JP2012011891A - Seat back frame mounting structure and mounting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the following problem of a conventional structure: a pivot pin for pivoting a seat back frame with respect to a cushion frame is not located in the center of a lower pipe, so that a seat cushion frame requires a reinforced wide face for receiving an impact from the seat back frame at the time of collision.SOLUTION: A seat back frame mounting structure comprises: a seat back frame in which a pivot axis is aligned with an axial center of a reclining mechanism mounted on the vehicle outside of a seat cushion frame, and includes a lower pipe having an opening end on the vehicle inside; a seat cushion side frame formed on the vehicle inside of the seat cushion frame to couple the seat back frame to the seat cushion frame; and a hat-shaped hinge bracket having a recess directed to the vehicle outside and coupled to the seat cushion side frame with a caulking pin. The opening end of the lower pipe is inserted and fitted into the recess of the hat-shaped hinge bracket for welding.

Description

  The present invention relates to a seat back frame mounting structure in which a side collision countermeasure is taken.

  Various safety measures have been taken for vehicle seats to ensure the safety of passengers. One of the countermeasures against a side collision caused by a collision from the side of the vehicle is one of them. When something collides with the side of the vehicle, the door on the side of the vehicle is deformed inward. In this case, one measure for securing the occupant's living space is a side collision countermeasure applied to the seat frame.

  In Patent Document 1, in a vehicle seat in which a seat back frame has a lower frame, and an arm of a reclining mechanism is fixed to a lower portion of a side frame of the seat back frame, an inner side of the lower frame of the seat back frame is arranged. A reinforcement pipe is inserted from one end, the reinforcement pipe extends to the outer side frame of the seat back frame, a load transmission material is fixed to the inner end of the reinforcement pipe, and the load transmission material is attached to the inner side. A vehicle seat characterized by being disposed close to a reclining mechanism is disclosed.

  FIG. 4 shows a rear front view and a side view of the seat, and outlines the structure. Referring to FIG. 4, the seat back frame 100 is swingably connected to a base 125 of a seat cushion frame 130 slidably fixed on a lower rail 138 fixed to a floor panel 140 by a pivot pin 128. Bolts are fixed to the arm 126.

  The seat back frame 100 is formed from a single pipe, and a reinforcement pipe is inserted into the lower frame 131a (not shown), and a load transmission member 143 is provided at the opening end on the inner side. It is connected. In the case of a side collision, the impact force is transmitted from the lower frame 131a to the load transmission member 143, and further transmitted to the seat cushion frame 130 via the arm 126 and the base 125. At that time, the collision force is dispersed, and a space for a passenger sitting on the seat is secured.

  Here, the pivot pin 128 that swings the seat back frame 100 of the base 125 is attached to a position that is not the central axis of the pipe of the lower frame 131a.

Japanese Patent No. 3011231

  In the seat back frame mounting structure disclosed in Patent Document 1, the pivot pin 128 that pivots the seat back frame is not located at the center of the cross section of the lower frame 131a. The base 125 for transmitting to a large area requires a wide area having sufficient strength.

  This is because the position of the load transmission material 143 disposed on the end face of the lower pipe transmitting the impact changes depending on the reclining angle, as can be seen by comparing the reference numerals 143 and 143a in FIG. 4B. is there. That is, in the base 125, it is necessary to reinforce an area that covers the entire position of the load transmission member 143 in the swing range of the seat back frame 100. Reference numeral 143 indicates the position of the load transmission material when the seatback frame 100 is a solid line, and reference numeral 143a indicates the position of the load transmission material when the seatback frame 100 is at the position of a one-point difference line.

  Therefore, a member reinforced on a wide surface is required for the base 125 of the seat cushion frame 130 or the brackets thereof. This leads to an increase in vehicle weight. Further, since the seat back frame 100 must be screwed to the base 125 of the seat cushion frame 130 via the arm 126, there arises a problem that the number of parts increases.

