JPH08150864A - Seat for vehicle - Google Patents

Abstract

PURPOSE: To provide a seat for a vehicle with which vibration transmitted to a seated person can be reduced, and with which impact force applied to hipbones of the seated person by irregularities on ground, irregularities on snowy ground, waves, landing, an air pocket, or quick deceleration can be reduced. CONSTITUTION: An impact absorbing material 15 is disposed on a seat 10 on which a person can be seated at a seated part 10a of the person, and a thickness H0 of the seat 10, a thickness H1 of the impact absorbing material 15, and a thickness H2 as the thickness H1 of the impact absorbing material 15 deducted from the thickness H0 of the seat 10 are set to satisfy relations of 20<H0<90mm, 5<H1<20mm, 0.125<H1/H2<1, and 0.1<H1/H0<0.5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle seat using a shock absorbing material.

[0002]

2. Description of the Related Art For example, in a seat used for a motorcycle, a cushion body made of urethane foam is usually wrapped with a synthetic leather seat cover and mounted on a bottom plate made of a hard plate member. The cushioning body absorbs vibrations generated by the vehicle body during running due to engine vibrations and road surface irregularities, so that it is not transmitted to seated people such as drivers and passengers as much as possible. There is.

In such a motorcycle seat,
Since cushioning made of urethane foam is not enough to absorb the impact on the seated person, a cushion made of urethane foam with a viscoelastic body (superabsorbent elastic body) such as a viscoelastic urethane elastomer laminated It has been publicly known that, when used as a body, the vibration is sufficiently absorbed by the viscoelastic body to reduce the vibration felt by the seated person (see Japanese Patent Laid-Open No. 2-286481).

[0004]

By the way, the seats for vehicles such as passenger cars, trucks, buses, golf cars, buggy cars, small snowmobiles, planing boats, aircrafts, etc. are not limited to such motorcycles. In addition to reducing vibration transmission as much as possible, it is required to have a function to mitigate the impact force applied to the occupant by road unevenness, running place unevenness, snowy field unevenness, waves, landing or air pockets, or sudden acceleration / deceleration. It Conventionally, a layered viscoelastic body (superabsorbent elastic body) is used as a cushion body to prevent vibrations from being transmitted to a seated person. Since the impact force from the lower part of the seat concentrates on the seat, it is necessary to reduce the impact force in the vicinity of the ischium.

Further, in the case of a seat having a backrest, impact force concentrates on the pelvis and lumbar vertebra of the seated person from the back of the seat, so that in the vicinity of the pelvis and lumbar vertebra,
It is necessary to reduce the impact force.

An object of the present invention is to eliminate the above-mentioned inconveniences of conventional vehicle seats. More specifically, it is possible to reduce the transmission of vibrations to a seated person and to improve the unevenness of the road. It is an object of the present invention to provide a vehicle seat that alleviates the impact force applied to the occupant's skeleton due to the unevenness of the running place, the unevenness of the snowy field, waves, landing or air pockets, or rapid acceleration / deceleration. A further object of the present invention is to provide a vehicle seat that alleviates the impact force applied to the seated person's pelvis and the vicinity of the lumbar spine.

[0007]

In order to solve the above-mentioned problems and to achieve the object, the invention according to claim 1 arranges a shock absorbing material in a seating portion of a seated person on a seat on which the seated person can sit. Then, the thickness H0 of the sheet, the thickness H1 of the shock absorbing material, and the thickness H2 obtained by subtracting the thickness H1 of the shock absorbing material from the thickness H0 of the sheet, 20 <H0 <90 (mm ) 5 <H1 <20 (mm), and 0.125 <H1 / H2 <1 0.1 <H1 / H0 <0.5.

According to the second aspect of the present invention, the impact absorbing material is arranged in the seating portion of the seated person on the seat on which the seated person can sit, and the recessed portion is not formed in the high seat pressure portion of the impact absorbing material. The feature is that the concave portion is formed in the portion where the seat pressure is low.

According to a third aspect of the present invention, a shock absorbing material is arranged in a seating portion of the seated person on a seat on which the seated person can be seated, a recess is formed in the shock absorbing material, and the diameter of the recess is reduced from the upper side to the lower side. It is characterized by changing as it goes.

According to a fourth aspect of the present invention, a shock absorbing material is arranged in a seating portion of the seated person on a seat on which the seated person can be seated, and a concave portion is formed in the shock absorbing material to change the density or diameter of the concave portion. The feature is to let.

According to a fifth aspect of the present invention, a shock absorbing material is arranged on a seating portion of the seated person on a seat on which the seated person can sit, and the upper portion of the shock absorbing material is formed into a convex curved surface when viewed in the vehicle width direction. It is characterized by being formed.

According to a sixth aspect of the present invention, a shock absorbing material is arranged in a seating portion of the seated person on a seat on which the seated person can sit, and the upper portion of the shock absorbing material is formed into a concave curved surface when viewed in the vehicle width direction. It is characterized by having done.

According to a seventh aspect of the present invention, a shock absorbing material is arranged in a seating portion of the seated person on a seat on which the seated person can sit, and the thickness of the shock absorbing material is changed in the longitudinal direction of the vehicle. It has a feature.

According to an eighth aspect of the present invention, a shock absorbing material is arranged in a seating portion of the seated person on a seat on which the seated person can sit, and an inclined surface in the front or rear direction of the vehicle is provided above the shock absorbing material. It is characterized in that the unevenness having is formed.

According to a ninth aspect of the present invention, in a seat on which a seated person can sit, a shock absorber is arranged in a seated portion of the seated person, and an uneven portion is provided in a portion of the seat where the shock absorber is placed. It has a feature.

According to a tenth aspect of the invention, a shock absorbing material is arranged in a seating portion of a seated person on a seat on which the seated person can sit.
Elasticity is given to a portion of the sheet on which the impact absorbing material is placed.

According to an eleventh aspect of the present invention, a shock absorbing material is arranged in a seating portion of a seated person on a seat on which the seated person can sit.
In the seat, a storage recess is provided in a portion of the cushion main body where the shock absorber is placed, the shock absorber is thickened from the storage recess to form a tightening margin, and the seat is provided with an impact recess from the storage recess. It is characterized in that the peripheral portion is made small to form a gap, and the shock absorbing material is pressed and fixed by the cushion body and the bottom plate.

According to a twelfth aspect of the present invention, a shock absorbing material is arranged in a seating portion of a seated person on a seat on which the seated person can sit.
It is characterized in that the impact absorbing material is embedded in the sheet.

According to a thirteenth aspect of the present invention, a shock absorbing material is arranged in a seating portion of a seated person on a seat on which the seated person can sit.
It is characterized in that the shock absorbing material is wrapped with a heat insulating material.

