JP2004268692A - Seat for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat for a vehicle such as an automobile furnished with an air cushion, etc. to improve riding comfortability by optimizing a vibration-proofing characteristic of the air cushion, in particular, a vibration damping characteristic in accordance with a seating state of an occupant, a vehicle travelling state, etc. <P>SOLUTION: A rear part of a cushion pad 2 of a seat part, that is, a region 2a to support the buttocks of the occupant is placed and supported on a recessed part 3a of a plate type frame 3 through an air cushion 11. This air cushion 11 is made of two air bags 11-1, 11-2 vertically accumulated, and these air bags can be communicated to each other through a solenoid valve 15 and a piping 17. The vibration-proofing characteristic is improved and especially kinematic magnification is maintained low by controlling opening-closing and a contraction degree of the solenoid valve 15 in accordance with frequency which the seat 1 for the vehicle receives. Additionally, sliding-off of the occupant is prevented by actuating a solenoid valve 16 for emergency exhaust and contracting the air cushion 11 at the time of collision of the vehicle. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle seat for an automobile or the like. In particular, the present invention relates to a vehicle seat provided with a mechanism for improving ride comfort of an occupant.
[0002]
[Prior art]
BACKGROUND ART In a vehicle seat that receives vibration during traveling of a vehicle, a cushion material such as an elastic resin foam is disposed on a seat portion and a backrest portion in order to reduce transmission of vibration to an occupant and maintain good riding comfort.
[0003]
Various types of such vehicle seats using an air suspension device or an air cushion have been proposed for the purpose of improving ride comfort, adjusting the height of a seat, and the like (Japanese Patent Laid-Open No. 5-213102). , JP-A-7-308235, and JP-A-9-290669).
[0004]
In the vehicle seat disclosed in JP-A-5-213102, a cushion pad of a seat is supported from below by a frame structure including an upper frame and a lower frame, and an upper frame on which the cushion pad is directly mounted includes one air spring and It is supported from the lower frame movably up and down via an air suspension device having an X-shaped link structure. The air spring has a substantially cylindrical shape having a bellows structure on its peripheral surface, and is expanded and contracted by the introduction and discharge of compressed air.
[0005]
In the vehicle seat disclosed in Japanese Patent Application Laid-Open No. 7-308235, an air cushion composed of a plurality of cylindrical air chambers is provided on a backrest portion, and a valve for each air chamber is provided in a path for supplying and exhausting air from an air pump. Is provided. Thus, by independently controlling the amount of air in each air chamber, the shape of the front surface of the backrest can be adjusted according to the body shape of the user.
[0006]
Further, in Japanese Patent Application Laid-Open No. 9-290669, the height of the upper surface of the seat can be adjusted by disposing an inflatable / contractible air cushion inside the cushion pad of the seat. In this air cushion, a plurality of cylindrical air chambers are connected to each other through a communication pipe, and the entire mat-shaped air cushion is evenly expanded by the supply of air from an air pump.
[0007]
On the other hand, in Japanese Patent Application Laid-Open No. 7-25279, in a structure in which a cushion pad of a seat portion is placed and supported on a plate-like frame, a region between the cushion pad and the plate-like frame is supported in a region supporting an occupant's buttocks. An air cushion consisting of only one bag is interposed.
[0008]
At the time of a vehicle collision, the air in the air cushion is exhausted through the electromagnetic release valve, and the air cushion contracts, thereby dropping the buttocks support area of the cushion pad. That is, at the time of a vehicle collision, the occupant's buttocks are dropped downward, thereby preventing the occupant from sliding downward from the lower body side along the cushion pad of the seat (so-called “submarine” phenomenon).
[0009]
A seat belt or an airbag device is usually attached to the vehicle seat. They could slip down and fail to adequately protect the occupants.
[0010]
The air cushion and the air spring of the vehicle seat described above are provided with a function of adjusting the height position or the projection size of the seat by adjusting the amount of air.
