14 is formed on the upper surface of the main body 11 to accommodate a head support stay support holder (not shown). Moreover, the convex part 15 (1st engaging part) which protrudes in the left-right direction is formed in the both ends of the main-body part 11. As shown in FIG. The mounting arm portion 12 has a plate shape and its rear surface is provided as a contact surface. Two holes 12a are formed in the mounting arm portion 12 so as to be separated from each other in the vertical direction. The mounting arm portion 12 and the convex portion 15 are elements for connecting to the inner half 31 of the side frame 30 as will be described later.
[0015]
As shown in FIGS. 1 and 5, the lower frame 20 includes a main body portion 21 extending in the left and right direction, a mounting arm portion 22 extending upward from both left and right end portions of the main body portion 21, and parallel to the main body portion 21. Is provided with two belt portions 23 connected to the mounting arm portion 22. The belt portion 23 has an elongated and thin plate shape, and serves as a substitute for an S-shaped spring of a general seat, and receives the load of the occupant. The main body 21 has a U-shaped longitudinal section and has reinforcing ribs 24, and has sufficient strength while being thin and lightweight. The rear surfaces of the left and right ends of the main body 21 are provided as contact surfaces, and holes 21a are formed in these ends. The mounting arm portion 22 has a plate shape, and its rear surface is provided as a contact surface. A hole 22 a is formed in the upper end portion of the mounting arm portion 22. On the rear surface of the lower end portion of the mounting arm portion 22, a convex portion 25 (first engaging portion) protruding in the left-right direction is formed. These holes 21a and 22a and the convex part 25 are elements for connecting with the inner half of the side frame 30 as will be described later.
[0016]
As shown in FIG. 5, the backboard 40 includes a plate-shaped main body portion 41 corresponding to the back surface shape of the seat back 1, and a flange portion 42 that extends forward from the left and right edges of the main body portion 41. Four ears 42 a that are separated in the vertical direction are formed on the front edge of the collar 42. Three clip attachment portions 43 are formed on the front surface of the main body portion 41 so as to be separated from each other vertically along the flange portions 42. These clip attachment portions 43 are slightly separated from the collar portion 42. Further, four clip mounting portions 44 that are separated from each other are formed near the upper edge of the front surface of the backboard 40, and insertion ribs 45 are formed near the lower edge. The ear part 42a, the clip attachment parts 43 and 44, and the insertion rib 45 are elements for connecting to the inner half 31 of the side frame 30, the upper frame 10 and the lower frame 20 as will be described later.
[0017]
As best shown in FIG. 4, the cushion pad 50 is composed of a pad main body 51 and a skin 51 attached to the front surface thereof. The skin 51 has a mounting portion 52a extending rearward from the left and right side edges, a mounting portion 52b extending rearward from the upper edge, and a mounting portion 52c extending rearward from the lower edge. A hole 52x is formed at the end of the attachment portion 52a. These attachment portions 52a, 52b, and 52c are elements for connecting to the inner half 31 of the side frame 30, the upper frame 10, and the lower frame 20 as described later.
[0018]
As shown in FIG. 6, the seat back 1 has a sheet metal mounting bracket 60 at the lower end thereof, and is attached to the hinge mechanism 2 via the mounting bracket 60. The mounting bracket 60 has a plurality of heat caulking holes 60 a, and the lower end portion serves as a mounting portion 61 for the hinge mechanism 2.
[0019]
As best shown in FIG. 6, the left and right side frames 30 are composed of two injection molded products, that is, an inner half 31 and an outer half 37.
As shown in FIGS. 6 to 8, the inner half body 31 has a substantially U-shaped cross section with the outer side open, and a vibration welding flange 32 (welding receptacle) extending vertically on the front and rear edges thereof. Part) is formed. On the other hand, the outer half body 37 has an arc shape or a U-shape projecting outward, and two welding protrusions 38 extending vertically are formed on the inner surface of the outer half body 37 so as to be separated in the front-rear direction. As shown in FIGS. 7A to 7E and FIG. 8, vibration welding is performed while the two welding protrusions 38 of the outer half 37 are brought into contact with the flange 32 of the inner half 31. By fixing the halves 31 and 37, a hollow side frame 30 having a closed cross section having an internal space 30x is formed. The outer surface of the outer half 37 is a decorative surface 37x exposed to the outside. The outer half 37 has a shoulder 39 of the seat back 1 with its upper end curved inward.
[0020]
A plurality of heat caulking convex portions 33 projecting outward (in the direction of the outer half 37) are formed on the surface of the inner half 31 facing the outer half 37 at the lower end. As shown in FIGS. 7D, 7E, and 8, the heat caulking convex portion 33 of the inner half 31 is fitted into the mounting bracket 60 that has been previously attached to the hinge mechanism 2, and the tip thereof is melted. The mounting bracket 60 is fixed to the inner half 31 by heat staking. In this fixed state, the mounting portion 61 of the mounting bracket 60 is positioned below the lower end of the inner half body 31, and the hinge mechanism 2 and the inner half body 31 do not interfere with each other. The lower end portion of the outer half body 37 extends downward from the lower end of the inner half body 31 and covers most of the hinge mechanism 2. As shown in FIG. 6, a hole 37 a for projecting the reclining operation portion is formed at the lower end portion of one outer half body 37.
