JP6913620B2 - Seat pads, vehicle seats, and vehicle seat control methods - Google Patents

Description

The present invention relates to a seat pad, a vehicle seat, and a method for controlling a vehicle seat.

Conventionally, as a method of changing the vibration characteristics felt by the seated person of the vehicle seat while the vehicle is running, the opening area of the ventilation window of the pan frame provided on the back side of the cushion pad of the seat pad is changed by this. Some cushion pads change the air permeability (Patent Document 1). According to this method, the vibration transmissibility (resonance magnification) can be increased by increasing the air permeability, and the vibration transmissibility can be decreased by decreasing the air permeability.

Japanese Unexamined Patent Publication No. 2001-211956

However, the method of Patent Document 1 could hardly change the resonance frequency (resonance point).

On the other hand, as a method of changing the resonance frequency, a method of changing the hardness of the foam and thus the spring constant by changing the material and shape of the foam constituting the seat pad can be considered. However, while the required or preferred vibration characteristics vary depending on the type of vehicle body and the seated person, this method has the inconvenience that the foam itself needs to be replaced in order to change the vibration characteristics. rice field.

The present invention provides a seat pad, a vehicle seat, and a method for controlling a vehicle seat, which can change the resonance frequency of the seat pad without changing the foam itself constituting the seat pad. With the goal.

The seat pad of the present invention
A packaging pad portion having a foam and a breathable bag covering the foam is provided.
When the foam is not covered with anything, the packaging pad portion has the predetermined time than the time T0 from when the foam is decompressed in a predetermined compressed state to when the foam is restored to the state before compression. The time T1 required from the decompression in the compressed state to the restoration to the state before compression is longer.
According to the seat pad of the present invention, the resonance frequency of the seat pad can be changed without changing the foam itself constituting the seat pad.

In the seat pad of the present invention
It is preferable that the packaging pad portion is configured so that the recovery rate when 60 seconds have passed since the compression was released in the state of being compressed by 40% is 20% or less.
As a result, the resonance frequency can be changed more effectively.

In the seat pad of the present invention
It is preferable that a plurality of the packaging pad portions are laminated in the vertical direction.
As a result, the resonance frequency can be changed more effectively.

In the seat pad of the present invention
The bag body
A bag body made of non-breathable material and
A ventilation part that enables ventilation inside and outside the bag body,
It is preferable to have.
This simplifies the manufacture of the bag body.

In the seat pad of the present invention
It is preferable that the ventilation portion is connected to the flow rate adjusting valve.
This makes it possible to finely adjust the vibration characteristics.

In the vehicle seat of the present invention,
With the first seat pad of the present invention described above,
With the flow rate change valve connected to the ventilation part,
A control unit that controls the flow rate change valve,
It is preferable to have.
This makes it possible to finely adjust the vibration characteristics.

The vehicle seat control method of the present invention
The method for controlling a vehicle seat in the first vehicle seat of the present invention described above.
The control unit controls the flow rate change valve in response to a signal from the outside.
According to the vehicle seat control method of the present invention, the resonance frequency of the seat pad can be changed without changing the foam itself constituting the seat pad.

According to the present invention, there is provided a seat pad, a vehicle seat, and a method for controlling a vehicle seat, which can change the resonance frequency of the seat pad without changing the foam itself constituting the seat pad. can do.

It is a perspective view which shows the seat for the vehicle which concerns on 1st Embodiment of this invention with the seat pad which concerns on 1st Embodiment of this invention. It is a vertical cross-sectional view along the line AA of FIG. 1 which shows the vehicle seat of FIG. It is a perspective view which shows a part of the seat pad of FIG. It is a figure for demonstrating the operation of the seat pad and the vehicle seat which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the operation of the conventional seat pad and a vehicle seat. It is a graph which shows the compression deflection curve which shows the relationship between the load and the deflection of a general polyurethane foam, and is the figure for demonstrating the action effect of the seat pad and the vehicle seat which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the seat pad and the vehicle seat which concerns on 1st modification of 1st Embodiment of this invention. It is a figure for demonstrating the seat pad and the vehicle seat which concerns on the 2nd modification of 1st Embodiment of this invention. It is a figure for demonstrating the seat pad and the vehicle seat which concerns on the 3rd modification of 1st Embodiment of this invention. It is a figure for demonstrating the seat pad and the vehicle seat which concerns on 4th modification of 1st Embodiment of this invention. It is a figure for demonstrating the seat pad and the vehicle seat which concerns on 5th modification of 1st Embodiment of this invention. It is a figure for demonstrating the seat pad and the vehicle seat which concerns on the 6th modification of 1st Embodiment of this invention. It is a figure for demonstrating the seat pad and the vehicle seat which concerns on 7th modification of 1st Embodiment of this invention. It is a figure for demonstrating the seat pad and the vehicle seat which concerns on 2nd Embodiment of this invention. It is a figure which shows the experimental result of Example 1 and Comparative Example 1 of the seat pad of this invention. It is a figure which shows the experimental result of the comparative example 2-4 of the seat pad of this invention.

The seat pad of the present invention can be suitably used for any kind of seat placed in an environment where vibration occurs, and is particularly preferably used for a vehicle seat.
Further, the seat pad, the vehicle seat, and the vehicle seat control method of the present invention can be used for any kind of vehicle, but in particular, a passenger car with a high demand for comfort and a truck that generates a large vibration. , Buses, construction vehicles and other large vehicles.