[0011]
[Patent Document 1] JP-A-5-213102
[Patent Document 2] JP-A-7-308235
[Patent Document 3] Japanese Patent Application Laid-Open No. 9-290669
[Patent Document 4] Japanese Patent Application Laid-Open No. 7-25279
[Problems to be solved by the invention]
However, these have a relatively complicated mechanism for adjusting the height position or the protruding dimension, but have a mechanism for maintaining the vibration damping characteristics in an optimum state according to a vehicle running state or the like. I didn't.
[0016]
The present invention optimizes vibration damping characteristics, particularly vibration damping characteristics of an air cushion according to a seating state of an occupant, a running state of a vehicle, and the like in a vehicle seat for an automobile or the like having an air cushion. By doing so, it is intended to provide something that can improve ride comfort.
[0017]
[Means for Solving the Problems]
A vehicle seat according to the present invention is a vehicle seat including a cushion pad that supports a passenger's buttocks and thighs, and a frame that supports the cushion pad from below. A plurality of air bags for elastically supporting from the frame are provided, and these air bags are communicated with each other via a variable throttle valve, so that a seated state of an occupant, a running state of the vehicle, or a vibration received by the cushion pad is provided. Based on frequency distribution or intensity, by adjusting the degree of throttle of the variable throttle valve or opening and closing the on-off valve, a mechanism for adjusting the vibration isolation characteristics of the set of air bags is provided. Features.
[0018]
According to a first preferred embodiment, the plurality of air bladders are vertically stacked below an occupant's seat on the cushion pad.
[0019]
With such a configuration, by appropriately controlling opening / closing or narrowing of the air flow path between the upper and lower air bags stacked, the vibration damping characteristics are optimized in accordance with the vibration frequency region. be able to.
[0020]
According to a second preferred embodiment, the plurality of air bladders are arranged below the seating portion of the occupant and below or inside the left and right side portions of the cushion pad.
[0021]
With such a configuration, by appropriately controlling the opening and closing or narrowing of the air flow path between the airbags on the seat portion and both side portions, the vibration damping characteristic is optimized according to the vibration frequency range. Can be
[0022]
Preferably, the plurality of air bladders are made of an elastic material, and have different elastic coefficients against the internal air pressure.
[0023]
With such a configuration, cushioning properties and vibration damping characteristics can be improved.
[0024]
Further, preferably, at least one of the plurality of air bags is disposed corresponding to a region supporting the occupant's buttocks, and the air bags are provided with an internal pressure release valve for releasing internal air pressure, When an abnormal acceleration is detected, a mechanism is provided that operates the internal pressure release valve to contract the air bag, thereby causing the buttocks support area of the cushion pad to be depressed.
[0025]
With such a mechanism, it is possible to prevent the occupant from sliding down along the seat cushion pad at the time of a vehicle collision or the like, and to enhance safety.
[0026]
In this case, preferably, a groove or a cut is provided on the surface of the cushion pad along a boundary between the buttocks support region and a region in front thereof.
[0027]
With such a configuration, the deformation of the cushion pad for dropping the buttocks of the occupant when receiving an abnormal acceleration becomes easier.
[0028]
Preferably, a seat belt is provided for holding the waist or thigh of the occupant. The seat belt has a mechanism (pretension) that instantaneously increases the tension of the seat belt when abnormal acceleration is detected. Mechanism), and the upper ends of the left and right fastening portions supporting the seat belt are positioned lower than the upper surface of the side portion of the cushion pad.
[0029]
With such a configuration, the occupant can be more quickly dropped from the buttocks using the restraining force of the pretensioning mechanism of the seat belt.
BEST MODE FOR CARRYING OUT THE INVENTION
First Embodiment A first embodiment of the present invention will be described with reference to FIGS.
[0031]
The partial cross-sectional side views of FIGS. 1 and 2 schematically show the vehicle seat (seat) 1 of the present embodiment in a normal state and a state when an abnormal acceleration is received.
