JP6831680B2 - Vehicle seat cushion - Google Patents

Description

The present invention relates to a seat cushion for a vehicle seat that can improve the seating feeling of a occupant.

As an example of the seat cushion of the vehicle seat, there are those shown in FIGS. 3 and 4.
The seat cushion Se shown in these figures includes a cushion frame 1 and a plurality of cushion springs 2e, and a cushion pad 3 is mounted on the upper side of the cushion frame 1. The cushion spring 2e is an S spring (zigzag spring), and is bridged between the front and rear frame portions 11 and 12 of the cushion frame 1 and extends in the front-rear direction. As shown in FIG. 4, the rear frame portion 12 includes the bottom wall portion 12a in addition to the bottom wall portion 12a located below the rear pipe 5 constituting the link mechanism (not shown) for raising and lowering the seat cushion Se. The front wall portion 12d and the rear wall portion 12b have a cross-sectional shape that rises upward from the front end and the rear end of the vehicle, and the strength against the load input in the vehicle width direction at the time of a side collision of the vehicle is improved.

The front end portion 20 of the cushion spring 2e is connected to the front frame portion 11, while the rear end portion 21 is engaged with the hook-shaped spring locking portion 60 of the bracket 6 welded to the rear frame portion 12. It has been stopped. The bracket 6 is formed separately from the rear frame portion 12, because it is difficult to integrally provide the portion corresponding to the bracket 6 on the rear frame portion 12 by press molding.
According to the above configuration, since the cushion pad 3 is supported by the cushion spring 2e, it is possible to improve the cushioning property.

However, in the above-mentioned seat cushion Se, there is still room for improvement as described below.

First, when the occupant 8 is seated on the vehicle seat, the largest load (body weight) is likely to act directly under the hip point H of the occupant 8. On the other hand, the cushion spring 2e does not correspond to such a load distribution, and the repulsive force of the cushion spring 2e generated when the occupant sits on the hip point H of the occupant 8 with respect to the buttock portion of the occupant 8. It may act stronger than other parts. For this reason, there is still room for improvement in improving the sitting comfort.
Secondly, as a means for supporting the rear end portion 21 of the cushion spring 2e, a bracket 6 having a relatively high height is used, and the bracket 6 is located directly below the buttocks of the occupant 8. , There is a risk of giving a foreign body sensation to the occupant 8.
Thirdly, since the means for joining the bracket 6 to the rear frame portion 12 is adopted, the number of parts and the number of manufacturing processes are increased. As a result, the manufacturing cost is high.

As another conventional example of the seat cushion, there is one described in Patent Document 1. In the document described in the same document, the positional relationship between the position of the occupant's hip point and the plurality of cushion springs is defined to improve the sitting comfort. However, in the seat cushion described in the same document, a plurality of cushion springs are arranged so as to be arranged at intervals in the front-rear direction and each of them extends in the width direction (orthogonal to the cushion spring 2e in FIG. 3). Orientation). On the other hand, when the occupant sits on the seat cushion, the thigh portion extends forward from the buttocks. Therefore, according to the structure described in Patent Document 1, the repulsive forces of the plurality of cushion springs act on the buttocks and thighs of the occupant in a discontinuous state at intervals in the front-rear direction. This may give the occupant a sense of discomfort.

Japanese Unexamined Patent Publication No. 2016-179234

The present invention has been conceived under the above-mentioned circumstances, and is for a vehicle which can improve the sitting comfort as compared with the conventional case and can appropriately reduce the manufacturing cost. The challenge is to provide seat cushions for the seats.

In order to solve the above problems, the following technical measures are taken in the present invention.

The seat cushion of the vehicle seat provided by the present invention is located between the front portions and the rear portions of a pair of left and right side frame portions extending in the front-rear direction at intervals in the width direction and extends in the width direction. A cushion frame having a front frame portion and a rear frame portion and a cushion pad mounted on the upper surface portion, and a cushion frame extending between the front frame portion and the rear frame portion and extending in the front-rear direction. It is a seat cushion of a vehicle seat including a cushion spring arranged under the cushion pad, and the rear frame portion is upward from the bottom wall portion and the rear portion of the bottom wall portion. It has a raised rear wall portion, and the rear end portion of the cushion spring is supported on the upper portion of the rear wall portion, and the cushion spring is a three-dimensional mannequin of JIS D4607 or US SAE J-826. The position directly below the hip point is the lowest height part, and the front side adjacent area of this minimum height part is the front rising slope area, and the rear side adjacent area is the back rising slope area. It is characterized by being said to be.

