JP2017030487A - Vehicle seat frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat frame having a light structure with a smaller number of components, the vehicle seat frame being able to ensure a space for the feet of an occupant in a rear seat and also restrict deformation when large load is applied thereto.SOLUTION: A cushion frame 20 comprises: a pair of side frames 21; a rear pipe 23 connecting the side frames 21; a pair of slide rails 50 disposed on a floor F; and a right bracket 41 connecting the rear pipe 23 and the slide rail 50. A rear pipe has an extension part 23Ra extending in the direction of the outside of a seat from a right side frame 21R. The right bracket comprises: two side walls 41a facing each other and extending forward and backward directions; a rear wall connecting the respective rear ends of the side walls 41a; and a lower wall 41c connecting the lower ends of the side walls 41a and the lower end of the rear wall. The extension part 23Ra is attached to the corresponding side wall 41a and the lower wall 41c is attached to the slide rails 50.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicle seat frame.

  In the vehicle seat, a slide rail is provided at a position offset from the outer side of the cushion frame toward the outer side of the vehicle in order to secure a wide space for the seat occupant of the rear seat in the outer side of the vehicle. There is something that is connected through. Specifically, the bracket has an L-shaped section cut by a plane perpendicular to the floor and extending in the seat width direction, the upper end of the L-shaped vertical side is attached to the outer side of the cushion frame, and the L-shaped lateral side The end opposite to the vertical side is attached to the slide rail. Here, in the technique of Patent Document 1, when a heavy load from a seated person caused by a rear collision of the vehicle acts on the bracket, the lateral side of the bracket bends and deforms in the vertical direction and the seat cushion frame sinks. In order to suppress, the stopper was provided between the slide rail and the side of the bracket. In addition, when a heavy load from a seated person due to a rear collision of the vehicle is applied to the bracket, the bracket side wall is prevented from moving in the left-right direction due to the vertical side of the bracket falling down in the left-right direction. The thickness was increased.

Japanese Patent Laying-Open No. 2015-3582

  In the technique described in Patent Document 1, a stopper is required to suppress the vertical deformation of the bracket, so that the number of parts increases and the wall thickness is increased to suppress the horizontal deformation of the bracket. As a result, there is a problem that the weight increases.

  In view of such problems, an object of the present invention is to provide a vehicle seat frame having a small number of parts and a light weight structure that can secure a footrest space for a seated person in a rear seat and suppress deformation when a large load is applied. There is.

  1st invention of this invention is a vehicle seat frame, Comprising: A pair of side frame which comprises the side part of a cushion frame, the connection member which connects between these side frames, It is arrange | positioned on the floor and it is arrange | positioned in the front-back direction. A pair of slide rails that extend, and a bracket that connects the connecting member and the slide rail, and the connecting member has an extending portion that extends from at least one of the side frames in the seat outer direction, The bracket includes at least one first wall surface extending in the vertical direction, a second wall surface extending in the left-right direction from a front end portion or a rear end portion of the first wall surface, a lower end portion of the first wall surface, and a lower end of the second wall surface. A third wall surface connecting the first wall surface, the extension portion is attached to the first wall surface of the bracket, and the third wall surface is attached to the slide rail. And wherein the Rukoto.

  According to the first aspect of the present invention, the extending portion that extends from the side frame of the cushion frame toward the seat outer side is supported by the bracket with respect to the slide rail. As a result, the slide rail is disposed at a position offset from the outer side portion of the cushion frame in the seat outer direction, so that a footrest space for a seat occupant in the rear seat is secured. Further, the structural strength of the bracket is enhanced by connecting the first wall surface and the third wall surface forming the L-shaped cross section with the second wall surface. That is, the extension part is attached to the first wall surface of the bracket, and the first wall surface is prevented from being deformed in the vertical direction and the left-right direction by the second wall surface and the third wall surface. As a result, it is possible to suppress deformation when a large load is applied with a lightweight structure in which the wall thickness is reduced with a small number of parts.

  According to a second aspect of the present invention, in the first aspect, the first wall surface is provided in a pair facing the seat in the left-right direction, and the second wall surface and the third wall surface are respectively provided on the first wall surface. Are connected, and the extension portion is attached.

  According to the second invention, the pair of first wall surfaces support the extending portion in a state in which the deformation in the vertical direction and the horizontal direction is suppressed by being integrated by the second wall surface and the third wall surface. This makes it possible to more efficiently suppress vertical and horizontal deformations.

  According to a third aspect of the present invention, in the first aspect or the second aspect, the second wall surface is provided with a weakening portion that allows deformation in the vertical direction.