[0032]
The vehicle seat 1 in the embodiment is for a passenger car, and is provided with a three-point fixed type seat belt 4. The cushion pad 2 of the seat, the backrest 5 and the headrest 51 are each made of a cushion material such as a soft urethane foam and a skin covering the cloth or leather. The backrest 5 and the headrest 51 fixed thereto are provided so as to be reclineable with respect to the cushion pad 2 which is arranged substantially horizontally.
[0033]
In the cushion pad 2 of the seat portion, a front portion, that is, a region 2b for supporting a thigh of an occupant is placed and supported on a plate-shaped frame 3 made of a steel plate or the like.
[0034]
On the other hand, a rear portion of the cushion pad 2, that is, a region 2a for supporting the buttocks of the occupant is placed on the plate-shaped frame 3 via the air cushion 11. The thickness of the cushion pad 2 is substantially equal through the buttocks support region 2a and the thighs support region 2b, and the plate-shaped frame 3 has a recess 3a for receiving the air cushion 11 in the buttocks support region 2a. .
[0035]
The air cushion 11 is in the shape of a rectangular / flat air pillow (pillow), and is formed by overlapping two air bladders 11-1 and 11-2 vertically. Each of the air bladders 11-1 and 11-2 is made of an airtight elastic material such as rubber, and a restoring force acts on the air bladders to contract against the internal air pressure. These air bladders 11-1 and 11-2 can flow through each other via a pipe 17 and an electromagnetic valve 15 provided in the middle of the pipe.
[0036]
When the vibration acting on the vehicle seat 1 is in a low frequency region (for example, 3 Hz or less), the electromagnetic valve 15 is fully opened or opened to a state close to this, so that the upper and lower air bladders 11-1 and 11-2 are opened. Allow air to flow. That is, air flows through the pipe 17 and the throttle of the electromagnetic valve 15. As a result, the loss due to viscous resistance increases, and the speed of restoration from the deformed state also decreases. In the low frequency region, such a vibration damping effect is large, so that the resonance magnification of the entire air cushion 11 as a spring also decreases.
[0037]
On the other hand, a difference in hardness (spring constant) as a spring is provided between the upper and lower air bladders 11-1 and 11-2 in order to improve cushioning and vibration damping characteristics. -1 is softer.
[0038]
However, since air flows in both directions between the upper and lower air bags 11-1 and 11-2 as described above, the internal pressures of the air bags 11-1 and 11-2 in the steady state are equal to each other. Therefore, it is not possible to provide a difference in spring hardness due to air pressure.
[0039]
Therefore, the elastic film constituting the upper air bag 11-1 is configured to have a lower elasticity against the internal air pressure than the elastic film constituting the lower air bag 11-2. For example, as the material of the rubber or resin constituting the upper air bag 11-1, a material having lower elasticity than the material of the lower air bag 11-2 is used, or the thickness of the film is made smaller. Alternatively, a difference in elasticity is provided between the upper and lower air bladders 11-1 and 11-2 by appropriately adjusting the presence or absence of a reinforcing fiber, the material type, the diameter, the driving density, and the like.
[0040]
On the other hand, when the vibration acting on the vehicle seat 1 is in a high frequency region (for example, 4 Hz or more), the resonance magnification is reduced by completely closing the electromagnetic valve 15 or narrowing down to a state close to this. Further, when it is in an intermediate region between the low-frequency region and the high-frequency region (for example, 3 to 4 Hz), the degree of resonance of the electromagnetic valve 15 is adjusted by appropriately adjusting the degree of throttle to keep it half-open or close to this. keep.
[0041]
During the operation of the vehicle, the electromagnetic valve 15 is controlled by the control unit based on the detection of a vibration frequency detecting device (not shown) so that the degree of throttle or the degree of opening and closing is adjusted in real time so as to be in an optimal state for vibration isolation, particularly for lowering the resonance magnification. Is adjusted automatically.
