JP5838913B2 - Manufacturing method for seat frame structure of vehicle seat - Google Patents

Description

The present invention relates to a method for manufacturing a seat frame structure for a vehicle seat.

  In a seat frame of a vehicle seat, for example, as disclosed in Patent Document 1, a side frame portion of a seat frame includes a first leg portion and a second leg portion that form a bifurcated shape. There is one in which the fixing member is fixed across the portion and the second leg portion.

German Utility Model Gazette DE 29816819U1

By the way, in the seat frame structure disclosed in Patent Document 1, the fixing member is fixed by welding across the first leg portion and the second leg portion of the side frame portion of the seat frame.
For this reason, the material which can weld a side frame part and a fixing member mutually, for example, when a side frame part is an aluminum alloy, a fixing member must also be formed from an aluminum alloy, and selection of material The degree of freedom is limited.
Moreover, the operation | work which welds a fixing member ranging between a 1st leg part and a 2nd leg part was also troublesome.

In view of the above problems, an object of the present invention is for a vehicle that can be easily fixed without welding a fixing member across a first leg portion and a second leg portion of a side frame portion of a seat frame. It is to provide a method for manufacturing a seat frame structure of a seat.

In order to solve the above-described problem, a method for manufacturing a seat frame structure for a vehicle seat according to claim 1 of the present invention is the first leg in which the side frame portion of the seat frame forming the frame portion of the vehicle seat has a bifurcated shape. A vehicle seat frame structure manufacturing method in which a fixing member is fixed between the first leg portion and the second leg portion.
Engaging portions that are slidably engaged in the longitudinal direction of the first leg portion and the second leg portion are formed on both sides of the fixing member,
The first leg portion and the second leg portion are elastically deformed in a direction toward or away from each other, and the engaging portion with respect to a longitudinal end portion of the first leg portion and the second leg portion When the fixing member is slid to a set fixing position in a state where the first leg portion and the second leg portion are engaged, a resilient force based on elastic deformation of the first leg portion and the second leg portion acts on the engaging portion. It is characterized by being configured.

According to the above configuration, the first leg portion and the second leg portion are elastically deformed in a direction toward or away from each other, and at the longitudinal end portions of the first leg portion and the second leg portion of the side frame portion. On the other hand, the fixing member is slid to the set fixing position in a state where the engaging portion of the fixing member is engaged.
Accordingly, the fixing member can be easily fixed without being welded between the first leg portion and the second leg portion of the side frame portion.
Then, in the fixed state of the fixing member, the elastic force based on the elastic deformation of the first leg portion and the second leg portion acts on the engaging portion of the fixing member. For this reason, the engaging force by the engaging part of a fixing member increases compared with the state without a resilient force.
As a result, the side frame portion and the fixing member can be formed of different kinds of metal materials that cannot be welded to each other, and the fixing member is firmly fixed across the first leg portion and the second leg portion. can do.

A method for manufacturing a seat frame structure for a vehicle seat according to claim 2 is the method for manufacturing a seat frame structure for a vehicle seat according to claim 1, wherein the seat frame is uniformly formed by extrusion molding of a light alloy material. It is formed by bending an extruded product formed in the shape of the cross section of the first leg by slitting the side frame portion from one end to the other end in the longitudinal direction. And the second leg are separated by the slit hole, and each of the first leg and the second leg has a receiving portion that is slidably engaged with the engaging portion of the fixing member. It is characterized by being formed continuously in the direction.

  According to the above configuration, the seat frame is formed in a uniform cross-sectional shape by extrusion molding of a light alloy material, so that the fixing member is continuously formed in the longitudinal direction of each of the first leg portion and the second leg portion. A receiving portion that is slidably engaged with the engaging portion can be easily formed.

