JP6033761B2 - Back frame structure of vehicle seat - Google Patents

Description

  The present invention relates to a back frame structure of a vehicle seat mounted on a vehicle such as an automobile, an airplane, a ship, and a train.

  As one of the back frame structures of a vehicle seat, in forming a frame-shaped back frame that is a skeleton of a seat back, a structure in which an upper frame is fixed to the upper end of a side frame is fixed in Patent Document 1 below. Have been described. This back frame is for a vehicle seat with a built-in three-point seat belt. In the back frame structure described in Patent Document 1, an end portion of an upper frame having a configuration in which a circular tube is bent in an L shape is applied to an upper portion of a side frame having a seat belt drawer attached to an upper end. Are fixed by welding.

JP 2013-189089 A

In the above-mentioned structure, since the end of the upper frame is abutted against the side frame, the contact area between the two is small and a strong load from the seat belt is applied to the side frame. In this case, there is a risk that stress concentrates on the welded portion and breaks. In order to prevent this, it is necessary to increase the diameter and wall thickness of the circular tube, thereby increasing the weight of the back frame.
In view of such a problem, an object of the present invention is to provide a back frame having a structure in which a side frame and an upper frame are joined to each other, and to provide a structure capable of suppressing an increase in weight while ensuring joining strength. .

According to a first aspect of the present invention, a first frame member extending in the vertical direction and having a closed cross-sectional shape portion, and a second frame member formed by bending a pipe-shaped member having one closed cross-sectional shape portion, A back frame structure of a vehicle seat formed in combination, wherein the second frame member includes a first side frame portion extending in a vertical direction, a second side frame portion extending in a vertical direction, and the first side frame. And an upper frame portion that connects upper ends of the second side frame portion and the outer cross-sectional shape of the closed cross-sectional shape portion of the second frame member is the same as that of the closed cross-sectional shape portion of the first frame member. The second frame member has at least a portion of the second side frame portion that is fitted into the inner cross-sectional shape. Wherein the back frame of the integrated portal is inserted into the closed cross section portion is formed.
According to the first invention, the first frame member and the second frame member constituting the back frame each have a closed cross-sectional shape portion, and the closed cross-sectional shape of the second frame member is within the closed cross-sectional shape portion of the first frame member. Since at least a part of the part is inserted and integrated to form a gate-shaped back frame, it is possible to join the first frame member and the second frame member with a wide contact area. As a result, it is possible to provide a back frame that has low stress concentration, high strength, and reduced weight increase.

According to a second aspect of the present invention, in the first aspect, the second side frame portion is shorter than the first side frame portion, and the second frame member is formed in an inverted J shape. .
According to the second invention, when inserting and joining at least a part of the closed cross-sectional shape portion of the second frame member into the closed cross-sectional shape portion of the first frame member, the length to be inserted is minimized. As a result, the overlapping portion between the first frame member and the second frame member can be reduced, and the increase in weight can be further suppressed while ensuring the bonding strength.

According to a third aspect of the present invention, in the first aspect, the first side frame portion and the second side frame portion have the same length, and the second frame member is formed in an inverted U shape. It is characterized by.
According to the third invention, a part of the closed cross-sectional shape portion of the second frame member is inserted into and joined to the full-closed cross-sectional shape portion of the first frame member, so that the first frame member extends over the entire length of the second frame. It can be reinforced with a member. This makes it possible to take measures such as optimizing the thickness of the first frame member and to optimize the strength and weight of the entire back frame.

