JP2000168419A - Shock absorber of seat for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively relax an impact force when the impact force is imparted from a vehicle body side to a seated person through a seat, to keep a sense of unity with vehicle well and to maintain a comfortability to ride on the vehicle well. SOLUTION: A super-absorptive elastic body 21 is disposed in the inside of a seat 5. A storage modulus of elasticity of the super-absorptive elastic body 21 is made smaller than that of a pad 13 constituting the inside of the seat 5 and a loss modulus of elasticity of the super-absorptive elastic body 21 is made larger than that of the pad 13. A general elastic body 22 is disposed so as to horizontally arrange it with the super-absorptive elastic body 21 in the inside of the seat 5. When independent external forces are applied such that shrinkage quantities of a presumed pad having outer shape coincident with an outer shape dimension of the general elastic body 22 and having the same material as the pad 13 are the same, the external force to the general elastic body 22 becomes larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing device for a vehicle seat such as a motorcycle or a motor vehicle such as a scooter, a land vehicle such as a small snow vehicle, a watercraft such as a watercraft, and a high-speed ship. It is.

[0002]

2. Description of the Related Art A conventional vehicle seat cushioning device is disclosed in Japanese Patent Application Laid-Open No. 2-286481.

According to the above publication, a motorcycle, which is a kind of land vehicle, is provided with a seat such as a vehicle body frame supported on a vehicle body side. Further, the seat includes a seat bottom plate that forms a bottom portion thereof and is supported on the vehicle body side, an elastic pad that forms an interior of the seat and is supported on an upper surface side of the seat bottom plate, A flexible outer skin that constitutes an outer shell and covers the pad from outside.

[0004] A buffer device is provided on the seat.
This shock absorbing device includes a superabsorbent elastic body provided inside the sheet, and the superabsorbent elastic body is a viscous body having soft elasticity and a large viscosity coefficient.

[0005] For this reason, when the motorcycle jumps due to large unevenness of the road surface during running of the motorcycle, or when the vehicle subsequently lands, for example, due to the inertia force of the occupant seated on the seat, the seating force is reduced. When an impact force that is directed upward from the vehicle body side through the seat is applied to the rider, the energy based on the impact force is extremely effectively absorbed by the elastic deformation of the superabsorbent elastic body. And is attenuated.

Accordingly, the impact force applied to the occupant from the vehicle body is more reliably reduced, and the occupant is prevented from being vibrated based on the impact force. The sitting comfort is kept good.

[0007] Also, when the vehicle is a water vehicle,
This is the same as above, that is, when the vehicle jumps due to a large wave during traveling, and then comes into contact with water, etc. It is effectively absorbed by the device.

[0008]

However, the above-mentioned conventional technology has the following problems.

That is, as described above, when an impact force is to be applied from the vehicle main body side to the occupant through the seat, the superabsorbent elastic body is soft. It is elastically deformed so that it contracts greatly, and the impact force is effectively alleviated.
As the superabsorbent elastic body is released from the impact force, it tends to restore its original shape by its elastic force.

[0010] However, as described above, since the viscosity of the superabsorbent elastic body is large, it takes time to restore to the original shape. Therefore, the occupant may be in a state of sinking below a normal sitting position. The vehicle is left unattended for a long time, and during this period, the field of view is reduced, so that the occupant may lose his or her usual sense of unity with the vehicle, which may cause a decrease in riding comfort.

The present invention has been made in view of the above circumstances. When an impact force is applied from a vehicle body side of a vehicle to a seated person via a seat, the impact force is effective. It is an object of the present invention to make it possible to moderately relax the vehicle, to maintain a good sense of unity with the vehicle, and to maintain a comfortable ride on the vehicle.

[0012]

The vehicle seat cushioning device of the present invention for solving the above-mentioned problems is as follows.