  The present invention has been conceived in view of the above-described problems. Specifically, the pivot axis of the reclining mechanism provided on the vehicle outer side of the seat cushion frame coincides with the shaft center, and has an open end on the vehicle inner side. A seat back frame including a lower pipe; a seat cushion side frame formed on the vehicle inner side of the seat cushion frame for connecting the seat back frame to the seat cushion frame; Provided is a seat back frame mounting structure having a hat-type hinge bracket joined to a side frame with a caulking pin, and an opening end of the lower pipe being inserted and fitted into a concave side of the hat-type hinge bracket and joined by welding. To do.

  Further, the present invention provides a method of attaching the reclining seat mechanism to a skeleton formed of a pipe material provided with an opening end of a pipe on the inner side of the lower pipe as a method of attaching the seat back frame, and forming a seat back frame; A step of caulking and fixing a hinge bracket with a hinge pin to the seat cushion side frame on the inner side of the seat cushion frame on which the side frame is formed; and after inserting the opening end of the seat back frame into the recess of the hinge bracket, Provided is a seat back frame mounting method including a step of fixing a reclining seat mechanism to the outer side seat cushion side frame, and a step of welding the opening end of the seat back frame and the hinge bracket.

  According to the present invention, since the center of the lower pipe of the seat back frame becomes the swing shaft of the reclining mechanism, the area of the receiving member for transmitting the impact at the time of collision to the seat cushion frame can be reduced. This is because the position of the lower pipe center with respect to the seat cushion side frame does not change regardless of the angle of the seat back frame. More specifically, the area of the cross section of the lower pipe may be intensively strengthened.

  Further, since the seat back frame is directly pivotally supported by the seat cushion frame, an intermediate member such as an arm is not required, the number of parts is reduced, and the cost can be reduced.

  Further, when the seat back frame is attached to the seat cushion frame, since the hinge bracket and the lower pipe are welded last, there is an effect that dimensional variations between members can be easily absorbed.

It is a figure which shows the outline of the seat back frame of this invention. It is sectional drawing to which the junction part of the seat back frame of this invention and a seat cushion side frame was expanded. It is a figure which attaches the seat back frame of this invention to a seat cushion frame, and shows the whole seat. It is a figure which shows the outline of the seat back frame of a cited reference.

  Embodiments of the present invention will be described with reference to the drawings. When the vehicle travels forward, the front direction of the vehicle is referred to as “front”, the rear direction as “rear”, the roof direction of the vehicle as “upward”, and the ground direction as “downward”. .

  FIG. 1 schematically shows a seat back frame according to the present invention. The seat back frame 1 is constituted by a pipe member, and a skeleton is constituted by the upper pipe 2, the left and right side pipes (4 and 5), and the lower pipe 6. The seat back frame 1 is formed into a substantially rectangular skeleton by forming one pipe member into a substantially rectangular shape by bending at three locations and welding one end at a welding point 8 near the other end. . In addition, each part may be comprised with the separate pipe member.

  The left and right side pipes constitute the outer and inner pipes of the vehicle. They are called the outer side pipe 4 and the inner side pipe 5, respectively. The welding point 8 is a point where the inner side pipe 5 and the lower pipe 6 are welded.

  The lower pipe 6 has an opening end of a pipe member disposed inside the vehicle. Therefore, a bent portion of the pipe member is disposed on the vehicle outer side (outer side) of the lower pipe 6. Of course, when only the lower pipe 6 is constituted by a single pipe member, there may be an open end of the lower pipe 6 on the outer side.

  A reclining mechanism 12 is fixed to the outer side pipe 4. The reclining mechanism 12 includes a recliner 14 that swings the seat back frame 1, and a side bracket 13 that connects and fixes the recliner 14 and the outer side pipe 4.

