JP6879818B2 - Cushion pans and vehicle seats - Google Patents

Description

The present invention relates to cushion pans and vehicle seats.

Patent Document 1 below describes a seat pad support (cushion pan) that is integrally molded entirely of a long glass fiber reinforced polypropylene molding material. The seat pad support is formed with notch grooves facing each other, and the region sandwiched by both notch grooves is a vertical swing portion. Flexible portions having a substantially U-shaped cross section or a substantially W-shaped cross section are formed at both ends of the vertical swing portion, and when the load of the occupant is applied downward, both flexible portions are formed. By bending, the vertical swinging portion swings downward. This improves the ride quality of the seated person. It is said that the seat pad support may be integrally molded by press molding using, for example, a metal plate such as spring steel.

Japanese Unexamined Patent Publication No. 11-75984

However, when the seat pad support having the above configuration is press-molded using a metal plate such as spring steel, the cross-sectional coefficient of the flexible portion increases, so that the flexible portion hardly bends. Further, the moldability when the flexible portion is press-molded into a substantially U-shaped cross section or a substantially W-shaped cross section is deteriorated. In particular, when the metal plate is made of spring steel or the like, it is difficult to press-mold the flexible portion into the above-mentioned cross-sectional shape, which complicates the production.

In consideration of the above facts, an object of the present invention is to obtain a cushion pan that can be easily manufactured and a vehicle seat provided with the cushion pan, while ensuring a good ride quality for the seated person.

The cushion pan according to the invention according to claim 1 is provided on a seat cushion, has a bottom wall portion that supports the cushion pad from the lower side of the seat, and has a disc spring portion that bulges like a disc spring toward the upper side of the seat. The disc spring portion is provided on the bottom wall portion, and the disc spring portion is formed so that the central portion is located below the hip point of the seated person seated on the seat cushion .

In the cushion pan according to claim 1, a disc spring portion that bulges like a disc spring toward the upper side of the seat is provided on the bottom wall portion that supports the cushion pad of the seat cushion from the lower side of the seat. By bending (deflecting) the disc spring portion, it is possible to ensure a good ride quality for the seated person. Moreover, when manufacturing this cushion pan, for example, a part of the bottom wall portion may be press-molded into a disc spring shape (substantially conical shape), and a flexible portion having a substantially U-shaped cross section or a substantially W-shaped cross section. There is no need to mold. Therefore, it is easy to manufacture.

The cushion pan according to the second aspect of the present invention is the cushion pan according to the first aspect, wherein the general portion of the bottom wall portion provided around the disc spring portion and the disc spring portion are integrally formed. It is formed.

In the cushion pan according to claim 2, the general portion of the bottom wall portion and the disc spring portion are integrally formed. As a result, the number of parts can be reduced as compared with the configuration in which the general portion of the bottom wall portion and the disc spring portion are formed and joined separately, so that the management of parts becomes easy.

The cushion pan according to the third aspect of the present invention is the cushion pan according to the first aspect, wherein the general portion of the bottom wall portion provided around the disc spring portion and the disc spring portion are coupled. ing.

In the cushion pan according to claim 3, since the general portion of the bottom wall portion and the disc spring portion are combined, for example, quenching or the like can be performed only on the disc spring portion molded separately from the general portion. This facilitates adjustment of the spring characteristics of the disc spring portion.

The cushion pan according to the invention according to claim 4 is the cushion pan according to any one of claims 1 to 3, wherein the disc spring portion has a central hole formed in the central portion and the center thereof. It has a large number of radial slits extending radially from the hole.

According to the cushion pan according to claim 4, the disc spring portion is formed with a central hole and a large number of radial slits extending radially from the central hole. Therefore, when a load is applied to the disc spring portion from the upper side of the seat, the diameter of the central portion side of the disc spring portion is reduced, and the flexibility of the disc spring portion is ensured. In this disc spring portion, the cushion pad is also supported by a portion between a large number of radial slits. Therefore, for example, a circular and large-diameter hole is formed on the central portion side (central portion) of the disc spring portion. The cushion pad can be better supported as compared with the above.

The cushion pan according to the invention according to claim 5 is the cushion pan according to any one of claims 1 to 4, wherein the portion of the bottom wall portion adjacent to the disc spring portion is locally located. It is said to be a vulnerable part.