According to a fourteenth aspect of the present invention, a shock absorbing material is arranged in a seating portion of a seated person in a seat on which the seated person can sit.
A heat insulating material is arranged on the top or bottom of the sheet.

According to a fifteenth aspect of the present invention, a shock absorbing material is arranged in a seating portion of the seated person in a seat on which the seated person can sit.
The seat is characterized in that the shock absorbing material is put in a mold to foam a cushion material, and the cushion material and the shock absorbing material are adhered to each other.

According to a sixteenth aspect of the present invention, the impact absorbing material is characterized in that a resin-made microballoon is mixed in a super soft urethane elastomer serving as a matrix resin.

According to a seventeenth aspect of the present invention, in the shock absorbing material, resin microballoons are mixed in an amount of 1 to 5% (% by weight) with respect to the super soft urethane elastomer.

According to the eighteenth aspect of the present invention, in the shock absorbing material, the ratio of the spring constant during compression to the spring constant during tension (spring constant during compression / spring constant during tension) is 1.1 or more. The storage elastic modulus is 0.22 MPa or less.

According to a nineteenth aspect of the present invention, an impact absorbing material is arranged in a seating portion of a seat having a backrest portion capable of being seated by a seated person, and in the backrest portion, a vertical upward distance of at least 80 to 180 mm from the seating portion is provided. The feature is that the shock absorber is arranged in the range of.

[0026]

According to the first aspect of the present invention, the transmission of vibration to the seated person is reduced by defining the relationship between the thickness of the seat and the thickness of the shock absorbing material, and the seated person's vibration is caused by the vibration of the vehicle. It reduces the impact force applied near the ischium.

According to the second aspect of the present invention, the hardness of the shock absorber is reduced by a simple structure without forming the recess in the high seat pressure portion of the shock absorber, but forming the recess in the low seat pressure portion. Can be adjusted to reduce the impact force applied to the vicinity of the seat bones of the seated person due to the vibration of the vehicle or the like, and improve the sitting comfort.

According to the third aspect of the present invention, a recess is formed in the shock absorbing material, the diameter of the recess is changed from the upper side to the lower side, and the elasticity is changed as the seat sunk amount is changed. The impact force applied to the vicinity of the seat bones of the seated person is mitigated and the sitting comfort is improved.

According to the fourth aspect of the present invention, a recess is formed in the shock absorbing material, and the density or the diameter of the recess is changed in accordance with, for example, the seat pressure distribution, so that a shift when seated can be prevented, and vibration of the vehicle can be prevented. As a result, the impact force applied to the vicinity of the seat bones of the seated person is alleviated and the sitting comfort is improved.

According to the fifth aspect of the present invention, the upper portion of the shock absorbing material is formed into a convex curved surface when viewed from the vehicle width direction, and the fitting feeling is improved by matching the outer shape of the seat with the convex shape of the saddle riding shape. To do.

According to the sixth aspect of the present invention, the upper portion of the shock absorbing material is formed into a concave curved surface when viewed from the vehicle width direction, and lateral displacement in the vehicle width direction is prevented by vibration of the vehicle or the like.

According to the seventh aspect of the present invention, the thickness of the shock absorbing material is changed in the front-rear direction of the vehicle, and deviation of the vehicle in the front-rear direction due to vibration of the vehicle is prevented.

According to the eighth aspect of the present invention, the bumps are formed on the upper portion of the shock absorbing material so as to have a frontward or rearward inclined surface so that the vehicle is prevented from shifting in the front-rear direction due to vibration or the like. It

According to the ninth aspect of the present invention, the uneven portion is provided in the portion of the seat on which the shock absorbing material is placed, and the unevenness increases the amount of bending of the shock absorbing material, and reduces the transmission of vibration to the seated person. The impact force applied to the vicinity of the seat bones of the seated person due to the vibration of the vehicle is mitigated.

According to the tenth aspect of the invention, elasticity is imparted to the portion of the seat on which the impact absorbing material is placed to reduce the transmission of vibration to the seated person, and the impact applied to the seat bone of the seated person due to vibration of the vehicle or the like. Relax the power.

According to the eleventh aspect of the present invention, when the shock absorbing material is placed in the storage recess of the seat and the seat is clamped and fixed to the bottom plate, the shock absorbing material is pushed and spreads and is stored in the storage recess without any gap, and the shock is absorbed. The absorber is prevented from shifting.

According to the twelfth aspect of the present invention, the impact absorbing material is embedded in the sheet so that the impact absorbing material is not easily affected by heat, and the performance of the impact absorbing material is impaired by the effect of heat. Is being prevented.

According to the thirteenth aspect of the present invention, the impact absorbing material is wrapped with a heat insulating material so that the impact absorbing material is not easily affected by heat, and the performance of the impact absorbing material is impaired by the effect of heat. To prevent.

According to the fourteenth aspect of the present invention, the heat insulating material is arranged on the top or bottom of the sheet, and the shock absorbing material is structured so as not to be easily affected by heat. The performance of the shock absorbing material is impaired by the effect of heat. Are prevented.

In the fifteenth aspect of the present invention, the sheet has a cushioning material foamed by placing a shock absorbing material in a molding die,
The cushioning material and the shock absorbing material are bonded to each other, and tension applied to the shock absorbing material by the load applied to the seat increases elasticity, which reduces the transmission of vibrations to the seated person and also reduces vibrations of the seated person. Relieves the impact force applied to the vicinity of the ischium.

In the sixteenth aspect of the present invention, the shock absorbing material is a super soft urethane elastomer, which is a matrix resin, in which resin microballoons are mixed. The adhesiveness of the shock absorbing material using urethane elastomer as the matrix resin becomes low, and the handling becomes easy, and the assembling work of the shock absorbing material to the sheet becomes easy.

According to a seventeenth aspect of the present invention, the shock absorbing material is such that resin microballoons are mixed in an amount of 1 to 5% (% by weight) with respect to the supersoft urethane elastomer, and the supersoft urethane elastomer and the resin microballoons are used. The mixture (2) does not separate into two layers after the casting and curing, and the viscosity is so high that air does not enter during the casting.

In the eighteenth aspect of the present invention, the shock absorbing material has a ratio of the spring constant during compression to the spring constant during tension (spring constant during compression / spring constant during tension) of 1.1 or more, The storage elastic modulus is 0.22 MPa or less, the weight increase when the shock absorber is assembled to the seat is small, the fit feeling when seated is improved, and the sitting comfort of the seat is improved.

According to the nineteenth aspect of the present invention, the impact absorbing material is arranged in the seating portion of the seat having the backrest portion on which the seated person can sit, and at least the vertical distance from the seating portion is 80 to 180 mm in the seatback portion. The shock absorber is placed on the upper part of the body to support the upper end of the driver's pelvis and the lumbar spine while driving, and the upper body is stable and comfortable. Further, it reduces the transmission of vibrations to the driver and reduces the impact force applied to the occupant's bones, the pelvis, and the vicinity of the lumbar vertebra due to unevenness or rapid acceleration / deceleration of the road.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a vehicle seat according to the present invention will be described below with reference to the drawings.