[0021]
A hole 31a (concave portion, second engaging portion) is formed in the upper end portion of the inner half body 31, and a concave portion 31b (second engaging portion) is also formed in the lower end portion. A plate-shaped attachment rib 34 that extends vertically and protrudes toward the seat back center is formed on the surface facing the seat back center of the inner half 31 (the surface opposite to the outer half 37). The front surface of the mounting rib 34 is provided as a contact surface. The mounting rib 34 is formed with three notches 34a separated from each other in the vertical direction. As shown in FIG. 7F only, another mounting rib 34 ′ having the same notch is also formed at the lower end of the inner half 31.
[0022]
The upper frame 10 is fixed to the inner half 31 of the side frame 30 as follows. As shown in FIG. 7A, the holes 31a formed at the upper ends of the pair of inner halves 31 are fitted into the convex portions 15 at both ends of the upper frame 10, and fixed with screws 81 (shown only in FIG. 1). To do. Further, as shown in FIGS. 7B and 7C, the rear surface of the attachment arm portion 12 of the upper frame 10 is brought into contact with the front surface of the attachment rib 34 of the inner half 31. An aluminum metal fitting 82 is attached to the notch 34a of the attachment rib 34 in advance. The tapping screw 83 (shown only in FIG. 1) is inserted into the hole 12a of the mounting arm portion 12 from the front and screwed into the receiving bracket 82, thereby connecting the mounting arm 12 of the upper frame 10 to the inner half body 32. In this connected state, both ends of the main body 11 of the upper frame 10 are covered with shoulders 39 of the outer half 37.
[0023]
The lower frame 20 is fixed to the inner half 31 of the side frame 30 as follows. As shown in FIG. 7E, the concave portions 31 b formed at the lower ends of the pair of inner halves 31 are fitted into the convex portions 25 at both ends of the lower frame 20. Further, as shown in FIGS. 7D and 7F, the rear surface of the mounting arm portion 22 of the lower frame 20 and the rear surface of the main body portion 21 are brought into contact with the front surfaces of the mounting ribs 34 and 34 ′ of the inner half 31. In this state, the tapping screws 88 and 89 (shown in FIGS. 1 and 8) are inserted into the holes 22a and 21a of the lower frame 20 from the front and attached to the notches 34a of the mounting ribs 34 and 34 ′. The lower frame 20 is fixed to the inner half 31 by being screwed into 86 and 87.
[0024]
Four hooking pin portions 36 are formed on the surface of the inner half 31 on the seat back center side so as to protrude horizontally toward the center of the seat back. The cushion pad 50 with the skin 31 attached to the front surface is mounted on the front side of the frame composed of the pair of inner halves 31, the upper frame 10, and the lower frame 20, and is disposed between the pair of inner halves 31. The attachment portion 52a of the skin 52 of the cushion pad 50 is hooked on the hooking pin portion 36 of the inner half 31 through the hole 52x. The upper mounting portion 52 b of the skin 52 is tacked to the rear surface of the upper frame 10, and the lower mounting portion 52 c is tacked to the rear surface of the lower frame 20.
[0025]
The inner half 31 further has a mounting edge 35 that protrudes from the rear edge of the rear flange 32 toward the seat back center. The mounting edge 35 is formed with a slit 35a extending vertically. Further, three edge portions projecting inwardly are formed on the end edge of the attachment edge portion 35 so as to be separated from each other vertically, and holes 35b are formed in these ear portions.
[0026]
An arrowhead-shaped clip 90 is attached to the mounting convex portions 43 and 44 of the backboard 40 in advance. After the insertion rib 45 at the lower end of the backboard 40 is inserted into an engagement recess (not shown) formed on the rear surface of the main body 21 of the lower frame 20, the backboard 40 is attached to the frames 10, 20, 30. Press against the skeleton. Thus, as shown in FIGS. 7B, 7D, and 8, the ear portion 42a is inserted into the slit 35a of the inner half 31 and the clip 90 is inserted into the hole 35b and the upper frame of the inner half 31. 10 is inserted into a hole (not shown) formed in the rear surface, and as a result, the backboard 40 is fixed to the frame.
[0027]
Next, the assembly process of the seat back 1 will be briefly described. With the hinge mechanism 2 attached to the pair of left and right mounting brackets 60 in advance, the lower end of the inner half 31 is fixed. Next, the outer half 37 is fixed to the inner half 31. Next, the upper frame 10 and the lower frame 20 are connected to the left and right side frames 30 to construct a framework, and the hinge shaft 100 is attached to the hinge mechanism 2. Next, the cushion pad 50 is mounted from the front side of the frame. Next, the back board 40 is attached from the rear side of the frame. Finally, the reclining operation unit is attached.