Hereinafter, embodiments of the seat pad, the vehicle seat, and the vehicle seat control method according to the present invention will be illustrated with reference to the drawings. The components common to each figure are designated by the same reference numerals.

[First Embodiment]
First, the seat pad, the vehicle seat, and the vehicle seat control method according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 13.

FIG. 1 shows the vehicle seat 1 of the present embodiment. FIG. 2 is a vertical cross-sectional view of the vehicle seat 1 of FIG. 1 along the line AA. The vehicle seat 1 of the present embodiment supports the seat pad 2 of the present embodiment, the cover member 13 that covers the front side (seat side) of the seat pad 2, and the seat pad 2 from below on the back side of the seat pad 2. It is equipped with a pan frame 6. The seat pad 2 of the present embodiment includes a cushion pad 2a for the seated person to sit on, and a back pad 2b for supporting the back of the seated person.
The cover member 13 is made of, for example, a material having good breathability (cloth or the like).
For convenience, the cover member 13 is shown by a solid line and the seat pad 2 is shown by a broken line in FIG. 1, but in FIG. 2, the cover member 13 is shown by a broken line and the seat pad 2 is shown by a solid line.
In this specification, as described in each drawing, "top", "bottom", "left", "right", "front", and "rear" when viewed from a seated person seated on the vehicle seat 1. Each direction is simply referred to as "up", "down", "left", "right", "front", "rear", and the like.
Hereinafter, among the seat pads 2, the cushion pad 2a instead of the back pad 2b will be described. Therefore, the cushion pad 2a may be simply referred to as a "seat pad 2".

The cushion pad 2a of the seat pad 2 includes a main pad portion 21 configured to rest the buttocks and thighs of the seated person, and a pair of side pad portions 22 located on the left and right sides of the main pad portion 21. is doing. The main pad portion 21 includes a lower buttock 21h configured to rest the buttock of the seated person and a lower thigh 21t located in front of the lower buttock 21h and configured to rest the thigh of the seated person. ,have.
The AA line in FIG. 1 passes through the lower buttock 21h.
In the example of FIG. 2, the main pad portion 21 and the side pad portion 22 are separately configured.
However, the main pad portion 21 and the side pad portion 22 may be integrally configured (integrally molded) in part or in whole.
In the example of FIG. 2, the side pad portion 22 has a covering portion 22a that covers the left and right side ends of the main pad portion 21 from above. However, the covering portion 22a may be omitted.

FIG. 3 shows only the main pad portion 21 of the seat pads 2 of FIG. In the examples of FIGS. 2 and 3, the seat pad 2 includes a packaging pad portion 150 as a component of the main pad portion 21. In the example of the figure, the main pad portion 21 is composed of two packaging pad portions 150 laminated in the vertical direction with each other. Each packaging pad portion 150 has a packaged foam 140 (foam) made of foam and a breathable bag body 130 that covers the outer surface of the packaged foam 140. The bag body 130 houses the foam to be packaged 140 inside.
In each drawing, for the sake of clarity of the drawing, a gap is provided between the bag body 130 and the packaged foam 140, but in reality, the bag body 130 and the packaged foam 140 are shown. There may be a gap between the 140 and the 140, but it is preferable that there is no gap.
In this example, the foam 140 to be packaged inside the bag 130 is in a natural state (uncompressed state, that is, a state where the compression rate is 0%) in a state where no load is applied to the packaging pad portion 150. In this state, the foam 140 to be packaged inside the bag 130 may be in a compressed state.
In this specification, the "compression rate" is defined by the following equation (1).
Compressibility (%) = (Volume in natural state [mm ³ ] -Volume after compression [mm ³ ]) x 100 / Volume in natural state [mm ³ ] ・ ・ ・ (1)

Of the seat pad 2, the material constituting the portion other than the packaging pad portion 150 is preferably a foam, more preferably an elastic resin foam, and particularly preferably a polyurethane foam.
As the material of the foam constituting the packaged foam 140, an elastic resin foam is preferable, and a polyurethane foam is particularly preferable. The material of the foam constituting the packaged foam 140 may be the same as or different from the material constituting the portion of the seat pad 2 other than the packaging pad portion 150. When the seat pad 2 has a plurality of the foams 140 to be packaged, the materials of the plurality of foams 140 to be packaged may be the same or different from each other.
The bag body 130 is made of a flexible material.