According to such a configuration, the following effects can be obtained.
First, the cushion spring has a minimum height at the position directly below the hip point of an occupant with a standard physique as defined by JIS or SAE in the United States or a physique close to this, and the front side thereof and the cushion spring. On the rear side, a front rising slope region and a rear rising slope region are adjacent to each other. For this reason, the load distribution acting on the cushion spring from the occupant and the height of each part of the cushion spring are in a relationship that accurately corresponds to each other, and the repulsive force from the cushion spring is applied to the hip point of the occupant, such as the buttocks of the occupant. It does not act stronger than other parts, and it is possible to equalize the repulsive force of the cushion spring that acts on various parts such as the buttocks and the base of the thigh of the occupant. As a result, it becomes possible to improve the sitting comfort of the vehicle seat as compared with the conventional case.
Second, the conventional bracket for supporting the rear end portion of the cushion spring is not required, and instead of this bracket, a part of the cushion spring can be arranged below the buttocks of the occupant. For this reason, it is possible to eliminate the problem of giving a foreign body sensation to the occupant due to the presence of the bracket, and the total length of the cushion spring is made longer than before, and the elastic force of the cushion spring covers a wide range of the occupant's buttocks. Can work effectively. Therefore, it is possible to further improve the sitting comfort.
Thirdly, since the conventional bracket described above can be eliminated, the number of parts of the vehicle seat and the manufacturing process can be reduced, and the manufacturing cost can be reduced.
Fourth, since the cushion spring is provided so as to extend in the front-rear direction, it is possible to prevent the discomfort as described in Patent Document 1 from occurring.

Other features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings.

It is a main part perspective view which shows an example of the seat cushion of the vehicle seat which concerns on this invention. FIG. 2 is a schematic cross-sectional view taken along the line II-II of FIG. It is a main part perspective view which shows an example of the prior art. FIG. 3 is a schematic cross-sectional view of IV-IV of FIG.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
In order to facilitate understanding, the same or similar elements as those in the prior art shown in FIGS. 3 and 4 are designated by the same reference numerals as those in the prior art, and duplicate description will be omitted as appropriate.

The seat cushion S of the vehicle seat shown in FIGS. 1 and 2 is for the front seat of an automobile, and is mounted on a cushion frame 1, a plurality of cushion springs 2, and above them, which are formed in a substantially rectangular frame shape in a plan view. It includes a cushion pad 3 (shown by a virtual line in FIG. 2) to be provided, and a skin material (not shown) that covers the cushion pad 3.

The cushion frame 1 is made of metal, is located at intervals in the left and right width directions, and has a pair of side frame portions 10 extending in the front-rear direction, and the front portions and rear portions of the pair of side frame portions 10. The front and rear frame portions 11 and 12 that connect each other and extend in the width direction are provided. The cushion frame 1 is mounted on a seat rail 4 laid on the floor of the vehicle interior. The seat rail 4 includes a lower rail 40 and an upper rail 41 slidably fitted to the lower rail 40. Since the side frame portion 10 is supported on the upper rail 41, the position of the seat cushion S can be adjusted in the front-rear direction.

A rear side pipe 5 to which a link arm 50 is continuously provided is horizontally erected at the rear portion of the pair of side frame portions 10. Similarly, on the front portion of the pair of side frame portions 10, a front side pipe 5a to which a link arm 50a is continuously provided is horizontally erected. The cushion frame 1 can be raised and lowered by using an elevating mechanism (not shown) using the link arms 50, 50a and the like, and the seat height of the vehicle seat can be adjusted.

The cushion spring 2 is an S spring (“3810 zigzag spring” in JIS B0103 or a spring similar thereto), and has a structure in which a metal wire for a spring is formed in a meandering shape in a plan view. The cushion spring 2 is attached to the cushion frame 1 in a direction extending in the front-rear direction. More specifically, the front end portion 20 of the cushion spring 2 is locked to the spring locking portion 11a formed on the front frame portion 11. The spring locking portion 11a has a stepped shape in which a part of the front frame portion 11 is projected upward, and a pair of openings 11b are formed on both left and right side surfaces thereof. By inserting the front end portion 20 of the cushion spring 2 through the pair of openings 11b in a series, the front end portion 20 is locked to the spring locking portion 11a.

The rear end portion 21 of the cushion spring 2 is locked to the spring locking portion 12c provided on the rear frame portion 12. The rear frame portion 12 stands up from the bottom wall portion 12a located below the rear pipe 5 and the rear portion of the bottom wall portion 12a in an upwardly curved shape, and is located behind the rear pipe 5. A wall portion 12b is provided, and a spring locking portion 12c is provided on the upper edge portion of the rear wall portion 12b. The spring locking portion 12c is, for example, a hook-shaped protrusion.