According to the cushion pan according to claim 5, since the portion of the bottom wall portion adjacent to the disc spring portion is a fragile portion, when a load is applied to the disc spring portion from the upper side of the seat, the portion is fragile. The outer circumference of the disc spring portion is easily expanded, and the disc spring portion is easily bent.

The cushion pan according to the invention according to claim 6 is the cushion pan according to claim 5, wherein a large number of circumferential slits extending in the circumferential direction of the disc spring portion are lined up in the circumferential direction in the fragile portion. It is formed.

According to the cushion pan according to claim 6, a large number of circumferential slits extending in the circumferential direction of the disc spring portion are formed side by side in the circumferential direction of the disc spring portion in the fragile portion adjacent to the disc spring portion. .. As a result, the vulnerable part can be vulnerable with a simple configuration.

The cushion pan according to the invention according to claim 7 is the cushion pan according to claim 5, wherein a large number of fragile holes arranged in the circumferential direction and the radial direction of the disc spring portion are formed in the fragile portion. ing.

According to the cushion pan according to claim 7, a large number of fragile holes arranged in the circumferential direction and the radial direction of the disc spring portion are formed in the fragile portion adjacent to the disc spring portion. As a result, the vulnerable part can be vulnerable with a simple configuration. Further, not only the disc spring portion but also the fragile portion is easily bent, so that the riding comfort of the seated person can be further improved.

The cushion pan according to the invention according to claim 8 is provided on the outer peripheral portion of the disc spring portion in the cushion pan according to any one of claims 1 to 4, around the disc spring portion. A step portion is formed between the bottom wall portion and the general portion, and the disc spring portion projects stepwise from the general portion toward the upper side of the seat.

According to the cushion pan according to claim 8, a step portion is formed between the general portion of the bottom wall portion and the disc spring portion, and the disc spring portion projects stepwise from the general portion toward the upper side of the seat. .. Therefore, when a load is applied to the disc spring portion from the upper side of the seat, the outer circumference of the disc spring portion tends to expand, and the disc spring portion tends to bend.

The cushion pan according to the invention according to claim 9 is the cushion pan according to any one of claims 1 to 4, wherein a large number of the disc spring portions are arranged in the circumferential direction of the disc spring portion. A weakening hole is formed.

In the cushion pan according to claim 9, since the disc spring portion is easily bent by forming the large number of weakened holes in the disc spring portion, the riding comfort of the seated person can be further improved.

The cushion pan according to the invention according to claim 10 is the cushion pan according to any one of claims 1 to 4, wherein the disc spring portion is a bottom provided around the disc spring portion. It is formed thinner than the general part of the wall part.

According to the cushion pan according to claim 10, the disc spring portion is formed thinner than the general portion of the bottom wall portion. As a result, the disc spring portion is easily bent, so that the riding comfort of the seated person can be further improved.
The cushion pan according to claim 11 is provided on the seat cushion and has a bottom wall portion that supports the cushion pad from the lower side of the seat, and the disc spring portion that bulges like a disc spring toward the upper side of the seat is the bottom wall. The disc spring portion provided in the portion has a central hole formed in the central portion and a large number of radial slits extending radially from the central hole.
The cushion pan according to claim 12 is provided on the seat cushion and has a bottom wall portion that supports the cushion pad from the lower side of the seat, and the disc spring portion that bulges like a disc spring toward the upper side of the seat is the bottom wall. The portion of the bottom wall portion adjacent to the disc spring portion, which is provided in the portion, is a locally fragile portion.
The cushion pan according to claim 13 is the cushion pan according to claim 12, wherein a large number of circumferential slits extending in the circumferential direction of the disc spring portion are formed side by side in the circumferential direction in the fragile portion. There is.
The cushion pan according to claim 14 is the cushion pan according to claim 12, wherein a large number of fragile holes arranged in the circumferential direction and the radial direction of the disc spring portion are formed in the fragile portion.

Vehicle seat according to the invention of claim 1 5, cushion according to any one of claims 1 to 1 4, the cushion pad and the cushion pad supported from the seat lower side by the bottom wall portion It has a seat cushion with a pan.