According to a fourth aspect of the present invention, in the second aspect described above, in an end portion of the first frame member that is different from an end portion to which the second side frame portion of the second frame member is attached, A reinforcing member having the same cross-sectional shape as the second frame member is inserted into a closed cross-sectional shape portion of the first frame member.
According to the fourth aspect of the invention, in addition to the operation and effect of the second aspect of the invention, the end of the first frame member has a second frame at an end different from the end to which the second frame member is attached. Since the reinforcing member having the same cross-sectional shape as the member is inserted, the attachment portion of the first frame member to the reclining device can be reinforced. At this time, since the reinforcing member has the same cross-sectional shape as the second frame member, the reinforcing member fits into the closed cross-sectional shape portion of the first frame member and can be effectively reinforced. Furthermore, the end material of the second frame member can be used, and there is no need to make a separate member.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects, at least a part of the first frame member in the portion where the second frame member is inserted is the second frame member. It is characterized by being shrunk and fixed.
According to the fifth invention, in addition to the operational effects of any of the first to fourth inventions, at least a part of the first frame member in the portion where the second frame member is inserted is the second frame. Higher bond strength can be achieved because it is compressed and fixed toward the member.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the first frame member and the second frame member are made of a light alloy of aluminum or magnesium.
According to the sixth invention, in addition to the operational effects of any of the first to fifth inventions described above, the first frame member and the second frame member are made of a light alloy of aluminum or magnesium. Can be planned.

1 is a perspective view of a first embodiment of the present invention. It is a figure for demonstrating the 1st frame member and 2nd frame member of the said embodiment. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 1. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1. It is a VV arrow line sectional view of Drawing 1. It is a figure for demonstrating the 1st frame member and 2nd frame member of 2nd Embodiment of this invention.

  1 to 5 show a first embodiment of the present invention. 1st Embodiment shows the example which applied this invention to the back frame (henceforth a back frame) of the seat for motor vehicles. In each figure, each direction of the automobile when the automobile seat with the back frame attached is attached to the floor of the automobile is indicated by an arrow. In the following description, the description regarding the direction is made based on this direction.

  As shown in FIGS. 1 and 2, the back frame 10 of the first embodiment is a seat belt built-in type seat and can be attached with a seat belt winding device (not shown). The back frame 10 includes a first frame member 20 extending in the vertical direction and performing a right side frame function, a first side frame portion 31 extending in the vertical direction, a second side frame portion 33 extending in the vertical direction, and a first side. A second frame member 30 in which a frame portion 31 and an upper frame portion 32 connecting the upper ends of the second side frame portions 33 are formed by bending a pipe-shaped member having one closed cross-sectional shape portion; A center frame 50 that couples the frame member 20 and the second frame member 30 and a lower frame 60 are formed.

  The first frame member 20 is made of an aluminum alloy extruded material having a cross-sectional shape shown in FIG. In FIG. 3, the deformed hexagonal closed section 27 includes a side part 27 a, a front side part 27 b, another side part 27 c, a rear side part 27 f, a front side part 27 b and another side part. The front connecting portion 27d that connects the portions 27c, and the rear connecting portion 27e that connects the rear side portion 27f and the other side portion 27c. The side part 27a and the other side part 27c, the front side part 27b, and the rear side part 27f are in a parallel relationship, and the front side part 27b is the side part 27a, the other side part 27c, and the rear side part 27f. The front connecting part 27d and the rear connecting part 27e are formed thicker. The U-shaped cross-sectional shape portion 26 coupled to the closed cross-sectional shape portion 27 includes a side part 26a, a rear side part 26b, and another side part 26c. The side part 26a and the other side part 26c are in a parallel relationship, and the rear side part 26b is formed thicker than the side part 26a and the other side part 26c. The reason why the front side portion 27b and the rear side portion 26b are formed thick is to reinforce a portion where stress increases when a bending moment in the front-rear direction is applied to the first frame member 20. The reinforcing member 38 inserted in the closed cross-sectional shape portion 27 will be described later.

  As shown in FIGS. 1 and 2, the first frame member 20 is bent in a dogleg shape in a side view and has a shape in which the upper part warps backward from a portion 22 slightly below the middle part in the vertical direction. . Further, the portion extending up to about 2/3 of the entire length from the lower end to the upper part has a U-shaped cross-section 26 coupled to the closed cross-section 27 as shown in FIG. The cross-sectional shape is configured. As shown in FIG. 4, the section from the upper end portion to about 1/3 of the entire length has a closed cross-sectional shape portion 27 with a side portion 26a and a part of another side portion 26c standing rearward. It constitutes one closed cross-sectional shape. This is because the rear side part 26b, the side part 26a, and the other side part 26c of the U-shaped cross-sectional shape part 26 are moved upward from the lower end part about 2/3 of the entire length as a starting point. This is because the side 26a and the other side 26c are cut off so that the lengths of the side 26a and the other side 26c gradually shorten upward. The aim of this processing is necessary and sufficient at each part by changing the section modulus of the first frame member 20 in the vertical direction so as to correspond to the magnitude of the bending moment in the front-rear direction applied to the upper end of the first frame member 20. The purpose of this is to reduce the weight by using a large section modulus.