According to the first aspect of the present invention, as shown in all the drawings, the seat 5 comprises a seat bottom plate 12 which constitutes a bottom portion thereof and is supported on the vehicle body 2 side, and an interior of the seat 5. An elastic pad 13 supported on the upper surface of the seat bottom plate 12, and a flexible skin 14 forming an outer shell of the seat 5 and covering the pad 13 from the outside thereof, In the vehicle seat cushioning device in which the super absorbent elastic body 21 is disposed,

The superabsorbent elastic body 21 has a storage elastic modulus smaller than that of the pad 13, and the superabsorbent elastic body 2
1 is larger than the above-mentioned pad 13,

A general elastic body 22 is disposed inside the sheet 5 so as to be lined with the superabsorbent elastic body 21 in the horizontal direction.
A virtual pad 29 having an outer shape substantially matching the outer dimensions of the general elastic body 22 and made of the same material as the pad 13, and external forces F 1 and F 2 independent of each other so that the general elastic body 22 has the same contraction amount. When applied, the external force applied to the general elastic body 22 is made larger.

According to a second aspect of the present invention, as shown in all the drawings, in addition to the first aspect of the present invention, a cavity 16 is formed inside the sheet 5 and the superabsorbent elastic material is formed in the cavity 16. The body 21 and the general elastic body 22 are housed together.

According to a third aspect of the present invention, as shown in FIGS. 1 to 9, in addition to the first or second aspect of the present invention, the general elastic body 22 is a coil spring 26 whose axis 25 is vertically oriented. The super-absorbent elastic body 21 is provided in an inner space 27 of the spring 26.

According to a fourth aspect of the present invention, as shown in FIGS. 1 to 9, in addition to the third aspect of the present invention, an outer shape substantially matching the outer size of the superabsorbent elastic body 21 is obtained from the virtual pad 29. Another virtual pad 3 from which the virtual volume 38 is removed
9 is provided with the external force F1.

[0019]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment)

FIGS. 1 to 9 show a first embodiment.

2 to 4, reference numeral 1 denotes a vehicle, and more specifically, a motorcycle which is a straddle-type vehicle. The arrow Fr in the figure indicates the front of the vehicle 1.

The vehicle 1 includes a frame 3 that constitutes a part of the vehicle main body 2, a wheel 4 supported by the frame 3 of the vehicle main body 2 and supporting the vehicle main body 2 on a traveling road surface, Sheet 5 supported by main body 2
, A fuel tank 6, and an engine for driving the wheels 4 (not shown).

A driver 7 and a occupant 8 who is a passenger are seated on the seat 5. In this case, a front portion of the seat 5 is a main seat 9 on which a seated person 8 as a driver 7 is seated, and a rear portion is a tandem seat 10 on which another seated person as a passenger is seated.
And the tandem sheet 10 are integrally formed.

The seat 5 comprises a rigid seat bottom plate 12 which is a seat pan which constitutes a bottom portion and is supported on the upper surface of the frame 3 of the vehicle body 2,
And an elastic and flexible skin 13 which constitutes the inside of the seat 5 and is supported on the upper surface of the seat bottom plate 12 and an elastic and flexible skin which constitutes the outer shell of the seat 5 and covers the pad 13 from above. It has.

The seat bottom plate 12 is made of resin or sheet metal, and the pad 13 is made of urethane foam made of a porous resin, which is not viscous.
The skin 14 is formed of a resin sheet such as vinyl chloride or an olefin elastomer. The pad 13 is elastically deformed to improve the sitting comfort of the occupant 8 on the seat 5, and the skin 14 protects and waterproofs the internal pad 13 and a cushioning device 17 described below.
Has a function of applying a preload (including 0) to the sheet to suppress elongation and maintain the sheet 5 in a predetermined shape.

Referring to FIGS. 1 to 5, a plurality of shock absorbers 17 are provided from the vehicle main body 2 for reducing the impact force and vibration applied to the seated person 8 sitting on the seat 5 via the seat 5. Is provided. The shock absorbers 17 are provided with a plurality (four) of hollow portions 16 on the right and left and right and left sides of the pad 13 of the main seat 9 inside the seat 5 before and after opening downward. Each of the shock absorbers 17 may be applied to the tandem seat 10, and two of the four shock absorbers 17 on the front side are used for the main sheet 9, and two on the rear side are used for the tandem seat 10. It may be used. Further, the main sheet 9 and the tandem sheet 10 may be formed separately from each other, and each may incorporate a plurality of shock absorbers 17.