The air permeability of the bag body 130 is very low. As a result, if the packaged foam 140 of the packaging pad portion 150 is not covered with anything, it takes time from the decompression of the packaged foam 140 in a predetermined compressed state to the restoration to the state before compression. The time T1 from when the packaging pad portion 150 is decompressed in the predetermined compressed state to when it is restored to the state before compression is longer than the time T0 (that is, T1> T0). There is.
Here, as the "predetermined compression state", a compression state in any direction and compression rate may be set as long as the same compression state is used when measuring the times T0 and T1. For example, as a "predetermined compression state", a compression state in which the compression rate is 20% by compressing in the vertical direction, or a compression state when a pressurizer made of an iron grinding machine of 50 kg is placed from the top is set. good.
Specific examples of the method for giving the bag body 130 such low air permeability will be described later with reference to FIGS. 3, 7, and 8. The term "breathable" with respect to the bag 130 means that a part or the whole of the bag 130 can be ventilated.
Since the bag body 130 has such low air permeability, the packaging pad portion 150 is compressed (specifically, the foam to be packaged 140 is compressed) by applying a load to the packaging pad portion 150 to be packaged. When the load is released from the state where the air inside the foam 140 has flowed out of the bag 130, the return of the air to the inside of the bag 130 is delayed, and by extension, the packaging pad portion 150 is restored (specifically). It has a function of delaying the restoration of the packaged foam 140) and maintaining the compressed state of the packaged foam 140. While a load is applied to the packaging pad portion 150, a strong internal pressure is generated inside the bag body 130. Therefore, although the bag body 130 has low air permeability, the air inside the bag body 130 is compared. Although it goes out quickly, when the load is not applied to the packaging pad portion 150, only a pressure of about atmospheric pressure is applied to the inside and outside of the bag body 130. Therefore, due to the low air permeability of the bag body 130, the inside of the bag body 130 The speed of air return to is much slower.

The operation of this embodiment will be described with reference to FIG.
FIG. 4 shows the operation of the main pad portion 21 of the seat pad 2 according to the examples of FIGS. 2 and 3. As shown in FIG. 4, when the seating person P sits on the seat pad 2 from the state where the seat pad 2 is not loaded (FIG. 4A), the load from the seating person P is applied to the packaging pad portion 150. As a result, the air inside the foam 140 to be packaged goes out through the bag body 130 while the foam 140 to be packaged is compressed in the vertical direction (FIG. 4B). Next, when vibration from the vehicle body side is applied, the seated person P also vibrates up and down (FIG. 4 (c)). During that time, when the seated person P is displaced downward, the foam 140 to be packaged can be further compressed, but when the seated person P is displaced upward and the load is released from the packaging pad portion 150, the bag Due to the low air permeability of the body 130, the return of air to the inside of the bag body 130 is suppressed. Therefore, the restoration of the packaged foam 140 is suppressed until the seated person P is displaced downward again and the load is applied to the packaging pad portion 150, and the compressed state of the packaged foam 140 is almost or completely maintained. NS. As described above, in the seat pad 2 of the present embodiment, the compressed state of the foam to be packaged 140 is maintained at the time of vibration.
In FIG. 4B, the reference numeral DB indicates the deflection in the compression direction that occurs in the seat pad 2 when the seated person is seated when there is no vibration (at rest). In FIG. 4C, the reference numeral DR indicates a fluctuation region of the deflection of the seat pad 2 in the compression direction at the time of excitation (a region between the deflection DD at the maximum compression and the deflection DU at the maximum restoration). ..

Here, for comparison, the conventional operation will be described with reference to FIG.
FIG. 5 shows the operation of the main pad portion 21'of the conventional general seat pad 2'. In the example of FIG. 5, the foam 140'that constitutes the seat pad 2'is not covered by the low-breathable bag body 130 described above. In this case, from the state where no load is applied to the seat pad 2'(FIG. 5 (a)), the seater P sits on the seat pad 2'and the seat pad 2'is compressed (FIG. 5 (b)). The operation up to this point is the same as the example of FIG. However, at the time of vibration, the foam 140'follows the vibration of the seated person P and repeats large compression and restoration. As described above, the compressed state of the foam 140'is not maintained (FIG. 5 (c)).
In FIG. 5B, the symbol DB'indicates the deflection in the compression direction that occurs in the seat pad 2'when the seated person is seated when there is no vibration (at rest). In FIG. 5 (c), the symbol DR'is a fluctuation region of the deflection of the seat pad 2'in the compression direction at the time of excitation (a region between the deflection DD' at the time of maximum compression and the deflection DU'at the time of maximum restoration). Is shown.

Next, the effect of the present embodiment will be described with reference to FIG.
FIG. 6 shows a compression deflection curve of a typical polyurethane foam.
In the compression deflection curve of FIG. 6, the upper curve shows the curve at the time of compression, and the lower curve shows the curve at the time of restoration. The waveform of FIG. 6 does not show the experimental result of this embodiment, but it helps to understand the effect of this embodiment, and therefore, it will be described with reference to FIG. The symbols DR and DR'in FIG. 6 represent the fluctuation regions of the deflection in the compression direction at the time of excitation in the present embodiment and the conventional seat pad described above with reference to FIGS. 4 and 5, respectively. The load value "BW" is the weight of the seated person P.
The slope of the tangent to the compression deflection curve corresponds to the static spring constant of the polyurethane foam.
The inventor of the present invention has noted that in the compression deflection curve of a foam such as polyurethane foam, as shown in FIG. 6, the inclination of the tangent line and thus the static spring constant increase as the deflection and thus the compression ratio increase. did. Then, the inventor of the present invention can change the apparent static spring constant of the foam by changing the compression ratio of the foam without changing the material of the foam, and the foam can be changed accordingly. We have newly come up with the idea that the apparent dynamic spring constant can also be changed, and by maintaining the compressed state of the foam during excitation, the apparent spring constant of the foam is compressed during excitation. It can be held at a value higher than the previous spring constant (see the code DR in FIG. 6), and as a result, the resonance frequency of the foam can be made higher at the time of excitation than when the compressed state is not maintained. Was newly found.