  As shown in FIGS. 1 and 2, a through hole 24 coaxial with the side part 27a and the other side part 27c is provided near the lower end of the first frame member 20, and the side part 26a and the other side part. A coaxial through hole 25 is formed in 26c. This is for attaching the first frame member 20 to a seat cushion frame (not shown) via a reclining device (not shown).

  The second frame member 30 is made based on an extruded material of an aluminum alloy having a cross-sectional shape shown in FIG. In FIG. 5, the deformed hexagonal closed cross-sectional shape portion 37 includes a side portion 37a, a front side portion 37b, another side portion 37c, a rear side portion 37f, a front side portion 37b, and other side portions. It is comprised from the front connection part 37d which connects the part 37c, and the rear connection part 37e which connects the rear side part 37f and the other side part 37c. The side part 37a and the other side part 37c, and the front side part 37b and the rear side part 37f are in a parallel relationship, and the side part 37a, the front side part 37b, the other side part 37c, and the front connection part 37d. The rear connecting portion 37e and the rear side portion 37f are all formed to have the same thickness. The reason why the second frame member 30 is formed with the same thickness is that the second frame member 30 has a smaller bending moment in the front-rear direction applied from the seat belt than the first frame member 20 and can ensure sufficient strength with the same thickness. The outer shape of the closed cross-sectional shape portion 37 is similar to the inner shape of the closed cross-sectional shape portion 27 of the first frame member 20 with a slight gap. Accordingly, the closed cross-sectional shape portion 27 of the first frame member 20 can be inserted inside the closed cross-sectional shape portion 37 of the second frame member 30.

  As shown in FIG. 1 and FIG. 2, the second frame member 30 is a first side that is bent in a dogleg shape in a side view and has a shape in which the upper part warps backward from a portion 32 slightly below the middle part in the vertical direction. A frame portion 31, a second side frame portion 33 that extends in the vertical direction and is shorter than the first side frame portion 31, and an upper frame portion that connects the upper ends of the first side frame portion 31 and the second side frame portion 33 to each other 32 is formed by bending one pipe-shaped member having a closed cross-sectional shape. The cross-sectional shapes of the first side frame portion 31, the second side frame portion 33, and the upper frame portion 32 are constant as shown in FIG. The upper frame portion 32 has two predetermined holes, and two holders 36 are attached thereto. Further, a coaxial through hole 34 and a coaxial through hole 35 are formed in the lower side of the first side frame portion 31 along the vertical direction in the side part 37a and the other side part 37c. This is for attaching the second frame member 30 to a seat cushion frame (not shown) via a reclining device (not shown).

  As shown in FIG. 1, the center frame 50 is a member formed by bending an extruded material of an aluminum alloy having a constant cross-sectional shape, and the first side frame portion 31 of the first frame member 20 and the second frame member 30. Are connected near the middle in the vertical direction. The hole 51 provided slightly to the right of the center is for attaching a seat belt retractor (not shown). The lower frame 60 is a member formed by bending an extruded material of an aluminum alloy having a substantially rectangular cross-sectional shape, and the first side frame portion 31 of the first frame member 20 and the second frame member 30 is arranged at the lower end in the vertical direction. Connected nearby. A seat belt guide (not shown) is attached to a corner portion 37 connecting the second side frame portion 33 and the upper frame portion 32 of the second frame member 30.