First, a motorcycle seat will be described as a vehicle seat of the present invention. 1 to 5 show an embodiment of a vehicle seat according to claim 1, FIG. 1 is a side view of the motorcycle in a state in which a driver gets on the vehicle, FIG. 2 is a sectional view of the seat, and FIG. 3 is a plane of the seat. Figure, Figure 4 is IV-IV of Figure 2.
FIG. 5 is a cross-sectional view taken along the line, and FIG. 5 is a diagram showing sitting comfort characteristics.

An engine 2 is mounted on a body frame 1 of a motorcycle, and a head pipe 3 on the front side of the body frame 1 is mounted.
Is provided with a front fork 4. A front wheel 5 is provided below the front fork 4, and a handle 6 is provided above.
And the handle 6 has grips 7 on both sides. A rear arm 700 is provided on the rear side of the vehicle body frame 1, and a rear wheel 8 is provided on the rear portion of the rear arm 700. A fuel tank 9 is arranged above the vehicle body frame 1, and a seat 10 is provided behind the fuel tank 9. The seat 10 has a seating portion 10a on which the driver A sits.
Is a tandem seat in which a seating portion 10b on which a passenger is seated is formed continuously in a stepwise manner. The driver A puts his foot on the step 11 and sits on the seat 10a of the seat 10, grips the grip 7 of the steering wheel 6 and steers, and the passenger sits on the seat 10b and rides.

The seat 10 has a bottom plate 12 made of a plate-like body such as metal or hard synthetic resin, and a mounting stay 13 is provided below the bottom plate 12, and the mounting stay 13 is attached to the vehicle body frame 1. It is attached together.
Above the bottom plate 12, a urethane foam cushion body 14 and a viscoelastic shock absorbing material 15, 16 are provided.
The seat 17 made of synthetic leather made of PVC (polyvinyl chloride) leather and Woolly nylon lining is fixed to the periphery of the bottom plate 12 so as to cover the surface of the cushion 17. .

A pair of left and right shock absorbers 15 are arranged on the seating portion 10a of the driver A of the seat 10, and
As shown in FIG. 3, the width D11 in the front-rear direction of the vehicle is set to about 240 mm, and the width D12 in the vehicle width direction is set to about 100 mm on both sides. Further, a pair of left and right impact absorbing materials 16 are arranged in the seating portion 10b of the passenger, and the impact absorbing material 16 has a width D21 in the front-rear direction of the vehicle of, for example, about 200 mm and a vehicle width as shown in FIG. The width D22 in the direction is set to about 100 mm on both sides.

As shown in FIG. 1, the impact absorbing member 15 arranged on the seating portion 10a of the driver A of the seat 10 has a center point P1 of the impact absorbing member 15 extending horizontally from the grip point P2 to a horizontal distance Y ±. It is set within the range of 100 (mm).

However, Y = 164.1 + 0.869X, and X = the horizontal distance (mm) between the grip point P2 and the step point P3.

As described above, the impact absorbing material 15 is arranged on the seating portion 10a of the driver A of the seat 10 and the impact absorbing material 1 is provided.
By specifying the arrangement position of No. 5, the transmission of vibration to the buttocks of the driver A is reduced, and the impact force applied to the vicinity of the ischium A2 of the pelvis A1 of the driver A due to unevenness of the road or rapid acceleration / deceleration is mitigated can do.

In the seat 10, the impact absorbing material 15 is arranged on the driver's seating portion 10a on the front side, and the shock absorbing material 16 is arranged on the rear side on the left and right sides of the passenger's seating portion, as shown in FIG. In addition, the center point P4 of the shock absorbing material 16 arranged in the seating portion of the passenger is located behind the center point P1 of the shock absorbing material 15 of the seating portion 10a of the driver A at a horizontal distance of about 350 (mm). It is set.

In this way, the impact absorbing material 16 is arranged on the seating portion 10b of the passenger of the seat 10 and the impact absorbing material 16 is provided.
It is possible to reduce the transmission of vibrations to the passenger's buttocks and reduce the impact force applied to the vicinity of the passenger's skeleton due to unevenness of the road or rapid acceleration / deceleration by specifying the arrangement position of the passenger.

The center point P1 of the left and right shock absorbers 15
And the distance D4 between the center points P4 of the left and right shock absorbers 16 are set in the range of about 110 to 140 mm, respectively, to reduce the impact force applied to the vicinity of the left and right ischium A2 of the pelvis A1. You can

Further, as shown in FIG. 2, the thickness H0 of the sheet 10 is set to the thickness H1 of the shock absorbing material 15, and the thickness H0 of the sheet 10 is subtracted from the thickness H1 of the shock absorbing material 15. H2, 20 <H0 <90 (mm) 5 <H1 <20 (mm), 0.125 <H1 / H2 <1 0.1 <H1 / H0 <0.5 are doing.

Thus, the thickness H0 of the sheet 10 is set to 2
0 <H0 <90 (mm), the thickness H of the shock absorbing material 15
When 1 is set to 5 <H1 <20 (mm), when the thickness H0 of the sheet 10 is 90 mm, the thickness H1 of the impact absorbing material 15 is
Is 10 mm or more, H1 / H0 = 0.1, H1 / H
2 = 0.125, and when the thickness H0 of the sheet 10 is 20 mm, the thickness H1 of the shock absorbing material 15 is 10 mm.
In the following, H1 / H0 = 0.5 and H1 / H2 = 1.

FIG. 5A shows, for example, the thickness H of the sheet 10.
When 0 is 90 mm, the thickness H1 of the impact absorbing material 15 is changed to show the characteristic of sitting comfort, and the sitting comfort is best when the thickness H1 of the impact absorbing material 15 is 20 mm. And the reason why I feel comfortable is that H1 is 10mm to 40mm.
Is in between. Further, in FIG. 5B, for example, when the thickness H0 of the sheet 10 is 20 mm, the thickness H1 of the shock absorbing material 15 is
To show the characteristic of sitting comfort, and when the thickness H1 of the shock absorbing material 15 is 5 mm, the sitting comfort is good.

From the above, it can be said that when the respective equations of 0.1 <H1 / H0 <0.4 0.125 <H1 / H2 <1 are satisfied, comfortable sitting can be secured.

In this embodiment, the thickness of the sheet 10 and the thickness of the shock absorbing material 15 have been described.
The thickness of 0 and the thickness of the impact absorbing material 16 are set in the same manner.

6 to 8 show another embodiment of the vehicle seat according to claim 1, FIG. 6 is a side view of the scooter type motorcycle in a state in which a driver is riding, and FIG. 7 is a seat back. FIG. 8 is a sectional view of the portion, and FIG. 8 is a view showing the impact absorbing material of the backrest portion.

