JP5327675B2 - Vehicle seat - Google Patents

Description

  The present invention belongs to the technical field of vehicle seats.

  Conventionally, a vehicle seat has a left and right divided structure to reduce the weight.

JP 2006-281938 A

  However, the prior art has a problem that a decrease in strength due to welding and a decrease in accuracy due to welding distortion occur.

  The present invention has been made paying attention to the above-mentioned problems, and an object thereof is to provide a vehicle seat capable of preventing a decrease in strength due to welding and a decrease in accuracy due to welding distortion. .

  In order to achieve the above object, the present invention is characterized in that the seat frame constituting the vehicle seat is mechanically fastened.

  Therefore, in this invention, the fall of the intensity | strength by welding and the fall of the precision by welding distortion can be prevented.

It is a figure which shows the vehicle body structure of the electric vehicle carrying the vehicle seat of Example 1. FIG. 1 is a perspective view of a vehicle seat according to Embodiment 1. FIG. It is a side view of the vehicle seat of Example 1. FIG. 2 is an exploded perspective view of main structural members of the vehicle seat according to the first embodiment. 3 is an explanatory perspective view of a headrest in Embodiment 1. FIG. It is explanatory drawing which shows the edge part structure of the sheet | seat skin in Example 1. FIG. In Example 1, it is explanatory drawing which shows the state which attached the sheet | seat skin to the frame member. In Example 1, it is explanatory drawing of the intermediate | middle assembly state of a right frame and a left frame. In Example 1, it is explanatory drawing of the state which attached the cushion frame to the right frame and the left frame. In Example 1, it is explanatory drawing of the state which attached the rear member to the right frame and the left frame. In Example 1, it is explanatory drawing of the state which attached the headrest to the right frame and the left frame. It is explanatory drawing of the attachment structure of a sheet | seat skin.

  Hereinafter, embodiments for realizing the vehicle seat of the present invention will be described.

First, the configuration will be described.
FIG. 1 is a diagram illustrating a vehicle body structure of an electric vehicle on which the vehicle seat according to the first embodiment is mounted.
The seat 1 of Example 1 is mounted on an electric vehicle 101. The electric vehicle 101 has a body structure in which each member is made of an aluminum material and is lightened.
FIG. 2 is a perspective view of the vehicle seat according to the first embodiment. FIG. 3 is a side sectional view of the vehicle seat of the first embodiment. FIG. 4 is an exploded perspective view of main structural members of the vehicle seat of the first embodiment.
The seat 1 includes a left frame 2, a right frame 3, a cushion frame 4, a rear member 5, a headrest 6, a seat skin 7, and bolts 8.
The left frame 2 is a single pipe, and is a frame member that forms a left leg portion of the seat 1 and an outer frame of a backrest portion by a bent shape.
The right frame 3 is a single pipe, and is a frame member that forms a right leg portion of the seat 1 and an outer frame of a backrest portion by a bent shape.

The upper end and lower end (front end) of the left frame 2 and the upper end and lower end (front end) of the right frame 3 are bent so as to face each other, and the other is inserted into one end. In the first embodiment, the upper end portion 21 and the lower end portion 22 of the left frame 2 are expanded in diameter, and the upper end portion 31 and the lower end portion 32 of the right frame 3 are inserted. Details will be described later.
The cushion frame 4 is a single pipe and is a frame member that constitutes the outer frame of the seat portion of the seat 1 by a bent shape.
The rear member 5 is a single pipe, and is a frame member that folds the seat skin 7 at the boundary between the seat portion and the backrest portion of the seat 1.

The headrest 6 is a head portion of a backrest portion of the seat 1 and is attached to upper end portions of the left frame 2 and the right frame 3.
FIG. 5 is an explanatory perspective view of the headrest in the first embodiment.
The headrest 6 includes a frame portion 61, a mounting portion 62, and a reinforcing member 63. The frame portion 61 is a member obtained by bending a single pipe so as to have a U-shape that opens downward, and its lower end is attached to the attachment portion 62 in advance.
The attachment portion 62 is a U-shaped member whose cross section is open at the bottom, and is a member that is attached to the upper end portions of the left frame 2 and the right frame 3 with bolts.
The reinforcing member 63 is a plate material attached to the frame portion 61.