[0028]
In the seat back 1 having the above configuration, the side frame 1 has a hollow closed cross-sectional shape by the inner half body 31 and the outer half body 37, and thus has high rigidity while being lightweight. As shown in FIG. 6, the inner half body 31 has a more complicated cross-sectional shape than the outer half body 37 and has high rigidity, but is reinforced by the outer half body 37. In this respect, the weight can be reduced. The outer half 32 does not play a role of connection with the other frames 10 and 20 and may have a relatively low rigidity. Therefore, the outer half 32 does not adopt a cross-sectional shape that causes sink marks on the decorative surface 37x. It will end.
[0029]
The present invention is not limited to the above embodiment, and can be modified as appropriate. For example, although the upper frame and the lower frame are configured by separate resin molded products, they may be configured by one resin molded product. In this case, the attachment arms of the upper frame and the lower frame are connected. The upper frame and the lower frame may be made of a light metal such as aluminum. The shapes of the left and right side frames may be different. The mounting bracket may be incorporated into the inner half during molding of the inner half.
[0030]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a seat back that is lightweight, highly rigid, and has a good appearance.
[Brief description of the drawings]
FIG. 1 is a front view showing a seat back of a vehicle seat according to an embodiment of the present invention without a cushion pad.
FIG. 2 is a rear view of the seat back.
FIG. 3 is a side view of the seat back.
FIG. 4 is a perspective view of the cushion pad of the seat back.
FIG. 5 is an exploded perspective view of a back panel, an upper frame, and a lower frame of the seat back.
FIG. 6 is an exploded perspective view of left and right side frames of the seat back.
7 (A) to (F) are cross-sectional views taken along lines AA, BB, CC, DD, EE, and FF in FIG. It is.
FIG. 8 is an enlarged cross-sectional view of a main part of FIG.
[Explanation of symbols]
10 Upper frame 15 Convex part (first engaging part)
20 Lower frame 25 Convex part (first engaging part)
30 side frame 31 inner half body 32 collar part (welding receiving part)
36 Hook Pin 37 Outer Half 37x Makeup Surface (Exposed Surface)
38 welding protrusion 40 back board 50 cushion pad 51 pad main body 52 skin 52a-52c attachment part 60 attachment bracket 81, 83, 88, 89 screw

Claims (8)

A vehicle having a pair of left and right side frames extending vertically, an upper frame and a lower frame that are made of members different from these side frames and spanned between the side frames, and a cushion pad mounted on the front side of these frames In the seat back of the seat,
The side frame is configured to have a hollow closed cross section by fixing the inner half and the outer half made of separate resin molded products to each other,
Of the inner half and the outer half, the upper frame and the lower frame are connected to only the inner half, and the outer surface of the outer half serves as an exposed surface to the outside. Seat back. The front edge of the outer half of the pair of side frames protrudes forward from the front edge of the inner half and is bent inward, and a cushion pad is disposed between the front edges of the outer half The seat back of the vehicle seat according to claim 1. One of the inner half and the outer half is formed with a pair of welding receiving portions that extend in the vertical direction and are spaced apart in the front-rear direction, and the other is formed in a pair of welding protrusions that extend in the vertical direction and are spaced apart in the front-rear direction. The welding protrusion is vibration welded to the welding receiving portion, and the front welding receiving portion or the welding protrusion on the inner half is formed on the front edge of the inner half, and the front side in the outer half The seat back of a vehicle seat according to claim 2, wherein the welding receiving portion or the welding protrusion is formed at a position retracted from the front edge of the outer half body . The upper ends of the outer halves of the pair of side frames are curved inward to form a seat back shoulder, and the shoulders cover the upper end of the inner halves and both ends of the upper frame. The seat back of the vehicle seat according to any one of claims 1 to 3. The inner half of the side frame has a mounting rib that protrudes toward the center of the seat back, the upper frame and the lower frame are made of a resin molded product, and the pair of mounting arms that extend downward from both ends of the upper frame The lower frame has a pair of mounting arm portions extending upward from both ends thereof, and these mounting arm portions hit the front or rear surface of the mounting rib of the inner half body and are connected by screws from the front or rear. The seat back of the vehicle seat according to any one of claims 1 to 4, wherein the seat back is provided. Both end portions of the upper frame and the lower frame portion have first engaging portions made of convex portions or concave portions, and second engagement members made of convex portions or concave portions are formed on the upper and lower end portions of the inner half of the side frame. has a coupling portion, by a second engagement portion thereof first engaging portion is fitted, according to claim 5 in which the upper frame and the lower frame, characterized in that it is connected to the inner half The seat back of the vehicle seat. The inner half of the side frame includes a plurality of hooking pin portions extending horizontally toward the seat back center, and the cushion pad includes a pad main body and an outer skin covering the front surface of the pad main body. The seat back of a vehicle seat according to any one of claims 1 to 6 , wherein an attachment portion extending from the edge to the rear of the pad main body is hooked on the hook pin. At the lower end of the inner half of the side frame, a sheet metal mounting bracket is fixed to the surface facing the outer half, and the inner half is connected to the hinge mechanism via the mounting bracket. The seat back of the vehicle seat according to any one of claims 1 to 7 .

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