In the present embodiment, after the packaged foam 140 is once compressed by the load from the seated person at the time of vibration, the compressed state is maintained by the low air permeability of the bag body 130, and as a result, the packaged foam The apparent spring constant of 140 and thus the cushion pad 2a can be held at a higher value than the spring constant before compression, and as a result, the resonance frequency of the packaged foam 140 and thus the cushion pad 2a can be set higher than that without the bag 130. , Can be raised.
As described above, according to the present embodiment, the resonance frequency of the seat pad can be changed only by covering the foam with a bag having low air permeability without changing the foam itself constituting the seat pad.

Further, the inventor of the present invention can not only change the resonance frequency (resonance point) as described above by compressing the packaging pad portion 150 in the vertical direction, but also almost change the vibration transmission rate (resonance magnification). I also found a new thing that can be prevented from letting go.
The vibration transmission rate of the packaged foam 140 of the packaging pad portion 150 constituting the seat pad is the breathability of the packaged foam 140, and by extension, air is released during compression / restoration of the packaged foam 140. This is largely due to the damping performance of the cells (air bubbles) that move in and out of the cell. In particular, the influence of the inflow and outflow of air is greater on the upper and lower surface sides than on the side surface side of the foam 140 to be packaged. In the present embodiment, as a result of extremely low ventilation in the vicinity of the boundary surface between the plurality of packaging pad portions 150 stacked in the vertical direction, the influence of the packaged foam 140 being surrounded by the bag body 130 is small. It is probable that it has become.
From the viewpoint of suppressing the change in the vibration transmission rate, it is preferable that the ventilation portion 132 of the bag body 130 is not provided on the upper and lower surfaces of the bag body 130, but is provided only on the side surface of the bag body 130.
Not limited to this embodiment, when the cushion pad 2a includes only one layer of the packaging pad portion 150, the vibration transmission rate (resonance point) is changed by compressing the packaging pad portion 150 in the vertical direction. It is also possible to make the resonance magnification) almost unchanged. Also in this case, from the viewpoint of suppressing the change in the vibration transmission rate, it is preferable that the ventilation portion 132 of the bag body 130 is not provided on the upper and lower surfaces of the bag body 130, but is provided only on the side surface of the bag body 130. ..
As described above, according to the present embodiment, the resonance frequency of the seat pad can be changed independently without changing the vibration transmissibility of the seat pad. Therefore, it becomes easy to adjust the vibration characteristics of the seat pad. For example, while adjusting the resonance frequency by the method of the present embodiment, it is possible to separately adjust the vibration transmissibility by another method (for example, the method of Patent Document 1).

In general, some foams have cells arranged in a specific direction, but such foams may be used as the foam to be packaged 140. In that case, regardless of the orientation of the cell with respect to the load input direction (vertical direction in this example), the vibration transmission rate is almost the same as described above, although the degree may vary depending on the method of the present embodiment. The resonance frequency can be changed without changing.

Further, since the seat pad of the present embodiment has a simple structure, it can be easily manufactured and the cost can be reduced.

In order to more reliably maintain the compressed state of the foam 140 to be packaged during vibration, it is important that the air permeability of the bag 130 is very low. If the bag body 130 has high air permeability, air can easily return to the inside of the bag body 130 when the load from the seated person is released at the time of vibration, so that the compressed state of the packaged foam 140 Becomes difficult to maintain. From this point of view, the packaging pad portion 150 is the packaged foam 140 (and thus, 60 seconds after the compression is released in a state where the packaged foam 140 (and by extension, the packaging pad portion 150) is compressed by 40%. As a result, it is preferable that the recovery rate of the packaging pad portion 150) is 20% or less, more preferably 10% or less. As a result, the compressed state of the packaged foam 140 can be more reliably maintained at the time of vibration, so that the resonance frequency can be changed more effectively.
Here, the "recovery rate" is defined by the following equation (2).
Recovery rate (%) = (compression rate before decompression (%))-(compression rate after decompression (%)) ... (2)
Therefore, "the recovery rate when 60 seconds have passed since the compression was released in the state of being compressed at 40%" is 60 after the compression is released from the compression rate of 40% before the decompression. It is the value obtained by subtracting the compression rate when seconds have passed.
From the same viewpoint, the packaging pad portion 150 is configured so that it takes 240 seconds or more, more preferably 300 seconds or more, from the decompression in the 40% compressed state to the restoration to the state before compression. It is preferable to have it.
Although the air permeability of the bag body 130 should be low, air can be released from the packaging pad portion 150 when a load of 50 kg is applied to the packaging pad portion 150, whereby the packaging pad portion 150 can be released. It is preferable that the air permeability is such that the compressibility of the material increases by 1% or more.

As shown in FIGS. 2 and 3, it is preferable that the seat pad 2 has a plurality of (two in the example of the figure) packaging pad portions 150 laminated in the vertical direction.
When the overall thickness (length in the vertical direction) is fixed, the multi-layer structure composed of a plurality of packaging pad portions 150 is compared with the single-layer structure composed of a single-layer packaging pad portion 150 from the compressed state. Restoration speed slows down. Therefore, by adopting the multilayer structure, the compressed state of the packaged foam 140 can be more reliably maintained at the time of vibration, and the resonance frequency can be changed more effectively. In addition, it is possible to more effectively suppress the change in the vibration transmissibility with the change in the resonance frequency.