The seat skin 7 is a portion that contacts the occupant at the seat portion and the backrest portion of the seat 1.
FIG. 6 is an explanatory view showing an end structure of the sheet skin in the first embodiment.
As shown in FIG. 6, the sheet skin 7 is sewn so as to provide a bag-like portion 71 that is penetrated and attached so that each frame member of the sheet 1 passes therethrough. For example, the bag-like portion is obtained by folding and sewing a cloth-shaped end portion.
The bolt 8 is a fastening member that fixes the frame member of the seat 1. Although illustration and description of the details of the member portion attached with the bolt 8 are omitted, a corresponding nut may be provided, and the hole portion of the member may be engaged with the tooth surface. In the seat 1 of Example 1, the seat portion and the backrest portion are constituted only by the stretched sheet skin 7. As an example of the material, a highly elastic polyester mesh sheet is taken as an example. In the high-elasticity polyester mesh sheet, an appropriate elasticity is generated by pulling the epidermis and attaching it with a certain amount of tension, and a good appearance without a comfortable sitting or wrinkle is obtained.

Next, a structure for securing the lumbar S-shaped posture in the first embodiment will be described.
In the seat 1, as shown in FIG. 3, the portions constituting the backrests of the left frame 2 and the right frame 3 are curved into an S shape so as to match the lumbar S shape posture of the occupant.
In this curved shape, the upper part of the backrest part has a curved shape that is recessed backward, and the lower part has a curved shape that swells forward.
The position of the rear member 5 is set to a rear position from the lower part of the backrest portions of the left frame 2 and the right frame 3. In other words, that is, the rear position from the rear end of the cushion frame 4. In the seat cover 7, in the backrest portion of the seat 1, the left frame 2 and the right frame 3 penetrate the left and right bag-shaped portions 71, so that the backrest portion curved in an S shape is stretched along the curved shape of the S shape. Configure as follows. Then, by folding back at the rear rear member 5, the seat skin 7 is configured to extend rearward so as to extend the S-curve of the backrest portion downward.

Next, the operation will be described.
[Operation of assembling the sheet and stretching the sheet cover simultaneously]
In addition, it demonstrates along with an one part structure along an assembly order. Reference numeral 201 denotes an arrow for explaining that a tension is applied to the seat skin 7, and reference numeral 202 denotes an arrow indicating a bent portion of the seat skin 7.
FIG. 7 is an explanatory diagram illustrating a state in which the seat skin is attached to the frame member in the first embodiment.
When assembling the vehicle seat of the first embodiment, first, the seat skin 7 is attached so that the left frame 2, the right frame 3, and the cushion frame 4 penetrate the bag-like portion 71 of the seat skin 7 (FIG. 7). In this state, the seat skin 7 is stretched only at the front end portion of the cushion frame 4 and the rest is bent without tension.
FIG. 8 is an explanatory diagram of an intermediate state of assembly of the left frame and the right frame in the first embodiment. FIG. 9 is an explanatory diagram of a state in which the cushion frame 4 is attached to the left frame 2 and the right frame 3 in the first embodiment.

If the seat skin 7 is attached to each frame member, then, the lower end portion 32 of the right frame 3 is inserted into the lower end portion 22 of the left frame 2, and the upper end portion 31 of the right frame 3 is inserted into the upper end portion 21 of the left frame 2. Plug in. In this state, the left-right distance (sheet width) between the left frame 2 and the right frame 3 is shorter than the left-right distance of the seat 1 depending on the insertion depth. This insertion is easily performed with a small force because the sheet skin 7 is in a free state. This state is set as an assembly intermediate state (see FIG. 8).
The cushion frame 4 is attached to the left frame 2 and the right frame 3 in this state. In that case, first, the lower end portions 22 and 32 of the left frame 2 and the right frame 3 are fastened with bolts 8 to the front end portions which are long on the left and right sides of the cushion frame 4. By this fastening, the left and right intervals of the lower end portions 22 and 32 become the left and right intervals of the sheet 1. Then, both ends of the cushion frame 4 are fastened with bolts to the intermediate backrest portions of the left frame 2 and the right frame 3 (see FIG. 9).