It is a perspective view which shows the seat frame structure (seat back frame structure) of the vehicle seat which concerns on Example 1 of this invention. It is a cross-sectional view which similarly shows the upper frame part of the seat back frame which follows the II-II line of FIG. It is a side view which expands and shows the state which mounted | wore the side frame part with the upper arm of the reclining mechanism as a fixing member which similarly forms one member of a seat back frame. FIG. 4 is a plan sectional view of the upper arm (fixing member) along the line IV-IV in FIG. 3. It is a perspective view which similarly shows an upper arm from an inner side. Similarly, it is a perspective view showing a state in which the first leg portion and the second leg portion of the side frame portion are opened in the front-rear direction to an angular position set in the front-rear direction with the upper end portion of the slit hole as a branching portion. Similarly, it is explanatory drawing which shows the state by which the engaging part of the one side of the upper arm was engaged with the longitudinal direction edge part of a 1st leg part and a 2nd leg part. Similarly, in a state where the first leg and the second leg are elastically deformed so as to approach each other, and the engaging portion of the upper arm is engaged with the longitudinal ends of the first leg and the second leg. It is explanatory drawing which shows the state which slides an upper arm. It is explanatory drawing which shows the state by which the upper arm was similarly slid and fixed to the fixing position of a 1st leg part and a 2nd leg part. It is explanatory drawing which shows the other embodiment of this invention, and shows the state by which the engaging part of the one side of the upper arm was engaged with the longitudinal direction edge part of the 1st leg part and the 2nd leg part. Similarly, the first leg and the second leg are elastically deformed in a direction away from each other, and the engaging portion of the upper arm is engaged with the longitudinal ends of the first leg and the second leg. It is explanatory drawing which shows the embodiment which slides an upper arm.

  A mode for carrying out the present invention will be described in accordance with an embodiment.

A first embodiment of the present invention will be described with reference to the drawings.
In the first embodiment, a case where the seat frame of the vehicle seat is a seat back frame is illustrated.
As shown in FIG. 1, a seat back frame 21 as a seat frame includes an upper frame portion 30 and left and right side frames that are bent downward from both ends of the upper frame portion 30 and spaced apart from each other in the seat width direction. Part 40.

In the first embodiment, the seat back frame 21 is formed by an extruded product formed in a long and uniform cross-sectional shape such as an aluminum alloy.
As shown in FIG. 2, the seat back frame 21 includes a first component 22, a second component 25, and both the first and second components 22, 25 in the front-rear direction. And a connecting portion 28 that is connected at a predetermined interval.
The first component 22 includes a closed cross-sectional portion 23 having a substantially square hollow closed cross-section, and an open cross-section formed adjacent to the connecting portion 28 side of the closed cross-sectional portion 23 and partially opened (inside). And an open cross-sectional portion 24.
The second component 25 is adjacent to the closed cross-section 26 having a substantially trapezoidal hollow closed cross-section facing the closed cross-section 23 of the first component 22, and the connecting section 28 side of the closed cross-section 26. And an open cross-sectional portion 27 having an open cross-section that is partially formed (inner side facing the opening of the open cross-sectional portion 24 of the first component 22).

The upper frame portion 30 of the seat back frame 21 is arranged with the connecting portion 28 on the upper side, the first component portion 22 on the front side, and the second component portion 25 on the rear side.
Further, the first component 22 of the upper frame portion 30 is formed with notches 31 at predetermined intervals in the left-right direction, and these notches 31 have a pair of left and right aluminum alloy support holders 37 of the headrest device. Is fixed by welding or the like.

As shown in FIG. 1, the left and right side frame portions 40 are arranged with the connecting portion 28 on the outside, the first component portion 22 on the front side, and the second component portion 25 on the rear side.
Further, the side frame portion 40 is bent in the front-rear direction at a portion from the lower portion than the intermediate portion in the height direction, so that the side surface has a dogleg shape.
As shown in FIG. 1, a slit hole 41 is cut into the side frame portion 40 from the lower end of the connecting portion 28 to the vicinity of the upper end portion, and the first component portion 22 and the second component portion 25 are connected to the slit hole 41. Are opened in the front-rear direction to the angular position set as the branching portion 42.
The side frame portion 40 includes a first leg portion 44 on the front side constituted by the first component portion 22 (including the front side of the slit hole 41 of the connecting portion 28) and a second component portion 25 (the slit of the connecting portion 28). And a second leg portion 45 on the rear side that includes the rear side of the hole 41.

