JP2017030497A - Vehicle seat frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle seat frame in which a cushion frame main body part and slide rails are connected via long brackets extending from the front part to the rear part of the cushion frame main body part, the vehicle seat frame having a lightweight structure that restricts deformation of the slide rails when large load is applied from a seat belt.SOLUTION: A vehicle seat frame comprises: a main body part 10 for a cushion frame 1; a pair of slide rails 20; a pair of brackets 40 attached to an upper rail 22, extending from the front part to the rear part of the cushion frame 1, and connecting the main body part 10; and a belt anchor bracket 50. The belt anchor bracket 50 is attached to the brackets 40, and the lower end of the belt anchor bracket is provided with a hook part 52, which is normally separated from a hook member 60 attached to a lower rail 21 and restricts deformation of the slide rails 20 by engaging with the hook member when large load is applied.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle seat frame.

  By attaching a bracket extending in the front-rear direction with a L-shaped cross section to a pair of slide rails extending in the front-rear direction on the floor and fixed to the vehicle seat frame, and connecting the cushion frame main body to the bracket Some are attached to the vehicle body. Specifically, the lower rail is fixed to the floor of the slide rail, the upper rail is slidably engaged with the lower rail, and the bracket is attached to the upper rail. In the vehicle seat frame described in Patent Document 1, a pair of front and rear links of the cushion frame main body are connected to the bracket, and a seat belt anchor is attached to the bracket. As a result, the cushion frame main body can move up and down and back and forth with respect to the floor, and the bracket receives and slides through the seat belt anchor when a large load is applied to the seat belt in the event of a collision. It works to convey to the upper rail of the rail. The structure in which the front and rear links are attached to the upper rail with one bracket is often employed when it is necessary to attach a weight detection mechanism. In addition, the vehicle seat frame described in Patent Document 2 has a hook attached to a bracket and engaged with a hook member attached to the lower rail when a large load is applied in order to transmit a large load from the seat belt to the lower rail of the slide rail. It has a structure.

JP2013-226932A JP 2004-42696 A

  In the technique described in Patent Document 1, when a large load is applied to the bracket, when the slide function of the slide rail is secured by reducing the deformation of the bracket and the slide rail, the bracket and the slide rail are thickened. It was necessary to take measures such as strengthening. In addition, when the technique described in Patent Document 2 is applied to the technique described in Patent Document 1, a large load is transmitted to the lower rail through the belt anchor, bracket, and hook. It was necessary to secure the coupling strength of the hook. As a result, there is a problem that the weight increases. In particular, since the bracket is a long member, the influence on the increase in weight due to the thickening is remarkable.

  In view of such a problem, an object of the present invention is to provide a vehicle seat frame in which a cushion frame main body and a slide rail are connected via a long bracket extending from the front part to the rear part of the cushion frame main part. An object of the present invention is to provide a vehicle seat frame having a lightweight structure that suppresses deformation of a slide rail when a large load is applied.

  1st invention of this invention is a vehicle seat frame, Comprising: A pair of slide rails with which the upper rail was slidably engaged with the lower frame extended in the front-back direction fixed to the cushion frame main-body part and the vehicle main body. A pair of brackets attached to the upper rail and connecting and supporting the cushion frame main body with respect to the upper rail, and at least one belt anchor bracket to which a belt anchor is attached. It extends from the front part to the rear part of the cushion frame main part, and the belt anchor bracket is attached to the bracket, and at the lower end of the belt anchor bracket, it is normal for the hook member attached to the lower rail and extending in the front-rear direction. They are separated and engaged when a heavy load is applied Wherein the hook part for preventing the deformation of the serial sliding rail is provided.

  According to the first aspect of the present invention, the load transmitted from the seat belt to the bracket through the belt anchor bracket at the normal time is transmitted from the bracket to the upper rail and supported by the engagement strength with the lower rail. This is because the hook portion of the belt anchor bracket is normally separated from the hook member of the lower rail. On the other hand, when a large load exceeding the engagement strength between the upper rail and the lower rail is applied from the seat belt to the belt anchor bracket in the event of a collision or the like, and the engagement portion between the upper rail and the lower rail is deformed, the belt anchor bracket is a hook member attached to the lower rail. And the load is directly transmitted to the hook member to prevent further deformation of the slide rail. As a result, the bracket only needs to perform the function of transmitting the load applied from the seat belt to the upper rail without deformation in a normal state. This is because the load is transmitted from the belt anchor bracket directly to the hook member attached to the lower rail at the time of a collision and the load applied to the bracket becomes small. From this, it is not necessary to reinforce the bracket, which is a long member, by increasing the thickness, and an increase in the weight of the vehicle seat frame can be suppressed.