  The side bracket 13 is firmly coupled to the outer side pipe 4 by welding or the like. The recliner 14 is fixed to the side bracket 13 with bolts or the like. Here, the pivot 15 of the recliner 14 is disposed so as to coincide with the central axis of the lower pipe 6.

  A hinge bracket 20 is disposed on the inner side of the lower pipe 6. The hinge bracket 20 has a hat shape. In other words, the flat donut-shaped brim has a concave portion at the center, and the opposite side of the concave portion is a mountain-height portion. As will be apparent from FIG. 2 to be described later, a caulking through hole 23 is formed in the mountainous portion 22. The opening end on the inner side of the lower pipe 6 is inserted and fitted into the recess 21 of the hinge bracket 20. Further, the hinge bracket 20 and the lower pipe 6 are joined by welding. Reference numeral 27 represents the depth of the concave portion of the hinge bracket 20.

  In FIG. 2, the expanded sectional view of the junction part of the hinge bracket 20 and the lower pipe 6 is shown. The inner side pipe 5 and the lower pipe 6 are welded at the welding point 8 as described above. The open end 7 of the lower pipe 6 is inserted and fitted into the recess 21 of the hinge bracket 20. That is, the inner diameter of the recess 21 of the hinge bracket 20 is larger than the outer diameter of the lower pipe 6 so as to be inserted and fitted.

  A hinge through hole 23 is formed at the apex of the peak portion 22 of the hinge bracket 20. The center of the through hole 23 coincides with the pivot 15.

  On the other hand, reference numeral 31 denotes an inner seat cushion side frame of the seat cushion frame 30 which will be described later with reference to FIG. The seat cushion side frame 31 has a through hole 34 formed at a position corresponding to the pivot 15. Then, the hinge pin 28 is inserted and secured by overlapping the through hole 23 of the hinge bracket 20 and the through hole 34 of the seat cushion side frame 31.

  Then, the lower pipe 6 inserted and fitted into the recess 21 of the hinge bracket 20 and the collar 24 of the hinge bracket 20 are joined by welding 25. Therefore, the lower pipe 6 is fixed on the outer side by the reclining mechanism 12, and the inner side is fixed to the seat cushion side frame 31 via the hinge bracket 20. Further, since the hinge bracket 20 and the seat cushion side frame 31 are caulked and fixed by the hinge pins 28, the lower pipe 6 is pivotally supported by the seat cushion side frame 31.

  FIG. 3 shows a state in which the seat back frame 1 is fixed to the seat cushion frame 30. Side frames 31 and 32 extend from the seat cushion frame 30 on the inner side and the outer side, respectively. The reclining mechanism 12 is fixed to the outer side seat cushion side frame 32 with bolts or the like. An upper rail 36 is fixed below the seat cushion frame 30. The upper rail 36 is fixed on a lower rail 38 fixedly arranged on the floor panel 40 so as to be slidable forward and backward.

  Next, the connecting process of the seat back frame 1 and the seat cushion frame 30 of the present invention will be described. A seat cushion frame 30 on which seat cushion side frames (31 and 32) are formed is prepared in advance. Referring to FIG. 1 again, a skeleton in which a pipe member is formed into a substantially rectangular shape by a bending method and welding is prepared. The reclining mechanism 12 is joined to the skeleton by welding or the like.

  At this time, the wire bracket 16 can be welded to the inner side pipe 5, and the wire 17 can be disposed between the side bracket 13. A center pipe 18 may be inserted between the inner side pipe 5 and the outer side pipe 4 for reinforcement. Moreover, you may arrange | position a cross member (not shown) and the headrest attaching part 10 between the outer side pipe 4 and the inner side pipe 5 as needed. A structure in which the reclining mechanism 12 is bonded to at least the skeleton is referred to as a seat back frame 1.