Each of the shock absorbers 17 is made of a flat plate made of sheet metal or resin and is opposed to each other in the vertical direction A, that is, in a substantially vertical direction. And a super-absorbent elastic body 21 and a general elastic body 22 provided between the first and second members 19 and 20. The first and second members 19 and 20, the superabsorbent elastic body 21, and the general elastic body 22 are all housed integrally in the cavity 16, and the first member 19 is
6, the second member 20 is placed on and supported by the upper surface of the seat bottom plate 12 which is the bottom surface of the cavity 16.

The superabsorbent elastic body 21 has a shape that can be formed easily and inexpensively by extrusion molding, casting molding, injection molding, or the like. More specifically, the axis 24 is substantially vertical. It has a cylindrical shape that extends linearly, and is made by mixing resin microballoons in an ultra-soft urethane elastomer serving as a matrix resin, has a small spring constant (elastic coefficient), has soft elasticity, and It is a viscous body having a large viscosity coefficient.

In the above case, the super-absorbent elastic body 21 has a storage elastic modulus smaller than that of the pad 13,
The loss elastic coefficient of the superabsorbent elastic body 21 is equal to that of the pad 1
3, when the superabsorbent elastic body 21 receives an external impact force, the energy based on the impact force is more fully absorbed than the pad 13 and The power is effectively relieved.

As shown in FIG. 6, the superabsorbent elastic body 2
1 is that the loss coefficient is increased as the content of the resin microballoon is increased, whereby the amount of energy contraction based on the impact force is increased, that is, the effect of reducing the impact force and vibration is reduced. Has been enhanced. Note that the super-absorbent elastic body 21 does not have to include microballoons.

In FIG. 1 to FIG.
Is formed of a coil-shaped metal spring 26 whose axis 25 extends linearly in a substantially vertical direction which is the vertical direction A, and the spring 26 is elastically deformable in the vertical direction A. . The general elastic body 22 includes:
Compared with the pad 13 and the superabsorbent elastic body 21, each has a large spring constant (elastic coefficient) and hard elasticity, but does not have viscosity.

The superabsorbent elastic body 21 and the general elastic body 22
Are arranged side by side in the horizontal direction perpendicular to the vertical direction A. More specifically, in a plan view of the vehicle 1, the general elastic body 22 has a circular ring shape, and the superabsorbent elastic body 21 is disposed in an inner space 27 of the general elastic body 22. The axes 24 and 25 of the superabsorbent elastic body 21 and the general elastic body 22 are located substantially coaxially with each other.

The superabsorbent elastic body 2 in the vertical direction A
Each end of 1 is fixed to the first and second members 19 and 20 by an adhesive, respectively. In addition, the vertical direction A
Each end of the general elastic body 22 is also the first and second members 1
9 and 20 are fixed to each other by fixing tools 28.
The fixing tool 28 is constituted by a cut and raised piece formed by cutting and raising a part of the first and second members 19 and 20, and the cut and raised piece is pressed against each end of the spring 26. Each end is fixed as described above.

The fixing of each end of the superabsorbent elastic body 21 to the first and second members 19 and 20 and the fixing of each end of the general elastic body 22 may be only one of them.

According to the above configuration, the storage elastic modulus of the superabsorbent elastic body 21 is made smaller than that of the pad 13, and the loss elastic modulus of the superabsorbent elastic body 21 is smaller than that of the pad 13. Therefore, when the superabsorbent elastic body 21 receives an impact force from the outside, the energy based on the impact force is more sufficiently absorbed than the pad 13 and the impact force is effectively reduced. Is done.

Therefore, when an impact force is applied to the shock absorber 17 in the vertical direction A from the vehicle body 2 while the vehicle 1 is traveling, the elastic members 21 and 22 of the shock absorber 17 are provided. Are elastically deformed so as to shrink together to relieve the impact force, and in particular, because the superabsorbent elastic body 21 is a viscous body having a softer elasticity than the pad 13 and a large viscosity coefficient. The energy based on the impact force is extremely effectively absorbed by the elastic deformation of the superabsorbent elastic body 21 and the conversion to the heat energy.

Therefore, the impact force applied from the vehicle body 2 side of the vehicle 1 to the occupant 8 seated on the seat 5 of the vehicle 1 is effectively reduced by the shock absorbing device 17, and It is also prevented that the seated person 8 is vibrated based on the impact force.