The seat pad 2 of the present embodiment is not limited to the case where one or more packaging pad portions 150 constitute the entire main pad portion 21 of the seat pad 2 as in this example. A part of the main pad portion 21 in the vertical direction and / or the horizontal direction may be composed of the packaging pad portion 150, and the other portion may be composed of a normal foam not covered by the bag body 130. Further, not only the main pad portion 21 of the seat pad 2 but also a part or all of the side pad portion 22 may be composed of one or a plurality of packaging pad portions 150. Further, when the cushion pad 2a is viewed in a plan view, the plurality of packaging pad portions 150 may be arranged at different positions (for example, different positions in the front-rear direction or the left-right direction).

Here, with reference to FIGS. 3, 7, and 8, a method of giving the bag body 130 breathability will be described as an example.
In the example of FIG. 3, the bag body 130 has a bag body 131 made of a non-breathable material, and a ventilation portion 132 that enables ventilation to the inside and outside of the bag body 131. Examples of the non-breathable material constituting the bag body 131 include thermoplastic resins such as polypropylene resin, polyvinyl chloride resin, polycarbonate resin, nylon resin, polyethylene resin, and polyethylene terephthalate resin (PET resin).
In the present specification, the "non-breathable material" constituting the bag body 131 is a packaging pad portion when the bag body 130 does not have the venting portion 132 and is composed of only the non-breathable bag body 131. It refers to a non-breathable material to which the compression ratio of the packaging pad portion 150 does not increase because air does not escape from the packaging pad portion 150 even when a load of 70 kg is applied to the 150.
By making only a part of the bag body 130 a breathable portion 132, the bag body 130 can be relatively easily provided with the low air permeability as described above. Therefore, the bag body 130 can be easily manufactured.
In the example of FIG. 3, the ventilation portion 132 is a hole 132a formed in the bag body 131. In this case, in the production of the bag body 130, for example, it is only necessary to puncture the bag body 131 with a needle to form the hole 132a, so that the bag body 130 can be easily manufactured.
From the viewpoint of lowering the air permeability of the bag body 130, as shown in the example of FIG. 3, the bag body 130 has only one ventilation portion 132, and the holes 132a constituting the ventilation portion 132 are provided. The diameter is preferably 1 mm or less, and more preferably 0.8 mm or less. On the other hand, from the viewpoint of allowing air to smoothly flow out from the bag body 130 during compression, the diameter of the hole 132a is preferably 0.2 mm or more, and more preferably 0.3 mm or more. As a result, the compressed state of the packaged foam 140 can be more reliably maintained at the time of vibration, so that the resonance frequency can be adjusted more effectively.

FIG. 7 is a diagram corresponding to FIG. 3, and shows a first modification example of the vehicle seat 1 and the seat pad 2.
In the example of FIG. 7, not only a part of the bag body 130 is made breathable, but the whole bag body 130 is made of a low-breathable material, whereby the whole bag body 130 is made breathable. It differs from the example of FIG. By configuring the bag body 130 as in this example, it is possible to give the bag body 130 the low air permeability as described above.

FIG. 8 is a diagram corresponding to FIG. 3, and shows a second modification of the vehicle seat 1 and the seat pad 2.
The example of FIG. 8 is similar to the example of FIG. 3 in that the bag body 130 has a bag body 131 made of a non-breathable material and a ventilation portion 132, but the ventilation portion 132 However, it differs from the example of FIG. 3 in that it is a low-breathability sheet 132b made of a low-breathability material instead of holes. By configuring the bag body 130 as in this example, it is possible to give the bag body 130 the low air permeability as described above.