  Referring to FIG. 2, on the other hand, the hinge bracket 20 is caulked and fixed to the inner side seat cushion side frame 31 by a hinge pin 28. Next, referring to FIG. 3, the seat back frame 1 is configured such that the opening end 7 of the lower pipe 6 is first inserted into the recessed portion 21 of the hinge bracket 20 that is fixed to the seat cushion side frame 31 on the inner side of the seat cushion frame 30. Insert and fit.

  Thereafter, the reclining mechanism 12 is fixed to the outer side seat cushion side frame 32 with a bolt or the like. In this case, it may be fixed by welding. Finally, the flange 24 of the hinge bracket 20 and the lower pipe 6 are welded 25 and joined.

  In this way, an error in the dimension between the seat cushion side frames and the total length of the lower pipe 6 including the reclining mechanism 12 is determined by inserting and fitting the hinge bracket 20 and the lower pipe 6 (reference numeral 27 in FIG. 2). Can be absorbed. That is, when the seat back frame 1 is fixed to the seat cushion frame 30, it is not necessary to give the hinge pin 28 a dimension absorption allowance, so that rattling can be minimized. The seat to which the seat back frame 1 is connected in this manner is disposed on the lower rail 38 disposed in advance on the floor panel 40.

  Next, the action at the time of a side collision will be described. Referring to FIG. 3, when the vehicle collides from the side direction, the seat receives a deformation force from outer side 32. At this time, the lower pipe 6 of the seat back frame 1 transmits a force from the outer side to the inner side, and transmits a deformation force to the seat cushion side frame 31. This force is transmitted to the seat cushion frame 30 and dispersed, thereby contributing to securing a space for an occupant sitting on the seat.

  At this time, the seat cushion side frame 31 receives the collision force transmitted to the lower pipe 6, but the center of the lower pipe 6 coincides with the pivot axis of the swing at the time of reclining. Regardless of this, an impact at the time of a side collision is applied to a predetermined position of the seat cushion side frame 32.

  Therefore, if the portion where the hinge bracket 20 of the seat cushion side frame 31 is fixed by caulking is reinforced, it is possible to cope with an impact at the time of a side collision.

  The present invention can be suitably used for a structure in which a seat back frame is connected to a seat cushion frame.

DESCRIPTION OF SYMBOLS 1 Seat back frame 2 Upper pipe 4 Outer side pipe 5 Inner side pipe 6 Lower pipe 7 Open end 8 Welding point 10 Headrest attachment part 12 Reclining mechanism 13 Side bracket 14 Recliner 15 Pivot 16 Wire bracket 17 Wire 20 Hinge bracket 21 Concave part 22 Height part 23 Through hole 24 Collar 28 Hinge pin 30 Seat cushion frame 31 Inner seat cushion side frame 32 Outer seat cushion side frame 34 Through hole 36 Upper rail 38 Lower rail 40 Floor panel

Claims (2)

A seat back frame including a lower pipe having an opening end on the vehicle inner side, the axis of which coincides with the pivot axis of a reclining mechanism provided on the vehicle outer side of the seat cushion frame;
A seat cushion side frame formed on the vehicle inner side of the seat cushion frame to connect the seat back frame to the seat cushion frame;
A hat-shaped hinge bracket that is directed to the concave side toward the vehicle outer side and is coupled to the seat cushion side frame by a hinge pin;
A seat back frame mounting structure in which an opening end of the lower pipe is inserted and fitted into a concave side of the hat-shaped hinge bracket and joined by welding. Connecting a reclining seat mechanism to a skeleton formed of a pipe material having an opening end of the pipe on the inner side of the lower pipe, and forming a seat back frame;
Caulking and fixing a hinge bracket with a hinge pin to the seat cushion side frame on the inner side of the seat cushion frame on which the seat cushion side frame is formed;
Fixing the reclining seat mechanism to the seat cushion side frame on the outer side after inserting the opening end of the seat back frame into the recess of the hinge bracket;
A seat back frame mounting method comprising a step of welding the opening end of the seat back frame and the hinge bracket.