In the vehicle seat according to claim 15 , the cushion pad of the seat cushion is supported from the lower side of the seat by the bottom wall portion of the cushion pan. Since this cushion pan is the one according to any one of claims 1 to 10, it exerts the above-mentioned action and effect.

The vehicle seat according to the invention according to claim 16 is formed in a plate shape by a material harder than the cushion pad in the vehicle seat according to claim 15, and the cushion pad and the disc spring portion. It has a hard plate placed between and.

In the vehicle seat according to claim 16 , a hard plate formed in a plate shape made of a material harder than the cushion pad is arranged between the disc spring portion of the cushion pan and the cushion pad. As a result, the weight of the seated person is not dispersed and is easily concentrated on the disc spring portion, so that the disc spring portion is likely to exhibit the characteristics of the disc spring.

As described above, the cushion pan and the vehicle seat according to the present invention can ensure a good ride quality for the seated person and facilitate the manufacture.

It is a perspective view which shows the frame of the vehicle seat which concerns on 1st Embodiment of this invention. It is an exploded perspective view corresponding to FIG. 1 which shows the state which the cushion pan of the vehicle seat which concerns on 1st Embodiment is removed from the left and right side frames. It is a side view of the cushion pan which concerns on 1st Embodiment. It is a top view of the cushion pan which concerns on 1st Embodiment. It is a front view of the cushion pan which concerns on 1st Embodiment. FIG. 3B is an enlarged plan view showing a part of FIG. 3B in an enlarged manner. FIG. 5 is an enlarged cross-sectional view showing an enlarged cut surface along the line F5-F5 of FIG. It is sectional drawing which disassembled the component of the seat cushion which concerns on 1st Embodiment, and looked at from the front side of a seat. It is an exploded perspective view for demonstrating the positional relationship between a cushion pan and a hard plate which concerns on 1st Embodiment. It is a diagram which shows the load-deflection curve of the cushion pan which concerns on 1st Embodiment. It is a perspective view which shows the cushion pan which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the cushion pan which concerns on 3rd Embodiment of this invention. It is a perspective view which shows the cushion pan which concerns on 4th Embodiment of this invention. It is a perspective view which shows the cushion pan which concerns on 5th Embodiment of this invention. It is a perspective view which shows the cushion pan which concerns on 6th Embodiment of this invention. It is a perspective view which shows the cushion pan which concerns on 7th Embodiment of this invention. It is the same cross-sectional view as FIG. 5 which shows the cushion pan which concerns on 8th Embodiment of this invention.

<First Embodiment>
Hereinafter, the vehicle seat 10 and the cushion pan 30 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8. The arrows FR, UP, and LH appropriately shown in the drawings indicate the front direction, the upward direction, and the left direction of the vehicle seat 10, respectively. Hereinafter, when the front-rear, left-right, up-down directions are used, the directions based on the vehicle seat 10 are shown unless otherwise specified.

(Overall configuration of vehicle seat 10)
As shown in FIGS. 1 and 2, the vehicle seat 10 according to the present embodiment includes a seat cushion frame 14 forming the skeleton of the seat cushion 12 and a seat back frame 18 forming the skeleton of the seat back 16. There is. First, the outline of the overall configuration of the vehicle seat 10 will be described, and then the main parts of the present embodiment will be described.

The seat cushion frame 14 has a pair of left and right side frames 20 arranged on the left and right side portions of the seat cushion 12, and a cushion pan 30 supported by the left and right side frames 20 from the lower side of the vehicle. The left and right side frames 20 are formed in a long shape by, for example, a metal plate, and are arranged so as to be longitudinal in the front-rear direction of the seat. The cushion pan 30 is formed by press-molding a metal plate (for example, a high-strength steel plate), and is formed in a substantially rectangular shape in a plan view of the sheet. Both ends of the cushion pan 30 in the left-right direction of the seat (in the width direction of the seat) are fixed to the left and right side frames 20 by means such as bolting.

The left and right side frames 20 of the seat cushion frame 14 are connected to the floor of the vehicle body via a pair of left and right slide rails 22. These slide rails 22 form a well-known seat slide mechanism, and the position of the seat cushion frame 14 in the front-rear direction with respect to the vehicle body can be adjusted. A cushion pad 50 made of a foam such as urethane foam (not shown except for FIG. 6) is attached to the upper surface of the cushion pan 30, and the surface of the cushion pad 50 is a cushion skin 52 (not shown except for FIG. 6). ) Is covered.