  In the state shown in FIG. 9, the seat skin 7 is stretched at the front portion of the cushion frame 4 that is the front portion of the seat portion of the seat 1, but the upper end portions 21 and 31 of the left frame 2 and the right frame 3. Is shorter than the left-right distance of the seat 1, so that the rear portion of the seat portion is in a slack state. In this fastening, only the lower end portions 22 and 32 of the left frame 2 and the right frame 3 which are already inserted are expanded and fastened to the cushion frame 4 where the front portion of the seat portion of the seat 1 is already formed. In addition, since the lower end portions 22 and 32 are not subjected to tension or the like, it is easily performed with a small force.

FIG. 10 is an explanatory diagram of a state in which the rear member 5 is attached to the left frame 2 and the right frame 3 in the first embodiment.
If the cushion frame 4 is attached to the left frame 2 and the right frame 3, then the rear member 5 is attached. The rear member 5 presses the front side of the seat cover 7 so that the seat cover 7 is folded back from the seat portion to the backrest portion at an angle close to 90 degrees. Then, both ends are fastened to the left frame 2 and the right frame 3 with bolts 8 (see FIG. 10). In this state, the left-right distance between the rear part of the seat part of the seat 1 and the lower end part of the backrest part is substantially the left-right distance of the seat 1. For this reason, the left and right directions of the seat portion of the seat 1 and the lower end portion of the backrest portion of the seat cover 7 are tensioned and almost stretched.

In the upper backrest portion, the upper end portions 21 and 31 of the left frame 2 and the right frame 3 are made shorter than the left and right intervals of the seat 1, thereby causing the seat skin 7 to bend. Further, although tension is applied in the front-rear direction of the seat portion of the seat 1 and the vertical direction of the backrest portion, the upper end portions 21, 31 of the left frame 2 and the right frame 3 are made shorter than the left-right distance of the seat 1, It will be in the state which produced a little bending.
When the rear member 5 is attached by fastening, the upper ends 21 and 31 of the left frame 2 and the right frame 3 are in a free state, and both ends of the cushion frame 4 are bent so as to open and close a U-shape. Therefore, the attachment can be easily performed with a small force.

FIG. 11 is an explanatory diagram of a state in which the headrest 6 is attached to the left frame 2 and the right frame 3 in the first embodiment.
If the rear member 5 is attached to the left frame 2 and the right frame 3, the headrest 6 is finally attached to the left frame 2 and the right frame 3. At that time, the upper ends 21 and 31 of the left frame 2 and the right frame 3 are inserted into the inside from the lower opening of the attachment portion 62 of the headrest 6. And the left-right space | interval of the upper end parts 21 and 31 is made into the position used as the upper end part of the backrest part of the sheet | seat 1, and it fastens to the attaching part 62 of the headrest 6 with the volt | bolt 8 (refer FIG. 11). That is, it fastens with the headrest 6 so that the space | interval of the left frame 2 and the right frame 3 may be expanded so that it may become a predetermined space | interval.

Then, since the upper end portion of the seat back portion is the left-right distance of the seat 1, the entire left frame 2 and right frame 3 have a predetermined left-right distance, and the cushion frame 4 fastened to the left frame 2 and the right frame 3 Both ends are also the left and right intervals of the predetermined sheet 1.
As a result, a sufficient tension is applied to the entire left / right direction of the backrest portion of the seat 1 in the seat covering 7 to be in a predetermined tension state. In addition, sufficient tension is applied in the left-right direction of the entire seat portion of the seat cover 7 to be in a predetermined tension state.

Further, when the upper end portion of the seat back portion becomes the left-right distance of the seat 1, the upper end positions of the left frame 2 and the right frame 3 are fixed without bending. Even in the longitudinal direction, sufficient tension is applied and a predetermined tension is obtained.
Thus, the assembly of the seat 1 is completed by the attachment of the headrest 6. At the same time, the sheet skin 7 is completely stretched with a predetermined tension.
Since the headrest 6 is attached to the left frame 2 and the right frame 3 at positions away from both end positions of the cushion frame 4 that is the lower fastening portion, the left frame 2 and the right frame 3 are attached. Because of the bending of the pipe, it can be easily installed with a small moment. As described above, the assembly of the sheet 1 of the first embodiment is easily performed with a small force.