  A procedure for assembling the first frame member 20, the second frame member 30, the center frame 50, and the lower frame 60 to form the back frame 10 will be described. As shown in FIG. 2, the lower end portion of the second side frame portion 33 of the second frame member 30 is inserted into the closed cross-sectional shape portion 27 of the upper end portion of the first frame member 20. The inserted length is about 20 mm, and the combined length of the first frame member 20 and the second side frame portion 33 of the second frame member 30 in the inserted state is the first side frame of the second frame member 30. It becomes the same as the part 31 and forms the gate-shaped back frame 10. Electromagnetic contraction molding is performed on the upper end portion of the first frame member 20 into which the lower end portion of the second side frame portion 33 of the second frame member 30 is inserted. Here, electromagnetic tube forming is a technology for processing aluminum by using a magnetic field generated instantaneously by flowing a high-voltage current charged in a large-capacity capacitor through an electromagnetic coil. By disposing the electromagnetic coil outside the closed cross-sectional shape portion 27 of the first frame member 20 that is a workpiece and passing an electric current, the closed cross-sectional shape portion 27 of the first frame is contracted to the second side of the second frame member 30. The frame portion 33 is brought into close contact with the lower end portion. At this time, if roughening is performed to provide irregularities on the surface of the lower end portion of the second side frame portion 33 of the second frame member 30 inserted into the closed cross-sectional shape portion 27 of the first frame member 20, The degree of adhesion is increased and a stronger bond can be obtained. Thereafter, the back frame 10 is completed by fixing the center frame 50 and the lower frame 60 between the first frame member 20 and the second frame member 30 by welding or the like. Further, in the above procedure, instead of performing electromagnetic contraction tube forming, joining by press or joining by pressing with an adhesive interposed between the first frame member 20 and the second frame member 30 may be performed.

  As shown in FIGS. 2 and 3, a reinforcing member 38 having a length of about 50 mm created from the end material of the second frame member 30 is inserted into the closed cross-sectional shape portion 27 at the lower end portion of the first frame member 20. . The reinforcing member 38 has a through hole 38a at a position that coincides with the through hole 24 in the vicinity of the lower end portion of the first frame member 20 when inserted into the closed cross-sectional shape portion 27 at the lower end portion of the first frame member 20. ing. The through hole 24 and the through hole 38a are for attaching the first frame member 20 to a seat cushion frame (not shown) via a reclining device (not shown).

1st Embodiment comprised as mentioned above has the following effects.
Since the second side frame portion 33 of the second frame member 30 is inserted into the closed cross-sectional shape portion 27 of the first frame member 20 with respect to the upper portion of the first frame member 20, the electromagnetic shrink tube is formed. The area of the portion can be increased, and high-strength bonding with less stress concentration is possible. In addition, a reinforcing member 38 having the same cross-sectional shape as that of the second frame member 30 is inserted into the attachment portion of the first frame member 20 to the reclining device, so that the first frame member 20 is attached to the reclining device. The mounting part can be reinforced. At this time, since the reinforcing member 38 has the same cross-sectional shape as the second frame member 30, the reinforcing member 38 fits into the closed cross-sectional shape portion of the first frame member and can be effectively reinforced. Furthermore, the end material of the first frame member can be used, and there is no need to make a separate member separately. Furthermore, since the first frame 20, the second frame 30, the center frame 50, and the lower frame 60 are all made of an aluminum alloy, the weight can be reduced.

FIG. 6 shows a second embodiment of the present invention. Regarding the same configuration as that of the first embodiment, the same reference numerals are given to the drawings, and the description thereof is omitted.
The difference from the first embodiment is that the second frame member 30 connects the first side frame portion 31, the second side frame portion 331, and the upper ends of the first side frame portion 31 and the second side frame portion 331. The upper frame portion 32 is formed by bending a pipe-shaped member having a closed cross-sectional shape, and the lengths of the first side frame portion 31 and the second side frame portion 331 are the same. Accordingly, when the first frame member 20 and the second frame member 30 are joined, the second side frame portion 331 of the second frame member 30 is inserted over the entire length of the closed cross-sectional shape portion 27 of the first frame member 20. . In assembling, the second side frame portion 331 of the second frame member 30 is inserted into the closed cross-sectional shape portion 27 of the first frame member 20 and bent in an integrated state before bending. Near the lower end portion of the second side frame portion 331 of the second frame member 30, when inserted into the closed cross-sectional shape portion 27 of the first frame member 20 and integrated with the through hole 24 of the first frame member 20. A through-hole 331a is formed at a position to be performed. The through hole 24 and the through hole 331a are for attaching the first frame member 20 to a seat cushion frame (not shown) via a reclining device (not shown).