The seat back frame 18 spans between a pair of left and right side frames 24 extending in the vertical direction (height direction) of the seat back 16 on the left and right side portions of the seat back 16 and the upper ends of the left and right side frames 24. It includes an upper frame (not shown) and a lower frame 26 bridged between the lower ends of the left and right side frames 24. The lower ends of the left and right side frames 24 are connected to the left and right side frames 20 of the seat cushion frame 14 via a well-known reclining mechanism 28. As a result, the seat back frame 18 can adjust the reclining angle with respect to the seat cushion frame 14. A back pad (not shown) made of foam such as urethane foam is attached to the seat back frame 18, and the surface of the back pad is covered with a back skin (not shown).

(Main part of this embodiment)
Next, the configuration of the cushion pan 30 and its surroundings, which are the main parts of the present embodiment, will be described. As shown in FIGS. 1 to 7, the cushion pan 30 is formed in a shallow tray shape (square dish shape) as a whole. The cushion pan 30 is composed of a bottom wall portion 32 formed in a rectangular shape in a plan view and a peripheral wall portion 34 extending from the outer periphery of the bottom wall portion 32 to the upper side of the seat. The upper end of the peripheral wall portion 34 is bent toward the outer periphery of the cushion pan 30. In the cushion pan 30, the bottom wall portion 32 mainly supports the cushion pad 50 (see FIG. 6) from the lower side of the seat.

The bottom wall portion 32 is composed of a general portion 36 and a disc spring portion 38 formed on the slightly rear end side in the central portion of the general portion 36. A front bulging portion 36F, a left bulging portion 36L, and a right bulging portion 36R that bulge upward on the seat are provided at the front end portion, the left end portion, and the right end portion of the general portion 36. Further, a flat portion 36S formed in a flat shape (flat plate shape) is provided at the central portion and the rear end portion of the general portion 36. A disc spring portion 38 is formed in the central portion of the flat portion 36S.

The disc spring portion 38 is formed in a circular shape in a plan view, and bulges from the flat portion 36S toward the upper side of the seat in a disc spring shape (substantially conical shape). The disc spring portion 38 is formed by forming a part of the bottom wall portion 32 into a disc spring shape when the cushion pan 30 is press-molded. The disc spring portion 38 is integrally formed with a general portion 36 (here, a flat portion 36S) provided around the disc spring portion 38. However, the cushion pan 30 has a configuration in which only the disc spring portion 38 is partially hardened after the above press molding. As a result, the springiness of the disc spring portion 38 is improved. After the above press molding, shot peening may be partially applied only to the disc spring portion 38, so that the spring property of the disc spring portion 38 may be improved. The disc spring portion 38 is formed so that the central portion is located below the hip point HP of the occupant P (see FIG. 6; hereinafter referred to as “seat P”) seated on the seat cushion 12.

A central hole 40 and a large number (here, eight) radial slits 42 extending radially from the central hole 40 are formed in and around the central portion of the disc spring portion 38. The center hole 40 and a large number of radial slits 42 penetrate the disc spring portion 38 in the vertical direction of the seat. The center hole 40 is formed in the central portion of the disc spring portion 38, and has a circular shape in a plan view. A large number of radial slits 42 are arranged at equal intervals in the circumferential direction of the disc spring portion 38, and the central hole 40 side has a narrow substantially teardrop shape. A large number of radial slits 42 are connected to the central hole 40. In the disc spring portion 38, the portion between the numerous radial slits 42 is a large number of tongue piece portions 38A extending toward the center of the disc spring portion 38 (reference numerals are omitted except in FIG. 4). The large number of tongue pieces 38A are formed so that the width of the disc spring portion 38 in the circumferential direction becomes narrower toward the tip side, and has a substantially triangular shape in a plan view.

A hard plate 54 (see FIGS. 6 and 7) formed in a plate shape by a material harder than the cushion pad 50 is arranged between the disc spring portion 38 and the cushion pad 50. The hard plate 54 is formed in a disk shape by press felt, expanded polypropylene, polyacetal, or the like, and is attached to the bottom surface of the cushion pad 50 by, for example, integral molding. The hard plate 54 has a diameter equivalent to, for example, the disc spring portion 38, and is arranged concentrically with the disc spring portion 38. When a cloth material made of a non-woven fabric or the like is attached to the bottom surface of the cushion pad 50, the hard plate 54 may be sewn to the cloth material.