An upper arm 52 (corresponding to the fixing member of the present invention) of the reclining mechanism is attached between the first leg portion 44 and the second leg portion 45 below the side frame portion 40.
In the first embodiment, the upper arm 52 is made of a steel plate, and, as shown in FIGS. 3 to 5, a flat portion 52a having a lower plate width dimension larger than an upper plate width dimension is formed at the center in the front-rear direction. A stepped curved portion 55 bent in a stepped shape toward the inside is formed on both front and rear sides of the flat portion 52a.

As shown in FIGS. 3 to 5, the end portions of both stepped curved portions 55 of the upper arm 52 are from the longitudinal end portions of the first leg portion 44 and the second leg portion 45 (lower end portion in this embodiment 1). Engaging portions 53 and 54 each having a C-shaped cylindrical cross section that can be slidably engaged in the longitudinal direction (upward) and can be elastically reduced are formed.
Further, at the lower end of at least one engaging portion 53 (both engaging portions 53 and 54 in FIG. 5) of the upper arm 52, a stopper that restricts sliding in the longitudinal direction of the first leg portion 44 and the second leg portion 45. The pieces 70 and 71 are bent horizontally.

As shown in FIG. 4, the upper arm 52 has upper ends of both engaging portions 53, 54 at the first leg portion 44 (first component portion 22) and the second leg portion 45 (first portion) of the side frame portion 40. The open cross-sections 24 and 27 respectively formed in the two component parts 25) are used as receiving parts 24a and 27a, and are inserted (lightly press-fitted) from the lower ends of the receiving parts 24a and 27a.
The upper arm 52 has both engaging portions 53 and 54 extending upward along the receiving portions 24a and 27a until the stopper pieces 70 and 71 are in contact with the lower ends of the first leg portion 44 and the second leg portion 45. To be fixed.
That is, in the first embodiment, in the state before the upper arm 52 is attached across the first leg portion 44 and the second leg portion 45, the distance between the engaging portions 53, 54 of the upper arm 52 is determined. The first leg portion 44 and the second leg portion 45 of the side frame portion 40 are arranged so that the distance between the lower portions of the receiving portions 24a and 27a between the first leg portion 44 and the second leg portion 45 is larger. With the branch portion 42 of the slit hole 41 as a fulcrum, it is plastically deformed and opened in the front-rear direction.

Further, in the first embodiment, as shown in FIGS. 3 and 5, the upper end of the flat portion 52a of the upper arm 52 is high in the direction in which the load acts (the front side in the first embodiment), and the opposite side (this embodiment). In FIG. 1, it is formed in an inclined or curved shape that is gradually lowered toward the rear side. Further, a flange portion 57 bent in the sheet width direction is formed on the inclined surface or curved surface at the upper end of the flat portion 52a of the upper arm 52 to enhance the torsional rigidity.
In addition, a shaft hole 60 into which an operation shaft (not shown) of the reclining mechanism is fitted is formed at a lower portion of the flat portion 52 a of the upper arm 52, and components of the reclining mechanism ( A plurality of fixing holes 61 for fixing (not shown) are formed.

The vehicle seat frame (seat back frame) structure according to the first embodiment is configured as described above.
Therefore, when the upper arm 52 is fixed to the set fixing position across the first leg 44 and the second leg 45 of the side frame part 40, first, as shown in FIGS. The upper end portion of the engaging portion 53 on the front side of the upper arm 52 is inserted (lightly press-fitted) from below the receiving portion 24a of the one leg portion 44.
Next, as shown in FIG. 8, the first leg portion 44 and the second leg portion 45 are elastically deformed in a direction in which the first leg portion 44 and the second leg portion 45 approach each other, and the rear of the upper arm 52 from below the receiving portion 27 a of the second leg portion 45. The upper end portion of the engaging portion 54 on the side is inserted (lightly press-fitted) and slid upward.

Subsequently, as shown in FIG. 9, the upper arm 52 is slid to a fixed position where the stopper pieces 70 and 71 at the lower end of the upper arm 52 abut against the lower ends of the first leg portion 44 and the second leg portion 45.
Thereby, the elastic force based on the elastic deformation of the first leg portion 44 and the second leg portion 45 acts on the engaging portions between the engaging portions 53 and 54 and the receiving portions 24a and 27a. The upper arm 52 is fixed across the fixing position between the first leg portion 44 and the second leg portion 45.