In the above case, a gap is provided between the super-absorbent elastic body 21 and the general elastic body 22, and the gap causes the super-absorbent elastic body 21 and the general elastic body 22 to be elastic. When deformed, they are prevented from contacting each other due to the gap, so that the respective elastic deformations are smoothly performed.

7 and 8, the spring constant k of the general elastic body 22 as compared with the pad 13 is k = F (external force) / △ L.
The magnitude of the (shrinkage amount) and the initial state when the general elastic body 22 is installed on the sheet 5 are determined as follows.

In FIG. 7, virtual pads 29 (a) and (b) having an outer shape substantially matching the outer size (diameter size) of the general elastic body 22 and made of the same material as the pad 13 are set. .

7 and 8, the virtual pad 29
(A) (or the virtual pad 29 (b)) and the amount of contraction ΔL of the general elastic body 22 (a) (or the general elastic body 22 (b)) are set in the initial state (FIG. 8). 0) so that the same value X is obtained from the virtual pad 2
9 (a) (or the virtual pad 29 (b)) and the general elastic body 22 (a) (or the general elastic body 22 (b)), when external forces F1 and F2 independent of each other are applied, the general elastic body 22 It is assumed that the external force F2 is larger, that is, the external force F1 (a) <external force F2 (a) (or the external force F1 (b) <external force F2 (b)). F1 and F2 correspond to the elastic reaction force (elastic force) generated in each of the general elastic bodies 22 and the virtual pad 29.

In the above case, the spring constant of the general elastic body 22 is larger than that of the virtual pad 29 (a). In this case, as shown in FIG. 8, the general elastic body 22 (a) ), The general elastic body 22 (a) has a free length (L). Therefore, when the external forces F1 (a) and F2 (a) are applied to the general elastic body 22 (a) and the virtual pad 29 (a) so that the contraction amount ΔL becomes the same value X as each other. , The external force F1
(A) <External force F2 (a) is obtained.

The spring constant of the general elastic body 22 is
When the virtual pad 29 (b) is larger, the general elastic body 22 is made longer (L + L0) than the free length (L) by a certain additional length (L0), and this is set as the general elastic body 22 (b). In the initial state when the general elastic body 22 (b) is placed on the sheet 5, the above (L0) is set to correspond to the initial amount of contraction ΔL.
Assume that an initial external force F2 (0) is applied to (b). Then, the general elastic body 22 (b) and the virtual pad 2
When the external forces F1 (b) and F2 (b) are applied to the respective external forces F1 (b) and F2 (b) so that the external force F1 (b) and the external force F2 (b) become the same value X of the contraction amount ΔL with each other. Is obtained.

In FIG. 8, when the contraction amount ΔL = L1, the seat 5 is normally seated on the seat 5, and when the contraction amount ΔL = L2, the seat 5 When the impact force is relatively applied, the contraction amount ΔL = L3 indicates that the contraction amount ΔL is maximum and the general elastic body 22 cannot contract any more.

Here, the cushioning device 17 of the sheet 5 is
Assuming a virtual pad 29 having an outer shape almost identical to that of the general elastic body 22 and made of the same material as the pad 13, the pad 13 of the sheet 5 having a shape and a size corresponding to the virtual pad 29 is assumed. It is considered that the above-mentioned general elastic body 22 is used instead of a part of the above, and therefore, the following operation and effect occur.

That is, when the impact force is reduced by the superabsorbent elastic body 21 of the shock absorber 17, when the superabsorbent elastic body 21 is released from the impact force, the superabsorbent elastic body 21 is released. Although it takes time to restore the original shape by itself due to its properties, the general elastic body 22 has a pad 13 whose general elastic body 22 substantially matches the shape thereof.
That is, the super-absorbent elastic body 21 is stretched in the vertical direction A in order to immediately restore the original shape by a larger elastic reaction force than in the case of the virtual pad 29.

Therefore, when the shock absorber 17 is released from the shock force after the shock force is relaxed as described above, the shock absorber 17 is quickly restored to the original shape, and the vehicle 1 and the seat 1 are seated. The relative position with respect to the person 8 can be quickly restored to the original state.

That is, when the shock absorbing device 17 is elastically deformed to contract in the vertical direction A by receiving the impact force, the occupant 8 sitting on the seat 5 sinks below the normal riding position. However, the quick restoration of the shock absorber 17 prevents the sinking state from being left for a long time in the sunk state, and quickly returns to the original riding posture.