  According to a second aspect of the present invention, in the first aspect, the hook member is engaged over the entire range in which the hook portion of the belt anchor bracket slides in the front-rear direction as the upper rail slides in the front-rear direction relative to the lower rail. It is formed so that it can be combined.

  According to the second aspect of the present invention, when a large load from the seat belt is applied to the belt anchor bracket within a range in which the longitudinal position of the slide rail can be adjusted, the load is transmitted to the hook member attached to the lower rail. Can do. Thereby, the load applied to the bracket can be reduced regardless of the position in the front-rear direction of the vehicle seat frame.

It is a perspective view which shows the cushion frame structure for motor vehicles of one Embodiment of this invention. It is a side view which shows the cushion frame structure for motor vehicles of the said embodiment. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2.

  1-3 show an embodiment of the present invention. This embodiment shows an example in which the present invention is applied to an automobile cushion frame (hereinafter referred to as a cushion frame). In each figure, each direction when the cushion 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 cushion frame 1 of the present embodiment has a back frame (not shown) attached to a rear end portion via a recliner (not shown) to constitute a seat frame. Since the recliner and the back frame have a known configuration, the description thereof will be omitted, and the cushion frame 1 will be described. Here, the cushion frame 1 corresponds to a “vehicle seat frame” in the claims.

  As shown in FIG. 1, the cushion frame 1 is a steel part, and includes a main body portion 10 on which a cushion pad is placed, a pair of slide rails 20 that are fixed to the floor F by extending in the front-rear direction, and slide rails. 20 includes a pair of brackets 40 that support the main body 10 connected to the belt 20 and a belt anchor bracket 50. Here, the main body 10 corresponds to a “cushion frame main body” in the claims.

  The main body 10 has a pair of side frames 11 extending in the front-rear direction on the left and right side portions thereof. The side frame 11 is a substantially rectangular plate-shaped press part, the longitudinal direction extending in the front-rear direction, and flanges extending in the seat outer direction are provided at the upper end portion and the lower end portion. A cylindrical front pipe 12 is attached to the side frame 11 at the front side thereof, and a cylindrical rear pipe 13 at the rear side thereof. A front panel 14 is attached to the front side portion of the side frame 11 so as to be movable up and down. Specifically, the front panel 14 is attached to the front end portions of the pair of left and right support arms 15, and the rear end portion of the support arm 15 is rotatably attached to the substantially center portion in the front-rear direction of the side frame 11 by the shaft 15a. ing. The front panel 14 moves up and down with respect to the side frame 11 as the support arm 15 rotates in the vertical direction about the shaft 15a.

  As shown in FIGS. 1 and 2, the main body 10 further has a lifter mechanism 30. The lifter mechanism 30 includes a front pipe 12 and a rear pipe 13, a pair of front links 31, a pair of rear links 32, and a pair of brackets 40. In other words, the pair of brackets 40 is a member that connects the slide rail 20 and the main body 10, and at the same time, is one of the constituent members of the lifter mechanism 30. Each of the pair of front links 31 has an upper end portion fixed to each terminal portion of the front pipe 12 and a lower end portion rotatably attached to the vicinity of the front end portion of the bracket 40. Each of the pair of rear links 32 has an upper end portion fixed to each end portion of the rear pipe 13 and a lower end portion rotatably attached to the vicinity of the rear end portion of the bracket 40. A sector gear 13 a is fixed near the left end of the rear pipe 13. The sector gear 13a is arranged so as to mesh with a pinion gear (not shown) attached to the left side frame 11. When the pinion gear is rotated by operating a lifter lever (not shown), the sector gear 13a is rotated and at the same time the rear pipe 13 is rotated. When the rear pipe 13 is rotated, the rear link 32 is rotated in the vertical direction about the axis 40b2 of the bracket 40. At this time, the front link 31, which is a part of the four-bar link composed of the side frame 11, the front link 31, the bracket 40, and the rear link 32, rotates in the vertical direction following the movement of the rear link 32. As a result, the main body 10 moves up and down with respect to the floor F.