As described above, the engaging portions 53 and 54 of the upper arm 52 are engaged with the receiving portions 24a and 27a of the first leg portion 44 and the second leg portion 45, so that the first leg portion 44 and the second leg portion 44 are engaged with each other. The upper arm 52 straddles between the first leg portion 44 and the second leg portion 45 of the side frame portion 40 by sliding the leg portion 45 elastically in a direction approaching each other to a fixed position set. Can be easily fixed without welding.
In the state where the upper arm 52 is fixed at the fixed position, the elastic force based on the elastic deformation of the first leg portion 44 and the second leg portion 45 causes the engagement portions 53 and 54 and the receiving portions 24a and 27a to Therefore, the engaging force between the engaging portions 53 and 54 and the receiving portions 24a and 27a is increased as compared with the state where the elastic force is not applied.
As a result, the seat back frame 21 and the upper arm 52 of the reclining mechanism cannot be welded to each other (in this embodiment, the seat back frame 21 is formed of an aluminum alloy material, and the upper arm 52 is a steel plate). In addition, the upper arm 52 can be firmly fixed across the first leg portion 44 and the second leg portion 45 of the side frame portion 40.

  In the first embodiment, the seat back frame 21 is formed into a uniform cross-sectional shape by extrusion molding of a light alloy material such as an aluminum alloy, whereby the first leg portion 44 and the second leg portion 44 of the side frame portion 40 are formed. The receiving portions 24a and 27a that are slidably engaged with the engaging portions 53 and 54 of the upper arm 52 can be easily formed continuously in the longitudinal direction of the leg portion 45.

In addition, this invention is not limited to the said Example 1, In the range which does not deviate from the summary of this invention, it can implement with a various form.
For example, in the first embodiment, the engaging portions 53 and 54 of the upper arm 52 are engaged with the receiving portions 24a and 27a of the first leg portion 44 and the second leg portion 45, and the first leg portion 44 and The second leg portion 45 is elastically deformed in the direction to approach each other and is slid to the fixed position. However, as shown in FIGS. 10 and 11, the first leg portion 44 and the second leg portion 45 are moved away from each other. It may be configured to be elastically deformed in the direction and slide to a fixed position.
In the first embodiment, the flat portion 52a of the upper arm 52 of the reclining mechanism is exemplified to have a lower plate width dimension larger than an upper plate width dimension. Even if the plate width dimensions are the same, the present invention can be implemented.
Further, in the first embodiment, the case where the seat frame is the seat back frame 21 is exemplified, but the present invention can be implemented even when the seat frame is a seat cushion frame forming a skeleton part of the seat cushion. .

21 Seat back frame (seat frame)
24a, 27a Receiving part 40 Side frame part 44 First leg part 45 Second leg part 52 Upper arm (fixing member)
53, 54 Engagement part

Claims (2)

A side frame portion of a seat frame that forms a skeleton portion of a vehicle seat has a bifurcated first leg portion and a second leg portion, and straddles between the first leg portion and the second leg portion. A method for manufacturing a seat frame structure for a vehicle seat in which a fixing member is fixed,
Engaging portions that are slidably engaged in the longitudinal direction of the first leg portion and the second leg portion are formed on both sides of the fixing member,
The first leg portion and the second leg portion are elastically deformed in a direction toward or away from each other, and the engaging portion with respect to a longitudinal end portion of the first leg portion and the second leg portion When the fixing member is slid to a set fixing position in a state where the first leg portion and the second leg portion are engaged, a resilient force based on elastic deformation of the first leg portion and the second leg portion acts on the engaging portion. A method for manufacturing a seat frame structure for a vehicle seat, characterized by being configured. It is a manufacturing method of the seat frame structure of the vehicular seat according to claim 1,
The seat frame is formed by bending an extruded product formed into a uniform cross-sectional shape by extrusion molding of a light alloy material,
In the side frame part, the first leg part and the second leg part are separated by the slit hole by cutting a slit hole from one end in the longitudinal direction toward the other end part,
Each of the first leg portion and the second leg portion is formed with a receiving portion that is slidably engaged with an engaging portion of a fixing member in the longitudinal direction. Of manufacturing a seat frame structure for a vehicle.

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