[0042]
The inner ends of emergency exhaust pipes 18-1 and 18-2 are connected to the upper and lower air bags 11-1 and 11-2 of the air cushion 11, respectively, and the outer ends of these pipes 18-1 and 18-2. The end is connected to one emergency exhaust electromagnetic valve 16. The emergency exhaust electromagnetic valve 16 is normally closed, and operates only when detection is performed by an abnormal acceleration detection device (not shown). The inner diameters of these pipes 18-1 and 18-2 and the flow path diameter when the electromagnetic valve 16 is opened are provided sufficiently large so that the air in the air cushion 11 can be instantaneously discharged.
[0043]
FIG. 2 shows a state after the abnormal acceleration is detected, the emergency exhaust electromagnetic valve 16 is operated, and the internal pressure of the air cushion 11 is instantaneously released.
[0044]
The buttocks support area 2a of the cushion pad 2 is bent (bent) so as to swell into the recess 3a of the plate-shaped frame 3 due to the weight of the occupant as a result of the loss of support by the air cushion 11. Then, the bottom surface of the concave portion 3a of the plate-shaped frame 3 is supported via the elastic films of the air bladders 11-1 and 11-2.
[0045]
At this time, the occupant's buttocks fit into the depression formed on the upper surface of the cushion pad 2 at the same time.
[0046]
That is, when the vehicle collides with an object ahead or when sudden braking is applied, the state shown in FIG. 1 is instantaneously shifted to the state shown in FIG. During and after the transition, the upper surface of the cushion pad 2 has a rearwardly facing slope, that is, a downwardly sloping slope, from the thigh support region 2b of the cushion pad 2 to the buttocks support. It is formed over the center of the region 2a. This inclined surface receives the inertial force of the occupant trying to slide forward.
[0047]
If the vehicle shifts to the state shown in FIG. 2, it is possible to reduce the impact applied to the occupant's body even when the vehicle is hit by a rear-end collision.
[0048]
FIG. 3 schematically shows the cushion pad 2 of the seat used for the vehicle seat of the embodiment.
[0049]
As shown in FIG. 3, near the boundary between the buttocks support region 2a and the front thigh support region 2b, wedge-shaped grooves 21 and 22 extending in the left-right direction are provided on both upper and lower surfaces. I have. This is to make it easier for the buttocks support region 2a of the cushion pad 2 to sink downward when abnormal acceleration due to a collision or the like is detected.
[0050]
As shown in FIG. 1, the groove 21 on the lower surface of the cushion pad 2 is provided near the front end of the concave portion 3a of the plate-like frame 3, and the groove 22 on the upper surface is slightly rearward. Provided. As shown in FIG. 2, these grooves 21 and 22 are provided at locations where the greatest distortion occurs when the buttocks support region 2a is depressed, so as to relieve stress for deformation, Is to reduce the resistance.
[0051]
The occupant's ischium lower end expected position 2c is substantially at the center in the front-rear direction in the buttocks support region 2a, and is designed so that depression when an abnormal acceleration is detected is easily performed.
[0052]
FIG. 4 shows a configuration of a main part of the three-point fixed type seat belt 4.
[0053]
Of the three-point fixed type seat belt 4, the lower seat belt 41 that restrains the waist or the base of the thigh is hung and fixed between the fastening portions 43 and 44 on the left and right sides of the vehicle seat 1. ing. One fastening end 44 is fixed to the fixing portion 45 by a one-touch fastening mechanism when the occupant is seated. The other fastening end 43 is fixed so as not to be detached during use, and the leading end of the seat belt 41 extending through the fastening end 43 is wound into a pretension device 46 also serving as a winding device during normal use. Has been taken.
[0054]
The pretensioning device 46 is used to prevent the occupant from being thrown forward in the event of a vehicle collision or the like, and to quickly retract and tighten the seat belt 41 to detect and restrain the occupant when abnormal acceleration is detected. is there. The cross-shaped portion 42 of the three-point fixed type seat belt 4 is integrally connected to the lower seat belt 41 inside the fastening end 44 connected to the fixing portion 45, and is tensioned by being pulled in by the pretensioning device 46. State.