FIG. 9 is a diagram corresponding to FIG. 3, and shows a third modification example of the vehicle seat 1 and the seat pad 2.
The example of FIG. 9 is similar to the example of FIG. 3 in that the bag body 130 has a bag main body 131 made of a non-breathable material and a venting portion 132. The ventilation portion 132 may be composed of, for example, a hole 132a (FIG. 3) or a low ventilation sheet 132b (FIG. 8). Then, in the example of FIG. 9, the vehicle seat 1 is connected to the ventilation portion 132 of the seat pad 2 via the pipe 160, the flow rate adjusting valve FCV, the control unit 15 for controlling the flow rate adjusting valve FCV, and the seat pad. It is provided with a load sensor 16 that measures a load from a seated person who is seated in 2.
The control unit 15 controls the flow rate adjusting valve FCV in response to an external signal (output from the load sensor 16 or the sensor on the engine side, etc.). The control unit 15 is composed of a control device such as an ECU (Engine Control Unit) or a CPU (Central Processing Unit), for example.
The flow rate adjusting valve FCV is configured so that the valve can be opened and closed and the opening degree (and thus the flow rate) can be adjusted. In this example, in the flow rate adjusting valve FCV, the opening / closing and opening degree of the valve are controlled by the control unit 15. By changing the opening degree of the flow rate adjusting valve FCV, it is possible to change the ease with which air can flow in and out of the packaging pad portion 150, and thus the vibration characteristics of the packaging pad portion 150.
The load sensor 16 outputs the measured load value to the control unit 15.
The control unit holds in advance a load classification table WT for associating the load value output from the load sensor 16 with the load group in an internal or external storage unit (not shown). Considering the ease of control, the number of load groups is preferably, for example, two or three.
Further, the control unit has, in advance, an internal or external storage unit (not shown) having a flow rate adjustment table FT that associates the load group in the load classification table WT with the opening degree of the flow rate adjustment valve FCV. The flow rate adjusting table FT associates the load group with the opening degree so that, for example, the heavier the weight of the seated person, the larger the opening degree of the flow rate adjusting valve FCV.
In the vehicle seat 1 configured in this way, the control unit 15 can control the vehicle seat 1 as follows, for example.
First, when the control unit 15 detects that the seated person is seated on the seat pad 2 based on the output from the load sensor 16, the flow rate adjusting valve FCV is opened according to the load value output from the load sensor 16. Control the degree. Specifically, first, with reference to the load classification table WT, a load group associated with the load value output from the load sensor 16 in advance is specified. Next, with reference to the flow rate adjustment table FT, the opening degree associated with the load group specified as described above is specified in advance. Then, the opening degree of the flow rate adjusting valve FCV is controlled so as to have a specified opening degree. When vibrated in that state, the packaging pad portion 150 is maintained in the compressed state during that time.
After that, when the control unit 15 detects that the engine has stopped based on the output from the sensor on the engine side, the flow rate adjusting valve FCV is fully opened. As a result, when the seated person subsequently leaves the seat pad 2 and exits the vehicle, the packaging pad portion 150 of the seat pad 2 in the compressed state is gradually restored and can return to the original state.
As described above, in this example, by changing the opening degree of the flow rate adjusting valve FCV according to the weight of the seated person, it is easy for air to flow in and out of the packaging pad portion 150, and by extension, the packaging pad portion. The vibration characteristics of 150 can be changed. This makes it possible to automatically fine-tune the vibration characteristics according to the weight of the seated person.

FIG. 10 is a diagram corresponding to FIG. 9, and shows a fourth modified example of the vehicle seat 1 and the seat pad 2.
In the example of FIG. 10, the vehicle seat 1 is manually connected to the ventilation portion 132 of the seat pad 2 by the flow rate adjusting valve FCV, the control unit 15 that controls the flow rate adjusting valve FCV, and the user manually. It includes an operation unit 17 that accepts operations. In this example, the control unit 15 controls the opening / closing and opening degree (and thus the flow rate) of the flow rate adjusting valve FCV according to the signal output from the operation unit 17 when the operation unit 17 is operated. , Different from the example of FIG.
As described above, in this example, the operator (for example, the manufacturer, seller, or seated person of the vehicle) operates the operation unit 17 according to the request or his / her preference, and opens the flow rate adjusting valve FCV. By appropriately changing the above, it is possible to change the ease with which air can flow in and out of the packaging pad portion 150, and by extension, the vibration characteristics of the packaging pad portion 150. As a result, the vibration characteristics can be finely adjusted manually.

The configuration of the example of FIG. 9 and the configuration of the example of FIG. 10 may be combined so that the flow rate adjusting valve FCV can be controlled both manually and automatically.
Further, in the examples of FIGS. 9 and 10, the flow rate adjusting valve FCV may be mechanically opened / closed or the opening degree may be adjusted via a link mechanism or the like instead of being electrically controlled by the control unit 15. ..

By changing the material and thickness of the foam 140 to be packaged in the packaging pad 150 and changing the material and breathability of the bag 130, the vibration characteristics of the packaging pad 150 and thus the cushion pad 2a can be changed. can.
Further, as in each of the above-mentioned examples, when the cushion pad 2a of the seat pad 2 has a plurality of packaging pad portions 150 laminated on the upper and lower sides, the material of the packaged foam 140 of the packaging pad portion 150 of each layer and the material of the packaged foam 140 are used. The vibration characteristics of the cushion pad 2a of the seat pad 2 can also be changed by changing the thickness or changing the material and air permeability of the bag body 130 of each layer. Therefore, the vibration characteristics can be easily adjusted during manufacturing or use.
When only the stacking order of the plurality of packaging pad portions 150 having different packaged foam 140s and bag bodies 130 is changed, the vibration characteristics do not change. However, in that case, the feeling of sitting (comfort) felt by the seated person can be changed.
For example, as in the fifth modification shown in FIG. 11, when the packaged foam 140u of the upper packaging pad portion 150u is made of a material softer than the packaged foam 140l of the lower packaging pad portion 150l, Even if the thickness of both is not changed, when the seated person is seated, it is possible to give the seated person a feeling of being soft at first and firmly supported later.
Alternatively, as in the sixth modification shown in FIG. 12, when the packaged foam 140u of the upper packaging pad portion 150u is made thicker than the packaged foam 140l of the lower packaging pad portion 150l, both are used. It is possible to give the seated person a feeling of deeply sinking when the seated person is seated without changing the material of.
Further, in the example of FIG. 12, as in the example of FIG. 11, the packaged foam 140u of the upper packaging pad portion 150u is made of a material softer than the packaged foam 140l of the lower packaging pad portion 150l. May be good.