  According to the third invention, it is possible to suppress deformation at the time of applying a heavy load and to absorb energy at the time of applying a heavy load with a lightweight structure in which the thickness is reduced with a small number of parts.

It is a perspective view which shows the seat frame for motor vehicles concerning one Embodiment of this invention. It is a side view of the seat frame for cars of the above-mentioned embodiment. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. It is the perspective view which looked at the bracket of the said embodiment from the front. It is the perspective view which looked at the bracket of the said embodiment from back.

  1 to 5 show an example in which the present invention is applied to an automobile seat frame, which is an embodiment of the present invention. In each figure, each direction of the automobile when the automobile seat frame is attached to the automobile is shown by arrows. In the following description, the description regarding the direction is made based on this direction. The vehicle seat frame 1 of the present embodiment includes a cushion frame 20 and a back frame 3. A headrest frame is attached to the upper part of the back frame 3, but is omitted. Since the back frame 3 and the headrest frame have a known configuration, a description thereof will be omitted, and the cushion frame 20 will be described. Here, the vehicle seat frame 1 corresponds to a “vehicle seat frame” in the claims.

  As shown in FIG. 1, the cushion frame 20 includes a main body portion 20 a on which a cushion pad is placed, a pair of slide rails 50 that are fixed to the floor F by extending in the front-rear direction, and the main body portion 20 a with respect to the slide rail 50. And a bracket 40 that supports the upper part spaced apart upward.

  The main body portion 20a has a pair of side frames 21 extending in the front-rear direction on the left and right side portions thereof. The right side frame 21R, which is the right side frame, and the left side frame 21L, which is the left side frame, are substantially bilaterally symmetric. Is a substantially U-shaped member having an opening. The right side frame 21R and the left side frame 21L are connected by a cylindrical front pipe 22 on the front side and connected by a cylindrical rear pipe 23 on the rear side. Furthermore, a front panel 24 is attached to the front side portions of the right side frame 21R and the left side frame 21L so as to span the bridge. As a result, the right side frame 21R and the left side frame 21L are connected in a state of facing each other with a predetermined distance therebetween, and constitute a substantially rectangular main body 20a as viewed from above. Here, the front pipe 22 and the rear pipe 23 correspond to “connecting members” in the claims.

  As shown in FIG. 3, a right reduced diameter portion 23R is provided at the right end portion of the rear pipe 23, and a left reduced diameter portion 23L is provided at the left end portion. Both the right reduced diameter portion 23R and the left reduced diameter portion 23L are reduced in diameter to about 4/5 of the initial pipe outer diameter by swaging. The right reduced diameter portion 23R is set to be about 5 times longer in the left-right direction than the left reduced diameter portion 23L. This is to deal with the fact that the arrangement position of the slide rail 50 is different on the left and right with respect to the side frame 21 of the main body 20a as will be described later. The right reduced diameter portion 23R is passed through a hole 21Ra having an inner diameter slightly larger than the outer diameter of the right reduced diameter portion 23R provided in the right side frame 21R, and is fixed by welding. Here, in the state fixed by welding, the portion on the right side (the seat outside) of the right side frame 21R of the right reduced diameter portion 23R is the extension portion 23Ra. The left reduced diameter portion 23L is passed through a hole 21La having an inner diameter slightly larger than the outer diameter of the left reduced diameter portion 23L provided in the left side frame 21L, and is fixed by welding. Here, in a fixed state by welding, a portion on the left side (outer side of the seat) of the left reduced diameter portion 23L from the left side frame 21L is short and serves as a protruding portion 23La for welding. The assembly structure of the front pipe 22, the right side frame 21R, and the left side frame 21L is substantially the same as the assembly structure of the rear pipe 23, the right side frame 21R, and the left side frame 21L.

  As shown in FIG. 1, between the front pipe 22 and the rear pipe 23, an S spring 27 that supports a center portion and a rear portion of a cushion pad (not shown) from below is attached in a spanning manner. The S spring 27 is a member in which a spring formed by bending a wire is partially integrated with resin. The S spring 27 is held so as to be rotatable relative to the front pipe 22 and the rear pipe 23 via a resin member. Accordingly, even if the S spring 27 is bent up and down due to the seating of the occupant, it slides smoothly in the rotational direction with respect to the front pipe 22 and the rear pipe 23, so that abnormal noise or the like is hardly generated.