The seat cushion 12 provided with the cushion pan 30 having the above configuration has a disc spring portion so that when the load applied from the upper side of the seat is within a specific range, the deflection (displacement) becomes larger than the other ranges. 38 load-deflection characteristics (load-displacement characteristics) are set. Specifically, the load-deflection characteristic of the disc spring portion 38 is set so that the disc spring portion 38 is greatly flexed when the seater P is seated on the seat cushion 12. FIG. 8 shows a load-deflection curve CL1 which is an example of a load-deflection curve (load-displacement curve) of the disc spring portion 38. This load-deflection curve CL1 has an inflection point within the range of the load of 130N to 160N (specifically, around 145N) (see the region A surrounded by the alternate long and short dash line in FIG. 8). The load-deflection curve with such an inflection point is obtained by the characteristics of the disc spring.

Note that FIG. 8 is a computer analysis result. The line L2 shown in FIG. 8 is a load-deflection curve of a conventional general cushion pan, and the line L3 shown in FIG. 8 is a load of a seat cushion frame provided with a spring called an S spring or the like. -It is a deflection curve. The line L4 shown in FIG. 8 is an example of an ideal load-deflection curve of the cushion pan. Since the load-deflection characteristic required for the disc spring portion 38 differs depending on the type of seat cushion, the load-deflection characteristic of the disc spring portion 38 is set and changed for each different type of seat cushion.

(Action and effect)
Next, the operation and effect of this embodiment will be described.

In the vehicle seat 10 having the above configuration, the cushion pad 50 of the seat cushion 12 is supported from the lower side of the seat by the bottom wall portion 32 of the cushion pan 30. The bottom wall portion 32 is provided with a disc spring portion 38 that bulges like a disc spring toward the upper side of the seat. By bending the disc spring portion 38, high vibration absorption is exhibited, so that the riding comfort of the seated person P can be sufficiently ensured. Moreover, when manufacturing the cushion pan 30, for example, a part of the bottom wall portion 32 may be press-molded into a disc spring shape, and it is necessary to form a flexible portion having a substantially U-shaped cross section or a substantially W-shaped cross section. There is no. Therefore, it is easy to manufacture.

Further, in the cushion pan 30, the general portion 36 of the bottom wall portion 32 and the disc spring portion 38 are integrally formed. As a result, the number of parts can be reduced as compared with the configuration in which the general portion 36 and the disc spring portion 38 are formed and joined separately, so that the management of parts becomes easy.

Further, in the present embodiment, the disc spring portion 38 has a central hole 40 formed in the central portion and a large number of radial slits 42 extending radially from the central hole 40. Therefore, when a load is applied to the disc spring portion 38 from the upper side of the seat, the diameter of the central portion side of the disc spring portion 38 is reduced, and the flexibility of the disc spring portion 38 is ensured. In the disc spring portion 38, the cushion pad 50 is also supported by a portion between a large number of radial slits 42 (a large number of tongue pieces 38A), so that, for example, on the central portion side (central portion) of the disc spring portion 38. The cushion pad 50 can be favorably supported as compared with a configuration in which a circular and large-diameter hole is formed.

Further, in the present embodiment, a hard plate 54 formed in a plate shape by a material harder than the cushion pad 50 is arranged between the disc spring portion 38 of the cushion pan 30 and the cushion pad 50. As a result, the weight of the seated person P is not dispersed and is easily concentrated on the disc spring portion 38, so that the disc spring portion 38 is likely to exhibit the characteristics of the disc spring. Moreover, it is possible to prevent the cushion pad 50 from being damaged by interference with the center hole 40 and the radial slit 42.

Further, in the present embodiment, the load-deflection characteristic of the disc spring portion 38 is such that the disc spring portion 38 is greatly flexed in a state where the seated person P is seated on the seat cushion 12 (hereinafter, referred to as “sitting state”). Is set. As a result, the seat cushion 12 is easily bent in the seated state, so that the riding comfort of the seated person P can be further improved.