FIG. 13 is a drawing corresponding to FIG. In each example described in the present specification, as in the seventh modification shown in FIG. 13, the seat pad 2 has one or more main pad portions 21 (two in the example of FIG. 13). It has a portion 150 and a covering portion 21a that covers the upper side of these packaging pad portions 150, and the covering portion 21a of the main pad portion 21 is integrally formed with a pair of left and right side pad portions 22. May be good. In this case, at the time of manufacturing the seat pad, the packaging pad portion 150 is formed in the recess 23 on the back side of the cushion pad 2a of the seat pad 2, which is partitioned by the covering portion 21a of the main pad portion 21 and the pair of side pad portions 22. It is housed inside from the back side.

[Second Embodiment]
Next, the seat pad, the vehicle seat, and the vehicle seat control method according to the second embodiment of the present invention will be described with reference to FIG. 14, focusing on the points different from those of the first embodiment. ..

FIG. 14 is a diagram corresponding to FIG. 9, and shows a seat pad 2 and a vehicle seat 1 according to the present embodiment.
The example of FIG. 14 is similar to the example of FIG. 3 in that the bag body 130 has a bag main body 131 made of a non-breathable material and a venting portion 132. In the example of FIG. 14, the vehicle seat 1 includes a check valve CHV connected to the ventilation portion 132 of the seat pad 2 via a pipe 160, and a control unit 15 for controlling the check valve CHV. ing. Although not shown, the vehicle seat 1 may further include a load sensor 16 (FIG. 9) and an operation unit 17 (FIG. 10).
The ventilation portion 132 can be formed of, for example, a hole 132a having the same diameter as the pipe 160. However, as the ventilation portion 132, a small hole 132a as in the example of FIG. 3 or a low ventilation sheet 132b as in the example of FIG. 8 may be used.
The control unit 15 controls the check valve CHV in response to an external signal (output from a sensor on the engine side, etc.).
The check valve CHV is configured so that the operation and release of the check function can be switched, and when the check function is activated, only the passage of air that goes out of the bag body 131 from the ventilation unit 132 is allowed. It is configured in. In this example, the check valve CHV is controlled by the control unit 15 to switch the operation and release of the check function. By activating the check function of the check valve CHV, the air once discharged from the packaging pad portion 150 is prevented from returning to the packaging pad portion 150. Therefore, by maintaining the check function of the check valve CHV in the operating state at the time of vibration, once the packaging pad portion 150 is compressed by the weight of the seated person, the compressed state can be reliably maintained, and by extension, the compressed state can be maintained. , The resonance frequency can be increased.
That is, in the second embodiment, the packaging pad is not maintained in the compressed state of the packaging pad portion 150 by giving the bag body 130 itself low air permeability as in the first embodiment, but by the check valve CHV. The compressed state of the part 150 is maintained. Therefore, it is not necessary to reduce the air permeability of the bag body 130 itself. Therefore, when the ventilation portion 132 is composed of the holes 132a, the diameter of the holes 132a may be more than 1 mm, unlike the example of FIG.
In the vehicle seat 1 configured in this way, the control unit 15 can control the vehicle seat 1 as follows, for example.
First, when the control unit detects that the seated person is seated on the seat pad 2, it activates the check function of the check valve CHV. When vibrated in that state, the packaging pad portion 150 is maintained in the compressed state during that time.
After that, when the control unit 15 detects that the engine has stopped based on the output from the sensor on the engine side or the like, the control unit 15 releases the check function of the check valve CHV. As a result, when the seated person subsequently leaves the seat pad 2 and exits the vehicle, the packaging pad portion 150 of the seat pad 2 in the compressed state is restored and can return to the original state.
As described above, in this example, by maintaining the check function of the check valve CHV in the operating state at the time of vibration, once the packaging pad portion 150 is compressed by the weight of the seated person, the compressed state is changed. It can be reliably maintained, and by extension, the resonance frequency can be increased.
Therefore, also in this embodiment, the resonance frequency of the seat pad can be changed without changing the foam itself constituting the seat pad.

In the example of FIG. 14, the check valve CHV may be mechanically switched between operation and release of the check function via a link mechanism or the like instead of being electrically controlled by the control unit 15. ..

The technical elements in each of the above-described examples in the first embodiment and the second embodiment may be arbitrarily combined.

[Example, Comparative Example]
Here, examples and comparative examples of the seat pad of the present invention will be described with reference to FIGS. 15 and 16.