2nd Embodiment comprised as mentioned above has the following effects.
Since the second side frame portion 331 of the second frame member 30 is inserted and joined into the closed cross-sectional shape portion 27 of the entire length of the first frame member 20, the first frame member 20 is connected to the second frame member 30 over the entire length. Can be reinforced. As a result, measures such as optimizing the thickness of the first frame member 20 are possible, and it is possible to optimize the strength and weight of the entire back frame. That is, a lower grade material can be used as the aluminum alloy material used for the first frame member 20, and the material cost can be reduced.

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,
1. In the second embodiment, only the second side frame portion 331 of the second frame member 30 is inserted over the entire length of the closed cross-sectional shape portion 27 of the first frame member 20, but in this state, the first frame member 20 Electromagnetic contraction molding may be performed on a part of the closed cross-sectional shape portion 27. Thereby, the bond strength can be further improved. Moreover, you may give the joining by the press by which the joining by the press and the adhesive agent were interposed between the 1st frame member 20 and the 2nd frame member 30 instead of performing the electromagnetic shrink tube forming.
2. In the said embodiment, although the 1st frame member 20 and the 2nd frame member 30 used aluminum alloy, you may use not only this but a magnesium alloy, and may use these in combination.
3. 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.

DESCRIPTION OF SYMBOLS 10 Back frame 20 1st frame member 27 Closed cross-section shape part 30 2nd frame member 31 1st side frame part 32 Upper frame part 33,331 2nd side frame part 37 Closed cross-section shape part 38 Member for reinforcement

Claims (6)

A vehicle seat formed by combining a first frame member extending in the vertical direction and having a closed cross-sectional shape portion and a second frame member formed by bending a pipe-like member having one closed cross-sectional shape portion. The back frame structure of
The closed cross-sectional shape portion of the first frame member has a front side portion that extends perpendicularly to the front-rear direction of the first frame member and is positioned in the front direction of the first frame member, and the front side portion is It is formed thicker than other sides,
The second frame member includes a first side frame portion extending in the vertical direction, a second side frame portion extending in the vertical direction, and an upper frame connecting the upper ends of the first side frame portion and the second side frame portion. Consists of parts,
The outer cross-sectional shape of the closed cross-sectional shape portion of the second frame member is a shape that fits around the inner cross-sectional shape of the closed cross-sectional shape portion of the first frame member, and the second frame member has the second cross-sectional shape. 2. A back frame structure for a vehicle seat, wherein at least a part of two side frame portions is inserted into and integrated with the closed cross-sectional shape portion of the first frame member to form a gate-shaped back frame. .   2. The vehicle back frame structure according to claim 1, wherein the second side frame portion is shorter than the first side frame portion, and the second frame member is formed in an inverted J shape.   2. The vehicle seat back according to claim 1, wherein the first side frame portion and the second side frame portion have the same length, and the second frame member is formed in an inverted U shape. Frame structure.   3. The same cross-sectional shape as that of the second frame member according to claim 2, wherein an end portion of the first frame member is different from an end portion to which the second side frame portion of the second frame member is attached. A back frame structure for a vehicle seat, wherein the reinforcing member is inserted into a closed cross-sectional shape portion of the first frame member.   5. The method according to claim 1, wherein at least a part of the first frame member into which the second frame member is inserted is contracted and fixed toward the second frame member. A vehicle back frame structure characterized by the above. The vehicle back frame structure according to any one of claims 1 to 5, wherein the first frame member and the second frame member are made of a light alloy of aluminum or magnesium.

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