That is, in the present embodiment, when the buttocks and thighs of the seater P who intends to sit on the seat cushion 12 touch the upper surface of the seat cushion 12, the cushion pad 50 and the disc spring portion 38 begin to bend. As a result, the buttocks and thighs of the seated person P are softly received. After that, in the middle of the stroke in which the disc spring portion 38 bends, the load-deflection curve of the disc spring portion 38 reaches an inflection point. As a result, high vibration absorption is exhibited in the seated state. Further, since the disc spring portion 38 plays a role of the cushion pad 50 a little, the cushion pad 50 can be thinned. Therefore, it also contributes to reducing the size and weight of the seat cushion 12.

Next, other embodiments of the present invention will be described. The same components and operations as those of the first embodiment are designated by the same reference numerals as those of the first embodiment, and the description thereof will be omitted.

<Second embodiment>
FIG. 9 shows a perspective view of the cushion pan 60 according to the second embodiment of the present invention. In this cushion pan 60, the disc spring portion 38 is formed to have a smaller diameter than that of the first embodiment. Further, the central hole 40 is formed to have a larger diameter than that of the first embodiment, and the area occupied by the central hole 40 and a large number of radial slits 42 in the disc spring portion 38 is widened. Other configurations are the same as those in the first embodiment. In this embodiment as well, basically the same effects as those in the first embodiment can be obtained.

<Third embodiment>
FIG. 10 shows a perspective view of the cushion pan 70 according to the third embodiment of the present invention. The cushion pan 70 is similar to the cushion pan 60 according to the second embodiment, but is a portion of the bottom wall portion 32 adjacent to the disc spring portion 38, that is, a portion of the general portion 36 adjacent to the disc spring portion 38. However, it is said that the vulnerable part 72 is locally vulnerable. Specifically, a large number of circumferential slits 74 extending in the circumferential direction of the disc spring portion 38 are formed in the fragile portion 72 side by side in the circumferential direction of the disc spring portion 38. In this embodiment, the configurations other than the above are the same as those in the second embodiment.

In this embodiment as well, basically the same effects as those in the first embodiment can be obtained. Moreover, in this embodiment, since the portion of the bottom wall portion 32 adjacent to the disc spring portion 38 is the fragile portion 72, the disc is prepared when a load is applied to the disc spring portion 38 from the upper side of the seat. The outer circumference of the spring portion 38 is easily expanded, and the disc spring portion 38 is easily bent. Therefore, the ride quality of the seated person P can be further improved. Further, since the fragile portion 72 has a configuration in which a large number of circumferential slits 74 are formed, the fragile portion 72 can be vulnerable with a simple configuration. When the hard plate 54 (see FIGS. 6 and 7) is arranged between the cushion pan 70 and the cushion pad 50 according to the third embodiment, the diameter of the hard plate 54 is larger than the diameter of the disc spring portion 38. It is preferable to set and to interpose the hard plate 54 between a large number of circumferential slits 74 (fragile portions 72) and the cushion pad 54. As a result, it is possible to prevent the cushion pad 50 from being damaged by interference with the circumferential slit 74. This point is the same in the fourth and sixth embodiments.

<Fourth Embodiment>
FIG. 11 shows a perspective view of the cushion pan 80 according to the fourth embodiment of the present invention. The cushion pan 80 is similar to the cushion pan 30 according to the first embodiment, but is a portion of the bottom wall portion 32 adjacent to the disc spring portion 38, that is, a portion of the general portion 36 adjacent to the disc spring portion 38. However, it is said that the vulnerable part 82 is locally vulnerable. Similar to the third embodiment, the fragile portion 82 is formed with a large number of circumferential slits 84 extending in the circumferential direction of the disc spring portion 38 arranged side by side in the circumferential direction of the disc spring portion 38. Also in this embodiment, basically the same effects as those in the third embodiment can be obtained.

<Fifth Embodiment>
FIG. 12 shows a perspective view of the cushion pan 90 according to the fifth embodiment of the present invention. The cushion pan 90 is similar to the cushion pan 30 according to the first embodiment, but a step portion 92 is formed between the cushion pan 90 and the general portion 36 on the outer peripheral portion of the disc spring portion 38, and the disc spring The portion 38 projects stepwise from the general portion 36 toward the upper side of the seat. In this embodiment, the configurations other than the above are the same as those in the second embodiment.