In the scooter type motorcycle, a body frame (not shown) is covered with a front cover 20, a rear cover 21 and a floor cover 22. Driver A has floor cover 22
Put your foot on the seat and sit on the seat 23 to drive. Sheet 2
3 includes a backrest portion 2 behind the seating portion 23a of the driver A.
3b is provided. In the seating portion 23a of the driver A, a cushion 28 including a cushion main body 25 made of urethane foam and a shock absorbing material 26 made of a viscoelastic body is placed above the bottom plate 24, and is made of PVC (polyvinyl chloride).
A synthetic leather seat cover 29 made of a leather cover and a wooly nylon lining covers the surface of the cushion 28 and is fixed to the periphery of the bottom plate 24.

Similarly, on the backrest 23b, on the front side of the bottom plate 30, a cushion body 31 made of a urethane foam cushion body 31 and a viscoelastic shock absorber 32 is placed, and PVC (polyvinyl chloride) is used. ) A synthetic leather seat outer surface 34 made of a leather outer material and a wooly nylon lining covers the surface of the cushion 33,
It is fixed to the peripheral edge of the bottom plate 30. As shown in FIG. 8, the shock absorber 32 has a width D5 in the vehicle width direction set to, for example, about 250 mm, and a width D6 in the height direction.
Is formed to have a thickness of, for example, about 150 mm.

Impact absorbing material 3 arranged on the backrest 23b
The center point P5 of 2 is set in consideration of the amount of bending of the seating portion 23a by the weight of the driver A of about 30 mm, and the seating portion 23a of the driver A is considered.
Vertically upward distance Z from the pressing point P6 of about 80 to 180 (m
The position is set to about m). That is, the impact absorbing material 3 is placed at a position where the upper end portion A3 of the pelvis A1 of the driver A hits the center.
2 are arranged.

In this way, the impact absorbing material 26 is arranged on the seat portion 23a of the driver A of the seat 23, and the backrest portion 2 is provided.
The shock absorber 32 is arranged on the seat portion 3b, and the backrest portion 2
By specifying the arrangement position of the impact absorbing material 32 arranged in 3b, the upper part of the upper body of the driver A is supported near the upper end portion A3 and the lumbar portion A4 of the pelvis A1 and the upper body is stable and comfortable. When the driver A is seated, the impact force from the rear of the seat concentrates and acts on the buttocks near the upper end portion A3 of the pelvis A1 and the lumbar portion A4.
2 can reduce the impact force in the vicinity of the pelvis and the lumbar spine.

The thickness of the sheet 23 is set to H0, the thickness of the shock absorbing material 26 is set to H1, and the thickness H2 of the sheet 23 is subtracted from the thickness H1 of the shock absorbing material 26. Since H0 and the thickness H1 of the shock absorbing material 26 are set in the same manner as in the above-mentioned embodiment, the description thereof will be omitted. Further, also in the backrest portion 23b, the thickness H0 of the seat 23 and the thickness H1 of the shock absorbing material 32 are set in the same manner, and thus the description thereof will be omitted.

FIG. 9 is a plan view showing an embodiment of the vehicle seat according to the invention. In the seat 50 of this embodiment, the recess 52 is not formed in the portion 51a where the seat pressure is high, but the recess 52 is formed in the portion 51b where the seat pressure is low. The shock absorber 51 is provided in the seating range of the driver A, and the recess 52 is formed by making a hole in the shock absorber 51. In this embodiment, a concave portion 52 is formed on the front side of the shock absorbing material 51 at a portion where a particularly sensitive thigh portion hits, so that the shock absorbing material 51 is softened.

As described above, the recess 52 is not formed in the portion 51a where the seat pressure is high and the recess 52 is formed in the portion 51b where the seat pressure is low, so that the impact absorber has a simple structure. The hardness of 51 can be adjusted.

FIG. 10 shows an embodiment of a vehicle seat according to claim 3, and FIG. 10 (a) is a plan view of the seat.
(B) is a sectional view of the shock absorbing material. In the seat 60 of this embodiment, a recess 62 is formed in the impact absorbing material 61. As shown in FIG. 10B, the recess 62 is formed by making a hole in the shock absorbing material 61, and the diameter of the recess 62 is changed from the upper side to the lower side.

As described above, by forming the concave portion 62 in the shock absorbing material 61 and changing the diameter of the concave portion 62 from the upper side to the lower side, the elasticity changes as the seat sunk amount changes, and the seated person's sitting Improves comfort.

11A and 11B show another embodiment of a vehicle seat for a vehicle seat according to a fourth aspect of the invention. FIG. 11A is a plan view of the seat, and FIG. 11B is a sectional view of the seat. . In the seat 65 of this embodiment, the front side portion 6a of the shock absorber 66 is formed with concave portions having a small density or diameter, and the rear side portion 66b is formed with concave portions having a large density or diameter.
6a is hard and the rear side 66b is soft. Therefore, when the driver A is seated, the front side portion 66a is small in deflection and the rear side portion 66b is large, so that the buttocks of the driver A are prevented from being displaced forward.

As described above, by changing the density or diameter of the recesses in the shock absorbing material 66 in accordance with, for example, the distribution of the seat pressure, it is possible to prevent the seat occupant from being displaced and to improve the sitting comfort.

12 to 15 show claims 4 to 7.
1 shows an example of the described vehicle seat. In the embodiment of FIG. 12, the upper portion of the shock absorbing material 67 arranged on the seat 65 is formed into a convex curved surface 67a when viewed from the vehicle width direction, and a fit feeling is obtained by matching the outer shape of the seat with a saddle-shaped convex shape. improves.

In the embodiment shown in FIG. 13, the upper surface of the shock absorbing material 68 arranged on the seat 65 is a concave curved surface 68 as viewed in the vehicle width direction.
It is formed in a to prevent lateral displacement in the vehicle width direction due to vehicle vibration, road irregularities, or sudden acceleration / deceleration.

In the embodiment shown in FIG. 14, the front side portion 69a of the shock absorbing material 69 arranged on the seat 65 is made thicker and the rear side portion 69b is made thinner to change the thickness in the longitudinal direction of the vehicle. The front side portion 69a of the shock absorbing material 69 is thin and the rear side portion 69a is
It is also possible to make b thick and change the thickness in the front-back direction of the vehicle. In this way, the thickness of the shock absorbing material 69 is changed in the front-rear direction of the vehicle, so that the vehicle is prevented from shifting in the front-rear direction due to vehicle vibration, road irregularities, or sudden acceleration / deceleration.