  Each of the pair of left and right slide rails 20 includes a lower rail 21 that extends and fixed to the floor F in the front-rear direction, and an upper rail 22 that is slidably assembled to the lower rail 21. The slide rail 20 functions to make it possible to adjust the position of the cushion frame 1 in the front-rear direction with respect to the floor F.

  As shown in FIGS. 1 to 3, a hook member 60 is attached to the lower surface of the rear portion of the right lower rail 21. The hook member 60 is a member formed by bending a part of a steel plate, and the thickness thereof is set to be approximately the same as that of the belt anchor bracket 50. A bottom surface portion 61 extending opposite to the lower surface of the lower rail 21, a standing wall portion 62 extending upward from the right end portion of the bottom surface portion 61 perpendicularly to the bottom surface portion 61, and a key provided at the upper end portion of the standing wall portion 62 And a locking portion 63 having a shape. In addition, the connection part of the bottom face part 61 and the standing wall part 62 is formed in C chamfering shape along the cross section of the lower rail 21. As shown in FIG. The length of the hook member 60 in the front-rear direction is set to be slightly larger than the length in which the upper rail 22 can slide in the front-rear direction with respect to the lower rail 21. Specifically, it is slightly longer than ½ of the longitudinal length of the bracket 40. The upright wall portion 62 extends upward along the right side surface of the lower rail 21, and the height of the upper end portion thereof is substantially equal to the height of the upper end portion of the lower rail 21. The locking portion 63 is a portion that is folded back so as to extend downward from the upper end portion of the standing wall portion 62 toward the outside of the seat. The upper part of the locking part 63 is formed in an R shape. The locking portion 63 of the hook member 60 is disposed to face the hook portion 52 of the belt anchor bracket 50 described later with a predetermined clearance. As a result, the hook rail 60 and the belt anchor bracket 50 do not interfere with each other so that the upper rail 22 slides with respect to the lower rail 21 and the front and rear positions of the cushion frame 1 with respect to the floor F are adjusted. On the other hand, when a large load is applied from the seat belt to the belt anchor bracket 50 in the event of a collision or the like, and the engaging portion between the upper rail 22 and the lower rail 21 is deformed, the hook portion 52 of the belt anchor bracket 50 is brought into contact with the engaging portion 63 of the hook member 60. The load is engaged and the load is directly transmitted to the hook member 60.

  The bracket 40 is a U-shaped member whose cross section is opened upward and extends in the front-rear direction, and is attached to the upper surfaces of the left and right upper rails 22, respectively. The length of the bracket 40 in the front-rear direction is set substantially equal to that of the upper rail 22. The bracket 40 has a bottom surface portion 40a extending opposite to the upper surface of the upper rail 22, and two standing wall portions 40b extending upward from the left and right end portions of the bottom surface portion 40a perpendicularly to the bottom surface portion 40a. Yes. In both the left and right brackets 40, the lower end portion of the front link 31 is attached in the vicinity of the front end portion of the standing wall portion 40b on the seat inner side so as to be pivotable in the front-rear direction around the shaft 40b1, and The lower end portion of the rear link 32 is attached to the shaft 40b2 so as to be rotatable in the front-rear direction. That is, the front link 31 and the rear link 32 are rotatably attached to the left standing wall 40b in the right bracket 40 and to the right standing wall 40b in the left bracket 40.