In this embodiment as well, basically the same effects as those in the first embodiment can be obtained. Moreover, in this embodiment, a step portion 92 is formed between the general portion 36 of the bottom wall portion 32 and the disc spring portion 38, and the disc spring portion 38 projects stepwise from the general portion 36 toward the upper side of the seat. There is. Therefore, when a load is applied to the disc spring portion 38 from the upper side of the seat, the outer circumference of the disc spring portion 38 tends to expand, and the disc spring portion 38 tends to bend. Therefore, the ride quality of the seated person P can be further improved.

<Sixth Embodiment>
FIG. 13 shows a perspective view of the cushion pan 100 according to the sixth embodiment of the present invention. The cushion pan 100 is similar to the cushion pan 30 according to the first embodiment, but is a portion of the bottom wall portion 32 adjacent to the disc spring portion 38, that is, a portion of the general portion 36 adjacent to the disc spring portion 38. However, it is said that the vulnerable part 102 is locally vulnerable. Specifically, the fragile portion 102 is formed with a large number of fragile holes 104 arranged in the circumferential direction and the radial direction of the disc spring portion 38. These fragile holes 104 are formed in a circular shape in a plan view. In this embodiment, the configurations other than the above are the same as those in the first embodiment.

Also in this embodiment, basically the same effects as those in the first embodiment can be obtained. Moreover, as in the third and fourth embodiments, when a load is applied to the disc spring portion 38 from the upper side of the seat, the outer circumference of the disc spring portion 38 is likely to expand, and the disc spring portion 38 is easily bent. Become. Therefore, the ride quality of the seated person P can be further improved. Moreover, not only the disc spring portion 38 but also the fragile portion 102 in which a large number of fragile holes 104 are formed becomes easy to bend, so that the riding comfort of the seated person P can be further improved.

<7th Embodiment>
FIG. 14 shows a perspective view of the cushion pan 110 according to the seventh embodiment of the present invention. The cushion pan 110 is similar to the cushion pan 30 according to the first embodiment, but the disc spring portion 38 is formed with a large number of weakening holes 112 arranged in the circumferential direction of the disc spring portion 38. There is. These weakening holes 112 are formed in a circular shape in a plan view, and are formed on the outer peripheral side of the disc spring portion 38. In this embodiment, the configurations other than the above are the same as those in the first embodiment.

Also in this embodiment, basically the same effects as those in the first embodiment can be obtained. Moreover, since the large number of weakening holes 112 are formed in the disc spring portion 38, the disc spring portion 38 is easily bent, so that the riding comfort of the seated person P can be further improved.

<8th Embodiment>
FIG. 15 shows the cushion pan 120 according to the eighth embodiment of the present invention in the same cross-sectional view as in FIG. The cushion pan 120 is similar to the cushion pan 30 according to the first embodiment, but is a disc spring portion formed separately from the peripheral wall portion 34 (not shown in FIG. 15) and the general portion 36 of the bottom wall portion 32. 38 is configured to be connected to the general portion 36. A circular hole 122 is formed in the general portion 36 at a portion facing the disc spring portion 38, and a flange portion 38B formed on the outer peripheral portion of the disc spring portion 38 is overlapped with the edge portion of the hole 122. There is. The flange portion 38B is connected to the edge portion of the hole 122 by means such as crimping, riveting, or welding. The flange portion 38B may be omitted, and the outer circumference of the disc spring portion 38 and the inner circumference of the hole 122 may be joined by welding or the like in a state of being butted against each other. In this embodiment, the configurations other than the above are the same as those in the first embodiment.

In this embodiment, basically the same effects as those in the first embodiment can be obtained except for the effects obtained by integrally forming the disc spring portion 38 and the general portion 36. Moreover, for example, quenching or shot peening can be performed only on the disc spring portion 38 formed separately from the general portion, so that the spring characteristics of the disc spring portion 38 can be easily adjusted.

Although not shown, the cushion pans 30 and 120 according to the first or eighth embodiment may have a configuration in which the disc spring portion 38 is formed thinner than the general portion 36. As a result, the disc spring portion 38 is easily bent, so that the riding comfort of the seated person P can be further improved.