In the embodiment of FIG. 15, the bumps 70a having the inclined surface in the front direction of the vehicle are formed on the upper portion of the shock absorber 70 arranged on the seat 65. In addition, it is also possible to form unevenness having an inclined surface in the rearward direction of the vehicle on the upper portion of the shock absorber 70. Thus, the unevenness 70a having the inclined surface in the front or rear direction of the vehicle is formed on the upper portion of the shock absorbing material 70, and the deviation in the front-back direction of the vehicle due to the vibration of the vehicle, the unevenness of the road, or the rapid acceleration / deceleration. To be prevented.

16 to 18 show claims 8 to 1.
The example of the vehicle seat of 0 is shown. In the embodiment shown in FIG. 16, as shown in FIG. 16A, the shock absorber 73 is placed on the bottom plate 72 of the seat 71, and the cushion body 74 is placed on the shock absorber 73. As shown in the enlarged view of FIG. 16B, the rib 72a forms an uneven portion 72b inside the bottom plate 72, and the shock absorber 73 is arranged on the uneven portion 72b. As described above, the uneven portion 72b is provided in the portion of the sheet 71 on which the shock absorbing material 73 is placed, and when the shock absorbing material 73 receives pressure, the shock absorbing material 73 enters between the ribs 72a of the uneven portion 72b. The amount of bending of the shock absorbing material 73 is increased to reduce the transmission of vibration to the seated person, and
The impact force applied to the buttocks of the seated person can be mitigated by the unevenness of the road or the rapid acceleration / deceleration.

FIG. 17 is an enlarged view of the sheet. In this embodiment, a thin portion 72c is formed on the bottom plate 72, and the shock absorbing material 73 is arranged on the thin portion 72c. In this way, by imparting elasticity to the thin portion 72c of the seat 71 on which the shock absorbing material 73 is placed, it is possible to reduce the transmission of vibrations to the seated person, and to protect the seated person's buttocks by unevenness of the road or rapid acceleration / deceleration. The impact force applied can be reduced.

FIG. 18 is an enlarged view of the seat. In this embodiment, an opening 72d is formed in the bottom plate 72,
A spring member 74 is provided so as to cover the opening 72d from the inside, and the shock absorber 73 is arranged on the spring member 74. In this way, by imparting elasticity to the portion of the seat 71 on which the shock absorbing material 73 is placed by the spring material 74, it is possible to reduce the transmission of vibrations to the seated person, and the unevenness of the road or sudden acceleration / deceleration of the seated person It is possible to reduce the impact force applied to the buttocks.

FIG. 19 shows an embodiment of a vehicle seat according to claim 11. 19A is a cross-sectional view of the cushion body, and FIG. 19B is a bottom view of the cushion body. The cushion body 76 is provided with a storage recess 76a in a portion where the shock absorbing material 77 is placed. Storage recess 76a
Corner portions 76b are provided with rounded corners to prevent the cushion body 76 from cracking. 19 (c) and 19 (d)
Shows the assembled state of the shock absorber, and the cushion body 76
The impact absorbing material 77 is made thicker than the storage recessed portion 76a to form a tightening margin J, and the clearance K is formed by making the peripheral portion of the shock absorbing material 77 smaller than the storage recessed portion 76a as an escape portion.
The cushion main body 76 and the bottom plate 78 press the shock absorbing material 77 to tighten and fix it, and the seat skin 79 covers the surface of the cushion main body 76 and adheres to the peripheral edge of the bottom plate 78 to form the seat 80. .

In this way, the shock absorber 77 is placed in the storage recess 76a of the cushion body 76,
When 6 is fastened and fixed to the bottom plate 78, the shock absorbing material 77 is pushed and spreads and is accommodated in the accommodating concave portion 76a without any gap, so that the shock absorbing material 77 is prevented from shifting.

20 to 23 show an embodiment of a vehicle seat according to claims 12 to 14. FIG.
In the seat 81 of the above embodiment, the shock absorbing material 83 is embedded in the central portion of the cushion body 82. In this way, by embedding the shock absorbing material 83 in the sheet 81, the shock absorbing material 8
3 has a structure that is not easily affected by solar heat, engine heat, and low outside air temperature in winter, and prevents the performance of the shock absorber 83 from being damaged by heat.

In the seat 81 of the embodiment shown in FIG. 21, the shock absorbing material 83 arranged inside the bottom plate 84 is used as the heat insulating material 8.
Wrapped in 5. In this way, by wrapping the shock absorbing material 83 with the heat insulating material 85, the shock absorbing material 83 has a structure that is less susceptible to the effects of solar heat, engine heat, and low outside air temperature in winter. The performance of 83 is prevented from being damaged by the influence of heat.

In the sheet 81 of the embodiment shown in FIG. 22, the heat insulating material 87 is put under the sheet skin 86, and the heat insulating material 87 is arranged on the upper portion of the sheet 81.
The heat insulating material 88 is provided below the bottom plate 84, and the heat insulating material 88 is arranged at the bottom of the seat 81. in this way,
The heat insulating materials 87 and 88 are arranged on the top or bottom of the seat 81 so that the shock absorbing material 83 is not easily affected by solar heat, engine heat, and low temperature outside air in winter. The performance of is prevented from being damaged by the influence of heat.

FIG. 24 shows an embodiment of a vehicle seat according to claim 15. FIG. 24A is a sectional view showing a state in which a sheet is manufactured, and FIG. 24B is a sectional view of the sheet. As shown in FIG. 24 (a), the seat 90 has a cushion material 9 in which the impact absorbing material 93 is put in the molding dies 91 and 92.
4 is foamed, and the cushion material 94 and the shock absorbing material 9 are formed.
3 is bonded and manufactured.

As described above, the sheet 90 is formed by the molding dies 91,
The cushioning material 94 is foamed by putting the shock absorbing material 93 in 92, and the cushioning material 94 and the shock absorbing material 93 are adhered to each other. As shown in FIG. It is possible to reduce the transmission of vibrations to the seated person by applying tension to 93 to increase elasticity, and to mitigate the impact force applied to the seated person's buttocks due to unevenness of the road or rapid acceleration / deceleration.

The shock absorbing material used in the vehicle seat of the present invention uses a super soft urethane elastomer as a matrix resin, and resin micro balloons 1 to 5 therein.
% (Wt%) mixed viscoelastic body.

The super soft urethane elastomer used as the matrix resin in the impact absorbing material is, for example,
A mixture of polyether polyol, polyester polyol, triallyl isocyanate, MDI (diphenylmethane diisocyanate) / TDI (tolylene diisocyanate) prepolymer, tin catalyst, phthalic acid plasticizer, etc., JP-B-3-17848 A novel urethane resin described in the publication (Applicant Iida Sangyo Co., Ltd.), a super-soft elastomer composition described in JP-A-3-37217 (Applicant Japan Automation, etc.), and the like, It is a urethane elastomer having a hardness of 15 or less according to Asker C hardness meter, which is a durometer for measuring the hardness of a soft material manufactured by Kobunshi Keiki Co., Ltd.