  The belt anchor bracket 50 is a member formed by bending a part of a steel plate, and the thickness thereof is set to be about 20% larger than that of the bracket 40. The belt anchor bracket 50 includes a main body 51 that extends slightly upward in a side view and extends upward, a hook-shaped hook 52 provided at the lower end of the main body 51, and an upper end of the main body 51. Belt anchor mounting portion 53 provided on the portion. The belt anchor bracket 50 is attached to the right surface (surface outside the seat) with bolts and nuts 54 in the vicinity of the rear end portion of the right vertical wall 40b of the right bracket 40. The length of the main body 51 in the front-rear direction is set slightly shorter than the width of the seat belt. That is, it is about 1/10 of the length of the bracket 40 in the front-rear direction. The main body 51 is attached to the upright wall 40b of the bracket 40 with bolts and nuts 54 at a substantially central portion in the vertical direction. The hook portion 52 is a portion that is folded back so as to extend from the lower end portion of the main body portion 51 toward the upper side inside the seat. The lower part of the hook part 52 is formed in an R shape. The belt anchor attaching portion 53 is a portion that fastens and holds an anchor plate attached to the end of the seat belt at a portion where the bolt is erected.

  The present embodiment configured as described above has the following operational effects. Under normal conditions, a load applied from the seat belt to the belt anchor bracket 50 is transmitted to the bracket 40 through bolts and nuts 54. The load transmitted to the bracket 40 is transmitted to the upper rail 22 and supported by the engagement strength of the slide rail 20 with the lower rail 21. At this time, since the bracket 40 does not have to be deformed in a load region that does not exceed the engagement strength between the upper rail 22 and the lower rail 21, the bracket 40 can be set to be thinner than the belt anchor bracket 50 and the hook member 60. On the other hand, when a large load exceeding the engagement strength between the upper rail 22 and the lower rail 21 is applied from the seat belt to the belt anchor bracket 50 at the time of a collision or the like, the engagement portion between the upper rail 22 and the lower rail 21 is deformed. At this time, the hook portion 52 of the belt anchor bracket 50 engages with the engaging portion 63 of the hook member 60 attached to the lower rail 21 and transmits the load directly to the hook member. The deformation of the upper rail 22 and the lower rail 21 until the hook portion 52 engages with the locking portion 63 is at a level that allows the relative sliding of both of them, and the sliding of the upper rail 22 and the lower rail 21 even after a large load is applied. Movement is possible. Further, the belt anchor bracket 50 and the hook member 60 are smaller members than the bracket 40. Thereby, it is not necessary to reinforce the bracket 40, which is a long member, by increasing the thickness, and an increase in weight can be suppressed.

  Further, the hook member 60 is set to a length that is slightly larger than the adjustable length of the position in the front-rear direction by the slide rail 20. Accordingly, when a large load from the seat belt is applied to the belt anchor bracket 50 within the range in which the slide rail 20 can be adjusted in the front-rear direction position, the load can be transmitted to the hook member attached to the lower rail. Thus, the load applied to the bracket 40 can be reduced regardless of the position of the main body portion 10 of the cushion frame 1 in the front-rear direction.

  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 member extending in the front-rear direction with a U-shape whose cross section is opened upward is used as the bracket 40. However, the present invention is not limited to this, and a member that extends in the front-rear direction with an L-shaped cross section may be used as long as interference with the rear link 32 is avoided.

  2. In the above embodiment, the present invention is applied to an automobile seat, but may be applied to a seat mounted on an airplane, a ship, a train, or the like.

1 Cushion frame (vehicle seat frame)
10 Main part (Cushion frame main part)
20 Slide rail 21 Lower rail 22 Upper rail 50 Belt anchor bracket 52 Hook part 60 Hook member 63 Locking part F Floor

Claims (2)

A vehicle seat frame,
A cushion frame main body, a pair of slide rails slidably engaged with a lower rail fixed to the vehicle body and extending in the front-rear direction, and the cushion frame attached to the upper rail and attached to the upper rail A pair of brackets for connecting and supporting the main body, and at least one belt anchor bracket to which a belt anchor is attached;
The bracket extends from the front part to the rear part of the cushion frame main part,
The belt anchor bracket is attached to the bracket, and the lower end portion of the belt anchor bracket is normally separated from a hook member extending in the front-rear direction attached to the lower rail, and is engaged when a heavy load is applied. A vehicle seat frame provided with a hook portion that prevents deformation of the slide rail. 2. The vehicle according to claim 1, wherein the hook member is formed to be engageable over the entire range in which the hook portion of the belt anchor bracket slides in the front-rear direction as the upper rail slides in the front-rear direction relative to the lower rail. Seat frame.

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