[0055]
As shown in FIG. 4, in the seat belt 41 provided in the vehicle seat 1 of the embodiment, the upper ends 43 a and 44 a of the left and right fastening ends 43 and 44 are both lower than the upper end 23 a of the side seat portion 23. Located in. Therefore, when the abnormal acceleration is detected, the internal pressure of the air cushion 11 is released, and at the same time, the force of dropping the occupant downward through the seat belt 41 by the operation of the pretensioning device 46 sufficiently acts. Become.
[0056]
That is, the pretensioning device 46 is provided on the lower seat belt 41, and the left and right fastening ends 43, 44 of the seat belt 41 are sufficiently located below. The occupant can be quickly pulled down by the restraining force of the pretensioning device.
[0057]
A cross-sectional view in the left-right direction of FIG. 5 schematically illustrates a main part of the vehicle seat of the second embodiment.
[0058]
In the first embodiment, the air cushion 11 on the lower surface of the buttocks support region 2a is composed of the upper and lower two air bladders 11-1 and 11-2. The cushion 11 consists of one air bag. Further, air pads 13-1 and 13-2 made of one air bag are arranged between the left and right side portions 23 of the seat cushion 2 and the left and right end portions of the plate-shaped frame 3, respectively. Are elastically supported. The air cushion 11 below the buttocks and the left and right air pads 13-1 and 13-2 are communicated with each other via electromagnetic valves 15-1 and 15-2 with variable aperture.
[0059]
The air cushion 11 in the buttocks support region 2a has a rectangular / flat air pillow shape as in the case of the first embodiment, and is accommodated in the concave portion 3a of the plate-shaped frame 3. In addition, the internal pressure is released through the emergency exhaust pipe 18 and the emergency exhaust electromagnetic valve 16 when the abnormal acceleration is detected. That is, it is configured such that the buttock support region 2a of the cushion pad 2 and the occupant can be dropped downward when abnormal acceleration is detected.
[0060]
The cushion pad 2 has a relatively high side portion 23. As shown in FIG. 5, the cross section of the side portion 23 cut in the left-right direction has a substantially inverted U-shape or an inverted U-shape. In detail, after extending from the buttocks support region 2a so as to spread left and right to form an inclined plate-like portion 23b, it is curved to face vertically downward and forms a relatively short vertical plate-like portion 23c at the left and right ends. . That is, a wedge-shaped concave portion 24 that is deeply cut is formed on the lower surface side by the substantially U-shaped cross section of each side portion 23.
[0061]
The air pads 13-1 and 13-2 are relatively elongated rectangular / flat air pillows, are arranged so that the width direction of the rectangle is substantially vertical, and are located on the lower surface of the side portion 23 of the cushion pad 2. It is inserted into a wedge-shaped recess 24.
[0062]
On the other hand, in the plate-shaped frame 3, a portion extending outward from the bottom surface of the concave portion 3 a for accommodating the air cushion 11 is smoothly curved upward to form a bouncing end 33. Then, the lower ends of the air pads 13-1 and 13-2 protruding downward from the wedge-shaped concave portion 24 are located between the jumping end 33 of the plate frame 3 and the inclined plate portion 23 b of the side portion 23. Is sandwiched between.
[0063]
Thus, the air pads 13-1 and 13-2 are sandwiched between the side portions 23 of the cushion pad 2 and the plate-shaped frame 3 so as to be wrapped therebetween. A cushioning action and a vibration insulating action are performed between them.
[0064]
When the vibration acting on the vehicle seat 1 is in a low frequency region (for example, 3 Hz or less), the left and right electromagnetic valves 15-1 and 15-2 are fully opened or in a state close to this, and the air cushion 11 and the left and right air pads 13 are set. -1 and 13-2. That is, by flowing air through the pipes 17-1 and 17-2 and the throttles of the electromagnetic valves 15-1 and 15-2, the vibration is attenuated by the loss at that time. In the low frequency region, such a vibration damping effect is large, and the resonance magnification of the entire air cushion 11 as a spring is also reduced.