The resin-made microballoons mixed in the matrix resin in the impact absorbing material are made of vinylidene chloride resin (vinylidene chloride acrylonitrile copolymer) outer shell (average particle size 40 to 60 microns, particle size range 10 to 1).
Butene gas is included in (00 micron), and it is a product having a trade name of EXPANCEL DE (made by Sweden EXPANCEL Co., Ltd.), which is generally commercially available as a filler having a low specific gravity. .

When a resin-made microballoon is mixed with the super soft urethane elastomer (in this embodiment,
Iro Sangyo Co., Ltd. product name Orotex U1003 is used as an ultra-soft urethane elastomer, and Sweden Expancel Co. product name Expancel DE is mixed as a resin micro balloon), and a resin micro balloon for urethane elastomer If the mixing amount (% by weight) is less than 1%, it will be separated into two layers after casting and curing. If the mixing amount (% by weight) is 5% or more, the viscosity after mixing will be high and air will enter during casting. Will be lost.

As described above, in the shock absorbing material in which the resin-made microballoons are mixed with the super soft urethane elastomer,
As shown in FIG. 28, the loss coefficient increases with the amount of resin microballoons mixed, and the adhesiveness is lower than that of the super-soft urethane elastomer itself. Compared with other viscoelastic shock absorbers used, it is lighter (specific gravity 0.6
2) The impact resilience is small (the impact resilience rate is 8%), the change in hardness due to temperature change is small, and the fit is good.

Regarding the fit of the shock absorbing material, it has been conventionally difficult to give an objective numerical value only by performing a sensory evaluation based on the sensation of the passenger. We thought that it would be better to fit the entire part with less flexure and to receive it firmly, and to hit the ischium part that becomes convex when sitting, so we evaluated the fit by the following test method.

That is, as shown in FIG. 25, AGS500A autograph (tensile / compression tester) manufactured by Shimadzu Corporation
Is used as a test device and has a diameter of 100 mm and a thickness of 2
For each sample of 0 mm, as shown in FIG. 26 (A), a pressing jig A having a cylindrical portion 210 having a diameter of 30 mm and a tip portion 220 having a hemispherical shape, and having a diameter of 1 as shown in FIG. 26 (B).
Each of them is set on the autograph by the pressing jig B whose 00 mm disc portion 230 serves as the pressing surface, and (1) the load is applied to the sample by the pressing jig A, and the load (X value) when the bending amount becomes 10 mm. (2) A load is applied to the sample with the pressing jig B, and the load (Y value) when the amount of flexure reaches 10 mm is measured. = Y / X. Meanwhile, FIG.
The AGS500A autograph (tensile / compression tester) manufactured by Shimadzu Corporation shown in Fig. 5 was used as a test device, and the diameter was 30 mm and the thickness was 20 mm. As shown in FIG. 27, each sample of No. 1 is set on an autograph while being sandwiched and adhered between jig C and jig D having disk portions 240 and 250 each having a diameter of 30 mm, and (1) the sample is set to 2 mm. Compress and measure the spring constant (x1) at that time, (2) pull the sample by 2 mm to measure the spring constant (x2) at that time, and (3) ratio p of the spring constant during compression and the spring constant during tension.
Is calculated as p = x1 / x2.

For each sample, the bench evaluation value F and the spring constant ratio p value of the fit measured by the above test, and the storage elastic modulus measured by a separate JIS K 6394 test are shown below. It is as shown in Table 1.

Each sample is as follows. A This Example (Brand name Orotex mixed with 3.0% by weight of Expancel DE) B Conventional urethane foam C Low-resilience urethane foam 1 (Dren 1) D Low-resilience urethane foam 2 (Dren 2) E Low Repulsion Urethane Foam 3 (Zulene 3) F Shock Absorption Urethane Foam (Polon) G Shock Absorption Urethane Foam (Orotex U100
3) H shock absorption urethane foam (Sorbocein)

[0096]

[Table 1] * The storage elastic modulus is measured by a test based on JISK6394. Each sample has a diameter of 100 mm and a thickness of 20 mm. An average strain of 10% and a strain amplitude of 1%. MPa (megapascal) in the table is 0.1019.
The value is equal to 72 kgf / mm. Further, the sensory evaluation of each sample when used as a shock absorbing material in a sheet is as shown in Table 2 below.

[0097]

[Table 2] * 1 Very bad 2 Poor 3 Normal 4 Good 5 Very good Fig. 29 is measured in Table 1 above on the coordinates with the bench evaluation value F of the fit feeling as the vertical axis and the spring constant ratio p as the horizontal axis. The results show the distribution state of each sample, and when this is also seen together with the sensory evaluation results in Table 2 above, the value of the ratio p of the spring constant during compression and the spring constant during tension is It is thought that a good fit can be obtained by selecting a material of 1.1 or more.

FIG. 30 shows the relationship between the storage elastic modulus in Table 1 and the impact feeling on the kidney in Table 2 above. From this, it can be seen that the storage elastic modulus is 0.22 MPa or less. If so, the impact on the kidney is considered to be small.

That is, as seen from the results of the respective tests as described above, the impact absorbing material of this example measured as sample A had a p value of 1.30 and a storage elastic modulus of 0.102 M.
It is Pa, and it can be seen from the above numerical values that the fit is good and the impact on the kidney is small.

The vehicle seat of the present invention is not limited to the motorcycle as described above, and is similarly applied to the vehicles shown in FIGS. 31 to 35. The jet propulsion device 100 of FIG. 31.
In the planing boat 101 equipped with the impact absorbing material 1 on the seat 102 on which the operator B can sit, and on the seating portion 102a of the operator B.
No. 03 is arranged to mitigate the impact force applied to the vicinity of the skeleton of the operator B due to waves or rapid acceleration / deceleration.

A small boat 2 equipped with the outboard motor 200 of FIG.
In 01, the impact absorbing material 203 is arranged in the seat 202a of the pilot B on the seat 202 on which the pilot B can sit, and similarly, the seat 204 on which the passenger C can sit is mounted on the seat 204 on which the passenger C can sit. A shock absorbing material 205 is arranged at the position to alleviate the impact force applied to the vicinity of the skeleton of the operator B due to waves or rapid acceleration / deceleration.

In the golf car 301 equipped with the engine 300 shown in FIG. 33, the seat 302 on which the operator D can sit is
The impact absorbing material 303 is arranged on the seating portion 302a of the operator D, and the impact force applied to the vicinity of the seat bone of the operator D is alleviated due to the unevenness of the running place.

In the small snowmobile 400 shown in FIG. 34, the operator E
The seat 401 on which the operator E can sit
The impact absorbing material 402 is arranged in a, and the impact force applied to the vicinity of the skeleton of the operator E due to the unevenness of the snow field is mitigated.