In Example 1, in order to clarify the action of simultaneously assembling the sheet and stretching the sheet skin, the following description is added.
FIG. 12 is an explanatory diagram of a conventional seat skin mounting structure.
In Japanese Patent Laid-Open No. 2006-280548, in order to make the seat cover in the form of a single piece of cloth and have a tension, as shown in FIG. A structure that is tightened and tensioned is disclosed.
However, if the structure is provided with a seat skin attachment member, the number of parts and weight increase, and the structure becomes complicated. The complicated structure makes the tension unstable. Further, the conventional structure as shown in FIG. 12 requires the seat frame to be formed by welding, and requires three processes such as seat frame welding, assembly, and seat covering.

  On the other hand, in Example 1, when the assembly of the sheet 1 is completed, the sheet covering is completed at the same time, which is advantageous in terms of the number of parts, the weight, and the complexity of the structure. In addition, a separate sheet covering process is not required, and the simplification of the structure is advantageous in that the tension of the sheet covering is stabilized.

[Action to prevent deterioration of strength and accuracy due to welding]
In the seat 1 according to the first embodiment, the frame structure is divided into a left frame 2, a right frame 3, a cushion frame 4, a rear member 5, and a headrest 6, which are fixed by mechanical fastening, that is, fastening. Further, the seat skin 7 has a structure in which tension is applied at the same time when assembling with each frame. Therefore, the sheet 1 can be assembled without any welded part only by mechanical fastening. This prevents a decrease in strength due to welding and a decrease in accuracy due to welding distortion.

[Action to secure lumbar S-shaped posture]
In the seat 1 of the first embodiment, the seat epidermis 7 constituting the backrest portion of the seat 1 by considering the bending of the left frame 2 and the right frame 3 and the folding back at the rear position by the rear member 5 takes the lumbar S-shaped posture into consideration. It is stretched over in a curved shape.
Therefore, the sitting comfort of the occupant using the seat 1 is improved. In other words, when weight reduction is particularly important as in an electric vehicle, the seat 1 according to the first embodiment configures the seat portion and the backrest portion of the seat with the single sheet skin 7 while realizing weight reduction. The seating comfort is improved by making the shape into consideration the lumbar S-shaped posture.

Next, the effect will be described. In the vehicle seat of the first embodiment, the effects listed below can be obtained.
(1) The outer frame of the leg part and the backrest part of the seat 1 is divided into left and right parts, and the left frame 2 and the right frame 3 each formed by a single bending pipe, and the outer frame of the seat part of the seat 1 A cushion frame 4 formed of a bent pipe, and a bag-like member that is provided as a single cloth member that forms the backrest and seat of the seat 1 and allows the left frame 2, the right frame 3, and the cushion frame 4 to pass through the periphery. A seat skin 7 having a portion 71, a rear member 5 formed of a bending pipe, which folds the seat skin 7 back into a seat portion and a backrest portion, and bolts 8 for fixing each frame member, Since the bending pipe which is each frame member is penetrated to the portion 71 and is structured to be fastened by the bolt 8, each frame is attached to the seat skin 7 without welding. Assembled by mechanical fastening by fastening each frame formed by type member with a bolt 8, decrease in strength due to welding, loss of accuracy due to welding distortion can be prevented.

  (2) The upper ends of the left frame 2 and the right frame 3 are connected to each other, and a headrest 6 serving as a head portion of the backrest portion is provided. The left frame 2 and the right frame 3 are attached to the left frame 2 with the seat skin 7 attached. The upper end portion 21 and the lower end portion 22 of the right frame 3 are enlarged, the upper end portion 31 and the lower end portion 32 of the right frame 3 are inserted, and the left and right widths of the seat 1 are short and the left and right split structures are formed into a shape in an intermediate state. One end on the side of the seat is the mounting position of the seat frame by the bolt 8 to the cushion frame 4, the lower part of the backrest is the mounting position of the seat 8 by the bolt left and right width to the rear member 5, and the upper end is attached to the headrest 6. The mounting position of the left and right seats with the bolts 8 is set, and the cushion frame 4 is mounted at both ends of the bending pipe with the bolts 8 attached to the left frame 2 and the right frame 3. In order to allow the deflection of the distance between the both ends in the state, the shape connected to the backrest is the both ends, so that the left frame 2 and the right frame 3 Since each part has a predetermined left and right width, the seat skin 7 whose peripheral edge is attached to each frame in an intermediate state of assembly can be in a state of being tensioned with a predetermined tension, and can be easily assembled with a small force. Thus, the work process can be omitted.