  Reclining plates 21a are attached to the rear side portions of the right side frame 21R and the left side frame 21L with bolts and nuts, respectively. Left and right lower ends of the back frame 3 are attached to the reclining plate 21a via a recliner (not shown), and the angle of the back frame 3 with respect to the cushion frame 20 can be adjusted by operating the recliner. ing.

  As shown in FIGS. 1 and 3, the slide rail 50 includes a lower rail 51 that extends and fixed to the floor F in the front-rear direction, and an upper rail 52 that is slidably assembled to the lower rail 51. The right slide rail 50R, which is the right slide rail, and the left slide rail 50L, which is the left slide rail, are the same. The right slide rail 50R is disposed at a position offset in the right direction (the seat outer direction) below the right side frame 21R. Further, the left slide rail 50L is disposed at a position where the amount of offset in the left-right direction is small below the left side frame 21L, that is, at a position slightly offset in the right direction slightly below the left side frame 21L. The right slide rail 50R and the left slide rail 50L incorporate a lock mechanism (not shown), and a lever 53 for operating the lock mechanism is provided between the upper rail 52 of the right slide rail 50R and the front end portion of the upper rail 52 of the left slide rail 50L. Is provided. The slide rail 50 functions to adjust the position of the cushion frame 20 in the front-rear direction with respect to the floor F.

  As shown in FIG. 3, a right bracket 41 and a left bracket 42 are used as the bracket 40 that supports the main body 20 a with respect to the slide rail 50. As shown in FIGS. 4 and 5, the right bracket 41 includes a pair of side wall portions 41 a that extend oppositely in the front-rear direction and the oblique vertical direction, and a rear wall portion 41 b that connects the rear end portions of the side wall portions 41 a, The lower wall part 41c which connects the lower end parts of the side wall part 41a and the lower end part of the rear wall part 41b is provided. The side wall 41a is formed so as to incline backward as it goes upward, and a hole 41a1 having an inner diameter slightly larger than the outer diameter of the right reduced diameter portion 23R of the rear pipe 23 is provided in the vicinity of the upper end portion thereof. The rear wall portion 41b has an R shape that protrudes rearward from the joint portion with the rear end portion of the side wall portion 41a, and a notch 41b1 extending in the left-right direction at a slightly lower central portion in the vertical direction. Is provided. A bolt hole 41c1 for fixing to the upper rail 52 of the slide rail 50 is provided in the center of the lower wall portion 41c. The right bracket 41 is formed by press forming of a steel plate. Here, the side wall portion 41a, the rear wall portion 41b, and the lower wall portion 41c correspond to the “first wall surface”, “second wall surface”, and “third wall surface” in the claims, respectively. The notch 41b1 corresponds to a “weakening portion” in the claims.

  As shown in FIG. 3, the left bracket 42 is a bracket having a normal L-shaped cross section, but the L side is set shorter than the vertical side. In the vicinity of the upper end portion of the vertical side portion 42a of the left bracket 42, a hole 42a1 having an inner diameter slightly larger than the outer diameter of the left reduced diameter portion 23L of the rear pipe 23 is provided. Further, a bolt hole 42 b 1 for fixing to the upper rail 52 of the slide rail 50 is provided in the vicinity of the central portion in the left-right direction of the horizontal side portion 42 b of the left bracket 42. The right bracket 41 and the left bracket 42 are the same for the front pipe 22 and the rear pipe 23.

  As shown in FIG. 3, the extending portion 23Ra of the rear pipe 23 is passed through the holes 41a1 of the two side wall portions 41a of the right bracket 41 and fixed by welding, and the bolts are passed through the bolt holes 41c1 of the lower wall portion 41c. Thus, the upper rail 52 of the slide rail 50 is fastened and fixed. At this time, the right slide rail 50R is disposed at a position offset to the right side with respect to the right side frame 21R. Further, the left reduced diameter portion 23L of the rear pipe 23 is welded and fixed through the hole 42a1 of the vertical side portion 42a of the left bracket 42, and a bolt is passed through the bolt hole 42b1 of the horizontal side portion 42b to slide the slide rail 50. The upper rail 52 is fastened and fixed. In the assembly of the rear pipe 23, the left bracket 42 and the left side frame 21L, the left reduced diameter portion 23L of the rear pipe 23 is simultaneously inserted into the hole 42a1 of the vertical side portion 42a of the left bracket 42 and the hole 21La of the left side frame 21L. Insert and fix at the same time. At this time, since the horizontal side portion 42b of the left bracket 42 is shorter than the vertical side portion 42a, the left slide rail 50L is disposed at a position slightly offset to the right side with respect to the left side frame 21L.