[0065]
On the other hand, in order to improve cushioning properties and vibration damping characteristics, a difference in hardness (spring constant) is provided between the air cushion 11 and the left and right air pads 13-1 and 13-2. Air pads 13-1 and 13-2 are harder.
[0066]
However, since air is appropriately circulated between the air cushion 11 and the left and right air pads 13-1 and 13-2 as described above, the air cushion 11 and the left and right air pads 13-1 and 13-2 are in a steady state. Since the internal pressures of the springs are equal to each other, no difference can be made in the spring hardness due to air pressure.
[0067]
Therefore, the elastic films forming the air pads 13-1 and 13-2 are configured to have a lower elasticity against the internal air pressure than the elastic films forming the air cushion 11.
[0068]
For this purpose, as described in the first embodiment, the elasticity of the rubber or resin material itself is made different from each other, or the thickness of the film, the material type, the diameter, the driving density, etc. of the reinforcing fiber are set. Shall be different from each other.
[0069]
On the other hand, when the vibration acting on the vehicle seat 1 is in a high frequency region (for example, 4 Hz or more), the left and right electromagnetic valves 15-1 and 15-2 are completely closed or set to a state close to this. As a result, the resonance magnification of the air cushion 11 decreases. Further, when it is in an intermediate region between the low frequency region and the high frequency region (for example, 3 to 4 Hz), the degree of throttle of the electromagnetic valve 15 is appropriately adjusted to keep the resonance magnification small.
[0070]
In addition, during travel of the vehicle, the degree of throttle or the degree of opening and closing of the electromagnetic valves 15-1 and 15-2 is multiplied by a vibration frequency or the like received by the vehicle seat, and is adjusted in real time so as to be in an optimum state for vibration isolation and reduction of resonance magnification. Is adjusted as appropriate.
[0071]
On the other hand, as described above, the left and right air pads 13-1 and 13-2 are provided more rigidly as springs than the air cushion 11 below the occupant. That is, the region (buttock support region 2a) that directly supports the load from the occupant is supported by the frame 3 via the soft air cushion, but the side portion 23 that suspends the buttocks support region 2a from the left and right is more It is supported from the frame 3 via a hard air pad. Thereby, the cushioning property when the occupant is seated is kept high, and the vibration proof and the vibration insulation are well performed.
[0072]
In the above embodiment, the elastic film forming the air cushion 11 or the air pad 13 may be made of a general rubber material as long as it has appropriate elasticity, vibration absorption and durability. Even those made of a plastic elastomer or the like can be used similarly. For example, natural rubber (NR), chloroprene rubber (CR), urethane rubber, or the like can be used. The air cushion 11 and the air pad 13 may be formed by laminating an elastic fabric, or by impregnating the fabric with an elastomer material and solidifying it.
[0073]
In the above embodiment, the thigh support region 2b is described as being directly mounted on the plate-shaped frame 3. However, an air bag serving as an air cushion may be provided in this region as well. At this time, if the air bladder below the thigh support region 2b is provided separately from the air bladder below the buttocks support region 2a, only the air bladder in the buttocks support region 2a rapidly contracts during a vehicle collision. Therefore, it is possible to prevent the occupant from slipping down.
[0074]
Further, the first embodiment and the second embodiment may be combined. That is, the air cushion 11 in the buttocks support region is composed of upper and lower air bladders 11-1 and 11-2, and air pads 13-1 and 13-2 are provided on the left and right side portions. The communication may be possible.
[0075]
It is preferable that the degree of throttle or the degree of opening and closing of the electromagnetic valve 15 be continuously changed in accordance with the vibration frequency range received by the vehicle seat so as to be in an optimum state for reducing the vibration magnification. However, depending on the case, when the peak value of the vibration frequency reaches a predetermined value, switching between the fully open state and the completely closed state may be performed.