  (3) The left frame 2 and the right frame 3 have the back portion of the bending pipe curved into a lumbar sigmoid shape, and the folding position of the seat skin 7 by the rear member 5 is changed to the lumbar sigmoid shape of the left frame 2 and the right frame 3. Since it is in the extended position of the curve, it is possible to improve the sitting comfort by making the shape considering the lumbar S-shaped posture while reducing the weight.

  As mentioned above, although the vehicle seat of the present invention has been described based on the first embodiment, the specific configuration is not limited to these embodiments, and the gist of the invention according to each claim of the claims. As long as they do not deviate, design changes and additions are permitted.

For example, in the first embodiment, the structure in which the bolts 8 are fastened is shown. However, other mechanical fastening such as rivets and screws may be used.
For example, in the first embodiment, as the left and right divided structures that are in the assembled intermediate state in which the left and right widths of the seat are short, the upper end 21 and the lower end 22 of the left frame 2 are expanded in diameter, and the upper end of the right frame 3 is increased. 31 and the lower end 32 are inserted, but the left and right center of the sheet may be omitted and the structure may be divided into left and right.
Further, for example, in Example 1, a bag-shaped portion that penetrated as a mounting hole for allowing the frame member to pass through the seat cover was formed, but in other shapes such as a mounting hole provided so as to make a cut in the seat cover. It may be present, and it is desirable to be attached to each frame member before the frame member is assembled.

  The present invention can be used for a sheet installed on another moving body or the like.

DESCRIPTION OF SYMBOLS 1 Seat 2 Left frame 21 Upper end part 22 Lower end part 3 Right frame 31 Upper end part 32 Lower end part 4 Cushion frame 5 Rear member 6 Headrest 61 Frame part 62 Attachment part 63 Reinforcement member 7 Seat skin 71 Bag-like part 8 Bolt
101 electric car
201 (Indicates the part of the sheet skin where the tension is applied)
202 (Indicates the bent part of the sheet skin)

Claims (2)

The left and right frames in which the outer frame of the seat leg and backrest is divided into left and right, each formed by a single bent pipe,
A cushion frame in which the outer frame of the seat portion of the seat is formed of a single bent pipe;
A seat cover that is provided as a single cloth member that forms the seat back and seat, and has a mounting hole that allows the right and left frames and the cushion frame to pass through the periphery;
A rear member that is formed of a bending pipe and folds the seat skin into a seat portion and a backrest portion;
Mechanical fastening means for securing each frame member;
With
Attached so as to penetrate the sheet bending a respective frame member to the mounting hole pipe epidermis, in the vehicle dual sheets to the structure for mechanically fastening,
Connecting the upper ends of the left and right frames, comprising a headrest that becomes the head portion of the backrest;
The left and right frames have a left and right split structure in which the seat skin is attached and the left and right widths of the seat are in an assembled state with a short width, and one end on the leg side is the mechanical fastening means to the cushion frame. The seat left and right width of the seat, and the lower part of the backrest portion is the seat left and right mounting position by the mechanical fastening means to the rear member, and the upper end is the seat left and right width of the mechanical fastening means to the headrest. Mounting position,
The cushion frame is configured so that both ends of the bending pipe are attached to the left and right frames by the mechanical fastening means, and the backrest portion is allowed to allow bending of the distance between both ends in the intermediate state of assembly. A vehicle seat characterized in that the connecting portions have both ends . The vehicle seat according to claim 1,
The left and right frames bend the back portion of the bending pipe into a lumbar S-shape,
A vehicle seat, wherein the folding position of the seat skin by the rear member is an extended position of the lumbar S-shaped curve of the left and right frames .

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