  The embodiment configured as described above has the following operational effects. Below the right side frame 21R, the right slide rail 50R is disposed at a position offset in the right direction, that is, the outside direction of the automobile, so that a footrest space for a seat occupant in the rear seat is widely secured in the outside direction of the automobile. The Further, the extending portion 23Ra of the rear pipe 23 is attached to the two side wall portions 41a of the right bracket 41, and the two side wall portions 41a are prevented from being deformed in the vertical direction and the horizontal direction by the rear wall portion 41b and the lower wall portion 41c. It is fixed to the upper rail 52 in a state. As a result, it is possible to suppress deformation when a large load is applied with a lightweight structure in which the wall thickness is reduced with a small number of parts.

  Further, the rear wall 41b of the right bracket 41 is provided with a notch 41b1 extending in the left-right direction. As a result, when a large load in the vertical direction is applied, the right bracket 41 is deformed in the vertical direction with the notch 41b1 as a trigger, and energy can be absorbed.

  As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, the following can be mentioned.

1. In the above embodiment, a bracket provided with two side wall portions 41 a is employed as the right bracket 41. It can replace with this and can also be set as the bracket which lacks any one side wall part 41a. At this time, in FIG. 3, when the bracket having only the left side (seat inner side) side wall 41 a is used as the side wall, the extended portion of the rear pipe 23 is compared with the case where the right bracket 41 having two side walls 41 a is used. 23Ra can be shortened and the weight can be further reduced.

2. In the above embodiment, the central portion where the right reduced diameter portion 23R and the left reduced diameter portion 23L are provided on the rear pipe 23 and the S spring 27 is attached is a portion having a larger diameter than the right reduced diameter portion 23R and the left reduced diameter portion 23L. did. This is to increase the bending strength of the central portion to which the load from the S spring 27 is applied and to reduce the size of the bracket. Instead of this, if there is no particular problem in terms of strength and / or size, a pipe having the same diameter may be used as a whole without providing a reduced diameter portion.

3. In the above embodiment, a normal L-shaped cross-section bracket is used as the left bracket 42. Alternatively, the left reduced diameter portion 23L may be provided with an extending portion and the same bracket as the right bracket 41 may be used. In this case, the left slide rail 50L can also be offset in the seat outer direction with respect to the left side frame 21L to secure the footrest space for the seated person in the rear seat both in the outer direction and in the inner direction.

4). In the above embodiment, the rear wall 41b of the left bracket 42 is provided with a notch 41b1 for energy absorption. Alternatively, the weakened portion may be formed by shaping a groove shape extending in the left-right direction.

5. In the above embodiment, the side wall 41a of the right bracket 41 is formed so as to incline backward as it goes upward. Instead of this, it may be formed so as to extend upward without being inclined backward, or may be formed so as to be inclined forward as it goes upward.

6). In the above embodiment, the present invention is applied to an automobile seat frame. However, the present invention may be applied to a seat frame of a seat mounted on a ship, a train, or the like.

1 Car seat frame (vehicle seat frame)
20 Cushion frame 20a Main part 21 Side frame 21R Right side frame 21L Left side frame 22 Front pipe (connection member)
23 Rear pipe (connecting member)
23Ra extension 40 bracket 41 right bracket 41a side wall (first wall surface)
41b Rear wall (second wall surface)
41c Lower wall (third wall surface)
50 Slide rail 50R Right slide rail F Floor

Claims (3)

A vehicle seat frame,
A pair of side frames constituting the side portion of the cushion frame, a connecting member for connecting the side frames, a pair of slide rails disposed on the floor and extending in the front-rear direction, and between the connecting member and the slide rails A bracket to be coupled,
The connecting member has an extending portion extending from at least one of the side frames in the seat outer direction, and the bracket includes at least one first wall surface extending in the vertical direction, and a front end portion or a rear end of the first wall surface. A second wall surface extending in the left-right direction from the portion, and a third wall surface connecting the lower end portion of the first wall surface and the lower end portion of the second wall surface,
The vehicle seat frame in which the extension portion is attached to the first wall surface of the bracket and the third wall surface is attached to the slide rail.   In Claim 1, a pair of said 1st wall surface is provided facing the sheet | seat left-right direction, and said 2nd wall surface and said 3rd wall surface are connected to each of said 1st wall surface, and said extension Vehicle seat frame to which the part is installed. The vehicle seat frame according to claim 1 or 2, wherein the second wall surface is provided with a weakening portion that allows deformation in a vertical direction.

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