[0076]
In the above-described embodiment, the emergency exhaust solenoid valve 16 for releasing the air pressure of the air cushion 11 when abnormal acceleration is detected is provided. Alternatively, the drop mechanism may be omitted.
[0077]
Further, although the air bag forming the air cushion or the air pad is described as being made of an elastic film, it may be made of an inelastic film in some cases.
[0078]
On the other hand, in the above embodiment, it has been described that one continuous groove 21 and 22 are provided on the upper and lower surfaces of the cushion pad 2, respectively. Depending on the case, several units may be provided.
[0079]
【The invention's effect】
The ride comfort can be improved by optimizing the anti-vibration characteristics according to the vehicle running state, the vibration frequency, and the like.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional side view schematically illustrating a normal state of a vehicle seat according to a first embodiment.
FIG. 2 is a partial cross-sectional side view corresponding to FIG. 1, schematically showing a state of the vehicle seat of Example 1 when receiving an abnormal acceleration.
FIG. 3 is a cross-sectional perspective view schematically illustrating a seat cushion pad used for the vehicle seat according to the first embodiment.
FIG. 4 is a left-right vertical sectional view schematically showing a pretension effect by a seat belt in the vehicle seat according to the embodiment.
FIG. 5 is a cross-sectional view in a left-right direction for schematically explaining a main part of a vehicle seat according to a second embodiment.
FIG. 6 is a cross-sectional perspective cutaway view in the front-rear direction for schematically explaining a main part of a vehicle seat according to a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vehicle seat 11 Air cushions 11-1 and 11-2 Upper and lower air bags 13-1 and 13-2 which form an air cushion Left and right air pads 15 Electromagnetic valve 16 Emergency exhaust electromagnetic valve 2 Cushion pad 2a Buttocks support area 23 Side Part 24 concave part 3 on lower surface of side part plate-shaped frame 3a concave part 4 for storing air cushion Seat belt (with pretension mechanism)
5 Backrest

Claims (7)

In a vehicle seat including a cushion pad supporting an occupant's buttocks and thighs, and a frame supporting the cushion pad from below,
A plurality of air bladders for elastically supporting the cushion pad from the frame in at least a partial area are provided,
These air bags are communicated with each other via a variable throttle valve or an on-off valve,
A seating state of the occupant, a running state of the vehicle, or, based on the frequency distribution or intensity of vibration received by the cushion pad, adjusts the degree of throttle of the variable throttle valve or opens and closes the on-off valve, thereby forming a set. A vehicle seat, comprising: a mechanism for adjusting vibration isolation characteristics of the air bag. 2. The vehicle seat according to claim 1, wherein the plurality of air bags are vertically arranged below an occupant seating portion of the cushion pad. 3. 2. The vehicle seat according to claim 1, wherein the plurality of air bladders are arranged below a seating portion of the occupant on the cushion pad and below or inside left and right side portions, respectively. 3. The vehicle seat according to any one of claims 1 to 3, wherein the plurality of air bladders are made of an elastic material, and have different elastic coefficients against an internal air pressure. At least one of the plurality of air bladders is arranged corresponding to an area for supporting a passenger's buttocks,
This air bag is provided with an internal pressure release valve for releasing the internal air pressure,
5. A mechanism for operating the internal pressure release valve when an abnormal acceleration is detected, thereby contracting the air bladder to thereby depress the buttocks support area of the cushion pad. A vehicle seat according to any one of the above. The vehicle seat according to claim 5, wherein a groove or a cut is provided on a surface of the cushion pad along a boundary between the buttocks support region and a region in front of the buttocks support region. A seat belt that holds the occupant's waist or thigh is provided, and the seat belt is provided with a mechanism that increases the tension of the seat belt when abnormal acceleration is detected,
7. The vehicle seat according to claim 5, wherein upper ends of left and right fastening portions supporting the seat belt are positioned lower than upper surfaces of side portions of the cushion pad. 8.

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