The cushion spring 2 has a bent side view, and in the front-rear direction, it is a three-dimensional mannequin of JIS D4607 (three-dimensional sitting human body model for measuring vehicle interior dimensions (3DM-JM 50)) or three-dimensional of SAE J-826 in the United States. The position directly below the hip point H of the mannequin is the lowest height portion 2a having the lowest height.
The front-side adjacent region of the minimum height portion 2a is defined as a front-up tilt region 2b having an appropriate tilt angle α. In the present embodiment, of the cushion spring 2, substantially the entire area located on the front side of the minimum height portion 2a is the forward rising inclined region 2b. On the other hand, the rear adjacent region of the minimum height portion 2a is set as the rearward tilt region 2c having an appropriate tilt angle β. The inclination angles α and β are, for example, α <β, but are not limited to this. An additional region 2d in an inclined state different from the rear rising inclined region 2c is formed in the region between the rear rising inclined region 2c and the spring locking portion 12c. In the present embodiment, the additional region 2d is substantially horizontal, but is not limited to this, and may be a rearward slope or a rearward slope.

Next, the operation of the seat cushion S of the vehicle seat described above will be described.

First, when the occupant 8 is seated, the seat cushion S is likely to receive the largest load at a position directly below the hip point H of the occupant 8. On the other hand, when the occupant 8 has a standard physique as defined by JIS or SAE in the United States, the position directly below the hip point H of the occupant 8 is the minimum height portion 2a of the cushion spring 2. Therefore, the repulsive force of the cushion spring 2 does not act locally strongly from the lowest height portion 2a toward the hip point H portion of the occupant 8. Further, the front rising inclined region 2b and the rear rising tilting region 2c are adjacent to the front side and the rear side of the minimum height portion 2a of the cushion spring 2, and this acts on the cushion spring 2 from the occupant 8. The load distribution and the height of each part of the cushion spring 2 accurately correspond to each other. As a result, it is possible to equalize the repulsive force of the cushion spring 2 acting on each part such as the buttocks and the base of the thigh from the cushion spring 2, and it is possible to improve the sitting comfort of the occupant 8. ..

In the seat cushion S, the bracket 6 shown in FIG. 4 is not used, and a part of the cushion spring 2 is present above the portion where the bracket 6 is provided. Therefore, not only can the foreign body sensation that occurs when the bracket 6 is used be eliminated, but also a wide range of load on the buttocks of the occupant 8 can be received by the cushion spring 2. Therefore, it is possible to further improve the sitting comfort. Of course, by not using the bracket 6, the number of parts of the seat cushion S and the manufacturing process can be reduced, and the manufacturing cost can be reduced.

The present invention is not limited to the contents of the above-described embodiments. The specific configuration of each part of the seat cushion of the vehicle seat according to the present invention can be variously redesigned within the range intended by the present invention.

In the cushion spring 2 shown in FIG. 2, the intersection of the front rising inclined region 2b and the rear rising tilt region 2c is the minimum height portion 2a, and the width dimension of the minimum height portion 2a in the front-rear direction is Although it is almost zero, the present invention is not limited to this. The minimum height portion 2a may be configured as a portion having a slight width in the front-rear direction. As the cushion spring, it is also possible to use a spring other than the S spring. Further, the specific method of attaching the cushion spring to the cushion frame is not limited.
The present invention can be applied not only to the front seats of a vehicle but also to the seat cushions for the rear seats. Therefore, the specific shape of the cushion frame and the like can be different from those of the above-described embodiment.

S Seat cushion H Hip point 1 Cushion frame 10 Side frame part 11 Front frame part 12 Rear frame part 2 Cushion spring 2a Minimum height part 2b Front rising slope area 2c Back rising slope area 3 Cushion pad

Claims (1)

It has a front frame part and a rear frame part that extend in the width direction and are located between the front parts and the rear parts of a pair of left and right side frame parts that extend in the front-rear direction with an interval in the width direction, respectively, and an upper surface part. A cushion frame on which a cushion pad is placed and
A cushion spring that is bridged between the front frame portion and the rear frame portion, extends in the front-rear direction, and is arranged under the cushion pad.
Is a seat cushion for vehicle seats
The rear frame portion has a bottom wall portion and a rear wall portion that rises upward from the rear portion of the bottom wall portion, and the rear end portion of the cushion spring is supported on the upper portion of the rear wall portion. ,
The cushion spring is the lowest height portion where the height is the lowest immediately below the hip point of the JIS D4607 or the US SAE J-826 three-dimensional mannequin, and the front adjacent region of this minimum height portion is the front. A seat cushion for a vehicle seat, characterized in that the area adjacent to the rear side is a rearward slope area as well as an upward slope area.

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