Therefore, for the occupant 8, the field of view at the normal height is quickly restored, the sense of unity with the vehicle 1 is kept good, and the riding comfort on the vehicle 1 is kept good.

When the superabsorbent elastic body 21 is restored, the superabsorbent elastic body 21 generates heat and radiates heat due to internal friction due to its viscosity, thereby preventing the seated person 8 from jumping up. Note that the general elastic body 22 may be one that restores the superabsorbent elastic body 21 alone without tension.

The shock absorber 17 not only reduces the impact force, but also transmits the vibration to the driver 7 from the vehicle body 2 vibrated by the unevenness of the road surface or the engine by the super absorbent elastic body. The vibration is effectively prevented by the vibrating action of the viscosity of 21.

FIG. 9 shows the relationship between each superabsorbent elastic body 21 and general elastic body 22 of the cushioning device 17 in the seat 5 and the buttocks 34 of the occupant 8 seated on the seat 5.

The sheet 5 has a pair of left and right shock absorbers 1.
7 and 17 are provided.
The shock absorbers 17 are arranged such that the protrusions of the above are substantially located on the respective shaft centers 24 and 25.

Therefore, the impact force transmitted relatively between the seat 5 and the occupant 8 is directly applied to each of the shock absorbers 17. Therefore, the impact force is more reliably reduced.

According to the above configuration, the hollow portion 16 is formed inside the sheet 5, and the superabsorbent elastic body 21 and the general elastic body 22 are housed in the hollow portion 16.

Therefore, the volume of the cavity 16 can be reduced as compared with the case where the cavity 16 for individually storing the superabsorbent elastic body 21 and the general elastic body 22 is formed inside the sheet 5. Accordingly, the volume of the pad 13 can be increased.

Therefore, when the cushioning device 17 is provided, it is possible to suppress a reduction in the impact force and vibration reduction functions of the pad 13, and to maintain a comfortable ride on the vehicle 1.

The general elastic body 22 has an axis 25
Is a vertical coil spring 26, and the superabsorbent elastic body 21 is disposed in an inner space 27 of the spring 26.

Therefore, the space of the inner space 27 of the general elastic body 22 is effectively used, and the volume of the pad 13 can be increased accordingly.

Therefore, when the cushioning device 17 is provided, it is possible to suppress a reduction in the impact force and vibration mitigation functions of the pad 13, and the riding comfort to the vehicle 1 is further maintained.

As shown by a three-dot chain line in FIG. 7, another virtual pad 39 is obtained by removing a virtual volume 38 having an outer shape substantially matching the outer size of the superabsorbent elastic body 21 from the virtual pad 29. The external force F1 may be applied.

Here, as described above, the spring 26
When the superabsorbent elastic body 21 is disposed in the inner space 27 of the above, the inner space 27 is effectively used for disposing the superabsorbent elastic body 21, and the volume of the pad 13 can be increased accordingly. For this reason, as described above, when the reaction force of the general elastic body 22 is determined in comparison with another virtual pad 29 obtained by removing the virtual volume 38 from the virtual pad 29, this value includes a smaller one. The pad 1
The above-mentioned reaction force is sufficient for increasing the volume of 3.

Therefore, the general elastic body 22 can have a small spring constant to some extent, and the weight of the seat 5 can be reduced accordingly.

Although the above description is based on the illustrated example, the vehicle may be a straddle-type vehicle such as a three- or four-wheeled vehicle or a snow vehicle as a land vehicle, or a saddle-ride vehicle as a water vehicle. The boat may be a hydroplane or a high-speed boat.

The following figures show the second and third embodiments. Each of these embodiments has many points in common with the first embodiment in configuration and operation. Therefore, these common components are denoted by the same reference numerals in the drawings, and redundant description thereof will be omitted, and different points will be mainly described.

The vehicle 1 according to the first embodiment
Alternatively, various configurations of the components of the above-described embodiments may be combined, such as using the buffer device 17 of the second embodiment or later.

(Second Embodiment)

FIG. 10 shows a second embodiment.