Further, in the first to eighth embodiments, the central hole 40 and a large number of slits 42 are formed on the central portion side of the disc spring portion 38, but the present invention is not limited to this, and the central portion of the disc spring portion is not limited to this. A circular and large-diameter hole may be formed on the side (central portion).

Further, in the first to eighth embodiments, the general portion 36 of the bottom wall portion 32 has a flat portion 36S formed in a flat shape (flat plate shape), and the flat portion 36S is around the disc spring portion 38. Although the configuration is provided, the configuration is not limited to this, and the general portion 36 may be formed in an uneven shape around the disc spring portion 38.

In addition, the present invention can be implemented with various modifications without departing from the gist thereof. Further, it goes without saying that the scope of rights of the present invention is not limited to the above-described embodiment.

10 Vehicle seat 12 Seat cushion 30 Cushion pan 32 Bottom wall 36 General part 38 Countersunk spring part 40 Center hole 42 Radial slit 50 Cushion pad 54 Hard plate 60 Cushion pan 70 Cushion pan 72 Vulnerable part 74 Circumferential slit 80 Cushion pan 82 Vulnerable part 84 Circumferential slit 90 Cushion pan 92 Step part 100 Cushion pan 102 Vulnerable part 104 Vulnerable hole 110 Cushion pan 112 Weakened hole 120 Cushion pan

Claims (16)

Provided on the seat cushion, which has a bottom wall for supporting the cushion pad from the seat lower side, disc spring portion that bulges to the disc spring shaped to seat the upper side is provided on the bottom wall portion, the conical spring part , A cushion pan formed so that the central portion is located below the hip point of the seated person seated on the seat cushion. The cushion pan according to claim 1, wherein the general portion of the bottom wall portion provided around the disc spring portion and the disc spring portion are integrally formed. The cushion pan according to claim 1, wherein the general portion of the bottom wall portion provided around the disc spring portion and the disc spring portion are coupled. The cushion pan according to any one of claims 1 to 3, wherein the disc spring portion has a central hole formed in the central portion and a large number of radial slits extending radially from the central hole. The cushion pan according to any one of claims 1 to 4, wherein the portion of the bottom wall portion adjacent to the disc spring portion is a locally weakened fragile portion. The cushion pan according to claim 5, wherein a large number of circumferential slits extending in the circumferential direction of the disc spring portion are formed in the fragile portion in the circumferential direction. The cushion pan according to claim 5, wherein a large number of fragile holes arranged in the circumferential direction and the radial direction of the disc spring portion are formed in the fragile portion. A step portion is formed on the outer peripheral portion of the disc spring portion between the disc spring portion and the general portion of the bottom wall portion provided around the disc spring portion, and the disc spring portion is above the seat from the general portion. The cushion pan according to any one of claims 1 to 4, which projects stepwise toward the side. The cushion pan according to any one of claims 1 to 4, wherein a large number of weakening holes arranged in the circumferential direction of the disc spring portion are formed in the disc spring portion. The cushion pan according to any one of claims 1 to 4, wherein the disc spring portion is formed thinner than a general portion of the bottom wall portion provided around the disc spring portion. The seat cushion has a bottom wall portion that supports the cushion pad from the lower side of the seat, and a disc spring portion that bulges like a disc spring toward the upper side of the seat is provided on the bottom wall portion. , A cushion pan having a central hole formed in a central portion and a large number of radial slits extending radially from the central hole. The bottom wall portion is provided on the seat cushion and has a bottom wall portion that supports the cushion pad from the lower side of the seat, and a disc spring portion that bulges like a disc spring toward the upper side of the seat is provided on the bottom wall portion. The portion adjacent to the disc spring portion is a cushion pan which is considered to be a locally fragile portion. The cushion pan according to claim 12, wherein a large number of circumferential slits extending in the circumferential direction of the disc spring portion are formed in the fragile portion in the circumferential direction. The cushion pan according to claim 12, wherein a large number of fragile holes arranged in the circumferential direction and the radial direction of the disc spring portion are formed in the fragile portion. A vehicle seat provided with a cushion pad and a seat cushion having a cushion pan according to any one of claims 1 to 14, wherein the cushion pad and the cushion pad are supported from the lower side of the seat by the bottom wall portion. The vehicle seat according to claim 15, further comprising a hard plate formed in a plate shape by a material harder than the cushion pad and arranged between the cushion pad and the disc spring portion.

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