In the passenger car 500 of FIG. 35, the seat 501 on which the operator F can sit, the seat 501a of the operator F, and the seat 501b of the backrest are provided with the shock absorbers 502, 503.
Are arranged to mitigate the impact force applied to the vicinity of the skeleton of the operator F or the vicinity of the pelvis and the lumbar vertebra due to unevenness of the road or rapid acceleration / deceleration.

Further, the vehicle seat of the present invention is similarly applied to vehicle seats for trucks, buses, airplanes and the like.

[0106]

As described above, according to the first aspect of the invention, since the relationship between the thickness of the seat and the thickness of the shock absorbing material is defined, it is possible to reduce the transmission of vibration to the seated person, and
It is possible to reduce the impact force applied to the vicinity of the seat bone of the seated person.

According to the second aspect of the present invention, since the concave portion is not formed in the portion where the seat pressure is high and the concave portion is formed in the portion where the seat pressure is low, the impact absorber has a simple structure. The height can be adjusted.

According to the third aspect of the present invention, since the recess is formed in the shock absorbing material and the diameter of the recess is changed from the upper side to the lower side, the elasticity changes as the seat sunk amount changes, and the sitting comfort is improved. To do.

According to the fourth aspect of the present invention, by forming a recess in the shock absorbing material and changing the density or diameter of the recess according to the seat pressure distribution, for example, displacement when seated can be prevented,
Improves sitting comfort.

According to the fifth aspect of the present invention, since the upper portion of the shock absorbing material is formed into a convex curved surface when viewed from the vehicle width direction, the fitting feeling is improved by matching the outer contour of the seat with the convex shape of the saddle riding shape. .

According to the sixth aspect of the present invention, since the upper portion of the shock absorber is formed into a concave curved surface when viewed from the vehicle width direction, lateral displacement in the vehicle width direction is prevented by vibration of the vehicle or the like.

According to the seventh aspect of the invention, since the thickness of the shock absorbing material is changed in the front-rear direction of the vehicle, the displacement of the vehicle in the front-rear direction can be prevented by vibration of the vehicle or the like.

According to the eighth aspect of the present invention, since the bumps having the inclined surface in the front or rear direction of the vehicle are formed on the upper portion of the shock absorbing material, the displacement in the front-rear direction of the vehicle due to vibration of the vehicle is prevented. .

According to the ninth aspect of the invention, since the uneven portion is provided in the portion of the seat on which the shock absorbing material is placed, the unevenness increases the bending amount of the shock absorbing material and reduces the transmission of vibration to the seated person. It is possible to reduce the impact force applied to the vicinity of the seat bone of the seated person due to the vibration of the vehicle.

According to the tenth aspect of the present invention, since the portion of the seat on which the impact absorbing material is placed is made elastic, the transmission of the vibration to the seated person due to the vibration of the vehicle is reduced, and the vibration of the vehicle causes the seated person to feel the vibration. It is possible to reduce the impact force applied to the vicinity of the ischium.

According to the eleventh aspect of the present invention, since the shock absorbing material is placed in the storage recess of the seat and the seat is clamped and fixed to the bottom plate, the shock absorbing material is pushed and spreads and stored in the storage recess without any gap. The shock absorber is prevented from shifting.

According to the twelfth aspect of the present invention, since the impact absorbing material is embedded in the sheet to make the impact absorbing material less susceptible to the influence of heat, the performance of the impact absorbing material is impaired by the influence of heat. Can be prevented.

According to the thirteenth aspect of the present invention, since the shock absorbing material is wrapped with the heat insulating material so that the shock absorbing material is less susceptible to heat, the performance of the shock absorbing material is prevented from being impaired by heat. can do.

According to the fourteenth aspect of the present invention, a heat insulating material is arranged at the top or bottom of the sheet so that the shock absorbing material is not easily affected by heat, or the performance of the shock absorbing material is impaired by heat. Can be prevented.

According to the fifteenth aspect of the present invention, in the seat, since the shock absorbing material is put in the molding die to foam the cushion material and the cushion material and the shock absorbing material are adhered, the shock absorbing material is applied by the load applied to the seat. Tension acts on and elasticity increases,
It is possible to reduce the transmission of vibrations to the seated person, and to reduce the impact force applied to the seated person's skeleton vicinity due to the vibration of the vehicle or the like.

According to a sixteenth aspect of the present invention, the shock absorbing material is
The resin-made microballoons are mixed in the ultra-soft urethane elastomer that serves as the matrix resin, and the impact-absorbing material structure reduces the adhesiveness of the shock-absorbing material that uses ultra-soft urethane elastomer with high adhesiveness as the matrix resin. As a result, the handling becomes easy, and the work of assembling the shock absorber on the sheet becomes easy.

According to a seventeenth aspect of the invention, the shock absorbing material is
The resin-made microballoons are mixed in an amount of 1 to 5% (% by weight) with respect to the super-soft urethane elastomer, and the mixture of the super-soft urethane elastomer and the resin-made microballoons is separated into two layers after casting and curing. Also, there is no possibility that air will enter during casting because of its high viscosity.

In the eighteenth aspect of the present invention, the shock absorbing material is
The ratio of the spring constant during compression to the spring constant during tension (spring constant during compression / spring constant during tension) is 1.1 or more, the storage elastic modulus is 0.22 MPa or less, and the shock absorbing material is a sheet. The weight increase when assembled to the seat is reduced, the fit when seated is improved, and the seating comfort is improved.

According to the nineteenth aspect of the invention, since the arrangement of the shock absorbing material on the backrest is defined, the shock force applied to the seated person's pelvis and the vicinity of the lumbar spine can be alleviated by rapid acceleration / deceleration.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle with a driver onboard.

FIG. 2 is a cross-sectional view showing an example of a vehicle seat according to claim 1.

FIG. 3 is a plan view of the sheet of FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a diagram showing sitting comfort characteristics.

FIG. 6 is a side view of the scooter type motorcycle in a state where the driver gets on the vehicle.

FIG. 7 is a cross-sectional view of a seat back portion.

FIG. 8 is a diagram showing a shock absorbing material of a backrest portion.

FIG. 9 is a cross-sectional view showing an embodiment of the vehicle seat according to claim 2;

FIG. 10 is a view showing a vehicle seat according to claim 3;

FIG. 11 is a view showing an example of a vehicle seat according to claim 4;

FIG. 12 is a cross-sectional view showing an example of a vehicle seat according to claim 5;

FIG. 13 is a sectional view showing an embodiment of a vehicle seat according to claim 6;

FIG. 14 is a cross-sectional view showing an embodiment of the vehicle seat according to the invention.