According to this, the superabsorbent elastic body 21 has a cylindrical shape having a circular cross section, and the general elastic body 22 is disposed in the inner space 31 of the superabsorbent elastic body 21. For this reason, the inner space 31 is effectively used, and the shock absorber 17 is correspondingly compact.

(Third Embodiment)

FIG. 11 shows a third embodiment.

According to this, the superabsorbent elastic body 21 is disposed outside the general elastic body 22, and a slight gap 32 is provided between them. The gap 32 is formed between the superabsorbent elastic body 2 when the shock absorber 17 is given an impact force.
1 to absorb the elastic deformation.

According to the above configuration, the superabsorbent elastic body 2
1 and the general elastic body 22 can be easily prevented from interfering with each other, so that their shapes can be freely determined, and the degree of freedom in design is improved.

[0075]

The effects of the present invention are as follows.

In the shock absorber according to the first aspect of the present invention, the sheet
A seat bottom plate that forms the bottom thereof and is supported on the vehicle body side; an elastic pad that forms the interior of the seat and is supported on the upper surface of the seat bottom plate; and a pad that forms the outer shell of the seat And a flexible skin covering the outside from the outside, and a shock absorbing device for a vehicle seat in which a super absorbent elastic body is disposed inside the seat.

The storage elastic modulus of the superabsorbent elastic body is smaller than that of the pad, and the loss elastic modulus of the superabsorbent elastic body is larger than that of the pad.

Therefore, when an impact force is applied to the shock absorber during traveling of the vehicle, the respective elastic bodies of the shock absorber are elastically deformed so as to contract together to reduce the shock force. In particular, since the superabsorbent elastic body has a soft elasticity compared to the pad and is a viscous body having a large viscosity coefficient, the energy based on the impact force is:
It is absorbed very effectively by the elastic deformation of the superabsorbent elastic body.

Therefore, the shock force applied to the occupant seated on the vehicle seat from the vehicle body side of the vehicle is effectively reduced by the shock absorbing device, and the occupant is moved based on the impact force. Vibration is also prevented.

Further, a general elastic body is disposed inside the sheet so as to be arranged in a horizontal direction with the superabsorbent elastic body, and has an outer shape substantially matching the outer dimensions of the general elastic body, and is provided with the pad and When a virtual pad of the same material and the general elastic body give external forces independent of each other so as to have the same amount of contraction,
The external force applied to the general elastic body is made larger.

In other words, the cushioning device for a sheet corresponds to the virtual pad, assuming that the virtual pad is made of the same material as the pad, having an outer shape whose outer dimensions almost match the general elastic body as described above. It is considered that the above-mentioned general elastic body is used in place of a part of the pad of the sheet having the shape and size as described above, and therefore, the following effects occur.

After the impact force is relieved by the superabsorbent elastic body of the shock absorber, when the superabsorbent elastic body is released from the impact force, the superabsorbent elastic body alone becomes the original shape. Although it takes a long time to restore the shape, the general elastic body has a larger elasticity than the general elastic body, which is a pad whose shape almost matches this shape, that is, a virtual pad. The force immediately restores its original shape.

Therefore, when the shock absorber is released from the impact force after the impact force is reduced as described above,
The shock absorber is quickly restored to its original shape, and the relative position between the vehicle and the occupant is quickly restored to the original state.

That is, when the shock absorbing device is elastically deformed so as to contract in the vertical direction under the impact force, the occupant in the seat is in a state of sinking below the normal riding position. By the quick restoration of the shock absorber, it is possible to prevent the sunk state from being left for a long time, and to quickly return to the original riding posture.

Therefore, for the occupant, the field of view at the normal height is quickly restored, the sense of unity with the vehicle is kept good, and the riding comfort with this vehicle is kept good.

According to a second aspect of the present invention, a hollow portion is formed inside the sheet, and the superabsorbent elastic body and the general elastic body are housed in the hollow portion.

Therefore, the volume of the cavity can be reduced as compared with the case where a cavity for individually accommodating the superabsorbent elastic body and the general elastic body is formed inside the sheet, and accordingly, the pad can be reduced accordingly. The volume can be increased.

Therefore, when the cushioning device is provided, it is possible to suppress a reduction in the impact force and vibration mitigation functions of the pad, thereby maintaining a comfortable ride on a vehicle.