<Example 1 and Comparative Example 1>
FIG. 15 shows the results of vibration experiments on Example 1 and Comparative Example 1 of the seat pad of the present invention.
As shown in FIG. 3, the test body of Example 1 was a laminated structure in which two layers of packaging pad portions 150 were laminated one above the other, assuming the main pad portion 21 of the cushion pad 2a. The foam 140 to be packaged in each packaging pad portion 150 was made of polyurethane foam and had dimensions of 400 mm × 400 mm × 50 mm. The bag body 131 of the bag body 130 of each packaging pad portion 150 was made of polyethylene, and a puncture hole having a diameter of about 0.5 mm was formed therein, and this was used as a ventilation portion 132. The packaging pad portion 150 is compressed in a compressed state when the packaged foam 140 is not covered with anything, and the packaged foam 140 is loaded with a pressurizer made of an iron grinding machine of 50 kg from the top. The compression is released in the compressed state when the packaging pad portion 150 is loaded with a pressurizer made of an iron grinding machine of 50 kg from the top, rather than the time T0 required from the release to the restoration to the state before compression. The time T1 required to restore the state before compression was longer.
The test body of Comparative Example 1 did not have a bag body and was a single-layer structure composed of a single layer of foam. The material of this foam was polyurethane foam, and the dimensions were 400 mm × 400 mm × 100 mm.
The composition of the polyurethane foam used in Example 1 and Comparative Example 1 was the same.
In the vibration tests of Example 1 and Comparative Example 1, the four sides of the test body are surrounded by foams assuming the side pads 22, and the test body and the foams around the test body are assumed to be pan frames 6. It was placed on the constructed receiver. Then, assuming a state in which a 50 kg seated person was seated, a pressurizer made of a 50 kg iron laboratory was placed from above. In that state, a vibration test was carried out at a frequency of 1 to 10 Hz and a sweep time of 5 minutes.
In FIG. 15, the horizontal axis is the frequency (Hz) and the vertical axis is the vibration transmissibility.
As can be seen from the results of FIG. 15, in Example 1 using the bag body 130, the resonance frequency was significantly higher than that in Comparative Example 1 in which the bag body 130 was not used, whereas the vibration transmission rate was higher. It didn't change much. Specifically, in Example 1, the resonance frequency was increased by 1.2 Hz as compared with Comparative Example 1, while the vibration transmissibility was increased by only 0.04.

<Comparative Examples 2 to 4>
FIG. 16 shows the results of vibration experiments on Comparative Examples 2 to 4 of the seat pad of the present invention.
The test bodies of Comparative Examples 2 to 4 did not have a bag body and were a single-layer structure composed of a single layer of foam. The material of this foam was polyurethane foam, and the dimensions were 400 mm × 400 mm × 100 mm. In Comparative Examples 2 to 4, the hardness was made different from each other by making the composition of the polyurethane foam different from each other. Along with this, in Comparative Examples 2 to 4, other physical properties such as mass were also different from each other. Comparative Example 2 had a high hardness, Comparative Example 3 had a medium hardness, and Comparative Example 4 had a low hardness.
In the vibration tests of Comparative Examples 2 to 4, each of the four sides of the test body was surrounded by a foam material assuming the side pad 22, and the test body and the foam material around the test body were configured assuming the pan frame 6. It was placed on the receiver. Then, assuming a state in which a 50 kg seated person was seated, a pressurizer made of a 50 kg iron laboratory was placed from above. In that state, a vibration test was carried out at a frequency of 1 to 10 Hz and a sweep time of 5 minutes.
In FIG. 16, the horizontal axis is the frequency (Hz) and the vertical axis is the vibration transmissibility.
As can be seen from the results of FIG. 16, the lower the hardness, the higher the resonance frequency and the lower the vibration transmissibility due to the change allowance larger than the resonance frequency. Specifically, when comparing Comparative Example 2 having the highest hardness and Comparative Example 4 having the lowest hardness, Comparative Example 4 has a resonance frequency increased by about 0.3 Hz as compared with Comparative Example 2, whereas vibration occurs. The transmission rate has dropped by about 1. As described above, it can be seen that when the hardness of the foam is different by changing the material of the foam, not only the resonance frequency but also the vibration transmissibility changes significantly.

The seat pad of the present invention can be suitably used for any kind of seat that is placed in an environment where vibration occurs, and is particularly preferably used for a vehicle seat.
Further, the seat pad, the vehicle seat, and the vehicle seat control method of the present invention can be used for any kind of vehicle, but in particular, a passenger car with a high demand for comfort and a truck that generates a large vibration. , Buses, construction vehicles and other large vehicles.

1: Vehicle seat, 2: Seat pad, 2a: Cushion pad, 2b: Back pad, 6: Pan frame, 13: Cover member, 15: Control unit, 16: Load sensor, 17: Operation unit, 21: Main pad Part, 21a: Covered part, 21h: Lower butt, 21t: Lower thigh, 22: Side pad part, 22a: Covered part, 23: Recess, 130, 130u, 130l: Bag body, 131: Bag body, 132: Ventilation Part, 132a: Hole, 132b: Low air permeability sheet, 140, 140u, 140l: Packaged foam (foam), 140': Foam, 150, 150u, 150l: Packaging pad part, 160: Piping, CHV: Check valve, FCV: Flow control valve, P: Seated person, FT: Flow rate adjustment table, WT: Load classification table

Claims (5)

A packaging pad portion having a foam and a breathable bag covering the foam is provided.
When the foam is not covered with anything, the packaging pad portion has the predetermined time than the time T0 from when the foam is decompressed in a predetermined compressed state to when the foam is restored to the state before compression. more of the takes to restore from is released is compressed in the compression state to the state of pre-compression time T1 it is, rather than long,
The bag body
A bag body made of non-breathable material and
A ventilation part that enables ventilation inside and outside the bag body,
Have and
The vent is a seat pad that is not connected to a valve. The seat pad according to claim 1, wherein the packaging pad portion is configured such that the recovery rate when 60 seconds have passed since the compression was released in the state of being compressed by 40% is 20% or less. The seat pad according to claim 1 or 2, wherein a plurality of the packaging pad portions are laminated in the vertical direction. The ventilation portion is a hole formed in the bag body, and is
The seat pad according to any one of claims 1 to 3, wherein the hole has a diameter of 1 mm or less. The seat pad according to any one of claims 1 to 3, wherein the breathable portion is a low breathability sheet made of a low breathability material.

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