FIG. 15 is a cross-sectional view showing an embodiment of the vehicle seat according to claim 7;

FIG. 16 is a view showing an example of a vehicle seat according to claim 8;

FIG. 17 is a sectional view of a portion of a shock absorbing material showing an embodiment of a vehicle seat according to claim 9;

FIG. 18 is a sectional view of a portion of a shock absorbing material showing an embodiment of a vehicle seat according to claim 10;

FIG. 19 is a diagram showing an example of a vehicle seat according to claim 11;

FIG. 20 is a cross-sectional view showing an embodiment of the vehicle seat according to claim 12;

FIG. 21 is a sectional view showing an embodiment of the vehicle seat according to claim 13;

FIG. 22 is a cross-sectional view showing an example of the vehicle seat according to claim 14;

FIG. 23 is a cross-sectional view showing an example of the vehicle seat according to claim 14;

FIG. 24 is a view showing an example of the vehicle seat according to claim 15;

FIG. 25 is a schematic diagram showing an apparatus for testing a sample of shock absorber.

26 (A) Pushing jig A, (B) used to measure the amount of deflection of the sample with the test device shown in FIG. 25.
It is a side view which shows each pushing jig B.

FIG. 27 is a side view showing jigs C, Jigs D, and samples adhered to the jigs, which are used to measure the spring constants of the sample under compression and tension with the test apparatus shown in FIG. 25.

FIG. 28 is an explanatory diagram showing the relationship between the blending amount of resin microballoons in the impact absorbing material and the loss coefficient.

FIG. 29 is an explanatory diagram showing a distribution state of each impact absorbing material sample on a coordinate with a bench evaluation value F of a fit feeling as a vertical axis and a spring constant ratio p as a horizontal axis.

FIG. 30 is an explanatory diagram showing a distribution state of each impact absorbing material sample on a coordinate in which the vertical axis is the feeling of impact on the buttocks and the horizontal axis is the storage elastic modulus.

FIG. 31 is a side view of a planing boat including a vehicle seat.

FIG. 32 is a side view of a small boat including a vehicle seat.

FIG. 33 is a side view of a golf car including a vehicle seat.

FIG. 34 is a side view of a small snow vehicle including a vehicle seat.

FIG. 35 is a side view of a passenger vehicle including a vehicle seat.

[Explanation of symbols]

 10 seat 10a seating portion 15 shock absorbing material A driver

Claims (19)

[Claims] 1. A seat which can be seated by a seated person, a shock absorbing material is arranged in the seating portion of the seated person, the thickness of the seat is set to H0, the thickness of the shock absorbing material is set to H1, and the thickness of the seat is set. The thickness H obtained by subtracting the thickness H1 of the shock absorbing material from H0
2 and 20 <H0 <90 (mm), 5 <H1 <20 (mm), and 0.125 <H1 / H2 <1 0.1 <H1 / H0 <0.5. A vehicle seat characterized by the above. 2. A seat which can be seated by a seated person is provided with a shock absorbing material at the seating portion of the seated person, and a recessed portion is not formed at a portion where the seat pressure of the shock absorbing material is high so that the seating pressure is low. A vehicle seat having a recess formed in a portion thereof. 3. An impact absorbing material is arranged in a seating portion of a seated person on a seat on which the seated person can be seated, a recess is formed in the impact absorbing material, and the diameter of the recessed portion is changed from upper to lower. A vehicle seat characterized by. 4. A seat which can be seated by a seated person, wherein a shock absorbing material is arranged at a seating portion of the seated person, and a recess is formed in the shock absorbing material to change a density or a diameter of the recessed portion. Vehicle seat. 5. A seat which can be seated by a seated person, a shock absorbing material is arranged at a seating portion of the seated person, and an upper portion of the shock absorbing material is formed into a convex curved surface when viewed in the vehicle width direction. A vehicle seat to be used. 6. A seat which can be seated by a seated person, wherein a shock absorbing material is arranged at the seating portion of the seated person, and the upper part of the shock absorbing material is formed into a concave curved surface when viewed from the vehicle width direction. Vehicle seat. 7. A vehicle seat characterized in that a shock absorbing material is arranged on a seating portion of a seated person, and the thickness of the shock absorbing material is changed in the longitudinal direction of the vehicle. . 8. A seat on which a seated person can sit, a shock absorbing material is arranged at a seating portion of the seated person, and an unevenness having an inclined surface in a front or rear direction of a vehicle is formed on an upper portion of the shock absorbing material. A vehicle seat characterized by the above. 9. A seat for a vehicle, comprising: a seat on which a seated person can be seated, an impact absorbing material being arranged at a seating portion of the seated person, and a concavo-convex portion provided at a portion of the seat where the impact absorbing material is placed. . 10. A vehicle seat comprising a seat on which a seated person can be seated, an impact absorbing material being arranged at a seating portion of the seated person, and elasticity being given to a portion of the seat where the shock absorbing material is placed. 11. A seat that can be seated by a seated person is provided with a shock absorbing material at the seating portion of the seated person, and the seat has a storage recess at a portion where the shock absorbing material is placed on a cushion body.
The shock absorbing material is made thicker than the storage recess to form a tightening margin, and a peripheral portion of the shock absorbing material is made smaller than the storage recess as an escape portion to form a gap. A vehicle seat characterized in that it is constructed by pressing and fixing a shock absorbing material. 12. A vehicle seat, comprising a seat on which a seated person can sit, a shock absorbing material disposed on a seating portion of the seated person, and the shock absorbing material embedded in the seat. 13. A vehicle seat characterized in that a shock absorbing material is arranged on a seating portion of a seated person, and the shock absorbing material is wrapped with a heat insulating material in a seat on which the seated person can sit. 14. A vehicle seat comprising a seat on which a seated person can sit, a shock absorbing material being arranged on a seating portion of the seated person, and a heat insulating material being arranged on an upper portion or a bottom portion of the seat. 15. A seat that can be seated by a seated person is provided with a shock absorbing material at the seating portion of the seated person. The seat is formed by inserting the shock absorbing material into a cushioning material and foaming the cushioning material. A vehicle seat, characterized in that it is configured by adhering a material and the shock absorbing material. 16. The vehicle seat according to any one of claims 1 to 15, wherein the shock absorbing material is a resin-made microballoon mixed in an ultra-soft urethane elastomer serving as a matrix resin. . 17. The shock absorbing material comprises resin microballoons in an amount of 1 to 5% based on the super soft urethane elastomer.
17. The composition according to claim 16, wherein (% by weight) is mixed.
The vehicle seat described in. 18. The shock absorbing material has a ratio of a spring constant in compression to a spring constant in tension (spring constant in compression / spring constant in tension) of 1.1 or more and a storage elastic modulus of 0. ．
22 MPa or less, The vehicle seat of Claim 16 or Claim 17 characterized by the above-mentioned. 19. A shock absorbing material is arranged in a seating portion of a seat having a backrest portion on which a seated person can sit, and the shock absorbing material is arranged in the seatback portion at least in a range of a vertical upward distance of 80 to 180 mm from the seating portion. A vehicle seat characterized by having