According to a third aspect of the present invention, the general elastic body is a coil spring whose axis is vertically oriented, and the superabsorbent elastic body is disposed in the space inside the spring.

For this reason, the space in the inner space of the general elastic body is effectively used, and the volume of the pad can be increased accordingly.

Therefore, when the cushioning device is provided, it is possible to suppress a reduction in the impact force and vibration reduction functions of the pad, and the riding comfort to the vehicle is further maintained.

According to a fourth aspect of the present invention, the external force is applied to another virtual pad obtained by removing a virtual volume having an outer shape substantially matching the outer size of the superabsorbent elastic body from the virtual pad.

Here, as described in the third aspect of the present invention, when the superabsorbent elastic body is disposed in the space inside the spring, the internal space is effective for disposing the superabsorbent elastic body. It can be used to increase the pad volume accordingly. Therefore, as described above, if the reaction force of the general elastic body is determined and determined in comparison with another virtual pad obtained by removing the virtual volume from the virtual pad, this value includes a smaller one. The reaction force is sufficient as the volume of the pad can be increased.

Therefore, the general elastic body can have a small spring constant to some extent, and the weight of the seat can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 is a partially enlarged cross-sectional view of FIG. 2 in a first embodiment.

FIG. 2 is a partial side view of a motorcycle as a vehicle according to the first embodiment.

FIG. 3 is a partial front sectional view of the first embodiment shown in FIG. 2;

FIG. 4 is a partial plan sectional view of the first embodiment shown in FIG. 3;

FIG. 5 is a partially enlarged partial cutaway view of FIG. 4 in the first embodiment.

FIG. 6 is a composition diagram of a superabsorbent elastic body according to the first embodiment.

FIG. 7 is a diagram showing a relationship between a general elastic body and a virtual pad in the first embodiment.

FIG. 8 is a diagram showing a relationship between a contraction amount of a general elastic body and an external force in the first embodiment.

FIG. 9 is a diagram more specifically showing FIG. 3 in the first embodiment.

FIG. 10 is a diagram corresponding to FIG. 1 in the second embodiment.

FIG. 11 is a diagram corresponding to FIG. 1 in the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle 2 Vehicle main body 3 Frame 5 Seat 7 Driver 8 Seated person 12 Seat bottom plate 13 Pad 14 Skin 16 Cavity part 17 Buffer device 19 First member 20 Second member 21 Superabsorbent elastic body 22 General elastic body 24 Axis 25 Axis 26 Spring 27 Inner space 28 Fastener 29 Virtual pad 31 Inner space 38 Virtual volume 39 Virtual pad A Vertical direction F External force △ L Shrinkage

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuaki Hamada 2500 Shinkai, Iwata-shi, Shizuoka Prefecture Yamaha Motor Co., Ltd. F-term (reference) 3B087 CE10 DD06 DD14 DD18 DD19

Claims (4)

[Claims] 1. A seat bottom plate, the bottom of which is supported on the vehicle body side; an elastic pad, which forms the inside of the seat and is supported on the upper surface of the seat bottom plate; A flexible outer skin that constitutes an outer shell and covers the pad from the outside, and a shock absorbing device for a vehicle seat in which a super-absorbent elastic body is disposed inside the seat; The storage elastic modulus of the body is smaller than that of the pad, and the loss elastic modulus of the superabsorbent elastic body is larger than that of the pad. Generally, the superabsorbent elastic body is arranged horizontally with the superabsorbent elastic body inside the sheet. An elastic body is provided, and a virtual pad having an outer shape substantially matching the outer dimensions of the general elastic body and made of the same material as the pad, and an external force independent of each other so that the general elastic body has the same amount of contraction. When given, above general Vehicle seat cushioning device towards the external force to be larger to sex body. 2. The vehicle seat cushioning device according to claim 1, wherein a cavity is formed inside the seat, and the superabsorbent elastic body and the general elastic body are both housed in the cavity. 3. The vehicle seat according to claim 1, wherein the general elastic body is a coil spring whose axis is vertically oriented, and the superabsorbent elastic body is disposed in a space inside the spring. Shock absorber. 4. The vehicle according to claim 3, wherein the external force is applied to another virtual pad from which a virtual volume having an outer shape substantially matching the outer size of the superabsorbent elastic body is removed from the virtual pad. Seat shock absorber.